CN111667937A - Steam reforming fixed bed reactor for treating radioactive waste - Google Patents
Steam reforming fixed bed reactor for treating radioactive waste Download PDFInfo
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- CN111667937A CN111667937A CN202010359555.0A CN202010359555A CN111667937A CN 111667937 A CN111667937 A CN 111667937A CN 202010359555 A CN202010359555 A CN 202010359555A CN 111667937 A CN111667937 A CN 111667937A
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- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
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Abstract
The invention discloses a steam reforming fixed bed reactor for treating radioactive waste, which comprises: the sampling tube is arranged at the connecting section of the main reaction chamber and the secondary reaction chamber; air inlet pipe and feeding system have been arranged to the casing top of main reaction room, and instrument tube and ash discharge system have been arranged to the casing below, and the inside screw rod that is equipped with transverse arrangement of main reaction room, the end cover has been arranged at the both ends of screw rod. The invention can realize the steam reforming treatment of radioactive wastes, such as ion exchange resin, plastic rubber and the like, and has better heat transfer and mass transfer capacities.
Description
Technical Field
The invention relates to the field of radioactive waste treatment, in particular to a steam reforming fixed bed reactor for treating radioactive waste.
Background
Sludge, waste oil, waste organic solvent and graphite generated by nuclear facilities, particularly radioactive wastes such as ion exchange resin, plastic rubber and the like are temporarily stored at present due to lack of proper treatment means, so that the safe treatment of the wastes is not facilitated; meanwhile, with the development of nuclear power industry, the problem of radioactive waste treatment and disposal is more and more prominent, and the research and development requirements for new waste treatment technologies are more and more urgent.
In order to achieve effective treatment of the radioactive waste, a new radioactive waste treatment technology, i.e., a steam reforming technology, has been developed in recent years abroad, in which the radioactive waste is brought into contact with superheated steam, so that organic components in the waste are cracked, denitrated and evaporated to become gaseous products, and radionuclides in the waste form a crystalline mineral structure with stable properties through a mineralization reaction. The main reaction temperature of the steam reforming technology is lower than that of incineration, combustion is avoided, high-efficiency volume reduction can be realized, and meanwhile, the tail gas product does not generate severe toxicants such as dioxin, the influence on the environment is small, the treatment is simple, and secondary waste is less, so that the radioactive waste such as ion exchange resin, plastic rubber and the like can be effectively treated. The radioactive waste steam reforming technology has been successfully used abroad, and the research in this respect in the united states is particularly intensive, and the developed THOR steam reforming technology is very mature and has been used for many years of engineering.
The american THOR steam reforming technology employs a fluidized bed reactor that provides high heat and mass transfer capacity, uniform bed temperature distribution, stable operation, good waste reaction conditions, but at the same time the fluidized bed is difficult to operate, the friction and wear within the equipment are severe, requiring subsequent collection and dust collection devices, and also has certain requirements for radioactive waste to be treated in order to achieve the fluidized conditions. However, if the fixed bed reactor is used as the main reactor for steam reforming of the radioactive waste, although the fixed bed reactor has the advantages of simple structure, convenient operation and the like and is widely and long-term applied in the field of radioactive waste heat treatment, the waste is relatively static in the reaction process due to the fixed bed form, the heat transfer and mass transfer capacity in the reactor is relatively poor, the temperature distribution is complex, local temperature difference can be generated, the full reaction of the waste is not facilitated, and the control of the operation parameters of the reactor is relatively strict. Therefore, the fixed bed reactor also has certain requirements on the type, quality, size and the like of the waste, and is not beneficial to meeting the treatment requirement of special radioactive waste and improving the treatment capacity of equipment. In view of the above problems, there is a need for an improved fixed bed reactor, which has a better treatment effect, so as to satisfy the steam reforming treatment requirements of radioactive wastes, such as ion exchange resins, plastic rubber, etc.
