CN109270294A - A kind of online detection of primary air system and measurement method - Google Patents
A kind of online detection of primary air system and measurement method Download PDFInfo
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- CN109270294A CN109270294A CN201811398416.8A CN201811398416A CN109270294A CN 109270294 A CN109270294 A CN 109270294A CN 201811398416 A CN201811398416 A CN 201811398416A CN 109270294 A CN109270294 A CN 109270294A
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- coal
- primary air
- online detection
- coal dust
- air system
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/18—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance
- G01P5/20—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance using particles entrained by a fluid stream
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/0656—Investigating concentration of particle suspensions using electric, e.g. electrostatic methods or magnetic methods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
Abstract
A kind of online detection of primary air system, it is provided at least two electrostatic transducer units, the output end of each electrostatic transducer unit is connect with the input terminal of advance signal processing unit, the output end of the advance signal processing unit connects composition Ethernet through interchanger, and the DCS/SIS system of at least a host computer and power plant is also connected on the Ethernet.The present invention solves original wind powder measuring system sensor and is easily worn, and is unable to complete the drawbacks of monitoring on-line for a long time, meanwhile, electrostatic transducer can be located at pipeline outer wall, to overhaul, replacing the approach provided convenience；The measurement of wind powder flow rate and coal dust density in pipeline is realized by the method for installing contactless electrostatic transducer, and the localization calculated by Implementation of Embedded System, local computing obtains result and is transmitted by Ethernet, network transmission content is only result data, substantially reduces network bandwidth occupancy.
Description
Technical field
The present invention relates to boiler combustion control technology fields, and in particular to a kind of online detection of primary air system and measurement side
Method.
Background technique
In the firing optimization of coal fired power plant pulverized-coal fired boiler, the reasonable distribution of coal dust amount and combustion air is boiler safety warp
One primary condition of Ji operation.Wherein, reasonable distribution includes two layers of meaning: first is that the total coal-air ratio being sent into furnace is maintained,
Maintain burner hearth excess air coefficient within the limits prescribed；Second is that each burner send all in accordance with certain coal-air ratio to burner hearth
Enter fuel, i.e. coal-air ratio answers mean allocation, only in this way, just the combustion efficiency of entire burner hearth can be made best.If each burner
Fuel and air are sent into the ratio of great disparity, although burner hearth excess air coefficient is still maintained in the range of regulation, for list
For a burner, the uneven distribution of air capacity and coal dust will make each burner some seriously scarce wind, fill coal dust firing not
Point, unburned carbon in flue dust increases, and reduces boiler efficiency, or even since combustion instability causes boiler vibration or fire extinguishing；And have tight
Powder is lacked again, keeps boiler combustion local air superfluous, and nitrogen oxides, which increases, increases denitration cost；And boiler burns partially and brings local mistake
A series of adverse consequences such as heat erosion.
Modern large-sized boiler mostly uses unit pulverized-coal system, and usually every coal pulverizer need to be fired to four, a certain layer of boiler
Sometimes even eight burners provide primary wind and powder to burner, but each burner has wind powder amount unevenness, air distribution not in various degree
Reasonable problem.Each coal pipe of the same coal pulverizer outlet of coal-burning boiler moves towards, stroke and length are all different, deposits between coal pipe
In resistance error, keep primary air velocity and air quantity uneven, at present this deviation be can be adjustable on tube cell by adjusting being mounted on
Shrinkage cavity leveling.But the leveling of each wind speed and air quantity it is not intended that coal dust amount leveling, the pulverized coal mass flow in each primary air piping is simultaneously
Not necessarily uniformly, this be as separator for coal mill internal structure and wind powder aerodynamic field it is uneven caused by.Therefore, accurate, stable
Control boiler primary air piping wind speed and coal powder density for burner steady operation, guarantee high efficiency boiler burning so that
Energy saving, reduction discharge aspect is all of great significance.
In order to stabilization, it is accurately realized the control of boiler primary air piping powder sending quantity, then must be accomplished first accurately
The real time data for acquiring primary air piping powder sending quantity using the control to boiler milling system, and then realizes complete closed loop control
System.
This system is then coal powder density and stream in acquisition boiler primary air piping quasi real time by electrostatic transducer mode
Speed provides real-time monitoring information to accurately control primary air flow and coal dust amount.
