CN216524438U - Hearth soot blowing sound wave temperature measurement system - Google Patents
Hearth soot blowing sound wave temperature measurement system Download PDFInfo
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- CN216524438U CN216524438U CN202122851731.5U CN202122851731U CN216524438U CN 216524438 U CN216524438 U CN 216524438U CN 202122851731 U CN202122851731 U CN 202122851731U CN 216524438 U CN216524438 U CN 216524438U
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Abstract
The utility model relates to a hearth soot blowing sound wave temperature measuring system, which comprises: the device comprises a sound wave soot blower, a sound wave detection module and a monitoring and control integrated machine; the sound wave soot blower is arranged on a wall wrapping pipe of the boiler; the sound wave detection module is arranged in the fire detection air channel of each layer of the boiler; the sound wave detection module is connected with the monitoring and control all-in-one machine; the sound wave detection module is used for receiving sound waves emitted by the sound wave soot blower and converting the sound waves into sound wave electric signals; the monitoring and control all-in-one machine is used for determining the temperature distribution in the full combustion channel of the boiler according to the sound wave electric signal; the monitoring and controlling integrated machine is also connected with the sound wave soot blower; and the monitoring and controlling integrated machine is also used for controlling the sound wave soot blower to perform soot blowing according to the temperature distribution. The utility model can realize the three-dimensional high-precision measurement of the temperature of the hearth.
Description
Technical Field
The utility model relates to the field of boiler soot blowing, in particular to a hearth soot blowing sound wave temperature measurement system.
Background
In recent years, large-scale energy-saving and environment-friendly comprehensive promotion and ultralow emission reconstruction projects are carried out on coal-fired boiler units in China, and the units which have capacity after shutdown and do not meet the requirements of relevant mandatory standards are continuously eliminated.
The biggest problem of boiler operation under the condition of deep peak regulation of 30% MCR is the problem of stable combustion, and at the moment, a large coke can hit the fire, and recently, the fire extinguishing cases due to coke dropping are more and more. The reasons for the boiler body are that the flame moves upwards after the low-nitrogen combustor is transformed, oxygen deficiency combustion is caused, and secondary air is insufficient in oxygen supply. The reasons in the aspect of thermotechnical technology are that the flame combustion detection function is insufficient, the flame detection (four-corner tangential firing furnace) is influenced by the swinging of the fire detection optical fiber along with the swing angle, the phenomenon of 'peeping' is generally existed in the fire detection, the flame detection is insensitive and inaccurate, the secondary air is difficult to be input due to the lack of flame observation parameters, the fire extinguishing protection logic of the FSSS is incomplete, the phenomenon of coke falling in the furnace is avoided, and the detection means and the like are also lacked in the aspect of thermotechnical technology. The reasons for the fuel include that coal blending combustion is common, the coal blending combustion deviates from the designed coal types and working conditions, some coal blending combustion in furnaces adopts various coal types, secondary air cannot be regulated, the firing distances of various burners are different, and the like. The above problems present a significant challenge to boiler combustion stability under deep peak shaving.
Improving the boiler combustion efficiency is always an important subject of research of various power generation enterprises, however, improving the boiler efficiency requires a deeper understanding of the combustion condition inside the furnace, so the furnace temperature is a very intuitive operation parameter. Currently, coal-electricity enterprises are facing a number of problems and challenges:
1. low-nitrogen modification: the low-nitrogen burner of the coal-fired boiler is transformed, the temperature field and the air quantity ratio in the boiler are changed greatly, the combustion working condition in the transformed boiler has great deviation from the original design working condition, and an effective monitoring means is lacked.
2. Blending and burning of multiple coal types: the economic requirement of coal and electricity enterprises, and a large amount of mixed combustion, mixed combustion and deep peak shaving of a unit cause unstable combustion of a boiler.
The traditional hearth temperature measuring device mainly comprises a contact type and a non-contact type.
Wherein the contact mainly comprises a thermocouple and a hearth smoke temperature probe. Although simple and reliable, the measurement is intuitive; but only can realize point measurement, the measurement temperature is limited, and continuous monitoring cannot be realized.
