CN112687418A - Automatic metering neutralization device and method - Google Patents
Automatic metering neutralization device and method Download PDFInfo
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- CN112687418A CN112687418A CN201910988065.4A CN201910988065A CN112687418A CN 112687418 A CN112687418 A CN 112687418A CN 201910988065 A CN201910988065 A CN 201910988065A CN 112687418 A CN112687418 A CN 112687418A
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Abstract
The invention belongs to the field of treatment of radioactive three wastes of nuclear power stations, and particularly relates to an automatic metering neutralization device and method. The waste bag treated by the evaporation drying technology contains strong corrosive substances, and does not meet the requirements of harmless treatment and disposal of radioactive waste and permanent safety. The invention comprises an automatic metering unit and an automatic neutralizing unit, so that the radioactive concentrated waste liquid firstly enters a metering neutralizing tank for metering before being dried in a barrel, then a dosing controller is automatically measured according to a metering result and PH, the amount of the added medicament is calculated, the type of the medicament required for neutralization is controlled, stirring is carried out by a stirring paddle, the radioactive concentrated waste liquid in the metering neutralizing tank is effectively neutralized, and then drying treatment is carried out. The invention realizes automatic control and remote monitoring of radioactive region operation, ensures that the treated radioactive waste bag does not contain strong corrosive substances, and meets the requirements of waste bag treatment and national standards.
Description
Technical Field
The invention belongs to the field of treatment of radioactive three wastes of nuclear power stations, and particularly relates to an automatic metering neutralization device and method.
Background
The nuclear facility inevitably generates a large amount of radioactive waste liquid in the normal operation process, the waste liquid is collected, stored, decayed, ion exchanged, filtered and the like, the treated waste liquid is discharged after being monitored to be qualified, the unqualified waste liquid is evaporated, but concentrated sludge (generally called as radioactive concentrated waste liquid) generated after the evaporation treatment is solidified into solidified body as a solid waste by adopting a cement solidification treatment process because a large amount of radioactive substances are concentrated, but the traditional cement solidification process is simple in process but large in capacity increase, in order to realize the minimization of the radioactive waste, the radioactive concentrated waste liquid generated by the nuclear facility is evaporated by adopting an evaporation drying technology in recent years, the radioactive concentrated waste liquid generated in the waste liquid evaporation treatment process is collected in a concentrated waste liquid receiving tank, then directly carry the radioactive concentration waste liquid to the metal barrel of the dryer in the barrel through the concentrated waste liquid transfer pump, carry out evaporation to dryness treatment by heating the metal barrel, the concentrated waste liquid in the barrel is evaporated to dryness to become solid matter, can carry out super compaction on the barrel after the evaporation to dryness, then pack the barrel cake into the metal barrel and carry out fixed temporary storage treatment, also can directly pack it into high integrality concrete container and send to final disposal site after fixing and handle.
Such a treatment process has the following problems:
as the radioactive concentrated waste liquid generated by the nuclear facility contains NaOH, boric acid and other components, the waste bag treated by the treatment process contains strong corrosive substances, which can not meet the requirements of harmless treatment and disposal of radioactive waste and guarantee permanent safety;
the waste bag treated by the treatment process contains strong corrosive substances, and the requirement that the waste bag does not contain the strong corrosive substances in the national standard GB9132-2018 safety regulations on near-surface treatment of low-level and medium-level radioactive solid wastes is not met;
in order to solve the problems, a device is needed to be designed, so that a waste bag generated after radioactive concentrated waste liquid is evaporated and dried does not contain strong corrosive substances, and the treatment requirement of radioactive waste is met.
Disclosure of Invention
The purpose is as follows:
according to the invention, by designing the automatic metering neutralization device and method, the radioactive concentrated waste liquid generated by the nuclear facility is firstly metered, and is subjected to neutralization reaction by utilizing the principle of acid and alkali neutralization according to the metering result, wherein the acid and alkali amounts required for neutralization are automatically measured according to the pH value and are automatically calculated, the acid and alkali injection amounts are controlled by feeding back a chain signal, and then the neutralized radioactive concentrated waste liquid is sent into the drying device in the barrel for evaporation and drying treatment, so that the radioactive waste bag is ensured not to contain strong corrosive substances, the final treatment requirement of the waste bag is met, the reduction, harmless treatment and treatment of the radioactive waste are realized, and the target requirement of permanent safety is ensured.
