CN102798565B - Gas distribution device utilizing saturated steam method to simulate exhalation gas alcohol content and concentration algorithm thereof - Google Patents

Gas distribution device utilizing saturated steam method to simulate exhalation gas alcohol content and concentration algorithm thereof Download PDF

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CN102798565B
CN102798565B CN201210272178.2A CN201210272178A CN102798565B CN 102798565 B CN102798565 B CN 102798565B CN 201210272178 A CN201210272178 A CN 201210272178A CN 102798565 B CN102798565 B CN 102798565B
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CN102798565A (en
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张守明
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Anhui Province Metering Scientific Research Institute
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Abstract

The invention discloses a gas distribution device utilizing a saturated steam method to simulate exhalation gas alcohol content and a concentration algorithm thereof. The device comprises an air source, a mass flow controller, a steam generation fluid container, an air valve, a rotameter and a spiral elbow, wherein gas output by the air source is divided into three ways which are respectively used as diluent gas and carrier band gas, and saturated steam is subjected to secondary dilution. The gas distribution device utilizing the saturated steam method to simulate the exhalation gas alcohol content and the concentration algorithm thereof provided by the invention have the advantages that the standard gases with different concentrations are very conveniently obtained, dry gas and wet gas can be selected at will, the temperature is set, and the output flow is adjustable and the like.

Description

Saturated vapor method simulation alcoholicity of exhaled gas air distributing device and Concentration Algorithm thereof
Technical field
The present invention relates to a kind of saturated vapor method simulation alcoholicity of exhaled gas air distributing device and Concentration Algorithm thereof.
Background technology
Exhalation alcohol-detection instrument is widely used in the daily law enforcement of traffic police and safety in production, is the measurement instrument that is put into strong inspection catalogue.Constantly perfect along with China's legal construction, the legal calibrating demand of exhalation alcohol content detector is just enhanced, and therefore, it is extremely important that reliable and practical calibrating installation just seems.
In addition, domestic corporation or manufacturing enterprise are when research and production exhalation alcohol-detection instrument or its sensor, can only use function singleness or depart from the calibrating gas device of expiration feature, bring very large difficulty therefore to the research and production of exhalation alcohol-detection instrument, owing to being difficult to use the device of flexibility and reliability, to such an extent as to be difficult to the reason of understanding fully that development process has problems.
China and even developed country, there is no " simulation alcoholicity of exhaled gas air distributing device " flexibly and fast at present.The working method of domestic and international existing air distributing device mainly contains four kinds:
1), static capacity method: extract the ethanol liquid of certain capacity with microsyringe, inject gasification indoor, under given flow, regularly gasification ethanol is brought in the gas collection bag of anti-absorption standby; The gas that the method obtains is used inconvenience, and efficiency is extremely low, completes once for several times complicated distribution of specific need of work, and dry gas can only be provided;
2), the canned gas of steel cylinder (gravimetric method): the method also belongs to dry gas method, and has absorption and even release And Spread of Solute under different pressures;
3), dynamic capacity method: under given flow, carrier gas is by the air chamber of steady temperature, and the alcohol gas that will quantitatively be discharged by standard pipe in air chamber be brought in gas collection bag uniformly and stably, and after reaching certain amount, unnecessary gas discharges automatically; The method also belongs to dry gas method;
4), ethanol water vapor method analogue means, the simulation gas of belong to breathing out, belongs to equipment produced in USA, during preparation variable concentrations or use a plurality of devices, or alternately prepares; After using certain number of times, ethanol content is on the low side gradually, also because of magnitude tracing problem, by domestic expert, is not approved at present, is difficult to use as standard set-up.
Summary of the invention
The present invention is the weak point existing in above-mentioned prior art for avoiding, a kind of saturated vapor method simulation alcoholicity of exhaled gas air distributing device and Concentration Algorithm thereof are provided, to obtain easily the calibrating gas of variable concentrations and dry gas, moisture, can set arbitrarily, delivery rate is adjustable.
The invention provides a kind of saturated vapor method simulation alcoholicity of exhaled gas air distributing device.
