CN102449233A - System and method for the regulation of a continuous vapour phase digester - Google Patents
System and method for the regulation of a continuous vapour phase digester Download PDFInfo
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- CN102449233A CN102449233A CN2010800243342A CN201080024334A CN102449233A CN 102449233 A CN102449233 A CN 102449233A CN 2010800243342 A CN2010800243342 A CN 2010800243342A CN 201080024334 A CN201080024334 A CN 201080024334A CN 102449233 A CN102449233 A CN 102449233A
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- 238000000034 method Methods 0.000 title claims abstract description 99
- 230000008569 process Effects 0.000 claims abstract description 83
- 230000001105 regulatory effect Effects 0.000 claims abstract description 28
- 238000009835 boiling Methods 0.000 claims description 191
- 239000007788 liquid Substances 0.000 claims description 115
- 239000002023 wood Substances 0.000 claims description 40
- 239000000463 material Substances 0.000 claims description 21
- 229920001131 Pulp (paper) Polymers 0.000 claims description 15
- 238000005516 engineering process Methods 0.000 claims description 13
- 230000011218 segmentation Effects 0.000 claims description 9
- 230000003068 static effect Effects 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 6
- 230000003993 interaction Effects 0.000 claims description 6
- 230000001143 conditioned effect Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 abstract description 6
- 238000010411 cooking Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 42
- 230000004941 influx Effects 0.000 description 15
- 230000004048 modification Effects 0.000 description 7
- 238000012986 modification Methods 0.000 description 7
- 238000011084 recovery Methods 0.000 description 7
- 239000003085 diluting agent Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000003750 conditioning effect Effects 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000009401 outcrossing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C7/00—Digesters
- D21C7/12—Devices for regulating or controlling
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C3/00—Pulping cellulose-containing materials
- D21C3/22—Other features of pulping processes
- D21C3/24—Continuous processes
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Abstract
The invention concerns a system and a method for the regulation of a continuous vapour phase digester (50). The relevant process inflows (CH, ST, WL, DL) are regulated with a process regulator (PC) depending on current process outflows (LIQRET, CHOUT) in order to establish a gas phase (STP) above a level (LIQLEV) of cooking fluid in the digester and a level of chips (CHLEV) in the digester that lies above the level of fluid. The process regulator has a first set of sensors (40, 41, 43) in order to control a first set of regulators (10, 11, 12, 13) in the input with respect to a first set of target values, and that [sic, syntax] the system comprises a load controller that is independent of the process regulator, which load controller has a second set of sensors (42) in order to control a second set of regulators (20, 21, 22, 23) in the input with respect to a second set of threshold values. The load controller closes at least one of the relevant inflows when these threshold values are exceeded. Alternatively, the load controller can open an otherwise closed line in order to reduce the volume of fluid in the digester.
Description
Technical field
The present invention relates to be used to regulate the system and method for the continuous gas phase boiling vessel of production of cellulose paper pulp.
Background technology
Have the existing system through the continuous gas phase boiling vessel of the outlet of the paper pulp of boiling that is used for that segments the inlet of cellulosic material (finely divided cellulose material) and be positioned at the bottom of being used to that is arranged in the top, the gas phase boiling vessel is always confirmed size based on the standard that boiling vessel is full of liquid.Since Metso Fiber Karlstad AB (then with Kamyr AB name) installs production capacity in nineteen fifty at Fengerfors is that first boiling vessel of 50 air-dry metric ton/24 hours (ADMT/24h) begins; At the lndah of Indonesia Kiat, Jambi and Lontar Papyrus production capacity was installed up to 2007 and is about 4; Since 000 air-dry tonne/24 hours the gas phase boiling vessel; The technology of this definite size has become criterion, is used to be called as the boiling vessel of gas type " kamyr digester ".
When setting up continued operation, this means above-mentioned boiling vessel over dimensioning, because during normal running, the liquid water prosposition of foundation is in distance quite far away under the top of boiling vessel.In large-scale boiling vessel workshop, when operation when having set up, liquid is positioned under the top of boiling vessel approximately 10m place, and this clings to static pressure corresponding to reducing by 1 on the boiling vessel housing.The size of boiling vessel is also decided with respect to the nominal pressure desired value in the gas phase, and this can be the predetermined target value of interval 3-8 crust.For pressure among the 100m, gas phase is in the boiling vessel of 5 crust, design pressure will be to be filled with pressure sum in static pressure and the gas phase of boiling vessel of liquid, promptly 15 cling to highly.
Therefore, mainly,, confirm the size of boiling vessel housing secondly based on the associated temperature of the heat load of confirming digester vessel based on the related objective value of pressure in container that is filled with liquid and the gas phase.Can consider also whether boiling vessel is installed in the such fact of geographical zone that is subject to earthquake.All these confirm that the standard of size all makes the thickness of material to increase, and not only satisfy confirming the main standard of size, but also satisfy minor criteria, and this further increases the consumption of material and cost.If can influence the main standard of confirming size for instance, so can manufactured materials consumption and the obvious complete boiling vessel that reduces of cost of investment consumption.
