CN114485201B - Dual-heat-storage intelligent diagnosis combustion system and diagnosis method - Google Patents

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

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Publication number
CN114485201B
CN114485201B CN202210194177.4A CN202210194177A CN114485201B CN 114485201 B CN114485201 B CN 114485201B CN 202210194177 A CN202210194177 A CN 202210194177A CN 114485201 B CN114485201 B CN 114485201B
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air
gas
branch pipe
detection device
way reversing
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CN114485201A (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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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Air Supply (AREA)

Abstract

The present invention relates toA dual heat accumulation intelligent diagnosis combustion system and a diagnosis method belong to the technical field of ferrous metallurgy combustion systems. The system comprises a 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 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 O 2 The detection equipment such as the sensor can timely find out problems in the running process; solves the technical problems of exceeding CO content, overtemperature smoke exhaust and damage and overhaul of heat accumulator in the traditional double heat accumulation combustion system.

Description

Dual-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
The steel rolling heating furnace is important equipment and energy-consuming households in the hot rolling process of steel production, the steel rolling heating furnace generally adopts self-produced gas of a steel mill as fuel, the heating furnace adopts a double heat accumulation combustion mode to directly use low-heat-value fuels 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 accumulation heating furnace is applied to a large number of steel mills in recent years, so that better energy-saving and emission-reducing effects are obtained. However, the double heat accumulation combustion also has some problems, such as exceeding the standard of the CO content in the flue gas, overtemperature of the flue gas, damage of the heat accumulator and the like, and the conventional system design and control method are difficult to accurately judge the problems of the combustion system in advance, so that the daily maintenance of the system and equipment cannot be kept up, the furnace is usually stopped when the problems are exposed, and a plurality of problems are often difficult to accurately find reasons, and the problem solving mode is to replace equipment or materials, so that the production is not only influenced, but also the maintenance cost is high.
Therefore, how to enable the double heat storage heating furnace to timely find out problems occurring in the operation process and accurately find out reasons, enable operators to rapidly and efficiently solve the problems, prolong the service life of equipment, ensure the continuity of production to the greatest extent, and are the problems to be solved urgently. In addition, with the development of intelligent informatization, it is increasingly important to mine problems, analyze problems and solve problems through production data.
Disclosure of Invention
In view of the above, the invention aims to provide a double-heat-storage intelligent diagnosis combustion system and a diagnosis method, which can timely find out problems in the running process; solves the technical problems of exceeding CO content, overtemperature smoke exhaust and damage and overhaul of heat accumulator in the traditional double heat accumulation combustion system.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the double heat accumulation intelligent diagnosis combustion system comprises a gas heat accumulation system and an air heat accumulation system, wherein the gas heat accumulation system comprises a gas main pipe, a plurality of gas branch pipes and a plurality of soot branch pipes which are arranged in parallel; the gas main pipe is connected with a plurality of gas three-way reversing valves 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 coal smoke 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 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, a first port of each air three-way reversing valve is connected with an air branch pipe, and a second port of each air 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 air-smoke branch pipe is provided with a first O 2 A 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 direction 2 A sensor;
the gas heat storage device further comprises burners which are correspondingly arranged in a matching manner 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 gas heat storage box body is communicated with the gas branch pipe, and the air heat storage box body is communicated with the air branch pipe.
A diagnosis method of a double heat accumulation intelligent diagnosis combustion system uses the double heat accumulation intelligent diagnosis combustion system;
judging the leakage rate of the gas three-way reversing valve through the values of the first CO sensor, the second CO sensor and the gas branch pipe flow detection device; through the first O 2 Sensor, second O 2 The 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 or not through the 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 or not 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 O 2 The sensor numerical value judges whether the system setting space-fuel ratio is reasonable or not;
judging the cause of the excessively high or insufficient air-to-fuel ratio by the numerical 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;
and judging the reason of the overtemperature of the smoke exhaust by 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 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 discharging state, the soot is discharged 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 sensor CO And the detection value of the second CO sensorWhen the size of (a)When the leakage rate is measured and calculated according to the ratio of the numerical value of the flow detection device of the gas main pipe to the numerical value of the flow detection device of each branch pipe, 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 gas passes through a gas three-way reversing valve and a gas branch pipe from a gas main pipe to reach the burner; at this time, when the detection value phi of the first CO sensor CO Rise to the detection value of the second CO sensor within 10sAnd 50% or more of the total number of the gas three-way reversing valves, judging that the leakage exists at the soot outlet end of the gas three-way reversing valve connected with the soot branch pipe, and prompting the overhaul of the soot outlet end of the gas three-way reversing valve by the control system.
