A device and method for stabilizing the reflux of secondary steam condensate of radioactive waste liquid

Abstract

In order to solve the technical problem that the reflux of secondary steam condensate is unstable in the prior art, which affects the efficiency of bubble tower cleaning, the embodiment of the present invention provides a stable reflux device and method for secondary steam condensate of radioactive waste liquid, including: a waste liquid evaporator, which is used to communicate with a liquid storage tank for storing waste liquid; a purifier, which is used to communicate with the waste liquid evaporator; a condenser, which is used to communicate with the purifier; a cooler, which is used to communicate with the condenser; and a stable reflux device, one end of which is used to communicate with the pipeline between the condenser and the cooler, and the other end is used to communicate with the bubble tower cleaning section of the waste liquid evaporator to adjust the liquid flow rate of the bubble tower cleaning section refluxed to the waste liquid evaporator so that the liquid level of the bubble tower cleaning section of the waste liquid evaporator remains stable. The embodiment of the present invention can keep the liquid level of the bubble tower cleaning section of the waste liquid evaporator stable, while avoiding safety accidents, and improving the decontamination efficiency of radioactive waste liquid.

Description

Technical Field

[0001] The invention relates to a device and method for stabilizing the reflux of secondary steam condensate of radioactive waste liquid. Background Art

[0002] Waste liquid evaporation is the core process of radioactive waste liquid treatment. The current treatment process generally adopted is: first preheat the waste liquid from the liquid storage tank, and then enter the central circulation tubular natural circulation evaporator for evaporation, and the waste liquid in the evaporation section circulates naturally inside. After gravity separation, the secondary steam is successively purified by multi-stage bubble tower cleaning and high-efficiency wire mesh demister. The secondary steam leaving the evaporator enters the high-efficiency purifier to remove radioactive droplets again, and then enters the condenser to form secondary steam condensate. A branch pipe is provided on the pipeline where the secondary steam condensate enters the cooler to allow part of the secondary steam condensate to flow back to the evaporator bubble tower cleaning section.

[0003] The water used for cleaning is mostly secondary steam condensate that has undergone multi-stage purification, and whether the condensate reflux is stable is closely related to the efficiency of radioactive waste liquid purification: if the condensate reflux is insufficient, it will affect the cleaning efficiency of the bubble tower, resulting in a low decontamination factor, which will affect the decontamination effect; if the condensate refluxes too much, it will submerge the bubble and wire mesh demister, causing the secondary steam to be unable to enter the purifier, resulting in excessive pressure in the separation chamber, and thus unable to operate stably or even cause a safety accident. Summary of the invention

[0004] In order to solve the technical problem in the prior art that the unstable reflux of secondary steam condensate affects the cleaning efficiency of the bubble tower, the embodiment of the present invention provides a device and method for stable reflux of secondary steam condensate of radioactive waste liquid.

[0005] The embodiment of the present invention is achieved through the following technical solutions:

[0006] In a first aspect, an embodiment of the present invention provides a device for stabilizing the reflux of secondary steam condensate of radioactive waste liquid, comprising:

[0007] A waste liquid evaporator, used to be connected to a liquid storage tank for storing waste liquid;

[0008] A purifier, used for communicating with the waste liquid evaporator;

[0009] A condenser, used for communicating with the purifier;

[0010] a cooler, configured to communicate with the condenser; and

[0011] A stable reflux device has one end for connecting with the pipeline between the condenser and the cooler, and the other end for connecting with the bubble tower cleaning section of the waste liquid evaporator to adjust the liquid flow rate of the bubble tower cleaning section of the waste liquid evaporator to keep the liquid level of the bubble tower cleaning section of the waste liquid evaporator stable.

[0012] Furthermore, a first valve is provided in the pipeline between the condenser and the cooler.

[0013] Furthermore, the stable reflux device comprises:

[0014] a metering pump for communicating with a pipeline between the condenser and the cooler; and

[0015] A flow meter has one end connected to a metering pump through a pipeline, and the other end connected to a bubble tower cleaning section of a waste liquid evaporator.

[0016] Furthermore, the stable reflux device also includes:

[0017] Parallel valve, one end of which is used to connect with the pipeline between the condenser and the cooler, and the other end of which is used to connect with the pipeline between the flow meter and the metering pump.

