CN112283731B - Soot blowing method and system for heating surface of coal-fired power station boiler - Google Patents
Soot blowing method and system for heating surface of coal-fired power station boiler Download PDFInfo
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- CN112283731B CN112283731B CN202011162899.9A CN202011162899A CN112283731B CN 112283731 B CN112283731 B CN 112283731B CN 202011162899 A CN202011162899 A CN 202011162899A CN 112283731 B CN112283731 B CN 112283731B
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- 239000000428 dust Substances 0.000 claims abstract description 26
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 13
- 238000004364 calculation method Methods 0.000 claims description 5
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- 238000004880 explosion Methods 0.000 abstract description 8
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0044—Furnaces, ovens, kilns
Abstract
The invention discloses a soot blowing method and a soot blowing system for a heating surface of a coal-fired power station boiler, which relate to an infrared camera and a soot blower, and the method comprises the following steps: acquiring an infrared radiation image of a heated surface of the boiler in real time through an infrared camera; calculating a first temperature value of the heating surface of the boiler and a second temperature value of the surface of the soot layer of the heating surface of the boiler according to the infrared radiation image and a preset infrared temperature measurement algorithm; determining the ash deposition area of the heating surface of the boiler and the current ash deposition thickness information based on the first temperature value, the second temperature value and the preset heat conductivity coefficient; dividing the dust deposition area into a plurality of sub-areas, and calculating the average dust deposition thickness information of each sub-area according to the current dust deposition thickness information; and controlling the soot blower to perform soot blowing operation on each sub-region according to the average soot deposition thickness information of each sub-region. The invention provides an effective monitoring means for the pipe wall ash deposition and slagging state, which can flexibly adjust the ash blowing frequency and the ash blowing amount, effectively improve the boiler efficiency and reduce the occurrence rate of pipe explosion accidents.
Description
Technical Field
The invention relates to the technical field of steam soot blowing, in particular to a soot blowing method and a soot blowing system for a heating surface of a coal-fired power station boiler.
Background
The dust deposition, slagging and tube explosion on the high-temperature heating surface of the boiler are common accidents in the operation of coal-fired boilers, and the safe and efficient operation of the boiler is seriously influenced. Slagging and fouling are two distinct and related phenomena occurring on the flue gas side of a boiler. The slag is mainly formed by that molten or partially molten particles carried in the flue gas collide on a heating surface and are cooled and solidified. The form of slagging occurs mainly in the form of a viscous or dissolved precipitate, which mostly occurs on the radiation heating surface. Fouling is also known as dusting or ash deposition and refers to the deposition of ash particles on a heated surface at temperatures below the ash melting point. The contamination is divided into high temperature ash deposition and low temperature ash deposition. The formation temperature of the former is in a certain range under the deformation temperature of the soot particles, and the deposits are mostly generated on convection heating surfaces such as a platen superheater and a convection superheater; the latter occurs primarily on pipe wall surfaces that may be below the acid dew point, such as low temperature economizers and air preheaters, which are formed by the condensation of acid liquor and fly ash. Slagging is generally associated with the physical migration of molten or sticky soot particles carried by the flue gas; the ash deposition degree of the high-temperature viscous ash deposition has a great relationship with the coal types; low temperature ash deposition is associated with condensation of acid or water vapor that occurs on the cooled surfaces. All three of them cause economic and safety problems for boiler operation.
Therefore, in the prior art, steam soot blowing is generally used as one of effective means for improving the cleanliness of the pipe wall of the high-temperature heating surface, but due to the lack of effective monitoring means for the ash deposition and slag bonding state of the pipe wall, the current steam soot blowing strategy of a coal-fired power plant mainly aims at timed soot blowing, and scientific soot blowing cannot be realized. The convection heat transfer coefficient is reduced due to untimely soot blowing, the exhaust gas temperature of the boiler is increased, and the boiler efficiency is reduced; the pipe wall is damaged by over-frequent soot blowing, and the accident rate of pipe explosion is increased.
