CN110608992B - Probe device and method for testing high-temperature corrosion resistance of metal material on heating surface of garbage incineration boiler - Google Patents
Probe device and method for testing high-temperature corrosion resistance of metal material on heating surface of garbage incineration boiler Download PDFInfo
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- CN110608992B CN110608992B CN201910987607.6A CN201910987607A CN110608992B CN 110608992 B CN110608992 B CN 110608992B CN 201910987607 A CN201910987607 A CN 201910987607A CN 110608992 B CN110608992 B CN 110608992B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/04—Corrosion probes
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Abstract
The invention discloses a probe device and a method for testing high-temperature corrosion resistance of a metal material of a heating surface of a waste incineration boiler, which can be used for carrying out on-line high-temperature corrosion simulation test of the heating surface in the waste incineration power plant. According to the invention, through the design of gas backflow of the inner sleeve and the outer sleeve, the temperature controllability of the test piece is realized by independently sealing the inner space. In order to avoid the influence of galvanic corrosion on experimental results caused by direct contact of different metals in a welding or threaded connection mode, the invention adopts the split tightening clamp flange as a connecting part for connecting a test piece and a device main body, so that a high-temperature-resistant rubber gasket is filled between the flange and the test piece as a barrier layer. This also ensures the good leakproofness of device simultaneously, has realized the convenient dismouting of test piece. The invention has the advantages of simple design, portability and wide application range, can realize the test of the high-temperature corrosion resistance of different metal materials in the waste incineration power plant, and is suitable for the field study of the high-temperature corrosion of the heating surface of the boiler.
Description
Technical Field
The invention belongs to the field of high-temperature corrosion of metals, and particularly relates to a probe device and a method for testing high-temperature corrosion resistance of a metal material on a heating surface of a garbage incineration boiler.
Background
In recent years, the waste incineration industry of China is rapidly developed. In 2017, china has built 286 seats of household garbage incineration harmless treatment plants, and the number of the seats is far from that of household garbage sanitation landfill harmless treatment plants, but the seats are replaced by the seats.
However, since household garbage is various and complex in composition, a number of problems occur in the actual operation of the garbage incineration system. The high-temperature corrosion of the heating surface of the boiler is particularly remarkable, and in field detection, corrosion phenomena with different degrees are found at relatively low temperature parts of the main high-temperature heating surface such as an over-heater, an economizer, a water cooling wall and an air preheater.
For such studies, in addition to the mechanism research type experiments performed in the laboratory, some in-situ test experiments are required to be performed to verify theoretical results in the laboratory and to screen materials with excellent properties.
The traditional field corrosion test mostly adopts a hanging method, the test period is easily limited by the production condition and maintenance plan of a factory, and the test period is relatively passive. Because the actual heating surface material is usually heated in the hearth on one side, has higher temperature, and the other side is in the external environment or is in contact with a low-temperature working medium, the wall temperature is often lower than the temperature of flue gas in the furnace, and the actual wall temperature cannot be simulated by adopting the in-furnace hanging plate rule, which is also a great disadvantage of the hanging plate method.
To improve flexibility and accuracy, some researchers have developed probe devices to simulate corrosion tests on-line. The basic principle of the probe is to simulate the corrosion process of the actual heating surface, and the external temperature of the heating surface is generally simulated by means of air cooling or water cooling and the like, so that the controllable simulation of the temperature condition is realized. However, the existing corrosion probe device is rough in design and imperfect in temperature simulation, for example, an annular test piece is sleeved on the outer surface of the steel pipe in an interference fit manner, air is introduced into the steel pipe for cooling, and the temperature transfer resistance is high. Most of the probe devices do not pay attention to galvanic corrosion and stress corrosion, and violate the general principles of metal corrosion tests, for example, the direct contact of different metals or the connection between metals adopts a welding process [PHONGPHIPHAT A,RYU C,YANG Yao-bin,et al.Investigation into high-temperature corrosion in a large-scale municipal waste-to-energy plant]., so that the probe device has the advantages of simple design, portability, convenient operation and wider application range and better application prospect, and meets the general principles of metal corrosion tests.
