CN102564217A - Method and structure for cleaning water vapor system of Shell gasification furnace - Google Patents
Method and structure for cleaning water vapor system of Shell gasification furnace Download PDFInfo
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- CN102564217A CN102564217A CN2012100492308A CN201210049230A CN102564217A CN 102564217 A CN102564217 A CN 102564217A CN 2012100492308 A CN2012100492308 A CN 2012100492308A CN 201210049230 A CN201210049230 A CN 201210049230A CN 102564217 A CN102564217 A CN 102564217A
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Abstract
The invention discloses a method for cleaning a water vapor system of a Shell gasification furnace. The method comprises the following steps of: a, feeding water to a steam pocket; b, connecting a water outlet pipe of the steam pocket with a cooling water outlet of the gasification furnace by using a water inlet temporary pipe, connecting a cooling water inlet of the gasification furnace with a cooling water drainage pipe by using a water outlet temporary pipe; and c, opening a valve of the steam pocket to ensure that water in the steam pocket flows in from a condensed water outlet of the gasification furnace and flow outs from a condensed water inlet of the gasification so that backwashing is realized. According to the method, the gasification furnace is cleaned by using a backwashing method, therefore, impurities possibly re-generated in the water vapor system after a gasification furnace body and an external pipe are welded in a contact manner can be thoroughly removed, and for Lambda pipes on the membrane walls of the gasification furnace, impurities and dead angles in water vapor branch pipes are thoroughly cleaned. The stability of the gasification working condition of the Shell gasification furnace is ensured and the service life of the membrane wall of the gasification furnace is prolonged; and no Lambda pipes on the membrane walls are blocked, thus cleaning time and cost are saved.
Description
Technical field
Structure when the present invention relates to a kind of shell gasification furnace water-steam system cleaning method and cleaning.
Background technology
Shell gasification furnace water-steam system is the core of whole coal gasification apparatus; When violent non-completing combustion takes place and emits the synthesis gas up to 1500 ℃ in high pressure coal dust and pure oxygen in vaporizer; Boiler water in the drum gets in the membrane wall of vaporizer, Quench section, gas transmission conduit, back-mixing chamber and evaporimeter 1-3 through the water circulating pump forced circulation; Heat in the synthesis gas is changed away with the form that boiler water cycle is heated to pressure saturated vapor in the drum generation; Make high-temperature gas to reduce to below 340 ℃, to guarantee the security and stability of downstream unit in the syngas cooler outlet.These membrane walls are to be formed by the water pipe of the different material of 927 Gents (the about 19.5-32mm of internal diameter) assembly welding, simultaneously for the flow in every water pipe of equilibrium, make membrane wall heat exchange best results, up to 887 water pipe interior welds restriction orifice.In sum, the cleannes of water-steam system can directly influence the stability of the gentle chemical industry condition of life-span of membrane wall, and the water-steam system pipeline must be cleaned out.Existing cleaning to the shell gasification furnace all is to adopt forward high pressure washing, and this purging method needs just can reach rinsing requirement 6-8 time, so not only time-consuming, water wasting, take can, and the employing operation with high pressure is very serious to the infringement of equipment.Existing this purging method simultaneously also can't be gone out by the foreign material that volume is bigger; Along with the accumulation often will be stopped up the water pipe that constitutes membrane wall; The membrane wall that at this moment just need change obstruction maybe cuts this membrane wall and cleans, and can further increase correlative charges, time like this.
Summary of the invention
The technical problem that the present invention will solve is, providing a kind of can draw mother to reach pipe to the gasification burner membrane wall, and foreign material and dead angle in the steam arm are cleared up completely; Guarantee the stability and the shell gasification furnace water-steam system cleaning method in the life-span that prolongs the gasification furnace membrane wall of shell gasification furnace gasification operating mode and structure when cleaning, can overcome the deficiency of prior art.
