CN110954285A - Method for detecting leakage of Freon evaporator - Google Patents
Method for detecting leakage of Freon evaporator Download PDFInfo
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- CN110954285A CN110954285A CN201811171197.XA CN201811171197A CN110954285A CN 110954285 A CN110954285 A CN 110954285A CN 201811171197 A CN201811171197 A CN 201811171197A CN 110954285 A CN110954285 A CN 110954285A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3236—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers
- G01M3/3272—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers for verifying the internal pressure of closed containers
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Abstract
The invention relates to a method for detecting leakage of a Freon evaporator. A method for detecting the leakage of a Freon evaporator comprises the following steps: closing a liquid phase inlet valve of the Freon evaporator, and isolating the evaporator from a Freon system after the Freon liquid phase in the evaporator is gasified; the operating pressure of the material side of each Freon evaporator is kept unchanged, the operation is waited for 0.5h, gas phase samples are taken from each evaporator and a Freon system main pipe to carry out component analysis, the gas phase samples of the Freon system main pipe are taken as reference samples, wherein the difference between the result of one sample and the reference sample is the largest, and the evaporator is a leakage evaporator. According to the method for detecting the leakage of the Freon evaporator, the leakage evaporator is accurately and effectively found by performing component analysis comparison on a single Freon evaporator, so that damage is reduced; and greatly shortens the judgment time of the leakage evaporator, saves the time for processing faults and accelerates the speed of restoring production.
Description
Technical Field
The invention belongs to the technical field of polycrystalline silicon, and particularly relates to a method for detecting leakage of a Freon evaporator.
Background
The total number of evaporators which utilize Freon as a refrigerant to cool materials in the polycrystalline silicon CDI unit is 4, the heating media of the evaporators are materials which show acidity when meeting water, and the heating media mainly comprise chlorosilane, hydrogen chloride and hydrogen. The Freon evaporator is used for decompressing high-pressure Freon liquid into Freon gas phase, and the phase change is generated in the process to release cold energy, so that the refrigerating effect is achieved. This in-process gaseous phase freon is in the negative pressure environment, if send out biological material side and evaporimeter tubulation and leak, evaporimeter tube shell side material high-pressure side will move to the low pressure side to lead to the acid material to get into shell side freon system in the tube side, make freon system become acid by the neutrality, freon compressor lubricating oil also can be polluted for the acid simultaneously, reduce its lubricating property, influence the life or the direct damage of freon compressor, influence production stability and increase the plant maintenance cost. If the Freon evaporator leaks, after the Freon system is found to be changed from neutrality to acidity, the method for quickly and accurately judging the evaporator leakage is very favorable for reducing the risk of equipment damage and reducing the influence on the yield of polycrystalline silicon.
The conventional method for checking the leakage of the evaporator comprises the steps of replacing 1 Freon evaporator material side to be qualified, disassembling an evaporator end socket, pressurizing by using nitrogen on the Freon side, performing an airtight experiment to judge whether the evaporator leaks, and after confirming that the evaporator does not leak, continuously judging the next evaporator by using the method until all evaporators are judged to be finished and all leaked evaporators are judged. However, this method is very time consuming, and all evaporators must be replaced in a qualified manner, and an airtight test is performed to effectively determine the leaking evaporator, and the production is resumed after maintenance. In the long-time judgment process, CDI units, which are indispensable in polysilicon production, must stop operating, that is, all polysilicon production units should be stopped for waiting, which has a great influence, and the yield and cost of polysilicon are directly affected.
In view of the above, the present invention provides a method for detecting the leakage of a freon evaporator, which is fast and accurate, and greatly shortens the judgment time, thereby reducing the influence on the yield and the cost of polysilicon.
Disclosure of Invention
The invention aims to provide a method for detecting leakage of a Freon evaporator, which accurately judges the leaked Freon evaporator by performing component analysis and comparison on a single Freon evaporator and greatly shortens the judgment time of the leaked evaporator.
