Neutralization reactor carbon dioxide capture device

Abstract

The utility model discloses a kind of carbon dioxide capture devices of neutralization reactor, device includes buffer tank, soda storage tank and multiple groups of reaction tube, reaction tube is coaxially arranged mesh tube and forms annular interlayer;Soda storage tank bottom surface is connected mesh tube, jar inner rotating shaft and spiral feeding blade will soda uniform velocity send into mesh tube;Reaction tube outer wall is equipped with phosphoric acid delivery pipe intercommunication interlayer.Working, soda is diffused to interlayer with phosphoric acid continuous reaction by mesh tube, generated slurry is settled to buffer tank, carbon dioxide gas is collected to storage tank by output pipe.This utility model is adopted structure, and it realizes the continuous production of neutralization reaction, solves the problem of low production efficiency of traditional batch type, soda deposition leads to unstable reaction, simultaneously effectively recycles carbon dioxide resource, reduces environmental protection pressure and raw material cost.

Description

Technical Field

[0001] This utility model relates to the field of chemical production technology, specifically a carbon dioxide capture device for a neutralization reactor. Background Technology

[0002] In the production of phosphate products such as sodium tripolyphosphate, the neutralization reaction between soda ash and phosphoric acid is a critical process, directly affecting the quality of subsequent products, production efficiency, and environmental indicators. Currently, the industry typically uses open-type stirred reactors for neutralization reactions. The specific operation involves adding phosphoric acid and soda ash to the reactor in a specific ratio, using a stirring device to mix and react the materials. During the reaction, the amount of soda ash and phosphoric acid added needs to be manually or semi-automatically adjusted according to the reaction liquid level. After the reaction is complete, the K-value is tested to determine whether the slurry is qualified. Qualified slurry is then transferred to a subsequent storage tank for later use.

[0003] However, the aforementioned traditional processes face many problems that urgently need to be addressed in practical production applications: 1. Poor production continuity and low efficiency: Traditional processes adopt a batch reaction mode. After each batch of reaction is completed, operations such as unloading, cleaning, and refeeding are required. This makes it impossible to achieve continuous neutralization reaction, resulting in interruption of the production process and limited capacity per unit time, which makes it difficult to meet the needs of large-scale industrial production.

[0004] Second, insufficient reaction stability poses safety hazards: Since the materials rely on stirring and mixing in the open reaction vessel, soda ash is prone to settle at the bottom of the reaction vessel due to insufficient stirring or gravity, which can lead to excessively violent local reactions and cause overflow accidents. This not only wastes raw materials but may also threaten the production environment and the safety of operators.

[0005] Third, carbon dioxide gas is difficult to collect effectively: The reaction of soda ash and phosphoric acid produces a large amount of carbon dioxide gas. The open structure of the reactor causes this gas to be directly emitted into the atmosphere. On the one hand, this wastes valuable carbon resources, which cannot be used as raw materials for subsequent products. On the other hand, the untreated gas emissions do not meet the current requirements for green and environmentally friendly production, increasing the environmental pressure on enterprises. Summary of the Invention

[0006] The technical problem to be solved by this utility model is to provide a carbon dioxide capture device for a neutralization reactor, which can effectively solve the technical problems of poor production continuity, insufficient reaction stability and difficulty in effectively collecting carbon dioxide in the traditional neutralization reaction process of soda ash and phosphoric acid.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a neutralization reactor carbon dioxide capture device, including a buffer tank, the top of the buffer tank is provided with multiple reaction tubes, the reaction tubes are provided with mesh tubes, and the mesh tubes are provided with annular interlayers. The upper end of the mesh tube is connected to the bottom surface of the soda ash storage tank; The outer wall of the reaction tube is provided with a phosphoric acid delivery tube that connects to the interlayer.

[0008] In a preferred embodiment, the soda ash storage tank is provided with multiple vertical rotating shafts that extend into a mesh tube, and the rotating shaft portion located inside the mesh tube is provided with spiral feeding blades.

