Carbon black reaction furnace

Abstract

The utility model provides a carbon black reacting furnace which comprises a furnace body and an air inlet device, the furnace body comprises a combustion chamber, the combustion chamber is provided with an end wall perpendicular to the first direction, and air inlet holes are formed in the end wall. The air inlet device is arranged on the end wall of the furnace body and comprises a shell, a guide cylinder, an air inlet and a fuel conveying device; the shell is connected to the furnace body; the guide cylinder is arranged in the inner cavity of the shell, the axial direction of the guide cylinder is a first direction, one end of the guide cylinder is connected to the end wall, a cylinder opening of the end is communicated with the air inlet, the other end of the guide cylinder and the cavity wall of the inner cavity are spaced to form an end gap, and the guide cylinder and the inner circumferential wall of the inner cavity are spaced in the circumferential direction to form an annular gap; the air inlet communicates with the annular gap and is used for inputting process air in the second direction perpendicular to the first direction. The fuel conveying device extends into the shell from the outside, is partially located in the guide cylinder and is used for conveying fuel to the combustion chamber through the air inlet hole.

Description

Technical Field

[0001] This utility model relates to the technical field of carbon black preparation equipment, and in particular to a carbon black reaction furnace. Background Technology

[0002] The carbon black reactor is a core piece of equipment in furnace-process carbon black production. In existing designs, an air distributor is used to input process air into the combustion chamber. Specifically, the process air is injected from above into the air distributor, where it is then directly redirected and enters the combustion chamber. However, this existing design struggles to provide a stable airflow field for the combustion flame, resulting in insufficient pressure stabilization. Furthermore, the current design typically employs a ring-shaped injection method for fuel input, leading to unstable flow fields in the evaporation, cracking, polymerization, and collision reactions after the feedstock oil is injected, resulting in poor stability of the carbon black formation morphology. Utility Model Content

[0003] One of the main objectives of this invention is to overcome at least one of the defects of the prior art and to provide a carbon black reactor capable of providing a stable airflow field for the combustion flame.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] According to one aspect of the present invention, a carbon black reactor is provided, comprising a furnace body and an air inlet device; the furnace body includes a combustion chamber having an end wall perpendicular to a first direction, the end wall having an air inlet hole; the air inlet device is disposed on the end wall of the furnace body for supplying fuel and process air into the combustion chamber, the air inlet device including a shell, a guide tube, an air inlet, and a fuel delivery device; the shell has an inner cavity, one end of the inner cavity having an opening in the first direction, the shell being connected to the furnace body through the opening; the guide tube is disposed in the inner cavity, the axis of the guide tube being the first direction, one end of the guide tube being connected to the end wall and the opening of that end communicating with the air inlet hole, the other end of the guide tube being away from the inner cavity. The end walls of the end wall are spaced apart to form an end gap, and the guide tube is spaced apart from the inner peripheral wall of the inner cavity to form an annular gap in the circumferential direction; the air inlet is connected to the side of the housing and communicates with the annular gap, and the air inlet is used to input process air in a second direction perpendicular to the first direction; the fuel delivery device extends from the outside into the housing and is partially located in the guide tube, and the fuel delivery device is used to deliver fuel to the combustion chamber through the air inlet; wherein, the carbon black reactor is configured such that: after the process air enters the inner cavity through the air inlet in the second direction, it changes to flow in the first direction through the annular gap, the end gap and the guide tube, and then is input into the combustion chamber through the air inlet to participate in the combustion of fuel.

[0006] According to one embodiment of the present invention, the cross-section of the housing is circular, and the air inlet extends radially along the housing so that process air is input into the annular gap radially along the housing.

[0007] According to one embodiment of the present invention, a rectifying structure is provided at the end of the guide tube away from the end wall. The rectifying structure has a central channel and multiple rectifying channels. The central channel extends along the first direction and is connected to the opening of the guide tube at the end away from the end wall. The rectifying channels extend along the first direction and are disposed on the outer periphery of the central channel. The multiple rectifying channels are arranged circumferentially along the central channel to separate the annular gap from the end gap. The annular gap and the end gap are connected via the rectifying channels.

[0008] According to one embodiment of the present invention, the rectification structure includes an inner ring plate, an outer ring plate, and a plurality of support plates. The inner ring plate forms the central channel, and the outer ring plates are spaced apart around the outer periphery of the inner ring plate. The support plates are connected between the inner ring plate and the outer ring plate. The plurality of support plates are arranged circumferentially to divide the annular channel between the inner ring plate and the outer ring plate into a plurality of rectification channels.

