KR20050003926A - Membrane plate for filter press and dryer - Google Patents

Abstract

PURPOSE: To provide a membrane plate which is constructed in such a structure that steam or hot water passes through the membrane plate by forming a membrane plate having a dewatering function using a material having durability at high temperature so that the membrane plate is capable of performing dewatering and drying operation. CONSTITUTION: The membrane plate(20) for filter press type dryer comprises a plate body part(40) comprising a first surface, a second surface facing the first surface, and a hole(46) for entering and exiting a waste solution, wherein the hole passes through the first surface and the second surface; an elastic membrane(42) assembled into a groove formed on the outer wall of the first surface and the second surface of the plate body part; and a filter cloth(50) for surrounding the plate body part and the membrane to filter solid from the waste solution, wherein the plate body part is stepped downward from the first surface and the second surface to the inner side of the plate body part so that solid of the waste solution gathers in the plate body part, the plate body part is manufactured in a rectangular plate shape such that empty holes(47) are formed between the plate body part and the membrane assembled, and the plate body part comprises a hole for entering and exiting a waste solution, the hole passing through the first surface and the second surface of the plate body; first holes(41) which pass through the first surface and the second surface of the plate body to discharge filtrate and form vacuum; second holes(43) formed on the plate body adjacently to the first holes and connected to the first holes; and third holes(45) which are connected to the empty holes between the plate body and the assembled membrane from facing outer surfaces of the plate body, through one hole of which steam or hot water is supplied, and through the other hole of which steam or hot water is discharged.

Description

Membrane plate for filter press and dryer}

The present invention relates to a membrane plate for a filter press type dehydration dryer for vacuum drying the collected solid components by filtration and dehydration of a waste liquid mixed with a solid and a liquid.

The filter press is one of the oldest dewatering devices and includes a plurality of membrane plates. Such filter presses are used for water treatment, sewage / wastewater treatment, food processing, paper pulp, petrochemicals, chemicals (dyes, pigments, pharmaceuticals) and hazardous substances. There is a limit to remove the moisture of the solids by a certain amount of the rubber membrane having elasticity is coupled to the membrane and expands the membrane by supplying water or air between the main body and the membrane to pressurize and dehydrate the solids collected in the chamber.

Therefore, an object of the present invention is to provide a membrane plate to perform drying until the material of the membrane plate to perform only dehydration according to the prior art using a material of high temperature durability to pass steam or hot water into the plate.

1 is a schematic view showing a filter press type dehydration dryer according to an embodiment of the present invention;

2 is a partial cutaway perspective view showing the membrane plate of FIG.

3 to 5 are diagrams showing the dehydration drying process of the waste liquid using the filter press type dehydration dryer of FIG.

3 is a partial cross-sectional view showing a filtration process;

4 is a partial cross-sectional view showing a dehydration process;

5 is a partial cross-sectional view showing a drying process.

Description of the main parts of the drawing

10: press body portion 12: female room

20: membrane plate 30: plate fixing plate

40 plate body 41 first hole

42: membrane 43: the second hole

45: third hole 46: waste liquid inlet and outlet

47: hollow 50: filter cloth

60: waste liquid supply part 62: waste liquid supply pipe

70: filtrate discharge portion 72: filtrate discharge pipe

80: steam or hot water supply unit 82: steam or hot water supply pipe

84: steam or hot water discharge pipe 90: vacuum supply

100: filter press type dehydration dryer

In order to achieve the above object, a filter press type dehydration dryer membrane plate having a first surface and a second surface opposite to the first surface, the plate having a waste liquid inlet and outlet formed through the first surface and the second surface Body part; A membrane having an elasticity coupled to a groove formed around the outer periphery of the first and second surfaces of the plate body and contracting and expanding by supplying steam (or hot water) and air; Surrounding the plate body and the membrane, and includes a filter cloth for filtering the solids in the waste liquid, The plate body portion is formed to be stepped downward inward from the first surface and the second surface so that the solids of the waste liquid, A first hole penetrating from the first surface to the second surface, and the filtrate is discharged to form a vacuum; A second hole formed in the plate body and the membrane adjacent to the first hole and connected to the first hole; And a third hole formed in a hollow between the membrane and the first and second surfaces of the plate at opposite upper and lower outer surfaces of the plate body, and steam or hot water is supplied through the third hole on one side and the other side. A third hole through which the steam or hot water is discharged through the third hole of the plate body, and through the third hole on the outer surface of the plate body, the steam or hot water is hollowed between the first and second surfaces of the plate body and the membrane. It provides a membrane plate for the dehydration dryer, characterized in that the drying through heat transfer to the solids in the chamber while expanding the membrane. The plate body according to the invention is made of polypropylene with high temperature durability and the membrane is made of EPDM rubber of high temperature durability.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the present invention.

