System for preparing white carbon black by using carbon dioxide gas generated by biogas

Abstract

The utility model discloses a system for preparing white carbon black by using carbon dioxide gas generated by biogas, which comprises a reaction system, a liquid mixing system and a slurry treatment system, and the liquid mixing system and the slurry treatment system are respectively communicated with the reaction system; the reaction system comprises a reaction kettle, a carbon dioxide storage device and a steam generator; the liquid mixing system comprises a sodium silicate solution storage device, a process water storage device, a liquid mixing tank and a mixed liquid storage tank; and the slurry treatment system comprises a slurry transfer tank and a filter press. According to the utility model, carbon dioxide gas generated by biological natural gas is used for preparing white carbon black, so that resource utilization of wastes and circulation and reutilization of sodium carbonate mother liquor can be realized.

Description

Technical Field

[0001] This utility model belongs to the field of silica preparation, specifically relating to a system for preparing silica using carbon dioxide gas generated from biogas. Background Technology

[0002] There are two methods for producing silica: dry pyrolysis and wet precipitation. When using wet precipitation to produce silica, inorganic acids such as sulfuric acid and hydrochloric acid are needed as precipitants. This process suffers from high precipitant consumption and the inability to treat the waste acid generated after the reaction. Among wet precipitation methods, carbon dioxide precipitation is the lowest-cost method for producing silica; however, current technology has not yet developed a complete system for using carbon dioxide as a precipitant in silica production. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a system for preparing silica using carbon dioxide gas generated from biogas, which addresses the shortcomings of the prior art. The preparation of silica using carbon dioxide gas generated from biogas can realize the resource utilization of waste and the recycling and reuse of sodium carbonate mother liquor.

[0004] The technical solution adopted in this utility model is: a system for preparing precipitated silica using carbon dioxide gas generated from biogas, comprising a reaction system, a mixing system and a slurry treatment system, wherein the mixing system and the slurry treatment system are respectively connected to the reaction system;

[0005] The reaction system includes a reaction vessel, a carbon dioxide storage device, and a steam generator, both of which are connected to the reaction vessel via pipelines.

[0006] The mixing system includes a sodium silicate solution storage device, a process water storage device, a mixing tank, and a mixed liquid storage tank. The sodium silicate solution storage device and the process water storage device are both connected to the mixing tank through pipelines. The mixing tank is connected to the mixed liquid storage tank through pipelines. The mixed liquid storage tank is connected to the reaction vessel through pipelines. A metering pump is installed on the pipeline connecting the mixed liquid storage tank and the reaction vessel.

[0007] The slurry treatment system includes a slurry transfer tank and a filter press. The slurry transfer tank is connected to the reactor and the filter press via pipelines. A filter pump is installed on the pipeline connecting the slurry transfer tank and the filter press.

[0008] In one embodiment, a recovery system is also included, which includes a recovery liquid transfer tank connected to a filter press and a sodium silicate solution storage device via pipelines.

[0009] In one embodiment, the reaction vessel and the mixing tank are respectively provided with a first stirring assembly and a second stirring assembly extending into their interiors.

[0010] In one embodiment, the sodium silicate solution storage device and the process water storage device are respectively provided with sodium silicate solution replenishment pipe and process water replenishment pipe communicating with their interiors.

[0011] In one embodiment, the reactor is equipped with a thermometer and a pressure gauge.

[0012] In one embodiment, pressure gauges are provided on the pipeline connecting the reactor and the steam generator, the pipeline connecting the reactor and the mixed liquid storage tank, and the pipeline connecting the slurry transfer tank and the filter press.

[0013] In one embodiment, a thermometer is installed on the pipeline connecting the reactor and the steam generator.

[0014] In one embodiment, the process water storage device, the mixed liquor storage tank, and the slurry transfer tank are all equipped with level gauges.

[0015] In one embodiment, flow meters are installed on the pipeline connecting the sodium silicate solution storage device and the mixing tank, the pipeline connecting the process water storage device and the mixing tank, and the pipeline connecting the mixing tank and the mixed liquid storage tank.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1. The reaction system, mixing system, and slurry treatment system are used for the reaction, reaction agent adjustment, and slurry treatment in the process of preparing silica, respectively. The three are organically combined to effectively complete the preparation of silica.

