CN114485201A - Double-heat-storage intelligent diagnosis combustion system and diagnosis method - Google Patents

Double-heat-storage intelligent diagnosis combustion system and diagnosis method Download PDF

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CN114485201A
CN114485201A CN202210194177.4A CN202210194177A CN114485201A CN 114485201 A CN114485201 A CN 114485201A CN 202210194177 A CN202210194177 A CN 202210194177A CN 114485201 A CN114485201 A CN 114485201A
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air
gas
branch pipe
detection device
sensor
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CN114485201B (en
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陈婉
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Chongqing Combustion Control Technology Co ltd
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Chongqing Combustion Control Technology Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • F27D2099/0053—Burner fed with preheated gases
    • F27D2099/0055—Fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • F27D2099/0053—Burner fed with preheated gases
    • F27D2099/0056—Oxidant
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
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  • Regulation And Control Of Combustion (AREA)

Abstract

The invention relates to a double-heat-storage intelligent diagnosis combustion system and a diagnosis method, and belongs to the technical field of ferrous metallurgy combustion systems. The system comprises a coal gas heat storage system and an air heat storage system, wherein a flow detection device, a flow regulating valve, a pressure sensor, a temperature sensor and a CO sensor are arranged on the coal gas heat storage system; the air heat storage system is connected with a flow detection device, a flow regulating valve, a pressure sensor, a temperature sensor and an O2The detection equipment such as the sensor can find problems in the operation process in time; the technical problems that the content of CO exceeds the standard, the smoke is exhausted at an excessive temperature, and a heat accumulator is damaged and overhauled in the traditional double-heat-storage combustion system are solved.

Description

Double-heat-storage intelligent diagnosis combustion system and diagnosis method
Technical Field
The invention belongs to the technical field of ferrous metallurgy combustion systems, and relates to a double-heat-storage intelligent diagnosis combustion system and a diagnosis method.
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.
Disclosure of Invention
In view of the above, the present invention aims to provide a dual thermal storage intelligent diagnosis combustion system and a diagnosis method, which can find problems occurring in the operation process in time; the technical problems of overproof CO content, excessive smoke exhaust temperature and damage and maintenance of a heat accumulator in the traditional double-heat-storage combustion system are solved.
In order to achieve the purpose, the invention provides the following technical scheme:
a double-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, a plurality of gas branch pipes and a soot 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 gas main pipe is provided with a gas main pipe component detection device and a gas main pipe flow detection device; the soot branch pipe is provided with a first CO sensor; the gas branch pipe is sequentially connected with a gas branch pipe flow detection device, a gas branch pipe flow regulating valve, a gas branch pipe pressure sensor, a gas branch pipe temperature sensor and a second CO sensor along the gas flow direction;
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; the air main pipe is connected with a plurality of air three-way reversing valves in parallel, the first ports of the air three-way reversing valves are connected with air branch pipes, and the air branch pipes are connected with the first ports of the air three-way reversing valvesA second port of the three-way reversing valve is connected with an air smoke branch pipe; the air main pipe is provided with an air main pipe flow detection device; the hollow cigarette pipe is provided with a first O2A sensor; the air branch pipe is sequentially connected with an air branch pipe flow detection device, an air branch pipe flow regulating valve, an air branch pipe pressure sensor, an air branch pipe temperature sensor and a second O along the air flow direction2A sensor;
the gas-gas heat-storage device also comprises burners correspondingly matched with the gas branch pipes and the air branch pipes, and each burner is provided with a gas heat-storage box body and an air heat-storage box body; the coal gas heat storage box body is communicated with the coal gas branch pipe, and the air heat storage box body is communicated with the air branch pipe.
