Fuel gas mixer of carbon black reacting furnace

Abstract

The invention relates to a carbon black reaction furnace gas mixer, which comprises a fuel feeding pipe, a fuel mixing chamber and a fuel discharging pipe, the fuel feeding pipe comprises a first feeding pipe and a second feeding pipe which are longitudinally arranged at the front end of the fuel mixing chamber in parallel, and the first feeding pipe and the second feeding pipe are both communicated with the fuel mixing chamber; a plurality of groups of mixing assemblies are transversely arranged in the fuel mixing chamber at intervals, and the fuel mixing chamber is divided into a plurality of mixing cavities; each group of mixing components comprises two material passing plates which are transversely arranged in parallel, a plurality of material passing holes are uniformly distributed in the two material passing plates, and in the same group of mixing components, the material passing holes in the two material passing plates are arranged in a staggered manner; the fuel discharging pipe comprises a first discharging pipe, a second discharging pipe and a mixed discharging pipe, the front end of the first discharging pipe and the front end of the second discharging pipe are communicated with the rear end of the fuel mixing chamber, and the rear end of the first discharging pipe and the rear end of the second discharging pipe are communicated with the mixed discharging pipe at the same time. According to the fuel gas mixer, two kinds of fuel gas can be fully mixed before entering the combustion chamber of the carbon black reaction furnace.

Description

Technical Field

[0001] This invention belongs to the technical field of carbon black production equipment, specifically relating to a gas mixing device for a carbon black reactor, particularly a gas mixer for a carbon black reactor suitable for co-combustion scenarios of multiple fuels. Background Technology

[0002] Carbon black production is an energy-intensive process, and the operating status of its core equipment, the reactor, directly determines the quality, yield, and production cost of the final product. In the carbon black reactor, stable and complete combustion of fuel is a prerequisite for generating clean, high-temperature flue gas, which provides the necessary energy and reaction environment for the cracking of feedstock oil and the formation of carbon black.

[0003] Due to the resource characteristics of our geographical location, our company faces the objective condition of a shortage of a single fuel supply. Our production process requires the simultaneous use of two fuels with different physical or chemical properties (e.g., natural gas and process tail gas, or coal gas with different calorific values). However, conventional combustion systems in existing technologies are typically designed for a single, stable fuel (the fuel delivery process is as follows...). Figure 1 As shown in the figure, it is difficult to achieve efficient and uniform mixing of the two fuels. Insufficient mixing of the two fuels leads to a series of serious technical challenges: 1. Low combustion efficiency: The fuel cannot fully contact the combustion air in the reactor, resulting in incomplete combustion. This not only reduces fuel utilization efficiency and increases fuel consumption, but may also cause unburned components to form localized low-temperature zones in the furnace, disrupting the high-temperature environment required for the reaction.

[0004] 2. Uneven reaction temperature field: Uneven combustion produces an unstable and uneven temperature field. The flame shape is divergent, and the high-temperature zone shifts, making precise control difficult. The direct consequence is that the feedstock oil encounters large temperature fluctuations when injected into the reactor, resulting in incomplete pyrolysis reaction and ultimately leading to a decrease in carbon black product yield and unstable quality (such as structure, particle size distribution, and color strength).

[0005] 3. High raw material consumption: Due to low reaction efficiency, some raw material oils are not effectively converted into carbon black products or are wasted as by-products, resulting in high raw material oil consumption per unit.

[0006] 4. Damaged equipment lifespan: Unstable combustion and drifting high temperatures will cause severe and uneven thermal shock and chemical erosion to the refractory lining of the reactor, especially critical parts such as the throat, accelerating the erosion and damage of the furnace material, shortening the service life of the reactor, and increasing equipment maintenance costs.

[0007] 5. Capacity bottleneck: The combined effect of all the above factors has created a technical bottleneck: in order to maintain basic product quality, it is often necessary to sacrifice reaction intensity, thereby limiting the further increase in the capacity of carbon black plants.

[0008] In conclusion, developing a specialized device that can effectively adapt to the characteristics of two fuels and achieve rapid and uniform mixing is the key to breaking through the current bottlenecks restricting our company's carbon black production in terms of quality, cost, output, and equipment maintenance. Summary of the Invention

[0009] The purpose of this invention is to overcome the shortcomings of existing technologies and address the problems of uneven mixing and incomplete combustion when using two fuels in carbon black production. This invention provides a novel gas mixer with a reasonable structure and high mixing efficiency. By optimizing fuel mixing and improving combustion quality, this invention aims to stabilize the reaction process, thereby achieving the comprehensive goals of improving carbon black product quality and yield, reducing raw material and fuel consumption, increasing equipment capacity, and extending reactor lifespan.

