Multistage impurity gas treatment and recycling system for methane-containing mixed gas

Abstract

The utility model relates to the technical field of mixed gas purification treatment, in particular to a multi-stage impurity gas treatment and recycling system for methane-containing mixed gas, which comprises a gas inlet pipeline for collecting mixed gas and conveying the mixed gas to a purification device; the purification device comprises a pre-treatment device, a primary filtering device, a biological purification device and a membrane separation device which are communicated in sequence; the biological purification device comprises a microorganism purification vessel used for consuming and treating gases such as H2S and NH3, the membrane separation device comprises a separation cavity, and a separation membrane allowing CH4 to penetrate through is arranged in the separation cavity; the storage device comprises a plurality of storage tanks for storing CH4; and the recycling device is used for obtaining CH4 for combustion power generation or combustion heat supply. Original acid and alkaline gas and other impurities are removed through the purification device, combustible gas containing CH4 is obtained and recycled, combustion power generation or combustion heat supply is carried out when needed, the waste gas reutilization rate is greatly increased, and pollution hazards to the environment are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of mixed gas purification and treatment, in particular to a multi-stage impurity gas treatment and recycling system for mixed gas containing methane. Background Art

[0002] In some solid waste treatment projects, the treated waste gas is rich in various gases, such as sulfur-containing gases such as H2S, nitrogen-containing gases such as NH3, and carbon-containing gases such as CH4. Each type of gas has its own separate application and should be separated and treated. In particular, CH4 gas can be used as combustion gas in the fields of heating and power generation. Therefore, the CH4 component in the waste gas should be recovered and applied.

[0003] However, current solid waste treatment projects typically treat waste gas through centralized purification, without separation and recycling. This results in significant waste of fuel gas, and some gases are even insufficiently purified, causing environmental pollution upon discharge. Therefore, current waste gas treatment solutions still require significant improvement and should be optimized to enhance the separation and recycling of various active components in waste gas, increase waste gas recovery rates, and reduce environmental pollution. Therefore, a more rational technical solution is needed to address the technical issues currently facing existing technologies. Utility Model Content

[0004] To overcome at least one of the above-mentioned deficiencies, the present invention proposes a multi-stage impurity gas treatment and recovery system for a methane-containing mixed gas. By subjecting the mixed gas to multi-stage treatments such as purification and separation, the different components are separated, and CH4 is recovered and utilized as combustion gas for heat supply or power generation.

[0005] In order to achieve the above-mentioned purpose, the treatment and recycling system disclosed in the present utility model can adopt the following technical solutions:

[0006] The multi-stage impurity gas treatment and recovery system for methane-containing mixed gas includes:

[0007] Inlet pipe, used to collect the mixed gas and transport it to the purification device;

[0008] The purification device includes a pre-treatment device, a primary filtration device, a biological purification device, and a membrane separation device connected in sequence; the biological purification device includes a microbial purification dish for consuming and treating H2S and a microbial purification dish for consuming and treating NH3; the membrane separation device includes a separation chamber, in which a separation membrane that allows CH4 to pass is disposed, and the separation membrane divides the separation chamber into two independent chambers. After passing through the separation membrane, CH4 enters one of the independent chambers and is controlled and transported to a storage device;

[0009] A storage device, including a plurality of storage tanks for storing CH4;

[0010] The recycling device is connected to the storage device and obtains CH4 from the storage device for combustion to generate electricity or combustion to provide heat.

[0011] The recycling and utilization system disclosed above collects the mixed gas generated after the solid waste treatment through the intake pipe and transports it to the subsequent purification device for purification and removal of some toxic and harmful substances, and continues to transport the useful gas containing CH4 backward for storage and reuse, which facilitates the recycling of resources and reduces pollution to the environment.

[0012] Furthermore, the air inlet pipeline may include a trumpet-shaped air collecting port, in which a negative pressure blower is provided for absorbing the exhaust gas. The air collecting port is connected to the air delivery path and delivers the gas to the purification device.

[0013] Furthermore, the recycling device may use a thermal generator to generate electricity through combustion, or may use a boiler system to provide heat by burning the recovered useful gas containing CH4.

