CN107983154B - Parallel-connection-type double-tower desulfurization and denitrification process for sintering flue gas activated carbon - Google Patents
Parallel-connection-type double-tower desulfurization and denitrification process for sintering flue gas activated carbon Download PDFInfo
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
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- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2257/30—Sulfur compounds
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Abstract
The invention develops a parallel double-tower desulfurization method for sintering flue gas active carbonA denitration process, which is to sinter the high SO2The flue gas and the high NOx flue gas are treated separately and are desulfurized and denitrated separately in two-stage active carbon adsorption towers connected in parallel. The method for segmenting sintering flue gas is characterized in that the flue gas of each segment of the sintering machine contains NOxAnd SO2The concentration of the flue gas is different, the flue gas is divided into four parts of the head part, the middle tail part and the tail part, and the flue gas at the head part and the middle tail part of the sintering machine is converged into a desulfurizing tower for desulfurization; and the flue gas in the middle and at the tail of the sintering machine is converged into a denitration tower for denitration. SO adsorption by active carbon of desulfurizing tower2And then the activated carbon enters a regeneration tower for analysis, the regenerated activated carbon enters a denitration tower for cyclic utilization, the activated carbon after denitration enters a desulfurization tower for desulfurization, and the activated carbon is sequentially recycled in the three towers in a reciprocating mode. The process improves the denitration efficiency, greatly reduces the flue gas treatment capacity, and reduces the equipment investment and the operating cost.
Description
Technical Field
The invention relates to a desulfurization and denitrification process, in particular to a parallel type double-tower desulfurization and denitrification process for sintered flue gas activated carbon, and belongs to the technical field of comprehensive treatment of ferrous metallurgy flue gas pollutants.
Background
The sintering process is a main pollution source of smoke pollutants in the steel industry, the sintering waste gas accounts for 40 percent of the total waste gas in the steel industry, and the exhausted SOx,NOx、PM10Pollutants such as persistent organic matters and heavy metals are in the first place in the steel industry. From 1 month and 1 day of 2015, China starts to implement a new emission standard of pollutants for sintering (pelletizing) in the steel industry, and dust is regulated to be less than or equal to 50mg/Nm3，SO2≤200mg/Nm3，NOx≤300mg/Nm3Dioxin is less than or equal to 0.5ng/Nm3. The national environmental protection department of 6 months in 2017 issues a revised notice of the emission standard of the atmospheric pollutants in the steel sintering and pelletizing industry, the emission limit of the pollutants is further strict, and the limit of the particulate matters is adjusted to be 20mg/Nm3The limit of sulfur dioxide is adjusted to 50mg/Nm3The nitrogen oxide limit is adjusted to 100mg/Nm3. Therefore, the flue gas treatment in the iron ore sintering industry not only requires the comprehensive treatment of various pollutants such as SOx, NOx and the like, but also has increasingly strict emission standards.
For multi-pollutant flue gas generated by sintering, an economical and efficient treatment method is not available at present. In contrast, the activated carbon adsorption method has comprehensive removal function and SO2The method has the advantages of being recyclable, free of secondary pollution and the like, is more suitable for the characteristics of complex sintering raw materials, large in flue gas property fluctuation and various exceeding pollutants in China compared with other methods, and is widely regarded as a comprehensive treatment technology for sintering flue gas pollutants with great prospect.
Typical examples of the activated carbon purification technique include German WKV and Sumitomo, Japan J-Power (MET-Mitsui-BF) process. The application of purifying sintering flue gas by using an activated carbon method in China starts in 2010, Tai-Gai introduces the first domestic set of activated carbon flue gas treatment device from Japan, and through years of digestion and absorption, the current process is stable in operation and has a good desulfurization effect and a certain denitration effect. In recent years, the international engineering company ltd for domestic and domestic long-term smelting has also introduced an activated carbon flue gas treatment technology, and has realized the engineering on sintering machines such as the steel Zhanjiang and Anyang steel, and the practice shows that the activated carbon process has a better cost performance advantage than the traditional single combined desulfurization and denitration process (limestone-gypsum method/circulating fluidized bed + SCR).
