CN103774482B - Stablize medium consistency refining feed arrangement and the feed process thereof of refining strength - Google Patents
Stablize medium consistency refining feed arrangement and the feed process thereof of refining strength Download PDFInfo
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- CN103774482B CN103774482B CN201410035745.1A CN201410035745A CN103774482B CN 103774482 B CN103774482 B CN 103774482B CN 201410035745 A CN201410035745 A CN 201410035745A CN 103774482 B CN103774482 B CN 103774482B
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Abstract
The invention discloses medium consistency refining feed arrangement and the feed process thereof of stable refining strength.This device comprises flow control system, pulp-inlet pipe, separator tube and overflow pipe; The feed end of separator tube is connected with the discharging opening of middle underflow pump by pulp-inlet pipe, discharge end with in the charging aperture of dense disc mill be connected; The feed end of separator tube is the extension mouth that internal diameter changes from small to big, and the discharge end of separator tube is internal diameter contraction mouth from large to small, and the skew wall of the extension mouth of feed end and the angle of separator tube central shaft are 15 ° ~ 45 °; The skew wall of the contraction mouth of discharge end and the angle of separator tube central shaft are 15 ° ~ 45 °; The method by flow control system according in the operating power of dense disc mill and the pulp flow by disc mill that detects in real time, calculate real-time refining strength, the ratio controlling the refining strength of real-time refining strength and setting is 95 ~ 105%; The present invention ensures that disc mill is pulled an oar under stable refining strength, and obtains stable beating results.
Description
Technical field
The present invention relates to a kind of medium consistency refining feed arrangement, be specifically related to a kind of medium consistency refining feed arrangement and feed process thereof of stable refining strength, belong to the making beating technical field of pulping and paper-making.
Background technology
Mill district is formed between the movable grinding disc of the disc mill that making beating adopts and fixed millstone, the effect of the mechanical forces such as paper pulp fiber is squeezed by during mill district, shearing, fibre morphology changes and obtains required characteristic, with the requirement of paper performance meeting paper machine ru nnability and manufacture paper with pulp.Desirable pulping process is the process making fibrous raw material be subject to constant refining strength in pulping process, to obtain homogeneous, the stable paper pulp fiber of character, ensure the stable physical property of paper of manufacturing paper with pulp.When concentration one timing of paper pulp, refining strength depends on the power of disc mill motor in pulping process and the pulp flow by disc mill, if the power of disc mill and the flow of paper pulp all maintain in the excursion of the permission that sets in pulping process, or the power of disc mill motor and the ratio of pulp flow maintain in the excursion of the permission that sets, then can ensure that disc mill is pulled an oar under stable refining strength, and obtain stable beating results.
Medium consistency refining technology is the widely used making beating new technology in China paper mill in recent years, in dense disc mill in 6% ~ 12% time making beating of higher pulp density, the mobility of paper pulp is very poor at this concentration, and must use supportingly has the middle underflow pump of the auxiliary equipment such as vavuum pump and turbulator to carry.But in production application, in finding to adopt middle underflow pump conveying slurry to enter, dense disc mill also exists the pressure of paper pulp and the larger problem of flowed fluctuation, causes larger impact to the normal work of disc mill.Especially the working condition in producing is unstable, and when making the flow of paper pulp there is certain fluctuation, middle underflow pump is exaggerated this fluctuation.Therefore, dense disc mill in adopting middle underflow pump direct pumping paper pulp to enter, because the pulp pressure in disc mill mill district dense in passing through and flow all exist larger fluctuation, in dense disc mill cannot pull an oar under stable refining strength, refining process is difficult to control, defibrination quality and effect are unstable, thus have impact on pulp property and the physical property of paper of manufacturing paper with pulp.
Chinese invention patent application application number is 200910192224.6 provide a kind of voltage stabilization and current stabilization device for medium consistency refining charging, have adjusted to a certain extent middle underflow pump and in the pulsation of pulp pressure between dense disc mill and pulp flow.But the capacity of buffer is limited, and paper pulp is incompressible fluid, therefore still there is fluctuation to a certain degree through the pulp flow of buffer and pressure; Meanwhile, this application provide in the voltage stabilization and current stabilization device of medium consistency refining charging, buffer and in slurry control valve that pipeline between dense disc mill and pipeline are installed expand enter in the pressure of paper pulp before dense disc mill and the degree of flowed fluctuation.In addition, in medium consistency refining process, the power of disc mill also can fluctuate.These factors make paper pulp produce fluctuation by refining strength suffered during disc mill above, and affect the stability of beating results.
