Biogas water sealing and gas-water separation integrated equipment and method

Abstract

The invention relates to biogas water sealing and gas-water separation integrated equipment and method, the biogas water sealing and gas-water separation integrated equipment comprises a gas-water separation zone and a water sealing zone which are arranged in the same cylinder, and the water sealing zone is arranged below the gas-water separation zone; a communicating pipe is arranged in the barrel body, one end of the communicating pipe is communicated with the gas-water separation area, and the other end of the communicating pipe extends to the position below the water seal liquid level in the water seal area and is close to a bottom plate of the water seal area; a communicating pipeline is further arranged on the side wall, located above the water seal liquid level, of the water seal area, and the end, away from the water seal area, of the communicating pipeline extends into the gas-water separation area. The integrated device has the beneficial effects that biogas water sealing and gas-water separation are integrated on one integrated device, so that the integrated design of water sealing and gas-water separation functions is realized, the occupied area is reduced, the layout and installation of equipment such as pipelines between a water sealing area and a gas-water separation area are simplified, and the cost is reduced. The integrated design reduces the risk of methane leakage.

Description

Technical Field

[0001] The present invention relates to the technical field of biogas treatment, and particularly to an integrated device and method for biogas water seal and gas-water separation. Background Technique

[0002] Anaerobic fermentation processes are commonly used in scenarios such as treating high-concentration organic wastewater, food waste, livestock manure, and municipal sludge. While removing a large amount of organic pollutants, they can produce clean energy - biogas. Therefore, they have multiple advantages such as energy, environmental protection, and low carbon, and are widely used at home and abroad. The main component of biogas produced by anaerobic fermentation processes is methane gas, accounting for about 50% - 60% of the biogas volume. After treatment, it can be used as biomethane for power generation, vehicle fuel, civil gas, etc. As a new biomass energy source, it makes a great contribution to carbon emission reduction while replacing primary energy. Among them, the safe utilization of biogas covers multiple technical links. In Clause 7.4.9 of "Technical Specification for Biogas Engineering - Part 1: Engineering Design" (NY / T 1220.1 - 2019), it is clearly required that after biogas escapes from the anaerobic reactor, it must first pass through a water seal device to ensure proper treatment before purification. In addition, since biogas contains H 2 S gas, on the one hand, H 2 S gas is a toxic gas; on the other hand, when biogas contains water, it is very easy to cause serious corrosion to subsequent facilities such as pipelines, biogas flares, and biogas generators. Therefore, biogas must be subjected to gas-water separation treatment after passing through the water seal tank. It can be seen that the water seal and gas-water separation processes play a crucial role in the process of biogas utilization. They are not only barriers for isolation and fire prevention, but also play a decisive role in the stable operation of reactors and biogas utilization equipment.

[0003] During the operation of biogas projects, water seal tanks and gas-water separators are two common treatment devices in biogas projects, but they have the following disadvantages:

[0004] 1. The water level of the water seal tank must be checked every day, and manual water replenishment or drainage of the excess water in the water seal tank due to gas-water separation is required to maintain the stability of the liquid level in the water seal tank. When the liquid level is unstable, positive pressure or negative pressure will be generated, affecting the normal operation of the anaerobic fermentation tank, and seriously endangering the operation safety in severe cases.

[0005] 2. Between the biogas outlet of the anaerobic tank and the biogas terminal utilization facilities, necessary devices such as a water seal tank, a gas-water separator, and a desulfurization tank are required. Due to the large number of devices, long process, high management difficulty, and involving a large number of pipeline installations, interfaces, valves, etc., the longer the operation time, the greater the risk of biogas leakage. An integrated solution with a simple structure, stable operation, and high degree of automation is needed. Currently, there are few devices that integrate the functions of water seal and gas-water separation.

[0006] 3. The conventional gas-water separator is equipped with a steam trap at the bottom. However, the biogas often contains suspended impurities. When the impurities enter the gas-water separator along with the biogas, it is very easy to cause the steam trap to be blocked, resulting in poor operation and high maintenance costs. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide an integrated device and method for biogas water seal and gas-water separation, which realizes the integrated design of the water seal and gas-water separation functions, can automatically maintain a constant water seal liquid level, automatically discharge the water separated by gas-water separation, and has positive and negative pressure protection functions at the same time.

[0008] The technical solution of the present invention to solve the above technical problems is as follows: An integrated device for biogas water seal and gas-water separation, comprising: a gas-water separation area and a water seal area arranged in the same cylinder body, and the water seal area is arranged below the gas-water separation area;

[0009] A connecting pipe is arranged in the cylinder body. One end of the connecting pipe communicates with the gas-water separation area, and the other end of the connecting pipe extends below the water seal liquid level in the water seal area and is arranged close to the bottom plate of the water seal area;

[0010] A connecting pipeline is also arranged on the side wall of the water seal area above the water seal liquid level. The end of the connecting pipeline away from the water seal area extends into the interior of the gas-water separation area.

