CN114682085B - Method for preparing cement kiln synergistic desulfurization and denitrification agent by recycling hazardous waste and solid waste - Google Patents
Method for preparing cement kiln synergistic desulfurization and denitrification agent by recycling hazardous waste and solid waste Download PDFInfo
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 62
- 230000023556 desulfurization Effects 0.000 title claims abstract description 62
- 239000004568 cement Substances 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000002910 solid waste Substances 0.000 title claims abstract description 13
- 239000002920 hazardous waste Substances 0.000 title claims abstract description 12
- 238000004064 recycling Methods 0.000 title claims abstract description 10
- 230000002195 synergetic effect Effects 0.000 title claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 40
- 239000002893 slag Substances 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 19
- 239000002699 waste material Substances 0.000 claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 16
- 239000003054 catalyst Substances 0.000 claims abstract description 15
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 12
- 239000011572 manganese Substances 0.000 claims abstract description 12
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 10
- 239000010881 fly ash Substances 0.000 claims description 7
- 229910000420 cerium oxide Inorganic materials 0.000 claims description 6
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims description 6
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 claims description 4
- 239000005751 Copper oxide Substances 0.000 claims description 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 4
- RCFVMJKOEJFGTM-UHFFFAOYSA-N cerium zirconium Chemical compound [Zr].[Ce] RCFVMJKOEJFGTM-UHFFFAOYSA-N 0.000 claims description 4
- 229910000431 copper oxide Inorganic materials 0.000 claims description 4
- 239000006104 solid solution Substances 0.000 claims description 4
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 claims description 4
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 3
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 45
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 abstract description 20
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 18
- 229910021529 ammonia Inorganic materials 0.000 abstract description 9
- 239000007789 gas Substances 0.000 abstract description 8
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 abstract description 3
- 239000000428 dust Substances 0.000 abstract description 2
- 229910005965 SO 2 Inorganic materials 0.000 description 8
- 230000003197 catalytic effect Effects 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 231100000989 no adverse effect Toxicity 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
- B01D53/83—Solid phase processes with moving reactants
-
- 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
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
- C04B7/42—Active ingredients added before, or during, the burning process
- C04B7/421—Inorganic materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/44—Burning; Melting
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Catalysts (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a method for preparing a cement kiln synergistic desulfurization and denitrification agent by recycling hazardous waste and solid waste, which comprises the following steps: (1) Mixing crushed waste SCR denitration catalyst, electrolytic manganese slag and carbide slag according to a certain mass ratio; (2) coarse grinding the mixed materials; (3) And adding an auxiliary agent into the coarse powder material according to a certain proportion, and carrying out fine powder grinding to obtain the desulfurization and denitrification agent. The invention can realize the synergistic removal of nitrogen oxides and sulfur dioxide in the cement kiln tail gas, meet the emission standard, eliminate the escape ammonia generated by the SNCR system and meet the increasingly strict ammonia escape supervision requirement; the method can treat hazardous waste and solid waste while reducing the desulfurization and denitrification cost, and can recycle resources to create environmental protection value; no additional dust and waste liquid are produced, the operation of the technological process is simple, and no new equipment and occupied area are added.
Description
Technical Field
The invention belongs to the technical field of environmental engineering, and particularly relates to a method for preparing a cement kiln synergistic desulfurization and denitrification agent by recycling hazardous waste and solid waste.
Background
The cement industry is one of the main emission sources of sulfur dioxide and nitrogen oxides, SO 2 And NOx can cause haze, acid rain, photochemical smog, etc., while having an important hazard to human health. In recent years, emission concentration and total amount are controlled with strict standards, and thus, the cement industry is relievedDenitration of sulfur and reaching SO 2 And ultra-low emissions of NOx are the necessary requirements to create a good living environment.
The most widely and mature desulfurization technology in the cement industry at present is limestone-gypsum desulfurization, and the desulfurization efficiency is high by adopting the technology, but the desulfurization system is complex in arrangement, the investment cost is high, and gypsum is easy to block equipment; the double-alkali desulfurization method is adopted, so that the loss of a desulfurization tower can be reduced, the blockage can be avoided, but the absorption liquid is strong in corrosiveness and great in environmental hazard, and the difficulty of subsequent utilization is increased; the ammonia desulfurization method is adopted, the reaction rate is high, the efficiency is high, but ammonia water has high toxicity, potential safety hazards exist in the transportation and use processes, and ammonia can escape. The denitration technology which is commonly adopted and is the most mature in the cement industry is a selective non-catalytic reduction technology (SNCR), the denitration is carried out by adopting the technology, the efficiency is low, the highest denitration efficiency generally only reaches about 70%, and the standard requirements are more and more difficult to meet along with the gradual implementation of ultra-low emission. Thus, there is a need for more efficient techniques for cement kiln denitration.
