CN216630744U - Self-calibration small-flow feeding system - Google Patents
Self-calibration small-flow feeding system Download PDFInfo
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- CN216630744U CN216630744U CN202123347992.XU CN202123347992U CN216630744U CN 216630744 U CN216630744 U CN 216630744U CN 202123347992 U CN202123347992 U CN 202123347992U CN 216630744 U CN216630744 U CN 216630744U
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- 230000008018 melting Effects 0.000 claims description 50
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- 239000000463 material Substances 0.000 claims description 43
- 239000000155 melt Substances 0.000 claims description 30
- 230000001105 regulatory effect Effects 0.000 claims description 23
- 238000007599 discharging Methods 0.000 claims description 4
- 239000003054 catalyst Substances 0.000 abstract description 4
- 239000011343 solid material Substances 0.000 abstract description 4
- 238000011020 pilot scale process Methods 0.000 abstract description 3
- 239000011344 liquid material Substances 0.000 description 10
- SQNZJJAZBFDUTD-UHFFFAOYSA-N durene Chemical compound CC1=CC(C)=C(C)C=C1C SQNZJJAZBFDUTD-UHFFFAOYSA-N 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- VLDPXPPHXDGHEW-UHFFFAOYSA-N 1-chloro-2-dichlorophosphoryloxybenzene Chemical compound ClC1=CC=CC=C1OP(Cl)(Cl)=O VLDPXPPHXDGHEW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002572 peristaltic effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 210000005239 tubule Anatomy 0.000 description 1
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Abstract
The utility model discloses a self-calibration small-flow feeding system which is mainly suitable for feeding of a small-scale (pilot-scale) catalyst reactor, in particular to feeding of a normal-temperature solid material. This a charge-in system for reactor has degree of automation height, and feed flow control range is big, and the feed flow degree of accuracy is high, and feed flow is undulant little.
Description
Technical Field
The utility model relates to a small-flow feeding system, in particular to a feeding system for normal-temperature solid materials.
Background
The delivery of solid chemical raw materials is difficult to accurately control and measure, especially when the flow rate is small. The most common method at present is to heat and melt the mixture into liquid state, and then use pumps to transport and control the flow. In the catalyst research, the material flow is very small, a miniature metering pump such as an injection pump, a single plunger pump, a double plunger pump, a peristaltic pump, a gear pump and the like is required to be used, and the pumps have the advantages of easiness in control, high price, high maintenance cost, rigorous use conditions, no high temperature resistance, short service life and incapability of accurately metering the material flow instantly or in a short time.
The utility model further improves the original patent, and adds an intermediate tank on the basis of the original patent, so as to calculate the feeding amount more accurately.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a self-calibration small-flow feeding system, in particular to a small-flow feeding system for a material which is changed into a liquid state after a normal-temperature solid is heated, and more particularly to a small-flow feeding system which is used for feeding a reactor in experimental research and is mainly suitable for feeding a catalyst pilot-scale (pilot-scale) reactor.
The technical scheme of the utility model is as follows: a self-calibrating small flow feed system comprising: the device comprises a melting tank, an intermediate tank, a metering pipe, a gas pipeline I, a gas pipeline II, a PLC control unit, a temperature measuring element and a temperature control unit, wherein the intermediate tank is arranged between the melting tank and the metering pipe, the melting tank is provided with a melting tank air inlet valve, a melting tank exhaust valve and a melting tank discharge valve, the intermediate tank is provided with an intermediate tank feed valve, an intermediate tank air inlet valve, an intermediate tank exhaust valve and an intermediate tank discharge valve, the metering pipe is provided with a metering pipe air inlet valve, a metering pipe feed valve, a metering pipe discharge valve and a liquid level meter, and the liquid level meter is used for detecting the liquid level of materials in the metering pipe;
the gas pipeline I is connected with a port I of a three-way joint I, a port II of the three-way joint I is connected with a metering pipe through a metering pipe air inlet valve, a port III of the three-way joint I is connected with a port I of the three-way joint II through a middle tank air inlet valve, a port II of the three-way joint II is connected with a middle tank, and a port III of the three-way joint II is connected with the metering pipe through a pressure balance valve;
the gas pipeline II is connected with the melt tank through a melt tank inlet valve, the melt tank is connected with the intermediate tank through a melt tank outlet valve and an intermediate tank inlet valve in sequence, the intermediate tank is connected with the metering pipe through a metering pipe inlet valve, the metering pipe outlet valve is connected with a metering pipe outlet pipeline, the metering pipe outlet pipeline is provided with a micro electromagnetic valve, and the micro electromagnetic valve is connected with a PLC control unit; a pinhole is arranged at the discharge end of the discharge pipeline of the metering pipe;
the melting tank, the intermediate tank, the metering pipe and the liquid pipelines between the melting tank and the intermediate tank and between the intermediate tank and the metering pipe are provided with temperature measuring elements, and the temperature measuring elements are used for measuring the temperature of materials in the melting tank, the metering pipe, the intermediate tank and the liquid pipelines between the melting tank and the intermediate tank and between the intermediate tank and the metering pipe; the melting tank, the intermediate tank, the metering pipe and pipelines between the melting tank and the intermediate tank and between the intermediate tank and the metering pipe are all connected with a temperature control unit, and the temperature control unit is used for controlling the temperature of materials in the melting tank, the metering pipe, the intermediate tank and the pipelines between the melting tank and the intermediate tank and between the intermediate tank and the metering pipe; and the PLC control unit is used for controlling the switching frequency and time of the miniature electromagnetic valve.