A diagnostic method of a double-heat-storage intelligent diagnosis combustion system uses the double-heat-storage intelligent diagnosis combustion system;
the leakage rate of the gas three-way reversing valve is judged through the numerical values of the first CO sensor, the second CO sensor and the gas branch pipe flow detection device; through the first O2Sensor, second O2The sensor and the air branch pipe flow detection device judge the leakage rate of the air three-way reversing valve;
judging whether the gas heat storage box body is blocked or short-circuited through the numerical values of the gas branch pipe pressure sensor and the gas branch pipe flow detection device; judging whether the air heat storage box body is blocked or short-circuited through the values of the air branch pipe pressure sensor and the air branch pipe flow detection device;
by a second CO sensor and a second O2Judging whether the air-fuel ratio set by the system is reasonable or not by the sensor value;
the reason that the air-fuel ratio is too high or not is judged according to the values of the gas main component detection device, the set air-fuel ratio, the gas main flow detection device, the air main flow detection device, the gas branch flow detection device and the air branch flow detection device;
the reason of the over-temperature of the exhaust smoke is judged according to the leakage rate of the gas three-way reversing valve, the leakage rate of the air three-way reversing valve, whether the gas heat storage box body is blocked or short-circuited, whether the air heat storage box body is blocked or short-circuited and whether the air-to-air ratio is too high or not.
Further, a leakage diagnosis step of the gas three-way reversing valve,
when the burner is in a smoke exhaust state, the soot is exhausted from the burner through the gas branch pipe, the gas three-way reversing valve and the soot branch pipe; comparing the detected value phi of the first CO sensorCOAnd the detection value of the second CO sensor
Figure BDA0003526384760000021
The size of (1) when
Figure BDA0003526384760000022
When the leakage rate is measured according to the numerical value ratio of the gas main pipe flow detection device to each branch pipe flow detection device, and the control system prompts to overhaul the gas inlet end of the gas three-way reversing valve;
when the burner is switched from a smoke discharging state to a combustion state, the coal gas passes through the coal gas three-way reversing valve and the coal gas branch pipe from the coal gas main pipe to reach the burner; at this time, when the detection value phi of the first CO sensorCORise to the detection value of the second CO sensor within 10s
Figure BDA0003526384760000031
And more than 50 percent of the total amount of the coal gas, judging that the coal smoke outlet end of the coal gas three-way reversing valve connected with the coal smoke branch pipe has leakage, and prompting the control system to overhaul the coal smoke outlet end of the coal gas three-way reversing valve.
Further, a leakage diagnosis step of the air three-way reversing valve,
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 and the empty smoke branch pipe; compare the first O2Detection value phi O of sensor2And a second O2Sensor detection value
Figure BDA0003526384760000032
The size of (1) when
Figure BDA0003526384760000033
When the leakage is detected, the air inlet end of the air three-way valve connected with the air main pipe is judged to have leakage; according to the ratio of the numerical value of the air main pipe flow detection device to the numerical value of each branch pipe flow detection device, the leakage rate is converted; the control system prompts the maintenance of the air inlet end of the air three-way reversing valve;
when the burner is switched from a smoke exhaust state to a combustion state, air flows to the burner from an air main pipe through an air three-way reversing valve and an air branch pipe; at this time, the first O2Detection value phi O of sensor2Rises to the second air branch pipe O within 10s2Sensor detection value
Figure BDA0003526384760000034
And more than 21 percent, judging that the empty cigarette outlet end of the air three-way reversing valve connected with the empty cigarette pipe has leakage, and prompting the control system to overhaul the empty cigarette outlet end of the air three-way reversing valve.
Further, when the burner is in a combustion state and the detection value of the gas branch pipe pressure sensor is lower than 90% of the design pressure value corresponding to the numerical value of the gas branch pipe flow detection device at the moment, the control system judges that the heat accumulator of the gas heat accumulation box body is in a short circuit; when the detection value of the gas branch pipe pressure sensor is higher than 110% of the design pressure value corresponding to the gas branch pipe flow detection device, the control system judges that the heat accumulator of the gas heat accumulation box body is blocked; and the control system prompts maintenance of the heat accumulator.
