CN114643021A - Preparation UO of uranyl nitrate through airflow type atomization drying pyrolysis denitration3In a device - Google Patents
Preparation UO of uranyl nitrate through airflow type atomization drying pyrolysis denitration3In a device Download PDFInfo
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- CN114643021A CN114643021A CN202011509744.8A CN202011509744A CN114643021A CN 114643021 A CN114643021 A CN 114643021A CN 202011509744 A CN202011509744 A CN 202011509744A CN 114643021 A CN114643021 A CN 114643021A
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- 229910002007 uranyl nitrate Inorganic materials 0.000 title claims abstract description 46
- 238000000197 pyrolysis Methods 0.000 title claims abstract description 20
- 238000000889 atomisation Methods 0.000 title claims abstract description 17
- 238000001035 drying Methods 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title claims description 7
- 238000006243 chemical reaction Methods 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 230000000694 effects Effects 0.000 claims abstract description 15
- 239000000498 cooling water Substances 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims description 24
- 230000018044 dehydration Effects 0.000 claims description 7
- 238000006297 dehydration reaction Methods 0.000 claims description 7
- 239000000428 dust Substances 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- 239000013078 crystal Substances 0.000 claims description 6
- 238000001704 evaporation Methods 0.000 claims description 6
- 230000008020 evaporation Effects 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 230000008676 import Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims 1
- 229910017604 nitric acid Inorganic materials 0.000 claims 1
- 229910052770 Uranium Inorganic materials 0.000 abstract description 15
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 14
- 238000000746 purification Methods 0.000 abstract description 14
- 239000002699 waste material Substances 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 26
- 239000000047 product Substances 0.000 description 15
- JCMLRUNDSXARRW-UHFFFAOYSA-N trioxouranium Chemical compound O=[U](=O)=O JCMLRUNDSXARRW-UHFFFAOYSA-N 0.000 description 14
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 238000012423 maintenance Methods 0.000 description 5
- 239000003345 natural gas Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 210000002445 nipple Anatomy 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000007795 chemical reaction product Substances 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000001994 activation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J6/00—Heat treatments such as Calcining; Fusing ; Pyrolysis
- B01J6/008—Pyrolysis reactions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/16—Evaporating by spraying
- B01D1/18—Evaporating by spraying to obtain dry solids
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G43/00—Compounds of uranium
- C01G43/01—Oxides; Hydroxides
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The invention belongs to the technical field of uranium purification, and particularly relates to a method for preparing UO by uranyl nitrate through airflow type atomization, drying, pyrolysis and denitration3The apparatus of (1). The upper part of the hot air distributor is cylindrical, a hot air inlet is arranged on the cylindrical shape, an opening is formed in the upper part of the cylindrical shape, a feeding nozzle mounting flange is arranged at the opening, the lower part of the hot air distributor is conical, a hot air outlet is formed in the lower conical part, and guide plates are uniformly distributed around the hot air outlet; the lower part of the hot air distributor is connected with the upper part of the reactor main body through a short section; the feeding device is formed by connecting a uranyl nitrate solution inlet, a central pipe and a nozzle from top to bottom, the feeding device penetrates into the feeding device from an upper opening of the hot air distributor, the nozzle extends out of a hot air outlet, and the uranyl nitrate solution inlet is positioned outside the upper opening of the hot air distributor; a cooling water jacket is arranged outside the feeding device,the hot water inlet and the hot water outlet are respectively arranged between the feeding device and the cooling water jacket. The invention improves the reaction activity of the product, reduces the waste generation amount and reduces the uranium purification production cost.
Description
Technical Field
The invention belongs to the technical field of uranium purification, and particularly relates to a method for preparing UO by uranyl nitrate through airflow type atomization, drying, pyrolysis and denitration3The apparatus of (1).
