CN108977236A - A kind of providing method of rectisol system and synthesis gas - Google Patents

A kind of providing method of rectisol system and synthesis gas Download PDF

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Publication number
CN108977236A
CN108977236A CN201810994082.4A CN201810994082A CN108977236A CN 108977236 A CN108977236 A CN 108977236A CN 201810994082 A CN201810994082 A CN 201810994082A CN 108977236 A CN108977236 A CN 108977236A
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China
Prior art keywords
methanol
section
tower
gas
flash
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CN201810994082.4A
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CN108977236B (en
Inventor
杨吉祥
黄斌
陈红杰
戴宁海
周吉亮
刘吉平
罗军浩
李龙
徐立冬
叶涛
黄苍锋
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China Energy Investment Corp Ltd
Shenhua Ningxia Coal Industry Group Co Ltd
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China Energy Investment Corp Ltd
Shenhua Ningxia Coal Industry Group Co Ltd
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Priority to CN201810994082.4A priority Critical patent/CN108977236B/en
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
    • C10K1/16—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with non-aqueous liquids
    • 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
    • B01D53/14—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 absorption
    • B01D53/18—Absorbing units; Liquid distributors therefor

Abstract

The invention discloses a kind of rectisol systems, including unchanged ventilation clean unit, conversion gas clean unit, F- T synthesis tracheae and methanol-fueled CLC tracheae；In addition, the present invention further correspondingly disclose a kind of methanol synthesis unit and F- T synthesis unit needed for synthesis gas providing method；The present invention in advance cleans the ammonia in unstripped gas with boiler feedwater, on the one hand saves methanol usage, on the one hand handles recyclable NH to containing ammonia solution3；Meanwhile can be by the ratio of adjusting conversion gas and unchanged ventilation, difference H needed for being configured to2The decontaminating syngas of/CO, which is sent, produces different chemical products to downstream battery limit (BL).

Description

A kind of providing method of rectisol system and synthesis gas
Technical field
The present invention relates to purified synthesis gas fields, more particularly to a kind of rectisol system and methanol synthesis unit With the providing method of synthesis gas needed for F- T synthesis unit.
Background technique
China's coal chemical technology reaches its maturity, however, in the technical process for producing chemical products as raw material using coal, to coal Gasification generate crude synthesis gas carry out gas purification process be inevitable because in crude synthesis gas containing great quantities of spare two The gases such as carbonoxide, a small amount of hydrogen sulfide, COS, NH3, these gases be to production process it is unfavorable, wherein sulfide will cause Catalyst poisoning in the production reaction of downstream, it is therefore necessary to be removed and be recycled.Currently, low temperature washing device for methanol is most Mature gas purification technique has been widely used in domestic and international synthesizing methanol, synthesis ammonia and coal gas body purification device, benefit With low-temp methanol to the characteristic of gas with various different solubility, realize to carbon dioxide, hydrogen sulfide, COS, NH3 etc. in synthesis gas The target of gas removal.
However, many coal chemical industry enterprises are reply turn of the market, usually existing methanol-fueled CLC now, and there is F- T synthesis, And the ratio of the H2/CO of existing rectisol system treated purification gas be it is certain, when downstream unit needs simultaneously If can not meet simultaneously when the synthesis gas of carried interest difference H2/CO ratio, it usually needs entrance by individual hydrogen or CO into Material is adjusted hydrogen-carbon ratio, but often due to unstripped gas deviates greatly, hydrogen needed for adjusting or CO charging are large-minded, it is difficult to realize Accurate control, influences synthetic effect.
It is lacked in addition, existing low temperature washing device for methanol there are methanol consumption amounts big, high production cost, gas purification degree are low etc. Point.Chinese invention patent 201610788088.7 discloses sour gas in a kind of low temperature washing device for methanol and a kind of abjection synthesis gas Method, a kind of low temperature washing device for methanol, including a feed gas separator, an absorption tower, a carbon dioxide product tower, one are provided Hydrogen sulphide concentration tower, a hot recycling tower, a methanol water tower and a tail gas washing tower are absorbed in unstripped gas by using low-temp methanol Carbon dioxide, hydrogen sulfide, the gases such as COS, NH3, pass through desorption and desorption and realize carbon dioxide product gas and other gases Separation, meanwhile, on the basis of using lean solution methanol, increases semi lean solution methanol as master and wash methanol, reduce production energy consumption.
But when NH3 content is higher in unstripped gas, it can lead that raw material gas purifying is unqualified, and gas purification degree is low；This skill simultaneously The ratio that art has purified the H2/CO of gas is certain, if when downstream unit needs the synthesis gas of carried interest difference H2/CO ratio simultaneously When, it is unable to meet production demand.
Summary of the invention
The purpose of the present invention is to provide the providing methods of a kind of rectisol system and synthesis gas, with realization device Steady efficient operation.
One aspect to achieve the above object, the invention adopts the following technical scheme:
A kind of rectisol system, including unchanged ventilation clean unit, conversion gas clean unit, F- T synthesis tracheae and Methanol-fueled CLC tracheae；Wherein,
The unchanged ventilation clean unit includes non-transformed gas Ammonic washing tower, the first heat exchange unit and non-transformed aspiration tower； Wherein, the non-transformed gas Ammonic washing tower is used to carry out countercurrent washing to unchanged ventilation using boiler water to remove in unchanged ventilation Ammonia；First heat exchange unit is for changing the unchanged ventilation from the non-transformed gas Ammonic washing tower in the first heat exchange unit Heat drop temperature；The non-transformed aspiration tower sets gradually unchanged ventilation prewashing section, non-transformed desulfurization section and unchanged from the bottom to top Take a breath decarbonization section, be separated by chimney tower tray between each section, for using spray methanol solution successively to from described first The unchanged ventilation of heat exchange unit carries out prewashing, desulfurization and carbonization treatment, and the non-transformed pneumatic transmission of obtained purification is entered the first heat exchange Unit carries out cold recovery；
The conversion gas clean unit includes conversion gas Ammonic washing tower, the second heat exchange unit and conversion gas absorption tower；Wherein, institute Conversion gas Ammonic washing tower is stated for carrying out countercurrent washing to conversion gas using boiler water to remove the ammonia in conversion gas；Described second Heat exchange unit exchanges heat cooling for making the conversion gas from the conversion gas Ammonic washing tower in the first heat exchange unit；The conversion gas Absorption tower sets gradually conversion gas prewashing section, desulfuration of shift gas section, the first decarbonization section of conversion gas and conversion gas second from the bottom to top Decarbonization section is separated between each section by chimney tower tray, for using spray methanol solution successively to from second heat exchange The conversion gas of unit carries out prewashing, desulfurization and carbonization treatment, and obtained purification is sent into the second heat exchange unit and is carried out Cold recovery；With
The F- T synthesis tracheae and methanol-fueled CLC tracheae be respectively used to receiving portion purification it is unchanged ventilation and it is Partial cleansing Conversion gas.
Rectisol system according to the present invention, it is preferable that the rectisol system further include poor methanol pipe and Half poor methanol pipe；The unchanged ventilation clean unit further includes the first delivery pump and the first cooler；The conversion gas purification is single Member further includes First Heat Exchanger, the second cooler and third cooler；Second decarbonization section of conversion gas is successively set from the bottom to top Set the first packing area, the second packing area and column plate area；Wherein,
The poor methanol pipe is used for respectively to the top of the non-transformed gas decarbonization section and conversion gas the second decarbonization section column plate The top conveying poor methanol in area is as spray methanol solution；The half poor methanol pipe is used for second decarbonization section of conversion gas first The top of packing area conveys half poor methanol as spray methanol solution；
First delivery pump is used to the methanol solution of the non-transformed gas decarbonization section bottom being sent into first cooler； First cooler is used to carry out the methanol solution from the first delivery pump cooling and is sent to the non-transformed desulfurization respectively Section top, it is described it is unchanged ventilation prewashing section the second packing area of top and the second decarbonization section of the conversion gas top conduct Spray methanol solution；
The First Heat Exchanger and the second cooler are used for successively to the first from second decarbonization section of conversion gas bottom Alcohol liquid cools down；
The third cooler is for cooling down the part methanol solution from first decarbonization section of conversion gas bottom Cool down and is sent to the top of the desulfuration of shift gas section and the top of the conversion gas prewashing section respectively as spray methanol solution.
