Integrated biological desulfurization system

Abstract

An integrated biological desulfurization system comprises a desulfurization tower and an external circulation pipeline of the desulfurization tower, the desulfurization tower is divided into a biological absorption section and a biological reaction section up and down, and a filler area is arranged in the biological absorption section and located between an air inlet and an air outlet of the desulfurization tower; the biological reaction section is divided into a sulfur reaction area and a sulfur precipitation area left and right, the sulfur precipitation area is provided with a precipitation device with an oblique flow precipitation function, and an oblique flow inlet and an oblique flow outlet of the precipitation device are both communicated with the sulfur reaction area; the external circulation pipeline is communicated with a sludge discharge port of the sulfur settling zone and a spraying port of the biological absorption section, so that liquid rich in microorganisms at the bottom of the desulfurization tower is circulated to the filler zone for desulfurization treatment of sulfur-containing gas. According to the desulfurization tower, sulfur reaction and sulfur precipitation related components are integrated into the desulfurization tower, the structure is compact, the occupied area is small, and efficient removal and recovery of sulfur elements in sulfur-containing gas can be achieved through efficient circulation of activated sludge.

Description

Technical Field

[0001] The utility model belongs to the technical field of biogas biological desulfurization, in particular to an integrated biological desulfurization system. Background Art

[0002] In the field of biogas treatment, especially in the anaerobic treatment of papermaking wastewater treatment systems, the biogas produced may contain highly toxic and corrosive hydrogen sulfide. In order to ensure equipment safety and environmental friendliness, the hydrogen sulfide contained in the biogas must be removed before it is used. The biological desulfurization process is specifically used to remove hydrogen sulfide from biogas. This process is a biogas purification technology that converts hydrogen sulfide in biogas into elemental sulfur through the biological action of sulfur bacteria, which can simultaneously achieve the purpose of removing hydrogen sulfide from biogas and recovering elemental sulfur. However, the traditional biological desulfurization device has a complex structure and occupies a large area, which is not conducive to daily operation. Utility Model Content

[0003] In view of the above technical problems, the purpose of the utility model is to provide an integrated biological desulfurization system, which integrates the sulfur reaction and sulfur precipitation related components into the desulfurization tower. It has a compact structure and occupies a small area, and can achieve efficient removal and recovery of sulfur elements in sulfur-containing gases through the efficient circulation of activated sludge.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] Integrated biological desulfurization system, including desulfurization tower and its external circulation pipeline,

[0006] The desulfurization tower is divided into a bioabsorption section and a bioreaction section from top to bottom, and a packing area is arranged between the air inlet and the air outlet of the desulfurization tower in the bioabsorption section; the bioreaction section is divided into a sulfur reaction area and a sulfur precipitation area from left to right, and a precipitation device with an oblique flow sedimentation function is arranged in the sulfur precipitation area, and the oblique flow inlet and the oblique flow outlet of the precipitation device are both connected to the sulfur reaction area;

[0007] The external circulation pipeline is connected to the sludge outlet of the sulfur precipitation zone and the spray outlet of the biological absorption section to circulate the liquid rich in microorganisms at the bottom of the desulfurization tower to the packing area for desulfurization treatment of sulfur-containing gas.

[0008] In some technical solutions, the sedimentation device is an inclined tube or an inclined plate or has a conical bottom surface; and / or,

[0009] The oblique flow inlet of the sedimentation device is flush with the liquid level of the sulfur reaction zone, and the oblique flow outlet of the sedimentation device is communicated with the bottom sludge of the sulfur reaction zone.

[0010] In some technical solutions, the mud discharge port of the sulfur precipitation zone is arranged at the oblique flow outlet of the precipitation device, the mud discharge port is connected to a mud discharge pipeline, and a mud discharge automatic control valve is arranged on the mud discharge pipeline.

[0011] In some technical solutions, the sulfur reaction zone is connected to an oxygen supply pipeline, and a blower and an aeration device are arranged in sequence along the gas transmission direction on the oxygen supply pipeline; an ORP meter is arranged on the external circulation pipeline;

[0012] The blower, aerator and ORP meter are combined to provide limited oxygen to the sulfur bacteria in the biological reaction section so that sulfide is converted into elemental sulfur.

[0013] In some technical solutions, the biological reaction section is provided with a heating device; a thermometer and a pH meter are arranged on the external circulation pipeline; the heating device, pH meter and thermometer are combined to ensure the environmental temperature and alkalinity required by the microorganisms in the biological reaction section.

