A device and method for preparing hydrogen alkanes by layered anaerobic fermentation of kitchen waste and straw

Abstract

The application discloses a kind of kitchen waste and straw layered anaerobic fermentation preparation hydrogen alkane device and method, it is related to biomass fermentation technical field, including tank body, gas production device, stirring device and cleaning device are equipped in tank body.Gas production device includes hydrogen production device and methane production device, and methane production device includes second feed inlet, methane production tank and methane outlet.Hydrogen production device includes first feed inlet, hydrogen production tank, hydrogen outlet and pipette port, pipette port is communicated hydrogen production tank and methane production tank, and hydrogen production tank is located in methane production tank.In, treated kitchen waste and hydrogen inoculum are poured into hydrogen production tank by first feed inlet, and treated straw and methane production inoculum are poured into methane production tank by second feed inlet, paddle is stirred in two fermentation tanks, and acid in hydrogen production tank can be quickly flowed into methane production tank by pipette port.The whole device realizes the efficient coupling of kitchen waste anaerobic fermentation hydrogen production and straw anaerobic fermentation methane production, and has high fermentation efficiency and strong operability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of biomass fermentation. BACKGROUND

[0002] Anaerobic fermentation technology is an effective method for converting biomass waste such as kitchen waste and straw into hydrogen and alkane. Among them, kitchen waste is considered an ideal substrate for anaerobic fermentation to produce hydrogen because of its high hydrogen content and rich sugar content that can be easily hydrolyzed by microorganisms. However, the accumulation of volatile fatty acids such as acetic acid due to the fast hydrolysis rate is inevitable, which leads to a low hydrogen production rate.

[0003] Compared with kitchen waste, the same quality of straw has a higher carbon content, so it is more suitable as an anaerobic fermentation substrate for producing methane. However, due to the nutritional specificity of methanogens, their growth and metabolic rates are much lower than those of other microorganisms, which leads to a low methane production rate. If the volatile fatty acids such as acetic acid accumulated during the anaerobic fermentation of kitchen waste to produce hydrogen are transferred to the anaerobic fermentation system of straw to produce methane in a timely manner, the acid inhibition effect caused by excessive accumulation of volatile fatty acids can be alleviated, and the methanogens can be provided with directly usable nutrients, thereby helping to improve the hydrogen production rate of kitchen waste and the methane production rate of straw. Existing hydrogen and alkane preparation devices mostly use substrate full-mixing fermentation devices: kitchen waste and straw are completely mixed together, and hydrogen and alkane are 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, high impurity gas, and high safety hazards. SUMMARY

[0004] The purpose of the present application is to solve the technical problems of long start-up time, unstable system operation, low gas production, high impurity gas, and high safety hazards of the hydrogen and alkane preparation device. The first purpose of the present application is to provide a kitchen waste and straw layered anaerobic fermentation device for preparing hydrogen and alkane, which can ferment kitchen waste and straw separately, mix the fermentation products, and has stable operation, stable gas production, less impurity gas, and safety and reliability.

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

[0006] A kitchen waste and straw layered anaerobic fermentation device for preparing hydrogen and alkane, comprising a tank body, wherein a gas production 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 pipette port, the pipette port communicates 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 alternating current motor, a stirring column, a primary stirring paddle, a secondary stirring paddle and a paddle, 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 comprises 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, and the horizontal push-pull rod is connected with the inclined rod and controls the opening and folding of the inclined rod.

