Device and method for preparing hydrogen alkane through kitchen waste and straw layered anaerobic fermentation

Abstract

The invention discloses a device and method for preparing hydrogen alkane through layered anaerobic fermentation of kitchen waste and straw, and relates to the technical field of biomass fermentation, the device comprises a tank body, and a gas production device, a stirring device and a cleaning device are arranged in the tank body. The gas production device comprises a hydrogen production device and a methane production device; the methane production device comprises a second feeding hole, a methane production tank and a methane outlet. The hydrogen production device comprises a first feed port, a hydrogen production tank, a hydrogen outlet and a liquid relief port, the liquid relief port is communicated with the hydrogen production tank and the methane production tank, and the hydrogen production tank is arranged in the methane production tank. Treated kitchen waste and hydrogen-producing inoculum are poured into a hydrogen-producing tank through a first feeding port, treated straw and methane-producing inoculum are poured into a methane-producing tank through a second feeding port, the two fermentation tanks are stirred by a paddle, and acid in the hydrogen-producing tank can quickly flow into the methane-producing tank through a liquid transferring port. The whole device realizes efficient coupling of hydrogen production through kitchen waste anaerobic fermentation and methane production through straw anaerobic fermentation, and is high in fermentation efficiency and strong in operability.

Description

Technical Field

[0001] The invention relates to the technical field of biomass fermentation. Background Art

[0002] Anaerobic fermentation technology is an effective method to convert biomass waste such as food waste and straw into HYTHANE. Food waste is considered an ideal substrate for anaerobic fermentation hydrogen production because of its high hydrogen content and rich sugars that are easily hydrolyzed by microorganisms. However, it is also inevitable that volatile fatty acids such as acetic acid will accumulate due to the fast hydrolysis rate, resulting in a low hydrogen production rate.

[0003] Compared with food waste, straw of the same quality has a higher carbon content, so it is more suitable as a substrate for anaerobic fermentation to produce methane. However, due to the nutritional specificity of methanogens, their growth and metabolic rates are much lower than those of other microorganisms, resulting in a low methane production rate. If the volatile fatty acids such as acetic acid accumulated during the anaerobic fermentation of food waste to produce hydrogen are transferred to the straw anaerobic fermentation methane production system in a timely manner, the acid inhibition effect caused by excessive accumulation of volatile fatty acids can be alleviated, and directly available nutrients can be provided for methanogens, thereby helping to improve the hydrogen production rate of food waste and the methane production rate of straw. Existing hydrane preparation devices mostly use substrate full mixing fermentation devices: food waste and straw are completely mixed together, and hydrane is generated after a series of reactions. Although this device has low investment and operating costs, it has obvious defects such as long start-up time, unstable system operation, low gas production, many impurity gases, and great safety hazards. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problems of long startup time, unstable system operation, low gas production, much impurity gas and great safety hazard of the above-mentioned HYDHT preparation device. The first purpose of the present invention is to provide a HYDHT preparation device by anaerobic fermentation of kitchen waste and straw, which can ferment the kitchen waste and straw separately and mix the fermentation products. It has stable operation, stable gas production, little impurity gas, and is safe and reliable.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0006] A device for preparing hydrane by layered anaerobic fermentation of kitchen waste and straw, comprising a tank body, wherein a gas generating device, a stirring device and a cleaning device are arranged in the tank body;

[0007] The gas production device comprises a hydrogen production device and a methane production device, the methane production device comprises a second feed inlet, a methane production tank and a methane outlet, the hydrogen production device comprises a first feed inlet, a hydrogen production tank, a hydrogen outlet and a liquid transfer port, the liquid transfer port is connected to the hydrogen production tank and the methane production tank, and the hydrogen production tank is arranged in the methane production tank;

[0008] The stirring device comprises an AC motor, a stirring column, a primary stirring paddle, a secondary stirring paddle and paddles, wherein the primary stirring paddle extends into the hydrogen production tank, and the secondary stirring paddle extends into the methane production tank;

[0009] The cleaning device includes a rotating high-pressure cleaning nozzle, an inclined rod and a horizontal push-pull rod. The rotating high-pressure cleaning nozzle is arranged in the hydrogen production tank and the methane production tank. The inclined rod is arranged at the lower end opening of the hydrogen production tank. The horizontal push-pull rod is connected to the inclined rod and controls the opening and closing of the inclined rod.

