CN102085451B - Desulfuration and dust collection method based on reverse spray type semidry method for flue gas of sintering machine - Google Patents

Desulfuration and dust collection method based on reverse spray type semidry method for flue gas of sintering machine Download PDF

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Publication number
CN102085451B
CN102085451B CN 201010593339 CN201010593339A CN102085451B CN 102085451 B CN102085451 B CN 102085451B CN 201010593339 CN201010593339 CN 201010593339 CN 201010593339 A CN201010593339 A CN 201010593339A CN 102085451 B CN102085451 B CN 102085451B
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flue gas
desulfuration
dust collection
desulfurizing tower
flue
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CN102085451A (en
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姜述玉
姚殿宝
温建
孙艳燕
李春生
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Qinhuangdao environmental Polytron Technologies Inc
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Qinhuangdao Double Wheel Environmental Protection Technology Co Ltd
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Abstract

The invention discloses a desulfuration and dust collection method based on a reverse spray type semidry method for flue gas of a sintering machine. The desulfuration and dust collection method comprises the steps of cooling, desulfuration by virtue of a desulfurizer and dust collection by virtue of a cloth bag, wherein the flue gas is reversely sprayed by a flue before the desulfurizer, and slaked lime is sprayed to the flue gas so as to perform primary desulfuration and cool the flue gas. In the desulfurizer, the flue gas is further desulfurized and cooled. Then desulfuration ash is sprayed to the flue gas through a flue at the bottom of the desulfurizer so as to perform desulfurization. The desulfurized flue gas enters an efficient bag-type dust collector for further desulfuration and dust collection of the flue gas. The desulfuration and dust collection method disclosed by the invention has the advantages of relatively low investment, high desulfuration and dust collection efficiency and the like, and is free from influence of the properties, temperature and flow of the flue gas and suitable for the flue gas desulfuration and dust collection systems of various sintering machines.

