CN106758469B - A kind of the paper pulp reflux dilution system and its control method of middle-size and small-size slurry tower - Google Patents

A kind of the paper pulp reflux dilution system and its control method of middle-size and small-size slurry tower Download PDF

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CN106758469B
CN106758469B CN201611260179.XA CN201611260179A CN106758469B CN 106758469 B CN106758469 B CN 106758469B CN 201611260179 A CN201611260179 A CN 201611260179A CN 106758469 B CN106758469 B CN 106758469B
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slurry
tower
pulp
size
pipeline
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CN106758469A (en
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汤伟
胡祥满
佟永亮
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Dali Cailun Paper Co.,Ltd.
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Shaanxi University of Science and Technology
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/28—Tanks for storing or agitating pulp

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Abstract

The present invention a kind of the paper pulp reflux dilution system and its control method of middle-size and small-size slurry tower, wherein the system includes slurry tower, pulp branch road and pumpback pipeline；Described slurry tower bottom sets the propeller by propeller motor drag, is uniformly mixed for the paper pulp in the intensive pulp layer of lower floor；Slurry tower bottom side wall is connected provided with one outlet with the pulp pipeline in pulp branch road, and bottom sidewall is provided with the pumpback pipeline in another outlet connection pumpback pipeline；The pumpback pipeline also includes the ball float for floating on slurry surface in slurry tower, it is connected to the floating ball rod of ball float bottom and the pipe that is rigidly connected in turn, the Telescopic flexible pipe that is connected successively with the pipe that is rigidly connected, be rigidly connected head and the pumpback branch pipe that is arranged on the outside of slurry tower, and slurry recirculating pump and reflux line；The entrance of pipe of being rigidly connected is located in the sparse water layer in upper strata；Overfall pump intake, which connects back to, takes out branch pipe and pumpback pipeline, outlet connection reflux line；Reflux line end outlet is stretched into tower from top of tower perforate is starched.

