One-dimensional furnace testing system and testing method for on-line determination of high-temperature corrosion rate

Abstract

The invention discloses a one-dimensional furnace test system and test method for on-line determination of a high-temperature corrosion rate. The test system comprises a one-dimensional furnace body, and a plurality of heating assemblies are arranged in the one-dimensional furnace body; a furnace chamber is arranged in the one-dimensional furnace body, and a test sample piece is arranged in the furnace chamber; a gas transmission assembly is connected to a furnace cavity of the one-dimensional furnace body, and the other end of the gas transmission assembly communicates with a hearth of the boiler. The second temperature measuring assembly is located in a hearth of the boiler; and the control unit communicates with the second temperature measurement assembly and the gas transmission assembly. The test system is simple in structure and reasonable in design, effectively realizes online measurement of the high-temperature corrosion rate of the water-cooled pipe in an actual environment, and is accurate in test result and high in reliability.

Description

Technical Field

[0001] The invention belongs to the technical field of safe operation of power station boilers and relates to a one-dimensional furnace testing system and a testing method for online determination of high-temperature corrosion rate. Background Art

[0002] In laboratory environments, one-dimensional furnaces are often used to measure the corrosion composition and thinning rate of metal specimens in high-temperature environments. This method is widely recognized for its high accuracy. However, despite its high accuracy, this method still faces many challenges in practical applications. Among them, the most critical problem is that the flue gas composition and temperature conditions provided by the one-dimensional furnace cannot fully simulate and represent the complex working conditions of the boiler water-cooled wall in the actual service environment. The surface temperature of the specimens in the laboratory also cannot accurately reflect the actual temperature distribution of the water-cooled wall tubes inside the boiler, which leads to the limitations of the one-dimensional furnace test results. Specifically, these test results are difficult to fully and accurately represent the high-temperature corrosion risks faced by different positions in the actual operation of the boiler, and cannot effectively predict and guide the changing trend of the high-temperature corrosion rate of the water-cooled wall under variable working conditions. In addition, the measurement of high-temperature corrosion thinning is usually carried out during the maintenance period of the boiler, and such measurements cannot be carried out during the normal operation of the boiler. Since the maintenance period is often short and there is a large uncertainty, the measurement of high-temperature corrosion thinning may not be carried out in time. Once the measurement is not timely, excessive thinning caused by corrosion and insufficient pressure bearing capacity may cause safety hazards such as leakage. What is more serious is that during the operation of the boiler, if there is a change in the type of coal (such as switching to high-sulfur coal) or equipment degradation (such as air preheater blockage leading to insufficient output of the induced draft fan and reduced oxygen in the main combustion zone), the impact of these changes on the high-temperature corrosion thinning rate cannot be reflected in time in the offline measurement during the maintenance period. This means that the traditional offline high-temperature corrosion measurement method during the maintenance period has obvious lag in responding to changes in boiler operating conditions, making it difficult to achieve abnormal warning and feedback adjustment of operating modes.

[0003] In order to make up for this deficiency, the near-wall atmosphere measurement technology came into being. This technology can measure the CO and H near the water-cooled wall area online. 2 The content of key atmosphere components such as S provides a new perspective for evaluating high-temperature corrosion conditions. However, the near-wall atmosphere measurement is still an indirect measurement method. Although there is a certain correlation between it and the high-temperature corrosion thinning rate, it cannot directly and quantitatively obtain the corrosion thinning rate of the pipe, and the reliability of the test results is poor. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a one-dimensional furnace testing system and testing method for online determination of high-temperature corrosion rate, thereby solving the technical problems in the prior art that the corrosion and thinning rate of the pipe in operation cannot be directly obtained online and the reliability of the test results is poor.

[0005] The present invention is achieved through the following technical solutions: A one-dimensional furnace test system for online determination of high temperature corrosion rate, comprising: A one-dimensional furnace body, wherein a plurality of heating components are arranged in the one-dimensional furnace body; A furnace cavity is provided inside the one-dimensional furnace body, and a test sample is provided in the furnace cavity; A gas transmission component is connected to the furnace cavity of the one-dimensional furnace body, and the other end of the gas transmission component is connected to the furnace of the boiler; A second temperature measuring component, wherein the second temperature measuring component is located inside the furnace of the boiler; And a control unit, wherein the control unit communicates with both the second temperature measurement component and the gas transmission component.

