Multi-burner pulverized coal combustion device

Abstract

The invention discloses a pulverized coal combustion device which is capable of combusting coal with poorer quality and aims at being used for an industrial boiler. The combustion device comprises an inner barrel and an outer barrel; and a pulverized coal start-up burner, a central burner, an annular burner, a sandwich secondary air port, a cyclone secondary air port and a direct secondary air port are arranged on the combustion device. When the start-up burner is in a stable burning state, the central burner and the annular burner can be guaranteed to stably and fully burn pulverized coal with different quality; and the burning temperature is controlled by cold air volume, so that a large amount of NOx pollutants can be prevented from being generated.

Description

technical field [0001] The invention proposes a combustion device capable of burning coal powder of different coal qualities, which is suitable for industrial production boilers, heating boilers and other fields, especially for industrial production and heating processes with large changes in boiler load. Under the condition that the heating surface of the boiler remains unchanged, the variable load operation of small and medium-sized pulverized coal boilers is realized. Background technique [0002] About 70% of China's energy structure is coal, which is mainly used for combustion, and about half of it is used for boilers. China has 500,000 to 600,000 industrial boilers, and these boilers are almost all coal-fired boilers except for the forced conversion to natural gas, with an annual coal consumption of more than 400 million tons. Among the coal-fired boilers, about 80% of them have a capacity of less than 20t / h, and the average capacity is about 4t / h or more, and most of...

AI Technical Summary

Problems solved by technology

The disadvantages of this combustion method are as follows: 1. The particle burnout time varies greatly and the grate running speed is fixed

2. The air permeability of layered combustion is uneven. Even if auxiliary layering methods can be used, the resistance of fine particles to the combustion air constitutes a huge hindrance to the combustion process

3. High reliance on operating technology

[0009] The patent application and granting of pulverized coal industrial boiler research is relatively simple. Although there were some patents in the last century (such as the pulverized coal burner for boilers suitable for various industrial and civil boilers proposed by Li Chunfu (application number 95111916.8)), many patents are in Deficiencies revealed during implementation lead to a halt in the use of pulverized coal in industrial boilers

Before 2005, there were few reports on the combustion of pulverized coal in industrial boilers, regardless of literature or patents

[0010] Researchers have tried to expand the fuel range of pulverized coal industrial boilers and localize the boiler fuel, but due to problems such as ignition difficulties and unstable boiler operation, they have to give up the effort to localize the fuel (Guo Yongbao, Wang Shouxin, Guo Fuyan , Zhang Ruihua, Discussion on several issues that should be paid attention to in the application of industrial pulverized coal boiler technology, Science and Technology Information Development and Economics, Volume 21, Issue 16, 2011)

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