Dehydrating tower for dehydrating carbon black tail gas

Abstract

The utility model discloses a dehydrating tower for dehydrating carbon black tail gas, and belongs to the technical field of dehydrating towers. The dehydrating tower for dehydrating the carbon black tail gas comprises a tower body, a carbon black tail gas pipeline, a steering plate assembly and a kettle bottom partition plate, the tower body is provided with an inner cavity and a carbon black tail gas inlet; the carbon black tail gas pipeline is connected with the carbon black tail gas inlet; the deflector assembly is arranged in the inner cavity of the tower body and is connected with the carbon black tail gas inlet; the kettle bottom partition plate is arranged in the inner cavity of the tower body, is positioned below the steering plate assembly and is used for dividing the kettle bottom of the dehydrating tower into a first kettle liquid collecting tank and a second kettle liquid collecting tank, and the first kettle liquid collecting tank is positioned right below the steering plate assembly. According to the dehydrating tower for dehydrating the carbon black tail gas, water, oil salt and the like in the carbon black tail gas are efficiently separated through the innovative structural design of the deflecting plate assembly and the kettle bottom partition plate and are prevented from entering a boiler to influence the heat efficiency, and the service life of equipment is remarkably prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of dehydration tower technology, and in particular relates to a dehydration tower for dehydrating carbon black tail gas. Background Technology

[0002] In carbon black production, raw material oils (heavy oils such as anthracene oil, coal tar, and ethylene tar) are atomized and sprayed into a reactor for combustion to generate high-temperature carbon black tail gas, which contains a large amount of moisture, tar, salt particles, and combustible hydrocarbons. After rapid cooling, waste heat recovery to 280°C, and dust removal, the tail gas needs to pass through a dehydration tower to remove moisture (target control below 20%). Part of the dehydrated tail gas is used as fuel gas and purging gas, while the remainder is sent to a tail gas boiler for combustion to produce steam to achieve heat balance. However, the packed spray scrubbing dehydration towers commonly used in the carbon black industry have core technical problems: poor internal spraying effect, uneven gas-liquid distribution, and low tail gas velocity, resulting in incomplete removal of impurities such as moisture, tar, and salt particles from the tail gas. Oil-salt mixed impurities easily clog plate heat exchangers during circulation, and corrosive components that are not removed (such as NOx, SO2, and water-based compounds) accumulate in downstream boilers and pipelines, causing low-temperature corrosion, reduced thermal efficiency, and unstable temperature rise, seriously affecting the safe and stable operation of the equipment. Furthermore, inefficient dehydration allows a large amount of water to enter the boiler system, which not only exacerbates energy waste and disrupts steam balance, but also increases equipment maintenance costs and weakens the company's market competitiveness.

[0003] Therefore, developing new dehydration towers to solve problems such as uneven spray distribution, low impurity removal efficiency, and easy clogging and corrosion in existing equipment, and to achieve the required water content in the exhaust gas, is crucial for improving the safety, stability, and energy utilization efficiency of carbon black production systems. Summary of the Invention

[0004] In view of the shortcomings of the related technologies, the purpose of this utility model is to provide a dehydration tower for carbon black tail gas dehydration, so as to solve the problems mentioned in the background technology.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A dehydration tower for dehydrating carbon black tail gas includes:

[0007] The tower body has an internal cavity and a carbon black exhaust gas inlet is provided on the tower body.

[0008] Carbon black exhaust gas pipeline, the carbon black exhaust gas pipeline is connected to the carbon black exhaust gas inlet;

[0009] The steering plate assembly is located inside the tower body and is connected to the carbon black exhaust gas inlet.

[0010] The bottom partition plate is located inside the tower body and below the turning plate assembly. The bottom partition plate is used to divide the bottom of the dehydration tower into a first liquid collection tank and a second liquid collection tank, wherein the first liquid collection tank is located directly below the turning plate assembly.

[0011] In some embodiments, the steering plate assembly includes a first plate and three second plates, the first plate being arranged laterally above the carbon black exhaust gas inlet, and the three second plates being arranged circumferentially and vertically along the first plate to form a steering chamber surrounding a bottom opening of the carbon black exhaust gas inlet.

[0012] In some embodiments, the first plate is inclined toward the second liquid collection tank.

[0013] In some embodiments, the bottom partition plate and the second plate opposite the carbon black exhaust gas inlet are located on the same vertical plane.

[0014] In some embodiments, the first liquid collection tank is equipped with a liquid level detector.

[0015] In some embodiments, the first liquid collection tank is provided with a liquid extraction pipe, and a liquid extraction pump is provided on the liquid extraction pipe.

