CN102003915B - Device and method for processing pressure difference rise of low-temperature methanol washing crude gas precooling systems - Google Patents
Device and method for processing pressure difference rise of low-temperature methanol washing crude gas precooling systems Download PDFInfo
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- CN102003915B CN102003915B CN 201010536846 CN201010536846A CN102003915B CN 102003915 B CN102003915 B CN 102003915B CN 201010536846 CN201010536846 CN 201010536846 CN 201010536846 A CN201010536846 A CN 201010536846A CN 102003915 B CN102003915 B CN 102003915B
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Abstract
The invention relates to a device and method for processing pressure difference rise of low-temperature methanol washing crude gas precooling systems. The device is composed of two crude gas precooling systems in parallel, wherein each system comprises a heat exchanger and a gas-liquid separation tank; the two systems operate alternately; the raw gas inlet end of the heat exchanger of each system is provided with a desalted water flushing pipe; and the condensate outlet end of the gas-liquid separation tank of each system is provided with a washing sewage pipe. When one system fails, high-pressure high-temperature desalted water can be introduced after isolating the system, the attachment on the flow channel wall of the heat exchanger is fused, eroded, peeled and taken away by the pressure and the temperature of the desalted water, the washing water containing a great amount of impurities enters the gas-liquid separation tank and is processed by being sent to the a subsequent work section through the washing sewage pipe. The device and method can be used for cleaning crude gas precooling systems on line without reducing load, stopping or demounting the heat exchanger.
Description
Technical field
The present invention relates to low-temperature rectisol raw gas chilldown system, be specifically related to a kind of apparatus and method that low-temperature rectisol raw gas chilldown system pressure reduction raises of handling.
Background technology
The low-temperature rectisol technology is a kind of gas purifying technique of Physical Absorption principle, and it utilizes sour gas in the unstripped gas under certain pressure and lower temperature, in methyl alcohol, has the physical characteristic of big solubility, removes the sour gas in the unstripped gas with this.It is in the gas purifying technique of raw material production synthetic ammonia, town gas, hydrogen manufacturing, synthesizing methanol, artificial oil, synthetic natural gas or natural gas purification preparing liquefied natural gas etc. that the low-temperature rectisol technology is widely used in coal (petroleum coke), residual oil, natural gas etc.
Low-temp methanol washing process is the strange coal gasification low-temp methanol washing process in Shandong particularly, has following problem at the raw gas chilldown system:
Contain impurity such as saturation water, dust, macromolecule organic in the raw gas from the coal gas operation, though passed through separation, the composition that also has trace gets in the heat exchanger, in temperature-fall period, has solid crystal and separates out.Along with the device increase of running time, solid crystal can be cumulative, and constituent concentration changes in the unstripped gas in addition, and its reaction product also can be attached on the heat exchanger flow path wall.For example, carbon dioxide and ammonia can react under band pressure and lower temperature situation and generate the carbamic acid crystalline ammonium, and crystallization is attached to stopping up runner on the tube wall on the one hand, and etching apparatus should give removing on the other hand.For another example, when fluctuation appears in the low-temperature rectisol operating mode, the knockout drum liquid phase gets into the gas phase pipeline, and process feed gas is with liquid to get into heat exchanger in a large number, and temperature below freezing moment freezes, and stops up runner.The raw gas that above reason causes carries impurity and gets into together in the heat exchanger, under the heat exchanger cryogenic conditions, separate out solid attached to duct wall in, cause process gas pipeline circulation area to diminish; Circulation is obstructed, and the heat-transmission decrease in efficiency of heat exchanger influences the device operation on the one hand; Cause throughput to descend on the other hand; System's pressure reduction raises, and the processing of must stopping when even more serious influences the production run of enterprise.
Summary of the invention
The purpose of this invention is to provide a kind of device that is used to handle the rising of low-temperature rectisol raw gas chilldown system pressure reduction, and the processing method of pressure reduction rising.Apparatus and method of the present invention can be the lotus of not lightening the burden, do not stop, do not dismantle and realize under the prerequisite of heat exchanger that the on-line cleaning of raw gas chilldown system handles.
