CN114184037B - 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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- CN114184037B CN114184037B CN202111337355.6A CN202111337355A CN114184037B CN 114184037 B CN114184037 B CN 114184037B CN 202111337355 A CN202111337355 A CN 202111337355A CN 114184037 B CN114184037 B CN 114184037B
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- 239000001257 hydrogen Substances 0.000 title claims abstract description 86
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 86
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000011156 evaluation Methods 0.000 claims abstract description 16
- 238000012360 testing method Methods 0.000 claims abstract description 6
- 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 10
- 230000000630 rising effect Effects 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 150000002431 hydrogen Chemical class 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 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
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
Landscapes
- 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 influence of each chimney state evaluation on the hydrogen leakage phenomenon, adjusting the influence of the auxiliary exhaust evaluation on the hydrogen content of a furnace mouth, adjusting the influence of the gas curtain lifting evaluation on the hydrogen leakage at different heights, changing the stop valve evaluation on the hydrogen leakage, and testing the influence of different chimney leakage amounts on the hydrogen leakage; next, improvement was performed on the mesh belt furnace in combination with the evaluation result. The auxiliary collecting and exhausting device of the inlet and the outlet can influence the airflow direction in the furnace, is unfavorable for discharging hydrogen from a chimney port and is closed or removed. When the auxiliary discharge of the inlet and outlet chimney is required to be opened to a certain amount, the inlet and outlet can be ensured not to be dissipated, and when the air inflow of the hydrogen is increased, the auxiliary discharge is increased, namely the auxiliary discharge is required to be adjustable. Because the furnace is overlong, the length of the air curtain needs to be increased, and no hydrogen leakage from the inlet and the outlet can be ensured. The height and the inner diameter of the main ignition chimney are increased, so that larger drawing force is formed, and the dissipation amount of hydrogen is small.
Description
Technical Field
The invention relates to the technical field of mesh belt furnaces, in particular to an improved method for preventing hydrogen leakage of a mesh belt furnace.
Background
In the current production process of the mesh belt furnace, hydrogen leakage is unavoidable, and the safety of the production site is seriously endangered. Therefore, research on the influencing factors of hydrogen leakage is urgently needed, and reasonable solutions are provided through research.
The initial equipment parameters of the mesh belt furnace are as follows:
network bandwidth: 300mm
Effective height: 140mm
Number of warm areas: 8 pieces of
Belt speed: 30-200mm/min
Experiment belt speed: 100mm/min
Sintering atmosphere: nitrogen-hydrogen mixed atmosphere
Total length of equipment: 8000mm
Nitrogen inlet pressure: 0.4MPa
Hydrogen intake 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 improves the problem of hydrogen leakage.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the improved method is applied to the mesh belt furnace, an inlet collecting auxiliary chimney and an inlet main ignition chimney are arranged at the inlet of the mesh belt furnace along the heat treatment direction, an outlet main ignition chimney and an outlet collecting auxiliary chimney are arranged at the outlet, and a first auxiliary exhaust and a second auxiliary exhaust are respectively arranged at the inlet main ignition chimney and the outlet main ignition chimney; the improvement method comprises the following steps:
step one, adjusting influence factor evaluation in a mesh belt furnace structure to influence a hydrogen leakage phenomenon, wherein the influence factor evaluation specifically comprises the following steps:
a, adjusting the influence of each chimney state evaluation on the hydrogen leakage phenomenon;
b, adjusting the auxiliary exhaust to evaluate the influence of the auxiliary exhaust on the hydrogen content of the furnace mouth;
c, adjusting the air curtain to lift different heights to evaluate the influence on hydrogen leakage;
d, replacing a stop valve to evaluate the influence on hydrogen leakage;
e, testing and evaluating the influence on hydrogen leakage by different chimney leakage amounts;
and step two, carrying out improvement on 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 auxiliary collecting and exhausting device of the inlet and the outlet can influence the airflow direction in the furnace, is unfavorable for discharging hydrogen from a chimney port and is closed or removed.
2. When the auxiliary discharge of the inlet and outlet chimney is required to be opened to a certain amount, the inlet and outlet can be ensured not to be dissipated, and when the air inflow of the hydrogen is increased, the auxiliary discharge is increased, namely the auxiliary discharge is required to be adjustable.