Further, in the air three-way reversing valve leakage diagnosis step,
when the burner is in a smoke discharging state, air smoke is discharged from the burner through the air branch pipe, the air three-way reversing valve and the air smoke branch pipe; comparison of first O 2 Detection value phiO of sensor 2 And a second O 2 Sensor detection valueIs as follows>When the air inlet end connected with the air main pipe of the air three-way valve is judged to have leakage; according to the ratio of the value of the air manifold flow detection device to the value of each branch pipe flow detection device, converting out the leakage rate; the control system prompts maintenance of an air inlet end of the air three-way reversing valve;
when the burner is switched from a smoke discharging state to a combustion state, air flows from an air main pipe to the burner through an air three-way reversing valve and an air branch pipe; at this time, the first O 2 Detection value phiO of sensor 2 Rise to the second air branch O within 10 seconds 2 Sensor detection valueAnd (3) 21% or more, judging that the air three-way reversing valve is connected with the air smoke outlet end of the air smoke branch pipe, and prompting the maintenance of the air smoke outlet end of the air three-way reversing valve by the control system.
Further, when the burner is in a combustion state and the detection value of the pressure sensor of the gas branch pipe is lower than 90% of the design pressure value corresponding to the value of the flow detection device of the gas branch pipe at the moment, the control system judges that the heat accumulator of the gas heat accumulation box body has 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 value of the gas branch pipe flow detection device, the control system judges that the heat accumulator of the gas heat accumulation box body is blocked; 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, the control system judges that the heat accumulator of the air heat accumulation box body has a short circuit; 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; the control system prompts maintenance of the heat accumulator.
Further, when part of the burners are in a smoke discharging state; and the detection value of the second CO sensor in the smoke discharging state is less than 100ppm, the second O 2 O measured by sensor 2 If the content is always more than 5%, the system judges that the air-fuel ratio of other burners in a combustion state in the hearth is too high; the system prompts to check the space-to-natural ratio;
judging whether the currently set air-fuel ratio is too high or not according to the numerical 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 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 measured values of the gas branch pipes of the burner in a burning state; the control system judges that the gas three-way reversing valve has leakage; and judging whether the gas inlet end of the gas three-way reversing valve in the smoke discharging state and the gas 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 excessively high air-fuel ratio, and prompting the overhaul of the gas three-way reversing valve by the control system.
Further, when part of the burners are in a smoke discharging state; detection of a second CO sensor in a Smoke-discharging stateA value of > 100ppm, and a second O 2 O measured by sensor 2 If the content is less than 0.5%, the system judges that the air-fuel ratio of other burners in the combustion state in the hearth is insufficient; the system prompts to check the space-to-natural ratio;
judging whether the currently set air-fuel ratio is too low or not according to the numerical 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 air manifold 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 manifold flow detection device is larger than the sum of the measured values of the air branch pipe flows of the burner in a combustion state; the control system judges that the air three-way reversing valve has leakage; and 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 are leaked, if so, judging that the leakage of the air three-way reversing valve is the cause of the excessively high air-fuel ratio, and prompting the maintenance of the air three-way reversing valve by the control system.