[0018] Furthermore, the metering pump is connected to the pipeline between the condenser and the cooler through the second valve.

[0019] Furthermore, the other end of the parallel valve is connected to the pipeline between the flow meter and the metering pump through a third valve.

[0020] Furthermore, it also includes a control unit for connecting to the parallel valve, the first valve, the second valve, the third valve, the metering pump, the flow meter and the bubble tower cleaning section liquid level sensor unit of the waste liquid evaporator respectively.

[0021] In a second aspect, an embodiment of the present invention provides a method for stable reflux of secondary steam condensate of radioactive waste liquid, based on the stable reflux device, comprising:

[0022] Receiving liquid level value data from a liquid level sensing unit;

[0023] The liquid level value data is compared with a preset value, and the first valve and the stable reflux device are controlled according to the comparison result data to adjust the liquid flow rate of the bubble tower cleaning section of the waste liquid evaporator to keep the liquid level of the bubble tower cleaning section of the waste liquid evaporator stable.

[0024] Furthermore, the liquid level value data is compared with a preset value, and the first valve and the stable reflux device are controlled according to the comparison result to adjust the liquid flow rate of the bubble tower cleaning section of the waste liquid evaporator to be refluxed to keep the liquid level of the bubble tower cleaning section of the waste liquid evaporator stable; including:

[0025] According to the comparison result data, the opening of the first valve and each valve of the stable reflux device is adjusted and / or the opening and closing of the metering pump is controlled to adjust the liquid flow rate of the bubble tower cleaning section of the waste liquid evaporator to keep the liquid level of the bubble tower cleaning section of the waste liquid evaporator stable.

[0026] In a third aspect, an embodiment of the present invention provides a method for stable reflux of secondary steam condensate of radioactive waste liquid, based on the stable reflux device, comprising:

[0027] Transporting radioactive waste liquid to the waste liquid evaporator;

[0028] The radioactive waste liquid is formed into secondary steam in the waste liquid evaporator through the heating evaporation section of the waste liquid evaporator, and then the secondary steam is purified in sequence through the gravity separation section, bubble cleaning section and wire mesh defoaming section of the waste liquid evaporator;

[0029] The purified secondary steam is passed through a purifier to remove the entrained mist;

[0030] The secondary steam with mist entrainment removed is passed through a condenser to form secondary steam condensate;

[0031] The secondary steam condensate is refluxed to the bubble tower cleaning section through a stable reflux device to control the liquid level of the bubble tower cleaning section of the waste liquid evaporator to remain stable.

[0032] Compared with the prior art, the embodiments of the present invention have the following advantages and beneficial effects:

[0033] A device and method for stabilizing the reflux of secondary steam condensate of radioactive waste liquid in an embodiment of the present invention, through a stable reflux device, adjusts the liquid flow rate of the bubble tower cleaning section of the waste liquid evaporator to keep the liquid level of the bubble tower cleaning section of the waste liquid evaporator stable, thereby improving the decontamination efficiency of the radioactive waste liquid while avoiding safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 This is a schematic diagram of the structure of a stable reflux device for secondary steam condensate of radioactive waste liquid.

[0036] Figure 2 The present invention is a schematic flow diagram of a method for stable reflux of secondary steam condensate of radioactive waste liquid.

[0037] Figure 3 The figure is a schematic flow chart of another method for the stable reflux of secondary steam condensate of radioactive waste liquid.

[0038] Marks and corresponding parts names in the attached drawings:

[0039] 1-purifier, 2-bubble tower cleaning section, 3-waste liquid evaporator, 4-flow meter, 5-third valve, 6-metering pump, 7-second valve, 8-first valve, 9-condenser, 10-cooler, 11-parallel valve. DETAILED DESCRIPTION

[0040] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0041] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is apparent to one of ordinary skill in the art that these specific details are not necessarily employed to practice the present invention. In other embodiments, in order to avoid obscuring the present invention, well-known structures, circuits, materials, or methods are not specifically described.

