Extractable Pulverized Coal Boiler

Abstract

The invention discloses a pulverized coal boiler capable of exhausting smoke. The pulverized coal boiler comprises a boiler body in which a hearth is defined, a heat accumulation type rotary reversing heater, a smoke channel, an air passageway, a high-temperature smoke exhausting passageway and a smoke exhausting control unit, wherein the inlet end of the smoke channel is communicated with the hearth; the outlet end of the smoke channel is communicated with the heat accumulation type rotary reversing heater to feed smoke in the hearth into one of at least one pair of containing parts, and the smoke exchanges heat with a heat carrier contained in the containing part; a plurality of overheaters are arranged in the smoke channel; the air passageway is used for at least feeding air into the other containing part of the pair of the containing parts, so that a heat carrier contained in the other containing part exchanges heat with the air; one end of the high-temperature smoke exhausting passageway is communicated with one end, which faces the hearth, of the smoke channel, and the other end of the high-temperature smoke exhausting passageway is communicated with the outlet end of the smoke channel; the smoke exhausting control unit is used for controlling the amount of first smoke supplied by the high-temperature smoke exhausting passageway. According to the pulverized coal boiler capable of exhausting the smoke, combustion-supporting air entering the hearth can be fully preheated, so that coal can be stably and fully combusted.

Description

technical field [0001] The invention relates to the field of industrial technology, in particular to an extractable pulverized coal boiler. Background technique [0002] At present, the coal used in pulverized coal boilers in my country includes lignite, long-flame coal, non-caking coal, gas coal, lean coal and a small amount of anthracite, among which lignite, long-flame coal and non-caking coal with high volatile content are the most used. my country is rich in anthracite coal reserves, accounting for about 19% of the total coal reserves. However, anthracite has low volatile content and is not easy to burn out. In the process of utilization, there are low energy system efficiency, low thermal coal products, and serious pollution emissions. question. W flame boiler is the main type of furnace for burning low volatile coal. It basically solves the stability and reliability of the operation of large boilers using low volatile for power generation, but there are still problems...

AI Technical Summary

Problems solved by technology

However, the existing pulverized coal boilers use metal air preheaters for flue gas preheating and recovery. The air required for preheating pulverized coal is limited by the structure and material of the metal heat exchanger itself. Preheating recovery, the energy saving effect is poor, and the temperature of the preheating air is low, usually only up to 300-400°C

In addition, there are also low-temperature corrosion problems in the operation of the metal corrugated plate rotary air preheater, and due to the narrow gas circulation channel, it is easy to cause problems such as ash accumulation and clogging

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