Carbon black tail gas energy recovery device

Abstract

This application relates to the field of carbon black tail gas treatment technology, and more particularly to a carbon black tail gas energy recovery device, comprising a surface heat exchanger, a spray heat exchanger, and a tail gas pretreatment device connected sequentially along the tail gas flow direction, as well as a reaction tank connected to the surface heat exchanger and a steam turbine unit and a water tank for recovering and utilizing the reaction heat in the reaction tank. This invention achieves cascaded treatment and heat energy recovery of tail gas through a combined process of setting up a surface heat exchanger, a spray heat exchanger, and a tail gas pretreatment device. The surface heat exchanger adopts a counter-current arrangement, utilizing high-temperature tail gas to preheat the purified tail gas, thus improving energy utilization efficiency. Chemical loop combustion technology is employed, using an oxygen carrier circulating between the first and second reaction tanks to avoid direct contact between air and fuel, suppressing the generation of nitrogen oxides at the source. Simultaneously, high-pressure steam is generated through exothermic reaction, improving the conversion rate of thermal energy.

Description

Technical Field

[0001] This application relates to the field of carbon black tail gas treatment technology, and in particular to a carbon black tail gas energy recovery device. Background Technology

[0002] Carbon black, as an important industrial raw material, has a wide range of applications in many fields, especially in rubber, plastics, inks, coatings, and batteries, where it plays an irreplaceable role. In the rubber industry, it can significantly improve the strength, abrasion resistance, and tear resistance of rubber products, making it a core reinforcing agent for products such as tires and conveyor belts. In the plastics industry, carbon black can be used as a highly efficient black pigment to give products a deep color, and it can also improve the weather resistance and UV resistance of products, making it widely used in the plastic pipe and film industries. In inks, it can provide high blackness and good flowability to the ink itself; in coatings, it can enhance the hiding power and durability of the finished product; and in batteries, it can optimize the conductivity of the electrodes.

[0003] However, existing technologies for treating carbon black tail gas generated during carbon black production still have some technical shortcomings. Most existing treatment methods rely on direct combustion to recover the heat energy from the carbon black tail gas. This method has two major problems: First, under high-temperature combustion conditions, nitrogen and oxygen in the air easily react to form nitrogen oxides. At the same time, the direct emission of pollutants such as sulfides and carbon black particles in the tail gas will cause serious air pollution. Installing purification equipment is not only costly but also involves complex operating procedures. Second, direct combustion is a one-step reaction. The direct contact between fuel and air can easily cause high-temperature backfire and heat loss, resulting in low heat energy conversion efficiency. The chemical substances in the tail gas cannot be fully utilized, leading to a low heat energy conversion rate.

[0004] Therefore, how to avoid environmental pollution caused by direct combustion and improve the thermal energy conversion rate has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] This application provides a carbon black tail gas energy recovery device to solve the problems of environmental pollution and low thermal energy conversion rate caused by direct combustion in existing carbon black tail gas treatment devices.

[0006] This application provides a carbon black exhaust gas energy recovery device, comprising: The surface heat exchanger is connected to the carbon black production line. It is used to introduce the carbon black tail gas to be treated, recover the high-temperature heat of the carbon black tail gas to be treated, and heat and dry the pretreated carbon black tail gas. A spray heat exchanger, connected to the surface heat exchanger, is used to perform secondary cooling and dehydration on the carbon black tail gas to be treated after the initial cooling by the surface heat exchanger. The exhaust gas pretreatment device is connected at one end to the spray heat exchanger and at the other end to the surface heat exchanger. It is used to pretreat the carbon black exhaust gas to be treated, remove sulfides from the exhaust gas, and return the pretreated carbon black exhaust gas to the surface heat exchanger. The reaction vessel is connected at one end to the surface heat exchanger and contains an oxygen carrier. The oxygen carrier is used to perform segmented oxidation and reduction reactions on the pretreated carbon black tail gas. The reaction vessel includes a first reaction vessel and a second reaction vessel. The first reaction vessel and the second reaction vessel are connected by a conveying unit to realize the circulation of the oxygen carrier.