Disclosure of Invention
The invention provides a soot blowing method and a soot blowing system for a heating surface of a coal-fired power station boiler, which solve the technical problems that in the prior art, due to the lack of an effective monitoring means for the soot deposition and slagging state of a pipe wall, the efficiency of the boiler is reduced and the incidence rate of pipe explosion accidents is possibly increased because the soot blowing frequency and the soot blowing amount cannot be flexibly adjusted.
The invention provides a soot blowing method for a heating surface of a coal-fired power station boiler, which relates to an infrared camera and a soot blower, and comprises the following steps:
acquiring an infrared radiation image of the heating surface of the boiler in real time through the infrared camera;
calculating a first temperature value of the heating surface of the boiler and a second temperature value of the surface of the soot layer of the heating surface of the boiler according to the infrared radiation image and a preset infrared temperature measurement algorithm;
determining the ash deposition area and the current ash deposition thickness information of the heating surface of the boiler based on the first temperature value, the second temperature value and a preset heat conductivity coefficient;
dividing the dust deposition area into a plurality of sub-areas, and calculating the average dust deposition thickness information of each sub-area according to the current dust deposition thickness information;
and controlling the soot blower to perform soot blowing operation on each sub-region according to the average soot deposition thickness information of each sub-region.
Optionally, still relate to the cooler, infrared camera includes camera and infrared sensor, through infrared camera gathers the infrared radiation image of boiler heating surface in real time's step, include:
acquiring infrared radiation information of the heated surface of the boiler in real time through the camera and transmitting the infrared radiation information to the infrared sensor;
generating, by the infrared sensor, the infrared radiation image based on the infrared radiation information;
the cooler is used for receiving compressed air, reducing the camera temperature of camera and sweeping the front end of camera.
Optionally, the step of determining the soot deposition area and the current soot deposition thickness of the heating surface of the boiler based on the first temperature value, the second temperature value and a preset thermal conductivity coefficient includes:
determining a difference between the second temperature value and the first temperature value;
determining the current accumulated ash thickness of the heating surface of the boiler by adopting the difference and a preset heat conductivity coefficient;
and determining the area in the infrared radiation image equal to the second temperature value as the ash deposition area of the heating surface of the boiler.
Optionally, the step of controlling the soot blower to perform a soot blowing operation on each of the sub-regions according to the average soot deposition thickness information of each of the sub-regions includes:
determining the soot blowing starting time and the soot blowing ending time of the soot blower according to the average soot deposition thickness information of each sub-region;
starting the soot blower at the soot blowing starting moment, and controlling the soot blower to output steam with a preset soot blowing steam amount;
and when the soot blowing end time is reached, closing the soot blower.
Optionally, the method further comprises:
when the soot blowing operation of the soot blower is finished, detecting updated soot thickness information of the sub-area;
adjusting the soot blowing steam amount based on the updated soot deposition thickness information.
The invention also provides a soot blowing system for the heating surface of the boiler of the coal-fired power plant, which relates to an infrared camera and a soot blower, and the system comprises:
the infrared radiation image acquisition module is used for acquiring an infrared radiation image of the heating surface of the boiler in real time through the infrared camera;
the temperature value calculation module is used for calculating a first temperature value of the heating surface of the boiler and a second temperature value of the surface of the soot layer of the heating surface of the boiler according to the infrared radiation image and a preset infrared temperature measurement algorithm;
the heating surface information determining module is used for determining the ash deposition area and the current ash deposition thickness information of the heating surface of the boiler based on the first temperature value, the second temperature value and a preset heat conductivity coefficient;
the average dust deposition thickness information calculation module is used for dividing the dust deposition area into a plurality of sub-areas and calculating the average dust deposition thickness information of each sub-area according to the current dust deposition thickness information;
and the soot blowing operation execution module is used for controlling the soot blower to execute soot blowing operation on each sub-region according to the average soot deposition thickness information of each sub-region.
