CN219409636U - Concentrated gas storage and gas supply control system suitable for submerged combustion evaporation biogas - Google Patents
Concentrated gas storage and gas supply control system suitable for submerged combustion evaporation biogas Download PDFInfo
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- CN219409636U CN219409636U CN202222777893.3U CN202222777893U CN219409636U CN 219409636 U CN219409636 U CN 219409636U CN 202222777893 U CN202222777893 U CN 202222777893U CN 219409636 U CN219409636 U CN 219409636U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
The utility model discloses a concentrated biogas storage and supply control system suitable for submerged combustion evaporation, which comprises a biogas collection system, a biogas purification system, a biogas storage system and a biogas supply system, wherein the biogas collection system comprises a landfill site and a biogas booster fan which are connected in sequence; the landfill is used for generating and collecting methane; the biogas booster fan is used for boosting and conveying biogas; when the utility model is used, the biogas generated in the landfill site enters the particle filter through the conveying function of the booster fan, the particulate matters and a small part of condensed water mixed in the biogas are removed in the particle filter, the biogas enters the dehydration tank for dehydration, the dehydrated biogas is further dehydrated into hydrogen sulfide gas in the desulfurization tank, and the hydrogen sulfide gas enters the double-membrane gas holder from the bottom after passing through a simple condensation water tank. In a double membrane gas holder, biogas is stored, stabilized and further dehydrated.
Description
Technical Field
The utility model relates to the technical field of environmental engineering, in particular to a concentrated biogas storage and supply control system suitable for submerged combustion evaporation.
Background
The submerged combustion evaporation technology mainly uses marsh gas (or landfill gas on site or marsh gas generated by anaerobic) as a heat source, the marsh gas and air are conveyed to an evaporation chamber according to a certain proportion, and gas fuel is utilized to pressurize and burn on the subsurface of liquid, so that the technology is also called as submerged combustion evaporation technology, and is an evaporation technology without a fixed heat transfer interface.
In the design of early submerged combustion evaporation projects, no special biogas storage system is arranged, biogas storage is dependent on a landfill site or an anaerobic tank, and the two have limited gas storage capacity and vary greatly with seasons. The on-site gas supply adopts a methane fan, the gas supply directly conveys the methane of the refuse landfill or the anaerobic tank to the evaporation chamber, and then the methane is ignited by an igniter for evaporation. However, the landfill gas or anaerobic biogas contains hydrogen sulfide, solid particles and condensed water, and the biogas amount, the gas pressure and the methane content are variable, so that the following problems frequently occur in operation.
1. The landfill gas or anaerobic marsh gas often contains condensed water, if the condensed water enters an evaporation system along with marsh gas, insufficient combustion and heat loss are caused, even a large amount of carbon monoxide is generated, so that noncondensable gas cannot be discharged up to standard, and the marsh gas contains hydrogen sulfide gas, so that the noncondensable gas generated by evaporation contains excessive sulfur dioxide and cannot be directly discharged up to standard.
2. Because the biogas contains a certain amount of solid particles, the biogas pipeline can be blocked, or the pressure loss in the biogas conveying process can be increased, so that the biogas inlet pressure is insufficient.
3. Due to insufficient landfill gas or anaerobic biogas or insufficient methane content, biogas is difficult to ignite during ignition.
4. In the combustion process, the evaporation chamber is easy to flameout due to unstable air quantity and air pressure. The evaporation chamber is flamed out, so that unburned methane and air are accumulated in the evaporation chamber, potential safety hazards exist, the evaporation chamber is ignited again, on one hand, the on-site operation is delayed, the daily throughput is reduced, and on the other hand, the service life of the igniter can be shortened due to frequent ignition.
