CN101591570A - A kind of method of chilling high-temperature synthesis gas - Google Patents
A kind of method of chilling high-temperature synthesis gas Download PDFInfo
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- CN101591570A CN101591570A CNA2009100437544A CN200910043754A CN101591570A CN 101591570 A CN101591570 A CN 101591570A CN A2009100437544 A CNA2009100437544 A CN A2009100437544A CN 200910043754 A CN200910043754 A CN 200910043754A CN 101591570 A CN101591570 A CN 101591570A
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- quench
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Abstract
The invention discloses a kind of method of chilling high-temperature synthesis gas, it is characterized in that: comprise the steps: 1. to contain the liquid slag high-temperature synthesis gas by 1100～2200 ℃ of fine coal suspended substance productions; 2. ashless saturated synthetic gas Quench according to 0.8～4.0 after heating up after the compression of Quench air compressor contains the liquid slag high-temperature synthesis gas than the chill zone Quench that enters vapourizing furnace, and its temperature is reduced to below 900 ℃; 3. the grey high-temperature synthesis gas that contains after the Quench further is cooled to 280～380 ℃ in waste heat boiler, removes remaining ash through dry ash strainer, water wash column, simultaneously the synthetic gas water is cooled to 130～190 ℃ of temperature of saturation; 4. the saturated synthetic gas of water wash column top exit partly enters and uses as Quench gas after the pressurization of Quench air compressor heats up.The present invention has simplified the chilling technology flow process, slows down Quench air compressor inlet duct corrosion speed and filter stoppage, reduces Quench gas consumption, saves Quench air compressor driving power.
Description
Technical field
The invention belongs to extensive pressing gas field, particularly a kind of method of chilling high-temperature synthesis gas.
Background technology
Pressurization fine coal gasification process use pure oxygen in pressurized-gasification furnace, to gasify fine coal suspended substance that rare gas element (N2/CO2) carries, production temperature be 1500～1700 ℃ contain the liquid slag high-temperature synthesis gas.Be this burst of Quench high-temperature synthesis gas, the chilling technology of Shell company is representative with patent EP0349090, Quench ratio according to 1～1.9 after this patent adopts the dried synthetic gas of one temperature between 200～220 ℃ to pressurize adds high-temperature synthesis gas, with its Quench to 900 ℃, so that the molten solids of carrying secretly in the high-temperature synthesis gas is condensed into flying dust, it is coalescent to avoid catching a cold on its downstream equipment.Contain grey synthetic gas after the Quench, enter conductive sections, the reverse chamber of gas, syngas cooler and be cooled to 300～350 ℃, reclaim heat by-product middle pressure steam simultaneously.Be cooled to after grey synthetic gas entered porcelain filter and removed most ashes 300～350 ℃ contain, enter that water wash column cools to that 160 ℃, washing are removed remaining ash content and by water-vapo(u)r saturation.
The most of ashless saturated synthetic gas of low temperature (160 ℃) of water wash column outlet enters the sulfur-resisting transformation unit.After water wash column exports containing micro-grey synthetic gas and mixing of 300～350 ℃ of parts that remaining ashless low temperature extracted out by the outlet of water-vapo(u)r saturation synthetic gas (160 ℃) and porcelain filter, enter the pressurization of Quench air compressor, send into vapourizing furnace Quench section then and be used for chilling high-temperature synthesis gas.
Quench air compressor inlet has two pipelines, and one is from the ashless saturated synthetic gas of the relative low temperature of water wash column (160 ℃), is designated hereinafter simply as " saturated gas "; Another is to cross hot synthesis gas from the trace ash that contains of the relatively-high temperature (300～350 ℃) of porcelain filter outlet, is designated hereinafter simply as " overheated gas ".
