CN112844028A - Industrial kiln flue gas denitration agent and preparation method and application thereof - Google Patents
Industrial kiln flue gas denitration agent and preparation method and application thereof Download PDFInfo
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- CN112844028A CN112844028A CN202110215848.6A CN202110215848A CN112844028A CN 112844028 A CN112844028 A CN 112844028A CN 202110215848 A CN202110215848 A CN 202110215848A CN 112844028 A CN112844028 A CN 112844028A
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- flue gas
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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
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
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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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- 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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- 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
Abstract
The invention discloses an industrial kiln flue gas denitration agent, which comprises the following raw materials in parts by weight: 40-70 parts of urea, 15-30 parts of activated carbon, 2-5 parts of vanadium pentoxide, 10-15 parts of graphene, 3-8 parts of potassium chlorate, 6-15 parts of potassium triallate ferrite, 1-5 parts of tannin extract, 1-3 parts of neodymium nitrate, 2-3 parts of lanthanum nitrate, 20-30 parts of bentonite, 10-20 parts of quicklime and 5-15 parts of talcum powder. Meanwhile, the invention also discloses a preparation method of the denitration agent and application of the denitration agent in wet denitration. The denitration agent has high denitration efficiency, can be used for wet desulphurization, can fully contact with flue gas to react, obviously reduces the content of nitrogen oxide, ensures that the flue gas meets the national emission standard after desulphurization, and has wide practicability.
Description
Technical Field
The invention belongs to the technical field of flue gas denitration, and particularly relates to an industrial kiln flue gas denitration agent, and a preparation method and application thereof.
Background
At present, SCR (selective catalytic reduction) technology and SNCR (selective non-catalytic reduction) technology are mostly adopted for flue gas denitration, the SCR technology has high investment, the catalyst is easy to block,Poisoning and abrasion; the SNCR technology has high requirement on the position sprayed with ammonia water, often causes the degree of chemical reaction to be lower, and causes nitrogen oxide NOXThe reduction rate was unstable. Meanwhile, dry process technology is mostly adopted for flue gas denitration at present, the dry process technology can cause a great deal of waste of the denitration agent, and because the denitration effect is poor, a great deal of denitration agent powder is sprayed, so that the escape degree of ammonia is increased, secondary pollution is caused to air, and the production cost is increased; in addition, the dry denitration has high requirements on equipment, is only suitable for removing the discharged flue gas in a certain specific occasion, has more influence factors and unstable removal effect, and causes the use of the denitration agent to have limitation.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an industrial kiln flue gas denitration agent, and also provides a preparation method and application of the denitration agent.
An industrial kiln flue gas denitration agent comprises the following raw materials in parts by weight:
40-70 parts of urea, 15-30 parts of activated carbon, 2-5 parts of vanadium pentoxide, 10-15 parts of graphene, 3-8 parts of potassium chlorate, 6-15 parts of potassium triallate ferrite, 1-5 parts of tannin extract, 1-3 parts of neodymium nitrate, 2-3 parts of lanthanum nitrate, 20-30 parts of bentonite, 10-20 parts of quicklime and 5-15 parts of talcum powder.
Preferably, the industrial kiln flue gas denitration agent comprises the following raw materials in parts by weight:
40-70 parts of urea, 20-30 parts of activated carbon, 2-3 parts of vanadium pentoxide, 10-15 parts of graphene, 3-5 parts of potassium chlorate, 6-12 parts of potassium triallate ferrite, 1-3 parts of tannin extract, 1-2 parts of neodymium nitrate, 2-3 parts of lanthanum nitrate, 20-25 parts of bentonite, 10-20 parts of quicklime and 5-15 parts of talcum powder.
Preferably, the industrial kiln flue gas denitration agent comprises the following raw materials in parts by weight:
50-60 parts of urea, 15-20 parts of activated carbon, 2-5 parts of vanadium pentoxide, 10-15 parts of graphene, 5-8 parts of potassium chlorate, 8-15 parts of potassium triallate ferrite, 1-5 parts of tannin extract, 2-3 parts of neodymium nitrate, 2-3 parts of lanthanum nitrate, 20-30 parts of bentonite, 10-20 parts of quicklime and 10-15 parts of talcum powder.
Preferably, the industrial kiln flue gas denitration agent comprises the following raw materials in parts by weight:
50-60 parts of urea, 15-20 parts of activated carbon, 2-5 parts of vanadium pentoxide, 10-15 parts of graphene, 5-8 parts of potassium chlorate, 8-15 parts of potassium triallate ferrite, 3-5 parts of tannin extract, 2-3 parts of neodymium nitrate, 2-3 parts of lanthanum nitrate, 20-30 parts of bentonite, 10-20 parts of quicklime and 10-15 parts of talcum powder.
