CN210473618U - Low temperature SCR denitrification facility in steel rolling heating furnace flue gas dry desulfurization - Google Patents
Low temperature SCR denitrification facility in steel rolling heating furnace flue gas dry desulfurization Download PDFInfo
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Abstract
The utility model relates to a steel rolling heating furnace flue gas dry desulfurization medium and low temperature SCR denitration device, which comprises a desulfurizer grinding and conveying system, a desulfurizer adding device, a dust remover, a heating furnace, a medium and low temperature SCR denitration reactor, a flue gas heat exchanger and a draught fan which are arranged from the flue gas inlet direction to the flue gas outlet direction in sequence; the desulfurizer conveying, grinding and conveying system comprises a Roots blower, a desulfurizer powder bin and a desulfurizer pulverizer which are sequentially arranged; the dust remover comprises a filter bag chamber, and a dust remover ash hopper, a middle box body of the dust remover, a filter bag, a pattern plate, a pulse ash removal device and an air purifying chamber are sequentially arranged in the filter bag chamber along the smoke inlet direction; the ash hopper of the dust remover is positioned at the flue gas inlet and is provided with a guide plate; the desulfurizer adding device is arranged at the upper position of the flue gas inlet of the dust remover and is connected with the desulfurizer conveying, grinding and conveying system.
Description
Technical Field
The utility model belongs to the field is handled in the integration of steel rolling heating furnace flue gas multi-pollutants, concretely relates to low temperature SCR denitrification facility in steel rolling heating furnace flue gas dry desulfurization.
Background
Because the production process of the steel rolling heating furnace produces dust and SO2And harmful substances such as NOx cause environmental pollution. With the increasing environmental emission standard and the increasing pollution treatment force of the state, the treatment of the flue gas of the steel rolling heating furnace has been proposed in the current way.
"iron and steel enterprises ultralow emission reconstruction working scheme (solicited comments draft)" (environmental atmospheric inclusion loop [2018 ]]No. 242) makes the following strict regulations on the smoke emission of the heavy spot area steel rolling heating furnace: under the condition that the reference oxygen content is 8 percent, the emission concentration of the particulate matters is less than or equal to 10mg/m3The sulfur dioxide emission concentration is less than or equal to 50mg/m3The concentration of nitrogen oxide emission is less than or equal to 150mg/m3. Therefore, the method is very important for efficiently purifying the smoke pollutants of the steel rolling heating furnace.
At present, the domestic market mainly adopts a 'semi-dry desulfurization before SCR denitration process' or a 'SCR denitration waste heat utilization before semi-dry desulfurization or wet desulfurization process' aiming at the flue gas purification of a steel rolling heating furnace. However, the two processes have the following defects: the semi-dry desulfurization or wet desulfurization equipment is more, the investment is large, the occupied area is large, the system resistance is large, the purity of desulfurization byproducts is not high, the utilization value is low, the wet desulfurization equipment is seriously blocked and corroded, the water consumption is large, the additional operation cost is increased in wastewater treatment, the moisture content of wet desulfurization flue gas is large, the flue gas contains various pollutants, a chimney has a large white smoke trailing site, and a whitening device and a wet electric dust collector are additionally arranged, so that the construction investment and the operation cost of a desulfurization system are greatly increased. Meanwhile, the process of first SCR denitration waste heat utilization and then semi-dry desulfurization or wet desulfurization has the phenomenon that a catalyst is easy to block and poison, and a pretreatment device needs to be additionally arranged before denitration, so that the running resistance and investment of a system are increased. Based on this, research and development of a steel rolling heating furnace flue gas multi-pollutant dry purification device and process are urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a low temperature SCR denitrification facility in steel rolling heating furnace flue gas dry desulfurization for the not enough of current steel rolling heating furnace flue gas treatment method of solution. It can not only treat fine particle dust and SO in the smoke of steel rolling heating furnace2、NOXDry purification treatment is carried out, and a coal smoke and air smoke system of the steel rolling heating furnace can share a desulfurizer pulverizer (the coal smoke and air smoke systems are relatively independent), so that the method has the advantages of small total investment, zero water consumption of the system, no tower desulfurization, low operation energy consumption, small occupied area, simple process, small maintenance amount and long service life of the catalyst.
