CN115325784A - Operation method of radioactive humid waste drying treatment system - Google Patents
Operation method of radioactive humid waste drying treatment system Download PDFInfo
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- CN115325784A CN115325784A CN202210861400.6A CN202210861400A CN115325784A CN 115325784 A CN115325784 A CN 115325784A CN 202210861400 A CN202210861400 A CN 202210861400A CN 115325784 A CN115325784 A CN 115325784A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
- F26B9/066—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers the products to be dried being disposed on one or more containers, which may have at least partly gas-previous walls, e.g. trays or shelves in a stack
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
- F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
- F26B21/086—Humidity by condensing the moisture in the drying medium, which may be recycled, e.g. using a heat pump cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/001—Handling, e.g. loading or unloading arrangements
- F26B25/003—Handling, e.g. loading or unloading arrangements for articles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/008—Seals, locks, e.g. gas barriers or air curtains, for drying enclosures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/009—Alarm systems; Safety sytems, e.g. preventing fire and explosions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
- F26B25/08—Parts thereof
- F26B25/12—Walls or sides; Doors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
- F26B3/04—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour circulating over or surrounding the materials or objects to be dried
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
- F26B5/044—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum for drying materials in a batch operation in an enclosure having a plurality of shelves which may be heated
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B7/00—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/28—Treating solids
- G21F9/30—Processing
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/28—Treating solids
- G21F9/34—Disposal of solid waste
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Abstract
The invention relates to an operation method of a radioactive humid waste drying treatment system, and belongs to the technical field of environmental protection. The drying treatment system comprises a drying box with hot air circulation, a nitrogen supply system, an atmosphere replacement branch, a gas detection unit and a condensate box. In the treatment process, moisture in the humid air is cooled and separated to be converted into condensate to be collected, and the dry air is sent back to the hot air circulation pipeline; is suitable for various radioactive solid wet wastes, and has economic operation cost. And the gas components in the heating and drying links are detected and monitored on line in the treatment process, and the safety can be ensured by corresponding measures such as air replacement, nitrogen filling and the like in time and appropriately, and the reduction of secondary pollution is facilitated.
Description
Technical Field
The invention relates to a waste treatment method, in particular to an operation method of a radioactive solid wet waste drying treatment system, and belongs to the technical field of environmental protection.
Background
Moist waste and pit sludge are the major radioactive solid wastes generated by nuclear power plant operations. The waste needs to be dried firstly, so that the moisture contained in the waste is reduced, the waste meets the requirement of subsequent compaction treatment, and then the waste is compacted.
The Chinese patent with the application number of 202110459797.1 discloses a dryer for drying treatment in a middle-low radioactive solid waste barrel, wherein a drying system and a water vapor treatment system of the dryer are connected with a dryer main body, the dryer main body is a sealed drying box, a circulator air inlet, a circulator air outlet and a wet air suction opening are arranged on the sealed drying box, the sealed drying box is connected with the drying system through the circulator air inlet and the circulator air outlet, and the sealed drying box is connected with the water vapor treatment system through the wet air suction opening. The technical scheme has the defects that: the gas state in the drying process is not monitored, and potential safety hazards possibly caused by CO and other flammable and combustible gases generated by decomposition in the drying process of the wet waste of the nuclear power station cannot be solved. In addition, a Chinese patent with the application number of 201810203314.X discloses a vacuum microwave drying system and a drying method in a radioactive wet type waste barrel, the technical scheme adopts vacuum microwave heating to dry waste, the power consumption is high, the safety is poor, and the system and the method are generally only suitable for treating radioactive raffinate with high water content in a nuclear power station and are not suitable for conventional damp waste and pit sludge radioactive solid waste with various damp waste types and low water content.
Disclosure of Invention
The invention aims to: aiming at the defects of the prior art, the operation method of the radioactive humid waste drying treatment system is provided, which can properly solve the problem that flammable and explosive gases are decomposed in the drying process of the humid waste of the nuclear power station, and has the advantages of wide application range and economic operation cost.
