A raw material pretreatment system and method for preparing biogas

Abstract

The invention provides a raw material pre-treatment system for preparing marsh gas. The raw material pre-treatment system comprises a stirring tank, a blanking device, a raw material sectional conveying device and a raw material storage device, wherein the stirring tank is provided with a stirring device and a raw material slurry outlet; the blanking device is arranged above the stirring tank; the blanking device is arranged along the vertical direction; a blanking inlet is arranged at the top of the blanking device and a blanking outlet is arranged at the bottom end of the blanking device; the blanking outlet is communicated with the stirring tank; a spraying nozzle is arranged at the inner side of the blanking device; a discharging hole of the raw material sectional conveying device is communicated with the blanking inlet; the raw material sectional conveying device is provided with a discharging hole and a feeding hole; the raw material storage device is communicated with the feeding hole. Compared with the prior art, the raw material pre-treatment system for preparing the marsh gas, provided by the invention, adopts sectional conveying and water spraying treatment is carried out on unit raw materials which are conveyed section by section before stirring, so that the concentration of raw material slurry is accurate and a subsequent stirring process is easy to carry out, and furthermore, power consumption of the system is reduced and the system efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of biogas engineering, in particular to a raw material pretreatment system and method for preparing biogas. Background technique [0002] Anaerobic fermentation of biogas refers to the catabolism of organic substances, such as human, livestock and poultry manure, straw, weeds, etc., under certain moisture, temperature and anaerobic conditions, through the catabolism of various microorganisms with a large number and different functions. , a complex biochemical process that eventually forms mixed gases such as methane and carbon dioxide. [0003] At present, the pretreatment of raw materials in the operation process of biogas projects - the mixing and mixing link plays a pivotal role in biogas projects. Most of the manpower and power consumption in biogas projects are in the raw materials pretreatment link. Except for the preprocessing link, almost no human intervention and investment are required. see figu...

AI Technical Summary

Problems solved by technology

The common disadvantage of the two methods is that due to the large diameter of the mixing tank (generally greater than 3m), and the limited length range of the blades of the mixer, in order to improve the mixing effect, it is necessary to increase the power of the mixer, which consumes a lot of power; in the actual operation process , the power of the mixer is usually about 5.5KW, and the speed is only 30r / min. If the mixer is 100m 3 The raw material slurry needs to be stirred for more than 3 hours, which is inefficient

In addition, the use of sewage pumps in the feeding method (2) will also increase the power consumption of the system

[0006] Secondly, the concentration of raw material slurry is difficult to achieve accurate

The above-mentioned feeding method must accurately measure the volume of raw materials before they arrive at the mixing tank each time, but the feeding method (2) uses water to flush into the tank because of multiple feedings, so it is difficult to measure the amount of flushing water and raw materials. Control, which eventually results in the daily statistics of the amount of feed to the anaerobic fermentation tank, increasing the difficulty

[0007] Again, in order to facilitate feeding, the raw material pretreatment process of the prior art usually arranges the stirring tank underground; and in order to control the diameter of the stirring tank, the depth of the pool is generally deep (about 3m underground), which makes the sand in the stirred raw material Both impurities and impurities settle at the bottom of the pool and need to be cleaned manually. Due to the influence of depth and odor, the work is very difficult

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