[0010] Through the above scheme, the tank body is arranged, the methane production tank and the hydrogen production tank arranged in the methane production tank are arranged, and the liquid transfer port is arranged to communicate the hydrogen production tank and the methane production tank. The hydrogen production tank and the methane production tank are arranged respectively, the treated kitchen waste and the hydrogen production inoculum are poured into the hydrogen production tank through the first feeding port, the treated straw and the methane production inoculum are poured into the methane production tank through the second feeding port, and the alternating current motor is started to stir the two fermentation tanks through the primary stirring paddle, the secondary stirring paddle and the paddle. When the acid in the hydrogen production tank flows into the methane production tank through the liquid transfer port, a conduit is not needed, and the gases produced by the two tank bodies are collected through the hydrogen outlet and the methane outlet. During the later stage of the reaction, 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 through the arrangement of the inclined rod and the horizontal push-pull rod. The fermentation mixture in the hydrogen production tank and the methane production tank can be quickly cleaned. The rotating high-pressure cleaning nozzle is arranged to clean each tank body, which is convenient to operate and saves time. The whole device realizes efficient coupling of anaerobic fermentation of kitchen waste to produce hydrogen and anaerobic fermentation of straw to produce methane. The fermentation efficiency is high, the design is reasonable, and the operability is strong. The present application can not only ensure the stable operation of the device to the greatest extent, but also effectively improve the hydrogen and methane production rate.

[0011] Further, the stirring column is a hollow steel pipe structure, the output shaft of the alternating current motor is connected with the primary stirring paddle and the secondary stirring paddle through a long rod, and the stirring speed of the stirring device is realized by controlling the rotating speed of the alternating current motor installed at the top of the tank body. During stirring, the stirring column maintains stability, and the paddle rotates.

[0012] Through the above scheme, the stirring column is a hollow steel pipe structure, which facilitates the arrangement of the liquid transfer port for liquid-gas communication, and the arrangement of the alternating current motor facilitates the rotation of the paddle to maintain the fermentation state.

[0013] Further, the liquid transfer port is arranged on the side wall of the stirring column at the lower end of the hydrogen production tank, the primary stirring paddle and the secondary stirring paddle are connected through a stainless steel hollow steel pipe, the primary stirring paddle is implemented by a plurality of small paddles with the same size to stir the fermentation mixture in the hydrogen production tank, and the secondary stirring paddle is implemented by a plurality of large paddles with the same size to stir the fermentation mixture in the methane production tank.

[0014] Through the above scheme, the small paddle and the large paddle of two specifications are arranged, so that stirring can be carried out according to the different contents of the hydrogen production tank and the methane production tank, the structure is reasonable, and the operation is stable.

[0015] Further, the hydrogen gas outlet end is provided with a hydrogen gas first outlet, an exhaust fan is installed on the first outlet, a second outlet is provided on the outlet end of the exhaust fan, a gas control valve is provided on the second outlet, and the methane outlet is also provided with the hydrogen gas outlet, and the exhaust fan and the gas control valve are also provided.

[0016] Through the above scheme, the exhaust fan and the gas control valve are arranged at the hydrogen gas outlet end and the methane outlet, so that the tank body can be sealed and vacuumized, the anaerobic fermentation environment can be formed, the subsequent fermentation gas collection is facilitated, and the "one mouth for two purposes" effect is achieved. That is, the air in the hydrogen production tank and the methane production tank can be extracted to create an anaerobic environment, and the generated hydrogen and methane can be quickly and synchronously collected.

[0017] Further, lids are installed at the first inlet and the second inlet.

[0018] Through the above scheme, the lids are arranged to facilitate the sealing of the first inlet and the second inlet, and facilitate fermentation and vacuumization.

[0019] Further, the horizontal push-pull rods include a first left horizontal push-pull rod and a first right horizontal push-pull rod arranged below the hydrogen production tank, and a second left horizontal push-pull rod and a second right horizontal push-pull rod arranged below the methane production tank. The inclined rods are symmetrically arranged at the lower end opening of the hydrogen production tank, the upper end of the inclined rod is connected to the side wall of the hydrogen production tank through a hinge structure, the middle end of the inclined rod on both sides is connected to the first left horizontal push-pull rod and the first right horizontal push-pull rod through a pull ring, respectively, the lower end of the inclined rod is connected to the stirring column through a magnetic attraction structure, and a sealing ring made of polytetrafluoroethylene is installed below 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, the first left horizontal push-pull rod and the first right horizontal push-pull rod are pulled, the second left horizontal push-pull rod and the second right horizontal push-pull rod are pulled, the inclined rod is opened at the lower end, the methane production tank is opened below, 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 through the cleaning device, then the lower end of the inclined rod is connected to the stirring column through the magnetic attraction structure and sealed through the sealing ring, and the second left horizontal push-pull rod and the second right horizontal push-pull rod are pushed back to complete the reset, facilitating the next hydrogen and methane preparation test.

