CN110579315B - Heating furnace gas heat exchanger leak hunting device - Google Patents
Heating furnace gas heat exchanger leak hunting device Download PDFInfo
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- CN110579315B CN110579315B CN201910902704.0A CN201910902704A CN110579315B CN 110579315 B CN110579315 B CN 110579315B CN 201910902704 A CN201910902704 A CN 201910902704A CN 110579315 B CN110579315 B CN 110579315B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
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Abstract
The invention discloses a leakage detection device for a heating furnace gas heat exchanger, wherein a transition flue is arranged between a heating furnace flue and a chimney, a heat exchanger flue is arranged in the middle of the transition flue, and a first bypass flue and a second bypass flue are respectively arranged on two sides of the heat exchanger flue; the transition flue is also internally provided with a first gate plate capable of closing the inlets of the first bypass flue and the second bypass flue and a second gate plate capable of closing the outlets of the first bypass flue and the second bypass flue, the first gate plate and the second gate plate can move towards the middle part of the transition flue and respectively close the inlet and the outlet of the heat exchanger flue, and when the heat exchanger flue is closed, the first bypass flue and the second bypass flue are opened; a gas heat exchanger and a smoke component measuring point are arranged in the flue of the heat exchanger. The invention is not interfered by external factors, has accurate judgment and does not have the problem of misjudgment; the gas heat exchanger can be overhauled or replaced under the condition of not influencing smoke exhaust and gas supply, and the normal production of a production line is not influenced.
Description
Technical Field
The invention belongs to the field of metallurgical energy, and particularly relates to a leakage detection device for a heating furnace gas heat exchanger.
Background
In the production process of steel enterprises, steel rolling heating furnaces adopt mixed gas as fuel, in order to utilize the high-temperature flue gas waste heat discharged by the heating furnaces to the maximum extent, a gas heat exchanger is usually arranged behind an air heat exchanger, namely, the mixed gas is preheated by using medium-temperature flue gas at about 500 ℃ after air preheating so as to further recover the flue gas waste heat, and the low-temperature flue gas at 250-300 ℃ after heat exchange is discharged into the atmosphere through a chimney.
Gas heat exchangerThere is a certain risk in the actual application. Because the flue gas which is subjected to heat exchange by the gas heat exchanger is medium-low temperature flue gas, the flue gas contains a large amount of water vapor and carbon dioxide, and simultaneously contains a small amount of SO2，SO2The sulfuric acid steam reacts with the water vapor to produce sulfuric acid steam, and after the gas heat exchanger is used for a period of time, the low-temperature corrosion part formed by the sulfuric acid steam on a steel pipe of the gas heat exchanger is gradually enlarged, and finally, a hole is formed to cause gas leakage. If the gas leakage is not treated, a large amount of gas is directly discharged into the atmospheric environment through a chimney without entering a heating furnace for combustion, which is not only energy waste, but also pollutes the environment by gas components such as CO in the gas, and the gas discharged into the atmosphere causes operator poisoning if being light, and has explosion danger if being heavy.
The problem of leakage of the gas heat exchanger needs to be solved, and firstly, how to accurately judge whether the gas heat exchanger leaks or not. Misjudgment not only brings safety risk, but also influences normal production; secondly, if the heat exchanger is damaged and leaked, how to carry out rapid processing under the condition of not influencing production.
