Biogas purification and impurity removal system

Abstract

The utility model relates to the technical field of biogas purification, and provides a biogas purification and impurity removal system which comprises a biological desulfurization module, a filtering module and a post-treatment module which are connected in sequence, the filtering module comprises multiple stages of filters which are sequentially arranged, the filtering precision of the multiple stages of filters is improved stage by stage, the first-stage filter is connected with the biological desulfurization module, and the last-stage filter is connected with the post-treatment module. Through the arrangement, complicated and changeable impurity components in the biogas can be better treated, large-particle impurities in the biogas can be effectively removed, and the content of small-particle impurities in the biogas can be effectively reduced, so that the influence of particles on the operation stability and the operation efficiency of subsequent equipment is reduced, and the economical efficiency and the stability of system operation are ensured.

Description

Technical Field

[0001] This utility model relates to the technical field of biogas purification, and in particular to a biogas purification and impurity removal system. Background Technology

[0002] With increasing global demand for renewable energy and growing environmental awareness, biogas, as a clean and sustainable energy source, is receiving increasing attention. However, raw biogas produced from biomass fermentation typically contains various impurities, such as hydrogen sulfide, carbon dioxide, moisture, and other trace gases. These components limit the effective utilization of biogas and can cause corrosion or blockage of equipment. Therefore, developing efficient biogas purification and impurity removal technologies is crucial for realizing the large-scale application of biogas.

[0003] In related technologies, biogas purification and impurity removal processes typically include the following core processing steps: biological desulfurization, coarse filtration, cooling and dehumidification, chemical desulfurization, dehydration, pressurization and transportation, and fine filtration before being delivered to subsequent gas-consuming units. Biogas undergoes initial desulfurization to remove sulfides. Subsequently, the gas passes through coarse filtration and then undergoes dehumidification, desulfurization, and water removal. The treated gas then undergoes fine filtration to meet gas consumption standards.

[0004] However, in practical applications, it has been found that tiny particulate matter may still be present in the gas after coarse filtration. Although these particulate matter can be removed by final fine filtration to ensure that the gas cleanliness meets the final usage requirements, these particulate matter may affect the stability and efficiency of subsequent equipment operation during the treatment process, resulting in a reduction in the economy and stability of the entire system operation.

[0005] Therefore, ensuring the economic efficiency and stability of biogas purification and impurity removal systems is an important issue that urgently needs to be addressed. Utility Model Content

[0006] This invention provides a biogas purification and impurity removal system to address the shortcomings of existing technologies where particulate matter affects the economic efficiency and stability of system operation. It can effectively reduce the content of small particulate impurities in biogas, thereby reducing the impact of particulate matter on the operational stability and efficiency of subsequent equipment, and ensuring the economic efficiency and stability of system operation.

[0007] This utility model provides a biogas purification and impurity removal system, comprising: a biological desulfurization module, a filtration module, and a post-treatment module connected in sequence;

[0008] The filtration module includes a multi-stage filter arranged sequentially with progressively increasing filtration accuracy. The first-stage filter is connected to the biological desulfurization module, and the final-stage filter is connected to the post-treatment module.

[0009] According to the biogas purification and impurity removal system provided by this utility model, the filtration module further includes a carbon bed filter, which is connected between the final filter and the post-treatment module.

[0010] According to the biogas purification and impurity removal system provided by this utility model, the filtration accuracy of the primary filter is less than or equal to 30 μm.

[0011] According to the biogas purification and impurity removal system provided by this utility model, the filtration accuracy of the final stage filter is less than or equal to 0.5 μm.

[0012] According to the biogas purification and impurity removal system provided by this utility model, the filtration module further includes a secondary filter and a tertiary filter disposed between the primary filter and the final filter.

[0013] According to the biogas purification and impurity removal system provided by this utility model, the filtration accuracy of the secondary filter is less than or equal to 10 μm, and the filtration accuracy of the tertiary filter is less than or equal to 1 μm.

[0014] According to the biogas purification and impurity removal system provided by this utility model, the filter element of the primary filter is made of impact-resistant filter material.

[0015] According to the present invention, a biogas purification and impurity removal system is provided, wherein the post-treatment module includes a cooling and dehumidification unit, a chemical desulfurization unit, and a dehydration unit connected in sequence; the cooling and dehumidification unit is connected to the filtration module.

[0016] According to the biogas purification and impurity removal system provided by this utility model, the post-processing module further includes a pressurization and conveying unit, which is connected to the dehydration unit and is used to pressurize and convey the gas.

