Integrated alkali washing desulfurization device

Abstract

The utility model relates to the technical field of biogas desulfurization, and discloses an integrated alkali wash desulfurization device which comprises a circulating tank body, and further comprises a spray tower body and a packed tower body which are arranged in the circulating tank body, and a gas-water separator body is arranged on the right side of the packed tower body; the water supplementing pipe and the alkali supplementing pipe are communicated with the interior of the circulating tank body; the liquid discharging assembly is arranged on one side of the circulating tank body; the first purification assembly is arranged in the spray tower body; the second purification assembly is arranged in the packed tower body; by controlling the pH value of absorption liquid in the circulating tank, hydrogen sulfide in the biogas is quickly converted into sodium hydrosulfide so as to be removed from the biogas, the primary spray tower, the secondary packed tower and the gas-water separator are integrated in the circulating tank, the circulating tank and the circulating pump are arranged on the same base, and the circulating pump is arranged on the circulating tank. Due to the compact design, the occupied area of equipment is greatly reduced, and the engineering construction period is shortened.

Description

Technical Field

[0001] This utility model relates to the field of biogas desulfurization technology, specifically to an integrated alkaline washing desulfurization device. Background Technology

[0002] Biogas contains 50%–80% methane, with a calorific value of approximately 5200–6700 kcal / m³. 3 Biogas is generally used for producing hot water or steam in boilers or for power generation. However, biogas contains hydrogen sulfide during its production process. Direct use of biogas can corrode pipes and equipment, shortening their lifespan. Therefore, hydrogen sulfide must be removed from the biogas first. Currently, there are three relatively mature desulfurization processes: dry desulfurization, chemical desulfurization, and biological desulfurization.

[0003] Dry desulfurization is only suitable for projects with low hydrogen sulfide loads and has high operating costs; chemical desulfurization has a long process flow, large footprint, and long construction period; biological desulfurization equipment has a high initial investment, and the methane concentration and calorific value in the purified gas are reduced. Utility Model Content

[0004] The purpose of this invention is to provide an integrated alkaline washing and desulfurization device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an integrated alkaline washing desulfurization device, including a circulation tank body, and further comprising:

[0006] The spray tower body and the packing tower body are installed inside the circulation tank body. The packing tower body is located on the right side of the spray tower body. A gas-liquid separator body is installed on the right side of the packing tower body. The gas-liquid separator body is located at the top of the circulation tank body. Both the spray tower body and the packing tower body have liquid outlet holes at their lower parts. The liquid outlet holes are located inside the circulation tank body.

[0007] A water supply pipe and an alkali supply pipe are connected inside the circulation tank body, and the water supply pipe and the alkali supply pipe are located on two symmetrical sides at the top of the circulation tank body;

[0008] A drain assembly is installed on one side of the circulation tank body to extract the absorbent liquid from the tank.

[0009] The first purification component, installed inside the spray tower body, is used for primary desulfurization of biogas.

[0010] A second purification component is installed inside the packed tower body for secondary desulfurization of biogas;

[0011] A recovery component installed inside the gas-liquid separator body for utilizing the absorbent liquid.

[0012] Preferably, the drainage assembly includes a support frame fixed to one side of the circulation tank body, and a circulation pump is installed on the inner side of the support frame.

[0013] Preferably, the inlet end of the circulation pump is connected to an outlet pipe, the outlet pipe is connected to the inside of the circulation tank body, the outlet end of the circulation pump is connected to a delivery pipe, and the inner wall of the delivery pipe is connected to a drain pipe.

[0014] Preferably, the first purification component includes a spray tower air inlet pipe connected to the lower part of the spray tower body, a spray tower spray pipe connected to the inner wall of the liquid delivery pipe, the spray tower spray pipe located in the upper part of the spray tower body, a spray tower nozzle connected to the water outlet end of the spray tower spray pipe, and a spray tower air outlet pipe connected to the top of the spray tower body.

