CN219429713U - Sulfur recovery system for sulfuric acid gas - Google Patents
Sulfur recovery system for sulfuric acid gas Download PDFInfo
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- CN219429713U CN219429713U CN202320376777.2U CN202320376777U CN219429713U CN 219429713 U CN219429713 U CN 219429713U CN 202320376777 U CN202320376777 U CN 202320376777U CN 219429713 U CN219429713 U CN 219429713U
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Abstract
The utility model relates to a sulfur recovery system for sulfuric acid gas; the system comprises a sulfuric acid gas-containing condensate pretreatment unit and a coal chemical sulfur acid gas-containing pipeline, wherein the sulfuric acid gas pipeline of the sulfuric acid gas-containing condensate pretreatment unit and the coal chemical sulfur acid gas-containing pipeline are respectively connected with an acid-making unit through an acid-making combustion furnace, and a tail gas outlet of the acid-making unit is connected with a boiler; the acid making combustion furnace comprises a furnace body, wherein the front part of the furnace body is provided with a burner, the top of the tail end of the furnace body is provided with an acid making combustion furnace tail gas outlet connected with an acid making unit, and the burner is provided with a fuel gas inlet, a combustion air inlet and a sulfuric acid gas inlet; the sulfuric acid gas generated in the coal chemical industry or the acid gas pretreated by the condensate can be fully combusted through the acid making combustion furnace, sulfur-containing components are converted into sulfur oxides, and the acid making is carried out through the acid making unit in the later period, so that the recycling of the acid gas is realized.
Description
Technical Field
The utility model relates to the technical field of sulfur acid gas treatment in coal chemical industry, in particular to a sulfur recovery system for sulfuric acid gas.
Background
Sulfuric acid gas or condensate containing sulfuric acid gas is inevitably generated in the coal chemical industry, for example: after a series of processes of impurity removal and refining of crude synthesis gas from gasification stations, production stations such as a conversion station, a low-temperature methanol washing station and the like in the coal chemical industry produce a certain amount of condensate containing sulfur acid gas; in order to reduce the treatment cost of acid gas or acid gas condensate and avoid the defect of environmental pollution caused by toxic gas generated by torch combustion, the patent number: 202221532155.6, patent name: a coal chemical industry transformation acid gas treatment device; the patent discloses that after the condensate containing the acid gas is stripped by a stripping tower, the acid gas is sent into a boiler to burn, the treated acid gas is discharged outside, and the tail gas of the boiler is subjected to gas-liquid separation to realize recycling according to the property of the tail gas; in the process, the cost can be reduced, and the pollution of toxic gas to the environment is reduced; but the method also has the problem that the acid gas cannot be recycled, so that the resource waste is caused.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art and provide a sulfuric acid gas sulfur recovery system which is suitable for treating sulfur acid gas and sulfur acid gas-containing condensate so as to realize effective utilization of acid gas in the coal chemical industry.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
the sulfuric acid gas recovery system comprises a sulfuric acid gas condensate pretreatment unit and a coal chemical sulfur acid gas pipeline, wherein the sulfuric acid gas pipeline of the sulfuric acid gas condensate pretreatment unit and the coal chemical sulfur acid gas pipeline are respectively connected with an acid production unit through an acid production combustion furnace, and a tail gas outlet of the acid production unit is connected with a boiler; the acid making combustion furnace comprises a furnace body, wherein the front part of the furnace body is provided with a burner, the top of the tail end of the furnace body is provided with an acid making combustion furnace tail gas outlet connected with an acid making unit, and the burner is provided with a fuel gas inlet, a combustion air inlet and a sulfuric acid gas inlet; and a sulfuric acid gas pipeline of the sulfuric acid gas-containing condensate pretreatment unit and a sulfuric acid gas pipeline of the coal chemical industry are respectively connected with a sulfuric acid gas inlet.
