CN203112827U - High-concentration large-particle-straw biogas fermentation device - Google Patents

Abstract

The utility model relates to a high-concentration large-particle-straw biogas fermentation device which belongs to the energy field. The high-concentration large-particle-straw biogas fermentation device comprises a fermentation tank (11) and a liquid storage tank (1), wherein a feeding pipe (10) and a biogas pipe port (9) are arranged at the top of a tank body of the fermentation tank, and a deslagging port (7) is arranged at the bottom of the tank body; a gravity stock pusher (6) is mounted in the feeding pipe (10) and seals the feeding pipe (10); a circular platform-shaped annular slag baffle (14) is mounted at the upper part inside the tank body, the upper end of the annular slag baffle (14) is connected with an outlet of the feeding pipe (10), and the lower end of the annular slag baffle (14) is connected with the inner wall of the tank body; a liquid-slag separation board (16) is mounted at the lower part inside the tank body, sieve holes are formed in the liquid-slag separation board (16), and the periphery of the liquid-slag separation board (16) is connected with the inner wall of the tank body; a liquid discharge pipe (3) is arranged at the bottom of the fermentation tank (11); and a communication pipe (4) is mounted on the inner wall of the fermentation tank (11). The high-concentration large-particle-straw biogas fermentation device can directly digest large-particle straw, and is low in energy consumption, smooth in feeding and discharging, and low in output-input ratio.

Description

High concentration and large particle straw biogas fermentation device

technical field

The utility model belongs to the field of energy, in particular to a high-concentration and large-grain straw biogas fermentation device. the

Background technique

Crop stalks come from a wide range of sources, and the amount of resources is large. A large amount of stalks cannot be effectively treated, which brings a series of environmental problems. Straw biogas utilization can effectively solve this problem, and at the same time produce high-quality bioenergy—biogas, which has become one of the important means of straw resource utilization. The raw materials of existing straw continuous fermentation devices generally need to be pretreated such as crushing, because of their poor fluidity, mechanical stirring is usually required to achieve mass and heat transfer. The specific gravity of the straw is light, and it is easy to float up to form a hard shell after entering the fermentation device, which hinders the accumulation of biogas generated in the pond and reduces the utilization rate of raw materials. As a result, the material concentration of the current straw biogas continuous fermentation device is low, and the output is basically completed by mechanical equipment, which requires a large investment in equipment, high energy consumption, and low efficiency of anaerobic digestion for gas production. the

Contents of the invention

The purpose of this utility model is to overcome the defects of low material concentration and low raw material utilization rate in the prior art straw biogas continuous fermentation device, relying on mechanical equipment for output, large investment in equipment, high energy consumption, and low efficiency of anaerobic digestion and gas production. A high-concentration large-grain straw biogas fermentation device that can directly digest large-grain straw, has low energy consumption, smooth feed and discharge, and low input-output ratio. the

The purpose of this utility model is achieved through the following technical solutions:

The high-concentration and large-particle straw biogas fermentation device of the utility model is composed of a fermentation tank (11) and a liquid storage tank or a liquid storage tank (1). The fermentation tank (11) is a vertical tank body, and a feeding pipe is arranged on the top of the tank body. (10) and a valved biogas nozzle (9), the bottom of the tank is provided with a valved slag outlet (7), which is characterized in that a gravity pusher (6) is installed in the feed pipe (10), The feeding pipe (10) is closed by a gravity pusher (6); the top of the tank is provided with a return nozzle (5), and the return nozzle (5) passes through the circulation pump (2) and the liquid storage tank or the liquid storage tank ( 1) Connected; the upper part of the tank is provided with an overflow pipe (8) or/and a liquid level indicating element, the low point of the overflow pipe (8) is higher than the outlet of the feed pipe (10), and the high point is lower than the biogas nozzle The inlet of (9); the upper part of the tank is equipped with a circular platform-shaped slag retaining ring plate (14), the upper end of the slag retaining ring plate (14) is connected with the outlet of the feed pipe (10), and the lower end of the slag retaining ring plate (14) is connected to the tank The inner wall is connected, and the sieve hole is opened on the ring plate; the liquid slag separation plate (16) is installed on the lower part of the tank body, and the liquid slag separation plate (16) is installed obliquely, and the sieve hole is opened on the liquid slag separation plate (16). The lowest part of the liquid slag separation plate (16) is connected to the bottom of the slag outlet (7); the bottom of the fermenter (11) is provided with a drain pipe (3) with a valve, and the outlet of the drain pipe (3) is connected to the bottom of the slag outlet (7). The liquid storage tank or the liquid storage tank (1) corresponds to or is connected; the inner wall of the fermenter (11) is equipped with a connecting pipe (4), and the high end of the connecting pipe (4) is higher than the high point of the overflow pipe (8), and it is connected The bottom end of pipe (4) is positioned at the highest position of liquid slag separation plate (16).

