CN104190676B - The cleaning of nuclear power station pipeline inner wall corrosion product and coating coating unit - Google Patents

Abstract

The invention relates to a device for cleaning and coating corrosion products on the inner wall of a nuclear power plant pipeline, comprising a main gas path, a gas supply system, a sand adding system, a water adding system, a coating system, and a control system; the front end of the main gas path is connected to the gas supply system The rear end forms a sinking section and is connected to the pipeline; the main air circuit is equipped with a main purge valve; the sand adding tank is included in the sand adding system, and the sand adding port of the sand adding tank is equipped with a sand valve, and the sand outlet passes through The lower sand valve is connected to the main gas circuit; the water adding system includes a water tank, the water inlet of the water tank is provided with an upper water valve, and the water outlet is connected to the main gas circuit through the lower water valve; the coating system is connected to the subsidence of the main gas circuit. The front end of the section includes the coating funnel, and the outlet of the coating funnel is connected to the main air circuit through the coating valve; the control system is connected with the main purge valve, sand valve, sand valve, water valve and water valve respectively. connect. The invention can not only realize the cleaning of the inner wall of the pipeline, but also realize the coating of the paint on the inner wall of the pipeline, and has a wide range of application.

Description

Equipment for cleaning and coating corrosion products on the inner wall of nuclear power plant pipelines

technical field

The invention relates to a device for cleaning corrosion products on the inner wall of a pipeline and coating the inner wall of the pipeline, and is especially suitable for small-diameter, curved and variable-diameter pipelines in nuclear power plants.

Background technique

Pipelines with a diameter of less than 500mm are generally summarized as small-diameter pipes in engineering. Pipes made of carbon steel, cast iron, and stainless steel will have corrosion and fouling problems inside after long-term use, which will affect the water flow of the pipes, and even cause problems such as blockage or corrosion perforation.

Because the caliber is too small and people cannot reach it, the comprehensive treatment of corrosion of small-diameter pipelines is a world-class problem. At present, there are dozens of cleaning and repairing technologies for in-service pipelines in the world, and the summary mainly includes five categories: chemical method (pickling, etc.), vibration method (ultrasonic, etc.), electromagnetic method (electric shock, magnetization, etc.), bushing method (interspersed with soft and hard pipes, etc.), mechanical methods (built-in tools, robots, etc.).

The first three methods only have the function of cleaning and dredging the pipeline, without the function of transformation and strengthening, and there are disadvantages such as chemical residue, incomplete cleaning, and inability to coat the inner wall. Commonly used chemical cleaning methods require a large amount of chemical substances and long-term soaking reactions to clean the rust on the surface of the pipeline. For oil stains and other foreign objects, the cleaning agent needs to be replaced, which consumes a lot of manpower, material resources and time. The resulting waste will also pollute the environment. The latter two methods not only have the function of cleaning and dredging the pipeline, but also have the function of reforming and strengthening, and can coat the inner wall of the pipeline. However, these two methods still encounter four major problems that are difficult to overcome: pipeline turning, pipeline deformation diameter, pipe vertical, and small-diameter pipes, so the practical application is greatly limited.

Contents of the invention

The purpose of the present invention is to provide a cleaning and coating device for cleaning and coating corrosion products on the inner wall of nuclear power plant pipelines, which has the function of cleaning and dredging, and has the function of coating coating, and has a wide range of applications.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A device for cleaning and coating corrosion products on the inner wall of a nuclear power plant pipeline, used for purging and cleaning corrosion products on the inner wall of a nuclear power plant pipeline and coating the inner wall, which includes a main gas circuit, a gas supply system for gas supply, Sand adding system for sand supply, water adding system for water supply, coating system for paint supply and control system;

The front end of the main gas path is connected to the gas supply system, and the rear end of the main gas path forms a sinking section and is connected to the pipeline to be cleaned after the sinking section; the There is a main purge valve on the main gas line;

The sand adding system and the water adding system are respectively connected to the middle of the main gas circuit and located behind the main purge valve;

