CN112197835A - Method for preventing instrument from being blocked - Google Patents
Method for preventing instrument from being blocked Download PDFInfo
- Publication number
- CN112197835A CN112197835A CN202011173016.4A CN202011173016A CN112197835A CN 112197835 A CN112197835 A CN 112197835A CN 202011173016 A CN202011173016 A CN 202011173016A CN 112197835 A CN112197835 A CN 112197835A
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- Prior art keywords
- concentration
- absorption
- absorption tower
- liquid
- short pipe
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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
- G01F23/16—Indicating, recording, or alarm devices being actuated by mechanical or fluid means, e.g. using gas, mercury, or a diaphragm as transmitting element, or by a column of liquid
- G01F23/164—Indicating, recording, or alarm devices being actuated by mechanical or fluid means, e.g. using gas, mercury, or a diaphragm as transmitting element, or by a column of liquid using a diaphragm, bellow as transmitting element
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a method for preventing an instrument from being blocked, which is realized by the following steps; step one; adding low-concentration absorption liquid into an absorption tower through an absorption pump; introducing ammonia gas and carbon dioxide gas into the absorption tower; step two; absorbing gas containing ammonia and carbon dioxide in the absorption tower by the absorption liquid to form high-concentration ammonium carbamate liquid; step three; the liquid level and pressure inside the absorption column are measured at the short pipe by a meter: step four; diluting the high-concentration methylamine liquid at the short pipe, and preventing the high-concentration methylamine liquid from crystallizing on the surface of the pressure measuring diaphragm; and step five, closing the valve when the concentration of the ammonium carbamate solution in the absorption tower is low, and stopping diluting the ammonium carbamate solution at the short pipe. The invention relates to the technical field of instrument anti-blocking. The method for preventing the instrument from being blocked solves the problem that in the prior art, because the crystallization temperature of the ammonium carbamate solution is higher, crystals are easily formed on the pressure measuring diaphragm, and the measurement data is inaccurate.
Description
Technical Field
The invention relates to the technical field of instrument blockage prevention, in particular to a method for preventing an instrument from being blocked.
Background
In the production process of the urea, absorption liquid with lower concentration is added into an absorption tower through an absorption pump, gas containing ammonia and carbon dioxide is absorbed in the absorption tower to form high-concentration ammonium carbamate liquid, and as the concentration of a process medium is higher, the crystallization temperature is also higher, most of the process medium is higher than the normal temperature, and the crystallization temperature of part of the process medium reaches more than 130 ℃.
Because the crystallization temperature of the ammonium carbamate solution is high, crystallization is easily formed on the pressure measuring diaphragm, liquid level measurement is inaccurate, and the instrument conduit and the diaphragm crystallization which cause pressure and liquid level measurement cannot be measured in serious cases, so that the accuracy and the reliability of instrument measurement are influenced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for preventing an instrument from being blocked, and solves the problem that in the prior art, because the crystallization temperature of ammonium carbamate liquid is higher, crystals are easily formed on a pressure measuring diaphragm, and the liquid level measurement is inaccurate.
In order to achieve the purpose, the invention is realized by the following technical scheme: a method of preventing clogging of a meter, the method being carried out by the steps of;
step one; adding low-concentration absorption liquid into an absorption tower through an absorption pump; introducing ammonia gas and carbon dioxide gas into the absorption tower;
step two; absorbing gas containing ammonia and carbon dioxide in the absorption tower by the absorption liquid to form high-concentration ammonium carbamate liquid;
step three; the liquid level and pressure inside the absorption column are measured at the short pipe by a meter:
step four; diluting the high-concentration methylamine liquid at the short pipe, and preventing the high-concentration methylamine liquid from crystallizing on the surface of the pressure measuring diaphragm;
and step five, closing the valve when the concentration of the ammonium carbamate solution in the absorption tower is low, and stopping diluting the ammonium carbamate solution at the short pipe.
Preferably: diluting the high-concentration methylamine liquid at the short pipe in the fourth step specifically;
a: when the concentration of the ammonium carbamate solution in the absorption tower is lower than 70%, a branch pipe is led out from an outlet pipeline of the absorption pump and connected to a short pipe in front of a pressure measuring diaphragm, and a part of low-concentration absorption solution is added into the absorption tower from the short pipe in front of the diaphragm through the branch pipe;
b: when the concentration of the ammonium carbamate solution in the absorption tower is higher than 70% and the crystallization of the pressure measuring diaphragm cannot be completely avoided, a guide pipe is connected to the short pipe in front of the pressure measuring diaphragm, and a proper amount of desalted water is added into the absorption tower from the short pipe in front of the diaphragm through the guide pipe.
Preferably: and the valve in the fifth step is a stop valve arranged in the branch pipe and the guide pipe.
