Continuous spraying device and method, test system and nuclear facility decontamination system

Abstract

The invention discloses a continuous spraying device which comprises a first storage tank and an adjusting gas circuit, spraying liquid is stored in the first storage tank, a first pipeline is connected to the first storage tank, a spraying head facing a workpiece to be treated is arranged at the tail end of the first pipeline, and a flow control valve is arranged on the first pipeline. The adjusting gas circuit comprises a second pipeline and a third pipeline, the second pipeline is connected with the gas source and the first storage tank, a first pressure reducing valve is arranged on the second pipeline and used for enabling gas with first set pressure to enter the first storage tank, the third pipeline is connected with the first storage tank and the blow-down pipe, and a second pressure reducing valve is arranged on the third pipeline and used for enabling gas with second set pressure to enter the blow-down pipe. And the first pipeline is used for enabling the liquid in the first storage tank to reach the spraying head through the first pipeline at a second set pressure under the action of the gas entering the first storage tank. The continuous spraying device is simple in structure, stable and reliable in spraying effect, flexible in adjustability and capable of achieving a good decontamination effect. The invention further provides a spraying method, a testing system and a nuclear facility decontamination system.

Description

Technical Field

[0001] The invention specifically relates to a continuous spraying device, method, test system and nuclear facility decontamination system. Background Art

[0002] During the long-term operation of nuclear facilities, a large amount of radioactively contaminated metal equipment and materials will accumulate. Under the long-term operation environment, the metal substrate is contaminated to varying degrees, and a dense oxide film is formed on the surface. Some of the radioactive nuclides are adsorbed on the surface, and some enter the corroded surface. Nuclear facility decontamination can effectively remove radioactive contamination on the surface of equipment and materials, thereby minimizing the possibility of contamination spread, reducing the harm of radioactive nuclides to people and the environment, and reducing the difficulty and amount of radioactive solid waste treatment.

[0003] Spray decontamination is a common method for decontaminating the surface of flat equipment or pipelines, and can minimize the generation of secondary waste liquid. However, since the current spraying devices are relatively simple, overly extensive spraying methods can hardly achieve the best effect of the spraying reagent, making it difficult to achieve good surface decontamination effects. Summary of the invention

[0004] The inventors of the present invention have found that the use of nuclear facility decontamination spray reagents is largely affected by spray operation factors such as spray pressure, spray flow, and temperature. Therefore, the design of the decontamination device is the key to achieving decontamination of retired equipment. Although there are currently ways to achieve changes in spray operation factors by using pump delivery to adjust pressure and flow valves to adjust flow, it is still difficult to achieve the best effect of the reagents.

[0005] After in-depth research, the inventors found that the main reason lies in the stability of the spray pressure and flow, that is, the state of the reagent when it acts on the treatment surface. When the pressure and flow of the spraying reagent can reach a stable state, the reagent and the flushing surface can be in continuous and stable contact and the reagent can be continuously renewed. Compared with ordinary flushing, the decontamination effect is better and the reagent effect can be well exerted. However, the current pumping method often has unavoidable fluctuations, which makes it difficult to achieve this effect.

[0006] The technical problem to be solved by the present invention is to provide a continuous spraying device for the above-mentioned deficiencies in the prior art, which has a stable and reliable spraying effect, is flexible and adjustable, and can achieve a good decontamination effect. The present invention also provides a spraying method, a test system, and a nuclear facility decontamination system.

[0007] The present invention provides a continuous spraying device, comprising a first storage tank and a regulating gas circuit, wherein the first storage tank stores liquid for spraying, the first storage tank is connected to a first pipeline, a spray head facing a workpiece to be processed is arranged at the end of the first pipeline, a flow control valve is arranged on the first pipeline, the regulating gas circuit comprises a second pipeline and a third pipeline, the second pipeline is connected to an air source and the first storage tank, a first pressure reducing valve is arranged on the second pipeline, and is used to allow gas of a first set pressure to enter the first storage tank, the third pipeline is connected to the first storage tank and a vent pipe, and a second pressure reducing valve is arranged on the third pipeline, and is used to allow the liquid in the first storage tank to reach the spray head through the first pipeline at a second set pressure under the action of the gas entering the first storage tank.

[0008] Furthermore, the device also includes a control system, a second pressure gauge is provided at the first pressure reducing valve of the second pipeline, and a fourth pressure gauge is provided at the flow control valve of the first pipeline. The control system is electrically connected to the second pressure gauge, the first pressure reducing valve, the fourth pressure gauge and the second pressure reducing valve, respectively, and is used to control the opening of the first pressure reducing valve according to the indication of the second pressure gauge so that the indication of the second pressure gauge is maintained at the first set pressure, and to control the opening of the second pressure reducing valve according to the indication of the fourth pressure gauge so that the indication of the fourth pressure gauge is maintained at the second set pressure, and the second set pressure is not higher than the first set pressure.

