A negative pressure conveying device and method for radioactive waste resin

Abstract

The patent of the present invention relates to a negative pressure conveying device and method for radioactive waste resin, which belongs to the field of radioactive waste treatment. On the nuclear island side, it includes a waste resin buffer treatment unit A, a vacuum unit A, a resin transfer unit A, a wastewater discharge unit and a wastewater discharge auxiliary unit, and in the waste treatment center, it includes a waste resin buffer treatment unit B, a vacuum unit B, a resin transfer unit B, a wastewater recovery unit and a wastewater recovery auxiliary unit. The main conveying method is: the radioactive waste resin in the waste resin storage tank is conveyed to the 1# waste resin buffer tank; vacuum is established in the transport tank of the transport tank truck; the resin is conveyed from the waste resin buffer tank to the transport tank of the transport tank truck; the resin conveying pipeline is flushed and purged; wastewater is discharged; abnormal situation is handled. The present invention solves the problem of radioactive aerosol leakage during resin transportation, reduces the risk of radioactive liquid leakage at the quick interface position, and improves efficiency.

Description

Technical Field

[0001] The invention patent relates to a negative pressure conveying device and method for radioactive waste resin, belonging to the field of radioactive waste treatment. Background Art

[0002] In order to minimize the radioactive waste in nuclear facilities, the radioactive solid waste is processed and prepared to meet the transportation requirements of radioactive waste packages and the reception requirements of the disposal site. The nuclear facility operating unit has built an off-reactor waste treatment facility (referred to as the waste treatment center) to treat the radioactive waste generated during the operation of the nuclear power plant units. The radioactive waste resin (nuclear island side) generated during the operation of the unit is first stored in the waste resin storage tank, and after temporary decay, the waste resin is transported to the transport tank truck through pipelines and quick connectors. After being transported to the waste treatment center by the transport tank truck, the waste resin is transported to the waste resin receiving tank of the waste treatment center through pipelines and quick connectors, and then the waste resin is metered, dried, compressed and other volume reduction treatments are carried out. This transportation method has the following defects:

[0003] 1. The resin in the waste resin storage tank on the nuclear island side is transported by a delivery pump as the power, and the waste resin is transported to the transport tank truck through pipelines and quick connectors. During the transportation process, the pipeline is in a positive pressure state, and there is a risk of leakage of radioactive liquid and radioactive aerosol at the quick connector position, which will lead to the spread of radioactive contamination and the risk of radioactive contamination and internal exposure of personnel, and will also cause great harm to the environment.

[0004] 2. The resin in the tank truck transported at the waste treatment center is also powered by a delivery pump, which delivers the waste resin to the waste resin receiving tank through pipelines and quick connectors. During the transportation process, the pipeline is also in a positive pressure state, and there is also the risk of leakage of radioactive liquids and radioactive aerosols at the quick connector position, which will lead to the spread of radioactive contamination and the risk of radioactive contamination and internal exposure of personnel, and will also cause great harm to the environment.

[0005] 3. The transport tank truck is connected to the interface box on the nuclear island side and the interface box of the waste treatment center through a telescopic hose and its quick interface to realize resin transportation. This positive pressure transportation method must ensure that the telescopic hose is placed horizontally during resin transportation, and the pipeline curvature radius is not less than 5 times the pipeline diameter. Otherwise, the resin will block the hose, the pressure in the pipeline will increase rapidly, and the resin transmission cannot be completed. Under high pressure, the resin in the pipe will leak from the quick interface, causing the spread of radioactive contamination and the risk of radioactive contamination of personnel. Once the pipeline is blocked, it will not only affect the daily production of the power plant, but also make it very difficult to dredge the pipeline, and it will greatly increase the radioactive dose of the staff.

[0006] 4. Since the telescopic hose must be placed horizontally during resin transportation, the floor space of the transport vehicle and its transport area and the plant building area must be large enough, and its length should not be less than 12 meters;

[0007] In order to reduce the risk of leakage of radioactive resin and its radioactive materials at the quick interface, this transportation method requires necessary leakage detection and sealing tests on the delivery pipeline and quick interface after each connection of the quick interface and before resin transportation. The detection process is cumbersome and time-consuming, which affects on-site work efficiency. Summary of the invention

[0008] Purpose:

[0009] The invention relates to a negative pressure conveying device and method for radioactive waste resin, which is mainly characterized in that a negative pressure state is maintained in the pipeline during the conveying process, which essentially solves the problem of a positive pressure state in the pipeline during the conveying process, essentially solves the problem of radioactive aerosol leakage during the resin conveying process, reduces the risk of radioactive liquid leakage at the quick interface position, and when the resin is conveyed, the radius of curvature of the telescopic hose pipeline is not less than 2 times the diameter of the pipeline, and the pipeline will not be blocked, so the resin can be smoothly conveyed; the conveying time of the resin under the negative pressure state is shortened by more than 3 times than that under the positive pressure state. At the same time, since the conveying system is in a negative pressure state, the sealing of the conveying pipeline and the quick interface can be judged by vacuum monitoring before the resin is transmitted, and there is no need to use desalted water and compressed air for special leakage detection and sealing test, which greatly improves the work efficiency.

[0010] Technical solution:

[0011] In order to solve the above technical problems, the present invention designs a negative pressure conveying device and method for radioactive waste resin, which is mainly characterized in that it includes a waste resin buffer treatment unit A, a vacuum unit A, a waste resin transmission unit A, a wastewater discharge unit and a wastewater discharge auxiliary unit on the nuclear island side, and includes a waste resin buffer treatment unit B, a vacuum unit B, a waste resin transmission unit B, a wastewater recovery unit and a wastewater recovery auxiliary unit in the waste treatment center.

[0012] A negative pressure conveying device for radioactive waste resin is distributed on the nuclear island side and the waste treatment center, wherein the nuclear island side includes a waste resin buffer treatment unit A, a vacuum unit A, a waste resin transmission unit A, a wastewater discharge unit and a wastewater discharge auxiliary unit; the waste treatment center includes a waste resin buffer treatment unit B, a vacuum unit B, a waste resin transmission unit B, a wastewater recovery unit and a wastewater recovery auxiliary unit.

[0013] The waste resin buffer processing unit A comprises a 1# waste resin buffer tank (3), a 1# waste resin buffer tank inlet valve (2), a 1# waste resin buffer tank outlet valve (4), a waste resin conveying isolation valve A (26), an isolation valve A (5), a 1# sight glass (6) and pipelines thereof; one end of the 1# waste resin buffer tank inlet valve (2) is connected to the resin conveying pump outlet valve (1) and the waste resin conveying isolation valve A (26) through a pipeline, the other end of the 1# waste resin buffer tank inlet valve (2) is connected to the top of the 1# waste resin buffer tank (3) in the form of a flange through a pipeline, the bottom of the 1# waste resin buffer tank (3) is connected to the 1# waste resin buffer tank outlet valve (4) through a pipeline, the other end of the 1# waste resin buffer tank outlet valve (4) is connected to the waste resin conveying isolation valve A (26) and the isolation valve A (5) through a pipeline, and the isolation valve A (5) is connected to the 1# sight glass (6) through a pipeline.

[0014] The vacuum unit A comprises a filter A, an exhaust outlet valve of a transport tank truck, a 1# gas-water separator, a valve A, a telescopic hose B, a quick interface valve of a transport tank truck, a quick interface valve of an interface box, a 1# vacuum pump inlet valve, a 1# vacuum pump, a 1# vacuum pump outlet valve, a filter B, an exhaust valve A, a 1# vacuum pump bypass valve and its pipeline; the filter A is installed on the top of the storage tank of the transport tank truck and is connected to the exhaust outlet valve of the transport tank truck through a pipeline, the exhaust outlet valve of the transport tank truck is connected to the 1# gas-water separator through a pipeline, the gas side of the 1# gas-water separator is connected to the valve A through a pipeline, and the water side of the 1# gas-water separator is connected to the valve A through a pipeline. It is connected to the resin outlet valve of the transport tank truck through a pipeline, valve A is connected to the telescopic hose B through a pipeline, telescopic hose B is connected to the quick interface valve B of the transport tank truck, the quick interface valve B of the interface box is connected to the inlet valve of 1# vacuum pump through a pipeline, the inlet valve of 1# vacuum pump is connected to 1# vacuum pump and 1# vacuum pump bypass valve through a pipeline, 1# vacuum pump is connected to the outlet valve of 1# vacuum pump through a pipeline, the outlet valve of 1# vacuum pump is connected to the bypass valve of 1# vacuum pump and filter B through a pipeline, filter B is connected to exhaust valve A through a pipeline, and exhaust valve A is connected to the exhaust purification system of plant equipment through a pipeline.

