CN114797452B - Adjustable bypass injection device and adjusting method - Google Patents
Adjustable bypass injection device and adjusting method Download PDFInfo
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- CN114797452B CN114797452B CN202210406148.XA CN202210406148A CN114797452B CN 114797452 B CN114797452 B CN 114797452B CN 202210406148 A CN202210406148 A CN 202210406148A CN 114797452 B CN114797452 B CN 114797452B
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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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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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
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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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
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention provides an adjustable bypass injection device and an adjusting method, which have simple structures, realize accurate regulation and control of temperature, realize uniform distribution of denitration catalyst inlet temperature, improve safety and stability of a denitration system, and prolong service life of a catalyst. The flue gas treatment device comprises a main flue, wherein the main flue is connected with a bypass flue, a denitration catalyst inlet detection surface is arranged on the main flue, and the denitration catalyst inlet detection surface is arranged at the downstream of the connection position of the main flue and the bypass flue; the flue gas flow control device comprises a main flue, a bypass flue, a plurality of injection grooves, a plurality of guide plates, a flue gas flow control device and a flue gas flow control device, wherein the injection grooves are formed in the connecting positions of the main flue and the bypass flue, the guide plates are arranged in each injection groove, the bypass flue comprises a plurality of flue gas distribution pipelines, the flue gas distribution pipelines are correspondingly connected with the injection grooves, and the flue gas flow control device is arranged on each flue gas distribution pipeline.
Description
Technical Field
The invention relates to the technical field of wide-load flue gas denitration, in particular to an adjustable bypass injection device and an adjusting method.
Background
With the increase of new energy power generation investment such as hydroelectric power, wind power, solar power generation and the like, the duty ratio of thermal power generation in the power industry is reduced year by year, and the thermal power unit is gradually converted into a power grid peak shaving power supply from the previous belt basic load. However, when a large number of existing coal-fired units run under low load, the flue gas temperature at the inlet of the denitration catalyst cannot meet the minimum input temperature of the SCR system, so that low-load NOx emission exceeds standard, and the deep peak shaving requirement cannot be met. In order to improve the inlet flue gas temperature of the denitration catalyst and achieve the purpose of flexibly peak shaving, the most adopted technical route is a high-temperature flue gas bypass modification method at present.
The idea of the transformation method is as follows: the high-temperature flue gas in the hearth is extracted by utilizing the bypass flue, and is introduced into the SCR inlet flue, and the key is the thorough mixing of cold (main flue gas) flue gas and hot (bypass flue gas) flue gas. In the prior art, the mixing strength of the denitration catalyst can be increased through the guide plate or the vortex plate, but the temperature distribution condition of the denitration catalyst inlet in actual production is complex, the phenomenon that the service life of the denitration catalyst is influenced due to too low local temperature still exists, and the temperature distribution of the denitration catalyst inlet cannot be accurately regulated and controlled.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the adjustable bypass injection device and the adjusting method, which have simple structures, realize accurate regulation and control of temperature, realize uniform distribution of the inlet temperature of the denitration catalyst, improve the safety and stability of a denitration system and prolong the service life of the catalyst.
In order to achieve the above purpose, the present invention provides the following technical solutions:
an adjustable bypass injection device comprises a main flue, wherein the main flue is connected with a bypass flue, a denitration catalyst inlet detection surface is arranged on the main flue, and the denitration catalyst inlet detection surface is arranged at the downstream of the connection position of the main flue and the bypass flue;
the flue gas flow control device comprises a main flue, a bypass flue, a plurality of injection grooves, a plurality of guide plates, a flue gas flow control device and a flue gas flow control device, wherein the injection grooves are formed in the connecting positions of the main flue and the bypass flue, the guide plates are arranged in each injection groove, the bypass flue comprises a plurality of flue gas distribution pipelines, the flue gas distribution pipelines are correspondingly connected with the injection grooves, and the flue gas flow control device is arranged on each flue gas distribution pipeline.
Preferably, the number of injection slots is the same as the number of flue gas distribution pipes.
