Novel water-sealed tank of biogas system

Abstract

The utility model provides a novel water-sealed tank for a biogas system. The novel water-sealed tank comprises a water-sealed tank body, a detachable top cover, a liquid level meter lower connecting pipe orifice, a liquid level meter upper connecting pipe orifice, a biogas inlet pipe orifice, an air inlet inner extending pipe, a water replenishing pipe orifice, a biogas outlet pipe orifice, a tank bottom pipe orifice, an explosion venting pipe orifice, an overflow pipe orifice, an explosion venting overflow pipe, an in-situ pressure gauge and a detachable bracket. The beneficial effects of the utility model are that the detachable top cover can be used for the maintenance of equipment; water in the water-sealed tank can be automatically discharged through the explosion venting overflow pipe, and the liquid level is not higher than the set liquid level, so that the biogas generated by the anaerobic reactor can flow under the set water-sealed condition; and redundant replenished water or condensed water brought by biogas is automatically discharged in an overflow manner, so that the risk that the liquid level of a water seal is reduced too much or even the water seal is lost due to misoperation can be effectively avoided, and the daily operation and maintenance workload can be effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the biogas treatment technical field, especially a new type of biogas system water seal tank is provided. BACKGROUND

[0002] In the process of anaerobic treatment of sewage, the biogas produced by one or more anaerobic reactors needs to be collected to a biogas temporary storage and treatment system. In order to avoid the flame backflow to the anaerobic reactor when the biogas temporary storage and treatment system fails, and also to avoid the safety risk caused by the direct communication of the biogas pipelines of different anaerobic reactors, a water seal tank needs to be arranged at the biogas outlet of each anaerobic reactor.

[0003] According to the need of parking and maintenance, the outlet of the water seal tank of different anaerobic reactors is provided with a shut-off valve. When the conventional water seal tank is used, if the outlet shut-off valve is misoperated, the biogas produced by the anaerobic reactor cannot be timely transported to the biogas temporary storage and treatment system or vented through the biogas collection pipeline, the volume and pressure of the biogas in the water seal tank and the three-phase separator of the anaerobic reactor rise above the normal working condition, until the three-phase separator is filled with biogas and overflows to the top of the anaerobic reactor, and is discharged into the waste gas treatment system. This working condition on the one hand makes it necessary to use a larger buoyancy parameter for equipment design, thereby increasing the engineering cost, and on the other hand, the biogas entering the waste gas treatment system is not conducive to the normal operation of the waste gas treatment system due to the combustibility of methane and the toxicity of hydrogen sulfide.

[0004] When the biogas comes out of the three-phase separator of the anaerobic reactor, it will wrap a part of water vapor. After heat exchange and cooling in the pipeline with lower temperature, the carried water vapor condenses into liquid. Then, when passing through the water seal tank, part of the liquid water will be intercepted in the water seal tank, so that the water seal height gradually rises. In order to control the height of the water seal, the water needs to be manually drained by the operation and maintenance personnel regularly when the conventional water seal tank is used. This method has the risk of reducing the liquid level too much and damaging the water seal when misoperated, and also makes the water seal height in the water seal tank unstable, thereby affecting the stability of the biogas pressure in the three-phase separator and the operation of the anaerobic reactor. TECHNICAL FIELD

[0005] Therefore, the utility model aims at providing a new type of biogas system water seal tank to solve at least one problem existing in the prior art.

[0006] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0007] The utility model provides a new type of water seal tank of marsh gas system, including water seal tank body, detachable top cover, liquid level meter lower part connecting pipe orifice, liquid level meter upper part connecting pipe orifice, marsh gas inlet pipe orifice, inlet inner pipe, water supplement pipe orifice, marsh gas outlet pipe orifice, tank bottom pipe orifice, blow -off pipe orifice, overflow pipe orifice, blow -off overflow pipe, just -in -place pressure gauge and detachable support, water seal tank body one side from top to bottom installs liquid level meter upper part connecting pipe orifice, liquid level meter lower part connecting pipe orifice in proper order, installs detachable top cover on water seal tank body top, installs marsh gas inlet pipe orifice, water supplement pipe orifice, marsh gas outlet pipe orifice, just -in -place pressure gauge and inlet inner pipe on detachable top cover, and detachable top cover is connected with water seal tank body, and inlet inner pipe is located in water seal tank body, installs tank bottom pipe orifice on water seal tank body bottom, and tank bottom pipe orifice one side is connected with blow -off overflow pipe pipeline, installs blow -off pipe orifice on blow -off overflow pipe top, installs overflow pipe orifice on blow -off overflow pipe lower side, and blow -off overflow pipe is installed to water seal tank body one side through detachable support.

