CN105126536B - Purifying device for natural gas, purification system, processing system and adsorbent regeneration method - Google Patents
Purifying device for natural gas, purification system, processing system and adsorbent regeneration method Download PDFInfo
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- CN105126536B CN105126536B CN201510485288.0A CN201510485288A CN105126536B CN 105126536 B CN105126536 B CN 105126536B CN 201510485288 A CN201510485288 A CN 201510485288A CN 105126536 B CN105126536 B CN 105126536B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 202
- 239000003345 natural gas Substances 0.000 title claims abstract description 101
- 238000000746 purification Methods 0.000 title claims abstract description 49
- 239000003463 adsorbent Substances 0.000 title claims abstract description 29
- 238000011069 regeneration method Methods 0.000 title claims abstract description 28
- 238000001179 sorption measurement Methods 0.000 claims abstract description 289
- 239000007789 gas Substances 0.000 claims abstract description 152
- 238000007664 blowing Methods 0.000 claims abstract description 151
- 238000005265 energy consumption Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 105
- 230000008569 process Effects 0.000 claims description 91
- 238000010438 heat treatment Methods 0.000 claims description 23
- 230000008929 regeneration Effects 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 13
- 230000001172 regenerating effect Effects 0.000 claims description 10
- 239000000446 fuel Substances 0.000 claims description 9
- 230000000630 rising effect Effects 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 6
- 239000012535 impurity Substances 0.000 description 13
- 239000002253 acid Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 230000002035 prolonged effect Effects 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- 239000002699 waste material Substances 0.000 description 6
- 238000003795 desorption Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005057 refrigeration Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 239000003949 liquefied natural gas Substances 0.000 description 3
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 3
- 229910052753 mercury Inorganic materials 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000010792 warming Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- -1 natural gas form hydrates Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- Separation Of Gases By Adsorption (AREA)
Abstract
The present invention provides a kind of purifying device for natural gas, purification system, processing system and adsorbent regeneration methods.Wherein, the purifying device for natural gas includes the first adsorption tower, the second adsorption tower, preheating apparatus and heat riser, the entrance of preheating apparatus with cold air source for being connected, receive the cold air that cold air source provides, the outlet of preheating apparatus is connected with the cold blowing workshop section entrance of the first adsorption tower, the cold blowing workshop section outlet of first adsorption tower is connected by heat riser with the hot blow workshop section entrance of the second adsorption tower, and the hot blow workshop section outlet of the second adsorption tower is for exporting the gas in the second adsorption tower.The heat of the gas of the cold blowing workshop section outlet output of first adsorption tower is utilized again, realizes and the energy is efficiently used, greatly increase the utilization rate of the energy; and reduce the energy consumption of heat riser; the energy is further saved, in addition, being also effectively protected the first adsorption tower.
Description
Technical Field
The invention relates to the technical field of natural gas treatment, in particular to a natural gas purification device, a natural gas purification system, a natural gas treatment system and an adsorbent regeneration method.
Background
The natural gas is a clean energy and chemical raw material, a natural gas long-distance pipeline in China conveys the natural gas to each natural gas valve station in a high-pressure gas conveying mode, and the natural gas is conveyed into a downstream pipe network after being subjected to pressure reduction treatment or is liquefied into liquefied natural gas for users to use.
Generally, a raw gas from a natural gas station contains impurities such as water, mercury, and acid gas, and each impurity has a serious influence on a system for depressurizing natural gas. For example, the water content in the natural gas and the natural gas form hydrates under certain conditions to block pipelines, which affects the cooling liquefaction process; acid gas in natural gas can form acid in free water, thus eroding pipelines and equipment; mercury is very corrosive to aluminum equipment and pipes; in addition, unnecessary power consumption is caused due to the existence of moisture; because of the low natural gas liquefaction temperature, the presence of water and acid gases can also lead to freeze-plugging of the equipment and must be removed.
In order to solve the problem, the common mode at present is to purify the raw material gas of each natural gas valve station by a purification system before the natural gas is depressurized. At present, a plurality of purification units are generally arranged in a purification system, each purification unit is internally provided with a plurality of adsorption towers, each adsorption tower is filled with an adsorbent to selectively remove impurities such as acid gas, mercury, water and the like in raw natural gas, and the plurality of towers can simultaneously carry out adsorption and regeneration (desorption) cycle operation. A frequently used Adsorption method is TSA (Temperature Swing Adsorption). The TSA adsorption mode is that natural gas entering from the bottom of a tower adsorbs impurities such as acid gas, water and the like in the gas under the action of an adsorbent in the tower, and after adsorption is finished, high-temperature desorption gas is used for regeneration, namely the adsorbent is used for adsorbing the impurities such as water, acid gas and the like at normal temperature or low temperature, and then the adsorbent is subjected to desorption regeneration at high temperature to form a regeneration cycle of the adsorbent, so that the purposes of continuous separation and gas purification are achieved.
