CN109432823B - Temperature control system suitable for simulated moving bed and temperature control method of simulated moving bed - Google Patents
Temperature control system suitable for simulated moving bed and temperature control method of simulated moving bed Download PDFInfo
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- CN109432823B CN109432823B CN201811362625.7A CN201811362625A CN109432823B CN 109432823 B CN109432823 B CN 109432823B CN 201811362625 A CN201811362625 A CN 201811362625A CN 109432823 B CN109432823 B CN 109432823B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D15/00—Separating processes involving the treatment of liquids with solid sorbents; Apparatus therefor
- B01D15/08—Selective adsorption, e.g. chromatography
- B01D15/10—Selective adsorption, e.g. chromatography characterised by constructional or operational features
- B01D15/18—Selective adsorption, e.g. chromatography characterised by constructional or operational features relating to flow patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D15/00—Separating processes involving the treatment of liquids with solid sorbents; Apparatus therefor
- B01D15/08—Selective adsorption, e.g. chromatography
- B01D15/10—Selective adsorption, e.g. chromatography characterised by constructional or operational features
- B01D15/14—Selective adsorption, e.g. chromatography characterised by constructional or operational features relating to the introduction of the feed to the apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D15/00—Separating processes involving the treatment of liquids with solid sorbents; Apparatus therefor
- B01D15/08—Selective adsorption, e.g. chromatography
- B01D15/10—Selective adsorption, e.g. chromatography characterised by constructional or operational features
- B01D15/16—Selective adsorption, e.g. chromatography characterised by constructional or operational features relating to the conditioning of the fluid carrier
- B01D15/161—Temperature conditioning
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Abstract
The invention discloses a temperature control system and a temperature control method suitable for a simulated moving bed; the temperature control system comprises an adsorption bed, a raw material feeding system, a resolving agent feeding system, a circulating system, a liquid extraction system, a raffinate system, a program-controlled valve group, an automatic control system and a heat conduction oil system; the heat conduction oil system comprises a partition wall type heat exchanger, a heat conduction oil pump, a resolving agent heater and a raw material heater, wherein the partition wall type heat exchanger, the heat conduction oil pump, the resolving agent heater and the raw material heater are arranged on the periphery of the adsorption column, and the resolving agent heater is used for heating resolving agent, and the raw material heater is used for heating raw materials. The invention couples the heat conduction oil system and the simulated moving bed, can reasonably utilize the adsorption heat generated by the adsorption column, and uses the heat for heating the resolving agent and the raw materials, thereby improving the energy utilization rate, reducing the energy consumption and improving the temperature stability of the simulated moving bed system.
Description
Technical Field
The invention belongs to the technical field of simulated moving bed separation, and particularly relates to a temperature control system and a temperature control method suitable for a simulated moving bed.
Background
The simulated moving bed is a separation apparatus for performing a separation operation using the adsorption principle. The simulated moving bed technology is used as the main representative of continuous chromatography, has the advantages of high production efficiency, less organic solvent consumption, large mass transfer driving force, convenient automatic continuous production and the like, and is widely applied to the fields of petrochemical industry, food industry, pharmacy and the like.
Simulated moving bed technology is a complex industrial process and affects many nonlinear, unbalanced, non-ideal, multiple degree of freedom cyclic processes. In the adsorption process, molecules move to the solid surface, the molecular movement speed is greatly reduced, heat is released, and adsorption heat is generated. In the simulated moving bed device in the prior art, the adsorption heat is not effectively utilized, so that the temperature of an adsorption layer is increased, and the average activity of the adsorbent is reduced; and the temperature of each adsorption bed layer periodically fluctuates along with the change of the adsorption period, which is unfavorable for stable operation.
The existing conduction oil system is only in a simple continuous circulation heat exchange process, is not suitable for periodic heat exchange of a simulated moving bed, and is not suitable for a simulated moving bed device.
