A modification method of thermoelectric decoupling system for steam turbine low-pressure cylinder high-vacuum de-cylinder operation

Abstract

The invention provides a turbine low-pressure cylinder approximately-vacuum off-cylinder running thermoelectricity decoupling technology, and provides system configuration and a transformation running method. The system configuration comprises a turbine high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a medium-pressure cylinder and low-pressure cylinder linkage and adjusting butterfly valve, a low-pressure cylinder steam inlet isolation valve, a water ring vacuum pump, a low-pressure cylinder attemperation water adjusting valve, a low-pressure cylinder in-cylinder water spraying desuperheater, a front-mounted vacuumizing device and valves and pipes for connecting the above equipment. According to the system configuration, the low-pressure cylinder steam inlet isolation valve is additionally arranged, through low-pressure cylinder in-cylinder water spraying desuperheating transformation and vacuumizing system transformation, the problem of insufficient heat supply amount under low electrical loads in a heat supply period can be solved, and the transformation method is a new technology for thermoelectricity decoupling. The transformation method can be applied to low-pressure cylinder polish shaft heat supply transformation units, and cylinder uncovering and shaft replacement in a heating period and a non-heating period of the units ate avoided. By means of application of the technology, the unit heat supply and steam extracting capacity can be increased while thermoelectricity decoupling is achieved, safety is considered, the transformation amount of a turbine is small while thermoelectricity decoupling is achieved, and implementation is easy.

Description

technical field [0001] The invention relates to the application field of thermal power generating sets, in particular to a reforming method for thermoelectric decoupling transformation or increasing heat supply capacity of thermal power generating sets. Background technique [0002] Coal-fired thermal power generation will be an important part of my country's energy system now and for a long period of time in the future. In recent years, under the encouragement of national energy conservation and emission reduction policies and the increasing pressure of environmental protection, my country's coal power energy conservation and emission reduction work has achieved remarkable results. 5.6% of the national total; sulfur dioxide emissions accounted for 31.1% of the national total emissions; nitrogen oxide emissions accounted for 31.6% of the national total emissions. With the slowdown in the growth of electricity demand in the whole society and the large-scale development of ren...

AI Technical Summary

Problems solved by technology

The most common technology in sensible heat storage is the hot water heat storage system, hot water irrigation heat storage, the disadvantage is that the project cost is high, the heat storage temperature is low, and it occupies a large area, and the hot water storage tank is designed to adapt to peak and valley cycle storage. Heat will inevitably lead to heat storage loss, and a peak-to-valley cycle may lose 5% or more of the stored heat; the representative latent heat storage technology is the molten salt storage tank. The disadvantage of this technology is that it is very expensive. There is also heat storage loss in

[0013] 3. Bypass transformation: The disadvantage is that there are problems such as overheating of the reheater and changes in the thrust of the steam turbine, which affect the safety of the unit, and after the transformation is equivalent to directly using high-grade steam with a main steam parameter of 16.7MPa and 540℃ High-pressure heat supply, poor operating economy of the reformed unit

[0014] 4. Electric boiler: The disadvantage is that the cost is relatively high, and it is not energy-saving compared with steam turbine extraction and heating

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