JP3504419B2 - Pulp slurry dewatering and concentration equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dewatering / concentrating apparatus for dewatering / concentrating slurried low-concentration pulp into medium-concentration pulp. 2. Description of the Related Art As a conventional apparatus of this type, for example, there is a concentration washing machine disclosed in Japanese Patent Application Laid-Open No. 4-257388. In this concentration washing machine, a wire mesh is lined with a drum made of punched metal, one end in the axial direction of the drum is opened, and a plurality of blade plates are provided at the other end in the axial direction. ), And inside the drum, a cleaning nozzle of a wire mesh, a stock feed pipe having a stock discharge port close to the blade plate, a fresh water pipe having a large number of injection holes, and a refill white water The pipes and the pipes are respectively introduced from outside. In such a conventional concentration washer, when the drum is driven to rotate, the stock is directly injected and collided with a plurality of blades provided at the other end in the axial direction of the drum from a stock feed pipe, whereby While assisting the rotation of the drum, and performing the rubbing and washing of the raw material by the rotation of the impeller, the stock is washed with the jet water from the fresh water pipe and the refill white water pipe, and the jet water from the washing nozzle. It is designed to wash wire mesh. [0004] A conventional concentration washer is constructed as described above, and a stock (pulp slurry) is fed from a stock feed pipe to a blade provided at an axial end of a drum. ) Is directly injected and collided, so that the stock cannot be efficiently supplied from the stock supply pipe to the inner peripheral surface of the drum. There has been a problem that the efficiency of dehydration and concentration is significantly reduced, and that the yield is very poor due to rubbing and washing. [0005] The present invention has been made to solve the above problems, dehydration concentration of the pulp slurry by centrifugal force of the sheet cylinder over the drum is performed efficiently, significant improvement in yield is drawing, and, Pulp slurry after dehydration and concentration
Can be easily recovered by shower fluid
And to obtain a dewatering concentrator of pulp slurry that. [0006] [0007] [0008] [0009] [Means for Solving the Problems] dewatering concentrator pulp slurry according to the first aspect of the present invention, the rectifying nozzle
Pulp slurry from the raw material supply pipe
Spray in a mat shape toward the direction of rotation of the cylinder drum
Having a nozzle width in the drum axis direction, the scraping means,
Shower fluid is rotated in the opposite direction to the rotation of the cylinder drum.
To the inner peripheral surface of the cylinder drum in the direction of
It is a shower nozzle . [0010] [0011] [0012] DETAILED DESCRIPTION OF THE INVENTION Hereinafter, an embodiment of the present invention. Embodiment 1 FIG. FIG. 1 is a schematic sectional view showing an apparatus for dehydrating and concentrating pulp slurry according to Embodiment 1 of the present invention, and FIG.
3 is an enlarged view of a main part of FIG. 2. In the figure, reference numeral 1 denotes a drum casing, and the drum casing 1 includes a main body bat 1A and a cover 1B attached to the upper open end of the main body bat 1A so as to be openable and closable. It has a drain port 2 opening downward at the bottom thereof, and a pulp outlet 3 having a downward opening which is isolated from the drain port 2. Reference numeral 4 denotes a cylinder drum for performing dehydration and concentration of the pulp slurry rotatably housed in the drum casing 1.
A plurality of mounting bars 7 arranged at appropriate intervals along the circumferential direction between an inlet-side disk 5 at one end in the axial direction and an outlet-side ring 6 at the other end in the axial direction. Mounting bar 7
The wire cloth 8 has a cylindrical lining. [0015] Here, to describe the details of the wire cloth 8, the wire cloth 8, as was affixed to the punch plate 9 as shown in FIG. 4, or 5
As shown in the figure, reinforcing wire 1 made of wire or flat steel
Use a double wire mesh structure which is bonded to the wire 0 by welding, strong adhesive or stitching. Note that the wire cloth 8 having the double wire mesh structure shown in FIG. 5 may have a triple or quadruple wire mesh structure. In the case of a punch plate 9 to which a wire cloth 8 is attached as shown in FIG . 4, the mechanical strength of the wire cloth 8 can be sufficiently satisfied by the punch plate 9. As shown in FIG . 5, in the case of the reinforcing wire 10 to which the wire cloth 8 is adhered, the opening ratio is greatly improved as compared with the punch plate 9 and the air permeability and water permeability are increased. The concentration efficiency is greatly improved, and the wire cloth 8 can be easily washed. [0018] Thus, the wire cloth 8 made of a polymer of the punch plate 9 or reinforcing wire 10 is previously divided in advance a plurality in the circumferential direction of the cylinder drum 4 as shown in FIG. 3, the The divided wire cloth 8 is detachably lined with the mounting bar 7 with bolts and nuts. With this lining, the punch plate 9 or the reinforcing wire 10 is attached to the mounting bar 7.