[0009] According to one embodiment of the present invention, the end wall is provided with a convergent cylinder, the axial direction of the convergent cylinder is the first direction, the cavity of the convergent cylinder defines the air inlet, one end of the convergent cylinder extends into the combustion chamber, the other end is located in the guide cylinder, and the output end of the fuel delivery device is located in the convergent cylinder.

[0010] According to one embodiment of the present invention, a throttling plate is provided in the cavity of the converging cylinder, the throttling plate has a throttling orifice, the throttling orifice is the air inlet, and the output end of the fuel delivery device is located on the side of the throttling plate away from the combustion chamber.

[0011] According to one embodiment of the present invention, the inner wall of the combustion chamber is provided with a refractory material layer; wherein, the end wall is provided with a bypass air channel, the bypass air channel connecting the combustion chamber and the air inlet; wherein, the carbon black reactor is configured such that: after process air enters the inner cavity through the air inlet along the second direction, a portion of the process air is input into the combustion chamber through the annular gap, the end gap, the guide tube and the air inlet hole, thereby participating in the combustion of fuel, and another portion of the process air is input into the combustion chamber through the bypass air channel along the first direction, thereby achieving the convergence of the combustion flame.

[0012] According to one embodiment of the present invention, the ratio of the cross-sectional area of ​​the air inlet to the cross-sectional area of ​​the bypass air passage is 5:4 to 5:1.

[0013] According to one embodiment of the present invention, the air intake device includes at least two fuel delivery devices, and the at least two fuel delivery devices are evenly distributed.

[0014] According to one embodiment of the present invention, the fuel is natural gas, and the fuel delivery device is a natural gas nozzle.

[0015] As can be seen from the above technical solution, the advantages and positive effects of the carbon black reactor proposed in this utility model are as follows:

[0016] The carbon black reactor proposed in this utility model includes a furnace body and an air inlet device. The furnace body includes a combustion chamber with an end wall perpendicular to a first direction and an air inlet hole. The air inlet device is disposed on the end wall of the furnace body and includes a shell, a guide tube, an air inlet, and a fuel delivery device. The shell is connected to the furnace body. The guide tube is disposed in the inner cavity of the shell, with the axial direction of the guide tube being the first direction. One end of the guide tube is connected to the end wall, and the opening of the guide tube at that end is connected to the air inlet hole. The other end of the guide tube is spaced apart from the cavity wall of the inner cavity to form an end gap. The guide tube is spaced apart from the inner circumferential wall of the inner cavity to form an annular gap. The air inlet is connected to the annular gap and is used to input process air in a second direction perpendicular to the first direction. The fuel delivery device extends from the outside into the shell and is partially located in the guide tube. It is used to deliver fuel to the combustion chamber through the air inlet hole. Through the above structural design, in the process of inputting process air, the process air enters the inner cavity of the shell from the inlet along the second direction, and then flows sequentially through the annular gap and the end gap. Under the combined guiding action of the shell and the guide tube, the flow direction of the process air changes to the first direction, thereby enabling the process air to be input into the combustion chamber through the inlet along the first direction. Therefore, this invention avoids the process air entering along the second direction from directly changing to the first direction and entering the combustion chamber, which is beneficial for providing a more stable airflow field for the combustion flame and improving pressure stabilization. In addition, by extending the fuel delivery device into the guide tube to achieve fuel input along the first direction, this invention can ensure a relatively stable flow field for the evaporation, cracking, polymerization, and collision reactions after fuel injection, thus improving the stability of the carbon black formation pattern. Attached Figure Description

[0017] The various objectives, features, and advantages of this invention will become more apparent from the following detailed description of preferred embodiments in conjunction with the accompanying drawings. The drawings are merely illustrative illustrations of the invention and are not necessarily drawn to scale. In the drawings, the same reference numerals always denote the same or similar parts. Wherein:

[0018] Figure 1 This is a partial axial sectional view of a carbon black reactor according to an exemplary embodiment;

[0019] Figure 2 yes Figure 1 Enlarged schematic diagram of some of the structures in the diagram;

[0020] Figures 3 to 1 An enlarged schematic diagram of part A in the diagram;

[0021] Figure 4 yes Figure 1 A schematic cross-sectional view of the carbon black reactor is shown.

[0022] Figure 5 yes Figure 1 An enlarged schematic diagram of the rectifier structure in the circuit;

[0023] Figure 6 yes Figure 5 A plan view.