Summary of the invention
The object of the invention is to the shortcoming overcoming prior art, a kind of ensure medium consistency refining feed arrangement and feed process thereof that disc mill carries out the stable refining strength of pulling an oar under stable refining strength are provided.
Object of the present invention is achieved through the following technical solutions:
Stablize the medium consistency refining feed arrangement of refining strength, it is characterized in that comprising flow control system, pulp-inlet pipe, separator tube and overflow pipe; The feed end of described separator tube is connected with the discharging opening of middle underflow pump by pulp-inlet pipe, discharge end with in the charging aperture of dense disc mill be connected; Described overflow pipe is connected with the overfall on separator tube, the overfall on separator tube be arranged near feed end front 1/3 ?1/2 straight length tube wall on; In described, the discharging opening of dense disc mill is connected with grout outlet;
The feed end of described separator tube is the extension mouth that internal diameter changes from small to big, and the discharge end of separator tube is internal diameter contraction mouth from large to small, and the skew wall of the extension mouth of feed end and the angle of separator tube central shaft are 15 ° ~ 45 °; The skew wall of the contraction mouth of discharge end and the angle of separator tube central shaft are 15 ° ~ 45 °;
The internal diameter of described separator tube is 2.5 ~ 4 times of pulp-inlet pipe internal diameter, and 1.5 ~ 2.5 times of the internal diameter of the internal diameter of separator tube charging aperture of dense disc mill in being, the straight length axial length of separator tube is not less than 3 meters;
Described flow control system comprises flowmeter, enters to starch control valve, overflow control valve and Programmable Logic Controller; Flowmeter comprises first-class gauge, second gauge and the 3rd flowmeter; Described pulp-inlet pipe is provided with for regulate middle underflow pump export pulp flow enter to starch control valve, described overflow pipe is provided with the overflow control valve for regulating paper pulp spillway discharge; Described pulp-inlet pipe is provided with first-class gauge, overflow pipe is provided with second gauge, grout outlet is provided with the 3rd flowmeter, first-class gauge, second gauge are all connected with Programmable Logic Controller with the 3rd flowmeter; 3rd flowmeter is connected with first-class gauge.
For realizing the object of the invention further, preferably, the overfall on described separator tube is arranged on the tube wall of the straight length at distance feed end end face 1/3 place.The internal diameter of described pulp-inlet pipe is 125mm, and the internal diameter of separator tube is 400mm, in the internal diameter of charging aperture of dense disc mill be 200mm.Described enter to starch control valve and overflow control valve is manual modulation valve or is automatic regulating valve; When to enter to starch control valve and overflow control valve be automatic regulating valve, enter to starch control valve and be connected with Programmable Logic Controller respectively with overflow control valve.Described first-class gauge with enter to starch control valve and be connected; First-class gauge is also connected with second gauge, and second gauge is connected with overflow control valve.