Description

A kind of the paper pulp reflux dilution system and its control method of middle-size and small-size slurry tower
Technical field
The invention belongs to pulping and paper-making field, is related to a kind of pulp dilution method, more particularly to a kind of middle-size and small-size slurry tower Paper pulp reflux dilution system and its control method.
Background technology
In pulping and papermaking processes, the preparation storage of paper pulp and streaming are a necessary links, in pulp preparing process often Make it that paper pulp fiber is fully absorbed water swollen, the swollen time typically in more than 12h, in addition for highly concentrated or low dense kowtow slurry Pair etc. link often in electricity consumption slack hours section, therefore actual production demand is met, it is necessary to there are enough slurry deposits, i.e., Substantial amounts of pulp storage turns into a key issue, and traditional storage slurry equipment uses stock tank 1 as shown in Figure 1, such as in industry Common destroies forebay, general 5m of its height or so, using stock tank 1 its biggest advantage is that paper pulp is well mixed, the work(of propeller The relatively low but fatal weakness of the smaller then energy consumption of rate is that its capacity is small and floor space is big, this to present most high speed, It can not preferably meet production requirement again for the paper machine of high production capacity；Then exploitation devises as shown in Figure 2 on this basis Slurry tower 7, be up to more than 15m for large-scale slurry tower tower body, high below the 15m of tower body is middle-size and small-size slurry tower, and slurry tower capacity is big, takes up an area Area is small, and can effectively overcome the related vulnerability of traditional stock tank, but because the design feature for starching tower 7 also gives practical application band Drawback is carried out：It is high to starch tower 7 tower body so that by the paper pulp of swollen produced in slurry tower wadding it is poly- on lower leaf phenomenon, in figure on From light to dark, upper strata is sparse water layer to lower color, and lower floor is intensive pulp layer, and so as to starch, concentration is different above and below paper pulp in tower, centering Mainly influence paper pulp for small-sized slurry tower uniformly to mix, and lower floor's concentration is of a relatively high, propeller power when paper pulp mixing is pumped It is higher, also increase energy consumption.Therefore, preferably solve the drawbacks described above that slurry tower own characteristic is brought, play slurry tower well Advantage, have its significance to paper-making process and energy-saving grade.
The content of the invention
For problems of the prior art, the present invention provide a kind of middle-size and small-size slurry tower paper pulp reflux dilution system and Its control method, by using the own characteristic in slurry tower practical application, by mechanical device reasonable in design, efficiently against Practical difficulty caused by above-mentioned deficiency.
The present invention is to be achieved through the following technical solutions：
A kind of paper pulp reflux dilution system of middle-size and small-size slurry tower, including slurry tower, pulp branch road and pumpback pipeline；Described slurry Tower bottom sets the propeller by propeller motor drag, is uniformly mixed for the paper pulp in the intensive pulp layer of lower floor；Starch tower Bottom sidewall is connected provided with one outlet with the pulp pipeline in pulp branch road, and bottom sidewall is provided with another outlet and connects pumpback pipe Pumpback pipeline in road；The pumpback pipeline also includes the ball float for floating on slurry surface in slurry tower, is connected to ball float bottom in turn Floating ball rod and be rigidly connected pipe, the Telescopic flexible pipe connected successively with the pipe that is rigidly connected, being rigidly connected head and is arranged on slurry Pumpback branch pipe on the outside of tower, and slurry recirculating pump and reflux line；The entrance of pipe of being rigidly connected is located in the sparse water layer in upper strata；Overfall Pump intake connects pumpback branch pipe and pumpback pipeline, outlet connection reflux line；Reflux line end outlet starches top of tower perforate certainly Stretch into tower.
Preferably, floating ball rod, the pipe that is rigidly connected, Telescopic flexible pipe are integrally immersed in tower in paper pulp, and be rigidly connected head Starched through being arranged on tower tapered sidewalls.
Preferably, propeller is arranged on slurry tower bottom close to the outlet of connection pulp pipeline.
Preferably, described pulp branch road also includes the starching pump that entrance is connected on pulp pipeline, and starching pump discharge connects The stock line connect, the white water piping connected on pulp pipeline, flow control valve is provided with white water piping.
Further, in addition to control loop group, the concentration sensor being arranged on stock line vertical pipeline, and set Liquid level sensor on slurry tower；
Described control loop group includes,
According to the pulp density that concentration sensor gathers and setting value comparing result, control sets the paper pulp of flow control valve Concentration observing and controlling loop CIC-101；