Disclosure of Invention
Aiming at the technical problems existing in the simulated moving bed in the prior art, the invention aims to disclose a temperature control system suitable for the simulated moving bed and a temperature control method of the simulated moving bed. According to the simulated moving bed temperature control system, the heat transfer process of the heat transfer oil is divided into four periods through the program control valve bank and is consistent with the four periods of simulated moving bed adsorption, so that the coupling of the heat transfer oil system and the simulated moving bed system is realized. The invention can reasonably utilize the adsorption heat generated by the adsorption column, and uses the heat for heating the resolving agent and the raw materials, thereby improving the energy utilization rate, reducing the energy consumption and improving the temperature stability of the simulated moving bed system.
The first aspect of the invention discloses a temperature control system suitable for a simulated moving bed, which adopts the following technical scheme.
A temperature control system suitable for a simulated moving bed comprises an adsorption bed, a raw material feeding system, a resolving agent feeding system, a circulating system, a liquid extraction system, a raffinate system, a program-controlled valve group, an automatic control system and a heat conducting oil system;
the adsorption bed comprises a plurality of adsorption columns, and is divided into an adsorption zone, a purification zone and a desorption zone;
the heat conduction oil system comprises a partition wall type heat exchanger, a heat conduction oil pump, a resolving agent heater and a raw material heater, wherein the partition wall type heat exchanger, the heat conduction oil pump, the resolving agent heater and the raw material heater are arranged on the periphery of the adsorption column, and the resolving agent heater is used for heating resolving agent; the heat conducting oil absorbs the adsorption heat emitted by the adsorption column in the adsorption stage in the dividing wall type heat exchanger, and heats the desorption agent needed by the desorption period in the desorption agent heater and the raw material in the raw material heater;
the upper end of each dividing wall type heat exchanger is provided with a heat conducting oil discharging valve, and the lower end of each dividing wall type heat exchanger is provided with a heat conducting oil feeding valve;
the upper end of each adsorption column is provided with a raw material feed valve, a resolving agent feed valve and a circulating liquid feed valve;
the lower end of each adsorption column is provided with a raffinate discharge valve and a extract discharge valve;
a one-way valve is arranged between two adjacent adsorption columns;
the raw material feeding system is connected with a raw material feeding valve of each adsorption column;
the resolving agent feeding system is connected with resolving agent feeding valves of each adsorption column;
the circulating system comprises a circulating pump, and the circulating system is connected with a circulating liquid feed valve of each adsorption column through the circulating pump;
the liquid extraction system is connected with a liquid extraction discharging valve of each adsorption column;
the raffinate system is connected with a raffinate discharge valve of each adsorption column;
all valves form a program-controlled valve group, the program-controlled valve group is connected with an automatic control system, and the automatic control system can control the opening and closing states of each valve in the program-controlled valve group.
Preferably, an additional heater is provided at the outlet of the desorption pump, which is supplemented with additional heat in case the heat of adsorption is not sufficient for the operation of the system.
Preferably, the number of the adsorption columns is 3-100.
Preferably, the number of the adsorption columns is 8*N, wherein N is an integer greater than or equal to 1. Further preferably, the number of the adsorption columns is 8.
Preferably, the liquid extraction system comprises a liquid extraction pump, and the liquid extraction pump is connected with a liquid extraction pipeline of the adsorption bed.
Preferably, the raffinate system comprises a raffinate pump, and the raffinate pump is connected with a raffinate pipeline of the adsorption bed.
Preferably, a feed inlet of a circulating pump of the circulating system is connected with a liquid extraction pipeline of the adsorption bed.
Preferably, the valve types in the program-controlled valve group are respectively and independently selected from one of a ball valve, a needle valve, a stop valve and a butterfly valve. Preferably, the actuator is pneumatic or electric.
Preferably, the adsorption bed further comprises a buffer zone, i.e. the adsorption bed is divided into an adsorption zone, a purification zone, a desorption zone and a buffer zone.
