CN102449233B - 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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- CN102449233B CN102449233B CN201080024334.2A CN201080024334A CN102449233B CN 102449233 B CN102449233 B CN 102449233B CN 201080024334 A CN201080024334 A CN 201080024334A CN 102449233 B CN102449233 B CN 102449233B
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- 238000000034 method Methods 0.000 title claims abstract description 117
- 230000008569 process Effects 0.000 claims abstract description 89
- 238000009835 boiling Methods 0.000 claims description 197
- 239000007788 liquid Substances 0.000 claims description 117
- 239000002023 wood Substances 0.000 claims description 40
- 230000004941 influx Effects 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 21
- 229920001131 Pulp (paper) Polymers 0.000 claims description 15
- 230000011218 segmentation Effects 0.000 claims description 9
- 230000003068 static effect Effects 0.000 claims description 7
- 230000003993 interaction Effects 0.000 claims description 6
- 230000001143 conditioned effect Effects 0.000 claims description 3
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- 230000001105 regulatory effect Effects 0.000 abstract description 12
- 239000012530 fluid Substances 0.000 abstract description 7
- 238000010411 cooking Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 41
- 238000011084 recovery Methods 0.000 description 8
- 230000004048 modification Effects 0.000 description 7
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- 230000001276 controlling effect Effects 0.000 description 5
- 239000003085 diluting agent Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000003750 conditioning effect Effects 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 2
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- 238000005520 cutting process Methods 0.000 description 1
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Classifications
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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 the system and method for the continuous gas phase boiling vessel for regulating production of cellulose paper pulp.
Background technology
Have be arranged in top for segmenting the entrance of cellulosic material (finely divided cellulose material) and being positioned at the existing system of continuous gas phase boiling vessel of the outlet for the paper pulp through boiling of bottom, the standard that gas phase boiling vessel is always full of liquid based on boiling vessel is determined size.Since Metso Fiber Karlstad AB(is then taking the name of Kamyr AB) production capacity is installed in nineteen fifty as the First boiling vessel of 50 air-dry metric ton/24 hours (ADMT/24h) at Fengerfors, until be about 4 at the lndah of Indonesia Kiat, Jambi and Lontar Papyrus installation production capacity in 2007, since the gas phase boiling vessel of 000 air-dry tonne/24 hours, the technology of this definite size has become criterion, for being called as the boiling vessel of gas type " kamyr digester ".
In the time setting up continued operation, this means over dimensioning of above-mentioned boiling vessel, because in the normal operation period, distance quite far away under the top of the liquid water prosposition of foundation in boiling vessel.In large-scale boiling vessel workshop, when operation is while having set up, liquid is positioned under the top of boiling vessel approximately 10m place, and this is corresponding to reducing by 1 bar static pressure on boiling vessel housing.The size of boiling vessel is also determined with respect to the nominal pressure desired value in gas phase, and this can be the predetermined target value of interval 3-8 bar.Highly, for pressure in 100m, gas phase is in the boiling vessel of 5 bar, design pressure is filled with pressure sum, i.e. 15 bar in the static pressure of boiling vessel of liquid and gas phase by being.
Therefore, the mainly related objective value based on being filled with pressure in the container of liquid and gas phase, the secondly associated temperature of heat load based on determining digester vessel, determines the size of boiling vessel housing.Also can consider whether boiling vessel is arranged on the such fact of geographical zone that is subject to earthquake.All these determine that the standard of size all makes the thickness of material to increase, and not only to meet the main standard of determining size, but also meet minor criteria, and this further increases the consumption of material and cost.If can affect for instance the main standard of determining size, so can manufactured materials consumption and the obviously complete boiling vessel of reduction of cost of investment consumption.
Summary of the invention
Goal of the invention
First object of the present invention is the continuous steamer of manufacturing for predetermined operational parameters, and wherein the cost of boiling vessel can reduce the amount that approaches 10%, still meets the standard of determining size simultaneously.
