Device and process for removing and recovering SO2 in industrial exhaust gas or tail gas
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An industrial flue gas and heat recovery device technology, applied in the field of flue gas tail gas treatment, can solve the problems of low heat energy recovery efficiency, increased energy consumption, large amount of absorption liquid, etc., to achieve enhanced heat transfer, reduced usage, and reduced energy consumption small effect
Inactive Publication Date: 2018-11-06
BEIJING UNIV OF CHEM TECH
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Problems solved by technology
[0004] At present, researchers have paid attention to the removal and recovery of sulfur dioxide, but few researchers have focused on energy consumption.
CN 105848757 A proposes a method for capturing SO 2 And the technological process of regeneration and recovery, in which the absorption and regeneration unit adopts traditional tower equipment, which is bulky. Due to the low mass transfer efficiency of tower equipment, in order to meet certain removal efficiency requirements, the amount of absorption liquid recycled in the system is large. As a result, a large amount of absorption liquid needs to be heated and regenerated, and the energy load of the system is relatively high; CN 105935540 A proposes a device for removing and recovering sulfur dioxide in the mixed gas, which can realize SO 2 high-efficiency removal and recovery, but the heat energy in the steam generated by the regeneration in this patent has not been effectively recovered and utilized, resulting in energy waste; CN 102049176 A proposes a flue gas desulfurization process flow through the high-gravity solvent circulation absorption method, This process only recycles part of the heat energy of the regenerated lean liquid through the lean-rich liquid heat exchanger, the heat energy recovery efficiency is low, and the heat energy of the steam at the top of the regeneration tower is not effectively recovered and utilized, and air or nitrogen is used as the stripping gas during regeneration. , added follow-up SO 2 The difficulty of separation, it is difficult to directly recover high-purity SO 2
[0005] on SO 2 In the process of removal and recovery, the absorbent is regenerated after desulfurization to produce SO 2 , the absorbent is recycled, and its consumption determines the energy load of the entire system. Both the regenerated steam and the lean absorption medium contain more heat. If they cannot be recycled effectively, energy will be wasted and energy consumption will increase.
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Embodiment 1
[0040] Use the above device and process to remove and recover sulfur dioxide in flue gas. Among them, the temperature of the No. 1 supergravity machine is controlled at 30-35℃, the supergravity level is 120, and the volume flow ratio of the rich amine liquid heated by the hot lean amine liquid and the rich amine liquid heated by the hot steam is 10:1-8:1. The regeneration temperature in the No. 2 supergravity machine is controlled at 105°C, the supergravity level is 150, the temperature of the reboiler is controlled at 120-130°C, the temperature of the condenser is controlled at 10-20°C, the amine liquid after the lean amine cooler The temperature is controlled at 30-35℃, and the volume flow ratio of the extracted liquid and the liquid flowing to the reboiler is 10:1-15:1.
[0041] Sampling and analysis at the gas outlet of No. 1 supergravity machine, SO 2 The concentration is 80mg / m 3 , Sampling and analysis at the gas outlet of the condenser, SO 2 The gas purity can reach 99.5%...
Embodiment 2
[0043] As described in Example 1, with other conditions unchanged, the temperature of the No. 1 supergravity machine was adjusted to 25-30°C. Sampling and analysis at the gas outlet of No. 1 supergravity machine, SO 2 The concentration is 80mg / m 3 , Sampling and analysis at the gas outlet of the condenser, SO 2 The gas purity can reach 99.5%.
Embodiment 3
[0045] As described in Example 1, with other conditions unchanged, the supergravity level of the No. 1 supergravity machine was adjusted to 200. Sampling and analysis at the gas outlet of No. 1 supergravity machine, SO 2 The concentration is 50mg / m 3 , Sampling and analysis at the gas outlet of the condenser, SO 2 The gas purity can reach 99.5%.
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Abstract
The invention discloses a device and process for removing and recovering sulfur dioxide in industrial exhaust gas or tail gas. The device comprises a booster fan, a supergravity machine I, an amine supplementing tank, an amine supplementing pump, an extraction pump, an amine-rich tank, an amine-rich delivery pump, a flow regulation valve 1, a flow regulation valve 2, a flow regulation valve 3, a lean and rich amine heat exchanger, a heat recovery device, a supergravity machine 2, a flow regulation valve 4, a liquid buffer storage tank, a reboiler, a condenser, a lean amine heat exchanger, an amine liquid purification system and a rich amine heater which are connected in a certain way. By adopting the device and process, removal, regeneration and recovery of sulfur dioxide in the industrialexhaust gas or tail gas can be achieved, and the device and process have the advantages of saving space and being small in absorbent circulation volume, high in desulfurization efficiency, high in energy utilization rate, low in energy consumption, safe, environmentally friendly and the like and can be applied to the field of desulfurization of exhaust gas or tail gas produced in various industrial processes.
Description
Technical field [0001] The invention relates to a method for removing and recovering SO from industrial flue gas or tail gas 2 The device and process have the advantages of high energy utilization rate, low energy consumption, and high removal efficiency, and are suitable for flue gas tail gas treatment in industrial processes such as chemical industry, metallurgy, steel, and thermal power. Background technique [0002] Sulfur Dioxide (SO 2 ) Is a colorless gas with a strong pungent odor, which is mainly produced from the consumption of resources such as coal, petroleum, natural gas, metal minerals and the exhaust gas of industrial processes such as coal-fired industrial boilers. On the one hand, it is one of the main air pollutants and one of the main causes of major environmental problems such as haze and acid rain in recent years. It has harmed the health of humans, animals and plants, and has restricted the healthy development of my country's economy and society. On the other...
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