CN102220720B - Auxiliary vacuum unit of vacuum pulp washer and method for increasing vacuum degree - Google Patents
Auxiliary vacuum unit of vacuum pulp washer and method for increasing vacuum degree Download PDFInfo
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- CN102220720B CN102220720B CN201110149136A CN201110149136A CN102220720B CN 102220720 B CN102220720 B CN 102220720B CN 201110149136 A CN201110149136 A CN 201110149136A CN 201110149136 A CN201110149136 A CN 201110149136A CN 102220720 B CN102220720 B CN 102220720B
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Abstract
The invention relates to an auxiliary vacuum unit of a vacuum pulp washer and a method for increasing vacuum degree. The auxiliary vacuum unit comprises a first cyclone separator, a black liquor tank, a second cyclone separator, a high-level condenser and a vacuum pump, wherein the inlet of the first cyclone separator is connected with the upper part of a filtrate outlet of a vacuum pulp washer rotary drum; the gas outlet of the first cyclone separator is connected with the inlet of the second cyclone separator; the gas outlet of the second cyclone separator is connected with the high-level condenser; and the gas outlet of the high-level condenser is connected with the vacuum pump. The gas and a little entrained black liquor of a vacuum system is sequentially introduced to the first cyclone separator, the second cyclone separator, the high-level condenser and the vacuum pump, and the black liquor enters a black liquor system after separating. The auxiliary vacuum unit of the vacuum pulp washer and the method for increasing the vacuum degree are beneficial to increase of the vacuum degree of the vacuum system, and have the characteristics of low loss rate of the black liquor, low energy consumption, recyclable condensed water of the high-level condenser, and low discharge of waste water.
Description
Technical field
The invention belongs to the pulping and paper-making field, relate to a kind of in filter the device and the production method thereof of washing pulp, especially relate to a kind of in vacuum pulp washing machine washing pulp process the device and the method for using thereof of gas clean-up.
Background technology
Vacuum pulp washing machine is a kind of very common wash engine, and it is applicable to straw pulp, various slurries such as wood pulp.When using the vacuum pulp washing machine washing pulp, the size of wash engine vacuum is to influence slurry washing effect important factors.The generation of vacuum pulp washing machine vacuum has following two kinds of methods: 1, produce vacuum through the vacuum water leg, need vacuum pulp washing machine be installed in the place more than the 12m.2, aspirate through vavuum pump and produce vacuum, need in vacuum system, dispose equipment such as steam-water separator.Vacuum pulp washing machine is applicable to that the slurry water filtering performance is good, does not contain the situation of foam in the filtrating, can satisfy vacuum pulp washing machine to vacuum requirements like the vacuum pulp washing machine at bleachery through designing suitable water leg; But when being used to extract the higher straw pulp black liquor of viscosity; The vacuum of vacuum pulp washing machine is difficult to reach manufacturing technique requirent, and result of use is relatively poor, and extraction rate of black liquor is low, energy consumption is higher; The wastewater flow rate that externally discharges is many and pollutional load is high, is difficult to handle.
82～83 pages of " Chinese papermaking " 2009 the 28th the 10th phases of volume, " gas-liquid separator is at the mounting means of drum-type vacuum pulp washing machine assisted vacuum system " literary composition discloses the mounting means of several kinds of gas-liquid separators in drum-type vacuum pulp washing machine assisted vacuum system:
Mode 1: the top that gas-liquid separator rational in infrastructure is installed in water leg pipe; After getting into gas-liquid separator, the filtrating that wash engine is flowed out makes the top that escapes to separator on the gas-liquid through principles such as volume-expanding pressure-reducings; Then effectively aspirate gas-liquid mixture rapidly through the vacuum connecting leg; The gatherer of flowing through again carries out gas-liquid separation once more, cools off laggard people's vavuum pump through high-level condenser then.This mounting means ability vacuum system operational efficiency is high, also can reduce the loss of filtrating in a large number, improves the rate of recovery of medicine.Yet many vacuum pulp washing machine arranged in series of normal employing are installed gas-liquid separator on wash engine water leg pipe in the black liquid extraction process; With the layout that influences equipment; Because of on water leg pipe, setting up gas-liquid separator, reduced the effective depth of water leg pipe, reach desirable effect; Need to improve the setting height(from bottom) of vacuum pulp washing machine, increase investment; On wash engine water leg pipe, gas-liquid separator is installed; Black liquor receives the impact of volume-expanding pressure-reducing in the decline process; The black liquor system is prone to produce foam; Too much foam not only influences the operation of vacuum pulp washing machine, also has more black liquor and carries entering assisted vacuum device secretly, thereby increased the turnover rate of black liquor.
