A carbon black tail gas collection dehydration desulfurization purification integrated waste heat recovery system
The system, consisting of a GGH heat exchanger, multi-stage cooling equipment, and a wet desulfurization tower, solves the problems of dehydration and desulfurization in carbon black tail gas treatment, achieving efficient purification and waste heat recovery of carbon black tail gas. It is suitable for gas turbine power generation and achieves the effect of energy saving and emission reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG WINTECH TECH CO LTD
- Filing Date
- 2025-08-05
- Publication Date
- 2026-07-07
AI Technical Summary
Existing carbon black tail gas treatment systems are unable to simultaneously and efficiently dehydrate and desulfurize, resulting in a complex and inconvenient waste heat recovery process, and the temperature of carbon black tail gas is not suitable for direct entry into gas turbine power generation.
The system, consisting of a GGH heat exchanger, multi-stage cooling equipment, and a wet desulfurization tower, achieves dehydration and desulfurization of carbon black tail gas through multi-stage cooling and wet desulfurization, combined with a flue gas heater. The system also utilizes the high-temperature carbon black tail gas to heat the purified tail gas to a temperature suitable for the gas turbine.
It achieves efficient dehydration and desulfurization of carbon black exhaust gas, reduces the pollutant components in gas turbine flue gas, reduces energy waste, increases the temperature of carbon black exhaust gas to be suitable for power generation, simplifies system maintenance, and enables flexible control and energy conservation and emission reduction.
Smart Images
Figure CN224470830U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a waste heat recovery system that integrates dehydration, desulfurization and purification of carbon black tail gas, and belongs to the field of waste heat recovery technology. Background Technology
[0002] The large amount of waste gas generated during carbon black production (carbon black tail gas) contains harmful gases, explosive gases, carbon black dust, as well as hydrogen, carbon monoxide, etc. The total energy contained in the carbon black tail gas accounts for 50%-60% of the total energy of carbon black production. Producing 1 ton of carbon black generates approximately 8000-11000 Nm³ of energy. 3 The exhaust gas can produce 7 tons of steam and generate 1120 kilowatt-hours of electricity. Direct emission would severely pollute the atmosphere, but if it is used for combined heat and power (CHP) generation or as a boiler to sell steam directly to businesses, the exhaust gas and waste heat can be fully utilized, achieving energy conservation and emission reduction. Using carbon black exhaust gas for power generation saves energy, reduces CO2 emissions and carbon black dust pollution, and protects the environment. Currently, carbon black exhaust gas has the following uses: first, for CHP generation; second, for boilers to sell steam to businesses; third, for direct sale of carbon black exhaust gas to supply city gas and other gas-consuming points; or for direct power generation using gas turbines or internal combustion engines, with an efficiency of 30%-40%, and further recovery and reuse through preheating.
[0003] For example, Chinese Patent Publication No. CN220750849U discloses a carbon black tail gas waste heat recovery system, which can recover and reuse a large amount of condensate water by condensing carbon black tail gas to achieve the purpose of water saving. At the same time, it can also increase the calorific value of carbon black tail gas, which can be used to dry wet granulated carbon black or sent to boiler combustion for waste heat power generation.
[0004] The utilization of carbon black tail gas requires control of particulate matter and sulfide content. If the tail gas contains carbon black particles, it needs to be pretreated by cyclone separation, bag filter dust collection, or wet scrubbing. Sulfide control: If it contains H2S or SO2, desulfurization (such as wet desulfurization or activated carbon adsorption) is required, which involves complex processes. If dehydration, desulfurization, and purification can be integrated into one process, it will greatly facilitate the waste heat recovery process. Utility Model Content
[0005] The main purpose of this utility model is to provide a waste heat recovery system for carbon black tail gas that integrates dehydration, desulfurization and purification. It can take into account dehydration and desulfurization, while maintaining the carbon black tail gas at a relatively high temperature that can be directly fed into a gas turbine for power generation. It is a carbon black tail gas waste heat recovery system that is flexible in regulation, energy-saving and emission-reducing, and easy to maintain.
[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0007] A waste heat recovery system integrating dehydration, desulfurization, and purification of carbon black tail gas includes a gas-heated gas (GGH) heat exchanger, a multi-stage cooling device, a wet desulfurization tower, and a flue gas heater. The hot-side outlet of the GGH heat exchanger is connected to the hot-side inlet of the multi-stage cooling device. The hot-side outlets of each stage of the multi-stage cooling device are sequentially connected to their respective hot-side inlets. The hot-side outlet of the multi-stage cooling device is connected to the cold-side inlet of the flue gas heater, and the cold-side outlet of the flue gas heater is connected to the cold-side inlet of the GGH heat exchanger. The wet desulfurization tower is connected within the multi-stage cooling device. The hot-side outlet of the previous stage is connected to the gas inlet of the wet desulfurization tower, and the outlet of the wet desulfurization tower is connected to the hot-side inlet of the current stage. The hot water heated by the multi-stage cooling device first enters the flue gas heater and then the refrigeration unit. The chilled water produced by the refrigeration unit enters the multi-stage cooling device.
