Nitrogen-protected baking soda pneumatic conveying system

Abstract

The invention provides a nitrogen-protected baking soda pneumatic conveying system, and relates to the field of baking soda pneumatic conveying. The nitrogen-protected baking soda pneumatic conveying system comprises a nitrogen supply unit, a mixing unit and a conveying pipeline, a feeding unit is arranged above the conveying pipeline, and the feeding unit comprises a feeding barrel, a driving motor, a main shaft, a movable grinding disc, a static grinding disc, a vacuumizing pump, a gas discharging pipe, a filter screen, a three-way pipe, a drying box, a sealing cover, a feeding pipe and a discharging pipe. And a driving motor is fixedly connected to the top of the feeding barrel, a main shaft is rotationally connected to the top face of the interior of the feeding barrel, and the output end of the bottom of the driving motor is fixedly connected with the main shaft. By arranging the feeding barrel, the driving motor, the main shaft, the movable grinding disc and the static grinding disc, fed baking soda is ground, so that blocky large-particle baking soda is changed into small-particle baking soda, the deposition risk of the large-particle baking soda in a conveying pipeline is reduced, and the conveying safety is improved.

Description

Technical Field

[0001] The invention relates to the technical field of baking soda pneumatic conveying, in particular to a nitrogen-protected baking soda pneumatic conveying system. Background Art

[0002] Baking soda, also known as sodium bicarbonate, is an inorganic compound, a white powder or fine crystals. It is easily decomposed by heat and slowly decomposes in moist air to produce carbon dioxide. It begins to decompose at about 50°C and completely decomposes when heated to 270°C. Sodium bicarbonate is widely used in industrial fields such as chemical, pharmaceutical, food, light industry, textile, as well as people's daily life, and occupies an important position in the national economy.

[0003] Due to baking soda's properties, pneumatic conveying is generally used during its transportation. Pneumatic conveying, also known as airflow conveying, uses the kinetic energy generated by compressed air or other gases to transport powdered or granular materials along the airflow through a closed pipeline. Its core technology is the application of fluidization technology, which uses airflow to suspend solid particles and move them with the airflow. To enhance conveying safety, nitrogen is added as a protective gas during transportation. This not only reduces moisture absorption and agglomeration of the baking soda during transportation, but also provides explosion protection.

[0004] Although there is hygroscopic protection of nitrogen during the transportation process, baking soda will inevitably come into contact with external air during the feeding process, causing some baking soda to absorb external air and form lumps. After entering the pipeline, it is easy to deposit inside the conveying pipeline, which can easily lead to pipeline blockage or pipeline failure for a long time. The entry of external air will also cause the purity of nitrogen to decrease. Summary of the Invention

[0005] (1) Technical problems solved

[0006] In view of the shortcomings of the existing technology, the present invention provides a nitrogen-protected pneumatic conveying system for baking soda, which solves the problem in the existing technology that the introduction of external air during the feeding process causes the nitrogen purity to decrease and the baking soda absorbs moisture and forms lumps after contacting the air.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a nitrogen-protected baking soda pneumatic conveying system, comprising a nitrogen supply unit, a mixing unit and a conveying pipeline, a feeding unit is arranged above the conveying pipeline, the feeding unit comprises a feeding barrel, a driving motor, a main shaft, a moving grinding disc, a static grinding disc, a vacuum pump, a downpipe, a filter screen, a tee pipe, a drying box, a sealing cover, a feeding pipe and a discharging pipe, the top of the feeding barrel is fixedly connected to the driving motor, the inner top surface of the feeding barrel is rotatably connected to the main shaft, the bottom output end of the driving motor is fixedly connected to the main shaft, and the bottom of the main shaft is fixedly connected to the main shaft. The top of the feed barrel is fixedly connected to a movable grinding disc, the inside of the feed barrel is fixedly connected to a static grinding disc, the top of the feed barrel is fixedly connected to a vacuum pump, the bottom of the vacuum pump is fixedly connected to a downpipe, the inside of the downpipe is fixedly connected to a filter, the top of the vacuum pump is fixedly connected to a tee, the rear of the tee is fixedly connected to a drying box, the inside of the drying box is filled with desiccant, the top of the drying box is fixedly connected to a sealing cover, the top of the feed barrel is fixedly connected to a feed pipe, the bottom of the feed barrel is fixedly connected to a discharge pipe, and the bottom of the discharge pipe is fixedly connected to the conveying pipe.

