Filtering device matched with suspension filter for use

Abstract

The utility model relates to a filtering device matched with a suspension filter for use. The filtering device comprises an observation port, a filter screen and a filter screen, the O-shaped sealing ring is mounted at the upper part of the filtering device; the liquid inlet is positioned on one side of the filtering device and is used for being connected with an overflow port of the suspension filter; the liquid outlet is formed in the other side of the filtering device; the drain outlet is formed in the bottom of the filtering device; the filter basket is arranged in the filter device and is provided with an inclined upper opening, the upper opening obliquely faces the liquid inlet, and a filter screen of the filter basket covers the liquid outlet. According to the filtering device, a worker can find the fault of the suspension filter in time, and the filtering material can be successfully intercepted, so that the subsequent acid making process is prevented from being influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of acid production from smelting flue gas, in particular to a filtering device used in conjunction with a suspension filter. Background Art

[0002] The statements in this section are merely intended to provide background information related to the technical solution of the present application to aid understanding, and they do not necessarily constitute prior art with respect to the technical solution of the present application.

[0003] The acid production system using smelting flue gas to produce acid includes four major processes: purification, dry absorption, conversion, and tail absorption. Among them, the purification process is responsible for washing, cooling, and dust removal of the flue gas. Most acid production systems use wet washing technology with ideal washing, cooling, and dust removal effects.

[0004] This technology primarily consists of a turbulent scrubber, a scrubber, a cooling tower, and an electrostatic precipitator. By placing circulating acid in countercurrent contact with the high-temperature flue gas generated by the smelting process, harmful metals such as dust, arsenic, and fluorine are removed from the flue gas. Impurities enter the circulating acid, causing the H2SO4 concentration, temperature, and dust content in the circulating acid to gradually increase, reducing scrubbing efficiency. To achieve this, the circulating acid must be partially open-circuited, supplemented with an equal amount of fresh water to reduce the circulating acid concentration and dust content to maintain normal system operation. This results in the generation of large quantities of acidic wastewater. The circulating acid, from the back end to the front, gradually transfers a small amount of acid sludge from the two rear-end towers to the turbulent scrubber. The turbulent scrubber pumps the acid into the degassing tower, where SO2 gas is removed from the acidic wastewater. The acid then enters a suspension filter for coarse filtration, followed by fine filtration in a filter press. The filter cake is then returned to the pyrometallurgical system for treatment, thereby removing the acid sludge from the acidic wastewater. Acidic wastewater enters the filter media layer of the suspension filter for filtration. The filter media is generally made of modified expanded ethylene with a diameter of 1.0mm to 2.0mm, which has a large specific surface area and can absorb and intercept large particles of suspended solids. After being filtered by the filter cap on the top filter plate, the supernatant overflows from the overflow port into the clear liquid tank, thus playing a filtering role. During this process, as the dust content in the flue gas increases, the suspension filter cap may become clogged or fall off, or the top filter plate may become damaged. In this case, the suspension filter media will be discharged from the overflow port along with the supernatant at the detached filter cap or damaged filter plate. This will not only lead to poor filtration effect and turbid clear liquid, but also cause a large amount of filter media to enter the acid production system, affecting the normal production of the subsequent process. Utility Model Content

[0005] The purpose of the present invention is to provide a safe and simple filtering device for use with a suspension filter, which is used to prevent the filter material of the suspension filter from being discharged into the acid making system in large quantities from the overflow port along with the supernatant at the place where the filter cap falls off or the filter plate is damaged.

[0006] The purpose of this utility model is achieved through the following technical solutions.

[0007] A filter device used in conjunction with a suspended filter, characterized in that it includes: an observation port located at the upper part of the filter device; an O-ring installed at the upper part of the filter device; a liquid inlet located on one side of the filter device, which is used to connect with the overflow port of the suspended filter; a liquid outlet located on the other side of the filter device; a sewage outlet located at the bottom of the filter device; a filter basket installed inside the filter device, which has an inclined upper opening, the upper opening is inclined toward the liquid inlet, and the filter screen of the filter basket covers the liquid outlet.

[0008] In one embodiment, the pore size of the filter mesh of the filter basket is smaller than the diameter of the filter media in the suspension filter.

[0009] In one embodiment, the O-ring is connected to the observation port via a flange.

[0010] In one embodiment, the filter basket is cylindrical.

[0011] During operation, the overflow outlet of the suspension filter is connected to the associated filtration unit via a pipe. The supernatant flowing out of the suspension filter enters the associated filtration unit through the filtration unit's inlet and is discharged into the clear liquid tank through the filtration unit's outlet. When filter media from the suspension filter, caused by a detached filter cap or damaged filter plate, is discharged from the overflow outlet along with the supernatant, it will not enter the subsequent acid production process and will be intercepted in the filter basket of the filtration unit. All components of the filtration unit are constructed of dilute acid-resistant materials to prevent corrosion from acidic wastewater.

[0012] During regular inspections, if operators discover filter material in the filter basket of the filter device through the observation port, they can promptly determine that the filter cap of the suspension filter has fallen off or the filter plate is damaged. They can then isolate the suspension filter, open the side manhole, replace or install a new filter cap, or repair the damaged filter plate. Before operating the suspension filter, drain the liquid in the filter device through the drain port, open the observation port, remove the filter basket, clean out the filter material, add an O-ring, and connect it to the observation port through the flange. The matching filter device can then be restored.

