Online cleaning device based on semi-water rotary table filter

Abstract

The utility model discloses an on-line cleaning device based on a semi-water rotary table filter, which belongs to the technical field of wet-process phosphoric acid semi-water process and 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, and the lower staggered gas disc comprises a water washing area, an acid filtering area and a primary filtering 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 group; the bottom of the clarifying tank is connected with the inlet end of a slurry pump; 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 utility model belongs to the technical field of phosphoric acid semi -water method, specifically relates to an on -line cleaning device based on semi -water rotary table filter. BACKGROUND

[0002] It is known that in the production process of phosphoric acid, system scaling, blockage has been restricting the continuous, stable operation of the device, through analysis scaling mainly by sodium fluorosilicate, potassium fluorosilicate is composed, in addition, there are some phosphogypsum and iron, aluminum, magnesium phosphate salt.In the phosphoric acid slurry filtration stage, when phosphoric acid flows into filter disc, gas-liquid separator, due to the vacuum effect makes water vaporization sharply, temperature drops sharply up to 25~30 DEG C, with the reduction of temperature, the impurity compound in phosphoric acid in supersaturation will precipitate and adhere to filter cloth, filter disc and form scaling.Especially in the semi -water phosphoric acid production process, the concentration of phosphoric acid solution can reach 38%-42%, the impurity compound content in phosphoric acid solution is higher, the situation of precipitation adhesion on filter cloth, filter disc is more prominent in the case of cooling, causes semi -water rotary table filter cloth, filter disc scaling is serious, needs to frequently stop and change filter cloth, clean filter disc, seriously affects the play of filtration capacity, at present, there is no good method to solve this problem. CONTENT

[0003] The utility model solves the technical problems in the semi -water production process of phosphoric acid rotary table filter cloth, filter disc scaling is serious, the problem of affecting filtration capacity.

[0004] In order to realize the above -mentioned purpose, the technical scheme adopted by the utility model is:

[0005] An on -line cleaning device based on semi -water rotary table filter, including semi -water rotary table filter, the semi -water rotary table filter includes lower wrong gas disc and on -line cleaning spray head group, the lower wrong gas disc includes washing water area, filter acid area and primary filter area, the primary filter area is formed by installing the baffle in the cleaning area, the bottom of the cleaning area is communicated with the clarifying tank through the pipeline, the inner bottom of the clarifying tank is connected with the inlet end of the high pressure cleaning pump, the outlet end of the high pressure cleaning pump is connected with the on -line cleaning spray head group, the bottom of the clarifying tank is connected with the inlet end of the slurry pump, and the outlet end of the slurry pump is connected with the semi -water conversion high -level tank.

[0006] The top of the clarifying tank is provided with a plurality of charging ports.

[0007] The clarifying tank is provided with a thermometer and a liquid level meter, and the inside of the clarifying tank is provided with a steam heating pipe.

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

[0009] The baffle is a high molecular wear -resistant plastic plate.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] In the production process of phosphoric acid hemihydrate method, realize the cleaning of online filter cloth and filter disc, prolong the replacement cycle of hemihydrate filter cloth, reduce the cleaning time of filter disc, prolong the effective production time of hemihydrate filter machine, improve the production capacity of hemihydrate filter device, and be applicable to the production field of phosphoric acid hemihydrate method. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the structural schematic diagram of the embodiment of the utility model.

[0013] Drawing serial number and name: hemihydrate rotary table filter machine 1, lower staggered air disc 2, washing water area 201, filter acid area 202, primary filter area 203, cleaning area 204, partition 3, cleaning area lower liquid outlet 4, online cleaning spray head group 5, clarifying tank 6, agitator 7, high-pressure cleaning pump 9, slurry pump 10, feeding port 11. DETAILED DESCRIPTION

[0014] The utility model will be described in detail below in combination with the drawings and specific embodiment, and the utility model is explained by the illustrative embodiment and the description of the utility model, but it is not as the limitation of the utility model.

[0015] In the description of the utility model, it is understood that the orientation or position relation indicated by the terms "up", "down", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like is the orientation or position relation based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it can not be understood as the limitation of the utility model. EMBODIMENT

[0016] As Figure 1The utility model discloses a kind of online cleaning devices based on semi-water rotary table filter machine, including semi-water rotary table filter machine 1, the semi-water rotary table filter machine 1 includes lower air baffle 2 and online cleaning spray head group 5, the lower air baffle 2 includes washing water area 201, filter acid area 202 and primary filter area 203, cleaning area 204 is formed in primary filter area 203 by installing baffle 3, the bottom of cleaning area 204 is communicated with clarifying tank 6 by pipeline, the inner bottom of clarifying tank 6 is connected with the inlet end of high-pressure cleaning pump 9, the outlet end of high-pressure cleaning pump 9 is connected with online cleaning spray head group 5, the bottom of clarifying tank 6 is connected with the inlet end of slurry pump 10, and the outlet end of slurry pump 10 is connected with semi-water conversion high tank;The top of clarifying tank 6 is provided with a plurality of charging ports 11;Temperature meter and liquid level meter are arranged on clarifying tank 6, and steam heating pipe is arranged in clarifying tank 6;Stirrer 7 is arranged on clarifying tank 6;The baffle 3 is high-molecular wear-resistant plastic plate.

