Online cleaning device based on semi-water rotary table filter

Abstract

The invention discloses an on-line cleaning device based on a semi-water rotary table filter, and belongs to the technical field of wet-process phosphoric acid semi-water process, the on-line cleaning device comprises a semi-water rotary table filter, the semi-water rotary table filter comprises a lower staggered gas disc and an on-line cleaning nozzle group, the lower staggered gas disc comprises a water washing area, an acid filtering area and a primary filtering area, and the primary filtering area is internally provided with a partition plate to form a cleaning area; the bottom of the cleaning area is communicated with a clarifying tank through a pipeline, the inner bottom of the clarifying tank is connected with the inlet end of a high-pressure cleaning pump, the outlet end of the high-pressure cleaning pump is connected with an online cleaning nozzle set, the bottom of the clarifying tank is connected with the inlet end of a slurry pump, and the outlet end of the slurry pump is connected with a semi-water conversion head tank. The device has the beneficial effects that in the phosphoric acid semi-water process production process, online cleaning of the filter cloth and the filter disc is realized, the replacement period of the semi-water filter cloth is prolonged, the cleaning time of the filter disc is shortened, the effective production time of a semi-water filter is prolonged, the productivity of a semi-water filter device is improved, and the device is suitable for the field of phosphoric acid semi-water process production.

Description

Technical Field

[0001] The invention belongs to the technical field of wet phosphoric acid semi-aqueous method, and in particular relates to an online cleaning device based on a semi-aqueous turntable filter. Background Art

[0002] As we all know, in the process of wet phosphoric acid production, system scaling and blockage have always restricted the continuous and stable operation of the device. After analysis, the scaling is mainly composed of sodium fluorosilicate and potassium fluorosilicate, and there are also some phosphogypsum and phosphates of iron, aluminum and magnesium. In the phosphoric acid slurry filtration stage, when phosphoric acid flows into the filter disc and gas-liquid separator, the vacuum causes the water to be rapidly gasified, and the temperature drops sharply by 25-30°C. With the decrease in temperature, the supersaturated impurity compounds in the phosphoric acid will precipitate and adhere to the filter cloth and filter disc to form scaling. Especially in the production process of semi-aqueous phosphoric acid, the concentration of phosphoric acid solution can reach 38%-42%, and the content of impurity compounds in the phosphoric acid solution is relatively high. The situation of precipitation and attachment to the filter cloth and filter disc is more prominent, resulting in serious scaling of the filter cloth and filter disc of the semi-aqueous turntable filter, which requires frequent parking to replace the filter cloth and clean the filter disc, seriously affecting the performance of the filtration capacity. At present, there is no good way to solve this problem. Summary of the invention

[0003] The technical problem to be solved by the present invention is to solve the problem that the filter cloth and filter disc of the rotary filter are seriously scaled during the production of phosphoric acid hemihydrate, thereby affecting the filtering capacity.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] An online cleaning device based on a semi-aqueous turntable filter comprises a semi-aqueous turntable filter, wherein the semi-aqueous turntable filter comprises a lower aeration plate and an online cleaning nozzle group, wherein the lower aeration plate comprises a water washing area, an acid filtering area and a primary filtration area, wherein a cleaning area is formed in the primary filtration area by installing a partition, wherein the bottom of the cleaning area is connected to a clarification tank through a pipeline, wherein the inner bottom of the clarification tank is connected to the inlet end of a high-pressure cleaning pump, wherein the outlet end of the high-pressure cleaning pump is connected to the online cleaning nozzle group, wherein the bottom of the clarification tank is connected to the inlet end of a slurry pump, and wherein the outlet end of the slurry pump is connected to a semi-aqueous conversion high-level tank.

[0006] The top of the clarification tank is provided with a plurality of feeding ports.

[0007] A thermometer and a liquid level gauge are arranged on the top of the clarification tank, and a steam heating pipe is arranged inside the clarification tank.

[0008] The clarification tank is provided with a stirrer.

[0009] The partition is a polymer wear-resistant plastic plate.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] In the semi-aqueous phosphoric acid production process, the online filter cloth and filter disc can be cleaned, the replacement cycle of the semi-aqueous filter cloth can be extended, the cleaning time of the filter disc can be reduced, the effective production time of the semi-aqueous filter can be extended, and the production capacity of the semi-aqueous filter device can be improved. The method is suitable for the semi-aqueous phosphoric acid production field. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0013] Serial numbers and names of the accompanying drawings: semi-water turntable filter 1, lower staggered air plate 2, water washing area 201, acid filtration area 202 and primary filtration area 203, cleaning area 204, partition 3, lower liquid outlet of the cleaning area 4, online cleaning nozzle group 5, clarification tank 6, agitator 7, high-pressure cleaning pump 9, slurry pump 10, feeding port 11. DETAILED DESCRIPTION

[0014] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0015] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0016] Example 1

[0017] like Figure 1 As shown, an online cleaning device based on a semi-water turntable filter described in the present invention includes a semi-water turntable filter 1, the semi-water turntable filter 1 includes a lower staggered gas plate 2 and an online cleaning nozzle group 5, the lower staggered gas plate 2 includes a water washing area 201, an acid filtering area 202 and a primary filtration area 203, a cleaning area 204 is formed in the primary filtration area 203 by installing a partition 3, the bottom of the cleaning area 204 is connected to a clarification tank 6 through a pipeline, the inner bottom of the clarification tank 6 is connected to the inlet end of a high-pressure cleaning pump 9, the outlet end of the high-pressure cleaning pump 9 is connected to the online cleaning nozzle group 5, the bottom of the clarification tank 6 is connected to the inlet end of a slurry pump 10, and the outlet end of the slurry pump 10 is connected to a semi-water conversion high-level tank; a plurality of feeding ports 11 are arranged on the top of the clarification tank 6; a thermometer and a liquid level gauge are arranged on the top of the clarification tank 6, and a steam heating pipe is arranged inside the clarification tank 6; an agitator 7 is arranged on the clarification tank 6; the partition 3 is a polymer wear-resistant plastic plate.

