Five-coproduction process for comprehensively utilizing biological straw

Abstract

The invention discloses a five-coproduction process for comprehensively utilizing biological straw, aiming at solving the technical problem of expanding the straw utilization scale. The process consists of three lines: the first line is used for producing xylooligosaccharide: smashing biological straw, introducing steam for boiling, passing through an ultrafiltration membrane-1 after filter pressing, passing through an ultrafiltration membrane-2 after enzymatic hydrolysis reaction, enabling penetrating fluid to be subjected to nanofiltration concentration so as to be concentrated by 3-5 timesto obtain the xylooligosaccharide; the second line is used for producing straw pulp and sodium lignosulfonate: smashing the biological straw, enabling the smashed biological straw and waste residue tobe subjected to pressurized high temperature boiling together, enabling obtained serous liquid to be subjected to filter pressing separation, and enabling solid matter obtained after separation to besubjected to adverse current cleaning to obtain wheat straw pulp; enabling black liquor and washing black water obtained after separation to evaporate and concentrate, then performing heat exchange via hot-blast air to obtain sodium lignosulphonate powder; and the third line produces biochar and combustible pyrolysis gas. On the premise of generating remarkable economical benefit, the five-coproduction process is friendly to environment and does not generate waste water so as to achieve zero discharging, solid waste does not exist, and the exhaust gas reaches the standard and is emitted.

Description

technical field [0001] The invention relates to the technical field of biochemical industry, in particular to a five-generation process for comprehensively utilizing biological straws. Background technique [0002] In our country, when summer and autumn are harvested every year, a large amount of wheat and corn stalks are always burned in the field, which not only causes smog, pollutes the environment, but also causes serious waste of resources. Biological straws such as wheat and corn are multi-purpose biomass resources. Straws contain organic matter such as cellulose, hemicellulose, lignin, crude protein, and enzymes, as well as nutrients such as nitrogen, phosphorus, potassium, calcium, and magnesium. . [0003] For example, biological straw can be directly used as feed for herbivores, but it has poor palatability and low feed intake. Generally, after straw ammonification treatment, the crude protein is increased from 3% to 4% to about 8%, the digestibility of organic m...

AI Technical Summary

Problems solved by technology

However, the existing problem is that it is basically based on individual families, coupled with the shortage of labor force, it has not formed a scale

However, the problem is that the number of large-scale cattle and sheep farms is small and scattered, and the proportion of large-scale breeding is low

However, the existing problem is that the greenhouse vegetable planting area is very small and scattered, and the proportion of straw utilization is low.

However, the production scale of straw comprehensive utilization is generally small, the technical level is low, and the economic benefits are poor.

[0012] There are still many problems in the utilization of straw energy, mainly as follows: a. The proportion of straw used in biomass power generation is low; at present, the existing straw power plants in the country can consume nearly 40 million tons of straw a year, and the actual use of straw is about 18 million tons ; b is the problems of small scale and low-grade products in straw pyrolysis gasification and "charcoal-gas-oil" co-production projects, especially the centralized gas supply project of straw gasification; c is that although the solidification of straw has been formed The production capacity scale is 5.6 million tons, but due to factors such as unsuitable special stoves, the actual annual utilization of straw is less than 2 million tons

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