A method and system for high pressure steam acetylene carbon black prilling

Abstract

The application provides a high-pressure steam acetylene black granulation method and system, which comprises a soaking device, a cooling device and a granulation device. First, acetylene black and high-pressure steam are fed to be mixed and soaked; the soaked acetylene black is cooled to a first temperature; and the cooled acetylene black is granulated by feeding a granulation medium, and the temperature of the granulation medium is a second temperature; wherein the first temperature is 50-90 DEG C, and the second temperature is 50-90 DEG C. The acetylene black is mixed with the high-pressure steam, the high-pressure steam is soaked into the acetylene black after mixing, the soaked acetylene black is cooled to the first temperature, the cooled acetylene black is granulated by feeding the granulation medium, the temperature of the granulation medium is the second temperature, and experiments show that, by cooling the acetylene black soaked with the high-pressure steam to a temperature equal to or close to the temperature of the granulation medium, the oil absorption value of the granular acetylene black can be increased from 240 ml / L to 268 ml / L, and the use range of the acetylene black is expanded.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon black granulation, in particular to a high-pressure steam acetylene carbon black granulation method and system. BACKGROUND

[0002] Acetylene carbon black (also known as acetylene black) is a carbon black obtained by continuous pyrolysis of acetylene with a purity of more than 99% obtained by decomposition of by-product gas during the pyrolysis of calcium carbide or naphtha (crude gasoline). Compared with furnace carbon black, its crystallization and secondary structure are more developed, so its electrical conductivity and liquid absorption are also more excellent. Because of less heavy metal impurities, the loss caused by self-discharge is small. It is mainly used for nickel-hydrogen battery negative electrode, and can also be used for super capacitor as a conductor.

[0003] In order to facilitate transportation and improve the comprehensive performance of acetylene carbon black, so that acetylene carbon black can be widely used in new lead-acid batteries, primary and secondary lithium batteries, and ultra-high voltage cables, etc., acetylene carbon black needs to be granulated. Due to the high structure of acetylene carbon black, dry granulation process is difficult to achieve. Wet granulation process is the main technology for acetylene carbon black granulation at present. For example, a carbon black wet granulation method and a carbon black wet granulation manufacturing system are disclosed in Chinese patent CN104371380A, and it is specifically disclosed that the carbon black powder material output by the quantitative feeder is continuously fed into the high-speed stirring tooth granulator, and the binder input by the binder supply system is fully contacted in the granulator to realize mixing, granulation, spheroidization and densification.

[0004] Although the above-mentioned carbon black wet granulation method and carbon black wet granulation manufacturing system have initially realized the granulation of acetylene carbon black, during the granulation process, honey or lignocellulose is added as a binder, which indirectly introduces impurities, affecting the purity of acetylene carbon black, and cannot meet the requirements of some products.

[0005] In order to solve the above technical problems, a granular conductive carbon black and its preparation method are disclosed in Chinese patent CN110437650A. The conductive carbon black raw material is first wetted by water with a temperature of ≥80℃ to enhance the hydrophilic property of the conductive carbon black raw material, and then granulated by wet granulation and dried to obtain granular conductive acetylene carbon black with uniform particle size distribution. Further, the conductive carbon black raw material is introduced into the soaking device together with water vapor or water, and nitrogen is introduced to balance the pressure in the soaking device. Then, the conductive carbon black raw material wetted by water vapor or water is transported into the wet granulator, and deionized water is added to the wet granulation process.

[0006] In the above invention, the infiltration method using steam as the infiltration medium is provided, and the oil absorption value of the obtained product is finally 232ml / L-235ml / L, which is low and limits the use range of acetylene carbon black. SUMMARY

[0007] Therefore, the present application provides a high-pressure steam acetylene carbon black granulation method and system to solve the technical problem of the low oil absorption value of the product obtained by the infiltration method using steam as the infiltration medium provided in the prior art.

