Nuclear waste treatment method

Abstract

The application relates to a nuclear waste treatment method of a nuclear power plant special tool, which comprises the following steps: S1, starting a fan of a dust removal device to form a negative pressure in a cutting room of a cutting device; S2, starting a laser cutting machine of the cutting device to perform a cutting operation in the cutting room, and the fan continuously operates to provide suction to suck dust in the cutting room out; and S3, after the laser cutting machine stops operating, the fan is delayed to operate and then stops. The nuclear waste treatment method provided by the application makes the fan operate prior to the laser cutting machine, avoids the situation that dust diffuses out of the cutting room to pollute the environment when cutting starts, makes the fan operate after the laser cutting machine stops, further sucks the residual dust in the cutting room, controls the starting time and the closing time of the fan, thereby reducing the content of the residual dust in the cutting room and reducing the diffusion risk of the residual dust.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of special tools for nuclear power plants, and particularly to a nuclear waste treatment method. BACKGROUND

[0002] Metal devices used in a nuclear power plant need to be cut by a cutting device after decommissioning, and dust generated in the cutting process is collected by a dust removal device. The cutting device includes a cutting room and a laser cutting machine arranged in the cutting room. The metal device is placed in the cutting room and cut by the laser cutting machine. The dust removal device includes a fan that provides suction. The dust removal device and the cutting device are started and stopped synchronously. The fan is started to suck the dust in the cutting room out. However, when the dust removal device and the cutting device are started synchronously, the suction provided by the fan cannot reach the cutting room in time, so there is a situation that dust spreads out of the cutting room to pollute the environment when cutting starts. After the dust removal device and the cutting device are stopped synchronously, if the dust removal device does not completely collect the dust in the cutting room, the remaining dust in the cutting room will also spread to pollute the environment. SUMMARY

[0003] Therefore, it is necessary to provide a nuclear waste treatment method to solve the problem of collecting dust.

[0004] A nuclear waste treatment method, comprising:

[0005] S1, starting a fan of a dust removal device to form negative pressure in a cutting room of a cutting device;

[0006] S2, starting a laser cutting machine of the cutting device to make the laser cutting machine perform cutting operation in the cutting room. When the cutting operation is performed, the fan continuously operates to provide suction to suck dust in the cutting room out.

[0007] S3, after the laser cutting machine stops operation, the fan runs for a delay time and then stops.

[0008] In one embodiment, in the step S1, after the fan runs for a first preset time, a pressure difference value between pressure in the cutting room and pressure outside the cutting room is calculated.

[0009] If the pressure difference value is negative, it is determined that negative pressure is formed in the cutting room.

[0010] If the pressure difference value is 0 or positive, it is determined that negative pressure is not formed in the cutting room, and an alarm reminds the operator to overhaul the airtightness of the cutting room.

[0011] In one of the embodiments, when the calculated pressure difference value is negative, the fan runs for a second preset time, and then the current pressure difference value is calculated again to determine whether the difference between the current pressure difference value and the last pressure difference value is within a preset range.

[0012] If the difference is within the preset range, it is determined that the pressure difference in the cutting room is stable, and the step S2 is executed.

[0013] If the difference is not within the preset pressure difference range, it is determined that the pressure difference in the cutting room is unstable, and the difference between the current pressure difference value and the last pressure difference value is determined again whether it is within the preset range.

[0014] In one of the embodiments, before starting the laser cutting machine, it is determined whether the current cutting piece meets the cutting condition.

[0015] If the cutting condition is met, the laser cutting machine is started for the cutting operation.

[0016] If the cutting condition is not met, the foreign matter on the current cutting piece is removed or the cutting piece is replaced.

[0017] In one of the embodiments, after determining that the current cutting piece meets the cutting condition, it is determined whether the laser cutting machine can operate normally.

[0018] If the laser cutting machine can operate normally, the laser cutting machine is started for the cutting operation.

[0019] If the laser cutting machine cannot operate normally, an alarm is given to remind the operator to repair the laser cutting machine.

[0020] In one of the embodiments, during the cutting operation, the transportation speed of the cutting piece, the cutting efficiency of the laser cutting machine, the pressure in the cutting room, the pressure outside the cutting room, and the dust concentration in the cutting room are monitored in real time.

