CN115290543A - A test device and method based on real working conditions of boiler field pipeline service - Google Patents

Abstract

The invention discloses a testing device and a testing method based on real service conditions of a boiler field pipeline. The invention relates to a test device and a method based on the boiler field pipeline service real working condition, wherein a pipeline bypass corrosion and protection detection system is adopted for corrosion test, a test piece can reflect all information of internal and external corrosion of a boiler pipeline, the test piece is made into a detachable structure, the test piece can be conveniently detached for detection and then installed at any time during boiler shutdown maintenance, the service safety of a boiler is improved, and a reliable guarantee effect is achieved for avoiding non-regular boiler shutdown emergency repair caused by pipe explosion and leakage.

Description

A test device and method based on the real working conditions of the boiler on-site piping service

technical field

The invention relates to the technical field of boiler pipe coating, in particular to a test device and a method thereof based on the actual working conditions of the boiler on-site pipe service.

Background technique

With the accelerated implementation of the country's new energy development strategy, the domestic waste incineration power generation industry has developed rapidly in recent years. At present, the bottleneck problem restricting the technical development of waste incineration power generation is due to the large amount of corrosive gas generated during the waste incineration process. Water walls, superheaters, reheaters, and economizers) are severely corroded at high temperatures, and corrosion thinning leads to frequent tube bursts. The main components of corrosive gases are HCl, Cl ₂ , SO ₂ , H ₂ S, etc., and a large amount of molten alkali metal salts with low melting point are deposited on the heating surface, resulting in double corrosion of gas phase and liquid phase. In addition, in many cases, the heating surface of some pipelines is thickly covered by ash and slagging in the high-temperature flue gas, resulting in double corrosion in the gas phase and solid phase. Coating technology is generally used for surface protection at home and abroad. At present, most enterprises adopt the method of surfacing welding inconel625 alloy to improve its corrosion resistance. In recent years, induction welding is used to prepare coatings on the surface of pipe rows. The protective effect is not worse than surfacing welding, and the production efficiency and cost are more advantageous than surfacing welding. , has good development prospects, and some companies use supersonic flame spraying (HVOF) to prepare coatings, but the deposition rate is low, the cost is high and the application is limited, and a few manufacturers use arc spraying for protection in order to reduce costs. High efficiency and low bonding strength, so it is rarely used. In addition, some manufacturers use high-temperature coatings on the surface for protection, but because the coating is thin and easy to fall off, it often needs to be recoated, resulting in inconvenient maintenance. There are also some scholars who have developed laser cladding technology. Although it has a certain effect, it is still in the stage of laboratory research. With the continuous development of science and technology, people have higher and higher requirements for the test of the real working conditions of boiler on-site pipeline service.

There are certain disadvantages in the existing tests on the real working conditions of the boiler on-site pipeline service. As the development bottleneck of the boiler corrosion protection faced by the waste-to-energy power station, an important problem that needs to be solved urgently is how to objectively and scientifically solve the problem of various coating protection methods. to evaluate. As a waste power station, I hope to choose a coating protection method that is most suitable for me and cost-effective. Up to now, domestic and foreign evaluations on the high-temperature anti-corrosion performance of various coatings for waste incineration boiler pipes are limited to the following two methods. First, the corrosion simulation test based on the laboratory is also the test used by most people. Methods, almost all related research papers are also based on laboratory research results, that is, in the laboratory, several main corrosive gases of waste incineration such as HCl, Cl ₂ , SOx, etc. are introduced into the tube furnace in different proportions, and the furnace is put into The test piece is taken as a sheet or taken from the boiler pipe, and then heated for corrosion test. However, this simulated corrosion test is very different from the actual situation, which is not conducive to people's use. Second, the actual furnace hanger corrosion test is used, that is, the sheet or tubular test piece is hung at a certain position near the pipeline in the boiler. The furnace has experienced the corrosion process of high-temperature flue gas. Although the corrosion environment of the flue gas in the boiler is more realistic than that in the laboratory, the problem is also very prominent: First, there is a difference in the flow of working fluid in the test piece and the actual water-cooled wall tube. larger. The fast-flowing water vapor in the actual pipe can take away part of the high-temperature heat from the outer wall, so that the temperature of the inner wall of the pipe can be kept basically constant, that is, no matter how high the flue gas temperature is, the temperature of the pipe wall is only 30°C higher than the temperature of the water vapor inside the pipe -50°C; Second, the reason for the final explosion of the metal pipe is that in addition to the high-temperature flue gas corrosion on the outer wall, there is also the continuous impact of high-temperature and high-pressure steam inside the pipe, which causes the metal pipe wall material to bear tensile stress, and is caused by fatigue, high temperature Creep and other factors cause microcracks to expand and produce oxide scales, which will gradually fall off after a period of operation, coupled with the corrosion and thinning of the outer wall, these factors are superimposed to produce a burst tube, which brings certain problems to people's use. The above two test methods have relatively large errors, and the resulting test results are likely to mislead researchers' understanding of the corrosion performance and mechanism of protective materials, which may lead to erroneous evaluation of the protective effect of the coating. To this end, we propose a test device and method based on the real working conditions of boiler piping in service.

