CN2255448Y

CN2255448Y - Looped-network replaceable squeezing wash engine

Info

Publication number: CN2255448Y
Application number: CN 95227482
Authority: CN
Inventors: 王锡元
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-11-30
Filing date: 1995-11-30
Publication date: 1997-06-04
Anticipated expiration: 2005-11-30

Abstract

The utility model discloses equipment used for washing papermaking coarse pulp. The utility model comprises a rotary drum installed on a supporting wheel, a net cage installed in a pulp inlet tank of a machine casing, a belt-type correcting roller wrapped on the net cage and the rotary drum, a tensioning roller, and an endless filtering net of a turning roll. The inner part and the outer part of the rotary drum are respectively provided with an inner wash liquid tank and an outer wash liquid tank; the end part of the machine casing is provided with a pipeline which can make the section of the inner wash liquid tank communicated with the section of the outer wash liquid tank corresponding to the section of the inner wash liquid tank. The rotary drum and the machine casing are also provided with a vacuum section, a compressed-air section, a scraper and a spray pipe. The utility model can realize the purpose that the utility model can carry out double-face filtration, multisection counterflow displacement, and vacuum type squeezing and dewatering operation for pulp in one piece of equipment. The utility model has the advantages of high extracting rate of black liquid, electricity saving and water saving.

Description

Looped network displacement squeezing wash engine

The utility model relates to the equipment that is used to wash thick slurry in a kind of papermaking and extracts black liquor.The continuous displacement bleaching that also can be used as paper making pulp is perhaps as other industry, as chemical industry, pharmacy, the contour cleanliness washing in mine or dry equipment.

The DD type drum-type displacement washer that the existing equipment that is used for thick slurry of papermaking washing and extraction black liquor can be produced from the Finland AHLSTROM company that Fig. 2 represents be seen, it contains a rotary drum 5 that is installed in the casing 15, be with filter opening on the rotatory drum wall, and have circumferentially uniform axial ribs 24 on its outer round surface; Rib makes rotary drum space of circles outside it form one group of cell, and a fixedly filter plate 23 is installed in each cell, and cell is divided into inside and outside two parts, i.e. the outer slurry chamber of filtrate chamber in the filter plate and filter plate; A dispensing head 25 that is fixed on the casing is housed in the rotary drum, has airtight section I, III, V, VII, IX, X, XI mutually on the dispensing head; Have the stock inlet 27 of thick slurry and the grout outlet 28 of clean slurry on the casing 15, the rotary drum peripheral space is divided into section 0, II, IV, VI, VIII, XII by six fixing on casing inner wall dividing plates 26, this section is not connected, but by the pipeline of casing end section IX-VI, VII-IV, V one II is communicated with; Have among the section III in black liquid outlet pipe, the section VIII washing lotion tube is housed, the band vaccum suction pipe is equipped with the compressed air blowpipe in the section X in the section XI.Slightly starch under pressure from pulp-inlet pipe 27 and enter section 0 in the casing, after filtering on the filter plate 23 of rotary drum, promptly be separated into underflow and black liquor, and slurry cell and the interior filtrate cell of section I in the section 0 have been full of respectively, after this along with the clockwise direction of rotary drum is rotated, the black liquor that remains in the slurry cell underflow is washed the water displacement piecemeal by section, being washings enters IX by VIII after to slurry washing, enter VI at this by casing end pipeline, then again to slurry washing and enter VII, enter IV by pipeline, in III, obtain the denseest black liquor in this way, come out to starch only at XII, realized the multistage counter current displacement of washings with slurry; Section X and XI are used for slurry is aspirated, blows off.The shortcoming of this wash engine is: 1) the slurry layer only accumulates on the filter plate by the only pressure of thick slurry itself, so its concentration is lower, thickness is irregular, washings often pass through from thin slurry layer, and thicker slurry layer will can not get washing, that is to say that clean result is relatively poor; 2) washings that accumulate in the filtrate chamber produce backflow with the motion of rotary drum, thereby have reduced the effect of multistage counter current washing, and have increased the energy consumption and the water consumption of pumping washings.

The purpose of this utility model is to overcome the shortcoming that exists in the above-mentioned prior art, provide that a kind of clean result is good, extraction rate of black liquor is high, and the looped network of economize on electricity, water-saving displacement squeezing wash engine, and make it have compact conformation, easy and simple to handle, characteristics such as production capacity is big.

