CA1154622A - Control of bin steaming - Google Patents
Control of bin steamingInfo
- Publication number
- CA1154622A CA1154622A CA000384347A CA384347A CA1154622A CA 1154622 A CA1154622 A CA 1154622A CA 000384347 A CA000384347 A CA 000384347A CA 384347 A CA384347 A CA 384347A CA 1154622 A CA1154622 A CA 1154622A
- Authority
- CA
- Canada
- Prior art keywords
- chips
- bin
- vessel
- steam
- metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/02—Pretreatment of the raw materials by chemical or physical means
- D21B1/021—Pretreatment of the raw materials by chemical or physical means by chemical means
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Commercial Cooking Devices (AREA)
- Paper (AREA)
Abstract
CONTROL OF BIN STEAMING
ABSTRACT OF THE DISCLOSURE
An apparatus and method are provided for the control of the position of a condensing interface with respect to a steam inlet and an opposed material inlet. Wood chips or the like are introduced into the top of a vertical vessel while steam is introduced adjacent the bottom to flow upwardly toward the top.
An elongated strip of metal, having a length of at least about two feet and exhibiting a change in electrical resistance dependent upon temperature in the volume surrounding the strip, is mounted vertically within the vessel between the top and the bottom. The metal strip is operably connected by a circuit which produces an electrical control signal in response to resistivity changes in the metal strip greater than a predetermined amount to a valve for controlling the amount of steam supplied.
ABSTRACT OF THE DISCLOSURE
An apparatus and method are provided for the control of the position of a condensing interface with respect to a steam inlet and an opposed material inlet. Wood chips or the like are introduced into the top of a vertical vessel while steam is introduced adjacent the bottom to flow upwardly toward the top.
An elongated strip of metal, having a length of at least about two feet and exhibiting a change in electrical resistance dependent upon temperature in the volume surrounding the strip, is mounted vertically within the vessel between the top and the bottom. The metal strip is operably connected by a circuit which produces an electrical control signal in response to resistivity changes in the metal strip greater than a predetermined amount to a valve for controlling the amount of steam supplied.
Description
-6~
CONT~OL OF BIN STEAMING
BACKGROUND AND SUMMARY OF THE INVENTION
: .
In the treatment of cellulosic material in the production of paper pulp, it is highly desirable to effect steaming of the cellulosic material (hereinafter generally referred to as "chips") so that the chips can be easily penetrated by chemicals in subsequent treatment steps. If the chips are steamed a sufficient amount of time prior to the practice of any other production steps, the differences in chemical penetration later on are significantO
Because of the desirability of providing steaming, and considering the desirability of minimizing the amount of apparatus for pulp production, steaming directly in the chips bin has been practiced.
In chips bin steaming, such as shown in U.S.
Patent 4,124,440, the steam is introduced adjacent the bottom of the bin and flows upwardly toward the top of the bin countercurrent to the flow of chips downwardly in the bin. The chips act as insulators and as restrictions to the steam flow, and steam spreads out through the chips with a condensation interface being developed as a fairly sharp line across the bin. The chips below this interface have had their "appetite"
for steam satisfied, while the chips above the interface have not. The chips below the interface are held at temperature by the introduction of new steam until subsequently discharged from the bottom.
Chips bin steaming is usually very effective, however, the steam flow must be carefully regulated to avoid overloading of the odor control equipment at the top of the chips bin, and to avoid energy waste.
Overloading of the order control equipment can occur ;~ , 6;~
since once the chips steam demand is satisfied, any added steam will heat the bin walls. That provides a very tiny flow of heat relative to the large chip demand, but heat flow in the bin walls will cause the condensation interface to rise in the bin. Small increments of additional ste&m will cause the condensation interface to rise h;gher until it reaches the top of the bin, above the chips level in the bin. When this occurs, not all the steam entering the ~0 chips bin is condensed by the chips, and large volumes of steam will then overload the odor control equipment if the chips supply is suddenly cut off. For this reason, it is highly desirable to control the eondensation interface so that it is below the chips level but near the top of the bin.
According to the present invention, an apparatus and method are provided which can easily, inexpensively, and effectively determine the position of the condensation interface within the chips volume, and can automatically control the position of the interface in response to such a determination.
Conventional temperature sensors have been ineffective to provide this control since they merely determine the temperature at a point within the vessel.
According to the invention, on the other hand, the change in temperature in material within the vessel on either side of the interface volume (which may be guite extensive~ is sensed and used to effect temperature control.
