Combined heat and power generation energy saving device using afterheat to supply heat and energy saving method

Abstract

The invention relates to a combined heat and power generation energy saving device using afterheat to supply heat and an energy saving method. The combined heat and power generation energy saving device comprises a steam boiler, a steam extraction condensed type steam turbine, an electric generator, a condenser, a deaerator and a cooling tower, wherein the steam extraction condensed type steam turbine is connected with the condenser by an exhaust steam cylinder, and the condenser is connected with the cooling tower to form large waterway circulation; the combined heat and power generation energy saving device also comprises a backpressure turbine, a compression heat pump and a heat exchanger, wherein a steam inlet of the backpressure turbine is connected with a steam extraction hole of the steam extraction condensed type steam turbine, an exhaust steam hole is connected with a steam inlet of the heat exchanger, the compression heat pump is drawn by the backpressure turbine and is connected with the backwater end of a hot-water pipe network, the condenser and the compression heat pump are connected with the cooling tower to form small waterway circulation, the water inlet end of the heat exchanger is connected with the water outlet end of the compression heat pump, the water outlet end is connected with the water inlet end of the hot-water pipe network, and the drainage end is connected with the deaerator. The invention is capable of reducing cold source loss, increasing comprehensive heat efficiency and electrothermal proportion and reducing unit electric-generation coal consumption.

Description

technical field [0001] The invention belongs to the field of energy technology, and relates to a device and an energy-saving method for using cogeneration waste heat to supply heat and reducing the coal consumption of generating units for power generation. Background technique [0002] According to the "World Energy Herald" report, my country's energy situation is grim. China's population accounts for 20% of the world's population, and its per capita energy resources are less than half of the world's average level. China is a country whose energy structure is dominated by coal. Since the 1950s, it has developed a centralized heating method based on combined heat and power generation and supplemented by boiler rooms to supply urban industrial and civil heating. By this century, central heating has become an important infrastructure in cities, and it has played an important role in improving energy utilization, improving urban atmospheric environment quality, promoting produc...

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Problems solved by technology

Its water consumption can reach more than 60% of the water consumption of the whole plant, resulting in a great waste of water resources

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