Contents of the invention

(1) Solved technical problems

Aiming at the deficiencies of the prior art, the present invention provides a test device and method based on the real working conditions of boiler pipelines in service. The pipeline bypass corrosion and protection detection system is used to conduct corrosion tests, and the test pieces can reflect the internal and external corrosion of boiler pipelines. All information is true and reliable. The test piece is made of a detachable structure. As long as the furnace is shut down for maintenance, the test piece can be easily removed for inspection and subsequent installation at any time, which improves the service safety of the boiler and is helpful for avoiding tube bursts and leaks. The irregular shutdown of the boiler for emergency repair plays a reliable guarantee role and can effectively solve the problems in the background technology.

(2) Technical solution

In order to achieve the above object, the technical solution adopted by the present invention is: a test device based on the real working conditions of the pipeline on the boiler site, including the pipeline, welding port, valve, left valve switch wrench, pipeline test piece, left and right pipe butt joints, environment Temperature measuring instrument, fixing nut, elbow, right valve switch wrench, switch wrench fixing screw and camera, the pipe test piece is located at both ends of the left and right pipe butt joints, and the camera and ambient temperature measuring instrument are installed on the left and right pipe butt joints On the device, fixed nuts are installed at both ends of the pipe test piece, valves are respectively connected to the two ends of the pipe test piece, and the left valve switch wrench, right valve switch wrench, bent Head, switch wrench, fixing screws, welding joints and pipes.

As a preferred technical solution of the present application, the left and right pipe butt joints are positioned and connected to the pipe test piece, the left and right pipe butt joints are positioned and installed with the camera and the ambient temperature measuring instrument, and the left and right pipe butt joints are positioned and installed. Both ends are positioned and connected with the position of the valve through the pipe test piece and the fixing nut.

As a preferred technical solution of the present application, the valve is installed between the left valve switch wrench and the right valve switch wrench, and the left valve switch wrench and the right valve switch wrench respectively control the positions of the two groups of valves. The valve is connected with the pipe through the welding port.

As a preferred technical solution of the present application, the pipeline test piece is a detachable structure, and the position of the valve is closed when the pipeline test piece is disassembled, and the normal operation of the main pipeline is not affected during the disassembly process of the pipeline test piece. mass flow.

As a preferred technical solution of the present application, a detection platform is provided on the transition connector housing of the pipeline test piece, and a temperature sensor and a corrosion form monitor on the outer wall of the pipe are installed on the detection platform.

