CN213708249U - Coke oven gas purification device - Google Patents
Coke oven gas purification device Download PDFInfo
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- CN213708249U CN213708249U CN202022740812.3U CN202022740812U CN213708249U CN 213708249 U CN213708249 U CN 213708249U CN 202022740812 U CN202022740812 U CN 202022740812U CN 213708249 U CN213708249 U CN 213708249U
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Abstract
The utility model relates to a coke oven gas purification device, it includes two at least purifying towers, heater, hydrogenation reaction tower, fine desulfurization tower, booster compressor (need set up according to follow-up process units), regenerative heater that are used as micrite absorption and regeneration alternately. The microcrystalline material used in the microcrystalline purification tower can remove inorganic sulfur, organic sulfur, benzene, naphthalene, tar, ammonia and the like in the coke oven gas at normal temperature, and the microcrystalline purification tower has the advantages of small equipment quantity, small occupied area, high economy and renewable use; and the purified gas is used as a regeneration gas source, the regenerated gas is returned to the coking device to recover tar and naphthalene, and the hydrogen sulfide is further removed for recycling, so that a new regeneration gas source is not introduced, and the waste and pollution of the regenerated gas are prevented.
Description
Technical Field
The utility model relates to a coke oven gas purification device.
Background
The coke oven gas is a byproduct obtained in the coking industry, mainly comprises hydrogen, methane, carbon monoxide and carbon dioxide, and is a very important fuel and chemical raw material; at present, the yield of coke oven gas generated by coking enterprises in China reaches 2000 hundred million, so that how to utilize the coke oven gas efficiently and cleanly is an important link of an energy industry structure.
The coke oven gas contains impurities such as inorganic sulfur, organic sulfur, benzene, naphthalene, tar, ammonia and the like, and can seriously pollute the environment when being directly combusted as fuel; the catalyst used for synthesizing methanol and natural gas and producing hydrogen by using the method can cause coking, blockage and poisoning of the catalyst in the subsequent process, and cause the activity of the catalyst to be reduced and even inactivated, so that the purification of the coke oven gas is an important subject for clean utilization of the coke oven gas.
The purification of coal gas in the traditional process project of synthesizing methanol, natural gas and the like by coke oven gas is divided into three steps: (1) the activated carbon adsorbent absorbs oil, naphthalene and a small amount of inorganic sulfur; (2) converting organic sulfur to inorganic sulfur using cobalt molybdenum and nickel molybdenum catalysts; (3) removing inorganic sulfur by using a zinc oxide desulfurizer; the process has the advantages of large quantity of equipment, large occupied area and short service life of the catalyst.
The novel microcrystalline material is an artificially synthesized aluminosilicate crystal, the pore size of the microcrystalline material is uniformly distributed, and different substance molecules are adsorbed and repelled by depending on the size of an internal gap, so that the adsorption effect is achieved.
The microcrystal material has high adsorption precision, can remove inorganic sulfur, organic sulfur, benzene, naphthalene, tar and ammonia simultaneously, is high-temperature resistant, can be regenerated repeatedly, and has the service life of more than 5 years.
The coke oven gas has strict requirements on sulfur content in the process of synthesizing methanol and liquefied natural gas, the microcrystalline material can be used for simultaneously removing inorganic sulfur, organic sulfur, benzene, naphthalene, tar, ammonia and the like in the coke oven gas at normal temperature, the number of equipment is small, the occupied area is small, the pollution is less, and the economy is high.
The conventional adsorbent regeneration device adopts nitrogen or steam as a regeneration gas source, regenerated waste gas and waste liquid are directly discharged into a sewage disposal pool, and if the steam is used as the regeneration gas, the temperature is higher, the regenerated waste gas and the regenerated waste liquid can be discharged into the sewage disposal poolGenerating smoke; nitrogen as regeneration gas can not be sent to torch, and the site is discharged because of H2S, the smell is big on site, and the air is polluted.
SUMMERY OF THE UTILITY MODEL
Problem to above-mentioned prior art exists, the utility model provides a coke oven gas purifier uses a small amount of gas as the regeneration gas behind the micrite absorption, carries out micrite adsorbent regeneration after heating through the regeneration gas heater, and the gas returns coker recovery tar, naphthalene after the regeneration to further desorption hydrogen sulfide, cyclic use avoids introducing new regeneration air supply promptly, prevents the gas waste and the air pollution after the regeneration again.