Rectisol system according to the present invention, it is preferable that the unchanged ventilation clean unit further includes the first methanol Delivery pipe and the second methanol delivery pipe；Wherein, the first methanol delivery pipe is used for the non-transformed desulfurization section bottom Methanol solution is sent out；The second methanol delivery pipe is used to send out the methanol solution of the unchanged ventilation prewashing section bottom；
The conversion gas clean unit further includes third methanol delivery pipe, the 4th methanol delivery pipe and the conveying of the 5th methanol Pipe；Wherein, the third methanol delivery pipe is used to send out remaining methanol solution of first decarbonization section of conversion gas bottom；It is described 4th methanol delivery pipe is used to send out the methanol solution of desulfuration of shift gas section bottom；The 5th methanol delivery pipe is used for will The methanol solution of the conversion gas prewashing section bottom is sent out.
Rectisol system according to the present invention, it is preferable that the rectisol system further includes Mathanol regenerating list Member, for the first for having purified unchanged ventilation and conversion gas from the unchanged ventilation clean unit and conversion gas clean unit Alcohol is regenerated, to obtain poor methanol and half poor methanol.
Rectisol system according to the present invention, it is preferable that the Mathanol regenerating unit includes the first flash column, second Flash column, Analytic Tower, hot recycling tower, third heat exchange unit, methanol-water separating, tail gas washing tower, wherein
First flash column is used to carry out the methanol solution for coming the second methanol delivery pipe and the 5th methanol delivery pipe Flash distillation, to flash off the CO and H that absorb in methanol solution2；
Second flash column is used for defeated from the first methanol delivery pipe, third methanol delivery pipe and the 4th methanol The methanol solution of pipe is sent to be flashed, to isolate the carbon dioxide absorbed in methanol solution as carbon dioxide product gas；
The Analytic Tower is for handling the methanol solution from second flash column, to be further separated out methanol The carbon dioxide absorbed in liquid obtains half poor methanol and is enriched with the rich hydrogen sulfide methanol of hydrogen sulfide as carbon dioxide product gas Liquid；
After the hot recycling tower is used for flashing in rich hydrogen sulfide methanol solution and the first flash column from the Analytic Tower Remaining methanol solution is regenerated, with isolated hydrogen sulfide sour gas, poor methanol and water；
The third heat exchange unit is used to recycle the cooling capacity in the Mathanol regenerating unit with cooling at least partially from institute State the poor methanol of hot recycling tower；
The water and the tail gas washing tower that the methanol-water separating is used to isolate the hot recycling tower wash tail gas Water afterwards carries out rectification process, further to separate and recover methanol from water；
The tail gas washing tower be used for the water using the methanol-water separating tower bottom to the Mathanol regenerating unit to Emission is washed, the water after tail gas and washing tail gas to absorb the methanol carried secretly in tail gas, after being washed.
Rectisol system according to the present invention, it is preferable that first flash column be disposed with from the bottom to top every From II section of I sections of flash distillation and flash distillation, and first flash column is additionally provided with the first flash column heat exchanger outside；Wherein, described II sections of flash distillation of one flash column are used to flash the methanol solution for coming the second methanol delivery pipe and the 5th methanol delivery pipe； The first flash column heat exchanger is used to make the methanol solution of the II sections of bottoms of flash distillation from first flash column and the external world to be sent into Nitrogen exchange heat heating；I sections of first flash column are flashed with to the methanol solution from the first flash column heat exchanger；
Second flash column sets gradually I sections of flash distillation, II sections of flash distillation, III sections of flash distillation and carbon dioxide from the bottom to top and produces Product section, wherein second flash column flashes I sections, flashes and setting is isolated between II sections and its III sections of flash distillation, and described second dodges III sections of tower flash distillation is steamed to be split between its carbon dioxide product section by chimney tower tray,
And second flash column further includes the second flash column appendix, the second flash column perfusion tube, the second flash column Refeed line, the first carbon dioxide product tracheae, the second flash column cooler and the second flash column heat exchanger；
Wherein, the second flash column cooler is used to carry out the methanol solution from the third methanol delivery pipe cold But, second flash column flashes II sections for flashing to through the second flash column cooler methanol solution after cooling；
Second flash column flashes I sections and sets gradually packing area and column plate area, the first methanol conveying from the bottom to top The methanol solution discharge port of pipe is located at the column plate area top that second flash column flashes I sections, and the second flash column gas transmission is effective It send in second flash column to be flashed to II section of flash steam to I sections of second flash column flash distillation of column plate area, described the Two flash column heat exchangers be used to making methanol solution from the 4th methanol delivery pipe exchange heat cooling and by the methanol solution after cooling send to Second flash column flashes between I sections of packing area and column plate area；
Second flash column flashes III sections for cold through third heat exchange unit recycling from the Analytic Tower Methanol solution after amount is flashed；The second flash column carbon dioxide product section sets gradually packing area and column plate from the bottom to top Area,
The second flash column perfusion tube be used for by second flash column flash II sections of bottoms methanol solution send respectively to The column plate area top of the second flash column carbon dioxide product section and the Analytic Tower,
The second flash column refeed line is used to send the methanol solution for flashing I sections of bottoms from second flash column to institute Above the packing area for stating the second flash column carbon dioxide product section；The first carbon dioxide product tracheae is for will be through described the The carbon dioxide product pneumatic transmission that two flash column carbon dioxide product sections are handled goes out；
Rectisol system according to the present invention, it is preferable that the Analytic Tower set gradually from the bottom to top stripping I sections, II sections of stripping, re-absorption section, master wash flash zone, low pressure flash section and carbon dioxide product section, wherein the Analytic Tower strips I It is split between section, II sections of stripping and its re-absorption section by chimney tower tray, the Analytic Tower reabsorbs section, master washes flash distillation Setting is isolated between section, low pressure flash section and its carbon dioxide product section；And the first Analytic Tower is additionally provided with outside the Analytic Tower Delivery pump, the second Analytic Tower delivery pump, third Analytic Tower delivery pump and the 4th Analytic Tower delivery pump；
The Analytic Tower carbon dioxide product section is for dodging the methanol solution from the second flash column perfusion tube It steams, to obtain carbon dioxide flash steam；
The Analytic Tower low pressure flash section be used for the methanol solution from the Analytic Tower carbon dioxide product section bottom into Row flash distillation；
The Analytic Tower master washes flash zone for dodging to the methanol solution from the Analytic Tower low pressure flash section bottom It steams, to obtain half poor methanol；
The first Analytic Tower delivery pump is used to half poor methanol that the Analytic Tower master washes flash zone bottom being delivered to institute It states above the first packing area of the second decarbonization section of conversion gas adsorption tower as spray methanol；
The Analytic Tower reabsorbs section and sets gradually packing area and column plate area from the bottom to top, and be additionally provided with reabsorb section into Expects pipe, the re-absorption section feeding pipe from the methanol solution of the second flash column carbon dioxide product section bottom for that will convey Spray methanol is used as above section column plate area to reabsorbing；
The second Analytic Tower delivery pump is used to for the methanol solution for reabsorbing section bottom to be sent to the third heat exchange single Member recycling cooling capacity is flashed so as to the charging methanol solution for flashing III sections as second flash column；
II sections of the stripping for utilizing the gas through chimney tower tray from I sections of the stripping to from second flash distillation The methanol solution that tower flashes III sections of bottoms is stripped；
The third Analytic Tower delivery pump be used for make it is described stripping II section bottoms methanol solution successively through First Heat Exchanger with I sections of the stripping is returned after the heat exchange heating of second flash column heat exchanger；
I sections of the stripping nitrogen for being introduced using I pars infrasegmentalis is simultaneously stripped certainly from the first flash column heat exchanger With from the hot recycling tower and from the tower overhead gas of I section middle part introducings is stripped to successively being changed through First Heat Exchanger and the second flash column The methanol solution returned after hot device heat exchange heating is stripped；
The 4th Analytic Tower delivery pump is used to send out the methanol solution of described I sections of bottoms of stripping；
