CN113759416B - The method comprises the following steps of 220 Rn daughter state parameter regulation and control device and regulation and control method - Google Patents
The method comprises the following steps of 220 Rn daughter state parameter regulation and control device and regulation and control method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000000443 aerosol Substances 0.000 claims abstract description 206
- 238000009423 ventilation Methods 0.000 claims abstract description 90
- 230000001502 supplementing effect Effects 0.000 claims abstract description 54
- 230000001105 regulatory effect Effects 0.000 claims abstract description 26
- 239000000126 substance Substances 0.000 claims abstract description 6
- 230000000153 supplemental effect Effects 0.000 claims abstract description 5
- 238000005070 sampling Methods 0.000 claims description 63
- 238000010790 dilution Methods 0.000 claims description 34
- 239000012895 dilution Substances 0.000 claims description 34
- 230000000694 effects Effects 0.000 claims description 24
- 238000007865 diluting Methods 0.000 claims description 23
- 239000002245 particle Substances 0.000 claims description 15
- 230000008021 deposition Effects 0.000 claims description 13
- 230000001276 controlling effect Effects 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 10
- 238000005086 pumping Methods 0.000 claims description 8
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- 239000007788 liquid Substances 0.000 claims 2
- 238000013178 mathematical model Methods 0.000 claims 1
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 238000011049 filling Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000741 silica gel Substances 0.000 description 4
- 229910002027 silica gel Inorganic materials 0.000 description 4
- 229910052776 Thorium Inorganic materials 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 239000013589 supplement Substances 0.000 description 3
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 description 2
- 238000005273 aeration Methods 0.000 description 2
- 125000003275 alpha amino acid group Chemical group 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000004164 analytical calibration Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
Abstract
The present invention relates to a kind of 220 Rn daughter state parameter regulation and control device and method, and controller regulates parameters to be regulated according to the relation between state parameters and parameters to be regulated 220 The state parameters of the Rn sub-chamber are adjusted to target values, the parameters to be adjusted comprise the first ventilation rate of the charging loop and the second ventilation rate and/or aerosol concentration of the supplementing loop, and further the ventilation rate and the aerosol concentration are adjusted to realize 220 In Rn daughter chamber 220 Stable regulation and control of Rn sub-body state parameters, and after the regulation is finished, the charging loop works according to the first ventilation rate and continuously moves to 220 Rn daughter indoor input 220 Rn subvolumes, the supplemental circuit operating at a second ventilation rate and aerosol concentration, continuing to 220 And supplementing substances in the Rn sub-chamber, and stabilizing the state parameters at target values all the time.
Description
Technical Field
The present invention relates to 220 The technical field of Rn daughter state parameter regulation and control, in particular to a method for regulating and controlling Rn daughter state parameters 220 A regulation and control device and a regulation and control method for a plurality of state parameters of Rn daughter.
Background
China is a high-thorium background area and a large rare earth production country, and the environment cannot be ignored and the rare earth development and production process is performed 220 Rn and 220 the Rn daughter is exposed to hazards. 220 The half-life of Rn is short, 220 rn hazard mainly comes from 220 Rn daughter. Accurate evaluation 220 Rn daughter exposure hazard needs to be developed under various typical environmental conditions 220 Rn daughter concentration, unbound fraction, daughter activity ratio 212 Bi/ 212 Pb), and the like. For this purpose, it is necessary to establish a system capable of realizing different typical environmental conditions 220 Metering device for regulating and controlling state parameters such as Rn daughter concentration, unbound state share, daughter activity ratio and the like, and meets the requirements of 220 Rn sub-body state parameter measurement method and instrument scale calibration requirement, and monitoring site is ensured 220 Reliability of these data for Rn daughter concentration, unbound fraction, and daughter activity ratio.
Currently, established 220 Rn chambers are mostly aimed at 220 And (3) regulating and controlling the Rn concentration. The common disadvantages are: established 220 Rn indoor 220 The Rn daughter is mainly in a combined state, because 220 The unbound state deposition rate of Rn daughter is more than an order of magnitude higher than the bound state deposition rate 220 The Rn daughter is easier to deposit and adhere to the wall, so that 220 Stable regulation and control of unbound state of Rn daughter is difficult to achieve and lacks of functions for different types 220 Stable regulation and control of Rn sub-body state parameters cannot realize full simulation and reproduction of typical environmental conditions. Therefore, it is necessary to establish a stable adjustment of different kinds 220 The regulation and control device of Rn subbody state parameter solves above-mentioned problem, satisfies the measurement scale demand.
Disclosure of Invention
The invention aims to provide a method for manufacturing the LED display device 220 Rn daughter state parameter regulation and control device and method can realize 220 Stable regulation and control of Rn daughter state parameters to meet 220 Rn sub-body metering and instrument calibration requirements.
In order to achieve the above object, the present invention provides the following solutions:
the method comprises the following steps of 220 The regulation and control device for the Rn daughter state parameters comprises a controller, 220 An Rn sub-chamber, a source charging loop and a supplementing loop;
the controller is respectively in communication connection with the charging loop and the supplementing loop; both ends of the charging loop and both ends of the supplementing loop are connected with the 220 The Rn sub-chambers are connected;
the controller is used for adjusting the parameters to be adjusted according to the relation between the state parameters and the parameters to be adjusted 220 The state parameters of the Rn sub-chamber are adjusted to target values; the state parameter includes 220 Rn daughter concentration, unbound fraction and daughter activity ratio; the parameters to be adjusted comprise a first ventilation rate of the charging circuit and a second ventilation rate and/or aerosol concentration of the supplementing circuit;
the charging loop is used for working according to the first ventilation rate and continuously supplying the air to the air conditioner 220 Rn daughter indoor input 220 Rn daughter; the supplementary circuit is used for working according to the second ventilation rate and the aerosol concentration and continuously supplying the supplementary circuit to the air conditioner 220 The Rn daughter chamber is supplemented with substances.