At present, the method for judging the leakage of the gas heat exchanger generally detects the combustible component change in the flue gas before and after passing through the gas heat exchanger. The judgment criterion is as follows: when the concentration of combustible components in the flue gas behind the heat exchanger is higher than that in the flue gas in front of the heat exchanger, the coal gas leaked from the coal gas heat exchanger is considered to enter the flue gas to cause the proportion of the combustible components in the flue gas to be increased, and the heat exchanger is damaged and leaked; when the combustible components in the flue gas behind the heat exchanger are equal to those in the flue gas in front of the heat exchanger, the state of the heat exchanger is considered to be normal. The method has great limitation in practical application, and has two main reasons: firstly, the flow of flue gas passing through a flue of a common hot rolling heating furnace reaches 7-10 ten thousand cubic meters per hour, and the leakage rate of a gas heat exchanger reaches 1000m3H, after leaked gas is diluted by high-flow flue gas, the content of combustible components reaches the ppm level, the combustible components generated by incomplete combustion of the gas in the flue gas from the front heating furnace are also in the ppm level, the concentration of the combustible components in front of and behind the heat exchanger is in one level, the difference is small, and judgment is madeInterference is greatly affected; and secondly, the problem of flue cold air dilution. Because the interior of the flue is in negative pressure operation, the flue is usually in a masonry structure, the sealing is difficult to achieve well, outside air can enter the flue through the untight sealing position, the total flue gas amount is increased after the sucked air and the flue gas are mixed, and the concentration of combustible components after the heat exchanger can be diluted and reduced. Even if the gas heat exchanger leaks, the concentration increase of combustible components caused by leakage and the concentration decrease of combustible components caused by air suction counteract each other, so that the concentration of combustible components before and after the heat exchanger is almost the same, even the concentration decreases, and the phenomenon that the heat exchanger does not leak is easily judged by mistake. In fact, the method has good application effect only when the gas heat exchanger has large leakage, for example, the leakage amount reaches more than 1 ten thousand cubic meters per hour, the concentration of combustible components before and after the heat exchanger can be obviously changed, but the whole system is in a dangerous situation at this time.
Maintenance or replacement of gas heat exchangers in the event of problems is also a problem. Because the temperature in the flue reaches 400-500 ℃, when the leakage of the gas heat exchanger is determined, a production plant must be shut down and cooled down to maintain or replace the gas heat exchanger, but the time from the shutdown and cooling of the heating furnace to the maintenance/replacement of the heat exchanger to the heating and starting of the furnace usually takes at least two days, and for a 24-hour uninterrupted production line, ten thousand tons of output is delayed, which is hardly accepted by hot rolling production organizations.
In summary, the prior art has the following three main problems:
(1) when the gas heat exchanger is damaged and leaked, a large amount of gas is directly discharged through a chimney without entering a heating furnace for combustion, so that huge energy waste is caused, the gas discharged into the atmosphere is light to cause poisoning of operators, and the explosion danger is generated.
(2) At present, the method for judging whether the gas heat exchanger leaks or not by detecting the concentration change of combustible components in the flue gas before and after passing through the gas heat exchanger has the possibility of misjudgment. The main reason is that the flue gas volume in the flue is large, the concentration of combustible components generated by incomplete combustion of coal gas in the flue gas from the front heating furnace and the concentration of combustible components in leaked and diluted coal gas are both in ppm level, the difference is small, and the judgment interference is large. Even if the heat exchanger leaks, the flue in negative pressure operation can suck a large amount of air from the outside atmosphere through the holes to dilute and reduce the concentration of combustible components behind the heat exchanger, the concentration increase of the combustible components caused by leakage and the concentration reduction of the combustible components caused by air suction are mutually offset, so that the phenomenon that the concentration of the combustible components is not much or even reduced around the heat exchanger occurs, the heat exchanger is easily judged incorrectly without leakage, and great potential safety hazards are brought.
(3) When the leakage of the gas heat exchanger is determined, the gas heat exchanger can be maintained or replaced only by shutting down the furnace and reducing the temperature, the shutdown time is long, and the yield of a hot rolling production line is influenced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a gas heat exchanger leakage detection device for a heating furnace, which can quickly and accurately detect the leakage of a gas heat exchanger on line and can also overhaul or replace the heat exchanger without influencing the production.