[0008] Further, the liquid level meter lower part connecting pipe orifice, liquid level meter upper part connecting pipe orifice, marsh gas inlet pipe orifice, inlet inner pipe, water supplement pipe orifice, marsh gas outlet pipe orifice, tank bottom pipe orifice, detachable support are all connected with the water seal tank body or detachable top cover or blow -off overflow pipe by welding. The blow -off pipe orifice and overflow pipe orifice are all connected with the blow -off overflow pipe by welding.

[0009] Further, the tank bottom pipe orifice and blow -off overflow pipe are connected by flange connection, and the just -in -place pressure gauge and water supplement pipe orifice are connected with the detachable top cover by flange connection.

[0010] Further, the water seal tank body and detachable top cover are made of steel.

[0011] Further, the blow -off overflow pipe comprises a first pipe, a second pipe, a third pipe, a fourth pipe, a fifth pipe, a sixth pipe, a seventh pipe, an eighth pipe and a ninth pipe. The first pipe is connected with the tank bottom pipe orifice, and the second pipe, the third pipe and one end of the fourth pipe are connected in sequence. The other end of the fourth pipe is connected with the fifth pipe and the sixth pipe. The blow -off pipe orifice is installed on the fifth pipe, and the sixth pipe is connected with the overflow pipe orifice through the seventh pipe, the eighth pipe and the ninth pipe.

[0012] Further, the first pipe, the second pipe, the third pipe and the fourth pipe are connected by elbows, and the sixth pipe, the seventh pipe, the eighth pipe and the ninth pipe are connected by elbows.

[0013] Further, the height H1 of the eighth pipe is not less than 250mm.

[0014] Further, the length of the inlet inner pipe meets certain requirements, and the height H2 from the tank bottom should be greater than the pipe diameter and not less than 100mm.

[0015] Further, the biogas inlet pipe and the biogas outlet pipe should be equal in size to the external connection of the biogas pipe.

[0016] Further, the drain pipe and the explosion relief overflow pipe should not be smaller than the size of the water supply pipe.

[0017] Compared with the prior art, the novel biogas system water seal tank has the following advantages:

[0018] (1) The novel biogas system water seal tank can be used for equipment inspection and maintenance, the water in the water seal tank can be automatically discharged through the overflow explosion relief pipe, the liquid level will not be higher than the set liquid level, the biogas generated by the anaerobic reactor can flow under the set water seal condition, the excess water supply or condensate water brought by the biogas can be automatically discharged in the form of overflow, the risk of water seal liquid level being too low or even losing water seal due to misoperation can be effectively avoided, and the daily operation and maintenance workload can be effectively reduced.

[0019] (2) The novel biogas system water seal tank can ensure that the pressure in the biogas inlet pipe is maintained in a relatively stable range, and can ensure that the biogas will not excessively accumulate in the three-phase separator of the anaerobic reactor, and will not be leaked to the waste gas treatment system in a large amount, thereby affecting the safe and stable operation of the waste gas treatment system.

[0020] (3) The novel biogas system water seal tank can maintain the gas pressure in the water seal tank in a relatively stable range, and the maximum value is the pressure corresponding to the height difference from the overflow port of the explosion relief overflow pipe to the lowest point of the pipeline. Due to the balance of the pressure on both sides, the parameter is used to calculate the maximum value of the buoyancy generated by the anaerobic three-phase separator. Compared with the maximum buoyancy value of the three-phase separator of the anaerobic reactor in the prior art, which is calculated as the maximum buoyancy value calculation point when the biogas overflows from the bottom of the gas collection chamber, after the adoption of the present application, the maximum buoyancy value will be effectively reduced, thereby effectively reducing the anti-floating engineering quantity of the three-phase separator. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, and are incorporated herein for purposes of illustration. The embodiments of the present application, and the explanations given, serve to explain the application, and are not intended to limit the application unduly.

[0022] Fig. 1 The overall structure schematic view according to the embodiment of the present application;

[0023] Fig. 2The utility model discloses an explosion venting overflow pipe schematic diagram.

