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Process and equipment for co-operatively removing dust and dioxin

A dust and removal technology, applied in the field of flue gas purification, can solve the problems of easy condensation on the surface of the bag filter, high moisture content in the flue gas, and high equipment cost, reducing one-time investment, improving reactivity, and small investment. Effect

Active Publication Date: 2014-10-01
CISDI ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the rapid cooling method are: the equipment cost is high, and the amount of flue gas is increased after spraying water, and the water content of the flue gas is high, so it is easy to condense on the surface of the bag filter
Moreover, the quenching method can only remove dioxins in the flue gas of the four-hole exhaust, and is not suitable for the dust removal flue gas of the kennel

Method used

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  • Process and equipment for co-operatively removing dust and dioxin
  • Process and equipment for co-operatively removing dust and dioxin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] figure 1 It is a schematic structural diagram of a device for synergistically removing dust and dioxins of the present invention. As shown in the figure, a 50t electric furnace includes an electric furnace doghouse airtight cover 1 and an electric furnace body 1.1, and the electric furnace body 1.1 has four electrodes 1.2 , through electrode 1.2 discharge to smelt scrap steel, four-hole smoke exhaust smoke is discharged from the electrode hole of the fourth electrode, at this time the temperature is about 1200-1400°C, and the original particle content is 10g / Nm 3 , the average particle size is 13~35μm, and the concentration of dioxin is 2~10ng-TEQ / m 3 , The flue gas velocity is about 1.5m / s.

[0041] During the smelting process, kennel flue gas will be produced at the same time, the initial temperature is about 80°C, and the dioxin concentration in it is 2-10ng-TEQ / m 3 ; During the non-smelting period, roof hood flue gas 4 will be generated in the airtight hood 1 of t...

Embodiment 2

[0046] refer to figure 1 , the flue gas from the four-hole smoke exhaust and the flue gas from the kennel respectively pass through the channel I2 and the channel II3 to cool down under the action of the induced draft fan I9, and then they are introduced into the dust collector I8; Settling chamber 6, waste heat boiler / mechanical air cooler 7; at the dust collector Ⅰ8, the particle dust in the four-hole smoke exhaust gas and the doghouse flue gas is filtered on the surface of the filter bag of the dust collector Ⅰ8 to realize the dust in the flue gas purification; the purified flue gas passes through the catalyst powder contained in the fiber material inside the filter bag to realize the catalytic decomposition of dioxins in the four-hole flue gas and doghouse flue gas, and finally is discharged through the chimney I2; the flue gas of the roof cover Under the action of the induced draft fan II12, it enters the dust collector II11 through the channel III4, and after the dust pa...

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Abstract

The invention discloses a process and equipment for co-operatively removing dust and dioxin, and belongs to the technical field of fume purification. According to the process, four-hole exhausted fume, doghouse fume and roof hood fume in an electric furnace doghouse sealing hood are simultaneously treated in three channels, and the process particularly comprises the steps as follows: the four-hole exhausted fume and the doghouse fume converge after passing through channels I and II respectively under the action of an induced draft fan I, and are cooled and introduced to a deduster I; in the deduster I, dust particles in the four-hole exhausted fume and the doghouse fume are filtered on the surface of the filter bag of the deduster I, then are degraged via a powdery catalyst, and finally are exhausted from a chimney I; the roof hood fume enters a deduster II via a channel III under the action of an induced draft fan II, and the purified dust particles are exhausted to the atmosphere from a chimney II. The process and the equipment co-operatively remove the dust and dioxin in the electric furnace fume, and ensure that the concentration of the dioxin and the dust concentration of the particles can meet the national environmental protection standards. The equipment is simple in structure, stable and reliable in running, less in investment and low in running and maintenance costs.

Description

technical field [0001] The invention relates to the technical field of flue gas purification, in particular to a process and equipment for synergistically removing dust and dioxins. Background technique [0002] Dioxin is the most poisonous substance in the world, and its toxicity is 1000 times that of potassium cyanide. The survey shows that the annual emission of various dioxins in my country is about 10.2kg-TEQ, of which the emission from iron and steel smelting is 4.59kg-TEQ, accounting for 45% of the total, and the emission from the electric furnace process in the iron and steel industry is close to 50%. [0003] my country has promulgated the "Steel Electric Furnace, Pellet Industry Air Pollutant Emission Standard" (GB28662-2012), which has clear requirements for the emission of dioxins and particulate matter, but there is no mature and reliable dioxin purification technology in electric furnaces The machine is used in industrial applications, and there is a long way t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D17/00F23J15/02B01D46/02B01D53/86B01D53/70
CPCY02P10/25
Inventor 李黎梁广胡堃乔华林
Owner CISDI ENG CO LTD
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