Powder additive spraying device for improving dispersity of carbon black and application of powder additive spraying device

Abstract

The invention discloses a powder additive spraying device capable of improving dispersibility of carbon black and application, and relates to the technical field of carbon black production, a bottom outlet of a solution storage tank is connected with a blanking pipe of a shear pump, a discharge port of the shear pump is connected with a feed port of a Venturi tube, an air inlet of the Venturi tube is connected with atomized air, and the air inlet of the Venturi tube is connected with an air outlet of the solution storage tank. An outlet of the Venturi tube is connected with a spray gun through a metal hose, the spray gun is connected with the reaction furnace through a mechanical seal valve group, and a spray head section of the spray gun extends into the reaction furnace. The device solves the problems of online metering, quantitative conveying and poor atomization of boric acid, and can be applied to the same industry.

Description

Technical Field

[0001] The invention relates to the field of chemical production, in particular to the field of rubber production, and specifically to a powder additive injection device for improving the dispersibility of carbon black and its application. Background Art

[0002] Carbon black products are mainly used in rubber products, such as tire production, conductive materials, ink printing and other industries. Different industries have different requirements for carbon black product indicators and performance. Among them, the dispersion of carbon black refers to the uniform distribution of carbon black particles in the tire rubber, which has a significant impact on tire performance. For example, evenly dispersed carbon black can increase the contact area between the tire and the road, thereby improving grip and handling performance; increase tire wear resistance, reduce rolling resistance, improve fuel efficiency, and improve aging resistance. How to improve the dispersion of carbon black in tires is the main problem currently existing, and it is also a common problem in the current carbon black production field, and there is no effective technical means to solve this problem. Summary of the invention

[0003] In order to solve the problem of how to improve the dispersibility performance of carbon black, the present invention provides a powder auxiliary agent injection device for improving the dispersibility of carbon black and its application.

[0004] The present invention is implemented by the following technologies: The invention provides a powder additive injection device for improving the dispersibility of carbon black, comprising a solution storage tank, wherein the bottom outlet of the solution storage tank is connected to a feed pipe of a shear pump, the discharge port of the shear pump is connected to a feed port of a venturi tube, the air inlet of the venturi tube is connected to atomizing air, the outlet of the venturi tube is connected to a spray gun through a metal hose, the spray gun is connected to a reaction furnace through a mechanical sealing valve group, and a nozzle section of the spray gun extends into the reaction furnace.

[0005] During implementation, the method comprises a solution storage tank for storing raw materials, wherein the solution storage tank contains a powdered auxiliary agent, and the powdered auxiliary agent comprises 1 part of boric acid powder and 0.16-0.23 parts of propylene glycol.

[0006] Boron plays a dispersing role in the rubber production of carbon black. The molecular weight of boron is 10.833, accounting for 17.5% of boric acid. Because boric acid is a monobasic extremely weak acid substance, the source of its acidity is not the protons it gives itself. Since boron is an electron-deficient atom, it can add the hydroxide ions of water molecules and release protons. Taking advantage of this electron-deficient property, polyhydroxy compounds (such as glycerol and glycerol) are added to form stable complexes to strengthen its acidity. Therefore, in order to maximize the role of boric acid, boric acid must be configured in a certain proportion before use. The ionization equation of boric acid in water is: H3BO3+H2O=B(OH)4 - +H + Due to its weak acid properties, its ionization reaction is reversible, so it cannot be completely ionized by simply dissolving in water. In order to improve its ionization properties, a certain amount of propylene glycol is added to its aqueous solution to cause an esterification reaction, thereby reducing the concentration of borate ions and promoting boric acid ionization.

[0007] The bottom outlet of the solution storage tank is connected to the discharge pipe of the shear pump, which is used to shear and transport the boric acid material to the venturi tube. A liquid discharge valve is installed at the connection between the bottom outlet of the solution storage tank and the discharge pipe, which is used to control the discharge speed of the liquid in the solution storage tank, that is, the discharge speed and discharge amount of boric acid.

[0008] The discharge port of the shear pump is connected to the feed port of the venturi tube, and the air inlet of the venturi tube is connected to the atomizing air, that is, the air inlet of the venturi tube is connected to the compressed air source pipe. The venturi tube uses pneumatic conveying to generate negative pressure in the discharge pipe, thereby reducing the probability of boric acid hanging on the material, while increasing the boric acid flow rate and improving the boric acid atomization effect; the feed port of the shear pump is equipped with an online weighing instrument cascaded with the airtight valve speed control, which can realize automatic control according to the demand for boric acid.

