Novel carbon black tail gas boiler blow-off energy recovery device
By introducing a fixed-discharge expansion vessel, surface heater, and spray heat exchanger into the carbon black tail gas boiler, combined with a water treatment system and DCS control, the problem of poor heat recovery effect was solved, secondary steam recovery and stable operation of the unit were achieved, and energy waste was reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHAOYANG BLACK CAT WUXINGQI CARBON BLACK CO LTD
- Filing Date
- 2025-05-09
- Publication Date
- 2026-05-19
AI Technical Summary
Existing carbon black tail gas boilers have poor heat recovery efficiency during the wastewater discharge process, and the practicality of the equipment is reduced, resulting in serious energy waste.
A heat recovery system consisting of a constant discharge expansion vessel, surface heaters, and spray heat exchangers, combined with a water treatment system and a DCS control system, enables secondary steam recovery and automated control, eliminating the need for manual maintenance.
It improves the heat recovery efficiency, enhances the practicality of the device, and enables stable unattended operation, thereby reducing energy waste.
Smart Images
Figure CN224262245U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of boiler blowdown energy recovery technology, specifically a novel carbon black tail gas boiler blowdown energy recovery device. Background Technology
[0002] A carbon black tail gas boiler is a device specifically designed to treat the tail gas generated during carbon black production. It converts the chemical energy of the combustible components in the carbon black tail gas into heat energy, producing steam or hot water. This steam or hot water can be used for heating, power generation, or other industrial applications. The boiler's operation mainly consists of an in-furnace combustion process and an in-boiler heat exchange process. The carbon black tail gas mixes with combustion air in the burner and is ignited, forming a high-temperature flame that converts chemical energy into heat energy. The high-temperature flue gas passes through the boiler's heating surfaces, transferring heat to the water inside, causing it to evaporate into steam. During operation, the carbon black tail gas boiler generates a certain amount of wastewater containing heat energy. This wastewater heat energy can be recovered and reused for boiler heating or power generation through a wastewater recovery device.
[0003] Traditional carbon black tail gas boilers require regular and continuous blowdown operations during operation, which generate a large amount of low-grade heat energy in the steam. This energy, which has recovery value, is often not effectively utilized, resulting in significant energy waste. Some carbon black tail gas boilers incorporate blowdown energy recovery devices, using heat exchange tubes within the device to recover and utilize the heat energy from the wastewater, thus avoiding energy waste. However, this method, which only recovers heat energy from the steam in the carbon black tail gas through heat exchange tubes, not only reduces the recovery efficiency but also diminishes the practicality of the device. Therefore, a novel blowdown energy recovery device for carbon black tail gas boilers is proposed. Utility Model Content
[0004] (a) Technical problems to be solved
[0005] To address the shortcomings of existing technologies, this utility model provides a novel carbon black tail gas boiler wastewater recovery device, which solves the aforementioned technical problems that not only reduce the recovery effect but also decrease the practicality of the device.
[0006] (II) Technical Solution
[0007] To achieve the above objectives, this utility model provides the following technical solution: a novel carbon black tail gas boiler blowdown energy recovery device, comprising:
[0008] A carbon black tail gas furnace, and a fixed exhaust expansion container located outside the carbon black tail gas furnace, wherein the steam outlet of the carbon black tail gas furnace is connected to the steam inlet of the fixed exhaust expansion container.
[0009] A surface heater is installed above the fixed discharge expansion vessel, and the steam inlet of the surface heater is connected to the steam outlet of the fixed discharge expansion vessel. A spray heat exchanger is connected to the steam outlet of the surface heater, and a water treatment system is connected to the liquid inlet of the surface heater. A deaerator is installed in the carbon black tail gas furnace, and the hot water in the heat exchange tube of the surface heater is used by the deaerator in the carbon black tail gas furnace.