Further, when the burner is in a combustion state and the detection value of the air branch pipe pressure sensor is lower than 90% of the design pressure value corresponding to the numerical value of the air branch pipe flow detection device at the moment, the control system judges that the heat accumulator of the air heat accumulation box body is short-circuited; when the detection value of the air branch pipe pressure sensor is higher than 110% of the design pressure value corresponding to the value of the air branch pipe flow detection device, the control system judges that the heat accumulator of the air heat accumulation box body is blocked; and the control system prompts the maintenance of the heat accumulator.
Further, when part of the burners are in a smoke exhaust state; and the detection value of the second CO sensor in the smoke exhaust state is less than 100ppm, and the second O is2O measured by sensor2The content is always more than 5 percent, and the system judges other parts in the hearthThe air ratio of the burner in the combustion state 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, the gas main flow detection device and the air main flow detection device; comparing the value of the gas main pipe flow detection device with the sum of the measured values of all the gas branch pipe flow detection devices, and when the value of the gas main pipe flow detection device is larger than the sum of the gas branch pipe flow detection values of the burners in a combustion state; the control system judges that the gas three-way reversing valve has leakage; and then judging whether the gas inlet end of the gas three-way reversing valve in the smoke discharging state and the soot outlet end of the gas three-way reversing valve in the combustion state leak or not, if so, judging that the gas three-way reversing valve leaks to cause the air-fuel ratio to be overhigh, and prompting the maintenance of the gas three-way reversing valve by a control system.
Further, when part of the burners are in a smoke exhaust state; the detection value of the second CO sensor in the smoke exhaust state is more than 100ppm, and the second CO sensor in the smoke exhaust state has the second O2O measured by sensor2If the content is less than 0.5%, the system judges that the air-to-air ratio of other burners 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 according to the values of the current gas main pipe component detection device, the gas main pipe flow detection device and the air main pipe flow detection device; comparing the value of the air bus flow detection device with the sum of the measured values of the air branch pipe flow detection devices, and when the value of the air bus flow detection device is larger than the sum of the measured values of the air branch pipes of the burners in a combustion state; the control system judges that the air three-way reversing valve leaks; and then judging whether the air inlet end of the air three-way reversing valve in the smoke discharging state and the air smoke outlet end of the air three-way reversing valve in the combustion state leak, if so, judging that the air three-way reversing valve leaks to cause the air-fuel ratio to be overhigh, and prompting to overhaul the air three-way reversing valve by a control system.
Further, part of the burners are in a smoke exhaust state, and when the detection values of the temperature sensors of the air and gas branch pipes in the smoke exhaust state exceed a set value; the control system judges whether the air-fuel ratio of the rest of the second burners in the combustion state is insufficient; judging whether a heat accumulator of the burner is short-circuited or blocked; and judging whether the air and gas three-way reversing valve leaks or not, judging that the smoke discharge is caused by over-temperature once the control system finds a problem, and prompting the control system to solve the corresponding problem.
The invention has the beneficial effects that:
through proposing reasonable combustion system configuration, can dig out the relevant data among the two heat accumulation combustion processes effectively, judge the problem that present two heat accumulation combustion 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 combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects 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 embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope 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 in a schematic way, 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 the drawings in which there is no intention to limit the invention thereto; to better illustrate 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 components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art 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.
