CN111575074A - Pretreatment system for biogas production - Google Patents
Pretreatment system for biogas production Download PDFInfo
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- CN111575074A CN111575074A CN202010375489.6A CN202010375489A CN111575074A CN 111575074 A CN111575074 A CN 111575074A CN 202010375489 A CN202010375489 A CN 202010375489A CN 111575074 A CN111575074 A CN 111575074A
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- biogas
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
- C10L3/102—Removal of contaminants of acid contaminants
- C10L3/103—Sulfur containing contaminants
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Abstract
A pre-treatment system for biogas production comprising a pre-coarse filtration and pressurization system: filtering the biogas, and boosting the filtered biogas in a booster fan; a desulfurization system: the system comprises a desulfurizing tower, a circulating water system, a regeneration system, a nutrient solution and alkali liquor system, a wastewater discharge and water supplement system and a dry-method fine desulfurization system, and is used for desulfurizing the biogas; a refrigeration dehydration system: the refrigerating unit is an air-cooled closed cooling circulation and is used for cooling the desulfurized methane; post-positioned pressure boosting fine filtering system: intercepting fine impurities; a torch system: and treating the methane which cannot be utilized. The generated biogas enters a preposed coarse filtration and pressurization system to perform primary filtration of partial liquid water and larger particles, a series of desulfurization reactions are performed in a desulfurization system, then the biogas is cooled by a refrigeration dehydration system, and finally fine impurities are filtered by a postposition pressurization fine filtration system. All the structures cooperate with each other to finish the pretreatment work of the methane production.
Description
Technical Field
The invention relates to the field of biogas production, in particular to a pretreatment system for biogas production.
Background
The methane combustion power generation is a methane utilization technology which appears along with the continuous development of large-scale methane tank construction and methane comprehensive utilization, and the methane generated by anaerobic fermentation treatment is used on an engine and is provided with a comprehensive power generation device to generate electric energy and heat energy. The biogas power generation has the characteristics of efficiency creation, energy conservation, safety, environmental protection and the like, and is a distributed energy source with wide distribution and low price.
However, in the process of generating electricity by using biogas, the generator set is particularly sensitive to components such as hydrogen sulfide in the biogas due to the characteristics of the design and materials of the biogas generator set. The hydrogen sulfide has strong corrosivity to metals such as iron and the like, and is easy to adsorb the metal surface to react with various metal ions to generate water-insoluble sulfide precipitates. When the biogas is combusted, hydrogen sulfide in the biogas can be converted into sulfurous acid aerosol with strong corrosivity, so that the environment and machine equipment can be polluted, and meanwhile, the hydrogen sulfide has strong corrosivity on metal pipelines, combustion equipment, detection equipment, instruments and the like in a humid environment, so that the hydrogen sulfide contained in the biogas must be removed before the biogas is used. When the biogas is used for power generation, hydrogen sulfide in the biogas can cause serious corrosion to an air inlet pipeline, a supercharger, an intercooler, a spark plug, a cylinder sleeve, an exhaust pipe, a silencer and the like of the biogas generator set, so that the service life of the generator set is influenced. Therefore, the biogas must be pretreated before entering the generator set.
The pretreatment system for biogas production at the present stage has the following defects: 1) the desulfurization efficiency is poor, and the treatment effect is only 80-90%; 2) the packing of the desulfurizing tower contains a large amount of elemental sulfur, the desulfurizing tower is blocked within half a year, and the desulfurizing tower needs to be maintained; 3) the steam-water separator can only remove condensed water in the methane, wherein the condensed water is not easy to remove, so that the air inlet pressure loss of the generator set is overlarge, and under the serious condition, the phenomena of engine power fluctuation, cylinder knocking, halt and the like can be caused to seriously affect the service life of the generator set.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a pretreatment system for biogas production, which solves the problems existing in the process of pretreatment of biogas.
The technical scheme is as follows: the invention provides a pretreatment system for biogas production, which comprises
Pre-coarse filtration and pressurization system: filtering the biogas, and boosting the filtered biogas in a booster fan;
a desulfurization system: the system comprises a desulfurizing tower, a circulating water system, a regeneration system, a nutrient solution and alkali liquor system, a wastewater discharge and water supplement system and a dry-method fine desulfurization system, and is used for desulfurizing the biogas;
a refrigeration dehydration system: the refrigerating unit is an air-cooled closed cooling circulation and is used for cooling the desulfurized methane;
post-positioned pressure boosting fine filtering system: intercepting fine impurities;
a torch system: and treating the methane which cannot be utilized.