[0009] The outlet of the venturi tube is connected to the spray gun through a metal hose, that is, the inlet end of the metal hose is connected to the outlet of the venturi tube, and the outlet end of the metal hose is connected to the inlet of the boric acid spray gun. The interfaces at both ends of the metal hose are connected by inner spherical seals to improve sealing performance.

[0010] The spray gun is connected to the reactor through a mechanical sealing valve group. The mechanical sealing valve group includes two threaded buckles installed between the reactor feeding pipe and the spray gun to ensure that the hot flue gas in the reactor cannot be sprayed out, ensure safe operation, prevent the high-temperature flue gas in the reactor from being sprayed out, avoid vibration and cause the spray gun to loosen, and the nozzle section of the spray gun extends into the reactor; a spray hole with a diameter of 10mm is arranged around the tube wall of the nozzle section of the spray gun, and the end of the nozzle section is closed to ensure that the boric acid powder can be evenly sprayed into the reactor to fully mix, contact and fuse with the carbon black flue gas; the other end of the spray gun is provided with a wire head connected to a metal hose.

[0011] The reaction furnace is a carbon black oil furnace cracking device, and the inner lining of the reaction furnace is made of high temperature resistant refractory material.

[0012] The present invention provides a method for producing carbon black using a powdered additive, which is implemented in the above-mentioned injection device and comprises the following steps: a. Preparation of additive solution Take 1 part of boric acid and 0.16~0.23 parts of propylene glycol, place them in a solution storage tank, and add water to 1m 3Fill up the solution storage tank. In actual use, prepare different concentrations of boric acid according to different product models. The amount of boric acid sprayed in the process of use must be strictly controlled, otherwise the ash content of the product will be too high and the quality will be unqualified. Mix for at least 6 hours to maximize the ionization of boron in the boric acid solution to obtain the additive solution; b. Coal tar cracking Coal tar is added into the reactor, natural gas is used as fuel, and it is mixed with air to burn to produce high-temperature flue gas of about 1920°C. The coal tar is atomized and then cracked; c. Spray in cold water Spray cold water into the reactor to directly contact the cracked coal tar to stop the cracking reaction. The temperature of the high-temperature flue gas after the reaction is 1600°C. d. Spray in secondary cold water Spray in secondary cooling water to cool the high-temperature flue gas to 800°C before it enters the air heat exchanger; e. Spray boric acid solution After the reaction is carried out to the second cooling, when the temperature drops to 600°C, the atomized boric acid solution is sprayed into the reactor; specifically, the liquid release valve is opened to control the auxiliary agent solution to enter the shear pump, and then enter the venturi tube, and driven by the atomized air, enter the spray gun through the metal hose from the outlet of the venturi tube, and then spray into the reactor from the nozzle of the spray gun; f. Collect Entering the collection process, the carbon black in the flue gas is collected, granulated and dried to form the final product of carbon black.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a powder additive injection device for improving the dispersibility of carbon black and its application. By injecting a powder additive during the carbon black production process, the dispersion performance of the carbon black product in rubber can be effectively improved. The injection amount can be accurately controlled according to product indicators to avoid unqualified product quality due to fluctuations in the injection amount.

[0014] This device solves the problems of online metering, quantitative delivery and poor atomization of boric acid and can be promoted and used in the same industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the device of the present invention.

[0016] Figure 2 This figure shows the distribution diagram of carbon black with a microscopic dispersion level of 4 in the present invention.

[0017] Figure 3 This figure shows the distribution diagram of carbon black having a microscopic dispersion level of 4.5 in the present invention.

[0018] Figure 4This figure shows the distribution diagram of carbon black with a microscopic dispersion level of 5 in the present invention.

[0019] Figure 5 This figure shows the distribution diagram of carbon black having a microscopic dispersion level of 5.5 in the present invention.

[0020] Figure 6 This figure shows the distribution diagram of carbon black with a microscopic dispersion level of 6 in the present invention.

[0021] In the figure: 1-solution storage tank, 2-liquid discharge valve, 3-shear pump, 4-venturi tube, 5-metal hose, 6-mechanical seal valve group, 7-spray gun, 8-reaction furnace. DETAILED DESCRIPTION

[0022] The specific embodiments of the present invention are described in detail below. Example 1

[0023] A powder additive injection device for improving the dispersibility of carbon black, such as Figure 1 As shown, the solution storage tank 1 is used to store raw materials. The solution storage tank 1 contains powder additives, which include 10 parts of boric acid powder and 1.75 parts of propylene glycol, by weight.