[0013] The filtering device used with the supporting suspension filter of the utility model can not only enable the staff to discover the failure of the suspension filter in time, but also successfully intercept the filter material in the event of a failure, so as to avoid affecting the subsequent acid production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The following further describes the embodiments of the present invention with reference to the accompanying drawings, wherein:

[0015] Figure 1 A schematic diagram of a filtration device used with a suspension filter according to one embodiment;

[0016] Figure 2 FIG. 4 is a flow chart of a filtering process according to one embodiment. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] Figure 1 A filter device 7 for use with a suspended filter according to one embodiment is shown. The filter device 7 includes an observation port 1 located at the top of the filter device 7, a filter basket 2 mounted within the filter device 7, an O-ring 3 mounted at the top of the filter device 7, a liquid inlet 4 located on one side of the filter device 7, a liquid outlet 5 located on the other side of the filter device 7, and a sewage outlet 6 located at the bottom of the filter device 7. The liquid inlet 4 of the filter device 7 is configured to connect to the overflow port of the suspended filter. The filter basket 2 can be cylindrical and have an inclined upper opening that tilts toward the liquid inlet 4. The filter screen of the filter basket 2 covers the liquid outlet 5.

[0019] Figure 2 A flow chart of a filtration process according to one embodiment is shown. The overflow liquid outlet of the suspension filter is connected to a matching filter device through a pipeline. The supernatant overflowing from the suspension filter enters the matching filter device 7 through the liquid inlet 4 of the filter device 7 and is discharged into the clear liquid tank from the liquid outlet 5 of the filter device 7. When the filter material of the suspension filter is discharged from the overflow port along with the supernatant from the detached filter cap or damaged filter plate, the filter material will not enter the subsequent acid production process and will be intercepted in the filter basket 2 of the filter device 7. All components of the filter device 7 are made of dilute acid-resistant materials to prevent corrosion by acidic wastewater.

[0020] During regular inspections, if the operator finds filter material in the filter basket 2 through the observation port 1 of the filter device 7, it can be determined in time that the filter cap of the suspension filter has fallen off or the filter plate is damaged, and the suspension filter can be isolated, the side manhole can be opened, and a new filter cap can be replaced or installed or the damaged filter plate can be repaired.

[0021] Before the suspension filter is operated, the liquid in the matching filter device 7 can be drained through the drain port 6 of the filter device 7, the observation port 1 can be opened, the filter basket 2 can be taken out, the filter material can be cleaned out, the O-ring 3 can be added and connected to the observation port 1 through the flange, and the matching filter device 7 can be restored.

[0022] The filtering device used with the supporting suspension filter of the utility model can not only enable the staff to discover the failure of the suspension filter in time, but also successfully intercept the filter material in the event of a failure, so as to avoid affecting the subsequent acid production process.

[0023] References herein to "various embodiments," "some embodiments," "one embodiment," or "an embodiment" refer to a particular feature, structure, or property described in connection with the embodiment as being included in at least one embodiment. Thus, the appearances of the phrases "in various embodiments," "in some embodiments," "in one embodiment," or "in an embodiment" throughout this document do not necessarily refer to the same embodiment. Furthermore, particular features, structures, or properties may be combined in any suitable manner in one or more embodiments. Thus, particular features, structures, or properties shown or described in connection with one embodiment may be combined, in whole or in part, with features, structures, or properties of one or more other embodiments without restriction, as long as the combination is not illogical or inoperable. Expressions such as "according to A," "based on A," "through A," or "using A" as used herein are intended to be non-exclusive, meaning that "according to A" may include "according only to A" or "according to A and B," unless specifically stated to mean "according only to A." For clarity, exemplary operational steps are described in a certain order throughout this application, but those skilled in the art will appreciate that not all of these operational steps are essential, and some of these steps may be omitted or replaced by other steps. These operation steps do not have to be executed sequentially in the manner shown; on the contrary, some of these operation steps can be executed in different orders or in parallel according to actual needs, as long as the new execution manner is not illogical or inoperable.

[0024] Having thus described several aspects of at least one embodiment of the present invention, it will be appreciated that various changes, modifications, and improvements will readily occur to those skilled in the art. Such changes, modifications, and improvements are intended to be within the spirit and scope of the present invention. While the present invention has been described with reference to certain embodiments, the present invention is not limited to the embodiments described herein and encompasses various changes and variations that may be made without departing from the scope of the present invention.

Claims

1. A filtering device used in conjunction with a suspended filter, characterized in that: include: An observation port (1) located at the upper portion of the filter device; An O-type sealing ring (3) installed on the upper part of the filtering device; A liquid inlet (4) located on one side of the filtering device, which is used to be connected to the overflow port of the suspension filter; a liquid outlet (5) located on the other side of the filtering device; A sewage outlet (6) located at the bottom of the filtering device; A filter basket (2) installed inside the filter device has an inclined upper opening, the upper opening is inclined toward the liquid inlet (4), and the filter screen of the filter basket (2) covers the liquid outlet (5).

2. The filtration device used with the supporting suspension filter according to claim 1, wherein: The pore size of the filter screen of the filter basket (2) is smaller than the diameter of the filter material in the suspension filter.

3. The filtration device used with the supporting suspension filter according to claim 1, wherein: The O-type sealing ring (3) is connected to the observation port (1) via a flange.

4. The filtration device used with the supporting suspension filter according to claim 1, wherein: The filter basket (2) is cylindrical.

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