[0011] The beneficial effects of the present invention are: By integrating the biogas water seal and gas-water separation into an integrated device, the integrated design of the water seal and gas-water separation functions is realized, reducing the floor area, and also simplifying the layout and installation of pipelines and other equipment between the water seal area and the gas-water separation area. The integrated design reduces the risk of biogas leakage; at the same time, the gas-water separation area is arranged above the water seal area, so that the separated water generated after gas-water separation can be automatically discharged into the water seal area, and the biogas after water seal can also be introduced into the gas-water separation area through the connecting pipeline; and the structure of this device is simple, without electrical equipment, which can reduce the floor area, reduce pipeline installation, and has extremely low operation and management difficulty.

[0012] On the basis of the above technical solution, the present invention can be further improved as follows.

[0013] Further, the gas-water separation area and the water seal area are separated by a partition board;

[0014] The connecting pipe is arranged at the central position of the partition board, and the end of the connecting pipe is arranged at an interval from the bottom plate of the water seal area. The connecting pipe is used to introduce the separated water generated after gas-water separation into the water seal area.

[0015] The beneficial effect of adopting the above further scheme is: the cylinder is divided into two areas, the gas-water separation area and the water seal area, by the partition, so that the division of equipment functions is clearer, and the setting of the connecting pipe allows the separated water generated after the gas-water separation of biogas to automatically flow into the water seal area through the connecting pipe, and drainage can be achieved without manual operation.

[0016] Furthermore, a biogas inlet pipe is provided through the side wall of the water seal area close to the gas-water separation area, and the biogas inlet pipe is located on one side of the water seal area and extends below the water seal liquid level of the water seal area.

[0017] The beneficial effect of adopting the above further scheme is: through the biogas inlet pipe as the biogas inlet of the device, the biogas enters below the water seal liquid level through the biogas inlet pipe and escapes from the water, thereby realizing the water seal effect.

[0018] Furthermore, the end of the biogas inlet pipe is arranged higher than the end of the connecting pipe, and the distance between the end of the biogas inlet pipe and the end of the connecting pipe is 5-10 cm.

[0019] The beneficial effect of adopting the above further solution is to prevent biogas from directly entering the gas-water separation zone from the connecting pipe.

[0020] Furthermore, a liquid level gauge is installed on the water seal area, and the liquid level gauge is used to indicate the water level of the water seal area;

[0021] A water pipe and a valve installed on the water pipe are arranged at the bottom of the water seal area, and the water pipe is used to introduce or discharge water into or out of the water seal area.

[0022] The beneficial effect of adopting the above further scheme is: the water level in the water seal area is indicated by the liquid level gauge, and the water pipe serves as the water inlet and outlet of the water seal area, which is used to fill the water seal into the water seal area at the initial stage of equipment operation, or to drain the water in the water seal area.

[0023] Furthermore, an overflow port is provided on the side wall of the water seal area, and a U-shaped tube is installed at one end of the overflow port away from the water seal area, and one end of the U-shaped tube away from the overflow port is connected to the atmosphere. The overflow port and the U-shaped tube are used to discharge excess water in the water seal area to keep the liquid level in the water seal area constant, thereby realizing positive and negative pressure protection.

[0024] The beneficial effect of adopting the above further scheme is that when the water separated from the gas-water separation area is discharged into the water seal area through the connecting pipe, the excess water will be discharged into the U-shaped pipe through the overflow port, and then discharged by gravity from the drain port of the U-shaped pipe, thereby automatically maintaining the water level in the water seal area at a constant state.

[0025] Furthermore, the overflow port is arranged at a height flush with the height of the water seal liquid level line in the water seal area;

[0026] Define the end of the U-shaped pipe facing away from the overflow port as the drain port, and the drain port and the overflow port are at the same height.

[0027] The beneficial effect of adopting the above further solution is: ensuring that the heights of the two straight pipe sections of the U-shaped pipe are the same.

[0028] Further, a biogas outlet is provided at the top of the gas-liquid separation area for discharging the biogas after water seal and gas-liquid separation;

[0029] The U-shaped pipe includes two straight pipe sections, and the height of the straight pipe section is:

[0030] h = a×P×10

[0031] In the formula, h is the height of the straight pipe section; a is a multiple, and the value range is 1.5 - 2; P is the absolute pressure of the biogas outlet.

[0032] The beneficial effect of adopting the above further solution is: discharging the biogas after water seal and gas-liquid separation through the biogas outlet; enabling the U-shaped pipe to also form a water seal for the biogas, avoiding biogas leakage from the U-shaped pipe, and improving the safety and reliability of the equipment.