Saturated vapor method simulation alcoholicity of exhaled gas air distributing device, its design feature is to comprise source of the gas, mass flow controller, steam generation flow container, air valve, spinner-type flowmeter and spiral bending tube; Mass flow controller comprises the first mass flow controller, the second mass flow controller, the 3rd mass flow controller and the 4th mass flow controller; Steam generation flow container comprises water vapor generation flow container and ethanol saturated vapor generation flow container; Spiral bending tube comprises the first spiral bending tube and the second spiral bending tube;
The gas of described source of the gas output is divided into three tunnel outputs: first via gas is exported by the 4th mass flow controller, water vapor generation flow container and the second spiral bending tube successively, the second road gas is exported by the 3rd mass flow controller, the first spiral bending tube, the second mass flow controller and the second spiral bending tube successively, and Third Road gas is exported by the first mass flow controller, ethanol saturated vapor generation flow container, the first spiral bending tube, the second mass flow controller and the second spiral bending tube successively; On the pipeline between described the first spiral bending tube and the second mass flow controller, be provided with described spinner-type flowmeter; Between the gas inlet tube of described water vapor generation flow container and gas outlet tube, be provided with described air valve.
The feature of saturated vapor method simulation alcoholicity of exhaled gas air distributing device of the present invention is also:
In described steam generation flow container, be provided with for measure the liquid in described steam generation flow container temperature temperature sensor and for measuring the absolute pressure pressure transducer of the pressure of the steam in described steam generation flow container; Within the lower end of the gas inlet tube in described steam generation flow container is immersed in liquid, and be provided with gondola water faucet in the bottom of gas inlet tube.
The present invention also provides a kind of Concentration Algorithm of above-mentioned saturated vapor method simulation alcoholicity of exhaled gas air distributing device.
A Concentration Algorithm for saturated vapor method simulation alcoholicity of exhaled gas air distributing device described in basis, comprises the following steps,
The first step: the concentration C 0 of determining saturated vapour pressure according to the law of partial pressure;
Wherein, C 0 = P ( t ) P 0 × 10 6 - - - ( 1 ) ;
The vapor pressure that in formula (1), P (t) is saturated vapor, P 0for the absolute pressure of ethanol fluid reservoir upper gas, P (t) and P 0unit be kPa, C 0unit be mol/mol;
Second step: carry out first order dilution, obtain the gas concentration C after first order dilution 1, its dilution formula is as follows:
C 1 = Q 1 · P 0 P 0 - P ( t ) Q 1 · P 0 P 0 - P ( t ) + Q 3 · C 0 - - - ( 2 ) ;
In formula (2): Q 1for the flow of first order carrier band gas, Q 3for the flow of first order diluents, at carrier band gas Q 1the lower flow that flows out saturated alcohol gas of effect; Q 1, Q 3with unit be ml/min;
The 3rd step: the Primordial Qi of obtaining second level diluents; By mass flow controller, obtain the Primordial Qi of second level diluents, unnecessary gas is emptying by spinner-type flowmeter; By mass flow controller, to various component gases, must revise, for air, the correction factor of air ethanol mixed gas is this coefficient k and concentration C 1relevant; Therefore, the flow Q of the Primordial Qi of second level diluents 2revise, actual flow is pressed kQ 2calculate;
The 4th step: carry out second level dilution, acquisition work calibrating gas; The diluting gas flow of second level dilution is Q 4, but need carry out humidification as this gas time, its flow should consider to add the amount of water vapor, need be calculated as follows:
Q 4 · P W 0 P W 0 - P w ( t ) - - - ( 3 ) ;
In formula (3): P w0absolute pressure for water fluid reservoir upper gas; P w(t) be water saturation vapor pressure, P w0and P w(t) unit is Pa;
So the gas concentration after secondary dilution is: C 2 = C 1 · k · Q 2 k · Q 2 + Q 4 · P W 0 P W 0 - P w ( t ) ;
The 5th step: the concentration unit to gas converts;
In above step, the unit of each concentration is mol/mol, is scaled corresponding to alcohol concentration C in blood,
C = 1 2.3712 · C 2 - - - ( 4 ) ;
Above process finally can be merged into complete formula:
C = 1 2.3712 · Q 1 · P 0 P 0 - P ( t ) Q 1 · P 0 P 0 - P ( t ) + Q 3 · k · Q 2 k · Q 2 + Q 4 · P W 0 P W 0 - P w ( t ) · P ( t ) P 0 × 10 6 - - - ( 5 ) ;
In formula (1)～formula (5): C is the concentration of output alcohol gas, and wherein the concentration of C has been converted as 100ml ethanol in blood content, and its unit is mg/100ml; Q 1for the flow of first order carrier band gas, its unit is ml/min; Q 2for sample flow after first order dilution, be the former airshed of second level dilution, its unit is ml/min; Q 3for the flow of first order diluents, its unit is ml/min; Q 4for the flow of second level diluents, its unit is ml/min; P 0for the absolute pressure of ethanol fluid reservoir upper gas, its unit is kPa; The saturated vapour pressure that P (t) is ethanol, its unit is kPa; P w0for the absolute pressure of water fluid reservoir upper gas, its unit is Pa; P w(t) be water saturation vapor pressure, its unit is Pa; K is mass flowmeter F 2correction factor to alcohol gas flow.
