CN113418206A - Primary air adjusting method and device based on pulverized coal burner nozzle temperature measurement - Google Patents
Primary air adjusting method and device based on pulverized coal burner nozzle temperature measurement Download PDFInfo
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- CN113418206A CN113418206A CN202110649181.0A CN202110649181A CN113418206A CN 113418206 A CN113418206 A CN 113418206A CN 202110649181 A CN202110649181 A CN 202110649181A CN 113418206 A CN113418206 A CN 113418206A
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- 239000003245 coal Substances 0.000 title claims abstract description 169
- 238000009529 body temperature measurement Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000002485 combustion reaction Methods 0.000 claims abstract description 22
- 238000009826 distribution Methods 0.000 claims abstract description 22
- 230000007246 mechanism Effects 0.000 claims abstract description 19
- 238000010298 pulverizing process Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 10
- 238000004590 computer program Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 239000000571 coke Substances 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
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- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000002802 bituminous coal Substances 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L1/00—Passages or apertures for delivering primary air for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
- F23N2005/181—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using detectors sensitive to rate of flow of air
Abstract
The invention discloses a primary air adjusting method and a primary air adjusting device based on pulverized coal burner nozzle temperature measurement, wherein the method comprises the steps of detecting the temperature distribution of the pulverized coal burner nozzle jet flow direction; finding the ignition position of the pulverized coal airflow according to the temperature distribution; judging whether the distance between the ignition position and the combustor is smaller than a first preset threshold value or not, if so, increasing the primary air speed to enable the distance between the ignition position of the pulverized coal airflow and the combustor not to be smaller than the first preset threshold value; the device comprises a temperature measuring unit, a primary air adjusting unit, a linear driving mechanism, a data acquisition module and a control unit. The invention can help the operator to judge whether the current coal combustion characteristic is matched with the primary air speed through the temperature distribution, effectively reduces the risks of fire extinguishing and a fire nozzle of the burner, improves the adaptability of the burner to the coal, and can provide guidance for the operator to adjust the primary air speed or the primary air pressure.
Description
Technical Field
The invention belongs to the field of thermal energy power engineering, and particularly relates to a primary air adjusting method and device based on pulverized coal burner nozzle temperature measurement.
Background
In the operation of the pulverized coal power station boiler, the adjustment of primary wind speed is an important operation content. The primary air can be used as a conveying medium to ensure smooth conveying of the pulverized coal in the primary air pipe without causing powder blockage accidents, and oxygen is provided for the initial stage of pulverized coal combustion to ensure the stability of ignition. In the process of pulverized coal ignition, the ignition heat of pulverized coal airflow is an important influence factor, and the lower the ignition heat, the easier the pulverized coal airflow is ignited, and the more stable the combustion is. In the primary wind speed control, the lower the wind speed, the smaller the proportion of air in the pulverized coal airflow, and the lower the ignition heat, and the primary wind speed is generally controlled to be as low as possible in order to ensure stable combustion. However, the lower limit of the primary wind speed is limited by the conveying capacity of the pulverized coal, and when the wind speed is too low, the carrying capacity of the pulverized coal is insufficient, so that the primary wind pipe blockage accident can be caused.
Therefore, on the premise of meeting the pulverized coal conveying capacity, the control of the primary air speed needs to be matched with the combustion characteristics of the coal to be combusted. Generally, the higher the volatile content of the coal, the more readily the pulverized coal stream will ignite, and the faster the ignition rate. When the primary wind speed is lower than the ignition rate of the pulverized coal airflow, the ignition surface of the pulverized coal airflow (the section on which ignition occurs when the pulverized coal airflow is sprayed into the hearth) moves towards the nozzle, and the burning loss accident of the burner is easily caused. On the contrary, when the primary wind speed is higher than the ignition rate of the pulverized coal airflow, the ignition face of the pulverized coal airflow moves away from the burner, so that the ignition distance is easily lengthened, and the combustion is unstable.
Due to the change of coal markets, the coal-fired thermal power generating unit generally has the condition that the quality of coal entering a boiler deviates from a design value, the fluctuation of the quality of the coal is large, and even the condition that the bituminous coal for burning the boiler takes lean coal or anthracite as a design coal type exists. When the coal quality is changed greatly, if the primary air speed is not adjusted in time, accidents are easily caused due to the fact that the combustion characteristics of the coal are not matched with the primary air speed.
