CN110160926A - A kind of test method of the porosity equivalent aera of confined space - Google Patents
A kind of test method of the porosity equivalent aera of confined space Download PDFInfo
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- CN110160926A CN110160926A CN201910237582.8A CN201910237582A CN110160926A CN 110160926 A CN110160926 A CN 110160926A CN 201910237582 A CN201910237582 A CN 201910237582A CN 110160926 A CN110160926 A CN 110160926A
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- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
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Abstract
This application discloses a kind of test methods of the porosity equivalent aera of confined space, it is that different pressure difference environments are arranged in the tested confined space by Fan Equipment, and the air mass flow that the Fan Equipment generates when each pressure difference is tested respectively, the air mass flow that the Fan Equipment generates when each pressure difference obtained using test, conversion obtains air mass flow when pressure difference is predetermined low pressure value, according to the pressure difference be predetermined low pressure value when air mass flow, in first passing through the porosity equivalent aera table corresponding with air mass flow that the test of standard confined space obtains in advance, inquiry obtains porosity equivalent aera corresponding to the numerical value of air mass flow when the corresponding pressure difference is predetermined low pressure value, the porosity equivalent aera that inquiry is obtained is as the porosity equivalent aera of the tested confined space.By the test method, the problem of traditional test methods are spent human and material resources not only can solve, at the same time it can also the inaccurate problem of the data that avoid routine test from obtaining.
Description
Technical field
This application involves the testing fields of Air-cleaning technique, and in particular to a kind of porosity equivalent aera of confined space
Test method.
Background technique
In sulfur Gas Fields production zone, natural gas extraction region, device in Gas production zone and some chemical plant attachmentes, have
The hidden danger of great gas leakage accidents or fire incident occurs, in order to maximum in production development safety accident
The safety for protecting the public of the area peripheral edge needs that particularly serious work safety accident occurs (especially in the region
Toxic gas Release and dispersion) after, the prevention policies of a variety of strategies such as taking evacuation, take refuge combine.
Currently, the personnel protection (civil defence engineering) when war is primarily directed to for the research taken refuge on the spot both at home and abroad,
It is less for the Protective Research of taking refuge of toxic gas leakage caused by work safety accident.Environmental factor permeates house gas
It influences, some researchs only has been carried out to ideal model both at home and abroad at present；For house airtight performance and detection technique, only building
It possesses some special knowledge in warming and civil air defense constructions and installations, it is less with evaluation studies for the effect detection of taking refuge of toxic gas leakage.
Therefore, in order to avoid and reduce the accident to leak the poison gas caused by work safety accident in caused by public hurt
Die, for how to assess sanctuary take refuge performance and how effectively using sanctuary the problems such as, urgent need is established
Practicable theoretical data model and evaluation and test technical method.
Air-cleaning technique refers in the unit time that the volume that air exchanges inside and outside house accounts for the ratio of house total volume.
In order to establish the data model and evaluation and test technical method, need to examine the Air-cleaning technique of sanctuary
It surveys, and obtains the Air-cleaning technique of the sanctuary to provide data base to establish the data model and evaluation and test technical method
Plinth.Currently, a kind of method mainly used to the detection of the Air-cleaning technique of sanctuary is pressure test method.
The pressure test method is to carry out the airtight of calculated room by comparing the air pressure inside and outside tested room (cavity)
Property, when test, manually room is inflated or is evacuated, cause air pressure difference inside and outside the room, generates air flowing,
Flow is obtained using flow measurement, to calculate the air capacity for the outside that room is flowed out by hole of different sizes.
But pressure test method can only be for the sanctuary and the external world there are being detected when pressure difference, and for normal pressure
When, i.e., when pressure difference or smaller existing pressure difference is not present in the described sanctuary and outside air, how to use pressure test method to institute
The Air-cleaning technique for stating sanctuary is detected, and there is no preferable solution at present.
