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A vertical cooler and method using sintering flue gas to exchange heat with sintering ore

A technology for sintering flue gas and sintering ore, which is applied in the fields of flue gas purification, waste heat recovery, energy saving and emission reduction in metallurgical manufacturing, and can solve the problems of difficulty, frequent maintenance, poor cooling effect, etc., and achieves low operating costs, long service life, The effect of reducing the air leakage rate

Active Publication Date: 2019-10-25
钢研晟华科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the domestic cooling of sinter mainly adopts blast ring cooling or belt cooling technology, which has high failure rate, frequent and difficult maintenance, high power consumption in operation, many air leakage points, large air leakage (over 30%), and large fluctuations in thermal parameters. , poor cooling effect, high return rate and other disadvantages

Method used

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  • A vertical cooler and method using sintering flue gas to exchange heat with sintering ore
  • A vertical cooler and method using sintering flue gas to exchange heat with sintering ore
  • A vertical cooler and method using sintering flue gas to exchange heat with sintering ore

Examples

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Comparison scheme
Effect test

Embodiment 1

[0063] For a steel factory 400m 2 The belt-type sintering machine transforms the ring cooling into a vertical cooler, cools the sinter ore from 600-750°C to within 150°C by blowing sintering flue gas, recovers the sensible heat of sintering ore and desulfurizes and denitrates the sintering flue gas. The waste heat can be used to generate steam for grid connection or power generation.

[0064] Process 612.5t / h of sintered ore (converted to 450t / h of finished ore);

[0065] The flue gas volume, flue gas temperature and main flue gas components of the belt sintering machine are shown in Table 1.

[0066] Table 1 400m 2 The volume and composition of flue gas in the main flue of the burner

[0067]

[0068] In this embodiment, the east main flue is compiled as the first main flue (connected with 23 bellows on the east side), and the west main flue is compiled as the second main flue (connected with 23 bellows on the west). The flue gas of the first main flue at 145.6°C passe...

Embodiment 2

[0072] For a steel factory 182m 2 Walking sintering machine, the cooling on the original machine is transformed, and the vertical cooling method is adopted to process 343.5t / h of sintered ore (274.8t / h of finished ore)

[0073] According to the composition and content of the sintering flue gas and the temperature of the sintering flue gas, the sintering machine is divided into the front section of the sintering machine and the rear section of the sintering machine, and the flue gas with low temperature and high NOx concentration in the front section of the sintering machine is blown into the vertical cooler. As shown in Table 3, through gas-solid phase heat exchange with high-temperature sinter, the temperature of the cooled sinter is below 150°C, and it is output through the belt; the sensible heat of the sinter is recovered to obtain hot flue gas at 320-420°C, as shown in As shown in Table 4, and SO in the back section of the sintering machine 2 After the high-concentration...

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Abstract

The invention relates to a vertical cooler and method for utilizing sintering flue gas and sintered minerals to exchange heat and belongs to the technical field of flue gas purification and waste heatrecovery. The closed vertical cooler comprises a sintering flue gas unit, a cold air unit, a hot flue gas disposal unit and the like; the sintering flue gas unit comprises a main pipeline of a sintering flue gas center, an upper gas cap of the sintering flue gas center, a lower gas cap, a sintering flue gas partition pipeline and a sintering flue gas partition gas cap; the sintering flue gas andthe sintered minerals are subjected to gas-solid two-phase reverse heat exchange twice through the upper gas cap of the sintering flue gas center, the lower gas cap and an outlet of the sintering fluegas partition gas cap; cold air cools the sintered minerals twice through a sintered mineral partition feeding hopper and an annular-seam cooling chamber, the temperature of the cooled sintered minerals is lower than 150 DEG C, and hot flue gas is guided to the outside through an air guiding system. The sintering flue gas and the cold air are adopted for conducting heat exchange on the red hot sintered minerals, sensible heat of the sintered minerals and efficient recovery of waste heat of the sintering flue gas are achieved, the recovery rate reaches 80-85%, and conditions are provided for subsequent denitrification of the sintering flue gas.

Description

technical field [0001] The invention belongs to the technical field of energy saving and emission reduction in metallurgical manufacturing, in particular to a vertical cooler and a method for exchanging heat between sintering flue gas and sintered ore, and belongs to the technical field of flue gas purification and waste heat recovery. Background technique [0002] The utilization of waste heat in the sintering process can be divided into two stages: sintering and cooling. In the sintering stage, fuel combustion releases a large amount of heat energy; in the cooling stage, the sensible heat of sinter releases a large amount of medium and low temperature heat energy during the cooling process. In the traditional sintering process, these two parts of waste heat resources are discharged into the atmosphere in the form of waste gas, causing environmental pollution and waste of resources. [0003] my country's sintering process energy consumption accounts for 12% of the total en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27D15/02F27D17/00
CPCF27D15/02F27D17/004F27D17/008F27M2003/04Y02P10/25
Inventor 周和敏林万舟严定鎏齐渊洪王锋沈朋飞许海川武兵强张俊王海风高建军徐洪军
Owner 钢研晟华科技股份有限公司