The hot recycling tower sets gradually Shuifu County's collection section, hydrogen sulfide stripping section and flash evaporation section from the bottom to top, wherein described Shuifu County's collection section is separated with hydrogen sulfide stripping section by chimney tower tray, and the hydrogen sulfide stripping section and the isolation of flash evaporation section are set It sets；The hydrogen sulfide stripping section sets gradually packing area and column plate area from the bottom to top；
Be additionally provided with outside the hot recycling tower hot recycling tower First Heat Exchanger, prewashing methanol heater, hot recycling tower return tank, Hot recycling tower reflux pump, the first delivery pump of hot recycling tower, the second delivery pump of hot recycling tower,
The flash evaporation section is used to heat up to exchanging heat through hot recycling tower First Heat Exchanger from the 4th Analytic Tower delivery pump Methanol solution flashed, and described in tower top pneumatic transmission that top obtains to the methanol solution that stripping I section middle parts, bottoms obtain is sent to Above the column plate area of hydrogen sulfide stripping section；
The hydrogen sulfide stripping section is used to strip top-down methanol solution using from methanol steam, with stripping Hydrogen sulfide in methanol solution out, to obtain sulfide hydrogen stripped product at the top of hydrogen sulfide stripping section, bottom obtains poor first Alcohol；
The prewashing methanol heater is used to make to flash the methanol solution of I sections of bottoms from first flash column and from institute The stripped product heat exchange heating of hydrogen sulfide stripping section is stated, and the methanol solution after heat exchange is sent to the hydrogen sulfide stripping section column plate area Top；The hot recycling tower return tank is used to carry out gas to the stripped product after prewashing methanol heater heat exchange cooling Liquid separation, and the methanol solution isolated is back to the hydrogen sulfide stripping section column plate area top；
First delivery pump of hot recycling tower be used for by the partial regeneration poor methanol of hydrogen sulfide stripping section bottom send to The hot recycling tower First Heat Exchanger exchanges heat with the methanol solution from the 4th Analytic Tower delivery pump to cool down；
The second delivery pump of hot recycling tower be used for by the partial regeneration poor methanol of hydrogen sulfide stripping section bottom send respectively to Shuifu County's collection section and methanol-water separating；
Described Shuifu County collects section and is used for Shuifu County's collection section reboiler using the collection mating setting of section of described Shuifu County to from hot recycling The part poor methanol of the second delivery pump of tower is boiled again to obtain methanol steam at the top of Shuifu County's collection section, obtain water in bottom；Institute Shuifu County's collection section delivery pump is stated to be used to the water of Shuifu County bottom Ji Duan being sent to methanol-water separating；
Rectisol system according to the present invention, it is preferable that the methanol-water separating is used for from described Shuifu County The water of the water and tail gas washing tower tower bottom that collect section delivery pump carries out rectifying to obtain methanol steam, including tower top methanol gas in tower top Pipe, poor methanol return pipe and the methanol-water separating reboiler with the mating setting of the methanol-water separating, wherein the tower top Methanol tracheae is used to for the tower top methanol steam being delivered to the middle part of hydrogen sulfide stripping section packing area；The poor methanol returns Flow tube is used to a part for the poor methanol that second delivery pump of hot recycling tower conveys being sent into the methanol-water separating Portion is as overhead reflux；
Sewage heat exchanger and sewage pump are additionally provided with outside the tail gas washing tower；The sewage heat exchanger is for making from described The water heat exchange of methanol-water separating tower bottom cools down and the water after cooling is delivered to the tail gas washing tower as washing water；
The tail gas washing tower is used to wash flash zone to the re-absorption section from the Analytic Tower, master using the washing water Countercurrent washing is carried out with the tail gas at the top of low pressure flash section and is sent out the tail gas after washing by tower top；The sewage pump is used for will Sewage after the interior washing tail gas of the tail gas washing tower is sent into sewage heat exchanger and carries out heat exchange heating so as to as the feeding first The aqueous solution of alcohol-water separation tower.
Rectisol system according to the present invention, it is preferable that the Mathanol regenerating unit further includes recycle gas compressor, For the top sudden strain of a muscle to I sections, I sections of I sections of the first flash column flash distillation and the second flash column flash distillation are flashed from first flash column Steam is pressurized and is recycled to the unchanged ventilation wait enter first heat exchange unit from the non-transformed gas Ammonic washing tower In.
Another aspect for achieving the above object, the present invention adopts the following technical scheme:
The providing method of synthesis gas needed for a kind of methanol synthesis unit and F- T synthesis unit, by the resulting rough coal of coal gasification Two strands are separated after gas dedusting, wherein one enters rectisol system as non-transformed pneumatic transmission and is purified unchanged ventilation, another Stock enter above-mentioned rectisol system as variation pneumatic transmission after transformation adjusts C/Hratio and be purified conversion gas；
The unchanged ventilation of a part purification and a part purification variation gas are mixed, to obtain and synthesis gas needed for F- T synthesis Synthesis gas of the gaseous mixture with essentially identical hydrogen-carbon ratio as F- T synthesis unit；
Another part is purified into unchanged ventilation and another part purification variation gas mixes, to obtain and conjunction needed for methanol-fueled CLC There is synthesis gas of the gaseous mixture of essentially identical hydrogen-carbon ratio as methanol synthesis unit at gas.
Compared with prior art, the invention has the following advantages that
1. establishing unchanged ventilation and conversion gas Ammonic washing tower, the ammonia in unstripped gas is cleaned in advance with boiler feedwater, one Aspect saves methanol usage, on the one hand handles recyclable NH3 to containing ammonia solution；Meanwhile by optimizing place to process flow Reason reduces methanol usage amount in gas purification process, efficiently uses system cooling capacity, reduces production cost；
2. by carrying out low-temp methanol simultaneously to conversion gas and unchanged ventilation and washing processing, can by adjusting conversion gas with it is unchanged The ratio of ventilation, the decontaminating syngas of difference H2/CO, which is sent, needed for being configured to produces different chemical products to downstream battery limit (BL).
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of embodiment of rectisol system of the invention, wherein each pipeline is each in figure It is disconnected at right-angled intersection between pipeline.
Specific embodiment
Below in conjunction with attached drawing, the present invention is described in detail, but it should be recognized that the present invention is not limited to this.
As shown in Figure 1, rectisol system of the invention include unchanged ventilation clean unit, conversion gas clean unit, F- T synthesis tracheae 7 and methanol-fueled CLC tracheae 8.
The unchanged ventilation clean unit includes non-transformed gas Ammonic washing tower 102, the first heat exchange unit 103 and non-transformed aspiration Receive tower 101；Wherein, the non-transformed gas Ammonic washing tower 102 is used to carry out countercurrent washing to unchanged ventilation using boiler water to remove Ammonia in unchanged ventilation；First heat exchange unit 103 is for making the unchanged ventilation from the non-transformed gas Ammonic washing tower 102 Exchange heat cooling in the first heat exchange unit 103；The non-transformed aspiration tower 101 sets gradually unchanged ventilation prewashing from the bottom to top Section 11, non-transformed desulfurization section 12 and non-transformed gas decarbonization section 13 are separated (i.e. chimney by chimney tower tray 10 between each section Air-flow below tower tray can be risen by it, and the liquid phase above chimney tower tray will not be declined by it), for utilizing spray first Alcohol liquid successively carries out prewashing, desulfurization and carbonization treatment to the unchanged ventilation from first heat exchange unit 103, and will obtain It purifies non-transformed pneumatic transmission and enters the first heat exchange unit 103 progress cold recovery (namely heating up with other material-heat-exchangings).In a reality It applies in example, the unchanged ventilation prewashing section 11, non-transformed desulfurization section 12 and non-transformed gas decarbonization section 13 are tower tray area, i.e., respectively Gas-liquid contact is realized by setting tower tray in section.
The conversion gas clean unit includes conversion gas Ammonic washing tower 201, the second heat exchange unit 202 and conversion gas absorption tower 203；Wherein, the conversion gas Ammonic washing tower 201 is used to carry out countercurrent washing to conversion gas using boiler water to remove in conversion gas Ammonia；Second heat exchange unit 202 is for making the conversion gas from the conversion gas Ammonic washing tower 201 in the first heat exchange unit Exchange heat cooling in 201；The conversion gas absorption tower 203 sets gradually conversion gas prewashing section 21, desulfuration of shift gas section from the bottom to top 22, the first decarbonization section of conversion gas 23 and the second decarbonization section of conversion gas 24 are separated between each section by chimney tower tray 10, are used for Prewashing, desulfurization and carbonization treatment successively are carried out to the conversion gas from second heat exchange unit 202 using spray methanol solution, and Obtained purification is sent into the second heat exchange unit 202 and carries out cold recovery.
