CN216978771U - An in-situ test system for anti-erosion-corrosion of boiler heating surface - Google Patents

Abstract

The utility model provides an erosion-corrosion resistance in-situ test system for a heating surface of a boiler, belonging to the field of test equipment, and the system comprises a combustion simulation device and an erosion-corrosion test device, wherein: the combustion simulation device comprises a feeding unit, a combustor and a combustion chamber which are sequentially connected from top to bottom; meanwhile, a combustion area electric heater and a sample area electric heater are arranged outside the combustion chamber; the erosion-corrosion device comprises an ash corrosion platform, a circulating water temperature control unit and a camera, wherein the ash corrosion platform extends into the combustion chamber; the circulating water temperature control unit is connected with the ash corrosion platform; the camera is arranged on the outer side of the combustion chamber visual window. The utility model can simulate the whole process of fuel ignition, combustion, fly ash impact, fly ash deposition and adhesion and corrosion reaction in the minimum space, realize the rapid evaluation of the erosion-corrosion resistance of the material under the complex coupling corrosion condition, and provide guidance for the optimization of corrosion-resistant materials at different parts in the boiler.

Description

An in-situ test system for the erosion-corrosion resistance of the heating surface of the boiler

technical field

The utility model belongs to the field of test equipment, and more particularly relates to an erosion-corrosion in-situ test system for a heating surface of a boiler.

Background technique

Combustion of solid fuels is the main way of thermal power generation. Fuel types include solid combustible substances that can generate heat or power, such as coal, biomass and solid waste. With the continuous growth of my country's energy demand, high-sodium coal in Xinjiang, high-sulfur coal in southwest China, biomass and solid waste are also more widely used for combustion power generation. However, due to the different contents of sodium, potassium, sulfur, and chlorine in these fuels, erosion-corrosion problems occur on the heat exchange surface of the boiler during the combustion process. Erosion refers to the process in which hard particles with a certain velocity come into contact with the surface of the material and produce an impact that causes the material to be lost. High temperature corrosion mainly refers to the oxidative corrosion of metal materials under high temperature conditions, resulting in the loss of metal materials. A large number of fly ash particles generated during the combustion of the above solid fuels, some of which are carried by the high-temperature flue gas, scour the heat exchange tube bundles on the heating surface of the boiler at a large speed, resulting in continuous consumption of heat exchange tubes; the rest are in the vortex flow. , under the action of thermophoresis and inertial impact, it adheres and deposits on the surface of the heat exchange tube and forms a molten material at high temperature to corrode the heat exchange tube, which is called deposition phase corrosion. In addition, the flue gas generated by fuel combustion contains corrosive gases such as HCl and SO ₂ , which will also corrode the heat exchange pipes, which is called gas phase corrosion. It is worth noting that deposition phase corrosion and vapor phase corrosion coexist in the actual service environment of the furnace, resulting in gas-solid coupling corrosion. At the same time, the heating surface tube bundle is subjected to the erosion-corrosion coupling effect of fly ash and flue gas. The damage to the surface structure of the boiler heating surface tube bundle by erosion will aggravate the process of ash deposition and corrosion, and the effect of corrosion on the surface roughness of the tube bundle will also affect the fly ash. erosion process. The damage to the tube bundle caused by this coupling effect is more serious than that of single erosion or corrosion, which will cause problems such as "tube burst", which greatly affects the safety and economy of power production.

The application of coating technology or new materials on the surface of the boiler heat exchange tube will effectively improve the erosion-corrosion resistance of the heat exchange tube on the heating surface of the boiler, prolong the service life of the boiler, and have a very broad application prospect. In order to achieve the purpose of optimizing coatings and new materials, it is necessary to conduct erosion-corrosion performance tests on applied coatings and new materials. However, the performance testing cycle of testing materials in the field environment is long, the economic cost is high, and the practicability is poor, so it is very important to realize the rapid and accurate evaluation of material performance in the laboratory. As mentioned above, in the actual furnace, the service environment of the heat exchange surface pipes is more complex and harsh. In addition to the corrosion of the pipe wall deposition phase, the corrosive gases such as HCl and SO ₂ in the flue gas will also affect the pipe wall. At the same time, the collision between the high-speed flow of fly ash particles in the flue gas and the heating surface will cause erosion damage to the pipe wall. In order to improve the accuracy and reliability of the test results and provide guidance for field application, a test device was built to simulate the erosion of fuel fly ash on the heating surface and the coupled corrosion of flue gas, so as to realize the erosion resistance of the material to be tested- A rapid assessment of corrosion performance is necessary.

