JP5954704B2 - Closed system flue gas treatment system - Google Patents

Description

  The present invention relates to a closed system flue gas treatment system. In particular, the present invention relates to a closed-system smoke treatment system for treating waste containing radioactive materials.

  Conventionally, it is a waste incineration method that removes the flue gas from the incinerator with a dust collector and cleans the exhaust gas from the dust by the wet smoke cleaning method. By converting the sludge into sludge and returning it to the incinerator, the dioxins in the sludge are thermally decomposed, and heavy metals are returned to the dust collector along with the flue gas through the incinerator. A method for incineration of waste or the like to be taken out as collected ash is known (for example, see Patent Document 1). According to the method for incinerating wastes and the like described in Patent Document 1, dioxins and heavy metals in smoke-washed sludge can be decomposed without using a special device when incinerating wastes. Can be collected in one place.

JP 2004-325010 A

  However, in the method for incineration of wastes and the like described in Patent Document 1, it is not possible to prevent outflow of radioactive substances from the incinerator or the like into the environment. Moreover, in the incineration method of waste etc. described in patent document 1, when the waste material containing a radioactive substance is incinerated, the high concentration radioactive substance concentrated in an incinerator cannot be handled.

  Accordingly, an object of the present invention is to provide a closed system that can prevent outflow of radioactive material into the environment when a material containing radioactive material is burned, and can appropriately manage high-concentration radioactive material generated after incineration of waste materials. The object is to provide a flue gas treatment system.

In order to achieve the above object, the present invention provides a combustion section for discharging exhaust gas containing combustion gas and smoke generated by combustion of waste materials containing radioactive materials and incineration ash generated by combustion of waste materials, and discharging from the combustion section. The exhaust gas transfer path through which the exhaust gas is transferred, the suction port into which the exhaust gas transferred through the exhaust gas transfer path is introduced, and the water to be brought into contact with the exhaust gas at a flow rate faster than the flow rate at the water introduction portion. An ejector having a water supply port for supplying inside and generating a negative static pressure inside, a discharge port for discharging a mixed liquid in which exhaust gas and water are mixed, and a mixed liquid discharged from the discharge port It has a wet cyclone that introduces into the water and mixes the mixed liquid and water, and separates the water tank that stores the treated water mixed with the mixed liquid and water from the treated water and the solid substances resulting from the combustion gas and smoke. , Solid matter takes The water treatment unit that supplies the treated water to the ejector and the incineration ash discharged from the combustion unit are sucked, the incineration ash and the exhaust gas generated by the suction are separated, and the incineration ash is collected in a collection container and discharged There is provided a closed-system flue gas treatment system including an incineration ash treatment unit that supplies gas toward a suction port of an ejector .

Further, in the above closed system flue gas treatment system, the incineration ash treatment unit supplies exhaust gas to the suction port of the ejector through the tube at the rear stage of the incineration ash treatment unit, and the water tank has a lid that covers the treated water. It can also have the connection part which connects the inside of a water tank, and the exterior of a water tank.

In the above closed system flue gas treatment system, incineration ash processing unit, an inlet of the collection container at Rukoto closed with thermocompression bonding was recovered in the recovery container ash can also be vacuum-packed.

  Further, in the above closed system flue gas treatment system, a treated water supply port through which treated water from the water treatment unit is supplied between the suction port of the ejector and the exhaust gas transfer path, and an incineration ash treatment unit An intermediate introduction part having an exhaust gas supply port to which exhaust gas is supplied and an exhaust gas supply port to which exhaust gas transferred from the exhaust gas transfer path is supplied is further provided, and the suction port has been processed from the intermediate introduction part Water, exhaust gas and exhaust gas can also be supplied.

  Further, in the above closed system flue gas treatment system, the connecting portion may include a mist filter that prevents fine particles from being discharged from the water tank to the outside.

  Further, in the closed system flue gas treatment system, the incineration ash treatment unit can separate the incineration ash and the exhaust gas with a cyclone.

