CN106443055A - Coil-type wind powder online measuring system and method - Google Patents
Coil-type wind powder online measuring system and method Download PDFInfo
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- CN106443055A CN106443055A CN201610793230.7A CN201610793230A CN106443055A CN 106443055 A CN106443055 A CN 106443055A CN 201610793230 A CN201610793230 A CN 201610793230A CN 106443055 A CN106443055 A CN 106443055A
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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
- G01P5/08—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring variation of an electric variable directly affected by the flow, e.g. by using dynamo-electric effect
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- 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
- G01N15/02—Investigating particle size or size distribution
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- 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
Abstract
The invention discloses a coil-type wind powder online measuring system and method. The system comprises a coil-type sensor, a signal preprocessing unit and a signal processing cabinet; the coil-type sensor measures charged particles in a pneumatic conveying pipeline by using alternating-current charge coupling principle and transmits the measured signals to the signal preprocessing unit for preprocessing the signal, then the signal processing cabinet analyzes, calculates and processes the measured data to obtain flow rate, concentration and thickness signals of powder, and the signals are transmitted to a DCS (Distributed Control System) in a hard wiring manner or a communication manner, monitored, optimized and controlled. The system is simple in structure, convenient to install and excellent in sealing performance, can measure the flow rate, concentration and thickness of powder in a primary air pipe in real time and on line with high precision and reliability when a boiler and a powder making system run, and provides an important control basis for combustion optimization adjustment of a boiler system, thereby fulfilling the purposes of optimizing combustion and reducing pollutant emission.
Description
Technical field
The present invention relates to industrial Geldart-D particle powder technical field of measurement and test, particularly to a kind of measurement of coil-type wind and powder on-line
System and method.
Background technology
Because extensive production and management are so that coal electricity causes very big pressure in process of production to environmental protection, it is harmful to
Gas and dust make environmental pollution be further exacerbated by.National correlation department has put into effect a series of policies and regulation it is desirable to pass through
Optimize each production link, reducing energy consumption, pollutant discharge amount is preferably minimized.
For coal unit, equilibrium between the flow velocity in primary air piping, flow, fineness and each tube cell for the coal dust divides
Pairing Mei electricity enterprise production safety and energy-saving and emission-reduction have extremely important key effect.The flow velocity of coal dust is suitable, on the one hand
Coal dust transfer efficiency can be improved, on the other hand can avoid that speed is too high to lead to pipe wear and unnecessary energy resource consumption, or
When speed is too low, part of coal powder particles cause plugging and then lead to serious pipe explosion accident in pipeline deposition.Coal dust dense
The equilibrium of degree is very key for boiler combustion, and the unbalanced burning of coal dust in each tube cell makes burner hearth flame deflection, causes
Boiler water wall localized hyperthermia, and then lead to water wall high temperature corrosion.Fineness of pulverized coal also has critically important meaning to boiler combustion
Justice, coal dust is meticulous, and boiler combustion fully, causes unnecessary energy resource consumption to pulverized coal preparation system；Coal dust is excessively thick, leads to burning not filled
Point, unburned carbon in flue dust raises, and causes boiler efficiency to reduce.
There is certain defect in existing measurement apparatus and technology, be mainly manifested in the following aspects to varying degrees：
1st, complex structure, the extra subsidiary conditions (as compressed air purging etc.) of needs, installation difficulty is big；
2nd, harshness is required to use environment, be not suitable with reliability service in power plant's actual environment；
3rd, wearability, sealing is poor, lead to life of product relatively low；
4th, active measurement is carried out to pipeline powder, cause potential safety hazard；
5th, sonde-type plug-in type measurement, representativeness is poor, probe is easy to wear, and powder flow field is interfered, and then affects
Certainty of measurement；
6th, measuring system signal transmission is easily disturbed, and leads to distorted signals；
7th, signal measurement and processing function are not perfect, such as pertain only to the measurement of powder flow rate or concentration, without powder
The measurement of fineness；
8th, certainty of measurement and confidence level not high it is impossible to optimize and revise and control offer reliable foundation.