[0007] Preferably, the bottom of the first reaction vessel is provided with an air inlet for introducing air to cause the reduced oxygen carrier to undergo an oxidation reaction and release heat, and the bottom of the second reaction vessel is provided with a tail gas inlet for introducing tail gas from the tail gas pretreatment device to cause the oxidized oxygen carrier to undergo a reduction reaction and reform into a reduced oxygen carrier.

[0008] Preferably, the conveying unit includes a first conveying unit and a second conveying unit, wherein: The two ends of the first conveying unit are respectively connected to the first reaction vessel and the second reaction vessel, and are used to convey the oxidized oxygen carrier from the first reaction vessel to the second reaction vessel; The two ends of the second conveying unit are respectively connected to the first reaction vessel and the second reaction vessel, and are used to convey the reduced oxygen carrier from the second reaction vessel back to the first reaction vessel.

[0009] Preferably, the first reaction vessel is fitted with a first heat exchange unit on its outer periphery and a first air distribution component is provided on the inner side of its bottom. Demineralized water is introduced into the first heat exchange unit to absorb the heat released by the oxidation reaction in the first reaction vessel. The first air distribution component is used to distribute air to form a swirling flow to promote the oxidation reaction of the oxygen carrier in the first reaction vessel.

[0010] Preferably, the first air distribution assembly includes a first distribution plate and a second distribution plate arranged in parallel, with the first distribution plate located above the second distribution plate; The first distribution plate includes a first cylinder and a first air pipe evenly distributed on the outer periphery of the first cylinder, and the angle between the line connecting the end of the first air pipe to the center of the first cylinder and its surface is 30-45°. The second distribution plate includes a second cylinder and second air pipes evenly distributed around the outer periphery of the second cylinder, and the angle between the line connecting the end of the second air pipe to the center of the second cylinder and its surface is 10-20°.

[0011] Preferably, the second reaction vessel is provided with a second air distribution component and a turbulence component from bottom to top inside, wherein the second air distribution component has the same structure as the first air distribution component and is used to distribute the incoming exhaust gas to form a swirling flow.

[0012] Preferably, the turbulence-inducing component includes a rotating shaft and a first fan, a spiral blade, and a second fan arranged sequentially along the axis of the rotating shaft. The rotating shaft is rotatably mounted on the inner wall of the second reaction vessel via a mounting bracket, and the first fan and the second fan rotate in opposite directions to increase the turbulence effect in the vertical direction.

[0013] Preferably, the first reaction vessel is a hollow cylindrical tank structure, and a flow guiding component is provided inside it. The flow guiding component is located above the first air distribution component. The flow guiding component includes a first flow guiding plate with a V-shaped structure and a plurality of parallel second flow guiding plates located inside the V-shaped structure. The first flow guiding plate and the second flow guiding plate together form a serpentine airflow channel, which is used to extend the mixing path of air and oxygen carrier and enhance turbulence. Both the first guide plate and the second guide plate are corrugated plates.

[0014] Preferably, the first reaction vessel is a hollow conical vessel structure, comprising: A conical inner wall and a conical outer wall, and a conical receiving cavity formed by the conical inner wall and the conical outer wall, wherein the conical inner wall and the conical outer wall are both wavy, and the conical outer wall is fitted around the outer periphery of the conical inner wall; A second heat exchange unit is also closely attached to the inner side of the conical inner wall.

[0015] Preferably, the device further includes a steam turbine unit and a water tank. The steam turbine unit is connected to the steam outlet of the heat exchange unit located at the reaction tank. The water inlet of the water tank is connected to the condensate outlet of the steam turbine unit, and its outlet is connected to the water inlet of the heat exchange unit of the reaction tank through a feed water pump, forming a water-steam circulation loop.