[0018] A cleaning area is set in the lower degassing plate of the filter turntable, and the supporting connection facilities include a clarification tank, a high-pressure cleaning pump 9, a group of several straight nozzle flushing components, and several connecting pipes. The clarification tank is equipped with a rotary rake, and a slurry discharge port and a slurry pump 10 are arranged at the bottom. The device can realize the online cyclic and efficient cleaning of the filter cloth and filter disc of the turntable filter. A partition 3 is installed in the filter cloth washing area of ​​the lower degassing plate of the turntable filter near the primary filtration area, and the formed separation area is used as the cleaning area 204. The upper part of the partition 3 is at the same height as the sealing surface of the lower degassing plate 2. During the operation of the turntable, the partition 3 forms a dynamic seal with the sealing surface of the upper degassing plate 2; the outer side of the cleaning area 204 is connected to the vacuum ring pipe of the nearest filter, so that the cleaning area maintains a slightly negative pressure state, ensuring that the filter cloth of the filter corresponding to the cleaning area 204 is close to the filter disc during the production process, and ensuring the cleaning effect of the filter cloth and the filter disc. The outlet pipe of the high-pressure cleaning pump 9 is connected to the nozzle flushing device of the corresponding cleaning area on the filter. The online cleaning nozzle group 5 can be connected to the water outlets of the branch pipes by multiple groups of vertically arranged nozzles, and the height of the bottom of the nozzle is maintained at 90-100mm from the filter cloth. The cleaning water uses circulating water or condensate as supplementary water to ensure that the cleaning water temperature is 70-80℃. Sulfuric acid solution, fluorosilicic acid solution and various cleaning agents can be added to the feeding port to improve the cleaning effect of the filter cloth and filter disc.

[0019] The cleaning device can effectively enhance the cleaning effect of the filter cloth and filter disc of the semi-aqueous turret filter. The cleaning device installs a partition 2 in the primary filtration area adjacent to the gas plate 1 under the filter turret to form an independent cleaning area 3, which corresponds to the filter online cleaning nozzle group 5. During the operation of the semi-aqueous turret filter 1, the cleaning liquid from the cleaning nozzle group 5 rinses the filter cloth and enters the cleaning area 3, and enters the lower clarification tank 6 through the lower liquid port 4 of the cleaning area. The clarification tank 6 is equipped with an agitator 7. Under the rotation of the agitator 7, the salt scaling materials such as gypsum from the filter disc and filter cloth of the semi-aqueous filter are collected in the central cylinder at the bottom of the clarification tank, and sent to the semi-aqueous conversion tank through the slurry pump 10; the cleaning liquid is pressurized by the high-pressure cleaning pump 9 from the middle of the clarification tank 6 and sent to the online cleaning nozzle group 5 to clean the filter cloth and filter disc of the semi-aqueous filter. During the operation of the online cleaning device, the outlet pressure of the high-pressure cleaning pump 9 is controlled at 1.2-2.0MPa, the cleaning liquid temperature is controlled at 70-80℃, and the cleaning liquid SO 3 The content is controlled at 5%-7%.

[0020] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention.

Claims

1. An online cleaning device based on a semi-water rotary filter, comprising a semi-water rotary filter (1), wherein the semi-water rotary filter (1) comprises a lower aeration plate (2) and an online cleaning nozzle group (5), wherein the lower aeration plate (2) comprises a water washing area (201), an acid filtering area (202) and a primary filtering area (203), and wherein: A cleaning zone (204) is formed in the primary filtration zone (203) by installing a partition (3), and the bottom of the cleaning zone (204) is connected to a clarification tank (6) through a pipeline, the inner bottom of the clarification tank (6) is connected to the inlet end of a high-pressure cleaning pump (9), and the outlet end of the high-pressure cleaning pump (9) is connected to an online cleaning nozzle group (5), the bottom of the clarification tank (6) is connected to the inlet end of a slurry pump (10), and the outlet end of the slurry pump (10) is connected to a semi-water conversion high-level tank.

2. The online cleaning device based on a semi-water turret filter according to claim 1 is characterized in that: The top of the clarification tank (6) is provided with a plurality of feeding ports (11).

3. The online cleaning device based on a semi-water turret filter according to claim 2 is characterized in that: A thermometer and a liquid level gauge are arranged on the top of the clarification tank (6), and a steam heating pipe is arranged inside the clarification tank (6).

4. The online cleaning device based on a semi-water turret filter according to claim 3 is characterized in that: The clarification tank (6) is provided with a stirrer (7).

5. The online cleaning device based on a semi-water turret filter according to claim 4 is characterized in that: The partition plate (3) is a polymer wear-resistant plastic plate.

Images