Second object is to reduce the consumption of sheet metal, can not make raw-material available supply bear the economy manufacture of excessive boiling vessel to realize.Between many decades, the burden that reduces natural resources has become even even more important in the past.This just requires to meet for particular batch the particular demands of economical apparatus.
The 3rd object is during setting up stable operation, guarantees the nargin of boiling vessel under the extreme operating condition that departs from normal operating condition.
Invention summary
The present invention relates to a kind of in order to regulate the system of continuous gas phase boiling vessel, this continuous gas phase boiling vessel have be positioned at top for segment cellulosic material entrance and be positioned at bottom the outlet for the paper pulp through boiling.Related process flows into (amount), and the inflow (amount) of for example wood chip and associated boiling liquid (cooking fluid) is regulated for example, according to the outflow of current technique (amount) (outflow of boiling liquid (amount)) 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, on the horizontal position of the wood chip on the horizontal position that is positioned at liquid on the horizontal position of the boiling liquid in boiling vessel and in boiling vessel, generate gas phase (space), the horizontal position of wood chip can be conditioned, to adjust the power of the sensing below in the column of chips in 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 segmentation cellulosic material and the boiling liquid input 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 segmentation cellulosic material and the boiling liquid input to boiling vessel.
Process modulator, with respect to first group of desired value in process modulator, regulates the pressure in gas phase (space), horizontal position and the liquid water prosposition of wood chip; And load governor is with respect to second group of threshold value in load governor, monitor the pressure in gas phase (space), horizontal position and the liquid water prosposition of wood chip; Compared with the control of carrying out with respect to current target value with process modulator, the interaction of pressure, the horizontal position of wood chip and the horizontal position of liquid in gas phase (space) provides higher load value to boiling vessel.In the time exceeding these threshold values, load governor utilization is connected to second group of adjuster of load governor and closes at least one relevant inflow, and the net volume of liquid in boiling vessel is reduced.
The second group of adjuster that is connected to load governor is preferably by forming normally setting up operating period flow valve open in usual (open flow valve), and this valve cuts out in the time overloading the threshold value of controller.These flow valves are independent of the adjusting that the influx of process modulator to boiling vessel and discharge apply.
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 stream machine for transporting inflow or the effluent of boiling vessel.These current controllers interrupt helping the operational power of stream machine in the time overloading the threshold value of controller.These current controllers are also independent of the adjusting that the influx of process modulator to boiling vessel and discharge apply.
The method according to this invention relates to the adjusting to continuous vapour phase digester, this continuous vapour phase cooking appliance have be positioned at top for segment cellulosic material entrance and be positioned at bottom the outlet for the paper pulp through boiling.Related process influx, the influx of for example wood chip and associated boiling liquid, for example, is regulated according to the discharge of current technique (discharge of boiling liquid and the discharge through the paper pulp of boiling) by process modulator.Carry out this adjusting in order that at least during setting up continued operation, on the horizontal position of the boiling liquid in boiling vessel and be positioned on the horizontal position of the wood chip on fluid level position and generate gas phase in boiling vessel.Can regulate the horizontal position of wood chip, to adjust the power of pointing to below in the column of chips in boiling vessel.
According to the method, control the input of segmentation cellulosic material and boiling liquid with respect to multiple first technological parameters of the first special process adjuster, monitor the load on the container of boiling vessel by being independent of the load governor of process modulator simultaneously.Process modulator, with respect to first group of desired value in process modulator, regulates the pressure in gas phase, horizontal position and the liquid water prosposition of wood chip; And load governor is with respect to second group of threshold value in load governor, monitor the pressure in gas phase, horizontal position and the liquid water prosposition of wood chip.Compared with the control of carrying out with respect to current target value with process modulator, the interaction of the horizontal position of the pressure in gas phase, the horizontal position of wood chip and liquid provides higher load value to boiling vessel; And in the time exceeding these threshold values, load governor is independent of process modulator and is applied to the adjusting in this inflow, at least one of closing boiling vessel flows into, and the net volume of liquid in boiling vessel is reduced.