1 is a schematic view showing a filter press type dehydration dryer 100 according to an embodiment of the present invention. Referring to FIG. 1, the filter press type dehydration dryer 100 includes a press main body 10, a waste liquid supply unit 60, a filtrate discharge unit 70, a steam or hot water supply unit 80, and a vacuum supply unit 90. It consists of.

The press main body portion 10 is a filtration, dehydration, and drying step, and is composed of a plurality of membrane plates 20 and a plate fixing plate 30 for fixing the membrane plates 20 on both sides. The plate fixing plate 30 fixes the membrane plate 20 during the filtration, dehydration, and drying process, and is separated from the membrane plate 20 after the drying process to dry the solid cake in the membrane plate 20. To be separated. Although not shown, the membrane plates 20 are transported by a shifting mechanism that separates the membrane plates 20 and the dry cake of the chamber is detached from the plate.

The waste liquid supply part 60 supplies the waste liquid to be filtered to the press main body part 10 at a predetermined flow rate and pressure.

The filtrate discharge part 70 discharges the filtrate except the solids filtered by the filter cloth of the membrane plate 20 from the waste fluid that has passed through the press body part 10 to the outside of the press body part 10.

The steam or hot water supply unit 80 is a means for supplying steam or hot water into the membrane plate 20, and supplies the steam or hot water supply to the membrane plate 20 in order to proceed with a drying process performed after the filtration and dehydration process. For example, it is preferable to use an industrial steam or hot water boiler as the steam or hot water supply unit 80.

In addition, the vacuum supply unit 90 makes the chambers between the membrane plates 20 in a vacuum state in a drying process so that the water vapor in the solid cake, which is dehydrated and filtered through the chambers, can be made at a low temperature. As the vacuum supply, it is preferable to use a vacuum system in which a condenser, a heat exchanger and a vacuum pump are combined together.

Here, the membrane plate 20 will be described in more detail with reference to FIG. 2 as follows. The membrane plate 20 surrounds the plate body portion 40, the membrane 42 assembled to the first and second surfaces of the plate body portion, and the plate body 40 and the membrane 42, in the waste liquid. It consists of the filter cloth 50 which filters a solid material.

The plate body portion 40 has a rectangular plate shape and has a first surface and a second surface opposite to the first surface, and a waste liquid inlet and outlet 46 is formed through the first and second surfaces. In the embodiment of the present invention, the waste liquid inlet / outlet 46 is formed at the center portion of the plate body portion 40, but may be formed at another portion of the plate body portion 40, for example, at the corner of one side or at the center portion of one side. .

In more detail, the plate body portion 40 is made of a plate made of polypropylene material of high temperature durability, and the waste liquid inlet and outlet holes 46 and the first to third holes 41, 43, and 45 are formed. Include. A groove is formed to assemble the membrane 42 around the outer periphery of the first surface of the body portion and the second surface opposite to the first surface, and the first surface of the plate body portion 40 so that the solids of the waste liquid may be solid. It is formed to be stepped downward inward from the second surface, and the hollow 47 is formed in the interior between the membrane 42 to be assembled. The first hole 41 penetrates from the first surface to the second surface of the plate body portion 40 to discharge the filtrate and serves as a passage for forming a vacuum. The first hole 41 is formed at the edge of the plate body portion 40. The second hole 43 is formed in the plate body portion 40 proximate the first hole 41 and is connected to the first hole 41 to provide a passage through which the filtrate can be discharged toward the first hole 41. do. In addition, the third hole 45 is formed to be connected to the inner hollow 47 of the plate body portion 40 at the opposite outer surface of the plate body portion 40. At this time, steam or hot water is supplied through the third hole 45 formed on one side of the plate body 40, and the third hole 45 on the other side corresponding to the third hole 45 on one side thereof is opened. It serves as a passage through which steam or hot water is discharged.

The filtration / dehydration / drying process using the filter press 100 having the membrane plate 20 having such a structure will be described with reference to FIGS. 3 to 5. 3 through 5, the same reference numerals refer to the same components.

First, as shown in FIG. 3, the filtration process is performed after setting the filter press 100. That is, a plurality of for example four membrane plates 20 are fixed by the plate fixing plate 30. At this time, the space between the membrane plate 20 and the membrane plate 20, that is, the filter chamber 12 is a space in which solids of the filtered waste liquid are accumulated. Meanwhile, in the embodiment of the present invention, the press body portion 10 is formed of four membrane plates 20, but the press body portion may be implemented with more membrane plates. In addition, the treatment capacity of the waste liquid is determined by the volume of the waste room determined by the size and the quantity of the membrane plate.

The waste liquid supply pipe 62 of the waste liquid supply part is installed at a position corresponding to the waste liquid inlet / outlet 46, and the filtrate discharge tube 72 is connected to the first hole 41 so that the filtrate or air flows out of the press main body part 10. To be discharged. The steam or hot water supply pipe 82 of the steam or hot water supply unit is connected to the third hole 45 on one side, and the steam or hot water discharge pipe 84 is connected to the third hole 45 on the other side. Meanwhile, in FIG. 4, the uniaxial third hole 45 is a third hole formed in the upper portion of the membrane plate 20, and the third hole 45 on the other side is a third hole formed in the lower portion of the membrane plate 20. .

