Thermal power plant coal pyrolysis system and peak regulation control and operation method

Abstract

The invention provides a thermal power plant coal pyrolysis system and a peak regulation control and operation method. A low-temperature pyrolysis device comprises a coal gas tar purification and separation device, a low-temperature dry distillation furnace and a high-temperature heat exchanger which are connected, and the low-temperature dry distillation furnace and the high-temperature heat exchanger are connected with a power station boiler; a heating heat source of the low-temperature dry distillation furnace is at least one of coal gas heated by the high-temperature heat exchanger, high-temperature flue gas in the power station boiler, high-temperature flue gas in an electric heating device, andhigh-temperature flue gas in an afterburning chamber; and any one of clean coal gas and targenerated by the coal gas tar purification and separation device and coarse coke generated by the dry distillation furnace enters the power station boiler to participate in combustion or be sold to the outside. According to the method, the raw coal does not need to be subjected to complex operations such as shaping or high-temperature coking, and is directly subjected to destructive distillationpyrolysis at 500-600 DEG C, so that the production process is simplified, the peak shaving requirement of a power plant is met, the additional value of a product can be increased, and the economic benefit is improved; and meanwhile, flue gas waste heat of the power station boiler is efficiently utilized, and transformation and operation cost is low.

Description

technical field [0001] The invention relates to the technical field of thermal power plants, in particular to a thermal power plant pyrolysis coal system and a peak regulation control and operation method. Background technique [0002] The study found that there are relatively high oil and gas resources in coal. Therefore, coal pyrolysis technology can improve the quality and utilization efficiency of coal, and the pyrolysis products coal tar and pyrolysis gas can be used as supplements to oil and natural gas. In conventional coal-fired thermal power plants, due to the rise in coal prices in recent years, the quality of coal entering power plant boilers has declined year by year, resulting in a decline in the combustion efficiency and boiler efficiency of coal-fired boilers. [0003] In the current large-scale coal pyrolysis process, there is a large amount of energy consumption and pollutant discharge. The coal pyrolysis process needs to consume a large amount of calorific...

AI Technical Summary

Problems solved by technology

In conventional coal-fired thermal power plants, due to the rise in coal prices in recent years, the quality of coal entering power plant boilers has declined year by year, resulting in a decline in the combustion efficiency and boiler efficiency of coal-fired boilers.

[0003] In the current large-scale coal pyrolysis process, there is a large amount of energy consumption and pollutant discharge. The coal pyrolysis process needs to consume a large amount of calorific value of the coal itself or the supplementary combustion gas, and the treatment cost of flue gas, waste water and other pollutants is high.

[0004] In addition, with the increase in the proportion of renewable energy power generation, more and more thermal power plants are facing a long-term low-load peak-shaving operation state, and it is difficult for existing power plant boilers to perform stable, high-efficiency, low-load operation

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