Low-temperature rectisol raw gas chilldown system is made up of a heat exchanger and a knockout drum; The process feed gas air inlet pipe connects heat exchanger raw material gas inlet end; The heat exchanger unstripped gas port of export is connected with knockout drum raw material gas inlet end through the unstripped gas tube connector, and the knockout drum unstripped gas port of export connects the process feed gas escape pipe, and the gas liquor port of export of knockout drum bottom is connected with the gas liquor drain pipe; Processing low-temperature rectisol raw gas chilldown system pressure reduction raising device of the present invention is made up of two cover raw gas chilldown systems side by side; Two cover system alternate runs, cover system operation, a cover system is isolated subsequent use; And being provided with a desalted water cleaning hose at the heat exchanger raw material gas inlet end of every cover system, the knockout drum gas liquor port of export of every cover system is provided with a wash water pipe.When a cover system generation problem wherein; With feeding the high pressure-temperature desalted water again after its isolation; Utilize the pressure and temperature of desalted water will be, wash away, peel off, take away attached to the attachment melting on the heat exchanger channels wall; The washings that contain a large amount of impurity after the flushing get into knockout drum, are sent to follow-up workshop section through the wash water pipe and handle.
In above-mentioned two cover systems, on the process feed gas air inlet pipe of every cover system, all the air inlet pipe stop valve to be set, all to set out the tracheae stop valve on the process feed gas escape pipe.
In above-mentioned two cover systems, a by-pass line all is set on the air inlet pipe stop valve of every cover system, the equalizing valve door is set on the by-pass line, carrying out equal press operation,
In above-mentioned two cover systems, on the desalted water cleaning hose of every cover system, all the desalted water stop valve to be installed, on the wash water pipe of knockout drum bottom, all the sewage stop valve to be installed.
In above-mentioned two cover systems; All to be equipped with at the low level place of the desalted water cleaning hose of every cover system and unstripped gas tube connector and to lead pouring, all discharging valve will be installed, when preventing that this system from coming into operation at the low level place of wash water pipe; Gather the washing desalted water that does not drain and bring system into depositing, cause the accident.
In above-mentioned two cover systems; On the wash water pipe of every cover system and knockout drum, be equipped with heat traced pipeline; To prevent that temperature from reducing, the impurity solids in the washing desalted water is separated out blocking pipe and equipment again, and the wash water that is rich in impurity after the washing is discharged system fast.
The washing medium that uses in the technique scheme can be a desalted water; It also can be boiler water; But possess certain pressure and temperature, the interval melt and dissolved temperature that will and handle impurity in the unstripped gas of actual temp is complementary, and will be complementary with the device technique condition between concrete pressure area.
In the technique scheme, heat exchanger is not only to be confined to single heat exchanger, can be the heat exchanger of multiple mode, for example the combined type tubular heat exchanger.
The present invention also provides a kind of said apparatus that uses to handle the method that low-temperature rectisol raw gas chilldown system pressure reduction raises, and the specific operation process of this method is:
Be provided with A, B two cover raw gas chilldown systems, suppose that the problem that pressure reduction raises, throughput reduces appears in the A system, prepare to come into operation the B system, the A system is isolated system handle, carry out according to the following steps order:
1), switches
A. check that all desalted water stop valves, the sewage stop valve on the B system wash water pipe on the desalted water cleaning hose all close and put in place;
B. the equalizing valve door of opening on the B system by-pass line is all pressed;
C. slowly open the cold medium terminal valve of technology of B system heat exchanger;
D. after treating that A, B two systems all press and finish; Slowly open the air inlet pipe stop valve on the B system process unstripped gas air inlet pipe, the escape pipe stop valve on the process feed gas escape pipe; Close the equalizing valve door behind the standard-sized sheet; Open B system knockout drum floor coal air water drain pipe valve, close A system knockout drum floor coal air water drain pipe valve;
2), isolate
A. slowly close the air inlet pipe stop valve on the A system process unstripped gas air inlet pipe, the escape pipe stop valve on the process feed gas escape pipe;
B. close the cold medium terminal valve of technology of A system heat exchanger;
3), flushing
A. open the discharging valve on the A system wash water pipe, close behind pressure release to the normal pressure;
B. open the sewage stop valve on the A system wash water pipe;
C. all that confirm the A system are led to drench and are closed, and open the desalted water stop valve on the desalted water cleaning hose, and the A system is carried out flushing operation;
D. wash qualified after, close the desalted water stop valve on the desalted water cleaning hose, open and lead the pouring draining on desalted water cleaning hose and the unstripped gas tube connector, arranged behind the water above-mentioned lead to drench close;
E. open wash water pipe discharging valve, arranged and be trapped in the intrasystem washing of A and use desalted water, close discharging valve;
The f.A system reserve.
