CN113304599A - Spray gun arrangement method for preventing cyclone tube from skinning - Google Patents
Spray gun arrangement method for preventing cyclone tube from skinning Download PDFInfo
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- CN113304599A CN113304599A CN202110521978.2A CN202110521978A CN113304599A CN 113304599 A CN113304599 A CN 113304599A CN 202110521978 A CN202110521978 A CN 202110521978A CN 113304599 A CN113304599 A CN 113304599A
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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
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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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
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- B01D2258/0283—Flue gases
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Abstract
The invention discloses a spray gun arrangement method for preventing a cyclone from skinning, wherein the cyclone sequentially comprises a cyclone volute, a cyclone cylinder body, a cyclone cylinder circular truncated cone body and a cyclone cylinder cone body from top to bottom, a plurality of spray guns are arranged, each spray gun is arranged on the cyclone cylinder body part, and the spray guns are arranged in the cyclone cylinder in a mode of avoiding a high-concentration solid particle area on the side wall part of the cyclone cylinder body and are sequentially arranged in an ascending mode in the opposite direction to the airflow rotating direction in the cyclone cylinder; the heads of all the spray guns are arranged in a downward inclined mode; the spray gun penetrates through the interior of the protective sleeve, cooling substances are not communicated with the interior of the protective sleeve, the protective sleeve and the spray gun are not in contact with the interior of the cyclone cylinder, and the protective sleeve is connected with the cylinder of the cyclone cylinder through a connecting pipe so as to enable the protective sleeve to rotate. The invention greatly reduces the contact probability of high-temperature materials and the spray gun, prevents the cyclone cylinder from being skinned and improves the denitration efficiency.
Description
Technical Field
The invention belongs to the technical field of flue gas denitration, and particularly relates to a spray gun arrangement method for preventing a cyclone cylinder from skinning.
Background
Nitrogen oxide is a pollutant harmful to the environment and is easy to cause harm such as acid rain. In order to strengthen the environmental protection, China sets GB4915-2013 'emission Standard of atmospheric pollutants for Cement industry' for controlling the emission of nitric oxides. At present, Selective non-catalytic reduction (SNCR) technology is mostly adopted in the cement industry to reduce the emission of nitrogen oxides. The SNCR does not need the action of a catalyst in a specific temperature window (about 850-1050 ℃), a reducing agent and NOx in the flue gas react to generate pollution-free N2 and H2O, the aim of removing the NOx in the flue gas is fulfilled, and the SNCR is widely applied due to the advantages of simple modification, low investment and the like of the SNCR technology. However, early spray guns of SNCR systems were generally disposed at the outlet of the decomposing furnace or the outlet of the five-stage cyclone, so that ammonia and nitrogen oxides were not uniformly mixed, and the reaction was also inhibited by calcium oxide in the flue gas of the cement kiln.
In recent years, a new technology of arranging a spray gun at a cylinder part of a five-stage cylinder, which is disclosed in Chinese patent publication No. CN110523259A, and simultaneously adopting a long spray gun to directly feed ammonia water into a dilute phase zone of a cyclone cylinder with low calcium oxide concentration for reaction has appeared. Although high-concentration calcium oxide in the flue gas is avoided, the utilization efficiency of ammonia water can be improved, the escape of ammonia gas is reduced, and the emission concentration of nitrogen oxides is reduced. But the arrangement method directly places the spray gun on the cylinder of the five-stage cylinder, and the spray gun is inserted into the inner wall part of the cyclone cylinder to directly contact with a large amount of hot materials with the temperature of 900 ℃ in the cyclone cylinder because the high-concentration solid particle area of the side wall part of the cylinder is not avoided; meanwhile, because ammonia water flows in the spray gun, the temperature is generally approximate to the room temperature, and therefore, high-temperature hot material particles are contacted with the cold spray gun surface and then are sticky, and the crusting of the spray gun on the side wall of the cylinder is formed. In addition, because the spray gun is horizontally arranged, a small amount of ammonia water at the head of the spray gun can flow along the outer surface of the spray gun due to pressure fluctuation in the using process of the spray gun and is contacted with hot materials to form the head crust of the spray gun. The five-stage cylinder forms a large amount of crusts, seriously influences the continuity and safety of cement production and is a technical problem which needs to be solved. In addition, because the long spray gun is in direct contact with high-temperature flue gas in the cyclone, the surface temperature difference of the spray gun is large, the temperature field changes violently, the rigidity of the spray gun is reduced, and particularly, the root of the spray gun bears large bending stress, so that the service life of the spray gun is shortened, and the change is frequent. In the continuous operation process of the long spray gun, the rigidity is reduced due to the fact that the temperature of the wall of the spray gun is high, and therefore the position of the head of the spray gun for spraying ammonia water can deviate from the design position, and the adverse effects that denitration efficiency is reduced, the amount of ammonia water is increased and the like are caused.