The coke oven gas purification device of the utility model comprises at least two purification towers (for example, 2-10, preferably 2-5 such as 2, 3, 4 and the like) which are alternately used for microcrystal adsorption and regeneration, a heater, a hydrogenation reaction tower, a fine desulfurization tower and a regenerative heater;
wherein the coke oven gas pipeline is divided into a plurality of branches which are respectively connected to the coke oven gas inlets of at least two purifying towers, the plurality of branches of the coke oven gas pipeline are respectively provided with a valve, a plurality of purifying tower top outlet main pipelines (formed by converging tower top outlet pipelines of a plurality of purifying towers) are divided into three branches, each branch is provided with a valve for controlling the purified coke oven gas of the purifying towers to go, the first branch is taken as a purified gas fuel gas pipeline, the second branch is connected with the inlet of the hydrogenation reaction tower through a heater, the third branch is taken as a regenerated gas pipeline, is divided into a plurality of branches after passing through a regenerated gas heater and is respectively connected to the regenerated gas inlets of the purifying towers, or the third branch is taken as a regenerated gas pipeline and is divided into a plurality of branches, each branch is respectively connected to the purifying towers through the regenerated gas heater, the plurality of branches of the regenerated gas pipeline are respectively provided with valves, the outlet of the hydrogenation reaction tower, the purified gas at the outlet of the fine desulfurization tower is subjected to methanol synthesis or methanation process device, and the regenerated gas outlets of the plurality of purification towers return to the coking device through a regenerated gas waste gas pipeline for recovering tar and naphthalene, further removing hydrogen sulfide and recycling.
Furthermore, a second branch of the main pipeline of the top outlet of the purification tower is connected with the inlet of the hydrogenation reaction tower through a supercharger and a heater in sequence, and the supercharger is arranged according to the requirements of subsequent process devices.
Further, the plurality of purification towers use aluminosilicate crystalline microcrystalline material as an adsorbent.
The utility model further provides a coke oven gas purification process using the device, include:
the coke oven gas enters a purifying tower to remove benzene, naphthalene, tar, ammonia, inorganic sulfur and organic sulfur, and the amount of the tar and the naphthalene is lower than 1mg/m after the tar and the naphthalene are adsorbed3The content of impurities such as ammonia, hydrogen sulfide and the like is less than 20mg/m3The product meets the quality requirement of 'artificial gas' GB13612, and can be directly used as fuel.
If the coke oven gas is used as an industrial raw material for processes needing deep purification, such as methanol synthesis or methanation, and the like, the total sulfur content needs to be further reduced, purified gas passing through a microcrystal purification tower is heated to 300-400 ℃ by a heater, enters a hydrogenation reaction tower, organic sulfur is converted into inorganic sulfur, then the total sulfur is controlled to be below 0.1ppm by a fine desulfurization tower, and enters a subsequent process device. If the pressure required by the subsequent process unit is high, a booster can be arranged before the heater, so that the sizes of the hydrogenation reaction tower and the fine desulfurization tower and the filling amount of the catalyst can be reduced.
After the microcrystal is adsorbed in the purification tower, the microcrystal is regenerated by using 200-280 ℃ regeneration gas (purification gas), at the moment, one or more purification towers are in the regeneration process through valve switching, the other one or more purification towers are in the adsorption process, and the regenerated gas pipeline returns to a coking device to recover tar and naphthalene, further remove hydrogen sulfide and is recycled. When the other one or more purification towers need to be regenerated, one or more purification towers are in the adsorption process through valve switching, and the process is repeated in a circulating way.
The advantages of the utility model
The microcrystalline adsorption tower can simultaneously remove a large amount of inorganic sulfur, organic sulfur, benzene, naphthalene, tar, ammonia and the like in the coke oven gas at normal temperature by using microcrystalline materials, and has the advantages of small equipment quantity, small occupied area, high economy and renewable use; and the purified gas is used as a regeneration gas source, the regenerated gas is returned to the coking device to recover tar and naphthalene, and the hydrogen sulfide is further removed for recycling, so that a new regeneration gas source is not introduced, and the waste and pollution of the regenerated gas are prevented.
Drawings
FIG. 1 is a schematic view of a coke oven gas purification device of the present invention.
1-first purifying tower 2-second purifying tower 3-heater 4-hydrogenation reaction tower 5-fine desulfurizing tower 6-supercharger
7-regenerated gas heater 8-coke oven gas pipeline 9-regenerated gas pipeline 10-purified gas raw material gas pipeline 11-regenerated gas waste gas pipeline
12-purge gas fuel gas line.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in FIG. 1, the coke oven gas purification device comprises a first purification tower 1 and a second purification tower 2 (if the gas quantity is large, a third purification tower and a fourth purification tower … … can be added correspondingly) which are alternately used for adsorbing and regenerating microcrystals, a heater 3, a hydrogenation reaction tower 4, a fine desulfurization tower 5 and a regenerative heater 7.
Wherein the coke oven gas pipeline is divided into two branches which are respectively connected with the coke oven gas inlets of a first purifying tower 1 and a second purifying tower 2 (for example, 3, 4, 5 and the like if the gas amount can be increased greatly), the two branches of the coke oven gas pipeline are respectively provided with a valve, a main pipeline of the top outlets of the two purifying towers (formed by converging the outlet pipelines at the tops of the two purifying towers) is divided into three branches, each branch is provided with a valve for controlling the purified coke oven gas of the purifying towers to go, the first branch is used as a purified gas pipeline 12, the second branch is connected with the inlet of a hydrogenation reaction tower 4 through a heater 3, the third branch is used as a regenerated gas pipeline 9 and is divided into two branches after passing through a regenerated gas heater 7, the third branch is respectively connected with the regenerated gas inlets of the two purifying towers 1 and 2, or the third branch is used as a regenerated gas pipeline 9, and the two branches are respectively connected with the two purifying towers 1, 2, a plurality of branches of the regenerated gas pipeline are respectively provided with a valve, the outlet of the hydrogenation reaction tower 4 is connected with the inlet of the fine desulfurization tower 5, the purified gas at the outlet of the fine desulfurization tower 5 is subjected to methanol synthesis or methanation process device, and the regenerated gas outlets of the two purification towers 1 and 2 return to the coking device through a regenerated gas and waste gas pipeline 11, so that tar and naphthalene can be recovered, and hydrogen sulfide can be further removed for recycling.