The diagnosis method of the double-heat-storage intelligent diagnosis combustion system uses the double-heat-storage intelligent diagnosis combustion system; the method 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 is in a smoke exhaust state, at the moment, soot is exhausted 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
Figure BDA0003526384760000061
The size of (1) when
Figure BDA0003526384760000062
When the gas leakage is judged to exist at the gas inlet end 1302 of the gas three-way reversing valve 13 connected with the gas main pipe 1, subtracting the numerical values of the gas main pipe flow detection device 11 and the gas branch pipe flow detection devices 14 and comparing the numerical values; measuring and calculating the leakage rate, and prompting to overhaul the gas inlet end 1302 of the gas three-way reversing valve 13 by the control system at the moment;
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
Figure BDA0003526384760000063
50% or more, judgmentThe coal smoke outlet end 1301 of the coal gas three-way reversing valve 13 connected with the coal smoke branch pipe leaks, and the control system prompts maintenance of 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
Figure BDA0003526384760000071
The size of (1) when
Figure BDA0003526384760000072
When the leakage is detected, the air inlet end 2302 of the air three-way valve connected with the air main pipe 2 leaks; subtracting and comparing the numerical value of each air branch pipe flow detection device 24 according to the numerical value of the air main pipe flow detection device 21, and converting 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 to the burner from the air main pipe 2 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
Figure BDA0003526384760000073
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 a 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 19 is blocked or short-circuited according to the 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 the gas 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 the 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 air-fuel ratio set by the system is reasonable or not according to the value; 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, second O2O measured by 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 intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on 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 claims of the present invention.

Claims (9)

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 gas main pipe is provided with a gas main pipe component detection device and a gas main pipe flow detection device; the soot branch pipe is provided with a first CO sensor; the gas branch pipe is sequentially connected with a gas branch pipe flow detection device, a gas branch pipe flow regulating valve, a gas branch pipe pressure sensor, a gas branch pipe temperature sensor and a second CO sensor along the gas flow direction;
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 air main pipe is provided with an air main pipe flow detection device; the hollow cigarette pipe is provided with a first O2A sensor; the air branch pipe is sequentially connected with an air branch pipe flow detection device, an air branch pipe flow regulating valve, an air branch pipe pressure sensor, an air branch pipe temperature sensor and a second O along the air flow direction2A sensor;
the burner is correspondingly matched with each gas branch pipe and each air branch pipe, and each burner is provided with a gas heat storage box body and an air heat storage box body; the coal gas heat storage box body is communicated with the coal gas branch pipe, and the air heat storage box body is communicated with the air branch pipe.
2. A diagnostic method for a dual-regenerative intelligent diagnostic combustion system, characterized by using the dual-regenerative intelligent diagnostic combustion system of claim 1;
the leakage rate of the gas three-way reversing valve is judged through the numerical values of the first CO sensor, the second CO sensor and the gas branch pipe flow detection device; through the first O2Sensor, second O2The sensor and the air branch pipe flow detection device judge the leakage rate of the air three-way reversing valve;
judging whether the gas heat storage box body is blocked or short-circuited through the numerical values of the gas branch pipe pressure sensor and the gas branch pipe flow detection device; judging whether the air heat storage box body is blocked or short-circuited according to the values of the air branch pipe pressure sensor and the air branch pipe flow detection device;
by a second CO sensor and a second O2Judging whether the air-fuel ratio set by the system is reasonable or not by the sensor value;
the reason that the air-fuel ratio is too high or not is judged according to the values of the gas main component detection device, the set air-fuel ratio, the gas main flow detection device, the air main flow detection device, the gas branch flow detection device and the air branch flow detection device;
the reason of the over-temperature of the exhaust smoke is judged according to the leakage rate of the gas three-way reversing valve, the leakage rate of the air three-way reversing valve, whether the gas heat storage box body is blocked or short-circuited, whether the air heat storage box body is blocked or short-circuited and whether the air-to-air ratio is too high or not.
