Double-probe liquid level monitoring device for chlorophenol rectifying tower

Abstract

A double-probe liquid level monitoring device for a chlorophenol rectifying tower comprises a tower kettle, an upper diaphragm probe, a lower diaphragm probe and a pressure transmitter. An upper sleeve is arranged on the side wall of the upper part of the tower kettle, an upper circular membrane cylinder of the upper membrane probe is hermetically sleeved in the upper sleeve, the inner end of the upper circular membrane cylinder vertically extends into the tower kettle, and an upper membrane is hermetically arranged at the inner port of the upper circular membrane cylinder; a lower sleeve is arranged on the side wall of the lower part of the tower kettle, a lower circular membrane cylinder of a lower membrane probe is hermetically sleeved in the lower sleeve, the inner end of the lower circular membrane cylinder vertically extends into the tower kettle, and a lower membrane is hermetically arranged at the inner port of the lower circular membrane cylinder; the circular membrane cylinder in the membrane probe on the device extends into the tower kettle after being sleeved with the sleeve, so that the membrane is far away from the side wall of the tower kettle, the phenomenon that the membrane is blocked in a pipe body by colloidal viscous materials due to the fact that the membrane is used for a long time in the pipe body on the side wall of the rectifying tower and the viscosity of feed liquid is high is avoided, and the accuracy of liquid level monitoring is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of liquid level monitoring equipment, in particular to a double-probe chlorophenol distillation tower liquid level monitoring device. Background Art

[0002] The distillation of chlorophenol requires a distillation tower, which is usually a vertical cylindrical tower device. In the chlorophenol distillation tower, the mixture is heated, and the chlorophenol and other components boil and rise to the top of the tower, and then cool and condense into liquid in the condenser.

[0003] At present, the level gauges used in chlorophenol distillation towers are usually magnetic flap level gauges, double flange pressure differential level gauges or radioactive source level gauges. Magnetic flap level gauges have the disadvantage of demagnetization at high temperature, which leads to poor accuracy of level measurement, and radioactive source level gauges have radioactive hazards. The double flange pressure differential level gauge is mainly composed of pressure measuring diaphragms, capillaries, transmitters and other components. The principle is to calculate the liquid level height of the distillation tower using the pressure difference measured by the upper and lower diaphragms. However, the diaphragm of the existing double flange pressure differential level gauge is set in the tube body on the side wall of the distillation tower. After a long time of use, the tar in the tower will enter the tube body at the side wall from the side wall of the tower and block the diaphragm, causing distortion of the liquid level measurement value, which needs to be improved. Utility Model Content

[0004] In order to solve the above problems, the utility model proposes a double-probe chlorophenol distillation tower liquid level monitoring device.

[0005] The technical scheme of the utility model is: a double-probe chlorophenol distillation tower liquid level monitoring device, comprising a tower kettle, an upper diaphragm probe, a lower diaphragm probe and a pressure transmitter; an upper sleeve is provided on the side wall of the upper part of the tower kettle, the upper sleeve is welded and fixed to the tower kettle, an upper circular diaphragm cylinder of the upper diaphragm probe is sealed and sleeved in the upper sleeve, the upper circular diaphragm cylinder can slide freely in the upper sleeve, the inner end of the upper circular diaphragm cylinder vertically extends into the tower kettle, an upper diaphragm is sealed at the inner port of the upper circular diaphragm cylinder, and the outer end of the upper circular diaphragm cylinder is a closed structure; a lower sleeve is provided on the side wall of the lower part of the tower kettle, the lower sleeve is welded and fixed to the tower kettle, a lower circular diaphragm cylinder of the lower diaphragm probe is sealed and sleeved in the lower sleeve, the lower circular diaphragm cylinder can slide freely in the lower sleeve, the inner end of the lower circular diaphragm cylinder vertically extends into the tower kettle, a lower diaphragm is sealed at the inner port of the lower circular diaphragm cylinder, and the outer end of the lower circular diaphragm cylinder is a closed structure;

[0006] The outer end of the upper circular membrane cylinder is connected to the pressure transmitter through an upper capillary tube, and the outer end of the lower circular membrane cylinder is connected to the pressure transmitter through a lower capillary tube. A protective layer for corrosion prevention is sheathed outside the capillary tube.

