Efficient biogas fermentation system

Abstract

The invention discloses an efficient biogas fermentation system. The system comprises a fermentation tank; an excrement inlet is formed in one end of the side surface of the fermentation tank; a residue outlet is formed in the bottom of the fermentation tank; a residue discharging and stirring device is installed in the middle of the upper surface of the fermentation tank in a penetrating mode; acrushed straw conveying pipe is arranged at one end of the inclined surface position of the upper surface of the fermentation tank; a temporary storage bin is fixedly installed at one end of the crushed straw conveying pipe; a pretreatment device is fixedly installed at the upper end of the temporary storage bin; an exhaust pipe is arranged at the other end of the inclined surface position of theupper surface of the fermentation tank; a gas storage tank is fixedly connected to one end of the exhaust pipe; and a sludge pump is arranged at the bottom in the fermentation tank and is fixedly connected with the residue outlet. According to the invention, by arranging the residue discharging and stirring device, residues in slurry can be uniformly and thoroughly cleaned, so that the overall sealing performance of the fermentation tank is guaranteed; and in addition, the residue discharging and stirring device is simple in structure and easy to mount and dismount.

Description

technical field [0001] The invention relates to the technical field of biogas engineering, in particular to an efficient biogas fermentation system. Background technique [0002] Biogas fermentation, also known as anaerobic digestion and anaerobic fermentation, refers to organic matter (such as manure, straw, weeds, etc.) under certain moisture, temperature and anaerobic conditions, through the catabolism of various microorganisms, and finally forms The process of combustible mixed gases such as methane and carbon dioxide. The biogas fermentation system is based on the principle of biogas fermentation, that is, when microorganisms live and reproduce in the absence of oxygen, in order to obtain the energy required for respiration, the high-energy organic matter is decomposed and converted into Simple low-energy components, which release energy for metabolism, are essentially the process of microbial material metabolism and energy metabolism. The biogas fermentation system aim...

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Problems solved by technology

[0004] In the process of realizing the present invention, the inventors have found that at least the following problems in the prior art have not been resolved: 1. The slag discharging device in the prior art continuously pushes the slag slurry in the fermentation tank into the conveying screw under the action of the impeller. The slag liquid is separated in the screw, the slurry is returned to the fermentation tank, and the slag is discharged, which solves the problem of scum and crusts in the fermentation tank of large and medium-sized mixed raw material fermentation biogas projects, resulting in difficult discharge. When in use, the impeller has limited adsorption capacity and cannot absorb the slag slurry inside the entire fermenter, resulting in incomplete cleaning of the residue. At the same time, because the slag discharge device is always in operation, the existence of the conveying screw greatly improves the overall sealing of the fermenter. Reduced, and then unable to provide the anoxic environment required by the bacteria in the slurry, resulting in slow microbial metabolism and decomposition, resulting in reduced gas production. In addition, because solid materials such as plant straws are not easy to decompose, when entering the conveying screw, it is easy to cause the conveying screw to be blocked. , but the structure of the existing technology is complicated, it is not easy to install and disassemble for cleaning, which increases the maintenance cost; 2. In the prior art, the plant straw is not crushed when it is put into the fermentation tank, and it is easy to form scum and crust on the liquid surface during fermentation , causing the fermentation bacteria to decompose slowly, reducing the gas production efficiency. At the same time, the straw is easy to cause the slag outlet to be blocked during slag discharge, which is not conducive to slag discharge.

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