CN113847611A - Power station boiler furnace intelligent soot blowing system and method based on online monitoring of inner wall temperature of furnace - Google Patents
Power station boiler furnace intelligent soot blowing system and method based on online monitoring of inner wall temperature of furnace Download PDFInfo
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- CN113847611A CN113847611A CN202110949887.9A CN202110949887A CN113847611A CN 113847611 A CN113847611 A CN 113847611A CN 202110949887 A CN202110949887 A CN 202110949887A CN 113847611 A CN113847611 A CN 113847611A
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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
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
- F23J1/06—Mechanically-operated devices, e.g. clinker pushers
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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
- F23J3/02—Cleaning furnace tubes; Cleaning flues or chimneys
- F23J3/023—Cleaning furnace tubes; Cleaning flues or chimneys cleaning the fireside of watertubes in boilers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M11/00—Safety arrangements
- F23M11/04—Means for supervising combustion, e.g. windows
- F23M11/045—Means for supervising combustion, e.g. windows by observing the flame
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
- F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples
- F23N5/102—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples using electronic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/08—Measuring temperature
Abstract
The invention discloses a power station boiler furnace intelligent soot blowing system and a method based on furnace inner wall temperature online monitoring, wherein the power station boiler furnace intelligent soot blowing system comprises the following steps: the boiler heating surface consists of water wall tubes, fins and fire observation holes; the high-temperature resistant rotary measuring gun can extend into the hearth of the power station boiler through the fire observation hole and is used for observing the contamination and slagging conditions on the heating surface of the hearth of the boiler; the furnace hearth inner wall temperature measuring module is used for continuously monitoring the inner wall temperature of the heating surface of the boiler hearth; the temperature acquisition and conversion module is used for receiving the signals acquired by the hearth inner wall temperature measurement module, converting the signals into digital signals and then sending the digital signals to the industrial personal computer; the industrial personal computer is used for receiving the signals of the temperature acquisition and conversion module and sending control instructions to the hearth wall type soot blower; and the hearth wall type soot blower is used for performing soot blowing action after receiving a control command of the industrial personal computer. The intelligent on-demand operation of each hearth wall type soot blower can be realized according to the soot deposition or slagging condition of the local position of the heating surface of the hearth of the power station boiler.
Description
Technical Field
The invention belongs to the technical field of power station boilers, and particularly relates to a power station boiler furnace intelligent soot blowing system and method based on online monitoring of furnace inner wall temperature.
Background
During the combustion of solid fuel in the boiler, partial ash forms molten or semi-molten particles, which are carried by flue gas before solidification to collide with the furnace wall, water wall or high-temperature section superheater and adhere to the surface of the furnace wall, and the coke is formed after cooling and solidification. The slag block formed by slagging is mainly sticky or molten precipitate and mainly appears on the radiation heating surface of the boiler, so that the heat transfer capacity of the heating surface in the boiler is reduced. In order to avoid heat transfer deterioration, a soot blower is mostly adopted to blow the slag block on the heating surface, and the heating surface is kept clean.
For example, chinese patent publication No. CN213395373U discloses a combined soot blowing structure for a boiler, which includes a furnace body, and both the front side wall and the rear side wall of the furnace body are provided with steam soot blowers. Chinese patent publication No. CN212456914U discloses an accurate soot blowing system for eliminating a blowing blind area, in which a boiler is provided with a hood-type steam soot blower in cooperation with an existing steam soot blower to form a steam soot blowing system capable of accurately blowing the blind area. However, when the soot blower is used, although the heat exchange efficiency of the boiler can be improved, a large amount of high-quality steam is consumed, and the loss of the soot blower and the loss of the heating surface are increased, so that the economical efficiency can be improved by effectively using the soot blower. Because the high-temperature and high-ash severe environment generated by violent combustion of solid fuel in a hearth in the operation process of a boiler has difficulty in monitoring the slagging state of the surface of a water-cooled wall of the hearth for a long time, the slagging state of the water-cooled wall of a local area on the large-area water-cooled wall in the boiler is difficult to monitor, and the overall pollution condition of the whole hearth can be indirectly reflected only through the smoke temperature of a hearth outlet, steam parameters of the hearth outlet and the like, so that the current soot blowing of the heating surface of the hearth usually carries out periodic soot blowing by taking the hearth as a whole, and obviously cannot meet the requirement of intelligent and accurate soot blowing aiming at the local slagging condition of the heating surface of the hearth.
Disclosure of Invention
The invention provides a power station boiler furnace intelligent soot blowing system and method based on online monitoring of furnace inner wall temperature, which can realize intelligent application of each furnace wall type soot blower and improve the safety and the economical efficiency of boiler operation.
