Cylinder wall residual heat recovery and heat transfer device of dry method cement rotary kiln

Abstract

The invention discloses a cylinder wall residual heat recovery method and heat transfer device of a dry method cement rotary kiln. A section or multiple sections of fixed outer cylinder walls are sleeved on the outer side of a kiln body of a cement rotary kiln; working medium inlets are arranged at two ends of the outer cylinder wall; an interval is maintained between the kiln body of the cement rotary kiln and the outer cylinder wall and a working medium flow channel and a heat transfer space are formed; the middle part of the outer cylinder wall is provided with a working medium outlet; a cold heat transfer working medium can enter the interval between two cylinder bodies from two ends of each section of outer cylinder wall; the heated working medium is discharged from the fixed outlet at the middle part of the section so as to be supplied to an external heat utilization system and the surface residual heat recovery of the cement rotary kiln is finished. According to the invention, on the basis that the structure of the existing cement rotary kiln body is not changed and the operation of the existing cement rotary kiln body is not influenced, the wasted surface heat of the cement rotary kiln is recovered, not only can the cement production comprehensive energy consumption be reduced, but also the cement kiln body can be protected from exceeding the temperature, and the service life of the cement rotary kiln body is prolonged.

Description

technical field [0001] The invention relates to a method and device for recovering and utilizing waste heat from the wall of a rotary kiln in a dry-process cement production line. An energy-saving method and device for the purpose. Background technique [0002] Half of the world's cement production comes from China. Cement manufacturing is a typical industry with high energy consumption, high material consumption and high pollution. The cement rotary kiln has to bear the weight of the production materials, refractory bricks and the kiln itself, and also bear the rotating torque at the same time, so the working conditions are very harsh. In the process of dry process cement production, the surface of the rotary kiln has a large amount of waste heat that is continuously released all the year round. However, due to the limitation of the kiln body material, the temperature of the outer surface of the cement kiln is usually not higher than 400 ° C. Therefore, an infrared camera ...

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Problems solved by technology

[0003] Due to the characteristics of continuous rotation of the cement kiln and temperature control requirements, a series of utilization problems such as waste heat recovery and sealing, low grade, etc. have been caused. Therefore, the waste heat on the surface of the cement rotary kiln has not been effectively utilized at present, and related projects have not yet been reported.

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