The technical scheme is as follows:
an automatic metering neutralization device comprises an automatic metering unit and an automatic neutralization unit. The automatic metering unit comprises an inlet valve of a metering neutralization tank, an outlet valve of the metering neutralization tank, a stirring paddle, a stirring motor, an exhaust filter of the metering neutralization tank, an exhaust valve, a liquid level meter and a pressure meter; the inlet valve of the metering neutralization tank is connected with the metering neutralization tank in a flange mode through a pipeline, the bottom of the metering neutralization tank is connected with the outlet valve of the metering neutralization tank through a pipeline, and the outlet valve of the metering neutralization tank is connected with the inlet valve of the dryer in the barrel through a pipeline; the top of the metering neutralization tank is connected with a metering neutralization tank exhaust filter in a flange mode through a pipeline, the metering neutralization tank exhaust filter is connected with an exhaust valve through a pipeline, the exhaust valve is connected with a factory equipment exhaust system through a pipeline, the top of the metering neutralization tank is connected with a liquid level meter and a pressure gauge in a flange mode through a pipeline, and a stirring motor is installed at the top of the metering neutralization tank and is connected with a stirring paddle through a torsion bar.
The automatic neutralization unit comprises an acid liquor storage tank, an alkali liquor storage tank, a dosing pump, an acid liquor storage tank outlet valve, an alkali liquor storage tank outlet valve, a dosing pump inlet valve, a dosing pump outlet valve, an online PH measuring meter, a flange, a PH automatic measuring and dosing controller, a remote control console and a flowmeter; the top of the metering neutralization tank is connected with a dosing pump outlet valve in a flange mode through a pipeline, a flow meter is installed on an intermediate pipeline, the dosing pump outlet valve is connected with a dosing pump through a pipeline, the dosing pump is connected with a dosing pump inlet valve through a pipeline, the dosing pump inlet valve is respectively connected with an acid liquor storage tank outlet valve and an alkali liquor storage tank outlet valve through pipelines, and the acid liquor storage tank outlet valve extends into the bottom of the acid liquor storage tank through a pipeline. Alkali lye holding vessel outlet valve passes through the pipeline and stretches into alkali lye holding vessel bottom, and online PH meter passes through the flange form and installs in the measurement and inslot portion to through measuring line connection to PH automatic measure add medicine controller, wherein acidizing fluid holding vessel outlet valve, alkali lye holding vessel outlet valve, add medicine pump inlet valve, add medicine pump outlet valve, add the medicine pump, the flowmeter, the appearance accuse signal of level gauge passes through the cable and is connected with PH automatic measure adds medicine controller, PH automatic measure adds medicine controller and passes through the cable conductor and be connected with the remote control operation panel.
An automatic metering neutralization method comprises the following steps: conveying the radioactive concentrated waste liquid to a metering neutralization tank; step two: neutralizing the radioactive concentrated waste liquid; step three: evaporating and drying the radioactive concentrated waste liquid.
The method comprises the following steps: the radioactive concentrated waste liquid is conveyed to a metering neutralization tank, and the method comprises the following steps:
after the radioactive waste liquid is subjected to evaporation treatment by an evaporator of a radioactive waste liquid treatment system, the generated concentrated waste liquid is conveyed into a concentrated waste liquid receiving tank through a concentrated waste pump for storage, and after temporary storage and decay, an outlet valve of the concentrated waste liquid receiving tank, an inlet valve of a concentrated waste liquid conveying pump, an inlet valve of a metering neutralization tank and an exhaust valve are opened;
(II) starting a concentrated waste liquid conveying pump, conveying the radioactive concentrated waste liquid to a metering neutralization tank, and automatically stopping the concentrated waste liquid conveying pump to meter an inlet valve of the neutralization tank through interlocking control when the effective volume of the liquid level meter neutralization tank is 70%; and (4) closing an outlet valve of the concentrated waste liquid receiving tank and conveying the radioactive concentrated waste liquid through an inlet valve of a concentrated waste liquid conveying pump.
