CN-116899377-B - Novel carbon dioxide absorbent and trapping system

Abstract

The invention relates to the technical field of carbon dioxide absorption, and particularly discloses a novel carbon dioxide absorbent and a trapping system, wherein the absorbent comprises 2-amino-2-methyl-1-propanol AMP, an activating agent and a solvent, the trapping system comprises an absorption tower, a solid-liquid separator and a desorption tower, the liquid inlet end of the solid-liquid separator is connected with a liquid outlet of the absorption tower through a conveying pipeline, and the rich phase inlet end of the desorption tower is connected with a thick slurry discharge end through a conveying pipeline. The CO 2 absorbent can efficiently realize the absorption and desorption of CO 2 , is convenient for the recycling of the CO 2 absorbent, can greatly reduce the regeneration volume of the CO 2 absorbent by absorbing and solidifying the CO 2 and separating and desorbing and regenerating the solid-liquid two phases through the CO 2 absorbent, further reduces the regeneration energy consumption, can be converted into a liquid phase after the CO 2 rich-phase slurry is desorbed, and is mixed with the lean liquid of the CO 2 absorbent separated by the solid-liquid separator to be conveyed into the absorption tower again for recycling.

Inventors

• LU SHIJIAN
• ZHU JUSHENG
• NI ZHONGHAI
• CAO JINGPEI
• YAN XINLONG
• ZHU JIAMEI
• GUI XIAHUI
• WANG QUANDE
• LIU ZIWU
• WANG RUIYU
• Xi xian
• CHEN SIMING
• GUO ZHENKUN
• WEI FU
• LIU LING
• KANG GUOJUN
• SUN WENTAN
• NIU HAO
• YANG FEI
• YANG SEN
• Gong Qianbo

Assignees

• 中国矿业大学
• 北京牡丹联友环保科技股份有限公司
• 江苏碳捕集环保研究院有限公司

Dates

Publication Date

20260512

Application Date

20230721

Claims (6)