The medium consistency refining feed process of the stable refining strength of application said apparatus, comprise following technique: according to fibrous raw material characteristic and the requirement of paper performance of manufacturing paper with pulp, refining strength value R0 in setting required for dense Disc Refiner Beating Process, again according in the rated power W0 of dense disc mill, determine, based on the paper pulp stream value Q0 of dense disc mill in the passing through of rated power W0, to make R0=W0/Q0;
By middle underflow pump, paper pulp is transported to separator tube through pulp-inlet pipe, in separator tube, the flow velocity of paper pulp declines, after the flow pulsation of paper pulp effectively weakens or eliminates, and dense disc mill in entering, in warp, the slurry of dense disc mill process exports from grout outlet;
In fill process, flow control system detects the pulp flow Qin of middle underflow pump output in real time by the flowmeter on pulp-inlet pipe, detect the pulp flow Qout by disc mill in real time by the flowmeter on grout outlet, detected the pulp flow Qy overflowed from overflow pipe by the flowmeter on overflow pipe in real time; Then controlled the aperture of slurry-inlet valve door and flow spill valve by flow control system, pulp flow Q0 large 10% that the pulp flow Qin that in fill process, middle underflow pump exports is set than disc mill or more, thus make in overflow pipe, have paper pulp to overflow all the time;
Flow control system according in the operating power W of dense disc mill and the pulp flow Qout by disc mill that detects in real time, calculate real-time refining strength R=W/Qout, ratio R/the R0 controlling the refining strength of real-time refining strength and setting is 95 ~ 105%, as the ratio R/R0<95% of the refining strength of real-time refining strength and setting, the aperture of flow spill valve is strengthened by flow control system, increase the pulp flow Qy by overflow pipe, be reduced by the pulp flow Qout of disc mill; As the ratio R/R0>105% of the refining strength of real-time refining strength and setting, reduced the aperture of flow spill valve by flow control system, be reduced by the pulp flow Qy of overflow pipe, increase the pulp flow Qout by disc mill; Ratio R/the R0 of the refining strength of real-time refining strength and setting is finally made to be 95 ~ 105%.
Compared with prior art, the present invention has the following advantages:
1, the present invention detected in real time by flow control system, controlling water kick amount and the pulp flow in dense disc mill mill district in passing through, the pulp beating power of disc mill is made to maintain in the excursion of the permission that sets with the ratio of the pulp flow by grinding district, ensure that disc mill is pulled an oar under stable refining strength, and obtain stable beating results.
2, the present invention by arrange with in the separator tube that is directly connected of dense disc mill charging aperture and the overfall be connected with overflow pipe is set on separator tube, the pressure of the paper pulp after by separator tube and flow pulsation are reduced greatly, effectively reduces the pressure of the paper pulp of dense disc mill in entering and the fluctuation of flow;
3, the present invention is by flow control system setting, the flow regulating paper pulp in pulp-inlet pipe, grout outlet and overflow pipe, while guarantee disc mill carries out pulling an oar and obtains stable beating results under stable refining strength, decrease the frequency that middle underflow pump outlet valve regulates, middle underflow pump is run under stable flow, and effectively reduces the pulsation of pulp flow and pressure.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that the medium consistency refining feed arrangement of this stable refining strength is installed in medium consistency refining system.
Fig. 2 is the structural representation of the separator tube in Fig. 1.
Detailed description of the invention
For understanding the present invention better, below in conjunction with accompanying drawing, the present invention is described further, but embodiments of the present invention are not limited thereto.
As shown in Figure 1, 2, a kind of medium consistency refining feed arrangement of stable refining strength, comprises flow control system, pulp-inlet pipe 2, separator tube 3 and overflow pipe 4; The feed end 3 of described separator tube 3 ?1 to be connected with the discharging opening of middle underflow pump 1 by pulp-inlet pipe 2, the discharge end of separator tube 33 ?2 with in the charging aperture of dense disc mill 5 be connected; Described overflow pipe 4 and the overfall 3 on separator tube 3 ?3 to be connected; In described, the discharging opening of dense disc mill 5 is connected with grout outlet 6;
The feed end 3 of separator tube 3 ?1 extension mouth changed from small to big for internal diameter, the discharge end 3 of separator tube 3 ?2 be internal diameter contraction mouth from large to small; The skew wall of the extension mouth of described feed end 3 ?1 and the included angle A of separator tube 3 central shaft are 15 ° ~ 45 °, as selected 45 °; The skew wall of the contraction mouth of discharge end 3 ?2 and the included angle B of separator tube 3 central shaft are 15 ° ~ 45 °, as selected 30 °; The internal diameter of separator tube 3 is 2.5 ~ 4 times of pulp-inlet pipe 2 internal diameter, and 1.5 ~ 2.5 times of the internal diameter of the internal diameter of separator tube 3 charging aperture of dense disc mill 5 in being, the straight length of separator tube 3 do not comprise feed end 3 ?1 and discharge end 3 ?2 axial length be not less than 3 meters, the pressure of the paper pulp after by separator tube and flow pulsation are reduced greatly, effectively reduces the pressure of the paper pulp of dense disc mill in entering and the fluctuation of flow; As pulp-inlet pipe 2 internal diameter can be selected to be 125mm, the internal diameter of separator tube 3 is 400mm, in the internal diameter of charging aperture of dense disc mill 5 be 200mm, the axial length that the straight length of separator tube 3 does not comprise feed end 3 ?1 and discharge end 3 ?2 is 3 meters.The discharge end 3 of separator tube ?2 directly with in the charging aperture of dense disc mill 5 be connected.