The sand adding system includes a sand adding tank with a sand adding port and a sand outlet, the sand adding port of the sand adding tank is provided with an upper sand valve, and the sand outlet of the sand adding tank is passed through the lower sand valve Connected with the main air circuit, the sand tank is also connected with a sand return air passage for adjusting the air pressure therein;

The water adding system includes a water adding tank with a water inlet and a water outlet, the water inlet of the water adding tank is provided with an upper water valve, and the water outlet of the water adding tank is connected to the main air circuit via a lower water valve , the water adding tank is also connected with a water return air passage for adjusting the air pressure therein;

The coating system is connected to the front end of the sinking section of the main air circuit, which includes a coating funnel with a discharge port, and the discharge port of the coating funnel is connected to the main Gas path connection;

The control system is respectively connected with the main purge valve, the sand-up valve, the sand-down valve, the water-up valve, and the water-down valve.

Preferably, the rear end of the main air circuit is connected to the pipeline to be cleaned through a rubber tube.

Preferably, the air supply system includes a compressed air tank with an air inlet and an air outlet, the air inlet of the compressed air tank is connected to the compressed air source, and the air outlet of the compressed air tank is connected to the The main gas path described above is connected.

Preferably, the sand adding system further includes a sand adding funnel, and the sand adding funnel is connected to the sand adding port of the sand adding tank through the sand loading valve.

Preferably, the water adding system further includes a water adding funnel, and the water adding funnel is connected to the water adding port of the water adding tank through the water supply valve.

Preferably, the sand return passage and the water return passage are respectively connected to the main air passage, and the sand return passage is provided with a sand return passage controlled by the control system. Valve, the water return air passage is provided with a water return valve controlled by the control system.

Preferably, the control system includes a PLC, an interactive device connected to the PLC, and a power supply for the PLC and the interactive device.

Preferably, the sinking angle of the sinking section on the main gas path is 45°.

Preferably, both sides of the main purge valve are connected with a bypass air path, and a bypass valve controlled by the control system is arranged on the bypass air path.

Preferably, it also includes several pressure transmitters, each of which is connected to the control system.

The working principle of the present invention is: the gas provided by the gas supply system drives the sand provided by the sand adding system and the water provided by the water accumulation system to enter the pipeline to be cleaned together, and the corrosion products are cleaned on the inner wall of the pipeline; after the inner wall of the pipeline is dried, Then, the gas provided by the gas supply system drives the paint provided by the coating system into the pipeline to be cleaned, and paints the inner wall of the pipeline.

Due to the application of the above-mentioned technical scheme, the present invention has the following advantages compared with the prior art: the present invention can realize the cleaning of the corrosion products on the inner wall of the pipeline first, and can also realize the coating of the inner wall of the pipeline, that is, it has the advantages of cleaning It has the function of dredging, but also has the function of transformation and strengthening. The elbows, variable diameters, horizontal pipes, and vertical pipes of the pipeline are not affected, and it has a wide range of applications.

Description of drawings

Accompanying drawing 1 is the structural representation of the present invention.

Accompanying drawing 2 is the work flowchart of the present invention.

detailed description

The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

Embodiment 1: Refer to the accompanying drawing 1. A nuclear power plant pipe inner wall corrosion product cleaning and coating device, which includes a main gas circuit, a gas supply system for gas supply, a sand addition system for sand supply, a water addition system for water supply, a coating system for paint supply, and a control system.