H takes place for preventing Quench air compressor inlet duct in the chilling technology of Shell company
2S condensate corrosion, ammonium chloride are sublimated, and (" saturated gas contains H in corrosion
2S ", contain H in " overheated gas "
2S, micro-HCl, flying dust and ammonia), require Quench air compressor inlet mixed synthesis gas to be in superheat state, temperature will be controlled between 200～220 ℃, therefore the mixed gas that assurance enters the Quench air compressor is higher than dew-point temperature, and the flow that is provided with this strand of temperature regulating and controlling valve regulation " overheated gas " at " overheated gas " pipeline of Quench air compressor inlet comes controlled chilling air compressor temperature in.Behind " overheated gas " pipelining temperature regulating and controlling valve, resistance ratios " saturated gas " pipeline of " overheated gas " pipeline obviously increases, hinder " overheated gas " and enter Quench air compressor inlet, cause Quench air compressor temperature in to be lower than controlled target, therefore, for guaranteeing that " overheated gas " pipeline has enough flows, at " saturated gas " pipeline pressure reduction regulating and controlling valve is set and increases " saturated gas " resistance of ducting.
In the chilling technology flow process of Shell company, the temperature regulating and controlling valve combined action of the pressure reduction regulating and controlling valve of " saturated gas " pipeline and " overheated gas " pipeline is controlled chilling air compressor temperature in accurately, guarantee that the mixed gas that enters the Quench air compressor is in superheat state, but actual motion shows, the corrosion that this can not controlled chilling air compressor inlet duct.When serious, drive just to have in four days 5 kilograms of dirts generations nearly, stop up Quench air compressor inlet filter, cause Quench air compressor inlet flow rate to reduce, device can't normally move, and has a strong impact on device long-term operation and economic benefit.
Mixing point and the corrosive pipeline situation in the 2m scope of downstream thereof at " saturated gas " pipeline and " overheated gas " pipeline are the most serious, and erosion rate surpasses 4mm/, the safe operation of serious threat Quench air compressor inlet duct.Domestic had the Shell coal gasifying process corrosion failure that installs pipes to cause a large amount of poisonous inflammable gas leakage incidents to take place.
Summary of the invention
In order to solve the problem of the corrosion of Quench air compressor inlet duct and suction port of compressor filter stoppage in the existing pressurization fine coal gasification process, the object of the present invention is to provide and a kind ofly can slow down Quench air compressor inlet duct corrosion speed and overcome Quench air compressor inlet filter blockage problem, assurance device safety, the method that prolongs the chilling high-temperature synthesis gas of the gasification installation cycle of operation.
The objective of the invention is to be achieved through the following technical solutions: 1. a kind of method of chilling high-temperature synthesis gas comprises the steps: to contain the liquid slag high-temperature synthesis gas by 1100～2200 ℃ of fine coal suspended substance productions; 2. ashless saturated synthetic gas Quench according to 0.8～4.0 after the compression of Quench air compressor contains the liquid slag high-temperature synthesis gas than the chill zone Quench that enters vapourizing furnace, and its temperature is reduced to below 900 ℃; 3. the grey high-temperature synthesis gas that contains after the Quench further is cooled to 280～380 ℃ in syngas cooler, removes remaining ash through dry ash strainer, water wash column, simultaneously the synthetic gas water is cooled to 130～190 ℃ of temperature of saturation; 4. the saturated synthetic gas of water wash column top exit is divided into 2 strands, and 1/5 ∽ 5/9 is the crude synthesis gas product, and remaining saturated synthetic gas uses as Quench gas after the pressurization of Quench air compressor heats up.
Described step 2. in the Quench ratio be 1.0～2.5, step 4. in saturated synthetic gas 2/7～1/2 be the crude synthesis gas product.
Described step 3. in saturated temperature be 150～180 ℃.
The present invention does not adopt " overheated gas " of objectionable constituent such as containing ammonium chloride, Iron sulfuret and dust to mix with " saturated gas ", but directly utilize clean " saturated gas " that be in the water-vapo(u)r saturation state after the washing as Quench gas, two pipelines with Quench air compressor inlet change a pipeline into simultaneously, keep " saturated gas " pipeline, cancellation " overheated gas " pipeline; " overheated gas " all enters water wash column; The temperature regulating and controlling valve and the Quench air compressor temperature in control loop of cancellation " overheated gas " pipeline; By strengthening companion's heat of Quench air compressor inlet tube, avoid " saturated gas " condensation in pipeline; Pressure reduction regulating and controlling valve, " saturated gas " pipeline pressure reduction control loop of cancellation " saturated gas " pipeline.