[0008] The technical solution adopted by the present application to solve the above technical problems is as follows:

[0009] A high-pressure steam acetylene carbon black granulation method, comprising the following steps:

[0010] a. feeding acetylene carbon black and high-pressure steam to mix and infiltrate the acetylene carbon black and the high-pressure steam;

[0011] b. cooling the infiltrated acetylene carbon black to a first temperature;

[0012] c. introducing a granulation medium into the cooled acetylene carbon black to perform granulation, wherein the temperature of the granulation medium is a second temperature;

[0013] wherein the first temperature is 50-90℃, and the second temperature is 50-90℃.

[0014] Preferably, the first temperature and the second temperature are equal.

[0015] Preferably, in step a, the pressure of the high-pressure steam in the process of feeding the acetylene carbon black and the high-pressure steam to mix and infiltrate the acetylene carbon black and the high-pressure steam is 1.8-2.5MPa.

[0016] Preferably, in step a, the acetylene carbon black is also preheated, and the temperature of the preheated acetylene carbon black is a third temperature, wherein the third temperature is 80-150℃.

[0017] Preferably, the granulation medium is pure water.

[0018] A high-pressure steam acetylene carbon black granulation system, comprising:

[0019] a preheating device for preheating the acetylene carbon black;

[0020] an infiltration device provided with an infiltration medium feeding port and a high-pressure steam inlet pipe for mixing and infiltrating the acetylene carbon black;

[0021] a cooling device connected to the infiltration device for cooling the infiltrated acetylene carbon black;

[0022] A granulating device is connected to the cooling device and used to granulate the cooled acetylene carbon black.

[0023] Preferably, the infiltrating device comprises an infiltrating section and a separating and cooling section, the separating and cooling section is provided with a centrifugal separator used to settle the acetylene carbon black, and the centrifugal separator is further provided with a first discharging assembly, and the first discharging assembly is provided with a first temperature sensor used to detect the temperature of the infiltrated acetylene carbon black.

[0024] Preferably, the granulating device is provided with a second discharging assembly, and the second discharging assembly is provided with a second temperature sensor used to detect the temperature of the cooled acetylene carbon black.

[0025] Preferably, the infiltrating section is provided with an acetylene carbon black feeding pipe used to feed the acetylene carbon black into the infiltrating device, and the acetylene carbon black and the high-pressure steam are fully mixed in the infiltrating device to form a mixture of the acetylene carbon black and the high-pressure steam, and the infiltrating device is provided with a mixture discharging pipe connected to the inlet end of the centrifugal separator.

[0026] Preferably, the front end of the infiltrating section is provided with a mixing chamber used to mix the acetylene carbon black and the high-pressure steam, and the rear end of the mixing chamber is provided with a conveying chamber, and the conveying chamber is provided with a screw feeder used to convey the powdery acetylene carbon black settled at the bottom of the infiltrating device to the first discharging assembly.

[0027] Compared with the prior art, the present application has at least the following advantages:

[0028] The present application provides a high-pressure steam acetylene carbon black granulating method and system, which comprises the following steps: firstly, mixing the acetylene carbon black and the high-pressure steam, then infiltrating the acetylene carbon black with the high-pressure steam, cooling the infiltrated acetylene carbon black to a first temperature, feeding a granulating medium into the cooled acetylene carbon black, and granulating the acetylene carbon black, wherein the temperature of the granulating medium is a second temperature, and experiments show that, by cooling the acetylene carbon black infiltrated with the high-pressure steam to a temperature equal to or close to the temperature of the granulating medium, the oil absorption value of the granular acetylene carbon black can be increased from 240 ml / L to 268 ml / L, thereby expanding the use range of the acetylene carbon black. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 FIG. 1 is a structural schematic view of a high-pressure steam acetylene carbon black granulating system according to the present application.

