A series heating network drainage system

Abstract

The invention belongs to the technical field of thermal power generation, especially relates to the technical field of combined heat and power generation and particularly relates to a novel series heating network drainage system. The novel series heating network drainage system comprises high-pressure heating network heaters. First electric isolating valves with the stopover function are additionally arranged at drainage openings of the high-pressure heating network heaters. Drainage is converged to a drainage main pipe of the high-pressure heating network heater openings through the high-pressure heating network heaters and enters low-pressure heating network heaters through an adjusting valve set. Second electric isolating valves with the stopover function are additionally arranged at drainage openings of the low-pressure heating network heaters. Drainage is converged to a drainage main pipe of the low-pressure heating network heater openings through the second electric isolating valves and enters heating network drainage pumps. The heating network heaters drainage is drained to deaerators of two units after pressurized drainage passing through a water level adjusting valve set of heating network drainage pump openings and a water volume balance adjusting valve set of the two units. By the adoption of the novel series heating network drainage system, the model selection difficulty, manufacturing difficulty and cost of the high-pressure heating network heaters, and the economic benefits of the units are improved.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, in particular to the technical field of cogeneration of heat and power, and in particular to a series heating network drainage system. Background technique [0002] Under the background of energy saving and emission reduction, all thermal power generation companies are currently carrying out comprehensive upgrades for energy saving and emission reduction, trying to reduce operating indicators such as unit power generation coal consumption and plant power consumption rate, and further improve the economic benefits of units. Therefore, in the heat supply transformation of pure condensing units in thermal power plants at present, many power plants have adopted the technical scheme of back pressure small steam turbines driving heating network circulating water pumps to save plant power consumption. In this scheme, the heating system is equipped with a high-pressure heating network he...

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Problems solved by technology

[0003] With the drainage system of the heating network heater, the steam source of the high-pressure heating network heater comes from the steam extraction of the medium and low pressure connecting pipes, and the parameters are generally high. Between MPa, the corresponding hydrophobic saturation temperature is about 160 ℃ ~ 180 ℃, which is much higher than that of conventional heating network heaters. In order to maximize the use of the heat of extraction steam, it is necessary to reduce the lower end difference of high-pressure heating network heaters as much as possible, increasing the The manufacturing difficulty and cost of high-pressure heating network heaters, and the parallel connection of high-pressure and low-pressure heating network heaters to the drain system will greatly increase the number of drain pumps, increase the complexity of the system, and increase equipment investment

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