Disclosure of Invention
The utility model aims to provide a concentrated methane storage and supply control system suitable for submerged combustion evaporation of methane, so as to solve the problems in the background technology.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the system comprises a biogas collection system, a biogas purification system, a biogas storage system and a biogas supply system;
the biogas collection system comprises a refuse landfill and a biogas booster fan which are connected in sequence; the landfill is used for generating and collecting methane; the biogas booster fan is used for boosting and conveying biogas;
wherein, the biogas purification system comprises a particle filter, a dehydration tank and a desulfurization tank which are connected in sequence; the particle filter is used for filtering particulate matters and a small amount of condensed water mixed in the biogas; the dehydration tank is used for removing water in the biogas; the desulfurizing tank is used for removing HS gas mixed in the biogas;
the biogas storage system comprises a first condensate water tank, a condensate well and a double-membrane gas holder which are sequentially connected; the first condensate water tank is used for draining condensate water in the biogas; the condensate well is used for collecting and storing condensate water drained from the condensate water tank; the double-membrane gas holder is used for storing methane;
the biogas supply system comprises a second condensate water tank, a gas supply fan, a flame arrester, a submerged combustion evaporator and a sediment tank which are connected in sequence; the second condensate water tank is used for draining condensate water in the biogas; the gas supply fan is used for conveying and providing methane to the submerged combustion evaporation system; the flame arrester is used for isolating flame from escaping to the direction of the double-membrane gas holder; the submerged combustion evaporator is used for concentrating and crystallizing concentrated solution; the sediment tank is used for collecting sediment or crystallization generated in the submerged combustion evaporator and is removed periodically by a sediment conveying pump.
Preferably, a first flowmeter is installed at an air outlet of the methane booster fan, a second flowmeter is installed at an air outlet of the air supply fan, and the first flowmeter and the second flowmeter are used for measuring instantaneous flow and accumulated flow of methane.
Preferably, the air inlet of the particulate filter is provided with a first pressure gauge, the air outlet of the particulate filter is provided with a second pressure gauge, the air outlet of the second flowmeter is provided with a third pressure gauge, and the first pressure gauge, the second pressure gauge and the third pressure gauge are all used for displaying the pressure of methane.
Preferably, the double-film gas holder consists of a bottom film, an inner film, an outer film and a level gauge.
Preferably, an air inlet is formed in the outer portion of the double-film gas holder, a film blowing fan is mounted at the air inlet, and a pressure regulating valve is mounted at the outer portion of the double-film gas holder.
Preferably, a safe water seal is arranged on the condensate well.
Preferably, a PLC controller is arranged outside the dehydration tank.
Compared with the prior art, the utility model has the beneficial effects that:
1. according to the utility model, most of condensed water can be automatically removed through the dehydration tank, and the condensed water is periodically discharged into the condensate well through liquid level control, so that the dehydration rate is more than 90%, the thermal efficiency of methane is improved, and CO in non-condensable gas is discharged up to the standard;
2. when the utility model is used, after coming out of the booster fan, the biogas enters the particle filter through the flowmeter. The particle filter is filled with a large amount of sand or gravel, so that particles with the particle size of more than 50 mu m in the biogas can be effectively removed, the blockage of a long-term running pipeline is avoided, the pressure loss in biogas transportation is reduced, and the air inlet pressure of the biogas is ensured;
3. the desulfurizing tank of the utility model is filled with Fe 2 O 3 ﹒H 2 O desulfurizing agent which can react with hydrogen sulfide gas in methane to generate Fe 2 S 3 The purpose of desulfurization is achieved. When discoloration of the desulfurizing agent is observed or the pressure loss of the system is excessive, the desulfurizing agent should be discharged from the bottom of the column and placed in humid air, fe 2 S 3 Fe is regenerated 2 O 3 ﹒H 2 The O desulfurizing agent realizes the regeneration of the desulfurizing agent, can effectively remove sulfur in the biogas, has the desulfurizing efficiency of 70-80 percent, the removing rate of sulfur dioxide of more than 99 percent and avoids noncondensable gas SO 2 Failure to meet the standard or subsequent treatment yields higher treatment SO 2 And the cost is reduced, and the running cost is reduced.
4. Ensuring the gas quantity and pressure of the biogas and the methane content in the biogas, wherein the designed storage time is generally 1-2 hours, and the stable pressure is 10-20mbar. And the double-film gas holder can avoid the problems of steel structure corrosion and anti-freezing in winter in the traditional gas holder, and is rapid to install, economical and practical. The gas quantity, the gas pressure and the methane content of the methane are stabilized, so that the methane entering the evaporation chamber is easy to ignite, and is not easy to flameout in the combustion process, and the potential safety hazard caused by the accumulation of the methane in the evaporation chamber is avoided. And the normal and stable operation of the evaporation system can be ensured, the daily throughput of the site is ensured, the service life of the igniter is prolonged, and the operation cost is further reduced.