[0010] Through the above scheme, a tank body is provided, a methane production tank and a hydrogen production tank placed in the methane production tank are provided, and a pipetting port is provided to connect the hydrogen production tank and the methane production tank. The hydrogen production tank and the methane production tank are provided separately, and the processed kitchen waste and the hydrogen production inoculum are poured into the hydrogen production tank through the first feed port, and the processed straw and the methane production inoculum are poured into the methane production tank through the second feed port. At the same time, the AC motor is turned on to stir the two fermentation tanks through the first-level stirring paddle, the second-level stirring paddle and the paddle, and the acid in the hydrogen production tank can quickly flow into the methane production tank through the pipetting port, without A conduit is required, and the gases generated by the two tanks are collected through the hydrogen outlet and the methane outlet. In the later stage of the reaction, by setting an inclined rod and a horizontal push-pull rod device, most of the fermentation mixture in the hydrogen production tank and the methane production tank flows out of the tank under the action of gravity, so that the fermentation mixture in the hydrogen production tank and the methane production tank can be quickly cleaned, and each tank can be cleaned with a rotating high-pressure cleaning nozzle, which is convenient to operate and saves time. The entire device realizes the efficient coupling of anaerobic fermentation of kitchen waste to produce hydrogen and anaerobic fermentation of straw to produce methane, with high fermentation efficiency, reasonable design, and strong operability. The present invention can not only ensure the smooth operation of the device to the greatest extent, but also effectively improve the hydrogen and methane yields.

[0011] Furthermore, the stirring column is a hollow steel pipe structure, the output shaft of the AC motor is connected to the primary stirring paddle and the secondary stirring paddle through a long rod, and the stirring speed of the stirring device is achieved by controlling the rotation speed of the AC motor installed on the top of the tank body. During stirring, the stirring column remains stable and the paddles rotate.

[0012] Through the above scheme, the stirring column is a hollow steel pipe structure, which is convenient for setting the pipetting port to communicate liquid and gas, and an AC motor is set to drive the blades to rotate and maintain the fermentation state.

[0013] Furthermore, the pipette port is arranged on the side wall of the stirring column at the lower end of the hydrogen production tank, the first-level stirring paddle and the second-level stirring paddle are connected by a stainless steel hollow steel pipe, the first-level stirring paddle adopts a plurality of small blades of exactly the same size to stir the fermentation mixture in the hydrogen production tank, and the second-level stirring paddle adopts a plurality of large blades of exactly the same size to stir the fermentation mixture in the methane production tank.

[0014] Through the above scheme, two specifications of small blades and large blades are set, which is convenient for stirring according to the different contents of the hydrogen production tank and the methane production tank, and has a reasonable structure and stable operation.

[0015] Furthermore, a first hydrogen outlet is provided at the end of the hydrogen outlet, an exhaust fan is installed on the first outlet, a second outlet is provided on the first outlet at the exhaust fan outlet end, and an air control valve is provided on the second outlet. The methane outlet is configured in the same manner as the hydrogen outlet, and is also provided with the exhaust fan and the air control valve.

[0016] Through the above scheme, by arranging exhaust fans and air control valves at the hydrogen outlet and the methane outlet, it is convenient to seal and vacuum the tank body, to form an anaerobic fermentation environment, and to collect the subsequent fermentation gas. It has a "dual-purpose" function. It can be regarded as a vacuum port to extract the air in the hydrogen production tank and the methane production tank to create an anaerobic environment, and can also be regarded as a gas extraction port to quickly and synchronously collect the generated hydrogen and methane.

[0017] Furthermore, covers are installed at the first feed inlet and the second feed inlet.

[0018] Through the above scheme, the lid is provided to facilitate sealing of the first feed inlet and the second feed inlet, so as to facilitate fermentation and vacuuming.