The electrolytic manganese slag and the waste SCR catalyst contain precious denitration active components and desulfurization catalytic auxiliary components, and if the electrolytic manganese slag and the waste SCR catalyst are used as desulfurization and denitration agents in the cement industry, the desulfurization and denitration can be realized at the same time, the treatment cost of hazardous waste solid waste is reduced, the economic value is created, and the brick is added for the development of the environmental protection industry.
In summary, the existing desulfurization and denitrification technology has the following problems:
(1) The waste SCR denitration catalyst is defined as dangerous waste, and electrolytic slag generated in the electrolytic manganese industry and carbide slag generated in the chemical industry are solid waste, so that the waste SCR denitration catalyst is difficult to treat and has high cost;
(2) The existing desulfurization and denitrification technology has high investment and operation cost and has certain influence on the system;
(3) The gradual implementation of ultralow emission of nitrogen oxides is urgently needed for better desulfurization and denitrification technology.
Disclosure of Invention
Aiming at the problems existing in the prior art, one of the purposes of the invention is to provide a method for preparing cement kiln collaborative desulfurization and denitrification agents by recycling hazardous wastes and solid wastes. The invention can greatly reduce the desulfurization and denitrification cost, treat the escaping ammonia of SNCR, has high desulfurization and denitrification efficiency, can realize the standard emission of nitrogen oxides and sulfur dioxide, has no secondary pollution in the whole process and has no adverse effect on the performance of cement clinker.
The invention discloses a method for preparing a cement kiln collaborative desulfurization and denitrification agent by recycling hazardous waste and solid waste, which comprises the following steps:
(1) Mixing crushed waste SCR denitration catalyst, electrolytic manganese slag and carbide slag according to a certain mass ratio;
(2) Coarse grinding the mixed materials;
(3) And adding an auxiliary agent into the coarse powder material according to a certain proportion, and carrying out fine powder grinding to obtain the desulfurization and denitrification agent.
Preferably, in the step (1), 1-5 parts of the waste SCR denitration catalyst, 1-2 parts of electrolytic manganese slag and 2-10 parts of carbide slag are calculated according to parts by weight.
Preferably, in the step (1), the waste SCR denitration catalyst is crushed into blocks with the size smaller than 100mm by a hammer crusher.
Preferably, in the step (2), the coarse powder is particles with the size smaller than 2mm obtained by grinding the mixed material.
Preferably, in the step (3), the fine powder is obtained by grinding the material after coarse powder into particles with the size smaller than 80 μm.
Preferably, in the step (3), the auxiliary agent is one or a combination of more than one of fly ash, vanadium-titanium slag, red mud, white mud, copper oxide, zirconium oxide, cerium oxide and cerium-zirconium solid solution;
wherein, the mass ratio of each component to the coarse powder grinding material is as follows: 1-5% of fly ash; 0-0.5% of vanadium-titanium slag; 0-0.2% of red mud; 0-1% of white mud; 0-1% of copper oxide; 0-0.5% of zirconia; 0-0.8% of cerium oxide; 0-2% of cerium-zirconium solid solution.
The invention further aims to provide a use method for preparing the cement kiln collaborative desulfurization and denitrification agent by recycling hazardous waste and solid waste, which adopts the following modes:
mixing the desulfurization and denitrification agent with the ground cement raw materials, and adding the cement raw materials mixed with the desulfurization and denitrification agent from a connecting air pipe of a kiln tail C1 cyclone and a kiln tail C2 cyclone after entering a kiln lifter through a chute;
and/or, feeding the desulfurization and denitrification agent into a decomposing furnace through a Roots blower to perform synergistic desulfurization and denitrification;
the addition amount of the desulfurization and denitrification agent accounts for 0.5 per mill-2% of the mass of the raw material.
