CN115432903B - Low-temperature sludge drying thermodynamic system - Google Patents
Low-temperature sludge drying thermodynamic system Download PDFInfo
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- CN115432903B CN115432903B CN202210911976.9A CN202210911976A CN115432903B CN 115432903 B CN115432903 B CN 115432903B CN 202210911976 A CN202210911976 A CN 202210911976A CN 115432903 B CN115432903 B CN 115432903B
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- 239000010802 sludge Substances 0.000 title claims abstract description 201
- 238000001035 drying Methods 0.000 title claims abstract description 67
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 197
- 238000001704 evaporation Methods 0.000 claims abstract description 6
- 230000008020 evaporation Effects 0.000 claims abstract description 5
- 238000009833 condensation Methods 0.000 claims description 6
- 230000005494 condensation Effects 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 229920006395 saturated elastomer Polymers 0.000 claims description 4
- 230000001877 deodorizing effect Effects 0.000 claims description 2
- 238000003303 reheating Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 86
- 238000005265 energy consumption Methods 0.000 abstract description 8
- 239000002912 waste gas Substances 0.000 abstract description 6
- 238000010438 heat treatment Methods 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract description 5
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 238000011282 treatment Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 238000001816 cooling Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000002918 waste heat Substances 0.000 description 5
- 239000000356 contaminant Substances 0.000 description 4
- 238000004332 deodorization Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 208000005156 Dehydration Diseases 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 241000914012 Lutjanus gibbus Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Drying Of Solid Materials (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a low-temperature sludge drying thermodynamic system which combines a blade type sludge dryer, an internal circulation waterway and a low-temperature sludge dryer into a whole sludge drying thermodynamic system. The invention skillfully utilizes the high-temperature high-humidity waste gas and the high-temperature steam condensate water which are originally discharged by the blade type sludge dryer as the supply raw materials of the internal circulating water, and the internal circulating water can continuously provide the heat energy required by the drying of the low-temperature sludge dryer, so that the low-temperature sludge dryer does not need to be equipped with any heating unit, and zero energy consumption is truly realized. The internal circulating water can also continuously heat the gas in the low-temperature sludge drying machine, the temperature in the low-temperature sludge drying machine is maintained at a higher level, the heat energy lost by evaporation heat absorption in the sludge drying process is counteracted, the gas always circulates in the equipment, and zero emission is realized.
Description
Technical Field
The invention relates to the technical field of heat exchange, in particular to a low-temperature sludge drying thermodynamic system.
Background
Sludge is a product after sewage treatment and has the main characteristics of high water content and high organic matter content, and is easy to decompose and stink. The aim of sludge treatment is to return contaminants from the industry as raw material back into the process, since the contaminants are in fact raw material lost in the industrial process, the medium lost is mostly water, and thus removal of water from the sludge allows a large amount of potential contaminants to be reused. The contaminants contained in the sludge generally have a high calorific value, but the calorific value of this portion cannot be utilized due to the presence of a large amount of moisture in the sludge. If the sludge with high water content is incinerated, not only the heat value is not obtained, but also a large amount of fuel is needed to be supplemented to complete combustion, so that the combustion is possible as long as the water content of the sludge is reduced to a certain degree, and the key of sludge resource utilization is to reduce the water content in the sludge, namely sludge drying.
A low-temperature sludge drier is a common sludge drier. The main principle is as follows: the sludge with high water content is sent into the equipment, then dry hot air or other heat media are sent into the equipment, so that the moisture in the sludge absorbs heat and is continuously vaporized to generate a large amount of saturated vapor, and finally the equipment discharges air containing a large amount of vapor and partial dry material components and passes through units such as dust removal, deodorization and the like. And (3) treating, and discharging the treated waste gas to the atmosphere after reaching the emission standard.
Since the core principle of the low-temperature sludge drier is to generate heat energy exchange inside the equipment, the low-temperature sludge drier must rely on a large amount of heat energy to evaporate water in the sludge, and particularly a large-power large-scale drier, which needs to be heated in a large amount to generate heat media, has very high energy consumption. On the other hand, the discharge of equipment is also a problem, and firstly, the discharged gas can carry a part of sludge materials and needs to be subjected to various process treatments such as dust removal, deodorization and the like, so that higher cost is brought; meanwhile, the material loss of the sludge can be caused after long-time operation, and the sludge recycling rate is reduced. In conclusion, the problems of high energy consumption, high emission and high running cost of the low-temperature sludge drier are caused.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a low-temperature sludge drying thermodynamic system which can solve the problems of high energy consumption, high emission and high operation cost of the existing low-temperature sludge drying machine.