Further, part of burners are in a smoke discharging state, and when the detection value of a temperature sensor of an empty gas branch pipe in the smoke discharging state exceeds a set value; the control system judges whether the air-fuel ratio of the rest of the burners in the combustion state is insufficient; judging whether the heat accumulator of the burner is short-circuited or blocked; judging whether the air and gas three-way reversing valve leaks or not, judging that the air and gas three-way reversing valve is the cause of overtemperature of smoke exhaust 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 excavate the relevant data in the two heat accumulation combustion processes effectively, judge the problem that present two heat accumulation combustion systems and equipment frequently appear through data, include: the three-way reversing valve has the common problems of leakage, blockage or short circuit of a heat accumulator, unreasonable air ratio configuration, overtemperature of smoke exhaust and the like, and can accurately find out the reasons for generating the problems, so that production operators can be guided to quickly and effectively solve the related problems, equipment damage, furnace shutdown and the like caused by problem accumulation are avoided, the production efficiency and the continuity are improved, and the running and maintenance cost of the equipment 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 objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a dual regenerative combustion system;
reference numerals: gas main 1, gas main composition detection device 10, gas main flow detection device 11, first CO sensor 12, gas three-way reversing valve 13, gas branch flow detection device 14, gas branch flow control valve 15, gas branch pressure sensor 16, gas branch temperature sensor 17, second CO sensor 18, gas heat storage box 19, air main 2, air main flow detection device 21, first O 2 Sensor 22, air three-way reversing valve 23, air branch flow detecting device 24, air branch flow regulating valve 25, air branch pressure sensor 26, air branch temperature sensor 27, second O 2 Sensor 28, air thermal storage tank 29, soot outlet 1301, gas inlet 1302, empty soot outlet 2301, air inlet 2302.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the invention; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated 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 numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present invention, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
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 a plurality of 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 a gas branch pipe and a coal smoke branch pipe through ports of the gas three-way reversing valves 13, the gas main pipe 1 and the coal smoke branch pipe are positioned on the same side of the gas three-way reversing valves 13, and the gas branch pipe is positioned on one side of the gas three-way reversing valves 13 opposite to the gas main pipe and the coal smoke branch pipe; 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; the gas branch pipe is sequentially connected with a gas branch pipe flow detection device 14, a gas branch pipe flow regulating 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 along the gas flow direction;
the air heat storage system comprises an air main pipe 2, a plurality of air branch pipes which are arranged in parallel and an air smoke branch pipe; the air main pipe 2 is connected with a plurality of air three-way reversing valves 23 in parallel, and is connected with an air branch pipe and an air smoke branch pipe through ports of the air three-way reversing valves 23, the air main pipe 2 and the air smoke branch pipe are positioned on the same side of the air three-way reversing valves 23, and the air branch pipe is positioned on one side of the air three-way reversing valves 23 opposite to the air main pipe 2 and the air smoke branch pipe; the air main pipe 2 is provided with an air main pipe 2 flow detection device 21; the air-smoke branch pipe is provided with a first O 2 A sensor 22; the air branch pipe is sequentially connected with 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 along the air flow direction 2 A sensor 28 and an air heat storage tank 29.
The gas heat accumulating box 19 and the air heat accumulating box 29 are arranged on the same burner, and the gas and the 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, and the burners A1, A2, B1 and B2 are the same, and the same letters like A1 indicate the same burner, and all the burners in the combustion system work in an alternating and circulating way; the combustion state and the smoke discharging state are mutually switched.
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 values of a first CO sensor 12, a second CO sensor 18 and a gas branch pipe flow detection device 14; judging the leakage rate of the air three-way reversing valve 23 by the first O2 sensor 22, the second O2 sensor 28 and the air branch pipe flow detection device 24;
s10, a specific leakage diagnosis step of the 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 by the following method: when the burner is in a smoke discharging state, at the moment, the soot is discharged from the burner through the gas branch pipe, the gas three-way reversing valve 13 and the soot branch pipe; comparing the detected value phi of the first CO sensor 12 CO And a second CO sensor 18Measuring valueIs as follows>When the gas inlet 1302 of the gas main pipe 1 is connected with the gas three-way reversing valve 13, the gas inlet 1302 is judged to have leakage, and the gas three-way reversing valve is subtracted from the gas branch pipe flow detection devices 14 according to the gas main pipe flow detection device 11; the leakage rate is calculated, and at the moment, the control system prompts 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 by the following method: when the burner is switched from a smoke discharging state to a combustion state, coal gas passes through a coal gas inlet end 1302 of a coal gas three-way reversing valve 13 and a coal gas branch pipe from a coal gas main pipe 1 to reach the burner; at this time, when the detection value phi of the first CO sensor 12 CO Rise to the detection value of the second CO sensor 18 within 10sAnd 50% or more of the total number of the gas three-way directional control valve 13, and judging that the coal smoke outlet end 1301 of the coal gas three-way directional control valve 13 connected with the coal smoke branch pipe has leakage, and the control system prompts to overhaul the coal smoke outlet end 1301 of the gas three-way directional control valve 13.
