CN111912491A - Liquid level measuring device for pressure container - Google Patents
Liquid level measuring device for pressure container Download PDFInfo
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- CN111912491A CN111912491A CN202010930524.6A CN202010930524A CN111912491A CN 111912491 A CN111912491 A CN 111912491A CN 202010930524 A CN202010930524 A CN 202010930524A CN 111912491 A CN111912491 A CN 111912491A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
Abstract
The invention belongs to the technical field of chemical production, and particularly relates to a liquid level measuring device for a pressure container, which comprises the pressure container, and a high pressure taking pipe and a low pressure taking pipe which are fixedly connected with the pressure container at different heights, wherein the input end of the high pressure taking pipe is connected with the pressure container, and the output end of the high pressure taking pipe is fixedly connected with a negative pressure chamber flange ball valve; the method of adopting the double-pressure-guiding type differential liquid level transmitter is characterized in that two source measuring points are connected to two different heights of a pressure container, the pressure difference at the source measuring element is converted into the height of a pressure container page, and a pressure signal is transmitted to the diaphragm type pressure transmitter through a capillary tube by a flat diaphragm double flange and a connecting diaphragm flange, so that the height of the liquid level of the pressure container is directly read, and the level of a medium with the characteristics of corrosivity, high viscosity, easy crystallization and low freezing point can be measured; has the characteristics of higher sensitivity and stable signal processing, and can deal with various process conditions.
Description
Technical Field
The invention belongs to the technical field of chemical production, and particularly relates to a liquid level measuring device for a pressure container.
Background
In daily life, various daily necessities such as plastic, straws, containers and the like are used. Most are synthesized directly or indirectly from chemical products. The chemical products of petroleum, chemical industry, medicine, etc. are produced by using the corresponding mechanical equipment under certain conditions according to certain technological processes. With the development of science, development and industrial production, pressure vessels have been widely used in various industrial fields such as petroleum, chemical industry, medicine, environmental protection, food and the like. For example, the pressure vessels such as a synthesis tower, a heat exchanger, a separator, a reactor, a storage tank and the like which are matched with the pressure vessels are needed for producing the urea; the crude oil processing needs a rectifying tower, a heat exchanger, a heating furnace and other pressure vessels which are matched with the crude oil production process; in addition, various tower equipment used for processes such as rectification, analysis, absorption, extraction and the like are also pressure vessels; various heat exchangers for fluid heating, cooling, liquid vaporization, vapor condensation and waste heat recovery still belong to pressure vessels; the reaction equipment for polymerization, hydrogenation and cracking processes in the production of three synthetic materials in petrochemical industry, and various equipment for storing, transporting and metering raw materials, finished products and semi-finished products are pressure vessels.
The pressure vessels are various in types, the operation conditions are complex, and the vacuum vessels and the high-pressure and ultrahigh-pressure equipment are adopted; the temperature also ranges from low temperature to high temperature, and most of the treated media are corrosive, flammable, explosive, toxic and even extremely toxic. The operation characteristics of the diversity cause complexity in aspects of material selection, manufacturing, inspection, use, maintenance, management and the like of the pressure vessel, and therefore, certain difficulty is caused in measuring operation parameters during the production of the pressure vessel.
The control of the liquid level of the pressure vessel is one of important parameters in the chemical production process, for example, the control of the liquid level of a tower kettle in an absorption tower or a rectification tower, when the liquid level is too high, liquid flooding of liquid phase material flow on a tower plate can be caused, and even operation accidents such as tower flooding can be caused in severe cases. Too low a level can lead to plate drying on the trays, which can seriously affect the efficiency of the unit operation. Further affecting the quality of the product.
Accordingly, one skilled in the art has devised a pressure vessel level measurement apparatus to address the problems set forth in the preceding background.
Disclosure of Invention
To solve the problems set forth in the background art described above. The invention provides a double-lead differential pressure liquid level transmitter for measuring the liquid level of a pressure container, which measures the liquid level of the pressure container by a method of leading out two different measuring points from the pressure container, and has the characteristics of simple structure, easy manufacture, convenient and quick installation, strong adaptability and suitability for various pressure container media.