In order to achieve the aim of the invention, the basic technical scheme of the operation method of the radioactive humid waste drying treatment system comprises the following steps: the drying treatment system comprises a drying box, the top and the lower part of the drying box are respectively provided with an air outlet interface and an air inlet interface, and a hot air circulation loop is formed between the air outlet interface and the air inlet interface through a circulation pipeline provided with a control valve, a heating fan and a heater; the air inlet interface is also connected with a nitrogen supply system of a factory building through a break control valve, and a replacement branch communicated with the atmosphere through an air replacement valve is connected between the control valve and the heating fan; the air outlet pipeline between the air outlet port and the control valve is also connected with a gas detection unit in parallel; the gas detection unit consists of a first steam-water separator, a gas detection pump and a hazardous gas detector which are connected in series; a water outlet of the first steam-water separator is communicated with a condensate tank of the condensing unit through a drainage pump; the upper part of the condensate tank is communicated with an air outlet pipeline through a metering tank, a second steam-water separator and a condenser which are connected in series; the upper part of the condensate tank is also communicated to an external waste gas treatment system through a vacuum fan and a vacuum pipeline valve; one path of a water outlet of the second steam-water separator is connected to the vacuum fan, the other path of the water outlet of the second steam-water separator is connected to an air inlet of the cooling fan, one path of an air outlet of the cooling fan is connected to the hot air circulation loop through a condensing pipeline valve, and the other path of the air outlet of the cooling fan is communicated to an external waste gas treatment system;
the drying treatment system comprises the following operation steps
Firstly, inputting, namely conveying a container filled with radioactive wet waste to be treated into a drying box;
step two, heating, namely, a condensing pipeline valve and a vacuum pipeline valve are normally opened, and a vacuum fan is started to form micro negative pressure in a drying box; opening a control valve, starting a heating fan and a heater, and enabling the temperature in the drying box to reach a set value through hot air circulation;
thirdly, detecting that a dangerous gas detector collects gas of an air outlet pipe of the drying box on line and judging whether the gas exceeds a first threshold value; if yes, carrying out the next step; if not, carrying out the seventh step;
fourthly, ventilation, namely closing the heater, the control valve and the condensing pipeline valve, opening the air replacement valve, the cooling fan and the waste discharge pipeline valve, introducing air outside the system, and replacing the air in the drying box;
fifthly, rechecking, namely sampling the gas of the air outlet pipe of the drying box again by the dangerous gas detector, and judging whether the gas exceeds the first threshold value again; if yes, carrying out the next step; if not, carrying out the seventh step;
sixthly, inflating, namely keeping the heater, the control valve and the condensing pipeline valve closed, closing the air replacement valve, opening the on-off control valve to inject a preset amount of nitrogen into the drying box, and returning to the third step;
step seven, drying, namely starting a cooling fan, and introducing chilled water into a condenser for heat exchange; the condensed water is subjected to gas-liquid separation by a second steam-water separator; the cooled dehydrated and dried air is heated again and enters a drying box;
eighthly, monitoring, namely, the dangerous gas detector collects the gas of the air outlet pipe of the drying oven on line and judges whether the gas exceeds a first threshold value or not; if yes, carrying out the next step; if not, carrying out the tenth step;
ninth, replacing, namely closing the heater, the control valve and the condensing pipeline valve, opening the air replacement valve, the cooling fan and the waste discharge pipeline valve, and introducing air outside the system into the gas in the replacement drying box;
step ten, retesting, namely the dangerous gas detector samples the gas of the air outlet pipe of the drying oven again and judges whether the first threshold value is exceeded or not again; if yes, carrying out the next step; if not, carrying out the tenth step;
step ten, retesting, namely sampling the gas of the air outlet pipe of the drying box by a dangerous gas detector, and judging whether the gas exceeds a second threshold value which is larger than the first threshold value; if yes, carrying out the next step; if not, returning to the ninth step;
step ten, injecting gas, namely keeping the heater, the control valve and the condensing pipeline valve closed, closing the air replacement valve, opening the on-off control valve, injecting a predetermined amount of nitrogen into the drying box, and returning to the eighth step;
step three, cooling, namely turning off the heater; when the temperature in the drying box is lower than a set value, stopping introducing the chilled water into the condenser, maintaining the preset time, and closing the heating fan, the cooling fan and the vacuum fan;
and step fourteen, outputting, namely outputting the processed container to a drying box and carrying away.