The invention is realized by the following technical scheme:
A low temperature sludge drying thermodynamic system comprising: blade type sludge dryer; the input end of the condensed water energy-saving device is communicated with a steam condensation water port of the paddle type sludge dryer, and the condensed water energy-saving device is externally connected to an external condensation collection box; an internal circulation water tank; the air inlet end of the tail gas energy-saving device is communicated with the air outlet of the blade type sludge dryer, and the water inlet end of the tail gas energy-saving device is communicated with the water outlet end of the internal circulation water tank; the water outlet end of the tail gas energy-saving device is communicated with the input end of the condensed water energy-saving device; the low-temperature sludge drying machine is characterized in that a lower air heater and an upper air heater are respectively arranged at the bottom and the top of the low-temperature sludge drying machine, the air inlet end and the air outlet end of the lower air heater and the air outlet end of the upper air heater are communicated with the interior of the low-temperature sludge drying machine, and sludge to be dried is accommodated in the interior of the low-temperature sludge drying machine; the output end of the condensed water energy-saving device is communicated with the water inlet end of the lower air heater, and the water outlet end of the lower air heater is communicated with the input end of the internal circulation water tank; the output end of the condensed water energy-saving device is also communicated with the water inlet end of the upper air heater, and the water outlet end of the upper air heater is communicated with the input end of the internal circulation water tank.
Further, the low-temperature sludge dryer further comprises: a tail gas condenser; the air inlet end of the tail gas condenser is communicated to the air outlet of the low-temperature sludge drier, and the air outlet end of the tail gas condenser is communicated to the air inlet end of the upper air heater.
Further, the low-temperature sludge dryer also comprises a bypass branch; the air inlet end of the bypass branch is arranged between the air outlet of the low-temperature sludge drier and the air inlet end of the tail gas condenser, and the air outlet end of the bypass branch is arranged between the air outlet end of the tail gas condenser and the air inlet end of the upper air heater; a bypass control valve is arranged on the bypass branch; and a main path control valve is arranged on the air inlet end of the tail gas condenser.
Further, a humidity sensor is arranged at the exhaust port of the low-temperature sludge dryer; the humidity sensor is used for controlling the bypass control valve and the main control valve to be opened and closed.
Further, the opening preset threshold value of the main control valve is RH80%.
Further, the low-temperature sludge drying thermodynamic system further comprises: an original cooler; the air inlet end of the original cooler is communicated with the air outlet end of the tail gas energy-saving device; the air outlet end of the original cooler is connected with an external deodorizing system.
Further, the water inlet end and the water outlet end of the original cooler are communicated with an external cooling water tower.
Further, the water inlet end and the water outlet end of the tail gas condenser are communicated with an external cooling water tower.
Further, the paddle type sludge dryer is provided with a steam inlet for high-temperature steam to enter.
Further, the paddle type sludge dryer is provided with a sludge inlet for feeding and a sludge outlet for discharging.
Compared with the prior art, the invention has the following beneficial effects:
The invention combines the blade type sludge dryer, the internal circulation waterway and the low-temperature sludge dryer into a set of integral sludge drying thermodynamic system.
The original discharged condensed water of the blade type sludge dryer enters the condensed water energy-saving device, the original discharged waste gas enters the condensed water energy-saving device after passing through the tail gas energy-saving device, the condensed water and the waste gas realize heat exchange in the condensed water energy-saving device, then the condensed water energy-saving device outputs two paths of hot water which are respectively conveyed into a lower air heater and an upper air heat exchanger of the low-temperature sludge dryer, and heat energy required by sludge drying is provided for the low-temperature sludge dryer.
The first path of hot water output by the condensed water energy-saving device flows into the lower air heater and exchanges heat with the internal air of the low-temperature sludge drying machine, so that the temperature of the air in the low-temperature sludge drying machine is continuously increased, and the moisture in the sludge material is evaporated; meanwhile, the first path of hot water after heat exchange can be cooled and enters the internal circulation water tank to wait for circulation.
