JPS6018202B2 - Furnace filtration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for cleaning a furnace, in particular a horizontally arranged furnace element for removing spent furnace cake from the furnace element or diaphragm. It relates to a mechanical device used in a filtration device having a filtration system.

(first dissolved or suspended in a liquid)
Various types of filtration equipment exist for purifying liquids by removing solid particles and chemical contaminants and for recovering recyclable materials from the liquid.

A mechanical filtration device utilized as a support for the chemically adsorbing or absorbing material so that the solids and chemical contaminants are adsorbed or absorbed by the surface of the material during the flow of liquid. are used in the above devices; however, when the contaminants are removed from the liquid, these materials deposit as sludge on the surface of the filter, impeding the flow of the liquid. Furnace material or cake must be removed from the supporting screen or furnace diaphragm, as it can block and possibly clog the furnace. Such filtration devices therefore include brushes, scrapers and/or injectors for mechanically removing filtration material or filtrate cake and sludge from the diaphragm or screen. Various furnace cleaning devices are used, such as:

Other methods applied to remove spent filtration cake and sludge from filtration elements, filtration plates or circular filtration tubes include vibration and backwash liquids, i.e. filtration. It is conceivable to flow the liquid back through the element. However, backflow rice bran is harmful to the furnace and significantly reduces its lifespan.
This is because the fine mesh screen diaphragm supported on the low-pressure side, which constitutes most furnace filtration devices, expands and easily deforms when pressure is applied from the low-pressure side. In many applications where the flow rate through the furnace is low, the problem of the filter cake falling off the diaphragm can be avoided if the furnace is used in a vertical orientation. There is a direction.

Therefore, such applications require the use of horizontally oriented furnace elements, which are difficult to clean by vibration or backwashing. If such a horizontal filter is rotated at high speed to remove spent filter cake and mud channels by centrifugal force, from the supporting material,
The diaphragm is peeled off together with the spent furnace cake, so that the operation has to be interrupted in order to replace the furnace element. If the filter cake is tightly bound to the diaphragm, centrifugal force will not allow the entire cake to be removed, so if the diaphragm is subsequently coated. , a non-uniform cake will be formed. In addition, when brushes and scraping devices are used on a horizontally arranged furnace, when the furnace is rotated with respect to these brushes extending in the radial direction, the furnace Cake and sludge build up not only create frictional forces that prevent further movement, but also create a downward force on the furnace screen, which tends to permanently damage the furnace screen. Alternatively, it has been found that there is a risk that the filter cake may be forced to penetrate the corneal membrane and contaminate the purified liquid.

That is, as a result, the purification effect becomes unsatisfactory. The above-mentioned methods have low efficiency and do not keep the outer surface of the furnace element completely clean over long periods of time, resulting in fouling or clogging of the diaphragm.

Even if the filtration equipment were only partially purified, the efficiency of the filtration process and the length of time that the filtration device would remain in service would be significantly reduced. The present invention is particularly directed to a device for cleaning a furnace element in a furnace having a horizontally arranged furnace surface rotating about a central axis.

According to the present invention, used filtration cake and Accumulated solid particles and chemical contaminants are evenly and completely removed.
The present invention provides for supporting a mechanical cleaning device comprising one support arm at an angle opening in the direction of rotation relative to the radii extending from the central axis around which the furnace element is rotated; The secondary method is achieved by extending the cleaning device across and parallel to the surface of one furnace, with a flexible brush mounted on the arm engaged with the surface of the furnace. Overcoming the shortcomings of. When the furnace element is rotated against the brush, the spent furnace cake and mud are pulled away from the mesh or diaphragm and swept outwardly from the furnace element and dropped. . This cleaning device wipes away any material that could clog the mesh of the furnace element, thus
It prevents any inorganic or organic substances in the form of flocs, particulates, or colloids from accumulating on the mesh and thus reducing the efficiency of the filter. By arranging the support arm of the cleaning device at an angle that is open in the direction of rotation with respect to the radii extending from the central axis of rotation of the furnace element, said arm and its associated brush are provided with the support arm of the furnace element. While rotating, create force to scoop the cake from the oven. Thus, by arranging the cleaning device and by advantageously curving the support arm, an outwardly directed force is created which sweeps the sludge from the center of the furnace element towards the outer edge. is pushed out and dropped to the bottom of the furnace for disposal. This motion is particularly important in horizontal furnaces where gravity is not available to remove the sludge from the top of the furnace element. If the brushes are mounted radially about the center of rotation of the furnace element, the dislodged cake and mud will stick to the arms and brushes and bridge them, thereby increasing the This would prevent rotation of the device and possibly damage the mesh screen or corneal membrane.