Preferably, the industrial kiln flue gas denitration agent comprises the following raw materials in parts by weight:
50-60 parts of urea, 15-20 parts of activated carbon, 2-5 parts of vanadium pentoxide, 10-15 parts of graphene, 5-8 parts of potassium chlorate, 8-15 parts of potassium triallate ferrite, 1-3 parts of tannin extract, 2-3 parts of neodymium nitrate, 2-3 parts of lanthanum nitrate, 20-30 parts of bentonite, 10-20 parts of quicklime and 10-15 parts of talcum powder.
Preferably, the preparation method of the industrial kiln flue gas denitration agent comprises the following steps:
(1) stirring and mixing the raw materials;
(2) and (2) performing ball milling and screening on the mixture obtained in the step (1), and ensuring the particle size of the screened particles to be 200-300 mu m.
In the step (1), the stirring is magnetic stirring for 30-50 min.
The application of the industrial kiln flue gas denitration agent in flue gas denitration is wet denitration, and specifically comprises the following steps:
(1) dissolving the denitration agent by using desalted water to form a mixed solution;
(2) and atomizing the mixed solution, and then introducing into flue gas.
Preferably, the concentration of the denitration agent in the mixed solution is 12-15 wt%.
Preferably, the atomization in the step (2) is fog drops atomized to 15-40 μm, and the introduction speed of the smoke is 1.0m3/h-1.2 m3/h。
The invention has the advantages that:
(1) the denitration agent provided by the invention has high denitration efficiency, can be used for wet desulphurization, can be fully contacted with flue gas to react, and obviously reduces the content of nitrogen oxides, and the flue gas meets the national emission standard after desulphurization.
(2) The denitration agent provided by the invention has the advantages that the spraying amount and the spraying position can be flexibly adjusted during wet denitration, the requirement on equipment is low, the applicability is wide, the removal of harmful gases in flue gas discharged by industrial kilns such as cement kilns, power plants and coal-fired boilers can be met, and the removal effect is good.
Detailed Description
Example 1
An industrial kiln flue gas denitration agent comprises the following raw materials in parts by weight:
70 parts of urea, 15 parts of activated carbon, 5 parts of vanadium pentoxide, 10 parts of graphene, 3 parts of potassium chlorate, 15 parts of potassium trimodate ferrite, 1 part of tannin extract, 1 part of neodymium nitrate, 2 parts of lanthanum nitrate, 24 parts of bentonite, 10 parts of quicklime and 9 parts of talcum powder;
the preparation method of the industrial kiln flue gas denitration agent comprises the following steps:
(1) magnetically stirring the raw materials for 30min, and mixing;
(2) and (2) performing ball milling and screening on the mixture obtained in the step (1), and ensuring the particle size of the screened particles to be 200-300 mu m.
Example 2
An industrial kiln flue gas denitration agent comprises the following raw materials in parts by weight:
65 parts of urea, 15 parts of activated carbon, 5 parts of vanadium pentoxide, 10 parts of graphene, 3 parts of potassium chlorate, 15 parts of potassium trimodate ferrite, 5 parts of tannin extract, 1 part of neodymium nitrate, 2 parts of lanthanum nitrate, 29 parts of bentonite, 10 parts of quicklime and 5 parts of talcum powder;
the preparation method of the industrial kiln flue gas denitration agent comprises the following steps:
(1) magnetically stirring the raw materials for 50min, and mixing;
(2) and (2) performing ball milling and screening on the mixture obtained in the step (1), and ensuring the particle size of the screened particles to be 200-300 mu m.
Example 3
An industrial kiln flue gas denitration agent comprises the following raw materials in parts by weight:
40 parts of urea, 30 parts of activated carbon, 3 parts of vanadium pentoxide, 15 parts of graphene, 5 parts of potassium chlorate, 6 parts of potassium trimodate ferrite, 3 parts of tannin extract, 2 parts of neodymium nitrate, 3 parts of lanthanum nitrate, 23 parts of bentonite, 20 parts of quicklime and 15 parts of talcum powder;
the preparation method of the industrial kiln flue gas denitration agent comprises the following steps:
(1) magnetically stirring the raw materials for 40min, and mixing;
(2) and (2) performing ball milling and screening on the mixture obtained in the step (1), and ensuring the particle size of the screened particles to be 200-300 mu m.
