A steam cooling heater and its working method

Abstract

The invention discloses a steam cooling heater and a working method thereof. The steam cooling heater comprises a steam cooler and a heater, wherein U tubes of the steam cooler and the heater are connected together by communicating pipelines, and after entering the steam cooler, exhausted steam of a turbine firstly heats a medium in the first U tube, meanwhile, the exhausted steam is cooled, and the cooled exhausted steam enters the heater via the communicating pipelines to heat a medium in the second U tube, thus realizing the function of an original heater. According to the invention, the function of the steam cooler can be realized, and a heater can be replaced, thus having dual functions; the steam cooler and the heater are integrated into one, thus greatly reducing occupation area; and independent arrangement of an emergency drain pipeline of the steam cooler is not needed, thus simplifying pipeline layout and greatly lowering modification cost.

Description

technical field [0001] The invention belongs to the field of steam extraction and heater system optimization of a thermal power generating set, and in particular relates to a steam cooling heater and a working method thereof. Background technique [0002] Due to the high degree of superheat of the reheating extraction steam of the reheating unit of the thermal power plant, the irreversible loss generated during the heat exchange process is also very large. In order to reduce this loss as much as possible, the existing modification method is to add an external steam cooler to the corresponding steam extraction pipe of the unit. The steam cooler is located on the steam extraction pipe, and part of the feed water enters the boiler after being heated by the steam cooler. The extracted steam enters the inside of the heater after being cooled down. On the one hand, this method appropriately increases the temperature of part of the feed water, reduces the effective heat transfer t...

AI Technical Summary

Problems solved by technology

[0003] Existing retrofit technology, that is, adding an external steam cooler to the steam extraction pipeline, not only requires the purchase of a separate steam cooler, but also due to changes in the inlet steam parameters, the original high-pressure heater does not meet the requirements and needs to be replaced

At the same time, the difficulty of piping layout increases, mainly because the emergency drain piping of the steam cooler needs to be re-arranged

The complexity of the system is greatly increased, and the estimated cost is more than 10 million

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