CN110967147B - Online searching method for damaged radiant tube of annealing furnace - Google Patents
Online searching method for damaged radiant tube of annealing furnace Download PDFInfo
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- CN110967147B CN110967147B CN201811138417.9A CN201811138417A CN110967147B CN 110967147 B CN110967147 B CN 110967147B CN 201811138417 A CN201811138417 A CN 201811138417A CN 110967147 B CN110967147 B CN 110967147B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses an online searching method for damaged radiant tubes of an annealing furnace, which comprises the following steps of 1: whether the opening of the pressure control baffle is smaller than or equal to the lower limit early warning value or not is judged, if yes, the step 2 is executed, and if not, the step 7 is executed; step 2: whether the nitrogen injection amount is larger than or equal to the upper limit early warning value or not is judged, if yes, the step 3 is executed, and if not, the step 7 is executed; and step 3: the radiant tube burns, and the waste gas fan operates to keep the negative pressure in the radiant tube; and 4, step 4: observing the temperature value of the waste gas after combustion in each section of the annealing furnace, and listing the radiant tube with the temperature value of the waste gas close to or exceeding the early warning value as a key detection object; and 5: whether the oxygen content value of the waste gas in the radiant tube is less than 20.5 percent or not, if yes, executing the step 6, and if not, returning to the step 4; step 6: when the oxygen content value is less than 20.5 percent, the radiant tube is damaged, and emergency treatment measures are taken; and 7: and finishing the search. The method can rapidly and accurately judge the damaged radiant tube on line under the heating state of the annealing furnace without stopping the machine, and take emergency treatment measures to the damaged radiant tube in time.
Description
Technical Field
The invention relates to cold rolling annealing equipment, in particular to an online searching method for a damaged radiant tube of an annealing furnace.
Background
The heating equipment of the annealing furnace of the cold rolling continuous annealing unit adopts a radiant tube for heating, and simultaneously, hydrogen-nitrogen mixed gas is injected into the annealing furnace, wherein the concentration of hydrogen is between 3 and 50 percent, and the hydrogen is used for brightening the surface of a steel strip. The working principle of the radiant tube is as follows: combustion-supporting air is conveyed into the radiant tube through the pipeline by an air fan, fuel gas is conveyed into the radiant tube through a gas pipeline, mixed gas of air and gas is ignited by an ignition device, burnt waste gas is extracted by a waste gas fan, and heat generated in the process is radiated to the steel strip through the radiant tube to be heated.
Because the annealing furnace of the continuous annealing unit is in a high-temperature heating state for a long time and is subjected to a rapid temperature rise and drop process, the radiant tube is easy to damage and cause leakage of the radiant tube. The leakage of the radiant tube causes a reduction in heating efficiency and an increase in gas consumption. The main method for judging the quality of the radiant tube at present is to enter an annealing furnace chamber after the furnace is shut down after fixed maintenance and flameout, and the temperature in the furnace chamber is reduced to be below 40 ℃, to check the surface and the appearance of the radiant tube one by one, and to replace the damaged radiant tube with a new radiant tube, the method for checking the damage of the radiant tube adopted at present has the following defects:
1. it cannot be determined on-line which radiant tube of the annealing furnace is damaged.
2. Because the damage can not be found in time, the damaged radiant tube can not be treated by emergency treatment in the first time, and the radiant tube can only be searched and confirmed one by one when the fixed repair annealing furnace is flamed out and cooled to the room temperature (less than 40 ℃) after entering the furnace hearth of the annealing furnace.
3. Referring to the attached figure 1, the upper and lower radiant tubes 1 are installed in the furnace body 2 and positioned at the top and the bottom of the furnace body 2, the steel plate is positioned between the upper and lower radiant tubes 1, and because dead angles exist at the positions between the upper and lower radiant tubes 1 and the top and bottom of the furnace body 2, blind areas 3 exist when the furnace enters the furnace for surface and appearance inspection, the damaged parts are not easy to be found and identified.
4. The opening degree of the damaged radiant tube in the heating state and the flameout state of the annealing furnace becomes smaller, particularly, when the radiant tube has cracks, the cracks of the radiant tube are closed under the flameout state (the furnace temperature is reduced to be less than or equal to 300 ℃), and the radiant tube is difficult to be found after being checked in the annealing furnace.