The two ends of the horizontally arranged main air path are respectively referred to as the front end and the rear end, so the "front" and "rear" mentioned below refer to the front end and the rear end of the main air path. The front end of the main air circuit is connected with the air supply system. The air supply system includes a compressed air tank with an air inlet and an air outlet. The air inlet of the compressed air tank is connected to the compressed air source provided by the oil-free air compressor. The air outlet of the compressed air tank is connected to the main The gas path is connected. A safety valve is provided on the compressed air tank. The rear end of the main air circuit forms a sinking section with a sinking angle of 45°, and after the sinking section, it is connected with the pipeline to be cleaned through a high-pressure wear-resistant rubber tube. The two ends of the sinking section are respectively passed through the inner flange and The second flange is connected with other parts of the main air circuit and the rubber tube. The main gas line is provided with a main purge valve and an emergency stop valve, and the emergency stop valve is located at the front end of the main purge valve. Both sides of the main purge valve are also connected with a bypass air path, and a bypass valve is arranged on the bypass air path.

The sand adding system and the water adding system are respectively connected to the middle of the main gas circuit and located after the main purge valve. The sand adding system includes a sand adding tank with a sand adding port and a sand outlet, and a sand adding funnel. The sand filling funnel is connected with the sand filling port of the sand filling tank, and the sand filling port of the sand filling tank is provided with a sand valve, which can be set on the pipeline between the sand filling funnel and the sand filling port of the sand filling tank . The sand outlet of the sand adding tank is connected to the main gas circuit through the sand lowering valve, and the sand outlet of the sand adding tank is also connected to the main gas circuit through a pipeline, and the sand lowering valve is arranged on the pipeline. The sand adding tank is also connected with a sand return passage for adjusting the air pressure therein, the sand return passage is connected with the front end of the main purge valve on the main air circuit, and a sand return valve is arranged on the sand return passage. The water adding system includes a water adding tank with a water inlet and a water outlet, and a water adding funnel. The water adding funnel is connected to the water adding port of the water adding tank. on the pipeline between the water inlets. The water outlet of the water adding tank is connected with the main air circuit via the water valve, and the water outlet of the water adding tank is also connected through a pipeline, and the water valve is arranged on the pipeline. The water adding tank is also connected with a water return air passage for adjusting the air pressure therein, the water return air passage is connected with the main air circuit, and the water return air passage is provided with a water return air valve. One end of the water return air passage connected to the main air passage and one end of the sand return air passage connected to the main air passage can be combined into one pipeline.

The coating system is connected to the front end of the sinking section of the main air circuit, which includes a coating funnel with a discharge port. The discharge port of the coating funnel is connected to the main gas circuit through a coating valve. It is also connected to the main air circuit through the pipeline, and the paint valve is set on the pipeline.

The control system includes a PLC, an interactive device connected to the PLC, and a power supply for the PLC and the interactive device. Among them, the control program of the whole set of devices is written in the PLC; the power supply uses a 24V battery, which has a charging interface that can be connected to an AC power supply; the interactive device uses an HMI touch screen. The PLC in the control system is respectively connected with the main purge valve, upper sand valve, lower sand valve, upper water valve, lower water valve, emergency stop valve, sand return valve, water return valve and bypass valve and controls their Open and close for control. The above valves are all pneumatic ball valves, and the power required by the electromagnetic actuators is also supplied by 24V batteries, while the external air source comes from the pneumatic valve header, and the pneumatic valve header is connected to the pipeline with the third flange as the connecting piece. The compressed air tanks in the air supply system are connected, and the header air supply valve is set on the pipeline. The paint valve is a manual ball valve.

The device is also equipped with a number of pressure transmitters connected with the PLC of the control system, which are: (1) the first sensor for detecting the gas pressure at the front end of the main purge valve and the emergency stop valve in the main gas circuit, and at the rear end of the compressed gas tank. One pressure transmitter; (2) The second pressure transmitter to detect the gas pressure at the rear end of the main purge valve and the front end of the sinking section of the main gas circuit; The third pressure transmitter for the gas pressure at the merged pipeline; (4) The fourth pressure transmitter for detecting the air pressure in the sand tank; (5) The fifth pressure transmitter for detecting the air pressure in the water tank . These pressure transmitters transmit the detected pressure values to the PLC of the control system, and the PLC controls the whole set of devices to work according to these pressure values.