[0009] Furthermore, the ends of the second pipeline and the third pipeline disposed in the first storage tank are both located at the top of the first storage tank, and the end of the first pipeline disposed in the first storage tank is located below the liquid level of the spraying liquid.

[0010] Furthermore, the device also includes a second storage tank, which is used to store the spraying liquid. The second storage tank is connected to the first storage tank through a fourth pipeline. The fourth pipeline is provided with a feed pump for supplying the spraying liquid to the first storage tank.

[0011] Furthermore, the device also includes a spray hood, the spray head and the workpiece to be processed are both arranged in the spray hood, the spray hood is connected to the second storage tank through a fifth pipeline, and a reflux pump is provided on the fifth pipeline for transporting the spray liquid after spraying to the second storage tank.

[0012] Furthermore, the end of the fifth pipeline arranged in the spray hood, the end of the fourth pipeline arranged in the second storage tank, and the end of the first pipeline arranged in the first storage tank are all provided with filter heads for filtering the spraying liquid.

[0013] Furthermore, the first storage tank is provided with a safety valve for opening when the pressure in the first storage tank exceeds a third set pressure.

[0014] Furthermore, a three-way valve is provided on the third pipeline, and three interfaces of the three-way valve are respectively connected to the first storage tank, the second pressure reducing valve and the atmosphere, and the first storage tank is connected to the second pressure reducing valve under normal working conditions, and the first storage tank is directly connected to the atmosphere under accident conditions, for emergency deflation and pressure reduction.

[0015] Furthermore, an oil bath heater is provided outside the first storage tank for heating the first storage tank so as to keep the spraying liquid in the first storage tank at a set temperature.

[0016] The present invention also provides a spraying method, using the above-mentioned spraying device, the method comprises the following steps:

[0017] Close the flow control valve and make the internal pressure of the first storage tank consistent with the external environmental pressure;

[0018] Feeding into the first storage tank until the spraying liquid reaches a set amount;

[0019] Open the third pipeline to inlet air;

[0020] Open the second pipeline to inlet air, adjust the first pressure reducing valve to the first set pressure, and adjust the second pressure reducing valve to the second set pressure;

[0021] The flow control valve is opened to complete the spraying with the spraying liquid at the second set pressure and set flow rate.

[0022] The present invention also provides a spray test system, comprising a sample sheet and the above-mentioned continuous spray device, wherein the sample sheet is arranged at the spray head position of the continuous spray device as a workpiece to be processed.

[0023] The present invention also provides a nuclear facility decontamination system, comprising metal equipment and the above-mentioned continuous spraying device, wherein the metal equipment serves as a workpiece to be processed, and the spray head of the continuous spraying device is arranged at the surface of the metal equipment that is contaminated by radioactivity.

[0024] The continuous spraying device of the present invention does not have a pump in front of the spray head for transportation, but instead has a regulating gas circuit at the first storage tank for storing the spray liquid, wherein the second pipeline feeds gas into the first storage tank to increase the pressure inside the first storage tank, and the second pressure reducing valve is provided on the third pipeline to be able to adjust the pressure of the spray liquid output from the first storage tank by back pressure, that is, the spray liquid in the first storage tank is transported to the spray head by feeding gas and back pressure.

[0025] Compared with the pumping method in front of the sprinkler head, this structural setting first avoids the fluctuation of the delivery pressure caused by the rotation of the pump, ensuring that the output pressure can always be stable. Secondly, compared with the need for the pump to gradually reach the set number of revolutions when adjusting the output pressure, the device uses the second pressure reducing valve for adjustment, which is faster and more direct, and also more sensitive and accurate. In addition, since there is no need to set a pump in front of the sprinkler head, it also avoids the change of the originally determined flow rate caused by the pump's own adjustment, and avoids the flow rate fluctuation caused by the pump's rotation fluctuation. The pressure regulation and flow rate regulation of the device are respectively set on two pipelines, and the first storage tank itself acts as a buffer in the middle, thereby further reducing the mutual influence during adjustment.

[0026] Because of the above characteristics, the device makes the spraying operation more direct, sensitive and precise during the spraying process, and the flow rate and pressure can reach a stable state, so that the reagent and the flushing surface can be in continuous and stable contact and the reagent can be continuously updated at the same time, so a good surface decontamination effect can be achieved. Moreover, since it can provide stable and reliable output pressure and flow, it is particularly suitable for spraying tests under various pressure and flow conditions, thereby providing a basis for the improvement of spraying operation factors. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a connection diagram of the continuous spraying device in Example 1 of the present invention;

[0028] Figure 2 It is a schematic diagram of the layout of the continuous spraying device in Example 1 of the present invention.