[0042] Throughout the specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment," "an embodiment," "an example," or "an example" appearing in various places throughout the specification do not necessarily all refer to the same embodiment or example. In addition, particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. In addition, it will be appreciated by those of ordinary skill in the art that the figures provided herein are for illustrative purposes and that the figures are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0043] In the description of the present invention, the directions or positional relationships indicated by terms such as “front”, “rear”, “left”, “right”, “up”, “down”, “vertical”, “horizontal”, “high”, “low”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0044] Example

[0045] In order to solve the technical problem that the secondary steam condensate reflux is unstable in the prior art, which affects the efficiency of bubble tower cleaning, in the first aspect, the embodiment of the present invention provides a stable reflux device for secondary steam condensate of radioactive waste liquid, referring to Figure 1 As shown, it includes: a waste liquid evaporator 3, which is used to be connected to a liquid storage tank for storing waste liquid; a purifier 1, which is used to be connected to the waste liquid evaporator; a condenser 9, which is used to be connected to the purifier; a cooler 10, which is used to be connected to the condenser; and a stabilizing reflux device, one end of which is used to be connected to the pipeline between the condenser and the cooler, and the other end is used to be connected to the bubble tower cleaning section 2 of the waste liquid evaporator to adjust the liquid flow rate of the bubble tower cleaning section refluxed to the waste liquid evaporator so that the liquid level of the bubble tower cleaning section of the waste liquid evaporator remains stable.

[0046] refer to Figure 1 As shown, the top of the waste liquid evaporator is connected to the lower part of the purifier through a pipeline; the upper part of the purifier is connected to the condenser through a pipeline, and the lower part of the condenser is connected to the cooler through a pipeline; the bubble tower cleaning section of the waste liquid evaporator 3 is connected to the pipeline between the condenser 9 and the cooler 10 through a stable reflux device.

[0047] Thus, the embodiment of the present invention adjusts the liquid flow rate of the bubble tower cleaning section of the waste liquid evaporator by stabilizing the reflux device, thereby maintaining a stable liquid level in the bubble tower cleaning section of the waste liquid evaporator, thereby avoiding safety accidents and improving the decontamination efficiency of radioactive waste liquid. The embodiment of the present invention effectively avoids the normal operation of the bubble tower cleaning device and possible safety accidents caused by the instability of the secondary steam condensate reflux. In addition, the method makes the equipment layout more flexible and variable, solves the problem that there must be a huge drop between the condenser and the evaporator in the traditional method, and greatly saves construction costs.

[0048] Furthermore, a first valve 8 is provided in the pipeline between the condenser and the cooler.

[0049] By providing the first valve, it is possible to control the flow rate of the condensate from the condenser into the cooler, thereby facilitating the control of the flow rate of the liquid in the bubble tower cleaning section that flows back to the waste liquid evaporator.

[0050] Further, the stable reflux device includes: a metering pump 6, which is used to communicate with the pipeline between the condenser and the cooler; and a flow meter 4, one end of which is used to communicate with the metering pump through the pipeline, and the other end is used to communicate with the bubble tower cleaning section of the waste liquid evaporator. Further, the metering pump is connected to the pipeline between the condenser 9 and the cooler 10 through the second valve 7.

[0051] refer to Figure 1 As shown, the right end of the metering pump is connected to the pipeline between the condenser 9 and the cooler 10 through the second valve, and the left end of the metering pump is connected to the bubble tower cleaning section of the waste liquid evaporator through the flow meter; thereby, it is convenient to control the flow of condensate entering the bubble tower cleaning section of the waste liquid evaporator by controlling the metering pump.

[0052] Furthermore, the stable reflux device also includes:

[0053] The parallel valve 11 has one end for communicating with the pipeline between the condenser and the cooler, and the other end for communicating with the pipeline between the flow meter and the metering pump.

[0054] refer to Figure 1 As shown, a parallel valve 11 is connected in parallel above the metering pump and the second valve 7. Therefore, when the flow of condensate between the condenser and the cooler is large, it can be diverted through the pipeline where the parallel valve 11 is located and the pipeline where the metering pump is located, thereby playing a better role in stabilizing the flow pressure between the condenser and the cooler.

[0055] Furthermore, the other end of the parallel valve is connected to the pipeline between the flow meter and the metering pump through the third valve 5.

[0056] refer to Figure 1 As shown, the right end of the parallel valve 11 is connected to the pipeline between the flow meter and the metering pump through the third valve 5; thus, the flow measured by the flow meter is the sum of the flow from the pipeline where the parallel valve 11 is located and the pipeline where the metering pump is located.

