CN110354522B - Baffle tower gas distribution control method and control system - Google Patents
Baffle tower gas distribution control method and control system Download PDFInfo
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- CN110354522B CN110354522B CN201810312268.7A CN201810312268A CN110354522B CN 110354522 B CN110354522 B CN 110354522B CN 201810312268 A CN201810312268 A CN 201810312268A CN 110354522 B CN110354522 B CN 110354522B
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- weir
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/42—Regulation; Control
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Abstract
The invention discloses a method for controlling gas distribution of a clapboard tower, which controls the height of liquid level on a tower plate by controlling the weir heights of the tower plates in a pre-separation section and a lateral line discharging section, thereby realizing the control of gas flow distribution on two sides of a clapboard. A gas distribution control system for the method is disclosed, the system comprises an electric adjusting device, a gas speed measuring device, a sensing device and a controller; the gas speed measuring device sends signals of the flow velocity of gas entering the pre-separation section and the lateral line discharging section to the controller through the sensing device, the controller sends instructions to the electric adjusting device, the weir height is reduced when the measured signals are lower than a set value, and the weir height is increased when the measured signals are higher than the set value, so that the distribution of gas flow on two sides of the partition plate is realized. Compared with the prior art, the invention has the characteristics of simplicity, convenience and high efficiency.
Description
Technical Field
The invention relates to a baffle tower process, in particular to a baffle tower gas distribution control method and a baffle tower gas distribution control system.
Background
Rectification is a material separation unit commonly used in chemical production, but the thermal efficiency of the rectification process is very low, the energy consumption is huge, and the rectification process accounts for more than half of the whole chemical process. Generally, three component separation requires two rectification columns in series to obtain three different pure components. In the two-tower process, a back-mixing phenomenon exists in part of components, and unnecessary energy consumption is caused. The clapboard tower has the characteristic of complete thermal coupling, so that under the condition of achieving the same separation effect, the energy consumption can be greatly reduced, the equipment investment cost and the occupied area of a field can be reduced, and the clapboard tower is more and more widely applied to chemical production.
In the dividing wall column process, a tower top condenser provides liquid phase reflux of the whole column, a tower bottom reboiler provides gas phase reflux of the whole column, and controlling the flow distribution of reflux liquid and reflux gas on two sides of the dividing wall is an important factor of separation effect. Control of the gas flow distribution is difficult relative to control of the liquid flow distribution.
Chinese patent CN105498268A discloses a scheme for controlling gas phase flow rate of a partition plate tower, wherein a self-circulating pump system is installed at the side discharge side of the side line, and the liquid phase fluid flow rate is controlled by a pump, so as to control the liquid level height on a tower plate, and further change the pressure drop when the gas phase flows through the tower plate, thereby causing the change of the corresponding gas phase flow rate.
Chinese patent CN102872609A discloses a dividing wall rectifying tower, which comprises a liquid middle-section reflux distribution system and a tower bottom ascending gas distribution control system, wherein the gas distribution control system comprises a computer control system, and a differential pressure gauge and a gas distributor which are installed on two sides of the bottom of the dividing plate, the gas distributor comprises a transmission mechanism and blades, the transmission mechanism comprises a rotation executing mechanism, a transmission shaft, a screw, a gear, a guide connecting rod and a guide plate, the rotation executing mechanism drives the guide connecting rod and the guide plate during operation, and the guide plate drives the blades to rotate, thereby changing the included angle between the blades and the vertical direction, changing the channel section of the ascending gas, and realizing the distribution of gas flow.
Chinese patent CN106139627A discloses a dividing plate rectifying tower, which is mainly characterized in that gas dividing plates and driving shafts thereof are installed at two ends of a dividing plate, and the gas dividing plates rotate around shafts to control the distribution of gas-liquid phases at two sides of the dividing plate. Meanwhile, liquid collecting plates are arranged on two sides of the lower end separation plate, and external downcomers communicated with the liquid collecting plates are arranged on the liquid collecting plates and used for guiding liquid back into the rectifying tower.
