CN106556026A - Air delivery pipe coal dust weight measurement instrument and multiple pipelines are balanced for powder control system - Google Patents
Air delivery pipe coal dust weight measurement instrument and multiple pipelines are balanced for powder control system Download PDFInfo
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Abstract
The invention discloses a kind of " air delivery pipe coal dust weight measurement instrument and multiple pipelines equilibrium powder-supply system ".Air delivery pipe coal dust weight measurement instrument, is using radiation sensor and pipe jointer measurement air delivery pipe coal dust weight；The coefficient k that coal dust weight is demarcated in the mathematical model of coal dust weight measurement instrument is exported using coal pulverizer；Delivered coal grain weight flowmeter using multiple wind, constitute coal dust balanced weight powder-supply system, using the meansigma methodss of multiple pipeline powder coal weight as coal dust weight set controlling value, setting control is carried out to each air delivery pipe coal dust weight, realizes that each wind send pipe equilibrium to supply powder.The equilibrium of air delivery pipe supplies powder, improves coal dust firing quality, efficiency in boiler, substantially reduces the skew and hot-spot, slagging scorification of flame of centre.This is significant to stability, safety and the economy for improving boiler operatiopn.
Description
Technical field
The present invention relates to wind send weight of material to measure, more particularly to multiple air delivery pipe coal dusts weight measurement and right
Multiple air supply ducts are balanced to adjust control for powder.
Background technology
Coal-burning boiler, electric boiler, big thermoelecrtic boiler, cement kiln etc., all with coal dust as fuel,
And coal dust is supplied to boiler with air delivery pipe.For example, large-scale power boiler is with multiple stage coal-grinding mechanism powder, multiple
Air delivery pipe layering supplies powder, each coal pulverizer to have multiple air delivery pipes to supply powder for one layer to boiler.Now with one layer,
One coal pulverizer is expressed as follows as a example by carrying four air delivery pipes：
Fig. 1 gives existing coal-grinding mechanism powder, for powder capital equipment schematic diagram：
Run coal bin (1), for storing fire coal；
Conveyer (2), for conveying fire coal；
Feeder (3), for giving coal pulverizer coal supply by weight；
Coal pulverizer (4), for by coal-fired broken, heating, drying, powder processed；
Blower fan (5), for coal dust is delivered to burner (9) by air delivery pipe；
Slightly, pulverized-coal collector (6), for isolating coarse powder, and return it into coal pulverizer and grind again；
The fine powder isolated is sent into into pulverized coal distributor (7)；
Pulverized coal distributor (7), for coal dust to be delivered to each air delivery pipe (8A, 8B, 8C, 8D) respectively；
Air delivery pipe (8), for pulverized coal conveying；
Burner (9), burns for coal dust is sprayed in boiler；
Boiler (10), produces steam-electric power with coal dust firing.
One large-scale power boiler, generally divides three layers-six layers, supplies powder with 20 or so air delivery pipes.By
In multiple pipelines, for the weight of powder, uneven (deviation is up to 20% sometimes, or even to 30%), has a strong impact on pot
In stove coal dust firing quality, efficiency and stove, flame of centre is unstable and offsets, or even causes hot-spot, draws
Play boiler water wall slagging scorification and affect boiler operatiopn stability, safety and economy.
For many years, those skilled in the art makes every effort to solve the problems, such as multiple air delivery pipes uniformly for powder, and what is had adopts
Adjustable pulverized coal distributor is used, the coal dust weight into each air delivery pipe is adjusted, to improve each pipeline powder coal weight
Amount deviation；What is had attempts research and development air delivery pipe coal dust gravity measure device, to the coal dust weight for measuring each air delivery pipe
Amount, solves uniformly for powder, but as air delivery pipe coal dust temperature is high, pressure is big, weight is few, speed is high,
Frictional force is big, and the characteristics of because uninterruptedly producing when power station is long, it is difficult to instrument k value is demarcated, therefore extremely
Modern air delivery pipe coal dust weight calculation is not yet solved with control is adjusted.
