A backwash filter device for preventing the clogging of a gypsum cyclone

Abstract

This invention relates to the field of anti-clogging technology for gypsum hydrocyclones, and in particular to a backwashing filter device for preventing clogging of gypsum hydrocyclones. It includes a connecting pipe and a bypass pipe. The connecting pipe is sequentially provided with a first interface, a first pneumatic valve, a filter device, a second interface, a second pneumatic valve, and a third interface along the slurry flow direction. The connecting pipe is sequentially connected to the inlet of the bypass pipe through the first interface. The bypass pipe is sequentially provided with a third pneumatic valve and a fourth pneumatic valve. The outlet of the bypass pipe is connected to the connecting pipe through the third interface. The connecting pipe is connected to a first flushing pipe through the second interface. The first flushing pipe is provided with a fifth pneumatic valve. This invention not only filters the slurry entering the gypsum hydrocyclone but also automatically cleans the filter device during the operation of the gypsum dewatering system without shutting down the gypsum dewatering system, effectively solving the problem of easy clogging in gypsum hydrocyclones.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gypsum cyclone anti-blocking, in particular to a backwashing filter device for preventing gypsum cyclone from being blocked. BACKGROUND

[0002] The gypsum dewatering system is an important component of the whole wet desulfurization system, qualified gypsum slurry in the absorption tower is transported to the gypsum dewatering system by the gypsum discharge pump, and the gypsum slurry (containing solid content of 10% to 20%) is made into gypsum with water content of not more than 10% through the first-stage dewatering of the cyclone and the second-stage dewatering of the vacuum belt dewatering machine, while the material level of the desulfurization system is ensured during the whole dewatering process. The cyclone is an important equipment, as a separation and classification equipment, most of the coarse particles are discharged through the underflow port by using the principle of centrifugal sedimentation, and the fine particles are discharged through the overflow pipe, so as to achieve the purpose of separation and classification.

[0003] However, the cyclone in the existing gypsum dewatering system is prone to blockage, and a filter is usually arranged at the inlet of the gypsum discharge pump, but the filter is located in the absorption tower, and it is difficult to check the blockage or damage of the filter once the unit is started, and it is time-consuming and laborious to overhaul the filter, and the production process is also affected; the filter is prone to damage after long-time operation of the unit, and the impurities in the absorption tower are easy to enter the cyclone through the gypsum discharge pump, resulting in blockage of the cyclone. The blockage of the cyclone not only affects the efficiency of gypsum dewatering, but also reduces the separation effect, the water content of the coarse particles discharged through the underflow port increases when entering the vacuum belt machine, which leads to difficulty in dewatering and affects the quality of the subsequent gypsum. SUMMARY

[0004] The purpose of the present application is to provide a backwashing filter device for preventing the gypsum cyclone from being blocked, which can filter the slurry entering the gypsum cyclone, and can conveniently clean the filter device, saving manpower and material resources, and effectively solving the problem of easy blockage of the gypsum cyclone.

[0005] The present application provides a backwashing filter device for preventing the gypsum cyclone from being blocked, which comprises a connecting pipe and a bypass pipe, the inlet of the connecting pipe is connected with the outlet of the gypsum discharge pump, the outlet of the connecting pipe is connected with the inlet of the gypsum cyclone, and the connecting pipe is provided with a first interface, a first pneumatic valve, a filter device, a second interface, a second pneumatic valve and a third interface in sequence along the flow direction of the slurry;

[0006] The connecting pipe is connected with the inlet of the bypass pipe in sequence through the first interface, the bypass pipe is provided with a third pneumatic valve and a fourth pneumatic valve in sequence, the outlet of the bypass pipe is connected with the connecting pipe through the third interface to form a bypass, and the connecting pipe is connected with a first flushing pipe through the second interface, and the first flushing pipe is provided with a fifth pneumatic valve;

[0007] The first pneumatic valve, the second pneumatic valve, the third pneumatic valve, the fourth pneumatic valve and the fifth pneumatic valve are connected with a controller.

[0008] Preferably, a second flushing pipeline is connected between the third pneumatic valve and the fourth pneumatic valve, and a sixth pneumatic valve is arranged on the second flushing pipeline, and the sixth pneumatic valve is connected with the controller.

[0009] Preferably, a pressure transmitter and a flow transmitter are arranged between the connecting pipeline inlet and the first interface.

[0010] Preferably, the pressure transmitter and the flow transmitter are connected with the controller.

[0011] Preferably, the filter device comprises a filter device cylinder, a filter screen is arranged on the outlet side of the filter device cylinder, a blowdown pipeline is connected to the side of the filter device cylinder, the blowdown pipeline is located between the inlet side of the filter device cylinder and the filter screen, and a seventh pneumatic valve is arranged on the blowdown pipeline.