Because the drying treatment operation method of the invention carries out drying in a hot air circulation mode, in the treatment process, moisture in the moisture-containing air is changed into condensate through cooling and separation, and the condensate is collected, and the dried air is sent back to the hot air circulation pipeline; is suitable for various radioactive humid wastes, and has economic operation cost. And the gas components in the heating and drying links are detected and monitored on line in the treatment process, and the safety can be ensured by corresponding measures such as air replacement, nitrogen filling and the like in time and appropriately, and the secondary pollution can be reduced.
The invention further perfects that in the seventh step, the liquid separated by the second steam-water separator flows into the condensate tank for storage after entering the metering tank for metering.
A further improvement of the invention is that the seventh step judges whether the generation time of the condensate in unit volume recorded by the metering tank is less than a preset value, if so, the drying is continued; if not, the next step is carried out.
Still further perfection of the present invention is that said hazardous gas detector comprises a CO gas component detector and a combustible gas detector.
The invention is further perfected in that a cooling pipeline from a chilled water outlet to a chilled water inlet is arranged in the condenser.
The invention is further perfected in that a condensate sampling port and a waste water collecting port are arranged at the bottom of the condensate tank.
It is a still further refinement of the present invention that the vacuum line valve passes through an exhaust gas filter before passing to an external exhaust gas treatment system.
Drawings
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
FIG. 1 is a schematic view of a processing system according to an embodiment of the present invention.
FIG. 2 is a logic block diagram of the processing method of the embodiment of FIG. 1.
Detailed description of the preferred embodiment
The radioactive moist waste treatment system of the embodiment is configured as shown in fig. 1, the top and the lower part of a drying box 12 with a split door 11 are respectively provided with an air outlet interface and an air inlet interface, and a hot air circulation loop is formed between the air outlet interface and the air inlet interface through a circulation pipeline provided with a control valve 16, a heating fan 14 and a heater 13. And the air inlet interface is also connected with a nitrogen supply system N of the factory building through a break control valve, and a replacement branch communicated with the atmosphere through an air replacement valve 17 is connected between the control valve 16 and the heating fan 14. And a roller way 1 convenient for conveying is arranged outside the split doors 11.
The air outlet pipeline between the air outlet port and the control valve 16 is also connected in parallel with a gas detection unit, and the gas detection unit is composed of a first steam-water separator 34, a gas detection pump 33, a CO gas component detector 31 and a combustible gas detector 32 which are connected in series. Wherein the drain of the first steam-water separator 34 leads via a drain pump 35 to the condensate tank 26 of the condensation unit. The upper part of the condensate tank 26 is led to an air outlet pipeline through a metering tank 23, a second steam-water separator 22 and a condenser 21 which are connected in series. A cooling pipeline from a chilled water outlet OUT to a chilled water inlet IN is provided inside the condenser 21. The bottom of the condensate tank 26 is provided with a condensate sampling port C and a waste water collection port W. The upper part of the condensate tank 26 also leads via a vacuum fan 25 and a vacuum line valve 28 and the exhaust gas filter device 18 to an external exhaust gas treatment system F.
One path of the water outlet of the second steam-water separator 22 is connected to the vacuum fan 25, the other path is connected to the air inlet of the cooling fan 24, one path of the air outlet of the cooling fan 24 is connected to the hot air circulation loop through the condensation pipeline valve 27, and the other path is led to the external waste gas treatment system F through the waste discharge pipeline valve 29, the vacuum pipeline valve 28 and the exhaust filtering device 18.
The feeding of this embodiment adopts the roll table to carry, and the connecting tube outward appearance all coats the heat preservation.
Referring to fig. 2, the steps of performing the drying process by using the radioactive humid waste treatment system of the embodiment are as follows:
first step, input-open door 11, with the help of roller table 1, the container with the radioactive moist waste to be treated is sent into the drying box 12, closing the door.
Secondly, heating, namely the condensation pipeline valve 27 and the vacuum pipeline valve 28 are normally opened, starting the vacuum fan 25, and forming micro negative pressure of-180 to-220 pa in the drying box 12; the control valve 16 is opened, the heating fan 14 and the heater 13 are started, and the temperature in the drying oven 12 reaches the set value of 160 +/-5 ℃ through hot air circulation.