Compared with the prior art, beneficial effect of the present invention is embodied in:
What saturated vapor method simulation alcoholicity of exhaled gas air distributing device adopted is that saturated vapor is as standard Primordial Qi, through secondary dilution acquisition work gas, in this process, the gas that need obtain one-level dilution is shunted and is sampled, because sampling quality flow controller need could normally be worked under certain air pressure conditions, so adopt spinner-type flowmeter to shunt here, utilize the float of spinner-type flowmeter to produce a minute drift angle, offer mass flow controller.In addition, mass flow controller is not to be stressed and the flow device of temperature impact, therefore can regulate the needle-valve of spinner-type flowmeter, obtains the suitable pressure flow controller of can ensuring the quality of products and normally implements flow regulation and control.In the design of humidification method, the mode of the end carrier gas humidification of why sampling, mainly considers the physical characteristics of ethanol, in this manner, due to the end of mixed process at device, and is under dynamically, can guarantee the stable of ethanol content.Unique gas circuit structure, make air-channel system working stability, according to temperature and pressure parameter, accurately draw the concentration of alcohol gas, because device adopts the continuous air feed of dynamical fashion, and can carry out endways humidification selection and the selection of heating, so the present invention has high dirigibility and high efficiency.
Involved in the present invention is a kind of air distributing device that utilizes saturated vapor method to obtain simulation alcoholicity of exhaled gas, because the carrier gas of the ethanol of flowing through can obtain continuous saturated vapor, this steam is carried out to secondary dilution, via rear class heating and moistening (or the not humidification of not heating), can obtain desirable calibrating gas again.Because the flow of device is adjustable arbitrarily, therefore, can obtain easily the calibrating gas of variable concentrations, and dry gas, moisture can set arbitrarily, variable temperatures, delivery rate is adjustable.Due to this dirigibility, for the development of alcohol content of exhalation gas detector, the research work of related fields has the advantage of quite flexible.
Saturated vapor method of the present invention simulation alcoholicity of exhaled gas air distributing device and Concentration Algorithm thereof, have and can obtain easily calibrating gas and dry gas, moisture (moisture content) setting arbitrarily, the variable temperatures of variable concentrations, the advantage such as delivery rate is adjustable.
Accompanying drawing explanation
Fig. 1 is the structural representation of saturated vapor method simulation alcoholicity of exhaled gas air distributing device of the present invention.
Label in accompanying drawing 1: 1 source of the gas, 2 air valves, 3 spinner-type flowmeters, 4 first mass flow controllers, 5 second mass flow controllers, 6 the 3rd mass flow controllers, 7 the 4th mass flow controllers, 8 water vapor generation flow containers, 9 ethanol saturated vapor generation flow containers, 10 first spiral bending tubes, 11 second spiral bending tubes, 12 gas inlet tubes, 13 gas outlet tubes, 14 temperature sensors, 15 absolute pressure pressure transducers, 16 gondola water faucets.
Below pass through embodiment, and the invention will be further described by reference to the accompanying drawings.
