CN114682065A - Denitration agent for intelligent active amino reduction denitration and method for denitration of kiln tail flue gas - Google Patents
Denitration agent for intelligent active amino reduction denitration and method for denitration of kiln tail flue gas Download PDFInfo
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- 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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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B01D53/34—Chemical or biological purification of waste gases
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B01D53/34—Chemical or biological purification of waste gases
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- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention relates to the technical field of flue gas denitration, in particular to a denitration agent for intelligent active amino reduction denitration and a method for denitration of kiln tail flue gas. The denitration agent comprises an amino dry powder denitration agent and an amino liquid denitration agent which are independently packaged, wherein the amino dry powder denitration agent comprises, by mass, 45-57% of fly ash, 18-30% of melamine, 10-20% of calcium carbonate, 5-14% of calcium formate and 1-3.5% of iron oxide; the amino liquid denitration agent comprises, by mass, 2-5% of melamine, 3-15% of urotropine, 2-10% of diammonium hydrogen phosphate and 75-80% of water; the pH value of the amino liquid denitration agent is 8-10. According to the invention, through the combined use of the amino dry powder denitration agent and the amino liquid denitration agent, the SNCR denitration has a wider temperature window interval, and the denitration efficiency is improved.
Description
Technical Field
The invention relates to the technical field of flue gas denitration, in particular to a denitration agent for intelligent active amino reduction denitration and a method for denitration of kiln tail flue gas.
Background
In recent years, with the acceleration of modern production and the improvement of living standard, the problem of environmental pollution gradually receives social attention. As the cement industry is used as a national nitrogen oxide emission consumer, with the gradual rise of the cement demand and the yield in China, the emission of the nitrogen oxide generated in the production process becomes the third place after the vitality power generation and the automobile exhaust, the nitrogen oxide not only can cause great damage to the environment, but also can harm the health and life safety of human beings, and therefore, the best feasible denitration treatment technology of the cement industry is found, and the problem of controlling the emission of the nitrogen oxide is solved.
At present, the method adopted by the flue gas denitration in the cement industry mainly adopts Selective Catalytic Reduction (SCR), selective non-catalytic reduction (SNCR) and forced oxidation-absorption reduction (FO-AR) technologies; the Selective Catalytic Reduction (SCR) technology adopts a method of denitration after a furnace, ammonia water is sprayed into anhydrous flue gas at the temperature of 160-400 ℃ under the participation of a catalyst, and the anhydrous flue gas selectively reacts with nitrogen oxides, so that the SCR denitration efficiency is high, the technology is mature and reliable, but the investment cost is high, the operation cost is high, the catalyst is easy to be poisoned, and the like, and the SCR denitration technology is difficult to be applied to denitration engineering of small and medium-sized enterprises. The selective non-catalytic reduction (SNCR) technology is characterized in that a reducing agent is sprayed into a furnace cavity at a high temperature of 850-1100 ℃ without participation of a catalyst, so that nitrogen oxides in flue gas are reduced and removed, the SNCR does not need to use the catalyst, and the reducing agent used in the reaction is relatively flexible to select.
Disclosure of Invention
The invention aims to provide a denitration agent for intelligent active amino reduction denitration and a method for denitration of kiln tail flue gas, wherein the denitration agent has higher denitration efficiency.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a denitration agent for intelligent active amino reduction denitration, which comprises an amino dry powder denitration agent and an amino liquid denitration agent which are independently packaged;
the amino dry powder denitration agent comprises, by mass, 45-57% of fly ash, 18-30% of melamine, 10-20% of calcium carbonate, 5-14% of calcium formate and 1-3.5% of ferric oxide;
the amino liquid denitration agent comprises, by mass, 2-5% of melamine, 3-15% of urotropine, 2-10% of diammonium hydrogen phosphate and 75-80% of water; the pH value of the amino liquid denitration agent is 8-10.
Preferably, the composite material also comprises an independently-packaged inorganic mineralizer;
the particle size of the inorganic mineralizer is 100-200 meshes.
Preferably, the inorganic mineralizer includes clay and calcium carbonate;
the mass ratio of the clay to the calcium carbonate is 3: 2.
Preferably, the pH of the amino liquid denitration agent is adjusted by ammonia water with a mass concentration of 20%.