Accordingly, an object of the present invention is to effectively and efficiently remove spent furnace cake and sludge from the furnace surface of a furnace element without damaging the furnace element itself.

Another object of the present invention is to wipe away the pig-like or colloidal suspension from the surface of the furnace element to assist in the subsequent formation of a furnace cake on the furnace element, and to This is to avoid clogging.

Yet another object of the invention is to provide a generally movable sludge disposed tangentially with respect to the axis of rotation of the furnace element so as to guide the sludge removed during cleaning towards the outer edge of the furnace element. The purpose is to provide a furnace brush.

It is a further object of the present invention to provide a curvilinear configuration which reduces stress in the filtration element and which aids in the removal of spent filtrate cake and sludge from the surface of the filtration device during cleaning by the brushes. The purpose of the present invention is to provide a furnace overbrush that has been manufactured using the following methods. Next, the functions and effects of the present invention will be explained in more detail with reference to the drawings showing embodiments of the present invention.

In FIG. 1, reference numeral 10 schematically depicts a portion of a furnace including the furnace cleaning device of the present invention.

This furnace 10 includes a horizontal furnace mechanism 12 installed in a furnace chamber 11, and this mechanism includes a hollow central mounting section and a furnace tube 14 extending generally vertically. The furnace tube has a series of vertically spaced ports 15 formed around its periphery. Mounted on the furnace tube 14 are a plurality of radially extending, relatively flat furnace elements 18 in vertically spaced relationship. The inside of each of the above-mentioned furnace elements is lined up with a set of open rows 5 on the circumference. The furnace element 18 is maintained in this relationship by the interposition of a spacer 16 mounted on and adjacent the furnace tube 14. A spray intake port 13 is arranged near the periphery of the furnace element 18 . This introduction includes a vertical column having a certain number of injection ports 19, from said injection ports 19 to each furnace element 18 and cleaning device 40;
Purified liquid is injected. This will be explained in more detail later. In general, unpurified liquid entering the horizontal filtration mechanism 12 through a suitable intake (not shown) is purified by a horizontally disposed filtration element 18, and then passes through the sekiguchi 15. Flow into the cavity of the furnace tube 14 to a furnace outlet (not shown) and recirculation from said outlet according to the particular phase during the furnace cycle in which the furnace is operating. removed, disposed of, or directed to precoating equipment.

A complete disclosure of the filtration apparatus to which the present invention may be applied is found at 197
The method is described in detail in Application No. 448,493, entitled "Method and Apparatus for Liquid-Solid Separation," filed in the United States on March 6, 2013. The above-mentioned hollow furnace tube 14 is rotatably mounted in a bearing casing sealed at both its upper and lower ends, so that the furnace cake becomes spent and the furnace is removed from the furnace. When cleaning is desired, it can be rotated together with the furnace element.

Each furnace element 18 is mounted coaxially upstream of one of the aforementioned furnace tubes and is separated from adjacent elements by a spacing piece 16.

Each spacer 16 has an outwardly facing groove 17 formed therein to receive a support ring 46, as will be explained below. Each furnace element is made of flat sheet material or large mesh folded into an accordion shape radiating outward from the center of the element and sloping to a point at the outer edge. Support mechanism 2
Contains 0. This support mechanism is made of fine silk or diaphragm 2.
2 to support the top cake surface 23 of the furnace formed on the membrane. The mesh size of the fine screen or diaphragm 22 covering the support structure 20 can be varied according to the size of the particular solid particles suspended in the liquid being heated. Since the lower side of the furnace element 18 is closed by the internal metal plate 26, the liquid that is forced to flow down through the upper furnace surface 23 of the furnace element 18 flows into the furnace tube 14. It flows radially inward towards the closure 15. The above-mentioned Sekiguchi 15 and the inside of the furnace element are individually arranged in the vertical direction to form a lotus state. The metal plate 26 is bent upward and compressed onto the bulkhead 22 to be restrained, or is joined to the silk by the U-shaped green part 25, and then attached to the furnace element 18.
The outer periphery of the tube can be sealed. In many applications, the furnace tube 14 is rotated with the furnace tube 14 in response to a drive (not shown) coupled to the furnace tube 14 to impart rotation to the device. Several furnace elements 1 are placed between adjacent spacing pieces 16 provided around the
8 is placed on a rhombus. According to known measures, the upper surface of the furnace element 18, ie the diaphragm 22, is precoated with an additional substance, such as diatom.