Step two: the method for neutralizing the radioactive concentrated waste liquid comprises the following steps:
starting a PH automatic measuring and dosing controller, measuring the PH value of the radioactive concentrated waste liquid in the measuring and neutralizing tank by an online PH measuring meter, and obtaining the volume of the radioactive concentrated waste liquid in the measuring and neutralizing tank by a liquid level meter;
secondly, starting a stirring paddle motor to enable the stirring paddle to be in a working state;
(III) the PH automatic measuring and dosing controller judges the medicament to be neutralized according to the PH value and the volume of the radioactive concentrated waste liquid, calculates the amount of the medicament to be added, and executes the neutralizing and dosing operation through a remote control command;
if the system judges that the medicament to be added is an acidic solution, the system opens an outlet valve of an acid liquor storage tank, an inlet valve of a dosing pump and an outlet valve of the dosing pump, then starts the dosing pump, stops the dosing pump when the flow meter measures that a set amount is reached, and closes the outlet valve, the inlet valve of the dosing pump and the outlet valve of the dosing pump;
if the system judges that the medicament to be added is alkaline solution, the system opens an outlet valve of the acid liquor storage tank, an inlet valve of the dosing pump and an outlet valve of the dosing pump, then starts the dosing pump, stops the dosing pump when the flow meter measures that the set quantity is reached or the measured value of the liquid level meter reaches 90% of the effective volume of the metering neutralization tank, and closes the outlet valve of the acid liquor storage tank, the inlet valve of the dosing pump and the outlet valve of the dosing pump;
adding the medicament into a metering neutralization tank, carrying out neutralization reaction in the tank, remotely checking an online PH meter after the neutralization reaction is finished for a period of time to obtain a measured value, and finishing the neutralization reaction if the measured value reaches 6.5-7.5;
(seventh) if the measured value of the online PH meter is less than 6.5 or more than 7.5, the system executes according to the steps 3 and 4;
(VIII) closing the PH automatic measuring and dosing controller.
Step three: the evaporation and drying of the radioactive concentrated waste liquid comprises the following steps:
placing a waste barrel in an in-barrel dryer through a roller way;
opening an outlet valve of the metering neutralization tank and an inlet valve of the dryer in the barrel, discharging waste liquid in the metering neutralization tank into the dryer in the barrel, and closing the outlet valve of the metering neutralization tank and the inlet valve of the dryer in the barrel by interlocking after the liquid level of the dryer in the barrel reaches 80%;
opening an inlet valve of a condenser, starting a dryer in the barrel for evaporation drying, allowing steam to enter the condenser for condensation through a steam-water separation filter, starting a condensate discharging pump to discharge to a special water discharge and collection system of a factory building by opening an inlet valve of the condensate discharging pump and an outlet valve of the condensate discharging pump after condensate generated by condensation reaches a certain liquid level height, closing the condensate discharging pump after discharging, and closing the inlet valve of the condensate discharging pump and the outlet valve of the condensate discharging pump;
fourthly, when the liquid level of the condenser does not rise any more within a certain time, indicating that the evaporation of the waste liquid of the dryer in the barrel reaches the requirement, opening an outlet valve of the metering neutralization tank and an inlet valve of the dryer in the barrel, discharging the waste liquid in the metering neutralization tank into the dryer in the barrel, closing the outlet valve of the metering neutralization tank and the inlet valve of the dryer in the barrel after the liquid level of the dryer in the barrel reaches a certain height through linkage, and circularly performing until the weight of the drying device in the barrel reaches a certain quantity or the liquid level of the solid in the barrel reaches a certain height, stopping the heating device, thereby completing the evaporation and drying operation of a single barrel;
fifthly, repeating the steps until all the radioactive concentrated waste liquid in the metering neutralization tank is evaporated and dried;
and (VI) performing subsequent treatment on the evaporated and dried waste barrel according to the process flow.
Has the advantages that:
a) the automatic metering neutralization device and the method are characterized in that an automatic metering unit is designed to neutralize corresponding agents added into a metering neutralization tank, so that the treated waste bag does not contain strong corrosive substances, the final disposal requirement of the waste bag is met, the target requirements of radioactive waste, harmless treatment, disposal and permanent safety guarantee are met, and the automatic metering neutralization device and the method have important reference values for radioactive waste treatment system design and waste treatment thinking.
b) The automatic metering neutralization device and the method are characterized in that an automatic neutralization unit is designed to automatically measure the PH value of the radioactive concentrated waste liquid in the metering neutralization tank, the amount of added medicament is automatically calculated through calculation and control of a PH automatic measuring and dosing controller, the type of the medicament required for neutralization is automatically controlled, automatic control and remote monitoring of radioactive area operation are realized, and the safety of the system is improved.
c) The automatic metering neutralization device and the method are characterized in that the metering neutralization tank is internally provided with the stirring paddle, and the top of the metering neutralization tank is provided with the stirring motor, so that the effectiveness of neutralization is fully ensured, and the reliability of a system is improved.