[0006] Preferably, the gas transmission component comprises a gas transmission pump, the gas inlet of the gas transmission pump is connected to an air inlet pipe, and the gas outlet is connected to an air outlet pipe; The free end of the air inlet pipe is connected to the furnace of the boiler, and the free end of the air outlet pipe is connected to the furnace cavity of the one-dimensional furnace body; the gas transmission pump communicates with the control unit.

[0007] Preferably, the depth of the air inlet pipe extending into the boiler furnace is greater than 1 mm and less than half of the diameter of the water-cooled wall tube.

[0008] Preferably, a first flow regulating component is provided on the air outlet pipe.

[0009] Preferably, a sealing assembly is provided at the connection between the air inlet pipe and the boiler and at the connection between the air outlet pipe and the one-dimensional furnace body.

[0010] Preferably, a plurality of the heating components are evenly distributed inside the one-dimensional furnace body.

[0011] Preferably, the test sample is a test sample tube or a test sample sheet.

[0012] Preferably, when the test sample is a test sample tube, the outer wall of the test sample tube is provided with a first temperature measuring component and a first gas component detection component, and the first temperature measuring component and the first gas component detection component are both in communication with the control unit; The two ends of the test sample tube are respectively connected to a first water cooling tube and a second water cooling tube, and the free ends of the first water cooling tube and the second water cooling tube are provided with water cooling components.

[0013] Preferably, the test system further comprises a second gas component detection component, which is arranged inside the furnace of the boiler; the second temperature measurement component and the second gas component detection component are arranged close to the air inlet of the air inlet pipe.

[0014] A one-dimensional furnace test method for online determination of high temperature corrosion rate is performed using the above test system and includes the following steps: The temperature difference threshold is set, and the control unit obtains the temperature inside the boiler furnace cavity through the second temperature measuring component; The gas inside the furnace cavity of the boiler is pumped into the furnace cavity of the one-dimensional furnace body through the gas transmission component, so that the atmosphere composition inside the furnace cavity of the one-dimensional furnace body is consistent with the gas composition inside the furnace cavity of the boiler, and the absolute value of the temperature difference between the temperature inside the furnace cavity of the one-dimensional furnace body and the temperature inside the furnace cavity of the boiler is less than the temperature difference threshold value through the heating component; Then, an online high temperature corrosion rate test is performed on the test sample tube.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: The invention discloses a one-dimensional furnace testing system for online determination of high-temperature corrosion rate. By arranging a first temperature measuring component and a first gas component detection component on a test sample tube and combining with a control unit, the internal temperature of a furnace cavity of a one-dimensional furnace body where the test sample tube is located and the gas composition are effectively acquired quickly. Then, by arranging a second temperature measuring component and a second gas component detection component in the furnace cavity of the boiler, the internal temperature and gas composition of the boiler are effectively acquired quickly. Then, by controlling the gas transmission component, the gas in the boiler is transmitted to the furnace cavity of the one-dimensional furnace body, and the gas composition in the furnace cavity of the one-dimensional furnace body is kept consistent with the gas composition in the boiler. At the same time, the temperature in the furnace cavity of the one-dimensional furnace body is controlled to be consistent with the temperature in the boiler through a heating component and a water-cooling component, which can effectively reproduce the internal environment of the boiler, keep the test sample tube consistent with the environment of an actual water-cooling tube, and realize the online high-temperature corrosion rate determination of the water-cooling tube. The testing system has a simple structure and a reasonable design, and effectively realizes the online determination of the high-temperature corrosion rate of the water-cooling tube in the actual environment. The test result is accurate and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0017] Figure 1It is a structural schematic diagram of a one-dimensional furnace test system for online determination of high-temperature corrosion rate when the test sample in the present invention is a test sample; Figure 2 The present invention is a schematic structural diagram of a one-dimensional furnace testing system for online determination of high-temperature corrosion rate when the test sample is a test sample tube.

