A feeding and discharging process device for a biogas fermentation tank in a biogas project

Abstract

The application discloses a kind of biogas engineering biogas fermentation tank's feeding and discharging process device, belongs to biogas fermentation production engineering facility technical field, solve the existing biogas fermentation tank's feeding and discharging process device structure complex, the problem of continuous factory biogas production limitation.It is equipped with hollow conveying residue liquid and positive and negative pressure residue liquid suction tank in the tank cavity of biogas fermentation tank and is connected with transverse residue liquid communication pipe, and positive and negative pressure residue liquid suction tank is equipped with negative pressure air suction pipeline connection air compression system, tank is equipped with residue liquid conveying pipe in, residue liquid conveying pipe branch is connected with split inoculum conveying pipe, recycling residue liquid conveying pipe, biogas residue biogas liquid storage tank is equipped with biogas liquid overflow pipe and split inoculum conveying pipe connection feeding and stirring tank, feeding and stirring tank bottom side is equipped with feeding conveying pipe and is connected with biogas fermentation tank, hollow conveying residue liquid pipe is equipped with pressurized air conveying pipeline.It is practical in overall structure, applicable to the continuity factory biogas production engineering of high concentration fermentation process.

Description

Technical Field

[0001] This invention belongs to the technical field of biogas fermentation production engineering facilities, specifically a feeding and discharging process device for a biogas fermentation tank. Background Technology

[0002] With the continuous development and technological advancement of biogas fermentation production facilities, the technical requirements for the feeding and discharging processes of biogas digesters are becoming increasingly stringent, as these processes directly affect the actual operational quality and effectiveness of the biogas fermentation production project. In the prior art, existing biogas fermentation tank feeding and discharging processes mainly employ a feeding system installed at the top of the fermentation tank and a discharging system installed at the bottom of the tank. For example, Chinese Patent Publication No. CN107118945A discloses a dry, fully fermented biogas continuous and rapid feeding and discharging device, which includes a conical tank body integrally connected to the tank bottom to form a fermentation tank, an external feeding system for the fermentation tank, an internal discharging system for the fermentation tank, an upper feeding pipe installed at the top of the fermentation tank connected to several branch feeding pipes, the branch feeding pipes connected to the fermentation tank, the upper feeding pipe connected to an upper feeding box, the upper feeding box installing an upper feeding motor, the output shaft of which is connected to an upper feeding screw propeller, the other end of which extends into the left end of the upper feeding pipe, the upper feeding pipe connecting to a bottom feeding pipe, the bottom feeding pipe containing a bottom screw propeller, the lower end of which is connected to a bottom feeding motor, the bottom feeding motor installed at the lower end of the bottom feeding pipe, and a return pump connected to the biogas slurry tank. It can achieve continuous and rapid feeding and discharging of biogas during fermentation. However, its feeding system uses upper and lower feeding boxes and bottom and upper two-stage screw propellers. The upper feeding box is connected to the biogas slurry tank via a pipeline-connected return pump. The discharging system is driven by a slag discharge motor installed on the top of the tank, which is connected to a power vertical rod to rotate the blades, causing the biogas residue and biogas slurry to be discharged into the biogas slurry tank through the slag discharge pipe at the bottom of the tank. However, due to the limitations of its existing process equipment structure, the entire feeding and discharging device is complex and the process operation is cumbersome. It is also prone to dead zones in the fermentation tank, resulting in slow feeding and discharging processes, blockages, and low biogas conversion efficiency. Usually, it is necessary to stop the fermentation tank, perform large-scale discharge cleaning, replace the new material, and then restart it. This limits the continuous industrial biogas production of high-concentration fermentation processes and brings inconvenience to practical applications.

[0003] In view of this, in order to meet the actual needs of the development of biogas fermentation production engineering facilities, it is necessary to further improve and develop a feeding and discharging process device for biogas fermentation tanks. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies and address the problems of complex structures and limitations in continuous industrialized biogas production caused by current biogas digester feeding and discharging processes, this invention aims to provide a feeding and discharging process device with a practical overall structure, simple operation, uniform material feeding and discharging within the digester, smooth feeding and discharging processes in biogas projects, thorough fermentation and conversion of raw materials into biogas, good biogas conversion effect, reduced equipment investment, and suitability for continuous industrialized biogas production. This invention provides a convenient feeding and discharging process device for biogas digesters.