d) The automatic metering neutralization device and the method are characterized in that the top of the metering neutralization tank is provided with the exhaust filter of the metering neutralization tank, so that the exhaust meets the emission requirement, and the safety of the system is improved.
e) The automatic metering neutralization device and the method are characterized in that an online PH meter is arranged in a metering neutralization tank in a flange mode, is connected to a PH automatic measuring and dosing controller through a measuring line to realize automatic measurement and feedback of a PH value, a PLC is adopted for controlling an automatic neutralization unit, a valve and a dosing pump of the automatic neutralization unit are controlled in a linkage mode, and the safety of the system is improved.
The invention determines to select 30-60% dilute sulphuric acid as NaOH neutralizing agent by optimizing selection and comparison, thereby not only ensuring the safety of the system, but also solving the problem of treating the waste liquid containing NaOH in the radioactive concentrated waste liquid.
Drawings
FIG. 1 is a flow chart of "an automatic metering neutralization apparatus and method" in the present invention.
In the figure: 1. a concentrated waste liquid receiving tank; 2. an outlet valve of the concentrated waste liquid receiving tank; 3. a concentrated spent liquor transfer pump inlet valve; 4. a concentrated waste liquid delivery pump; 5. an in-drum dryer inlet valve; 6. an in-barrel dryer; 7. a steam-water separation filter; 8. a condenser inlet valve; 9. a condenser; 10. a condensate drain pump inlet valve; 11. a condensate drain pump; 12. a condensate drain pump outlet valve; 13. an acid liquor storage tank; 14. an outlet valve of the acid liquor storage tank; 15. an alkali liquor storage tank; 16. an outlet valve of the alkali liquor storage tank; 17. a dosing pump inlet valve; 18. a dosing pump; 19. a dosing pump outlet valve; 20. a metering neutralization tank inlet valve; 21. a metering neutralization tank; 22. a metering neutralization tank outlet valve; 23. a stirring paddle; 24. a stirring paddle motor; 25. a dosing neutralization tank vent filter; 26. an exhaust valve; 27: a liquid level meter; 28. a pressure gauge; 29. an online pH meter; 30. a flange; a PH automatic measuring and dosing controller; 32. a remote control console; 33. a flow meter.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The invention designs an automatic metering neutralization device and method, mainly comprising an automatic metering unit and an automatic neutralization unit. Is mainly characterized in that an automatic metering unit and an automatic neutralizing unit are arranged between a concentrated waste liquid receiving tank and a dryer in a barrel, the radioactive concentrated waste liquid firstly enters a metering neutralization tank for metering before being dried in a barrel, then according to the calculation and control of the metering result and the PH automatic measuring medicine-adding controller, the amount of the added medicine is automatically calculated, the type of the medicine to be neutralized is automatically controlled, stirring with stirring paddle, metering the radioactive concentrated waste liquid in the neutralizing tank for effective neutralization to keep the radioactive concentrated waste liquid neutral and free of corrosive substances, and finally sending the radioactive concentrated waste liquid into a drying device in a barrel for evaporation drying treatment, thereby realizing automatic control and remote monitoring of radioactive region operation, and the treated radioactive waste bag is ensured not to contain strong corrosive substances, and the requirements of waste bag disposal and national standards are met.
The automatic metering unit comprises a metering neutralization tank inlet valve 20, a metering neutralization tank 21, a metering neutralization tank outlet valve 22, a stirring paddle 23, a stirring paddle motor 24, a metering neutralization tank exhaust filter 25, an exhaust valve 26, a liquid level meter 27, a pressure gauge 28 and pipelines thereof. The outlet of the concentrated waste liquid conveying pump is connected with an inlet valve 20 of a metering neutralization tank through a pipeline, the inlet valve 20 of the metering neutralization tank is connected with a metering neutralization tank 21 through a pipeline in a flange mode, the bottom of the metering neutralization tank 21 is connected with an outlet valve 22 of the metering neutralization tank through a pipeline, and the outlet valve 22 of the metering neutralization tank is connected with an inlet valve 5 of an in-barrel dryer through a pipeline; the top of the metering neutralization tank 21 is connected with a metering neutralization tank exhaust filter 25 in a flange mode through a pipeline, the metering neutralization tank exhaust filter 25 is connected with an exhaust valve 26 through a pipeline, the exhaust valve 26 is connected with a factory building equipment exhaust system through a pipeline, the top of the metering neutralization tank 21 is connected with a liquid level meter 27 and a pressure gauge 28 in a flange mode through pipelines, and a stirring paddle motor 24 is installed at the top of the metering neutralization tank 21 and is connected with a stirring paddle 23 through a torsion bar.