Thus, the waste liquid is supplied in the state where the filter press 100 is set, and a filtration process is performed. That is, the waste liquid supplying the waste liquid having a predetermined flow rate to the membrane plate 20 through the waste liquid supply pipe 62. Among the waste liquid supplied to the membrane plate 20, the solid matter is caught by the filter cloth 50, and the filtrate passing through the filter cloth 50 passes through the second hole 43 and the first hole 41. Is discharged. Then, the waste liquid which is not filtered in the front membrane plate 20 is supplied to the neighboring membrane plate 20 through the waste liquid inlet and outlet pipe 46, and the filtration process is repeatedly performed. Subsequently, when the filtration process as described above proceeds, solid matter accumulates in the filter cloth 50, and finally, enough solid matter accumulates to fill the chamber 12 between the membrane plates 20. The result is a solid cake consisting of 25 to 45% solids.

Next, as shown in FIG. 4, a dehydration process is performed. That is, when the solid material is filled in the chamber 12, the pressure at the inlet of the waste liquid supply pipe 62 starts to increase, and when the sufficient injection pressure, for example, a pressure of 5 to 7 Kg / cm 2 is maintained, the inlet of the waste liquid supply pipe 62 is blocked. . At the same time, the compressed air is supplied to the hollow 47 through the steam or hot water discharge pipe 84 to inflate the membrane 42 to reduce the water content of the solid cake. Of course, the moisture removed from the solid cake is discharged to the filtrate discharge pipe 72 through the second hole 43 and the first hole 41. As a result, the moisture content of the solid cake in the filter chamber 12 can be lowered. The supplied compressed air is sucked out through the filtrate discharge pipe 72 and discharged out of the press main body 10 after the completion of the dehydration process and before the drying process starts.

Finally, as shown in FIG. 5, a drying process is performed. That is, in the state in which steam or hot water is provided through the steam or hot water supply pipe 82 following the dewatering process, the air is sucked through the filtrate discharge pipe 72 to apply a vacuum to the membrane plate 20. The solid cake in) is dried. The reason for applying the vacuum in this way is to allow the water evaporation in the solid cake to proceed at a low temperature, for example, a vacuum gauge pressure of 720 ± 20 mmHg, 40 ℃. In other words, by applying a vacuum to lower the vaporization temperature of the water in the solid cake, it is possible to remove water close to 100%.

The solid cake discharged after drying is variable depending on the drying time, but becomes a solid close to 100%, the volume is further reduced by 40 to 60% during the drying process.

On the other hand, the embodiments of the present invention disclosed in the specification and drawings are merely presented specific examples to aid understanding and are not intended to limit the scope of the present invention. In addition to the embodiments disclosed herein, it is apparent to those skilled in the art that other modifications based on the technical idea of the present invention may be implemented.

Therefore, according to the structure of the present invention, the membrane plate is formed of an elastic membrane that is assembled to the plate body portion and the body portion, and a hollow is formed between the plate body portion and the membrane to form a hollow through the side hole of the plate body portion As the membrane is inflated by the provided steam or hot water, the space between the membrane plates, that is, the drying process for the solid cake in the chamber can be performed. This is because the conventional membrane plate proceeds only to the filtration and dehydration process to remove the water from the solids in the room, and proceeds to the drying process, thereby significantly lowering the water content of the solids.

Claims (2)

Membrane plate for filter press dryer, A plate body portion having a first surface and a second surface opposite to the first surface, the plate body portion having a waste liquid inlet and outlet through the first and second surfaces; An elastic membrane assembled through the grooves on the outer periphery of the first and second surfaces of the plate body portion; And surrounding the plate body and the membrane, and a filter cloth for filtering solids from the waste liquid. The plate body portion, It is a rectangular plate shape that is formed to be stepped downward from the first side and the second side inward so that the solids of the waste liquid is solid, and a hollow is formed between the membrane to be assembled, A waste liquid inlet and outlet formed through the first and second side surfaces of the plate body; A first hole formed to penetrate from the first surface of the plate body to the second surface, and the filtrate is discharged to form a vacuum; A second hole formed in the plate body proximate to the first hole and connected to the first hole; And Steam or hot water is supplied through the third hole on one side to the third hole connected to the hollow between the plate body and the assembled membrane on the opposite outer surface of the plate body, and steam or hot water is supplied through the third hole on the other side. And a third hole which is discharged. Supplying steam or hot water to the hollow of the plate body through the third hole to expand the map brain assembled on the plate body to dehydrate / dry the solid material between the plates, characterized in that plate. The membrane plate of claim 1, wherein the plate body is made of polyprophylene-UHT of high temperature durability.