The beneficial effects of the utility model are as follows: the sulfuric acid gas generated in the coal chemical industry or the acid gas pretreated by the condensate containing the sulfuric acid gas can be fully combusted by arranging the acid making combustion furnace, so that the sulfur-containing component is converted into sulfur oxide, and the acid making is conveniently carried out through an acid making unit in the later stage, so that the recycling of the acid gas is realized; meanwhile, tail gas of the acid making unit is combusted through a boiler, so that the aim of environmental friendliness is fulfilled; the acid gas inlet in the acid making combustion furnace is used for receiving the sulfuric acid gas directly generated in the coal chemical industry or the sulfuric acid gas after the condensate is pretreated, and has the characteristics of wide application range and capability of recycling the acid gas.
As a further preferable mode of the technical scheme, the sulfuric acid gas-containing condensate pretreatment unit comprises a stripping tower, wherein an inlet of the stripping tower is connected with the tail end of a sulfuric acid gas-containing condensate pipeline, a gas phase outlet of the stripping tower is connected with an inlet of a gas-liquid separator through a heat exchanger, and a gas phase outlet of the gas-liquid separator is connected with a sulfuric acid gas inlet of a burner.
As a further preferable mode of the technical scheme, the condensate pipeline containing the sulfuric acid gas is connected with a condensate outlet of a conversion section in the coal chemical industry through a first regulating valve; the lower inlet of the stripping tower is connected with a gasification flash evaporation gas pipe network; the sulfur-containing acid gas pipeline in the coal chemical industry is connected with a sulfur-containing acid gas outlet of the low-temperature methanol washing section.
As a further preferable mode of the technical scheme, a second regulating valve and a first gate valve are arranged between the gas phase outlet and the sulfuric acid gas inlet of the gas-liquid separator; a first tee joint is arranged between the second regulating valve and the first gate valve, and a third end of the first tee joint is connected with the acid torch device through the second gate valve.
The beneficial effects are that: according to the utility model, the gas-liquid separator is arranged to realize gas-liquid separation of the cooled gas from the stripping tower, so that the aim of reducing the load of the acid-making combustion furnace is fulfilled; meanwhile, by arranging the acid torch device, the acid gas can be treated in an emergency when the acid making combustion furnace is overhauled, stopped or fully loaded.
As a further preferable mode of the technical scheme, a second tee joint is arranged between the second regulating valve and the first tee joint, and a third end of the second tee joint is connected with a nitrogen pipeline through a third gate valve.
The beneficial effects are that: when the utility model is required to be overhauled or in a shutdown state, the pipeline between the gas phase outlet of the gas-liquid separator and the sulfuric acid gas inlet is purged through the nitrogen pipeline, so that the defect of pipeline corrosion caused by the retention of acid gas in the pipeline is avoided.
As a further preferable mode of the technical scheme, the acid making unit comprises an oxidation reactor connected with an exhaust outlet of the acid making combustion furnace, an outlet of the oxidation reactor is connected with a sulfuric acid steam condenser, an outlet of the sulfuric acid steam condenser is connected with a sulfuric acid storage tank, and an exhaust outlet of the sulfuric acid steam condenser is connected with a boiler.
As a further preferable mode of the technical scheme, an acid mist catcher is arranged between the tail gas outlet of the sulfuric acid steam condenser and the boiler.
The beneficial effects are that: sulfuric acid can be entrained in tail gas after the acid making unit, and the sulfuric acid can be collected by arranging the acid mist catcher, so that the aim of standard emission of the tail gas after heat recovery by boiler combustion is fulfilled.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Detailed Description
The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.
