A full-load plant steam system for thermal power units

A technology for thermal power units and load plants, applied in pipeline systems, mechanical equipment, gas/liquid distribution and storage, etc., can solve problems such as frequent load changes, large throttling losses, unfavorable operations, etc., achieve broad application prospects and improve thermal efficiency Effect

Active Publication Date: 2016-03-02
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

On-site investigation found that due to the frequent load changes in the actual operation of the unit, the plant steam is switched between different steam sources, which is not conducive to operation and will cause large throttling losses

Method used

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  • A full-load plant steam system for thermal power units
  • A full-load plant steam system for thermal power units

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Embodiment Construction

[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0020] see figure 1 , the present invention comprises a high-pressure steam pipe and a low-pressure steam pipe; the entrance of the high-pressure steam pipe is provided with a high-pressure steam pipe inlet valve 3 or a four-stage extraction to control the high-pressure cylinder exhaust or four-stage steam extraction to enter the high-pressure steam pipe respectively. High-pressure steam pipe inlet valve 4; the entrance of low-pressure steam pipe is provided with four-stage steam extraction or five-stage steam extraction to enter low-pressure steam pipe respectively. Inlet valve 6;

[0021] The outlets of the high-pressure steam pipe and the low-pressure steam pipe are respectively connected to the high-pressure inlet and the low-pressure inlet of the small-flow ejector 1 and the large-flow ejector 2 with a parallel compression ratio of 1.2 to 1.8 and an out...

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Abstract

Provided is a full-load auxiliary steam system of a thermal power unit. A valve controlling a high-pressure steam source to enter a high-pressure steam pipe is arranged on the high-pressure steam pipe, a valve controlling low-pressure injected steam is arranged on a low-pressure steam pipe, the high-pressure steam pipe is connected with a small flow ejector and a large flow ejector, and the low-pressure steam pipe is connected with the small flow ejector and the large flow ejector, wherein the small flow ejector and the large flow ejector are connected in parallel, and the outlet of the small flow ejector and the outlet of the large flow ejector are connected with an auxiliary steam master pipe. The full-load auxiliary steam system of the thermal power unit avoids the irreversible losses of steam extraction throttling caused by the switching of the auxiliary steam among different steam sources due to the frequent change of load in the actual running process of the thermal power unit, and thus improves the thermal efficiency of the thermal power unit. The full-load auxiliary steam system of the thermal power unit can be used for the design of newly-built units, can also be used for the transformation of existing units, and has wide application prospects.

Description

technical field [0001] The invention relates to a factory steam system, in particular to a full load factory steam system of a thermal power unit. Background technique [0002] The factory steam system provides users with factory steam with relatively stable parameters, and is an important auxiliary system for large coal-fired power generating units. In order to ensure the stable and safe operation of the unit, the pressure and temperature of the factory steam should meet the requirements. When the load of the unit changes, the extraction pressure of each section will also change, so it is necessary to adjust and switch the plant steam source. Since the extraction steam pressure is generally higher than the plant steam system pressure, the extraction steam can only enter the plant steam system after throttling. For example, for a 660MW supercritical unit, the designed plant steam source is four-stage extraction, which is the same extraction stage as the deaerator; but when...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F17D1/06
Inventor 李千军李涛邢秦安刘继平
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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