The prior art has carried out different degrees of research on corrosion field tests. CN111323364A discloses a homogenized deposition salt thermal corrosion test device and method, which mainly uses an atomizer to atomize the salt solution and deposit on the material surface to form corrosion Salt film. CN106769822A discloses a high temperature corrosion test system, which utilizes a cyclone gas mixing tank and water vapor to explore the corrosion resistance performance of materials under the condition that only corrosive gas and high temperature water vapor exist. The above studies mostly use pure substances as corrosive media and carry out material tests under single corrosive conditions. Further, CN209878565U discloses a test device for thermal corrosion resistance of heat-resistant materials in a combustion atmosphere, which simulates the corrosion conditions in the real atmosphere by using the flue gas generated by the combustion of the burner, and the test samples are connected into a hollow tube shape by welding, and the interior is hollow. The temperature of the sample is controlled by flowing through the flue gas and external cooling medium; however, the test device cannot control the sufficient combustion of the fuel and the temperature of the flue gas, nor can it evaluate the erosion resistance of the material. Some scholars have studied erosion-corrosion test devices. For example, CN109856036A discloses a high-temperature and high-pressure gas, liquid, and solid three-phase erosion corrosion test device and method, and CN112284953A discloses a multi-media corrosion-erosion coupling test device in an ocean temperature-variable simulated environment. , focusing on studying the erosion-corrosion coupling performance of materials in a salt spray atmosphere in a simulated ocean temperature environment, CN103149144A proposes a test device and method for high-temperature corrosion erosion performance of oil well pipe strings, and the erosion medium is sand. The above-mentioned test devices are mainly used in marine environment or oil field environment, and there is no erosion-corrosion coupling test device that can be applied to boilers.

To sum up, the existing applications or granted patents mainly have the following problems:

The corrosion type is mostly electrochemical corrosion, the corrosion temperature cannot reach the tube wall temperature of the actual heat exchange surface in the furnace, and it is impossible to simulate the whole process of fuel from ignition, combustion, fly ash impact, fly ash deposition to corrosion in situ, which cannot be realized. Rapid evaluation of erosion-corrosion resistance of materials to be tested;

The corrosive medium mostly uses pure substances such as salt solution, which is very different from the actual fuel fly ash composition, and the corrosive medium is relatively single, or only simulates the corrosion of a single-phase corrosive medium, and cannot achieve the impact resistance of the material under complex coupled corrosion conditions. Reasonable prediction of corrosion-corrosion performance;

There is a lack of research on the dynamic process of fly ash particles deposited on the surface of the sample and the corrosion reaction occurs. When the temperature of the sample fluctuates greatly, the temperature of the sample cannot be adjusted quickly and accurately, which will cause the test sample to be eroded- Large deviations in corrosion performance assessment results.

Utility model content

In view of the defects of the prior art, the purpose of this utility model is to provide a boiler heating surface anti-erosion-corrosion in-situ test system, aiming to solve the problem that the existing test system cannot simulate the anti-erosion-corrosion performance of each position inside the boiler question.

In order to achieve the above purpose, the utility model provides a boiler heating surface anti-erosion-corrosion in-situ test system, the system includes a combustion simulation device and an erosion-corrosion test device, wherein:

The combustion simulation device includes a feeding unit, a burner and a combustion chamber sequentially connected from top to bottom to simulate the flue gas environment of the actual combustion process; at the same time, the outside of the combustion chamber is sequentially provided with a combustion zone electric heater from top to bottom The heater and the sample area electric heater are used to separately heat the flue gas and the sample to be tested, and a visual window is provided under the combustion chamber;

The erosion-corrosion test device includes an ash corrosion platform, a circulating water temperature control unit and a camera, and the ash corrosion platform extends into the interior of the combustion chamber for placing a sample to be tested and performing an erosion-corrosion test; The circulating water temperature control unit is connected to the ash corrosion platform to control the temperature of the sample to be tested; the camera is arranged outside the visible window of the combustion chamber to observe the erosion of the sample to be tested in real time- corrosion process.

