CN217323989U

CN217323989U - Integrated pure oxygen biological desulfurization reaction device

Info

Publication number: CN217323989U
Application number: CN202220619279.1U
Authority: CN
Inventors: 姚建刚; 田启欢; 宫亚斌; 詹偶如; 包海军; 宋波
Original assignee: Hangzhou Energy & Environmental Engineering Co ltd
Current assignee: Hangzhou Energy & Environmental Engineering Co ltd
Priority date: 2022-03-21
Filing date: 2022-03-21
Publication date: 2022-08-30
Anticipated expiration: 2032-03-21

Abstract

The scheme discloses an integrated pure oxygen biological desulfurization reaction device, which comprises a biological desulfurization tower, a liquid preparation tank, oxygen supply equipment and a gas mixer; the gas mixer is provided with at least 2 inlets, wherein one inlet is used for connecting the biogas to be treated; the downstream end of the oxygen supply equipment is connected with the other inlet of the gas mixer; the downstream end of the gas mixer is connected with a biological desulfurization tower; the liquid preparation tank is a sealing structure and is communicated with the biological desulfurization tower. The beneficial effect of this scheme is: air is not used as an oxygen supply source, so that adverse effects caused by nitrogen contained in the air are eliminated, and a liquid preparation tank is not required to be opened to the atmosphere, so that peculiar smell pollution is eliminated.

Description

Integrated pure oxygen biological desulfurization reaction device

Technical Field

The utility model relates to a marsh gas aftertreatment device field specifically is an integral type pure oxygen biological desulfurization reaction unit.

Background

Biogas is an important component of biomass energy, and is typical green energy and clean energy. The utilization of the biogas usually needs to be subjected to desulfurization and purification treatment, wherein the more common desulfurization and purification processes are a wet desulfurization process, an acidic biological desulfurization process and a dry desulfurization process. The wet desulphurization process is to absorb hydrogen sulfide in the methane by using alkali liquor, and the alkali liquor after absorbing the hydrogen sulfide reacts with oxygen under the participation of proper temperature, pH value and catalyst to obtain regeneration; the acidic biological desulfurization process is characterized in that under the conditions of proper pH, temperature, nutrient substances and the like, hydrogen sulfide is converted into elemental sulfur and sulfuric acid under the participation of oxygen through the action of microorganisms; the dry desulfurization process is to utilize substances such as ferric oxide and active carbon to carry out physical and chemical absorption and adsorption on hydrogen sulfide. Wherein, the wet desulphurization needs to add alkali liquor additionally to maintain the pH value of the desulphurization system, so the operation cost is higher and the influence on the environment is larger; and the acidic biological desulfurization does not need to add extra alkali liquor, so the operation cost is low, and the environment is friendly.

The traditional acid biological desulfurization process is generally composed of a desulfurization tower and an external aeration water tank (also called a liquid distribution tank). The oxygen in the biological desulfurization process is derived from air. In the desulfurization process, air is required to be introduced into the biological desulfurization tower and the aeration water tank to supplement oxygen required by the biological desulfurization microbial reaction process. For example, chinese patent document CN101053765A discloses a "biogas biological desulfurization apparatus" in 10/17/2007, which is a desulfurization tower with a biogas inlet and a biogas outlet, wherein a plurality of fillers are placed in the desulfurization tower, a nozzle is disposed above the fillers, the nozzle is communicated with a delivery pipe with a reflux pump, and another pipe orifice of the delivery pipe is located in a nutrient solution section at the lower part of the desulfurization tower; the bottom of the tower is provided with a discharge outlet. The following two main disadvantages exist in the conventional acid biological desulfurization process:

1. the main components of the air comprise 21 percent of oxygen and 78 percent of nitrogen, the biological desulfurization system can only utilize the oxygen, and the rest large amount of nitrogen cannot be utilized by desulfurization organisms and is mixed with the biogas to form nitrogen-biogas mixed gas. Nitrogen in the mixed gas cannot be simply and thoroughly separated, so that the concentration of methane in the mixed gas is low, the heat value of the biogas at the unit volume of a biogas utilization end is influenced, and the reaction of biological desulfurization and the way of rear-end utilization of the biogas are influenced;

2. as mentioned above, the biological desulfurization system must have an external aeration water tank, and the aeration water tank must be communicated with the outside atmosphere to oxygenate the water tank, so that the nutrient solution keeps sufficient oxygen content, and the communication with the atmosphere inevitably leads to the escape of peculiar smell gas in the nutrient solution, thereby affecting the environment.