Content of the invention
It is an object of the invention to provide a kind of simple and reasonable, easy for installation, can be to coal dust in primary air piping
Flow velocity, concentration and fineness carry out safety, accurate, the annular wind and powder on-line measuring system of reliable measurements and method.
For reaching above-mentioned purpose, the annular wind and powder on-line measuring system of the present invention
Including the coil-type measurement sensor being sequentially connected, front end signal processing unit, signal transacting rack, coil-type is surveyed
Quantity sensor is installed on wind powder pipe road, and charged particle in Pneumatic conveying pipeline is measured, and the signal recording is through front end signal
Processing unit is sent to signal transacting rack and is analyzed and calculates after carrying out early stage process, signal transacting rack will be analyzed and count
Wind powder flow rate after calculation, powder concentration and fineness signal be communicatively sent to DCS system for monitoring and burning optimization adjust.
Described coil-type measurement sensor includes flanged (FLGD) outer shroud and is fixed on outer shroud by flanged (FLGD) end cap
Interior inner ring, is embedded with two groups of annular electrodes in the gap between inner and outer rings and end cap, and is provided with outer shroud and annular
The front end signal processing unit that electrode is connected.
The axial spacing of two groups of described annular electrodes is 20-60mm.
Described annular electrode radial thickness is 1-5mm, and axial width is 1-5mm.
Described front end signal processing unit includes conversion, amplification, filtering and the AD conversion module being sequentially connected.
Described signal transacting rack by signal processing unit, operational analysis unit, display unit and is used for being connected with DCS
Interface unit composition, signal processing unit be by measurement signal pass through continuous excluding gross error method carry out screening examination, weed out
Disabled error signal and interference signal, operational analysis unit is divided into flow velocity, concentration and fineness computing module；
Described flow relocity calculation module carries out flow velocity by the way of cross correlation algorithm is combined with dynamic self-calibration algorithm
Calculate；
By carrying out specificity analysis to measured signal amplitude, weighted average calculation goes out surveyed powder to described concentration calculation module
The powder concentration of pipe；
By carrying out specificity analysis to the frequency of measured signal, weighted average calculation goes out to be surveyed described fineness computing module
The particle distribution of tube cell.
A kind of coil-type wind and powder on-line measuring method, comprises the steps：
Step 1：Coil-type measurement sensor utilizes AC charge principle of induction, and measurement charged particle flows institute in pipeline
The induced signal producing；
Step 2：Front end signal processing unit carries out early stage conversion, amplification, filtering and AD conversion and processes to induced signal, and
Signal transacting rack is sent in communication bus mode；
Step 3：The signal that the signal processing unit of signal transacting rack comes to the transmission of front end signal processing unit passes through even
Continuous excluding gross error method carries out screening and screens, and weeds out disabled error signal and interference signal；
Step 4：The signal coming from signal processing unit, through the flow velocity in operational analysis unit, concentration, fineness computing module
After analytical calculation, draw the flow velocity of powder granule in pipeline, concentration and fineness value；
Step 5：The signal that display unit exports to operational analysis unit is shown on the spot, conveniently patrols and examines and safeguards；
Step 6：The signal that operational analysis unit exports communicatively is sent to DCS system by interface unit, for managing
In road, the flow velocity of powder granule, concentration, fineness are monitored and are adjusted control.
Described flow relocity calculation module carries out flow velocity by the way of cross correlation algorithm is combined with dynamic self-calibration algorithm
Calculate；
By carrying out specificity analysis to measured signal amplitude, weighted average calculation goes out surveyed powder to described concentration calculation module
The powder concentration of pipe；
By carrying out specificity analysis to the frequency of measured signal, weighted average calculation goes out to be surveyed described fineness computing module
The particle distribution of tube cell.
Coil-type wind and powder on-line measuring system involved in the present invention, has considered site environment, measuring system function,
Performance, applicability, service life, the convenience many factors that system is installed and safeguarded, disclosure satisfy that the application of industrial environment
Require, realize accurate, the safe and reliable, on-line measurement to coal dust flow velocity, concentration, fineness in coal unit primary air piping.Run
Personnel can allocate each wind according to measurement result and the proportioning of coal dust is to ensure the stable and optimum of coal dust firing and finally real
Now higher efficiency of combustion and the purpose reducing pollutant emission.
