CN110652872A - Selective non-catalytic reduction denitration accurate injection device and denitration device - Google Patents
Selective non-catalytic reduction denitration accurate injection device and denitration device Download PDFInfo
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- CN110652872A CN110652872A CN201911129171.3A CN201911129171A CN110652872A CN 110652872 A CN110652872 A CN 110652872A CN 201911129171 A CN201911129171 A CN 201911129171A CN 110652872 A CN110652872 A CN 110652872A
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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
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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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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- B01D53/8625—Nitrogen oxides
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Abstract
The utility model provides an accurate injection apparatus of selective non-catalytic reduction denitration and denitrification facility, accurate injection apparatus of selective non-catalytic reduction denitration includes: the device comprises a plurality of spray gun assemblies, a denitration reaction zone and a denitration reaction zone, wherein each spray gun assembly comprises at least one spray gun, and each spray gun is used for spraying a reducing agent to the denitration reaction zone in the hearth; the temperature acquisition module is used for acquiring the temperature information of the injection area corresponding to each spray gun assembly; and the control module is used for controlling the corresponding spray gun assembly to spray or close according to the temperature information of each spraying area. The invention can realize accurate injection based on temperature information, so that the reducing agent and the nitrogen-containing flue gas fully react, and the denitration efficiency is improved.
Description
Technical Field
The invention relates to the technical field of denitration devices, in particular to a selective non-catalytic reduction denitration precise injection device and a selective non-catalytic reduction denitration device comprising the same.
Background
Currently mainstream flue gas denitration techniques include Selective Catalytic Reduction (SCR),Selective non-catalytic reduction (SNCR) and combined denitration (SCR + SNCR). The reaction mechanism of the selective non-catalytic reduction reaction is that under the condition of NO catalyst, reducing agents (ammonia water, urea and the like) containing amino are sprayed at the position of 850-1150 ℃ in the temperature range above the boiler, and NO in the flue gas is converted into ammoniaxReducing to harmless nitrogen and water. The flue gas temperature is one of the key factors influencing the denitration efficiency of the SNCR denitration device. When the temperature of the flue gas is lower than the optimal temperature window of the non-catalytic reduction reaction, namely lower than 850 ℃, the reducing agent cannot react with NO in the flue gasxFully reacting to cause ammonia escape; when the temperature of the flue gas is higher than the optimal temperature window of the non-catalytic reduction reaction, namely higher than 1150 ℃, the reducing agent is subjected to oxidation reaction with oxygen in the flue gas under the action of high temperature, so that more NO is generatedx。
The traditional SNCR denitration device only carries out the layering arrangement of spray guns according to the approximate condition of flue gas distribution above a boiler furnace aiming at the load range of boiler operation. The burning state of the boiler changes in real time, the temperature distribution in the hearth also changes in real time, the change state of the flue gas temperature in the hearth can not be collected in real time by the traditional SNCR denitration device, and only simple spray gun layer cutting control can be carried out according to the change information of the boiler load. Due to the fact that a region deviating from the optimal temperature window of the SNCR possibly exists in the same layer of reaction region, when the section of a hearth is large, the phenomenon of temperature unevenness is more obvious, and therefore ammonia escapes or extra NO is generatedx. Therefore, the traditional SNCR denitration device has low efficiency and is difficult to meet the flue gas treatment requirement.
Disclosure of Invention
The invention aims to provide a selective non-catalytic reduction denitration accurate injection device to solve the problem of low denitration efficiency of the existing equipment due to uneven temperature distribution in a hearth.
The invention provides a selective non-catalytic reduction denitration precision injection device, which comprises:
the denitration reaction device comprises a plurality of spray gun assemblies, a denitration reaction zone and a denitration reaction zone, wherein each spray gun assembly comprises at least one spray gun, and each spray gun is used for spraying a reducing agent to the denitration reaction zone in the hearth;
the temperature acquisition module is used for acquiring the temperature information of the injection area corresponding to each spray gun assembly;
and the control module is used for controlling the corresponding spray gun assembly to spray or close according to the temperature information of each spraying area.