In another aspect, the present invention is directed to providing a method of 220 A method for regulating and controlling parameters of an Rn daughter state, the method comprising:
judging whether the direction is needed according to the target value of the state parameter 220 Supplementing aerosol in the Rn daughter chamber to obtain a first judgment result;
when the first judgment result is yes, regulating the first ventilation rate of the charging loop and the second ventilation rate and/or aerosol concentration of the supplementing loop, and leading the charging loop to be connected with the air inlet valve 220 The state parameters of the Rn sub-chamber are adjusted to target values;
when the first judgment result is negative, adjusting the first ventilation rate of the charging loop and the second ventilation rate of the supplementing loop, and leading the charging loop to be connected with the air conditioner 220 The state parameters of the Rn sub-chamber are adjusted to target values.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention is used for providing a kind of 220 Rn daughter state parameter regulation and control device and method, and controller regulates parameters to be regulated according to the relation between state parameters and parameters to be regulated 220 The state parameters of the Rn sub-chamber are adjusted to target values, and the parameters to be adjusted comprise a first ventilation rate of the charging circuit and a second ventilation rate and/or aerosol concentration of the supplementing circuitDegree, and further by adjusting the ventilation rate and the aerosol concentration 220 In Rn daughter chamber 220 Stable regulation and control of Rn daughter state parameters. And after the regulation is finished, the charging loop is operated according to the first air exchange rate and continuously moves to 220 Rn daughter indoor input 220 Rn subvolumes, the supplemental circuit operating at a second ventilation rate and aerosol concentration, continuing to 220 Supplementing substances in Rn daughter chamber, thereby establishing 220 In Rn daughter chamber 220 Dynamic balance of Rn subvolume compensation and loss always stabilizes the state parameters at target values.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a regulating device according to embodiment 1 of the present invention.
Fig. 2 is a flow chart of the regulation method according to embodiment 2 of the present invention.
Symbol description:
1-a first constant flow pump; 2- 220 An Rn source; 3-an air filter; 4-a second gas three-way valve; 5-sampling pump; 6- 220 An Rn sub-chamber; 7-a second constant flow pump; 8-an aerosol dilution chamber; 9-a third constant flow pump; 10-an aerosol filter; 11-aerosol particle size spectrometer; 12-an aerosol generator; 13-a silica gel connecting pipe; 14-a first gas three-way valve.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a method for manufacturing the LED display device 220 Rn daughter state parameter regulation and control device and method can realize 220 Stable regulation and control of Rn daughter state parameters to meet 220 Rn sub-body state parameter metering and instrument scale.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1:
to realize 220 Stable regulation and control of Rn daughter state parameters requires the presetting of parameters to be regulated which affect the state parameters. Therefore, before introducing the control device used in the present embodiment, the following steps are adopted 212 For example, pb (ThB) daughter control methods determine parameters to be adjusted that affect the state parameters. In the process of regulating and controlling ThB daughter, thB is completely composed of 220 Rn Source filling 220 In Rn sub-compartments 220 Rn emanations decay and take into account the decay of ThB itself, coanda, deposition and ventilation losses, 220 the variation of ThB subvolume concentration within the Rn subvolume can be described by the following first order differential equation. 220 Activity concentration C of unbound ThB in Rn sub-chamber f ThB (the unit is Bq.m -3 ) The rate of change of (2) is:
in the formula (1), lambda ThB Decay constant of ThB, its value is 0.065h -1 ；Is in an unbound state 216 The activity concentration of Po (ThA) (unit is Bq.m -3 ) The method comprises the steps of carrying out a first treatment on the surface of the χ is the rate of binding of unbound daughter to aerosol, which is a function of aerosol particle size and concentration; v a Is that 220 Total ventilation rate of Rn sub-chamber; v is 220 Volume of Rn sub-chamber, m 3 ；/>Deposition wall attachment rate for unbound ThB.
At the position of 220 When the daughter concentration in the Rn daughter chamber is balanced, the formula (1) becomes:
in the formula (2), the calculation formula of χ is as follows:
in the formula (3), D f Diffusion coefficient for unbound daughter; v 0 An average thermal motion rate in air for unbound daughter; d is aerosol particle size; delta 0 ＝(d/2)+L 0 ，L 0 Is the mean free path of unbound daughter; n (d) is the aerosol concentration.
220 The half-life of ThA in Rn daughter is only 0.15s, the decay constant lambda of ThA ThA 16632h -1 Much greater than the deposition and aeration rate, so the deposition and aeration losses of ThA can be ignored. The concentration of unbound ThA can be determined from formula (4):
in the formula (4), C Tn Is that 220 Thorium injection in Rn sub-chamber 220 Rn) concentration.
Activity concentration of ThB daughter in bound stateThe formula is:
in the formula (5), the amino acid sequence of the compound,the deposition wall attachment rate is the combined state ThB.
Stable concentration C of ThB ThB The method comprises the following steps:
unbound fraction f of ThB ThB The method comprises the following steps:
the formulae (4) to (7) establish the relationship between the ThB stable concentration and the unbound fraction and the related variables.