[0017] According to the present invention, a biogas purification and impurity removal system is provided, wherein the pressurization and conveying unit includes at least two pressurization blowers connected to the dehydration unit, and the different pressurization blowers serve as backups for each other.

[0018] According to the present invention, a biogas purification and impurity removal system is provided, wherein the biological desulfurization module includes a biological desulfurization tower.

[0019] The biogas purification and impurity removal system provided by this utility model initially removes sulfides from biogas through a biological desulfurization module, then enters a filtration module. A multi-stage filter with progressively increasing filtration precision filters the biogas step by step. The filtered biogas then enters a post-treatment module for dehumidification, desulfurization, and water removal. By setting up a multi-stage filter between the biological desulfurization module and the post-treatment module, the system can better handle the complex and varied impurities in biogas. It effectively removes not only larger particulate impurities but also reduces the content of small particulate impurities, thereby minimizing the impact of particulate matter on the operational stability and efficiency of subsequent equipment, ensuring the system's economic efficiency and stability. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the biogas purification and impurity removal system provided in this embodiment of the utility model.

[0022] Figure label:

[0023] 10. Biological desulfurization module; 20. Filtration module; 21. Primary filter; 22. Secondary filter; 23. Tertiary filter; 24. Final filter; 25. Carbon bed filter; 30. Post-treatment module; 31. Cooling and dehumidification unit; 32. Chemical desulfurization unit; 33. Dehydration unit; 34. Pressurized conveying unit; 340. Booster fan. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] To better understand the biogas purification and impurity removal system provided by this utility model, its application background is introduced first. As a clean and sustainable energy form, the development of efficient biogas purification and impurity removal technologies has become the key to realizing the large-scale application of biogas.

[0026] Traditional biogas purification and impurity removal processes typically include the following core processing steps: biological desulfurization, coarse filtration, cooling and dehumidification, chemical desulfurization, dehydration, pressurization and transportation, and fine filtration to subsequent gas-using units.

[0027] However, in practical applications, it has been found that tiny particulate matter may still be present in the gas after coarse filtration. Although these particulate matter can be removed by final fine filtration to ensure that the gas cleanliness meets the final usage requirements, these particulate matter may affect the stability and efficiency of subsequent equipment operation during the treatment process, resulting in a reduction in the economy and stability of the entire system operation.

[0028] To address the aforementioned problems and findings, this invention provides a biogas purification and impurity removal system that can effectively reduce the impact of particulate matter on equipment operation and ensure the economic efficiency and stability of the system operation.

[0029] The following is combined Figure 1 This invention describes a biogas purification and impurity removal system.

[0030] Reference Figure 1 A biogas purification and impurity removal system includes a biological desulfurization module 10, a filtration module 20, and a post-treatment module 30. The biological desulfurization module 10 is suitable for initially removing sulfides from biogas using microbial decomposition. The filtration module 20 is suitable for filtering the gas and includes a multi-stage filter arranged sequentially with progressively increasing filtration precision. The first-stage filter 21 is connected to the biological desulfurization module 10, and the final-stage filter 24 is connected to the post-treatment module 30. The post-treatment module 30 is suitable for dehumidifying, desulfurizing, and removing water from the filtered gas.

[0031] In practical applications, biogas undergoes initial sulfide removal via the biological desulfurization module 10, followed by filtration module 20. A multi-stage filter with progressively increasing filtration precision filters the biogas step-by-step. The filtered biogas then enters the post-treatment module 30 for dehumidification, desulfurization, and water removal. By installing a multi-stage filter between the biological desulfurization module 10 and the post-treatment module 30, the complex and varied impurities in the biogas can be better addressed. This effectively removes not only larger particulate impurities but also reduces the content of smaller particulate impurities, thereby minimizing the impact of particulate matter on the stability and efficiency of subsequent equipment and ensuring the system's economic efficiency and stability.

[0032] In some optional embodiments, the number of filter stages in the filter module 20 and the filtration accuracy of each filter stage can be flexibly configured according to actual needs.

[0033] In one specific embodiment of this utility model, the filtration accuracy of the primary filter 21 is less than or equal to 30 μm, which is used to filter larger particulate impurities in biogas, preventing large particulate impurities from clogging subsequent filters with higher filtration accuracy, and helping to ensure the stability and reliability of the operation of the filter module 20.

[0034] In one specific embodiment of this utility model, the filtration accuracy of the final filter 24 is less than or equal to 0.5 μm, which is used to fully remove tiny particles in biogas, ensure that the cleanliness of biogas entering the post-treatment module 30 meets the requirements, and reduce the impact of particulate matter on the operational stability and efficiency of subsequent equipment.