[0018] 2. Utilize carbon dioxide gas generated from natural gas as a precipitant in the preparation of silica to achieve resource utilization of waste;

[0019] 3. The set-up recycling system can recover the sodium carbonate mother liquor formed by solid-liquid separation, realizing recycling and reuse. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] In the diagram: 1. Reactor; 2. Carbon dioxide storage device; 3. Steam generator; 4. Sodium silicate solution storage device; 5. Process water storage device; 6. Mixing tank; 7. Mixed liquid storage tank; 8. Metering pump; 9. Slurry transfer tank; 10. Filter press; 11. Filter pump; 12. Recovered liquid transfer tank; 13. Piping; 14. Pressure gauge; 15. Thermometer; 16. Level gauge; 17. Flow meter; 18. Sodium silicate solution replenishment pipe; 19. Process water replenishment pipe; 101. First stirring assembly; 601. Second stirring assembly. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1 As shown, this utility model discloses a system for preparing precipitated silica using carbon dioxide gas generated from biogas, including a reaction system, a mixing system, and a slurry treatment system, wherein the mixing system and the slurry treatment system are respectively connected to the reaction system;

[0024] The reaction system includes a reaction vessel 1, a carbon dioxide storage device 2, and a steam generator 3. The carbon dioxide storage device 2 and the steam generator 3 are both connected to the reaction vessel 1 through a pipeline 13.

[0025] The mixing system includes a sodium silicate solution storage device 4, a process water storage device 5, a mixing tank 6, and a mixed liquid storage tank 7. The sodium silicate solution storage device 4 and the process water storage device 5 are both connected to the mixing tank 6 through a pipeline 13. The mixing tank 6 is connected to the mixed liquid storage tank 7 through a pipeline 13. The mixed liquid storage tank 7 is connected to the reactor 1 through a pipeline 13. A metering pump 8 is installed on the pipeline 13 connecting the mixed liquid storage tank 7 and the reactor 1.

[0026] The slurry treatment system includes a slurry transfer tank 9 and a filter press 10. The slurry transfer tank 9 is connected to the reactor 1 and the filter press 10 respectively through a pipeline 13. A filter pump 11 is installed on the pipeline 13 connecting the slurry transfer tank 9 and the filter press 10.

[0027] In this embodiment, a recycling system is also included, which includes a recycling liquid transfer tank 12. The recycling liquid transfer tank 12 is connected to a filter press 10 and a sodium silicate solution storage device 4 via pipelines 13.

[0028] In this embodiment, the reaction vessel 1 and the mixing tank 6 are respectively provided with a first stirring assembly 101 and a second stirring assembly 601 extending into their interiors.

[0029] In this embodiment, the sodium silicate solution storage device 4 and the process water storage device 5 are respectively provided with a sodium silicate solution replenishment pipe 18 and a process water replenishment pipe 19 that are connected to their interiors.

[0030] In this embodiment, the reaction vessel 1 is equipped with a thermometer 15 and a pressure gauge 14.

[0031] In this embodiment, pressure gauges 14 are provided on the pipeline 13 connecting the reactor 1 and the steam generator 3, the pipeline 13 connecting the reactor 1 and the mixed liquid storage tank 7, and the pipeline 13 connecting the slurry transfer tank 9 and the filter press 10.

[0032] In this embodiment, a thermometer 15 is provided on the pipeline 13 connecting the reactor 1 and the steam generator 3.

[0033] In this embodiment, the process water storage device 5, the mixed liquid storage tank 7, and the slurry transfer tank 9 are all equipped with level gauges 16.

[0034] In this embodiment, flow meters 17 are provided on the pipeline 13 connecting the sodium silicate solution storage device 4 and the mixing tank 6, the pipeline 13 connecting the process water storage device 5 and the mixing tank 6, and the pipeline 13 connecting the mixing tank 6 and the mixed liquid storage tank 7.

[0035] In this system, carbon dioxide storage device 2 is used to store carbon dioxide gas produced from biogas. Carbon dioxide storage device 2 can be connected to the biogas system, or it can be used to store carbon dioxide gas produced from biogas through other transfer methods. The carbon dioxide gas stored in carbon dioxide storage device 2 needs to be purified and pressurized before subsequent reactions.

[0036] The sodium silicate solution storage device 4 and the process water storage device 5 are used to store sodium silicate solution and process water, respectively, and the two are replenished through sodium silicate solution replenishment pipe 18 and process water replenishment pipe 19, respectively.

[0037] Mixing tank 6 is used to premix sodium silicate solution and process water. According to the processing requirements of precipitated silica, the sodium silicate solution and process water are injected into mixing tank 6 in the required proportions. The second stirring component 601 agitates the sodium silicate solution and process water, ensuring uniform mixing and forming a mixture. This premixing helps to guarantee a more complete reaction with carbon dioxide gas later. The mixed solution is then temporarily stored in mixing tank 7.

[0038] When the system produces silica, the reaction temperature, pH value at which carbon dioxide gas injection stops, and holding time are set according to production requirements. At the start of production, a pre-mixed solution stored in the mixed solution storage tank 7 is injected into the reactor 1 via metering pump 8. The first stirring assembly 101 is started, and the steam generator 3 is started to inject high-temperature steam into the reactor 1, raising the reactor 1 to the reaction temperature. Carbon dioxide gas is then injected into the reactor 1 to initiate a precipitation reaction. During the precipitation reaction, the pH value is controlled until the carbon dioxide gas injection stops, at which point the injection stops. The temperature inside the reactor 1 is maintained until the holding time is reached, at which point the reaction ends, and the resulting slurry enters the slurry treatment system.