[0019] Furthermore, the horizontal push-pull rod includes a first left horizontal push-pull rod and a first right horizontal push-pull rod arranged below the hydrogen production tank, and also includes a second left horizontal push-pull rod and a second right horizontal push-pull rod arranged below the methane production tank. The oblique rod is symmetrically arranged at the lower end opening of the hydrogen production tank, and the upper end of the oblique rod is connected to the side wall of the hydrogen production tank through a hinge structure. The middle ends of the oblique rods on both sides are respectively connected to the first left horizontal push-pull rod and the first right horizontal push-pull rod through pull rings. The lower end of the oblique rod is connected to the stirring column through a magnetic attraction structure, and a sealing ring made of polytetrafluoroethylene is installed under the magnetic attraction structure; the second left horizontal push-pull rod and the second right horizontal push-pull rod are connected through a Dingmao structure.

[0020] Through the above scheme, when the fermentation is completed, by pulling the first left horizontal push-pull rod and the first right horizontal push-pull rod, pulling the second left horizontal push-pull rod and the second right horizontal push-pull rod, the inclined rod is opened along the lower end, and the bottom of the methane production tank is opened. The hydrogen production tank falls into the methane production tank under the action of gravity and flows out of the tank body with the contents of the methane production tank under the action of gravity. Then, the inside of the tank body is cleaned by a cleaning device, and then the lower end of the inclined rod is connected to the stirring column through a magnetic suction structure and sealed by a sealing ring, and the second left horizontal push-pull rod and the second right horizontal push-pull rod are pushed back in the reverse direction to complete the reset, which is convenient for the next hydrogen ane preparation test.

[0021] Furthermore, the rotating high-pressure cleaning nozzle is installed on the top and side wall of the hydrogen production tank, and the rotating high-pressure cleaning nozzle is also installed on the side wall of the methane production tank. Each of the rotating high-pressure cleaning nozzles is connected to a branch water pipe and is collected to the main water pipe outside the tank body.

[0022] Through the above scheme, the water pipe valve is opened, and the fermentation mixture remaining in the hydrogen production tank and the methane production tank is cleaned by rotating the high-pressure cleaning nozzle. After the cleaning is completed, the water pipe valve is closed, and the next batch of hydrogen ane preparation test can be carried out after air drying.

[0023] The present invention provides a method for preparing HYTHANE by anaerobic fermentation of kitchen waste and straw, the specific steps of which include:

[0024] Step 1, open the cover on the first feed port, pour the processed food waste and hydrogen-producing inoculum into the hydrogen-producing tank through the first feed port; open the exhaust fan of the first hydrogen outlet and the air control valve of the second outlet to extract the air in the hydrogen-producing tank, and when the air pressure reaches 0.05MPa, stop the air extraction and close the air control valve; connect the air collection bag to the second hydrogen outlet, open the air control valve and the AC motor, and anaerobically culture the fermentation mixture in the hydrogen-producing tank for 6-8 days;

[0025] Step 2, open the lid on the second feed port, pour the processed straw and methanogenic inoculum into the methanogenic tank through the second feed port; open the exhaust fan of the first methane outlet and the air control valve of the second outlet to extract the air in the methanogenic tank, and when the air pressure reaches 0.05MPa, stop the air extraction and close the air control valve; connect the air collection bag to the second methane outlet, open the air control valve and the AC motor, and anaerobically culture the fermentation mixture in the methanogenic tank for 25-30 days;

[0026] Step 3, close the gas control valve and the AC motor, pull the first left horizontal push-pull rod and the second left horizontal push-pull rod to the left in sequence, and pull the first right horizontal push-pull rod and the second right horizontal push-pull rod to the right, so that most of the fermentation mixture in the hydrogen production tank and the methane production tank flows out of the tank body under the action of gravity;

[0027] Step 4, open the water pipe valve, and clean the fermentation mixture remaining in the hydrogen production tank and the methane production tank by rotating the high-pressure cleaning nozzle. After cleaning, close the water pipe valve, and after air drying, the next batch of hydrogen ane preparation test can be carried out.

[0028] Furthermore, in step 1, after the kitchen waste is dried in an oven at 60°C, it is poured into the hydrogen production tank together with the hydrogen production inoculum heated at 100°C for 30 minutes, and the initial fermentation pH is adjusted to 6.0-6.5 and the fermentation temperature is 35°C.