The F- T synthesis tracheae and methanol-fueled CLC tracheae be respectively used to receiving portion purification it is unchanged ventilation and it is Partial cleansing Conversion gas.
In one embodiment, the rectisol system further includes poor methanol pipe 1 and half poor methanol pipe 2；It is described Unchanged ventilation clean unit further includes the first delivery pump 104 and the first cooler 105；The conversion gas clean unit further includes One heat exchanger 204, the second cooler 205 and third cooler 206；Second decarbonization section of conversion gas 24 is successively set from the bottom to top Set the first packing area 241, the second packing area 242 and column plate area 243；Wherein, the poor methanol pipe 1 is used for respectively to described unchanged The top for decarbonization section 13 of taking a breath and the top conveying poor methanol in conversion gas the second decarbonization section column plate area 243 are as spray methanol solution； The half poor methanol pipe 2 is used for that (namely conversion gas second to be de- to the top of the first packing area of second decarbonization section of conversion gas 241 Position between the first packing area of carbon section 241 and the second packing area of the second decarbonization section of conversion gas 242) half poor methanol is conveyed as spray Drench methanol solution；The poor methanol and half poor methanol are well known in the art, and which is not described herein again.
First delivery pump 104 is used to the methanol solution of non-transformed 13 bottom of gas decarbonization section being sent into described first cold But device 105；First cooler 105 is used to carry out the methanol solution from the first delivery pump 104 cooling and is sent to institute respectively State the top of non-transformed desulfurization section 12, the top of the unchanged ventilation prewashing section 11 and the second decarbonization section of the conversion gas the The top of two packing areas 242 is as spray methanol solution；The First Heat Exchanger 204 and the second cooler 205 are for successively to next It is cooled down from the methanol solution of 24 bottom of the second decarbonization section of conversion gas；The third cooler 206 is used for coming from The part methanol solution of 23 bottom of the first decarbonization section of conversion gas cools down and is sent to the desulfuration of shift gas section respectively 22 top and the top of the conversion gas prewashing section 21 are as spray methanol solution.In one embodiment, the conversion gas Prewashing section 21 and desulfuration of shift gas section 22 are tower tray area, and first decarbonization section of conversion gas 23 is packing area.
In one embodiment, the unchanged ventilation clean unit further includes the first methanol delivery pipe 106 and the second first Alcohol delivery pipe 107；Wherein, the first methanol delivery pipe 106 is used for the methanol solution of non-transformed 12 bottom of desulfurization section It sends out；The second methanol delivery pipe 107 is used to send out the methanol solution of unchanged ventilation 11 bottom of prewashing section；
The conversion gas clean unit further includes third methanol delivery pipe 209, the 4th methanol delivery pipe 210 and the 5th methanol Delivery pipe 211；Wherein, the third methanol delivery pipe 209 is used for remaining first of 23 bottom of the first decarbonization section of conversion gas Alcohol liquid (removes remaining methanol after entering third cooler 206 in the methanol solution i.e. from 23 bottom of the first decarbonization section of conversion gas Liquid) it sends out；The 4th methanol delivery pipe 210 is used to send out the methanol solution of 22 bottom of desulfuration of shift gas section；Described Five methanol delivery pipes 211 are used to send out the methanol solution of 21 bottom of conversion gas prewashing section.
In one embodiment, the rectisol system further includes Mathanol regenerating unit, for from described Unchanged take a breath that purified of unchanged ventilation clean unit and conversion gas clean unit is regenerated with the methanol of conversion gas, to obtain Poor methanol and half poor methanol (make full use of half poor methanol, advantageously reduce the load of Mathanol regenerating unit, is energy-saving).It is described Mathanol regenerating unit includes the first flash column 606, the second flash column 303, Analytic Tower 405, hot recycling tower 501, third heat exchange list Member 406, methanol-water separating 602 and tail gas washing tower 605.
Wherein, first flash column 606 is used for the next second methanol delivery pipe 107 and the 5th methanol delivery pipe 211 methanol solution is flashed, to flash off the CO and H2 that absorb in methanol solution.In one embodiment, first flash distillation (flashing I sections cannot with II sections of flash distillation for the flash distillation I section 610 and flash distillation II section 620 that tower 606 is disposed with isolation from the bottom to top Mass transfer is directly carried out without the pipeline being especially arranged), and the heat exchange of the first flash column is additionally provided with outside first flash column 606 Device 607；Wherein, the first flash column flash distillation II section 620 is used for defeated to the next second methanol delivery pipe 107 and the 5th methanol The methanol solution of pipe 211 is sent to be flashed；The first flash column heat exchanger 607 flashes II from first flash column for making The methanol solution of 620 bottoms of section and the extraneous nitrogen being sent into exchange heat and heat up；The first flash column flash distillation I section 610 is with to from institute The methanol solution for stating the first flash column heat exchanger 607 is flashed.It will be appreciated by those skilled in the art that first flash column flashes II Section 620 and the first flash column flash distillation I section 610 can be packing section.
Second flash column 303 is used for from the first methanol delivery pipe 106,209 and of third methanol delivery pipe The methanol solution of 4th methanol delivery pipe 210 is flashed, to isolate the carbon dioxide absorbed in methanol solution as carbon dioxide Product gas.In one embodiment, second flash column 303 sets gradually flash distillation I section 310, II sections of flash distillation from the bottom to top 320, III section 330 and carbon dioxide product section 340 are flashed, wherein the second flash column flash distillation I section 310, flash distillation II section 320 And its setting is isolated between flash distillation III section 330, the second flash column flash distillation III section 330 and its carbon dioxide product section 340 Between be split by chimney tower tray, and second flash column 303 further includes the second flash column appendix 350, second Flash column perfusion tube 360, the second flash column refeed line 370, the first carbon dioxide product tracheae 380, the second flash column cooler 208 and the second flash column heat exchanger 207；Wherein, the second flash column cooler 208 is used for defeated from the third methanol The methanol solution of pipe 209 is sent to be cooled down, the second flash column flash distillation II section 320 (packing section) to through described second for flashing The methanol solution after cooling of tower cooler device 208 is flashed；The second flash column flash distillation I section 310 is set gradually from the bottom to top fills out Expect area and column plate area, the methanol solution discharge port of the first methanol delivery pipe 106 is located at second flash column flash distillation I section 310 Column plate area above, the second flash column appendix 350 be used for by second flash column flash distillation II section 320 flash steam give To the column plate area of second flash column flash distillation I section 310, the second flash column heat exchanger 207 is for making from tetramethyl The methanol solution heat exchange cooling of alcohol delivery pipe 210 simultaneously send the methanol solution after cooling to filling out to second flash column flash distillation I section 310 Expect between area and column plate area；Second flash column flash distillation III section 330 (packing section) is used for from the Analytic Tower 405 Methanol solution after the third heat exchange unit 406 recycles cooling capacity is flashed；The second flash column carbon dioxide product section 340 set gradually packing area and column plate area from the bottom to top, and the second flash column perfusion tube 360 is used for second flash column The methanol solution of flash distillation 320 bottom of II section send respectively above the column plate area to the second flash column carbon dioxide product section 340 with The Analytic Tower 405；The second flash column refeed line 370 will be for that will flash 310 bottom of I section from second flash column Methanol solution is sent to the packing area of the second flash column carbon dioxide product section 340；The first carbon dioxide product gas Pipe 380, which is used to that obtained carbon dioxide product pneumatic transmission will to be handled through the second flash column carbon dioxide product section 340, to be gone out.
