Methane hydrogen sulfide recycling system and combined treatment system

Abstract

The utility model discloses a methane hydrogen sulfide recycling system and a combined treatment system, which comprise a water tank, a first pipeline, an absorption tower, a second pipeline, a methane inlet pipe, a methane outlet pipe, a third pipeline, a concentration detector and a fourth pipeline, the second pipeline is used for conveying an alkaline solution in the water tank to the absorption tower, the biogas inlet pipe is connected with the absorption tower and used for inputting biogas generated by reaction of the sewage anaerobic reactor, the biogas outlet pipe is connected with the absorption tower and used for being connected with a biogas purification system, and the third pipeline is used for conveying a solution in the absorption tower to the water tank. The concentration detector detects the concentration of sulfur-containing compounds in the alkaline solution in the water tank, and the fourth pipeline is used for conveying the alkaline solution in the water tank to the fermentation system. The system reduces the outsourcing amount of sulfur-containing compounds of a fermentation system, reduces the use amount of sodium carbonate in a biogas purification system, and has the advantage of reducing the production cost.

Description

Technical Field

[0001] The utility model relates to the technical field of biogas treatment, in particular to a biogas hydrogen sulfide recovery and reuse system and a combined treatment system. Background Art

[0002] Sewage treatment equipment is used to treat sewage. The anaerobic reactor in the sewage treatment equipment generates biogas, which needs to be sent to the biogas purification system for purification. Since the biogas generated by the anaerobic reactor contains a high content of hydrogen sulfide, a large amount of sodium carbonate is consumed when the biogas purification system is used to remove hydrogen sulfide, resulting in a high purification cost. Utility Model Content

[0003] In order to solve the above problems, the present application provides a biogas hydrogen sulfide recovery and reuse system and a combined treatment system.

[0004] The present application provides a biogas hydrogen sulfide recovery and reuse system, comprising a water tank, a first pipeline, an absorption tower, a second pipeline, a biogas inlet pipe, a biogas outlet pipe, a third pipeline, a concentration detector and a fourth pipeline, wherein the first pipeline is connected to the water tank, and the first pipeline is used to input an alkaline solution for neutralization reaction with hydrogen sulfide into the water tank, the absorption tower is opposite to the water tank, and the absorption tower is used to make the alkaline solution input therein fully contact with the biogas, the two ends of the second pipeline are respectively connected to the water tank and the absorption tower, the second pipeline is used to transport the alkaline solution in the water tank to the absorption tower, the biogas inlet pipe is connected to the absorption tower, the biogas inlet pipe is used to transport the biogas generated by the reaction of the sewage anaerobic reactor, and the biogas The outlet pipe is connected to the absorption tower, and the biogas outlet pipe is used to connect to the biogas purification system to transport the biogas from which hydrogen sulfide is removed to the biogas purification system. The two ends of the third pipeline are respectively connected to the water tank and the absorption tower. The third pipeline is used to transport the solution in the absorption tower after neutralization reaction with hydrogen sulfide in the biogas to the water tank. The concentration detector is installed on the water tank, and the concentration detector is used to detect the concentration of sulfur-containing compounds in the alkaline solution of the water tank. The fourth pipeline is connected to the water tank, and the fourth pipeline is used to connect to the fermentation system. The fourth pipeline is used to transport the alkaline solution of the water tank to the fermentation system when the concentration of sulfur-containing compounds in the alkaline solution of the water tank reaches above a preset concentration.

[0005] In some embodiments, the biogas hydrogen sulfide recovery and reuse system includes at least two first pipes, at least one first pipe is used to input alkaline concentrate into the water tank, and the remaining first pipes are used to input dilution solvent into the water tank, and the alkaline solution is formed by mixing the alkaline concentrate and the dilution solvent in the water tank.

[0006] In some embodiments, the dilution solvent is process water.