[0015] The vacuum unit B comprises a filter C, a 2# gas-water separator, a valve D, a 2# vacuum pump inlet valve, a 2# vacuum pump, a 2# vacuum pump outlet valve, a filter D, an exhaust valve B, a 2# vacuum pump bypass valve, a valve E, an interface box quick interface valve E and its pipeline; the filter C is installed on the top of the 2# waste resin buffer tank to prevent the resin from being drawn into the pipeline and clogging the pipeline during vacuum pumping, and is connected to the 2# gas-water separator through a pipeline, the 2# gas-water separator is connected to the valve D through a pipeline, the valve D is respectively connected to the 2# vacuum pump inlet valve, the 2# vacuum pump bypass valve and the valve E, the 2# vacuum pump inlet valve is connected to the 2# vacuum pump through a pipeline, the 2# vacuum pump is connected to the 2# vacuum pump outlet valve through a pipeline, the 2# vacuum pump outlet valve is respectively connected to the 2# vacuum pump bypass valve and the filter D, the filter D is connected to the exhaust valve B through a pipeline, the exhaust valve B is connected to the plant equipment exhaust purification system, and the valve E is connected to the interface box quick interface valve E through a pipeline.

[0016] The waste resin buffer processing unit B includes an interface box quick interface valve D, a 2# sight glass, a 2# waste resin buffer tank inlet valve, a 2# waste resin buffer tank, a 2# waste resin buffer tank outlet valve, a waste resin delivery pump inlet valve, a waste resin delivery pump, a waste resin delivery pump outlet, a waste resin receiving tank, a waste resin receiving tank outlet valve, a waste resin metering pump inlet valve, a waste resin metering pump, a waste resin metering pump outlet valve and pipelines thereof; the interface box quick interface valve is installed in the 2# interface box, connected to the 2# sight glass through a pipeline, the 2# sight glass is connected to the 2# waste resin buffer tank inlet valve through a pipeline, the 2# waste resin buffer tank inlet valve is connected to the 2# waste resin buffer tank through a pipeline and a flange, and the bottom of the 2# waste resin buffer tank is connected to the 2# waste resin buffer tank through a pipeline. #The outlet valve of the waste resin buffer tank is connected, the outlet valve of the 2# waste resin buffer tank is connected to the inlet valve of the resin delivery pump through a pipeline, the inlet valve of the waste resin delivery pump is connected to the waste resin delivery pump through a pipeline, the waste resin delivery pump is connected to the outlet of the waste resin delivery pump through a pipeline, the outlet of the waste resin delivery pump is connected to the waste resin receiving tank through a pipeline and a flange, a filter is arranged in the waste resin receiving tank to separate resin and water, a pipeline at the bottom of the waste resin receiving tank leads to the resin side, and is connected to the outlet valve of the waste resin receiving tank through a pipeline, the outlet valve of the waste resin receiving tank is connected to the inlet valve of the waste resin metering pump through a pipeline, the inlet valve of the waste resin metering pump is connected to the waste resin metering pump through a pipeline, and the waste resin delivery pump is connected to the outlet valve of the waste resin metering pump through a pipeline.

[0017] The vacuum degree in the transport tanker storage tank (12), the No. 1 waste resin buffer tank (3), and the No. 2 waste resin buffer tank (50) is -(30 to 600) KPa.

[0018] The device includes two parts: the nuclear island side and the waste treatment center side. The negative pressure transportation method of radioactive waste resin on the nuclear island side includes:

[0019] Step 1: The radioactive waste resin in the waste resin storage tank is transported to the 1# waste resin buffer tank; Step 2: A vacuum is established in the transport tank of the transport tank truck; Step 3: The resin is transported from the 1# waste resin buffer tank to the transport tank of the transport tank truck; Step 4: The resin transport pipeline is flushed and purged; Step 5: Wastewater discharge; Step 6: Abnormal situation handling;

[0020] The negative pressure conveying method of radioactive waste resin at the waste treatment center side includes: step one: establishing vacuum in 2# waste resin buffer tank; step two: conveying the radioactive waste resin in the storage tank of the transport tank truck to 2# waste resin buffer tank; step three: conveying the waste resin from 2# waste resin buffer tank to the waste resin receiving tank; step four: conveying the waste resin from the waste resin receiving tank to the waste resin metering tank for treatment; step five: draining the waste resin receiving tank; step six: recycling the waste water from the waste resin receiving tank when the water in the flushing tank needs to be recycled; step seven: flushing and purging the waste resin conveying pipeline; step eight: discharging wastewater and flushing the pipeline; step nine: handling abnormal situations.

[0021] Step 1 of the negative pressure transport method for radioactive waste resin on the nuclear island side: The radioactive waste resin in the waste resin storage tank is transported to the 1# waste resin buffer tank:

[0022] ① After the radioactive waste resin in the waste resin storage tank decays for a certain period of time, the outlet valve of the waste resin delivery pump and the inlet valve of the 1# waste resin buffer tank are opened to deliver the waste resin to the waste resin buffer tank;

[0023] ② The liquid level switch of the 1# waste resin buffer tank is interlocked with the signal of the waste resin delivery pump to prevent overflow of the 1# waste resin buffer tank. After the delivery is completed, the resin delivery pump is stopped and the outlet valve of the waste resin delivery pump and the inlet valve of the 1# waste resin buffer tank are automatically closed.

[0024] Step 2 of the negative pressure transport method for radioactive waste resin on the nuclear island side: Establishing vacuum in the transport tank of the transport tanker:

[0025] ① The transport tank truck quick interface valve B, transport tank truck quick interface valve A, and transport tank truck quick interface valve C in the transport tank truck are respectively connected to the interface box quick interface valve B, 1# interface box quick interface valve A, and 1# interface box quick interface valve C in the 1# interface box through the telescopic hose B, telescopic hose A, and telescopic hose C;

[0026] ②Open the transport tank truck quick interface valve B, transport tank truck quick interface valve A, transport tank truck quick interface valve C, 1# interface box quick interface valve B, interface box quick interface valve A, interface box quick interface valve C;

[0027] ③Open valve C in the transport tank truck, the resin inlet valve of the transport tank truck storage tank, the exhaust outlet valve of the transport tank truck, valve A, isolation valve B, deionized water flushing inlet valve, the drain outlet valve of the transport tank truck storage tank, and valve B;

[0028] ④Open the vacuum unit 1# vacuum pump inlet valve and 1# vacuum pump outlet valve, and open the exhaust valve A;

[0029] ⑤ Start the 1# vacuum pump to evacuate the transport tank of the transport tank truck. The air in the tank truck is discharged into the exhaust purification system of the plant equipment after passing through the 1# resin filter, the exhaust outlet valve of the transport tank truck, the 1# gas-water separator, valve A, the quick interface valve B of the transport tank truck, the quick interface valve B of the interface box, and the 1# air filter. When the pressure gauge value in the transport tank of the transport tank truck reaches the set pressure, the 1# vacuum pump stops automatically and closes the 1# vacuum pump inlet valve and the 1# vacuum pump outlet valve;

[0030] ⑥ The vacuum pressure in the tank of the transport tank truck remains stable. If there is no change in pressure after 10 to 20 seconds, it means that the quick connector and its pipeline are well sealed.

[0031] Step 1 of the negative pressure conveying method for radioactive waste resin at the waste treatment center: Establish vacuum in the 2# waste resin buffer tank:

[0032] ① The transport tank truck quick interface valve B, transport tank truck quick interface valve A, and transport tank truck quick interface valve C in the transport tank truck are respectively connected to the interface box quick interface valve E, interface box quick interface valve D, and interface box quick interface valve F in the 2# interface box of the waste treatment center through the telescopic hose B, telescopic hose A, and telescopic hose C;

[0033] ②Open the transport tank truck quick interface valve A, transport tank truck quick interface valve B, transport tank truck quick interface valve C, interface box quick interface valve D, interface box quick interface valve E, interface box quick interface valve F;

[0034] ③Open the inlet valve, valve D and valve E of the 2# waste resin buffer tank;

[0035] ④Open the inlet valve and outlet valve of the 2# vacuum pump of the 2# vacuum unit, and open the exhaust valve B;

[0036] ⑤ Start the 2# vacuum pump to evacuate the 2# waste resin buffer tank. The air in the 2# waste resin buffer tank is discharged into the plant equipment exhaust purification system after passing through the resin filter, gas-water separator, valve D, 2# vacuum pump inlet valve, 2# vacuum pump outlet valve, 2# air filter and exhaust valve B. When the pressure gauge value in the 2# waste resin buffer tank reaches the set pressure, the 2# vacuum pump automatically stops and closes the 2# vacuum pump inlet valve and 2# vacuum pump outlet valve;

[0037] ⑥The vacuum pressure in the 2# waste resin buffer tank remains stable. If there is no change in pressure after 10 to 20 seconds, it means that the quick connector and its pipeline are well sealed.