And the wire cloth 8. [0019] Therefore, the cylinder drum 4, the other axial end at one axial end is closed by the inlet-side disk 5 is opened on the outlet side ring 6, and, wire cloth 8 and punch plate 9 or reinforcing wire and a Te water permeability <br/> by a polymer of 10. The cylinder drum 4 is provided with a driving roller 11 arranged in the main body butt 1A of the drum casing 1.
And the free rollers 12, and the driving rollers 11
Is rotationally driven by a motor (drive means) M,
The cylinder drum 4 is driven to rotate in one direction by an outer peripheral driving method. [0021] 13 the inlet side disk 5 of the cylinder drum 4
Is a raw material supply pipe penetrating from the outside into the cylinder drum 4 through an axial center portion thereof, and a rectifying nozzle 14 located in the cylinder drum 4 is provided at a distal end side of the raw material supply pipe 13. . [0022] The rectifier nozzle 14 is for injection into a mat-like pulp slurry fed from the raw material supply pipe 13 the inner circumferential surface of the cylinder drum 4 against (wire cloth 8), as shown in FIG. 6 And has a nozzle width L in the axial direction for jetting in a mat shape. [0023] More particularly, the rectifier nozzle 14
The injection port 14a having the nozzle width L injects the pulp slurry in the rotation direction of the cylinder drum 4 (the direction of arrow a) as shown in FIG. Since the flow width and the flow thickness of the pulp slurry injected from the injection port 14a of the rectifying nozzle 14 vary depending on the type of the raw material, the flow width and the flow thickness of the raw material to be treated are calculated in advance. Then, the opening size of the injection port 14a is determined based on the result. As shown in FIG. 7, the rotation speed S1 of the cylinder drum 4 and the wire cloth 8
The rotational speed of the cylinder drum 4 is controlled to be variable so that the flow rate S2 of the pulp slurry sprayed on the cylinder drum 4 is as high as possible (S1 = S2 or S1 ≒ S2). . [0026] In FIGS. 2 and 3, 15 is a shower nozzle for scraping slurry disposed in the cylinder drum 4, the shower nozzle 15 at a position close to the inner peripheral surface of the cylinder drum 4 Wire cloth 8 facing in the opposite direction to the rotation direction of cylinder drum 4
By spraying a shower fluid such as high-pressure water on the inner surface of the cylinder drum 4, the pulp slurry 16 after dehydration and concentration attached to the inner peripheral surface of the cylinder drum 4 is scraped off. [0027] Next, the operation will be described. The pulp slurry to be processed is supplied from the raw material supply pipe 13 in a state where the cylinder drum 4 is rotationally driven by the activation of the motor M. Here, if the pulp slurry supplied from the raw material supply pipe 13 has a raw material concentration of 1% or less near the inlet of the rectifying nozzle 14, the yield may decrease depending on the raw material freeness. Is preferably 1 to 2%. The pulp slurry supplied from the raw material supply pipe 13 is sprayed from the rectifying nozzle 14 toward the rotating direction of the cylinder drum 4 in a mat shape onto the wire cloth 8 on the inner peripheral surface. The mat-like pulp slurry 16 sprayed onto the wire cloth 8 rotates at the same speed as the rotation speed of the cylinder drum 4, and the pulp slurry 16 is rotated by the centrifugal action of the cylinder drum 4 at this time. Is dehydrated and concentrated. By the dehydration and concentration, the cylinder drum
Dewatering was spilled from the outer peripheral region of 4 is discharged from the discharge water inlet 2 flows down on the inner bottom of the body butt 1A of the drum casing 1. After the pulp slurry 16 has been dehydrated and concentrated in this manner, the shower fluid flows from the shower nozzle 15 in the direction opposite to the rotation direction of the cylinder drum 4 to the inner peripheral surface of the cylinder drum 4. By being sprayed, the pulp slurry 16 after dehydration and concentration attached to the wire cloth 8 is scraped off, and the pulp slurry 16
Flows out of the pulp outlet 3. In the first embodiment, a cleaning nozzle for injecting cleaning water toward the inner peripheral surface of the cylinder drum 4 may be provided in the cylinder drum 4. The cylinder drum 4 may be tilted by automatic mechanical means so that the open end (outlet ring 6) side is lowered. As described above, according to the first aspect of the present invention, the pulp slurry is jetted from the rectifying nozzle to the inner peripheral surface of the cylinder drum in a mat shape toward the rotation direction of the cylinder drum. While the shower fluid is cylinderized
The cylinder drive is turned in the opposite direction to the rotation of the ram.