In order to realize the above purpose, the utility model relates to a steel rolling heating furnace flue gas dry desulfurization medium and low temperature SCR denitrification facility's technical scheme does:
a steel rolling heating furnace flue gas dry desulfurization medium and low temperature SCR denitration device comprises a desulfurizer grinding and conveying system, a desulfurizer adding device, a dust remover, a heating furnace, a medium and low temperature SCR denitration reactor, a flue gas heat exchanger and an induced draft fan which are sequentially arranged from a flue gas inlet direction to a flue gas outlet direction;
the desulfurizer conveying, grinding and conveying system comprises a Roots blower, a desulfurizer powder bin and a desulfurizer pulverizer which are sequentially arranged;
the dust remover comprises a filter bag chamber, and a dust remover ash hopper, a middle box body of the dust remover, a filter bag, a pattern plate, a pulse ash removal device and an air purifying chamber are sequentially arranged in the filter bag chamber along the smoke inlet direction; the ash hopper of the dust remover is positioned at the flue gas inlet and is provided with a guide plate;
the desulfurizer adding device is arranged at the upper position of the flue gas inlet of the dust remover and is connected with the desulfurizer conveying, grinding and conveying system;
the gas outlet of the dust remover is connected with the gas inlet of the flue gas heat exchanger, a heating furnace is arranged between the gas outlet pipeline of the dust remover and the flue gas heat exchanger, a medium-low temperature SCR denitration reactor is arranged above the flue gas heat exchanger, an ammonia spraying grid and a static mixer are sequentially arranged in the gas inlet pipeline of the medium-low temperature SCR denitration reactor along the flue gas inlet direction, and the medium-low temperature SCR denitration reactor comprises a catalyst reservation layer and a catalyst layer which are sequentially arranged along the flue gas inlet direction;
the gas outlet of the medium-low temperature SCR denitration reactor is connected with a flue gas heat exchanger; the induced draft fan is arranged at the gas outlet of the flue gas heat exchanger.
Furthermore, two layers of catalyst layers are arranged in parallel up and down.
Further, a chimney is arranged at an air outlet of the induced draft fan.
Furthermore, the air purifying chamber is a high air purifying chamber with the height of 2.5-3.5 m, and a manhole is arranged on the air purifying chamber.
Furthermore, the ammonia injection grid is of a net structure and is formed by parallelly arranging a plurality of stainless steel pipes with small holes, the diameter of each small hole is 4-20 mm, the hole opening direction is along the flow direction of flue gas, and the distance between the small holes is 150-300 mm.
Further, the internal unit of the static mixer consists of cross bars, which are at 45 ° to the axis of the air inlet duct shell.
A steel rolling heating furnace flue gas dry desulfurization medium and low temperature SCR denitration process comprises the following steps:
(1) the flue gas of the steel rolling heating furnace enters an air inlet pipeline of a dust remover from a flue gas inlet, and a desulfurizer adding device is arranged in the air inlet pipeline of the dust remover; firstly, supplying coarse powder desulfurizer to a desulfurizer powder bin, finely grinding the coarse powder desulfurizer to 20-25 mu m by a desulfurization grinding mill, finally conveying the coarse powder desulfurizer to a desulfurizer adding device through a conveying pipeline under the action of a Roots blower, uniformly spraying the coarse powder desulfurizer into an air inlet pipeline of a dust remover, thermally activating the desulfurizer in the air inlet pipeline of the dust remover, rapidly increasing the specific surface area, fully contacting with acidic flue gas, carrying out physical and chemical reactions, and absorbing and purifying acidic substances in the flue gas of a heating furnace;
