Uranium hexafluoride tail gas treatment system

Abstract

The invention discloses a uranium hexafluoride tail gas treatment system. The uranium hexafluoride tail gas treatment system comprises a leaching unit, a heating unit and a filtering unit, the leaching unit is communicated with the filtering unit through the heating unit; the leaching unit comprises a leaching tower; leacheate is arranged in the leaching tower; the leacheate comprises a sodium bicarbonate solution; the uranium hexafluoride tail gas reacts with a sodium bicarbonate solution in the leaching tower and then enters the heating unit for drying treatment; and the gas dried by the heating unit enters the filtering unit to be filtered. According to the uranium hexafluoride tail gas treatment system disclosed by the embodiment of the invention, filtering treatment on hydrogen fluoride gas and uranyl fluoride particles is realized.

Description

Technical Field

[0001] The invention relates to the technical field of tail gas filtration, in particular to a uranium hexafluoride tail gas treatment system. Background Art

[0002] Uranium hexafluoride tail gas mainly contains hydrogen fluoride gas, uranyl fluoride particles and uranium hexafluoride gas that may not have reacted completely. How to filter and treat the uranium hexafluoride tail gas to meet emission standards has become a technical problem that needs to be solved urgently in the industry. Summary of the invention

[0003] In order to at least solve the above technical problems, the object of the present invention is to provide a uranium hexafluoride tail gas treatment system, which realizes the filtering treatment of hydrogen fluoride gas and uranyl fluoride particles.

[0004] In order to achieve the above-mentioned purpose, the uranium hexafluoride tail gas treatment system provided in the present application comprises:

[0005] A rinsing unit, a heating unit and a filtering unit;

[0006] The elution unit is connected to the filtering unit through the heating unit;

[0007] The elution unit includes an elution tower;

[0008] The elution tower is provided with an elution liquid;

[0009] The eluent includes a sodium bicarbonate solution;

[0010] After reacting with the sodium bicarbonate solution in the leaching tower, the uranium hexafluoride tail gas enters the heating unit for drying;

[0011] The gas dried by the heating unit enters the filtering unit for filtering.

[0012] Furthermore, a tail gas input interface is provided at the lower part of the elution tower;

[0013] The uranium hexafluoride tail gas enters the leaching tower through the tail gas input interface;

[0014] The eluent in the eluent tower does not pass through the exhaust gas input interface.

[0015] Furthermore, the rinsing unit further includes:

[0016] Eluent circulation channel and eluent nozzle;

[0017] The elution nozzle is arranged in the elution tower, and the elution nozzle is arranged at the upper part of the elution tower;

[0018] The eluent circulation channel is connected with the eluent in the eluent tower and the eluent nozzle;

[0019] A circulation pump is provided on the eluent circulation channel;

[0020] The circulation pump transports the eluent in the elution tower to the elution nozzle, and the elution nozzle sprays the uranium hexafluoride tail gas entering the elution tower.

[0021] Furthermore, the elution nozzle is located above the elution liquid in the elution tower.

[0022] Further, the uranium hexafluoride tail gas, after reacting with the eluent, enters the heating unit;

[0023] The heating temperature of the heating unit is 60-100°C.

[0024] Furthermore, the filtration unit is used to filter the residual uranyl fluoride and hydrogen fluoride in the elution tower.

[0025] Furthermore, the mass proportion of sodium bicarbonate in the sodium bicarbonate solution is 8%.

[0026] Furthermore, the exhaust gas input interface is externally connected to an exhaust gas input channel;

[0027] A tail gas inlet control valve is provided on the tail gas input channel, and the tail gas inlet control valve is used to control the amount of uranium hexafluoride tail gas entering the elution tower to not exceed 100g / h.

[0028] Furthermore, the rinsing unit also includes:

[0029] A circulation tank, the circulation tank is connected with the eluent circulation channel;

[0030] When the sodium bicarbonate solution in the elution tower is lower than a threshold value, the circulation tank replenishes the sodium bicarbonate solution to the elution tower.

[0031] Furthermore, a medicine dispensing tank is provided in the circulation tank, and a stirring device is provided in the medicine dispensing tank;

[0032] The dispensing tank is used to prepare sodium bicarbonate solution.