The present invention has cancelled " overheated gas ", eliminate Quench air compressor inlet duct because of the acid gas component in " overheated gas " runs into moisture in " saturated gas " to the deep-etching effect that pipeline causes, improved the security and the economy of device operation; " saturated gas " is through washing simultaneously, removed the composition that ammonium chloride etc. has desublimation, local corrosions such as underdeposit corrosion have been avoided, the fine and close Iron sulfuret protective layer that can effectively protect the reaction of hydrogen sulfide and pipeline material to generate, protection Quench air compressor inlet duct is not further corroded; Corrosion of Pipeline speed is less than 0.15 millimeter/year; " saturated gas " is through washing, removed and to have avoided solid impurity and the water-soluble compound of sublimating in tubing system, to deposit, avoided Quench air compressor inlet duct filter stoppage, avoided the instrument connecting pipe to stop up, avoid the valve on the pipeline stuck, guarantee the gasification installation long-term operation.
The present invention has simplified the chilling technology flow process, slows down Quench air compressor inlet duct corrosion speed and filter stoppage, reduces Quench gas consumption, saves Quench air compressor driving power.
Description of drawings
Fig. 1 is a process flow diagram of the present invention.
Embodiment
The invention will be further described according to specific embodiment below:
According to technical process shown in Figure 1, in 2000 tons of Shell pressurizations of day coal feeding amount gasifying powder coal device, enter the burner 8 of vapourizing furnace 1 by fine coal suspended substance 9, oxygen 10, the steam 11 of carbonic acid gas conveying, what 1100～2200 ℃ of partial oxidation reaction productions took place contains the liquid slag high-temperature synthesis gas, the up liquid slag high-temperature synthesis gas that contains is mixed with the ashless Quench gas 12 of the saturated mode of 60kg/s at the chill zone 2 of vapourizing furnace 1 and is reduced the temperature to below 900 ℃, and liquid slag is cured as ash.The grey high-temperature synthesis gas that contains after the Quench enters the syngas cooler of being made up of multistage coil pipe 3 and further is cooled to 280～380 ℃, simultaneously the middle pressure steam of by-product 54barg.Be cooled to 280～380 ℃ contain grey synthetic gas and enter dry ash strainer 4 and remove most dry ashes, isolated dry ash is discharged from dry ash strainer 4 bottoms.The synthetic gas of residual a small amount of dry ash enters water wash column 5 and removes remaining ash, and simultaneously the synthetic gas water being cooled to temperature of saturation and be 163 ℃, pressure is 3.78Mpag.The saturated synthetic gas of water wash column top exit is divided into 2 strands, synthetic gas 1/5～5/9 for the crude synthesis gas product enters sulfur-resisting transformation system 6, remaining saturated synthetic gas directly enter Quench air compressor 7 through Quench air compressor compression back afterwards the Quench according to 0.8～4.0 contain the liquid slag high-temperature synthesis gas than chill zone 2 Quench that enter vapourizing furnace 1.
