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Marsh gas reactor with crusting resistance device

A reactor and crusting technology, applied in the field of biogas reactors, can solve the problems of easy damage to the air tightness of biogas reactors, damage to the continuous use of biogas, and reduced service life of fermentation tanks, and achieve obvious anti-crust performance and structure Simple, prolonged exposure effects

Inactive Publication Date: 2010-06-09
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the main methods for treating the surface scum and crust are as follows: 1. Use a stirrer to stir the surface scum and crust, but there is energy consumption, and the equipment is complicated, and it is easy to damage the airtightness of the biogas reactor and affect the fermentation effect , the moving speed of the material in the pool should not exceed 0.5m / s, which is the critical speed of microbial life; 2. High-level discharge and reflux recoil, artificially destroy the crust, but it is inconvenient to use and consumes a lot of manpower and material resources; 3. Use a screen A shell breaking device with a screen shape is fixed on the inner wall of the fermentation tank wall. The scale shell floats up and down with the action of air pressure and water pressure. Squeeze to move the scum, but it can't effectively break the crust. There are also "bamboo cages" to guide the air, and a bamboo cage with a diameter of 15cm is installed in the pool. The service life of the equipment is difficult to guarantee, and the effect is not obvious; method, which destroys the continuous use of biogas, and consumes manpower and material resources, which reduces the service life of the fermentation tank

Method used

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  • Marsh gas reactor with crusting resistance device
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Examples

Experimental program
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Effect test

Embodiment 1

[0022] 2000g of potato peels were used as the fermentation substrate, pretreated by stacking and retting for 7 days, and 2000ml of wild sewage sludge strains were collected respectively. The 30-day fermentation test was carried out in a container, and the TS concentration of the fermentation raw material was 3%. During the fermentation period, the gas production rate of the biogas reactor with anti-crust device is 0.248m 3 / (m 3 ·d), the raw material gas production rate is 223m 3 / (kg·TS), the wet weight of the suspended solids content is 6g, and the dry weight is 0.58g; the gas production rate of the biogas reactor without anti-crust device is 0.211m 3 / (m 3 ·d), raw material gas production rate 190m 3 / (kg·TS), the wet weight of suspended solids is 181g, and the dry weight is 19.5g. The comparison found that the gas production of the biogas reactor with anti-crust device increased by 17.5%; compared with the methane content, the biogas reactor with anti-crust device was...

Embodiment 2

[0024] Take 2000ml of fermented biogas slurry as an inoculum, 2000g of potato peels are pretreated for 7 days by composting and retting, and as a fermentation substrate, they are fermented in a reactor with an anti-crust device at a normal temperature of 27°C for 30 days, and the TS concentration of the fermentation raw material is 6 %, the gas production rate of biogas reactor with anti-crust device is 0.882m 3 / (m 3 d), while the conventional fermentation tank is 0.3m 3 / (m 3 · d), it can be seen that the pool capacity of the biogas reactor with the anti-crust device is increased by nearly 194%, and the utilization rate of raw materials is obviously improved. And there is almost no suspended solids on the liquid surface. The biogas slurry COD removal rate is as high as 71.7%, and the raw material gas production rate is 600m 3 / (kg·TS), and the concentration of methane in the produced gas exceeds 70%, and the quality of the produced gas is high.

Embodiment 3

[0026] Take 2000ml of fermented biogas slurry as the inoculum, respectively use 2000g of potato peels as the fermentation raw material, stack retting pretreatment for 7 days, and add the anti-crust device and no anti-crust device respectively at room temperature of 27°C. Biogas reactor, fermentation raw material TS concentration is 6%, fermented for 30 days, the gas production of the biogas reactor with anti-crust device is 180-200ml, and the gas production of biogas reactor without anti-crust device is 150-170ml. Compared with the two, with anti-crust The gas production of the biogas reactor of the crust device increased by 19.9%.

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Abstract

The invention discloses a marsh gas reactor with a crusting resistance device, which comprises a fermenting tank, a sealing cover and a crusting resistance device, wherein the sealing cover covers the fermenting tank; a marsh gas outlet hole is arranged on the sealing cover; and the crusting resistance device comprises slag baffle plates and a gas collecting cover with a horn structure. The gas collecting cover is arranged on the inner wall of the fermenting tank, and the opening faces downwards. A gas through hole I is arranged on the gas collecting cover. The slag baffle plates are staggered and arranged on the periphery of the inner wall of the gas collecting cover, and form a certain included angle with the horizontal plane. As the gas collecting cover with the horn structure is arranged in the fermenting tank, and the slag baffle plates are staggered and arranged on the periphery of the inner wall of the gas collecting cover, and form a certain included angle with the horizontal plane, when the gas pressure in the fermenting tank is changed, the marsh gas liquid fluctuates up and down, the marsh gas slag is sheared by the slag baffle plates in a nonuniform way, is abraded and extruded by the slag baffle plates, and is prevented from further floating onto the liquid surface, and then the invention prevents the marsh gas slag from crusting on the liquid surface, and also can break the formed crust.

Description

technical field [0001] The invention relates to a biogas reactor, in particular to a biogas reactor with an anti-crust device. Background technique [0002] In the traditional liquid fermentation biogas reactor, there is a phenomenon of biogas slurry stratification under static conditions: the biogas slurry is divided into bottom sediment layer, reactive layer, supernatant liquid layer and top scum layer from bottom to top. The main reason for the formation of scum crusts is that the biogas fermentation raw materials contain many solids and cellulose that are not easy to hydrolyze, most of which can be degraded by microorganisms to form biogas and biogas slurry, and the remaining biogas residues Floating on the surface of the liquid under the action of buoyancy. Since the hydrolysis rate of cellulose in the upper part of the biogas residue is lower than the rate of acid and methane production, the attached growth of microorganisms absorbs the soluble nutrients of the fermen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12M1/107
CPCC12M21/04Y02E50/343C12M27/20C12M23/36C12M23/38Y02E50/30
Inventor 王永忠朱恂廖强彭震王宏丁玉栋李俊叶丁丁
Owner CHONGQING UNIV
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