[0014] In some technical solutions, the desulfurization tower is also provided with a water replenishment port, which is connected to the clean water supply pipeline; the biological reaction section is provided with a liquid level meter; the clean water supply pipeline ensures a constant volume of liquid in the biological reaction section through the combination of the water replenishment port and the liquid level meter.

[0015] In some technical solutions, the bioabsorption section is provided with an upper filler area and a lower filler area.

[0016] The upper filling area is provided with an upper spray layer, an upper water distribution tray and an upper filling layer in sequence from top to bottom; the lower filling area is provided with a lower spray layer, a lower water distribution tray and a lower filling layer in sequence from top to bottom;

[0017] The upper spray layer and the lower spray layer are connected to the mud discharge port of the sulfur precipitation area through an external circulation pipeline.

[0018] In some technical solutions, an upper spray automatic control valve is arranged on the connecting branch between the external circulation pipeline and the upper spray layer; a lower spray automatic control valve is arranged on the connecting branch between the external circulation pipeline and the lower spray layer.

[0019] In some technical solutions, the upper spray layer is provided with a plurality of upper rotary spray heads; and the lower spray layer is provided with a plurality of lower rotary spray heads.

[0020] In some technical solutions, a biological zone spray layer is provided above the sulfur reaction zone, the biological zone spray layer is connected to the mud discharge port of the sulfur precipitation zone through a circulation pump, and the biological zone spray layer is provided with a plurality of biological zone rotating spray heads.

[0021] The utility model adopts the above technical solution to have at least the following beneficial effects:

[0022] 1. The utility model provides an integrated biological desulfurization system, which integrates the components related to sulfur reaction and sulfur precipitation into the desulfurization tower, has a compact structure, occupies a small area, and can achieve efficient removal and recovery of sulfur elements in sulfur-containing gas through efficient circulation of activated sludge;

[0023] 2. The utility model provides an integrated biological desulfurization system, wherein the oblique inlet and oblique outlet of the sulfur precipitation zone are both connected to the sulfur reaction zone. With such a design, the liquid containing microorganisms at the upper part of the sulfur reaction zone flows into the sulfur precipitation zone by gravity, and is precipitated at the bottom of the sulfur precipitation zone by oblique flow to enrich the activated sludge. When the activated sludge is extracted, since the bottom sludge of the sulfur precipitation zone is connected with that of the sulfur reaction zone, a high-throughput sludge circulation can be achieved, thereby optimizing the desulfurization efficiency and desulfurization effect of the sulfur-containing gas.

[0024] 3. The utility model provides an integrated biological desulfurization system, in which relevant dissolved oxygen control components, temperature control components and alkalinity control components are respectively arranged in the biological reaction section, wherein the dissolved oxygen control component is used to provide a limited amount of oxygen to sulfur bacteria so that sulfide is converted into sulfur; the temperature control component is used to ensure the appropriate temperature required by the microorganisms in the biological reaction section; the alkalinity control component is used to ensure the appropriate alkalinity required by the microorganisms in the biological reaction section; through the above design, the sludge in the biological reaction section can be fully utilized and the sulfur element in the liquid can be efficiently removed;

[0025] 4. The utility model provides an integrated biological desulfurization system, which is designed with a liquid replenishment port and a liquid level meter, which are combined to ensure a constant volume of liquid in the biological reaction section, thereby maintaining long-term stable operation of the system;

[0026] 5. The utility model provides an integrated biological desulfurization system, in which an automatic control valve body is arranged on the external circulation pipeline and the connecting branch with each spray layer, so as to realize automatic control of the spray pipeline and the mud discharge pipeline;

[0027] 6. The utility model provides an integrated biological desulfurization system, which is respectively provided with an upper filling area and a lower filling area. The corresponding spray pipeline can be selected for treatment according to the sulfur content in the intake air, making the system more applicable and more maneuverable. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings and their marks required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1This is a schematic structural diagram of the integrated biological desulfurization system described in an embodiment of the utility model;

[0030] Figure 2 This is a structural diagram of the upper water distribution tray and the lower water distribution tray described in an embodiment of the utility model.