Before using this device, it is necessary to select different models of this device according to the diameter of the pipes to be treated on site. The pipe diameter must be the same as the bottom pipe diameter of the pipe to be cleaned. Take the DN100 caliber pipeline as an example, select one entrance and one exit of the pipeline, the total length of the pipeline between the entrance and exit should not exceed 2000 times the diameter of the pipeline, that is, within 200 meters, and isolate all branch pipes along the way. The device is connected to the inlet of the pipeline through a high-pressure wear-resistant rubber tube, and the outlet of the pipeline is connected to a special waste collection box for collecting the cleaned corrosion products and sewage on the inner wall of the pipeline.

The workflow of the device is shown in Figure 2. First turn on the air compressor, supply compressed air to the compressed air tank, make the pressure in the compressed air tank reach above 0.65MPa, and then start to purge the pipeline, the process is as follows: first open the emergency stop valve and close other valves and lock them , It is forbidden to use the HMI touch screen to operate the PLC. Then, check whether the pressure in the sand adding tank and the water adding tank is less than 0.15 MPa, if so, then add sand and water to the sand adding tank and add water to the water adding tank; Make the pressure in the sand adding tank and the water adding tank drop to 0.15MPa or below, and then close the sand lowering valve and the water lowering valve, then you can add sand to the sand adding tank and water to the water adding tank. Then, add sand to the sand tank and add water to the water tank, open the sand valve and the water valve respectively, wait until the sand tank and the water funnel are manually added to the sand tank and water through the sand funnel and water tank respectively, and then add water to the sand tank. Close the sand valve and water valve after finishing. The PLC can judge whether the sand and water addition is completed by detecting whether the sand feeding valve and the water feeding valve complete an opening and closing action. After adding, lock the sand valve and water valve and wait for the follow-up operation.

The process of purging and cleaning corrosion products on the inner wall of the pipeline in the nuclear power plant is as follows: select the purge mode and perform the purge and clean operation when the main pressure in the compressed gas tank is greater than 0.65MPa. Open the sand return valve and the water return valve to fill the sand tank and water tank with gas, and perform the next step when the pressure in the sand tank and water tank is consistent with the main air pressure. Open the sand valve and the water valve at the same time, and open the main purge valve after a delay of 0.5 seconds. At this time, the gas provided by the gas supply system enters through the main gas path together with the sand provided by the sand tank and the water provided by the water tank. Into the pipeline to be cleaned and flow, so as to sand the inner wall of the pipeline to remove dirt and purge and flush. During this process, the main air pressure gradually decreases. When the air pressure at the air outlet of the main air circuit is consistent with the main air pressure and less than 0.3MPa, the purging and cleaning process is completed. Generally, a pipeline needs to be purged and cleaned at least 8 times.

After all the purge and cleaning are completed, use manual control to keep the emergency stop valve and the main purge valve normally open, and use the compressed air provided by the air supply system to continuously blow the pipeline for more than 30 minutes to dry the inner wall of the pipeline and paint the inner wall of the pipeline. ready for coating.

After drying in the pipeline, use manual control to close all valves except the emergency stop valve, and add the stirred paint through the paint funnel. The material can flow to the back end of the main gas circuit without polluting other parts of the main gas circuit. After the coating is installed, when the main air pressure reaches above 0.65MPa, slowly open the bypass valve manually, and when the outlet pressure of the main air circuit rises to above 0.5MPa, open the main purge valve to spray the paint for the first time. When the main air pressure drops below 0.4MPa, close the bypass valve and the main purge valve, and when the main air pressure returns to above 0.65MPa, only open the main purge valve for the second paint spraying, and follow the second paint spraying The process of spraying the paint several times until the paint spraying reaches 4 to 5 times in total, and the paint coating coating of the inner wall of the pipeline in the nuclear power plant is completed.

This device is especially suitable for cleaning the corrosion products or dirt on the inner wall of the pipes of nuclear power plants, such as SEP (drinking water system), JPD, JPP, JPH (fire protection system), GFR (turbine security oil system), etc. And can carry out inner wall coating. Compared with the existing five pipeline cleaning and repair methods, it has dual functions and has no special requirements on the form of the pipeline, so it has a wide range of applications.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention shall fall within the protection scope of the present invention.

