CN110882615A - Device for oxidizing and removing mercury in coal-fired power plant by using waste denitration catalyst - Google Patents
Device for oxidizing and removing mercury in coal-fired power plant by using waste denitration catalyst Download PDFInfo
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- CN110882615A CN110882615A CN201911231135.8A CN201911231135A CN110882615A CN 110882615 A CN110882615 A CN 110882615A CN 201911231135 A CN201911231135 A CN 201911231135A CN 110882615 A CN110882615 A CN 110882615A
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- fluidized bed
- denitration catalyst
- coal
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- fired power
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- 239000003054 catalyst Substances 0.000 title claims abstract description 53
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 229910052753 mercury Inorganic materials 0.000 title claims abstract description 43
- 239000002699 waste material Substances 0.000 title claims abstract description 21
- 230000001590 oxidative effect Effects 0.000 title description 2
- 239000000428 dust Substances 0.000 claims abstract description 33
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000003546 flue gas Substances 0.000 claims abstract description 31
- 230000003647 oxidation Effects 0.000 claims abstract description 17
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 17
- 238000003795 desorption Methods 0.000 claims abstract description 5
- 239000008187 granular material Substances 0.000 claims description 12
- 229910001220 stainless steel Inorganic materials 0.000 claims description 11
- 239000010935 stainless steel Substances 0.000 claims description 11
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 239000003245 coal Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 abstract description 8
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 230000002349 favourable effect Effects 0.000 abstract description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
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- 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
- B01D53/75—Multi-step processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
-
- 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
- B01D53/64—Heavy metals or compounds thereof, e.g. mercury
-
- 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
- B01D53/86—Catalytic processes
- B01D53/8665—Removing heavy metals or compounds thereof, e.g. mercury
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (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)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention relates to a device for removing mercury in a coal-fired power plant by using waste denitration catalyst through oxidation, which comprises a fluidized bed, a cyclone separator, a dust remover and a blower, wherein the fluidized bed is cylindrical, a disc-shaped distribution plate is horizontally fixed at the lower end in the fluidized bed, air holes are distributed on the distribution plate, catalyst particles are filled in the fluidized bed and above the distribution plate, the catalyst particles are waste denitration catalysts, the lower end of the fluidized bed is communicated with a flue gas inlet pipe, the upper end of the fluidized bed is communicated with a cyclone separator through a first communicating pipe, the cyclone separator is communicated with a dust remover through a second communicating pipe, the flue gas exit tube has been put through on this dust remover, utilizes the mercury in the oxidation desorption flue gas of discarded denitration catalyst, both can reduce the mercury emission, can make discarded denitration catalyst recycle again, has reduced economic cost, more is favorable to the environmental protection.
Description
Technical Field
The invention relates to the technical field of mercury removal equipment of a thermal power plant, in particular to a device for removing mercury of a coal-fired power plant by using waste denitration catalyst through oxidation.
Background
Atmospheric mercury pollution has strong toxicity, mobility and biological enrichment and has attracted wide attention worldwide, flue gas of a coal-fired power plant contains conventional pollutants such as smoke dust, sulfur dioxide, nitrogen oxides and the like, and also contains unconventional pollutant mercury, which is one of important sources of the atmospheric mercury pollution, in 2013, in 10 months, under the United nations environmental planning agency (UNEP) organization, international society passes through the water-good convention about mercury, China signs the convention as the first contracted country, in 2011, GB13223-2011 is made in China, mercury and compounds thereof are brought into the convention, and the convention is implemented at 1 st 1 th of 2015, in the coal-fired flue gas, the existence form of mercury mainly comprises three mercury (Hg) in the form of elementary substance (Hg0) Particulate mercury (Hg)p) And divalent mercury (Hg)2+) The particle mercury can be removed through dust removal of the dust remover, the bivalent mercury is dissolved in water and can be removed through spraying of slurry of the absorption tower, only elemental mercury is difficult to remove, meanwhile, the service life of the denitration catalyst in the coal-fired unit is only 3-5 years, the waste denitration catalyst is regarded as dangerous waste by the nation, and the treatment cost of the denitration catalyst needs to be increased. Therefore, the two problems are the technical problems to be solved urgently by the coal-fired power plant.