1. 1. A carbon dioxide absorbent is characterized by comprising 2-amino-2-methyl-1-propanol AMP, an activating agent and a solvent, wherein the activating agent is pentamethyl diethylene triamine PMDETA, and the solvent is one or a combination of more of ethanol, propanol, polyethylene glycol PEG200 and 1, 4-butanediol BDO; the AMP content accounts for 60% of the total volume of the absorbent, and the activator and solvent content accounts for 40% of the total volume of the absorbent; wherein the volume ratio of the activator to the solvent is 1 (2-7).
2. 2. The carbon dioxide absorbent of claim 1, wherein the activator is PMDETA, the solvent is propanol, and the volume ratio of PMDETA to propanol is 1:2.
3. 3. A carbon dioxide capturing system employing the carbon dioxide absorbent according to any one of claims 1 to 2, characterized in that the capturing system comprises: The device comprises an absorption tower (1), wherein an air inlet (11), an air outlet (12), a liquid inlet (13) and a liquid outlet (14) are arranged on the absorption tower (1); the solid-liquid separator (3), the liquid inlet end of the solid-liquid separator (3) is connected with the liquid outlet (14) of the absorption tower (1) through a conveying pipeline, and the conveying pipeline is connected with a conveying pump (2), the solid-liquid separator (3) is provided with a liquid discharge end (31) and a thick slurry discharge end (32); The device comprises a desorption tower (6), wherein a reflux end (61), a rich phase inlet end (62) and an exhaust end (63) are arranged on the desorption tower (6), the rich phase inlet end (62) is connected with a thick slurry exhaust end (32) through a conveying pipeline, the conveying pipeline is connected with a heater (4) and a heat exchanger (5), the reflux end (61) is communicated with a liquid inlet (13) of the absorption tower through a reflux pipe (9), the reflux pipe (9) is communicated with the heat exchanger (5) and is connected with a liquid exhaust end (31) of a solid-liquid separator, and the reflux pipe (9) is connected with a cooler (91); Wherein, exhaust end (63) top cooperation of desorber is provided with heat recovery mechanism (10), heat recovery mechanism (10) include: the exhaust pipe (102), the exhaust pipe (102) is fixedly connected to the exhaust end (63); the heat exchange tube (103), the heat exchange tube (103) is made of a heat conduction metal material, and the heat exchange tube (103) is connected to the exhaust pipe (102); The heat-insulating shell (101), the heat-insulating shell (101) is fixedly sleeved outside the heat exchange tube (103), heat exchange liquid (104) is filled between the heat-insulating shell (101) and the heat exchange tube (103), a liquid level sensor (123) and a temperature sensor (125) are arranged on the inner wall of the heat-insulating shell (101), a filling tube (126) and a liquid discharge tube (127) are connected to the outer wall of the heat-insulating shell (101), the filling tube (126) is communicated with a water supply end, the liquid discharge tube (127) is communicated with a liquid storage tank, and control valves are arranged on the filling tube (126) and the liquid discharge tube (127); The heat exchange tube (103) is internally provided with a heat exchange hollow plate (105), two ends of the heat exchange hollow plate (105) are symmetrically connected with two connecting plates (106), the connecting plates (106) are connected to the outer wall of the heat exchange tube (103) and are immersed in the heat exchange liquid (104), a rotating shaft (108) which is rotatably supported on the two connecting plates (106) is arranged in a cavity of the heat exchange hollow plate (105), the side wall of the rotating shaft (108) positioned in the heat exchange hollow plate (105) is connected with blades (109), the outer end of the rotating shaft (108) is connected with stirring sheets (110) positioned in the heat exchange liquid (104), and a plurality of groups of through holes (107) are respectively arranged on the upper surface and the lower surface of the heat exchange hollow plate (105) in a penetrating mode.
4. 4. A carbon dioxide capturing system according to claim 3, characterized in that the desorber (6) is provided with a flash evaporator (7) and a compressor (8) in cooperation, the flash evaporator (7) being connected with the compressor (8) and supplying heat to the desorber (6).
5. 5. The carbon dioxide capturing system according to claim 3, wherein a partition plate (111) is arranged on the upper side of the heat exchange hollow plate (105) in the heat exchange tube (103), a plurality of ventilation holes (112) are formed in the partition plate (111) in a penetrating mode, a sliding rod (113) is vertically connected to the partition plate (111) in a sliding mode, a cover plate (114) is connected to the top end of the sliding rod (113), the cover plate (114) is buckled on the partition plate (111) and can seal the ventilation holes (112), a loading plate (115) is connected to the bottom end of the sliding rod (113), and a loading block (116) is connected to the lower end of the loading plate (115).
6. 6. The carbon dioxide capturing system according to claim 5, wherein two hollow tubes (117) are horizontally and slidably connected to two side walls of the heat exchange tube (103), the outer ends of the hollow tubes (117) can be slidably inserted into the heat exchange liquid (104), and a limiting ring (122) is connected to the side wall of one end of the hollow tube (117) located in the heat exchange liquid (104); A linkage ring (118) is correspondingly arranged below the weight bearing block (116), and the linkage ring (118) is fixedly connected with the inner wall of the heat exchange tube (103) through a fixed rod, a cavity (119) is arranged in the linkage ring (118), a linkage rope (121) is horizontally arranged through the cavity (119) in a penetrating manner, and two ends of the linkage rope (121) are fixedly connected with one end of the inner side of the hollow tube (117) respectively; The load block (116) is connected with a pull rope (120), and the lower end of the pull rope (120) is connected with the center of the linkage rope (121).

