CN216585903U

CN216585903U - Stable pulp supply device for flow feeding of paper machine

Info

Publication number: CN216585903U
Application number: CN202123035489.0U
Authority: CN
Inventors: 李栋利; 肖远强; 张成龙; 罗完新
Original assignee: Guangxi Yutong Packaging Material Co ltd
Current assignee: Guangxi Yutong Packaging Material Co ltd
Priority date: 2021-12-06
Filing date: 2021-12-06
Publication date: 2022-05-24
Anticipated expiration: 2031-12-06

Abstract

The utility model relates to a stable pulp supply device for approach flow of a paper machine, which comprises a high-level pulp regulating tank, a high-level tank, a machine bottom white water pool, a papermaking pump, a pulp flushing pump, a thickening white water pump, a wet loss pool and a dry loss pulper, wherein the high-level pulp regulating tank is arranged on the machine bottom of the high-level tank; the positions of the high-level size mixing box and the high-level box are higher than the position of the machine water white pool; the under machine white water pool is connected with an inlet of the papermaking pump through a concentration adjusting pipeline, an outlet of the papermaking pump is connected with an inlet of the high-level pulp mixing tank, an outlet of the high-level pulp mixing tank is connected with an inlet of the fan pump, an outlet of the fan pump is connected with an inlet of the high-level tank, and an outlet of the high-level tank is connected with an inlet of the fan pump; and the concentration-adjusting white water pump is respectively connected with the wet loss pool and the inlet of the dry loss pulper through a dilution pipeline. The device balances the water for the drifting system and stabilizes the liquid level of the machine bottom white water pool, thereby stabilizing the pulp supply flow rate, stabilizing the product quality, simultaneously collecting the overflow white water of the machine bottom white water pool, and reducing the white water loss and the pulp loss.

Description

Stable pulp supply device for flow feeding of paper machine

Technical Field

The utility model relates to the field of papermaking equipment, in particular to a stable pulp supply device for approach flow of a paper machine.

Background

As shown in fig. 1, the headbox in the approach system of the paper machine is used to stabilize the stock flow rate and thus the papermaking basis weight of the paper machine by means of the level difference between the headbox and the water level of the machine white water pool (used to collect the paper machine filtrate, i.e. white water, and to recycle the diluted stock) under the condition of stable stock concentration of the papermaking pump. Because the height of the high-level pulp regulating box is fixed, the liquid level of the machine bottom white water pool needs to be stable, and the purpose of stable pulp supply flow can be achieved.

In the prior art, dilution water required by a wet loss pool (used for dissolving and treating waste paper of wet paper sheets) and a dry loss pulper (used for dissolving and treating waste paper of dry paper sheets) comes from a machine white water pool, and in actual production operation, because the water consumption of the wet loss pool and the dry loss pulper is unstable, and the water consumption is large (more than 250 m) during short time³And h), the water needs to be supplemented in the machine bottom water pool when the wet loss pool or the dry loss pulper uses water, the machine bottom water pool overflows and is discharged outside when the wet loss pool or the dry loss pulper does not use water, so that a large amount of white water is lost, the liquid level fluctuation of the machine bottom water pool is large, and the liquid level difference between the high-level pulp regulating tank and the water level of the machine bottom water pool changes along with the change of the liquid level difference, so that the stability of pulp supply flow is influenced. See the calculation of the slurry-water balance:

the machine white water tank pulp water enters: 250m from high-level size mixing box³H, high level tank reflux 200m³H, adjusting the concentration of the white water by a concentration adjusting white water pump to 70m³H, 400m of white water from the wire section of the paper machine³H (FIG. 1a), vacuum white water pump to white water 20m³H (FIG. 1b), a total of 940m³/h。

Discharging slurry water of the machine white water tank: fan pump 650m³H, the surplus white water is pumped to a white water tower with the height of 120m³Per hour, the water used in the wet loss pool and the dry loss pulper is 0-250m³H is the ratio of the total weight of the catalyst to the total weight of the catalyst. Totaling: 770m when the wet loss tank or the dry loss pulper does not use water³1020m when the wet loss tank or the dry loss pulper is filled with water³H, namely: (1) when the wet loss pond or dry loss pulper is not water, white water is lost: 940m³/h-770m³/h＝150m³H; (2) when the wet loss pool or the dry loss pulper uses water, 940m of water needs to be supplemented³/h-1020m³/h＝-80m³H is the ratio of the total weight of the catalyst to the total weight of the catalyst. And the flow reading displayed by the head box pulp flow meter in actual operation is 230m³/h-270m³Jumping in the/h interval, unstable papermaking quantitative and unstable moisture, and influences the product quality.