Generally speaking, TSA temperature swing adsorption includes three sections of adsorption, hot blowing and cold blowing, and a plurality of valves are arranged on an adsorption tower, and the switching of each valve is used to realize the air intake of the adsorption, hot blowing and cold blowing processes, specifically: opening a valve corresponding to an adsorption process, allowing high-pressure natural gas to enter an adsorption tower, adsorbing impurities such as acid gas in the gas under the action of an adsorbent in the tower, closing the valve corresponding to the adsorption process after adsorption is finished, opening the valve corresponding to a hot blowing process, inputting high-temperature gas, desorbing impurities such as water and the acid gas adsorbed by the adsorbent by using the high-temperature desorption gas, closing the valve corresponding to the hot blowing process after hot blowing is finished, opening the valve corresponding to a cold blowing process, conveying cold blowing gas into the adsorption tower, and cooling the adsorption tower. When the temperature of the adsorption tower is reduced to a preset temperature value, the cold blowing is finished and then the adsorption process is carried out, thus forming the cycle of adsorption and regeneration of the adsorbent and achieving the purpose of continuously separating and purifying gas. The PSA pressure swing adsorption comprises two working sections of adsorption and hot blowing, and the working processes of the two working sections are the same as those of the adsorption working section and the hot blowing working section in the TSA temperature swing adsorption, but the cold blowing working section in the TSA temperature swing adsorption is omitted.
Generally, in the cold blowing process of TSA temperature swing adsorption, cold blown gas is introduced into an adsorption tower for heat exchange, so that the temperature of the adsorption tower is reduced, and the corresponding temperature of the cold blown gas is increased and is output by the adsorption tower. The output cold blowing air with increased temperature is directly input into a natural gas pipe network, and the heat of the cold blowing air is not fully utilized, so that the energy waste is caused. In addition, high-temperature gas needs to be introduced into the adsorption tower in the hot blowing process, low-temperature gas in the natural gas treatment system is generally heated to a preset temperature through a heating device and then is input into the adsorption tower, and because the gas temperature is low, more energy needs to be consumed to heat the gas to form high-temperature gas, which inevitably causes energy waste.
Disclosure of Invention
In view of this, the invention provides a natural gas purification device, a purification system, a treatment system and an adsorbent regeneration method, and aims to solve the problem that the heat of the gas output by the cold blowing process cannot be fully utilized, so that energy is wasted.
In one aspect, the present invention provides a natural gas purification apparatus, comprising: the device comprises a first adsorption tower, a second adsorption tower, a preheating device and a heating device; the inlet of the preheating device is used for being connected with a cold air source and receiving cold air provided by the cold air source; the outlet of the preheating device is connected with the inlet of the cold blowing section of the first adsorption tower, and the outlet of the cold blowing section of the first adsorption tower is connected with the inlet of the hot blowing section of the second adsorption tower through the heating device; and the outlet of the hot blowing section of the second adsorption tower is used for outputting the gas in the second adsorption tower.
Further, in the natural gas purification apparatus, the temperature raising device is a heater.
Further, the natural gas purification apparatus further includes: a first control valve and a second control valve; wherein, the cold air source is connected with the inlet of the cold blowing section of the first adsorption tower through a first control valve and a preheating device in sequence; the cold air source is also connected with the inlet of the cold blowing section of the first adsorption tower through a second control valve, and the pipeline where the first control valve and the preheating device are located and the pipeline where the second control valve is located form a parallel pipeline.
Further, in the above natural gas purification apparatus, the preheating device is a first heat exchanger.
Further, the natural gas purification apparatus further includes: a third adsorption tower and a compressor; wherein, the inlet of the adsorption section of the third adsorption tower is used for introducing raw material natural gas into the third adsorption tower; an outlet of an adsorption section of the third adsorption tower is connected with an inlet of a first channel of the first heat exchanger through a compressor, and an outlet of the first channel of the first heat exchanger is used for outputting gas; and the cold air source is connected with the inlet of the second channel of the first heat exchanger through the first control valve, and the outlet of the second channel of the first heat exchanger is connected with the inlet of the cold blowing section of the first adsorption tower.
Further, the natural gas purification apparatus further includes: a second heat exchanger; the inlet of the first channel of the second heat exchanger is connected with the outlet of the first channel of the first heat exchanger, and the outlet of the first channel of the second heat exchanger is used for outputting gas; an inlet of the second channel of the second heat exchanger is used for receiving flash steam; the outlet of the second channel of the second heat exchanger is connected with the fuel inlet of the temperature rising device and used for providing fuel for the temperature rising device; the outlet of the second channel of the second heat exchanger is also used for outputting flash steam.
In another aspect, the invention provides a natural gas purification system comprising at least one natural gas purification device as described above.
In yet another aspect, the present invention provides a natural gas processing system comprising the natural gas purification system described above.
In another aspect, the present invention provides a method for regenerating an adsorbent in an adsorption tower, comprising the steps of: a temperature difference determination step of determining a temperature difference between gas output from the adsorption tower and gas input from the cold blowing step; a first execution step, when the temperature difference is larger than a preset value, firstly carrying out heat exchange and temperature rise on cold air used for cooling the adsorption tower in the cold blowing process and gas output by the adsorption tower in the adsorption process, and then inputting the gas subjected to heat exchange and temperature rise into the adsorption tower in the cold blowing process as cold blowing gas; and a regeneration step, namely heating the gas output by the adsorption tower in the cold blowing process to a preset temperature, and inputting the heated gas into the adsorption tower in the hot blowing process to be used as regenerated gas.