In the above solution, the outlet of the overflow pipe (8) corresponds to or is connected to the liquid storage pool or the liquid storage tank (1). the

In the above scheme, the gravity pusher (6) and the feed pipe (10) are clearance fit, the gravity pusher (6) can slide freely in the feed pipe (10), and the gravity pusher (6) (6) The upper part and the upper part of the feed pipe (10) are provided with a blocking device to prevent the gravity pusher (6) from sliding into the fermenter (11) through the feed pipe (10). the

In the above solution, the taper of the slag retaining ring plate (14) is greater than 30°, and the inclination angle of the liquid slag separation plate (16) is greater than 15°. the

In the above scheme, the liquid storage pool or liquid storage tank (1) is provided with a sieve plate (18) or/and a porous slag frame, and the slag discharge port (7) corresponds to or connects with the liquid storage pool or liquid storage tank (1) . the

In the above solution, the liquid level indicating element is connected to the control element, the control element is connected to the valve of the slag discharge outlet (7), and the liquid level indicating element, the control element and the valve of the slag discharge outlet (7) form an automatic slag discharge unit. the

In the above scheme, a storage unit is provided above the feeding pipe (10), and a feeding hopper and a gravity pusher opening and closing element are arranged in the storage unit. The feeding hopper corresponds to the feeding pipe (10), and the gravity The opening and closing elements of the pusher are respectively connected with the gravity pusher (6) and the control element, and the storage unit, the gravity pusher (6) and the control element form an automatic feeding unit. the

The principle of the utility model is: through the design of the fermentation device, the fermentation material stays in the middle of the reactor to prevent the scum from floating and encrusting; the gravity drive device is designed to make the high-concentration fermentation material flow from It moves automatically from up to down; backflows the fermentation liquid from the bottom to the top, so that the main fermentation forms a pressure difference, promotes the uniform penetration of the fermentation liquid in the fermentation material, realizes the full contact between anaerobic microorganisms and the fermentation material, and promotes continuous and efficient anaerobic digestion. the

In the high-concentration and large-particle straw biogas fermentation device of the present invention, the fermentation tank is composed of four parts: a gas storage area, a water seal area, a main fermentation area, and a secondary fermentation area. The top is a gas storage area, and the bottom is a water seal area. The bottom of the feed pipe goes deep into the liquid surface of the water seal area to ensure the airtightness of the gas storage area. The slag retaining ring plate separates the water seal area and the main fermentation area to prevent the feed straw from floating up. At the same time, the fermentation liquid can enter the main fermentation area through the small holes of the ring plate. The taper of the slag retaining ring plate is greater than 30°, which is convenient for gravity pusher to push Fermentation material moves to the bottom of the main fermentation zone. The liquid slag separation plate separates the main fermentation area and the secondary fermentation area, preventing the fermentation straw from entering the secondary fermentation area. The fermentation liquid can enter the secondary fermentation area through the small holes of the liquid slag separation plate. The inclination angle of the liquid slag separation plate is greater than 15°, which is convenient for fermenting solids. The residue slides out. The overflow pipe is used to control the liquid level and prevent the fermentation liquid from entering the biogas pipe. The connecting pipe maintains the air pressure balance between the secondary fermentation area and the gas storage area, and prevents the reflux fermentation liquid from directly entering the secondary fermentation area through the connecting pipe. the