5. The utility model can realize full automation from collection, purification and centralized storage of the biogas to purification of the biogas, and the whole system can really realize centralized gas storage and automatic control of gas supply of the biogas by the PLC controller, thereby reducing the labor cost on site.
Drawings
FIG. 1 is a schematic diagram of a system for controlling the centralized gas storage and supply of biogas by submerged combustion evaporation according to the present utility model.
In the figure: 1. a landfill; 2. a methane booster fan; 3. a first flowmeter; 4. a first pressure gauge; 5. a second pressure gauge; 6. a particulate filter; 7. a dehydration tank; 8. a desulfurizing tank; 9. a first condensate water tank; 10. a condensate well; 11. a double-membrane gas holder; 12. a pressure regulating valve; 13. a film blowing fan; 14. safety water seal; 15. a second condensate water tank; 16. an air supply fan; 17. a second flowmeter; 18. a third pressure gauge; 19. a flame arrester; 20. submerged combustion evaporator; 21. a slag settling tank; 22. and a PLC controller.
Description of the embodiments
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1, an embodiment of the present utility model provides a system for controlling concentrated biogas storage and supply suitable for submerged combustion and evaporation, comprising: the system comprises a methane collecting system, a methane purifying system, a methane storage system and a methane supply system.
As shown in fig. 1, the biogas collection system comprises a refuse landfill 1 and a biogas booster fan 2 which are connected in sequence; the landfill 1 is used for generating and collecting methane; when the biogas booster fan 2 is used for boosting and conveying biogas, domestic garbage can be subjected to aerobic decomposition and anaerobic fermentation along with the extension of the landfill time of the landfill site 1 to finally generate the biogas, and the PE film can be covered on the upper part of the landfill region of the landfill site 1, so that the generated biogas can be collected in the landfill region, when the pressure of the biogas in the landfill region of the landfill site 1 reaches the set upper limit, the biogas booster fan 2 is automatically started, and when the pressure of the biogas in the landfill region reaches the set lower limit, the biogas booster fan 2 is automatically closed.
Wherein, the biogas purification system comprises a particle filter 6, a dehydration tank 7 and a desulfurization tank 8 which are connected in sequence; the particle filter 6 is used for filtering the particulate matters and a small amount of condensed water mixed in the marsh gas; the dehydration tank 7 is used for removing water in the biogas; the desulfurization tank 8 is used for removing H2S gas mixed in the biogas, when the biogas purification system is used, the biogas enters the particle filter 6 through the first flowmeter 3 after coming out of the biogas booster fan 2, a large amount of sand or gravel can be filled in the particle filter 6, solid particles with the size of more than 50 mu m can be effectively removed, a small part of condensed water can be removed, tempering and the like can be prevented, the particle filter 6 can be periodically provided with back flushing or filler replacement, the filtering effect of the particle filter 6 is improved, and when the biogas enters the dehydration tank 7 after coming out of the particle filter 6, a special baffle plate and a condensate tank are arranged in the dehydration tank 7, so that the biogas contacts with the baffle plate after entering the dehydration tank 7 from the bottom.
The biogas storage system comprises a first condensate water tank 9, a condensate well 10 and a double-membrane gas holder 11 which are sequentially connected; the first condensate water tank 9 is used for draining condensate water in the biogas; the condensate well 10 is used for collecting and storing condensate water drained from the condensate water tank; the double-membrane gas holder 11 is used for storing methane; when the biogas storage system is used, condensed water in biogas flows into a condensate tank at the bottom through adsorption and drainage functions of the baffle plates in the contact process of the biogas and the baffle plates, and is periodically discharged into a condensate well 10 through liquid level control, so that the effect of gas-water separation is finally achieved, the biogas coming out of a dehydration tank 7 enters a double-membrane gas holder 11 from the bottom, before entering the double-membrane gas holder 11, the biogas enters the double-membrane gas holder 11, firstly passes through a simple first condensate water tank 9, the condensed water in the first condensate water tank 9 is periodically discharged into the condensate well 10 according to the water quantity, the water in the condensate well 10 is periodically and automatically discharged into a condensate pool, the double-membrane gas holder 11 consists of a bottom membrane, an inner membrane, the bottom membrane and a material level gauge, and an outer membrane adopts a PVC/PVDF coating, so that the double-membrane gas holder has high strength and high self-cleaning property, the inner membrane bottom membrane has good air tightness and keeps inertia to methane and hydrogen sulfide. The inner membrane and the outer membrane are continuously blown by the membrane blowing fan 13, so that certain pressure, strength and flexibility of the inner membrane and the outer membrane are ensured, the double-membrane gas holder 11 can store methane, a certain water seal layer is arranged at the bottom of the double-membrane gas holder, and the double-membrane gas holder is matched with the safety water seal 14 arranged on the condensate well 10, so that the leakage of methane is avoided, and meanwhile, a small part of condensed water can be removed.