Non-contact type is mainly 1. laser measurement: the defects are that the laser equipment consumes huge energy, the cost is higher, the laser is low in measurement resolution along linear propagation, and the measurement of the section temperature is difficult to realize by a few measuring points. 2. Hearth flame TV: the combustion conditions in the furnace can be seen: whether to extinguish a fire; quantitative temperature information cannot be obtained. 3. Infrared temperature measurement: measuring the infrared light intensity of a surface or area; the handheld type flame temperature measuring device can only measure the temperature of the flame center because the flue gas of a hearth emits light in a gaseous state, the temperature distribution is uneven, the components are not fixed, and in addition, the existence of dust fly ash particles is added, so that the spectral wavelength, the penetrating power and the like of the components are uncertain, the measured area is uncertain, and the measurement error is large.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a hearth soot blowing sound wave temperature measuring system to realize three-dimensional high-precision measurement of hearth temperature.
In order to achieve the purpose, the utility model provides the following scheme:
a hearth soot blowing sound wave temperature measuring system comprises: the device comprises a sound wave soot blower, a sound wave detection module and a monitoring and control integrated machine;
the sound wave soot blower is arranged on a wall wrapping pipe of the boiler; the sound wave detection module is arranged in the fire detection air channel of each layer of the boiler; the sound wave detection module is connected with the monitoring and control all-in-one machine; the sound wave detection module is used for receiving sound waves emitted by the sound wave soot blower and converting the sound waves into sound wave electric signals; the monitoring and control all-in-one machine is used for determining the temperature distribution in the full combustion channel of the boiler according to the sound wave electric signal; the monitoring and controlling integrated machine is also connected with the sound wave soot blower; and the monitoring and controlling integrated machine is also used for controlling the sound wave soot blower to perform soot blowing according to the temperature distribution.
Optionally, the acoustic wave detection module includes an acoustic wave probe and an acoustic wave detector; the sound wave probe is used for receiving sound waves emitted by the sound wave soot blower and transmitting the sound waves to the sound wave detector; and the sound wave detector is connected with the monitoring and controlling all-in-one machine.
Optionally, the acoustic wave probe is provided with a plurality of acoustic wave probes, and the plurality of acoustic wave probes are arranged at one or more positions of a hearth of a full combustion flue in the pan, a SOFA air layer, a horizontal flue or a tail flue.
Optionally, the data interface of the acoustic wave detector is a twisted pair communication interface.
Optionally, the sound wave soot blower is welded on a wall wrapping pipe of the boiler.
Optionally, the monitoring host and the embedded control host include eight switching value output control modules; and the eight-path switching value output control module is connected with the wave detection module.
Optionally, the monitoring and control all-in-one machine further includes a monitoring host and an embedded control host; the monitoring host is used for determining the temperature distribution in the full combustion channel of the boiler according to the sound wave electric signal; the embedded control host is used for controlling the sound wave soot blower to perform soot blowing according to the temperature distribution.
Optionally, the embedded control host further includes a comparator and a control module; the comparator is used for comparing the temperature distribution with a set temperature range to obtain a comparison result; and the control module is used for controlling the sound wave soot blower to blow soot when the comparison result shows that the temperature distribution exceeds a set temperature range.
According to the specific embodiment provided by the utility model, the utility model discloses the following technical effects:
the hearth soot blowing sound wave temperature measuring system provided by the utility model has the advantages that the sound wave soot blower is arranged on a wall wrapping pipe of a boiler; the sound wave detection module is arranged in the fire detection air channel of each layer of boiler; the sound wave detection module is connected with the monitoring and control all-in-one machine; the sound wave detection module is used for receiving sound waves emitted by the sound wave soot blower and converting the sound waves into sound wave electric signals; the monitoring and controlling integrated machine is used for determining the temperature distribution in the full combustion channel of the boiler according to the sound wave electric signal; the monitoring and controlling integrated machine is also connected with the sound wave soot blower; the monitoring and controlling integrated machine is also used for controlling the sound wave soot blower to perform soot blowing according to the temperature distribution. The temperature measurement is carried out through sound waves, the measurement space is not limited, the influence of factors such as radiation is avoided, and the measurement precision is high.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic structural view of a hearth soot blowing sound wave temperature measurement system provided by the present invention;
FIG. 2 is a schematic view of a full combustion path of a hearth soot blowing sound wave temperature measurement system provided by the utility model;
fig. 3 is a propagation path diagram of an acoustic wave.
