CN103332839A - Rotary washing type automatic anti-crusting methane tank - Google Patents

Abstract

The invention relates to a rotary flushing type automatic anti-encrustation biogas digester. The purpose is to provide a biogas digester with the function of automatically preventing crusting of raw materials, and can be used continuously without increasing maintenance workload, and is safe and convenient to use. The technical solution is: a rotary flushing automatic anti-crust biogas digester, including a cylindrical fermentation tank. The top of the fermentation tank is provided with an outlet and sealed with a top cover. ; The opposite sides of the fermentation tank are made with a feed inlet and a discharge outlet, and the feed inlet and the discharge outlet are respectively connected to the feed tank and the discharge tank through pipelines; it is characterized in that a rotary flushing automatic Anti-crust device, which includes a collection tank installed under the feed inlet to receive liquid raw materials, an annular pipe that communicates with the drainage hole of the collection tank and surrounds the inner wall of the fermentation tank, and a float valve installed at the drainage hole of the collection tank ; The annular pipeline is also made with a plurality of spray ports facing the inner wall of the fermentation tank.

Description

Rotary flushing automatic anti-crust biogas digester

technical field

The invention relates to a biogas digester, in particular to a biogas digester which can automatically prevent crusting of raw materials in the pond.

Background technique

In recent years, with the increasingly serious energy contradiction, building a conservation-oriented society has become the fundamental way to solve the problem. As a high-quality, clean and renewable bioenergy, biogas has been widely used across the country. However, there are certain defects in the existing biogas digesters, among which the encrustation of raw materials is the main problem to be solved. Due to the uncoordinated feeding ratio of feces and water in the process of using the biogas digester, and at the same time, the material is not discharged and stirred in time, resulting in less water in the fermentation room, and a large amount of organic acid produced during the fermentation process accumulates, causing the fermentation raw materials to float. The shell will hinder the accumulation of biogas generated in the pool, reduce the effective volume and gas storage chamber, reduce the utilization rate of raw materials, and reduce the gas production. When the incrustation is serious, the biogas digester cannot be used normally and will be discarded, resulting in waste of resources and energy; therefore, solving the incrustation problem is an important condition for the promotion of biogas projects in the construction of new rural areas. At the same time, my country's rural population structure is gradually aging. The realization of automatic treatment is an important guarantee for the normal operation of biogas digesters, so as to reduce the maintenance and repair work in the later stage and improve the fermentation efficiency and gas production quality.

Contents of the invention

The purpose of the present invention is to overcome the disadvantages of the above-mentioned background technology, and provide an improvement of a biogas digester, which has the function of automatically preventing crusting of raw materials, can be used continuously, does not need to increase the maintenance workload, and is safe and convenient to use.

The technical solution provided by the present invention is: a rotary scouring automatic anti-crust biogas digester, including a cylindrical fermentation tank buried under the ground, an outlet is provided on the top of the fermentation tank and sealed with a top cover, and a tank opening is installed on the top of the tank. There is a biogas pipe for leading out biogas inside; the opposite sides of the fermentation tank are made with a feed port and a discharge port, and the feed port and the discharge port are respectively connected to the feed tank and the discharge tank through pipelines; it is characterized in that There is also a rotary flushing automatic anti-crust device in the fermentation tank, which includes a collection tank installed under the feed inlet to receive liquid raw materials, an annular pipe that communicates with the drainage hole of the collection tank and surrounds the inner wall of the fermentation tank, and is installed on the collection tank. The floating ball valve at the drain hole of the tank; the annular pipeline is also made with a plurality of spray ports facing the inner wall of the fermentation tank.

The top of the collection pool is open, and the opening is covered by a screen to screen out larger particles in the liquid raw material.

The annular pipe is a certain distance higher than the liquid surface of the collection pool and forms a certain inclination angle with the liquid surface of the collection pool.

The float valve includes a float and a flush valve connected to the float through a pull rod.

The working principle of the present invention is as follows: the liquid raw material (mainly animal manure) of the biogas digester is input from the feed pool on the ground through the feed port, and enters the collection pool after being filtered by the screen. Under the influence of the action and the impact of part of the liquid, it falls from the edge of the screen and falls into the pool; when the liquid level in the collection pool rises to a certain water level, the floating ball rises under the action of buoyancy and pulls the flushing valve through the pull rod, and the liquid raw materials in the pool That is, it enters the annular pipe through the drainage hole, then sprays out through the spray port on the pipe, and swirls down the pool wall counterclockwise (the direction in the southern hemisphere is opposite), accelerates continuously during the downward flow, and finally falls into the pool at a certain speed. pool. When the liquid level in the collection tank drops to a certain level, the floating ball will fall and close the flush valve due to the negative pressure, and the collection tank will accumulate liquid raw materials again. In this way, the liquid raw material enters, the collection tank stores water, the circular pipeline accelerates, and the liquid raw material is sprayed out from the spray port and rushed into the water body. This process continues continuously; due to the continuous impact and disturbance of the liquid raw material, the crust of the biogas raw material is destroyed. Conditions to create good environmental conditions for normal biogas production.