According to the paper pulp liquid level that liquid level sensor detects and liquid level threshold value comparing result, slurry recirculating pump is carried out to stop control Slurry recirculating pump stops control loop PSC-101.
A kind of control method of the paper pulp reflux dilution system of middle-size and small-size slurry tower, based on control system of the present invention, Including,
Using pulp density as controlled parameter, detected and fed back by concentration sensor, measuring and controlling wood pulp concentration loop CIC- Controller in 101 is according to concentration Testing value C and setting value CSPDeviation control flow control valve action and change its aperture, adjust The step of saving the amount of plain boiled water and realizing pulp consistency control；
Slurry recirculating pump stops control loop PSC-101 and contrasted in fact according to the paper pulp liquid level that liquid level sensor detects and liquid level threshold value The step of existing slurry recirculating pump stops control.
Preferably, according to one liquid level threshold value L of parameter setting of slurry tower0, as the detected value L of liquid level sensor<L0When, return The controller that stock pump stops control loop PSC-101 makes slurry recirculating pump stop pumpback by frequency converter.
Compared with prior art, the present invention has technique effect beneficial below：
The present invention, which can effectively solve the problem that, starches the defects of tower is present in produce reality, solve because paper pulp is wadded a quilt with cotton in slurry tower The phenomenon of poly- upper lower leaf and caused by paper pulp mixing is uneven and the problem of some slurry kind pulp pumping difficulties；And the present invention The measure taken is very simple, device is simple, easily realization, cost is low；Invention utilizes paper pulp lamination defect, by sparse water layer Pulp layer mixed diluting intensive with bottom is simultaneously back to use, and technology difficulty and complexity are substantially reduced relative to other manner.
Brief description of the drawings
Fig. 1 is stock tank schematic device of the prior art.
Fig. 2 is slurry tower apparatus schematic diagram of the prior art.
Fig. 3 is the structural representation of the paper pulp reflux dilution system of the middle-size and small-size slurry tower of the present invention.
In figure, 1, stock tank；2nd, propeller；3rd, starching pump；4th, flow control valve；5th, stock line；6th, propeller motor；7、 Starch tower；8th, concentration sensor；9th, ball float；10th, floating ball rod；11st, be rigidly connected pipe；12nd, Telescopic flexible pipe；13rd, slurry recirculating pump； 14th, frequency converter；15th, pumpback pipeline；16th, white water piping；17th, pulp pipeline；18th, liquid level sensor；19th, be rigidly connected head；20、 Pumpback branch pipe；21st, reflux line.
Embodiment
With reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and It is not to limit.
Ball float 9 is floated on slurry surface in tower by a kind of paper pulp reflux dilution system of middle-size and small-size slurry tower of the present invention, the system, The top and bottom of floating ball rod 10 are connected to the surface of ball float 9 respectively and the upper port of pipe 11 that is rigidly connected, and be rigidly connected the lower port of pipe 11 Connect the arrival end of Telescopic flexible pipe 12, Telescopic flexible pipe 12 is rigidly connected first 19 with outside by starching on the tapered sidewalls of tower 7 Pumpback branch pipe 20 communicates, and is crossed with pumpback pipeline 15, and pumpback pipeline 15 connects the entrance of slurry recirculating pump 13, and the outlet of slurry recirculating pump 13 takes back Flow tube road 21, the end outlet of reflux line 21 are stretched into tower from the top drilling of tower 7 is starched；The floating ball rod being immersed in tower in paper pulp 10th, be rigidly connected pipe 11, Telescopic flexible pipe 12 can be moved integrally with the change of paper pulp liquid level by the floating support of ball float 9.The sparse water in upper strata Layer enters pumpback pipeline 15 through the pipe 11 that is rigidly connected, Telescopic flexible pipe 12, first 19, the pumpback branch pipe 20 that is rigidly connected, and from slurry The intensive pulp layer of lower floor of tower bottom crosses in pumpback pipeline 15 and enters slurry recirculating pump 13, after the mixed diluting of slurry recirculating pump 13, paper Slurry is pumped back into tower by reflux line 21 from the top of tower 7 is starched, while paper pulp enters pulp pipeline 17 by outlet at bottom, and with it is white The plain boiled water of waterpipe 16 enters stock line 5 through starching pump mixed diluting.Concentration observing and controlling loop according to the detected value of concentration sensor 8 with Set value calculation valve opening and adjust plain boiled water amount carry out concentration control, slurry recirculating pump stop control loop according to liquid level sensor 18 Detected value stops with liquid level threshold value control slurry recirculating pump 13.