[0024] The annotations in the attached figures are explained as follows:

[0025] 100. Furnace body;

[0026] 101. Combustion chamber;

[0027] 110. End wall;

[0028] 111. Air intake;

[0029] 112. Connecting parts;

[0030] 1121. Spacer;

[0031] 113. Bypass air passage;

[0032] 120. Refractory material layer;

[0033] 200. Air intake device;

[0034] 201. End clearance;

[0035] 202. Annular gap;

[0036] 210. Shell;

[0037] 220. Flow deflector;

[0038] 230. Air intake;

[0039] 240. Fuel delivery device;

[0040] 250. Rectifier structure;

[0041] 251. Rectifier channel;

[0042] 252. Central Passage;

[0043] 253. Inner ring plate;

[0044] 254. Outer ring plate;

[0045] 255. Support plate;

[0046] 260. Converging tube;

[0047] 261. Throttling plate;

[0048] 2611. Throttling orifice;

[0049] X. First direction;

[0050] Y. Second direction. Detailed Implementation

[0051] Typical embodiments embodying the features and advantages of this utility model will be described in detail in the following description. It should be understood that this utility model can have various variations in different embodiments, all of which do not depart from the scope of this utility model, and the description and drawings therein are for illustrative purposes only and not intended to limit this utility model.

[0052] In the following description of different exemplary embodiments of the present invention, reference is made to the accompanying drawings, which form part of the present invention, and which illustrate by way of example various exemplary structures, systems, and steps that can implement multiple aspects of the present invention. It should be understood that other specific embodiments of the components, structures, exemplary devices, systems, and steps may be used, and structural and functional modifications may be made without departing from the scope of the present invention. Furthermore, although the terms “above,” “between,” “within,” etc., may be used in this specification to describe different exemplary features and elements of the present invention, these terms are used herein only for convenience, such as the orientation according to the examples shown in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the present invention.

[0053] See Figure 1 The illustration shows a partial axial sectional view of the carbon black reactor proposed in this invention. In this exemplary embodiment, the carbon black reactor proposed in this invention is described using a hard carbon reactor as an example. It will be readily understood by those skilled in the art that various modifications, additions, substitutions, deletions, or other changes may be made to the specific embodiments described below in order to apply the relevant design of this invention to other types of carbon black preparation equipment, and these changes are still within the scope of the principle of the carbon black reactor proposed in this invention.

[0054] like Figure 1 As shown, in one embodiment of this utility model, the carbon black reactor proposed by this utility model includes a furnace body 100 and an air inlet device 200. (See also...) Figures 2 to 6 , Figure 2 China representatively shows Figure 1 The diagram shows an enlarged view of some of the structures, specifically illustrating the enlarged structure of the guide tube 220 and related components; Figure 3 China representatively shows Figure 1 An enlarged schematic diagram of part A in the diagram; Figure 4 A schematic cross-sectional view of a carbon black reactor is shown in the figure. Figure 5 A representative enlarged schematic diagram of the rectifier structure 250 is shown in the figure. Figure 6 China representatively shows Figure 5 The above-mentioned drawings provide a plan view. The structure, connection method, and functional relationship of the main components of the carbon black reactor proposed in this utility model will be described in detail below with reference to the drawings.