Looped network displacement squeezing wash engine includes the rotary drum of a cornice filter opening and one and has the into casing of stock tank and slurry outlet groove, a wash-in liquid bath that includes one group of disconnected section each other that circumferentially distributes has been installed on the casing at place in the rotary drum madial wall, on the casing at the outer exterior wall place of rotary drum the washout liquid bath has been installed, the washout liquid bath includes one group of corresponding and mutual each other disconnected section of the circumferential position with each section of wash-in liquid bath, and the end of casing has one group of pipeline that the last section in each section in wash-in liquid bath washout liquid bath opposite with the drum rotating direction is connected, the wash-in liquid bath has connected the black liquid outlet pipe on the section that closely enters the stock tank place, the washout liquid bath has connected the washings inlet tube on the section at nearly slurry outlet groove place, have section that is communicated with vaccum suction pipe and the section that is communicated with the compressed air blowpipe in the rotary drum inboard at slurry outlet groove place; Characteristics of the present utility model are: 1) rotary drum be installed in one group casing into and out of having on the support roller of importing power between the stock tank, and a side of rotary drum stretches into in the stock tank; 2) advance the cylinder mould of the annulus cylindricality that a cornice filter opening has been installed in the stock tank; 3) envelope wall of cylinder mould in advancing stock tank, and surround filter screen for no reason on the wall beyond the support roller supporting area of rotary drum again simultaneously; 4) one group is used for supporting, guiding, the tensioning of filter screen and the corrector roll that turns to, idler roller, slewing rollers; 5) one group of high pressure water jet pipe that is used to clean filter screen is housed on casing.

The utility model wash engine also can have been installed a cover on the bearing block of slewing rollers can make slewing rollers press to the elasticity pressue device of filter screen, drum surface.The utility model wash engine, its rotary drum are equipped with a stripping slurry scraper on the casing at nearly slurry outlet groove place.

To and contrast accompanying drawing by embodiment below, the utility model will be further described below.Have in the accompanying drawing:

Fig. 1 be the utility model looped network displacement squeezing wash engine just cut open schematic diagram;

Fig. 2 be DD type drum-type displacement washer of the prior art just cut open schematic diagram.

See that from Fig. 1 looped network displacement squeezing wash engine includes the rotary drum 5 of a cornice filter opening and one and has the into casing 15 of stock tank 16 and slurry outlet groove 17.A wash-in liquid bath 7 has been installed on the casing at rotary drum madial wall place, and the wash-in liquid bath is separated into section I, III, V, the VII that is not connected to each other by dividing plate; On the casing at rotary drum outer exterior wall place washout liquid bath 6 has been installed, this groove is separated into not connected to each other section II, IV, VI, VIII with dividing plate; And the circumferential position of each section is corresponding with each section position of wash-in liquid bath; III in the wash-in liquid bath, V, VII are communicated with the II in the washout liquid bath, IV, VI respectively by the pipeline (failing among the figure to represent) that has on the casing end, and in the section VIII of the section I of wash-in liquid bath and washout liquid bath, be provided with black liquid outlet pipe and washings inlet tube (fail among the figure expression) respectively; Near grout outlet rotary drum inboard has section IX that is communicated with vaccum suction pipe and the section X that is communicated with the compressed air blowpipe.Rotary drum is by one group of support roller 9 supporting of its bottom, and support roller is installed in on the casing between the stock tank and slurry outlet groove, and one of them support roller is connected with transmission device (not giving expression among the figure), so that rotary drum is pressed the arrow among Fig. 1, i.e. and clockwise direction rotation.

The wall of cylinder mould 2 has filter opening, and is the annulus cylindricality, and its most surfaces is embedded in in the stock tank; Filter screen 4 is the enclosed type nets of (being that two ends overlap into one) for no reason, its envelope the ABC wall of cylinder mould, surround simultaneously the CDE wall of rotary drum 5 again; Filter screen by corrector roll 8, idler roller 14, slewing rollers 11 to it support, guiding, tensioning and turn to, corrector roll and idler roller all can make axle adjust moving of filter screen by the arrow on Fig. 1 central roll center line.At the network segment that returns of filter screen, promptly the filter screen section of the later nothing slurry layer of slewing rollers has been installed two groups of high pressure water jet pipes 12 by casing.

One cover can be installed on the bearing block of slewing rollers 11 can make slewing rollers press to the elastic pressuring clamping device of filter screen, drum surface (failing among the figure to represent), so that the slurry layer is implemented an extrusion dehydration.The position of slewing rollers is arranged in the section IX at vaccum suction pipe place.Scraper 10 is used to make the slurry layer to peel off from filter screen, after its position is arranged on the section X at compressed air blowpipe place.