In order to realize the purpose, the adopted technical scheme is as follows:
a method for detecting the leakage of a Freon evaporator comprises the following steps:
closing a liquid phase inlet valve of the Freon evaporator, and isolating the evaporator from a Freon system after the Freon liquid phase in the evaporator is gasified;
the operating pressure of the material side of each Freon evaporator is kept unchanged, the operation is waited for 0.5h, gas phase samples are taken from each evaporator and a Freon system main pipe to carry out component analysis, the gas phase samples of the Freon system main pipe are taken as reference samples, wherein the difference between the result of one sample and the reference sample is the largest, and the evaporator is a leakage evaporator.
Further, before the evaporator is isolated from the Freon system, the Freon compressor is operated;
after the evaporator is isolated from the Freon system, the operation of the Freon compressor is stopped.
Further, the component analysis is as follows: and analyzing the contents of hydrogen chloride, chlorosilane and hydrogen in the obtained gas-phase sample.
Further, the detection method further comprises: after the evaporator with leakage is maintained, detecting whether the Freon in the Freon system is neutral or not, if so, repeating the detection steps of claim 1, and judging the evaporator with leakage.
Compared with the prior art, the invention has the beneficial effects that:
the invention relates to a method for detecting the leakage of a Freon evaporator, which comprises the steps of after isolating the Freon side of each evaporator from a Freon system, analyzing the sampling components of a gas phase medium at the Freon side of each evaporator under the condition that the operating pressure state of a material side is not changed, and taking a gas sample of the Freon system as a reference. The evaporator that leaks takes place in equal isolation time, and the material medium concentration of freon side will rise, compares through the analysis result, will can be accurate and effectual judgement leak the evaporator. Compared with the traditional judgment method, the leakage evaporator is accurately and effectively found, and the damage of the changed acidic Freon environment to the Freon compressor is reduced; and greatly shortens the judgment time of the leakage evaporator, saves the time for processing faults, accelerates the speed of restoring production and improves the yield of polycrystalline silicon.
Drawings
FIG. 1 is a schematic view of a Freon vaporizer; in the figure, 1 is a liquid-phase Freon inlet, 2 is a gas-phase Freon outlet, 3 is a material inlet, and 4 is a material outlet.
Detailed Description
In order to further illustrate the method for detecting the leakage of a freon evaporator of the present invention and achieve the desired objects, the following embodiments are combined with the preferred embodiments to provide a method for detecting the leakage of a freon evaporator, the detailed description of the embodiments, the structure, the features and the effects thereof. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The method for detecting the leakage of a Freon evaporator according to the present invention will be described in further detail with reference to FIG. 1 and the following embodiment:
with reference to the schematic diagram of the Freon evaporator in FIG. 1, the technical scheme of the invention is as follows:
in the operation process of the CDI unit, after the Freon in the Freon system is changed from neutrality to acidity, liquid-phase inlet valves of all Freon evaporators are closed in time, and the Freon compressor is in an operation state at the moment.
And after the Freon liquid phase in the evaporator is gasified, closing the Freon gas phase outlet valves of the evaporators in sequence, isolating the evaporators from the Freon system, and stopping the Freon compressor.
The operating pressure on the material side of each freon evaporator is kept constant. Waiting for 0.5h, taking a gas phase sample at each evaporator for component analysis, and taking the gas phase sample at the main pipe of the Freon system as a reference. According to the composition of the polycrystalline silicon CDI unit material, the content of hydrogen chloride, chlorosilane and hydrogen in a sample can be analyzed. One of the sample results that most differs from the reference will be the evaporator that is leaking.
After the material side of the leaking evaporator is subjected to pressure relief and replacement, an evaporator end socket is removed, a nitrogen pressure test is carried out on a tube pass to find a leaking tube array, after the leaking tube array is maintained, whether Freon in a Freon system is neutral is detected, if the Freon in the Freon system is acidic, the detection steps of claim 1 are repeated, and the leaking evaporator is judged; if the product is neutral, the production can be recovered.