A test method based on the actual service conditions of boiler piping on site, including the following steps:

S1: Liquid/gas transmission control: Drill two holes at a distance from each other on the water wall or superheater pipe, weld two pipes in the vertical direction of the hole or at a certain angle such as 60°, and the other end of the pipe is threaded Connect the valve, close the valve before disassembling and installing the test piece, disconnect the liquid/gas phase of the boiler tube, and then open it after the corrosion test starts, the liquid/gas flowing out of the pipeline enters the bypass test system after passing through the valve;

S2: Tubular test piece installation: The internal tubular test piece of the bypass test system is divided into left and right sections for corrosion comparison test. Both ends of each tubular test piece are processed with threads, one end is fixedly connected to the elbow, and the other end is connected to the transition connection device;

S3: Transition connector installation: Due to the needs of corrosion test detection, the tubular test piece is equipped with a transition connector, and the transition connector of the test piece is equipped with elastic materials to ensure that the tubular test piece can be realized under the condition of the allowable centering error limit. Firmware connection;

S4: Pipeline real-time monitoring: Install an ambient temperature infrared tester on the upper end of the transition connector of the test piece, which mainly tests the instantaneous temperature of the boiler flue gas. There is a chip inside to store temperature data. On both sides of the tester, it can be connected according to requirements. Fix the miniature camera, aim the lens at the outer wall of the tubular test piece, observe the corrosion, dust accumulation, thickness change, etc. of the outer wall of the tube in real time, and store the image data in the chip;

S5: Data monitoring and transmission: Both chips have the function of remote data transmission. When the test piece is disassembled, the data chip with the flue gas temperature change history is taken out. After processing, it can be used for corrosion performance evaluation and corrosion mechanism research. During the working period of the boiler, the temperature data is remotely transmitted to the computer or mobile phone of the scientific and technical personnel in real time for real-time monitoring, so as to achieve the purpose of the real working condition test of the boiler on-site pipeline service.

As a preferred technical solution of the present application, the test method for the real working conditions of the boiler on-site pipeline uses a pipeline bypass corrosion and protection detection system for corrosion tests, and the test piece is made into two sections with exactly the same structural size as the actual pipeline.

As a preferred technical solution of the present application, the test method for the actual working condition of the boiler on-site pipeline includes determining the location of the corrosion test, performing pipeline bypass corrosion and protection detection operations, connecting the bypass system, and performing corrosion detection.

(3) Beneficial effects

Compared with the prior art, the present invention provides a test device and its method based on the real working conditions of boiler on-site pipeline service, which has the following beneficial effects: the test device and its method based on the real working conditions of boiler on-site pipeline service , the pipeline bypass corrosion and protection detection system is used for corrosion test. The test piece is made into two sections with the same structural size as the actual pipeline (water wall/superheater/reheater); The working fluid is a liquid for the water wall and a gas for the superheater/reheater. The temperature and pressure of the working fluid in the tubular test piece are exactly the same, as well as the cracks caused by water vapor corrosion, scale formation, fatigue and high temperature creep of the inner wall material of the tube, which are exactly the same as the real situation; at the same time, the outer wall of the tubular test piece is completely exposed to the boiler In the high-temperature flue gas inside, the corrosion situation is exactly the same as the actual working condition. Therefore, the test piece can reflect all the information of the internal and external corrosion of the boiler pipe, which is true and reliable. The test piece is made of a detachable structure. Remove the test piece for inspection and subsequent installation. Close the valve before dismantling and installing the test piece, so the dismantling and assembling process will not affect the normal working fluid flow of the main pipeline. A detection platform is set on the upper surface of the transition connector shell of the test piece, and a temperature sensor is installed on the platform And the pipe outer wall corrosion form monitor, which plays the role of comprehensive detection and real-time monitoring of corrosion status. After the test piece is removed, the chip recording unit in the detector is also taken out at the same time for comprehensive analysis. If the energy spectrum and X-ray diffraction image analysis are combined, the full cycle law of the corrosion process of the pipe wall can be obtained, which is of great value for in-depth research on the mechanism of corrosion thinning and bursting, discussing the protective performance of the coating, and predicting the remaining life of the pipe. The second function of the bypass system is to monitor the service conditions of the pipeline, which can also be called a pipeline safety monitoring system. Since the bypass detection system is often installed in the position where the flue gas temperature of the boiler pipe is the highest and the corrosion is the most serious, it also represents the weakest point in the boiler. When it is observed that the tubular test piece is corroded and thinned to a certain extent, an early warning should be given in time to remind the operator to replace or deal with it soon. Thereby, the service safety of the boiler can be greatly improved, and it has played a reliable role in avoiding the non-standard shutdown and emergency repair caused by tube burst and leakage. The effect is better than the traditional method.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of a test device and its method based on the real working conditions of boiler field pipelines in service according to the present invention.