[0007] Preferably, a plurality of annular grooves are evenly arranged on the surface of the upper diaphragm from the center to the outside, and a plurality of annular grooves are evenly arranged on the surface of the lower diaphragm from the center to the outside, and transition arcs are arranged on the edges of the annular grooves.

[0008] Preferably, the upper diaphragm is spaced a certain distance from the outer port of the upper circular diaphragm cylinder, the lower diaphragm is spaced a certain distance from the outer port of the lower circular diaphragm cylinder, and the surface of the diaphragm is parallel to the outer port of the circular diaphragm cylinder.

[0009] Preferably, the outer side surfaces of the inner ends of the upper circular membrane cylinder and the lower circular membrane cylinder are both provided with an annular groove, and the cross section of the annular groove is semicircular.

[0010] Preferably, the upper circular membrane cylinder and the upper sleeve are fixedly connected via an upper flange, and the lower circular membrane cylinder and the lower sleeve are fixedly connected via a lower flange.

[0011] Preferably, an upper joint communicating with the inner cavity of the upper circular membrane cylinder is provided at the center of the upper flange, and the upper capillary is connected to the upper joint.

[0012] Preferably, a lower joint communicating with the inner cavity of the lower circular membrane cylinder is provided at the center of the lower flange, and the lower capillary tube is connected to the lower joint.

[0013] Preferably, a steam coil is provided on the outer side of the tower kettle, the steam coil extends to both ends of the tower kettle, the cross section of the steam coil is semicircular, and the inner port thereof is welded and fixed to the tower kettle as a whole.

[0014] Preferably, a layer of rock wool is provided on the outside of the steam coil, and a protective tin foil is provided outside the rock wool.

[0015] The beneficial technical effects of the utility model are:

[0016] (1) The circular membrane tube in the diaphragm probe of the device is inserted into the bottom of the tower after the sleeve, so that the diaphragm is away from the side wall of the tower, avoiding the phenomenon that the diaphragm is used in the tube body on the side wall of the distillation tower for a long time and the high viscosity of the feed liquid will cause the diaphragm to be blocked in the tube body by colloid and viscous substances, thereby ensuring the accuracy of liquid level monitoring.

[0017] (2) A steam coil and an insulation layer are installed on the outside of the tower kettle of the device to heat and insulate the tower kettle, increase the reaction temperature in the tower kettle, ensure that the material temperature in the tower kettle is above the melting point, avoid the phenomenon that the chlorophenol series products have a high melting point and are easy to crystallize, and also avoid the phenomenon that clean matter adheres to the diaphragm and causes inaccurate sensing pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 yes Figure 1 A partial enlarged view of

[0020] Figure 3 It is a three-dimensional structural schematic diagram of the upper diaphragm probe of the utility model (the structure of the lower diaphragm probe is the same as that of the upper diaphragm probe).

[0021] In the figure, 11. tower kettle, 111. upper casing, 112. lower casing, 12. pressure transmitter, 13. upper circular membrane cylinder, 131. upper diaphragm, 132. upper joint, 14. lower circular membrane cylinder, 141. lower diaphragm, 142. lower joint, 15. annular groove, 16. upper capillary, 17. lower capillary, 18. annular groove, 19. upper flange, 20. lower flange, 21. steam coil, 22. rock wool, 23. protective tin foil. DETAILED DESCRIPTION