The second aspect of the invention discloses a simulated moving bed temperature control method using the temperature control system of the simulated moving bed, which adopts the following technical scheme.
The simulated moving bed temperature control method using the temperature control system suitable for the simulated moving bed comprises the following steps of,
the simulated moving bed adsorption separation process is divided into four periods of adsorption, buffering, desorption and purification by using a program-controlled valve bank, and the four periods are carried out continuously and sequentially by switching valves; when one adsorption column is in an adsorption period, the conduction oil feed valve and the conduction oil discharge valve corresponding to the adsorption column are opened, adsorption heat is carried away by using conduction oil in a partition wall heat exchange mode, and the conduction oil feed valves and the conduction oil discharge valves of other adsorption columns are in a closed state; the absorbed heat heats the desorbing agent required for the desorption cycle in the desorbing agent heater and heats the feedstock in the feedstock heater.
Preferably, the number of the adsorption columns is 8, and the simulated moving bed temperature control method specifically comprises the following steps:
in the 0-1t time sequence, the adsorption column 5 and the adsorption column 6 are positioned in an adsorption zone, and the corresponding conduction oil feed valve E7, the conduction oil discharge valve E8, the conduction oil feed valve F7 and the conduction oil discharge valve F8 are opened to enable conduction oil to flow through the partition wall type heat exchangers outside the adsorption column 5 and the adsorption column 6; when the adsorption column 5 is saturated after adsorption, the corresponding heat conducting oil feeding valve E7 and the corresponding heat conducting oil discharging valve E8 are closed, meanwhile, the adsorption column 7 enters the adsorption zone from the buffer zone, and the corresponding heat conducting oil feeding valve G7 and the corresponding heat conducting oil discharging valve G8 are opened to recover the adsorption heat of the adsorption column 7;
the valve is controlled to switch to change the feeding and discharging positions of t-2t, 2t-3t and 3t-4t time sequences, so that the simulated movement of the adsorption zone, the purification zone, the desorption zone and the buffer zone is realized, and the cycle is sequentially carried out.
The invention has the beneficial effects.
Aiming at the technical problems that the adsorption heat cannot be effectively utilized and the temperature of the simulated moving bed is unstable in the prior art, the invention creatively provides a method for realizing the coupling of a heat conduction oil system and the simulated moving bed system by dividing the heat exchange process of the heat conduction oil into four periods through a program-controlled valve group and conforming the four periods of adsorption of the heat conduction oil with the simulated moving bed. The invention can reasonably utilize the adsorption heat generated by the adsorption column, and uses the heat for heating the resolving agent and the raw materials, thereby improving the energy utilization rate, reducing the energy consumption and improving the temperature stability of the simulated moving bed system.
Drawings
FIG. 1 is a schematic diagram of a temperature control system suitable for a simulated moving bed according to the present invention.
Detailed Description
The technical scheme of the invention is further explained below in combination with the detailed description and the attached drawings.