Disclosure of Invention

Based on above problem, the utility model provides an integral type pure oxygen biological desulfurization reaction unit does not use the air as the oxygen suppliment source, has consequently eliminated the adverse effect that nitrogen gas contained in the air brought, also no longer need open to the atmosphere and join in marriage the fluid reservoir, has eliminated the peculiar smell pollution.

In order to realize the purpose of the invention, the utility model adopts the following technical scheme: an integrated pure oxygen biological desulfurization reaction device comprises a biological desulfurization tower, a liquid preparation tank, oxygen supply equipment and a gas mixer;

the gas mixer is provided with at least 2 inlets, wherein one inlet is used for connecting the biogas to be treated;

the downstream end of the oxygen supply equipment is connected with the other inlet of the gas mixer;

the downstream end of the gas mixer is connected with a biological desulfurization tower;

the liquid preparation tank is a sealing structure and is communicated with the biological desulfurization tower.

Preferably, the device also comprises a condensation dehydration unit; the condensation dehydration unit is connected with the downstream of the biological desulfurization tower.

Preferably, a sulfur paste filter is also included; the sulfur paste filtering machine is positioned at the liquid phase downstream of the biological desulfurization tower, the liquid preparation tank is positioned at the liquid phase downstream of the sulfur paste filtering machine, and the biological desulfurization tower is positioned at the liquid phase downstream of the liquid preparation tank.

Preferably, a booster fan and a three-way valve are sequentially arranged at the downstream of the condensation dehydration unit; the gas mixer is provided with 3 inlets; the downstream end of the three-way valve is optionally provided with two conducting directions, one conducting direction is conducted to the biogas utilization end, and the other conducting direction is conducted to the rest inlet of the gas mixer.

Preferably, the biological desulfurization tower and/or the liquid preparation tank are/is provided with heating and heat-insulating facilities.

Preferably, a PLC controller is also arranged; 3 inlets of the gas mixer are respectively provided with a gas flowmeter, the downstream of the booster fan is provided with a biogas analyzer, and the gas flowmeter and the biogas analyzer are in signal connection with the PLC; the booster fan, the oxygen supply equipment and the heating and heat preservation equipment are in controlled connection with the PLC.

Preferably, the biological desulfurization tower is filled with two or three layers of spherical fillers, and desulfurization microorganisms are attached to the spherical fillers.

Preferably, the top of the biological desulfurization tower is also provided with 1-3 spray headers, and the spray headers are provided with spiral nozzles.

The integrated pure oxygen biological desulfurization reaction device designed by the technical scheme mainly comprises a gas mixer, a biological desulfurization tower, oxygen supply equipment, a liquid preparation tank and the like. The oxygen supply equipment can be an oxygen generator, an oxygen steel cylinder and the like, and is used for introducing pure oxygen into the gas mixer. The gas mixer is also communicated with the biogas to be treated from the anaerobic digestion tank, the biogas to be treated and the pure oxygen are fully mixed in the gas mixer and then enter the biological desulfurization tower, and in the biological desulfurization tower, desulfurization microorganisms treat the mixed gas and convert hydrogen sulfide in the biogas into elemental sulfur, sulfurous acid and sulfuric acid in the pure oxygen atmosphere. The sulfur paste filter, the liquid preparation tank and the biological desulfurization tower form a liquid phase circulation, the liquid preparation tank is a sealed structure, and the recyclable nutrient solution is arranged in the liquid preparation tank and is used for spraying into the biological desulfurization tower to provide nutrients for desulfurization microorganisms, and the nutrient solution flows from top to bottom to take away the converted elemental sulfur. The nutrient solution is collected and pumped to a sulfur paste filter for filtering, the single sulfur is filtered out to become a byproduct, and the filtered nutrient solution is sent back to the liquid preparation tank again for continuous circulation. Because only methane and pure oxygen and no nitrogen exist in the mixed gas, the desulfurization microorganism reaction is more active and the reaction efficiency is higher. The heat value of the treated methane cannot be influenced by the treatment process, and the application scene is greatly expanded. After pure oxygen is used, the liquid preparation tank does not need to be oxygenated in an aeration mode any more, so that the problem of peculiar smell pollution in the prior art is solved.