Wherein, the methane supply system comprises a methane supply systemThe secondary connection of the second condensate water tank 15, the air supply fan 16, the flame arrester 19, the submerged combustion evaporator 20 and the sediment tank 21; the second condensate water tank 15 is used for draining condensate water in the biogas; the gas supply fan 16 delivers and supplies biogas to the submerged combustion vaporization system; the flame arrester 19 is used for isolating flame from escaping to the direction of the double-membrane gas holder 11; submerged combustion evaporator 20 is used for concentrate concentration and crystallization; the sediment tank 21 is used for collecting sediment or crystallization generated in the submerged combustion evaporator 20 and periodically removing the sediment or crystallization by a sediment conveying pump, when the biogas supply system is used, biogas from the dehydration tank 7 enters the desulfurization tank 8 from the bottom, and Fe is filled in the desulfurization tank 8 2 O 3 ﹒H 2 O desulfurizing agent which can react with hydrogen sulfide gas in methane to generate Fe 2 S 3 The purpose of desulfurization is achieved. When discoloration of the desulfurizing agent is observed or the pressure loss of the system is excessive, the desulfurizing agent should be discharged from the bottom of the tower and placed in humid air, fe2S3 regenerates Fe 2 O 3 ﹒H 2 And O desulfurizing agent to realize the regeneration of desulfurizing agent.
As shown in fig. 1, in order to facilitate the inflation molding after the double-film gas holder 11 is installed and control the pressure value of the inlet gas and the outlet gas, an air inlet is arranged at the outside of the double-film gas holder 11, and a film blowing fan 13 is installed at the air inlet and a pressure regulating valve 12 is installed at the outside of the double-film gas holder 11.
As shown in fig. 1, in order to show the pressure of biogas circulation, the air inlet of the particle filter 6 is provided with a first pressure gauge 4, the air outlet of the particle filter 6 is provided with a second pressure gauge 5, and the air outlet of the second flowmeter 17 is provided with a third pressure gauge 18.
As shown in fig. 1, in order to measure the instantaneous flow and the accumulated flow of the biogas, a first flowmeter is installed at the air outlet of the biogas booster fan, and a second flowmeter is installed at the air outlet of the air supply fan.
The embodiment also provides a control method for concentrated gas storage and gas supply of the submerged combustion evaporated biogas, which comprises the following steps:
s1, decomposing organic matters in garbage through various microorganisms under the conditions of isolating air, keeping certain moisture, temperature, pH and the like to generate methane;
s2, under the action of a booster fan, the biogas is conveyed to a particle filter by a collecting pipeline, the particle filter is of an airtight double-chamber structure, a large amount of sand or gravel is filled in the particle filter, an automatic condensed water collecting device and a drainage device are arranged at the bottom of the particle filter, and the particle filter can remove particulate matters and a small part of condensed water mixed in the biogas and can serve as a safety device for preventing tempering;
s3, after passing through the particle filter, the biogas enters a dehydration tank, and most of condensed water is removed in the dehydration tank. The inside of the dehydration tank is provided with a baffle plate which is specially arranged, the baffle plate is made of hydrophilic materials, when methane enters the dehydration tank from the bottom, the methane and entrained moisture and the like can strike the baffle plate when rising, and due to the adsorption and flow guiding effects of the baffle plate, condensed water in the methane can flow into a water tank at the bottom along the baffle plate, and then is discharged out of the system, and the methane is discharged out of the dehydration tank from the top;
s4, dehydrating by a dehydration tank, and then allowing methane to enter a desulfurization tank, wherein a desulfurizing agent filler adopted in the desulfurization tank is Fe 2 O 3 ﹒H 2 O, after desulfurization by a desulfurization tank, H in methane 2 S concentration is lower than 100 ppm;
s5, after passing through the desulfurizing tank, the biogas enters a double-membrane gas holder, before entering the double-membrane gas holder, the biogas is subjected to a simple condensate water tank, the condensate water tank is placed in a condensate well, water in the condensate water tank is periodically discharged into the condensate water tank, the double-membrane gas holder mainly comprises an outer membrane, an inner membrane and a bottom membrane, and the biogas storage capacity of the double-membrane gas holder is 1-2;
s6, conveying the biogas in the double-membrane gas holder into the submerged combustion evaporator through a gas supply fan according to the requirement of submerged combustion evaporation of the biogas, and in the conveying process, dehydrating the biogas through a simple condensation water tank, then passing through a fire arrestor, and finally entering the evaporator for complete combustion.