Example 1
Taking 8 adsorption columns as an example, a temperature control system suitable for a simulated moving bed in this embodiment includes:
the device comprises an adsorption bed, a raw material feeding system, a resolving agent feeding system, a circulating system, a liquid extracting system, a program-controlled valve group, an automatic control system and a heat conducting oil circulating system;
wherein the adsorption bed comprises 8 adsorption columns, namely adsorption columns 1-8, and is divided into an adsorption zone, a purification zone, a desorption zone and a buffer zone (note that the adsorption bed comprising the adsorption zone, the purification zone, the desorption zone and the buffer zone is adopted in the embodiment, but the buffer zone is not necessarily selected for the invention, and belongs to the optional zone);
the heat conduction oil system comprises a partition wall type heat exchanger, a heat conduction oil pump, a resolving agent heater and a raw material heater, wherein the partition wall type heat exchanger, the heat conduction oil pump, the resolving agent heater and the raw material heater are arranged on the periphery of the adsorption column, and the resolving agent heater is used for heating resolving agent; the heat conducting oil absorbs the adsorption heat emitted by the adsorption column in the adsorption stage in the dividing wall type heat exchanger, and heats the desorption agent needed by the desorption period in the desorption agent heater and the raw material in the raw material heater;
the upper end of each dividing wall type heat exchanger is provided with heat conduction oil discharge valves A8, B8, C8, D8, E8, F8, G8 and H8, and the lower end is provided with heat conduction oil feed valves A7, B7, C7, D7, E7, F7, G7 and H7;
the upper end of each adsorption column is provided with a raw material feed valve A3, B3, C3, D3, E3, F3, G3 and H3, a resolving agent feed valve A2, B2, C2, D2, E2, F2, G2 and H2, a circulating liquid feed valve A4, B4, C4, D4, E4, F4, G4 and H4;
the lower end of each adsorption column is provided with raffinate discharge valves A5, B5, C5, D5, E5, F5, G5 and H5 and raffinate discharge valves A6, B6, C6, D6, E6, F6, G6 and H6;
check valves A1, B1, C1, D1, E1, F1, G1 and H1 are arranged between two adjacent adsorption columns;
the raw material feeding system is connected with raw material feeding valves A3, B3, C3, D3, E3, F3, G3 and H3 of each adsorption column;
the resolving agent feeding system is connected with resolving agent feeding valves A2, B2, C2, D2, E2, F2, G2 and H2 of each adsorption column;
the circulating system comprises a circulating pump, and the circulating system is connected with circulating liquid feed valves A4, B4, C4, D4, E4, F4, G4 and H4 of each adsorption column through the circulating pump;
the extraction liquid system is connected with extraction liquid discharge valves A6, B6, C6, D6, E6, F6, G6 and H6 of each adsorption column;
the raffinate system is connected with raffinate discharge valves A5, B5, C5, D5, E5, F5, G5 and H5 of each adsorption column;
all valves form a program-controlled valve group, the program-controlled valve group is connected with an automatic control system, and the automatic control system can control the opening and closing states of each valve in the program-controlled valve group.
As an improvement of the embodiment, an additional heater is optionally arranged at the outlet of the analytical pump, and the external heat is used for supplementing under the condition that the adsorption heat cannot meet the process operation.
As an improvement of this embodiment, optionally, the liquid extraction system includes a liquid extraction pump, and the liquid extraction pump is connected to the liquid extraction pipeline of the adsorption bed.
As an improvement of this embodiment, optionally, the raffinate system includes a raffinate pump, and the raffinate pump is connected to a raffinate line of the adsorbent bed.
As an improvement of this embodiment, optionally, the feed inlet of the circulating pump of the circulating system is connected to the liquid extraction line of the adsorbent bed.
As an improvement of the embodiment, the valve types in the program control valve group can be selected as one of a ball valve, a needle valve, a stop valve and a butterfly valve independently; that is, the 56 valves in this embodiment are each independently one of a ball valve, a needle valve, a stop valve, and a butterfly valve, and have no interference with each other. The valve actuating mechanism is pneumatic or electric.
Example 2
The temperature control process of the temperature control system suitable for the simulated moving bed of the embodiment 1 is adopted, the adsorption separation process of the simulated moving bed is divided into four periods of adsorption, buffering, desorption and purification by using the program-controlled valve group, and the four periods are carried out continuously and sequentially through valve switching;
in the 0-1t time sequence, the adsorption column 5 and the adsorption column 6 are positioned in an adsorption zone, and the corresponding conduction oil feed valve E7, the conduction oil discharge valve E8, the conduction oil feed valve F7 and the conduction oil discharge valve F8 are opened to enable conduction oil to flow through the partition wall type heat exchangers outside the adsorption column 5 and the adsorption column 6; when the adsorption column 5 is saturated after adsorption, the corresponding conduction oil feed valve E7 and conduction oil discharge valve E8 are closed, and meanwhile, the adsorption column 7 enters the adsorption zone from the buffer zone, and the corresponding conduction oil feed valve G7 and conduction oil discharge valve G8 are opened to recover the adsorption heat of the 7# adsorption column;
the valve is controlled to switch to change the feeding and discharging positions of t-2t, 2t-3t and 3t-4t time sequences, so that the simulated movement of the adsorption zone, the purification zone, the desorption zone and the buffer zone is realized, and the cycle is sequentially carried out.
