CA1189100A - Method for measuring integrated weight of particulate feed material - Google Patents
Method for measuring integrated weight of particulate feed materialInfo
- Publication number
- CA1189100A CA1189100A CA000410085A CA410085A CA1189100A CA 1189100 A CA1189100 A CA 1189100A CA 000410085 A CA000410085 A CA 000410085A CA 410085 A CA410085 A CA 410085A CA 1189100 A CA1189100 A CA 1189100A
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- Canada
- Prior art keywords
- powder
- replenishing
- particulate material
- container
- weight
- Prior art date
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- Weight Measurement For Supplying Or Discharging Of Specified Amounts Of Material (AREA)
Abstract
ABSTRACT:
In the measurement of an integrated weight of a particulate material being continuously fed to a powder treating system or the like by providing a powder delivery port in a lower portion of a pressurized powder feed con-tainer for supplying the particulate material to a blowing port of the treating system, connecting a pressurized powder replenishing container to an upper portion of the powder feed container for replenishing same with the particulate material under pressure, continuously feeding the particulate material along with part of a pressurized carrier gas introduced into the delivery port of the pressurized powder feed container, communicating the powder replenishing and feed containers with each other in a suitable timing for replenishing the particulate material, and sequentially measuring the weights of powder contents in the containers to measure the integrated weight of the particulate material fed through the delivery port during a time period of operation, a method comprising the steps of: adding up batchwise the weight of each powder replenishment from the replenishing container to the feed container to obtain the total weight of powder replenishment;
subtracting the sum of the weights of momentary powder contents of the containers from the total weight of powder replenishment when the measurement is made in con-currence with a replenishing operation; and substracting the weight of momentary powder content of the pressurized powder feed container from the total weight of powder replenishment when the measurement is made at a time point falling outside the time period of a replenishing operation.
In the measurement of an integrated weight of a particulate material being continuously fed to a powder treating system or the like by providing a powder delivery port in a lower portion of a pressurized powder feed con-tainer for supplying the particulate material to a blowing port of the treating system, connecting a pressurized powder replenishing container to an upper portion of the powder feed container for replenishing same with the particulate material under pressure, continuously feeding the particulate material along with part of a pressurized carrier gas introduced into the delivery port of the pressurized powder feed container, communicating the powder replenishing and feed containers with each other in a suitable timing for replenishing the particulate material, and sequentially measuring the weights of powder contents in the containers to measure the integrated weight of the particulate material fed through the delivery port during a time period of operation, a method comprising the steps of: adding up batchwise the weight of each powder replenishment from the replenishing container to the feed container to obtain the total weight of powder replenishment;
subtracting the sum of the weights of momentary powder contents of the containers from the total weight of powder replenishment when the measurement is made in con-currence with a replenishing operation; and substracting the weight of momentary powder content of the pressurized powder feed container from the total weight of powder replenishment when the measurement is made at a time point falling outside the time period of a replenishing operation.
Description
~ ~sf~ 3 -- 2 :
BACKGROVND OF THE IN~NTION
_ _ _ (1) Field of -the Invention This invention relates to a method for measuring an integra-ted weight of a particulate ma~eLial in a given past period of time while the parti.culate material is being conti.nuously fed to a powder -treating system or the like.
BACKGROVND OF THE IN~NTION
_ _ _ (1) Field of -the Invention This invention relates to a method for measuring an integra-ted weight of a particulate ma~eLial in a given past period of time while the parti.culate material is being conti.nuously fed to a powder -treating system or the like.
