CN209940921U - Device for treating low-temperature methanol-washed hydrocarbon-containing exhaust gas - Google Patents
Device for treating low-temperature methanol-washed hydrocarbon-containing exhaust gas Download PDFInfo
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- CN209940921U CN209940921U CN201921192468.XU CN201921192468U CN209940921U CN 209940921 U CN209940921 U CN 209940921U CN 201921192468 U CN201921192468 U CN 201921192468U CN 209940921 U CN209940921 U CN 209940921U
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Abstract
The utility model discloses a handle device that low temperature methyl alcohol washed hydrocarbon-containing exhaust relates to coal chemical industry technical field, relates to low temperature methyl alcohol and washes. The system comprises a coke oven gas absorption tower, a shift gas absorption tower, a flash tower, a carbon dioxide product tower, a hydrogen sulfide concentration tower, a nitrogen stripping tower, a thermal regeneration tower, an acid gas separator, a tail gas washing tower and a buffer tank; the upper part of the flash tower is a coke oven gas treatment section, and the lower part of the flash tower is a conversion gas treatment section; the lower part of the coke-oven gas absorption tower is connected with the upper part of the flash tower, and the coke-oven gas treatment section is connected with the nitrogen stripping tower; the lower part of the shift gas absorption tower is connected with the lower part of the flash tower, and the shift gas treatment section is sequentially connected with the carbon dioxide product tower, the hydrogen sulfide concentration tower and the nitrogen stripping tower; the nitrogen stripping tower is connected with the thermal regeneration tower, and the thermal regeneration tower is respectively connected with the acid gas separator and the buffer tank. The utility model can enrich and recover the hydrocarbon-containing flash evaporation gas in the coke oven gas flow, realize the recycling of waste gas and reduce the equipment investment and the operation cost.
Description
Technical Field
The utility model relates to a coal chemical industry technical field relates to low temperature methyl alcohol and washes, in particular to handle device that low temperature methyl alcohol washed hydrocarbon-containing exhaust.
Background
The low-temperature methanol washing unit processes two feed gases, one is crude gas generated by coal gasification and converted gas obtained after CO conversion, and the other is coke oven gas. The low-temperature methanol washing process of the crude gas generated by coal gasification comprises the steps of firstly spraying a small strand of methanol into the crude gas shift conversion gas to reduce the dew point of the shift conversion gas, then entering a shift gas cooler to exchange heat with a plurality of strands of material flows, entering a shift gas absorption tower to sequentially pass through a desulfurization section and a decarburization section, and removing sulfides and CO by low-temperature lean methanol in the tower2The raw material is discharged from the top of the shift gas absorption tower, and is sent to a methanol synthesis unit after heat exchange; wherein the decarbonization section of the absorption tower absorbs CO2Most of the methanol rich solution at the temperature of-22 ℃ enters a medium-pressure flash tower, and a small part of the methanol rich solution enters a desulfurization section of an absorption tower to absorb H2S and then enters a medium-pressure flash tower for respectively carrying out reduced-pressure flash evaporation, and most effective gases (CO and H) are generated during flash evaporation of the two solutions2) Desorbed, the two flash gas towers are converged, and heat exchange is carried out and sent to a flash gas compressor to return to the system for recycling; before entering the low-temperature methanol washing device, the coke oven gas exchanges heat with purified coke oven gas and then enters the coke oven gas absorption deviceWashing the tower, spraying a large amount of lean methanol from the upper part, absorbing acid gas components and other sulfides in the coke oven gas, introducing rich methanol from the bottom part into a medium-pressure flash tower, and recovering CO and H dissolved in the methanol by flash evaporation2Returning to compression for recycling, feeding the flash-evaporated rich methanol into a hydrogen sulfide concentration tower, mixing the flash-evaporated rich methanol with the rich methanol from the upper section of the hydrogen sulfide concentration tower after absorbing the acid gas in the water gas, and washing the gas stripping gas from the top of the nitrogen gas stripping tower and the pre-washing flash steam from the top of the extractor. However, CO due to the water gas and coke oven gas regeneration scheme2The exhaust gas after the exhaust gas is sent to the tail gas washing tower for washing has no feasible treatment technology at present, so that the hydrocarbon substances in the exhaust gas meet the requirements of the latest environment-friendly emission standard due to the high content of the hydrocarbon substances.
Therefore, a method and a device capable of effectively recycling hydrocarbon substances in the exhaust gas are sought to solve the problem that the low-temperature methanol-washed hydrocarbon-containing exhaust gas does not reach the standard, and the technical problem to be solved in the field is urgently needed.