[0029] In the figure: 1. first storage tank; 11. first pipeline; 111. flow control valve; 112. flow meter; 113. fourth pressure gauge; 12. spray head; 13. safety valve; 2. regulating gas circuit; 21. second pipeline; 211. first pressure reducing valve; 212. gas filter; 213. first two-way ball valve; 214. gas one-way valve; 215. first pressure gauge; 216. second pressure gauge; 217. second two-way ball valve; 22. third pipeline; 221. second pressure reducing valve; 222. three-way valve; 223. third pressure gauge; 3. workpiece to be processed; 4. vent pipe; 5. second storage tank; 51. fourth pipeline; 52. feed pump; 53. liquid one-way valve; 6. spray hood; 61. fifth pipeline; 62. reflux pump; 7. filter head; 8. oil bath heater. DETAILED DESCRIPTION

[0030] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "upper", "lower" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience and simplification of the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0032] In the description of the present invention, the terms “first”, “second” and “third” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connect", "set", "install", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0034] Example 1

[0035] like Figure 1 and Figure 2 As shown, the continuous spraying device of this embodiment includes a first storage tank 1 and a regulating gas circuit 2. The first storage tank 1 stores liquid for spraying. The first storage tank 1 is connected to a first pipeline 11. A spray head 12 facing the workpiece 3 to be processed is arranged at the end of the first pipeline 11. A flow control valve 111 is arranged on the first pipeline 11 for adjusting the spray flow rate of the liquid reagent for spraying. The regulating gas circuit 2 includes a second pipeline 21 and a third pipeline 22. The second pipeline 21 connects the gas source and the first storage tank 1. A first pressure reducing valve 211 is arranged on the second pipeline 21 for allowing gas of a first set pressure to enter the first storage tank 1. The third pipeline 22 connects the first storage tank 1 and the vent pipe 4. A second pressure reducing valve 221 is arranged on the third pipeline 22 for allowing the liquid in the first storage tank 1 to reach the spray head 12 at a second set pressure through the first pipeline 11 under the action of the gas entering the first storage tank 1.

[0036] The continuous spraying device of this embodiment does not have a pump arranged in front of the spray head 12 for conveying, but instead has a regulating gas circuit 2 arranged at the first storage tank 1 for storing the spraying liquid, wherein the second pipeline 21 feeds gas into the first storage tank 1 to increase the pressure inside the first storage tank 1, and the second pressure reducing valve 221 is arranged on the third pipeline 22 to be able to adjust the pressure of the spraying liquid output from the first storage tank 1 by back pressure, that is, the spraying liquid in the first storage tank 1 is conveyed to the spray head 12 by feeding gas and back pressure.

[0037] Compared with the pumping method in front of the sprinkler head 12, this structural setting first avoids the fluctuation of the delivery pressure caused by the rotation of the pump, ensuring that the output pressure can always be stable. Secondly, compared with the need for the pump to gradually reach the set number of revolutions when adjusting the output pressure, the device uses the second pressure reducing valve 221 for adjustment, which is faster and more direct, and also more sensitive and accurate. In addition, since there is no need to set a pump in front of the sprinkler head 12, there is only a flow control valve 111 on the first pipeline 11 for liquid output, which also avoids the change of the originally determined flow rate caused by the pump's own adjustment, and avoids the flow fluctuation caused by the pump rotation fluctuation. In addition, a back pressure gas circuit (i.e., the third pipeline 22) which is independent of the liquid output pipeline (i.e., the first pipeline 11) is used as the setting position of the second pressure reducing valve. Firstly, there is a first storage tank 1 between the first pipeline 11 and the third pipeline 22 as a middle buffer, thereby further reducing the pressure regulation fluctuation itself. Secondly, the pressure regulation and flow regulation of the device are respectively arranged on two pipelines, and the first storage tank 1 itself is used as a buffer in the middle, thereby further reducing the mutual influence of the two during regulation.

[0038] Because of the above characteristics, the spraying operation is more direct, sensitive and precise during the spraying process. The spraying reagent with stable pressure and flow can achieve the effect of continuous and stable contact between the reagent and the flushing surface and continuous renewal of the reagent, thereby achieving a good surface decontamination effect. It can be used for cleaning radioactive contaminants on metal equipment in nuclear facilities. And because it can provide stable and reliable output pressure and flow, it is particularly suitable for spraying tests under various pressure and flow conditions, thereby providing a basis for improving spraying operation factors.

[0039] In this embodiment, the continuous spraying device also includes a control system, a first pressure gauge 215 and a second pressure gauge 216 are respectively provided on both sides of the first pressure reducing valve 211 of the second pipeline 21, a third pressure gauge 223 (located between the second pressure reducing valve 221 and the first storage tank 1) is provided at the second pressure reducing valve 221 of the third pipeline 22, and a fourth pressure gauge 113 (located between the flow control valve 111 and the sprinkler head 12) is provided at the flow control valve 111 of the first pipeline 11, wherein the second pressure gauge 216 is arranged at the first pressure reducing valve 211 near the first pressure reducing valve 211. On one side of a storage tank 1, the control system is electrically connected to the second pressure gauge 216, the first pressure reducing valve 211, the fourth pressure gauge 113 and the second pressure reducing valve 221, respectively, and is used to control the opening of the first pressure reducing valve 211 according to the indication of the second pressure gauge 216 so that the indication of the second pressure gauge 216 is maintained at the first set pressure, and to control the opening of the second pressure reducing valve 221 according to the indication of the fourth pressure gauge 113 so that the indication of the fourth pressure gauge 113 is maintained at the second set pressure, and the second set pressure is not higher than the first set pressure.