The generated biogas enters a preposed coarse filtration and pressurization system to perform primary filtration of partial liquid water and larger particles, a series of desulfurization reactions are performed in a desulfurization system, then the biogas is cooled by a refrigeration dehydration system, and finally fine impurities are filtered by a postposition pressurization fine filtration system. All the structures cooperate with each other to finish the pretreatment work of the methane production.
Furthermore, the filter element of the pre-coarse filtration and pressurization system is made of stainless steel, the filtration precision of the filter element is 50 microns, and pressure difference meters are arranged at the front end and the rear end of the filter. Stainless steel avoids contacting water in the filtering process and leads to rustting, thereby influencing the filtering work. And when the pressure difference is larger than 2kPa, replacing the filter element.
Furthermore, a desulfurizing tower of the desulfurizing system and a desulfurizing tower body in the circulating water system are made of glass fiber reinforced plastics, and an anti-corrosion grid and a supporting beam are arranged in the desulfurizing tower; the outer layer of the desulfurizing tower is provided with a polyurethane or felt heat-insulating layer, a color steel plate protective layer is arranged outside the heat-insulating layer, and UV protective paint is brushed outside the color steel plate protective layer.
Furthermore, pressure gauges are arranged above and below the desulfurizing tower. And indicating the pressure loss change of the desulfurizing tower according to the pressure difference.
Furthermore, the regeneration system of the desulfurization system comprises a regeneration tank and a sedimentation tank which are connected through a pipeline. The elemental sulfur generated in the regeneration tank enters a sedimentation tank along with a pipeline, and the circulating water after sedimentation is pumped into the regeneration tank through a convection pump. And a sewage discharge outlet is arranged at the bottom of the sedimentation tank, so that the precipitated sulfur sludge can be discharged to a water collecting well. Thereby avoiding the blockage phenomenon of the desulfurizing tower.
Further, a temperature sensor is arranged in the regeneration tank; an aeration device and an online metering and detecting device are arranged at the bottom of the regeneration tank; and a sewage discharge outlet is formed at the bottom of the sedimentation tank. Proper temperature is needed in the growth and desulfurization process of the biological desulfurization bacteria, and a proper temperature environment is provided for the biological desulfurization bacteria in a hot water heating mode; the online metering detection device controls the flow of the aeration fan, thereby strictly controlling the content of the dissolved oxygen.
Furthermore, a refrigerating unit in the refrigeration dehydration system is provided with an air cooler which is connected with a refrigerating machine in series. The temperature of the gas is reduced by the refrigeration equipment so that the water vapor therein condenses and then exits the system. When the environment temperature is lower than-10 ℃, the water chilling unit does not work, and as long as the circulating water pump is in the running state, the natural cold source in winter can be used for cooling and dehumidifying the methane, so that the energy utilization rate is improved.
Further, a heat exchanger tube pass in a refrigerating unit in the refrigeration dehydration process is made of stainless steel 304, and a high-efficiency vapor-liquid separation device is arranged inside the heat exchanger tube pass. Avoiding rusting and effectively separating condensed water.
Furthermore, a micro-pressure difference filter is selected as a precise filtering device in the post-pressurizing fine filtering system, and the filtering precision is 3 microns; the fine filter shell is made of carbon steel for corrosion prevention, and the filter element is made of pp material; and a differential pressure metering device is arranged at the inlet and the outlet of the filter. The biogas is further filtered by fine impurities, so that the purity of the biogas is improved, and the utilization efficiency of the fuel gas is improved. And replacing the filter element according to the pressure difference change of the pressure difference metering device.
Further, the torch system adopts a form of a ground-falling closed type incineration torch, and a flame arrester and a flame monitor are arranged at an inlet of the torch system. When the device is operated, the outside does not see naked flame, and a flame arrester and a flame monitor are arranged, so that the safety performance is improved.
The technical scheme shows that the invention has the following beneficial effects: 1) biological desulfurization and dry fine desulfurization are carried out, so that the desulfurization capacity is improved and can reach more than 95%; 2) a sedimentation tank is arranged at the outlet of the regeneration tank system and is matched with a circulating water system to discharge the generated elemental sulfur regularly, so that the blockage phenomenon of the desulfurizing tower is avoided, and the desulfurizing capacity is improved; 3) a refrigeration dehydration system is arranged to condense water vapor in the biogas into water, and the water vapor is removed through a high-efficiency vapor-liquid separation device, so that the service life of the equipment is prolonged; 4) the filter inlet and outlet of the coarse and fine filtering system are provided with the pressure difference metering device, and the filter element is replaced in time through pressure difference change, so that frequent replacement is avoided, loss is increased, and poor filtering effect caused by untimely replacement is avoided.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a flow diagram of a desulfurization system.