Disclosure of Invention
The utility model aims at providing a handle device that low temperature methyl alcohol washed hydrocarbon-containing exhaust.
The utility model discloses a realize through following technical scheme:
a device for treating low-temperature methanol-washing hydrocarbon-containing exhaust gas comprises a coke-oven gas absorption tower, a shift gas absorption tower, a flash tower, a carbon dioxide product tower, a hydrogen sulfide concentration tower, a nitrogen stripping tower, a heat regeneration tower, an acid gas separator, a tail gas water washing tower and a buffer tank; the flash tower is divided into four sections from top to bottom, the upper two sections are coke oven gas treatment sections, and the lower two sections are conversion gas treatment sections; the lower liquid discharge pipe of the coke-oven gas absorption tower is connected with the coke-oven gas treatment section at the upper part of the flash tower, and the coke-oven gas treatment section is connected with the nitrogen stripping tower; the liquid discharge pipe at the lower part of the shift gas absorption tower is connected with the shift gas treatment section at the lower part of the flash tower, and the shift gas treatment section is sequentially connected with the carbon dioxide product tower, the hydrogen sulfide concentration tower and the nitrogen stripping tower; the nitrogen stripping tower is connected with a thermal regeneration tower, and the thermal regeneration tower is respectively connected with an acid gas separator and a buffer tank; and exhaust ports of the carbon dioxide product tower and the hydrogen sulfide concentration tower are respectively connected with the tail gas washing tower.
Furthermore, a liquid discharge pipe at the lower part of the coke-oven gas absorption tower is connected with the first section of the flash tower, and the first section at the top of the flash tower is connected with the second section of the flash tower through a pipeline.
The lower part of the shifted gas absorption tower is a desulfurization section, the upper part of the shifted gas absorption tower is a decarburization section, a liquid discharge pipe of the desulfurization section is connected with the fourth section at the bottom of the flash tower, and a liquid discharge pipe of the decarburization section is connected with the third section of the flash tower.
And a filter is arranged at the bottom of the coke-oven gas absorption tower.
The utility model separately treats coke oven gas and water gas, namely, a line is designed for low-temperature methanol washing absorption of coke oven gas, methanol-rich low-pressure flash evaporation after medium-pressure flash evaporation and nitrogen stripping gas recovery, a line is designed for low-temperature methanol washing absorption of water gas, methanol solution after flash evaporation sequentially enters a carbon dioxide absorption tower and a hydrogen sulfide concentration tower, and stripping recovery is designed; during the specific operation, before the coke oven gas enters the methanol washing device, the coke oven gas is subjected to heat exchange with purified coke oven gas purified gas and cooled to-27 to-23 ℃, in order to prevent the coke oven gas from being frozen when being cooled below a dew point, a small strand of methanol is sprayed into the coke oven gas before the coke oven gas enters the coke oven gas cooler, the dew point of the coke oven gas is reduced, the coke oven gas enters the lower part of a 1 st tower plate of a coke oven gas absorption tower and is washed, the coke oven gas absorption tower is provided with two sections, the lower section is a pre-washing section, the upper section is a main washing section, the pre-washing section is used for washing the coke oven gas firstly, a pre-washing methanol solution at about-24 ℃ from the bottom is filtered and then sent to an extractor, flash evaporation gas and naphtha are recovered, a large amount of methanol at about-52 ℃ is sprayed above the tower plate at the upper part of the main2And other sulfides to make the total sulfur of the purified gas of the coke oven gas less than 0.1PPm and CO2The temperature is less than or equal to 20PPm and 25 ℃, and the air inlet requirement of the LNG cryogenic separation unit is met; the rich methanol from the lower part of the tower plate at the lower part of the main washing section of the coke oven gas absorption tower enters the upper part of the filler at the upper part of the first section at the top of the medium-pressure flash tower for decompression flash evaporation, the absorbed effective gas is desorbed, and the flash evaporation gas which is sent out from the top of the medium-pressure flash tower and has the temperature of about-33 ℃ is reheated toCompressing and recycling at 30 ℃; feeding the methanol rich after medium-pressure flash evaporation at the temperature of about-33 ℃ sent from the bottom of the first section into a medium-pressure flash tower above a filler at the upper part of the second section, then carrying out low-pressure flash evaporation, feeding the hydrocarbon-containing methanol sent from the bottom of the second section into a nitrogen stripping tower for stripping after pressure heat exchange by a hydrocarbon-containing methanol pump, feeding the nitrogen stripping gas from the top of the nitrogen stripping tower into the bottom of the second section of the medium-pressure flash tower for further stripping the methanol rich from the bottom of the first section, further washing the nitrogen stripping gas by the methanol rich, carrying out flash evaporation at the second section, sending the flash gas out from the top of the second section, mixing the flash gas with the pre-washed flash gas from the top of an extractor, recycling the flash gas as hydrocarbon-containing exhaust gas, feeding the methanol at the bottom of the first section into a water gas stripping; thereby washing the coke oven gas with the methanol at low temperature to generate CO2The hydrocarbon substances in the exhaust gas can be recovered and used as fuel gas to ensure that CO in the low-temperature methanol washing device2The exhaust gas contains almost no hydrocarbons.