[0055] like Figures 1 to 4As shown, in one embodiment of this utility model, the furnace body 100 includes a combustion chamber 101, which has an end wall 110 perpendicular to a first direction X, and the end wall 110 has an air inlet 111. In this embodiment, the end wall 110 can be fixedly connected to the port of the furnace body 100 via a connector 112 (e.g., bolts). In other embodiments, the end wall 110 can also be connected to the port of the furnace body 100 in other ways, or the end wall 110 and the furnace body 100 can be an integral structure. The air inlet device 200 is disposed on the end wall 110 of the furnace body 100, and the air inlet device 200 is used to deliver fuel and process air into the combustion chamber 101. The air inlet device 200 includes a housing 210, a guide tube 220, an air inlet 230, and a fuel delivery device 240. Specifically, the housing 210 has an inner cavity with an opening at one end in the first direction X, and the housing 210 is connected to the furnace body 100 through this opening. The guide tube 220 is disposed within the inner cavity of the housing 210, and the axial direction of the guide tube 220 is the first direction X. One end of the guide tube 220 is connected to the end wall 110, and the opening at that end of the guide tube 220 connected to the end wall 110 communicates with the air inlet 111. The other end of the guide tube 220 is spaced apart from the side wall of the inner cavity away from the end wall 110 to form an end gap 201. The guide tube 220 is also spaced apart from the inner circumferential wall of the inner cavity in the circumferential direction to form an annular gap 202. The end gap 201 and the annular gap 202 communicate with each other to form a channel for the flow of process air into the inner cavity. The air inlet 230 is connected to the side of the housing 210 and communicates with the annular gap 202. The air inlet 230 is used to input process air in the second direction Y, which is perpendicular to the first direction X. The fuel delivery device 240 extends into the housing 210 from the outside and is partially located in the guide tube 220. The fuel delivery device 240 is used to deliver fuel to the combustion chamber 101 through the air inlet 111. Based on this, the carbon black reactor proposed in this utility model is configured such that: after the process air enters the inner cavity through the air inlet 230 in the second direction Y, it is transformed into flowing in the first direction X through the annular gap 202, the end gap 201 (and the side wall of the inner cavity away from the end wall 110 achieves airflow rebound) and the guide tube 220, and then inputs into the combustion chamber 101 through the air inlet 111 to participate in the combustion of fuel. Through the above structural design, in the process of inputting process air, the process air enters the inner cavity of the housing 210 from the air inlet 230 along the second direction Y, and flows through the annular gap 202 and the end gap 201 in sequence. Under the joint guiding action of the housing 210 and the guide tube 220, the flow direction of the process air changes to the first direction X, thereby realizing that the process air is input into the combustion chamber 101 through the air inlet 111 along the first direction X.Accordingly, this invention can prevent process air entering along the second direction Y from directly turning to the first direction X and entering the combustion chamber 101, which is beneficial to provide a more stable air flow field for the combustion flame and improve the pressure stabilization capability. In addition, this invention extends the fuel delivery device 240 into the guide tube 220 to realize fuel input along the first direction X. This invention can ensure that the flow field produced by the evaporation, cracking, polymerization, collision and other reactions after fuel injection is relatively stable, and improve the stability of the carbon black formation mode.

[0056] like Figure 4 As shown, in one embodiment of this invention, the cross-section of the housing 210 can be circular. Based on this, the air inlet 230 can extend radially along the housing 210, or it can be understood that the extension of the central axis of the air inlet 230 intersects the central axis of the housing 210 extending in the first direction X. This allows process air to enter the annular gap 202 radially along the housing 210, while a portion (e.g., less than 30%) of the process air can enter the combustion chamber 101 through the bypass air passage 113 annular gap. Through the above structural design, this invention allows the process air to mix along the circumferential radial movement of the air inlet 230 and the guide tube 220, and then uniformly enter the converging tube 260 along multiple rectifying structures 250, forming a direct current. Accordingly, this invention can divide the process air into two paths, and by changing the ratio of primary air to bypass air, a shorter flame length can be obtained. The natural gas calorific value range designed for this burner is 9000±100 kcal / Nm³. 3 Within this range, air and natural gas are fully mixed, the burner flame is stable, and complete combustion of natural gas is ensured under the set load conditions. In some embodiments, the air inlet 230 may also extend in other directions, such as along the tangent of the circular cross-section of the housing 210, and is not limited to this embodiment.

[0057] like Figure 1 , Figure 2 and Figure 4 As shown, in one embodiment of this utility model, a rectifying structure 250 is provided at the end of the guide tube 220 away from the end wall 110. The rectifying structure 250 has a central channel 252 and multiple rectifying channels 251. The central channel 252 extends along a first direction X and connects to the opening of the guide tube 220 away from the end wall 110. The rectifying channels 251 extend along the first direction X and are disposed on the outer periphery of the central channel 252. The multiple rectifying channels 251 are arranged circumferentially along the central channel 252 to separate the annular gap 202 and the end gap 201. The annular gap 202 and the end gap 201 are connected via the rectifying channels 251. Accordingly, preheated air can pass through the rectifying channels 251.

[0058] like Figure 5and Figure 6 As shown, in one embodiment of this disclosure, the rectifying structure 250 may include an inner ring plate 253, an outer ring plate 254, and multiple support plates 255. The inner ring plate 253 forms a central channel 252, and the outer ring plates 254 are spaced around the outer periphery of the inner ring plate 253. The support plates 255 are connected between the inner ring plate 253 and the outer ring plate 254. The multiple support plates 255 are arranged circumferentially to divide the annular channel between the inner ring plate 253 and the outer ring plate 254 into multiple rectifying channels 251. The support plates 255 may be connected to the inner ring plate 253 and the outer ring plate 254 by, but is not limited to, welding. The flow velocity design reference of the rectifying structure 250 may be greater than 30 m / s. Through the above structural design, this disclosure enables process air to form a straight and stable flow after passing through the rectifying structure 250 and to pass through the gaps in the rectifying structure 250, thereby making the returning process air the mainstream flow into the guide tube 220. In addition, there may be a certain gap (e.g., 5mm to 10mm) between the outer ring plate 254 of the rectifier structure 250 and the refractory material layer of the inner wall of the shell 210, which can further facilitate the installation of the rectifier structure 250.

