JPS6130606B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a plate for a filter press.

[Conventional technology and its problems]

In a filter press, multiple plates are movably arranged side by side with cloth interposed between them, each plate is closed to form a chamber between the plates, and sludge is pressurized into this chamber for over-dehydration. .

By the way, there is a conventional system in which a temperature control pipe is embedded in the board and a heating medium is passed through the temperature control pipe to adjust the temperature of the stock solution or liquid during overwork. -2927).

However, in order to prevent destruction due to overpressure, the above-mentioned conventional board needs to be thickened, which increases the weight of the board and makes it difficult for the amount of heat from the adjustment pipe inside the board to be transmitted to the board surface. With conventional plates, it was not possible to dry the sludge after dewatering, and it was not possible to reduce the water content of the dehydrated cake beyond a certain level.

Therefore, in this invention, the thickness of the board itself is thin,
The purpose of the present invention is to provide a plate for a filter press capable of dewatering and drying sludge at the same time.

[Means for solving problems]

This invention forms a hollow plate by connecting a large number of hollow cylindrical bodies in parallel, and in each cylindrical body forming this hollow plate, through-holes communicating with the adjacent cylindrical bodies are formed alternately above and below to form a hollow plate. Forming a fluid passage inside the plate,
A high-temperature fluid is introduced into the fluid passageway so that the internal pressure of the hollow plate and the overpressure are approximately balanced.

[Effect]

In this invention, as mentioned above, the plate itself is a cylindrical body that forms a fluid passage, so the plate itself is heated by the high-temperature fluid, so the heating efficiency of the dehydrated cake is high and extremely high. A dehydrated cake with low moisture content is obtained.

In addition, high-temperature fluid is introduced into the cylindrical body that forms the plate itself so that it is in equilibrium with the overpressure, so even if it is a hollow plate, it has pressure resistance, and compared to conventional plates, the plate It is possible to reduce the thickness considerably.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown, the plate 1 of the filter press is
It has a structure in which a large number of hollow cylindrical bodies 2 are arranged in parallel, and among the cylindrical bodies 2, the cylindrical bodies 2 located on both sides
is formed to have a large diameter, so that when the plates 1 are closed via the cloth 3, a chamber 4 is formed between each plate 1.

In each of the cylinders 2, through-holes 5 communicating with the adjacent cylinders 2 are formed alternately in the upper and lower directions to provide a passage 6 inside the plate 1, into which a high-temperature fluid 9 such as steam is introduced. This high-temperature fluid 9 may be introduced during dewatering of sludge, or may be introduced after completion of dewatering. When introducing high-temperature fluid 9 during sludge dewatering, the high-temperature fluid 9 is introduced so that the same pressure as the overpressure is applied in the passage 6.
By introducing this, sufficient pressure resistance can be obtained even with a hollow plate. This high temperature fluid 9 is
By using waste heat from water treatment facilities, etc., equipment costs can be reduced. Further, the temperature of the high temperature fluid 9 is usually 150°C, considering the heat resistance temperature of cloth, etc.
The limit is around ℃.

As mentioned above, by introducing the high temperature fluid 9 into the passage 6 inside the plate 1, the plate 1 and the cloth 3
The dehydrated cake 7 is heated through the
The moisture content of the dehydrated cake 7 can be significantly reduced by sequentially drying the surface of the cake. At this time, the liquid and dry evaporated gas are discharged from the liquid discharge groove during dehydration, and after the dehydration by the filter press is completed, they are discharged from the gap 8 formed between the cloth 3 and the surface of the plate 1. . In addition, when this dry evaporated gas is sucked by a blower, the dehydrated cake 7
drying efficiency is improved.

〔Effect of the invention〕

As described above, the plate of the present invention is formed of a hollow plate having a continuous cylindrical body, so that the weight of the plate can be reduced.

In addition, by introducing high temperature fluid into the cylindrical body itself forming the plate, heating efficiency is extremely good. This reduces the viscosity of the sludge and improves the dewatering efficiency. Furthermore, since the dehydrated cake dries from the surface side, the dehydrated cake can be easily peeled off from the cloth and has the effect of preventing the cloth from getting dirty.

[Brief explanation of the drawing]

FIG. 1 is a partial longitudinal cross-sectional view showing one embodiment of the present invention, and FIG. 2 is a cross-sectional view of the same. 1...Plate, 6...Fluid passage, 9...High temperature fluid.

Claims (1)

[Claims] 1. A hollow plate is formed by arranging a large number of hollow cylindrical bodies in parallel, and in each cylindrical body forming this hollow plate, through-holes communicating with the adjacent cylindrical bodies are formed alternately above and below to form inside the hollow plate. A filter press plate in which a high-temperature fluid is introduced into the fluid passage so that the internal pressure of the hollow plate and the overpressure are approximately balanced.