[0029] Furthermore, in step 2, the straw is dried in an oven at 60°C and then crushed and sieved, and straw particles with a particle size of 0.85 mm are poured into a methanogenic tank together with the methanogenic inoculum, and the initial fermentation pH is adjusted to 6.8-7.2 and the fermentation temperature is 35°C.

[0030] The beneficial effects of the present invention are as follows:

[0031] 1. The device provided by the present invention can realize the efficient coupling of anaerobic fermentation of kitchen waste to produce hydrogen and anaerobic fermentation of straw to produce methane, with high fermentation efficiency, reasonable design and strong operability. The present invention can not only ensure the smooth operation of the device to the greatest extent, but also effectively improve the yield of hydrogen and methane.

[0032] 2. The acid in the hydrogen production tank can quickly flow into the methane production tank through the pipette port without the need for a catheter, with a high degree of automation and low investment and construction costs.

[0033] 3. The hydrogen and methane outlets have a "dual-purpose" function. They can be regarded as an air extraction port to extract the air in the hydrogen production tank and the methane production tank to create an anaerobic environment, and can also be regarded as an air intake port to quickly and synchronously collect the generated hydrogen and methane.

[0034] 4. By setting up the inclined rod and horizontal push-pull rod device, the fermentation mixture in the hydrogen production tank and the methane production tank can be quickly cleaned, which is convenient for operation, saves time, and improves the practicality and convenience of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the present invention;

[0036] Figure 2 It is a partial enlarged view of the pipetting port of the present invention;

[0037] Figure 3 It is a partial enlarged view of the second left horizontal push-pull rod and the second right horizontal push-pull rod of the present invention.

[0038] In the figure: 1, gas production device; 2, stirring device; 4, hydrogen production device; 5, methane production device; 6, AC motor; 7, stirring column; 8, first-stage stirring paddle; 9, second-stage stirring paddle; 10, blade; 101, small blade; 102, large blade; 11, rotating high-pressure cleaning nozzle; 12, inclined rod; 13, horizontal push-pull rod; 131, first left horizontal push-pull rod; 132, first right horizontal push-pull rod; 133, second left horizontal push-pull rod; 134, second right Horizontal push-pull rod; 14, first feed inlet; 15, hydrogen production tank; 16, hydrogen outlet; 17, pipetting port; 18, stainless steel rod; 19, tank body; 20, metal filter; 21, second feed inlet; 22, methane production tank; 23, methane outlet; 24, lid; 25, first outlet; 26, exhaust fan; 27, second outlet; 28, air control valve; 29, hinge structure; 30, pull ring; 31, magnetic structure; 32, sealing ring; 33, Dingmao structure. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Example 1

[0042] The present invention provides a device for preparing hydrantane by anaerobic fermentation of kitchen waste and straw. Figure 1-3 As shown, it includes a gas production device 1, a stirring device 2 and a cleaning device; the gas production device 1 includes a hydrogen production device 4 and a methane production device 5, the stirring device 2 includes an AC motor 6, a stirring column 7, a primary stirring paddle 8, a secondary stirring paddle 9 and a blade 10, and the cleaning device includes a rotating high-pressure cleaning nozzle 11, a tilting rod 12 and a horizontal push-pull rod 13.

[0043] Reference Figure 1 and Figure 2The hydrogen production device 4 includes a first feed inlet 14, a hydrogen production tank 15, a hydrogen outlet 16 and a pipette port 17. The hydrogen production tank 15 is connected to the side wall of the tank body 19 through a stainless steel rod 18, and the pipette port 17 is connected to a metal filter 20 with a pore size of 0.075 mm; the methane production device 5 includes a second feed inlet 21, a methane production tank 22 and a methane outlet 23. The methane production tank 22 is connected to the side wall of the tank body 19 through a stainless steel rod 18.