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, to come operation of digester workshop with respect to the current target value in process modulator, and thering is the independently security system for load governor, this allows to adopt in boiling vessel possible high total pressure to load to determine the size of complete boiling vessel.
In a preferred embodiment of the method, process controller is with respect to the first object value control technique of liquid water prosposition and boiling vessel top pressure, and the gross pressure load being wherein derived from the digester vessel of current technological parameter is provided with the pressure sum in the gas phase of boiling vessel top by the static height of liquid water prosposition; And load governor has at least one predetermined threshold of gross pressure load, at least one predetermined threshold of gross pressure load is limited by the fixing predetermined threshold of the pressure at least one predetermined fixed threshold and the gas phase of the horizontal position of liquid in boiling vessel.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 bar, the load of the liquid water prosposition of 10m under the top of boiling vessel; And if exceed any in these fixed thresholds, load governor will start.
In second preferred embodiment of the method, process modulator is controlled technique with respect to the first object value of the pressure at liquid water prosposition and boiling vessel top, and the gross pressure load being wherein derived from the digester vessel of current technological parameter is provided with the pressure sum in the gas phase of boiling vessel top by the static height of liquid water prosposition; And load governor has at least one threshold value of gross pressure load, at least one threshold value of gross pressure load is limited, is provided by the pressure sum in load and the gas phase of liquid water prosposition in boiling vessel by least one predetermined fixed threshold 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 bar, the load of the liquid water prosposition of 10m under boiling vessel top, if but the pressure decreased in gas phase, the threshold value of the liquid water prosposition corresponding degree that raises.
(the wherein safe water prosposition of liquid 11m place under boiling vessel top in an application scheme for continuous gas phase boiling vessel of the present invention, total building height is 72.5m, base diameter is greater than 12m, and there is predetermined operating parameter with respect to top pressure, capacity, temperature), totle drilling cost (adopt in April, 2008 material price) can be reduced to 21.2 hundred ten thousand Swedish krona from approximately 23.5 hundred ten thousand Swedish krona (SEK), therefore save in other words 2.3 hundred ten thousand Swedish krona, saved accordingly approximately 10%.
Brief description of the drawings
Fig. 1 illustrates in principle according to of the present invention for regulating the system of continuous steamer;
Fig. 2 illustrates according to load governor replaceability of the present invention or complementarity; And
Fig. 3 illustrates the modification of Fig. 2.
Detailed description of the invention
In below describing in detail, will use the concept of " desired value " and " threshold value ".
The desired value that term " desired value " is used for representing technological parameter at this, regulating system contrast desired value regulates, to maintain this value, but actual process parameter may 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 exceed with respect to above-mentioned desired value of technological parameter.Therefore, threshold value is safety margins for the adjusting of boiling vessel.
System
Fig. 1 illustrates the system for regulating continuous gas phase boiling vessel 50, its have be positioned at top for segment the entrance 51 of cellulosic material and be positioned at bottom the outlet 52 for paper pulp after boiling.Entrance 51 forms by having the upwards top separator of feeder 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 in a traditional way, but these streams itself do not form arbitrary part of the present invention.But any recovery stream in these streams can be used as from the part of boiling vessel and flows out pipeline and monitored together with other reclaim streams.
Process modulator PC is according to the discharge of current technique, for example discharge LIQ of boiling liquid
rETdischarge CH with the paper pulp through boiling
oUT, regulate the influx of related process, the influx CH of for example wood chip
iNwith associated boiling liquid ST, WL, DL.
Should be understood that the influx CH of wood chip
iNcan utilize flowmeter 31, measure by process modulator PC, measure by the pump in entrance pipe or chute watch-dog (sluice monitor) alternatively, and the adjusting of this flow can utilize valve 13 to control by process modulator.
The influx (being respectively steam, white liquid and diluent liquid) of boiling liquid ST, WL, DL can utilize respectively valve 12,11 and 10 to control by process modulator PC.