[0033] Further, one end of the connecting pipe extending into the gas-liquid separation area is provided with a duckbill-shaped air outlet, a guide cylinder is provided at the top of the gas-liquid separation area corresponding to the biogas outlet, the guide cylinder is arranged vertically in the middle of the gas-liquid separation area, the guide cylinder is communicated with the biogas outlet, and one end of the guide cylinder facing away from the biogas outlet is open;

[0034] The duckbill-shaped air outlet is arranged eccentrically with respect to the central axis of the guide cylinder, and the guide cylinder is used to drive the biogas ejected from the duckbill-shaped air outlet to move spirally downward along the outer wall of the guide cylinder together to achieve gas-liquid separation.

[0035] The beneficial effect of adopting the above further solution is: the duckbill-shaped air outlet is more conducive to the ejection of biogas. Arranging the duckbill-shaped air outlet eccentrically with respect to the central axis of the guide cylinder and cooperating with the guide cylinder makes the ejected biogas more likely to form a spiral downward movement along the outer wall of the guide cylinder, making the movement path of the biogas longer. Under the dual action of centrifugal force and gravity, the water vapor in the biogas has enough time to form water droplets, so as to be effectively separated from the biogas, improving the efficiency of gas-liquid separation.

[0036] A biogas water seal and gas-liquid separation method is also disclosed, using the biogas water seal and gas-liquid separation integrated equipment as described above, and the steps are:

[0037] Water is introduced into the water seal area until the water in the water seal area enters the U-shaped pipe from the overflow port and fills the U-shaped pipe;

[0038] The biogas discharged from the anaerobic generator is introduced below the water seal liquid level in the water seal area, and the biogas escaping after water sealing enters the upper cavity above the water seal liquid level in the water seal area to complete water sealing;

[0039] The biogas after water sealing is introduced into the gas-liquid separation area through a connecting pipe. The biogas is sprayed towards the guide cylinder through the duckbill-shaped air outlet at the end of the connecting pipe. The guide cylinder makes the biogas move downward in a spiral shape along the outer wall of the guide cylinder, and gas-liquid separation is completed under the action of centrifugal force and gravity;

[0040] The water after gas-liquid separation flows into the water seal area through a connecting pipe. When the water level in the water seal area reaches the water seal liquid level line, the excess water is discharged through the overflow port and the U-shaped pipe; the biogas after gas-liquid separation enters the inside of the guide cylinder from below the guide cylinder and is discharged through the biogas outlet.

[0041] The beneficial effects of adopting the above further scheme are as follows: Based on the integrated equipment of biogas water sealing and gas-liquid separation, an integrated design of water sealing and gas-liquid separation functions is realized; through the guide cylinder and the duckbill-shaped air outlet, the biogas can move downward in a spiral shape along the outer wall of the guide cylinder after entering the gas-liquid separation area. Under the action of centrifugal force and gravity, the efficiency of gas-liquid separation is greatly improved, ensuring the high-purity output of biogas; the design of the water seal area enables the biogas to pass through underwater to achieve water sealing. Through the U-shaped pipe and the overflow port, the water level in the water seal area can be kept relatively stable. Since the gas-liquid separation area and the water seal area are connected by a connecting pipe and the air pressures in the two areas are the same, water can flow unidirectionally from the gas-liquid separation area into the water seal area, while the biogas will not flow reversely; the method is convenient, safe and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is the front view of an embodiment of the present invention;

[0043] Figure 2 It is the schematic diagram of the internal structure of an embodiment of the present invention;

[0044] Figure 3 It is the equipment operation example diagram of an embodiment of the present invention.

[0045] In the drawings, the list of components represented by each reference numeral is as follows:

[0046] 1. Gas-water separation area; 2. Water seal area; 1-1. Biogas outlet; 1-2. Draft tube; 1-3. Connecting pipe; 1-4. Duckbill-shaped outlet; 1-5. Partition board; 2-1. Biogas inlet pipe; 2-2. Connecting pipe; 2-3. Liquid level gauge; 2-4. Water pipe; 2-5. Valve; 2-6. Overflow port; 3-1. U-shaped pipe; 3-2. Drainage port. Specific implementation mode

[0047] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0048] In the first aspect, as Figure 1-2 shown, the present invention discloses an integrated device for biogas water seal and gas-water separation, specifically including: a gas-water separation area 1 and a water seal area 2 arranged in the same cylinder body. The overall device is a cylindrical structure, divided into upper and lower cylinder bodies. The upper cylinder body is the gas-water separation area 1, and the lower cylinder body is the water seal area 2, that is, the water seal area 2 is arranged below the gas-water separation area 1. In this embodiment, the material of the cylinder body can be, but is not limited to, stainless steel or fiberglass, and will not be limited here.