At present, the adjustment of primary wind speed is mainly judged by subjective experience, the adjustment level is different according to the level of operators, and when the type of coal entering a furnace changes, the adjustment is not guided objectively. When the thermal power generating unit operates in deep peak shaving, in order to ensure stable combustion under low load, the peak shaving coal type with better ignition characteristic is usually changed, and the change of the coal type is superposed with the reduction of primary air pressure under low load, so that the difficulty of combustion control of a hearth is increased, and the importance of accurately judging the ignition state of a nozzle of a combustor is more remarkable.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems in the prior art, the invention provides a primary air adjusting method and a primary air adjusting device based on pulverized coal burner nozzle temperature measurement.
In order to solve the technical problems, the invention adopts the technical scheme that:
a primary air adjusting method based on pulverized coal burner nozzle temperature measurement comprises the following steps:
1) detecting the temperature distribution of the jet flow direction of a nozzle of the pulverized coal burner;
2) finding the ignition position of the pulverized coal airflow according to the temperature distribution;
3) and judging whether the distance between the ignition position of the pulverized coal airflow and the combustor is smaller than a first preset threshold value, if so, increasing the primary air speed, and enabling the distance between the ignition position and the combustor not to be smaller than the preset threshold value.
Optionally, the step 3) further includes, when the primary wind speed is greater than a calibrated value for ensuring the carrying capacity of the pulverized coal, determining whether a distance between the pulverized coal steam firing position and the pulverized coal burner is greater than or equal to a second preset threshold, and if so, reducing the wind speed of the primary wind, where the second preset threshold is greater than the first preset threshold.
Optionally, the step 3) further includes, when the firing positions of the pulverized coal airflows of the plurality of pulverized coal burners in the same pulverizing system are not consistent, adjusting the primary air speed corresponding to each pulverized coal burner to achieve the purpose that the primary air speed of each pulverized coal pipe is matched with the combustion condition of the pulverized coal airflow.
In addition, the invention also provides a primary air adjusting device based on pulverized coal burner nozzle temperature measurement, which comprises a temperature measuring unit, a primary air adjusting unit, a data acquisition module and a control unit, wherein the temperature measuring unit comprises a temperature measuring gun arranged along the nozzle jet flow direction of the pulverized coal burner, a plurality of temperature measuring elements are arranged on the temperature measuring gun, the primary air adjusting unit comprises an adjusting valve arranged on a primary air pipe and a driving motor used for driving and adjusting the adjusting valve, the output end of the temperature measuring element is connected with the control unit through the data acquisition module, the control end of the driving motor is connected with the control unit, and the control unit is programmed or configured to execute the steps of the primary air adjusting method based on pulverized coal burner nozzle temperature measurement.
Optionally, the temperature measuring gun is connected with a linear driving mechanism for driving the temperature measuring gun to make linear motion along the jet flow direction of the nozzle of the pulverized coal burner.
Optionally, the plurality of temperature measuring elements arranged on the temperature measuring gun are respectively arranged on a temperature measuring section on the temperature measuring gun along a straight line, the length of the temperature measuring section is equal to the stroke of the straight line driving mechanism, when the straight line driving mechanism drives the temperature measuring gun to be inserted into the pulverized coal burner along the jet flow direction of the nozzle of the pulverized coal burner, the outermost temperature measuring element is flush with the edge of the pulverized coal burner, and when the straight line driving mechanism drives the temperature measuring gun to exit from the pulverized coal burner along the jet flow direction of the nozzle of the pulverized coal burner, the innermost temperature measuring element is flush with the edge of the pulverized coal burner.
Optionally, the linear driving mechanism is provided with limit switches at two ends of the stroke, and output ends of the limit switches are connected with the control unit respectively.
Optionally, the temperature measuring gun is of a hollow structure, the outer side of the temperature measuring gun is provided with a compressed air input pipe used for being connected with a compressed air source, the inner end of the temperature measuring gun is provided with an exhaust port used for exhausting compressed air into the hearth, and the compressed air input pipe is provided with an air valve.
Optionally, the outer wall of the temperature measuring gun is provided with a plurality of temperature measuring piles arranged perpendicular to the temperature measuring gun, and the temperature measuring element is installed at the end of the temperature measuring pile.