The pressure exported from middle underflow pump and the larger paper pulp of flowed fluctuation enter separator tube through pulp-inlet pipe, and the internal diameter due to separator tube 3 is 2.5 ~ 4 times of pulp-inlet pipe 2 internal diameter, and in separator tube, paper pulp flow velocity declines, and flow and the pressure fluctuation of paper pulp decline greatly; Flow control system makes have paper pulp to overflow in overflow pipe all the time, some paper pulp is gone out by overflow pipe overflow, greatly reduce the frequency that middle underflow pump outlet valve regulates, middle underflow pump is run under comparatively stable working condition, decrease and frequent regulate middle underflow pump outlet valve and the pulsation of the pressure that increases and flow, the pressure of the paper pulp after by separator tube and flow pulsation are reduced greatly, effectively reduces the pressure of the paper pulp of dense disc mill in entering and the fluctuation of flow.Described feed end 3 ?1 the skew wall of extension mouth and the included angle A of separator tube 3 central shaft be 15 ° ~ 45 ° and discharge end 3 ?2 the skew wall of contraction mouth and the included angle B of separator tube 3 central shaft be 15 ° ~ 45 ° ensure that paper pulp continous-stable enter and export separator tube and unduly increase feed end 3 ?1 and discharge end 3 ?2 length.
Overfall on separator tube 33 ?3 be arranged near feed end 3 ?1 front 1/3 ?1/2 straight length tube wall on; As the overfall 3 on separator tube 3 ?3 be arranged on distance feed end 3 ?1 end face 800mm straight length tube wall on (for separator tube distance feed end 1/3 place), overfall internal diameter is 125mm.
Pulp-inlet pipe 2 is provided with for regulate middle underflow pump export pulp flow enter to starch control valve 7, described overflow pipe 4 is provided with the overflow control valve 8 for regulating paper pulp spillway discharge;
Flow control system comprises flowmeter, enters to starch control valve 7, overflow control valve 8 and Programmable Logic Controller (PLC); Flowmeter is connected with Programmable Logic Controller; Flowmeter comprises first-class gauge 9, second gauge 10 and the 3rd flowmeter 11; Enter to starch control valve 7 and overflow control valve 8 for manual modulation valve or be automatic regulating valve.When entering to starch control valve 7 and overflow control valve 8 for automatic regulating valve, be connected with Programmable Logic Controller respectively; Pulp-inlet pipe 2 is provided with first-class gauge 9, overflow pipe 4 is provided with second gauge 10, grout outlet 6 is provided with the 3rd flowmeter 11, first-class gauge 9, second gauge 10 are all connected with Programmable Logic Controller with the 3rd flowmeter 11; The flow of paper pulp in flow control system setting, in real time detection, control and regulation pulp-inlet pipe, grout outlet and overflow pipe, the pulp beating power of disc mill is made to maintain in the excursion of the permission that sets with the ratio of the pulp flow by grinding district, make in overflow pipe, have paper pulp to overflow all the time, ensure that disc mill is pulled an oar under stable refining strength, and obtain stable beating results.3rd flowmeter 11 is connected with first-class gauge 9, first-class gauge 9 with enter to starch control valve 7 and be connected, first-class gauge 9 controls the aperture (Data Control according to first-class gauge) into slurry control valve 7; First-class gauge 9 is also connected with second gauge 10, and second gauge 10 is connected with overflow control valve 8, the aperture (Data Control according to second gauge) of second gauge 10 controlling water kick control valve 8; 3rd flowmeter 11 shows the flow of grout outlet 6.
