CN112316684A - Dry-method cement flue gas denitration system - Google Patents

Dry-method cement flue gas denitration system Download PDF

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Publication number
CN112316684A
CN112316684A CN202011182381.1A CN202011182381A CN112316684A CN 112316684 A CN112316684 A CN 112316684A CN 202011182381 A CN202011182381 A CN 202011182381A CN 112316684 A CN112316684 A CN 112316684A
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gear
spray gun
barrel
flue gas
dry
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CN202011182381.1A
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何金峥
崔继中
李靖
冯学军
张锐
张美娟
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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
    • 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
    • B01D53/346—Controlling the process
    • 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
    • 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
    • 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
    • B01D2258/0233—Other waste gases from cement factories
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Nozzles (AREA)

Abstract

The invention discloses a dry-method cement flue gas denitration system, which belongs to the technical field of flue gas denitration and comprises a four-stage cyclone cylinder, a five-stage cyclone cylinder, an outlet pipeline connected with the four-stage cyclone cylinder and the five-stage cyclone cylinder, wherein the four-stage cyclone cylinder, the five-stage cyclone cylinder and the outlet pipeline respectively comprise a cylinder body and a plurality of spray gun groups, an opening used for inserting a spray gun is formed in the cylinder body, the spray gun is inserted into the same body along the radial direction of the cylinder body, the gear ring drives a gear to rotate by rotating the gear ring, and after a straight rack is driven by the gear, the radial displacement assembly controls the spray gun to move along the radial direction of the cylinder body. The device can adjust the spraying position of the spray gun according to the dust concentration in the cyclone, thereby reducing the influence of the dust concentration on the denitration efficiency and meeting the requirements of ultralow NOx emission and ammonia escape emission in the dry cement production process.