Assuming that the behavior of ThC daughter is the same as that of ThB, the activity concentration of the non-conjugated ThC can be obtainedActivity concentration in the ThC-bound state +.>The expression of (2) is:
in the formula (8), lambda ThC Decay constant of ThC;deposition wall attachment rate for unbound ThC.
In the formula (9), the amino acid sequence of the compound,deposition wall attachment rate for the combined state ThC.
According to the unbound fraction f of ThC ThC Can be used to determine the unbound fraction f of ThC ThC ：
The concentration of the unbound daughter of ThC in the environment is extremely low and negligible with respect to the concentration of the unbound daughter of ThC in the bound state, so that the expressions of the unbound ThC/ThB activity ratio and the bound ThC/ThB activity ratio can be found according to the formulas (4), (5), (8) and (9):
as can be seen from the above, in 220 In the case where the concentration of Rn is constant, 220 the influence factors of Rn daughter concentration, unbound fraction and ThC/ThB activity ratio are aerosol concentration, aerosol particle size, 220 The Rn daughter coanda rate and the ventilation rate, wherein the aerosol concentration and the ventilation rate are relatively easy to adjust and control. By stably controlling two influencing factors of aerosol concentration and ventilation rate, it can be ensured that 220 The Rn subbody state parameters run steadily for a long time.
Based on this conclusion, the present embodiment is for providing a kind of 220 The regulation and control device of the Rn daughter state parameters is shown in figure 1, and comprises a controller, 220 An Rn sub-chamber 6, a charging circuit and a supplementing circuit, 220 the volume of the Rn sub-chamber 6 may be 0.443m 3 . The controller is respectively connected with the charging loop and the supplementing loop in a communication way, and the two ends of the charging loop and the supplementing loopBoth ends are provided with 220 The Rn sub-chamber 6 is connected.
The controller is used for adjusting the parameters to be adjusted according to the relation between the state parameters and the parameters to be adjusted, namely according to the formulas (7), (10), (11) and (12) 220 The state parameters of the Rn sub-chamber 6 are adjusted to target values. The status parameters include 220 Rn daughter concentration, unbound fraction, and daughter activity ratio. The parameters to be adjusted include a first ventilation rate of the charging circuit, a second ventilation rate of the replenishment circuit, and/or an aerosol concentration. Since the total ventilation rate is the sum of the first ventilation rate of the charging circuit and the second ventilation rate of the replenishment circuit, this is achieved by adjusting the first ventilation rate and the second ventilation rate when adjusting the total ventilation rate. Due to 220 The Rn subvolume concentration is primarily related to the first ventilation rate of the charge circuit, and is achieved by adjusting the first ventilation rate 220 Stable regulation and control of Rn daughter concentration, and at the same time, the regulation is well carried out 220 After the Rn daughter concentration, the second ventilation rate and/or aerosol concentration of the supplemental circuit is adjusted according to formulas (7), (10), (11) and (12) to establish an aerosol concentration and ventilation rate and 220 a functional relationship between the state parameters of the Rn sub-chamber 6 such that 220 The regulation and control of the unbound fraction of the Rn sub-chamber 6 and the activity ratio ThC/ThB are quantified, and the regulation becomes convenient, quick and reliable. Through aerosol concentration, 220 Stable regulation and control of total ventilation rate of Rn sub-chamber 6 can be realized 220 Stable regulation of state parameters in the Rn sub-chamber 6.
The charging loop is used for working according to a first air exchange rate and continuously directing to 220 Rn sub-chamber 6 in-house input 220 Rn, thereby producing 220 Rn daughter. The supplementary circuit is used for working according to the second ventilation rate and aerosol concentration and continuously facing 220 The Rn sub-chamber 6 is filled with a substance. After the adjustment of the parameters to be adjusted is realized, the charging loop and the supplementing loop work according to the size of the parameters after adjustment, so that the charging loop and the supplementing loop can be used for adjusting 220 The state parameters of the Rn sub-chamber 6 are always maintained at target values to realize 220 Dynamic balancing of the Rn sub-chamber 6 state parameters.
Specifically, the present inventionThe charging loop of the embodiment comprises a first constant flow pump 1, 220 An Rn source 2 and an air filter 3, the first constant flow pump 1 may be a small flow rate constant flow pump, 220 rn source 2 may be a gas-flowing solid 220 The Rn source, the air filter 3 may be a high efficiency filter. One end of the first constant flow pump 1 220 The Rn sub-chamber 6 is connected with the other end of the first constant flow pump 1 220 One end of the Rn source 2 is connected, 220 the other end of the Rn source 2 is connected with one end of an air filter 3, and the other end of the air filter 3 is connected with 220 The Rn sub-chamber 6 is connected. Namely a first constant flow pump 1, 220 After the Rn source 2 and the air filter 3 are connected in sequence, two ends are respectively connected with 220 The Rn sub-chamber 6 is connected to form a closed-loop charge circuit. The first constant flow pump 1 is used for pumping air from the air source according to a first air exchange rate 220 A gas flow is extracted from the Rn sub-chamber 6 and passes through the chamber at a first ventilation rate 220 An Rn source 2, 220 rn Source 2 is used for generating under the action of airflow 220 Rn, and will 220 Rn is input to the air filter 3 220 Rn sub-chamber 6, forming a closed loop to provide a closed loop 220 High and stable concentration is established in Rn sub-chamber 6 220 Rn daughter.