The invention patent with Chinese patent number ZL 201010117264.7 discloses a method for rapidly detecting leakage of radiant tubes of a roller-hearth type non-oxidation furnace in batches, wherein a sealing gasket matched with a flange is made of a asbestos pad and an anti-explosion sheet is made of a white iron sheet according to the shape size of the flange opening at the joint of a burner body and a waste gas tube; after the temperature in the furnace is reduced to room temperature, the waste gas pipe of each burner is disassembled, the manufactured sealing gasket and the explosion-proof sheet are arranged between the burner flange and the waste gas pipe flange, and the bolt is screwed down; opening a combustion-supporting fan to enable each burner to be in an ignition state, and keeping the pressure of a combustion-supporting air pipeline system to be kept at 6 +/-0.5 KPa; and (4) allowing a detector to enter the furnace, brushing each part of each radiant tube with soapy water, and constantly paying attention to whether bubbles emerge from the brushed part, wherein if yes, the radiant tube has an air leakage point. The invention can effectively, conveniently and quickly detect the leakage of the roller hearth type non-oxidation furnace radiant tube which is numerous and has tiny damaged and broken points and can not be effectively detected by naked eyes. The inspection method still needs to stop the furnace until the temperature in the furnace is reduced to room temperature, and personnel enter each furnace to inspect, and can not quickly judge and find out damaged radiant tubes on line.
Disclosure of Invention
The invention aims to provide an online searching method for damaged radiant tubes of an annealing furnace, which can quickly and accurately judge the damaged radiant tubes on line under the conditions of no shutdown and heating of the annealing furnace, is convenient for taking emergency measures for the damaged radiant tubes, reduces the consumption of fuel and provides quantitative data support for overhauling and replacing the radiant tubes at the first time.
The invention is realized by the following steps:
an online searching method for a damaged radiant tube of an annealing furnace comprises the following steps:
step 1: when the nitrogen gas is injected into the chamber QNitrogen is present inWhen the opening degree of the pressure control baffle in the hearth is kept unchanged, judging whether the opening degree of the pressure control baffle in the hearth is smaller than or equal to a lower limit early warning value or not, if so, executing the step 2, and if not, executing the step 7;
step 2: when the opening of the pressure control baffle in the hearth is kept to be larger than or equal to 40%, judging whether the nitrogen injection amount is larger than or equal to an upper limit early warning value, if so, executing the step 3, and if not, executing the step 7;
and step 3: the radiant tube of the annealing furnace keeps a combustion heating state, and the waste gas fan always runs to keep the negative pressure in the radiant tube;
and 4, step 4: observing the temperature value of the waste gas after combustion in the waste gas combustion pipeline of each section of the annealing furnace, and listing the radiant tube with the waste gas temperature value close to or exceeding the early warning value as a key detection object;
and 5: judging the oxygen content O of the exhaust gas in the detected radiant tube2Whether the% is less than 20.5%, if yes, executing the step 6, and if not, returning to the step 4;
step 6: judging that the radiant tube with the oxygen content value less than 20.5% is damaged, and adopting emergency treatment measures to repair the radiant tube;
and 7: and finishing the search.
The opening lower limit early warning value of the pressure control baffle is 35%.
The upper limit early warning value of the nitrogen injection amount is QNitrogen is present inX 1.2 times.
The early warning value of the exhaust gas temperature is 550 ℃.
In the step 4, the method further comprises the following sub-steps:
step 4.1: closing an ignition gas cut-off valve and a main gas cut-off valve of the radiant tube, and stopping the supply of the fuel gas to the radiant tube;
step 4.2: connecting a flue gas analyzer to a combustion waste gas sampling valve of a combustion waste gas pipeline through a hose, opening the combustion waste gas sampling valve and reading a waste gas oxygen content value detected by the flue gas analyzer;
step 4.3: closing the combustion waste gas sampling valve, and slowly opening an ignition gas cut-off valve and a main gas cut-off valve of the radiant tube to finish the detection of the radiant tube of one section;
step 4.4: and returning to the step 4.1 to detect the radiant tube of the next section until the radiant tubes of all the sections are searched.
In the step 5 and the step 6, when the oxygen content value O of the exhaust gas is2Judging that the radiant tube is intact when the percentage is more than or equal to 20.5 percent; when the oxygen content value is less than or equal to 18 percent, the oxygen content value O2When the percentage is less than 20.5 percent, judging that the radiant tube is slightly damaged; when the oxygen content value is less than or equal to 16 percent, the oxygen content value O2When the percentage is less than 18 percent, judging that the radiant tube is moderately damaged; when the oxygen content value O2When the percentage is less than 16 percent, judging that the radiant tube is seriously damaged.