In addition, the invention also provides a pulverized coal combustion device which comprises a furnace wall and a pulverized coal burner arranged on the furnace wall, wherein the pulverized coal burner is connected with the primary air pipe, and the pulverized coal burner is also provided with the primary air adjusting device based on the temperature measurement of the nozzle of the pulverized coal burner.
Compared with the prior art, the invention mainly has the following advantages: the method comprises the steps of detecting the temperature distribution of the jet flow direction of a nozzle of the pulverized coal burner; finding the ignition position of the pulverized coal airflow according to the temperature distribution; the distance between the ignition position of the pulverized coal airflow and the pulverized coal burner is judged to be smaller than a first preset threshold value or not, if yes, the primary air speed is increased, so that the distance between the ignition position of the warm pulverized coal airflow and the pulverized coal burner is not smaller than the first preset threshold value, whether the current coal combustion characteristic is matched with the primary air speed or not can be judged through temperature distribution, the risks of fire extinguishing and a fire nozzle of the burner are effectively reduced, the adaptability of the burner to the coal is improved, and guidance can be provided for operators to adjust the primary air speed or the primary air pressure.
Drawings
FIG. 1 is a schematic diagram of a basic flow of a method according to an embodiment of the present invention.
FIG. 2 is an example of the temperature distribution of the jet direction of the nozzle of the pulverized coal burner detected in the embodiment of the present invention.
Fig. 3 is a schematic diagram of a basic structure of an apparatus according to an embodiment of the present invention.
Detailed Description
The present invention is described in detail below with reference to examples, and it should be understood that the specific examples described herein are for purposes of illustration only and are not intended to limit the invention.
As shown in fig. 1, the primary air adjusting method based on the pulverized coal burner nozzle temperature measurement in the embodiment includes:
1) detecting the temperature distribution of the jet flow direction of the nozzle of the pulverized coal burner, referring to fig. 2;
2) finding the ignition position of the pulverized coal airflow according to the temperature distribution;
3) the distance between the ignition position of the pulverized coal airflow and the pulverized coal burner is judged to be smaller than a first preset threshold value or not, if yes, the primary air speed is increased, the distance between the ignition position of the pulverized coal airflow and the pulverized coal burner is not smaller than the first preset threshold value, therefore, whether the current coal combustion characteristic is matched with the primary air speed or not can be judged through temperature distribution, the risks of fire extinguishing and a fire nozzle of the burner are effectively reduced, the adaptability of the burner to the coal is improved, and guidance can be provided for operators to adjust the primary air speed or the primary air pressure.
After the pulverized coal is fed into a hearth, the pulverized coal is dried, the volatile matter is analyzed, the volatile matter is ignited and combusted, and the temperature of pulverized coal jet flow (primary air) is increased step by step along with the development of each stage in the stage of combustion of the volatile matter and the coke, as shown in fig. 2, wherein the temperature step occurs at the 6 th point, namely the 6 th point is the ignition position of the pulverized coal airflow. Under certain a wind speed, it is good when the coal type characteristic of catching fire, catch fire can be in advance, the volatile of buggy air current and the position that the burning of coke catches fire takes place temperature step can be close to the spout of pulverized coal burner, can have the risk of burning the burner this moment, the accessible increases a wind speed, postpones to catch fire to play the purpose that prevents the risk of burning the burner, applicable in the coal type of different characteristics of catching fire, can provide the guidance for a wind speed of operating personnel adjustment or a wind pressure.
Further, when the ignition characteristics of coal are poor, the temperature step position of the temperature step generated by the ignition combustion of the coke and the volatile matter in the pulverized coal airflow are far away from the nozzle of the pulverized coal burner, so that the risk of fire dropping is avoided. In order to solve the above technical problem, in this embodiment, the step 3) further includes, when the wind speed of the primary wind is greater than a calibrated value for ensuring the carrying capacity of the pulverized coal, determining whether a distance between the ignition position of the pulverized coal steam and the pulverized coal burner is greater than or equal to a second preset threshold, and if so, reducing the primary wind speed, where the second preset threshold is greater than the first preset threshold.
As an optional implementation manner, in step 3) of this embodiment, when ignition positions of pulverized coal airflows of a plurality of pulverized coal burners in the same pulverizing system are inconsistent, a purpose of matching a primary air speed of each pulverized coal pipe with a combustion condition of the pulverized coal airflow is achieved by adjusting a primary air speed corresponding to each pulverized coal burner. When the wind speed between the primary wind pipes of the same powder making system has deviation, the wind speed can be reflected by the temperature distribution in the jet flow direction of the pulverized coal airflow, so that the method can also be used for adjusting the primary wind speed of each powder pipe to be matched with the combustion condition of the pulverized coal airflow based on the ignition position of the pulverized coal airflow.