Regulating by process modulator is at least during setting up continued operation, the horizontal position LIQ of the boiling liquid in boiling vessel
lEVon and in boiling vessel horizontal position (level) CH of the wood chip on liquid water prosposition
lEVon generate gas phase (space) ST
p, can regulate the horizontal position of wood chip, to adjust the power of the below of the sensing in column of chips in boiling vessel.
The horizontal position that should be understood that wood chip is detected by 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 10,11,12,13, the first groups of adjusters of first group of adjuster and is positioned at segmentation cellulosic material and the boiling liquid input to boiling vessel.Sensor 40,41,43 is made up of the pressure sensor in boiling vessel, temperature sensor and fluid level level sensor respectively.
Preferably, adjuster 10,11,12,13 is control valve, and these control valves are to diluent liquid or clean liquid DL, white liquid WL, the influx of steam ST 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 20,21,22,23, the second groups of adjusters of second group of adjuster and is positioned at segmentation cellulosic material and the boiling liquid input to boiling vessel.
With respect to first group of desired value in process modulator, the horizontal position to the pressure in gas phase, wood chip and the horizontal position of liquid regulate process modulator, and load governor with respect to second group of threshold value in load governor the horizontal position to the pressure in gas phase, wood chip and the horizontal position of liquid monitor; Compared with the control of carrying out with respect to related objective value with process modulator, the interaction of the horizontal position of the pressure in gas phase, the horizontal position of wood chip and liquid has provided higher load value to boiling vessel.
In the time exceeding these threshold values, 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 of cutting out while being connected to second group of adjuster, 20,21,22,23 threshold value by the controller that overloads of load governor forms, and these flow valves are independent of the influx to boiling vessel that process modulator carries out and the adjusting of discharge.
The second group of adjuster 20,21,22,23 that is connected to load governor also can be by promoting the inflow of boiling vessel or the current controller that helps stream machine of outflow to form, in the time of 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 influx of process modulator to boiling vessel and the adjusting of discharge.
In order to increase the redundancy of the second horizontal position, can also be by the confirmation of the sensor 42 of load governor LC being carried out with respect to signal (these signals send from process modulator by signal suitable as shown in " X " in figure), check whether the sensor 42 of load governor LC correctly works.Method
The method according to this invention regulates continuous gas phase boiling vessel 50, continuously gas phase boiling vessel 50 have be positioned at top for segmenting the entrance 51 of cellulosic material and being positioned at the outlet 52 for the paper pulp through boiling of bottom.Process modulator PC is according to the discharge of current technique, for example boiling liquid LIQ
rETdischarge and through the discharge CH of the paper pulp of boiling
oUT, regulate the influx of 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 horizontal position CH that is positioned at the wood chip on fluid level position in boiling vessel
lEVon generate gas phase ST
p.The horizontal position of adjustable wood chip, to adjust the power of the below of the sensing in column of chips in 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 in digester vessel is monitored by the load governor LC that is independent of process modulator simultaneously.
Process modulator PC regulates pressure, the horizontal position of wood chip and the horizontal position of liquid in gas phase with respect to first group of desired value of process modulator.
Load governor is with respect to pressure, the horizontal position of wood chip and the horizontal position of liquid in second group of desired value monitoring gas phase in load governor, compared with the control of carrying out with respect to related objective value with process modulator, the interaction of the pressure in gas phase, the horizontal position of wood chip and liquid water prosposition provides higher load value to boiling vessel.
In the time exceeding these threshold values, load governor is independent of the inflow adjusting that process modulator applies this inflow, closes at least one inflow of boiling vessel.
About the method for the fixed threshold of liquid water prosposition and pressure
According to a preferred embodiment, process modulator is carried out adjusting process with respect to the first object value of the pressure at liquid water prosposition and boiling vessel top, and the gross pressure load being wherein applied in digester vessel according to current technological parameter highly adds 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 by least one predetermined fixed threshold of liquid water prosposition in predetermined fixed threshold of the pressure in gas phase and boiling vessel.