[0009] In a preferred embodiment, a drive motor is provided at the top of the soda ash storage tank, and the drive shaft of the drive motor is inserted downward into the soda ash storage tank, with the upper end of the shaft being axially connected to the drive shaft of the drive motor.

[0010] In a preferred embodiment, the main pipeline of the phosphoric acid delivery pipe is connected to the side wall of one of the reaction pipes, and a flow valve is provided on the main pipeline; The phosphoric acid delivery pipe is also equipped with multiple branch pipes, which are respectively connected to the side wall of the remaining reaction pipe. A three-way flow valve is provided at the connection between the branch pipe and the main pipe.

[0011] In a preferred embodiment, the bottom surface of the soda ash storage tank forms multiple inverted conical regions, and the upper end of the mesh tube is located within the inverted conical regions.

[0012] In a preferred embodiment, the top surface of the buffer tank is provided with a carbon dioxide output pipe, which is connected to a carbon dioxide storage tank, and a vacuum pump is installed on the carbon dioxide storage tank. The buffer tank is provided with a slurry output pipe on the lower side wall, which is connected to the slurry storage tank. A slurry delivery pump is installed on the slurry output pipe.

[0013] In a preferred embodiment, the reaction tube, mesh tube, spiral feed blades, and rotating shaft are made of 316L stainless steel, Hastelloy C-276, or PTFE-lined steel.

[0014] The carbon dioxide capture device for a neutralization reactor provided by this utility model, by adopting the above-described structure, has the following beneficial effects: (1) Through the coordinated design of soda ash storage tank, mesh pipe and reaction pipe, soda ash is continuously conveyed by spiral feeding blades, and phosphoric acid is stably supplied to the jacket by the conveying pipe. The two react and settle naturally in the vertical reaction pipe, so that the neutralization reaction can be carried out continuously, avoiding the interruption of batch production process, greatly improving the unit time capacity. During the reaction, the spiral feeding ensures that the soda ash falls evenly and does not settle, and the ring contact reaction makes the material fully mixed. This solves the problems of local violent reaction and overflow caused by soda ash deposition in the traditional process, reduces raw material waste and ensures safe and stable production. (2) After the carbon dioxide generated by the reaction enters the buffer tank with the material, it is pumped to a special storage tank through the carbon dioxide output pipe and vacuum pump. After being washed with water and other treatments, it can be directly used as raw material for subsequent products for secondary use, avoiding the waste of valuable carbon resources. Compared with the traditional open reaction vessel method of direct carbon dioxide emission, this device realizes the recycling of carbon resources, reduces the raw material cost of enterprises, and reduces atmospheric emission pressure. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] In the diagram: 1. Buffer tank; 2. Soda ash storage tank; 3. Reaction pipe; 4. Mesh pipe; 5. Spiral feeder blade; 6. Jacket; 7. Phosphoric acid conveying pipe; 8. Three-way flow valve; 9. Flow valve; 10. Rotary shaft; 11. Drive motor; 12. Carbon dioxide output pipe; 13. Slurry output pipe; 14. Carbon dioxide storage tank; 15. Slurry storage tank. Detailed Implementation

[0017] Example 1: like Figure 1 In a neutralization reactor carbon dioxide capture device, there is a buffer tank 1, the top of the buffer tank 1 is provided with a plurality of reaction tubes 3, the reaction tubes 3 are provided with mesh tubes 4, and the mesh tubes 4 form an annular sandwich 6 in the reaction tubes 3. The upper end of the mesh tube 4 is connected to the bottom surface of the soda ash storage tank 2; The outer wall of the reaction tube 3 is provided with a phosphoric acid delivery tube 7 that connects to the interlayer 6.

[0018] In a preferred embodiment, the soda ash storage tank 2 is provided with multiple vertical rotating shafts 10, which extend into the mesh tube 4. The rotating shafts 10 located inside the mesh tube 4 are provided with spiral feeding blades 5.