In addition, most of the early spray gun protection methods are to add a set of protection sleeves outside the spray gun, and to introduce compressed air and other gases into the protection sleeves to isolate the spray gun from high-temperature flue gas, thereby protecting the spray gun. However, because a large amount of cold air is introduced into the cement kiln system, the flue gas temperature is reduced, the coal consumption is increased, and meanwhile, high-temperature particles are also in contact with the cold air to form a crust.
CN205701237U discloses a spray gun with an additional protective sleeve, the sleeve and the spray gun are in close contact, the spray gun is protected by the sleeve, the service life of the spray gun is prolonged, and air cooling is not required. However, the sleeve is in close contact with the spray gun, so the surface temperature of the sleeve is still low, and the barrel part of the cyclone barrel still can cause the skinning phenomenon of the cyclone barrel by adopting the spray gun with the protective sleeve.
CN205392151U discloses a spray gun with a thick insulating layer, which utilizes the higher thermal resistance of the insulating layer to protect the spray gun, and utilizes a support sleeve outside the insulating layer to isolate the high-temperature material particles from the low temperature of the spray gun, thereby reducing the heat transfer between the high-temperature material particles and the spray gun. If the traditional high-temperature heat insulation material is adopted, the temperature in the cyclone cylinder is as high as above 850 ℃, and the high-temperature heat conductivity of the heat insulation material is still higher, so that the thickness of the heat insulation layer is larger, the diameter of the support sleeve is larger, the cyclone cylinder can generate larger adverse effect on the flow field of the cyclone cylinder, and the separation efficiency of the cyclone cylinder is influenced. If the newer nano-insulation material is adopted, although the thickness of the heat insulation layer can be kept at a small level, the support sleeve is easy to deform at high temperature, and overstock and crack are caused to the nano-insulation material in the heat insulation layer, so that the heat insulation performance of the nano-insulation material is damaged. In addition, the price of the new nano-insulation material is high and is also a factor which must be considered.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a spray gun arrangement method for preventing the cyclone from skinning, which greatly reduces the contact probability of high-temperature materials and the spray gun, prevents the cyclone from skinning inside and improves the denitration efficiency.
The invention is realized in this way, a spray gun arrangement method for preventing cyclone crusting, the cyclone comprises a cyclone spiral case, a cyclone cylinder body, a cyclone cylinder cone body and a cyclone cylinder cone body from top to bottom in sequence, the spray guns are arranged in a plurality of numbers, each spray gun is arranged at the cyclone cylinder body part, and the spray guns are arranged in the cyclone cylinder in a way of avoiding a high-concentration solid particle area at the side wall part of the cyclone cylinder body and are arranged in a way of ascending in sequence in a way opposite to the airflow rotating direction in the cyclone cylinder; each of the lance heads is arranged obliquely downwards;
the spray gun penetrates through the interior of the protective sleeve, cooling substances are not communicated with the interior of the protective sleeve, the protective sleeve and the spray gun are not in contact with each other in the cyclone cylinder, and the protective sleeve is connected with the cylinder of the cyclone cylinder through a connecting pipe so as to enable the protective sleeve to rotate.
In the above technical solution, preferably, the lance is arranged at a height of 0.6-2m above the connection between the cyclone cylinder and the cyclone cone.
In the above technical solution, preferably, each of the plurality of lances forms an angle of 45 to 89 ° with a centerline of the cyclone.
In the above technical solution, preferably, each of the spray guns is arranged in a circumferentially uniform manner.
In the above technical solution, preferably, the number of the spray guns is 1 to 6.
In the above technical scheme, preferably, the protective sleeve is in flange connection with the connecting pipe outside the cyclone, the protective sleeve is not connected with the cyclone cylinder, the protective sleeve is in flange connection with the spray gun, and the spray gun is not connected with the cyclone cylinder, so that the protective sleeve can be periodically rotated to be ensured to still keep a cylindrical shape, and large-angle deformation caused by high temperature can be avoided, and the spray gun can be damaged.
In the above technical solution, preferably, the protective sleeve extends into the cyclone beyond the dust dense phase region in the cyclone.
In the above technical solution, it is further preferable that the horizontal distance of the protective sleeve penetrating into the cyclone is 0.5-1.5m above the inner wall of the cyclone.
In the above technical solution, preferably, the cyclone is the lowest first-order cyclone at the tail of the cement kiln, or the second lowest first-order cyclone, such as a sixth-order cyclone, a fifth-order cyclone, or a fourth-order cyclone.
