Honeycomb straw fermentation system and fermentation method thereof

Abstract

The invention discloses a beehive type straw fermentation system and a fermentation method. The fermentation system comprises a fermentation device, wherein a plurality of filling units for directly filling straw are arranged in the fermentation device; the top surfaces of the filling units are positioned on the highest water line in the fermentation device; the bottom surfaces of the filling units are positioned at the lowest water line at the bottom of the fermentation device; each filling unit comprises a straw filling region and a fermentation liquid overflowing region positioned at the end part of the straw filling region; the two adjacent filling units are positively and reversely arranged in the fermentation device; the fermentation liquid overflowing regions in positive and opposite arrangement form a liquid baffling fermentation passage in the fermentation device; the liquid inlet end of the liquid baffling fermentation passage is connected with a liquid inlet pipeline, and the liquid outlet is connected with a circulation pipeline. The beehive type straw fermentation system and the fermentation method has the advantages that the full contact of anaerobes and straw can be effectively ensured; the fermentation concentration and the gas production efficiency of a fermentation reactor are improved; the pretreatment on the straw is not needed; the raw material pretreatment operation flow process of straw engineering is reduced.

Description

technical field [0001] The invention relates to a straw fermentation system, in particular to a beehive-type straw fermentation system and a fermentation method thereof, belonging to the field of biogas engineering. Background technique [0002] As a special raw material for biogas fermentation, crop straw has the characteristics of easy floating, difficult mixing (serious stratification), crusting, etc., which is very unfavorable for uniform mass transfer and efficient fermentation in fermentation equipment. In engineering applications, biogas fermentation devices with different economic inputs and different fermentation scales have appeared. These devices generally adapt to the requirements of the existing fermentation device for the characteristics of the fermentation material by changing the material characteristics of the straw - doing pretreatment such as crushing, so as to achieve the purpose of smooth feeding and discharging. For example, Chinese Patent Publication ...

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Problems solved by technology

The existing problems are as follows: 1. It is necessary to set a track inside the reactor to maintain the stability of the fermentation chamber, which requires a high level of construction of the fermentation system, and requires a high level of operation in the later operation and maintenance process, and the mass transfer effect is poor , obviously does not conform to the status quo of low level of operation and maintenance in rural areas

2. The patent does not fully consider the material exchange between the fermentation liquid and the straw fermentation area, which makes the straw pile larger, which is not conducive to the penetration and material exchange of the fermentation liquid

In addition, the device does not have an effective design for the flow field inside the fermentation device, which makes it impossible to achieve uniform creation and many fermentation blind spots

In this case, it is easy to cause too much organic acid in the straw fermentation area, which cannot be discharged in time. At the same time, the anaerobic microorganisms in the fermentation liquid cannot get enough organic matter for metabolism, so that the gas production rate of the fermentation device is not high.

[0006] In addition, in the straw biogas project in Germany, there is a "garage-style" two-phase fermentation process, a method of designing a spray port on the upper part of the fermentation device and a biogas blowing port at the bottom of the fermentation device, in order to achieve effective fermentation of straw materials and fermentation microorganisms. contact, but the piles of this type of straw are larger after soaking, and the gravity is greater. It requires a lot of power to turn the straw, and it is difficult to turn it evenly, so it is difficult to achieve the purpose of uniform mixing.

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