System using low-pressure steam extraction of steam turbine to heat raw coal for power generation

Abstract

The invention discloses a system using low-pressure steam extraction of a steam turbine to heat raw coal for power generation. The system comprises a heat exchanger (1), a coal bin (2), a coal feedingmachine (3), a coal mill (4) and a boiler (5), wherein the heat exchanger (1), the coal bin (2), the coal feeding machine (3), the coal mill (4) and the boiler (5) are connected in sequence. After being heated to be unfrozen through the heat exchanger (1) arranged below the ground of a coal yard, the raw coal in the coal yard enters the coal bin (2); then, the raw coal is delivered into the coalmill (4) to be made into powder through the coal feeding machine (3); and qualified coal powder is carried by primary air and enters the boiler (5) to be burnt. By means of the system, great significance is achieved for efficient utilization of thermal power generation units which burn high-moisture coal for use in cold areas of northern China.

Description

Technical field: [0001] The invention belongs to the technical field of steam turbine waste heat utilization for power generation, and specifically relates to a power generation system for heating raw coal by using steam turbine low-pressure steam extraction, which is suitable for generating sets in cold regions in 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 seeking ...

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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