[0030] In the diagram: High-pressure steam acetylene black granulation system 10, preheating device 100, impregnation device 200, impregnation medium inlet 210, high-pressure steam inlet pipe 211, impregnation section 220, acetylene black feed pipe 221, mixture outlet pipe 230, mixing chamber 240, conveying chamber 250, screw conveyor 251, separation and cooling section 260, centrifugal separator 270, first discharge assembly 280, first temperature sensor 281, granulation device 300, second discharge assembly 310, second temperature sensor 311. Detailed Implementation

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] In one specific embodiment of the present invention, a method for granulating high-pressure steam acetylene carbon black includes the following steps:

[0033] The acetylene black and high-pressure steam are fed together, which mixes and impregnates the acetylene black with the high-pressure steam.

[0034] Preferably, acetylene black with an oil absorption value ≥240 ml / L and an iodine adsorption capacity of 60–100 mg / g is used as raw material, and the mass ratio of carbon black raw material to the introduced high-pressure steam is 3:5–4.5:5. The acetylene black and high-pressure steam are mixed to form a mixture of high-pressure steam and acetylene black, and the high-pressure steam impregnates the acetylene black.

[0035] Cool the impregnated acetylene black to the first temperature;

[0036] Generally, since high-pressure steam and acetylene black are mixed, the high-pressure steam impregnates the acetylene black. The temperature of the impregnated acetylene black is 100℃~150℃. If the temperature of the impregnated acetylene black is too high, the temperature of the impregnated acetylene black is cooled down and kept at the same temperature as the granulation medium.

[0037] Granulation medium is introduced into the cooled acetylene black to carry out granulation, wherein the temperature of the granulation medium is the second temperature;

[0038] In this invention, in order to effectively improve the oil absorption value of acetylene black, preferably, the first temperature is 50℃~90℃ and the second temperature is 50℃~90℃. More preferably, the first temperature and the second temperature are equal, at which point the oil absorption value of acetylene black is the highest.

[0039] In a preferred embodiment, in step a, the step of "feeding acetylene black and high-pressure steam, so that the acetylene black and high-pressure steam are mixed and impregnated" preferably has a pressure of 1.8 MPa to 2.5 MPa. After the high-pressure steam and acetylene black are mixed, the high-pressure steam impregnates the acetylene black.

[0040] In a preferred embodiment, step a further includes preheating the acetylene black. The temperature of the preheated acetylene black is a third temperature, preferably 80°C to 150°C. High-pressure steam and acetylene black are mixed. The acetylene black is preheated first. Experiments show that the preheated acetylene black has a better DBP oil absorption value.

[0041] In a preferred embodiment, the granulation medium is pure water.

[0042] Preferably, the temperature of the pure water is 80℃, and the amount of pure water and the amount of acetylene black are introduced into the granulation device 300 at a mass ratio of 5:2 to 4:2 to granulate the acetylene black. The acetylene black and pure water are in full contact to achieve the processes of mixing, granulation, balling, and densification, so as to obtain granular acetylene black.

[0043] In another specific embodiment of the present invention, a high-pressure steam acetylene carbon black granulation method includes: a preheating device 100, an impregnation device 200, a cooling device, and a granulation device 300.

[0044] The preheating device 100 is used to preheat acetylene black;

[0045] The impregnation device 200 is provided with an impregnation medium inlet 210 and a high-pressure steam inlet pipe 211 for impregnating acetylene carbon black.

[0046] The cooling device is connected to the impregnation device 200 and is used to cool the impregnated acetylene carbon black.

[0047] The granulation device 300 is connected to the separation device and is used to granulate the cooled acetylene black.

[0048] This invention provides a high-pressure steam acetylene black granulation method and system, comprising first mixing acetylene black and high-pressure steam to form a mixture of acetylene black and high-pressure steam, impregnating the acetylene black with the mixed high-pressure steam, cooling the impregnated acetylene black to a first temperature, and then introducing a granulation medium into the cooled acetylene black to granulate it. The temperature of the granulation medium is a second temperature. Experiments show that by cooling the acetylene black impregnated with high-pressure steam to a temperature equal to or close to the temperature of the granulation medium, the oil absorption value of granulated acetylene black can be increased from 240 ml / L to 268 ml / L, thus expanding the application range of acetylene black.