Embodiment
Referring to Fig. 1, saturated vapor method simulation alcoholicity of exhaled gas air distributing device, comprises source of the gas 1, mass flow controller, steam generation flow container, air valve 2, spinner-type flowmeter 3 and spiral bending tube; Mass flow controller comprises the first mass flow controller 4, the second mass flow controller 5, the 3rd mass flow controller 6 and the 4th mass flow controller 7; Steam generation flow container comprises water vapor generation flow container 8 and ethanol saturated vapor generation flow container 9; Spiral bending tube comprises the first spiral bending tube 10 and the second spiral bending tube 11;
The gas of described source of the gas 1 output is divided into three tunnel outputs: first via gas is successively by the 4th mass flow controller 7, water vapor generation flow container 8 and the second spiral bending tube 11 outputs, the second road gas is successively by the 3rd mass flow controller 6, the first spiral bending tube 10, the second mass flow controller 5 and the second spiral bending tube 11 outputs, and Third Road gas is successively by the first mass flow controller 4, ethanol saturated vapor generation flow container 9, the first spiral bending tube 10, the second mass flow controller 5 and the second spiral bending tube 11 outputs; On the pipeline between described the first spiral bending tube 10 and the second mass flow controller 5, be provided with described spinner-type flowmeter 3; Between the gas inlet tube 12 of described water vapor generation flow container 8 and gas outlet tube 13, be provided with described air valve 2.
Described mass flow controller, steam generation flow container, air valve, spinner-type flowmeter and spiral bending tube gas are divided into three tunnel outputs, form two-stage gas dilution air-channel system.In Fig. 1, the identifier of the first mass flow controller 4, the second mass flow controller 5, the 3rd mass flow controller 6 and the 4th mass flow controller 7 is respectively F1, F2, F3 and F4.
The flow control scope of F1, F3 is 0～600ml/min, and F2 flow control scope is 0～1000ml/min, and the flow control scope of F4 is 0～30L/min.
Wherein, first order gas circuit has comprised F1 and F3, and F1 and ethanol saturated vapor generation flow container form carrier band gas circuit, and F3 forms dilution gas circuit.Second level gas circuit has comprised F2 and F4, and F2 is as the sample flow controller of the rear gas of first order gas circuit dilution, and F4 is as the diluent gas flow amount controller of second level dilution gas circuit.
The steady air flow of the F1 of carrier band gas circuit output in described first order gas circuit, is entered the bottom of ethanol saturated vapor generation flow container by the gas inlet tube 12 with gondola water faucet 16.On described gondola water faucet 16, be provided with a plurality of airflow diversions hole.
Described water vapor generation flow container 8 and ethanol saturated vapor generation flow container 9 be the tank body of similar structures, in tank body, be inserted with temperature sensor, on the inside surface of tank body top cover, be provided with absolute pressure pressure transducer, the lower end of gas inlet tube is gondola water faucet, by the gas outlet tube of pegging graft on top cover, steam is exported in next parts.
In described ethanol saturated vapor generation flow container 9, hold a certain amount of ethanolic solution, absolute pressure pressure transducer, saturated vapor gas outlet tube are arranged at its top, and the temperature sensor measuring the temperature of a liquid is separately housed.The gas of the gas outlet tube output of ethanol saturated vapor generation flow container, within inputing to the first spiral bending tube 10 together with gas that the wireway of the output terminal of the F3 of first order dilution gas circuit is exported, through form the Primordial Qi of first order diluents after fully mixing in the first spiral bending tube 10.
The Primordial Qi of described first order diluents is divided into two-way by three-way pipe, wherein a road via after F2 output as the Primordial Qi of second level diluents, input in the second spiral bending tube 11; Another road is unnecessary gas, emptying by spinner-type flowmeter 10.Described spinner-type flowmeter, for shunting, utilizes the retardation of float to produce suitable malleation simultaneously, and mass flow controller is normally worked.
The gas of described second level dilution gas circuit again via air valve 2, through second spiral bending tube 11 fully mix after obtains dry work calibrating gas with together with the gas of F2 output through F4; Or the gas of described second level dilution gas circuit again via water vapor generation flow container 8, through second spiral bending tube 11 fully mix after obtains wet work calibrating gas with together with the gas of F2 output through F4.