[0038] Step 2 of the negative pressure transport method for radioactive waste resin at the waste treatment center: transport the radioactive waste resin in the resin inlet valve of the tanker to the 2# waste resin buffer tank:

[0039] 1. Open the resin outlet valve and valve C of the transport tank truck;

[0040] 2. Under the action of negative pressure, the mixture of resin and water in the tank of the transport tanker is transported to the 2# waste resin buffer tank through the pipeline. During this period, the resin transportation status and the status of completion of transportation can be observed through the 2# sight glass, and the resin transportation status can be judged by the resin liquid level in the buffer tank and the liquid level in the transport tanker;

[0041] 3. Close the resin outlet valve and valve C of the transport tank truck to complete the resin delivery.

[0042] Beneficial effects:

[0043] The present invention designs a negative pressure conveying device and method for radioactive waste resin, the main innovations of which are:

[0044] a) The present invention designs a waste resin buffer treatment unit and a vacuum unit on the nuclear island side and the waste treatment center side respectively. Its main feature is that the pipeline is in a negative pressure state during the resin transportation process, which essentially solves the problem of positive pressure state in the pipeline during the transportation process, and essentially solves the problem of radioactive aerosol leakage during the resin transportation process, reduces the risk of radioactive liquid leakage at the quick interface position, and improves the safety and reliability of the system.

[0045] b) The present invention designs a negative pressure conveying device and method for radioactive waste resin. Since the pipeline is in a negative pressure state during the resin conveying process, the curvature radius of the telescopic hose pipeline is not less than 2 times the diameter of the pipeline during resin conveying, and the pipeline will not be blocked. The resin conveying can be completed smoothly, thereby improving the safety and stability of the system.

[0046] c) The present invention designs a negative pressure conveying device and method for radioactive waste resin. The resin conveying time under negative pressure is shortened by more than 3 times than that under positive pressure. At the same time, since the conveying system is in a negative pressure state, the sealing performance of the conveying pipeline and the quick interface can be determined by vacuum monitoring before the resin is transmitted. There is no need to use desalted water and compressed air for special leakage detection and sealing test, which greatly improves work efficiency.

[0047] d) The present invention designs a negative pressure conveying device for radioactive waste resin. The exhaust gas generated during vacuuming passes through a filter unit and is then discharged to a plant equipment exhaust purification system for monitoring and emission compliance, which will not cause pollution to the environment. At the same time, a gas-water separator is designed on the pipeline connected to the vacuum unit, and resin filters are set at the exhaust outlet of the transport tanker storage tank and the exhaust outlet of the 2# waste resin buffer tank to prevent water and waste resin in the transport tanker storage tank from entering the exhaust pipeline under the action of negative pressure, thereby ensuring the effective establishment of vacuum and improving the safety and reliability of the system.

[0048] e) The effective volume of the 1# waste resin buffer tank and the 2# waste resin buffer tank designed by the present invention is 1.2 to 1.5 cubic meters, which is the same as the effective volume of the transport tank truck storage tank, ensuring that all the resin in the 1# waste resin buffer tank is transported to the transport tank truck storage tank in a single time, and also that all the resin in the transport tank truck storage tank is transported to the 2# waste resin buffer tank, thereby ensuring the safety and reliability of the system.

[0049] f) The vacuum unit designed by the present invention has a vacuum degree of -(30-60) KPa in the transport tanker storage tank and the 1# and 2# waste resin buffer tanks, thereby ensuring the safety and reliability of the system.

[0050] g) The present invention designs a drainage pump on the nuclear island side of the unit, which is connected to the bottom of the storage tank of the transport tank truck through pipelines, quick connectors, and hoses. When draining water, the excess water in the storage tank is drained to the waste resin storage tank by pumping water from the storage tank of the transport tank truck.

[0051] h) The wastewater recovery unit designed in the present invention can recover the wastewater in the flushing gutter into the storage tank of the transport tank truck.

[0052] i) The design of the present invention can realize the function of positive pressure transportation while realizing negative pressure transportation of waste resin.

[0053] j) The design of the present invention has the function of flushing and purging the 1# and 2# waste resin buffer tanks and their transmission pipelines with deionized water and compressed air, thereby ensuring the effective and safe transmission of the radioactive waste resin.

[0054] In the system designed by the present invention, if liquid leakage occurs at the quick interface during the transportation process, the waste liquid can be collected through the interface box and discharged to the special sewage discharge collection system of the factory building. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 This is a schematic diagram of the process of the patented invention "A negative pressure conveying device for radioactive waste resin" (nuclear island side).

[0056] Figure 2 This is a schematic diagram of the process of the patent "A negative pressure conveying device for radioactive waste resin" (waste treatment center side) of this invention.

[0057] 1: Resin delivery pump outlet valve; 2: 1# waste resin buffer tank inlet valve; 3: 1# waste resin buffer tank; 4: 1# waste resin buffer tank outlet valve; 5: Isolation valve A; 6: 1# peephole; 7: Interface box quick interface valve A; 8: Transport tank truck quick interface valve A; 9: Telescopic hose A; 10: Valve C; 11: Transport tank truck storage tank resin inlet valve; 12: Transport tank truck storage tank; 13: Filter A; 14: Transport tank truck exhaust outlet valve; 15: 1# gas-water separator; 16: Valve A; 17: Telescopic hose B; 18: Transport tank truck quick interface valve B; 19: Interface box quick interface valve B; 20: 1# vacuum pump inlet valve; 21: 1# vacuum pump; 22: 1# vacuum pump outlet valve; 23: filter B; 24: exhaust valve A; 25: 1# vacuum pump bypass valve; 26: waste resin conveying isolation valve; 27: transport tanker storage tank resin outlet valve; 28: transport tanker storage tank resin discharge pipe; 29: isolation valve B; 30: desalted water flushing inlet valve: 31: transport tanker storage tank drainage outlet valve; 32: transport tanker storage tank water discharge pipe; 33: valve B; 34: telescopic hose C; 35: transport tanker quick interface valve C; 36: interface box quick interface valve C; 37: drainage pump inlet valve; 38: drainage pump; 39: drainage pump outlet valve; 40: 1# interface box; 41: drainage funnel 42: 1# Leakage water discharge valve of interface box; 43: desalted water isolation valve; 44: compressed air inlet valve; 45: check valve; 46: transport tank truck; 47: resin filter in the storage tank of transport tank truck; 48: 2# sight glass; 49: 2# waste resin buffer tank inlet valve; 50: 2# waste resin buffer tank; 51: filter C; 52: 2# gas-water separator; 53: valve D; 54: 2# vacuum pump inlet valve; 55: 2# vacuum pump; 56: 2# vacuum pump outlet valve; 57: filter D; 58: exhaust valve; 59: 2# vacuum pump bypass valve; 60: valve E; 61: interface box quick interface valve E; 62: 2# waste resin buffer tank outlet valve; 63: waste resin Delivery pump inlet valve; 64: waste resin delivery pump; 65: waste resin delivery pump outlet valve; 66: waste resin receiving tank; 67: waste resin receiving tank outlet valve; 68: waste resin metering pump inlet valve; 69: waste resin metering pump; 70: waste resin metering pump outlet valve; 71: flushing drain trough inlet valve; 72: flushing drain trough: 73: flushing drain trough outlet valve; 74: flushing drain pump inlet valve; 75: flushing drain pump; 76: flushing drain pump outlet valve; 77: flushing drain return valve; 78: valve F; 79: interface box quick interface valve F; 80: interface box quick interface valve D; 81: 2# interface box; 82: drainage funnel; 83: 2# interface box leakage water discharge valve. DETAILED DESCRIPTION

[0058] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0059] like Figure 1 As shown, the present invention provides a negative pressure conveying device for radioactive waste resin, the nuclear island side of the system includes a waste resin buffer treatment unit A, a vacuum unit A, a waste resin transmission unit A, a wastewater discharge unit and a wastewater discharge auxiliary unit; the waste treatment center includes a waste resin buffer treatment unit B, a vacuum unit B, a waste resin transmission unit B, a wastewater recovery unit and a wastewater recovery auxiliary unit.

[0060] A waste resin buffer unit A and a vacuum unit A are designed on the nuclear island side. First, the waste resin is transported from the waste resin storage tank to the 1# waste resin buffer tank through a delivery pump. At the same time, a vacuum unit is designed to be connected to the transport tanker tank exhaust pipeline. The vacuum pump is started to establish negative pressure in the tank in the transport tanker. The sealing of the delivery pipeline and the quick interface is judged by maintaining the negative pressure. Then the outlet valve of the 1# waste resin buffer tank is opened to form a pressure difference between the 1# waste resin buffer tank and the transport tanker tank. The resin in the 1# waste resin buffer tank is transported to the transport tanker tank through the delivery pipeline and the quick interface. The exhaust gas generated by the vacuum unit during vacuuming is discharged to the plant equipment exhaust purification system after passing through the filter unit, which will not cause pollution to the environment. A gas-water separation unit is designed on the pipeline connected to the vacuum unit, and a resin filter is set at the exhaust outlet of the transport tanker tank to prevent water and waste resin in the transport tanker tank from entering the exhaust pipeline under the action of negative pressure, ensuring the effective establishment of vacuum.