Optionally, still relate to the cooler, infrared camera includes camera and infrared sensor, infrared radiation image acquisition module includes:
the infrared radiation information acquisition submodule is used for acquiring the infrared radiation information of the heating surface of the boiler in real time through the camera and transmitting the infrared radiation information to the infrared sensor;
an infrared radiation image generation sub-module for generating the infrared radiation image based on the infrared radiation information by the infrared sensor;
the cooler is used for receiving compressed air, reducing the camera temperature of camera and sweeping the front end of camera.
Optionally, the heating surface information determining module includes:
a difference determination submodule for determining a difference between the second temperature value and the first temperature value;
the current soot deposition thickness determining submodule is used for determining the current soot deposition thickness of the heating surface of the boiler by adopting the difference value and a preset heat conductivity coefficient;
and the ash deposition area determining submodule is used for determining an area in the infrared radiation image, which is equal to the second temperature value, as an ash deposition area of the heating surface of the boiler.
Optionally, the soot blowing operation performing module includes:
the operation time determining submodule is used for determining the soot blowing starting time and the soot blowing ending time of the soot blower according to the average soot deposition thickness information of each sub-region;
the steam output control submodule is used for starting the soot blower at the soot blowing starting moment and controlling the soot blower to output steam with a preset soot blowing steam amount;
and the soot blower closing sub-module is used for closing the soot blower when the soot blowing end time is reached.
Optionally, the system further comprises:
the ash deposition thickness information updating detection module is used for detecting the updated ash deposition thickness information of the sub-area when the soot blowing operation of the soot blower is finished;
and the soot blowing steam amount modulation module is used for adjusting the soot blowing steam amount based on the updated soot deposition thickness information.
According to the technical scheme, the invention has the following advantages:
the method comprises the steps of acquiring an infrared radiation image of a heated surface of the boiler in real time through an infrared camera, and calculating a first temperature value of the heated surface of the boiler and a second temperature value of the surface of an ash deposition layer on a pipe wall by adopting an infrared temperature measurement algorithm and the infrared radiation image; determining current soot deposition thickness information and a soot deposition area based on the first temperature value, the second temperature value and the heat conductivity coefficient; dividing the ash deposition area into a plurality of sub-areas, calculating the average ash deposition thickness information according to the current ash deposition thickness information in each sub-area, and controlling the soot blower to perform soot blowing operation on each sub-area. The invention provides an effective monitoring means for the pipe wall ash deposition and slagging state, which can flexibly adjust the ash blowing frequency and the ash blowing amount, effectively improve the boiler efficiency and reduce the occurrence rate of pipe explosion accidents.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a flow chart illustrating the steps of a method for blowing soot on a heating surface of a coal-fired power plant boiler in an embodiment of the present invention;
FIG. 2 is a flow chart illustrating the steps of a method for blowing soot on a heating surface of a coal-fired utility boiler in an alternative embodiment of the present invention;
FIG. 3 is a schematic installation diagram of a soot blowing system for a heating surface of a coal-fired power plant boiler in an embodiment of the present invention;
FIG. 4 is a block diagram of a soot blowing system for a heating surface of a coal-fired power plant boiler in an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a soot blowing method and a soot blowing system for a heating surface of a coal-fired power station boiler, which are used for solving the technical problems that the efficiency of the boiler is reduced and the incidence rate of pipe explosion accidents is possibly increased due to the fact that the soot blowing frequency and the soot blowing amount cannot be flexibly adjusted because an effective monitoring means for the soot deposition and slagging state of a pipe wall is lacked in the prior art.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating steps of a soot blowing method for a heating surface of a boiler of a coal-fired power plant according to an embodiment of the present invention.