Claims (10)

1. A nuclear power plant pipeline inner wall corrosion product cleaning and coating coating device is used for purging and cleaning corrosion products and coating coatings on the inner wall of the pipeline in a nuclear power plant. It is characterized in that: it includes a main gas circuit, a supply Gas supply system, sand supply system, water supply system, paint coating system and control system; The front end of the main gas path is connected to the gas supply system, and the rear end of the main gas path forms a sinking section and is connected to the pipeline to be cleaned after the sinking section; the There is a main purge valve on the main gas line; The sand adding system and the water adding system are respectively connected to the middle of the main gas circuit and located behind the main purge valve; The sand adding system includes a sand adding tank with a sand adding port and a sand outlet, the sand adding port of the sand adding tank is provided with an upper sand valve, and the sand outlet of the sand adding tank is passed through the lower sand valve Connected with the main air circuit, the sand tank is also connected with a sand return air passage for adjusting the air pressure therein; The water adding system includes a water adding tank with a water inlet and a water outlet, the water inlet of the water adding tank is provided with an upper water valve, and the water outlet of the water adding tank is connected to the main air circuit via a lower water valve , the water adding tank is also connected with a water return air passage for adjusting the air pressure therein; The coating system is connected to the front end of the sinking section of the main air circuit, which includes a coating funnel with a discharge port, and the discharge port of the coating funnel is connected to the main Gas path connection; The control system is respectively connected with the main purge valve, the sand-up valve, the sand-down valve, the water-up valve, and the water-down valve. 2. The device for cleaning and coating corrosion products on the inner wall of nuclear power plant pipelines according to claim 1, characterized in that: the rear end of the main gas circuit is connected to the pipeline to be cleaned through a rubber tube. 3. The corrosion product cleaning and coating coating device for the inner wall of nuclear power plant pipeline according to claim 1, characterized in that: the gas supply system includes a compressed gas tank with an air inlet and an air outlet, and the compressed gas The air inlet of the tank is connected with the compressed air source, and the air outlet of the compressed air tank is connected with the main air circuit. 4. The device for cleaning and coating corrosion products on the inner wall of nuclear power plant pipelines according to claim 1, characterized in that: the described sand adding system also includes a sand adding funnel, and the described sand adding funnel passes through the described upper sand The valve is connected to the sand filling port of the sand filling tank. 5. The device for cleaning and coating corrosion products on the inner wall of nuclear power plant pipelines according to claim 1, characterized in that: the described water adding system also includes a water adding funnel, and the described water adding funnel is connected to the The water filling port of the water filling tank. 6. The device for cleaning and coating corrosion products on the inner wall of nuclear power plant pipelines according to claim 1, characterized in that: the sand return air passage and the water return air passage are respectively connected to the main air passage Connected, the sand return air passage is provided with a sand return air valve controlled by the control system, and the water return air passage is provided with a water return air valve controlled by the control system. 7. The corrosion product cleaning and coating coating device for the inner wall of nuclear power plant pipeline according to claim 1, characterized in that: the control system includes a PLC, an interactive device connected with the PLC, and the PLC and the power supply for the interaction device. 8. The device for cleaning and coating corrosion products on the inner wall of nuclear power plant pipelines according to claim 1, characterized in that: the sinking angle of the sinking section on the main gas path is 45°. 9. The device for cleaning and coating corrosion products on the inner wall of nuclear power plant pipelines according to claim 1, characterized in that: a bypass air path is connected to both sides of the main purge valve, and the bypass air path is provided with A bypass valve controlled by the control system described. 10. The device for cleaning and coating corrosion products on the inner wall of nuclear power plant pipelines according to claim 1, characterized in that: it also includes several pressure transmitters, each of the pressure transmitters and the control system connected.