The desulfurized biogas is dehydrated and dried by a downstream condensation dehydration unit, and the dried biogas can be supplied to a downstream biogas utilization end only when being subjected to dynamic analysis and measurement by a biogas analyzer and meeting the standard. If the oxygen is excessive or the hydrogen sulfide exceeds the standard, the methane after primary treatment needs to be sent back to the gas mixer again for secondary treatment. The PLC controller and the three-way valve are designed for the scheme, the gas flow meter and the corresponding electromagnetic valves are arranged at 3 inlets of the gas mixer, the three-way valve, the gas flow meter and the methane analyzer are in signal connection with the PLC controller, whether processed methane needs to be sent back for secondary processing can be judged according to real-time data of the methane analyzer, the opening degree of each electromagnetic valve is accurately adjusted, and therefore the flow of each gas flow entering the 3 inlets of the gas mixer is finely adjusted, and the best processing effect is obtained. The loop which is conducted to the rest inlet of the gas mixer is provided with a booster fan, the opening direction of the three-way valve can be controlled through the PLC, the opening, the stopping and the rotating speed of the booster fan can be controlled, and the oxygen supply amount of the oxygen supply equipment is also controlled by the PLC. The connection mode of the related components and the PLC can be wired connection or wireless connection.

The biological desulfurization tower is filled with spherical filler, so that the biological desulfurization tower has a larger relative surface area, and is beneficial to the adhesion and growth of a large amount of desulfurization microorganisms on the spherical filler. The spray head is provided with the spiral nozzle, so that the nutrient solution can be uniformly and atomized and sprayed onto the spherical fillers, each spherical filler is kept in a moist state, and the stable growth environment of desulfurization microorganisms is maintained.

The biological desulfurization tower and/or the liquid preparation tank are/is provided with heating and heat preservation facilities, and are matched with an online temperature monitoring system and the like, and the desulfurization reaction temperature is ensured by regulating and controlling and switching an electromagnetic valve and the like by a PLC (programmable logic controller).

The device also comprises necessary pipelines, valves, water supply pipes, heat supply pipes, biogas slurry pipes, sewage pipes and the like which are conventional in the field, and the details are not repeated herein.

In conclusion, the beneficial effects of the scheme are that:

1. the pure oxygen is used for replacing air, so that the problem that the quality of the methane is reduced due to the fact that a large amount of useless gas is enriched in the air is solved;

2. the special efficient gas mixer for desulfurization is utilized to fully mix oxygen and methane, so that the utilization efficiency of oxygen in the biological desulfurization process is improved, and the consumption of pure oxygen is further reduced;

3. optimizing the control logic of an automatic control program, accurately interlocking the added oxygen with the flow of the biogas and the content of hydrogen sulfide in the biogas, controlling the residual oxygen content of the biogas within 0.5 percent, and reducing the influence of exogenous oxygen on the quality of the original biogas;

4. an integrated biological desulfurization integrated device is adopted, an aeration water tank is not needed, the odor problem caused by aeration can be avoided, and the deodorization investment and the operation cost are saved;

5. the technological process is optimized, a sulfur paste filter is added to carry out sulfur elementary substance filtering separation on the nutrient circulating liquid, so that the circulating liquid can be recycled, and the influence of the drainage and water adding processes on the acid-base environment in the biological desulfurization reactor is reduced;

6. the integrated online instrument comprises a liquid level meter, a thermometer, a pressure gauge, a PH meter, a methane analyzer and the like, and can continuously monitor the operation condition of the reactor;

7. the biogas reflux system is arranged, when the hydrogen sulfide content of the outlet biogas is higher or the residual oxygen content is too high, the reflux amount can be regulated and controlled in time, the biogas is conveyed to the front end of the desulfurization again for retreatment, the utilization efficiency of oxygen is fully improved, the desulfurization efficiency is improved, and the residual oxygen content is controlled.