[0007] In some embodiments, the biogas hydrogen sulfide recovery and reuse system comprises:

[0008] Agitator, installed in the water tank.

[0009] In some embodiments, the biogas hydrogen sulfide recovery and reuse system comprises:

[0010] The heating element is installed in the water tank and is used to heat the alkaline solution in the water tank.

[0011] In some embodiments, the biogas hydrogen sulfide recovery and reuse system comprises:

[0012] The thermometer is installed on the water tank and is used to measure the temperature of the alkaline solution in the water tank.

[0013] In some embodiments, the heating element comprises:

[0014] The steam heating coil is passed through the water tank and is used to connect with the steam source;

[0015] Steam flow control valve, installed on the steam heating coil.

[0016] In some embodiments, a circulation pump and a first pressure gauge are sequentially installed along the medium flow direction of the second pipeline.

[0017] In some embodiments, the fourth pipeline is installed with a delivery pump.

[0018] A combined processing system, comprising:

[0019] The above-mentioned biogas hydrogen sulfide recovery and reuse system;

[0020] The sewage treatment equipment is provided with a sewage anaerobic reactor and an output port for outputting biogas generated by the sewage anaerobic reactor, the output port being connected to a biogas inlet pipe;

[0021] A biogas purification system connected to the biogas outlet pipe;

[0022] an alkaline solution source, having an alkaline solution for neutralizing hydrogen sulfide, connected to the first pipeline;

[0023] The fermentation system is connected to the fourth pipeline.

[0024] The beneficial effects of the present application are as follows: a biogas hydrogen sulfide recovery and reuse system is provided, comprising a water tank, a first pipeline, an absorption tower, a second pipeline, a biogas inlet pipe, a biogas outlet pipe, a third pipeline, a concentration detector and a fourth pipeline, an alkaline solution for neutralization reaction with hydrogen sulfide is input into the water tank, the alkaline solution is sent to the absorption tower through the second pipeline, and the biogas generated by the sewage anaerobic reactor reaction enters the absorption tower through the biogas inlet pipe, the biogas is fully contacted with the alkaline solution in the absorption tower, and the hydrogen sulfide in the biogas is neutralized with the alkaline compound in the alkaline solution, the reaction product of the neutralization reaction includes sulfur-containing compounds, the solution containing sulfur-containing compounds is sent back to the water tank through the third pipeline, the solution is circulated and transported between the water tank and the absorption tower, so that the concentration of sulfur-containing compounds in the solution in the water tank is gradually increased, and the sulfur-containing compounds in the alkaline solution in the water tank are detected by the concentration detector. When the concentration of sulfur-containing compounds in the alkaline solution in the water tank reaches above the preset concentration, the alkaline solution in the water tank is transported to the fermentation system through the fourth pipeline to provide sulfur element for the fermentation system. In addition, the remaining gas from which hydrogen sulfide has been removed in the absorption tower is transported to the biogas purification system through the biogas outlet pipe for purification treatment. The biogas hydrogen sulfide recovery and reuse system of the present application can recover and reuse sulfur element of a part of hydrogen sulfide in the biogas before the biogas enters the biogas purification system to provide sulfur element for the fermentation system, thereby reducing the purchase amount of sulfur-containing compounds in the fermentation system, and can also reduce the consumption of sodium carbonate consumed by the biogas purification system for removing hydrogen sulfide, thereby reducing the use of sodium carbonate in the biogas purification system, effectively reducing the desulfurization load of the biogas purification system, having the advantages of reducing production costs, and significantly improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model.

[0026] Figure 1 A schematic diagram of a biogas hydrogen sulfide recovery and reuse system provided in this application.