The replenishment circuit of the present embodiment includes an air replenishment branch and an aerosol replenishment branch. The controller is used for judging whether the direction is needed according to the target value 220 The Rn sub-chamber 6 is filled with aerosol, and when the aerosol is not needed to be filled, the air filling branch is controlled to work, and when the aerosol is needed to be filled, the aerosol filling branch is controlled to work. Specifically, the control mode of the controller is that a switch K1 is arranged on the air supplementing branch, and switches K2 and K3 are arranged on the aerosol supplementing branch, when the air supplementing branch needs to be turned on 220 When the Rn sub-chamber 6 is filled with aerosol, the controller controls K1 to be closed, and simultaneously controls K2 and K3 to be opened, so that the aerosol filling branch is put into operation. In the absence of need to direct 220 When the aerosol is replenished in the Rn sub-chamber 6, the controller controls K1 to be opened, and simultaneously controls K2 and K3 to be closed, so that the air replenishing branch is put into operation. The air supplementing branch is used for working according to the second ventilation rate and continuously filtering 220 The daughter and aerosol within the Rn daughter chamber 6. The aerosol supplement branch being for following the firstTwo air exchange rates and aerosol concentration are operated to 220 The Rn sub-chamber 6 is filled with aerosol.
Further, the air supplementing branch comprises a second constant flow pump 7, a first gas three-way valve 14, a second gas three-way valve 4 and an air filter 3. One end of the second constant flow pump 7 220 The Rn sub-chamber 6 is connected with the other end of the second constant flow pump 7 and the first end of the first gas three-way valve 14, the second end of the first gas three-way valve 14 and the first end of the second gas three-way valve 4 are connected, the second end of the second gas three-way valve 4 and one end of the air filter 3 are connected, and the other end of the air filter 3 and 220 the Rn sub-chamber 6 is connected. A second constant flow pump 7 is used for pumping at a second air exchange rate 220 The Rn sub-chamber 6 draws in a gas flow and inputs the gas flow to the air filter 3 through the first gas three-way valve 14, the second gas three-way valve 4. The air filter 3 is used for the air flow 220 Filtering Rn daughter and aerosol to obtain filtered air, and inputting the filtered air into 220 Rn sub-chamber 6.
The aerosol replenishment branch comprises a second constant flow pump 7, a first gas three-way valve 14 and an aerosol dilution chamber 8. One end of the second constant flow pump 7 220 The Rn sub-chamber 6 is connected with the other end of the second constant flow pump 7 and the first end of the first gas three-way valve 14, the third end of the first gas three-way valve 14 is connected with one end of the aerosol diluting chamber 8, and the other end of the aerosol diluting chamber 8 is connected with 220 The Rn sub-chamber 6 is connected. A second constant flow pump 7 is used for pumping at a second air exchange rate 220 A gas flow is drawn in the Rn sub-chamber 6 and is fed to the aerosol dilution chamber 8 through a first gas three-way valve 14. The aerosol diluting chamber 8 stores aerosol, and the aerosol diluting chamber 8 is used for being directed under the action of airflow 220 The Rn sub-chamber 6 is filled with aerosol.
Based on the specific structures of the aerosol supplementing branch and the air supplementing branch, the working process of the supplementing loop is as follows: when it is not needed to be oriented 220 When aerosol is injected into the Rn sub-chamber 6, the switch K1 is opened, the switches K2 and K3 are both opened, and the second constant flow pump 7 is used for introducing air at a second air exchange rate 220 Rn daughter chamber 6 pumpTaking the air flow, and leading the air flow back to the air filter 3 after passing through the first air three-way valve 14, the second air three-way valve 4 220 The Rn sub-chamber 6 constitutes a closed cycle. When it is needed to be directed to 220 When aerosol is injected into the Rn sub-chamber 6, the switch K1 is turned off, the switches K2 and K3 are both turned on, and the second constant flow pump 7 is used for introducing air at a second air exchange rate 220 The Rn sub-chamber 6 draws a gas flow and enters the aerosol dilution chamber 8 through the first gas three-way valve 14, due to 220 The pressure difference between the Rn sub-chamber 6 and the aerosol dilution chamber 8 will cause the aerosol in the aerosol dilution chamber 8 to enter through the silica gel connection tube 13 220 In the Rn sub-chamber 6, a closed cycle is constituted.
It should be noted that the volume of the aerosol diluting chamber 8 may be 2.7m 3 A silica gel connection tube 13 is used to realize the aerosol diluting chamber 8 and 220 the connection between Rn sub-chamber 6, switch K1 may be disposed between first gas three-way valve 14 and second gas three-way valve 4, switch K2 may be disposed between first gas three-way valve 14 and aerosol dilution chamber 8, and switch K3 may be disposed on silicone connection tube 13.
In addition, the control device of the present embodiment further includes an aerosol generator 12, and the aerosol generator 12 may be a condensation type monodisperse aerosol generator manufactured by TSI company of usa. The aerosol generator 12 communicates with the aerosol dilution chamber 8, and the aerosol generator 12 supplements the aerosol into the aerosol dilution chamber 8 at equal intervals. The embodiment further comprises an aerosol dilution circuit, the aerosol dilution circuit comprises an aerosol dilution chamber 8, an aerosol filter 10 and a third constant flow pump 9, the aerosol dilution chamber 8, the aerosol filter 10 and the third constant flow pump 9 form a closed cycle, the third constant flow pump 9 is used for pumping air flow to the aerosol dilution chamber 8, and the aerosol filter 10 is used for filtering aerosol in the air flow so as to dilute the aerosol in the aerosol dilution chamber 8. The present embodiment adjusts the aerosol concentration in the aerosol dilution chamber 8 by controlling the time interval for replenishing the aerosol into the aerosol dilution chamber 8 by the aerosol generator 12 and the flow rate of the third constant flow pump 9, thereby causing 220 The aerosol concentration in the Rn sub-chamber 6 is stable at different levels. The aerosol dilution circuit is arranged to enable the aerosol to be emittedThe high concentration aerosol produced by the generator 12 is diluted while avoiding large fluctuations in aerosol concentration and achieving 220 Stable control of monodisperse aerosols at low concentration ranges in the Rn daughter chamber 6.