In the example of the embodiment that is 100m at boiling vessel height, process modulator can be carried out adjusting process with respect to the desired value of 5 bar in the desired value of liquid water prosposition 15m under boiling vessel top and gas phase.Influx to digesting technoloy and discharge regulate thus, to reach these desired values, but allow the correlation of these technological parameters to depart from conditioning period.
But in the case, load governor can have the threshold value of 8 bar in the predetermined threshold of liquid water prosposition 10m under boiling vessel top and gas phase.Once exceed any in these threshold values, load governor just starts at least one inflow of positive closing.Can be independent of in this way the adjusting of digesting technoloy, realize the load safety of digester vessel.
About the method for the fixed threshold of total load
According to the second preferred embodiment of the present invention, process modulator is carried out adjusting process with respect to the first object value of the pressure at the top of liquid water prosposition and boiling vessel, is wherein applied to according to current technological parameter the pressure that gross pressure in digester vessel load highly adds boiling vessel top by the static state of liquid water prosposition and provides.
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 load sum of the pressure in horizontal position and the gas phase of the liquid of boiling vessel by least one predetermined fixed threshold of the load of digester bottom.
In the example of the embodiment that is 100m at boiling vessel height, process modulator can be carried out adjusting process with respect to the desired value of 5 bar in the desired value of liquid water prosposition 15m under the top of boiling vessel and gas phase.Influx to digesting technoloy and discharge regulate thus, to reach these desired values, but allow the correlation of these technological parameters to depart from conditioning period.
But in the case, load governor can have the predetermined threshold of gross pressure load, the predetermined threshold of this gross pressure load is the situation of 8 bar corresponding to the horizontal position of liquid (pressure) threshold value in 10m and gas phase under boiling vessel top.But, the load of digester bottom is to be provided by the load sum of the pressure in liquid water prosposition and gas phase in boiling vessel, the load of digester bottom is corresponding to the pressure that is highly 8 bar in the liquid column of 90m and gas phase in the case, and 9 bar add 8 bar, provide the summation of 17 bar.Therefore this 17 bar will be typical threshold value.
Under these regulate, as long as load is no more than 17 bar, if the pressure in gas phase reduces simultaneously, the liquid water prosposition in digester vessel just can raise a little.For example,, if 0.5 bar of the pressure drop in gas phase to 7.5 bar, can allow liquid water prosposition to be elevated to the liquid water prosposition of 5m under boiling vessel top.
Alternatively, under these conditions, as long as load is no more than 17 bar, if the liquid water prosposition of boiling vessel reduces simultaneously, the pressure in gas phase just can raise a little.For example, if the pressure in gas phase raises, 0.5 bar, to 8.5 bar, just can not allow liquid water prosposition to be elevated to the liquid water prosposition of 15m under boiling vessel top.
As long as exceed the threshold value of 17 bar, load governor just starts the positive closing of at least one inflow.Can realize in this way the load safety that digesting technoloy regulates that is independent of of digester vessel.
Adjusting measure
In the time exceeding dependent thresholds, can use multiple regulation strategy.
A kind of simple embodiment is, as long as exceed threshold value, just to implement to carry out all adjusting measures simultaneously.Between system installation period, this security strategy usually the most easily comes into force.This may mean, closes immediately all can pently inflow.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 (if or within certain startup period regulating action do not start) that exceedes threshold value increases the quantity of the inflow of closing.First this class stage can be to close chip flow CH
iN, be next white liquid WL stream, diluent liquid DL stream and steam ST stream in order.
If exceed the predetermined fixed threshold of air pressure, air pressure is had to the parameter of major effect/flow into for example steam ST stream, chip flow CH
iNcan close immediately or according to priority with white liquid WL stream.
If exceed the predetermined fixed threshold of liquid water prosposition, liquid water prosposition there is parameter/inflow for example white liquid WL stream, diluent liquid DL stream, the chip flow CH of major effect
iNcan close immediately or according to priority with steam ST stream.
