Method for relieving high-temperature corrosion of water wall in furnace by controlling fineness of full-load pulverized coal

Abstract

The invention discloses a method for relieving high-temperature corrosion of a water wall in a furnace by controlling fineness of full-load pulverized coal. Through an experimental investigation, theregulating characteristics of a coal mill dynamic separator, the change rules of the high-temperature corrosion under different loads, the influence rule of the fineness of the pulverized coal on thereducing atmosphere of the water wall and the like can be obtained, related experimental results are formed into a control logic, the fineness of the full-load pulverized coal is adjusted, so that theoccurrence of the high-temperature corrosion under different loads is relieved and prevented. According to the method, the automatic control of the fineness of the full-load pulverized coal can be achieved, when a boiler operates under different loads and in different coal mill operation modes, the fineness of the pulverized coal can be guaranteed to be within a reasonable pulverized coal fineness range, so that the occurrence probability of the high-temperature corrosion is greatly reduced; the combustion state in the furnace is improved, the heat loss of unburned CO and the heat loss of unburned carbon in the furnace are reduced, so that the energy-saving and consumption-reducing effects are achieved; and the pulverized coal avoids being ground into too small particles, so that the output of the coal mill is increased, the unit consumption for preparing the pulverized coal is reduced, and the effects of saving energy and reducing consumption are achieved.

Description

technical field [0001] The invention relates to a method for alleviating high-temperature corrosion of a water wall in a furnace by controlling the fineness of full-load pulverized coal, and belongs to the field of alleviating high-temperature corrosion. Background technique [0002] High-temperature corrosion on the flue gas side of boiler water-cooled wall refers to the corrosion phenomenon that occurs in the high-temperature flue gas environment of the water-cooled wall tube, which is caused by chemical or electrochemical reactions between metal materials and sulfur, chlorine and other elements in the ambient atmosphere at high temperatures. deterioration or destruction. In coal-fired power plant boilers, there are mainly three types of high-temperature corrosion: sulfate type, chloride type and sulfide type. The sulfate type mainly occurs on the high-temperature heating surface, such as the superheater and reheater of the boiler; the chloride type mainly occurs on the s...

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Problems solved by technology

However, in the case of little change in coal quality, power generation companies are still accustomed to maintaining a fixed separator speed, which makes the fineness of coal powder fluctuate greatly under different loads, and the combustion situation in the furnace tends to deteriorate under partial loads, resulting in different The difference in the high temperature corrosion state in the furnace under load is obvious

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