[0033] The uranium hexafluoride tail gas treatment system of the embodiment of the present application includes: a leaching unit, a heating unit and a filtering unit; the leaching unit is connected to the filtering unit through the heating unit; the leaching unit includes a leaching tower; a leaching liquid is arranged in the leaching tower; the leaching liquid includes a sodium bicarbonate solution; the uranium hexafluoride tail gas enters the heating unit for drying treatment after reacting with the sodium bicarbonate solution in the leaching tower; the gas dried by the heating unit enters the filtering unit for filtering treatment. The uranium hexafluoride tail gas treatment system of the embodiment of the present application realizes the filtering treatment of hydrogen fluoride gas and uranyl fluoride particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings:

[0035] Figure 1 It is a schematic diagram of the structure of a uranium hexafluoride tail gas treatment system according to an embodiment of the present application.

[0036] Description of reference numerals:

[0037] 101-elution tower; 102-circulation tank; 103-elution nozzle; 104-heater; 105-filter; 106-fan; 107-chimney; 108-exhaust gas input channel; 109-waste liquid output channel; 110-elution liquid circulation channel. DETAILED DESCRIPTION

[0038] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present application. It should be understood that the drawings and embodiments of the present application are only for exemplary purposes and are not intended to limit the scope of protection of the present application.

[0039] It should be understood that the various steps described in the method implementation of the present application can be performed in different orders and / or performed in parallel. In addition, the method implementation may include additional steps and / or omit the steps shown. The scope of the present application is not limited in this respect.

[0040] The term "including" and its variations used herein are open inclusions, i.e., "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the following description.

[0041] It should be noted that the modifications of "one" and "plurality" mentioned in this application are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more". "Plurality" should be understood as two or more.

[0042] Embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0043] The present application provides a uranium hexafluoride tail gas treatment system, comprising:

[0044] A rinsing unit, a heating unit and a filtering unit;

[0045] The elution unit is connected to the filtering unit through the heating unit;

[0046] The elution unit includes an elution tower;

[0047] The elution tower is provided with an elution liquid;

[0048] The eluent includes a sodium bicarbonate solution;

[0049] After reacting with the sodium bicarbonate solution in the leaching tower, the uranium hexafluoride tail gas enters the heating unit for drying;

[0050] The gas dried by the heating unit enters the filtering unit for filtering.

[0051] Example 1

[0052] Figure 1 This is a schematic diagram of the structure of the uranium hexafluoride tail gas treatment system of the embodiment of the present application. Figure 1 , the uranium hexafluoride tail gas treatment system of the embodiment is described in detail.

[0053] In an exemplary embodiment, the uranium hexafluoride tail gas treatment system of the embodiment of the present application includes a leaching unit, a heating unit and a filtering unit.

[0054] In an exemplary embodiment, the elution unit is connected to the filtration unit via the heating unit.

[0055] In an exemplary embodiment, the elution unit includes an elution tower 101 .

[0056] In an exemplary embodiment, an eluent is provided in the eluent tower 101 .

[0057] In an exemplary embodiment, the eluent comprises a sodium bicarbonate solution.

[0058] In an exemplary embodiment, the mass percentage of sodium bicarbonate in the sodium bicarbonate solution is 8%.

[0059] In an exemplary embodiment, a tail gas input interface is provided at the lower portion of the elution tower 101. The tail gas input interface is provided, for example, at the lower side or bottom of the elution tower 101. Figure 1 shown.

[0060] In an exemplary embodiment, the exhaust gas input interface is externally connected to an exhaust gas input channel 108 .

[0061] In an exemplary embodiment, an exhaust gas inlet control valve is provided on the exhaust gas input passage 108 .

[0062] In an exemplary embodiment, the tail gas inlet control valve is used to control the amount of uranium hexafluoride tail gas entering the leaching tower 101 to not exceed 100 g / h.

[0063] In an exemplary embodiment, it can be understood that the tail gas enters the leaching tower 101 through the tail gas input channel 108, and the tail gas inlet control valve on the tail gas input channel 108 controls the amount of uranium hexafluoride tail gas entering the leaching tower 101 to not exceed 100g / h, thereby controlling the processing rate of the uranium hexafluoride tail gas.