Disclosure of Invention
In view of the drawbacks of the prior art, it is an object of the present invention to provide a steam reforming fixed bed reactor for treating radioactive waste, which is capable of performing steam reforming treatment of the radioactive waste.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a steam reforming fixed bed reactor for treating radioactive waste, the steam reforming fixed bed reactor comprising: the device comprises a main reaction chamber, a secondary reaction chamber and a sampling tube, wherein the sampling tube is arranged at the connecting section of the main reaction chamber and the secondary reaction chamber;
an air inlet pipe and a feeding system are arranged above a shell of the main reaction chamber, an instrument pipe and an ash discharge system are arranged below the shell, a screw rod which is transversely arranged is arranged in the main reaction chamber, and end covers are arranged at two ends of the screw rod;
the feeding system is positioned at the front end of the main reaction chamber and comprises a hopper, a first feeding valve, a storage pipe, a second feeding valve and a feeding pipe which are sequentially connected from top to bottom, and the feeding pipe is communicated with the top inside the main reaction chamber;
the ash discharge system is positioned at the rear end of the main reaction chamber and comprises an ash discharge pipe, an ash discharge valve and an ash bucket which are sequentially connected from top to bottom, and the ash discharge pipe is communicated with the bottom inside the main reaction chamber;
the secondary reaction chamber is positioned above the rear end of the shell of the main reaction chamber, a baffle plate which is longitudinally arranged is arranged in the secondary reaction chamber, and an exhaust pipe is arranged above the shell.
Further, a steam reforming fixed bed reactor for treating radioactive waste as described above, said main reaction chamber being made of heat-resistant stainless steel and having a cylindrical structure; the main reaction chamber comprises all components which are integrated in a mode of flange bolts or open hole insert welding.
Further, a steam reforming fixed-bed reactor for treating radioactive waste as described above, said screw being made of heat-resistant stainless steel, being a mandrel-free screw belt, eccentrically disposed at the bottom of said main reaction chamber, for transporting and agitating the radioactive waste to be treated;
one end of the screw is connected with a motor, and the rotating speed of the screw is set through a frequency converter; the screw is provided with a reverse spiral above the ash discharge pipe;
the end covers arranged at two ends of the screw are made of heat-resistant stainless steel, bearings and sealing elements are arranged in the end covers, a water cooling jacket is arranged outside the end covers, and the end covers and the main reaction chamber form a whole through flange bolts.
Further, a steam reforming fixed bed reactor for treating radioactive wastes as described above, wherein said gas inlet pipe is a plurality of, and is uniformly arranged above the shell of said main reaction chamber and communicated to the interior of said main reaction chamber;
the air inlet pipe is made of heat-resistant stainless steel, is externally connected with a flange or is provided with threads and is used for being connected with a superheated steam production pipeline.
Further, a steam reforming fixed bed reactor for treating radioactive wastes as described above, said instrumentation tubes are plural, and are uniformly arranged below the shell of said main reaction chamber and communicated to the interior of said main reaction chamber;
the instrument tube is made of heat-resistant stainless steel, is externally connected with a flange or is provided with threads and is used for being connected with instruments and meters.
Further, a steam reforming fixed bed reactor for treating radioactive waste as described above, said feed system comprising components integrated by flange bolts or by means of insertion welding with openings;
the hopper is made of stainless steel, has a conical section structure and is used for storing and discharging radioactive wastes to be treated;
the first feeding valve and the second feeding valve are made of stainless steel and used for feeding the radioactive waste to be treated;
the storage pipe is made of stainless steel, is of a straight pipe-shaped structure and is used for temporary storage and metering of radioactive waste to be treated;
the feeding pipe is made of heat-resistant stainless steel and is of a straight pipe-shaped structure, and a water cooling jacket is arranged outside the feeding pipe.
Further, the steam reforming fixed bed reactor for treating the radioactive waste is characterized in that the ash discharge pipe and the ash discharge valve are integrated through flange bolts or welding;
the ash discharge valve and the ash bucket form a whole through a flange bolt;
the ash discharge pipe is made of heat-resistant stainless steel, is of a straight pipe-shaped structure and is used for temporarily storing residue ash;
the ash discharge valve is made of heat-resistant stainless steel and is used for discharging residue ash;
the ash bucket is made of heat-resistant stainless steel and is of a cylindrical structure and used for storing and collecting residue ash.
Further, the steam reforming fixed bed reactor for treating the radioactive wastes is characterized in that the secondary reaction chamber is made of heat-resistant stainless steel, has a cylindrical structure and is used for treating tail gas;
the secondary reaction chamber and the main reaction chamber form a whole in a flange bolt or open hole insert welding mode;
the baffle plate is made of heat-resistant stainless steel and is a non-full-circle plate, and the baffle plate and the shell in the side reaction chamber form a whole by welding;
the exhaust pipe is made of heat-resistant stainless steel, is integrated with the side reaction chamber shell in a flange bolt or hole plug welding mode, is externally connected with a flange or is provided with threads and is used for being connected with a rear-end tail gas treatment system.