The material flow direction sequence is as follows: the material is first melted in a melting tank and then enters an intermediate tank where it is reintroduced into a metering tube from which it flows into a subsequent device, such as a reactor.
Further, melt jar admission valve, melt jar discharge valve, melt jar material exhaust-valve, melt jar bleeder valve, intermediate tank feed valve, measurement pipe feed valve, intermediate tank bleeder valve, measurement pipe admission valve, measurement pipe bleeder valve, measurement pipe material exhaust-valve are manual valve.
Furthermore, the discharge valve of the intermediate tank and the feed valve of the metering pipe can be 2 independent valves, and can also be 1 valve, so that the discharge of the intermediate tank and the feed of the metering pipe are controlled.
Furthermore, the air inlet valve and the exhaust valve of the tundish are both electromagnetic valves, the air inlet valve of the tundish is marked as an electromagnetic valve I, and the exhaust valve of the tundish is marked as an electromagnetic valve II; an electromagnetic valve is further arranged between the discharge valve of the melting tank and the feed valve of the intermediate tank and is marked as an electromagnetic valve III, and the melting tank is connected with the intermediate tank sequentially through the discharge valve of the melting tank, the electromagnetic valve III and the feed valve of the intermediate tank;
further, a liquid level switch is arranged inside the intermediate tank.
Solenoid valve I is normally open solenoid valve usually, and solenoid valve II is normally closed solenoid valve usually, and solenoid valve III is normally closed solenoid valve, 3 solenoid valves and liquid level switch interlocking, and when the liquid level was less than liquid level switch's setting value, solenoid valve I closed, and solenoid valve II and solenoid valve III open, and solenoid valve I opens after the intermediate tank reachd the liquid level setting value, and solenoid valve II and solenoid valve III close. When the materials are conveyed from the melting tank to the intermediate tank, the electromagnetic valve II and the electromagnetic valve III can be automatically closed after the intermediate tank reaches the set liquid level, the electromagnetic valve I is opened, high-pressure gas is rapidly filled in the intermediate tank, and feeding is not carried out after the liquid level is further ensured. The material gets into the metering tube from the intermediate tank and relies on the action of gravity, in order to guarantee that the pressure of two containers is unanimous, needs gas pipeline I to carry out pressure balance.
Further, the liquid level meter is arranged in the measuring pipe or outside the measuring pipe, and can be any liquid level meter, preferably a glass pipe liquid level meter and an electronic liquid level meter, more preferably a magnetostrictive liquid level meter, and has high precision.
Furthermore, all the equipment, the liquid pipelines and the pipe fittings in the feeding system have heating or heat tracing functions and simultaneously have temperature display and control functions, and the temperature of materials in the material conveying pipelines among the melting tank, the intermediate tank and the metering tank is kept consistent.
Furthermore, the volume of the intermediate tank is smaller than that of the metering pipe, and the volume of the intermediate tank is 0.5-0.95 times, preferably 0.7-0.85 times of that of the metering pipe.
Further, the bottom of melt jar is equipped with melt jar material evacuation valve, the bottom of metering tube is equipped with metering tube material evacuation valve.