As a further preference, the feeding unit includes a solid fuel feeding hopper, a solid fuel feeding pipe and a combustion gas intake pipe, the solid fuel feeding hopper is connected with the solid fuel feeding pipe, and is used for feeding the burner to the burner. Solid fuel or fly ash is introduced; the combustion gas inlet pipe is used for introducing combustion gas or flue gas to the burner.

As a further preference, the solid fuel feeding hopper includes a material heater and a feeding motor, the material heater is used to preheat the solid fuel or fly ash, and the feeding motor is used to control the solid fuel or Feed rate of fly ash.

As a further preferred option, the feeding unit further includes a first corrosive gas inlet pipe for introducing corrosive gas into the combustion chamber.

As a further preference, the boiler heating surface erosion resistance-corrosion in-situ test system further includes an enhanced corrosion gas distribution unit, and the enhanced corrosion gas distribution unit includes a second corrosive gas inlet pipe and a corrosive gas flowmeter, so The second corrosive gas inlet pipe is connected to the combustion chamber for quantitatively introducing corrosive gas to further strengthen the corrosive environment; the corrosive gas flowmeter is used to control the opening of the second corrosive gas inlet pipe, to adjust the flow of the corrosive gas.

As a further preference, the ash corrosion platform includes a sample stage, a sample holder, a sample temperature control couple, a cooling water inlet and a cooling water outlet, and the sample stage and the sample holder interact with each other to be tested The sample is fixed, and the sample stage is used to adjust the angle of the sample to be tested; the sample temperature-controlling couple is set on the sample stage to measure the temperature of the sample to be tested ; The cooling water inlet and the cooling water outlet are arranged on both sides of the sample stage, and are connected with the circulating water temperature control unit to cool the test sample by means of water cooling.

As a further preference, the boiler heating surface erosion-corrosion in-situ test system further includes a flue gas analyzer, the flue gas analyzer extending into the combustion chamber for real-time monitoring of flue gas components.

As a further preference, the circulating water temperature control unit includes a water inlet pipe, a circulating water flow meter, an electric regulating valve, a circulating water pump, a water tank and a water outlet pipe connected in sequence along the water flow direction, and the water inlet pipe and the water outlet pipe are directly corroded with ash The platform is connected; the circulating water flow meter and the electric regulating valve are used to control the flow rate of the circulating water; the circulating water pump is used to pump water from the water tank to provide circulating water for the circulating water temperature control unit.

As a further preference, the boiler heating surface erosion-corrosion in-situ test system further includes a computer, and the computer is used to control the feeding unit, the electric heater in the combustion area, the electric heater in the sample area, and the circulating water control unit. temperature unit and camera.

As a further preference, the height of the combustion chamber is 0.6m-6m; the maximum heating temperature of the electric heater in the combustion zone is 1600°C, and the maximum heating temperature of the electric heater in the sample zone is 900°C.

In general, compared with the prior art, the above technical solutions conceived by the present utility model have the following beneficial effects:

1. The boiler heating surface anti-erosion-corrosion in-situ test system provided by the utility model has strong operability, and can simulate fuel ignition, combustion, fly ash impact, fly ash deposition, adhesion and corrosion with a minimum space The whole process of the reaction realizes the rapid evaluation of the erosion-corrosion resistance of materials under complex coupled corrosion conditions. The zone electric heater can heat the flue gas and the sample to be tested separately, to ensure that the fuel is completely burned out, and to create conditions for the subsequent deposition of ash particles on the surface of the sample to be tested. At the same time, by setting the sample zone electric heater and The circulating water temperature control unit can independently control the temperature of the test sample, realize the simulation of the high temperature heating surface and the tail flue in the boiler, and provide guidance for the selection of corrosion-resistant materials in different parts of the boiler. The viewing window and camera can dynamically record the whole process of the deposition, adhesion, melting and corrosion of fuel ash particles and determine the size of the ash wetting angle, providing a basis for the evaluation of the erosion-corrosion performance of the material;