Based on the specific structures of the charging circuit and the supplementing circuit, the charging circuit is formed by 220 Generated by Rn source 2 220 Rn jet is continuously fed by a first constant flow pump 1 220 Rn sub-chamber 6 such that 220 In Rn sub-chamber 6 220 Rn sub-body is continuously increased, and air supplementing branch in supplementing loop is extracted 220 The flow of Rn sub-chamber 6 is reinjected through air filter 3 220 Rn sub-chamber 6 such that 220 In Rn sub-chamber 6 220 Rn daughter is continuously lost, and then the stable operation of the charging loop and the supplementing loop is realized 220 In Rn sub-chamber 6 220 Rn daughter growth and loss reach balance, and then can be established 220 In Rn sub-chamber 6 220 Dynamic balance of Rn daughter compensation and loss, avoiding 220 In Rn sub-chamber 6 220 The accumulation process of more than three days required for the re-establishment of the Rn daughter concentration equilibrium. And when the aerosol is required to be replenished, the aerosol replenishing branch in the replenishing loop continuously faces to 220 The Rn sub-chamber 6 is filled with aerosol, and the process of extracting the air flow of the air filling branch in the filling loop and the filling loop allows the concentration of the aerosol to be reduced at a stable rate, so that the aerosol can be matched with the air 220 The aerosol concentration in the Rn sub-chamber 6 is balanced by the supplemental increase.
Because the scale instrument samples large flow or samples for a long time, the scale instrument is extremely easy to cause 220 In Rn sub-chamber 6 220 A change in the state of the Rn daughter aerosol, such that the Rn daughter aerosol is initially at a stable concentration 220 The unbound fraction of Rn daughter is continuously reduced 220 Change in the activity ratio of Rn daughter. To solve this problem, the regulation device of the present embodiment further includes an analog sampling loop. The analog sampling circuit comprises a sampling pump 5, a second gas three-way valve 4 and an air filter 3. One end of the sampling pump 5 is connected with 220 The Rn sub-chamber 6 is connected with the other end of the sampling pump 5 is connected with the third end of the second gas three-way valve 4, and the second gas three-way valve 4A second end is connected with one end of the air filter 3, and the other end of the air filter 3 is connected with 220 The Rn sub-chamber 6 is connected. In order to avoid the influence on the state parameter when sampling is performed by using the analog sampling circuit, the controller is used for adjusting the second ventilation rate of the supplementing circuit while controlling the analog sampling circuit to work, so that the adjusted ventilation rate of the supplementing circuit is equal to the difference between the second ventilation rate and the third ventilation rate of the analog sampling circuit. The sampling pump 5 is used to pump air from the air at a third air exchange rate 220 The Rn sub-chamber 6 draws a gas flow and feeds the gas flow through the second gas three-way valve 4 to the air filter 3, the air filter 3 serving to filter aerosols and aerosols from the gas flow 220 Filtering Rn daughter to obtain filtered air, and inputting the filtered air into 220 Rn sub-chamber 6.
In particular, when sampling is performed using an analog sampling circuit, the sampling pump 5 air inlet is directly connected to a sampling device for sampling a sub-volume in the air flow at a rate less than the third ventilation rate. Further, during sampling, the air flow pumped by the sampling pump 5 is led back to the air filter 3 through the second air three-way valve 4 at a third air exchange rate 220 The Rn sub-chamber 6 forms a closed cycle, and the third ventilation rate is ensured to be stable no matter whether sampling exists or not, thereby avoiding the sampling 220 The neutron concentration state in the Rn daughter chamber 6 changes. By setting up an analog sampling loop, the method enables 220 Rn sub-chamber 6 the loss of sub-body at constant rate, eliminating 220 Sub-sampling during application of Rn sub-chamber 6 results in 220 Instability of Rn sub-body state parameters, and the gas path enables 220 The Rn sub-chamber 6 has a certain airflow, and can be realized without stirring by a fan 220 Rn daughter is uniformly distributed, avoiding the traditional 220 Rn chamber using fan belt 220 And the stable control of the Rn subbody state parameters is difficult to realize.
As an alternative implementation manner, the adjusting and controlling device of the embodiment further comprises an aerosol particle size spectrometer 11, wherein the aerosol particle size spectrometer 11 is respectively connected with 220 The Rn sub-body chamber 6 and the aerosol diluting chamber 8 are communicated, and the connection between the aerosol particle size spectrometer 11 and the aerosol diluting chamber 8A switch K4 is arranged on the loop, and the aerosol particle diameter spectrometer 11 and 220 a switch K5 is arranged on the connection loop of the Rn sub-chamber 6. By the controller opening the relevant switch, the control can be used for 220 The aerosol concentration and particle size in the Rn daughter chamber 6 or the aerosol dilution chamber 8 were analyzed. The aerosol particle size spectrometer 11 may be a nano-scale aerosol particle size spectrometer manufactured by TSI corporation of the united states of america for monitoring the concentration and particle size distribution of the aerosol.