[0014] Furthermore, a pre-treatment device is used to pre-treat the mixed gas, with the main purpose of removing some harmful gases and reducing impurities such as particulate matter in the mixed gas. It can adopt a variety of structures, and the specific structure is not limited to a single one. Here, we optimize and propose one feasible option: the pre-treatment device includes an acid tank and an alkali tank. The pre-treatment device is used to pass the mixed gas into the acid tank and the alkali tank in sequence to initially neutralize and absorb the alkaline and acidic gases in the mixed gas. When adopting the above solution, liquid substances can be stored in the acid tank and the alkali tank. The mixed gas is passed into the liquid substances to obtain acid washing or alkali washing, thereby removing some substances therein. Solid substances with corresponding pH values ​​can also be placed in the acid tank and the alkali tank. When the mixed gas passes through the gaps between the solid substances, some impurity gases can be eliminated.

[0015] Furthermore, the pre-treatment device is not limited to a single one. Here, we propose an optimization and feasible option: the pre-treatment device also includes a water scrubbing tank. After the mixed gas enters the water scrubbing tank, some water-soluble gases are absorbed and dissolved. In this solution, the water scrubbing tank is used to further remove any soluble substances that have not been completely removed from the mixed gas.

[0016] Furthermore, the primary filter device purifies the mixed gas, mainly removing moisture, particles and some impurity gases therein by adsorption removal. The primary filter device can be constructed in various forms, which are not limited to a single form. Here, an optimization is made and one of the feasible options is proposed: the primary filter device includes a primary treatment tank, and two primary filter components are provided in the primary treatment tank. The primary filter components include an activated carbon adsorption component and a molecular sieve component connected in sequence from bottom to top; the two primary filter components are arranged in parallel and are connected to the pre-treatment device through control valves. When the above scheme is adopted, one of the two primary filter components can be connected to the treatment system, and the other can be used as a backup or maintenance path. When the amount of gas to be treated is too large, the two primary filter components can be opened at the same time; under this idea, multiple primary filter components can also be set.

[0017] Furthermore, when the primary treatment tank is processing gas, the gas can be controlled and transported according to the processing capacity of the subsequent device, so that the subsequent device can provide sufficient processing capacity. This can be achieved through a variety of schemes, which are not limited to the only one. Here, we optimize and propose one of the feasible options: the primary treatment tank is also provided with a gas circulation component, which includes a first buffer gas tank provided at the bottom of the primary treatment tank and a second buffer gas tank provided at the top of the primary treatment tank. The first buffer gas tank is connected to the pre-treatment device and is respectively connected to the air inlet end of the two-way primary filter assembly. The second buffer gas tank is connected to the air outlet end of the two-way primary filter assembly, and the second buffer gas tank is connected to the first buffer gas tank through the first outlet and is connected to the biological purification device through the second outlet. When the above scheme is adopted, the first buffer gas tank and the second buffer gas tank are provided with pressure sensors for real-time monitoring of the internal gas pressure value; the gas in the second buffer gas tank can be transported to the first buffer gas tank through the first outlet, and then purified again by the primary filter assembly.

[0018] Furthermore, the configuration of the primary filter assembly can affect the gas purification effect. While various configuration options are possible, one feasible option is optimized here: the activated carbon adsorption assembly and / or molecular sieve assembly each include a fluidized bed adsorber equipped with adsorption particles; and a weight sensor is provided in the fluidized bed adsorber to monitor changes in the weight of the adsorption particles. Using this configuration, the fluidized bed adsorber increases the contact area between the gas and the particles, thereby improving the treatment effect.

[0019] Furthermore, the biological purification device can be constructed in a variety of forms. Here, we optimize and propose one feasible option: the biological purification device includes a biological purification tank, wherein the microbial purification dishes are arranged in multiple layers from top to bottom. The upper end of the biological purification tank is an air inlet connected to the primary filtration device, and the lower end of the biological purification tank is an air outlet connected to the membrane separation device. When adopting this solution, a mounting rack can be installed in the biological purification tank, and the microbial purification dishes can be fixed to the mounting rack. When the gas passes through the microbial purification dishes from top to bottom, it is purified by the microorganisms.