[0008] Carbon black tail gas enters the system through pipelines, first passing through a GGH heat exchanger where it exchanges heat with the cooled and dehydrated carbon black tail gas, raising the temperature of the cooled and dehydrated carbon black tail gas to a level suitable for direct entry into the gas turbine. After cooling, the carbon black tail gas exchanges heat with hot water in a multi-stage cooling system. The hot water then enters the chiller unit, where its heat is used to produce chilled water. During the cooling process, the carbon black tail gas enters a wet desulfurization tower for desulfurization. The cooled and desulfurized carbon black tail gas first enters a flue gas heater for preheating with hot water, then enters the GGH heat exchanger for further heating. After heating, the carbon black tail gas can reach temperatures above 150°C before entering the gas turbine. Utilizing the high-temperature inlet carbon black tail gas to heat the desulfurized and dehydrated carbon black tail gas allows for higher temperatures and increases the usable space. The gas-to-gas heat exchange is placed at points with significant temperature differences between the hot and cold sides, reducing the heat exchange area.
[0009] The dehydration and cooling process adds a desulfurization step, reduces desulfurization consumption, effectively removes impurities, and reduces the pollutants in the flue gas from the gas turbine.
[0010] Deep cooling with chilled water ensures more thorough dehydration. The heat from the hot water used for refrigeration is provided by the high-temperature carbon black tail gas, fully recovering the waste heat from the carbon black tail gas.
[0011] The modular design of each heat exchanger facilitates manufacturing and on-site installation, saving space to the greatest extent.
[0012] Preferably, the multi-stage cooling equipment includes a water-cooled high-temperature section, a water-cooled medium-temperature section, and a water-cooled low-temperature section. The hot-side outlet of the exhaust gas from the water-cooled high-temperature section is connected to the hot-side inlet of the exhaust gas from the water-cooled medium-temperature section. The hot-side outlet of the exhaust gas from the water-cooled medium-temperature section is connected to the gas inlet of the wet desulfurization tower. The outlet of the wet desulfurization tower is connected to the hot-side inlet of the exhaust gas from the water-cooled low-temperature section. The hot-side outlet of the exhaust gas from the water-cooled low-temperature section is connected to the cold-side inlet of the exhaust gas from the flue gas heater.
[0013] After cooling, the carbon black tail gas exchanges heat with the heat transfer medium water in the water-cooled high-temperature section. After cooling down again, the carbon black tail gas enters the water-cooled medium-temperature section to cool down using circulating water. Then it enters the wet desulfurization tower for desulfurization. After desulfurization, the carbon black tail gas enters the wet desulfurization tower to cool down and dehydrate using the depth of the cooling medium water.
[0014] Preferably, the flue gas heater uses hot water that has been heated by a water-cooled high-temperature section. The hot water first enters the flue gas heater and then enters the refrigeration unit. The cooling water produced by the refrigeration unit enters the water-cooled low-temperature section for heat exchange.
[0015] After cooling, the carbon black exhaust gas exchanges heat with the heat transfer medium water in the water-cooled high-temperature section. The heat transfer medium water enters the refrigeration unit, where the heat of the heat transfer medium water is used to produce cold water. After cooling again, the carbon black exhaust gas enters the water-cooled medium-temperature section.
[0016] Preferably, the water-cooled low-temperature section is connected to a condensate treatment module.
[0017] Preferably, the refrigerant water produced by the refrigeration unit is lithium bromide chilled water, and the high-temperature lithium bromide water flowing out of the refrigeration unit enters the water-cooled high-temperature section.
[0018] Deep cooling with chilled water ensures more thorough dehydration. The heat from the hot water used for refrigeration is provided by the high-temperature carbon black tail gas, fully recovering the waste heat from the carbon black tail gas. Preheating the dehydrated, low-temperature carbon black tail gas with hot water allows for deeper extraction of heat from the original carbon black tail gas, reducing the amount of circulating water used.
[0019] Preferably, the material of the high-temperature water-cooled section is a combination of metal and non-metal, the material of the medium-temperature water-cooled section is non-metal, and the material of the low-temperature water-cooled section is non-metal.
[0020] After cooling, the carbon black tail gas exchanges heat with the hot water through a metal + non-metal heat exchanger. The hot water enters the refrigeration unit, where the heat of the hot water is used to produce cold water. After cooling again, the carbon black tail gas enters the non-metal heat exchanger to be cooled by circulating water. Then it enters the desulfurization tower for desulfurization. After desulfurization, the carbon black tail gas enters the non-metal heat exchanger to be cooled and dehydrated by the cold water.