The sludge material evaporates a large amount of water, the upper part of the low-temperature sludge drier discharges gas containing a large amount of saturated water vapor, the exhaust gas enters an upper air heater, and the condensed water energy-saving device outputs a second path of hot water to enter the upper air heater to exchange heat with the gas of the low-temperature sludge drier. After heat exchange, the gas is heated and returned to the inside of the low-temperature sludge drying machine, so that the inside of the low-temperature sludge drying machine is ensured to maintain high temperature; meanwhile, the second path of hot water can be cooled after heat exchange, and enters the internal circulation water tank to wait for circulation.
At the moment, the first path of water and the second path of water after cooling are collected in the internal circulation water tank and are output to a tail gas energy-saving device connected with the back of the blade type sludge dryer, heat exchange is achieved with blade type tail gas, cooling treatment is achieved on the blade type tail gas, meanwhile, the collected internal circulation water is heated again and is input to a condensed water energy-saving device, and hot water required by the condensed water energy-saving device is provided for the condensed water energy-saving device. Thus, complete internal circulation of the waterway is realized.
In the working flow of the whole system, (1) the high-temperature high-humidity waste gas and the high-temperature steam condensate water originally discharged by the paddle type sludge dryer are ingeniously utilized as the supply raw materials of the internal circulating water, and the internal circulating water can continuously provide the heat energy required by the drying of the low-temperature sludge dryer, so that the low-temperature sludge dryer does not need to be provided with any heating unit, and zero energy consumption is truly realized; (2) The internal circulating water can also continuously heat the gas in the low-temperature sludge drying machine, so that the temperature in the low-temperature sludge drying machine is maintained at a higher level, the heat energy lost by evaporation heat absorption in the sludge drying process is counteracted, the gas always circulates in the equipment, and zero emission is realized; (3) The internal circulating water provides heat energy for the low-temperature sludge dryer, the temperature of the low-temperature sludge dryer can be reduced after heat exchange, the cooled water enters the internal circulating water tank again and is output to the tail gas energy saver connected with the blade type sludge dryer again, so that the tail gas of the blade type sludge dryer is cooled, and the prepositive cooling of the tail gas for the subsequent treatment is realized; meanwhile, the internal circulating water after heat exchange is heated again and enters the condensed water energy-saving device again to be used as high-temperature water storage, and the heat energy can be continuously provided for the low-temperature sludge drying machine.
Therefore, the blade type sludge dryer and the low-temperature sludge dryer are combined into a complete drying system through the internal circulation waterway, redundant waste heat is effectively utilized, and the two devices can be combined and utilized in an advantageous manner through water circulation and a plurality of heat exchange reactions in the system, so that the low-temperature sludge dryer realizes zero energy consumption. Meanwhile, the gas of the low-temperature sludge drying machine returns to the inside of the equipment after being reheated, and in the process, the gas circulates in the equipment all the time, so that zero emission is truly realized, the low-temperature sludge drying machine is not required to be provided with any dust removal and deodorization units, the running cost of the equipment is reduced, and meanwhile, the loss of sludge materials along with emission is avoided.
Drawings
Fig. 1 is a schematic diagram of a low-temperature sludge drying thermodynamic system disclosed by the invention.
In the figure: 10. blade type sludge dryer; 11. a steam inlet; 12. a sludge inlet; 13. a sludge outlet; 20. a condensed water economizer; 30. an internal circulation water tank; 40. a tail gas economizer; 50. a low-temperature sludge drier; 51. a lower air heater; 52. an upper air heater; 60. a tail gas condenser; 61. a main control valve; 70. a bypass branch; 71. a bypass control valve; 80. a humidity sensor; 90. an original cooler.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and detailed description, wherein it is to be understood that, on the premise of no conflict, the following embodiments or technical features may be arbitrarily combined to form new embodiments.
In the description of the present invention, it should be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1, the invention discloses a low-temperature sludge drying thermodynamic system, which comprises: the blade type sludge dryer 10, the condensed water energy-saving device 20, the internal circulation water tank 30, the tail gas energy-saving device 40 and the low-temperature sludge dryer 50 are communicated through corresponding pipelines to realize connection.