Description

The reverse atomizing semi-dry desulphurization of sintering device flue gas dust collection method
Technical field
The present invention relates to the reverse atomizing semi-dry desulphurization of a kind of sintering device flue gas dust collection method.
Background technology
Sinter fume is after the sinter mixture igniting, with the chassis operation, the dust-laden exhaust gas that in the high temperature sintering forming process, produces, the main feature of sinter fume is: (1) sintering machine year operating rate higher, reach more than 90%, smoke discharge amount is large.(2) smoke components is complicated, and has polytropy according to the variation of batching.(3) the flue-gas temperature fluctuating range is larger, and fluctuation range is at 90~150 ℃; (4) smoke moisture is larger, generally about 10%; (5) because raw materials for sintering sulfur-bearing rate relation causes discharging flue gas SO 2Concentration has greatly changed with the variation of charge ratio; (6) the sinter fume oxygen content is high, accounts for about 10%~15%; (7) contain corrosive gas.The sinter molding process of ignition of sintering process and compound, all produce a certain amount of hydrogen chloride (HCl), oxysulfide (SOx), NitrogenOxide (NOx), FluorineChange hydrogen (HF) etc.
Flue gas desulfurization technique mainly is divided into dried/semidry method and Wet Flue Gas Desulfurization Technology.Dried/Summary of Semi-dry Flue Gas Desulfurization mainly comprises spraying Rotary drying absorption technique (SDA), circulating fluid bed flue gas desulfurization technique (CFB) etc.; Wet method mainly comprises: Gypsum Wet technique, ammonia flue gas desulfurization technique, magnesia wet processing etc.
Summary of the invention
The technical issues that need to address of the present invention just are to provide the reverse atomizing semi-dry desulphurization of a kind of sintering device flue gas dust collection method, it is relatively low that it has investment, desulfurization, efficiency of dust collection height, be not subjected to the advantages such as smoke property, temperature, flow effect, be applicable to the flue gas desulfurization dust-removal system of various sintering machines.
For addressing the above problem, the present invention adopts following technical scheme:
The invention provides the reverse atomizing semi-dry desulphurization of a kind of sintering device flue gas dust collection method, described method comprises the following steps:
1), cooling;
2), desulfurizing tower desulfurization;
3), bag-type dust.
Described cooling step cools off by spraying into cooler after the nozzle atomization in flue for the flue gas from sintering machine, and flue-gas temperature is reduced to 100-120 ℃.
The flue gas of described desulfurizing tower desulfurized step after for cooling enters desulfurizing tower by flue by desulfurizing tower top, and after the desulfurizing tower desulfurization, flue gas is through the desulfurizing tower bottom, sprays into the calcium hydroxide particle after the activation in flue, with very high mass transfer rate and the SO in the flue gas 2Deng the acidic materials hybrid reaction, generate CaSO 4, CaSO 3, and CaCl 2Etc. product; These dry state product fractions are discharged from the scrapper conveyor ash discharging hole of flue bottom, and the overwhelming majority enters sack cleaner with flue gas.
Described bag-type dust step is that the high dusty gas behind the desulphurization reaction enters the sack cleaner air inlet, has set up expansion chamber on the sack cleaner makeup of the imports, plays the effect of pre-separation; Flue gas clashes into mutually with deflector in sack cleaner, and crude particle dust is fallen into ash bucket, and flue gas enters smoke stack emission by air-introduced machine after the dedusting.
The reverse atomizing semi-dry process flue gas desulphurization of the present invention dust collection method is to absorb on the domestic and international recirculating fluidized bed law technology basis a kind of new technology that is applied to the industrial furnace flue gas desulfurization and dedusting of independent development.It is relatively low that it has investment, and desulfurization, efficiency of dust collection height are not subjected to the advantages such as smoke property, temperature, flow effect, are applicable to the flue gas desulfurization dust-removal system of various sintering machines.
The reverse atomizing semi-dry process flue gas desulphurization of the present invention dust collection method utilizes into the front flue of desulfurizing tower flue gas is carried out reverse spraying and sprays into calcium hydroxide, carries out elementary desulfurization and flue gas cool-down.In desulfurizing tower, the further desulfurization cooling of flue gas.Recycling desulfurizing tower bottom flue sprays into Desulphurization to flue gas and carries out desulfurization.Flue gas after desulfurization enters high-efficient cloth-bag dust precipitator, further desulfurization, and flue gas ash removal.
The maximum characteristics and advantages of the reverse atomizing semidry method of the present invention is: can lower the temperature by the water spray flue gas, the flue-gas temperature that enters in the desulfurizing tower is controlled in the optimal reaction temperature; Add at the flue of desulfurizing tower bottom by solid material, make the gas-solid reaction bed of sweetening process not be subjected to the impact of exhaust gas volumn, stopped collapse the easily problem of bed of sintering machine semidry process desulfurizer and occurred, thereby greatly improved utilization rate and the reliability of desulphurization system.Compare with other sintering device flue gas semi-dry desulphurization technology, have desulphurization reaction time length, system run all right, desulfurization dust-removing efficiency high.
Its desulfurization reaction mechanism is as follows:
Ca(OH) 2+SO 2=CaSO 3+H 2O;
Ca(OH) 2+2HF=CaF 2+2H 2O;
Ca(OH) 2+SO 3=CaSO 4+H 2O;
Ca(OH) 2+2HCl=CaCl 2+2H 2O;
CaSO 3+1/2O 2=CaSO 4
Thereby characteristics of the present invention have:
1, the operation of desulfurization dust-removal system does not produce harmful effect to the normal production of sintering machine.
2, flue gas divides 3 sections to contact with material, and contact is abundant, and desulfuration efficiency is high.
3, do not spray Desulphurization in the desulfurizing tower, stop to change the bed that collapses that causes because of exhaust gas volumn.
4, adopt advanced automatic control system, desulfurization dust-removal system is carried out Real Time Monitoring, guarantee desulfuration efficiency, improve operant level.
The present invention is applicable to 36~450m 2Sintering machine.
The specific embodiment
Flue gas from sintering machine cools off by spraying into after the industry water nozzle atomization in flue, and the flue gas after the cooling enters desulfurizing tower by flue by desulfurizing tower top.After the desulfurizing tower desulfurization, flue gas is through the desulfurizing tower bottom, sprays into the calcium hydroxide particle after the activation in flue, with very high mass transfer rate and the SO in the flue gas 2Deng the acidic materials hybrid reaction, generate CaSO 4And CaSO 3, and CaCl 2Etc. product.These dry state product fractions are discharged from the scrapper conveyor ash discharging hole of flue bottom, and the overwhelming majority enters sack cleaner with flue gas.
High dusty gas behind the desulphurization reaction enters cloth deduster air inlet, consider the requirement of characteristic and the desulfurization and dedusting effect of sintering device flue gas, set up expansion chamber on the cloth deduster makeup of the imports, play the effect of pre-separation, further reinforcement is gathered dust in advance, and guarantees the safe operation of cloth deduster.In this settling section, flue gas clashes into mutually with deflector, and crude particle dust is fallen into ash bucket.Flue gas enters smoke stack emission by air-introduced machine after the dedusting.
It should be noted that at last: obviously, above-described embodiment only is for example of the present invention clearly is described, and is not the restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give all embodiments exhaustive.And the apparent variation of being amplified out thus or change still are among protection scope of the present invention.