If the sanctuary can be accurately obtained and the gross area of the extraneous hole for carrying out air exchange is kept away with described
Ratio (the referred to as porosity equivalent aera A in the application of the gross area of difficult institutet, At=confined space hole the gross area/closed
The space gross area), by the porosity equivalent aera of the sanctuary combine other convenient for measurement environmental condition (such as temperature,
The meteorological conditions such as wind speed), it can substantially calculate the Air-cleaning technique of the sanctuary.
But since the hole in building and the external world can not naked eyes directly observation or in irregular shape, possible work in reality
Porosity equivalent aera for the house of sanctuary accurately can not be tested directly, even if putting into the number that a large amount of manpower and material resources are tested
According to may also accuracy it is inadequate, can not be applied to sanctuary's theoretical model foundation in.
It, can be straight using search gas damped method for only one room of simple building structure such as single building etc.
It connects and obtains its Air-cleaning technique, but for complex building, there is multiple rooms in a building, building configuration is complicated more
Sample causes search gas to be difficult to be uniformly mixed, if test result is applied to sanctuary, is very easy to cause to take refuge at it
The life of people incurs loss.
Summary of the invention
The application provides a kind of test method of the porosity equivalent aera of confined space, of the existing technology to solve
Cannot it is convenient, it is accurate test confined space porosity equivalent aera the problem of.
The application provides a kind of test method of the porosity equivalent aera of confined space, comprising:
When different pressure difference environments being set for the tested confined space by Fan Equipment, and testing each pressure difference respectively
The air mass flow that the Fan Equipment generates；
The air mass flow that the Fan Equipment generates when each pressure difference obtained using test, it is predetermined that conversion, which obtains pressure difference,
Air mass flow when low voltage value；
According to the pressure difference be predetermined low pressure value when air mass flow, first passing through in advance standard confined space test obtain
In porosity equivalent aera table corresponding with air mass flow, inquiry obtains air mass flow when the corresponding pressure difference is predetermined low pressure value
Numerical value corresponding to porosity equivalent aera；
The porosity equivalent aera that inquiry is obtained is as the porosity equivalent aera of the tested confined space.
It is optionally, described that different pressure difference environments are arranged for the tested confined space by Fan Equipment, comprising:
Air is aspirated or injects, to the tested confined space by Fan Equipment by adjusting Fan Equipment production
Raw air mass flow causes the air pressure difference inside and outside the confined space.
Optionally, the different pressure difference environment is within the scope of 25Pa-50Pa.
It is optionally, described to test the air mass flow that the Fan Equipment generates when each pressure difference respectively, comprising:
Test the air mass flow that the Fan Equipment generates when each pressure difference respectively using flowmeter.
Optionally, the air mass flow that the Fan Equipment generates when each pressure difference obtained using test, conversion obtain
Obtain air mass flow when pressure difference is predetermined low pressure value, comprising:
The air mass flow that the Fan Equipment generates when each pressure difference obtained using test, drafting differential pressure-air mass flow
Curve；
Air mass flow when pressure difference is predetermined low pressure value is obtained by the pressure difference-airflow rate curve conversion.
Optionally, the air obtained by the pressure difference-airflow rate curve conversion when pressure difference is predetermined low pressure value
Flow, comprising:
By being analyzed using pressure air discharge relation models fitting to the data in the pressure difference-airflow rate curve,
Obtain air mass flow when pressure difference is predetermined low pressure value.
Optionally, the predetermined low pressure value is 4Pa.
Optionally, the pre- porosity equivalent aera for first passing through the test acquisition of standard confined space is corresponding with air mass flow
Table, comprising:
Different size of throttle orifice is set for the standard confined space, obtains the mark of different size porosity equivalent aera
Quasi- confined space；
Different pressure difference rings are arranged to the standard confined space of different size porosity equivalent aera respectively by Fan Equipment
Border, and the air mass flow that the Fan Equipment generates when each pressure difference is tested respectively；
The air mass flow that the Fan Equipment generates when each pressure difference obtained using test, conversion obtains different big respectively
Air mass flow of the standard confined space of aperture porosity equivalent aera when pressure difference is predetermined low pressure value；
Pass through the numerical value of the porosity equivalent aera of the standard confined space of different size porosity equivalent aera, Yi Jiyu
It is corresponding conversion obtain pressure difference be predetermined low pressure value when air mass flow numerical value, obtain the standard confined space
Porosity equivalent aera table corresponding with air mass flow.