[0016] The beneficial effects of this application are as follows: The carbon black tail gas energy recovery device of this application achieves cascade treatment and heat recovery of tail gas through a combination of surface heat exchangers, spray heat exchangers and tail gas pretreatment devices. The surface heat exchangers are arranged in a counter-current manner to preheat the purified tail gas with high-temperature tail gas, thereby improving energy utilization. The chemical loop combustion technology is adopted, which avoids direct contact between air and fuel by circulating oxygen carrier between the first and second reaction tanks, thereby inhibiting the generation of nitrogen oxides from the source. At the same time, high-pressure steam is generated through the exothermic reaction, which improves the conversion rate of heat energy. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the overall structure of the carbon black tail gas energy recovery device provided in the embodiments of this application; Figure 2 This is a schematic diagram of the overall structure of the reaction vessel in this application; Figure 3 This is a schematic diagram of another specific embodiment of the first reaction vessel in this application; Figure 4 This is a schematic diagram of a specific embodiment of the turbulence component in this application; Figure 5 This is a schematic diagram of a specific embodiment of the first air distribution component in this application; Figure 6 This is a schematic diagram of the structure of a specific embodiment of the first distribution disk in this application; Figure 7 This is a schematic diagram of a specific embodiment of the second distribution disk in this application.

[0019] Figure label: 1. Surface heat exchanger; 2. Reaction vessel; 21. First reaction vessel; 211. Air inlet; 212. Flow guide assembly; 2121. First guide plate; 2122. First guide plate; 213. Conical inner wall; 214. Conical outer wall; 215. First air distribution assembly; 2151. First distribution plate; 2152. Second distribution plate; 216. Second air distribution assembly; 22. Second reaction vessel; 221. Exhaust gas inlet; 223. Turbulence assembly; 2231. Mounting bracket; 2232. First fan; 2233. Spiral blade; 2234. Second fan; 23. First conveying unit; 24. Second conveying unit; 25. First heat exchange unit; 26. Oxygen carrier; 27. Second heat exchange unit; 3. Exhaust gas pretreatment device; 4. Spray heat exchanger; 5. Steam turbine unit; 6. Water tank. Detailed Implementation

[0020] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] The following is combined Figure 1-7 This describes the carbon black tail gas energy recovery device provided in the embodiments of this application.

[0022] Reference Figure 1 and Figure 2 As shown in the embodiment of this application, the carbon black tail gas energy recovery device mainly includes a surface heat exchanger 1, a spray heat exchanger 4, a tail gas pretreatment device 3 connected sequentially along the tail gas flow direction, a reaction tank 2 connected to the surface heat exchanger 1, and a steam turbine unit 5 and a water tank 6 for recovering and utilizing the reaction heat in the reaction tank 2.

[0023] The surface heat exchanger 1 is connected to the carbon black production line and is used to introduce the carbon black tail gas to be treated. The surface heat exchanger 1 adopts a counter-current heat exchange method. Its cold source is the low-temperature tail gas purified by the tail gas pretreatment device 3, and its heat source is the original high-temperature tail gas from the carbon black production line. The input end of the tail gas pretreatment device 3 is connected to the output end of the spray heat exchanger 4 and is used to pretreat the carbon black tail gas to be treated after secondary cooling and dehydration to remove sulfides from the tail gas. The output end of the tail gas pretreatment device 3 is connected to the heat source inlet end of the surface heat exchanger 1 and the pretreated clean low-temperature tail gas is returned to the surface heat exchanger 1. The residual heat of the original high-temperature tail gas is used to heat and dry it, thereby increasing the tail gas temperature entering the subsequent reaction system and improving its thermal energy utilization rate.

[0024] Specifically, the input end of the reaction vessel 2 is connected to the heat source outlet end of the surface heat exchanger 1 to receive the pretreated tail gas after heating and drying. An oxygen carrier 26 is installed inside the reaction vessel 2, through which the pretreated carbon black tail gas undergoes segmented oxidation and reduction reactions. The raw high-temperature tail gas, which is the carbon black tail gas to be treated, is introduced into the surface heat exchanger 1 through the heat source inlet, and the carbon black tail gas purified by the tail gas pretreatment device 3 is also introduced into the surface heat exchanger 1 through the heat source inlet. The high-temperature heat of the carbon black tail gas to be treated is recovered and utilized in the surface heat exchanger 1 to reduce the temperature of the untreated original high-temperature tail gas and perform initial cooling of the carbon black tail gas to be treated. At the same time, the pretreated carbon black tail gas is heated and dried to preheat the carbon black tail gas to be treated in the reaction tank 2 to promote its reaction. The input end of the spray heat exchanger 4 is connected to the heat source output end of the surface heat exchanger 1 and is used to perform secondary cooling and dehydration of the carbon black tail gas to be treated after the initial cooling in the surface heat exchanger 1. Specifically, the reaction vessel 2 includes a first reaction vessel 21 and a second reaction vessel 22, which are connected by a conveying unit to realize the circulation of oxygen carrier 26. The bottom of the first reaction vessel 21 is provided with an air inlet 211, which is designed with a beveled cut. The angle between the air entry direction and the vertical direction is 30-60°, so that the incoming air can form a rotating upward airflow at the bottom of the first reaction vessel 21, which helps the initial fluidization and uniform distribution of oxygen carrier 26 particles. After the air enters the first reaction vessel 21, it undergoes a fluidized oxidation reaction with the reduced oxygen carrier in the vessel, releasing a large amount of heat.