[0018] Wherein: 1. one-dimensional furnace body, 2. heating component, 3. furnace cavity, 4. test sample tube, 5. control unit, 6. first temperature measurement component, 7. first gas component detection component, 8. water cooling component, 9. gas transmission component, 10. second temperature measurement component, 11. second gas component detection component, 12. boiler, 13. test sample, 91. gas transmission pump, 92. air inlet pipe, 93. air outlet pipe, 41. first water cooling pipe, 42. second water cooling pipe, 43. second flow regulating component. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0022] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0023] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings: Example 1 like Figure 1 As shown, the present invention discloses a one-dimensional furnace testing system for online determination of high-temperature corrosion rate, comprising: a one-dimensional furnace body 1, wherein a plurality of heating components 2 are arranged in the one-dimensional furnace body 1; a furnace cavity 3 is arranged inside the one-dimensional furnace body 1, wherein a test sample is arranged in the furnace cavity 3; a gas transmission component 9 is connected to the furnace cavity 3 of the one-dimensional furnace body 1, and the other end of the gas transmission component 9 is connected to the furnace of a boiler 12; a second temperature measuring component 10, wherein the second temperature measuring component 10 is located inside the furnace of the boiler 12; and a control unit 5, wherein the control unit 5 communicates with both the second temperature measuring component 10 and the gas transmission component 9.

[0026] In the above system, the one-dimensional furnace body 1 serves as the main structure of the test system and provides a controllable high-temperature environment. Several heating components 2 are provided inside to heat the furnace chamber 3 to reach the required test temperature. The furnace chamber 3 is used to accommodate the test samples and provide a closed high-temperature test environment. It needs to be able to withstand high temperatures and maintain a certain airtightness to ensure the accuracy of the test results. The test sample is used to replace the actual water-cooling pipe to evaluate its corrosion rate in a high-temperature environment. Its material, shape and size should be designed according to the test requirements. The gas transmission component 9 is used to introduce the gas in the furnace chamber of the boiler 12 into the furnace chamber 3 of the one-dimensional furnace body 1. One end is connected to the furnace chamber 3 of the one-dimensional furnace body 1, and the other end is connected to the furnace of the boiler 12 to achieve the reproduction of the gas environment in the furnace chamber of the boiler 12. The second temperature measurement component 12 is installed in the boiler furnace chamber to monitor the temperature in the boiler furnace chamber. The control unit 5 serves as the control center of the entire test system, which is responsible for receiving and processing the data of each component, and controlling the working state of the heating component 2 and the gas transmission component 9. The one-dimensional furnace test system for online determination of high-temperature corrosion rate integrates a variety of high-precision sensors and intelligent control components. It can monitor and analyze material corrosion in real time under high-temperature environments, providing strong technical support for research in the fields of materials science and engineering.

[0027] The further preferred gas transmission component 9 includes a gas transmission pump 91, the air inlet of the gas transmission pump 91 is connected to an air inlet pipe 92, the air outlet is connected to an air outlet pipe 93, the free end of the air inlet pipe 92 is connected to the furnace of the boiler 12, and the free end of the air outlet pipe 93 is connected to the furnace chamber 3 of the one-dimensional furnace body 1; the gas transmission pump 91 communicates with the control unit 5. As the core component of the gas circulation, the gas transmission pump 91 is responsible for extracting the gas in the furnace chamber of the boiler 12 and sending it into the furnace chamber 3 of the one-dimensional furnace body 1 through the air outlet pipe 93. The air inlet pipe 92 and the air outlet pipe 93 are respectively connected to the air inlet and the air outlet of the gas transmission pump 91 to form a gas circulation channel, the free end of the air inlet pipe 92 is connected to the furnace of the boiler 12, and the free end of the air outlet pipe 93 is connected to the furnace chamber 3 of the one-dimensional furnace body 1. The control unit 5 communicates with the gas transmission pump 91, and can monitor and control the working state of the gas transmission pump 91 in real time to ensure the stable circulation of the gas.

[0028] In a more preferred embodiment, the air inlet pipe 92 is vertically inserted into the fins between the water-cooled wall tubes of the boiler water-cooled wall, and extends into the boiler, with a depth greater than 1 mm and less than half the diameter of the water-cooled wall tube. The air inlet pipe 92 can also be a sampling tube, and its diameter is greater than 4 mm and less than the fin width, and more preferably, 2 mm less than the fin width.