[0016] In some embodiments, the dehydration tower for carbon black tail gas dehydration also includes a carbon black tail gas return pipe, which connects the kettle liquid extraction pipe and the carbon black tail gas pipe to transport residual carbon black tail gas in the kettle liquid.

[0017] In some embodiments, the carbon black exhaust gas duct is inclined toward the bottom of the dehydration tower.

[0018] In some embodiments, the diameter of the carbon black exhaust pipe is smaller than the diameter of the inner cavity of the tower.

[0019] In some embodiments, the dehydration tower for carbon black tail gas dehydration also includes a spray device and a packing device disposed in the inner cavity of the tower body. The spray device is located at the top of the tower body, and the packing device is located below the spray device and above the deflector plate assembly.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] 1. The dehydration tower for carbon black tail gas dehydration provided by this utility model changes the original single collection area design at the bottom through the innovative structure of the bottom partition plate. The deflecting plate assembly changes the airflow direction and increases the inlet pressure and flow rate, so that impurities are stripped from the tail gas at high flow rate and enriched in the first liquid collection tank, thus realizing the efficient removal and collection of impurities.

[0022] 2. The first pot liquid collection tank of the dehydration tower for carbon black tail gas dehydration provided by this utility model includes a liquid level detector and a pot liquid extraction pump. By optimizing the system and adding detection methods, the liquid level is adjusted in real time to realize automatic control of the liquid level in the first pot liquid collection tank, avoiding gas blockage, overpressure, or reduced dehydration effect. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0024] Figure 1 This is a schematic front view of the dehydration tower structure of one embodiment of the dehydration tower for carbon black tail gas dehydration according to this utility model;

[0025] Figure 2 This is a schematic right view of the dehydration tower structure of one embodiment of the dehydration tower for carbon black tail gas dehydration of this utility model;

[0026] Figure 3 This is a schematic top view of the dehydration tower structure of one embodiment of the dehydration tower for carbon black tail gas dehydration of this utility model;

[0027] Figure 4 This is a flowchart illustrating the process of one embodiment of the dehydration tower for carbon black tail gas dehydration according to this utility model.

[0028] In the picture:

[0029] 1. Tower body; 11. Inner cavity; 12. Carbon black tail gas inlet; 2. Carbon black tail gas pipeline; 3. Diverting plate assembly; 31. First plate; 32. Second plate; 4. Bottom partition plate; 41. First reactor liquid collection tank; 401. Liquid level detector; 402. Reactor liquid outflow pipeline; 403. Reactor liquid outflow pump; 42. Second reactor liquid collection tank; 5. Carbon black tail gas return pipeline; 6. Spraying device; 7. Packing device. Detailed Implementation

[0030] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0031] In the description of this utility model, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] See appendix Figures 1 to 4 This invention provides an illustrative embodiment of the dehydration tower for carbon black tail gas dehydration proposed in this utility model. The dehydration tower for carbon black tail gas dehydration includes a tower body 1, a carbon black tail gas pipeline 2, a steering plate assembly 3, and a bottom partition plate 4.

[0034] The tower body 1 has an inner cavity 11, and a carbon black tail gas inlet 12 is provided on the tower body 1. A carbon black tail gas pipe 2 connects to the carbon black tail gas inlet 12, allowing the carbon black tail gas to smoothly enter the dehydration tower. A deflector plate assembly 3 is located in the inner cavity 11 of the tower body 1 and is connected to the carbon black tail gas inlet 12. A bottom partition plate 4 is located in the inner cavity 11 of the tower body 1, below the deflector plate assembly 3. The bottom partition plate 4 divides the bottom of the dehydration tower into a first bottom liquid collection tank 41 and a second bottom liquid collection tank 42, wherein the first bottom liquid collection tank 41 is located directly below the deflector plate assembly 3. The first bottom liquid collection tank 41 and the second bottom liquid collection tank 42 can collect bottom liquids of different concentrations respectively, improving dehydration efficiency and collection targeting. The first bottom liquid collection tank 41 is used to collect the concentrated bottom liquid of the dehydration tower, and the second bottom liquid collection tank 42 is used to collect the sprayed bottom liquid of the dehydration tower. Collecting the concentrate and spray liquid separately can prevent cross-contamination and also prevent the concentrate from clogging the plate heat exchanger.

[0035] The deflector assembly 3 includes a first plate 31 and three second plates 32. The first plate 31 is arranged laterally and is located above the carbon black exhaust gas inlet 12. The three second plates 32 are arranged vertically around the first plate 31 to form a deflector chamber surrounding the bottom opening of the carbon black exhaust gas inlet 12. The first plate 31 and the second plates 32 can quickly change the airflow direction of the carbon black exhaust gas, increase the inlet pressure, and increase the exhaust gas velocity. This allows the carbon black exhaust gas to pass through the deflector assembly 3 at a certain flow rate to remove impurities. The removed impurities can then flow into the first reactor liquid collection tank 41 under the action of gravity and be collected.