[0012] Preferably, the seventh pneumatic valve is connected with the controller.

[0013] Preferably, the filter device cylinder is connected with the connecting pipeline through flanges at both ends.

[0014] Preferably, the filter screen is a stainless steel punched filter screen.

[0015] Preferably, a material receiving groove is arranged at the outlet end of the blowdown pipeline.

[0016] Preferably, the controller is a PLC controller.

[0017] Beneficial effects:

[0018] The present application can not only filter the slurry entering the gypsum cyclone, but also automatically clean the filter device during the operation of the gypsum dewatering system by setting the backwashing filter device and using the controller to control, without stopping the operation of the gypsum dewatering system, thereby ensuring the production process and effectively solving the problem of easy blocking of the gypsum cyclone. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0021] BRIEF DESCRIPTION OF DRAWINGS

[0022] 1-absorption tower, 2-gypsum discharge pump, 3-connection pipe, 4-pressure transmitter, 5-flow transmitter, 6-first pneumatic valve, 7-second pneumatic valve, 8-third pneumatic valve, 9-fourth pneumatic valve, 10-fifth pneumatic valve, 11-sixth pneumatic valve, 12-seventh pneumatic valve, 13-bypass pipe, 14-first flushing pipe, 15-second flushing pipe, 16-blowdown pipe, 17-filter device cylinder, 18-filter screen, 19-receiving tank, 20-gypsum cyclone. DETAILED DESCRIPTION

[0023] The technical solutions of the present application will be described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0024] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0025] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited. In addition, the terms "mounting", "connecting", "connecting" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] Example 1

[0027] As Figure 1As shown, a backwashing filter device for preventing clogging of a gypsum hydrocyclone includes a connecting pipe 3 and a bypass pipe 13. The absorption tower 1 is connected to the inlet of a gypsum discharge pump 2. A filter can be installed at the inlet of the gypsum discharge pump 2. The outlet of the gypsum discharge pump 2 is connected to the inlet of the gypsum hydrocyclone 20 via the connecting pipe 3. The slurry in the connecting pipe 3 flows from the side of the gypsum discharge pump 2 to the gypsum hydrocyclone 20. Along the slurry flow direction, the connecting pipe 3 is sequentially provided with a first interface, a first pneumatic valve 6, a filter device, a second interface, a second pneumatic valve 7, and a third interface. A pressure transmitter 4 and a flow transmitter 5 are provided between the inlet of the connecting pipe 3 and the first interface. By monitoring the pressure transmitter 4 and the flow transmitter 5, the flow rate and pressure value of the gypsum slurry inside the connecting pipe 3 can be obtained, thereby determining whether the filter device is clogged.

[0028] Connecting pipe 3 is connected to the inlet of bypass pipe 13 via the first interface. A third pneumatic valve 8 and a fourth pneumatic valve 9 are sequentially installed on bypass pipe 13. The outlet of bypass pipe 13 is connected to connecting pipe 3 via the third interface, forming a bypass. A second flushing pipe 15 is connected between the third pneumatic valve 8 and the fourth pneumatic valve 9. A sixth pneumatic valve 11 is installed on the second flushing pipe 15. When the gypsum dewatering system is operating normally, the third pneumatic valve 8, the fourth pneumatic valve 9, and the sixth pneumatic valve 11 are normally closed.

[0029] The connecting pipe 3 is connected to the first flushing pipe 14 through the second interface. The first flushing pipe 14 is equipped with a fifth pneumatic valve 10. The other ends of the first flushing pipe 14 and the second flushing pipe 15 are both connected to process water and are kept in a normally closed state.

[0030] The filtration device includes a filter cylinder 17, both ends of which are connected to connecting pipes 3 via flanges. A filter screen 18 is installed on the outlet side of the filter cylinder 17. A drain pipe 16 is connected to the side of the filter cylinder 17, located between the inlet side of the filter cylinder 17 and the filter screen 18. A seventh pneumatic valve 12 is installed on the drain pipe 16. The filter screen 18 is a stainless steel perforated filter screen, which is strong, not easily broken, low in cost, and has a long service life. The filtration device consumes little water for cleaning, saving energy. A receiving trough 19 is provided at the outlet end of the drain pipe 16 to facilitate the collection of impurities discharged from the drain pipe 16.

[0031] The first pneumatic valve 6, the second pneumatic valve 7, the third pneumatic valve 8, the fourth pneumatic valve 9, the fifth pneumatic valve 10, the sixth pneumatic valve 11, and the seventh pneumatic valve 12 are connected to the controller. The pressure transmitter 4 and the flow transmitter 5 are also connected to the controller. The controller is a PLC controller. The controller can receive and process the information measured by the pressure transmitter 4 and the flow transmitter 5, and control the opening and closing of each pneumatic valve as needed. The controller is a commonly used device in this field and will not be described in detail here.