[0021] Further, the rotating high-pressure cleaning spray head is installed on the top and side wall of the hydrogen production tank, and the rotating high-pressure cleaning spray head is also installed on the side wall of the methane production tank, each of the rotating high-pressure cleaning spray heads is connected with a branch water pipe and is gathered on a total water pipe outside the tank body.

[0022] Through the above scheme, the water pipe valve is opened, the residual fermentation mixture in the hydrogen production tank and the methane production tank is cleaned through the rotating high-pressure cleaning spray head, the water pipe valve is closed after cleaning, and the next batch of hydrogen and alkane preparation test can be carried out after air drying.

[0023] The application provides a method for preparing hydrogen and alkane by layered anaerobic fermentation of kitchen waste and straw, and the specific steps include:

[0024] Step 1: open the cover on the first feeding port, pour the treated kitchen waste and hydrogen production inoculum into the hydrogen production tank through the first feeding port, open the exhaust fan of the hydrogen first outlet and the gas control valve of the second outlet, and exhaust the air in the hydrogen production tank, stop the air exhaust when the air pressure reaches 0.05 MPa, and close the gas control valve, connect the gas collecting bag with the hydrogen second outlet, open the gas control valve and the alternating current motor, and anaerobically culture the fermentation mixture in the hydrogen production tank for 6-8 days.

[0025] Step 2: open the cover on the second feeding port, pour the treated straw and methane production inoculum into the methane production tank through the second feeding port, open the exhaust fan of the methane first outlet and the gas control valve of the second outlet, and exhaust the air in the methane production tank, stop the air exhaust when the air pressure reaches 0.05 MPa, and close the gas control valve, connect the gas collecting bag with the methane second outlet, open the gas control valve and the alternating current motor, and anaerobically culture the fermentation mixture in the methane production tank for 25-30 days.

[0026] Step 3: close the gas control valve and the alternating current 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, 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, clean the residual fermentation mixture in the hydrogen production tank and the methane production tank through the rotating high-pressure cleaning spray head, close the water pipe valve after cleaning, and the next batch of hydrogen and alkane preparation test can be carried out after air drying.

[0028] Further, in step 1, the kitchen waste is dried in a 60 DEG C oven, and then is poured into the hydrogen production tank together with the hydrogen production inoculum heated at 100 DEG C for 30 min, the initial pH of the fermentation is adjusted to 6.0-6.5, and the fermentation temperature is 35 DEG C.

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

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

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

[0032] 2. The acid in the hydrogen production tank can flow into the methane production tank through the pipette port quickly without using a conduit, and the degree of automation is high, and the investment and construction cost are low.

[0033] 3. The hydrogen and methane outlet has a "one mouth for two uses" function, which can be regarded as an air extraction port to extract air from the hydrogen production tank and the methane production tank to create an anaerobic environment, and can also be regarded as a gas outlet to quickly and synchronously collect the generated hydrogen and methane.

[0034] 4. By setting the inclined rod and the 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 to operate, saves time and improves the practicality and convenience of the device. DETAILED DESCRIPTION

[0035] Figure 1 is a structural schematic view of the present application;

[0036] Figure 2 is a partial enlarged view of the pipette port of the present application;

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

[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, primary stirring paddle; 9, secondary stirring paddle; 10, paddle; 101, small paddle; 102, large paddle; 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, pipette port; 18, stainless steel rod; 19, tank body; 20, metal filter screen; 21, second feed inlet; 22, methane production tank; 23, methane outlet; 24, cover; 25, first outlet; 26, exhaust fan; 27, second outlet; 28, gas control valve; 29, hinge structure; 30, pull ring; 31, magnetic attraction structure; 32, sealing ring; 33, Ding Mao structure. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0041] Embodiment 1

[0042] The present application provides a kitchen waste and straw layered anaerobic fermentation hydrogen alkane device, as shown in Figures 1-3 The device 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 paddle 10. The cleaning device includes a rotating high-pressure cleaning nozzle 11, an inclined rod 12 and a horizontal push-pull rod 13.