[0036] The steering plate assembly 3 increases pipeline resistance and suddenly changes the direction of medium flow, causing water, oil, salt and other substances in the carbon black tail gas to fall due to gravity and be enriched in the first reactor liquid collection tank 41. This prevents water from being carried into the carbon black tail gas boiler and affecting thermal efficiency. Unstable water content can cause fluctuations in gas control, leading to equipment overheating or low-temperature corrosion and carbon buildup. Tail gas dehydration can fundamentally extend the service life of the equipment.

[0037] In this embodiment, the carbon black exhaust gas pipe 2, the steering plate assembly 3, and the bottom partition plate 4 can be made of corrosion-resistant steel plates, which are low in cost and easy to maintain and replace.

[0038] The dehydration tower for carbon black tail gas dehydration also includes a spray device 6 and a packing device 7 located in the inner cavity 11 of the tower body 1. The spray device 6 is located at the top of the tower body 1, and the packing device 7 is located below the spray device 6 and above the deflector plate assembly 3. After the carbon black tail gas passes through the deflector plate assembly 3 for main separation, the carbon black tail gas is turned and passes through the packing device 7 in the middle of the dehydration tower to achieve convective contact with the spray liquid from the spray device 6 at the top, removing impurities such as moisture, tar, and salt particles from the carbon black tail gas. Finally, the carbon black tail gas flows to the top of the dehydration tower and is transported to the carbon black tail gas boiler through the tail gas main pipe for use as fuel gas. The removed impurities and spray liquid are collected in the second reactor liquid collection tank 42 under the action of gravity. The reactor liquid in the second reactor liquid collection tank 42 achieves automatic spray heat exchange under the original liquid level control and plate heat exchanger heat exchange control. After passing through the turning chamber, the carbon black exhaust gas enters the packing device 7 for further impurity removal. Compared with the previous oil and salt impurities, the spray liquid has reduced impurities, which solves the problems of easy clogging of plate heat exchangers and easy corrosion of pipelines.

[0039] The first plate 31 is inclined toward the second liquid collection tank 42. The first plate 31 has a certain slope, which prevents the spray liquid from the top of the tower from entering the first liquid collection tank 41, and facilitates the collection of the spray liquid into the second liquid collection tank 42 under the action of gravity.

[0040] The bottom partition plate 4 and the second plate 32 opposite to the carbon black tail gas inlet 12 are located on the same vertical plane. In some embodiments, the bottom partition plate 4 is directly connected to the second plate 32 opposite to the carbon black tail gas inlet 12. This arrangement optimizes the bottom space partitioning, making the division of the first liquid collection tank 41 and the second liquid collection tank 42 more reasonable and improving the liquid collection efficiency. See Appendix Figure 1 , Figure 2 and Figure 4 The ultra-high water level of the first liquid collection tank 41 and the second liquid collection tank 42 is lower than the height of the bottom partition plate 4, and a set distance is reserved to ensure the smooth passage of carbon black exhaust gas from the turning chamber to the inner cavity 11.

[0041] The first reactor liquid collection tank 41 is equipped with a liquid level detector 401. The liquid level detector 401 is used to monitor the liquid level of the concentrated liquid collected in the first reactor liquid collection tank 41 in real time, so that the staff can keep abreast of the liquid concentration, provide a basis for subsequent operations, and ensure the stable operation of the equipment.

[0042] The first reactor liquid collection tank 41 is equipped with a reactor liquid outlet pipe 402, and a reactor liquid outlet pump 403 is installed on the reactor liquid outlet pipe 402. The installation of the reactor liquid outlet pipe 402 and the reactor liquid outlet pump 403 can timely adjust the liquid level of the reactor liquid concentrate, avoid the carbon black tail gas flow cross-sectional area being too large or too small, which could cause gas blockage, overpressure, or reduced removal effect, and ensure the continuous and stable operation of the dehydration tower.

[0043] The dehydration tower for carbon black tail gas dehydration also includes a carbon black tail gas return pipe 5, which connects the kettle liquid outlet pipe 402 and the carbon black tail gas pipe 2 to transport the residual carbon black tail gas in the kettle liquid.

[0044] In some embodiments, the level detector 401, the kettle liquid collection pipe 402, and the kettle liquid collection pump 403 can be automatically controlled by a control system to ensure timely discharge of the kettle liquid concentrate. As the collected kettle liquid concentrate gradually rises in level, reaching the area indicated by the level detector 401, an interlocking control is triggered, activating the kettle liquid collection pump 403 to lower the level. The collected kettle liquid concentrate is then sent to the granulation tank. This prevents the rising level in the first kettle liquid collection tank 41 from affecting the carbon black tail gas flow rate, and also prevents the kettle liquid concentrate and any uncleaned oil and salt from entering the plate heat exchanger and causing blockages. Automatic level control simplifies operation and saves labor.