Claims (2)

1. the reverse atomizing semi-dry desulphurization of sintering device flue gas dust collection method, it is characterized in that: described method comprises the following steps:
1), cooling;
2), desulfurizing tower desulfurization;
3), bag-type dust;
Described cooling step carries out elementary desulfurization and flue gas cool-down for utilizing the front flue of desulfurizing tower that flue gas is carried out reverse spraying and sprays into calcium hydroxide, and flue-gas temperature is reduced to 100-120 ℃;
Described desulfurizing tower desulfurized step enters desulfurizing tower by advancing the cigarette flue by desulfurizing tower top for the flue gas after lowering the temperature, after the desulfurizing tower desulfurization, flue gas is through the desulfurizing tower bottom, and the calcium hydroxide particle spray into activation in the underflue of desulfurizing tower after is with very high mass transfer rate and the SO in the flue gas 2Deng the acidic materials hybrid reaction, generate CaSO 4, CaSO 3, and CaCl 2Etc. product; These dry state product fractions are discharged from the scrapper conveyor ash discharging hole of desulfurizing tower underflue bottom, and the overwhelming majority enters sack cleaner with flue gas.
2. the reverse atomizing semi-dry desulphurization of sintering device flue gas as claimed in claim 1 dust collection method, it is characterized in that: described bag-type dust step is that the high dusty gas behind the desulphurization reaction enters the sack cleaner air inlet, set up expansion chamber on the sack cleaner makeup of the imports, played the effect of pre-separation; Flue gas clashes into mutually with deflector in sack cleaner, and crude particle dust is fallen into ash bucket, and flue gas enters smoke stack emission by air-introduced machine after the dedusting.
CN 201010593339 2010-12-17 2010-12-17 Desulfuration and dust collection method based on reverse spray type semidry method for flue gas of sintering machine Active CN102085451B (en)

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CN103816794A (en) * 2014-03-05 2014-05-28 青岛新天地固体废物综合处置有限公司 Stack gas treatment device through adopting semi-dry method and treatment method of device
CN110787575B (en) * 2019-10-30 2020-12-11 江苏蓝电环保股份有限公司 Smoke purification tower for recycling dust of sintering machine head of steel plant

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CN1349844A (en) * 2000-10-24 2002-05-22 浙江大学 Circular suspension type semi-dry fume purifier
CN1490072A (en) * 2003-08-26 2004-04-21 武汉凯迪电力股份有限公司 Cyclic fluidizing dry flue desurlfurizing and duct collecting process by electric bag dust collector
CN101077470A (en) * 2007-06-29 2007-11-28 山东大学 Composite humidifying process suitable for circulating fluid bed semi-drying method flue gas desulfurization
CN101628201A (en) * 2009-08-19 2010-01-20 福建龙净脱硫脱硝工程有限公司 Clearing device for smoke pollutants of glass kiln and clearing method thereof
CN101785965A (en) * 2010-03-02 2010-07-28 浙江菲达环保科技股份有限公司 Complex absorption cycle semi-dry desulfurization and denitrification integral process and device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1349844A (en) * 2000-10-24 2002-05-22 浙江大学 Circular suspension type semi-dry fume purifier
CN1490072A (en) * 2003-08-26 2004-04-21 武汉凯迪电力股份有限公司 Cyclic fluidizing dry flue desurlfurizing and duct collecting process by electric bag dust collector
CN101077470A (en) * 2007-06-29 2007-11-28 山东大学 Composite humidifying process suitable for circulating fluid bed semi-drying method flue gas desulfurization
CN101628201A (en) * 2009-08-19 2010-01-20 福建龙净脱硫脱硝工程有限公司 Clearing device for smoke pollutants of glass kiln and clearing method thereof
CN101785965A (en) * 2010-03-02 2010-07-28 浙江菲达环保科技股份有限公司 Complex absorption cycle semi-dry desulfurization and denitrification integral process and device

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