(2) the flue gas containing powder after absorbing acidic materials and drying enters a dust remover for further desulfurization reaction and smoke dust purification, and particulate matters in the flue gas are prevented from blocking a flue gas heat exchanger and a catalyst layer; the air inlet of the dust hopper of the dust collector is provided with a guide plate, the guide plate performs inertia pre-separation on large particles in the smoke, meanwhile, the guide plate has an even distribution effect on the airflow entering the bag chamber, so that the airflow is uniformly distributed in the inner section of the box body of the dust collector, the smoke gradually rises along the gaps of the filter bags, dust is filtered by the filter bags, and finally the filtered smoke is discharged from the small holes of the pattern plate and enters the air purifying chamber; the filter bag is provided with a pulse dust cleaning device, and when dust on the surface of the filter bag is accumulated, the filter bag is cleaned on line by blowing compressed air or nitrogen;
(3) the flue gas after desulfurization and dust removal enters a flue gas heat exchanger, the raw flue gas is heated by using the high-temperature clean flue gas after denitration, then the flue gas is heated to a catalyst reaction activity temperature range under the synergistic action of a heating furnace and enters a medium-low temperature SCR denitration reactor for denitration reaction, and nitrogen oxides in the flue gas are removed; an ammonia spraying grid is arranged in an air inlet pipeline of the medium-low temperature SCR denitration reactor, and ammonia gas with volume concentration less than 5% which is uniformly sprayed through the ammonia spraying grid and raw flue gas are preliminarily mixed in a static mixer; the internal unit of the static mixer is composed of cross bars, the cross bars and the axis of the air inlet pipeline shell form an angle of 45 degrees, and liquid drops can be dispersed to 2-5 mu m;
the preliminarily mixed ammonia gas/flue gas mixed gas enters a medium-low temperature SCR denitration reactor; a catalyst layer and a catalyst reservation layer are arranged in the middle-low temperature SCR denitration reactor, the uniformly mixed flue gas and ammonia gas are buffered for a certain distance and enter the catalyst layer, and the ammonia gas and nitrogen oxides in the flue gas are subjected to chemical reaction under the catalytic action of the catalyst layer to generate nitrogen gas and water vapor;
(4) and finally, the purified flue gas subjected to desulfurization, dust removal and denitration enters a flue gas heat exchanger to exchange heat with the original low-temperature flue gas, and the flue gas subjected to heat exchange is finally discharged into the atmosphere from a flue gas outlet flue to the original chimney under the action of an induced draft fan.
Further, in the step (3), when the catalyst reaches the active life cycle, installing a new catalyst on the catalyst reserve layer.
The technical effects of the utility model reside in that: not only can treat fine particle dust, sulfur dioxide and NO in the smoke of a steel rolling heating furnaceXAnd the like, and the device realizes the dry treatment with zero water consumption. Meanwhile, the device adopts a process of firstly desulfurizing and dedusting and then removing nitrogen oxides, so that the medium and low temperature SCR catalyst can be safely and efficiently operated, the abrasion of dust to the catalyst is effectively avoided, and the impurities in the flue gas are prevented from poisoning the medium and low temperature SCR catalyst, thereby influencing the medium and low temperature SCR denitration efficiency. In conclusion, the dry purification device and the process are reliable in operation, and pollutants in the flue gas of the heating furnace can reach 'transformation working scheme (request draft) of ultralow emission of iron and steel enterprises' (environmental atmosphere content [2018 ]]242) required emission limit.
Drawings
FIG. 1 is a schematic diagram of the system architecture;
in the figure: the method comprises the following steps of 1-a Roots blower, 2-a desulfurizer powder bin, 3-a desulfurizer pulverizer, 4-a desulfurizer adding device, 5-a guide plate, 6-a dust collector ash bucket, 7-a dust collector middle box body, 8-a filter bag, 9-a pattern plate, 10-a pulse ash removal device, 11-an air purifying chamber, 12-a heating furnace, 13-an ammonia spraying grid, 14-a static mixer, 15-a catalyst reserved layer, 16-a catalyst layer, 17-a medium-low temperature SCR denitration reactor, 18-GGH (gas heater), 19-an induced draft fan and 20-a chimney.
Detailed Description
In order to more vividly explain the concrete implementation steps of the present invention, the following further description will be made with reference to the accompanying drawings:
the dust remover of the utility model is a cloth bag dust remover.