The invention has the following advantages and beneficial effects:
firstly, by adopting the spray gun arrangement method for preventing the cyclone from skinning, the spray gun with lower temperature is isolated from high-temperature material particles through the protective sleeve, and the high-temperature material particles cannot be sticky due to sudden temperature reduction to cause skinning in the cyclone.
Secondly, by adopting the spray gun arrangement method for preventing the cyclone from skinning, the spray gun and the protective sleeve are arranged at the cylinder part of the cyclone and avoid the high-concentration solid particle area at the side wall part of the cylinder part of the cyclone, so that the contact probability of high-temperature materials and the spray gun is greatly reduced, and the skinning in the cyclone is reduced.
Thirdly, by adopting the spray gun arrangement method for preventing the cyclone crusting, the spray gun and the center line of the cyclone are in an angle of 45-89 degrees, even if a small amount of ammonia water stays on the spray gun, the ammonia water cannot flow along the spray gun, only drops into the cyclone and is gasified by high-temperature smoke, and the head crusting phenomenon caused by the fact that the small amount of ammonia water at the head of the spray gun flows along the outer surface of the spray gun and contacts with hot materials cannot be formed.
Fourthly, by adopting the spray gun arrangement method for preventing the cyclone skinning, the root of the spray gun is kept in a low-temperature state for a long time and is not contacted with high-temperature gas and high-temperature particles, so that the rigidity of the root of the spray gun body is ensured, the service life of the spray gun is greatly prolonged, the position of the spray gun head for spraying the ammonia water is ensured to be unchanged, the denitration efficiency is not reduced due to the deformation of the spray gun, and the consumption of the ammonia water is not increased.
Fifthly, by adopting the spray gun arrangement method for preventing the cyclone barrel from skinning, the protective sleeve can change the installation position of the protective sleeve and the cyclone barrel by rotating around the axial direction of the protective sleeve, so that the protective sleeve cannot deform due to long-term high-temperature environment, and the service life of the spray gun is prevented from being adversely affected; in addition, the protective sleeve is the only consumable of the whole system, and is made of heat-resistant steel, so that the replacement frequency is low, the replacement cost is low, and the invention has no other use costs such as compressed air and the like.
Drawings
FIG. 1 is a schematic structural diagram of a cyclone provided in an embodiment of the present invention;
FIG. 2 is a schematic structural view of a spray gun arrangement provided by an embodiment of the present invention;
FIG. 3 is a structural diagram of the circumferential arrangement of the spray gun on the cylindrical part of the cyclone provided by the embodiment of the invention;
FIG. 4 is a schematic structural diagram of a connection tube connected to a cyclone cylinder according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a protective sleeve and a connecting pipe according to an embodiment of the present invention;
FIG. 6 is a schematic view of the connection of the spray gun and the protective sleeve according to the embodiment of the present invention;
fig. 7 is a schematic structural diagram of a spray gun arrangement position and a high-concentration solid particle area provided by the embodiment of the invention.
In the figure: 1. a spray gun; 2. a cyclone; 3. a cyclone cone; 4. a cyclone cone frustum; 5. a cyclone cylinder; 6. protecting the sleeve; 7. a connecting pipe; 8. a high concentration solid particle area.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 to 7, an embodiment of the present invention provides a spray gun arrangement method for preventing a cyclone from skinning, where the cyclone 2 sequentially includes a cyclone volute, a cyclone cylinder 5, a cyclone cylinder frustum 4, and a cyclone cylinder cone 3 from top to bottom, the spray guns 1 are arranged in a plurality, each spray gun 1 is arranged at a part of the cyclone cylinder 5, and arranged in the cyclone 2 in a manner of avoiding a high-concentration solid particle region 8 at a side wall part of the cyclone cylinder 5, and sequentially raised and arranged in a direction opposite to a rotation direction of an airflow in the cyclone 2; the heads of the spray guns 1 are arranged in a downward inclined mode; the spray gun 1 penetrates through the interior of the protective sleeve 6, cooling substances do not pass through the interior of the protective sleeve 6, the protective sleeve 6 and the spray gun 1 are not in contact with each other in the cyclone cylinder 2, and the protective sleeve 6 is connected with the cyclone cylinder 5 through the connecting pipe 7 so that the protective sleeve 6 can rotate.
Preferably, the spray gun 1 is arranged at the height of 0.6-2m above the joint of the cyclone cylinder 5 and the cyclone cone 4 so as to avoid the high-concentration solid particle area 8. The spray guns 1 and the central line of the cyclone cylinder 2 form an angle of 45-89 degrees. The spray guns 1 are arranged in a circumferential and uniform distribution mode. The number of the spray guns 1 is 1-6.
