System for assisting coal-burning boiler to generate power by utilizing solar energy and waste heat of ash residue

Abstract

The invention discloses a system for assisting a coal-burning boiler to generate power by utilizing solar energy and the waste heat of ash slag in the technical field of design and manufacture of power generation equipment of the coal-burning boiler. The system comprises the coal-burning boiler, a solar heat-collecting field, a solid waste-heat recovery device, a heat storage device and an oil-water heat exchanger, wherein the solid waste-heat recovery device is connected with the coal-burning boiler by a slag discharging channel; the heat storage device and the solid waste-heat recovery device are connected in series by a first oil-pipe loop; the oil-water heat exchanger and the heat storage device are connected in series by a second oil-pipe loop; two circulation pipelines of the solar heat-collecting field are connected into the second oil-pipe loop in parallel; the oil-water heat exchanger is provided with a water feeding pipeline; the water feeding pipeline is connected with a water pipe between any two adjacent heaters of the coal-burning boiler in parallel to form a water feeding loop. The system disclosed by the invention has the advantages that the recovery and the utilization of waste heat of a power generation unit are realized, the operation stability of the system is guaranteed and the discharging amount of pollutants in the production process of a power plant is reduced.

Description

technical field [0001] The invention belongs to the technical field of design and manufacture of coal-fired boiler power generation equipment, and in particular relates to a system for assisting coal-fired power generation by using solar energy and waste heat from ash residue. Background technique [0002] At present, my country's traditional thermal power generation units are facing many problems in the process of generating electricity. The rise of primary energy prices, the requirements of national energy conservation and emission reduction policies, and the regulation of electricity prices are all closely related to the economical and effective operation of traditional thermal power generating units. As a renewable energy source, solar energy will have an important impact on my country's future energy development. However, due to the high investment cost of solar thermal power generation, the relevant promotion is only in the preliminary stage. Solar-assisted coal-fire...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a system that uses solar energy and ash waste heat to assist coal-fired boilers to generate electricity, which is used to solve the problem that the existing solar-assisted coal-fired thermal power generation systems are easily affected by time, seasons and environmental factors, and then switch frequently The problem of system instability caused by steam extraction of high pressure heater and low pressure heater

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