CN209974698U - Coal gas desulfurization double-circulation system - Google Patents
Coal gas desulfurization double-circulation system Download PDFInfo
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- CN209974698U CN209974698U CN201920469454.1U CN201920469454U CN209974698U CN 209974698 U CN209974698 U CN 209974698U CN 201920469454 U CN201920469454 U CN 201920469454U CN 209974698 U CN209974698 U CN 209974698U
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Abstract
The utility model provides a two circulation system of coal gas desulfurization, including the desulfurizing tower, the desulfurizing tower sets gradually downwards from the top, coal gas export, defogging board, upper portion spray thrower, second packing layer, middle part spray thrower, first packing layer, coal gas entry and first rich liquid groove, and below the desulfurizing tower middle part spray thrower including the middle part spray thrower be the first order circulation, be the second order circulation on it. The pH values of the desulfurization solutions in the two circulating stages are different, wherein the pH value of the desulfurization solution in the first stage is lower, and the pH value of the desulfurization solution in the second stage is higher. In addition, a communicating pipeline is arranged between the second-stage liquid enrichment tank and the bottom liquid enrichment tank, a cut-off valve is arranged in the pipeline, when certain waste water needs to be discharged in the second-stage circulation, the second-stage desulfurization circulating liquid is discharged into the first-stage circulating liquid through the communicating pipeline, the characteristic of high pH value is fully utilized, and the hydrogen sulfide is absorbed by the second-stage desulfurization circulating liquid again. The utility model discloses the equipment integrated level is high, has improved desulfurization efficiency, has reduced the waste liquid and has discharged.
Description
Technical Field
The utility model relates to a coal gas desulfurization technical field particularly, relates to a coal gas desulfurization double circulation system.
Background
The wet desulphurization process using sodium carbonate as an alkali source is commonly adopted in the pulverized coal gasification industry. The wet desulphurization process represented by the PDS desulphurization process has the advantages of high desulphurization efficiency, easy product separation and the like. The mass concentration of hydrogen sulfide in coal gas of the pulverized coal gasification furnace is about 1g/m3, and the content of hydrogen sulfide in the coal gas after desulfurization by adopting a single-tower sodium method can be controlled below 50mg/m 3. However, with the increasing stricter environmental requirements, the requirements for the content of hydrogen sulfide in coal gas of a pulverized coal gasification furnace are continuously increased, and the emission standard of 20mg/m3 needs to be met. The traditional single-tower desulfurization has difficulty reaching the emission requirement.
At present, various modifications are made to desulfurization equipment, and Chinese patent CN202936390 discloses coke oven gas desulfurization equipment, which mainly comprises a gas indirect cooler, a desulfurization tower and a regeneration tower which are connected together by using pipelines. The desulfurizing tower is a two-stage multi-effect integrated desulfurizing tower, namely the upper section in the tower is a filler-free empty spraying section, and the lower section is a filler section. Chinese patent CN205948639 discloses a hydrogen sulfide removal-high efficiency oxidation regeneration integrated system for sulfur-containing gas, which mainly comprises integrated desulfurization equipment and a regeneration reactor, wherein the regeneration equipment comprises a gravity reactor, and the supergravity reactor comprises any one of a rotary packed bed, a baffling type, a spiral channel, a stator-rotor, and a rotary disc supergravity rotating device. These modifications improve the desulfurization efficiency to some extent, but still have many problems such as how to adjust the pH of the desulfurization solution, and the like.
The pH value of the desulfurization solution needs to be controlled in the conventional desulfurization operation process, the desulfurization efficiency is in direct proportion to the pH value, but if the alkalinity is too high and the pH value is too high, the alkali consumption is increased, the generation speed of secondary salt is increased, and the desulfurization tower is modified on the basis.
Disclosure of Invention
The utility model discloses aim at solving above-mentioned technical problem to a certain extent.
The technical problem solved by the utility model is that the utility model discloses the pH value of doctor solution in the circulation system can be adjusted respectively to two circulation system independent settings, and the waste liquid that the second grade circulating device produced simultaneously discharges into first order circulation, make full use of the doctor solution that contains in the waste liquid, reduced the formation of secondary salt volume simultaneously.
