Energy-saving heat supply system for decreasing temperature of heating return water and recovering waste heat of thermal power plant

Abstract

The invention relates to an energy-saving heat supply system for decreasing temperature of heating return water and recovering waste heat of thermal power plant and aims to solve the problems such that waste heat of a cooling column in a power plant cannot be fully utilized, and energy for direct combustion of coal and natural gas is greatly wasted. According to the system, the waste heat of the cooling column in the power plant is recovered, return heat of a heating primary network is borrowed, and energy saving is significantly effective. An absorbing heat pump is driven to work by combustion of coal or natural gas, heat in return water of a primary network of a combined heat and power generation heating pipeline is borrowed, heating area can be effectively enlarged, and the waste heat of the cooling column in the power plant is delivered to an urban heat network place. A temperature difference between supply and return waters is 108 DEG C, along with another temperature difference generated by electric power, and overall heating temperature difference is up to 160-180 DEG C. Delivery efficiency of a pipeline network is greatly improved, great significance to continuously increasing urban energy conservation is achieved, and related cyclic energy consumption of the primary network is decreased to less than one fourth of the original consumption.

Description

technical field

[0001] The invention belongs to the field of improving energy utilization efficiency, and relates to a combined heating system based on heat pumps, combined heat and power and other heat sources, which utilizes combined heat and power to supply heat and return water, and recovers waste heat from power plant cooling. Background technique

[0002] At present, although combined heat and power generation has realized the step-by-step utilization of energy, it still belongs to the traditional heating method, with low heating efficiency and large energy waste. The waste heat emitted by power plant cooling towers is the largest and most concentrated waste heat resource in a city. It is called "urban waste heat energy island". The heat lost by the cooling tower accounts for 20%-30% of the total energy, and it needs to consume a lot of water resources, which is especially severe for the water-scarce north.

[0003] Today's conventional heating methods generally adopt...

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