Coupled high-temperature and high-pressure small punch ammonia corrosion experimental device

Abstract

The utility model provides a coupling high-temperature and high-pressure small punch ammonia corrosion experimental device which is characterized in that a sample is clamped between an upper clamp (8) and a lower clamp (10) and is positioned in a heating furnace (6), and the experimental device introduces experimental mixed gas to the lower part of the sample (9) through a vertical channel in the lower clamp; the upper clamp is sequentially provided with a small punch (7) and a ball (5) which are used for applying pressure to the sample from top to bottom; the lower clamp is supported by a water cooling device below the lower clamp, and a stress sensor for detecting the stress of the sample is arranged below the water cooling device; the utility model has the advantages of simple structure, convenience in assembly, wide application range and higher stability.

Description

TECHNICAL FIELD

[0001] The utility model relates to experimental equipment technical field especially a kind of coupling high temperature high pressure small punch rod ammonia corrosion experimental device. BACKGROUND

[0002] In some tests to obtain the corrosion of material, diversified experimental devices are often needed to meet the requirements of different tests, such as small punch rod experimental devices, which need to meet the experimental requirements under different conditions, such as high temperature, high pressure, corrosive gas, etc. To ensure the smooth operation of the experimental device under complex conditions, the temperature and pressure need to be accurately controlled to prevent damage to the equipment due to high temperature or leakage due to high pressure, and to prevent corrosion of corrosive gas to the clamp. At present, the research on in-situ hydrogen charging experimental devices under pressure is more common, and the research on coupled conditions is less.

[0003] Therefore, in view of the above problems, several small punch rod experimental devices are currently disclosed. Mainly belong to high-pressure in-situ hydrogen charging experimental device, low-temperature in-situ hydrogen charging experimental device, small punch rod experimental device under methane / hydrogen environment, etc. The corrosion gas used in these experimental devices is mainly hydrogen, and the variable is single temperature or pressure. There is a lack of experimental devices related to ammonia corrosion, and the conditions such as temperature, pressure and multi-component corrosive gas cannot be well unified. INVENTION CONTENTS

[0004] The utility model provides a kind of coupling high temperature high pressure small punch rod ammonia corrosion experimental device, simple structure, easy to assemble, wide application range, with higher stability.

[0005] The utility model adopts the following technical solutions.

[0006] A kind of coupling high temperature high pressure small punch rod ammonia corrosion experimental device, the sample is clamped between upper clamp (8), lower clamp (10) and located in heating furnace (6), the experimental device is passed into experimental mixed gas to the lower of sample (9) through vertical passage in lower clamp;Upper clamp is sequentially arranged from top to bottom for the small punch head (7) for applying pressure to sample, ball (5);The lower clamp is supported by the water cooling device below, and a stress sensor for testing the force of sample is provided below the water cooling device.

[0007] The small punch head is connected with the crossbeam (18) at the top of the experimental device through a straight rod, and a COD extensometer (17) for testing the deformation of the sample under stress is arranged in the middle of the straight rod.

[0008] The vertical passage in the lower clamp is communicated with the horizontal mixed gas pipeline, and the mixed gas pipeline is arranged in the lower part of the lower clamp.

[0009] The heating furnace is provided with a through hole for inserting a small punch, and the upper clamp and the lower clamp are connected to form a columnar assembly which is inserted into the heating furnace.

[0010] The mixed gas pipeline is located below the heating furnace.

[0011] One end of the mixed gas pipeline which is not inserted into the lower clamp is an air inlet end, and the air inlet end is sequentially provided with a first flow meter (2) and a first air inlet valve (1) in an air inlet direction; the other end is an air outlet end, and the air outlet end is sequentially provided with a pressure gauge (11), a safety valve (12) and an air outlet valve (13) in an air outlet direction.

[0012] The air inlet end of the mixed gas pipeline is communicated with an ammonia decomposition device (14) through an air inlet pipe, and the air inlet pipe is provided with a second air inlet valve (15) and a second flow meter (16), and each pipe section of the air inlet pipe is connected through a touch connector.

[0013] The air outlet end of the mixed gas pipeline is communicated with a tail gas treatment device through an air outlet pipe.

[0014] A plurality of thermocouples are inserted into the heating furnace, and the detection surfaces of the thermocouples are respectively arranged at the upper clamp, the lower clamp and the sample.

[0015] The surfaces of the upper clamp and the lower clamp are covered with an anti-corrosion coating, and a vertical channel in the lower clamp is provided with an O-ring (4) below the sample to form a gas sealing structure.

[0016] The water cooling device forms a heat insulation structure between the lower clamp and the stress sensor, and the water cooling device is connected with a water tank (23) through a water pipe, and the water pipe is provided with a water inlet valve (22) and a pump (21).