Summary of the invention
Goal of the invention
First purpose of the present invention is to make the continuous steamer that is used for predetermined operational parameters, and wherein the cost of boiling vessel can reduce the amount near 10%, still satisfies the standard of confirming size simultaneously.
Second purpose is to reduce the consumption of sheet metal, so that realize can not making the economy manufacturing of the excessive boiling vessel of raw-material available supply burden.Between many decades, the burden of reduction natural resources has become even is even more important in the past.This just requires to satisfy to particular batch the particular demands of economical apparatus.
The 3rd purpose is during setting up stable operation, guarantees that boiling vessel is in the nargin that departs under the extreme operating condition of normal operating condition.
The invention summary
The present invention relates to a kind ofly in order to regulating the system of continuous gas phase boiling vessel, this continuous gas phase boiling vessel has the outlet through the paper pulp of boiling that is used for segmenting the inlet of cellulosic material and be positioned at the bottom of being used to that is positioned at the top.Related process flows into (amount), and for example the inflow (amount) of wood chip and related boiling liquid (cooking fluid) is regulated according to the outflow (amount) (the for example outflow of boiling liquid (amount)) of current technology with through the outflow (amount) of the paper pulp of boiling by process modulator.Carry out this adjusting in order that at least during setting up continued operation; Generate gas phase (space) on the level of the boiling liquid in boiling vessel and on the level on the level that is positioned at liquid of the wood chip in boiling vessel; The level of wood chip can be conditioned, so that the power of the directed downwards on the column of chips in the adjustment boiling vessel.
Process modulator has first group of sensor; First group of sensor is connected to process modulator, and is used for controlling first group of adjuster, and first group of adjuster is positioned at the input of segmentation cellulosic material and boiling liquid to boiling vessel.
According to the present invention, system comprises the load governor that is independent of process modulator, and load governor has second group of sensor; Second group of sensor is connected to load governor, and is used for controlling second group of adjuster, and second group of adjuster is positioned at the input of segmentation cellulosic material and boiling liquid to boiling vessel.
Process modulator is regulated the pressure in the gas phase (space), the level and the liquid water prosposition of wood chip with respect to first group of desired value in the process modulator; And load governor is monitored the pressure in the gas phase (space), the level and the liquid water prosposition of wood chip with respect to second group of threshold value in the load governor; Compare with the control that process modulator is carried out with respect to current target value, the interaction partners boiling vessel of the level of the pressure in the gas phase (space), the level of wood chip and liquid provides higher load value.When surpassing these threshold values, the load governor utilization is connected to second group of adjuster of load governor and closes at least one relevant inflow.
Preferably by forming normally setting up operating period flow valve open in usual (open flow valve), this valve cuts out when overloading the threshold value of controller the second group of adjuster that is connected to load governor.These flow valves are independent of the adjusting that process modulator applies the influx and the discharge of boiling vessel.
The second group of adjuster that is connected to load governor is made up of the current controller that helps stream machine (flow-promoting machine) alternatively, helps the stream machine to be used to transport the inflow or the effluent of boiling vessel.These current controllers interrupt helping the operational power of stream machine when overloading the threshold value of controller.These current controllers also are independent of the adjusting that process modulator applies the influx and the discharge of boiling vessel.
Relate to adjusting according to the method for the invention to continuous vapour phase digester, this continuous vapour phase digester have be positioned at the top be used to segment the inlet of cellulosic material and be positioned at the bottom be used for outlet through the paper pulp of boiling.The related process influx, the influx of wood chip and related boiling liquid is for example regulated according to the discharge of current technology (for example the discharge of boiling liquid and through the discharge of the paper pulp of boiling) by process modulator.Carry out this adjusting in order that at least during setting up continued operation, on the level of the boiling liquid in boiling vessel and being positioned on the level on the liquid water prosposition of the wood chip in boiling vessel generate gas phase.Can regulate the level of wood chip, so that the power of directed downwards on the column of chips in the adjustment boiling vessel.
According to this method, control the input of segmentation cellulosic material and boiling liquid with respect to a plurality of first technological parameters of the first special process adjuster, monitor the load on the container of boiling vessel through the load governor that is independent of process modulator simultaneously.Process modulator is regulated the pressure in the gas phase, the level and the liquid water prosposition of wood chip with respect to first group of desired value in the process modulator; And load governor is monitored the pressure in the gas phase, the level and the liquid water prosposition of wood chip with respect to second group of threshold value in the load governor.Compare with the control that process modulator is carried out with respect to current target value, the interaction partners boiling vessel of the level of the pressure in the gas phase, the level of wood chip and liquid provides higher load value; And when surpassing these threshold values, load governor is independent of process modulator and is applied to the adjusting in this inflow, closes at least one inflow to boiling vessel.