[0022] Example 1, see the attached specification Figure 1-3 A double-probe chlorophenol distillation tower liquid level monitoring device comprises a tower kettle 11, an upper diaphragm 131 probe, a lower diaphragm 141 probe and a pressure transmitter 12. The tower kettle 11 is 1.6m high, and the vertical distance between the upper diaphragm 131 probe and the lower diaphragm 141 probe is 1.4m. An upper sleeve 111 is arranged on the side wall of the upper part of the tower kettle 11. An upper circular membrane cylinder 13 of the upper diaphragm 131 probe is sealedly sleeved in the upper sleeve 111. The length of the upper circular membrane cylinder 13 is greater than the length of the upper sleeve 111. The inner end of the upper circular membrane cylinder 13 vertically extends into the interior of the tower kettle 11. An upper diaphragm 131 is sealed at the inner port of the diaphragm cylinder 13, and the outer end of the upper circular diaphragm cylinder 13 is a closed structure; a lower sleeve 112 is provided on the side wall of the lower part of the tower kettle 11, and the lower circular diaphragm cylinder 14 of the lower diaphragm 141 probe is sealed and sleeved in the lower sleeve 112, the length of the lower circular diaphragm cylinder 14 is greater than the length of the lower sleeve 112, the inner end of the lower circular diaphragm cylinder 14 vertically extends into the interior of the tower kettle 11, and a lower diaphragm 141 is sealed at the inner port of the lower circular diaphragm cylinder 14, the size of the lower diaphragm 141 is smaller than the size of the upper diaphragm 131, and the outer end of the lower circular diaphragm cylinder 14 is a closed structure;

[0023] The outer end of the upper circular membrane cylinder 13 is connected to the pressure transmitter 12 through the upper capillary 16, and the outer end of the lower circular membrane cylinder 14 is connected to the pressure transmitter 12 through the lower capillary 17. The pressure signal sensed by the diaphragm is transmitted to the pressure transmitter 12 through the capillary, and the pressure transmitter 12 measures the liquid level in the tower bottom 11 through the pressure signal difference.

[0024] The surface of the upper diaphragm 131 is evenly provided with a plurality of annular grooves 15 from the center to the outside, and the surface of the lower diaphragm 141 is evenly provided with a plurality of annular grooves 15 from the center to the outside. The annular grooves 15 are used to increase the contact area between the diaphragm and the liquid inside the tower bottom 11, thereby improving the sensitivity of the diaphragm to sensing pressure.

[0025] The upper diaphragm 131 is spaced a certain distance from the outer port of the upper circular diaphragm cylinder 13, and the lower diaphragm 141 is spaced a certain distance from the outer port of the lower circular diaphragm cylinder 14. Therefore, a cavity of a certain size is formed between the diaphragm and the circular diaphragm cylinder, so that the pressure generated by the internal liquid can be concentrated on the surface of the diaphragm, and the sensitivity of the diaphragm sensing pressure can also be improved. The outer side surfaces of the inner ends of the upper circular diaphragm cylinder 13 and the lower circular diaphragm cylinder 14 are both provided with annular grooves 18.

[0026] The upper circular membrane cylinder 13 and the upper sleeve 111 are fixedly connected by an upper flange 19, and the lower circular membrane cylinder 14 and the lower sleeve 112 are fixedly connected by a lower flange 20. The circular membrane cylinder can be fixed tightly in the sleeve by the flange to ensure its stability and facilitate disassembly and maintenance. An upper joint 132 connected to the inner cavity of the upper circular membrane cylinder 13 is provided at the center of the upper flange 19, and the upper capillary 16 is connected to the upper joint 132. A lower joint 142 connected to the inner cavity of the lower circular membrane cylinder 14 is provided at the center of the lower flange 20, and the lower capillary 17 is connected to the lower joint 142.

[0027] The principle of this embodiment is as follows: the upper diaphragm 131 at the inner end of the upper circular diaphragm cylinder 13 transmits the pressure signal of the upper liquid to the pressure transmitter 12 through the upper capillary 16, and the lower diaphragm 141 at the inner end of the lower circular diaphragm cylinder 14 transmits the pressure signal of the lower liquid to the pressure transmitter 12 through the lower capillary 17. The pressure transmitter 12 measures the liquid level in the tower kettle 11 by the pressure signal difference, and the circular diaphragm cylinder in the upper diaphragm 131 probe is inserted into the tower kettle 11 after being mounted in the sleeve, so that the diaphragm is away from the side wall of the tower kettle 11, avoiding the phenomenon that the diaphragm is used in the tube body on the side wall of the distillation tower for a long time and the high viscosity of the liquid will cause the diaphragm to be blocked in the tube body by gelatinous viscous substances, thereby ensuring the accuracy of liquid level monitoring.

