Thermoelectricity decoupling transformation and operation method based on heat source end and heat network comprehensive adjustment

Abstract

The invention provides a thermoelectricity decoupling transformation and operation method based on heat source end and heat network comprehensive adjustment, and the thermoelectricity decoupling is realized through transformation of a high-pressure bypass and low-pressure bypass, cylinder disengaging operation of a low-pressure cylinder, additional arrangement of an electric boiler and pipe network heat storage of a heat network. In order to ensure the heat supply capacity of a unit under the low load, the cylinder disengaging operation transformation of the low-pressure cylinder is carried out on the basis of an original steam extraction and heat supply mode to increase the heat supply capacity of the unit; meanwhile, by means of joint adjustment of an initial station and a secondary station, the defect that the heat supply capacity is insufficient under the low load is overcome through the heat storage of a primary pipe network under the high load; by means of the cylinder disengaging operation of the low-pressure cylinder and the heat storage of the primary pipe network, the problem that the heat supply amount under the low load is low during the whole heat supply period can be solved basically; the electric boiler is adopted during transformation so that the electric boiler can be used as the peak adjustment of the heat load when the heat storage function fails because of an extreme weather period and a long-time pipe network operation of the unit under the low load; and meanwhile, the high-pressure bypass and the low-pressure bypass are transformed to serve as a standby means for heat supply, so that the reliability of heat supply under the low load of the unit is further improved.

Description

technical field [0001] The invention belongs to the application field of thermal power generating sets, and in particular relates to a heat supply system in the flexible transformation of thermal power generating sets, and is a thermoelectric decoupling transformation and operation method based on comprehensive regulation of heat source end and heating network. Background technique [0002] Entering the 13th Five-Year Plan, as the country and the international community pay more and more attention to environmental protection, the flexibility transformation of thermal power generation units and thermoelectric decoupling are very urgent. The reasons for the flexibility transformation of thermal power units are as follows: [0003] The need to meet carbon emission standards: China's carbon emissions account for 20% of the world's total. On September 3, 2016, China submitted the "Paris Agreement" approval document to the United Nations. China's carbon dioxide emissions will pe...

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-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

[0015] 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℃ Pressure heat supply, poor operating economy of the reformed unit

[0016] 4. Electric Boiler: In the case of disadvantages, flexible transformation requires a larger power electric boiler, which has a higher cost and is not energy-saving compared to steam extraction and heating by a steam turbine.

Images