[0057] In order to facilitate the control of the flow rate of the condensate reflux and ensure the stability of the liquid level of the bubble tower cleaning section in the waste liquid evaporator, it also includes a control unit for connecting to the parallel valve, the first valve, the second valve, the third valve, the metering pump, the flow meter and the bubble tower cleaning section liquid level sensor unit of the waste liquid evaporator respectively.

[0058] Optionally, the parallel valve, the first valve, the second valve and the third valve are all electric valves.

[0059] In a second aspect, an embodiment of the present invention provides a method for stable reflux of secondary steam condensate of radioactive waste liquid, based on the stable reflux device, referring to Figure 2 As shown, including:

[0060] S10. Receive the liquid level value data of the liquid level sensing unit;

[0061] S20. Compare the liquid level value data with the preset value, and control the first valve and the stable reflux device according to the comparison result data to adjust the liquid flow rate of the bubble tower cleaning section of the waste liquid evaporator to keep the liquid level of the bubble tower cleaning section of the waste liquid evaporator stable.

[0062] The liquid level of the bubble tower cleaning section of the waste liquid evaporator can be adjusted by controlling the first valve and the stable reflux device through the control unit, so that the liquid level of the bubble tower cleaning section of the waste liquid evaporator can be automatically adjusted to keep the liquid level stable.

[0063] Optionally, the preset value may include a maximum threshold, a minimum threshold, and any value between the maximum threshold and the minimum threshold; by comparing the corresponding bubble tower cleaning section liquid level with different values ​​in the preset value, it can be determined whether the state of the waste liquid evaporator is normal or abnormal, thereby, it can play a certain alarm role and avoid accidents in the waste liquid evaporator by controlling the first valve and the stable reflux device through the control unit.

[0064] Optionally, a control method is to compare the liquid level value data with a preset value, and control the first valve and the stable reflux device according to the comparison result to adjust the liquid flow rate of the bubble tower cleaning section of the waste liquid evaporator to be refluxed to keep the liquid level of the bubble tower cleaning section of the waste liquid evaporator stable; including:

[0065] According to the comparison result data, the opening of the first valve and each valve of the stable reflux device is adjusted and / or the opening and closing of the metering pump is controlled to adjust the liquid flow rate of the bubble tower cleaning section of the waste liquid evaporator to keep the liquid level of the bubble tower cleaning section of the waste liquid evaporator stable.

[0066] Therefore, the opening of the first valve and each valve of the stable reflux device can be adjusted and / or the opening and closing of the metering pump or its parameters can be controlled according to the comparison result, so as to adjust the liquid flow rate of the bubble tower cleaning section of the waste liquid evaporator to keep the liquid level of the bubble tower cleaning section of the waste liquid evaporator stable.

[0067] In a third aspect, an embodiment of the present invention provides a method for stabilizing the reflux of secondary steam condensate of radioactive waste liquid, based on the stable reflux device, referring to Figure 3 As shown, including:

[0068] S101. The radioactive waste liquid is transported to the waste liquid evaporator;

[0069] S102. The radioactive waste liquid is formed into secondary steam in the waste liquid evaporator through the heating evaporation section of the waste liquid evaporator, and then the secondary steam is purified in sequence through the gravity separation section, bubble cleaning section and wire mesh defoaming section of the waste liquid evaporator;

[0070] S103. The purified secondary steam is passed through a purifier to remove the entrained mist;

[0071] S104. The secondary steam entrained by the mist is removed and passed through a condenser to form a secondary steam condensate;

[0072] S105. The secondary steam condensate is refluxed to the bubble tower cleaning section through a stable reflux device to control the liquid level of the bubble tower cleaning section of the waste liquid evaporator to remain stable.

[0073] The implementation principle of the above method is the same as the above method and device, which will not be repeated here.

[0074] Therefore, the embodiment of the present invention is simple to operate and can realize the reflux of secondary steam condensate to the evaporator bubble tower cleaning section at a stable flow rate. Compared with the traditional method of allowing the secondary steam condensate to flow back to the evaporator bubble tower cleaning section by gravity through the huge drop in height between the condenser and the evaporator, the embodiment of the present invention effectively avoids the normal operation of the bubble tower cleaning device and possible safety accidents caused by the instability of the reflux of the secondary steam condensate. In addition, the method makes the equipment layout more flexible and changeable, solves the problem that there must be a huge drop in height between the condenser and the evaporator in the traditional method, and greatly saves construction costs.