[0049] As Figure 2 shown, a connecting pipe 2-2 connecting the gas-water separation area 1 and the water seal area 2 is also arranged in the cylinder body. One end of the connecting pipe 2-2 located in the water seal area 2 extends to below the water seal liquid level in the water seal area 2 and is arranged close to the bottom plate of the water seal area 2, so that the separated water generated after the biogas is separated by gas-water separation flows into the water seal area 2 through the connecting pipe 2-2, realizing the automatic discharge of the separated water after gas-water separation. At the same time, a connecting pipe 1-3 connecting the water seal area 2 and the gas-water separation area 1 is also arranged on the side wall of the cylinder body. One end of the connecting pipe 1-3 is connected to the side wall of the water seal area 2 above the water seal liquid level, and the other end of the connecting pipe 1-3 penetrates the side wall of the gas-water separation area 1 and extends to the inside of the gas-water separation area 1. The upper part of the water seal area 2 is connected to the gas-water separation area through the connecting pipe 1-3, so that the biogas after water seal can easily enter the gas-water separation area 1 through the connecting pipe 1-3.

[0050] In this embodiment, by integrating the biogas water seal and gas-water separation on an integrated device, the integrated design of the water seal and gas-water separation functions is realized, reducing the floor area, and also simplifying the layout and installation of pipelines and other equipment between the water seal area 2 and the gas-water separation area 1. The integrated design reduces the risk of biogas leakage; at the same time, the gas-water separation area 1 is arranged above the water seal area 2, so that the separated water generated after gas-water separation can be automatically discharged to the water seal area 2, and the biogas after water seal can also enter the gas-water separation area 1 through the connecting pipe 1-3; and the structure of this device is simple, without electrical equipment, which can reduce the floor area, reduce pipeline installation, and the operation and management difficulty is extremely low.

[0051] In some feasible embodiments, Figure 1 As shown, a partition 1-5 is arranged between the gas-water separation zone 1 and the water seal zone 2, so that the cylinder is divided into two areas, the gas-water separation zone 1 and the water seal zone 2. The partition 1-5 is arranged in the horizontal direction, and a connecting pipe 2-2 is vertically installed in the center of the partition 1-5. The connecting pipe 2-2 is opened at the installation position of the partition 1-5, so as to realize the connection between the connecting pipe 2-2 and the gas-water separation zone 1. The other end of the connecting pipe 2-2 extends to the bottom end of the cylinder of the water seal zone 2. The separated water generated by the biogas after the gas-water separation will flow into the water seal zone 2 through the connecting pipe 2-2, so as to realize the automatic discharge of the water after the gas-water separation. In this embodiment, the end of the connecting pipe 2-2 is 5mm away from the bottom plate of the water seal zone 2. In actual applications, the distance between the end of the connecting pipe 2-2 and the bottom plate of the water seal zone 2 can be set as needed, so that the end of the connecting pipe 2-2 is close to the bottom plate of the water seal zone 2, which can reduce the overall height of the equipment. The end of the connecting pipe 2-2 away from the partition plate 1-5 is defined as the terminal end of the connecting pipe 2-2.

[0052] In the above scheme, the cylinder is divided into two areas, the gas-water separation area 1 and the water seal area 2, by the partition 1-5, so that the division of equipment functions is clearer. The setting of the connecting pipe 2-2 enables the separation water generated after the gas-water separation of the biogas to automatically flow into the water seal area 2 through the connecting pipe 2-2, and drainage can be achieved without manual operation.

[0053] like Figure 1 As shown, a biogas inlet pipe 2-1 is provided through the side wall of the water seal area 2 near the gas-water separation area 1. The biogas inlet pipe 2-1 is provided above the water seal area 2. The biogas inlet pipe 2-1 is connected to the gas outlet of the anaerobic reactor through a pipeline, that is, the biogas inlet pipe 2-1 is used as the biogas inlet of the device. The biogas inlet pipe 2-1 is located in the water seal area 2 and extends below the water seal liquid level of the water seal area 2, so that the biogas escapes from the water after entering below the water seal liquid level through the biogas inlet pipe 2-1, thereby achieving a water seal effect. It can be imagined that the setting position of the biogas inlet pipe 2-1 on the side wall of the water seal area 2 should be higher than the water seal liquid level of the water seal area 2.

[0054] like Figure 1 As shown, in the preferred embodiment, the end of the biogas inlet pipe 2-1 is 5-10 cm higher than the end of the connecting pipe 2-2, thereby preventing biogas from directly entering the gas-water separation zone 1 from the connecting pipe 2-2, wherein the end of the biogas inlet pipe 2-1 away from the anaerobic reactor is defined as the end of the biogas inlet pipe 2-1.

