JPH0369688A - Deaeration tank for paper-making raw material - Google Patents

Abstract

PURPOSE:To obtain the subject tank for the deaeration of a paper-making raw material, producible at a low cost and effective in reduction the electrical power consumption and improving the quality of the produced sheet by placing plural cleaners, plural feed pipes, etc., in an deaeration tank. CONSTITUTION:The objective tank is produced by providing a primary cleaner accept feed pipe 3 or plural primary accept feed pipes 2, an outlet port 4 of the deaeration tank, a secondary cleaner accept feed pipe 6 or plural secondary accept feed pipes 5, a weir 7 and a deaeration tank overflow port 8 in a deaeration tank 1 in the order.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Industrial Application Field This invention relates to the degassing of papermaking raw materials after dust removal by screens, cleaners, etc.

(B) Conventional technology To explain a conventional deaeration tank based on Figs. 3 and 4, Fig. 3 shows a single-accept system that supplies only the primary cleaner accept. Primary accept feed pipe 2, deaeration tank outlet 4,
A weir 7 and a degassing tank overflow 8 are sequentially provided, and a primary cleaner accept supply pipe 3 to which a plurality of primary accept feed pipes 2 are connected is provided at the bottom of the degassing tank 1, and the other end of the top of the degassing tank 1 is connected to a primary cleaner accept feed pipe 3. Ahlstrom's Ensava equipped with a vacuum pump Sakshi stove 9.
This is the degassing tank of c.

Figure 4 shows a plurality of primary accept feed pipes 2, a plurality of secondary accept feed pipes 5,
A deaeration tank outlet 4, i[7, and a deaeration tank overflow 8 are provided in sequence, and the lower part of the deaeration tank 1 has a primary cleaner accept supply pipe 3 to which a plurality of primary accept feed pipes 2 are connected, and a plurality of secondary This is a double-accept type degassing tank, in which a secondary cleaner accept supply vibro to which an accept feed pipe 5 is connected is provided, and a vacuum pump sushi stove 9 is provided at the other end of the top of the degassing tank 1.

(C) Problems to be solved by the invention In the single-accept system, only good raw materials supplied from the next accept feed pipe 2 are fed to the degassing tank outlet 4.
There are no particular problems with garbage as it is sent out more than once.

However, since good raw materials also flow out from the deaeration tank overflow port 8 and are recirculated, screens, cleaners,
Since the size of the distribution system such as a pump increases, which increases the initial cost of the equipment and increases the power consumption of the pump, in recent years a double-accept system in which the feed is also supplied from the secondary accept feed pipe 5 has been adopted.

In the case of the double-accept method, in the conventional case, a mixture of raw material with good primary cleaner acceptance and raw material with slightly poor secondary cleaner acceptance exits from the degassing tank outlet 4 in FIG. 4. Additionally, there is a problem in that mixed raw materials also flow out from the degassing tank overflow 8.

(D) Means for solving the problem In the double-accept method, inside the degassing tank,
It is characterized by sequentially providing a primary cleaner accept supply pipe or a plurality of primary accept feed pipes, a degassing tank outlet, a secondary cleaner accept supply pipe or a plurality of secondary accept feed pipes, a weir, and a degassing tank overflow port. This relates to a degassing tank for papermaking raw materials.

(E) Although not shown in the diagram, the end of the tank removal outlet is connected to the head box and becomes a product sheet, so all raw materials with good primary cleaner acceptance must be used.
On the other hand, raw materials with slightly poor secondary cleaner acceptance are used to control the level of the deaeration tank in order to prevent fluctuations in basis weight due to pump pulsation, so they should be flowed out from the deaeration tank overflow port 8 as much as possible to be recirculated and re-cleaned. When installing the deaeration tank outlet 4, the position is the primary accept and 2.
This is provided during the next acceptance supply.

(F) Example Embodiments of the present invention will be described based on the drawings.

Example work Figure 1 shows a double-accept deaeration tank using feed pipes, in which a plurality of primary accept feed pipes 2 connected to a primary cleaner accept supply pipe 3 are inserted into the interior from the lower part of the deaeration tank l. Insert it and place it so that its tip comes out above the liquid level formed by the weir 7, and beside it, a deaeration tank outlet 4 is provided at the bottom of the deaeration tank 1, and a secondary cleaner accept supply vibro is installed. Insert the plurality of connected secondary accept feed pipes 5 into the deaeration tank 1 from the bottom, place them above the liquid level in the same way as the primary accept feed pipes 2, and then insert them into the deaeration tank 1. A weir 7 is provided to form a liquid pool, and the weir 7
Next to the deaeration tank overflow port 8 is the deaeration tank 1.
A vacuum pump and a stove 9 are provided at the other end of the upper part of the degassing tank 1.

The primary and secondary accept raw materials are supplied into the degassing tank 1 through a plurality of primary and secondary accept feed pipes 2.5, and the good raw materials flowing from the primary accept feed pipe 2 are sent to the vacuum pump sacsi stove 9. It is degassed by a connected vacuum pump (not shown) and sent to the next process from the entire degassing tank outlet 4 to become a product sheet.

The slightly bad raw material flowing in from the secondary accept feed pipe 5 is also degassed in the same way as the secondary accept, and a portion is sent to the next process from the degassing tank outlet 4, and the remaining secondary accept is formed at the weir 7. In order to control the level of the liquid pool in the deaeration tank 1, a small amount of liquid is allowed to exceed the base 7, flows out from the deaeration tank overflow port 8, is returned to the secondary cleaner, and is recirculated.

The degassing method is basically based on diffusion by collision with the wall of the degassing tank body and degassing by a vacuum pump, and since the structure of the degassing tank body can vary widely, the structure of the tank is not limited.

Embodiment 2 To explain another embodiment of the present invention shown in FIG. 2, in place of the secondary accept feed pipe 2 and secondary accept feed pipe 5 of Embodiment 1 (FIG. 1), a primary cleaner accept supply is used. Insert the pipe 10 and the secondary cleaner accept supply pipe 11 from the side of the deaeration tank 1 body,
Primary and secondary cleaner accept supply pipes 10 and 11 run above the liquid level formed by the weir 7, and the upper part of the cleaner accept supply pipe has a structure with many small holes for feeding raw materials. The arrangement order of each part and the distribution route of raw materials are the same as in FIG. 1.

(G) Effects of the Invention The present invention is a degassing tank that adopts a cost-reducing double-accept system, which has low equipment costs for screens, cleaners, pumps, etc., reduces power consumption, and uses raw materials with less waste. By paper-making the product sheet, the quality of the product sheet can be improved.

[Brief explanation of drawings]

1 and 2 are schematic diagrams showing representative embodiments of the present invention. FIG. 3 is a schematic diagram of a conventional single-accept type degassing tank, and FIG. 4 is a schematic diagram showing a conventional double-accept type degassing tank. 1: Detank, ￥1lffi Me 2 Figure 1st accept feed pipe, 1st cleaner accept supply pipe, deaeration tank outlet, 2nd accept feed pipe, 2nd cleaner accept supply pipe, weir, deaeration tank overflow, vacuum Bonpsakushonro, 1st cleaner accept supply pipe 2nd cleaner accept supply pipe, 31 yen 1 41st man

Claims (1)

[Claims] A primary cleaner accept supply pipe or a plurality of primary accept feed pipes, a deaeration tank outlet, a secondary cleaner accept supply pipe or a plurality of secondary accept feed pipes, a weir, and a deaeration tank overflow port are installed inside the deaeration tank. A deaeration tank for papermaking raw materials, which is characterized by being installed sequentially.