The utility model provides a power plant boiler furnace intelligence soot blowing system based on wall temperature on-line monitoring in furnace, includes:
the heating surface of the power station boiler hearth consists of water wall tubes, fins and fire observation holes;
the high-temperature-resistant rotary measuring gun extends into the hearth through a fire observation hole arranged on the heating surface of the hearth of the power station boiler, is used for observing the contamination and slagging conditions on the heating surface of the hearth of the power station boiler and is used for verifying the temperature data measured by the hearth inner wall temperature measuring module;
the furnace hearth inner wall temperature measuring module is arranged on the fins between the water cooling wall tubes of the heating surface of the furnace hearth and is used for continuously measuring the inner wall temperature of the heating surface of the furnace hearth of the boiler;
the temperature acquisition and conversion module is respectively connected with the hearth inner wall temperature measurement module and the industrial personal computer and is used for receiving the temperature signal acquired by the hearth inner wall temperature measurement module and transmitting the temperature signal to the industrial personal computer after conversion;
the industrial personal computer is respectively connected with the temperature acquisition and conversion module and each furnace wall type soot blower and is used for receiving the signal of the temperature acquisition and conversion module and sending a control instruction to each furnace wall type soot blower;
and the hearth wall type soot blower is connected with the industrial personal computer and is used for blowing off slag blocks on the heating surface after receiving a control command of the industrial personal computer.
Furthermore, the furnace inner wall temperature measuring module comprises an in-furnace heat collection block, an out-furnace fixing block and an armored thermocouple; the in-furnace heat collection block is fixed on the inner side surface of a fin hearth between 2 adjacent hearth water-cooled walls of the power station boiler, and a thermocouple installation measuring point is arranged in the in-furnace heat collection block; the fixed block outside the furnace is fixed on the surface of the outer side of the hearth of the fin at the same position as the heat collecting block in the furnace, the fin and the fixed block outside the furnace are provided with a thermocouple mounting hole which penetrates through the fixed block outside the furnace, and the measuring end of the armored thermocouple is inserted into a thermocouple mounting measuring point of the heat collecting block in the furnace through the thermocouple mounting hole.
In order to obtain the slagging condition of the heating surface of the hearth near the temperature measuring module of the inner wall of the hearth, the high-temperature resistant rotary vision gun extends into the hearth through the fire observation hole on the hearth, rotatably observes the slagging condition on the heating surface of the hearth near the temperature measuring module of the inner wall of the hearth, and shoots to obtain the slagging condition image on the heating surface of the hearth.
Furthermore, in order to quantify the slagging condition image on the heating surface of the hearth, the shot image is subjected to image processing, the color value of each pixel of the image is identified by utilizing the difference between the colors of the metal and the slagging of the heating surface on the water-cooled wall in the hearth, and the quantitative data of the slagging proportion of the image is obtained.
Under the combined action of radiant heat exchange of a boiler hearth and flowing heat exchange of working media in a water wall tube, the temperature on the heating surface of the boiler hearth is in relative balance, after ash or slag is accumulated on the heating surface of the boiler hearth, the temperature of a hearth inner wall temperature monitoring module is reduced along with the increase of the thickness of the slag, and therefore, a mathematical model of the slag bonding degree and the inner wall temperature is constructed according to quantitative data of the slag bonding proportion of the heating surface near the hearth inner wall temperature measuring module monitored by a high-temperature-resistant rotary measuring gun and the measured temperature of the hearth inner wall temperature measuring module, and the mathematical model is used as a basis for the subsequent soot blower.
In order to reduce the working temperature of the thermocouple in the furnace chamber wall temperature measuring module, preferably, two sides of the in-furnace heat collection block and the out-furnace fixed block are respectively provided with an arc contact surface which is the same as the outer surfaces of the water wall tubes at two sides, and the arc contact surfaces are tightly attached to the outer surfaces of the water wall tubes.
In order to ensure the fitting degree of the radians of the outer surfaces of the heat collection block in the furnace and the water wall pipes on the two sides during installation, internal threads are arranged on the heat collection block in the furnace, when the heat collection block is installed, a bolt firstly extends into the furnace through an armored thermocouple installation hole penetrating through a fin and is connected with the internal threads arranged on the heat collection block in the furnace, and the heat collection block in the furnace is tightened by matching of the threads from the outside of the furnace. By increasing the contact area of the heat collection block and the water wall pipe in the furnace, the temperature of the heat collection block and the armored thermocouple is reduced by utilizing the flow of the working medium in the water wall, and the service life is prolonged.
Furthermore, a slit for heating expansion of the heat collection block in the furnace is arranged between the thermocouple installation measuring point and the arc contact surface of the heat collection block in the furnace, so that the fitting degree of the heat collection block in the furnace and a water cooling wall is improved on one hand, and a margin is provided for the heating expansion of the heat collection block in the furnace on the other hand.
In order to avoid direct welding on the pressure-bearing water wall tube, the heat collecting block in the furnace is welded and fixed with the inner sides of the fins through the welding block arranged at the lower end of the heat collecting block in the furnace, and the fixed block outside the furnace is welded and fixed with the outer sides of the fins through the welding block arranged at the upper end of the fixed block outside the furnace.