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

[0044] The tank body 19 is arranged, the methane production tank 22 and the hydrogen production tank 15 arranged in the methane production tank 22 are arranged, and the pipetting port 17 is arranged to communicate the hydrogen production tank 15 and the methane production tank 22, the hydrogen production tank 15 and the methane production tank 22 are arranged respectively, the treated kitchen waste and the hydrogen production inoculum are poured into the hydrogen production tank 15 through the first feeding port 14, the treated straw and the methane production inoculum are poured into the methane production tank 22 through the second feeding port 21, and the two fermentation tanks are stirred through the first-stage stirring paddle 8, the second-stage stirring paddle 9 and the paddle 10 by starting the alternating current motor 6 at the same time, the acid in the hydrogen production tank 15 can flow into the methane production tank 22 quickly through the pipetting port without using a pipe, and the gases generated by the two tank bodies 19 are collected through the hydrogen outlet 16 and the methane outlet 23, 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 through the arrangement of the inclined rod 12 and the horizontal push-pull rod 13 device in the later stage of the reaction, the fermentation mixture in the hydrogen production tank 15 and the methane production tank 22 can be quickly cleaned, and each tank body 19 is cleaned by the rotary high-pressure cleaning nozzle 11, which is convenient to operate and saves time, the whole device realizes efficient coupling of anaerobic fermentation of kitchen waste to produce hydrogen and anaerobic fermentation of straw to produce methane, has high fermentation efficiency, reasonable design and strong operability. The application can not only ensure stable operation of the device to the greatest extent, but also effectively improve the hydrogen and methane production rate.

[0045] Referring to Figure 1 and Figure 2 , the first feeding port 14 and the second feeding port 21 are provided with lids 24; the hydrogen outlet 16 is provided with a hydrogen first outlet 25, the first outlet 25 is provided with an exhaust fan 26, the first outlet 25 is provided with a second outlet 27 at the output end of the exhaust fan 26, the second outlet 27 is provided with a gas control valve 28, the methane outlet 23 adopts the hydrogen outlet 16 and is also provided with the exhaust fan 26 and the gas control valve 28, the hydrogen and methane first outlet 25 is provided with the exhaust fan 26, the second outlet 27 is provided with the gas control valve 28, and the methane outlet 23 adopts the hydrogen outlet 16 and is also provided with the exhaust fan 26 and the gas control valve 28.

[0046] Therefore, the cover is arranged to facilitate sealing of the first inlet 14 and the second inlet 21, facilitating fermentation and vacuumizing, and facilitating formation of an anaerobic fermentation environment, and facilitating subsequent fermentation gas collection. The cover has a "one mouth for two purposes" function, which can be regarded as a gas outlet to extract air in the hydrogen production tank 15 and the methane production tank 22 to create an anaerobic environment, and can be regarded as a gas inlet to quickly and synchronously collect the generated hydrogen and methane.

[0047] To facilitate stirring and gas-liquid exchange, the stirring device 2 is arranged to have a stirring column 7, which is connected to a first stirring paddle 8 and a second stirring paddle 9. Figure 1 The stirring speed of the stirring device 2 is achieved by controlling the rotating speed of an alternating current motor 6 installed at the top of the tank 19. When stirring, only the paddles 10 rotate, and the stirring column 7 is stationary.

[0048] Preferably, the first stirring paddle 8 and the second stirring paddle 9 are connected by a stainless steel hollow steel pipe. The first stirring paddle 8 is implemented by eight small paddles 101 of the same size to stir the fermentation mixture in the hydrogen production tank 15, and the second stirring paddle 9 is implemented by eight large paddles 102 of the same size to stir the fermentation mixture in the methane production tank 22. The hollow steel pipe structure of the stirring column facilitates the arrangement of a liquid transfer port for liquid-gas exchange, the arrangement of the alternating current motor for driving the paddles to rotate, and the arrangement of small and large paddles of two specifications for stirring according to the different contents of the hydrogen production tank 15 and the methane production tank 22. The structure is reasonable and stable in operation.

