Flue gas waste heat recovery and flue gas processing system based on organic Rankine cycle

Abstract

The invention relates to a flue gas waste heat recovery and flue gas processing system based on organic Rankine cycle. The system includes an organic Rankine cycle power generation system and a flue gas processor system. The organic Rankine cycle power generation system includes an evaporator, an expansion machine, a power generator, a condenser, a liquid storage bin, a working medium pump and an organic working medium flow control valve. The flue gas processor system includes a dust remover and a harmful gas absorbing device. According to the invention industrial after heat power generation system and the flue gas processor are combined. The industrial after heat power generation system recovers low grade after heat in industry and outputs electric energy, so that the industrial after heat utilization rate and energy utilization rate are improved. The flue gas processor processes industrial flue gas, so that pollutant discharge is reduced. The system realizes energy conservation and emission reduction and improves energy utilization rate.

Description

technical field [0001] The invention belongs to the field of medium and low temperature waste heat utilization, in particular to a flue gas waste heat recovery and flue gas treatment system based on organic Rankine cycle. Background technique [0002] The energy issue is the primary issue of social and economic development. In recent years, with the rapid economic development, my country's demand for energy has shown a trend of rapid growth. At present, my country's energy utilization still has the main problems of low utilization efficiency, poor economic benefits, and high pressure on the ecological environment, which greatly restricts the development of my country's economy. [0003] Energy conservation and emission reduction, reduction of energy consumption, and improvement of comprehensive utilization of energy are important contents of energy development strategic planning, and are the fundamental way to solve my country's energy problems, and are in a priority positi...

AI Technical Summary

Problems solved by technology

Taking the waste heat of flue gas in a power station as an example, the general exhaust gas temperature of the power station is 120°C to 140°C, and the temperature required for flue gas desulfurization is 90°C, so it is necessary to lower the temperature of the flue gas. The cooling method generally adopted by the power station is A low-temperature economizer is arranged in the tail flue of the boiler, and the feed water is heated by the flue gas. In this way, the heat exchange temperature difference is small, and a large water flow rate is required to lower the temperature of the flue gas, and the complexity of the steam turbine system increases. The steam turbine needs Redesign, it is difficult to adjust and control operation when the steam turbine changes working conditions

Other types of flue gas waste heat application technologies mainly focus on refrigeration and heating, but this technology lacks heat users, or heat users have little, discontinuous or fluctuating demand for cold and heat, while industrial flue gas is It has always existed and the amount remains unchanged, so the use of waste heat refrigeration and heating technology is a discontinuous process, resulting in the waste heat of the flue gas not being utilized or the utilization rate is not high

Images