[0010] To achieve the above objectives, the core concept of this invention lies in: structural innovation of the gas mixer, through the design of a unique flow field guidance and mixing mechanism, to force the two fuel gases to undergo full and effective turbulent mixing before entering the combustion chamber of the reactor.

[0011] The specific technical solution of the present invention is as follows: A carbon black reactor gas mixer includes a fuel feed pipe, a fuel mixing chamber, and a fuel discharge pipe. The fuel feed pipe includes a feed pipe one and a feed pipe two arranged longitudinally in parallel at the front end of the fuel mixing chamber. Both feed pipe one and feed pipe two are connected to the fuel mixing chamber. The fuel mixing chamber is laterally spaced with multiple sets of mixing components, dividing the fuel mixing chamber into multiple mixing chambers; each set of mixing components includes two horizontally parallel feed plates, with multiple feed holes evenly distributed on the two feed plates, and the feed holes on the two feed plates in the same set of mixing components are staggered. The fuel discharge pipe includes discharge pipe one, discharge pipe two and mixing discharge pipe. The front ends of discharge pipe one and discharge pipe two are respectively connected to the rear end of the fuel mixing chamber, and the rear ends of discharge pipe one and discharge pipe two are simultaneously connected to the mixing discharge pipe. The mixing discharge pipe is connected to the reactor and is used to send the mixed fuel into the reactor.

[0012] Furthermore, the fuel feed pipe is provided with a grid-shaped partition plate inside, the partition plate is inclined at 3°~5°, and the front end of the partition plate is close to the axis of the fuel feed pipe, while the rear end of the partition plate is far away from the axis of the fuel feed pipe.

[0013] Furthermore, the fuel mixing chamber is provided with at least three sets of mixing components.

[0014] Furthermore, in different groups of mixing components, the feed holes on adjacent feed plates are also staggered.

[0015] Furthermore, in the same set of mixing components, the diameter of the feed holes on the two feed plates is the same or decreases by 1~3cm in sequence from front to back.

[0016] Furthermore, in different groups of mixing components, the diameter of the feed holes on adjacent feed plates decreases by 1 to 3 cm sequentially from front to back.

[0017] Furthermore, a gap is left between the two feed plates in each mixing component, with a spacing of 5 to 25 cm.

[0018] Furthermore, the spacing between the two feed plates in the first mixing assembly is 20cm, and the spacing between the two feed plates in the subsequent mixing assemblies decreases by 5cm each time, while the spacing between the two feed plates is always greater than 5cm.

[0019] Furthermore, the discharge pipe one, discharge pipe two and mixing discharge pipe are arranged in an inverted Y shape, the discharge pipe one and discharge pipe two are inclined at an angle of 3°~6°, and the mixing discharge pipe is arranged horizontally.

[0020] The beneficial effects of this invention are: This carbon black reactor gas mixer divides the fuel mixing chamber into multiple mixing chambers by setting up three sets of mixing components. The diameter of the feed holes on the front mixing component is larger than that on the rear mixing component, which allows the fuel mixing process to be progressively advanced, forming a mechanism of mixing → dispersion → mixing → enhanced dispersion → re-mixing. Furthermore, the smaller diameter of the rear holes, with the same cross-sectional area, results in a greater number of holes, leading to higher fuel dispersion and improved mixing uniformity. The staggered arrangement of the feed holes creates turbulence in the fuel mixing chamber, forming a unique flow field that allows for thorough and effective turbulent mixing of the two fuel gases before they enter the reactor combustion chamber. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the fuel transportation process for carbon black production in the existing technology before the modification.

[0022] Figure 2 This is a schematic diagram of the structure of the gas mixer in the carbon black reactor in an embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the fuel feed pipe in an embodiment of the present invention.

[0024] The attached figures are labeled as follows: Fuel feed pipe 1, feed pipe one 101, feed pipe two 102, partition plate 103; Fuel mixing chamber 2, feed plate 201, feed hole 202, feed mixing chamber 203, primary mixing chamber 204, intermediate mixing chamber 205, discharge mixing chamber 206, fixed flange 207; Fuel discharge pipe 3, discharge pipe one 301, discharge pipe two 302, and mixing discharge pipe 303. Detailed Implementation

[0025] To better understand the above-described objects, features, and advantages of the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Many specific details are set forth in the following description to provide a thorough understanding of the invention; however, the invention may be practiced in other ways different from those described herein, and therefore, the invention is not limited to the specific embodiments disclosed below.

