An Organic Rankine Cycle Waste Heat Power Generation System Based on Falling Film Evaporator

Abstract

The invention relates to an organic Rankine cycle waste heat power-generating system based on a falling-film evaporator. The organic Rankine cycle waste heat power-generating system comprises a heat exchange device which consists of the falling-film evaporator, a gas-liquid separator, a screw expander, a power generator, a heat regenerator, a pre-heater, a steam condenser, a cooling tower, a cooling water pump, a condensing pump, a liquid storage tank, a working medium pressurizing pump, a working medium circulating pump, a first fan, a second fan, a dust remover, a chimney and a flash evaporator, a cooling device, a power-generating device and a dust-removal device. Heat exchange efficiency of an organic working medium in the falling-film evaporator of the system is high, waste heat energy resources are sufficiently utilized, and waste heat energy resources in the pre-heater are reutilized, so that a waste heat recovery rate of the system is increased; the organic working medium in the heat generator sufficiently utilizes waste heat of exhaust gas of the screw expander to heat, so that circulating efficiency of the system is improved; and the fall-film evaporator and the heat generator are combined, so that the system has the advantages of being high in waste heat recovery rate, high in thermoelectric conversion efficiency, convenient to mount and the like.

Description

technical field [0001] The invention belongs to the technical field of waste heat utilization, in particular to an organic Rankine cycle waste heat power generation system based on a falling film evaporator. Background technique [0002] my country is rich in available waste heat resources, especially in metallurgy, building materials, chemical industry, machinery, light industry and other industries, which account for about 17% to 67% of the total fuel consumption, of which the recovery rate of waste heat resources reaches 60%. For example, a large amount of fuel is consumed in the production process of industrial kilns, the thermal efficiency is only about 30%, and the waste heat taken away by high-temperature flue gas and slag is as high as 40%~60%. About 36% of the furnace sensible heat expenditure. Waste heat energy is divided into three categories: high temperature, medium temperature, and low temperature. Among them, the temperature above 650°C is high temperature, t...

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Problems solved by technology

The existing power generation system has the following disadvantages: first, the system efficiency is low, there is no heat recovery device, the heat source cannot be fully utilized, and the energy utilization rate is low; second, the recovery rate of waste heat is low, and the heat exchange efficiency of ordinary heat exchangers is not high , leading to low overall waste heat recovery rate and low thermal energy utilization rate of the system

However, this method is prone to turbulence and bubbles, which affects the uniformity of the liquid film thickness. The heat exchange efficiency of the falling film evaporation tube is low and the operating cost is high.

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