In order to achieve the aim, the invention designs a leakage detection device of a heating furnace gas heat exchanger, which is characterized in that: a transition flue is arranged between the heating furnace flue and the chimney, a heat exchanger flue is arranged in the middle of the transition flue, and a first bypass flue and a second bypass flue are respectively arranged on two sides of the heat exchanger flue; the transition flue is also internally provided with a first gate plate capable of closing the inlets of the first bypass flue and the second bypass flue and a second gate plate capable of closing the outlets of the first bypass flue and the second bypass flue, the first gate plate and the second gate plate can move towards the middle part of the transition flue and respectively close the inlet and the outlet of the heat exchanger flue, and when the heat exchanger flue is closed, the first bypass flue and the second bypass flue are opened; and a gas heat exchanger and a smoke component measuring point are arranged in the flue of the heat exchanger.
Preferably, the first bypass flue and the second bypass flue have the same width, and are half of the width of the heat exchanger flue.
Preferably, a confluence flue is arranged between the transition flue and the chimney.
Further preferably, the size of the confluence flue is the same as that of the heating furnace flue.
Preferably, the size of the heat exchanger flue is the same as that of the heating furnace flue.
Preferably, the smoke component measuring point is positioned in a heat exchanger flue between the gas heat exchanger and the second gate plate.
Preferably, the gas heat exchanger is provided with a gas inlet and a gas outlet, the gas inlet is provided with a gas inlet valve, and the gas outlet is provided with a gas outlet valve.
Preferably, a gas bypass pipeline is arranged between the gas inlet and the gas outlet; one end of the coal gas bypass pipeline is positioned in front of the inlet of the coal gas inlet valve, and the other end of the coal gas bypass pipeline is positioned behind the outlet of the coal gas outlet valve.
Still further preferably, a gas bypass valve is arranged on the gas bypass pipeline.
The invention has the beneficial effects that: after the front and rear flues are closed by the flue flashboards, as the dilution of large-flow flue gas is avoided, once the heat exchanger leaks, the combustible components in the flues of the heat exchanger inevitably rise rapidly, the concentration of the combustible components around the heat exchanger and the concentration of the combustible components in the flue gas from the heating furnace can differ by more than one order of magnitude, the interference of external factors is avoided, the leakage of the gas heat exchanger can be quickly judged, the judgment is accurate, and the problem of misjudgment is avoided; the invention can overhaul or replace the gas heat exchanger without affecting the smoke discharge and the gas supply, and does not affect the normal production of a production line.
Drawings
FIG. 1 is a schematic diagram of the present invention in normal operation
FIG. 2 is a schematic view of the invention during leak detection and inspection
FIG. 3 is a schematic view of a gas pipe of the gas heat exchanger of the present invention
In the figure: the device comprises a heating furnace 1, a heating furnace 2 flue, a heat exchanger 3 flue, a first flashboard 4, a first bypass flue 5, a second bypass flue 6, a gas inlet 7, a gas heat exchanger 8, a gas outlet 9, a second flashboard 10, a smoke component measuring point 11, a confluence flue 12, a chimney 13, a gas inlet valve 14, a gas outlet valve 15, a gas bypass valve 16 and a gas bypass pipeline 17.
Detailed Description
The technical solutions of the present invention (including the preferred ones) are further described in detail by way of fig. 1 to 3 and enumerating some alternative embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
As shown in fig. 1 and 2, in the leakage detecting device for the heating furnace gas heat exchanger designed by the invention, a transition flue is arranged between a heating furnace flue 2 and a chimney 13, a heat exchanger flue 3 is arranged in the middle of the transition flue, and a first bypass flue 5 and a second bypass flue 6 are respectively arranged on two sides of the heat exchanger flue 3; the transition flue is also internally provided with a first gate plate 4 capable of closing the inlets of the first bypass flue 5 and the second bypass flue 6 and a second gate plate 10 capable of closing the outlets of the first bypass flue 5 and the second bypass flue 6, the first gate plate 4 and the second gate plate 10 can move towards the middle part of the transition flue and respectively close the inlet and the outlet of the heat exchanger flue 3, and when the heat exchanger flue 3 is closed, the first bypass flue 5 and the second bypass flue 6 are opened; a gas heat exchanger 8 and a smoke component measuring point 11 are arranged in the heat exchanger flue 3.
