A waste gas purification mechanism for biogas power generation
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-05
- Publication Date
- 2026-08-14
AI Technical Summary
[0004]本申请通过提供一种沼气发电的废气净化机构，解决了现有技术中废气进入药液后易形成大气泡，且缺乏对废气中颗粒物的有效拦截机制的技术问题；实现了废气进入药液后不易形成大气泡，且能够对废气中颗粒物进行拦截的技术效果
通过净化罐、输气主管、输气支管及内置条的结构协同实现废气净化；净化罐内储存净化药液，底部设排液管；竖直设置的输气主管顶端伸出罐外；多个输气支管一端与主管连通，另一端伸出罐外并设密封管盖，支管内部填充海绵或纤维棉制成的内置条，管壁开设出气孔；废气经主管进入支管后，通过出气孔分散为微小气泡，内置条的多孔结构吸附颗粒物并延长气体与药液的接触时间，促进气液充分混合反应；解决了现有技术中废气进入药液后易形成大气泡，且缺乏对废气中颗粒物的有效拦截机制的技术问题；实现了废气进入药液后不易形成大气泡，且能够对废气中颗粒物进行拦截的技术效果。
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Figure CN224628756U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of waste gas purification technology, and in particular to a waste gas purification mechanism for biogas power generation. Background Technology
[0002] Biogas power generation, as an important component of biomass energy utilization, produces exhaust gases containing a complex variety of pollutants, including common nitrogen oxides (NOx). x In addition to sulfides (SO2, H2S), particulate matter (PM2.5 to PM10), and volatile organic compounds (VOCs), this type of waste gas may also include ammonia (NH3), carbon monoxide (CO), and odorous substances. Direct emission of these components will cause multiple harms to the atmospheric environment and human health. Currently, chemical absorption has become one of the mainstream processes for purifying this type of waste gas due to its strong applicability, stable operation, and high treatment efficiency. It typically uses alkaline absorbents (such as NaOH, Ca(OH)2, etc.) to remove acidic gases, combined with oxidizing agents (such as sodium hypochlorite) to degrade VOCs and some difficult-to-treat sulfides, and can be combined with spray washing to achieve preliminary removal of particulate matter. With increasingly stringent environmental protection requirements and continuous process optimization, this technology is also often used in combination with other purification units such as biological filters, activated carbon adsorption, or catalytic oxidation devices to address more complex waste gas compositions and improve the overall purification efficiency of the system, thereby meeting increasingly stringent emission standards.
[0003] However, traditional liquid drug absorption devices have significant technical bottlenecks: On the one hand, most devices adopt a single-pipe vertical air inlet structure (such as spray towers or bubble towers), where exhaust gas enters the liquid drug through a single path, easily forming large bubbles with a diameter of 5 to 10 cm, resulting in insufficient contact area between the gas and the liquid drug and low reaction efficiency; on the other hand, existing devices lack an effective interception mechanism for solid particulate matter, and relying solely on liquid drug flushing is insufficient to remove dust particles with a diameter of less than 10 μm, and the residence time of gas in the liquid drug is usually less than 3 seconds, making it difficult to meet the requirements for deep purification (such as NO). x The removal rate needs to reach over 80%. To meet emission standards, companies often need to connect multiple stages of purification equipment in series (such as first spraying with alkaline solution and then adsorbing with activated carbon), which increases the system's footprint and operating costs (chemical consumption, energy consumption). Utility Model Content
[0004] This application provides a waste gas purification mechanism for biogas power generation, which solves the technical problems in the prior art where waste gas easily forms large bubbles after entering the liquid medicine and lacks an effective interception mechanism for particulate matter in the waste gas; it achieves the technical effect that waste gas does not easily form large bubbles after entering the liquid medicine and can intercept particulate matter in the waste gas.
