A device for comprehensive treatment of anaerobic biogas from sewage station
By designing a device for comprehensively treating anaerobic biogas in sewage stations, and using components such as MDEA desulfurization and decarbonization towers and liquid lean regeneration towers, the problems of low resource utilization rate and environmental pollution in rural sewage are solved, and efficient and safe sewage treatment and resource utilization are achieved.
Patent Information
- Application Number
- CN202420820610.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-19
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-04-19
AI Technical Summary
The low utilization rate of anaerobic biogas in rural sewage, acid gas pollution to the environment, and biogas leakage endangers human health.
Design a device for comprehensively treating anaerobic biogas in sewage stations, including MDEA desulfurization and decarbonization tower, liquid lean regeneration tower, liquid lean tank, liquid rich tank, air preheater and rich and poor heat exchanger. Through the cascade resource utilization and self-cleaning functions, efficient processing and utilization can be achieved.
The cascade resource utilization of low-grade thermal energy has been achieved. Through gas boiler heating and natural gas sales, the high-value resource utilization rate of sewage anaerobic biogas is improved, and environmental pollution and maintenance costs are reduced.
Smart Images
Figure CN222700251U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of biogas resource utilization and relates to a device for comprehensively treating anaerobic biogas from a sewage station. Background Art
[0002] At present, rural sewage treatment is affected by factors such as the dispersion of sewage collection points, the long length of pipeline laying and the high cost. Many areas cannot collect sewage to urban sewage treatment stations for centralized treatment. Most of them choose to deal with it on the spot according to local conditions. Among them, rural sewage anaerobic biogas digester technology is widely used due to its low operating cost and good sewage purification effect. The current application scenario of rural sewage anaerobic biogas is generally combined with biogas stoves, biogas rice cookers, biogas lamps and biogas water heaters for farmers to cook, light and bathe. In the application process, there are disadvantages such as low resource utilization rate, acidic gas pollution of the environment, and biogas leakage endangering human health. To this end, a device for comprehensive treatment of anaerobic biogas in sewage stations is designed to overcome the above problems. Utility Model Content
[0003] The utility model aims to overcome the shortcomings of the prior art and provide a device for comprehensively treating anaerobic biogas from a sewage station which has a simple structure, is safe and practical, has a high resource utilization rate, has a self-cleaning function and has a low maintenance cost.
[0004] The utility model is realized through the following technical scheme: a device for comprehensively treating anaerobic biogas from a sewage station, the device is composed of an MDEA desulfurization and decarbonization tower, a lean liquid regeneration tower, a lean liquid tank, a rich liquid tank, an air preheater, and a lean and rich liquid heat exchanger. An anaerobic biogas inlet channel is provided at one end of the MDEA desulfurization and decarbonization tower, a gas phase channel is provided above the MDEA desulfurization and decarbonization tower, and a liquid phase channel is provided at the bottom, wherein the liquid phase channel is connected to the rich liquid tank, and the gas phase channel is connected to a drying tower. Two pipelines are provided at the rear of the drying tower, one of which is connected to a compressor. It is connected to the odorizer, and after being compressed by the compressor and odorized by the odorizer, it is fed into the municipal natural gas pipeline network for sale. The other route is evenly mixed with the fresh air heated by the air preheater and then led to the gas boiler for combustion. After combustion, hot steam and high-temperature flue gas are generated. The hot steam is used as a heat source for heating and bathing in villages, and the high-temperature flue gas enters the lean liquid regeneration tower to provide the required heat for the regeneration of the MDEA desulfurization and decarbonization tower. Finally, the flue gas coming out of the MDEA desulfurization and decarbonization tower is discharged to the outside through the air preheater. In the air preheater, the heat of the flue gas is used as the heat source for heating the above-mentioned fresh air.
