Low-energy-consumption method for reducing emission of dioxin in sintering waste gas

A dioxin emission reduction and low energy consumption technology, applied in waste heat treatment, energy industry, climate sustainability, etc., can solve the problems of inability to reduce the energy consumption of the sintering process, high operating costs, and limited flue gas volume. Effects of dioxin emission, improvement of sintering environment, and energy saving

Active Publication Date: 2013-01-30
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent only circulates a part of the flue gas with high dioxin content, but does not mention how to solve the problem of resynthesis of organic pollutants such as dioxin in the sintering pretropical zone of the recycled flue gas
[0005] Among the currently disclosed technologies for reducing dioxin emissions in the sintering process, the method of circulating flue gas with high dioxin content cannot solve the problem of re-synthesis of organic pollutants such as dioxins in the sintering pre-tropical zone, and its The amount of circulating flue gas is limited, and the non-circulating flue gas with high dioxin content needs to be de-dioxinized, which has the disadvantages of high operating costs and failure to reduce the energy consumption of the sintering process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In one station the area is 132m 2 On the sintering machine, the total number of air boxes is 16, and the hot waste gas at 100~400°C is extracted from the 5 air boxes starting from the tail of the sintering machine and mixed with the hot waste gas of part of the ring cooler after dedusting, and a certain amount of air or Oxygen, keep the oxygen content in the mixed gas at 14%, control the temperature at 100°C, and send it to the surface of the sintering machine as the sintering process gas.

[0034] The material surface area covered by the circulating exhaust gas hood accounts for 90% of the total area of ​​the sintering machine, the proportion of solid fuel in the mixture is 3.8%, and the CaO content of quicklime in the mixture is 65%.

[0035] This embodiment can reduce the total amount of dioxin emissions in the sintering process by 50-60%, the total amount of waste gas discharged by the sintering main exhaust fan by 20%-30%, and the exhaust gas discharge of the r...

Embodiment 2

[0037] In an area of ​​180m 2 On the sintering machine, the total number of bellows is 21. The 100-400°C hot exhaust gas from the 7 bellows starting from the tail of the sintering machine is extracted and mixed with the hot exhaust gas of part of the ring cooler after dust removal, and a certain amount of air or air is added. Oxygen, keep the oxygen content in the mixed gas at 18%, control the temperature at 150°C, and send it to the surface of the material layer of the sintering machine as the sintering process gas.

[0038] The material surface area covered by the circulating exhaust air hood accounts for 80% of the total area of ​​the sintering machine, the proportion of solid fuel in the mixture is 3.3%, and the CaO content of quicklime in the mixture is 75%.

[0039] This embodiment can reduce the total amount of dioxin emissions in the sintering process by 60-70%, the total amount of waste gas discharged by the sintering main exhaust fan by 30%-40%, and the exhaust gas...

Embodiment 3

[0041] In one station the area is 430m 2 On the sintering machine, the total number of bellows is 23, and the hot exhaust gas at 100~400°C is extracted from the tail of the sintering machine and counted from the 10 bellows at the head. After dust removal, it is mixed with the hot exhaust gas of part of the ring cooler, and a certain amount of air or Oxygen, keep the oxygen content in the mixed gas at 22%, control the temperature at 200°C, and send it to the surface of the material layer of the sintering machine as the sintering process gas.

[0042] The material surface area covered by the circulating exhaust gas hood accounts for 60% of the total area of ​​the sintering machine, the proportion of solid fuel in the mixture is 3.1%, and the CaO content of quicklime in the mixture is 85%.

[0043] This embodiment can reduce the total amount of dioxin emissions in the sintering process by 70-80%, the total amount of waste gas discharged by the sintering main exhaust fan by 30...

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Abstract

The invention discloses a low-energy-consumption method for reducing emission of dioxin in sintering waste gas. The low-energy-consumption method includes firstly, dividing air boxes from the machine head to the machine tail of a sintering machine into a low-dioxin containing area and a high-dioxin containing area; secondly, mixing dedusted hot waste gas at the temperature of 100-400 DEG C of the high-dioxin containing area of the sintering machine with hot waste gas at the temperature of 100-400 DEG C of a ring cooler, then adding air or oxygen in a certain quantity, keeping the oxygen content in the mixed gas higher than 14%, controlling the temperature within 100-250 DEG C, and conveying gas used for sintering to the surface of a material layer of the sintering machine; and thirdly, discharging low-temperature waste gas subjected to dedusting and desulfurizing in the low-dioxin containing area into the air from a chimney, wherein the high-dioxin containing area includes the 4th to the 10th air boxes from the machine tail to the machine head of the sintering machine, the low-dioxin containing area includes the rest air boxes and the length of the high-dioxin containing area is smaller than or equal to that of the low-dioxin containing area. By the low-energy-consumption method for reducing emission of the dioxin in the sintering waste gas, emission of the dioxin of the sintering process can be evidently reduced and waste heat in flue gas can be recovered.

Description

technical field [0001] The present invention relates to the emission reduction of dioxins in the sintering process and the recovery and utilization of waste heat of waste gas from sintering machines, in particular to a method for reducing dioxins emissions with low energy consumption in the sintering process of the iron and steel industry. Background technique [0002] Sintering is of great significance to the development of circular economy in iron and steel complexes. Sintering provides an effective way to recycle dust and other solid waste from other production units, but it is also a major energy-consuming and pollutant emitter in iron and steel complexes. One 495 m 2 When the sintering machine is in normal production, the exhaust gas emitted from the sintering main flue per hour is as high as 1.2 million Nm 3 / h above. However, sintering waste gas contains a variety of complex environmental pollutants, among which dioxin is a kind of persistent highly toxic organi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D17/00
CPCY02P80/15
Inventor 李咸伟俞勇梅崔健石洪志沙玉铎贾秀风李建熊林
Owner BAOSHAN IRON & STEEL CO LTD
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