Mode 2: will force the filtrating of directly aspirating turbulent flow on the wash engine vertical water leg that is welded on communicating pipe of vacuum system, and rely on follow-up feeder to make gas-liquid separation through volume-expanding pressure-reducing.Carry out under the prerequisite that the gas-liquid that this mounting means is filtrated in water leg pipe does not have to separate; Vacuum efficiency is reduced; And make a large amount of black liquor flow to feeder, finally have a large amount of black liquor and be drawn into vavuum pump or high-level condenser and make filtrating loss, assisted vacuum DeGrain.
Mode 3: gas-liquid separator is installed in a side of vertical water leg, and the upside mouth directly is connected suction filtrating with the water leg, and the filtrating of suction is separated through the leg liquid/gas separator; The jet power of liquid thereby gravity and water leg falls in the water leg pipe; Water leg pipe connects vacuum pick-up system, though this mounting means is superior to mode 2:, also be under the prerequisite that does not reach the effective separation of leg liquid, to aspirate; Influence the operation of vacuum system and increase black liquor bleed, this mounting means is also unreasonable.
Mode 4: square gas-liquid separator is installed on the water leg, makes the top that escapes to separator on the gas-liquid, aspirate gas-liquid mixture quickly and effectively through very narrow connecting leg then through principles such as volume-expanding pressure-reducings.But the structure of this gas-liquid separator is not too reasonable, at first is that the bottom is taper, and flow resistance is big under the liquid; Next is the Lower Half that the upper accepting water leg does not insert in gas-liquid separator, is unfavorable for gas-liquid separation; The 3rd is the Lower Half that pump orifice is positioned on casing, does not meet gas-liquid separation suction principle, though be superior to mode 2 and 3:, effect is also not ideal enough.
Summary of the invention
On the one hand, technical problem to be solved by this invention provides a kind of vacuum pulp washing machine assisted vacuum device, and this device is easy to improve the vacuum of vacuum pulp washing machine; And the black liquor bleed rate is low; Energy consumption is low, and the condensed water of high-level condenser can be recycled, and reduces discharged waste water.
In order to solve the problems of the technologies described above; The present invention provides a kind of vacuum pulp washing machine assisted vacuum device; Its basic technical scheme is: comprise first cyclone separator, black liquor groove, second cyclone separator, high-level condenser, vavuum pump; The vacuum pulp washing machine filtrate (liquid links to each other with the black liquor groove through pipeline; The import that is positioned at first cyclone separator, one side links to each other with vacuum pulp washing machine rotary drum filtrate (liquid top through pipeline; The liquid outlet that is positioned at the first cyclone separator bottom links to each other, is positioned at the first cyclone separator top through pipeline and black liquor groove gas vent links to each other with the import that is positioned at second cyclone separator, one side through pipeline; The liquid outlet that is positioned at the second cyclone separator bottom links to each other, is positioned at the second cyclone separator top through pipeline and black liquor groove gas vent links to each other with the import that is positioned at the high-level condenser bottom through pipeline, and the gas vent that is positioned at high-level condenser top links to each other with vavuum pump through pipeline.
Further; Described vacuum pulp washing machine assisted vacuum device also comprises catch-all; The gas vent that is positioned at the second cyclone separator top links to each other with the import of catch-all through pipeline; The gas vent that is positioned at catch-all top links to each other with the import of high-level condenser through pipeline, and the liquid outlet that is positioned at the catch-all bottom links to each other with the black liquor groove through pipeline.
Preferably, said high-level condenser is a direct condenser.
On the other hand; The present invention provides a kind of method of utilizing aforementioned assisted vacuum device basic technical scheme gas clean-up; May further comprise the steps: in chemical pulp black liquid extraction process, the vacuum of keeping vacuum pulp washing machine is 0.02～0.035MPa, and paper pulp gets into vacuum pulp washing machine with 1.5%～2.5% concentration; Paper pulp after vacuum pulp washing machine filters is sent into subsequent processing, filters the black liquor that obtains and gets in the black liquor groove through vacuum pulp washing machine water leg pipe; The gas that is positioned at place, vacuum pulp washing machine rotary drum filtrate (liquid top gets into first cyclone separator with the black liquor of carrying secretly; Black liquor after first cyclone separator separates gets in the black liquor groove, and gas after the separation and the black liquor of carrying secretly get into second cyclone separator; Black liquor after second cyclone separator separates gets in the black liquor groove, and gas after the separation and the black liquor of carrying secretly get into high-level condenser; Behind high-level condenser, condensable gas is discharged after the high-level condenser condensation, and incoagulable gas gets into vavuum pump, enters atmosphere through vavuum pump, and holding vacuum pump import vacuum is 0.03～0.045MPa.