The invention also provides a method for denitration of kiln tail flue gas, which comprises the following steps:
the method is carried out in an intelligent active amino reduction denitration device, and a decomposing furnace of the intelligent active amino reduction denitration device comprises an upper part, a lower part and a gooseneck region from top to bottom in sequence; an amino liquid denitration agent adding point is arranged at the upper part of the decomposing furnace; the gooseneck region is provided with an amino dry powder denitration agent adding point;
and (3) introducing the flue gas of the kiln tail smoke chamber into a decomposing furnace, adding an amino liquid denitration agent at the adding point of the amino liquid denitration agent, and adding an amino dry powder denitration agent at the adding point of the amino dry powder denitration agent to perform denitration.
Preferably, the addition rate ratio of the amino dry powder denitration agent to the amino liquid denitration agent is (2-3) to 1;
the ratio of the introduction rate of the flue gas to the addition rate of the amino dry powder denitration agent is (1-3) to (1-3).
Preferably, a gooseneck area of the decomposing furnace is provided with an inorganic mineralizer adding point;
the height of the addition point of the inorganic mineralizer is the same as that of the addition point of the amino dry powder denitration agent.
Preferably, an inorganic mineralizer is added at the point of addition of the inorganic mineralizer;
the adding time of the inorganic mineralizer and the amino dry powder denitration agent is the same.
Preferably, the adding rate ratio of the inorganic mineralizer to the amino dry powder denitration agent is 1: 1.
Preferably, the intelligent active amino reduction denitration device further comprises a C4-stage preheater and a C5-stage preheater;
the denitrated flue gas sequentially passes through a C5-level preheater and a C4-level preheater; and the C5-stage preheater and the C4-stage preheater respectively supply air to the kiln tail smoke chamber and the decomposing furnace through air duct outlets.
The invention provides a denitration agent for intelligent active amino reduction denitration, which comprises an amino dry powder denitration agent and an amino liquid denitration agent which are independently packaged, wherein the amino dry powder denitration agent comprises, by mass, 45-57% of fly ash, 18-30% of melamine, 10-20% of calcium carbonate, 5-14% of calcium formate and 1-3.5% of iron oxide; the amino liquid denitration agent comprises, by mass, 2-5% of melamine, 3-15% of urotropine, 2-10% of diammonium hydrogen phosphate and 75-80% of water; the pH value of the amino liquid denitration agent is 8-10. According to the invention, through the combined use of the amino dry powder denitration agent and the amino liquid denitration agent, the SNCR denitration has a wider temperature window interval, and the denitration efficiency is improved.
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FIG. 1 is a schematic structural diagram of an apparatus for intelligent active amino reduction denitration according to an embodiment of the present invention;
1: stage C4 preheater, 2: stage C5 preheater, 3: amino liquid denitrifier injection point, 4: decomposing furnace, 5: inorganic mineralizer addition point, 6: motor, 7: kiln tail smoke chamber, 8: and adding a point of the amino dry powder denitration agent.
Detailed Description
The invention also provides a denitration agent for intelligent active amino reduction denitration, which comprises an amino dry powder denitration agent and an amino liquid denitration agent which are independently packaged;
the amino dry powder denitration agent comprises, by mass, 45-57% of fly ash, 18-30% of melamine, 10-20% of calcium carbonate, 5-14% of calcium formate and 1-3.5% of ferric oxide;
the amino liquid denitration agent comprises, by mass, 2-5% of melamine, 3-15% of urotropine, 2-10% of diammonium hydrogen phosphate and 75-80% of water; the pH value of the amino liquid denitration agent is 8-10.
In the invention, the fly ash in the amino dry powder denitration agent is preferably secondary off-white; the iron oxide is preferably red iron oxide or yellow iron oxide.
In the present invention, the pH of the amino liquid denitration agent is preferably adjusted by ammonia water having a mass concentration of 20%.
In the present invention, the denitration agent further preferably includes an inorganic mineralizer, and the inorganic mineralizer preferably includes clay and calcium carbonate; the mass ratio of the clay to the calcium carbonate is preferably 3: 2; the particle size of the inorganic mineralizer is preferably 100-200 meshes; in the present invention, the composition of the clay includes iron sesquioxide, silica and calcium oxide; the mass ratio of the ferric oxide to the silicon dioxide to the calcium oxide is preferably (1-1.5): (2-2.5): 1-1.2, and more preferably 1:2:1
The preparation method of the amino dry powder denitration agent, the amino liquid denitration agent and the inorganic mineralizer is not limited by any particular method, and the preparation method can be carried out by adopting a mixing process well known to those skilled in the art.