The flowing of the wind powder mixture of power boiler breeze belongs to dilute gas-solid two-phase flow and moves, and the measurement of coal powder density belongs to
The scope of two-phase flow concentration.Scholar both domestic and external has done a large amount of research work to this, proposes many measurement methods, wishes
Prestige can obtain optimal measurement effect.These methods can substantially be divided into non-contact measurement and two kinds of contact type measurement.
1, non-contact measurement includes:
A) capacitance method；
B) optical method；
C) process tomographic imaging method etc.；
2, contact type measurement includes:
A) heat transfer method；
B) friction electrical method；
C) energy method；
These non-contact measurements are primarily present following some problems: measurement accuracy is high, vulnerable to interference, system Construction mistake
In the complexity the defects of.
Summary of the invention
1, in view of the deficiencies of the prior art, the present invention proposes one kind is sensed by installation without abrasion contactless loop electrostatic
The method of device realizes the measurement of wind powder flow rate and pulverized-coal concentration in pipeline；Other plug-in type measuring principles are overcome because of abrasion
And can not long-term on-line operation the drawbacks of；
2, the localization that the present invention is calculated by Implementation of Embedded System, local computing obtain result and are passed by Ethernet
Defeated, network transmission content is only result data, substantially reduces network bandwidth occupancy；Such as gigawatt unit boiler has 48
The sensor live signal of root wind powder pipe road and 96 or more need while handling transmission.Thus the wind and powder on-line prison of principle composition
It surveys and control system has the function of real-time and more powerful.
3, since coal dust is worn and is blocked, usual means can not measure primary air velocity, and the present invention is by calculating phase
Associated charge signal time on adjacent two electrostatic transducers is poor, then the distance according to two electrostatic transducers calculates outlet air powder
Flow velocity；This principle provides feasibility and more accurate believable measurement side to the measurement of wind powder mixture Gas-solid Two-phase Flow
Method.
4, due to being influenced by factors such as coal quality phosphorus content in electrostatic measurement principle, can not precise measurement coal pipe coal dust it is close
Degree.This system, to overcome this drawback, can accurately calculate each coal pulverizer and go out due to networking with the DCS/SIS in power station
Each coal pipe coal dust density of mouth and deviation.
5, this system can carry out coal quality phosphorus content by the static content data that coal pulverizer coal-supplying amount and coal dust generate big
Data analysis, and then boiler is instructed to be modified the Secondary Air air distribution of burner.
Specific technical solution is as follows:
A kind of online detection of primary air system is provided at least two electrostatic transducer units, each electrostatic transducer unit
Output end connect with the input terminal of advance signal processing unit, the output end of the advance signal processing unit is connected through interchanger
Ethernet is formed, the DCS/SIS system of at least a host computer and power plant is also connected on the Ethernet.
As optimization:
The electrostatic transducer unit is provided with circular insulation air hose, in the inner wall of the insulation air hose and main wind powder pipe road
Wall flushes；Circumferential direction offers at least two mounting grooves in the insulation pipe outer wall, is respectively arranged with electrostatic in the mounting groove
Sensor electrode.
Flanged joint is used between the insulation air hose and main wind powder pipe road, convenient disassembly is easily installed and overhauls.
The interelectrode distance of axially adjacent electrostatic transducer is 5-10cm on the air hose.
It is equipped with shielded layer on the outer edge of the flange, the interference of external signal is effectively prevent, guarantees sensor
It works normally.
Advance signal processing unit mounting bracket is provided with above the outer edge of the flange, advance signal processing is single
Thermal insulation layer is provided between first mounting bracket and the main wind powder pipe road.Advance signal processing unit mounting bracket and thermal insulation layer
Setting, the heat in main wind powder pipe road can be isolated with advance signal processing unit, guarantee the normal of advance signal processing unit
Work.
The advance signal processing unit is provided with master controller, and the input terminal of the master controller is connected at least two points
Controller, the input terminal of each sub-controller are connected with respective signal acquisition module, and the input terminal of each signal acquisition module connects
It is connected to respective electrostatic transducer electrode.