[0061] A waste resin buffer unit B and a vacuum unit B are designed in the waste treatment center. First, the vacuum pump of the vacuum unit B is started to establish negative pressure in the 2# waste resin buffer tank. The sealing performance of the delivery pipeline and the quick interface is judged by maintaining the negative pressure. Then, the valve C on the transmission pipeline is opened to form a pressure difference between the transport tanker storage tank and the 2# waste resin buffer tank. The pressure difference is judged by the pressure gauge of the 2# waste resin buffer tank. The resin in the transport tanker storage tank is transported to the 2# waste resin buffer tank through the delivery pipeline and the quick interface. The transmission status and the amount of resin transmitted are judged by the 2# sight glass on the transmission pipeline and the liquid level gauge of the 2# waste resin buffer tank. The exhaust gas generated by the vacuum unit during vacuuming is discharged to the plant equipment exhaust purification system after passing through the filter unit, which will not cause pollution to the environment. A gas and water separation unit is designed on the pipeline connected to the vacuum unit, and a resin filter is set at the exhaust outlet of the transport tanker storage tank to prevent the water and waste resin in the 2# waste resin buffer tank from entering the exhaust pipeline under the action of negative pressure, thereby ensuring the effective establishment of vacuum.

[0062] The waste resin buffer processing unit A includes a 1# waste resin buffer tank 3, a 1# waste resin buffer tank inlet valve 2, a 1# waste resin buffer tank outlet valve 4, a waste resin conveying isolation valve 26, an isolation valve A5 and pipelines thereof. The 1# waste resin buffer tank inlet valve 2 is connected to the resin conveying pump outlet valve 1 and the waste resin conveying isolation valve 26 through a pipeline, the 1# waste resin buffer tank inlet valve 2 is connected to the top of the 1# waste resin buffer tank 3 in the form of a flange through a pipeline, the bottom of the 1# waste resin buffer tank 3 is connected to the 1# waste resin buffer tank outlet valve 4 through a pipeline, and the 1# waste resin buffer tank outlet valve 4 is connected to the waste resin conveying isolation valve 26 and the isolation valve A5 through a pipeline;

[0063] The vacuum unit A includes a filter A13, an exhaust outlet valve 14 of a transport tank truck, a 1# gas-water separator 15, a valve A16, a telescopic hose B17, a quick interface valve B18 of a transport tank truck, a quick interface valve B19 of an interface box, a 1# vacuum pump inlet valve 20, a 1# vacuum pump 21, a 1# vacuum pump outlet valve 22, a filter B23, an exhaust valve A24, a 1# vacuum pump bypass valve 25 and pipelines thereof. Filter A13 is installed on the top of the tank 12 of the transport tank truck to prevent the resin from being drawn into the pipeline and blocking the pipeline when vacuuming. The filter A13 is connected to the exhaust outlet valve 14 of the transport tank truck through the pipeline. The exhaust outlet valve 14 of the transport tank truck is connected to the 1# gas-water separator 15 through the pipeline. The gas side of the 1# gas-water separator 15 is connected to the valve A16 through the pipeline. The water side of the 1# gas-water separator 15 is connected to the resin outlet valve 27 of the transport tank truck through the pipeline to prevent the water in the tank truck from being drawn into the pipeline and the vacuum unit to affect the establishment of vacuum. The valve A16 is connected to the telescopic hose B17 through the pipeline. The shrink hose B17 is connected to the quick interface valve B18 of the transport tank truck, the quick interface valve B19 of the interface box is connected to the 1# vacuum pump inlet valve 20 through a pipeline, the 1# vacuum pump inlet valve 20 is connected to the 1# vacuum pump 21 and the 1# vacuum pump bypass valve 25 through a pipeline, the 1# vacuum pump 21 is connected to the 1# vacuum pump outlet valve 22 through a pipeline, the 1# vacuum pump outlet valve 22 is connected to the 1# vacuum pump bypass valve 25 and the filter B23 through a pipeline, the filter B23 is connected to the exhaust valve A24 through a pipeline, and the exhaust valve A24 is connected to the exhaust purification system of the plant equipment through a pipeline.

[0064] The waste resin transfer unit A includes 1# peephole 6, interface box quick interface valve A7, transport tank truck quick interface valve A8, telescopic hose A9, valve C10, transport tank truck storage tank resin inlet valve 11, transport tank truck storage tank resin outlet valve 27, transport tank truck storage tank resin discharge pipe 28, transport tank truck storage tank 12 and its pipeline. During resin transmission, the isolation valve A5 is connected to the 1# sight glass 6, the 1# sight glass 6 is connected to the quick interface valve A7 of the interface box through a pipeline, the quick interface valve A8 of the transport tank truck is connected to the telescopic hose A9, the telescopic hose A9 is connected to the valve C10 through a pipeline, the valve C10 is connected to the transport tank truck tank resin inlet valve 11 and the transport tank truck tank resin outlet valve 27 through a pipeline, the transport tank truck tank resin inlet valve 11 is connected to the top of the transport tank truck tank 12 through a pipeline, the transport tank truck tank resin outlet valve 27 is extended to the bottom position of the transport tank truck tank 12 through a pipeline, and is close to the resin filter 47 in the transport tank truck tank, the transport tank truck tank 12 should have a shielding function, and a pressure gauge, resin liquid level monitoring and water level monitoring instruments are installed on the top of the transport tank truck tank 12. The diameter of the above pipelines should not be less than DN50.

[0065] The wastewater discharge unit includes a transport tank truck storage tank water discharge pipe 32, a desalted water flushing inlet valve 30, a transport tank truck storage tank drainage outlet valve 31, a transport tank truck storage tank water discharge pipe 32, a valve B33, a telescopic hose C34, a transport tank truck quick interface valve C35, an interface box quick interface valve C36, a drainage pump inlet valve 37, a drainage pump 38, a drainage pump outlet valve 39 and its pipelines. The water discharge pipe 32 of the transport tank truck storage tank is connected to the transport tank truck storage tank 12 through a pipeline and extends to its bottom (below the resin filter screen 47 in the transport tank truck storage tank), the desalted water flushing inlet valve 30 is connected to the transport tank truck storage tank 12 through a pipeline, the water discharge pipe 32 of the transport tank truck storage tank and the desalted water flushing inlet valve 30 are connected to valve B33 and isolation valve B29 through a pipeline, the isolation valve B29 is connected to the resin outlet valve 27 of the transport tank truck storage tank through a pipeline, the valve B33 is connected to the telescopic hose C34 through a pipeline, the interface box quick interface valve 36 is connected to the drain pump inlet valve 37 through a pipeline, the drain pump inlet valve 37 is connected to the drain pump 38 through a pipeline, and the drain pump 38 is connected to the drain pump outlet valve 39 through a pipeline.

[0066] The wastewater discharge auxiliary unit includes a 1# interface box 40, a drainage funnel 41, a 1# interface box leakage water discharge valve 42, a desalted water isolation valve 43, a compressed air inlet valve 44, a check valve 45, a transport tanker 46 and its pipelines. The drainage funnel 41 is connected to the bottom of the 1# interface box 40 and the 1# interface box leakage water discharge valve 42, the 1# interface box leakage water discharge valve 42 is connected to the plant special sewage discharge collection system through a pipeline, the desalted water isolation valve 43 is connected to the resin delivery pump outlet valve 1 and the waste resin delivery isolation valve 26 through a pipeline, the compressed air inlet valve 44 is connected to the check valve 45 through a pipeline, and the check valve 45 is connected to the 1# waste resin buffer tank outlet valve through a pipeline.

[0067] The vacuum unit B includes a filter C51, a 2# gas-water separator 52, a valve D53, a 2# vacuum pump inlet valve 54, a 2# vacuum pump 55, a 2# vacuum pump outlet valve 56, a filter D57, an exhaust valve B58, a 2# vacuum pump bypass valve 59, a valve E60, an interface box quick interface valve E61 and its pipelines. Filter C51 is installed on the top of 2# waste resin buffer tank 50 to prevent the resin from being drawn into the pipeline and clogging the pipeline when vacuuming, and is connected to 2# gas-water separator 52 through a pipeline, 2# gas-water separator 52 is connected to valve D53 through a pipeline, valve D53 is respectively connected to 2# vacuum pump inlet valve 54, 2# vacuum pump bypass valve 59 and valve E60, 2# vacuum pump inlet valve 54 is connected to 2# vacuum pump 55 through a pipeline, 2# vacuum pump 55 is connected to 2# vacuum pump outlet valve 56 through a pipeline, 2# vacuum pump outlet valve 56 is respectively connected to 2# vacuum pump bypass valve 59 and filter D57, filter D57 is connected to exhaust valve B58 through a pipeline, exhaust valve B58 is connected to the exhaust purification system of plant equipment, and valve E is connected to interface box quick interface valve E61 through a pipeline.