[0029] In addition, in order to adjust the gas flow entering the furnace chamber 3 of the one-dimensional furnace body 1 and ensure that the gas conditions during the test are stable and controllable, a first flow regulating component is provided on the gas outlet pipe 93. At the same time, the connection between the gas inlet pipe 92 and the boiler 12 and the connection between the gas outlet pipe 93 and the one-dimensional furnace body 1 are both provided with sealing components to ensure the sealing of the gas circulation channel and prevent gas leakage.

[0030] In a preferred embodiment, the test sample is a test sample tube 4 or a test sample sheet 13. Figure 2 As shown, when the test sample is a test sample tube 4, the outer wall of the test sample tube 4 is provided with a first temperature measuring component 6 and a first gas component detection component 7, and the first temperature measuring component 6 and the first gas component detection component 7 are both in communication with the control unit 5; the two ends of the test sample tube 4 are respectively connected with a first water cooling tube 41 and a second water cooling tube 42, and the free ends of the first water cooling tube 41 and the second water cooling tube 42 are provided with a water cooling component 8. The first temperature measuring component 6 is used to monitor the temperature outside the test sample tube 4 in real time to ensure the temperature control accuracy during the test process, and is installed on the outer wall of the test sample tube 4. The first gas component detection component 7 is used to analyze the components of the gas in the furnace chamber 3 to understand the atmospheric conditions in the test environment, and is also installed on or near the outer wall of the test sample tube 4. The water cooling component 8 is used to cool the test sample tube 4 to prevent the sample tube from being damaged due to long-term high temperature exposure, and also helps to maintain the temperature gradient of the test sample tube 4, and is connected to the test sample tube 4 to ensure effective heat exchange.

[0031] In order to adjust the flow of cooling water to ensure that the cooling effect of the test sample tube 4 is stable and controllable, a second flow regulating component 43 is provided on the first water cooling tube 41; and the second flow regulating component 43 communicates with the control unit 5. The control unit 5 can monitor and control the flow of cooling water in real time to ensure that the temperature of the test sample tube 4 is stable during the test process.

[0032] The above-mentioned heating components can be heating wires, heating belts or heaters, etc. The specific selection depends on the design of the one-dimensional furnace body and the heating requirements. As a high-temperature test environment, the furnace cavity is usually made of high-temperature resistant materials, such as ceramics, quartz or stainless steel. The first temperature measuring component and the second temperature measuring component can use high-temperature thermocouples, high-temperature thermal resistors or infrared thermometers to monitor the temperature of the furnace cavity and the test sample tube in real time. The gas transmission component can use high-temperature gas pipelines, valves and flow meters to realize the circulation and exchange of gases. The control unit includes a data acquisition module, a control module and a display module, etc., which are used to receive and process the data of each component and control the working status of each component.

[0033] In addition, preferably, the test system further includes a second gas component detection component 11, which is arranged inside the furnace of the boiler 12; the second temperature measurement component 10 and the second gas component detection component 11 are arranged near the air inlet of the air inlet pipe 92. The second gas component detection component 11 is installed in the boiler furnace cavity, and is used to monitor the temperature and gas components in the boiler furnace cavity, and is used to monitor the environment in the boiler furnace cavity in real time, and keep the environment in the furnace cavity 3 of the one-dimensional furnace body 1 consistent with the environment in the boiler furnace cavity.

[0034] In a preferred arrangement, the second temperature measuring component 10 and the second gas component detection component 11 are arranged close to the air inlet of the air inlet pipe 92, so that the test site is consistent with the position where the gas is obtained, and the accuracy of the test result is higher.

[0035] In addition, a plurality of the heating components 2 are evenly distributed inside the one-dimensional furnace body 1 to ensure even temperature distribution in the furnace cavity 3 and improve the accuracy of the test.