Thirdly, detecting, namely acquiring gas of an air outlet pipe of the drying box 12 on line by using a CO gas component detector 31 and a combustible gas detector 32, and judging whether the gas exceeds a first threshold value or not; if yes, carrying out the next step; if not, the seventh step is carried out.
And fourthly, ventilation, namely primary alarm, closing the heater 13, the control valve 16 and the condensation pipeline valve 27, keeping the heating fan 14 and the vacuum pipeline valve 28 open, and opening the air replacement valve 17, the cooling fan 24 and the waste discharge pipeline valve 29, wherein the vacuum fan 25 and the cooling fan 24 introduce air outside the system to replace the air in the drying box 12.
Fifthly, rechecking, namely sampling the gas of the air outlet pipe of the drying box 12 again by the CO gas component detector 31 and the combustible gas detector 32, and judging whether the gas exceeds the first threshold value again; if yes, carrying out the next step; if not, the seventh step is carried out.
And sixthly, inflating and secondary alarming, wherein the heater 13, the control valve 16 and the condensation pipeline valve 27 are kept closed, the heating fan 14, the cooling fan 24, the waste discharge pipeline valve 29, the vacuum fan 25 and the vacuum pipeline valve 28 are kept opened, the air replacement valve 17 is closed, the on-off control valve is opened, a preset amount of nitrogen is injected into the drying box 12, and the third step is returned.
Seventhly, drying, namely keeping the control valve 16 open, starting the cooling fan 24, and introducing chilled water into the condenser 21 for heat exchange; the condensed water is subjected to gas-liquid separation by the second steam-water separator 22, and the liquid flows into the condensed liquid tank 26 for storage after entering the metering tank 23 for metering; the cooled dehydrated and dried air passes through the cooling fan 24 and the heating fan 14 and is heated again by the heater 13 to enter the drying box 12;
judging whether the generation time of the condensate in unit volume recorded by the metering tank is less than a preset value of 0.5L/h or not, if so, continuing drying; if not, entering the next step; this makes it possible to judge and grasp the drying completion time more favorably.
Eighthly, monitoring, namely collecting the gas of an air outlet pipe of the drying box 12 on line by using a CO gas component detector 31 and a combustible gas detector 32, and judging whether the gas exceeds a first threshold value; if yes, carrying out the next step; if not, the third step is carried out.
And ninth step, replacement, namely primary alarm, closing the heater 13, the control valve 16 and the condensation pipeline valve 27, keeping the heating fan 14 and the vacuum pipeline valve 28 open, and opening the air replacement valve 17, the cooling fan 24 and the waste discharge pipeline valve 29, wherein the vacuum fan 25 and the cooling fan 24 introduce air outside the system to replace the air in the drying box 12.
Tenth, retesting, namely sampling the gas in the air outlet pipe of the drying box 12 again by the CO gas component detector 31 and the combustible gas detector 32, and judging whether the gas exceeds the first threshold value again; if yes, carrying out the next step; if not, go to the tenth step.
The eleventh step, retest-the gas of the air outlet pipe of the drying oven 12 is sampled by the CO gas component detector 31 and the combustible gas detector 32, and whether the gas exceeds a second threshold value which is larger than the first threshold value is judged; if yes, carrying out the next step; and if not, returning to the ninth step.
And a twelfth step of gas injection-secondary alarm, namely keeping the heater 13, the control valve 16 and the condensation pipeline valve 27 closed, keeping the heating fan 14, the cooling fan 24, the waste discharge pipeline valve 29, the vacuum fan 25 and the vacuum pipeline valve 28 open, closing the air replacement valve 17, opening the on-off control valve, injecting a predetermined amount of nitrogen into the drying box 12, and returning to the eighth step.
Step three, cooling, namely turning off the heater; the heating fan and the cooling fan continuously work; when the temperature in the drying box 12 is lower than the set value of 40 ℃, stopping introducing the chilled water into the condenser 21, maintaining for 10 +/-1 minutes, and closing the heating fan 14, the cooling fan 24 and the vacuum fan 25;
and a fourteenth step of outputting, namely opening the split door 11, and outputting the treated container to a drying box by means of the roller way 1.
