Method for producing active pulverized lime by utilizing coal gas to calcine limestone through suspended state pre-heating decomposing furnace

Abstract

The invention relates to a method for producing active pulverized lime by utilizing coal gas to calcine limestone through a suspended state pre-heating decomposing furnace, which belongs to the field of environment protection production of building materials. The method comprises the voltage stabilizing and conveying process of coal gas, the combustion heating process of the coal gas in a decomposing furnace for sufficiently combusting the coal gas in the suspended state pre-heating decomposing furnace to obtain the active quicklime powder as staflux in the lime calcining production, and the process for cooling the lime by a grate type cooler. Coke-oven coal gas, blast furnace coal gas, converter coal gas and mixed coal gas in the metallurgy production process are respectively adopted as fuel for replacing the coal powder in the traditional process for calcining and decomposing the lime powder. The method solves the problem of environment pollution caused by coal firing, improves the utilization rate of the excessive coal gas generated during steel making, reduces the outwards discharge of the coal gas, simultaneously improves the production efficiency and the heat efficiency of the lime calcination, and improves the activity of the lime.

Description

technical field [0001] The invention relates to a method for producing active quicklime by using surplus gas in iron and steel production as fuel and calcining limestone in a suspended precalcining furnace for producing cement, which belongs to the field of environmental protection production of building materials. Background technique [0002] At present, the technology of limestone calcination to produce active lime powder in my country is mainly rotary kiln and shaft kiln: as a mature calcination process, rotary kiln is widely used in quicklime production, but the initial investment is large, and the quality of operators, maintenance personnel and technicians is greatly affected. High requirements, strict requirements on the quality and particle size of raw materials and fuels, and high power consumption, resulting in high production costs of quicklime; shaft kiln is the most traditional process in calcining limestone, but its disadvantages are: 1. Limestone Heating and dec...

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Problems solved by technology

[0002] At present, the technology of limestone calcination to produce active lime powder in my country is mainly rotary kiln and shaft kiln: as a mature calcination process, rotary kiln is widely used in quicklime production, but the initial investment is large, and the quality of operators, maintenance personnel and technicians is greatly affected. High requirements, strict requirements on the quality and particle size of raw materials and fuels, and high power consumption, resulting in high production costs of quicklime; shaft kiln is the most traditional process in calcining limestone, but its disadvantages are: 1. Limestone Heating and decomposing under block, slow heat transfer and mass transfer, long heating and decomposition time, low production efficiency; 2. High production temperature, long holding time, low thermal efficiency and high heat consumption; 3. The generated SO 2 4. The incomplete combustion of fuel is serious, resulting in a large amount of CO, resulting in waste of fuel; 5. The formation temperature is high, the structure of quicklime is tight, the activity is poor, and the quality stability is poor

[0003] In the metallurgical process, a large amount of gas is produced, including coke oven gas, blast furnace gas, and converter gas. Most of them are used to heat various furnaces (kilns) and boilers in the metallurgical process. With the continuous expansion and the advancement of energy-saving technology, most steel mills have the problem of surplus gas. Due to the constraints of the regional environment, many enterprises have no better use of surplus gas, so they all release it. This wastes energy and causes environmental damage. Pollution

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