[0059] like Figure 1 and Figure 2 As shown, based on the structural design of the flow guide 220 and the inner cavity, the flow rectifier 250 can be arranged perpendicular to the first direction X in one embodiment of this utility model. In other words, taking the example that both the flow guide 220 and the shell 210 have circular cross-sections, the flow rectifier 250 can be arranged parallel to the radial direction of the flow guide 220 or the shell 210.

[0060] like Figure 2 and Figure 4 As shown, in one embodiment of this utility model, the end wall 110 may be provided with a converging cylinder 260, the axial direction of which is the first direction X. The cavity of the converging cylinder 260 defines an air inlet 111; in other words, both ends of the converging cylinder 260 in the axial direction (i.e., the first direction X) are open. One end of the converging cylinder 260 extends into the combustion chamber 101, and the other end is located inside the guide cylinder 220. The output end of the fuel delivery device 240 is located inside the converging cylinder 260. Accordingly, the process air flows through the annular gap 202 and the end gap 201, transforming its flow direction to the first direction X, then flows into the guide cylinder 220, then into the converging cylinder 260, and finally into the combustion chamber 101 via the converging cylinder 260. Based on this, since the output end of the fuel delivery device 240 is located inside the convergence cylinder 260, the fuel output from the output end can be converged by the convergence cylinder 260, which is conducive to the convergence of the combustion flame shape. At the same time, it is conducive to the symmetry of the flowing air and the formation of a uniform distribution, thus avoiding combustion flame failure.

[0061] like Figure 2 As shown, based on the structural design of the convergent cylinder 260, in one embodiment of this utility model, a throttling plate 261 can be provided in the cavity of the convergent cylinder 260. The throttling plate 261 has a throttling orifice 2611, which penetrates the throttling plate 261 along the first direction X to allow process air and fuel to pass through. Accordingly, the throttling orifice 2611 is the air inlet 111, or it can be understood that the end of the convergent cylinder 260 facing the combustion chamber 101 is the air inlet 111, and the throttling orifice 2611 is connected to the air inlet 111 through the cavity of the convergent cylinder 260. On this basis, the output end of the fuel delivery device 240 is located on the side of the throttling plate 261 facing away from the combustion chamber 101. Through the above structural design, this disclosure increases the process air velocity by selecting the diameter of the throttling orifice plate 261. At the maximum velocity, the air dynamic head is maximized, and the fuel-natural gas gun feed rate is set. The goal is to ensure rapid contact between the fuel-natural gas and air, complete and uniform combustion, minimal excess oxygen production, uniform cross-sectional concentration, and rapid and uniform carbon black production reaction space, thereby controlling the flow rate of the main air inlet orifice plate. At the front end of the flame holder, the rapidly expanding airflow is stabilized. The diameter of the inlet orifice 111 determines the change in combustion airflow resistance after the fuel gas passes through the throttling plate 261, resulting in some back-mixing of heat, thus ensuring continuous and stable combustion of the fuel gas.

[0062] like Figure 1 and Figure 3As shown, in one embodiment of this invention, the inner wall of the combustion chamber 101 is provided with a refractory material layer 120, such as, but not limited to, refractory bricks. Based on this, the end wall 110 may be provided with a bypass air passage 113, which connects the combustion chamber 101 and the air inlet 230. Based on this, the carbon black reactor proposed in this invention is configured such that: after the process air enters the inner cavity of the shell 210 through the air inlet 230, it is divided into two airflows. One airflow is a portion of the process air entering the combustion chamber 101 through the annular gap 202, the end gap 201, the guide tube 220, and the air inlet 111 to participate in fuel combustion; the other airflow is another portion of the process air entering the combustion chamber 101 along the first direction X through the bypass air passage 113, thereby achieving convergence of the combustion flame. Through the above structural design, this invention can achieve the distribution of process air intake, allowing a portion of the process air to be directly delivered to the combustion chamber 101 without passing through fuel. This portion of process air has a lower temperature compared to the other portion that passes through fuel; that is, it is relatively cold air. This provides protection for the refractory material layer 120 on the inner wall of the combustion chamber 101 and also helps to reduce the intensity of the combustion flame. Accordingly, this invention can adjust the flow rate of the two portions of process air by controlling the ratio of the cross-sectional area of ​​the air intake 111 (specifically, for example, the cross-sectional area of ​​the throttling orifice 2611 in the above embodiment) to the cross-sectional area of ​​the bypass air passage 113, thus providing greater flexibility and meeting more diverse application needs.