Referring to fig. 1, the present utility model is a sulfuric acid gas sulfur recovery system, characterized in that: the recovery system comprises a sulfuric acid gas-containing condensate pretreatment unit and a coal chemical sulfur acid gas-containing pipeline, wherein the sulfuric acid gas pipeline of the sulfuric acid gas-containing condensate pretreatment unit and the coal chemical sulfur acid gas-containing pipeline are respectively connected with an acid-making unit through an acid-making combustion furnace, and a tail gas outlet of the acid-making unit is connected with a boiler 8; the acid making combustion furnace comprises a furnace body 2, wherein a burner 3 is arranged at the front part of the furnace body 2, a tail gas outlet 4 of the acid making combustion furnace connected with an acid making unit is arranged at the top of the tail end of the furnace body 2, and a fuel gas inlet 5, a combustion air inlet 6 and a sulfuric acid gas inlet 7 are arranged on the burner 3; the sulfuric acid gas pipeline of the sulfuric acid gas-containing condensate pretreatment unit and the sulfuric acid gas pipeline of the coal chemical industry are respectively connected with the sulfuric acid gas inlet 7. The utility model is used for treating sulfuric acid gas or condensate containing sulfuric acid gas which is directly discharged in the coal chemical industry so as to realize recycling of acid, in particular to the sulfuric acid gas inlet 7 which can be directly connected with acid gas generated in other coal chemical industry, can also be connected with the condensate containing sulfuric acid gas through a condensate pretreatment unit containing sulfuric acid gas, can realize conversion of sulfur components into sulfur oxides through full combustion of an acid making combustion furnace, can prepare the sulfur oxides into sulfuric acid through the acid making unit, and can realize the purpose of reaching the standard discharge after the tail gas of the acid making unit is combusted through a boiler to recover heat.
Further, the sulfuric acid gas-containing condensate pretreatment unit comprises a stripping tower 1, wherein an inlet of the stripping tower 1 is connected with the tail end of a sulfuric acid gas-containing condensate pipeline, a gas phase outlet of the stripping tower 1 is connected with an inlet of a gas-liquid separator 10 through a heat exchanger 9, and a gas phase outlet of the gas-liquid separator 10 is connected with a sulfuric acid gas inlet 7 of the burner 3. The condensate containing sulfur acid gas discharged from each working section of the coal chemical industry is sent to a stripping tower 1 to strip the acid gas dissolved in the condensate by using high-pressure flash steam, low-pressure flash steam or low-pressure steam of other positions; the tail gas of the stripping tower 1 is subjected to heat exchange and cooling to about 60 ℃ through a gas phase outlet of the stripping tower 1 and a heat exchanger 9, and finally gas-liquid separation is realized through a gas-liquid separator 10, and gas-phase acid gas after gas-liquid separation enters a burner 3 through a sulfuric acid gas inlet 7, is mixed with fuel gas and combustion air, and then enters a furnace body 2 of an acid-making combustion furnace for full combustion, so that sulfur components are converted into sulfur oxides.
Further, the condensate pipeline containing the sulfuric acid gas is connected with a condensate outlet of the conversion section 11 in the coal chemical industry through a first regulating valve 19; the lower inlet of the stripping tower 1 is connected with a gasification flash steam pipe network 12; the coal chemical sour gas conduit is connected to the sour gas outlet of the low temperature methanol scrubbing section 26. The condensate containing the sulfuric acid gas can come from the condensate in the conversion section 11 in the coal chemical industry, and the condensate is subjected to flow regulation through the first regulating valve 19 so as to meet the working load of the stripping tower 1; and enabling the gasified flash gas in the gasified flash gas pipe network 12 to enter the stripping tower 1 to strip the acid gas dissolved in the condensate; the sulfur-containing acid gas in the sulfur-containing acid gas pipeline in the coal chemical industry can come from the low-temperature methanol washing section 26, and the sulfur-containing acid gas in the low-temperature methanol washing section 26 can directly enter the acid-making combustion furnace for combustion.
Further, a second regulating valve 20 and a first gate valve 21 are arranged between the gas phase outlet of the gas-liquid separator 10 and the sulfuric acid gas inlet 7; a first tee joint 24 is arranged between the second regulating valve 20 and the first gate valve 21, and the third end of the first tee joint 24 is connected with the acid flare apparatus 13 through the second gate valve 22. The acid flare device 13 is arranged to realize that redundant acid gas is burnt and discharged through the acid flare device 13 when the acid making combustion furnace runs at full load; and when the acid making combustion furnace is overhauled or stopped, the emergency emission of acid gas can be realized.
Further, a second tee 25 is arranged between the second regulating valve 20 and the first tee 24, and a third end of the second tee 25 is connected with the nitrogen pipeline 14 through a third gate valve 23. According to the utility model, the nitrogen pipeline 14 is arranged between the gas phase outlet of the gas-liquid separator 10 and the sulfuric acid gas inlet 7, so that the purpose of nitrogen purging is achieved, and the device can play a role in maintaining equipment and reducing corrosion in production working conditions such as driving, overhauling and the like.