[0021] In one of the embodiments, after the fan is stopped, the real-time monitoring is also stopped.

[0022] In one of the embodiments, in the step S3, after the cutting device stops operating, the remaining devices of the dust removal device except the fan run for a third preset time and then stop, and after the remaining devices stop, the fan runs for a fourth preset time and then stops.

[0023] In one of the embodiments, in the step S1, the fan and the air outlet of the cutting room are connected, and a protective net is arranged at the air outlet to prevent foreign matter from entering the fan.

[0024] In one of the embodiments, in the step S2, the cutting operation is started after the protection operation function of the controller of the laser cutting machine is started for the fifth preset time, wherein the protection operation function includes overload, short circuit, and open phase functions.

[0025] The present application has the following advantages:

[0026] The nuclear waste treatment method provided by the present application starts the fan of the dust removal device, the fan provides suction to extract air in the cutting house of the cutting device, thereby forming negative pressure in the cutting house, and then starts the laser cutting machine of the cutting device after the negative pressure is formed in the cutting house, and performs cutting operation in the cutting house by using the laser cutting machine. During the cutting operation, the fan continues to operate to provide suction to extract dust in the cutting house. After the laser cutting machine stops operating, the fan is delayed to operate and then stops. The fan is delayed to operate compared with the laser cutting machine, so as to extract the remaining dust in the cutting house, reduce the content of the remaining dust in the cutting house, and reduce the probability of diffusion of the remaining dust in the cutting house to pollute the environment. The fan is started to operate before the laser cutting machine, so as to extract air in the cutting house in advance, and avoid the situation that dust is diffused out of the cutting house to pollute the environment when the cutting is started. The nuclear waste treatment method provided by the present application starts the fan before the laser cutting machine, avoids the situation that dust is diffused out of the cutting house to pollute the environment when the cutting is started, and further extracts the remaining dust in the cutting house after the laser cutting machine stops operating. By controlling the starting time and the closing time of the fan, the content of the remaining dust in the cutting house is reduced, and the risk of diffusion of the remaining dust is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The flowchart of the nuclear waste treatment method provided by the present application is shown in the following figure.

[0028] Figure 2 The flowchart of the step S1 provided by the present application is shown in the following figure. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present application more apparent and comprehensible, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, a large number of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the scope of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0030] In the description of the application, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the application.

[0031] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0032] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or it can only mean that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or it can only mean that the horizontal height of the first feature is less than that of the second feature.

[0034] It is to be noted that when an element is referred to as being "on" or "connected to" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar terms as used herein are for the purpose of description only and are not intended to be limiting.

[0035] The embodiment of the present application provides a nuclear waste treatment method, such as Figure 1 As shown in the figure, the nuclear waste treatment method comprises the following steps: S1, starting a fan of a dust removal device to form a negative pressure in a cutting room of a cutting device; S2, starting a laser cutting machine of the cutting device to perform a cutting operation in the cutting room, and the fan continuously operates to provide suction to suck dust in the cutting room out when the cutting operation is performed; and S3, after the laser cutting machine stops operating, the fan is delayed to operate and then stops.

[0036] The nuclear waste treatment method has the following advantages: the fan of the dust removal device is started, the fan provides suction to suck air in the cutting room of the cutting device out, thereby forming a negative pressure in the cutting room, then the laser cutting machine of the cutting device is started to perform a cutting operation in the cutting room, the fan continuously operates to provide suction to suck dust in the cutting room out when the cutting operation is performed, and the fan is delayed to operate and then stops after the laser cutting machine stops operating, the fan is delayed to operate compared with the laser cutting machine, dust possibly remaining in the cutting room is sucked out, the content of the remaining dust in the cutting room is reduced, and the probability that the remaining dust in the cutting room diffuses to pollute the environment is reduced. The fan is started to operate before the laser cutting machine, air in the cutting room is sucked out in advance, and the situation that dust diffuses out of the cutting room to pollute the environment when the cutting starts is avoided. The nuclear waste treatment method provided by the present application has the advantages that the fan is started to operate before the laser cutting machine, the situation that dust diffuses out of the cutting room to pollute the environment when the cutting starts is avoided, the fan is stopped to operate after the laser cutting machine, dust remaining in the cutting room is further sucked out, and the content of the remaining dust in the cutting room is reduced by controlling the starting time and the stopping time of the fan, thereby reducing the risk of diffusion of the remaining dust.