[0005] The technical solution adopted by this invention to solve the above problems is: a feeding and discharging process device for a biogas digester in a biogas project, comprising: a biogas digester, a feeding and mixing tank, a feeding and conveying pipe, a sludge discharge pipe joint, a waste biogas residue and biogas slurry storage tank, an air compression system, a positive and negative pressure suction and discharge sludge tank, and a hollow sludge conveying pipe. The hollow sludge conveying pipe is longitudinally connected inside the tank cavity of the biogas digester, and a positive and negative pressure suction and discharge sludge tank extending into the tank cavity is installed on the side of the hollow sludge conveying pipe on the digester body. A transverse sludge connecting pipe is connected to the positive and negative pressure suction and discharge sludge tank on the hollow sludge conveying pipe. The top of the positive and negative pressure suction and discharge sludge tank... The unit is equipped with a negative pressure suction pipe connected to an air compression system. A sludge conveying pipe is longitudinally inserted inside the tank. The bottom port of the sludge conveying pipe is located at the bottom of the positive and negative pressure suction and discharge sludge tank. The upper conveying pipe is branched to a diversion inoculum conveying pipe and a recycling sludge conveying pipe, respectively. The recycling sludge conveying pipe is connected to the biogas residue and biogas slurry storage tank. The upper side of the biogas residue and biogas slurry storage tank is equipped with a biogas slurry overflow pipe and a diversion inoculum conveying pipe, respectively connected to the feeding and mixing tank. The bottom side of the feeding and mixing tank is equipped with a feeding conveying pipe connected to the biogas fermentation tank. The top of the hollow sludge conveying pipe is equipped with a pressurized air conveying pipe connected to the air compression system.

[0006] In the above-mentioned biogas digester feeding and discharging process device in a biogas project, the bottom of the positive and negative pressure suction and discharge sludge tank is also connected to a sludge buffer tank, and the bottom of the sludge conveying pipe is inserted into the bottom of the sludge buffer tank.

[0007] The above-mentioned feeding and discharging process device for a biogas digester in a biogas project includes 1 to 23 sets of positive and negative pressure suction and discharge sludge tanks on the digester body. Each positive and negative pressure suction and discharge sludge tank is connected to a hollow sludge conveying pipe by a horizontal sludge connecting pipe, to an air compression system by a negative pressure suction pipe, and to a sludge conveying pipe that is connected to a diversion inoculum conveying pipe and a recycling sludge conveying pipe.

[0008] In the above-mentioned biogas digester feeding and discharging process device, the top of the sludge conveying pipe is equipped with any one of the combination pipe fittings of F-type tee and tee connecting elbow, and the sludge conveying pipe is respectively connected to the sludge inoculum conveying pipe and the recycling sludge conveying pipe.

[0009] The above-mentioned feeding and discharging process device for a biogas digester in a biogas project is provided with a flow control valve installed on either the recycling sludge conveying pipe or the diversion inoculum conveying pipe; or a flow control structure in which both the recycling sludge conveying pipe and the diversion inoculum conveying pipe are equipped with flow control valves.

[0010] In the above-mentioned biogas digester feeding and discharging process device, the diameter of the diversion inoculum conveying pipe is 30-85% of the diameter of the recycling sludge conveying pipe; the head of the diversion inoculum conveying pipe, which is directly inserted into the feeding mixing tank, is equipped with several inoculum spray nozzles that are all arranged obliquely.

[0011] The above-mentioned feeding and discharging process device for a biogas digester in a biogas project, wherein the horizontal sludge-liquid connecting pipe is connected to the hollow conveying sludge-liquid pipe in any of the following connection structures: vertical connection and tangential connection, as well as other applicable connection structures, and an outlet-downward elbow is installed at the end of the horizontal sludge-liquid connecting pipe connected to the positive and negative pressure suction and discharge sludge-liquid tank.

[0012] When using this invention, the feeding and discharging process device is assembled into the biogas digester according to design requirements and actual needs. Depending on the volume of the biogas digester and the specific fermentation raw materials and process, 1 to 23 sets (ideally 2 to 15 sets) of positive and negative pressure suction and discharge tanks, along with the sludge-liquid connecting pipes, negative pressure suction pipes, and sludge-liquid conveying pipe system for each tank, can be connected and assembled. When starting the biogas production device in the digester, the feeding and discharging process device uses an air compression system to draw negative pressure through the connected negative pressure suction pipes, drawing the biogas residue and slurry from the hollow sludge-liquid conveying pipes through the sludge-liquid connecting pipes into the positive and negative pressure suction and discharge tanks, filling them completely. The air compression system uses pressurized air... The conveying pipeline pressurizes the hollow conveying sludge and liquid pipe, and the pressure transports the biogas sludge and liquid to the positive and negative pressure suction and discharge tank through the sludge and liquid connecting pipe. The biogas sludge and liquid in the positive and negative pressure suction and discharge tank are then discharged through the sludge and liquid buffer tank connected to the bottom of the positive and negative pressure suction and discharge tank via the sludge and liquid conveying pipe. First, the biogas sludge and liquid are transported to the feeding and mixing tank through the diversion inoculum conveying pipe connected to the sludge and liquid conveying pipe and thoroughly mixed with the fermentation raw materials. The mixed fermentation material is then sent to the biogas fermentation tank through the feeding pipe. Second, the biogas sludge and liquid are transported to the biogas sludge and liquid storage tank through the recycling sludge and liquid conveying pipe connected to the sludge and liquid conveying pipe. The biogas liquid in the storage tank flows back into the feeding and mixing tank for recycling through the biogas liquid overflow pipe.