Fig. 2 is a schematic diagram of the principle of the pipeline bypass corrosion and protection detection system in the test device and method based on the real working conditions of the boiler on-site pipeline service in the present invention.

In the figure: 1. pipeline; 2. welding port; 3. valve; 4. left valve switch wrench; 5. pipe test piece; Elbow; 10, right valve switch wrench; 11, switch wrench fixing screw; 12, camera.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but those skilled in the art will understand that the embodiments described below are some of the embodiments of the present invention, rather than all of them. It is only used to illustrate the present invention and should not be construed as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention. Those who do not indicate the specific conditions in the examples are carried out according to the conventional conditions or the conditions suggested by the manufacturer. The reagents or instruments used were not indicated by the manufacturer, and they were all conventional products that could be purchased from the market.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

Embodiment one:

As shown in Figures 1 and 2, a test device based on the real working conditions of the pipeline on the boiler site includes a pipeline 1, a welding port 2, a valve 3, a left valve switch wrench 4, a pipeline test piece 5, left and right pipe butt joints 6, Ambient temperature measuring instrument 7, fixing nut 8, elbow 9, right valve switch wrench 10, switch wrench fixing screw 11 and camera 12, the pipe test piece 5 is located at the two ends of the left and right pipe butt joints 6, the camera 12 and the ambient temperature measurement The instrument 7 is installed on the left and right pipe butt joints 6, the two ends of the pipe test piece 5 are installed with fixing nuts 8, the two ends of the pipe test piece 5 are respectively connected with valves 3, and the left valve switch wrench is respectively installed on the valves 3 4. Right valve switch wrench 10, elbow 9, switch wrench fixing screw 11, welding port 2 and pipe 1.

Further, the left and right pipe butt joints 6 are positioned and connected to the pipe test piece 5, the left and right pipe butt joints 6 are positioned and installed between the camera 12 and the ambient temperature measuring instrument 7, and the ends of the left and right pipe butt joints 6 pass through the pipe test piece. Part 5, fixed nut 8 are connected with the position of valve 3.

Further, the valve 3 is installed between the left valve switch wrench 4 and the right valve switch wrench 10, and the left valve switch wrench 4 and the right valve switch wrench 10 respectively control the positions of the two groups of valves 3, and the valve 3 passes through the welding port. 2 is connected to pipe 1.

Further, the pipeline test piece 5 is a detachable structure, and the position of the valve 3 is closed when the pipeline test piece 5 is disassembled, and the normal working medium flow of the main pipeline is not affected during the pipeline test piece 5 disassembly process.

Further, a detection platform is set on the transition connector shell of the pipeline test piece 5, and a temperature sensor and a corrosion form monitor on the outer wall of the pipe are installed on the detection platform.

Embodiment two:

On the basis of Example 1, as shown in Figures 1 and 2, a test method based on the actual working conditions of the pipeline on the boiler site, including a pipeline 1, a welding port 2, a valve 3, a left valve switch wrench 4, and a pipeline test piece 5. Left and right pipe butt joint 6, ambient temperature measuring instrument 7, fixed nut 8, elbow 9, right valve switch wrench 10, switch wrench fixing screw 11 and camera 12, pipe test piece 5 is located at both ends of left and right pipe butt joint 6 Position, the camera 12 and the ambient temperature measuring instrument 7 are installed on the left and right pipe butt joints 6, the two ends of the pipe test piece 5 are equipped with fixing nuts 8, and the two ends of the pipe test piece 5 are respectively connected to the valve 3, the valve 3 The left valve switch wrench 4, the right valve switch wrench 10, the elbow 9, the switch wrench fixing screw 11, the welding port 2 and the pipeline 1 are respectively installed on the top, including the following steps:

S1: Liquid/gas transmission control: Drill two holes at a distance from each other on the water wall or superheater pipe, weld two sections of pipes in the vertical direction of the holes, and connect the other end of the pipe to the valve through threads. Close the valve before the fitting, disconnect the liquid/gas phase of the boiler tube, and then open it after the corrosion test starts. The liquid/gas flowing out of the pipeline enters the bypass test system after passing through the valve;

S2: Tubular test piece installation: The internal tubular test piece of the bypass test system is divided into left and right sections for corrosion comparison test. Both ends of each tubular test piece are processed with threads, one end is fixedly connected to the elbow, and the other end is connected to the transition connection device;

S3: Transition connector installation: Due to the needs of corrosion test detection, the tubular test piece is equipped with a transition connector, and the transition connector of the test piece is equipped with elastic materials to ensure that the tubular test piece can be realized under the condition of the allowable centering error limit. Firmware connection;

S4: Pipeline real-time monitoring: Install an ambient temperature infrared tester on the upper end of the transition connector of the test piece, which mainly tests the instantaneous temperature of the boiler flue gas. There is a chip inside to store temperature data. On both sides of the tester, it can be connected according to requirements. Fix the miniature camera, aim the lens at the outer wall of the tubular test piece, observe the corrosion, dust accumulation, thickness change, etc. of the outer wall of the tube in real time, and store the image data in the chip;

S5: Data monitoring and transmission: Both chips have the function of remote data transmission. When the test piece is disassembled, the data chip with the flue gas temperature change history is taken out. After processing, it can be used for corrosion performance evaluation and corrosion mechanism research. During the working period of the boiler, the temperature data is remotely transmitted to the mobile phone of the scientific and technical personnel in real time for real-time monitoring, so as to achieve the purpose of the real working condition test of the boiler on-site pipeline service.

Furthermore, the test method for the real working conditions of the boiler on-site pipeline uses the pipeline bypass corrosion and protection detection system for corrosion tests, and the test piece is made into two sections that are exactly the same as the actual pipeline structure size.

Further, the test method for the real working conditions of the boiler on-site pipeline service includes determining the location of the corrosion test, performing pipeline bypass corrosion and protection detection operations, connecting the bypass system, and performing corrosion detection