Chinese patent CN205145640U discloses a gas distribution device for a dividing wall rectifying tower, which comprises a gas distributor, a flow measuring device, a gas pre-distributor, a controller, a rotating device and a connecting rod. The rotating device is controlled by the controller to rotate clockwise or anticlockwise to drive the connecting rod and the cover plate to move left and right, so that the gas circulation area of the vent hole plate is changed, and the gas flow in the gas inlet channel is adjusted.
In the above prior art, a set of complicated liquid phase or gas phase regulating system is required, for example, chinese patent CN105498268A installs a self-circulating pump system on the side discharge side, chinese patents CN102872609A, CN106139627A and CN205145640U set a gas distribution device in the gas channel and an actuating mechanism outside the partition tower for controlling the action of the gas distribution device. The additional liquid phase or gas phase regulating system invisibly increases the energy consumption of the operation of the clapboard tower and increases the complexity of the operation and the maintenance cost.
Disclosure of Invention
One of the purposes of the invention is to provide a partition tower gas distribution control method, which controls the height of liquid level on a tower plate by controlling the weir height of each tower plate in a pre-separation section and a lateral line discharging section, thereby realizing the control of gas flow distribution on two sides of a partition. Compared with the prior art, the invention has the characteristics of simplicity, convenience and high efficiency.
The invention also aims to provide a baffle tower gas distribution control system for the baffle tower gas distribution control method.
In order to achieve the first purpose, the invention adopts the technical scheme that: a method for controlling gas distribution of a partition tower is characterized in that outlet weirs are arranged on tower plates of a pre-separation section and a lateral line discharging section, and the height of liquid level on each tower plate is controlled by controlling the height of the outlet weirs, so that the gas flow on two sides of a partition is distributed.
Furthermore, a baffle capable of ascending and descending is arranged in the outlet weir, and the height of the weir is adjusted by controlling the height of the baffle.
When gas passes through the tower plate at a certain flow rate, the liquid holding level on the tower plate is high, the pressure drop of the gas passing through the tower plate is large, and the pressure drop of the gas passing through the tower plate is small. According to the invention, the outlet weirs are arranged on the tower plates of the pre-separation section and the lateral line discharging section, the liquid holding height on the tower plates is controlled by the outlet weirs, the liquid holding level is high when the weir height is larger, and the liquid holding level is smaller when the weir height is smaller. Because the pressure drop of the gas finally passing through the pre-separation section and the side line discharging section is the same, the air inflow at two sides can be changed along with the change of the liquid holding height on the tower plate, when the liquid holding height is large, the flow of the passing gas can be reduced, so that the gas flow speed is reduced, and the pressure drop of the gas passing through the tower plate is reduced; conversely, when the liquid-holding height is small, the flow rate of the gas passing therethrough increases, so that the flow rate of the gas increases and the pressure drop of the gas passing through the tray increases. Therefore, the automatic distribution of the gas flow on the two sides of the partition is realized by controlling the height of the weir at the outlet of the tower plate.
In order to achieve the second purpose, the invention adopts the technical scheme that: a baffle tower gas distribution control system comprises an electric adjusting device, a gas speed measuring device, a sensing device and a controller, wherein the electric adjusting device, the gas speed measuring device and the sensing device are electrically connected with the controller; the electric adjusting device is used for adjusting the heights of weirs on tower plates of the pre-separation section and the lateral line discharging section, and the gas speed measuring device is used for detecting the flow rates of gas entering the pre-separation section and the lateral line discharging section; the sensing device sends a measured flow signal to the controller, the controller sends an instruction to the electric adjusting device, the weir height is adjusted to be low when the measured signal is lower than a set value, and the weir height is adjusted to be high when the measured signal is higher than the set value, so that the distribution of gas flow on two sides of the partition plate is realized.
The air input of the two sides can be automatically distributed according to the preset gas distribution ratio through the control system.