The in-barrel dryer inlet valve 5 is connected with the in-barrel dryer 6 through a pipeline and a telescopic pipe, the in-barrel dryer 6 is connected with a steam-water separation filter 7 through a pipeline and a telescopic pipe, the steam-water separation filter 7 is connected with a condenser inlet valve 8 through a pipeline, the condenser inlet valve 8 is connected with a condenser 9 through a pipeline, the condenser 9 is connected with a condensate discharge pump inlet valve 10 through a pipeline, the condensate discharge pump inlet valve 10 is connected with a condensate discharge pump 11 through a pipeline, and the condensate discharge pump 11 is connected with a condensate discharge pump outlet valve 12 through a pipeline.
The automatic neutralization unit comprises an acid liquor storage tank 13, an alkali liquor storage tank 15, a dosing pump 18, an acid liquor storage tank outlet valve 14, an alkali liquor storage tank outlet valve 16, a dosing pump inlet valve 17, a dosing pump outlet valve 19, an online PH meter 29, a flange 30, a PH automatic measuring and dosing controller 31, a remote control console 32, a flow meter 33, pipelines and cables thereof. The top of the metering neutralization tank 21 is connected with a dosing pump outlet valve 19 in a flange mode through a pipeline, a flowmeter 33 is installed on an intermediate pipeline, the dosing pump outlet valve 19 is connected with a dosing pump 18 through a pipeline, the dosing pump 18 is connected with a dosing pump inlet valve 17 through a pipeline, the dosing pump inlet valve 17 is respectively connected with an acid liquor storage tank outlet valve 14 and an alkali liquor storage tank outlet valve 16 through pipelines, the acid liquor storage tank outlet valve 14 extends into the bottom of the acid liquor storage tank 13 through a pipeline, the alkali liquor storage tank outlet valve 16 extends into the bottom of the alkali liquor storage tank 15 through a pipeline, an online PH meter 29 is installed inside the metering neutralization tank 21 in a flange mode and is connected with an automatic PH measuring and dosing controller 31 through a measuring line, wherein the acid liquor storage tank outlet valve 14, the alkali liquor storage tank outlet valve 16, the dosing pump inlet valve 17, the dosing pump outlet valve 19, the dosing pump 18, the flowmeter 33, The instrument control signal of the liquid level meter 27 is connected with the PH automatic measurement dosing controller 31 through a cable, and the PH automatic measurement dosing controller 31 is connected with the remote control operation console through a cable.
The valve of the system adopts an electromagnetic valve, and adopts PLC to carry out automatic control, and the PLC controls the electromagnetic valve in the system by adopting Siemens S7.0 version to carry out programming control, so as to realize the automatic operation and control of the system.
As shown in the figure, the automatic metering neutralization device and method provided by the invention have the following working processes:
firstly, setting all valves in the system to be in a closed state (initial state);
the method comprises the following steps: delivering the radioactive concentrated waste liquid to a metering neutralization tank
1. Concentrated waste liquid generated after the radioactive waste liquid is subjected to evaporation treatment by an evaporator of the radioactive waste liquid treatment system is conveyed into a concentrated waste liquid receiving tank 1 through a concentrated waste pump for storage, and after temporary storage and decay, an outlet valve 2 of the concentrated waste liquid receiving tank, an inlet valve 3 of the concentrated waste liquid conveying pump, an inlet valve 20 of a metering neutralization tank and an exhaust valve 26 are opened;
2. starting the concentrated waste liquid conveying pump 4, conveying the radioactive concentrated waste liquid into the metering neutralization tank 21, stopping the concentrated waste liquid conveying pump 4 through interlocking control when the measured value of the liquid level meter 27 reaches 70% of the effective volume of the metering neutralization tank, and closing an inlet valve 20 of the metering neutralization tank;
3. and closing the outlet valve 2 of the valve concentrated waste liquid receiving tank and the inlet valve 3 of the concentrated waste liquid conveying pump to finish the conveying of the radioactive concentrated waste liquid.