[0025] In some specific embodiments, the bottom of the second reaction vessel 22 is provided with a tail gas inlet 221 for introducing tail gas from the surface heat exchanger 1. The oxidized oxygen carrier undergoes a reduction reaction with the carbon black tail gas here to reform the reduced oxygen carrier, while removing harmful substances such as hydrocarbons and carbon monoxide from the tail gas. The top of the second reaction vessel 22 is also provided with an exhaust port for discharging the tail gas after the reaction is completed. A barrier net is also provided at the exhaust port to intercept the oxygen carrier 26 entering the second reaction vessel 22 and prevent it from escaping with the tail gas from the exhaust port.

[0026] Compared to traditional direct combustion methods for recovering heat energy, nitrogen and oxygen in the air readily react to form nitrogen oxides at high temperatures. This application employs chemical looping combustion, using an oxygen carrier to transfer oxygen atoms, resulting in a relatively low reaction temperature and a controllable combustion process, which significantly suppresses the formation of thermal nitrogen oxides. Furthermore, the reaction pathways of nitrogen-containing compounds in the exhaust gas under chemical looping combustion differ from those of conventional combustion, further reducing nitrogen oxide production. This helps to reduce atmospheric pollution and mitigate the risk of environmental problems such as acid rain and photochemical smog.

[0027] By employing chemical looping combustion, the traditional one-step combustion reaction is decomposed into a two-step gas-solid reaction, avoiding the high-temperature backfire and heat loss problems that occur when fuel directly contacts air during combustion in the exhaust gas. By using oxygen carrier 26 to circulate between the first reaction tank 21 and the second reaction tank 22, energy is utilized in stages, improving the overall energy conversion efficiency of the system. Compared with the traditional direct combustion of exhaust gas in carbon black boilers, chemical looping combustion can make fuller use of the chemical energy in the exhaust gas, generate more usable heat energy, and improve energy conversion efficiency.

[0028] In some specific embodiments, the conveying unit includes a first conveying unit 23 and a second conveying unit 24. The two ends of the first conveying unit 23 are connected to the first reaction vessel 21 and the second reaction vessel 22, respectively. Specifically, one end of the first conveying unit 23 is connected to a first oxygen carrier outlet located at the top of the first reaction vessel 21, and the other end is connected to a first oxygen carrier inlet located at the top of the second reaction vessel 22, for conveying oxidized oxygen carrier 26 from the first reaction vessel 21 to the second reaction vessel 22. The two ends of the second conveying unit 24 are connected to the side walls of the first reaction vessel 21 and the second reaction vessel 22, respectively. Specifically, one end of the second conveying unit 24 is connected to a second oxygen carrier outlet located on the side of the second reaction vessel 22, and the other end is connected to a second oxygen carrier inlet located on the side of the first reaction vessel 21, for conveying reduced oxygen carrier 26 from the second reaction vessel 22 back to the first reaction vessel 21.

[0029] In some specific embodiments, in order to efficiently recover the heat generated by the reaction, a first heat exchange unit 25 is provided around the outer periphery of the first reaction tank 21, and a first air distribution component 215 is provided on the inner side of the bottom. Demineralized water is introduced into the first heat exchange unit 25 to absorb the heat released by the oxidation reaction in the first reaction tank 21 to generate steam. The first air distribution component 215 is used to distribute the incoming air to form a swirling flow, so as to promote the oxidation reaction of the oxygen carrier 26 in the first reaction tank 21.