2. At the same time, the utility model optimizes the structure of the feeding unit, and combines the solid fuel feed hopper, the solid fuel feed pipe, the combustion gas intake pipe and the first corrosive gas intake pipe, on the one hand, it can pass the solid fuel. Fuel combustion simulates the flue gas environment under actual combustion. On the other hand, it can also directly simulate the flue gas environment by introducing flue gas, fly ash and corrosive gas, which has a wide application range;

3. In addition, by setting the first corrosive gas inlet pipe, the second corrosive gas inlet pipe and the flue gas analyzer, the present invention can introduce corrosive gas according to the experimental needs to simulate a special application environment or strengthen the corrosive environment to achieve The rapid evaluation of the corrosion resistance of the test samples to the erosion machine flue gas and fly ash coupling corrosion, and also provides guidance for the selection of materials with erosion resistance and coupling corrosion resistance of flue gas and ash.

Description of drawings

1 is a schematic structural diagram of a boiler heating surface erosion resistance-corrosion in-situ test system provided by an embodiment of the present invention;

2 is a schematic structural diagram of an ash corrosion platform suitable for a flat plate type test sample provided by an embodiment of the present invention, wherein (a) is a front view, (b) is a side view, and (c) is a top view;

3 is a schematic structural diagram of an ash corrosion platform suitable for a cylindrical test sample provided by an embodiment of the present invention, wherein (a) is a front view, (b) is a side view, and (c) is a top view;

4 is a schematic structural diagram of a solid fuel feed hopper provided by an embodiment of the present invention;

FIG. 5 is a flow chart of an in-situ test system for erosion-corrosion resistance of a heating surface of a boiler provided by an embodiment of the present invention.

Throughout the drawings, the same reference numbers are used to refer to the same elements or structures, wherein:

1-solid fuel feeding hopper, 111-feeding motor, 112-material heater, 2-solid fuel feeding pipe, 3-combustion gas inlet pipe, 4-first corrosive gas inlet pipe, 5-burner, 6- Top flange, 7- Combustion chamber, 8- Two-stage electric heating unit, 81- Electric heater in combustion area, 82- Electric heater in sample area, 9- Enhanced corrosion gas distribution unit, 91- Corrosive gas flow meter , 92- Second corrosive gas inlet pipe, 10- Ash corrosion platform, 101- Sample to be tested, 102- Sample stage, 103- Sample temperature control couple, 104- Cooling water inlet, 105- Cooling water outlet , 106-sample fixing piece, 11-bottom flange, 12-camera, 13-flue gas analyzer, 14-circulating water temperature control unit, 141-water inlet pipe, 142-circulating water flowmeter, 143-electric adjustment Valve, 144-circulating water pump, 145-water tank, 146-water outlet pipe, 15-computer.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not intended to limit the present invention.

As shown in Figure 1, the utility model provides a boiler heating surface erosion-corrosion in-situ test system, the system includes a combustion simulation device and an erosion-corrosion test device, wherein:

The combustion simulation device includes a feed unit, a burner 5, a top flange 6, a combustion chamber 7 and a bottom flange 11 sequentially connected from top to bottom to simulate the flue gas environment of the actual combustion process; A two-stage electric heating unit 8 is provided outside, which are the electric heater 81 in the combustion area and the electric heater 82 in the sample area, which are used to separately heat the flue gas and the sample to be tested 101. The highest heating of the electric heater 81 in the combustion area is The temperature can reach 1600°C, which can ensure the further combustion and burnout of the fuel, and create conditions for the subsequent deposition of ash particles on the surface of the sample to be tested. Simulation of the medium and high temperature heating surface and the tail flue, and a visual window is provided below the combustion chamber 7 to realize real-time observation of the sample 101 to be tested;