Further, gas after second cyclone separator separates and the black liquor of carrying secretly also get into catch-all; Black liquor after catch-all separates gets in the black liquor groove, and the gas after the separation gets into high-level condenser; Condensable gas is discharged after the high-level condenser condensation, and incoagulable gas gets into vavuum pump.
Preferably, said chemical pulp is a kraft reed pulp, and vacuum pulp washing machine vacuum is 0.02～0.025MPa, and the concentration that gets into vacuum pulp washing machine paper pulp is 1.5%～2.0%.
The invention has the beneficial effects as follows: vacuum pulp washing machine rotary drum filtrate (liquid top is not filtrating gathering generally; But be easy to the gathering of gas most; Thereby influence the vacuum of wash engine, and its gas be difficult for to discharge, can continue the vacuum of reduction vacuum pulp washing machine; The pipeline that links to each other with the assisted vacuum device is set on vacuum pulp washing machine rotary drum filtrate (liquid top, thereby helps the vacuum of the discharge raising system of gas most; The import of bleeding of assisted vacuum device is positioned at the top of vacuum pulp washing machine water leg pipe vacuum system; And its pipeline is convenient to aerial stretching, extension; Can significantly reduce the black liquor and the foam that get into the assisted vacuum system carries secretly; Reduce the inventory that gets into the assisted vacuum device, thereby reduce the loss of black liquor and the energy consumption of assisted vacuum device; Because of need not on water leg pipe, to set up gas-liquid separator; Avoided the assisted vacuum Unit Installation to existing vacuum system installation influence; Avoid vacuum pulp washing machine water leg pipe black liquor in the decline process, to receive the impact of volume-expanding pressure-reducing, reduced the foam generation of system; Series connection is provided with two cyclone separators; Can not only satisfy gas, liquid separation requirement under the ordinary production situation; When system broke down, after the two-stage gas-liquid separation, gas, liquid separated also to make the black liquor that gets into the assisted vacuum system carry out more completely; Thereby reduce the amount that black liquor gets into high-level condenser, reduce the loss of black liquor and the water consumption of high-level condenser.
Further set up catch-all in the improvement project, can further reduce the amount that black liquor gets into high-level condenser, improve the waste water cleannes of high-level condenser, be convenient to recycle, and reduce the water consumption and the waste water generation of high-level condenser.
Description of drawings
Fig. 1 is the structural representation of vacuum pulp washing machine assisted vacuum device.
Among the figure: 1 is that vacuum pulp washing machine, 2 is that first cyclone separator, 3 is that second cyclone separator, 4 is that catch-all, 5 is that high-level condenser, 6 is that vavuum pump, 7 is the black liquor groove.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail through embodiment.
In Fig. 1, vacuum pulp washing machine assisted vacuum device comprises first cyclone separator 2, black liquor groove 7, second cyclone separator 3, catch-all 4, high-level condenser 5, vavuum pump 6, and the filtrate (liquid of vacuum pulp washing machine 1 links to each other with black liquor groove 7 through pipeline; The import that is positioned at first cyclone separator, 2 one sides links to each other with vacuum pulp washing machine 1 rotary drum filtrate (liquid top through pipeline; The liquid outlet that is positioned at first cyclone separator, 2 bottoms through pipeline link to each other 7 with the black liquor groove, the gas vent that is positioned at first cyclone separator, 2 tops links to each other with the import that is positioned at second cyclone separator, 3 one sides through pipeline; The liquid outlet that is positioned at second cyclone separator, 3 bottoms links to each other, is positioned at second cyclone separator, 3 tops through pipeline and black liquor groove 7 gas vent links to each other with the import of catch-all 4 through pipeline; The gas vent that is positioned at catch-all 4 tops links to each other with the import of high-level condenser 5 through pipeline; The liquid outlet that is positioned at catch-all 4 bottoms links to each other with black liquor groove 7 through pipeline, and the gas vent that is positioned at high-level condenser top links to each other with vavuum pump through pipeline.Said high-level condenser 5 is a direct condenser, and direct condenser can be packed tower, ejector condenser etc.