Preferably, the second branch of the overhead outlet main line is connected with the inlet of the hydrogenation reaction tower through a booster 6 and a heater 3 in sequence, and the booster is arranged according to the requirements of subsequent process devices.
The first purification tower 1 and the second purification tower 2 use aluminosilicate crystal microcrystalline material as an adsorbent.
The coke oven gas purification process using the device comprises the following steps:
the coke oven gas enters a purifying tower 1 to remove benzene, naphthalene, tar, ammonia, inorganic sulfur and organic sulfur, and the amount of the tar and the naphthalene is lower than 1mg/m after the tar and the naphthalene are adsorbed3The content of impurities such as ammonia, hydrogen sulfide and the like is less than 20mg/m3The product meets the quality requirement of 'artificial gas' GB13612, and can be directly used as fuel.
If the coke oven gas is used as an industrial raw material for processes needing deep purification, such as methanol synthesis or methanation, and the like, the total sulfur content needs to be further reduced, purified gas passing through a microcrystal purification tower is heated to 300-400 ℃ by a heater, enters a hydrogenation reaction tower, organic sulfur is converted into inorganic sulfur, then the total sulfur is controlled to be below 0.1ppm by a fine desulfurization tower, and enters a subsequent process device. If the pressure required by the subsequent process unit is high, a booster can be arranged before the heater, so that the sizes of the hydrogenation reaction tower and the fine desulfurization tower and the filling amount of the catalyst can be reduced.
After the microcrystal is adsorbed in the first purifying tower 1, regenerating the microcrystal by using 200-DEG C280-DEG C regeneration gas (purification gas), wherein the first purifying tower 1 is in the regeneration process, the second purifying tower 2 is in the adsorption process through valve switching, and the regenerated gas pipeline returns to the coking device to recover tar and naphthalene, further remove hydrogen sulfide and recycle. When the second purifying tower 2 needs to be regenerated, the first purifying tower 1 is in the adsorption process through valve switching, and the process is repeated in a circulating way.
Claims (4)
1. A coke oven gas purification device is characterized by comprising at least two purification towers alternately used for microcrystal adsorption and regeneration, a heater, a hydrogenation reaction tower, a fine desulfurization tower and a regeneration heater;
wherein the coke oven gas pipeline is divided into a plurality of branches which are respectively connected to the coke oven gas inlets of at least two purifying towers, the plurality of branches of the coke oven gas pipeline are respectively provided with a valve, the main pipeline of the ejection openings of the plurality of purifying towers is divided into three branches, each branch is provided with a valve for controlling the direction of purified coke oven gas of the purifying towers, the first branch is taken as a purified gas fuel gas pipeline, the second branch is connected with the inlet of the hydrogenation reaction tower through a heater, the third branch is taken as a regenerated gas pipeline which is divided into a plurality of branches after passing through a regenerated gas heater and is respectively connected to the regenerated gas inlets of the plurality of purifying towers, or the third branch is taken as a regenerated gas pipeline which is divided into a plurality of branches, each branch is respectively connected to the plurality of purifying towers through a regenerated gas heater, the plurality of branches of the regenerated gas pipeline are respectively provided with a valve, the outlet of the hydrogenation reaction tower is connected with the inlet of a fine desulfurizing, the regenerated gas outlets of the purification towers return to the coking device through a regenerated gas waste gas pipeline for recovering tar and naphthalene, and further removing hydrogen sulfide for recycling.
2. The coke oven gas purification device of claim 1, wherein the second branch of the purification tower overhead outlet main line is connected to the inlet of the hydrogenation reaction tower through a supercharger and a heater in sequence.
3. Coke oven gas cleaning apparatus according to claim 1 or 2, characterized in that a plurality of cleaning towers use aluminosilicate crystalline microcrystalline material as adsorbent.
4. The coke oven gas purification device of claim 1 or 2, wherein the number of purification towers is 2-10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022740812.3U CN213708249U (en) | 2020-11-24 | 2020-11-24 | Coke oven gas purification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022740812.3U CN213708249U (en) | 2020-11-24 | 2020-11-24 | Coke oven gas purification device |
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| Publication Number | Publication Date |
|---|---|
| CN213708249U true CN213708249U (en) | 2021-07-16 |
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| CN202022740812.3U Active CN213708249U (en) | 2020-11-24 | 2020-11-24 | Coke oven gas purification device |
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| CN (1) | CN213708249U (en) |
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- 2020-11-24 CN CN202022740812.3U patent/CN213708249U/en active Active
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