Except closing inflow, can increase by above-mentioned adjusting measure the discharge of boiling vessel, for example, through the discharge CH of the paper pulp of boiling
oUT, also can similarly increase the recovery flow REC from the effluent of boiling vessel.The recovery section of the boiling liquid that " REC " consumes in this is used for representing boiling vessel, this recovery section can directly be delivered to recovery process portion maybe can deliver to recovery process portion through being positioned at boiling vessel black liquor impregnation portion (black liquor impregnation) before.
The load control of complementarity or replaceability
Fig. 2 illustrates a kind of load governor, and this load governor can complementally add to the system shown in Fig. 1, or can replace the load governor shown in Fig. 1 completely.
In this modification, occur the drain line 70 for boiling liquid, this pipeline is controlled by 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, to protect the entrance of pipeline to avoid being blocked by wood chip.Reclaiming chamber 73 can be a part for existing boiling vessel stream, and reclaims chamber 73 and can in well-regulated interval basis or on basis intermittently, can be supplemented by back flush.Valve in this modification is controlled by pressure sensor 42, and in the time that pressure exceedes predeterminated level, load cell DP
2can open valve 71.
The alternative of Fig. 2 illustrates at Fig. 3.In this modification of controlling at load, be connected to chamber 75 for the drain line 70 of boiling liquid, chamber 75 is directly communicated with the inner space of boiling vessel, is preferably communicated with the inner space of boiling vessel by the filter segment of this chamber in the wall of boiling vessel.In this modification, pressure sensor 42 is also connected to this chamber 75.Can protect in this way the two entrance of above-mentioned pipeline and pressure sensor 42 not blocked by wood chip.
In the reduced form of the load governor of Fig. 2 and Fig. 3, valve 71 can be replaced by safety mechanical film (rupture disc), and this safety diaphragm breaks in the time that pressure exceedes 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, to increase the reliability of security system.
In the embodiment of all explanations, the sensor 42 of preferably pressure measxurement being used is positioned the height near the desired value corresponding to liquid water prosposition as far as possible, be positioned at as shown in Figure 2 in the region corresponding to 0-5m on the height of the desired value of liquid water prosposition, or be positioned at as shown in Figure 3 in the region corresponding to 0-5m under the height of the desired value of liquid water prosposition.If pressure measxurement is carried out crossing general goal apart from boiling vessel distance from top, the wood chip producing in boiling vessel forms the risk that suspends and fill in, this suspension plug completely cut off pressure differential and make the top of boiling vessel and the bottom of boiling vessel separately, make the detected pressure value of the 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 in the time that the air pressure at boiling vessel top is air pressure related objective value, the threshold value of the liquid water prosposition in all embodiment of load governor is corresponding to the horizontal position of 5m at least under the top of boiling vessel.If 10m under the top that for example this Threshold is boiling vessel, and air pressure desired value is 4 bar, if air pressure drops to 0.5 bar under desired value, can allow the liquid water prosposition 5m that raises under the top of boiling vessel.
The present invention can change in many ways in the framework of scope of patent protection.Key feature is that load governor is independently carried out security function.
Claims (13)
1. in order to regulate a system for continuous gas phase boiling vessel (50), described continuous gas phase boiling vessel have be positioned at top for segmenting the entrance (51) of cellulosic material and being positioned at the outlet for the paper pulp through boiling (52) of bottom; Wherein process modulator (PC) regulates the influx of related process according to the discharge of current technique, so that at least during setting up continued operation, and the horizontal position (LIQ of the boiling liquid in described boiling vessel
lEV) on and in described boiling vessel, be positioned at the horizontal position (CH of the wood chip on the horizontal position of described liquid
lEV) on generate gas phase (ST
p); The horizontal position of described wood chip can be conditioned, to adjust the power of the sensing below in the column of chips in described boiling vessel, it is characterized in that:
Described process modulator comprises first group of sensor (40,41,43); Described first group of sensor is connected to described process modulator, and be used for controlling first group of adjuster (10,11,12,13), described first group of adjuster is positioned at described segmentation cellulosic material and the extremely input of described boiling vessel of described boiling liquid, and described system comprises:
Be independent of the load governor (LC) of described process modulator, described load governor has second group of sensor (42), described second group of sensor is connected to described load governor, and be used for controlling second group of adjuster (20,21,22,23,71), described second group of adjuster affects the volume of the liquid in described boiling vessel, and adjuster is arranged in segmentation cellulosic material and the inflow of boiling liquid and flows out the stream of described boiling vessel;
And described process modulator, with respect to first group of desired value in described process modulator, regulates pressure, the horizontal position of wood chip and the horizontal position of liquid in gas phase; And described load governor, with respect to second group of threshold value in described load governor, is monitored the load in described boiling vessel; Compared with the control of related objective value being carried out with described process controller, the interaction of described second group of threshold value provides higher load to the container of described boiling vessel; And in the time exceeding these threshold values, second group of adjuster (20,21,22,23,71) that described load governor utilization is connected to described load governor affects at least one relevant flowing of boiling liquid, and the net volume of liquid in described boiling vessel is reduced.