Since the configuration for injecting the inner peripheral surface of the arm, greatly enhance the yield improved dewatering concentration efficiency of the pulp slurry by centrifugal force of the cylinder drum is figure and, after dehydration concentrated
Pulp slurry is easily scraped off by shower fluid
There is an effect that is Ru can be recovered. [0036]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic sectional view of a dehydrating and concentrating apparatus according to Embodiment 1 of the present invention. FIG. 2 is a view taken along the line AA of FIG. 1; FIG. 3 is an enlarged view of a main part of FIG. 2; FIG. 4 is a perspective view showing an embodiment of a wire cloth lined with a cylinder drum. FIG. 5 is a perspective view showing another embodiment of a wire cloth lined with a cylinder drum. FIG. 6 is a perspective view of a rectifying nozzle. FIG. 7 is an explanatory diagram showing a relationship between a rotation speed of a cylinder drum and a flow rate of pulp slurry. [Description of Signs ] 1 Drum casing 1A Main body butt 2 Drain port 3 Pulp outlet 4 Cylinder drum 5 Inlet disk 6 Outlet disk 7 Mounting bar 8 Wire cloth 9 Punch plate 10 Reinforcing wire 11 Driving roller 12 Free roller 13 Raw material supply pipe 14 Rectifying nozzle 14a Injection port 15 Shower nozzle 16 Pulp slurry L Nozzle width M Motor (drive means)

Continuation of front page (56) References JP-A-3-227475 (JP, A) JP-A-3-33290 (JP, A) JP-A-3-167383 (JP, A) JP-A-51-136903 (JP) JP-A-6-346393 (JP, A) JP-A-58-208481 (JP, A) JP-A-35-17885 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB Name) D21C 9/02-9/06 D21C 9/18

Claims (1)

(57) [Claim 1] A drum casing and a water-permeable water-tightly arranged rotatably housed inside the drum casing with one axial end closed and the other axial end opened. A cylinder drum, a raw material supply pipe introduced into the cylinder drum from outside, and a pulp slurry provided from the raw material supply pipe and disposed in the cylinder drum, and supplied from the raw material supply pipe to the cylinder drum. A rectifying nozzle that jets toward the inner peripheral surface of the
E Bei and means for scraping the pulp slurry after dewatering concentrated to adhere to the inner circumferential surface of the cylinder drum from the inner peripheral surface of the cylinder drum, the drum casing, dewatering the pulp slurry by centrifugal force of the cylinder drum A drain port for discharging the dehydration at the time of concentration, and a pulp slurry having a pulp outlet that is isolated from the drain port and connected to the open end of the cylinder drum to discharge the pulp slurry after dehydration and concentration. In the dehydrating and concentrating apparatus, the straightening nozzle has a nozzle width in a drum axis direction in which pulp slurry from the raw material supply pipe is jetted in a mat shape toward the rotation direction of the cylinder drum,
Said scraping means, pulp, wherein the this <br/> to the rotational direction of the cylinder drum shower fluid consists shower nozzle for injecting the inner peripheral surface of the cylinder drum towards the opposite direction Slurry dewatering and concentration equipment.