Large-scale fixed bed biomass gasification furnace and production process of gas with low oxygen content

Abstract

The invention discloses a biomass (especially briquette straw) gasification furnace, in particular a fixed bed gasification furnace with an anticorrosion liner which can effectively prevent corrosion of alkali metals on the furnace wall. The gasification furnace comprises a charging device (1), a gas discharge port (2), a furnace body (3), a grate (4), a dust discharge port (5), an air inlet (6) and the like. The raw material is continuously added from the upper part and moves downwards under the action of gravitation to form a stable reduction layer (completely reacts with oxygen in air), and slag is discharged from the bottom; and air enters from the lower part, and gas is discharged from the upper part. The inner diameter of the gasification furnace is 3 m, the height is more than 3 m, and the gasification intensity is at least 100 m<3> / (m<2>h). The carbon conversion rate of the gasification furnace can reach 95%, and the oxygen content of gas can be below 0.6%. The invention has the advantages of high production capacity, long operating cycle and good gas quality, and can be used for combustion or power generation.

Description

technical field [0001] The invention relates to a large-scale fixed-bed biomass gasification furnace and a production process of low-oxygen gas, belonging to the field of biomass gasification. Background technique [0002] At present, energy and environmental issues have become the focus of global attention. Conventional energy sources (such as coal, oil and natural gas) are increasingly depleted and seriously pollute the environment, so it is very important to develop clean and renewable energy. Biomass is the only renewable energy that can be stored and transported, and its efficient conversion and clean utilization have attracted increasing attention from all over the world. my country is rich in biomass resources, with a theoretical annual output of about 5 billion tons. The annual output of crop straw alone is over 700 million tons, equivalent to about 300 million tons of standard coal. However, the current use of straw biomass in rural areas in my country is very unr...

AI Technical Summary

Problems solved by technology

Compared with coal, biomass (especially straw) mostly has low bulk density, large natural accumulation (bridging and perforation are prone to occur in the gasifier), and low mechanical strength of charcoal (cannot maintain the original shape, and is easy to Cavities are formed in the reaction layer, resulting in uneven airflow distribution) and low ash melting point (<1050°C, difficult solid slag removal) and other disadvantages

Images