Measurement sensor utilizes AC charge principle of induction, and the produced sensing of flow in pipeline of measurement charged particle is believed
Number；Signal Pretreatment unit carries out early stage conversion, amplification, filtering and AD conversion and processes to induced signal, and with communication bus side
Formula sends signal transacting rack to；The signal that signal processing unit comes to the transmission of Signal Pretreatment unit passes through continuous excluding gross error
Method carries out screening and screens, and weeds out disabled error signal and interference signal；The signal coming from signal processing unit, divides through computing
After analysis element analysis is processed, draw the flow velocity of powder granule in pipeline, concentration and fineness value；Display unit is to operational analysis unit
The signal of output is shown on the spot, conveniently patrols and examines and safeguards；The signal that operational analysis unit is exported by interface unit is to communicate
Mode is sent to DCS system, is monitored for the flow velocity of powder granule in pipeline, concentration, fineness and is adjusted control.
The present invention has the advantages that：
The system of the present invention can in real time, the flow velocity of powder, concentration and fineness in on-line measurement wind powder pipe road, function is complete
Whole；
Measurement sensor both sides involved in the present invention carry adpting flange, make that installation is more convenient, sealing property is more preferable；
Measurement sensor involved in the present invention adopts stainless steel material, total cross-section, passive measurement technology, wearability, representative
Property, security are more preferable；
Measurement sensor involved in the present invention adopts communication bus mode transmission signal, and signal transmission is convenient, anti-interference energy
Power is strong；
Signal transacting rack involved in the present invention, using the functional module meeting actual demand, reaches to measurement signal
Effectively analyze and process, perfect in shape and function, accurately reliability；
Method involved in the present invention can be suitable for industrial environment, in the situation that powder flow field is had no effect
Under, realize to powder flow rate, concentration, fineness real-time, online, accurate measurement；
Brief description
Fig. 1 is measurement sensor structural representation.
Fig. 2 is the system structure diagram of the present invention.
Fig. 3 is signal transacting rack functional unit structural representation.
Specific embodiment
Referring to Fig. 1, the measuring system of the present invention includes coil-type measurement sensor, the front end signal process list being sequentially connected
Unit, signal transacting rack, coil-type measurement sensor is installed on wind powder pipe road, charged particle in Pneumatic conveying pipeline is surveyed
Amount, the signal recording carries out through front end signal processing unit being sent to signal transacting rack after early stage process and is analyzed and counts
Calculate, the wind powder flow rate after analysis and calculating, powder concentration and fineness signal are communicatively sent to DCS system by signal transacting rack
Unite for monitoring and burning optimization adjustment.
Signal transacting rack is by signal processing unit, operational analysis unit, display unit and the interface for being connected with DCS
Unit forms, and signal processing unit is by continuous excluding gross error method, measurement signal to be carried out screening screen, and weeds out unavailable
Error signal and interference signal, operational analysis unit is divided into flow velocity, concentration and fineness computing module；
Described flow relocity calculation module carries out flow velocity by the way of cross correlation algorithm is combined with dynamic self-calibration algorithm
Calculate；
By carrying out specificity analysis to measured signal amplitude, weighted average calculation goes out surveyed powder to described concentration calculation module
The powder concentration of pipe；
By carrying out specificity analysis to the frequency of measured signal, weighted average calculation goes out to be surveyed described fineness computing module
The particle distribution of tube cell.
Referring to Fig. 2, measurement sensor of the present invention adopts coil-type structure, material selection abrasion-proof stainless steel.Including flanged
Outer shroud 1 and be fixed on inner ring 3 in outer shroud 1 by flanged (FLGD) end cap 5, in the gap between inner and outer rings and end cap
It is embedded with two groups of annular electrodes 2, and the front end signal processing unit 4 being connected with annular electrode 2 is provided with outer shroud 1.Two groups
The axial spacing of annular electrode 2 is 20-60mm.Annular electrode 2 radial thickness is 1-5mm, and axial width is 1-5mm.Front end is believed
Number processing unit 4 includes conversion, amplification, filtering and the AD conversion module being sequentially connected, and provides communication bus interface, meets and surveys
Amount signal is to the transmission demand of signal transacting rack.