In a specific embodiment, taking the total heating power of the low-temperature sludge drying machine 50 as 1500KW as an example:
Wherein the paddle sludge dryer 10 is an existing apparatus. The inside of the equipment is provided with a blade structure. The blade type sludge dryer 10 is provided with an air inlet for high-temperature steam to enter, a sludge inlet 12 for sludge feeding and a sludge outlet 13 for sludge discharging at the side. The sludge material enters the blade type sludge dryer 10 from the sludge inlet 12, high-temperature steam is introduced from the steam inlet 11, so that the water contained in the sludge is evaporated, and two paths of products, namely high-temperature tail gas (115 ℃) and high-temperature condensed water (159 ℃) respectively, are obtained, wherein the high-temperature condensed water comprises 90% of condensed water and 10% of flash steam. Then, through the rotation of the blade structure, high-temperature tail gas is output from the exhaust port of the blade type sludge dryer 10, and high-temperature condensed water is discharged from the steam condensation water port of the blade type sludge dryer 10.
The condensed water economizer 20 is used for receiving waste heat generated in the operation process of the paddle type sludge dryer 10 and continuously providing the waste heat to the low-temperature sludge dryer 50 as a heat source for drying the low-temperature sludge. Specifically, the input end of the condensed water economizer 20 is connected to a steam condensate water port of the paddle sludge dryer 10 for receiving high temperature wastewater (159 ℃, including 90% condensed water and 10% flash steam) of the paddle sludge dryer 10. The condensed water economizer 20 is also externally connected to an external condensed collection tank.
The internal circulation water tank 30 plays a role of a transfer station for collecting and outputting internal circulation water for the internal circulation water path of the system.
The tail gas economizer 40 is used for pre-cooling the high-temperature and high-humidity tail gas generated by the blade type sludge dryer 10. The air inlet end of the tail gas energy-saving device 40 is communicated with the air outlet of the blade type sludge dryer 10; the water inlet end of the tail gas economizer 40 is connected to the water outlet end of the internal circulation tank 30, and the water outlet end is connected to the input end of the condensate water economizer 20. Taking the power 1134KW of the tail gas economizer 40 as an example, the internal circulation water tank 30 inputs internal circulation water (sources of the internal circulation water will be mentioned later) into the tail gas economizer 40, and in the tail gas economizer 40, the internal circulation water (60 ℃) exchanges heat with high temperature tail gas (115 ℃), then the high temperature tail gas is cooled (85 ℃), the internal circulation water is warmed (75 ℃), then the internal circulation water is sent into the condensed water economizer 20, and after being collected with high temperature condensed water (159 ℃) discharged from the paddle type sludge dryer 10, the internal circulation water of 85 ℃) is formed inside the condensed water economizer 20 for providing a heat source for the low temperature sludge dryer 50.
The bottom and the top of the low-temperature sludge drier 50 are respectively provided with a lower air heater 51 and an upper air heater 52, the air inlet end and the air outlet end of the lower air heater 51 and the upper air heater 52 are communicated with the inside of the low-temperature sludge drier 50, and the inside of the low-temperature sludge drier 50 is used for accommodating sludge to be dried. And heat is exchanged with air in the heater (indirect heating) by introducing a heat source into the heater, so that moisture in the sludge is evaporated, and sludge drying is realized.
The condensed water economizer 20 (for example, 766 KW) outputs two hot water paths, and sends the first hot water path and the second hot water path to the lower air heater 51 and the upper air heater 52, respectively.
The output end of the condensed water economizer 20 is connected to the water inlet end of the lower air heater 51 for providing a heat source for the low temperature sludge dryer. The water outlet end of the lower air heater 51 is communicated with the input end of the internal circulation water tank 30, and the condensed water economizer 20 injects 85 ℃ internal circulation water, namely first hot water, into the lower air heater 51 to exchange heat with the internal air of the low-temperature sludge drying machine 50, so that the temperature of the interior of the low-temperature sludge drying machine 50 is raised, and the condition of water evaporation is achieved. After heat exchange, the internal circulation water of the lower air heater 51 is re-injected into the internal circulation water tank 30 for re-supply to the tail gas economizer 40.