Description

Dry-method cement flue gas denitration system
Technical Field
The invention belongs to the technical field of flue gas denitration, and particularly relates to a dry-method cement flue gas denitration system.
Background
With the stricter domestic environmental control, how to realize the NOx emission target required by the environmental control with lower investment cost, especially the NOx less than 50mg/Nm3The requirement of ultra-low emissions is a significant issue. At present, on a dry-method cement rotary kiln, a commonly used denitration control scheme is as follows: using a low nitrogen burner; a staged combustion method is adopted; common SNCR (selective non-catalytic reduction process) and SCR (selective catalytic reduction process). The low-nitrogen burner and the staged combustion method can reduce nitrogen oxides to a certain extent, but the low-nitrogen burner and the staged combustion method can not meet the increasingly strict environmental protection control requirements far away and can only be used as an auxiliary method for controlling the emission of the nitrogen oxides. The common SNCR method can reduce NOx emission to a great extent, and has the following problems: the ammonia injection amount is high, and the production cost is increased; lower target NOx emissions cannot be controlled, i.e. if the environment requires ultra low emissions, this cannot be done using the original de-NOx system. The SCR technology has an effect by theoretical analysis, and has the following problems: large investment, more than ten million yuan; the later-stage use cost is high, the existing SNCR system needs to be combined, and the investment and maintenance of later-stage equipment and the cost for replacing and maintaining the catalyst are high. Therefore, the dry-method cement flue gas denitration system is urgently needed to be provided, has low investment and high efficiency, and can meet the requirements of ultralow NOx emission and ammonia escape emission in the dry-method cement production process.
Disclosure of Invention
In view of this, the present invention provides a dry-method cement flue gas denitration system, which can adjust the spraying position of a spray gun according to the dust concentration in a cyclone, thereby reducing the influence of the dust concentration on the denitration efficiency, and meeting the requirements of ultra-low NOx emission and ammonia escape emission in the dry-method cement production process.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention relates to a dry-method cement flue gas denitration system, which comprises a four-stage cyclone cylinder, a five-stage cyclone cylinder and an outlet pipeline connecting the four-stage cyclone cylinder and the five-stage cyclone cylinder, wherein the four-stage cyclone cylinder, the five-stage cyclone cylinder and the outlet pipeline respectively comprise a cylinder body and a plurality of spray gun groups, an opening for inserting a spray gun is formed in the cylinder body, the spray guns are inserted into the same body along the radial direction of the cylinder body, the spray gun groups are positioned at the same height and are uniformly inserted along the circumferential direction of the cylinder body, the length of the spray gun inserted into the cylinder body is R/3-R/2, and R is the inner side radius of the cylinder body; be provided with the radial displacement subassembly on the barrel, the radial displacement subassembly includes ring gear, gear support and spur rack, the inboard of ring gear with the outside normal running fit of barrel, outer arc rack has been seted up in the outside of ring gear, the gear with outer arc rack meshing just passes through the gear support with the barrel is connected, the gear simultaneously with spur rack meshing, the spur rack sets firmly the outside of spray gun is through rotating the ring gear, the ring gear drives the gear revolve, the spur rack passes through the gear and drives the back, radial displacement subassembly control the spray gun is followed the radial movement of barrel.
Furthermore, the spray gun comprises a gun body and a spray head, an extension guide pipe is fixedly arranged in the open hole, and the inner side of the extension guide pipe is in sliding fit with the gun body.
Further, the outside and the tip of shower nozzle all are provided with the spout, extend the guiding tube and extend to along the radial of barrel the shower nozzle, through radial shrink the spray gun, it can carry out the switching to the partial spout in the outside to extend the guiding tube.
Further, the rifle body with extend and be provided with first sealing washer and second sealing washer between the guiding tube, first sealing washer and second sealing washer are located respectively extend the both ends of guiding tube, the inboard of extending the guiding tube is seted up respectively and is used for holding first annular and the second annular of first sealing washer and second sealing washer.
Furthermore, an annular rail is fixedly arranged on the outer wall of the barrel, and the gear ring is arranged in the annular rail in a sliding mode.
Further, the gear ring is formed by sequentially connecting a plurality of arc-shaped gear ring sections, the outer arc rack is arranged on the outer side of the arc-shaped gear ring sections, a retaining ring is arranged at one end of each arc-shaped gear ring section, and a hook corresponding to the retaining ring is arranged at the other end of each arc-shaped gear ring section.