Equally, the B system is the same to switching, isolation, the flushing operation flow process of A system, and just equipment, the valve with correspondence position exchanges operation.
In the above-mentioned processing method, should keep in the flushing process washing that to use the temperature of desalted water or boiler water be 100～130 ℃, and flushing needs lasting 8～10 hours.
Not only contain organic matters such as tar, naphthalene in the raw gas, also contain impurity such as saturation water and dust, they get into chilldown system with coal gas, under certain process conditions, can in heat-exchanger pipeline, adhere to, and cause the process gas circulation to be obstructed, and cause that system's pressure reduction raises.The apparatus and method that processing low-temperature rectisol raw gas chilldown system pressure reduction provided by the invention raises can these problems of online treatment; Through in the path that gathers obstruction, feeding the high pressure-temperature desalted water, utilize desalted water will be attached to the attachment melting on the flow path wall, wash away, peel off, take away, solved process gas pipeline circulation area and diminished; Circulation is obstructed; System's pressure reduction raises, the problem that the heat exchanger heat exchange efficiency descends, and effect is obvious.
The present invention need not dismantle equipment in processing procedure, do not stop, and does not subtract to produce load, does not influence production stable operation; The band pressure zone temperature desalted water or the boiler water wide material sources of washing usefulness needn't extraly be handled again, and drawing-in system can use, and can not cause secondary pollution to system, and simple to operate, effect is obvious.
Description of drawings
Fig. 1 handles the structural representation of the device of low-temperature rectisol raw gas chilldown system pressure reduction rising for the present invention;
Among the figure: 1/1 ' be respectively the process feed gas air inlet pipe of A/B system; 1a/1a ' is respectively the equalizing valve door of A/B system; 1b/1b ' is respectively the air inlet pipe stop valve of A/B system; 1c/1c ' is respectively the by-pass line of A/B system; 2/2 ' respectively is the desalted water cleaning hose of A/B system; 3/3 ' is respectively the desalted water stop valve of A/B system; 4/4 ' be respectively the heat exchanger of A/B system; 5/5 ' be respectively A/B system knockout drum; 6/6 ' be respectively the unstripped gas tube connector of A/B system; 7/7 ' be respectively the process feed gas escape pipe of A/B system; 8/8 ' be respectively the escape pipe stop valve of A/B system; 9/9 ' be respectively the gas liquor drain pipe of A/B system; 10/10 ' be respectively the wash water pipe of A/B system; 11/11 ' be respectively the sewage stop valve of A/B system; 12/12 ' be respectively the heat traced pipeline of A/B system; 13/13 ' be respectively the pouring of leading of A/B system; 14/14 ' be respectively the discharging valve of A/B system; 15/15 ' be respectively the cold medium imported valve of technology of A/B system; 16/16 ' be respectively the cold media outlet valve of technology of A/B system.
The specific embodiment
The pressure reduction height occurs to low-temperature rectisol raw gas chilldown system, throughput descends, and the problem that the heat exchanger heat exchange efficiency descends explain that in conjunction with Fig. 1 application the present invention handles the specific embodiment of this problem, but the present invention is not limited to this.
From but 37 ℃, 26.7bar (cutting off) coming of workshop section of conversion air cooling, carry coal dust, saturated vapor, C0
2, NH
4, macromolecule organic impurities such as naphthalene, tar raw gas; At first through a gas-liquid separation; Then get into a heat exchanger, through a knockout drum, the gas liquor of separating is delivered to gas liquor and is handled workshop section; After gas phase reclaims the primary system cold again, get into the low-temp methanol acid gas absorption and remove the unit.