Background
The denitrator used for the denitration of the uranyl nitrate solution is of a continuous type or an intermittent type. The first used denitrators were batch-type denitrators, such as pot-type denitrators, and so far, a few plants were used. However, the reactor has the defects of incapability of continuous production, unstable product quality, low production capacity, high equipment maintenance cost, high radiation protection difficulty and the like, and is basically replaced by a continuous denitrator.
The horizontal groove type stirring denitrator and the fluidized bed denitrator are both continuous type denitrators. Compared with the tank-type denitrator, the horizontal tank-type stirring denitrator has the advantage of continuous production, but has no obvious improvement in aspects of heat transfer, equipment maintenance, radiation protection and the like.
In the UNH denitration process, the development of denitration equipment and denitration technology is promoted to a great extent by the application of the fluidization technology. In 1954, the U.S. first started the research of the fluidized bed denitration technology and was successively verified in a pilot plant and an industrial scale fluidized bed denitration system. The test result shows that: the fluidized bed denitration reactor has the advantages of good mass and heat transfer effect, simple structure, large production capacity of a single set of equipment, easiness in centralized control and the like, but still has the problems of high operation difficulty, high requirement, low product activity and the like.
In order to develop the natural uranium purification process in China, in 2015, a uranium purification and conversion production line is built by four limited companies of Zhonghuan-four 0, a uranium purification system is used for preparing uranium trioxide, a denitration fluidized bed is used as a heating facility, and in the production and operation process, the denitration fluidized bed has the defects of small specific surface area of products, easiness in damage of heating elements, large equipment maintenance workload, high difficulty, high requirement on stability of convection gas, large tail gas treatment capacity, high feeding pressure, large load of a feeding pump, high failure rate and the like, and continuous and stable operation of the uranium purification and conversion production line is influenced to a certain extent.
In order to perfect the uranium purification technical system in China, develop a novel uranium purification process device, improve the activity of the product after the uranyl nitrate denitration, and develop the preparation of high-activity UO by the uranyl nitrate solution denitration3Compared with the fluidized bed denitration and tank denitration technology, the device has the UO with small waste generation amount and output3Has high reactivity (with UO prepared by ADU method)3Chemical reactivity is equivalent), and the like.
Disclosure of Invention
The invention aims to provide a method for preparing UO by uranyl nitrate airflow type atomization drying pyrolysis denitration3The device is used for the uranyl nitrate pyrolysis denitration process to prepare UO with larger specific surface area3The method improves the reaction activity of the product, shortens the uranium purification process route, reduces the waste generation amount and reduces the uranium purification production cost.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
preparation UO of uranyl nitrate through airflow type atomization drying pyrolysis denitration3The upper part of the hot air distributor is cylindrical, a hot air inlet is arranged on the cylindrical shape, an opening is arranged on the upper part of the cylindrical shape, and a feeding nozzle is arranged at the openingInstalling a flange, wherein the lower part of the hot air distributor is conical, the conical lower part is provided with a hot air outlet, and guide plates are uniformly distributed around the hot air outlet; the lower part of the hot air distributor is connected with the upper part of the reactor main body through a short section; the feeding device is formed by connecting a uranyl nitrate solution inlet, a central pipe and a nozzle from top to bottom, the feeding device penetrates into the feeding device from an upper opening of the hot air distributor, the nozzle extends out of a hot air outlet, and the uranyl nitrate solution inlet is positioned outside the upper opening of the hot air distributor; a cooling water jacket is arranged outside the feeding device, and a hot water inlet and a hot water outlet are respectively arranged between the feeding device and the cooling water jacket and are positioned at the upper opening of the hot air distributor; the upper part of the reactor main body is cylindrical, the lower part of the reactor main body is conical, a tail gas outlet is arranged on the cylindrical shape, and a UO is arranged on the conical lower part3The material outlet, the upper part and the middle part of the cylinder are respectively provided with a viewing window A and a viewing window B.
