CN103463976B - Sintering, pelletizing flue gas SCR denitration take off dioxin device - Google Patents

Sintering, pelletizing flue gas SCR denitration take off dioxin device Download PDF

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CN103463976B
CN103463976B CN201310218488.0A CN201310218488A CN103463976B CN 103463976 B CN103463976 B CN 103463976B CN 201310218488 A CN201310218488 A CN 201310218488A CN 103463976 B CN103463976 B CN 103463976B
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flue gas
ammonia
sintering
pelletizing
flue
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CN103463976A (en
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陈活虎
褚善庆
倪建东
江峰
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Baowu Water Technology Co., Ltd
SHANGHAI JINTAI NEW ENERGY ENVIRONMENTAL PROTECTION Co.,Ltd.
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SHANGHAI JINTAI NEW ENERGY ENVIRONMENTAL PROTECTION TECHNOLOGY Co Ltd
Shanghai Baosteel Energy Service Co Ltd
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Priority to CN201310181567.9 priority
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Abstract

The invention discloses a kind of sintering, pelletizing flue gas SCR denitration takes off dioxin device, this device mainly comprise pending flue gas is once heated up heat-exchange device, secondary temperature elevation heater, flue gas carried out SCR denitration take off dioxin process reaction unit, be arranged on ammonia-air supplying device between heat-exchange device and SCR reaction unit, wherein the exhaust opening of SCR reaction unit is connected with the thermal medium entrance of heat-exchange device.Apparatus of the present invention have the advantage that efficiency is high, the escaping of ammonia rate is low, and can effectively alleviate dust in flue gas to the wearing and tearing of catalyst, blocking cause poisoning, effectively can solve the too low and temperature range that is that normally do not work at denitrating catalyst of sintering, pelletizing flue gas Yin Wendu and the technical bottleneck of effective denitrogenation cannot be realized, the heat of also recyclable discharge flue gas simultaneously, reduce operating cost, at utmost can reduce the cost of denitrogenation.

