CN216845732U - Double-heat-storage intelligent diagnosis combustion system - Google Patents
Double-heat-storage intelligent diagnosis combustion system Download PDFInfo
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- CN216845732U CN216845732U CN202220426511.XU CN202220426511U CN216845732U CN 216845732 U CN216845732 U CN 216845732U CN 202220426511 U CN202220426511 U CN 202220426511U CN 216845732 U CN216845732 U CN 216845732U
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Abstract
The utility model relates to a two heat accumulation intelligent diagnosis combustion system belongs to ferrous metallurgy combustion system technical field. The system comprises a coal gas heat storage system and an air heat storage system, wherein the coal gas heat storage system comprises a coal gas main pipe, a plurality of coal gas branch pipes and a coal smoke branch pipe which are arranged in parallel; the gas main pipe is connected with the gas branch pipe and the soot branch pipe through a gas three-way reversing valve; the air heat storage system comprises an air main pipe, a plurality of air branch pipes and an air smoke branch pipe which are arranged in parallel; the air main pipe is connected with the air branch pipe and the hollow cigarette pipe through an air three-way reversing valve; a flow detection device and a component detection device are arranged on the gas main pipe; a second flow detection device is arranged on the air main pipe; and the gas branch pipe and the air branch pipe are provided with detection equipment. And the problems in the operation process can be found in time through various detection devices on the device, and the device can be overhauled.
Description
Technical Field
The utility model belongs to the technical field of ferrous metallurgy combustion system, a two heat accumulation intelligent diagnosis combustion system is related to.
Background
China is a large steel production country, the steel yield is the first world for many years, a steel rolling heating furnace is important equipment and a large energy consumption household in a steel production hot rolling process, the steel rolling heating furnace generally adopts the self-produced gas of a steel mill as fuel, the heating furnace adopts a double heat storage combustion mode and can directly use low-calorific-value fuel such as blast furnace gas and the like, the high-efficiency utilization of the gas of the steel mill can be realized, and the double heat storage heating furnace is widely applied to the steel mill in recent years, so that better energy-saving and emission-reducing effects are achieved. However, the double-heat-storage combustion also has some problems, such as the excessive content of CO in flue gas, the excessive temperature of exhaust gas, the damage of a heat accumulator and the like, and because the conventional system design and control method is difficult to accurately judge the problems of the combustion system in advance, the daily maintenance of the system and equipment cannot follow up, the shutdown treatment is often needed when the problems are exposed, and the reasons are often difficult to accurately find out, so that the production is influenced, and the maintenance cost is high.
Therefore, how to enable the double-heat-storage heating furnace to find the problems in the operation process in time and accurately find the reasons, the problems can be quickly and efficiently solved by an operator, the service life of equipment is prolonged, the production continuity is ensured to the maximum extent, and the problems are in urgent need of solution. With the development of intelligent informatization, it is increasingly important to mine, analyze, and solve problems by production data.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a two heat accumulation intelligent diagnosis combustion system can in time discover the problem that appears in the operation process to overhaul the processing.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a double-heat-storage intelligent diagnosis combustion system comprises a coal gas heat storage system and an air heat storage system, wherein the coal gas heat storage system comprises a coal gas main pipe, a plurality of coal gas branch pipes and a coal smoke branch pipe which are arranged in parallel; a plurality of gas three-way reversing valves are communicated with the gas main pipe in parallel, a first port of each gas three-way reversing valve is connected with a gas branch pipe, and a second port of each gas three-way reversing valve is connected with a soot branch pipe; the air heat storage system comprises an air main pipe, a plurality of air branch pipes and air and smoke branch pipes which are arranged in parallel; a plurality of air three-way reversing valves are connected to the air main pipe in parallel, first ports of the air three-way reversing valves are connected with air branch pipes, and second ports of the air three-way reversing valves are connected with air smoke branch pipes;
the burner is communicated with a gas branch pipe and an air branch pipe;
the gas main pipe is provided with a flow detection device and a component detection device; a second flow detection device is arranged on the air main pipe; and the gas branch pipe and the air branch pipe are provided with detection equipment.
Further, a coal gas heat storage box body and an air heat storage box body are arranged on the burner, the burner is communicated with the coal gas branch pipe through the coal gas heat storage box body, and the burner is also communicated with the air branch pipe through the air heat storage box body.