For the problems referred to above, the invention discloses a kind of " air delivery pipe coal dust weight measurement instrument and multiple pipelines
It is balanced to supply powder control system ", for measuring air delivery pipe coal dust weight and to multiple air delivery pipe coal dust weight
Regulation, control, to reduce the coal dust deviation of weight between each air delivery pipe, so as to be capable of achieving each pipeline
Equilibrium supplies powder, is finally reached stability, safety, economy and the consumption reduction reduction of discharging for improving boiler operatiopn.
The content of the invention
Present invention solves the technical problem that having：
1st, using radiant type LOAD CELLS and special pipe jointer, solve high to air delivery pipe coal dust
The little measurement problem of pressure, high temperature, high speed, high friction and weight；
2nd, using in interval of time, into coal pulverizer raw coal weight WI raw coalWith moisture MiValue, calculates
Go out coal pulverizer output coal dust weight WCoal-grinding powder, and in this, as standard value, under boiler working condition, complete
Demarcation to coefficient k in coal dust weight measurement mathematical model.
3rd, using automatic Calibration coefficient k, i.e. setting automatic Calibration time interval t1, per elapsed time t1,
Instrument calculates coal pulverizer output coal dust weight W automaticallyCoal-grinding powder, while in t1In time, coal dust measuring instrument
Mathematical model calculates coal dust weight WCoal dust,And with WCoal-grinding powderFor
Standard value, calculatesAnd kNewly=Δ k × k, with the K for calibrating every timeNewlyValue replacement is weighed number
Previous k value in model is learned, school zero null offset can not be caused when the long-term work so as to solve instrument
Etc. impact of the factor to accuracy.
4th, the present invention using multiple air delivery pipe coal dust weighed averages as coal dust weight set controlling value, it is right
Each pipeline powder coal weight carries out setting control, to solve the problems, such as that multiple pipelines are balanced for powder, so as to improve
The stability of boiler operatiopn, safety and economy.
" air delivery pipe coal dust weight measurement instrument " disclosed by the invention, installed in existing boiler milling system
Above air delivery pipe (see Fig. 2), its feature includes：
Radiant type LOAD CELLS (radiation source 101 and radiation detector 102), radiation source (101)
It is separately mounted to above and below air delivery pipe (8) both sides with radiation detector (102),
For measuring coal dust weight, weight signal U is giveni、U0；
Mounting bracket (103), for installing radiation source (101) and radiation detector (102)；
Pipe jointer (104), is placed in radionetric survey area, connects measurement zone with ring flange (105)
The air delivery pipe at interior two ends；
Wind speed measuring device (106) on air delivery pipe (8), for measuring in air delivery pipe
Wind speed (Vi)；
Device for measuring moisture (108), the conveyer belt (2) between run coal bin and coal pulverizer it is upper
Side, for measuring the moisture (M in raw coali)；
Weighing device (109), the lower section of conveyer belt (2) between run coal bin and coal pulverizer is used
In measurement raw coal weight WI raw coal；
Data acquisition process controller (107), for receiving the signal (U from radiation detectori、
U0), wind speed measuring device signal Vi, weighing device weight signal WI raw coal, device for measuring moisture
Moisture signal Mi。
Data acquisition process controller (107), according to weight signal Ui、U0, wind velocity signal Vi,
Coal dust weight W is calculated by mathematical model of weighingI coal dusts, the mathematical model is：
W in formulaI coal dusts- instantaneous weight；
WCoal dust- cumulative weight；
K- calibration coefficients；
U0Detector output signal during-coal dust free；
Ui- detector output signal when having coal dust；
Δ t- acquisition times；
M- times of collection.
