Slurry dispersing tank

Abstract

The utility model discloses a pulp dispersing tank which comprises a tank body, a stirrer arranged on the side wall of the tank and a return pipe for pumping waste pulp to a high position from the bottom to return, the return pipe is arranged on the side wall of the tank body and is not coplanar with the stirrer, a slurry outlet of the return pipe extends into the tank body, the return pipe is a reducer pipe of which the caliber is gradually reduced, and a bent pipe which is bent downwards is arranged at the tail end of the reducer pipe. By adjusting the length of the reducer pipe, the change gradient of the pipe diameter and the length and the bending degree of the bent pipe, the jet flow pressure and the jet distance of the slurry flowing back at the slurry outlet are adjusted, so that the flowing back slurry falls back to the middle of the tank body as much as possible, the flowing back slurry has a certain impact force on the original slurry and is rapidly mixed with the original slurry, and the slurry dispersing efficiency is improved. The number of times that broken paper blocks and clamps the pulp dispersing tank is reduced, the pulp dispersing time is shortened, the electric energy consumption is reduced, the abrasion of a stirrer cutter head is reduced, and the number of times of shutdown replacement is reduced, so that the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a waste paper stirring device, especially to a pulp distributing tank. BACKGROUND

[0002] The paper is made by sending the pulp to the head tank through the pulp system, the pulp is sprayed out through the head tank, and after the forming separation through the wool cloth and the forming net, the paper is taken out through the pressing, drying, wrinkling and winding; the paper edge of the paper after drying will fall into the pulp distributing tank under the machine after the edge trimming part, and the abnormal raw paper and the residual roll produced by the rear end rewinding are pulled to the pulp distributing tank under the machine for reboiling, all the abnormal reboiling raw paper enters the pulp distributing tank, and the waste paper is broken by the pulp distributing tank stirrer cutter plate and then is used after the pulp refining and pulping. In this pulp distributing process, the two pulp distributing tank stirrers continuously stir and continuously flow to break the waste paper, the backflow pipe of the pulp extracting pipeline is arranged between the two stirrers, the stirred pulp is extracted to the pulp preparation tank for reuse. Since the backflow port of the pulp extracting pipeline of the pulp distributing tank is connected between the two stirrers of the pulp distributing tank, the distance from the bottom of the tank is 200cm, the upper edge of the stirrer is parallel, and the backflow pipe is a pipeline with a diameter of 200mm, when the liquid level in the tank is low, the backflow pipe is low in position, the pipe diameter is large, the pressure of the backflow pulp flow extracted to the pulp distributing tank is small, and the waste paper in the tank cannot form effective impact force, and the waste paper is automatically left along the pipeline from the tank wall, so that the pulp distributing effect cannot be effectively improved. At present, the pulp distributing effect can only be improved and ensured by increasing the stirring time of the pulp distributing tank stirrer, which leads to high power consumption and is not conducive to energy saving. In addition, the running directions of the two stirrers are consistent, the backflow port of the pulp extracting pipeline of the pulp distributing tank is arranged between the two stirrers, the waste paper subjected to the opposite force is not conducive to the diffusion of the waste paper pulp in the middle to other places, and the pulp distributing effect is affected; especially when there is a lot of waste paper, the waste paper is blocked in the middle of the two stirrers, the waste paper is not completely broken, and the waste paper flows out, so that the raw paper is reboiled, the yield is affected, and if the waste paper is seriously blocked, the stirrer cannot rotate, the operator needs to use the water pipe to impact the blocked waste paper to restore the stirring state, which is time-consuming and laborious, and even causes shutdown and affects the production capacity. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at improving the pulp distributing efficiency of the waste paper and reducing the energy consumption, and provides a pulp distributing tank.

[0004] Technical scheme: the pulp distributing tank, including the tank body, the stirrer arranged on the side wall of the tank and the backflow pipe for extracting the waste paper pulp from the bottom to the high place, the backflow pipe is arranged on the side wall of the tank body and is not coplanar with the stirrer, the pulp outlet of the backflow pipe extends into the tank body, and the backflow pipe is a reducing pipe with a gradually reduced diameter.

[0005] Further, the return pipe can be arranged on the side wall of the tank adjacent to the stirrer, or on the side wall opposite to the stirrer. The pulp outlet of the reducing pipe is 300-350 cm away from the bottom wall of the tank. The diameter of the reducing pipe gradually decreases from 200 mm to 80 mm, and the length is 150-200 mm. The end of the reducing pipe is provided with a downwardly bent elbow pipe. The diameter of the elbow pipe is the same as that of the end of the reducing pipe, the bending degree is 35-50°, and the length is 80-100 mm. By adjusting the length of the reducing pipe, the change gradient of the pipe diameter, the length and the bending degree of the elbow pipe, the pressure and the jet distance of the returned pulp jet at the pulp outlet are adjusted, so that the returned pulp falls as much as possible in the middle of the tank. The arrangement of the elbow pipe enables the returned pulp to fall into the tank, so that the returned pulp has a certain impact force on the original pulp and is rapidly mixed with the original pulp, thereby increasing the pulp dispersion efficiency. The total length of the reducing pipe and the elbow pipe is not more than 300 mm, so as to prevent the pipeline from being too long and causing pulp hanging.

