CN115090091A - Device and method for removing escaped ammonia in waste incineration flue gas by using citric acid - Google Patents
Device and method for removing escaped ammonia in waste incineration flue gas by using citric acid Download PDFInfo
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- CN115090091A CN115090091A CN202210740037.2A CN202210740037A CN115090091A CN 115090091 A CN115090091 A CN 115090091A CN 202210740037 A CN202210740037 A CN 202210740037A CN 115090091 A CN115090091 A CN 115090091A
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- flue gas
- citric acid
- flue
- waste incineration
- ammonia
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- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 title claims abstract description 162
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 86
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 239000003546 flue gas Substances 0.000 title claims abstract description 79
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 42
- 238000004056 waste incineration Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000006243 chemical reaction Methods 0.000 claims abstract description 26
- 239000002245 particle Substances 0.000 claims abstract description 17
- 239000000428 dust Substances 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 4
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 14
- YWYZEGXAUVWDED-UHFFFAOYSA-N triammonium citrate Chemical compound [NH4+].[NH4+].[NH4+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O YWYZEGXAUVWDED-UHFFFAOYSA-N 0.000 claims description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 5
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 5
- 239000004571 lime Substances 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000002918 waste heat Substances 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 238000000746 purification Methods 0.000 abstract description 5
- 238000006477 desulfuration reaction Methods 0.000 abstract description 2
- 230000023556 desulfurization Effects 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 5
- 239000004202 carbamide Substances 0.000 description 5
- 238000005192 partition Methods 0.000 description 5
- 239000007787 solid Substances 0.000 description 3
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 229910004261 CaF 2 Inorganic materials 0.000 description 1
- 230000009615 deamination Effects 0.000 description 1
- 238000006481 deamination reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- 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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/58—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- 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
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/70—Organic acids
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a device and a method for removing escaped ammonia in waste incineration flue gas by using citric acid, and belongs to the technical field of flue gas purification. The device comprises a semi-dry deacidification tower, a reaction flue, a bag-type dust remover, a citric acid ejector and an active carbon ejector; a flue gas outlet of the semi-dry deacidification tower is connected with a flue gas inlet at the bottom of the reaction flue through a pipeline; a flue gas outlet at the top of the reaction flue is connected with a bag-type dust collector through a pipeline; the citric acid ejector and the activated carbon ejector are respectively arranged at the upstream of the reaction flue and are respectively used for ejecting citric acid liquid drops and activated carbon particles. The invention can actively remove ammonia gas in flue gas and reduce the emission of nitrogen oxides while ensuring the desulfurization and denitrification effects of the prior SNCR and SCR systems, and has the advantages of high efficiency, environmental protection and low cost.
Description
Technical Field
The invention belongs to the technical field of flue gas purification, and particularly relates to a device and a method for removing escaped ammonia in waste incineration flue gas by using citric acid.
Background
In the conventional flue gas purification process of waste incineration, an SNCR (selective non-catalytic reduction) process is usually adopted, ammonia water or urea is sprayed into high-temperature flue gas at 850-900 ℃, and NO is added x Reduction to N 2 (ii) a For ultra-low emission projects, an SCR (selective catalytic reduction) process is also commonly used, and NO is further reduced by using a catalyst x The emission value of (c). However, the efficiency of SNCR and SCR is limited by the mixing degree of ammonia or urea with the flue gas, the residence time, the reaction temperature, etc., and the ammonia or urea is usually used in an excessive amount, so that the flue gas contains unreacted ammonia (the ammonia is usually called slip ammonia) and the concentration thereof depends on the excessive amount of ammonia or urea.
The existing control mode of ammonia escape from flue gas is mostly concentrated on reasonably controlling the injection amount of ammonia water/urea in SNCR and SCR, or ammonia gas is further mixed with NO by utilizing a catalyst x Reacting, and not absorbing or removing escaped ammonia; or a whole set of process is added, and ammonia in the flue gas is specially removed. The methods are all high in cost and are not beneficial to field reconstruction of existing projects.