Furthermore, the electric adjusting device comprises a weir plate adjusting mechanism and a motor connected with the weir plate adjusting mechanism, and the motor provides power for the weir plate adjusting mechanism; the weir plate adjusting mechanism adjusts the baffle to lift up and down in the outlet weir.
Furthermore, the weir plate adjusting mechanism comprises a gear and rack transmission pair, a gear is sleeved on an output shaft of the motor, the lower end of the rack is fixedly connected with the upper end of the baffle, and the upper end of the rack is in meshing transmission connection with the gear; the motor drives the gear to rotate, and the gear drives the rack to enable the baffle to ascend and descend in the outlet weir. The baffle can be lifted up and down in the outlet weir by the meshing transmission of the gear and the rack, the transmission is reliable, and the structure is simple.
Further, the weir plate adjusting mechanism comprises a screw and nut transmission pair, the upper end of the screw is in screw transmission connection with the nut, the lower end of the screw is fixedly connected with the upper end of the baffle, the motor drives the nut to rotate in a fixed mode, and the screw drives the baffle to lift up and down in the outlet weir.
The baffle can be lifted up and down in the outlet weir by the thread matching of the screw and the nut, the transmission is reliable, and the structure is simple.
Further, the baffle is a rectangular flat plate, and the length of the baffle is equal to that of the outlet weir; the central part of the outlet weir is provided with a groove matched with the baffle, and the baffle can freely move up and down in the groove. Further, the height of the baffle is the same as the height of the groove.
The invention has the beneficial effects that: compared with the prior art, the invention can realize the automatic regulation of the gas flow at the two sides of the partition board only by controlling the height of the liquid holding height on the tower plate by controlling the height of the tower plate outlet weir, and has the characteristics of simplicity, convenience and high efficiency. The invention can flexibly control the distribution ratio of the gas at the two sides of the clapboard.
Drawings
FIG. 1 is a schematic diagram of the baffle column gas distribution control system of the present invention.
FIG. 2 is a schematic diagram of a first embodiment of the electrically operated regulator of the barrier column gas distribution control system of the present invention.
FIG. 3 is a schematic diagram of the structure of a second embodiment of the electrically operated regulator of the barrier column gas distribution control system of the present invention.
FIG. 4 is a schematic diagram of the installation configuration of the tray outlet weir and baffle of the baffle column gas distribution control system of the present invention.
Fig. 5 is a schematic view of the structure of the outlet weir of fig. 4.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments.
The meaning of "and/or" in the present invention means that the respective single or both of them exist individually or in combination.
The meaning of "inside and outside" in the present invention means that the direction pointing to the inside of the device is inside and vice versa with respect to the device itself.
As shown in figure 1, a clapboard 2 is vertically arranged at the center of a clapboard tower 1, the upper part of the clapboard is a public rectification section, the lower part of the clapboard is a public stripping section, the left side of the clapboard is a pre-separation section A, and the right side of the clapboard is a lateral line discharging section B. The pre-separation section and the lateral line discharging section are both provided with a tower plate 3, an outlet of the tower plate 3 is provided with an outlet weir 4, and a baffle 5 which can freely lift up and down is arranged in the outlet weir. The descending liquid at the tower top passes through the pre-separation section and the lateral line discharging section from top to bottom, and the ascending gas at the tower bottom enters from the bottoms of the gas inlet channels 6 at the two sides of the partition plate respectively, flows out from the upper part of the gas inlet channels and passes through the pre-separation section and the lateral line discharging section from bottom to top.
Referring to fig. 4 and 5, the outlet weir 4 is a rectangular body, and a rectangular groove 41 is formed in the center of the rectangular body and penetrates forward and backward along the length direction of the rectangular body, and the shape of the groove 41 is matched with that of the baffle 5. The baffle 5 is a rectangular flat plate which can move up and down freely in the groove 41.