[0049] Preferably, the rotating high-pressure cleaning spray head 11 is installed at the top and side wall of the hydrogen production tank 15 and the side wall of the methane production tank 22. Each spray head 11 is connected to a branch water pipe, and all branch water pipes are connected to a total water pipe outside the tank 19. By opening the water pipe valve, the rotating high-pressure cleaning spray head is used to clean the residual fermentation mixture in the hydrogen production tank 15 and the methane production tank 22. After cleaning, the water pipe valve is closed, and after air drying, the next batch of hydrogen and methane production test can be performed.

[0050] Preferably, the rotating high-pressure cleaning spray head 11 is installed at the top and side wall of the hydrogen production tank 15 and the side wall of the methane production tank 22. Each spray head 11 is connected to a branch water pipe, and all branch water pipes are connected to a total water pipe outside the tank 19. By opening the water pipe valve, the rotating high-pressure cleaning spray head is used to clean the residual fermentation mixture in the hydrogen production tank 15 and the methane production tank 22. After cleaning, the water pipe valve is closed, and after air drying, the next batch of hydrogen and methane production test can be performed. Figure 1 and Figure 2The upper end of the inclined rod 12 is connected with the left and right side walls of the hydrogen production tank 15 through the hinge structure 29, the middle end is connected with the first left and right horizontal push-pull rods 131 and 132 through the pull ring 30, and the lower end is connected with the stirring column 7 through the magnetic attraction structure 31, which is a common electromagnetic attraction structure. Only the position is shown in the figure, and the sealing ring 32 made of polytetrafluoroethylene is installed below the magnetic attraction structure 31.

[0051] Therefore, when the fermentation is completed, the first left and right horizontal push-pull rods and the second left and right horizontal push-pull rods are pulled, the inclined rod is opened at the lower end, the methane production tank 22 is opened below, 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 under the action of gravity, then the inside of the tank body 19 is cleaned through the cleaning device, then the lower end of the inclined rod is connected with the stirring column through the magnetic attraction structure and is sealed through the sealing ring, the second left and right horizontal push-pull rods are pushed back in the reverse direction to complete the reset, and the next hydrogen and methane preparation test is facilitated.

[0052] Based on the same inventive concept, the application also provides a use method of the kitchen waste and straw layered anaerobic fermentation hydrogen and methane preparation device, which comprises the following steps:

[0053] Step (1): open the cover 24 of the first feeding port 14, pour the treated kitchen waste (dried in a 60°C oven) and hydrogen production inoculum (heated at 100°C for 30 min) into the hydrogen production tank 15 through the first feeding port 14, open the exhaust fan 26 of the hydrogen first outlet 25 and the gas control valve 28 of the second outlet 27, and exhaust the air in the hydrogen production tank 15, stop the air exhaust when the air pressure reaches 0.05 MPa, and close the gas control valve 28; connect the gas collecting bag with the hydrogen second outlet 27, open the gas control valve 28 and the alternating current motor 6, and anaerobically culture the fermentation mixture in the hydrogen production tank 15 for 6-8 days. The initial pH of the fermentation is adjusted to 6.0-6.5, and the fermentation temperature is 35°C.

[0054] Step (2): open the second feed port 21 cover 24, the treated straw (60℃ oven drying after crushing sieve, take the particle size of 0.85mm straw particles) and methanogenic inoculum through the second feed port 21 poured into the methanogenic tank 22; open the methane first outlet 25 at the exhaust fan 26 and the second outlet 27 at the gas control valve 28, the air in the methanogenic tank 22 is extracted, when the air pressure reaches 0.05MPa, stop pumping, close the gas control valve 28; connecting gas bag and methane second outlet 27, open the gas control valve 28 and AC motor 6, the anaerobic culture 25-30 days of fermentation mixture in the methanogenic tank 22. Adjust the initial pH of fermentation to 6.8-7.2, fermentation temperature is 35℃.