[0009] Preferably, the nitrogen supply unit is connected to the mixing unit through a pipeline, an injection pipe is fixedly connected between the mixing unit and the delivery pipeline, a nozzle is fixedly connected to the injection pipe, and the nozzle is located inside the delivery pipeline and on the left side of the feeding unit.

[0010] Preferably, an air return pipe and an air inlet pipe are fixedly connected to the nitrogen supply unit, the air return pipe is fixedly connected to the drying box, and the air inlet pipe is fixedly connected to the feed barrel.

[0011] Preferably, a bracket is fixedly connected to the circumferential surface of the feed barrel.

[0012] Preferably, the mixing unit mainly includes an auxiliary material box, a mixing box, a Venturi mixer, a Roots blower and a pulse valve group. The auxiliary material box and the mixing box are both connected to the Venturi mixer, the input end of the Roots blower is fixedly connected to the mixing box, and the output end of the Roots blower is fixedly connected to the injection pipe.

[0013] Preferably, the auxiliary material box is filled with 0.13% of salt-resistant polymer foam stabilizer WP2366.

[0014] Preferably, the main component of the desiccant is activated alumina, and the outside is wrapped with a filter bag net.

[0015] A method for operating a nitrogen-protected baking soda pneumatic conveying system comprises the following specific steps:

[0016] S1. Pour baking soda into the feed barrel through the feed pipe, and then start the vacuum pump to vacuum the inside of the feed barrel;

[0017] S2, start the drive motor to drive the main shaft to rotate, and use the static grinding disc and the dynamic grinding disc to grind the baking soda;

[0018] S3. The nitrogen supply unit injects nitrogen into the feed barrel through the air inlet pipe, and as the vacuum pump works, it enters the drying oven through the three-way pipe, and then returns to the nitrogen supply unit through the return pipe;

[0019] S4. The ground baking soda enters the conveying pipeline from the discharge pipe. At the same time, the nitrogen supply unit and the mixing unit work, and nitrogen and 0.13% salt-resistant polymer foam stabilizer WP2366 are injected into the conveying pipeline through the injection pipe and the nozzle using the non-steady-state nitrogen foam pulse injection technology;

[0020] S5, nitrogen and 0.13% of salt-resistant polymer foam stabilizer WP2366 are mixed with baking soda particles in a conveying pipeline and conveyed downstream.

[0021] (3) Beneficial effects

[0022] The present invention provides a nitrogen-protected pneumatic conveying system for baking soda, which has the following beneficial effects:

[0023] 1. By setting up a feed barrel, a drive motor, a main shaft, a dynamic grinding disc and a static grinding disc, the baking soda fed is ground, thereby turning large particles of baking soda into small particles, reducing the risk of large particles depositing in the conveying pipeline and improving conveying safety.

[0024] 2. By setting up a vacuum pump, downpipe, filter, tee pipe, drying oven and sealing cover, the inside of the feed barrel can be vacuumed after adding baking soda, thereby reducing the mixing of air and maintaining the purity of nitrogen.

[0025] 3. By setting up a nitrogen supply unit, a mixing unit, a conveying pipeline, a feeding unit, an injection pipe and a nozzle, an auxiliary box is provided in the mixing unit, which is filled with a foam stabilizer, and can perform non-steady-state nitrogen foam pulse injection together with nitrogen, thereby improving the conveying energy efficiency, stability and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a front view of a nitrogen-protected baking soda pneumatic conveying system proposed by the present invention;

[0027] Figure 2 This is a schematic cross-sectional structure diagram of a feeding unit of a nitrogen-protected baking soda pneumatic conveying system proposed in the present invention;

[0028] Figure 3 This is a rear view of a nitrogen-protected baking soda pneumatic conveying system proposed by the present invention;

[0029] Figure 4 This is a schematic diagram of the injection pipe structure of a nitrogen-protected baking soda pneumatic conveying system proposed in the present invention.

