Process for increasing temperature of tail gas of biomass hot combustion gas

Abstract

The invention discloses a process for increasing temperature of tail gas of biomass hot combustion gas. The process sequentially comprises the following steps: (a) a biomass fuel is fed into a biomass gasification furnace; (b) clean hot combustion gas is obtained through the pyrolysis and gasification of the gasification furnace and enters a combustor; (c) a hot-air furnace enables normal-temperature air to be subjected to a heat exchange with part of the hot combustion gas, so as to form hot air of 500-900 DEG C which serves as combustion supporting air of the combustor; (d) after the biomass hot combustion gas and the matched hot air are subjected to a mixed combustion, the temperature of combustion flame can reach 1,500 to 1,700 DEG C, and the combustion flame is used for heating a kiln; (e) tail gas of the kiln is subjected to a heat exchange by an air heat exchanger, so normal-temperature air is heated to be hot air, and the hot air is introduced into the hot-air furnace and is mixed with the normal-temperature air; the hot air is heated to the design temperature requirement of 500 to 900 DEG C after the hot air is subjected to a heat exchange by the hot-air furnace; the temperature of waste gas, subjected to the heat exchange by the heat exchanger, is 150 to 200 DEG C, and the waste gas can be directly exhausted to the atmosphere. The process is applicable to the industries of glass, ceramics, casting, food and the like.

Description

technical field [0001] The invention relates to a gas technology after biomass gasification, in particular to a technology for raising the temperature of tail gas after biomass hot gas combustion. Background technique [0002] Gasification technology is a kind of three wastes such as agricultural and forestry waste and wood scraps as raw materials, and uses pyrolysis or gasification to produce high-temperature and clean gas. This gas can be widely used in boilers, various furnaces, tunnel kilns, Pyrolysis furnace and other combustion heating, suitable for glass, ceramics, casting, food and other industries. [0003] The air emission after biomass combustion can meet the 2014 air emission standard for boilers, and also meet the 2010 air emission standard for industrial kiln pollutants in ceramics, aluminum, copper and other industries. Biomass fuel is an environmentally friendly and renewable energy. It is a green energy that is vigorously promoted all over the world. It can...

AI Technical Summary

Problems solved by technology

The existing technology fully burns biomass fuel, and its combustion temperature is only 1200°C-1300°C. Because many industrial fields have extremely high requirements for combustion temperature, taking aluminum melting furnaces and glass furnaces as examples, the combustion temperature requirements are as high as 1500 ℃-1700℃, and the calorific value of biomass itself is not high (only 3500kcal / kg-4500kcal / kg), so if only the biomass fuel is fully burned, its combustion temperature is only 1200℃-1300℃, not Comply with temperature requirements

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