Preferably, the temperature acquisition module includes:
the temperature sensors are arranged above, below or between adjacent spray gun assemblies in the denitration reaction zone;
a temperature calculation module that calculates temperature information of each of the injection regions based on the measurement results of the plurality of temperature sensors.
Preferably, the temperature calculation module performs temperature fitting on the denitration reaction zone according to the measurement results of the plurality of temperature sensors, and calculates a temperature cloud map of the denitration reaction zone, so as to determine the temperature information of each injection zone.
Preferably, the temperature sensor is an infrared temperature sensor.
Preferably, when the temperature of the injection region is within a predetermined temperature range, the control module controls the spray gun assembly corresponding to the injection region to perform injection; when the temperature of the injection zone is not within the predetermined temperature range, the control module controls the spray gun assembly corresponding to the injection zone to close.
Preferably, each spray gun assembly comprises at least one spray gun, the at least one spray gun is arranged in a straight line or in an array mode, and the spray guns penetrate through the furnace wall to spray reducing agent to the denitration reaction zone in the hearth.
Preferably, the hearth comprises a front wall, a rear wall and a pair of side walls, and the spray gun assembly is arranged on at least one of the front wall, the rear wall and the side walls of the hearth.
Preferably, the injection area of each lance assembly does not overlap with the injection areas of the other lance assemblies, and the injection areas of the plurality of lance assemblies cover the denitrification reaction zone.
Preferably, the selective non-catalytic reduction denitration precision injection device further comprises a reducing agent mixed solution storage and metering device, the reducing agent mixed solution metering device is used for storing and metering a reducing agent and dilution water, and each spray gun assembly is connected to the mixed solution storage and metering device through a pipeline.
The invention also provides a selective non-catalytic reduction denitration device which comprises the selective non-catalytic reduction denitration accurate injection device.
Preferably, the selective non-catalytic reduction denitration device further comprises a W-shaped flame boiler, a wall boiler, a four-corner tangential boiler, a grate furnace or a chain furnace.
The invention has the beneficial effects that:
1. the selective non-catalytic reduction denitration accurate injection device acquires the temperature information of the injection region corresponding to each spray gun assembly through the temperature acquisition module, and the control module controls the corresponding spray gun assembly to inject or close according to the temperature information of each injection region. When the temperature of the injection area is in the optimal reaction temperature range, the control module controls the spray gun assembly corresponding to the injection area to perform injection; and when the temperature of the injection area is not in the optimal reaction temperature range, controlling the spray gun assembly corresponding to the injection area to be closed. Accurate injection based on temperature information is realized through this kind of mode for reductant and nitrogenous flue gas fully react, improve denitration efficiency.
2. A plurality of temperature sensor locate denitration reaction zone's top, below or between the adjacent spray gun subassembly, rather than directly set up in the injection zone, can avoid the reductant to spray temperature sensor, improve the temperature measurement precision. And performing temperature fitting in the denitration reaction zone according to the measurement results of the plurality of temperature sensors, and calculating a temperature cloud chart of the denitration reaction zone, wherein the temperature cloud chart can display the temperature information of each injection zone on the section of the whole hearth, so that the temperature information in the discrete non-injection zone is converted into the temperature information of the continuous injection zone.
3. According to the hearth structure, the spray gun assembly is arranged on the front wall, the rear wall or the side wall of the hearth, so that the spraying area of the spray gun assembly can cover the denitration reaction area, and the best mixing effect of the flue gas and the reducing agent is achieved.
The present invention has other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the invention.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts.
