Phosphorus pentoxide pressurized screening device

Abstract

The utility model discloses a pressurized screening device for phosphorus pentoxide, and belongs to the technical field of phosphorus chemical industry. Comprising a spiral conveying structure, a rotary vibration sieve, a powder storage bin and a particle storage bin, the spiral conveying structure is connected with a feeding port of the rotary vibration sieve, and a fine material outlet and a coarse material outlet of the rotary vibration sieve are connected with the powder storage bin and the particle storage bin respectively; the rotary vibration sieve is of a closed structure, air seal machines are arranged on discharging ports in the bottoms of the powder storage bin and the granule storage bin, the spiral conveying structure is connected with a phosphorus burning gun air supply device through a pipeline, and the phosphorus burning gun air supply device comprises an air compression structure, an air storage tank and a freeze-drying type drying structure which are sequentially connected. And an air outlet of the freeze-drying type drying structure is connected with an air inlet of the phosphorus burning gun and the spiral conveying structure through pipelines. According to the device, pressurization facilitates screening of the rotary vibration screen, and discharging of the powder storage bin and the particle storage bin is facilitated; compressed air of the phosphorus gun air supply device is low in temperature and moisture content, and cold compressed air also cools phosphorus pentoxide.

Description

Technical Field

[0001] The utility model belongs to the technical field of phosphorus chemical industry, and particularly relates to a pressurized screening device for phosphorus pentoxide. Background Art

[0002] At present, the preparation of phosphorus pentoxide in industry generally adopts the oxidation combustion method: yellow phosphorus is used as the raw material, and the yellow phosphorus is heated and melted and then added to the combustion furnace. The dried air is introduced into the combustion furnace to react and burn with the yellow phosphorus to generate phosphorus pentoxide flue gas, and then the phosphorus pentoxide flue gas is cooled and settled to make the finished phosphorus pentoxide product. Usually, the phosphorus pentoxide flue gas is obtained through a phosphorus burning tower, and the phosphorus pentoxide flue gas is cooled through multiple cooling towers (in series), and the phosphorus pentoxide flue gas is cooled through multiple settling towers (in series).

[0003] For example, the patent with application number CN202120468720.6 discloses a compact phosphorus pentoxide production system, including a cooling water supply device, an exhaust gas treatment device, and a phosphorus burning tower, a cooling device, a sedimentation device and a storage bin connected in sequence, wherein the cooling device includes a plurality of cooling towers connected in series in sequence, the sedimentation device includes a plurality of sedimentation towers connected in series in sequence and a conveying structure for delivering the phosphorus pentoxide output from the sedimentation tower to the storage bin, the cooling tower is provided with a cooling jacket, and the cooling jacket is connected to the cooling water supply device through a pipeline; the system also includes a four-layer platform, the phosphorus burning tower, the cooling device and the sedimentation device are respectively arranged at the front, middle and rear of the four-layer platform, The phosphorus burning towers are arranged side by side on the left and right, the phosphorus burning tower is located in front of the first cooling tower, and the multiple sedimentation towers are distributed in multiple rows side by side on the left and right, each row is composed of at least two sedimentation towers arranged side by side front and back, and the storage bin is located at the rear and lower side of the sedimentation device; the phosphorus burning tower and the cooling tower are arranged on the bottom to the third floor of the four-story platform, the sedimentation tower is arranged on the first and second floors of the four-story platform, the storage bin is arranged on the bottom floor of the four-story platform, the cooling water supply device is arranged on the third floor of the four-story platform, the conveying structure is arranged on the first floor of the four-story platform and its output end is to the bottom floor of the four-story platform, and the exhaust gas treatment device is connected to the last sedimentation tower through a pipeline and is arranged on the fourth floor of the four-story platform.