  According to the closed system flue gas treatment system according to the present invention, it is possible to prevent outflow of radioactive material into the environment when a material containing radioactive material is burned, and high-concentration radioactive material generated after incineration of waste materials. A closed flue gas treatment system that can be appropriately managed can be provided.

1 is a schematic diagram of a closed system flue gas treatment system according to a first embodiment of the present invention. It is a schematic diagram of the closed system flue gas processing system which concerns on the 2nd Embodiment of this invention.

[First Embodiment]
FIG. 1 shows an outline of a closed system flue gas treatment system according to a first embodiment of the present invention.

(Outline of closed system flue gas treatment system 1)
The closed system flue gas treatment system 1 according to the first embodiment is configured so that radioactive substances are generated in the environment from combustion gas, smoke, incineration ash, and the like generated by burning waste materials containing radioactive substances such as radioactive iodine and radioactive cesium. Combustion gas, smoke, and incineration ash are safely separated and processed while preventing them from being released into the atmosphere. The waste material processed by the closed-system smoke treatment system 1 is, for example, a woody material such as a tree or wood containing a radioactive substance.

(Outline of configuration of closed system flue gas treatment system 1)
The closed system flue gas treatment system 1 includes a combustion unit 10 that burns a waste material containing a radioactive substance, an exhaust gas transfer channel 12 that transfers exhaust gas from the combustion unit 10 to the outside of the combustion unit 10, and an exhaust gas transfer channel 12. An ejector 14 that mixes exhaust gas and water, a water tank 16 that introduces into the water a mixture of exhaust gas and water discharged from the ejector 14, and stores the treated water as treated water; The water treatment part 18 which isolate | separates the solid substance contained in water and water, the water pump 32 which supplies at least one part of the treated water stored in the water tank 16 to the ejector 14, and the incineration ash discharged | emitted from the combustion part 10 Incineration ash processing unit 20 that automatically seals the incineration ash to the recovery container 210 and an exhaust pump that is installed downstream of the incineration ash processing unit 20 and sucks the incineration ash toward the recovery container 210 in the incineration ash processing unit 20 0 and a.

(Combustion unit 10)
The combustion unit 10 burns a waste material containing a radioactive substance. And the combustion part 10 discharges | emits the exhaust gas containing combustion gas and smoke which generate | occur | produce with combustion of waste materials, and the incineration ash which arises by combustion of waste materials. Here, an exhaust gas transfer path 12 that transfers exhaust gas discharged from the combustion unit 10 is connected to the combustion unit 10. The exhaust gas transfer path 12 transfers the exhaust gas toward the ejector 14. On the other hand, the incineration ash is supplied to the incineration ash processing unit 20 by a certain amount using the extloader 220. In addition, if the combustion part 10 is an installation which incinerates a waste, various types of incinerators, such as a fixed furnace, can be used.

(Ejector 14)
The ejector 14 has at least three ports through which fluid and / or solids are introduced or discharged. Specifically, the ejector 14 includes a first port to which water that is a fluid is supplied, a second port that sucks fluid and / or solids, and water and a second port that are supplied to the first port. And a third port for discharging the sucked fluid and / or solid. The first port supplies water introduced from the outside into the ejector 14 at a flow rate faster than the flow rate of the water in the introduction portion. For example, the first port includes a path having a shape in which the cross-sectional diameter gradually decreases from one end toward the other end.

  And the negative static pressure generate | occur | produces in the inside of the ejector 14 with the water introduce | transduced into the inside of the ejector 14 with the flow velocity exceeding predetermined | prescribed flow velocity from the 1st opening | mouth. The second port uses the generated negative static pressure to suck fluid and / or solid, and the third port uses water supplied from the first port and fluid sucked by the second port and And / or discharging solids. The ejector 14 can be configured using a material excellent in corrosion resistance, heat resistance, mechanical characteristics, and the like, and can be configured using a metal material such as SUS, for example.

  More specifically, the ejector 14 includes a suction port 14a into which exhaust gas transferred through the exhaust gas transfer path 12 is introduced, and water that is brought into contact with the exhaust gas and generates negative static pressure inside the ejector 14. It has a water supply port 14b to be supplied and a discharge port 14c from which a mixed liquid in which exhaust gas and water are mixed is discharged. The mixed liquid is supplied to the water tank 16 from the discharge port 14c.