The invention provides a soot blowing method for a heating surface of a coal-fired power station boiler, which relates to an infrared camera and a soot blower, and comprises the following steps:
in the embodiment of the invention, in order to realize the real-time monitoring of the boiler tube wall, firstly, a real-time image of the boiler heating surface is required to be acquired so as to know whether the boiler heating surface is accumulated with dust or not and the thickness of the accumulated dust, and at the moment, an infrared radiation image of the boiler heating surface can be acquired in real time through an infrared camera.
102, calculating a first temperature value of the heated surface of the boiler and a second temperature value of the surface of the soot layer of the heated surface of the boiler according to the infrared radiation image and a preset infrared temperature measurement algorithm;
the infrared temperature measurement algorithm is an algorithm for measuring infrared energy radiated by an object to obtain the surface temperature of the object, in the embodiment of the invention, the object in the infrared radiation image is distinguished according to different heat radiation characteristics of different positions in the infrared radiation image, and meanwhile, the temperature value of each point in the infrared radiation image is identified based on photoelectric forwarding of the infrared radiation image.
In the embodiment of the invention, based on the infrared temperature measurement algorithm and the infrared radiation image, a first temperature value of the heating surface of the boiler and a second temperature value of the surface of the soot layer are determined, so that the thickness information of the soot layer can be determined subsequently.
103, determining an ash deposition area and current ash deposition thickness information of the boiler heating surface based on the first temperature value, the second temperature value and a preset heat conductivity coefficient;
the thermal conductivity is 1 degree (K, c) of temperature difference between two side surfaces of a 1m thick material under stable heat transfer conditions, and the heat transferred through a 1 square meter area in a certain period of time is in watts/meter-degree (W/(m-K), where K can be replaced by c).
104, dividing the dust deposition area into a plurality of sub-areas, and calculating the average dust deposition thickness information of each sub-area according to the current dust deposition thickness information;
in a specific implementation, after the soot deposition area and the current soot deposition thickness information are determined, since the soot deposition thickness information of the soot deposition area may be different, for example, the portion of the heating surface of the boiler close to the heat source may have a higher soot deposition thickness and the portion far from the heat source may have a lower soot deposition thickness, if the soot blower is controlled to perform soot blowing by using the same soot blowing amount, excessive soot blowing may be performed in some areas, and soot blowing may be insufficient in some areas. At this time, the average soot deposition thickness information of each sub-area can be calculated by dividing the soot deposition area into a plurality of sub-areas, so as to accurately control the soot blowing amount of each area.
And 105, controlling the soot blower to perform soot blowing operation on each sub-region according to the average soot deposition thickness information of each sub-region.
In the embodiment of the invention, an infrared radiation image of the heated surface of the boiler is collected in real time through an infrared camera, and a first temperature value of the heated surface of the boiler and a second temperature value of the surface of an ash deposition layer on the wall of the boiler are calculated by adopting an infrared temperature measurement algorithm and the infrared radiation image; determining current soot deposition thickness information and a soot deposition area based on the first temperature value, the second temperature value and the heat conductivity coefficient; dividing the ash deposition area into a plurality of sub-areas, calculating the average ash deposition thickness information according to the current ash deposition thickness information in each sub-area, and controlling the soot blower to perform soot blowing operation on each sub-area. Therefore, an effective monitoring means for the pipe wall ash deposition and slagging state is provided, the ash blowing frequency and the ash blowing amount can be flexibly adjusted, the boiler efficiency is effectively improved, and the pipe explosion accident rate is reduced.
Referring to fig. 2, fig. 2 is a flowchart illustrating steps of a soot blowing method for a heating surface of a coal-fired power plant boiler according to an embodiment of the present invention.