[0004] The main function of the cooling tower is to cool down, but there is still a small amount of phosphorus pentoxide adhering to the inner wall of the cooling tower. Under the action of the vibration structure (intermittent action) of the outer wall of the cooling tower and the gravity of the phosphorus pentoxide itself, the phosphorus pentoxide adhering to the inner wall and the slab on the inner wall will fall and deposit at the bottom of the cooling tower, and needs to be discharged regularly. However, customers usually need powdered phosphorus pentoxide (higher activity), and the phosphorus pentoxide at the bottom of the cooling tower usually does not meet the requirements. Therefore, it is necessary to use a rotary vibrating screen to screen the phosphorus pentoxide output from the cooling tower to obtain powdered phosphorus pentoxide. In the prior art, a screening device is set at the discharge port of the cooling device, and the screening device includes a spiral conveying structure, a rotary vibrating screen, a powder storage bin and a granular storage bin, etc. The spiral conveying structure is connected to the feed port of the rotary vibrating screen, and the fine material outlet and the coarse material outlet of the rotary vibrating screen are respectively connected to the powder storage bin and the granular storage bin. The mesh aperture of the rotary vibrating screen is about 2.5 mm and the temperature of the phosphorus pentoxide output by the cooling device is high, which may cause the phosphorus pentoxide to condense on the mesh of the rotary vibrating screen, thereby blocking or partially blocking the mesh, resulting in a slow screening speed. Summary of the invention

[0005] In order to solve the above problems, the embodiment of the utility model provides a pressurized screening device for phosphorus pentoxide, which facilitates the screening by the rotary vibrating screen and the discharge of the powder storage bin and the granular storage bin; the compressed air of the phosphorus gun air supply device has the characteristics of low temperature and low moisture content, and the cold compressed air also cools the phosphorus pentoxide. The technical solution is as follows:

[0006] The utility model embodiment provides a pressurized screening device for phosphorus pentoxide, which includes a spiral conveying structure, a rotary vibrating screen 4, a powder storage bin 5 and a granular material storage bin 6, wherein the spiral conveying structure is connected to the feed port of the rotary vibrating screen 4, and the fine material outlet and the coarse material outlet of the rotary vibrating screen 4 are respectively connected to the powder storage bin 5 and the granular material storage bin 6; the rotary vibrating screen 4 is a closed structure, and the discharge ports at the bottom of the powder storage bin 5 and the granular material storage bin 6 are both provided with air-reducing devices, the spiral conveying structure is connected to a phosphorus burning gun air supply device through a pipeline, and the phosphorus burning gun air supply device includes an air compression structure, a gas storage tank and a freeze-drying drying structure connected in sequence, and the air outlet of the freeze-drying drying structure is connected to the air inlet of the phosphorus burning gun and the spiral conveying structure through a pipeline.

[0007] Preferably, the air outlet of the freeze-drying drying structure in the embodiment of the utility model is connected to the feed end of the spiral conveying structure through a pipeline.

[0008] Among them, the spiral conveying structure in the embodiment of the utility model includes a horizontal screw conveyor 1 and a lifting screw conveyor 2, and the rotary vibrating screen 4 is located above the powder storage bin 5 and the granular material storage bin 6; the lifting screw conveyor 2 is located next to the rotary vibrating screen 4, and is inclined, and its upper end is connected to the feed port of the rotary vibrating screen 4 through a hose 3, and its lower end is connected to the discharge end of the horizontal screw conveyor 1; the air outlet of the freeze-drying drying structure is connected to the feed end of the horizontal screw conveyor 1 through a pipeline.

[0009] Specifically, the hose 3 in the embodiment of the utility model is a steel wire hose.

[0010] Preferably, the outer walls of the horizontal screw conveyor 1, the lifting screw conveyor 2, the powder storage bin 5 and the granular material storage bin 6 in the embodiment of the utility model are all provided with water cooling jackets.

[0011] Furthermore, a pressure gauge is provided on the top of the powder storage bin 5 and / or the granular storage bin 6 in the embodiment of the utility model.

[0012] Furthermore, the phosphorus gun air supply device in the embodiment of the utility model also includes a first control valve, a second control valve, a front oil remover, a rear oil remover and a valve group, and the air compression structure is connected to the gas tank through a pipeline; the gas tank is divided into two outputs, one is connected to an inlet of the valve group through a pipeline with a second control valve, and the other is connected to the freeze-drying drying structure through a pipeline with a first control valve and a front oil remover; the freeze-drying drying structure is connected to another inlet of the valve group through a pipeline with a rear oil remover; the two outlets of the valve group are respectively connected to the air inlet and the spiral conveying structure of the phosphorus burning gun through pipelines.

[0013] The beneficial effects brought by the technical solution provided by the embodiment of the utility model are:

[0014] (1) Pressurization facilitates the vibrating screen and increases the screening speed.

[0015] (2) Pressurization facilitates the discharge of the powder storage bin and the granular storage bin, avoids clogging of the discharge ports of the powder storage bin and the granular storage bin, and prevents the powder from adhering to the inner wall of the powder storage bin and the granular storage bin.