[0010] The three-stage sedimentation tank is located below the surface heater. The inlet of the three-stage sedimentation tank is connected to the outlet of the fixed discharge expansion vessel, the surface heater, and the spray heat exchanger. There are three sets of outlets in the three-stage sedimentation tank. The first and second outlets of the three-stage sedimentation tank are connected to a sewage pipe, and the third outlet of the three-stage sedimentation tank is connected to a water tank. The surface of the water tank is provided with a chemical dosing port. After the demineralized water is introduced into the surface heater through the water treatment system, the steam-water mixture generated by the carbon black tail gas furnace is introduced into the fixed discharge expansion container for steam-water separation. The water is discharged into the three-stage sedimentation tank, while the steam first enters the surface heater to heat the demineralized water. The heated demineralized water is then transported to the deaerator of the carbon black tail gas boiler for use. After the steam enters the spray heat exchanger along the surface heater, it directly exchanges heat with the spray water to become water, which is then discharged into the three-stage sedimentation tank. The treated water in the three-stage sedimentation tank is then transported into a water tank, where appropriate chemicals are added for further treatment. Simultaneously, the water in the water tank can be transported to the carbon black waste heat boiler or the spray heat exchanger for use. This device is controlled by a DCS control system. On the one hand, heat energy recovery through the surface heater and spray heat exchanger not only allows for secondary recovery and reuse of steam, maximizing the heat energy recovery effect and improving the practicality of the device; on the other hand, the device operates stably and requires no manual maintenance, thus achieving unattended operation.
[0011] Preferably, a first pipe connects the constant discharge expansion vessel and the surface heater, and an electrically adjustable valve is installed on the surface of the first pipe. The flow rate between the constant discharge expansion vessel and the surface heater can be precisely controlled by the electrically adjustable valve, and automatic adjustment can be achieved.
[0012] Preferably, the liquid inlet of the surface heater is connected to a second pipe, and a safety valve is installed on the surface of the second pipe. The safety valve ensures the safe use of the surface heater.
[0013] Preferably, the heat exchange end of the spray heat exchanger is connected to a spray device, and a secondary regulating valve is installed at the water inlet end of the heat exchange tube. The flow rate of cooling water through the spray device can be adjusted by the secondary regulating valve.
[0014] Preferably, a third pipe connects the water tank and the third outlet of the tertiary sedimentation tank, and a recovery pump is installed at the end of the third pipe. Water from the tertiary sedimentation tank can be transported to the interior of the water tank via the recovery pump, the third pipe, and the third outlet.
[0015] Preferably, the outlet of the water tank is connected to a carbon black water supply pump, and a carbon black waste heat boiler is also installed outside the water tank. The outlet of the carbon black water supply pump is connected to both the carbon black waste heat boiler and the heat exchange tubes. The carbon black water supply pump can transport water from the water tank to the carbon black waste heat boiler, and simultaneously transport it through pipelines to the spray heat exchanger for use.
[0016] (III) Beneficial Effects
[0017] Compared with the prior art, this utility model provides a novel carbon black tail gas boiler blowdown energy recovery device, which has the following beneficial effects:
[0018] This novel carbon black tail gas boiler blowdown and energy recovery device introduces demineralized water into a surface heater via a water treatment system. The carbon black tail gas boiler then introduces the generated steam-water mixture into a fixed-discharge expansion container for steam-water separation. The water is discharged into a three-stage sedimentation tank. Steam first enters the surface heater to heat the demineralized water, which is then transported to the carbon black tail gas boiler deaerator for use. After steam enters the spray heat exchanger along the surface heater, it directly exchanges heat with the spray water to become water, which is then discharged into the three-stage sedimentation tank. The treated water is transported into a water tank, where appropriate chemicals are added for further treatment. Simultaneously, the water in the tank can be transported to a carbon black waste heat boiler or a spray heat exchanger for use. The system is controlled by a DCS system, recovering heat energy through surface heaters and spray heat exchangers. This not only allows for secondary steam recovery and reuse, maximizing heat recovery efficiency but also enhances the system's practicality. Furthermore, the system operates stably and requires no manual maintenance, thus achieving unattended operation. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0020] In the diagram: 1. Carbon black tail gas furnace; 2. Fixed discharge expansion vessel; 3. Surface heater; 4. Spray heat exchanger; 5. Three-stage sedimentation tank; 6. Water tank. Detailed Implementation
[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0022] This utility model provides a technical solution: a novel carbon black tail gas boiler blowdown energy recovery device, comprising: (See details) Figure 1 Carbon black tail gas furnace 1, and a fixed exhaust expansion container 2 disposed outside the carbon black tail gas furnace 1, wherein the steam outlet end of the carbon black tail gas furnace 1 is connected to the steam inlet end of the fixed exhaust expansion container 2.