[0055] like Figure 1As shown, in the preferred solution, a liquid level gauge 2-3 is also provided on the water seal area 2. The liquid level gauge 2-3 can be a mechanical liquid level gauge; in this embodiment, the liquid level gauge 2-3 is a glass tube liquid level gauge. The liquid level gauge 2-3 is installed on the outer wall in the middle of the water seal area 2, and both ends of the liquid level gauge 2-3 extend into the water seal area 2 respectively. The water level in the water seal area 2 is indicated by the liquid level gauge 2-3, and the middle scale of the liquid level gauge 2-3 is aligned with the water seal liquid level line, where the water seal liquid level line is the highest liquid level in the water seal area 2; at the same time, a water pipe 2-4 and a valve 2-5 are provided at the bottom of the water seal area 2. The valve 2-5 is installed on the water pipe 2-4. The water pipe 2-4 serves as the water inlet and drain outlet of the water seal area 2, and is used to fill the water for water seal into the water seal area 2 at the initial stage of equipment operation, or to drain the water in the water seal area 2 completely. During daily operation, the valve 2-5 is in a normally closed state, so that the liquid level height in the water seal area 2 remains constant.

[0056] As Figure 1 shown, in the preferred solution, an overflow port 2-6 is also provided on the side wall of the water seal area 2. The overflow port 2-6 is approximately set in the middle of the water seal area 2. Specifically, the installation height of the overflow port 2-6 should be flush with the height of the water seal liquid level line in the water seal area 2. One end of the overflow port 2-6 facing away from the water seal area 2 is installed with a U-shaped pipe 3-1. The U-shaped pipe 3-1 is a positive U-shaped pipe, that is, the opening of the U-shaped pipe 3-1 faces upward. One end of the U-shaped pipe 3-1 facing away from the overflow port 2-6 is communicated with the atmosphere, and this end is defined as the drain port 3-2. The excess water in the water seal area 2 is discharged through the overflow port 2-6 and the U-shaped pipe 3-1, ensuring a constant water seal liquid level and preventing the liquid level in the water seal area 2 from being too high or too low, which affects the water seal effect. When the water separated by the gas-liquid separation area 1 is discharged into the water seal area 2 through the connecting pipe 2-2, the excess water will be discharged into the U-shaped pipe 3-1 through the overflow port 2-6 and then flow out automatically from the drain port 3-2 of the U-shaped pipe 3-1, so as to automatically maintain the water level in the water seal area 2 in a constant state. And compared with the inverted U-shaped drain pipe 2-4 in the existing equipment, it prevents the siphon effect from causing the water seal liquid level to drop. During the working process, the U-shaped pipe 3-1 should keep the pipeline unobstructed, and the drain port 3-2 must be communicated with the atmosphere and cannot be blocked.

[0057] In this embodiment, the U-shaped pipe 3-1 can be a pipe made of rigid materials such as steel pipes and PVC pipes, or a pipe made of flexible materials such as corrugated pipes and rubber hoses, and the pipe is bent into a U shape.

[0058] In this embodiment, the drain port 3-2 and the overflow port 2-6 are at the same height, ensuring that the two straight pipe sections of the U-shaped pipe 3-1 have the same height.

[0059] As Figure 1As shown in the figure, in this embodiment, a biogas outlet 1-1 is provided at the top of the gas-liquid separation zone 1. After the biogas passes through the water seal and gas-liquid separation, it is discharged from the biogas outlet 1-1. That is, this outlet is the final outlet of the biogas of this equipment.

[0060] In this embodiment, the U-shaped tube 3-1 includes two straight tube sections. The water column pressure corresponding to the height h of the straight tube section of the U-shaped tube 3-1 should be 1.5-2 times the absolute pressure P of the biogas outlet. At the same time, the height of the U-shaped tube 3-1 must be higher than the height formed by the water seal liquid level line to the lower edge of the biogas inlet pipe 2-1. The pressure inside the U-shaped tube 3-1 is relatively greater. Therefore, the biogas can only break through the liquid level in the water seal zone 2 and enter the gas-liquid separation zone 1 through the connecting pipe 1-3, so that the U-shaped tube 3-1 also forms a water seal effect on the biogas, avoiding the leakage of biogas from the U-shaped tube 3-1 and improving the safety and reliability of the equipment. The conversion relationship is as follows:

[0061] h = a×P×10

[0062] In the formula, h is the height of the straight tube section, with the unit of cm; a is the multiple, and the value range is 1.5-2; P is the absolute pressure of the biogas outlet 1-1, with the unit of kPa. Among them, the absolute pressure of the biogas outlet 1-1 is the net pressure of the biogas outlet 1-1. Excluding the influence of the atmospheric pressure, this value is consistent with the pressure in the gas-liquid separation zone 1. Here, the net pressure is expressed by the water column height. 1 kPa gas pressure corresponds to 10 cm water column height.