The Analytic Tower 405 is for handling the methanol solution from second flash column 303, further to separate The carbon dioxide absorbed in methanol solution out obtains half poor methanol and is enriched with the rich hydrogen sulfide of hydrogen sulfide as carbon dioxide product gas Methanol solution.In one embodiment, the Analytic Tower 405 sets gradually stripping I section 410 from the bottom to top, strips II section 420, again Absorber portion 430, master wash flash zone 440, low pressure flash section 450 and carbon dioxide product section 460, wherein the Analytic Tower strips I It is separated between section 410, stripping II section 420 and its re-absorption section 430 by chimney tower tray, the Analytic Tower reabsorbs section 430, setting is isolated in main wash between flash zone 440, low pressure flash section 450 and its carbon dioxide product section 460；And the parsing The first Analytic Tower delivery pump 401, the second Analytic Tower delivery pump 402, third Analytic Tower delivery pump 403 and the are additionally provided with outside tower 405 Four Analytic Tower delivery pumps 404；The Analytic Tower carbon dioxide product section 460 (packing section) is used for from second flash column The methanol solution of perfusion tube 360 is flashed, to obtain carbon dioxide product gas；450 (the filler of Analytic Tower low pressure flash section Section) for being flashed to the methanol solution from 460 bottom of Analytic Tower carbon dioxide product section；The Analytic Tower master washes sudden strain of a muscle Section 440 (packing section) is steamed for flashing to the methanol solution from 450 bottom of Analytic Tower low pressure flash section, to obtain half Poor methanol；Half poor methanol that the first Analytic Tower delivery pump 401 is used to wash the Analytic Tower master 440 bottom of flash zone conveys As spray methanol above to the first packing area 241 of second decarbonization section of conversion gas 24；The Analytic Tower reabsorbs section 430 Packing area and column plate area are set gradually from the bottom to top, and are additionally provided with and are reabsorbed section feeding pipe 431, the re-absorption section feeding pipe 431 inhale again for the methanol solution from 340 bottom of the second flash column carbon dioxide product section to be delivered to the Analytic Tower It receives above 430 column plate area of section as spray methanol；The second Analytic Tower delivery pump 402 is used for 430 bottom of re-absorption section The methanol solution in portion is sent to the third heat exchange unit 406 and recycles cooling capacity so as to as second flash column flash distillation III section 330 Charging methanol solution is flashed；The stripping II section 420 (column plate section) is used to come from I sections of the stripping using through chimney tower tray 410 gas strips the methanol solution from second flash column flash distillation, 330 bottom of III section；The third Analytic Tower Delivery pump 403 is used to make the methanol solution of stripping 420 bottom of II section successively through First Heat Exchanger 204 and the second heat exchange of flash evaporation device The stripping I section 410 is returned after 207 heat exchange heatings；The stripping I section 410 (column plate section) is used to dodge using from described first It steams tower heat exchanger 607 and draws from the nitrogen for stripping the introducing of I pars infrasegmentalis and from the hot recycling tower 501 and from I sections of middle parts are stripped The tower overhead gas entered carries out the methanol solution successively returned after First Heat Exchanger 204 and the heat exchange heating of the second heat exchange of flash evaporation device 207 Stripping；The 4th Analytic Tower delivery pump 404 is used to send out the methanol solution of stripping 410 bottom of I section.
The hot recycling tower 501 is used for rich hydrogen sulfide methanol solution and the first flash column 606 from the Analytic Tower 405 Remaining methanol solution is regenerated after middle flash distillation, with isolated hydrogen sulfide sour gas, poor methanol and water.In one embodiment In, the hot recycling tower 501 sets gradually Shuifu County's collection section 510, hydrogen sulfide stripping section 520 and flash evaporation section 530 from the bottom to top, In, Shuifu County's collection section 510 is separated with hydrogen sulfide stripping section 520 by chimney tower tray, 520 He of hydrogen sulfide stripping section The isolation setting of flash evaporation section 530；The hydrogen sulfide stripping section 520 sets gradually packing area and column plate area from the bottom to top；The heat Hot recycling tower First Heat Exchanger 504, prewashing methanol heater 509, hot recycling tower return tank 508, heat are additionally provided with outside regenerator 501 Regenerator reflux pump 507, the first delivery pump of hot recycling tower 505 and the second delivery pump of hot recycling tower 506；The flash evaporation section 530 (packing section) is used for the methanol through the heat exchange heating of hot recycling tower First Heat Exchanger 504 from the 4th Analytic Tower delivery pump 404 Liquid is flashed, and tower top pneumatic transmission to the methanol solution that 410 middle part of stripping I section, bottom obtain that top obtains is sent to the sulphur Above the column plate area for changing hydrogen stripping section 520；The hydrogen sulfide stripping section 520 is used to utilize from methanol steam to top-down Methanol solution is stripped, the hydrogen sulfide in methanol solution is stripped off, to obtain sulfide hydrogen at the top of hydrogen sulfide stripping section Stripped product, bottom obtain poor methanol；The prewashing methanol heater 509 flashes I sections from first flash column for making The methanol solution of 610 bottoms exchanges heat with the stripped product from the hydrogen sulfide stripping section 520 and heats up, and by the methanol solution after heat exchange It is sent to the top in the 520 column plate area of hydrogen sulfide stripping section；The hot recycling tower return tank 508 is used for through the prewashing methanol Stripped product after the heat exchange cooling of heater 509 carries out gas-liquid separation, and the methanol solution isolated is back to the hydrogen sulfide 520 column plate area top of stripping section；First delivery pump of hot recycling tower 505 is used for 520 bottom of hydrogen sulfide stripping section Partial regeneration poor methanol is sent to the hot recycling tower First Heat Exchanger 504 and the methanol solution from the 4th Analytic Tower delivery pump 404 Heat exchange cooling；The second delivery pump of hot recycling tower 506 is used for the partial regeneration poor methanol of 520 bottom of hydrogen sulfide stripping section (such as remaining poor methanol in addition to the poor methanol that the first delivery pump of hot recycling tower 505 is conveyed), which is sent respectively to described Shuifu County, collects section 510 and methanol-water separating 602；Shuifu County's collection section 510 is used to collect section again using Shuifu County of described Shuifu County collection mating setting of section Boiling device 503 boils again to obtain at the top of Shuifu County's collection section 510 the part poor methanol from the second delivery pump of hot recycling tower 506 Methanol steam obtains water in bottom；Shuifu County's collection section delivery pump 502 is used to the water of Shuifu County bottom Ji Duan510 being sent to methanol Water separation column；
The third heat exchange unit 406 be used to recycle cooling capacity in the Mathanol regenerating unit with it is cooling at least partially from The poor methanol of the hot recycling tower 501.In one embodiment, the third heat exchange unit 406 is for making from the heat again The poor methanol of raw tower First Heat Exchanger 504 and the methanol solution of the second Analytic Tower delivery pump 402 exchange heat and cool down.
The methanol-water separating 602 is used for the water and the tail gas washing tower 605 isolated to the hot recycling tower 501 Water after washing tail gas carries out rectification process, further to separate and recover methanol from water.In one embodiment, the methanol Water separation column 602 is used to carry out rectifying to the water of 605 tower bottom of water and tail gas washing tower from described Shuifu County collection section delivery pump 502 To obtain methanol steam in tower top, including tower top methanol tracheae 630, poor methanol return pipe 640 and with the methanol-water separating The methanol-water separating reboiler 601 of mating setting, wherein the tower top methanol tracheae 630 is used to steam the tower top methanol Vapour is delivered to the middle part of 520 packing area of hydrogen sulfide stripping section；The poor methanol return pipe 640 is used for the hot recycling tower A part (remainder in addition to the poor methanol for entering Shuifu County's collection section 510) of the poor methanol of second delivery pump 506 conveying is sent into The top of the methanol-water separating 602 is as overhead reflux.
The tail gas washing tower 605 is used for the tower bottom water using the methanol-water separating 602 to the Mathanol regenerating list The tail gas to be discharged of member is washed, to absorb the methanol carried secretly in tail gas, after the tail gas and washing tail gas after being washed Water.In one embodiment, sewage heat exchanger 603 and sewage pump 604 are additionally provided with outside the tail gas washing tower 605 (packed tower)； The sewage heat exchanger 603 is used to making water from 602 tower bottom of methanol-water separating to exchange heat cooling and by the water after cooling The tail gas washing tower 605 is delivered to as washing water；The tail gas washing tower 605 is using the washing water to from the solution Analyse the re-absorption section 430 of tower, master washes flash zone 440 and the top tail gas of low pressure flash section 450 carries out countercurrent washing and by tower top Tail gas after washing is sent out；The sewage pump 604 is used to for the sewage after washing tail gas in the tail gas washing tower 605 being sent into Sewage heat exchanger 603 carries out heat exchange heating so as to as the aqueous solution for being sent into the methanol-water separating 602.
In one embodiment, the Mathanol regenerating unit further includes recycle gas compressor 608, for from described First flash column flashes the top flash steam of I section 610, the first flash column flash distillation II section 620 and the second flash column flash distillation I section 310 Be pressurized and be recycled to from the non-transformed gas Ammonic washing tower 102 wait enter first heat exchange unit 103 it is non-transformed In gas.