The first adding mode is as follows: the cement raw material mixed with the desulfurization and denitrification agent and the flue gas move in opposite directions, and gradually decompose under the high-temperature condition along with the increase of the contact gas temperature of the desulfurization and denitrification agent to generate a denitrification catalytic active component, a sulfur dioxide catalytic oxidation active component and the desulfurization agent, and nitrogen oxides in the flue gas react with unreacted escaping ammonia in an SNCR system to generate harmless nitrogen and water, so that deep denitrification is completed; meanwhile, sulfur dioxide in the tail gas is oxidized into sulfur trioxide under the action of the catalytic oxidation active component, and then reacts with the desulfurizing agent rapidly to generate sulfate, and the sulfate enters the kiln head along with the cement raw material. The addition of the auxiliary agent component can promote the oxidation and reaction of sulfides to generate sulfate, thereby ensuring that SO is not increased newly 2 Contaminants, and eventually fix into the clinker. Because the sulfur dioxide concentration is low and is in ppm level, the added desulfurization and denitrification agent is also in trace quantity, and has no adverse effect on cement clinker.
The second adding mode is as follows: after the desulfurization and denitrification agent is sent into a decomposing furnace, the contact high-temperature flue gas is instantaneously decomposed, and the decomposed denitration catalytic active component, sulfur dioxide catalytic oxidation active component and the desulfurization agent enter a kiln tail final-stage cyclone along with the airflow, and then the reaction is the same as the first adding mode, and the repeated description is omitted.
The invention has the advantages and positive effects that:
1) The invention can realize the synergistic removal of nitrogen oxide and sulfur dioxide in the tail gas of the cement kiln, meets the emission standard, and can properly supplement ammonia injection and increase the dosage of the desulfurization and denitrification agent to realize denitrification if the ammonia nitrogen ratio in the tail gas is smaller than 1 or the concentration of the nitrogen oxide is higher.
2) The desulfurization and denitrification agent can dynamically adjust the proportion of the waste denitrification catalyst, the electrolytic manganese slag and the carbide slag according to the concentration ratio of the nitrogen oxide to the sulfur dioxide, so as to realize standard emission of the nitrogen oxide and the sulfur dioxide.
3) The invention can eliminate the escape ammonia generated by the SNCR system and meet the increasingly strict ammonia escape supervision requirement.
4) According to the invention, hazardous waste and solid waste can be treated while the desulfurization and denitrification cost is reduced, and the environmental protection value is created by recycling.
5) The desulfurization and denitrification method has the advantages of no additional generation of dust and waste liquid, simple operation of the technological process, and no new increase of equipment and occupied area.
Drawings
FIG. 1 is a flow chart of desulfurization and denitrification agent added from a connecting air pipe of a C1 cyclone and a C2 cyclone at the tail of a kiln;
fig. 2 is a flow chart of desulfurization and denitrification of adding desulfurization and denitrification agent from a decomposing furnace according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
The background emission concentration of the nitrogen oxide at the C1 outlet is 280 mg/Nm 3 ，SO 2 The background emission concentration was 230 mg/Nm 3 According to the mass ratio of 1:2:2, mixing the waste SCR denitration catalyst (the size of which is smaller than 80mm block) crushed by the hammer stone crusher, electrolytic manganese slag and carbide slag; coarse grinding the mixed materials to particles with the size smaller than 2 mm; adding fly ash accounting for 1% of the mass of the coarse powder and white mud accounting for 0.1% of the mass of the coarse powder into the coarse powder, and grinding the coarse powder into particles with the size of less than 80 mu m to obtain the de-molded productSulfur denitration agent.
As shown in figure 1, the desulfurization and denitrification agent and the cement raw material are mixed according to a ratio of 1:1000, then enter a kiln lifter through a chute, are added from a connecting air pipe of a C1 cyclone cylinder and a C2 cyclone cylinder at the tail of the kiln, realize desulfurization and denitrification, and reduce nitrogen oxides in the tail gas to 60mg/Nm after the addition 3 ，SO 2 Down to 10mg/Nm 3 。
Example 2
The background emission concentration of the nitrogen oxide at the C1 outlet is 260 mg/Nm 3 ，SO 2 The background emission concentration is 350 mg/Nm 3 According to the mass ratio of 2:2:5, mixing the waste SCR denitration catalyst (the size of which is smaller than 100mm block) crushed by the hammer stone crusher, electrolytic manganese slag and carbide slag; coarse grinding the mixed materials to particles with the size smaller than 2 mm; and (3) respectively adding 2% of fly ash and 0.2% of cerium oxide in the coarse powder ground materials, and grinding the materials into particles smaller than 80 mu m to prepare the desulfurization and denitrification agent.