(2) Descripti.on of the Prior Art There are known in the art various feed mechanisms for particulate or powdery materials (hereinafter referred -to simply as l'powder" for brevi-ty), of which the systems utilizing fluid pressure have a number of advan-tages over gravitational or mechanical feed systems, including a longer transfer distance of the particulate material and ability of continuous quanti~ative feed. A powder transfer over a long distance, however, gives rise to large pressure losses in the feed l.ine, necessitating to feed the material under an extremely high pressure especially in a case where a high pressure opera ion is intended at the end of the feed line, under a pressure in excess of the pressure on the receiving side ih consi.dera-tion of the pressure losses. In such a case, it becomes necessary to raise the pressure of the carrler gas source and to increase the internal pressure of the powder feed r 1 container which delivers the particulate material, in addition -to -the need for the provision of a powder re-plenishing con-tainer for replenishing -the particulate material to the powder feed con-tainer and desirably a container for holding a stock of the particulate material for supply to -the replenishing container. The parti.culate material is thus fed successively from the stock container to the replenishing container (hereinafter referred to as "s-tock feed"), from the replenishing con-tainer to the feed container (hereinafter referred to as "powder replenish--ment") and from the feed contai.ner -to a powder treating system (hereinafter referred to as "powder feed").
Besides, it is the general prac-tice to feed the s-tock powder under the arnbient pressure while intermittently pressuri2ing the replenishing container each -time repleni shing the feed container which continuously feed the powder under pressure, so that a complicate pressure control is lnvolved in the transfer of the particulate material.
However, there has been known no method or mealls for accurately ~leasuring the weight of the par-ticulate feed material flowing along the afore-mentioned routes, for example, a method for accurately measuring the total weigh~ of a particulate material which was fed in a given past period of time, making it difficul-t to irnprove the accuracy of operation control on the side of the I
~ s~
1 powder treating system.
S~MARY OF THE IN~ENTION
With the foregoing situations in view, the presen-t invention has as its objec-t the provision of a method for measuring at an arbltrary time point the total weigh-t of a particulate material which has been fed in a given pas-t period o~ time.
According to the present inven-tion, -this object is achieved by a method which inclu~es the steps of providiny a powder deli-very port in a lower porti.on of a powder Eeed container maintained under pressure for supplying a particulate material to a powder blowing port of a powder treating system; connecting to an upper portion of the powder feed container a powder replenishing container for replenishing the powder feed contain~r with fresh particulate material; continuously discharying the particulate material from the pow~er feed con-tainer by entrainment in a pressurized carrier gas lntr~duced i.nto the powder delivering port; co~municating the powder replenishing and feed containers with each o-ther in a suitable timing for replenishing the particulate rnaterial;
and sequentially measuring the weights of powder conten-ts in the respective containers to measure the integrated weight of the particulate material fed through the powder
Besides, it is the general prac-tice to feed the s-tock powder under the arnbient pressure while intermittently pressuri2ing the replenishing container each -time repleni shing the feed container which continuously feed the powder under pressure, so that a complicate pressure control is lnvolved in the transfer of the particulate material.
However, there has been known no method or mealls for accurately ~leasuring the weight of the par-ticulate feed material flowing along the afore-mentioned routes, for example, a method for accurately measuring the total weigh~ of a particulate material which was fed in a given past period of time, making it difficul-t to irnprove the accuracy of operation control on the side of the I
~ s~
1 powder treating system.
S~MARY OF THE IN~ENTION
With the foregoing situations in view, the presen-t invention has as its objec-t the provision of a method for measuring at an arbltrary time point the total weigh-t of a particulate material which has been fed in a given pas-t period o~ time.
According to the present inven-tion, -this object is achieved by a method which inclu~es the steps of providiny a powder deli-very port in a lower porti.on of a powder Eeed container maintained under pressure for supplying a particulate material to a powder blowing port of a powder treating system; connecting to an upper portion of the powder feed container a powder replenishing container for replenishing the powder feed contain~r with fresh particulate material; continuously discharying the particulate material from the pow~er feed con-tainer by entrainment in a pressurized carrier gas lntr~duced i.nto the powder delivering port; co~municating the powder replenishing and feed containers with each o-ther in a suitable timing for replenishing the particulate rnaterial;
and sequentially measuring the weights of powder conten-ts in the respective containers to measure the integrated weight of the particulate material fed through the powder
3~
1 delivery por-t during a time period of operation; the method being characterized by the steps of: adding up ba-tchwise the weight of each powder replenishment from the replenishing container to the powder feed container to obtain the total weight of powder replenishment;
subtracting the sum of weights of momentary powder con-tents in the respective containers from the total weight of replenishment when the measurement takes place con- 1.
currently with the replenishing operation; and subtracting the weight of ~he momentary powder content in the powder feed container from the total weight of replenishment when the measurement takes place at a time point outside a time period of a replenishing operation to obtain an integratad weight of the feed of the particulate material in a given time period.