The medium consistency refining feed process of this stable refining strength, comprises following technique:
According to fibrous raw material characteristic and the requirement of paper performance of manufacturing paper with pulp, refining strength value R0(in setting required for dense Disc Refiner Beating Process is as got R0=42kWh/t), again according in the rated power W0(of dense disc mill as desirable W0=132kW), calculate, setting one based on dense disc mill in the passing through of rated power W0 paper pulp stream value Q0(as desirable=3.14t slurry/hour), make R0=W0/Q0;
The waste and old boxboard paper pulp of the secondary stock U.S. being 9 ± 1% by concentration by middle underflow pump is transported to separator tube 3 through pulp-inlet pipe 2, in separator tube 3, the flow velocity of paper pulp declines, after the flow pulsation of paper pulp effectively weakens or eliminates, dense disc mill 5 in entering, the slurry that in warp, dense disc mill 5 processes exports from grout outlet 6;
In fill process, flow control system detects the pulp flow Qin of middle underflow pump output in real time by the first-class gauge 9 on pulp-inlet pipe 2, detect the pulp flow Qout by disc mill in real time by the 3rd flowmeter 11 on grout outlet, detected the pulp flow Qy overflowed from overflow pipe by the second gauge 10 on overflow pipe in real time;
The aperture into slurry control valve 7 and overflow control valve 8 is controlled by flow control system, make the pulp flow Qin that in fill process, middle underflow pump exports be 110 ~ 115% of the pulp flow Q0 by disc mill of setting, thus make in overflow pipe, have paper pulp to overflow all the time.
Then, flow control system according in the operating power W of dense disc mill and the pulp flow Qout by disc mill that detects in real time, calculate real-time refining strength R=W/Qout, ratio R/the R0 controlling the refining strength of real-time refining strength and setting is 95 ~ 105%, as the ratio R/R0<95% of the refining strength of real-time refining strength and setting, the aperture of flow spill valve is strengthened by flow control system, increase the pulp flow Qy by overflow pipe, thus be reduced by the pulp flow Qout of disc mill; As the ratio R/R0>105% of the refining strength of real-time refining strength and setting, reduced the aperture of flow spill valve by flow control system, be reduced by the pulp flow Qy of overflow pipe, thus increase the pulp flow Qout by disc mill; By above adjustment, the ratio R/R0 finally making the refining strength of real-time refining strength and setting is 95 ~ 105%, reaches the object of stable refining strength.
Claims (5)
1. stablize the medium consistency refining feed arrangement of refining strength, it is characterized in that comprising flow control system, pulp-inlet pipe, separator tube and overflow pipe; The feed end of described separator tube is connected with the discharging opening of middle underflow pump by pulp-inlet pipe, discharge end with in the charging aperture of dense disc mill be connected; Described overflow pipe is connected with the overfall on separator tube, the overfall on separator tube be arranged near feed end front 1/3 ?1/2 straight length tube wall on; In described, the discharging opening of dense disc mill is connected with grout outlet;
The feed end of described separator tube is the extension mouth that internal diameter changes from small to big, and the discharge end of separator tube is internal diameter contraction mouth from large to small, and the skew wall of the extension mouth of feed end and the angle of separator tube central shaft are 15 ° ~ 45 °; The skew wall of the contraction mouth of discharge end and the angle of separator tube central shaft are 15 ° ~ 45 °;
The internal diameter of described separator tube is 2.5 ~ 4 times of pulp-inlet pipe internal diameter, and 1.5 ~ 2.5 times of the internal diameter of the internal diameter of separator tube charging aperture of dense disc mill in being, the straight length axial length of separator tube is not less than 3 meters;
Described flow control system comprises flowmeter, enters to starch control valve, overflow control valve and Programmable Logic Controller; Flowmeter comprises first-class gauge, second gauge and the 3rd flowmeter; Described pulp-inlet pipe is provided with for regulate middle underflow pump export pulp flow enter to starch control valve, described overflow pipe is provided with the overflow control valve for regulating paper pulp spillway discharge; Described pulp-inlet pipe is provided with first-class gauge, overflow pipe is provided with second gauge, grout outlet is provided with the 3rd flowmeter, first-class gauge, second gauge are all connected with Programmable Logic Controller with the 3rd flowmeter; 3rd flowmeter is connected with first-class gauge;
Described first-class gauge with enter to starch control valve and be connected; First-class gauge is also connected with second gauge, and second gauge is connected with overflow control valve.