[0024] The bottom outlet of the solution storage tank 1 is connected to the discharge pipe of the shear pump 3, which is used to shear and transport the boric acid material to the venturi tube 4. A liquid discharge valve 2 is installed at the connection between the bottom outlet of the solution storage tank 1 and the discharge pipe, which is used to control the discharge speed of the liquid in the solution storage tank, that is, the discharge speed and discharge amount of boric acid.

[0025] The discharge port of the shear pump 3 is connected to the feed port of the venturi tube 4, and the air inlet of the venturi tube 4 is connected to the atomizing air, that is, the air inlet of the venturi tube 4 is connected to the compressed air source pipe. The venturi tube 4 generates negative pressure in the discharge pipe through pneumatic conveying, thereby reducing the probability of boric acid hanging on the material, and at the same time increasing the boric acid flow rate and improving the boric acid atomization effect; the feed port of the shear pump 3 is equipped with an online weighing instrument which is cascade-controlled with the airtight valve speed, and can realize automatic control according to the demand for boric acid.

[0026] The outlet of the venturi tube 4 is connected to the spray gun 7 through the metal hose 5, that is, the inlet end of the metal hose 5 is connected to the outlet of the venturi tube 4, and the outlet end of the metal hose 5 is connected to the inlet of the boric acid spray gun 7. The interfaces at both ends of the metal hose 5 are connected by inner spherical sealing to improve the sealing performance.

[0027] The spray gun 7 is connected to the reactor 8 through a mechanical sealing valve group 6. The mechanical sealing valve group 6 includes two threaded buckles installed between the feeding pipe of the reactor 8 and the spray gun 7 to ensure that the hot flue gas in the reactor cannot be sprayed out, ensure safe operation, prevent the high-temperature flue gas in the reactor from spraying out, and avoid vibration that causes the spray gun 7 to loosen. The nozzle section of the spray gun 7 extends into the reactor 8; a spray hole with a diameter of 10 mm is arranged around the tube wall of the nozzle section of the spray gun 7, and the end of the nozzle section is closed to ensure that the boric acid powder can be evenly sprayed into the reactor to fully mix, contact and fuse with the carbon black flue gas; the other end of the spray gun 7 is provided with a wire head connected to the metal hose 5.

[0028] The reaction furnace 8 is a carbon black oil furnace cracking device, and the inner lining of the reaction furnace 8 is a high temperature resistant refractory material. Example 2

[0029] A method for producing carbon black with a powder additive that improves the dispersibility of carbon black. In this embodiment, the volume of the solution storage tank is 1m 3 For example, the following steps are included: a. Preparation of additive solution Take 10kg of boric acid and add it to the solution storage tank. The concentration of boric acid in the tank is 10kg / tank. The mass of boron in the tank is as follows: m 硼 =M 硼 / M 硼酸 ×m 硼酸 =10.833 / 61.833×10=1.75kg Where: m 硼 ——The mass of boron in the tank.

[0030] M 硼 ——Molecular weight of boric acid.

[0031] M 硼酸 ——Molecular weight of boron.

[0032] m 硼酸 ——The mass of boron in the tank.

[0033] The amount of glycerol added is calculated based on the mass of boron in the tank to ensure maximum ionization of boron without affecting glycerol consumption; m 丙三醇 = m 硼 / (M 丙三醇 / M 硼酸 )=1.75 / (92 / 61.833)=1.17kg Where: m 丙三醇 ——The mass of glycerol in the tank.

[0034] M 丙三醇——Molecular weight of propylene glycol.

[0035] Continue to add 1.75kg of propylene glycol to the solution storage tank, and add water to 1m 3 , mixing for 6 hours to ionize the boron in the boric acid solution to the maximum extent, thereby obtaining an auxiliary solution, i.e., a boric acid solution ionized to the maximum extent; b. Coal tar cracking Coal tar is added into the reaction furnace 8, and natural gas is used as fuel, and mixed with air to burn to produce high-temperature flue gas of about 1920°C, and the coal tar is atomized and then cracked; c. Spray in cold water Spray cold water into the reaction furnace 8 to directly contact the cracked coal tar to stop the cracking reaction. The temperature of the high-temperature flue gas after the stop is 1600°C. d. Spray in secondary cold water Spray in secondary cooling water to cool the high-temperature flue gas to 800°C before it enters the air heat exchanger; e. Spray boric acid solution After the reaction is carried out to the second cooling, when the temperature drops to 600°C, open the liquid release valve 2, control the auxiliary agent solution to enter the shear pump 3, and then enter the venturi tube 4. Driven by the atomizing air, it enters the spray gun 7 from the outlet of the venturi tube 4 through the metal hose 5, and the atomized boric acid solution is sprayed into the reaction furnace 8 from the nozzle of the spray gun 7; it is necessary to strictly control its spraying into the reaction furnace. After the second cooling, the temperature in the furnace makes the boric acid solution vaporize quickly, so that the ionized boron can contact with the carbon black powder to the maximum extent, so that the primary structure of the carbon black aggregate changes, and then the carbon black is better integrated with the rubber during use, so that it is more evenly dispersed; f. Collect Entering the collection process, the carbon black in the flue gas is collected, granulated and dried to form the final product of carbon black.