Preferably, the plurality of guide plates in the injection groove are coaxially and rotatably connected through an adjusting shaft, the adjusting shaft is connected with an actuating mechanism, and the actuating mechanism is used for adjusting the angle of the guide plates and controlling the plurality of guide plates to rotate in the same direction at the same time.
Preferably, the actuator adjusts the angle of the deflector to a range of 0 ° -180 °.
Preferably, the injection grooves are of a regular hexahedral structure and are distributed in the main flue at equal intervals.
Preferably, the section of the flue gas distribution pipeline is rectangular.
An adjusting method of an adjustable bypass injection device comprises the following steps:
measuring the temperature value of each sampling hole of the detection surface of the denitration catalyst inlet, and adjusting the angle of a guide plate injected into the groove according to the measurement result;
measuring the temperature value of each sampling hole of the detection surface of the denitration catalyst inlet, and adjusting the opening of a flue gas flow regulating device on a flue gas distribution pipeline according to the measurement result;
and the flue gas temperature distribution at the detection surface of the denitration catalyst inlet is adjusted to meet the catalyst reaction requirement by adjusting the angle of the guide plate and the opening of the flue gas flow adjusting device.
Preferably, the measuring the temperature value of each sampling hole of the detection surface of the denitration catalyst inlet, and adjusting the angle of the guide plate in the injection groove according to the measurement result includes:
s101, coaxially connecting a plurality of guide plates with an executing mechanism, wherein the executing mechanism sets initial angles of the guide plates;
s102, measuring temperature value T of each sampling hole of detection surface of denitration catalyst inlet under initial opening degree by grid method ij Wherein i is temperature test data along the depth direction of the main flue, and j is temperature test data along the width direction of the main flue;
s103, calculating the temperature average value T of each depth direction ia ；
S104, calculating the maximum deviation delta T of the relative average value of the temperature distribution in the depth direction 1 ；
S105, comparing DeltaT 1 And set threshold T c ，
If DeltaT 1 ≤T c When the angle adjustment of the guide plate is completed;
if DeltaT 1 ＞T c When the temperature distribution of the detection surface of the denitration catalyst inlet is changed, the angle of the guide plate is adjusted by the actuating mechanism, and the steps S102 to S105 are repeated until the temperature reaches delta T 1 ≤T c The angle adjustment of the deflector is completed.
Preferably, the measuring the temperature value of each sampling hole of the detection surface of the denitration catalyst inlet, and adjusting the opening of the flue gas flow adjusting device on the flue gas distribution pipeline according to the measurement result includes:
s201, setting a flue gas flow regulating device on a flue gas distribution pipeline to be fully opened;
s202, measuring temperature value T of each sampling hole of detection surface of denitration catalyst inlet under opening degree by grid method ij I is the principal alongTemperature test data in the depth direction of the main flue, j is temperature test data in the width direction of the main flue;
s203, calculating the temperature average value T of each width direction ja ；
S204, calculating the maximum deviation delta T of the relative average value of the temperature distribution in the width direction 2 ；
S205 compares DeltaT 2 And set threshold T c ，
If DeltaT 2 When Tc is less than or equal to Tc, the flue gas flow regulating device is adjusted;
if DeltaT 2 When being more than Tc, the opening of a flue gas flow regulating device on a flue gas distribution pipeline is regulated according to the temperature distribution of a detection surface of a denitration catalyst inlet, and S202-S205 are repeated until delta T 2 ≤T c And the opening degree of the flue gas flow regulating device is adjusted.
Compared with the prior art, the invention has the following beneficial effects:
according to the adjustable bypass injection device provided by the invention, on the basis of a high-temperature flue gas bypass modification method, the plurality of flue gas distribution pipelines are arranged on the bypass flue, the flue gas flow regulating device for regulating the flue gas flow is arranged in each flue gas distribution pipeline, the injection groove corresponding to the flue gas distribution pipeline is arranged in the main flue, the adjustable guide plate is arranged in the injection groove, the angle of the guide plate is regulated to regulate the flow direction of flue gas, bypass flue gas is led out from the boiler steering chamber, is distributed and converged to the injection groove in the main flue through the bypass flue and the flue gas distribution pipeline and is mixed with main flue gas, and the flue gas flow direction are regulated through the flue gas flow regulating device in the bypass flue and the guide plate in the main flue, so that the full mixing of the main flue gas and the bypass flue gas is ensured, the mixing strength is improved, finally, the flue gas temperature distribution at the denitration catalyst inlet is uniform, the local cold point of the denitration catalyst inlet is improved, the safety and the stability of the denitration system are further improved, and the service life of the catalyst is prolonged.