According to technical process shown in Figure 1, in 2000 tons of Shell pressurizations of day coal feeding amount gasifying powder coal device, enter the burner 8 of vapourizing furnace 1 by fine coal suspended substance 9, oxygen 10, the steam 11 of nitrogen conveying, what 1100～2200 ℃ of partial oxidation reaction productions took place contains the liquid slag high-temperature synthesis gas, the up liquid slag high-temperature synthesis gas that contains is mixed with the ashless Quench gas 12 of the saturated mode of 52kg/s at the chill zone 2 of vapourizing furnace 1 and is reduced the temperature to below 900 ℃, and liquid slag is cured as ash.The grey high-temperature synthesis gas that contains after the Quench enters syngas cooler or the waste heat boiler 3 be made up of multistage coil pipe and further is cooled to 280～380 ℃, simultaneously the middle pressure steam of by-product 54barg.Be cooled to 280～380 ℃ contain grey synthetic gas and enter dry ash strainer 4 and remove most dry ashes, isolated dry ash is discharged from dry ash strainer 4 bottoms.The synthetic gas of residual a small amount of dry ash enters water wash column 5 and removes remaining ash, and simultaneously the synthetic gas water being cooled to temperature of saturation and be 162 ℃, pressure is 3.69Mpag.The saturated synthetic gas of water wash column top exit is divided into 2 strands, 2/7～1/2 for the crude synthesis gas product enters sulfur-resisting transformation system 6, and remaining saturated synthetic gas directly enters Quench air compressor 7 Quench according to 1～2.5 after the compression of Quench air compressor and contains the liquid slag high-temperature synthesis gas than chill zone 2 Quench that enter vapourizing furnace 1.
Claims (3)
1, a kind of method of chilling high-temperature synthesis gas is characterized in that: comprise the steps: 1. to contain the liquid slag high-temperature synthesis gas by 1100～2200 ℃ of fine coal suspended substance productions; 2. ashless saturated synthetic gas Quench according to 0.8～4.0 after the compression of Quench air compressor contains the liquid slag high-temperature synthesis gas than the chill zone Quench that enters vapourizing furnace, and its temperature is reduced to below 900 ℃; 3. the grey high-temperature synthesis gas that contains after the Quench further is cooled to 280～380 ℃ in syngas cooler, removes remaining ash through dry ash strainer, water wash column, simultaneously the synthetic gas water is cooled to 130～190 ℃ of temperature of saturation; 4. the saturated synthetic gas of water wash column top exit is divided into 2 strands, and 1/5 ∽ 5/9 is the crude synthesis gas product, and remaining saturated synthetic gas directly uses as Quench gas after the compression of Quench air compressor.
2, method according to claim 1 is characterized in that: described step 2. in the Quench ratio be 1.0～2.5, step 4. in saturated synthetic gas 2/7～1/2 be the crude synthesis gas product.
3, method according to claim 1 is characterized in that: described step 3. in saturated temperature be 150～180 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2009100437544A CN101591570A (en) | 2009-06-20 | 2009-06-20 | A kind of method of chilling high-temperature synthesis gas |
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| CNA2009100437544A CN101591570A (en) | 2009-06-20 | 2009-06-20 | A kind of method of chilling high-temperature synthesis gas |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105087078A (en) * | 2015-09-08 | 2015-11-25 | 航天长征化学工程股份有限公司 | Indirect pyrolysis system and pyrolysis method thereof |
| CN114350414A (en) * | 2022-03-16 | 2022-04-15 | 中国华能集团清洁能源技术研究院有限公司 | Gasifier system and method for operating the same |
| CN114395423A (en) * | 2022-03-24 | 2022-04-26 | 中国华能集团清洁能源技术研究院有限公司 | Gasification furnace system and operation process thereof |
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2009
- 2009-06-20 CN CNA2009100437544A patent/CN101591570A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105087078A (en) * | 2015-09-08 | 2015-11-25 | 航天长征化学工程股份有限公司 | Indirect pyrolysis system and pyrolysis method thereof |
| CN114350414A (en) * | 2022-03-16 | 2022-04-15 | 中国华能集团清洁能源技术研究院有限公司 | Gasifier system and method for operating the same |
| CN114395423A (en) * | 2022-03-24 | 2022-04-26 | 中国华能集团清洁能源技术研究院有限公司 | Gasification furnace system and operation process thereof |
| CN114395423B (en) * | 2022-03-24 | 2022-06-03 | 中国华能集团清洁能源技术研究院有限公司 | Gasification furnace system and operation process thereof |
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Application publication date: 20091202 |