Description

Sintering, pelletizing flue gas SCR denitration take off dioxin device
Technical field
The present invention relates to a kind of sintering, the denitration of pelletizing flue gas takes off dioxin device, particularly relate to and a kind of adopt SCR(selective catalytic reduction) device of technical finesse sintering, nitrogen oxide (NOx) in pelletizing flue gas and dioxin (Dioxins or Furans, DXN).
Background technology
SO in sintering, pelletizing flue gas 2, the pollutant such as NOx and DXN is the primary pollution source of steel industry, built and the sintered flue gas desulfurization device built of domestic at present existing more than 200 platforms, can predict, to 31 days December in 2014, domestic will substantially realize sintering, pelletizing flue gas desulfurization task, but substantially do not take effective special device to remove at present for removing of the pollutants such as NOx and DXN.And NOx becomes the SO that continues 2atmosphere pollution main afterwards, NOx generally includes NO, NO 2, N 2o etc.NOx is one of main greenhouse gases, and its warming effect is about CO 2310 times, simultaneously NOx can also cause depletion of the ozone layer, photochemical fog etc., even can cause the multiple harm such as human respiratory system's disease.DXN is the liposoluble substance of colorless and odorless, is very easy to accumulate in vivo, so serious to harm.
Sintering, pelletizing unit NOx discharge account for the 50-60%(of steel plant's total emission volumn not containing power plant for self-supply), concentration is 150-700mg/Nm 3, be also the main source of DXN discharge, GB28662 " steel sintering, pelletizing industrial air pollution thing discharge standard " formally promulgates in 2012, on the one hand, to SO simultaneously 2, the Pollutant emission concentration such as dust keeps under strict control further, on the other hand, give clear and definite restriction index first to concentration of emissions such as NOx, DXN, in the face of new discharge standard, sintering, pelletizing plant are by transformations such as NOx, DXN of facing a new round remove.
The Treatment process of NOx and DXN in sintering, pelletizing flue gas is main based on charcoal absorption abroad, as Japan all have employed active carbon adsorption at the sintering machine of the enterprises such as Nippon Steel, JFE, Korea S of Sumitomo Metal Industries Pu item and Australian Bo Sige (BHP), SO can be removed simultaneously 2, the pollutant such as NOx and DXN, Chinese Taiyuan Iron and Steel Co. also uses activated carbon process.The method is once invested with operating cost all very high, so domestic other iron and steel enterprises that there is no adopt this technology at present, is difficult to popularize in an all-round way.
Summary of the invention
The object of the invention is to solve above-mentioned Problems existing, providing a kind of ammonia that utilizes under the effect of catalyst, optionally reacting with NOx and DXN in flue gas and produce N 2, H 2the denitrating flue gas of O and HCl takes off DXN device.
Technical scheme of the present invention is as follows:
A kind of sintering, pelletizing flue gas SCR denitration take off dioxin device, for removing nitrogen oxide in sintering, pelletizing flue gas and dioxin, being connected to the main exhauster exhaust pass of sintering, pelletizing, comprising
Swinging flue gas heat-exchange unit, it comprises the first cold-side inlet flue, the first hot junction exhaust pass and the second hot-side inlet flue, the second cold side outlet flue, and described first cold-side inlet flue is connected with the main exhauster exhaust pass of sintering, pelletizing;
SCR reactor, the arrival end of this SCR reactor is connected with the first hot junction exhaust pass of described swinging flue gas heat-exchange unit;
Pipe burner, is arranged between swinging flue gas heat-exchange unit and SCR reactor;
Ammonia sprays grid, is arranged between described swinging flue gas heat-exchange unit and SCR reactor;
Ammonia-air gas mixture generator, its outlet conduit connects the entrance that described ammonia sprays grid;
Wherein, the port of export of described SCR reactor is connected with the second hot-side inlet flue of described swinging flue gas heat-exchange unit, second cold side outlet flue of described swinging flue gas heat-exchange unit successively with smoke discharging device, described swinging flue gas heat-exchange unit, pipe burner, ammonia spray grid, SCR reactor connects successively, described SCR reactor is connected with swinging flue gas heat-exchange unit again, forms a circulating fume treatment passage.This device can not only effective smoke treatment, the heat produced can also be reclaimed, be directly used in the heating of pending flue gas in fume treatment process.
The main process that ammonia catalyzing N Ox, DXN carry out catalytic reduction reaction is:
4 NO + 4 NH 3+ O 2→4 N 2+ 6 H 2O
6 NO 2+ 8 NH 3→7 N 2+ 12 H 2O
NO+ NO 2 + 2 NH 3→2 N 2+ 3 H 2O
DXN (Dioxins or Furans) → CO 2+ H 2O+ HCl