Compared with the prior art, the embodiment has the following remarkable advantages:
1. the water content of the moist waste can be effectively reduced with economic cost, the requirement of drying treatment and disposal of the radioactive moist waste is met, and the emission standard of radioactive waste gas is met.
2. The combustible and explosive gas mixture possibly generated by decomposition of the heated air and the wet waste during heating is subjected to real-time online detection, and the emergency treatment is rapidly carried out on abnormal working conditions by adopting treatment measures such as ventilation and inflation, so that the drying can be smoothly finished.
3. The gas mixture discharged by decomposing the heated air and the humid waste is subjected to online detection for a plurality of times in real time in the drying process, and a corresponding multi-level threshold alarm mechanism is adopted, so that accidents caused by abnormal working conditions can be effectively avoided.
4. Because the abnormal working condition is not only treated by adopting air replacement and nitrogen gas injection in a multi-link way, but also is carried out in multiple steps of heating and drying, the safe and reliable operation is ensured.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (7)
1. An operation method of a radioactive humid waste drying treatment system comprises a drying box, wherein the top and the lower part of the drying treatment system are respectively provided with an air outlet interface and an air inlet interface, and a hot air circulation loop is formed between the air outlet interface and the air inlet interface through a circulation pipeline provided with a control valve, a heating fan and a heater; the method is characterized in that: the air inlet interface is also connected with a nitrogen supply system of a factory building through a break control valve, and a replacement branch communicated with the atmosphere through an air replacement valve is connected between the control valve and the heating fan; the air outlet pipeline between the air outlet port and the control valve is also connected with a gas detection unit in parallel; the gas detection unit consists of a first steam-water separator, a gas detection pump and a hazardous gas detector which are connected in series; the water outlet of the first steam-water separator is communicated to a condensate tank of the condensing unit through a drain pump; the upper part of the condensate tank is communicated with an air outlet pipeline through a metering tank, a second steam-water separator and a condenser which are connected in series; the upper part of the condensate tank is also communicated to an external waste gas treatment system through a vacuum fan and a vacuum pipeline valve; one path of an exhaust port of the second steam-water separator is connected to the vacuum fan, the other path of the exhaust port of the second steam-water separator is connected to an air inlet of the cooling fan, one path of an air outlet of the cooling fan is connected to the hot air circulation loop through a condensing pipeline valve, and the other path of the air outlet of the cooling fan is communicated to an external waste gas treatment system;
the operation steps of the drying treatment system are as follows:
firstly, inputting, namely conveying a container filled with radioactive wet waste to be treated into a drying box;
step two, heating, namely, a condensing pipeline valve and a vacuum pipeline valve are normally opened, and a vacuum fan is started to form micro negative pressure in a drying box; opening a control valve, starting a heating fan and a heater, and enabling the temperature in the drying box to reach a set value through hot air circulation;
thirdly, detecting that a dangerous gas detector acquires gas of an air outlet pipe of the drying oven on line and judges whether the gas exceeds a first threshold value; if yes, carrying out the next step; if not, carrying out the seventh step;
fourthly, ventilation, namely closing the heater, the control valve and the condensing pipeline valve, opening an air replacement valve, a cooling fan and a waste discharge pipeline valve, introducing air outside the system, and replacing the air in the drying box;
fifthly, rechecking, namely sampling the gas of the air outlet pipe of the drying box again by the dangerous gas detector, and judging whether the gas exceeds the first threshold value again; if yes, carrying out the next step; if not, carrying out the seventh step;
sixthly, inflating, namely keeping the heater, the control valve and the condensing pipeline valve closed, closing the air replacement valve, opening the on-off control valve to inject a preset amount of nitrogen into the drying box, and returning to the third step;