[0040] In this embodiment, the gas source is a nitrogen tank, which is the pressure source of the entire device. Its pressure is a common standard, generally about 15MPa. Through the first pressure reducing valve 211, the pressure input into the device is adjusted as needed (that is, the adjustable range of the first set pressure is 0MPa to 10MPa). Through the second pressure reducing valve 221, the pressure in the first storage tank 1 is adjusted (that is, the second set pressure is less than or equal to the first set pressure), so that the reagent is sprayed out from the spray head 12 at the second set pressure. When the liquid volume in the first storage tank 1 changes greatly (liquid consumption / replenished liquid volume) and causes the spray pressure to change (which can be measured by the fourth pressure gauge 113), the second pressure reducing valve 221 can be adjusted to keep the current spray pressure stable at the second set pressure (that is, if the pressure is greater than the second set pressure, the pressure is reduced, and if the pressure is less than the second set pressure, the pressure is increased). If the pressure exceeding the upper limit of 10MPa is provided by the gas source, the device is prone to uncontrollable safety risks and failures. For safety reasons, 10MPa is set as the upper limit of the design operating pressure of the device.

[0041] In this embodiment, a flow meter 112 is further provided on the first pipeline 11. The flow meter 112 is arranged between the flow control valve 111 and the sprinkler head 12, and is used to monitor the flow of the first pipeline 11. The fourth pressure gauge 113 is located behind the flow meter 112, that is, on the first pipeline 11. The flow control valve 111, the flow meter 112 and the fourth pressure gauge 113 are arranged in sequence from the first storage tank 1 to the sprinkler head 12. The second pipeline 21 is also provided with a gas filter 212, a first two-way ball valve 213, a second two-way ball valve 217 and a gas check valve 214. The gas filter 212 is arranged behind the gas source, and the first two-way ball valve 213 and the second two-way ball valve 217 are arranged on both sides of the first pressure reducing valve 211, wherein the first two-way ball valve 213 is located on the side of the first pressure reducing valve 211 close to the gas source, and the gas check valve 214 is arranged in front of the first storage tank 1 to prevent the high-pressure fluid from flowing back. On the second pipeline 21, the gas filter 212, the first two-way ball valve 213, the first pressure gauge 215, the first pressure reducing valve 211, the second pressure gauge 216, the second two-way ball valve 217, and the gas check valve 214 are arranged in sequence from the gas source to the first storage tank 1. On the third pipeline 22, a three-way valve 222, a third pressure gauge 223, and a second pressure reducing valve 221 are arranged in sequence from the first storage tank 1 to the vent pipe 4.

[0042] In this embodiment, the ends of the second pipeline 21 and the third pipeline 22 disposed in the first storage tank 1 are both located at the top of the first storage tank 1 to ensure that the second pipeline 21 and the third pipeline 22 are in contact with the gas in the first storage tank 1, and the end of the first pipeline 11 disposed in the first storage tank 1 is located below the liquid level of the spraying liquid, thereby ensuring that the liquid can enter the first pipeline 11 under the action of the incoming gas.

[0043] In this embodiment, the continuous spraying device further includes a second storage tank 5, which is used to store the spraying liquid. The second storage tank 5 is connected to the first storage tank 1 through a fourth pipeline 51, and a feed pump 52 is provided on the fourth pipeline 51, which is used to supply the spraying liquid to the first storage tank 1. The second storage tank 5 can supply liquid to the first storage tank 1, so there is no need to set too much liquid inside the first storage tank 1, that is, to retain the operating space for adjusting the gas circuit 2. At the same time, the liquid level in the first storage tank 1 can be monitored by observing the liquid level in the second storage tank 5, and due to the buffering effect of the first storage tank 1 itself, the pumping of the feed pump 52 will not affect the spraying effect. The fourth pipeline 51 is also provided with a liquid one-way valve 53 behind the feed pump 52 to prevent the backflow of high-pressure fluid.

[0044] In this embodiment, the continuous spraying device also includes a spray hood 6, the spray head 12 and the workpiece 3 to be processed are both arranged in the spray hood 6, the spray hood 6 is connected to the second storage tank 5 through the fifth pipeline 61, and the fifth pipeline 61 is provided with a reflux pump 62, which is used to transport the spray liquid after spraying to the second storage tank 5, that is, to realize the circulation of the spray liquid, greatly reducing the amount of liquid required for spraying, and because of the existence of the second storage tank 5, the liquid in the spray hood 6 will not directly enter the first storage tank 1, not only an additional layer of filtration protection, but also the liquid stored in the second storage tank 5 provides sufficient buffer for the change of the liquid amount of the entire device circuit. The spray hood 6 can use a visual protective cover to observe the spray cleaning situation inside.