[0036] Nine samples were taken to test the prepared rubber products, to detect the dispersion of carbon black in the rubber, and to perform microscopic testing on the carbon black distribution, such as Figures 2~6 shown.

[0037]

[0038] The test results are shown in the table above. In the rubber products prepared by the injection device and application of the present invention, the device can effectively spray the boric acid solution into the reaction furnace to fully contact with the carbon black. In the actual rubber application process, different proportions of boric acid concentration have different effects on the dispersion degree of carbon black in the rubber. The required proportion can be adjusted according to actual production needs, thereby improving the dispersion degree of carbon black in the rubber and improving the quality of the rubber product.

[0039] The scope of protection claimed by the present invention is not limited to the above specific embodiments. For those skilled in the art, the present invention may have various deformations and changes. Any modifications, improvements and equivalent substitutions made within the concept and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A powder additive injection device for improving the dispersibility of carbon black, characterized in that: The invention comprises a solution storage tank (1), wherein the bottom outlet of the solution storage tank (1) is connected to the feed pipe of a shear pump (3), the discharge port of the shear pump (3) is connected to the feed port of a venturi tube (4), the air inlet of the venturi tube (4) is connected to atomizing air, the outlet of the venturi tube (4) is connected to a spray gun (7) through a metal hose (5), the spray gun (7) is connected to a reaction furnace (8) through a mechanical sealing valve group (6), and the nozzle section of the spray gun (7) extends into the reaction furnace (8).

2. A powder additive injection device for improving the dispersibility of carbon black according to claim 1, characterized in that: The solution storage tank (1) contains a powdered auxiliary agent.

3. A powder additive injection device for improving the dispersibility of carbon black according to claim 2, characterized in that: The powder auxiliary agent includes 1 part of boric acid powder and 0.16-0.23 parts of propylene glycol.

4. A powder additive injection device for improving the dispersibility of carbon black according to claim 1, characterized in that: A liquid discharge valve (2) is installed at the connection between the bottom outlet of the solution storage tank (1) and the discharge pipe.

5. A powder additive injection device for improving the dispersibility of carbon black according to claim 1, characterized in that: The interfaces at both ends of the metal hose (5) are connected by inner spherical sealing.

6. A powder additive injection device for improving the dispersibility of carbon black according to claim 1, characterized in that: The mechanical seal valve assembly (6) comprises two threaded female buckles installed between the feed pipe of the reaction furnace (8) and the spray gun (7).

7. A powder additive injection device for improving the dispersibility of carbon black according to claim 1, characterized in that: The nozzle section of the spray gun (7) is provided with spray holes around its wall, and the end of the nozzle section is closed; the other end of the spray gun (7) is provided with a thread head connected to the metal hose (5).

8. A powder additive injection device for improving the dispersibility of carbon black according to claim 1, characterized in that: The feed inlet of the shear pump (3) is equipped with an online weighing instrument which is cascade-controlled with the airtight valve speed.

9. A method for producing carbon black using a powdered additive, the method being implemented in the injection device according to claims 2 to 7, characterized in that: The following steps are involved: a. Preparation of additive solution Take 1 part of boric acid and 0.16~0.23 parts of propylene glycol, place them in a solution storage tank (1), and add water to 1m 3 , mixing for at least 6 hours to ionize the boron in the boric acid solution to the maximum extent, thereby obtaining an additive solution; b. Coal tar cracking Coal tar is added into the reaction furnace (8), and natural gas is used as fuel, and mixed with air to burn to generate high-temperature flue gas of about 1920°C, and the coal tar is atomized and then cracked; c. Spray in cold water Spraying cold water into the reaction furnace (8) to directly contact the cracked coal tar to stop the cracking reaction. The temperature of the high-temperature flue gas after the stop is 1600°C; d. Spray in secondary cold water Spray in secondary cooling water to cool the high-temperature flue gas to 800°C before it enters the air heat exchanger; e. Spray boric acid solution After the reaction is carried out to the second cooling stage, when the temperature drops to 600°C, atomized boric acid solution is sprayed into the reaction furnace (8); f. Collect Entering the collection process, the carbon black in the flue gas is collected, granulated and dried to form the final product of carbon black.

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