耦合热泵的FCC脱硫湿烟气脱白净化及余热回收系统设计分析

doi:10.16085/j.issn.1000-6613.2021-0008

摘要/Abstract

摘要：

根据某80万吨/年催化再生烟气参数，结合低温浆液喷淋与热泵技术，设计了耦合热泵的FCC脱硫湿烟气脱白净化系统，建立了烟气-脱硫液-热泵的余热回收路线。使用Aspen Plus与热力学模型进行了流程模拟与分析。结果表明，低温环境下，系统具有良好的烟气脱白能力。低温浆液喷淋强化了脱硫塔的脱硫除尘性能，同时回收了烟气中的水分，设计工况下，系统回收水量为1.47t/h。本系统无需额外热源，烟气热量驱动可实现脱白。灵敏度分析表明，系统在烟气流量82%～124%范围内都能消除湿烟羽。系统具备余热回收再利用能力，模拟结果显示，盈余热量1.87MW，投资回收期4.88年，经济优势显著。

关键词: 过程系统, 计算机模拟, 设计优化, 湿烟羽脱除, 节水减排, 余热回收

Abstract:

According to the parameters of an 8×10⁵t/a catalytic regenerated flue gas, combining with low-temperature slurry spray and heat pump technology, the FCC (fluid catalytic cracking) desulphurization wet flue gas wet plume elimination-purification system coupling heat pump was designed, and the heat recovery route of flue gas - slurry - heat pump was established. The process simulation and analysis were carried out using Aspen Plus and thermal model, the results showed that the system has a good ability of wet plume elimination in low temperature environment. Low temperature spraying enhances the desulfurization and dust removal performance of the desulfurizer,while promotes the recovery of water of flue gas. The recovered water of the system was 1.47t/h under the design condition. The flue gas could be dewhitened by its own heat drive without additional heat. The sensitivity analysis showed that the system could eliminate wet plume in the fluctuation range of volume flow from 82% to 124%. The new system could recover waste heat and make use of it. The surplus heat of the system was 1.87MW in simulation, the payback period of investment was 4.88 years, which reflected the good economic performance of the system. The system has certain reference significance for the FCC flue gas dewhitening transformation.

Key words: process systems, computer simulation, optimal design, wet plume elimination, water conservation and emission reduction, waste heat recovery

中图分类号:

TE99

宋峥元, 孙国刚, 祖泽辉, 王中原. 耦合热泵的FCC脱硫湿烟气脱白净化及余热回收系统设计分析[J]. 化工进展, 2021, 40(12): 6934-6940.

SONG Zhengyuan, SUN Guogang, ZU Zehui, WANG Zhongyuan. Design and analysis of FCC desulfurized wet flue gas plume elimination, purification and heat recovery system coupling with heat pump[J]. Chemical Industry and Engineering Progress, 2021, 40(12): 6934-6940.

图/表 13

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冷凝再热路线/℃	需热量/MW
冷凝再热路线/℃	冷凝	再热
120→44→102.1	2.25	1.87
120→42→90.8	2.81	1.56
120→40→80.7	3.31	1.29
120→38→71.5	3.76	1.05
120→36→63.4	4.18	0.85

冷凝再热路线/℃	需热量/MW
冷凝再热路线/℃	冷凝	再热
120→44→102.1	2.25	1.87
120→42→90.8	2.81	1.56
120→40→80.7	3.31	1.29
120→38→71.5	3.76	1.05
120→36→63.4	4.18	0.85

流股名称	质量流量/kg·h^-1	温度/℃	压力/kPa
脱硫塔入口烟气	109430	120	102.125
循环脱硫液	1060000	39	101.325
热泵工质（SOL1）	22000	40	5.630
热泵工质（SOL2）	22000	40	60.103
待加热水	60000	20	101.325

流股名称	质量流量/kg·h^-1	温度/℃	压力/kPa
脱硫塔入口烟气	109430	120	102.125
循环脱硫液	1060000	39	101.325
热泵工质（SOL1）	22000	40	5.630
热泵工质（SOL2）	22000	40	60.103
待加热水	60000	20	101.325

浆液温度/℃	脱硫塔出口烟气含水量/t·h^-1	系统回收水量/t·h^-1
38	4.04	1.71
39.5	4.28	1.47
40	4.52	1.22
42	5.06	0.68
44	5.65	0.09
46	6.31	—
48	7.02	—
50	7.81	—