Description of the symbols:
1-sound wave soot blower, 2-sound wave probe, 3-sound wave detector, 4-monitoring and controlling integrated machine.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The utility model aims to provide a hearth soot blowing sound wave temperature measuring system to realize three-dimensional high-precision measurement of hearth temperature.
The acoustic wave temperature measurement principle realizes temperature measurement based on the characteristic that the propagation speed of acoustic waves changes along with the temperature change. The average transit time along the path is determined by measuring the time difference between the point of departure and the point of receipt of the sound wave. When the hearth burns, the sound wave propagation path is lengthened, and the transmission time also needs to correct the delay effect of the wind speed.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, the present invention provides a hearth soot blowing sound wave temperature measuring system, which includes: the device comprises a sound wave soot blower 1, a sound wave detection module and a monitoring and control integrated machine 4.
The acoustic soot blower 1 is arranged on a wall wrapping pipe of the boiler; the sound wave detection module is arranged in the fire detection air channel of each layer of the boiler; the sound wave detection module is connected with the monitoring and control all-in-one machine 4; the sound wave detection module is used for receiving the sound waves emitted by the sound wave soot blower 1 and converting the sound waves into sound wave electric signals; the monitoring and control integrated machine 4 is used for determining the temperature distribution in the full combustion channel of the boiler according to the sound wave electric signal; the monitoring and controlling integrated machine 4 is also connected with the sound wave soot blower 1; the monitoring and controlling integrated machine 4 is also used for controlling the sound wave soot blower 1 to perform soot blowing according to the temperature distribution.
In practical application, the acoustic wave detection module comprises an acoustic wave probe 2 and an acoustic wave detector 3; the sound wave probe 2 is used for receiving the sound wave emitted by the sound wave soot blower 1 and transmitting the sound wave to the sound wave detector 3; the sound wave detector 3 is connected with the monitoring and control all-in-one machine 4.
In practical application, the plurality of sound wave probes 2 are arranged, and the plurality of sound wave probes 2 are arranged at one or more positions of a hearth of a full combustion flue in the pan, a SOFA wind layer, a horizontal flue or a tail flue.
In practical applications, the data interface of the acoustic wave detector 3 is a twisted pair communication interface.
In practical application, the sound wave soot blower 1 is welded on a wall wrapping pipe of the boiler.
In practical application, the monitoring host and the embedded control host comprise eight switching value output control modules; and the eight-path switching value output control module is connected with the wave detection module.
In practical application, the monitoring and control all-in-one machine 4 further comprises a monitoring host and an embedded control host; the monitoring host is used for determining the temperature distribution in the full combustion channel of the boiler according to the sound wave electric signal; the embedded control host is used for controlling the sound wave soot blower 1 to perform soot blowing according to the temperature distribution.
In practical application, the embedded control host further comprises a comparator and a control module; the comparator is used for comparing the temperature distribution with a set temperature range to obtain a comparison result; and the control module is used for controlling the sound wave soot blower 1 to blow soot when the comparison result shows that the temperature distribution exceeds a set temperature range.