Further, in the above method for regenerating an adsorbent in an adsorption column, the step of determining a temperature difference and the step of regenerating further include: and a second execution step of directly inputting cold air into the adsorption tower in the cold blowing process as cold blowing air when the temperature difference is less than or equal to a preset value.
According to the invention, the gas with higher temperature output from the outlet of the cold blowing section of the first adsorption tower is heated by the heating device and then is introduced into the second adsorption tower as the regeneration gas, so that the problem of energy waste caused by the fact that the cold blowing gas with increased temperature output from the outlet of the cold blowing section of the adsorption tower is directly input into a natural gas pipe network in the prior art is solved, the effective utilization of energy is realized, and the utilization rate of the energy is greatly improved; compared with the prior art that the low-temperature gas in the natural gas treatment system is heated to be used as the regeneration gas, the temperature of the gas output by the first adsorption tower is higher than that of the low-pressure low-temperature gas in the prior art, so that the energy consumed by the temperature raising device is low, and the energy can be further saved; in addition, the cold air is preheated and warmed up before being input into the first adsorption tower, on one hand, the cold air has certain temperature after being preheated and warmed up, and is input into the warming device after the heat exchange of the first adsorption tower, so that the energy consumption of the warming device is reduced, on the other hand, the damage of the first adsorption tower caused by the direct contact of the cold air with lower temperature and the first adsorption tower with higher temperature is avoided, the first adsorption tower is effectively protected, and the service life of the first adsorption tower is prolonged.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic structural diagram of a purification apparatus provided in an embodiment of the present invention;
FIG. 2 is a flow chart of a method for regenerating an adsorbent in an adsorption tower according to an embodiment of the present invention;
fig. 3 is another flow chart of the method for regenerating the adsorbent in the adsorption tower according to the embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As will be understood by those skilled in the art, for the TSA temperature swing adsorption method, including an adsorption section, a hot-blowing section and a cold-blowing section, correspondingly, an adsorption section inlet for inputting gas to the adsorption section, and an adsorption section outlet for outputting gas in the adsorption section should be provided on the adsorption tower; the adsorption tower is also provided with a hot blowing section inlet for inputting gas to the hot blowing section and a hot blowing section outlet for outputting the gas in the hot blowing section; the adsorption tower is also provided with a cold blowing section inlet for inputting gas to the cold blowing section and a cold blowing section outlet for outputting the gas in the cold blowing section. For the PSA pressure swing adsorption method, only an adsorption section and a hot blowing section are included, and correspondingly, an adsorption section inlet and an adsorption section outlet are also arranged on the adsorption tower; the adsorption tower is also provided with a hot blowing section inlet and a hot blowing section outlet.
Example of the purification apparatus:
referring to fig. 1, fig. 1 is a schematic structural diagram of a purification apparatus according to an embodiment of the present invention. As shown in the figure, the purification apparatus includes a first adsorption tower 1, a second adsorption tower 3, a preheating device, and a temperature raising device 2.
Wherein, the inlet of the preheating device is used for connecting with the cold air source 4 and receiving the cold air provided by the cold air source 4. The outlet of the preheating device is connected with the inlet 11 of the cold blowing section of the first adsorption tower, and the outlet 12 of the cold blowing section of the first adsorption tower is connected with the inlet 31 of the hot blowing section of the second adsorption tower through the temperature raising device 2. The hot-blowing section outlet 32 of the second adsorption tower is used for outputting the gas in the second adsorption tower 3.
It should be noted that, in the specific implementation, the preheating device may be a heater or a heat exchanger, or may be other devices known to those skilled in the art that can achieve the purpose of heating and raising temperature, and this embodiment does not limit the devices at all. The temperature raising device 2 may be a heater, a heat conducting oil furnace, a tube furnace, or the like, and may also be other devices known to those skilled in the art that can achieve the purpose of heating, and this embodiment does not limit the devices at all.
In this embodiment, the cold air source 4 may be any cold air source, but in order to make full use of energy, and avoid waste of energy, the refrigeration gas generated in the natural gas processing system may be used as the cold air of the cold air source, and is introduced into the first adsorption tower 1 to cool the first adsorption tower 1, and the refrigeration gas generated in the natural gas processing system is used as the cold air of the cold air source, on one hand, the refrigeration gas generated in the natural gas processing system has been subjected to purification treatment, and the refrigeration gas without impurities is introduced into the first adsorption tower 1 and the second adsorption tower 3, so that the first adsorption tower 1 and the second adsorption tower 3 are effectively protected, corrosion of the first adsorption tower and the second adsorption tower caused by chemical reactions between the impurities in the refrigeration gas and the first adsorption tower 1 and the second adsorption tower 3 is avoided, and the service lives of the first adsorption tower and the second adsorption tower are prolonged. On the other hand, the refrigerant gas can be directly introduced into the first adsorption tower 1 and the second adsorption tower 3 after being subjected to pressure reduction treatment, and the refrigerant gas does not need to be subjected to pressure reduction treatment before being introduced into the first adsorption tower 1 and the second adsorption tower 3, so that the process steps are simplified, and the pressure reduction cost is saved.