[0015] Preferably, the second purification component includes a packed tower inlet pipe connected to one end of the spray tower outlet pipe, the packed tower inlet pipe being located in the lower middle part of the packed tower body, one end of the infusion pipe being connected to a packed tower spray pipe, the packed tower spray pipe being located in the upper middle part of the packed tower body, the water outlet end of the packed tower spray pipe being connected to a packed tower nozzle, the packed tower packing material being disposed inside the packed tower body between the packed tower inlet pipe and the packed tower nozzle, the top of the packed tower body being connected to a packed tower outlet pipe, and a plurality of first jet pipes being disposed at the top of both the packed tower inlet pipe and the spray tower inlet pipe.

[0016] Preferably, the recovery assembly includes a circulation tank inlet pipe connected to one end of the packing tower outlet pipe, the circulation tank inlet pipe passing through the circulation tank body and connecting to the interior of the gas-liquid separator body, gas-liquid separator packing being disposed in the middle of the inner cavity of the gas-liquid separator body, a gas-liquid separator outlet pipe being connected to the top of the gas-liquid separator body, a return liquid pipe being connected to the bottom of the gas-liquid separator body passing through the circulation tank body, and a second jet pipe being connected to the outlet end of the circulation tank inlet pipe.

[0017] Preferably, the tops of both the second jet pipe and the first jet pipe are connected to a protective cover, and the bottom of the protective cover has an air outlet.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] This invention controls the pH of the absorbent in the circulating tank, enabling the rapid conversion of hydrogen sulfide in biogas into sodium hydrosulfide, thus removing it from the biogas. The primary spray tower, secondary packed tower, and gas-liquid separator are integrated within the circulating tank. The circulating tank and circulating pump are mounted on the same base, resulting in a compact design that significantly reduces the equipment's footprint by over 50%, shortening the construction period. The system can be directly installed on-site after factory production and connected to public utility pipelines. The system is simple, stable, and easy to operate and manage. Attached Figure Description

[0020] Figure 1 A schematic diagram of a preferred embodiment of the integrated alkaline washing and desulfurization device provided by this utility model;

[0021] Figure 2 A schematic diagram of the structure of the drainage assembly provided by this utility model;

[0022] Figure 3 A schematic diagram of the structure of the first purification component provided by this utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the second purification component provided by this utility model;

[0024] Figure 5 A schematic diagram of the structure of the recycling component provided by this utility model;

[0025] Figure 6 A schematic diagram of the structure of the protective cover provided by this utility model.

[0026] In the diagram: 1. Circulation tank body; 2. Spray tower body; 3. Packed tower body; 4. Gas-liquid separator body; 5. Water supply pipe; 6. Alkali supply pipe; 7. Drainage assembly; 71. Support frame; 72. Circulation pump; 73. Discharge pipe; 74. Delivery pipe; 75. Drainage pipe; 8. First purification assembly; 81. Spray tower air inlet pipe; 82. Spray tower spray pipe; 83. Spray tower nozzle; 84. Spray tower air outlet pipe; 9. Second purification assembly. Chemical components; 91. Packed tower air inlet pipe; 92. Packed tower spray pipe; 93. Packed tower nozzle; 94. Packed tower packing; 95. Packed tower air outlet pipe; 96. First jet pipe; 10. Recovery components; 101. Circulation tank air inlet pipe; 102. Gas-liquid separator packing; 103. Gas-liquid separator air outlet pipe; 104. Liquid return pipe; 105. Second jet pipe; 11. Liquid outlet hole; 12. Protective cover; 13. Air outlet hole. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1-6 As shown, the integrated alkaline washing desulfurization device includes a circulation tank body 1, which stores the absorbent liquid used for biogas desulfurization and facilitates its recycling. It also includes a spray tower body 2 and a packing tower body 3, both located inside the circulation tank body 1. The packing tower body 3 is positioned to the right of the spray tower body 2, enabling primary desulfurization of biogas via the spray tower body 2 and secondary desulfurization via the packing tower body 3. A gas-liquid separator body 4 is located on the right side of the packing tower body 3, at the top of the circulation tank body 1. This separator allows for the recovery of the absorbent liquid from the desulfurized biogas, enabling its recycling. Both the spray tower body 2 and the packing tower body 3 have outlet holes 11 located inside the circulation tank body 1, allowing the absorbent liquid from the spray tower body 2 and the packing tower body 3 to fall back into the circulation tank body 1.