Accordin~ to the present invention, means are provided for controlling the position of the interface volume with respect to the chips inlet by sensing the change in temperature of the chips within the vessel on either side and through the interface volume, and means are provided for controlling the s$eam supply in response to the temperature change sensing. W~ile the invention is described with respect to chips bin steaming, which is the preferred utilization thereof, it may have applicability in other material treatment processes.
The means for controlling the position of the interface volume and controlling the steam supplying means includes an elongated strip of metal exhibiting a change in electrical resistance dependent upon temperature in the volume surrounding it. ~he strip of metal typically will have length of at least about two feet, and preferably have a vertical operative length within the vessel of four to six feet. Means are provided for mounting the stip within the vessel so that the direction of elongation thereof is generally from the ehips inlet toward the chips outlet. Circuitry means are provided operatively connected to the metal strip for producing an electrical control signal in response to resistivity changes of the strip greater than a predetermined amount, and valve means are provided responsive to the electrical control signal for controlling the amount of steam passing into the vessel. The invention is particularly applicable to a chips bin with a vibrating discharge and steam introduction through components of the vibrating discharge, su~h as described in U.S. Patent 4,124,~40.
In practicing the invention for steaming of chips, the chips are fed into the chips bin from the top to establish a level in the bin just below the top. Steamed chips are withdrawn from the bottom of the chips bin9 steam being introduced into the bin adjacent the bottom to flow upwardly in the bin countercurrent to the flow of chips with a steam condensing interface being provided within the volume ~5~2 of chips in the bin. The elongated strip of metal, while not being useful in measuring temperature per se, will sense the temperature of chips within the bin on either side of and through the interface volume, and the interface volume is then controlled by controlling the ntroduction of steam into the bin in response to the temperature change sensing so that the steam remains below the level of chips in the bin.
It is the primary object of the present invention to provide for the control of the condensing interface during chips bin steaming in a simple and effective manner. This and other objects of the invention will become clear from an inspection of the detailed description of the invention, and from the appended claims.
BRI EF DESCRI PTION OF THE DRAWINGS
Figure l is a perspective view~ with portions cut away for clarity, of an exemplary chips bin utilizing the teachings according~ to the present invention;
Figure 2 is a side schernatic view illustrating the flow of materials in the apparatus of Figure l;
Figure 3 is a schematic view of a typical temperature sensor and circuitry nssociated therewith according to the present invention; and Figure 4 is a graphical representation of the effect of steaming on subsequent chemical penetration in the production of pulp from cellulosic chips material.
~5~
DETAILED DESCRIPTION OF THE DRAWINGS
As clearly illustrated in Figure 4, steaming has a significant effect upon the degree of penetration of chemicals during subsequent processing of cellulosic chips material. Figure 4 indicates the effect of steaming time and steam pressure on the degree of penetration after 10 minutes in water at 90C and 2 kp/cm~. The apparatus illustrated in Figure 1 is utilizable for effecting steaming. The apparatus illustrated in Figure 1 is a conventional chips bin with vibratory discharge.
The vibratory dischar~e includes a generally funnel-shaped top portion 10, and oscillatable bottom portion 11 including a flexible outlet 12 for the material, an activator cone 13, a plurality of arms 14 for supporting the activator cone 13 to the oscillatable bottom portion 11, and power means 16 for oscillating the bottom portion with respect to the top portion. Steam addition is accomplished through a number of openings 18 formed in the hollow arms 14, as more fully described in Patent 4,124,440, and underneath the top, pointed portion 19 of cone 13 which overhangs the bottom porticn 20 of the cone 13. Steam is supplied from source 22 through conduit 39 to a rectangular pipe-header arrangement 38, a flexible conduit 40 reaching from each leg of the header 38 to a respective arm 14 to introduce steam into the arm, with at least one of the arms also providing steam to the cone 13 for escape between the eone top 19 and bottom 20.
Associated with the vibrating delivery apparatus heretofore described is a conventional chips bin 50 which includes a chips inlet 51 ~e.g., air lock) formed into the top 52 thereof with a low pressure feeder exhaust conduit 53, and an odor control exhaust 55. The conduit 55 may ultimately lead to a condensor or a lime kiln in a pulp digesting system with which the bin 50 is assoeiated.