Described water vapor generation flow container and ethanol saturated vapor generation flow container are basic identical, absolute pressure pressure transducer, saturated vapor gas outlet tube are also arranged at its top, the temperature sensor 13 measuring the temperature of a liquid is also housed, but water vapor generation flow container disposes heating arrangement in addition, make its temperature can be between room temperature to 35 ℃ selected control, the mixed gases of the gas that contains water vapor of its gas outlet tube output and F2 output, can obtain wet work calibrating gas.
Between air valve 2 and water vapor generation flow container 8, it is relation in parallel.When air valve is opened, the gas of F4 output enters the second spiral bending tube 11 through air valve, and its gas is not steam-laden dry gas.When air valve is closed, the gas of F4 output can only enter by the gas outlet tube of water vapor generation flow container 8 the second spiral bending tube 11, and its gas is the moisture that has comprised water vapor.
The gas of source of the gas output obtains the gas that contains ethanol after F1 and ethanol saturated vapor generation flow container, the gas that the gas that contains ethanol is exported by F3 dilutes, the process that completes dilution and mix in the first spiral bending tube 10, and deliver to the second spiral bending tube 11 by F2, so that acquisition work calibrating gas.By being provided with air valve in parallel and water vapor generation flow container 8, make air distributing device of the present invention can select easily the distribution pattern of dry gas or moisture, solved and can only select a kind of problem of gas in prior art, and between dry gas pattern and moisture pattern, changed convenient and swift.In addition, by for water vapor generation flow container 8, heating arrangement and temperature sensor being set, can control the temperature of output moisture.By four mass flow controllers, can export easily the flow adjustment of gas.
In described steam generation flow container, be provided with for measure the liquid in described steam generation flow container temperature temperature sensor 14 and for measuring the absolute pressure pressure transducer 15 of the pressure of the steam in described steam generation flow container; Within the lower end of the gas inlet tube 12 in described steam generation flow container is immersed in liquid, and be provided with gondola water faucet 16 in the bottom of gas inlet tube 12.By temperature sensor and pressure transducer, the air pressure in flow container and temperature are monitored.By adopting gondola water faucet, can make the gas that enters in flow container more even, and can reduce the pressure of ejection gas, thereby can not produce excessive impact to flow container bottom.
A Concentration Algorithm for saturated vapor method simulation alcoholicity of exhaled gas air distributing device described in basis, comprises the following steps,
The first step: the concentration C 0 of determining saturated vapour pressure according to the law of partial pressure;
Wherein, C 0 = P ( t ) P 0 × 10 6 - - - ( 1 ) ;
The vapor pressure that in formula (1), P (t) is saturated vapor, P 0for the absolute pressure of ethanol fluid reservoir upper gas, P (t) and P 0unit be kPa, C 0unit be mol/mol;
Second step: carry out first order dilution, obtain the gas concentration C after first order dilution 1, its dilution formula is as follows:
C 1 = Q 1 · P 0 P 0 - P ( t ) Q 1 · P 0 P 0 - P ( t ) + Q 3 · C 0 - - - ( 2 ) ;
In formula (2): Q 1for the flow of first order carrier band gas, Q 3for the flow of first order diluents, for at carrier band gas Q 1the lower flow that flows out saturated alcohol gas of effect; Q 1, Q 3with unit be ml/min;
The 3rd step: the Primordial Qi of obtaining second level diluents; By mass flow controller, obtain the Primordial Qi of second level diluents, unnecessary gas is emptying by spinner-type flowmeter; By mass flow controller, to various component gases, must revise, for air, the correction factor of air ethanol mixed gas is this coefficient k and concentration C 1relevant; Therefore, the flow Q of the Primordial Qi of second level diluents 2revise, actual flow is pressed kQ 2calculate;
The 4th step: carry out second level dilution, acquisition work calibrating gas; The diluting gas flow of second level dilution is Q 4, but need carry out humidification as this gas time, its flow should consider to add the amount of water vapor, need be calculated as follows:
Q 4 · P W 0 P W 0 - P w ( t ) - - - ( 3 ) ;
In formula (3): P w0absolute pressure for water fluid reservoir upper gas; P w(t) be water saturation vapor pressure, P w0and P w(t) unit is Pa;