It should be understood by those skilled in the art that the natural gas processing system in this embodiment is configured to purify and cool the high-pressure natural gas from the gate station, the purified and cooled natural gas enters the liquefaction system, one path of the purified and cooled natural gas is depressurized and heated by the expander and the heat exchanger and then output to the natural gas pipe network, the other path of the purified and cooled natural gas is liquefied into the liquefied natural gas, and the flash steam generated by the liquefied natural gas is output to the natural gas pipe network after passing through the heat exchanger.
The working process of the embodiment: the cold air provided by the cold air source 4 enters the preheating device through the inlet of the preheating device, and the preheating device preheats the cold air so that the cold air has a certain temperature. The preheated cold air enters the first adsorption tower 1 through a cold blowing section inlet 11 of the first adsorption tower. In the first adsorption tower 1, the preheated cold air exchanges heat with the adsorbent in the temperature-to-be-reduced state after the hot blowing process, and the adsorbent is cooled, that is, the first adsorption tower 1 is cooled. The temperature of the high temperature of the first adsorption tower 1 is gradually reduced after heat exchange, and the temperature of the preheated cold air is increased after heat exchange and is output from a cold blowing section outlet 12 of the first adsorption tower. The output cold air with the increased temperature enters the temperature raising device 2, the temperature raising device 2 heats the input cold air with the increased temperature to a preset temperature, and the cold air is input into the second adsorption tower 3 to be used as the regeneration gas of the hot blowing process of the second adsorption tower 3. In the second adsorption tower 3, the regenerated gas interacts with the adsorbent which is in a state of waiting for analysis after adsorbing impurities, the impurities adsorbed by the adsorbent are analyzed out, and then the desorbed regenerated gas is output to a natural gas pipeline network through a hot blowing section outlet 32 of the second adsorption tower for users to use.
It should be noted that although the temperature of the cold air is increased after the cold air is preheated, the temperature of the first adsorption tower 1 itself after the hot blowing process is much higher than that of the preheated cold air, so that the purpose of cooling the first adsorption tower 1 can still be achieved by introducing the preheated cold air into the first adsorption tower 1.
It should be noted that, in a specific implementation, the preset temperature may be determined according to an actual situation, and this embodiment does not limit this.
It can be seen that in the embodiment, the gas with higher temperature output from the outlet 12 of the cold blowing section of the first adsorption tower is heated by the heating device 2 and then is introduced into the second adsorption tower 3 as the regeneration gas, so that the problem of energy waste caused by the fact that the cold blowing gas with increased temperature output from the outlet of the cold blowing section of the adsorption tower in the prior art is directly input into a natural gas pipe network is solved, the effective utilization of energy is realized, and the utilization rate of energy is greatly improved; in addition, compared with the prior art that the low-temperature gas in the natural gas treatment system is heated as the regeneration gas, the temperature of the gas output by the first adsorption tower in the embodiment is higher than that of the low-pressure low-temperature gas in the prior art, so that the energy consumed by the temperature raising device 2 in the embodiment is low, and the energy can be further saved; in addition, the preheating and the temperature rising are carried out before the cold air is input into the first adsorption tower 1, on one hand, the cold air has a certain temperature after the preheating and the temperature rising, and the cold air is input into the temperature rising device 2 after the heat exchange of the first adsorption tower 1, so that the energy consumption of the temperature rising device is reduced, on the other hand, the damage of the first adsorption tower caused by the direct contact of the cold air with a lower temperature and the first adsorption tower 1 with a higher temperature is avoided, the first adsorption tower 1 is effectively protected, and the service life of the first adsorption tower is prolonged.
Referring to fig. 1, the above embodiment may further include a first control valve 5 and a second control valve 6. Wherein, the cold air source 4 is connected with the cold blowing section inlet 11 of the first adsorption tower through the first control valve 5 and the preheating device in sequence. Specifically, the cold air source 4 is connected to an inlet of the preheating device through the first control valve 5, and an outlet of the preheating device is connected to the cold blowing section inlet 11 of the first adsorption tower.
The cold air source 4 is further connected with a cold blowing section inlet 11 of the first adsorption tower through a second control valve 6, and a pipeline where the first control valve 5 and the preheating device are located and a pipeline where the second control valve 6 is located form a parallel pipeline, that is, the air output by the cold air source 4 can be input into the first adsorption tower 1 through the first control valve 5 and the preheating device in sequence, or can be input into the first adsorption tower 1 through the second control valve 6.
It should be noted that the first control valve 5 and the second control valve 6 may be electromagnetic valves, pilot-controlled valves, etc., or other devices known to those skilled in the art that can control the on/off of the pipeline, and this embodiment is not limited in any way.