[0005] Preferably, the lean liquid regeneration tower is connected to the lean liquid tank and the rich liquid tank respectively through lean and rich liquid heat exchangers, and the lean liquid tank is also connected to the MDEA desulfurization and decarbonization tower for reflux. A circulating pipeline with a circulating pump is also provided between the bottom and the top of the MDEA desulfurization and decarbonization tower to reflux the liquid at the bottom to the top of the tower.
[0006] Preferably: the lean liquid regeneration tower consists of an insulation layer and a lean liquid regeneration space layer, wherein the insulation layer is insulated by the high-temperature flue gas generated by the gas boiler, and a pipe with a sprinkler head is installed above the lean liquid regeneration space layer. The pipe passes through a lean-rich liquid heat exchanger to flow the rich liquid in the rich liquid tank into the lean liquid regeneration tower. A liquid outlet is provided at the bottom of the lean liquid regeneration tower, and the liquid outlet is connected to the lean-rich liquid heat exchanger through a liquid outlet pipe, and the lean liquid flows into the lean liquid tank through the lean-rich liquid heat exchanger.
[0007] Preferably, a plurality of baffles inclined downward are installed in the lean liquid regeneration space layer in the middle of the lean liquid regeneration tower. The baffles are arranged relative to and crosswise to form multiple S-shaped flow channels in the entire lean liquid regeneration space layer, so as to extend the residence time of the rich liquid in the regeneration tower while fully increasing the disturbance and improving the molecular Brownian motion, thereby ensuring the full regeneration reaction from rich liquid to lean liquid. The baffles have a self-cleaning effect and rely on the repeated flushing of the solution from high to low to avoid the deposition of impurities.
[0008] Preferably, a plurality of hot flue gas distribution openings are provided on the insulation layer of the lean liquid regeneration tower, and the hot flue gas is fully arranged in the insulation layer through the plurality of hot flue gas distribution openings to achieve insulation of the lean liquid regeneration tower.
[0009] Compared with the prior art, the utility model has the following beneficial effects:
[0010] 1. The utility model realizes the cascade resource utilization of low-grade thermal energy, including a lean-rich liquid heat exchanger, an air preheater, etc.
[0011] 2. The entire process of the utility model has no external energy input. It uses gas boilers for heating and natural gas for sale. While realizing high-value resource utilization of sewage anaerobic biogas, it also achieves cascade utilization of energy, and high-temperature flue gas is used as a heat source for the regeneration tower.
[0012] 3. The rural sewage anaerobic biogas of the utility model produces high-value natural gas and steam that can be used as a heat source for bathing after being treated by this process, thus avoiding the direct use of biogas, protecting the physical and mental health of villagers, and greatly reducing the impact on the environment.
[0013] 4. The lean liquid regeneration tower of the utility model includes two layers of hard isolation structure inside and outside and a middle flue gas channel, wherein the outer layer is a heat preservation layer, the inner layer is a lean liquid regeneration space, and the middle layer is a high-temperature flue gas channel. A baffle with a certain slope is designed on the inner lean liquid regeneration space structure, which serves to extend the residence time of the rich liquid in the regeneration tower, fully increase the disturbance, improve the molecular Brownian motion, and ensure the full progress of the regeneration reaction from rich liquid to lean liquid.
[0014] 5. The lean liquid regeneration tower in the utility model has a baffle with a certain slope, which has a self-cleaning effect. It relies on the repeated flushing of the solution from high to low to avoid the deposition of impurities and has low maintenance costs.
[0015] 6. The lean liquid regeneration tower in the utility model is designed with multiple hot flue gas distribution ports to ensure uniform temperature inside the regeneration tower.
[0016] 7. The MDEA desulfurization and decarbonization tower of the utility model has three spray layers and an independent packing tower, each of which can be independently controlled and can adaptively open the number of working layers according to the concentration of CO2 and H2S in the biogas. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model. DETAILED DESCRIPTION
[0018] In order to enable ordinary technicians in the field to more clearly understand the purpose, technical solutions and advantages of the utility model, the utility model is further explained below in conjunction with the accompanying drawings and embodiments.