[0031] The meanings of the symbols in the figure are as follows:

[0032] 1—desulfurization tower, 2—air inlet, 3—air outlet, 4—liquid level meter, 5—clean water supply pipeline, 6—water replenishment port, 7—blower, 8—aeration device, 9—sedimentation device, 10—circulation pump, 11—sludge outlet, 12—pH meter, 13—thermometer, 14—ORP meter, 15—biological zone rotary spray head, 16—upper rotary spray head, 17—lower rotary spray head, 18—upper packing layer, 19—lower packing layer, 20—heating device, 21—biological reaction section, 22—upper spray automatic control valve, 23—lower spray automatic control valve, 24—sludge discharge automatic control valve, 25—upper water distribution tray, 26—lower water distribution tray, 27—water distribution hole. DETAILED DESCRIPTION

[0033] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0034] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0035] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0036] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0037] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0038] As a specific example, Figure 1 , showing an integrated biological desulfurization system, including a desulfurization tower 1 and its external circulation pipeline, the desulfurization tower 1 is divided into a biological absorption section and a biological reaction section 21 from top to bottom, a packing area is arranged between the air inlet 2 and the air outlet 3 of the desulfurization tower 1 in the biological absorption section; the biological reaction section 21 is divided into a sulfur reaction zone and a sulfur precipitation zone from left to right, a precipitation device 9 with an oblique flow sedimentation function is arranged in the sulfur precipitation zone, and the oblique flow inlet and the oblique flow outlet of the precipitation device 9 are both connected to the sulfur reaction zone; the external circulation pipeline connects the mud discharge port 11 of the sulfur precipitation zone and the spray port of the biological absorption section, so as to circulate the liquid rich in microorganisms at the bottom of the desulfurization tower to the packing area for desulfurization treatment of the sulfur-containing gas.

[0039] The present application integrates the components related to sulfur reaction and sulfur precipitation into the desulfurization tower, which has a compact structure and occupies a small area, and can achieve efficient removal and recovery of sulfur elements in sulfur-containing gases through efficient circulation of activated sludge.

[0040] The oblique flow inlet and the oblique flow outlet of the sulfur precipitation zone of the present application are both connected with the sulfur reaction zone. Such a design allows the liquid containing microorganisms at the top of the sulfur reaction zone to flow into the sulfur precipitation zone and enrich the activated sludge at the bottom of the sulfur precipitation zone through oblique flow precipitation. When the activated sludge is extracted, since the bottom sludge of the sulfur precipitation zone and the sulfur reaction zone is connected, high-throughput sludge circulation can be achieved, thereby optimizing the desulfurization efficiency and desulfurization effect of the sulfur-containing gas.

[0041] Specifically, the above-mentioned sedimentation device 9 can be an inclined tube or an inclined plate. In a preferred embodiment, it can also have a conical bottom surface. It should be noted that the specific structure of the sedimentation device 9 in the present application can have a variety of variations. The inclined surface in the above embodiment does not need to be completely flat and smooth. It only needs to show a downward trend in the overall structure or except Figure 1 In the case where the sulfur precipitation zone is located on the left side of the sulfur reaction zone, the overall structure will show an upward trend.

[0042] Preferably, the oblique inlet of the sedimentation device 9 is flush with the liquid level of the sulfur reaction zone, and the oblique outlet of the sedimentation device 9 is connected to the bottom sludge of the sulfur reaction zone. In this embodiment, the sedimentation device 9 can be arranged at the maximum vertical height of the sulfur sedimentation zone, so that the mud and water can be fully separated.

[0043] In the above embodiment, relevant dissolved oxygen control components, temperature control components and alkalinity control components are respectively provided in the biological reaction section 21, wherein the dissolved oxygen control component is used to provide a limited amount of oxygen to the sulfur bacteria so that the sulfide is converted into elemental sulfur; the temperature control component is used to ensure the appropriate temperature required by the microorganisms in the biological reaction section 21; the alkalinity control component is used to ensure the appropriate alkalinity required by the microorganisms in the biological reaction section; through the above design, the sludge in the biological reaction section 21 can be fully utilized and the efficient removal of sulfur in the liquid can be achieved.

[0044] Specifically, the dissolved oxygen control component includes a blower 7, an aeration device 8 and an ORP meter 14. The blower 7 and the aeration device 8 are connected through an oxygen supply pipeline connected to the lower part of the sulfur reaction zone. The aeration device 8 can be various airflow distribution structures, and it is only necessary to achieve uniform gas distribution on the transverse section of the sulfur reaction zone; the ORP meter 14 is arranged on the external circulation pipeline to monitor the redox degree of the circulating sludge.

[0045] Specifically, the temperature control component includes a heating device 20 and a thermometer 13, wherein the heating device 20 is a heating belt or a heating interlayer (with a refrigerant circulating inside) or a heating coil (which can be arranged inside or outside the tower) arranged on the side wall of the biological reaction section 21, and is used to provide the heating and insulation requirements of the sludge in the biological reaction section 21; the thermometer 13 is arranged on the external circulation pipeline to monitor the temperature of the circulating sludge.

[0046] Specifically, the alkalinity control component includes a pH meter 12, which is arranged on the external circulation pipeline to monitor the alkalinity of the circulating sludge.