Referring to Fig. 3, signal transacting rack by signal processing unit, operational analysis unit, display unit and is used for and DCS phase
Interface unit composition even, signal processing unit is by continuous excluding gross error method, measurement signal to be carried out screening screen, and rejects
Fall disabled error signal and interference signal, operational analysis unit is divided into flow velocity, concentration and fineness computing module；
Described flow relocity calculation module carries out flow velocity by the way of cross correlation algorithm is combined with dynamic self-calibration algorithm
Calculate；
By carrying out specificity analysis to measured signal amplitude, weighted average calculation goes out surveyed powder to described concentration calculation module
The powder concentration of pipe；
By carrying out specificity analysis to the frequency of measured signal, weighted average calculation goes out to be surveyed described fineness computing module
The particle distribution of tube cell.
The signal of operational analysis unit output can be shown by display unit on the spot, conveniently patrol and examine on the spot and safeguard.
The signal of operational analysis unit output can be communicatively sent to DCS system by interface unit.
The measuring method of the present invention is as follows：
Step 1：Coil-type measurement sensor utilizes AC charge principle of induction, and measurement charged particle flows institute in pipeline
The induced signal producing；
Step 2：Front end signal processing unit 4 carries out early stage conversion, amplification, filtering and AD conversion and processes to induced signal,
And signal transacting rack is sent in communication bus mode；
Step 3：The signal that the signal processing unit of signal transacting rack comes to the transmission of front end signal processing unit passes through even
Continuous excluding gross error method carries out screening and screens, and weeds out disabled error signal and interference signal；
Step 4：The signal coming from signal processing unit, through the flow velocity in operational analysis unit, concentration, fineness computing module
After analytical calculation, draw the flow velocity of powder granule in pipeline, concentration and fineness value；
Described flow relocity calculation module carries out flow velocity by the way of cross correlation algorithm is combined with dynamic self-calibration algorithm
Calculate；
By carrying out specificity analysis to measured signal amplitude, weighted average calculation goes out surveyed powder to described concentration calculation module
The powder concentration of pipe；
By carrying out specificity analysis to the frequency of measured signal, weighted average calculation goes out to be surveyed described fineness computing module
The particle distribution of tube cell.
Step 5：The signal that display unit exports to operational analysis unit is shown on the spot, conveniently patrols and examines and safeguards；
Step 6：The signal that operational analysis unit exports communicatively is sent to DCS system by interface unit, for managing
In road, the flow velocity of powder granule, concentration, fineness are monitored and are adjusted control.
Claims (8)
1. a kind of coil-type wind and powder on-line measuring system it is characterised in that：Including the coil-type measurement sensor being sequentially connected, front
End signal processing unit, signal transacting rack, coil-type measurement sensor is installed on wind powder pipe road, carries in Pneumatic conveying pipeline
Electric particle measures, and the signal recording carries out through front end signal processing unit being sent to signal transacting rack after early stage process and
Row analysis and calculating, signal transacting rack is by the wind powder flow rate after analysis and calculating, powder concentration and fineness signal communicatively
Be sent to DCS system for monitoring and burning optimization adjust.
2. the coil-type wind and powder on-line measuring system according to claim 1 it is characterised in that：Described coil-type measurement
Sensor is included flanged (FLGD) outer shroud (1) and is fixed on inner ring (3) in outer shroud (1) by flanged (FLGD) end cap (5),
It is embedded with two groups of annular electrodes (2) in gap between inner and outer rings and end cap, and be provided with and annular electrode on outer shroud (1)
(2) the front end signal processing unit (4) being connected.
3. coil-type wind and powder on-line measuring system according to claim 2 it is characterised in that：Two groups of described annular electrodes
(2) axial spacing is 20-60mm.