Can be by the form of process modulator and load governor; Utilize this dividing mode to mark off two independently systems; Each system has independently sensor and adjuster; Coming the operation of digester workshop with respect to the current target value in the process modulator, and have the independently security system that is used for load governor, this allows to adopt possible high total pressure in boiling vessel to load to confirm the size of complete boiling vessel.
In a preferred embodiment of this method; Process controller is with respect to the first desired value control process of liquid water prosposition and boiling vessel top pressure, and the gross pressure load that wherein is derived from the digester vessel of current technological parameter is provided by the static height of liquid water prosposition and pressure sum in the gas phase of boiling vessel top; And load governor has at least one predetermined threshold of gross pressure load, and at least one predetermined threshold of gross pressure load is limited at least one the pre-determined constant threshold value of the level of liquid in the boiling vessel and the fixing predetermined threshold of the pressure in the gas phase.In this modification, the threshold value of the load of the bottom of boiling vessel can be corresponding under the pressure condition in the gas phase of 5 crust, the load of the liquid water prosposition of 10m under the top of boiling vessel; And if surpassed any in these fixed thresholds, load governor will start.
In second preferred embodiment of this method; Process modulator is come control process with respect to first desired value of the pressure at liquid water prosposition and boiling vessel top, and the gross pressure load that wherein is derived from the digester vessel of current technological parameter is provided by the static height of liquid water prosposition and pressure sum in the gas phase of boiling vessel top; And load governor has at least one threshold value of gross pressure load, and at least one threshold value of gross pressure load is limited, provided by the load of liquid water prosposition in the boiling vessel and the pressure sum in the gas phase at least one pre-determined constant threshold value of the load of digester bottom.In this modification; The threshold value of the load of the bottom of boiling vessel can be corresponding under the pressure condition in the gas phase of 5 crust; If the load of the liquid water prosposition of 10m under the boiling vessel top is but the reduction of the pressure in the gas phase, the then corresponding degree of the threshold value of liquid water prosposition rising.
Of the present invention to (the safe water prosposition of liquid 11m place under the boiling vessel top wherein in the application scheme of continuous gas phase boiling vessel; Total building height is 72.5m; Base diameter is greater than 12m; And has predetermined operating parameters with respect to top pressure, capacity, temperature); Can totle drilling cost (adopt in April, 2008 material price) be reduced to 21.2 hundred ten thousand SEKs from about 23.5 hundred ten thousand SEKs (SEK), therefore save 2.3 hundred ten thousand SEKs in other words, save about 10% accordingly.
Description of drawings
Fig. 1 illustrates on the principle according to the system that is used to regulate continuous steamer of the present invention;
Fig. 2 illustrates according to load governor replaceability of the present invention or complementarity; And
Fig. 3 illustrates the modification of Fig. 2.
The specific embodiment
To use the notion of " desired value " and " threshold value " in below describing in detail.
Term " desired value " is used for representing the desired value of technological parameter at this, and regulating system contrast desired value is regulated, so that keep this value, but actual process parameter possibly depart from either large or small degree from these desired values.
Term " threshold value " is used for being illustrated in regulating system at this and carries out conditioning period, the threshold value that can not surpass with respect to above-mentioned desired value of technological parameter.Therefore, threshold value is a safety margins for the adjusting of boiling vessel.
System
Fig. 1 illustrates the system that is used to regulate continuous gas phase boiling vessel 50, and it has the outlet 52 that is used for paper pulp after the boiling segmenting the inlet 51 of cellulosic material and be positioned at the bottom of being used to that is positioned at the top.Inlet 51 is made up of the top separator with the feeder that makes progress at this.Boiling vessel comprises having the many boiling vessel streams that reclaim filter 60/63, pump 61/64 and center return duct 62/65 by traditional approach, but these streams itself do not constitute arbitrary part of the present invention.Yet any recovery stream in these streams can be used as from the part of boiling vessel and flows out pipeline and to reclaim streams with other monitored.
Process modulator PC is according to the discharge of current technology, for example the discharge LIQ of boiling liquid
RETWith discharge CH through the paper pulp of boiling
OUT, the influx of regulating related process, for example the influx CH of wood chip
INWith related boiling liquid ST, WL, DL.
Should be understood that the influx CH of wood chip
INFlowmeter capable of using 31, measure, measure through pump in the entrance pipe or chute watch-dog (sluice monitor) alternatively, and the adjusting of this flow can utilize valve 13 to control by process modulator through process modulator PC.
The influx of boiling liquid ST, WL, DL (being respectively steam, white liquid and diluent liquid) can utilize valve 12,11 and 10 to control respectively by process modulator PC.
Regulating through process modulator is at least during setting up continued operation, the level LIQ of the boiling liquid in boiling vessel
LEVOn and level (level) CH that in boiling vessel, is in the wood chip on the liquid water prosposition
LEVOn generate gas phase (space) ST
P, the level that can regulate wood chip is so that the power of the directed downwards on the column of chips in the adjustment boiling vessel.