Meanwhile, the output end of the condensed water economizer 20 is also connected to the water inlet end of the upper air heater 52, and the water outlet end of the upper air heater 52 is connected to the output end of the inner circulation tank 30. The function of this embodiment is that: after the temperature in the low-temperature sludge drier 50 is raised, the moisture in the sludge is evaporated, the upper part of the low-temperature sludge drier 50 discharges gas (54 ℃) containing a large amount of saturated steam, the gas enters into the upper air heater 52, at the moment, the condensed water economizer 20 injects the internal circulating water of 85 ℃ into the upper air heater 52, namely the second path of hot water, and the two heat exchange is carried out, the gas is reheated (to 80 ℃), and then the gas returns to the low-temperature sludge drier 50, so that the inside of the low-temperature sludge drier 50 is always kept at a higher temperature, and the drying efficiency is ensured. After heat exchange, the second hot water is cooled (to 60 ℃) and refilled into the internal circulation tank 30 to be collected with the first hot water for being supplied to the tail gas economizer 40 again.
At this time, the first hot water and the second hot water (at 60 ℃ in this time) after cooling are collected in the internal circulation water tank 30, and the internal circulation water is output to the tail gas economizer 40 connected to the rear of the paddle sludge dryer 10, exchanges heat with the paddle tail gas (115 ℃) to cool the tail gas discharged from the paddle (80 ℃), and meanwhile, the internal circulation water is heated again to (75 ℃) and is reinjected into the condensed water economizer 20 to provide the heat source required by the condensed water economizer 20. Thus, complete internal circulation of the waterway is realized.
The invention combines the blade type sludge dryer 10, the internal circulation waterway and the low-temperature sludge dryer 50 into a set of integral sludge drying thermodynamic system. In the workflow of the whole system: (1) The high-temperature high-humidity waste gas and the high-temperature steam condensate water originally discharged by the paddle type sludge dryer 10 are ingeniously utilized as raw materials of the internal circulating water, the internal circulating water can continuously provide the heat energy required by the drying of the low-temperature sludge dryer 50, and the waste heat discharged by the paddle type sludge dryer 10 is effectively utilized, so that the low-temperature sludge dryer 50 does not need to be provided with any heating unit, and zero energy consumption is truly realized; (2) The internal circulating water can also continuously heat the gas in the low-temperature sludge drying machine 50, so that the temperature in the low-temperature sludge drying machine 50 is maintained at a higher level, the heat energy lost by evaporation and heat absorption in the sludge drying process is counteracted, the gas always circulates in the equipment, and zero emission is realized; (3) The internal circulating water provides heat energy for the low-temperature sludge dryer 50, the temperature is reduced after heat exchange, the cooled water enters the internal circulating water tank 30 again and is output to the tail gas energy economizer 40 connected with the rear of the blade type sludge dryer 10 again, so that the tail gas of the blade type sludge dryer 10 is cooled, and the prepositive cooling is realized for the subsequent treatment of the tail gas; meanwhile, the internal circulating water after heat exchange is heated again and enters the condensed water energy-saving device 20 again to be used as high-temperature water storage, and the heat energy can be continuously provided for the low-temperature sludge drying machine 50.
Therefore, the blade type sludge dryer 10 and the low-temperature sludge dryer 50 are skillfully combined into a complete drying system through the internal circulation waterway, redundant waste heat is effectively utilized, two devices can be combined and utilized in an advantageous way through water circulation and a plurality of heat exchange reactions in the system, and zero energy consumption of the low-temperature sludge dryer 50 is realized. Meanwhile, the gas of the low-temperature sludge drier 50 can return to the inside of the equipment after being reheated, and in the process, the gas always circulates in the inside of the equipment, so that zero emission is truly realized, the low-temperature sludge drier 50 is not required to be provided with any dust removal and deodorization units, the running cost of the equipment is reduced, and meanwhile, the loss of sludge materials along with emission is avoided.
Since the exhaust gas of the low-temperature sludge drying machine 50 is saturated with a large amount of water vapor, after the water content of the exhaust gas reaches a certain level, the exhaust gas is subjected to condensation dehydration treatment, and then the exhaust gas is circulated in the low-temperature sludge drying machine 50. For this purpose, the low-temperature sludge dryer 50 is preferably further provided with an exhaust gas condenser 60; the air inlet end of the tail gas condenser 60 is communicated with the air outlet of the low-temperature sludge drier 50 and is used for receiving high-humidity exhaust gas generated by the low-temperature sludge drier 50 in the sludge drying process; the exhaust gas condenser 60 has an outlet end connected to the inlet end of the upper air heater 52, so that the exhaust gas enters the upper air heater 52 after being condensed and dehydrated. The water inlet end and the water outlet end of the tail gas condenser 60 are communicated with an external cooling water tower.