S11, specifically, an air three-way reversing valve 23 leakage diagnosis step,
s111, judging whether the air inlet end 2302 of the air three-way reversing valve 23 leaks or not according to the following method: when the burner is in a smoke discharging state, the air smoke is discharged from the burner through the air branch pipe, the air three-way reversing valve 23 and the air smoke branch pipe; comparison of first O 2 Detection value phiO of sensor 22 2 And a second O 2 Sensor 28 detection valueIs as follows>When the air three-way valve is connected with the air inlet end 2302 of the air main pipe 2, the air three-way valve is judged to have leakage; and based on the value of the air manifold flow rate detection device 21 and the air branchesThe values of the pipe flow rate detection device 24 are subtracted and compared to convert the leakage rate; at this time, the control system prompts maintenance of the air inlet end 2302 of the air three-way reversing valve 23;
s112, judging whether the air smoke outlet end 2301 of the air three-way reversing valve 23 leaks or not according to the following method: when the burner is switched from a smoke discharging 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 O 2 Detection value phiO of sensor 22 2 Rise to the second air branch O within 10 seconds 2 Sensor detection valueAnd 21% or more of (1), it is determined that there is a leak in the air outlet end 2301 of the air three-way selector valve 23 connected to the air branch pipe, and the control system prompts maintenance of the air outlet end 2301 of the air three-way selector 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 storage box 29 is blocked or short-circuited by 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 by the following method: when the burner is in a combustion state, if the gas heat storage box 19 is in a normal working state, the gas pressure and flow in front of the burner accord 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 has short circuit; 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; the control system prompts maintenance of the heat accumulator.
S202, judging a short circuit or blockage of the air heat storage box 29 by the following method: when the burner is in a combustion state, if the air heat storage box 29 is in a normal working state, the air pressure and flow in front of the burner should conform to a designed pressure-flow curve; if the detected value of the air branch pipe pressure sensor 26 is lower than 90% of the designed pressure value corresponding to the value of the air branch pipe flow detection device 24 in the time, the control system judges that the heat accumulator of the air heat accumulation box 29 has a short circuit; if the detected value of the air branch pipe pressure sensor 26 is higher than 110% of the designed 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 29 is blocked; the control system prompts maintenance of the heat accumulator.
S3, through the second CO sensor 18 and the second O 2 The value of the sensor 28 judges whether the system setting air-fuel ratio is reasonable or not; judging the cause of the excessively high or insufficient air-fuel ratio by the numerical 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, judging that the air-fuel ratio of a combustion system is too high, wherein the method comprises the following steps: when the burners A1 and A2 are in a smoke discharging state; if the detection value of the second CO sensor 18 in the smoke discharging state is less than 100ppm, the second O 2 O measured by sensor 28 2 If the content is always more than 5%, the system judges that the air-fuel ratio of other burners B1 and B2 in a combustion state in the hearth is too high; the system prompts to check the space-to-natural ratio;
judging whether the currently set air-fuel ratio is too high 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 2 flow detection device 21; then comparing the value of the gas main flow detection device 11 with the sum of the measured values of the gas branch flow detection devices 14 in each combustion state, and when the value of the gas main flow detection device 11 is larger than the sum of the measured values of the gas branch flows of the burners in the combustion state; the control system judges that the gas three-way reversing valve 13 has leakage; and judging whether the gas inlet end 1302 of the gas three-way reversing valve 13 in the smoke discharging state and the soot outlet end 1301 of the gas three-way reversing valve 13 in the combustion state are leaked or not according to the step S101 and the step S102, if so, judging that the leakage of the gas three-way reversing valve 13 is the cause of the excessively high air-fuel ratio, and prompting the maintenance of the gas three-way reversing valve 13 by the control system.