Technical scheme of the present invention is: shell gasification furnace water-steam system cleaning method, and it comprises following process:
A, on the drum of shell gasification furnace water-steam system water, water level accounts for more than 80% of total measurement (volume) in drum;
B, the outlet pipe that utilizes water inlet temporarily to manage drum are connected with the cooling water outlet of gasification furnace, utilize the interim pipe of water outlet that the cooling water intake of gasification burner is connected with the cooling water drainpipe; With high pressure nitrogen drum is pressurized to 0.7 to 0.8MPa.
C, open the drum valve, the water in the drum is flowed into by the condensed water delivery port of gasification furnace, flow out, realize back flush from the condensed water water inlet of gasification furnace;
D, treat that flushing finishes after, remove the interim pipe of water inlet manage temporarily with water outlet, recover the connection of shell gasification furnace water-steam system.
A-c step repetitive operation 2-4 time.
The interim pipe of water inlet is identical with the interim caliber of managing of water outlet, is connected with Pressure gauge respectively on the pipe at the interim pipe of water inlet with water outlet temporarily, when the pressure reduction on interim pipe of water inlet and the interim pipe of water outlet is 0.1-0.2Mpa, can stop flushing.
It comprises cooling water intake, delivery port and the cooling water drainpipe of drum, gasification furnace, gasification furnace; Between the delivery port of the discharge outlet of drum and gasification furnace, be connected with into water and manage temporarily, between the cooling water intake of gasification furnace and cooling water drainpipe, be connected with water outlet and manage temporarily.
On interim pipe of water inlet and the interim pipe of water outlet, be connected with Pressure gauge respectively.
Compare with prior art; The present invention cleans gasification furnace through the method for back flush; After can removing gasification furnace body and outer tube so completely and bumping pipe welding; The foreign material that possibly produce again in the water-steam system draw mother to reach pipe to the gasification burner membrane wall, and foreign material and dead angle in the steam arm are cleared up completely.Guarantee the stability and the life-span that prolongs the gasification furnace membrane wall of shell gasification furnace gasification operating mode, it is stifled to guarantee that membrane wall draws mother to reach Guan Yigen, practices thrift scavenging period and cost.The present invention also can improve membrane wall heat exchange effect, guarantees the security and stability of downstream unit, has shortened the coal gasification time installation, can normally move by assurance device, prolongs the service life of equipment, has good economy, society and environmental benefit.
Description of drawings
Pipeline when Fig. 1 cleans for the present invention connects sketch map.
The specific embodiment
Embodiments of the invention:
Shell gasification furnace water-steam system cleaning method comprises following process:
A, on the drum 1 of shell gasification furnace water-steam system water, water level accounts for more than 80% of total measurement (volume) in drum 1;
B, the interim pipe of utilization water inlet 6 outlet pipes with drum 1 are connected with the cooling water outlet 4 of gasification furnace 2, utilize interim 7 cooling water intakes 3 with gasification burner 2 of managing of water outlet to be connected with cooling water drainpipe 5; With high pressure nitrogen drum is pressurized to 0.7 to 0.8MPa.
C, open drum 1 valve, the water in the drum 1 is flowed into by the condensed water delivery port 4 of gasification furnace 2, flow out, realize back flush from the condensed water water inlet 3 of gasification furnace 2;
D, treat that flushing finishes after, remove interim pipe 6 of water inlet and the interim pipe 7 of water outlet, the water-steam system that recovers shell gasification furnace 2 connects.
The repetitive operation of above-mentioned a-c step can be accomplished flushing 2-4 time.
The interim pipe 6 of water inlet that its concrete detection index also can adopt identical caliber manages 7 with water outlet is interim; Be connected with Pressure gauge respectively on the pipe 7 at the interim pipe 6 of water inlet with water outlet temporarily; When the pressure reduction on interim pipe of water inlet and the interim pipe of water outlet is 0.1-0.2Mpa, can stop flushing.