Fig. 1 is a schematic structural diagram of a selective non-catalytic reduction denitration precision injection device according to a first embodiment of the invention;
FIG. 2 shows a partial enlarged view of FIG. 1;
FIGS. 3a and 3b show the arrangement of the spray gun assemblies in the first embodiment at a first level and a second level, respectively;
FIG. 4 shows a schematic diagram of a selective non-catalytic reduction denitration precision injection apparatus according to a second embodiment of the present invention;
FIGS. 5a and 5b show the arrangement of the lance assemblies for one floor and the rear wall of the front wall of the hearth, respectively, in a second embodiment;
FIG. 6 shows a schematic view of a selective non-catalytic reduction denitration precision injection apparatus according to a third embodiment of the present invention;
fig. 7a and 7b show the arrangement of the spray gun assemblies of one layer and the side wall of the front wall of the hearth respectively in the third embodiment.
Description of reference numerals:
1, a temperature calculation module; 2, a reducing agent delivery pump sledge; 3a reductant storage module; 4 a dilution water storage module; 5, conveying a pump sledge for the dilution water; 6 metering and mixing module; 7, a compressed air metering module; 8, a blowing air module; 9 a mixed liquid distribution module; 10 a spray gun assembly; 11 platen superheaters; 12 a temperature sensor; 13, a hearth; 14 nitrogen oxide monitoring module, 15 denitration reaction zone, 16 spray guns.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The embodiment of the invention provides a selective non-catalytic reduction denitration precision injection device, which comprises:
the device comprises a plurality of spray gun assemblies, a denitration reaction zone and a denitration reaction zone, wherein each spray gun assembly comprises at least one spray gun, and each spray gun is used for spraying a reducing agent to the denitration reaction zone in the hearth;
the temperature acquisition module is used for acquiring the temperature information of the injection area corresponding to each spray gun assembly;
and the control module is used for controlling the corresponding spray gun assembly to spray or close according to the temperature information of each spraying area.
The traditional SNCR denitration device is usually provided with a plurality of layers of spray guns in a boiler furnace, and simple spray gun layer cutting control is carried out according to the load change information of the boiler, namely, one or more layers of spray guns are controlled to spray. Because the combustion condition of the boiler changes in real time and the temperature distribution in the hearth also changes in real time, the traditional injection mode ensures that the reducing agent cannot react with NO in the flue gas at the optimal temperaturexReact sufficiently to cause ammonia slip or to generate additional NOx。
The selective non-catalytic reduction denitration accurate injection device comprises a plurality of spray gun assemblies, each spray gun assembly comprises at least one spray gun, and each spray gun is used for injecting a reducing agent to a denitration reaction zone in a hearth. The temperature information of the spraying area corresponding to each spray gun assembly is obtained through the temperature acquisition module, and the control module controls the corresponding spray gun assembly to spray or close according to the temperature information of each spraying area. Accurate injection based on temperature information is realized through this kind of mode for reductant and nitrogenous flue gas fully react, improve denitration efficiency.
In one example, the temperature acquisition module includes:
the temperature sensors can be arranged above, below or between adjacent spray gun assemblies in the denitration reaction zone;
and the temperature calculation module calculates the temperature information of each spraying area according to the measurement results of the plurality of temperature sensors.
The spray gun component sprays a reducing agent into the denitration reaction zone, wherein the reducing agent is usually urea aqueous solution, and the mass concentration of the reducing agent is 35-50%. If a temperature sensor is provided in the denitration reaction zone, the injected reducing agent may affect the accuracy of the temperature measurement. Therefore, in the present embodiment, the temperature sensor is disposed above, below, or between adjacent lance assemblies in the denitrification reaction zone to avoid direct injection of the reducing agent onto the temperature sensor. The plurality of temperature sensors may be all disposed below the denitration reaction zone, or all disposed between adjacent lance assemblies. Or one part of the temperature sensors can be arranged above the denitration reaction zone, the other part of the temperature sensors can be arranged below the denitration reaction zone, and the other part of the temperature sensors can be arranged between the adjacent spray gun components. The position combination mode of the temperature sensors can be selected according to the requirement of temperature measurement precision. The temperature information of each spraying area is calculated through the temperature calculation module according to the measuring results of the plurality of temperature sensors, so that the temperature measurement accuracy can be improved.