Example 4
An industrial kiln flue gas denitration agent comprises the following raw materials in parts by weight:
50 parts of urea, 20 parts of activated carbon, 2 parts of vanadium pentoxide, 10 parts of graphene, 8 parts of potassium chlorate, 11 parts of potassium trimodate ferrite, 3 parts of tannin extract, 3 parts of neodymium nitrate, 3 parts of lanthanum nitrate, 30 parts of bentonite, 10 parts of quicklime and 15 parts of talcum powder;
the preparation method of the industrial kiln flue gas denitration agent is the same as that in example 3.
Example 5
An industrial kiln flue gas denitration agent comprises the following raw materials in parts by weight:
55 parts of urea, 17 parts of activated carbon, 4 parts of vanadium pentoxide, 13 parts of graphene, 7 parts of potassium chlorate, 8 parts of potassium trimodate ferrite, 5 parts of tannin extract, 2 parts of neodymium nitrate, 2 parts of lanthanum nitrate, 25 parts of bentonite, 15 parts of quicklime and 12 parts of talcum powder;
the preparation method of the industrial kiln flue gas denitration agent is the same as that in example 3.
Example 6
An industrial kiln flue gas denitration agent comprises the following raw materials in parts by weight:
60 parts of urea, 15 parts of activated carbon, 5 parts of vanadium pentoxide, 10 parts of graphene, 5 parts of potassium chlorate, 14 parts of potassium trimodate ferrite, 2 parts of tannin extract, 2 parts of neodymium nitrate, 2 parts of lanthanum nitrate, 20 parts of bentonite, 20 parts of quicklime and 10 parts of talcum powder;
the preparation method of the industrial kiln flue gas denitration agent is the same as that in example 3.
Comparative examples 1 to 3 were set up for example 6, with the exception that no potassium trimalate and no tannin extract were added, respectively, as in example 6.
Comparative example 1
An industrial kiln flue gas denitration agent comprises the following raw materials in parts by weight:
60 parts of urea, 15 parts of activated carbon, 5 parts of vanadium pentoxide, 10 parts of graphene, 5 parts of potassium chlorate, 2 parts of neodymium nitrate, 2 parts of lanthanum nitrate, 20 parts of bentonite, 20 parts of quicklime and 10 parts of talcum powder.
Comparative example 2
An industrial kiln flue gas denitration agent comprises the following raw materials in parts by weight:
60 parts of urea, 15 parts of activated carbon, 5 parts of vanadium pentoxide, 10 parts of graphene, 5 parts of potassium chlorate, 2 parts of tannin extract, 2 parts of neodymium nitrate, 2 parts of lanthanum nitrate, 20 parts of bentonite, 20 parts of quicklime and 10 parts of talcum powder.
Comparative example 3
An industrial kiln flue gas denitration agent comprises the following raw materials in parts by weight:
60 parts of urea, 15 parts of activated carbon, 5 parts of vanadium pentoxide, 10 parts of graphene, 5 parts of potassium chlorate, 14 parts of potassium trimodate ferrite, 2 parts of neodymium nitrate, 2 parts of lanthanum nitrate, 20 parts of bentonite, 20 parts of quicklime and 10 parts of talcum powder.
Example 7
The denitration agent provided by the invention can be used for wet denitration, and specifically comprises the following components:
(1) dissolving the denitrifier with demineralized water to form a mixed solution, wherein the concentration of the denitrifier in the mixed solution is 12-15 wt%;
(2) atomizing the mixed solution to fog drops of 15-40 μm, and then spraying the mixed solution at a speed of 1.0m3/h-1.2 m3The velocity/h is introduced into the flue gas.
Effect detection
1. The content of nitrogen oxide in the smoke of a certain cement kiln is 850 mg/m3By adopting the application method described in embodiment 7, the flue gas denitration agent provided by the invention is applied to wet denitration; specific reaction conditions andthe results are shown in Table 1, and the other reaction conditions were the same.
TABLE 1 reaction conditions and results
2. The content of nitrogen oxide in the flue gas of a kiln of a certain power plant is 450 mg/m3By adopting the application method described in embodiment 7, the flue gas denitration agent provided by the invention is applied to wet denitration; the specific reaction conditions and results are shown in Table 2, and other reaction conditions are the same.
TABLE 2 reaction conditions and results
3. The content of nitrogen oxide in the smoke of a certain coal-fired boiler is 530 mg/m3By adopting the application method described in embodiment 7, the flue gas denitration agent provided by the invention is applied to wet denitration; the specific reaction conditions and results are shown in Table 3, and other reaction conditions are the same.