In the figure: none.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Example one
FIG. 1 shows a flow chart of the present invention, comprising
Pre-coarse filtration and pressurization system: filtering the biogas, and boosting the filtered biogas in a booster fan; in order to protect the pressurizing fan and prevent anaerobic biogas from carrying dust, organic matters, liquid water, grease and the like to enter the biological desulfurization system, a filter is required to be adopted to filter the biogas. The filter is designed to have a large filtering area and has the function of removing part of liquid water and larger particles.
A desulfurization system: FIG. 2 shows a flow chart of a desulfurization system, which comprises a desulfurization tower, a circulating water system, a regeneration system, a nutrient solution and alkali solution system, a wastewater discharge and water supplement system and a dry-method fine desulfurization system, and is used for desulfurization treatment of biogas; FIG. 2 shows a flow diagram of a desulfurization system. The sulfur-containing methane enters from the bottom of the packed tower and is fully contacted with alkaline circulating water (barren liquor) entering from the top of the tower on the surface of the packing of the desulfurizing tower, and sulfides such as hydrogen sulfide and the like are subjected to chemical reaction with the alkaline liquor, so that the aim of desulfurizing is fulfilled. And the circulating water (rich liquid) after reaction enters a regeneration tank through the bottom of the desulfurization tower. The sulfur-containing compounds in the rich solution are converted into elemental sulfur under the action of desulfurization bacteria and oxygen in the regeneration tank, and the regeneration of the lean solution is completed. The elemental sulfur turbid solution generated by the regeneration tank enters a sedimentation tank for sedimentation, and is finally discharged and discharged out of the biological desulfurization system for recycling through periodic discharge. The microorganism growth needs certain nutrient elements, the nutrient substance adding system can automatically add nutrient solution into the regeneration tank, and the adding amount is accurately controlled by the metering pump. The alkali liquor adding system can automatically add alkali liquor for adjustment according to the change of the pH value of circulating water, so that the pH value of the solution is stabilized in an optimal reaction region. The addition of lye is controlled by a metering pump. The periodic sulfur sludge discharge can lead to the reduction of the circulating water quantity, and the reduction of the circulating water can keep the water level balance of the regeneration tank and the sedimentation tank in an automatic water replenishing mode so as to achieve the purpose of automatic water replenishing of the system.
A refrigeration dehydration system: the refrigerating unit is an air-cooled closed cooling circulation and is used for cooling the desulfurized methane;
post-positioned pressure boosting fine filtering system: intercepting fine impurities;
a torch system: and treating the methane which cannot be utilized. And when the gas production amount of the system is larger than the gas consumption amount or the system is maintained and overhauled, starting the incineration torch.
The filter element of the filter in the preposed coarse filtration and pressurization system is made of stainless steel, the filtration precision is 50 μm, pressure difference meters are arranged at the front end and the rear end of the filter, and when the pressure difference is larger than 2kPa, the filter element is replaced.
The desulfurizing tower of the desulfurizing system and the desulfurizing tower body of the circulating water system are made of glass fiber reinforced plastics, and an anti-corrosion grating and a supporting beam are arranged in the desulfurizing tower. The outer layer of the desulfurizing tower is provided with a polyurethane or felt heat-insulating layer, a color steel plate protective layer is arranged outside the heat-insulating layer, and UV protective paint is brushed outside the color steel plate protective layer.
And pressure gauges are arranged above and below the desulfurizing tower to indicate the pressure loss change of the desulfurizing tower.
Furthermore, the regeneration system of the desulfurization system comprises a regeneration tank and a sedimentation tank which are connected through a pipeline. The elemental sulfur generated in the regeneration tank enters a sedimentation tank along with a pipeline, and the circulating water after sedimentation is pumped into the regeneration tank through a convection pump. And a sewage discharge outlet is arranged at the bottom of the sedimentation tank, so that the precipitated sulfur sludge can be discharged to a water collecting well. The sulfur sludge is discharged in batches and is discharged once to twice every day. Thereby avoiding the blockage phenomenon of the desulfurizing tower.
Further, a temperature sensor is arranged in the regeneration tank; an aeration device and an online metering and detecting device are arranged at the bottom of the regeneration tank; and a sewage discharge outlet is formed at the bottom of the sedimentation tank. Proper temperature is needed in the growth and desulfurization process of the biological desulfurization bacteria, and a proper temperature environment is provided for the biological desulfurization bacteria in a hot water heating mode; the heating hot water comes from tail water of an anaerobic fermentation heating system, the hot water can be used less or not in summer, and the hot water is directly used in winter. The online metering detection device controls the flow of the aeration fan, thereby strictly controlling the content of the dissolved oxygen.