Furthermore, the arc-shaped tooth ring sections are made of spring steel materials, a rotating handle is fixedly arranged on the outer side of one arc-shaped tooth ring section, and a connecting hole is formed in the outer end of the rotating handle.
Further, the gear support comprises an L-shaped support plate, a cylinder installation part is arranged on one side of the support plate, a gear shaft installation part is arranged on the other side of the support plate, and the gear is in running fit with the gear shaft installation part.
Furthermore, 5 spray guns are arranged on the outer sides of the four-stage cyclone cylinder and the five-stage cyclone cylinder, and 2 spray guns are arranged on the outer side of the cylinder of the outlet pipeline.
The invention has the beneficial effects that:
according to the dry-method cement flue gas denitration system, the opening for inserting the spray gun is formed in the cylinder body, so that the spray gun can be conveniently matched for use, the original equipment does not need to be changed on a large scale, and the cost is reduced. The spray gun is followed the radial of barrel inserts in the same body, and each group's spray gun rifle group is located same height and follows the barrel circumference equipartition inserts, can increase the coverage area, can make the mixed degree of reductant and flue gas reach the best. The length of the spray gun inserted into the cylinder is R/3-R/2, so that the spraying position of the spray gun is positioned at the central position of the cylinder, and the central position of the cylinder has lower dust concentration, so that the influence of the dust concentration on the denitration efficiency can be reduced, the cost is saved, and the requirements of ultralow NOx emission and ammonia escape emission in the dry cement production process can be met.
In the device, the radial displacement assembly is arranged on the barrel, and the distribution condition of dust concentration is slightly influenced due to different process conditions, and the radial displacement assembly controls the spray gun to move along the radial direction of the barrel, so that the extending distance of the spray gun can be changed according to the specific dust concentration condition, the spraying position is optimal, the requirements under different process conditions are met, and after the position is adjusted, the emission standard can be unified, and the cost is reduced.
In the device, the gear ring is rotated, the gear ring drives the gear to rotate, the spur rack drives the rear through the gear, the radial displacement assembly controls the spray gun to follow the radial movement of the barrel, so that the stretching distance of the spray gun can be adjusted from the outer side, the same group of spray guns can be adjusted simultaneously, the stretching distance can be unified, the adjustment is standardized through recording scales and data, and the adjustment is simple, convenient and quick.
Additional advantages, objects, and features of the invention will be set forth in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:
FIG. 1 is a schematic view of the arrangement of the spray gun of the present invention;
FIG. 2 is a schematic view of the installation of the spray gun of the present invention;
FIG. 3 is a schematic view of the structure of the spray gun;
FIG. 4 is an enlarged view of FIG. 3 at A;
FIG. 5 is an enlarged view of FIG. 2 at B;
FIG. 6 is a schematic structural view of an arc-shaped gear ring segment;
FIG. 7 is a schematic view of the buckle and hook engagement;
FIG. 8 is a diagram showing the distribution of the airflow and dust concentration inside the five-stage cyclone;
FIG. 9 is a schematic diagram of the arrangement of a denitration system.
The drawings are numbered as follows: the device comprises a four-stage cyclone 1, a five-stage cyclone 2, an outlet pipeline 3, a barrel 4, a spray gun 5, a gun body 51, a spray head 52, an opening 6, a gear ring 7, an arc gear ring segment 71, a retaining ring 72, a hook 73, a gear 8, a gear support 9, a support plate 91, a barrel mounting part 92, a gear shaft mounting part 93, a straight rack 10, an outer arc rack 11, an extension guide pipe 12, a spray opening 13, a first sealing ring 14, a second sealing ring 15, a first annular groove 16, a second annular groove 17, an annular track 18, a rotating handle 19 and a connecting hole 20.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the description of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Example 1, as shown in FIGS. 1 to 8, the inventionA dry-method cement flue gas denitration system comprises a four-stage cyclone cylinder 1, a five-stage cyclone cylinder 2 and an outlet pipeline 3 connected with the four-stage cyclone cylinder 1 and the five-stage cyclone cylinder 2, wherein the outlet of a decomposing furnace is connected with the inlet of the five-stage cyclone cylinder 2, the outlet of the five-stage cyclone cylinder 2 is connected with the inlet of the four-stage cyclone cylinder 1, the five-stage cyclone cylinder 2 and the outlet pipeline 3 respectively comprise a cylinder body 4 and a plurality of spray gun groups, an opening 6 for inserting a spray gun 5 is formed in the cylinder body 4, the spray guns 5 are inserted into the same body along the radial direction of the cylinder body 4, the spray gun groups are positioned at the same height and are uniformly inserted along the circumferential direction of the cylinder body 4, the length of the spray gun 5 inserted into the cylinder body 4 is R/3-R/2, preferably R/2, wherein R is the inner radius of the cylinder body 4, in, the total