As shown in fig. 3, the gas heat exchanger 8 is provided with a gas inlet 7 and a gas outlet 9, the gas inlet 7 is provided with a gas inlet valve 14, and the gas outlet is provided with a gas outlet valve 15. A gas bypass pipeline 17 is arranged between the gas inlet 7 and the gas outlet 8; one end of the coal gas bypass pipeline 17 is positioned in front of the inlet of the coal gas inlet valve, and the other end of the coal gas bypass pipeline is positioned behind the outlet of the coal gas outlet valve. A gas bypass valve 16 is arranged on the gas bypass pipeline 17.
Under normal conditions, as shown in fig. 1, high-temperature flue gas discharged from a heating furnace 1 enters a transition flue through a heating furnace flue 2, at the moment, a first bypass flue 5 and a second bypass flue 6 are blocked by a first gate plate 4 and a second gate plate 10, the high-temperature flue gas enters a heat exchanger flue 3, enters a confluence flue 12 through a gas heat exchanger 8 and then is discharged into the atmosphere from a chimney 13. Coal gas enters the coal gas heat exchanger 8 from the coal gas inlet 9 to exchange heat with high-temperature flue gas, and then is supplied to the heating furnace 1 from the coal gas outlet 9 for use.
When the heat exchanger is subjected to leak detection, as shown in fig. 2 and 3, the first shutter plate 4 and the second shutter plate 10 are respectively moved towards the middle to be closed, so that flues in front of and behind the gas heat exchanger 3 are in a closed state, and the first bypass flues 5 and the second bypass flues 6 on two sides are in an open state. High-temperature flue gas discharged by the heating furnace 1 enters a first bypass flue 5 and a second bypass flue 6 at two sides of a heat exchanger flue 3 through a heating furnace flue 2, then enters a confluence flue 12 and is discharged into the atmosphere from a chimney 13. The coal gas enters the coal gas heat exchanger 8 from the coal gas inlet 9 and is supplied to the heating furnace 1 from the coal gas outlet 9 for use. At this time, the combustible component concentration at the smoke component measuring point 11 is observed:
if the concentration of the combustible components is reduced or not changed, the gas heat exchanger can be judged to be not leaked. The first flashboard 4 and the second flashboard 10 are respectively moved to two sides to block the first bypass flue 5 and the second bypass flue 6 at two sides of the heat exchanger flue 8, and the system is restored to the state under the normal operation condition;
if the concentration of combustible components at the smoke component measuring point 11 rises rapidly, the leakage of the gas heat exchanger 8 can be judged; cutting off the gas inlet valve 14 and the gas outlet valve 15, and opening a gas bypass valve 16 on a gas bypass pipe 17; the gas heat exchanger 8 is repaired or replaced.
Preferably, the first bypass flue 5 and the second bypass flue 6 have the same width and are half the width of the heat exchanger flue 3.
Preferably, a confluence flue 12 is arranged between the transition flue and the chimney 13. The size of the confluence flue 12 is the same as that of the heating furnace flue 2.
Preferably, the size of the heat exchanger flue 3 is the same as the size of the heating furnace flue 2.
Preferably, a flue gas composition measuring point 11 is located in the heat exchanger flue 3 between the gas heat exchanger 8 and the second shutter 10.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and any modification, combination, replacement, or improvement made within the spirit and principle of the present invention is included in the scope of the present invention.
Claims (9)
1. The utility model provides a heating furnace gas heat exchanger leak hunting device which characterized in that: a transition flue is arranged between the heating furnace flue and the chimney, a heat exchanger flue is arranged in the middle of the transition flue, and a first bypass flue and a second bypass flue are respectively arranged on two sides of the heat exchanger flue; the transition flue is also internally provided with a first gate plate capable of closing the inlets of the first bypass flue and the second bypass flue and a second gate plate capable of closing the outlets of the first bypass flue and the second bypass flue, the first gate plate and the second gate plate can move towards the middle part of the transition flue and respectively close the inlet and the outlet of the heat exchanger flue, and when the heat exchanger flue is closed, the first bypass flue and the second bypass flue are opened; a gas heat exchanger and a smoke component measuring point are arranged in the heat exchanger flue; when the heat exchanger carries out leak detection, the heat exchanger flue is in a closed state: if the concentration of combustible components at the smoke component measuring point is reduced or not changed, judging that the gas heat exchanger does not leak; and (4) judging the leakage of the gas heat exchanger if the concentration of combustible components at the smoke component measuring point rises rapidly.