The refrigerating unit in the refrigeration dehydration system is provided with an air cooler which is connected with a refrigerator in series.
The tube side of a heat exchanger in the refrigerating unit in the refrigeration dehydration process is made of stainless steel 304, and a high-efficiency vapor-liquid separation device is arranged in the heat exchanger.
The precise filtering device in the post-pressurizing precise filtering system adopts a micro-pressure difference filter with the filtering precision of 3 mu m. The fine filter shell is made of carbon steel and is corrosion-resistant. The filter element is made of pp material. And a differential pressure metering device is arranged at the inlet and the outlet of the filter. The torch system adopts a form of a ground-falling closed type incineration torch, open fire is not seen outside during operation, and a flame arrester and a flame monitor are arranged at an inlet of the torch system, so that the safety is improved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.
Claims (10)
1. A pretreatment system for biogas production, characterized in that: comprises that
Pre-coarse filtration and pressurization system: filtering the biogas, and boosting the filtered biogas in a booster fan;
a desulfurization system: the system comprises a desulfurizing tower, a circulating water system, a regeneration system, a nutrient solution and alkali liquor system, a wastewater discharge and water supplement system and a dry-method fine desulfurization system, and is used for desulfurizing the biogas;
a refrigeration dehydration system: the refrigerating unit is an air-cooled closed cooling circulation and is used for cooling the desulfurized methane;
post-positioned pressure boosting fine filtering system: intercepting fine impurities;
a torch system: and treating the methane which cannot be utilized.
2. Pretreatment system for biogas production according to claim 1, characterized in that: the filter element of the pre-coarse filtration and pressurization system is made of stainless steel, the filtration precision of the filter element is 50 mu m, and pressure difference meters are arranged at the front end and the rear end of the filter.
3. Pretreatment system for biogas production according to claim 1, characterized in that: the desulfurizing tower of the desulfurizing system and the desulfurizing tower body of the circulating water system are made of glass fiber reinforced plastics, and an anti-corrosion grid and a supporting beam are arranged in the desulfurizing tower; the outer layer of the desulfurizing tower is provided with a polyurethane or felt heat-insulating layer, a color steel plate protective layer is arranged outside the heat-insulating layer, and UV protective paint is brushed outside the color steel plate protective layer.
4. A pretreatment system for biogas production according to claim 1 or 3, characterized in that: and pressure gauges are arranged above and below the desulfurizing tower.
5. Pretreatment system for biogas production according to claim 1, characterized in that: the regeneration system of the desulfurization system comprises a regeneration tank and a sedimentation tank which are connected through a pipeline.
6. Pretreatment system for biogas production according to claim 1 or 5, characterized in that: a temperature sensor is arranged in the regeneration tank; an aeration device and an online metering and detecting device are arranged at the bottom of the regeneration tank; and a sewage discharge outlet is formed at the bottom of the sedimentation tank.
7. Pretreatment system for biogas production according to claim 1, characterized in that: the refrigerating unit in the refrigeration dehydration system is provided with an air cooler which is connected with a refrigerator in series.
8. Pretreatment system for biogas production according to claim 1 or 7, characterized in that: the tube side of a heat exchanger in the refrigerating unit in the refrigeration dehydration process is made of stainless steel 304, and a high-efficiency vapor-liquid separation device is arranged in the heat exchanger.
9. Pretreatment system for biogas production according to claim 1, characterized in that: a micro-pressure difference filter with the filtering precision of 3 mu m is selected as a precise filtering device in the post-pressurizing fine filtering system; the fine filter shell is made of carbon steel for corrosion prevention, and the filter element is made of pp material; and a differential pressure metering device is arranged at the inlet and the outlet of the filter.
10. Pretreatment system for biogas production according to claim 1, characterized in that: the torch system adopts a form of a ground-falling closed type incineration torch, and a flame arrester and a flame monitor are arranged at an inlet of the torch system.
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| CN202010375489.6A CN111575074A (en) | 2020-05-07 | 2020-05-07 | Pretreatment system for biogas production |
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| CN202010375489.6A CN111575074A (en) | 2020-05-07 | 2020-05-07 | Pretreatment system for biogas production |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113430025A (en) * | 2021-07-14 | 2021-09-24 | 深高蓝德环保科技集团股份有限公司 | Anaerobic biogas biological desulfurization treatment device and method |
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| CN113430025A (en) * | 2021-07-14 | 2021-09-24 | 深高蓝德环保科技集团股份有限公司 | Anaerobic biogas biological desulfurization treatment device and method |
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Application publication date: 20200825 |