As shown in figure 2, the utility model can realize the temperature distribution measurement of the A area of the main combustion area of the hearth by setting the sound wave detection points on the bottom layer and the middle SOFA wind layer of the hearth, can realize the temperature distribution of the B area of the edge-covering corner area by the sound wave detection points of the SOFA wind layer and the horizontal flue, can realize the temperature distribution of the C area of the horizontal flue by the sound wave detection points of the horizontal flue, can realize the temperature distribution of the lower turning area by the sound wave detection points of the horizontal flue and the tail flue, and can realize the temperature distribution of the E area by the sound wave detection points of the tail flue. Therefore, the temperature distribution measurement of the full combustion path can be realized. The utility model is characterized in that two sound wave probes (2) of A-1 and A-4 are arranged at the bottom of a hearth, two sound wave probes (2) of AB-1 and AB-4 are arranged at a middle SOFA wind layer, four sound wave probes (2) of B-1, B-4, C-1 and C-4 are arranged at a horizontal flue, and four sound wave probes (2) of D-1, D-4, E-1 and E-4 are arranged at a tail flue. In practical application, the position and the number of the acoustic wave probes can be determined according to the practical situation of the utility boiler.
The system uses the noise of the soot blower during soot blowing as a measurement sound source, and can measure the temperature of each area in a partitioned mode.
If only the temperature of the hearth needs to be measured, the sound wave anechoic wave probes 2 can be respectively arranged on the bottom layer burner (4) and the SOFA wind layer (4), and the three-dimensional temperature measurement of the hearth can be realized.
1) Sound wave soot blower 1
The sound is very loud when soot blowing is performed, and the noise can be used as a sound source for acoustic temperature measurement. Only one sound source is allowed during sound wave measurement, so that a plurality of soot blowers cannot simultaneously blow soot. The starting control instruction of the soot blower is connected to the measuring unit, and the measuring unit can determine the position of the sound source. Although two acoustic wave soot blowers are arranged in the wave propagation path of the acoustic wave as shown in fig. 3, only one acoustic wave soot blower is operated during actual temperature measurement operation. In order to make the temperature measurement in the actual boiler more accurate, each sound wave soot blower must be operated in turn.
2) Acoustic wave probe 2
The hearth area sound wave probe 2 is arranged in the fire detection air channel and is cooled by secondary air. Each probe converts the sound intensity signal into a current signal, and the detection processing is performed by the acoustic wave detector 3. Wherein, the sound wave probe includes 10 way output terminals of transverse wave.
3) Acoustic wave detector 3
Each sound wave detector 3 can simultaneously input eight paths of sound signals, the output is a twisted-pair communication interface, the twisted-pair communication interface is networked with a background host, the working power supply is 24VDC, and the shape of the module is vertically arranged on a guide rail or a terminal box base. Wherein each acoustic wave detector 3 comprises 10 inputs for transverse waves.
4) Monitoring and controlling integrated machine 4
A 10 inch touch screen all-in-one machine comprising: a monitoring host and an embedded control host. The monitoring and control integrated machine 4 is provided with eight switching value output control modules. Each eight-path switching value output control module can realize eight-path switching value output, a communication interface is Tbus, the communication interface is networked with a background control host, a working power supply is 24VDC, and the appearance of the module is arranged on a guide rail or a base of a terminal box in a vertical mode.
Embedded control host parameters:
a working power supply: +5VDC, two paths
A CPU module: 5x86-800MHz
Ethernet network interface: 100Mbps, 2
An RS485 interface: 1 is provided with
An RS232 interface: 1 piece of
A Tbus interface: 1 (connected acoustic wave detector 3).
The sound wave soot blower 1 is installed on a hearth wall-wrapping pipe in a welding mode, when the sound wave soot blower 1 blows soot, sound waves are emitted and are received by a sound wave probe 2 installed on a fire detection air channel and transmitted to a sound wave detector 3 (input end), the sound wave detector 3 detects the sound intensity of sound signals and converts the sound signals into electric signals to be transmitted to an eight-way switching value output control module (output end), the electric signals are transmitted to a monitoring and control integrated machine 4, and the propagation time of the sound signals from the sound wave generator to the sound wave probe 2 is obtained through calculation and analysis of control software. Thereby obtaining the sound wave propagation speed and further obtaining the temperature condition on the sound signal propagation path. The devices are connected by cables.
The propagation speed of the acoustic wave changes with the change in the temperature of the medium. The relationship between the sound wave propagation speed and the medium temperature is obtained by a gas equation in thermodynamics and a sound wave equation in acoustics as follows:
C＝f(K,R,M,T)
c-speed of propagation of sound in a medium
R-gas constant
k-adiabatic index of gas
M-molecular weight of gas
T-gas temperature
Thus, the temperature of the medium can be calculated.