[0044] The tank body 19 is provided, a methane production tank 22 and a hydrogen production tank 15 placed in the methane production tank 22 are provided, and a pipette port 17 is provided to connect the hydrogen production tank 15 and the methane production tank 22. The hydrogen production tank 15 and the methane production tank 22 are provided separately, and the processed kitchen waste and the hydrogen production inoculum are poured into the hydrogen production tank 15 through the first feed port 14, and the processed straw and the methane production inoculum are poured into the methane production tank 22 through the second feed port 21. At the same time, the AC motor 6 is turned on to stir the two fermentation tanks through the primary stirring paddle 8, the secondary stirring paddle 9 and the blade 10, and the acid in the hydrogen production tank 15 can quickly flow into the methane production tank 22 through the pipette port. , no need to use a conduit, and the gas produced by the two tanks 19 is collected through the hydrogen outlet 16 and the methane outlet 23. In the later stage of the reaction, the inclined rod 12 and the horizontal push-pull rod 13 are set, and most of the fermentation mixture in the hydrogen production tank 15 and the methane production tank 22 flows out of the tank 19 under the action of gravity, so that the fermentation mixture in the hydrogen production tank 15 and the methane production tank 22 can be quickly cleaned, and the rotating high-pressure cleaning nozzle 11 is used to clean each tank 19, which is convenient to operate and saves time. The whole device realizes the efficient coupling of anaerobic fermentation of kitchen waste to produce hydrogen and anaerobic fermentation of straw to produce methane, with high fermentation efficiency, reasonable design and strong operability. The present invention can not only ensure the smooth operation of the device to the greatest extent, but also effectively improve the hydrogen and methane yields.

[0045] Reference Figure 1 and Figure 2 A cover 24 is installed at the first feed port 14 and the second feed port 21; a first hydrogen outlet 25 is provided at the end of the hydrogen outlet 16, an exhaust fan 26 is installed on the first outlet 25, a second outlet 27 is provided on the first outlet 25 at the output end of the exhaust fan 26, and an air control valve 28 is provided on the second outlet 27. The methane outlet 23 is configured in the same way as the hydrogen outlet 16, and is also provided with the exhaust fan 26 and the air control valve 28. The first hydrogen and methane outlets 25 are installed with exhaust fans 26, and the second outlets 27 are installed with air control valves 28. The methane outlet 23 is configured in the same way as the hydrogen outlet 16, and is also provided with exhaust fans 26 and air control valves 28.

[0046] Therefore, a lid is provided to facilitate sealing of the first feed port 14 and the second feed port 21, and to facilitate fermentation and vacuuming. By providing an exhaust fan 26 and an air control valve 28 at the hydrogen outlet 16 and the methane outlet 23, it is convenient to seal and vacuumize the tank body 19, to form an anaerobic fermentation environment, and to facilitate the subsequent fermentation gas collection. It has a "dual-purpose" function, which can be regarded as an air extraction port to extract the air in the hydrogen production tank 15 and the methane production tank 22 to create an anaerobic environment, and can also be regarded as an air intake port to quickly and synchronously collect the generated hydrogen and methane.

[0047] In order to facilitate stirring and gas-liquid exchange, refer to Figure 1 The stirring speed of the stirring device 2 is achieved by controlling the rotation speed of the AC motor 6 installed on the top of the tank body 19. During stirring, the stirring column 7 does not move, and only the paddle 10 rotates.

[0048] Preferably, the primary stirring paddle 8 and the secondary stirring paddle 9 are connected by a stainless steel hollow steel pipe. The primary stirring paddle 8 uses eight small blades 101 of exactly the same size to stir the fermented mixture in the hydrogen production tank 15, and the secondary stirring paddle 9 uses eight large blades 102 of exactly the same size to stir the fermented mixture in the methane production tank 22. The stirring column is a hollow steel pipe structure, which is convenient for setting a pipette port for liquid-gas communication. An AC motor is provided to drive the blades to rotate and maintain the fermentation state. Two specifications of small blades and large blades are provided, which are convenient for stirring according to the different contents of the hydrogen production tank 15 and the methane production tank 22. The structure is reasonable and the operation is stable.