[0064] In an exemplary embodiment, the eluent in the eluent tower 101 does not pass through the tail gas input interface. Figure 1 shown.

[0065] In an exemplary embodiment, the eluent in the eluent tower 101 does not pass through the tail gas input interface. The purpose of this setting is to allow the uranium hexafluoride tail gas to directly react with the eluent when entering the eluent tower 101. Because uranium hexafluoride contains uranyl fluoride, hydrogen fluoride and a small amount of uranium hexafluoride, the reaction equation of uranium hexafluoride and water is:

[0066] UF6+H2O→UO2F2+HF

[0067] The reaction equation of uranyl fluoride and sodium bicarbonate is:

[0068] UO2F2+NaHCO3→UO2(HCO3)2+NaF

[0069] The reaction equation of hydrogen fluoride and sodium bicarbonate is:

[0070] HF+NaHCO3→H2O+CO2+NaF

[0071] In an exemplary embodiment, according to the above chemical reaction formula, when uranium hexafluoride tail gas contains uranium hexafluoride, the uranium hexafluoride reacts with water in a sodium bicarbonate solution to produce uranyl fluoride and hydrogen fluoride; both uranyl fluoride and hydrogen fluoride will chemically react with the sodium bicarbonate solution and further decompose, thereby achieving the purpose of filtering uranyl fluoride and hydrogen fluoride.

[0072] In an exemplary embodiment, the elution unit further includes: an elution liquid circulation channel 110 and a elution nozzle 103 .

[0073] In an exemplary embodiment, the elution nozzle 103 is disposed in the elution tower 101 .

[0074] In an exemplary embodiment, the elution nozzle 103 is disposed at the upper portion of the elution tower 101. For example, the elution nozzle 103 is disposed at the upper portion of the elution tower 101. Figure 1As shown; of course, the rinsing nozzle 103 can also be suspended on the side wall of the rinsing tower 101 as needed.

[0075] In an exemplary embodiment, the elution nozzle 103 is located above the eluent in the elution tower 101. This arrangement is to allow the uranium hexafluoride tail gas emerging from the eluent to be sprayed again with the eluent, thereby increasing the reaction time between the uranium hexafluoride tail gas and the eluent, making the reaction between the two more complete.

[0076] In an exemplary embodiment, the eluent circulation channel 110 may be partially disposed outside the eluent tower 101 as required, such as Figure 1 shown.

[0077] In an exemplary embodiment, the eluent circulation channel 110 connects the eluent in the eluent tower 101 and the eluent nozzle 103 .

[0078] In an exemplary embodiment, a circulation pump is provided on the eluent circulation channel 110 .

[0079] In an exemplary embodiment, the circulation pump transports the eluent in the eluent tower 101 to the eluent nozzle 103, and the eluent nozzle 103 sprays the uranium hexafluoride tail gas entering the eluent tower 101; the eluent nozzle 103 sprays the uranium hexafluoride tail gas emerging from the eluent with the eluent, thereby increasing the reaction time of the uranium hexafluoride tail gas and the eluent, making the reaction between the two more complete.

[0080] In an exemplary embodiment, the elution unit further includes a circulation tank 102 .

[0081] In an exemplary embodiment, the circulation tank 102 is in communication with the eluent circulation channel 110 .

[0082] In an exemplary embodiment, when the sodium bicarbonate solution in the elution tower 101 is lower than a threshold value, the circulation tank 102 replenishes the sodium bicarbonate solution to the elution tower 101; it can be understood that after the sodium bicarbonate solution in the elution tower 101 reacts with the uranium hexafluoride tail gas, when the content of sodium bicarbonate is lower than the threshold value, the sodium bicarbonate solution in the elution tower 101 needs to be replenished, at this time, the circulation tank 102 is opened to communicate with the eluent circulation channel 110, and the connection between the eluent circulation channel 110 and the eluent at the bottom of the elution tower 101 is closed, and at this time, This is achieved by setting a three-way valve between the circulation tank 102 and the eluent circulation channel 110; when the circulation tank 102 is not needed to supply eluent, the three-way valve closes the connection between the circulation tank 102 and the eluent circulation channel 110, and the eluent circulation channel 110 connects the eluent at the bottom of the elution tower 101 with the eluent nozzle 103; when the eluent needs to be supplied to the elution tower 101, the three-way valve opens the connection between the circulation tank 102 and the eluent circulation channel 110, and closes the connection between the eluent circulation channel 110 and the eluent at the bottom of the elution tower 101.