Further, according to the steam reforming fixed bed reactor for treating radioactive wastes, the sampling/air inlet pipe is made of heat-resistant stainless steel and is of a straight pipe-shaped structure, and the sampling/air inlet pipe and the connecting section of the main reaction chamber and the secondary reaction chamber form a whole in a flange bolt or open hole plug welding mode and is used for sampling and detecting tail gas.
Further, a steam reforming fixed bed reactor for treating radioactive waste as described above, said main reaction chamber having a plurality of legs disposed below the shell;
the shell of the main reaction chamber and the shell of the secondary reaction chamber are externally coated with heat insulation layers.
The invention has the beneficial effects that: the invention is provided with the screw rod, and the pushing and stirring functions of the screw rod are utilized to ensure that the steam reforming treatment process of the radioactive waste achieves higher heat transfer and mass transfer states, so that the reaction is more sufficient and thorough; the invention is provided with the air inlet pipe, and can realize the adjustment of the steam reforming process of the radioactive waste by controlling the position and the flow of the steam entering the equipment.
Drawings
Fig. 1 is a schematic structural view of a steam reforming fixed bed reactor for treating radioactive waste according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
As shown in fig. 1, a steam reforming fixed bed reactor for treating radioactive waste, the steam reforming fixed bed reactor comprising: a main reaction chamber 6 and a secondary reaction chamber 10;
the shell of the main reaction chamber 6 is provided with an air inlet pipe 8, an instrument pipe 18, a feeding system and an ash discharging system, a screw 7 is arranged in the shell, and two ends of the screw 7 are connected with an end cover 13; the feeding system consists of a hopper 1, a first feeding valve 2, a storage pipe 3, a second feeding valve 4 and a feeding pipe 5; the ash discharging system consists of an ash discharging pipe 14, an ash discharging valve 15 and an ash bucket 16.
A baffle plate 11 is arranged in the secondary reaction chamber 10, and an exhaust pipe 12 is arranged on the shell. The sampling tube 9 is arranged at the connecting section of the main reaction chamber 6 and the secondary reaction chamber 10.
The lower part of the equipment main body is provided with supporting legs 17 and an external heat-insulating layer 19.
(I) a main reaction chamber
The shell of the reaction chamber 6 is provided with an air inlet pipe 8, an instrument pipe 18, a feeding system and an ash discharging system, a screw 7 is arranged in the shell, and two ends of the screw 7 are connected with an end cover 13; the main reaction chamber 6 is made of heat-resistant stainless steel and has a cylindrical structure; the air inlet pipe 8, the instrument pipe 18, the feeding system and the ash discharge system are integrated through flange bolts, holes, insert welding and the like; the screw 7 is made of heat-resistant stainless steel, is a mandrel-free screw belt, is eccentrically arranged at the bottom of the main reaction chamber 6 and is used for conveying and stirring the radioactive waste to be treated; the end cover 13 is made of heat-resistant stainless steel, a bearing and a sealing element are arranged in the end cover to realize the supporting and sealing functions of the shaft end, and a water cooling jacket is arranged outside the end cover to prevent the shaft end from being overheated; and can be disassembled by flange bolts to form a whole with the main reaction chamber 6; the air inlet pipe 8 is made of heat-resistant stainless steel, is externally connected with a flange or is provided with threads, and can be connected with a superheated steam production pipeline; the instrument tube 18 is made of heat-resistant stainless steel, is externally connected with a flange or is provided with threads, and can be connected with instruments.
The feeding system consists of a hopper 1, a feeding valve 12, a storage pipe 3, a feeding valve 24 and a feeding pipe 5; the hopper 1, the feeding valve 12, the storage pipe 3, the feeding valve 24 and the feeding pipe 5 form a whole in a flange bolt, welding and other modes; the hopper 1 is made of stainless steel and has a conical section structure, so that waste is convenient to store and discharge; the feeding valve 12 and the feeding valve 24 are made of stainless steel, and can adopt a ball valve and other available forms for feeding waste; the material storage pipe 3 is made of stainless steel, is of a straight pipe-shaped structure and is used for temporary storage and metering of radioactive waste to be treated; the feeding pipe 5 is made of heat-resistant stainless steel and is of a straight pipe-shaped structure, and a water-cooling jacket is arranged outside the straight pipe-shaped structure to prevent waste from melting and blocking a feeding channel.