length of the spray gun 5 is about 2200mm, the length R/2 extending into the cylinder 4 is about 1500mm, the length of the sprayed liquid is about 1500mm, the liquid spraying divergence angle is about 90 degrees, the spraying diameter is about 900mm, the mixing degree of the reducing agent and the flue gas can be improved to the maximum area, and at the moment, the dust concentration in the area range of 1500mm of the central radius of the cylinder 4 is 150mg/m3About, has little influence on denitration efficiency, and the dust concentration of the rest outer rings is 1000mg/m3About, having great influence to denitration efficiency, aqueous ammonia spray gun 5 adopts conventional spray gun 5, spouts into the appropriate amount of aqueous ammonia of concentration about 20%. Meanwhile, the temperature of the position meets the optimal reaction temperature and is 850-1100 ℃. If the temperature is too low (< 800 ℃), the reaction of NH3 is incomplete, NH3 escapes easily (namely ammonia escapes), and secondary pollution is formed; at too high temperatures (> 1100 ℃), NH3 is readily oxidized to NOx. Therefore, the temperature is too high or too low, which leads to the loss of the reducing agent and the reduction of the NOx removal rate, and the temperature at the deep position meets the optimal reaction temperature of 850-870 ℃, so that the NOx removal rate can be improved. Meanwhile, the air flow at the center of the cylinder body 4 is stable, the area is smaller and is 7.5 square meters, the air flow speed is slower and is 3.5-4.0 m/s, and the denitration reaction time is satisfied: the ammonia water spray gun 5 is positioned at the lower part of the airflow ascending channel at the central part of the five-stage cyclone 2, the flow speed of the flue gas in the five-stage cyclone 2 is 3.5m/s, the reaction time of the ammonia water and the nitrogen oxide can be calculated out to be 1.5s according to the height, the reaction time is improved, and the requirement is metThe time required for the denitration reaction (> 0.5s) was determined.
In the device, be provided with the radial displacement subassembly on barrel 4, the radial displacement subassembly includes tooth ring circle 7, gear 8, gear support 9 and spur rack 10, the inboard of tooth ring circle 7 with the outside normal running fit of barrel 4, outer arc rack 11 has been seted up in the outside of tooth ring circle 7, gear 8 with outer arc rack 11 meshes and passes through gear support 9 with barrel 4 is connected, gear 8 simultaneously with spur rack 10 meshes, spur rack 10 sets firmly the outside of spray gun 5 is through rotating tooth ring circle 7, tooth ring circle 7 drives gear 8 rotates, spur rack 10 drives the back through gear 8, the control of radial displacement subassembly spray gun 5 is followed the radial movement of barrel 4.
According to the dry-method cement flue gas denitration system, the opening 6 for inserting the spray gun 5 is formed in the cylinder 4, so that the spray gun 5 can be conveniently matched for use, the original equipment is not required to be changed on a large scale, and the cost is reduced. The spray gun 5 is along the radial of barrel 4 inserts in the same body, and each group's spray gun rifle group is located same height and follows the barrel 4 circumference equipartition inserts, can increase the coverage area, can make the mixed degree of reductant and flue gas reach the best. The length of the spray gun 5 inserted into the cylinder 4 is R/3-R/2, so that the spraying position of the spray gun 5 is positioned at the central position of the cylinder 4, and the central position of the cylinder 4 has lower dust concentration, so that the influence of the dust concentration on the denitration efficiency can be reduced, the cost is saved, and the requirements of ultralow NOx emission and ammonia escape emission in the dry cement production process can be met.
In the device, the barrel 4 is provided with the radial displacement assembly, the distribution situation of dust concentration is slightly influenced due to the difference of the process conditions, the radial displacement assembly controls the spray gun 5 to move along the radial direction of the barrel 4, so that the extending distance of the spray gun 5 can be changed according to the specific dust concentration situation, the spraying position is optimal, the requirements under different process conditions are met, and after the position is adjusted, the emission standard can still be unified, and the cost is reduced.
In the device, through rotating ring gear 7, ring gear 7 drives gear 8 rotates, spur rack 10 passes through gear 8 and drives the back, radial displacement subassembly control spray gun 5 is followed the radial movement of barrel 4 to just can adjust the distance of stretching into of spray gun 5 from the outside, can adjust same a set of spray gun 5 simultaneously, make to stretch into the distance and can unify, through record scale and data, can also make the adjustment standardized, the adjustment is simple, convenient, swift.
In this embodiment, the spray gun 5 includes a gun body 51 and a spray head 52, the gun body 51 adopts the existing mechanism, the tail of the gun body 51 is connected with an ammonia water supply device, an extension guide pipe 12 is fixedly arranged in the opening 6, and the inner side of the extension guide pipe 12 is in sliding fit with the gun body 51.