[0045] In this embodiment, the end of the fifth pipeline 61 arranged in the spray hood 6, the end of the fourth pipeline 51 arranged in the second storage tank 5, and the end of the first pipeline 11 arranged in the first storage tank 1 are all provided with filter heads 7 for filtering the spraying liquid.

[0046] In this embodiment, a safety valve 13 is provided on the first storage tank 1, which is used to open when the pressure in the first storage tank 1 exceeds the third set pressure to ensure the safety of the circuit.

[0047] In this embodiment, a three-way valve 222 is also provided on the third pipeline 22. The three interfaces of the three-way valve 222 are respectively connected to the first storage tank 1, the second pressure reducing valve 221 and the atmosphere, and the first storage tank 1 is connected to the second pressure reducing valve 221 under normal working conditions, that is, the third pipeline 22 is connected; under accident conditions, the first storage tank 1 is directly connected to the atmosphere for emergency deflation and pressure reduction. The setting of the three-way is mainly for safety considerations. When the device system is operating normally, the direction from the first storage tank 1 to the pressure reducing valve 221 is connected, and it is not connected to the outside atmosphere. If a situation requires emergency and rapid deflation and pressure reduction, the three-way valve 222 is adjusted to directly connect the first storage tank 1 and the outside atmosphere, and it is not connected to the 222 pressure reducing valve. (Quick and convenient processing is the demand for deflation and pressure reduction in emergency situations. Although the 221 pressure reducing valve can also deflate and reduce pressure, it does not meet the needs of handling emergency situations, so the three-way valve 222 is set).

[0048] In this embodiment, an oil bath heater 8 is further provided outside the first storage tank 1 for heating the first storage tank 1 so as to keep the spraying liquid in the first storage tank 1 at a set temperature.

[0049] The present embodiment relates to a continuous high-pressure variable temperature spray cleaning device to handle the decontamination of flat equipment or pipeline surfaces. When applied to the spray cleaning of radioactive pollutants, a detergent is specifically used as the spray liquid. At present, both engineering applications and experimental designs use pumps to transport spray reagents to achieve spraying, and the pump will produce large fluctuations during the transportation process, making it difficult to maintain a stable spray pressure, resulting in a decrease in the attention of personnel in this field to the spray pressure situation, thereby limiting the improvement and improvement of the spray device in this regard. The device of this embodiment optimizes the spray effect by making the spray pressure, spray flow, temperature and other factors related to the spray effect in the spray operation more stable and reliable, thereby providing a continuous high-pressure variable temperature spray device to achieve variable temperature and variable pressure continuous spraying, so as to achieve the effect of continuous and stable contact of the metal surface with the detergent and continuous renewal of the reagent at the same time.

[0050] The device can be divided into several systems according to its function, including: high-pressure gas system, high-pressure feeding system, high-pressure spraying system, among which,

[0051] The high-pressure gas circuit system (i.e., regulating gas circuit 2) includes the following facilities: gas filter 212, two-way ball valve 213, first pressure reducing valve 211, first pressure gauge 215, second pressure gauge 216, second pressure reducing valve 221, etc. The pressure adjustable range of the second pressure reducing valve 221 is from normal pressure to 10 MPa.

[0052] The high-pressure feeding system includes the following facilities: the second storage tank 5 as a detergent storage tank, a feeding pump 52, a liquid one-way valve 53, the first storage tank 1 as a buffer tank, etc. The volume of the first storage tank 1 is 25L.

[0053] The high-pressure spray system includes facilities such as an oil bath heater 8, a first storage tank 1, a flow control valve 111, a flow meter 112, a fourth pressure gauge 113, a spray head 12, a spray hood 6 as a visual protective cover, etc. The temperature adjustment range of the oil bath heater 8 is from room temperature to 200°C.

[0054] This device has the following excellent effects:

[0055] The spraying pressure is continuously controllable: the pressure reduction and back pressure design is adopted, the pressure is continuously adjustable and the control is precise, and the pressure control range of the second pressure reducing valve 221 (ie, the spraying pressure) is from normal pressure to 10 MPa.

[0056] Pressure-resistant buffer design: a pressure-resistant first storage tank 1 is used, and a safety valve 13 is provided, and the first storage tank 1 is directly placed in the oil bath heater 8. The temperature control range of the oil bath heater 8 is from room temperature to 200°C.

[0057] While ensuring that process parameters such as temperature and pressure are met, the device can effectively avoid the risk of detergent leakage, and repeated disassembly is simple and convenient; the first storage tank 1 has a built-in temperature measuring point, which can detect the detergent temperature in real time;

[0058] Separate gas circuit back pressure design: the back pressure gas circuit is connected in parallel with the liquid circuit of the detergent, and a gas one-way valve 214 is provided on the gas circuit of the gas source, so as to avoid the gas circuit being corroded by the strong acidic detergent and improve the back pressure stability.