[0024] Mark explanation:

[0025] 1, water seal tank body;2, detachable top cover;3, liquid level meter lower part connecting pipe orifice;4, liquid level meter upper part connecting pipe orifice;5, biogas inlet pipe orifice;6, inlet inner pipe;7, water supply pipe orifice;8, biogas outlet pipe orifice;9, tank bottom pipe orifice;10, explosion venting orifice;11, overflow orifice;12, explosion venting overflow pipe;121, first pipe line;122, second pipe line;123, third pipe line;124, fourth pipe line;125, fifth pipe line;126, sixth pipe line;127, seventh pipe line;128, eighth pipe line;129, ninth pipe line;13, local pressure gauge;14, detachable support. Specific implementation

[0026] It should be explained that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0027] In the description of the utility model, it is understood that the orientation or position relation indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0028] In the description of the utility model, it should be explained that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected;It can be mechanical connection, or electrical connection;It can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0029] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0030] As Figs. 1-2As shown, a new water seal tank of biogas system includes a water seal tank body 1, a detachable top cover 2, a lower liquid level meter connecting pipe 3, an upper liquid level meter connecting pipe 4, a biogas inlet pipe 5, an inlet inner pipe 6, a water supplement pipe 7, a biogas outlet pipe 8, a tank bottom pipe 9, a blow-off pipe 10, an overflow pipe 11, a blow-off overflow pipe 12, an on-site pressure gauge 13, and a detachable support 14. The lower liquid level meter connecting pipe, the upper liquid level meter connecting pipe, the biogas inlet pipe, the inlet inner pipe, the water supplement pipe, the biogas outlet pipe, the tank bottom pipe, and the detachable support are all connected to the water seal tank body or the detachable top cover by welding. The blow-off pipe and the overflow pipe are connected to the blow-off overflow pipe by welding. The detachable top cover is connected to the tank body by flange. The tank bottom pipe is connected to the blow-off overflow pipe by flange. The on-site pressure gauge and the water supplement pipe are connected to the detachable top cover by flange. The materials of all the above can be selected according to the composition of biogas.

[0031] The water seal tank body 1 and the detachable top cover 2 can be made of steel, and the specific size can be adjusted according to the water seal height and the size of the inlet and outlet gas. The lower liquid level meter connecting pipe 3, the upper liquid level meter connecting pipe 4, and the tank bottom pipe 9 can be processed by pipe and flange and then welded on the water seal tank body 1, used for installing a magnetic flap liquid level meter with a root valve and a remote transmission function. The biogas inlet pipe 5, the inlet inner pipe 6, and the biogas outlet pipe 8 can be processed by pipe and flange and then welded on the detachable top cover 2, and the size can be adjusted according to the size of the inlet and outlet gas, and the number of pipe openings can be adjusted according to the number of inlet and outlet pipes. The water supplement pipe 7 and the on-site pressure gauge 13 are installed on the detachable top cover by welding, and the valve of the water supplement pipe 7 and the top stub are connected to the flange on the stub by flange. The blow-off overflow pipe 12 includes a first pipe 121, a second pipe 122, a third pipe 123, a fourth pipe 124, a fifth pipe 125, a sixth pipe 126, a seventh pipe 127, an eighth pipe 128, and a ninth pipe 129. The first pipe 121 is connected to the tank bottom pipe 9 above, and the lower part of the first pipe 121 is sequentially connected to the second pipe 122, the third pipe 123, and one end of the fourth pipe 124. The other end of the fourth pipe 124 is connected to the fifth pipe 125 and the sixth pipe 126. The fifth pipe 125 is connected to the blow-off pipe 10 above, and the sixth pipe 126 is sequentially connected to the seventh pipe 127, the eighth pipe 128, and the ninth pipe 129, and the ninth pipe 129 is connected to the overflow pipe 11. The first pipe 121, the second pipe 122, the third pipe 123, and the fourth pipe 124 are connected by elbows, and the sixth pipe 126, the seventh pipe 127, the eighth pipe 128, and the ninth pipe 129 are connected by elbows. The length of the eighth pipe 128, i.e., the height H1, is not less than 250 mm.