[0026] like Figures 2-3 The carbon black reactor gas mixer shown includes a fuel feed pipe 1, a fuel mixing chamber 2, and a fuel discharge pipe 3. The fuel feed pipe 1 includes a feed pipe 101 and a feed pipe 102 arranged longitudinally in parallel at the front end of the fuel mixing chamber 2. Both feed pipe 101 and feed pipe 102 are connected to the fuel mixing chamber 2. Feed pipe 101 and feed pipe 102 are used to transport two different fuels with different physical or chemical properties (e.g., natural gas and process tail gas, or coal gas with different calorific values).

[0027] Since the diameter of the fuel feed pipe 1 is much smaller than the diameter of the fuel mixing chamber 2, in this embodiment, the fuel feed pipe 1 (including feed pipe one 101 and feed pipe two 102) is provided with a grid-shaped partition plate 103. The partition plate 103 is inclined at 3° relative to the axis line, and the front end of the partition plate 103 is close to the axis line of the fuel feed pipe 1, while the rear end of the partition plate 103 is far away from the axis line of the fuel feed pipe 1, forming an outwardly expanding shape design, so that the fuel can enter the fuel mixing chamber 2 in a dispersed manner, which facilitates better mixing of the two fuels.

[0028] The fuel mixing chamber 2 is horizontally spaced with three sets of mixing components, which divide the fuel mixing chamber 2 into multiple mixing chambers. Specifically, from front to back, they are a feeding mixing chamber 203, a primary mixing chamber 204, an intermediate mixing chamber 205, and a discharging mixing chamber 206. The length ratio of the feeding mixing chamber 203, primary mixing chamber 204, intermediate mixing chamber 205, and discharging mixing chamber 206 is 1:2:2:1 or 1:3:2:1. Dividing the fuel mixing chamber 2 into multiple mixing chambers in this ratio helps improve fuel mixing efficiency and mixing uniformity. In other preferred embodiments, the length ratio of the feeding mixing chamber 203, primary mixing chamber 204, intermediate mixing chamber 205, and discharging mixing chamber 206 can also be set to 3:3:2:1 or 3:2:3:1. The increased length of the front mixing chamber and the shortened length of the rear mixing chamber helps increase the pressure difference between the front and rear ends, allowing the fuel mixing process to progress step by step, and also helps improve fuel mixing efficiency. The fuel mixing chamber 2 is provided with a fixing flange 207 at its front end and rear end, and the fixing flange 207 is used to fix the gas mixer to the front end of the reactor.

[0029] Each mixing assembly includes two horizontally arranged, spaced-apart feed plates 201. Multiple feed holes 202 are evenly distributed in a circular matrix on each feed plate 201. Within the same mixing assembly, the feed holes 202 on the two feed plates 201 are staggered. In different mixing assemblies, the feed holes 202 on adjacent feed plates 201 are also staggered. In this embodiment, the feed holes 202 on adjacent feed plates 201 are staggered by half a diameter (half a diameter equal to the radius of the feed hole 202). In other preferred embodiments, the feed holes 202 on adjacent feed plates 201 can also be staggered by a full diameter. This staggered arrangement of the feed holes 202 allows the fuel to form turbulence in the fuel mixing chamber 2, resulting in more uniform mixing.

[0030] In this embodiment, in the same group of mixing components, the apertures (i.e., the diameters of the feed holes 202) on the two feed plates 201 are the same; and, in order from front to back, the aperture of the feed holes 202 in the second group of mixing components is smaller than that in the first group of mixing components, and the aperture of the feed holes 202 in the third group of mixing components is smaller than that in the second group of mixing components, with the aperture decreasing by 2 cm in each order. By setting three groups of mixing components to divide the fuel mixing chamber 2 into multiple mixing chambers, and with the aperture of the front feed hole 202 being larger than that of the rear feed hole 202, the fuel mixing process can be progressively advanced, forming a mechanism of mixing → enhanced dispersion → re-mixing; and with the smaller aperture at the rear end, the number of holes is also greater for the same cross-sectional area, which can result in higher fuel dispersion and improved mixing uniformity.

[0031] In other preferred embodiments, the diameter of the feed holes 202 on the two feed plates 201 can be set to decrease by 1 cm sequentially from front to back; at the same time, in different groups of mixing components, the diameter of the feed holes 202 on adjacent feed plates 201 decreases by 1 cm sequentially from front to back, and the diameter of the feed holes 202 is greater than 3 cm.