step seven, drying, namely starting a cooling fan, and introducing chilled water into a condenser for heat exchange; the condensed water is subjected to gas-liquid separation by a second steam-water separator; the cooled dehydrated and dried air is heated again and enters a drying box;
eighthly, monitoring, namely, the dangerous gas detector collects the gas of the air outlet pipe of the drying oven on line and judges whether the gas exceeds a first threshold value or not; if yes, carrying out the next step; if not, carrying out the tenth step;
ninth, replacing, namely closing the heater, the control valve and the condensing pipeline valve, opening the air replacement valve, the cooling fan and the waste discharge pipeline valve, and introducing air outside the system into the gas in the replacement drying box;
tenth, retesting, namely sampling the gas in the air outlet pipe of the drying box again by the dangerous gas detector, and judging whether the gas exceeds the first threshold value again; if yes, carrying out the next step; if not, carrying out the tenth step;
step ten, retesting, namely sampling the gas of the air outlet pipe of the drying box by a dangerous gas detector, and judging whether the gas exceeds a second threshold value which is larger than the first threshold value; if yes, carrying out the next step; if not, returning to the ninth step;
step ten, injecting gas, namely keeping the heater, the control valve and the condensing pipeline valve closed, closing the air replacement valve, opening the on-off control valve, injecting a predetermined amount of nitrogen into the drying box, and returning to the eighth step;
step thirteen, cooling-turning off the heater; when the temperature in the drying box is lower than a set value, stopping introducing the chilled water into the condenser, maintaining the preset time, and closing the heating fan, the cooling fan and the vacuum fan;
and step fourteen, outputting, namely outputting the processed container to a drying box and carrying away.
2. The method of operating a radioactive wet waste drying process system according to claim 1, wherein: and in the seventh step, the liquid separated by the second steam-water separator flows into a condensate tank for storage after entering a metering tank for metering.
3. The method of operating a radioactive wet waste drying system according to claim 2, wherein: the seventh step of judging whether the generation time of the condensate in unit volume recorded by the metering tank is less than a preset value, if so, continuing drying; if not, the next step is carried out.
4. A method of operating a radioactive wet waste drying treatment system according to claim 3, wherein: the hazardous gas detector comprises a CO gas component detector and a combustible gas detector.
5. The method of operating a radioactive wet waste drying system according to claim 4, wherein: and a cooling pipeline from a chilled water outlet to a chilled water inlet is arranged in the condenser.
6. The method of operating a radioactive wet waste drying system according to claim 5, wherein: and a condensate sampling port and a wastewater collecting port are arranged at the bottom of the condensate tank.
7. The method of operating a radioactive wet waste drying system according to claim 6, wherein: the vacuum pipeline valve passes through an exhaust filtering device before leading to an external exhaust treatment system.
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| JPH02263200A (en) * | 1988-12-30 | 1990-10-25 | Shiyoujimisao Seisakusho:Kk | Pretreating device for radioactive waste |
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| CN106558352A (en) * | 2016-11-24 | 2017-04-05 | 航天晨光股份有限公司 | A kind of tapered drying device of nuclear power station spent resin |
| CN107830698A (en) * | 2017-12-07 | 2018-03-23 | 航天晨光股份有限公司 | Drying system and drying means in a kind of radioactive solid waste stove |
| CN108630335A (en) * | 2018-03-13 | 2018-10-09 | 中国核电工程有限公司 | Vacuum microwave drying system and drying means in a kind of radioactivity wet type pail for used dressings |
| CN113915967A (en) * | 2021-09-30 | 2022-01-11 | 武汉海王新能源工程技术有限公司 | Drying station and drying method in wet waste barrel |
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2022
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02263200A (en) * | 1988-12-30 | 1990-10-25 | Shiyoujimisao Seisakusho:Kk | Pretreating device for radioactive waste |
| JP3170761U (en) * | 2011-07-15 | 2011-09-29 | 正春 李 | Dryer hot air circulation controller |
| CN106558352A (en) * | 2016-11-24 | 2017-04-05 | 航天晨光股份有限公司 | A kind of tapered drying device of nuclear power station spent resin |
| CN107830698A (en) * | 2017-12-07 | 2018-03-23 | 航天晨光股份有限公司 | Drying system and drying means in a kind of radioactive solid waste stove |
| CN108630335A (en) * | 2018-03-13 | 2018-10-09 | 中国核电工程有限公司 | Vacuum microwave drying system and drying means in a kind of radioactivity wet type pail for used dressings |
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