[0036] Example 2 In addition, based on the above-mentioned test system, the present invention also discloses a one-dimensional furnace test method for online determination of high temperature corrosion rate, comprising the following steps: The temperature difference threshold is set, and the control unit 5 obtains the temperature inside the furnace cavity of the boiler 12 through the second temperature measuring component 10; The gas inside the furnace cavity of the boiler 12 is pumped into the furnace cavity 3 of the one-dimensional furnace body 1 through the gas transmission component 9, so that the atmosphere composition inside the furnace cavity 3 of the one-dimensional furnace body 1 is consistent with the gas composition inside the furnace cavity of the boiler 12, and the absolute value of the temperature difference between the temperature inside the furnace cavity 3 of the one-dimensional furnace body 1 and the temperature inside the furnace cavity of the boiler 12 is less than the temperature difference threshold value through the heating component 2; Then, an online high temperature corrosion rate test is performed on the test sample tube 4 .

[0037] For the above-mentioned one-dimensional furnace test method for online determination of high-temperature corrosion rate, specifically, the control unit 5 is activated and the test process is started. The second temperature measuring component 10 measures the temperature inside the furnace cavity of the boiler 12 and transmits the data to the control unit 5 in real time. The gas transmission component 9 is started, and the gas transmission pump 91 extracts gas from the furnace cavity of the boiler 12 through the air inlet pipe 92. The extracted gas is transmitted to the furnace cavity 3 of the one-dimensional furnace body 1 through the air outlet pipe 93. The control unit 5 adjusts the working state of the heating component 2 inside the one-dimensional furnace body 1 according to the data of the first temperature measuring component 6, so that the absolute value of the temperature difference between the temperature inside the furnace cavity 3 of the one-dimensional furnace body 1 and the temperature inside the furnace cavity of the boiler 12 is less than the temperature difference threshold, so as to ensure that the temperature inside the furnace cavity 3 of the one-dimensional furnace body 1 is consistent with the temperature inside the furnace cavity of the boiler 12, and the boiler environment is reproduced. After the atmosphere and temperature are synchronized, the control unit 5 confirms that the test conditions have been met and is ready to perform an online high-temperature corrosion rate test. Key data in the corrosion process such as temperature, atmosphere composition, corrosion rate, etc. are recorded in real time and stored in the control unit 5. After a certain test cycle, the test sample tube 4 is taken out, and the corrosion thinning amount is measured by multiple methods such as multi-point thickness measurement, weighing, and electron microscopy, and the corrosion thinning rate is calculated according to the test duration. After establishing a test account, the corrosion thinning rate of the pipe associated with the operating conditions such as coal quality and oxygen content in the main combustion zone can be obtained. This device can obtain the high-temperature corrosion thinning rate of the water-cooled wall pipe during operation, reduce the risk of thinning and leakage of the pipe caused by high-temperature corrosion, reduce the workload of setting up scaffolding to measure the high-temperature corrosion thinning rate during maintenance, reduce the cost of water-cooled wall overhaul and maintenance, and improve the operating efficiency and safety of the pulverized coal boiler.

[0038] Specifically, when the test sample is a test sample tube 4, the above-mentioned one-dimensional furnace test method for online determination of high-temperature corrosion rate is that the control unit 5 is activated and the test process is started. The first temperature measurement component 6 measures the temperature inside the furnace cavity 3 of the one-dimensional furnace body 1, and transmits the data to the control unit 5 in real time. The first gas component detection component 7 simultaneously analyzes the gas composition inside the furnace cavity 3, and also transmits the data to the control unit 5 in real time. The second temperature measurement component 10 measures the temperature inside the furnace cavity of the boiler 12, and transmits the data to the control unit 5 in real time. The second gas component detection component 11 analyzes the gas composition inside the furnace cavity of the boiler, and also transmits the data to the control unit 5 in real time. The control unit 5 starts the gas transmission component 9 according to the gas composition data in the furnace cavity of the boiler 12. The gas transmission pump 91 extracts gas from the furnace cavity of the boiler 12 through the air inlet pipe 92. The extracted gas is transmitted to the furnace cavity 3 of the one-dimensional furnace body 1 through the air outlet pipe 93. The control unit 5 adjusts the working state of the gas transmission component 9 according to the data of the first gas component detection component 7 and the second gas component detection component 11 until the atmosphere composition inside the furnace cavity 3 of the one-dimensional furnace body 1 is consistent with the gas composition inside the furnace cavity of the boiler 12. The control unit 5 adjusts the working state of the heating component 2 inside the one-dimensional furnace body 1 according to the data of the first temperature measurement component 6 and the second temperature measurement component 10. At the same time, the control unit 5 adjusts the cooling effect of the test sample tube 4 and its surrounding environment through the water cooling component 8 as needed to ensure that the temperature inside the furnace cavity 3 of the one-dimensional furnace body 1 is consistent with the temperature inside the furnace cavity of the boiler 12, so as to achieve the reproduction of the boiler environment. After the atmosphere and temperature are synchronized, the control unit 5 confirms that the test conditions have been met and is ready to perform an online high-temperature corrosion rate test. Key data in the corrosion process such as temperature, atmosphere composition, corrosion rate, etc. are recorded in real time and stored in the control unit 5. After a certain period of testing, after taking out the test sample tube 4, the corrosion thinning amount is measured by multiple methods such as multi-point thickness measurement, weighing, and electron microscopy, and the corrosion thinning rate is calculated according to the test duration.