Preferably: in the third step, the liquid level and the pressure inside the absorption tower are measured at the short pipe through an instrument; and the instrument guide pipe and the pressure measuring diaphragm are communicated with the right side of the short pipe, and the pressure and the liquid level inside the absorption tower are measured through the pressure measuring diaphragm and the instrument guide pipe.
Preferably: the temperature of the desalted water is controlled at 170-175 ℃.
Advantageous effects
The invention provides a method for preventing a meter from being blocked. The method has the following beneficial effects:
(1) the method for preventing the instrument from being blocked comprises the steps that absorption liquid with low concentration is led into the short pipe through the branch pipe, or desalted water is led into the short pipe through the guide pipe, the absorption liquid around the pressure measuring diaphragm is diluted, the problem that the medium around the pressure measuring diaphragm cannot be crystallized and blocked is solved, the pressure measuring diaphragm works normally, and the measurement is accurate.
(2) The method for preventing the instrument from being blocked is simple and rapid to operate, only two pipes and two valves are needed during operation, the method can be used repeatedly, and the cost is very low.
Drawings
FIG. 1 is a schematic diagram of the operation of the type A case in step four of the present invention;
FIG. 2 is a diagram illustrating the operation of the type B case in step four of the present invention.
In the figure: 1 absorption tower, 2 absorption pumps, 3 short pipes, 4 pressure measuring diaphragms, 5 branch pipes, 6 valves and 7 guide pipes.
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 a technical solution: a method of preventing clogging of a meter, the method being carried out by the steps of;
step one; adding low-concentration absorption liquid into an absorption tower through an absorption pump; introducing ammonia gas and carbon dioxide gas into the absorption tower;
step two; absorbing gas containing ammonia and carbon dioxide in the absorption tower by the absorption liquid to form high-concentration ammonium carbamate liquid;
step three; the liquid level and pressure inside the absorption column are measured at the short pipe by a meter:
step four; diluting the high-concentration methylamine liquid at the short pipe, and preventing the high-concentration methylamine liquid from crystallizing on the surface of the pressure measuring diaphragm;
and step five, closing the valve when the concentration of the ammonium carbamate solution in the absorption tower is low, and stopping diluting the ammonium carbamate solution at the short pipe.
Further: diluting the high-concentration methylamine liquid at the short pipe in the fourth step specifically;
a: when the concentration of the ammonium carbamate solution in the absorption tower is lower than 70%, a branch pipe is led out from an outlet pipeline of the absorption pump and connected to a short pipe in front of a pressure measuring diaphragm, and a part of low-concentration absorption solution is added into the absorption tower from the short pipe in front of the diaphragm through the branch pipe;
b: when the concentration of the ammonium carbamate solution in the absorption tower is higher than 70% and the crystallization of the pressure measuring diaphragm cannot be completely avoided, a guide pipe is connected to the short pipe in front of the pressure measuring diaphragm, and a proper amount of desalted water is added into the absorption tower from the short pipe in front of the diaphragm through the guide pipe.
Further: and the valve in the fifth step is a stop valve arranged in the branch pipe and the guide pipe.
Further: in the third step, the liquid level and the pressure inside the absorption tower are measured at the short pipe through an instrument; and the instrument guide pipe and the pressure measuring diaphragm are communicated with the right side of the short pipe, and the pressure and the liquid level inside the absorption tower are measured through the pressure measuring diaphragm and the instrument guide pipe.
Further: the temperature of the desalted water is controlled at 170-175 ℃.
The first embodiment; as shown in fig. 1, in order to avoid the formation of crystals on the surface of the pressure measuring diaphragm 4, a branch pipe 5 is communicated from the outlet pipe of the absorption pump 2, and the end of the branch pipe 5 is communicated with the short pipe 3 on the left side of the pressure measuring diaphragm 4, a part of the low-concentration absorption liquid directly enters the absorption tower from the short pipe 3 on the left side of the pressure measuring diaphragm 4 through the branch pipe 5, the periphery of the pressure measuring diaphragm 4 is filled with the low-concentration liquid, and the problems that the concentration of the absorption liquid around the pressure measuring diaphragm 4 is high, crystals are generated, and the surface attached to the pressure measuring diaphragm 4 affects.
Example two; as shown in fig. 2, when the concentration of the absorption liquid is high and the crystallization of the pressure measuring diaphragm cannot be completely avoided, a guide pipe 7 can be connected to the short pipe 3 on the left side of the pressure measuring diaphragm 4, a proper amount of desalted water is added into the short pipe 3 through the guide pipe 7, the absorption liquid around the pressure measuring diaphragm 4 is diluted, the problem that the medium around the pressure measuring diaphragm 4 cannot be crystallized and blocked is solved, and the pressure measuring diaphragm is ensured to work normally.
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.
