CN202735073U - Safety valve thermal-state test device - Google Patents
Safety valve thermal-state test device Download PDFInfo
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- CN202735073U CN202735073U CN201220302086XU CN201220302086U CN202735073U CN 202735073 U CN202735073 U CN 202735073U CN 201220302086X U CN201220302086X U CN 201220302086XU CN 201220302086 U CN201220302086 U CN 201220302086U CN 202735073 U CN202735073 U CN 202735073U
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Abstract
The utility model relates to a safety valve thermal-state test device, which comprises a power unit, a heat storage unit and a test unit, wherein the power unit is used for generating saturated steam and comprises a first steam outlet; the heat storage unit comprises a second steam inlet and a second steam outlet, and the second steam inlet is communicated with the first steam outlet; and the test unit comprises a third steam inlet and a third steam outlet, the third steam inlet is communicated with the second steam outlet, and the third steam outlet is communicated with a tested safety valve.
Description
Technical field
The utility model relates to test unit, more particularly, relates to a kind of safety valve test device.
Background technology
Safety valve is the working pressure automatic open close according to pressure system, generally is installed on protection system safety on the equipment of closed system or the pipeline.When equipment or manifold pressure surpass safety valve setting pressure, automatically open pressure release, guarantee that pressure medium is under set pressure in the e-quipment and pipe, the normal operation of protection e-quipment and pipe prevents accident, reduces the loss.
Safety valve thermal type approval test device adopts steam as test(ing) medium, to detect the property indices of safety valve product quality.In the correlation technique a kind of safety valve thermal type approval test device mainly by the boiler that produces steam, linking to each other with boiler is used for the storage tank of splendid attire steam and links to each other with storage tank forming for the test chamber that tested safety valve is installed, its MCR steam flow is 4t/h.Yet during owing to safety valve action, the exhaust steam amount is large, and the safety valve thermal type approval test device in the correlation technique has the following disadvantages at least: the evaporation capacity for engine that (1) is required according to test, the type selecting of boiler capacity want enough large, and the project construction cost sharply increases; (2) because the discharge capacity scope is wider, cause small displacement when test, boiler can not economical operation; During large capacity test, boiler runs at full capacity can not satisfy again the needs that vapour is used in test; (3) according to related request, safety valve type approval test device is from boosting to working more than at least 4 hours, under such process conditions, the temperature of storage tank can slowly be cooled off, and the vapor liquid in the pressure decreased, storage tank changes into water, cause a large amount of heat energy loss, the wasting of resources.
The utility model content
The technical problems to be solved in the utility model is, for the above-mentioned deficiency in the correlation technique, provides a kind of improved safety valve thermal type approval test device.
The technical scheme that its technical matters that solves the utility model adopts is: construct a kind of safety valve thermal type approval test device, comprise power unit, thermal storage unit and test cell; Described power unit is for generation of saturated vapour, and comprises the first steam (vapor) outlet; Described thermal storage unit comprises the second steam inlet and the second steam (vapor) outlet, and this second steam inlet is connected with described the first steam (vapor) outlet; Described test cell comprises the 3rd steam inlet and the 3rd steam (vapor) outlet, and described the 3rd steam inlet is connected with described the second steam (vapor) outlet, and described the 3rd steam (vapor) outlet is connected with tested safety valve.
In safety valve thermal type approval test device described in the utility model, this safety valve thermal type approval test device also comprises variable valve, and this variable valve is arranged between described the second steam (vapor) outlet and described the 3rd steam inlet.
In safety valve thermal type approval test device described in the utility model, the steam that is flowed into test cell by described thermal storage unit through the ratio of the pressure reduction before and after the described variable valve throttling at 1.5:1 to the 3:1.
In safety valve thermal type approval test device described in the utility model, this safety valve thermal type approval test device also comprises flowmeter, and this flowmeter is arranged between described the second steam (vapor) outlet and described the 3rd steam inlet.
In safety valve thermal type approval test device described in the utility model, described variable valve is prepended to described flowmeter.