[0019] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "horizontal" and "vertical" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention. They do not indicate or imply that the device or component referred to must have a specific direction and therefore should not be understood as a limitation on the present invention.
[0020] The utility model will be described in detail below with reference to the accompanying drawings: Figure 1 As shown, a device for comprehensively treating anaerobic biogas from a sewage station is provided, the device comprising an MDEA desulfurization and decarbonization tower 1, a lean liquid regeneration tower 9, a lean liquid tank 5, a rich liquid tank 3, an air preheater 7, and a lean and rich liquid heat exchanger 6. An anaerobic biogas inlet channel is provided at one end of the MDEA desulfurization and decarbonization tower 1, a gas phase channel 20 is provided above the MDEA desulfurization and decarbonization tower 1, and a liquid phase channel 21 is provided at the bottom, wherein the liquid phase channel 21 is connected to the rich liquid tank 3, and the gas phase channel is connected to a drying tower 12. Two pipelines are provided at the rear of the drying tower 12, one of which is connected to a compressor 13 and an odorizing One route is connected to the machine 14, and after being compressed by the compressor 13 and odorized by the odorizer 14, it is incorporated into the municipal natural gas pipeline network for sale. The other route is evenly mixed with the fresh air heated by the air preheater 7 and then led to the gas boiler 8 for combustion. After combustion, hot steam and high-temperature flue gas are generated, wherein the hot steam is used as a heat source for heating and bathing in the village households, and the high-temperature flue gas enters the lean liquid regeneration tower 9 to provide the required heat for the regeneration of the MDEA desulfurization and decarbonization tower. Finally, the flue gas coming out of the MDEA desulfurization and decarbonization tower is discharged to the outside through the air preheater. In the air preheater, the heat of the flue gas is used as a heat source for heating the above-mentioned fresh air.
[0021] The utility model realizes the cascade resource utilization of low-grade thermal energy through designs of lean-rich liquid heat exchangers, air preheaters, etc.
[0022] The lean liquid regeneration tower 9 is connected to the lean liquid tank 5 and the rich liquid tank 3 respectively through the lean and rich liquid heat exchanger 6. The lean liquid tank 5 is also connected to the MDEA desulfurization and decarbonization tower 1 for reflux, and an electric valve 4 is arranged on the connecting pipeline. A circulating pipeline 22 with a circulating pump 2 is also opened between the bottom and the top of the MDEA desulfurization and decarbonization tower to reflux the liquid at the bottom to the top of the tower.
[0023] The lean liquid regeneration tower 9 is composed of an insulation layer 23 and a lean liquid regeneration space layer 24, wherein the high-temperature flue gas generated by the gas boiler 8 flows into the insulation layer 23 for insulation, and a pipe 25 with a sprinkler head is installed above the lean liquid regeneration space layer 24. The pipe passes through the lean-rich liquid heat exchanger 6 to flow the rich liquid in the rich liquid tank 3 into the lean liquid regeneration tower 9. A liquid outlet 26 is opened at the bottom of the lean liquid regeneration tower 9. The liquid outlet 26 is connected to the lean-rich liquid heat exchanger 6 through a liquid outlet pipe, and the lean liquid flows into the lean liquid tank 5 through the lean-rich liquid heat exchanger 6.
[0024] The lean liquid regeneration space layer in the middle of the lean liquid regeneration tower 9 is equipped with a plurality of baffles 27 inclined downward. The baffles 27 are arranged relative to and crosswise to form a plurality of S-shaped flow channels 28 in the entire lean liquid regeneration space layer, thereby extending the residence time of the rich liquid in the regeneration tower while fully increasing the disturbance, improving the molecular Brownian motion, and ensuring the full regeneration reaction from rich liquid to lean liquid. The baffles have a self-cleaning effect, and rely on the repeated flushing of the solution from high to low to avoid the deposition of impurities.