The invention also provides an adjusting method of the adjustable bypass injection device, which comprises the steps of finding a local cold point of temperature distribution according to the measured temperature of the denitration catalyst inlet, uniformly adjusting the angle of the guide plate according to the cold point position by the actuating mechanism, mixing hot flue gas injected into the bypass flue at the cold point position with cold flue gas, thereby improving the local temperature at the cold point position, improving the problem of too low local temperature, simultaneously further optimizing the uniformity of the temperature distribution of the denitration catalyst inlet, selectively adjusting the opening of the flue gas flow adjusting device according to the actual measured temperature distribution condition of the denitration catalyst inlet and the temperature required by the catalyst reaction, if the actual temperature is smaller than the required temperature, adjusting the opening of the flue gas flow adjusting device, increasing the injection flow of hot flue gas in the bypass flue until the actual temperature meets the temperature requirement required by the catalyst reaction, otherwise, adjusting the opening of the flue gas flow adjusting device, and reducing the injection of the hot flue gas flow. The adjustment method disclosed by the invention can optimize the temperature distribution of the denitration catalyst inlet, prolong the service life of the catalyst, effectively reduce the problem of low-temperature ammonium bisulfate deposition of an air preheater and an economizer at the downstream of a boiler, ensure the safe and stable operation of a denitration system, and is simple and effective in adjustment operation and strong in operability.
Drawings
FIG. 1 is a flow chart of the flue gas injection mixing process of the adjustable bypass injection device of the present invention;
FIG. 2 is a schematic top view of the injection well of the present invention;
FIG. 3 is a schematic side view of the flue gas distribution pipeline according to the present invention;
FIG. 4 is a schematic view of the placement angle (upward) of baffles in an injection tank according to an embodiment of the present invention;
fig. 5 is a schematic view of the arrangement angle (downward) of the baffle in the injection slot according to an embodiment of the present invention.
In the figure, a bypass flue 1, a flue gas distribution pipeline 2, a special-shaped piece 3, an injection groove 4, a denitration catalyst inlet detection surface 5, a main flue 6 and a guide plate 7.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the attached drawing figures:
as shown in fig. 1, the adjustable bypass injection device of the invention comprises a main flue 6, wherein the main flue 6 is connected with a bypass flue 1, a denitration catalyst inlet detection surface 5 is arranged on the main flue 6, and the denitration catalyst inlet detection surface 5 is arranged at the downstream of the connection position of the main flue 6 and the bypass flue 1;
the connection position of the main flue 6 and the bypass flue 1 is provided with a plurality of injection grooves 4, each injection groove 4 is internally provided with a plurality of guide plates 7, the bypass flue 1 comprises a plurality of flue gas distribution pipelines 2, the flue gas distribution pipelines 2 are correspondingly connected with the injection grooves 4, and each flue gas distribution pipeline 2 is provided with a flue gas flow regulating device.
The invention provides an adjustable bypass injection device, which is based on a high-temperature flue gas bypass reconstruction method, a plurality of flue gas distribution pipelines 2 are arranged on a bypass flue 1, an adjustable flue gas flow regulating device for regulating the flow of flue gas is arranged in each flue gas distribution pipeline 2, an injection groove 4 corresponding to the flue gas distribution pipeline 2 is arranged in a main flue 6, an adjustable guide plate 7 is arranged in the injection groove 4, the angle of the guide plate 7 is regulated to realize the regulation of the flow direction of flue gas, bypass flue gas is led out from a boiler steering chamber, is distributed and converged to an injection groove 4 in the main flue 6 through the bypass flue 1 and the flue gas distribution pipeline 2 and is mixed with main flue gas, and the flue gas flow and the flow direction of flue gas are regulated through the flue gas flow regulating device in the bypass flue 1 and the guide plate 7 in the main flue 6, so that the full mixing of the main flue gas and the bypass flue gas is ensured, the mixing strength is improved, the flue gas temperature distribution at the position of a denitration catalyst inlet detection surface 5 is uniform, the local cold point of the denitration catalyst inlet detection surface 5 is improved, the safety and the stability of the denitration system are further improved, and the service life of the catalyst is prolonged.