[0049] In a preferred embodiment, the impregnation device 200 includes an impregnation section 220 and a separation and cooling section 260. The separation and cooling section 260 is equipped with a centrifugal separator 270 for settling acetylene black. The centrifugal separator 270 is also equipped with a first discharge assembly 280, which is equipped with a first temperature sensor 281 for detecting the temperature of the impregnated acetylene black.

[0050] A mixture of acetylene black and high-pressure steam is fed to centrifuge 270, where the mixture undergoes gas-solid separation, causing the solid acetylene black to settle and the exhaust gas to be recovered. A first temperature sensor 281 is used to detect the temperature of the impregnated acetylene black.

[0051] In a preferred embodiment, the granulation device 300 is provided with a second discharge component 310, and the second discharge component 310 is provided with a second temperature sensor 311, which is used to detect the temperature of the cooled acetylene black.

[0052] Based on the set process temperature, the temperature of the acetylene black after cooling is detected and reported back.

[0053] In a preferred embodiment, the impregnation device 200 is provided with an acetylene black feed pipe 221, which is used to introduce acetylene black into the impregnation device 200. The acetylene black and high-pressure steam are fully mixed in the impregnation device 200 to form a mixture of acetylene black and high-pressure steam. The impregnation device 200 is provided with a mixture discharge pipe 230, which is connected to the inlet end of the centrifuge 270.

[0054] Acetylene black and high-pressure steam enter the impregnation device 200, where they are fully mixed, contacted, and collided to form a mixture of acetylene black and high-pressure steam. During the mixing process, the high-pressure steam impregnates the acetylene black.

[0055] In a preferred embodiment, the impregnation device 200 is provided with a mixing chamber 240 at its front end, the mixing chamber 240 being used to mix acetylene black and high-pressure steam, and a conveying chamber 250 is provided at its rear end, the conveying chamber 250 being provided with a screw conveyor 251, the screw conveyor 251 being used to convey a portion of the powdered acetylene black that has settled at the bottom of the impregnation device 200 to the first discharge assembly 280.

[0056] By setting up a mixing chamber 240, acetylene black and high-pressure steam are transported into the mixing chamber 240 through the acetylene black feed pipe 221 and the high-pressure steam inlet pipe 211, so that the acetylene black and high-pressure steam come into contact in the mixing chamber 240 to form a mixture of acetylene black and high-pressure steam. At the same time, the hot gas generated by the high-pressure steam wets the acetylene black. Then, by setting up the conveying chamber 250, part of the powdered acetylene black that has settled at the bottom of the conveying chamber 250 is conveyed to the separation section 260 through the screw conveyor 251, so that all the powdered acetylene black that has been wetted is conveyed to the separation section 260. For example, the contact section is a cylindrical cavity with a mixing chamber 240 at the front end and a screw conveyor 251 at the rear end. After acetylene black and high-pressure steam enter the impregnation section 220 simultaneously, they are thoroughly mixed in the mixing chamber 240 at the front end. After mixing, the high-pressure steam carries the acetylene black forward. During the conveying process, some of the acetylene black settles. The settled acetylene black is conveyed to the separation device through the screw conveyor 251. The remaining acetylene black is suspended in the centrifugal separator 270 with the high-pressure steam and undergoes gas-solid separation through the centrifugal separator 270. The acetylene black produced after separation is conveyed to the granulation device 300 through the first discharge component 280.

[0057] The following specific experimental examples further illustrate the technical features and effects of the present invention. It is worth noting that the following laboratory experiments are all small-scale laboratory tests.

[0058] Comparative Example 1

[0059] Acetylene black and high-pressure steam enter the impregnation section 220 to impregnate the acetylene black. The acetylene black and high-pressure steam are thoroughly mixed within the impregnation section 220. The high-pressure steam impregnates the acetylene black at pressures of 0.5 PMa, 0.7 PMa, 1.5 PMa, 1.8 PMa, and 2.5 PMa. The impregnated acetylene black is then transported to the centrifugal cooling section for gas-solid separation. The separated acetylene black then enters the granulation unit 300 for granulation. The temperature of the granulation water is 80℃. Granulated acetylene black is obtained after granulation. The oil absorption value of the granulated acetylene black product is shown in Table 1.

