Rich-phase regeneration device suitable for phase change absorbent
Through the device combining a hollow fiber membrane assembly and a flash tank, the membrane flash evaporator is used to reduce the phase-rich viscosity and heat the regenerated absorbent, which solves the problem of mass transfer limitation in traditional tower equipment, and realizes the low-energy regeneration of the phase change absorbent and the stable operation of the equipment.
Patent Information
- Application Number
- CN202422271759.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-18
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-09-18
AI Technical Summary
The phase-rich phase of the phase-change absorber is limited in traditional tower equipment, resulting in low desorption rate and easy to blockage, increasing equipment cost and maintenance difficulty.
The device using a combination of hollow fiber membrane module and flash tank is used to reduce the phase-rich viscosity through the membrane flash evaporation process, and the semi-regeneration absorbent is heated by the steam output from the flash tank, and the multi-layer filler layer is combined to improve the mass transfer efficiency and regeneration efficiency.
The low-energy regeneration of phase change absorbers is achieved, the problem of mass transfer is solved, the risk of equipment blockage is reduced, and the regeneration efficiency and equipment life are improved.
Smart Images
Figure CN223159080U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of carbon capture technology, in particular to a rich-phase regeneration device suitable for phase-change absorbents. Background Technique
[0002] The chemical absorption method has the advantages of high decarbonization efficiency and good selectivity, and is the most widely used post-combustion CO2 removal technology at present. The core of the chemical absorption method is the formulation development of organic amine solvents. The phase-change absorbent forms rich and poor phases after absorption, and has the advantages of low regeneration energy consumption and low corrosion compared with traditional composite amine absorbents, and is currently a research hotspot.
[0003] In industry, traditional tower equipment is generally used to regenerate and separate absorbents. Its process technology is mature and the operation is stable. The CO2 in the rich phase is separated by steam heating, and the steam temperature is generally not higher than 130°C.
[0004] The phase-change absorbent forms rich and poor phases after CO2 absorption, reducing the regeneration energy consumption. However, the rich phase entering the regeneration tower generally has a high viscosity, which limits the mass transfer of the rich phase in traditional tower desorption equipment and affects the desorption rate. At the same time, the high viscosity of the absorbent is likely to cause blockage and other problems between pipelines, and will also damage parts such as pumps, affecting the service life and increasing the equipment cost. Summary of the Invention
[0005] The purpose of the utility model is to solve the problems in the prior art, and propose a rich-phase regeneration device suitable for phase-change absorbents, which can solve the problems such as limited mass transfer of the rich phase of the phase-change absorbent in traditional tower equipment, realize the low-energy regeneration of the phase-change absorbent, and has industrial application prospects.
[0006] To achieve the above purpose, the utility model proposes a rich-phase regeneration device suitable for phase-change absorbents, including a tank body, a hollow fiber membrane module, a flash tank I, a flash tank II and several packing layers I. The hollow fiber membrane module is arranged inside the upper end of the tank body. The hollow fiber membrane module is provided with a rich liquid inlet, a post-pre-regeneration liquid outlet and a CO2 gas outlet. The post-pre-regeneration liquid outlet is communicated with the feed inlet of the flash tank I. The discharge outlet of the flash tank I is communicated with the tank body. The steam output by the flash tank I is used to heat the semi-regenerated absorbent in the tank body. The lower end of the tank body is provided with an absorbent lean liquid collection chamber. The steam outlet and the feed inlet of the flash tank II are communicated with the absorbent lean liquid collection chamber. The absorbent lean liquid output from the discharge outlet of the flash tank II is sent to the absorption tower. The middle of the tank body is internally provided with packing layers I arranged at intervals.
[0007] Preferably, the steam output from the steam outlet of the flash tank I exchanges heat with the gas in the tank body through a heat exchanger I, and the gas after heat exchange enters the tank body to heat the semi-regenerated absorbent passing through the corresponding packing layer I.
[0008] Preferably, a steam inlet is provided on the lean absorbent collection chamber.
[0009] Preferably, a packing layer II is provided between every two adjacent packing layers I in the tank body, and the packing layer II is a desorption catalyst packing.
[0010] Preferably, an upper end of the tank body is provided with a mixed gas outlet, and the mixed gas outlet is communicated with a gas-liquid separator through a heat exchanger II.
[0011] Preferably, the butting part of the hollow fiber membrane module is sealed with silicone rubber.