Example 1.
The polycrystalline silicon CDI unit is respectively provided with 4 Freon evaporators, the bit numbers are respectively E05, E08, E11 and E16, the 4 evaporators all adopt Freon as a refrigerant, the operation environment of the Freon is negative pressure, the heat medium materials mainly comprise chlorosilane, hydrogen chloride and hydrogen, and the operation pressure is more than 0.5 MPa. Upon discovering that the gaseous freon system suddenly changed from neutral to acidic, it was concluded that material leakage occurred in at least one of the 4 evaporators.
Immediately closing liquid phase Freon inlet valves of the 4 Freon evaporators, respectively closing the evaporator outlet valves after the evaporation of the liquid phase Freon is finished, isolating the evaporators from a Freon system, and simultaneously stopping running the Freon compressor.
After waiting for 0.5h, respectively taking gas samples at E05, E08, E11 and E16 and a Freon gas sample at the outlet of a Freon compressor, analyzing the contents of chlorosilane, hydrogen chloride and hydrogen in the samples and comparing the contents, wherein the analysis results are as follows:
| number of bits | Hydrogen content | Hydrogen chloride content | Chlorosilane content |
| Freon compressor | 0.03％ | Not detected out | Not detected out |
| E05 | 0.02％ | Not detected out | Not detected out |
| E08 | 0.02％ | Not detected out | Not detected out |
| E11 | 0.12％ | 3.68％ | 0.02％ |
| E16 | 0.01％ | Not detected out | Not detected out |
From the above analysis results, it was easy to see that the E11 evaporator had abnormal composition samples, and it was judged that the evaporator had a leak. Carry out the nitrogen gas replacement to E11 evaporimeter material side immediately and qualified after, maintenance personal dismantles its tube side head, fills nitrogen gas pressurization to the freon side simultaneously and makes airtight experiment preparation, opens the back at the head, through airtight experiment, discovers that there is a tubulation to damage, causes the leakage, carries out the shutoff to it immediately and keeps apart, changes freon and freon compressor lubricating oil in the freon system afterwards. After operation, the freon system is normal.
In the leakage process, the time for qualified replacement, seal head removal and airtight experiments on the E11 is about 10 hours, if the judgment is carried out according to a conventional method, under the condition that maintenance personnel are certain and airtight experiment equipment is certain, the remaining three evaporators sequentially judge that 30 hours are needed. Calculated according to 5000T annual output of polycrystalline silicon capacity designed by a single CDI system, the polycrystalline silicon output is increased by 20T within 30h, and the sales income is increased by 260 ten thousand yuan according to the current market quotation of 13 ten thousand yuan/ton.
According to the method for detecting the leakage of the Freon evaporator, after the Freon side of each evaporator is isolated from a Freon system, under the condition that the operating pressure state of the material side is not changed, the sampling components of the gas phase medium on the Freon side of each evaporator are analyzed, and meanwhile, a gas sample of the Freon system is taken as a reference. The evaporator that leaks takes place in equal isolation time, and the material medium concentration of freon side will rise, compares through the analysis result, will can be accurate and effectual judgement leak the evaporator. Compared with the traditional judgment method, the leakage evaporator is accurately and effectively found, and the damage of the changed acidic Freon environment to the Freon compressor is reduced; and greatly shortens the judgment time of the leakage evaporator, saves the time for processing faults, accelerates the speed of restoring production and improves the yield of polycrystalline silicon.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (4)
1. A method for detecting the leakage of a Freon evaporator is characterized by comprising the following steps:
closing a liquid phase inlet valve of the Freon evaporator, and isolating the evaporator from a Freon system after the Freon liquid phase in the evaporator is gasified;
the operating pressure of the material side of each Freon evaporator is kept unchanged, the operation is waited for 0.5h, gas phase samples are taken from each evaporator and a Freon system main pipe to carry out component analysis, the gas phase samples of the Freon system main pipe are taken as reference samples, wherein the difference between the result of one sample and the reference sample is the largest, and the evaporator is a leakage evaporator.