Preferably, outside the cyclone 2, the protection sleeve 6 is connected with the connecting pipe 7 by a flange, the protection sleeve 6 is not connected with the cyclone cylinder 5, the protection sleeve 6 is connected with the spray gun 1 by a flange, and the spray gun 1 is not connected with the cyclone cylinder 5, so that the protection sleeve 6 can be periodically rotated to ensure that the protection sleeve 6 still keeps a cylindrical shape as far as possible, and large-angle deformation caused by high temperature can be avoided, thereby damaging the spray gun 1.
The protective sleeve 6 extends into the cyclone cylinder 2 and exceeds the range of a dust dense phase region in the cyclone cylinder 2. Preferably, the horizontal distance of the protective sleeve 6 extending into the cyclone 2 is 0.5-1.5m above the inner wall of the cyclone 2.
The cyclone 2 is the lowest first-stage cyclone at the tail of the cement kiln, or the second lowest first-stage cyclone, such as a sixth-stage cylinder, a fifth-stage cylinder or a fourth-stage cylinder.
In the embodiment, as shown in fig. 2 and 3, 4 spray guns 1 are arranged on the cyclone cylinder 5, wherein 1 spray gun 1 is arranged on the back, the angle between every two adjacent spray guns 1 is 90 degrees, the height of the spray gun 1 with the lowest height from the intersection line of the cyclone cylinder circular table 4 and the cyclone cylinder 5 is 0.6m, and the height of each spray gun 1 is sequentially lifted to be 0.3m in the direction opposite to the airflow rotating direction in the cyclone cylinder 2.
As shown in fig. 5 to 7, the connecting pipe 7 is welded to the cyclone cylinder 5 and forms an angle of 10 ° with the horizontal direction. On the outer side of the cyclone 2, a protective sleeve 6 is connected with a connecting pipe 7 through a flange and is not connected with the cylinder body 5 of the cyclone; the spray gun 1 is connected with the protective sleeve 6 through a flange, the spray gun 1 is not connected with the part of the cyclone cylinder body 5, and the spray gun 1 is not contacted with the protective sleeve 6 in the cyclone cylinder body 5.
The highest concentration solid particle area 8 in the cyclone 2 is the connecting line of the cyclone cone 4 part and the cyclone cylinder 5 part. Meanwhile, the particle motion track of the cyclone cone frustum body 4 part is far denser than that of the cyclone cylinder body 5 part. While the cyclone cylinder 5 section has only a few areas with distinct traces, with a higher concentration of particles. Therefore, in the embodiment, firstly, the positions of the traces of the cyclone cylinder 5 are judged through numerical simulation and actual measurement, then, the spray guns 1 are arranged in parallel with the traces at a certain distance from the traces, the dislocation height of each spray gun 1 is 0.3m, and the height of the lowest intersection line of the spray gun 1, the cyclone cylinder circular table body 4 and the cyclone cylinder 5 is 0.6m, so that the distance from the spray gun 1 (including the protective sleeve 6) to the traces can be ensured to be far, and the contact probability of high-temperature particles and the spray gun 1 (including the protective sleeve 6) is reduced.
Because the root of the spray gun 1 is surrounded by the protective sleeve 6 and can only contact with a small amount of high-temperature flue gas, the heat exchange between the spray gun 1 and the outside flue gas is equivalent to the heat exchange through the surface thermal resistance of the spray gun 1, the heat conduction of the flue gas between the spray gun 1 and the protective sleeve 6, the surface thermal resistance of the inner side of the protective sleeve 6, the thermal resistance of the protective sleeve 6 and the surface thermal resistance of the outer side of the protective sleeve 6 and the high-temperature flue gas. Particularly, the heat conductivity coefficient of the flue gas between the spray gun 1 and the protective sleeve 6 is small, so that the overall thermal resistance can be greatly improved, and the heat exchange between the spray gun 1 and the protective sleeve 6 is reduced. The rigidity of the root of the spray gun 1 is ensured, so that the position of the head of the spray gun 1 can be basically kept unchanged, and the SNCR has ideal denitration effect, ammonia water consumption and the like. The temperature of the protective sleeve 6 is high, and the temperature of the outer surface is close to the temperature of the smoke, so that temperature change can not occur even if high-temperature particles impact the protective sleeve 6, and the phenomenon of skin formation due to adhesion can be caused.