[0068] The waste resin buffer processing unit B includes an interface box quick interface valve D80, a 2# sight glass 48, a 2# waste resin buffer tank inlet valve 49, a 2# waste resin buffer tank 50, a 2# waste resin buffer tank outlet valve 62, a waste resin delivery pump inlet valve 63, a waste resin delivery pump 64, a waste resin delivery pump outlet 65, a waste resin receiving tank 66, a waste resin receiving tank outlet valve 67, a waste resin metering pump inlet valve 68, a waste resin metering pump 69, a waste resin metering pump outlet valve 70 and its pipelines. The interface box quick interface valve D80 is installed in the 2# interface box, connected to the 2# sight glass 48 through a pipeline, the 2# sight glass 48 is connected to the 2# waste resin buffer tank inlet valve 49 through a pipeline, the 2# waste resin buffer tank inlet valve 49 is connected to the 2# waste resin buffer tank 50 through a pipeline and a flange, the bottom of the 2# waste resin buffer tank 50 is connected to the 2# waste resin buffer tank outlet valve 62 through a pipeline, the 2# waste resin buffer tank outlet valve 62 is connected to the resin delivery pump inlet valve 63 through a pipeline, the resin delivery pump inlet valve 63 is connected to the resin delivery pump 64 through a pipeline, and the resin delivery pump 65 is connected to the resin delivery pump 66 through a pipeline. The outlet 65 of the resin delivery pump is connected to the waste resin receiving tank 66 through a pipeline, and the outlet 65 of the resin delivery pump is connected to the waste resin receiving tank 66 through a pipeline and a flange. A filter screen is arranged in the waste resin receiving tank 66 to separate resin and water. A pipeline at the bottom of the waste resin receiving tank 66 leads to the resin side and is connected to the outlet valve 67 of the waste resin receiving tank through a pipeline. The outlet valve 67 of the waste resin receiving tank is connected to the inlet valve 68 of the waste resin metering pump through a pipeline. The inlet valve 68 of the waste resin metering pump is connected to the waste resin metering pump 69 through a pipeline. The waste resin delivery pump 69 is connected to the outlet valve 70 of the waste resin metering pump through a pipeline.

[0069] A resin interface meter and a liquid level meter, as well as a pressure gauge and its mounting holes are provided on the top of the 2# waste resin buffer tank 50 and the waste resin receiving tank 66 .

[0070] The wastewater recovery unit includes a flushing and drainage trough inlet valve 71, a flushing and drainage trough 72, a flushing and drainage trough outlet valve 73, a flushing and drainage pump inlet valve 74, a flushing and drainage pump 75, a flushing and drainage pump outlet valve 76, a flushing and drainage return valve 77, a valve F, an interface box quick interface valve F79 and its pipelines. The flushing and drainage trough inlet valve 71 is connected to the bottom water side of the 2# waste resin buffer tank 50 and the top of the flushing and drainage trough 72 through a pipeline, the bottom of the flushing and drainage trough 72 is connected to the flushing and drainage trough outlet valve 73 through a pipeline, the flushing and drainage trough outlet valve 73 is connected to the flushing and drainage pump inlet valve 74 and the flushing and drainage return valve 77 through a pipeline, the flushing and drainage pump inlet valve 74 is connected to the flushing and drainage pump 75 through a pipeline, the flushing and drainage pump 75 is connected to the flushing and drainage pump outlet valve 76 through a pipeline, the flushing and drainage pump outlet valve 76 is connected to the plant special sewage discharge collection system through a pipeline, the flushing and drainage return valve 77 is connected to the valve F through a pipeline, and the valve F78 is connected to the interface box quick interface valve F79 through a pipeline;

[0071] A level gauge and a pressure gauge and mounting holes thereof are provided on the top of the flushing and draining trough 72 .

[0072] The wastewater recovery auxiliary unit includes a 2# interface box 81, a drainage funnel 82, a 2# interface box leakage water discharge valve 83 and its pipeline. The drainage funnel 82 is connected to the bottom of the 2# interface box 81 and the 2# interface box leakage water discharge valve 83, and the 2# interface box leakage water discharge valve 83 is connected to the plant special sewage discharge collection system through a pipeline.

[0073] The valves of this system use pneumatic valves, and the system is automatically controlled by PLC. The PLC control uses Siemens PCS7.0 version to program the pneumatic valves in the system to achieve automatic operation and control of the system.

[0074] The effective volume of the 1# waste resin buffer tank and the 2# waste resin buffer tank designed by the present invention is 1.2 to 1.5 cubic meters, which is the same as the effective volume of the transport tank truck storage tank. The main feature is to ensure that all the resin in the 1# waste resin buffer tank is transported to the transport tank truck storage tank in a single time, and also to ensure that all the resin in the transport tank truck storage tank is transported to the 2# waste resin buffer tank.

[0075] The vacuum unit designed by the present invention has a vacuum degree of -(30-60) KPa in the transport tanker storage tank and the 1# and 2# waste resin buffer tanks.

[0076] The present invention designs a drainage pump on the nuclear island side of the unit, which is connected to the bottom of the transport tank truck through pipelines, quick connectors and hoses. When draining water, the excess water in the tank is drained to the waste resin storage tank by pumping water from the transport tank truck.

[0077] The present invention is designed with a wastewater recovery unit, which can recover the wastewater in the flushing gutter into the storage tank of the transport tank truck.

[0078] The design of the present invention can realize negative pressure conveying of waste resin while still retaining the function of positive pressure conveying.

[0079] The design of the present invention has the function of flushing and purging the 1# and 2# waste resin buffer tanks and their transmission pipelines with demineralized water and compressed air, which can prevent the radioactive resin from remaining in the pipelines and ensure the effective and safe transmission of the radioactive waste resin.

[0080] In the system designed by the present invention, if liquid leakage occurs at the quick interface during the transportation process, the waste liquid can be collected through the interface box and discharged to the special sewage discharge collection system of the factory building.

[0081] The present invention designs a negative pressure conveying device and method for radioactive waste resin. The diameters of the pipelines of the waste resin buffer processing unit A, the waste resin transmission unit A, the waste resin buffer processing unit B, and the waste resin transmission unit B should not be less than DN50.

[0082] like Figure 1 As shown, the working process of the negative pressure conveying device for radioactive waste resin provided by the present invention on the nuclear island side is as follows:

[0083] Set all valves in this system to the closed state (initial state);

[0084] Step 1: The radioactive waste resin in the waste resin storage tank is transported to the 1# waste resin buffer tank 3

[0085] 1. After the radioactive waste resin in the waste resin storage tank decays for a certain period of time, open the outlet valve 1 of the resin delivery pump and the inlet valve 2 of the 1# waste resin buffer tank to deliver the waste resin to the waste resin buffer tank 3;

[0086] 2. Interlock the signal between the liquid level switch of the 1# waste resin buffer tank and the waste resin delivery pump to prevent the 1# waste resin buffer tank 3 from overflowing. After the delivery is completed, stop the resin delivery pump and automatically close the outlet valve 1 of the resin delivery pump and the inlet valve 2 of the 1# waste resin buffer tank;

[0087] Step 2: Create a vacuum in the transport tank

[0088] ① The quick interface valve B18, the quick interface valve A8 and the quick interface valve C35 in the transport tank truck 46 are respectively connected to the interface box quick interface valve B19, the interface box quick interface valve A7 and the interface box quick interface valve C36 in the 1# interface box 40 through the telescopic hose A9, the telescopic hose B17 and the telescopic hose C34;

[0089] ②Open the transport tank truck quick interface valve B18, transport tank truck quick interface valve A8, transport tank truck quick interface valve C35, interface box quick interface valve B19, interface box quick interface valve A7, interface box quick interface valve C36;

[0090] Open valve C10 in the transport tanker, resin inlet valve 11 in the transport tanker storage tank, exhaust outlet valve 14 in the transport tanker, valve A16, isolation valve B29, demineralized water flushing inlet valve 30, drain outlet valve 31 in the transport tanker storage tank, and valve B 33;

[0091] Open the vacuum unit 1# vacuum pump inlet valve 20 and 1# vacuum pump outlet valve 22, and open the exhaust valve A24;

[0092] ③ Start the 1# vacuum pump 21 to evacuate the transport tank of the transport tanker. The air in the tanker is discharged into the exhaust purification system of the plant equipment after passing through the 1# resin filter A13, the transport tanker exhaust outlet valve 14, the 1# gas-water separator 15, the valve A16, the transport tanker quick interface valve B18, the interface box quick interface valve B19, and the 1# air filter 23. After the pressure gauge value in the transport tanker storage tank 12 of the transport tanker 46 reaches the set pressure, the 1# vacuum pump 21 automatically stops, and the 1# vacuum pump inlet valve 20 and the 1# vacuum pump outlet valve 22 are closed;

[0093] ⑦ The vacuum pressure in the tank 12 of the transport tank truck 46 remains stable. No change in pressure after 10 to 20 seconds indicates that the quick connector and its pipeline are well sealed.