[0075] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for stabilizing the reflux of secondary steam condensate of radioactive waste liquid, characterized in that: include: A waste liquid evaporator, used to be connected to a liquid storage tank for storing waste liquid; A purifier, used for communicating with the waste liquid evaporator; A condenser, used for communicating with the purifier; a cooler, configured to communicate with the condenser; and A stable reflux device, one end of which is used to communicate with the pipeline between the condenser and the cooler, and the other end of which is used to communicate with the bubble tower cleaning section of the waste liquid evaporator to adjust the liquid flow rate of the bubble tower cleaning section of the waste liquid evaporator to keep the liquid level of the bubble tower cleaning section of the waste liquid evaporator stable; The stable reflux device comprises: a metering pump for communicating with a pipeline between the condenser and the cooler; and A flow meter, one end of which is used to be connected to the metering pump through a pipeline, and the other end of which is used to be connected to the bubble tower cleaning section of the waste liquid evaporator; The stable reflux device also includes: Parallel valve, one end of which is used to connect with the pipeline between the condenser and the cooler, and the other end of which is used to connect with the pipeline between the flow meter and the metering pump.

2. The radioactive waste liquid secondary steam condensate stable reflux device as claimed in claim 1, characterized in that: A first valve is provided on the pipeline between the condenser and the cooler.

3. The device for stable reflux of secondary steam condensate of radioactive waste liquid as claimed in claim 1, characterized in that: The metering pump is communicated with the pipeline between the condenser and the cooler through the second valve.

4. The device for stabilizing the reflux of secondary steam condensate of radioactive waste liquid as claimed in claim 3, characterized in that: The other end of the parallel valve is communicated with the pipeline between the flow meter and the metering pump through the third valve.

5. The device for stable reflux of secondary steam condensate of radioactive waste liquid as claimed in claim 4, characterized in that: It also includes a control unit for connecting to the parallel valve, the first valve, the second valve, the third valve, the metering pump, the flow meter and the bubble tower cleaning section liquid level sensor unit of the waste liquid evaporator respectively.

6. A method for stable reflux of secondary steam condensate of radioactive waste liquid, characterized in that: The stable reflux device according to any one of claims 1 to 5 comprises: Receiving liquid level value data from a liquid level sensing unit; The liquid level value data is compared with the preset value, and the first valve and the stable reflux device are controlled according to the comparison result data to adjust the liquid flow rate of the bubble tower cleaning section of the waste liquid evaporator to keep the liquid level of the bubble tower cleaning section of the waste liquid evaporator stable.

7. The method for stable reflux of secondary steam condensate of radioactive waste liquid as claimed in claim 6, characterized in that: The liquid level value data is compared with a preset value, and the first valve and the stable reflux device are controlled according to the comparison result to adjust the liquid flow rate of the bubble tower cleaning section of the waste liquid evaporator to be refluxed to keep the liquid level of the bubble tower cleaning section of the waste liquid evaporator stable; including: According to the comparison result data, the opening of the first valve and each valve of the stable reflux device is adjusted and / or the opening and closing of the metering pump is controlled to adjust the liquid flow rate of the bubble tower cleaning section of the waste liquid evaporator to keep the liquid level of the bubble tower cleaning section of the waste liquid evaporator stable.

8. A method for stable reflux of secondary steam condensate of radioactive waste liquid, characterized in that: The stable reflux device according to any one of claims 1 to 5 comprises: transporting radioactive waste liquid to the waste liquid evaporator; The radioactive waste liquid is formed into secondary steam in the waste liquid evaporator through the heating evaporation section of the waste liquid evaporator, and then the secondary steam is purified in sequence through the gravity separation section, bubble cleaning section and wire mesh defoaming section of the waste liquid evaporator; The purified secondary steam is passed through a purifier to remove the entrained mist; The secondary steam with mist entrainment removed is passed through a condenser to form secondary steam condensate; The secondary steam condensate is refluxed to the bubble tower cleaning section through a stable reflux device to control the liquid level of the bubble tower cleaning section of the waste liquid evaporator to remain stable.

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