In this embodiment, both the outer side and the end of the spray head 52 are provided with the nozzles 13, the extension guide pipe 12 extends to the spray head 52 along the radial direction of the cylinder 4, the spray gun 5 is radially contracted, the extension guide pipe 12 can open and close a part of the nozzles 13 on the outer side, when the spray area needs to be increased, the gun body 51 is radially outwardly retracted for a certain length along the cylinder 4, the extension guide pipe 12 can seal a part of the nozzles 13 on the outer side, under the same pressure of the spray gun 5, the number of the rest of the nozzles 13 is reduced to increase the pressure, so that the spray distances and ranges of the rest of the nozzles 13 can be increased, the spray area can occupy the area of the low dust concentration range in the cylinder 4 as much as possible, the influence on flue gas denitration due to the increase of the denitration area is reduced, the best denitration efficiency is achieved.
In this embodiment, the rifle body 51 with extend and be provided with first sealing washer 14 and second sealing washer 15 between the guiding tube 12, first sealing washer 14 and second sealing washer 15 are located respectively extend the both ends of guiding tube 12, the inboard of extending guiding tube 12 has been offered respectively and has been used for holding first annular 16 and the second annular 17 of first sealing washer 14 and second sealing washer 15, through setting up first sealing washer 14 and second sealing washer 15, can prevent that the flue gas from leaking away in the barrel 4, protected the environment, first sealing washer 14 sets up at the inner end of extending guiding tube 12, can also play the sealing effect to spout 13 simultaneously.
In this embodiment, an annular rail 18 is fixedly disposed on the outer wall of the cylinder 4, and the gear ring 7 is slidably disposed in the annular rail 18. The gear ring 7 is formed by sequentially connecting a plurality of arc-shaped gear ring segments 71, the outer arc rack 11 is arranged on the outer side of the arc-shaped gear ring segments 71, a snap ring 72 is arranged at one end of each arc-shaped gear ring segment 71, a hook 73 corresponding to the snap ring 72 is arranged at the other end of each arc-shaped gear ring segment 71, and the gear ring 7 can be detached through the cooperation of the hook 73 and the snap ring 72, so that the gear ring is convenient to install and maintain, and the occurrence of reasons such as gear jamming is reduced.
In this embodiment, the arc-shaped tooth ring segment 71 is made of a spring steel material and has certain elasticity, so that the hook 73 and the retaining ring 72 can be conveniently installed in a matched manner, certain pre-tightening force can be further achieved after the installation of the arc-shaped tooth ring segment, the use is more convenient, a rotating handle 19 is fixedly arranged on the outer side of one arc-shaped tooth ring segment 71, a connecting hole 20 is formed in the outer end of the rotating handle 19, the connecting hole 20 can be connected with an automatic driving device, the prior art can be specifically adopted, and the description is omitted. The gear support 9 comprises an L-shaped support plate 91, a cylinder mounting part 92 is arranged on one side of the support plate 91, a gear shaft mounting part 93 is arranged on the other side of the support plate 91, and the gear 8 is in running fit with the gear shaft mounting part 93. In the embodiment, a 4000t clinker production line at a certain day is modified according to the invention, and a small amount of hundreds of thousands of capital is invested, namely the NOx emission is realized to be less than 50mg/Nm3The target of (1) is that the dosage of the ammonia water per ton of clinker is 6.3l/t-cli, the operation is stable, the ammonia water is uniformly sprayed into the preheater through a spray gun 5, and simultaneously, the ammonia escape is met by 6mg/Nm3< national Standard 8mg/Nm3The requirements of (1).
In embodiment 2, as shown in fig. 9, in this embodiment, 5 spray guns 5 are arranged outside the cylinder 4 of each of the four-stage cyclone 1 and the five-stage cyclone 2, and the coverage area of the 5 spray guns 5 which are evenly distributed accounts for 90% of the area of the central portion of the five-stage cyclone 2, so as to satisfy the requirement of sufficient ammonia water and NOxThe reaction needs the requirement of high mixing degree, and simultaneously ammonia escape is also reduced, 2 spray guns 5 are arranged outside the cylinder 4 of the outlet pipeline 3. The concrete position of spray gun 5 is upwards about 2300mm in a section of thick bamboo and cone portion position handing-over department of founding, also arranges spray gun 5 at outlet pipe 3 simultaneously, and the position is about 300 ~ 500mm upwards in a section of thick bamboo top that founds, and the highly operation maintenance of being convenient for of 5 positions of aqueous ammonia spray gun is safe convenient. In the embodiment, the nitrogen oxides (NOx) are reduced by uniformly spraying the spray gun 5 into the preheater, so that the discharge amount of the NOx in the flue gas at the outlet of the kiln tail is finally less than 50mg/Nm3Ultra-low emission and simultaneously meets the requirement of 5mg/Nm of ammonia escape3Less than 8mg/Nm of national standard3The requirements of (1). Simultaneously spout into in outlet pipe 3 the purpose and be the incomplete one of the supplement of denitration reaction, improve the denitration rate, can certainly select whether to install and the quantity of installation according to actual conditions, make the denitration reaction more complete.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.