[0017] A cleaning area is arranged in the lower air baffle of filter machine rotary table, and the matched connecting facilities include clarifying tank, high-pressure cleaning pump 9, a plurality of straight spray head flushing assemblies and a plurality of connecting pipelines. The device can realize the cyclic and efficient cleaning of filter cloth and filter disc of rotary table filter machine. A baffle 3 is arranged in the washing water area adjacent to the primary filter area of the lower air baffle of rotary table filter machine, and a separation area formed by the baffle 3 serves as a cleaning area 204. The upper part of the baffle 3 is flush with the sealing surface of the lower air baffle 2, and the baffle 3 and the sealing surface of the upper air baffle 2 form a dynamic seal during the operation of the rotary table. The outside of the cleaning area 204 is communicated with the vacuum ring tube of the nearest filter machine, so that the cleaning area maintains a micro-negative pressure state, ensuring that the filter cloth of the filter machine corresponding to the cleaning area 204 tightly contacts the filter disc during production, 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 with the spray head flushing device of the corresponding cleaning area of the filter machine. The online cleaning spray head group 5 can be communicated with a plurality of nozzles and a plurality of water outlets of branch pipes by a plurality of vertically arranged branch pipes. The height between the bottom of the nozzle and the filter cloth is maintained at 90-100 mm. The cleaning water uses circulating water or condensate as make-up water, so as to ensure that the temperature of the cleaning water is 70-80 ℃. Sulfuric acid solution, fluorosilicic acid solution and various cleaning agents can be added through the charging port, so as to improve the cleaning effect of the filter cloth and the filter disc.

[0018] The cleaning device can effectively strengthen the filter cloth and filter disc cleaning effect of the semi-water rotary table filter, the cleaning device is installed with a partition plate 3 in the adjacent primary filtration area of the lower air distribution disc 2 of the filter rotary table, to form an independent cleaning area 204, corresponding to the online cleaning nozzle group 5 of the filter, during the operation of the semi-water rotary table filter 1, the cleaning liquid from the online cleaning nozzle group 5 washes the filter cloth and then enters the cleaning area 204, enters the lower clarifying tank 6 through the lower liquid outlet 4 of the cleaning area, the clarifying tank 6 is provided with a stirrer 7, under the rotation of the stirrer 7, the gypsum and other salt scale materials from the filter disc and filter cloth of the semi-water filter are collected to the central cylinder at the bottom of the clarifying tank, and are sent to the semi-water conversion tank through a slurry pump 10; the cleaning liquid is pressurized by a high-pressure cleaning pump 9 from the middle of the clarifying tank 6 and is sent to the online cleaning nozzle group 5 to clean the filter cloth and filter disc of the semi-water 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 temperature of the cleaning liquid is controlled at 70-80℃, and the SO3 content of the cleaning liquid is controlled at 5%-7%.

[0019] The above describes the technical solutions provided by the embodiments of the present application in detail, and the principles and implementation manners of the embodiments of the present application are described by applying specific examples, and the above description of the embodiments is only applicable to helping understand the principles of the embodiments of the present application.

Claims

1. An on-line cleaning device based on a semi-water rotary table filter, comprising a semi-water rotary table filter (1), the semi-water rotary table filter (1) comprising a lower air distribution disc (2) and an on-line cleaning nozzle group (5), the lower air distribution disc (2) comprising a washing water zone (201), a filter acid zone (202) and a primary filtration zone (203), characterized in that: The primary filter area (203) is provided with a cleaning area (204) formed by installing a partition (3), the bottom of the cleaning area (204) is connected to a clarifier (6) through a pipeline, the inner bottom of the clarifier (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 an online cleaning nozzle group (5), the bottom of the clarifier (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 tank.

2. The on-line cleaning device based on the semi-water transfer table filter machine according to claim 1, characterized in that: The top of the clarifier (6) is provided with a plurality of feeding ports (11).

3. The on-line cleaning device based on the semi-water transfer table filter machine according to claim 2, characterized in that: The clarifier (6) is provided with a thermometer and a liquid level meter, and is provided with steam heating pipes in the inside.

4. The on-line cleaning device based on the semi-water transfer table filter machine according to claim 3, characterized in that: The clarifier (6) is provided with a stirrer (7).

5. The on-line cleaning device based on the semi-water transfer table filter machine according to claim 4, characterized in that: The partition (3) is a high-molecular wear-resistant plastic plate.

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