[0005] This application provides a waste gas purification mechanism for biogas power generation, including a purification tank, a main gas supply pipe, and branch gas supply pipes; a support assembly is provided at the bottom of the purification tank; the main gas supply pipe is vertically installed on the inner wall of the purification tank, with its top end extending out of the purification tank and its bottom end closed; the branch gas supply pipes are installed inside the purification tank, with one end connected to the main gas supply pipe and the other end extending out of the purification tank, and a pipe cap is provided at the end of the branch gas supply pipe extending out of the purification tank; multiple air outlets are provided on the branch gas supply pipes, and an internal strip is installed inside the branch gas supply pipes; an air outlet pipe is provided at the top of the purification tank; the purification tank stores purification liquid, and the air inlet of the main gas supply pipe is higher than the water level of the purification liquid.
[0006] Preferably, the built-in strip may be made of sponge or fiber cotton.
[0007] Preferably, there are multiple gas supply branches, which can be distributed vertically.
[0008] Preferably, the waste gas purification mechanism for biogas power generation in this application further includes a circulating spray assembly, which includes a circulating pump, a circulating pipe, and multiple atomizing nozzles; the circulating pump is installed at the bottom of the purification tank, and the bottom of the circulating pipe is connected to the circulating pump; the multiple atomizing nozzles are arranged at the top of the circulating pipe, and the atomizing nozzles are located above the water surface of the purification solution.
[0009] Preferably, the top of the air outlet pipe is connected to the outside of the purification tank, and the bottom of the air outlet pipe is located on the spray outlet side of the atomizing nozzle.
[0010] Preferably, the distance between the bottom of the air outlet pipe and the atomizing nozzle is no more than 50 cm.
[0011] One or more technical solutions provided in this application have at least the following technical effects or advantages: The system employs a synergistic structure of a purification tank, main gas supply pipe, branch gas supply pipes, and built-in strips to purify waste gas. The purification tank stores the purifying solution and has a drain pipe at the bottom. The vertically positioned main gas supply pipe extends beyond the tank at its top. Multiple branch gas supply pipes connect to the main pipe at one end and extend beyond the tank at the other, each with a sealed cap. The branch pipes are filled with built-in strips made of sponge or fiber cotton, and have vent holes in their walls. After entering the branch pipes from the main pipe, the waste gas disperses into tiny bubbles through the vent holes. The porous structure of the built-in strips adsorbs particulate matter and prolongs the contact time between the gas and the purifying solution, promoting thorough gas-liquid mixing. This system solves the technical problems of existing technologies where waste gas easily forms large bubbles after entering the purifying solution and lacks an effective interception mechanism for particulate matter in the waste gas. It achieves the technical effect of preventing the formation of large bubbles after waste gas enters the purifying solution and effectively intercepting particulate matter in the waste gas. Attached Figure Description
[0012] Figure 1This is a schematic diagram of the overall structure of the waste gas purification mechanism for biogas power generation of this utility model. Figure 2 This is a schematic diagram of the gas transmission branch pipe structure of the waste gas purification mechanism for biogas power generation of this utility model. Figure 3 This is a schematic diagram of the circulating spray assembly structure of the waste gas purification mechanism for biogas power generation of this utility model. Figure 4 This is a schematic diagram showing the location of the exhaust pipe of the waste gas purification mechanism for biogas power generation according to this utility model.
[0013] In the diagram: 10. Purification tank; 11. Support assembly; 12. Drain pipe; 13. Gas outlet pipe; 20. Main gas supply pipe; 30. Branch gas supply pipe; 31. Pipe cover; 32. Gas outlet; 33. Internal strip; 40. Circulating spray assembly; 41. Circulating pump; 42. Circulating pipe; 43. Atomizing nozzle. Detailed Implementation
[0014] To facilitate understanding of this utility model, a more comprehensive description of this application will be given below with reference to the accompanying drawings, which show preferred embodiments of the utility model. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of this utility model.
[0015] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.
[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0017] Example: Figures 1 to 4 As shown, the exhaust gas purification mechanism for biogas power generation in this application includes a purification tank 10, a main gas transmission pipe 20, a branch gas transmission pipe 30, a power assembly, and a control unit.