Further, a first CO sensor is arranged on the soot branch pipe; a second CO sensor is arranged on the gas branch pipe; the hollow cigarette pipe is provided with a first O2A sensor; the air branch pipe is provided with a second O2A sensor.
Furthermore, flow detection devices are arranged on the gas branch pipe and the air branch pipe.
Furthermore, the gas branch pipe and the air branch pipe are both provided with a pressure sensor and a flow detection device.
Furthermore, temperature detection devices are arranged on the gas branch pipe and the air branch pipe.
Furthermore, flow regulating valves are arranged on the coal gas branch pipe and the air branch pipe.
The beneficial effects of the utility model reside in that:
through proposing reasonable combustion system configuration, can dig out the relevant data in the burning process of two heat accumulations effectively, judge the problem that present two heat accumulation burning system and equipment often appear through the data, include: the three-way reversing valve leakage, heat accumulator blockage or short circuit, unreasonable air-fuel ratio configuration, over-temperature smoke exhaust and other common problems can be accurately found, production operators can be guided to quickly and effectively solve related problems, equipment damage, furnace shutdown and the like caused by problem accumulation are avoided, production efficiency and continuity are improved, and equipment operation and maintenance cost is reduced.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.
Drawings
For the purposes of promoting a better understanding of the objects, features and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic view of a dual regenerative combustion system;
reference numerals: the system comprises a gas main pipe 1, a gas main pipe component detection device 10, a gas main pipe flow detection device 11, a first CO sensor 12, a gas three-way reversing valve 13, a gas branch pipe flow detection device 14, a gas branch pipe flow control valve 15, a gas branch pipe pressure sensor 16, a gas branch pipe temperature sensor 17, a second CO sensor 18, a gas heat storage box body 19, an air main pipe 2, an air main pipe flow detection device 21, a first O-shaped valve2Sensor 22, air three-way reversing valve 23, air branch flow detection device 24, air branch flow control valve 25, air branch pressure sensor 26, air branch temperature sensor 27 and second O2The device comprises a sensor 28, an air heat accumulation box 29, a soot outlet end 1301, a coal gas inlet end 1302, an air and smoke outlet end 2301 and an air inlet end 2302.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in any way limiting the scope of the invention; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc., indicating directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and those skilled in the art can understand the specific meanings of the terms according to specific situations.
Referring to fig. 1, a dual heat storage intelligent diagnosis combustion system comprises a gas heat storage system and an air heat storage system, wherein the gas heat storage system comprises a gas main pipe 1, a plurality of gas branch pipes and soot branch pipes which are arranged in parallel; the gas main pipe 1 is connected with a plurality of gas three-way reversing valves 13 in parallel and is connected with the gas branch pipes and the soot branch pipes through ports of the gas three-way reversing valves 13, the gas main pipe 1 and the soot branch pipes are positioned at the same side of the gas three-way reversing valves 13, and the gas branch pipes are positioned at one side of the gas three-way reversing valves 13 opposite to the gas main pipe and the soot branch pipes; the gas main pipe 1 is provided with a gas main pipe component detection device 10 and a gas main pipe flow detection device 11; the soot branch pipe is provided with a first CO sensor 12; a gas branch pipe flow detection device 14, a gas branch pipe flow control valve 15, a gas branch pipe pressure sensor 16, a gas branch pipe temperature sensor 17, a second CO sensor 18 and a gas heat storage box 19 are sequentially connected to the gas branch pipe along the gas flow direction;
the air heat storage system comprises an air main pipe 2, a plurality of air branch pipes and air and smoke branch pipes which are arranged in parallel; the air main pipe 2 is connected with a plurality of air three-way reversing valves 23 in parallel and is connected with the air branch pipes and the empty cigarette pipes through the ports of the air three-way reversing valves 23, the air main pipe 2 and the empty cigarette pipes are positioned at the same side of the air three-way reversing valves 23, and the air branch pipes are positioned at one side of the air three-way reversing valves 23 opposite to the air main pipe 2 and the empty cigarette pipes; the air main pipe 2 is provided with an air main pipe 2 flow detection device 21; the hollow cigarette pipe is provided with a first O2A sensor 22; an air branch pipe flow detection device 24, an air branch pipe flow regulating valve 25, an air branch pipe pressure sensor 26, an air branch pipe temperature sensor 27 and a second O are sequentially connected to the air branch pipe along the air flow direction2A sensor 28 and an air thermal storage tank 29.