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 (5)
1. A method of preventing clogging of a meter, comprising: the method is realized by the following steps;
step one; adding low-concentration absorption liquid into an absorption tower through an absorption pump; introducing ammonia gas and carbon dioxide gas into the absorption tower;
step two; absorbing gas containing ammonia and carbon dioxide in the absorption tower by the absorption liquid to form high-concentration ammonium carbamate liquid;
step three; the liquid level and pressure inside the absorption column are measured at the short pipe by a meter:
step four; diluting the high-concentration methylamine liquid at the short pipe, and preventing the high-concentration methylamine liquid from crystallizing on the surface of the pressure measuring diaphragm;
and step five, closing the valve when the concentration of the ammonium carbamate solution in the absorption tower is low, and stopping diluting the ammonium carbamate solution at the short pipe.
2. The method of preventing meter plugging of claim 1, wherein: diluting the high-concentration methylamine liquid at the short pipe in the fourth step specifically;
a: when the concentration of the ammonium carbamate solution in the absorption tower is lower than 70%, a branch pipe is led out from an outlet pipeline of the absorption pump and connected to a short pipe in front of a pressure measuring diaphragm, and a part of low-concentration absorption solution is added into the absorption tower from the short pipe in front of the diaphragm through the branch pipe;
b: when the concentration of the ammonium carbamate solution in the absorption tower is higher than 70% and the crystallization of the pressure measuring diaphragm cannot be completely avoided, a guide pipe is connected to the short pipe in front of the pressure measuring diaphragm, and a proper amount of desalted water is added into the absorption tower from the short pipe in front of the diaphragm through the guide pipe.
3. The method of preventing meter plugging of claim 1, wherein: and the valve in the fifth step is a stop valve arranged in the branch pipe and the guide pipe.
4. The method of preventing meter plugging of claim 1, wherein: in the third step, the liquid level and the pressure inside the absorption tower are measured at the short pipe through an instrument; and the instrument guide pipe and the pressure measuring diaphragm are communicated with the right side of the short pipe, and the pressure and the liquid level inside the absorption tower are measured through the pressure measuring diaphragm and the instrument guide pipe.
5. A method of preventing meter plugging according to claim 2, wherein: the temperature of the desalted water is controlled at 170-175 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011173016.4A CN112197835A (en) | 2020-10-28 | 2020-10-28 | Method for preventing instrument from being blocked |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011173016.4A CN112197835A (en) | 2020-10-28 | 2020-10-28 | Method for preventing instrument from being blocked |
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| Publication Number | Publication Date |
|---|---|
| CN112197835A true CN112197835A (en) | 2021-01-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011173016.4A Pending CN112197835A (en) | 2020-10-28 | 2020-10-28 | Method for preventing instrument from being blocked |
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| CN (1) | CN112197835A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104296827A (en) * | 2014-10-30 | 2015-01-21 | 安徽金禾实业股份有限公司 | Anti-crystallization liquid level meter |
| CN207113966U (en) * | 2017-08-31 | 2018-03-16 | 北京金隅琉水环保科技有限公司 | A kind of liquid level gauge and crystallizer |
| CN207280547U (en) * | 2017-10-20 | 2018-04-27 | 中国石油天然气股份有限公司长庆石化分公司 | Utilize the device of the double Flange changer measurement alkaline residue tank liquid levels of high-temperature steam |
| CN208254589U (en) * | 2018-05-08 | 2018-12-18 | 贵州开磷集团矿肥有限责任公司 | A kind of closed container high viscosity crystallization medium liquid level emasuring device |
| CN109381988A (en) * | 2018-12-27 | 2019-02-26 | 山东盛宝传热科技有限公司 | A kind of device preventing ammonia process desulfuration tower Crystallization Plugging |
-
2020
- 2020-10-28 CN CN202011173016.4A patent/CN112197835A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104296827A (en) * | 2014-10-30 | 2015-01-21 | 安徽金禾实业股份有限公司 | Anti-crystallization liquid level meter |
| CN207113966U (en) * | 2017-08-31 | 2018-03-16 | 北京金隅琉水环保科技有限公司 | A kind of liquid level gauge and crystallizer |
| CN207280547U (en) * | 2017-10-20 | 2018-04-27 | 中国石油天然气股份有限公司长庆石化分公司 | Utilize the device of the double Flange changer measurement alkaline residue tank liquid levels of high-temperature steam |
| CN208254589U (en) * | 2018-05-08 | 2018-12-18 | 贵州开磷集团矿肥有限责任公司 | A kind of closed container high viscosity crystallization medium liquid level emasuring device |
| CN109381988A (en) * | 2018-12-27 | 2019-02-26 | 山东盛宝传热科技有限公司 | A kind of device preventing ammonia process desulfuration tower Crystallization Plugging |
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Application publication date: 20210108 |