Straw densification briquetting fuel preparation method for biomass power generation and boiler combustion

Abstract

The invention provides a straw densification briquetting fuel (SDBF) preparation method for biomass power generation and boiler combustion, solving problems of low ash fusion point, easily coking, serious corrosion to boilers and the like of direct straw combustion. In the invention, straw is pre-processed through steam explosion or with diluted acid then is subjected to enzyme hydrolysis with cellulose, and the enzyme hydrolysis residue is briquetted to be used as fuel for biomass power generation or boiler combustion. The pre-processed and enzyme-hydrolysis straw can be briquetted easily; cellulose and hemicellulose in the pre-processed and enzyme-hydrolysis straw are removed basically, lignin content and calorific value increase, potassium ion, sodion and chloridion are removed, thereby improving ash fusion point of straw, reducing coking and boiler corrosion in combustion process, and improving combustion performance of straw. The straw solid fuel prepared by the invention can be used as fuel for common domestic boilers. Sugar produced by enzymolysis can be used as a fermentation carbon source for large-amount fermented products, so as to improve comprehensive utilization value of straw.

Description

technical field

[0001] The invention belongs to the field of high-value utilization of straw, in particular to a method for preparing briquette fuel for biomass power generation and boiler combustion. technical background

[0002] As the governments of various countries attach great importance to energy conservation and emission reduction and the introduction of a series of measures, straw combustion power generation technology is gradually industrialized. In my country, the State Grid Corporation's National Bio-Power Generation Group Co., Ltd. took the lead in realizing industrialization in 2006. Dozens of straw power plants have been established across the country, and Guodian Longyuan Power Technology Engineering Co., Ltd. has also established three straw power plants. Due to the low ash melting point of direct combustion of straw for power generation, it is easy to coke and corrode, that is, the temperature of the boiler combustion chamber can reach above 1000°C. Polluti...