Furthermore, the discharge gate of melt jar is located the lower part of melt jar, and the evacuation mouth of melt jar material is located the bottom of melt jar, and melt jar admission valve and melt jar discharge valve are located the top of melt jar.
Furthermore, the air inlet, the air outlet and the feed inlet of the intermediate tank are both positioned on the upper part of the intermediate tank, the air inlet and the air outlet are positioned higher than the feed inlet, and the discharge outlet of the intermediate tank is positioned at the bottommost part of the intermediate tank.
Furthermore, the intermediate tank is of a structure with a thick lower part and a thin upper part, and the liquid level switch is arranged on the thin pipe part.
Furthermore, the diameter of the pinhole is 0.05-0.3 mm.
Further, the melt tank is installed on the ground, and the bottom of the intermediate tank is higher than the top of the metering tube.
Furthermore, a three-way joint III is arranged between the electromagnetic valve III and the feeding valve of the tundish, the electromagnetic valve III is connected with a port I of the three-way joint III, a port II of the three-way joint III is connected with the feeding valve of the tundish, and a temperature measuring element is inserted into the port III of the three-way joint III.
Further, an air pressure regulating valve I is arranged at the inlet end of the gas pipeline I, and the gas pipeline I is connected with a port I of the three-way joint I through the air pressure regulating valve I; the entry end of gas pipeline II is equipped with air pressure regulating valve II, gas pipeline II loops through air pressure regulating valve II, melt jar admission valve and links to each other with the melt jar.
Furthermore, the pressure of the air pressure regulating valve I is 1-10 times of that of the air pressure regulating valve II.
Further, the temperature measuring element is a thermal resistor or a thermocouple.
Further, the micro electromagnetic valve is an ultra micro electromagnetic valve.
Further, the temperature control unit is a temperature control meter.
Furthermore, the PLC control unit is connected with a display unit, and the display unit is used for displaying the switching frequency, the switching time and the discharging flow of the miniature electromagnetic valve.
The utility model has the beneficial effects that:
(1) the utility model can adopt a large melting tank, 1 small intermediate tank and 1 small metering tube, can ensure the constant temperature of the metering tube in continuous operation and continuous operation, and does not have the problem of large temperature fluctuation.
(2) The melt tank has a large volume and is placed on the ground for easy handling.
(3) The intermediate tank adopts thick structure from top to bottom, and liquid level switch installs in tubule portion, and liquid level switch can interlock with the solenoid valve, has guaranteed the invariant of material weight in the intermediate tank, follows the intermediate tank to the reinforced back of measurement pipe, can calculate the density coefficient of this measurement pipe material through the liquid level change to the density coefficient can be checked in reinforced all can at every turn, makes the calculation of material loading volume more accurate.
(4) Miniature solenoid valves, especially ultra miniature solenoid valves, when used in combination with a PLC control unit and a pinhole on a pipe, ensure very low flow rates and very stable flow rates.
(5) The utility model has the advantages of simple structure, convenient use, high automation degree of feeding for the reactor, large adjusting range of the feeding flow, high accuracy of the feeding flow, small fluctuation of the feeding flow and the like.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1-1, compressed air pipelines I, 1-2, compressed gas pipelines II, 1-3, compressed gas pipelines III, 1-4, liquid material pipelines I, 1-5, liquid material pipelines II, 1-6, compressed gas pipelines IV, 1-7, a metering pipe discharge pipeline 2-1, air pressure regulating valves I, 2-2, air pressure regulating valves II, 3-1, three-way joints I, 3-1-1, ports I, 3-1-2 of the three-way joint I, ports II, 3-1-3 of the three-way joint I, ports III, 3-2 of the three-way joint I, three-way joints II, 3-2-1, ports I, 3-2-2 of the three-way joint II, ports II, 3-2-3 of the three-way joint II and ports III of the three-way joint II, 3-3, three-way joints III, 3-3-1, a port I, 3-3-2 of a three-way joint III, a port II, 3-3-3 of the three-way joint III, a port III, 4-1 of the three-way joint III, an electromagnetic valve I, 4-2, an electromagnetic valve II, 4-3, an electromagnetic valve III, 5, a liquid level switch, 6-1, a middle tank feed valve, 6-2, a melt tank discharge valve, 6-3, a melt tank material exhaust valve, 6-4, a melt tank melt exhaust valve, 6-5, a melt tank inlet valve, 6-6, a middle tank discharge valve or a metering pipe feed valve, 6-7, a pressure balance valve, 6-8, a metering pipe inlet valve, 6-9, a metering pipe discharge valve, 6-10, a metering pipe material exhaust valve, 8-1 and a temperature measuring element I, 8-2 parts of temperature measuring elements II, 8-3 parts of temperature measuring elements III, 8-4 parts of temperature measuring elements IV, 7 parts of intermediate tank, 8 parts of temperature measuring elements, 9 parts of liquid level meter, 10 parts of metering pipe, 11 parts of melting tank, 12 parts of micro electromagnetic valve, 13 parts of PLC control unit, 14 parts of needle hole.