The working process of the embodiment: the preheated cold air is introduced into the first adsorption tower 1 to cool the first adsorption tower 1, and the temperature of the preheated cold air is continuously increased correspondingly, that is, the temperature of the gas output by the first adsorption tower 1 is higher. When the difference value between the temperature of the input gas and the temperature of the output gas of the first adsorption tower is greater than the preset value, the first control valve 5 is opened, the second control valve 6 is closed, the cold gas of the cold gas source 4 is input into the preheating device through the first control valve 5 for preheating and temperature rise, the preheated cold gas is introduced into the first adsorption tower, and the working process in the embodiment is repeated. As the cold blowing step proceeds, the temperature in the first adsorption tower 1 gradually decreases, that is, the temperature of the gas output from the first adsorption tower 1 gradually decreases. When the difference value between the temperature of the input gas and the temperature of the output gas of the first adsorption tower is smaller than or equal to a preset value, the first control valve 5 is closed, the second control valve 6 is opened, the cold air of the cold air source 4 directly enters the first adsorption tower 1 through the cold-blowing section inlet 11 of the first adsorption tower to exchange heat with the first adsorption tower 1, the cold air cools and reduces the temperature of the first adsorption tower 1, the temperature of the cold air is increased after heat exchange, and the cold air is output to the temperature increasing device 2 through the cold-blowing section outlet 12 of the first adsorption tower to be heated and increased in temperature to serve as regeneration gas. The regenerated gas is used for blowing hot to the adsorbent in the second adsorption tower 3, impurities adsorbed by the adsorbent are resolved out, and the desorbed regenerated gas is output to a natural gas pipeline network for users to use. With the gradual decrease of the temperature of the first adsorption tower, when the temperature of the gas output by the first adsorption tower 1 is reduced to a preset low temperature, the cold blowing process of the first adsorption tower is completed, and the next cycle of adsorption process can be performed.
It should be noted that, as the temperature of the first adsorption tower is gradually decreased, the cold gas introduced into the first adsorption tower 1 has no cooling effect on the first adsorption tower 1, so that the temperature difference between the gas input to the first adsorption tower 1 and the gas output therefrom should be greater than or equal to zero.
In specific implementation, the temperature of the gas input at the inlet 11 of the cold-blowing section of the first adsorption tower and the temperature of the gas output at the outlet 12 of the cold-blowing section of the first adsorption tower can be detected by temperature detecting instruments installed at the inlet of the cold-blowing section and the outlet of the cold-blowing section of the first adsorption tower.
In specific implementation, the temperature detection instrument can be linked with the first control valve 5 and the second control valve 6 in a program control mode. The temperature detecting instrument detects the temperature value, calculates the difference value between the temperature value and the preset value, compares the temperature difference with the preset value, and opens the first control valve 5 and closes the second control valve 6 when the temperature difference is larger than the preset value; and when the temperature difference is smaller than or equal to the preset value, closing the first control valve 5 and opening the second control valve 6.
It should be noted that, in specific implementation, the preset value and the preset low temperature may be determined according to actual situations, and this embodiment does not limit this.
It can be seen that, in this embodiment, along with the going on of cold blowing process, the temperature in first adsorption tower 1 reduces gradually, and then the temperature of the gas of first adsorption tower 1 output also reduces gradually, directly lets in first adsorption tower 1 with the cold air of cold air source 4 for the quick cooling of first adsorption tower 1, the make full use of energy avoids the loss of the energy.
Referring to fig. 1, in the present embodiment, the preheating device may be the first heat exchanger 7, and then the embodiment may further include a third adsorption tower 8 and a compressor 9. Wherein, the adsorption section inlet 81 of the third adsorption tower is used for introducing the raw material natural gas into the third adsorption tower 8. The outlet 82 of the adsorption section of the third adsorption tower is connected with the inlet 71 of the first channel of the first heat exchanger through the compressor 9, the outlet 72 of the first channel of the first heat exchanger is used for outputting gas, and the outputted gas enters the liquefaction system. The cold air source 4 is connected with the inlet 73 of the second channel of the first heat exchanger through the first control valve 5, and the outlet 74 of the second channel of the first heat exchanger is connected with the inlet 11 of the cold blowing section of the first adsorption tower.
The working process of the embodiment: when the difference value between the temperature of the input gas and the temperature of the output gas of the first adsorption tower 1 is greater than the preset value, the cold air of the cold air source 4 enters a second channel of the first heat exchanger 7 through the first control valve 5 to wait for heat exchange and temperature rise. The raw material natural gas enters from the bottom of the third adsorption tower 8 and interacts with the adsorbent in the third adsorption tower 8, impurities in the raw material natural gas are adsorbed by the adsorbent, the purified natural gas enters the compressor 9 to be compressed, and the temperature of the purified natural gas rises. The purified natural gas with the increased temperature enters the first channel of the first heat exchanger 7 to wait for heat exchange and temperature reduction. Therefore, the cold air in the second channel of the first heat exchanger 7 exchanges heat with the purified natural gas with the increased temperature in the first channel, so that the temperature of the cold air in the second channel is increased, and then the cold air enters the first adsorption tower 1 to cool the first adsorption tower 1; the temperature of the purified natural gas in the first pass is reduced and output through the outlet 72 of the first pass of the first heat exchanger.