4. coil-type wind and powder on-line measuring system according to claim 2 it is characterised in that：Described annular electrode (2)
Radial thickness is 1-5mm, and axial width is 1-5mm.
5. coil-type wind and powder on-line measuring system according to claim 1 and 2 it is characterised in that：Described front end signal
Conversion, amplification, filtering and AD conversion module that processing unit (4) inclusion is sequentially connected.
6. coil-type wind and powder on-line measuring system according to claim 1 it is characterised in that：Described signal transacting rack
It is made up of with the interface unit for being connected with DCS signal processing unit, operational analysis unit, display unit, signal transacting list
Unit is by continuous excluding gross error method, measurement signal to be carried out screening screen, and weeds out disabled error signal and interference signal,
Operational analysis unit is divided into flow velocity, concentration and fineness computing module；
Described flow relocity calculation module carries out flow relocity calculation by the way of cross correlation algorithm is combined with dynamic self-calibration algorithm；
By carrying out specificity analysis to measured signal amplitude, weighted average calculation goes out surveyed tube cell to described concentration calculation module
Powder concentration；
By carrying out specificity analysis to the frequency of measured signal, weighted average calculation goes out surveyed tube cell to described fineness computing module
Particle distribution.
7. a kind of On-line Measuring Method as any one coil-type wind and powder on-line measuring system in claim 1-6, its feature
It is to comprise the steps：
Step 1：Coil-type measurement sensor utilizes AC charge principle of induction, and measurement charged particle flows in pipeline and produced
Induced signal；
Step 2：Front end signal processing unit (4) carries out early stage conversion, amplification, filtering and AD conversion and processes to induced signal, and
Signal transacting rack is sent in communication bus mode；
Step 3：The signal that the signal processing unit of signal transacting rack comes to the transmission of front end signal processing unit passes through continuously to pick
Screen except rough error method carries out screening, weed out disabled error signal and interference signal；
Step 4：The signal coming from signal processing unit, calculates module analysis through the flow velocity in operational analysis unit, concentration, fineness
After calculating, draw the flow velocity of powder granule in pipeline, concentration and fineness value；
Step 5：The signal that display unit exports to operational analysis unit is shown on the spot, conveniently patrols and examines and safeguards；
Step 6：The signal that operational analysis unit exports communicatively is sent to DCS system by interface unit, in pipeline
The flow velocity of powder granule, concentration, fineness are monitored and are adjusted control.
8. coil-type wind and powder on-line measuring system according to claim 7 On-line Measuring Method it is characterised in that：Described
Flow relocity calculation module carry out flow relocity calculation by the way of cross correlation algorithm is combined with dynamic self-calibration algorithm；
By carrying out specificity analysis to measured signal amplitude, weighted average calculation goes out surveyed tube cell to described concentration calculation module
Powder concentration；
By carrying out specificity analysis to the frequency of measured signal, weighted average calculation goes out surveyed tube cell to described fineness computing module
Particle distribution.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018204907A (en) * | 2017-06-08 | 2018-12-27 | 株式会社Ihi | Fine powder accumulation detection device |
| CN109270294A (en) * | 2018-11-22 | 2019-01-25 | 北京华科佳仪科技有限公司 | A kind of online detection of primary air system and measurement method |
| CN111457960A (en) * | 2020-04-22 | 2020-07-28 | 郑州阿尔伯特电力能源科技有限公司 | Wind-powder mixed flow multi-parameter real-time measuring method and measuring device thereof |
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| CN104655395A (en) * | 2015-01-16 | 2015-05-27 | 华北电力大学 | Device and method for detecting flow parameters of powder fluid in rectangular tube based on electrostatic induction |
| CN104614024A (en) * | 2015-02-28 | 2015-05-13 | 苏州华茂能源科技有限公司 | Method and device for representing electrostatic measurement of coal powder flows of milling and conveying system of power plant |
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| CN105067061A (en) * | 2015-08-20 | 2015-11-18 | 东南大学 | Powder mass flow rate measuring device and method based on electrostatic and capacitive sensor arrays |
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