[0063] Based on the structural design of the bypass air channel 113, in one embodiment of this utility model, the ratio of the cross-sectional area of ​​the air inlet 111 (e.g., the cross-sectional area of ​​the throttling orifice 2611) to the cross-sectional area of ​​the bypass air channel 113 can be 7:3 to 5:1, for example, 7:3 (i.e., the proportion of process air entering the combustion chamber 101 through the annular gap of the bypass air channel 113 in the total air intake is at most 30%), 2:1, 3:2, 5:4, 5:3, 2:1, 5:2, 4:1, 5:1, etc. Through the above structural design, since the connecting member 112 and the bypass air channel 113 protect the bypass air volume, which can be determined by the selected area, this disclosure can utilize the above-mentioned cross-sectional area ratio design to achieve the effect of protecting the refractory wall temperature of the combustion chamber, thereby extending the service life of the reactor refractory material.

[0064] Based on the above structural design regarding the cross-sectional area ratio of the air inlet 111 and the bypass air channel 113, in one embodiment of this invention, the ratio of the cross-sectional area of ​​the air inlet 111 (e.g., the cross-sectional area of ​​the throttling orifice 2611) to the cross-sectional area of ​​the bypass air channel 113 can be specifically 3:1. In other words, for the process air input through the air inlet 230, 75% of the process air is input and participates in fuel combustion via the annular gap 202, the end gap 201, and the guide tube 220 (and may further pass through the convergence tube 260 and the throttling orifice 2611 of the throttling plate 261), while 25% of the process air directly enters the combustion chamber 101 via the annular gap 202 and the bypass air channel 113. Accordingly, this invention can achieve furnace temperatures exceeding 2000°C, thereby improving the yield of carbon black production to a certain extent.

[0065] like Figure 3 As shown, based on the structural design of the bypass air passage 113, in one embodiment of this invention, the end wall 110 can be fixedly connected to the port of the furnace body 100 via the connector 112. Furthermore, a spacer 1121 can be provided on the connector 112, located at the port between the end wall 110 and the furnace body 100, thereby creating a bypass air passage 113 that connects the inner cavity of the housing 210 (i.e., the annular gap 202) and the combustion chamber 101. For example, when the connector 112 is a bolt pair, a spacer nut can be fitted onto the bolt as the spacer 1121. Through the above structural design, this invention can reduce structural complexity and processing difficulty, and avoid damaging the structural integrity of the end wall 110. In some embodiments, the bypass air passage 113 can also be formed in other ways, such as by directly opening a channel in the end wall 110, and is not limited to this embodiment.

[0066] like Figure 1 and Figure 2 As shown, in one embodiment of this utility model, the air intake device 200 may include at least two fuel delivery devices 240, and these fuel delivery devices 240 are evenly distributed. For example, as Figure 4 As shown, the air intake device 200 may specifically include four fuel delivery devices 240, and the four fuel delivery devices 240 may be distributed in a square shape with four corners. Through the above structural design, this utility model can make the fuel input more uniform, play a stabilizing role in the combustion effect, and help to form a more uniform and stable combustion flame.

[0067] In one embodiment of this invention, the fuel can be natural gas, and the fuel delivery device 240 can be a natural gas nozzle. In other embodiments, the fuel can also be other combustion gases, and is not limited to this embodiment.

[0068] It should be noted that the carbon black reactors shown in the accompanying drawings and described in this specification are merely a few examples among many carbon black reactors capable of employing the principles of this invention. It should be clearly understood that the principles of this invention are by no means limited to any detail or component of the carbon black reactors shown in the accompanying drawings or described in this specification.