[0030] Among them, 1. nitrogen supply unit; 2. mixing unit; 3. conveying pipeline; 4. feeding unit; 5. injection pipe; 6. nozzle; 7. return air pipe; 8. intake pipe; 9. bracket; 401. feed barrel; 402. drive motor; 403. main shaft; 404. dynamic grinding disc; 405. static grinding disc; 406. vacuum pump; 407. downpipe; 408. filter; 409. tee pipe; 410. drying box; 411. sealing cover; 412. feed pipe; 413. discharge pipe. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 limiting the present invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0033] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed or detachable connections, or integral connections; mechanical or electrical connections; direct connections, indirect connections through an intermediary, or internal connections between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0034] like Figure 1-4As shown, the embodiment of the present invention provides a nitrogen-protected baking soda pneumatic conveying system, comprising a nitrogen supply unit 1, a mixing unit 2 and a conveying pipeline 3, wherein a monitoring device is provided on the conveying pipeline 3 for monitoring various data in the conveying pipeline 3, and a feeding unit 4 is provided above the conveying pipeline 3, wherein the feeding unit 4 comprises a feeding barrel 401, a driving motor 402, a main shaft 403, a moving grinding disc 404, a static grinding disc 405, a vacuum pump 406, a downpipe 407, a filter screen 408, a tee pipe 409, a drying box 410, a sealing cover 411, a feeding pipe 412 and a discharge The top of the feed barrel 401 is fixedly connected to a drive motor 402, the top surface of the inner surface of the feed barrel 401 is rotatably connected to a main shaft 403, the bottom output end of the drive motor 402 is fixedly connected to the main shaft 403, the bottom of the main shaft 403 is fixedly connected to a dynamic grinding disc 404, the inside of the feed barrel 401 is fixedly connected to a static grinding disc 405, the top of the feed barrel 401 is fixedly connected to a vacuum pump 406, the bottom of the vacuum pump 406 is fixedly connected to a lower air pipe 407, the inside of the lower air pipe 407 is fixedly connected to a filter screen 408, the top of the vacuum pump 406 is fixedly connected to the bottom of the vacuum pump 406, and the bottom of the vacuum pump 406 is fixedly connected to the lower air pipe 407. A three-way pipe 409 is fixedly connected, and the front of the three-way pipe 409 can discharge the extracted air. The rear of the three-way pipe 409 is fixedly connected to a drying box 410. The interior of the drying box 410 is filled with a desiccant. The main component of the desiccant is activated alumina, and the outside is wrapped with a filter bag net. The top of the drying box 410 is fixedly connected to a sealing cover 411. The sealing cover 411 and the drying box 410 are fixed by bolts. When the internal desiccant needs to be replaced, the sealing cover 411 can be opened. The top of the feed barrel 401 is fixedly connected to a feed pipe 412. The feed barrel 401 The bottom of the discharging pipe 413 is fixedly connected, and the bottom of the discharging pipe 413 is fixedly connected to the conveying pipe 3. When baking soda is put into the feeding barrel 401 from the feeding pipe 412, the vacuum pump 406 is started to discharge the air inside the feeding barrel 401 from one side of the tee pipe 409 to form a vacuum environment inside. Then the driving motor 402 is started to rotate the main shaft 403, and the dynamic grinding disc 404 rotates above the static grinding disc 405 and grinds the large particles of baking soda that enter between the two to reduce their particle size. The ground baking soda enters the conveying pipe 3 from the discharging pipe 413.

[0035] The nitrogen supply unit 1 is connected to the mixing unit 2 by a pipeline. The nitrogen supply unit 1 can provide nitrogen with a concentration of 99.95% and a dew point temperature less than -40°. An injection pipe 5 is fixedly connected between the mixing unit 2 and the conveying pipe 3. A nozzle 6 is fixedly connected to the injection pipe 5. There are multiple nozzles 6 and they are evenly distributed on the injection pipe 5. The nozzle 6 is located inside the conveying pipe 3 and on the left side of the feeding unit 4. The nitrogen supply unit 1 is fixedly connected with a return air pipe 7 and an air intake pipe 8. The return air pipe 7 is fixedly connected to the drying box 410, and the air intake pipe 8 is fixedly connected to the feeding barrel 401. After the vacuum is completed inside the feeding barrel 401, the nitrogen supply unit injects nitrogen into the feeding barrel 401 through the air intake pipe 8. As the grinding proceeds, the vacuum pump 406 extracts the internal nitrogen, and then enters the drying box 410 through the other side of the tee pipe 409. After drying, it enters the nitrogen supply unit 1 again from the return air pipe 7.

[0036] A bracket 9 is fixedly connected to the circumferential surface of the feed barrel 401 , and the bracket 9 is used to support and stabilize the feed barrel 401 .

