One-grade large bypass reheating unit adjacent-unit heating system

Abstract

The invention relates to the technical field of heating systems, in particular to a one-grade large bypass reheating unit adjacent-unit heating system comprising a first unit, a second unit and an interconnection electric door. The first unit and the second unit are connected through a pipeline. The interconnection electric door is arranged on the pipeline connected with the first unit and the second unit. The first unit comprises a first high-pressure heater steam inlet section and a first cold section steam supply section which are connected through a pipeline. The second unit comprises a second high-pressure heater steam inlet section and a second cold section steam supply section which are connected through a pipeline. The one-grade large bypass reheating unit adjacent-unit heating system achieves adjacent-unit heating of the two units, preheating is conducted on high-pressure cylinders, and full heating is conducted on cold section pipelines and heat section pipelines which are connected with intermediate-pressure cylinders and reheaters; and in this way, the intermediate-pressure cylinders cooperate with the high-pressure cylinders to conduct impulse starting on a rotor of aturbine, the start time of the units is shortened, the energy consumption is reduced, and the operation safety of the units is guaranteed.

Description

technical field [0001] The invention relates to the technical field of electric power systems of large power plants, in particular to a heating system adjacent to a primary large bypass reheating unit. Background technique [0002] With the development of society and economy, the consumption of resources is increasing, and the damage to the environment is becoming more and more serious. In order to better respond to the country's strategic goal of efficient development of energy saving, emission reduction and consumption reduction, thermal power plants also need to save more energy during the operation of the unit. Consumption reduction improvements. A large-scale generator set in a thermal power plant uses dual units, which has problems such as long start-up time and high energy consumption for steam turbine start-up. Moreover, since the bypass system uses a first-stage high-pressure bypass system, it can only meet the start-up requirements of the unit. After the boiler is ...

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Problems solved by technology

A large-scale generator set in a thermal power plant uses dual units, which has problems such as long start-up time and high energy consumption for steam turbine start-up. Moreover, since the bypass system uses a first-level high-pressure bypass system, it can only meet the start-up requirements of the unit. After the boiler is ignited, the Before the steam turbine was running, the reheater was in the stage of dry burning without steam. Although it was within the allowable range of the reheater, it still caused great damage to the reheater. The exhaust steam flow rate of the high-pressure cylinder is low, because the reheating cold and hot section pipes are long, the temperature of the reheated steam entering the medium-pressure cylinder is relatively low, and the shaft vibration at both ends of the medium-pressure cylinder is relatively large, resulting in prolonged start-up time and increased unit start-up costs , affecting the safety of unit operation

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