[0018] A support component 11 is provided at the bottom of the purification tank 10.
[0019] The gas transmission main pipe 20 is vertically installed on the inner wall of the purification tank 10, and the top of the gas transmission main pipe 20 extends out of the purification tank 10.
[0020] The bottom of the gas transmission main pipe 20 is sealed.
[0021] The gas supply branch pipe 30 is installed inside the purification tank 10. One end of the gas supply branch pipe 30 is connected to the gas supply main pipe 20, and the other end of the gas supply branch pipe 30 extends out of the purification tank 10. A pipe cap 31 is provided at the end of the gas supply branch pipe 30 that extends out of the purification tank 10.
[0022] Optionally, the number of gas transmission branch pipes 30 can be multiple, such as 2 to 5; multiple gas transmission branch pipes 30 can be distributed vertically.
[0023] An air outlet pipe 13 is provided on the top of the purification tank 10.
[0024] It should be noted that the gas supply branch pipe 30 can pass through the axis of the purification tank 10. At this time, the part of the gas supply branch pipe 30 inside the purification tank 10 is relatively long; the pipe cover 31 is located outside the purification tank 10, and the pipe cover 31 and the gas supply branch pipe 30 can be connected by a sealed thread (through a sealing gasket or sealing ring).
[0025] The gas supply branch pipe 30 has multiple air outlets 32, and an internal strip 33 is installed inside the gas supply branch pipe 30.
[0026] The built-in strip 33 can be made of sponge or fiber cotton.
[0027] It should be noted that there can be 20 to 40 air vents 32. The specific number and distribution of air vents 32 can be selected according to actual needs, which will not be elaborated here.
[0028] Optionally, the diameter of the vent 32 can be 2 cm to 5 cm.
[0029] The purification tank 10 contains purification solution, and the air inlet of the gas supply pipe 20 is higher than the water level of the purification solution.
[0030] The bottom of the purification tank 10 is connected to a drain pipe 12, and a valve is installed on the drain pipe 12.
[0031] The power unit is used to supply power for the operation of the exhaust gas purification mechanism, preferably an AC power supply or a battery; the control unit is used to control the coordinated operation of the various components of the exhaust gas purification mechanism, preferably a programmable logic controller; both are existing technologies and will not be described in detail here.
[0032] It should be noted that the waste gas after biogas power generation can first undergo waste heat recovery (temperature reduction) and then be sent to the purification tank 10 for purification through the gas transmission main pipe 20 via a gas pumping device (such as a gas pump or blower, not shown in the figure).
[0033] Optionally, in this application, the purification liquid can be injected into the purification tank 10 through the vent pipe 13, or the purification liquid can be injected into the purification tank 10 through a dedicated drug delivery pump (not shown in the figure) and drug delivery pipeline (not shown in the figure). The drug delivery pipeline extends into the purification tank 10, and the other end of the drug delivery pipeline is connected to the purification liquid storage device (not shown in the figure). This drug delivery method and structure are existing technologies and will not be described in detail here.
[0034] Specifically, during actual operation, the staff checks whether the pipe cap 31 of the gas transmission branch pipe 30 is sealed (through threaded connection and sealing gasket / ring); injects an appropriate amount of purification solution into the purification tank 10 (observing the sealing of the pipe cap 31 during the injection process), ensuring that the liquid level is lower than the air inlet of the main gas transmission pipe 20 to prevent backflow of the solution, and that the built-in strip 33 is soaked in the purification solution; confirms that the built-in strip 33 (sponge / fiber cotton) has been filled into the gas transmission branch pipe 30; the exhaust gas after biogas power generation is first cooled by a waste heat recovery device (such as a heat exchanger), and then pumped by a gas pump (air pump / fan) to circulate the exhaust gas. The gas enters the purification tank 10 through the main gas supply pipe 20; the waste gas enters each gas supply branch pipe 30 from the main gas supply pipe 20, and disperses into the liquid medicine in the form of small bubbles through multiple air outlets 32 on the gas supply branch pipe 30; the built-in strip 33 (sponge / fiber cotton) adsorbs particulate matter in the waste gas through its porous structure and prolongs the contact time between the gas and the liquid medicine, promoting full mixing and reaction; after the gas purification is completed, the waste liquid can be discharged through the drain pipe 12, and fresh liquid medicine can be injected after the valve is closed; when replacing the built-in strip 33, open the pipe cover 31, take out the old built-in strip 33, clean the gas supply branch pipe 30, install the new built-in strip 33, and reseal the pipe cover 31.