Optionally, the discharge coefficient of the throttle orifice is 1.
Compared with prior art, the test method of the porosity equivalent aera of confined space provided by the present application, comprising: logical
The blower is set when crossing Fan Equipment and different pressure difference environments are arranged for the tested confined space, and testing each pressure difference respectively
The standby air mass flow generated；The air mass flow that the Fan Equipment generates when each pressure difference obtained using test, conversion obtain
Air mass flow when pressure difference is predetermined low pressure value；According to the pressure difference be predetermined low pressure value when air mass flow, first passing through in advance
In the porosity equivalent aera table corresponding with air mass flow that the test of standard confined space obtains, inquiry obtains the corresponding pressure difference and is
Porosity equivalent aera corresponding to the numerical value of air mass flow when predetermined low pressure value；The porosity equivalent that inquiry is obtained
Porosity equivalent aera of the area as the tested confined space.The porosity equivalent face of confined space provided by the present application
Long-pending test method, not only can solve the problem of traditional test methods are spent human and material resources, at the same time it can also avoid conventional survey
Try the inaccurate problem of obtained data.Can Air-cleaning technique that is convenient, being accurately obtained the tested confined space,
And then for for the confined space theorize data model and evaluate and test technical method data basis is provided.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The some embodiments recorded in application can also be obtained according to these attached drawings other for those of ordinary skill in the art
Attached drawing.
Fig. 1 is the process of the test method of the porosity equivalent aera for the confined space that the first embodiment of the application provides
Figure；
Fig. 2 is the interior or exterior space distribution signal for the common tested confined space that the first embodiment of the application provides
Figure；
It in pressure differential range is in 25Pa-50Pa that Fig. 3, which is the tested confined space that provides of the first embodiment of the application,
Pressure difference-air mass flow schematic diagram；
It in porosity equivalent aera is 1.0cm that Fig. 4, which is the standard confined space that provides of the first embodiment of the application,2/m2
When, it is pressure difference-air mass flow schematic diagram in 10Pa-50Pa in pressure differential range.
Specific embodiment
Many details are explained in the following description in order to fully understand the application.But the application can be with
Much it is different from other way described herein to implement, those skilled in the art can be without prejudice to the application intension the case where
Under do similar popularization, therefore the application is not limited by the specific embodiments disclosed below.
The application provides a kind of test method of the porosity equivalent aera of confined space, and the following are specific embodiments:
As shown in Figure 1, it is the test side of the porosity equivalent aera for the confined space that the application first embodiment provides
The flow chart of method embodiment, described method includes following steps:
Step S101 is that different pressure difference environments are arranged in the tested confined space, and test respectively by Fan Equipment
The air mass flow that the Fan Equipment generates when each pressure difference.
The tested confined space refer to be possibly used for as sanctuary can confined space, and this can confined air
Between carried out according to the general tight requirements for refuge chamber it is conventional closed；Although tested confined space has carried out close
Close, still there is gap with extraneous, there are gas exchanges, i.e., described tested confined space it is so-called it is " closed " be opposite
, that is, it takes and closes window and the conventional closed measure such as close the door, rather than it is absolute closed with the external world；Take the closed measure of above-mentioned routine
Sanctuary afterwards is the object of this method measurement porosity equivalent aera.
It whether there is directly according to the tested confined space and (be mainly herein with the building structure of extraneous exchanging gas
Refer to door and window etc.) it distinguishes, tested confined space can be divided into: the tested confined space in inside, the tested confined space in outside.