The beneficial effects of the present invention are: due to the addition of the anti-encrustation device, the encrustation of the biogas digester can be effectively prevented, thereby significantly improving the fermentation efficiency (it can be increased by 20-35% according to calculations), realizing high biogas production, and significantly reducing the later stage Maintenance workload, avoiding the inconvenience caused by frequent refueling, manual or mechanical stirring. In addition, the invention has low investment and simple construction, and can be additionally installed in ordinary methane pools, thereby reducing additional investment; it has good popularization value.

Description of drawings

Fig. 1 is a front view structural schematic diagram of the present invention.

Fig. 2 is a top view structural schematic diagram of the present invention.

Detailed ways

Rotary scour type automatic anti-crust device biogas digester, including a cylindrical fermentation tank 1 buried under the ground (the figure shows that the fermentation tank is buried below the ground line E), and the top of the fermentation tank is equipped with outlets 1-3 and topped The cover is sealed; on the top of the tank, there is a biogas pipe Q leading into the tank cavity, which is used to lead out the biogas; on the opposite sides of the fermentation tank, there are feed ports 1-1 and discharge ports 1-2, feed ports and discharge ports. The feed port is connected to the feed pool 3 and the discharge pool 4 through the feed pipe 2 and the discharge pipe 5 respectively. The above is the conventional structure of the biogas digester.

In the present invention, an anti-crust device is also arranged in the fermentation tank; the whole device is located above the liquid level of the fermentation liquid in the tank, wherein: the collection tank 7 is installed below the feed port, and the top of the collection tank is open to receive the liquid raw material input from the feed port A drainage hole 7-3 is arranged at the bottom of the collection tank, and the annular pipe 8 communicates with the drainage hole and surrounds the inner wall of the fermentation tank (shown in the figure: the annular pipeline is higher than the liquid surface of the collection tank by a certain distance and forms a certain inclination angle with the liquid surface of the collection tank , in order to increase the impact force of the water sprayed from the spray port; the inclination can be selected according to the needs); a float valve is also installed at the drain hole of the collection pool (the float valve includes a float 7-1, which is passed through the pull rod A flush valve 7-2 connected to the float); the annular pipe is also made with a plurality of spray ports 9 facing the inner wall of the fermentation tank; the spray ports can be directly formed on the annular pipe, or can be Install an elbow on the circular pipe (as shown).

Further, the opening at the top of the collection tank is covered by a screen 6; when the liquid raw material input from the feed port 1-1 passes through the screen, larger particles are trapped and then slide down from the edge of the screen and fall into the fermentation tank. The rest of the liquid passes through the screen and enters the collection tank to accumulate, which is used as the power source for water washing.

The collection tank shown in the picture is fixed on the inner wall of the fermentation tank, and is formed by part of the inner wall of the fermentation tank and other building materials (recommended cement board); it can also be made into an independent container and fixed in the fermentation tank. The collection tank should be higher than the fermentation liquid level in the tank and keep as far as possible to effectively utilize the potential energy of the liquid in the collection tank.

The raw material of the biogas digester enters the fermentation tank from the feeding tank on the ground through the feeding port, and is first filtered by the screen, and the large particles fall into the fermentation tank under the action of gravity and the impact of part of the water flow, and the remaining liquid enters the collection tank through the screen hole (The volume of the collection tank is determined according to the need); when the liquid level in the pool rises to a certain height, the float rises under the action of buoyancy (the size and material of the float are determined according to the need), and the valve is pulled by the pull rod, and the liquid in the pool is released. Enter the ring pipe through the drain hole. When the water level in the collection tank drops to a certain level, the valve will be closed due to the negative pressure, and the liquid raw material will be accumulated again. And the liquid flowing in the pipeline is sprayed out through the uniformly arranged spray ports 9 on the pipeline respectively and flows down along the pool wall, continuously accelerates during the downward flow, and finally falls into the pool at a certain speed.

The anti-crust device is generally made of cement material.

Claims (4)

1. Rotating scour type automatic anti-crust biogas digester, including a cylindrical fermentation tank (1) buried under the ground. The top of the fermentation tank is provided with an outlet and sealed with a top cover. The biogas pipe (Q) used to lead out the biogas; the opposite sides of the fermentation tank are made with a feed port (1-1) and a feed port (1-2), and the feed port and the discharge port are respectively connected to the feed tank through pipes (3) and a discharge tank (4); it is characterized in that the fermentation tank is also equipped with a rotary scouring automatic anti-encrustation device, which includes a collection tank (7) installed under the feed port to receive liquid raw materials, The annular pipe (8) that is connected to the drainage hole (7-3) of the collection tank and surrounds the inner wall of the fermentation tank and the float valve installed at the drainage hole of the collection tank; there are also multiple valves facing the fermentation tank on the ring pipe. Spray outlet (9) on the wall. 2. The rotating scouring type automatic anti-crust biogas digester according to claim 1, characterized in that: the top of the collection pool is open, and the opening is covered by a screen (6) to screen out liquid raw materials of larger particles. 3. The rotary scour type automatic anti-crust biogas digester according to claim 2, characterized in that: the annular pipe is a certain distance higher than the liquid surface of the collection pond and forms a certain inclination angle with the liquid surface of the collection pond. 4. The rotary scouring type automatic anti-crust biogas digester according to claim 3, characterized in that: the float valve includes a float (7-1) and a flush valve (7-1) connected to the float through a pull rod -2).