In step 6, the emergency repair method of the radiant tube comprises the following steps: and (4) carrying out blind plate plugging on the combustion waste gas pipeline of the damaged radiant tube.
Compared with the prior art, the invention has the following beneficial effects:
1. in the application of the continuous annealing unit, the damaged radiant tube can be very quickly identified by depending on accurate detection data, and people do not need to enter a hearth of a limited space for inspection after the furnace is stopped.
2. The time for checking and judging the damage condition of the radiant tube can be controlled to be finished within 2 hours, the operation time for entering the furnace chamber for confirmation during the fixed maintenance is saved, the accuracy rate for distinguishing the damage condition of the radiant tube is improved through data identification, and meanwhile, the potential safety hazard in the operation of entering the furnace chamber is reduced.
The method can rapidly and accurately judge the damaged radiant tube on line under the heating state of the annealing furnace without stopping the machine, thereby taking emergency treatment measures to the damaged radiant tube in time, reducing the consumption of fuel and providing quantitative data support for the overhauling and replacement of the radiant tube at the first time. The invention can be widely applied to cold rolling continuous annealing units and has wider popularization value.
Drawings
FIG. 1 is a view showing an installation structure of a radiant tube in a prior art annealing furnace;
FIG. 2 is a schematic diagram of an on-line method for finding a damaged radiant tube in an annealing furnace according to the present invention;
FIG. 3 is a flow chart of the method for on-line searching for damaged radiant tubes in an annealing furnace according to the present invention.
In the figure, 1 radiant tube, 2 furnace bodies, 3 blind zones, a V1 main gas cut-off valve, a V2 ignition gas cut-off valve, a V3 combustion waste gas sampling valve, 4 flue gas analyzers, 5 hoses and 6 combustion waste gas pipelines.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 2, in a normal state, main gas is connected to the radiant tube 1 through a main gas cutoff valve V1, ignition gas is connected to one end of the radiant tube 1 through an ignition gas cutoff valve V2, a combustion exhaust gas pipe 6 is connected to the other end of the radiant tube 1, and a combustion exhaust gas sampling valve V3 is installed on the combustion exhaust gas pipe 6. When the radiant tube 1 of the annealing furnace is not broken, the pressure in the hearth and the amount of nitrogen injected into the furnace form balance, the opening of the pressure control baffle in the hearth of the annealing furnace is kept between 40 and 100 percent, the temperature of waste gas after fuel combustion in the radiant tube 1 is kept between 400 and 550 ℃, and the flow of the nitrogen injected into the furnace is basically constant at QNitrogen is present inm3/h。
Referring to fig. 3, an online searching method for damaged radiant tubes of an annealing furnace includes the following steps:
step 1: when the nitrogen gas is injected into the chamber QNitrogen is present inAnd (3) judging whether the opening degree of the pressure control baffle in the hearth is smaller than or equal to the lower limit early warning value or not when the opening degree is kept unchanged, if so, executing the step 2, and if not, executing the step 7. Preferably, the lower opening limit early warning value of the pressure control baffle is 35%.
Step 2: and when the opening of the pressure control baffle in the hearth is kept to be more than or equal to 40%, judging whether the nitrogen injection amount is more than or equal to the upper limit early warning value, if so, executing the step 3, and if not, executing the step 7. Preferably, the upper limit early warning value of the nitrogen injection amount is QNitrogen is present inX is 1.2 times (m)3/h)。
And step 3: the radiant tube 1 of the annealing furnace keeps a burning heating state, and the waste gas fan always runs to keep the negative pressure in the radiant tube 1.
And 4, step 4: and (3) observing the temperature value of the waste gas after combustion in the combustion waste gas pipeline 6 of each section of the annealing furnace, and taking the radiant tube 1 row with the waste gas temperature value close to or exceeding the early warning value as a key detection object, wherein the detection method comprises the following steps. Preferably, the early warning value for the exhaust gas temperature is 550 ℃.
Step 4.1: the ignition gas shutoff valve V2 and the main gas shutoff valve V1 of the radiant tube 1 are closed, and the supply of the gas fuel into the radiant tube 1 is stopped.
