Pre-combustion mechanical grate decoupling combustion furnace and combustion method for same

Abstract

The invention provides a pre-combustion mechanical grate decoupling combustion furnace, which comprises a furnace body, a main grate (1) and a pre-combustion grate. A combustion chamber division wall (17) is arranged inside the furnace body, the internal space of the furnace body is generally divided into an upstream pre-combustion chamber (15) and a downstream main combustion chamber (18), the main grate (1) is arranged on the lower portion of the furnace body, the pre-combustion chamber (15) is positioned above the front of the main grate (1), the main combustion chamber (18) is positioned above the rear of the main grate (1), the pre-combustion chamber (15) is communicated with the main combustion chamber (18) through a flue gas channel above the division wall (17) and a coal bed channel below the division wall (17), and the pre-combustion grate is positioned in the pre-combustion chamber (15) and is arranged above the main grate (1) by a certain inclination angle, so that a coal bed runs to the main grate (1) along the pre-combustion grate. By the aid of the pre-combustion mechanical grate decoupling combustion furnace, pre-combustion load can be effectively matched with main combustion load, and the problem of flameout can be avoided while the running load of the decoupling combustion furnace is improved.

Description

technical field [0001] The invention relates to the field of coal combustion equipment, in particular to a pre-combustion mechanical grate decoupling combustion furnace and a combustion method thereof. Background technique [0002] The total number of coal-fired industrial boilers in my country is about 550,000, with an annual coal consumption of nearly 500 million tons. They mainly use layer combustion and most of them are chain furnaces. There are common problems such as low combustion efficiency and high pollutant emissions. Among them, nitrogen oxides (NOx) emitted by industrial boilers x ) accounted for NO in my country x 15% to 20% of the total emissions. Therefore, it is necessary to develop relevant emission reduction technologies to reduce the NOx of industrial boilers x emissions. [0003] Low NO for coal-fired industrial boilers x Combustion technologies mainly include low-oxygen combustion technology, flue gas recirculation combustion technology, air staged ...

AI Technical Summary

Problems solved by technology

However, it is still difficult to effectively control the pyrolysis rate of the oxidation pyrolysis chamber located above the mechanical grate, which leads to a poor match between the pre-combustion load and the main combustion load

The Chinese patent application with the publication number CN101650025 proposes a new decoupling combustion furnace and decoupling combustion method. Although the problem of the slow pyrolysis speed of the previous decoupling combustion boilers has been solved to a large extent, the pre-combustion The fire zone and the main combustion zone share a set of grate control mechanism, and there is no measure to maintain the pre-combustion fire source, and the pre-combustion speed is slow. When the load is large and the grate running speed is increased, the ignition source cannot be maintained in the pre-combustion zone. Live, it will be moved to the main combustion area by the grate, resulting in the interruption of combustion in the pre-combustion area, and finally the main combustion cannot be maintained, resulting in interruption of combustion

Therefore, in this scheme, it is difficult to greatly increase the combustion load of the pre-combustion chamber, so it can only meet the design requirements of small and medium-sized boilers with a capacity of less than 10t / h

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