Data acquisition process controller (107), according to moisture signal MiWith weight signal WI raw coal, it is real
When calculate into coal pulverizer raw coal weight WRaw coal, moisture weight WWater=WRaw coal×Mi, coal pulverizer system
Powder time t2Inside there is raw coal weight WCoal pulverizerWith output coal dust weight WCoal-grinding powder。
The technical program feature also has：
1st, in formula coefficient k demarcation：
With prior art, can only demarcate when stopping production, concrete scaling method is：Constant weight is weighed first
(WCoal dust) coal dust, the coal dust is sent into into air delivery pipe again then, Jing " survey by air delivery pipe coal dust weight
Amount instrument " measures weight WI coal dusts；Or in time of measuring, by " air delivery pipe coal dust weight measurement instrument "
Weight W is measured by formula (1) (now k=1)1 coal dust, at the same time, the coal powder collection is got up
Weigh to obtain WCoal dust, with weight W of weighingCoal dustAs standard value and " air delivery pipe coal dust weight measurement instrument "
Weight (the W for measuringI coal dusts) contrast, calibration coefficient k is drawn, is：Will
K value brings (1) formula into, that is, complete to demarcate.
The scaling method is not suitable for power plant, because air delivery pipe is continuous work, it is difficult to stop production to k
Demarcated, also cannot just be realized air delivery pipe coal dust weight measurement.
The present invention scaling method be：In time of measuring t1It is interior, according to into coal pulverizer raw coal weight
WRaw coal, raw coal contain moisture weight WWater, coal pulverizer is in t2Time memory has raw coal weight WCoal pulverizer, meter
Calculate coal pulverizer output coal dust weight WCoal-grinding powder(see Fig. 3).Fig. 4 (a) gives time of measuring and shows
It is intended to, t1- time of measuring (or nominal time), t2- coal-grinding mechanism powder time, t3- coal pulverizer
The output coal dust time；Fig. 4 (b) gives time of measuring t1At the end of, enter coal pulverizer moisture-free
Raw coal weight WCoal=WRaw coal(1-Mi), in t1T before end2In time, coal pulverizer has raw coal
(moisture-free) weight WCoal pulverizerWith in t1-t2Output coal dust weight W in timeCoal-grinding powder, thus can obtain：
WCoal-grinding powder=WRaw coal(1-Mi)-WCoal pulverizer……(3)；
Data acquisition process controller, according to acquisition time Δ t and time of measuring t1, t2, calculates(m is t1Time times of collection, n are t2Time times of collection)
Weight is W by air delivery pipeCoal-grinding powderCoal dust deliver to " air delivery pipe coal dust weight measurement instrument " be located survey
Amount area, measures coal dust weight W by formula (2) (now k=1)Coal dust, i.e.,：
By WCoal-grinding powderAs standard value and WCoal dustCompare, can try to achieveBy k value band
Enter (1), (2) formula, that is, realize the calibration coefficient k that do not stop production.
2nd, as air delivery pipe is continuously to supply powder, thus " air delivery pipe coal dust weight measurement instrument " can not school
Positive zero point, just causes null offset, affects certainty of measurement.
To solve zero creep, the present invention is provided with automatic Calibration coefficient k, that is, when setting automatic Calibration
Between t1, per Jing t1Time, instrument is automatically into demarcation k programs；According in t1In time, into coal-grinding
Machine raw coal weight WCoal=WRaw coal(1-Mi), in t2In time, coal pulverizer has coal weight WCoal pulverizer, calculate
Output coal dust weight WCoal-grinding powderValue, is tried to achieve using the value as standard value
kNewly=k × Δ k, uses kNewlyThe k value in pre-test mathematical model is substituted, so as to solve zero creep pair
The impact of certainty of measurement.
3rd, radiant type LOAD CELLS, has been ripe using X-ray or gamma-ray transducer measurement weight of material
Technology, but when being applied to air delivery pipe coal dust weight measurement, then because air delivery pipe diameter is big, wall thickness,
Cast iron materials, and the high temperature of coal dust, high pressure, high speed, high friction, the features such as coal amount is little, only with regard to cast iron
X-ray or gamma-rays all can be sponged by material, wall thickness about 20mm pipelines, measurement is carried out.
The present invention adopts special pipe jointer (see Fig. 5), is placed on radiation LOAD CELLS measurement
In area, to replace partial ventilation pipeline, the adapter is made from the few material of ray is absorbed, and through special
Different structure design and process.Additionally, using water-cooled measure etc., make adapter have high temperature resistant, it is high pressure resistant,
The features such as frictional force is little, absorption ray is few, to the measurement for solving the problems, such as air delivery pipe coal dust weight.