[0012] Advantages of the present utility model: By providing a rich liquid inlet, a post-pre-regeneration liquid outlet and a CO2 gas outlet on the hollow fiber membrane module of the present utility model, the post-pre-regeneration liquid outlet is communicated with the feed inlet of the flash tank I, the discharge outlet of the flash tank I is communicated with the tank body, a lean absorbent collection chamber is provided at the lower end of the tank body, the steam outlet and the feed inlet of the flash tank II are communicated with the lean absorbent collection chamber, the steam output by the flash tank I is used to heat the semi-regenerated absorbent in the tank body, and the lean absorbent output from the discharge outlet of the flash tank II is fed into the absorption tower. An intermittently arranged packing layer I is provided in the middle of the tank body. Compared with the prior art, problems such as mass transfer limitation of the rich phase of the phase change absorbent in traditional tower equipment can be solved, low-energy consumption regeneration of the phase change absorbent can be realized, and it has an industrial application prospect.
[0013] The features and advantages of the present utility model will be described in detail through embodiments in conjunction with the drawings. Description of the Drawings
[0014] Figure 1 is a schematic structural diagram of a device suitable for regenerating the rich phase of a phase change absorbent according to the present utility model.
[0015] In the figure: 1 - tank body, 2 - hollow fiber membrane module, 3 - flash tank I, 4 - flash tank II, 5 - packing layer I, 6 - heat exchanger I, 7 - lean absorbent collection chamber, 8 - steam inlet, 9 - packing layer II, 10 - mixed gas outlet, 11 - heat exchanger II, 12 - gas-liquid separator, 21 - rich liquid inlet, 22 - post-pre-regeneration liquid outlet, 23 - CO2 gas outlet. Detailed Embodiments
[0016] Refer to Figure 1, the utility model relates to a phase change absorbent rich phase regeneration device, which includes a tank body 1, a hollow fiber membrane module 2, a flash tank I 3, a flash tank II 4 and a plurality of packing layers I 5. The hollow fiber membrane module 2 is arranged inside the upper end of the tank body 1. The hollow fiber membrane module 2 is provided with a rich liquid inlet 21, a post-pre-regeneration liquid outlet 22 and a CO2 gas outlet 23. The post-pre-regeneration liquid outlet 22 is communicated with the feed inlet of the flash tank I 3. The discharge outlet of the flash tank I 3 is communicated with the tank body 1. The steam output by the flash tank I 3 is used to heat the semi-regenerated absorbent inside the tank body 1. The lower end of the tank body 1 is provided with an absorbent lean liquid collection chamber 7. The steam outlet and the feed inlet of the flash tank II 4 are communicated with the absorbent lean liquid collection chamber 7. The absorbent lean liquid output from the discharge outlet of the flash tank II 4 is sent to an absorption tower. Inside the tank body 1, the packing layers I 5 are arranged at intervals in the middle.
[0017] The steam output from the steam outlet of the flash tank I 3 exchanges heat with the gas inside the tank body 1 through a heat exchanger I 6, and the gas after heat exchange enters the tank body 1 to heat the semi-regenerated absorbent passing through the corresponding packing layer I 5.
[0018] The absorbent lean liquid collection chamber 7 is provided with a steam inlet 8.
[0019] Inside the tank body 1, packing layers II 9 are arranged between adjacent two packing layers I 5, and the packing layers II 9 are desorption catalyst packings.
[0020] The upper end of the tank body 1 is provided with a mixed gas outlet 10, and the mixed gas outlet 10 is communicated with a gas-liquid separator 12 through a heat exchanger II 11.
[0021] The butting part of the hollow fiber membrane module 2 is sealed with silicone rubber.
