Circulating water direct connection waste heat supply and steam extraction heat supply coupled combined heat and power generation heat supply system

Abstract

The invention discloses a circulating water direct connection waste heat supply and steam extraction heat supply coupled combined heat and power generation heat supply system in the technical field of pyroelectricity design and control. The system comprises a steam turbine intermediate pressure cylinder, a communicating pipe valve, a steam turbine low pressure cylinder, a cooling tower / air cooling island, a condenser, a heat supply steam extraction valve, a heating network heater, a near-end heating network and a far-end heating network, wherein an outlet of the steam turbine intermediate pressure cylinder is respectively communicated with an inlet of the steam turbine low pressure cylinder and an inlet of the heating network heater through the communicating pipe valve and the heat supply steam extraction valve; an outlet of the steam turbine low pressure cylinder is connected with an inlet of the condenser; an outlet of the condenser is respectively connected with an inlet of the cooling tower / air cooling island, an inlet of the near-end heating network and the inlet of the heating network heater; an outlet of the heating network heater is connected with an inlet of the far-end heating network; an outlet of the far-end heating network is merged with an outlet of the near-end heating network and then connected with the inlet of the condenser. The system reduces loss of a cold source and solves the problem that long-range transmission of circulating water direct connection waste heat supply cannot be achieved.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric design and control, and in particular relates to a cogeneration heat supply system in which circulating water is directly connected to waste heat for heat supply and steam extraction for heat supply. Background technique [0002] It is stipulated in the "Energy Conservation Law of the People's Republic of China" that the state encourages the development of cogeneration and centralized heating systems to improve the utilization rate of thermal power units. The "National Regulations on the Development of Cogeneration of Heat and Power" also pointed out that cogeneration of heat and power has comprehensive benefits such as energy saving, environmental protection, improvement of heating quality, and increase of power supply. Important measures are an important part of central heating and a public welfare infrastructure to improve people's quality of life. However, the central heating system in...

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Problems solved by technology

If the steam extraction parameters are too high, it will inevitably lead to the reduction of steam turbine power and the waste of energy grade

[0004] 2. The exhaust steam of the low-pressure cylinder is discharged into the condenser, and the steam condenses to release the latent heat of vaporization. Although the energy grade is low, the exhaust steam volume is large, which brings a lot of cold source loss

At present, there is no reasonable and effective way to utilize this waste heat

[0005] 3. The direct connection of circulating water to waste heat can greatly reduce the loss of cold source, but the direct supply of circulating water, due to the small temperature difference heating, the layout of the pipe network is difficult and the energy consumption of long-distance transmission is significantly increased, so the economy cannot be guaranteed

[0006] 4. The low-grade heating theory and implementation technology are becoming more and more perfect. Floor heating with a designed supply and return water temperature of 50 / 40°C and fan coil technology with a lower required temperature level have gradually replaced traditional radiators for new construction. In buildings, the most reasonable heating mode applicable to this type of radiator is the power plant circulating water direct connection waste heat heating mode, but the current circulating water direct supply mode applicable to 300MW and 600MW large thermal power units is still blank

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