It can be seen that, in this embodiment, the cold air in the cold air source 4 exchanges heat with the purified natural gas output by the third adsorption tower 8 and having a raised temperature after passing through the compressor 9, so that the preheating and warming of the cold air and the cooling of the purified natural gas are realized, and the utilization rate of energy is improved.
Referring to fig. 1, the above embodiment may further include a second heat exchanger 10. Wherein, the inlet 101 of the first channel of the second heat exchanger is connected with the outlet 72 of the first channel of the first heat exchanger, and the outlet 102 of the first channel of the second heat exchanger is used for outputting the gas, and the outputted gas enters the liquefaction system. An inlet 103 of the second channel of the second heat exchanger is used for receiving flash steam, namely BOG gas, an outlet 104 of the second channel of the second heat exchanger is connected with the fuel inlet of the temperature increasing device 2 and used for providing fuel for the temperature increasing device 2, and the outlet 104 of the second channel of the second heat exchanger is also used for outputting the flash steam to a natural gas pipeline network.
It should be noted that, as will be understood by those skilled in the art, in the process of outputting the flash steam after heat exchange by the second heat exchanger 10 to the natural gas pipe network, the flash steam may also be correspondingly processed by a series of other corresponding devices such as a compressor and then input to the natural gas pipe network for users to use.
The working process of the embodiment: the purified natural gas output from the outlet 72 of the first channel of the first heat exchanger enters the second heat exchanger 10 through the inlet 101 of the first channel of the second heat exchanger, and waits for heat exchange and temperature reduction. The flash steam is low-temperature and low-pressure gas, enters the second heat exchanger 10 through the inlet 103 of the second channel of the second heat exchanger, and waits for heat exchange and temperature rise. Therefore, the purified natural gas in the first channel of the second heat exchanger 10 exchanges heat with the flash steam in the second channel of the second heat exchanger 10, so that the temperature of the purified natural gas in the first channel is reduced, and the purified natural gas is output through the outlet 102 of the first channel of the second heat exchanger; and the temperature of the flash steam in the second channel is correspondingly increased. The flash steam with the increased temperature is output in two paths, and one path of the flash steam enters the heating device 2 through the fuel inlet of the heating device 2 and is used as the fuel of the heating device; and the other path is output to a natural gas pipeline network for users to use.
In this embodiment, the flash steam exchanges heat with the purified natural gas output by the first channel in the first heat exchanger 7 in the second heat exchanger 10, so that the purified natural gas can be cooled better before entering the liquefaction system, and the utilization rate of energy is further improved; and, a part of flash steam after heat exchange is provided to the temperature raising device 2 as fuel for combustion, thereby further fully utilizing energy.
In the above embodiment, the switching of each process in each adsorption tower and the switching between the adsorption towers can be controlled by a program control valve. The connections described in the above embodiments are all connected by piping.
In summary, in the embodiment, the gas with a certain temperature generated after the heat exchange in the first adsorption tower is heated and heated, and is introduced into the second adsorption tower for hot blowing analysis, so that not only is the heat of the gas output by the first adsorption tower fully utilized, but also the energy is effectively utilized, the energy utilization rate is improved, and the purpose of energy saving is achieved, and in addition, the gas output by the first adsorption tower is introduced into the heating device, the introduced gas has a certain amount of heat, the air inlet enthalpy value of the heating device is improved, the energy consumption of the heating device is also reduced, and further the working efficiency of the heating device is improved; in addition, the cold air of the cold air source is preheated and then enters the first adsorption tower, on one hand, the cold air has a certain temperature after being preheated and heated, and then enters the heating device after being subjected to heat exchange of the first adsorption tower, so that the energy consumption of the heating device is reduced, on the other hand, the damage of the first adsorption tower caused by direct contact between the cold air with a lower temperature and the first adsorption tower with a higher temperature is avoided, the first adsorption tower is effectively protected, and the service life of the first adsorption tower is prolonged.
Purification system embodiment:
the invention also provides a natural gas purification system, which comprises at least one natural gas purification device. The specific implementation process of the natural gas purification device can be referred to the above description, and the detailed description of the embodiment is omitted here.
Since the natural gas purification device has the above effects, the purification system having the natural gas purification device also has corresponding technical effects.
The embodiment of the processing system comprises:
the invention also provides a natural gas treatment system which comprises the natural gas purification system. The specific implementation process of the natural gas purification system can be referred to the above description, and the detailed description of this embodiment is omitted here.
Since the natural gas purification system has the above effects, the natural gas treatment system having the natural gas purification system also has corresponding technical effects.
Example of the regeneration method:
referring to fig. 2, fig. 2 is a flow chart illustrating a method for regenerating an adsorbent in an adsorption tower according to an embodiment of the present invention. As shown, the method comprises the following steps:
the temperature difference determining step S1 determines the temperature difference between the gas output from the adsorption tower and the gas input thereto in the cold blowing step. Specifically, the temperature of the gas input at the inlet and the temperature of the gas output at the outlet of the adsorption tower in the cold blowing process may be detected by temperature detection instruments.
