CN102188904A - Denitration system and method for sintering flue gas without ammonia reducing agent - Google Patents
Denitration system and method for sintering flue gas without ammonia reducing agent Download PDFInfo
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- CN102188904A CN102188904A CN2011101213092A CN201110121309A CN102188904A CN 102188904 A CN102188904 A CN 102188904A CN 2011101213092 A CN2011101213092 A CN 2011101213092A CN 201110121309 A CN201110121309 A CN 201110121309A CN 102188904 A CN102188904 A CN 102188904A
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Abstract
The invention relates to a denitration system and method for sintering flue gas without using ammonia as a reducing agent. The system comprises a sintering machine, and a heater, a denitration reactor, a deduster, a blower fan, a desulfurization tower and a chimney sequentially connected with the sintering machine. The denitration reactor is arranged before the deduster; that is, the deduster is arranged between the heater and the denitration reactor. A catalyst layer is provided in the denitration reactor. The method comprises the following steps that: sintering flue gas is heated by the heater to an appropriate temperature before the deduster and is sent to the denitration reactor; NOx is removed by a catalytic reduction in the denitration reactor under the influence of a catalyst, wherein the chemical equation for the removing of NOx is 2NO +2CO =N2 + 2CO2; the reacted sintering flue gas is emitted into the atmosphere after dedusting and desulphurization. According to the invention, the ammonia reducing agent needs not to be added, the catalyst is widely available and cheap, and investment and operation cost needed is low; the reducing agent used in the invention is CO reduction ingredients in the sintering flue gas instead of ammonia, thereby avoiding many problems resulting from the utilization of an ammonia reducing agent.
Description
Technical field
The present invention relates to sinter fume oxynitrides (NOx) and reduce discharging, belong to the sintering device flue gas oxynitrides emission-reduction technology in Ferrous Metallurgy field, is a kind of sinter fume denitrating system and method without the ammonia reducing agent.
Background technology
SINTERING PRODUCTION is one of most important technique unit of modern steel production, has produced a large amount of atmosphere pollutions in process of production, as particle, NOx, SO
2, CO, PCDD/F, various heavy etc., be the first pollution rich and influential family of integrated iron and steel works, also be a NOx heavy polluter of integrated iron and steel works simultaneously because sintering NOx discharge capacity accounts for 50%～60% of full factory total emission volumn usually, and do not contain power plant for self-supply.At present, country has listed NOx in " 12 " overall control index, the denitrating flue gas of thermoelectricity industry will be like that flourish with the desulfurization of Eleventh Five-Year Plan, estimates also will propose the reduction of discharging of steel industry sintering machine NOx to explicitly call in " the 12 " middle and later periods.
At present, domestic combustion product gases denitration technology begins to use in power plant, and technical also ripe relatively, the catalytic reduction emission-reducing The Application of Technology of making reducing agent with ammonia is the most extensive.But sintering is different from power plant, and sintering device flue gas and coal-fired boiler in power plant flue gas are very different, and it is impracticable power plant's denitrating technique directly being moved on the sintering machine of steel industry.This be because: the sintering device flue gas amount is big, and the NOx mean concentration is far below the coal-fired boiler in power plant flue gas, and not only removal efficiency is low for full denitrating flue gas, and since the consumption of catalyst and ammonia reducing agent also the NOx of the unit of making to remove cost surprisingly high.
In view of this, seek a kind of sinter fume denitrating system and method and become pursuing one's goal of these those skilled in the art without the ammonia reducing agent.
Summary of the invention
Task of the present invention provides a kind of sinter fume denitrating system and method without the ammonia reducing agent, it has overcome the difficulty of above-mentioned prior art, is a kind ofly need not add ammonia reducing agent and catalyst wide material sources, cheap, investment and all relatively low sinter fume denitrating system and the method without the ammonia reducing agent of operating cost.
Technical solution of the present invention is as follows:
A kind of sinter fume denitrating system without the ammonia reducing agent comprises sintering machine, also comprises: the heater, Benitration reactor, deduster, blower fan, desulfurizing tower and the chimney that are connected successively with sintering machine;
Described Benitration reactor is connected the front of deduster, promptly settles to be connected deduster between heater and Benitration reactor;
Be provided with catalyst layer in the described Benitration reactor.