(Water tank 16)
The water tank 16 stores treated water 168 produced by mixing the liquid mixture and water into which the liquid mixture discharged from the discharge port 14c is introduced. Specifically, the water tank 16 has a liquid mixture introduction section 160 that introduces the liquid mixture from the discharge port 14 c into the water tank 16 and mixes the liquid mixture and water in water, and the liquid mixture introduction section 160 includes the liquid mixture and the liquid mixture. Mix with water to make treated water 168. Here, as the mixed liquid introducing section 160, not only the solid substance contained in the mixed liquid is separated from the mixed liquid into the water tank 16, but also a wet cyclone that mixes the mixed liquid and the water in the water tank 16 is used. it can. The mixed liquid introducing unit 160 can increase the contact time between the mixed liquid and water as compared with the case where the mixed liquid is introduced into the water tank 16 as it is from the discharge port 14c. In addition, the water tank 16 includes a lid 162 that covers the upper side of the treated water 168, and a connecting portion 164 as an air circulation path that connects the inside of the water tank 16 and the outside of the water tank 16. And the connection part 164 has the mist filter 166 which prevents that a micro particle | grain is discharge | released outside from the water tank 16 between the inside of the water tank 16 and the exterior of the water tank 16. FIG.

(Water treatment unit 18)
The water treatment unit 18 sucks up the treated water 168 stored in the water tank 16 and separates the solid substance contained in the treated water 168 from the treated water 168. Here, the solid substance is soot containing radioactive substances caused by combustion gas and smoke. Then, the water treatment unit 18 supplies treated water from which the solid substance has been removed via the pipe 182 to the water pump 32. The water pump 32 supplies the treated water to the water supply port 14b of the ejector 14. Further, the water treatment unit 18 has a filter 180 between one end where the treated water 168 is introduced and the other end where the treated water is discharged. The water treatment unit 18 collects the solid material contained in the treated water 168 using the filter 180. For example, filter paper can be used as the filter 180.

  Here, the water pump 32 sucks at least a part of the water in the water tank 16 or the treated water 168. Further, the water pump 32 sucks the treated water from the water treatment unit 18. The water pump 32 supplies the sucked treated water and the sucked water to the water supply port 14b of the ejector 14.

(Incineration ash treatment unit 20)
The incineration ash processing unit 20 receives the incineration ash discharged from the combustion unit 10 using the extloader 220. Then, the incineration ash processing unit 20 collects the incineration ash in the collection container 210 under reduced pressure. In this case, the incineration ash processing unit 20 uses the cyclone 200 to separate exhaust gas and incineration ash that are generated when the inside of the recovery container 210 is sucked for the purpose of reducing the pressure in the recovery container 210.

  The incineration ash processing unit 20 collects the incineration ash in the recovery container 210 and exhausts gas from the exhaust pump 30 provided at the rear stage of the incineration ash processing unit 20 toward the suction port 14a of the ejector 14 through the pipe 300. Supply. Further, the incineration ash processing unit 20 automatically closes the opening that is the inlet of the recovery container 210 and seals the incineration ash recovered in the recovery container 210. Note that the incineration ash treatment unit 20 may further include a radiation detection unit that measures the amount of radiation emitted from the collection container 210. In this case, the incineration ash processing unit 20 includes a radiation detection unit that measures the radiation dose, and a notification unit that issues an alarm to the worker in response to a signal that is emitted when the radiation detection unit detects a predetermined radiation dose. A radiation detection unit can be included.

  For example, the incineration ash processing unit 20 seals the collection container 210, a container holding unit that holds the collection container 210, an introduction unit (for example, a cyclone device) that introduces the incineration ash from the extloader 220 into the collection container 210, and the recovery container 210. And a sealing portion. The collection container 210 is a collection pack made of, for example, polyethylene. The incineration ash processing unit 20 thermocompresses the opening of the recovery pack to the sealing unit every time the incineration ash introduced into the recovery pack held in the container holding unit reaches a predetermined amount. Thereby, the incineration ash processing unit 20 vacuum-packs the collection pack.