Further, the acid making unit comprises an oxidation reactor 15 connected with the tail gas outlet 4 of the acid making combustion furnace, the outlet of the oxidation reactor 15 is connected with a sulfuric acid steam condenser 16, the outlet of the sulfuric acid steam condenser 16 is connected with a sulfuric acid storage tank 17, and the tail gas outlet of the sulfuric acid steam condenser 16 is connected with the boiler 8. The tail gas after burning in the acid making combustion furnace is sent to the oxidation reactor 15, sulfur dioxide is oxidized into sulfur trioxide, then the sulfur trioxide enters the sulfuric acid steam condenser 16 to be absorbed by water to prepare sulfuric acid, the redundant tail gas in the sulfuric acid steam condenser 16 is sent to the boiler 8 to be burnt and recycled to generate heat, and the tail gas after burning can reach the emission standard.
Further, an acid mist catcher 18 is arranged between the tail gas outlet of the sulfuric acid steam condenser 16 and the boiler 8. The utility model can realize the absorption of sulfuric acid entrained in tail gas in an acid making unit by arranging the acid mist catcher 18; under the dual functions of recycling sulfuric acid prepared and absorbing sulfuric acid carried in tail gas, the standard emission of the tail gas of the boiler is realized.
The working principle of the utility model is as follows: step 1: acid gas, combustion air and fuel gas generated in enterprises in coal chemical industry enter the burner 3 through a sulfuric acid gas inlet 7, a combustion air inlet 6 and a fuel gas inlet 5 on the burner 3 respectively, and are fully combusted after being mixed by entering a furnace body 2 of an acid making combustion furnace, so that sulfur-containing components are converted into sulfur oxides; when the utility model is in a driving stage, the fuel gas can be dimethyl ether, and when the utility model is in a normal operation stage, the fuel gas can be methanol synthesis purge gas and/or liquid nitrogen washing fuel gas, and the pressure of the fuel gas can be 0.3-0.4 kpa; pressure of combustion airCan be about 300 kpa; step 2: the tail gas after combustion in the acid making combustion furnace is sent to an oxidation reactor 15 to oxidize sulfur dioxide into sulfur trioxide, and then enters a sulfuric acid steam condenser 16 to make the sulfur trioxide undergo the process of water absorption to prepare sulfuric acid; step 3: the sulfuric acid enters a sulfuric acid storage tank 17 for storage, the tail gas is subjected to secondary absorption on a small amount of sulfuric acid in the tail gas through an acid mist catcher 18 and then is sent into a boiler 8 for combustion, the boiler is combusted for recycling heat, and the combusted tail gas reaches the standard and is discharged; the standard emission refers to SO in tail gas 2 The content is not more than 10mg/Nm 3 NOX content of not more than 15mg/Nm 3 And the content of sulfuric acid mist is not more than 3mg/Nm 3 The method comprises the steps of carrying out a first treatment on the surface of the Step 4: in the case of the condensate containing sulfur acid gas, the condensate is preferably the condensate generated by the conversion section 11 in the coal chemical industry, the condensate enters the stripping tower 1 after being subjected to flow adjustment by the first adjusting valve 19, the acid gas dissolved in the condensate is stripped by using high-pressure flash steam and low-pressure flash steam or low-pressure steam of other posts, the tail gas in the stripping tower 1 is cooled to about 60 ℃ through the gas phase outlet of the stripping tower 1 and the heat exchange of the heat exchanger 9, the gas-liquid separation is finally realized through the gas-liquid separator 10, and the acid gas after the gas-liquid separation is introduced into the sulfuric acid gas inlet 7. Step 5: the tail gas of the sulfur-containing acid gas pipeline in the coal chemical industry, which is from the low-temperature methanol washing section 26, can directly enter the sulfuric acid making combustion furnace through the sulfuric acid gas inlet 7 in the step 1; step 6: in production working conditions such as starting, overhauling and the like, nitrogen is introduced through the nitrogen pipeline 14 to purge the pipeline so as to play a role in maintaining equipment and reducing corrosion; step 7: when the acid making combustion furnace overhauls, stops running or runs at full load, the second gate valve 22 is opened to achieve the purposes of emergency emission or meeting the running load of the acid making combustion furnace.