Disclosure of Invention
The invention provides a probe device and a method for testing the high-temperature corrosion resistance of a metal material on the heating surface of a waste incineration boiler, which can realize on-line installation and disassembly at any time in the operation process of the boiler and are convenient to operate. The invention adopts a simple and flexible installation mode, the tubular design is convenient to carry, the application occasion is wide, and the invention has good economy and application range.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The probe device for testing the high-temperature corrosion resistance of the metal material of the heating surface of the garbage incineration boiler comprises an outer sleeve, an inner sleeve coaxially arranged with the outer sleeve, a tubular test piece assembled at the outlet end of the outer sleeve, a top end cover for fixing the tubular test piece, a thermocouple penetrating through the inner sleeve and a gas path channel, wherein a gap is reserved between the inner pipe wall of the outer sleeve and the outer pipe wall of the inner sleeve;
The inner sleeve pipe is provided with a groove for installing a thermocouple, and is provided with a cooling gas inlet with an opening and closing valve;
the inlet end of the outer sleeve is sealed with the outer tube wall of the inner sleeve, so that a sealing channel for gas circulation is formed between the inner tube wall of the outer sleeve and the outer tube wall of the inner sleeve;
The thermocouple is connected with the thermocouple display instrument, is nested and fixed at the groove of the inlet end of the inner sleeve in a clamping manner, and the temperature measuring end of the thermocouple penetrates through the tubular test piece and is abutted with the top end cover.
Preferably, the contact surface of the top end cover and the tubular test piece is provided with a rubber gasket.
As the preferable mode of the invention, the connection mode of the tubular test piece and the outlet end of the outer sleeve is flange connection, the outlet end of the outer sleeve is welded with a first flange, and the first flange is in bolt connection with the top end cover of the fixed tubular test piece.
The tubular test piece is arranged between the split type clamp flange and the split type clamp flange end cover and coaxial with the outer sleeve, and the first flange, the split type clamp flange and the split type clamp flange end cover are connected through positioning bolts.
Preferably, the gas path channel comprises a cooling gas inlet pipeline and a heated gas outlet pipeline, wherein one end of the cooling gas inlet pipeline is connected with a cooling gas inlet on the inner sleeve, the other end of the cooling gas inlet pipeline is connected with a compressed air source, one end of the heated gas outlet pipeline is connected with a heated gas outlet on the outer sleeve, and the other end of the heated gas outlet pipeline is a free end.
Preferably, the furnace wall further comprises a furnace wall outer surface flange and an outer sleeve flange fixed on the outer sleeve wall of the outer sleeve, wherein the outer sleeve flange is fixed with the furnace wall through the furnace wall outer surface flange.
Compared with the prior corrosion probe technology, the invention has the following beneficial effects:
(1) Compared with the field corrosion film hanging method, the method controls the surface temperature of the test piece by adjusting the flow velocity of compressed air flowing in the gap between the inner sleeve and the outer sleeve, and realizes the automatic control of the surface temperature of the test piece.
(2) The flange and the test piece adopt the design of the high-temperature-resistant rubber interlayer, so that direct contact between different metals is avoided, and the influence of galvanic corrosion is effectively eliminated.
(3) The device and the furnace wall are connected by adopting a movable split type clamp flange, the insertion depth of the device can be freely adjusted, and the test device is easy to install and disassemble.
(4) The split type clamp flange at two ends of the test piece and the use of the positioning bolts in the test area realize that the test piece can be detached under the condition that the test piece surface is not directly contacted after the test is completed, so that the damage to the fragile corrosion layer during the detachment of the test piece is avoided, and the accuracy of test data is improved.
(5) The probe device can be installed and disassembled on line at any time in the running process of the boiler, and is convenient to operate.