As shown in Fig. 2, it is the interior or exterior space distribution schematic diagram of common tested confined space provided in this embodiment,
Wherein, internal tested confined space refers to that the tested confined space is not directly used in the external world and exchanges
Building structure, generally refer to the separate space positioned at building interior, the separate space can directly carry out with the external world empty
The building structure that gas exchanges with the extraneous air exchange that carries out is realized indirectly and the external world by the exterior space in space where it
Air exchange.Under normal circumstances, the airtightness of such confined space is relatively preferable, inner space as shown in Figure 2, as
Typical internal tested confined space.Wherein, external tested confined space, refers to the tested confined space and the external world
In the presence of the building structure for being directly used in exchange, air friendship can directly be carried out with extraneous by generally referring to the tested confined space
It changes.Under normal circumstances, the airtightness of such confined space is relatively slightly worse, exterior space as shown in Figure 2, as typical external
Tested confined space.
In the present embodiment, unless otherwise specified, the general tested confined space is primarily referred to as shown in Figure 2
Exterior space, certainly, the test method of the porosity equivalent aera of the tested confined space in inside and external tested confined air
Between method and step and details it is almost the same, confined space is mainly illustrated with the tested confined space in outside in the present embodiment
Porosity equivalent aera test method.
Air-cleaning technique refers in the unit time that the volume that air exchanges inside and outside house accounts for the ratio of house total volume.
Air mass flow refers in the unit time that air flows out the air quality of inflow inwardly outwardly or outside out of house
It is converted into and the volume under house peacetime state air pressure (i.e. normal pressure).Air mass flow described in the present embodiment is usually survey with pressure
Examination, so volume is needed to convert under normal pressure (i.e. normal pressure).
In daily, pressure test method is mainly used to the detection of the Air-cleaning technique of tested confined space, pressure is surveyed
The pressure air discharge relation model used in examination method test process are as follows: Q=Cpn；
Wherein:
Q refers to air mass flow, unit m3/s；
C refers to discharge coefficient, is obtained according to the data fitting measured, unit m3/(s·Pan)；
P refers to inside and outside differential pressure, unit Pa；
N, finger pressure index obtain, dimensionless according to the data fitting measured.
By above-mentioned relation model it can be seen that, in p=0, Q 0, and such case does not obviously meet even in everyday situations.For
Convenient, accurate test obtains the Air-cleaning technique that confined space is tested under normal pressure, and the present embodiment is using in advance testing
To the porosity equivalent aera of tested confined space, the porosity for reusing the tested confined space that test obtains is worked as
Measure the porosity equivalent aera for the confined space that the numerical value of area is obtained in multiple code test and the relation table of Air-cleaning technique
Middle lookup obtains the Air-cleaning technique of the tested confined space.
In order to test to obtain the porosity equivalent aera of the tested confined space, current embodiment require that being set by blower
It is standby that for the tested confined space, different pressure difference environments are set, and test what Fan Equipment when each pressure difference generated respectively
Air mass flow.It is described that different pressure difference environments are arranged for the tested confined space by Fan Equipment, it is taken in the present embodiment
Using Fan Equipment air is aspirated or injected so that the method for different pressure difference environments is arranged to the tested confined space.
It wherein, is that different pressure difference environments are arranged in the tested confined space by Fan Equipment, comprising: set by blower
It is standby that air is aspirated or injected to the tested confined space, cause the air pressure difference inside and outside the confined space.At this
First it is about to the pressure boost of the tested confined space in embodiment, in particular to using Fan Equipment to certain numerical value,
Then pressure drop needed for making the tested confined space and extraneous pressure difference reach test is testing the corresponding wind
The tested confined space is depressurized after the air mass flow that machine equipment generates, then gradually, and each pressure is tested respectively
The air mass flow that the Fan Equipment generates when poor.
Safety, accuracy and cost problem are comprehensively considered, by the pressure difference ring of tested confined space in the present embodiment
Border is arranged within the scope of 25Pa-50Pa, i.e., the tested confined space is pressurized to inside and outside differential pressure using Fan Equipment first
In 50Pa range, after being tested, then the pressure difference of the tested confined space is gradually reduced, until pressure difference environment to 25Pa
Range.Certainly, be specifically pressurized or the mode of decompression be not limited to the present embodiment the mode, meanwhile, with environment variation or
The progress of person's science and technology, the range of pressure difference environment can also be arranged it is more broader, to improve numerical value that final test obtains
Precision repeats no more herein.