[0035] It should be noted that the purification solution in this embodiment is selected according to the composition of the waste gas to be purified, such as a solution for removing nitrogen oxides (ammonia or urea solution), or a solution for desulfurization and removal of other acidic gases (sodium hydroxide solution or sodium hypochlorite solution). At the same time, multiple waste gas purification units of this application can be set up, and different purification solutions are used in multiple waste gas purification units to purify different components in the waste gas. The specific selection of purification solution is prior art and will not be described in detail here.
[0036] Understandably, the multiple air outlets 32 of the gas supply branch pipe 30 disperse the exhaust gas into tiny bubbles, increasing the contact area between the gas and the liquid medicine; the porous structure of the built-in strip 33 (sponge / fiber cotton) further adsorbs the bubbles, prolonging the residence time of the gas in the liquid medicine and ensuring a full reaction; the fibrous structure of the built-in strip 33 can intercept particulate matter (such as smoke and dust, and incompletely burned organic matter) in the exhaust gas, achieving physical filtration; the moist surface of the sponge / fiber cotton further adsorbs gaseous pollutants, improving purification efficiency.
[0037] like Figure 1 , Figure 3 and Figure 4 As shown, in another embodiment of this application, the exhaust gas purification mechanism for biogas power generation further includes a circulating spray assembly 40, which includes a circulating pump 41, a circulating pipe 42, and a plurality of atomizing nozzles 43.
[0038] The circulation pump 41 is installed at the bottom inside the purification tank 10, and the bottom of the circulation pipe 42 is connected to the circulation pump 41.
[0039] Multiple atomizing nozzles 43 are arranged at the top of the circulation pipe 42, and the atomizing nozzles 43 are located above the water surface of the purified medicine solution.
[0040] It should be noted that the multiple atomizing nozzles 43 can be 3, 4, 5, or 6, etc. The specific number and location distribution are selected according to actual needs, and will not be elaborated here.
[0041] It should be noted that the circulation pump 41 in this embodiment is a water pump, and the outlet of the circulation pump 41 is connected to the circulation pipe 42. The inlet of the circulation pipe 42 is located at the bottom, and a filter screen (not shown in the figure) can be installed at the inlet of the circulation pipe 42.
[0042] Optionally, the top of the air outlet pipe 13 is connected to the outside of the purification tank 10, and the bottom of the air outlet pipe 13 is located on the spray outlet side of the atomizing nozzle 43.
[0043] It should be noted that the distance between the bottom of the air outlet pipe 13 and the atomizing nozzle 43 may not exceed 50 cm, so that the gas discharged from the air outlet pipe 13 can fully contact the atomized purification liquid.
[0044] Additionally, if there are further processing procedures, the gas discharged through the exhaust pipe 13 can enter the subsequent processing procedures through the supply pipe (not shown in the figure), and the supply pipe is connected to the exhaust pipe 13.
[0045] Specifically, during actual operation, the staff starts the circulation pump 41, which pumps the liquid medicine at the bottom of the purification tank 10 to the top through the circulation pipe 42. The liquid medicine is atomized by multiple atomizing nozzles 43 (3 to 6) and sprayed out, forming fine droplets that are suspended inside the purification tank 10. After the biogas exhaust gas is recovered from waste heat, it enters the gas supply branch pipe 30 through the gas supply main pipe 20, and is dispersed into bubbles through the gas outlet 32 to react initially with the liquid medicine. At the same time, the atomizing nozzles 43 continuously spray the liquid medicine, covering the upper space of the purification tank 10 to form a dual purification mechanism. Primary purification: Waste gas is dispersed by bubbles through the gas delivery branch pipe 30 and reacts with the liquid medicine, while the built-in strip 33 adsorbs particulate matter; Secondary purification: Unreacted gas rises to the atomization area, comes into contact with the atomized droplets again, and further absorbs residual pollutants.