(Effects of the first embodiment)
In the closed-system flue gas treatment system 1 according to the first embodiment, exhaust gas generated by combustion of waste materials containing radioactive substances is mixed with water in an ejector 14 to form a mixed solution. The solid material containing the radioactive material contained in the treated water 168 is collected in the water treatment unit 18. Then, the treated water from which the solid substance has been removed is returned to the ejector 14 again. Further, the incineration ash is collected in the collection container 210 in the incineration ash processing unit 20, and the exhaust gas generated by the collection is returned to the ejector 14 by the exhaust pump 30.

  Therefore, according to the closed system flue gas treatment system 1 according to the present embodiment, exhaust gas and incineration ash containing radioactive substances generated by combustion of waste materials containing radioactive substances are treated in the closed system flue gas treatment system 1. As a result, it is possible to prevent exhaust gas containing radioactive materials and incineration ash from being released into the environment. That is, the closed system flue gas treatment system 1 can significantly reduce or eliminate radioactive substances discharged into the environment during the waste treatment process, and can safely treat exhaust gas and incineration ash. Further, since the closed-system smoke treatment system 1 can circulate and reuse the treated water in the closed-system smoke treatment system 1, it suppresses the continuous supply of new water from the outside as the waste material is treated. it can.

  Further, according to the closed system flue gas treatment system 1, the contact time between the mixed liquid and water can be increased compared with the case where the mixed liquid introducing unit 160 introduces the mixed liquid into the water tank 16 as it is, so the ejector The exhaust gas contained in the mixed solution supplied from 14 can be efficiently washed with water.

  Furthermore, according to the closed system flue gas treatment system 1, the incineration ash enriched with radioactive substances can be automatically and unmannedly sealed in the recovery container 210 in the incineration ash treatment unit 20, thereby preventing the internal exposure of the worker, In addition, the entire amount of incinerated ash containing radioactive material that has been reduced and concentrated by combustion of waste materials containing radioactive material can be easily managed as high-concentration radioactive waste.

  Further, the closed system flue gas treatment system 1 according to the present embodiment combusts the exhaust gas transfer path 12, the ejector 14, the water tank 16 having the mixed liquid introduction unit 160, the water treatment unit 18, the incineration ash treatment unit 20, and the like. Since it can comprise by installing around the part 10, the closed system flue gas treatment system 1 which concerns on this Embodiment can be comprised easily irrespective of the type of the combustion part 10. FIG.

[Second Embodiment]
FIG. 2 shows an outline of a closed system flue gas treatment system according to the second embodiment of the present invention.

  The closed system flue gas treatment system 1a according to the second embodiment is a closed system according to the first embodiment except that an intermediate introduction part 40 is further provided between the exhaust gas transfer path 12 and the ejector 14. It has substantially the same configuration and function as the flue gas treatment system 1. Therefore, a detailed description is omitted except for differences.

  The intermediate introduction part 40 is installed between the exhaust gas transfer path 12 and the suction port 14 a of the ejector 14. The intermediate introduction unit 40 includes a treated water supply port 40b through which treated water from the water treatment unit 18 is supplied via a pipe 182a, and an exhaust gas supply through which exhaust gas from the incineration ash treatment unit 20 is supplied to the pipe 300a. It has a port 40c and an exhaust gas supply port 40a to which the exhaust gas transferred through the exhaust gas transfer path 12 is supplied. Then, the treated water, the exhaust gas, and the exhaust gas supplied to the intermediate introduction unit 40 merge in the intermediate introduction unit 40 and are collectively supplied from the outlet 40d to the suction port 14a of the ejector 14.