3. The diagnostic method for a dual-regenerative intelligent diagnostic combustion system as set forth in claim 2, wherein a leakage diagnostic step of the gas three-way directional control valve,
when the burner is in a smoke exhaust state, the soot is exhausted from the burner through the gas branch pipe, the gas three-way reversing valve and the soot branch pipe; comparing the detected value phi of the first CO sensorCOAnd the detection value of the second CO sensor
Figure FDA0003526384750000021
The size of (1) when
Figure FDA0003526384750000022
When the leakage rate is measured according to the numerical value ratio of the numerical value of the gas main pipe flow detection device to the numerical value of each branch pipe flow detection device, and the control system prompts to overhaul the gas inlet end of the gas three-way reversing valve;
when the burner is switched from a smoke discharging state to a combustion state, the coal gas passes through the coal gas three-way reversing valve and the coal gas branch pipe from the coal gas main pipe to reach the burner; at this time, when the detection value phi of the first CO sensorCORise to detection value of second CO sensor within 10s
Figure FDA0003526384750000023
50% or more, it is judged that the soot outlet end of the coal gas three-way reversing valve connected with the soot branch pipe has a leakageAnd the control system prompts the maintenance of the soot outlet end of the gas three-way reversing valve.
4. The diagnostic method for a dual-regenerative intelligent diagnostic combustion system as set forth in claim 2, wherein the air three-way selector valve leakage diagnostic step,
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 and the empty smoke branch pipe; compare the first O2Detection value phi O of sensor2And a second O2Sensor detection value
Figure FDA0003526384750000024
The size of (1) when
Figure FDA0003526384750000025
When the leakage is detected, the air inlet end of the air three-way valve connected with the air main pipe is judged to have leakage; according to the ratio of the numerical value of the air main pipe flow detection device to the numerical value of each branch pipe flow detection device, the leakage rate is converted; the control system prompts the maintenance of the air inlet end of the air three-way reversing valve;
when the burner is switched from a smoke exhaust state to a combustion state, air flows from the air main pipe to the burner through the air three-way reversing valve and the air branch pipe; at this time, the first O2Detection value phi O of sensor2Rises to the second air branch pipe O within 10s2Sensor detection value
Figure FDA0003526384750000026
And more than 21 percent, judging that the empty cigarette outlet end of the air three-way reversing valve connected with the empty cigarette pipe has leakage, and prompting the control system to overhaul the empty cigarette outlet end of the air three-way reversing valve.
5. The diagnostic method for the dual thermal storage intelligent diagnostic combustion system as set forth in claim 2, wherein when the burner is in a combustion state and the detection value of the gas branch pressure sensor is lower than 90% of the design pressure value corresponding to the value of the gas branch flow detection device at that time, the control system determines that the heat accumulator of the gas thermal storage tank is short-circuited; when the detection value of the gas branch pipe pressure sensor is higher than 110% of the design pressure value corresponding to the gas branch pipe flow detection device value, the control system judges that the heat accumulator of the gas heat accumulation box body is blocked; and the control system prompts the maintenance of the heat accumulator.
6. The diagnostic method for a dual thermal storage intelligent diagnostic combustion system as set forth in claim 2, wherein the control system determines that the thermal storage body of the air thermal storage tank is short-circuited when the burner is in a combustion state and the detection value of the air branch pressure sensor is lower than 90% of the design pressure value corresponding to the value of the air branch flow detection device at that time; when the detection value of the air branch pipe pressure sensor is higher than 110% of the design pressure value corresponding to the numerical value of the air branch pipe flow detection device, the control system judges that the heat accumulator of the air heat accumulation box body is blocked; and the control system prompts the maintenance of the heat accumulator.
7. The diagnostic method for the double-heat-storage intelligent diagnosis combustion system as claimed in claim 2 or 3, wherein when part of the burners are in a smoke exhaust state; and the detection value of the second CO sensor in the smoke exhaust state is less than 100ppm, and the second O is2O measured by sensor2If the content is always greater than 5%, the system judges that the air ratio of other burners 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, the gas main flow detection device and the air main flow detection device; comparing the value of the gas main pipe flow detection device with the sum of the measured values of all the gas branch pipe flow detection devices, and when the value of the gas main pipe flow detection device is larger than the sum of the gas branch pipe flow detection values of the burners in a combustion state; the control system judges that the gas three-way reversing valve has leakage; and then judging whether the gas inlet end of the gas three-way reversing valve in the smoke discharging state and the soot outlet end of the gas three-way reversing valve in the combustion state leak or not, if so, judging that the gas three-way reversing valve leaks to cause the air-fuel ratio to be overhigh, and prompting the maintenance of the gas three-way reversing valve by a control system.