The feed liquid pressurized by the metering pump is atomized into small fog drops by high-speed hot air flow through the feeding device and then enters the reactor main body, high-temperature high-speed air flow enters the reactor tangentially from the hot air distributor, and the small fog drops realize evaporation of free water and dehydration of crystal water under the action of high-speed high-temperature vortex air flow in the reactor and complete denitration reaction; under certain pressure and temperature in the reactor main body, the denitration reaction is continued until the denitration reaction is completely finished; denitration product UO3Most of solid particles settle at the bottom of the reactor main body, the solid particles are discharged into a product container through a rotary valve, a small part of mixed gas consisting of products and reaction tail gas enters a cyclone separator and a tubular dust remover, the materials are collected in the container after secondary dust removal, and the tail gas after dust removal is sent to a tail gas treatment device for treatment.
The device is made of 310S stainless steel.
Uranyl nitrate solution with certain pressure gets into feedway from uranyl nitrate solution import, gets into the reactor main part through the nozzle in, high temperature, certain pressure's hot-blast distributor that gets into from hot-blast import, be high-speed vortex air current after the guide plate effect, thoroughly atomizing the material of carrying to the nozzle, realize fast that the evaporation of free water and the taking off of crystal water to accomplish the pyrolysis denitration reaction, make the denitration reaction advance the feedwayComplete, final denitration product UO3The solid powder settles in the reactor body through the UO3Discharging the material from a material outlet; and tail gas generated by the reaction is conveyed to a subsequent tail gas treatment device through a tail gas outlet to be subjected to material recovery treatment.
Hot water enters from the hot water inlet, and flows out from the hot water outlet to cool the feeding device.
The beneficial effects obtained by the invention are as follows:
the invention designs a dry denitration reactor as main equipment for the thermal decomposition denitration of uranyl nitrate, and takes high-temperature and high-speed gas generated by burning natural gas and excess air as a reaction heat source and an atomization gas source to dry, dehydrate and thermally decompose and denitrate uranyl nitrate feed liquid. The process equipment comprises: short process flow, simple equipment structure, no internal component, no heating element in the equipment, large storage capacity of reaction products, difficult blockage of a feeding nozzle, convenient maintenance and overhaul of the equipment, stable operation and prepared UO3Uniform particle size distribution, good chemical reaction activity and the like. The concrete characteristics are as follows:
1) the equipment realizes the preparation of high-activity UO by uranyl nitrate airflow type atomization drying pyrolysis denitration3Process for preparing a highly active UO3Can be directly used in the subsequent hydrogen reduction process, thereby eliminating the original UO3The hydration and activation process shortens the process flow.
2) The equipment is provided with a uranyl nitrate solution feeding device and a hot air distribution device, so that the rapid dehydration and denitration reaction of the uranyl nitrate solution is realized, and the reaction generates high-activity UO3。
3) The feed pipeline in the hot air distributor of the equipment is provided with the hot water cooling device, so that the crystallization or advanced denitration of materials before entering the nozzle can be avoided, the blockage of the feed pipeline and the nozzle is prevented, and the continuous and stable operation of the equipment is ensured.
4) The equipment is provided with an observation port, and test or process conditions can be adjusted in time according to observation conditions to ensure normal reaction.
5) The short section is arranged between the hot air distributor and the reactor, the position of the feeding nozzle in the reactor can be changed according to the test result, and the total height of the equipment is adjusted.
6) Equipment structure is simple, and the denitration reactor compares with traditional UNH internal heating formula denitration fluidized bed, and this denitration reactor is inside does not have other parts, the process control and the maintenance of being convenient for.
7) Has obvious economic benefit. The UO with uniform granularity and high activity can be prepared by the equipment3The production line process flow is shortened, the production cost is saved, high-temperature gas generated by natural gas combustion can be used as a reaction heat source and an atomizing gas source, and compared with a traditional denitration fluidized bed, the denitration fluidized bed is free of an atomizing device and a fluidizing device, auxiliary equipment is reduced, and the operation is simpler and more convenient. The natural gas is burnt for heat supply, compares traditional electric heating, and the heat source is more stable, more energy saving, and the natural gas has promoted energy saving, the cost reduction of uranium purification production technology and has increased as a high-efficient clean energy, its utilization.
