CN103243020A - Water pressure type clean water methane tank hulling method and device - Google Patents

Abstract

The invention discloses a water pressure type biogas tank clear water shell breaking method and the device used. An atomizing nozzle is installed above the biogas tank, and the pipe connecting the atomizing nozzle forms a U-shaped pipe outside the pool and then connects a water valve. The U-shaped The height of the water inlet end of the pipe is higher than the highest water storage height in the water pressure room, and the bent part of the bottom of the U-shaped pipe is lower than the bottom of the nozzle. After incrustation, spray clean water evenly on the top of the crust layer in the biogas digester at regular intervals to wet part of the crust layer and ferment the raw materials again. The raw materials are wetted and degraded to reduce the lateral tension of the raw materials and let the crust layer below The generated biogas and biogas slurry overflow through these parts, thereby breaking the crust layer and completing the crust breaking. The invention has the advantages of simple device, low cost and easy operation, can increase the utilization rate of raw materials in the pond, realize the diversification of fermentation raw materials, increase the gas production of the biogas pit, and reduce the problem of crusting.

Description

Water pressure biogas digester clear water shell breaking method and the device used

technical field

The invention relates to a method for breaking shells of a water pressure biogas digester with clear water and a device used.

Background technique

The current biogas fermentation process includes hydraulic process, fully mixed anaerobic process (CSTR), upflow anaerobic sludge bed reactor (UASB), IC reactor process, etc. In my country, the hydraulic biogas process is mainly used in household biogas and small and medium-sized biogas projects. The hydraulic biogas digester has obvious advantages, simple and convenient construction and use, and low cost. At present, more than 95% of the biogas digesters promoted in rural areas in my country are It is a hydraulic biogas digester, but the hydraulic biogas digester also has its shortcomings, one of which is that it does not have the functions of anti-crust and broken shells. During the fermentation process of the biogas digester, the fermentation raw materials float on the water surface, especially the easily floating substances such as cow dung and straw. The floating materials become dry because they are higher than the water level, so that they cannot be degraded and fermented, and a hard shell layer is formed. As the fermented raw materials continue to float up, the upper raw materials are lifted up, and the crust layer becomes thicker and thicker, and some can even stand on it. Once the biogas digester is encrusted, there will be less and less space for fermentation in the biogas digester, as well as less and less gas storage space at the top, and the effect of gas production will gradually decline, and over time it will become a sick pond and a waste pond. Due to the widespread phenomenon of crusting of biogas in rural areas, the crusting has seriously hindered the development of rural biogas industry, so the problem of shell breaking must be solved. The newly added shell breaking methods of the existing hydraulic biogas digesters mainly include manually stirring the fermentation liquid shell breaking at the outlet, biogas slurry backflow breaking shells, and full tank fermentation shell breaking. These methods have their advantages, but more are limitations Sex, cannot complete shell breaking. For example, the method of manually stirring the fermentation liquid at the discharge port to break the shell, because the fermentation raw materials can only be stirred from the bottom, and the upper layer of the fermentation raw materials is not stirred much, so it can only be effective in preventing crusting and just crusting. Can't break the shell. The idea of biogas slurry backflow to break the shell is very good, but because the biogas slurry is easy to settle and block the return pipe and liquid outlet hole, and because the biogas slurry needs to be pumped out of the tank by manual or mechanical means and then sprayed back to the surface of the raw material in the fermentation room, there are often problems The biogas slurry overflows outside the pond, causing the outside of the pond to be smelly and dirty. At the same time, the biogas slurry extraction facilities are also prone to rust and rot, so they are not welcomed by farmers and are difficult to promote. Fermentation in a full tank has a certain effect, but fermentation in a full tank requires an additional gas storage chamber, which is complicated to build and more expensive, and it is also difficult to prevent the air outlet at the top from being sealed or blocked.

Contents of the invention

The technical problem to be solved by the present invention is to provide a water pressure type biogas digester clear water shell breaking method and the device used to effectively prevent the biogas digester from encrusting and effectively deal with the biogas digester's encrustation problem.

The present invention solves the above technical problems with the following technical solutions:

The water pressure type biogas tank clear water shell breaking method of the present invention, at least one atomizing nozzle placed above the crust layer is arranged on the top of the biogas tank, the pipeline connecting the atomizing nozzle forms a U-shaped pipe outside the pool, and the U-shaped pipe connects the water Valve, by regularly spraying clean water evenly on the top of the crust layer in the biogas digester, so that part of the crust layer is wetted, and the raw materials are fermented again. The raw materials are wetted and degraded to reduce the lateral tension of the raw materials, and let the crust layer generated below Biogas and biogas slurry overflow through these parts, thereby breaking the crust layer and completing the crust breaking.

The device adopted by the water pressure biogas tank of the present invention is to install an atomizing nozzle above the biogas tank, and the pipe connecting the atomizing nozzle forms a U-shaped pipe outside the pool, and the other end of the U-shaped tube is connected to the clear water outside the pool. The height of the water inlet end of the U-shaped tube is higher than the highest water storage height in the water pressure room, and it acts as a water seal to prevent air leakage when the water is not released. U-shaped pipe water all flows out from the nozzle.