The level that should be understood that wood chip is detected through chip water prosposition sensor (chip level sensor) 43 by process modulator.
Process modulator PC has first group of sensor 40,41,43; First group of sensor is connected to process modulator, and is used for controlling the input that 10,11,12,13, the first groups of adjusters of first group of adjuster are positioned at segmentation cellulosic material and boiling liquid to boiling vessel.Sensor 40,41,43 is made up of the pressure sensor in the boiling vessel, temperature sensor and fluid level level sensor respectively.
Preferably, adjuster 10,11,12,13 is a control valve, and these control valves are to diluent liquid or clean liquid DL, white liquid WL, the influx of steam SL and the influx CH of wood chip
INRegulate.
According to the present invention, system comprises the load governor LC that is independent of process modulator PC, and this load governor has second group of sensor 42; Second group of sensor is connected to load governor, and is used for controlling the input that 20,21,22,23, the second groups of adjusters of second group of adjuster are positioned at segmentation cellulosic material and boiling liquid to boiling vessel.
Process modulator is regulated the level of the pressure in the gas phase, wood chip and the level of liquid with respect to first group of desired value in the process modulator, and load governor is monitored the level of the pressure in the gas phase, wood chip and the level of liquid with respect to second group of threshold value in the load governor; Compare with the control that process modulator is carried out with respect to the related objective value, the interaction partners boiling vessel of the level of the pressure in the gas phase, the level of wood chip and liquid has provided higher load value.
When surpassing these threshold values, the load governor utilization is connected to second group of adjuster 20,21,22,23 of load governor and closes at least one relevant inflow.
The flow valve open in usual that the second group of adjuster 20,21,22,23 that is connected to load governor cuts out during by the threshold value of the controller that overloads is formed, and the adjusting to the influx and the discharge of boiling vessel that is independent of that process modulator carries out of these flow valves.
The second group of adjuster 20,21,22,23 that is connected to load governor also can be made up of the inflow that promotes boiling vessel or the current controller that helps the stream machine of outflow; When the threshold value of the controller that overloads; Current controller interrupts helping the operational power of stream machine, and these current controllers are independent of the adjusting of process modulator to the influx and the discharge of boiling vessel.
In order to increase the redundancy of second level; Can also through with respect to signal (these signals send from process modulator through appropriate signal shown in " X " in figure) to the affirmation that the sensor 42 of load governor LC carries out, check whether the sensor 42 of load governor LC correctly works.Method
Regulate continuous gas phase boiling vessel 50 according to the method for the invention, gas phase boiling vessel 50 has the inlet 51 and the outlet 52 through the paper pulp of boiling that is used for that is positioned at the bottom that are used to segment cellulosic material that is positioned at the top continuously.Process modulator PC is according to the discharge of current technology, for example boiling liquid LIQ
RETDischarge and through the discharge CH of the paper pulp of boiling
OUT, the influx of regulating related process, for example wood chip CH
INInflux and relevant boiling liquid ST, WL, DL.This adjusting is carried out in known manner, so that at least during setting up continued operation, and the liquid water prosposition LIQ in boiling vessel
LEVWith the level CH that in boiling vessel, is positioned at the wood chip on the fluid level position
LEVOn generate gas phase ST
PThe level of scalable wood chip is so that the power of the directed downwards on the column of chips in the adjustment boiling vessel.
According to the present invention, with respect to many first technological parameters of the first special process adjuster PC, control the input quantity of segmentation cellulosic material and boiling liquid, the load on the digester vessel is then monitored by the load governor LC that is independent of process modulator simultaneously.
Process modulator PC regulates pressure, the level of wood chip and the level of liquid in the gas phase with respect to first group of desired value of process modulator.
Load governor is with respect to pressure, the level of wood chip and the level of liquid in second group of desired value monitoring gas phase in the load governor; Compare with the control that process modulator is carried out with respect to the related objective value, the interaction partners boiling vessel of the pressure in the gas phase, the level of wood chip and liquid water prosposition provides higher load value.
When surpassing these threshold values, load governor is independent of process modulator to be regulated the inflow that this inflow applies, and closes at least one inflow of boiling vessel.
Method about the fixed threshold of liquid water prosposition and pressure
According to a preferred embodiment; Process modulator is regulated technology with respect to first desired value of the pressure at liquid water prosposition and boiling vessel top, and the gross pressure load that wherein is applied on the digester vessel according to current technological parameter adds highly that by the static state of liquid water prosposition the pressure at boiling vessel top provides.
In this embodiment; Load governor has at least one threshold value of gross pressure load, and wherein at least one threshold value of this gross pressure load is limited at least one pre-determined constant threshold value of liquid water prosposition in pre-determined constant threshold value of the pressure in the gas phase and the boiling vessel.