[0030] Specifically, such as Figure 5 As shown, the first air distribution assembly 215 includes a first distribution disk 2151 and a second distribution disk 2152 arranged in parallel. The first distribution disk 2151 is located above the second distribution disk 2152. The first distribution disk 2151 includes a first cylinder and a first air pipe evenly distributed around the outer periphery of the first cylinder. The angle between the line connecting the end of the first air pipe to the center of the first cylinder and its surface is 30-45°. The second distribution disk 2152 includes a second cylinder and a second air pipe evenly distributed around the outer periphery of the second cylinder. The angle between the line connecting the end of the second air pipe to the center of the second cylinder and its surface is 10-20°. By setting air tubes with different inclination angles evenly distributed on the outer periphery of the first distribution plate 2151 and the second distribution plate 2152, on the one hand, the air is made to swirl, which promotes the full mixing of oxygen carrier 26 and air, facilitates the fluidized oxidation of oxygen carrier 26 and air, and promotes the oxidation reaction of oxygen carrier 26 and air; on the other hand, a pressure difference is generated and an air flow is formed distributed to both sides, which makes the air swirl upward along the two side channels, accelerating the oxidation reaction of oxygen carrier 26 and air.

[0031] In some specific embodiments, such as Figure 2As shown, to further enhance the reaction effect, the first reaction vessel 21 is also equipped with a flow guiding component 212, located above the first air distribution component 215. The flow guiding component 212 includes a V-shaped first flow guiding plate 2121 and multiple parallel second flow guiding plates 2122 located inside the V-shaped structure. The first flow guiding plate 2121 and the second flow guiding plates 2122 together form a serpentine airflow channel, used to extend the mixing path of air and oxygen carrier and enhance turbulence. Both the first flow guiding plate 2121 and the second flow guiding plate 2122 are corrugated plates, and the lengths of the multiple second flow guiding plates 2122 are successively shortened along their setting direction to adapt to the V-shaped flow guiding structure of the first flow guiding plate 2121.

[0032] On the other hand, in some specific embodiments, such as Figure 3 As shown, the first reaction vessel 21 can also be configured as a hollow conical vessel structure, including a conical inner wall 213 and a conical outer wall 214. The conical inner wall 213 and the conical outer wall 214 enclose a conical cavity. Both the conical inner wall 213 and the conical outer wall 214 are corrugated, and the corrugated walls generate more complex turbulent motion in the airflow, enhancing mass and heat transfer. In this case, the first heat exchange unit 25 is disposed on the outer periphery of the conical outer wall 214, and the second heat exchange unit 27 is also disposed closely against the inner side of the conical inner wall 213. The shapes of the first heat exchange unit 25 and the second heat exchange unit 27 are adapted to the shapes of the conical outer wall 214 and the conical inner wall 213 to maximize the recovery of heat inside the vessel.

[0033] In some specific embodiments, a second air distribution assembly 216 and a turbulence-dispersing assembly 223 are sequentially arranged from bottom to top inside the second reaction vessel 22. The second air distribution assembly 216 has the same structure as the first air distribution assembly 215 and is used to distribute the incoming exhaust gas to form a swirling flow. Figure 4 As shown, the turbulence assembly 223 includes a rotating shaft and a first fan 2232, a spiral blade 2233, and a second fan 2234 arranged sequentially along the axis of the rotating shaft. The rotating shaft is rotatably mounted on the inner wall of the second reaction vessel 22 via a mounting bracket 2231. The spiral blade 2233 is spirally wound around the outer surface of the rotating shaft to provide turbulence and flow obstruction, thereby extending the reaction path between the oxygen carrier 26 and the carbon black exhaust gas. The first fan 2232 and the second fan 2234 rotate in opposite directions to increase the turbulence effect in the vertical direction and promote the gas-solid reaction.

[0034] In some specific embodiments, the device also includes a steam turbine unit 5 and a water tank 6. The steam turbine unit 5 is connected to the steam outlet of the heat exchange unit located at the reaction tank 2, using the generated high-temperature and high-pressure steam to generate electricity or provide heat. The water inlet of the water tank 6 is connected to the condensate outlet of the steam turbine unit 5, and its outlet is connected to the water inlet of each heat exchange unit of the reaction tank 2 through a feed water pump 7, forming a water-steam circulation loop to realize the recycling of water resources.