In order to reduce the power consumption, the tail gas condenser 60 stops working under the unnecessary condition, and the exhaust of the low-temperature sludge drier 50 needs to reach a certain water content, so that the tail gas condenser 60 is connected into the system to work. For this purpose, the low-temperature sludge dryer 50 is preferably further provided with a bypass branch 70, wherein an air inlet end of the bypass branch 70 is arranged between an air outlet of the low-temperature sludge dryer 50 and an air inlet end of the tail gas condenser 60, and an air outlet end is arranged between an air outlet end of the tail gas condenser 60 and an air inlet end of the upper air. The bypass branch 70 is provided with a bypass control valve 71, and the intake end of the tail gas condenser 60 is provided with a main control valve 61. Thus, the bypass branch 70 and the tail gas condenser 60 form two parallel branches, and when the water content of the exhaust gas is low, the bypass branch 70 is selectively connected, so that the tail gas condenser 60 is in standby and does not work; when the water content of the exhaust gas is high, the exhaust gas is connected to the selective connection exhaust gas condenser 60 to carry out dehydration treatment.
The detection of the moisture content of the exhaust gas is achieved by installing the humidity sensor 80. Preferably, a humidity sensor 80 is arranged at the exhaust port of the low-temperature sludge drier 50, the relative humidity of the exhaust gas of the low-temperature sludge drier 50 is detected by the humidity sensor 80, and if the relative humidity reaches a preset threshold value, the main control valve 61 is controlled to be opened, and the bypass control valve 71 is controlled to be closed; if the threshold cannot be reached, the bypass control valve 71 is controlled to be opened, and the main control valve 61 is controlled to be closed. In one embodiment, the predetermined threshold for opening the main control valve 61 is RH80%.
The tail gas treatment pipeline of the blade type sludge dryer 10 is also provided with an original cooler 90, and the original cooler 90 is originally provided with the blade type sludge dryer 10, and belongs to the prior art; the tail gas condenser 60 is connected between the exhaust port of the blade type sludge dryer 10 and the original cooler 90, the front-mounted heat dissipation is performed on the high-temperature tail gas in advance by utilizing the internal circulation waterway of the system, and then the tail gas enters the original cooler 90, so that the power consumption of the original cooler 90 is reduced. The water inlet end and the water outlet end of the original cooler 90 are communicated with an external cooling water tower.
The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention are intended to be within the scope of the present invention as claimed.
Claims (6)
1. A low temperature sludge drying thermodynamic system, comprising:
blade type sludge dryer;
The input end of the condensed water energy-saving device is communicated with a steam condensation water port of the paddle type sludge dryer, and the condensed water energy-saving device is externally connected to an external condensation collection box;
An internal circulation water tank;
The air inlet end of the tail gas energy-saving device is communicated with the air outlet of the blade type sludge dryer, and the water inlet end of the tail gas energy-saving device is communicated with the water outlet end of the internal circulation water tank; the water outlet end of the tail gas energy-saving device is communicated with the input end of the condensed water energy-saving device;
the low-temperature sludge drying machine is characterized in that a lower air heater and an upper air heater are respectively arranged at the bottom and the top of the low-temperature sludge drying machine, the air inlet end and the air outlet end of the lower air heater and the air outlet end of the upper air heater are communicated with the interior of the low-temperature sludge drying machine, and sludge to be dried is accommodated in the interior of the low-temperature sludge drying machine;
The output end of the condensed water energy-saving device is communicated with the water inlet end of the lower air heater, and the water outlet end of the lower air heater is communicated with the input end of the internal circulation water tank; the output end of the condensed water energy-saving device is also communicated with the water inlet end of the upper air heater, and the water outlet end of the upper air heater is communicated with the input end of the internal circulation water tank;
The low-temperature sludge drier further comprises: a tail gas condenser; the air inlet end of the tail gas condenser is communicated with the air outlet of the low-temperature sludge drier, and the air outlet end of the tail gas condenser is communicated with the air inlet end of the upper air heater;