Step 4.2: the flue gas analyzer 4 is connected to a combustion exhaust gas sampling valve V3 of the combustion exhaust gas pipe 6 through a hose 5, the combustion exhaust gas sampling valve V3 is opened and the exhaust gas oxygen content value detected by the flue gas analyzer 4 is read. Preferably, the smoke analyzer 4 can be a TESTO 340 smoke analyzer of a certain brand.
Step 4.3: and closing the combustion waste gas sampling valve V3, and slowly opening the main gas cut-off valve V1 and the ignition gas cut-off valve V2 of the radiant tube 1 to finish the detection of the radiant tube 1 of one section.
Step 4.4: and returning to the step 4.1 to detect the radiant tube 1 in the next section until the radiant tubes 1 in all the sections are searched.
And 5: judging the oxygen content O of the exhaust gas in the radiant tube 1 to be detected2And whether the% is less than 20.5%, if yes, executing the step 6, and if not, returning to the step 4.
Stopping at the radiant tube 1When the fuel is supplied, the combustion is stopped, and only air is left in the radiant tube 1, and the theoretical oxygen content in the radiant tube 1 is equal to or more than 20.5 percent. Therefore, when the oxygen content value O of the exhaust gas is2When the percentage is more than or equal to 20.5 percent, the radiant tube 1 is judged to be intact.
Step 6: the radiant tube 1 with the oxygen content value less than 20.5 percent is judged to be damaged, emergency treatment measures are adopted to repair the radiant tube 1, and the damaged radiant tube 1 can be replaced and taken off the aircraft during the next periodic maintenance. Preferably, the combustion exhaust gas duct 6 of the damaged radiant tube 1 can be blind plugged.
When radiant tube 1 stops fuel supply and appears the breakage, under the effect of exhaust fan, be the negative pressure in radiant tube 1, can inhale the nitrogen hydrogen in the annealing stove in radiant tube 1, dilute the combustion air's in radiant tube 1 volume, because the difference of damaged degree, finally lead to the decline of the interior oxygen content of radiant tube 1. Therefore, the degree of breakage of the radiant tube 1 is determined from the change in the oxygen content of the radiant tube 1 as follows:
i) when the oxygen content value is less than or equal to 18 percent, the oxygen content value O2When% is less than 20.5%, the radiant tube 1 is judged to be slightly broken.
ii) when the oxygen content value O is more than or equal to 16 percent2When% is less than 18%, it is judged that the radiant tube 1 is damaged moderately.
iii) when the oxygen content value O2When the percentage is less than 16%, the radiant tube 1 is judged to be seriously damaged.
And 7: and finishing the search.
Example (b):
when a certain continuous annealing unit normally produces, the opening of the furnace pressure control baffle of the annealing furnace is found to be reduced from 45 percent to 17 percent to 35 percent, and the nitrogen injection quantity in the annealing furnace is QNitrogen is present in=950m3H rises to 1210m3H is QNitrogen is present in1.27 times > 1.2 times. The annealing furnace keeps a heating state, and the waste gas fan keeps running; the combustion exhaust gas temperature of the annealing furnace 3# section reaches 620 ℃, and the normal value is 550 ℃ at most.
The ignition gas cut-off valve V2 and the main gas cut-off valve V1 of the radiant tube 1 are closed, the supply of the fuel gas into the radiant tube 1 is stopped, the flue gas analyzer 4 is connected to the combustion waste gas sampling valve V3 of the combustion waste gas pipeline 6 through the hose 5, the switches of the combustion waste gas sampling valve V3 and the flue gas analyzer 4 are opened, the sampling is carried out, the reading is read, and then the combustion waste gas sampling valve V3 is closed. Then slowly opening a main gas cut-off valve V1 and an ignition gas cut-off valve V2; the radiant tubes 1 of the annealing furnace 3# section were inspected one by one in accordance with the above-described operation.