SUMMERY OF THE UTILITY MODEL

In summary, in order to overcome the defects of the prior art, the present invention provides a stable pulp feeding device for approach flow of a paper machine.

The technical scheme for solving the technical problems is as follows: a stable pulp supply device for approach flow of a paper machine comprises a high-level pulp regulating tank, a high-level tank, a machine bottom white water tank, a papermaking pump, a fan pump, a thickening white water pump, a wet loss tank and a dry loss pulper; the positions of the high-level size mixing box and the high-level box are higher than the position of the machine water white pool; the under machine white water pool is connected with an inlet of the papermaking pump through a concentration adjusting pipeline, an outlet of the papermaking pump is connected with an inlet of the high-level size mixing box, an outlet of the high-level size mixing box is connected with an inlet of the fan pump, an outlet of the fan pump is connected with an inlet of the high-level box, and an outlet of the high-level box is connected with an inlet of the fan pump; and the concentration-adjusting white water pump is respectively connected with the wet loss pool and the inlet of the dry loss pulper through a dilution pipeline.

The utility model has the beneficial effects that: the water used for the balanced approach system stabilizes the liquid level of the machine bottom water pool, thereby stabilizing the pulp supply flow rate and the product quality, and simultaneously, the overflow white water of the machine bottom water pool is collected, thereby reducing the white water loss and the pulp loss.

On the basis of the technical scheme, the utility model can be further improved as follows:

further, a rich white water pump is arranged on the concentration adjusting pipeline.

The beneficial effect of adopting the further technical scheme is as follows: the conveying of the white water on the concentration adjusting pipeline is realized.

And the overflow tank is connected with the machine white water tank through an overflow pipeline and collects overflow white water of the machine white water tank.

The beneficial effects of adopting the further technical scheme are as follows: and collecting overflow white water of the machine white water tank.

Further, the overflow tank is connected with the white water tower through a water conveying pipeline, and an overflow white water pump is arranged on the water conveying pipeline.

The beneficial effect of adopting the further technical scheme is as follows: the collected overflow white water of the machine white water pool is stored.

Drawings

FIG. 1 is a schematic diagram of the prior art;

FIG. 2 is a schematic diagram of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. the high-level pulp mixing tank comprises a high-level pulp mixing tank 2, a high-level tank 3, a machine bottom white water pool 4, a papermaking pump 5, a fan pump 6, a thickening white water pump 7, a wet loss pool 8, a dry loss pulper 9, a thickening pipeline 10, a dilution pipeline 11, a rich white water pump 12, an overflow pool 13, an overflow white water pump 14 and a white water tower.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the utility model.

As shown in fig. 2, a stable pulp supply device for approach flow of a paper machine comprises a head box 1, a head box 2, a machine bottom water tank 3, a papermaking pump 4, a fan pump 5, a thickening water pump 6, a wet loss tank 7 and a dry loss pulper 8. The high level size mixing box 1 and the high level box 2 are located at a position higher than the position of the machine bottom water pool 3. The under machine white water pool 3 is connected with an inlet of the papermaking pump 4 through a concentration adjusting pipeline 9, an outlet of the papermaking pump 4 is connected with an inlet of the high-level pulp adjusting box 1, an outlet of the high-level pulp adjusting box 1 is connected with an inlet of the fan pump 5, an outlet of the fan pump 5 is connected with an inlet of the high-level box 2, and an outlet of the high-level box 2 is connected with an inlet of the fan pump 5. The rich white water pump 11 is arranged on the concentration adjusting pipeline 9. The concentration-adjusting white water pump 6 is respectively connected with the wet loss tank 7 and the inlet of the dry loss pulper 8 through a dilution pipeline 10. The arrangement further comprises an overflow basin 12, said overflow basin 12 being connected by an overflow line and collecting overflow white water of said machine water basin 3. The overflow tank 12 is connected with a white water tower 14 through a water conveying pipeline, and an overflow white water pump 13 is arranged on the water conveying pipeline.