To realize while providing required synthesis gas for methanol synthesis unit and F- T synthesis unit, in the present invention, by coal Gasify and separate two strands after resulting raw gas dedusting, according to above-mentioned low-temp methanol system, wherein one directly makees without transformation Enter low-temp methanol for non-transformed pneumatic transmission and wash unit to be purified unchanged ventilation, another stock carries out transformation and adjusts after C/Hratio as becoming Change pneumatic transmission to enter the low-temp methanol and wash unit to be purified conversion gas；By the unchanged ventilation of a part purification and a part purification variation Gas mixing, to obtain having the gaseous mixture of essentially identical hydrogen-carbon ratio as F- T synthesis unit with synthesis gas needed for F- T synthesis Synthesis gas；Another part is purified into unchanged ventilation and another part purification variation gas mixes, to obtain and conjunction needed for methanol-fueled CLC There is synthesis gas of the gaseous mixture of essentially identical hydrogen-carbon ratio as methanol synthesis unit at gas.In the present invention, by required synthesis The hydrogen-carbon ratio of gas is set as Y, the difference that " essentially identical " both refers within ± 10% X Y, preferably ± 5% X Y, more preferably ± Within 1% X Y.
The unstripped gas come from upstream gasification unit is divided into the higher conversion gas of H2/CO and the relatively low unchanged ventilation of H2/CO: not Conversion gas enters the non-transformed gas Ammonic washing tower 102, carries out washing using boiler feedwater and removes NH3 therein, top gaseous phase object Matter enters the non-transformed aspiration tower 101 after discharging heat, from lower part.The non-transformed aspiration tower 101 is from bottom to top Three sections unchanged ventilation is washed using carbon dioxide enriched methanol, the carbon dioxide enriched methanol of supercooling and poor methanol is subcooled, tower (i.e. non-transformed unstripped gas is non-transformed in the purification of the first heat exchange unit 103 and low temperature after released cold quantity for the qualified unchanged ventilation in top Gas and the carbon dioxide product gas at the top of Analytic Tower carry out counterflow heat exchange heating) it is sent into the unchanged each branch pipe of ventilation of purification；
Conversion gas enters the conversion gas Ammonic washing tower 201, carries out washing using boiler feedwater and removes NH3 therein, tower top Gaseous substance enters the conversion gas absorption tower 203 from lower part and washs to conversion gas, tower top closes after 202 release heats (i.e. transformation unstripped gas is in the purification of the second heat exchange unit 202 and low temperature and from the after released cold quantity for case transformation gas The carbon dioxide product gas at two flash columns, 303 top carries out counterflow heat exchange heating) it is sent into each branch pipe of purification, pass through adjusting The purification ratio non-transformed with purification, the decontaminating syngas of difference H2/CO ratio needed for being configured to are sent to downstream battery limit (BL). Specifically, it purifies unchanged ventilation and purification is all divided into two branches, the non-transformed synthesis gas of the purification of a branch and net Change conversion gas to be mixed by flow control, this strand of gas sends out battery limit (BL) as methyl methanol syngas, another branch mixes Go out battery limit (BL) as F- T synthesis pneumatic transmission after conjunction.
The non-transformed gas Ammonic washing tower 102 and 201 bottom of conversion gas Ammonic washing tower can be sent containing ammonia solution to sour water stripping (SWS) list Member recycling gas containing NH3.
The non-transformed aspiration tower 101 and the carbon dioxide enriched absorbing liquid with trace NH3 of 203 tower bottom of conversion gas absorption tower It send to prewashing flash column 606, flashes off H2 and CO contained in absorbing liquid by two sections, be pressurized by recycle gas compressor 608 After reenter system and recycled.
The rich carbon methanol fractions that conversion gas first takes off 23 bottom of charcoal section send to the second flash column and flash II section 320, flash off H2, CO and partial CO 2, to reduce 608 load of recycle gas compressor, the second flash column flash distillation II section 320 is flashed off effectively Pneumatic transmission to the second flash column flash distillation I section 310 is reabsorbed, to reduce carbon dioxide content.Non-transformed 12 bottom of desulfurization section The sulfur-rich methanol of 22 bottom of sulfur-rich methanol and desulfuration of shift gas section send to the second flash column and flash I sections, flash off H2, CO and the Two flash columns flash distillation II section 320 is flashed off after H2, CO that H2, CO merge and the first flash column 606 flashes off summarize and is sent to circulation Air compressor 608.
Sulfur-rich methanol is sent to the second flash column carbon dioxide product section 340 after second flash column flash distillation I section 310 has flashed, Carbon dioxide product gas is flashed off in this section of decompression, the sulfur-rich methanol after flashed carbon dioxide send to Analytic Tower and reabsorbs section 430. Second flash column flash II sections flashed after the rich carbon methanol of not sulfur-bearing be divided into two branches, sent all the way to the second flash column dioxy Change carbon products section 340, in addition send all the way to Analytic Tower carbon dioxide product section 460.
Second flash column carbon dioxide product section 340 flashes off carbon dioxide production with Analytic Tower carbon dioxide product section 460 Product gas summarize after through carbon dioxide general pipeline 9 send out battery limit (BL).The rich carbon methanol of sulfur-bearing is not dodged in Analytic Tower carbon dioxide product section 460 Steam carbon dioxide after methanol sequentially enter low pressure flash section 450 and master washes flash zone 440, flash off partial CO 2 send to Tail gas washing tower 605 is vented after washed.Half poor methanol after having flashed most of carbon dioxide is sent as absorbing liquid to transformation Aspiration tower 203.Sulfur-rich methanol, which flashes off, to be entered Analytic Tower after carbon dioxide and reabsorbs section 430, air lift nitrogen analytically tower gas It proposes I section 410 to be passed through, sulfur-rich methanol is in air lift I section 410, air lift II section 420 and reabsorbs the abundant air lift of section 430, and air lift tail gas is sent It is vented after being washed to tail gas washing tower 602.Sulfur-rich methanol after I sections of air lift, II sections of air lift and re-absorption section air lift is recovered cold It is further handled after amount.
From 405 bottom of Analytic Tower, sulfur-rich methanol enters flash evaporation section 530, and the gas released is sent into desorber air lift I Section 410, is enriched with most of sulphur in methanol.Sulfur-rich methanol after flash evaporation section 530 enters hydrogen sulfide stripping section 520, Sulfur-rich methanol is sufficiently regenerated by methanol steam air lift, one is generated methanol steam by Shuifu County's collection section reboiler 505, in addition One (is passed through in the middle part of hydrogen sulfide stripping section packing area) from 602 tower top methanol steam of methanol-water separating, methanol-water separation 602 methanol steam of tower is generated by methanol-water separating reboiler 601.The air lift methanol steam at 520 top of hydrogen sulfide stripping section is rich Containing sour gas, cooling by prewashing methanol heater 509, methanol condensed liquid is from sour gas in hot recycling tower return tank 508 It separates, methanol condensed liquid is back to hydrogen sulfide stripping section by Liquid level hot recycling tower reflux pump 507, not solidifying acidity Battery limit (BL) is discharged in gas.
It is poor after a small gangs of hot recycling of the self-heating regenerator hydrogen sulfide stripping section in 602 future of methanol-water separating 520 Methanol is sent into methanol-water separating 602 as reflux, by the means of rectifying in water through the second delivery pump of hot recycling tower 506 Separating methanol comes out.
The raw material of the tail gas washing tower 605 comes from 405 tail gas of desorber, by the water washing from methanol-water separating, To reduce methanol content therein before being discharged into atmosphere.A small amount of fresh demineralized water from battery limit (BL) enters tail gas as supplement water Scrubbing tower washing, the tail gas left contain Trace Methanol, are discharged into atmosphere via sufficiently high chimney.It is left by tower bottom Liquid level The methanol water mix-ture of tail gas washing tower 605 by sewage pump 604 enter sewage cooler 603, with come from methanol-water separating It is sent back to after the water counterflow heat exchange of 602 bottoms in methanol-water separating 602 to guarantee Methanol Recovery.

