1000MW stage secondary reheating unit single-row high-pressure heater system

Abstract

The invention discloses a 1000MW stage secondary reheating unit single-row high-pressure heater system. The system comprises a plurality of high-pressure heaters which are connected in series in sequence through a water supply pipeline, and water evacuating openings of the high-pressure heaters are connected in series in sequence. The water supply pipeline, a steam bleeding pipeline and a heater water evacuating pipeline of the system are respectively in one row; compared with a two-row high pressure heaters, the system is simple, the number of pipelines is reduced, the number of valves in the pipeline system is reduced, thermotechnical measuring points are simple, control is easy to perform, running control is convenient to perform, the steam bleeding pipelines and the water supply pipelines of the high-pressure heaters are short, resistance is small, the 1000MW stage secondary reheating unit single-row high-pressure heater system is also favorable for reducing the heat rate of a steam turbine, single-side operation can not be achieved by the two-row high pressure heaters, and technically, the single-row high-pressure heaters have obvious advantages.

Description

technical field [0001] The invention relates to a heat recovery system of a thermal power unit, in particular to a single-column high-pressure heater system of a 1000MW secondary reheat unit. Background technique [0002] The high-pressure heater is the key equipment of the heat recovery system of the thermal power unit, and plays an important role in improving the thermal efficiency of the unit. At present, the 1000MW secondary reheat unit under construction adopts the configuration scheme of double-row high-pressure heaters. For the 1000MW secondary reheat unit, the high-pressure heater is increased from 3 stages to 4 stages, and 2 sets of pre-steam cooling are also installed. If double-column high-pressure heaters are used, the system is equipped with four-stage double-column 50% capacity, horizontal, and double-flow high-pressure heaters, of which No. After No. 1 high-pressure heater, such a unit has a total of 10 high-pressure heating devices in the heat recovery syste...

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Problems solved by technology

[0004] It can be seen that the current scheme of double-column high-pressure heaters with a front steam cooler to form a large bypass cannot realize unilateral operation. If any high-pressure heater fails, the two-column high-pressure heater must be considered to be cut off. At the same time, the increase in the number of high-pressure heaters has resulted in an increase in failure points, and the risk of high-pressure heater removal is relatively increased

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