All the blades of the guide plates 7 in the injection groove 4 are coaxially connected in a rotating mode through an adjusting shaft, the adjusting shaft is connected with an actuating mechanism, all the blades are controlled through the same actuating mechanism, and the actuating mechanism is used for adjusting the angle of the guide plates 7 and controlling the guide plates 7 to deflect to the same angle at the same time and rotate in the same direction. The design structure of the coaxial connection simultaneous control is simple, the adjustment operation is simple and convenient, the regular adjustment is convenient, and the design structure of the flue gas distribution pipeline 2 in the bypass flue 1 and the injection groove 4 in the main flue 6 can be matched with the design structure.
Preferably, the actuator adjusts the angle of the deflector 7 in the range of 0 ° -180 °.
Preferably, each blade of the shutter type deflector has a length of about 100mm and is arranged in a diagonal direction of the injection groove 4; the length design of the guide plate 7 blades is not too long, and the design of the short blades can effectively prevent dust accumulation and jamming in the channel, and the guide plate 7 is arranged along the diagonal direction to meet the common arrangement structure of the guide plate.
Wherein the number of the injection grooves 4 is the same as the number of the flue gas distribution pipelines 2.
Wherein, the flue gas flow regulating device adopts an adjustable manual regulating door device.
Preferably, the number of the flue gas distribution pipelines 2 can be 3-6, the specific number is determined according to the size of the bypass flue 1, and the section of the flue gas distribution pipeline 2 adopts a rectangular section, so that the corresponding manual adjusting door is convenient to install.
Preferably, the injection grooves 4 are of a regular hexahedral structure, and the injection grooves 4 are uniformly distributed in the main flue 6 at equal intervals, so that the main flue gas is ensured to have better uniformity when the bypass flue 1 is closed; the cross section of the injection groove 4 can be the same as or different from the cross section of the flue gas distribution pipeline 2, and when the cross sections are inconsistent, the two can be connected through the special-shaped piece 3.
The invention also provides an adjusting method of the adjustable bypass injection device, which comprises the following steps:
s1, measuring the temperature value of each sampling hole of a detection surface 5 of a denitration catalyst inlet, and adjusting the angle of a guide plate 7 in an injection groove 4 according to a measurement result;
s2, measuring the temperature value of each sampling hole of the denitration catalyst inlet detection surface 5, and adjusting the opening of an internal flue gas flow regulating device on the flue gas distribution pipeline 2 according to the measurement result;
and S3, optimizing the flue gas temperature distribution at the detection surface 5 of the denitration catalyst inlet by adjusting the opening of the guide plate 7 and the opening of the flue gas flow regulating device until the flue gas temperature distribution meets the catalyst reaction requirement.
Because the injection mode of the bypass flue gas has a corresponding relation with the temperature field distribution of the denitration catalyst inlet detection surface 5, the correlation between the two is excavated, and the injection mode is changed by adjusting the opening of the flue gas flow regulating device and the angle of the guide plate 7 in the flue gas distribution pipeline 2, so that the bidirectional adjustable temperature of the denitration catalyst inlet detection surface 5 in the front-back direction (depth direction) and the left-right direction (width direction) is realized.
Specifically, the step S1 of measuring the temperature value of each sampling hole of the detection surface 5 of the denitration catalyst inlet, and adjusting the angle of the baffle 7 in the injection tank 4 according to the measurement result includes:
s101, coaxially connecting a plurality of guide plates 7 with an executing mechanism, wherein the executing mechanism sets initial angles of the guide plates 7;
wherein, the initial angle of the deflector 7 is set by the actuating mechanism and is generally parallel to the incoming flow direction of the main flue gas as the initial angle.