[0013] Because this invention adopts the above-mentioned technical solution, the discharge mechanism uses an air compression system connected to a hollow conveying slag-liquid pipe and a positive and negative pressure suction and discharge tank to perform positive and negative pressure suction and discharge of biogas slag-liquid. The feeding mechanism consists of a feeding mixing tank input section connected to the inoculum conveying pipe of the discharge mechanism and the biogas slurry overflow pipe of the slag-liquid storage tank. The input section is equipped with a feeding conveying pipe directly connected to the fermentation tank. This effectively solves the problem that the existing biogas fermentation tanks have complex feeding and discharging process devices, which limits the continuous industrial biogas production. Actual operation tests have also shown that it has advantages such as practical overall structure, simple process operation, uniform feeding and discharging within the fermentation tank, smooth feeding and discharging process in biogas projects, full fermentation of raw materials resulting in good biogas conversion, saving equipment investment, and ease of use. It is suitable for continuous industrial biogas fermentation production projects using high-concentration fermentation processes for raw materials such as straw, straw-manure mixtures, and livestock and poultry manure.

[0014] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the specific structure of an embodiment of the present invention.

[0017] Figure 2 yes Figure 1 An enlarged structural diagram of part A in the embodiment.

[0018] Figure 3 yes Figure 2 The embodiment shows a schematic diagram of a sludge conveying pipe that is connected to a diversion inoculum conveying pipe and a recycling sludge conveying pipe via an F-type tee, and a flow control valve is installed on the recycling sludge conveying pipe.

[0019] Figure 4 yes Figure 1 An enlarged structural diagram of the hollow conveying slag-liquid pipe tangentially connected to the transverse slag-liquid connecting pipe in the embodiment.

[0020] Figure 5 yes Figure 1An enlarged structural diagram of the embodiment showing a diversion inoculum delivery pipe connected to a pipe head body inside a feeding mixing tank, with 7 inoculum spray nozzles attached.

[0021] Figure 6 yes Figure 1 The biogas digester in this embodiment is equipped with two sets of parallel positive and negative pressure suction and discharge tanks for sludge and liquid. The two sets of positive and negative pressure suction and discharge tanks are respectively connected to a hollow sludge and liquid conveying pipe by a horizontal sludge and liquid connecting pipe, a negative pressure air suction pipe connected to an air compression system, and a sludge and liquid conveying pipe that is respectively connected to a diversion inoculum conveying pipe and a recycling sludge and liquid conveying pipe.