The gas heat storage box body 19 and the air heat storage box body 29 are both arranged on the same burner, and gas and air are mixed and combusted in the burner; the system is provided with a plurality of burners, only 4 burners are drawn in the embodiment, burners A1, A2, B1 and B2 are drawn, the same letter, such as A1, represents the same burner, and all the burners in the combustion system work in an alternate cycle; and the combustion state and the smoke exhaust state are mutually converted.
A diagnosis use method of a double-heat-storage intelligent diagnosis combustion system comprises the following steps:
s1, judging the leakage rate of a gas three-way reversing valve 13 through the numerical values of a first CO sensor 12, a second CO sensor 18 and a gas branch pipe flow detection device 14; the leakage rate of the air three-way reversing valve 23 is judged through the first O2 sensor 22, the second O2 sensor 28 and the air branch pipe flow detection device 24;
s10, a leakage diagnosis step of the specific gas three-way reversing valve 13,
s101, judging whether the gas inlet end 1302 of the gas three-way reversing valve 13 leaks or not is as follows: when the burner tip is usedWhen the burner is in a smoke discharging state, at the moment, soot is discharged from the burner through the gas branch pipe, the gas three-way reversing valve 13 and the soot branch pipe; compares the detected value phi of the first CO sensor 12COAnd the detection value of the second CO sensor 18
The size of (1) when
When the leakage rate is measured, judging that the gas inlet end 1302 of the gas main 1 connected with the gas three-way reversing valve 13 leaks, subtracting and comparing the numerical value of the gas main flow detection device 11 with the numerical value of each gas branch flow detection device 14, and prompting the control system to overhaul the gas inlet end 1302 of the gas three-way reversing valve 13;
s102, judging whether the soot outlet end 1301 of the gas three-way reversing valve 13 leaks or not is as follows: when the burner is switched from a smoke exhaust state to a combustion state, gas passes through a gas inlet end 1302 of the gas three-way reversing valve 13 from the gas main pipe 1 and the gas branch pipe to reach the burner; at this time, when the detection value φ of the first CO sensor 12CORises to the detection value of the second CO sensor 18 within 10s
And more than 50 percent of the total amount of the coal gas, the coal smoke outlet end 1301 of the coal gas three-way reversing valve 13 connected with the coal smoke branch pipe is judged to have leakage, and the control system prompts to overhaul the coal smoke outlet end 1301 of the coal gas three-way reversing valve 13.
S11, specifically, a leakage diagnosis step of the air three-way reversing valve 23,
s111, judging whether the air inlet end 2302 of the air three-way reversing valve 23 leaks or not is as follows: when the burner is in a smoke exhaust state, the empty smoke is exhausted from the burner through the air branch pipe, the air three-way reversing valve 23 and the empty smoke branch pipe; compare the first O2Detection value phi O of sensor 222And a second O2The value detected by the sensor 28
The size of (1) when
When the leakage is judged to exist at the air inlet end 2302 of the air three-way valve connected with the air main pipe 2; subtracting the detection value of the air main pipe flow detection device 21 from the detection value of the air branch pipe flow detection device 24, and comparing to convert the leakage rate; at this point, the control system prompts the service air inlet port 2302 of the three way diverter valve 23;
s112, judging whether the air-smoke outlet end 2301 of the air three-way reversing valve 23 leaks or not is as follows: when the burner is switched from a smoke exhaust state to a combustion state, air flows from the air main pipe 2 to the burner through the air three-way reversing valve 23 and the air branch pipe; at this time, the first O2Detection value phi O of sensor 222Rises to the second air branch pipe O within 10s2Sensor detection value
And 21% and above, judging that the empty cigarette outlet end 2301 of the air three-way reversing valve 23 connected with the empty cigarette pipe has leakage, and prompting by the control system to overhaul the empty cigarette outlet end 2301 of the air three-way reversing valve 23.
