CN102003915A - 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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- CN102003915A CN102003915A CN 201010536846 CN201010536846A CN102003915A CN 102003915 A CN102003915 A CN 102003915A CN 201010536846 CN201010536846 CN 201010536846 CN 201010536846 A CN201010536846 A CN 201010536846A CN 102003915 A CN102003915 A CN 102003915A
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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, has the physical characteristic of big solubility in methyl alcohol, removes sour gas in the unstripped gas with this.It is that raw material is produced in the gas purifying technique of 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, and there are the following problems 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 enters in the heat exchanger, has solid crystal and separate out in temperature-fall period.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 reaction generate the carbamic acid crystalline ammonium under band pressure and lower temperature situation, and crystallization is attached to stopping up runner on the tube wall on the one hand, and etching apparatus be 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 enters the gas phase pipeline, and process feed gas is with liquid to enter 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 enters in the heat exchanger together, 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 in load shedding not, 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 by the unstripped gas tube connector, the knockout drum unstripped gas port of export connects the process feed gas escape pipe, 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 of side by side two cover raw gas chilldown systems, two cover system alternate runs, the operation of one cover system, one cover system is isolated standby, 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, to feed 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 enter knockout drum, are sent to follow-up workshop section by 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, bring system into depositing the poly-washing desalted water that does not drain, 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, pressure release is closed to 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 desalted water of A, 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, the temperature that should keep in the flushing process washing with desalted water or boiler water is 100～130 ℃, and flushing needs to continue 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 enter chilldown system with coal gas, can adhere in heat-exchanger pipeline under certain process conditions, 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 processing, by 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, having solved process gas pipeline circulation area diminishes, 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 additionally 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 at low-temperature rectisol raw gas chilldown system, throughput descends, and the problem that the heat exchanger heat exchange efficiency descends illustrate 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 enter 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, enter low-temp methanol sour gas absorbing and removing unit.
Because the pressure reduction height often takes place in 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 as 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 standby.When throughput decline takes place, system's pressure reduction increases, and when heat exchange efficiency descended, two systems alternately switched, wash, isolate standby according to certain cycle.Adopt pressure 20～50bar, the boiler feedwater that temperature is 90～120 ℃ is as washing medium, enter 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 attached to the attachment impurity on the flow path wall, wash away, peel off, take away, 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 by 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 of above-mentioned pressure reduction height, throughput minimizing, the decline of heat exchanger heat exchange efficiency 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 as follows:
1, switches
1) checks the desalted water stop valve on total desalted water cleaning hose 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 finish 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) open discharging valve 14 on the A system wash water pipe 10, pressure release is closed to 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 desalted water of A, 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.
The present invention has been applied to solve the pressure reduction height that occurs in Tianjimei Chemical Group Co.,Ltd's low-temperature rectisol raw gas chilldown system, and throughput descends, in the problem that the heat exchanger heat exchange efficiency descends.The inventive method is enacted in a periodic technological operation, by 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 (8)
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 by the unstripped gas tube connector, the knockout drum unstripped gas port of export connects the process feed gas escape pipe, 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, heat exchanger raw material gas inlet end at every cover system is provided with a desalted water cleaning hose, 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, sets out the tracheae stop valve on the process feed gas escape pipe.
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 being equipped with the desalted water stop valve on the desalted water cleaning hose, 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 discharging valve is installed.
6. the device that processing low-temperature rectisol raw gas chilldown system pressure reduction according to claim 1 raises is characterized in that being provided with heat traced pipeline on wash water pipe and knockout drum.
7. handle the method that low-temperature rectisol raw gas chilldown system pressure reduction raises for one kind, it is characterized in that this method is provided with A, B two cover raw gas chilldown systems, and 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 bottom condensate liquid drain pipe valve, close A system knockout drum bottom condensate liquid 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, pressure release is closed to 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 desalted water of A, close discharging valve;
The f.A system reserve.
8. the method that processing low-temperature rectisol raw gas chilldown system pressure reduction according to claim 7 raises is characterized in that described flushing continues 8～10 hours.
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Cited By (4)
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| CN105779026A (en) * | 2016-03-11 | 2016-07-20 | 神华集团有限责任公司 | Methanol washing 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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| 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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|---|---|
| CN102003915B (en) | 2012-06-27 |
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