In order to achieve the purpose, the invention provides the following technical scheme: a liquid level measuring device of a pressure container comprises the pressure container and a high pressure taking pipe and a low pressure taking pipe which are fixedly connected with the pressure container at different heights, wherein the input end of the high pressure taking pipe is connected with the pressure container, the output end of the high pressure taking pipe is fixedly connected with a negative pressure chamber flange ball valve and is connected with the input end of the negative pressure chamber flange ball valve, the output end of the negative pressure chamber flange ball valve is connected with a capillary pipe through a negative pressure chamber connecting diaphragm flange, the output end of the capillary pipe is connected with a diaphragm type differential pressure transmitter through three groups of valves, the input end of the low pressure taking pipe is connected with the pressure container, the output end of the low pressure taking pipe is fixedly connected with a positive pressure chamber flange ball valve and is connected with the input end of the positive pressure chamber flange ball valve, the output end of the positive pressure chamber flange ball valve is, and the output end of the capillary tube is connected with the input end of the diaphragm type differential pressure transmitter through the three groups of valves.
Preferably, the three groups of valves are fixedly provided with a measuring gauge head, and the capillary is used for connecting the negative pressure chamber connecting membrane flange, the positive pressure chamber connecting membrane flange and the measuring gauge head.
Preferably, the high pressure taking pipe and the low pressure taking pipe are respectively installed at different heights on the pressure container, and both the high pressure taking pipe and the low pressure taking pipe are made of SS316L stainless steel.
Preferably, the negative pressure chamber connecting diaphragm flange and the positive pressure chamber connecting diaphragm flange are both in a flat diaphragm double-flange structure.
Preferably, the pressure vessel has a positive pressure chamber thereinForce P1＝ρ2gh1+ρ1gH+P0Pressure of the negative pressure chamber is P2＝ρ2gh2+P0。
Preferably, when the diaphragm type differential pressure transmitter and the low pressure taking point of the pressure container are arranged on the same horizontal plane, the range of differential pressure delta P measured by the differential pressure transmitter is [ -rho [ ]1gHmax]。
Preferably, the installation position of the diaphragm type differential pressure transmitter and the lowest liquid level are not on the same horizontal plane, the distance between the horizontal position of the diaphragm type differential pressure transmitter and the low pressure taking point of the pressure container is h1, and the range of differential pressure delta P measured by the diaphragm type differential pressure transmitter is [ rho ]1gh1～(ρ1gHmax+ρ1gh1)]And the zero point of the diaphragm type differential pressure transmitter is transferred in a forward direction.
Preferably, when the installation position of the diaphragm type differential pressure transmitter and the lowest liquid level are not on the same horizontal plane, and isolation liquid is respectively filled between a positive pressure chamber and a negative pressure chamber of the diaphragm type differential pressure transmitter and a pressure taking point on the pressure container, the range of differential pressure delta P measured by the diaphragm type differential pressure transmitter is { -rho2g(h2-h1)～[ρ1gHmax-ρ2g(h2-h1)]And the zero point of the diaphragm type differential pressure transmitter is subjected to negative migration.
Preferably, the measuring gauge head can be fixedly arranged on a field heat preservation protection box or a mounting bracket, the connection mode is a standard electrical interface and is used for transmitting 4-20mA signals, and a liquid crystal display panel is arranged on the measuring gauge head.
Preferably, the capillary tube is filled with silicone oil.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts a method of a double-pressure-guiding type differential liquid level transmitter, wherein two source measuring points are connected to two different heights of a pressure container, the pressure difference at a source measuring element is converted into the height of a pressure container page, and a pressure signal is transmitted to a diaphragm type pressure transmitter by a flat diaphragm double flange and a connecting diaphragm flange through a capillary tube, so that the height of the liquid level of the pressure container is directly read, and the level of a medium with the characteristics of corrosivity, high viscosity, easy crystallization and low freezing point can be measured; the method has the characteristics of high sensitivity and stable signal processing, and can cope with various process conditions; the device has the advantages of simple structure, high accuracy, convenience in installation and maintenance, easiness in combination into a control system, high precision, small measurement error and wide application range, and is used for continuously measuring the liquid levels of pressure containers such as towers, tanks and grooves in a continuous or intermittent production process.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a configuration in which a transmitter and a low pressure taking point of a pressure vessel are installed on the same horizontal plane in a liquid phase position according to the present invention;
FIG. 2 is a schematic diagram of the present invention in which the transmitter and the low pressure point of the pressure vessel are not installed on the same horizontal plane in the liquid phase position.