8) The high-activity UO is firstly realized in China by the equipment3The preparation of (3) to perfecting uranium purification production technology system, promoting uranium purification production technology level has important meaning, provides certain reference and reference to the development of the uranium atomization drying technology key equipment after piling simultaneously.
Drawings
FIG. 1: the overall structure schematic diagram of the uranyl nitrate pyrolysis denitration equipment;
FIG. 2 is a drawing: the structure schematic diagram of the feeding device;
FIG. 3: the structure schematic diagram of the hot air distributor;
FIG. 4 is a drawing: a schematic diagram of a cooling water jacket structure;
FIG. 5: a short section structure schematic diagram;
FIG. 6: the overall structure of the equipment is schematic after the short section is removed.
In the figure: 1-reactor main body, 2-short section, 3-hot air distributor, 4-cooling water jacket, 5-feeding device, 6-hot water inlet, 7-uranyl nitrate solution inlet, 8-hot water outlet, 9-tail gas outlet and 10-UO3Material outlet, 11-viewing window A, 12-viewing window B, 13-hot air inlet, 14-temp. measuring point1, 15-temperature measuring points 2, 16-temperature measuring points 3, 17-feeding nozzle mounting flanges, 18-hot air outlets; 19-a deflector.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Connection relationship between the constituent elements of the present invention: the upper part of the hot air distributor 3 is cylindrical, a hot air inlet 13 is arranged on the cylindrical part, an opening is arranged on the upper part of the cylindrical part, a feeding nozzle mounting flange 17 is arranged at the opening, the lower part of the hot air distributor 3 is conical, a hot air outlet 18 is arranged at the lower part of the conical part, guide plates 19 are evenly distributed around the hot air outlet 18, the lower part of the hot air distributor 3 is connected with the upper part of the reactor main body 1 through a short section 2, a feeding device 5 is formed by connecting a uranyl nitrate solution inlet 7, a central pipe and a nozzle from top to bottom, the feeding device 5 extends into the hot air distributor 3 from the opening on the upper part, the nozzle extends out of a hot air outlet 18, a uranyl nitrate solution inlet 7 is positioned outside an upper opening of the hot air distributor 3, a cooling water jacket 4 is arranged outside the feeding device 5, and a hot water inlet 6 and a hot water outlet 8 are respectively arranged between the feeding device 5 and the cooling water jacket 4 and positioned at the upper opening of the hot air distributor 3; the upper part of the reactor main body 1 is cylindrical, the lower part is conical, a tail gas outlet 9 is arranged on the cylindrical part, and a UO is arranged on the conical lower part3The material outlet 10, the cylindrical upper part and the cylindrical middle part are respectively provided with a viewing window A11 and a viewing window B12.
The feed liquid pressurized by the metering pump is atomized into small fog drops by high-speed hot air flow through a central pipe and a nozzle in the feeding device and then enters the reactor main body 1, high-temperature high-speed air flow enters from a hot air distributor in a tangential direction, and the small fog drops realize evaporation of free water and dehydration of crystal water under the action of high-speed high-temperature vortex air flow in the reactor and complete denitration reaction. The denitration reaction is continued under a certain pressure and temperature inside the reactor main body 1 until the denitration reaction is completely completed. Denitration product UO3The solid particles settle mostly at the bottom of the reactor body 1 and are discharged into the product container through a rotary valve. The mixed gas formed from small portion of product and reaction tail gas is fed into cyclone separator and tubular dust-collector, after secondary dust-removing the material is basically collected in the container, and after the material is removedAnd conveying the tail gas after dust collection to a tail gas treatment device for treatment.
According to the requirements of the UNH airflow type atomization drying pyrolysis denitration process, the development work of equipment is carried out from the following aspects, and the functions of the prepared drying denitration reactor are as follows:
(1) and selecting equipment materials. 310S stainless steel with better comprehensive performance is selected as the material of the equipment.