[0039] After the reaction is complete, the slurry first enters the slurry transfer tank 9 for cooling. The cooled slurry is then pumped into the filter press 10 by the filter pump 11, where solid-liquid separation occurs. This separation forms a filter cake and sodium carbonate mother liquor. The filter cake is removed and dried to obtain the silica product, while the sodium carbonate mother liquor enters the recovery liquid transfer tank 12. Depending on the condition of the sodium carbonate mother liquor, if further treatment is required, it is treated in the recovery liquid transfer tank 12 and then reinjected into the sodium silicate solution storage device 4 for recycling.

[0040] The pressure gauge 14 in this system is used to obtain the operating pressure of the system in real time to ensure the safe operation of the system. The thermometer 15, level gauge 16 and flow meter 17 are used to obtain temperature, level and flow rate in real time. The obtained temperature, level and flow rate can be used to evaluate the stability of the system operation, so as to adjust the system parameters according to the operating conditions.

[0041] The embodiments described above merely illustrate specific implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A system for preparing silica using carbon dioxide gas generated from biogas, characterized in that: It includes a reaction system, a mixing system, and a slurry treatment system, wherein the mixing system and the slurry treatment system are respectively connected to the reaction system; The reaction system includes a reaction vessel (1), a carbon dioxide storage device (2) and a steam generator (3), and the carbon dioxide storage device (2) and the steam generator (3) are connected to the reaction vessel (1) through a pipeline (13); The mixing system includes a sodium silicate solution storage device (4), a process water storage device (5), a mixing tank (6), and a mixed liquid storage tank (7). The sodium silicate solution storage device (4) and the process water storage device (5) are both connected to the mixing tank (6) through a pipeline (13). The mixing tank (6) is connected to the mixed liquid storage tank (7) through a pipeline (13). The mixed liquid storage tank (7) is connected to the reactor (1) through a pipeline (13). A metering pump (8) is provided on the pipeline (13) connecting the mixed liquid storage tank (7) and the reactor (1). The slurry processing system includes a slurry transfer tank (9) and a filter press (10). The slurry transfer tank (9) is connected to the reactor (1) and the filter press (10) respectively through a pipeline (13). A filter pump (11) is provided on the pipeline (13) connecting the slurry transfer tank (9) and the filter press (10).

2. The system for preparing silica using carbon dioxide gas generated from biogas according to claim 1, characterized in that: It also includes a recycling system, which includes a recycling liquid transfer tank (12), which is connected to a filter press (10) and a sodium silicate solution storage device (4) via pipelines (13).

3. The system for preparing silica from carbon dioxide gas generated from biogas according to claim 1 or 2, characterized in that: The reactor (1) and the mixing tank (6) are respectively provided with a first stirring assembly (101) and a second stirring assembly (601) extending into their interiors.

4. The system for preparing silica from carbon dioxide gas generated from biogas according to claim 1 or 2, characterized in that: The sodium silicate solution storage device (4) and the process water storage device (5) are respectively provided with a sodium silicate solution replenishment pipe (18) and a process water replenishment pipe (19) that are connected to their interiors.

5. The system for preparing silica using carbon dioxide gas generated from biogas according to claim 3, characterized in that: The reactor (1) is equipped with a thermometer (15) and a pressure gauge (14).

6. The system for preparing silica using carbon dioxide gas generated from biogas according to claim 5, characterized in that: Pressure gauges (14) are provided on the pipeline (13) connecting the reactor (1) and the steam generator (3), the pipeline (13) connecting the reactor (1) and the mixed liquid storage tank (7), and the pipeline (13) connecting the slurry transfer tank (9) and the filter press (10).

7. The system for preparing silica using carbon dioxide gas generated from biogas according to claim 6, characterized in that: A thermometer (15) is installed on the pipeline (13) connecting the reactor (1) and the steam generator (3).

8. The system for preparing silica from carbon dioxide gas generated from biogas according to claim 7, characterized in that: The process water storage device (5), the mixed liquid storage tank (7) and the slurry transfer tank (9) are all equipped with level gauges (16).

9. The system for preparing silica from carbon dioxide gas generated from biogas according to claim 8, characterized in that: A flow meter (17) is installed on the pipeline (13) connecting the sodium silicate solution storage device (4) and the mixing tank (6), the pipeline (13) connecting the process water storage device (5) and the mixing tank (6), and the pipeline (13) connecting the mixing tank (6) and the mixed liquid storage tank (7).

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