Tested confined space Fan Equipment generation in each pressure difference in order to obtain in the present embodiment
Air mass flow mainly tests the air mass flow that the Fan Equipment generates when each pressure difference using flowmeter respectively.
Step S102, the air mass flow generated using Fan Equipment described when testing each pressure difference obtained, conversion are obtained
Air mass flow when pressure difference is predetermined low pressure value.
After above-mentioned steps S101, tested confined space Fan Equipment in each pressure difference is obtained and has generated
Air mass flow, in the present embodiment, the number of air mass flow of the tested confined space in atmospheric pressure environment in order to obtain
Value, using the numerical value for generating air mass flow according to the Fan Equipment obtained above, it is predetermined low pressure value that conversion, which obtains pressure difference,
When air mass flow.
The air mass flow that the Fan Equipment generates when each pressure difference obtained using test, conversion obtain pressure difference and are
Air mass flow when predetermined low pressure value, comprising: the air stream that the Fan Equipment generates when each pressure difference obtained using test
Amount, drafting differential pressure-airflow rate curve；When by the conversion of the pressure difference-airflow rate curve, to obtain pressure difference be predetermined low pressure value
Air mass flow.As shown in figure 3, it is in pressure differential range for tested confined space as shown in Figure 2 provided in this embodiment
Pressure difference-airflow rate curve of the numeric renderings for the corresponding air mass flow that test obtains in 25Pa-50Pa.
Wherein, the air stream obtained by the pressure difference-airflow rate curve conversion when pressure difference is predetermined low pressure value
Amount, comprising: by being analyzed using pressure air discharge relation models fitting to the data in the pressure difference-airflow rate curve,
Obtain air mass flow when pressure difference is predetermined low pressure value.Sky of the tested confined space in predetermined low pressure value in order to obtain
Throughput, the present embodiment are analyzed in pressure difference-airflow rate curve as shown in Figure 3 using pressure air discharge relation models fitting
Data, obtain pressure difference be predetermined low pressure value when the tested confined space air mass flow.
In nature, when pressure is 0, the practical pressure repeatedly still having in tested confined space back and forth
Power causes air pressure to exchange, therefore, in daily nature be tested in the case of described normal pressure confined space be still have it is certain
Pressure drop, generally in the range of 3Pa-5Pa.In the present embodiment, the predetermined low pressure value is 4Pa.
In the present embodiment, pressure difference-air as shown in Figure 3 is analyzed by using pressure air discharge relation models fitting
Data in flow curve show that air mass flow of the tested confined space in 4Pa is 325m3/h。
Air mass flow when step S103 according to the pressure difference is predetermined low pressure value, is first passing through standard confined space in advance
It tests in the porosity equivalent aera table corresponding with air mass flow obtained, when the corresponding pressure difference of inquiry acquisition is predetermined low pressure value
Air mass flow numerical value corresponding to porosity equivalent aera.
After above-mentioned steps S102, the air mass flow that the Fan Equipment generates when by testing each pressure difference obtained,
Conversion obtains air mass flow of the tested confined space when pressure difference is predetermined low pressure value.In order to be pre- according to the pressure difference
Air mass flow when determining low voltage value obtains the porosity equivalent aera of the tested confined space, in the present embodiment according to
Pressure difference be predetermined low pressure value when air mass flow, first pass through in advance standard confined space test obtain porosity equivalent aera with
Air mass flow corresponds in table, and inquiry obtains hole corresponding to the numerical value of air mass flow when the corresponding pressure difference is predetermined low pressure value
Porosity equivalent aera.