[0035] The working process of the carbon black tail gas energy recovery device provided in this application is as follows: The carbon black exhaust gas first enters the surface heat exchanger 1, where it heats the purified exhaust gas returned from the subsequent process and simultaneously cools itself down. It then enters the spray heat exchanger 4 for deep dehydration and secondary cooling, before entering the exhaust gas pretreatment device 3 to remove sulfides. The purified, low-temperature exhaust gas returns to the surface heat exchanger 1 for heating and drying, and then enters the second reaction tank 22 of the reaction tank 2. Inside the second reaction tank 22, the exhaust gas reacts with the oxidized oxygen carrier from the first reaction tank 21, releasing chemical energy and converting it into a reduced oxygen carrier. The reduced oxygen carrier is then transported to the first reaction tank 21, where it undergoes a strong exothermic oxidation reaction with air. The heat generated by the reaction is transferred to the demineralized water through the first heat exchange unit 25 and the second heat exchange unit 27 to generate steam. The steam enters the steam turbine unit 5 to perform work, and the condensate is returned to the water tank for recycling, thus achieving efficient purification and energy recovery of the carbon black exhaust gas.

[0036] On the other hand, before the pretreated carbon black tail gas is introduced, a common heat exchanger can be normally introduced into the heat source inlet of the surface heat exchanger 1 to recover the high-temperature heat contained in the pretreated carbon black tail gas for the production of superheated steam or other clean process fluids. At this time, the untreated carbon black tail gas enters from the bottom of the surface heat exchanger 1, and after being cooled by heat exchange, it is discharged from the top of the surface heat exchanger 1 and enters the interior of the spray heat exchanger 4 for dehydration, cooling and other treatments. Then, the carbon black tail gas after the initial cooling enters the tail gas pretreatment device 3 for desulfurization treatment, and then enters the surface heat exchanger 4. The carbon black tail gas is heated and dried in the heater 1, and then the treated tail gas is introduced into the reaction tank 2. In the reaction tank 2, the combustible gas in the carbon black tail gas undergoes chemical loop combustion heat exchange. Through the circulation of oxygen carrier 26, the traditional one-step combustion is decomposed into a two-step gas-solid reaction, which heats the demineralized water in the corresponding heat exchange unit located in the reaction tank 2 to generate high-temperature and high-pressure steam. The high-temperature and high-pressure steam then enters the steam turbine unit 5 to be converted into electrical energy. Some of the steam can also be used in related production lines of the carbon black production line. The condensed steam condensate is collected in the water tank 6 and pumped into the corresponding heat exchange unit in the reaction tank 2 by the high-pressure feed water pump 7 for recycling.

[0037] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0041] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A carbon black tail gas energy recovery device, characterized in that, include: The surface heat exchanger (1) is connected to the carbon black production line and is used to introduce the carbon black tail gas to be treated and to heat and dry the pretreated carbon black tail gas. The spray heat exchanger (4) is connected to the surface heat exchanger (1) and is used to perform secondary cooling and dehydration on the carbon black tail gas to be treated after the initial cooling by the surface heat exchanger (1). The exhaust gas pretreatment device (3) is connected at one end to the spray heat exchanger (4) and at the other end to the surface heat exchanger (1). It is used to pretreat the carbon black exhaust gas to be treated and to return the pretreated carbon black exhaust gas to the surface heat exchanger (1). The reaction vessel (2) is connected at one end to the surface heat exchanger (1) and contains an oxygen carrier (26). It includes a first reaction vessel (21) and a second reaction vessel (22). The first reaction vessel (21) and the second reaction vessel (22) are connected by a conveying unit to realize the circulation of the oxygen carrier (26).

2. The carbon black tail gas energy recovery device according to claim 1, characterized in that, The bottom of the first reaction vessel (21) is provided with an air inlet (211) for introducing air, so that the reduced oxygen carrier undergoes an oxidation reaction and releases heat. The bottom of the second reaction vessel (22) is provided with a tail gas inlet (221) for introducing tail gas from the tail gas pretreatment device (3), so that the oxidized oxygen carrier undergoes a reduction reaction and reforms into a reduced oxygen carrier.

