Fluidization-suspension combined combustion boiler

Abstract

The present invention provides a liquefaction-suspension combined combustion boiler comprising a vertical combustion chamber arranged in routine boiler, the combustion chamber has a bubble fluidized-bed combustion section equipped with a feeder, fluidized bed slag discharge opening on bottom; the combustion chamber has a low-temperature reducing property main combustion section on lower portion and a high temperature oxidation combustion section on upper portion. The main combustion section on lower part of the combustion chamber comprises a primary air nozzle and auxiliary air ejector nozzle arranged on walls on opposite sides of the combustion chamber for mixture of primary air-fuel entering into the combustion chamber. The high temperature oxidation combustion section on upper portion of the combustion chamber has at least one layer of secondary air nozzle arranged above the primary air nozzle. The primary air-fuel mixture nozzle and the oppositely arranged auxiliary air ejector nozzle form a strong rotation-circulation flow field at lower part of the combustion chamber, which implements combustion of majority of fuel in main low-temperature and reducing property combustion section, uncombusted particle and fuel gas are combusted on upper portion of the combustion chamber. The invention has advantages of high combustion efficiency, low harmful substance discharge, simple structure, safe and reliable operation.

Description

technical field [0001] The invention relates to a combustion combined system using solid fuel, in particular to a fluidized-suspension combined combustion boiler. It is an innovation of traditional fluidized bed combustion and pulverized coal suspension combustion technology to obtain higher combustion efficiency and lower emission levels of harmful substances. Background technique [0002] For a long time, the direct combustion of solid fossil fuels (such as coal, etc.) has been an important factor that has caused serious damage to the environment in our country. At present, except for a few areas, the air pollution in my country is dominated by soot, and the main pollutants are suspended particulate matter (TSP), sulfur dioxide (SO 2 ), nitrogen oxides (NOx), etc. Due to the fact that my country's current coal production and consumption technology level and equipment capacity are difficult to meet the requirements of environmental protection, and the development and appl...

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