Described Benitration reactor is designed to fluid bed.
A kind of sinter fume method of denitration without the ammonia reducing agent may further comprise the steps:
(1) sinter fume is sent into Benitration reactor be heated to suitable temperature by heater before deduster after;
(2) carry out catalytic reduction reaction in the Benitration reactor under the effect of catalyst and remove NOx, the chemical equation that removes NOx is: 2NO+2CO=N
2+ 2CO
2
(3) reacted sinter fume enters atmospheric environment after dedusting, desulfurization.
The present invention makes it compared with prior art owing to adopted above technical scheme, and a kind of sinter fume denitrating system and method without the ammonia reducing agent of the present invention has the following advantages:
1, utilizes flue gas self component CO as reducing agent, need not additionally add other any reducing agents, simplified technological process and process equipment, reduced floor space, can obviously shorten the construction period.
2, with a kind of iron ore as catalyst, this iron ore need not synthesize again, reaction such as decomposition is produced, wide material sources and cheap only need simple and easy processing promptly can to use as catalyst, and need not complicated like that production and the process of conventional catalyst.
3, after this catalyst failure changes, still can be used as former iron ore and use, do not need regeneration or discarded, to compare the catalyst cost extremely low with the ammonia process catalytic reduction.
4, owing to contain NH in the ammonia process catalytic denitration flue tail gas
3, be 5～15mg/Nm
3, transportation, storage, adding of adding ammonia etc. all can be leaked, and secondary pollution is more outstanding.
5, ammonia mixes with air and meets naked light and easily cause combustion explosion, and the ammonia process catalytic denitration need be equipped with some necessary security measures, yet technology of the present invention does not need.
6, in the catalytic-reduction denitrified running of ammonia process, if catalyst failure has volatile NH
4NO
3Concentration will increase, and then there is not this risk in technology of the present invention.
7, according to the catalytic-reduction denitrified method of ammonia process, after catalyst failure changes, can not directly place, need handle, disposal cost is very high; Directly discarded environmental pollution is very big.
From above advantage, technology of the present invention is compared with the ammonia process catalytic reduction, and cost of investment and operating cost will reduce significantly, is accepted by iron and steel enterprise also easilier.
Technology of the present invention still belongs to the catalytic reduction technology, and just not re-using ammonia makes reducing agent, but utilizes the CO reduction components in the sinter fume to make reducing agent, thereby has avoided ammonia to make the problems of reducing agent.
Description of drawings
Fig. 1 is of the present invention a kind of without the sinter fume denitrating system of ammonia reducing agent and the schematic diagram of method.
Reference numeral:
1 is heater; 2 is Benitration reactor; 3 is deduster; 4 is blower fan; 5 is desulfurizing tower; 6 is chimney.
The specific embodiment
Below in conjunction with drawings and Examples the present invention is elaborated.
Referring to Fig. 1, the invention provides a kind of sinter fume denitrating system without the ammonia reducing agent, mainly form by sintering machine, heater 1, Benitration reactor 2, deduster 3, blower fan 4, desulfurizing tower 5 and chimney 6.
As shown in fig. 1, sintering machine connects heater 1, Benitration reactor 2, deduster 3, blower fan 4, desulfurizing tower 5 and chimney 6 successively by pipeline.Benitration reactor 2 is connected the front of deduster 3, promptly settles to be connected deduster 3 between heater 1 and Benitration reactor 2.In Benitration reactor 2, be provided with catalyst layer.
The present invention also provides a kind of sinter fume method of denitration without the ammonia reducing agent, and this method may further comprise the steps: (1) sinter fume is sent into Benitration reactor be heated to suitable temperature by heater before deduster after; (2) carry out catalytic reduction reaction in the Benitration reactor under the effect of catalyst and remove NOx, the chemical equation that removes NOx is: 2NO+2CO=N
2+ 2CO
2(3) reacted sinter fume enters atmospheric environment after dedusting, desulfurization.
The present invention has adopted following embodiment in actual applications:
Sinter fume is sent into Benitration reactor be heated to suitable temperature by heater before deduster after, owing to be provided with catalyst layer in the Benitration reactor, under the effect of catalyst, carry out catalytic reduction reaction and remove NOx, removal efficiency can reach 80%～90% even higher, and reacted sinter fume enters atmospheric environment after dedusting, desulfurization.