If steam is introduced into the bin S0 adjacent the bottom (e.g.~ through ports 18 and between cone portions 19 and 20) the flow is upwardly toward the top 52 of the bin 50, countercurrent to the flow of chips from inlet 51 to outlet 12. A
condensing interface volume C (see Figures 1 and 2) is provided in the chips volume beneath the chips level in the bin, the condensing interface C desirably being provided near the top Qf the bin 50, however.
According to the present inventionj the position of this interface volume C is controlled so that the steam remains below the level of chips in the bin and thus will not overload the odor control equipment connected to outlet 55 should the supply of chips be cut off.
Control of the interface volume is provided according to the present invention utili2ing controlling means which sense the change in temperature in the chips within the bin 50 on either side and through the interfaee volume C, and means for controlling the valve 59 which supplies steam from source 22 to the steam delivery apparatus 3$ 7 etc.~ in response to the temperature change sensing. The controlling means comprises a temperature probe casing 60 which includes an elongated strip of metal 61 disposed therein, the metal exhibiting a change in electrical resistance dependent upon temperature in the volume surrounding it. The metal of which the strip 61 is formed may be any metal wherein the resistance-temperature relationship is highly stable, the specific resistance is within limits that permit ~5~
fabrication of practically sized elements, resistance changes where non-temperature effects are minimal, has a relatively large change in resistance with temperature, and does not undergo any change of phase or state within the temperatures typically encountered in use. Typical useful metals include platinum, nickel and copper. The strip of metal 61 has an operative length L within the vessel 50 of at least about two feet, and preferably extends the vertical operative length of about four to six feet in the vessel. A bushing 62 (see Figure 1) is provided for the temperature probe 60, metal strip 61, and metal strip 61 is connected by wires 63 to circuitry means 64.
The circuitry means 64 may be any conYentional circuitry means for producing an electrical control signal in response to resistivity changes in the strip of metal 61 greater than a predetermined amount. The circuitry means 64 are operatively connected by line 66 to valve means 59.
The valve means 59 control the amount of steam flowing into conduit 39 in response to the electrical control signal from the circuitry means 64.
As illustrated most clearly in Figures 1 and
CONT~OL OF BIN STEAMING
BACKGROUND AND SUMMARY OF THE INVENTION
: .
In the treatment of cellulosic material in the production of paper pulp, it is highly desirable to effect steaming of the cellulosic material (hereinafter generally referred to as "chips") so that the chips can be easily penetrated by chemicals in subsequent treatment steps. If the chips are steamed a sufficient amount of time prior to the practice of any other production steps, the differences in chemical penetration later on are significantO
Because of the desirability of providing steaming, and considering the desirability of minimizing the amount of apparatus for pulp production, steaming directly in the chips bin has been practiced.
In chips bin steaming, such as shown in U.S.
Patent 4,124,440, the steam is introduced adjacent the bottom of the bin and flows upwardly toward the top of the bin countercurrent to the flow of chips downwardly in the bin. The chips act as insulators and as restrictions to the steam flow, and steam spreads out through the chips with a condensation interface being developed as a fairly sharp line across the bin. The chips below this interface have had their "appetite"
for steam satisfied, while the chips above the interface have not. The chips below the interface are held at temperature by the introduction of new steam until subsequently discharged from the bottom.
Chips bin steaming is usually very effective, however, the steam flow must be carefully regulated to avoid overloading of the odor control equipment at the top of the chips bin, and to avoid energy waste.
Overloading of the order control equipment can occur ;~ , 6;~
since once the chips steam demand is satisfied, any added steam will heat the bin walls. That provides a very tiny flow of heat relative to the large chip demand, but heat flow in the bin walls will cause the condensation interface to rise in the bin. Small increments of additional ste&m will cause the condensation interface to rise h;gher until it reaches the top of the bin, above the chips level in the bin. When this occurs, not all the steam entering the ~0 chips bin is condensed by the chips, and large volumes of steam will then overload the odor control equipment if the chips supply is suddenly cut off. For this reason, it is highly desirable to control the eondensation interface so that it is below the chips level but near the top of the bin.
According to the present invention, an apparatus and method are provided which can easily, inexpensively, and effectively determine the position of the condensation interface within the chips volume, and can automatically control the position of the interface in response to such a determination.
Conventional temperature sensors have been ineffective to provide this control since they merely determine the temperature at a point within the vessel.
According to the invention, on the other hand, the change in temperature in material within the vessel on either side of the interface volume (which may be guite extensive~ is sensed and used to effect temperature control.