[0032] The explosion relief overflow pipe 12 is a section of pipe with specific shape requirements; see details below. Fig. 2 It is made of pipes, fittings and flanges, etc. It is connected to the bottom pipe port 9 of the tank in the form of flanges and installed with the detachable bracket 14 by bolting. The explosion relief pipe port 10 and the overflow pipe port 11 are the ends of the explosion relief overflow pipe 12 that are connected to the atmosphere, and can be adjusted according to the size of the drainage volume and the explosion gas volume. There is a section of pipe that turns up before the overflow pipe port 11, namely the No. 8 pipe 128, whose length is also the height H1, and the height difference H1 shall not be less than 250mm.

[0033] The length of the air intake inner extension pipe 6 must meet the following length requirements: the height H2 from the bottom of the tank should be greater than the pipe diameter and not less than 100mm.

[0034]

[0035] The dimensions of the biogas inlet 5 and biogas outlet 8 should be the same as the diameter of the externally connected biogas pipe. The venting outlet 9 and the explosion relief overflow pipe 12 should not be smaller than the water supply outlet 7. The explosion relief outlet 10 is used to connect to subsequent explosion relief pipelines, and the connected explosion relief pipelines should ensure that the actual explosion relief point meets the requirements of relevant standards such as GB50160. The overflow outlet 11 can be connected to a drainage collection facility to collect the discharged condensate for further treatment.

[0036] In a preferred embodiment of this utility model, a local magnetic level gauge and an ultrasonic level gauge or a radar level gauge are used instead of a magnetic level gauge with remote transmission function.

[0037] In a preferred embodiment of this utility model, a maintenance manhole is added to the tank wall, and the detachable top cover is replaced by a fixed top cover to replace the maintenance function of the detachable top cover.

[0038] In a preferred embodiment of this invention, the water seal tank can also be used in other applications where liquid hydrostatic pressure is used to form a liquid seal.

[0039] The beneficial effects of the present application are: the detachable top cover can be used for equipment inspection and maintenance. The water in the water seal tank can be automatically discharged through the explosion vent overflow pipe, and the liquid level will not be higher than the set liquid level, so that the biogas produced by the anaerobic reactor can flow under the set water seal condition. The use of overflow form to automatically discharge excess water or condensate water brought by biogas can effectively avoid the risk of water seal liquid level being too low or even losing water seal due to misoperation, and can effectively reduce the daily operation and maintenance workload. The gas in the water seal tank mainly enters the subsequent biogas collection and treatment pipeline and equipment through the biogas outlet, and can also be discharged to the air through the explosion vent overflow pipe when the valve behind the water seal tank is misoperated, ensuring that the pressure in the biogas inlet pipe is maintained within a relatively stable range, ensuring that the biogas will not excessively accumulate in the three-phase separator of the anaerobic reactor, and will not leak into the waste gas treatment system in large quantities, affecting the safe and stable operation of the waste gas treatment system. The gas pressure in the water seal tank is maintained within a relatively stable range, and the maximum value is the pressure corresponding to the height difference from the overflow port of the explosion vent overflow pipe to the lowest point of its pipeline. Due to the balance of the pressure on both sides, this parameter is used to calculate the maximum value of the buoyancy that can be generated by the anaerobic three-phase separator. Compared with the previous calculation method of the maximum buoyancy value of the three-phase separator of the anaerobic reactor, which takes the overflow of biogas from the gas collection chamber bottom as the maximum buoyancy value calculation point, after using the present application, the maximum buoyancy value will be effectively reduced, and the anti-floating engineering quantity of the three-phase separator will be effectively reduced.

