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A dry ozone pretreatment pretreatment tower and method for improving the enzymatic hydrolysis and saccharification rate of straw

A technology for pretreatment and saccharification rate, applied in the field of comprehensive utilization of crop straw resources, can solve the problems of lack of straw ozone pretreatment equipment, etc., and achieve the effects of improving storage stability, low equipment requirements, and preventing the loss of straw polysaccharide components.

Active Publication Date: 2018-06-19
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Correspondingly, the equipment currently used for ozone pretreatment is only suitable for liquid treatment (such as patent CN202576407U), thus lacking equipment suitable for straw ozone pretreatment under solid conditions

Method used

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  • A dry ozone pretreatment pretreatment tower and method for improving the enzymatic hydrolysis and saccharification rate of straw
  • A dry ozone pretreatment pretreatment tower and method for improving the enzymatic hydrolysis and saccharification rate of straw
  • A dry ozone pretreatment pretreatment tower and method for improving the enzymatic hydrolysis and saccharification rate of straw

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1: Batch operation scheme of straw dry ozone pretreatment tower

[0046] Crush the straw according to certain requirements, and adjust the moisture content of the straw powder (for details, refer to Examples 3, 4, and 5). The initial state of the pretreatment tower: the outlet 10 is closed, and the bottom sieve plate 6 is in a horizontal state, which is called "closed". The feed hopper 1 is opened, and the middle sieve plate 6 and the upper sieve plate 6 are in a vertical state, which is called “opening”. Feed to the pretreatment tower. After the material layer on the lower sieve plate 6 reaches the specified height, close the middle sieve plate 6 and continue feeding to the specified height. By analogy, the feeding of the upper sieve plate 6 is completed. After feeding, close the feed hopper 1. The ozone gas stream with specified concentration and flow rate is introduced, and the ozone concentration discharged from the pretreatment tower is monitored at the s...

Embodiment 2

[0047] Example 2: Semi-continuous operation scheme of straw dry ozone pretreatment tower

[0048] Crush the straw according to certain requirements, and adjust the moisture content of the straw powder (for details, refer to Examples 3, 4, and 5). The initial state of the pretreatment tower and the feeding operation are the same as in Example 1. The ozone gas stream with specified concentration and flow rate is introduced, and the ozone concentration discharged from the pretreatment tower is monitored at the same time. When the concentration of ozone discharged from the pretreatment tower is not zero, stop feeding the ozone, open the discharge port 10 and the bottom sieve plate 6, and discharge the bottom sieve plate 6 material. Close the bottom sieve plate 6 and the discharge port 10 again, and open the middle sieve plate 6 at the same time, so that the material originally positioned at the middle sieve plate 6 is placed on the bottom sieve plate 6 . By analogy, put the mate...

Embodiment 3

[0049] Example 3: Dry ozone pretreatment scheme 1 for corn stalks

[0050] In this scheme, the operation of pretreatment tower adopts batch type. The corn stalks are coarsely crushed and passed through a 20-mesh sieve, and then finely crushed and passed through a 300-mesh sieve. Adjust the moisture content of straw powder to 60%. Treat under the conditions of ozone concentration 60mg / L and air flow 5L / min. The lignin degradation rate of the final straw reaches 75%, and the cellulose hydrolysis rate reaches 80% (10% for untreated straw).

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Abstract

The invention relates to a dry-method ozone pretreatment pretreater capable of increasing the straw enzymolysis saccharification ratio. The dry-method ozone pretreatment pretreater comprises a vertically arranged pretreater body, a feed hopper located on the top of the pretreater body and a discharge port formed in the bottom of the pretreater body; the feed hopper is located in the center of the pretrater top, and a diffuser is arranged under the portion beside the feed hopper in the direction perpendicular to the pretreater body; the diffuser is shaped like a circular conical surface, the vertex of the circular conical surface vertically upwards points to the center of the feed hopper, and rod-like protrusions which are perpendicular to the circular conical surface bus direction are distributed on the circular conical surface in a staggered mode; a plurality of sieve plates perpendicular to the direction of the pretreater body are arranged in the middle of the pretreater body; the sieve plates are each shaped like a mesh, and the rod-like protrusions with different heights are evenly distributed on the sieve plates and are perpendicular to the surfaces of the sieve plates. The dry-method ozone pretreatment pretreater facilitates pretreatment of semi-continuous, automatic and intelligent operation; lignin of straw subjected to ozone treatment is removed, the biodegradation rate is obviously increased, sundry bacteria and pests are killed, the storage property and fermenting property of the product are improved.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of crop straw resources, in particular to a straw dry ozone pretreatment tower and a method for dry ozone pretreatment of straw based on the pretreatment tower. Background technique [0002] my country is rich in crop straw resources, but about 30% of the straw has not been effectively utilized. In vast rural areas, straw burning is still the mainstream treatment method, which not only causes a serious waste of straw resources, but also causes serious air pollution. In addition to the traditional extensive and low-value-added utilization methods such as straw returning to the field and straw silage, straw biorefining has gradually become a very promising straw utilization method, and has received more and more attention in recent years. [0003] The so-called straw biorefining refers to the technology of hydrolyzing straw into small molecular substances through biological method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12M1/00C12P19/14
CPCC12M45/06C12P19/14C12P2201/00
Inventor 陈正行李诚王莉王韧李永富罗小虎李亚男
Owner JIANGNAN UNIV
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