S102, measuring temperature values T of sampling holes of denitration catalyst inlet detection surface 5 under initial opening degree by grid method ij Wherein i is temperature test data along the depth direction of the main flue 6, and j is temperature test data along the width direction of the main flue 6;
s103, calculating the temperature average value T of each depth direction ia ；
Wherein the temperature average value T in the depth direction ia The expression of (2) is:
where m is denoted as the number of flue gas distribution pipes 2 or injection channels 4.
S104, calculating the maximum deviation delta T of the relative average value of the temperature distribution in the depth direction 1 ；
The maximum deviation from the average value is calculated by the difference between the maximum (minimum) temperature point and the average temperature value.
S105, comparing DeltaT 1 And set threshold T c ，
If DeltaT 1 ≤T c When the angle adjustment of the guide plate 7 is completed;
if DeltaT 1 ＞T c When the temperature distribution of the denitration catalyst inlet detection surface 5 is used, the angle of the guide plate 7 is adjusted through the actuating mechanism, and the steps 102 to 105 are repeated until delta T is reached 1 ≤T c The angle adjustment of the deflector 7 is completed.
Wherein, according to the requirements of the general low-load transformation technical protocol, T c And selecting deviation within 10 ℃.
Further, under the condition that the opening degree of the guide plate 7 is optimal, the flue gas flow rate adjusting device is adjusted, the step S2 of measuring the temperature value of each sampling hole of the denitration catalyst inlet detecting surface 5, and adjusting the opening degree of the flue gas flow rate adjusting device in the flue gas distribution pipeline 2 according to the measurement result includes:
s201, setting a flue gas flow regulating device in a flue gas distribution pipeline 2 to be fully opened;
s202, measuring temperature values T of sampling holes of detection surface 5 of denitration catalyst inlet under opening degree by grid method ij I is temperature test data along the depth direction of the main flue 6, and j is temperature test data along the width direction of the main flue 6;
s203, calculating the temperature average value T of each width direction ja ；
Wherein the average value T of the temperature in the width direction ja The expression of (2) is:
where m is denoted as the number of flue gas distribution pipes 2 or injection channels 4.
S204, calculating the maximum deviation delta T of the relative average value of the temperature distribution in the width direction 2 ；
The maximum deviation from the average value is calculated by the difference between the maximum (minimum) temperature point and the average temperature value.
S205, comparing DeltaT 2 And set threshold T c ，
If DeltaT 2 When Tc is less than or equal to Tc, the flue gas flow regulating device is adjusted;
if DeltaT 2 When being more than Tc, the opening of a flue gas flow regulating device in the flue gas distribution pipeline 2 is regulated according to the temperature distribution of the denitration catalyst inlet detection surface 5, and 202-205 is repeated until delta T is reached 2 ≤T c And the opening degree of the flue gas flow regulating device is adjusted.
Wherein T is c 10℃was chosen.
The adjusting principle for adjusting according to the temperature distribution of the denitration catalyst inlet detection surface 5 in the invention is specifically as follows: according to the measured temperature of the denitration catalyst inlet detection surface 5, a local cold point of temperature distribution is found, the angle of the guide plate 7 is uniformly adjusted according to the cold point position through an actuating mechanism, hot flue gas injected into the bypass flue 1 at the cold point position is mixed with cold flue gas, so that the local temperature at the cold point position is improved, after adjustment, in order to further optimize the uniformity of the temperature distribution of the denitration catalyst inlet detection surface 5, the opening of the flue gas flow regulating device is selectively adjusted according to the actually measured temperature distribution condition of the denitration catalyst inlet detection surface 5 and the temperature required by the catalyst reaction, if the actual temperature is smaller than the required temperature, the opening of the flue gas flow regulating device is increased, the injection flow of hot flue gas in the bypass flue 1 is increased until the actual temperature meets the temperature requirement required by the catalyst reaction, otherwise, the opening of the flue gas flow regulating device is reduced, and the injection of the hot flue gas flow is reduced.
Further, the measuring holes of the denitration catalyst inlet detecting surface 5 of some units are arranged in front of the ammonia injection grid, the test results are not representative, and the guiding optimization adjustment of the flue gas flow adjusting device and the guide plate 7 can be performed through reference value simulation or denitration outlet test results.