The thick slurry of band pressure enters into stock tank 16, leans on the minute-pressure of thick slurry itself to form the slurry layer on the ABC of cylinder mould 2 face; When support roller 9 input power drive rotary drums 5 were done the clockwise direction rotation, cylinder mould was done rotation counterclockwise under the pining down of filter screen 4.At this moment the thick slurry layer on the cylinder mould is entrained between filter screen and the rotary drum, and move clockwise with filter screen, rotary drum, together from the washings antikinesis in the washout liquid bath VIII section, washings wash the slurry layer by the filter opening of filter screen from section VIII, enter the section VII of wash-in liquid bath again through the filter opening of rotary drum, from the pipeline arrival section VI of VII by chassis end; Equally, the washings in the VI section enter V and change section IV over to by pipeline after the slurry layer is washed; After this repeat above-mentioned process detergent milk layer piecemeal successively again, arrive section II at last, after to the washing of the slurry layer between the section II-I, I obtains the denseest black liquor from section, and from the black liquid outlet pipe, flow out, and on section VIII, obtain the cleanest pulp layer.Clean slurry blows pine by the compressed air on the section X again by the vacuum draw dehydration of section IX and the extrusion dehydration on the slewing rollers 11, peels off and fall into slurry outlet groove 17 from filter screen at last under scraper 10 effects.The filter screen of throwing off slewing rollers washes to get back to again through sparge pipe 12 and repeats next working cycles on the cylinder mould 2.

A cover plate 3 can be installed on the casing at cylinder mould place, outwards overflow in order to the steam that stops the temperature of high temperature slurry evaporation.

The utility model has the advantages that: 1) slurry is subjected to rotary drum and filter screen in washing process The clamping of the looped network that both form and dragging, the slurry layer thickness of its formation is even, thereby washs Water is basic identical at the resistance that slurry layer each point passes through, and has guaranteed that whole slurries all can same washings Fully contact; Slurry is subjected to two-sided filtration, multistage counter current displacement in looped network simultaneously, and is last Again through vacuum dehydration and extrusion dehydration, so replacement result is good, slurry wash degree height, black liquor Extracted amount is big; 2) avoided the backflow of washings in the pulp washing process, so reduced pumping The energy input of washings, water consumption is few simultaneously, and production capacity is big.

Claims

1, a kind of rotary drum (5) that includes a cornice filter opening and one have the into looped network displacement squeezing wash engine of the casing (15) of stock tank (16) and slurry outlet groove (17), install one in its rotary drum madial wall on the casing at place and included one group of disconnected each other section I that circumferentially distributes, III, V, the wash-in liquid bath (7) of VII, on the outer exterior wall place casing of rotary drum washout liquid bath (6) has been installed, the washout liquid bath includes one group of corresponding and mutual each other disconnected section II of the circumferential position with each section of wash-in liquid bath, IV, VI, VIII, and the end of casing has one group of pipeline that the last section in each section in wash-in liquid bath washout liquid bath opposite with the drum rotating direction is connected, promptly be communicated with the same VI of VII, the same IV of V, III is with the pipeline of II, the wash-in liquid bath is closely advancing on the section I at stock tank place to have connected the black liquid outlet pipe, the washout liquid bath has connected the washings inlet tube on the section VIII at nearly slurry outlet groove place, have section IX that is communicated with vaccum suction pipe and the section X that is communicated with the compressed air blowpipe in the rotary drum inboard at slurry outlet groove place; Feature of the present utility model is:

Rotary drum is installed in one group on the support roller (9) of importing power into and out of having between the stock tank of casing, and a side of rotary drum stretches into in the stock tank;

Advance the cylinder mould (2) of the annulus cylindricality that a cornice filter opening has been installed in the stock tank;

Article one, envelope cylinder mould in advancing stock tank wall ABC and surround filter screen for no reason (4) on the wall CDE beyond the support roller supporting area of rotary drum simultaneously;

One group of corrector roll (8) that is used for supporting, guiding, the tensioning of filter screen and turns to, idler roller (14) and slewing rollers (11);

One group of high pressure water jet pipe (12) that is used to clean filter screen is housed on casing.

2, wash engine as claimed in claim 1 is characterized in that: a cover has been installed on the bearing block of said slewing rollers (11) can have been made slewing rollers press to the elasticity pressue device of filter screen, drum surface.

3, wash engine as claimed in claim 1 or 2 is characterized in that: said rotary drum is equipped with a stripping slurry scraper (10) on the casing at nearly slurry outlet groove place.