[0016] (3) The compressed air of the phosphorus gun air supply device has the characteristics of low temperature and low moisture content. The cold compressed air also cools the phosphorus pentoxide (easy to package. The phosphorus pentoxide output from the powder storage bin and the granular storage bin must be packaged, and the packaging temperature is required to be less than 40°C). BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a principle block diagram of the pressurized screening device of phosphorus pentoxide in the embodiment of the utility model;

[0018] Figure 2 It is the principle block diagram of the phosphorus gun gas supply device;

[0019] Figure 3 It is a partial structural schematic diagram of a pressurized screening device for phosphorus pentoxide;

[0020] Figure 4 It is a top view of a pressurized screening device for phosphorus pentoxide.

[0021] In the figure: 1 horizontal screw conveyor, 2 lifting screw conveyor, 3 hose, 4 rotary vibrating screen, 5 powder storage bin, 6 granular material storage bin. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0023] Example 1

[0024] See also Figure 1-4 Embodiment 1 provides a pressurized screening device for phosphorus pentoxide, which includes a spiral conveying structure, a rotary vibrating screen 4, a powder storage bin 5, and a granular storage bin 6. The spiral conveying structure is used to convey high-temperature phosphorus pentoxide, and its feed port is connected to the discharge port at the bottom of the cooling tower, and its discharge port is connected to the feed port of the rotary vibrating screen 4. The rotary vibrating screen 4 is a closed structure, which is located above the powder storage bin 5 and the granular storage bin 6, and its fine material outlet is connected to the feed port at the top of the powder storage bin 5, and its coarse material outlet is connected to the feed port at the top of the granular storage bin 6. The discharge ports at the bottom of the powder storage bin 5 and the granular storage bin 6 are both provided with air shut-off devices (when packaging, the air shut-off devices are opened) and packaging structures. The spiral conveying structure is connected to the phosphorus burning gun air supply device through a pipeline to realize the pressurized screening of the rotary vibrating screen 4 and the pressurized discharge of the powder storage bin 5 and the granular storage bin 6. The phosphorus gun air supply device includes an air compression structure, a gas storage tank, and a freeze-drying drying structure, which are connected in sequence through pipelines. The structure of the phosphorus gun air supply device can refer to the description of the patent with application number CN202120468716.X. The phosphorus gun air supply device can provide low-temperature dry air (dryness 98% to avoid the reaction of phosphorus pentoxide with water), and can ensure that the pressure in the vibrating screen 4 is about 0.3Mpa. The air outlet of the freeze-drying drying structure is connected to the air inlet and the spiral conveying structure of the phosphorus burning gun through a pipeline. Preferably, the air outlet of the freeze-drying drying structure is connected to the feed end of the spiral conveying structure through a pipeline to enhance the cooling effect.

[0025] Among them, see Figure 2-4The screw conveying structure in the embodiment of the utility model includes a horizontal screw conveyor 1 and a lifting screw conveyor 2. The horizontal screw conveyor 1 is arranged horizontally, and its feed port is connected to the cooling tower (or the intermediate silo outputted from the discharge ports of multiple cooling towers). The lifting screw conveyor 2 is located next to the rotary vibrating screen 4, and is arranged obliquely. The discharge end at its upper end (located directly above the rotary vibrating screen 4) is connected to the feed port of the rotary vibrating screen 4 through a hose 3, and the feed end at its lower end is connected to the discharge end of the horizontal screw conveyor 1. The air outlet of the freeze-drying drying structure is connected to the feed end of the horizontal screw conveyor 1 through a pipeline. Specifically, the hose 3 is a steel wire hose. Preferably, the outer walls of the horizontal screw conveyor 1, the lifting screw conveyor 2, the powder storage bin 5 and the granular storage bin 6 in the embodiment of the utility model are all provided with a water-cooling jacket.

[0026] Furthermore, a pressure gauge is provided on the top of the powder storage bin 5 and / or the granular storage bin 6 in the embodiment of the utility model.