[0035] In one specific embodiment of this utility model, the filtration module 20 further includes a secondary filter 22 and a tertiary filter 23 disposed between the primary filter 21 and the final filter 24; wherein the filtration accuracy of the secondary filter 22 is less than or equal to 10 μm, and the filtration accuracy of the tertiary filter 23 is less than or equal to 1 μm. By setting the secondary filter 22 and the tertiary filter 23, impurities of different particle sizes can be removed step by step, improving the overall purification efficiency and effect, extending the lifespan of each filter in the filtration module 20, and better adapting to the complex and varied impurity composition in biogas.

[0036] In one embodiment of this utility model, the filter element of the primary filter 21 is made of impact-resistant filter material, such as metal mesh filter material, glass fiber filter material, polyester fiber filter material, etc. The specific material can be selected according to actual needs, and no specific limitation is made in this embodiment. The impact-resistant filter material can withstand large particle impacts, extending the service life of the primary filter 21.

[0037] It should be noted that the specific structure of each stage of the filter in the filter module 20 can refer to the existing sieve-type gas dust filter, and will not be described in detail in this utility model.

[0038] In one embodiment of this invention, the filtration module 20 further includes a carbon bed filter 25, which is connected between the final filter 24 and the post-treatment module 30. It is understood that biogas contains not only particulate impurities but may also contain gaseous impurities such as siloxanes and volatile organic compounds (VOCs). These impurities can not only produce odors but also affect the performance and safety of subsequent gas-using units. The carbon bed filter 25 can effectively adsorb gaseous impurities in biogas, thereby further improving the gas purification effect and ensuring the safety and stability of subsequent gas-using units.

[0039] It should be noted that the working principle of the carbon bed filter 25 is based on the adsorption characteristics of activated carbon. Its specific structure can be referred to the existing technology, and will not be described in detail in this embodiment. In addition, the design parameters of the carbon bed filter 25, such as working pressure, temperature, and flow rate, can be adjusted according to specific application requirements, and will not be specifically limited in this embodiment.

[0040] In one embodiment of this utility model, the biological desulfurization module 10 includes a biological desulfurization tower. Specifically, the biological desulfurization tower is a device that uses microorganisms to degrade sulfur-containing compounds. It is mainly used to remove hydrogen sulfide (H2S) and other sulfur-containing compounds from biogas, thereby reducing the corrosiveness to subsequent equipment and reducing environmental pollution.

[0041] The specific structure of the biological desulfurization tower can be referred to the existing technology, and will not be described in detail in this embodiment. The design parameters of the biological desulfurization tower can be adjusted according to actual application requirements, and will not be specifically limited in this embodiment.

[0042] In one embodiment of the present invention, the post-processing module 30 includes a cooling and dehumidification unit 31, a chemical desulfurization unit 32, a dehydration unit 33 and a pressurization and conveying unit 34 connected in sequence, and the cooling and dehumidification unit 31 is connected to the carbon bed filter 25.

[0043] In one embodiment of this utility model, the cooling and dehumidification unit 31 includes a refrigerated dryer. The gas after multi-stage filtration and carbon bed filtration is transported to the refrigerated dryer. By lowering the gas temperature, the moisture in the gas can be condensed and removed, thus achieving preliminary dehumidification treatment.

[0044] In one embodiment of this invention, the chemical desulfurization unit 32 includes a chemical desulfurization tower. Biogas, after being refrigerated and dried by a cold dryer, enters the chemical desulfurization tower, where an alkaline absorbent further removes residual hydrogen sulfide (H2S) and other acidic gases. By combining biological and chemical desulfurization processes, sulfides (such as hydrogen sulfide) in the biogas are effectively removed, ensuring that the gas cleanliness meets the final usage requirements. This also reduces corrosion to equipment and minimizes environmental pollution.

[0045] In one embodiment of this utility model, the dehydration unit 33 includes a dehydration tank. Its principle is mainly to further remove residual moisture in the gas through gravity separation or adsorption by adsorbents, so as to prevent moisture from corroding subsequent equipment and to ensure the safety and stability of subsequent gas use.

[0046] In one embodiment of this utility model, the pressurization and conveying unit 34 can be a pressurization blower 340. The biogas after being dehydrated by the dehydration unit 33 enters the pressurization blower 340 for pressurization, and then is conveyed to the downstream gas-using unit, such as a generator set or a gas boiler.

[0047] Specifically, there are two or more booster fans 340, with different booster fans 340 serving as backups for each other, to ensure the stable and reliable operation of the booster delivery unit 34.