[0029] The water supply pipe 5 and the alkali supply pipe 6 are connected inside the circulation tank body 1. The water supply pipe 5 and the alkali supply pipe 6 are located on opposite sides of the top of the circulation tank body 1. Since the pH of the absorbent decreases after absorbing hydrogen sulfide, fresh water and alkali can be added to the absorbent in the circulation tank body 1 through the water supply pipe 5 and the alkali supply pipe 6 to restore its absorption capacity.

[0030] A drain assembly 7, installed on one side of the circulation tank body 1, is used to extract the absorbent liquid from the tank. This drain assembly 7 facilitates the discharge of the absorbent liquid into the spray tower body 2 and the packed tower body 3. The drain assembly 7 includes a support frame 71 fixed to one side of the circulation tank body 1, with a circulation pump 72 installed inside the support frame 71. The inlet end of the circulation pump 72 is connected to an outlet pipe 73, which connects to the interior of the circulation tank body 1. The outlet end of the circulation pump 72 is connected to a delivery pipe 74, and the inner wall of the delivery pipe 74 is connected to a drain pipe 75. The support frame 71 supports the installation of the circulation pump. Pump 72 and support frame 71 are fixed on one side of the circulation tank body 1, so that circulation pump 72 can be installed on one side of circulation tank body 1. Circulation pump 72 is used to draw out the absorbent liquid in circulation tank body 1 through outlet pipe 73, and then transport the absorbent liquid through delivery pipe 74. The working principle of circulation pump 72 is existing technology and will not be described in detail here. By setting drain pipe 75, the waste absorbent liquid recovered from biogas desulfurization can be discharged from circulation tank body 1. Then, fresh water and alkaline solution are added to circulation tank body 1 to restore the absorbent liquid's absorption capacity. A control valve is set in drain pipe 75.

[0031] A first purification component 8, installed inside the spray tower body 2, is used for primary desulfurization of biogas. This component allows for primary desulfurization and purification of the biogas. The first purification component 8 includes a spray tower inlet pipe 81 connected to the lower part of the spray tower body 2, a spray tower spray pipe 82 connected to the inner wall of the liquid delivery pipe 74, the spray tower spray pipe 82 located in the upper middle part of the spray tower body 2, a spray tower nozzle 83 connected to the water outlet end of the spray tower spray pipe 82, and a spray tower outlet pipe 83 connected to the top of the spray tower body 2. 4. By setting the air inlet pipe 81 of the spray tower, biogas can be easily introduced into the spray tower body 2. By setting the spray pipe 82 of the spray tower, it can be connected to the liquid delivery pipe 74 to discharge the absorbent into the spray tower body 2 and out of the spray tower nozzle 83. By setting the air outlet pipe 84 of the spray tower, the biogas after primary desulfurization can be easily discharged. The biogas and the sprayed absorbent flow in opposite directions and make full contact with each other. The hydrogen sulfide gas in the biogas reacts with the alkali in the absorbent to generate hydrogen sulfide ions, completing the primary desulfurization. The biogas after coarse desulfurization still contains a certain amount of hydrogen sulfide.

[0032] A second purification component 9, installed inside the packed tower body 3, is used for secondary desulfurization of biogas. This component allows for secondary desulfurization and purification of the biogas after initial desulfurization. The second purification component 9 includes a packed tower inlet pipe 91 connected to one end of the spray tower outlet pipe 84, located in the lower middle part of the packed tower body 3. One end of the liquid delivery pipe 74 is connected to a packed tower spray pipe 92, located in the upper middle part of the packed tower body 3. The outlet end of the spray pipe 92 is connected to a packed tower nozzle 93. The packed tower body 3 contains packed tower packing 94 located between the inlet pipe 91 and the nozzle 93. The top of the packed tower body 3 is connected to a packed tower... The gas outlet pipe 95, through the gas inlet pipe 91 of the packed tower, facilitates the entry of biogas after primary desulfurization into the packed tower body 3. The spray pipe 92 of the packed tower connects to the liquid delivery pipe 74, allowing the absorbent liquid to be discharged into the packed tower body 3 and out through the spray nozzle 93. The biogas and the sprayed absorbent liquid flow counter-currently in the packing 94 of the packed tower, ensuring full gas-liquid contact. The hydrogen sulfide in the biogas is removed to below the required level, completing the secondary desulfurization. The gas outlet pipe 95 facilitates the discharge of biogas after secondary desulfurization. Several first jet pipes 96 are provided at the top of both the gas inlet pipe 91 of the packed tower and the gas inlet pipe 81 of the spray tower. The first jet pipes 96 facilitate the dispersion of biogas and increase the contact surface with the sprayed absorbent liquid.

