Gas-and-solid-fired environment-friendly industrial boiler

Abstract

The invention discloses a boiler and particularly discloses a gas-and-solid-fired environment-friendly industrial boiler comprising a vertical boiler body. The boiler body is in a membrane wall structure. The inside of the boiler body is n-shaped. The boiler body is provided with a gas burner and a solid burner. The gas burner is located above the solid burner. A hearth forms an uptake flue which is communicated with a horizontal flue at the top of the boiler body. A convection tube bundle is disposed in the horizontal flue. A down-take flue is arranged at the rear of the boiler body and is communicated with the horizontal flue. An economizer and an air preheater are sequentially disposed on the down-take flue. The boiler body is provided with the gas burner and the solid burner both communicated with the hearth, so that boiler pollutant emission under low concentration is achieved by burning solid fuels such as coal and biomass and gases such as natural gas and liquefied gas, and the situations of severe pollution emission and difficulty in control are changed for the traditional industrial boiler.

Description

technical field [0001] The invention relates to a boiler, in particular to a gas-solid dual-combustion environment-friendly industrial boiler. Background technique [0002] More than 85% of the total number and total capacity of industrial boilers in use in my country are coal-fired industrial boilers. According to statistics, as of 2010, the total number reached 601,200 units, with a total capacity of 3.48 million steam tons and an annual coal consumption of nearly 700 million tons. Boilers emit large amounts of pollutants, second only to coal-fired power generation, and are the main source of urban air pollution. [0003] At present, the coal-fired industrial boilers in use are mainly chain furnaces, accounting for more than 85%. High, incomplete combustion of large particles of coal, high residual ash, low thermal efficiency of boilers, and difficulty in meeting pollutant standards. In recent years, my country has vigorously promoted the use of gas-fired boilers instead of...

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Problems solved by technology

[0003] At present, the coal-fired industrial boilers in use are mainly chain furnaces, accounting for more than 85%. High, incomplete combustion of large particles of coal, high residual ash, low thermal efficiency of boilers, and difficulty in meeting pollutant standards. In recent years, my country has vigorously promoted the use of gas-fired boilers instead of coal-fired boilers. The concentration is low, but the fuel used is mostly natural gas, which is highly dependent on the gas source, and there are problems such as gas explosion, unstable gas pressure, and high operating costs

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