[0083] In an exemplary embodiment, a medicine dispensing tank is further disposed in the circulation tank 102 .

[0084] In an exemplary embodiment, a stirring device is provided in the pharmaceutical dispensing tank.

[0085] In an exemplary embodiment, the dispensing tank is used to prepare a sodium bicarbonate solution.

[0086] In an exemplary embodiment, when the circulation tank 102 is required to replenish the eluent in the eluent tower 101 , the eluent in the eluent tower 101 that cannot meet the usage requirements can be first discharged through the waste liquid output channel 109 .

[0087] In an exemplary embodiment, the waste liquid output channel 109 is connected to the lower part of the elution tower 101, for example, the interface between the waste liquid output channel 109 and the elution tower 101 is arranged below the interface between the eluent circulation channel 110 and the elution tower 101, such as Figure 1 shown.

[0088] In an exemplary embodiment, the waste liquid output channel 109 is externally connected to a waste liquid treatment unit, and the waste liquid treatment unit is used to treat the waste eluent output from the eluent tower 101 .

[0089] In an exemplary embodiment, a pH meter is provided at the bottom of the elution tower 101 for detecting the pH value of the eluent in the elution tower 101. It can be understood that by detecting the change in the pH value of the eluent in the elution tower 101, it is determined whether the eluent in the current elution tower 101 can meet the use requirements.

[0090] In an exemplary embodiment, for example, the pH value of the initial state of the eluent in the eluent tower 101 is not less than 11, that is, when the pH value of the eluent in the eluent tower 101 is not less than 11, it is considered that the eluent in the current eluent tower 101 can meet the usage requirements.

[0091] In an exemplary embodiment, the pH value of the eluent in the eluent tower 101 decreases after reacting with the uranium hexafluoride tail gas. When the pH value of the eluent in the eluent tower 101 is detected to be lower than 8, it is determined that the current eluent cannot meet the use requirements and has reached the standard of eluent waste liquid and needs to be replaced.

[0092] In an exemplary embodiment, the discharge of the waste eluent in the elution tower 101 and the replenishment of new eluent can be carried out simultaneously or separately; when it is necessary to carry out them separately, the tail gas inlet control valve is first closed to stop the entry of uranium hexafluoride tail gas, and then the waste liquid output channel 109 is opened to empty the waste eluent, and then new eluent is replenished through the circulation tank 102.

[0093] In an exemplary embodiment, an altimeter is further provided at the bottom of the elution tower 101 , and the altimeter is used to detect the height of the eluent in the elution tower 101 , so as to control and adjust the amount of the eluent in the elution tower 101 .

[0094] In an exemplary embodiment, the uranium hexafluoride tail gas enters the heating unit after reacting with the eluent.

[0095] In an exemplary embodiment, the uranium hexafluoride tail gas reacts with the sodium bicarbonate solution in the leaching tower 101 and then enters the heating unit for drying.

[0096] In an exemplary embodiment, a heater 104 and a thermometer for detecting the operation of the heater 104 are provided in the heating unit.

[0097] In an exemplary embodiment, the heating temperature of the heating unit ranges from 60 to 100°C.

[0098] In an exemplary embodiment, the heater 104 is used because the moisture content of the uranium hexafluoride tail gas after elution in the elution tower 101 is relatively high, and it is difficult to ensure subsequent further filtering treatment without drying treatment.

[0099] In an exemplary embodiment, the gas dried by the heating unit enters the filtering unit for filtering.

[0100] In an exemplary embodiment, the filtration unit includes a filter 105 .

[0101] In an exemplary embodiment, a pressure gauge is provided on the filter 105 .

[0102] In an exemplary embodiment, the filtration unit is used to filter the residual uranyl fluoride and hydrogen fluoride in the elution column 101 .

[0103] In an exemplary embodiment, the filtering unit is provided to take into account that the residual uranium hexafluoride tail gas in the elution tower 101 has not been completely reacted and treated, and the residual uranyl fluoride and hydrogen fluoride are filtered through the filtering unit so that the filtering efficiency of uranyl fluoride and hydrogen fluoride reaches 99%.