[0027] The accompanying drawings are marked: 1-water tank, 11-agitator, 12-heating element, 121-steam heating coil, 122-steam flow control valve, 13-temperature gauge, 14-first liquid level gauge, 2-first pipeline, 3-absorption tower, 31-biogas inlet pipe, 311-second pressure gauge, 32-biogas outlet pipe, 33-second liquid level gauge, 4-second pipeline, 41-circulation pump, 42-first pressure gauge, 43-first valve, 5-third pipeline, 51-second valve, 6-concentration detector, 7-fourth pipeline, 71-delivery pump, 100-sewage anaerobic reactor, 200-biogas purification system, 300-fermentation system. DETAILED DESCRIPTION

[0028] Please refer to Figure 1 The present application discloses a biogas hydrogen sulfide recovery and reuse system, including a water tank 1, a first pipeline 2, an absorption tower 3, a second pipeline 4, a biogas inlet pipe 31, a biogas outlet pipe 32, a third pipeline 5, a concentration detector 6 and a fourth pipeline 7.

[0029] The first pipe 2 is connected to the water tank 1, and an alkaline solution is input into the water tank 1 through the first pipe 2. The alkaline solution can react with hydrogen sulfide to neutralize. The two ends of the second pipe 4 are respectively connected to the water tank 1 and the absorption tower 3, and the alkaline solution in the water tank 1 is transported to the absorption tower 3 through the second pipe 4. The absorption tower 3 is opposite to the water tank 1, and the absorption tower 3 is connected with a biogas inlet pipe 31 and a biogas outlet pipe 32. The absorption tower 3 is provided with a biogas inlet connected to the biogas inlet pipe 31, and the absorption tower 3 is provided with a biogas outlet connected to the biogas outlet pipe 32. In some embodiments, the biogas inlet is lower than the biogas outlet. The biogas generated by the reaction of the sewage anaerobic reactor 100 is transported to the absorption tower 3 through the biogas inlet pipe 31, and the alkaline solution and the biogas are fully contacted in the absorption tower 3. In some embodiments, the absorption tower 3 is provided with fillers, and the contact degree between the alkaline solution and the biogas is increased by the fillers. The biogas outlet pipe 32 is connected to the biogas purification system 200, and the biogas from which hydrogen sulfide is removed is transported to the biogas purification system 200 through the biogas outlet pipe 32.

[0030] The two ends of the third pipeline 5 are connected to the water tank 1 and the absorption tower 3 respectively. The solution in the absorption tower 3 is transported to the water tank 1 through the third pipeline 5. The solution in the absorption tower 3 is the solution after the neutralization reaction with the hydrogen sulfide in the biogas.

[0031] The concentration detector 6 is installed on the water tank 1, and the concentration of the sulfur-containing compounds in the alkaline solution of the water tank 1 is detected by the concentration detector 6. The fourth pipeline 7 is connected to the water tank 1. The fourth pipeline 7 is used to be connected to the fermentation system 300. When the concentration of the sulfur-containing compounds in the alkaline solution of the water tank 1 reaches a preset concentration or above, the alkaline solution in the water tank 1 is transported to the fermentation system 300 through the fourth pipeline 7. A delivery pump 71 for transporting the solution is installed on the fourth pipeline 7.

[0032] When the system is in operation, an alkaline solution for neutralization reaction with hydrogen sulfide is input into the water tank 1, and the alkaline solution is sent to the absorption tower 3 through the second pipe 4. The biogas generated by the reaction of the sewage anaerobic reactor 100 enters the absorption tower 3 through the biogas inlet pipe 31. In the absorption tower 3, the biogas is fully in contact with the alkaline solution, and the hydrogen sulfide in the biogas reacts with the alkaline compounds in the alkaline solution. The reaction products of the neutralization reaction include sulfur-containing compounds. The solution containing sulfur-containing compounds is returned to the water tank 1 through the third pipe 5. The solution is circulated and transported between the water tank 1 and the absorption tower 3, so that the concentration of sulfur-containing compounds in the solution in the water tank 1 gradually increases. The concentration of sulfur-containing compounds in the alkaline solution of the water tank 1 is detected by the concentration detector 6. When the concentration of sulfur-containing compounds in the alkaline solution of the water tank 1 reaches or exceeds the preset concentration, the alkaline solution in the water tank 1 is transported to the fermentation system 300 through the fourth pipe 7 to provide sulfur elements for the fermentation system 300. In addition, the remaining gas from which hydrogen sulfide has been removed in the absorption tower 3 is sent to the biogas purification system 200 through the biogas outlet pipe 32 for purification.