In summary, the present invention is mainly improved as follows:

(1) adjusting a process pipeline, balancing water for an approach system, and stabilizing the liquid level of a white water pool of the machine: the pre-pump thickening white water of the papermaking pump 4 and the fan pump 5 is originally provided by a thickening white water pump 6 of a fine selection section, and is improved to be provided by a surplus white water pump 11. The dilution water for the wet loss pool 7 and the dry loss hydrapulper 8 is supplied by the surplus white water pump 11, and is improved by the thickening white water pump 6. The amount of the white water used for the pre-pump thickening of the papermaking pump 4 and the fan pump 5 is less, so that the white water in the system, namely the overflow white water (surplus white water) of the machine white water tank 3 is used for thickening, and the water is relatively balanced and stable. (2) The consumption of the concentrated white water in front of the pumps of the papermaking pump 4 and the fan pump 5 is less than the surplus white water amount of the system, and a small amount of white water overflow is kept in the machine white water tank 3 all the time, so that the liquid level of the machine white water tank 3 is stable.

(2) An overflow pool 12 is added to collect the overflow white water in the machine white water pool 3, and an overflow white water pump 13 (flow Q is 100m3/H, lift H is 20m) is added to pump the white water in the overflow pool 12 to the white water tower, and the overflow white water in the machine white water pool 3 is collected to reduce white water loss and slurry loss.

And (3) calculating the slurry-water balance:

the machine white water tank 3 is filled with water: 250m from the high-level size mixing box 1³H, 200m of reflux from head tank 2³H, the residual white water pump 11 is used for adjusting the concentration of the white water to 70m³H, 400m of white water from the wire section of the paper machine³H (FIG. 2a), vacuum white water pump to white water 20m³H (FIG. 2b), a total of 940m³/h。

And (3) discharging slurry from the machine white water tank: fan pump 5650m³H, the surplus white water pump 11 is used for thickening by 150m³H, the overflow white water pump 13 to the white water tower 14 is 100m³H, total: 920m³H (in actual operation, the flow rate of the white water removal tower is increased to 100-³After/h, white water was recovered completely without run-off).

In actual operation, the flow reading displayed by the pulp flow meter from the head box 2 is in jumping in an interval of 248m3/h-252m3/h, the papermaking quantitative is stable, the water content is stable, and the product quality is stable. The reading fluctuation of the slurry supply flow displayed by the flowmeter is 3m³About H, the product quality is stable; the machine white water pool 1 is level stable and keeps a small amount of white water overflowing uninterruptedly to the overflow pool 12.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A stable pulp supply device for approach flow of a paper machine is characterized by comprising a high-level pulp regulating tank (1), a high-level tank (2), a machine bottom white water pool (3), a papermaking pump (4), a fan pump (5), a concentration regulating white water pump (6), a wet loss pool (7) and a dry loss pulper (8); the positions of the high-level size mixing box (1) and the high-level box (2) are higher than the position of the machine water pool (3); the machine bottom white water pool (3) is connected with an inlet of the papermaking pump (4) through a concentration adjusting pipeline (9), an outlet of the papermaking pump (4) is connected with an inlet of the high-level pulp adjusting box (1), an outlet of the high-level pulp adjusting box (1) is connected with an inlet of the fan pump (5), an outlet of the fan pump (5) is connected with an inlet of the high-level box (2), and an outlet of the high-level box (2) is connected with an inlet of the fan pump (5); and the concentration-adjusting white water pump (6) is respectively connected with the wet loss pool (7) and the inlet of the dry loss pulper (8) through a dilution pipeline (10).

2. A stable stock supply arrangement for flow to a paper machine according to claim 1, characterised in that the thickening line (9) is provided with a rich white water pump (11).

3. A stable flow feed arrangement for a paper machine according to claim 1 or 2, characterized in that it further comprises an overflow basin (12), said overflow basin (12) being connected by an overflow conduit and collecting overflow white water of said machine water basin (3).

4. A stable stock supply device for flow to a paper machine according to claim 3, characterised in that the overflow tank (12) is connected to a white water tower (14) by a water transfer line, on which an overflow white water pump (13) is arranged.