3. Because the furnace is overlong, the length of the air curtain needs to be increased, and no hydrogen leakage from the inlet and the outlet can be ensured.
4. Through theoretical calculation, the height and the inner diameter of the main ignition chimney are increased, larger drawing force is formed, and the dissipation amount of hydrogen is small.
Drawings
FIG. 1 is a schematic diagram of an outlet main ignition chimney closed, an inlet main ignition chimney open, and a collection auxiliary chimney at an inlet and an outlet.
FIG. 2 is a schematic diagram of only opening the inlet main ignition chimney and all the others closed.
FIG. 3 is a schematic diagram of the opening of the inlet and outlet main ignition chimney and the rest of the closing.
FIG. 4 is a schematic diagram of an open only inlet primary ignition chimney.
FIG. 5 is a schematic diagram of the outlet main ignition chimney with additional auxiliary exhaust and then the inlet and outlet main ignition chimneys are all open.
FIG. 6 is a schematic diagram showing the hydrogen leakage content of the inlet and outlet when the air curtain is lifted to different heights.
Fig. 7 is a schematic diagram of a chimney with all the stop valves at each chimney changed to ball valves and only the main ignition chimney opened.
Fig. 8 is a schematic diagram showing that all the stop valves at the chimney are changed into ball valves, and all the inlet and outlet chimneys are opened.
Fig. 9 shows that all the stop valves at the chimney are changed into ball valves, the inlet and outlet chimneys are all opened, and the auxiliary exhaust is regulated to a certain amount.
FIG. 10 is a schematic diagram of various stack 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 the outlet collects an auxiliary chimney.
Detailed Description
The inlet of the mesh belt furnace along the heat treatment direction is provided with an inlet collecting auxiliary chimney 1 and an inlet main ignition chimney 2, the outlet is provided with an outlet main ignition chimney 3 and an outlet collecting auxiliary chimney 4, and the inlet main ignition chimney 2 and the outlet main ignition chimney 3 are respectively provided with a first auxiliary exhaust and a second auxiliary exhaust.
The invention relates to an improvement method for preventing hydrogen leakage, which comprises the following steps:
firstly, adjusting influence factors in a mesh belt furnace structure to evaluate influence on a hydrogen leakage phenomenon, wherein the influence factors specifically comprise:
and a, adjusting the influence of each chimney state evaluation 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 air curtain to lift at different heights to evaluate the influence on hydrogen leakage.
And d, evaluating the influence on hydrogen leakage by replacing the stop valve.
e, testing and evaluating the influence on hydrogen leakage by different chimney leakage amounts.
The hydrogen detector used in the test is a portable detector with a measuring range of 0-4500ppm.
The following steps are detailed respectively:
referring to fig. 1-3, the specific process of adjusting the influence of each chimney state evaluation on the hydrogen leakage phenomenon is as follows:
a) The outlet main ignition chimney is closed, the inlet main ignition chimney, the inlet collection auxiliary chimney and the outlet collection auxiliary chimney are opened, and through detection, the hydrogen content at the inlet furnace tube and the outlet furnace tube is high, the rising speed is high, and more hydrogen can escape from the furnace mouth.
b) Only the inlet main ignition chimney is opened, all other chimneys are closed, the hydrogen content of the outlet furnace tube is the same as that in the step a), but the hydrogen content at the inlet furnace tube and the outlet furnace tube is lower than that in the step a), and the rising speed is slower, so that the hydrogen can escape from the furnace mouth less than when the inlet and outlet collection auxiliary chimneys are opened.
c) And c, opening the inlet and outlet main ignition chimney, and closing the rest, wherein the hydrogen content at the inlet and outlet furnace tubes is lower than that in the step a), but the rising speed is slower than that when only the inlet main ignition chimney is opened.