Detailed Description
The following provides a brief description of embodiments of the present invention, with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
As shown in figure 1, the self-calibration small-flow normal-temperature solid material feeding system comprises a pipeline, an air pressure regulating valve, a three-way joint, an electromagnetic valve, a liquid level switch 5, a hand valve, an intermediate tank 7, a temperature measuring element, a liquid level meter 9, a metering pipe 10, a melting tank 11, a miniature electromagnetic valve 12, a PLC (programmable logic controller) control unit 13 and a needle hole 14. The pipeline comprises a compressed air pipeline I1-1, a compressed gas pipeline II 1-2, a compressed gas pipeline III 1-3, a liquid material pipeline I1-4, a liquid material pipeline II 1-5, a compressed gas pipeline IV 1-6 and a metering pipe discharge pipeline 1-7, the air pressure regulating valve comprises an air pressure regulating valve I2-1 and an air pressure regulating valve II 2-2, the three-way joint comprises a three-way joint I3-1, a three-way joint II 3-2 and a three-way joint III 3-3, the electromagnetic valve comprises an electromagnetic valve I (a middle tank air inlet electromagnetic valve) 4-1, an electromagnetic valve II (a middle tank air exhaust electromagnetic valve) 4-2 and an electromagnetic valve III 4-3, the hand valve comprises a middle tank feed valve 6-1, a melt tank discharge valve 6-2, a tank material exhaust valve 6-3, The device comprises a melt tank exhaust valve 6-4, a melt tank air inlet valve 6-5, a tundish discharge valve or a metering pipe feed valve 6-6, a pressure balance valve 6-7, a metering pipe air inlet valve 6-8, a metering pipe discharge valve 6-9 and a metering pipe material exhaust valve 6-10, wherein the temperature measuring elements comprise a temperature measuring element I8-1, a temperature measuring element II 8-2, a temperature measuring element III 8-3 and a temperature measuring element IV 8-4.
A melt tank air inlet valve 6-5 and a melt tank exhaust valve 6-4 are arranged at the top of the melt tank 11, a melt tank discharge valve 6-2 is arranged at the bottom of the melt tank 11, and a melt emptying valve 6-3 of the melt tank is arranged at the bottommost part of the melt tank 11; a liquid level switch 5 is arranged in the intermediate tank 7, the liquid level switch 5 can be interlocked with a solenoid valve I4-1, a solenoid valve II 4-2 and a solenoid valve III 4-3, the solenoid valve I4-1 is normally open, the solenoid valve II 4-2 is normally closed, the solenoid valve III 4-3 is normally closed, when the liquid level of the intermediate tank 7 is lower than the set value of the liquid level switch 5, the solenoid valve I4-1 is closed, the solenoid valve II 4-2 and the solenoid valve III 4-3 are opened, and when the material in the intermediate tank 7 reaches the set value of the liquid level, the solenoid valve 4 acts (the solenoid valve I4-1 is opened, the solenoid valve II 4-2 and the solenoid valve III 4-3 are closed), so that the constant amount of the material stored in the intermediate tank 7 is ensured; the upper end of the metering pipe 10 is provided with a metering pipe air inlet valve 6-8, an intermediate tank discharge valve or a metering pipe feed valve 6-6 and a gas pressure balance valve 6-7, the lower end of the metering pipe 10 is provided with a metering pipe discharge valve 6-9, a micro electromagnetic valve 12, a PLC control unit 13 and a needle hole 14, the gas pressure balance valve 6-7 ensures the balance of gas in the metering pipe 10, ensures that the material in the intermediate tank 7 can flow into the metering pipe 10 by gravity, simultaneously ensures the stability of the pressure in the