In safety valve thermal type approval test device described in the utility model, described thermal storage unit is in low-water level.
In safety valve thermal type approval test device described in the utility model, the water level of described thermal storage unit is positioned at below 30% of described thermal storage unit volume.
In safety valve thermal type approval test device described in the utility model, described power unit, described thermal storage unit and/or described test cell are respectively boiler, thermofor and/or test chamber.
The beneficial effects of the utility model are: compare with correlation technique, because the setting of thermal storage unit can reduce the project construction cost, improve test capability and energy savings.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the structural representation of the safety valve thermal type approval test device among some embodiment of the utility model.
Fig. 2 is the fundamental diagram of the variable valve of safety valve thermal type approval test device shown in Figure 1.
The s-i figure of Fig. 3 steam.
Embodiment
Below in conjunction with specific embodiment and Figure of description the utility model is described in further details.
Fig. 1 shows the safety valve thermal type approval test device 1 among some embodiment of the utility model, is used for tested safety valve 2 is detected, to detect the property indices of tested safety valve 2.Safety valve thermal type approval test device 1 can comprise boiler 10, the thermofor 20 that is connected with boiler 10 and the test chamber 30 that is connected with thermofor 20, and test chamber 30 is connected with tested safety valve 2.
In certain embodiments, boiler 10 is power unit, and for generation of saturated vapour, it comprises the first steam (vapor) outlet 11.Thermofor 20 is thermal storage unit, and it comprises that the second steam inlet 21 and the second steam (vapor) outlet 23, the second steam inlets 21 are connected with the first steam (vapor) outlet 11 of boiler 10.Test chamber 30 is test cell, and it comprises that the 3rd steam inlet 31 and the 3rd steam (vapor) outlet 33, the three steam inlets 31 are connected with the second steam (vapor) outlet 23, and the 3rd steam (vapor) outlet 33 is connected with tested safety valve 2.Be appreciated that ground, in certain embodiments, also can adopt other suitable power units, thermal storage unit and test cell.
In above-mentioned safety valve thermal type approval test device 1, because the existence of thermofor 20 has brought following plurality of advantages at least:
(1) reduces the project construction cost.The steam flow that 20 moments of thermofor can provide is doubly a lot of for boiler 10 steam flow that provides, so that the capacity requirements of type selecting of boiler 10 is much lower for correlation technique, and the cost of boiler 10 wants expensive a lot of compared with thermofor 20 usually, therefore, the setting of thermofor 20 greatly reduces the construction cost of whole project.
(2) improve test capability.In principle, thermofor 20 volumes are larger, and the energy of accumulation is more, and the quantity of steam that provides is more, more can satisfy the large requirement of tested safety valve 2 discharge capacitys, improve the test capability of safety valve thermal type approval test device 1.
(3) energy savings.
In certain embodiments, 1 pair of steam quality of safety valve thermal type approval test device (mass dryness fraction and the degree of superheat) is that strict requirement is arranged, to satisfy the requirement of some standards, for example, satisfy among the pressure relief device performances acceptance standard GB/T12242-2005 and a) stipulate: the datum situation of steam is dry saturated steam, the situation of pressure relief device inflow point steam should be minimum mass dryness fraction 98% in the test, 10 ℃ of the maximum degrees of superheat.
In certain embodiments, be the steam regulation mass dryness fraction, safety valve thermal type approval test device 1 also can comprise variable valve 50, again as shown in Figure 1, this variable valve 50 is arranged between the 3rd steam inlet 31 of the second steam (vapor) outlet 23 of thermofor 20 and test chamber 30, be used for the quantity delivered of control steam, and then reach the purpose of steam regulation mass dryness fraction.