Embodiment 1: at 100m
2Washing reed pulp vacuum pulp washing machine production line; The vacuum of keeping vacuum pulp washing machine 1 is 0.02MPa; Paper pulp gets into vacuum pulp washing machine 1 with 2.5% concentration, and the paper pulp after vacuum pulp washing machine 1 filters is sent into subsequent processing, filters the black liquor that obtains and gets in the black liquor groove 7 through the water leg pipe of vacuum pulp washing machine 1; The gas that is positioned at place, vacuum pulp washing machine 1 rotary drum filtrate (liquid top gets into first cyclone separator 2 with the black liquor of carrying secretly; Black liquor after first cyclone separator 2 separates gets in the black liquor groove 7, and gas after the separation and the black liquor of carrying secretly get into second cyclone separator 3; Black liquor after second cyclone separator 3 separates gets in the black liquor groove 7, and gas after the separation and the black liquor of carrying secretly get into catch-all 4; Black liquor after catch-all 4 separates gets in the black liquor groove 7, and the gas after the separation gets into high-level condenser 5; High-level condenser feeds clear water; Clear water directly contacts with the gas that gets into high-level condenser 5, and condensable gas forms waste water and discharges after high-level condenser 5 condensations, and incoagulable gas gets into vavuum pump 6; Enter atmosphere through vavuum pump 6, holding vacuum pump import vacuum is 0.03MPa.In the actual moving process, it is long-term because black liquor temperature is high to have solved first section vacuum pulp washing machine, does not have the problem of vacuum; Clean result is improved; Extraction rate of black liquor reaches more than 95%, than before using the present invention, uses the vavuum pump of a power as 90KW less simultaneously; Reduce energy consumption, per hour used clear water 25m less
3, reduced discharged waste water.
Embodiment 2: at 100m
2Washing reed pulp vacuum pulp washing machine production line; The vacuum of keeping vacuum pulp washing machine 1 is 0.035MPa; Paper pulp gets into vacuum pulp washing machine 1 with 1.5%% concentration; Paper pulp after vacuum pulp washing machine 1 filters is sent into subsequent processing, filters the black liquor that obtains and gets in the black liquor groove 7 through the water leg pipe of vacuum pulp washing machine 1; The gas that is positioned at place, vacuum pulp washing machine 1 rotary drum filtrate (liquid top gets into first cyclone separator 2 with the black liquor of carrying secretly; Black liquor after first cyclone separator 2 separates gets in the black liquor groove 7, and gas after the separation and the black liquor of carrying secretly get into second cyclone separator 3; Black liquor after second cyclone separator 3 separates gets in the black liquor groove 7, and gas after the separation and the black liquor of carrying secretly get into catch-all 4; Black liquor after catch-all 4 separates gets in the black liquor groove 7, and the gas after the separation gets into high-level condenser 5; High-level condenser feeds clear water; Clear water directly contacts with the gas that gets into high-level condenser 5, and condensable gas forms waste water and discharges after high-level condenser 5 condensations, and incoagulable gas gets into vavuum pump 6; Enter atmosphere through vavuum pump 6, holding vacuum pump import vacuum is 0.045MPa.In the actual moving process, it is long-term because black liquor temperature is high to have solved first section vacuum pulp washing machine, does not have the problem of vacuum; Clean result is improved; Extraction rate of black liquor reaches more than 95%, than before using the present invention, uses the vavuum pump of a power as 90KW less simultaneously; Reduce energy consumption, per hour used clear water 27m less
3, reduced discharged waste water.
Embodiment 3: at 100m
2Washing reed pulp vacuum pulp washing machine production line; The vacuum of keeping vacuum pulp washing machine 1 is 0.028MPa; Paper pulp gets into vacuum pulp washing machine 1 with 2.0% concentration; Paper pulp after vacuum pulp washing machine 1 filters is sent into subsequent processing, filters the black liquor that obtains and gets in the black liquor groove 7 through the water leg pipe of vacuum pulp washing machine 1; The gas that is positioned at place, vacuum pulp washing machine 1 rotary drum filtrate (liquid top gets into first cyclone separator 2 with the black liquor of carrying secretly; Black liquor after first cyclone separator 2 separates gets in the black liquor groove 7, and gas after the separation and the black liquor of carrying secretly get into second cyclone separator 3; Black liquor after second cyclone separator 3 separates gets in the black liquor groove 7, and gas after the separation and the black liquor of carrying secretly get into catch-all 4; Black liquor after catch-all 4 separates gets in the black liquor groove 7, and the gas after the separation gets into high-level condenser 5; High-level condenser feeds clear water; Clear water directly contacts with the gas that gets into high-level condenser 5, and condensable gas forms waste water and discharges after high-level condenser 5 condensations, and incoagulable gas gets into vavuum pump 6; Enter atmosphere through vavuum pump 6, holding vacuum pump import vacuum is 0.038MPa.In the actual moving process, it is long-term because black liquor temperature is high to have solved first section vacuum pulp washing machine, does not have the problem of vacuum; Clean result is improved; Extraction rate of black liquor reaches more than 95%, than before using the present invention, uses the vavuum pump of a power as 90KW less simultaneously; Reduce energy consumption, per hour used clear water 26m less
3, reduced discharged waste water.