In the figure: 1. a pressure vessel; 2. a negative pressure chamber flange ball valve; 3. a positive pressure chamber flange ball valve; 4. the negative pressure chamber is connected with the diaphragm flange; 5. the positive pressure chamber is connected with a diaphragm flange; 6. a capillary tube; 7. three groups of valves; 8. a diaphragm type differential pressure transmitter; 9. a high pressure tapping pipe; 10. low pressure pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides the following technical solutions: a liquid level measuring device of a pressure container comprises a pressure container 1 and a high pressure taking pipe 9 and a low pressure taking pipe 10 which are fixedly connected with the pressure container 1 at different heights, wherein the input end of the high pressure taking pipe 9 is connected with the pressure container 1, the output end of the high pressure taking pipe 9 is fixedly connected with a negative pressure chamber flange ball valve 2 and is connected with the input end of the negative pressure chamber flange ball valve 2, the output end of the negative pressure chamber flange ball valve 2 is connected with a capillary 6 through a negative pressure chamber connecting diaphragm flange 4, the output end of the capillary 6 is connected with a diaphragm type differential pressure transmitter 8 through three groups of valves 7, the input end of the low pressure taking pipe 10 is connected with the pressure container 1, the output end of the low pressure taking pipe 10 is fixedly connected with a positive pressure chamber flange ball valve 3 and is connected with the input end of the positive pressure chamber flange ball valve 3, the output end of, the output end of the capillary tube 6 is connected with the input end of a diaphragm type differential pressure transmitter 8 through three groups of valves 7.
Specifically, the three groups of valves 7 are fixedly provided with a measuring gauge head, the capillary 6 is used for connecting the negative pressure chamber connecting diaphragm flange 4, the positive pressure chamber connecting diaphragm flange 5 and the measuring gauge head, and the measuring gauge head can be fixedly arranged on a field heat preservation protection box or a mounting bracket. The connection mode is a standard electrical interface used for transmitting 4-20mA signals, and a liquid crystal display panel is arranged on the measuring meter head, so that reading is facilitated.
Specifically, the high pressure taking pipe 9 and the low pressure taking pipe 10 are respectively installed at positions of different heights on the pressure container 1, the high pressure taking pipe 9 and the low pressure taking pipe 10 are made of SS316L stainless steel, two source taking measuring points are connected to two different heights of the pressure container, the pressure difference at the source taking point measuring element is converted into the height of a pressure container page, a pressure signal is transmitted to the diaphragm type pressure transmitter 8 through the capillary 6 by the flat diaphragm double flange, and therefore the height of the liquid level of the pressure container 1 is directly read.
Specifically, negative pressure chamber connection diaphragm flange 4 is flat diaphragm double flange structure with positive pressure chamber connection diaphragm flange 5, and the leakproofness is good, and connection stability is strong, and it is high to detect the precision, and error range is little.
Specifically, the pressure in the positive pressure chamber inside the pressure vessel 1 is P1＝ρ2gh1+ρ1gH+P0Pressure of the negative pressure chamber is P2＝ρ2gh2+P0P0 is the pressure in the pressure vessel 1 above the liquid surface.
Specifically, when the diaphragm type differential pressure transmitter 8 and the low pressure taking point of the pressure container 1 are installed on the same horizontal plane, the pressure P of the positive pressure chamber1＝ρ1gH+P0Negative pressure chamber pressure P2＝P0Pressure difference Δ P ═ ρ between positive and negative pressure chambers1gH (wherein: pressure of the pressure vessel 1 above the liquid level of P0, P)1H is the height of the measured liquid level, which is the density of the measured medium), when the liquid level changes from H-0 to H-Hmax, the differential pressure measured by the diaphragm type differential pressure transmitter 8 changes from Δ P-0 to Δ P- ρ1gHmaxThe output was changed from 4mA to 20 mA.
Specifically, the installation position of the diaphragm type differential pressure transmitter 8 is not on the same horizontal plane as the lowest liquid level, the distance between the horizontal position of the diaphragm type differential pressure transmitter 8 and the low pressure taking point of the pressure vessel 1 is h1, and the range of differential pressure Δ P measured by the diaphragm type differential pressure transmitter 8 is [ ρ [ ]1gh1～(ρ1gHmax+ρ1gh1)]When the zero point of the diaphragm type differential pressure transmitter 8 is transferred in the positive direction, the pressure P of the positive pressure chamber1＝ρ1gH+ρ1gh1+P0Negative pressure chamber pressure P2＝P0Pressure difference Δ P ═ ρ between positive and negative pressure chambers1gH+ρ1gh1When the liquid level changes from H-0 to H-Hmax, the differential pressure measured by the diaphragm type differential pressure transmitter 8 is Δ P ═ ρ1gh1Becomes Δ P ═ ρ1gHmax+ρ1gh1Because the positive differential pressure chamber has static pressure, the zero point of the diaphragm differential pressure transmitter 8 is subjected to forward migration, the minimum output signal is larger than 4mA, the maximum output signal is larger than 20mA, the differential pressure output of the positive differential pressure chamber is adjusted to be a measuring range offline through the handheld operator, the output signal is changed into 4mA-20mA, and the generated differential pressure effect is counteracted.