[0037] In some embodiments, in step S1, the fan and an air outlet of the cutting room are connected, and a protective net is arranged at the air outlet to prevent foreign matters from entering the fan. By arranging the protective net at the air outlet, foreign matters with a large size in the cutting room are prevented from entering the fan to damage the fan or other equipment of the dust removal device.

[0038] In some embodiments, as shown in the figure, Figure 2As shown, in step S1, after the fan has run for a first preset time, the pressure difference between the pressure inside and outside the cutting chamber is calculated. If the pressure difference is negative, it is determined that negative pressure has formed inside the cutting chamber; if the pressure difference is 0 or positive, it is determined that negative pressure has not formed inside the cutting chamber, and an alarm is triggered to remind the operator to inspect the airtightness of the cutting chamber. After the fan has run for a first preset time, the pressure inside the cutting chamber is measured by a pressure sensor installed inside the cutting chamber, and the pressure outside the cutting chamber is measured by a pressure sensor installed outside the cutting chamber. The pressure difference is obtained by subtracting the pressure outside the cutting chamber from the pressure inside the cutting chamber. The sign of the pressure difference determines whether negative pressure has formed inside the cutting chamber. If the pressure difference is negative, meaning the difference between the pressure inside and outside the cutting chamber is negative, it indicates that the pressure inside the cutting chamber is less than the pressure outside, thus indicating a negative pressure has formed inside the cutting chamber. If the pressure difference is positive or 0, meaning the difference between the pressure inside and outside the cutting chamber is positive or 0, it indicates that the pressure inside the cutting chamber is greater than or equal to the pressure outside, thus indicating that no negative pressure has formed inside the cutting chamber, meaning the gas inside the cutting chamber is still connected. In this case, an alarm will be triggered to prompt personnel to check the airtightness of the cutting chamber.

[0039] Specifically, such as Figure 2 As shown, when the calculated differential pressure value is negative, after the fan runs for a second preset time, the current differential pressure value is calculated again to determine whether the difference between the current differential pressure value and the previous differential pressure value is within a preset range. If the difference is within the preset range, the differential pressure in the cutting room is considered stable, and step S2 is executed. If the difference is not within the preset differential pressure range, the differential pressure in the cutting room is considered unstable, and the process returns to determine whether the difference between the current differential pressure value and the previous differential pressure value is within the preset range. By calculating the sign of the differential pressure value, it is determined whether a negative pressure has formed in the cutting room. Only when a stable negative pressure has formed in the cutting room can the cutting operation begin. By determining whether the difference between the current differential pressure value and the previous differential pressure value is within the preset range, it is determined whether the negative pressure in the cutting room is stable. When the difference is within the preset range, it indicates that the fluctuation between the current differential pressure value and the previous differential pressure value is not significant. At this time, it is determined that the differential pressure in the cutting room has stabilized, and step S2 can be executed to carry out the cutting operation. If the difference is outside the preset range, it indicates that the current pressure difference fluctuates greatly compared to the previous pressure difference. In this case, the pressure difference in the cutting room is considered unstable, and the process is repeated to check whether the difference between the current and previous pressure differences is within the preset range. This process is repeated multiple times until the difference is found to be within the preset range. Experimental results show that a stable negative pressure is formed in the cutting room after the dust removal fan has been running for 2 minutes.

[0040] In some embodiments, such as Figure 1As shown, before starting the laser cutting machine, it is determined whether the current cutting piece meets the cutting condition; if the cutting condition is met, the laser cutting machine is started for cutting operation; if the cutting condition is not met, the foreign matter on the current cutting piece is removed or the cutting piece is replaced. After the determination in step S1 is completed, i.e., it is determined that the negative pressure is formed in the cutting room, it is then determined whether the current cutting piece meets the cutting condition and can be cut, if the cutting piece meets the cutting condition, the laser cutting machine can be started for cutting operation; if the cutting piece does not meet the cutting condition, the foreign matter on the current cutting piece is removed to meet the cutting condition, or the cutting piece is replaced to meet the cutting condition.