Disclosure of Invention
In order to solve the problems, the invention provides a device for removing mercury in a coal-fired power plant by using waste denitration catalyst through oxidation.
The specific contents are as follows: the utility model provides an utilize abandonment denitration catalyst oxidation desorption coal fired power plant mercury device, the device includes fluidized bed, cyclone, dust remover and air-blower, characterized by:
the fluidized bed be cylindric, be fixed with discoid distribution plate at the inside lower extreme level of fluidized bed, be covered with the gas pocket on the distribution plate, the inside of fluidized bed just is located the distribution plate top and fills there is the catalyst granule, this catalyst granule is dumped denitration catalyst, the lower extreme switch-on of fluidized bed has the flue gas to advance the pipe, the upper end of fluidized bed is through first communicating pipe and cyclone switch-on, cyclone passes through second communicating pipe and dust remover switch-on, the switch-on has the flue gas exit tube on this dust remover.
Preferably, the lower end of the cyclone separator is communicated with the fluidized bed through a first return pipe, and the communicated position of the first return pipe and the fluidized bed is positioned above the distribution plate.
Preferably, a blower pipe is connected to the blower, and the blower pipe is connected to the first return pipe.
Preferably, the lower end of the dust remover is provided with at least two ash hoppers, and each ash hopper is communicated with the blast pipe through a second return pipe.
Preferably, the fluidized bed is made of stainless steel, and the stainless steel is at least 316L grade stainless steel.
Preferably, the periphery outside the fluidized bed is coated with a heat-insulating layer.
Preferably, the distribution plate is made of stainless steel with at least 2205 grades.
Preferably, the aperture size of the air holes on the distribution plate is 10mm-100mm, and the aperture ratio of the distribution plate is 30% -45%.
Preferably, the dust remover is an electrostatic dust remover or a bag-type dust remover.
Preferably, the blower is a centrifugal fan.
The invention has the beneficial technical effects that:
the invention relates to a device for removing mercury in a coal-fired power plant by using waste denitration catalyst, wherein flue gas enters from a flue gas inlet pipe, elemental mercury in the flue gas enters a fluidized bed along with the flue gas from a distribution plate, and reacts with oxygen in the flue gas through the catalytic action of catalyst particles to generate bivalent mercury, the bivalent mercury is easy to dissolve in water, and finally the flue gas containing the bivalent mercury is removed by spraying slurry in an absorption tower; wherein cyclone and dust remover constitute the recovery system of catalyst granule, wherein cyclone is the mainly used collection large granule catalyst, and the dust remover mainly used retrieves the fine particle catalyst, and the fan provides the driving system who retrieves the granule and return the fluidized bed, utilizes the mercury in the oxidation desorption flue gas of discarded denitration catalyst, both can reduce mercury discharge, can make discarded denitration catalyst recycle again, has reduced economic cost, more is favorable to the environmental protection.
Drawings
FIG. 1 is a schematic diagram showing the connection relationship of a device for removing mercury from a coal-fired power plant by oxidation using a waste denitration catalyst;
FIG. 2 is a sectional view of a fluidized bed;
in the figure: 11. the system comprises a flue gas inlet pipe, 12 distribution plates, 13 air holes, 14 catalyst particles, 15 fluidized beds, 16 heat insulation layers, 17 first communication pipes, 18 cyclone separators, 19 first return pipes, 20 second communication pipes, 21 dust collectors, 22 flue gas outlet pipes, 23 ash hoppers, 24 second return pipes, 25 blowers and 26 blast pipes.
