Low-temperature drying and coal conveying integrated equipment for raw coal

Abstract

The invention discloses low-temperature drying and coal conveying integrated equipment for raw coal and belongs to the field of raw coal drying equipment. In a coal conveying room, a double-layer closed space is formed by an equipment outer shell and an equipment inner shell, air introduction pipelines are connected with the drying equipment inner shell, first water medium heaters are arranged at junctions of the air introduction pipelines and the drying equipment inner shell, a supporting structure, a second water medium heater and a rotating shaft are sequentially arranged inside a crawler from top to bottom, and thus, the low-temperature drying and coal conveying integrated equipment for the raw coal is formed; an outlet of the low-temperature drying and coal conveying integrated equipment is connected with a coal bunker, and external moisture drying for lignite, sub-bituminous coal and bituminous coal is completed while coal granules are conveyed; air drying tail gas is conveyed to chimneys with baffles through an air pipeline and then is exhausted into the atmosphere. According to the low-temperature drying and coal conveying integrated equipment for the raw coal, disclosed by the invention, the external moisture drying for the raw coal (lignite, sub-bituminous coal and bituminous coal) can be completed by using low-temperature drying heat sources of different types while the coal granules are conveyed, so that the efficiency of an electric power plant is increased.

Description

technical field [0001] The invention belongs to the field of raw coal drying equipment, in particular to a raw coal low-temperature drying and coal conveying integrated equipment. Background technique [0002] The characteristics of my country's fossil fuel reserves are "rich in coal, poor in oil, and low in gas". This feature determines that China's primary energy production and consumption structure will not change for a long time. As of the end of 2013, the installed capacity of coal-fired power generation has reached 817 million kilowatts, and the annual power generation has reached 3.94 trillion kilowatt-hours, and in recent years it has maintained an annual growth rate of 30-40 million kilowatts. On the other hand, the emissions of major pollutants such as dust, SO2, and NOx from coal-fired power plants accounted for 12.20%, 42.16%, and 41.59% of the country's total emissions, respectively. Therefore, further improving the operating efficiency of coal-fired power plant...

AI Technical Summary

Problems solved by technology

The presence of moisture in coal will reduce its low calorific value, and also limit the exhaust gas temperature of the boiler, thus reducing the utilization efficiency of coal

In addition, the moisture in the coal will directly affect the power consumption of the coal mill

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