[0033] A recovery component 10, installed inside the gas-liquid separator body 4, is used to utilize the absorbent liquid. The recovery component 10 facilitates the recovery of the absorbent liquid waste from the desulfurized biogas. The recovery component 10 includes a circulation tank inlet pipe 101 connected to one end of the packing tower outlet pipe 95. The circulation tank inlet pipe 101 penetrates the circulation tank body 1 and connects to the interior of the gas-liquid separator body 4. Gas-liquid separator packing 102 is installed in the middle of the inner cavity of the gas-liquid separator body 4, and a gas-liquid separator outlet pipe is connected to the top of the gas-liquid separator body 4. 103. The bottom of the gas-water separator body 4 is connected to the circulation tank body 1 via a return pipe 104. The outlet end of the circulation tank inlet pipe 101 is connected to a second jet pipe 105. By setting the circulation tank inlet pipe 101, the biogas after secondary desulfurization can be easily discharged into the gas-water separator body 4. After the biogas passes through the gas-water separator packing 102, the droplets are captured on the filter layer. The dehydrated gas is led to the downstream equipment from the gas-water separator outlet pipe 103. After the droplets gather, they fall into the circulation tank body 1 through the return pipe 104 at the bottom of the gas-water separator body 4.

[0034] The tops of the second jet pipe 105 and the first jet pipe 96 are connected to a protective cover 12. The bottom of the protective cover 12 is provided with an air outlet 13. By setting the protective cover 12, the falling absorbent liquid can be prevented from falling into the second jet pipe 105 and the first jet pipe 96. By setting the air outlet 13, the biogas in the second jet pipe 105 and the first jet pipe 96 can be discharged easily.

[0035] Working principle: Biogas containing hydrogen sulfide enters the spray tower body 2 through the spray tower inlet pipe 81. The circulation pump 72 sprays the absorbent liquid in the circulation tank body 1 onto the top of the spray tower body 2 through the spray tower spray pipe 82 and spray tower nozzle 83. The biogas and spray liquid flow in opposite directions, making full contact between the gas and liquid. The hydrogen sulfide gas in the biogas reacts with the alkali in the absorbent liquid to generate hydrogen sulfide ions, completing the first stage of desulfurization. The biogas after coarse desulfurization still contains a certain amount of hydrogen sulfide. After the biogas exits from the spray tower outlet pipe 84, it enters the packed tower body 3 through the packed tower inlet pipe 91, which is connected to the spray tower outlet pipe 84. At the same time, the circulation pump 72 sprays the absorbent liquid in the circulation tank body 1 onto the top of the packed tower body 3 through the packed tower spray pipe 92 and packed tower nozzle 93. The biogas and spray liquid react in a counter-current manner. In the counter-current flow, the gas and liquid in the packing 94 of the packed tower are in full contact. The hydrogen sulfide in the biogas is removed to below the required level, completing the secondary desulfurization. The desulfurized biogas, carrying the absorbent liquid, enters the gas-liquid separator body 4 from the gas outlet pipe 95 of the packed tower through the gas inlet pipe 101 of the circulation tank. After the biogas passes through the packing 102 of the gas-liquid separator, the droplets are captured on the filter layer. The dehydrated gas is led to the downstream equipment from the gas outlet pipe 103 of the gas-liquid separator. After the droplets gather, they fall into the circulation tank body 1 through the return liquid pipe 104 at the bottom of the gas-liquid separator body 4. After absorbing hydrogen sulfide, the pH of the absorbent liquid decreases. After some waste liquid is discharged from the drain pipe 75 after the circulation pump 72, fresh water and alkali are added to the absorbent liquid in the circulation tank body 1 through the water replenishment pipe 5 and the alkali replenishment pipe 6 to restore the absorbent liquid's absorption capacity.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0037] Although embodiments of the present invention 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 to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An integrated alkaline washing desulfurization device, comprising a circulating tank body (1), characterized in that, Also includes: The spray tower body (2) and the packing tower body (3) are installed inside the circulation tank body (1). The packing tower body (3) is located on the right side of the spray tower body (2). A gas-water separator body (4) is installed on the right side of the packing tower body (3). The gas-water separator body (4) is located at the top of the circulation tank body (1). Both the spray tower body (2) and the packing tower body (3) have liquid outlet holes (11) at their lower parts. The liquid outlet holes (11) are located inside the circulation tank body (1). The water supply pipe (5) and the alkali supply pipe (6) are connected inside the circulating tank body (1), and the water supply pipe (5) and the alkali supply pipe (6) are located on opposite sides of the top of the circulating tank body (1); A drain assembly (7) is installed on one side of the circulation tank body (1) to extract the absorbent liquid in the tank; The first purification component (8) is installed inside the spray tower body (2) for primary desulfurization of biogas; The second purification component (9) is installed inside the packed tower body (3) for secondary desulfurization of biogas; A recovery component (10) is installed inside the gas-liquid separator body (4) for utilizing the absorbent liquid.