[0041] In some embodiments, after it is determined that the cutting piece meets the cutting condition, it is determined whether the production line conveying the cutting piece meets the conveying condition, if the conveying condition is met, the production line is started to convey the cutting piece to the laser cutting machine; if the conveying condition is not met, the foreign matter on the production line is removed. It can be understood that the production line is operated for a certain time, and then it is determined whether the production line meets the conveying condition. Specifically, the production line is operated for 1 minute.

[0042] In some embodiments, after it is determined that the current cutting piece meets the cutting condition, it is determined whether the laser cutting machine can operate normally; if the laser cutting machine can operate normally, the laser cutting machine is started for cutting operation; if the laser cutting machine cannot operate normally, an alarm is given to remind the operator to repair the laser cutting machine. After it is determined that the current cutting piece meets the cutting condition, before starting the cutting operation, it is further determined whether the laser cutting machine can operate normally, if the laser cutting machine can operate normally, it means that the laser cutting machine can operate normally according to the preset requirement, so the laser cutting machine can be started for cutting operation; if the laser cutting machine cannot operate normally, an alarm is given to remind the operator to repair the laser cutting machine.

[0043] Specifically, when it is determined whether the laser cutting machine can operate normally, the mechanical structure of the laser cutting machine is first detected, and it is determined whether the mechanical structure is complete, if the mechanical structure is complete, it is further determined whether the operation program is in error, if the mechanical structure is not complete, the laser cutting machine is repaired.

[0044] More specifically, when the mechanical structure of the laser cutting machine is detected, it can be observed by artificial naked eye or detected by mechanical equipment, if the mechanical structure is complete, it means that the structure can operate normally, and the next step of determining whether the operation program is in error is continued, if the mechanical structure is not complete, it means that the structure can operate normally, and the laser cutting machine is repaired until the mechanical structure of the laser cutting machine is complete.

[0045] More specifically, when determining whether the operation of the laser cutting machine is in error, the plurality of modules of the laser cutting machine are independently started, and it is determined whether each module can normally operate, so that it is determined that each module can normally operate independently. After the plurality of modules are all detected to be normal, the plurality of modules are cooperated to perform the whole machine linkage detection, and it is determined whether the plurality of modules can cooperate to perform the cutting operation. When the whole machine linkage detection is passed, it indicates that the plurality of modules can cooperate, so that the cutting operation is realized. At this time, it can be determined that the laser cutting machine can normally operate.

[0046] In some embodiments, in step S2, after the protection operation function of the controller of the laser cutting machine is started for a fifth preset time, the cutting operation is started. The protection operation function includes overload, short circuit, and open phase functions. After it is determined that the laser cutting machine can normally operate, the laser cutting machine is started. After the protection operation function of the controller of the laser cutting machine is started for a fifth preset time, the protection operation function is started, so that the overloading, short circuit, or open phase of the circuit of the laser cutting machine is prevented. After the protection operation function is started, the cutting operation can be started. Specifically, the fifth preset time is 0.5 minutes.

[0047] In some embodiments, as shown in Figure 1 During the cutting operation, the transportation speed of the workpiece to be cut, the cutting efficiency of the laser cutting machine, the pressure in the cutting room, the pressure outside the cutting room, and the dust concentration in the cutting room are monitored in real time. After it is determined that the laser cutting machine can normally operate, the cutting operation can be started. During the cutting operation, the transportation speed of the workpiece to be cut, the cutting efficiency of the laser cutting machine, the pressure in the cutting room, the pressure outside the cutting room, and the dust concentration in the cutting room are monitored in real time. The pressure in the cutting room and the pressure outside the cutting room are used to determine whether the negative pressure in the cutting room is stable. The dust concentration in the cutting room is used to determine the working efficiency of the fan of the dust removal device.

[0048] In some embodiments, as shown in Figure 1 In step S3, after the cutting device stops operating, the remaining devices of the dust removal device except the fan are operated for a third preset time and then stopped. After the remaining devices are stopped, the fan is operated for a fourth preset time and then stopped. That is, after the laser cutting machine finishes cutting, that is, after the cutting operation stops, each component of the cutting device is stopped. The remaining devices of the dust removal device except the fan are operated for a third preset time and then stopped. At this time, the remaining devices of the dust removal device except the fan are operated for a further time to further remove the dust in the cutting room. The dust in the cutting room is further sucked into the dust removal device. After the remaining devices are stopped, the fan is operated for a fourth preset time and then stopped, so as to reduce the residual dust in the area below the fan in the dust removal device.