A typical activated carbon flue gas purification process is shown in figure 1 and mainly comprises an adsorption tower for removing harmful substances and activated carbon regenerationThe analytical column of (1). The sintering flue gas after being pre-dedusted by an electric precipitator enters two-stage adsorption towers connected in series under the action of an exhaust fan, the flue gas is contacted with reverse active carbon from bottom to top, and SO is removed in a first-stage tower2And dioxins, then in a second stage column in NH3Removing NOx under the action of the catalyst; the active carbon absorbed with the pollutants enters a desorption tower through a conveying device, and the adsorbed SO is heated2And releasing the active carbon again, and returning the active carbon to the adsorption tower for cyclic utilization after regeneration.
The active carbon absorption tower mainly adopts a series double-tower structure (see figure 1), the sintering flue gas temperature is generally 130-150 ℃ when entering the active carbon first-stage adsorption tower for desulfurization, and the denitration temperature when entering the second-stage adsorption tower can be further reduced. Because the flue gas temperature is too low to the activated carbon denitration unfavorable, the activated carbon is not high as the low temperature activity of catalyst alone in addition, leads to the denitration rate to be difficult to promote. In addition, the currently used two-stage series desulfurization and denitrification activated carbon process firstly finishes SO in a first-stage tower in series connection2And (4) denitration is realized in the secondary tower. Although the activated carbon process has realized the localization, because the flue gas handling capacity is large, the problems of large investment cost and high operating cost cannot be fundamentally solved, and the further popularization and application of the activated carbon process are restricted.
Disclosure of Invention
Aiming at the problems of low denitration rate, high investment cost and high operating cost of the process for desulfurization and denitration by adopting activated carbon in sintering waste gas in the prior art, the invention provides a sintering flue gas activated carbon parallel type double-tower desulfurization and denitration process, which utilizes the emission characteristics of SOx and NOx in flue gas to increase SO content2Flue gas and high NOx flue gas are treated separately, and the treatment capacity of the flue gas is reduced and the flue gas treatment cost is reduced while high-efficiency denitration is realized, so that the competitiveness of the activated carbon process is greatly improved, and the method has important significance for comprehensive treatment of complex sintering flue gas.
In order to achieve the technical purpose, the invention provides a parallel type double-tower desulfurization and denitrification process for sintering flue gas and activated carbonContaining NOxAnd SO2The concentration of the compound is divided into a head part, a middle tail part and a tail part; head smoke NOxConcentration is less than or equal to 100mg/Nm3(ii) a Middle flue gas NOxConcentration > 100mg/Nm3And SO2≤200mg/Nm3(ii) a Middle tail flue gas SO2Concentration > 200mg/Nm3Enriched in alkali metals; tail flue gas SO2＜200mg/Nm3(ii) a The active carbon absorption tower adopts a parallel double-tower structure, the main body comprises a desulfurization tower and a denitration tower, the desulfurization tower is connected with the head part and the flue at the middle tail part of the sintering machine, and the denitration tower is connected with the flue at the middle part and the flue at the tail part of the sintering machine; a regeneration tower is arranged between the desulfurization tower and the denitration tower; the flue gas at the head and the middle tail of the sintering machine is converged into a desulfurizing tower for desulfurization; and the flue gas at the middle part and the tail part of the sintering machine is converged into a denitration tower for denitration.
Preferably, the temperature T ═ of the flue gas (140-150 ℃) of the desulfurizing tower is controlled by the aid of the desulfurizing tower, and the temperature is a multiplied by etaSO2(ii) a Wherein: etaSO2Is SO2In mg/Nm3(ii) a a is SO2The temperature decrease value at a higher unit concentration is 0.005 to 0.01.
In the preferable scheme, the flue gas temperature of the denitration tower is controlled to be 140-150 ℃.
In a preferable scheme, NH is sprayed into the denitration tower while flue gas is introduced into the denitration tower3Control of NH3The molar ratio of the nitrogen-containing organic compound to NO in the flue gas is 0.4-0.67.
According to the preferable scheme, after the activated carbon in the desulfurization tower is desulfurized, the desulfurized activated carbon enters a regeneration tower to be analyzed, the regenerated activated carbon is screened to remove activated carbon powder with the particle size of less than 2mm, the activated carbon with the particle size of more than 2mm enters a denitration tower to be denitrated, and the activated carbon in the denitration tower enters the desulfurization tower to be recycled.