The beneficial effects of the utility model are as follows: (1) the utility model can directly digest large-grained straw, save the pretreatment process such as straw crushing, use gravity to push the fermentation material to flow, and save a lot of energy consumption; (2) the utility model can obviously Increase the concentration of fermentation materials in the fermentation device, control the fermentation materials under the water seal area, and effectively prevent the straw from floating and encrusting; (3) The utility model repeatedly refluxes the fermentation liquid from the bottom to the top, and the osmosis cycle of the fermentation liquid in the main fermentation area , so that the microorganisms can fully contact the fermentation material, which can significantly increase the volumetric gas production rate of the fermentation device; (4) The utility model can realize automatic solid-liquid separation of the fermentation residue and the fermentation liquid. Discharge, the fermentation residue slides along the liquid slag separation plate, and is discharged through the slag discharge port, so as to realize the smooth slag discharge of the fermentation device, so as to ensure the stable and long-term operation of the entire fermentation device. the

Therefore, the utility model overcomes the defects of low material concentration and low utilization rate of raw materials in the prior art straw biogas continuous fermentation device, relying on mechanical equipment for output, large investment in equipment, high energy consumption, and low efficiency of anaerobic digestion and gas production, and provides A high-concentration large-grain straw biogas fermentation device is developed that can directly digest large-grain straw, has low energy consumption, smooth feeding and discharging, and low input-output ratio. the

Description of drawings

Fig. 1 is the schematic diagram of the utility model. the

FIG. 2 is a schematic top view of FIG. 1 . the

Fig. 3 is a schematic diagram of the second embodiment of the utility model. the

Fig. 4 is a schematic diagram of the eighth embodiment of the utility model. the

In the drawings, 1: liquid storage pool or liquid storage tank, 2: circulation pump, 3: liquid discharge pipe, 4: connecting pipe, 5: return pipe mouth, 6: gravity pusher, 7: slag discharge port, 8: overflow pipe, 9: biogas nozzle, 10: feed pipe, 11: fermentation tank, 12: water seal area, 13: gas storage area, 14: slag retaining ring plate, 15: main fermentation area, 16: Liquid slag separation plate, 17: secondary fermentation area, 18: sieve plate. the

Detailed ways

The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments, but the utility model is not limited to the embodiments. the

Embodiment one

The high-concentration and large-particle straw biogas fermentation device of this example is shown in Figure 1 and Figure 2, and is made up of fermentor 11 and liquid storage tank 1, and fermentor 11 is a vertical tank body, and tank body top is provided with feeding pipe 10 and Biogas nozzle 9 with valve, slag discharge port 7 with valve is provided at the bottom of the tank, the feature is that a gravity pusher 6 is installed in the feed pipe 10, and the feed pipe 10 is closed by the gravity pusher 6 The top of the tank body is provided with a return nozzle 5, and the return nozzle 5 is connected to the liquid storage tank 1 through a circulation pump 2; The outlet, the high point is lower than the inlet of the biogas pipe mouth 9; the upper part of the tank body is equipped with a circular truncated slag retaining ring plate 14, the upper end of the slag retaining ring plate 14 is connected with the outlet of the feed pipe 10, and the lower end of the slag retaining ring plate 14 is connected to the inside of the tank. The wall is connected, and the sieve hole is opened on the ring plate; the liquid slag separation plate 16 is installed in the lower part of the tank body, and the liquid slag separation plate 16 is installed obliquely. The lowest part of 16 is connected to the bottom of the slag outlet 7; the bottom of the fermenter 11 is provided with a drain pipe 3 with a valve, and the outlet of the drain pipe 3 corresponds to the liquid storage tank 1; the inner wall of the fermenter 11 is equipped with a connecting pipe 4 , the high end of the connecting pipe 4 is higher than the high point of the overflow pipe 8, and the bottom end of the connecting pipe 4 is located at the highest position of the liquid slag separating plate 16.