[0049] That is, the fan is started before the laser cutting machine, and is stopped after the rest of the dust removal device except the fan is stopped. After the laser cutting machine is stopped, the rest of the dust removal device except the fan is delayed for a third preset time, and the fan is delayed for the third preset time plus a fourth preset time. In some embodiments, the third preset time is 10 minutes, and the fourth preset time is 1 minute. After the laser cutting machine is stopped, the rest of the dust removal device except the fan is delayed for 10 minutes, and the fan is delayed for 11 minutes in total.

[0050] Specifically, after the fan is stopped, real-time monitoring is also stopped. After the fan is stopped, it is indicated that the dust removal device is also completely stopped, and at this time, real-time detection is stopped.

[0051] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not contradict, they should be considered within the scope of the present disclosure.

[0052] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. A method for treating nuclear waste, characterized in that, include: S1. Turn on the dust removal device's fan to create negative pressure inside the cutting chamber of the cutting device; S2. Turn on the laser cutting machine of the cutting device and let the laser cutting machine perform cutting operations in the cutting room. During the cutting operation, the fan runs continuously to provide suction to extract the dust in the cutting room. S3. After the laser cutting machine stops operating, the fan runs for a delayed period of time before stopping. In step S1, after the fan has been running for a first preset time, the pressure difference between the pressure inside the cutting room and the pressure outside the cutting room is calculated. If the pressure difference value is negative, it is determined that a negative pressure has been formed in the cutting room; If the pressure difference is 0 or positive, it is determined that no negative pressure has been formed in the cutting room, and an alarm is triggered to remind the operator to check the airtightness of the cutting room. When the calculated differential pressure value is negative, the fan runs for a second preset time, and then the current differential pressure value is calculated again to determine whether the difference between the current differential pressure value and the previous differential pressure value is within a preset range. If the difference is within the preset range, it is determined that the pressure difference in the cutting room is stable, and step S2 is executed. If the difference is not within the preset range, it is determined that the pressure difference in the cutting room is unstable, and the process returns to determine again whether the difference between the current pressure difference value and the previous pressure difference value is within the preset range.

2. The nuclear waste treatment method according to claim 1, characterized in that, Before starting the laser cutting machine, determine whether the workpiece to be cut meets the cutting conditions; If the cutting conditions are met, the laser cutting machine is turned on to perform the cutting operation; If the cutting conditions are not met, remove the foreign objects from the current workpiece to be cut or replace the workpiece.

3. The nuclear waste treatment method according to claim 2, characterized in that, After determining that the workpiece to be cut meets the cutting conditions, it is determined whether the laser cutting machine can operate normally. If the laser cutting machine is operating normally, then turn on the laser cutting machine to perform the cutting operation; If the laser cutting machine malfunctions, an alarm will be triggered to remind the operator to inspect and repair the machine.

4. The nuclear waste treatment method according to claim 3, characterized in that, During the cutting operation, the transport speed of the workpiece to be cut, the cutting efficiency of the laser cutting machine, the pressure inside the cutting chamber, the pressure outside the cutting chamber, and the dust concentration inside the cutting chamber are monitored in real time.

5. The nuclear waste treatment method according to claim 4, characterized in that, The real-time monitoring will be stopped after the fan stops.

6. The nuclear waste treatment method according to claim 1, characterized in that, In step S3, after the cutting device stops operating, the remaining equipment of the dust removal device, except for the fan, runs for a third preset time and then stops. After the remaining equipment stops, the fan runs for a fourth preset time and then stops.

7. The nuclear waste treatment method according to claim 1, characterized in that, In step S1, the fan and the air outlet of the cutting room are connected first, and a protective net is installed at the air outlet to prevent foreign objects from entering the fan.

8. The nuclear waste treatment method according to claim 1, characterized in that, In step S2, the cutting operation begins after the protection operation function of the controller of the laser cutting machine is activated for a fifth preset time. The protection operation function includes overload, short circuit, and phase loss functions.

Images