[0020] Furthermore, when culturing microorganisms in a bio-purification dish, the specific culture environment affects their growth. To maintain an optimal environment for microbial growth, an optimization is proposed herein, including a feasible option: the bio-purification dish is provided with a matrix material comprising quartz sand and / or sawdust, the bottom of the bio-purification dish is provided with air vents for gas to pass through, and a weight sensor is also provided below the bio-purification dish to monitor changes in the bio-purification dish's weight. When this solution is adopted, a temperature maintenance device can be installed within the bio-purification tank. The temperature maintenance device includes a coil surrounding the inner wall of the bio-purification tank. The coil is connected to an external water supply, which provides circulating water at a constant temperature. The circulating water enters the coil and undergoes heat exchange within the bio-purification tank, thereby maintaining the temperature within the bio-purification tank.

[0021] Furthermore, the separation chamber of the membrane separation device is used for the final separation of gases. Its structure is not strictly limited. Here, we propose an optimized and feasible option: the separation chamber of the membrane separation device includes a first chamber for containing the mixed gas and a second chamber for containing CH4. Pressure sensors are installed in both the first and second chambers, and pressure relief lines are also provided in both the first and second chambers. When adopting this solution, a separation wall is provided between the first and second chambers, and a support frame is provided for mounting the separation membrane.

[0022] Furthermore, the operation of the entire system is subject to unified control, which is specifically implemented by a control device. Here, optimization is performed and one of the feasible options is proposed: the system also includes a control device, which cooperates with the intake pipe, purification device, storage device and recycling device respectively to control their operation.

[0023] Compared with the prior art, some of the beneficial effects of the technical solution disclosed in this utility model include:

[0024] The mixed gas is purified by the purification device, and the original acidic and alkaline gases and other impurities are removed, and combustible gas containing CH4 is obtained and recycled. By storing the recycled gas, it can be burned to generate electricity or provide heat when needed, which greatly improves the reuse rate of waste gas and avoids pollution and harm to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only represent some embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0027] Figure 2 Schematic diagram of the internal structure of the primary filter device.

[0028] Figure 3 Schematic diagram of the internal structure of the biological purification device.

[0029] Figure 4 Schematic diagram of the internal structure of the membrane separation device.

[0030] In the above drawings, the meanings of the symbols are as follows:

[0031] 1. Air intake pipe; 2. Acid tank; 3. Alkali tank; 4. Water washing tank; 5. Primary filtration device; 501. Second buffer gas tank; 502. Molecular sieve assembly; 503. Activated carbon adsorption assembly; 504. First buffer gas tank; 6. Biological purification device; 601. Mounting frame; 602. Microbial purification dish; 603. Coil; 7. Membrane separation device; 701. Separation wall; 702. Separation membrane; 703. First cavity; 704. Second cavity; 705. Pressure relief pipe; 8. Storage tank; 9. Thermal generator; 10. Boiler system. DETAILED DESCRIPTION

[0032] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0033] In view of the fact that the existing CH4-containing gas is not well utilized, resulting in waste of resources and environmental pollution, the following embodiments are optimized and overcome the defects in the existing technology.

[0034] Example

[0035] like Figures 1 to 4As shown, this embodiment provides a multi-stage impurity gas treatment and recovery system containing methane mixed gas, which is intended to purify and separate the mixed gas containing CH4 and reuse the useful gas therein, specifically including:

[0036] Inlet pipe 1, used to collect the mixed gas and transport it to the purification device;

[0037] The purification device includes a pre-treatment device, a primary filtration device 5, a biological purification device 6, and a membrane separation device 7, which are connected in sequence. The biological purification device 6 includes a microbial purification dish 602 for consuming and treating H2S and a microbial purification dish 602 for consuming and treating NH3. The membrane separation device 7 includes a separation chamber, in which a separation membrane 702 is provided that allows CH4 to pass through. The separation membrane 702 divides the separation chamber into two independent chambers. After passing through the separation membrane 702, CH4 enters one of the independent chambers and is controlled and transported to a storage device.