Specifically, when the installation position of the diaphragm type differential pressure transmitter 8 and the lowest liquid level are not on the same horizontal plane, and the isolation liquid is respectively filled between the positive pressure chamber and the negative pressure chamber of the diaphragm type differential pressure transmitter 8 and the pressure taking point on the pressure container 1, the range of differential pressure delta P measured by the diaphragm type differential pressure transmitter 8 is { -rho2g(h2-h1)～[ρ1gHmax-ρ2g(h2-h1)]In order to prevent liquid or gas in the pressure container 1 from entering a pressure taking chamber of the diaphragm type differential pressure transmitter 8 to cause blockage of a pressure leading pipeline, isolation liquid (with density of rho) is respectively filled between a positive pressure chamber and a negative pressure chamber of the diaphragm type differential pressure transmitter 8 and a pressure taking point2) The distance between the horizontal position of the diaphragm type differential pressure transmitter 8 and the high pressure sampling pipe 9 is h2, and the pressure of the positive pressure chamber is P1＝ρ2gh1+ρ1gH+P0Negative pressure chamber pressure P2＝ρ2gh2+P0The pressure difference between the positive and negative pressure chambers is Δ P ═ ρ1gH-ρ2g(h2-h1) When the liquid level changes from H-0 to H-Hmax, the differential pressure measured by the diaphragm type differential pressure transmitter 8 is represented by Δ P- ρ2g(h2-h1) Becomes Δ P ═ ρ1gHmax-ρ2g(h2-h1) Because the negative pressure difference chamber has static pressure, the zero point of the transmitter is subjected to negative-direction migration, the minimum output signal is smaller than 4mA, the maximum output signal is smaller than 20mA, the pressure difference output of the positive pressure chamber is adjusted to be a measuring range offline through the handheld operator, the output signal is changed into 4mA-20mA, and the generated pressure difference effect is counteracted.
Specifically, the capillary 6 is filled with silicone oil, and the silicone oil is filled in the capillary to transmit pressure.
The working principle and the using process of the invention are as follows: the method of adopting the double-pressure-guiding type differential liquid level transmitter is characterized in that two source measuring points are connected to two different heights of a pressure container, the pressure difference at the source measuring element is converted into the height of a pressure container page, and a pressure signal is transmitted to the diaphragm type pressure transmitter through a capillary tube by a flat diaphragm double flange and a connecting diaphragm flange, so that the height of the liquid level of the pressure container is directly read, and the level of a medium with the characteristics of corrosivity, high viscosity, easy crystallization and low freezing point can be measured; the method has the characteristics of high sensitivity and stable signal processing, and can cope with various process conditions; the device has the advantages of simple structure, high accuracy, convenient installation and maintenance and easy combination into a control system, and is used for continuously measuring the liquid level of pressure vessels such as towers, tanks and the like in the continuous or intermittent production process.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The phrase "comprising a defined element does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A pressure vessel liquid level measurement device which characterized in that: the pressure vessel comprises a pressure vessel (1) and a high pressure taking pipe (9) and a low pressure taking pipe (10) which are fixedly connected with the pressure vessel (1) at different heights, wherein the input end of the high pressure taking pipe (9) is connected with the pressure vessel (1), the output end of the high pressure taking pipe (9) is fixedly connected with a negative pressure chamber flange ball valve (2) and is connected with the input end of the negative pressure chamber flange ball valve (2), the output end of the negative pressure chamber flange ball valve (2) is connected with a capillary (6) through a negative pressure chamber connecting diaphragm flange (4), and the output end of the capillary (6) is connected with a diaphragm type differential pressure transmitter (8) through three groups of valves (7);
the input end of the low pressure sampling pipe (10) is connected with the pressure container (1), the output end of the low pressure sampling pipe (10) is fixedly connected with a positive pressure chamber flange ball valve (3) and is connected with the input end of the positive pressure chamber flange ball valve (3), the output end of the positive pressure chamber flange ball valve (3) is connected with the output end of the capillary tube (6) through a positive pressure chamber connecting membrane flange (5), and the output end of the capillary tube (6) is connected with the input end of the diaphragm type differential pressure transmitter (8) through the three groups of valves (7).
2. A pressure vessel level measurement apparatus as claimed in claim 1, wherein: the three groups of valves (7) are fixedly provided with measuring gauge heads, and the capillary tube (6) is used for connecting the negative pressure chamber with the diaphragm flange (4), connecting the positive pressure chamber with the diaphragm flange (5) and connecting the measuring gauge heads.