[0049] Preferably, the rotating high-pressure cleaning nozzle 11 is installed on the top and side wall of the hydrogen production tank 15 and the side wall of the methane production tank 22, and each nozzle 11 is connected to a branch water pipe, and all the branch water pipes are connected to the main water pipe outside the tank body 19. Open the water pipe valve, and clean the fermentation mixture remaining in the hydrogen production tank 15 and the methane production tank 22 by rotating the high-pressure cleaning nozzle. After cleaning, close the water pipe valve, and after air drying, the next batch of HYTHANE preparation test can be carried out.

[0050] Preferred reference Figure 1 and Figure 2The upper end of the inclined rod 12 is connected to the left and right walls of the hydrogen production tank 15 through a hinge structure 29, the middle end is connected to the first left horizontal push-pull rod 131 and the first right horizontal push-pull rod 132 through a pull ring 30, and the lower end is connected to the stirring column 7 through a magnetic structure 31, which is a common electromagnetic adsorption structure and only shows the position in the figure. A sealing ring 32 made of polytetrafluoroethylene is installed under the magnetic structure 31; the horizontal push-pull rod 13 is also arranged under the methane production tank 22, including a second left horizontal push-pull rod 133 and a second right horizontal push-pull rod 134 arranged under the methane production tank 22, the second left horizontal push-pull rod 133 and the second right horizontal push-pull rod 134 are arranged at the bottom of the methane production tank 22 and are connected through a Dingmao structure 33.

[0051] Therefore, when the fermentation is completed, by pulling the first left horizontal push-pull rod and the first right horizontal push-pull rod, pulling the second left horizontal push-pull rod and the second right horizontal push-pull rod, the inclined rod is opened along the lower end, and the bottom of the methane production tank 22 is opened. The hydrogen production tank 15 falls into the methane production tank 22 under the action of gravity and flows out of the tank body 19 with the contents of the methane production tank 22 under the action of gravity. Then, the inside of the tank body 19 is cleaned by a cleaning device, and then the lower end of the inclined rod is connected to the stirring column through a magnetic suction structure and sealed by a sealing ring, and the second left horizontal push-pull rod and the second right horizontal push-pull rod are pushed back in reverse to complete the reset, which is convenient for the next hydrogen ane preparation test.

[0052] Based on the same inventive concept, the present invention also provides a method for using a device for preparing HYTHANE by anaerobic fermentation of kitchen waste and straw, comprising the following steps:

[0053] Step (1): Open the cover 24 of the first feed port 14, pour the processed food waste (dried in a 60°C oven) and hydrogen production inoculum (heated at 100°C for 30 minutes) into the hydrogen production tank 15 through the first feed port 14; open the exhaust fan 26 of the first hydrogen outlet 25 and the air control valve 28 of the second outlet 27 to extract the air in the hydrogen production tank 15. When the air pressure reaches 0.05MPa, stop exhausting and close the air control valve 28; connect the air collection bag to the second hydrogen outlet 27, open the air control valve 28 and the AC motor 6, and anaerobically culture the fermentation mixture in the hydrogen production tank 15 for 6-8 days. Adjust the initial pH of the fermentation to 6.0-6.5 and the fermentation temperature to 35°C.

[0054] Step (2): Open the cover 24 of the second feed port 21, pour the processed straw (dried in a 60°C oven, crushed and sieved, and the straw particles with a particle size of 0.85 mm) and the methanogenic inoculum into the methanogenic tank 22 through the second feed port 21; open the exhaust fan 26 at the first methane outlet 25 and the air control valve 28 at the second outlet 27 to extract the air in the methane tank 22. When the air pressure reaches 0.05 MPa, stop the air extraction and close the air control valve 28; connect the air collection bag to the second methane outlet 27, open the air control valve 28 and the AC motor 6, and anaerobically culture the fermentation mixture in the methane tank 22 for 25-30 days. Adjust the initial pH of the fermentation to 6.8-7.2 and the fermentation temperature to 35°C.

[0055] Step (3): Close the air control valve 28 and the AC motor 6, pull the first left horizontal push-pull rod 131 and the second left horizontal push-pull rod 133 to the left in turn, and pull the first right horizontal push-pull rod 132 and the second right horizontal push-pull rod 134 to the right, and most of the fermentation mixture in the hydrogen production tank 15 and the methane production tank 22 flows out of the tank body 19 under the action of gravity.