S2, judging whether the gas heat storage box body 19 is blocked or short-circuited through the numerical values of the gas branch pipe pressure sensor 16 and the gas branch pipe flow detection device 14; judging whether the air heat accumulation box body 29 is blocked or short-circuited according to the values of the air branch pressure sensor 26 and the air branch flow detection device 24;
s201, judging a short circuit or blockage of the gas heat storage box 19: when the burner is in a combustion state, if the gas heat accumulation box body 19 is in a normal working state, the gas pressure and flow in front of the burner are in accordance with a designed pressure-flow curve; if the detection value of the gas branch pipe pressure sensor 16 is lower than 90% of the design pressure value corresponding to the value of the gas branch pipe flow detection device 14 at the moment, the control system judges that the heat accumulator of the gas heat accumulation box 19 is short-circuited; if the detection value of the gas branch pipe pressure sensor 16 is higher than 110% of the design pressure value corresponding to the value of the gas branch pipe flow detection device 14, the control system judges that the heat accumulator of the gas heat accumulation box 19 is blocked; and the control system prompts maintenance of the heat accumulator.
S202, a short circuit or blockage judgment method of the air heat storage box body 29 comprises the following steps: when the burner is in a combustion state, if the air heat accumulation box body 29 is in a normal working state, the air pressure and the flow in front of the burner are in accordance with a designed pressure-flow curve; if the detection value of the air branch pipe pressure sensor 26 is lower than 90% of the design pressure value corresponding to the numerical value of the air branch pipe flow detection device 24 at the moment, the control system judges that the heat accumulator of the air heat accumulation box body 29 is short-circuited; if the detection value of the air branch pipe pressure sensor 26 is higher than 110% of the design pressure value corresponding to the value of the air branch pipe flow detection device 24, the control system judges that the heat accumulator of the air heat accumulation box body 29 is blocked; and the control system prompts the maintenance of the heat accumulator.
S3, passing through a second CO sensor 18 and a second O2The sensor 28 judges whether the system setting air-fuel ratio is reasonable or not; the reason of the over-high or under-high air-fuel ratio is judged according to the values of the gas main component detection device 10, the set air-fuel ratio, the gas main flow detection device 11, the air main flow detection device 21, the gas branch flow detection device 14 and the air branch flow detection device 24;
s301, the method for judging the air-fuel ratio of the combustion system is as follows: when the burners A1 and A2 are in a smoke exhaust state; if the detected value of the second CO sensor 18 in the smoke evacuation state is < 100ppm, the second O2O measured by the sensor 282If the content is always greater than 5%, the system judges that the air ratio of other burners B1 and B2 in the combustion state in the hearth is too high; the system prompts to check the air-to-fuel ratio;
judging whether the currently set air-fuel ratio is too high according to the values of the current gas main component detection device 10, the gas main flow detection device 11 and the air main 2 flow detection device 21; then comparing the sum of the value of the gas main pipe flow detection device 11 and the value of the gas branch pipe flow detection device 14 in each combustion state, and when the value of the gas main pipe flow detection device 11 is larger than the sum of the gas branch pipe flow detection values of the burners in the combustion states; the control system judges that the gas three-way reversing valve 13 leaks; and then judging whether the gas inlet end 1302 of the gas three-way reversing valve 13 in the smoke exhaust state and the soot outlet end 1301 of the gas three-way reversing valve 13 in the combustion state leak or not according to the step S101 and the step S102, if so, judging that the gas three-way reversing valve 13 leaks to cause the air-fuel ratio to be too high, and prompting the control system to overhaul the gas three-way reversing valve 13.
S302, judging whether the air-fuel ratio of the combustion system is insufficient is as follows: when the burners A1 and A2 are in a smoke exhaust state; if the second CO sensor 18 in the smoke exhaust state detects a value > 100ppm and the second O is detected2O measured by sensor 282If the content is less than 0.5%, the system judges that the air-to-air ratio of other burners B1 and B2 in the combustion state in the hearth is insufficient; the system prompts to check the air-to-fuel ratio;
judging whether the currently set air-fuel ratio is too low or not according to the values of the current gas main component detection device 10, the gas main flow detection device 11 and the air main flow detection device 21; comparing the value of the flow detection device 21 of the air main pipe 2 with the sum of the measured values of the flow detection devices 24 of the air branch pipes in the combustion state, and when the value of the flow detection device 21 of the air main pipe 2 is larger than the sum of the flow detection values of the air branch pipes at the burners; the control system judges that the air three-way reversing valve 23 leaks; and then according to the above, judging whether the air inlet end 2302 of the air three-way reversing valve 23 in the smoke exhaust state and the air smoke outlet end 2301 of the air three-way reversing valve 23 in the combustion state leak, if so, judging that the air three-way reversing valve 23 leaks to cause the reason of overhigh air-fuel ratio, and prompting to overhaul the air three-way reversing valve 23 by the control system.