The utility model has simple structure and can ensure CO2The discharged gas is discharged up to the standard, the hydrocarbon-containing flash evaporation gas in the coke oven gas flow is enriched and recovered, the recycling of waste gas is realized, and the equipment investment cost and the operation cost are greatly reduced.
Drawings
Fig. 1 is a schematic structural view of the present invention;
in the figure: the system comprises a coke oven gas absorption tower 1, a flash tower 2, a carbon dioxide product tower 3, a hydrogen sulfide concentration tower 4, a nitrogen stripping tower 5, a thermal regeneration tower 6, an acid gas separator 7, a tail gas water washing tower 8, a buffer tank 9, a filter 10 and a shift gas absorption tower 11.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
The device for treating the low-temperature methanol-washed hydrocarbon-containing exhaust gas shown in fig. 1 comprises a coke oven gas absorption tower 1, a shift gas absorption tower 11, a flash tower 2, a carbon dioxide product tower 3, a hydrogen sulfide concentration tower 4, a nitrogen stripping tower 5, a thermal regeneration tower 6, an acid gas separator 7, a tail gas water washing tower 8 and a buffer tank 9; the flash tower 2 is divided into four sections from top to bottom, the upper two sections are coke oven gas treatment sections, and the lower two sections are conversion gas treatment sections; the lower liquid discharge pipe of the coke-oven gas absorption tower 1 is connected with the coke-oven gas treatment section at the upper part of the flash tower 2, and the coke-oven gas treatment section is connected with the nitrogen stripping tower 5; a liquid discharge pipe at the lower part of the shift gas absorption tower 44 is connected with a shift gas treatment section at the lower part of the flash tower 2, and the shift gas treatment section is sequentially connected with a carbon dioxide product tower 3, a hydrogen sulfide concentration tower 4 and a nitrogen stripping tower 5; the nitrogen stripping tower 5 is connected with a thermal regeneration tower 6, and the thermal regeneration tower 6 is respectively connected with an acid gas separator 7 and a buffer tank 9; and exhaust ports of the carbon dioxide product tower 3 and the hydrogen sulfide concentration tower 4 are respectively connected with a tail gas washing tower 8.
A liquid discharge pipe at the lower part of the coke-oven gas absorption tower 1 is connected with a first section of the flash tower 2, and the first section at the top of the flash tower 2 is connected with a second section of the flash tower 2 through a pipeline; the lower part of the shift gas absorption tower 11 is a desulfurization section, the upper part is a decarburization section, a liquid discharge pipe of the desulfurization section is connected with the fourth section at the bottom of the flash tower 2, and a liquid discharge pipe of the decarburization section is connected with the third section of the flash tower; the bottom of the coke oven gas absorption tower 1 is provided with a filter 10.