The shell gasification furnace water-steam system cleaning method of the present invention enforcement that goes into operation August 24 to September 2 in 2009, the working time amounts to 117 hours (owing to termination of pumping during the reason of recirculated water 3 times).As the maximum bright spot of company water-steam system cleaning, during dismounting water circulating pump filter twice, the welding slag that main foreign material are iron rust and bulk is found and cleared up to cleaning drum twice.
Carry out in the process in anti-circulation; The maximum thorny problem that occurs is exactly that battery limit (BL) boiler water filter is broken through; Cause from the foreign material such as welding slag of out-of-bounds coming and get into drum; Water-steam system is caused secondary pollution, therefore connect interim air duct drum to boiler water battery limit (BL) pipeline has been carried out purging once more at dum boiler water valve valve waterborne place, and very fast target practice and qualified.
The present invention includes following process:
The first, send desalted water to system, and through control dum boiler water valve waterborne water on drum.
Second; Open the preceding pouring of leading of interim suction line butterfly valve of water circulating pump and filter and be the water circulating pump pump priming; To lead pouring when leading before the filter after normal desalted water is stablized in the pouring discharge and close, not have the desalted water discharge, then should continue through controlling dum boiler water valve waterborne water on drum if leading before the filter drenched; After the water circulating pump pump priming is accomplished, middle pressure drum liquid level finally is controlled at about 80% (being that water level exceeds drum carbonated drink inlet tube).
The 3rd, start water circulating pump, slowly open the water circulating pump outlet valve, the final aperture of outlet valve is no more than 30A with control circulation-water pump electric machine electric current and is as the criterion.
The 4th, when central pressure water circulating pump filter pressure reduction indication reached 0.1Mpa, the stoppage in transit water circulating pump cleaned inlet filter.
The 5th, open filter backwash valve (be balanced valve, prevent the water circulating pump counter-rotating)
The 6th, close the interim inlet tube butterfly valve of water circulating pump, water circulating pump is exported the stop valve standard-sized sheet.
In order to strengthen the filter backwash effect, the nitrogen valve that can open on the drum top is given the suitable drum punching press of giving, and opens the filter backwash valve then, continues to close backwash valve after about 15 minutes.
Press the indication of water circulating pump filter pressure reduction to change in the observation, if the pressure reduction indication goes to zero, then the filter backwash finishes; If it is little that the pressure reduction indication changes, then should continue to carry out repeatedly the 3rd operation.
If pass through filter backwash operation several times; The indication of middle pressure water circulating pump filter does not still have significant change; Then should close water circulating pump outlet valve and filter backwash valve (balanced valve), open water circulating pump discharging lead drench pressure release after, the filter cleaning is taken out in the contact maintenance.
The result shows; The contrary wash cycles of water-steam system is used for shell gasification furnace water-steam system cleaning method; Shortened the water-steam system scavenging period greatly; The foreign material and the dead angle of not only drawing mother to reach in pipe, the steam arm membrane wall have obtained cleaning completely, and it is not stifled to have realized drawing in SHELL water/vapour system cleaning mother to reach Guan Yigen.Water flux has all reached the requirement of SHELL in the membrane wall pipe; Having prolonged membrane wall draws mother to reach the service life of pipe; Have good economy, society and environmental benefit, the contrary wash cycles of water-steam system has reference and directive significance in the application of shell gasification furnace water-steam system cleaning method to similar chemical project.
Claims (5)
1. shell gasification furnace water-steam system cleaning method, it is characterized in that: it comprises following process:
A, on the drum of shell gasification furnace water-steam system water, water level accounts for more than 80% of total measurement (volume) in drum;
B, the outlet pipe that utilizes water inlet temporarily to manage drum are connected with the cooling water outlet of gasification furnace, utilize the interim pipe of water outlet that the cooling water intake of gasification burner is connected with the cooling water drainpipe;
C, open the drum valve, the water in the drum is flowed into by the condensed water delivery port of gasification furnace, flow out, realize back flush from the condensed water water inlet of gasification furnace;
D, treat that flushing finishes after, remove the interim pipe of water inlet manage temporarily with water outlet, recover the connection of shell gasification furnace water-steam system.