Claims (10)
1. The temperature control method suitable for the simulated moving bed is characterized in that the temperature control system suitable for the simulated moving bed comprises an adsorption bed, a raw material feeding system, a resolving agent feeding system, a circulating system, a liquid extraction system, a raffinate system, a program-controlled valve group, an automatic control system and a heat conducting oil system;
the adsorption bed comprises a plurality of adsorption columns, and is divided into an adsorption zone, a purification zone and a desorption zone;
the heat conduction oil system comprises a partition wall type heat exchanger, a heat conduction oil pump, a resolving agent heater and a raw material heater, wherein the partition wall type heat exchanger, the heat conduction oil pump, the resolving agent heater and the raw material heater are arranged on the periphery of the adsorption column, and the resolving agent heater is used for heating resolving agent; the heat conducting oil absorbs the adsorption heat emitted by the adsorption column in the adsorption stage in the dividing wall type heat exchanger, and heats the desorption agent needed by the desorption period in the desorption agent heater and the raw material in the raw material heater;
the upper end of each dividing wall type heat exchanger is provided with a heat conducting oil discharging valve, and the lower end of each dividing wall type heat exchanger is provided with a heat conducting oil feeding valve;
the upper end of each adsorption column is provided with a raw material feed valve, a resolving agent feed valve and a circulating liquid feed valve;
the lower end of each adsorption column is provided with a raffinate discharge valve and a extract discharge valve;
a one-way valve is arranged between two adjacent adsorption columns;
the raw material feeding system is connected with a raw material feeding valve of each adsorption column;
the resolving agent feeding system is connected with resolving agent feeding valves of each adsorption column;
the circulating system comprises a circulating pump, and the circulating system is connected with a circulating liquid feed valve of each adsorption column through the circulating pump;
the liquid extraction system is connected with a liquid extraction discharging valve of each adsorption column;
the raffinate system is connected with a raffinate discharge valve of each adsorption column;
all valves form a program-controlled valve group, the program-controlled valve group is connected with an automatic control system, and the automatic control system can control the opening and closing states of each valve in the program-controlled valve group;
the temperature control method comprises the following steps: the simulated moving bed adsorption separation process is divided into four periods of adsorption, buffering, desorption and purification by using a program-controlled valve bank, and the four periods are carried out continuously and sequentially by switching valves; when one adsorption column is in an adsorption period, the conduction oil feed valve and the conduction oil discharge valve corresponding to the adsorption column are opened, adsorption heat is carried away by using conduction oil in a partition wall heat exchange mode, and the conduction oil feed valves and the conduction oil discharge valves of other adsorption columns are in a closed state; the absorbed heat heats the desorbing agent required for the desorption cycle in the desorbing agent heater and heats the feedstock in the feedstock heater.
2. A temperature control method for a simulated moving bed according to claim 1, wherein an additional heater is provided at the outlet of the desorption pump, and additional heat is used to supplement the heat of adsorption in the event that the heat of adsorption is not sufficient for system operation.
3. The method for controlling temperature of simulated moving bed according to claim 1, wherein the number of adsorption columns is 3-100.
4. The method for controlling temperature of a simulated moving bed according to claim 1, wherein the number of adsorption columns is 8*N, and N is an integer of 1 or more.
5. A temperature control method for a simulated moving bed as claimed in claim 1, wherein said draw-off system comprises a draw-off pump connected to a draw-off line of the adsorbent bed.