[0025] The utility model of the lean liquid regeneration tower includes two layers of hard isolation structure and a middle flue gas channel, wherein the outer layer is a heat preservation layer, the inner layer is a lean liquid regeneration space, and the middle layer is a high-temperature flue gas channel. A baffle with a certain slope is designed on the inner lean liquid regeneration space structure, which serves to extend the residence time of the rich liquid in the regeneration tower, fully increase the disturbance, improve the molecular Brownian motion, and ensure the full regeneration reaction from rich liquid to lean liquid. The inclined baffle has a self-cleaning effect, and relies on the repeated flushing of the solution from high to low to avoid the deposition of impurities, and the maintenance cost is low.
[0026] The insulation layer of the lean liquid regeneration tower 9 is provided with a plurality of hot flue gas distribution ports 10, through which the hot flue gas is fully arranged in the insulation layer to achieve the insulation of the lean liquid regeneration tower 9. The lean liquid regeneration tower in the utility model is designed with a plurality of hot flue gas distribution ports to ensure uniform temperature inside the regeneration tower, and then the flue gas from the MDEA desulfurization and decarbonization tower is discharged to the outside through the air preheater, in which the heat of the flue gas is used as the heat source for the above-mentioned fresh air heating, realizing the preheating step utilization.
[0027] A method for using an anaerobic biogas device in a comprehensive sewage treatment station, the method being as follows:
[0028] The anaerobic biogas enters the bottom of the MDEA desulfurization and decarbonization tower 1 and passes through the absorption tower from bottom to top; the solution after complete regeneration is a lean liquid, which is pumped from the lean liquid tank 5 to the upper part of the absorption tower, passes through the absorption tower from top to bottom, is collected at the bottom of the absorption tower, and is sent to the upper part of the absorption tower through the circulation pump 2; the counter-flowing solution and the low-pressure biogas are fully contacted in the absorption tower, and the CO2 and H2S in the biogas are absorbed and enter the liquid phase, and the other components that are not absorbed are drawn out from the top of the absorption tower, enter the drying tower 12 for dehydration, and are divided into two paths, one of which is compressed by the compressor 13 and odorized by the odorizer 14, and then is included in the municipal natural gas pipeline network for sale, and the other is evenly mixed with the fresh air heated by the air preheater 7. Mixed with gas boiler 8 for combustion, the hot steam generated by combustion is used as heating source for village households and bathing, etc. The high-temperature flue gas generated is evenly dispersed to flue gas channel 11 through hot flue gas distribution port 10 as heat source for lean liquid regeneration tower 9, and then enters air preheater 7 to heat air for use. The solution continuously absorbs CO2 and H2S in biogas and becomes rich liquid, which is discharged from the bottom of the absorption tower to rich liquid tank 3 at regular intervals. After being heated by lean-rich liquid heat exchanger 6, it enters the upper part of lean liquid regeneration tower 9 for heating and regeneration. During the regeneration process, acidic gas sulfide is generated, which is discharged from the top of the regeneration tower, desulfurized by desulfurization tank 15 and emptied. Lean liquid is drawn out from the bottom of the lean liquid regeneration tower, and the lean liquid passes through lean-rich liquid heat exchanger 6 and reaches lean liquid tank 5. The MDEA desulfurization and decarbonization tower 1 is built with three spray layers, each of which is provided with an independent packing tower, which can be opened simultaneously or individually by valve control.
[0029] The entire process of the utility model has no external energy input. Through gas boiler heating and natural gas sales, while realizing the high-value resource utilization of sewage anaerobic biogas, the cascade utilization of energy is achieved, and the high-temperature flue gas is used as the heat source of the regeneration tower and the air preheater. After the rural sewage anaerobic biogas of the utility model is treated by this process, high-value natural gas and steam that can be used as a heat source for bathing, etc. are generated, avoiding the direct use of biogas, protecting the physical and mental health of villagers, and greatly reducing the impact on the environment.