Drawings
FIG. 1 is a schematic diagram of the structure and installation of a probe device for testing the high-temperature corrosion resistance of a metal material on the heating surface of a waste incineration boiler;
FIG. 2 is an enlarged partial schematic view of the portion A of FIG. 1 in full section provided by the present invention;
Fig. 3 is a front view of the components 7, 14, 17 provided by the invention;
the meaning of each symbol in the above figures is as follows:
Thermocouple display 1, thermocouple 2, inner sleeve 3, inner sleeve inlet end 3a, inner sleeve outlet end 3b, cooling gas inlet 4, heated gas outlet 5, heated gas outlet pipe 6, outer sleeve flange 7, furnace wall outer surface flange 8, furnace wall 9, outer sleeve 10, outer sleeve inlet end 10a, outer sleeve outlet end 10b, test piece 11, fireproof cotton 12, first flange 13, split-type clamp flange 14, positioning bolt 15, high temperature resistant rubber grommet 16a, high temperature resistant rubber gasket 16b, split-type clamp flange end cover 17, and top cover groove 18.
Detailed Description
As shown in fig. 1 and 2, the probe device for testing the high temperature corrosion resistance of the metal material comprises a thermocouple display instrument 1, a thermocouple 2, an inner sleeve 3, an inner sleeve inlet end 3a, an inner sleeve outlet end 3b, a cooling gas inlet 4, a heated gas outlet 5, a heated gas outlet pipe 6, an outer sleeve flange 7, a furnace wall outer surface flange 8, a furnace wall 9, an outer sleeve 10, an outer sleeve inlet end 10a, an outer sleeve outlet end 10b, a test piece 11, fireproof cotton 12, a first flange 13, a split type clamp flange 14, a positioning bolt 15, a high temperature resistant rubber grommet 16a, a high temperature resistant rubber gasket 16b, a split type clamp flange end cover 17 and a top cover groove 18.
The front view of the outer sleeve flange 7, the split clamping flange 14 and the split clamping flange end cap 17 is shown in fig. 3.
As a preferred embodiment of the invention, the outlet end of the inner sleeve is positioned at the same end as the outlet end of the outer sleeve and is positioned in the outer sleeve, the end is completely opened, the inlet end of the inner sleeve is positioned at the same end as the inlet end of the outer sleeve and is positioned outside the outer sleeve, the inlet end of the outer sleeve is sealed with the outer tube wall of the inner sleeve, a gap for gas circulation is reserved between the inner sleeve and the outer sleeve, and the inlet end of the inner sleeve is provided with a groove for installing a thermocouple.
In a preferred embodiment of the invention, a cooling gas inlet is arranged on the outer pipe wall of the inner sleeve and is close to the inlet end of the inner sleeve, the cooling gas inlet is provided with an opening and closing valve device and is connected with a cooling gas inlet pipeline, a heated gas outlet is arranged on the outer pipe wall of the outer sleeve and is close to the inlet end of the outer sleeve, the heated gas outlet is provided with an opening and closing valve device and is connected with a heated gas outlet pipeline, and high-temperature alloy steel is used as pipeline materials.
The invention is characterized in that the outer sleeve is made of high-temperature corrosion resistant alloy steel, the cross section of the outer sleeve is round, the cross section of the inner sleeve is identical to that of the outer sleeve, the tubular test piece is made of a certain metal material to be tested, the cross section of the tubular test piece is round, the whole tubular test piece is connected with the outlet end of the outer sleeve in a flange connection mode, and all the places where the flange and the test piece are possibly contacted are blocked by high-temperature resistant rubber gaskets. In connection with an example, the probe device is manufactured by the process in which the outer sleeve 10 is the main body of the device, as shown in FIG. 1, on the basis of which other components can be considered to be mounted.