In this example, the outlet of the overflow pipe 8 corresponds to the liquid storage tank 1 . the

The gravity pusher 6 and the feed pipe 10 are clearance fit, the gravity pusher 6 can slide freely in the feed pipe 10, the upper part of the gravity pusher 6 and the upper part of the feed pipe 10 are provided with a blocking device, Prevent the gravity pusher 6 from sliding into the fermenter 11 through the feed pipe 10 . the

The taper of the slag retaining ring plate 14 is greater than 30°, and the inclination angle of the liquid slag separation plate 16 is greater than 15°. the

The working process of the high-concentration and large-particle straw biogas fermentation device in this example is as follows:

The fermentation tank of this example is divided into gas storage area 13, water sealing area 12, main fermentation area 15, secondary fermentation area 17 four parts. After the fermented straw is evenly mixed with the fermented liquid in the liquid storage tank 1, it enters the main fermentation zone 15 through the feed pipe 10 under the push of the gravity pusher 6 for anaerobic digestion. With the combined effect of the slag retaining ring plate 14 and the gravity pusher 6, the feeding straw is always in the lower part of the water seal area 12, which effectively prevents the straw from forming a floating layer. Under the action of the gravity of the device 6, the fermented material moves to the lower part of the main fermentation zone 15. With the increase of feeding times, the fermented straw is gradually pushed to the bottom of the fermenter. At this time, the straw raw material has been fully fermented and reached the end of fermentation. , under the impetus of the next feed, slide along the liquid slag separation plate 16 to the slag outlet 7.

The leachate from the fermented straw enters the secondary fermentation zone 17 through the slag separation plate 16 to continue anaerobic digestion. The biogas produced by anaerobic digestion enters the gas storage area 13 for storage, and then is discharged from the biogas nozzle 9 for use. the

During the anaerobic digestion process, the fermentation liquid in the secondary fermentation zone 17 is regularly discharged to the liquid storage tank 1, pumped to the top of the fermentation tank 11 by the circulation pump 2, and enters the water seal zone 12 through the return pipe 5, so that the water seal zone 12 and A liquid level difference is formed between the connecting pipes 4, and the fermented liquid forms an osmotic pressure in the main fermentation zone 15, which promotes the seepage and flow of the fermented liquid in the fermented straw, promotes sufficient contact between microorganisms and fermented materials, and improves the efficiency of anaerobic digestion. the

The liquid level height of water seal area 12 is set by the highest point of overflow pipe 8. the

After the anaerobic digestion of the fermentation device is completed, the fermentation liquid and fermentation residue are sequentially discharged, and the operation method is as follows: close the biogas nozzle 9, open the discharge pipe 3, discharge the fermentation liquid in the fermentation tank 11, and enter the storage liquid Pool 1 is temporarily stored, and after the fermentation liquid is discharged, the slag discharge port 7 is opened, and the straw fermentation residue near the bottom of the main fermentation area 15 and the slag discharge port 7 moves along the liquid slag separation plate from The slag outlet 7 discharges the fermenter 11 . the

The results show that the gravity-driven high-concentration and large-particle straw biogas fermentation device of the embodiment has low energy consumption and high anaerobic digestion efficiency, can effectively solve the problem of discharging materials, realize smooth discharging, and ensure the continuous operation of the anaerobic digestion system. , Long-term and stable operation. the

Example two

The high-concentration and large-particle straw biogas fermentation device of this example is shown in Figure 3, except that the liquid storage tank 1 is provided with a sieve plate 18 and a porous slag frame, and the slag discharge port 7 corresponds to the liquid storage tank 1, and the rest is the same as the first embodiment.

The feeding and slagging process of the high-concentration and large-particle straw biogas fermentation device in this example is as follows:

When the liquid level in the fermentation tank 11 reaches a certain height and slag discharge is required, the biogas nozzle 9 is closed and the slag discharge port 7 is opened. Under the action, the fermentation tank 11 is discharged from the slag discharge port 7 along the liquid slag separation plate, enters the liquid storage tank 1, and the liquid slag is separated through the sieve plate 18 and the porous slag frame, and the fermentation liquid enters the lower part of the liquid storage tank 1, and the residue remains on the sieve plate 18 and stay in the porous slag frame. Driven by the fermentation liquid, the slag discharge is very convenient. When the liquid level of the water seal area 12 was close to the bottom of the feed pipe 10, the slag outlet 7 was closed, so that the gas storage area 13 could be kept without air from entering. Then, open feed pipe 10, add new material. Turn on the circulation pump 2 again, and send the fermented liquid in the liquid storage tank 1 back to the fermenter 11.