[0037] The mixing unit 2 mainly includes an auxiliary material box, a mixing box, a Venturi mixer, a Roots blower and a pulse valve group. The auxiliary material box and the mixing box are both connected to the Venturi mixer. The input end of the Roots blower is fixedly connected to the mixing box, and the output end of the Roots blower is fixedly connected to the injection pipe 5. The auxiliary material box is filled with 0.13% salt-resistant polymer foam stabilizer WP2366. When the mixing unit 2 is working, the 0.13% salt-resistant polymer foam stabilizer WP2366 and nitrogen are uniformly mixed in the mixing box through the Venturi mixer and enter the injection pipe 5 under the action of the Roots blower. In conjunction with the pulse valve group in the mixing unit 2, they are sprayed into the delivery pipe 3 from the nozzle 6. The injected nitrogen and foam stabilizer WP2366 are mixed with baking soda. WP2366, as a salt-resistant polymer foam stabilizer, usually contains 5% to 8% free water in its formula, but at 0. At an addition ratio of 13%, the actual amount of moisture introduced into the system is only 0.0065% to 0.0104%. When the conveying temperature in the conveying system is maintained at 25°C and the nitrogen dew point is ≤-40°C, the theoretical moisture activity value can be controlled below 0.05%, which is far lower than the critical value of baking soda agglomeration (moisture activity value > 0.65%). At this time, the moisture in WP2366 will be preferentially discharged by nitrogen carrier rather than enriched on the surface of the material, thereby improving the transportation energy efficiency, stability and safety of baking soda during transportation, and reducing the risk of material deposition and pipeline blockage. When using nitrogen and foam stabilizer WP2366 to transport baking soda particles, the pulse valve group in the mixing unit 2 can perform non-steady-state nitrogen foam pulse injection. By alternating large-volume gas injection and static diffusion, periodic pressure fluctuations can be generated, thereby improving transportation energy efficiency and stability.

[0038] A method for operating a nitrogen-protected baking soda pneumatic conveying system comprises the following specific steps:

[0039] S1. Baking soda is added into the feed barrel 401 through the feed pipe 412, and then the vacuum pump 406 is started to evacuate the inside of the feed barrel 401, thereby reducing the mixing of external air and nitrogen in the conveying system and maintaining the purity of the nitrogen;

[0040] S2. Start the drive motor 402 to drive the main shaft 403 to rotate, and use the static grinding disc 405 and the dynamic grinding disc 404 to grind the baking soda, grinding the large particles of baking soda that have agglomerated, thereby reducing the deposition of large particles in the conveying pipeline;

[0041] S3, the nitrogen supply unit 1 injects nitrogen into the feed barrel 401 through the air inlet pipe 8, and as the vacuum pump 406 works, the nitrogen enters the drying box 410 through the three-way pipe 409, and then returns to the nitrogen supply unit 1 through the return pipe 7. While recycling the nitrogen, the dryness of the nitrogen can be maintained;

[0042] S4, the ground baking soda enters the delivery pipe 3 from the discharge pipe 413, and the nitrogen supply unit 1 and the mixing unit 2 are simultaneously operated to inject nitrogen and 0.13% salt-resistant polymer foam stabilizer WP2366 into the delivery pipe 3 through the injection pipe 5 and the nozzle 6 using the non-steady-state nitrogen foam pulse injection technology;

[0043] S5, nitrogen and 0.13% of salt-resistant polymer foam stabilizer WP2366 are mixed with baking soda particles in the conveying pipe 3 and conveyed downstream.

[0044] Each electrical component in the present invention is connected to an external control system, and orderly control of each electrical component is achieved through the external control system. Contents not described in detail in this specification belong to the existing technology known to professional and technical personnel in this field.