metering pipe 10, further ensures the stable discharge, the bottom of the metering pipe 10 is provided with a metering pipe material emptying valve 6-10, a liquid level meter 9 is arranged in the metering pipe 10, and the liquid level meter 9 is an electronic liquid level meter; the melting tank 11 is provided with a temperature measuring element II 8-2, the intermediate tank 7 is provided with a temperature measuring element I8-1, and the metering pipe 11 is provided with a temperature measuring element III 8-3. The number of pipelines requiring heat tracing is large, and the pipelines are mainly concentrated on the intermediate tank 7, so that the intermediate tank 7 is integrally heat-traced. A three-way joint III 3-3 is arranged between the electromagnetic valve III 4-3 and the intermediate tank feed valve 6-1, the electromagnetic valve III 4-3 is connected with a port I3-3-1 of the three-way joint III, a port II 3-3-2 of the three-way joint III is connected with the intermediate tank feed valve 6-1, and temperature measuring elements IV 8-4 inserted through the ports III 3-3-3 of the three-way joint III are also provided with heat tracing so as to ensure that the temperature of materials is equal in the process of conveying from the melting tank 11 to the metering pipe 10. The temperature measuring elements are all thermocouples. The intermediate tank 7 is of a structure with a thick lower part and a thin upper part, the liquid level switch 5 is installed on the thin pipe part, the volume of the intermediate tank 7 is smaller than that of the metering pipe 10, and the volume of the intermediate tank 7 is 0.7-0.85 times that of the metering pipe 10.
A compressed air pipeline I1-1 is connected with a port I3-1-1 of a three-way joint I through an air pressure regulating valve I2-1, a port II 3-1-2 of the three-way joint I is connected with a metering pipe 10 through a metering pipe air inlet valve 6-8, a port III 3-1-3 of the three-way joint I is connected with a port I3-2-1 of the three-way joint II through a middle tank air inlet valve 4-1, a port II 3-2-2 of the three-way joint II is connected with a middle tank 7, and a port III of the three-way joint II is connected with the metering pipe 10 through a pressure balance valve 6-7. The pressure of the air pressure regulating valve I2-1 is 1-10 times of that of the air pressure regulating valve II 2-2.
The compressed gas pipeline IV 1-6 is connected with the melt tank 11 through an air pressure regulating valve I2-1 and a melt tank air inlet valve 6-5 in sequence, the melt tank 11 is connected with the intermediate tank 7 through a melt tank discharge valve 6-2, a battery valve III 4-3 and an intermediate tank feed valve 6-1 in sequence, the intermediate tank 7 is connected with the metering pipe 10 through an intermediate tank discharge valve or a metering pipe feed valve 6-6, the metering pipe discharge valve 6-9 is connected with the metering pipe discharge pipeline 1-7, the metering pipe discharge pipeline 1-7 is provided with a micro electromagnetic valve 12, the micro electromagnetic valve 12 (especially the micro electromagnetic valve 12) is electrically connected with a PLC control unit 13, the PLC control unit 13 is electrically connected with a display unit, the discharge end of the metering pipe discharge pipeline 1-7 is provided with a pinhole 14, and the micro electromagnetic valve 12 is connected with the PLC control unit, the PLC control unit 13 is used for controlling the switching frequency and the switching time of the micro electromagnetic valve 12, the needle hole 14 and the micro electromagnetic valve 12 cooperatively control the flow rate of discharged materials, and small flow rate can be ensured, and the flow rate is very stable.