[0022] The working process of the utility model:
[0023] In the working process of a phase change absorbent rich-phase regeneration device of the utility model, the absorbent rich liquid is pumped from the phase separation tank into the hollow fiber membrane module 2 by a pump. The outer side is the desorbed gas phase. To ensure airtightness, silicone rubber is used to seal the mating part of the membrane module. The absorbent rich liquid is preheated before entering the membrane module, and the heating temperature does not exceed 80 °C. The viscosity of the absorbent rich liquid separated by the membrane module is relatively low, and the mass transfer effect in the desorption tower is improved. After pretreatment by the membrane module, it enters the flash tank I3 for flashing. The pretreated absorbent rich liquid entering the flash tower will instantaneously vaporize in large quantities under the condition of reduced pressure, generating secondary steam to exchange heat with the gas in the tank body 1 through the heat exchanger I6. The heated gas enters the tank body 1 to heat the absorbent rich liquid passing through the corresponding packing layer I5, and after heat exchange, it is pumped back to the bottom of the desorption tower to be regenerated by the direct steam method. In addition to setting the packing layer I5 in the desorption tower to increase mass transfer, two packing layers II9 are also set to improve the regeneration efficiency of the rich liquid during its residence time in the desorption tower. The lean liquid formed after regeneration accumulates in the absorbent lean liquid collection chamber 7, with a high temperature. The heat is recovered through the flash tank II4, and the generated steam can be reused for the regeneration of the absorbent rich liquid in the desorption tower, reducing the steam consumption for regeneration, thereby realizing the low-energy consumption regeneration of the phase change absorbent rich liquid.
[0024] Since the membrane flash process can effectively reduce the viscosity of the rich phase and lower the regeneration temperature, and is suitable for the regeneration of the phase change absorbent rich phase. However, the lean liquid obtained by a single separation may have the problem of too high CO2 loading, resulting in a low absorbent circulation load and affecting the capture efficiency. The utility model uses the membrane flash process to replace the reboiler part of the traditional tower-type desorption equipment. On the basis of the membrane flash process, the steam output from the flash tank I3 is also used to heat the semi-regenerated absorbent in the tank body 1. The steam outlet and the feed inlet of the flash tank II4 are also connected to the absorbent lean liquid collection chamber 7. The absorbent lean liquid output from the discharge port of the flash tank II4 is sent to the absorption tower, solving the problems such as mass transfer limitation of the phase change absorbent rich phase in the traditional tower-type equipment, and realizing the low-energy consumption regeneration of the phase change absorbent, having industrial application prospects.
[0025] The above embodiments are illustrative of the utility model, not limiting of the utility model. Any scheme obtained by simply transforming the utility model belongs to the protection scope of the utility model.
Claims
1. A phase change absorbent rich phase regeneration device, characterized in that: It includes a tank body (1), a hollow fiber membrane module (2), a flash tank I (3), a flash tank II (4) and a number of packing layers I (5). Inside the upper end of the tank body (1), there is a hollow fiber membrane module (2). The hollow fiber membrane module (2) is provided with a rich liquid inlet (21), a post-pre-regeneration liquid outlet (22) and a CO2 gas outlet (23). The post-pre-regeneration liquid outlet (22) is communicated with the feed inlet of the flash tank I (3). The discharge outlet of the flash tank I (3) is communicated with the tank body (1). The steam output by the flash tank I (3) is used to heat the semi-regenerated absorbent inside the tank body (1). At the lower end of the tank body (1), there is an absorbent lean liquid collection chamber (7). The steam outlet and the feed inlet of the flash tank II (4) are communicated with the absorbent lean liquid collection chamber (7). The absorbent lean liquid output from the discharge outlet of the flash tank II (4) is sent to an absorption tower. Inside the middle of the tank body (1), there are packing layers I (5) arranged at intervals.
2. The regenerating device for the rich phase of the phase change absorbent according to claim 1, wherein: The steam output from the steam outlet of the flash tank I (3) exchanges heat with the gas inside the tank body (1) through a heat exchanger I (6), and the gas after heat exchange enters the tank body (1) to heat the semi-regenerated absorbent passing through the corresponding packing layer I (5).
3. A phase change absorbent rich phase regeneration device according to claim 1, characterized in that: There is a steam inlet (8) on the absorbent lean liquid collection chamber (7).
4. The regenerating device for the rich phase of the phase change absorbent according to claim 1, wherein: Inside the tank body (1), there are packing layers II (9) between adjacent two packing layers I (5), and the packing layers II (9) are desorption catalyst packings.
5. The regenerating device for rich phase of phase change absorbent according to claim 1, wherein: At the upper end of the tank body (1), there is a mixed gas outlet (10), and the mixed gas outlet (10) is communicated with a gas-liquid separator (12) through a heat exchanger II (11).
6. A phase change absorbent rich phase regeneration device according to any one of claims 1 to 5, characterized in that: The mating part of the hollow fiber membrane module (2) is sealed with silicone rubber.