Wherein, the pre- porosity equivalent aera for first passing through the test acquisition of standard confined space is corresponding with air mass flow
Table, comprising: different size of throttle orifice is set for the standard confined space, obtains the mark of different size porosity equivalent aera
Quasi- confined space；Different pressure differences are arranged to the standard confined space of different size porosity equivalent aera respectively by Fan Equipment
Environment, and the air mass flow that the Fan Equipment generates when each pressure difference is tested respectively；When each pressure difference obtained using test
The air mass flow that the Fan Equipment generates, the standard confined space that conversion obtains different size porosity equivalent aera respectively exist
Air mass flow when pressure difference is predetermined low pressure value；Pass through the porosity of the standard confined space of different size porosity equivalent aera
The numerical value of air mass flow when the pressure difference that the numerical value of equivalent aera and corresponding conversion obtain is predetermined low pressure value,
Obtain the porosity equivalent aera table corresponding with air mass flow of the standard confined space.
The standard confined space refers to the standard confined space being arranged in code test environment, under ideal conditions, institute
The standard confined space of stating can be understood as completely cutting off completely with extraneous, and therefore, porosity equivalent aera is substantially equal to 0；
The throttle orifice refers on the wall in code test environment between the standard confined space and the external world, if
The area set is standard value or the adjustable hole of area, and the discharge coefficient of the throttle orifice is 1, and discharge coefficient is with reference to above-mentioned
Pressure air discharge relation model formation.
In the present embodiment, the standard confined space be provided with it is different size of can open or closed throttle orifice,
Or the throttle orifice that can be precisely adjusted provided with area, so that it may closed in conjunction with the standard by adjusting throttle hole area
The characteristic parameters such as the volume in space itself obtain the confined space with accurate porosity equivalent aera.
It is described that for the standard confined space, different size of throttle orifice is set, obtain different size porosity equivalent aera
Standard confined space, that is, refer to the throttle orifice for disposing different area respectively on the confined space, or by that will be adjusted
Throttle orifice be set as different areas, obtain the standard confined space with Different porosities equivalent aera value.
Wherein, described that different pressure difference environments are arranged for the standard confined space by Fan Equipment, and test is each respectively
The air mass flow that the Fan Equipment generates when a pressure difference.Because the standard confined space be in code test environment, can
To reduce by related setting or avoid the influence of the other factors such as wind speed, temperature, so in code test environment, to described
The pressure difference environment of standard confined space can be set within the scope of 10Pa-50Pa.Other steps and details are in above-mentioned steps
It has been had a detailed description in S101, details are not described herein again, specifically may refer to details described in above-mentioned steps S101.
In addition, the air mass flow that the Fan Equipment generates when each pressure difference obtained using test, analysis conversion
Obtain air mass flow of the standard confined space of different size porosity equivalent aera when pressure difference is predetermined low pressure value.Specific side
Method has had a detailed description in above-mentioned steps S102, and details are not described herein again, specifically may refer to be retouched in above-mentioned steps S102
The details stated.
In addition, the air mass flow that the Fan Equipment generates when each pressure difference obtained using test, is converted respectively
Obtain air mass flow of the standard confined space of different size porosity equivalent aera when pressure difference is predetermined low pressure value；By not
Numerical value and corresponding conversion with the porosity equivalent aera of the standard confined space of size porosity equivalent aera
The numerical value of air mass flow when the pressure difference of acquisition is predetermined low pressure value, obtains the porosity equivalent aera of the standard confined space
Table corresponding with air mass flow.Specific method with had a detailed description in above-mentioned steps S102, details are not described herein again, specifically may be used
Referring to details described in above-mentioned steps S102.
As shown in figure 4, it is 1.0cm in porosity equivalent aera for the standard confined space provided in this embodiment2/
m2When, it is pressure difference-air mass flow schematic diagram in 10Pa-50Pa in pressure differential range.By to pressure difference-air as shown in Figure 4
Data in flow are analyzed using pressure air discharge relation models fitting, obtain the standard confined space in corresponding section
The area of discharge orifice is 1.0cm2/m2, while pressure difference be predetermined low pressure value (it is corresponding with above-mentioned steps S102 in the present embodiment,
The predetermined low pressure value is 4Pa) when air mass flow be 325m3/h.According to the numerical value of above-mentioned acquisition, different aperture can be obtained
It spends under equivalent aera, corresponding air flow value, these corresponding relationships can pass through curve under the conditions of the predetermined low pressure value
Or charting；The curve or table reflect under Different porosities equivalent aera under the conditions of predetermined low pressure value
Air flow value, also reflect the corresponding porosity equivalent aera of different air flow values under the conditions of predetermined low pressure value,
By the corresponding relationship, this house characteristics of the porosity equivalent aera in house can be determined by measuring air flow value,
Its air mass flow under the conditions of predetermined low pressure value can be determined to the house of porosity equivalent aera has been determined.