The invention discloses a kind of " multiple air delivery pipe equilibrium powder-supply systems ", installed in existing electric boiler
On coal dust preparation system some equipment, to adjust each air delivery pipe coal dust weight of control so as to which multiple wind send
In pipeline, coal dust weight is close, and reaches and realizes that equilibrium supplies powder.
A kind of " multiple air delivery pipes are balanced to supply powder control system ", its feature includes：
Multiple " air delivery pipe coal dust weight measurement instrument " (100A, 100B, 100C, 100D) or other
Air delivery pipe coal dust weight measurement instrument；
Device for measuring moisture (110), above run coal bin to the conveyer belt (2) between coal pulverizer,
For measuring raw coal moisture Mi；
With the weighing device (111) for adjusting belt speed function, installed in run coal bin and coal pulverizer it
Between belt below, for measuring, adjusting raw coal weight W controlled into coal pulverizerI raw coal；
Pulverized coal distributor with regulatory function (112), for adjusting into air delivery pipe coal dust weight
WI coal dusts；
Industrial control computer (113), for receive from " air delivery pipe coal dust weight measurement instrument (100),
That is (100A, 100B, 100C, 100D) coal dust weight signal (WIA coal dusts、WIB coal dusts、WIC coal dusts、
WID coal dusts), device for measuring moisture (110) moisture signal Mi, weight-measuring device (111) weight signal
WI raw coal, and control signal is sent to pulverized coal distributor (112), weight-measuring device (111).
Industrial control computer (113), according to the moisture signal M for receivingi, weight signal
WI raw coalWith raw coal weight set controlling value (WRaw coal control) definite value control is carried out to entering coal pulverizer raw coal weight
System；According to the W for receivingIA coal dusts、WIB coal dusts、WIC coal dusts、WID coal dustsAnd coal dust weight set controlling value
WCoal dust controlTo WIA coal dusts、WIB coal dusts、WIC coal dusts、WID coal dustsCarry out setting control [seeing Fig. 8, Fig. 9].
" multiple air delivery pipes supply powder control system " its feature is also resided in：
WIA coal dusts、WIB coal dusts、WIC coal dusts、WID coal dustsMeasurement mathematical model be：
W in formulaIA coal dusts、WIB coal dusts、WIC coal dusts、WID coal dustsFor the instantaneous value of Δ t time weight, WA coal dusts、WB coal dusts、WC coals Powder、WD coal dustsFor Δ t × m=t1The aggregate-value of time, m- cumulative numbers；
K in mathematical model is with Jing time interval (t1), coal pulverizer exports the weight of coal dust
(WCoal-grinding powder), and compare the value as standard value with each air delivery pipe coal dust weight measurement
：
In formula,
Meansigma methodss W of each air delivery pipe coal dust weight instantaneous valueCoal dust is averageFor：
Hypothesis regulating time is t4, acquisition time is Δ t, then times of collectionCollection N1Secondary each wind send
The meansigma methodss of pipeline powder coal weight aggregate-value are：
By WCoal dust is averageAs each air delivery pipe coal dust weight set controlling value WCoal dust control, Industrial Control Computer is according to each wind
Send pipeline powder coal weight set controlling value and each pipeline powder coal weight measurement WI coal dustsCalculate each pipeline
ΔWCoal dust=WCoal dust control-WI coal dusts(or Δ WCoal dust=WCoal dust control-WCoal dust)；According to Δ WCoal dustValue adjusts pulverized coal distributor (112)
Interior corresponding 112A, 112B, 112C, 112D (see Fig. 7), to the coal dust for increasing or decreasing each pipeline
Weight WI coal dusts(or WCoal dust), so as to be capable of achieving, each pipeline is balanced to supply powder [seeing Fig. 8]；
The characteristics of controlling into coal pulverizer raw coal weight
1) raw coal weight set controlling value (WRaw coal control) it is to be determined according to boiler heat load, and it is negative with heat
The change of lotus and change；
2) contained humidity weight, i.e. W to be deducted into coal pulverizer raw coal weightCoal=WRaw coal(1-Mi), industry
Control machine is according to WRaw coal controlAnd WCoalCalculate Δ WCoal=WRaw coal control-WCoal, according to Δ WCoalAdjust the skin of weighing device
Tape speed, to increase or decrease raw coal weight, makes WCoalWith WRaw coal controlIt is close, so as to realize raw coal
Weight setting control.Moisture free raw coal weight is controlled, the weight that coal pulverizer exports coal dust can be reduced
Fluctuation, improves the stability for powder.
