Process technique for producing crop straw fuel

Abstract

Under the guidance of a national policy, a technique for producing a biomass fuel by using crop straws is developed slowly so that the development of a downstream energy-consumption industrial (power generation, industries, civilian uses and the like) technique is obstructed. The straws are only used by civilian parts, and most of the straws are burnt. Mainstream techniques developed on markets comprise a biomass fuel granule granulating machine and a ring model briquetting machine, and both machines adopt a mechanical force compression technical scheme and do not solve technical problems fundamentally. The technical scheme of the invention is that: according to physical and chemical properties of the main components namely cellulose, hemicellulose and lignin of the straws, the cellulose, the hemicellulose and the lignin are separated from one another under a certain process condition; the cellulose is promoted to swell and increase an inter-felting capacity; the hemicellulose and thelignin are transformed, degraded and condensed into a phenolic aldehyde condensation compound to play a role of phenolic aldehyde resin; under the action of mechanical force, the phenolic aldehyde condensation compound is compressed and formed, and the density of a product fuel brick is between 1 and 1.4 tons / cubic meter; and each ton of the straw biomass fuel is amounted to about 0.5 ton of standard coal.

Description

Technical field: [0001] The crop straw fuel production technology belongs to the technical field of biomass energy production. [0002] Energy is an important material basis for the survival and development of human society. Fossil energy such as coal, oil, and natural gas has become the dominant energy source for production and life. At present, the total annual global energy consumption has exceeded 15 billion tons of standard coal, of which about 90% is fossil energy. However, fossil energy is a non-renewable energy with limited reserves. According to the current level of energy consumption, by the middle of the next century, there will be very few major fossil energy resources left in the world. At the same time, the destruction of the ecological environment caused by the large-scale development and utilization of fossil energy is an irreversible deterioration of the ecological environment on which human beings rely for survival. As a developing country with rapid econ...

AI Technical Summary

Problems solved by technology

Most of the technology of the project comes from the water-cooled vibrating grate straw direct-fired power generation boiler technology introduced by Jinan Boiler Group from the Danish BWE company. Practice has proved that there are many problems in this project: the imported technology leads to high cost and large investment; Too low density leads to high transportation and storage costs; seasonal production of straw and bulk transportation, bulk storage, and scattered burning lead to fatal problems such as difficult balanced supply of fuel, which hinders the development of straw power generation industry

[0011] 1. The application of mechanism carbon rod making machine to press biomass fuel, the technical advantages are: fuel energy density is high, convenient for storage, transportation and suitable for burning in folk earth stoves; the disadvantage is: the application of raw materials can only add 30% crop straw, and the remaining 70% Wood chips must be used as raw materials, and it is necessary to develop new boilers, which are difficult to develop in terms of crop resource utilization and application to existing combustion equipment.

The technical advantage is: high fuel energy density. The technical advantage is: the fuel energy density is high, and crop straw can be used as raw material, which is convenient for storage and transportation; the disadvantage is that it is necessary to develop new special combustion equipment, which is difficult to develop in the aspect of being applicable to existing combustion equipment.

The technical advantage is: the energy density of the fuel is relatively high, and crop straw can be used as raw material; it is suitable for the combustion of folk stoves and some industrial boilers, especially in the fuel for power generation, and there is more room for development; the disadvantage is: because the energy density can only reach 0.7-0.8 kg / cubic centimeter, due to the relatively small density, the fuel block will disperse after absorbing moisture, which is not conducive to long-term storage