First, a metal material to be tested is selected for testing, and a tubular test piece 11 is manufactured. The split type clamp flange 14 is installed at one end of the test piece 11, when the split type clamp flange 14 is installed, the inner ring surface of the split type clamp flange 14 is padded with the high-temperature resistant rubber backing ring 16a, the end surface of the test piece 11 is padded with the high-temperature resistant rubber backing ring 16b, and the purpose is to prevent the split type clamp flange 14 from being in direct contact with the outer surface of the test piece 11, and then tightening bolts of the split type clamp flange 14 are tightened. The other end of the test piece 11 is provided with a split type clamp flange end cover 17, and when the split type clamp flange end cover 17 is installed, the inner ring and the end face of the clamp flange are also padded with a high-temperature-resistant rubber backing ring 16a and a high-temperature-resistant rubber washer 16b, so that the split type clamp flange end cover 17 is prevented from being in direct contact with the outer surface of the test piece 11. The split type clamp flange 14 and the split type clamp flange end cover 17 at the two ends of the test piece 11 are provided with four bolt holes, and the bolt holes of the two flanges are required to be completely aligned during installation.
Then, the outer jacket tube 10 is manufactured, and the outer jacket tube 10 is made of high-temperature corrosion resistant alloy steel, the length of which is determined according to the depth of insertion into the furnace through the furnace wall at the time of the test, and the thickness of which is larger than that of the test piece 11, specifically, the inner diameter of the outer jacket tube 10 and the inner diameter of the test piece 11 are required to be equal, and the outer diameter is required to be larger than that of the test piece 11. After the length and thickness of the flange are determined, the first flange 13 is welded at the outlet end 10b of the flange, four bolt holes are formed in the first flange and are used for being in butt joint with the flange on the test piece, and the bolt holes of the first flange 13 are completely aligned with the bolt holes of the split type clamp flange 14 and the split type clamp flange end cover 17 during installation. After the holes of the three flanges are aligned, four positioning bolts 15 are installed, the installation of the positioning bolts 15 is illustrated in fig. 2, the heads of the bolts are located at the left side of the first flange 13, a screw rod is inserted through the flange holes on the outer sleeve, sequentially penetrates through the split type clamp flange 14 and the split type clamp flange end cover 17, and after penetrating through the split type clamp flange 14, two nuts are installed on the screw rod and used for connecting and fixing the first flange 13 and the split type clamp flange 14. After passing through the bolt holes on the split type clamp flange end cover 17, two nuts are installed on the screw rod on the right side of the split type clamp flange end cover 17 and used for fixing the installation position of the split type clamp flange end cover 17. Note that during assembly, a high temperature resistant sealing rubber gasket is placed between the first flange 13 and the split clamp flange 14 for preventing gas leakage and maintaining the overall tightness of the device. The split clamp flange end cap 17 may be uninstalled and installed after the thermocouple is installed.
Thereafter, the inner sleeve 3 is installed, and the outer diameter of the inner sleeve 3 is smaller than the inner diameter of the outer sleeve 10 to leave a passage for gas flow between the inner and outer sleeves. The inner sleeve 3 is made of common steel, is a through pipe integrally, is provided with external threads at the inlet end 3a, and is completely opened without any processing at the outlet end 3 b. The inner sleeve 3 is inserted from the outer sleeve inlet end 10a, as shown in fig. 2, with the depth of insertion of the inner sleeve 3 being approximately at the point where its outlet end 3b is aligned with the first flange 13. After the position is determined, in order to ensure concentric installation of the inner sleeve 3 and the outer sleeve 10, three-point fixing is performed between the outer wall of the inner sleeve 3 and the inner wall of the outer sleeve 10 by using welding bars. After the fixing, the gap between the inlet end 10a of the outer sleeve and the outer side surface of the inner sleeve 3 is closed by a welding method.
Then, as shown in fig. 1, a hole is formed in the side face of the outer wall on the side close to the inlet end 10a of the outer sleeve, the hole diameter is equal to the inner diameter of the outer sleeve 10, after the hole is formed, a heated gas outlet 5 is welded on the hole, threads are cut on the heated gas outlet 5 and used for installing a valve, threads are cut on the valve and used for installing a heated gas outlet pipe 6, and the heated gas outlet pipe 6 is made of high-temperature-resistant alloy steel.
Then, as shown in fig. 1, the side surface of the outer wall near the inlet end 3a of the inner sleeve is provided with holes, the pore size is equal to the inner diameter of the cooling gas inlet pipeline, after the holes are formed, the cooling gas inlet 4 is welded on the holes, threads are cut on the cooling gas inlet 4 for installing a valve, and threads are cut on the valve for installing the cooling gas inlet pipeline. In the field example, the cooling gas inlet pipeline is designed by adopting a pipe special for a compressed air cabinet of a garbage incineration power plant, so that the pipeline is not prepared by itself, and only the cooling gas inlet valve is manufactured according to the standard pipe diameter of the compressed gas used by the power plant when the device is manufactured.
Finally, the thermocouple 2 is installed, the thermocouple 2 adopts a K-type thermocouple, and the length of the thermocouple 2 is ensured to be long enough before installation, namely at least longer than the distance between the inlet end 3a of the inner sleeve and the top end cover of the device. The thermocouple 2 is installed by inserting the inlet end 3a of the inner sleeve, pushing the front end measuring end into a top cover groove 18 reserved in the center of the split type clamp flange end cover 17 (shown in figure 2), installing the split type clamp flange end cover 17, installing nuts of the positioning bolts 15, and tightening clamp bolts of the split type clamp flange end cover 17. The installation position of the thermocouple 2 is thus determined. And then, a small-sized clamp sleeve is sleeved on the measurement extension rod of the thermocouple 2, the clamp sleeve is embedded into a groove which is prefabricated at the inlet end 3a of the inner sleeve, the clamp sleeve is locked, and then, a bolt cap is covered, so that the thermocouple 2 can be installed. The fabrication of the probe device is completed.
In use, the wall is perforated at the appropriate location of the boiler, with the aperture being sized to ensure penetration into the probe apparatus, i.e. at least greater than the overall diameter of the top test piece portion. After the hole is formed, a flange 8 on the outer surface of the furnace wall is arranged, a cooling gas inlet and a compressed air source are connected, compressed air is not introduced, a probe device extends into the furnace from the opening through the furnace wall and is arranged at an angle of 90 degrees with flue gas flow, and the position of a test piece is completely exposed under the flushing of flue gas in the furnace. After the probe device is inserted, the overall diameter of the top test piece part is larger than that of the outer sleeve body, so that fillers are required to be added between the furnace wall and the probe for fixing, as shown in the figure I, fireproof cotton 12 is added, the space is not required to be completely filled, and only the space below the device is required to be filled for supporting, so that the head of the device is prevented from sagging due to the action of gravity. The method comprises the steps of locking an outer sleeve flange 7 sleeved on an outer sleeve 10, assembling and fixing the outer sleeve flange with a furnace wall outer surface flange 8, connecting a thermocouple display instrument 1 with a data line of a thermocouple 2, observing the temperature of a test piece measured currently, fully opening a valve of a heated gas outlet 5 pipeline, adjusting the valve opening of a cooling gas inlet 4 to the maximum, introducing compressed air, introducing the cooling gas from the cooling gas inlet 4 into an inner sleeve, introducing the cooling gas into a sealing channel for gas circulation between the inner pipe wall of the outer sleeve and the outer pipe wall of the inner sleeve after reaching the outlet end of the inner sleeve, discharging the cooling gas from the heated gas outlet on the outer sleeve, reducing the valve opening of the cooling gas inlet, and starting the test after the temperature of the test piece is increased to the temperature required by the test. After a period of time, reach test requirement required time, pull down outer tube flange 7, will probe device takes out in the furnace wall, accomplishes the test, pull down the test piece under the condition of not direct contact test piece surface, avoided tearing the destruction to fragile corrosion layer when getting the test piece, when need carry out the experiment of next time, only need change the test piece can.
Claims (6)
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| CN112082928B (en) * | 2020-09-11 | 2024-09-20 | 上海康恒环境股份有限公司 | High-temperature corrosion detection system for flue gas of garbage incinerator |
| CN112304788B (en) * | 2020-09-21 | 2024-10-29 | 中国石油天然气集团有限公司 | Multi-round thermal cycle test device for thermal production well casing and use method |
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