The utility model relates to a hearth soot blowing sound wave temperature measuring system which is used for effectively blowing soot in a soot deposition area of a power station boiler and monitoring the temperature in a hearth. The temperature measuring system uploads the temperature condition in the hearth to the monitoring and control all-in-one machine 4, and the temperature is analyzed to obtain the ash deposition condition in the region and control the action of the soot blower. The system provided by the utility model has high precision and is not influenced by factors such as radiation and the like; the measuring temperature range is wide and can be used in the full load range of the boiler; the measurement space is not limited, the average temperature can be measured, and the temperature field distribution of the hearth can be measured; the method has the advantages of high measurement sensitivity, good real-time performance and good maintainability.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the utility model.
Claims (8)
1. The utility model provides a furnace blows grey sound wave temperature measurement system which characterized in that includes: the device comprises a sound wave soot blower, a sound wave detection module and a monitoring and control integrated machine;
the sound wave soot blower is arranged on a wall wrapping pipe of the boiler; the sound wave detection module is arranged in the fire detection air channel of each layer of the boiler; the sound wave detection module is connected with the monitoring and control all-in-one machine; the sound wave detection module is used for receiving sound waves emitted by the sound wave soot blower and converting the sound waves into sound wave electric signals; the monitoring and control all-in-one machine is used for determining the temperature distribution in the full combustion channel of the boiler according to the sound wave electric signal; the monitoring and controlling integrated machine is also connected with the sound wave soot blower; and the monitoring and controlling integrated machine is also used for controlling the sound wave soot blower to perform soot blowing according to the temperature distribution.
2. The furnace soot blowing sonic temperature measurement system of claim 1, wherein the sonic detection module comprises a sonic probe and a sonic detector; the sound wave probe is used for receiving sound waves emitted by the sound wave soot blower and transmitting the sound waves to the sound wave detector; and the sound wave detector is connected with the monitoring and controlling all-in-one machine.
3. The hearth soot blowing sound wave temperature measuring system of claim 2, wherein a plurality of sound wave probes are arranged in one or more of a hearth of a full combustion flue, a SOFA wind layer, a horizontal flue or a tail flue in the boiler.
4. The hearth soot blowing sonic temperature measurement system of claim 2, wherein the data interface of the sonic detector is a twisted pair communication interface.
5. The hearth soot blowing sonic temperature measurement system of claim 1, wherein the sonic soot blower is welded to a wrapper tube of the boiler.
6. The hearth soot blowing sound wave temperature measurement system according to claim 1, wherein the monitoring and control all-in-one machine comprises an eight-way switching value output control module; and the eight-path switching value output control module is connected with the sound wave detection module.
7. The hearth soot blowing sound wave temperature measurement system according to claim 1, wherein the monitoring and control all-in-one machine further comprises a monitoring host and an embedded control host; the monitoring host is used for determining the temperature distribution in the full combustion channel of the boiler according to the sound wave electric signal; the embedded control host is used for controlling the sound wave soot blower to perform soot blowing according to the temperature distribution.
8. The hearth soot blowing acoustic temperature measurement system according to claim 7, wherein the embedded control host further comprises a comparator and a control module; the comparator is used for comparing the temperature distribution with a set temperature range to obtain a comparison result; and the control module is used for controlling the sound wave soot blower to blow soot when the comparison result shows that the temperature distribution exceeds a set temperature range.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113945298A (en) * | 2021-11-20 | 2022-01-18 | 陕西岱南新能源工程有限公司 | Hearth soot blowing sound wave temperature measurement system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113945298A (en) * | 2021-11-20 | 2022-01-18 | 陕西岱南新能源工程有限公司 | Hearth soot blowing sound wave temperature measurement system |
| NL2033521A (en) * | 2021-11-20 | 2023-06-13 | Shaanxi Dainan New Energy Eng Co Ltd | Acoustic pyrometry system for furnace soot blowing |
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