The ahove and other objects, features and advan~
tages of the present invention will become apparent from the following description and appended claims, taken in conjunction with the accompanying drawing which shows by way of example a preferred emhodiment of the.invention.
BRIEF DESCRIPTION OF THE D~AWING
In the accompanying drawing:
the sole figure is a diagrammatic illustration o~ a typical powder control system incorporating the i.~
I method of the present invention.
DESCRIPTION OF PREF'ERRED EMBODIMENT
The method of -the invention and its effec-ts are hereafter described more particu]arl~ by way oE a powder control system shown in the drawing.
For example, the fine coal which is obtained by pulverization of coal 1 is stored in a stock contalner 2 under the atomspheric pressure, and fed to a replenishing container 3 by opening a valve 9 when the latter becomes empty or short in i-ts powder con-ten-t. On such an occa- j tion, the valve 10 is opened while closing the valves 11 and 12, with the replenishing container 3 opened to -the atmosphere. On the other hand, the powder feed container
1 delivery por-t during a time period of operation; the method being characterized by the steps of: adding up ba-tchwise the weight of each powder replenishment from the replenishing container to the powder feed container to obtain the total weight of powder replenishment;
subtracting the sum of weights of momentary powder con-tents in the respective containers from the total weight of replenishment when the measurement takes place con- 1.
currently with the replenishing operation; and subtracting the weight of ~he momentary powder content in the powder feed container from the total weight of replenishment when the measurement takes place at a time point outside a time period of a replenishing operation to obtain an integratad weight of the feed of the particulate material in a given time period.
The ahove and other objects, features and advan~
tages of the present invention will become apparent from the following description and appended claims, taken in conjunction with the accompanying drawing which shows by way of example a preferred emhodiment of the.invention.
BRIEF DESCRIPTION OF THE D~AWING
In the accompanying drawing:
the sole figure is a diagrammatic illustration o~ a typical powder control system incorporating the i.~
I method of the present invention.
DESCRIPTION OF PREF'ERRED EMBODIMENT
The method of -the invention and its effec-ts are hereafter described more particu]arl~ by way oE a powder control system shown in the drawing.
For example, the fine coal which is obtained by pulverization of coal 1 is stored in a stock contalner 2 under the atomspheric pressure, and fed to a replenishing container 3 by opening a valve 9 when the latter becomes empty or short in i-ts powder con-ten-t. On such an occa- j tion, the valve 10 is opened while closing the valves 11 and 12, with the replenishing container 3 opened to -the atmosphere. On the other hand, the powder feed container
4 which holds the particulate ma-terial is pressurized by a carrier gas which is in-troduced thereinto ln the direc-tion of arrow A (the carrier gas heing preferred to be N2 gas or an inert gas like rare yas in the case of fir~e coal). However, as the valve at the powd~ delivery port 7 is constantly open, the powder particles drop in pressurized state toward a -tee joint 15 at the j~mction.
Although the powder in the con-tainer 4 is held under pressure, it is kept from being consolidated b~ the agita-ting action of -the carrier gas which is blowr. in from a lower portion of the container 4. ThereEore, the l powder which is in the lower por-tion of the container 4 falls, entrained in part of the blown carrier gas. On the other hand, the blown gas flow in the direc-ti.on of arrow B, wh:ich is controlled by a valve 14, is mixed wi~h the falliny powder particles and carrier gas at the tee join-t l.~ and blown into a powder treating system 16.