This additional material interacts with the water to form a filter cake 23 on the diaphragm 22. The furnace cake 23 creates very fine voids that allow the passage of liquids but prevent the passage of solids and other contaminants, which deposit on the furnace cake. When sufficient solids have accumulated, i.e., when the pores of the furnace cake 23 are clogged to the extent that the furnace efficiency is reduced, the accumulated material and its use may be removed for further processing or disposal. It is necessary to remove the finished furnace cake. As mentioned above,
Currently, especially when horizontal filtration equipment is used,
Removal as described above was a problem. In the present invention, a plurality of cleaning devices are provided which correspond in number to the furnace element 18 used and are arranged to extend across the top surface of the furnace element 18 and substantially parallel thereto. The above removal is carried out depending on the four rivers.

Each cleaning device 40 includes an arm portion 42 that is mounted at its inner end on a support ring 46 . The support ring 46 is mounted in a groove 17 formed in the spacing piece 16 described above. Unlike the conventional furnace filter Sakaki, the cleaning device 4
As shown in FIGS. 3 to 5, the inner end of the arm portion 42 of No. 0 is mounted in such a way that the protrusion at the intersection does not pass through the central axis of the furnace element. Since the support ring is coaxial with the furnace element, the spacing piece, and the bag tube, the cleaning device 4
0 is the same with respect to the central axis of these elements, and
As shown, it is disposed tangentially to the support ring 46. Each cleaning device extends obliquely from the central axis of each furnace element 18, ie, at an angle rather than parallel to the radial line. The inner end of the arm portion 42 of each cleaning device 40 may be rigidly attached by butt welding to the outer periphery of the support ring 46. The opposite end of the arm portion 42 abuts a vertical stop bar 48 located beyond the outer edge of the furnace element, which prevents movement of the cleaning device 40 during rotation of the furnace element. ing. In an advantageous embodiment of the invention, the arm portion 42 of the cleaning device 40 is curved. Such a configuration allows rapid removal of a mass of filtrate cake and filtrate material from the surface of the filtration element 18 and is therefore generally carried out by the use of brushes extending radially from the rotating shaft. as would occur,
It has been found that the destructive forces due to the accumulation of furnace cake and furnace material are not exerted on the diaphragm 22, which is a weak mesh screen. It should be noted that the complete removal of used furnace cake and sludge, which is made possible by the use of the curved cleaning device of the present invention, is achieved by completely cleaning the corner membrane for furnace filtration, and then removing the spent furnace cake and sludge. It also makes it possible to remove pig-shaped foreign objects that would clog the mesh 22 of the over-element. Such a removal action is achieved by attaching ports 43 on both sides of the arm portion 42 of the cleaning device 40.
This is carried out mechanically by means of a number of brush fibers or bristles 44 which are fixed to the brush arm 41 and which are attached to the brush arm 41. The present invention, having a cleaning device carried at an angle rather than parallel to the radii from a central axis, overcomes the failure of conventional devices using radially arranged brushes and scrapers. It is believed that the reason why the horizontal furnace element was successfully cleaned completely can be best explained with reference to FIG. 5 as follows.

As the overheating process progresses, a group or layer of spent cake and accumulated sludge 23 forms on the diaphragm 22 of the overheating element 18.

For purposes of explanation, let us now assume that the layer is comprised of a variable number of units (eg, 50) located at various radial distances (eg, n) from the central axis of the furnace element 18. In order to remove these mass wastes, the furnace element 18 is rotated at a certain angular velocity in relation to the cleaning device 4. Expressed linearly, each group of furnace cakes exerts a vector force Fx on the cleaning device at each radial unit distance, and this force is counteracted by the cleaning device. . The above force Fx can be decomposed into one orthogonal force FN and one tangential force Ft at each point. The force FN is the force applied to the cleaning device passing through the center of curvature, and the force Ft is the force applied to the cleaning device by a unitary mass at the point of contact with the cleaning device, i.e. , the force applied at the contact point in a direction perpendicular to the radius of curvature of the cleaning device. The force FN at each point is
The force Ft applied to the single mass by a cleaning device and used to remove or draw the mass from the furnace diaphragm is Along the cleaning device, exerting an eccentric force on said mass so as to be removed from the furnace element outward from the center of rotation, and on the diaphragm, along the front of the cleaning device, the furnace cake and the furnace material are deposited. This is a force that acts to avoid damage that may be done to the corneal membrane as a result. The angle between the side tangent of the cleaning device and the radial line from the central axis varies, and the angular variation causes the filtrate cake and filtrate material to move in the radial direction from the central axis. The variation is such that the component of the force acting outwardly is sufficient to clean the surface to which it is attached before it begins to deposit from these materials closer to the central axis.