Such as by above-mentioned S102 step, conversion obtains air stream of the tested confined space when pressure difference is 4Pa
Amount is 325m3/h.Further according to the numerical value of the air mass flow, work as first passing through the porosity that the test of standard confined space obtains in advance
It is inquired in amount area table corresponding with air mass flow, show that the porosity equivalent aera for being tested confined space in the present embodiment is
1.0cm2/m2。
Step S104, the porosity equivalent aera that inquiry is obtained is as the porosity of the tested confined space
Equivalent aera.
By above-mentioned steps S103, according to air stream of the tested confined space when pressure difference is predetermined low pressure value
Amount, and, the porosity equivalent aera table corresponding with air mass flow that the test of standard confined space obtains is first passed through in advance, and inquiry obtains
Corresponding porosity equivalent aera, the porosity equivalent aera that the inquiry obtains can be shown as the tested confined space
Porosity equivalent aera in predetermined low pressure value.In the present embodiment, through the above steps S103 it is found that in the present embodiment
The porosity equivalent aera of tested confined space is 1.0cm2/m2。
So far, test has obtained porosity equivalent aera corresponding to the tested confined space, passes through the hole
Equivalent aera is spent, by carrying out the porosity as shown in Table 1 that multiple code test obtains to type house as shown in Figure 2
Inquired in the relation table of equivalent aera and Air-cleaning technique, can be obtained the tested confined space predetermined low pressure value (i.e.
Normal pressure) when corresponding Air-cleaning technique.Wherein, the relationship of porosity equivalent aera as shown in Table 1 and Air-cleaning technique
Table is to be obtained in the standard confined space described in the present embodiment step S103 by other test methods, method and step
Suddenly it repeats no more in the present embodiment.
In the present embodiment, by being inquired in table 1 it is found that the air of the tested confined space in the present embodiment is handed over
Changing rate is 0.100098.
Table 1
In conclusion the test method of the porosity equivalent aera by confined space provided by the present application, can solve
Because pressure test method can not be applied to the drawbacks of being tested the test of the Air-cleaning technique of confined space in atmospheric pressure environment,
At the same time it can also avoid in practical confined space because building visually can not be observed directly with extraneous hole or shape is not advised
Then, the porosity equivalent aera of the practical confined space in turn resulted in accurately can not be tested directly, and even if time-consuming and laborious survey
Obtained data also inaccurate problem is tried, the test method of the porosity equivalent aera of confined space provided by the present application can
With it is convenient, be accurately obtained Air-cleaning technique of the tested confined space in atmospheric pressure environment, and then for for described close
Close space theorize data model and evaluation and test technical method provide data basis.
Above to a kind of embodiment progress of the test method of the porosity equivalent aera of confined space provided by the present application
It is discussed in detail, specific examples are used herein to illustrate the principle and implementation manner of the present application, above embodiments
Explanation be merely used to help understand the present processes and its core concept；At the same time, for those skilled in the art,
According to the thought of the application, there will be changes in the specific implementation manner and application range.In conclusion in this specification
Hold the limitation that should not be construed as to the application.The range that the protection scope of the application should be defined with the claim of this application is
It is quasi-.
