CN208520717U - The measuring device of boric acid concentration in a kind of boron recovery system - Google Patents
The measuring device of boric acid concentration in a kind of boron recovery system Download PDFInfo
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- CN208520717U CN208520717U CN201821333920.5U CN201821333920U CN208520717U CN 208520717 U CN208520717 U CN 208520717U CN 201821333920 U CN201821333920 U CN 201821333920U CN 208520717 U CN208520717 U CN 208520717U
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- boric acid
- fluidized bed
- bed furnace
- recovery system
- tuning fork
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Abstract
The utility model discloses a kind of measuring devices of boric acid concentration in boron recovery system, including a boric acid fluidized bed furnace, circulating pump and heater, connecting pipe is passed sequentially through between the boric acid fluidized bed furnace, circulating pump and heater constitutes circulation loop, it is inserted in connecting pipe between boric acid fluidized bed furnace and circulating pump and exports for detecting boric acid fluidized bed furnace to the tuning fork densitometer of the borate concentration of circulating pump, the tuning fork densitometer is in the bottom most position of boric acid fluidized bed furnace.The structure that the utility model realization entirely measures is simple and convenient to operate, is at low cost, measurement accuracy is high, and can satisfy measurement request.
Description
Technical field
The technical field that the utility model relates to measure in boron recovery system boric acid concentration, more specifically, it relates to
The measuring device of boric acid concentration in a kind of boron recovery system.
Background technique
Boron recovery system is the auxiliary system of PWR nuclear power plant.For storing, handling, monitor and recycling primary Ioops row
Water, to reduce radioactive wastewater to the discharge of environment and the recycling of boron.Boron recovery system is related to boric acid in pressurized-water reactor nuclear power plant
The functions such as concentration and recovery, distillation condensation demineralized water recycling, the purpose is to boric acid, that salt water is distilled off is can be recycled.It is returned in boron
It when receipts system is run, needs to monitor boric acid concentration, by the boric acid concentration value of monitoring concentration, controls the fortune of boron recovery system device
Row, PWR of Nuclear Power Station boron recovery system at present, the heap-type of boron need to be adjusted by being mainly used in presurized water reactor, as CPR heap-type, VVR heap-type,
EPR heap-type etc.；And boron recovery system controls evaporation and row's boron control mainly around boric acid concentration amount, therefore boric acid concentration value is
Key parameter in boron recovery system, therefore need to study feasible measurement scheme.There are two types of currently existing schemes, is fluidized bed furnace respectively
Tuning-fork test and pipe vibration density tube method.
1, fluidized bed furnace tuning-fork test
According to boron equilibrium principle, by flow control estimated concentration, boron recovery system evaporation element is that sequence controls (sequence
It is divided into multiple states, each state realizes specific function), discharge concentration liquid status and evaporative distillation concentration are in vapo(u)rization system
When state, entire automatic control is adjusted, all the fixed liquid level of maintenance vaporising device, and calculates boric acid concentration value by boron equilibrium equation.
But boric acid equilibrium equation needs core sampling system to support, need to be sampled by core and obtain initial boric acid concentration, and verified dense
Boric acid concentration after contracting.
When maintaining vaporising device to fix liquid level, there are following balances.
When evaporative distillation is concentrated, there are following boric acid equilibrium equations:
Vt× Δ C=V × C0
(1) in formula: Vt: it is concentrated by evaporation circuit total capacity；Δ C: boric acid concentration incrementss；V: initial concentration boric acid to be measured into
Doses；C0: initial boric acid concentration (can be obtained by core sampling system) to be concentrated
When concentrate is discharged, there are following boric acid equilibrium equations:
W × C=W × C0+Vt×ΔC
(2) in formula: W: concentrate discharge rate；Vt: it is concentrated by evaporation circuit total capacity；Δ C: boric acid concentration incrementss；V: just
Begin concentration boric acid inlet amount to be measured；C0: initial boric acid concentration (can be obtained by core sampling system) to be concentrated；C concentrate is average
Concentration is discharged
By boric acid equilibrium equation, feed rate, evaporative condenser flow quantity and discharge concentration boron flow are controlled
It completes boron and is concentrated by evaporation control.
2, pipe vibration density tube method
Pipe vibration density tube method be by vibrate density pipe be inserted into pipeline then also with boric acid concentration with it is close
The relationship of degree, measures boric acid concentration.The principle of pipe vibration density tube method is that liquid flows through fixed volume in vibrating tube
Fluid density variation, can change the vibration frequency of vibrating tube, measure fluid density by monitoring frequency signal.