[0033] By adopting the biogas hydrogen sulfide recovery and reuse system of the present application, a part of the sulfur element of the hydrogen sulfide in the biogas can be recovered and reused before the biogas enters the biogas purification system 200, and the sulfur element can be provided to the fermentation system 300, thereby reducing the purchase amount of sulfur-containing compounds of the fermentation system 300, and the consumption of sodium carbonate consumed by the biogas purification system 200 for removing hydrogen sulfide can be reduced, thereby reducing the use of sodium carbonate in the biogas purification system 200, effectively reducing the desulfurization load of the biogas purification system 200, having the advantage of reducing production costs and significantly improving economic benefits.

[0034] The alkaline substance in the alkaline solution includes but is not limited to sodium hydroxide and sodium carbonate. When the alkaline substance in the alkaline solution is sodium hydroxide, sodium hydroxide reacts with hydrogen sulfide in the absorption tower 3 to generate sodium hydrosulfide, and the concentration of sodium hydrosulfide in the alkaline solution in the water tank 1 is detected by the concentration detector 6.

[0035] The biogas hydrogen sulfide recovery and reuse system may be provided with a controller, which is connected to the concentration detector 6 by signal, and the controller is controlled and connected to the delivery pump 71 installed on the fourth pipeline 7. When it is determined that the concentration of sulfur-containing compounds in the alkaline solution of the water tank 1 reaches above the preset concentration, the delivery pump 71 is controlled to start, and the alkaline solution with a concentration of sulfur-containing compounds in the water tank 1 reaching above the preset concentration is delivered to the fermentation system 300.

[0036] In some embodiments, the mixed alkaline solution is transported to the water tank 1 through the first pipe 2 .

[0037] In some embodiments, the biogas hydrogen sulfide recovery and reuse system includes at least two first pipes 2, at least one first pipe 2 inputs alkaline concentrate into the water tank 1, and the remaining first pipes 2 input dilution solvent into the water tank 1. The alkaline concentrate and the dilution solvent are mixed in the water tank 1 to form an alkaline solution of a certain concentration, which is used to neutralize hydrogen sulfide. The concentration of the alkaline substance in the solution is adjusted by the dilution solvent, and the dilution solvent can be process water. When the system is applied to a steel plant, the dilution solvent is recommended to be process water generated in the production process of the steel plant.

[0038] In some embodiments, see Figure 1 The biogas hydrogen sulfide recovery and reuse system includes a stirrer 11, which is installed in a water tank 1. The stirrer 11 stirs the alkaline concentrate and the dilution solvent input into the water tank 1 to improve the mixing degree of the alkaline concentrate and the dilution solvent.

[0039] In some embodiments, see Figure 1 The biogas hydrogen sulfide recovery and reuse system includes a heating component 12, which is installed in the water tank 1. The heating component 12 is used to heat the alkaline solution in the water tank 1 to keep the alkaline solution in the water tank 1 at a certain temperature, so that the alkaline solution transported to the absorption tower 3 through the second pipeline 4 is kept at a certain temperature, which is mainly conducive to the neutralization reaction between the alkaline solution and hydrogen sulfide.

[0040] In some embodiments, see Figure 1 The biogas hydrogen sulfide recovery and reuse system includes a thermometer 13, which is used in conjunction with a heating element 12. The thermometer 13 is installed on a water tank 1, and the temperature of the alkaline solution in the water tank 1 is measured by the thermometer 13.