In this embodiment, when sampling is needed, the analog sampling loop is opened, and the ventilation rate of the supplementary loop is adjusted at the same time, and after the analog sampling loop is opened, sampling is performed at a third ventilation rate smaller than that of the analog sampling loop, so that the influence of the sampling process on the state parameters can be avoided. Of course, the embodiment may also set the analog sampling circuit to be always on, and adjust the state parameter by adjusting the first ventilation rate of the charging circuit, the second ventilation rate and/or the aerosol concentration of the charging circuit, and the third ventilation rate of the analog sampling circuit. Meanwhile, when sampling is performed, the third ventilation rate smaller than that of the analog sampling loop is used for sampling, and the influence of the sampling process on the state parameters can be avoided.
The embodiment relates to a method of 220 In Rn daughter metering device 220 Rn sub-body state parameter control technology, in particular convenient and quick realization 220 The Rn subbody state parameters are regulated and controlled stably so as to meet the requirements of state parameter measurement methods and instrument scales. The aerosol concentration in the aerosol diluting chamber 8 is regulated by changing the interval time of inputting the aerosol into the aerosol diluting chamber 8 by the aerosol generator 12 and the flow rate of the third constant flow pump 9 220 Aerosol concentration in Rn sub-chamber 6, in combination with changes 220 The total ventilation rate of the Rn chamber can be regulated to be different 220 Stable concentration of Rn daughter, unbound fraction, thC/ThB activity ratio, etc 220 And the Rn daughter state parameters realize stable regulation and control of the state parameters.
Example 2:
the embodiment is used for providing a kind of 220 The regulation and control method of the Rn daughter state parameters controls the regulation and control device described in the embodiment 1 to work,as shown in fig. 2, the regulation method includes:
s1: judging whether the direction is needed according to the target value of the state parameter 220 Supplementing aerosol in the Rn daughter chamber to obtain a first judgment result;
s2: when the first judgment result is yes, regulating the first ventilation rate of the charging loop and the second ventilation rate and/or aerosol concentration of the supplementing loop, and leading the charging loop to be connected with the air inlet valve 220 The state parameters of the Rn sub-chamber are adjusted to target values;
s3: when the first judgment result is negative, adjusting the first ventilation rate of the charging loop and the second ventilation rate of the supplementing loop, and leading the charging loop to be connected with the air conditioner 220 The state parameters of the Rn sub-chamber are adjusted to target values.
In particular, adjusting the aerosol concentration may include: the aerosol concentration in the aerosol dilution chamber 8 is adjusted by adjusting the interval of the aerosol generator 12 feeding aerosol into the aerosol dilution chamber 8 to adjust the aerosol input and by adjusting the flow rate of the third constant flow pump 9 to adjust the rate of aerosol filtration loss in the aerosol dilution chamber 8.
Adjusting the first ventilation rate of the charging circuit and the second ventilation rate of the replenishment circuit specifically includes: adjusting the first ventilation rate of the charging loop by adjusting the flow rate of the first constant flow pump; the second ventilation rate of the make-up circuit is adjusted by adjusting the flow rate of the second constant flow pump.
When the analog sampling loop is always on, the regulation method of the embodiment regulates the first ventilation rate of the charging loop, the second ventilation rate and/or aerosol concentration of the supplementing loop and the third ventilation rate of the analog sampling loop after the first judgment result is obtained, and when the first judgment result is yes 220 The state parameters of the Rn sub-chamber are adjusted to target values. When the first judgment result is negative, the first air exchange rate of the charging loop, the second air exchange rate of the supplementing loop and the third air exchange rate of the analog sampling loop are regulated 220 The state parameters of the Rn sub-chamber are adjusted to target values.
The specific regulation and control method comprises the following steps: the flow rate is less than 5L min -1 Is constant at first level of (2)The flow pump is at a first air exchange rate V 1 Extraction of 220 Thorium gas generated by Rn source 220 Rn) and input to 220 Rn sub-chamber. When aerosol is not needed to be injected, the switch K1 is opened, the switches K2 and K3 are disconnected, the analog sampling loop driven by the sampling pump at the third air exchange rate and the air supplementing branch driven by the second constant flow pump at the second air exchange rate are connected in parallel through the second air three-way valve, and the air supplementing branch is made to pass through the air filter 220 In Rn sub-chambers 220 Rn daughter and aerosol concentrations are continually lost. When aerosol needs to be injected, the switch K1 is disconnected, the switches K2 and K3 are opened, and the aerosol supplementing branch driven by the second constant flow pump at the second air exchange rate enters the aerosol diluting chamber by means of the second constant flow pump 220 The pressure difference between the Rn sub-chamber and the aerosol dilution chamber enables the aerosol in the aerosol dilution chamber to enter through the silica gel connecting pipe 220 Rn sub-chamber, such that aerosol dilution chamber and 220 the aerosol concentration in the Rn sub-chamber reaches a stable dynamic balance. The aerosol generator is used for supplementing the aerosol into the aerosol diluting chamber in equal quantity at equal time intervals, different levels of the concentration of the aerosol in the aerosol diluting chamber are adjusted by adjusting the time intervals and the speed of a third constant flow pump in the aerosol diluting loop, and an aerosol particle size spectrometer is used for monitoring the concentration and the particle size of the aerosol. When sub-sampling is carried out, sampling can be carried out between the second gas three-way valve and the sampling pump at a rate smaller than the third ventilation rate, and the sampled gas flow discharged by the gas is connected to the air filter, so that the sampling is a branch bypass of an analog sampling loop, the third ventilation rate of the sampling pump is not influenced by sampling or not, and the sub-sampling is eliminated 220 Rn daughter chamber 220 Fluctuations in concentration and unbound fraction of Rn daughter are maintained 220 Dynamic balance in Rn sub-chamber.