Claims (10)

1. a kind of rectisol system, including unchanged ventilation clean unit, conversion gas clean unit, F- T synthesis tracheae and first Alcohol syngas tube；Wherein,
The unchanged ventilation clean unit includes non-transformed gas Ammonic washing tower, the first heat exchange unit and non-transformed aspiration tower；Wherein, The non-transformed gas Ammonic washing tower is used to carry out countercurrent washing to unchanged ventilation using boiler water to remove the ammonia in unchanged ventilation； First heat exchange unit exchanges heat drop for making the unchanged ventilation from the non-transformed gas Ammonic washing tower in the first heat exchange unit Temperature；The non-transformed aspiration tower sets gradually unchanged ventilation prewashing section, non-transformed desulfurization section and unchanged ventilation from the bottom to top Decarbonization section is separated between each section by chimney tower tray, for using spray methanol solution successively to from first heat exchange The unchanged ventilation of unit carries out prewashing, desulfurization and carbonization treatment, and the non-transformed pneumatic transmission of obtained purification is entered the first heat exchange unit Carry out cold recovery；
The conversion gas clean unit includes conversion gas Ammonic washing tower, the second heat exchange unit and conversion gas absorption tower；Wherein, the change Ammonic washing tower of taking a breath is used to carry out countercurrent washing to conversion gas using boiler water to remove the ammonia in conversion gas；Second heat exchange Unit exchanges heat cooling for making the conversion gas from the conversion gas Ammonic washing tower in the first heat exchange unit；The transformation aspiration Tower sets gradually conversion gas prewashing section, the second decarburization of desulfuration of shift gas section, the first decarbonization section of conversion gas and conversion gas from the bottom to top Section, it is separated between each section by chimney tower tray, for utilizing spray methanol solution successively to from second heat exchange unit Conversion gas carry out prewashing, desulfurization and carbonization treatment, and obtained purification is sent into the second heat exchange unit and carries out cooling capacity Recycling；With
The F- T synthesis tracheae and methanol-fueled CLC tracheae are respectively used to the unchanged ventilation of receiving portion purification and Partial cleansing transformation Gas.
2. rectisol system according to claim 1, which is characterized in that the rectisol system further includes poor Methanol pipe and half poor methanol pipe；The unchanged ventilation clean unit further includes the first delivery pump and the first cooler；The transformation Gas clean unit further includes First Heat Exchanger, the second cooler and third cooler；Second decarbonization section of conversion gas by down toward On set gradually the first packing area, the second packing area and column plate area；Wherein,
The poor methanol pipe is for respectively to the top of the non-transformed gas decarbonization section and conversion gas the second decarbonization section column plate area Top conveys poor methanol as spray methanol solution；The half poor methanol pipe is used for the first filler of second decarbonization section of conversion gas The top in area conveys half poor methanol as spray methanol solution；
First delivery pump is used to the methanol solution of the non-transformed gas decarbonization section bottom being sent into first cooler；It is described First cooler is used to carry out the methanol solution from the first delivery pump cooling and is sent to the non-transformed desulfurization section respectively Top, it is described it is unchanged ventilation prewashing section the second packing area of top and the second decarbonization section of the conversion gas top as spray Methanol solution；
The First Heat Exchanger and the second cooler are used for successively to the methanol solution from second decarbonization section of conversion gas bottom It cools down；
The third cooler is for cooling down the part methanol solution from first decarbonization section of conversion gas bottom And it is sent to the top of the desulfuration of shift gas section and the top of the conversion gas prewashing section respectively as spray methanol solution.
3. rectisol system according to claim 2, which is characterized in that the unchanged ventilation clean unit further includes First methanol delivery pipe and the second methanol delivery pipe；Wherein, the first methanol delivery pipe is used for the non-transformed desulfurization The methanol solution of section bottom is sent out；The second methanol delivery pipe is used to send the methanol solution of the unchanged ventilation prewashing section bottom Out；
The conversion gas clean unit further includes third methanol delivery pipe, the 4th methanol delivery pipe and the 5th methanol delivery pipe；Its In, the third methanol delivery pipe is used to send out remaining methanol solution of first decarbonization section of conversion gas bottom；Described 4th Methanol delivery pipe is used to send out the methanol solution of desulfuration of shift gas section bottom；The 5th methanol delivery pipe is used for will be described The methanol solution of conversion gas prewashing section bottom is sent out.
4. rectisol system according to claim 3, which is characterized in that the rectisol system further includes first Alcohol regeneration unit, for the complete unchanged ventilation of purification and change from unchanged the ventilation clean unit and conversion gas clean unit The methanol of ventilation is regenerated, to obtain poor methanol and half poor methanol.
5. rectisol system according to claim 4, which is characterized in that the Mathanol regenerating unit includes the first sudden strain of a muscle Steam tower, the second flash column, Analytic Tower, hot recycling tower, third heat exchange unit, methanol-water separating, tail gas washing tower, wherein
First flash column is used to flash the methanol solution for coming the second methanol delivery pipe and the 5th methanol delivery pipe, To flash off the CO and H that absorb in methanol solution2；
Second flash column is used for from the first methanol delivery pipe, third methanol delivery pipe and the 4th methanol delivery pipe Methanol solution flashed, to isolate the carbon dioxide absorbed in methanol solution as carbon dioxide product gas；
The Analytic Tower is for handling the methanol solution from second flash column, to be further separated out in methanol solution The carbon dioxide of absorption obtains half poor methanol and is enriched with the rich hydrogen sulfide methanol solution of hydrogen sulfide as carbon dioxide product gas；
The hot recycling tower is used for remaining after flashing in rich hydrogen sulfide methanol solution and the first flash column from the Analytic Tower Methanol solution regenerated, with isolated hydrogen sulfide sour gas, poor methanol and water；
The third heat exchange unit is used to recycle the cooling capacity in the Mathanol regenerating unit with cooling at least partially from the heat The poor methanol of regenerator；
After water and tail gas washing tower washing tail gas that the methanol-water separating is used to isolate the hot recycling tower Water carries out rectification process, further to separate and recover methanol from water；
The tail gas washing tower is used for the water using the methanol-water separating tower bottom to the to be discharged of the Mathanol regenerating unit Tail gas is washed, the water after tail gas and washing tail gas to absorb the methanol carried secretly in tail gas, after being washed.
6. rectisol system according to claim 5, which is characterized in that
First flash column is disposed with II sections of I sections of the flash distillation and flash distillation of isolation, and first flash distillation from the bottom to top The first flash column heat exchanger is additionally provided with outside tower；Wherein, it is used for next second methanol for II sections of the flash distillation of first flash column The methanol solution of delivery pipe and the 5th methanol delivery pipe is flashed；The first flash column heat exchanger is for making from described first The methanol solution and the extraneous nitrogen being sent into of the II sections of bottoms of flash distillation of flash column exchange heat and heat up；I sections of first flash column with to next It is flashed from the methanol solution of the first flash column heat exchanger；
Second flash column sets gradually I sections of flash distillation, II sections of flash distillation, flash distillation III sections and carbon dioxide product section from the bottom to top, Wherein, second flash column flashes I sections, flashes and setting is isolated between II sections and its III sections of flash distillation, and second flash column dodges It steams III sections to be split between its carbon dioxide product section by chimney tower tray, and second flash column further includes the Two flash column appendixs, the second flash column perfusion tube, the second flash column refeed line, the first carbon dioxide product tracheae, second dodge Steam tower cooler device 208 and the second flash column heat exchanger；
Wherein, the second flash column cooler is for cooling down the methanol solution from the third methanol delivery pipe, institute It states the second flash column and flashes II sections for flashing to through the second flash column cooler methanol solution after cooling；
Second flash column flashes I sections and sets gradually packing area and column plate area from the bottom to top, the first methanol delivery pipe Methanol solution discharge port is located at the column plate area top that second flash column flashes I sections, and the second flash column appendix is used for will The flash steam that second flash column flashes II sections is sent to second flash column in the column plate area for flashing I sections, and described second dodges Tower heat exchanger is steamed to be used to that the methanol solution from the 4th methanol delivery pipe to be made to exchange heat to cool down and send the methanol solution after cooling to described Second flash column flashes between I sections of packing area and column plate area；
Second flash column flash III section for from the Analytic Tower after third heat exchange unit recycling cooling capacity Methanol solution flashed；The second flash column carbon dioxide product section sets gradually packing area and column plate area from the bottom to top；
The methanol solution that the second flash column perfusion tube is used to flash second flash column II sections of bottoms is sent respectively to described The column plate area top of second flash column carbon dioxide product section and the Analytic Tower,
The second flash column refeed line is used to send the methanol solution for flashing I sections of bottoms from second flash column to described the Above the packing area of two flash column carbon dioxide product sections；The first carbon dioxide product tracheae through described second for that will dodge The carbon dioxide product pneumatic transmission that tower carbon dioxide product section is handled is steamed to go out.