3) autocorrection coefficient k functions, automatic Calibration time t of the instrument according to setting1, often through t1When
Between be spaced, automatically into calibrating procedure, that is, calculate
With WCoal-grinding powderAs standard value
：
kNewly=Δ k × k, by kNewlyThe k in coal dust weight measurement mathematical model is changed, Fig. 9 is given from dynamic(al) correction
The block diagram of coefficient k.
Description of the drawings
One coal-grinding mechanism powder powder-supply system capital equipment schematic diagram of the existing electric boilers of Fig. 1；
1 --- run coal bin；
2 --- conveyer belt；
3 --- feeder；
4 --- coal pulverizer；
5 --- blower fan；
6 --- apparatus for separating fine powder from coarst powder；
7 --- pulverized coal distributor；
8A, 8B, 8C, 8D --- wind is delivered coal powder pipeline；
9A, 9B, 9C, 9D --- burner；
10 --- boiler；
Fig. 2 air delivery pipe coal dust weight measurement instrument schematic diagrams；
101 --- the radiation source of radiation sensor；
102 --- the radiation detector of radiation sensor；
103 --- mounting bracket；
104 --- pipe jointer；
105 --- the ring flange of pipe jointer；
106 --- wind speed measuring device；
107 --- data acquisition process controller；
108 --- device for measuring moisture；
109 --- weighing device；
Fig. 3 enters coal pulverizer raw coal weight, makes coal dust weight and pulverized coal distributor, dispensed weight schematic diagram；
Fig. 4 coal pulverizer working times and powder time processed and its corresponding weight schematic diagram；
Fig. 4 (a) working times scheme；
t1--- the raw coal time (time of measuring or nominal time) is supplied to coal pulverizer；
t2--- coal pulverizer is entered into the time required to making coal dust from raw coal；
t3--- coal pulverizer supplies the powder time；
Fig. 4 (b) coal pulverizers are in t1At the end of time, into coal pulverizer raw coal weight, in t2In time,
Raw coal weight and the coal dust weight of output that coal pulverizer has.
Fig. 5 pipe jointer schematic diagrams；
Fig. 5 (a) front views, Fig. 5 (b) side views, Fig. 5 (c) A-A profiles；
The multiple air delivery pipes of Fig. 6 are balanced to supply powder control system schematic diagram；
100 --- air delivery pipe coal dust weight measurement instrument, i.e. 100A, 100B, 100C, 100D；
110 --- device for measuring moisture；
111 --- with the weighing device for adjusting belt speed function；
112 --- with the pulverized coal distributor for adjusting coal powder distribation function；
113 --- industrial control computer；
Fig. 7 has the pulverized coal distributor schematic diagram for adjusting coal powder distribation function；
112A --- adjust the W of pipeline 8A8A coal dusts；
112B --- adjust the W of pipeline 8B8B coal dusts；
113C --- adjust the W of pipeline 8C8C coal dusts；
114D --- adjust the W of pipeline 8D8D coal dusts；
The multiple air delivery pipes of Fig. 8 are balanced to supply powder control block diagram；
Fig. 8 (a) will be in regulating time t1It is interior, the meansigma methodss conduct of each air delivery pipe coal dust weight aggregate-value
Coal dust weight set controlling value, carries out the block diagram of setting control；
The meansigma methodss of the instantaneous value that each air delivery pipe is measured coal dust weight by Fig. 8 (b) are set as coal dust weight
Determining controlling value carries out the block diagram of setting control；
Fig. 9 enters the block diagram of coal pulverizer raw coal weight setting control and autocorrection coefficient k.