By means of the scheme, the adjustable bypass flue gas injection device and the adjusting method can optimize the temperature distribution of the denitration catalyst inlet detection surface 5, prolong the service life of the catalyst, effectively reduce the problem of low-temperature ammonium bisulfate deposition of an air preheater and an economizer at the downstream of a boiler and ensure the safe and stable operation of a denitration system.
Examples
In this embodiment, as shown in fig. 1-5, the section of the bypass flue 1 is 1100mm×4800mm, the number n of flue gas distribution pipes 2 is 5, the section of the flue gas distribution pipes 2 is 1100mm×900mm, and a corresponding manual adjustment door is arranged in each flue gas distribution pipe 2. The structure of the injection groove 4 is a regular hexahedron which is uniformly distributed in the main flue, and the section of the injection groove 4 is 2000mm multiplied by 800mm; the number of the injection grooves 4 is the same as that of the distribution pipelines, and each injection groove 4 is internally provided with a corresponding shutter type guide plate.
The injection mode of the bypass flue gas and the distribution of the temperature field of the detection surface 5 of the denitration catalyst inlet have the corresponding relation: the flue gas distribution pipeline 2 and the manual adjusting door can change the temperature distribution of the denitration catalyst inlet detection surface 5 in the front-back (depth) direction, and the shutter type guide plate 7 can change the temperature distribution of the denitration catalyst inlet detection surface 5 in the left-right (width) direction; the injection mode is changed through the adjustment of the flue gas distribution pipeline 2, the manual adjusting door and the shutter type guide plate, so that the temperature of the denitration catalyst inlet detection surface 5 in the front-back direction and the left-right direction can be adjusted in a bidirectional manner.
The bypass flue gas is led out from the boiler steering chamber, passes through the bypass flue 1, the flue gas distribution pipeline 2 and the injection groove 4, and is mixed with the main flue gas in the main flue 6.
As shown in fig. 4 and 5, which are shutter type deflectors each having a length of 100mm, are arranged in a diagonal direction of the injection groove 4; around the fixed axis, the angle can be adjusted either upward (fig. 4) or downward (fig. 5). All the blades are coaxially connected and controlled by the same actuating mechanism, and the actuating mechanism drives the driven mechanism through gear control, so that the guide plate 7 deflects the same angle. The scale is marked outside the actuating mechanism, and the adjusting range is 0 to 180 degrees, and the corresponding upper full closing and lower full closing are achieved.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The adjustable bypass injection device is characterized by comprising a main flue (6), wherein the main flue (6) is connected with a bypass flue (1), a denitration catalyst inlet detection surface (5) is arranged on the main flue (6), and the denitration catalyst inlet detection surface (5) is arranged at the downstream of the connection position of the main flue (6) and the bypass flue (1);
the flue gas flow control device comprises a main flue (6) and a bypass flue (1), wherein a plurality of injection grooves (4) are formed in the connection position of the main flue (6) and the bypass flue (1), a plurality of guide plates (7) are arranged in each injection groove (4), the bypass flue (1) comprises a plurality of flue gas distribution pipelines (2), the flue gas distribution pipelines (2) are correspondingly connected with the injection grooves (4), and each flue gas distribution pipeline (2) is provided with a flue gas flow control device;
the injection grooves (4) are of regular hexahedral structure, and the injection grooves (4) are distributed in the main flue (6) at equal intervals;
the section of the flue gas distribution pipeline (2) is rectangular;
wherein, each injection groove (4) is internally provided with a corresponding shutter type guide plate (7); the flue gas flow regulating device adopts a manual regulating door;
the injection mode of the bypass flue gas and the temperature field distribution of the denitration catalyst inlet detection surface (5) have a corresponding relation: the flue gas distribution pipeline (2) and the manual adjusting door are used for changing the temperature distribution of the denitration catalyst inlet detection surface (5) in the front-back direction, and the shutter type guide plate (7) is used for changing the temperature distribution of the denitration catalyst inlet detection surface (5) in the left-right direction; the injection mode is changed through the adjustment of the flue gas distribution pipeline (2), the manual adjusting door and the shutter type guide plate (7), so that the temperature of the denitration catalyst inlet detection surface (5) in the front-back direction and the left-right direction can be adjusted in a bidirectional manner.