[0046] The purified gas is discharged through the outlet pipe 13, the bottom opening of which is close to the atomizing nozzle 43 (distance ≤ 50cm) to ensure that the gas is fully mixed with the atomized droplets before being discharged; the inlet filter of the circulation pump 41 is cleaned regularly to prevent impurities in the liquid from clogging it; the atomizing nozzle 43 is checked regularly for blockage, and can be disassembled for cleaning or replacement.
[0047] It should be noted that a maintenance door (not shown in the figure) can be provided on the side wall of the purification tank 10. The maintenance door is used to facilitate cleaning or maintenance by relevant personnel. The maintenance door can be sealed on the purification tank 10 by means of a sealing strip, and the water level of the purification solution can be lower than the maintenance door. This is existing technology and will not be described in detail here.
[0048] Understandably, the bottom of the air outlet pipe 13 is close to the atomization area, and the upward force of the gas and the falling droplets form convection to prolong the contact time and ensure a full reaction; the circulating spray assembly 40 continuously transports the liquid from the bottom to the top spray to maintain the uniformity of the liquid concentration and avoid local liquid failure (such as a drop in pH value).
[0049] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. For those skilled in the art, various modifications and variations are possible with this utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A waste gas purification mechanism for biogas power generation, comprising a purification tank (10), a main gas transmission pipe (20), and a branch gas transmission pipe (30). The bottom of the purification tank (10) is provided with a support component (11). Its features are, The gas transmission pipe (20) is vertically installed on the inner wall of the purification tank (10), and the top end of the gas transmission pipe (20) extends out of the purification tank (10), while the bottom end of the gas transmission pipe (20) is closed. The gas supply branch pipe (30) is installed inside the purification tank (10). One end of the gas supply branch pipe (30) is connected to the gas supply main pipe (20), and the other end of the gas supply branch pipe (30) extends out of the purification tank (10). A pipe cap (31) is provided at the end of the gas supply branch pipe (30) that extends out of the purification tank (10). The gas supply branch pipe (30) is provided with multiple air outlets (32), and an internal strip (33) is installed inside the gas supply branch pipe (30). The top of the purification tank (10) is provided with an air outlet pipe (13). The purification tank (10) contains purification liquid, and the air inlet of the gas supply pipe (20) is higher than the water surface of the purification liquid.
2. The waste gas purification mechanism for biogas power generation as described in claim 1, characterized in that, The built-in strip (33) may be made of sponge or fiber cotton.
3. The waste gas purification mechanism for biogas power generation as described in claim 1, characterized in that, The number of gas supply branch pipes (30) is multiple, and the multiple gas supply branch pipes (30) can be distributed vertically.
4. The waste gas purification mechanism for biogas power generation as described in claim 1, characterized in that, It also includes a circulating spray assembly (40), which includes a circulating pump (41), a circulating pipe (42) and multiple atomizing nozzles (43). The circulation pump (41) is installed at the bottom inside the purification tank (10), and the bottom of the circulation pipe (42) is connected to the circulation pump (41); Multiple atomizing nozzles (43) are set at the top of the circulation pipe (42), and the atomizing nozzles (43) are located above the water surface of the purified medicine solution.
5. The waste gas purification mechanism for biogas power generation as described in claim 4, characterized in that, The top of the air outlet pipe (13) is connected to the outside of the purification tank (10), and the bottom of the air outlet pipe (13) is located on the side of the nozzle outlet of the atomizing nozzle (43).
6. The waste gas purification mechanism for biogas power generation as described in claim 5, characterized in that, The distance between the bottom of the air outlet pipe (13) and the atomizing nozzle (43) is no more than 50 cm.