In one example, the temperature calculation module performs temperature fitting on the denitration reaction zone according to the measurement results of the plurality of temperature sensors, calculates a temperature cloud map of the denitration reaction zone, and accordingly determines temperature information of each injection zone.
The temperature sensor measures temperature information of discrete points, and in addition, in order to avoid influence of the reducing agent on accuracy of temperature measurement, the temperature sensor is arranged above, below or between adjacent spray gun assemblies in the denitration reaction zone, so that the temperature information of the injection area corresponding to each spray gun assembly cannot be directly obtained through the temperature sensor. In one example, the temperature calculation module performs temperature fitting in the denitration reaction zone according to the measurement results of the plurality of temperature sensors, and calculates a temperature cloud chart of the denitration reaction zone, wherein the temperature cloud chart can display the temperature information of each injection zone on the whole furnace section, so that the temperature information in the discrete non-injection zones is converted into the temperature information of the continuous injection zones. Fitting is performed according to the temperatures of the discrete points, and then the temperature cloud chart is calculated, which belongs to the prior art in the field and is not described herein again.
In one example, the temperature sensor is an infrared temperature sensor.
In one example, the control module controls the spray gun assembly corresponding to the injection zone to inject when the temperature of the injection zone is within a predetermined temperature range; the control module controls the spray gun assembly corresponding to the injection zone to close when the temperature of the injection zone is not within the predetermined temperature range. The optimal temperature range for the reduction reaction to occur is 850-1150 deg.C, so the predetermined temperature range may be set to 850-1150 deg.C. When the temperature of one injection area is within the preset temperature range, the control module controls the spray gun component corresponding to the injection area to inject, so that the reducing agent injected by the spray gun component can perform reduction reaction with the flue gas within the injection area and within the optimal temperature range, and the reaction efficiency is improved. On the contrary, when the temperature of the injection area is not in the preset temperature range, the control module controls the spray gun assembly corresponding to the injection area to be closed so as to prevent the reducing agent from being incapable of reacting with NO in the smoke when the temperature of the injection area is too lowxThe full reaction can cause the escape of ammonia, and the reducing agent can be prevented from generating oxidation reaction with oxygen in the flue gas under the action of high temperature when the temperature of the injection area is overhigh, thereby generating more NOx。
In one example, each lance assembly includes at least one lance, the at least one lance being arranged in a line or in an array, the lances projecting reducing agent through the furnace wall into the denitrification reaction zone within the furnace. The spray gun can be fixedly arranged on the furnace wall through a welding sleeve. The number of the spray guns and the arrangement form of the spray guns in each spray gun assembly can be selected according to the parameters such as the size and the specification of the hearth. Typically, each lance assembly comprises 2-5 lances, the 2-5 lances being arranged in a straight line.
In one example, the hearth includes a front wall, a rear wall, and a pair of side walls, and the lance assembly is disposed on at least one of the front wall, the rear wall, and the side walls of the hearth. Generally, the spray gun assembly is arranged on the front wall of the hearth, the spray gun assemblies are arranged layer by layer along the height direction of the hearth, and each spray gun assembly comprises a plurality of spray guns arranged along a straight line. Under the condition that the depth of the hearth is large, the spray gun assembly can be arranged on the front wall and the rear wall of the hearth at the same time or on the front wall and the side wall of the hearth at the same time, so that the spraying area of the spray gun assembly can completely cover the whole denitration reaction area.
In one example, the injection area of each lance assembly does not overlap with the injection areas of the other lance assemblies, and the injection areas of the plurality of lance assemblies completely cover the denitrification reaction zone. Typically, the spray area of each spray gun assembly does not overlap with the spray area of any other spray gun assembly to avoid overspray.