Specific embodiment
The present invention program is further illustrated with reference to accompanying drawing：
Fig. 1 is existing electric boiler, coal-grinding mechanism powder, a capital equipment schematic diagram for powder-supply system, is schemed
2 is " air delivery pipe coal dust weight measurement instrument ", installed in schematic diagram on existing pulverized coal preparation system equipment, the figure
" air delivery pipe coal dust weight measurement instrument " main device and part including constituting is given, wherein (101),
(102) constitute radiant type LOAD CELLS.
Existing radiant type LOAD CELLS has gamma-rays LOAD CELLS, X-ray LOAD CELLS, and they are equal
Category non-contact measurement, is not affected by coal fines high-temperature, high pressure, high friction.Gamma-ray transducer is penetrated with X
Line sensor is compared, gamma Rays poor stability, easily causes big security incident if any losing, additionally,
Energy of γ ray is high, resolving ability is low, therefore this patent is recommended using X-ray LOAD CELLS, x-ray source (101)
Choose lower powered, its high pressure ＜ 50kv, electric current ＜ 2mA；X-ray detector (102) adopts long ion chamber
Or array for ionization chamber or semiconductor detector or scintillation detector etc., more recommend long ion chamber or battle array here
Row ionization chamber.LOAD CELLS also can select other noncontacting proximity sensors, such as microwave LOAD CELLS certainly,
It is also mature technology；Wind speed measuring device has a polytype, such as backing tube, bourdon's tube, pitot tube, double
Venturi tube etc., recommendation adopt backing tube；Device for measuring moisture selects microwave measurement for moisture content instrument；Weight measurement
Device selects the composition of belted electronic balance, air delivery pipe coal dust weight measurement instrument to have multiple choices, and this selection is
Preferred version.
Solution never stops production and demarcates and in given nominal time t1Interior automatic Calibration, is the inventive point of this patent.
Fig. 4 (a) gives the time t of coal pulverizer operation1、t2、t3Relation schematic diagram, Fig. 4 (b) give t1
At the end of, the relation schematic diagram between raw coal weight, coal dust weight is not difficult to try to achieve in t3In time, coal-grinding
Machine exports coal dust weight WCoal-grinding powder, and with weight WCoal-grinding powderRealize by setting nominal time t for standard value1From
It is dynamic that k in apparatus measures mathematical model is demarcated and corrected.
Fig. 5 gives the pipe jointer figure of this patent, and its length l=100～300mm, l are shorter, resistance to compression
Property it is just strong, when l is long, reinforcement can be laid on tube wall, to improve comprcssive strength, adapter internal diameter sets
That what is counted will be less times greater than air delivery pipe internal diameter (d1), i.e. d=d1+Δd；Δ d=0.5～2mm, internal diameter will be polished
And special handling, to reduce frictional force, tube wall (b) is as far as possible thin, b=2～6mm, to reduce to X
The absorption of ray.Additionally, also take water-cooled measure etc., so far make adapter have high temperature resistant, it is high pressure resistant,
Rub resistance.Above measure is to realizing creating advantage to coal dust weight measurement using X-ray sensing.
Fig. 6 gives " equilibrium of multiple air delivery pipes supplies powder control system " schematic diagram, it should be noted that：
The pulverized coal distributor (7) in Fig. 2, apparatus are instead of with the pulverized coal distributor with regulatory function (112)
The weighing device (109) that the weighing device (111) for having speed-regulating function is instead of in Fig. 2.In addition, also increasing
Industrial Control Computer (113) is added, it is controlled with the data acquisition process of multiple pipeline powder coal weight measurement instrument
Device forms host computer and slave computer structure.Equilibrium has two control loops for powder control system：1) enter coal-grinding
The automatic Calibration (see Fig. 9) of machine raw coal weight setting control and coefficient k；2) multiple wind are delivered coal grain weight amount
Balance route.Fig. 8 (a), 8 (b) give the balanced control block diagram for powder, and Fig. 7 gives can
Adjust pulverized coal distributor schematic diagram, it be using adjust in allotter (112) leaf grating (112A, 112B,
112C, 112D) angle realize adjust into multiple pipelines coal dust amount.Fig. 9 is given into coal pulverizer raw coal
Control block diagram.