Step two: neutralization of radioactive concentrated waste liquid
Starting a PH automatic measuring and dosing controller 31, measuring the PH value of the radioactive concentrated waste liquid in the measuring and neutralizing tank 21 by an online PH meter 29, and obtaining the volume of the radioactive concentrated waste liquid in the measuring and neutralizing tank 21 by a liquid level meter 27;
starting a stirring paddle motor 24 to enable the stirring paddle to be in a working state;
the PH automatic measurement dosing controller 31 judges the medicament to be neutralized according to the PH value and the volume of the radioactive concentrated waste liquid, calculates the amount of the medicament to be added, and executes the neutralization dosing operation through a remote control command;
if the system judges that the medicament to be added is an acidic solution, the system opens the acid liquor storage tank outlet valve 14, the dosing pump inlet valve 17 and the dosing pump outlet valve 19 and then starts the dosing pump 18, and stops the dosing pump 18 after the flow meter measures that the set amount is reached, and stops the acid liquor storage tank outlet valve 14, the dosing pump inlet valve 17 and the dosing pump outlet valve 19;
if the system judges that the medicament to be added is alkaline solution, the system opens the acid liquor storage tank outlet valve 14, the dosing pump inlet valve 17 and the dosing pump outlet valve 19, starts the dosing pump 18, stops the dosing pump 18 when the flow meter measures that the set quantity is reached or the measured value of the liquid level meter 27 reaches 90% of the effective volume of the metering neutralization tank, and closes the acid liquor storage tank outlet valve 14, the dosing pump inlet valve 17 and the dosing pump outlet valve 19;
adding the medicament into the metering neutralization tank 21, carrying out neutralization reaction in the tank, remotely checking an online PH meter after the neutralization reaction is finished for a period of time to obtain a measured value, and finishing the neutralization reaction if the measured value reaches 6.5-7.5.
If the measured value of the online PH meter is less than 6.5 or more than 7.5, the system executes according to the steps 3 and 4;
the PH automatic measurement dosing controller 31 is turned off.
Step three: evaporating and drying the radioactive concentrated waste liquid
Placing the waste barrel in an in-barrel dryer through a roller way;
opening an outlet valve 22 of the metering neutralization tank and an inlet valve 5 of the dryer in the barrel, discharging waste liquid in the metering neutralization tank into the dryer 6 in the barrel, and closing the outlet valve 22 of the metering neutralization tank and the inlet valve 5 of the dryer in the barrel by interlocking after the liquid level of the dryer 6 in the barrel reaches 80%;
opening a condenser inlet valve 8, starting a dryer in the barrel for evaporation drying, allowing steam at the moment to enter a condenser 9 for condensation through a steam-water separation filter 7, starting a condensate discharging pump 11 to discharge to a special water discharge and collection system of a factory building by opening a condensate discharging pump inlet valve 10 and a condensate discharging pump outlet valve 12 after condensate generated by condensation reaches a certain liquid level height, closing the condensate discharging pump 11 after discharging is finished, and closing the condensate discharging pump inlet valve 10 and the condensate discharging pump outlet valve 12.
When the liquid level of the condenser does not rise any more within a certain period of time, indicating that the evaporation of the waste liquid of the dryer in the barrel reaches the requirement, opening the outlet valve 22 of the metering neutralization tank and the inlet valve 5 of the dryer in the barrel, discharging the waste liquid in the metering neutralization tank into the dryer 6 in the barrel, closing the outlet valve 22 of the metering neutralization tank and the inlet valve 5 of the dryer in the barrel through linkage after the liquid level of the dryer in the barrel reaches a certain height, and circularly performing until the weight of the drying device in the barrel reaches a certain quantity or the liquid level of the solid in the barrel reaches a certain height, and stopping the heating device, thereby completing the evaporation and drying operation of a single barrel;
repeating the steps until all the radioactive concentrated waste liquid in the metering neutralization tank 21 is evaporated and dried;
and (4) performing subsequent treatment on the evaporated and dried waste barrel according to the process flow.