Because the pressure reduction height often takes place chilldown system, throughput descends, degradation problem under the heat exchanger heat exchange efficiency; According to the present invention; The equipment and the pipeline that comprise heat exchanger and knockout drum are set to two systems, and like A system among Fig. 1 and B system, a system normally moves; Another system isolates flushing, washes the isolation of qualified back and is set to subsequent use.When throughput decline takes place, system's pressure reduction increases, and when heat exchange efficiency descended, two systems alternately switched, wash, isolate subsequent use according to certain cycle.Adopt pressure 20～50bar; The boiler feedwater that temperature is 90～120 ℃ is as washing medium; Get into the tube side (the process feed gas passage that contains saturation vapour and impurity) of heat exchanger; Utilize the pressure and temperature of boiler feedwater, will be melt and dissolved, wash away, peel off, take away attached to the attachment impurity on the flow path wall, flow into knockout drum subsequently.Because the gas-liquid separation tank is provided with the steam tracing device; So the dirt impurity that washes away in the wash water that gets off can not separated out solid crystal; Press in the high temperate zone of washings in addition; The knockout drum inwall is also played the effect of washing away, washing, be delivered to the wastewater treatment operation through the wash water pipe at the bottom of the jar at last.Owing to be surrounded by insulation material on the wash water pipe, so wash water can not separated out the crystallization blocking pipe.
As shown in Figure 1: A is original workshop section, and B is newly-increased system, supposes that the problem that above-mentioned pressure reduction is high, throughput reduces, the heat exchanger heat exchange efficiency descends appears in the A system, prepares to come into operation the B system, the A system is isolated system handle, and the concrete operations flow process is following:
1, switches
1) inspection on total desalted water cleaning hose the desalted water stop valve and lead pouring; B system desalted water cleaning hose 2 ' on desalted water stop valve 3 ' and lead drench 13 '; Unstripped gas tube connector 6 ' on lead drench 13 ', wash water pipe 10 ' on sewage stop valve 11 ' and discharging valve 14 ' whether all close put in place.Close put in place after, the equalizing valve door 1a ' that opens on the by-pass line 1c ' of B system all presses.
2) open B system heat exchanger 4 ' on the cold medium imported valve 15 of technology ', the cold media outlet valve 16 of technology '.
3) all press to accomplish after, open B system process unstripped gas air inlet pipe 1 ' on air inlet pipe stop valve 1b ', process feed gas escape pipe 7 ' on escape pipe stop valve 8 ', close equalizing valve door 1a '.
4) open B system knockout drum 5 ' floor coal air water drain pipe 9 ' on valve, close the valve on the A system knockout drum 5 floor coal air water drain pipes 9.
2, isolate
1) slowly close air inlet pipe stop valve 1b on the A system process unstripped gas air inlet pipe 1, the escape pipe stop valve 8 on the process feed gas escape pipe 7 is observed flow simultaneously and is had or not index, then suspends isolation if any the choke phenomenon.
2) close the cold medium imported valve 15 of technology on the A system heat exchanger 4, the cold media outlet valve 16 of technology.
3, flushing
1) opens discharging valve 14 on the A system wash water pipe 10, close behind pressure release to the normal pressure.
2) open sewage stop valve 11 on the A system wash water pipe 10.
3) all that confirm the A system are led and are drenched 13 and close, and open the desalted water stop valve 3 on the desalted water cleaning hose 2, and the A system is carried out flushing operation, and the temperature that keeps wash water was washed 8 hours at 102 ℃.
4) flushing qualified after, close the desalted water stop valve 3 on the desalted water cleaning hose 2, open leading on desalted water cleaning hose 2 and the unstripped gas tube connector 6 and drench 13 drainings, arrange and above-mentionedly behind the water has led pouring 13 and close.
5) open wash water pipe 10 discharging valves 14, arranged and be trapped in the intrasystem washing of A and use desalted water, close discharging valve 14.
6) A system reserve.
Equally, the B system is the same to switching, isolation, the flushing operation flow process of A system, and just equipment, the valve with correspondence position exchanges operation.
It is high that the present invention has been applied to solve the pressure reduction that occurs in Tianjimei Chemical Group Co.,Ltd's low-temperature rectisol raw gas chilldown system, and throughput decline is in the problem that the heat exchanger heat exchange efficiency descends.The inventive method is enacted in a periodic technological operation; Through regularly carrying out aforesaid operations of the present invention; Improved the cycle of operation of low temperature washing device for methanol greatly, fundamentally solved because the device underproduction, the stopping production problem that the chilldown system blockage problem causes received good effect.