[0063] In this embodiment, setting the water column pressure corresponding to the height h of the straight tube section of the U-shaped tube 3-1 to be 1.5-2 times the absolute pressure P of the biogas outlet 1-1 can achieve the positive and negative pressure protection function:

[0064] a. When operating normally, the U-shaped tube 3-1 is filled with water, and there is a liquid level difference in the two straight tube sections of the U-shaped tube 3-1. The water column pressure formed is greater than the biogas pressure in the gas-liquid separation zone 1. At this time, the separated biogas can only be discharged from the biogas outlet 1-1, and the water is discharged from the U-shaped tube 3-1.

[0065] b. When the positive pressure exceeds the limit, that is, when the pressure in the gas-liquid separation zone 1 is greater than the water column pressure formed by the liquid level difference in the two straight tube sections of the U-shaped tube 3-1, the water in the U-shaped tube 3-1 will be discharged for pressure relief under the action of the biogas pressure. After that, the inside of the whole equipment is connected to the external atmosphere, realizing the positive pressure protection.

[0066] c. When the negative pressure exceeds the pressure, that is, the negative pressure in the gas-water separation area 1 is lower than the water column pressure formed by the liquid level difference h of the two straight pipe sections of the U-shaped pipe 3-1, for example, negative pressure is generated at the biogas inlet, and the water in the U-shaped pipe 3-1 will be sucked into the water seal area 2 under the action of negative pressure. When all the water in the U-shaped pipe 3-1 is sucked into the water seal area 2, the entire equipment is connected to the external atmosphere at this time. Under the action of negative pressure, external air will enter the equipment and communicate with the air until the negative pressure disappears, thereby achieving negative pressure protection.

[0067] like Figure 2 As shown, in the preferred scheme, a duckbill-type air outlet 1-4 is provided at one end of the connecting pipe 1-3 extending into the gas-water separation zone 1, and a guide tube 1-2 is provided at the top of the gas-water separation zone 1 corresponding to the biogas outlet 1-1. The guide tube 1-2 is arranged in the middle of the gas-water separation zone 1 along the vertical direction, wherein the guide tube 1-2 is a tubular structure, the upper end of the guide tube 1-2 is connected to the biogas outlet 1-1, and the end of the guide tube 1-2 away from the biogas outlet 1-1 is open, so that the biogas after gas-water separation can enter the interior of the guide tube 1-2 through the opening, and then be discharged from the system through the biogas outlet 1-1. The duckbill-shaped air outlet 1-4 is eccentrically arranged with respect to the central axis of the guide tube 1-2, and the biogas after water sealing is ejected through the duckbill-shaped air outlet 1-4, and the ejected biogas moves in a spiral shape along the outer wall of the guide tube 1-2 to the bottom of the guide tube 1-2, and realizes gas-water separation under the action of centrifugal force and gravity, and the separated water flows along the inner wall to the partition 1-5, and flows into the water seal area 2 through the connecting pipe 2-2, and the separated biogas enters the interior of the guide tube 1-2, and is finally discharged from the system through the biogas outlet 1-1, realizing gas-water separation.

[0068] In the above scheme, the duckbill-shaped air outlet 1-4 is more conducive to the ejection of biogas. The duckbill-shaped air outlet 1-4 is set off-axis with respect to the central axis of the guide tube 1-2, and cooperates with the guide tube 1-2, so that the ejected biogas can more easily form a spiral downward movement along the outer wall of the guide tube 1-2, making the movement path of the biogas longer. Under the dual effects of centrifugal force and gravity, the water vapor in the biogas has enough time to form water droplets, thereby effectively separating them from the biogas, thereby improving the efficiency of gas-water separation.

[0069] In a second aspect, the present invention also discloses a biogas water seal and gas-water separation method, using the above-mentioned biogas water seal and gas-water separation integrated device, and vertically installing the integrated device, and after each interface is checked for leakage, it is considered to be ready for operation; Figure 3 As shown in the figure, the small arrows are the biogas movement path, and the large arrows are the separation water movement path. The specific steps include:

[0070] S1: Water is introduced into the water seal area 2 until the water in the water seal area 2 enters the U-shaped pipe 3-1 from the overflow port 2-6 and fills the U-shaped pipe 3-1. Specifically, in step S1, the tap water pipe is connected to the pipeline through a hose, the valve 2-5 is opened, and water is filled into the cylinder body of the water seal area 2. During this process, the water level is observed through the liquid level gauge 2-3 until the water enters the U-shaped pipe 3-1 from the overflow port 2-6 and fills the U-shaped pipe 3-1, and then the valve 2-5 is closed.

