Efficient and flexible heat supply and power generation system capable of achieving gradient energy recycling

Abstract

The invention discloses an efficient and flexible heat supply and power generation system capable of achieving gradient energy recycling. The efficient and flexible heat supply and power generation system comprises an intermediate-pressure cylinder, a low-pressure cylinder, a condenser, a first heat exchanger and a first heat exchange pipe, wherein steam at a steam exhaust port of the intermediate-pressure cylinder is divided into two paths, one path enters the low-pressure cylinder, the other path enters the condenser after entering the first heat exchanger for heat exchange, steam of a steam exhaust port of the low-pressure cylinder enters the condenser, the first heat exchange pipe is arranged in the condenser, heat supply return water enters the first heat exchanger after being subjected to heat exchange through the first heat exchange pipe, and heat supply water is formed after heat exchange is conducted again in the first heat exchanger. The system has the technical effects that heat supply return water is primarily heated through the first heat exchange pipe and then enters the first heat exchanger to be heated again, heat supply water is formed after two times of heating, the energy utilization rate is higher, a part of steam discharged by the intermediate-pressure cylinder is still high in temperature after passing through the first heat exchanger, and the waste heat is introduced into the condenser for preliminarily heating the heat supply return water, so that the waste heat can be deeply utilized, and energy-saving heat supply is realized.

Description

technical field [0001] The invention relates to the technical field of thermal power unit heating, in particular to an efficient and flexible heating and power generation system capable of realizing energy cascade recovery and utilization. Background technique [0002] At present, there is a large demand for heat supply in northern my country, and there is a large stock of cogeneration units. At present, the heat supply of cogeneration units mainly includes two modes: steam extraction heating and high back pressure heating. The amount of hot extraction steam needs to consider the safe operation of the low pressure cylinder. Under the "dual carbon" goal, achieving thermoelectric decoupling to meet heating demand and reduce heating costs under deep peak-shaving conditions is a technology that the industry is currently focusing on. At present, thermoelectric decoupling mainly includes low-pressure cylinder removal technology, bypass steam heating technology, electric boiler tec...

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Problems solved by technology

[0003] For this reason, the present invention provides a high-efficiency and flexible heat supply and power generation system that can realize energy cascade recovery and utilization, so as to solve the problem of low energy utilization rate in the prior art

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