A kind of measurement method of online detection of primary air system, it is characterised in that specific step is as follows for use:
Step 1: using the charge signal for flowing coal dust in electrostatic transducer acquisition wind powder pipe road；
Step 2: it is poor by calculating the associated charge signal time on adjacent two electrostatic transducers, then according to two
The distance of electrostatic transducer calculates the flow velocity of outlet air powder；
Step 3: it by the power of calculated charge signal, calculates coal pulverizer and exports each coal pipe coal dust density signal；
Step 4: by with Power Plant DCS/SIS systems connection, obtain each coal pulverizer coal-supplying amount data, inverse goes out each tube cell
Practical coal dust density calculates each coal pipe coal dust density variation value according to the practical coal dust density value of each tube cell；
Step 5: the coal dust density variation value of period same in each air hose is compared, whether judgment bias surpasses
Setting value out provides regulating command to the adjusting of each wind powder pipe coal dust density.
Step 6: the wind powder speed and wind speed deviation of each coal pipe of each coal pulverizer, judgment bias are calculated by step 2
Whether exceed setting value, regulating command is provided to the adjusting of each wind powder pipe wind speed.
As optimization, the step 2 specifically:
The charge signal that sensor is monitored is transformed to voltage signal；
By the analog/digital conversion device of sampling simultaneously, it is that t is sampled with the sampling period, becomes digital signal, every road is adopted
Collect data N point, obtains two paths of data x1、x2, according to function formula:
Acquisition function valid data length is 2*N-1 point,
Wherein N is the midpoint of effective length voltage signal, and M is peak value；
The time difference of two paths of signals is are as follows: T=| M-N*t；
According to sensor mounting distance m, and the time difference T obtained is calculated, calculates the wind powder flow rate for obtaining and flowing through pipeline.
It is easily worn the invention has the benefit that the present invention solves original wind powder measuring system sensor, it can not be complete
The drawbacks of growth time is monitored on-line, meanwhile, electrostatic transducer can be located at pipeline outer wall, overhaul, replace and provide convenience
Approach；The measurement of wind powder flow rate and coal dust density in pipeline is realized by the method for installing contactless electrostatic transducer, and
The localization calculated by Implementation of Embedded System, local computing obtain result and are transmitted by Ethernet, and network transmission content is only
For result data, substantially reduce network bandwidth occupancy；And by with Power Plant DCS/SIS systems connection, each coal pulverizer can be obtained
Coal-supplying amount data, by the charge signal of coal dust in survey calculation air hose, inverse goes out the practical coal dust density of each tube cell, to overcome
The influence of the factors such as coal quality phosphorus content calculates each coal pulverizer and exports each coal pipe coal dust density variation value；And pass through phase
The time difference of adjacent two received coherent signals of sensor calculates each coal pulverizer and exports each coal dust manage-style powder flow rate, meets steady
Fixed is accurately communicated to information control system to realize the leveling control of boiler wind powder system, is that the Secondary Air of boiler is accurate
Air distribution is laid a solid foundation.
Detailed description of the invention
Fig. 1 is on-line measurement system structure chart of the present invention
The schematic diagram of signal acquisition module in Fig. 2.
Specific embodiment
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawing, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, so as to make a clearer definition of the protection scope of the present invention.
As shown in Figure 1, a kind of online detection of primary air system, is arranged an electrostatic transducer unit in every main wind powder pipe
1, each electrostatic transducer unit 1 has been correspondingly connected with an advance signal processing unit 2, by multiple 1 Hes of electrostatic transducer unit
Advance signal processing unit 2 connects composition Ethernet through interchanger, also sets up an at least host computer 3, this machine 3, exchange
The DCS/SIS system of machine and power plant is in communication with each other, and forms entire online detection of primary air system.
Electrostatic transducer unit 1 is provided with the insulation tube air hose of annulus, in the inner wall of the insulation air hose and main wind powder pipe road
Wall flushes；And there are two Annular electrostatic sensor electrodes for axially distributed setting on the outer wall of the insulation air hose, described exhausted
Mounting groove is offered in edge pipe outer wall, the electrostatic transducer electrode is mounted in the mounting groove.Two adjacent annulars are quiet
The interelectrode distance of electric transducer is 5-10cm.Flange is used between the insulation air hose of electrostatic transducer unit and main wind powder pipe road
Connection, insulation air hose can maintenance or replacement easy to disassemble.Prolong circumference in flange and be provided with perfect electrostatic frequency and closes system, the electrostatic
It is gauze screen or shielding case that frequency, which closes system, flange is wrapped up, to prevent the interference of external signal.