Below in conjunction with principle of work to how utilizing variable valve 50 to come the steam regulation mass dryness fraction to elaborate:
At first, when steam flows, usually run into barrier (such as orifice plate, valve etc.) in pipeline.Steam makes the pressure decreased of gas and don't outwards acting by them, and the process that the fluid flow by pipeline is reduced, and is called " throttling " or blocking.Variable valve 50 namely utilizes this principle to regulate the pressure of fluid flow and reduction fluid.Next analyze the situation of change of steam condition in the throttling process.Because by throttle orifice, usually can ignore soon by the out-of-date institute of air flow stream dispersed heat for air-flow.Again because throttle orifice before and after pressure differential owing to friction, eddy current etc. cause, so throttling is a kind of irreversible adiabatic process.
As shown in Figure 2, selected cross section I-I and II-II before and after throttling use subscript " 1 " to represent the amount at I-I place, cross section, use subscript " 2 " to represent the amount at section II-II place, utilize the adiabatic steady flow formula, can get following relation:
C wherein
2Be the flow velocity after the throttling, when section II-II is selected in gas and not restarts to flow the place along the whole cross section of pipe, C
2=C
1And one of kinetic energy with i relatively also seems very little, thus the kinetic energy term in the following formula can ignore, thereby obtain i
1=i
2
As shown in Figure 3, during steam condition after determining throttling, can be on s-i figure before the steam throttling original state point m diversion horizontal line until and the pressure line after the throttling intersect, put n and be the state after the throttling.As seen from Figure 3, steam is after throttling, and the enthalpy drop that it can be used to do work under certain back pressure will reduce (h
1H
2), this is uneconomic, reduce the part (h
1H
2) be called " restriction loss ".In addition, the parameter before and after the water vapour throttling changes, also can be by finding on the s-i figure, i.e. and Δ P＜0; Δ i=0; Δ V〉0; Δ S〉0.Here, Δ V〉0, pressure drop also just is described, specific volume increases, and steam quality increases.This shows, variable valve 50 can be so that be entered the mass dryness fraction increase of the steam of test chamber 30 by thermofor 20.In certain embodiments, calculate by analysis, the ratio of pressure reduction reaches before and after throttling: when maximum 3:1, minimum 1.5:1, regulate through variable valve 50, can be so that the mass dryness fraction of steam rise, and its final steam quality can meet the demands.
In certain embodiments, safety valve thermal type approval test device 1 also can comprise flowmeter 60, this flowmeter 60 is arranged between thermofor 20 and the test chamber 30, be used for to measure and to enter the flow of the steam of test chamber 30 by thermofor 20, and then the steam flow can draw tested safety valve 2 earth pressure release the time.Preferably, flowmeter 60 is arranged between variable valve 50 and the test chamber 30, be that variable valve 50 is prepended to flowmeter, so that the flow value that flowmeter 60 records is the flow value that improves the steam after the mass dryness fractions through variable valve 50, so that the vapor stream value during tested safety valve 2 earth pressure release that obtains is more accurate.
In certain embodiments, thermofor 20 is in low water level operation, and preferably, this water level is at below 30% of volume (containing 30%) of thermofor 20, so that the mass dryness fraction of the steam that flows out from thermofor 20 is higher.So, be prepended to flowmeter 60 by thermofor 20 low water level operations and variable valve 50 and combine, can guarantee preferably to enter into the mass dryness fraction of the steam of test chamber 30, so that the check of tested safety valve 2 is more accurate.
In certain embodiments, safety valve thermal type approval test device 1 also can comprise valve 40, temperature sensor 70 and pressure transducer 80.Valve 40 arranges between boiler 10 and the thermofor 20, is used for control steam and flows into thermofor 20 by boiler 10.On the pipeline between variable valve 50 and the flowmeter 60 and on the test chamber 30 temperature sensor 70 and pressure transducer 80 are installed all, to detect respectively the temperature and pressure of steam.
