Boiler fuel pretreating device and boiler

Abstract

The invention relates to a boiler fuel pretreating device and a boiler. The boiler fuel pretreating device comprises a reaction pipe, a separation bent pipe, a first conveying pipe and a second conveying pipe. The reaction pipe is provided with a fuel inlet, and fuel enters the reaction pipe through the fuel inlet to be subjected to incomplete combustion. The separation bent pipe is arranged on the downstream of the reaction pipe and used for conducting gas-solid separation on combustion products, generated in the reaction pipe, of the fuel. The first conveying pipe is connected to the inward-sunken side of the separation bent pipe and used for sending separated gas into a hearth of the boiler. The second conveying pipe is connected to the outward-convex side of the separation bent pipe and used for sending separated solids into the hearth. According to the boiler fuel pretreating device and the boiler, the separation principle of the combustion products is that the gas and the solidsin the combustion products are separated through the separation characteristic of the corner of the separation bent pipe and the effect of centrifugal force, thus the gas and the solids are conveyed into the hearth, the separation structure is simple, operation and maintenance costs are low, and popularization is facilitated.

Description

technical field [0001] The invention relates to the technical field of boiler fuel combustion, in particular to a boiler fuel pretreatment device and a boiler. Background technique [0002] According to the requirements of the "Comprehensive Implementation of Ultra-low Emissions and Energy-Saving Transformation Work Plan for Coal-fired Power Plants", all qualified coal-fired power plants in the country must achieve ultra-low emissions by 2020, and the emission concentration of nitrogen oxides shall not exceed 50mg / m 3 . At present, most power plants in China use tail SCR denitrification technology to reduce pollutant emissions. The use of this technology requires a huge amount of SCR denitrification operation and maintenance costs every year, and the overall economic benefits are not good; The corrosion and blockage of the heater affect the safety of the boiler unit; moreover, the secondary pollution caused by the escape of SCR catalyst and ammonia cannot be effectively sol...

AI Technical Summary

Problems solved by technology

Although natural gas reburning can effectively reduce NO x concentration, the emission reduction rate can reach 70%, but the existing coal gasification device has a complex structure, high operating costs, and is not easy to promote. How to obtain reducing gas that meets the reburning ratio at low cost has become the biggest problem at present.

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