The technical scheme of the invention divides the flue gas in the sintering machine according to the distribution conditions of the flue gas, the alkali metal smoke dust and the like generated in the sintering machine, and according to SO in the flue gas2The NOx concentration is different, the sintering machine is divided into head flue gas, middle tail flue gas and tail flue gas, and the head flue gas means that the NOx concentration at the head of the sintering machine is lower than 100mg/Nm3Cigarette (2)Gas, middle flue gas is from NOx concentration higher than 100mg/Nm3To SO2Up to 200mg/Nm3The middle tail flue gas refers to the tail SO of the sintering machine2The concentration is higher than 200mg/Nm3The tail flue gas refers to the tail SO of the sintering machine2Less than 200mg/Nm3The flue gas of (1). On the basis, high SO is skillfully added2The flue gas and the high NOx flue gas are separately treated, and the high SO is treated by using the denitration tower and the desulfurization tower with the parallel double-tower structure2Independently desulfurizing the flue gas and independently denitrating the high NOx flue gas; on the one hand, SO can be avoided2The negative effect on denitration is achieved, the poisoning effect of K, Na and other alkali metals on activated carbon denitration is greatly reduced, and the denitration efficiency can be further improved; high SO2Flue gas and high NOx flue gas are treated separately, so that the flue gas treatment capacity of the two desulfurization towers and the denitration tower is reduced by 50% compared with that of the traditional process, the scale of the adsorption tower and the scale of the regeneration tower can be reduced, and the equipment investment and the operation cost are greatly reduced.
In the technical scheme of the invention, before the head flue gas and the middle and tail flue gas of the sintering machine are merged into the desulfurization tower, and before the middle flue gas and the tail flue gas are merged into the denitration tower, an electric dust removal process is needed, which is common knowledge of people in the field.
In the technical scheme of the invention, as the activated carbon is continuously consumed in the circulating process, a small amount of fresh activated carbon needs to be continuously supplemented.
Compared with the prior art, the invention has the advantages that:
compared with the traditional series double-tower desulfurization and denitrification process, the parallel double-tower activated carbon denitration desulfurization flue gas comprehensive treatment process provided by the invention has the following characteristics:
firstly, directly converging flue gas with relatively low sulfur dioxide in the middle and relatively high nitrogen oxide and flue gas with relatively low sulfur dioxide content in the tail part into a denitration tower for denitration, and adjusting the temperature of the denitration flue gas to a certain extent by using high-temperature flue gas in the tail part of a machine, thereby overcoming the defect of low denitration reaction temperature caused by firstly desulfurizing and then denitrating in a series-connected double tower;
② high NOx flue gas and high SO2The flue gas is separately treated, and SO at the middle tail part is treated2The flue gas with higher concentration and rich alkali metal is discharged with NOx in sections, and on the one hand, SO can be used2The negative effect on denitration is avoided, the poisoning effect of alkali metals such as K, Na on activated carbon denitration is greatly reduced, and the denitration efficiency can be further improved;
according to SO2The concentration regulates and controls the temperature of the flue gas, meets the temperature requirement of desulfurization, and avoids the defect that the conventional activated carbon desulfurization can not process high-sulfur flue gas.
Fourthly, the high NOx smoke and the high SO2Flue gas reposition of redundant personnel is administered, avoids all flue gases both to advance the desulfurizing tower and advance the denitration tower for the flue gas handling capacity of two adsorption towers compares traditional handicraft and has reduced 50%, thereby can reduce the scale of adsorption tower and regenerator column, reduces equipment investment and working costs by a wide margin. Therefore, the new process is expected to realize economical and efficient denitration of the sintering flue gas.
The process meets the temperature requirement of catalytic denitration by regulating and controlling the temperature of the denitration flue gas, greatly reduces the flue gas treatment capacity, can greatly reduce the scale of the adsorption tower and the desorption tower, reduces the equipment investment and the operation cost, improves the denitration efficiency of the activated carbon from 30-50 percent of the traditional process to 50-80 percent on the basis of not influencing the desulfurization efficiency, and can reduce the investment cost by 30-50 percent and reduce the operation cost by 20-40 percent.