The invention provides a soot blowing method for a heating surface of a coal-fired power station boiler, which relates to an infrared camera and a soot blower, and comprises the following steps:
optionally, the method further involves a cooler, the infrared camera comprises a camera and an infrared sensor, and the step 201 may comprise the sub-steps of:
acquiring infrared radiation information of the heated surface of the boiler in real time through the camera and transmitting the infrared radiation information to the infrared sensor;
generating, by the infrared sensor, the infrared radiation image based on the infrared radiation information;
in the embodiment of the invention, the cooler is used for receiving compressed air, reducing the temperature of the camera and purging the front end of the camera, so that the camera is cooled, and meanwhile, the influence of the flying ash contamination in the flue gas inside the boiler on the imaging quality of the front end of the camera is prevented. And acquiring infrared radiation information of the heated surface of the boiler in real time through the camera, and sending the infrared radiation information to the infrared sensor for further processing.
And after receiving the infrared radiation information, the infrared sensor forms an infrared radiation image based on the infrared radiation degree difference between the measurement target and the background in the infrared radiation information.
Optionally, in order to prolong the service life of the camera and environmental suitability, the camera may adopt a high temperature resistant camera, and the infrared sensor may adopt a 3.9 micron area array type infrared sensor, which is not limited in the embodiment of the present invention.
in the embodiment of the present invention, the process of step 202 is similar to the process of step 102, and is not described herein again.
In the embodiment of the present invention, the step 103 can be replaced by the following step 203-205.
in the concrete implementation, the difference value between the second temperature value and the first temperature value is calculated, namely the temperature difference between the surface of the soot layer and the heating surface of the boiler is calculated, the heat conductivity coefficient of the soot layer is changed along with the temperature change, and the current soot deposition thickness of the heating surface of the boiler can be determined according to the corresponding relation between the temperature difference and the heat conductivity coefficient.
In one example of the present invention, the second temperature value represents a surface temperature of the soot layer, and in order to determine the soot area, an area having the same surface temperature may be searched in the infrared radiation image, and the area may be determined as the soot area.
in the embodiment of the invention, in order to further improve the soot blowing efficiency and accuracy, the soot deposition area can be subjected to grid division to obtain a plurality of sub-areas, and the average soot deposition thickness information of each sub-area is calculated according to the area of each sub-area and the current soot deposition thickness information.
And step 207, controlling the soot blower to perform soot blowing operation on each sub-region according to the average soot deposition thickness information of each sub-region.
In one example of the present invention, the step 207 may include the following sub-steps:
determining the soot blowing starting time and the soot blowing ending time of the soot blower according to the average soot deposition thickness information of each sub-region;
starting the soot blower at the soot blowing starting moment, and controlling the soot blower to output steam with a preset soot blowing steam amount;
and when the soot blowing end time is reached, closing the soot blower.
In specific implementation, according to the average ash deposition thickness information of each sub-area, when the average ash deposition thickness information is larger than a first preset threshold value, the moment is determined as the ash blowing starting moment, when the average ash deposition thickness information is larger than a second preset threshold value, the moment is determined as the ash blowing ending moment, steam output is carried out at the ash blowing starting moment by using preset ash blowing steam quantity, and the ash blower is turned off at the ash blowing ending moment to end the ash blowing. The soot blowing is directly controlled through the average soot deposition thickness information of the subareas, the soot blowing control process is simplified, the situation that the actual optimization effect possibly deviates from the expectation due to complex theoretical calculation is avoided, and the workload and the economic loss caused by unreasonable optimization are reduced.
Wherein, the first predetermined threshold value can be set to be 2mm or set according to the actual situation; the second predetermined threshold may be set to 0mm, or may be set according to practical situations, which is not limited in this embodiment of the present invention.
Optionally, different soot blowing starting times and soot blowing ending times can be set according to different actual requirements of different utility boilers, so that the actual operation requirements of different utility boilers are met, and the operation benefits of the boilers are optimized.
Further, the method may further comprise the steps of:
when the soot blowing operation of the soot blower is finished, detecting updated soot thickness information of the sub-area;
adjusting the soot blowing steam amount based on the updated soot deposition thickness information.