Accordin~ to the present invention, means are provided for controlling the position of the interface volume with respect to the chips inlet by sensing the change in temperature of the chips within the vessel on either side and through the interface volume, and means are provided for controlling the s$eam supply in response to the temperature change sensing. W~ile the invention is described with respect to chips bin steaming, which is the preferred utilization thereof, it may have applicability in other material treatment processes.
The means for controlling the position of the interface volume and controlling the steam supplying means includes an elongated strip of metal exhibiting a change in electrical resistance dependent upon temperature in the volume surrounding it. ~he strip of metal typically will have length of at least about two feet, and preferably have a vertical operative length within the vessel of four to six feet. Means are provided for mounting the stip within the vessel so that the direction of elongation thereof is generally from the ehips inlet toward the chips outlet. Circuitry means are provided operatively connected to the metal strip for producing an electrical control signal in response to resistivity changes of the strip greater than a predetermined amount, and valve means are provided responsive to the electrical control signal for controlling the amount of steam passing into the vessel. The invention is particularly applicable to a chips bin with a vibrating discharge and steam introduction through components of the vibrating discharge, su~h as described in U.S. Patent 4,124,~40.
In practicing the invention for steaming of chips, the chips are fed into the chips bin from the top to establish a level in the bin just below the top. Steamed chips are withdrawn from the bottom of the chips bin9 steam being introduced into the bin adjacent the bottom to flow upwardly in the bin countercurrent to the flow of chips with a steam condensing interface being provided within the volume ~5~2 of chips in the bin. The elongated strip of metal, while not being useful in measuring temperature per se, will sense the temperature of chips within the bin on either side of and through the interface volume, and the interface volume is then controlled by controlling the ntroduction of steam into the bin in response to the temperature change sensing so that the steam remains below the level of chips in the bin.
It is the primary object of the present invention to provide for the control of the condensing interface during chips bin steaming in a simple and effective manner. This and other objects of the invention will become clear from an inspection of the detailed description of the invention, and from the appended claims.
BRI EF DESCRI PTION OF THE DRAWINGS
Figure l is a perspective view~ with portions cut away for clarity, of an exemplary chips bin utilizing the teachings according~ to the present invention;
Figure 2 is a side schernatic view illustrating the flow of materials in the apparatus of Figure l;
Figure 3 is a schematic view of a typical temperature sensor and circuitry nssociated therewith according to the present invention; and Figure 4 is a graphical representation of the effect of steaming on subsequent chemical penetration in the production of pulp from cellulosic chips material.
~5~
DETAILED DESCRIPTION OF THE DRAWINGS
As clearly illustrated in Figure 4, steaming has a significant effect upon the degree of penetration of chemicals during subsequent processing of cellulosic chips material. Figure 4 indicates the effect of steaming time and steam pressure on the degree of penetration after 10 minutes in water at 90C and 2 kp/cm~. The apparatus illustrated in Figure 1 is utilizable for effecting steaming. The apparatus illustrated in Figure 1 is a conventional chips bin with vibratory discharge.
The vibratory dischar~e includes a generally funnel-shaped top portion 10, and oscillatable bottom portion 11 including a flexible outlet 12 for the material, an activator cone 13, a plurality of arms 14 for supporting the activator cone 13 to the oscillatable bottom portion 11, and power means 16 for oscillating the bottom portion with respect to the top portion. Steam addition is accomplished through a number of openings 18 formed in the hollow arms 14, as more fully described in Patent 4,124,440, and underneath the top, pointed portion 19 of cone 13 which overhangs the bottom porticn 20 of the cone 13. Steam is supplied from source 22 through conduit 39 to a rectangular pipe-header arrangement 38, a flexible conduit 40 reaching from each leg of the header 38 to a respective arm 14 to introduce steam into the arm, with at least one of the arms also providing steam to the cone 13 for escape between the eone top 19 and bottom 20.
Associated with the vibrating delivery apparatus heretofore described is a conventional chips bin 50 which includes a chips inlet 51 ~e.g., air lock) formed into the top 52 thereof with a low pressure feeder exhaust conduit 53, and an odor control exhaust 55. The conduit 55 may ultimately lead to a condensor or a lime kiln in a pulp digesting system with which the bin 50 is assoeiated.
If steam is introduced into the bin S0 adjacent the bottom (e.g.~ through ports 18 and between cone portions 19 and 20) the flow is upwardly toward the top 52 of the bin 50, countercurrent to the flow of chips from inlet 51 to outlet 12. A
condensing interface volume C (see Figures 1 and 2) is provided in the chips volume beneath the chips level in the bin, the condensing interface C desirably being provided near the top Qf the bin 50, however.