[0017] The equipment is suitable for small punch rod testing under various conditions, and can test samples under different temperature, pressure and corrosive gas conditions. The heating furnace and the thermocouples can create a high temperature environment and maintain uniform distribution of the temperature in the furnace. The experimental device has the advantages of simple structure, convenient assembly, wide application range and high stability.

[0018] In the utility model, the clamp is coated with anti-corrosion paint and is provided with a sealing ring, so that the corrosion resistance and the sealing property of the experimental device are ensured, and the water cooling device is arranged between the clamp and the stress sensor, so that the stress sensor can be prevented from being damaged by high temperature in the experimental process. BRIEF DESCRIPTION OF DRAWINGS

[0019] The utility model will be further explained in detail in combination with the drawings and the specific embodiments:

[0020] ATTACHMENT Figure 1 It is the assembly schematic view of the upper clamp and the lower clamp.

[0021] ATTACHMENT Figure 2It is the connecting schematic view of the utility model during experiment;

[0022] In the figure: 1: first air inlet valve; 2: first flowmeter; 3: thermocouple (total three); 4: O ring; 5: ball; 6: heating furnace; 7: small punch; 8: upper clamp; 9: sample; 10: lower clamp; 11: pressure gauge; 12: safety valve; 13: exhaust valve; 14: ammonia decomposition device; 15: second air inlet valve; 16: second flowmeter; 17: COD type extensometer; 18: crossbeam; 19: tail gas treatment device; 20: stress sensor; 21: pump; 22: water inlet valve; 23: water tank. DETAILED DESCRIPTION

[0023] As shown in the figure, a kind of coupling high temperature high pressure small punch ammonia corrosion experimental device, the sample is clamped between upper clamp 8, lower clamp 10 and located in heating furnace 6, the experimental device is passed into experimental mixed gas to the lower of sample 9 through vertical passage in lower clamp;Upper clamp is sequentially arranged from top to bottom for the small punch 7 of sample pressure, ball 5;The lower water cooling device of lower clamp is supported, and the stress sensor for testing the force of sample is arranged below the water cooling device.

[0024] The small punch is connected with the crossbeam 18 of the top of experimental device through straight bar, and the middle of straight bar is provided with COD type extensometer 17 for testing the stress deformation of sample.

[0025] The vertical passage in lower clamp is communicated with horizontal mixed gas pipeline, and the mixed gas pipeline is arranged in the lower part of lower clamp.

[0026] The heating furnace is provided with a through hole for the insertion of small punch, and the upper clamp and lower clamp are connected to form a cylindrical assembly, which is inserted into the heating furnace.

[0027] The mixed gas pipeline is located below the heating furnace.

[0028] One end of the mixed gas pipeline, which is not inserted into the lower clamp, is the gas inlet end, which is sequentially provided with first flowmeter 2 and first air inlet valve 1 in the gas inlet direction;The other end is the gas outlet end, which is sequentially provided with pressure gauge 11, safety valve 12 and exhaust valve 13 in the gas outlet direction.

[0029] The gas inlet end of the mixed gas pipeline is communicated with ammonia decomposition device 14 through inlet pipe, and second air inlet valve 15 and second flowmeter 16 are arranged at the inlet pipe, and each pipe section of the inlet pipe is connected by a touch connector.

[0030] The gas outlet end of the mixed gas pipeline is communicated with tail gas treatment device through exhaust pipe.

[0031] The heating furnace is provided with a plurality of thermocouples, and the detection surfaces of the thermocouples are respectively arranged at the upper clamp, the lower clamp and the sample.

[0032] The upper clamp and the lower clamp are provided with an anticorrosion coating, and the vertical channel in the lower clamp is provided with an O-ring 4 to form a gas sealing structure.

[0033] The water cooling device forms a heat insulation structure between the lower clamp and the stress sensor, and the water cooling device is connected with the water tank 23 through a water pipe, and the water pipe is provided with a water inlet valve 22 and a pump 21.

[0034] Embodiment:

[0035] The embodiment provides a high-temperature and high-pressure small punch ammonia corrosion experimental device based on a simple mechanical structure, and mainly solves the problem of ammonia corrosion test of a small punch sample under high-temperature and high-pressure conditions, and is suitable for test operation of multi-component corrosion gas. The clamp mainly comprises an air inlet valve 1, a flowmeter 2, a thermocouple 3, an O-ring 4, a ball 5, a heating furnace 6, a small punch 7, an upper clamp 8, a sample 9, a lower clamp 10, a pressure gauge 11, a safety valve 12 and an exhaust valve 13.

[0036] The upper clamp 8 and the lower clamp 10 are connected through threads, the sample 9 is fixed between the upper clamp and the lower clamp, the small punch 7 applies pressure to the ball 5 to press the sample 9 downward, mixed gas passes below the sample 9, and the O-ring 4 is used to ensure sealing.

