Heat supply system and method meeting high-parameter need of heat consumer

Abstract

The invention provides a heat supply system and method meeting the high-parameter need of a heat consumer. The system comprises a pressure adapter (5), a steam cooler (7) and a heat supply steam manifold (8), wherein two paths of steam sources, that is, high-pressure main steam and low-pressure reheat steam, are introduced into the pressure adapter (5), and an adjustment valve is installed in thetwo paths of heat supply pipelines separately; one path of the outlet of the pressure adapter (5) passes through a flow adjustment valve and the steam cooler (7), and then is connected with the heat supply steam manifold (8), and the other path is directly connected with the heat supply steam manifold (8) via the flow adjustment valve; and one path of gas outlet of the heat supply steam manifold (8) is connected to a heat supply pipeline connector (9) of the heat consumer, and the other path is connected to a re-cooling pipeline connector (11). The device meets the high-pressure grade need ofthe industrial heat consumer through the pressure matching of the high-pressure steam source and the low-pressure steam source; meanwhile, a water feeding temperature of a boiler is increased by adding the external steam cooler, a high-quality steam extraction flow is reduced, and gradient utilization for energy is realized, so that large-scale reconstruction for a heating surface of the boiler isavoided, the investment cost is greatly lowered, and the flexibility of heat supply is improved.

Description

technical field [0001] The invention belongs to the field of thermal power unit heat supply, and relates to a new heat supply system for meeting the needs of high-parameter heat users. Background technique [0002] At present, under the guidance of industrial policies, it is imperative to cut production capacity, adjust structure, and put pressure on environmental protection and environmental governance. It is imperative to shut down high-pollution and high-energy-consuming boilers. The development of large-scale central heating will definitely become a trend. Since some iron and steel and chemical enterprises have high requirements on steam quality, high-parameter heat users require steam pressure to reach above 4MPa and temperature to reach above 400°C. For the main heating supercritical 600MW or subcritical 300MW units, only the main steam and Two sources of steam for reheating steam can be satisfied. [0003] At present, for high-parameter industrial heat users, the con...

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Problems solved by technology

[0003] At present, for high-parameter industrial heat users, the conventional method is to use the main steam as the steam source to supply heat after decompression and decompression. If the heat supply flow exceeds the safe operating limit of the boiler, the heating surface of the boiler must be modified accordingly. This method not only The energy waste of high-quality steam is caused. Due to the boiler transformation, the transformation cost has increased significantly. If the heat supply to the heat user is stopped in the future, the heating surface of the boiler will be repeatedly transformed, and the flexibility of heating supply will be greatly restricted.

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