The first step S2 is executed, when the temperature difference is greater than the preset value, the cold air used for cooling the adsorption tower in the cold blowing process exchanges heat with the gas output by the adsorption tower in the adsorption process to raise the temperature, and then the gas after heat exchange and temperature rise is input into the adsorption tower in the cold blowing process as cold blowing gas.
In this embodiment, the adsorption tower in the cold blowing process and the adsorption tower in the adsorption process are associated with each other, and the cold air with a relatively low temperature is input to the heat exchanging device, such as a heat exchanger, and the purified natural gas with a relatively high temperature output by the adsorption tower in the adsorption process is also input to the heat exchanging device.
And a regeneration step S3, heating the gas output by the adsorption tower in the cold blowing process to a preset temperature, and inputting the heated gas into the adsorption tower in the hot blowing process to be used as a regeneration gas. Specifically, the gas output from the adsorption tower in the cold blowing process may be heated by the heating device, and in the specific implementation, the preset value and the preset temperature may be determined according to an actual situation, which is not limited in this embodiment.
In this embodiment, when the temperature difference is greater than the preset value, the temperature of the gas output by the adsorption tower in the cold blowing process is higher, the adsorption tower in the cold blowing process and the adsorption tower in the hot blowing process are connected in series, the temperature of the gas output by the adsorption tower in the cold blowing process is raised, the raised gas is used as regeneration gas, and is introduced into the adsorption tower in the hot blowing process to perform high-temperature desorption on the adsorption tower in the hot blowing process.
It can be seen that, in the embodiment, the gas with higher temperature output from the outlet of the adsorption tower in the cold blowing process is heated and then introduced into the adsorption tower in the hot blowing process as the regeneration gas, so that the problem of energy waste caused by the fact that the cold blowing gas with increased temperature output from the outlet of the cold blowing section of the adsorption tower is directly input into a natural gas pipe network in the prior art is solved, the effective utilization of energy is realized, the utilization rate of energy is greatly improved, and compared with the prior art that the low-temperature gas in a natural gas treatment system is heated as the regeneration gas, because the temperature of the gas output from the adsorption tower in the cold blowing process in the embodiment is higher than that of the low-pressure low-temperature gas in the prior art, the energy consumed when the gas output from the adsorption tower in the cold blowing process is heated in the embodiment is less, and the energy can be further saved; in addition, the cold air is preheated and heated before being input into the adsorption tower in the cold blowing process, so that the energy consumption of the gas output by the adsorption tower in the cold blowing process is further reduced, the damage of the adsorption tower in the cold blowing process caused by the direct contact of the cold air with lower temperature and the adsorption tower in the cold blowing process with higher temperature is avoided, the adsorption tower in the cold blowing process is effectively protected, and the service life of the adsorption tower in the cold blowing process is prolonged.
Referring to fig. 3, fig. 3 is another flow chart of the method for regenerating the adsorbent in the adsorption tower according to the embodiment of the present invention. As shown, the method comprises the following steps:
the temperature difference determining step S1 determines the temperature difference between the gas output from the adsorption tower and the gas input thereto in the cold blowing step.
The first step S2 is executed, when the temperature difference is greater than the preset value, the cold air used for cooling the adsorption tower in the cold blowing process exchanges heat with the gas output by the adsorption tower in the adsorption process to raise the temperature, and then the gas after heat exchange and temperature rise is input into the adsorption tower in the cold blowing process as cold blowing gas.
And a regeneration step S3, heating the gas output by the adsorption tower in the cold blowing process to a preset temperature, and inputting the heated gas into the adsorption tower in the hot blowing process to be used as a regeneration gas.
The specific implementation process of the steps S1, S2, and S3 may refer to the above description, and this embodiment is not described herein again.
After the temperature difference determining step S1 and before the regenerating step S3, further comprising: and a second step S4 of directly inputting cold air into the adsorption tower in the cold blowing process as cold blowing air when the temperature difference is less than or equal to the preset value. Specifically, the cold air source can also be directly connected with the inlet of the adsorption tower in the cold blowing process through a pipeline.
The first executing step S2 and the second executing step S4 have no sequence.
In this embodiment, when the temperature difference is less than or equal to the default, the temperature of the adsorption tower self that is in the cold blowing process reduces gradually, directly inputs cold air to the adsorption tower that is in the cold blowing process through the pipeline in, carries out the cooling of cooling down fast to the adsorption tower that is in the cold blowing process.
It should be noted that, as the temperature of the adsorption tower in the cold blowing process is gradually decreased, the cold air introduced into the adsorption tower in the cold blowing process does not lower the temperature of the adsorption tower in the cold blowing process, so that the temperature difference between the input gas and the output gas of the adsorption tower in the cold blowing process should be greater than or equal to zero.
It can be seen that in this embodiment, directly let in cold air in the adsorption tower that is in the cold blowing process to make the quick cooling of the adsorption tower that is in the cold blowing process, the make full use of energy avoids the loss of the energy.