The invention also provides a method for denitration of kiln tail flue gas, which comprises the following steps:
the method is carried out in an intelligent active amino reduction denitration device, and a decomposition furnace of the intelligent active amino reduction denitration device comprises an upper part, a lower part and a gooseneck region from top to bottom in sequence; an amino liquid denitrifying agent adding point is arranged at the upper part of the decomposing furnace; the gooseneck region is provided with an amino dry powder denitration agent adding point;
and (3) introducing the flue gas of the kiln tail smoke chamber into a decomposing furnace, adding an amino liquid denitration agent at the adding point of the amino liquid denitration agent, and adding an amino dry powder denitration agent at the adding point of the amino dry powder denitration agent to perform denitration.
As shown in fig. 1, in the present invention, the intelligent active amino-reduction denitration apparatus further preferably comprises a kiln tail gas chamber, a C4-stage preheater and a C5-stage preheater;
the kiln tail smoke chamber is connected with the bottom of the gooseneck region; the upper part is connected with a C5-stage preheater and a C4-stage preheater flue in sequence;
the C5 stage preheater is connected with the kiln tail smoke chamber air duct; the C4 stage preheater is connected with the lower air duct of the decomposing furnace.
In the present invention, the bottom of the gooseneck region preferably comprises a combustion zone; the combustion zone is preferably located 26-28 m away from the top of the gooseneck; the height of the amino dry powder denitration agent addition point is preferably 3-4 m higher than that of the combustion zone.
In the invention, the temperature of the combustion zone is preferably 795-850 ℃.
In the present invention, the combustion zone functions to allow the formation of a dry product by heating the pulverized coal.
In the present invention, the C5 stage preheater preferably includes a flue outlet and a duct outlet; the temperature of the flue outlet is preferably 885-915 ℃, and the temperature of the air flue outlet is preferably 850-875 ℃.
In the present invention, the C5 stage preheater is of a cone structure; and an amino liquid denitration agent adding point is also arranged at the bottom of the cone structure. In the invention, the addition point of the amino liquid denitrifying agent can replace the function of the original liquid ammonia gas.
In the present invention, the apparatus also preferably includes a motor which functions to provide power for conveying the material.
In the invention, the number of the amino liquid denitration agent adding points of the decomposing furnace is 4-6.
As a specific embodiment of the present invention, the apparatus is further connected with an intelligent component, and the intelligent component intelligently controls each component in the apparatus.
In the invention, the addition rate ratio of the amino dry powder denitration agent to the amino liquid denitration agent is preferably (2-3) to 1, more preferably 2: 1; the ratio of the introduction rate of the flue gas to the addition rate of the amino dry powder denitration agent is preferably (1-3) to (1-3), and more preferably 2:1
In the present invention, the method preferably further comprises adding an amino liquid denitrifier at the addition point of the amino liquid denitrifier in the C5-stage preheater to perform further denitration;
in the invention, the gooseneck region is also preferably provided with an inorganic mineralizer addition point; the height of the inorganic mineralizer addition point is equal to that of the amino dry powder denitration agent addition point. In the invention, the number of the inorganic mineralizer addition points is 1; the number of the addition points of the amino dry powder denitration agent is 2.
In the present invention, the inorganic mineralizer is preferably added at the addition point of the inorganic mineralizer in the decomposition furnace.
In the present invention, the inorganic mineralizer preferably includes clay and calcium carbonate; the mass ratio of the clay to the calcium carbonate is preferably 3: 2; the particle size of the inorganic mineralizer is preferably 100-200 meshes; in the present invention, the composition of the clay includes iron sesquioxide, silica and calcium oxide; the particle size of the viscosity is preferably 80-100 meshes.
In the invention, the addition rate ratio of the inorganic mineralizer to the amino dry powder denitration agent is preferably 1: 1.
In the invention, the addition point of the inorganic mineralizer and the amino dry powder denitration agent are arranged, so that the denitration efficiency can be further improved.
In the method, the addition of the amino liquid denitration agent, the amino dry powder denitration agent and the inorganic mineralizer is preferably controlled by an intelligent assembly to predict, analyze and judge the smoke of the smoke and only determine the addition rate of the amino liquid denitration agent, the amino dry powder denitration agent and the inorganic mineralizer.
In the invention, denitrated flue gas passes through a C5-level preheater and a C4-level preheater in sequence; and the C5-stage preheater and the C4-stage preheater respectively supply air to the kiln tail smoke chamber and the decomposing furnace through air duct outlets.