3. The carbon black tail gas energy recovery device according to claim 2, characterized in that, The conveying unit includes a first conveying unit (23) and a second conveying unit (24), wherein: The two ends of the first conveying unit (23) are connected to the first reaction vessel (21) and the second reaction vessel (22) respectively, and are used to convey the oxidized oxygen carrier from the first reaction vessel (21) to the second reaction vessel (22). The two ends of the second conveying unit (24) are connected to the first reaction vessel (21) and the second reaction vessel (22) respectively, and are used to convey the reduced oxygen carrier from the second reaction vessel (22) back to the first reaction vessel (21).

4. The carbon black tail gas energy recovery device according to claim 3, characterized in that, The first reaction vessel (21) is fitted with a first heat exchange unit (25) on its outer periphery and a first air distribution component (215) is provided on the inner side of its bottom. Demineralized water is introduced into the first heat exchange unit (25) to absorb the heat released by the oxidation reaction in the first reaction vessel (21). The first air distribution component (215) is used to distribute air to form a swirling flow to promote the oxidation reaction of the oxygen carrier (26) in the first reaction vessel (21).

5. The carbon black tail gas energy recovery device according to claim 4, characterized in that, The first air distribution assembly (215) includes a first distribution plate (2151) and a second distribution plate (2152) arranged in parallel, with the first distribution plate (2151) located above the second distribution plate (2152); The first distribution plate (2151) includes a first cylinder and a first air pipe evenly distributed on the outer periphery of the first cylinder, and the angle between the line connecting the end of the first air pipe to the center of the first cylinder and its surface is 30-45°. The second distribution plate (2152) includes a second cylinder and a second air pipe evenly distributed on the outer periphery of the second cylinder, and the angle between the line connecting the end of the second air pipe to the center of the second cylinder and its surface is 10-20°.

6. The carbon black tail gas energy recovery device according to claim 5, characterized in that, The second reaction vessel (22) is provided with a second air distribution component (216) and a turbulence component (223) from bottom to top inside. The second air distribution component (216) has the same structure as the first air distribution component (215).

7. The carbon black tail gas energy recovery device according to claim 6, characterized in that, The turbulence assembly (223) includes a rotating shaft and a first fan (2232), a spiral blade (2233), and a second fan (2234) arranged sequentially along the axis of the rotating shaft. The rotating shaft is rotatably mounted on the inner wall of the second reaction vessel (22) via a mounting bracket (2231), and the first fan (2232) and the second fan (2234) rotate in opposite directions.

8. The carbon black tail gas energy recovery device according to claim 7, characterized in that, The first reaction vessel (21) is a hollow cylindrical tank structure, and a flow guiding component (212) is provided inside it. The flow guiding component (212) is located above the first air distribution component (215). The flow guiding component (212) includes a first flow guiding plate (2121) with a V-shaped structure and a plurality of parallel second flow guiding plates (2122) located inside the V-shaped structure. The first flow guiding plate (2121) and the second flow guiding plate (2122) together form a serpentine airflow channel. Both the first guide plate (2121) and the second guide plate (2122) are corrugated plates.

9. The carbon black tail gas energy recovery device according to claim 7, characterized in that, The first reaction vessel (21) is a hollow conical vessel structure, comprising: A conical inner wall (213) and a conical outer wall (214), and a conical receiving cavity formed by the conical inner wall (213) and the conical outer wall (214), wherein the conical inner wall (213) and the conical outer wall (214) are both wavy, and the conical outer wall (214) is fitted around the outer periphery of the conical inner wall (213); The inner side of the conical inner wall (213) is also fitted with a second heat exchange unit (27).

10. The carbon black tail gas energy recovery device according to claim 1, characterized in that, The device also includes a steam turbine unit (5) and a water tank (6). The steam turbine unit (5) is connected to the steam outlet of the heat exchange unit located at the reaction tank (2). The water inlet of the water tank (6) is connected to the condensate outlet of the steam turbine unit (5), and its outlet is connected to the water inlet of the heat exchange unit of the reaction tank (2) through a water pump (7), forming a water-steam circulation loop.

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