The operation steps are as follows: 1) injecting a small strand of methanol into coke oven gas, reducing the dew point of the coke oven gas, then entering the lower part of a 1 st tower plate at the bottom of a prewashing section at the lower part of a coke oven gas absorption tower for washing, firstly washing the coke oven gas in the prewashing section, filtering a prewashing methanol solution at about-24 ℃ from the bottom by a filter, then sending the prewashing methanol solution to an extractor, recovering flash steam and naphtha, injecting a large amount of lean methanol at about-52 ℃ above the tower plate at the upper part of an upper main washing section, and simultaneously absorbing H in the coke oven gas2S、CO2And other sulfides to make the total sulfur of the purified gas of the coke oven gas less than 0.1PPm and CO2The temperature is less than or equal to 20PPm and 25 ℃, the air inlet requirement of an LNG cryogenic separation unit is met, rich methanol from the lower part of a tower plate at the lower part of a main washing section of a coke oven gas absorption tower enters the upper part of a filler at the upper part of a first section at the top of a medium-pressure flash tower to be subjected to reduced pressure flash evaporation, absorbed effective gas is desorbed, and flash evaporation gas at about-33 ℃ sent from the top of the medium-pressure flash tower is reheated to 30 ℃ and sent to be compressed for recycling; 2) the shift gas is injected with methanol and is input after heat exchangeRemoving sulfides and carbon dioxide from the bottom of the shifted gas absorption tower through low-temperature methanol at the temperature of between 50 ℃ below zero and 55 ℃ below zero, and inputting the methanol rich solution into a third section and a fourth section of a flash tower; 3) the methanol-rich liquid at minus 30 ℃ to minus 36 ℃ sent out from the bottom of the first section of the flash tower enters a second section, the hydrocarbon-containing methanol sent out from the bottom of the second section enters a nitrogen stripping tower for stripping, the gas coming out from the top of the nitrogen stripping tower is input into the bottom of the second section of the medium-pressure flash tower for further stripping the methanol-rich liquid from the bottom of the first section, and the methanol-rich liquid is washed to form circulation; 4) after the methanol rich solution in the shift gas absorption tower is subjected to flash evaporation in the third section and the fourth section of the flash evaporation tower, the methanol solution is sequentially treated in a carbon dioxide product tower and a hydrogen sulfide concentration tower, the gas enters a tail gas washing tower for treatment, and the liquid enters a nitrogen stripping tower; 5) after the methanol liquid is treated by a nitrogen stripping tower, the methanol liquid is sequentially treated by a thermal regeneration tower, the gas is treated by an acid gas separator, and the liquid is treated by a filter.
Claims (4)
1. The device for treating the hydrocarbon-containing exhaust gas washed by the low-temperature methanol is characterized by comprising a coke oven gas absorption tower, a shift gas absorption tower, a flash tower, a carbon dioxide product tower, a hydrogen sulfide concentration tower, a nitrogen stripping tower, a heat regeneration tower, an acid gas separator, a tail gas water washing tower and a buffer tank; the flash tower is divided into four sections from top to bottom, the upper two sections are coke oven gas treatment sections, and the lower two sections are conversion gas treatment sections; the lower liquid discharge pipe of the coke-oven gas absorption tower is connected with the coke-oven gas treatment section at the upper part of the flash tower, and the coke-oven gas treatment section is connected with the nitrogen stripping tower; the liquid discharge pipe at the lower part of the shift gas absorption tower is connected with the shift gas treatment section at the lower part of the flash tower, and the shift gas treatment section is sequentially connected with the carbon dioxide product tower, the hydrogen sulfide concentration tower and the nitrogen stripping tower; the nitrogen stripping tower is connected with a thermal regeneration tower, and the thermal regeneration tower is respectively connected with an acid gas separator and a buffer tank; and exhaust ports of the carbon dioxide product tower and the hydrogen sulfide concentration tower are respectively connected with the tail gas washing tower.
2. The apparatus for treating low-temperature methanol-washed hydrocarbon-containing exhaust gas as claimed in claim 1, wherein the liquid discharge pipe at the lower part of the coke oven gas absorption tower is connected with the first section of the flash tower, and the first section at the top of the flash tower is connected with the second section of the flash tower through a pipeline.
3. The apparatus for treating low-temperature methanol-washed hydrocarbon-containing vent gas as claimed in claim 1 or 2, wherein the shift gas absorption tower is provided with a desulfurization section at the lower part and a decarburization section at the upper part, the liquid discharge pipe of the desulfurization section is connected with the fourth section at the bottom of the flash tower, and the liquid discharge pipe of the decarburization section is connected with the third section of the flash tower.
4. The apparatus for treating low-temperature methanol-washed hydrocarbon-containing exhaust gas as claimed in claim 1 or 2, wherein the bottom of the coke oven gas absorption tower is provided with a filter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921192468.XU CN209940921U (en) | 2019-07-26 | 2019-07-26 | Device for treating low-temperature methanol-washed hydrocarbon-containing exhaust gas |
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| CN201921192468.XU CN209940921U (en) | 2019-07-26 | 2019-07-26 | Device for treating low-temperature methanol-washed hydrocarbon-containing exhaust gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110295067A (en) * | 2019-07-26 | 2019-10-01 | 山西焦煤集团飞虹化工股份有限公司 | A kind of processing low-temp methanol washes the device and method of discharge gas containing hydrocarbon |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110295067A (en) * | 2019-07-26 | 2019-10-01 | 山西焦煤集团飞虹化工股份有限公司 | A kind of processing low-temp methanol washes the device and method of discharge gas containing hydrocarbon |
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