[0094] Step 3: The resin is transported from the 1# waste resin buffer tank 3 to the transport tanker storage tank 12

[0095] 1. Close valve A16, isolation valve B29, demineralized water flushing inlet valve 30, transport tanker tank drain outlet valve 31, and valve B33;

[0096] 2. Open the isolation valve A5 and the outlet valve 4 of the 1# waste resin buffer tank in sequence. At this time, the mixture of resin and water in the 1# waste resin buffer tank is transported to the storage tank 12 of the transport tank truck through the pipeline under the action of negative pressure. During this period, the resin transportation status and the state of completion of transportation can be observed through the 1# sight glass 6. The resin transportation status is judged by the resin liquid level in the buffer tank and the liquid level in the storage tank of the transport tank truck, and the resin transportation is completed;

[0097] 3. Open the vacuum unit bypass valve 25 to allow the gas in the tank truck to be filtered and discharged normally;

[0098] 4. Close isolation valve A55 and 1# waste resin buffer tank outlet valve 4 in sequence;

[0099] Step 4: Flushing and purging the resin delivery line

[0100] 1. After the resin is transported, open the deionized water isolation valve 43 to flush the resin transport pipeline, and close the deionized water isolation valve 43 after flushing for 5 to 10 seconds;

[0101] 2. After the desalted water flushing is completed, the compressed air inlet valve 44 is opened, and the compressed air passes through the check valve 45 to purge the resin delivery pipeline. After 5 to 10 seconds of purge, the compressed air inlet valve 44 is closed;

[0102] Step 5: Wastewater Discharge

[0103] 1. If it is determined during transportation that there is too much water in the tank through the resin level monitoring and water level monitoring in the transport tank truck storage tank 12, the drain outlet valve 31, valve B33, drain pump inlet valve 37, and drain pump outlet valve 39 of the transport tank truck storage tank can be opened, and the drain pump 38 can be started to drain the water in the transport tank truck storage tank to the waste resin storage tank through the drain pipe 32 in the transport tank truck storage tank (the lower part of the drain pipe is located below the filter screen 47 in the transport tank truck storage tank).

[0104] 2. After completing the resin delivery, close all valves, disconnect the connection between the transport tank truck quick interface valve B18, transport tank truck quick interface valve A8, transport tank truck quick interface valve C35 and the 1# interface box quick interface valve B19, quick interface valve A7, quick interface valve C36 and their instrumentation and electrical interfaces to complete the delivery of resin to the transport tank truck.

[0105] Step 6: Handling abnormal situations

[0106] 1. In special cases, if leakage occurs at the quick interface during the resin delivery process and drainage process, the leaked liquid will be collected through the 1# interface box 40 and discharged to the plant special sewage collection system through the drainage funnel 41 and the 1# interface box leakage water discharge valve 42.

[0107] like Figure 2 As shown, the working process of the negative pressure conveying device for radioactive waste resin provided by the present invention at the waste treatment center side is as follows:

[0108] Set all valves in this system to the closed state (initial state);

[0109] Step 1: Create vacuum in the 2# waste resin buffer tank

[0110] ① The quick interface valve B18, quick interface valve A8 and quick interface valve C35 of the transport tank truck are respectively connected to the quick interface valve E61, quick interface valve D80 and quick interface valve F79 in the 2# interface box 81 of the waste treatment center through the telescopic hose B17, telescopic hose A9 and telescopic hose C34;

[0111] ②Open the quick-connect valves B18, A8, C35, E61, D80, and F79;

[0112] ③Open the inlet valve 49, valve D53 and valve E60 of the 2# waste resin buffer tank;

[0113] ④ Open the 2# vacuum pump inlet valve 54 and the 2# vacuum pump outlet valve 56 of the 2# vacuum unit, and open the exhaust valve B58;

[0114] ⑤ Start the 2# vacuum pump 55 to evacuate the 2# waste resin buffer tank. The air in the 2# waste resin buffer tank is discharged into the plant equipment exhaust purification system after passing through the resin filter C51, the gas-water separator 52, the valve D53, the 2# vacuum pump inlet valve 54, the 2# vacuum pump outlet valve 56, the 2# air filter D57 and the exhaust valve B58. When the pressure gauge value in the 2# waste resin buffer tank reaches the set pressure, the 2# vacuum pump 55 automatically stops, and the 2# vacuum pump inlet valve 54 and the 2# vacuum pump outlet valve 56 are closed;

[0115] ⑥The vacuum pressure in the 2# waste resin buffer tank 50 remains stable. If the pressure does not change after 10 to 20 seconds, it means that the quick connector and its pipeline are well sealed;

[0116] Step 2: Transport the radioactive waste resin in tank 12 to the 2# waste resin buffer tank.

[0117] ①Open the resin outlet valve 27 and valve C10 of the transport tanker;

[0118] ②At this time, under the action of negative pressure, the mixture of resin and water in the tank 12 of the transport tanker is transported to the 2# waste resin buffer tank 50 through the pipeline. During this period, the resin transportation status and the status of the completion of transportation can be observed through the 2# sight glass 48, and the resin transportation status can be judged by the resin liquid level in the buffer tank and the liquid level in the tank of the transport tanker;

[0119] ③ Close the resin outlet valve 27 and valve C10 of the tanker tank to complete the resin transportation.

[0120] Step 3: The resin is transported from the 2# waste resin buffer tank 50 to the waste resin receiving tank 66

[0121] ① Close the resin outlet valve 27 of the transport tanker, valve C10, the inlet valve 49 of the 2# waste resin buffer tank, the inlet valve 54 of the 2# vacuum pump, and the outlet valve 56 of the 2# vacuum pump;

[0122] ② Open the 2# vacuum pump bypass valve 59, the waste resin delivery pump inlet valve 63, the waste resin delivery pump outlet valve 65, and the 2# waste resin buffer tank outlet valve 62 in sequence;

[0123] ③ Start the resin delivery pump 64 to deliver the waste resin from the 2# waste resin buffer tank 50 to the waste resin receiving tank 66;

[0124] ④ The resin delivery status is determined by the liquid level gauge in the 2# waste resin buffer tank 50, and the resin delivery pump 64 is stopped after the resin delivery is completed;

[0125] ⑤ Close the outlet valve 62 of the 2# waste resin buffer tank, the inlet valve 63 of the waste resin delivery pump, and the outlet valve 65 of the waste resin delivery pump;

[0126] Step 4: The resin is transported from the waste resin receiving tank 66 to the resin metering tank for processing

[0127] ① Open the waste resin receiving tank outlet valve 67, waste resin metering pump inlet valve 68, and waste resin metering pump outlet valve 70 in sequence;

[0128] ② Start the waste resin metering pump 69 to transport the waste resin from the waste resin receiving tank 66 to the resin metering tank for subsequent treatment;

[0129] ③ The resin delivery status is judged by the liquid level gauge in the resin metering tank, and the waste resin metering pump 69 is stopped after the resin delivery is completed;

[0130] ④ Close the waste resin receiving tank outlet valve 67, the waste resin metering pump inlet valve 68, and the waste resin metering pump outlet valve 70;

[0131] Step 5: Drain the waste resin receiving tank 66

[0132] ① Open the flushing tank inlet valve 71;

[0133] ② The water in the waste resin receiving tank 66 automatically flows to the flushing tank 72 by gravity;

[0134] ③ The drainage status is judged by the liquid level gauge in the flushing and draining groove 72, and the flushing and draining groove inlet valve 71 is automatically closed after the drainage is completed or the liquid level in the flushing and draining groove 72 reaches the high liquid level;

[0135] ④ When the water in the flushing drain trough 72 does not need to be recycled, the water in the flushing drain trough 72 is discharged to the special sewage discharge collection system of the factory building by opening the flushing drain trough outlet valve 73, the flushing drain pump inlet valve 74, and the flushing drain pump outlet valve 76, starting the flushing drain pump 75.

[0136] ⑤ After the discharge is completed, the flushing and drainage pump 75 is stopped, and the flushing and drainage trough outlet valve 73, the flushing and drainage pump inlet valve 74, and the flushing and drainage pump outlet valve 76 are closed.

[0137] Step 6: When the water in the flushing tank 72 needs to be recycled, the waste water in the waste resin receiving tank 66 is recycled.