At the boiling vessel height is in the example of embodiment of 100m, and process modulator can be regulated technology with respect to the desired value that the liquid water prosposition is in 5 crust in desired value and the gas phase of 15m under the boiling vessel top.Thus the influx and the discharge of digesting technoloy are regulated,, still allow the correlation of these technological parameters to depart from conditioning period to reach these desired values.
Yet in the case, load governor can have the threshold value of 8 crust in predetermined threshold and the gas phase that the liquid water prosposition is in 10m under the boiling vessel top.In case surpass any in these threshold values, load governor just starts at least one inflow of positive closing.Can be independent of the adjusting of digesting technoloy in this way, realize the load safety of digester vessel.
Method about the fixed threshold of total load
According to second preferred embodiment of the present invention; Process modulator is regulated technology with respect to first desired value of the pressure at the top of liquid water prosposition and boiling vessel, and the gross pressure load that wherein is applied on the digester vessel according to current technological parameter is provided by the pressure that the static state of liquid water prosposition highly adds the boiling vessel top.
In this embodiment; Load governor has at least one threshold value of gross pressure load, and at least one threshold value of this gross pressure load is limited, provided by the level of the liquid of boiling vessel and the load sum of the pressure in the gas phase at least one pre-determined constant threshold value of the load of digester bottom.
At the boiling vessel height is in the example of embodiment of 100m, and process modulator can be regulated technology with respect to the desired value of 5 crust in the desired value of liquid water prosposition 15m under the top of boiling vessel and the gas phase.Thus the influx and the discharge of digesting technoloy are regulated,, still allow the correlation of these technological parameters to depart from conditioning period to reach these desired values.
Yet in the case, load governor can have the predetermined threshold of gross pressure load, and it is 8 situation of clinging to that the predetermined threshold of this gross pressure load is in 10m under the boiling vessel top and (pressure) threshold value in the gas phase corresponding to the level of liquid.Yet; The load of digester bottom is that the load sum by the pressure in liquid water prosposition and the gas phase in the boiling vessel provides; The load of digester bottom is corresponding to the pressure that highly is 8 crust in liquid column and the gas phase of 90m in the case, and promptly 9 crust add 8 crust, provide the summation of 17 crust.Therefore this 17 crust will be typical threshold value.
Regulate down at these, cling to as long as load is no more than 17, if the pressure then in the gas phase reduces simultaneously, the liquid water prosposition in the digester vessel just can raise a little.For example, if 7.5 crust are clung in the decline of the pressure in the gas phase 0.5, then can allow the liquid water prosposition to be elevated to the liquid water prosposition that is in 5m under the boiling vessel top.
Alternatively, under these conditions, as long as load is no more than 17 crust, if the liquid water prosposition of boiling vessel reduces simultaneously, the pressure in the gas phase just can raise a little.For example, if 8.5 crust are clung in the rising of the pressure in the gas phase 0.5, just can not allow the liquid water prosposition to be elevated to the liquid water prosposition that is in 15m under the boiling vessel top.
As long as surpass the threshold value of 17 crust, load governor just starts the positive closing of at least one inflow.Can realize the load safety that digesting technoloy is regulated that is independent of of digester vessel in this way.
The adjusting measure
When surpassing dependent thresholds, can use multiple adjusting strategy.
A kind of simple embodiment is as long as surpass threshold value, just to implement to carry out all adjusting measures simultaneously.Between system's installation period, this security strategy is the easiest coming into force usually.This possibly mean that closing all immediately can pently flow into.For example, wood chip CH
INStream, white liquid WL stream, diluent liquid DL stream and steam ST stream all can be closed immediately.
Alternatively, can be by the stage and depend on that the nargin that surpasses threshold value (if perhaps in certain startup period regulating action do not start) increases the quantity of the inflow of closing.First this type stage can be to close chip flow CH
IN, next be white liquid WL stream, diluent liquid DL stream and steam ST stream in order.
If surpass the pre-determined constant threshold value of air pressure, then air pressure had the parameter of main influence/flow into for example steam ST stream, chip flow CH
INCan close immediately or according to priority with white liquid WL stream.
If surpass the pre-determined constant threshold value of liquid water prosposition, then the liquid water prosposition had the for example white liquid WL stream of parameter/inflow, diluent liquid DL stream, the chip flow CH of main influence
INCan close immediately or according to priority with steam ST stream.
Except that closing inflow, can increase the discharge of boiling vessel by above-mentioned adjusting measure, for example through the discharge CH of the paper pulp of boiling
OUT, also can likewise increase recovery flow REC from the effluent of boiling vessel." REC " is used for representing the recovery section of the boiling liquid that consumes in the boiling vessel at this, and this recovery section can directly be delivered to and reclaim process part and maybe can pass through the black liquor impregnation portion (black liquor impregnation) that is positioned at before the boiling vessel and deliver to the recovery process part.
The load control of complementarity or replaceability
Fig. 2 illustrates a kind of load governor, and this load governor can complementally add to system shown in Figure 1, perhaps can replace load governor shown in Figure 1 fully.