The present invention solves the problems, such as that the multiple air delivery pipes for existing for many years are uneven for powder, improves steam coal
Powder burning quality and efficiency, prevent in boiler flame of centre skew and reduce water-cooling wall slagging scorification, so as to improve
The stability of boiler operatiopn, safety, economy, it is significant to energy-saving and emission-reduction.
Claims (11)
1. a kind of " air delivery pipe coal dust weight measurement instrument ", its feature includes：
Radiant type LOAD CELLS (radiation source, radiation detector), for measuring coal dust weight, is given
Weight signal U1、U0；
Mounting bracket, for installing radiation source and radiation detector；
Pipe jointer, for connecting the air delivery pipe at two ends in measurement zone；
Wind speed measuring device, for measuring the wind speed (V in air delivery pipei)；
Device for measuring moisture, for measuring the moisture (M in raw coal1)；
Weighing device, for measuring raw coal weight (WI raw coal)；
Data acquisition process controller, for receiving weight signal (Ui、U0), wind velocity signal (Vi)、
Moisture signal Mi, raw coal weight signal (WI raw coal),
Data acquisition process controller, according to weight signal (Ui、U0), wind velocity signal (Vi), by title
Weight mathematical model calculates coal dust weight WI coal dusts。
2. according to claim 1, its feature is that mathematical model of weighing is：
W in formulaI coal dusts- instantaneous weight；
WCoal dust- cumulative weight；
K- calibration coefficients；
U0Detector output signal during-coal dust free；
Ui- detector output signal when having coal dust；
Δ t- acquisition times；
M- times of collection.
3. according to claim 1,2, data acquisition process controller, according to moisture signal MiAnd weight
Amount signal WI raw coal, calculated into coal pulverizer raw coal weight W in real timeRaw coal, moisture weight, coal pulverizer
In powder time t processed2Inside there is raw coal weight WCoal pulverizerCoal dust weight W is exported with coal pulverizerCoal-grinding powder, which is special
Point is that the calibration coefficient k weighed in mathematical model is to use WCoal-grinding powderAs standard value, with
Coal dust weight (the W that " air delivery pipe coal dust weight measurement instrument " is measuredCoal dust)：
4. according to claim 3, its feature is to export coal dust weight：
In formula,t1--- time of measuring,
t2--- the powder time processed.
5. according to claim 2, to weigh and coefficient k is demarcated in mathematical model, its feature is that data are adopted
Collection processing controller, according to the automatic Calibration time t of setting1, per Jing t1Time Calculation goes out former into coal pulverizer
Coal weightIn t2In time, coal pulverizer has raw coal weightAnd output coal dust weightWith WCoal-grinding powderFor standard value, with wind
Send coal dust weight W that weight measurement instrument is measured pipeline powder coalCoal dust,
ComparekNewly=Δ k × k, with kNewlyK in replacement last time mathematical model,
K is corrected automatically with Δ k every time.
6. according to claim 1, its feature is, pipe jointer length 1=100～300mm, wall
Thick b=2～6mm, internal diameter d=d1+ Δ d, d1- air delivery pipe internal diameter, Δ d=0.5～2mm, with to spoke
Penetrate the few material of absorption to make.
7. according to claim 1, radiation sensor is adopted using X ray sensor, moisture weight-measuring device
Belted electronic balance is adopted with microwave measurement for moisture content device, weighing device.
