Centrifugal type fusion slag quenching and dry type granulating, and waste heat recovery power generation system and method

Abstract

The invention provides a centrifugal type fusion slag quenching and dry type granulating system and method and a waste heat recovery power generation system and method, belongs to steel metallurgy slag treatment and waste heat recovery technology fields. The system of the invention comprises a slag receiving device, a slag centrifugal type quenching and granulating device, a slag slow cooling device, a waste heat recovery power generation device and an exhaust gas purifying and treating device. The system quenches and granulates the fused slag by the special centrifugal type quenching and granulating device, and rapidly cools the slag into a viterous body state. Then the slag is further slowly cooled by a water-cooled type vibration grate, and the waste heat recovered in the quenching andslow cooling processes generates steam by a binary channel type exhaust-heat boiler, which drives a turbo generator set for power generation. The system and the method effectively resolves the problem of long-time, safety and stabilization operation of a centrifugal type granulation device, and implements fused slag quenching and dry type granulation, and on the basis of non-influence on followedutilization value, the system and the method can high-efficiency and fully recover the high temperature waste heat resource of the slag.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgical slag treatment and residual energy recovery, and in particular relates to a centrifugal melting slag quenching dry granulation and waste heat recovery power generation system and a method thereof. Background technique [0002] According to the data, the energy consumption of China's iron and steel industry accounts for 10-15% of the country's total energy consumption. A large amount of slag will be produced in the production of iron and steel, and 0.3-0.6 tons of blast furnace slag will be produced for every ton of pig iron produced. 0.13 tons of steel slag should be produced as a by-product of steel products. The above-mentioned molten slag has an initial temperature as high as 1400-1600°C and is rich in a large amount of sensible heat resources. If it is not utilized or directly quenched with water, it will seriously waste energy and pollute the ecological environment. [0...

AI Technical Summary

Problems solved by technology

The main defects of the water quenching method are: (1) a large amount of fresh water is consumed, wasting water resources; (2) the sensible heat of slag is not recovered, and waste heat resources are seriously wasted; (3) air pollution (SO 2 , H 2 S and other gaseous sulfides); (4) The system maintenance workload is large; (5) During grinding, the slag must be dried, which still consumes energy

At present, the centrifugal granulation method has a good effect on the granulation of molten slag, but it is not ideal in terms of the quenching effect and the thermal efficiency of slag waste heat recovery.

Moreover, under long-term high-temperature conditions, the transmission and lubrication problems of the centrifugal granulation device have not been well resolved

[0006] At present, the waste heat of molten slag is the only high-temperature waste heat resource that has not been effectively utilized in iron and steel enterprises

Images