220 The Rn sub-chamber is filled with air after passing through an air filter in parallel at a third air exchange rate of 5L/min and a second air exchange rate of 3L/min by an analog sampling loop without aerosol replenishment 220 Rn daughter chamber, will 220 Aerosol filtering out of Rn sub-chamber, can filter out 220 The aerosol regulation of Rn daughter chamber is 35+/-26 cm -3 Real worldThe experimental measurement shows that the unbound fraction of the ThB can be maintained to be (99+/-0.2)% (stability 0.2%) for stable operation, 212 pb average concentration was 528Bq/m 3 (stability 5%), 212 the unbound Bi fraction can be maintained at (96.9.+ -. 0.53)%, at which point the ThC/ThB activity ratio is 0.13.+ -. 0.02. 220 The Rn sub-body chamber is communicated with an aerosol dilution chamber, aerosol with the median diameter of about 100nm is filled into the aerosol dilution chamber through an aerosol generator, 220 the aerosol concentration in the Rn daughter chamber also increases. The aerosol generator supplements the aerosol in the aerosol dilution chamber at an aerosol rate of about 10000 per minute, and the aerosol in the dilution chamber decays at a rate of about 700 per minute, with the supplementation being spaced such that the aerosol concentration in the aerosol dilution chamber remains relatively stable. Adjusting aerosol conditions of different stable concentrations by adjusting the interval time of the aerosol generator input 220 The stable control of the Rn daughter chamber aerosol is 1246+/-137 cm -3 In the process, the experiment shows that the fraction of the non-combined state of the ThB can be maintained at (27.2+/-1.4)% (the stability is 9.9%) to stably run, 212 pb average concentration of 1424Bq/m 3 (stability 10.4%), 212 the unbound Bi fraction can be maintained at (10.7.+ -. 2.4)%, at which point the ThC/ThB activity ratio is 0.31.+ -. 0.03.
In this specification, each embodiment is mainly described in the specification, which is different from other embodiments, and the same similar parts between the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (9)
1. The method comprises the following steps of 220 The regulation and control device for the Rn daughter state parameters is characterized by comprising a controller, 220 An Rn sub-chamber, a source charging loop and a supplementing loop;
the controller is divided intoThe charging circuit is respectively connected with the charging circuit and the supplementing circuit in a communication way; both ends of the charging loop and both ends of the supplementing loop are connected with the 220 The Rn sub-chambers are connected;
the controller is used for according to the mathematical model between the state parameter and the parameter to be adjusted established, specifically according to the formula:
f in ThB As unbound fraction of ThB, lambda ThB Decay constant of ThB, its value is 0.065h -1 ，Is in an unbound state 216 The activity concentration of Po (ThA) is expressed in Bq.m -3 χ is the rate of binding of unbound daughter to aerosol, which is a function of aerosol particle size and concentration, v a Is that 220 Total ventilation rate of Rn sub-chamber, V is 220 The volume of the Rn sub-chamber is given in m 3 ，/>Deposition wall attachment rate for combined ThB, < ->Deposition wall attachment rate for unbound ThB;
f in ThC For the concentration of ThC unbound daughter,is the activity concentration of unbound ThB, lambda ThC For decay constant of ThC, +.>Deposition wall attachment rate for unbound ThC,>activity concentration of ThB daughter in bound form, < ->Is the activity concentration of the non-binding state of ThC, < >>Deposition wall attachment rate for the combined state ThC;
in the middle ofActivity concentration in the ThC bound state;
adjusting the parameters to be adjusted 220 The state parameters of the Rn sub-chamber are adjusted to target values; the state parameter includes 220 Rn daughter concentration, unbound fraction and daughter activity ratio; the parameters to be adjusted comprise a first ventilation rate of the charging circuit and a second ventilation rate and/or aerosol concentration of the supplementing circuit;
the charging loop is used for working according to the first ventilation rate and continuously supplying the air to the air conditioner 220 Rn daughter indoor input 220 Rn daughter; the supplementary circuit is used for working according to the second ventilation rate and the aerosol concentration and continuously supplying the supplementary circuit to the air conditioner 220 Rn seedSupplementary substances in the body chamber;
adjusting the aerosol concentration includes: adjusting the aerosol concentration in the aerosol dilution chamber by adjusting the interval of aerosol input by the aerosol generator to the aerosol dilution chamber to adjust the aerosol input and by adjusting the flow rate of the third constant flow pump to adjust the rate of aerosol filtration loss in the aerosol dilution chamber;
the regulation and control device also comprises an analog sampling loop; the analog sampling loop includes a sampling pump for pumping the liquid from the liquid source at a third ventilation rate 220 Extracting air flow from the Rn sub-chamber, and inputting the air flow to an air filter through a second air three-way valve; the air filter is used for filtering the airflow to obtain filtered air, and inputting the filtered air into the air filter 220 An Rn sub-chamber;
the controller is used for adjusting the second ventilation rate of the supplementing loop while controlling the analog sampling loop to work, so that the adjusted ventilation rate of the supplementing loop is equal to the difference between the second ventilation rate and the third ventilation rate of the analog sampling loop.
2. The regulating device of claim 1, wherein the charge circuit comprises a first constant flow pump, 220 An Rn source and an air filter; one end of the first constant flow pump is connected with the first constant flow pump 220 The Rn sub-chamber is connected with the other end of the first constant flow pump 220 One end of the Rn source is connected; the said 220 The other end of the Rn source is connected with one end of the air filter; the other end of the air filter is connected with the 220 The Rn sub-chambers are connected;
the first constant flow pump is used for pumping the air from the first air exchange rate 220 Extracting a gas stream from the Rn sub-chamber; the said 220 An Rn source is used for generating under the action of the airflow 220 Rn, and subjecting said 220 Rn is input to the air filter 220 Rn sub-chamber.