The ash discharging system consists of an ash discharging pipe 14, an ash discharging valve 15 and an ash bucket 16; the ash discharge pipe 14 and the ash discharge valve 15 form a whole by means of flange bolts, welding and the like; the ash discharge valve 15 and the ash bucket 16 form a whole in a detachable mode such as a flange bolt; the ash discharge pipe 14 is made of heat-resistant stainless steel, has a straight pipe-shaped structure and is used for temporarily storing residue ash; the ash discharge valve 15 is made of heat-resistant stainless steel, and can be in a ball valve or other available forms and is used for discharging residue ash; the ash hopper 16 is made of heat-resistant stainless steel and has a cylindrical structure for storing and collecting the residue ash.
(II) side reaction chamber
A baffle plate 11 is arranged in the secondary reaction chamber 10, and an exhaust pipe 12 is arranged on the shell; the secondary reaction chamber 10 is made of heat-resistant stainless steel, has a cylindrical structure and is used for treating tail gas; the auxiliary reaction chamber 10 and the main reaction chamber 6 form a whole body through flange bolts, open holes, insert welding and other modes; the baffle plate 11 is made of heat-resistant stainless steel, is a non-integral circular plate and is integrated with the inner shell of the secondary reaction chamber 10 by welding and the like; the exhaust pipe 12 is made of heat-resistant stainless steel, and is integrated with the shell of the secondary reaction chamber 10 through flange bolts, perforated insert welding and other modes, and meanwhile, the exhaust pipe 12 is externally connected with a flange or is provided with threads and can be connected with a rear-end tail gas treatment system;
(III) sampling tube
The sampling tube (9) is made of heat-resistant stainless steel, is of a straight tube structure, is integrated with the connecting section of the main reaction chamber (6) and the auxiliary reaction chamber (10) in a flange bolt mode, a hole-opening insert welding mode and the like, and is used for sampling and detecting tail gas.
The supporting legs (17) are made of structural steel, and are integrated with the shell of the main reaction chamber (6) in a welding mode and the like, so that the supporting legs are used for supporting and fixing the whole reactor. The heat-insulating layer (19) is made of a commercially available heat-insulating material, such as an aluminum silicate fiber felt and the like, is externally applied to the whole reactor shell, has a certain thickness, and can prevent excessive heat loss of equipment and scalding during operation of personnel.
The working principle is as follows:
before radioactive wastes such as ion exchange resin, plastic rubber and the like are treated, the reaction temperature required by the steam reforming treatment of the radioactive wastes can be reached by available modes such as steam preheating, external electric heaters and the like. The radioactive wastes, such as ion exchange resins, plastic rubbers, etc., are temporarily stored in the hopper 1, and if the steam reforming process requires additional additives, they may be uniformly mixed with the radioactive wastes to be treated and then placed in the hopper 1. When feeding is required, the first feeding valve 2 is manually opened, and the radioactive waste to be treated is conveyed into the storage pipe 3 under the action of gravity. The amount of waste fed can be calculated from the opening time of the first feed valve 2 and the size of the storage pipe 3. Thereafter, the first feeding valve 2 is closed and the second feeding valve 4 is opened, and the radioactive waste to be treated is introduced into the front end of the main reaction chamber 6 through the feeding pipe 5. Wherein, the feed pipe 5 is externally provided with a water cooling jacket which can prevent the waste from melting and blocking the feed channel. The feeding system adopts a double-valve system, and one valve is always kept in a closed state, so that the reactor can be ensured not to be communicated with the external environment.
After the radioactive waste to be treated enters the front end of the main reaction chamber 6, the waste can be fully stirred and mixed while being pushed forward under the action of the screw 7, so that the treatment process achieves a high heat transfer and mass transfer state. The screw 7 is eccentrically arranged at the bottom of the main reaction chamber 6, on the one hand, to reserve space above for the gases generated by the steam reforming reaction of the waste, and on the other hand, to make it easier for the screw 7 to contact the waste located at the bottom of the main reaction chamber 6. Meanwhile, end covers 13 are arranged at two ends of the screw 7, bearings and sealing elements are arranged in the end covers, so that the supporting and sealing functions of the shaft end are realized, and meanwhile, a water cooling jacket is arranged outside the end covers 13 to prevent the shaft end from being overheated. One end of the screw 7 is connected with a motor for providing power for the screw, and the rotating speed of the screw 7 is set through a frequency converter, so that the retention time of the radioactive waste to be treated in the reactor is controlled, and finally a better treatment state is achieved.