[0071] S2: The biogas discharged from the anaerobic generator is introduced below the water seal liquid level in the water seal area 2, and the biogas escaping after water seal enters the upper cavity above the water seal liquid level in the water seal area 2 to complete the water seal. In step S2, the biogas pipeline of the anaerobic reactor can be directly connected to the biogas inlet pipe 2-1, and then biogas is introduced into the water seal area 2. The entering biogas must escape to the upper cavity of the water seal area 2 after passing through the water seal section, thus realizing the function of water seal.

[0072] S3: Since there is a connecting pipe 1-3 between the upper cavity of the water seal area 2 and the gas-liquid separation area 1, the biogas after water seal can easily enter the gas-liquid separation area 1 through the connecting pipe 1-3. The end of the connecting pipe 1-3 is a duckbill-shaped air outlet 1-4. Since the duckbill-shaped air outlet 1-4 and the draft tube 1-2 are installed off-axis, the biogas is sprayed towards the draft tube 1-2 through the duckbill-shaped air outlet 1-4 at the end of the connecting pipe 1-3. The draft tube 1-2 makes the biogas move downward along the outer wall of the draft tube 1-2 in a spiral shape to the bottom of the draft tube 1-2, and gas-liquid separation is achieved under the action of centrifugal force and gravity.

[0073] S4: The water after gas-liquid separation flows along the inner wall of the gas-liquid separation area 1 to the partition 1-5, and then flows into the water seal area 2 through the connecting pipe 2-2. When the water level in the water seal area 2 reaches the water seal liquid level line, since the water generated in the gas-liquid separation area 1 will continuously enter the water seal area 2 through the connecting pipe 2-2, the excess water flows into the U-shaped pipe 3-1 through the overflow port 2-6. According to the principle of the communicating vessel of the U-shaped pipe 3-1, the excess water will overflow through the final drain port 3-2 of the U-shaped pipe 3-1, maintaining the stability of the water level in the water seal area 2. The biogas after gas-liquid separation enters the inside of the draft tube 1-2 and is discharged through the biogas outlet 1-1.

[0074] During this process, since there is a connecting pipe 1-3 between the gas-liquid separation area 1 and the water seal area 2, the air pressures in the two areas of the gas-liquid separation area 1 and the water seal area 2 are the same. Therefore, after gas-liquid separation, only water enters the water seal area 2 through the connecting pipe 2-2, and the biogas will not return to the gas-liquid separation area 1 through the connecting pipe 2-2.

[0075] In the above solution, based on the biogas water seal and the integrated gas-water separation equipment, an integrated design of the water seal and gas-water separation functions is achieved; through the guide cylinder 1-2 and the duckbill-shaped air outlet 1-4, after the biogas enters the gas-water separation area 1, it can move downward in a spiral shape along the outer wall of the guide cylinder 1-2. Under the action of centrifugal force and gravity, the efficiency of gas-water separation is greatly improved, ensuring the high-purity output of biogas; the design of the water seal area 2 enables the biogas to pass underwater to achieve water seal. Through the U-shaped pipe 3-1 and the overflow port 2-6, the water level in the water seal area 2 can be kept relatively stable. Since the gas-water separation area 1 and the water seal area 2 are connected by a communication pipe 1-3 and the air pressures in the two areas are the same, water can flow unidirectionally from the gas-water separation area 1 into the water seal area 2, while the biogas will not flow reversely; the method is convenient, safe, and easy to operate.

[0076] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A biogas water seal and gas-water separation integrated device, characterized in that: include: An air-water separation zone (1) and a water seal zone (2) are arranged in the same cylinder, wherein the water seal zone (2) is arranged below the air-water separation zone (1); A connecting pipe (2-2) is arranged in the cylinder, one end of the connecting pipe (2-2) is connected to the gas-water separation area (1), and the other end of the connecting pipe (2-2) extends below the water seal liquid level in the water seal area (2) and is arranged close to the bottom plate of the water seal area (2); A connecting pipe (1-3) is also provided on the side wall of the water seal area (2) above the water seal liquid surface, and one end of the connecting pipe (1-3) facing away from the water seal area (2) extends to the interior of the gas-water separation area (1).

2. The biogas water seal and gas-water separation integrated equipment according to claim 1, characterized in that: The gas-water separation zone (1) and the water seal zone (2) are separated by a partition (1-5); The connecting pipe (2-2) is arranged at the center of the partition (1-5), and the end of the connecting pipe (2-2) is spaced apart from the bottom plate of the water seal area (2). The connecting pipe (2-2) is used to pass the separated water generated after gas-water separation into the water seal area (2).