[0056] Step (4): Open the water pipe valve and clean the fermentation mixture remaining in the hydrogen production tank 15 and the methane production tank 22 by rotating the high-pressure cleaning nozzle 11. After cleaning, close the water pipe valve and carry out the next batch of HYTHANE preparation test after air drying.

[0057] It should be noted that the component connection relationships not specifically mentioned in the present invention are assumed to adopt the existing technology. Since they do not involve the invention point and are widely used in the existing technology, the structural connection relationships are not described in detail.

Claims

1. A device for preparing HYTHANE by anaerobic fermentation of kitchen waste and straw, characterized in that: It comprises a tank body (19), wherein a gas generating device (1), a stirring device (2) and a cleaning device are arranged in the tank body (19); The gas production device (1) comprises a hydrogen production device (4) and a methane production device (5), the methane production device (5) comprises a second feed inlet (21), a methane production tank (22) and a methane outlet (23), the hydrogen production device (4) comprises a first feed inlet (14), a hydrogen production tank (15), a hydrogen outlet (16) and a liquid transfer port (17), the liquid transfer port (17) is connected to the hydrogen production tank (15) and the methane production tank (22), and the hydrogen production tank (15) is arranged in the methane production tank (22); The stirring device (2) comprises an AC motor (6), a stirring column (7), a primary stirring paddle (8), a secondary stirring paddle (9) and a paddle (10), wherein the primary stirring paddle (8) extends into the hydrogen production tank (15), and the secondary stirring paddle (9) extends into the methane production tank (22); The cleaning device comprises a rotating high-pressure cleaning nozzle (11), an inclined rod (12) and a horizontal push-pull rod (13); the rotating high-pressure cleaning nozzle (11) is arranged in the hydrogen production tank (15) and the methane production tank (22); the inclined rod (12) is hinged at the lower end opening of the hydrogen production tank (15); and the horizontal push-pull rod (13) is connected to the inclined rod (12) and controls the opening and closing of the inclined rod (12).

2. The device for preparing HYTHANE by anaerobic fermentation of kitchen waste and straw according to claim 1, characterized in that: The stirring column (7) is a hollow steel pipe structure. The output shaft of the AC motor (6) is connected to the primary stirring paddle (8) and the secondary stirring paddle (9) through a long rod. The stirring speed of the stirring device (2) is controlled by the AC motor (6) installed on the top of the tank body (19). During stirring, the stirring column (7) remains stable and the paddle (10) rotates.

3. The device for preparing HYTHANE by anaerobic fermentation of kitchen waste and straw according to claim 2, characterized in that: The pipetting port (17) is arranged on the side wall of the stirring column (7) at the lower end of the hydrogen production tank (15); the primary stirring paddle (8) and the secondary stirring paddle (9) are connected via a stainless steel hollow steel pipe; the primary stirring paddle (8) uses a plurality of small blades (101) of exactly the same size to stir the fermentation mixture in the hydrogen production tank (15); and the secondary stirring paddle (9) uses a plurality of large blades (102) of exactly the same size to stir the fermentation mixture in the methane production tank (22).

4. The device for preparing HYTHANE by anaerobic fermentation of kitchen waste and straw according to claim 1, characterized in that: The end of the hydrogen outlet (16) is provided with a first hydrogen outlet (25), an exhaust fan (26) is installed on the first outlet (25), a second outlet (27) is provided on the first outlet (25) at the output end of the exhaust fan (26), and a gas control valve (28) is provided on the second outlet (27). The methane outlet (23) is configured in the same manner as the hydrogen outlet (16), and is also provided with the exhaust fan (26) and the gas control valve (28).

5. The device for preparing HYTHANE by anaerobic fermentation of kitchen waste and straw according to claim 1, characterized in that: Covers (24) are installed at the first feed port (14) and the second feed port (21).