Compressed air enters a compressed air pipeline I1-1, sequentially passes through an air pressure regulating valve I2-1 and a three-way joint 3-1 and then is divided into two paths, one path of compressed air passes through a port II 3-1-2 of the three-way joint II and then is taken as a compressed gas pipeline II 1-2 and then enters a metering pipe 10, the other path of compressed air sequentially passes through a port III 3-1-3 of the three-way joint I, an electromagnetic valve 4-1 and the three-way joint 3-2 and then is divided into two paths, one path of compressed air passes through a port III 3-2-3 of the three-way joint II leftwards and is taken as a compressed gas pipeline III 1-3 and then enters an intermediate tank 7, and the other path of compressed air passes through a port II 3-2-2 of the three-way joint II and then downwards passes through a gas pressure balancing valve 6-7 and then enters the metering pipe 10. The compressed air enters a compressed gas pipeline IV 1-6, passes through an air pressure regulating valve II 2-2 and then enters a melting tank 11. A certain amount of solid material is added into the melting tank 11, and after the material in the melting tank 11 is melted and has a constant temperature, the material enters the intermediate tank 7 and is added into the metering pipe 11 from the intermediate tank 7. The specific method comprises the following steps: liquid materials in the melting tank 11 sequentially flow through a hand valve 6-2 (which is opened when the materials are fed from the melting tank 11 to the intermediate tank 7 and is closed after the materials are finished), an electromagnetic valve III 4-3, a three-way connector III 3-3 and a hand valve 6-1 (which is opened when the materials are fed from the melting tank 11 to the intermediate tank 7 and is closed after the materials are finished) through a liquid material pipeline I1-4 and then enter the intermediate tank 7. Wherein a temperature measuring element IV 8-4 is arranged on a port III 3-3-3 of the three-way joint III. The liquid material pipeline II 1-5 is connected with the intermediate tank 7 and the metering pipe 10, the liquid material flows into the metering pipe 10 from the intermediate tank 7, and the hand valve 6-6 (which is opened when the intermediate tank 7 feeds the metering pipe 10, is in a closed state at ordinary times, is opened when feeding, and is closed after feeding is finished) is arranged on the liquid material pipeline II. The measuring pipe discharging pipelines 1-7 are the outlet of the liquid material of the measuring pipe 10, the material flows out of the measuring pipe 10 and then flows into the lower unit, such as a reactor, through hand valves 6-9 (normally in an open state and closed when the vehicle is parked), a micro electromagnetic valve 12 (normally in an open state and closed when the vehicle is parked) and a pinhole 14 in sequence, and the diameter of the pinhole 14 is 1 mm. The micro electromagnetic valve 12 is controlled by the PLC control unit 13, and the flow of the material is controlled by the switching time and the switching frequency.
Example 1
The volume of the melting tank 11 is 30 liters, and the bottom of the melting tank is sealed in a clamping hoop mode, so that the charging is convenient. The diameter of the lower part of the intermediate tank 7 is 200mm, the diameter of the thin pipe part is 35mm, the total volume is 4.5L, the diameter of the metering pipe 10 is 80mm, and the length is 1300 mm. All pipelines all adopt 6mm stainless steel pipes, the hand valve is a 1/4 'caliber threaded ball valve, the electromagnetic valve is 1/4' caliber, the liquid level switch 5 adopts a double-reed pipe liquid level switch, and the liquid level meter 9 adopts a magnetostrictive liquid level meter. The temperature measuring elements are all thermocouples, and the temperature is controlled by a temperature control meter. The air pressure regulating valve adopts AR 2000. The miniature electromagnetic valve 12 adopts a 1 mm-diameter electromagnetic valve, the opening (opening to closing) time is 10ms, and the size of a pinhole is 1 mm.
In the test of preparing the pyromellitic dianhydride catalyst by the gas-phase oxidation of durene, the durene is fed by the system, and the melting point of the durene is 79.2 ℃. The melting tank 11, the intermediate tank 7 and the metering pipe 10, and the intermediate pipes and the pipelines for conveying materials between the melting tank 11 and the intermediate tank 7 and between the intermediate tank 7 and the metering pipe 10 are all heated by 90 ℃.
The utility model ensures the constant temperature of the metering pipe 10 during continuous operation and continuous operation, and the density coefficient (unit is g/mm) of the metering pipe 10 can be calibrated every time the metering pipe 10 is fed from the intermediate tank 7, thereby ensuring the accuracy of the calculation of the raw material consumption. The compressed air is used as power for conveying materials in the system, the pressure of an air pressure regulating valve I2-1 is set to be 0.3Mpa, and the pressure of an air pressure regulating valve II 2-2 is set to be 0.05 Mpa. The melting pot 11 can be placed on the ground, the intermediate pot 7 is 1.5m away from the ground, and the metering pipe 10 is placed on the ground. The utility model has the advantages of simple structure, convenient use, high automation degree of feeding for the reactor, large adjusting range of the feeding flow, high accuracy of the feeding flow, small fluctuation of the feeding flow and the like. The following table is a specific run 6h data.
The present invention is described in detail with reference to the embodiments, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes or modifications made according to the scope of the present application are included in the scope of the present invention.