And S4, judging the reason of the over-temperature of the exhaust smoke according to the leakage rate of the gas three-way reversing valve 13, the leakage rate of the air three-way reversing valve 23, whether the gas heat storage box body 19 is blocked or short-circuited, and whether the air heat storage box body 29 is blocked or short-circuited and the air-to-air ratio is too high or insufficient.
S401, the method for diagnosing the overtemperature of the exhaust smoke of the combustion system comprises the following steps: the burners A1 and A2 are in a smoke exhaust state, and the other burners are in a combustion state; when the detection value of the temperature sensor of the air and gas branch pipes in the smoke exhaust state exceeds a set value; judging whether the air-fuel ratio of the rest burners in the combustion state is insufficient or not by the control system according to the step S3; then according to step S2, whether the heat accumulator of the burner is short-circuited or blocked; and (4) judging whether the air and gas three-way reversing valve 13 leaks or not according to the step S1, judging that the reason is the excessive temperature of the discharged smoke once the control system finds a problem, and prompting the control system to solve the corresponding problem.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.
Claims (7)
1. A double-heat-storage intelligent diagnosis combustion system comprises a coal gas heat storage system and an air heat storage system, and is characterized in that the coal gas heat storage system comprises a coal gas main pipe, a plurality of coal gas branch pipes and a coal smoke branch pipe which are arranged in parallel; a plurality of gas three-way reversing valves are communicated with the gas main pipe in parallel, a first port of each gas three-way reversing valve is connected with a gas branch pipe, and a second port of each gas three-way reversing valve is connected with a soot branch pipe; the air heat storage system comprises an air main pipe, a plurality of air branch pipes and air and smoke branch pipes which are arranged in parallel; a plurality of air three-way reversing valves are connected to the air main pipe in parallel, first ports of the air three-way reversing valves are connected with air branch pipes, and second ports of the air three-way reversing valves are connected with air smoke branch pipes;
the burner is communicated with a gas branch pipe and an air branch pipe;
the gas main pipe is provided with a flow detection device and a component detection device; a second flow detection device is arranged on the air main pipe; and detection equipment is arranged on the coal gas branch pipe and the air branch pipe.
2. The dual thermal storage intelligent diagnosis combustion system of claim 1, wherein a gas thermal storage box and an air thermal storage box are provided on the burner, the burner is communicated with the gas branch pipe through the gas thermal storage box, and the burner is further communicated with the air branch pipe through the air thermal storage box.
3. The dual thermal storage intelligent diagnostic combustion system of claim 1, wherein a first CO sensor is provided on the soot branch; a second CO sensor is arranged on the gas branch pipe; the hollow cigarette pipe is provided with a first O2A sensor; the air branch pipe is provided with a second O2A sensor.
4. The dual-thermal-storage intelligent diagnosis combustion system as claimed in claim 3, wherein flow detection devices are further provided on the gas branch pipe and the air branch pipe.
5. The dual-thermal-storage intelligent-diagnosis combustion system as claimed in claim 1, wherein the gas branch pipe and the air branch pipe are provided with a pressure sensor and a flow detection device.
6. The dual-thermal-storage intelligent diagnosis combustion system as claimed in claim 1, wherein temperature detection devices are provided on the gas branch pipe and the air branch pipe.
7. The dual thermal storage intelligent diagnostic combustion system of any one of claims 1 to 6, wherein flow regulating valves are provided on the gas branch and the air branch.
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| CN114485201A (en) * | 2022-03-01 | 2022-05-13 | 重庆燃控科技有限公司 | Double-heat-storage intelligent diagnosis combustion system and diagnosis method |
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