Measurement circuit need to be additionally set when measuring boric acid using pipe vibration density tube method mostly at present, but measuring.Cause
Additional setting measurement circuit and instrument itself price etc., entire measurement scheme price are higher.
And boron recovery system of nuclear power plant boric acid measurement, it need to generally meet following condition:
1) it must assure that high-precision requirement is realized in detection
Since boron recovery system is automated control technology, and the parameter of boric acid concentration content measurement, it is boron recycling system
The key parameter of system automatic control, so must assure that high-precision, highly reliable measurement in measurement process, and this is also automation control
The premise of system.
2) need to guarantee the reliability of antidetonation in the detection process
Since measured medium is radioactive liquid, entire measurement process can have high-efficient anti-vibration effect, not occur
Cut prevents radioactive liquid from leaking, and improves safety.
3) guarantee that the price of measurement should not be excessively high
Under the premise of meeting nuclear power requirement, the advantage of lower cost of entire detection process is needed.
But the measurement scheme of current fluidized bed furnace tuning-fork test and pipe vibration density tube method cannot preferably meet
Three conditions above, it is therefore desirable to which its measurement scheme is improved.
Utility model content
In view of the deficienciess of the prior art, the purpose of this utility model is to provide boric acid in a kind of boron recovery system is dense
The measuring device of degree, structure is simple and convenient to operate, is at low cost, measurement accuracy is high, and can satisfy measurement request.
To achieve the above object, the utility model provides following technical solution:
The measuring device of boric acid concentration in a kind of boron recovery system, including a boric acid fluidized bed furnace, circulating pump and heater,
Connecting pipe is passed sequentially through between the boric acid fluidized bed furnace, circulating pump and heater and constitutes circulation loop, in boric acid fluidized bed furnace
It is inserted in connecting pipe between circulating pump and exports for detecting boric acid fluidized bed furnace to the tuning fork of the borate concentration of circulating pump
Densitometer, the tuning fork densitometer are in the bottom most position of boric acid fluidized bed furnace, be remotely connected on the tuning fork densitometer with
The flow transmitter of DCS connection.
Further, in order to improve measurement accuracy, measuring point is selected in the pipeline section of no boiling, two streams is eliminated, in tuning fork density
Display is electrically connected with by low-smoke halogen-free inflaming-retarding cable line on meter.
Further, it reveals in order to prevent, the tuning fork densitometer is by flanged joint in boric acid boiling furnace bottom and circulation
In the connecting pipe of pump.
Further, in order to keep data transmission more convenient, wireless blue tooth device is connected on the tuning fork densitometer.
Further, in order to keep data transmission more convenient, USB data interface is connected on the tuning fork densitometer.
By using above-mentioned technical proposal, when work, the cryogenic liquid using bottom in boric acid fluidized bed furnace can pass through circulation
Pumping, which takes, to be then fed into heater and is heated, and the liquid heated flows back to boric acid fluidized bed furnace, circulation so in cycles, from
And the process that the liquid in boric acid fluidized bed furnace is boiled, and this structure utilizes the measuring point of tuning fork densitometer being selected in boric acid
On pipeline loop, in this way since the fluid temperature extracted from boric acid fluidized bed furnace bottommost relatively will not be too high, to the point
Liquid carry out boric acid measurement when, will not because of boric acid boil two influence measurement structures, can eliminate in this way boric acid boiling
The boiling of furnace influences, while directly tuning fork densitometer being inserted into pipeline, finally eliminates measurement pipeline, reduces radioactive liquid
Risk of leakage, cost can also be reduced, at the same allow in the detection process medium stablize, jump signal can be eliminated, simultaneously because
Tuning fork densitometer is primarily present boundary effect, need to generally be inserted into bulk container, eliminates boundary effect, as long as therefore will pipe in design
Road caliber is designed to sufficiently large, and the problem of by choosing reasonable model, can avoid boundary effect, this structure is utilized in summary
The measuring point of tuning fork densitometer is selected on boric acid pipeline loop, is then measured according to formula and obtains boric acid concentration, realized with this whole
The structure of a measurement is simple and convenient to operate, is at low cost, measurement accuracy is high, and can satisfy measurement request.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the measuring device of boric acid concentration in boron recovery system in embodiment 1；
Fig. 2 is a kind of structural schematic diagram of the measuring device of boric acid concentration in boron recovery system in embodiment 2；
Fig. 3 is a kind of structural schematic diagram of the measuring device of boric acid concentration in boron recovery system in embodiment 3.