The denitration agent for intelligent active amino reduction denitration and the method for denitration of kiln tail flue gas provided by the invention are described in detail below with reference to examples, but the invention is not to be construed as limiting the scope of the invention.
Example 1
Amino dry powder denitrifying agent: 60kg of secondary off-white fly ash, 32kg of melamine, 20kg of calcium carbonate, 10kg of calcium formate and 3kg of iron oxide yellow; the preparation method comprises the steps of stirring the secondary off-white fly ash, melamine, calcium carbonate, calcium formate and iron oxide yellow until the mixture is uniformly mixed;
amino liquid denitrifying agent (pH 8-10): 5kg of melamine, 16kg of urotropine, 8kg of diammonium phosphate, 20kg of ammonia water with the mass concentration of 20% and 160kg of water; the preparation method comprises mixing melamine, urotropine, diammonium hydrogen phosphate, ammonia water and water;
inorganic mineralizer: a mixture of ultrafine clay and calcium carbonate in a mass ratio of 3: 2; the preparation method comprises the steps of mixing the superfine clay and the calcium carbonate and grinding the mixture to 100-200 meshes;
the method comprises the following steps:
according to NO in kiln tail flue gasxThe content is 698mg/Nm3Calculating, namely introducing the kiln tail flue gas into a decomposition furnace, adding an amino dry powder denitration agent (the addition amount is 65kg/h) at an amino dry powder denitration agent addition point, adding an inorganic mineralizer (the addition amount is 5kg/h) at an inorganic mineralizer addition point, and performing denitration (the denitration efficiency in the gooseneck region can reach 58-62%);
NO at the bottom of the cone of the C5 stage preheaterxThe content is 698mg/Nm3Calculating, namely adding an amino liquid denitration agent (the addition amount is 75kg/h) at the addition point of the amino liquid denitration agent for denitration (the denitration efficiency is 28-30%), and sequentially preheating the denitrated flue gas by C5 stagesAnd a C4 stage preheater, stack-discharged flue gas (NO)xThe content is 82mg/Nm3)。
Example 2
Amino dry powder denitration agent: 33kg of secondary off-white fly ash, 17kg of melamine, 9kg of calcium carbonate, 9.6kg of calcium formate and 2.2kg of iron oxide yellow; the preparation method comprises the steps of stirring the secondary off-white fly ash, melamine, calcium carbonate, calcium formate and iron oxide yellow until the mixture is uniformly mixed;
amino liquid denitrifying agent (pH 8-10): 4.3kg of melamine, 7.8kg of urotropine, 6.8kg of diammonium hydrogen phosphate, 22kg of ammonia water with the mass concentration of 20% and 168kg of water; the preparation method comprises mixing melamine, urotropine, diammonium hydrogen phosphate, ammonia water and water;
inorganic mineralizer: a mixture of ultrafine clay and calcium carbonate in a mass ratio of 3: 2; the preparation method comprises the steps of mixing the superfine clay and the calcium carbonate and grinding the mixture to 100-200 meshes;
the method comprises the following steps:
according to NO in kiln tail flue gasxThe content is 713mg/Nm3Calculating, namely introducing the kiln tail flue gas into a decomposition furnace, adding an amino dry powder denitration agent (the addition amount is 40kg/h) at an amino dry powder denitration agent addition point, adding an inorganic mineralizer (the addition amount is 3kg/h) at an inorganic mineralizer addition point, and performing denitration (the denitration efficiency in the gooseneck region can reach 63.7%);
NO at the bottom of cone of the C5 stage preheaterxThe content is 221mg/Nm3The calculation is carried out in such a way that,
adding an amino liquid denitration agent (the addition amount is 50g/h) at the addition point of the amino liquid denitration agent for denitration (the denitration efficiency is 31-35%), sequentially passing the denitrated flue gas through a C5-level preheater and a C4-level preheater, and discharging the flue gas (NO) through a chimneyxThe content is 78mg/Nm3)。
Example 3
Amino dry powder denitration agent: 73.3kg of secondary off-white fly ash, 23.9kg of melamine, 19.5kg of calcium carbonate, 10.14kg of calcium formate and 2.4kg of iron oxide yellow; the preparation method comprises the steps of stirring the secondary off-white fly ash, melamine, calcium carbonate, calcium formate and iron oxide yellow until the mixture is uniformly mixed;
amino liquid denitrifying agent (pH 8-10): 9.36kg of melamine, 17.16kg of urotropine, 6.24kg of diammonium hydrogen phosphate, 26kg of ammonia water with the mass concentration of 20% and 175kg of water; the preparation method comprises mixing melamine, urotropine, diammonium hydrogen phosphate, ammonia water and water;