S302, judging that the air-fuel ratio of the combustion system is insufficient, wherein the method comprises the following steps: when the burners A1 and A2 are in a smoke discharging state; if the detection value of the second CO sensor 18 in the smoke discharging state is more than 100ppm, and the second O 2 O measured by sensor 28 2 If the content is less than 0.5%, the system judges that the air-fuel ratio of other burners B1 and B2 in the combustion state in the hearth is insufficient; the system prompts to check the space-to-natural 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 air manifold 2 flow detection device 21 with the sum of the measurement values of the air branch pipe flow detection devices 24 in the combustion state, and when the value of the air manifold 2 flow detection device 21 is larger than the sum of the measurement values of the air branch pipe flow in the burner; the control system judges that the air three-way reversing valve 23 has leakage; and judging whether the air inlet end 2302 of the air three-way reversing valve 23 in the smoke discharging state and the air smoke outlet end 2301 of the air three-way reversing valve 23 in the combustion state are leaked or not according to the above, if so, judging that the leakage of the air three-way reversing valve 23 is the reason for the excessively high air-fuel ratio, and prompting the maintenance of the air three-way reversing valve 23 by the control system.
S4, judging the reason of the overtemperature of the smoke exhaust by 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 19 is blocked or short-circuited, whether the air heat storage box 29 is blocked or short-circuited and whether the air ratio is too high or insufficient.
S401, a method for diagnosing the overtemperature of smoke discharged by a combustion system is as follows: burners A1 and A2 are in a smoke exhaust state, and the rest burners are in a combustion state; when the detection value of the temperature sensor of the empty gas branch pipe in the smoke discharging state exceeds a set value; judging whether the air-fuel ratio of the rest burners in a burning state is insufficient or not according to the control system in the step S3; then according to the step S2, whether the heat accumulator of the burner is short-circuited or blocked; according to step S1, whether the air and gas three-way reversing valve 13 leaks or not is judged, and once a control system finds a problem, the control system judges that the problem is caused by overtemperature of smoke exhaust and prompts the control system to solve the corresponding problem.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, 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 and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.

Claims (8)

1. The diagnosis method of the double heat accumulation intelligent diagnosis combustion system is characterized in that the used double heat accumulation intelligent diagnosis combustion system comprises a gas heat accumulation system and an air heat accumulation system, wherein the gas heat accumulation system comprises a gas main pipe, a plurality of gas branch pipes and a plurality of soot branch pipes which are arranged in parallel; the gas main pipe is connected with a plurality of gas three-way reversing valves 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 coal smoke 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 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, a first port of each air three-way reversing valve is connected with an air branch pipe, and a second port of each air 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 air-smoke branch pipe is provided with a first O 2 A 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 direction 2 A sensor;
the gas heat storage device further comprises burners which are correspondingly arranged in a matching manner 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 gas heat storage box body is communicated with the gas branch pipe, and the air heat storage box body is communicated with the air branch pipe;
the diagnosis method comprises the following steps:
judging the leakage rate of the gas three-way reversing valve through the values of the first CO sensor, the second CO sensor and the gas branch pipe flow detection device; through the first O 2 Sensor, second O 2 The 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 or not through the 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 or not 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 O 2 The sensor numerical value judges whether the system setting space-fuel ratio is reasonable or not;
judging the cause of the excessively high or insufficient air-to-fuel ratio by the numerical 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;
and judging the reason of the overtemperature of the smoke exhaust by 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 ratio is too high or not.
2. The diagnostic method of a dual regenerative intelligent diagnostic combustion system according to claim 1, wherein the leakage diagnosing step of the gas three-way directional valve,
when the burner is in a smoke discharging state, the soot is discharged from the burner through the gas branch pipe, the gas three-way reversing valve and the soot branch pipe; comparing the detection value phi CO of the first CO sensor with the detection value CO of the second CO sensor, judging that the gas inlet end of the gas three-way reversing valve connected with the gas main pipe has leakage when phi CO is more than CO, calculating leakage rate according to the ratio of the value of the flow detection device of the gas main pipe to the value of the flow detection device of each branch pipe, and prompting the control system 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 gas passes through a gas three-way reversing valve and a gas branch pipe from a gas main pipe to reach the burner; at this time, when the detection value phi CO of the first CO sensor rises to 50% or more of the detection value CO of the second CO sensor within 10 seconds, it is judged that leakage exists at the soot outlet end of the gas three-way reversing valve connected with the soot branch pipe, and the control system prompts maintenance of the soot outlet end of the gas three-way reversing valve.