Mixing a desulfurization and denitrification agent with cement raw materials according to a ratio of 2:500, then feeding the mixture into a kiln lifter through a chute, and adding the mixture from a connecting air pipe of a C1 cyclone cylinder and a C2 cyclone cylinder at the tail of the kiln to realize desulfurization and denitrification, wherein nitrogen oxides in tail gas after adding are reduced to 50 mg/Nm 3 ，SO 2 Down to 9 mg/Nm 3 。
Example 3
The background emission concentration of the nitrogen oxide at the C1 outlet is 400 mg/Nm 3 ，SO 2 The background emission concentration was 500 mg/Nm 3 According to the mass ratio of 3:1:5, mixing the waste SCR denitration catalyst (the size of which is smaller than 60mm in block) crushed by the hammer stone crusher, electrolytic manganese slag and carbide slag; coarse grinding the mixed materials to particles with the size smaller than 2 mm; and respectively adding 2% of fly ash, 0.2% of cerium oxide and 0.2% of zirconium oxide into the coarse powder ground materials, and grinding the materials into particles smaller than 80 mu m to prepare the desulfurization and denitrification agent.
As shown in FIG. 2, the desulfurization and denitrification agent accounting for 5 per mill of the mass of the cement raw material is sent into a decomposing furnace through a Roots blower by a metering pump to realize desulfurization and denitrification, and the nitrogen oxide in the tail gas is reduced to 65 mg/Nm after the desulfurization and denitrification agent is added 3 ，SO 2 Down to 12 mg/Nm 3 。
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments may be modified or some or all of the technical features may be replaced equivalently, and these modifications or replacements do not make the essence of the corresponding technical scheme deviate from the scope of the technical scheme of the embodiments of the present invention.
Claims (2)
1. The method for preparing the cement kiln collaborative desulfurization and denitrification agent by recycling hazardous waste and solid waste is characterized by comprising the following steps:
(1) Mixing crushed waste SCR denitration catalyst, electrolytic manganese slag and carbide slag according to a certain mass ratio; 1-5 parts of waste SCR denitration catalyst, 1-2 parts of electrolytic manganese slag and 2-10 parts of carbide slag; crushing the waste SCR denitration catalyst into blocks with the size smaller than 100mm by a hammer crusher;
(2) Coarse grinding the mixed materials; the coarse powder grinding is to grind the mixed material into particles with the size smaller than 2 mm;
(3) Adding an auxiliary agent into the material after the coarse grinding according to a certain proportion, and carrying out fine grinding, wherein the fine grinding is to grind the material after the coarse grinding into particles with the size smaller than 80 mu m, so as to prepare a desulfurization and denitrification agent;
the auxiliary agent is one or a combination of more of fly ash, vanadium-titanium slag, red mud, white mud, copper oxide, zirconium oxide, cerium oxide and cerium-zirconium solid solution;
wherein, the mass ratio of each component to the coarse powder grinding material is as follows: 1-5% of fly ash; 0-0.5% of vanadium-titanium slag; 0-0.2% of red mud; 0-1% of white mud; 0-1% of copper oxide; 0-0.5% of zirconia; 0-0.8% of cerium oxide; 0-2% of cerium-zirconium solid solution.
2. The application method for preparing the cement kiln collaborative desulfurization and denitrification agent by recycling hazardous waste and solid waste is characterized in that the desulfurization and denitrification agent is prepared by adopting the method of claim 1, and the desulfurization and denitrification agent is used in the following way:
mixing the desulfurization and denitrification agent with the ground cement raw materials, and adding the cement raw materials mixed with the desulfurization and denitrification agent from a connecting air pipe of a kiln tail C1 cyclone and a kiln tail C2 cyclone after entering a kiln lifter through a chute;
and/or, feeding the desulfurization and denitrification agent into a decomposing furnace through a Roots blower to perform synergistic desulfurization and denitrification;
the addition amount of the desulfurization and denitrification agent accounts for 0.5 per mill-2% of the mass of the raw material.
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| CN115445411A (en) * | 2022-07-07 | 2022-12-09 | 南京永能新材料有限公司 | Solid waste powder desulfurizer for cement kiln and preparation method thereof |
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