Therefore, it is believed that because of the unique curvilinear configuration of the cleaning device, which opens in the direction of rotation of the furnace element, the outward component force Ft pushing the deposited mass outward is greatest at the outer edge of the furnace element 18. It will be done.

When the filtration element is rotated for cleaning, the curvilinear cleaning device exerts a scooping force on the filtration cake.
In the best case, the radius of curvature of cleaning device 40 should be such that Ft is approximately equal to or greater than FN at each point along it. The degree of curvature of the cleaning device must also be determined by the typical amount of filter cake and sludge to be removed in a particular application. In that case, the degree of curvature increases with the amount and with the speed of rotation of the furnace element. The straight section 42 of the arm also performs the same function as the curved arm, but if this section is supported at an angle with respect to the radii of the furnace element and is open in the direction of rotation. For example, the force Ft pushing a group of mud groove particles outward at specific points is
Straight brush brushes are not as effective as achieving the desired effect because the forces produced by using curved brushes are not as great.

In either type of cleaning device, the device is positioned at an angle to the radii in an open position in the direction of rotation of the furnace element, making an acute angle with the outer edge of the surface of the furnace element. Therefore, when the furnace element is rotated in the opening direction of the cleaning device, a flow of sludge is created toward the outer edge of the furnace and the outer wall of the furnace, and the mud bay is is removed from the furnace, allowing it to fall to the bottom of the furnace for disposal. As shown in FIGS. 7 and 8, the bristles 44 provided on both sides of the arm portion 42 of the cleaning device 40 are
It may also be replaced by opposing continuous, steerable wiper blades 58 strung above and below the arm portion 42' of the cleaning device 40' for engaging the surface of the barbed furnace element.

This wiper 58 is made of a material commonly called Teflon (registered trademark), which has a high inherent lubrication effect and is easy to clean.
It may be made from a suitable material such as polytetrafluorethylene. The bristles 44 are preferably made of a synthetic fiber, such as nylon, that is strong, elastic, and easy to keep clean.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a portion of a furnace having horizontally arranged furnace elements cut away to show the structure and orientation of the cleaning device of the invention with respect to the device; FIG. FIG. 3 is an enlarged sectional view showing a part of the furnace element and the cleaning device of the present invention shown in FIG. 1; FIG. 3 is a plan view showing the furnace element and the cleaning device of the present invention; 5 is a simulated diaphragm representing typical forces applied to the cleaning device of the present invention during operation; FIG. 6 is a plan view of the cleaning device of the present invention; and FIG. 6 is a plan view of the cleaning device of the present invention. 7 is a side view of an alternative cleaning device of the invention, and FIG. 8 is a vertical sectional view of the cleaning device of FIG. 7. In the figure, 10... represents a part of the furnace filtration device including the cleaning device of the present invention, 11... the furnace filtration chamber, 12.
...Horizontal furnace filtration mechanism, 13...Spray intake port, 1
4...Furnace tube, 15...Closed, 16...
・Spacer piece, 17...Front groove, 18...
・Furnace element, 19... Injection open □, 20...
Support mechanism, 22...diaphragm, 23...furnace cake, 25...U-shaped green part, 26...
・Metal plate, 40, 40'...Cleaning device, 41・
...Brush arm, 42, 42'...Arm part,
44...Bristles, 46...Support ring, 48...
...Stopping rod, 58...Fashionable wiper blade. F Yu-Ki-8- 。も。〔〕-〕-〕-〕〕〕〕〕〕〕〕〕〕〕〕〕〕〕〕〕〕〕〕〕〕〕〕〕〕〕〕〕〕〕〕〕〕-7−

Claims (1)

[Claims] 1. A filtration apparatus having a series of filtration elements and means for cleaning the filtration elements to remove spent filter cake, each filtration element being arranged horizontally in a stacked manner;
and is rotatable integrally with the central shaft, and a plate is attached to the lower surface of each filter element for receiving liquid and guiding the liquid into said central shaft for discharge;
a curved cleaning device including an arm portion that traverses each filter element from a central axis to a peripheral edge of the filter device; and a brush mounted on the arm portion and engaged with an upper bare surface of the filter element; The cleaning device is arranged such that the line of engagement between the cleaning device and the filter element defines an acute angle in the direction of movement of the filter element with respect to an outwardly directed radial line starting from the point of engagement. A filtration device formed therein and further comprising means for dispensing purified liquid onto the surface of each filtration element.