According to the present inventionj the position of this interface volume C is controlled so that the steam remains below the level of chips in the bin and thus will not overload the odor control equipment connected to outlet 55 should the supply of chips be cut off.
Control of the interface volume is provided according to the present invention utili2ing controlling means which sense the change in temperature in the chips within the bin 50 on either side and through the interfaee volume C, and means for controlling the valve 59 which supplies steam from source 22 to the steam delivery apparatus 3$ 7 etc.~ in response to the temperature change sensing. The controlling means comprises a temperature probe casing 60 which includes an elongated strip of metal 61 disposed therein, the metal exhibiting a change in electrical resistance dependent upon temperature in the volume surrounding it. The metal of which the strip 61 is formed may be any metal wherein the resistance-temperature relationship is highly stable, the specific resistance is within limits that permit ~5~
fabrication of practically sized elements, resistance changes where non-temperature effects are minimal, has a relatively large change in resistance with temperature, and does not undergo any change of phase or state within the temperatures typically encountered in use. Typical useful metals include platinum, nickel and copper. The strip of metal 61 has an operative length L within the vessel 50 of at least about two feet, and preferably extends the vertical operative length of about four to six feet in the vessel. A bushing 62 (see Figure 1) is provided for the temperature probe 60, metal strip 61, and metal strip 61 is connected by wires 63 to circuitry means 64.
The circuitry means 64 may be any conYentional circuitry means for producing an electrical control signal in response to resistivity changes in the strip of metal 61 greater than a predetermined amount. The circuitry means 64 are operatively connected by line 66 to valve means 59.
The valve means 59 control the amount of steam flowing into conduit 39 in response to the electrical control signal from the circuitry means 64.
As illustrated most clearly in Figures 1 and
2, the probe 60 is mounted within the bin 50 so that it extends substantially vertically in the bin 50 extending through the preferred condensation interface volume C, below the level of chips in the bin 50, which chips level is controlled by conventional level control means 68 (illustrated schematically in Figure 2).
In utilizing the described apparatus in a method of chips bin steaming, chips are fed into the bin 50 through feeder 51 to establish a chips level in the bin just below the bin top (see Figure 2). Steam 6~
is introduced into the bin adjacent the bottom, from source 22 through valve 59, conduit 39, headers 38, and arm openings 18, etc., to flow upwardly in the bin countercurrent to the flow of chips in the bin with the steam condensing interface Yolume C being provided within the volume of chips in the bin. Steamed chips are withdrawn from the bottom of the chips bin through outlet 12. The position of the interface volume C is controlled with respect to the top level of chips within the bin by sensing the temperature of the chips within the bin on either side of and through the interface volume, and controlling the introduction of steam (by controlling valve 59) in response to the temperature change sensing so that the steam remains below the level of chips in the bin. The temperature sensing is accomplished by the elongated metal strip 61 which undergoes a change in electrical resistance dependent upon the temperature in the surrounding volume, which strip is disposed so that it extends vertically in the bin at least the vertical length of the steam condensing interface C; producing a control signal by circuitry means 64 in response to resistivity changes in the strip of metal 61; and controlling the valve means 59 with the control signal produced from the circuitry means ~4.
It will thus be seen that according to the present invention a simple yet effective apparatus and method have been provided for, in general, the treatment of material in a vessel with a heating fluid; and in particular, the steaming of chips in a chips bin controlling the position of the condensation interface therein. While the invention has herein been shown and described in what is presently conceived to be the most practic&l and preferred embodiment thereof, it will be apparent to those of ~5~2~
ordinary skill in the art that many modifications may be made thereof within the scope of the invention, which scope is to be accorded the broadest interpretation of the appended claims so as to emcompass all equivalent apparatus and methodsO
In utilizing the described apparatus in a method of chips bin steaming, chips are fed into the bin 50 through feeder 51 to establish a chips level in the bin just below the bin top (see Figure 2). Steam 6~
is introduced into the bin adjacent the bottom, from source 22 through valve 59, conduit 39, headers 38, and arm openings 18, etc., to flow upwardly in the bin countercurrent to the flow of chips in the bin with the steam condensing interface Yolume C being provided within the volume of chips in the bin. Steamed chips are withdrawn from the bottom of the chips bin through outlet 12. The position of the interface volume C is controlled with respect to the top level of chips within the bin by sensing the temperature of the chips within the bin on either side of and through the interface volume, and controlling the introduction of steam (by controlling valve 59) in response to the temperature change sensing so that the steam remains below the level of chips in the bin. The temperature sensing is accomplished by the elongated metal strip 61 which undergoes a change in electrical resistance dependent upon the temperature in the surrounding volume, which strip is disposed so that it extends vertically in the bin at least the vertical length of the steam condensing interface C; producing a control signal by circuitry means 64 in response to resistivity changes in the strip of metal 61; and controlling the valve means 59 with the control signal produced from the circuitry means ~4.