[0138] ① Open valve E60, valve A16, transport tanker exhaust outlet valve 14, 2# vacuum pump inlet valve 54, 2# vacuum pump outlet valve 56, exhaust valve B58, and transport tanker quick interface valve B18 and quick interface valve E61;

[0139] ② Close valve D53 and 2# vacuum pump bypass valve 59;

[0140] ③ Start the 2# vacuum pump 55 to evacuate the transport tank of the transport tanker. The air in the tanker is discharged into the exhaust purification system of the plant equipment through the resin filter A13, the exhaust outlet valve 14 of the transport tanker, the gas-water separator 15, the valve A16, the quick interface valve B18, the quick interface valve E61, the valve E60, the 2# vacuum pump inlet valve 54, the 2# vacuum pump outlet valve 56, the 2# air filter D57, and the exhaust valve B58. When the pressure gauge value in the tank 12 of the transport tanker reaches the set pressure, the 2# vacuum pump 55 automatically stops;

[0141] ④ Close the 2# vacuum pump inlet valve 54 and the 2# vacuum pump outlet valve 56;

[0142] ⑤ Close valve E60, valve A16, transport tanker exhaust outlet valve 14, 2# vacuum pump inlet valve 54, 2# vacuum pump outlet valve 56, exhaust valve B58, and quick interface valve B18 and quick interface valve E61;

[0143] ⑥Open the valves to flush the desalted water inlet valve 30, valve B33, as well as the transport tank truck quick interface valve C35 and 2# interface box quick interface valve F79;

[0144] ⑦ Open valve F78, flushing and drainage return valve 77, and flushing and drainage trough outlet valve 73. At this time, under the action of negative pressure, the water in the flushing and drainage trough 72 is transported to the transport tank 12 through the pipeline. During this period, the water transportation status can be judged by the liquid level in the transport tank 12 and the liquid level in the flushing and drainage trough 72;

[0145] ⑧ Close valve F78, flushing and drainage return valve 77, flushing and drainage tank outlet valve 73, desalted water flushing inlet valve 30, valve B 33, as well as transport tank truck quick interface valve C35 and 2# interface box quick interface valve F79; to complete wastewater recovery;

[0146] Step 7: Flushing and purging the resin delivery line

[0147] ① After the resin is transported, open the desalted water isolation valve 43 to flush the resin transport pipeline, and close the desalted water isolation valve 43 after flushing for 5 to 10 seconds;

[0148] ② After the desalted water flushing is completed, the compressed air inlet valve 44 is opened, and the compressed air passes through the check valve 45 to purge the resin delivery pipeline. After 5 to 10 seconds of purge, the compressed air inlet valve 44 is closed;

[0149] Step 8: Wastewater discharge and pipeline flushing

[0150] ① If during transportation, it is determined that there is too much water in the tank through the resin liquid level monitoring and water level monitoring in the transport tank truck storage tank 12, the transport tank truck can be transported to the nuclear island side, and the transport tank truck storage tank drain outlet valve 31, valve B33, drain pump inlet valve 37, and drain pump outlet valve 39 are opened, and the drain pump 38 is started. The water in the transport tank truck storage tank is drained to the waste resin storage tank through the drain pipe 32 in the transport tank truck storage tank (the lower part of the drain pipe is located below the filter screen 47 in the transport tank truck storage tank). The method of step 1 can also be used to establish a vacuum in the 2# waste resin buffer tank, open the transport tank truck storage tank drain outlet valve 31, isolation valve B29, valve C10, 2# waste resin buffer tank inlet valve 49, transport tank truck quick interface valve A8, and interface box quick interface valve D80, and use the recycled water for pipeline flushing and 2# waste resin buffer tank flushing.

[0151] ② After completing the resin delivery, close all valves, disconnect the connection between the transport tank truck quick interface valve B18, transport tank truck quick interface valve A8, transport tank truck quick interface valve C35 and the interface box quick interface valve E61, interface box quick interface valve D80, interface box quick interface valve F79 and their instrumentation and electrical interfaces to complete the delivery of resin to the transport tank truck.

[0152] Step 9: Handling abnormal situations

[0153] In special circumstances, if liquid leakage occurs at the quick interface during the resin delivery process and the drainage process, the leaked liquid will be collected through the 2# interface box 81 and discharged to the plant special sewage collection system through the drainage funnel 82 and the 2# interface box leakage water discharge valve 83.

Claims

1. A negative pressure conveying device for radioactive waste resin, characterized in that: The device is distributed on the nuclear island side and the waste treatment center, wherein the nuclear island side includes a waste resin buffer treatment unit A, a vacuum unit A, a resin transmission unit A, a wastewater discharge unit and a wastewater discharge auxiliary unit; the waste treatment center includes a waste resin buffer treatment unit B, a vacuum unit B, a resin transmission unit B, a wastewater recovery unit and a wastewater recovery auxiliary unit; the waste resin buffer treatment unit A includes a 1# waste resin buffer tank (3); the waste resin buffer treatment unit B includes a 2# waste resin buffer tank (50); the resin transmission unit A and the resin transmission unit B both include a transport tank truck storage tank (12); the vacuum degree in the transport tank truck storage tank (12), the 1# waste resin buffer tank (3) and the 2# waste resin buffer tank (50) is -(30-600) KPa; The waste resin buffer processing unit A further comprises a 1# waste resin buffer tank inlet valve (2), a 1# waste resin buffer tank outlet valve (4), a waste resin conveying isolation valve A (26), an isolation valve A (5), a 1# sight glass (6) and pipelines thereof; one end of the 1# waste resin buffer tank inlet valve (2) is connected to the resin conveying pump outlet valve (1) and the waste resin conveying isolation valve A (26) through a pipeline, the other end of the 1# waste resin buffer tank inlet valve (2) is connected to the top of the 1# waste resin buffer tank (3) in the form of a flange through a pipeline, the bottom of the 1# waste resin buffer tank (3) is connected to the 1# waste resin buffer tank outlet valve (4) through a pipeline, the other end of the 1# waste resin buffer tank outlet valve (4) is connected to the waste resin conveying isolation valve A (26) and the isolation valve A (5) through a pipeline, and the isolation valve A (5) is connected to the 1# sight glass (6) through a pipeline; The vacuum unit A comprises a filter A (13), an exhaust outlet valve (14) of a transport tank truck, a 1# gas-water separator (15), a valve A (16), a telescopic hose B (17), a quick interface valve B (18) of a transport tank truck, a quick interface valve B (19) of an interface box, a 1# vacuum pump inlet valve (20), a 1# vacuum pump (21), a 1# vacuum pump outlet valve (22), a filter B (23), an exhaust valve A (24), a 1# vacuum pump bypass valve (25) and pipelines thereof; the filter A (13) is installed on the top of a storage tank (12) of a transport tank truck and is connected to the exhaust outlet valve (14) of the transport tank truck through a pipeline; the exhaust outlet valve (14) of the transport tank truck is connected to the 1# gas-water separator (15) through a pipeline; the gas side of the 1# gas-water separator (15) is connected to the valve A (16) through a pipeline; the 1# gas-water separator (15) is connected to the valve A (16) through a pipeline; The water side of the device (15) is connected to the resin outlet valve (27) of the transport tank truck through a pipeline, the valve A (16) is connected to the telescopic hose B (17) through a pipeline, the telescopic hose B (17) is connected to the quick interface valve B (18) of the transport tank truck, the quick interface valve B (19) of the interface box is connected to the 1# vacuum pump inlet valve (20) through a pipeline, the 1# vacuum pump inlet valve (20) is connected to the 1# vacuum pump (21) and the 1# vacuum pump bypass valve (25) through a pipeline, the 1# vacuum pump (21) is connected to the 1# vacuum pump outlet valve (22) through a pipeline, the 1# vacuum pump outlet valve (22) is connected to the 1# vacuum pump bypass valve (25) and the filter B (23) through a pipeline, the filter B (23) is connected to the exhaust valve A (24) through a pipeline, and the exhaust valve A (24) is connected to the plant equipment exhaust purification system through a pipeline; The vacuum unit B comprises a filter C (51), a 2# gas-water separator (52), a valve D (53), a 2# vacuum pump inlet valve (54), a 2# vacuum pump (55), a 2# vacuum pump outlet valve (56), a filter D (57), an exhaust valve B (58), a 2# vacuum pump bypass valve (59), a valve E (60), an interface box quick interface valve E (61) and pipelines thereof; the filter C (51) is installed on the top of the 2# waste resin buffer tank (50) and is connected to the 2# gas-water separator (52) through a pipeline, the 2# gas-water separator (52) is connected to the valve D (53) through a pipeline, and the valve D (53) ) are respectively connected to the 2# vacuum pump inlet valve (54), the 2# vacuum pump bypass valve (59) and the valve E (60); the 2# vacuum pump inlet valve (54) is connected to the 2# vacuum pump (55) through a pipeline; the 2# vacuum pump (55) is connected to the 2# vacuum pump outlet valve (56) through a pipeline; the 2# vacuum pump outlet valve (56) is respectively connected to the 2# vacuum pump bypass valve (59) and the filter D (57); the filter D (57) is connected to the exhaust valve B (58) through a pipeline; the exhaust valve B (58) is connected to the plant equipment exhaust purification system; the valve E (60) is connected to the interface box quick interface valve E (61) through a pipeline; The waste resin buffer processing unit B also includes an interface box quick interface valve D (80), a 2# sight glass (48), a 2# waste resin buffer tank inlet valve (49), a 2# waste resin buffer tank outlet valve (62), a resin delivery pump inlet valve (63), a resin delivery pump (64), a resin delivery pump outlet (65), a waste resin receiving tank (66), a waste resin receiving tank outlet valve (67), a waste resin metering pump inlet valve (68), a waste resin delivery pump (69), a waste resin metering pump outlet valve (70) and pipelines thereof; the interface box quick interface valve D (80) is installed in the 2# interface box and is connected to the 2# sight glass (48) through a pipeline; the 2# sight glass (48) is connected to the 2# waste resin buffer tank inlet valve (49) through a pipeline; the 2# waste resin buffer tank inlet valve (49) is connected to the 2# waste resin buffer tank (50) through a pipeline and a flange; the bottom of the 2# waste resin buffer tank (50) is connected to the 2# waste resin buffer tank (50) through a pipeline. The first waste resin buffer tank is connected to the outlet valve (62) of the first waste resin buffer tank, the outlet valve (62) of the second waste resin buffer tank is connected to the inlet valve (63) of the resin delivery pump through a pipeline, the inlet valve (63) of the resin delivery pump is connected to the resin delivery pump (64) through a pipeline, the resin delivery pump (64) is connected to the outlet (65) of the resin delivery pump through a pipeline, the outlet (65) of the resin delivery pump is connected to the waste resin receiving tank (66) through a pipeline and a flange, a filter is arranged in the waste resin receiving tank (66) to separate resin and water, a pipeline at the bottom of the waste resin receiving tank (66) leads to the resin side, and is connected to the outlet valve (67) of the waste resin receiving tank through a pipeline, the outlet valve (67) of the waste resin receiving tank is connected to the inlet valve (68) of the waste resin metering pump through a pipeline, the inlet valve (68) of the waste resin metering pump is connected to the waste resin metering pump (69) through a pipeline, and the waste resin delivery pump (69) is connected to the outlet valve (70) of the waste resin metering pump through a pipeline.