Claims (10)
1. A self-calibrating low flow feed system, comprising: the device comprises a melting tank, an intermediate tank, a metering pipe, a gas pipeline I, a gas pipeline II, a liquid level meter, a PLC control unit, a temperature measuring element and a temperature control unit, wherein the intermediate tank is arranged between the melting tank and the metering pipe, the melting tank is provided with a melting tank air inlet valve, a melting tank exhaust valve and a melting tank discharge valve, the intermediate tank is provided with an intermediate tank feed valve, an intermediate tank air inlet electromagnetic valve, an intermediate tank exhaust electromagnetic valve and an intermediate tank discharge valve, and the metering pipe is provided with a metering pipe air inlet valve, a metering pipe feed valve, a metering pipe discharge valve and a liquid level meter;
the gas pipeline I is connected with a port I of a three-way joint I, a port II of the three-way joint I is connected with a metering pipe through a metering pipe air inlet valve, a port III of the three-way joint I is connected with a port I of the three-way joint II through a middle tank air inlet valve, a port II of the three-way joint II is connected with a middle tank, and a port III of the three-way joint II is connected with the metering pipe through a pressure balance valve;
the gas pipeline II is connected with the melt tank through a melt tank inlet valve, the melt tank is connected with the intermediate tank through a melt tank outlet valve and an intermediate tank inlet valve in sequence, the intermediate tank is connected with the metering pipe through a metering pipe inlet valve, the metering pipe outlet valve is connected with a metering pipe outlet pipeline, the metering pipe outlet pipeline is provided with a miniature electromagnetic valve, and the miniature electromagnetic valve is connected with a PLC control unit; a pinhole is arranged at the discharge end of the discharge pipeline of the metering pipe;
temperature measuring elements are arranged on the melting tank, the intermediate tank, the metering pipe and a pipeline between the melting tank and the intermediate tank; the melting tank, the metering pipe, the intermediate tank and the pipeline between the melting tank and the intermediate tank are all connected with a temperature control unit.
2. A self-calibrating low flow feed system according to claim 1, wherein said intermediate tank has a volume less than the volume of said metering tube.
3. A self-calibrating low flow feed system according to claim 2, wherein said intermediate tank has a volume of from 0.5 to 0.95 times the volume of said metering tube.
4. The self-calibrating low flow feed system of claim 1, wherein said tundish is of a lower coarse-upper fine structure; the diameter of the pinhole is 0.5-3 mm.
5. The self-calibrating small flow feed system of claim 1, wherein said melt tank inlet valve, melt tank outlet valve, melt tank material drain valve, melt tank outlet valve, intermediate tank inlet valve, intermediate tank outlet valve, metering tube inlet valve, metering tube outlet valve, and metering tube material drain valve are all manual valves;
the air inlet valve and the exhaust valve of the intermediate tank are both electromagnetic valves;
an electromagnetic valve is further arranged between the discharging valve of the melting tank and the feeding valve of the intermediate tank, and the melting tank is connected with the intermediate tank sequentially through the discharging valve of the melting tank, the electromagnetic valve and the feeding valve of the intermediate tank;
the intermediate tank is provided with a liquid level switch.
6. The self-calibrating low flow feed system of claim 1, wherein the temperature of the material in said conduit between said melter tank, tundish and metering tube is maintained uniform.
7. The self-calibrating small flow feed system of claim 1, wherein the gas inlet and outlet and the feed inlet of the tundish are located at the upper part of the tundish, the gas inlet and outlet are located at a higher position than the feed inlet, and the discharge outlet of the tundish is located at the bottommost part of the tundish.
8. A self-calibrating low flow feed system according to claim 1, wherein the bottom of said intermediate tank is higher than the top of said metering tube.
9. The self-calibrating low-flow feeding system as claimed in claim 1, wherein an air pressure regulating valve I is arranged at the inlet end of the gas pipeline I, and an air pressure regulating valve II is arranged at the inlet end of the gas pipeline II.
10. The self-calibrating small flow feed system of claim 9, wherein said air vent valve i has a pressure 1-10 times greater than the pressure of air vent valve ii.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115193342A (en) * | 2022-07-04 | 2022-10-18 | 中国科学院过程工程研究所 | Method for stabilizing flow of slurry material, device for realizing method and application of method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115193342A (en) * | 2022-07-04 | 2022-10-18 | 中国科学院过程工程研究所 | Method for stabilizing flow of slurry material, device for realizing method and application of method |
| CN115193342B (en) * | 2022-07-04 | 2024-04-05 | 中国科学院过程工程研究所 | Method for stabilizing slurry state material flow, device for realizing same and application |
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