[0041] In some embodiments, see Figure 1 The heating component 12 includes a steam heating coil 121 and a steam flow control valve 122. The steam heating coil 121 is inserted into the water tank 1. The steam heating coil 121 is connected to a steam source. The steam source provides hot steam to the steam heating coil 121. The steam flow control valve 122 is installed on the steam heating coil 121. The flow rate of the hot steam in the steam heating coil 121 is controlled by the steam flow control valve 122, thereby adjusting the heating speed of the solution in the water tank 1 by the heating component 12.

[0042] In some embodiments, the heating element 12 includes a resistance heater and a power supply portion for supplying power to the resistance heater.

[0043] In some embodiments, a circulation pump 41 and a first pressure gauge 42 are sequentially installed along the flow direction of the medium in the second pipeline 4. The first pressure gauge 42 is located after the outlet of the circulation pump 41 along the flow direction of the second pipeline 4. The solution is transported from the water tank 1 to the absorption tower 3 through the circulation pump 41, and the outlet pressure of the circulation pump 41 is displayed by the first pressure gauge 42.

[0044] In some embodiments, see Figure 1 The second pipeline 4 is installed with a first valve 43 . After the flow in the second pipeline 4 flows to the first valve 43 installed at the outlet of the circulation pump 41 , the flow of the second pipeline 4 is controlled by the first valve 43 .

[0045] In some embodiments, see Figure 1 The third pipeline 5 is installed with a second valve 51, and the flow of the third pipeline 5 is controlled by the second valve 51.

[0046] In some embodiments, see Figure 1 The biogas inlet pipe 31 is installed with a second pressure gauge 311 , and the second pressure gauge 311 is close to the absorption tower 3 . The biogas pressure at the biogas inlet of the absorption tower 3 is detected by the second pressure gauge 311 .

[0047] In some embodiments, see Figure 1 The water tank 1 is equipped with a first liquid level meter 14 , and the liquid level in the water tank 1 is detected by the first liquid level meter 14 .

[0048] In some embodiments, see Figure 1 The absorption tower 3 is equipped with a second liquid level meter 33, and the liquid level in the absorption tower 3 is detected by the second liquid level meter 33.

[0049] The present application also discloses a combined treatment system, including a sewage treatment device, a biogas purification system 200, an alkaline solution source, a fermentation system 300 and the above-mentioned biogas hydrogen sulfide recovery and reuse system, wherein the sewage treatment device is provided with a sewage anaerobic reactor 100, and the sewage treatment device is provided with an output port for outputting biogas generated by the reaction of the sewage anaerobic reactor 100, the output port is connected to the biogas inlet pipe 31, and the biogas purification system 200 is connected to the biogas outlet pipe 32. The alkaline solution source has an alkaline solution that reacts with hydrogen sulfide to neutralize, and the alkaline solution source is connected to the first pipeline 2. The fermentation system 300 is connected to the fourth pipeline 7, and the fermentation system 300 can be a fermentation system for producing ethanol by coal gas fermentation, which is a new technology for producing ethanol by continuous bacterial fermentation using carbon monoxide as a carbon source. The alkaline solution source can be a separate alkaline concentrate and a diluting solvent, and the alkaline concentrate and the diluting solvent are respectively sent to the water tank 1, and the alkaline concentrate and the diluting solvent are mixed in the water tank 1 to form an alkaline solution, and the alkaline solution can react with hydrogen sulfide to neutralize. The alkaline solution source may also be an alkaline solution that has been prepared to react with hydrogen sulfide to neutralize the hydrogen sulfide.

[0050] The above-mentioned combined treatment system can recycle and reuse the sulfur element of a part of the hydrogen sulfide in the biogas before the biogas enters the biogas purification system 200, and provide sulfur elements for the fermentation system 300, thereby reducing the purchase amount of sulfur-containing compounds of the fermentation system 300, and can also reduce the consumption of sodium carbonate consumed by the biogas purification system 200 to remove hydrogen sulfide, thereby reducing the use of sodium carbonate in the biogas purification system 200, effectively reducing the desulfurization load of the biogas purification system 200, having the advantage of reducing production costs and significantly improving economic benefits.