ZL202121327958.3 discloses a flue gas ammonia removal reactor, which is characterized in that solid ammonia removal agents are uniformly distributed on a partition plate, so that flue gas can uniformly pass through the partition plate to achieve the effect of removing ammonia in the flue gas. However, in the patent, the deamination agent is uniformly distributed on the partition plates, and the smoke gas needs to stay for a certain time near the partition plates, so that a plurality of layers of partition plates need to be arranged, a special reactor is arranged, the flow rate of the smoke gas is reduced, and the pressure loss of a system is increased.
Disclosure of Invention
The technical problem to be solved is as follows: aiming at the technical problems, the invention provides a device and a method for removing escaped ammonia in waste incineration flue gas by using citric acid, which can actively remove ammonia in the flue gas and reduce emission of nitrogen oxides while ensuring the desulfurization and denitrification effects of the prior SNCR and SCR systems, and have the advantages of high efficiency, environmental protection and low cost.
The technical scheme is as follows: a device for removing escaped ammonia in waste incineration flue gas by using citric acid comprises a semidry process deacidification tower, a reaction flue, a bag-type dust remover, a citric acid ejector and an active carbon ejector; a flue gas outlet of the semi-dry deacidification tower is connected with a flue gas inlet at the bottom of the reaction flue through a pipeline; a flue gas outlet at the top of the reaction flue is connected with a bag-type dust collector through a pipeline; the citric acid ejector and the activated carbon ejector are respectively arranged at the upstream of the reaction flue and are respectively used for ejecting citric acid liquid drops and activated carbon particles.
Preferably, the included angle between the injection direction of the citric acid injector and the flow direction of the flue gas is 30-45 degrees.
Preferably, the length of the reaction flue is 4-6 m.
Preferably, the flue gas temperature at the flue gas inlet of the reaction flue is 140-160 ℃.
Preferably, a rotary atomizer is arranged in the top of the semi-dry deacidification tower and used for spraying lime slurry.
Preferably, the top of the semi-dry deacidification tower is provided with a flue gas inlet for receiving flue gas of a waste heat boiler.
Preferably, the device still includes draught fan and chimney, the gas outlet of sack cleaner passes through the gas inlet of tube coupling draught fan, the gas outlet of draught fan passes through the gas inlet of tube coupling chimney.
A method for removing escaped ammonia in waste incineration flue gas by using citric acid comprises the following steps: the waste incineration flue gas enters a reaction flue after being treated by a semi-dry deacidification tower, escaped ammonia in the waste incineration flue gas reacts with citric acid liquid drops sprayed by a citric acid sprayer to generate ammonium citrate to be removed, and simultaneously enters a bag-type dust collector after being adsorbed by activated carbon particles sprayed by an activated carbon sprayer to further remove the particles in the flue gas.
Preferably, the citric acid droplets are a saturated aqueous solution of citric acid.
Has the beneficial effects that: the citric acid is adopted to remove escaped ammonia in the flue gas, so that the ammonia in the flue gas can be actively removed while the removal effect of SNCR and SCR systems is ensured, and NO is not influenced x Discharging after reaching the standard;
the sprayed citric acid liquid drops are instantly evaporated to be small particles, and can be directly removed by using the original bag-type dust remover without adding new flue gas purification equipment except a citric acid ejector;
the generated ammonium citrate has good thermal stability, can be decomposed at the temperature of more than 190 ℃, can ensure that the ammonium citrate is not decomposed into ammonia and citric acid again after ammonia is removed, can further absorb heavy metals and dioxin in flue gas, and reduces environmental pollution.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
the numerical designations in the drawings represent the following: 1. a semi-dry deacidification tower; 2. a reaction flue; 3. a bag-type dust collector; 4. a citric acid sprayer; 5. an activated carbon injector; 6. rotating the atomizer; 7. an induced draft fan; 8. and (4) a chimney.
Detailed Description
The invention is further described below with reference to the accompanying drawings and specific embodiments.
Example 1
As shown in fig. 1, a device for removing escaped ammonia in waste incineration flue gas by using citric acid comprises a semidry process deacidification tower 1, a reaction flue 2, a bag-type dust collector 3, a citric acid injector 4, an activated carbon injector 5, an induced draft fan 7 and a chimney 8.
The top of the semi-dry deacidification tower 1 is provided with a flue gas inlet for receiving flue gas of a waste heat boiler; the inner side of the top is provided with a rotary atomizer 6 for spraying lime slurry; the flue gas outlet at the bottom of the reaction flue is connected with the flue gas inlet at the bottom of the reaction flue 2 through a pipeline.