[0069] In summary, the carbon black reactor proposed in this utility model includes a furnace body 100 and an air inlet device 200; the furnace body 100 includes a combustion chamber 101, the combustion chamber 101 having an end wall 110 perpendicular to the first direction X, and the end wall 110 having an air inlet hole 111; the air inlet device 200 is disposed on the end wall 110 of the furnace body 100 and includes a shell 210, a guide tube 220, an air inlet 230, and a fuel conveying device 240; the shell 210 is connected to the furnace body 100; the guide tube 220 is disposed in the inner cavity of the shell 210, and the axial direction of the guide tube 220 is the first direction X, guiding... One end of the guide tube 220 is connected to the end wall 110 and the opening of the tube at this end is connected to the air inlet 111. The other end of the guide tube 220 is spaced apart from the cavity wall of the inner cavity to form an end gap 201. The guide tube 220 is spaced apart from the inner circumferential wall of the inner cavity to form an annular gap 202. The air inlet 230 is connected to the annular gap 202 and is used to input process air along the second direction Y perpendicular to the first direction X. The fuel delivery device 240 extends from the outside into the housing 210 and is partially located in the guide tube 220. It is used to deliver fuel to the combustion chamber 101 through the air inlet 111. Through the above structural design, in the process of inputting process air, the process air enters the inner cavity of the housing 210 from the air inlet 230 along the second direction Y, and then flows sequentially through the annular gap 202 and the end gap 201. Under the joint guidance of the housing 210 and the guide tube 220, the flow direction of the process air changes to the first direction X, thereby realizing that the process air is input into the combustion chamber 101 along the first direction X through the air inlet 111. Accordingly, this invention can prevent the process air entering along the second direction Y from directly turning to the first direction X and entering the combustion chamber 101, which is beneficial to providing a more stable airflow field for the combustion flame and improving the pressure stabilization capability. In addition, this invention extends the fuel delivery device 240 into the guide tube 220 to realize fuel input along the first direction X. This invention can ensure that the flow field produced by evaporation, cracking, polymerization, collision and other reactions after fuel injection is relatively stable, and improve the stability of carbon black formation mode.

[0070] Specifically, the carbon black reactor proposed in this utility model can achieve large-scale production of a single unit, and compared with existing equipment, it has the following main technical features:

[0071] 1. The carbon black reactor is a key piece of equipment in the carbon black production plant. The reactor is a new process carbon black reactor for hard carbon black. The matching reactor combustion model is applied to a 40,000-ton-per-year hard carbon black reactor. The fuel can be coal gas or natural gas. The fuel gas guns are arranged axially, and the natural gas does not require carrier atomization. The fuel gas is introduced in the axial direction, and four natural gas guns are arranged according to the combustion chamber space to ensure better contact and uniform mixing with the process air and ensure complete combustion of fuel. With four natural gas guns, the combustion chamber flame is shortened, the combustion gas is more uniform, and the high-temperature combustion gas forms more uniform oxygen at the end of the combustion chamber. This not only stabilizes product quality, but also has a good effect on reducing consumption and saving energy.

[0072] 2. The service life of the distributor and combustion chamber of the existing equipment is about one year. In contrast, the service life of the air intake device and combustion chamber of the carbon black reactor proposed in this utility model can be extended to more than two years.

[0073] 3. The carbon black reactor proposed in this invention can achieve uniform combustion of high-temperature combustion gases in the combustion chamber, with the furnace temperature reaching 1950℃~2050℃. For a given feed oil in the reactor throat section, it can stabilize product quality, improve feed oil yield, and reduce feed oil consumption per unit area. The relationship between the carbon black yield from feed oil and the furnace temperature is as follows:

[0074] a. Yield % = 0.003 * Furnace temperature (°C) + 0.0055

[0075] b. Furnace temperature from 1950-2050℃

[0076] Based on this, it was calculated that the yield could be increased from 58.5% to 61.5%.

[0077] The yield increases by 3%, which is equivalent to a reduction of 83 kg of carbon black consumption per ton. Based on a production facility with an annual output of 40,000 tons, this translates to a saving of 40,000 * 0.083 = 3,320 tons of raw material oil per year. Assuming a price of 4,000 yuan per ton of raw material oil, this would amount to a saving of 13.28 million yuan per year. Therefore, this utility model has good economic benefits.

[0078] The exemplary embodiments of the carbon black reactor proposed by this utility model have been described and / or illustrated in detail above. However, the embodiments of this utility model are not limited to the specific embodiments described herein; rather, components and / or steps of each embodiment may be used independently and separately from other components and / or steps described herein. Each component and / or step of one embodiment may also be used in combination with other components and / or steps of other embodiments. In describing the elements / components / etc. described and / or illustrated herein, the terms "a," "an," and "the above" are used to indicate the presence of one or more elements / components / etc. The terms "comprising," "including," and "having" are used to indicate an open-ended inclusion and mean that additional elements / components / etc. may exist in addition to the listed elements / components / etc. Furthermore, the terms "first" and "second," etc., in the claims and specification are used only as illustrative marks and are not intended to limit the numerical scope of the object.