In a ca.se where the powder treating system has a plural number of tuyeres like a blas-t furnace, there may be provlded a distributor downstream of the powder delivery port 7 or alternativel.y a plural n~er oE delivery ports 7 in the lower portion of the feed con-tainer 4 (corres-pondingly to a similar number of tuyeres or groups of tuyeres), connecting the respective delivery por-ts by separate tee joints 15 to provide powder blowing lines which are completely independent of each other and easily controllable separately in considerati.on of the differences in pressure loss resulting from the differen- ¦
ces in length of the blow lines to the respective tuyeres and the bent portions contained therein.
It is necessary to make preparations for the powder replenishment from the container 3 before the powder feed container 4 becomes short of the particulate material as a result of the continuous feed. Namely, the particulate material which is received by the reple-nishing container 3 under the atmospheric pressure has 1 to be pressurized to a level proximate to the internal pressure of -the container 4, increasing the pressure of the continer 3 by opening the valve 11 with the valves 9, 10 and 12 in closed sta-te. Upon detecti.on of a dimi-nution of the particulate material in -the contairler 4 beyond a predetermined amoun-t, -the valve l7 is opened to start replenishment while continuedly feeding the parti-culate material through -the delivery port 7. Whereupon, there occur a pressure drop and a pressure increase in the containers 3 and 4, respectively, so that the valve 12 is opened to equalize the pressures i.n the -two con-tainers. As soon as the powder replenishment is finished, the valves 11, 12 and 17 are closed, and the valve 10 is slowly opened to release the pressure of the container 3 for equalization with the atmospheric pressure, followed by opening of the valve 9 to refill the parti.culate material from the container 2.
Therefore, if it is desired to measure -the integrated weight of the particulate feed material irl a giv~en past period of time, as intended by the present in~ention, a rouyh value can be ob-tained by summing up -the amounts of replenishment from the container 3 -to the contai.ner 4. However, more elaborate calcula-tions are required to measure the integrated weight of the powder feed in a shorter time period or between arbitrary -time 1 points. I~ addi-tion, the powder replenishment becomes necessary at a high frequency depending upon the capa-cities of the containers 3 and 4 and the feed rate of the particula-te material., -taking a rela-tively long time for each replenishing operation. Therefore, the desired time points of measuremen-t may of-ten overlap a period of the replenishing operat'on. Even on such occasions, the measuremen-t should give an e~act value in order to achieve the object of the presen-t invention, by resorting to the procedures as descri.bed hereinafter.
The replenishing container 3 and feed container 4 are connected with each other through an expansion joint 5 and supported through load detecting means such as load cells 6 and 8, respectively. Since the weights of the containers 3 and 4 i.ncludi.ng valves and other attdched elements can be known, the weights of the particulate material in the containers 3 and 4 are obtained by subtracting the known weights from the values read by the load cells 6 and 8~ The resulting values may be employed directly but it is desired to add the following corrections for enhancing -the accuracy of measurement.
Firstly, as the powder feed container 4 is cons-tantly maintained under pressure, i-t is necessary to make corrections in consideration of the load of the pressure and the reaction of the replenishing con-tainer. For this 3~
- 10 ~
1 purpose, the reading of a pressure gauge lg is suppl:ied to weight computing sections ~7 and 18 to make a corres~
ponding correction toward the positive (_L) end for the powder weight in the con-taine:r 3 and toward the r~egative (-) end for the powder weight in the con-tainer 4. Further, the contalllers 3 and 4 are connec-ted wi-th each other through a fle~ible joint 5 so that the readings of -the load cells 6 and 8 are biased ~y the spring reactions which act on the containers 3 and 4 due to vibrations occurring during the replenishing operation. To make correc-tions in this regard, the reactions resulting from contraction and expansion of the joint 5 are measured by a strain gauge 20 or the like, sending a signal of posi-tive compensation (~) to the weigh-t computing section 17 and a signal of negative compensation (-) to -the weight computing section 18. The resul-ting signals are converted into electric current signals, of which:
(1) The sum of the weights of momentary powder contents in containers 3 and 4 is considered as the weight of currently available powdersupply in the case of a measurement concurring a replenishing operation from the container 3 to 4; and (2) The weight of the momentary powder con-tent in the container 4 is regarded as the weigh-t of currently available powder supply in the case of a measurement no-t ~, ' 1 concurring the replenishing operation.