[0059] The first storage tank 1 is resistant to strong acid corrosion: The first storage tank 1 adopts an integral polytetrafluoroethylene lining design, which is leak-proof, corrosion-resistant, safe and reliable.

[0060] Continuous liquid return design: Each pipeline can be a flexible pipeline, and the entire device is provided with a flexibly connected reflux loop. The detergent is recovered to the detergent storage tank through the reflux pump 62, and the detergent is sent to the first storage tank 1 through the feed pump 52 to achieve stable circulation of the detergent.

[0061] In general, by setting up a gas back pressure flow path, the gas is passed into the first storage tank 1 after the pressure is adjusted by the first pressure reducing valve 211, and at the same time flows to the second pressure reducing valve 221, and the pressure of the entire circuit is controlled by the second pressure reducing valve 221 to achieve the regulation of the pressure of the first storage tank 1. The first storage tank 1 is provided with a safety valve 13 for overpressure venting. When the pressure in the first storage tank 1 is greater than or equal to 10MPa, the safety valve 13 can play the role of overpressure venting, so that the pressure in the first storage tank 1 does not exceed its maximum design pressure of 10MPa. A three-way valve 222 is provided for venting to ensure safe operation in emergency accident conditions. The gas circuit and the liquid circuit are respectively provided with a gas one-way valve 214 and a liquid one-way valve 53 to prevent the backflow of high-pressure fluid; the liquid in the first storage tank 1 flows out through the bottom tube, and the outlet pipeline is provided with a flow control valve 111, a flow meter 112 and a fourth pressure gauge 113 to regulate the flow rate of the detergent and record the outflow pressure; the detergent spray area is provided with an acid-corrosion-resistant spray hood 6 as a protective hood; the waste liquid can be transported to the detergent storage tank by a reflux pump 62 through a low-pressure corrosion-resistant pipeline to realize the detergent circulation.

[0062] Example 2

[0063] The spraying method of this embodiment adopts the spraying device in Embodiment 1, and the method comprises the following steps:

[0064] Close the flow control valve 111 and make the internal pressure of the first storage tank 1 consistent with the external environmental pressure;

[0065] Feeding into the first storage tank 1 until the spraying liquid reaches the set amount;

[0066] Open the third pipeline 22 to inlet air;

[0067] Open the second pipeline 21 to allow air to enter, adjust the first pressure reducing valve 211 to a first set pressure, and adjust the second pressure reducing valve 221 to a second set pressure;

[0068] The flow control valve 111 is opened to perform spraying with the spraying liquid at the second set pressure and set flow rate.

[0069] In combination with the components of the device in Example 1, the specific operation process is as follows:

[0070] Preparation stage: Tighten the screws on the cover of the first storage tank 1, ensure that the flow control valve 111 of the first storage tank 1 is in a closed state, and the exhaust port of the vent pipe 4 is emptied (so that the internal pressure of the first storage tank 1 is consistent with the external environmental pressure). Prepare the detergent, and insert the inlet pipe of the feed pump 52 and the outlet of the reflux pump 62 into the detergent storage tank (the second storage tank 5) at the same time.

[0071] The workpiece 3 to be processed is fixed, and after adjusting the distance from the spray head 12, it is placed in a visual protective cover (spray cover 6).

[0072] Open the liquid one-way valve 53 at the outlet of the feed pump 52, start the feed pump 52, and pump about 10L into the first storage tank 1 normally.

[0073] The feed pump 52 is turned off.

[0074] Open the gas source of the gas cylinder, the gas can be air or nitrogen (this method uses high-pressure nitrogen), and adjust the first pressure reducing valve 211 to the required first set pressure.

[0075] Open the first two-way ball valve 213 on the gas source side of the first pressure reducing valve 211, and open the second two-way ball valve 217 on the other side of the first pressure reducing valve 211. At this time, if the air intake is large, a hissing sound of the gas check valve 214 can be heard.

[0076] While air is being taken in, the back pressure of the second pressure reducing valve 221 is turned to the required second set pressure.

[0077] The flow control valve 111 at the liquid outlet of the first storage tank 1 is opened until it is fully opened, and the detergent flows out to the spray head 12 to start spraying.

[0078] During the process, the reagent amount in the detergent storage tank is observed, and the amount of the detergent in the first storage tank 1 is controlled by the total amount. If the spray head 12 continues to emit gas and the pointer of the flow meter 112 swings greatly, it means that the detergent in the spray head 12 has been sprayed out and needs to be replenished in time.

[0079] The temperature control of the detergent is dynamically achieved through an external oil bath heater 8. Since the detergent flow is too large and the heat is seriously removed, the temperature control reaction can also be carried out by pre-adding the detergent and pre-heating.

[0080] Whether the feed pump 52 is turned on or off depends on the actual spraying amount of the spray head 12 used. When the spraying flow rate is too large, a detergent can be added to the first storage tank 1 in advance to achieve long-term continuous spraying.