[0023] A surface heater 3 is installed above the fixed discharge expansion vessel 2, and the steam inlet of the surface heater 3 is connected to the steam outlet of the fixed discharge expansion vessel 2. A spray heat exchanger 4 is connected to the steam outlet of the surface heater 3, and a water treatment system is connected to the liquid inlet of the surface heater 3. A deaerator is installed inside the carbon black tail gas furnace 1. A heat exchange tube is built into the surface heater 3, and the heated water in the heat exchange tube is transferred to the deaerator.
[0024] The three-stage sedimentation tank 5 is located below the surface heater 3. The inlet of the three-stage sedimentation tank 5 is connected to the outlet of the fixed discharge expansion container 2, the surface heater 3 and the spray heat exchanger 4 respectively. There are three sets of outlets of the three-stage sedimentation tank 5. The first outlet and the second outlet of the three-stage sedimentation tank 5 are connected to the sewage pipe, and the third outlet of the three-stage sedimentation tank 5 is connected to the water tank 6. The surface of the water tank 6 is provided with a chemical dosing port. After the demineralized water is introduced into the surface heater 3 through the water treatment system, the steam generated by the carbon black tail gas furnace 1 is introduced into the constant discharge expansion vessel 2 for steam-water separation. The water is discharged into the three-stage sedimentation tank 5. The steam first enters the surface heater 3 to heat the demineralized water, and then the heated demineralized water is sent to the deaerator of the carbon black tail gas boiler for use. After the steam enters the spray heat exchanger 4 along the surface heater 3, it directly exchanges heat with the spray water to become water, and then the water is discharged into the three-stage sedimentation tank 5. The treated water in the three-stage sedimentation tank 5 is then sent to the water supply system. Inside tank 6, appropriate chemicals are added to the water tank 6 through the dosing port for treatment. At the same time, the water in tank 6 can be transported to the carbon black waste heat boiler and then sent to the spray heat exchanger 4 for use. This device is controlled by a DCS control system. On the one hand, heat energy is recovered through the surface heater 3 and the spray heat exchanger 4, which not only allows for secondary recovery and utilization of steam, but also maximizes the heat energy recovery effect and improves the practicality of the device. On the other hand, this device operates stably and requires no manual maintenance during operation, thus achieving unattended operation.
[0025] Please see Figure 1 A first pipe connects the constant discharge expansion vessel 2 and the surface heater 3, and an electric regulating valve is installed on the surface of the first pipe. The electric regulating valve can precisely control the flow rate between the constant discharge expansion vessel 2 and the surface heater 3, and achieve automatic adjustment. The liquid inlet end of the surface heater 3 is connected to a second pipe, and a safety valve is installed on the surface of the second pipe. The safety valve can ensure the safe use of the surface heater 3. The heat exchange end of the spray heat exchanger 4 is connected to a spray device, and a secondary regulating valve is installed at the water inlet end of the spray device. The flow rate of cooling water through the spray device can be adjusted by the secondary regulating valve. A third pipe connects the water tank 6 and the third liquid outlet end of the tertiary sedimentation tank 5, and a recovery pump is installed at the end of the third pipe. The water in the tertiary sedimentation tank 5 can be transported to the interior of the water tank 6 through the recovery pump, the third pipe, and the third liquid outlet end. The liquid outlet end of the water tank 6 is connected to a carbon black water supply pump, and a carbon black waste heat boiler is also installed outside the water tank 6. The liquid outlet end of the carbon black water supply pump is connected to the carbon black waste heat boiler and the heat exchange tube respectively. The carbon black water supply pump can transport water from the water tank 6 to the carbon black waste heat boiler or through the heat exchange pipe to the spray heat exchanger 4 for use.