[0032] In this embodiment, a gap is maintained between the two feed plates 201 in each mixing assembly. Specifically, the gap between the two feed plates 201 in the first mixing assembly is 20cm, and the gap between the two feed plates 201 in subsequent mixing assemblies decreases by 5cm each time, while the gap between the two feed plates 201 must always remain greater than 5cm. This creates a small mixing cavity between the two feed plates 201, enhancing the mixing effect.

[0033] The fuel discharge pipe 3 includes a first discharge pipe 301, a second discharge pipe 302, and a mixing discharge pipe 303. The first discharge pipe 301, the second discharge pipe 302, and the mixing discharge pipe 303 are arranged in an inverted Y-shape. The first discharge pipe 301 and the second discharge pipe 302 are inclined at an angle of 3° to 6°, while the mixing discharge pipe 303 is horizontal. The front ends of the first discharge pipe 301 and the second discharge pipe 302 are respectively connected to the rear ends of the fuel mixing chamber 2, and the rear ends of the first discharge pipe 301 and the second discharge pipe 302 are simultaneously connected to the mixing discharge pipe 303. The fuel discharge pipe 3 can further disperse and mix the fuel mixture gas after it has been mixed in the fuel mixing chamber 2, thereby improving the uniformity of fuel mixing. The mixing discharge pipe 303 is connected to the reactor and is used to send the mixed fuel into the reactor.

[0034] During carbon black production, two different fuels are fed into the fuel mixing chamber 2 through feed pipe 101 and feed pipe 202 respectively. After entering the fuel mixing chamber 2, they are uniformly mixed with the feed plate 201 through multiple mixing chambers. Then, they are dispersed again through discharge pipe 1 301 and discharge pipe 2 302. Finally, they are mixed again in the mixing discharge pipe 303 and then fed into the reactor to complete the mixing process of different fuels.

[0035] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A gas mixer for a carbon black reactor, characterized in that, It includes a fuel inlet pipe, a fuel mixing chamber, and a fuel outlet pipe. The fuel inlet pipe includes two inlet pipes, namely inlet pipe one and inlet pipe two, which are arranged longitudinally side by side at the front end of the fuel mixing chamber. Both inlet pipe one and inlet pipe two are connected to the fuel mixing chamber. The fuel mixing chamber is laterally spaced with multiple sets of mixing components, dividing the fuel mixing chamber into multiple mixing chambers; each set of mixing components includes two horizontally parallel feed plates, with multiple feed holes evenly distributed on the two feed plates, and the feed holes on the two feed plates in the same set of mixing components are staggered. The fuel discharge pipe includes discharge pipe one, discharge pipe two and mixing discharge pipe. The front ends of discharge pipe one and discharge pipe two are respectively connected to the rear end of the fuel mixing chamber, and the rear ends of discharge pipe one and discharge pipe two are simultaneously connected to the mixing discharge pipe. The mixing discharge pipe is connected to the reactor and is used to send the mixed fuel into the reactor.

2. The carbon black reactor gas mixer according to claim 1, characterized in that, The fuel feed pipe is equipped with a grid-shaped partition plate. The partition plate is inclined at 3° to 5°, with the front end of the partition plate close to the axis of the fuel feed pipe and the rear end of the partition plate away from the axis of the fuel feed pipe.

3. The carbon black reactor gas mixer according to claim 1, characterized in that, The fuel mixing chamber is equipped with at least three sets of mixing components.

4. The carbon black reactor gas mixer according to claim 3, characterized in that, In different groups of mixed components, the feed holes on adjacent feed plates are also staggered.

5. The carbon black reactor gas mixer according to claim 3, characterized in that, In the same set of mixing components, the diameter of the feed holes on the two feed plates is the same or decreases by 1~3cm in sequence from front to back.

6. The carbon black reactor gas mixer according to claim 5, characterized in that, In different groups of mixing components, the diameter of the feed holes on adjacent feed plates decreases by 1 to 3 cm from front to back.

7. The carbon black reactor gas mixer according to claim 6, characterized in that, There is a gap between the two feed plates in each mixing unit, with a spacing of 5~25cm.

8. The carbon black reactor gas mixer according to claim 7, characterized in that, The spacing between the two feed plates in the first mixing assembly is 20cm. In subsequent mixing assemblies, the spacing between the two feed plates decreases by 5cm each time, and the spacing between the two feed plates is always greater than 5cm.

9. The carbon black reactor gas mixer according to claim 1, characterized in that, The discharge pipe 1, discharge pipe 2 and mixing discharge pipe are arranged in an inverted Y shape. The discharge pipe 1 and discharge pipe 2 are inclined at an angle of 3° to 6°, while the mixing discharge pipe is arranged horizontally.

Images