So the gas concentration after secondary dilution is: C 2 = C 1 · k · Q 2 k · Q 2 + Q 4 · P W 0 P W 0 - P w ( t ) ;
The 5th step: the concentration unit to gas converts;
In above step, the unit of each concentration is mol/mol, according to parameters such as the conversion relation between international unit and ethanol density, is corresponding to alcohol concentration C (mg/100ml) in blood, by work with the unit conversion of the concentration of calibrating gas
C = 1 2.3712 · C 2 - - - ( 4 ) ;
Above process finally can be merged into complete formula:
C = 1 2.3712 · Q 1 · P 0 P 0 - P ( t ) Q 1 · P 0 P 0 - P ( t ) + Q 3 · k · Q 2 k · Q 2 + Q 4 · P W 0 P W 0 - P w ( t ) · P ( t ) P 0 × 10 6 - - - ( 5 ) ;
In formula (1)～formula (5): C is the concentration of output alcohol gas, and wherein the concentration of C has been converted as 100ml ethanol in blood content, and its unit is mg/100ml; Q 1for the flow of first order carrier band gas, its unit is ml/min; Q 2for sample flow after first order dilution, be the former airshed of second level dilution, its unit is ml/min; Q 3for the flow of first order diluents, its unit is ml/min; Q 4for the flow of second level diluents, its unit is ml/min; P 0for the absolute pressure of ethanol fluid reservoir upper gas, its unit is kPa; The saturated vapour pressure that P (t) is ethanol, its unit is kPa; P w0for the absolute pressure of water fluid reservoir upper gas, its unit is Pa; P w(t) be water saturation vapor pressure, its unit is Pa; K is mass flowmeter F 2correction factor to alcohol gas flow.
The purity of described ethanol is more than 99.7%, the vapor pressure P of its saturated vapor (t) (kPa) with liquid temp t(℃) be calculated as follows:
P(t)=1.531804522+0.09557199t+0.004167695t 2+0.0000668492t 3-0.0000000674931t 4+0.0000000124982t 5。
The vapor pressure P of described water saturation steam w(t) (Pa) with coolant-temperature gage t(℃) be calculated as follows:
P W(t)=611.05776+44.4645337t+1.41990447t 2+0.027265409t 3+0.000270627t 4+0.00000275384t 5。
Formula explanation: P (t) formula, in the < < chemurgy brief guide > > publishing according to Nanjing University 1989, " organic compound vapor pressure table " is less than the saturated vapour pressure data of ethanol under an atmospheric pressure (this table selected from Robert C.weast < < CRC Handbook of chemistry and Physics > > (63rd edition), 1982～1983, D-203), according to the method for power series undetermined coefficient (being the method for undetermined coefficients), obtain.
The saturated vapour pressure data of ethanol used
P w(t) formula according to common " list of water saturation vapor pressure ", disperse to be selected six points (select other effects identical) within the scope of normal temperature, also according to the method for power series undetermined coefficient, obtains.
Water saturation steaming pressure data used
Vapor pressure 935.223Pa 1402.51Pa 2197.57Pa 3168.74Pa 4495.02Pa 6279.33Pa
Temperature (℃) 6.0 12.0 19.0 25.0 31.0 37.0

Claims (3)

1. saturated vapor method simulation alcoholicity of exhaled gas air distributing device, is characterized in that, comprises source of the gas (1), mass flow controller, steam generation flow container, air valve (2), spinner-type flowmeter (3) and spiral bending tube; Mass flow controller comprises the first mass flow controller (4), the second mass flow controller (5), the 3rd mass flow controller (6) and the 4th mass flow controller (7); Steam generation flow container comprises water vapor generation flow container (8) and ethanol saturated vapor generation flow container (9); Spiral bending tube comprises the first spiral bending tube (10) and the second spiral bending tube (11);
The gas of described source of the gas (1) output is divided into three tunnel outputs: first via gas is successively by the 4th mass flow controller (7), water vapor generation flow container (8) and the second spiral bending tube (11) output, the second road gas is successively by the 3rd mass flow controller (6), the first spiral bending tube (10), the second mass flow controller (5) and the second spiral bending tube (11) output, Third Road gas is successively by the first mass flow controller (4), ethanol saturated vapor generation flow container (9), the first spiral bending tube (10), the second mass flow controller (5) and the second spiral bending tube (11) output, on the pipeline between described the first spiral bending tube (10) and the second mass flow controller (5), be provided with described spinner-type flowmeter (3), between the gas inlet tube (12) of described water vapor generation flow container (8) and gas outlet tube (13), be provided with described air valve (2).