[0048] It is understandable that placing the filter module 20 with multi-stage filters between the biological desulfurization module 10 and the post-treatment module 30 has at least the following advantages:

[0049] 1) It can reduce the impact of particulate impurities on the heat exchange efficiency of the refrigerated dryer, ensure the cooling and dehumidification effect of the refrigerated dryer, and at the same time avoid the problem of scale and blockage caused by the accumulation of particulate impurities on the heat exchange surface of the refrigerated dryer, thus extending the service life of the refrigerated dryer.

[0050] 2) Reduce the impact of residual particulate impurities on the absorption effect of alkaline absorbent in the chemical desulfurization tower, ensure the removal effect of acidic gas in the chemical desulfurization tower, and at the same time reduce the problems of internal blockage and corrosion of the equipment.

[0051] 3) By reducing particulate impurities in biogas, the operating load of each device in the post-treatment module 30 can be reduced, the overall operating efficiency of the system can be improved, and the wear and tear of each device can be reduced, thereby reducing the failure rate and maintenance frequency of the equipment and reducing the equipment maintenance cost.

[0052] 4) The carbon bed filter 25 can effectively adsorb gaseous impurities in biogas, reduce odor, and ensure the performance and safety of subsequent gas-using units.

[0053] It should be noted that the various devices in the post-processing module 30, such as the refrigerated dryer, chemical desulfurization tower, dehydration tank, and booster fan 340, can all be existing devices. The specific structure and working principle of each device can be referred to the existing technology, and will not be elaborated in this embodiment. The working parameters of each device can be selected according to actual needs, and no specific limitations are imposed in this embodiment.

[0054] The biogas purification and impurity removal system provided in this embodiment of the invention initially removes sulfides from biogas through a biological desulfurization module 10, and then enters a filtration module 20. A multi-stage filter with progressively increasing filtration precision filters the biogas step by step. The filtered biogas then enters a post-treatment module 30 for dehumidification, desulfurization, and water removal. By setting up a multi-stage filter between the biological desulfurization module 10 and the post-treatment module 30, the system can better handle the complex and varied impurities in biogas. It effectively removes not only larger particulate impurities but also reduces the content of small particulate impurities, thereby minimizing the impact of particulate matter on the operational stability and efficiency of subsequent equipment such as refrigerated dryers, dehydration tanks, chemical desulfurization towers, and booster fans 340, ensuring the system's economic efficiency and stability.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A biogas purification and impurity removal system, characterized in that, include: The biological desulfurization module (10), the filtration module (20), and the post-treatment module (30) are connected in sequence. The filtration module (20) includes a multi-stage filter arranged sequentially with progressively increasing filtration accuracy. The first-stage filter (21) is connected to the biological desulfurization module (10), and the final-stage filter (24) is connected to the post-treatment module (30).

2. The biogas purification and impurity removal system according to claim 1, characterized in that, The filtration module (20) further includes a carbon bed filter (25), which is connected between the final filter (24) and the post-treatment module (30).

3. The biogas purification and impurity removal system according to claim 1, characterized in that, The filtration accuracy of the primary filter (21) is less than or equal to 30 μm.

4. The biogas purification and impurity removal system according to claim 3, characterized in that, The filtration accuracy of the final filter (24) is less than or equal to 0.5 μm.

5. The biogas purification and impurity removal system according to claim 2, characterized in that, The filtration module (20) also includes a secondary filter (22) and a tertiary filter (23) disposed between the primary filter (21) and the final filter (24).

6. The biogas purification and impurity removal system according to claim 5, characterized in that, The filtration accuracy of the secondary filter (22) is less than or equal to 10 μm, and the filtration accuracy of the tertiary filter (23) is less than or equal to 1 μm.

7. The biogas purification and impurity removal system according to claim 1, characterized in that, The primary filter (21) uses an impact-resistant filter material for its filter element.

8. The biogas purification and impurity removal system according to any one of claims 1 to 7, characterized in that, The post-processing module (30) includes a cooling and dehumidification unit (31), a chemical desulfurization unit (32), and a dehydration unit (33) connected in sequence; the cooling and dehumidification unit (31) is connected to the filtration module (20).

9. The biogas purification and impurity removal system according to claim 8, characterized in that, The post-processing module (30) further includes a pressurization and conveying unit (34), which is connected to the dehydration unit (33) and is used to pressurize and convey the gas.

10. The biogas purification and impurity removal system according to claim 9, characterized in that, The pressurized conveying unit (34) includes at least two pressurized blowers (340) connected to the dewatering unit (33), and the different pressurized blowers (340) serve as backups for each other.

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