3. The biogas water seal and gas-water separation integrated equipment according to claim 1, characterized in that: A biogas inlet pipe (2-1) is provided through the side wall of the water seal area (2) close to the gas-water separation area (1); the biogas inlet pipe (2-1) is located on one side of the water seal area (2) and extends below the water seal liquid level of the water seal area (2).

4. The biogas water seal and gas-water separation integrated equipment according to claim 3, characterized in that: The end of the biogas inlet pipe (2-1) is arranged higher than the end of the connecting pipe (2-2), and the distance between the end of the biogas inlet pipe (2-1) and the end of the connecting pipe (2-2) is 5-10 cm.

5. A biogas water seal and gas-water separation integrated device according to any one of claims 1 to 4, characterized in that: A liquid level meter (2-3) is also installed on the water seal area (2), and the liquid level meter (2-3) is used to indicate the water level of the water seal area (2); A water pipe (2-4) and a valve (2-5) installed on the water pipe (2-4) are provided at the bottom of the water seal area (2); the water pipe (2-4) is used to introduce or discharge water into or out of the water seal area (2).

6. The biogas water seal and gas-water separation integrated equipment according to claim 5, characterized in that: An overflow port (2-6) is also provided on the side wall of the water seal area (2); a U-shaped tube (3-1) is installed at one end of the overflow port (2-6) away from the water seal area (2); one end of the U-shaped tube (3-1) away from the overflow port (2-6) is connected to the atmosphere; the overflow port (2-6) and the U-shaped tube (3-1) are used to discharge excess water in the water seal area (2) to keep the liquid level in the water seal area (2) constant, thereby realizing positive and negative pressure protection.

7. The integrated biogas water seal and gas-water separation device according to claim 6, characterized in that: The overflow port (2-6) is arranged at a height that is flush with the height of the water seal liquid level line in the water seal area (2); The end of the U-shaped tube (3-1) away from the overflow port (2-6) is defined as a drain port (3-2), and the drain port (3-2) and the overflow port (2-6) are located at the same height.

8. The integrated biogas water seal and gas-water separation device according to claim 6 or 7, characterized in that: The top of the gas-water separation zone (1) is provided with a biogas outlet (1-1) for discharging biogas after water sealing and gas-water separation; The U-shaped tube (3-1) comprises two straight tube sections, and the height of the straight tube sections is: h=a×P×10 In the formula, h is the height of the straight pipe section; a is a multiple, and the value range is 1.5-2; P is the absolute pressure of the biogas outlet (1-1).

9. The integrated biogas water seal and gas-water separation device according to claim 8, characterized in that: The connecting pipe (1-3) extends into one end of the gas-water separation zone (1) and is provided with a duckbill-shaped gas outlet (1-4); the top of the gas-water separation zone (1) is provided with a guide tube (1-2) corresponding to the biogas outlet (1-1); the guide tube (1-2) is arranged in the middle of the gas-water separation zone (1) along the vertical direction; the guide tube (1-2) is connected to the biogas outlet (1-1); and one end of the guide tube (1-2) facing away from the biogas outlet (1-1) is open; The duckbill-shaped gas outlet (1-4) is arranged off-axis with respect to the central axis of the guide tube (1-2), and the guide tube (1-2) is used to drive the biogas ejected from the duckbill-shaped gas outlet (1-4) to move spirally downward along the outer wall of the guide tube (1-2) to achieve gas-water separation.

10. A biogas water seal and gas-water separation method, characterized in that: Using the biogas water seal and gas-water separation integrated device as claimed in claim 9, the steps are: Water is introduced into the water seal area (2) until the water in the water seal area (2) enters the U-shaped tube (3-1) from the overflow port (2-6) and fills the U-shaped tube (3-1); The biogas discharged from the anaerobic generator is introduced into the water seal area (2) below the water seal liquid level, and the biogas escaping after the water seal enters the upper cavity of the water seal area (2) above the water seal liquid level, thereby completing the water seal; The biogas after water sealing is introduced into the gas-water separation zone (1) through the connecting pipe (1-3), and the biogas is ejected toward the guide tube (1-2) through the duckbill-shaped gas outlet (1-4) at the end of the connecting pipe (1-3). The guide tube (1-2) causes the biogas to move downward in a spiral along the outer wall of the guide tube (1-2), and the gas-water separation is completed under the action of centrifugal force and gravity; The water after gas-water separation flows into the water seal area (2) through the connecting pipe (2-2); when the water level in the water seal area (2) reaches the water seal liquid level line, the excess water is discharged through the overflow port (2-6) and the U-shaped pipe (3-1); the biogas after gas-water separation enters the interior of the guide tube (1-2) from the bottom of the guide tube (1-2) and is discharged through the biogas outlet (1-1).

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