The low-temperature sludge drier also comprises a bypass branch;
The air inlet end of the bypass branch is arranged between the air outlet of the low-temperature sludge drier and the air inlet end of the tail gas condenser, and the air outlet end of the bypass branch is arranged between the air outlet end of the tail gas condenser and the air inlet end of the upper air heater;
A bypass control valve is arranged on the bypass branch; the air inlet end of the tail gas condenser is provided with a main control valve;
a humidity sensor is arranged at the exhaust port of the low-temperature sludge drier; the humidity sensor is used for controlling the bypass control valve and the main control valve to be opened and closed;
In the tail gas energy-saving device, the 60 ℃ internal circulating water discharged by the internal circulating water tank exchanges heat with the 115 ℃ high-temperature tail gas discharged by the paddle type sludge dryer, then the high-temperature tail gas is cooled, the internal circulating water is heated to 75 ℃, then the 75 ℃ internal circulating water is sent into the condensed water energy-saving device, and after being converged with the 159 ℃ high-temperature condensed water discharged by the paddle type sludge dryer, the condensed water energy-saving device forms 85 ℃ internal circulating water for providing a heat source for the low-temperature sludge dryer;
The condensed water energy-saving device outputs two paths of hot water, and the first path of hot water and the second path of hot water are respectively conveyed to the lower air heater and the upper air heater;
the condensed water energy-saving device injects internal circulating water into the lower air heater, namely the first hot water, exchanges heat with the internal air of the low-temperature sludge drying machine, so that the temperature of the internal of the low-temperature sludge drying machine is raised, and the condition of water evaporation is achieved; after heat exchange, the internal circulating water of the lower air heater is reinjected into the internal circulating water tank for being provided for the tail gas energy-saving device again;
After the temperature in the low-temperature sludge drying machine is increased, evaporating water in the sludge, discharging a gas containing a large amount of saturated steam from the upper part of the low-temperature sludge drying machine, enabling the exhaust gas to enter an upper air heater, and enabling the condensed water economizer to inject internal circulating water into the upper air heater, namely the second path of hot water, to exchange heat, reheating the exhaust gas, and enabling the exhaust gas to return to the low-temperature sludge drying machine again, so that the inside of the low-temperature sludge drying machine is always maintained at a higher temperature; after heat exchange, the second path of hot water is cooled and is reinjected into the internal circulation water tank, and the internal circulation water tank and the first path of hot water are collected and are used for being provided for the tail gas energy-saving device again;
The low-temperature sludge drying thermodynamic system further comprises: an original cooler; the air inlet end of the original cooler is communicated with the air outlet end of the tail gas energy-saving device; the air outlet end of the original cooler is connected with an external deodorizing system.
2. The low-temperature sludge drying thermodynamic system of claim 1, wherein the opening preset threshold of the main control valve is RH80%.
3. The low-temperature sludge drying thermodynamic system of claim 1, wherein the water inlet end and the water outlet end of the original cooler are communicated with an external cooling water tower.
4. The low temperature sludge drying thermodynamic system of claim 1, wherein the water inlet end and the water outlet end of the tail gas condenser are communicated with an external cooling water tower.
5. A low temperature sludge drying thermodynamic system as claimed in claim 1, wherein the paddle sludge dryer is provided with a steam inlet for the ingress of high temperature steam.
6. The low temperature sludge drying thermodynamic system of claim 1, wherein the paddle sludge dryer is provided with a sludge inlet for feeding and a sludge outlet for discharging.
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| CN104671633A (en) * | 2015-03-16 | 2015-06-03 | 天华化工机械及自动化研究设计院有限公司 | Steam condensate preheating and steam drying two-stage energy-saving sludge drying method |
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| CN109626791A (en) * | 2019-01-30 | 2019-04-16 | 北京中矿环保科技股份有限公司 | Sludge drying device and sludge drying method |
| CN113493293A (en) * | 2021-07-26 | 2021-10-12 | 浙江中铅华炼环保科技有限公司 | Waste heat type closed full-circulation belt type drying system |
| CN114230131A (en) * | 2022-01-19 | 2022-03-25 | 北京首创污泥处置技术有限公司 | Sludge segmented heat drying system |
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