[0021] Preferably, the flue gas heater is made of a non-metallic material.
[0022] The low-temperature carbon black tail gas after cooling and dehydration is heated by hot water using a non-metallic heat exchanger to maintain the system's heat balance and reduce the risk of corrosion of the metal GGH heat exchanger.
[0023] Preferably, the cooling water for the water-cooled intermediate temperature section is supplied by a cooling tower, enabling the water-cooled intermediate temperature section to utilize circulating water for cooling.
[0024] The beneficial effects of this utility model are as follows:
[0025] This utility model describes a waste heat recovery system for carbon black tail gas that integrates dehydration, desulfurization, and purification. After multi-stage cooling via a gas turbine generator (GGH), a water-cooled high-temperature section, a medium-temperature section, and a low-temperature section, and following a wet desulfurization process, the system achieves dehydration and desulfurization. The clean carbon black tail gas, after dehydration and desulfurization, is heated to approximately 160°C by a flue gas heater and GGH before entering a gas turbine for combustion and power generation. This system achieves flexible control, energy saving and emission reduction, and convenient maintenance. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of the waste heat recovery system for carbon black tail gas that integrates dehydration, desulfurization and purification.
[0027] In the diagram: 1. GGH heat exchanger; 2. Water-cooled high-temperature section; 3. Water-cooled medium-temperature section; 4. Wet desulfurization tower; 5. Water-cooled low-temperature section; 6. Refrigeration unit; 7. Flue gas heater; 8. Condensate treatment module. Detailed Implementation
[0028] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.
[0029] Example 1
[0030] like Figure 1 As shown in the figure, this embodiment discloses a waste heat recovery system for carbon black tail gas that integrates dehydration, desulfurization and purification, and is applied to a gas turbine. It includes a GGH heat exchanger 1, a water-cooled high-temperature section 2, a water-cooled medium-temperature section 3, a wet desulfurization tower 4, a water-cooled low-temperature section 5 and a flue gas heater 7. High-temperature, wet-saturated carbon black exhaust gas enters the system. The hot-side outlet of the exhaust gas from GGH heat exchanger 1 is connected to the hot-side inlet of the exhaust gas from water-cooled high-temperature section 2. The hot-side outlet of the exhaust gas from water-cooled high-temperature section 2 is connected to the hot-side inlet of the exhaust gas from water-cooled medium-temperature section 3. The hot-side outlet of the exhaust gas from water-cooled medium-temperature section 3 is connected to the gas inlet of wet desulfurization tower 4. The outlet of wet desulfurization tower 4 is connected to the hot-side inlet of the exhaust gas from water-cooled low-temperature section 5. The hot-side outlet of the exhaust gas from water-cooled low-temperature section 5 is connected to the cold-side inlet of the exhaust gas from flue gas heater 7. The condensate enters the condensate treatment module 8. The cold-side outlet of the exhaust gas from flue gas heater 7 is connected to the cold-side inlet of the exhaust gas from GGH heat exchanger 1. After heating, the exhaust gas enters the gas turbine. The hot water heated by water-cooled high-temperature section 2 first enters the flue gas heater 7 and then enters the refrigeration unit 6. The produced chilled water enters the water-cooled low-temperature section. The water-cooled medium-temperature section 3 is supplied by the cooling tower.
[0031] This waste heat recovery system for carbon black tail gas, integrating dehydration, desulfurization, and purification, cools the gas to approximately 25°C and reduces its moisture content to below 5% after multi-stage cooling via GGH heat exchanger 1, water-cooled high-temperature section 2, water-cooled medium-temperature section 3, and water-cooled low-temperature section 5. Through wet desulfurization, the sulfur content can be reduced to below 10 mg / m³, achieving the goal of dehydration and desulfurization. The clean carbon black tail gas after dehydration and desulfurization is then heated to approximately 160°C via flue gas heater 7 and GGH heat exchanger 1 before entering the gas turbine for combustion and power generation. By dehydrating and heating the gas before proceeding to the next process, energy waste caused by increasing the gas temperature is reduced, achieving energy conservation. Wet desulfurization reduces corrosive components in the tail gas, lowering the risk of leaks due to corrosion and reducing the need for subsequent environmental protection measures for waste gas treatment, thus achieving emission reduction.
[0032] The flue gas heater 7 is made of non-metallic material. It uses high-temperature water to preheat the dehydrated and desulfurized carbon black tail gas, thereby increasing the temperature of the carbon black tail gas and extracting heat from the original carbon black tail gas as much as possible.
[0033] After dehydration and desulfurization, the carbon black tail gas is heated once by the flue gas heater 7 before entering the GGH heat exchanger 1 to exchange heat with the original high-temperature tail gas. This increases the minimum wall temperature of the GGH heat exchanger 1 and reduces the risk of corrosion. The GGH heat exchanger 1 can be made into a duplex steel plate heat exchanger.