[0026] This scheme involves introducing demineralized water into the surface heater 3 via a water treatment system. The steam generated by the carbon black tail gas furnace 1 is then introduced into the constant discharge expansion vessel 2 for steam-water separation. The water is discharged into the three-stage sedimentation tank 5. The steam first enters the surface heater 3 to heat the demineralized water, which is then transported to the deaerator of the carbon black tail gas boiler for use. The steam then enters the spray heat exchanger 4 along the surface heater 3 and directly exchanges heat with the spray water to become water. This water is then discharged into the three-stage sedimentation tank 5. The treated water in the three-stage sedimentation tank 5 is then transported into the water tank 6, where appropriate chemicals are added for further treatment. Simultaneously, the water in the water tank 6 can be transported to the carbon black waste heat boiler or the spray heat exchanger 4 for use. This device is controlled by a DCS control system.
[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A novel carbon black tail gas boiler blowdown energy recovery device, characterized in that, include: Carbon black tail gas furnace (1), and a fixed exhaust expansion container (2) disposed outside the carbon black tail gas furnace (1), wherein the steam outlet end of the carbon black tail gas furnace (1) is connected to the steam inlet end of the fixed exhaust expansion container (2). A surface heater (3) is installed above the fixed discharge expansion vessel (2), and the steam inlet of the surface heater (3) is connected to the steam outlet of the fixed discharge expansion vessel (2). A spray heat exchanger (4) is connected to the steam outlet of the surface heater (3), and a water treatment system is connected to the liquid inlet of the surface heater (3). A deaerator is installed inside the carbon black tail gas furnace (1). A heat exchange tube is built into the surface heater (3), and the heated water in the heat exchange tube is transferred to the deaerator. The three-stage sedimentation tank (5) is located below the surface heater (3). The inlet of the three-stage sedimentation tank (5) is connected to the outlet of the fixed discharge expansion container (2), the surface heater (3) and the spray heat exchanger (4). There are three sets of outlets in the three-stage sedimentation tank (5). The first outlet and the second outlet of the three-stage sedimentation tank (5) are connected to a sewage pipe. The third outlet of the three-stage sedimentation tank (5) is connected to a water tank (6). A dosing port is opened on the surface of the water tank (6).
2. The novel carbon black tail gas boiler blowdown energy recovery device according to claim 1, characterized in that: The fixed-discharge expansion container (2) is connected to the surface heater (3) by a first pipe, and an electric regulating valve is installed on the surface of the first pipe.
3. The novel carbon black tail gas boiler blowdown energy recovery device according to claim 1, characterized in that: The inlet end of the surface heater (3) is connected to a second pipe, and a safety valve is installed on the surface of the second pipe.
4. The novel carbon black tail gas boiler blowdown energy recovery device according to claim 1, characterized in that: The heat exchange end of the spray heat exchanger (4) is connected to a spray device, and a secondary regulating valve is installed at the water inlet end of the spray device.
5. A novel carbon black tail gas boiler blowdown energy recovery device according to claim 1, characterized in that: A third pipe is connected between the water tank (6) and the third outlet of the three-stage sedimentation tank (5), and a recovery pump is installed at the end of the third pipe.
6. A novel carbon black tail gas boiler blowdown energy recovery device according to claim 4, characterized in that: The outlet of the water tank (6) is connected to a carbon black water supply pump. A carbon black waste heat boiler is also installed outside the water tank (6). The outlet of the carbon black water supply pump is connected to the carbon black waste heat boiler and the heat exchange tube respectively.