This embodiment can be energy-conservation because Benitration reactor is arranged on the front of deduster, and is big but the iron ore catalyst consumption is wanted, and therefore Benitration reactor can be designed to fluid bed, to realize online replacing catalyst.
By discovering: the CO in sinter fume self component can make NOx reduction 10%～15% by heating up under the situation of catalyst-free; Adopt a kind of iron ore to make catalyst, NOx reduction of discharging rate can reach more than 90% under 250 ℃～500 ℃ conditions, and emission reduction efficiency is close to 100% in the time of 350 ℃～550 ℃.This iron ore only need carry out simple machining can directly be used, and production and process that need not the sort of complexity of conventional catalyst, this iron ore that changes after the inefficacy still can be used as original purposes of former mineral matter and uses, and does not need regeneration or discarded, does not have any secondary pollution.
NOx content in the general sinter fume is at 250～400mg/Nm
3, the volumetric concentration of CO is 0.6%～1.2%, mass concentration is generally 10,000mg/Nm
3More than, be far longer than the required CO amount of reducing NOx, so no longer need to add any reducing agent.Taking off the NOx chemical equation is: 2NO+2CO=N
2+ 2CO
2
A kind of sinter fume denitrating system and method without the ammonia reducing agent of the present invention is to send into Benitration reactor (also can as required heater and Benitration reactor be integrated) after sinter fume is heated to suitable temperature by heater, be provided with this iron ore catalyst layer in the Benitration reactor, catalytic reduction removes NOx under the effect of catalyst.Sinter fume is the heater via heating before dedusting, sends into Benitration reactor after the heating.
In sum, the present invention a kind ofly need not add ammonia reducing agent and catalyst wide material sources, cheap, investment and relatively low sinter fume denitrating system and the method without the ammonia reducing agent of operating cost.Technology of the present invention is compared with the ammonia process catalytic reduction, and cost of investment and operating cost will reduce significantly, is accepted by iron and steel enterprise also easilier.Technology of the present invention still belongs to the catalytic reduction technology, and just not re-using ammonia makes reducing agent, but utilizes the CO reduction components in the sinter fume to make reducing agent, thereby has avoided ammonia to make the problems of reducing agent.
Certainly, those skilled in the art in the present technique field will be appreciated that, the foregoing description only is to be used for illustrating the present invention, and be not as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claim of the present invention the variation of the foregoing description, modification etc.
Claims (3)
1. the sinter fume denitrating system without the ammonia reducing agent comprises sintering machine, it is characterized in that, also comprises: the heater, Benitration reactor, deduster, blower fan, desulfurizing tower and the chimney that are connected successively with sintering machine;
Described Benitration reactor is connected the front of deduster, promptly settles to be connected deduster between heater and Benitration reactor;
Be provided with catalyst layer in the described Benitration reactor.
2. the sinter fume denitrating system without the ammonia reducing agent according to claim 1 is characterized in that described Benitration reactor is designed to fluid bed.
3. the sinter fume method of denitration without the ammonia reducing agent adopts the system as claimed in claim 1, it is characterized in that, may further comprise the steps:
(1) sinter fume is sent into Benitration reactor be heated to suitable temperature by heater before deduster after;
(2) carry out catalytic reduction reaction in the Benitration reactor under the effect of catalyst and remove NOx, the chemical equation that removes NOx is: 2NO+2CO=N
2+ 2CO
2
(3) reacted sinter fume enters atmospheric environment after dedusting, desulfurization.