Detailed Description
In a first embodiment, referring to fig. 1-2, an apparatus for removing mercury from a coal-fired power plant by oxidation using a waste denitration catalyst comprises a fluidized bed, a cyclone separator, a dust collector and a blower, and is characterized in that:
the fluidized bed be cylindric, be fixed with discoid distribution plate at the inside lower extreme level of fluidized bed, be covered with the gas pocket on the distribution plate, the inside of fluidized bed just is located the distribution plate top and fills there is the catalyst granule, this catalyst granule is dumped denitration catalyst, the lower extreme switch-on of fluidized bed has the flue gas to advance the pipe, the upper end of fluidized bed is through first communicating pipe and cyclone switch-on, cyclone passes through second communicating pipe and dust remover switch-on, the switch-on has the flue gas exit tube on this dust remover.
The lower end of the cyclone separator is communicated with the fluidized bed through a first return pipe, the communicated position of the first return pipe and the fluidized bed is positioned above the distribution plate, and the cyclone separator is mainly used for collecting large-particle catalysts taken away by flue gas.
The blower is connected with a blast pipe, the blast pipe is connected with the first return pipe, and the blower provides power for the catalyst particles to return to the fluidized bed.
The lower end of the dust remover is provided with at least two ash hoppers, each ash hopper is communicated with the blast pipe through a second return pipe, and the dust remover is mainly used for recovering fine particle catalysts taken away by flue gas.
The fluidized bed is made of stainless steel, the fluidized bed is made of 316L-grade stainless steel, the working stability and the service life of the fluidized bed are guaranteed, and the circumferential surface outside the fluidized bed is coated with the heat insulation layer. The distribution plate of this embodiment is made of 2205 grade stainless steel. The pore diameter of the pores in the distribution plate of this example was 25mm, and the aperture ratio of the distribution plate was 30%. The dust remover of the embodiment is an electrostatic dust remover. The blower is a centrifugal fan.
The working process and principle of the invention are as follows:
a device for removing mercury in a coal-fired power plant by using waste denitration catalyst oxidation is characterized in that flue gas enters from a flue gas inlet pipe, elemental mercury in the flue gas enters a fluidized bed along with the flue gas from a distribution plate, reacts with oxygen in the flue gas through the catalytic action of catalyst particles to generate bivalent mercury, the flue gas sequentially passes through a cyclone separator and a dust remover, and is finally discharged from a flue gas outlet pipe, the flue gas containing the bivalent mercury is easily dissolved in water, and is finally removed by spraying slurry in an absorption tower; wherein cyclone and dust remover constitute the recovery system of catalyst granule, wherein cyclone is the mainly used collection large granule catalyst, and the dust remover mainly used retrieves the fine particle catalyst, and the fan provides the driving system who retrieves the granule and return the fluidized bed, utilizes the mercury in the oxidation desorption flue gas of discarded denitration catalyst, both can reduce mercury discharge, can make discarded denitration catalyst recycle again, has reduced economic cost, more is favorable to the environmental protection.
Claims (10)
1. The utility model provides an utilize abandonment denitration catalyst oxidation desorption coal fired power plant mercury device, the device includes fluidized bed, cyclone, dust remover and air-blower, characterized by:
the fluidized bed be cylindric, be fixed with discoid distribution plate at the inside lower extreme level of fluidized bed, be covered with the gas pocket on the distribution plate, the inside of fluidized bed just is located the distribution plate top and fills there is the catalyst granule, this catalyst granule is dumped denitration catalyst, the lower extreme switch-on of fluidized bed has the flue gas to advance the pipe, the upper end of fluidized bed is through first communicating pipe and cyclone switch-on, cyclone passes through second communicating pipe and dust remover switch-on, the switch-on has the flue gas exit tube on this dust remover.
2. The device for removing mercury from a coal-fired power plant by oxidation of the waste denitration catalyst as claimed in claim 1, wherein: the lower end of the cyclone separator is communicated with the fluidized bed through a first return pipe, and the communicated position of the first return pipe and the fluidized bed is positioned above the distribution plate.
3. The device for removing mercury from a coal-fired power plant by using waste denitration catalyst as claimed in claim 2, wherein: the blower is connected with a blast pipe which is connected with a first return pipe.