Referring to the attached drawings, the steel rolling heating furnace flue gas dry desulfurization medium and low temperature SCR denitration device comprises a Roots blower 1, a desulfurizer powder bin 2, a desulfurizer pulverizer 3, a desulfurizer adding device 4, a dust remover, a heating furnace 12, a medium and low temperature SCR denitration reactor 17, a GGH18 and a draught fan 19, wherein a desulfurizer adding device 4 is arranged in a flue in front of an inlet of the dust remover, the desulfurizer adding device 4 is connected with a desulfurizer conveying and grinding conveying system, and the desulfurizer grinding and conveying system comprises the Roots blower 1, the desulfurizer powder bin 2 and the desulfurizer pulverizer 3. The dust remover comprises a filter bag chamber, and the filter bag chamber comprises a dust remover ash hopper 6, a dust remover middle box body 7 and an air purifying chamber 11. The gas outlet of the dust remover is connected with the gas inlet of the GGH18, the flue gas enters the medium and low temperature SCR denitration reactor 17 after being heated by the GGH and the heating furnace 12, an ammonia injection grid 13 and a static mixer 14 are arranged in the gas inlet pipeline of the medium and low temperature SCR denitration reactor 17, and the medium and low temperature SCR denitration reactor 17 comprises a catalyst layer 16, a catalyst reserved layer 15 and the like. The air outlet of the medium-low temperature SCR denitration reactor 17 is connected with GGH 18. And finally, returning the treated clean flue gas to the original chimney 20 of the heating furnace for discharge under the action of the induced draft fan 19. The device can realize the synergistic dry processing of multiple pollutants such as particulate matters, sulfur dioxide, nitrogen oxides and the like. The specific implementation steps are as follows:
(1) and the smoke of the steel rolling heating furnace enters the air inlet pipeline of the dust remover from the air inlet. A desulfurizer adding device 4 is arranged in the air inlet pipeline of the dust remover. Firstly, a coarse powder desulfurizer is supplied to a desulfurizer powder bin 2, is finely ground to 20-25 mu m by a desulfurization grinding machine 3, and is finally conveyed to a desulfurizer adding device 4 through a conveying pipeline under the action of a Roots blower 1 and is uniformly sprayed in an air inlet pipeline of a dust remover, the desulfurizer is thermally activated in the air inlet pipeline of the dust remover, the specific surface area is rapidly increased, the desulfurizer is fully contacted with acid flue gas to generate physical and chemical reactions, and SO in the flue gas of a heating furnace2Etc. are absorbed and purified.
The main reaction chemical equation is as follows:
2NaHCO3+SO2+1/2O2→Na2SO4+2CO2+H2O
2NaHCO3+SO3→Na2SO4+2CO2+H2O
with other acidic substances (e.g. SO)3Etc.):
NaHCO3+HCL→NaCl+CO2+H2O
NaHCO3+HF→NaF+CO2+H2O
(2) by absorption of SO2The flue gas containing the acidic substances and dried powder enters a dust remover for further desulfurization reaction and smoke purification, and the blockage of the GGH18 and the catalyst layer 16 by the particles in the flue gas is effectively prevented. The air inlet of the dust hopper 6 of the dust remover is provided with a guide plate 5, and the guide plate 5 performs inertia pre-separation on large particles in the flue gas. Meanwhile, the guide plates 5 have the function of uniformly distributing the airflow entering the bag chamber, so that the airflow is uniformly distributed on the inner section of the box body 7 in the dust remover. The smoke gradually rises along the gap of the filter bag 8, dust is filtered by the filter bag 8, and finally the filtered smoke is discharged from the small holes of the flower plate 9 and enters the air purifying chamber 11. The air purifying chamber 11 is a high air purifying chamber with the height of 2.5-3.5 m and is provided with a manhole, and when the filter bag needs to be overhauled or replaced, the filter bag can be directly overhauled or replaced in the air purifying chamber. Meanwhile, the arrangement mode of the high air purifying chamber can effectively avoid the problems of poor sealing, water leakage and the like of the traditional low air purifying chamber (with an access door). The filter bag is provided with a pulse dust cleaning device 10, and when dust on the surface of the filter bag is accumulated to a certain degree, the dust cleaning device can clean dust on the filter bag on line by blowing compressed air or nitrogen.