3. The diagnostic method of a dual regenerative intelligent diagnostic combustion system according to claim 1, wherein the air three-way reversing valve leakage diagnosing step,
when the burner is in a smoke discharging state, air smoke is discharged from the burner through the air branch pipe, the air three-way reversing valve and the air smoke branch pipe; comparison of first O 2 Detection value phiO of sensor 2 And a second O 2 Sensor detection value O 2 When phi O 2 ＞O 2 When the air inlet end connected with the air main pipe of the air three-way valve is judged to have leakage; according to the ratio of the value of the air manifold flow detection device to the value of each branch pipe flow detection device, converting out the leakage rate; the control system prompts maintenance of an air inlet end of the air three-way reversing valve;
when the burner is switched from a smoke discharging state to a combustion state, air flows from an air main pipe to the burner through an air three-way reversing valve and an air branch pipe; at this time, the first O 2 Detection value phiO of sensor 2 Rise to the second air branch O within 10 seconds 2 Sensor detection value O 2 And (3) 21% or more, judging that the air three-way reversing valve is connected with the air smoke outlet end of the air smoke branch pipe, and prompting the maintenance of the air smoke outlet end of the air three-way reversing valve by the control system.
4. The diagnostic method of a dual thermal storage intelligent diagnostic combustion system according to claim 1, wherein the control system judges that the thermal storage body of the gas thermal storage box has a short circuit 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 value of the gas branch pipe flow detection device at the moment; when the detection value of the gas branch pipe pressure sensor is higher than 110% of the design pressure value corresponding to the value of the gas branch pipe flow detection device, the control system judges that the heat accumulator of the gas heat accumulation box body is blocked; the control system prompts maintenance of the heat accumulator.
5. The diagnostic method of a dual thermal storage intelligent diagnostic combustion system according to claim 1, wherein the control system judges that the thermal storage body of the air thermal storage tank has a short circuit 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 value of the air branch pipe 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 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; the control system prompts maintenance of the heat accumulator.
6. The diagnostic method of a dual regenerative intelligent diagnostic combustion system according to claim 1 or 2, wherein when a part of burners are in a smoke discharge state; and the detection value of the second CO sensor in the smoke discharging state is less than 100ppm, the second O 2 O measured by sensor 2 If the content is always more than 5%, the system judges that the air-fuel ratio of other burners in a combustion state in the hearth is too high; the system prompts to check the space-to-natural ratio;
judging whether the currently set air-fuel ratio is too high or not according to the numerical 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 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 measured values of the gas branch pipes of the burner in a burning state; the control system judges that the gas three-way reversing valve has leakage; and judging whether the gas inlet end of the gas three-way reversing valve in the smoke discharging state and the gas 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 excessively high air-fuel ratio, and prompting the overhaul of the gas three-way reversing valve by the control system.
7. The diagnostic method of a dual regenerative intelligent diagnostic combustion system according to claim 1 or 3, wherein when a part of the burners are in a smoke discharge state; the detection value of the second CO sensor in the smoke discharging state is more than 100ppm, and the second O 2 O measured by sensor 2 If the content is less than 0.5%, the system judges that the air-fuel ratio of other burners in the combustion state in the hearth is insufficient; the system prompts to check the space-to-natural ratio;
judging whether the currently set air-fuel ratio is too low or not according to the numerical 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 air manifold 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 manifold flow detection device is larger than the sum of the measured values of the air branch pipe flows of the burner in a combustion state; the control system judges that the air three-way reversing valve has leakage; and 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 are leaked, if so, judging that the leakage of the air three-way reversing valve is the cause of the excessively high air-fuel ratio, and prompting the maintenance of the air three-way reversing valve by the control system.
8. The diagnostic method of the double heat accumulation intelligent diagnostic combustion system according to claim 1, wherein part of burners are in a smoke discharging state, and when the temperature sensor detection value of an empty gas branch pipe in the smoke discharging state exceeds a set value; the control system judges whether the air-fuel ratio of the rest of the burners in the combustion state is insufficient; judging whether the heat accumulator of the burner is short-circuited or blocked; judging whether the air and gas three-way reversing valve leaks or not, judging that the air and gas three-way reversing valve is the cause of overtemperature of smoke exhaust once the control system finds a problem, and prompting the control system to solve the corresponding problem.
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