At the same time, the superheated steam enters the main reaction chamber 6 at a certain flow rate through a plurality of inlet pipes 8 arranged on the shell of the main reaction chamber 6. Under the action of the screw 7, the radioactive waste to be treated advances while being stirred and mixed, and is fully and uniformly contacted with the superheated steam entering the main reaction chamber 6, so that the reaction is more full and thorough. Furthermore, monitoring of reaction conditions, such as temperature, pressure, etc., can be achieved by a plurality of instrumentation tubes 18 disposed on the housing of the main reaction chamber 6.
As the reaction proceeds, the radioactive waste to be treated is transported by the screw 7 from the front end to the rear end of the main reaction chamber 6, while the waste is gradually decomposed into possible residual ashes and off-gases. Wherein, the residue ash enters the ash discharge pipe 14 under the action of gravity, after the storage reaches a certain degree, the ash discharge valve 15 is manually opened, the residue ash falls into the ash hopper 16, and finally proper collection and treatment are obtained. At the same time, the screw 7 is also provided with a reverse spiral above the ash discharge pipe 14 to prevent the residual ash from entering the dead space at the rear end of the main reaction chamber 6 and being difficult to discharge.
And tail gas generated by the reaction of the waste enters the secondary reaction chamber 10 through the connecting section between the main reaction chamber 6 and the secondary reaction chamber 10 and is further treated. A sampling pipe 9 arranged in the connecting section of the main reaction chamber 6 and the secondary reaction chamber 10 can be used for sampling and detecting the tail gas. The secondary reaction chamber 10 is provided with a baffle plate 11, which can enhance the gas flowing state in the space and can be used for placing possible catalysts and the like. After the reaction of the tail gas in the side reaction chamber 10 is completed, the tail gas is discharged through the exhaust pipe 12, and then is connected with an available tail gas treatment system, so that the tail gas is properly collected or exhausted.
The whole equipment shell is also provided with a plurality of supporting legs 17 for supporting and fixing the whole reactor, and the outer coating heat-insulating layer 19 is used for preventing the excessive heat loss of the equipment and the scalding of personnel during operation.
The invention provides a steam reforming fixed bed reactor for treating radioactive wastes, which has the following advantages:
1. the device is internally provided with a screw, and the pushing and stirring functions of the screw are utilized to ensure that the steam reforming treatment process of the radioactive waste achieves higher heat transfer and mass transfer states, so that the reaction is more sufficient and thorough;
2. the apparatus is provided with a plurality of gas inlets, and regulation of the radioactive waste steam reforming process can be achieved by controlling the position and flow of steam entering the apparatus.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.
Claims (10)
1. A steam reforming fixed bed reactor for treating radioactive waste, the steam reforming fixed bed reactor comprising: a main reaction chamber (6) and a secondary reaction chamber (10), and a sampling tube (9) arranged at the connection section of the main reaction chamber (6) and the secondary reaction chamber (10);
an air inlet pipe (8) and a feeding system are arranged above a shell of the main reaction chamber (6), an instrument pipe (18) and an ash discharge system are arranged below the shell, a screw rod (7) which is transversely arranged is arranged in the main reaction chamber (6), and end covers (13) are arranged at two ends of the screw rod (7);
the feeding system is positioned at the front end of the main reaction chamber (6) and comprises a hopper (1), a first feeding valve (2), a storage pipe (3), a second feeding valve (4) and a feeding pipe (5) which are sequentially connected from top to bottom, and the feeding pipe (5) is communicated with the top inside the main reaction chamber (6);
the ash discharge system is positioned at the rear end of the main reaction chamber (6) and comprises an ash discharge pipe (14), an ash discharge valve (15) and an ash bucket (16) which are sequentially connected from top to bottom, and the ash discharge pipe (14) is communicated with the bottom inside the main reaction chamber (6);
the secondary reaction chamber (10) is positioned above the rear end of the shell of the main reaction chamber (6), a baffle plate (11) which is longitudinally arranged is arranged in the secondary reaction chamber, and an exhaust pipe (12) is arranged above the shell.
2. A steam reforming fixed bed reactor for the treatment of radioactive waste, as defined in claim 1, wherein said main reaction chamber (6) is made of heat resistant stainless steel, having a cylindrical structure; the main reaction chamber (6) comprises all components which are integrated in a mode of flange bolts or open-hole insert welding.