The erosion-corrosion test device includes an ash corrosion platform 10, a circulating water temperature control unit 14, a flue gas analyzer 13 and a camera 12. The ash corrosion platform 10 extends into the interior of the combustion chamber 7 for placing the sample 101 to be tested and conducting Erosion-corrosion test; the circulating water temperature control unit 14 is connected to the ash corrosion platform 10 to control the temperature of the sample 101 to be tested. Through the interaction between the electric heater 82 in the sample area and the circulating water temperature control unit 14, the The temperature of the test sample 101 is controlled within 100°C to 750°C, simulating the temperature of different parts in the boiler to provide guidance for the selection of corrosion-resistant materials; the flue gas analyzer 13 extends into the interior of the combustion chamber 7 for real-time monitoring The flue gas composition further improves the accuracy of the erosion-corrosion in-situ test on the heating surface of the boiler; the camera 12 is arranged outside the visible window in the combustion chamber 7 to observe the erosion-corrosion process of the sample 101 to be tested in real time. The camera 12 preferably adopts a CCD camera, which can dynamically record the whole process of the deposition, adhesion, melting and corrosion of fuel ash particles, so as to determine the size of the ash wetting angle, so as to provide a basis for the evaluation of the erosion-corrosion resistance of the material.

Further, as shown in FIG. 4 , the feeding unit includes a solid fuel feeding hopper 1, a solid fuel feeding pipe 2, a combustion gas inlet pipe 3 and a first corrosive gas inlet pipe 4, the solid fuel feeding hopper 1 and the solid fuel feeding pipe 4. The feed pipe 2 is connected for feeding solid fuel or fly ash to the burner 5. The solid fuel feed hopper 1 includes a material heater 112 and a feeding motor 111. The material heater 112 is used for solid fuel or fly ash. For preheating, the feeding motor 111 is used to control the feeding rate of solid fuel or fly ash; the combustion gas inlet pipe 3 is used to introduce combustion gas or flue gas to the burner 5; the first corrosive gas inlet pipe 4 is used to Corrosive gas is introduced into the combustion chamber 7 . During operation, solid fuel and combustion gas can be introduced to simulate the actual combustion environment, or fly ash and flue gas can be directly introduced to simulate the actual combustion environment, and corrosive gas can also be introduced to simulate the corrosion process.

Further, the boiler heating surface erosion resistance-corrosion in-situ test system also includes an enhanced corrosion gas distribution unit 9, which is used to realize the rapid evaluation of the erosion resistance and flue gas fly ash coupled corrosion performance of the sample 101 to be tested. The gas unit 9 includes a second corrosive gas inlet pipe 92 and a corrosive gas flow meter 91. The second corrosive gas inlet pipe 92 is connected to the combustion chamber 7 for quantitatively introducing corrosive gas to further strengthen the corrosive environment; The corrosive gas flow meter 91 is used to control the opening of the second corrosive gas inlet pipe 92 to adjust the flow rate of the corrosive gas.

Further, as shown in FIGS. 2 and 3, the ash corrosion platform 10 includes a sample stage 102, a sample fixing member 106, a sample temperature control couple 103, a cooling water inlet 104 and a cooling water outlet 105, the sample stage 102 and the test The sample holder 106 interacts to fix the sample to be tested 101, and the sample stage 102 is used to adjust the angle of the sample to be tested 101 to change the angle between the surface of the sample to be tested 101 and the flue gas to achieve different erosion angles The rapid evaluation of the corrosion resistance of the lower material; the sample temperature control couple 103 is set on the sample stage 102 to accurately measure the temperature of the test sample 101; the cooling water inlet 104 and the cooling water outlet 105 are set on the sample stage 102 and connected to the circulating water temperature control unit 14 to cool the test sample 101 by water cooling. When the sample 101 to be tested is a flat plate structure, the cooling water inlet 104 and the cooling water outlet 105 are arranged below the sample table 102, and the cooling water cools the sample table 102 by circulating flow; In the case of a tubular structure, the cooling water inlet 104 and the cooling water outlet 105 are connected to both sides of the tubular structure, and the cooling water cools the test sample 101 by circulating flow.