In an optional embodiment of the invention, when the soot blowing operation of the soot blower is completed, that is, after the soot blower is turned off, the soot deposition thickness of the sub-region can be detected again, that is, the soot deposition thickness information is updated, so that the soot deposition thickness information can be fed back in time, and the soot blowing steam quantity is adjusted according to the updated soot deposition thickness information, so that the soot blower starting time is shortened, and the boiler operation benefit is improved.
In the embodiment of the invention, an infrared radiation image of the heated surface of the boiler is collected in real time through an infrared camera, and a first temperature value of the heated surface of the boiler and a second temperature value of the surface of an ash deposition layer on the wall of the boiler are calculated by adopting an infrared temperature measurement algorithm and the infrared radiation image; determining current soot deposition thickness information and a soot deposition area based on the first temperature value, the second temperature value and the heat conductivity coefficient; dividing the ash deposition area into a plurality of sub-areas, calculating the average ash deposition thickness information according to the current ash deposition thickness information in each sub-area, and controlling the soot blower to perform soot blowing operation on each sub-area. Therefore, an effective monitoring means for the pipe wall ash deposition and slagging state is provided, the ash blowing frequency and the ash blowing amount can be flexibly adjusted, the boiler efficiency is effectively improved, and the pipe explosion accident rate is reduced.
Referring to FIG. 3, FIG. 3 is a schematic diagram illustrating an installation of a soot blowing system for a heating surface of a coal-fired utility boiler in an embodiment of the present invention.
The system comprises a high-temperature superheater 1, an infrared camera 2, a cooling air pipeline 3, a network switch 4, a gigabit network cable 5, an industrial personal computer 6, a boiler furnace 7, a Distributed Control System (DCS)8 and a steam soot blower 9.
The infrared radiation image of the high-temperature superheater 1 is collected in real time through the infrared camera 2, the infrared radiation image is sent to the network switch 4 through the gigabit network cable 5, the network switch 4 is in data communication with the industrial personal computer 6 through the gigabit network cable 5, the industrial personal computer 6 is used for controlling parameters of the infrared camera 2 and analyzing the infrared radiation image, the ash deposition state of the heated surface of the high-temperature superheater 1 is obtained in real time and is subjected to brick mixing to form an analog quantity signal, and the analog quantity signal is accessed into the distributed control system 8 through an OPC (optical proximity correction) protocol to control the ash blowing steam quantity and the ash blowing period of the steam soot blower 9.
OPC (Object Linking and Embedding (OLE) for Process Control) is an application of Object Linking and Embedding technology of Microsoft corporation in Process Control. The OPC specification evolved from the OLE/COM/DCOM technology and established a unified standard in the C/S model for the development of object-oriented industrial automation software, in which a method for automated data exchange in real time between PC-based clients is defined.
The Distributed Control System (DCS) is a new-generation instrument Control System based on microprocessor and adopting the design principle of decentralized Control function, centralized display operation, and giving consideration to both branch and autonomy and comprehensive coordination
Referring to fig. 4, fig. 4 is a block diagram illustrating a soot blowing system for a heating surface of a coal-fired utility boiler according to an embodiment of the present invention.
The invention also provides a soot blowing system for the heating surface of the boiler of the coal-fired power plant, which relates to an infrared camera and a soot blower, and the system comprises:
the infrared radiation image acquisition module 401 is used for acquiring an infrared radiation image of the heating surface of the boiler in real time through the infrared camera;
a temperature value calculating module 402, configured to calculate a first temperature value of the heated surface of the boiler and a second temperature value of the surface of the soot layer of the heated surface of the boiler according to the infrared radiation image and a preset infrared temperature measurement algorithm;
a heating surface information determining module 403, configured to determine an ash deposition area and current ash deposition thickness information of the heating surface of the boiler based on the first temperature value, the second temperature value, and a preset heat conductivity coefficient;
an average soot deposition thickness information calculating module 404, configured to divide the soot deposition area into a plurality of sub-areas, and calculate average soot deposition thickness information of each sub-area according to the current soot deposition thickness information;
and a soot blowing operation executing module 405, configured to control the soot blower to perform a soot blowing operation on each of the sub-regions according to the average soot deposition thickness information of each of the sub-regions.