Working principle: the present invention includes pipeline 1, welding port 2, valve 3, left valve switch wrench 4, pipeline test piece 5, left and right pipe butt joints 6, ambient temperature measuring instrument 7, fixed nut 8, elbow 9, right valve switch Wrench 10, switch wrench fixing screw 11, camera 12, determine the location of the corrosion test, the test device is installed on the most corrosive four tubes in the boiler, and the high temperature corrosion test should try to choose the high temperature area with serious corrosion in the boiler as the test point, if If it is a water wall, choose the upper part of the first and second flue; if it is a superheater or reheater, choose the third flue inlet where the high temperature superheater/reheater is usually located; if it is an economizer, choose the fourth or The location where the tail flue economizer is installed is mainly to detect low-temperature corrosion. In general, the disassembly and assembly of the test piece is arranged during the planned shutdown of the boiler for maintenance. The principle of designing the pipeline bypass corrosion and protection detection system is To ensure convenient disassembly and assembly, in principle, each disassembly or assembly should not exceed 30-60 minutes. The metal materials used in the pipeline bypass corrosion and protection detection system are all 310S or HT347H stainless steel. First of all, drill two holes on the water wall or superheater pipe with an interval of 800-1200mm, and weld two sections of pipes with a diameter of 20-30mm, a length of 200-400mm, and a wall thickness of 4-6mm in the vertical direction of the holes. The valve is connected by thread. The function of the valve is to close the valve to disconnect the liquid/gas of the boiler tube before disassembling and installing the test piece, and then open it after the bypass is restored. After the valve is opened, the liquid/gas flowing out of the pipe passes through the valve. , and then through 90° or a certain angle such as 60° and other elbows Φ20-30mm, unilateral length 200-300mm, wall thickness 4-6mm, both ends are threaded, and then enter the bypass test system, the bypass system consists of tubular test It is composed of test piece, test piece transition connector, left and right connecting nuts of test piece and temperature tester. Tubular test piece Φ20-30mm, length 150-250mm, wall thickness 4-6mm, both ends are threaded, both ends are processed with threads, one end is fixedly connected with the elbow thread through a nut, and the other end is connected with a transition connector through a thread. Due to the needs of corrosion test detection, the test piece should be disassembled and assembled frequently. Considering that the test piece may not be completely aligned with the left and right connecting pipes during the installation process of each test piece, a test piece transition connector, the so-called The transition connector of the test piece is equipped with circumferential elastic materials such as high temperature resistant carbon fiber fluororubber inside, which can realize reliable solid connection of the test piece under the condition of the allowable neutral error limit. In addition, there are high temperature resistant graphite sealing gaskets at all joints to prevent joint leakage and corrosion detection process. Install an infrared ambient temperature tester on the upper end of the transition connector of the test piece. It mainly tests the instantaneous temperature of the boiler flue gas. There is a chip to store data in it. When disassembling the test piece, take out the data chip that stores the flue gas temperature change history. After treatment, it can be used for corrosion performance evaluation and corrosion mechanism research. On both sides of the detector, a micro-camera can be bolted and fixed according to requirements, and the lens is aimed at the outer wall of the tubular test piece to observe the corrosion, dust accumulation, coking, etc. of the outer wall of the tube in real time. Set the shooting frequency according to the pre-established testing requirements. For example, take a photo of the outer wall of the tubular test piece every day. After a period of accumulation, the forming process of the tube wall dust accumulation or the thinning process of the tube wall can be recorded vividly. And the image is stored in the chip as a data file for calling during analysis. The tester is covered with a stainless steel cover with vents to prevent damage from high temperature radiation. Both chips have the function of transmitting data remotely. It can not only take out the data chip with flue gas temperature change history while dismantling the test piece, but after processing, it can be used for corrosion performance evaluation and corrosion mechanism research; it can also transmit data remotely in real time during boiler operation To the receiving end of the scientific and technical personnel, to achieve the purpose of monitoring, the two measurement systems are integrated on one generating board. The principle of remote data transmission of the thermometer is as follows: first, the temperature value is measured through the thermistor, and then the voltage change is transmitted to the single-chip microcomputer through the amplifier. At the receiving end in the technician's office, the final signal is demodulated and displayed. The principle of image signal transmission is similar.

It should be noted that in this article, relational terms such as first and second (number one, number two), etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between such entities or operations. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible, which fall within the scope of the claimed invention.

Claims (8)

1. The utility model provides a test device based on real operating mode of on-spot pipeline in service of boiler, includes pipeline (1), crater (2), valve (3), left valve switch spanner (4), pipeline test piece (5), controls pipe butt joint ware (6), ambient temperature measuring apparatu (7), fixation nut (8), elbow (9), right valve switch spanner (10), switch spanner fixed screw (11) and camera (12), its characterized in that: pipeline test piece (5) are located the both ends position of controlling pipe butt connector (6), install with ambient temperature measuring apparatu (7) about on pipe butt connector (6) camera (12), fixation nut (8) are installed to the both ends position of pipeline test piece (5), the both ends tip of pipeline test piece (5) is connected with valve (3) respectively, install left valve switch spanner (4), right valve switch spanner (10), elbow (9), switch spanner fixed screw (11), weld joint (2) and pipeline (1) on valve (3) respectively.