[0038] A storage device, comprising a plurality of storage tanks 8 for storing CH4;

[0039] The recycling device is connected to the storage device and obtains CH4 from the storage device for combustion to generate electricity or combustion to provide heat.

[0040] The recycling and utilization system disclosed in this embodiment transports the mixed gas generated after the solid waste treatment of the mobile phone through the air intake pipe 1 to the subsequent purification device for purification and removal of some toxic and harmful substances therein, and continues to transport the useful gas containing CH4 backward for storage and reuse, thereby facilitating the recycling of resources and reducing pollution to the environment.

[0041] The air inlet pipeline 1 may include a trumpet-shaped air collecting port, in which a negative pressure blower is provided for absorbing the exhaust gas. The air collecting port is connected to the air delivery path and delivers the gas to the purification device.

[0042] The recycling device may use a thermal generator 9 to generate electricity by burning heat, or may use a boiler system 10 to provide heat by burning the recovered useful gas containing CH4.

[0043] The pre-treatment device is used to pre-treat the mixed gas, the main purpose of which is to remove some of the harmful gases and reduce impurities such as particulate matter in the mixed gas. It can adopt a variety of structures, and the specific structure is not limited to the only one. This embodiment optimizes and adopts one of the feasible options: Figure 1As shown, the pre-treatment device includes an acid tank 2 and an alkali tank 3. The pre-treatment device is used to sequentially pass the mixed gas into the acid tank 2 and the alkali tank 3 to initially neutralize and absorb the alkaline and acidic gases in the mixed gas. When using this solution, the acid tank 2 and the alkali tank 3 can store liquid substances, and the mixed gas is passed into the liquid substances to be acid-washed or alkali-washed, thereby removing some of the substances therein. Alternatively, solid substances with corresponding pH values ​​can be placed in the acid tank 2 and the alkali tank 3. When the mixed gas passes through the gaps between the solid substances, it can eliminate some of the impurity gases.

[0044] The pre-treatment device is not limited to a single one. This embodiment optimizes and adopts one feasible option: the pre-treatment device also includes a water washing tank 4. After the mixed gas enters the water washing tank 4, some water-soluble gases are absorbed and dissolved. In this embodiment, the water washing tank 4 is used to further remove soluble substances in the mixed gas that have not been completely removed.

[0045] The primary filter device 5 purifies the mixed gas, mainly removing moisture, particles and some impurities therein by adsorption removal. The primary filter device 5 can be constructed in various forms, which are not limited to the only one. This embodiment optimizes and adopts one of the feasible options: Figure 2 As shown, the primary filtration device 5 includes a primary treatment tank, which contains two primary filtration assemblies. The primary filtration assemblies include an activated carbon adsorption assembly 503 and a molecular sieve assembly 502, which are connected in sequence from bottom to top. The two primary filtration assemblies are arranged in parallel and connected to the pre-treatment device via control valves. When adopting this solution, one of the two primary filtration assemblies can be connected to the treatment system, while the other can be used as a backup or maintenance line. When the amount of gas to be treated is too large, both primary filtration assemblies can be activated simultaneously. Based on this concept, multiple primary filtration assemblies can also be installed.

[0046] When the primary treatment tank is processing gas, the gas can be controlled and delivered according to the processing capacity of the subsequent device, so that the subsequent device can provide sufficient processing capacity. This can be achieved through a variety of solutions, which are not limited to the only one. This embodiment is optimized and adopts one of the feasible options: Figure 2As shown, the primary treatment tank is also provided with a gas circulation assembly, comprising a first buffer gas tank 504 disposed at the bottom of the primary treatment tank and a second buffer gas tank 501 disposed at the top of the primary treatment tank. The first buffer gas tank 504 is connected to the pre-treatment device and is respectively connected to the air inlet of the two primary filter assemblies. The second buffer gas tank 501 is connected to the air outlet of the two primary filter assemblies. The second buffer gas tank 501 is connected to the first buffer gas tank 504 via a first outlet and to the biological purification device 6 via a second outlet. When adopting the above solution, the first buffer gas tank 504 and the second buffer gas tank 501 are provided with pressure sensors for real-time monitoring of the internal gas pressure. The gas in the second buffer gas tank 501 can be transported to the first buffer gas tank 504 via the first outlet, and then subjected to further purification treatment by the primary filter assembly.