(3) The flue gas after desulfurization and dust removal enters GGH18, the raw flue gas is heated by the high-temperature clean flue gas after denitration, then the flue gas temperature is raised to a catalyst reaction activity temperature range under the synergistic action of the heating furnace 12, and the flue gas enters the medium-low temperature SCR denitration reactor 17 for denitration reaction, so that nitrogen oxides in the flue gas are removed. An ammonia injection grid 13 is arranged in an air inlet pipeline of the medium-low temperature SCR denitration reactor 17, and ammonia gas with volume concentration less than 5% which is uniformly injected through the ammonia injection grid 13 and raw flue gas are preliminarily mixed in a static mixer 14. The ammonia injection grid is of a net structure and is formed by parallelly arranging a plurality of stainless steel pipes with small holes, the diameter of each small hole is 4-20 mm, the direction of each small hole is along the flow direction of flue gas, and the distance between every two small holes is 150-300 mm. The internal unit of the static mixer 14 consists of cross bars, and the cross bars and the axis of the tube shell form an angle of 45 degrees, so that liquid drops can be dispersed to 2-5 mu m.
The primarily mixed ammonia gas/flue gas mixed gas enters a medium-low temperature SCR denitration reactor 17. The inside 2 catalyst layers 16 and a catalyst reservation layer 15 that are equipped with of well low temperature SCR denitration reactor 17, flue gas and ammonia after the homogeneous mixing are through a distance buffering, get into catalyst layer 16. Under the catalytic action of the catalyst 16, the ammonia gas and the nitrogen oxides in the flue gas undergo a chemical reaction to generate nitrogen gas and water vapor. The main chemical reaction formula of the medium-low temperature SCR selective reduction denitration is as follows:
4NO+4NH3+O2→4N2+6H2O
6NO+4NH3→5N2+6H2O
6NO2+8NH3→3N2+6H2O
2NO2+4NH3+O2→3N2+6H2O
the denitration catalyst can be a catalyst in patent number ZL 201210167211.5 (an SCR flue gas denitration catalyst and a preparation method of titanium tungsten serving as a raw material of the SCR flue gas denitration catalyst), patent number ZL 201110149575.6 (a surface deposition type honeycomb flue gas denitration catalyst and a preparation method of the surface deposition type honeycomb flue gas denitration catalyst) or patent number ZL 200910145015.6 (a low-temperature selective catalytic reduction denitration catalyst and a preparation method of the low-temperature selective catalytic reduction denitration catalyst).
When the catalyst reaches or approaches the active life cycle, a new catalyst can be installed on the catalyst reserve layer 15 to ensure the denitration efficiency.
(4) And finally, enabling the purified flue gas subjected to desulfurization, dedusting and denitration to enter GGH18, and enabling the purified flue gas to exchange heat with the original low-temperature flue gas. The heat-exchanged flue gas is finally exhausted into the atmosphere from the outlet flue to the original chimney 20 under the action of the induced draft fan 19.
(5) Because the uniform distribution of the air flow plays a crucial role in desulfurization, dust removal and denitration, and the ammonia spraying uniformity and ammonia/flue gas mixing progressiveness in the SCR denitration reactor 17 determine the medium-low temperature SCR denitration effect. The device of the process adopts a Computational Fluid Dynamics (CFD) method to carry out numerical simulation optimization design on the device. The numerical simulation optimization method can adopt a numerical simulation optimization design method in a patent-bag type dust collector air flow organization multi-parameter optimization method (publication number CN 105912745A).
