Internal combustion organization method of opposed firing pulverized-coal fired boiler

Abstract

The invention discloses an internal combustion organization method of an opposed firing pulverized-coal fired boiler, and belongs to the technical field of boiler pulverized-coal combustion. Accordingto the method, part of fuel for combustion enters a hearth directly in a jet flow mode through a fuel jet nozzle of a lateral wall, is mixed with hot smoke generated by combustors of a front wall anda rear wall and is combusted, and the rest of the fuel enters through the combustors of the front wall and the rear wall and is combusted. The fuel is supplied from the lateral wall, so that mixing of part of the fuel and secondary air is postponed, fractional combustion of the fuel is realized, and the NOx generation amount is further reduced. Meanwhile, through combustion of the fuel near the lateral wall, uniformity of fuel horizontal distribution in a boiler combustion area can be realized, the problem of ash accumulation caused by non-uniform distribution of fly ash of a top horizontal flute inlet due to original combustion organization is relieved, and stable operation of a unit is facilitated. The internal combustion organization method of the opposed firing pulverized-coal fired boiler is simple in design, facilitates combustion organization adjustment, and is low in comprehensive operation cost.

Description

technical field [0001] The invention relates to an internal combustion organization method of a counter-combustion pulverized coal boiler, and belongs to the technical field of boiler pulverized coal combustion. Background technique [0002] In my country, units of 300MW and below are gradually being replaced by large units. Therefore, the proportion of supercritical and ultra-supercritical units of 600MW and above in coal-fired thermal power units has been increasing. Among them, the boilers of most units adopt the opposite combustion method of the front and rear walls. [0003] However, in recent years, with the increasingly stringent environmental protection requirements for pollutant emissions from coal-fired power generation boilers, most generating units adopt low-nitrogen combustion technology and low-nitrogen combustion equipment to meet environmental protection requirements. Among them, the low-nitrogen combustion technology is mainly air staged combustion technolo...

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Problems solved by technology

[0004] However, the current research only focuses on the ignition near the jet outlet of the pulverized coal burner and the jet combustion organization in the early stage of combustion (such as setting the nozzle peripheral wind, wall-attached wind, etc.), and the post-combustion organization of the pulverized coal combustion in the direction of the furnace height. (such as adding side burn-out air to the front and rear walls), the design is complex, not easy to control, and cannot effectively solve the problem of high-temperature corrosion of the water-cooled wall of the boiler side wall

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