[0006] Further, the two stirrers are arranged oppositely, one rotates counterclockwise and the other rotates clockwise. The damaged paper between the two stirrers is stirred out and pressed to the bottom of the tank, so as to increase the uniformity of the pulp dispersion and improve the pulp dispersion effect of the damaged paper, thereby avoiding the situation that the damaged paper is not fully stirred and flows out, resulting in the original paper being returned to the furnace due to the pulp points, and affecting the yield. Especially when both of the two stirrers rotate from the middle to the outside, the damaged paper between the two stirrers is more easily stirred out and pressed to the bottom of the tank, and the pulp dispersion effect of the damaged paper is better.

[0007] Further, the return pipe is communicated with the pulp suction pipe. The bottom of the return pipe is provided with a pulp suction pump. The return pipe is used for returning the pulp sucked out by the pulp suction pump to the pulp dispersion tank for further pulp dispersion. The pulp suction pipe is used for sucking out the well-dispersed pulp for standby. The return pipe and the pulp suction pipe are respectively provided with interlocking control valves for adjusting the opening degree of the single valve according to the liquid level in the tank. The valve and the pulp suction pump are interlocked. When the pulp suction pump is opened, the interlocking control valve is opened. The opening degrees of the two valves are 100%. The two valves can be set to automatic mode or manual mode. When the pulp suction pump is stopped, the interlocking control valve is closed. According to whether the liquid level in the pulp dispersion tank reaches the set value, the opening degrees of the valves of the pulp suction pipe and the return pipe are controlled to be 0-100%, so as to determine whether to carry out 100% return for pulp dispersion, or to increase the return times of the damaged paper pulp for pulp dispersion and pulp suction, thereby further improving the pulp dispersion efficiency and reducing the amount of the original paper returned to the furnace due to the unqualified pulp points caused by the insufficient stirring of the damaged paper.

[0008] Beneficial effects: Compared with the prior art, this utility model has the following advantages: 1. The adjustment of the return pipe position and the setting of the variable diameter pipe reduce the number of times paper waste blocks the pulp distribution tank, and improve the pulp distribution efficiency of paper waste by 80%; 2. The time for pulp mixing and pumping is shortened by 40%, which greatly reduces power consumption; 3. The wear of the agitator blade is reduced, the number of downtime replacements is reduced, and thus the production efficiency is improved; 4. The setting of the bend pipe makes the falling pulp have a certain impact on the pulp in the tank, further improving the pulp distribution effect; 5. The amount of pulp spots in the raw paper that need to be returned to the furnace due to incomplete pulping of paper waste is reduced. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model;

[0010] Figure 2 This is a schematic diagram of the slurry outlet structure of the reflux pipe of this utility model. Detailed Implementation

[0011] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0012] Example 1

[0013] like Figure 1 The illustrated pulp tank includes a tank body 1, two agitators 2 mounted on the side wall of the tank, and a return pipe 3 for pumping waste pulp from the bottom to a higher position for recirculation. The return pipe 3 is located on the side wall of the tank body 1 adjacent to the agitators 2. The outlet of the return pipe extends into the tank body 1 and is a reducing pipe 4 with a decreasing diameter. The outlet of the reducing pipe 4 is 300cm to 350cm from the bottom wall of the tank body 1. The diameter of the reducing pipe 4 decreases from 200mm to 80mm, and its length is 150mm (the length of the reducing pipe 4 can also be set to 150mm to 200mm to reduce the pressure required for the recirculated pulp to be injected into the tank body 1). Figure 2 As shown, the end of the reducing pipe 4 is equipped with a downward-curved bend 5 with a curvature of 35° (the curvature can also be set to 35° to 50° depending on the increase of the return pulp spraying distance). The diameter of the bend 5 is the same as the diameter of the end of the reducing pipe 4, which is 80mm, and the length is 80mm (it can also be set to 80mm to 100mm depending on the increase of the return pulp spraying distance). Two agitators 2 are provided, and the two agitators run in opposite directions: one rotates counterclockwise and the other rotates clockwise. Both agitators rotate from the middle outward, causing the waste paper in the middle of the agitator to be stirred out and pressed against the bottom of the tank 1, increasing the pulping effect of the waste paper and preventing the waste paper from not being fully broken up. Adjusting the length and discharge pressure of the pulp outlet causes the return pulp to fall back into the middle of the two agitators 2. The bend allows the return pulp to fall downward into the tank 1, which has a certain impact force on the pulp inside, and mixes quickly with the original pulp in the tank 1, further improving the pulping efficiency.