3. The regulation device of claim 1, wherein the replenishment circuit comprises an air replenishment branch and an aerosol replenishment branch;
the controller is used for judging whether the target value needs to be oriented to the 220 The indoor aerosol supplementing of Rn daughter controls the air supplementing branch to work when the aerosol is not needed to be supplemented, and controls the aerosol supplementing branch to work when the aerosol is needed to be supplemented;
the air supplementing branch is used for working according to the second ventilation rate and is used for controlling the air supplementing branch to work according to the second ventilation rate 220 Filtering substances in the Rn daughter chamber;
the aerosol replenishment branch is configured to operate at the second ventilation rate and the aerosol concentration toward the 220 The Rn daughter chamber was replenished with aerosol.
4. A regulating device according to claim 3, wherein the air replenishment branch comprises a second constant flow pump, a first gas three-way valve, a second gas three-way valve and an air filter; one end of the second constant flow pump is connected with the first constant flow pump 220 The Rn sub-chamber is connected, and the other end of the second constant flow pump is connected with the first end of the first gas three-way valve; the second end of the first gas three-way valve is connected with the first end of the second gas three-way valve; the second end of the second gas three-way valve is connected with one end of the air filter; the other end of the air filter is connected with the 220 The Rn sub-chambers are connected;
the second constant flow pump is used for pumping the air from the air inlet to the air outlet at the second air exchange rate 220 Extracting air flow from the Rn sub-chamber, and inputting the air flow to the air filter through the first air three-way valve and the second air three-way valve; the air filter is used for filtering the airflow to obtain filtered air, and inputting the filtered air into the air filter 220 Rn sub-chamber.
5. A regulating device in accordance with claim 3, wherein the aerosol replenishment branch comprises a firstThe device comprises two constant flow pumps, a first gas three-way valve and an aerosol diluting chamber; one end of the second constant flow pump is connected with the first constant flow pump 220 The Rn sub-chamber is connected, and the other end of the second constant flow pump is connected with the first end of the first gas three-way valve; the third end of the first gas three-way valve is connected with one end of the aerosol diluting chamber; the other end of the aerosol diluting chamber is connected with the 220 The Rn sub-chambers are connected;
the second constant flow pump is used for pumping the air from the air inlet to the air outlet at the second air exchange rate 220 Extracting an air flow from the Rn sub-chamber, and inputting the air flow into the aerosol diluting chamber through the first air three-way valve; the aerosol diluting chamber is used for storing aerosol in the aerosol diluting chamber, and the aerosol diluting chamber is used for leading the aerosol to the air flow 220 Aerosol is input into the Rn sub-chamber.
6. The regulation device of claim 1, wherein the analog sampling circuit further comprises a second gas three-way valve and an air filter; one end of the sampling pump is connected with the 220 The Rn sub-chamber is connected, and the other end of the sampling pump is connected with the third end of the second gas three-way valve; the second end of the second gas three-way valve is connected with one end of the air filter, and the other end of the air filter is connected with the air filter 220 The Rn sub-compartments are connected.
7. The regulating device of claim 6, wherein the sampling pump inlet is coupled to a sampling device for sampling a sub-volume of the flow of gas at a rate less than the third ventilation rate.
8. Use of a device according to claim 1 220 Regulation and control device for Rn sub-body state parameters 220 The Rn daughter state parameter regulation and control method is characterized by comprising the following steps:
judging whether the direction is needed according to the target value of the state parameter 220 Supplementing aerosol in Rn daughter chamber to obtain a first judgment junctionFruit;
when the first judgment result is yes, regulating the first ventilation rate of the charging loop and the second ventilation rate and/or aerosol concentration of the supplementing loop, and leading the charging loop to be connected with the air inlet valve 220 The state parameters of the Rn sub-chamber are adjusted to target values;
when the first judgment result is negative, adjusting the first ventilation rate of the charging loop and the second ventilation rate of the supplementing loop, and leading the charging loop to be connected with the air conditioner 220 The state parameters of the Rn sub-chamber are adjusted to target values;
the said will 220 The state parameters of the Rn sub-chamber are adjusted to target values according to the above formulas (7), (10), (11) and (12);
the adjusting of the aerosol concentration specifically comprises:
the aerosol concentration of the supplementing loop is regulated by regulating the interval time of inputting aerosol into the aerosol diluting chamber by the aerosol generator and the flow rate of the third constant flow pump and depending on the dilution effect of the volume of the aerosol diluting chamber;
when sampling is performed by using the analog sampling loop, the air flow pumped by the sampling pump is led back to the air filter through the second air three-way valve and the air filter at a third air exchange rate 220 Forming closed circulation in the Rn sub-chamber; and the controller adjusts the second ventilation rate of the supplementary circuit so that the adjusted ventilation rate of the supplementary circuit is equal to the difference between the second ventilation rate and the third ventilation rate of the analog sampling circuit.
9. The method of regulating of claim 8, wherein regulating the first ventilation rate of the charge circuit and the second ventilation rate of the supplemental circuit comprises:
adjusting a first ventilation rate of the charging loop by adjusting a flow rate of a first constant flow pump;
the second ventilation rate of the make-up circuit is adjusted by adjusting the flow rate of a second constant flow pump.
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