TABLE 3 reaction conditions and results
As can be seen from tables 1 to 3, the denitration agent provided by the invention has good denitration effect when being used for wet denitration.
Claims (10)
1. The utility model provides an industrial kiln flue gas denitration agent which characterized in that: the feed comprises the following raw materials in parts by weight:
40-70 parts of urea, 15-30 parts of activated carbon, 2-5 parts of vanadium pentoxide, 10-15 parts of graphene, 3-8 parts of potassium chlorate, 6-15 parts of potassium triallate ferrite, 1-5 parts of tannin extract, 1-3 parts of neodymium nitrate, 2-3 parts of lanthanum nitrate, 20-30 parts of bentonite, 10-20 parts of quicklime and 5-15 parts of talcum powder.
2. The industrial kiln flue gas denitration agent according to claim 1, which is characterized in that: the feed comprises the following raw materials in parts by weight:
40-70 parts of urea, 20-30 parts of activated carbon, 2-3 parts of vanadium pentoxide, 10-15 parts of graphene, 3-5 parts of potassium chlorate, 6-12 parts of potassium triallate ferrite, 1-3 parts of tannin extract, 1-2 parts of neodymium nitrate, 2-3 parts of lanthanum nitrate, 20-25 parts of bentonite, 10-20 parts of quicklime and 5-15 parts of talcum powder.
3. The industrial kiln flue gas denitration agent according to claim 1, which is characterized in that: the feed comprises the following raw materials in parts by weight:
50-60 parts of urea, 15-20 parts of activated carbon, 2-5 parts of vanadium pentoxide, 10-15 parts of graphene, 5-8 parts of potassium chlorate, 8-15 parts of potassium triallate ferrite, 1-5 parts of tannin extract, 2-3 parts of neodymium nitrate, 2-3 parts of lanthanum nitrate, 20-30 parts of bentonite, 10-20 parts of quicklime and 10-15 parts of talcum powder.
4. The industrial kiln flue gas denitration agent according to claim 3, which is characterized in that: the feed comprises the following raw materials in parts by weight:
50-60 parts of urea, 15-20 parts of activated carbon, 2-5 parts of vanadium pentoxide, 10-15 parts of graphene, 5-8 parts of potassium chlorate, 8-15 parts of potassium triallate ferrite, 3-5 parts of tannin extract, 2-3 parts of neodymium nitrate, 2-3 parts of lanthanum nitrate, 20-30 parts of bentonite, 10-20 parts of quicklime and 10-15 parts of talcum powder.
5. The industrial kiln flue gas denitration agent according to claim 3, which is characterized in that: the feed comprises the following raw materials in parts by weight:
50-60 parts of urea, 15-20 parts of activated carbon, 2-5 parts of vanadium pentoxide, 10-15 parts of graphene, 5-8 parts of potassium chlorate, 8-15 parts of potassium triallate ferrite, 1-3 parts of tannin extract, 2-3 parts of neodymium nitrate, 2-3 parts of lanthanum nitrate, 20-30 parts of bentonite, 10-20 parts of quicklime and 10-15 parts of talcum powder.
6. The method for preparing the industrial kiln flue gas denitration agent as claimed in any one of claims 1 to 5, characterized in that: the method comprises the following steps:
(1) stirring and mixing the raw materials;
(2) and (2) performing ball milling and screening on the mixture obtained in the step (1), and ensuring the particle size of the screened particles to be 200-300 mu m.
7. The preparation method of the industrial kiln flue gas denitration agent according to claim 6, which is characterized by comprising the following steps: in the step (1), the stirring is magnetic stirring for 30-50 min.
8. The application of the industrial kiln flue gas denitration agent disclosed by any one of claims 1 to 5 in flue gas denitration is characterized in that: the application is wet denitration, and specifically comprises the following steps:
(1) dissolving the denitration agent by using desalted water to form a mixed solution;
(2) and atomizing the mixed solution, and then introducing into flue gas.
9. The application of the industrial kiln flue gas denitration agent in flue gas denitration according to claim 8 is characterized in that: the concentration of the denitrifier in the mixed solution is 12-15 wt%.
10. The application of the industrial kiln flue gas denitration agent in flue gas denitration according to claim 9 is characterized in that: in the step (2), the atomization is fog drops atomized to 15-40 mu m, and the introduction speed of the smoke is 1.0m3/h-1.2 m3/h。
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