2. The detection method according to claim 1, wherein,
before the evaporator is isolated from the Freon system, the Freon compressor is operated;
after the evaporator is isolated from the Freon system, the operation of the Freon compressor is stopped.
3. The detection method according to claim 1, wherein,
the component analysis is as follows: and analyzing the contents of hydrogen chloride, chlorosilane and hydrogen in the obtained gas-phase sample.
4. The detection method according to claim 1, wherein,
the detection method further comprises the following steps: after the evaporator with leakage is maintained, detecting whether the Freon in the Freon system is neutral or not, if so, repeating the detection steps of claim 1, and judging the evaporator with leakage.
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| CN201811171197.XA CN110954285A (en) | 2018-10-09 | 2018-10-09 | Method for detecting leakage of Freon evaporator |
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| CN201811171197.XA CN110954285A (en) | 2018-10-09 | 2018-10-09 | Method for detecting leakage of Freon evaporator |
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Citations (8)
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| US5351500A (en) * | 1993-12-03 | 1994-10-04 | Texas Medical Center Central Heating And Cooling Cooperative Association | Refrigerant leak detector system |
| US5398543A (en) * | 1992-07-08 | 1995-03-21 | Hitachi Building Equipment Engineering Co., Ltd. | Method and apparatus for detection of vacuum leak |
| CN1350178A (en) * | 2000-10-19 | 2002-05-22 | 开利公司 | Absorptive-refrigerator leak detection and location, and hydrogen-storage battery inspection |
| KR20050121101A (en) * | 2004-06-21 | 2005-12-26 | 기아자동차주식회사 | A crack detecting apparatus in vehicle fuel tank |
| CN104913886A (en) * | 2015-04-17 | 2015-09-16 | 温州市特种设备检测研究院 | New method for leakage detection of Freon valve |
| CN106323561A (en) * | 2015-07-08 | 2017-01-11 | 湖北三宁化工股份有限公司 | Cooler on-line leakage detection system |
| CN106440502A (en) * | 2016-11-28 | 2017-02-22 | 哈尔滨工大金涛科技股份有限公司 | Blast furnace slag-washing water waste heat refrigerating device |
| CN207123358U (en) * | 2017-07-18 | 2018-03-20 | 智胜化工股份有限公司 | A kind of leakage detection device of air of heat transmission equipment |
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2018
- 2018-10-09 CN CN201811171197.XA patent/CN110954285A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5398543A (en) * | 1992-07-08 | 1995-03-21 | Hitachi Building Equipment Engineering Co., Ltd. | Method and apparatus for detection of vacuum leak |
| US5351500A (en) * | 1993-12-03 | 1994-10-04 | Texas Medical Center Central Heating And Cooling Cooperative Association | Refrigerant leak detector system |
| CN1350178A (en) * | 2000-10-19 | 2002-05-22 | 开利公司 | Absorptive-refrigerator leak detection and location, and hydrogen-storage battery inspection |
| KR20050121101A (en) * | 2004-06-21 | 2005-12-26 | 기아자동차주식회사 | A crack detecting apparatus in vehicle fuel tank |
| CN104913886A (en) * | 2015-04-17 | 2015-09-16 | 温州市特种设备检测研究院 | New method for leakage detection of Freon valve |
| CN106323561A (en) * | 2015-07-08 | 2017-01-11 | 湖北三宁化工股份有限公司 | Cooler on-line leakage detection system |
| CN106440502A (en) * | 2016-11-28 | 2017-02-22 | 哈尔滨工大金涛科技股份有限公司 | Blast furnace slag-washing water waste heat refrigerating device |
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Application publication date: 20200403 |