Regenerative system of power station single reheating set and power station

Abstract

The invention provides a regenerative system of a power station single reheating set and a power station. The regenerative system comprises a condenser, a condensate pump, a low pressure heater, a medium pressure feed pump, a medium pressure heater, a high pressure feed pump, a high pressure heater, as well as mixing heaters, wherein the low pressure heater, the medium pressure feed pump and the high pressure heater are surface heaters; the regenerative system is provided with two mixing heater with different pressures, and one of the two mixing heaters has a deoxygenation function; and the medium pressure heater is arranged between the two mixing heaters, the medium pressure feed pump is arranged between the mixing heater with lower pressure and the medium pressure heater, and the high pressure feed pump is arranged between the mixing heater with higher pressure and the high pressure heater. The regenerative system provided by the invention can reduce the equipment manufacturing cost and simultaneously can improve the efficiency of a thermodynamic system.

Description

Technical field [0001] The invention relates to a power plant, in particular to a heat recovery system of a primary reheat unit in the power plant. Background technique [0002] In the prior art, the steam turbine generally has 7-9 stages of extraction steam, which are respectively provided to 7-9 heaters, of which there is only one hybrid heater. The hybrid heater also has a deoxygenation function, so the heater is usually called For the deaerator, the remaining heaters are usually surface heaters. Generally, the surface heater after the condensate pump is called a low pressure heater, and the surface heater after the feed water pump is called a high pressure heater. The drainage of surface-type high-pressure heaters is usually gradually drained to the next stage with lower pressure. The drainage of surface type low pressure heaters usually has the following two types: (I) Gradually self-flowing type, similar to the drainage system of high-pressure heaters, the drainage of low...

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Problems solved by technology

[0003] With the continuous development of technology, the parameters of the primary reheating unit are gradually increasing, and some shortcomings of the above-mentioned reheating system in the prior art are gradually revealed, which are mainly reflected in the following points: (1), with the main steam pressure of the unit Gradually increase, the head of the feed water pump in the system also gradually increases, so that the design pressure of the high pressure heater behind the feed water pump also gradually increases

Taking the ultra-supercritical unit as an example, the design pressure of the high-pressure heater has reached 37-39MPa, which greatly increases the initial investment of the heater equipment; It is inconvenient for the high-pressure heater to be equipped with a drainage pump system that transports the steam-side drainage to the feed water, but the steam-side drainage of the high-pressure heater flows step by step, and finally drains to the deaerator, which is relatively low in efficiency of the thermal system

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