[0037] In use, the experimental device is assembled first, the ammonia decomposition reactor is connected with the gas pipeline, the gas pipelines are connected through a one-touch connector, and the equipment is sequentially connected with a stress sensor, a water cooling module, a lower clamp, an upper clamp, a small punch and a pressure rod from bottom to top. The COD extensometer is connected with the pressure rod, the water cooling device is composed of a pipeline, a water tank and a pump, the gas pipeline is connected with an exhaust treatment device, and at this time, the device is assembled.

[0038] When starting the high-temperature and high-pressure small punch ammonia corrosion experiment, the sample is assembled first, the upper clamp and the lower clamp are taken down, the sealing ring is compressed and sealed, the polished sample is placed in the groove of the lower clamp, the upper clamp and the lower clamp are connected and fixed to the sample, the small punch is placed after the ball, the assembled clamp is installed back to the experimental device. Then, the clamp is pumped to vacuum by using a vacuum pump, the ammonia decomposition device is opened to generate mixed gas, the heating furnace is opened, the temperature in the furnace is adjusted, the pump is opened to start the water cooling device, the valve is opened after the temperature in the heating furnace is stable, the mixed gas is introduced to start the experiment. After the small punch is pressed to break the sample, the experiment is finished, the ammonia decomposition reactor is closed and the heating is stopped, the exhaust treatment device is closed, the exhaust valve is opened after the temperature is cooled to room temperature, the exhaust treatment device is closed after the experiment, the pump is closed, and the power supply is turned off.

Claims

1. A high-temperature high-pressure small-punch ammonia corrosion experiment device coupled, characterized by: The sample is clamped between the upper clamp (8) and the lower clamp (10) and is located in the heating furnace (6), the experimental device passes the experimental mixed gas to the lower part of the sample (9) through the vertical channel in the lower clamp; the upper clamp is sequentially provided with a small punch (7) for applying pressure to the sample and a ball (5) from top to bottom; the lower clamp is supported by the water cooling device below, and the water cooling device below is provided with a stress sensor for testing the stress of the sample.

2. The high-temperature and high-pressure small-punch ammonia corrosion test device according to claim 1, characterized in that: The small punch is connected with the cross beam (18) at the top of the experimental device through a straight rod, and a COD type extensometer (17) for testing the stress deformation of the sample is arranged in the middle of the straight rod.

3. The high-temperature and high-pressure small-punch ammonia corrosion test device according to claim 1, characterized in that: The vertical channel in the lower clamp is communicated with the horizontal mixed gas pipeline, and the mixed gas pipeline is arranged in the lower part of the lower clamp.

4. The high-temperature and high-pressure small-punch ammonia corrosion test device coupled according to claim 3, characterized in that: A through hole for inserting the small punch is arranged above the heating furnace, and the upper clamp and the lower clamp are connected to form a cylindrical assembly which is inserted into the heating furnace.

5. The high-temperature and high-pressure small-punch ammonia corrosion test device coupled according to claim 3, characterized in that: The mixed gas pipeline is located below the heating furnace.

6. The high-temperature and high-pressure small-punch ammonia corrosion test device coupled according to claim 3, characterized in that: One end of the mixed gas pipeline which is not inserted into the lower clamp is the gas inlet end, and the first flowmeter (2) and the first gas inlet valve (1) are sequentially arranged in the gas inlet direction; the other end is the gas outlet end, and the pressure gauge (11), the safety valve (12) and the exhaust valve (13) are sequentially arranged in the gas outlet direction.

7. The high-temperature and high-pressure small-punch ammonia corrosion test device coupled according to claim 6, characterized in that: The gas inlet end of the mixed gas pipeline is communicated with the ammonia decomposition device (14) through the inlet pipe, and the second gas inlet valve (15) and the second flowmeter (16) are arranged at the inlet pipe; the pipe sections of the inlet pipe are connected by a touch connector.

8. The high-temperature and high-pressure small-punch ammonia corrosion test device coupled according to claim 6, characterized in that: The gas outlet end of the mixed gas pipeline is communicated with the tail gas treatment device through the exhaust pipe.

9. The high-temperature and high-pressure small-punch ammonia corrosion test device coupled according to claim 3, characterized in that: A plurality of thermocouples are inserted into the heating furnace, and the detection surfaces of the thermocouples are respectively arranged at the upper clamp, the lower clamp and the sample.

10. The high-temperature and high-pressure small-punch ammonia corrosion test device coupled according to claim 3, characterized in that: The surfaces of the upper clamp and the lower clamp are covered with an anti-corrosion coating, and the vertical channel in the lower clamp forms a gas sealing structure with the O-ring (4) below the sample. The water cooling device forms a heat insulation structure between the lower clamp and the stress sensor, and the water cooling device is connected with the water tank (23) through the water pipe, and the water valve (22) and the pump (21) are arranged at the water pipe.

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