Claims (6)
1. The utility model provides a low temperature SCR denitrification facility in steel rolling heating furnace flue gas dry desulfurization which characterized in that: the system comprises a desulfurizer grinding and conveying system, a desulfurizer adding device (4), a dust remover, a heating furnace (12), a medium-low temperature SCR denitration reactor (17), a flue gas heat exchanger (18) and an induced draft fan (19) which are sequentially arranged from the direction of a flue gas inlet to the direction of a flue gas outlet;
the desulfurizer conveying, grinding and conveying system comprises a Roots blower (1), a desulfurizer powder bin (2) and a desulfurizer pulverizer (3) which are sequentially arranged;
the dust remover comprises a filter bag chamber, wherein a dust remover ash hopper (6), a dust remover middle box body (7), a filter bag (8), a pattern plate (9), a pulse ash removal device (10) and an air purifying chamber (11) are sequentially arranged in the filter bag chamber along the flue gas inlet direction; a guide plate (5) is arranged at the flue gas inlet of the dust remover ash hopper (6);
the desulfurizer adding device (4) is arranged at the upper position of the flue gas inlet of the dust remover, and the desulfurizer adding device (4) is connected with a desulfurizer conveying, grinding and conveying system;
the gas outlet of the dust remover is connected with the gas inlet of the flue gas heat exchanger (18), a heating furnace (12) is arranged between the gas outlet pipeline of the dust remover and the flue gas heat exchanger (18), a medium-low temperature SCR denitration reactor (17) is arranged above the flue gas heat exchanger (18), an ammonia spraying grid (13) and a static mixer (14) are sequentially arranged in the gas inlet pipeline of the medium-low temperature SCR denitration reactor (17) along the flue gas inlet direction, and the medium-low temperature SCR denitration reactor (17) comprises a catalyst reservation layer (15) and a catalyst layer (16) which are sequentially arranged along the flue gas inlet direction;
the gas outlet of the medium-low temperature SCR denitration reactor (17) is connected with a flue gas heat exchanger (18); and the induced draft fan (19) is arranged at the air outlet of the flue gas heat exchanger (18).
2. The steel rolling heating furnace flue gas dry desulfurization medium and low temperature SCR denitration device according to claim 1, characterized in that: the catalyst layer (16) is arranged in two layers in parallel up and down.
3. The steel rolling heating furnace flue gas dry desulfurization medium and low temperature SCR denitration device according to claim 1, characterized in that: a chimney (20) is arranged at the air outlet of the induced draft fan (19).
4. The steel rolling heating furnace flue gas dry desulfurization medium and low temperature SCR denitration device according to claim 1, characterized in that: the air purifying chamber (11) is a high air purifying chamber with the height of 2.5-3.5 m, and a manhole is arranged on the air purifying chamber (11).
5. The steel rolling heating furnace flue gas dry desulfurization medium and low temperature SCR denitration device according to claim 1, characterized in that: the ammonia injection grid (13) is of a net structure and is formed by parallelly arranging a plurality of stainless steel pipes with small holes, the diameter of each small hole is 4-20 mm, the hole opening direction is along the flow direction of flue gas, and the distance between the small holes is 150-300 mm.
6. The steel rolling heating furnace flue gas dry desulfurization medium and low temperature SCR denitration device according to claim 1, characterized in that: the internal unit of the static mixer (14) consists of cross bars, which are at 45 ° to the axis of the air inlet duct shell.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110252140A (en) * | 2019-07-25 | 2019-09-20 | 河北威达蓝海环保科技有限公司 | Low temperature SCR denitration device and technique in a kind of heater for rolling steel flue gas dry desulfurizing |
| CN111888925A (en) * | 2020-08-03 | 2020-11-06 | 北京予知环保科技有限公司 | Dry desulfurization assembly, desulfurization dust removal unit, integrated equipment and system |
| CN112403215A (en) * | 2020-11-17 | 2021-02-26 | 安徽威达环保科技股份有限公司 | Dry-process ultra-clean integrated treatment device and process for high-sulfur coke oven flue gas |
-
2019
- 2019-07-25 CN CN201921185076.0U patent/CN210473618U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110252140A (en) * | 2019-07-25 | 2019-09-20 | 河北威达蓝海环保科技有限公司 | Low temperature SCR denitration device and technique in a kind of heater for rolling steel flue gas dry desulfurizing |
| CN111888925A (en) * | 2020-08-03 | 2020-11-06 | 北京予知环保科技有限公司 | Dry desulfurization assembly, desulfurization dust removal unit, integrated equipment and system |
| CN112403215A (en) * | 2020-11-17 | 2021-02-26 | 安徽威达环保科技股份有限公司 | Dry-process ultra-clean integrated treatment device and process for high-sulfur coke oven flue gas |
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Address after: 056000 intersection of GuDi street and Houde Road, Matou Economic Development Zone, Jinan new district, Handan City, Hebei Province Patentee after: Hebei Weida Blue Ocean Environmental Protection Technology Co.,Ltd. Address before: 056000 intersection of GuDi street and Houde Road, Matou Economic Development Zone, Jinan new district, Handan City, Hebei Province Patentee before: HEBEI WEIDA BLUE OCEAN ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. |