Drawings

Fig. 1 is a schematic view of the connection relationship of the present invention.

Wherein: 1 anaerobic digestion tank, 2 gas mixer, 3 biological desulfurizing tower, 4 condensation dehydration unit, 5 booster fan, 6 oxygen supply equipment, 7 sulfur paste filter, 8 liquid preparation tank, 9 gas flowmeter, 10 methane analyzer, 11 three-way valve;

solid arrows indicate gas phase flow and dashed arrows indicate liquid phase flow.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description.

Examples

Referring to fig. 1, the embodiment is an integrated pure oxygen biological desulfurization reaction device, which is used for desulfurization treatment of biogas. Seen from the main flowing direction of the biogas, the main components of the device sequentially comprise an anaerobic digestion tank 1, a gas mixer 2, a biological desulfurization tower 3, a condensation dehydration unit 4, a booster fan 5 and an oxygen supply device 6; in addition, the biological desulfurization tower 3, a sulfur paste filter 7 and a liquid preparation tank 8 form a liquid phase circulation.

Specifically, the anaerobic digester 1 is the source of the biogas to be treated, and the oxygen supply equipment 6 is an oxygen generator, which is responsible for supplying pure oxygen. The biogas and the pure oxygen are mixed in the gas mixer 2, and the mixed gas is sent into the biological desulfurization tower 3 for biological desulfurization. In the desulfurization process, the desulfurization microorganisms consume oxygen in the mixed gas, and the desulfurized biogas flows into the downstream condensation dehydration unit 4 from the biological desulfurization tower 3 to be cooled and dehumidified, is pressurized by the pressurization fan 5 and is finally sent to a biogas utilization end.

A three-way valve 11 is arranged at the downstream of the booster fan 5, and a methane analyzer 10 is arranged between the booster fan 5 and the three-way valve 11. One of the outlet ends of the three-way valve 11 corresponds to a biogas utilization end, and the other outlet end corresponds to a loop returning to the gas mixer 2. If the real-time detected data of the methane analyzer 10 do not reach the standard, the unqualified methane is sent back to the gas mixer 2 again through the reversing of the three-way valve 11 for secondary treatment. For this purpose, the gas mixer 2 has 3 inlets, each of which is designed with a gas flow meter 9 and a corresponding solenoid valve to precisely control the gas flow.

In this example, the biological desulfurization tower 3 was filled with two layers of spherical packing, each layer of packing was 3.5 meters high, and desulfurization microorganisms adhered to the spherical packing. The top of the biological desulfurization tower 3 is also provided with 3 spray headers which are provided with spiral nozzles. The liquid preparation tank 8 is a sealing structure and is connected with the sulfur paste filter 7 and the liquid preparation tank 8 only through sealed pipelines. The prepared nutrient solution is stored in the liquid preparation tank 8, is conveyed into the biological desulfurization tower 3 through a pipeline, and is uniformly and atomizingly sprayed onto the filler by the spray header, so that each spherical filler is ensured to keep a moist state, and a stable growth environment of desulfurization microorganisms is maintained. The nutrient solution sprayed and dropped simultaneously washes the elemental sulfur formed by the transformation of the desulfurization microorganisms from the filler, and the elemental sulfur is collected and treated in a centralized way, wherein the elemental sulfur is filtered by pumping the liquid to a sulfur paste filter 7. The nutrient solution after the sulfur simple substance is filtered is sent into a solution preparation tank 8 to be prepared for continuous circulation.