In one example, the selective non-catalytic reduction denitration precision injection device further comprises a reducing agent mixed liquid storage and metering device, the reducing agent mixed liquid metering device is used for storing and metering a reducing agent and dilution water, and each spray gun assembly is connected to the reducing agent mixed liquid storage and metering device through a pipeline.
The embodiment of the invention also provides a selective non-catalytic reduction denitration device which comprises the selective non-catalytic reduction denitration accurate injection device.
In one example, the selective non-catalytic reduction denitration device includes a W-flame boiler, a wall boiler, a tangential firing boiler, a grate furnace, or a grate furnace.
The W-shaped flame boiler is mainly used for burning hard-burning coal such as anthracite and the like, and has the characteristics of higher temperature in a hearth, more combustion control zones and higher excess air coefficient, and NOxThe absolute removal amount of (A) is large. NO of current W-shaped flame boilerxThe average value of the discharge concentration in hours can reach 1000mg/Nm3Above, the instantaneous value can reach 1200mg/Nm3The above. W-shaped flame boilerThe temperature of the hearth is high, the temperature of the flue gas above the hearth can reach more than 1100 ℃, sometimes can reach more than 1200 ℃, the temperature window suitable for SNCR denitration reaction is relatively narrow, and the excessively high temperature of the flue gas can cause the oxidation of a reducing agent, so that the denitration efficiency is reduced. Furthermore, W-fired boiler furnaces typically exhibit a rectangular shape, with a ratio of furnace width to depth approaching 3: 1, and possibly even up to 5: 1, the phenomenon of uneven temperature field of the flue gas is more obvious due to the overlarge cross section of the hearth. Therefore, the selective non-catalytic reduction denitration accurate injection device is particularly suitable for W-shaped flame boilers, and can realize accurate injection of reducing agents in the W-shaped flame boilers and improve denitration efficiency.
Example 1
Fig. 1 is a schematic structural diagram of a selective non-catalytic reduction denitration precision injection device according to a first embodiment of the invention, fig. 2 is a partial enlarged view of fig. 1, and fig. 3a and 3b are views respectively illustrating the arrangement of the spray gun assemblies on a first horizontal plane and a second horizontal plane in the first embodiment. As shown in the attached drawings, the selective non-catalytic reduction denitration accurate injection device comprises:
a plurality of spray gun assemblies 10, wherein each spray gun assembly 10 comprises at least one spray gun 16, and each spray gun 16 is used for spraying a reducing agent to the denitration reaction zone 15 in the hearth 13;
the temperature acquisition module is used for acquiring the temperature information of the injection area corresponding to each spray gun assembly 10;
and the control module is used for controlling the corresponding spray gun assembly 10 to spray or close according to the temperature information of each spraying area.
Wherein, the temperature acquisition module includes:
a plurality of temperature sensors 12, wherein the temperature sensors 12 are arranged below the denitration reaction zone 15;
a temperature calculation module 1, the temperature calculation module 1 calculating temperature information of each injection region based on the measurement results of the plurality of temperature sensors 12. Specifically, the temperature calculation module 1 performs temperature fitting on the denitration reaction region 15 according to the measurement results of the plurality of temperature sensors 12, and calculates a temperature cloud map of the denitration reaction region 15, thereby determining temperature information of each injection region. When the temperature of the injection area is within a preset temperature range, the control module controls the spray gun assembly corresponding to the injection area to perform injection; the control module controls the spray gun assembly corresponding to the injection zone to close when the temperature of the injection zone is not within the predetermined temperature range. In the present embodiment, the predetermined temperature range is set to 850-1150 ℃.