It will thus be seen that according to the present invention a simple yet effective apparatus and method have been provided for, in general, the treatment of material in a vessel with a heating fluid; and in particular, the steaming of chips in a chips bin controlling the position of the condensation interface therein. While the invention has herein been shown and described in what is presently conceived to be the most practic&l and preferred embodiment thereof, it will be apparent to those of ~5~2~
ordinary skill in the art that many modifications may be made thereof within the scope of the invention, which scope is to be accorded the broadest interpretation of the appended claims so as to emcompass all equivalent apparatus and methodsO
Claims (12)
1. In a vessel having an inlet for material at one end thereof, an outlet for material at another end thereof, and means for supplying heating fluid flowing substantially countercurrent to the flow of material from the inlet to the outlet to provide an interface volume between the material and heating fluid, the improvement comprising:
means for controlling the position of the interface volume with respect to said material inlet by sensing the change in temperature in material within said vessel on either side of and through the interface volume; and means for controlling said means for supplying heating fluid in response to said temperature change sensing.
means for controlling the position of the interface volume with respect to said material inlet by sensing the change in temperature in material within said vessel on either side of and through the interface volume; and means for controlling said means for supplying heating fluid in response to said temperature change sensing.
2. In a vessel as recited in claim 1 wherein said means for controlling the position of the interface volume and controlling said heating fluid supplying means comprises:
an elongated strip of metal having as an inherent property changing in electrical resistance dependent upon temperature;
means for mounting said strip of metal within said vessel so that the direction of elongation thereof is generally from said material inlet to said material outlet;
circuitry means operatively connected to said strip of metal for producing an electrical control signal in response to resistivity changes of said strip of metal greater than a predetermined amount;
and valve means responsive to said electrical control signal for controlling the amount of heating fluid passing through said supplying means to said vessel.
an elongated strip of metal having as an inherent property changing in electrical resistance dependent upon temperature;
means for mounting said strip of metal within said vessel so that the direction of elongation thereof is generally from said material inlet to said material outlet;
circuitry means operatively connected to said strip of metal for producing an electrical control signal in response to resistivity changes of said strip of metal greater than a predetermined amount;
and valve means responsive to said electrical control signal for controlling the amount of heating fluid passing through said supplying means to said vessel.
3. In a vessel as recited in claim 2 wherein said vessel is a chips bin mounted with said material inlet vertically above said material outlet; wherein said means for supplying heating fluid comprises means for supplying steam to said vessel from adjacent said material outlet flowing toward said material inlet;
wherein the interface volume comprises a steam condensing interface located between the material inlet and outlet; and wherein said means for mounting said strip of metal mounts said strip of metal within said vessel extending substantially vertically and at a position between said material inlet and outlet, below the level of chips in the bin.
wherein the interface volume comprises a steam condensing interface located between the material inlet and outlet; and wherein said means for mounting said strip of metal mounts said strip of metal within said vessel extending substantially vertically and at a position between said material inlet and outlet, below the level of chips in the bin.
4. In a vessel as recited in claim 3 wherein said elongated strip of metal extends a vertical operative length of at least two feet within said vessel.
5. In a vessel as recited in claim 4 wherein said elongated strip of metal extends a vertical operative length of about four to six feet.
6. In a vessel as recited in claims 3 or 5 wherein said chips bin comprises a vessel including a generally funnel-shaped stationary portion, an oscillatable bottom portion including a flexible chips outlet, an activator cone connected to said bottom portion by a plurality of arms extending outwardly from said activator cone with said activator cone disposed above said chips outlet and said activator cone and said chips outlet being generally concentric, and power means for oscillating said bottom portion with respect to said top portion; and wherein said means for supplying steam to said chips bin comprises a plurality of steam ports formed in each of said support arms of said activator cone and means for supplying steam to the arms for passage through said ports into the bin.
