Power generating system utilizing circulating cooling water to heat raw coal

Abstract

The invention provides a power generating system utilizing circulating cooling water to heat raw coal. Raw coal in a coal field enters a coal cabin after being heated and unfrozen by a heat exchangerarranged under the ground of the coal field, and then the raw coal is fed into a coal mill through a coal feeder so as to be pulverized; qualified pulverized coal is carried into a boiler through primary air so as to be burned; exhausted steam of a steam turbine enters a steam condenser to release heat, then the exhausted steam is fed into a low-pressure heater through a condensate water pump, isheated and then enters a deaerator, generated steam is fed into a high-pressure heater through a feed pump and then enters the boiler to absorb heat, steam with the corresponding parameters returns tothe steam turbine to act, and the steam turbine drives a power generator to generate power; and exhausted steam of the steam turbine exchanges heat with circulating cooling water in the steam condenser, part of heated circulating cooling water is fed into a raw coal heater through a water pump, after raw coal heating, the part of heated circulating cooling water is converged with the other part of circulating cooling water which passes through a circulating water pump and then fed into a cooling tower to be cooled, and cooled circulating cooling water is fed into the steam condenser again toachieve circulation. The power generating system has important significance to efficient utilization of a thermal power generation unit which fires high-moisture coal.

Description

Technical field: [0001] The invention belongs to the technical field of power generation by comprehensive utilization of waste heat of generating sets, and in particular relates to a power generation system for heating raw coal by using circulating cooling water, which is suitable for generating sets in the cold regions of northern my country. Background technique: [0002] The winter temperature in the cold regions of northern my country is generally lower than minus 10°C. Raw coal, especially high-moisture raw coal, is easy to freeze during storage in the coal yard, which is not conducive to coal yard management and coal loading, and may easily cause blockage of coal bunkers and affect the drying of coal mills. The output and even the load capacity of the boiler reduce the operating economy of the unit. [0003] With the country's increasing emphasis on energy conservation and emission reduction, manufacturing plants, design institutes, and research institutes are actively ...

AI Technical Summary

Problems solved by technology

From the system power generation efficiency η cp From the calculation formula, the boiler efficiency η b Usually above 91%, there is room for further improvement but not high; pipeline efficiency η p and mechanical efficiency η m Up to 99.0%, power generation efficiency η g reached 99.5%, which are already at a very high level; while the steam turbine efficiency η i Usually within 48%, which is the most important cause of low power generation efficiency of the system

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