The biological desulfurization tower 3 and the liquid preparation tank 8 are provided with corresponding heating and heat preservation facilities.

Each part is also correspondingly provided with a necessary thermometer, a pipeline, a valve, a water supply pipe, a heat supply pipe, a biogas slurry pipe, a sewage discharge pipe and the like, and the details are not repeated herein.

In order to improve the automation level and accurately control the desulfurization effect, the device is also provided with a PLC (not shown in the figure) gas flowmeter 9, a biogas analyzer 10, a three-way valve 11, a booster fan 5, oxygen supply equipment 6, various electromagnetic valves, thermometers, switches and adjusting mechanisms of heating and heat preservation facilities and the like which are in signal connection or controlled connection with the PLC, so that the whole device can be accurately controlled according to different parameters such as different temperatures, the content of hydrogen sulfide in biogas and the like, and the waste of pure oxygen is reduced on the premise of ensuring the desulfurization effect; the biogas does not contain a large amount of nitrogen any more, and the heat value is obviously improved; meanwhile, the liquid preparation tank 8 is fully sealed, is not contacted with the atmosphere at all, and does not emit odor gas.

Claims

1. The utility model provides an integral type pure oxygen biological desulfurization reaction unit, includes biological desulfurizing tower (3) and joins in marriage fluid reservoir (8), characterized by: the device also comprises an oxygen supply device (6) and a gas mixer (2);

the gas mixer (2) is provided with at least 2 inlets, wherein one inlet is used for connecting the biogas to be treated;

the downstream end of the oxygen supply device (6) is connected with the other inlet of the gas mixer (2);

the downstream end of the gas mixer (2) is connected with a biological desulfurization tower (3);

the liquid preparation tank (8) is a sealing structure and is communicated with the biological desulfurization tower (3) in a liquid phase.

2. The integrated pure oxygen biological desulfurization reaction device according to claim 1, characterized by further comprising a condensation dehydration unit (4); the condensation dehydration unit (4) is connected with the downstream of the biological desulfurization tower (3).

3. The integrated pure oxygen biological desulfurization reaction device according to claim 1, characterized in that it further comprises a sulfur paste filter (7); the sulfur paste filter (7) is positioned at the liquid phase downstream of the biological desulfurization tower (3), the liquid preparation tank (8) is positioned at the liquid phase downstream of the sulfur paste filter (7), and the biological desulfurization tower (3) is positioned at the liquid phase downstream of the liquid preparation tank (8).

4. The integrated pure oxygen biological desulfurization reaction device according to claim 2 or 3, wherein a booster fan (5) and a three-way valve (11) are further arranged at the downstream of the condensation dehydration unit (4) in sequence; the gas mixer (2) is provided with 3 inlets; the downstream end of the three-way valve (11) is optionally provided with two conducting directions, one conducting direction is conducted to the biogas utilization end, and the other conducting direction is conducted to the rest inlet of the gas mixer (2).

5. The integrated pure oxygen biological desulfurization reaction device according to claim 4, wherein the biological desulfurization tower (3) and/or the liquid distribution tank (8) is/are equipped with heating and heat-preserving facilities.

6. The integrated pure oxygen biological desulfurization reaction device according to claim 5, characterized in that a PLC controller is further provided; 3 inlets of the gas mixer (2) are respectively provided with a gas flowmeter (9), the downstream of the booster fan (5) is provided with a biogas analyzer (10), and the gas flowmeter (9) and the biogas analyzer (10) are in signal connection with the PLC; the booster fan (5), the oxygen supply equipment (6) and the heating and heat preservation equipment are in controlled connection with the PLC.

7. The integrated pure oxygen biological desulfurization reaction device according to claim 1, wherein the biological desulfurization tower (3) is filled with two or three layers of spherical fillers, and desulfurization microorganisms are attached to the spherical fillers.

8. The integrated pure oxygen biological desulfurization reaction device according to claim 7, wherein 1-3 spray headers are further installed on the top of the biological desulfurization tower (3), and spiral nozzles are installed on the spray headers.