8. a kind of multiple pipelines are balanced supplies powder control system, its feature to include：
" air delivery pipe coal dust weight measurement instrument " or other types described in multiple " claim 1-7 "
Air delivery pipe coal dust weight measurement instrument, for measuring air delivery pipe coal dust weight and providing coal dust
Weight signal WI1 coal dusts、WI2 coal dusts……WIn coal dusts(n- number of tubes)；
Device for measuring moisture, for measuring the moisture in raw coal；
Weighing device with regulating weight function, for measuring, adjusting control raw coal weight；
Pulverized coal distributor with regulatory function, for adjusting into air delivery pipe coal dust amount；
Industrial control computer, for receiving the coal dust weight of multiple air delivery pipe coal dust weight measurement instrument
Signal (WI1 coal dusts、WI2 coal dusts……WIn coal dusts), moisture signal Mi, raw coal weight signal WI raw coal, and
Control signal is sent to pulverized coal distributor and weighing device；
Industrial Control Computer is according to the moisture signal M for receivingi, weight signal WI raw coalWith raw coal weight set control
Value W processedRaw coal control, setting control is carried out to entering coal pulverizer raw coal weight；According to the coal dust weight for receiving
Signal (WI1 coal dusts、WI2 coal dusts……WIn coal dusts) and coal dust weight set controlling value WRaw coal control, to each pipe
Road coal dust weight carries out setting control.
9. according to claim 8, its feature is：Multiple air delivery pipe coal dust weight measurement instrument are measured
Coal dust weight WI1 coal dusts、WI2 coal dusts……WIn coal dustsMathematical model be：
…………………………………………………··
Wherein in mathematical model, k is to export coal dust weight WCoal-grinding powderFor standard value, survey with multiple air delivery pipes
The coal dust weight of amountCompare and determine, its k is：
In formula, m is times of collection,t1--- nominal time, Δ t --- acquisition time.
10. according to claim 9, its feature is：When Industrial Control Computer is according to the automatic Calibration for setting
Between t1, often through t1Calibration coefficient k is corrected once, correction factor Δ k is：
kNewly=Δ k × k, uses k every timeNewlyReplace the k of last time,
Realize the automatic amendment to k.
11. according to claim 8, and its feature is：Raw coal weight set controlling value WRaw coal controlIt is according to pot
Thermic load needed for stove determines that industrial control computer is according to WRaw coal controlWith moisture signal Mi, raw coal weight
Signal WI raw coal, calculate WI coals=WI raw coal(1-Mi)、ΔWI coals=WRaw coal control-WI coals, industry control
Machine processed is according to Δ WI coalsRegulation, control signal are sent to weighing device, to increase or decrease raw coal weight,
Make WI coalsWith WRaw coal controlIt is close, so as to realize raw coal weight setting control；
Coal dust weight set controlling value WCoal dust controlIt is according to each air delivery pipe coal dust weight (WI1 coal dusts、
WI2 coal dusts……WIn coal dusts) meansigma methodss (WCoal dust is average) determine, i.e.,：
Or
In formula,t1--- regulating time, Δ t --- acquisition time；
Industrial Control Computer is according to coal dust weight setpoint value WCoal dust controlDeliver coal powder pipeline coal dust weight with each wind
Value (WI1 coal dusts、WI2 coal dusts……WIn coal dusts) orMeter
Calculate the Δ W of each pipeline1 coal dust……ΔWN coal dusts, further according to the corresponding Δ W of each pipelineCoal dustTo with regulation work(
The pulverized coal distributor of energy sends regulation, control signal, to increase or decrease coal dust weight, makes each wind
Send pipeline powder coal weight WI coal dustsOrWI coal dustsWith WCoal dust controlIt is close, so as to realize that each pipeline is balanced
For powder.
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| CN111366229A (en) * | 2019-09-20 | 2020-07-03 | 沈忠东 | Method for recalibrating metering equipment by buffer bin |
| CN112097236A (en) * | 2020-09-24 | 2020-12-18 | 尚尔发 | Automatic energy-saving control system of electrical engineering suitable for thermal power plant |
| CN114353857A (en) * | 2020-10-13 | 2022-04-15 | 邸生才 | Wind and powder two-phase flow measuring system of wind conveying pipeline and two-phase flow control system |
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| CN106556026B (en) | 2019-10-11 |
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Effective date of registration: 20210525 Address after: 100037, Beijing, Xicheng District, 2 million meters in the middle of the building, 5 doors, room 402 Patentee after: Di Shengcai Patentee after: Hebei bangruida Technology Co.,Ltd. Address before: 100037, Beijing, Xicheng District, 2 million meters in the middle of the building, 5 doors, room 402 Patentee before: Di Shengcai |