As an alternative implementation manner, the step 1) of detecting the temperature distribution in the jet flow direction of the pulverized coal burner nozzles in the embodiment refers to detecting the temperature distribution in the jet flow direction of the pulverized coal burner nozzles by a plurality of temperature sensors arranged along the jet flow direction of the pulverized coal burner nozzles.
As shown in fig. 3, the embodiment further provides a primary air adjusting device based on pulverized coal burner nozzle temperature measurement, which includes a temperature measuring unit, a primary air adjusting unit, a data acquisition module 10 and a control unit 4, where the temperature measuring unit includes a temperature measuring gun 1 arranged along the nozzle jet direction of the pulverized coal burner 3, the temperature measuring gun 1 is provided with a plurality of temperature measuring elements 2, the primary air adjusting unit includes an adjusting valve 5 arranged on a primary air pipe 7 and a driving motor 6 for driving and adjusting the adjusting valve 5, an output end of the temperature measuring element 2 is connected with the control unit 4 through the data acquisition module 10, a control end of the driving motor 6 is connected with the control unit 4, and the control unit 4 is programmed or configured to execute the steps of the primary air adjusting method based on pulverized coal burner nozzle temperature measurement. The arrangement of the temperature measuring gun 1 is provided with the temperature measuring element 2, the temperature measuring element 2 is connected with the control unit 4, when measurement is carried out, the temperature measuring element 2 is directly contacted with high-temperature flue gas, a flue gas temperature value is fed back to the control unit 4, the control unit 4 obtains the nozzle temperature distribution of the pulverized coal burner 3 in real time, the nozzle temperature distribution of the pulverized coal burner can be monitored in real time, and guidance is provided for operators to adjust the adjustable shrinkage cavity of the primary air pipe. A plurality of measuring elements 2 can be arranged according to the needs, and more than three measuring elements are suggested to be arranged, so that the temperature distribution of the jet flow direction of the pulverized coal airflow is obtained.
As shown in fig. 3, the temperature measuring gun 1 of the present embodiment is connected to a linear driving mechanism 8 for driving the temperature measuring gun 1 to move linearly along the jet direction of the nozzle of the pulverized coal burner 3, and the temperature measuring gun 1 can be driven by the linear driving mechanism 8 and can horizontally move back and forth along the axial direction (the jet direction of the nozzle of the pulverized coal burner 3) as required for putting into or taking out of service. It should be noted that the linear driving mechanism 8 may be any of various conventional linear driving devices, such as a linear motor, as required. As an alternative embodiment, in the present embodiment, the linear driving mechanism 8 includes a motor, a speed reducer and a turbine screw assembly, and after the driving torque of the motor is reduced by the speed reducer, the circular motion is converted into the horizontal motion of the temperature measuring gun 1 by the turbine screw assembly.
As shown in fig. 3, a plurality of temperature measuring elements 2 provided on the temperature measuring gun 1 of the present embodiment are respectively arranged on a temperature measuring section on the temperature measuring gun 1 along a straight line, the length of the temperature measuring section is equal to the stroke of the linear driving mechanism 8, when the linear driving mechanism 8 drives the temperature measuring gun 1 to be inserted into the pulverized coal burner 3 along the jet flow direction of the nozzle of the pulverized coal burner 3, the outermost temperature measuring element 2 is flush with the edge of the pulverized coal burner 3, and when the linear driving mechanism 8 drives the temperature measuring gun 1 to exit from the pulverized coal burner 3 along the jet flow direction of the nozzle of the pulverized coal burner 3, the innermost temperature measuring element 2 is flush with the edge of the pulverized coal burner 3.
As an alternative embodiment, in the present embodiment, the linear driving mechanism 8 is provided with limit switches at two ends of the stroke, and output ends of the limit switches are respectively connected to the control unit 4.