inorganic mineralizer: a mixture of ultrafine clay and calcium carbonate in a mass ratio of 3: 2; the preparation method comprises the steps of mixing the superfine clay and the calcium carbonate and grinding the mixture to 100-200 meshes;
the method comprises the following steps:
according to NO in kiln tail flue gasxThe content is 730mg/Nm3Calculating, namely introducing the kiln tail flue gas into a decomposing furnace, adding an amino dry powder denitration agent (the addition amount is 60kg/h) at an amino dry powder denitration agent adding point, adding an inorganic mineralizer (the addition amount is 6.5kg/h) at an inorganic mineralizer adding point, and performing denitration (the denitration efficiency in the gooseneck region can reach 61-67%);
NO at the bottom of the cone of the C5 stage preheaterxThe content is 287mg/Nm3The calculation is carried out in such a way that,
adding an amino liquid denitration agent (the addition amount is 70kg/h) at the addition point of the amino liquid denitration agent for denitration (the denitration efficiency is 34-40%), sequentially passing the denitrated flue gas through a C5-level preheater and a C4-level preheater, and discharging the flue gas (NO) through a chimneyxThe content is 73mg/Nm3)。
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A denitration agent for intelligent active amino reduction denitration is characterized by comprising an amino dry powder denitration agent and an amino liquid denitration agent which are independently packaged;
the amino dry powder denitration agent comprises, by mass, 45-57% of fly ash, 18-30% of melamine, 10-20% of calcium carbonate, 5-14% of calcium formate and 1-3.5% of ferric oxide;
the amino liquid denitration agent comprises, by mass, 2-5% of melamine, 3-15% of urotropine, 2-10% of diammonium hydrogen phosphate and 75-80% of water; the pH value of the amino liquid denitration agent is 8-10.
2. The denitrifier of claim 1, further comprising an independently dispensed inorganic mineralizer;
the particle size of the inorganic mineralizer is 100-200 meshes.
3. The denitration agent according to claim 2, wherein the inorganic mineralizer comprises clay and calcium carbonate;
the mass ratio of the clay to the calcium carbonate is 3: 2.
4. The denitration agent according to claim 1, wherein the pH of the amino liquid denitration agent is adjusted by ammonia water having a mass concentration of 20%.
5. A method for denitration of kiln tail flue gas is characterized by comprising the following steps:
the method is carried out in an intelligent active amino reduction denitration device, and a decomposition furnace of the intelligent active amino reduction denitration device comprises an upper part, a lower part and a gooseneck region from top to bottom in sequence; an amino liquid denitration agent adding point is arranged at the upper part of the decomposing furnace; the gooseneck region is provided with an amino dry powder denitration agent adding point;
and (3) introducing the flue gas of the kiln tail smoke chamber into a decomposing furnace, adding an amino liquid denitration agent at the adding point of the amino liquid denitration agent, and adding an amino dry powder denitration agent at the adding point of the amino dry powder denitration agent to perform denitration.
6. The method of claim 5, wherein the addition rate ratio of the amino dry powder denitration agent to the amino liquid denitration agent is (2-3): 1;
the ratio of the introduction rate of the flue gas to the addition rate of the amino dry powder denitration agent is (1-3) to (1-3).
7. The method according to claim 5, characterized in that the gooseneck zone of the decomposition furnace is provided with an inorganic mineralizer addition point;
the height of the addition point of the inorganic mineralizer is the same as that of the addition point of the amino dry powder denitration agent.
8. The method of claim 7, wherein an inorganic mineralizer is added at the inorganic mineralizer addition point;
the adding time of the inorganic mineralizer and the amino dry powder denitration agent is the same.
9. The method of claim 8, wherein the inorganic mineralizer and the amino dry powder denitration agent are added at a rate ratio of 1: 1.
10. The method of claim 5, wherein the smart active amino reduction denitration device further comprises a C4 stage preheater and a C5 stage preheater;
the denitrated flue gas sequentially passes through a C5-level preheater and a C4-level preheater; and the C5-stage preheater and the C4-stage preheater respectively supply air to the kiln tail smoke chamber and the decomposing furnace through air duct outlets.
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| CN115228269A (en) * | 2022-07-19 | 2022-10-25 | 湖北中圣科技有限公司 | Water-soluble biomass SNCR (selective non-catalytic reduction) denitration agent as well as preparation method and application thereof |
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