In the cylinder 5 of the cyclone cylinder, the high-temperature material particles are mainly concentrated near the inner wall of the cyclone cylinder 2, and the high-temperature material particles are mainly concentrated within the range of 0.5m of the inner wall of the cyclone cylinder 2 through numerical simulation and actual measurement in the embodiment, so that the horizontal distance of the protective sleeve 6 penetrating into the inner wall of the cyclone cylinder 2 is 0.5m, the separation of the spray gun 1 with lower temperature from the high-temperature material particles can be ensured, and the high-temperature material particles cannot be sticky due to sudden temperature reduction to cause the skin formation in the cyclone cylinder 2.
In this embodiment, the lance 1 is positioned at an angle of 80 degrees with respect to the centerline of the cyclone 2 and at an angle of 10 degrees with respect to the horizontal. Even if a small amount of ammonia water stays on the spray gun 1, the ammonia water cannot flow to the side wall along the spray gun 1 and only drops into the cyclone 2 to be gasified by high-temperature flue gas. Head skinning caused by contact of a small amount of ammonia water at the head of the spray gun 1 flowing along the outer surface of the spray gun 1 and high-temperature materials can not be formed.
The protective sleeve 6 is equivalent to being subjected to the high temperature and dust impact inside the cyclone 2 alone. Although made of high temperature heat resistant steel, deformation may occur for a long time. Protective sleeve 6 and connecting pipe 7 adopt flange joint, and this embodiment sets up the working system of regularly rotating protective sleeve 6, guarantees that protective sleeve 6's high temperature warp evenly to prolonged protective sleeve 6's life-span, also be favorable to preventing that protective sleeve 6 from forming great deformation and overlap joint mutually with spray gun 1.
The attached drawing of the embodiment is a single series of cyclones, and if the attached drawing is a double series of cyclones, the attached drawing is in axisymmetrical arrangement.
This example uses 4 lances. 1-6 spray guns can be respectively arranged according to the concrete conditions of the cement kiln. If 2 spray guns are arranged, the spray guns can be arranged according to a certain angle, and the symmetrical arrangement effect is optimal; if 3 spray guns are arranged, the spray guns can be arranged according to a certain angle, and the effect is optimal when the spray guns form an angle of 120 degrees with each other; and so on.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or some or all of the technical features may be equivalently replaced, and the modifications or the replacements may not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A spray gun arrangement method for preventing a cyclone from skinning is characterized in that the cyclone sequentially comprises a cyclone spiral case, a cyclone cylinder body, a cyclone cylinder circular truncated cone body and a cyclone cylinder cone body from top to bottom, a plurality of spray guns are arranged, each spray gun is arranged on the cyclone cylinder body part, and the spray guns are arranged in the cyclone cylinder in a mode of avoiding a high-concentration solid particle area on the side wall part of the cyclone cylinder body and are sequentially arranged in a rising mode in a mode opposite to the airflow rotating direction in the cyclone cylinder; each of the lance heads is arranged obliquely downwards;
the spray gun penetrates through the interior of the protective sleeve, cooling substances are not communicated with the interior of the protective sleeve, the protective sleeve and the spray gun are not in contact with each other in the cyclone cylinder, and the protective sleeve is connected with the cylinder of the cyclone cylinder through a connecting pipe so as to enable the protective sleeve to rotate.
2. The method as claimed in claim 1, wherein the lance is arranged at a height of 0.6-2m above the junction of the cyclone cylinder and the cyclone cone.
3. The method as claimed in claim 1 or 2, wherein each lance makes an angle of 45-89 ° with the centerline of the cyclone.
4. The method for arranging the spray guns for preventing the cyclone skinning as claimed in claim 1 or 2, wherein each of the spray guns is arranged in a circumferentially uniform manner.
5. The method for arranging lances to prevent cyclone skinning as claimed in claim 1 or 2, wherein the number of lances is 1 to 6.
6. The method as claimed in claim 1, wherein the protective sleeve is flanged to the connection pipe outside the cyclone, the protective sleeve is not connected to the cyclone cylinder, the protective sleeve is flanged to the lance, and the lance is not connected to the cyclone cylinder.
7. The method of claim 1, wherein the protective sleeve extends into the cyclone beyond the dust concentration zone of the cyclone.
8. The method of claim 7, wherein the protective sleeve extends horizontally into the cyclone by a distance of 0.5-1.5m beyond the inner wall of the cyclone.
9. The method as claimed in claim 1, wherein the cyclone is the lowest cyclone, the second lowest cyclone or the second lowest cyclone at the cement kiln tail.
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| 李志强等: "水泥生产线SNCR精准脱硝喷氨点的研究与应用", 《水泥工程》 * |
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| CN113304599B (en) | 2022-05-27 |
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