The invention has the following beneficial effects: simple facilities, low cost, no need for many or very complicated equipment; easy operation, only need to turn on the tap switch for more than ten minutes each time; improve the utilization rate of raw materials in the pool, realize the diversification of fermentation raw materials, Increase the gas production of biogas digesters; reduce the number of sick ponds and waste ponds caused by crusting problems, increase the utilization rate of biogas, generate energy, reduce pollution, and improve ecological effects.

Description of drawings

Fig. 1 is a structural schematic diagram of the device used in the water pressure biogas digester shell breaking method of the present invention.

In the figure: 1—digester, 2—fermentation liquid, 3—crust layer, 4—water mist, 5—air guide port, 6—atomizing nozzle, 7—water seal, 8—PE pipe, 9—water valve , 10-U-shaped tube.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1, a refraction atomization nozzle 6 placed above the crust layer 3 is arranged on the top of the biogas digester 1, and the refraction atomization nozzle 6 is installed on a water seal 7 with an air guide port 5, Make the atomizing nozzle vertically downward about 20 cm, connect the PE pipe 8 of the refracting atomizing nozzle 6 to form a U-shaped pipe 10 outside the pool, and the other end of the U-shaped pipe 10 is connected to the clear water outside the pool and is provided with a water valve 9 , the height of the water inlet end of the U-shaped tube 10 is higher than the highest water storage height of the water pressure room 11, and can play a role of water seal and air leakage prevention when no water is released. The bottom of the nozzle 6 is to prevent the siphon phenomenon, causing the water in the U-shaped pipe to flow out from the nozzle;

The clear water cracking method of the hydraulic biogas digester of the present invention is to use external clear water to enter the refraction atomizing nozzle 6 through the PE pipe 8 and the U-shaped pipe 10, and form a water mist 4 to spray on the crust layer 3 in a large area. Since the crust layer 3 itself is an organic matter, and carries some fermenting microorganisms in itself and during the process of floating up, after being wetted, the raw material starts to ferment and degrade again, and because the transverse tension of the raw material in the wetted part is also significantly reduced, The biogas and biogas slurry generated at the bottom will emerge from here, thereby breaking the crust and achieving shell breaking.

After discovering the encrustation in the biogas digester, the user opens the water valve 9 for more than ten minutes, allowing water to be sprayed to the top of the encrustation layer 3 through the atomizing nozzle 6, so that a certain area of raw materials on the top of the encrustation layer 3 is wetted, and the water valve is opened every day Turn it on and off once to prevent the wet ingredients from drying out again. For several days, the boiling time will gradually shorten. After the raw material is wetted, the lateral tension of the raw material will gradually decrease, and the raw material will start to degrade again at the same time. After a few days, the pressure of the water between the biogas and water pressure generated under the crust layer will cause the bottom biogas and fermentation liquid to overflow from the mouth. Thereby completing shell breaking, after shell breaking, the water level in the water pressure room will be significantly reduced. Since the amount of water needed to wet the raw material of the crust layer is negligible relative to the amount of water in the fermentation room, the newly added water has almost no effect on the fermentation microorganisms in the fermentation room. External clean water can be tap water, water pumped by the farmers themselves to the water tank and any other clean water that has a height difference from the biogas digester. If the volume of the fermentation room is greater than 20 cubic meters, it is recommended to install more than 2 nozzles. The installation position is based on the spraying distance, so that the water mist sprayed by all the nozzles can cover the crust layer as much as possible.

Example

Take the 8 cubic water pressure household biogas digester as an example, the fermentation raw material is mainly cow dung, if it has crusted, and the thickness of the crust is 20cm. Turn on the water inlet switch and water valve of the atomizing nozzle and spray clean water on the top of the crust layer for 15 minutes. The sprayed water is about 9 liters, and the water mist will wet a large crust layer in the center of the crust layer. The next day Turn on the switch for about 10 minutes, keep the humidity of the wet crusted raw materials, and keep the raw materials fermented. After about a week, stop spraying water. If the shell has not been broken, spray water for 10 minutes every 2 days, so about 10 days. Broken shell. The thicker the crust, the boiling water time can be lengthened accordingly, and the cracking time varies according to the thickness of the crust, the properties of the crust raw material, and the water spraying time. Using this device, if the water valve is opened once every 5-8 days, crusting can also be avoided.

Claims (2)

1. hydraulic type biomass pool clear water shell breaking method, it is characterized in that, top in methane-generating pit arranges at least one and places atomizer above the crust layer, the pipeline that connects atomizer forms U-shaped pipe and connects water valve then outside the pond, the crust back is by regularly evenly being sprayed on clear water the crust layer top in the methane-generating pit, crust layer segment position is drenched, again allow fermenting raw materials, raw material is by drenching and degrading, reduce the raw material horizontal tension, the biogas and the natural pond liquid that allow the crust layer produce below overflow by these positions, thereby break the crust layer, finish broken shell.

2. the device that adopts of hydraulic type biomass pool clear water broken shell, it is characterized in that, atomizer is installed above in methane-generating pit, the pipeline that connects atomizer forms U-shaped pipe outside the pond, the other end of U-shaped pipe is connected clear water outside the pond, and the water inlet one end height of U-shaped pipe is higher than water pressure house water storage topnotch, when not discharging water, play the effect of water seal anti-gas-leak, the bottom bending part of U-shaped pipe is lower than the shower nozzle bottom, to prevent siphonage, causes U-shaped pipe water all to flow out from shower nozzle.