4. The device for removing mercury from a coal-fired power plant by using waste denitration catalyst as claimed in claim 3, wherein: the lower end of the dust remover is provided with at least two ash hoppers, and each ash hopper is communicated with the blast pipe through a second return pipe.
5. The device for removing mercury from a coal-fired power plant by oxidation of the waste denitration catalyst as claimed in claim 1, wherein: the fluidized bed is made of stainless steel, and the stainless steel is at least 316L-grade stainless steel.
6. The device for removing mercury from a coal-fired power plant by oxidation of the waste denitration catalyst as claimed in claim 1, wherein: the periphery outside the fluidized bed is coated with a heat-insulating layer.
7. The device for removing mercury from a coal-fired power plant by oxidation of the waste denitration catalyst as claimed in claim 1, wherein: the distribution plate is made of stainless steel with at least 2205 grades.
8. The device for removing mercury from a coal-fired power plant by using waste denitration catalyst as claimed in claim 7, wherein: the aperture size of the air holes on the distribution plate is 10mm-100mm, and the aperture ratio of the distribution plate is 30% -45%.
9. The device for removing mercury from a coal-fired power plant by oxidation of the waste denitration catalyst as claimed in claim 1, wherein: the dust remover is an electrostatic dust remover or a bag-type dust remover.
10. The device for removing mercury from a coal-fired power plant by oxidation of the waste denitration catalyst as claimed in claim 1, wherein: the blower is a centrifugal fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911231135.8A CN110882615A (en) | 2019-12-05 | 2019-12-05 | Device for oxidizing and removing mercury in coal-fired power plant by using waste denitration catalyst |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911231135.8A CN110882615A (en) | 2019-12-05 | 2019-12-05 | Device for oxidizing and removing mercury in coal-fired power plant by using waste denitration catalyst |
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| Publication Number | Publication Date |
|---|---|
| CN110882615A true CN110882615A (en) | 2020-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911231135.8A Pending CN110882615A (en) | 2019-12-05 | 2019-12-05 | Device for oxidizing and removing mercury in coal-fired power plant by using waste denitration catalyst |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114733344A (en) * | 2022-05-05 | 2022-07-12 | 中南大学 | Flue gas mercury circulating capture method and system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060228281A1 (en) * | 2002-12-23 | 2006-10-12 | Stroeder Michael | Method and plant for removing gaseous pollutants from exhaust gases |
| US8821818B1 (en) * | 2013-03-15 | 2014-09-02 | Three D Stack, LLC | Cleaning stack gas |
| JP2015104725A (en) * | 2013-12-02 | 2015-06-08 | 三菱日立パワーシステムズ株式会社 | Method for oxidation treatment of metallic mercury in gas by using used denitration catalyst |
| CN106693980A (en) * | 2017-01-05 | 2017-05-24 | 中南大学 | Flue gas mercury oxidation catalyst and application thereof |
| CN211753808U (en) * | 2019-12-05 | 2020-10-27 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Device for oxidizing and removing mercury in coal-fired power plant by using waste denitration catalyst |
-
2019
- 2019-12-05 CN CN201911231135.8A patent/CN110882615A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060228281A1 (en) * | 2002-12-23 | 2006-10-12 | Stroeder Michael | Method and plant for removing gaseous pollutants from exhaust gases |
| US8821818B1 (en) * | 2013-03-15 | 2014-09-02 | Three D Stack, LLC | Cleaning stack gas |
| JP2015104725A (en) * | 2013-12-02 | 2015-06-08 | 三菱日立パワーシステムズ株式会社 | Method for oxidation treatment of metallic mercury in gas by using used denitration catalyst |
| CN106693980A (en) * | 2017-01-05 | 2017-05-24 | 中南大学 | Flue gas mercury oxidation catalyst and application thereof |
| CN211753808U (en) * | 2019-12-05 | 2020-10-27 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Device for oxidizing and removing mercury in coal-fired power plant by using waste denitration catalyst |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114733344A (en) * | 2022-05-05 | 2022-07-12 | 中南大学 | Flue gas mercury circulating capture method and system |
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