[0079] Although the carbon black reactor proposed in this invention has been described according to different specific embodiments, those skilled in the art will recognize that modifications can be made to the implementation of this invention within the spirit and scope of the claims.

Claims

1. A carbon black reaction furnace, characterized in that, include: The furnace body includes a combustion chamber, the combustion chamber having an end wall perpendicular to a first direction, and the end wall having an air inlet hole; as well as An air intake device, disposed on the end wall of the furnace body, is used to supply fuel and process air into the combustion chamber. The air intake device includes: A housing having an inner cavity, the inner cavity having an opening at one end in the first direction, the housing being connected to the furnace body through the opening; A flow guide tube is disposed in the inner cavity. The axial direction of the flow guide tube is the first direction. One end of the flow guide tube is connected to the end wall and the opening of the tube at that end is connected to the air inlet. The other end of the flow guide tube is spaced apart from the side wall of the inner cavity away from the end wall to form an end gap. The flow guide tube is spaced apart from the inner peripheral wall of the inner cavity in the circumferential direction to form an annular gap. An air inlet, connected to the side of the housing and communicating with the annular gap, is used to input process air in a second direction perpendicular to the first direction; and A fuel delivery device extends from the outside into the housing and is partially located in the guide tube; the fuel delivery device is used to deliver fuel to the combustion chamber via the air inlet. The carbon black reactor is configured such that process air enters the inner cavity through the air inlet along the second direction, then flows along the first direction through the annular gap, the end gap, and the guide tube, and is then fed into the combustion chamber through the air inlet to participate in the combustion of fuel.

2. The carbon black reactor according to claim 1, characterized in that, The housing has a circular cross-section, and the air inlet extends radially along the housing so that process air is introduced into the annular gap radially along the housing.

3. The carbon black reactor according to claim 1, characterized in that, The guide tube has a rectifying structure at one end away from the end wall. The rectifying structure has a central channel and multiple rectifying channels. The central channel extends along the first direction and is connected to the opening of the guide tube at the end away from the end wall. The rectifying channels extend along the first direction and are disposed on the outer periphery of the central channel. The multiple rectifying channels are arranged circumferentially along the central channel to separate the annular gap from the end gap. The annular gap and the end gap are connected via the rectifying channels.

4. The carbon black reactor according to claim 3, characterized in that, The rectification structure includes an inner ring plate, an outer ring plate, and multiple support plates. The inner ring plate forms the central channel, and the outer ring plates are spaced apart around the outer periphery of the inner ring plate. The support plates are connected between the inner ring plate and the outer ring plate. The multiple support plates are arranged circumferentially to divide the annular channel between the inner ring plate and the outer ring plate into multiple rectification channels.

5. The carbon black reactor according to claim 1, characterized in that, The end wall is provided with a convergent cylinder, the axis of the convergent cylinder is the first direction, the cavity of the convergent cylinder defines the air inlet, one end of the convergent cylinder extends into the combustion chamber, the other end is located in the guide cylinder, and the output end of the fuel delivery device is located in the convergent cylinder.

6. The carbon black reactor according to claim 5, characterized in that, A throttling plate is provided in the cavity of the converging cylinder, and the throttling plate has a throttling orifice, which is the air inlet. The output end of the fuel delivery device is located on the side of the throttling plate that faces away from the combustion chamber.

7. The carbon black reactor according to any one of claims 1 to 6, characterized in that, The inner wall of the combustion chamber is provided with a refractory material layer; wherein, the end wall is provided with a bypass air channel, the bypass air channel connecting the combustion chamber and the air inlet; wherein, the carbon black reactor is configured such that: after process air enters the inner cavity through the air inlet along the second direction, a portion of the process air is input into the combustion chamber through the annular gap, the end gap, the guide tube and the air inlet hole, thereby participating in the combustion of fuel, and another portion of the process air is input into the combustion chamber through the bypass air channel along the first direction, thereby achieving the convergence of the combustion flame.

8. The carbon black reactor according to claim 7, characterized in that, The ratio of the cross-sectional area of ​​the air intake to the cross-sectional area of ​​the bypass air passage is 5:4 to 5:

1.

9. The carbon black reactor according to any one of claims 1 to 6, characterized in that, The air intake device includes at least two fuel delivery devices, which are evenly distributed.

10. The carbon black reactor according to any one of claims 1 to 6, characterized in that, The fuel is natural gas, and the fuel delivery device is a natural gas nozzle.

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