Therefore, in order to get at a gi-~en time point the total weight of powder supply since -the star-t of operation, -the weight of the afore-men-tioned curren-tly available powder supply at that time poin-t is ~s-tracted from the total weight of replenishments from the container 3 to ~. Namely, according to the present inven-tion, the weight of available powder supply to be sub-tracted i.s varied depending upon whether or not the time point of measurement falls in a period of replenishment, -thereby to permit accurate measurement a-t an arbitrary time point irrespective of the replenishing operation. However, it is recommen~ed not to make the measurement or the above-men-tioned calculations in the initial stage of the replenishment (normally until a lapse of 10 - 15 seconds) from the container 3 to 4, in which the reading of the load cell 8 is fluctuated by the impacts of -the falling particulate material and therefore substantial errors creep into the measured ~alues. The -total weight of replenishments in the past period of operation can be obtained by adding up batchwise the weight of cach reple-nishment, namely, by integrati.ng the weight of particulate material as received under the atmospheric pressure after subtraction of the weight of residual powder in the replenishing container at the end of the replenishing operation.
~ L~
:1 Thus, the total weight of powde~ supply frorn the very s-tart of operation can be ob-tai.ned by the fore-going calculations. For example, if the total weight o:E
powder supply is fou:nd to be Wa at a time point a and -t.o be Wb 30 minutes or 1 hour la-ter at a time point b, the weight of the powder supply during the time interval ~f measure ment (during the ti.me of b - a) is expressed by Wb Wa Namely, according to the present invention, i-t has become possible to measure accura-tely the lntegra-ted weigh-t of pvwder feed from the starting point of the operation~
Consequently, if the measuremen-t is effected at predeter-mined time points or at suitable time intervals, an exact weight of powder feed between -two selected time points can be obtained by calculating the difference between the integrated weights at, that ti.me points. I
It will be appreciated :Erom the foregoing des- ¦;
cription that -the method of the present i.nven-ti.on always 1, ensures correct measurement of the weigh~, of powder :Eeed in a past time period irrespecti~e of the.tirning of measurement.
Although the powder in the con-tainer 4 is held under pressure, it is kept from being consolidated b~ the agita-ting action of -the carrier gas which is blowr. in from a lower portion of the container 4. ThereEore, the l powder which is in the lower por-tion of the container 4 falls, entrained in part of the blown carrier gas. On the other hand, the blown gas flow in the direc-ti.on of arrow B, wh:ich is controlled by a valve 14, is mixed wi~h the falliny powder particles and carrier gas at the tee join-t l.~ and blown into a powder treating system 16.
In a ca.se where the powder treating system has a plural number of tuyeres like a blas-t furnace, there may be provlded a distributor downstream of the powder delivery port 7 or alternativel.y a plural n~er oE delivery ports 7 in the lower portion of the feed con-tainer 4 (corres-pondingly to a similar number of tuyeres or groups of tuyeres), connecting the respective delivery por-ts by separate tee joints 15 to provide powder blowing lines which are completely independent of each other and easily controllable separately in considerati.on of the differences in pressure loss resulting from the differen- ¦
ces in length of the blow lines to the respective tuyeres and the bent portions contained therein.