Drawings
FIG. 1 is a flow chart of a typical activated carbon sintering flue gas purification process;
FIG. 2 is a flow chart of a parallel type double-tower desulfurization and denitrification process for sintering flue gas activated carbon.
Detailed Description
The following examples are intended to further illustrate the present disclosure, but not to limit the scope of the invention as claimed.
FIG. 2 is a flow chart of a parallel type twin tower desulfurization and denitrification process using sintered flue gas activated carbon in example 1.
Example 1
The sintering machine is divided into a head part along the length direction (namely the material feeding end to the material discharging end)The middle part, the middle tail part and the tail part, and the smoke of each part contains NOxAnd SO2In different concentrations, head smoke NOxConcentration is less than or equal to 100mg/Nm3Middle flue gas NOxConcentration > 100mg/Nm3And SO2≤200mg/Nm3Middle tail flue gas SO2Concentration > 200mg/Nm3Tail flue gas SO rich in alkali metals2＜200mg/Nm3. Flue gas generated by the sintering machine is subjected to desulfurization and denitrification by adopting an activated carbon absorption tower, the activated carbon absorption tower adopts a parallel double-tower structure (as shown in figure 2), the activated carbon absorption tower main body comprises a desulfurization tower and a denitrification tower, and a regeneration tower is arranged between the desulfurization tower and the denitrification tower. In the sintering process, the flue gas at the head and the middle tail of the sintering machine is converged into a desulfurizing tower for desulfurization; wherein SO is used before desulfurization2The concentration is 1800mg/Nm3Controlling the temperature of the flue gas before entering the desulfurizing tower to be 150-0.01 multiplied by 1800-132 ℃; the flue gas of the middle part and the tail part of the sintering machine is converged into a denitration tower for denitration, and the temperature of the flue gas is controlled to 145 ℃ by the denitration tower. NH is sprayed into the denitration tower while flue gas is introduced into the denitration tower3Control of NH3The molar ratio of the catalyst to NO in the flue gas is 0.5. After the activated carbon in the desulfurization tower is desulfurized, the desulfurized activated carbon enters a regeneration tower to be analyzed, the regenerated activated carbon is screened to remove activated carbon powder with the particle size of less than 2mm, the activated carbon with the particle size of more than 2mm enters a denitration tower to be recycled, a small amount of fresh activated carbon is supplemented, the denitrified activated carbon enters the desulfurization tower to be desulfurized, and the activated carbon circulates in the three towers in a reciprocating manner.
Compared with the prior typical flue gas purification process by activated carbon sintering, the parallel-type double-tower flue gas desulfurization and denitrification process for the flue gas sintering disclosed by the invention has the advantages that on the basis of ensuring that the desulfurization efficiency is higher than 95%, the activated carbon denitrification efficiency is improved to about 65%, the investment cost can be reduced by 38%, and the operation cost can be reduced by 26%.
Claims (3)
1. A parallel-connection-type double-tower desulfurization and denitrification process for sintering flue gas activated carbon is characterized in that: flue gas generated by the sintering machine is desulfurized and denitrated by adopting parallel double towers;
the interior of the sintering machine contains N according to the smokeOxAnd SO2The concentration of the compound is divided into a head part, a middle tail part and a tail part; head smoke NOxConcentration is less than or equal to 100mg/Nm3(ii) a Middle flue gas NOxConcentration > 100mg/Nm3And SO2≤200mg/Nm3(ii) a Middle tail flue gas SO2Concentration > 200mg/Nm3Enriched in alkali metals; tail flue gas SO2＜200mg/Nm3；
The active carbon absorption tower adopts a parallel double-tower structure, the main body comprises a desulfurization tower and a denitration tower, the desulfurization tower is connected with the head part and the flue of the middle tail part of the sintering machine, and the denitration tower is connected with the flue of the middle part and the flue of the tail part of the sintering machine; a regeneration tower is arranged between the desulfurization tower and the denitration tower;
the flue gas at the head and the middle tail of the sintering machine is converged into a desulfurizing tower for desulfurization; the flue gas at the middle height and the tail part of the sintering machine is converged into a denitration tower for denitration;
the temperature T = (140 ~ 150 ℃) of the flue gas is controlled by the desulfurizing tower, and the temperature is a multiplied by eta SO2(ii) a Wherein: eta SO2Is SO2In mg/Nm3A is SO2Increasing the turndown of temperature per concentration, a =0.005 ~ 0.01.01;
the flue gas temperature of the denitration tower is controlled to be 140 ~ 150 ℃.