7. A method of chips bin steaming of chips, utilizing a vertically oriented chips bin having a top and bottom, comprising the steps of:
feeding chips into the chips bin from the top thereof to establish a chips level in the bin just below the bin top;
introducing steam to effect steaming of chips in the bin adjacent the bottom of the bin to flow upwardly in the bin countercurrent to the flow of chips in the bin, with a steam condensing interface being provided within the volume of chips within the bin;
withdrawing steamed chips from the bottom of the chips bin; and controlling the position of the interface volume with respect to the top level of chips within the bin by: sensing the temperature of chips within the chips bin on either side of and through the interface volume; and controlling the introduction of steam into the bin in response to the temperature change sensing so that the steam remains below the level of chips in the bin.
feeding chips into the chips bin from the top thereof to establish a chips level in the bin just below the bin top;
introducing steam to effect steaming of chips in the bin adjacent the bottom of the bin to flow upwardly in the bin countercurrent to the flow of chips in the bin, with a steam condensing interface being provided within the volume of chips within the bin;
withdrawing steamed chips from the bottom of the chips bin; and controlling the position of the interface volume with respect to the top level of chips within the bin by: sensing the temperature of chips within the chips bin on either side of and through the interface volume; and controlling the introduction of steam into the bin in response to the temperature change sensing so that the steam remains below the level of chips in the bin.
8. A method as recited in claim 7 wherein said temperature sensing step is accomplished by disposing an elongated strip of metal so that it extends vertically in the chips bin at least the vertical length of the steam condensing interface;
producing a control signal in response to resistivity changes in the strip of metal greater than a predetermined amount; and controlling the introduction of steam into the bin in response to the electrical control signal.
producing a control signal in response to resistivity changes in the strip of metal greater than a predetermined amount; and controlling the introduction of steam into the bin in response to the electrical control signal.
9. A method as recited in claims 7 or 8 wherein said step of withdrawing steam chips from the bottom of the chips bin is accomplished by providing a funnel-shape to the chips bin including a stationary portion, and an oscillatable bottom portion within an activator cone connected to the bottom portion by a plurality of arms, and oscillating the bottom portion with respect to said stationary portion; and wherein said steam introduction step is accomplished by introducing steam into the activator cone support arms to flow through openings in the arms and steam the chips.
10. Apparatus comprising a generally vertically oriented vessel having an inlet located at the top thereof and an outlet located at the bottom thereof;
means for introducing steam adjacent the bottom of the vessel to flow upwardly therein toward the top of the vessel;
an elongated strip of metal, having a length of at least about two feet, the metal exhibiting a change in electrical resistance dependent upon temperature in the volume surrounding the strip of metal;
means for mounting the strip of metal substantially vertically within the vessel between the top and bottom thereof, so that vertical length of the strip of metal within the vessel is at least about two feet;
circuitry means operatively connected to said strip of metal for producing an electrical control signal in response to resistivity changes of the strip of metal greater than a predetermined amount; and valve means for controlling the amount of steam applied to the interior of the vessel through the steam-introducing means in response to said electrical control signal.
means for introducing steam adjacent the bottom of the vessel to flow upwardly therein toward the top of the vessel;
an elongated strip of metal, having a length of at least about two feet, the metal exhibiting a change in electrical resistance dependent upon temperature in the volume surrounding the strip of metal;
means for mounting the strip of metal substantially vertically within the vessel between the top and bottom thereof, so that vertical length of the strip of metal within the vessel is at least about two feet;
circuitry means operatively connected to said strip of metal for producing an electrical control signal in response to resistivity changes of the strip of metal greater than a predetermined amount; and valve means for controlling the amount of steam applied to the interior of the vessel through the steam-introducing means in response to said electrical control signal.
11. Apparatus as recited in claim 10 wherein said elongated strip of metal extends a vertical length of about four to six feet within said vessel.