2. system according to claim 1, is characterized in that, the discharge of described current technique is the discharge (LIQ of boiling liquid
rET) and through the discharge (CH of the paper pulp of boiling
oUT), the influx of described related process is associated boiling liquid (ST, WL, DL) and wood chip (CH
iN) influx.
3. system according to claim 1 and 2, it is characterized in that, the described second group of adjuster (20,21,22,23) that is connected to described load governor by exceed described load governor threshold value time the flow valve open in usual of closing form, and described flow valve is independent of the inflow to described boiling vessel that described process modulator carries out and the adjusting of outflow.
4. system according to claim 1 and 2, it is characterized in that, the described second group of adjuster (71) that is connected to described load governor by exceed described load governor threshold value time the normally closed type flow valve opened form, and described flow valve is independent of the inflow to described boiling vessel that described process modulator carries out and the adjusting of outflow.
5. system according to claim 3, it is characterized in that, be connected to described second group of adjuster (20,21,22,23) of described load governor also by promoting the inflow of described boiling vessel and the current controller that helps stream machine of outflow to form, in the time exceeding the threshold value of described load governor, described in described current controller interrupts, help the operational power of stream machine, and described current controller is independent of the inflow of described process modulator to described boiling vessel and the adjusting of outflow.
6. system according to claim 4, it is characterized in that, be connected to described second group of adjuster (20,21,22,23) of described load governor also by promoting the inflow of described boiling vessel and the current controller that helps stream machine of outflow to form, in the time exceeding the threshold value of described load governor, described in described current controller interrupts, help the operational power of stream machine, and described current controller is independent of the inflow of described process modulator to described boiling vessel and the adjusting of outflow.
7. system according to claim 4, it is characterized in that, the described second group of adjuster that is connected to described load governor comprises drain line (70), and described drain line is connected on the housing of described boiling vessel and is arranged in the horizontal position (LIQ of described boiling vessel boiling liquid
lEV) under position, when described drain line (70) can be worked as the threshold value that exceedes described load governor, opened by valve gear (71), and described valve gear (71) is independent of the inflow to described boiling vessel of described process modulator execution and the adjusting of outflow.
8. in order to regulate a method for continuous gas phase boiling vessel (50), described continuous gas phase boiling vessel have be positioned at top for segmenting the opening (51) of cellulosic material and being positioned at the outlet for the paper pulp through boiling (52) of bottom; Wherein process modulator (PC) regulates the influx of related process according to the discharge of current technique, so that at least during setting up continued operation, and the horizontal position (LIQ of the boiling liquid in described boiling vessel
lEV) on and the horizontal position (CH of wood chip on the horizontal position that is positioned at described liquid in described boiling vessel
lEV) on generate gas phase (ST
p); The horizontal position of described wood chip can be conditioned, to adjust the power of pointing to below in the column of chips in described boiling vessel, it is characterized in that:
With respect to multiple first technological parameters of the first special process adjuster, control to the input of described boiling vessel segmentation cellulosic material and boiling liquid; And
By being independent of the load governor of described process modulator, monitor the load on the container of described boiling vessel;
And described process modulator, with respect to first group of desired value in described process modulator, regulates pressure, the horizontal position of wood chip and the horizontal position of liquid in gas phase; And described load governor, with respect to second group of threshold value, is monitored the load in described boiling vessel; Compared with the control of related objective value being carried out with described process controller, the interaction of described second group of threshold value provides higher pressure load to the container of described boiling vessel; And in the time exceeding these threshold values, described load governor is independent of the adjusting that described process modulator is carried out, and affects at least one inflow or outflow to described boiling vessel, the net volume of liquid in described boiling vessel is reduced.
