Pulverized coal burner and boiler with same

Abstract

The invention discloses a pulverized coal burner and a boiler with the same. The disclosed pulverized coal burner comprises a heat source and an internal burning chamber, wherein the internal burning chamber ensures that an internal pulverized coal flow has a predetermined excess air coefficient; the heat source is positioned in the internal burning chamber; the internal burning chamber is provided with an inlet, a long cylindrical main burning chamber and an outlet; the heat source can ignite pulverized coal which passes through the internal burning chamber and ensures that the pulverized coal reducibly burns in the internal burning chamber; preferably, the internal burning chamber comprises the main burning chamber and a decelerating inlet section; and the sectional area of the decelerating inlet section is less than that of the main burning chamber. The internal burning chamber of the pulverized coal burner can maintain a smaller air coefficient, so reducing atmosphere is formed inthe internal burning chamber; the pulverized coal reducibly burns in the internal burning chamber, so the pulverized coal flow enters a hearth in the form of high-temperature pulverized coal burning flame to improve the burning stability of the pulverized coal; meanwhile, the reducing burning can also convert a nitrogen element into a reducing intermediate product, so that fuel type nitrogen oxides are prevented from being produced.

Description

technical field [0001] The invention relates to a pulverized coal combustion technology, in particular to a pulverized coal burner, and also to a boiler with the pulverized coal burner. Background technique [0002] Currently, the combustion process of the boiler includes two stages: the first stage is the boiler ignition stage, and the second stage is the normal combustion stage. [0003] In the first stage, when the boiler is ignited, in order to ignite the pulverized coal, maintain the combustion of the pulverized coal, and increase the temperature of the furnace, it is often necessary to put in fuel for combustion to ignite the pulverized coal and increase the temperature in the furnace; After the temperature rises to a certain height, it enters the second stage of boiler combustion, that is, the normal combustion stage. [0004] In the normal combustion stage, the input of fuel oil is stopped, and after the pulverized coal enters the furnace, it is ignited under the ac...

AI Technical Summary

Problems solved by technology

The technical solution obtains enough fire through the fire interceptor to provide enough heat to ensure continuous combustion of the carbon powder; since the carbon powder is completely burned in the forced ignition internal combustion chamber, the heat of the carbon powder is released in the forced ignition internal combustion chamber , therefore, cannot be applied on the boiler

[0013] The second deficiency is: in the prior art, in order to improve the combustion efficiency of pulverized coal, higher temperature and higher oxygen concentration need to be maintained in the furnace

The timing and amount of supplementary combustion air become the key to the combustion performance of pulverized coal in the boiler. The supplementary combustion air should not be added too late, and the supplementary amount should not be too small, which limits the size of the reducing reaction area and the reduction combustion. degree, which weakens the effect of inhibiting the formation of nitrogen oxides; on the other hand, in order to create a reducing combustion area, the combustion atmosphere of pulverized coal is forcibly destroyed, which will inevitably affect the burnout of pulverized coal and the operation of the boiler. Efficiency has a negative impact

[0018] In short, the scope of the existing low-nitrogen oxide combustion technology is limited to the boiler furnace, and the effect of inhibiting the formation of nitrogen oxides is limited. At the same time, it will reduce the combustion efficiency of the boiler.

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