Front-end double pressure heat absorbing and heat returning circulating thermal system for thermal generator set

Abstract

The invention relates to a front-end double pressure heat absorbing and heat returning circulating thermal system for a thermal generator set, which is characterized in that a boiler, a front-end turbine, a low-temperature steam-to-steam reheater, a high-temperature steam-to-steam reheater, a front-end heater, a water-to-water heat exchanger, a primary water-feeding pump, a front-end auxiliary high-pressure heater and the like form a high-pressure primary heat absorbing process; a turbine of a conventional thermal generator set, a condenser, a high-low pressure heater set, a deaerator, a secondary water-feeding pump, a condensate pump and the like form a low-pressure secondary heat absorbing process; and the front-end turbine and the conventional thermal generator set respectively drive agenerator. The parameters of the front-end turbine and the boiler which is newly designed and has high parameters and low capacity are matched, so the original turbo generator set equipment and the thermal system thereof can be continuously used, thereby increasing the generating power of the generator set, improving the circulating thermal efficiency of the generator set and reducing the generating coal consumption. Thus, the old generator set can not be discarded because of low power and low efficiency, thereby saving the resources.

Description

technical field [0001] The invention relates to thermal cycle equipment of a thermal power plant, in particular to a dual-pressure heat absorption and heat recovery cycle thermal system of a front thermal power unit. Background technique [0002] The "Eleventh Five-Year Plan" puts forward two binding goals of energy saving and emission reduction for my country's electric power industry, and speeding up the shutdown of small thermal power units has become an important measure in the work of energy saving and emission reduction. However, shutting down small thermal power units collectively, especially for some units that have not reached the design service life, shutting down itself also means a waste of resources. It will be of great significance if the small thermal power units can be technologically transformed to improve the cycle thermal efficiency of the whole unit, increase the power generation power, reduce the coal consumption of power generation, and enable them to m...

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Problems solved by technology

[0003] The present invention is aimed at the problems of low cycle thermal efficiency and high coal consumption rate of power generation in small thermal power generating units, and proposes a dual-pressure heat absorption and heat recovery cycle thermal system for front thermal power generating units. , forming two endothermic processes of high pressure and low pressure, the boiler structure is simpler, and the manufacturing cost is greatly reduced; in addition, the reheat steam pipeline is greatly simplified, which reduces the manufacturing cost and reduces the heat loss of the reheat steam pipeline during operation

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