Specifically, referring to Fig. 3, a kind of paper pulp reflux dilution system of middle-size and small-size slurry tower of the present invention, mainly include slurry tower 7th, propeller 2, starching pump 3, flow control valve 4, ball float 9, floating ball rod 10, the pipe 11 that is rigidly connected, Telescopic flexible pipe 12, overfall Pump 13, pumpback pipeline 15, stock line 5, white water piping 16, concentration sensor 8, frequency converter 14, liquid level sensor 18, rigidity connect 21, two joint 19, pumpback branch pipe 20, reflux line control loops.Propeller 2 is placed in the slurry bottom of tower 7 and dragged by propeller motor 6 It is dynamic, uniformly mixed for paper pulp；Starch the bottom of tower 7 and be provided with two outlets, one is connected with pumpback pipeline 15, secondly and grout outlet Road 17 connects, and starches on the tapered sidewalls of tower 7 perforate and equipped with being rigidly connected first 19, inner side termination Telescopic flexible pipe 12 exports, outside Termination pumpback branch pipe 20 is simultaneously connected to pumpback pipeline 15, and pumpback pipeline 15 connects the entrance of slurry recirculating pump 13, and the outlet of slurry recirculating pump 13 takes back Flow tube road 21, the end outlet of reflux line 21 are stretched into tower from the top drilling of tower 7 is starched.
Referring to Fig. 3, described paper pulp reflux dilution system, its pulp pipeline 17 connects the entrance of starching pump 3, and starching pump 3 goes out Mouth connection stock line 5, white water piping 16 are connected to pulp pipeline 17, plain boiled water is passed through starching pump with the paper pulp from slurry tower 7 Enter stock line 5 after 13 mixed dilutings.
Referring to Fig. 3, described paper pulp reflux dilution system, its surface of ball float 9 is secured to the upper end of floating ball rod 10, and ball float connects The lower end of bar 10 is connected with the upper port of pipe 11 that is rigidly connected, and ensures sufficiently large actual internal area, and the lower end of floating ball rod 10 is to firm The property upper port of connecting tube 11 will not cause to block；The lower port of pipe 11 that is rigidly connected connects the arrival end of Telescopic flexible pipe 12, scalable Flexible pipe 12 first 19 is communicated by starching being rigidly connected on the tapered sidewalls of tower 7 with outside pumpback branch pipe 20, and is connected to pumpback pipeline 15, the entrance of slurry recirculating pump 13 connection pumpback pipeline 15, this requires that all features form pumpback pipeline.In pumpback pipeline, it is floating Ball 9 floats on slurry surface in slurry tower 7, and floating ball rod 10, the pipe 11 that is rigidly connected, Telescopic flexible pipe 12 are overall to be immersed in paper pulp in tower In, the requirement of ball float 9 can be enough to float supporting ball link 10, the pipe 11 that is rigidly connected, Telescopic flexible pipe 12 in slurries, and can integrally with The change of paper pulp liquid level is moved by the floating support of ball float 9, and the sparse water layer in upper strata is by the pipe 11 that is rigidly connected, Telescopic flexible pipe 12, rigidity Connector 19, pumpback branch pipe 20 enter pumpback pipeline 15, with the intensive pulp layer of lower floor from slurry tower 7 bottom in pumpback pipeline 15 Cross, and enter slurry recirculating pump 13, after the mixed diluting of slurry recirculating pump 13, paper pulp is pumped back into by reflux line 21 from the top of tower 7 is starched In tower, the lift of pump should ensure that reflux dilution process smoothly completes.
Referring to Fig. 3, the control method of described paper pulp reflux dilution system, two control loop is respectively pulp density Observing and controlling loop CIC-101 and slurry recirculating pump stop control loop PSC-101, meet other control loops of production process requirement Within said feature.
Wherein measuring and controlling wood pulp concentration loop CIC-101 includes the concentration sensor being installed on the vertical pipeline of stock line 5 8th, the controller of concentration sensor 8 is connected and loaded on the flow control valve 4 on the vertical pipeline of white water piping 16, pulp density conduct Controlled parameter, is detected and is fed back by concentration sensor 8, controller is according to concentration Testing value C and setting value CSPDeviation control Flow control valve 4 acts and changes its aperture, adjusts the amount of plain boiled water and realizes the purpose of pulp consistency control.
Slurry recirculating pump stops control loop PSC-101 and realized according to the paper pulp liquid level that liquid level sensor 18 detects and liquid level threshold value The stopping control of slurry recirculating pump.Set a suitable liquid level threshold value L0, as the detected value L of liquid level sensor 18<L0When, controller Slurry recirculating pump 13 is set to be stopped by frequency converter 14.Such as the liquid level of slurry always high H is set, it is H/2 according to actual set liquid level threshold value, As detected value L<Slurry recirculating pump 13 stops during H/2, shows in real process, and the sparse water layer in upper strata is constantly mixed with the intensive pulp layer of lower floor Close and dilute and return in tower, constantly eliminating lamination tends to mix, while working as production process makes total liquid level be reduced to H/2, starches Sparse water layer is not present in tower, the substantially uniform distribution of paper pulp, eliminates the situation that can be only left sparse water layer using the later stage originally.

