Heat electricity combination supply method and device adopting gradient utilization of middle-low temperature waste heat

Abstract

The invention discloses a heat electricity combination supply device adopting gradient utilization of middle-low temperature waste heat. The device comprises a first class evaporator, an expansion machine, a condenser, a first storage tank, a working medium pump, a radiator, a second class evaporator, a compressor, a heat exchanger, a second storage tank and the like. According to the heat electricity combination supply method and the device adopting gradient utilization of the middle-low temperature waste heat, the middle-low temperature waste heat is divided into three classes for gradient utilization, the middle-low temperature waste heat is reduced to about 15 DEG C, the utilization temperature area of the middle-low temperature waste heat is enlarged, to greatly improve the utilization efficiency of the middle-low temperature waste heat, the utilization efficiency of the middle-low temperature waste heat is greatly improved, wherein the first class is Organic Rankine Cycle, the second class is heating radiators or underfloor heating, and the third class is electric heat pump cycle heat supplying; the middle-low temperature waste heat can be recovered, electricity generating and heat supplying are conducted at the same time, and heat electricity combination producing is achieved; and the electric heat pump is supplied power through the Organic Rankine Cycle, buying power from an electrical net is not needed, and the heat supplying cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of medium and low temperature waste heat utilization, and in particular relates to a cogeneration method and device for cascaded utilization of medium and low temperature waste heat. Background technique [0002] There are various forms of natural gas heating, such as gas boilers, gas cogeneration power plants, distributed energy systems and so on. Research has found that the largest energy loss of these gas heating methods is the exhaust heat of flue gas. The heat emitted by gas boilers through flue gas accounts for more than 20% of the total heat energy of gas, and about 30% of gas thermal power plants. Therefore, there is a huge energy-saving potential in flue gas waste heat recovery. Moreover, the flue gas after natural gas combustion contains a large amount of water vapor, and the latent heat of vaporization of the water vapor in the flue gas accounts for 10% to 11% of the high calorific value of natur...

AI Technical Summary

Problems solved by technology

However, due to the lack of more heat demand near where a large number of resources are located, and the lack of economical power generation and utilization technologies, they cannot be developed and utilized.

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