[0027] Example 2

[0028] join Figure 2 , Example 2 provides a pressurized screening device for phosphorus pentoxide, the structure of which is basically the same as that of Example 1, except that: the phosphorus gun air supply device in the embodiment of the utility model also includes an air compression structure, an air storage tank, a freeze-drying structure (specifically, two dryers of model YK60A in parallel), a first control valve, a second control valve, a front deoiler, a rear deoiler and a valve group, etc., which is similar to the patent with application number CN202120468716.X. The air compression structure (specifically, a screw air compressor, with a specific model of BK37-8ZG) is connected to the air storage tank through a pipeline. The air storage tank is divided into two outputs, one of which is connected to an inlet connection of the valve group through a pipeline with a second control valve, and the other is connected to the freeze-drying structure through a pipeline with a first control valve and a front deoiler. When the dryness of the air output by the air compression structure meets the requirements, the first control valve is closed, the second control valve is opened, and the freeze-drying structure is closed to save energy. The valve group is composed of multiple valves, including two inlets and two outlets. The freeze-drying drying structure is connected to the other inlet of the valve group through a pipeline with a rear degreaser. The two outlets of the valve group are respectively connected to the air inlet of the phosphorus burning gun and the spiral conveying structure through pipelines. The valve group can be switched; for example, the phosphorus burning gun uses non-freeze-dried compressed air, and the spiral conveying structure uses freeze-dried compressed air; for example, the phosphorus burning gun and the spiral conveying structure both use freeze-dried compressed air; for example, the phosphorus burning gun and the spiral conveying structure both use non-freeze-dried compressed air; for example, the phosphorus burning gun uses freeze-dried compressed air, and the spiral conveying structure uses non-freeze-dried compressed air.

[0029] The “first” and “second” in this embodiment are only used for distinction and have no other special meanings.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressurized screening device for phosphorus pentoxide, comprising a spiral conveying structure, a rotary vibrating screen (4), a powder storage bin (5) and a granular storage bin (6), wherein the spiral conveying structure is connected to a feed port of the rotary vibrating screen (4), and a fine material outlet and a coarse material outlet of the rotary vibrating screen (4) are connected to the powder storage bin (5) and the granular storage bin (6) respectively; characterized in that: The rotary vibrating screen (4) is a closed structure. The outlets at the bottom of the powder storage bin (5) and the granular storage bin (6) are both provided with air blowers. The spiral conveying structure is connected to the phosphorus burning gun air supply device through a pipeline. The phosphorus burning gun air supply device comprises an air compression structure, an air storage tank and a freeze-drying structure connected in sequence. The air outlet of the freeze-drying structure is connected to the air inlet of the phosphorus burning gun and the spiral conveying structure through a pipeline.

2. The pressurized screening device for phosphorus pentoxide according to claim 1, characterized in that: The air outlet of the freeze-drying structure is connected to the feed end of the spiral conveying structure through a pipeline.

3. The pressurized screening device for phosphorus pentoxide according to claim 2, characterized in that: The screw conveying structure comprises a horizontal screw conveyor (1) and a lifting screw conveyor (2); the rotary vibrating screen (4) is located above the powder storage bin (5) and the granular storage bin (6); the lifting screw conveyor (2) is located beside the rotary vibrating screen (4) and is arranged obliquely, with its upper discharge end connected to the feed port of the rotary vibrating screen (4) through a hose (3), and its lower feed end connected to the discharge end of the horizontal screw conveyor (1); the air outlet of the freeze-drying structure is connected to the feed end of the horizontal screw conveyor (1) through a pipeline.

4. The pressurized screening device for phosphorus pentoxide according to claim 3, characterized in that: The hose (3) is a steel wire hose.

5. The pressurized screening device for phosphorus pentoxide according to claim 3, characterized in that: The outer walls of the horizontal screw conveyor (1), the lifting screw conveyor (2), the powder material storage bin (5) and the granular material storage bin (6) are all provided with water cooling jackets.

6. The pressurized screening device for phosphorus pentoxide according to claim 1, characterized in that: A pressure gauge is provided on the top of the powder material storage bin (5) and / or the granular material storage bin (6).

7. The pressurized screening device for phosphorus pentoxide according to claim 1, characterized in that: The phosphorus gun air supply device also includes a first control valve, a second control valve, a front deoiler, a rear deoiler and a valve group. The air compression structure is connected to the air storage tank through a pipeline; the air storage tank is divided into two outputs, one of which is connected to an inlet of the valve group through a pipeline with a second control valve, and the other is connected to a freeze-drying drying structure through a pipeline with a first control valve and a front deoiler; the freeze-drying drying structure is connected to another inlet of the valve group through a pipeline with a rear deoiler; and the two outlets of the valve group are respectively connected to the air inlet and the spiral conveying structure of the phosphorus burning gun through pipelines.

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