High-back pressure combined heat and power generation system coupled with exhaust steam and supply heat of non-reheat steam turbine

Abstract

The invention belongs to the technical field of thermoelectricity, and relates to a high back pressure heat and power cogeneration system coupled with exhaust steam heat supply of a non-reheat steam turbine. A non-reheat medium-pressure steam turbine and generator II are added to the power generation system, and the heating system mainly includes a high backpressure heating condenser, a non-reheat medium-pressure steam turbine, a heat network heater, a remote heat network and a short-range heat network. The exhaust steam from the low-pressure cylinder of the main steam turbine enters the heating condenser to condense and release heat. The circulating water in the condenser absorbs heat and enters the short-distance heating network or heating network heater. The exhaust steam from the steam turbine is further heated and enters the remote heating network, and the return water from the remote and short-range heating networks is mixed and then enters the condenser. The invention utilizes the waste heat of the exhaust steam of the steam turbine to reduce the loss of the cooling source; the return water of the short-range and remote heating network is mixed, so that the temperature of the return water of the heating network entering the condenser is reduced, and the utilization efficiency of waste heat is improved. The invention is suitable for the heat supply transformation of 300MW and above large-capacity units with short-range low-temperature heat demand.

Description

technical field [0001] The invention belongs to the technical field of thermoelectricity, and in particular relates to a high back pressure combined heat and power system coupled with exhaust steam heat supply of a non-reheat steam turbine. Background technique [0002] Thermal power to improve energy conversion efficiency, realize efficient energy utilization and integrated control of pollutants is an important way to achieve energy conservation and emission reduction of fossil energy such as coal, and cogeneration of heat and power is one of the important measures. The combined heat and power unit supplies heat to the outside while generating electricity, which can effectively reduce the loss of cold sources. Using cogeneration technology, the comprehensive utilization efficiency of thermal power energy can theoretically be increased to more than 80%. [0003] Under the existing technology, the standard coal consumption of centralized heating with combined heat and power ...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a high back pressure cogeneration system coupled with exhaust heat supply of a non-reheat steam turbine to solve the complex heat supply demand mentioned in the background technology and reduce the impact of heat supply on the power generation of the unit and other issues, so that under the premise of ensuring the heating comfort of heat users, the power generation capacity is relatively high, and the deep energy saving of the combined heat and power system can be achieved.

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