2. The parallel type double-tower desulfurization and denitrification process for the sintered flue gas and the activated carbon according to claim 1, characterized in that: NH is sprayed into the denitration tower while flue gas is introduced into the denitration tower3Control of NH3The molar ratio to NO in the flue gas was 0.4 ~ 0.67.67.
3. The parallel type double-tower desulfurization and denitrification process for the sintered flue gas and the activated carbon according to claim 1 or 2, characterized in that: after the activated carbon in the desulfurization tower is desulfurized, the desulfurized activated carbon enters a regeneration tower to be analyzed, the regenerated activated carbon is screened to remove activated carbon powder with the particle size of less than 2mm, the activated carbon with the particle size of more than 2mm enters a denitration tower to be denitrated, and the activated carbon in the denitration tower enters the desulfurization tower to be recycled.
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| CN108607346A (en) * | 2018-05-21 | 2018-10-02 | 中冶华天工程技术有限公司 | Parallel active coke dry-method desulfuration denitrating system |
| CN108744960B (en) * | 2018-06-14 | 2021-06-18 | 华北电力大学（保定） | Device and method for simultaneously desulfurizing, denitrifying, removing mercury and recycling flue gas |
| CN108796215B (en) * | 2018-06-25 | 2019-12-06 | 中南大学 | treatment method of waste desulfurizer |
| CN108715930B (en) * | 2018-06-25 | 2019-12-06 | 中南大学 | Treatment method for applying waste desulfurizer to sintering |
| CN110090541A (en) * | 2019-05-23 | 2019-08-06 | 西安热工研究院有限公司 | A kind of system and method for activated coke combined desulfurization and denitration |
| CN110538560A (en) * | 2019-09-24 | 2019-12-06 | 北京中航泰达环保科技股份有限公司 | System and method for circularly combining desulfurization and ozone preoxidation denitration by using sintering flue gas |
| CN110953894A (en) * | 2019-12-16 | 2020-04-03 | 北京中航泰达环保科技股份有限公司 | Sintering machine flue gas circulation purification and waste heat utilization system and method |
| CN110975603A (en) * | 2019-12-16 | 2020-04-10 | 北京中航泰达环保科技股份有限公司 | Combined flue gas circulation, grading, purification and waste heat utilization device and method for multiple sintering machines |
| CN111589303A (en) * | 2020-06-03 | 2020-08-28 | 中冶华天工程技术有限公司 | Sintering flue gas combined desulfurization and denitrification system |
| CN113509827B (en) * | 2021-04-19 | 2022-05-03 | 中冶长天国际工程有限责任公司 | Temperature control method in sintering flue gas multi-pollutant treatment process |
| CN113834340A (en) * | 2021-09-28 | 2021-12-24 | 中国华能集团清洁能源技术研究院有限公司 | Low-temperature desulfurization and denitrification method and system for flue gas of sintering machine of steel mill |
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| CN102430318B (en) * | 2011-11-11 | 2014-06-04 | 上海克硫环保科技股份有限公司 | System for desulfurizing and denitrating active coke flue gas, and process method |
| CN103900391B (en) * | 2014-04-14 | 2015-07-08 | 北京京诚泽宇能源环保工程技术有限公司 | Selective sintering-machine flue-gas heat exchange and denitration system and method thereof |
| CN105135895B (en) * | 2015-08-03 | 2017-08-29 | 郑琨 | A kind of selective sintering flue gas segmented comprehensive processing technique |
| CN105091615B (en) * | 2015-08-06 | 2017-10-31 | 中南大学 | A kind of integrated conduct method of agglomeration for iron mine flue gas pollutant |
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