[0047] The configuration of the primary filtration assembly can affect the gas purification effect. Various configuration options are possible, but this embodiment optimizes and employs one feasible option: the activated carbon adsorption assembly 503 and / or the molecular sieve assembly 502 each include a fluidized bed adsorber equipped with adsorption particles; and a weight sensor is provided on the fluidized bed adsorber to monitor changes in the adsorption particle weight. Using this configuration, the fluidized bed adsorber increases the contact area between the gas and the particles, thereby improving the treatment effect.

[0048] The biological purification device 6 can be constructed in various forms. This embodiment optimizes and adopts one of the feasible options: Figure 3 As shown, the biological purification device 6 includes a biological purification tank, within which microbial purification dishes 602 are arranged in multiple layers from top to bottom. The upper end of the biological purification tank serves as an air inlet connected to the primary filtration device 5, while the lower end of the biological purification tank serves as an air outlet connected to the membrane separation device 7. When this solution is employed, a mounting frame 601 can be provided within the biological purification tank, to which the microbial purification dishes 602 are secured. As gas passes from top to bottom through the microbial purification dishes 602, it is purified by the microorganisms.

[0049] Preferably, in this embodiment, the mounting frame 601 adopts a cylindrical structure, and a channel for gas to pass through is formed inside, and the microbial purification dish 602 is arranged in the channel.

[0050] When culturing microorganisms in a bio-purification dish, the specific culture environment affects their growth. To maintain an optimal environment for microbial growth, this embodiment optimizes and adopts one feasible option: the bio-purification dish is provided with a matrix material comprising quartz sand and / or sawdust. The bottom of the bio-purification dish is provided with air vents for gas to pass through. A weight sensor is also positioned below the bio-purification dish to monitor changes in the bio-purification dish's weight. When this solution is adopted, a temperature maintenance device can be installed within the bio-purification tank. The temperature maintenance device includes a coil 603 surrounding the inner wall of the bio-purification tank. Coil 603 is connected to an external water supply, which provides circulating water at a constant temperature. The circulating water enters coil 603 and undergoes heat exchange within the bio-purification tank, thereby maintaining the temperature within the bio-purification tank.

[0051] The separation chamber of the membrane separation device 7 is used for the final separation of the gas. Its structure is not limited to a single one. This embodiment is optimized and adopts one of the feasible options: Figure 4 As shown, the separation chamber of the membrane separation device 7 includes a first chamber 703 for containing a mixed gas and a second chamber 704 for containing CH4. Pressure sensors are installed in both the first chamber 703 and the second chamber 704, and pressure relief pipes 705 are also installed in the first chamber 703 and the second chamber 704. When adopting the above solution, a separation wall 701 is provided between the first chamber 703 and the second chamber 704, and a support frame is provided for mounting the separation membrane 702.

[0052] The operation of the entire system is subject to unified control, which is specifically implemented by a control device. This embodiment is optimized and adopts one of the feasible options: the system also includes a control device, which cooperates with the intake pipe 1, the purification device, the storage device and the recycling device to control their operation.

[0053] The above are the implementation methods listed in this embodiment, but this embodiment is not limited to the above optional implementation methods. Those skilled in the art can arbitrarily combine the above methods to obtain other various implementation methods. Anyone can derive other various implementation methods based on the inspiration of this embodiment. The above specific implementation methods should not be understood as limiting the scope of protection of this embodiment. The scope of protection of this embodiment should be based on the definition in the claims.