2. The testing device based on the real service working condition of the boiler field pipeline according to claim 1, characterized in that: the left and right pipe butt joint devices (6) are connected with the pipeline test piece (5) in a positioning mode, the left and right pipe butt joint devices (6) are installed with the camera (12) and the environment temperature measuring instrument (7) in a positioning mode, and the end portions of the two ends of the left and right pipe butt joint devices (6) are connected with the valve (3) in a positioning mode through the pipeline test piece (5) and the fixing nut (8).

3. The test device based on boiler field pipeline service real working condition of claim 1, characterized in that: install between valve (3) and left valve switch spanner (4), right valve switch spanner (10), and left valve switch spanner (4), right valve switch spanner (10) are controlled the position of two sets of valves (3) respectively, be connected between valve (3) through weld opening (2) and pipeline (1).

4. The testing device based on the real service working condition of the boiler field pipeline according to claim 1, characterized in that: the pipeline test piece (5) is of a detachable structure, the position of the valve (3) is closed when the pipeline test piece (5) is disassembled and assembled, and normal working medium flowing of the main pipeline is not influenced in the disassembling and assembling process of the pipeline test piece (5).

5. The test device based on boiler field pipeline service real working condition of claim 1, characterized in that: a detection platform is arranged on a transition connector shell of the pipeline test piece (5), and a temperature sensor and a pipe outer wall corrosion form monitor are mounted on the detection platform.

6. A test method based on real working conditions of boiler field pipeline service is characterized in that: the method comprises the following operation steps:

s1: liquid/gas transport control: drilling two holes on a water wall or a superheater pipeline at a certain distance, respectively welding two sections of pipelines in the vertical direction of an orifice or at a certain angle of 60 degrees, and the like, wherein the other end of the pipeline is connected with a valve through a thread, the valve is closed before a test piece is disassembled and assembled, the liquid/gas phase of a boiler pipe is disconnected, the boiler pipe is opened after a corrosion test is started, and the liquid/gas flowing out of the pipeline enters a bypass test system after passing through the valve;

s2: mounting a tubular test piece: the method comprises the following steps that a tubular test piece in a bypass test system is divided into a left section and a right section, a corrosion comparison test is carried out, threads are machined at two ends of each tubular test piece, one end of each tubular test piece is fixedly connected with an elbow, and the other end of each tubular test piece is connected with a transition connector;

s3: installation of a transition connector: as the tubular test piece is provided with the transition connector according to the requirement of corrosion test detection, the transition connector of the test piece is internally provided with an elastic object, so that the tubular test piece can be fixedly connected under the condition of allowable centering error limitation;

s4: real-time monitoring of pipelines: an environment temperature infrared tester is arranged at the upper end of a test piece transition connector and mainly used for testing the instantaneous temperature of boiler flue gas, a chip is arranged in the test piece transition connector and used for storing temperature data, miniature cameras can be connected and fixed on vertical surfaces of two sides of the tester according to requirements, a lens is aligned to the outer wall of a tubular test piece, the conditions of corrosion, dust deposition, thickness change and the like of the outer wall of the tube are observed in real time, and image data are stored in the chip;

s5: data monitoring and transmission: two chips all have the function of teletransmission data, when dismantling the test piece, will have the data chip that has flue gas temperature change process and take out, can supply corrosion behavior aassessment and corrosion mechanism to study after handling to use, during boiler work, in real time with temperature data teletransmission to scientific and technological personnel's cell-phone, carry out real time monitoring, reach the actual operating mode experimental purpose of being on active service of boiler site pipeline.

7. The test method based on the service real working condition of the boiler field pipeline as claimed in claim 6, wherein: the test method of the boiler on-site pipeline service real working condition adopts a pipeline bypass corrosion and protection detection system to carry out corrosion test, and a test piece is made into two sections with the same structure size as an actual pipeline.

8. The test method based on the service real working condition of the boiler field pipeline as claimed in claim 6, wherein: the test method of the boiler on-site pipeline service real working condition comprises the steps of determining a corrosion test position, carrying out pipeline bypass corrosion and protection detection operation, connecting a bypass system and carrying out corrosion detection.

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