The drain line 70 of boiling liquid in this modification, occurs being used for, this pipeline is controlled through the valve 71 of normally closing.In the drawings, this drain line is connected to and is positioned at filter segment 74 recovery chamber 73 afterwards, avoids being blocked by wood chip with the inlet of protecting pipeline.Reclaiming chamber 73 can be the part of existing boiling vessel stream, and reclaim chamber 73 can be on the well-regulated interval basis or can access additional on the basis intermittently through back flush.Valve in this modification is controlled by pressure sensor 42, and when pressure surpasses predeterminated level, load cell DP
2Can open valve 71.
Also pump 72 can be installed in the pipeline 70, so that promote drainage flow, the startup of this pump is parallelly connected with opening of valve 71.
The alternative of Fig. 2 illustrates at Fig. 3.In this modification of load control, the drain line 70 that is used for boiling liquid is connected to chamber 75, and chamber 75 directly is communicated with the inner space of boiling vessel, preferably is communicated with the inner space of boiling vessel through the filter segment of this chamber in the wall of boiling vessel.Pressure sensor 42 also is connected to this chamber 75 in this modification.Can protect the two inlet of above-mentioned pipeline and pressure sensor 42 not blocked in this way by wood chip.
In the reduced form of the load governor of Fig. 2 and Fig. 3, valve 71 can be replaced by mechanical type safety diaphragm (rupture disc), and this safety diaphragm breaks when pressure surpasses predeterminated level.Corresponding to pressure sensor before, parallel many groups pressure sensor 42, drain line 70 and valve 71 can be set in the case, so that increase the reliability of security system.
In the embodiment of all explanations; The sensor of preferably pressure measxurement being used 42 is positioned the height of as close as possible desired value corresponding to the liquid water prosposition; In the zone that is positioned at corresponding to 0-5m on the height of the desired value of liquid water prosposition as shown in Figure 2, in the zone that is positioned at corresponding to 0-5m under the height of the desired value of liquid water prosposition perhaps as shown in Figure 3.If pressure measxurement is carried out crossing general goal apart from the boiling vessel distance from top; The wood chip that then produces in the boiling vessel forms the risk that suspends and fill in; This suspension plug completely cut off pressure differential and make boiling vessel top and boiling vessel the bottom separately, make the detected pressure value of depths of boiling vessel can not represent the stress level of setting up at the top of boiling vessel for this reason.
Should be understood that when the air pressure at boiling vessel top is air pressure related objective value the threshold value of the liquid water prosposition among all embodiment of load governor is corresponding to the level of 5m at least under the top of boiling vessel.For example if this threshold value is set at 10m under the top of boiling vessel, and the air pressure desired value is 4 crust, if then air pressure drops to 0.5 crust under the desired value, then can allow the liquid water prosposition 5m that under the top of boiling vessel, raises.
The present invention can change with many modes in the framework of scope of patent protection.Key feature is that load governor is independently carried out security function.
Claims (9)
1. one kind in order to regulating the system of continuous gas phase boiling vessel (50), and said continuous gas phase boiling vessel has the inlet that is used to segment cellulosic material (51) that is positioned at the top and is positioned at the outlet (52) through the paper pulp of boiling that is used for of bottom; Wherein process modulator (PC) is according to the discharge of current technology, for example outflow (the LIQ of boiling liquid
RET) and through the outflow (CH of the paper pulp of boiling
OUT), regulate the inflow of related process, for example related boiling liquid (ST, WL, DL) and wood chip (CH
IN) inflow so that at least during setting up continued operation, the level (LIQ of the boiling liquid in said boiling vessel
LEV) on and the level (CH on the level that is positioned at said liquid of the wood chip in said boiling vessel
LEV) on generate gas phase (ST
P); The level of said wood chip can be conditioned, so that adjust the power of the directed downwards on the column of chips in the said boiling vessel, it is characterized in that:
Said process modulator comprises first group of sensor (40,41,43); Said first group of sensor is connected to said process modulator; And be used for controlling first group of adjuster (10,11,12,13); Said first group of adjuster is positioned at the input of said segmentation cellulosic material and said boiling liquid to said boiling vessel, and said system comprises:
Be independent of the load governor (LC) of said process modulator; Said load governor has second group of sensor (42); Said second group of sensor is connected to said load governor; And be used for controlling second group of adjuster (20,21,22,23,71), and said second group of adjuster influences the volume of the liquid in the said boiling vessel, and adjuster is preferably placed at segmentation cellulosic material and the inflow of boiling liquid and flows out in the stream of said boiling vessel;
And said process modulator is regulated pressure, the level of wood chip and the level of liquid in the gas phase with respect to first group of desired value in the said process modulator; And said load governor is monitored the load in the said boiling vessel with respect to second group of threshold value in the said load governor; Compare with the control that said process controller carries out the related objective value, the container of the said boiling vessel of interaction partners of said second group of threshold value provides higher load; And when surpassing these threshold values; Second group of adjuster (20,21,22,23,71) that said load governor utilization is connected to said load governor influences at least one relevant flowing of boiling liquid, makes that the net volume of liquid reduces in the said boiling vessel.