[0028] Example 2, see the attached specification Figure 2 A steam coil 21 is provided on the outer side of the tower kettle 11, a layer of rock wool 22 is provided on the outer side of the steam coil 21, and a protective tin foil 23 is provided on the outer side of the rock wool 22. The steam coil 21 and the rock wool 22 in this embodiment are used to heat and insulate the tower kettle 11, increase the reaction temperature in the tower kettle 11, ensure that the material temperature in the tower kettle 11 is above the melting point, avoid the phenomenon that the chlorophenol series products have a high melting point and are easy to crystallize, and also avoid the phenomenon that the clean matter is attached to the diaphragm and causes inaccurate sensing pressure.

Claims

1. A dual-probe chlorophenol distillation tower liquid level monitoring device, characterized in that: It includes a tower kettle, an upper diaphragm probe, a lower diaphragm probe and a pressure transmitter; An upper sleeve is provided on the side wall of the upper part of the tower kettle, and the upper circular membrane cylinder of the upper diaphragm probe is sealed and sleeved in the upper sleeve, the inner end of the upper circular membrane cylinder vertically extends into the tower kettle, and an upper diaphragm is sealed at the inner port of the upper circular membrane cylinder, and the outer end of the upper circular membrane cylinder is a closed structure; a lower sleeve is provided on the side wall of the lower part of the tower kettle, and the lower circular membrane cylinder of the lower diaphragm probe is sealed and sleeved in the lower sleeve, the inner end of the lower circular membrane cylinder vertically extends into the tower kettle, and a lower diaphragm is sealed at the inner port of the lower circular membrane cylinder, and the outer end of the lower circular membrane cylinder is a closed structure; The outer end of the upper circular membrane cylinder is connected to the pressure transmitter through an upper capillary tube, and the outer end of the lower circular membrane cylinder is connected to the pressure transmitter through a lower capillary tube.

2. A dual-probe chlorophenol distillation tower liquid level monitoring device according to claim 1, characterized in that: The surface of the upper diaphragm is evenly provided with a plurality of annular grooves from the center to the outside, and the surface of the lower diaphragm is evenly provided with a plurality of annular grooves from the center to the outside.

3. A dual-probe chlorophenol distillation tower liquid level monitoring device according to claim 1, characterized in that: There is a certain distance between the upper diaphragm and the outer port of the upper circular diaphragm cylinder, and there is a certain distance between the lower diaphragm and the outer port of the lower circular diaphragm cylinder.

4. A dual-probe chlorophenol distillation tower liquid level monitoring device according to claim 1, characterized in that: The outer side surfaces of the inner ends of the upper circular film cylinder and the lower circular film cylinder are both provided with annular grooves.

5. A dual-probe chlorophenol distillation tower liquid level monitoring device according to claim 1, characterized in that: The upper circular membrane cylinder and the upper sleeve are fixedly connected via an upper flange, and the lower circular membrane cylinder and the lower sleeve are fixedly connected via a lower flange.

6. A dual-probe chlorophenol distillation tower liquid level monitoring device according to claim 5, characterized in that: An upper joint communicating with the inner cavity of the upper circular membrane cylinder is provided at the center of the upper flange, and the upper capillary is connected to the upper joint. A lower joint communicating with the inner cavity of the lower circular membrane cylinder is provided at the center of the lower flange, and the lower capillary is connected to the lower joint.

7. A dual-probe chlorophenol distillation tower liquid level monitoring device according to claim 1, characterized in that: A steam coil is arranged on the outer side of the tower kettle.

8. A dual-probe chlorophenol distillation tower liquid level monitoring device according to claim 7, characterized in that: A layer of rock wool is arranged on the outer side of the steam coil, and a protective tin foil is arranged on the outer side of the rock wool.

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