8. The diagnostic method for the double-heat-storage intelligent diagnosis combustion system as claimed in claim 2 or 4, wherein when part of the burners are in a smoke exhaust state; the detection value of the second CO sensor in the smoke exhaust state is more than 100ppm, and the second CO sensor in the smoke exhaust state has the second O2O measured by sensor2If the content is less than 0.5%, the system judges that the air-to-air ratio of other burners 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 pipe component detection device, the gas main pipe flow detection device and the air main pipe flow detection device; comparing the value of the air bus flow detection device with the sum of the measured values of the air branch pipe flow detection devices, and when the value of the air bus flow detection device is larger than the sum of the measured values of the air branch pipes of the burners in a combustion state; the control system judges that the air three-way reversing valve leaks; and then judging whether the air inlet end of the air three-way reversing valve in the smoke discharging state and the air smoke outlet end of the air three-way reversing valve in the combustion state leak, if so, judging that the air three-way reversing valve leaks to cause the air-fuel ratio to be overhigh, and prompting to overhaul the air three-way reversing valve by a control system.
9. The diagnosis method of the double-heat-storage intelligent diagnosis combustion system as claimed in claim 2, wherein, part of the burners are in a smoke-discharging state, and when the detection value of the temperature sensor of the air and gas branch pipes in the smoke-discharging state exceeds a set value; the control system judges whether the air-fuel ratio of the rest of the second burners in the combustion state is insufficient; judging whether a heat accumulator of the burner is short-circuited or blocked; and judging whether the air and gas three-way reversing valve leaks or not, judging that the smoke discharge is caused by over-temperature once the control system finds a problem, and prompting the control system to solve the corresponding problem.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030230287A1 (en) * 2002-06-12 2003-12-18 Jun Ozeki Intake system failure detecting device and method for engines
CN101526495A (en) * 2009-04-07 2009-09-09 北京三博中自科技有限公司 Method for detecting transverse oxygen content of burnt gas of coke oven and realizing device thereof
CN203683612U (en) * 2013-12-18 2014-07-02 河北钢铁股份有限公司唐山分公司 Mixed-gas dual regenerative heating furnace for strip steel hot rolling
CN104121409A (en) * 2014-07-14 2014-10-29 河北钢铁股份有限公司唐山分公司 Heat accumulating type heating furnace three-way change valve of improved sealing structure
CN109457105A (en) * 2018-10-26 2019-03-12 福建三钢闽光股份有限公司 A kind of temprature control method based on steel rolling Two-cuff Technique heating furnace
CN216845732U (en) * 2022-03-01 2022-06-28 重庆燃控科技有限公司 Double-heat-storage intelligent diagnosis combustion system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030230287A1 (en) * 2002-06-12 2003-12-18 Jun Ozeki Intake system failure detecting device and method for engines
CN101526495A (en) * 2009-04-07 2009-09-09 北京三博中自科技有限公司 Method for detecting transverse oxygen content of burnt gas of coke oven and realizing device thereof
CN203683612U (en) * 2013-12-18 2014-07-02 河北钢铁股份有限公司唐山分公司 Mixed-gas dual regenerative heating furnace for strip steel hot rolling
CN104121409A (en) * 2014-07-14 2014-10-29 河北钢铁股份有限公司唐山分公司 Heat accumulating type heating furnace three-way change valve of improved sealing structure
CN109457105A (en) * 2018-10-26 2019-03-12 福建三钢闽光股份有限公司 A kind of temprature control method based on steel rolling Two-cuff Technique heating furnace
CN216845732U (en) * 2022-03-01 2022-06-28 重庆燃控科技有限公司 Double-heat-storage intelligent diagnosis combustion system

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