In the present embodiment, six spray gun assemblies 10 are provided, each spray gun assembly 10 including three spray guns 16. Six spray gun assemblies 10 are all arranged on the front wall of the hearth 13. Fig. 2 shows a partial enlarged view of fig. 1, six spray gun assemblies 10 are arranged on two different horizontal planes (a first horizontal plane and a second horizontal plane) along the height direction of the hearth, fig. 3a and 3b show the arrangement of the spray gun assemblies on the first horizontal plane and the second horizontal plane, respectively, three spray guns 16 of each spray gun assembly 10 are arranged at equal intervals along a straight line, and different spray gun assemblies on the same horizontal plane are also arranged at equal intervals along a straight line.
In this embodiment, the selective non-catalytic reduction denitration precision injection apparatus further includes a reducing agent mixed liquid storage and metering device, the reducing agent mixed liquid metering device is used for storing and metering a reducing agent and dilution water, and each spray gun assembly 10 is connected to the reducing agent mixed liquid storage and metering device through a pipeline. Specifically, the reducing agent mixed liquid storage and metering device comprises a reducing agent storage module 3, a reducing agent delivery pump skid 2, a dilution water storage module 4, a dilution water delivery pump skid 5, a metering and mixing module 6 and a mixed liquid distribution module 9. The reducing agent storage module 3 is used for storing a reducing agent, and the dilution water storage module 4 is used for storing dilution water. The reducing agent storage module 3 and the dilution water storage module 4 are respectively connected with the metering and mixing module 6 through a reducing agent delivery pump sledge 2 and a dilution water delivery pump sledge 5, are mixed and metered in the metering and mixing module 6, and are transmitted and distributed to each spray gun assembly 10 through a mixed liquid distribution module 9.
The selective non-catalytic reduction denitration accurate injection device further comprises a compressed air metering module 7 and a blowing air module 8. The air metering module 7 is connected at one end to a source of compressed air and at the other end to a plurality of spray gun assemblies 10 for atomization of the spray guns. The sweep air module 8 is connected to a plurality of lance assemblies 10 for providing a continuous, steady sweep air. The purge air module 8 may include a purge fan and a line connected to the purge fan.
In this embodiment, a platen superheater 11 may be further disposed on the top of the furnace 13 to reduce the temperature of the flue gas at the outlet of the furnace and condense slag.
In this embodiment, a nox monitoring module 14 may be further provided for monitoring whether the emitted nox meets the standard.
In this embodiment, the boiler is a W-flame boiler.
Example 2
Fig. 4 is a schematic view showing a selective non-catalytic reduction denitration fine spray apparatus according to a second embodiment of the present invention, and fig. 5a and 5b are views showing the arrangement of the spray gun assemblies of one floor and the rear wall of the front wall of the furnace chamber in the second embodiment, respectively. The second embodiment differs from the first embodiment in that: three layers of spray gun assemblies 10 are arranged on the front wall of the hearth along the height direction of the hearth, and each layer is provided with 3 spray gun assemblies 10; and a layer of spray gun assemblies 10 is arranged on the rear wall of the hearth, and each layer of spray gun assemblies 10 is provided with 3 spray gun assemblies 10. As with the first embodiment, each spray gun assembly 10 includes three spray guns 16, for a total of 48 spray guns.
Under the condition that the hearth depth is large, the spray gun assemblies are arranged on the front wall and the rear wall of the hearth simultaneously, and the spray area of each spray gun assembly can be ensured to cover the whole denitration reaction area.
Example 3
FIG. 6 shows a schematic view of a selective non-catalytic reduction denitration precision injection apparatus according to a third embodiment of the present invention; fig. 7a and 7b show the arrangement of the spray gun assemblies of one layer and the side wall of the front wall of the hearth respectively in the third embodiment. The third embodiment differs from the first embodiment in that: the boiler is a tangential boiler with four corners, three layers of spray gun assemblies 10 are arranged on the front wall of the hearth along the height direction of the hearth, and 2 spray gun assemblies 10 are arranged on each layer; a pair of side walls of the hearth are respectively provided with a layer of spray gun assembly 10, and each layer of spray gun assembly 10 has 2. As in the first embodiment, each spray gun assembly 10 provided in the front wall includes three spray guns 16, so that a total of 18 spray guns are provided in the front wall. Each lance assembly 10 provided in the side walls comprises two lances 16, so that a pair of side walls is provided with 4 lances.