Referring to fig. 4-5, the specific process of adjusting the auxiliary exhaust to evaluate the effect on the hydrogen content of the furnace mouth is as follows:
a) Only the inlet main ignition chimney is opened, the air inflow of the first auxiliary exhaust is gradually increased, when the air inflow reaches a certain amount, the furnace mouth completely has no hydrogen dissipation, and the nitrogen curtain at the furnace mouth is in an outward exhaust state.
b) The inlet and outlet main ignition chimney is opened, the air inflow of the first auxiliary exhaust and the second auxiliary exhaust is gradually increased, when the air inflow reaches a certain amount, the furnace mouth is completely free from hydrogen dissipation, and at the moment, the inlet and outlet air curtain nitrogen is in an outward exhaust state.
c) And gradually increasing the hydrogen air inflow, and when detecting that the inlet and the outlet have no hydrogen leakage, each hydrogen air inflow needs certain auxiliary discharge.
Referring to fig. 6, the specific process of adjusting the air curtain to lift different heights to evaluate the influence on the hydrogen leakage is as follows: under the condition that the furnace mouth air curtain is longer, the air curtain is lifted to different heights, and part of the air curtain is kept to fall vertically, and when the total inlet of hydrogen is detected to be a certain amount, the content of the inlet and outlet hydrogen is detected to be zero.
Referring to fig. 7-9, the specific procedure for evaluating the influence of the replacement of the shut-off valve on the hydrogen leakage is as follows:
a) All the stop valves at the chimney are changed into ball valves, and only the main ignition chimney is opened.
b) All the stop valves at the chimney are changed into ball valves, and the inlet and outlet chimneys are opened.
c) All the stop valves at the chimney are changed into ball valves, the inlet and outlet chimneys are all opened, and the auxiliary exhaust is regulated to a certain amount.
After the check valve is changed into the ball valve, the check valve has no influence on the dissipation condition of the furnace mouth, namely the withdrawal force of the chimney is not changed, and the furnace mouth can not be dissipated when the auxiliary exhaust is opened to a certain amount.
Referring to fig. 10, the specific process of evaluating the influence of different chimney leakage amounts on hydrogen leakage is as follows: only the main ignition chimney is opened, and the detection shows that the dissipation of the furnace inlet and the furnace outlet is larger than that of the main ignition chimney only is opened.
Based on the evaluation results of fig. 1-10, the invention improves the hydrogen leakage prevention of the mesh belt furnace, and the specific improvement process is as follows:
a) The auxiliary collection chimney at the inlet and the outlet can influence the airflow direction in the furnace, is unfavorable for discharging hydrogen from the chimney mouth, and is closed or removed.
b) Because the length of the furnace is too long, the length of the air curtain needs to be increased, and the inlet and the outlet can be ensured to be free from hydrogen leakage.
c) When the auxiliary discharge of the inlet and outlet chimney is required to be opened to a certain amount, the inlet and outlet can be ensured not to be dissipated, and when the air inflow of the hydrogen is increased, the auxiliary discharge is increased, namely the auxiliary discharge is required to be adjustable.
d) The height and the inner diameter of the main ignition chimney are increased, so that larger drawing force is formed, and the dissipation amount of hydrogen is reduced.
The foregoing is merely illustrative and explanatory of the principles of the invention, as various modifications and additions may be made to the specific embodiments described, or similar thereto, by those skilled in the art, without departing from the principles of the invention or beyond the scope of the appended claims.