Description

Novel carbon dioxide absorbent and trapping system Technical Field The invention relates to the technical field of carbon dioxide absorption, in particular to a novel carbon dioxide absorbent and a trapping system. Background As global CO 2 emissions increase, the global warming and climate change effects are exacerbated. To cope with this problem, the technology of capturing, utilizing and sequestering CO 2 (CCUS) is explored at home and abroad to reduce CO 2 emissions while meeting energy requirements. CO 2 is the process of separating and collecting CO 2 from the exhaust gas discharged from emission sources (such as power plants, steel plants, oil refineries and the like), and is the basis and premise of the development of CCUS technology, and the trapping mode of CO 2 mainly comprises chemical absorption, physical absorption and membrane separation. Among them, the chemical absorption is to contact CO 2 with a chemical absorbent and absorb CO 2 into the absorbent, and is a method widely used for capturing CO 2 at present. At present, an organic amine solution (such as ethanolamine) is a main absorbent for capturing CO 2, the organic amine solution absorbs CO 2 to form CO 2 rich solution, then the CO 2 rich solution enters a resolving tower to be heated and decomposed to release CO 2, a CO 2 lean solution is obtained, and the CO 2 is absorbed again in a circulating way, so that released CO 2 is collected and utilized. However, when the organic amine solution is used as the CO 2 absorbent, the saturated phase solution is formed after the organic amine solution absorbs CO 2, and the saturated phase solution needs to be regenerated completely, so that the regeneration energy consumption of the organic amine solution is high, the treatment cost of the CO 2 capturing system is further increased, and the environment-friendly production requirement is difficult to meet. Disclosure of Invention The invention aims to provide a novel carbon dioxide absorbent and a novel carbon dioxide capturing system, which are used for solving the problems of high energy consumption and high cost in the CO 2 absorption process. The technical scheme is that the novel carbon dioxide absorbent comprises 2-amino-2-methyl-1-propanol AMP, an activating agent and a solvent; the AMP content accounts for 60% of the total volume of the absorbent, and the activator and solvent content accounts for 40% of the total volume of the absorbent; wherein the volume ratio of the activator to the solvent is 1 (2-7). Preferably, the activator is pentamethyldiethylenetriamine PMDETA. Preferably, the solvent is one or more combinations of ethanol, propanol, polyethylene glycol PEG200, 1, 4-butanediol BDO. Preferably, the activator is PMDETA, the solvent is propanol, and the volume ratio of PMDETA to propanol is 1:2. The invention also discloses a carbon dioxide trapping system, which comprises: the absorption tower is provided with an air inlet, an air outlet, a liquid inlet and a liquid outlet; the liquid inlet end of the solid-liquid separator is connected with the liquid outlet of the absorption tower through a conveying pipeline, and the conveying pipeline is connected with a conveying pump; The device comprises a desorption tower, wherein a reflux end, a rich phase inlet end and an exhaust end are arranged on the desorption tower, the rich phase inlet end is connected with a thick slurry exhaust end through a conveying pipeline, the conveying pipeline is connected with a heater and a heat exchanger, the reflux end is communicated with a liquid inlet of the absorption tower through a reflux pipe, the reflux pipe is communicated with the heat exchanger and is connected with a liquid exhaust end of a solid-liquid separator, and the reflux pipe is connected with a cooler. Preferably, the desorption tower is provided with a flash evaporator and a compressor in a matched mode, and the flash evaporator is connected with the compressor and supplies heat for the desorption tower. Preferably, the exhaust end top of the desorption tower is provided with a heat recovery mechanism in a matched manner, and the heat recovery mechanism comprises: the exhaust pipe is fixedly connected to the exhaust end; the heat exchange tube is made of a heat conduction metal material and is connected to the exhaust pipe; The heat-insulating shell is fixedly sleeved outside the heat exchange tube, heat exchange liquid is filled between the heat-insulating shell and the heat exchange tube, a liquid level sensor and a temperature sensor are arranged on the inner wall of the heat-insulating shell, the outer wall of the heat-insulating shell is connected with a filling pipe and a liquid discharge pipe, the filling pipe is communicated with a water supply end, the liquid discharge pipe is communicated with a liquid storage tank, and control valves are arranged on the filling pipe and the liquid discharge pipe. The heat exchange hollow plate is characterized in that a heat exchange ho