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A sulfur recovery system for sulfuric acid gas, characterized by: the recovery system comprises a sulfuric acid gas-containing condensate pretreatment unit and a coal chemical sulfur acid gas-containing pipeline, wherein the sulfuric acid gas pipeline of the sulfuric acid gas-containing condensate pretreatment unit and the coal chemical sulfur acid gas-containing pipeline are respectively connected with an acid-making unit through an acid-making combustion furnace, and a tail gas outlet of the acid-making unit is connected with a boiler (8);
the acid making combustion furnace comprises a furnace body (2), wherein a burner (3) is arranged at the front part of the furnace body (2), an acid making combustion furnace tail gas outlet (4) connected with an acid making unit is arranged at the top of the tail end of the furnace body (2), and a fuel gas inlet (5), a combustion air inlet (6) and a sulfuric acid gas inlet (7) are arranged on the burner (3);
the sulfuric acid gas pipeline of the sulfuric acid gas-containing condensate pretreatment unit and the sulfuric acid gas pipeline of the coal chemical industry are respectively connected with a sulfuric acid gas inlet (7).
2. A sulfuric acid gas sulfur recovery system as defined in claim 1 wherein: the condensate pretreatment unit for the sulfur-containing acid gas comprises a stripping tower (1), wherein an inlet of the stripping tower (1) is connected with the tail end of a condensate pipeline for the sulfur-containing acid gas, a gas phase outlet of the stripping tower (1) is connected with an inlet of a gas-liquid separator (10) through a heat exchanger (9), and a gas phase outlet of the gas-liquid separator (10) is connected with an acid gas inlet (7) of a burner (3).
3. A sulfuric acid gas sulfur recovery system as defined in claim 2 wherein: the condensate pipeline containing the sulfuric acid gas is connected with a condensate outlet of a conversion working section (11) in the coal chemical industry through a first regulating valve (19); the lower inlet of the stripping tower (1) is connected with a gasification flash steam pipe network (12);
the sulfur-containing acid gas pipeline of the coal chemical industry is connected with a sulfur-containing acid gas outlet of a low-temperature methanol washing working section (26).
4. A sulfuric acid gas sulfur recovery system as defined in claim 2 wherein: a second regulating valve (20) and a first gate valve (21) are arranged between the gas phase outlet of the gas-liquid separator (10) and the sulfuric acid gas inlet (7);
a first tee joint (24) is arranged between the second regulating valve (20) and the first gate valve (21), and the third end of the first tee joint (24) is connected with the acid torch device (13) through the second gate valve (22).
5. A sulfuric acid gas sulfur recovery system as defined in claim 4 wherein: a second tee joint (25) is arranged between the second regulating valve (20) and the first tee joint (24), and a third end of the second tee joint (25) is connected with the nitrogen pipeline (14) through a third gate valve (23).
6. A sulfuric acid gas sulfur recovery system as defined in claim 1 wherein: the acid making unit comprises an oxidation reactor (15) connected with an acid making combustion furnace tail gas outlet (4), wherein the outlet of the oxidation reactor (15) is connected with a sulfuric acid steam condenser (16), the outlet of the sulfuric acid steam condenser (16) is connected with a sulfuric acid storage tank (17), and the tail gas outlet of the sulfuric acid steam condenser (16) is connected with a boiler (8).
7. A sulfuric acid gas sulfur recovery system as defined in claim 6 wherein: an acid mist catcher (18) is arranged between the tail gas outlet of the sulfuric acid steam condenser (16) and the boiler (8).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320376777.2U CN219429713U (en) | 2023-03-03 | 2023-03-03 | Sulfur recovery system for sulfuric acid gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320376777.2U CN219429713U (en) | 2023-03-03 | 2023-03-03 | Sulfur recovery system for sulfuric acid gas |
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