Electrostatic transducer unit is provided with installation advance signal processing unit mounting rack on the flange, to guarantee pipeline
Heat cannot conduct to the advance signal processing unit being made of electronic component.
Advance signal processing unit is provided with master controller, and the input terminal of the master controller is connected there are two sub-controller,
The input terminal of each sub-controller is connected with respective signal acquisition module, and the input terminal of each signal acquisition module is connected with respectively
Electrostatic transducer electrode.
As shown in Figure 2: the signal acquisition module is provided with first stage amplifier U1A, and the reverse phase of first stage amplifier U1A is defeated
Entering end is signal input part, and non-inverting input terminal is grounded through resistance R2, capacitor C2 is parallel at the both ends of resistance R2, described one
Grade amplifier U1A output end and inverting input terminal span are connected to resistance R1, and at the both ends of resistance R1, bridging has capacitor C1；It is described
First stage amplifier U1A output end is also connect with the non-inverting input terminal of two-stage amplifier U2, the anti-phase input of two-stage amplifier U2
End ground connection, output end are module information output end.
A kind of measurement method of online detection of primary air system, specific step is as follows for use:
Step 1: using the charge signal for flowing coal dust in electrostatic transducer acquisition wind powder pipe road；
Step 2: it is poor by calculating the associated charge signal time on adjacent two electrostatic transducers, then according to two
The distance of electrostatic transducer calculates the flow velocity of outlet air powder；The charge signal that sensor is monitored is transformed to voltage signal；
By the analog/digital conversion device of sampling simultaneously, it is that t is sampled with the sampling period, becomes digital signal, every road is adopted
Collect data N point, obtains two paths of data x1、x2, according to function formula:
Acquisition function valid data length is 2*N-1 point,
Wherein N is the midpoint of effective length voltage signal, and M is peak value；
The time difference of two paths of signals is are as follows: T=| M-N | * t；
According to sensor mounting distance m, and the time difference T obtained is calculated, calculates the wind powder flow rate for obtaining and flowing through pipeline.
Step 3: it by the power of calculated charge signal, calculates coal pulverizer and exports each coal pipe coal dust density signal；
Step 4: by with Power Plant DCS/SIS systems connection, obtain each coal pulverizer coal-supplying amount data, inverse goes out each tube cell
Practical coal dust density calculates each coal pipe coal dust density variation value according to the practical coal dust density value of each tube cell；
Step 5: the coal dust density variation value of period same in each air hose is compared, whether judgment bias surpasses
Setting value out provides regulating command to the adjusting of each wind powder pipe coal dust density.
Step 6: the wind powder speed and wind speed deviation of each coal pipe of each coal pulverizer, judgment bias are calculated by step 2
Whether exceed setting value, regulating command is provided to the adjusting of each wind powder pipe wind speed.
Measuring principle explanation: coal dust flows through pipeline or conveyer belt as fine particle, can be touched due to the friction between particle
It hits or the frictional impact between particle and duct wall, generates minimum charge, coal powder density and sensor output signal in air hose
Intensity is directly proportional, and the more high then signal amplitude of concentration is bigger.Therefore we select the power spectral density for calculating signal dense as coal dust
The data of degree.For two adjacent locations of same pipeline upstream and downstream point
Not Cai Ji charge signal, then can find, the structure and form occurred in short distance flow process due to multiparticle
Variation less, then obtains two charge signals with correlation, the collection point nearlyr correlation of distance is stronger, measures according to two
The characteristic of point uses the calculation method of correlation function, and available particle flows through the time difference between two measurement points, according at this time
Between difference and two measurement points between distance then can get particle flowing velocity.
But it should be recognized that shown according to dependence test, the intensity of signal be not it is uniquely related to coal dust density, together
When it is related to the factors such as the carbon content of coal dust.That is under identical coal dust density, coal dust institute phosphorus content is higher, then monitors
Signal strength is higher, thus within the system for the display of coal dust density actually indicate should be in pipeline " carbon is close
Degree ".If wanting " carbon density " corresponding to coal dust density, it is dense coal dust must could to be obtained by the carbon containing coefficient of discharge divided by coal dust
Degree.This be in electrostatic measurement principle can not precise measurement coal dust density the drawbacks of.This system of the invention is due to the DCS/ with power station
SIS networking, to overcome this drawback, by with Power Plant DCS/SIS systems connection, obtain each coal pulverizer coal-supplying amount data, instead
Calculate the practical coal dust density of each tube cell；Each coal pulverizer can be accurately calculated and export each coal pipe coal dust density variation value.