Under the condition that the hearth depth is large, the spray gun assemblies are arranged on the front wall and the side wall of the hearth simultaneously, and the spray area of the spray gun assemblies can be guaranteed to cover the whole denitration reaction area.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (11)
1. The utility model provides an accurate injection apparatus of selective non-catalytic reduction denitration which characterized in that includes:
the denitration reaction device comprises a plurality of spray gun assemblies, a denitration reaction zone and a denitration reaction zone, wherein each spray gun assembly comprises at least one spray gun, and each spray gun is used for spraying a reducing agent to the denitration reaction zone in the hearth;
the temperature acquisition module is used for acquiring the temperature information of the injection area corresponding to each spray gun assembly;
and the control module is used for controlling the corresponding spray gun assembly to spray or close according to the temperature information of each spraying area.
2. The selective non-catalytic reduction denitration precision injection apparatus of claim 1, wherein the temperature collection module comprises:
the temperature sensors are arranged above, below or between adjacent spray gun assemblies in the denitration reaction zone;
a temperature calculation module that calculates temperature information of each of the injection regions based on the measurement results of the plurality of temperature sensors.
3. The selective non-catalytic reduction denitration precision injection apparatus according to claim 2, wherein the temperature calculation module performs temperature fitting on the denitration reaction zone according to the measurement results of the plurality of temperature sensors, calculates a temperature cloud map of the denitration reaction zone, and determines temperature information of each injection area.
4. The selective non-catalytic reduction denitration precision injection apparatus of claim 2, wherein the temperature sensor is an infrared temperature sensor.
5. The selective non-catalytic reduction denitration precision injection apparatus according to claim 1, wherein the control module controls injection of a spray gun assembly corresponding to the injection zone when the temperature of the injection zone is within a predetermined temperature range; when the temperature of the injection zone is not within the predetermined temperature range, the control module controls the spray gun assembly corresponding to the injection zone to close.
6. The selective non-catalytic reduction denitration precision injection apparatus of claim 1, wherein each spray gun assembly comprises at least one spray gun, the at least one spray gun is arranged in a straight line or in an array form, and the spray gun penetrates through a furnace wall to inject a reducing agent to a denitration reaction zone in the furnace chamber.
7. The selective non-catalytic reduction denitration precision injection apparatus of claim 1, wherein the furnace chamber comprises a front wall, a rear wall and a pair of side walls, and the spray gun assembly is arranged on at least one of the front wall, the rear wall and the side walls of the furnace chamber.
8. The selective non-catalytic reduction denitration fine injection apparatus according to claim 7, wherein an injection area of each of the plurality of lance assemblies does not overlap with injection areas of other lance assemblies, and injection areas of the plurality of lance assemblies cover the denitration reaction zone.
9. The selective non-catalytic reduction denitration precision injection apparatus according to claim 1, further comprising a reducing agent mixed liquid storage and metering device for storing and metering a reducing agent and dilution water, wherein each spray gun assembly is connected to the reducing agent mixed liquid storage and metering device through a pipeline.
10. A selective non-catalytic reduction denitration apparatus, comprising the selective non-catalytic reduction denitration fine injection apparatus according to any one of claims 1 to 9.
11. The scr denitration device according to claim 10, further comprising a W-flame boiler, a wall boiler, a tangential firing boiler, a grate furnace or a grate furnace.
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| CN111773896A (en) * | 2020-06-28 | 2020-10-16 | 苏州西热节能环保技术有限公司 | SNCR denitration accurate ammonia injection control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111773896A (en) * | 2020-06-28 | 2020-10-16 | 苏州西热节能环保技术有限公司 | SNCR denitration accurate ammonia injection control system |
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