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| CN2011101213092A CN102188904A (en) | 2011-05-11 | 2011-05-11 | Denitration system and method for sintering flue gas without ammonia reducing agent |
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|---|---|---|---|
| CN2011101213092A CN102188904A (en) | 2011-05-11 | 2011-05-11 | Denitration system and method for sintering flue gas without ammonia reducing agent |
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Cited By (11)
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|---|---|---|---|---|
| CN103982904A (en) * | 2014-04-28 | 2014-08-13 | 浙江巨化热电有限公司 | Novel comprehensive flue gas treatment system and method |
| CN104534491A (en) * | 2015-01-04 | 2015-04-22 | 山东大学 | Ultralow-dust rear smoke channel system of boiler |
| CN104567441A (en) * | 2014-12-19 | 2015-04-29 | 中南大学 | Method for enriching and recovering carbon dioxide in iron mine sintering smoke gas |
| CN107649002A (en) * | 2017-11-14 | 2018-02-02 | 攀钢集团攀枝花钢铁研究院有限公司 | The method of vanadic-titanomagnetite sintering fuel gas catalytic reduction denitration |
| CN108722180A (en) * | 2018-07-23 | 2018-11-02 | 唐山钢铁集团有限责任公司 | A kind of smoke catalytic denitration device and catalytic denitration method |
| CN109248562A (en) * | 2017-07-12 | 2019-01-22 | 清华大学 | The selective-catalytic-reduction denitrified method of flue gas |
| CN109945221A (en) * | 2012-06-08 | 2019-06-28 | 能量与控制解决方案股份有限公司 | The system and method in versatible furnace are injected for modified burner front and by the second fuel |
| WO2021000796A1 (en) * | 2019-07-02 | 2021-01-07 | 秦皇岛新特科技有限公司 | Flue gas treatment apparatus for treating co, dioxin, and white smoke plume |
| CN112263911A (en) * | 2020-10-30 | 2021-01-26 | 南京依涛环保科技有限公司 | Ammonia-free low-temperature denitration device and method for gas furnace |
| CN114642963A (en) * | 2020-12-17 | 2022-06-21 | 江苏新中金低碳科技股份有限公司 | Method for removing NOx from sintering flue gas by CO |
| CN117504579A (en) * | 2023-11-13 | 2024-02-06 | 中国科学院过程工程研究所 | SCR denitration system taking CO as reducing agent, application of SCR denitration system and SCR denitration method |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109945221A (en) * | 2012-06-08 | 2019-06-28 | 能量与控制解决方案股份有限公司 | The system and method in versatible furnace are injected for modified burner front and by the second fuel |
| CN103982904A (en) * | 2014-04-28 | 2014-08-13 | 浙江巨化热电有限公司 | Novel comprehensive flue gas treatment system and method |
| CN104567441A (en) * | 2014-12-19 | 2015-04-29 | 中南大学 | Method for enriching and recovering carbon dioxide in iron mine sintering smoke gas |
| CN104567441B (en) * | 2014-12-19 | 2016-11-09 | 中南大学 | The enriching and recovering method of agglomeration for iron mine carbon dioxide in flue gas |
| CN104534491A (en) * | 2015-01-04 | 2015-04-22 | 山东大学 | Ultralow-dust rear smoke channel system of boiler |
| CN109248562A (en) * | 2017-07-12 | 2019-01-22 | 清华大学 | The selective-catalytic-reduction denitrified method of flue gas |
| CN107649002A (en) * | 2017-11-14 | 2018-02-02 | 攀钢集团攀枝花钢铁研究院有限公司 | The method of vanadic-titanomagnetite sintering fuel gas catalytic reduction denitration |
| CN108722180A (en) * | 2018-07-23 | 2018-11-02 | 唐山钢铁集团有限责任公司 | A kind of smoke catalytic denitration device and catalytic denitration method |
| CN108722180B (en) * | 2018-07-23 | 2024-09-27 | 唐山钢铁集团有限责任公司 | Flue gas catalytic denitration device and catalytic denitration method |
| WO2021000796A1 (en) * | 2019-07-02 | 2021-01-07 | 秦皇岛新特科技有限公司 | Flue gas treatment apparatus for treating co, dioxin, and white smoke plume |
| CN112263911A (en) * | 2020-10-30 | 2021-01-26 | 南京依涛环保科技有限公司 | Ammonia-free low-temperature denitration device and method for gas furnace |
| CN114642963A (en) * | 2020-12-17 | 2022-06-21 | 江苏新中金低碳科技股份有限公司 | Method for removing NOx from sintering flue gas by CO |
| CN117504579A (en) * | 2023-11-13 | 2024-02-06 | 中国科学院过程工程研究所 | SCR denitration system taking CO as reducing agent, application of SCR denitration system and SCR denitration method |
| CN117504579B (en) * | 2023-11-13 | 2024-06-14 | 中国科学院过程工程研究所 | SCR denitration system taking CO as reducing agent, application of SCR denitration system and SCR denitration method |
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Application publication date: 20110921 |