Claims (8)
1. An automatic metering neutralization device comprises an automatic metering unit and an automatic neutralization unit, and is characterized in that: the automatic metering unit comprises a metering neutralization tank inlet valve (20), a metering neutralization tank (21), a metering neutralization tank outlet valve (22), a stirring paddle (23), a stirring paddle motor (24), a metering neutralization tank exhaust filter (25), an exhaust valve (26), a liquid level meter (27) and a pressure gauge (28); the inlet valve (20) of the metering neutralization tank is connected with the metering neutralization tank (21) in a flange mode through a pipeline, the bottom of the metering neutralization tank (21) is connected with the outlet valve (22) of the metering neutralization tank through a pipeline, and the outlet valve (22) of the metering neutralization tank is connected with the inlet valve (5) of the dryer in the barrel through a pipeline; the top of the metering neutralization tank (21) is connected with a metering neutralization tank exhaust filter (25) in a flange mode through a pipeline, the metering neutralization tank exhaust filter (25) is connected with an exhaust valve (26) through a pipeline, the exhaust valve (26) is connected with a factory equipment exhaust system through a pipeline, the top of the metering neutralization tank (21) is connected with a liquid level meter (27) and a pressure meter (28) in a flange mode through pipelines, and a stirring paddle motor (24) is installed at the top of the metering neutralization tank (21) and is connected with a stirring paddle (23) through a torsion bar.
2. An automatic metering neutralization apparatus as claimed in claim 1 wherein: the automatic neutralization unit comprises an acid liquor storage tank (13), an alkali liquor storage tank (15), a dosing pump (18), an acid liquor storage tank outlet valve (14), an alkali liquor storage tank outlet valve (16), a dosing pump inlet valve (17), a dosing pump outlet valve (19), an online PH meter (29), a flange (30), a PH automatic measurement dosing controller (31), a remote control console (32) and a flowmeter (33); the top of the metering neutralization tank (21) is connected with a dosing pump outlet valve (19) in a flange mode through a pipeline, a flow meter (33) is installed on an intermediate pipeline, the dosing pump outlet valve (19) is connected with a dosing pump (18) through a pipeline, the dosing pump (18) is connected with a dosing pump inlet valve (17) through a pipeline, the dosing pump inlet valve (17) is respectively connected with an acid liquor storage tank outlet valve (14) and an alkali liquor storage tank outlet valve (16) through pipelines, and the acid liquor storage tank outlet valve (14) extends into the bottom of an acid liquor storage tank (13) through a pipeline.
3. An automatic metering neutralization apparatus as claimed in claim 2 wherein: alkali lye holding vessel outlet valve (16) stretch into alkali lye holding vessel (15) bottom through the pipeline, install in the measurement and inside groove (21) online PH meter (29) through the flange form, and be connected to PH automatic measure through the measuring line and add medicine controller (31), wherein acid lye holding vessel outlet valve (14), alkali lye holding vessel outlet valve (16), add medicine pump inlet valve (17), add medicine pump outlet valve (19), add medicine pump (18), flowmeter (33), the appearance accuse signal of level gauge (27) passes through the cable and is connected with PH automatic measure and add medicine controller (31), PH automatic measure adds medicine controller (31) and is connected with the remote control operation panel through the cable conductor.
4. An automatic metering neutralization method, characterized in that: the method comprises the following steps: conveying the radioactive concentrated waste liquid to a metering neutralization tank; step two: neutralizing the radioactive concentrated waste liquid; step three: evaporating and drying the radioactive concentrated waste liquid.
5. The automatic metering neutralization method of claim 4, wherein: the method comprises the following steps: the radioactive concentrated waste liquid is conveyed to a metering neutralization tank, and the method comprises the following steps:
after the radioactive waste liquid is subjected to evaporation treatment by an evaporator of a radioactive waste liquid treatment system, the generated concentrated waste liquid is conveyed into a concentrated waste liquid receiving tank (1) through a concentrated waste pump for storage, and after temporary storage and decay, an outlet valve (2) of the concentrated waste liquid receiving tank, an inlet valve (3) of the concentrated waste liquid conveying pump, an inlet valve (20) of a metering neutralization tank and an exhaust valve (26) are opened;
(II) starting a concentrated waste liquid conveying pump (4), conveying the radioactive concentrated waste liquid to a metering neutralization tank (21), and stopping the concentrated waste liquid conveying pump (4) to meter an inlet valve (20) of the neutralization tank by interlocking control when a liquid level meter (27) neutralizes 70% of the effective volume of the tank; and an outlet valve (2) of the closed valve concentrated waste liquid receiving groove and an inlet valve (3) of a concentrated waste liquid conveying pump are used for conveying radioactive concentrated waste liquid.