Claims (9)

1. The utility model provides a dry process cement flue gas denitration system, includes level four whirlwind section of thick bamboo, five whirlwind section of thick bamboo and connects the outlet duct of level four whirlwind section of thick bamboo and five whirlwind section of thick bamboo, level four whirlwind section of thick bamboo, five whirlwind section of thick bamboo and outlet duct all include the barrel, its characterized in that: the spray gun device is characterized by further comprising a plurality of spray gun groups, wherein the barrel is provided with an opening for inserting a spray gun, the spray guns are inserted into the same barrel along the radial direction of the barrel, the spray gun groups of each group are positioned at the same height and are uniformly inserted along the circumferential direction of the barrel, the length of the spray gun inserted into the barrel is R/3-R/2, and R is the radius of the inner side of the barrel; be provided with the radial displacement subassembly on the barrel, the radial displacement subassembly includes ring gear, gear support and spur rack, the inboard of ring gear with the outside normal running fit of barrel, outer arc rack has been seted up in the outside of ring gear, the gear with outer arc rack meshing just passes through the gear support with the barrel is connected, the gear simultaneously with spur rack meshing, the spur rack sets firmly the outside of spray gun is through rotating the ring gear, the ring gear drives the gear revolve, the spur rack passes through the gear and drives the back, radial displacement subassembly control the spray gun is followed the radial movement of barrel.
2. The dry-process cement flue gas denitration system according to claim 1, characterized in that: the spray gun comprises a gun body and a spray head, an extension guide pipe is fixedly arranged in the open hole, and the inner side of the extension guide pipe is in sliding fit with the gun body.
3. The dry-process cement flue gas denitration system according to claim 2, characterized in that: the outside and the tip of shower nozzle all are provided with the spout, extend the guiding tube and extend to along the radial of barrel the shower nozzle, through radial shrink the spray gun, it can carry out the switching to the partial spout in the outside to extend the guiding tube.
4. The dry-process cement flue gas denitration system according to claim 3, characterized in that: the rifle body with extend and be provided with first sealing washer and second sealing washer between the guiding tube, first sealing washer and second sealing washer are located respectively extend the both ends of guiding tube, the inboard of extending the guiding tube is seted up respectively and is used for holding first annular and the second annular of first sealing washer and second sealing washer.
5. The dry-process cement flue gas denitration system according to claim 1, characterized in that: an annular rail is fixedly arranged on the outer wall of the barrel, and the gear ring is arranged in the annular rail in a sliding mode.
6. The dry-process cement flue gas denitration system according to claim 5, characterized in that: the gear ring is formed by sequentially connecting a plurality of arc-shaped gear ring sections, the outer arc rack is arranged on the outer side of the arc-shaped gear ring sections, a retaining ring is arranged at one end of each arc-shaped gear ring section, and a hook corresponding to the retaining ring is arranged at the other end of each arc-shaped gear ring section.
7. The dry-process cement flue gas denitration system according to claim 6, characterized in that: the arc-shaped tooth ring sections are made of spring steel materials, a rotating handle is fixedly arranged on the outer side of one arc-shaped tooth ring section, and a connecting hole is formed in the outer end of the rotating handle.
8. The dry-process cement flue gas denitration system according to claim 1, characterized in that: the gear support comprises an L-shaped support plate, a cylinder installation part is arranged on one side of the support plate, a gear shaft installation part is arranged on the other side of the support plate, and the gear is in running fit with the gear shaft installation part.
9. The dry-process cement flue gas denitration system according to claim 1, characterized in that: the outer sides of the four-stage cyclone and the five-stage cyclone are respectively provided with 5 spray guns, and the outer side of the outlet pipeline is provided with 2 spray guns.
CN202011182381.1A 2020-10-29 2020-10-29 Dry-method cement flue gas denitration system Pending CN112316684A (en)

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CN115475508A (en) * 2022-09-28 2022-12-16 天津中材工程研究中心有限公司 Method for judging insertion position of SNCR cyclone spray gun and automatic adjusting system
CN116798767A (en) * 2023-08-24 2023-09-22 长春三鼎变压器有限公司 8-shaped winding former for winding transformer coil

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CN116798767A (en) * 2023-08-24 2023-09-22 长春三鼎变压器有限公司 8-shaped winding former for winding transformer coil
CN116798767B (en) * 2023-08-24 2023-11-21 长春三鼎变压器有限公司 8-shaped winding former for winding transformer coil

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Application publication date: 20210205