This serial reaction is exothermic reaction, and the flue-gas temperature of therefore discharging from SCR reactor is higher.Device energy convenience and high-efficiency of the present invention remove sintering, the nitrogen oxide of pelletizing flue gas SCR and dioxin, and the cold flue gas before the heat smoke of SCR reactor discharge and reaction is carried out heat exchange in heat exchanger, not only guarantee that flue-gas temperature reaches the preference temperature of catalyst reaction, improve denitration efficiency, but also the heat of recyclable discharge flue gas, reduce operating cost.In addition, being also provided with pipe burner for heating up to flue gas secondary, to guarantee that flue-gas temperature reaches the preference temperature of catalyst reaction, improving denitration efficiency.Described pipe burner is fuel used can be coke-stove gas (COG), blast furnace gas (BFG) and natural gas etc.
Preferably, have one or more layers honeycomb fashion, flat or corrugated plate dst catalyst layer in described SCR reactor, the upper surface of described catalyst layer is provided with sound wave type soot blower or steam sootblower.So not only can guarantee that device of the present invention has higher denitration and takes off DXN efficiency, and soot blower is set can alleviates dust in flue gas to the blocking of catalyst, wearing and tearing and poisoning.In a preferred embodiment of the invention, SCR inside reactor arranges 1-3 layer catalyst.
Preferably, the flue inside that described swinging flue gas heat-exchange unit is connected with SCR reactor is provided with flue gas blender, and described flue gas blender is arranged at the rear that described ammonia sprays grid.Arrange ammonia that flue gas blender guarantees to spray into can with flue gas Homogeneous phase mixing, reduce the escaping of ammonia rate.
Preferably, described ammonia-air gas mixture generator comprises ammonia-air mixer, and an entrance of described ammonia-air mixer is connected with dilution air pipeline, and another entrance connects ammonia dashpot, ammonia evaporator, liquefied ammonia storage tank successively.In addition, the present invention can also select other any suitable ammonia-air gas mixture generator.Above-mentioned preferred embodiment is not used in restriction.
Preferably, described swinging flue gas heat-exchange unit is connected porch pipe flue being arranged a bypass flue and described chimney and connects with the main exhauster of described sintering, pelletizing.Setting like this, just can take off the operation conditions of dioxin device according to NOx, DXN concentration and flue gas SCR denitration of the present invention in discharge flue gas, the flue gas optionally making the main exhauster of sintering, pelletizing discharge takes off dioxin device without this flue gas SCR denitration, and directly from smoke stack emission.
Apparatus of the present invention are to sintering, pelletizing flue gas carries out the flow process that denitration takes off dioxin: flue gas is by sintering, flue after pelletizing main exhauster enters denitrating flue gas of the present invention and takes off DXN device, first heat up through swinging flue gas heat-exchange unit one-level, pipe burner secondary again in the flue of rear end heats up, grid is sprayed through ammonia, mix with ammonia-air Mixture that it ejects, mix through flue gas blender again, enter SCR reactor carry out denitration take off dioxin reaction, heat recovery passes to by sintering by swinging flue gas heat-exchange unit by flue gas after denitration and de-dioxin again, through smoke stack emission after the still untreated flue gas of the main exhauster discharge of pelletizing.
Compared with prior art, beneficial effect of the present invention is as follows:
Device of the present invention has the function of denitration simultaneously, de-DXN, efficiency is high, the escaping of ammonia rate is low, can be stable, effective NOx and DXN removed in flue gas, and dust in flue gas can be alleviated to the blocking of catalyst, the catalyst poisoning caused of wearing and tearing, effectively can solve sintering, pelletizing flue gas Yin Wendu too low and not in the temperature range that denitrating catalyst normally works, and the technical bottleneck of effective denitrogenation cannot be realized, the heat of also recyclable discharge flue gas simultaneously, reduce operating cost, at utmost reduce the cost of denitrogenation.
Accompanying drawing explanation
Fig. 1 is the equipment connection schematic diagram of the device of the embodiment of the present invention, number in the figure: 1 is sintering, pelletizer, and 2 is electric cleaner, 3 is main exhauster, and 4 is swinging flue gas heat-exchange unit, and 5 is pipe burner, 6 is ammonia injection grid, and 7 is flue gas blender, and 8 is SCR reactor, 9 is damper, and 10 is chimney, and 11 is ammonia-air mixer, 12 is dilution air, 13 is ammonia surge tank, and 14 is ammonia evaporator, and 15 is liquefied ammonia storage tank.
Detailed description of the invention
The invention provides a kind of sintering, pelletizing flue gas SCR denitration takes off dioxin device, this device reaches under the effect of catalyst, utilizes ammonia optionally to react with NOx and DXN in flue gas and produces N 2, H 2o and HCl thus make denitrating flue gas take off DXN.Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Embodiment