[0034] A wet desulfurization tower 4 is designed between the water-cooled medium-temperature section 3 and the water-cooled low-temperature section 5 to desulfurize the cooled carbon black tail gas. This not only reduces the sulfur content in the tail gas but also reduces the operating load of the desulfurization tower.
[0035] After dehydration and desulfurization, the carbon black tail gas is heated twice by the flue gas heater 7 and the GGH heat exchanger 1, and then directly enters the gas turbine for combustion and power generation.
[0036] In summary, the design is reasonable, which can not only dehydrate and desulfurize, recover a large amount of water in the carbon black tail gas, reduce the corrosive components in the tail gas, and reduce the exhaust gas generated after tail gas combustion, but also increase the temperature of the purified tail gas by using the waste heat of the original tail gas to heat the purified tail gas, which facilitates the operation of the gas turbine.
[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A waste heat recovery system integrating dehydration, desulfurization, and purification of carbon black tail gas, characterized in that: The system includes a GGH heat exchanger (1), a multi-stage cooling device, a wet desulfurization tower (4), and a flue gas heater (7). The hot-side outlet of the tail gas of the GGH heat exchanger (1) is connected to the hot-side inlet of the tail gas of the multi-stage cooling device. The hot-side outlets of each stage of the tail gas of the multi-stage cooling device are connected to the hot-side inlets of each stage in sequence. The hot-side outlet of the tail gas of the multi-stage cooling device is connected to the cold-side inlet of the tail gas of the flue gas heater (7). The cold-side outlet of the tail gas of the flue gas heater (7) is connected to the cold-side inlet of the tail gas of the GGH heat exchanger (1). The wet desulfurization tower (4) is connected inside the multi-stage cooling device. The hot-side outlet of the tail gas of the previous stage is connected to the gas inlet of the wet desulfurization tower (4). The outlet of the wet desulfurization tower (4) is connected to the hot-side inlet of the tail gas of this stage. The hot water heated by the multi-stage cooling device first enters the flue gas heater (7) and then enters the refrigeration unit (6). The chilled water produced by the refrigeration unit (6) enters the multi-stage cooling device.
2. The waste heat recovery system for carbon black tail gas integrating dehydration, desulfurization, and purification according to claim 1, characterized in that: The multi-stage cooling equipment includes a water-cooled high-temperature section (2), a water-cooled medium-temperature section (3), and a water-cooled low-temperature section (5). The hot-side outlet of the tail gas of the water-cooled high-temperature section (2) is connected to the hot-side inlet of the tail gas of the water-cooled medium-temperature section (3). The hot-side outlet of the tail gas of the water-cooled medium-temperature section (3) is connected to the gas inlet of the wet desulfurization tower (4). The outlet of the wet desulfurization tower (4) is connected to the hot-side inlet of the tail gas of the water-cooled low-temperature section (5). The hot-side outlet of the tail gas of the water-cooled low-temperature section (5) is connected to the cold-side inlet of the tail gas of the flue gas heater (7).
3. The waste heat recovery system for carbon black tail gas integrating dehydration, desulfurization, and purification according to claim 2, characterized in that: The flue gas heater (7) uses hot water heated by the water-cooled high-temperature section (2). The hot water heated by the water-cooled high-temperature section (2) first enters the flue gas heater (7) and then enters the refrigeration unit (6). The chilled water produced by the refrigeration unit (6) enters the water-cooled low-temperature section (5) for heat exchange.
4. The waste heat recovery system for carbon black tail gas integrating dehydration, desulfurization, and purification according to claim 3, characterized in that: The water-cooled low-temperature section (5) is connected to a condensate treatment module (8).
5. The waste heat recovery system for carbon black tail gas integrating dehydration, desulfurization, and purification according to claim 3, characterized in that: The chilled water produced by the refrigeration unit (6) is lithium bromide chilled water, and the high-temperature lithium bromide water flowing out of the refrigeration unit (6) enters the water-cooled high-temperature section (2).
6. The waste heat recovery system for carbon black tail gas integrating dehydration, desulfurization, and purification according to claim 2, characterized in that: The water-cooled high-temperature section (2) is made of a combination of metal and non-metal materials, the water-cooled medium-temperature section (3) is made of a non-metal material, and the water-cooled low-temperature section (5) is made of a non-metal material.
7. The waste heat recovery system for carbon black tail gas integrating dehydration, desulfurization, and purification according to claim 1, characterized in that: The flue gas heater (7) is made of non-metallic material.
8. The waste heat recovery system for carbon black tail gas integrating dehydration, desulfurization, and purification according to claim 3, characterized in that: The cooling water for the water-cooled intermediate temperature section (3) is supplied by a cooling tower.