[0022] The labels in the attached diagram are as follows: 1-Biogas fermentation tank; 2-Air compression system; 3-Negative pressure intake pipe; 4-Pressurized air delivery pipe; 5-Positive and negative pressure intake and discharge tanks for sludge and liquid; 6-Sludge and liquid buffer tank; 7-Horizontal sludge and liquid connecting pipe; 701-Downward-facing elbow; 8-Hollow conveying pipe for sludge and liquid; 9-Sludge and liquid conveying pipe; 901-Tee; 902-Elbow; 903-Flow control valve; 904-Type F tee; 10-Diverting inoculum conveying pipe; 101-Inoculum spray nozzle; 11-Recycling and reusing sludge and liquid conveying pipe; 12-Feeding and mixing tank; 13-Feeding and conveying pipe; 14-Sludge and sludge storage tank; 15-Sludge overflow pipe; 16-Sludge and liquid conveying pipe connector; 17-Biogas output pipe connector; 18-Sludge and liquid discharge pipe connector with valve. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In the description of this invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "front end", "rear end", "head", "tail", "center", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0025] As attached Figures 1-2As shown, this embodiment includes: a biogas digester 1, a feeding and mixing tank 12, a feeding and conveying pipe 13, a sludge discharge pipe connector 16, a waste biogas residue and biogas slurry storage tank 14, an air compression system 2, a positive and negative pressure suction and discharge sludge tank 5, and a hollow sludge conveying pipe 8. The biogas digester 1 has a hollow sludge conveying pipe 8 longitudinally connected inside its tank cavity. A positive and negative pressure suction and discharge sludge tank 5 extending into the tank cavity is installed on the side of the digester body located on the hollow sludge conveying pipe 8. A biogas output pipe connector 17 is installed at the top of the digester 1, and a sludge conveying pipe connector 16 is installed at the bottom. A transverse sludge connecting pipe 7 is installed on the hollow sludge conveying pipe 8, connecting to the positive and negative pressure suction and discharge sludge tank 5. A negative pressure suction pipe 3 is installed at the top of the positive and negative pressure suction and discharge sludge tank 5, connecting to the air compression system. System 2, a sludge conveying pipe 9 is longitudinally inserted into the tank body. The bottom port of the sludge conveying pipe 9 is located at the bottom of the positive and negative pressure suction and discharge sludge tank 5. The upper conveying pipe body branches are respectively connected to the diversion inoculum conveying pipe 10 and the recycling sludge conveying pipe 11. The recycling sludge conveying pipe 11 is connected to the biogas residue and biogas slurry storage tank 14. The upper side of the biogas residue and biogas slurry storage tank 14 is connected to the biogas slurry overflow pipe 15 and the diversion inoculum conveying pipe 10, which are respectively connected to the feeding and mixing tank 12. The bottom side of the feeding and mixing tank 12 is connected to the feeding conveying pipe 13, which is connected to the biogas fermentation tank 1. The top of the hollow conveying sludge pipe 8 is connected to the pressurized air conveying pipe 4, which is connected to the air compression system 2. The bottom side of the biogas residue and biogas slurry storage tank 14 is connected to the sludge discharge pipe joint 18 with a valve.

[0026] For example, see Figure 1 In this embodiment, the bottom of the positive and negative pressure suction and discharge sludge tank 5 is also connected to a sludge buffer tank 6, and the bottom of the sludge conveying pipe 9 is inserted into the bottom of the sludge buffer tank 6.

[0027] Specifically, see Appendix Figure 6 In this embodiment, the biogas fermentation tank 1 is equipped with two sets of parallel positive and negative pressure suction and discharge sludge tanks 5. The two sets of positive and negative pressure suction and discharge sludge tanks 5 are respectively connected by a horizontal sludge-liquid connecting pipe 7 to a hollow conveying sludge-liquid pipe 8, a negative pressure air suction pipe 3 to an air compression system 2, and a sludge-liquid conveying pipe 9 to a diversion inoculum conveying pipe 10 and a recycling sludge-liquid conveying pipe 11. The diversion inoculum conveying pipe 10 and the recycling sludge-liquid conveying pipe 11 are respectively connected to a feeding and mixing tank 12 and a biogas residue and biogas slurry storage tank 14.

[0028] Preferred options are listed in the appendix. Figures 1-2 In this embodiment, the top of the sludge conveying pipe 9 is equipped with a combination pipe fitting that connects a tee 901 to a flow control valve 903 and then to an elbow 902. The branch pipe joint of the tee 901 is connected to the diversion inoculum conveying pipe 10, and the elbow 902 is connected to the recycling sludge conveying pipe 11.

[0029] For example, see Appendix Figure 3 In this embodiment, the top of the sludge conveying pipe 9 is connected to an F-type tee 903, which is connected to the diversion inoculum conveying pipe 10 and the recycling sludge conveying pipe 11 respectively. A flow control valve 903 is installed on the pipe body of the recycling sludge conveying pipe 11 located at the rear of the connected F-type tee 903.

[0030] For further details, see Appendix Figure 1 , Figure 5 In this embodiment, the diameter of the diversion inoculum conveying pipe 10 is 85% of the diameter of the recycling sludge conveying pipe; the top of the diversion inoculum conveying pipe 10 is directly inserted into the feeding mixing tank 12 and is equipped with 7 inoculum spray nozzles 101 that are all obliquely arranged in parallel, that is, obliquely arranged in parallel inoculum spray nozzles at a certain angle to the diversion inoculum conveying pipe 10 (as shown in this embodiment, the spray nozzle angle α is 30°), so that the sprayed inoculum is stirred and mixed with the raw materials in the feeding mixing tank.

[0031] Preferred options are listed in the appendix. Figure 1 , Figure 4 In this embodiment, the horizontal slag-liquid connecting pipe 7 is connected to the hollow conveying slag-liquid pipe 8 in a tangential connection structure, and an outlet-downward elbow 701 is installed at the end of the horizontal slag-liquid connecting pipe 7 that connects to the positive and negative pressure suction and discharge slag-liquid tank 5.