9. method according to claim 8, is characterized in that, the discharge of described current technique is the discharge (LIQ of boiling liquid
rET) and through the discharge (CH of the paper pulp of boiling
oUT), the influx of described related process is associated boiling liquid (ST, WL, DL) and wood chip (CH
iN) influx.
10. method according to claim 8 or claim 9, is characterized in that:
Described process modulator is carried out adjusting process with respect to the first object value of the horizontal position of described liquid and the top pressure of described boiling vessel, and the gross pressure wherein being provided on the container that current technological parameter is applied to described boiling vessel by the static height of the horizontal position of described liquid and the top pressure sum of described boiling vessel is loaded;
And described load governor has at least one threshold value of gross pressure load, at least one threshold value of described gross pressure load is limited by the predetermined fixed threshold of the pressure at least one predetermined fixed threshold and a gas phase of the horizontal position of liquid in described boiling vessel.
11. methods according to claim 8 or claim 9, is characterized in that:
In the time exceeding at least one threshold value, at least one liquid that the adjuster that described load governor utilization is independent of described process modulator cuts out described boiling vessel flows into.
12. methods according to claim 10, is characterized in that:
In the time exceeding at least one threshold value of described load governor, by being independent of the adjuster of described process modulator, a part for boiling liquid is deflected to described boiling vessel via the pipeline of controlling by the valve of normally closing.
13. methods according to claim 11, is characterized in that:
In the time exceeding at least one threshold value of described load governor, by being independent of the adjuster of described process modulator, a part for boiling liquid is deflected to described boiling vessel via the pipeline of controlling by the valve of normally 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 CN102449233A (en) | 2012-05-09 |
| CN102449233B true 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 (4)
| 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 |
| 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 |
Family Cites Families (8)
| 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 |
| US5401361A (en) * | 1992-08-19 | 1995-03-28 | Kamyr, Inc. | Completely coutercurrent cook continuous digester |
| WO1998035090A1 (en) * | 1997-02-09 | 1998-08-13 | Kvaerner Pulping Ab | Continuous method for producing pulp with spent liquor impregnation |
| SE526432C2 (en) * | 2002-07-03 | 2005-09-13 | Kvaerner Pulping Tech | Method and boiler for continuous boiling of raw material to cellulose pulp |
| SE0502626L (en) * | 2005-11-29 | 2007-05-29 | Metso Fiber Karlstad Ab | Method and apparatus for continuous boiling of chemical cellulose pulp |
| SE530744C2 (en) * | 2007-02-23 | 2008-09-02 | Metso Fiber Karlstad Ab | Steam phase boilers and a procedure for continuous boiling |
-
2009
- 2009-04-01 SE SE0950210A patent/SE533670C2/en not_active IP Right Cessation
-
2010
- 2010-03-30 BR BRPI1014045-0A patent/BRPI1014045B1/en not_active IP Right Cessation
- 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
Patent Citations (4)
| 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 |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| SE533670C2 (en) | 2010-11-30 |
| BRPI1014045A2 (en) | 2016-04-12 |
| RU2011144147A (en) | 2013-05-10 |
| WO2010114470A1 (en) | 2010-10-07 |
| SE0950210A1 (en) | 2010-10-02 |
| RU2503763C2 (en) | 2014-01-10 |
| BRPI1014045B1 (en) | 2019-06-04 |
| CN102449233A (en) | 2012-05-09 |
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