Claims (1)
1. The improved method for preventing hydrogen leakage of the mesh belt furnace is applied to the mesh belt furnace and is characterized in that an inlet of the mesh belt furnace along the heat treatment direction is provided with an inlet collecting auxiliary chimney (1) and an inlet main ignition chimney (2), an outlet is provided with an outlet main ignition chimney (3) and an outlet collecting auxiliary chimney (4), and the inlet main ignition chimney (2) and the outlet main ignition chimney (3) are respectively provided with a first auxiliary exhaust and a second auxiliary exhaust; the improvement method comprises the following steps:
step 1, adjusting influence factor evaluation in a mesh belt furnace structure to influence a hydrogen leakage phenomenon, wherein the influence factor evaluation specifically comprises the following steps:
1.1, adjusting the influence of each chimney state evaluation on the hydrogen leakage phenomenon, wherein the specific process is as follows:
1.1.1 closing an outlet main ignition chimney, opening an inlet main ignition chimney, an inlet collection auxiliary chimney and an outlet collection auxiliary chimney, and detecting to ensure that the hydrogen content at an inlet furnace tube and an outlet furnace tube is high and the rising speed is high, so that more hydrogen escapes from the furnace mouth;
1.1.2, only opening an inlet main ignition chimney, closing all other chimneys, and taking the hydrogen content of an outlet furnace tube as the same as that in the step 1.1.1, wherein the hydrogen content at the inlet furnace tube and the outlet furnace tube is lower than that in the step 1.1.1, and the rising speed is slower, so that the hydrogen can escape from the furnace mouth less than that when an inlet and outlet collection auxiliary chimney is opened;
1.1.3 opening an inlet main ignition chimney and an outlet main ignition chimney, and closing the rest, wherein the hydrogen content at the inlet furnace tube and the outlet furnace tube is lower than that in the step 1.1.1, but the rising speed is slower than that when only the inlet main ignition chimney is opened;
1.2, adjusting the auxiliary exhaust to evaluate the influence of the auxiliary exhaust on the hydrogen content of the furnace mouth, wherein the specific process is as follows:
1.2.1 only opening an inlet main ignition chimney, gradually increasing the air inflow of the first auxiliary exhaust, and when the air inflow reaches a certain amount, completely preventing hydrogen from escaping from the furnace mouth, wherein the nitrogen curtain of the furnace mouth is in an outward exhaust state;
1.2.2 the main ignition chimney at the inlet and the outlet is opened, the air inflow of the first auxiliary exhaust and the second auxiliary exhaust is gradually increased, when the air inflow reaches a certain amount, the furnace mouth completely has no hydrogen dissipation, and at the moment, the nitrogen at the inlet and the outlet is in an outward exhaust state;
1.2.3 gradually increasing the hydrogen air inflow, and when detecting that no hydrogen leaks at the inlet and the outlet, each hydrogen air inflow needs a certain auxiliary discharge amount;
1.3, adjusting the air curtain to lift different heights to evaluate the influence on hydrogen leakage, wherein the specific process is as follows:
under the condition that the furnace mouth air curtain is longer, the air curtains are lifted to different heights, partial air curtains are kept to fall vertically, and when the total hydrogen gas inlet is detected to be a certain amount, the content of the hydrogen gas at the inlet and the outlet is detected to be zero;
1.4, evaluating the influence on hydrogen leakage by replacing a stop valve, wherein the specific process is as follows:
1.4.1, all the stop valves at the chimney parts are changed into ball valves, and only the main ignition chimney is opened;
1.4.2, all the stop valves at the chimney parts are changed into ball valves, and the inlet and outlet chimneys are opened;
1.4.3, all the stop valves at the chimney parts are changed into ball valves, the inlet and outlet chimneys are opened, and the auxiliary discharge is regulated to a certain amount;
after the check valve is changed into the ball valve, the check valve has no influence on the dissipation condition of the furnace mouth, namely the withdrawal force of the chimney is not changed, and the furnace mouth can not be dissipated when the auxiliary exhaust is opened to a certain amount;
1.5, testing and evaluating the influence on hydrogen leakage by different chimney leakage amounts, wherein the specific process is as follows:
only the main ignition chimney at the outlet is opened, and the detection shows that the dissipation of the furnace inlet and the furnace outlet is larger than that of the main ignition chimney at the inlet;
step 2, the evaluation result of the step 1 is combined to improve the mesh belt furnace, and the specific improvement process is as follows:
2.1, the auxiliary collection chimney at the inlet and the outlet can influence the airflow direction in the furnace, is unfavorable for discharging hydrogen from the chimney port and is required to be closed or removed;
2.2, because the length of the furnace is too long, the length of the air curtain needs to be increased, and no hydrogen leakage at the inlet and the outlet can be ensured;
2.3, when the auxiliary discharge of the chimney at the inlet and the outlet is required to be opened to a certain amount, the inlet and the outlet can be ensured to be free from hydrogen dissipation, and when the air inflow of the hydrogen is increased, the auxiliary discharge is increased, namely the auxiliary discharge is required to be adjustable;
2.4, the height and the inner diameter of the main ignition chimney are increased, so that larger drawing force is formed, and the dissipation amount of hydrogen is reduced.
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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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| CN114184037B true CN114184037B (en) | 2023-11-17 |
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