[0019] In a preferred embodiment, the top of the soda ash storage tank 2 is provided with a drive motor 11, the drive motor 11 drives the shaft downward into the soda ash storage tank 2, and the upper end of the rotating shaft 10 is axially connected to the drive shaft of the drive motor 11.

[0020] In a preferred embodiment, the main pipeline of the phosphoric acid delivery pipe 7 is connected to the side wall of one of the reaction pipes 3, and a flow valve 9 is provided on the main pipeline; The phosphoric acid delivery pipe 7 is also provided with multiple branch pipes, which are respectively connected to the side wall of the remaining reaction pipe 3. A three-way flow valve 8 is provided at the connection between the branch pipe and the main pipe.

[0021] In a preferred embodiment, the bottom surface of the soda ash storage tank 2 forms multiple inverted cone regions, and the upper end of the mesh pipe 4 is located within the inverted cone regions.

[0022] In a preferred embodiment, the top surface of the buffer tank 1 is provided with a carbon dioxide output pipe 12, which is connected to a carbon dioxide storage tank 14. A vacuum pump is configured on the carbon dioxide storage tank 14 to achieve carbon dioxide suction. The buffer tank 1 is provided with a slurry output pipe 13 on the lower side wall. The slurry output pipe 13 is connected to the slurry storage tank 15. A slurry delivery pump is configured on the slurry output pipe 13.

[0023] In a preferred embodiment, the reaction tube 3, the mesh tube 4, the spiral feeding blade 5, and the rotating shaft 10 are made of 316L stainless steel, Hastelloy C-276, or PTFE-lined steel.

[0024] In the specific implementation process, taking the neutralization reaction of soda ash and phosphoric acid in the production of sodium tripolyphosphate as an example: Industrial-grade soda ash (purity ≥ 98.5%) is fed into soda ash storage tank 2 via a hoist until the tank level reaches 80%. Industrial phosphoric acid with a concentration of 85% is pumped into phosphoric acid storage tank to ensure that the tank level is maintained above 50%. At the same time, the stirring device of phosphoric acid storage tank is turned on to prevent phosphoric acid from separating.

[0025] First, the drive motor 11 is started, and the soda ash in the soda ash storage tank 2 is fed into the mesh tube 4 at a uniform speed through the spiral feeding blades 5. Under the force of gravity and the propulsion of the spiral blades, the soda ash falls evenly along the inner wall of the mesh tube 4 and diffuses into the interlayer 6 through the mesh holes of the mesh tube.

[0026] Start the phosphoric acid delivery pump, open the main pipeline flow valve 9, and set the total phosphoric acid flow rate to 1.2 m³ / h (corresponding to a mass flow rate of approximately 1.98 t / h for 85% phosphoric acid). Then, adjust the three-way flow valves 8 on each branch pipe to ensure a consistent phosphoric acid flow rate (0.3 m³ / h) within the interlayer 6 of each reaction tube 3. After entering the interlayer 6, the phosphoric acid comes into contact with the soda ash diffused from the mesh tube 4 in the annular space, undergoing a neutralization reaction. Na2CO3+2H3PO4=2NaH2PO4+CO2↑+H2O; The sodium dihydrogen phosphate slurry generated by the reaction flows downward along the inner wall of the reaction tube 3 under gravity, while the carbon dioxide gas generated by the reaction enters the buffer tank 1 along with the slurry. Gas-liquid separation occurs in the buffer tank 1, and the carbon dioxide gas rises to the top of the tank and is pumped to the carbon dioxide storage tank 14 through the carbon dioxide output pipe 12 under the action of a vacuum pump. The pumping pressure is controlled at -0.05 MPa. The separated slurry is temporarily stored in the buffer tank 1. When the liquid level reaches 60% of the tank height, the pneumatic diaphragm pump on the slurry output pipe 13 is activated to transport the slurry to the slurry storage tank 15, maintaining the liquid level in the buffer tank stable between 50% and 70%.