The length of the reaction flue 2 is 4-6 m, and sufficient reaction time can be provided. The temperature of the flue gas at the flue gas inlet at the bottom is 160 ℃, and the flue gas outlet at the top is connected with a bag-type dust collector 3 through a pipeline; the citric acid injector 4 and the activated carbon injector 5 are respectively arranged at the upstream of the reaction flue 2 and are respectively used for injecting citric acid liquid drops and activated carbon particles. Wherein the included angle between the injection direction of the citric acid injector 4 and the flow direction of the flue gas is 30-45 degrees.
The gas outlet of the bag-type dust collector 3 is connected with the gas inlet of the induced draft fan 7 through a pipeline, and the gas outlet of the induced draft fan 7 is connected with the gas inlet of the chimney 8 through a pipeline.
The method for removing the escaped ammonia in the waste incineration flue gas by using the device comprises the following steps:
waste incineration flue gas (200-220 ℃) from a waste heat boiler enters a semi-dry deacidification tower 1, the lime slurry sprayed by a rotary atomizer 6 is treated, the lime slurry is evaporated to dryness to become solid small particles, and meanwhile, HF, HCl and SO in the flue gas 2 、CO 2 Fully react to generate CaF 2 、CaCl 2 、CaSO 3 、CaCO 3 And (3) discharging particles, wherein part of the particles are discharged from a conical section at the bottom of the semi-dry deacidification tower 1, and a small amount of particles are carried to a rear section by flue gas. The treated flue gas enters a reaction flue 2, escaping ammonia in the flue gas reacts with citric acid liquid drops sprayed by a citric acid sprayer 4 to generate ammonium citrate to be removed, and simultaneously the ammonium citrate is adsorbed by activated carbon particles sprayed by an activated carbon sprayer 5 and enters a bag-type dust collector 3 to further remove the particles in the flue gas, and finally the flue gas is discharged to the atmosphere through a chimney 8 by a draught fan 7.
The citric acid liquid drops are saturated aqueous solution of citric acid, and small solid particles of the citric acid can also be used to be matched with pneumatic conveying equipment.
The method adopts the citric acid to remove the escaped ammonia in the flue gas for the first time, can actively remove the ammonia in the flue gas while ensuring the removal effect of the SNCR and SCR systems, and does not influence NO x The discharge reaches the standard;the sprayed citric acid liquid drops are instantly evaporated to be small particles, and can be directly removed by using the original bag-type dust remover 3 without adding new flue gas purification equipment except the citric acid ejector 4; the generated ammonium citrate has good thermal stability, can be decomposed at the temperature of more than 190 ℃, can ensure that the ammonium citrate is not decomposed into ammonia and citric acid again after ammonia is removed, can further absorb heavy metals and dioxin in flue gas, and reduces environmental pollution.
Claims (9)
1. A device for removing escaped ammonia in waste incineration flue gas by using citric acid is characterized by comprising a semidry deacidification tower (1), a reaction flue (2), a bag-type dust collector (3), a citric acid ejector (4) and an active carbon ejector (5); a flue gas outlet of the semi-dry deacidification tower (1) is connected with a flue gas inlet at the bottom of the reaction flue (2) through a pipeline; a flue gas outlet at the top of the reaction flue (2) is connected with a bag-type dust collector (3) through a pipeline; the citric acid ejector (4) and the activated carbon ejector (5) are respectively arranged at the upstream of the reaction flue (2) and are respectively used for ejecting citric acid liquid drops and activated carbon particles.
2. The device for removing escaped ammonia in waste incineration flue gas by using citric acid according to claim 1, wherein the included angle between the injection direction of the citric acid injector (4) and the flow direction of the flue gas is 30-45 °.
3. The device for removing ammonia escaping from waste incineration flue gas by using citric acid as claimed in claim 1, wherein the length of the reaction flue (2) is 4-6 m.
4. The device for removing ammonia escaping from waste incineration flue gas by using citric acid as claimed in claim 1, wherein the flue gas temperature at the flue gas inlet of the reaction flue (2) is 140-160 ℃.
5. The device for removing escaped ammonia in flue gas from waste incineration by using citric acid according to claim 1, wherein a rotary atomizer (6) is arranged in the top of the semidry deacidification tower (1) for spraying lime slurry.