All the other processes are the same as in embodiment one. the

Embodiment three

The high-concentration and large-grain straw biogas fermentation device of this example is the same as the second embodiment except that the upper part of the fermenter 11 is provided with a liquid level indicating element.

Embodiment four

The high-concentration and large-grain straw biogas fermentation device of this example is the same as the third embodiment except that no overflow pipe is provided on the upper part of the fermenter 11.

Embodiment five

In the high-concentration and large-particle straw biogas fermentation device in this example, the liquid level indicating element is connected to the control element, the control element is connected to the 7 valves of the slag discharge port, and the liquid level indicator, control element and 7 valves of the slag discharge port form an automatic slag discharge unit. , all the other are with embodiment four.

The slag discharge process of the high-concentration and large-particle straw biogas fermentation device in this example is as follows:

When the liquid level indicating element shows that the liquid level has risen to the set height, a signal is sent to the control element, and the control element sends an instruction to open the valve of the slag discharge port 7 to start slag discharge. When the liquid level indicating element shows that the liquid level drops to the set height, a signal is sent to the control element, and the control element sends an instruction to close the valve of the slag discharge port 7, and the slag discharge ends.

All the other processes are the same as in embodiment two. the

Embodiment six

In the high-concentration and large-particle straw biogas fermentation device of this example, a storage unit is provided above the feeding pipe 10, and a feeding hopper and a gravity pusher opening and closing element are arranged in the storage unit, and the feeding hopper corresponds to the feeding pipe 10. The opening and closing elements of the gravity pusher are respectively connected with the gravity pusher 6 and the control element, except that the storage unit, the gravity pusher 6 and the control element form an automatic feeding unit, and the rest are the same as in the fourth embodiment.

The feeding process of the high-concentration and large-particle straw biogas fermentation device in this example is as follows:

When the slag discharge is completed, the control element sends an instruction to the opening and closing element of the gravity pusher, and the gravity pusher 6 is raised, and the feeding straw stored in the hopper enters the feeding pipe 10. After the set time is reached, The control element sends an instruction to the opening and closing element of the gravity pusher, and the gravity pusher 6 is put down, and the feeding straw is pushed by the gravity pusher 6, and enters the main fermentation area 15 through the feeding pipe 10, and the feeding process is completed .

All the other processes are the same as in embodiment two. the

Embodiment seven

In the high-concentration and large-particle straw biogas fermentation device of this example, a storage unit is provided above the feeding pipe 10, and a feeding hopper and a gravity pusher opening and closing element are arranged in the storage unit, and the feeding hopper corresponds to the feeding pipe 10. The opening and closing elements of the gravity pusher are respectively connected with the gravity pusher 6 and the control element, except that the storage unit, the gravity pusher 6 and the control element form an automatic feeding unit, and the rest are the same as in the fifth embodiment.

The feeding process of the high-concentration and large-particle straw biogas fermentation device in this example is as follows:

When the slag discharge is completed, the control element sends an instruction to the opening and closing element of the gravity pusher, and the gravity pusher 6 is raised, and the feeding straw stored in the hopper enters the feeding pipe 10. After the set time is reached, The control element sends an instruction to the opening and closing element of the gravity pusher, and the gravity pusher 6 is put down, and the feeding straw is pushed by the gravity pusher 6, and enters the main fermentation area 15 through the feeding pipe 10, and the feeding process is completed .

All the other processes are the same as in Embodiment five. the

Embodiment eight

The high-concentration and large-particle straw biogas fermentation device of this example is shown in Figure 4, except that the liquid storage tank 1 is used, the slag discharge port 7, the liquid discharge pipe 3 and the overflow pipe 8 are connected to the liquid storage tank, and the rest are the same as in the third embodiment. .

Embodiment nine

The high-concentration and large-grain straw biogas fermentation device of this example is the same as the third embodiment except that one liquid storage tank is provided with a sieve plate 18 .