In order to solve the technical problem, the utility model provides a gas desulfurization double-circulation system, which comprises a desulfurization tower, wherein the top of the desulfurization tower is provided with a gas outlet, and the bottom of the desulfurization tower is provided with a gas inlet; the first stage circulating device positioned at the lower section of the desulfurizing tower comprises: a middle sprayer which sprays downwards is arranged in the desulfurization tower, the middle sprayer is downwards provided with a first packing layer and a first rich liquid groove in sequence, the bottom of the first rich liquid groove is communicated with the top inlet of a first-stage regenerator outside the desulfurization tower through a pipeline, and the bottom of the first-stage regenerator is communicated with the middle sprayer through a pipeline; the second stage circulation device comprises: the desulfurization tower is internally provided with an upper sprayer which sprays downwards, a second packing layer is arranged between the upper sprayers downwards, a cavity with a downward second packing layer is communicated with the top of a second liquid-enriched tank positioned outside the desulfurization tower, the side part of the second liquid-enriched tank is communicated with the first liquid-enriched tank through a connecting passage, the bottom part of the second liquid-enriched tank is connected with the top inlet of the second regenerator through a pipeline, and the bottom part of the second regenerator is communicated with the upper sprayer through a pipeline.
Further, a stop valve is arranged on the connecting path.
Further, the first packing layer is provided with at least two layers.
Further, the coal gas outlet is provided with a fan.
Furthermore, a defogging plate is arranged above the upper sprayer.
Furthermore, the filling layers in the second filler layer are double layers and are arranged at intervals.
The technical effects of the utility model reside in that: the utility model provides a two-stage desulfurization circulation system is contained in the coal gas desulfurization double circulation system, the pH values of two-stage desulfurization liquid are different, the desulfurization efficiency is improved, the generation of secondary salt can be effectively reduced, and meanwhile, the two systems independently circulate and can also respectively control the operation parameters; a communicating passage is arranged between the two stages of desulfurization circulating systems, wastewater generated by the second stage of circulation is discharged into the first stage of circulation to participate in the first stage of circulation, and desulfurization liquid contained in the second stage of circulation wastewater can be fully utilized, so that resource waste is reduced, and the wastewater discharge is reduced.
Drawings
FIG. 1 is a schematic structural view of a gas desulfurization double circulation system of the present invention.
Wherein, 1-a desulfurizing tower; 2-a coal gas outlet; 3, a fan; 4-middle sprayer; 5-a first packing layer; 6-a first pregnant solution tank; 7-gas inlet; 9-first stage regenerator; 11-upper spray thrower; 12-a second packing layer; 13-a second rich liquor tank; 17-a second stage regenerator; 18-a shut-off valve; 19-defogging plate.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.
As shown in figure 1, the utility model provides a pair of gas desulfurization dual cycle system, including desulfurizing tower 1, the desulfurizing tower top is equipped with coal gas outlet 2, and coal gas outlet is equipped with fan 3, can provide power for the coal gas fully flows. The lower section and the upper section of the desulfurizing tower are divided into a first-stage circulating device and a second-stage circulating device. The first stage circulation device comprises: desulfurizing tower middle part spray thrower 4, middle part spray thrower 4 sets gradually first packing layer 5 and first rich liquid groove 6 downwards, and first packing layer below is provided with coal gas import 7, and first rich liquid groove 6 bottom is linked together through the top entry of pipeline with the outside first order regenerator 9 of desulfurizing tower 1, and first order regenerator 9 bottom is passed through the pipeline and is linked to each other with middle part spray thrower 4. The second stage cycle comprises: the upper sprayer 11 of the desulfurizing tower is provided with a second packing layer 12 downwards, a cavity of the second packing layer downwards is communicated with the top of a second rich liquid tank 13 positioned outside the desulfurizing tower, a connecting passage is arranged between the side part of the second rich liquid tank 13 and a first rich liquid tank 6, a stop valve 18 is arranged on the connecting passage, whether the first-stage circulation and the second-stage circulation are controlled by the stop valve 18, the second rich liquid tank 13 is connected with a top inlet of a second-stage regenerator 17 through a pipeline, and the bottom of the second-stage regenerator 17 is connected with the upper sprayer 11 through a pipeline.
As shown in fig. 1, a demisting plate 19 is arranged above the upper sprayer 11, so that a large amount of small spray liquid droplets can be prevented from being taken away by the gas, the waste of the spray liquid is reduced, and the corrosion of the spray liquid taken away by the gas to subsequent equipment is also avoided.
As shown in fig. 1, the filler layers in the first filler layer 5 and the second filler layer 12 are double layers, so that the time that the spray liquid falls into the rich liquid tank can be delayed, and the reaction time can be prolonged, so that the reaction can be fully carried out; meanwhile, the double packing layers are arranged at intervals, so that the flowing resistance of coal gas can be reduced, and the overhigh pressure in the desulfurizing tower can be prevented.