7. rectisol system according to claim 6, which is characterized in that
The Analytic Tower sets gradually I sections of stripping, II sections of stripping from the bottom to top, reabsorbs section, leads and wash flash zone, low pressure flash section With carbon dioxide product section, wherein the Analytic Tower strips I sections, strips II sections and its reabsorb between section through chimney tower tray It is split, the Analytic Tower reabsorbs section, master washes between flash zone, low pressure flash section and its carbon dioxide product section to be isolated and set It sets；And be additionally provided with outside the Analytic Tower the first Analytic Tower delivery pump, the second Analytic Tower delivery pump, third Analytic Tower delivery pump and 4th Analytic Tower delivery pump；
The Analytic Tower carbon dioxide product section is used to flash the methanol solution from the second flash column perfusion tube, with Obtain carbon dioxide flash steam；
The Analytic Tower low pressure flash section is for dodging the methanol solution from the Analytic Tower carbon dioxide product section bottom It steams；
The Analytic Tower master washes flash zone and is used to flash the methanol solution from the Analytic Tower low pressure flash section bottom, with Obtain half poor methanol；
The first Analytic Tower delivery pump is used to half poor methanol that the Analytic Tower master washes flash zone bottom being delivered to the change As spray methanol above first packing area of the second decarbonization section of adsorption tower of taking a breath；
The Analytic Tower reabsorbs section and sets gradually packing area and column plate area from the bottom to top, and is additionally provided with re-absorption section feeding Pipe, the re-absorption section feeding pipe is for the methanol solution from the second flash column carbon dioxide product section bottom to be delivered to It reabsorbs above section column plate area as spray methanol；
The second Analytic Tower delivery pump is used to the methanol solution for reabsorbing section bottom being sent to the third heat exchange unit and return Cooling capacity is received so that the charging methanol solution for flashing III sections as second flash column is flashed；
II sections of the stripping from the gas of I sections of the stripping using through chimney tower tray to from second flash column for dodging The methanol solution for steaming III sections of bottoms is stripped；
The third Analytic Tower delivery pump is used to make the methanol solution of II sections of bottoms of the stripping successively through First Heat Exchanger and second I sections of the stripping is returned after the heat exchange heating of flash column heat exchanger；
I section of the stripping is for using from the first flash column heat exchanger and from stripping nitrogen that I pars infrasegmentalis introduces and next From the hot recycling tower and from the tower overhead gas of I sections of middle part introducings is stripped to successively through First Heat Exchanger and the second flash column heat exchanger The methanol solution returned after heat exchange heating is stripped；
The 4th Analytic Tower delivery pump is used to send out the methanol solution of described I sections of bottoms of stripping；
The hot recycling tower sets gradually Shuifu County's collection section, hydrogen sulfide stripping section and flash evaporation section from the bottom to top, wherein described Shuifu County Collection section is separated with hydrogen sulfide stripping section by chimney tower tray, the hydrogen sulfide stripping section and the isolation setting of flash evaporation section；Institute It states hydrogen sulfide stripping section and sets gradually packing area and column plate area from the bottom to top；
Hot recycling tower First Heat Exchanger, prewashing methanol heater, hot recycling tower return tank, heat are additionally provided with outside the hot recycling tower again Raw tower reflux pump, the first delivery pump of hot recycling tower, the second delivery pump of hot recycling tower；
The flash evaporation section is used for the first through the heat exchange heating of hot recycling tower First Heat Exchanger from the 4th Analytic Tower delivery pump Alcohol liquid is flashed, and tower top pneumatic transmission to the methanol solution that stripping I sections of middle parts, bottoms obtain that top obtains is sent to the vulcanization Above the column plate area of hydrogen stripping section；
The hydrogen sulfide stripping section is used to strip top-down methanol solution using from methanol steam, first is stripped off Hydrogen sulfide in alcohol liquid, to obtain sulfide hydrogen stripped product at the top of hydrogen sulfide stripping section, bottom obtains poor methanol；
The prewashing methanol heater is used to make to flash the methanol solution of I sections of bottoms from first flash column and from the sulphur The stripped product for changing hydrogen stripping section, which exchanges heat, to heat up, and the methanol solution after heat exchange is sent to the upper of the hydrogen sulfide stripping section column plate area Portion；The hot recycling tower return tank is used to carry out gas-liquid point to the stripped product after prewashing methanol heater heat exchange cooling From, and the methanol solution isolated is back to the hydrogen sulfide stripping section column plate area top；
First delivery pump of hot recycling tower is for sending the partial regeneration poor methanol of hydrogen sulfide stripping section bottom to described Hot recycling tower First Heat Exchanger exchanges heat with the methanol solution from the 4th Analytic Tower delivery pump to cool down；
The second delivery pump of hot recycling tower is for sending the partial regeneration poor methanol of hydrogen sulfide stripping section bottom respectively to described Shuifu County collects section and methanol-water separating；
Described Shuifu County collection section is used for Shuifu County's collection section reboiler using the collection mating setting of section of described Shuifu County to from hot recycling tower the The part poor methanol of two delivery pumps is boiled again to obtain methanol steam at the top of Shuifu County's collection section, obtain water in bottom；The water Enrichment section delivery pump is used to the water of Shuifu County bottom Ji Duan being sent to methanol-water separating.
8. rectisol system according to claim 7, which is characterized in that
The methanol-water separating is used to carry out the water of water and tail gas washing tower tower bottom from described Shuifu County collection section delivery pump Rectifying is to obtain methanol steam in tower top, including tower top methanol tracheae, poor methanol return pipe and matches with the methanol-water separating Cover the methanol-water separating reboiler of setting, wherein the tower top methanol tracheae is for the tower top methanol steam to be delivered to The middle part of hydrogen sulfide stripping section packing area；The poor methanol return pipe is used to convey second delivery pump of hot recycling tower A part of poor methanol be sent into the top of the methanol-water separating as overhead reflux；
Sewage heat exchanger and sewage pump are additionally provided with outside the tail gas washing tower；The sewage heat exchanger is for making from the methanol The water heat exchange of water separation column tower bottom cools down and the water after cooling is delivered to the tail gas washing tower as washing water；
The tail gas washing tower is used for using the washing water to the re-absorption section from the Analytic Tower, the main flash zone and low washed The tail gas at the top of flash zone is pressed to carry out countercurrent washing and sent out the tail gas after washing by tower top；The sewage pump is used for will be described Sewage after the interior washing tail gas of tail gas washing tower is sent into sewage heat exchanger and carries out heat exchange heating so as to as the feeding methanol-water The aqueous solution of knockout tower.
9. rectisol system according to claim 8, which is characterized in that the Mathanol regenerating unit further includes circulation Air compressor, for from first flash column flashes I sections, the first flash column flashes I sections and the second flash column flashes I sections Top flash steam be pressurized and be recycled to from the non-transformed gas Ammonic washing tower wait enter first heat exchange unit In unchanged ventilation.
10. a kind of providing method of synthesis gas needed for methanol synthesis unit and F- T synthesis unit, which is characterized in that by coal gasification Separate two strands after resulting raw gas dedusting, wherein one as non-transformed pneumatic transmission enter rectisol system be purified it is unchanged Ventilation, another stock enter the rectisol system as variation pneumatic transmission after transformation adjusts C/Hratio and be purified transformation Gas；Wherein, it is rectisol system of any of claims 1-9 that the low-temp methanol, which washes unit,；
The unchanged ventilation of a part purification and a part purification variation gas are mixed, to obtain having with synthesis gas needed for F- T synthesis Synthesis gas of the gaseous mixture of essentially identical hydrogen-carbon ratio as F- T synthesis unit；
Another part is purified into unchanged ventilation and another part purification variation gas mixes, to obtain and synthesis gas needed for methanol-fueled CLC Synthesis gas of the gaseous mixture with essentially identical hydrogen-carbon ratio as methanol synthesis unit.
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