Optionally, a cooler is further involved, the infrared camera includes a camera and an infrared sensor, and the infrared radiation image collection module 401 includes:
the infrared radiation information acquisition submodule is used for acquiring the infrared radiation information of the heating surface of the boiler in real time through the camera and transmitting the infrared radiation information to the infrared sensor;
an infrared radiation image generation sub-module for generating the infrared radiation image based on the infrared radiation information by the infrared sensor;
the cooler is used for receiving compressed air, reducing the camera temperature of camera and sweeping the front end of camera.
Optionally, the heating surface information determining module 403 includes:
a difference determination submodule for determining a difference between the second temperature value and the first temperature value;
the current soot deposition thickness determining submodule is used for determining the current soot deposition thickness of the heating surface of the boiler by adopting the difference value and a preset heat conductivity coefficient;
and the ash deposition area determining submodule is used for determining an area in the infrared radiation image, which is equal to the second temperature value, as an ash deposition area of the heating surface of the boiler.
Optionally, the soot blowing operation performing module 405 includes:
the operation time determining submodule is used for determining the soot blowing starting time and the soot blowing ending time of the soot blower according to the average soot deposition thickness information of each sub-region;
the steam output control submodule is used for starting the soot blower at the soot blowing starting moment and controlling the soot blower to output steam with a preset soot blowing steam amount;
and the soot blower closing sub-module is used for closing the soot blower when the soot blowing end time is reached.
Optionally, the system further comprises:
the ash deposition thickness information updating detection module is used for detecting the updated ash deposition thickness information of the sub-area when the soot blowing operation of the soot blower is finished;
and the soot blowing steam amount modulation module is used for adjusting the soot blowing steam amount based on the updated soot deposition thickness information.
It is worth mentioning that the hardware can be connected with the network switch through the gigabit network cable, and the network switch is connected with the system through the gigabit network cable, so as to improve the data processing efficiency.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the system described above may refer to the corresponding process in the foregoing method embodiment, and is not described herein again.
In the embodiments provided in the present invention, it should be understood that the disclosed system and method can be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A soot blowing method for a heating surface of a coal-fired power plant boiler is characterized by relating to an infrared camera and a soot blower, and comprises the following steps:
acquiring an infrared radiation image of the heating surface of the boiler in real time through the infrared camera;
calculating a first temperature value of the heating surface of the boiler and a second temperature value of the surface of the soot layer of the heating surface of the boiler according to the infrared radiation image and a preset infrared temperature measurement algorithm;
determining the ash deposition area and the current ash deposition thickness information of the heating surface of the boiler based on the first temperature value, the second temperature value and a preset heat conductivity coefficient;
dividing the dust deposition area into a plurality of sub-areas according to a preset grid, and calculating the average dust deposition thickness information of each sub-area according to the current dust deposition thickness information and the area of the preset grid;
and controlling the soot blower to perform soot blowing operation on each sub-region according to the average soot deposition thickness information of each sub-region.
2. The method of claim 1, further comprising a cooler, wherein the infrared camera comprises a camera and an infrared sensor, and the step of acquiring the infrared radiation image of the heated surface of the boiler in real time through the infrared camera comprises the following steps:
acquiring infrared radiation information of the heated surface of the boiler in real time through the camera and transmitting the infrared radiation information to the infrared sensor;
generating, by the infrared sensor, the infrared radiation image based on the infrared radiation information;
the cooler is used for receiving compressed air, reducing the camera temperature of camera and sweeping the front end of camera.
3. The method of claim 1, wherein the step of determining the ash deposition area and the current ash deposition thickness of the boiler heating surface based on the first temperature value, the second temperature value and a preset thermal conductivity comprises:
determining a difference between the second temperature value and the first temperature value;
determining the current accumulated ash thickness of the heating surface of the boiler by adopting the difference and a preset heat conductivity coefficient;
and determining the area in the infrared radiation image equal to the second temperature value as the ash deposition area of the heating surface of the boiler.