6. The device for preparing HYTHANE by anaerobic fermentation of kitchen waste and straw according to claim 1, characterized in that: The horizontal push-pull rod (13) includes a first left horizontal push-pull rod (131) and a first right horizontal push-pull rod (132) arranged below the hydrogen production tank (15); the horizontal push-pull rod (13) is also arranged below the methane production tank (22), including a second left horizontal push-pull rod (133) and a second right horizontal push-pull rod (134) arranged below the methane production tank (22); the inclined rod (12) is symmetrically arranged at the lower end opening of the hydrogen production tank (15); the upper end of the inclined rod (12) is connected to the hydrogen production tank (15) through a hinge structure (29). The side wall of the hydrogen production tank (15) is connected, the middle ends of the inclined rods (12) on both sides are respectively connected to the first left horizontal push-pull rod (131) and the first right horizontal push-pull rod (132) through pull rings (30), the lower ends of the inclined rods (12) are connected to the stirring column (7) through a magnetic structure (31), and a sealing ring (32) made of polytetrafluoroethylene is installed below the magnetic structure (31); the second left horizontal push-pull rod (133) and the second right horizontal push-pull rod (134) are connected through a Dingmao structure (33).

7. The device for preparing HYTHANE by anaerobic fermentation of kitchen waste and straw according to claim 1, characterized in that: The rotating high-pressure cleaning nozzle (11) is installed on the top and side wall of the hydrogen production tank (15), and the rotating high-pressure cleaning nozzle (11) is also installed on the side wall of the methane production tank (22). Each of the rotating high-pressure cleaning nozzles (11) is connected to a branch water pipe and is collected to a main water pipe outside the tank body (19).

8. A method for preparing HYTHANE by anaerobic fermentation of kitchen waste and straw according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: opening a cover (24) on a first feed port (14), pouring processed food waste and hydrogen-producing inoculum into a hydrogen-producing tank (15) through the first feed port (14); opening an exhaust fan (26) of a first hydrogen outlet (25) and an air control valve (28) of a second hydrogen outlet (27), extracting air from the hydrogen-producing tank (15), and when the air pressure reaches 0.05 MPa, stopping the air extraction and closing the air control valve (28); connecting an air collection bag to a second hydrogen outlet (27), opening the air control valve (28) and an AC motor (6), and anaerobically culturing the fermentation mixture in the hydrogen-producing tank (15) for 6-8 days; Step 2: Open the lid (24) on the second feed port (21), pour the processed straw and the methanogenic inoculum into the methanogenic tank (22) through the second feed port (21); open the exhaust fan (26) at the first methane outlet (25) and the air control valve (28) at the second outlet (27) to extract the air in the methanogenic tank (22); when the air pressure reaches 0.05 MPa, stop the air extraction and close the air control valve (28); connect the air collection bag to the second methane outlet (27), open the air control valve (28) and the AC motor (6), and anaerobically culture the fermentation mixture in the methanogenic tank (22) for 25-30 days; Step 3: Close the gas control valve (28) and the AC motor (6), pull the first left horizontal push-pull rod (131) and the second left horizontal push-pull rod (133) to the left in sequence, and pull the first right horizontal push-pull rod (132) and the second right horizontal push-pull rod (134) to the right, so that most of the fermentation mixture in the hydrogen production tank (15) and the methane production tank (22) flows out of the tank body (19) under the action of gravity; Step 4: Open the water pipe valve and clean the fermentation mixture remaining in the hydrogen production tank (15) and the methane production tank (22) by rotating the high-pressure cleaning nozzle (11). After cleaning, close the water pipe valve and carry out the next batch of HYTHANE preparation test after air drying.

9. The method for preparing HYTHANE by anaerobic fermentation of kitchen waste and straw according to claim 8, characterized in that: In step 1, the food waste is dried in an oven at 60°C and then poured into a hydrogen production tank (15) together with the hydrogen production inoculum heated at 100°C for 30 minutes, and the initial fermentation pH is adjusted to 6.0-6.5 and the fermentation temperature is 35°C.

10. The method for preparing HYTHANE by anaerobic fermentation of kitchen waste and straw according to claim 8, characterized in that: In step 2, the straw is dried in an oven at 60°C, crushed and sieved, and straw particles with a particle size of 0.85 mm are poured into a methanogenic tank (22) together with a methanogenic inoculum. The initial pH of the fermentation is adjusted to 6.8-7.2 and the fermentation temperature is adjusted to 35°C.

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