In figure: 1. boric acid fluidized bed furnaces；2. circulating pump；3. heater；4. circulation loop；5. connecting pipe；6. tuning fork density
Meter；7. flow transmitter；8. display；9. wireless blue tooth device；10.USB data-interface；11.DCS.
Specific embodiment
The present embodiment is described in further detail below in conjunction with attached drawing 1- attached drawing 3.
Embodiment 1:
As shown in Figure 1, in a kind of boron recovery system boric acid concentration measuring device, including a boric acid fluidized bed furnace 1, circulation
Pump 2 and heater 3 pass sequentially through connecting pipe 5 and constitute circulation between the boric acid fluidized bed furnace 1, circulating pump 2 and heater 3
Circuit 4 is inserted in the connecting pipe 5 between boric acid fluidized bed furnace 1 and circulating pump 2 for detecting the output of boric acid fluidized bed furnace 1 to following
The tuning fork densitometer 6 of the borate concentration of ring pump 2, the tuning fork densitometer 6 are in the bottom most position of boric acid fluidized bed furnace 1, institute
The flow transmitter 7 for being remotely connected on tuning fork densitometer 6 and connecting with DCS11 is stated, in order to improve measurement accuracy, measuring point is selected in nothing
The pipeline section of boiling eliminates two streams, is electrically connected with display 8 by low-smoke halogen-free inflaming-retarding cable line on tuning fork densitometer 6.
Further, it reveals in order to prevent, company of the tuning fork densitometer 6 by flanged joint in boric acid fluidized bed furnace 1 bottom and circulating pump 2
On adapter tube road 5.After obtaining data, then the analog signal teletransmission of 4-20mA is sent to using 7 teletransmission of flow transmitter
DCS11 is monitored.Wherein the DCS11 is english abbreviation (the Distributed Control of dcs
System), automatic control industry is also referred to as Distributed Control System at home.It is a kind of new for centralized control system
Type computer control system.
It is specifically realized using following steps in above structure:
Step 1: the measuring point for measuring boric acid concentration is selected on the circulation loop 4 of boric acid pipeline；It is in boric acid fluidized bed furnace
In connecting pipe 5 between 1 and circulating pump 2；
Step 2: tuning fork densitometer 6 can be allowed to be inserted into the selection of connecting pipe 5 between boric acid fluidized bed furnace 1 and circulating pump 2
Pipe diameter；
Step 3: boric acid concentration is bigger, and the higher relationship of density is close to measure boric acid then according at that same temperature
Degree, can be obtained boric acid concentration；Wherein 6 vibration frequency of tuning fork densitometer and density are indicated with following formula:
ρ=K0+K1T+K2T2 (1)
In above-mentioned formula: ρ-fluid density；K0、K1、K2Liquid densimeter coefficient, is determined by laboratory or producer；T- vibration
The dynamic period.
Further, detection efficiency is improved, the material of the connecting pipe 5 is ss material.
Further, safety is improved, increases the inspection Step 4: to being electrically connected in entire measuring device before step 1
Look into the step of being tested；To the measuring process of 5 size Control of connecting pipe；Pipeline and 6 cleannes of tuning fork densitometer are examined
The step of looking into, to the Insulation Test of tuning fork densitometer 6, heat insulation test, load test, the test of no to scale range, supply voltage
Influence test, testing response time and extreme temperature the step of influencing test.
When work, using bottom in boric acid fluidized bed furnace cryogenic liquid can by circulating pump extract be then fed into heater into
Row heating, the liquid heated flow back to boric acid fluidized bed furnace, circulation so in cycles, so that the liquid in boric acid fluidized bed furnace
The process that body boils, and this structure is using the measuring point of tuning fork densitometer to be selected on boric acid pipeline loop, in this way due to from
The fluid temperature that boric acid fluidized bed furnace bottommost extracts is opposite will not be too high, therefore when the liquid to the point carries out boric acid measurement,
Will not boil two influence measurement structures because of boric acid, and the boiling that can eliminate boric acid fluidized bed furnace in this way influences, while directly
Tuning fork densitometer is inserted into pipeline, measurement pipeline is finally eliminated, reduces the risk of leakage of radioactive liquid, can also reduce
Cost, while medium being allowed to be stablized in the detection process, jump signal can be eliminated, simultaneously because tuning fork densitometer is primarily present boundary
Effect, need to generally be inserted into bulk container, eliminate boundary effect, as long as therefore pipe diameter is designed in design sufficiently large, lead to
The problem of crossing and choose reasonable model, can avoid boundary effect, this structure, which utilizes, in summary selects the measuring point of tuning fork densitometer
It on boric acid pipeline loop, is then measured according to formula and obtains boric acid concentration, realized that the structure entirely measured is simple with this, operate
It is convenient, at low cost, measurement accuracy is high, and can satisfy measurement request.