(2) And (4) designing the structure of the equipment. The overall structure schematic diagram of the uranyl nitrate pyrolysis denitration device (drying denitration reactor) is shown in the attached drawing 1, and the uranyl nitrate pyrolysis denitration device mainly comprises a reactor main body 1, a short section 2, a hot air distributor 3, a cooling water jacket 4, a feeding device 5 and the like. Uranyl nitrate solution with certain pressure gets into feedway 5 from uranyl nitrate solution import 7, gets into reactor main part 1 through the nozzle in, high temperature, certain pressure's hot-blast 3 (tangential entering) that gets into from hot-blast import 13, is high-speed vortex air current after the effect of guide plate 19, will carry the thorough atomizing of material to the nozzle, realize fast that the evaporation of free water and the taking off of crystal water to accomplish the pyrolysis denitration reaction. The denitration reaction is completed under the condition of controlling the internal pressure and the lower temperature of the denitration reactor. Finally produced denitration product UO3The solid powder settles in the reactor body through the UO3The material outlet 10 discharges. And tail gas generated by the reaction is conveyed to a subsequent tail gas treatment device through a tail gas outlet 9 for material recovery treatment. The upper part and the middle part of the reactor main body are provided with a viewing window A11 and a viewing window B12, so that the uranyl nitrate atomization effect, the reaction condition and the material condition can be observed conveniently. The periphery of the feeding device 5 is provided with a cooling water jacket 4, hot water enters from a hot water inlet 6, and flows out from a hot water outlet 8 to cool the feeding device 5 and the nozzle, so that the blockage of a feeding pipeline, the nozzle and the like is prevented, and the normal operation of equipment is ensured. Meanwhile, a short section 2 is arranged between the hot air distributor 3 and the equipment main body.
(3) Main part of dry denitration reactor
a) The apparatus has a uranyl nitrate solution feed 5 as shown in FIG. 2. The uranyl nitrate solution is conveyed into a feeding device through a metering pump and enters a denitration reactor after being atomized by a nozzle of the feeding deviceThe reactor atomizes the uranyl nitrate solution into uniform and fine liquid drops, and provides conditions for rapid and uniform denitration of uranyl nitrate. The size of atomized liquid drops can be changed by changing the feeding flow, pressure, hot air flow and pressure, so that the reaction product UO is changed3The particle size of (1).
b) As shown in fig. 3, the apparatus is provided with a hot air distributor 3. After the high-temperature gas generated by burning natural gas and excess air enters the hot air distributor 3 from the hot air inlet 13, high-temperature high-speed vortex gas is generated under the action of the guide plate 19, uranyl nitrate at the nozzle of the feeding device 5 is thoroughly atomized into small droplets, and the rapid dehydration and denitration reaction is realized. Due to the special structure of the hot air distributor, negative pressure is locally generated by high-speed vortex gas, the dehydration and denitration reaction of the uranyl nitrate solution is accelerated, the dehydration and denitration reaction of the uranyl nitrate solution is instantly finished, and the product UO is obtained3Has larger specific surface area, improves the UO product3Activity of (2).
c) The apparatus is provided with a cooling water jacket 4. Hot water enters the cooling jacket 4 from the hot water inlet 6 and flows out from the hot water outlet 8, so that the feeding device 5 and the hot air distributor 3 are cooled, and crystallization or denitration of the uranyl nitrate solution at other positions such as a pipeline before atomization is prevented as shown in figure 4.
d) This equipment is equipped with nipple joint 2, can be according to experimental and technology demand, adjusts the height of hot-blast distribution device and reactor main part 1 at any time, adjusts the position of feed arrangement nozzle in dry denitration reactor, and the nipple joint 2 structure is as shown in figure 5, and the overall structure schematic diagram of equipment after removing the nipple joint is as shown in figure 6.