It is necessary to make preparations for the powder replenishment from the container 3 before the powder feed container 4 becomes short of the particulate material as a result of the continuous feed. Namely, the particulate material which is received by the reple-nishing container 3 under the atmospheric pressure has 1 to be pressurized to a level proximate to the internal pressure of -the container 4, increasing the pressure of the continer 3 by opening the valve 11 with the valves 9, 10 and 12 in closed sta-te. Upon detecti.on of a dimi-nution of the particulate material in -the contairler 4 beyond a predetermined amoun-t, -the valve l7 is opened to start replenishment while continuedly feeding the parti-culate material through -the delivery port 7. Whereupon, there occur a pressure drop and a pressure increase in the containers 3 and 4, respectively, so that the valve 12 is opened to equalize the pressures i.n the -two con-tainers. As soon as the powder replenishment is finished, the valves 11, 12 and 17 are closed, and the valve 10 is slowly opened to release the pressure of the container 3 for equalization with the atmospheric pressure, followed by opening of the valve 9 to refill the parti.culate material from the container 2.
Therefore, if it is desired to measure -the integrated weight of the particulate feed material irl a giv~en past period of time, as intended by the present in~ention, a rouyh value can be ob-tained by summing up -the amounts of replenishment from the container 3 -to the contai.ner 4. However, more elaborate calcula-tions are required to measure the integrated weight of the powder feed in a shorter time period or between arbitrary -time 1 points. I~ addi-tion, the powder replenishment becomes necessary at a high frequency depending upon the capa-cities of the containers 3 and 4 and the feed rate of the particula-te material., -taking a rela-tively long time for each replenishing operation. Therefore, the desired time points of measuremen-t may of-ten overlap a period of the replenishing operat'on. Even on such occasions, the measuremen-t should give an e~act value in order to achieve the object of the presen-t invention, by resorting to the procedures as descri.bed hereinafter.
The replenishing container 3 and feed container 4 are connected with each other through an expansion joint 5 and supported through load detecting means such as load cells 6 and 8, respectively. Since the weights of the containers 3 and 4 i.ncludi.ng valves and other attdched elements can be known, the weights of the particulate material in the containers 3 and 4 are obtained by subtracting the known weights from the values read by the load cells 6 and 8~ The resulting values may be employed directly but it is desired to add the following corrections for enhancing -the accuracy of measurement.
Firstly, as the powder feed container 4 is cons-tantly maintained under pressure, i-t is necessary to make corrections in consideration of the load of the pressure and the reaction of the replenishing con-tainer. For this 3~
- 10 ~
1 purpose, the reading of a pressure gauge lg is suppl:ied to weight computing sections ~7 and 18 to make a corres~
ponding correction toward the positive (_L) end for the powder weight in the con-taine:r 3 and toward the r~egative (-) end for the powder weight in the con-tainer 4. Further, the contalllers 3 and 4 are connec-ted wi-th each other through a fle~ible joint 5 so that the readings of -the load cells 6 and 8 are biased ~y the spring reactions which act on the containers 3 and 4 due to vibrations occurring during the replenishing operation. To make correc-tions in this regard, the reactions resulting from contraction and expansion of the joint 5 are measured by a strain gauge 20 or the like, sending a signal of posi-tive compensation (~) to the weigh-t computing section 17 and a signal of negative compensation (-) to -the weight computing section 18. The resul-ting signals are converted into electric current signals, of which:
(1) The sum of the weights of momentary powder contents in containers 3 and 4 is considered as the weight of currently available powdersupply in the case of a measurement concurring a replenishing operation from the container 3 to 4; and (2) The weight of the momentary powder con-tent in the container 4 is regarded as the weigh-t of currently available powder supply in the case of a measurement no-t ~, ' 1 concurring the replenishing operation.
Therefore, in order to get at a gi-~en time point the total weight of powder supply since -the star-t of operation, -the weight of the afore-men-tioned curren-tly available powder supply at that time poin-t is ~s-tracted from the total weight of replenishments from the container 3 to ~. Namely, according to the present inven-tion, the weight of available powder supply to be sub-tracted i.s varied depending upon whether or not the time point of measurement falls in a period of replenishment, -thereby to permit accurate measurement a-t an arbitrary time point irrespective of the replenishing operation. However, it is recommen~ed not to make the measurement or the above-men-tioned calculations in the initial stage of the replenishment (normally until a lapse of 10 - 15 seconds) from the container 3 to 4, in which the reading of the load cell 8 is fluctuated by the impacts of -the falling particulate material and therefore substantial errors creep into the measured ~alues. The -total weight of replenishments in the past period of operation can be obtained by adding up batchwise the weight of cach reple-nishment, namely, by integrati.ng the weight of particulate material as received under the atmospheric pressure after subtraction of the weight of residual powder in the replenishing container at the end of the replenishing operation.