[0104] In an exemplary embodiment, the uranium hexafluoride tail gas is first eluted by a elution unit, and the uranium hexafluoride tail gas reacts chemically with the eluent in the elution unit, and then enters a heating unit to heat and dry the gas coming out of the elution unit. After drying, the uranium hexafluoride tail gas enters a filtering unit for filtering.

[0105] In an exemplary embodiment, an exhaust passage is connected to the rear end of the filter 105 , and an anemometer and a fan 106 are provided on the exhaust passage.

[0106] In an exemplary embodiment, the fan 106 is provided to enhance the exhaust capability of the exhaust passage for the gas processed by the filter unit.

[0107] In an exemplary embodiment, optionally, a chimney 107 is connected to the end of the exhaust passage.

[0108] In an exemplary embodiment, the wind speed of the fan 106 is controllable, that is, the exhaust volume of the exhaust passage can be adjusted.

[0109] Although the embodiments disclosed in the present invention are as above, the contents are only embodiments adopted to facilitate understanding of the present invention and are not intended to limit the present invention. Any technician in the field to which the present invention belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. A uranium hexafluoride tail gas treatment system, characterized in that: include: A rinsing unit, a heating unit and a filtering unit; The elution unit is connected to the filtering unit through the heating unit; The elution unit includes an elution tower; The elution tower is provided with an elution liquid; The eluent comprises a sodium bicarbonate solution; The uranium hexafluoride tail gas reacts with the sodium bicarbonate solution in the leaching tower and then enters the heating unit for drying treatment; The gas dried by the heating unit enters the filtering unit for filtering.

2. The uranium hexafluoride tail gas treatment system according to claim 1, characterized in that: A tail gas input interface is provided at the lower part of the elution tower; The uranium hexafluoride tail gas enters the leaching tower through the tail gas input interface; The eluent in the eluent tower is submerged in the tail gas input interface.

3. The uranium hexafluoride tail gas treatment system according to claim 2, characterized in that: The rinsing unit further comprises: Eluent circulation channel and eluent nozzle; The elution nozzle is arranged in the elution tower, and the elution nozzle is arranged at the upper part of the elution tower; The eluent circulation channel is connected to the eluent in the eluent tower and the eluent nozzle; A circulation pump is provided on the eluent circulation channel; The circulation pump transports the eluent in the eluent tower to the eluent nozzle, and the eluent nozzle sprays the uranium hexafluoride tail gas entering the eluent tower.

4. The uranium hexafluoride tail gas treatment system according to claim 3, characterized in that: The elution nozzle is located above the elution liquid in the elution tower.

5. The uranium hexafluoride tail gas treatment system according to claim 1, characterized in that: The uranium hexafluoride tail gas enters the heating unit after reacting with the eluent; The heating temperature of the heating unit is 60-100°C.

6. The uranium hexafluoride tail gas treatment system according to claim 1, characterized in that: The filtering unit is used to filter the residual uranyl fluoride and hydrogen fluoride in the elution tower.

7. The uranium hexafluoride tail gas treatment system according to claim 1, characterized in that: The mass proportion of sodium bicarbonate in the sodium bicarbonate solution is 8%.

8. The uranium hexafluoride tail gas treatment system according to claim 2, characterized in that: The exhaust gas input interface is externally connected to an exhaust gas input channel; The tail gas input channel is provided with a tail gas inlet control valve, and the tail gas inlet control valve is used to control the amount of the uranium hexafluoride tail gas entering the leaching tower to not exceed 100g / h.

9. The uranium hexafluoride tail gas treatment system according to claim 3, characterized in that: The rinsing unit also includes: A circulation tank, the circulation tank being in communication with the eluent circulation channel; When the sodium bicarbonate solution in the elution tower is lower than a threshold value, the circulation tank replenishes the sodium bicarbonate solution to the elution tower.

10. The uranium hexafluoride tail gas treatment system according to claim 9, characterized in that: The circulation tank is also provided with a medicine dispensing tank, and the medicine dispensing tank is provided with a stirring device; The dispensing tank is used for preparing the sodium bicarbonate solution.

Images