[0051] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0052] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A biogas hydrogen sulfide recovery and reuse system, comprising: Water pitcher; A first pipeline is connected to the water tank and is used to input an alkaline solution for neutralizing hydrogen sulfide into the water tank; An absorption tower, opposite to the water tank, used to allow the alkaline solution input therein to fully contact with the biogas; A second pipeline, both ends of which are connected to the water tank and the absorption tower respectively, and is used to transport the alkaline solution in the water tank to the absorption tower; A biogas inlet pipe connected to the absorption tower and used for conveying biogas generated by the sewage anaerobic reactor; A biogas outlet pipe connected to the absorption tower and used to be connected to a biogas purification system to transport the biogas from which hydrogen sulfide has been removed to the biogas purification system; A third pipeline, both ends of which are connected to the water tank and the absorption tower respectively, and is used to transport the solution in the absorption tower after the neutralization reaction with the hydrogen sulfide in the biogas to the water tank; A concentration detector, installed in the water tank, for detecting the concentration of sulfur-containing compounds in the alkaline solution in the water tank; The fourth pipeline is connected to the water tank and is used to be connected to the fermentation system, and is used to transport the alkaline solution in the water tank to the fermentation system when the concentration of the sulfur-containing compounds in the alkaline solution in the water tank reaches above a preset concentration.

2. The biogas hydrogen sulfide recovery and reuse system according to claim 1, characterized in that: The biogas hydrogen sulfide recovery and reuse system includes at least two first pipes, at least one of which is used to input alkaline concentrated solution into the water tank, and the remaining first pipes are used to input dilution solvent into the water tank. The alkaline solution is formed by mixing the alkaline concentrated solution and the dilution solvent in the water tank.

3. The biogas hydrogen sulfide recovery and reuse system according to claim 2, characterized in that: The dilution solvent is process water.

4. The biogas hydrogen sulfide recovery and reuse system according to claim 2, characterized in that: The biogas hydrogen sulfide recovery and reuse system comprises: A stirrer is installed in the water tank.

5. The biogas hydrogen sulfide recovery and reuse system according to claim 2, characterized in that: The biogas hydrogen sulfide recovery and reuse system comprises: A heating element is installed on the water tank and is used to heat the alkaline solution in the water tank.

6. The biogas hydrogen sulfide recovery and reuse system according to claim 5, characterized in that: The biogas hydrogen sulfide recovery and reuse system comprises: A thermometer is installed on the water tank and is used to measure the temperature of the alkaline solution in the water tank.

7. The biogas hydrogen sulfide recovery and reuse system according to claim 5, characterized in that: The heating element comprises: A steam heating coil is passed through the water tank and is used to connect to a steam source; A steam flow control valve is installed on the steam heating coil.

8. The biogas hydrogen sulfide recovery and reuse system according to claim 1, characterized in that: A circulation pump and a first pressure gauge are sequentially installed along the medium flow direction of the second pipeline.

9. The biogas hydrogen sulfide recovery and reuse system according to claim 1, characterized in that: The fourth pipeline is equipped with a delivery pump.

10. A combined processing system, characterized in that: include: The biogas hydrogen sulfide recovery and reuse system according to any one of claims 1 to 9; The sewage treatment equipment is provided with a sewage anaerobic reactor and an output port for outputting biogas generated by the sewage anaerobic reactor, wherein the output port is connected to the biogas inlet pipe; A biogas purification system connected to the biogas outlet pipe; an alkaline solution source, having an alkaline solution for neutralizing hydrogen sulfide, connected to the first pipeline; A fermentation system is connected to the fourth pipeline.

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