3. A pressure vessel level measurement apparatus as claimed in claim 1, wherein: the high pressure taking pipe (9) and the low pressure taking pipe (10) are respectively installed at different heights on the pressure container (1), and the high pressure taking pipe (9) and the low pressure taking pipe (10) are both made of SS316L stainless steel.
4. A pressure vessel level measurement apparatus as claimed in claim 1, wherein: the negative pressure chamber connecting diaphragm flange (4) and the positive pressure chamber connecting diaphragm flange (5) are both of a flat diaphragm double-flange structure.
5. A pressure vessel level measurement apparatus as claimed in claim 1, wherein: the pressure of the positive pressure chamber in the pressure container (1) is P1＝ρ2gh1+ρ1gH+P0Pressure of the negative pressure chamber is P2＝ρ2gh2+P0。
6. A pressure vessel level measurement apparatus as claimed in claim 1, wherein: when the diaphragm type differential pressure transmitter (8) and the low pressure taking point of the pressure container (1) are arranged on the same horizontal plane, the range of differential pressure delta P measured by the differential pressure transmitter is [ 0-rho ]1gHmax]。
7. A pressure vessel level measurement apparatus as claimed in claim 1, wherein: the installation position of the diaphragm type differential pressure transmitter (8) is not on the same horizontal plane with the lowest liquid level, the distance between the horizontal position of the diaphragm type differential pressure transmitter (8) and the low pressure taking point of the pressure container (1) is h1, and the range of differential pressure delta P measured by the diaphragm type differential pressure transmitter (8) is [ rho1gh1～(ρ1gHmax+ρ1gh1)]And the zero point of the diaphragm type differential pressure transmitter (8) is positively shifted.
8. A pressure vessel level measurement apparatus as claimed in claim 1, wherein: the installation position of the diaphragm type differential pressure transmitter (8) is not on the same horizontal plane with the lowest liquid level, when isolation liquid is respectively filled between a positive pressure chamber and a negative pressure chamber of the diaphragm type differential pressure transmitter (8) and a pressure taking point on the pressure container (1), the range of differential pressure delta P measured by the diaphragm type differential pressure transmitter (8) is { -rho2g(h2-h1)～[ρ1gHmax-ρ2g(h2-h1)]And the zero point of the diaphragm type differential pressure transmitter (8) is subjected to negative migration.
9. A pressure vessel level measurement apparatus as claimed in claim 2, wherein: the measuring gauge head can be fixedly arranged on an on-site heat preservation protection box or a mounting bracket, the connection mode is a standard electrical interface and is used for transmitting 4-20mA signals, and a liquid crystal display panel is arranged on the measuring gauge head.
10. A pressure vessel level measurement apparatus as claimed in claim 2, wherein: the capillary (6) is filled with silicone oil.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010930524.6A CN111912491A (en) | 2020-09-07 | 2020-09-07 | Liquid level measuring device for pressure container |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010930524.6A CN111912491A (en) | 2020-09-07 | 2020-09-07 | Liquid level measuring device for pressure container |
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| CN111912491A true CN111912491A (en) | 2020-11-10 |
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| CN202010930524.6A Pending CN111912491A (en) | 2020-09-07 | 2020-09-07 | Liquid level measuring device for pressure container |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112729482A (en) * | 2020-12-21 | 2021-04-30 | 赣州久创科技有限公司 | Automatic verification system for oiling machine |
| CN112729483A (en) * | 2020-12-21 | 2021-04-30 | 赣州久创科技有限公司 | Oil storage tank body for automatic calibrating device of oiling machine |
| CN113911581A (en) * | 2021-10-26 | 2022-01-11 | 大庆市镁华仪仪表衡器有限公司 | Instrument electronic integrated transmitter |
-
2020
- 2020-09-07 CN CN202010930524.6A patent/CN111912491A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112729482A (en) * | 2020-12-21 | 2021-04-30 | 赣州久创科技有限公司 | Automatic verification system for oiling machine |
| CN112729483A (en) * | 2020-12-21 | 2021-04-30 | 赣州久创科技有限公司 | Oil storage tank body for automatic calibrating device of oiling machine |
| CN113911581A (en) * | 2021-10-26 | 2022-01-11 | 大庆市镁华仪仪表衡器有限公司 | Instrument electronic integrated transmitter |
| CN113911581B (en) * | 2021-10-26 | 2022-04-26 | 大庆市镁华仪仪表衡器有限公司 | Instrument electronic integrated transmitter |
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