Specific analysis of waste heat power generation

The important equipment of waste heat power generation is waste heat boiler, also known as waste heat boiler. It uses the heat or combustible substance in the working medium such as waste gas and waste liquid as a heat source to heat the working medium and generate steam. If only waste heat is used, no incineration equipment is required; If combustible materials are used, special incineration equipment is required. Waste heat boiler design.

The heating surface is usually arranged reasonably according to the characteristics of the working medium and process and the characteristics of the exhaust gas (including flow rate, temperature, composition, ash content, pressure and other parameters). Flow rate and temperature are the primary criteria for determining boiler capacity. Due to the wide variety of waste heat, the structure of waste heat boiler also has a variety of types, and is very different from the general boiler.

And because the temperature of the working medium is not high, the waste heat boiler is large and the metal consumption is large. For high-pressure discharge working medium, the boiler structure also contains a flue and a smoke chamber that can withstand the corresponding pressure. In order to adapt to the characteristics of various discharge working medium, the waste heat boiler often adopts the natural circulation mode. There are also auxiliary cycle drum boilers and direct current boilers.

The waste heat used for power generation mainly includes high-temperature flue gas waste heat, chemical reaction waste heat, waste gas, waste liquid, low-temperature waste heat, residual pressure difference of working medium, etc. The use of a lot of high temperature flue gas, gas, etc. in factory production to generate electricity. For example, in the rotary kiln used for roasting cement clinker in a cement factory, high temperature flue gas of about 900 ° C is discharged from the chimney.