4. The method of claim 1, wherein the step of controlling the soot blowers to perform a soot blowing operation on each of the sub-regions based on the average soot deposition thickness information for each of the sub-regions comprises:
determining the soot blowing starting time and the soot blowing ending time of the soot blower according to the average soot deposition thickness information of each sub-region;
starting the soot blower at the soot blowing starting moment, and controlling the soot blower to output steam with a preset soot blowing steam amount;
and when the soot blowing end time is reached, closing the soot blower.
5. The method of claim 4, further comprising:
when the soot blowing operation of the soot blower is finished, detecting updated soot thickness information of the sub-area;
adjusting the soot blowing steam amount based on the updated soot deposition thickness information.
6. The utility model provides a coal fired power plant boiler heating surface soot blowing system which relates to infrared camera and soot blower, the system includes:
the infrared radiation image acquisition module is used for acquiring an infrared radiation image of the heating surface of the boiler in real time through the infrared camera;
the temperature value calculation module is used for calculating a first temperature value of the heating surface of the boiler and a second temperature value of the surface of the soot layer of the heating surface of the boiler according to the infrared radiation image and a preset infrared temperature measurement algorithm;
the heating surface information determining module is used for determining the ash deposition area and the current ash deposition thickness information of the heating surface of the boiler based on the first temperature value, the second temperature value and a preset heat conductivity coefficient;
the average dust deposition thickness information calculation module is used for dividing the dust deposition area into a plurality of sub-areas according to a preset grid and calculating the average dust deposition thickness information of each sub-area according to the current dust deposition thickness information and the area of the preset grid;
and the soot blowing operation execution module is used for controlling the soot blower to execute soot blowing operation on each sub-region according to the average soot deposition thickness information of each sub-region.
7. The system of claim 6, further comprising a cooler, the infrared camera comprising a camera and an infrared sensor, the infrared radiation image acquisition module comprising:
the infrared radiation information acquisition submodule is used for acquiring the infrared radiation information of the heating surface of the boiler in real time through the camera and transmitting the infrared radiation information to the infrared sensor;
an infrared radiation image generation sub-module for generating the infrared radiation image based on the infrared radiation information by the infrared sensor;
the cooler is used for receiving compressed air, reducing the camera temperature of camera and sweeping the front end of camera.
8. The system of claim 6, wherein the heating surface information determination module comprises:
a difference determination submodule for determining a difference between the second temperature value and the first temperature value;
the current soot deposition thickness determining submodule is used for determining the current soot deposition thickness of the heating surface of the boiler by adopting the difference value and a preset heat conductivity coefficient;
and the ash deposition area determining submodule is used for determining an area in the infrared radiation image, which is equal to the second temperature value, as an ash deposition area of the heating surface of the boiler.
9. The system of claim 6, wherein the soot blowing operation performing module comprises:
the operation time determining submodule is used for determining the soot blowing starting time and the soot blowing ending time of the soot blower according to the average soot deposition thickness information of each sub-region;
the steam output control submodule is used for starting the soot blower at the soot blowing starting moment and controlling the soot blower to output steam with a preset soot blowing steam amount;
and the soot blower closing sub-module is used for closing the soot blower when the soot blowing end time is reached.
10. The system of claim 9, further comprising:
the ash deposition thickness information updating detection module is used for detecting the updated ash deposition thickness information of the sub-area when the soot blowing operation of the soot blower is finished;
and the soot blowing steam amount modulation module is used for adjusting the soot blowing steam amount based on the updated soot deposition thickness information.
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| CN114440205A (en) * | 2022-03-11 | 2022-05-06 | 国家能源集团山西电力有限公司 | Safety diagnosis system and method for heating surface of boiler system |
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