2. the medium consistency refining feed arrangement of stable refining strength according to claim 1, is characterized in that: the overfall on described separator tube is arranged on the tube wall of the straight length at distance feed end end face 1/3 place.
3. the medium consistency refining feed arrangement of stable refining strength according to claim 1, is characterized in that: the internal diameter of described pulp-inlet pipe is 125mm, and the internal diameter of separator tube is 400mm, in the internal diameter of charging aperture of dense disc mill be 200mm.
4. the medium consistency refining feed arrangement of stable refining strength according to claim 1, is characterized in that: described enter to starch control valve and overflow control valve is manual modulation valve or is automatic regulating valve; When to enter to starch control valve and overflow control valve be automatic regulating valve, enter to starch control valve and be connected with Programmable Logic Controller respectively with overflow control valve.
5. application rights require 1 ?the medium consistency refining feed process of stable refining strength of device described in 4 any one, it is characterized in that comprising following technique: according to fibrous raw material characteristic and the requirement of paper performance of manufacturing paper with pulp, refining strength value R0 in setting required for dense Disc Refiner Beating Process, again according in the rated power W0 of dense disc mill, determine, based on the paper pulp stream value Q0 of dense disc mill in the passing through of rated power W0, to make R0=W0/Q0;
By middle underflow pump, paper pulp is transported to separator tube through pulp-inlet pipe, in separator tube, the flow velocity of paper pulp declines, after the flow pulsation of paper pulp effectively weakens or eliminates, and dense disc mill in entering, in warp, the slurry of dense disc mill process exports from grout outlet;
In fill process, flow control system detects the pulp flow Qin of middle underflow pump output in real time by the flowmeter on pulp-inlet pipe, detect the pulp flow Qout by disc mill in real time by the flowmeter on grout outlet, detected the pulp flow Qy overflowed from overflow pipe by the flowmeter on overflow pipe in real time; Then controlled the aperture of slurry-inlet valve door and flow spill valve by flow control system, pulp flow Q0 large 10% that the pulp flow Qin that in fill process, middle underflow pump exports is set than disc mill or more, thus make in overflow pipe, have paper pulp to overflow all the time;
Flow control system according in the operating power W of dense disc mill and the pulp flow Qout by disc mill that detects in real time, calculate real-time refining strength R=W/Qout, ratio R/the R0 controlling the refining strength of real-time refining strength and setting is 95 ~ 105%, as the ratio R/R0<95% of the refining strength of real-time refining strength and setting, the aperture of flow spill valve is strengthened by flow control system, increase the pulp flow Qy by overflow pipe, be reduced by the pulp flow Qout of disc mill; As the ratio R/R0>105% of the refining strength of real-time refining strength and setting, reduced the aperture of flow spill valve by flow control system, be reduced by the pulp flow Qy of overflow pipe, increase the pulp flow Qout by disc mill; Ratio R/the R0 of the refining strength of real-time refining strength and setting is finally made to be 95 ~ 105%.
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| FI115540B (en) * | 2000-12-29 | 2005-05-31 | Metso Paper Inc | Apparatus for introducing pulp into a headbox of a paper machine or the like |
| CN2784442Y (en) * | 2004-11-30 | 2006-05-31 | 华南理工大学 | Pressure stabilizer for beating of disk refiner |
| CN101654885B (en) * | 2009-09-11 | 2012-06-27 | 华南理工大学 | Voltage and current stabilizing device for medium consistency pulping feedstock |
| CN101705633A (en) * | 2009-10-30 | 2010-05-12 | 华南理工大学 | Device for controlling pulping process and control method thereof |
| CN202298332U (en) * | 2011-09-29 | 2012-07-04 | 华南理工大学 | A pulp feed device for medium consistency refining |
| CN203715986U (en) * | 2014-01-24 | 2014-07-16 | 华南理工大学 | Intermediate concentration pulping and feeding device with stable pulping strength |
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