The liquid holding height of the descending liquid on the tower plate is controlled by the weir height of the outlet, and the weir height is the liquid holding level height, otherwise the weir height is small. The height of the baffle 5 in the outlet weir 4 is adjusted to adjust the weir height, when the baffle 5 rises, the liquid level on the tower plate rises, the pressure drop of the gas passing through the tower plate is increased, and the gas flow is reduced; conversely, the gas flow rate is increased. Thereby realizing the distribution of the gas flow on the two sides of the clapboard.
A partition tower gas distribution control system comprises an electric adjusting device 11, a gas speed measuring device 12, a sensing device 13 and a controller 14. The electric regulating device 11 is used for regulating the weir height. The gas speed measuring device 12 is arranged in the gas channel 6 and used for detecting the flow rate of gas entering the pre-separation section and the side line discharging section. The gas speed measuring device 12 transmits the measured signal to the controller 14 through the sensing device 13, the controller sends an instruction to the electric adjusting device 11, the electric adjusting device 11 reduces the weir height of the outlet weir when the measured signal is lower than a set value, and increases the weir height of the outlet weir when the measured signal is higher than the set value, so that the distribution of gas flow at two sides of the partition plate is realized.
Referring to fig. 2, the electric adjusting device 11 includes a slice adjusting mechanism 111 and a motor 112. The slice adjustment mechanism 111 includes a gear 1111 and a rack 1112. The motor 112 is installed outside the partition tower 1 through the motor bracket 1121, the motor shaft extends into the partition tower 1, the motor shaft and the partition tower are sealed in a rotating mode, and the gear 1111 is sleeved on the motor output shaft. The rack 1112 extends along the axis of the clapboard tower, the lower end of the rack is fixedly connected with the middle part of the upper end of the baffle 5, and the upper end of the rack is in meshed transmission connection with the gear 1111. The gear 1111 is driven by the motor 112 to rotate, and the rack 1112 drives the baffle 5 to move up and down in the outlet weir 4.
Referring to fig. 3, the electric adjusting device 11 includes a slice adjusting mechanism 111 and a motor 112. The slice adjustment mechanism 111 includes a screw 1114, a bevel gear 113, and a nut 1113. The nut 1113 is fixed on the bracket 1122 through a rotating shaft, and the outer edge of the nut is provided with bevel teeth meshed with the bevel gear 113; the screw 1114 extends along the axis of the clapboard tower, the upper end of the screw passes through the nut 1113 to be in screw transmission connection with the nut, and the lower end of the screw is fixedly connected with the middle part of the upper end of the baffle 5. The motor 112 is installed outside the partition tower 1 through the motor bracket 1121, the motor shaft extends into the partition tower 1, the motor shaft and the partition tower are rotationally sealed, the end of the motor shaft is sleeved with a bevel gear 113, and the bevel gear 113 is engaged with the bevel gear on the outer edge of the nut 1113. The motor 112 drives the bevel gear 113 to rotate, the bevel gear 113 drives the nut 1113 to rotate in a fixed manner, and the screw 1114 drives the baffle 5 to move up and down in the outlet weir 4.
In the embodiment of the control system, each tower plate is provided with an outlet weir, each outlet weir is correspondingly provided with a set of electric adjusting device, in order to simplify the design, the outlet weir and the matched electric adjusting device can be arranged on only one tower plate of the pre-separation section A and the side line discharging section B, and the effect of the invention can be achieved just by adjusting the liquid level of one tower plate.
Parts of the specification that are not specifically described are prior art or are otherwise achievable by the prior art.
Claims (7)
1. A partition tower gas distribution control method is characterized in that outlet weirs are arranged on tower plates of a pre-separation section and a lateral line discharging section, baffle plates capable of ascending and descending are arranged in the outlet weirs, ascending or descending of the baffle plates are adjusted through a control system, the height of the weir of the outlet weirs and the height of liquid levels on each tower plate are controlled, and therefore distribution of gas flow on two sides of a partition is achieved.