The above only is preferred implementation of the present utility model, and protection domain of the present utility model also not only is confined to above-described embodiment, and all technical schemes that belongs under the utility model thinking all belong to protection domain of the present utility model.Should be pointed out that for those skilled in the art, in several improvements and modifications that do not break away under the utility model principle prerequisite, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (10)
1. a safety valve thermal type approval test device is characterized in that, comprises power unit, thermal storage unit and test cell; Described power unit is for generation of saturated vapour, and comprises the first steam (vapor) outlet; Described thermal storage unit comprises the second steam inlet and the second steam (vapor) outlet, and this second steam inlet is connected with described the first steam (vapor) outlet; Described test cell comprises the 3rd steam inlet and the 3rd steam (vapor) outlet, and described the 3rd steam inlet is connected with described the second steam (vapor) outlet, and described the 3rd steam (vapor) outlet is connected with tested safety valve.
2. safety valve thermal type approval test device according to claim 1 is characterized in that, this safety valve thermal type approval test device also comprises variable valve, and this variable valve is arranged between described the second steam (vapor) outlet and described the 3rd steam inlet.
3. safety valve thermal type approval test device according to claim 2 is characterized in that, the steam that is flowed into test cell by described thermal storage unit through the ratio of the pressure reduction before and after the described variable valve throttling at 1.5:1 to the 3:1.
4. safety valve thermal type approval test device according to claim 3 is characterized in that, this safety valve thermal type approval test device also comprises flowmeter, and this flowmeter is arranged between described the second steam (vapor) outlet and described the 3rd steam inlet.
5. safety valve thermal type approval test device according to claim 4 is characterized in that, described variable valve is prepended to described flowmeter.
6. safety valve thermal type approval test device according to claim 5 is characterized in that, described thermal storage unit is in low-water level.
7. safety valve thermal type approval test device according to claim 6 is characterized in that, the water level of described thermal storage unit is positioned at below 30% of described thermal storage unit volume.
8. safety valve thermal type approval test device according to claim 1 is characterized in that, described thermal storage unit is in low-water level.
9. safety valve thermal type approval test device according to claim 8 is characterized in that, the water level of described thermal storage unit is positioned at below 30% of described thermal storage unit volume.
10. each described safety valve thermal type approval test device is characterized in that according to claim 1-9, and described power unit, described thermal storage unit and/or described test cell are respectively boiler, thermofor and/or test chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220302086XU CN202735073U (en) | 2012-06-26 | 2012-06-26 | Safety valve thermal-state test device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220302086XU CN202735073U (en) | 2012-06-26 | 2012-06-26 | Safety valve thermal-state test device |
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| CN202735073U true CN202735073U (en) | 2013-02-13 |
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| CN201220302086XU Expired - Fee Related CN202735073U (en) | 2012-06-26 | 2012-06-26 | Safety valve thermal-state test device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102721539A (en) * | 2012-06-26 | 2012-10-10 | 深圳市特种设备安全检验研究院 | Safety valve thermal-state test device |
| CN103645047A (en) * | 2013-12-27 | 2014-03-19 | 哈尔滨锅炉厂有限责任公司 | Performance testing system for ultra-large displacement safety valve |
| CN103808503A (en) * | 2014-02-24 | 2014-05-21 | 华东理工大学 | Test device and test method for testing delivery capacity of steam security valve |
-
2012
- 2012-06-26 CN CN201220302086XU patent/CN202735073U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102721539A (en) * | 2012-06-26 | 2012-10-10 | 深圳市特种设备安全检验研究院 | Safety valve thermal-state test device |
| CN102721539B (en) * | 2012-06-26 | 2016-07-06 | 深圳市特种设备安全检验研究院 | Safety valve thermal-state test device |
| CN103645047A (en) * | 2013-12-27 | 2014-03-19 | 哈尔滨锅炉厂有限责任公司 | Performance testing system for ultra-large displacement safety valve |
| CN103808503A (en) * | 2014-02-24 | 2014-05-21 | 华东理工大学 | Test device and test method for testing delivery capacity of steam security valve |
| CN103808503B (en) * | 2014-02-24 | 2016-08-24 | 华东理工大学 | The experimental rig of a kind of test vapor Methods of Safety Valve Discharge Capacity and test method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130213 Termination date: 20150626 |
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| EXPY | Termination of patent right or utility model |