[0039] For the above test method, when the test sample is the test sample 13, the absolute value of the temperature difference between the temperature inside the furnace cavity 3 of the one-dimensional furnace body 1 and the temperature at the air inlet of the air inlet pipe 92 is controlled to be less than the set temperature difference threshold, which can be 50°C.

[0040] When the test sample is the test sample tube 4, the absolute value of the temperature difference between the temperature of the outer wall of the test sample tube 4 and the temperature at the air inlet of the air inlet pipe 92 is controlled to be smaller than a set temperature difference threshold, which may be 20°C.

[0041] like Figure 1 , which is a schematic diagram of a preferred test system result when the test sample is a metal sample 13.

[0042] Example 3 A 1000MW supercritical counter-fired boiler has three layers of burners. The side wall of the burner area is an area with a high high-temperature corrosion rate. The spacing between the water-cooled wall fins is 10mm, and the outer diameter of the water-cooled wall tube is 63mm. A one-dimensional furnace test system for online high-temperature corrosion rate measurement is arranged at the center of the side wall 0.5m above each layer of burners on the left and right walls. The end of the air inlet pipe 92 extends into the furnace to a depth of 2mm. Adjust the electric power to ensure that the heating component 2 makes the deviation between the flue gas temperature in the furnace cavity 3 of the one-dimensional furnace body 1 and the flue gas temperature at the air inlet of the air inlet pipe 92 less than 10°C; adjust the flow of the water-cooled component 8 so that the temperature difference between the tube wall temperature of the test sample tube 4 and the metal wall of the adjacent water-cooled wall tube in the boiler is less than 10°C. Maintain this condition to measure the high-temperature corrosion rate, replace the sample every week, measure the corrosion thinning amount of the removed sample, and calculate the corrosion thinning rate.

[0043] Example 4 A 3000MW subcritical four-corner tangential combustion boiler has a total of 6 layers of burners. The four walls of the burner area may be areas with high high-temperature corrosion rates. The spacing between the water-cooled wall fins is 10mm, and the outer diameter of the water-cooled wall tube is 63mm. A set of high-temperature corrosion rate measurement test system is arranged at 0.5m above the 5th and 6th burners, at the center height of the SOFA burner and the 6th burner, downstream of the jet, that is, at the 3 / 4 position of the wall. The first temperature measurement component 6 and the first gas component detection component 7 are not arranged in the furnace. Only 3×3×1mm metal sample 13 is arranged in the one-dimensional furnace, and no water cooling component 8 is arranged. The depth of the air inlet of the air inlet pipe 92 extending into the four-corner tangential combustion boiler is 3mm. The electric power is adjusted to ensure that the temperature difference between the temperature in the furnace cavity 3 of the one-dimensional furnace body 1 and the metal wall temperature of the adjacent water-cooled wall tube in the four-corner tangential combustion boiler is less than 20℃. Maintain this condition to measure the high-temperature corrosion rate. Replace the sample every week and measure the corrosion thinning of the removed sample, and calculate the corrosion thinning rate. Take the high-sulfur coal blending test as an example, keep the sulfur content of the coal entering the furnace unchanged for 24 hours during the test. 2.5% sulfur coal is blended for 72 hours continuously, and one sample is replaced every 24 hours; 1% sulfur coal is blended for 72 hours continuously, and one sample is replaced every 24 hours. After measuring the corrosion thinning of the sample, the high-temperature corrosion thinning rate of each coal type can be calculated.