Further, the circulating water temperature control unit 14 includes a water inlet pipe 141, a circulating water flow meter 142, an electric regulating valve 143, a circulating water pump 144, a water tank 145 and a water outlet pipe 146 connected in sequence along the water flow direction. The water inlet pipe 141 and the water outlet pipe 146 are directly connected to The ash corrosion platform 10 is connected; the circulating water flow meter 142 and the electric regulating valve 143 are used to control the flow rate of the circulating water;

Further, the erosion-corrosion in-situ test system for the heating surface of the boiler further includes a computer 15 for controlling the feeding unit, the electric heater 81 in the combustion area, the electric heater 82 in the sample area, the circulating water temperature control unit 14 and the camera 12, Including the feeding speed of the feeding motor 111, the preheating temperature of the fuel, the temperature of the flue gas and the sample to be tested, the flow rates of the combustion gas, the first corrosive gas and the second corrosive gas, and the recording and analysis of the camera 12 process etc.

Further, the height of the combustion chamber 7 is 0.6m-6m; the maximum heating temperature of the electric heater 81 in the combustion area is 1600°C, and the maximum heating temperature of the electric heater 82 in the sample area is 900°C. The solid fuel can be one or more of coal, biomass, solid regenerated fuel, and garbage-derived fuel; the combustion gas can be one or more of CH ₄ , C ₂ H ₄ and H ₂ , together with combustion accelerants Such as O ₂ or air; the corrosive gas can be one or more of HCl, SO ₂ , SO ₃ and H ₂ S.

As shown in FIG. 5 , the use method of the anti-erosion-corrosion in-situ test system for the boiler heating surface provided by the present utility model includes the following steps:

S1 weighs a certain amount of solid fuel and puts it into the solid fuel feed hopper 1, fixes the sample to be tested 101 on the ash corrosion platform 10, and adjusts the angle of the sample to be tested 101 through the sample stage 102;

S2 sets the heating temperature of the electric heater 81 in the combustion area and the electric heater 82 in the sample area, and simultaneously sets the temperature of the sample to be tested 101;

S3 starts the circulating water pump 144 and the heating switch of the circulating water temperature control unit 14;

S4 connects the combustion gas inlet pipe 3, the first corrosive gas inlet pipe 4 and the second corrosive gas inlet pipe 92;

S5 Start the feeding motor 111 to make the solid fuel start to burn, conduct the erosion-corrosion test on the test sample 101, and use the camera 12 to dynamically record the entire process of the deposition and corrosion of fuel ash particles, and determine the ash wetting angle after analysis by the computer 15. the size of;

S6 After the test is over, turn off each component in turn and take out the sample.

Then those skilled in the art will easily understand that the above are only the preferred embodiments of the present invention, and are not intended to limit the present invention, and any modifications and equivalent replacements made within the spirit and principles of the present invention and improvements, etc., should be included within the scope of protection of the present invention.

Claims (10)

1. The anti erosion-corrosion in-situ test system for the heating surface of the boiler is characterized by comprising a combustion simulation device and an erosion-corrosion test device, wherein:

the combustion simulation device comprises a feeding unit, a combustor (5) and a combustion chamber (7) which are sequentially connected from top to bottom so as to simulate the flue gas environment in the actual combustion process; meanwhile, a combustion area electric heater (81) and a sample area electric heater (82) are sequentially arranged outside the combustion chamber (7) from top to bottom and used for separately heating smoke and a sample (101) to be tested, and a visible window is arranged below the combustion chamber (7);

the erosion-corrosion test device comprises an ash corrosion platform (10), a circulating water temperature control unit (14) and a camera (12), wherein the ash corrosion platform (10) extends into the combustion chamber (7) and is used for placing a sample (101) to be tested and carrying out an erosion-corrosion test; the circulating water temperature control unit (14) is connected with the ash corrosion platform (10) to control the temperature of the sample (101) to be tested; the camera (12) is arranged on the outer side of a visible window of the combustion chamber (7) to observe the erosion-corrosion process of the sample (101) to be measured in real time.

2. The system for in-situ testing erosion-corrosion resistance of the heating surface of the boiler as claimed in claim 1, wherein the feeding unit comprises a solid fuel feeding hopper (1), a solid fuel feeding pipe (2) and a combustion gas inlet pipe (3), the solid fuel feeding hopper (1) is connected with the solid fuel feeding pipe (2) and is used for feeding solid fuel or fly ash to the combustor (5); the combustion gas inlet pipe (3) is used for introducing combustion gas or smoke into the combustor (5).