Obviously, the invention is not restricted to the above specific embodiment, also can in the spirit of claim of the present invention and specification qualification, change other process conditions, have same technique effect, so do not repeat.Those of ordinary skill in the art can all methods direct from content disclosed by the invention or that associate reach the product that is obtained by this method, also belongs to protection scope of the present invention.
Claims (6)
1. vacuum pulp washing machine assisted vacuum device; Comprise first cyclone separator, black liquor groove, second cyclone separator, high-level condenser, vavuum pump; The vacuum pulp washing machine filtrate (liquid links to each other with the black liquor groove through pipeline; The liquid outlet that is positioned at the first cyclone separator bottom links to each other, is positioned at the first cyclone separator top through pipeline and black liquor groove gas vent links to each other with the import that is positioned at second cyclone separator, one side through pipeline; The liquid outlet that is positioned at the second cyclone separator bottom links to each other, is positioned at the second cyclone separator top through pipeline and black liquor groove gas vent links to each other with the import that is positioned at the high-level condenser bottom through pipeline; The gas vent that is positioned at high-level condenser top links to each other with vavuum pump through pipeline, it is characterized in that: the import that is positioned at first cyclone separator, one side links to each other with vacuum pulp washing machine rotary drum filtrate (liquid top through pipeline.
2. assisted vacuum device according to claim 1; It is characterized in that: also comprise catch-all; The gas vent that is positioned at the second cyclone separator top links to each other with the import of catch-all through pipeline; The gas vent that is positioned at catch-all top links to each other with the import of high-level condenser through pipeline, and the liquid outlet that is positioned at the catch-all bottom links to each other with the black liquor groove through pipeline.
3. assisted vacuum device according to claim 1 is characterized in that: said high-level condenser is a direct condenser.
4. method of using the said assisted vacuum device of claim 1 gas clean-up; It is characterized in that: in chemical pulp black liquid extraction process; Keeping vacuum pulp washing machine vacuum is 0.02～0.035MPa; Paper pulp gets into vacuum pulp washing machine with 1.5%～2.5% concentration, and the paper pulp after vacuum pulp washing machine filters is sent into subsequent processing, filters the black liquor that obtains and gets in the black liquor groove through vacuum pulp washing machine water leg pipe; The gas that is positioned at place, vacuum pulp washing machine rotary drum filtrate (liquid top gets into first cyclone separator with the black liquor of carrying secretly; Black liquor after first cyclone separator separates gets in the black liquor groove, and gas after the separation and the black liquor of carrying secretly get into second cyclone separator; Black liquor after second cyclone separator separates gets in the black liquor groove, and gas after the separation and the black liquor of carrying secretly get into high-level condenser; Condensable gas is discharged after the high-level condenser condensation, and incoagulable gas gets into vavuum pump, enters atmosphere through vavuum pump, and holding vacuum pump import vacuum is 0.03～0.045MPa.
5. the method for gas clean-up according to claim 4 is characterized in that: gas after second cyclone separator separates and the black liquor of carrying secretly also get into catch-all; Black liquor after catch-all separates gets in the black liquor groove, and the gas after the separation gets into high-level condenser; Condensable gas is discharged after the high-level condenser condensation, and incoagulable gas gets into vavuum pump.
6. according to the method for claim 4 or 5 described gas clean-ups, it is characterized in that: said chemical pulp is a kraft reed pulp, and vacuum pulp washing machine vacuum is 0.02～0.035MPa, and the concentration that gets into vacuum pulp washing machine paper pulp is 1.5%～2.5%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110149136A CN102220720B (en) | 2011-06-03 | 2011-06-03 | Auxiliary vacuum unit of vacuum pulp washer and method for increasing vacuum degree |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110149136A CN102220720B (en) | 2011-06-03 | 2011-06-03 | Auxiliary vacuum unit of vacuum pulp washer and method for increasing vacuum degree |
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| CN102220720A CN102220720A (en) | 2011-10-19 |
| CN102220720B true CN102220720B (en) | 2012-10-03 |
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| CN201110149136A Expired - Fee Related CN102220720B (en) | 2011-06-03 | 2011-06-03 | Auxiliary vacuum unit of vacuum pulp washer and method for increasing vacuum degree |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103103848A (en) * | 2012-12-14 | 2013-05-15 | 中冶美利纸业股份有限公司 | High-vacuum-degree pulp washer |
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