The method of precision is provided in this structure, the bottommost of fluidized bed furnace is mainly chosen at, because measuring point is in bottom, pressure
Height will not generate two phase flow, and measuring point is stablized, and compared to for fluidized bed furnace insertion, because of the stabilization of medium, measurement accuracy is higher.
Boron table is made using tuning fork densitometer, because tuning fork densitometer structure is simple, there is an advantage in that:
1) measuring point condition
In container lowermost end, it is not in two phase flow that pressure is high.
The liquid of tuning fork is flowed through, density or concentration are different, and tuning fork vibration frequency is different.According to certain nuclear power supply of material product money
Material, is compared with certain three generations's nuclear power station parameter: table 1 is the measuring point condition of the utility model
2) antidetonation
Because tuning fork densitometer structure is simple, as long as guaranteeing that flange installation meets respective standard, that is, it can guarantee under earthquake, do not send out
Raw leakage, reaches the requirement of antidetonation.And by establishing model of vibration, checked using algorithm.
3) it irradiates
Tuning fork densitometer generally works under radioactive environment, and primary electron component etc. is influenced by irradiation.It adopts at present
With partial installation, by the sensitive components and probe separation on tuning fork densitometer, far from irradiation bomb.
Embodiment 2:
As shown in Fig. 2, in a kind of boron recovery system boric acid concentration measuring device, further, in order to make data transmission more
Add conveniently, be connected with wireless blue tooth device 9 on the tuning fork densitometer 6, designed using this structure, wireless blue tooth device 9 can be utilized,
The data that will test are sent to controller by way of bluetooth.
Embodiment 3:
As shown in figure 3, in a kind of boron recovery system boric acid concentration measuring device, further, in order to make data transmission more
Add conveniently, be connected with USB data interface 10 on the tuning fork densitometer 6, is designed, can be connect using usb data using this structure
Mouth 10, the data that will test are by being exported.
This specific embodiment is only the explanation to the present embodiment, is not the limitation to the present embodiment, this field skill
Art personnel can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as
All by the protection of Patent Law in the scope of the claims of the present embodiment.
Claims (7)
1. the measuring device of boric acid concentration in a kind of boron recovery system, including a boric acid fluidized bed furnace (1), circulating pump (2) and add
Hot device (3), it is characterised in that: pass sequentially through connecting tube between the boric acid fluidized bed furnace (1), circulating pump (2) and heater (3)
Road (5) constitutes circulation loop (4), is inserted in the connecting pipe (5) between boric acid fluidized bed furnace (1) and circulating pump (2) for examining
Boric acid fluidized bed furnace (1) output is surveyed to the tuning fork densitometer (6) of the borate concentration of circulating pump (2), at the tuning fork densitometer (6)
Bottom most position in boric acid fluidized bed furnace (1) is remotely connected with the flow connecting with DCS (11) on the tuning fork densitometer (6)
Transmitter (7).
2. the measuring device of boric acid concentration in a kind of boron recovery system according to claim 1, it is characterised in that: in tuning fork
Display (8) are electrically connected with by low-smoke halogen-free inflaming-retarding cable line on densitometer (6).
3. the measuring device of boric acid concentration in a kind of boron recovery system according to claim 1 or 2, it is characterised in that: institute
It states tuning fork densitometer (6) and passes through flanged joint in the connecting pipe (5) of boric acid fluidized bed furnace (1) bottom and circulating pump (2).
4. the measuring device of boric acid concentration in a kind of boron recovery system according to claim 1, it is characterised in that: the sound
Wireless blue tooth device (9) are connected on fork densitometer (6).
5. the measuring device of boric acid concentration in a kind of boron recovery system according to claim 1 or 2, it is characterised in that: institute
It states and is connected with USB data interface (10) on tuning fork densitometer (6).
6. the measuring device of boric acid concentration in a kind of boron recovery system according to claim 3, it is characterised in that: the sound
USB data interface (10) are connected on fork densitometer (6).
7. the measuring device of boric acid concentration in a kind of boron recovery system according to claim 4, it is characterised in that: the sound
USB data interface (10) are connected on fork densitometer (6).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108760572A (en) * | 2018-08-19 | 2018-11-06 | 戴红梅 | The measuring device and its method of boric acid concentration in a kind of boron recovery system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108760572A (en) * | 2018-08-19 | 2018-11-06 | 戴红梅 | The measuring device and its method of boric acid concentration in a kind of boron recovery system |
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