2. An adjustable bypass injection device according to claim 1, characterized in that the number of injection slots (4) is the same as the number of flue gas distribution pipes (2).
3. An adjustable bypass injection device according to claim 1, characterized in that the plurality of guide plates (7) in the injection groove (4) are connected in a coaxial rotation manner by an adjusting shaft, the adjusting shaft is connected with an actuating mechanism, and the actuating mechanism is used for adjusting the angle of the guide plates (7) and controlling the plurality of guide plates (7) to rotate in the same direction at the same time.
4. An adjustable bypass injection device according to claim 3, characterized in that the actuator adjusts the angle of the deflector (7) in the range of 0 ° -180 °.
5. A method of adjusting an adjustable bypass injection device, characterized in that it is based on an injection device according to any one of claims 1-4, comprising the steps of:
measuring the temperature value of each sampling hole of the denitration catalyst inlet detection surface (5), and adjusting the angle of a guide plate (7) in the injection groove (4) according to the measurement result;
measuring the temperature value of each sampling hole of the denitration catalyst inlet detection surface (5), and adjusting the opening of a flue gas flow regulating device on the flue gas distribution pipeline (2) according to the measurement result;
the flue gas temperature distribution at the detection surface (5) of the denitration catalyst inlet is adjusted to meet the catalyst reaction requirement by adjusting the angle of the guide plate (7) and the opening of the flue gas flow adjusting device;
measuring the temperature value of each sampling hole of the denitration catalyst inlet detection surface (5), and adjusting the angle of a guide plate (7) in the injection groove (4) according to the measurement result comprises the following steps:
s101, coaxially connecting a plurality of guide plates (7) with an executing mechanism, wherein the executing mechanism sets initial angles of the guide plates (7);
s102, measuring temperature values T of sampling holes of a denitration catalyst inlet detection surface (5) under initial opening degree by using a grid method ij Wherein i is temperature test data along the depth direction of the main flue (6), and j is temperature test data along the width direction of the main flue (6);
s103, calculating the temperature average value T of each depth direction ia ；
S104, calculating the maximum deviation delta T of the relative average value of the temperature distribution in the depth direction 1 ；
S105, comparing DeltaT 1 And set threshold T c ，
If DeltaT 1 ≤T c When the angle adjustment of the guide plate (7) is completed;
if DeltaT 1 ＞T c When the temperature distribution of the denitration catalyst inlet detection surface (5) is used, the angle of the guide plate (7) is adjusted through the actuating mechanism, and the steps S102-S105 are repeated until delta T is reached 1 ≤T c The angle adjustment of the guide plate (7) is completed;
the measuring of the temperature value of each sampling hole of the denitration catalyst inlet detection surface (5) and the adjustment of the opening of the flue gas flow regulating device on the flue gas distribution pipeline (2) according to the measurement result comprise:
s201, setting a flue gas flow regulating device on a flue gas distribution pipeline (2) to be fully opened;
s202, measuring the opening degree by a grid methodTemperature value T of each sampling hole of inlet detection surface (5) of lower denitration catalyst ij I is temperature test data along the depth direction of the main flue (6), and j is temperature test data along the width direction of the main flue (6);
s203, calculating the temperature average value T of each width direction ja ；
S204, calculating the maximum deviation delta T of the relative average value of the temperature distribution in the width direction 2 ；
S205 compares DeltaT 2 And set threshold T c ，
If DeltaT 2 When Tc is less than or equal to Tc, the flue gas flow regulating device is adjusted;
if DeltaT 2 When being more than Tc, the opening of a flue gas flow regulating device on a flue gas distribution pipeline (2) is regulated according to the temperature distribution of a denitration catalyst inlet detection surface (5), and S202-S205 are repeated until delta T is reached 2 ≤T c And the opening degree of the flue gas flow regulating device is adjusted.
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| JP3242488U (en) | 2023-06-21 |
| CN114797452A (en) | 2022-07-29 |
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