Claims (9)
1. a kind of online detection of primary air system, it is characterised in that: be provided at least two electrostatic transducer units (1), Mei Gejing
The output end of electrical sensor units (1) is connect with the input terminal of advance signal processing unit (2), the advance signal processing unit
(2) output end connects composition Ethernet through interchanger, is also connected at least a host computer (3) and electricity on the Ethernet
The DCS/SIS system of factory.
2. online detection of primary air system according to claim 1, it is characterised in that: electrostatic transducer unit (1) setting
There is circular insulation air hose, the inner wall of the insulation air hose is flushed with main wind powder pipe road inner wall；
Circumferential direction offers at least two mounting grooves in the insulation pipe outer wall, and electrostatic sensing is respectively arranged in the mounting groove
Device electrode.
3. online detection of primary air system according to claim 2, it is characterised in that: the insulation air hose and main wind powder pipe road it
Between use flanged joint.
4. online detection of primary air system according to claim 2, it is characterised in that: axially adjacent quiet on the air hose
The interelectrode distance of electric transducer is 5-10cm.
5. online detection of primary air system according to claim 3, it is characterised in that: be equipped on the outer edge of the flange
Shielded layer.
6. online detection of primary air system according to claim 3, it is characterised in that: be arranged above the outer edge of the flange
There is advance signal processing unit mounting bracket, is arranged between the advance signal processing unit mounting bracket and the main wind powder pipe road
There is thermal insulation layer.
7. online detection of primary air system according to claim 1, it is characterised in that: the advance signal processing unit (2) sets
It is equipped with master controller, the input terminal of the master controller is connected at least two sub-controllers, and the input terminal of each sub-controller connects
It is connected to respective signal acquisition module, the input terminal of each signal acquisition module is connected with respective electrostatic transducer electrode.
8. a kind of measurement method of online detection of primary air system, it is characterised in that specific step is as follows for use:
Step 1: using the charge signal for flowing coal dust in electrostatic transducer acquisition wind powder pipe road；
Step 2: it is poor by calculating the associated charge signal time on adjacent two electrostatic transducers, then according to two electrostatic
The distance of sensor calculates the flow velocity of outlet air powder；
Step 3: it by the power of calculated charge signal, calculates coal pulverizer and exports each coal pipe coal dust density signal；
Step 4: by with Power Plant DCS/SIS systems connection, obtain each coal pulverizer coal-supplying amount data, it is practical that inverse goes out each tube cell
Coal dust density calculates each coal pipe coal dust density variation value according to the practical coal dust density value of each tube cell；
Step 5: the coal dust density variation value of period same in each air hose is compared, whether judgment bias, which exceeds, sets
Definite value provides regulating command to the adjusting of each wind powder pipe coal dust density.
Step 6: the wind powder speed and wind speed deviation of each coal pipe of each coal pulverizer are calculated by step 2, whether is judgment bias
Beyond setting value, regulating command is provided to the adjusting of each wind powder pipe wind speed.
9. the measurement method of online detection of primary air system according to claim 8, it is characterised in that: the step 2 is specific
Are as follows:
The charge signal that sensor is monitored is transformed to voltage signal；
By the analog/digital conversion device of sampling simultaneously, it is that t is sampled with the sampling period, becomes digital signal, every road acquires number
According to N point, two paths of data x is obtained1、x2, according to function formula:
Acquisition function valid data length is 2*N-1 point,
Wherein N is the midpoint of effective length voltage signal, and M is peak value；
The time difference of two paths of signals is are as follows: T=| M-N | * t；
According to sensor mounting distance m, and the time difference T obtained is calculated, calculates the wind powder flow rate for obtaining and flowing through pipeline.
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| CN111895388A (en) * | 2020-07-07 | 2020-11-06 | 江苏博森能源技术股份有限公司 | Method for measuring carbon content of pulverized coal by using electrostatic and capacitive superposition induction of W-flame boiler |
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Application publication date: 20190125 |