[0047] In the above embodiment, the desulfurization tower 1 is also provided with a water replenishment port 6, which is connected to the clean water supply pipeline 5. A rotating spray head is arranged at the outlet of the clean water supply pipeline 5, which can be used to defog the exhaust gas; a liquid level meter 4 is arranged at the lower part of the biological reaction section 21; the clean water supply pipeline 5 ensures a constant volume of liquid in the biological reaction section 21 through the combination of the water replenishment port 6 and the liquid level meter 4.

[0048] Of course, the above embodiments may also include a controller, which includes a memory and a processor, the memory is used to store computer programs, and the processor is used to regulate the corresponding oxygen flow, temperature, alkalinity and liquid level according to the feedback data of the above-mentioned ORP meter 14, thermometer 13, pH meter 12 and liquid level meter 4.

[0049] In the above embodiment, the mud discharge port 11 of the sulfur precipitation zone is arranged at the oblique flow outlet of the precipitation device 9, and the mud discharge port 11 is connected to a mud discharge pipeline, and a mud discharge automatic control valve 24 is arranged on the mud discharge pipeline.

[0050] In the above embodiment, an upper filling area and a lower filling area are provided in the biological absorption section. The upper filling area is provided with an upper spray layer, an upper water distribution tray 25 and an upper filling layer 18 in sequence from top to bottom; the lower filling area is provided with a lower spray layer, a lower water distribution tray 26 and a lower filling layer 19 in sequence from top to bottom; the upper spray layer and the lower spray layer are connected to the mud discharge port 11 of the sulfur precipitation area through an external circulation pipeline.

[0051] Specifically, Figure 2 A plurality of water distribution holes 27 are evenly distributed on the upper water distribution tray 25 and the lower water distribution tray 26 .

[0052] In this embodiment, an upper filling area and a lower filling area are respectively provided, and a corresponding spray pipeline can be selected for treatment according to the sulfur content in the intake air, so that the system has richer applicable scenarios and more maneuverability.

[0053] Preferably, an upper spray automatic control valve 22 is arranged on the connecting branch between the external circulation pipeline and the upper spray layer; and a lower spray automatic control valve 23 is arranged on the connecting branch between the external circulation pipeline and the lower spray layer.

[0054] In this embodiment, an automatic control valve body is arranged on the external circulation pipeline and the connecting branches between the external circulation pipeline and each spray layer, so as to realize automatic on-off control of the spray pipeline and the mud discharge pipeline.

[0055] Specifically, the upper spray layer is provided with a plurality of upper rotary spray heads 16, and the lower spray layer is provided with a plurality of lower rotary spray heads 17. The water of the bioreactor can be uniformly sprayed on the filler area.

[0056] In the above embodiment, a biological zone spray layer is provided above the sulfur reaction zone, the biological zone spray layer is connected to the mud discharge port 11 of the sulfur precipitation zone through a circulation pump 10, and the biological zone spray layer is provided with a plurality of biological zone rotating spray heads 15.

[0057] In order to have a clearer understanding of the technical solution and technical effects of this application, the specific reaction principle is provided as follows:

[0058] Biogas enters the desulfurization tower 1 through the air inlet 2, and fully contacts the upper and lower fillers attached with sulfur bacteria during the rising process. The upper rotary spray head 16 and the lower rotary spray head 17 rotate evenly, so that the liquid contacts the microorganisms on the filler more evenly. The purified biogas enters the subsequent biogas utilization unit through the air outlet 3; the upper rotary spray head 16 and the lower rotary spray head 17 spray the water of the biological reaction section 21 evenly on the filler area, and the microorganisms that absorb hydrogen sulfide gas fall into the biological reaction section 21. The blower 7, the aeration device 8 and the ORP meter 14 provide limited oxygen to the sulfur bacteria to convert sulfide into sulfur. The liquid containing sulfur is discharged from the biological desulfurization system through the mud outlet 11 for subsequent treatment; the liquid rich in nutrient solution in the biological reaction section 21 is transported to the upper filler, the lower filler and the sulfur reaction area through the circulation pump 10, so as to achieve the goals of liquid circulation, promoting reaction and eliminating foam. The heating device 20, the pH meter 12 and the thermometer 13 are combined to ensure the suitable temperature required by the microorganisms in the biological reaction section 21. The clean water supply pipeline 5 is combined with the water replenishment port 6 and the liquid level meter 4 to ensure a constant volume of liquid in the biological reaction section.