~ L~
:1 Thus, the total weight of powde~ supply frorn the very s-tart of operation can be ob-tai.ned by the fore-going calculations. For example, if the total weight o:E
powder supply is fou:nd to be Wa at a time point a and -t.o be Wb 30 minutes or 1 hour la-ter at a time point b, the weight of the powder supply during the time interval ~f measure ment (during the ti.me of b - a) is expressed by Wb Wa Namely, according to the present invention, i-t has become possible to measure accura-tely the lntegra-ted weigh-t of pvwder feed from the starting point of the operation~
Consequently, if the measuremen-t is effected at predeter-mined time points or at suitable time intervals, an exact weight of powder feed between -two selected time points can be obtained by calculating the difference between the integrated weights at, that ti.me points. I
It will be appreciated :Erom the foregoing des- ¦;
cription that -the method of the present i.nven-ti.on always 1, ensures correct measurement of the weigh~, of powder :Eeed in a past time period irrespecti~e of the.tirning of measurement.
Claims (3)
1. In a method for measuring an integrated weight of a particulate material being continuously fed to a powder treating system or the like by providing a powder delivery port in a lower portion of a pressurized powder feed container for supplying said particulate material into a blowing port of said treating system, connecting a pressurized powder replenishing container to an upper portion of said powder feed container for replenishing same with said particulate material under pressure, continuously feeding the particulate material along with part of a pressurized carrier gas introduced into said delivery port of said pressurized powder feed container, communicating said powder replenishing and feed containers with each other in a suitable timing for replenishing said particulate material, and sequentially measuring the weights of powder contents in said containers to measure the integrated weight of the particulate material fed through said delivery port during a time period of operation, a method comprising the steps of:
adding up batchwise the weight of each powder replenishment from said replenishing container to said feed container to obtain the total weight of powder replenishment;
subtracting the sum of the weights of momentary powder contents of said containers from said total weight of powder replenishment when the measurement is made in concurrence with a replenishing operation; and subtracting the weight of momentary powder content of said powder feed container from said total weight of powder replenishment when the measurement is made at a time point falling outside the time period of a replenish-ing operation.
adding up batchwise the weight of each powder replenishment from said replenishing container to said feed container to obtain the total weight of powder replenishment;
subtracting the sum of the weights of momentary powder contents of said containers from said total weight of powder replenishment when the measurement is made in concurrence with a replenishing operation; and subtracting the weight of momentary powder content of said powder feed container from said total weight of powder replenishment when the measurement is made at a time point falling outside the time period of a replenish-ing operation.
2. A method as set forth in claim 1, wherein said pressurized powder replenishing and feed containers are connected with each other by an expansible joint and supported in position respectively through a load detect-ing means to detect the weights of powder contents in the respective containers with compensations for varia-tions attributable to the pressurization of said feed container and displacements of said expansible joint.
3. A method as set forth in claim 1, wherein the measurement is reserved in the initial stage of a reple-nishing operation from said replenishing container to said feed container until the reading of the weight of powder content in said pressurized feed container settles down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000410085A CA1189100A (en) | 1982-08-25 | 1982-08-25 | Method for measuring integrated weight of particulate feed material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000410085A CA1189100A (en) | 1982-08-25 | 1982-08-25 | Method for measuring integrated weight of particulate feed material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1189100A true CA1189100A (en) | 1985-06-18 |
Family
ID=4123477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000410085A Expired CA1189100A (en) | 1982-08-25 | 1982-08-25 | Method for measuring integrated weight of particulate feed material |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1189100A (en) |
-
1982
- 1982-08-25 CA CA000410085A patent/CA1189100A/en not_active Expired
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