[0032] Work process:

[0033] When the gypsum dewatering system is working normally, the third pneumatic valve 8, the fourth pneumatic valve 9, the fifth pneumatic valve 10, the sixth pneumatic valve 11 and the seventh pneumatic valve 12 are normally closed. The gypsum slurry in the absorption tower 1 enters the gypsum hydrocyclone 20 through the gypsum discharge pump 2, the connecting pipe 3, the filter device cylinder 17 and the filter screen 18. The gypsum hydrocyclone 20 performs primary dewatering.

[0034] When pressure transmitter 4 and flow transmitter 5 detect that the flow rate of gypsum slurry inside connecting pipe 3 is lower than the set value or the pressure is higher than the set value, the filter device is blocked. The controller receives the information and adjusts the opening and closing of each pneumatic valve. The third pneumatic valve 8 and the fourth pneumatic valve 9 are opened, while the first pneumatic valve 6 and the second pneumatic valve 7 are closed. The gypsum slurry flows into the gypsum hydrocyclone 20 through the bypass pipe 13 without being processed by the filter device. The fifth pneumatic valve 10 and the seventh pneumatic valve 12 are opened, and process water flows into connecting pipe 3 through the first flushing pipe 14, flowing between the first pneumatic valve 6 and the second pneumatic valve 7 to achieve backwashing of the filter device. The impurities obtained from the flushing are discharged into the receiving tank 19 through the drain pipe 16 for easy recovery and subsequent processing. The flushing time is controlled by the controller.

[0035] After cleaning the filter device, close the seventh pneumatic valve 12 and the fifth pneumatic valve 10, and open the first pneumatic valve 6 and the second pneumatic valve 7. The gypsum slurry enters the gypsum hydrocyclone 20 through the connecting pipe 3 and the filter device. At this time, close the third pneumatic valve 8 and open the sixth pneumatic valve 11. The process water enters the bypass pipe 13 through the second flushing pipe 15. After flushing the bypass pipe 13, it flows into the connecting pipe 3 through the fourth pneumatic valve 9 to prevent residual gypsum slurry from depositing in the bypass pipe 13 and causing blockage in the bypass pipe 13 during the next use. After the bypass pipe 13 is cleaned, close the fourth pneumatic valve 9 and the sixth pneumatic valve 11 in sequence.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A backwashing filter device for preventing clogging of gypsum hydrocyclones, characterized in that, It includes a connecting pipe and a bypass pipe. The inlet of the connecting pipe is connected to the outlet of the gypsum discharge pump, and the outlet of the connecting pipe is connected to the inlet of the gypsum hydrocyclone. The connecting pipe is provided with a first interface, a first pneumatic valve, a filter device, a second interface, a second pneumatic valve and a third interface in sequence along the slurry flow direction. The connecting pipe is sequentially connected to the inlet of the bypass pipe through the first interface. The bypass pipe is sequentially equipped with a third pneumatic valve and a fourth pneumatic valve. A second flushing pipe is connected between the third pneumatic valve and the fourth pneumatic valve. A sixth pneumatic valve is provided on the second flushing pipe. The outlet of the bypass pipe is connected to the connecting pipe through the third interface to form a bypass. The connecting pipe is connected to the first flushing pipe through the second interface. A fifth pneumatic valve is provided on the first flushing pipe. The filter device includes a filter device cylinder, a filter screen is provided on the outlet side of the filter device cylinder, a drain pipe is connected to the side of the filter device cylinder, the drain pipe is located between the inlet side of the filter device cylinder and the filter screen, and a seventh pneumatic valve is provided on the drain pipe. The first pneumatic valve, the second pneumatic valve, the third pneumatic valve, the fourth pneumatic valve, the fifth pneumatic valve, and the sixth pneumatic valve are all connected to the controller.

2. The backwashing filter device according to claim 1, characterized in that, A pressure transmitter and a flow transmitter are provided between the inlet of the connecting pipe and the first interface.

3. The backwashing filter device according to claim 2, characterized in that, The pressure transmitter and the flow transmitter are connected to the controller.

4. The backwashing filter device according to claim 1, characterized in that, The seventh pneumatic valve is connected to the controller.

5. The backwashing filter device according to claim 1, characterized in that, Both ends of the filter device cylinder are connected to the connecting pipe via flanges.

6. The backwashing filter device according to claim 1, characterized in that, The filter screen is a stainless steel perforated filter screen.

7. The backwashing filter device according to claim 1, characterized in that, The outlet end of the sewage pipe is equipped with a receiving trough.

8. The backwashing filter device according to claim 1, characterized in that, The controller is a PLC controller.

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