6. The automatic metering neutralization method of claim 4, wherein: step two: the method for neutralizing the radioactive concentrated waste liquid comprises the following steps:
starting a PH automatic measuring and dosing controller (31), measuring the PH value of the radioactive concentrated waste liquid in the measuring and neutralizing tank (21) by an online PH meter (29), and obtaining the volume of the radioactive concentrated waste liquid in the measuring and neutralizing tank (21) by a liquid level meter (27);
secondly, starting a stirring paddle motor (24) to enable the stirring paddle to be in a working state;
and (III) the PH automatic measurement dosing controller (31) judges the medicament to be neutralized according to the PH value and the volume of the radioactive concentrated waste liquid, calculates the amount of the medicament to be added, and executes the neutralization dosing operation through a remote control command.
7. The automatic metering neutralization method of claim 4, wherein: step two: the method also comprises the following steps:
if the system judges that the medicament to be added is an acidic solution, the system opens an acid liquor storage tank outlet valve (14), a dosing pump inlet valve (17) and a dosing pump outlet valve (19), then starts a dosing pump (18), stops the dosing pump (18) when the flow meter measures a set amount, and closes the acid liquor storage tank outlet valve (14), the dosing pump inlet valve (17) and the dosing pump outlet valve (19);
if the system judges that the medicament to be added is alkaline solution, the system opens an acid liquor storage tank outlet valve (14), a dosing pump inlet valve (17) and a dosing pump outlet valve (19), then starts a dosing pump (18), stops the dosing pump (18) when the flow meter measures a set amount or the measured value of a liquid level meter (27) reaches 90% of the effective volume of the metering neutralization tank, and closes the acid liquor storage tank outlet valve (14), the dosing pump inlet valve (17) and the dosing pump outlet valve (19);
adding the medicament into a metering neutralization tank (21), carrying out neutralization reaction in the tank, remotely checking an online PH meter after the neutralization reaction is finished for a period of time to obtain a measured value, and finishing the neutralization reaction if the measured value reaches 6.5-7.5;
(IV) if the measured value of the online PH meter is less than 6.5 or more than 7.5, the system executes according to the steps 3 and 4;
and (V) closing the PH automatic measuring and dosing controller (31).
8. The automatic metering neutralization method of claim 4, wherein: step three: the evaporation and drying of the radioactive concentrated waste liquid comprises the following steps:
placing a waste barrel in an in-barrel dryer through a roller way;
opening an outlet valve (22) of the metering neutralization tank and an inlet valve (5) of the dryer in the barrel, discharging waste liquid in the metering neutralization tank into the dryer (6) in the barrel, and closing the outlet valve (22) of the metering neutralization tank and the inlet valve (5) of the dryer in the barrel through linkage after the liquid level of the dryer (6) in the barrel reaches 80%;
thirdly, an inlet valve (8) of a condenser is opened, a dryer in the barrel is started to evaporate and dry, steam at the moment enters a condenser (9) through a steam-water separation filter (7) to be condensed, after condensed water generated by condensation reaches a certain liquid level height, a condensate discharging pump inlet valve (10) and a condensate discharging pump outlet valve (12) are opened, a condensate discharging pump (11) is started to discharge to a special water discharging and collecting system of a factory building, the condensate discharging pump (11) is closed after discharging is finished, and the condensate discharging pump inlet valve (10) and the condensate discharging pump outlet valve (12) are closed;
fourthly, when the liquid level of the condenser does not rise any more within a certain time, indicating that the evaporation of the waste liquid of the dryer in the barrel reaches the requirement, opening an outlet valve (22) of the metering neutralization tank and an inlet valve (5) of the dryer in the barrel, discharging the waste liquid in the metering neutralization tank into the dryer (6) in the barrel, closing the outlet valve (22) of the metering neutralization tank and the inlet valve (5) of the dryer in the barrel through linkage after the liquid level of the dryer in the barrel reaches a certain height, and circularly carrying out the operation until the weight of a drying device in the barrel reaches a certain quantity or the liquid level of solid in the barrel reaches a certain height, and stopping the heating device, thereby completing the operation of single-barrel evaporation and drying;
fifthly, the steps are repeated until all the radioactive concentrated waste liquid in the metering neutralization tank (21) is evaporated and dried;
and (VI) performing subsequent treatment on the evaporated and dried waste barrel according to the process flow.
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| CN117430228A (en) * | 2023-10-31 | 2024-01-23 | 四川英创力电子科技股份有限公司 | Automatic discharging device and method for detecting and treating liquid medicine collection |
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| CN117430228A (en) * | 2023-10-31 | 2024-01-23 | 四川英创力电子科技股份有限公司 | Automatic discharging device and method for detecting and treating liquid medicine collection |
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