2. The heating furnace gas heat exchanger leak detection device according to claim 1, characterized in that: the first bypass flue and the second bypass flue are the same in width and are half of the width of the heat exchanger flue.
3. The heating furnace gas heat exchanger leak detection device according to claim 1, characterized in that: and a confluence flue is arranged between the transition flue and the chimney.
4. The heating furnace gas heat exchanger leak detection device according to claim 3, characterized in that: the size of the confluence flue is the same as that of the heating furnace flue.
5. A heating furnace gas heat exchanger leak detection device according to claim 1 or 2, characterized in that: the size of the heat exchanger flue is the same as that of the heating furnace flue.
6. The heating furnace gas heat exchanger leak detection device according to claim 1, characterized in that: and the smoke component measuring point is positioned in a heat exchanger flue between the gas heat exchanger and the second flashboard.
7. The heating furnace gas heat exchanger leak detection device according to claim 1, characterized in that: the gas heat exchanger is provided with a gas inlet and a gas outlet, the gas inlet is provided with a gas inlet valve, and the gas outlet is provided with a gas outlet valve.
8. The heating furnace gas heat exchanger leak detection device according to claim 7, characterized in that: a gas bypass pipeline is arranged between the gas inlet and the gas outlet; one end of the coal gas bypass pipeline is positioned in front of the inlet of the coal gas inlet valve, and the other end of the coal gas bypass pipeline is positioned behind the outlet of the coal gas outlet valve.
9. The heating furnace gas heat exchanger leak detection device according to claim 8, characterized in that: and a coal gas bypass valve is arranged on the coal gas bypass pipeline.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910902704.0A CN110579315B (en) | 2019-09-23 | 2019-09-23 | Heating furnace gas heat exchanger leak hunting device |
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| CN201910902704.0A CN110579315B (en) | 2019-09-23 | 2019-09-23 | Heating furnace gas heat exchanger leak hunting device |
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| CN110579315B true CN110579315B (en) | 2021-08-17 |
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| CN111693222B (en) * | 2020-05-08 | 2022-08-26 | 中国船舶重工集团公司第七二五研究所 | Helium mass spectrum leak detection method for detecting sealing performance of printed plate heat exchanger |
| CN112150772B (en) * | 2020-09-24 | 2022-05-03 | 深圳市启蒙智慧医疗科技有限公司 | Gas weighing system, method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2745015Y (en) * | 2004-11-09 | 2005-12-07 | 丁永健 | Flue gas residual heat utilization apparatus for industrial furnaces |
| CN101813422A (en) * | 2009-02-19 | 2010-08-25 | 中国石油化工集团公司 | Waste heat recovery system of petrochemical heating furnace |
| CN202119273U (en) * | 2011-05-16 | 2012-01-18 | 厦门高谱科技有限公司 | Comprehensive utilization device of flue gas waste heat of heating furnace |
| CN102620569B (en) * | 2012-03-09 | 2013-03-13 | 唐山京兆科技开发有限公司 | Resource cyclic utilization system of industrial kiln |
| CN104807027B (en) * | 2014-01-28 | 2018-09-07 | 北京华晟环能科技有限公司 | The recovery system of flue residue heat |
| CN108087861A (en) * | 2017-12-22 | 2018-05-29 | 芜湖德司节能科技有限公司 | A kind of boiler afterheat combined reclamation method |
| CN108489290A (en) * | 2018-05-21 | 2018-09-04 | 北京航天石化技术装备工程有限公司 | A kind of high-temperature flue gas residual neat recovering system |
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