[0030] The specific embodiments described herein are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.
Claims
1. A device for comprehensive treatment of anaerobic biogas from sewage stations, characterized in that: The device is composed of an MDEA desulfurization and decarbonization tower, a lean liquid regeneration tower, a lean liquid tank, a rich liquid tank, an air preheater, and a lean and rich liquid heat exchanger. An anaerobic biogas inlet channel is provided at one end of the MDEA desulfurization and decarbonization tower, a gas phase channel is provided above the MDEA desulfurization and decarbonization tower, and a liquid phase channel is provided at the bottom, wherein the liquid phase channel is connected to the rich liquid tank, and the gas phase channel is connected to the drying tower. Two pipelines are provided at the rear of the drying tower, one of which is connected to a compressor and an odorizer, and is compressed by the compressor and odorized by the odorizer before being introduced into the municipal natural gas. The gas is sold outside the gas pipeline network, and the other route is evenly mixed with the fresh air heated by the air preheater and then sent to the gas boiler for combustion. After combustion, hot steam and high-temperature flue gas are generated. The hot steam is used as a heat source for heating and bathing in villages, and the high-temperature flue gas enters the lean liquid regeneration tower. The high-temperature flue gas enters the lean liquid regeneration tower to provide the required heat for the regeneration of the MDEA desulfurization and decarbonization tower. Finally, the flue gas coming out of the MDEA desulfurization and decarbonization tower is discharged to the outside through the air preheater. In the air preheater, the heat of the flue gas is used as the heat source for heating the above-mentioned fresh air.
2. The device for comprehensive treatment of anaerobic biogas in sewage station according to claim 1, characterized in that: The lean liquid regeneration tower is connected to the lean liquid tank and the rich liquid tank respectively through lean and rich liquid heat exchangers. The lean liquid tank is also connected to the MDEA desulfurization and decarbonization tower for reflux. A circulating pipeline with a circulating pump is also opened between the bottom and the top of the MDEA desulfurization and decarbonization tower to reflux the liquid at the bottom to the top of the tower.
3. The device for comprehensive treatment of anaerobic biogas in sewage station according to claim 2, characterized in that: The lean liquid regeneration tower consists of an insulation layer and a lean liquid regeneration space layer, wherein the high-temperature flue gas generated by the gas boiler flowing into the insulation layer enters the lean liquid regeneration tower to provide the required heat for MDEA regeneration, and a pipe with a sprinkler head is installed above the lean liquid regeneration space layer. The pipe passes through a lean-rich liquid heat exchanger to flow the rich liquid in the rich liquid tank into the lean liquid regeneration tower. A liquid outlet is opened at the bottom of the lean liquid regeneration tower, and the liquid outlet is connected to the lean-rich liquid heat exchanger through a liquid outlet pipe, so that the lean liquid flows into the lean liquid tank through the lean-rich liquid heat exchanger.
4. The device for comprehensive treatment of anaerobic biogas in sewage station according to claim 3, characterized in that: A plurality of baffles inclined downward are installed in the lean liquid regeneration space layer in the middle of the lean liquid regeneration tower. The baffles are arranged oppositely and crosswise, so that a plurality of S-shaped flow channels are formed in the entire lean liquid regeneration space layer, so that the residence time of the rich liquid in the regeneration tower is prolonged, the disturbance is fully increased, the molecular Brownian motion is improved, and the regeneration reaction from the rich liquid to the lean liquid is fully carried out. In addition, the baffles have a self-cleaning function, and the deposition of impurities is avoided by repeatedly flushing the solution from high to low.
5. The device for comprehensive treatment of anaerobic biogas in sewage station according to claim 4, characterized in that: A plurality of hot flue gas distribution openings are provided on the insulation layer of the lean liquid regeneration tower, and the hot flue gas is fully arranged in the insulation layer through the plurality of hot flue gas distribution openings to achieve insulation of the lean liquid regeneration tower.