[0055] Step (3): close the gas control valve 28 and 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, pull the first right horizontal push-pull rod 132 and the second right horizontal push-pull rod 134 to the right, most of the fermentation mixture in the hydrogen production tank 15 and the methanogenic tank 22 flows out of the tank body 19 under the action of gravity.

[0056] Step (4): open the water pipe valve, through the rotation of high pressure cleaning nozzle 11 to the hydrogen production tank 15 and the methanogenic tank 22 residual fermentation mixture cleaning, after cleaning, close the water pipe valve, dry after the next batch of hydrogen alkane preparation test.

[0057] It should be noted that the connection relationship of the components not mentioned in the application is defaulted to use the prior art, since it does not involve the invention point, and is generally applied in the prior art, so the structure connection relationship is 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 provided 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 port (21), a methane production tank (22) and a methane outlet (23), the hydrogen production device (4) comprises a first feed port (14), a hydrogen production tank (15), a hydrogen outlet (16) and a pipetting port (17), the pipetting 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 first-stage stirring paddle (8), a second-stage stirring paddle (9) and a blade (10), wherein the first-stage stirring paddle (8) extends into the hydrogen production tank (15), and the second-stage 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 to the lower end opening of the hydrogen production tank (15); the horizontal push-pull rod (13) is connected to the inclined rod (12) and controls the opening and closing of the inclined rod (12); The stirring column (7) is a hollow steel tube structure. The output shaft of the AC motor (6) is connected to the first-stage stirring paddle (8) and the second-stage 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 (19). During stirring, the stirring column (7) remains stable and the paddle (10) rotates. The pipetting port (17) is provided on the side wall of the stirring column (7) at the lower end of the hydrogen production tank (15); the first-stage stirring paddle (8) and the second-stage stirring paddle (9) are connected via a stainless steel hollow pipe; the first-stage 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 second-stage 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).

2. The device for preparing HYTHANE by anaerobic fermentation of kitchen waste and straw according to claim 1, characterized in that: 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 manner as the hydrogen outlet (16), and is also provided with the exhaust fan (26) and the air control valve (28).

3. The device for preparing HYTHANE by layered 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).

4. 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) and includes 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 upper end of the hydrogen production tank (15) through a hinge structure (29). The side wall of the hydrogen production tank (15) is connected, and 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), and 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).

5. 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 the main water pipe outside the tank body (19).

6. A method for preparing HYTHANE by anaerobic fermentation of kitchen waste and straw, using the device for preparing HYTHANE by anaerobic fermentation of kitchen waste and straw according to any one of claims 1 to 5, characterized in that: The method for preparing HYTHANE comprises the following steps: Step 1: Open the cover (24) on the first feed port (14), pour the processed food waste and hydrogen-producing inoculum into the hydrogen-producing 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-producing tank (15); 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 hydrogen outlet (27), open the air control valve (28) and the AC motor (6), and anaerobically culture the fermentation mixture in the hydrogen-producing tank (15) for 6-8 days; Step 2: Open the cover (24) on the second feed port (21), pour the processed straw and the methane-producing inoculum into the methane-producing 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-producing 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-producing 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, 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; 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 air dry before conducting the next batch of hydrogen alkane preparation test.

7. The method for preparing HYTHANE by layered anaerobic fermentation of kitchen waste and straw according to claim 6, characterized in that: In step 1, the food waste is dried in an oven at 60°C and then poured into the hydrogen production tank (15) together with the hydrogen production inoculum heated at 100°C for 30 minutes. The initial pH of the fermentation is adjusted to 6.0-6.5 and the fermentation temperature is adjusted to 35°C.

8. The method for preparing HYTHANE by layered anaerobic fermentation of kitchen waste and straw according to claim 6, characterized in that: In step 2, the straw is dried in an oven at 60°C and then crushed and sieved. Straw particles with a particle size of 0.85 mm are taken and poured into the methanogenic tank (22) together with the methanogenic inoculum. The initial fermentation pH is adjusted to 6.8-7.2 and the fermentation temperature is adjusted to 35°C.

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