In the detection, the oxygen content of the gas in the radiant tube 1 with the number of 3-W-08 is found to be 6.2 percent to less than 20.5 percent, and the radiant tube 1 is judged to be damaged and seriously damaged. Emergency treatment measures are taken for the 3-W-08 radiant tube 1, a combustion waste gas pipeline 6 of the radiant tube 1 can be plugged by a blind plate, and the 3-W-08 radiant tube 1 is directly replaced by a new one during regular maintenance.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An online searching method for a damaged radiant tube of an annealing furnace is characterized by comprising the following steps: the method comprises the following steps:
step 1: when the nitrogen gas is injected into the chamber QNitrogen is present inWhen the opening degree of the pressure control baffle in the hearth is kept unchanged, judging whether the opening degree of the pressure control baffle in the hearth is smaller than or equal to a lower limit early warning value or not, if so, executing the step 2, and if not, executing the step 7;
step 2: increasing the nitrogen injection amount in the annealing furnace, judging whether the nitrogen injection amount is larger than or equal to an upper limit early warning value or not when the opening of the pressure control baffle in the hearth is kept to be larger than or equal to 40%, if so, executing the step 3, and if not, executing the step 7;
and step 3: the radiant tube (1) of the annealing furnace keeps a combustion heating state, and the waste gas fan always runs to keep negative pressure in the radiant tube (1);
and 4, step 4: observing the temperature value of the waste gas after combustion in the combustion waste gas pipeline (6) of each section of the annealing furnace, and listing the radiant tube (1) with the waste gas temperature value close to or exceeding the early warning value as a key detection object;
in the step 4, the method further comprises the following sub-steps:
step 4.1: closing an ignition gas cut-off valve V2 and a main gas cut-off valve V1 of the radiant tube (1) and stopping the supply of the fuel gas into the radiant tube (1);
step 4.2: connecting the flue gas analyzer (4) to a combustion waste gas sampling valve V3 of a combustion waste gas pipeline (6) through a hose (5), opening the combustion waste gas sampling valve V3 and reading the oxygen content value of the waste gas detected by the flue gas analyzer (4);
step 4.3: closing the combustion waste gas sampling valve V3, and slowly opening an ignition gas cut-off valve V2 and a main gas cut-off valve V1 of the radiant tube (1) to finish the detection of the radiant tube (1) in one section;
step 4.4: returning to the step 4.1 to detect the radiant tube (1) in the next section until the radiant tubes (1) in all the sections are searched;
and 5: judging the oxygen content value O of the exhaust gas in the detected radiant tube (1)2Whether the% is less than 20.5%, if yes, executing the step 6, and if not, returning to the step 4;
step 6: judging that the radiant tube (1) with the oxygen content value less than 20.5% is damaged, and adopting emergency treatment measures to repair the radiant tube (1);
and 7: and finishing the search.
2. The method for on-line searching damaged radiant tube in an annealing furnace as claimed in claim 1, wherein: the opening lower limit early warning value of the pressure control baffle is 35%.
3. The method for on-line searching damaged radiant tube in an annealing furnace as claimed in claim 1, wherein: the upper limit early warning value of the nitrogen injection amount is QNitrogen is present inX 1.2 times.
4. The method for on-line searching damaged radiant tube in an annealing furnace as claimed in claim 1, wherein: the early warning value of the exhaust gas temperature is 550 ℃.
5. The method for on-line searching damaged radiant tube in an annealing furnace as claimed in claim 1, wherein: in the step 5 and the step 6, when the oxygen content value O of the exhaust gas is2When the percentage is more than or equal to 20.5 percent, judging that the radiant tube (1) is intact; when the oxygen content value is less than or equal to 18 percent, the oxygen content value O2When the percentage is less than 20.5 percent, judging that the radiant tube (1) is slightly damaged; when the oxygen content value is less than or equal to 16 percent, the oxygen content value O2When the percentage is less than 18 percent, judging the medium damage of the radiant tube (1); when the oxygen content value O2When the percentage is less than 16%, the radiant tube (1) is judged to be seriously damaged.
6. The method for on-line searching damaged radiant tube in an annealing furnace as claimed in claim 1, wherein: in the step 6, the emergency repair method of the radiant tube (1) comprises the following steps: and (3) plugging the combustion waste gas pipeline (6) of the damaged radiant tube (1) by a blind plate.
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| CN112213462A (en) * | 2020-08-31 | 2021-01-12 | 首钢京唐钢铁联合有限责任公司 | Method for detecting cracking condition of radiant tube of annealing furnace |
| CN113358299A (en) * | 2021-05-13 | 2021-09-07 | 武汉钢铁有限公司 | Rapid detection method for breakage of radiant tube of cold rolling continuous annealing furnace |
| CN113390571B (en) * | 2021-06-23 | 2022-04-26 | 宝武集团鄂城钢铁有限公司 | Method for efficiently and online checking cracking of non-oxidation furnace radiant tube |
| CN115902118A (en) * | 2022-12-18 | 2023-04-04 | 本钢板材股份有限公司 | Method for detecting cracking of radiant tube of annealing furnace |
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