6. The method according to claim 1, wherein the raffinate system comprises a raffinate pump connected to a raffinate line of the adsorbent bed.
7. The method for controlling temperature of a simulated moving bed according to claim 1, wherein a feed inlet of a circulation pump of the circulation system is connected with a liquid extraction pipeline of the adsorption bed.
8. The method for controlling the temperature of a simulated moving bed according to claim 1, wherein the valve types in the programmable valve block are respectively and independently selected from one of a ball valve, a needle valve, a stop valve and a butterfly valve; the actuating mechanism is pneumatic or electric.
9. A temperature control method for a simulated moving bed as claimed in claim 1, wherein said adsorbent bed further comprises a buffer zone.
10. A simulated moving bed temperature control method as claimed in claim 9, wherein said adsorption columns are 8, said simulated moving bed temperature control method specifically comprising: in the 0-1t time sequence, the adsorption column 5 and the adsorption column 6 are positioned in an adsorption zone, and the corresponding conduction oil feed valve E7, the conduction oil discharge valve E8, the conduction oil feed valve F7 and the conduction oil discharge valve F8 are opened to enable conduction oil to flow through the partition wall type heat exchangers outside the adsorption column 5 and the adsorption column 6; when the adsorption column 5 is saturated after adsorption, the corresponding heat conducting oil feeding valve E7 and the corresponding heat conducting oil discharging valve E8 are closed, meanwhile, the adsorption column 7 enters the adsorption zone from the buffer zone, and the corresponding heat conducting oil feeding valve G7 and the corresponding heat conducting oil discharging valve G8 are opened to recover the adsorption heat of the adsorption column 7; the valve is controlled to switch to change the feeding and discharging positions of t-2t, 2t-3t and 3t-4t time sequences, so that the simulated movement of the adsorption zone, the purification zone, the desorption zone and the buffer zone is realized, and the cycle is sequentially carried out.
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| CN109432823B true CN109432823B (en) | 2023-11-21 |
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| US7288200B1 (en) * | 1999-06-09 | 2007-10-30 | Institut Francais Du Petrole | System for injecting a by-pass fluid in a separation method in a simulated moving bed |
| CN201618442U (en) * | 2009-12-08 | 2010-11-03 | 辽宁科技大学 | Three-band simulated moving bed chromatography device |
| CN202724749U (en) * | 2012-09-06 | 2013-02-13 | 河北工业大学 | Simulated moving bed device for continuously extracting potassium from seawater |
| CN206783460U (en) * | 2017-04-18 | 2017-12-22 | 天津大学 | The sea water desalinating unit of matter circulation absorption bed is returned with backheat |
| CN209575842U (en) * | 2018-11-14 | 2019-11-05 | 内蒙古伊泰煤基新材料研究院有限公司 | A kind of temperature control system suitable for Simulation moving bed |
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2018
- 2018-11-14 CN CN201811362625.7A patent/CN109432823B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1145060A (en) * | 1994-02-15 | 1997-03-12 | 莱利工业公司 | Desorption process and apparatus |
| CN1126628A (en) * | 1994-06-17 | 1996-07-17 | 代科化学工业株式会社 | Simulated moving bed chromatographic separation process |
| US7288200B1 (en) * | 1999-06-09 | 2007-10-30 | Institut Francais Du Petrole | System for injecting a by-pass fluid in a separation method in a simulated moving bed |
| CN201618442U (en) * | 2009-12-08 | 2010-11-03 | 辽宁科技大学 | Three-band simulated moving bed chromatography device |
| CN202724749U (en) * | 2012-09-06 | 2013-02-13 | 河北工业大学 | Simulated moving bed device for continuously extracting potassium from seawater |
| CN206783460U (en) * | 2017-04-18 | 2017-12-22 | 天津大学 | The sea water desalinating unit of matter circulation absorption bed is returned with backheat |
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