2. shell gasification furnace water-steam system cleaning method according to claim 1 is characterized in that: a-c step repetitive operation 2-4 time.
3. shell gasification furnace water-steam system cleaning method according to claim 1; It is characterized in that: the interim pipe of water inlet is identical with the caliber of the interim pipe of water outlet; Be connected with Pressure gauge respectively on the pipe at the interim pipe of water inlet with water outlet temporarily; When the pressure reduction on interim pipe of water inlet and the interim pipe of water outlet is 0.1-0.2Mpa, can stop flushing.
4. structure when shell gasification furnace water-steam system as claimed in claim 1 cleans; It comprises cooling water intake (3), delivery port (4) and the cooling water drainpipe (5) of drum (1), gasification furnace (2), gasification furnace; It is characterized in that: between the delivery port (4) of the discharge outlet of drum (1) and gasification furnace (2), be connected with into water and manage (6) temporarily, between the cooling water intake (3) of gasification furnace (2) and cooling water drainpipe (5), be connected with water outlet and manage (7) temporarily.
5. structure when shell gasification furnace water-steam system according to claim 4 cleans is characterized in that: manage in intake interim pipe (6) and water outlet temporarily and be connected with Pressure gauge on (7) respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100492308A CN102564217A (en) | 2012-02-29 | 2012-02-29 | Method and structure for cleaning water vapor system of Shell gasification furnace |
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| CN2012100492308A CN102564217A (en) | 2012-02-29 | 2012-02-29 | Method and structure for cleaning water vapor system of Shell gasification furnace |
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| CN102564217A true CN102564217A (en) | 2012-07-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104677183A (en) * | 2015-01-12 | 2015-06-03 | 国家电网公司 | Novel chemical dynamic cleaning process of power station steam drum boiler |
| CN104896970A (en) * | 2014-03-07 | 2015-09-09 | 四平市中亚热工环保设备制造有限公司 | On-line back flushing residue water afterheat heat exchange device |
| CN110132046A (en) * | 2018-02-09 | 2019-08-16 | 三菱日立电力系统株式会社 | Chemically-cleaning device and the chemical cleaning method for having used the chemically-cleaning device |
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- 2012-02-29 CN CN2012100492308A patent/CN102564217A/en active Pending
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| EP0551936A2 (en) * | 1990-09-14 | 1993-07-21 | Taprogge Gesellschaft mbH | Method and apparatus for detecting the flow spud of the cooling water in a heat exchanger for determining the cleaning efficiency of cleaning bodies |
| JPH1114294A (en) * | 1997-06-26 | 1999-01-22 | Takaoka Electric Mfg Co Ltd | Method and apparatus for cleaning air-cooled heat exchanger for stationary induction electric equipment |
| JP2002081890A (en) * | 2000-08-31 | 2002-03-22 | Hitachi Ltd | Cooling water cooler and its cleaning method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104896970A (en) * | 2014-03-07 | 2015-09-09 | 四平市中亚热工环保设备制造有限公司 | On-line back flushing residue water afterheat heat exchange device |
| CN104896970B (en) * | 2014-03-07 | 2017-01-11 | 四平市中亚热工环保设备制造有限公司 | On-line back flushing residue water afterheat heat exchange device |
| CN104677183A (en) * | 2015-01-12 | 2015-06-03 | 国家电网公司 | Novel chemical dynamic cleaning process of power station steam drum boiler |
| CN110132046A (en) * | 2018-02-09 | 2019-08-16 | 三菱日立电力系统株式会社 | Chemically-cleaning device and the chemical cleaning method for having used the chemically-cleaning device |
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Application publication date: 20120711 |