2. system according to claim 1; It is characterized in that; The flow valve open in usual that the said second group of adjuster (20,21,22,23) that is connected to said load governor cuts out during by the threshold value that surpasses said load governor is formed, and said flow valve be independent of said process modulator execution to the inflow of said boiling vessel and the adjusting of outflow.
3. system according to claim 1; It is characterized in that; The normally closed type flow valve that the said second group of adjuster (71) that is connected to said load governor opened during by the threshold value that surpasses said load governor is formed, and said flow valve be independent of said process modulator execution to the inflow of said boiling vessel and the adjusting of outflow.
4. according to claim 2 or 3 described systems; It is characterized in that; The said second group of adjuster (20,21,22,23) that is connected to said load governor also is made up of the inflow that promotes said boiling vessel and the current controller that helps the stream machine of outflow; When surpassing the threshold value of said load governor, said current controller interrupts the said operational power that helps the stream machine, and said current controller is independent of said process modulator to the inflow of said boiling vessel and the adjusting of outflow.
5. system according to claim 3; It is characterized in that; The said second group of adjuster that is connected to said load governor comprises drain line (70), and said drain line is connected on the housing of said boiling vessel and is arranged in the level (LIQ of said boiling vessel boiling liquid
LEV) under the position, opened by valve gear (71) when said drain line (70) can be worked as the threshold value that surpasses said load governor, and said valve gear (71) be independent of that said process modulator carries out to the inflow of said boiling vessel and the adjusting of outflow.
6. one kind in order to regulating the method for continuous gas phase boiling vessel (50), and said continuous gas phase boiling vessel has the opening that is used to segment cellulosic material (51) that is positioned at the top and is positioned at the outlet (52) through the paper pulp of boiling that is used for of bottom; Wherein process modulator (PC) is according to the outflow of current technology, for example outflow (the LIQ of boiling liquid
RET) and through the outflow (CH of the paper pulp of boiling
OUT), regulate the inflow of related process, the for example related boiling liquid (ST, WL, DL) and the inflow (CH of wood chip
IN), so that at least during setting up continued operation, the level (LIQ of the boiling liquid in said boiling vessel
LEV) on and the level (CH on the level that is positioned at said liquid of the wood chip in said boiling vessel
LEV) on generate gas phase (ST
P); The level of said wood chip can be conditioned, so that adjust the power of directed downwards on the column of chips in the said boiling vessel, it is characterized in that:
With respect to a plurality of first technological parameters of the first special process adjuster (PC), control input to said boiling vessel segmentation cellulosic material and boiling liquid; And
Through being independent of the load governor of said process modulator, monitor the load on the container of said boiling vessel;
And said process modulator is regulated pressure, the level of wood chip and the level of liquid in the gas phase with respect to first group of desired value in the said process modulator; And said load governor is monitored the load in the said boiling vessel with respect to second group of threshold value; Compare with the control that said process controller carries out the related objective value, the container of the said boiling vessel of interaction partners of said second group of threshold value provides higher pressure load; And when surpassing these threshold values, said load governor is independent of the adjusting that said process modulator is carried out, and influences at least one inflow or outflow to said boiling vessel, makes that the net volume of liquid reduces in the said boiling vessel.
7. method according to claim 6 is characterized in that:
Said process modulator is regulated technology with respect to first desired value of the top pressure of the level of said liquid and said boiling vessel, wherein provides the gross pressure load on the container that current technological parameter is applied to said boiling vessel by the top pressure sum of the static height of the level of said liquid and said boiling vessel;
And said load governor has at least one threshold value of gross pressure load, and at least one threshold value of said gross pressure load is limited the pre-determined constant threshold value of the pressure at least one pre-determined constant threshold value of the level of liquid in the said boiling vessel and the gas phase.
8. method according to claim 6 is characterized in that:
When surpassing at least one threshold value, at least one liquid that the adjuster that said load governor utilization is independent of said process modulator cuts out said boiling vessel flows into.