[0059] The circulation pump 10 extracts liquid rich in microorganisms from the biological reaction section 21. If the sulfide concentration in the biogas is high, the upper spray automatic control valve 22 is opened, and the biological liquid is sprayed into the upper water distribution tray 25 through the upper rotary spray head 16. The bottom surface of the upper water distribution tray 25 is provided with water distribution holes 27, and the biological liquid drips evenly into the upper filler through the water distribution holes 27. If the sulfide concentration in the biogas is low, the lower spray automatic control valve 23 is opened, and the biological liquid is sprayed into the lower water distribution tray 26 through the lower rotary spray head 17. The bottom surface of the lower water distribution tray 26 is provided with water distribution holes 27, and the biological liquid drips evenly into the lower filler through the water distribution holes 27. Sulfur can be discharged from the biological reaction zone through the mud discharge port 11 and the mud discharge automatic control valve 24.

[0060] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the attached claims.

Claims

1. Integrated biological desulfurization system, characterized in that: Including desulfurization tower and its external circulation pipeline, The desulfurization tower is divided into a bioabsorption section and a bioreaction section from top to bottom, and a packing area is arranged between the air inlet and the air outlet of the desulfurization tower in the bioabsorption section; the bioreaction section is divided into a sulfur reaction area and a sulfur precipitation area from left to right, and a precipitation device with an oblique flow sedimentation function is arranged in the sulfur precipitation area, and the oblique flow inlet and the oblique flow outlet of the precipitation device are both connected to the sulfur reaction area; The external circulation pipeline is connected to the sludge outlet of the sulfur precipitation zone and the spray outlet of the biological absorption section to circulate the liquid rich in microorganisms at the bottom of the desulfurization tower to the packing area for desulfurization treatment of sulfur-containing gas.

2. The integrated biological desulfurization system according to claim 1, characterized in that: The sedimentation device is an inclined tube or an inclined plate or has a conical bottom surface; and / or, The oblique flow inlet of the sedimentation device is flush with the liquid level of the sulfur reaction zone, and the oblique flow outlet of the sedimentation device is communicated with the bottom sludge of the sulfur reaction zone.

3. The integrated biological desulfurization system according to claim 1 or 2, characterized in that: The mud discharge port of the sulfur precipitation zone is arranged at the oblique flow outlet of the precipitation device, the mud discharge port is connected with a mud discharge pipeline, and a mud discharge automatic control valve is arranged on the mud discharge pipeline.

4. The integrated biological desulfurization system according to claim 1, characterized in that: The sulfur reaction zone is connected to an oxygen supply pipeline, on which a blower and an aeration device are arranged in sequence along the gas transport direction; an ORP meter is arranged on the external circulation pipeline; The blower, aerator and ORP meter are combined to provide limited oxygen to the sulfur bacteria in the biological reaction section so that sulfide is converted into elemental sulfur.

5. The integrated biological desulfurization system according to claim 1, characterized in that: The biological reaction section is provided with a heating device; the external circulation pipeline is arranged with a thermometer and a pH meter; the heating device, the pH meter and the thermometer are combined to ensure the environmental temperature and alkalinity required by the microorganisms in the biological reaction section.

6. The integrated biological desulfurization system according to claim 1, characterized in that: The desulfurization tower is also provided with a water replenishment port, which is connected to a clean water supply pipeline; the biological reaction section is provided with a liquid level meter; the clean water supply pipeline ensures a constant volume of liquid in the biological reaction section through the combination of the water replenishment port and the liquid level meter.

7. The integrated biological desulfurization system according to claim 1, characterized in that: The bioabsorption section is provided with an upper filler area and a lower filler area. The upper filling area is provided with an upper spray layer, an upper water distribution tray and an upper filling layer in sequence from top to bottom; the lower filling area is provided with a lower spray layer, a lower water distribution tray and a lower filling layer in sequence from top to bottom; The upper spray layer and the lower spray layer are connected to the mud discharge port of the sulfur precipitation area through an external circulation pipeline.

8. The integrated biological desulfurization system according to claim 7, characterized in that: An upper spray automatic control valve is arranged on the connecting branch between the external circulation pipeline and the upper spray layer; a lower spray automatic control valve is arranged on the connecting branch between the external circulation pipeline and the lower spray layer.

9. The integrated biological desulfurization system according to claim 7 or 8, characterized in that: The upper spray layer is provided with a plurality of upper rotary spray heads; the lower spray layer is provided with a plurality of lower rotary spray heads.

10. The integrated biological desulfurization system according to claim 1, characterized in that: A biological zone spray layer is arranged above the sulfur reaction zone, the biological zone spray layer is connected with the mud discharge port of the sulfur precipitation zone through a circulation pump, and the biological zone spray layer is provided with a plurality of biological zone rotating spray heads.

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