2. The integrated alkaline washing desulfurization device according to claim 1, characterized in that: The drainage assembly (7) includes a support frame (71) fixed to one side of the circulation tank body (1), and a circulation pump (72) is installed on the inner side of the support frame (71).

3. The integrated alkaline washing desulfurization device according to claim 2, characterized in that: The inlet end of the circulating pump (72) is connected to the outlet pipe (73), which is connected to the inside of the circulating tank body (1). The outlet end of the circulating pump (72) is connected to the delivery pipe (74), and the inner wall of the delivery pipe (74) is connected to the drain pipe (75).

4. The integrated alkaline washing desulfurization device according to claim 3, characterized in that: The first purification component (8) includes a spray tower air inlet pipe (81) connected to the lower part of the spray tower body (2), a spray tower spray pipe (82) connected to the inner wall of the liquid delivery pipe (74), the spray tower spray pipe (82) located in the upper part of the spray tower body (2), the water outlet end of the spray tower spray pipe (82) connected to the spray tower nozzle (83), and a spray tower air outlet pipe (84) connected to the top of the spray tower body (2).

5. The integrated alkaline washing desulfurization device according to claim 4, characterized in that: The second purification component (9) includes a packing tower inlet pipe (91) connected to one end of the spray tower outlet pipe (84). The packing tower inlet pipe (91) is located in the lower middle part of the packing tower body (3). One end of the infusion pipe (74) is connected to a packing tower spray pipe (92). The packing tower spray pipe (92) is located in the upper middle part of the packing tower body (3). The water outlet end of the packing tower spray pipe (92) is connected to a packing tower nozzle (93). The packing tower body (3) is provided with packing tower packing (94) located between the packing tower inlet pipe (91) and the packing tower nozzle (93). The top of the packing tower body (3) is connected to a packing tower outlet pipe (95). The top of both the packing tower inlet pipe (91) and the spray tower inlet pipe (81) is provided with several first jet pipes (96).

6. The integrated alkaline washing desulfurization device according to claim 1, characterized in that: The recovery assembly (10) includes a circulation tank inlet pipe (101) connected to one end of the packing tower outlet pipe (95). The circulation tank inlet pipe (101) passes through the circulation tank body (1) and connects to the interior of the gas-water separator body (4). The gas-water separator packing (102) is provided in the middle of the inner cavity of the gas-water separator body (4). The top of the gas-water separator body (4) is connected to the gas-water separator outlet pipe (103). The bottom of the gas-water separator body (4) passes through the circulation tank body (1) and connects to the return liquid pipe (104). The outlet end of the circulation tank inlet pipe (101) is connected to the second jet pipe (105).

7. The integrated alkaline washing desulfurization device according to claim 6, characterized in that: The top of the second jet pipe (105) and the first jet pipe (96) are connected to a protective cover (12), and the bottom of the protective cover (12) is provided with an air outlet (13).

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