[0081] Example 3

[0082] The spray test system of this embodiment includes a sample sheet and the continuous spray device in Embodiment 1. The sample sheet is set at the spray head 12 of the continuous spray device as a workpiece to be processed 3. The distance between the sample sheet and the spray head 12 can be adjusted by a slide rail, and the specific position can be adjusted by a hand-held ball screw.

[0083] Since the test system adopts the device in Example 1, it has the characteristics of safe and reliable test device: safety performance is particularly important for the test, and for this reason, a safety valve 13 is designed for the first storage tank 1. In order to further ensure the safety of the device, the spray area of ​​the system adopts a visual protective cover design, which is more conducive to the intuitive operation of the operator, ensuring the fluidity of the detergent and preventing the detergent from leaking, thereby ensuring the safety of the test personnel.

[0084] And there is the advantage of continuously adjustable spray distance: there is a test area equipped with a hand-cranked precision ball screw, the sample to be treated is placed on a slide rail with scale, and the spray distance can be selected from 0.1 to 3.5m.

[0085] This test system is a continuous spray test device with adjustable spray pressure, spray temperature and spray distance. The flow meter 112 is customized based on the principle of meeting the flow rate under the highest pressure of the 0.8mm-2mm aperture linear spray head 12. It includes three parts: high-pressure gas system, high-pressure feeding system and high-pressure spray system.

[0086] In combination with the components of the device in Example 1, the specific test operation process is as follows:

[0087] Preparation stage: Tighten the screws on the cover of the first storage tank 1, ensure that the flow control valve 111 of the first storage tank 1 is in a closed state, and the exhaust port of the vent pipe 4 is emptied (so that the internal pressure of the first storage tank 1 is consistent with the external environmental pressure). Prepare the detergent, add it to the detergent storage tank, and insert the inlet pipe of the feed pump 52 and the outlet of the reflux pump 62 into the detergent storage tank (second storage tank 5) at the same time.

[0088] Fix the workpiece 3 to be processed, adjust the distance from the spray head 12, and then put it into the visual protection cover (spray cover 6). That is, fix the sample sheet to the sample rod, adjust the sample holder distance to 0.5m, insert the sample rod into the sample holder, and put it into the visual protection cover at the same time.

[0089] Open the liquid one-way valve 53 at the outlet of the feed pump 52, start the feed pump 52, and pump about 10L into the first storage tank 1 normally.

[0090] The feed pump 52 is turned off.

[0091] Open the gas source of the gas cylinder, the gas can be air or nitrogen (high-pressure nitrogen is used in this test), and adjust the first pressure reducing valve 211 to the required first set pressure.

[0092] Open the first two-way ball valve 213 on the gas source side of the first pressure reducing valve 211, and open the second two-way ball valve 217 on the other side of the first pressure reducing valve 211. At this time, if the air intake is large, a hissing sound of the gas check valve 214 can be heard.

[0093] While air is being introduced, turn the back pressure of the second pressure reducing valve 221 to the required second set pressure, which is 0.5 MPa in this test.

[0094] The flow control valve 111 at the liquid outlet of the first storage tank 1 is opened until it is fully opened, and the detergent flows out to the spray head 12, and the spray test begins.

[0095] During the process, the reagent amount in the detergent storage tank is observed, and the amount of the detergent in the first storage tank 1 is controlled by the total amount. If the spray head 12 continues to emit gas and the pointer of the flow meter 112 swings greatly, it means that the detergent in the spray head 12 has been sprayed out and needs to be replenished in time.

[0096] The temperature control of the detergent is dynamically achieved through an external oil bath heater 8, and the test temperature is 15°C in this test. Since the detergent flow is too large and the heat is seriously removed, the temperature control reaction can also be carried out by pre-adding detergent and pre-heating.

[0097] The test system of this embodiment can also select a second set pressure of 1.0 MPa and a heating temperature of 20°C when the distance between the sample piece and the shower head 12 is 2.0 m; and select a second set pressure of 2.0 MPa and a heating temperature of 30°C when the distance between the sample piece and the shower head 12 is 3.5 m; keep the other test conditions unchanged.

[0098] The above tests have verified that the test system can achieve continuous pressure control, continuous temperature change, and continuous flow control. At the same time, the examples show that under corresponding test conditions, the detergent can be sprayed onto the sample sheet normally, and the sample sheet can be spray cleaned.

[0099] Example 4

[0100] The nuclear facility decontamination system of this embodiment includes metal equipment and the continuous spraying device in Embodiment 1. The metal equipment serves as the workpiece 3 to be processed, and the spray head 12 of the continuous spraying device is arranged on the surface of the metal equipment that is contaminated by radioactivity.

