System for realizing three-state switching operation of thermoelectric unit

Abstract

The invention relates to a system for realizing three-state switching operation of a thermoelectric unit. The system comprises a high-pressure bypass water spray temperature and pressure reduction pipeline, a low-pressure bypass water spray temperature and pressure reduction pipeline and a heat network heater. The high-pressure bypass water spray temperature and pressure reduction pipeline is arranged between a boiler and a high-pressure cylinder. The high-pressure bypass water spray temperature and pressure reduction pipeline and the low-pressure bypass water spray temperature and pressure reduction pipeline both comprise water spray temperature and pressure reduction devices. The heat network heater is connected with the portions, behind the water spray temperature and pressure reductiondevices, of the pipelines. Steam generated by the boiler is sent to the heat network heater through the high-pressure bypass water spray temperature and pressure reduction pipeline and the low-pressure bypass water spray temperature and pressure reduction pipeline. The heat network heater is connected with an external heating system. According to the system, the existing or newly added high-pressure bypass water spray temperature and pressure reduction system and low-pressure bypass water spray temperature and pressure reduction system are utilized, so that the reconstruction workload is small, the thermoelectric unit can be completely switched to three operation states, and the maximum depth peak regulation can be achieved.

Description

technical field [0001] The invention relates to the field of unit bypass applications, in particular to the application field of using primary and secondary bypasses to switch boilers from thermoelectric units to three states, and in particular to a system for realizing the switching operation of thermoelectric units to three states. Background technique [0002] We all know that electric energy cannot be stored, so the power plant needs to generate as much electricity as the user needs, so as not to cause energy waste. However, in the power system, the demand load of each power plant is constantly changing. In order to maintain the balance of active power and keep the system frequency stable, the power generation department needs to change the power generation of the generator to adapt to the change of power load. It's called peak shaving. [0003] In China's three northern regions, the power market capacity is abundant, gas turbines, pumped storage and other peak-adjustab...

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Problems solved by technology

[0004] In the existing technology, the heat and power cogeneration unit operates in the mode of “heating power”, and the peak regulation capacity of the heating unit in winter is only about 10% due to thermoelectric coupling.

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