3. The system for in-situ testing erosion-corrosion resistance of the heating surface of the boiler as claimed in claim 2, wherein the solid fuel feed hopper (1) comprises a material heater (112) and a feed motor (111), the material heater (112) is used for preheating the solid fuel or the fly ash, and the feed motor (111) is used for controlling the feed rate of the solid fuel or the fly ash.

4. The in-situ test system for erosion-corrosion resistance of the heating surface of the boiler as set forth in claim 1, wherein the feeding unit further comprises a first corrosive gas feeding pipe (4) for feeding a corrosive gas into the combustion chamber (7).

5. The system for in-situ testing erosion-corrosion resistance of the heating surface of the boiler as set forth in claim 1, characterized in that the system for in-situ testing erosion-corrosion resistance of the heating surface of the boiler further comprises an intensified corrosion gas distribution unit (9), the intensified corrosion gas distribution unit (9) comprises a second corrosive gas inlet pipe (92) and a corrosive gas flowmeter (91), the second corrosive gas inlet pipe (92) is connected with the combustion chamber (7) and is used for quantitatively introducing corrosive gas so as to further intensify a corrosive environment; the corrosive gas flowmeter (91) is used for controlling the opening degree of a second corrosive gas inlet pipe (92) so as to adjust the flow of the corrosive gas.

6. The in-situ test system for resisting erosion-corrosion of the heating surface of the boiler as claimed in claim 1, wherein the ash corrosion platform (10) comprises a sample table (102), a sample fixing member (106), a sample temperature control galvanic couple (103), a cooling water inlet (104) and a cooling water outlet (105), the sample table (102) and the sample fixing member (106) interact to fix the sample (101) to be tested, and the sample table (102) is used for adjusting the angle of the sample (101) to be tested; the sample temperature control electric couple (103) is arranged on the sample table (102) and is used for measuring the temperature of the sample (101) to be measured; the cooling water inlet (104) and the cooling water outlet (105) are arranged on two sides of the sample table (102) and are connected with the circulating water temperature control unit (14) so as to cool the sample (101) to be tested in a water cooling mode.

7. The in-situ test system for the erosion resistance and the corrosion resistance of the heating surface of the boiler as set forth in claim 1, characterized in that the in-situ test system for the erosion resistance and the corrosion resistance of the heating surface of the boiler further comprises a flue gas analyzer (13), and the flue gas analyzer (13) extends into the combustion chamber (7) and is used for monitoring the components of the flue gas in real time.

8. The in-situ test system for the erosion-corrosion resistance of the heating surface of the boiler as claimed in claim 1, wherein the circulating water temperature control unit (14) comprises a water inlet pipe (141), a circulating water flow meter (142), an electric regulating valve (143), a circulating water pump (144), a water tank (145) and a water outlet pipe (146) which are connected in sequence along the water flow direction, and the water inlet pipe (141) and the water outlet pipe (146) are directly connected with the ash corrosion platform (10); the circulating water flow meter (142) and the electric regulating valve (143) are used for controlling the flow rate of circulating water; the circulating water pump (144) is used for pumping water from the water tank (145) to provide circulating water for the circulating water temperature control unit (14).

9. The in-situ test system for resisting erosion-corrosion of the heating surface of the boiler as set forth in claim 1, characterized in that the in-situ test system for resisting erosion-corrosion of the heating surface of the boiler further comprises a computer (15), and the computer (15) is used for controlling the feeding unit, the combustion area electric heater (81), the sample area electric heater (82), the circulating water temperature control unit (14) and the camera (12).

10. The in-situ test system for erosion-corrosion resistance of the heating surface of the boiler as set forth in any one of claims 1 to 9, wherein the height of the combustion chamber (7) is 0.6m to 6 m; the highest heating temperature of the combustion area electric heater (81) is 1600 ℃, and the highest heating temperature of the sample area electric heater (82) is 900 ℃.

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