Claims

1. A multi-stage impurity gas treatment and recovery system for methane-containing mixed gas, characterized in that: include: An air intake pipe (1) for collecting the mixed gas and conveying it to a purification device; A purification device comprises a pre-treatment device, a primary filtration device (5), a biological purification device (6) and a membrane separation device (7) which are connected in sequence; the biological purification device (6) comprises a microbial purification dish (602) for consuming and treating H2S and a microbial purification dish (602) for consuming and treating NH3; the membrane separation device (7) comprises a separation chamber, a separation membrane (702) which allows CH4 to pass through is arranged in the separation chamber, and the separation membrane (702) divides the separation chamber into two independent chambers, and CH4 enters one of the independent chambers after passing through the separation membrane (702) and is controlled to be transported to a storage device; A storage device, comprising a plurality of storage tanks (8) for storing CH4; The recycling device is connected to the storage device and obtains CH4 from the storage device for combustion to generate electricity or combustion to provide heat.

2. The multi-stage impurity gas treatment and recovery system for methane-containing mixed gas according to claim 1, characterized in that: The pre-treatment device comprises an acid tank (2) and an alkali tank (3), and is used for sequentially passing the mixed gas into the acid tank (2) and the alkali tank (3) to preliminarily neutralize and absorb the alkaline gas and acidic gas in the mixed gas.

3. The multi-stage impurity gas treatment and recovery system for methane-containing mixed gas according to claim 2, characterized in that: The pre-treatment device further comprises a water washing tank (4). After the mixed gas enters the water washing tank (4), part of the gas soluble in water is absorbed and dissolved.

4. The multi-stage impurity gas treatment and recovery system for methane-containing mixed gas according to claim 1, characterized in that: The primary filter device (5) includes a primary treatment tank, in which two primary filter components are arranged. The primary filter components include an activated carbon adsorption component (503) and a molecular sieve component (502) connected in sequence from bottom to top; the two primary filter components are arranged in parallel and are connected to the pre-treatment device through control valves respectively.

5. The multi-stage impurity gas treatment and recovery system for methane-containing mixed gas according to claim 4, characterized in that: A gas circulation component is also provided in the primary treatment tank, and the gas circulation component includes a first buffer gas tank (504) provided at the bottom of the primary treatment tank and a second buffer gas tank (501) provided at the top of the primary treatment tank. The first buffer gas tank (504) is connected to the pre-treatment device and is respectively connected to the air inlet ends of the two-way primary filter components. The second buffer gas tank (501) is connected to the air outlet ends of the two-way primary filter components, and the second buffer gas tank (501) is connected to the first buffer gas tank (504) through the first outlet and is connected to the biological purification device (6) through the second outlet.

6. The multi-stage impurity gas treatment and recovery system for methane-containing mixed gas according to claim 4 or 5, characterized in that: The activated carbon adsorption component (503) and / or the molecular sieve component (502) both include a fluidized bed adsorber, on which adsorption particles are arranged; and a weight sensor is arranged at the fluidized bed adsorber to monitor the weight change of the adsorption particles.

7. The multi-stage impurity gas treatment and recovery system for methane-containing mixed gas according to claim 1, 4 or 5, characterized in that: The biological purification device (6) includes a biological purification tank, in which the microbial purification dishes (602) are arranged in multiple layers from top to bottom, and the upper end of the biological purification tank is an air inlet and is connected to the primary filter device (5), and the lower end of the biological purification tank is an air outlet and is connected to the membrane separation device (7).

8. The multi-stage impurity gas treatment and recovery system for methane-containing mixed gas according to claim 7, characterized in that: The biological purification dish is provided with a matrix material including quartz sand and / or sawdust. The bottom of the biological purification dish is provided with air holes for passing gas. A weight sensor is also provided below the biological purification dish to monitor the weight change of the biological purification dish.

9. The multi-stage impurity gas treatment and recovery system for methane-containing mixed gas according to claim 7, characterized in that: The separation chamber of the membrane separation device (7) comprises a first chamber (703) for accommodating a mixed gas, and a second chamber (704) for accommodating CH4. Pressure sensors are provided in both the first chamber (703) and the second chamber (704), and pressure relief pipes (705) are also provided in the first chamber (703) and the second chamber (704).

10. The multi-stage impurity gas treatment and recovery system for methane-containing mixed gas according to claim 1, characterized in that: It also includes a control device, which cooperates with the air intake pipeline (1), the purification device, the storage device and the recycling device respectively and is used to control the operation thereof.

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