Smoke waste heat utilization system

Abstract

The invention discloses a smoke waste heat utilization system, wherein two condensation heat exchangers are added between a desulfurizing tower and a CO2 catching system, so as to absorb smoke heat and lower exhaust smoke temperature; and the absorbed heat is used for condensation water heating and municipal heating respectively. Two smoke coolers are arranged between an electric precipitator and the desulfurizing tower, and the heat recovered from the smoke is used for boiler primary air heating and further condensation water heating respectively. An air heater is arranged between an air inlet and an air preheater, and the heat recovered from the smoke by the smoke coolers is used for boiler primary air heating. The smoke waste heat utilization system can facilitate energy conservation and efficiency improvement for a power plant, and is particularly important for a running power plant which is difficult to improve the back-heating efficiency through increasing a steam parameter. Through optimizing running parameters of a unit, increasing condensation water heating bypasses and raising the temperature of the boiler primary air entering the air preheater, the heat consumption of a whole heating device can be lowered, the pollutant emission is reduced, and the energy utilization is improved.

Description

technical field [0001] The invention belongs to the field of energy saving and emission reduction, and in particular relates to a flue gas waste heat utilization system. Background technique [0002] my country's energy reserves are insufficient, but the demand is very strong. With the rapid economic development, China has now become the second largest energy consumption country in the world. The continuous increase of energy consumption has brought many social and environmental problems, and energy saving and consumption reduction have become imperative. Coal is the most important primary energy in my country, and coal-fired power generation plays a major role in power production. Improving power generation efficiency and reducing energy consumption are of great significance to energy conservation and emission reduction. Flue gas waste heat loss is the most important item in boiler heat loss, accounting for (4~8)% of the input heat of large and medium-sized boilers, and ab...

AI Technical Summary

Problems solved by technology

However, for power plants in operation, it is difficult to improve the efficiency of the recuperation system by increasing the steam parameters. It is the only feasible way to optimize the operating parameters of the unit by increasing the temperature of the air leaving the air preheater and adding a condensate heating bypass to reduce waste heat waste.

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