Claims (5)
1. Preparation UO of uranyl nitrate through airflow type atomization drying pyrolysis denitration3The device of (2), characterized in that: the upper part of the hot air distributor is cylindrical, a hot air inlet is arranged on the cylindrical shape, an opening is formed in the upper part of the cylindrical shape, a feeding nozzle mounting flange is arranged at the opening, the lower part of the hot air distributor is conical, a hot air outlet is formed in the lower conical part, and guide plates are uniformly distributed around the hot air outlet; the lower part of the hot air distributor is connected with the upper part of the reactor main body through a short section; the feeding device consists of nitric acid from top to bottomThe feeding device penetrates into the hot air distributor from an upper opening of the hot air distributor, the nozzle extends out of the hot air outlet, and the uranyl nitrate solution inlet is positioned outside the upper opening of the hot air distributor; a cooling water jacket is arranged outside the feeding device, and a hot water inlet and a hot water outlet are respectively arranged between the feeding device and the cooling water jacket and are positioned at the upper opening of the hot air distributor; the upper part of the reactor main body is cylindrical, the lower part of the reactor main body is conical, a tail gas outlet is arranged on the cylindrical shape, and a UO is arranged on the conical lower part3The material outlet, the upper part and the middle part of the cylinder are respectively provided with a viewing window A and a viewing window B.
2. Airflow atomization, drying, pyrolysis and denitration process for preparing UO of uranyl nitrate according to claim 13The device of (2), characterized in that: the feed liquid pressurized by the metering pump is atomized into small fog drops by high-speed hot air flow through the feeding device and then enters the reactor main body, high-temperature high-speed air flow enters the reactor tangentially from the hot air distributor, and the small fog drops realize evaporation of free water and dehydration of crystal water under the action of high-speed high-temperature vortex air flow in the reactor and complete denitration reaction; under certain pressure and temperature in the reactor main body, the denitration reaction is continued until the denitration reaction is completely finished; denitration product UO3Most of solid particles settle at the bottom of the reactor main body, are discharged into a product container through a rotary valve, a small part of mixed gas consisting of products and reaction tail gas enters a cyclone separator and a tubular dust collector, and is subjected to secondary dust removal, the materials are collected in the container, and the tail gas after dust removal is sent to a tail gas treatment device for treatment.
3. Airflow atomization, drying, pyrolysis and denitration process for preparing UO of uranyl nitrate according to claim 13The device of (2), characterized in that: the device is made of 310S stainless steel.
4. Airflow atomization, drying, pyrolysis and denitration process for preparing UO of uranyl nitrate according to claim 13The device of (2), characterized in that: the uranyl nitrate solution with certain pressure enters the feed from a uranyl nitrate solution inletThe material device gets into the reactor main part through the nozzle, and high temperature, certain pressure's hot-blast from hot-blast import entering hot-blast distributor is high-speed vortex air current after the guide plate effect, will carry to the thorough atomizing of material of nozzle, realizes fast that the evaporation of free water and the taking off of crystal water to accomplish the pyrolysis denitration reaction, make the denitration reaction go on completely, the denitration product UO that finally produces3The solid powder settles in the reactor body through the UO3Discharging the material from a material outlet; and tail gas generated by the reaction is conveyed to a subsequent tail gas treatment device through a tail gas outlet to be subjected to material recovery treatment.
5. Airflow atomization, drying, pyrolysis and denitration process for preparing UO of uranyl nitrate according to claim 13The device of (2), characterized in that: hot water enters from the hot water inlet, and flows out from the hot water outlet to cool the feeding device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011509744.8A CN114643021A (en) | 2020-12-18 | 2020-12-18 | Preparation UO of uranyl nitrate through airflow type atomization drying pyrolysis denitration3In a device |
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| CN202011509744.8A CN114643021A (en) | 2020-12-18 | 2020-12-18 | Preparation UO of uranyl nitrate through airflow type atomization drying pyrolysis denitration3In a device |
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