Drying system using rotary kiln waste gas residual heat

Abstract

The invention relates to a drying system utilizing residual heat in exhaust gas from kiln tail of a rotary kiln. The drying system comprises a vertical air-drying heat exchanger and auxiliary equipments including an exhaust gas inlet pipe, an exhaust gas outlet pipe, a feeding lifter, a feeding belt conveyer, a cyclone separator, a centrifugal blower, a discharge belt conveyer, a warehousing lifter, a dry slag warehouse, an air inlet port for vertical air-drying heat exchanger, a dry slag outlet port, a recycled material belt conveyer, a recycled material outlet port, a material inlet pipe for vertical air-drying heat exchanger, and an air outlet port for vertical air-drying heat exchanger. The system can effectively utilize the residual heat in the exhaust gas from the kiln tail of a rotary kiln to dry the raw material slag. The circulating load of the materials to be dried is 2-3 times of the yield of finished product. The inventive system has simple processes, simple structure of equipments, high heat exchange efficiency and high economic performance. The water content in the dried slag is not more than 1 percent. The inventive system overcomes the shortcomings of the existing slag drying using rotary type drying machine including high coal consumption and power consumption and environmental pollution due to large amount of dust emission. The invention reduces greenhouse gas emission and environmental pollution sources, improves economic benefit of enterprise, and brings distinct social benefit in the energy-saving and emission reduction project.

Description

technical field [0001] The invention relates to a process system device for drying raw material slag by using the residual heat of waste gas from the tail of a cement rotary kiln in the building material industry, in particular to a drying system using the waste heat from the tail of a rotary kiln. Background technique [0002] At present, the high speed of capital construction brought by the high speed of economic development in our country and the high speed development of the cement industry brought by the demand for cement have ranked first in the world in cement production for 10 consecutive years. One of the highly polluting industries. [0003] Aiming at the new dry-process clinker production line dominated by cement production at home and abroad, the waste gas at the tail of the new dry-process rotary kiln at around 150-250°C is discharged to the atmosphere. A medium-scale 2500t / d clinker production line rotary kiln supplies Atmospheric emissions are about 6.24×10 ...

AI Technical Summary

Problems solved by technology

It has many main and auxiliary equipment, complex process system, and exhaust gas and a large amount of dust discharge are also a major pollution source to the environment.

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