CN219104672U - Steam oxidation and flue gas coal ash corrosion cooperative test system - Google Patents
Steam oxidation and flue gas coal ash corrosion cooperative test system Download PDFInfo
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- CN219104672U CN219104672U CN202222566119.8U CN202222566119U CN219104672U CN 219104672 U CN219104672 U CN 219104672U CN 202222566119 U CN202222566119 U CN 202222566119U CN 219104672 U CN219104672 U CN 219104672U
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Abstract
The utility model relates to the technical field of simulation tests of corrosion resistance of alloys, in particular to a steam oxidation and flue gas coal ash corrosion cooperative test system, which comprises the following components: a sample support is arranged in the first tube, a boiler tube to be tested is placed on the sample support, and coal ash is coated on the outer wall of the boiler tube to be tested; the two first flanges are respectively arranged at two ends of the first pipe, the first pipe is sealed, and the first flanges at the two ends are respectively provided with an air inlet hole and an air outlet hole; the two second flanges are respectively arranged at two ends of the boiler tube to be tested, which extend out of the two first flanges, the boiler tube to be tested is sealed, and the second flanges at the two ends are respectively provided with a steam inlet hole and a steam outlet hole; the flue gas prefabricating unit is communicated with the air inlet; the steam generating unit is communicated with the steam inlet; according to the method, high-temperature steam and high-temperature flue gas are respectively introduced into the boiler tube to be tested and the first tube outside the boiler tube to be tested, the inner wall and the outer wall of the boiler tube to be tested are respectively exposed to the steam and the flue gas, and the performance test environment of steam oxidation of the inner wall and flue gas corrosion of the outer wall of the boiler tube to be tested is simulated.
Description
Technical Field
The utility model relates to the technical field of simulation tests of corrosion resistance of alloys, in particular to a steam oxidation and flue gas coal ash corrosion cooperative test system.
Background
In the service process of the high-temperature heating surface of the coal-fired power plant boiler, the inner wall of the boiler tube is oxidized by high-temperature steam for a long time to form an oxide film, and the outer wall of the boiler tube directly reacts with smoke with complex components and deposited coal ash to form a corrosion layer. On the one hand, the formation of oxide films and corrosion layers results in reduced wall thickness and reduced heat transfer efficiency of the boiler tubes; on the other hand, since the thermal expansion coefficient of the oxide film and the corrosion layer is generally smaller than that of the base metal, the oxide film and the corrosion layer are cracked or peeled off due to being subjected to a large thermal stress when the temperature is changed or the equipment is started and stopped, resulting in pipe blocking and pipe bursting. Therefore, for the active alloy or the candidate alloy of the high-temperature part in the thermal power field, the corrosion resistance of the active alloy or the candidate alloy in the environment of the synergy of steam and flue gas and coal ash is one of key indexes for measuring the performance of the alloy.
However, the existing test equipment is difficult to simultaneously realize the test of corrosion resistance of different surfaces of a sample under the action of steam and flue gas coal ash.
Disclosure of Invention
Therefore, the technical problem to be solved by the utility model is to overcome the defect that the test equipment in the prior art is difficult to realize the corrosion resistance test of different surfaces of a sample under the action of steam and flue gas and coal ash respectively, and based on the above conditions, the development of a cooperative test system for simultaneously simulating steam oxidation and flue gas and coal ash corrosion is necessary.
In order to achieve the above object, the present utility model provides a steam oxidation and flue gas soot corrosion cooperative test system, comprising:
a first tube, the inside of which is provided with a sample bracket, a boiler tube to be tested is placed on the sample bracket, and the outer wall of the boiler tube to be tested is coated with coal ash;
the two first flanges are respectively arranged at two ends of the first pipe so as to seal the two ends of the first pipe, the first flange at one end is provided with an air inlet hole, and the first flange at the other end is provided with an air outlet hole;
the two second flanges are respectively arranged at two ends of the boiler tube to be tested, which extend out of the two first flanges, so as to seal the boiler tube to be tested, steam inlet holes are arranged on the second flanges close to one end of the air inlet holes, and steam outlet holes are arranged on the second flanges close to one end of the air outlet holes;
the flue gas prefabrication unit is communicated with the air inlet hole so as to introduce flue gas into the first pipe;
and the steam generating unit is communicated with the steam inlet hole so as to introduce steam into the boiler tube to be tested.
Optionally, the method further comprises:
the first heating furnace is sleeved on the periphery of the first pipe.
Optionally, the flue gas prefabrication unit comprises:
the second pipe is provided with a cavity for storing the catalyst, and one end of the second pipe is communicated with the air inlet hole through a pipeline;
the outlet of the air mixer is communicated with the other end of the second pipe;
a plurality of gas cylinders connected in parallel, which are provided with different gases and are communicated with the inlet of the gas mixer;
the second heating furnace is sleeved on the periphery of the second pipe.
Optionally, the first heating furnace and the second heating furnace are split type cylindrical heating furnaces.
Optionally, a valve and a first mass flow meter are respectively arranged between each gas cylinder and the gas mixer.
Optionally, the steam generating unit includes:
the ultra-pure water machine, the water pump and the heater are connected in sequence;
the heater is communicated with the steam inlet through a pipeline.
Optionally, the steam generating unit further includes: the water storage tank is arranged between the ultrapure water machine and the water pump.
Optionally, the steam generating unit further includes: and the valve and the second mass flowmeter are arranged on the connecting pipeline of the heater and the steam inlet hole.
Optionally, the method further comprises:
one end of the waste water recovery tank is communicated with the steam outlet through a pipeline, and the other end of the waste water recovery tank is connected with the ultrapure water machine through a pipeline.
Optionally, the method further comprises:
the waste gas treatment bottle is provided with a cavity for storing alkaline solution and is communicated with the air outlet hole through a pipeline.
Compared with the prior art, the technical scheme of the utility model has the following advantages:
1. the utility model provides a steam oxidation and flue gas coal ash corrosion cooperative test system, which comprises the following components: a first tube, the inside of which is provided with a sample bracket, a boiler tube to be tested is placed on the sample bracket, and the outer wall of the boiler tube to be tested is coated with coal ash; the two first flanges are respectively arranged at two ends of the first pipe so as to seal the two ends of the first pipe, the first flange at one end is provided with an air inlet hole, and the first flange at the other end is provided with an air outlet hole; the two second flanges are respectively arranged at two ends of the boiler tube to be tested, which extend out of the two first flanges, so as to seal the boiler tube to be tested, steam inlet holes are arranged on the second flanges close to one end of the air inlet holes, and steam outlet holes are arranged on the second flanges close to one end of the air outlet holes; the flue gas prefabrication unit is communicated with the air inlet hole so as to introduce flue gas into the first pipe; the steam generation unit is communicated with the steam inlet hole so as to introduce steam into the boiler tube to be tested; according to the technical scheme, the high-temperature steam and the high-temperature flue gas are respectively introduced into the boiler tube to be tested and the first tube outside the boiler tube to be tested through the pipelines, so that the inner wall and the outer wall of the boiler tube to be tested are respectively exposed to the steam and the flue gas, and simultaneously, the performance test environment of steam oxidation and flue gas corrosion of the inner wall of the boiler tube to be tested is simulated and realized, and a good technical means is provided for evaluating the corrosion resistance of the candidate material of the heating surface of the coal-fired power plant boiler under the approximate working condition.
2. The utility model provides a steam oxidation and flue gas coal ash corrosion cooperative test system, which further comprises: the first heating furnace is sleeved on the periphery of the first pipe; the application adopts above-mentioned technical scheme, guarantees to carry out comprehensive evenly heating to first pipe.
3. The flue gas prefabrication unit comprises: the second pipe is provided with a cavity for storing the catalyst, and one end of the second pipe is communicated with the air inlet hole through a pipeline; the outlet of the air mixer is communicated with the other end of the second pipe; a plurality of gas cylinders connected in parallel, which are provided with different gases and are communicated with the inlet of the gas mixer; the second heating furnace is sleeved on the periphery of the second pipe; according to the technical scheme, various gases are mixed and are introduced into the second pipe to be catalyzed by the catalyst to form flue gas, and then the flue gas is introduced into the external space of the boiler pipe to be tested to simulate the environment of flue gas and coal ash corrosion outside the boiler.
4. The first heating furnace and the second heating furnace are split type cylindrical heating furnaces; the application adopts above-mentioned technical scheme, makes things convenient for the dismouting and the change of first pipe and second pipe.
5. The flue gas prefabrication unit of the utility model further comprises: a valve and a first mass flowmeter are respectively arranged between each gas storage bottle and the gas mixer; by adopting the technical scheme, the gas provided by each gas storage bottle is regulated according to the proportion of the components so as to prepare the flue gas in the gas mixing bottle.
6. The steam generating unit of the present utility model includes: the ultra-pure water machine, the water pump and the heater are connected in sequence; the heater is communicated with the steam inlet through a pipeline; by adopting the technical scheme, the water is heated and changed into steam, and the steam is introduced into the boiler tube to be tested so as to simulate the steam oxidation environment in the boiler.
7. The steam generating unit of the present utility model further includes: the water storage tank is arranged between the ultrapure water machine and the water pump; by adopting the technical scheme, a certain amount of water is stored in the water storage tank, so that sufficient steam is provided for the boiler tube to be tested.
8. The steam generating unit of the present utility model further includes: a valve and a second mass flowmeter arranged on the connecting pipeline of the heater and the steam inlet hole; by adopting the technical scheme, the steam flow in the boiler tube to be detected is conveniently controlled.
9. The utility model provides a steam oxidation and flue gas coal ash corrosion cooperative test system, which further comprises: one end of the waste water recovery tank is communicated with the steam outlet through a pipeline, and the other end of the waste water recovery tank is connected with the ultrapure water machine through a pipeline; the application adopts above-mentioned technical scheme, will utilize the steam recovery after, and steam condenses into water in the waste water recovery jar, circulates to the ultrapure water machine, recycles, water economy resource, reduce cost.
10. The utility model provides a steam oxidation and flue gas coal ash corrosion cooperative test system, which further comprises: the waste gas treatment bottle is provided with a cavity for storing alkaline solution and is communicated with the air outlet hole through a pipeline; by adopting the technical scheme, the alkaline solution is utilized to dissolve and dilute residual flue gas, so that the environment is protected.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a connection structure of a steam oxidation and flue gas soot corrosion cooperative test system according to an embodiment of the present utility model.
Reference numerals illustrate:
1. a first tube; 2. a first heating furnace; 3. a boiler tube to be tested; 4. a first flange; 5. a second flange; 6. a sample holder; 7. an air inlet hole; 8. an air outlet hole; 9. a steam inlet hole; 10. a steam outlet hole; 11. a gas cylinder; 12. a first mass flow meter; 13. an air mixer; 14. a second heating furnace; 15. a catalyst; 16. an ultrapure water machine; 17. a water storage tank; 18. a water pump; 19. a heater; 20. a second mass flow meter; 21. an exhaust gas treatment bottle; 22. a wastewater recovery tank; 23. and a second tube.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
An embodiment of a cooperative test system for steam oxidation and flue gas soot corrosion as shown in fig. 1 is used for simultaneously simulating service behaviors of an inner wall of a high-temperature heating surface of a coal-fired power plant boiler in a steam oxidation environment and service behaviors of an outer wall of the high-temperature heating surface of the coal-fired power plant boiler in a flue gas soot corrosion environment, and comprises the following steps: the reaction unit, the flue gas prefabrication unit, the steam generation unit, the tail gas treatment unit and the waste water recovery unit that are connected with the reaction unit.
The reaction unit includes: the boiler comprises a first pipe 1 horizontally arranged, two first flanges 4 respectively arranged at two ends of the first pipe 1, two second flanges 5 respectively arranged at two ends of a boiler pipe 3 to be tested, and a first heating furnace 2 sleeved on the periphery of the first pipe 1. A sample support 6 is arranged in the first tube 1, and specifically, the first tube 1 is a quartz tube or a corundum tube; a boiler tube 3 to be tested is placed on the sample support 6, and the outer wall of the boiler tube 3 to be tested is coated with coal ash; the two first flanges 4 seal the two ends of the first pipe 1, an air inlet hole 7 is arranged on the first flange 4 at one end, and an air outlet hole 8 is arranged on the first flange 4 at the other end. The two second flanges 5 are respectively arranged at two ends of the boiler tube 3 to be tested, which extend out of the two first flanges 4, so as to seal the boiler tube 3 to be tested, the second flange 5 near one end of the air inlet 7 is provided with an air inlet 9, and the second flange 5 near one end of the air outlet 8 is provided with an air outlet 10.
The flue gas prefabrication unit comprises: a second pipe 23 communicated with the air inlet hole 7, an air mixer 13 communicated with the second pipe 23, five gas cylinders 11 connected in parallel and communicated with the inlet of the air mixer 13, a second heating furnace 14 sleeved on the periphery of the second pipe 23, and a valve and a first mass flowmeter 12 arranged between each gas cylinder 11 and the air mixer 13. The second tube 23 has a cavity for storing the catalyst 15, in particular, the catalyst 15 is platinum; one end of the second pipe 23 is communicated with the air inlet 7 through a pipeline, the other end of the second pipe 23 is specifically communicated with the outlet of the air mixer 13, and the second pipe 23 is a quartz pipe or a corundum pipe; the five gas cylinders 11 connected in parallel are provided with different gases, and the different gases are respectively: nitrogen, oxygen, sulfur dioxide, hydrogen sulfide, and carbon dioxide; the catalyst 15 converts sulfur dioxide in the mixed gas into sulfur trioxide. Specifically, the first heating furnace 2 and the second heating furnace 14 are split type cylindrical heating furnaces.
The steam generation unit includes: the ultrapure water machine 16, the water storage tank 17, the water pump 18, the heater 19, the valve and the second mass flowmeter 20 are sequentially connected; the second mass flowmeter 20 is communicated with the steam inlet hole 9 through a pipeline, specifically, the water pump 18 is a peristaltic pump, and the second mass flowmeter 20 is a high-temperature mass flowmeter.
The wastewater recovery unit includes: a wastewater recovery tank 22; one end of the wastewater recovery tank 22 is communicated with the steam outlet 10 through a pipeline, and the other end is connected with the ultra-pure water machine 16 through a pipeline.
The exhaust gas treatment unit includes: two exhaust gas treatment bottles 21 connected in series; the exhaust gas treatment bottle 21 has a cavity for storing an alkaline solution and is communicated with the air outlet hole 8 through a pipeline.
The application of the steam oxidation and flue gas coal ash corrosion cooperative test system is briefly described as follows: firstly brushing coal ash on the outer wall of the boiler tube 3 to be tested according to test requirements, wherein the coal ash does not need to be brushed on the outer wall of the boiler tube 3 to be tested between the first flange 4 and the second flange 5; then the boiler tube 3 to be tested is put on the sample bracket 6 after passing through the first tube 1; the boiler tube 3 to be tested is connected with the first tube 1 in a sealing way through a first flange 4, and two ends of the boiler tube 3 to be tested are sealed through a second flange 5; the two first flanges 4 provided with the air inlet holes 7 and the air outlet holes 8 are respectively connected with a flue gas prefabricating unit and a tail gas treatment unit through pipelines; the two second flanges 5 provided with the steam inlet hole 9 and the steam outlet hole 10 are respectively connected with the steam generating unit and the wastewater recovery unit through pipelines to form a medium flow loop.
The valve connected with the first mass flowmeter 12 is regulated according to the component proportion to configure the flue gas, the flue gas which is uniformly mixed in the gas mixer 13 is introduced into the second heating furnace 14, sulfur dioxide in the flue gas is catalytically converted into sulfur trioxide through the catalyst 15, then the sulfur dioxide enters the first pipe 1 through the gas inlet 7 to react with the outer wall of the boiler pipe 3 to be tested coated with coal ash, and the residual flue gas enters the two-stage serial waste gas treatment bottle 21 through the gas outlet 8 to react with alkaline solution in the waste gas treatment bottle 21 and is converted into harmless salt.
Tap water is treated by the ultra-pure water machine 16, enters the water storage tank 17, is pumped into the heater 19 through the peristaltic pump, is heated by the heater 19, turns into steam, is recycled to the ultra-pure water machine 16 through the pipeline after being heated by the peristaltic pump, and is recycled by controlling the steam flow required by the test through the valve connected with the second mass flowmeter 20, enters the boiler tube 3 to be tested through the steam inlet hole 9, reacts with the inner wall of the boiler tube 3 to be tested, and is discharged into the wastewater recovery tank 22 through the steam outlet hole 10 to be condensed.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present utility model.
Claims (10)
1. A steam oxidation and flue gas soot corrosion cooperative test system, comprising:
a first tube (1) is internally provided with a sample support (6), a boiler tube (3) to be tested is placed on the sample support (6), and the outer wall of the boiler tube (3) to be tested is coated with coal ash;
the two first flanges (4) are respectively arranged at two ends of the first pipe (1) to seal the two ends of the first pipe (1), the first flange (4) at one end is provided with an air inlet hole (7), and the first flange (4) at the other end is provided with an air outlet hole (8);
the two second flanges (5) are respectively arranged at two ends of the boiler tube (3) to be tested, which extend out of the two first flanges (4) so as to seal the boiler tube (3) to be tested, the second flange (5) close to one end of the air inlet hole (7) is provided with an air inlet hole (9), and the second flange (5) close to one end of the air outlet hole (8) is provided with an air outlet hole (10);
the flue gas prefabrication unit is communicated with the air inlet hole (7) so as to introduce flue gas into the first pipe (1);
the steam generation unit is communicated with the steam inlet hole (9) so as to introduce steam into the boiler tube (3) to be tested.
2. The steam oxidation and flue gas soot corrosion cooperative test system according to claim 1, further comprising:
the first heating furnace (2) is sleeved on the periphery of the first pipe (1).
3. The steam oxidation and flue gas soot corrosion cooperative test system according to claim 2, wherein the flue gas prefabrication unit comprises:
a second pipe (23) having a cavity for storing the catalyst (15), one end of which is communicated with the air inlet hole (7) through a pipe;
an outlet of the air mixer (13) is communicated with the other end of the second pipe (23);
a plurality of gas cylinders (11) connected in parallel, which are provided with different gases and are communicated with the inlet of the gas mixer (13);
and a second heating furnace (14) which is sleeved on the outer periphery of the second pipe (23).
4. A steam oxidation and flue gas soot corrosion cooperative test system according to claim 3, wherein the first heating furnace (2) and the second heating furnace (14) are split type cylindrical heating furnaces.
5. A steam oxidation and flue gas soot corrosion cooperative test system according to claim 3, characterized in that a valve and a first mass flow meter (12) are provided between each gas cylinder (11) and the gas mixer (13), respectively.
6. The steam oxidation and flue gas soot corrosion cooperative test system according to claim 1, wherein the steam generation unit comprises:
an ultrapure water machine (16), a water pump (18) and a heater (19) which are connected in sequence;
the heater (19) is communicated with the steam inlet hole (9) through a pipeline.
7. The steam oxidation and flue gas soot corrosion cooperative test system according to claim 6, wherein the steam generation unit further comprises: a water storage tank (17) arranged between the ultra-pure water machine (16) and the water pump (18).
8. The steam oxidation and flue gas soot corrosion cooperative test system according to claim 6, wherein the steam generation unit further comprises: and a valve and a second mass flowmeter (20) which are arranged on the connecting pipeline of the heater (19) and the steam inlet (9).
9. The steam oxidation and flue gas soot corrosion cooperative test system according to claim 6, further comprising:
and one end of the wastewater recovery tank (22) is communicated with the steam outlet (10) through a pipeline, and the other end of the wastewater recovery tank is connected with the ultra-pure water machine (16) through a pipeline.
10. The steam oxidation and flue gas soot corrosion cooperative test system according to any one of claims 1 to 9, further comprising:
the waste gas treatment bottle (21) is provided with a cavity for storing alkaline solution and is communicated with the air outlet hole (8) through a pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222566119.8U CN219104672U (en) | 2022-09-27 | 2022-09-27 | Steam oxidation and flue gas coal ash corrosion cooperative test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222566119.8U CN219104672U (en) | 2022-09-27 | 2022-09-27 | Steam oxidation and flue gas coal ash corrosion cooperative test system |
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| Publication Number | Publication Date |
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| CN219104672U true CN219104672U (en) | 2023-05-30 |
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| CN202222566119.8U Active CN219104672U (en) | 2022-09-27 | 2022-09-27 | Steam oxidation and flue gas coal ash corrosion cooperative test system |
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| CN (1) | CN219104672U (en) |
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