In summary, in the embodiment, the gas with higher temperature output from the outlet of the adsorption tower in the cold blowing process is heated and then introduced into the adsorption tower in the hot blowing process as the regeneration gas, so that the effective utilization of energy is realized, and the utilization rate of the energy is greatly improved; when the gas input into the adsorption tower in the cold blowing process is preheated and then the gas output from the adsorption tower in the cold blowing process is heated, the gas temperature is high, so that the energy consumed during heating is low, and the energy can be further saved; in addition, cold air is preheated and then input to the adsorption tower in the cold blowing process, so that the damage of the adsorption tower in the cold blowing process caused by the fact that the cold air with lower temperature is in direct contact with the adsorption tower in the cold blowing process with higher temperature is avoided, the adsorption tower in the cold blowing process is effectively protected, and the service life of the adsorption tower in the cold blowing process is prolonged.
The principles of the adsorbent regeneration method in the adsorption tower, the natural gas purification apparatus, the natural gas purification system, and the natural gas treatment system according to the present invention are similar to each other, and the relevant points may be referred to each other.
The adsorption section and the hot-blowing section in this embodiment may be TSA temperature swing adsorption or PSA pressure swing adsorption, and the cold-blowing section may be TSA temperature swing adsorption only.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A natural gas purification apparatus, comprising: the device comprises a first adsorption tower (1), a second adsorption tower (3), a preheating device and a heating device (2); wherein,
the inlet of the preheating device is connected with a cold air source (4) and receives cold air provided by the cold air source;
the outlet of the preheating device is connected with the inlet (11) of the cold blowing section of the first adsorption tower, and the outlet (12) of the cold blowing section of the first adsorption tower is connected with the inlet (31) of the hot blowing section of the second adsorption tower through the temperature raising device (2);
a hot blowing section outlet (32) of the second adsorption tower is used for outputting gas in the second adsorption tower;
the preheating device is used for preheating the cold air so as to reduce the energy consumption of the temperature rising device (2) and protect the first adsorption tower (1).
2. A natural gas purification apparatus according to claim 1, wherein the temperature raising means (2) is a heater.
3. A natural gas purification apparatus according to claim 1 or 2, further comprising: a first control valve (5) and a second control valve (6); wherein,
the cold air source (4) is connected with a cold blowing section inlet (11) of the first adsorption tower sequentially through the first control valve (5) and the preheating device;
the cold air source (4) is also connected with a cold blowing section inlet (11) of the first adsorption tower through the second control valve (6), and a pipeline where the first control valve (5) and the preheating device are located and a pipeline where the second control valve (6) is located form a parallel pipeline.
4. A natural gas purification device according to claim 3, characterized in that the preheating device is a first heat exchanger (7).
5. The natural gas purification apparatus according to claim 4, further comprising: a third adsorption tower (8) and a compressor (9); wherein,
an adsorption section inlet (81) of the third adsorption tower is used for introducing raw material natural gas into the third adsorption tower;
an adsorption section outlet (82) of the third adsorption tower is connected with an inlet (71) of a first channel of the first heat exchanger through the compressor (9), and an outlet (72) of the first channel of the first heat exchanger is used for outputting gas; and the number of the first and second groups,
the cold air source (4) is connected with an inlet (73) of a second channel of the first heat exchanger through the first control valve (5), and an outlet (74) of the second channel of the first heat exchanger is connected with an inlet (11) of a cold blowing section of the first adsorption tower.
6. The natural gas purification apparatus according to claim 5, further comprising: a second heat exchanger (10); wherein,
the inlet (101) of the first channel of the second heat exchanger is connected with the outlet (72) of the first channel of the first heat exchanger, and the outlet (102) of the first channel of the second heat exchanger is used for outputting gas;
the inlet (103) of the second channel of the second heat exchanger is used for receiving flash steam;
an outlet (104) of the second channel of the second heat exchanger is connected with a fuel inlet of the temperature increasing device (2) and is used for supplying fuel to the temperature increasing device; the outlet (104) of the second channel of the second heat exchanger is also used for outputting flash steam.
7. A natural gas purification system, comprising at least one natural gas purification apparatus as claimed in any one of claims 1 to 6.
8. A natural gas processing system comprising the natural gas purification system of claim 7.
9. The method for regenerating the adsorbent in the adsorption tower is characterized by comprising the following steps of:
a temperature difference determination step of determining a temperature difference between gas output from the adsorption tower and gas input from the cold blowing step;
a first execution step, when the temperature difference is larger than a preset value, firstly performing heat exchange between cold air for cooling the adsorption tower in the cold blowing process and gas output by the adsorption tower in the adsorption process to raise the temperature, and then inputting the gas subjected to heat exchange and temperature rise into the adsorption tower in the cold blowing process to be used as cold blowing gas;
and a regeneration step, namely heating the gas output by the adsorption tower in the cold blowing process to a preset temperature, and inputting the heated gas into the adsorption tower in the hot blowing process to be used as regenerated gas.
10. The method as claimed in claim 9, further comprising, between the temperature difference determining step and the regenerating step:
and a second execution step of directly inputting the cold air into the adsorption tower in the cold blowing process as cold blowing air when the temperature difference is less than or equal to a preset value.
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| CN111001260A (en) * | 2019-12-29 | 2020-04-14 | 宁波弘景环保科技有限公司 | Organic waste gas recovery system |
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