[0040] Principle of a new type of biogas system water seal tank

[0041] The water in the water seal tank is connected by the water supply port, and the liquid level in the tank is continuously rising until the overflow port of the explosion venting overflow pipe overflows, reaching the set liquid level, and will not exceed the set liquid level. After the water supply is completed, the water supply soft connection pipeline connected with the water supply port is disconnected in time to ensure that the toxic and harmful gas will not flow back to the water supply pipe. After the biogas enters from the biogas inlet pipe port, it passes through the inner extension pipe and the water seal liquid level, and because the pipeline near the water seal tank side of the explosion venting overflow pipe has the same liquid level as the tank, the biogas in the water seal tank will preferentially discharge from the gas outlet pipe port. The condensate and water vapor brought in by the biogas are partially trapped in the water seal tank, and are overflowed through the explosion venting overflow pipe, so that the water volume in the tank remains unchanged, and the liquid level is not higher than the set liquid level. When the biogas outlet port cannot discharge biogas due to misoperation or other reasons, the gas pressure in the water seal tank and the gas pressure in the biogas inlet pipe rise, the liquid in the tank is discharged through the overflow pipe port, the liquid level drops, and the liquid level in the pipeline near the tank body side of the explosion venting overflow pipe remains unchanged, the liquid level difference between the two ends increases continuously, and once it exceeds the height difference between the overflow port and the lowest point of the pipeline, because there is still a 250mm water seal liquid level in front of the overflow pipe port, the biogas will be discharged from the explosion venting pipe port. When the biogas pressure gradually rises, the remote liquid level meter will detect the signal of the decrease of the liquid level in the water seal tank, and the local pressure gauge will detect the signal of the high pressure in the water seal tank, and the operation and maintenance personnel can timely check and maintain or evacuate personnel. The root valve of the local pressure gauge is to facilitate the operation and maintenance of the instrument. The detachable top cover is to facilitate the inspection and maintenance work in the tank. The detachable bracket and the tank bottom pipe port are to facilitate the inspection and maintenance work of the overflow and explosion venting pipe. The tank bottom pipe port can also be used for tank emptying.

[0042] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A novel water sealed tank for biogas systems, characterized by: The water seal tank body (1) is provided with, from top to bottom, a liquid level meter upper connecting pipe (4), a liquid level meter lower connecting pipe (3), a biogas inlet pipe (5), an inlet inner pipe (6), a water supplement pipe (7), a biogas outlet pipe (8), a tank bottom pipe (9), a blow-off pipe (10), an overflow pipe (11), a blow-off overflow pipe (12), an on-site pressure gauge (13) and a detachable support (14).

2. A novel biogas system water seal tank according to claim 1, characterized in that: The liquid level meter lower connecting pipe (3), the liquid level meter upper connecting pipe (4), the biogas inlet pipe (5), the inlet inner pipe (6), the biogas outlet pipe (8), the tank bottom pipe (9) and the detachable support (14) are connected to the water seal tank body (1) or the detachable top cover (2) by welding.

3. A novel biogas system water seal tank according to claim 1, characterized in that: The tank bottom pipe (9) and the blow-off overflow pipe (12) are connected by flange connection, and the on-site pressure gauge (13) and the water supplement pipe (7) are connected to the detachable top cover (2) by flange connection.

4. A novel biogas system water seal tank according to claim 1, characterized in that: The water seal tank body (1) and the detachable top cover (2) are made of steel.

5. A novel biogas system water seal tank according to claim 1, characterized in that: The blow-off overflow pipe (12) comprises a first pipe (121), a second pipe (122), a third pipe (123), a fourth pipe (124), a fifth pipe (125), a sixth pipe (126), a seventh pipe (127), an eighth pipe (128) and a ninth pipe (129). The first pipe (121) is connected to the tank bottom pipe (9), and the second pipe (122), the third pipe (123) and the fourth pipe (124) are sequentially connected to the first pipe (121). The fifth pipe (125) is connected to the fourth pipe (124) and the sixth pipe (126), and the sixth pipe (126) is connected to the seventh pipe (127), the eighth pipe (128) and the ninth pipe (129).

6. A novel biogas system water seal tank according to claim 5, characterized in that: The first pipeline (121), the second pipeline (122), the third pipeline (123), the fourth pipeline (124) are connected by elbows, the sixth pipeline (126), the seventh pipeline (127), the eighth pipeline (128) and the ninth pipeline (129) are connected by elbows.

7. A novel biogas system water seal tank according to claim 5, characterized in that: The height H1 of the eighth pipeline (128) is not less than 250mm.

8. A novel biogas system water seal tank according to claim 1, characterized in that: The length of the gas inlet inner pipe (6) needs to meet certain requirements, and the height H2 from the tank bottom should be greater than the pipe diameter of the gas inlet inner pipe (6), and should not be less than 100mm.

9. A novel biogas system water seal tank according to claim 1, characterized in that: The sizes of the biogas inlet pipe (5) and the biogas outlet pipe (8) should be equal to the diameter of the external connected biogas pipe.

10. A novel biogas system water seal tank according to claim 1, characterized in that: The sizes of the tank bottom pipe (9) and the explosion relief overflow pipe (12) should not be smaller than the size of the water supply pipe (7).

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