3. A steam reforming fixed bed reactor for the treatment of radioactive waste, according to claim 1, characterized in that said screws (7) are made of heat-resistant stainless steel, are mandrel-free screws, are eccentrically arranged at the bottom of said main reaction chamber (6), and are used for conveying and agitating the radioactive waste to be treated;
one end of the screw rod (7) is connected with a motor, and the rotating speed of the screw rod (7) is set through a frequency converter; a reverse spiral is arranged above the ash discharge pipe (14) by the screw (7);
the end covers (13) arranged at two ends of the screw rod (7) are made of heat-resistant stainless steel, bearings and sealing elements are arranged in the end covers, a water cooling jacket is arranged outside the end covers, and the end covers (13) and the main reaction chamber (6) form a whole through flange bolts.
4. A steam reforming fixed bed reactor for treating radioactive waste as defined in claim 1, wherein said inlet pipe (8) is a plurality of pipes uniformly arranged above the shell of said main reaction chamber (6) and connected to the inside of said main reaction chamber (6);
the air inlet pipe (8) is made of heat-resistant stainless steel, is externally connected with a flange or is provided with threads and is used for being connected with a superheated steam production pipeline.
5. A steam reforming fixed bed reactor for treating radioactive waste as claimed in claim 1, wherein said instrumentation tubes (18) are plural, uniformly arranged below the shell of said main reaction chamber (6) and connected to the inside of said main reaction chamber (6);
the instrument tube (18) is made of heat-resistant stainless steel, is externally connected with a flange or is provided with threads and is used for being connected with instruments and meters.
6. The steam reforming fixed bed reactor for treating radioactive waste of claim 1, wherein said feed system comprises components that are integrally formed by flange bolts or by insert welding with openings;
the hopper (1) is made of stainless steel, has a conical section structure and is used for storing and discharging radioactive wastes to be treated;
the first feeding valve (2) and the second feeding valve (4) are made of stainless steel and used for feeding the radioactive waste to be treated;
the storage pipe (3) is made of stainless steel, is of a straight pipe-shaped structure and is used for temporary storage and metering of radioactive waste to be treated;
the feeding pipe (5) is made of heat-resistant stainless steel and is of a straight pipe-shaped structure, and a water cooling jacket is arranged outside the straight pipe-shaped structure.
7. A steam reforming fixed bed reactor for treating radioactive waste as claimed in claim 1, wherein said ash discharge pipe (14) is integrated with said ash discharge valve (15) by means of flange bolts or welding;
the ash discharge valve (15) and the ash bucket (16) form a whole through a flange bolt;
the ash discharge pipe (14) is made of heat-resistant stainless steel, is of a straight pipe structure and is used for temporarily storing residue ash;
the ash discharge valve (15) is made of heat-resistant stainless steel and is used for discharging residue ash;
the ash bucket (16) is made of heat-resistant stainless steel and is of a cylindrical structure and used for storing and collecting residue ash.
8. A steam reforming fixed bed reactor for the treatment of radioactive waste, as claimed in claim 1, wherein said secondary reaction chamber (10) is made of heat-resistant stainless steel, having a cylindrical structure, for the treatment of off-gases;
the secondary reaction chamber (10) and the main reaction chamber (6) form a whole in a flange bolt or open-hole plug welding mode;
the baffle plate (11) is made of heat-resistant stainless steel, is a non-full-circle plate and is welded with the inner shell of the secondary reaction chamber (10) to form a whole;
the exhaust pipe (12) is made of heat-resistant stainless steel, and is integrated with the shell of the secondary reaction chamber (10) in a flange bolt or hole plug welding mode, and is externally connected with a flange or provided with threads and used for being connected with a rear-end tail gas treatment system.
9. The steam reforming fixed bed reactor for treating radioactive wastes according to claim 1, wherein the sampling/gas inlet pipe (9) is made of heat-resistant stainless steel, has a straight pipe-shaped structure, and is integrated with the connection section of the main reaction chamber (6) and the secondary reaction chamber (10) by means of flange bolts or open-hole insert welding for sampling and detecting the tail gas.
10. A steam reforming fixed bed reactor for treating radioactive waste as claimed in any one of claims 1 to 9, wherein a plurality of legs (17) are arranged below the shell of the main reaction chamber (6);
the shells of the main reaction chamber (6) and the secondary reaction chamber (10) are externally coated with an insulating layer (19).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113264655A (en) * | 2021-04-08 | 2021-08-17 | 中国辐射防护研究院 | Drying device for treating radioactive sludge |
| CN113294788A (en) * | 2021-04-08 | 2021-08-24 | 中国辐射防护研究院 | Thermal cracking device for treating radioactive solid waste |
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