2. A method for negative pressure transportation of radioactive waste resin, characterized in that: It includes two parts: the nuclear island side and the waste treatment center side. The negative pressure transportation method of radioactive waste resin on the nuclear island side includes: Step 1: transporting the radioactive waste resin in the waste resin storage tank to the 1# waste resin buffer tank (3); Step 2: establishing a vacuum in the transport tank (12) of the transport tank truck; Step 3: transporting the waste resin from the 1# waste resin buffer tank (3) to the transport tank (12) of the transport tank truck; Step 4: flushing and purging the waste resin transport pipeline; Step 5: discharging wastewater; Step 6: handling abnormal situations; The negative pressure conveying method of radioactive waste resin at the waste treatment center side comprises: step 1: establishing vacuum in the 2# waste resin buffer tank; step 2: conveying the radioactive waste resin in the storage tank (12) of the transport tank truck to the 2# waste resin buffer tank; step 3: conveying the waste resin from the 2# waste resin buffer tank (50) to the waste resin receiving tank (66); step 4: conveying the waste resin from the waste resin receiving tank (66) to the resin metering tank for treatment; step 5: draining the waste resin receiving tank (66); step 6: when the water in the flushing tank (72) needs to be recycled, the waste water in the waste resin receiving tank (66) is recycled; step 7: flushing and purging the waste resin conveying pipeline; step 8: discharging waste water and flushing the pipeline; step 9: handling abnormal situations; Step 1 of the negative pressure conveying method for radioactive waste resin on the nuclear island side: the radioactive waste resin in the waste resin storage tank is conveyed to the 1# waste resin buffer tank (3): ① After the radioactive waste resin in the waste resin storage tank decays for a certain period of time, the outlet valve (1) of the resin delivery pump and the inlet valve (2) of the 1# waste resin buffer tank are opened to deliver the waste resin to the waste resin buffer tank (3); ② The liquid level switch of the 1# waste resin buffer tank (3) is interlocked with the stop signal of the waste resin delivery pump to prevent overflow of the 1# waste resin buffer tank (3). After the delivery is completed, the resin delivery pump is stopped and the outlet valve (1) of the resin delivery pump and the inlet valve (2) of the 1# waste resin buffer tank are automatically closed. Step 2 of the negative pressure transport method for radioactive waste resin on the nuclear island side: establishing a vacuum in the transport tank (12) of the transport tank truck, and the specific implementation steps include: ① The transport tank truck quick interface valve B (18), the transport tank truck quick interface valve A (8), and the transport tank truck quick interface valve C (35) in the transport tank truck (46) are respectively connected to the interface box quick interface valve B (19), the interface box quick interface valve A (7), and the interface box quick interface valve C (36) in the No. 1 interface box (40) through the telescopic hose B (17), the telescopic hose A (9), and the telescopic hose C (34); ② Open the transport tank truck quick-connection valve B (18), transport tank truck quick-connection valve A (8), transport tank truck quick-connection valve C (35), 1# interface box quick-connection valve B (19), 1# interface box quick-connection valve A (7), and 1# interface box quick-connection valve C (36); ③ Open valve C (10) in the transport tank truck, resin inlet valve (11) of the transport tank truck storage tank (12), exhaust outlet valve (14) of the transport tank truck, valve A (16), isolation valve B (29), deionized water flushing inlet valve (30), drain outlet valve (31) of the transport tank truck storage tank, and valve B (33); ④ Open the 1# vacuum pump inlet valve (20) and 1# vacuum pump outlet valve (22) of vacuum unit A, and open exhaust valve A (24); ⑤ Start the 1# vacuum pump (21) to evacuate the transport tank (12) of the transport tank truck. The air in the tank truck is discharged into the plant equipment exhaust purification system after passing through the 1# resin filter A (13), the transport tank truck exhaust outlet valve (14), the 1# gas-water separator (15), the valve A (16), the transport tank truck quick interface valve B (18), the 1# interface box quick interface valve B (19), and the 1# air filter B (23). When the pressure gauge value in the transport tank (12) of the transport tank truck (46) reaches the set pressure, the 1# vacuum pump (21) automatically stops, and the 1# vacuum pump inlet valve (20) and the 1# vacuum pump outlet valve (22) are closed; ⑥ The vacuum pressure in the tank (12) of the transport tank truck (46) remains stable. If the pressure does not change after 10 to 20 seconds, it means that the quick connector and its pipeline are well sealed; Step 1 of the negative pressure conveying method for radioactive waste resin at the waste treatment center: Establish vacuum in the 2# waste resin buffer tank: The transport tank truck quick interface valve B (18), the transport tank truck quick interface valve A (8), and the transport tank truck quick interface valve C (35) in the transport tank truck (46) are connected to the interface box quick interface valves E (61), D (80), and F (79) in the interface box #2 (81) of the waste treatment center through the telescopic hose A (9), the telescopic hose B (17), and the telescopic hose C (34), respectively; 2 Open the transport tank truck quick interface valve A (8), transport tank truck quick interface valve B (18), transport tank truck quick interface valve C (35), 2# interface box quick interface valve E (61), 2# interface box quick interface valve F (79), 2# interface box quick interface valve D (80); 3. Open the inlet valve (49), valve D (53), and valve E (60) of the 2# waste resin buffer tank; 4. Open the 2# vacuum pump inlet valve (54) and the 2# vacuum pump outlet valve (56) of the 2# vacuum unit, and open the exhaust valve B (58); 5. Start the 2# vacuum pump (55) to evacuate the 2# waste resin buffer tank. The air in the 2# waste resin buffer tank is discharged into the plant equipment exhaust purification system after passing through the resin filter C (51), the air-water separator (52), the valve D (53), the 2# vacuum pump inlet valve (54), the 2# vacuum pump outlet valve (56), the 2# air filter D (57) and the exhaust valve B (58). When the pressure gauge value in the 2# waste resin buffer tank reaches the set pressure, the 2# vacuum pump (55) automatically stops, and the 2# vacuum pump inlet valve (54) and the 2# vacuum pump outlet valve (56) are closed. ⑥ The vacuum pressure in the 2# waste resin buffer tank (50) remains stable. No change in pressure after 10 to 20 seconds indicates that the quick connector and its pipeline are well sealed. Step 2 of the negative pressure transport method for radioactive waste resin at the waste treatment center: transport the radioactive waste resin in the tank (12) of the transport tanker to the 2# waste resin buffer tank:

1. Open the resin outlet valve (27) and valve C (10) of the transport tanker; 2 At this time, under the action of negative pressure, the mixture of resin and water in the storage tank (12) of the transport tanker is transported to the 2# waste resin buffer tank (50) through the pipeline. During this period, the resin transport situation and the state of completion of transport can be observed through the 2# sight glass (48), and the resin transport situation can be judged by the resin liquid level in the buffer tank and the liquid level in the storage tank of the transport tanker; 3. Close the resin outlet valve (27) and valve C (10) of the transport tanker to complete the resin transportation.

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