[0060] Comparative Example 2

[0061] Acetylene black and high-pressure steam enter the impregnation section 220 to impregnate the acetylene black. The acetylene black and high-pressure steam are thoroughly mixed within the impregnation section 220. The high-pressure steam impregnates the acetylene black. The impregnated acetylene black is then conveyed to the centrifugal cooling section. The centrifugal cooling section performs gas-solid separation and cools the impregnated acetylene black to 80℃, 90℃, and 50℃ respectively. The cooled acetylene black then enters the granulation device 300 for granulation. The temperature of the granulation water is 80℃. Granulated acetylene black is obtained after granulation. The oil absorption value of the granulated acetylene black product is shown in Table 1.

[0062] Comparative Example 3

[0063] Acetylene black and high-pressure steam enter the impregnation section 220, where they are thoroughly mixed to preheat the acetylene black to 80°C, 90°C, 110°C, 125°C, and 150°C respectively. The preheated acetylene black is then impregnated with high-pressure steam and transported to the centrifugal cooling section. The centrifugal cooling section performs gas-solid separation and cools the impregnated acetylene black. The cooled acetylene black then enters the granulation device 300 for granulation. The temperature of the granulation water is 80°C. Granulated acetylene black is obtained after granulation. The oil absorption value of the granulated acetylene black product is shown in Table 1.

[0064] Comparative Example 4

[0065] Acetylene black and high-pressure steam enter the impregnation section 220, where they are thoroughly mixed to preheat the acetylene black. The preheated acetylene black is then impregnated by the high-pressure steam and transported to the centrifugal cooling section. The centrifugal cooling section performs gas-solid separation and cools the impregnated acetylene black to 80°C, 90°C, and 0°C, respectively. The cooled acetylene black then enters the granulation device 300 for granulation. The temperature of the granulation water is 80°C. Granulated acetylene black is obtained after granulation. The oil absorption value of the granulated acetylene black product is shown in Table 1.

[0066] Carbon black raw materials with a DBP oil absorption value ≥240ml / L

[0067]

[0068] As can be seen from the table above:

[0069] When the high-pressure steam pressure is between 0.5 PMa and 1.5 PMa, the influence of DBP on oil absorption value is small; when the high-pressure steam pressure is 1.8 PMa, the influence of DBP on oil absorption value is slightly increased; when the high-pressure steam pressure is 2.5 PMa, the influence of DBP on oil absorption value increases.

[0070] When acetylene black is cooled to 80°C, the oil absorption value of DBP does not change. When acetylene black is cooled to 90°C, the effect on the oil absorption value of DBP is small. When acetylene black is cooled to 50°C, the oil absorption value of DBP increases slightly.

[0071] When acetylene black is preheated to 80℃~110℃, the effect of DBP oil absorption value is small; when acetylene black is preheated to 125℃, the effect of DBP oil absorption value is slightly increased; when acetylene black is preheated to 150℃, the effect of DBP oil absorption value is significantly increased.

[0072] When acetylene black is preheated and then cooled to 80°C, the effect of DBP oil absorption value increases slightly; when acetylene black is preheated and then cooled to 90°C, the DBP oil absorption value increases significantly; when acetylene black is preheated and then cooled to 50°C, the highest DBP oil absorption value is achieved.

[0073] The above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the invention. Those skilled in the art will understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A method for granulating acetylene black using high-pressure steam, characterized in that: include a. Preheat acetylene black to 150 °C, then feed it with high-pressure steam at a pressure of 2.5 MPa to mix and impregnate the acetylene black with the high-pressure steam; b. Cool the impregnated acetylene black to 50 °C; c. Granulation medium is introduced into the cooled acetylene black to granulate it, wherein the temperature of the granulation medium is 80 ℃.

2. The high-pressure steam acetylene carbon black granulation method as described in claim 1, characterized in that: The granulation medium is pure water.

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