Claims (5)

  1. A kind of 1. control method of the paper pulp reflux dilution system of middle-size and small-size slurry tower, it is characterised in that
    The paper pulp reflux dilution system of the middle-size and small-size slurry tower includes slurry tower (7), pulp branch road and pumpback pipeline；
    Described slurry tower (7) bottom sets the propeller (2) dragged by propeller motor (6), in the intensive pulp layer of lower floor Paper pulp uniformly mixes；Slurry tower (7) bottom sidewall is connected provided with one outlet with the pulp pipeline (17) in pulp branch road, bottom Portion's side wall is provided with the pumpback pipeline (15) in another outlet connection pumpback pipeline；
    The pumpback pipeline also includes the ball float (9) for floating on slurry tower (7) interior slurry surface, is connected to ball float (9) bottom in turn Floating ball rod (10) and the pipe that is rigidly connected (11), the Telescopic flexible pipe (12) connected successively with the pipe that is rigidly connected (11), rigidity connect Joint (19) and the pumpback branch pipe (20) being arranged on the outside of slurry tower (7), and slurry recirculating pump (13) and reflux line (21)；Rigidity connects The entrance of adapter (11) is located in the sparse water layer in upper strata；Slurry recirculating pump (13) entrance connection pumpback branch pipe (20) and pumpback pipeline (15), outlet connection reflux line (21)；Reflux line (21) end outlet is starched tower (7) top drilling certainly and stretched into tower；
    Also include control loop group, the concentration sensor (8) being arranged on stock line (5) vertical pipeline, and it is arranged on slurry Liquid level sensor (18) on tower (7)；
    Described control loop group includes,
    According to the pulp density that concentration sensor (8) gathers and setting value comparing result, control sets the paper of flow control valve (4) Starch concentration observing and controlling loop CIC-101；
    According to the paper pulp liquid level that liquid level sensor (18) detects and liquid level threshold value comparing result, stopping control being carried out to slurry recirculating pump (13) The slurry recirculating pump of system stops control loop PSC-101；
    The control method includes,
    Using pulp density as controlled parameter, detect and feed back, measuring and controlling wood pulp concentration loop CIC- by concentration sensor (8) Controller in 101 is according to concentration Testing value C and setting value CSPDeviation control flow control valve (4) action and change it and open Degree, the step of adjusting the amount of plain boiled water and realize pulp consistency control；
    Slurry recirculating pump stops control loop PSC-101 and contrasted in fact according to the paper pulp liquid level that liquid level sensor (18) detects and liquid level threshold value The step of existing slurry recirculating pump stops control.
  2. 2. a kind of control method of the paper pulp reflux dilution system of middle-size and small-size slurry tower according to claim 1, its feature exist According to one liquid level threshold value L of parameter setting of slurry tower (7)0, as the detected value L of liquid level sensor (18)<L0When, slurry recirculating pump stops Only control loop PSC-101 controller makes slurry recirculating pump (13) stop pumpback by frequency converter (14).
  3. 3. a kind of control method of the paper pulp reflux dilution system of middle-size and small-size slurry tower according to claim 1, its feature exist In floating ball rod (10), the pipe that is rigidly connected (11), Telescopic flexible pipe (12) are integrally immersed in tower in paper pulp, and be rigidly connected head (19) run through and be arranged on slurry tower (7) tapered sidewalls.
  4. 4. a kind of control method of the paper pulp reflux dilution system of middle-size and small-size slurry tower according to claim 1, its feature exist In propeller (2) is arranged on slurry tower (7) bottom close to the outlet of connection pulp pipeline (17).
  5. 5. a kind of control method of the paper pulp reflux dilution system of middle-size and small-size slurry tower according to claim 1, its feature exist In described pulp branch road also includes the starching pump (3) that entrance is connected on pulp pipeline (17), starching pump (3) outlet connection Stock line (5), the white water piping (16) connected on pulp pipeline (17), white water piping is provided with flow control valve on (16) (4)。
CN201611260179.XA 2016-12-30 2016-12-30 A kind of the paper pulp reflux dilution system and its control method of middle-size and small-size slurry tower Active CN106758469B (en)

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US2107390A (en) * 1935-12-13 1938-02-08 John A Rosmait Apparatus for and method of agitating pulp stock
US3567573A (en) * 1968-09-25 1971-03-02 Bauer Bros Co Digester discharge system
CN201155068Y (en) * 2008-03-27 2008-11-26 中国轻工业长沙工程有限公司 Broke processing equipment at net part of paper-making machine
CN202099681U (en) * 2011-05-31 2012-01-04 重庆理文造纸有限公司 Backflow system of stock discharge box
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CN206538622U (en) * 2016-12-30 2017-10-03 陕西科技大学 A kind of paper pulp reflux dilution device of middle-size and small-size slurry tower

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