2. A control system for the control method of claim 1, wherein the control system comprises an electric adjusting device, a gas speed measuring device, a sensing device and a controller, and the electric adjusting device, the gas speed measuring device and the sensing device are all electrically connected with the controller; the electric adjusting device is used for adjusting the heights of weirs on tower plates of the pre-separation section and the lateral line discharging section, and the gas speed measuring device is used for detecting the flow rates of gas entering the pre-separation section and the lateral line discharging section; the sensing device sends a measured flow signal to the controller, the controller sends an instruction to the electric adjusting device, the weir height is adjusted to be low when the measured signal is lower than a set value, and the weir height is adjusted to be high when the measured signal is higher than the set value, so that the distribution of gas flow on two sides of the partition plate is realized.
3. The control system of claim 2, wherein the electrically operated adjustment device includes a weir plate adjustment mechanism and a motor coupled to the weir plate adjustment mechanism, the motor powering the weir plate adjustment mechanism; the weir plate adjusting mechanism adjusts the baffle to lift up and down in the outlet weir.
4. The control system of claim 3, wherein the weir plate adjusting mechanism comprises a gear-rack transmission pair, a gear is sleeved on the output shaft of the motor, the lower end of the rack is fixedly connected with the upper end of the baffle, and the upper end of the rack is in meshing transmission connection with the gear; the motor drives the gear to rotate, and the gear drives the rack to enable the baffle to ascend and descend in the outlet weir.
5. The control system of claim 3, wherein the weir plate adjustment mechanism comprises a screw and nut drive pair, wherein the upper end of the screw is in threaded drive connection with the nut, the lower end of the screw is fixedly connected with the upper end of the baffle, the motor drives the nut to rotate in a fixed manner, and the screw drives the baffle to move up and down in the outlet weir.
6. The control system of claim 2, wherein the baffle is a rectangular flat plate having a length equal to the length of the outlet weir; the central part of the outlet weir is provided with a groove matched with the baffle, and the baffle can freely move up and down in the groove.
7. The control system of claim 6, wherein the height of the baffle is the same as the height of the groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810312268.7A CN110354522B (en) | 2018-04-09 | 2018-04-09 | Baffle tower gas distribution control method and control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810312268.7A CN110354522B (en) | 2018-04-09 | 2018-04-09 | Baffle tower gas distribution control method and control system |
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| Publication Number | Publication Date |
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| CN110354522A CN110354522A (en) | 2019-10-22 |
| CN110354522B true CN110354522B (en) | 2021-07-23 |
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| CN201810312268.7A Active CN110354522B (en) | 2018-04-09 | 2018-04-09 | Baffle tower gas distribution control method and control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112774236B (en) * | 2020-12-10 | 2022-02-18 | 大连理工大学 | Shell-and-tube active gas phase distributor |
| CN114470839B (en) * | 2022-02-15 | 2022-11-11 | 全椒科利德电子材料有限公司 | High-purity propylene electron gas preparation is with high-efficient heat exchange vary voltage rectification equipment |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3346740A1 (en) * | 1983-12-23 | 1985-06-27 | Krupp Industrietechnik GmbH Werk Buckau Wolf, 4048 Grevenbroich | VIBRATION-FREE REPLACEMENT FLOORS |
| CN2048781U (en) * | 1989-05-02 | 1989-12-06 | 长沙市环保科技开发部 | High-efficient clarifier of waste gas |
| CN102872609B (en) * | 2011-07-11 | 2015-04-15 | 中国石油化工股份有限公司 | Dividing wall rectifying tower |
| EP3061507B1 (en) * | 2013-10-23 | 2018-06-20 | China Petroleum & Chemical Corporation | Partitioned column |
| CN203620278U (en) * | 2013-12-12 | 2014-06-04 | 河北工业大学 | Gas mixing device applied in partition plate tower |
| CN205145640U (en) * | 2015-10-21 | 2016-04-13 | 中国石油化工股份有限公司 | A gas distributing device for dividing wall rectifying column |
| CN105498268A (en) * | 2016-01-11 | 2016-04-20 | 天津大学 | Partition plate tower gas phase flow control scheme |
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