Wide-load steam supply system suitable for deep peak regulation of thermal power generating unit

Abstract

The invention discloses a wide-load steam supply system suitable for deep peak regulation of a thermal power generating unit. A three-section steam extraction opening of an intermediate-pressure cylinder communicates with a heat release side inlet of a third high-pressure heater through a first valve set, and the three-section steam extraction opening of the intermediate-pressure cylinder communicates with an industrial steam supply system through a second valve set; the four-section steam extraction opening of the intermediate-pressure cylinder is divided into two paths after passing through a third valve set, one path is communicated with an inlet of a deaerator, and the other path is communicated with an inlet of a small pump feeding machine through a fourth valve set; the fourth-section steam extraction opening of the intermediate-pressure cylinder is communicated with a heat release side inlet of a fifth low-pressure heater through a fifth valve set; the steam exhaust port of the intermediate-pressure cylinder is divided into two paths, one path is communicated with an inlet of the low-pressure cylinder through a sixth valve set, and the second path is communicated with the inlet of the low-pressure cylinder through a butterfly valve; and the steam exhaust port of the low-pressure cylinder is communicated with the heat release side of the low-pressure heater. The system can meet the low-load and large-flow steam supply requirements.

Description

technical field [0001] The invention belongs to the technical field of industrial steam supply for large-scale thermal power plants, and relates to a wide-load steam supply system suitable for deep peak regulation of thermal power units. Background technique [0002] With the implementation of the sustainable development strategy, my country has gradually begun to focus on energy conservation in various fields. Many industrial developments use centralized steam supply models, especially power companies. The centralized steam supply of combined heat and power has developed relatively rapidly in my country. In recent years, with the rapid development of urbanization in my country, the scale of industrial parks around thermal power plants has continued to expand, and the amount of industrial steam supply has also continued to increase. Especially in the current deep adjustment of thermal power units Under the background of frequent peaks and low operating hours, higher requireme...

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Problems solved by technology

[0004] (1) Cold re-steam supply: The steam supply method is mature, the steam supply economy is relatively good, no special desuperheating is required, and the parameters are well matched. limited risk, the steam supply is small, and it needs to cooperate with the Zhonglian door parameter adjustment under low load, and the throttling loss is serious

[0005] (2) Hot re-steam supply: The steam supply method is mature, and the economy of steam supply is average. It needs special temperature reduction and pressure reduction for parameter matching. Since it is not subject to the risk of overheating of the boiler reheater, the steam supply volume is large, and the disadvantage is that it is low Under load, it is necessary to cooperate with the parameter adjustment of the Zhonglian door, the steam supply is small, and the throttling loss is serious

[0006] (3) Main steam extraction is equipped with back pressure machine residual pressure cascade utilization of steam supply: the steam supply method is relatively mature, the economy of steam supply is average, and the matching of steam supply parameters is high. The disadvantage is that it is limited by the risk of overheating of the boiler reheater , the steam supply is small

[0007] (4) Pressure matcher: high parameter matching, large steam supply, relatively good steam supply economy, the disadvantage is that it is noisy, has high requirements for the stability of high and low pressure steam sources, and poor steam supply performance under variable working conditions

[0008] (5) High and low side steam supply: the steam supply method is relatively mature, the steam supply volume is large, the disadvantage is that the steam supply economy is poor, the high side valve leakage risk is large, the throttling loss is large, and the site noise is large

[0009] It can be seen that the reliability and safety of the existing industrial steam supply methods are relatively poor in the context of deep peak shaving, and the economy of steam supply is poor under variable working conditions, especially unable to meet the demand for low-load and large-flow steam supply.

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