Referring to fig. 3, in this embodiment, the temperature measuring gun 1 is a hollow structure, the outside of the temperature measuring gun 1 is provided with a compressed air input pipe for connecting with a compressed air source, the inner end of the temperature measuring gun 1 is provided with an exhaust port for exhausting compressed air into the furnace, the compressed air input pipe is provided with an air valve 9, when the temperature measuring gun 1 is put into use, the compressed air can be introduced to cool the temperature measuring gun body of the temperature measuring gun 1, and the temperature measuring gun 1 is ensured not to be burned out when contacting high-temperature flue gas in the measuring process.
In this embodiment, be equipped with the temperature measurement stake that a plurality of perpendicular to temperature measurement rifle 1 arranged on the outer wall of temperature measurement rifle 1, temperature measurement element 2 installs the tip at the temperature measurement stake, can prevent the influence of body temperature of temperature measurement rifle 1 to measuring result. In this embodiment, the plurality of temperature measuring elements 2 are uniformly distributed, the distance between the temperature measuring elements 2 is 100mm, and the temperature measuring pile extends out by about 30 mm.
In this embodiment, the temperature measuring element 2 is a thermocouple.
In this embodiment, the control unit 4 is configured to collect a measurement value of the temperature measuring element 2 and display the measurement value in real time, the control unit 4 is connected to the driving motor 6 configured to drive the adjusting valve 5, and is configured to send a control instruction to the driving motor 6, and the driving motor 6 receives the instruction from the control unit 4 and respectively controls the adjusting valve 5 to move to adjust the flow cross-sectional area. In addition, the control unit 4 in this embodiment integrates a communication module, which can be used to implement remote control.
In this embodiment, the adjusting valve 5 is an adjustable shrinkage cavity, and the control unit 4 is connected with a driving motor 6 for driving and adjusting the adjustable shrinkage cavity, and can send a control instruction to the driving motor 6; the driving motor 6 receives the instruction of the control unit 4, respectively drives the two semi-circular plates of the adjustable shrinkage cavity to move, and adjusts the flow cross section area of the shrinkage cavity, thereby realizing the adjustment of the primary wind speed.
The working principle of the primary air adjusting device based on the pulverized coal burner nozzle temperature measurement in the embodiment is as follows: the temperature signal of the temperature measuring element 2 is sent to the control unit 4 through the data acquisition module 10. The temperature distribution of the jet flow direction of the pulverized coal airflow is displayed in the control unit 4 in a curve mode, in a manual mode, an operator can judge the ignition condition of the pulverized coal airflow according to the temperature distribution, and then the control unit 4 adjusts the adjusting valve 5 as required; in the automatic mode, the control unit 4 then automatically adjusts the regulating valve 5. The driving motor 6 receives the instruction of the control unit 4 and adjusts the adjusting valve 5, so that the circulation resistance of the primary air pipe is adjusted, and the purpose of adjusting the air speed is achieved. Compressed air is sent into the temperature measuring gun 1 through the hose through the air valve 9, and the compressed air after cooling the body of the temperature measuring gun 1 is directly discharged into the hearth. The risk that the combustor puts out a fire and burns the burner can be effectively reduced, the adaptability of combustor to the coal type is improved, can provide the guidance for the adjustment of a wind speed or a wind pressure of operation personnel.
In addition, referring to fig. 3, the present embodiment further provides a pulverized coal combustion apparatus, which includes a furnace wall 11 and a pulverized coal burner 3 installed on the furnace wall 11, wherein the pulverized coal burner 3 is connected to the primary air duct 7, and the pulverized coal burner 3 is further provided with the primary air adjusting device based on the pulverized coal burner nozzle temperature measurement in the present embodiment. The number of the pulverized coal burners 3 can be one or more, and when the number is more than one, the primary air speed of each pulverized coal pipe can be adjusted to match the combustion condition of the pulverized coal airflow based on the ignition position of the pulverized coal airflow.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. A primary air adjusting method based on pulverized coal burner nozzle temperature measurement is characterized by comprising the following steps:
1) detecting the temperature distribution of the jet flow direction of a nozzle of the pulverized coal burner;
2) finding the ignition position of the pulverized coal airflow according to the temperature distribution;
3) and judging whether the distance between the ignition position of the pulverized coal airflow and the combustor is smaller than a first preset threshold value, if so, increasing the primary air speed, and enabling the distance between the ignition position and the combustor not to be smaller than the preset threshold value.