  In addition, between the inside of the intermediate introduction part 40 and the exhaust gas supply port 40a, between the inside of the intermediate introduction part 40 and the treated water supply port 40b, and between the inside of the intermediate introduction part 40 and the exhaust gas supply port 40c. A valve (for example, a ball valve) for adjusting the flow rate of the fluid flowing through each of the fluids may be provided between the two. Further, a reducer having a shape in which the cross-sectional diameter gradually decreases from the end of the exhaust gas transfer path 12 to the inlet of the exhaust gas supply port 40a can be sandwiched between the exhaust gas supply port 40a and the exhaust gas transfer path 12.

(Effect of the second embodiment)
According to the closed system flue gas treatment system 1a according to the second embodiment, the treated water discharged from the water treatment unit 18 and the exhaust gas discharged from the incineration ash treatment unit 20 are exhausted in the intermediate introduction unit 40. Since it merges with the gas and is collectively supplied to the suction port 14a of the ejector 14 via the intermediate introduction part 40, the radioactive substance can be sent into the water tank 16 more efficiently.

  While the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the claims. In addition, not all the combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

DESCRIPTION OF SYMBOLS 1, 1a Closed system flue gas treatment system 10 Combustion part 12 Exhaust gas transfer path 14 Ejector 14a Suction port 14b Water supply port 14c Discharge port 16 Water tank 18 Water treatment part 20 Incineration ash treatment part 30 Exhaust pump 32 Water pump 40 Intermediate introduction part 40a Exhaust gas supply port 40b Treated water supply port 40c Exhaust gas supply port 40d Outlet 160 Mixed liquid introduction part 162 Lid 164 Connection part 166 Mist filter 168 Treated water 180 Filter 182, 182a Pipe 200 Cyclone 210 Recovery container 220 Extruder 300, 300a tube

Claims (6)

A combustion section for discharging exhaust gas containing combustion gas and smoke generated along with combustion of waste material containing radioactive material and incineration ash generated by combustion of the waste material;
An exhaust gas transfer path through which the exhaust gas discharged from the combustion section is transferred;
A suction port through which the exhaust gas transferred through the exhaust gas transfer path is introduced, and water to be brought into contact with the exhaust gas are supplied to the inside at a flow rate faster than the flow rate at the introduction portion of the water. An ejector having a water supply port for generating pressure, and a discharge port from which a mixed liquid in which the exhaust gas and the water are mixed is discharged;
A wet tank that introduces the mixed liquid discharged from the discharge port into the water and mixes the mixed liquid and water, and a water tank for storing treated water in which the mixed liquid and the water are mixed;
A water treatment unit for separating the solid material resulting from the combustion gas and the smoke from the treated water, and supplying treated water from which the solid material has been removed to the ejector;
The incineration ash discharged from the combustion section is sucked, the incineration ash and the exhaust gas generated by the suction are separated, the incineration ash is recovered in a recovery container, and the exhaust gas is supplied to the suction port of the ejector A closed-system flue gas treatment system comprising an incineration ash treatment unit that is supplied toward the factory. The incineration ash treatment unit supplies the exhaust gas toward the suction port of the ejector via a tube at the rear stage of the incineration ash treatment unit,
Closed system flue gas treatment system according to claim 1 having pre Symbol aquarium, a lid covering the treated water, and a connecting portion for connecting the exterior of the internal and the water tank of the water tub. The incineration ash processing unit, a closed system flue gas treatment system according to claim 2, the inlet of the collecting container Rukoto closed by thermal bonding, vacuum packed the ash collected in the said collection container. Between the suction port of the ejector and the exhaust gas transfer path, the treated water supply port to which the treated water from the water treatment unit is supplied and the exhaust gas from the incineration ash treatment unit are supplied. An intermediate introduction part having an exhaust gas supply port to be supplied and an exhaust gas supply port to which the exhaust gas transferred from the exhaust gas transfer path is supplied,
The closed-system smoke treatment system according to claim 3, wherein the treated water, the exhaust gas, and the exhaust gas are supplied to the suction port from the intermediate introduction unit.   The closed system flue gas treatment system according to claim 4, wherein the connecting portion includes a mist filter that prevents fine particles from being discharged to the outside from the water tank. The closed-system smoke treatment system according to claim 5, wherein the incineration ash treatment unit separates the incineration ash and the exhaust gas with a cyclone.

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