6. The device for removing escaped ammonia in waste incineration flue gas by using citric acid according to claim 1, wherein a flue gas inlet is arranged at the top of the semidry deacidification tower (1) and is used for receiving flue gas of a waste heat boiler.
7. The device for removing ammonia escaping from waste incineration flue gas by using citric acid according to claim 1, further comprising an induced draft fan (7) and a chimney (8), wherein a gas outlet of the bag-type dust collector (3) is connected with a gas inlet of the induced draft fan (7) through a pipeline, and a gas outlet of the induced draft fan (7) is connected with a gas inlet of the chimney (8) through a pipeline.
8. The method for removing the escaped ammonia in the waste incineration flue gas by using the citric acid of the device in claim 1 comprises the following steps: the waste incineration flue gas enters a reaction flue (2) after being treated by a semi-dry deacidification tower (1), escaped ammonia in the flue gas reacts with citric acid liquid drops sprayed by a citric acid sprayer (4) to generate ammonium citrate to be removed, and simultaneously enters a bag-type dust remover (3) after being adsorbed by activated carbon particles sprayed by an activated carbon sprayer (5) to further remove the particles in the flue gas.
9. The method for removing ammonia escaping from waste incineration flue gas by using citric acid as claimed in claim 8, wherein the citric acid droplets are saturated aqueous solution of citric acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210740037.2A CN115090091B (en) | 2022-06-28 | 2022-06-28 | Device and method for removing escaped ammonia in waste incineration flue gas by using citric acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210740037.2A CN115090091B (en) | 2022-06-28 | 2022-06-28 | Device and method for removing escaped ammonia in waste incineration flue gas by using citric acid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115090091A true CN115090091A (en) | 2022-09-23 |
| CN115090091B CN115090091B (en) | 2024-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210740037.2A Active CN115090091B (en) | 2022-06-28 | 2022-06-28 | Device and method for removing escaped ammonia in waste incineration flue gas by using citric acid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115779665A (en) * | 2023-01-30 | 2023-03-14 | 上海境业环保能源科技股份有限公司 | Fluidized bed granulator tail gas purification system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130334466A1 (en) * | 2009-04-22 | 2013-12-19 | Babcock & Wilcox Power Generation Group, Inc. | System and method for reducing halogen levels necessary for mercury control, increasing the service life and/or catalytic activity of an scr catalyst and/or control of multiple emissions |
| CN110624384A (en) * | 2019-10-17 | 2019-12-31 | 中国环境保护集团有限公司 | Purification treatment method and purification treatment device for waste incineration flue gas |
| CN212576008U (en) * | 2020-05-30 | 2021-02-23 | 河南科智宏环保科技有限公司 | Purification device for removing SNCR and SCR escaped ammonia |
| CN113289475A (en) * | 2021-05-13 | 2021-08-24 | 天津中材工程研究中心有限公司 | Method for reducing ammonia escape after SNCR or SCR denitration |
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2022
- 2022-06-28 CN CN202210740037.2A patent/CN115090091B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130334466A1 (en) * | 2009-04-22 | 2013-12-19 | Babcock & Wilcox Power Generation Group, Inc. | System and method for reducing halogen levels necessary for mercury control, increasing the service life and/or catalytic activity of an scr catalyst and/or control of multiple emissions |
| CN110624384A (en) * | 2019-10-17 | 2019-12-31 | 中国环境保护集团有限公司 | Purification treatment method and purification treatment device for waste incineration flue gas |
| CN212576008U (en) * | 2020-05-30 | 2021-02-23 | 河南科智宏环保科技有限公司 | Purification device for removing SNCR and SCR escaped ammonia |
| CN113289475A (en) * | 2021-05-13 | 2021-08-24 | 天津中材工程研究中心有限公司 | Method for reducing ammonia escape after SNCR or SCR denitration |
Non-Patent Citations (1)
| Title |
|---|
| 冯丹编: "《大气污染控制技术》", 北京冶金工业出版社, pages: 136 - 137 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115779665A (en) * | 2023-01-30 | 2023-03-14 | 上海境业环保能源科技股份有限公司 | Fluidized bed granulator tail gas purification system |
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| CN115090091B (en) | 2024-01-30 |
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