The sintering of the present embodiment, pelletizing flue gas SCR denitration to take off in dioxin device each equipment connection mode as shown in Figure 1.This device comprises swinging flue gas heat-exchange unit 4, pipe burner 5, ammonia injection grid 6, flue gas blender 7, SCR reactor 8 and ammonia-air mixer 11, swinging flue gas heat-exchange unit 4 comprises the first cold-side inlet flue, the first hot junction exhaust pass and the second hot-side inlet flue, the second cold side outlet flue, and wherein the first cold-side inlet flue is connected with the exhaust pass of the main exhauster 3 of sintering, pelletizing; The arrival end of SCR reactor 8 is connected with the first hot junction exhaust pass of swinging flue gas heat-exchange unit 4; Pipe burner 5, ammonia spray grid 6, flue gas blender 7 is successively set between swinging flue gas heat-exchange unit 4 and SCR reactor 8, are specially the flue inside being arranged on swinging flue gas heat-exchange unit 4 and being connected with SCR reactor 8; The outlet conduit of ammonia-air mixer 11 connects the entrance that ammonia sprays grid 6, and an entrance of ammonia-air mixer 11 is connected with dilution air 12 pipeline, and another entrance connects ammonia dashpot 13, ammonia evaporator 14, liquefied ammonia storage tank 15 successively; The port of export of SCR reactor 8 is connected with the second hot-side inlet flue of swinging flue gas heat-exchange unit 4, for the heat recovery of the heat smoke of discharging from SCR reactor 8 being passed to the still untreated flue gas of being discharged by the main exhauster 3 of sintering, pelletizing, second cold side outlet flue of swinging flue gas heat-exchange unit 4 is connected with smoke discharging device successively, smoke discharging device is the damper 9 and chimney 10 that connect successively herein, for by carry out denitration take off dioxin process after flue gas discharge.Wherein, swinging flue gas heat-exchange unit 4, pipe burner 5, ammonia injection grid 6, flue gas blender 7, SCR reactor 8 connect successively, and SCR reactor 8 is connected with swinging flue gas heat-exchange unit 4 again, forms a circulating fume treatment passage.Except the above-mentioned smoke discharging device exemplified, the present invention can also adopt other smoke discharging devices.
The flow process that the device of the present embodiment carries out sintering, pelletizing flue gas SCR denitration takes off dioxin is as follows:
First the flue gas of being discharged by sintering, pelletizer 1 carries out dedusting through electric cleaner 2, then enter swinging flue gas heat-exchange unit 4 through main exhauster 3 and carry out one-level intensification, enter pipe burner 5 afterwards and carry out secondary intensification, spray ammonia-air gas mixture that grid 6 sprays afterwards to mix with ammonia, and after flue gas blender 7 mixes, enter SCR reactor 8 carry out catalytic reaction; SCR reactor 8 inside arranges 1-3 layer catalyst, the optional honeycomb fashion of pattern of catalyst, flat or corrugated plate dst, and the flue gas flow rate scope in SCR reactor is chosen according to actual needs, is 4-6m/s herein; In addition, for preventing at catalyst surface dust stratification, affect reaction efficiency, be about 0.5m place at the upper surface of every layer of catalyst layer and arrange sound wave type soot blower or steam sootblower, in addition, the position of flue gas flow rate and soot blower can also adjust according to the service condition of reality, and above data are not used in restriction; SCR reactor 8 outlet is connected with swinging flue gas heat-exchange unit 4, takes off the flue gas after dioxin process after swinging flue gas heat-exchange unit 4 heat exchange, discharge through damper 9 and chimney 10 through denitration.Wherein, the fuel consumption of pipe burner 5 as foundation, during operation, according to SCR reactor 8 porch flue-gas temperature, exhaust gas volumn, NOx and DXN concentration, adjusts ammonia straying quatity and Fuel Consumption according to SCR reactor 8 entrance flue gas temperature.Wherein the generative process of the ammonia-air gas mixture of ammonia injection grid 6 ejection is: the liquefied ammonia in liquefied ammonia storage tank 15 is gasified by ammonia evaporator 14, ammonia after gasification is stored in ammonia surge tank 13, utilize the dilution wind conveying ammonia produced through dilution air 12, again after ammonia-air mixer 11 mixes, enter ammonia and spray in grid 6.
In actual production, the operation conditions of dioxin device can be taken off according to the concentration of NOx, the DXN in sintering, pelletizing main exhauster exit flue gas and flue gas SCR denitration, optionally use device of the present invention to carry out fume treatment, or the bypass flue of flue gas after main exhauster 3 directly enter chimney 10 by damper 9 and discharge.
The preferred embodiment of the present invention is only above.Preferred embodiment does not have all details of detailed descriptionthe, does not limit the detailed description of the invention that this invention is only described yet.Obviously, according to the content of this description, can make many modifications and variations.This description is chosen and is specifically described these embodiments, is to explain principle of the present invention and practical application better, thus makes one of ordinary skill in the art can utilize the present invention well.The present invention is only subject to the restriction of claims and four corner and equivalent.