2. The primary air adjusting method based on pulverized coal burner nozzle temperature measurement as claimed in claim 1, characterized in that the step 3) further comprises judging whether the distance between the pulverized coal stream ignition position and the pulverized coal burner is greater than or equal to a second preset threshold value or not under the condition that the primary air speed is greater than a calibration value for ensuring pulverized coal carrying capacity, and if so, reducing the primary air speed, wherein the second preset threshold value is greater than the first preset threshold value.
3. The primary air adjusting method based on pulverized coal burner nozzle temperature measurement according to claim 1, characterized in that step 3) further comprises adjusting primary air speed corresponding to each pulverized coal burner to achieve the purpose of matching the primary air speed of each pulverized coal pipe with the pulverized coal airflow combustion condition under the condition that ignition positions of pulverized coal airflows of a plurality of pulverized coal burners under the same pulverizing system are inconsistent.
4. A primary air adjusting device based on pulverized coal burner nozzle temperature measurement is characterized by comprising a temperature measuring unit, a primary air adjusting unit, a data acquisition module (10) and a control unit (4), the temperature measuring unit comprises a temperature measuring gun (1) arranged along the jet flow direction of a nozzle of the pulverized coal burner (3), a plurality of temperature measuring elements (2) are arranged on the temperature measuring gun (1), the primary air adjusting unit comprises an adjusting valve (5) arranged on a primary air pipe (7) and a driving motor (6) used for driving and adjusting the adjusting valve (5), the output end of the temperature measuring element (2) is connected with the control unit (4) through a data acquisition module (10), the control end of the drive motor (6) is connected to a control unit (4), the control unit (4) being programmed or configured to perform the steps of the primary air regulation method based on pulverized coal burner throat temperature measurement according to any one of claims 1 to 3.
5. The primary air adjusting device based on pulverized coal burner nozzle temperature measurement as claimed in claim 4, characterized in that the temperature measuring gun (1) is connected with a linear driving mechanism (8) for driving the temperature measuring gun (1) to do linear motion along the nozzle jet flow direction of the pulverized coal burner (3).
6. The primary air adjusting device based on pulverized coal burner nozzle temperature measurement according to claim 5, characterized in that a plurality of temperature measuring elements (2) arranged on the temperature measuring gun (1) are respectively arranged on a temperature measuring section on the temperature measuring gun (1) along a straight line, the length of the temperature measuring section is equal to the stroke of the linear driving mechanism (8), when the linear driving mechanism (8) drives the temperature measuring gun (1) to be inserted into the pulverized coal burner (3) along the nozzle jet direction of the pulverized coal burner (3), the outermost temperature measuring element (2) is flush with the edge of the pulverized coal burner (3), and when the linear driving mechanism (8) drives the temperature measuring gun (1) to exit from the pulverized coal burner (3) along the nozzle jet direction of the pulverized coal burner (3), the innermost temperature measuring element (2) is flush with the edge of the pulverized coal burner (3).
7. Primary air regulating device based on pulverized coal burner nozzle temperature measurement according to claim 6, characterized in that the linear driving mechanism (8) is provided with limit switches at both ends of the stroke, and the output ends of the limit switches are connected with the control unit (4) respectively.
8. The primary air adjusting device based on pulverized coal burner nozzle temperature measurement as claimed in claim 7, characterized in that the temperature measuring gun (1) is hollow and has a compressed air input pipe for connecting with a compressed air source, an exhaust port for exhausting compressed air into a furnace chamber at the inner end, and an air valve (9) is arranged on the compressed air input pipe.
9. The primary air adjusting device based on pulverized coal burner nozzle temperature measurement as claimed in claim 8, characterized in that the outer wall of the temperature measuring gun (1) is provided with a plurality of temperature measuring piles arranged perpendicular to the temperature measuring gun (1), and the temperature measuring element (2) is installed at the end of the temperature measuring piles.
10. A pulverized coal combustion device comprises a furnace wall (11) and a pulverized coal burner (3) installed on the furnace wall (11), wherein the pulverized coal burner (3) is connected with a primary air pipe (7), and the pulverized coal combustion device is characterized in that the pulverized coal burner (3) is further provided with a primary air adjusting device based on pulverized coal burner nozzle temperature measurement according to any one of claims 4-9.
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| CN202110649181.0A CN113418206A (en) | 2021-06-10 | 2021-06-10 | Primary air adjusting method and device based on pulverized coal burner nozzle temperature measurement |
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Application publication date: 20210921 |