12. Apparatus as recited in claim 11 wherein said vessel bottom is generally funnel-shaped including a stationary portion and an oscillatable portion, an activator cone connected to said bottom portion by a plurality of arms extending outwardly therefrom, and power means for oscillating the oscillatable portion with respect to the stationary portion; and wherein said means for introducing steam adjacent the bottom of the vessel comprises means for introducing steam into said arms for supporting said activator cone, and through openings defined in said arms into the interior volume of the vessel.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US18985280A | 1980-09-22 | 1980-09-22 | |
| US189,852 | 1980-09-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1154622A true CA1154622A (en) | 1983-10-04 |
Family
ID=22699025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000384347A Expired CA1154622A (en) | 1980-09-22 | 1981-08-21 | Control of bin steaming |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1154622A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4867845A (en) * | 1988-06-15 | 1989-09-19 | Kamyr, Inc. | Vertical steaming vessel |
| US5167769A (en) * | 1990-11-14 | 1992-12-01 | Pulp And Paper Research Institute Of Canada | Particle level sensor |
| US5169498A (en) * | 1991-09-03 | 1992-12-08 | Kamyr, Inc. | Atmospheric pre-steaming chip bin vacuum and pressure relief device |
| US5476572A (en) * | 1994-06-16 | 1995-12-19 | Kamyr, Inc. | Chip feeding for a continuous digester |
| US5500083A (en) * | 1994-02-01 | 1996-03-19 | Kamyr, Inc. | Method of feeding cellulosic material to a digester using a chip bin with one dimensional convergence and side relief |
| WO1996010674A1 (en) * | 1994-10-04 | 1996-04-11 | Kamyr, Inc. | Reducing gaseous emissions from a chip bin |
| US5622598A (en) * | 1995-04-25 | 1997-04-22 | Ahlstrom Machinery Inc. | Chip pumping to a digester |
| US5635025A (en) * | 1994-12-05 | 1997-06-03 | Ahlstrom Machinery Inc. | Digester system containing a single vessel serving as all of a chip bin, steaming vessel, and chip chute |
| US5674360A (en) * | 1995-06-01 | 1997-10-07 | International Paper Company | Method and apparatus for steam packing/presteaming a batch digester |
| US5766418A (en) * | 1996-09-13 | 1998-06-16 | Ahlstrom Machinery Inc. | Handling fibrous material used to produce cellulose pulp |
| WO2003106765A1 (en) | 2001-12-17 | 2003-12-24 | Kvaerner Pulping Ab | Method and arrangement for impregnating chips |
-
1981
- 1981-08-21 CA CA000384347A patent/CA1154622A/en not_active Expired
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4867845A (en) * | 1988-06-15 | 1989-09-19 | Kamyr, Inc. | Vertical steaming vessel |
| US5167769A (en) * | 1990-11-14 | 1992-12-01 | Pulp And Paper Research Institute Of Canada | Particle level sensor |
| US5169498A (en) * | 1991-09-03 | 1992-12-08 | Kamyr, Inc. | Atmospheric pre-steaming chip bin vacuum and pressure relief device |
| US5500083A (en) * | 1994-02-01 | 1996-03-19 | Kamyr, Inc. | Method of feeding cellulosic material to a digester using a chip bin with one dimensional convergence and side relief |
| US5628873A (en) * | 1994-02-01 | 1997-05-13 | Ahlstrom Machinery Inc. | Chip bin assembly including a hollow transition with one dimensional convergence and side relief |
| US5476572A (en) * | 1994-06-16 | 1995-12-19 | Kamyr, Inc. | Chip feeding for a continuous digester |
| US5547546A (en) * | 1994-10-04 | 1996-08-20 | Ahlstrom Machinery Inc. | Chip bin with steaming control and a gas vent containing a vacuum and pressure relief device |
| WO1996010674A1 (en) * | 1994-10-04 | 1996-04-11 | Kamyr, Inc. | Reducing gaseous emissions from a chip bin |
| US5635025A (en) * | 1994-12-05 | 1997-06-03 | Ahlstrom Machinery Inc. | Digester system containing a single vessel serving as all of a chip bin, steaming vessel, and chip chute |
| US5622598A (en) * | 1995-04-25 | 1997-04-22 | Ahlstrom Machinery Inc. | Chip pumping to a digester |
| US5674360A (en) * | 1995-06-01 | 1997-10-07 | International Paper Company | Method and apparatus for steam packing/presteaming a batch digester |
| US5766418A (en) * | 1996-09-13 | 1998-06-16 | Ahlstrom Machinery Inc. | Handling fibrous material used to produce cellulose pulp |
| WO2003106765A1 (en) | 2001-12-17 | 2003-12-24 | Kvaerner Pulping Ab | Method and arrangement for impregnating chips |
| US7381302B2 (en) | 2001-12-17 | 2008-06-03 | Metso Fiber Karlstad Ab | Method and arrangement for impregnating chips |
| US7615134B2 (en) | 2001-12-17 | 2009-11-10 | Metso Fiber Karlstad Ab | Method and arrangement of impregnating chips |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |