CN114184037A - Improved method for preventing hydrogen leakage of mesh belt furnace - Google Patents
Improved method for preventing hydrogen leakage of mesh belt furnace Download PDFInfo
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- CN114184037A CN114184037A CN202111337355.6A CN202111337355A CN114184037A CN 114184037 A CN114184037 A CN 114184037A CN 202111337355 A CN202111337355 A CN 202111337355A CN 114184037 A CN114184037 A CN 114184037A
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 93
- 239000001257 hydrogen Substances 0.000 title claims abstract description 93
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000007789 gas Substances 0.000 claims abstract description 11
- 238000012360 testing method Methods 0.000 claims abstract description 8
- 238000011156 evaluation Methods 0.000 claims abstract description 6
- 230000009286 beneficial effect Effects 0.000 claims abstract description 5
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 5
- 238000007599 discharging Methods 0.000 claims abstract description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 230000000630 rising effect Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 4
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 7
- 238000007792 addition Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/40—Arrangements of controlling or monitoring devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B2009/3072—Balancing the pressure between the upper part and the lower part of the kiln, above and under the track
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
An improved method for preventing hydrogen leakage of a mesh belt furnace relates to the technical field of mesh belt furnaces. Firstly, adjusting the state of each chimney to evaluate the influence on the hydrogen leakage phenomenon, adjusting the emission-aiding evaluation to evaluate the influence on the hydrogen content of a furnace mouth, adjusting the lifting of a gas curtain to different heights to evaluate the influence on the hydrogen leakage, replacing a stop valve to evaluate the influence on the hydrogen leakage, and testing and evaluating the influence on the hydrogen leakage by different chimney leakage amounts; secondly, the improvement is carried out on the mesh belt furnace by combining the evaluation result. The inlet and outlet auxiliary collecting and exhausting devices can influence the airflow direction in the furnace, are not beneficial to discharging hydrogen from the chimney opening and are required to be closed or removed. The inlet and outlet chimney auxiliary exhaust can ensure that no hydrogen is dissipated at the inlet and outlet when the inlet and outlet chimney auxiliary exhaust is required to be opened to a certain amount, and the auxiliary exhaust amount is increased when the hydrogen air inflow is increased, namely the auxiliary exhaust is required to be adjustable. Because the furnace is too long, the length of the gas curtain needs to be increased, and no hydrogen leakage exists at the inlet and the outlet. The height and the inner diameter of the main ignition chimney are increased to form larger drawing force, and the hydrogen dissipation amount is less.
Description
Technical Field
The invention relates to the technical field of mesh belt furnaces, in particular to an improvement method for preventing hydrogen leakage of a mesh belt furnace.
Background
In the current mesh belt furnace production process, hydrogen leakage is inevitable, and the production field safety is seriously endangered. Therefore, research on the influence factors of hydrogen leakage is urgently needed, and a reasonable solution is provided through the research.
The parameters of the initial equipment of the mesh belt furnace are as follows:
width of mesh belt: 300mm
Effective height: 140mm
The number of temperature zones is as follows: 8 are provided with
The belt speed is as follows: 30-200mm/min
The speed of the test belt: 100mm/min
Sintering atmosphere: mixed atmosphere of nitrogen and hydrogen
The total length of the equipment is as follows: 8000mm
Nitrogen gas inlet pressure: 0.4MPa
Hydrogen gas inlet pressure: 0.2MPa
And (3) ignition: 4 chimneys have normal ignition function and other functions
Taking the mesh belt furnace as an example, the invention provides an improved method for preventing hydrogen leakage of the mesh belt furnace, and the problem of hydrogen leakage is solved.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an improved method for preventing hydrogen leakage of a mesh belt furnace, which is used for improving the problem of hydrogen leakage.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an improved method for preventing hydrogen leakage of a mesh belt furnace is applied to the mesh belt furnace, an inlet collection auxiliary chimney and an inlet main ignition chimney are arranged at an inlet of the mesh belt furnace along a heat treatment direction, an outlet main ignition chimney and an outlet collection auxiliary chimney are arranged at an outlet, and the inlet main ignition chimney and the outlet main ignition chimney are respectively provided with an auxiliary exhaust 1 and an auxiliary exhaust 2; the improved method comprises the following steps:
step one, adjusting influence factors in the structure of the mesh belt furnace to evaluate the influence on the hydrogen leakage phenomenon, specifically:
adjusting the state of each chimney to evaluate the influence on the hydrogen leakage phenomenon;
b, adjusting the auxiliary exhaust to evaluate the influence of the auxiliary exhaust on the hydrogen content at the furnace mouth;
c, adjusting the lifting of the air curtain to different heights to evaluate the influence on the hydrogen leakage;
d, replacing the stop valve to evaluate the influence on hydrogen leakage;
e, testing and evaluating the leakage amount of different chimneys to influence the hydrogen leakage;
and step two, improving the mesh belt furnace by combining the evaluation result of the step one.
Compared with the prior art, the invention has the beneficial effects that:
1. the inlet and outlet auxiliary collecting and exhausting devices can influence the airflow direction in the furnace, are not beneficial to discharging hydrogen from the chimney opening and are required to be closed or removed.
2. The inlet and outlet chimney auxiliary exhaust can ensure that no hydrogen is dissipated at the inlet and outlet when the inlet and outlet chimney auxiliary exhaust is required to be opened to a certain amount, and the auxiliary exhaust amount is increased when the hydrogen air inflow is increased, namely the auxiliary exhaust is required to be adjustable.
3. Because the furnace is too long, the length of the gas curtain needs to be increased, and no hydrogen leakage exists at the inlet and the outlet.
4. Through theoretical calculation, the height and the inner diameter of the main ignition chimney are increased, a larger drawing force is formed, and the hydrogen dissipation amount is less.
Drawings
FIG. 1 is a schematic view of an outlet primary ignition chimney closed, an inlet primary ignition chimney opened and a collection auxiliary chimney at the inlet and outlet.
FIG. 2 is a schematic diagram showing only the inlet primary ignition stack being open, and the remainder being fully closed.
Fig. 3 is a schematic diagram of opening the inlet and outlet main ignition chimney and closing the rest.
FIG. 4 is a schematic view of the primary ignition stack only being open.
FIG. 5 is a schematic diagram of the addition of boost to the outlet main ignition chimney followed by the opening of the outlet main ignition chimney.
FIG. 6 is a schematic diagram of the hydrogen leakage content at the inlet and outlet of the air curtain at different heights.
FIG. 7 is a schematic diagram of the main ignition chimney only being opened by changing all the stop valves at each chimney into ball valves.
Fig. 8 is a schematic diagram that all the stop valves at each chimney are changed into ball valves, and the inlet and outlet chimneys are opened.
FIG. 9 shows that all the stop valves at the chimneys are changed into ball valves, the inlet and outlet chimneys are opened, and the auxiliary exhaust is adjusted to a certain amount.
FIG. 10 is a schematic diagram of different chimney leakage tests.
In the figure:
1. an inlet collection auxiliary chimney; 2. an inlet main ignition chimney; 3. an outlet main ignition chimney; 4. and an outlet collects an auxiliary chimney.
Detailed Description
An inlet collection auxiliary chimney 1 and an inlet main ignition chimney 2 are arranged at the inlet of the mesh belt furnace along the heat treatment direction, an outlet main ignition chimney 3 and an outlet collection auxiliary chimney 4 are arranged at the outlet, and the inlet main ignition chimney 2 and the outlet main ignition chimney 3 are respectively provided with an auxiliary exhaust 1 and an auxiliary exhaust 2.
The invention relates to an improved method for preventing hydrogen leakage, which comprises the following steps:
firstly, influence factors in the structure of the mesh belt furnace are adjusted to evaluate the influence on the hydrogen leakage phenomenon, and the method specifically comprises the following steps:
and a, adjusting the state of each chimney to evaluate the influence on the hydrogen leakage phenomenon.
And b, adjusting the auxiliary exhaust to evaluate the influence of the auxiliary exhaust on the hydrogen content of the furnace mouth.
And c, adjusting the lifting height of the air curtain to evaluate the influence on the hydrogen leakage.
And d, replacing the stop valve to evaluate the leakage influence on the hydrogen.
And e, testing and evaluating the leakage amount of different chimneys to influence the hydrogen leakage.
The hydrogen detector used in the test is a portable detector, and the measuring range is 0-4500 ppm.
Each step is described in detail below:
referring to fig. 1-3, the specific process for adjusting the chimney status to evaluate the effect on the hydrogen leakage phenomenon includes:
a) and (3) closing the outlet main ignition chimney, and opening the inlet main ignition chimney, the inlet collection auxiliary chimney and the outlet collection auxiliary chimney, wherein the hydrogen content at the inlet and outlet furnace tubes is high and the rising speed is high through detection, which shows that more hydrogen is diffused from the furnace mouth.
b) And (b) only opening the inlet main ignition chimney, completely closing the other chimneys, and keeping the hydrogen content of the outlet furnace tube the same as that in the step a), but the hydrogen content at the inlet and outlet furnace tubes is lower than that in the step a), and the rising speed is lower, which indicates that the hydrogen is less released from the furnace mouth than the opening time of the inlet and outlet collection auxiliary chimneys.
c) Opening the inlet and outlet main ignition chimney, closing the rest, and making the hydrogen content at the inlet and outlet furnace tubes lower than that in the step a), but the rising speed is slower than that of the inlet main ignition chimney.
Referring to fig. 4-5, the specific process of adjusting the emission-aiding evaluation on the hydrogen content at the furnace mouth is as follows:
a) only the inlet main ignition chimney is opened, the air input of the auxiliary exhaust 1 is gradually increased, when the air quantity reaches a certain quantity, no hydrogen is dissipated at the furnace mouth, and the nitrogen gas curtain at the furnace mouth is in an outward exhaust state.
b) And opening the inlet and outlet main ignition chimney, gradually increasing the air inflow of the auxiliary exhaust 1 and the auxiliary exhaust 2, and when the air flow reaches a certain amount, completely preventing hydrogen from dissipating at the furnace mouth, and at the moment, the inlet and outlet air curtains discharge nitrogen to the outside.
c) The hydrogen gas inflow is gradually increased, and when no hydrogen leakage exists at the inlet and the outlet, the hydrogen gas inflow needs a certain displacement assistance amount.
Referring to fig. 6, the specific process for estimating the influence on hydrogen leakage by adjusting the lifting height of the air curtain is as follows: and under the condition that the furnace mouth gas curtain is longer, the gas curtain is lifted to different heights, a part of the gas curtain is kept to fall vertically, and the content of the hydrogen at the inlet and the outlet is zero when the total intake of the hydrogen is a certain amount.
Referring to fig. 7-9, the specific process of replacing the stop valve to evaluate the effect on hydrogen leakage is as follows:
a) all the stop valves at the chimneys are changed into ball valves, and only the main ignition chimney is opened.
b) All the stop valves at the chimneys are changed into ball valves, and the inlet and outlet chimneys are opened.
c) All the stop valves at the chimneys are changed into ball valves, the inlet and outlet chimneys are opened, and the discharge-assisting function is adjusted to a certain amount.
The check shows that after the stop valve is replaced by the ball valve, the dissipation condition of the furnace mouth is not influenced, namely the drawing force of the chimney is not changed, and the auxiliary exhaust also needs to be opened to a certain amount to ensure that the furnace mouth does not dissipate.
Referring to fig. 10, the specific process of testing and evaluating the hydrogen leakage by using different chimney leakage amounts includes: only the outlet main ignition chimney is opened, and the detection shows that the dissipation amount of the inlet and outlet furnace mouth is larger than that of the inlet main ignition chimney.
Based on the evaluation results of the above figures 1-10, the invention improves the hydrogen leakage prevention of the mesh belt furnace, and the specific improvement process is as follows:
a) the inlet and outlet auxiliary collecting chimney can influence the airflow direction in the furnace, is not beneficial to discharging hydrogen from the chimney opening and needs to be closed or removed.
b) Because the length of the furnace is too long, the length of the gas curtain needs to be increased, and no hydrogen leakage exists at the inlet and the outlet.
c) The inlet and outlet chimney auxiliary exhaust can ensure that no hydrogen is dissipated at the inlet and outlet when the inlet and outlet chimney auxiliary exhaust is required to be opened to a certain amount, and the auxiliary exhaust amount is increased when the hydrogen air inflow is increased, namely the auxiliary exhaust is required to be adjustable.
d) The height and the inner diameter of the main ignition chimney are increased to form larger drawing force and reduce the hydrogen dissipation amount.
The foregoing is merely exemplary and illustrative of the principles of the present invention and various modifications, additions and substitutions of the specific embodiments described herein may be made by those skilled in the art without departing from the principles of the present invention or exceeding the scope of the claims set forth herein.
Claims (7)
1. An improved method for preventing hydrogen leakage of a mesh belt furnace is applied to the mesh belt furnace and is characterized in that an inlet collection auxiliary chimney (1) and an inlet main ignition chimney (2) are arranged at an inlet of the mesh belt furnace along a heat treatment direction, an outlet main ignition chimney (3) and an outlet collection auxiliary chimney (4) are arranged at an outlet, and the inlet main ignition chimney (2) and the outlet main ignition chimney (3) are respectively provided with an auxiliary exhaust 1 and an auxiliary exhaust 2; the improved method comprises the following steps:
step one, adjusting influence factors in the structure of the mesh belt furnace to evaluate the influence on the hydrogen leakage phenomenon, specifically:
adjusting the state of each chimney to evaluate the influence on the hydrogen leakage phenomenon;
b, adjusting the auxiliary exhaust to evaluate the influence of the auxiliary exhaust on the hydrogen content at the furnace mouth;
c, adjusting the lifting of the air curtain to different heights to evaluate the influence on the hydrogen leakage;
d, replacing the stop valve to evaluate the influence on hydrogen leakage;
e, testing and evaluating the leakage amount of different chimneys to influence the hydrogen leakage;
and step two, improving the mesh belt furnace by combining the evaluation result of the step one.
2. The improvement method for preventing hydrogen leakage of the mesh belt furnace according to claim 1, characterized in that the specific process of the step a is as follows:
a) closing the outlet main ignition chimney, and opening the inlet main ignition chimney, the inlet collection auxiliary chimney and the outlet collection auxiliary chimney, wherein the hydrogen content at the inlet and outlet furnace tubes is high and the rising speed is high through detection, which indicates that more hydrogen escapes from the furnace mouth;
b) only opening the inlet main ignition chimney, closing all the other chimneys, and keeping the hydrogen content of the outlet furnace tube the same as that in the step a), but keeping the hydrogen content at the inlet and outlet furnace tubes lower than that in the step a), and the rising speed is slower, which indicates that the hydrogen is less released from the furnace mouth than the opening time of the inlet and outlet collection auxiliary chimneys;
c) opening the inlet and outlet main ignition chimney, closing the rest, and making the hydrogen content at the inlet and outlet furnace tubes lower than that in the step a), but the rising speed is slower than that of the inlet main ignition chimney.
3. The improvement method for preventing hydrogen leakage of the mesh belt furnace according to claim 2, characterized in that the specific process of the step b is as follows:
a) only opening an inlet main ignition chimney, gradually increasing the air inflow of the auxiliary exhaust 1, when the air flow reaches a certain amount, completely preventing hydrogen from dissipating at the furnace mouth, and enabling a nitrogen gas curtain at the furnace mouth to be in an outward discharge state;
b) opening the inlet and outlet main ignition chimney, gradually increasing the air inflow of the auxiliary exhaust 1 and the auxiliary exhaust 2, when the air flow reaches a certain amount, no hydrogen is dissipated at the furnace mouth, and at the moment, the inlet and outlet air curtains discharge nitrogen gas in an outward state;
c) the hydrogen gas inflow is gradually increased, and when no hydrogen leakage exists at the inlet and the outlet, the hydrogen gas inflow needs a certain displacement assistance amount.
4. The improvement method for preventing hydrogen leakage of the mesh belt furnace according to claim 3, characterized in that the specific process of the step c is as follows: and under the condition that the furnace mouth gas curtain is longer, the gas curtain is lifted to different heights, a part of the gas curtain is kept to fall vertically, and the content of the hydrogen at the inlet and the outlet is zero when the total intake of the hydrogen is a certain amount.
5. The improvement method for preventing hydrogen leakage of the mesh belt furnace according to claim 4, characterized in that the specific process of the step d is as follows:
a) all the stop valves at each chimney are changed into ball valves, and only the main ignition chimney is started;
b) all the stop valves at the chimneys are changed into ball valves, and the inlet and outlet chimneys are opened;
c) all the stop valves at the chimneys are changed into ball valves, the inlet and outlet chimneys are opened, and the discharge assistance is adjusted to a certain amount;
the check shows that after the stop valve is replaced by the ball valve, the dissipation condition of the furnace mouth is not influenced, namely the drawing force of the chimney is not changed, and the auxiliary exhaust also needs to be opened to a certain amount to ensure that the furnace mouth does not dissipate.
6. The improvement method for preventing hydrogen leakage of the mesh belt furnace according to claim 5, characterized in that the specific process of the step e is as follows: only the outlet main ignition chimney is opened, and the detection shows that the dissipation amount of the inlet and outlet furnace mouth is larger than that of the inlet main ignition chimney.
7. The improvement method for preventing the hydrogen leakage of the mesh belt furnace as claimed in claim 6, wherein the specific improvement process of the second step is as follows:
a) the inlet and outlet auxiliary collection chimney can influence the airflow direction in the furnace, is not beneficial to discharging hydrogen from the chimney port and needs to be closed or removed;
b) because the length of the furnace is too long, the length of the gas curtain needs to be increased, and no hydrogen leakage exists at an inlet and an outlet;
c) when the exhaust assistance of the inlet and outlet chimneys is required to be opened to a certain amount, the inlet and outlet can be ensured not to be dissipated by hydrogen, and the exhaust assistance amount is increased when the hydrogen air inflow is increased, namely the exhaust assistance is required to be adjustable;
d) the height and the inner diameter of the main ignition chimney are increased to form larger drawing force and reduce the hydrogen dissipation amount.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111337355.6A CN114184037B (en) | 2021-11-12 | 2021-11-12 | Improved method for preventing hydrogen leakage of mesh belt furnace |
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| CN202111337355.6A CN114184037B (en) | 2021-11-12 | 2021-11-12 | Improved method for preventing hydrogen leakage of mesh belt furnace |
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