[0044] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A one-dimensional furnace test system for online determination of high temperature corrosion rate, characterized in that: include: A one-dimensional furnace body (1), wherein a plurality of heating components (2) are arranged in the one-dimensional furnace body (1); A furnace cavity (3) is provided inside the one-dimensional furnace body (1), and a test sample is provided inside the furnace cavity (3); A gas transmission component (9) is connected to the furnace chamber (3) of the one-dimensional furnace body (1), and the other end of the gas transmission component (9) is connected to the furnace of the boiler (12); A second temperature measuring component (10), the second temperature measuring component (10) being located inside a furnace of the boiler (12); and a control unit (5), wherein the control unit (5) communicates with both the second temperature measurement component (10) and the gas transmission component (9).

2. A one-dimensional furnace testing system for online determination of high temperature corrosion rate according to claim 1, characterized in that: The gas transmission component (9) comprises a gas transmission pump (91), the gas inlet of the gas transmission pump (91) is connected to an inlet pipe (92), and the gas outlet is connected to an outlet pipe (93); The free end of the air inlet pipe (92) is connected to the furnace of the boiler (12), and the free end of the air outlet pipe (93) is connected to the furnace chamber (3) of the one-dimensional furnace body (1); the gas transmission pump (91) communicates with the control unit (5).

3. A one-dimensional furnace testing system for online determination of high temperature corrosion rate according to claim 2, characterized in that: The air inlet pipe (92) extends into the furnace of the boiler (12) to a depth greater than 1 mm and less than half the diameter of the water-cooled wall tube.

4. A one-dimensional furnace testing system for online determination of high temperature corrosion rate according to claim 2, characterized in that: The air outlet pipe (93) is provided with a first flow regulating component.

5. The one-dimensional furnace testing system for online determination of high temperature corrosion rate according to claim 2, characterized in that: The connection between the air inlet pipe (92) and the boiler (12) and the connection between the air outlet pipe (93) and the one-dimensional furnace body (1) are both provided with sealing components.

6. The one-dimensional furnace testing system for online determination of high temperature corrosion rate according to claim 1, characterized in that: The plurality of heating components (2) are evenly distributed inside the one-dimensional furnace body (1).

7. The one-dimensional furnace testing system for online determination of high temperature corrosion rate according to claim 1, characterized in that: The test sample is a test sample tube (4) or a test sample sheet (13).

8. A one-dimensional furnace testing system for online determination of high temperature corrosion rate according to claim 7, characterized in that: When the test sample is a test sample tube (4), the outer wall of the test sample tube (4) is provided with a first temperature measurement component (6) and a first gas component detection component (7), and the first temperature measurement component (6) and the first gas component detection component (7) are both in communication with the control unit (5); The two ends of the test sample tube (4) are respectively connected to a first water cooling tube (41) and a second water cooling tube (42), and the free ends of the first water cooling tube (41) and the second water cooling tube (42) are provided with water cooling components (8).

9. The one-dimensional furnace testing system for online determination of high temperature corrosion rate according to claim 7, characterized in that: The test system further comprises a second gas component detection component (11), wherein the second gas component detection component (11) is arranged inside the furnace of the boiler (12); the second temperature measurement component (10) and the second gas component detection component (11) are arranged close to the air inlet of the air inlet pipe (92).

10. A one-dimensional furnace test method for online determination of high temperature corrosion rate, characterized in that: The test system according to any one of claims 1 to 8 is used, and comprises the following steps: A temperature difference threshold is set, and the control unit (5) obtains the temperature inside the furnace cavity of the boiler (12) through the second temperature measuring component (10); The gas inside the furnace chamber of the boiler (12) is pumped into the furnace chamber (3) of the one-dimensional furnace body (1) by means of a gas transmission component (9), so that the atmosphere composition inside the furnace chamber (3) of the one-dimensional furnace body (1) is consistent with the gas composition inside the furnace chamber of the boiler (12), and the absolute value of the temperature difference between the temperature inside the furnace chamber (3) of the one-dimensional furnace body (1) and the temperature inside the furnace chamber of the boiler (12) is less than the temperature difference threshold value by means of a heating component (2); Then, an online high-temperature corrosion rate test is performed on the test sample tube (4).

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