[0101] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A continuous spraying device, characterized in that: It comprises a first storage tank (1) and a regulating gas circuit (2), The first storage tank (1) stores a spraying liquid. The first storage tank (1) is connected to a first pipeline (11). A spray head (12) facing the workpiece (3) to be processed is arranged at the end of the first pipeline (11). A flow control valve (111) is arranged on the first pipeline (11). The regulating gas circuit (2) comprises a second pipeline (21) and a third pipeline (22); the second pipeline (21) is connected to the gas source and the first storage tank (1); the second pipeline (21) is provided with a first pressure reducing valve (211) for allowing gas at a first set pressure to enter the first storage tank (1); The third pipeline (22) is connected to the first storage tank (1) and the vent pipe (4). The third pipeline (22) is provided with a second pressure reducing valve (221) for allowing the liquid in the first storage tank (1) to reach the spray head (12) through the first pipeline (11) at a second set pressure under the action of the gas entering the first storage tank (1).

2. The continuous spraying device according to claim 1, characterized in that: The system further comprises a control system, wherein a second pressure gauge (216) is provided at the first pressure reducing valve (211) of the second pipeline (21). A fourth pressure gauge is provided at the flow control valve (111) of the first pipeline (11), The control system is electrically connected to the second pressure gauge (216), the first pressure reducing valve (211), the fourth pressure gauge (113) and the second pressure reducing valve (221), respectively, and is used to control the opening of the first pressure reducing valve (211) according to the indication of the second pressure gauge (216), so that the indication of the second pressure gauge (216) is maintained at the first set pressure, and, for controlling the opening of the second pressure reducing valve (221) according to the indication of the fourth pressure gauge (113), so that the indication of the fourth pressure gauge (113) is maintained at the second set pressure, And the second set pressure is not higher than the first set pressure.

3. The continuous spraying device according to claim 2, characterized in that: The ends of the second pipeline (21) and the third pipeline (22) disposed in the first storage tank (1) are both located at the top of the first storage tank (1). The end of the first pipeline (11) disposed in the first storage tank (1) is located below the liquid level of the spraying liquid.

4. The continuous spraying device according to claim 1 or 3, characterized in that: The apparatus further comprises a second storage tank (5), wherein the second storage tank (5) is used to store the spraying liquid, and the second storage tank (5) is connected to the first storage tank (1) via a fourth pipeline (51). The fourth pipeline (51) is provided with a feed pump (52) for supplying spraying liquid into the first storage tank (1).

5. The continuous spraying device according to claim 4, characterized in that: It also includes a spray hood (6), wherein the spray head (12) and the workpiece (3) to be processed are both arranged in the spray hood (6), and the spray hood (6) is connected to the second storage tank (5) through a fifth pipeline (61). The fifth pipeline (61) is provided with a reflux pump (62) for conveying the spraying liquid after spraying to the second storage tank (5).

6. The continuous spraying device according to claim 5, characterized in that: The end of the fifth pipeline (61) disposed in the spray hood (6), the end of the fourth pipeline (51) disposed in the second storage tank (5), and the end of the first pipeline (11) disposed in the first storage tank (1) are all provided with filter heads (7) for filtering the spray liquid.

7. The continuous spraying device according to claim 1, characterized in that: The first storage tank (1) is provided with a safety valve (13) for opening when the pressure in the first storage tank (1) exceeds a third set pressure.

8. The continuous spraying device according to claim 1, characterized in that: The third pipeline (22) is also provided with a three-way valve (222). The three interfaces of the three-way valve (222) are respectively connected to the first storage tank (1), the second pressure reducing valve (221) and the atmosphere, and under normal working conditions, the first storage tank (1) and the second pressure reducing valve (221) are connected. In the event of an accident, the first storage tank (1) is directly connected to the atmosphere for emergency gas release and pressure reduction.

9. The continuous spraying device according to claim 1, characterized in that: An oil bath heater (8) is also provided outside the first storage tank (1) for heating the first storage tank (1) so as to keep the spraying liquid in the first storage tank (1) at a set temperature.

10. A spraying method, characterized in that: Using the continuous spraying device according to any one of claims 1 to 9, the method comprises the following steps: Closing the flow control valve (111) and making the internal pressure of the first storage tank (1) consistent with the external environmental pressure; Feeding material into the first storage tank (1) until the spraying liquid reaches a set amount; Opening the third pipeline (22) for air intake; Open the second pipeline (21) to allow air to enter, adjust the first pressure reducing valve (211) to a first set pressure, and adjust the second pressure reducing valve (221) to a second set pressure; The flow control valve (111) is opened to complete spraying with the spraying liquid having a second set pressure and a set flow rate.

11. A spray test system, characterized in that: A method comprising: comprising a sample sheet and a continuous spraying device according to any one of claims 1 to 9, The sample sheet is arranged as a workpiece (3) to be processed at the position of a spray head (12) of a continuous spraying device.

12. A nuclear facility decontamination system, characterized in that: The invention comprises a metal device and a continuous spraying device as claimed in any one of claims 1 to 8, The metal equipment is used as a workpiece to be processed (3), The spray head (12) of the continuous spray device is arranged on the surface of the metal equipment that is contaminated by radioactivity.

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