Specifically, in S5, the storage pressure of the double-membrane gas holder is 35mbar, the maximum snow load is designed to be 150kg/m2, and the maximum wind load is designed to be 150km/h.
In the embodiment, the PLC controller 22 is arranged outside the dehydration tank 7, and the whole system can realize full automation through the PLC controller 22 from collection, purification and centralized storage of methane to purification of methane, thereby realizing centralized gas storage and automatic control of gas supply of the methane.
None of the utility models are related to the same or are capable of being practiced in the prior art. Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a be applicable to submerged combustion evaporation marsh gas concentrate gas storage and gas supply control system, includes marsh gas collecting system, marsh gas purifying system, marsh gas storage system and marsh gas supply system, its characterized in that:
the biogas collection system comprises a refuse landfill (1) and a biogas booster fan (2) which are connected in sequence;
the biogas storage system comprises a first condensate water tank (9), a condensate well (10) and a double-membrane gas holder (11) which are connected in sequence;
the biogas supply system comprises a second condensate water tank (15), a gas supply fan (16), a flame arrester (19), a submerged combustion evaporator (20) and a sediment tank (21) which are connected in sequence;
the biogas purification system comprises a particle filter (6), a dehydration tank (7) and a desulfurization tank (8) which are sequentially connected.
2. A concentrated biogas storage and supply control system adapted for submerged combustion and vaporization of biogas as defined in claim 1, wherein: the air outlet of the biogas booster fan (2) is provided with a first flowmeter (3), and the air outlet of the air supply fan (16) is provided with a second flowmeter (17).
3. A concentrated biogas storage and supply control system adapted for submerged combustion and vaporization of biogas as defined in claim 2, wherein: the air inlet of the particle filter (6) is provided with a first pressure gauge (4), the air outlet of the particle filter (6) is provided with a second pressure gauge (5), and the air outlet of the second flowmeter (17) is provided with a third pressure gauge (18).
4. A concentrated biogas storage and supply control system adapted for submerged combustion and vaporization of biogas as defined in claim 1, wherein: the double-film gas holder (11) consists of a bottom film, an inner film, an outer film and a material level meter.
5. A concentrated biogas storage and supply control system adapted for submerged combustion and vaporization of biogas as defined in claim 4, wherein: the outside of double-film gas holder (11) is equipped with the air intake, and the air intake is installed and is blown film fan (13), the externally mounted of double-film gas holder (11) has air-vent valve (12).
6. A concentrated biogas storage and supply control system adapted for submerged combustion and vaporization of biogas as defined in claim 1, wherein: and a safety water seal (14) is arranged on the condensate well (10).
7. A concentrated biogas storage and supply control system adapted for submerged combustion and vaporization of biogas as defined in claim 1, wherein: and a PLC (programmable logic controller) 22 is arranged outside the dehydration tank 7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222777893.3U CN219409636U (en) | 2022-10-21 | 2022-10-21 | Concentrated gas storage and gas supply control system suitable for submerged combustion evaporation biogas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222777893.3U CN219409636U (en) | 2022-10-21 | 2022-10-21 | Concentrated gas storage and gas supply control system suitable for submerged combustion evaporation biogas |
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| CN219409636U true CN219409636U (en) | 2023-07-25 |
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| CN202222777893.3U Active CN219409636U (en) | 2022-10-21 | 2022-10-21 | Concentrated gas storage and gas supply control system suitable for submerged combustion evaporation biogas |
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- 2022-10-21 CN CN202222777893.3U patent/CN219409636U/en active Active
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