[0045] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A nitrogen-protected baking soda pneumatic conveying system, comprising a nitrogen supply unit (1), a mixing unit (2) and a conveying pipeline (3), characterized in that: A feeding unit (4) is provided above the conveying pipeline (3), and the feeding unit (4) comprises a feeding barrel (401), a driving motor (402), a main shaft (403), a moving grinding disc (404), a static grinding disc (405), a vacuum pump (406), a lower air pipe (407), a filter (408), a three-way pipe (409), a drying box (410), a sealing cover (411), a feeding pipe (412) and a discharging pipe (413), wherein the top of the feeding barrel (401) is fixedly connected to the driving motor (402), the inner top surface of the feeding barrel (401) is rotatably connected to the main shaft (403), the bottom output end of the driving motor (402) is fixedly connected to the main shaft (403), the bottom of the main shaft (403) is fixedly connected to the moving grinding disc (404), the inner fixed portion of the feeding barrel (401) is fixedly connected to the main shaft (403), and the inner fixed portion of the feeding barrel (401) is fixedly connected to the main shaft (403). A static grinding disc (405) is fixedly connected to the top of the feed barrel (401), a vacuum pump (406) is fixedly connected to the bottom of the vacuum pump (406), a filter (408) is fixedly connected to the inside of the lower air pipe (407), a three-way pipe (409) is fixedly connected to the top of the vacuum pump (406), a drying box (410) is fixedly connected to the rear of the three-way pipe (409), the interior of the drying box (410) is filled with desiccant, a sealing cover (411) is fixedly connected to the top of the drying box (410), a feed pipe (412) is fixedly connected to the top of the feed barrel (401), a discharge pipe (413) is fixedly connected to the bottom of the feed barrel (401), and the bottom of the discharge pipe (413) is fixedly connected to the conveying pipe (3).

2. The nitrogen-protected baking soda pneumatic conveying system according to claim 1, characterized in that: The nitrogen supply unit (1) and the mixing unit (2) are connected via a pipeline. An injection pipe (5) is fixedly connected between the mixing unit (2) and the delivery pipeline (3). A nozzle (6) is fixedly connected to the injection pipe (5). The nozzle (6) is located inside the delivery pipeline (3) and on the left side of the feeding unit (4).

3. The nitrogen-protected baking soda pneumatic conveying system according to claim 1, characterized in that: A return air pipe (7) and an air inlet pipe (8) are fixedly connected to the nitrogen supply unit (1); the return air pipe (7) is fixedly connected to the drying box (410); and the air inlet pipe (8) is fixedly connected to the feed barrel (401).

4. The nitrogen-protected baking soda pneumatic conveying system according to claim 1, characterized in that: A bracket (9) is fixedly connected to the circumferential surface of the feed barrel (401).

5. The nitrogen-protected baking soda pneumatic conveying system according to claim 2, characterized in that: The mixing unit (2) mainly comprises an auxiliary material box, a mixing box, a Venturi mixer, a Roots blower and a pulse valve group. The auxiliary material box and the mixing box are both connected to the Venturi mixer. The input end of the Roots blower is fixedly connected to the mixing box, and the output end of the Roots blower is fixedly connected to the injection pipe (5).

6. The nitrogen-protected baking soda pneumatic conveying system according to claim 5, characterized in that: The auxiliary material box is filled with 0.13% of salt-resistant polymer foam stabilizer WP2366.

7. The nitrogen-protected baking soda pneumatic conveying system according to claim 1, characterized in that: The main component of the desiccant is activated alumina, and the outside is wrapped with a filter bag net.

8. A method for operating a nitrogen-protected baking soda pneumatic conveying system, based on the nitrogen-protected baking soda pneumatic conveying system according to any one of claims 1 to 7, characterized in that: The specific steps include: S1. Add baking soda into the feed barrel (401) through the feed pipe (412), and then start the vacuum pump (406) to vacuum the inside of the feed barrel (401); S2, starting the driving motor (402) to drive the main shaft (403) to rotate, and using the static grinding disc (405) and the dynamic grinding disc (404) to grind the baking soda; S3, the nitrogen supply unit (1) injects nitrogen into the feed barrel (401) through the air inlet pipe (8), and as the vacuum pump (406) works, the nitrogen enters the drying box (410) through the three-way pipe (409), and then returns to the nitrogen supply unit (1) through the return pipe (7); S4, the ground baking soda enters the conveying pipe (3) from the discharge pipe (413), and the nitrogen supply unit (1) and the mixing unit (2) work at the same time, and nitrogen and 0.13% salt-resistant polymer foam stabilizer WP2366 are injected into the conveying pipe (3) through the injection pipe (5) and the nozzle (6) using the non-steady-state nitrogen foam pulse injection technology; S5, nitrogen and 0.13% of salt-resistant polymer foam stabilizer WP2366 are mixed with baking soda particles in a conveying pipe (3) and conveyed downstream.

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