[0027] During the above operation, the following parameters are monitored and adjusted in real time: Slurry K-value control: Samples are taken from slurry output pipe 13 every 30 minutes to test the slurry's K-value (neutralization index). The normal range is 1.8-2.0. If the K-value is too low (<1.8), it indicates excessive phosphoric acid, and the phosphoric acid flow rate can be appropriately reduced (each adjustment should not exceed 5%). If the K-value is too high (>2.0), the phosphoric acid flow rate should be increased to ensure the slurry quality meets the requirements.

[0028] Carbon dioxide flow monitoring: CO2 production is monitored by a gas flow meter installed on carbon dioxide output pipe 12. If the flow rate drops abnormally, check whether reaction pipe 3 is blocked or whether the soda ash feed is interrupted. If the purity is insufficient, a water washing tower can be added before carbon dioxide storage tank 14 to remove a small amount of phosphoric acid droplets in the gas.

[0029] Equipment operating status: Monitor the current (normal range 10-12A) and temperature (≤80℃) of drive motor 11. If the current rises abnormally, it may be due to material jamming on the spiral feeder blade 5, requiring shutdown and cleaning. Check for leaks in all pipeline valves, especially the PTFE lining of the phosphate conveying pipe to ensure it is intact and prevent corrosion.

Claims

1. A carbon dioxide capture device for a neutralization reactor, characterized in that: Includes a buffer tank (1), the top of which is provided with multiple reaction tubes (3), and a mesh tube (4) is provided inside the reaction tube (3). A ring-shaped interlayer (6) is formed between the mesh tubes (4) inside the reaction tube (3). The upper end of the mesh tube (4) is connected to the bottom surface of the soda ash storage tank (2); The outer wall of the reaction tube (3) is provided with a phosphoric acid delivery tube (7) that connects to the interlayer (6).

2. The carbon dioxide capture device for a neutralization reactor according to claim 1, characterized in that: The soda ash storage tank (2) is equipped with multiple vertical rotating shafts (10), which extend into the mesh tube (4). The rotating shaft (10) located in the mesh tube (4) is equipped with spiral feeding blades (5).

3. The carbon dioxide capture device for a neutralization reactor according to claim 2, characterized in that: The top of the soda ash storage tank (2) is equipped with a drive motor (11). The drive motor (11) drives the shaft downward into the soda ash storage tank (2). The upper end of the rotating shaft (10) is axially connected to the drive shaft of the drive motor (11).

4. The carbon dioxide capture device for a neutralization reactor according to claim 1, characterized in that: The main pipeline of the phosphoric acid delivery pipe (7) is connected to the side wall of one of the reaction pipes (3), and a flow valve (9) is provided on the main pipeline. The phosphoric acid delivery pipe (7) is also provided with multiple branch pipes, which are respectively connected to the side wall of the remaining reaction pipe (3). A three-way flow valve (8) is provided at the connection between the branch pipe and the main pipe.

5. The carbon dioxide capture device for a neutralization reactor according to claim 1, characterized in that: The bottom surface of the soda ash storage tank (2) forms multiple inverted cone areas, and the upper end of the mesh tube (4) is located within the inverted cone area.

6. The carbon dioxide capture device for a neutralization reactor according to claim 1, characterized in that: The top surface of the buffer tank (1) is provided with a carbon dioxide output pipe (12), which is connected to a carbon dioxide storage tank (14). A vacuum pump is installed on the carbon dioxide storage tank (14). The buffer tank (1) is provided with a slurry output pipe (13) on the lower side wall. The slurry output pipe (13) is connected to the slurry storage tank (15). A slurry delivery pump is provided on the slurry output pipe (13).

7. The carbon dioxide capture device for a neutralization reactor according to claim 1, characterized in that: The reaction tube (3), mesh tube (4), spiral feed blade (5) and rotating shaft (10) are made of 316L stainless steel, Hastelloy C-276 or steel lined with PTFE.

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