Claims (6)
1. handle the device that low-temperature rectisol raw gas chilldown system pressure reduction raises for one kind; Comprise by a heat exchanger and the raw gas chilldown system that knockout drum is formed; The process feed gas air inlet pipe connects heat exchanger raw material gas inlet end; The heat exchanger unstripped gas port of export is connected with knockout drum raw material gas inlet end through the unstripped gas tube connector, and the knockout drum unstripped gas port of export connects the process feed gas escape pipe, and the condensate outlet end of knockout drum bottom is connected with the condensate liquid drain pipe; It is characterized in that this device overlaps the raw gas chilldown systems by two and forms side by side; Two cover system alternate runs are provided with a desalted water cleaning hose at the heat exchanger raw material gas inlet end of every cover system, and the knockout drum condensate outlet end of every cover system is provided with a wash water pipe.
2. the device that processing low-temperature rectisol raw gas chilldown system pressure reduction according to claim 1 raises is characterized in that the air inlet pipe stop valve is set on the process feed gas air inlet pipe, on the process feed gas escape pipe, sets out the tracheae stop valve.
3. the device that processing low-temperature rectisol raw gas chilldown system pressure reduction according to claim 2 raises is characterized in that a by-pass line is set on the air inlet pipe stop valve, and the equalizing valve door is set on the by-pass line.
4. the device that processing low-temperature rectisol raw gas chilldown system pressure reduction according to claim 1 raises is characterized in that on the desalted water cleaning hose, being equipped with the desalted water stop valve, on the wash water pipe of knockout drum bottom, the sewage stop valve is installed.
5. the device that processing low-temperature rectisol raw gas chilldown system pressure reduction according to claim 1 raises is characterized in that being equipped with at the low level place of desalted water cleaning hose and unstripped gas tube connector and leads pouring, at the low level place of wash water pipe installation discharging valve.
6. the device that processing low-temperature rectisol raw gas chilldown system pressure reduction according to claim 1 raises is characterized in that on wash water pipe and knockout drum, being provided with heat traced pipeline.
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| CN105779026B (en) * | 2016-03-11 | 2019-04-09 | 神华集团有限责任公司 | Methanol washes system |
| CN107377167A (en) * | 2017-08-22 | 2017-11-24 | 四川重盟电力设备制造有限公司 | The crushing system of sieving approach all-in-one is arranged around ground coal bunker |
| CN108827062A (en) * | 2018-07-25 | 2018-11-16 | 润电能源科学技术有限公司 | A kind of biological control method and device |
| CN109357565A (en) * | 2018-12-21 | 2019-02-19 | 天脊煤化工集团股份有限公司 | A kind of low-temp methanol washes unstripped gas precooler cleaning device and technique |
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| GB1478419A (en) * | 1975-01-28 | 1977-06-29 | Air Prod & Chem | Reversible heat exchanger or regenerator systems |
| JPH0773656B2 (en) * | 1991-01-23 | 1995-08-09 | 東電工業株式会社 | Deodorizing device for water chamber of steam turbine condenser |
| CN2270726Y (en) * | 1995-10-31 | 1997-12-17 | 陆晓霞 | Fully automatic continuous ion exchange fibrous water softener |
| JPH10253271A (en) * | 1997-03-10 | 1998-09-25 | Toshiba Corp | Coolant system of generation plate |
| CN1218866C (en) * | 2002-04-03 | 2005-09-14 | 中国石油化工集团公司 | Low temperature methanol cleaning process |
| CN1506150A (en) * | 2002-12-06 | 2004-06-23 | 中国石化集团兰州设计院 | Acid gas purification and recovery process |
| DE102007008690A1 (en) * | 2007-02-20 | 2008-08-21 | Linde Ag | Production of gas products from synthesis gas |
| CN201876194U (en) * | 2010-11-10 | 2011-06-22 | 天脊煤化工集团股份有限公司 | Differential pressure rise processing device for rectisol raw gas precooling system |
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