9. according to claim 7 or 8 described methods, it is characterized in that:
When surpassing at least one threshold value of said load governor, through being independent of the adjuster of said process modulator, the part of boiling liquid is deflected from said boiling vessel via the pipeline of otherwise closing.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE0950210A SE533670C2 (en) | 2009-04-01 | 2009-04-01 | System and method for controlling a continuous steam phase boiler |
| SE0950210-5 | 2009-04-01 | ||
| PCT/SE2010/050351 WO2010114470A1 (en) | 2009-04-01 | 2010-03-30 | System and method for the regulation of a continuous vapour phase digester |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102449233A true CN102449233A (en) | 2012-05-09 |
| CN102449233B CN102449233B (en) | 2014-06-11 |
Family
ID=42828552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201080024334.2A Expired - Fee Related CN102449233B (en) | 2009-04-01 | 2010-03-30 | System and method for the regulation of a continuous vapour phase digester |
Country Status (5)
| Country | Link |
|---|---|
| CN (1) | CN102449233B (en) |
| BR (1) | BRPI1014045B1 (en) |
| RU (1) | RU2503763C2 (en) |
| SE (1) | SE533670C2 (en) |
| WO (1) | WO2010114470A1 (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1905050A (en) * | 1932-04-29 | 1933-04-25 | Nekoosa Edwards Paper Co | Apparatus for and method of cooking wood pulp |
| US4028171A (en) * | 1974-07-05 | 1977-06-07 | Kamyr Aktiebolag | Method for continuous treatment of fiber material in a vertical array |
| WO1994009203A1 (en) * | 1992-10-20 | 1994-04-28 | Kamyr, Inc. | Completely countercurrent cook continuous digester |
| CN1091792A (en) * | 1992-11-18 | 1994-09-07 | 卡米尔公司 | The method of continuous cooking of pulp |
| US6174411B1 (en) * | 1997-02-10 | 2001-01-16 | Andritz-Ahlstrom Inc. | Continuous digester with inverted top separator |
| WO2004005609A1 (en) * | 2002-07-03 | 2004-01-15 | Kvaerner Pulping Ab | A method and a digester for the continuous cooking of wood raw material to cellulose pulp |
| WO2007064293A1 (en) * | 2005-11-29 | 2007-06-07 | Metso Fiber Karlstad Ab | Method and device for the continuous cooking of pulp |
| WO2008103124A1 (en) * | 2007-02-23 | 2008-08-28 | Metso Fiber Karlstad Ab | Vapour phase digester and a method for continuous cooking |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU666524A1 (en) * | 1976-05-04 | 1979-06-05 | Всесоюзное научно-производственное объединение целлюлозно-бумажной промышленности | Method of automatic control of sulphite pulp digesting process |
| SU1346714A1 (en) * | 1985-12-09 | 1987-10-23 | Институт Проблем Моделирования В Энергетике Ан Усср | System for controlling temperature in sulfate pulp digester |
| SU1497317A1 (en) * | 1987-01-16 | 1989-07-30 | Институт Проблем Моделирования В Энергетике Ан Усср | Automatic control system for intermittent-action reactor |
| WO1998035090A1 (en) * | 1997-02-09 | 1998-08-13 | Kvaerner Pulping Ab | Continuous method for producing pulp with spent liquor impregnation |
-
2009
- 2009-04-01 SE SE0950210A patent/SE533670C2/en not_active IP Right Cessation
-
2010
- 2010-03-30 CN CN201080024334.2A patent/CN102449233B/en not_active Expired - Fee Related
- 2010-03-30 WO PCT/SE2010/050351 patent/WO2010114470A1/en active Application Filing
- 2010-03-30 RU RU2011144147/12A patent/RU2503763C2/en active
- 2010-03-30 BR BRPI1014045-0A patent/BRPI1014045B1/en not_active IP Right Cessation
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1905050A (en) * | 1932-04-29 | 1933-04-25 | Nekoosa Edwards Paper Co | Apparatus for and method of cooking wood pulp |
| US4028171A (en) * | 1974-07-05 | 1977-06-07 | Kamyr Aktiebolag | Method for continuous treatment of fiber material in a vertical array |
| WO1994009203A1 (en) * | 1992-10-20 | 1994-04-28 | Kamyr, Inc. | Completely countercurrent cook continuous digester |
| CN1091792A (en) * | 1992-11-18 | 1994-09-07 | 卡米尔公司 | The method of continuous cooking of pulp |
| US6174411B1 (en) * | 1997-02-10 | 2001-01-16 | Andritz-Ahlstrom Inc. | Continuous digester with inverted top separator |
| WO2004005609A1 (en) * | 2002-07-03 | 2004-01-15 | Kvaerner Pulping Ab | A method and a digester for the continuous cooking of wood raw material to cellulose pulp |
| WO2007064293A1 (en) * | 2005-11-29 | 2007-06-07 | Metso Fiber Karlstad Ab | Method and device for the continuous cooking of pulp |
| WO2008103124A1 (en) * | 2007-02-23 | 2008-08-28 | Metso Fiber Karlstad Ab | Vapour phase digester and a method for continuous cooking |
Also Published As
| Publication number | Publication date |
|---|---|
| SE533670C2 (en) | 2010-11-30 |
| CN102449233B (en) | 2014-06-11 |
| BRPI1014045B1 (en) | 2019-06-04 |
| SE0950210A1 (en) | 2010-10-02 |
| RU2011144147A (en) | 2013-05-10 |
| RU2503763C2 (en) | 2014-01-10 |
| WO2010114470A1 (en) | 2010-10-07 |
| BRPI1014045A2 (en) | 2016-04-12 |
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