[0045] To enhance safety, in this embodiment, shut-off valves, general control valves, check valves, gate valves, drain valves, flow monitors, and pressure gauges can be installed at designated locations on the reactor liquid outlet pipe 402 and the carbon black tail gas return pipe 5, as needed. This combination of valves and instruments not only constructs a multi-layered safety protection system but also ensures the stable coordinated operation of the dehydration tower and upstream and downstream equipment through precise flow and pressure control. This effectively reduces safety hazards caused by human error, equipment failure, or changes in media characteristics, contributing to the long-term safe operation of the carbon black tail gas treatment system.

[0046] In this embodiment, the carbon black tail gas pipeline 2 is inclined toward the bottom of the dehydration tower, which facilitates the carbon black tail gas to flow into the tower body 1 by gravity, reduces the carbon black tail gas transport resistance, and improves the carbon black tail gas entry efficiency.

[0047] The diameter of the carbon black tail gas pipe 2 is smaller than the diameter of the inner cavity 11 of the tower body 1, so that the space increases rapidly after the carbon black tail gas enters the inner cavity 11 of the tower body 1, and the carbon black tail gas passes through the deflector plate assembly 3 at a certain flow rate to remove impurities and improve the dehydration effect.

[0048] In the above illustrative embodiments, the dehydration tower for carbon black tail gas dehydration features good impurity removal effect, long service life, easy maintenance, convenient automatic control operation, and a new structure that improves the removal effect to within 20%. It solves the problems of easy clogging of spray water heat exchange equipment and high water content at the boiler inlet, thereby improving the boiler's gas thermal efficiency, ensuring stable production, and reducing equipment maintenance frequency. Furthermore, it reduces the amount of oil and salt components in the carbon black tail gas entering the dehydration tower packing area, avoiding poor spray washing effect and uneven flow distribution.

[0049] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0050] The above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A dehydration tower for dehydrating carbon black tail gas, characterized in that, include: The tower body has an inner cavity and a carbon black exhaust gas inlet is provided on the tower body; A carbon black exhaust gas pipeline, wherein the carbon black exhaust gas pipeline is connected to the carbon black exhaust gas inlet; A steering plate assembly is disposed in the inner cavity of the tower body and is connected to the carbon black exhaust gas inlet; A bottom partition plate is provided in the inner cavity of the tower body. The bottom partition plate is located below the turning plate assembly. The bottom partition plate is used to divide the bottom of the dehydration tower into a first liquid collection tank and a second liquid collection tank, wherein the first liquid collection tank is located directly below the turning plate assembly.

2. The dehydration tower for carbon black tail gas dehydration according to claim 1, characterized in that, The steering plate assembly includes a first plate and three second plates. The first plate is arranged laterally and is located above the carbon black exhaust gas inlet. The three second plates are arranged vertically around the first plate to form a steering chamber surrounding the bottom opening of the carbon black exhaust gas inlet.

3. The dehydration tower for carbon black tail gas dehydration according to claim 2, characterized in that, The first plate is inclined toward the second liquid collection tank.

4. The dehydration tower for carbon black tail gas dehydration according to claim 2, characterized in that, The bottom partition plate and the second plate opposite to the carbon black exhaust gas inlet are located on the same vertical plane.

5. The dehydration tower for carbon black tail gas dehydration according to claim 1, characterized in that, The first liquid collection tank is equipped with a liquid level detector.

6. The dehydration tower for carbon black tail gas dehydration according to claim 5, characterized in that, The first liquid collection tank is equipped with a liquid extraction pipe, and the liquid extraction pipe is equipped with a liquid extraction pump.

7. The dehydration tower for carbon black tail gas dehydration according to claim 6, characterized in that, It also includes a carbon black tail gas return pipe, which connects the reactor liquid extraction pipe and the carbon black tail gas pipe to transport residual carbon black tail gas in the reactor liquid.

8. The dehydration tower for carbon black tail gas dehydration according to claim 1, characterized in that, The carbon black exhaust gas pipeline is inclined toward the bottom of the dehydration tower.

9. The dehydration tower for carbon black tail gas dehydration according to claim 1, characterized in that, The diameter of the carbon black exhaust gas pipe is smaller than the diameter of the inner cavity of the tower body.

10. The dehydration tower for carbon black tail gas dehydration according to claim 1, characterized in that, It also includes a spray device and a packing device disposed in the inner cavity of the tower body. The spray device is located at the top of the tower body, and the packing device is located below the spray device and above the steering plate assembly.

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