Claims (9)
1. a kind of test method of the porosity equivalent aera of confined space characterized by comprising
Described in when by Fan Equipment being that different pressure difference environments are arranged in the tested confined space, and testing each pressure difference respectively
The air mass flow that Fan Equipment generates；
The air mass flow that the Fan Equipment generates when each pressure difference obtained using test, it is predetermined low pressure that conversion, which obtains pressure difference,
Air mass flow when value；
According to the pressure difference be predetermined low pressure value when air mass flow, first pass through in advance standard confined space test obtain hole
It spends in equivalent aera table corresponding with air mass flow, inquiry obtains the number of air mass flow when the corresponding pressure difference is predetermined low pressure value
The corresponding porosity equivalent aera of value；
The porosity equivalent aera that inquiry is obtained is as the porosity equivalent aera of the tested confined space.
2. the test method of the porosity equivalent aera of confined space according to claim 1, which is characterized in that described logical
Crossing Fan Equipment is that different pressure difference environments are arranged in the tested confined space, comprising:
Air is aspirated or injected to the tested confined space by Fan Equipment, is generated by adjusting the Fan Equipment
Air mass flow causes the air pressure difference inside and outside the confined space.
3. the test method of the porosity equivalent aera of confined space according to claim 2, which is characterized in that it is described not
Same pressure difference environment is within the scope of 25Pa-50Pa.
4. the test method of the porosity equivalent aera of confined space according to claim 1, which is characterized in that described point
The air mass flow that the Fan Equipment generates when each pressure difference is not tested, comprising:
Test the air mass flow that the Fan Equipment generates when each pressure difference respectively using flowmeter.
5. the test method of the porosity equivalent aera of confined space according to claim 1, which is characterized in that described to make
The air mass flow that the Fan Equipment generates when each pressure difference obtained with test, conversion obtain when pressure difference is predetermined low pressure value
Air mass flow, comprising:
The air mass flow that the Fan Equipment generates when each pressure difference obtained using test, drafting differential pressure-airflow rate curve；
Air mass flow when pressure difference is predetermined low pressure value is obtained by the pressure difference-airflow rate curve conversion.
6. the test method of the porosity equivalent aera of confined space according to claim 5, which is characterized in that described logical
Cross the air mass flow when pressure difference-airflow rate curve conversion acquisition pressure difference is predetermined low pressure value, comprising:
By being analyzed using pressure air discharge relation models fitting to the data in the pressure difference-airflow rate curve, obtain
Air mass flow when pressure difference is predetermined low pressure value.
7. the test method of the porosity equivalent aera of confined space according to claim 5, which is characterized in that described pre-
Determining low voltage value is 4Pa.
8. the test method of the porosity equivalent aera of confined space according to claim 1, which is characterized in that described pre-
First pass through the porosity equivalent aera table corresponding with air mass flow that the test of standard confined space obtains, comprising:
Different size of throttle orifice is set for the standard confined space, the standard for obtaining different size porosity equivalent aera is close
Close space；
Different pressure difference environments are arranged to the standard confined space of different size porosity equivalent aera respectively by Fan Equipment, and
The air mass flow that the Fan Equipment generates when each pressure difference is tested respectively；
The air mass flow that the Fan Equipment generates when each pressure difference obtained using test, conversion obtains different size hole respectively
Air mass flow of the standard confined space of porosity equivalent aera when pressure difference is predetermined low pressure value；
Pass through the numerical value of the porosity equivalent aera of the standard confined space of different size porosity equivalent aera, and phase therewith
The numerical value of air mass flow when the pressure difference that corresponding conversion obtains is predetermined low pressure value, obtains the hole of the standard confined space
Spend equivalent aera table corresponding with air mass flow.
9. the test method of the porosity equivalent aera of confined space according to claim 8, which is characterized in that the section
The discharge coefficient of discharge orifice is 1.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110145157A (en) * | 2019-04-08 | 2019-08-20 | 中国安全生产科学研究院 | A kind of refuge chamber setting method and its refuge chamber |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110145157A (en) * | 2019-04-08 | 2019-08-20 | 中国安全生产科学研究院 | A kind of refuge chamber setting method and its refuge chamber |
| CN110145157B (en) * | 2019-04-08 | 2024-07-23 | 中国安全生产科学研究院 | Refuge chamber setting method and refuge chamber |
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Application publication date: 20190823 |