Embodiment ten

The high-concentration and large-grain straw biogas fermentation device of this example is the same as that of the third embodiment except that one of the liquid storage tanks is provided with a porous slag frame.

Claims (7)

1. A high-concentration and large-particle straw biogas fermentation device, which consists of a fermentation tank (11) and a liquid storage tank or a liquid storage tank (1). The fermentation tank (11) is a vertical tank with a feeder on the top of the tank. Pipe (10) and biogas nozzle (9) with valve, slag discharge port (7) with valve is provided at the bottom of the tank, and the feature is that a gravity pusher (6) is installed in the feed pipe (10) , the feed pipe (10) is closed by a gravity pusher (6); the top of the tank is provided with a return nozzle (5), and the return nozzle (5) passes through the circulation pump (2) and the liquid storage pool or liquid storage tank (1) are connected; the upper part of the tank is provided with an overflow pipe (8) or/and a liquid level indicating element, the low point of the overflow pipe (8) is higher than the outlet of the feed pipe (10), and the high point is lower than the biogas pipe The inlet of the mouth (9); the upper part of the tank is equipped with a circular truncated slag retaining ring plate (14), the upper end of the slag retaining ring plate (14) is connected to the outlet of the feed pipe (10), and the lower end of the slag retaining ring plate (14) is connected to the outlet of the feed pipe (10). The inner wall of the tank is connected, and the sieve hole is opened on the ring plate; the liquid slag separation plate (16) is installed on the lower part of the tank body, and the liquid slag separation plate (16) is installed obliquely, and the sieve hole is opened on the liquid slag separation plate (16). The inner wall is connected, and the lowest part of the liquid slag separation plate (16) is connected with the bottom of the slag outlet (7); the bottom of the fermenter (11) is provided with a drain pipe (3) with a valve, and the outlet of the drain pipe (3) Corresponding to or connected to the liquid storage tank or liquid storage tank (1); the inner wall of the fermenter (11) is equipped with a connecting pipe (4), and the high end of the connecting pipe (4) is higher than the high point of the overflow pipe (8). The bottom end of the connecting pipe (4) is positioned at the highest position of the liquid slag separation plate (16). 2. The high-concentration and large-particle straw biogas fermentation device according to claim 1, characterized in that the outlet of the overflow pipe (8) corresponds to or is connected to the liquid storage tank or the liquid storage tank (1). 3. The high-concentration and large-particle straw biogas fermentation device according to claim 1, characterized in that the gravity pusher (6) and the feeding pipe (10) are in clearance fit, and the gravity pusher (6) It can slide freely in the feed pipe (10), and the upper part of the gravity pusher (6) and the upper part of the feed pipe (10) are provided with a locking device to prevent the gravity pusher (6) from passing through the feed pipe (10) ) into the fermenter (11). 4. The high-concentration and large-particle straw biogas fermentation device according to claim 1, characterized in that the taper of the slag retaining ring plate (14) is greater than 30°, and the inclination angle of the liquid slag separation plate (16) is greater than 15°. 5. The high-concentration and large-particle straw biogas fermentation device according to claim 1, characterized in that the liquid storage tank or liquid storage tank (1) is equipped with a sieve plate or/and a porous slag frame, and a slag discharge port (7) Corresponding to or connected with the liquid storage tank or the liquid storage tank (1). 6. The high-concentration and large-particle straw biogas fermentation device according to claim 1, characterized in that the liquid level indicating element is connected to the control element, the control element is connected to the slag discharge port (7) valve, the liquid level indicating element, the control element The components and the slag outlet (7) valve form an automatic slag discharge unit. 7. The high-concentration and large-particle straw biogas fermentation device according to claim 1, characterized in that a storage unit is arranged above the feeding pipe (10), and a feeding hopper and a gravity pusher are arranged in the storage unit The opening and closing elements, the feeding hopper corresponds to the feeding pipe (10), the opening and closing elements of the gravity pusher are respectively connected with the gravity pusher (6) and the control element, the storage unit, the gravity pusher (6) And the control element composes the automatic feeding unit.

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