In the specific production process, spray liquid enters the desulfurization tower from the middle sprayer 4 and the upper sprayer 11, the spray liquid is sprayed downwards by the sprayers, after the spray liquid is uniformly sprayed out, coal gas enters from a coal gas inlet 7 at the lower part of the desulfurization tower 1, the coal gas reacts with the spray liquid in the upward flowing process, the coal gas is primarily purified and then enters the upper part of the desulfurization tower 1, the spray liquid sprayed out of the middle sprayer 4 reacts with hydrogen sulfide in the coal gas to form rich liquid which falls into a first rich liquid tank 6, the rich liquid in the first rich liquid tank 6 is conveyed to a first regenerator 9 through a pump body, the rich liquid in the first regenerator 9 is desulfurized to form lean liquid which automatically flows to the bottom of the first regenerator 9, and the lean liquid is conveyed to the middle sprayer 4 through the pump body from the bottom of the first regenerator 9 to complete first-stage circulation. The spraying liquid sprayed out of the upper sprayer 11 continuously reacts with the gas which enters the upper part of the desulfurizing tower 1 and is primarily purified, the gas is thoroughly purified and escapes from a gas outlet 2 at the top of the desulfurizing tower, the spraying liquid sprayed out of the upper sprayer 4 continuously reacts with hydrogen sulfide in the gas to form a second rich liquid which falls into a second rich liquid tank 13 outside the desulfurizing tower, then the second rich liquid enters a second regenerator 17 through the pump body, the rich liquid is desulfurized in the second regenerator 17 to form a second barren liquid which automatically flows to the bottom of the second regenerator 17, and the second barren liquid is conveyed to the upper sprayer 11 from the bottom of the second regenerator 17 through the pump body to complete second-stage circulation.
The pH values of the two stages of spraying liquid are different, and the pH value of the spraying liquid in the first stage of circulation is lower. During the reaction with the coal gas, no more secondary salt is generated, the content of hydrogen sulfide in the coal gas is greatly reduced, the pH value of the spray liquid is higher in the second-stage circulation, the absorption effect is ensured, and the generated secondary salt is less because the content of the hydrogen sulfide in the coal gas is low.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.
Claims (6)
1. A coal gas desulfurization double-circulation system comprises a desulfurization tower, wherein a coal gas outlet is formed in the top of the desulfurization tower, and a coal gas inlet is formed in the bottom of the desulfurization tower; the first stage circulating device positioned at the lower section of the desulfurizing tower comprises: a middle sprayer which sprays downwards is arranged in the desulfurization tower, the middle sprayer is downwards provided with a first packing layer and a first rich liquid groove in sequence, the bottom of the first rich liquid groove is communicated with the top inlet of a first-stage regenerator outside the desulfurization tower through a pipeline, and the bottom of the first-stage regenerator is communicated with the middle sprayer through a pipeline; the second stage circulation device comprises: the desulfurization tower is internally provided with an upper sprayer which sprays downwards, a second packing layer is arranged between the upper sprayers downwards, a cavity with a downward second packing layer is communicated with the top of a second pregnant solution tank positioned outside the desulfurization tower, the side part of the second pregnant solution tank is communicated with the first pregnant solution tank through a connecting passage, the bottom part of the second pregnant solution tank is connected with the top inlet of a second regenerator through a pipeline, and the bottom part of the second regenerator is communicated with the upper sprayer through a pipeline.
2. The gas desulfurization dual cycle system according to claim 1, wherein a stop valve is disposed on the connection path.
3. The gas desulfurization dual cycle system of claim 1, wherein the first packing layer is provided with at least two layers.
4. The gas desulfurization dual cycle system of claim 1, wherein the gas outlet is provided with a fan.
5. The dual cycle system for gas desulfurization of claim 1, wherein a demister is disposed above the upper sprayer.
6. The gas desulfurization double circulation system according to claim 1, wherein the filler layer in the second filler layer is double-layered and arranged at intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920469454.1U CN209974698U (en) | 2019-04-09 | 2019-04-09 | Coal gas desulfurization double-circulation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920469454.1U CN209974698U (en) | 2019-04-09 | 2019-04-09 | Coal gas desulfurization double-circulation system |
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| CN209974698U true CN209974698U (en) | 2020-01-21 |
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| CN201920469454.1U Active CN209974698U (en) | 2019-04-09 | 2019-04-09 | Coal gas desulfurization double-circulation system |
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