[0014] The backflow pipe 3 is communicated with the suction pipe 6, the bottom of the backflow pipe 3 is provided with a suction pump 8, the interlocking control valve 7 which adjusts the opening of the single valve according to the liquid level in the tank is respectively arranged in the backflow pipe 3 and the suction pipe 6, and the interlocking control valve 7 is interlocked with the suction pump 8, the sum of the opening of the two valves is 100%, which can be set to automatic mode or manual mode. The interlocking control valve is opened after the suction pump is opened, and the interlocking control valve is closed after the suction pump is stopped. When the liquid level of the pulp distribution tank 1 does not reach the set value, the valve opening of the suction pipe 6 is 0% and the valve opening of the backflow pipe 3 is 100%, and 100% backflow is carried out for pulp distribution; when the liquid level of the pulp distribution tank 1 reaches the set liquid level, the valve of the suction pipe 6 starts to gradually open, and at the same time the valve opening of the backflow pipe 3 starts to gradually decrease, the sum of the valve openings of the two valves is 100%, the number of backflow pulp distribution of waste paper pulp is increased, and the amount of original paper returned to the furnace due to unqualified pulp points caused by insufficient crushing of waste paper is reduced. When high wet strength base paper is made, it is difficult to treat waste paper, the interlocking control valve 7 is adjusted to manual mode, the number of 100% backflow pulp distribution is increased, and the pulp distribution effect is improved.

[0015] Example 2

[0016] Different from example 1, the end of the reducing pipe 4 is not provided with an elbow pipe, the length of the reducing pipe 4 is adjusted to further adjust the pressure of the pulp in the pipe, so that the sprayed pulp falls as much as possible in the middle of the tank 1 and the middle of the two mixers, and the uniformity of the mixed pulp is increased.

[0017] Example 3

[0018] Different from example 1, the backflow pipe 3 is arranged on the side wall of the tank 1 opposite to the mixer 2, the pulp outlet of the backflow pipe extends into the inside of the tank 1, which is a reducing pipe 4 with a diameter gradually decreasing from large to small, the pulp outlet of the reducing pipe 4 is 300cm-350cm away from the bottom wall of the tank 1, the diameter of the reducing pipe 4 decreases from 200mm to 80mm, and the length is 200mm (the length of the reducing pipe 4 can also be set to 150mm-200mm as the demand for the pressure of the backflow pulp sprayed into the tank 1 increases). The end of the reducing pipe 4 is provided with a downward bending elbow pipe 5 with a bending degree of 50° (the bending degree can also be set to 35°-50° according to the decrease of the length of the backflow pulp spraying distance), the diameter of the elbow pipe 5 is the same as the diameter of the end of the reducing pipe 4, which is 80mm, and the length is 100mm (the length can also be set to 80mm-100mm according to the shortening of the distance of the backflow pulp spraying). The length of the pulp outlet and the pulp outlet pressure are adjusted, so that the backflow pulp falls as much as possible in the middle of the two mixers 2, so that the backflow pulp has a certain impact force on the pulp in the tank 1, and the backflow pulp is quickly mixed with the original pulp in the tank 1, and the pulp distribution efficiency is improved.

Claims

1. A bulk slushing tank comprising a tank body (1), a stirrer (2) provided on the side wall of the tank, and a backflow pipe (3) for backflowing broke pulp from the bottom to a high place; characterized in that, The backflow pipe (3) is arranged on the side wall of the tank body (1) and is not coplanar with the stirrer (2), and the pulp outlet of the backflow pipe (3) extends into the tank body (1) and is a reducing pipe (4) with a gradually decreasing diameter.

2. The spreader chute of claim 1, wherein, The pulp outlet of the reducing pipe (4) is 300-350 cm away from the bottom wall of the tank body (1).

3. The spreader chute of claim 1, wherein, The diameter of the reducing pipe (4) is 200-80 mm, and the length is 150-200 mm.

4. The spreader chute of claim 1, wherein, The end of the reducing pipe (4) is provided with a downwardly bent elbow pipe (5), and the diameter of the elbow pipe (5) is the same as that of the end of the reducing pipe (4).

5. The spreader chute of claim 4, wherein, The bending degree of the elbow pipe (5) is 35-50°.

6. The spreader chute of claim 4, wherein, The length of the elbow pipe (5) is 80-100 mm.

7. The spreader chute of claim 1, wherein, Two stirrers (2) are arranged, and the running directions of the two stirrers are opposite.

8. The spreader chute of claim 1, wherein, The backflow pipe (3) is communicated with a pulp pumping pipe (6), the backflow pipe (3) is provided with a pulp pumping pump (8), the backflow pipe (3) and the pulp pumping pipe (6) are respectively provided with interlocked control valves (7) for adjusting the opening degrees of single valves according to the liquid level in the tank, the total opening degrees of the two valves are 100%, and the pulp pumping pump (8) is interlocked with the interlocked control valves (7).

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