Preparation system and preparation method for biomass molding fuel

Abstract

The invention discloses a preparation system and a preparation method for a biomass molding fuel. The preparation system comprises a raw material pretreatment system, a low-temperature pyrolysis system, a high-temperature gasification system, a densification molding system and a boiler system. The preparation method comprises the following steps: performing low-temperature pyrolysis and high-temperature gasification on a dried and crushed biomass; mixing the obtained residues with dried and crushed sludge and an auxiliary raw material, and performing extrusion molding to obtain the biomass molding fuel. According to the preparation system disclosed by the invention, biomass gasification and biomass molding technologies are integrated, the whole system is in close connection to complement each other, the operating and maintenance costs are low, the obtained molding fuel is good in performance, the biomass is subjected to two-stage gasification by virtue of the preparation method, the gasification quality and efficiency are high, and the gasification residues are comprehensively utilized, so that the stabilization, quantity reduction, harmlessness and resource utilization of the sludge can be realized to the maximum extent.

Description

technical field [0001] The invention relates to the field of solid waste reuse, in particular to a system and method for preparing biomass briquettes. Background technique [0002] Since the beginning of the 21st century, energy and environmental issues have always been the central issues that all countries in the world are facing and are related to the sustainable development of the national economy. In order to alleviate and gradually solve this problem, countries all over the world are actively developing renewable new energy. [0003] my country is very rich in agricultural and forestry waste. In 2010, it produced 700 million tons of straw and 300 million tons of forestry residues. Since ancient times, agricultural and forestry wastes such as firewood and straw have been the most important fuels in rural areas of our country. However, with the improvement of people's living standards, more and more people choose to use fossil energy, and agricultural and forestry wastes...

AI Technical Summary

Problems solved by technology

[0006] At present, the pyrolysis of agricultural and forestry wastes is the main way of utilization of agricultural and forestry wastes, but there are common problems such as high tar content in pyrolysis gas, low pyrolysis efficiency, low quality of pyrolysis gas, corrosion of gasification equipment, blockage of gas pipelines, and hazards. Combustion equipment and other issues

In addition, in the gasification process, only part of the raw materials are gasified and utilized, while the ungasified solid residue containing combustible components is treated as waste, and the fuel cannot be fully utilized.

However, due to the high and unstable sludge moisture content, low density, low calorific value, high volatile content, and low fixed carbon content, the direct incineration of sludge has problems such as difficult ignition and unstable combustion.

In addition, the direct incineration of sludge still has problems such as high equipment investment and operating costs, the economic investment is too large, and there is no benefit at all.

Images