[0032] The above is merely one embodiment. Any other technical features and solutions derived by adding components, making equivalent substitutions, and making partial improvements without creative effort by those skilled in the art are all within the scope of protection of this patent.

Claims

1. A biogas fermentation tank feeding and discharging process device in a biogas project, comprising a biogas fermentation tank (1), a feeding and stirring tank (12), a feeding pipe (13), a residue and liquid discharge pipe joint (16), and a waste residue and liquid storage tank (14), characterized in that, The air compression system (2), the positive and negative pressure suction and discharge residue liquid tank (5), and the hollow residue liquid conveying pipe (8) are further included. The hollow residue liquid conveying pipe (8) is longitudinally connected in the tank body cavity of the biogas fermentation tank (1), and the positive and negative pressure suction and discharge residue liquid tank (5) is arranged on the side of the hollow residue liquid conveying pipe (8) and extends into the tank body cavity. The residue liquid conveying pipe (8) is further connected with the transverse residue liquid communication pipe (7) which is connected with the positive and negative pressure suction and discharge residue liquid tank (5). The top of the positive and negative pressure suction and discharge residue liquid tank (5) is connected with the negative pressure air suction pipe (3) which is connected with the air compression system (2). The residue liquid conveying pipe (9) is longitudinally inserted into the tank body. The bottom of the residue liquid conveying pipe (9) is connected with the positive and negative pressure suction and discharge residue liquid tank (5). The upper part of the residue liquid conveying pipe (9) is branched into the split inoculum conveying pipe (10) and the recycling residue liquid conveying pipe (11). The recycling residue liquid conveying pipe (11) is connected with the biogas residue and liquid storage tank (14). The biogas residue and liquid storage tank (14) is connected with the overflow pipe (15) and the split inoculum conveying pipe (10) which are connected with the feeding and stirring tank (12). The bottom of the feeding and stirring tank (12) is connected with the feeding conveying pipe (13) which is connected with the biogas fermentation tank (1). The top of the hollow residue liquid conveying pipe (8) is connected with the pressurized air conveying pipe (4) which is connected with the air compression system (2).

2. The feeding and discharging process device of the biogas fermentation tank in the biogas engineering according to claim 1, characterized in that, The bottom of the positive and negative pressure suction and discharge residue liquid tank (5) is further connected with the residue liquid buffer tank (6). The bottom of the residue liquid conveying pipe (9) is inserted into the bottom of the residue liquid buffer tank (6).

3. The feeding and discharging process device of the biogas fermentation tank in the biogas engineering according to claim 1, characterized in that, The tank body of the biogas fermentation tank (1) is arranged with 1-23 sets of positive and negative pressure suction and discharge residue liquid tanks (5). Each positive and negative pressure suction and discharge residue liquid tank (5) is connected with the hollow residue liquid conveying pipe (8) through the residue liquid communication pipe (7), connected with the air compression system (2) through the negative pressure air suction pipe (3), and connected with the split inoculum conveying pipe (10) and the recycling residue liquid conveying pipe (11) through the residue liquid conveying pipe (9).

4. The feeding and discharging process device of the biogas fermentation tank in the biogas engineering according to claim 1, characterized in that, The top of the residue liquid conveying pipe (9) is connected with any one of the split branch pipe of the combination pipe fittings of the F-shaped tee joint (904) and the tee joint (901) connected with the elbow (902). The split branch pipe is connected with the split inoculum conveying pipe (10) and the recycling residue liquid conveying pipe (1).

5. The feeding and discharging process device of the biogas fermentation tank in the biogas engineering according to claim 4, characterized in that, Any one of the recycling residue liquid conveying pipe (11) and the split inoculum conveying pipe (10) is connected with the flow control valve (903).

6. The feeding and discharging process device of the biogas fermentation tank in the biogas engineering according to claim 1, characterized in that, The diameter of the split inoculum conveying pipe (10) is 30-85% of the diameter of the recycling residue liquid conveying pipe. The top of the split inoculum conveying pipe (10) is directly inserted into the feeding and stirring tank (12) and connected with a plurality of inoculum injection nozzles (101) which are arranged in parallel and inclined.

7. The feeding and discharging process device of the biogas fermentation tank in the biogas engineering according to claim 1, characterized in that, The connection between the transverse residue liquid communication pipe (7) and the hollow residue liquid conveying pipe (8) is any one of the vertical connection and the tangent connection structure. The end of the transverse residue liquid communication pipe (7) connected with the positive and negative pressure suction and discharge residue liquid tank (5) is connected with the elbow (701) with the outlet downward.

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