Claims (3)

1. a sintering, pelletizing flue gas SCR denitration take off dioxin device, for removing nitrogen oxide in sintering, pelletizing flue gas and dioxin, be connected to the main exhauster exhaust pass of sintering, pelletizing, it is characterized in that: comprise swinging flue gas heat-exchange unit, it comprises the first cold-side inlet flue, the first hot junction exhaust pass and the second hot-side inlet flue, the second cold side outlet flue, and described first cold-side inlet flue is connected with the main exhauster exhaust pass of sintering, pelletizing;
SCR reactor, the arrival end of this SCR reactor is connected with the first hot junction exhaust pass of described swinging flue gas heat-exchange unit;
Pipe burner, is arranged between swinging flue gas heat-exchange unit and SCR reactor;
Ammonia sprays grid, is arranged between described swinging flue gas heat-exchange unit and SCR reactor;
Ammonia-air gas mixture generator, its outlet conduit connects the entrance that described ammonia sprays grid;
Wherein, the port of export of described SCR reactor is connected with the second hot-side inlet flue of described swinging flue gas heat-exchange unit, second cold side outlet flue of described swinging flue gas heat-exchange unit is connected with smoke discharging device, described swinging flue gas heat-exchange unit, pipe burner, ammonia spray grid, SCR reactor connects successively, described SCR reactor is connected with swinging flue gas heat-exchange unit again, forms a circulating fume treatment passage;
Have one or more layers honeycomb fashion, flat or corrugated plate dst catalyst layer in described SCR reactor, the upper surface of described catalyst layer is provided with sound wave type soot blower or steam sootblower;
Described swinging flue gas heat-exchange unit is connected porch pipe flue being arranged a bypass flue and chimney and connects with the main exhauster of described sintering, pelletizing.
2. sintering, pelletizing flue gas SCR denitration take off dioxin device as claimed in claim 1, it is characterized in that: the flue inside that described swinging flue gas heat-exchange unit is connected with SCR reactor is provided with flue gas blender, described flue gas blender is arranged at the rear that described ammonia sprays grid.
3. sintering, pelletizing flue gas SCR denitration take off dioxin device as claimed in claim 1, it is characterized in that: described ammonia-air gas mixture generator comprises ammonia-air mixer, an entrance of described ammonia-air mixer is connected with dilution air pipeline, and another entrance connects ammonia dashpot, ammonia evaporator, liquefied ammonia storage tank successively.
CN201310218488.0A 2013-05-16 2013-06-04 Sintering, pelletizing flue gas SCR denitration take off dioxin device Active CN103463976B (en)

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Families Citing this family (5)

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Publication number Priority date Publication date Assignee Title
CN103463976B (en) * 2013-05-16 2015-10-28 上海宝钢节能技术有限公司 Sintering, pelletizing flue gas SCR denitration take off dioxin device
CN104190253A (en) * 2014-08-25 2014-12-10 上海宝钢节能环保技术有限公司 Coke oven flue gas SCR denitration system
US10105645B2 (en) 2015-03-26 2018-10-23 Corning Incorporated Method and system for selective noncatalytic NOx reduction
CN105749738A (en) * 2016-03-18 2016-07-13 合肥晨晰环保工程有限公司 Denitration system and process of low-temperature industrial waste gas
CN107159684A (en) * 2017-06-29 2017-09-15 浙江富春江环保热电股份有限公司 Domestic garbage incineration flyash and discarded SCR catalyst coprocessing system and method

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CN201930723U (en) * 2010-05-18 2011-08-17 浙江大学 SCR (Semiconductor Control Rectifier) smoke denitration system with structure for optimizing flow field at upstream of ammonia spraying device
CN103084064A (en) * 2013-01-18 2013-05-08 广东电网公司电力科学研究院 System and method for improving operation capacity of SCR (Silicon Controlled Rectifier) denitration device in electric power plant
CN203355611U (en) * 2013-05-16 2013-12-25 上海宝钢节能技术有限公司 Device for removing NOX and dioxins in sintering and pelletizing flue gas through SCR (Selective Catalytic Reduction)

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201930723U (en) * 2010-05-18 2011-08-17 浙江大学 SCR (Semiconductor Control Rectifier) smoke denitration system with structure for optimizing flow field at upstream of ammonia spraying device
CN103084064A (en) * 2013-01-18 2013-05-08 广东电网公司电力科学研究院 System and method for improving operation capacity of SCR (Silicon Controlled Rectifier) denitration device in electric power plant
CN203355611U (en) * 2013-05-16 2013-12-25 上海宝钢节能技术有限公司 Device for removing NOX and dioxins in sintering and pelletizing flue gas through SCR (Selective Catalytic Reduction)

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