System for heating hot primary air of coal-fired boiler by groove type solar heat-conducting oil heat-collecting working medium

Abstract

The invention provides a system for heating hot primary air of a coal-fired boiler by a groove type solar heat-conducting oil heat-collecting working medium and relates to the technical field of new energy utilization. The invention aims to solve the problem that the temperature of the hot primary air of the boiler cannot meet the requirement caused by the fact that the drying output of a coal mill is insufficient when the water content of a coal type for combustion of a power plant is high. A renewable solar resource is coupled with the coal-fired boiler to form a high-energy-level utilizingsystem of solar energy. Heat of solar energy resources is collected into heat-conducting oil by a solar heat collector, the obtained high-temperature heat-conducting oil exchanges heat to the hot primary air of a boiler preheater outlet through a heat exchanger, the hot primary air is heated, the temperature of the hot primary air reaches to a boiler design value and the hot primary air serving asa drying agent of a pulverizing system enters the coal mill, so that the drying capability of the pulverizing system is improved, combustion air distribution reaches to an ideal effect, the boiler can operate at full load, and the problems of high-water-content coal for combustion and insufficient drying output of the coal mill can be solved completely.

Description

technical field [0001] The invention belongs to the technical field of new energy utilization, and in particular relates to heating primary air of a coal-fired boiler by using solar energy. Background technique [0002] At present, due to factors such as fluctuations in thermal coal prices and other factors, the actual coal quality used by many power plants is often not the design coal quality. Sometimes, in order to pursue higher efficiency, there is a big difference between the coal quality burned by the power plant and the design coal quality. When the moisture content of the coal type actually used is higher than that of the originally designed coal type, it will lead to insufficient drying output of the existing coal mill in the power plant. Temperature to increase the temperature of the hot primary air, resulting in the temperature of the boiler hot primary air not reaching the design value, which is unfavorable to the combustion of pulverized coal in the boiler, resul...

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Problems solved by technology

[0003] The invention aims to solve the problem that when the coal used in the power plant has high moisture content, the drying output of the coal mill is insufficient, resulting in the problem that the temperature of the hot primary air of the boiler cannot meet the requirements. Primary air heating system for coal boiler

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