2. saturated vapor method according to claim 1 is simulated alcoholicity of exhaled gas air distributing device, it is characterized in that, in described steam generation flow container, be provided with for measure the liquid in described steam generation flow container temperature temperature sensor (14) and for measuring the absolute pressure pressure transducer (15) of the pressure of the steam in described steam generation flow container; Within the lower end of the gas inlet tube (12) in described steam generation flow container is immersed in liquid, and be provided with gondola water faucet (16) in the bottom of gas inlet tube (12).
3. a Concentration Algorithm for saturated vapor method simulation alcoholicity of exhaled gas air distributing device according to claim 1, is characterized in that, comprises the following steps:
The first step: the concentration C of determining saturated vapour pressure according to the law of partial pressure 0(unit is mol/mol): the vapor pressure (kPa) that P in formula (t) is saturated vapor, P 0absolute pressure (kPa) for ethanol fluid reservoir upper gas;
Second step: carry out first order dilution, obtain the gas concentration C after first order dilution 1, its dilution formula is as follows: in formula: Q 1flow (ml/min) for first order carrier band gas; Q 3flow (ml/min) for first order diluents; for at carrier band gas Q 1the lower flow (ml/min) that flows out saturated alcohol gas of effect;
The 3rd step: the Primordial Qi of obtaining second level diluents; By mass flow controller, obtain the Primordial Qi of second level diluents, unnecessary gas is emptying by spinner-type flowmeter; By mass flow controller, to various component gases, must revise, for air, the correction factor of air ethanol mixed gas is this coefficient k and concentration C 1relevant; Therefore, the flow Q of the Primordial Qi of second level diluents 2revise, actual flow is pressed kQ 2calculate;
The 4th step: carry out second level dilution, acquisition work calibrating gas; The diluting gas flow of second level dilution is Q 4, but need carry out humidification as this gas time, its flow should consider to add the amount of water vapor, need be calculated as follows:
in formula: P w0absolute pressure (Pa) for water fluid reservoir upper gas; P w(t) be water saturation vapor pressure (Pa);
So the gas concentration after secondary dilution is: C 2 = C 1 &CenterDot; k &CenterDot; Q 2 k &CenterDot; Q 2 + Q 4 &CenterDot; P W 0 P W 0 - P w ( t )
The 5th step: the concentration unit of gas is converted according to related standards; In above step, the unit of each concentration is mol/mol, according to related standards, is scaled corresponding to alcohol concentration C (mg/100ml) in blood,
C = 1 2.3712 &CenterDot; C 2 ;
Above process finally can be merged into complete formula:
C = 1 2.3712 &CenterDot; Q 1 &CenterDot; P 0 P 0 - P ( t ) Q 1 &CenterDot; P 0 P 0 - P ( t ) + Q 3 &CenterDot; k &CenterDot; Q 2 k &CenterDot; Q 2 + Q 4 &CenterDot; P W 0 P W 0 - P w ( t ) &CenterDot; P ( t ) P 0 &times; 10 6 ;
In formula: the concentration that C is output alcohol gas (containing steam) has been converted as 100ml ethanol in blood content unit: mg/100ml; Q 1flow (ml/min) for first order carrier band gas; Q 2for sample flow after first order dilution, it is the former airshed (ml/min) of second level dilution; Q 3flow (ml/min) for first order diluents; Q 4flow (ml/min) for second level diluents; P 0absolute pressure (kPa) for ethanol fluid reservoir upper gas; The saturated vapour pressure (kPa) that P (t) is ethanol; P w0absolute pressure (Pa) for water fluid reservoir upper gas; P w(t) be water saturation vapor pressure (Pa); K is mass flowmeter F 2correction factor to alcohol gas flow.
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