In order to facilitate later-stage replacement of the armored thermocouple, internal threads are arranged in the thermocouple mounting hole of the fixing block outside the furnace and connected with the external threads of the thermocouple fixing sleeve, and the armored thermocouple is detachably fixed through the thermocouple fixing sleeve.
The thermocouple fixing sleeve is fixed in a thermocouple mounting hole on a fixed block outside the furnace through threads, the armored thermocouple is inserted into a thermocouple mounting point of the heat collection block inside the furnace from the outside of the furnace through a fixing sleeve through hole, a thermocouple mounting hole of the heat collection block outside the furnace and a thermocouple mounting hole on the fin, and the armored thermocouple is detachably fixed through the thermocouple fixing sleeve. When the armored thermocouple is damaged, the thermocouple fixing sleeve can be detached to complete replacement of the armored thermocouple in the hot-state operation state of the boiler.
And arranging a temperature acquisition and conversion module, converting an analog signal of each furnace inner wall temperature measurement module arranged on the hearth of the power station boiler into a digital signal, and transmitting the digital signal to an industrial personal computer of a power plant control room.
In order to realize intelligent soot blowing of the furnace wall type soot blower according to the requirement of the slagging degree, preferably, the industrial personal computer controls the operation of the furnace wall type soot blower according to the temperature of the furnace inner wall temperature measuring module near each furnace wall type soot blower. And when the temperature of the furnace inner wall temperature measuring module is lower than a set threshold value, automatically applying the corresponding furnace wall type soot blower.
The invention also provides a power station boiler furnace intelligent soot blowing method based on the online monitoring of the temperature of the inner wall of the furnace, and the intelligent soot blowing system of the boiler comprises the following steps:
(1) installing furnace inner wall temperature measuring modules on furnace heating surfaces at different positions in the power station boiler, and continuously collecting the furnace inner wall temperature of each measuring module; (ii) a
(2) Extending a high-temperature-resistant rotary measuring gun into the hearth through a fire observation hole on the hearth, observing the ash deposition and slagging conditions on the surface of the heating surface of the hearth at different positions, and carrying out image processing on a shot image to obtain quantitative data of the ash deposition or slagging proportion of the heating surface of the hearth;
(4) constructing a mathematical model of the slagging degree of the heating surface of the hearth and the inner wall temperature of the hearth according to quantitative data of the deposition or slagging proportion of the heating surface of the hearth, which is obtained by a high-temperature-resistant rotary measuring gun, and the inner wall temperature of the hearth, which is continuously collected by a measuring module of the inner wall temperature of the hearth;
(5) based on the constructed mathematical model, establishing an algorithm of soot blowing requirements of a heating surface of a hearth, setting a temperature threshold value of operation of the wall type soot blower, and controlling the operation of the wall type soot blower of the corresponding hearth by an industrial personal computer according to real-time monitoring data of the temperature of the inner wall of the hearth;
(6) the method comprises the steps of monitoring a high-temperature-resistant rotary measuring gun of each furnace wall type soot blower and measuring the temperature of the inner wall of a furnace, establishing a mathematical model of each furnace wall type soot blower, and intelligently blowing soot of each furnace wall type soot blower according to the actual slagging condition of the heating surface of a local area of the furnace wall type soot blower according to needs.
In order to realize the automatic operation of the intelligent soot blowing system, in the step (4), a mathematical model of the slagging degree of the heating surface of the hearth and the temperature of the inner wall of the hearth is calculated and constructed for multiple times and is used for judging whether the wall type soot blower of the hearth is operated or not.
In the step (5), after ash or slag is accumulated on the heated surface of the hearth, the temperature of the inner wall of the hearth measured by the temperature measuring module at the inner wall of the hearth is reduced due to the increase of the thermal resistance, and the industrial personal computer automatically puts in the hearth wall type soot blower at the corresponding position after monitoring that the temperature of the inner wall of a certain hearth is lower than a set threshold value.
The device and the method can construct a mathematical model of the slagging degree of the heating surface of the hearth and the temperature of the inner wall of the hearth, so that the slagging thickness of the local heating surface at different positions of the hearth can be obtained by back-deriving according to the temperature data of the inner wall of the hearth at different positions of the hearth monitored in real time, the intelligent application of each hearth wall soot blower is realized by controlling the soot blowing action of the hearth wall soot blower at the corresponding position, and the on-demand and accurate soot blowing of the hearth wall soot blowers is realized.
Drawings
FIG. 1 is a layout diagram of an intelligent soot blowing system of a boiler furnace of a power station based on-line monitoring of the temperature of the inner wall of the furnace;
FIG. 2 is a structural diagram of a furnace inner wall temperature measuring module in the embodiment of the invention.
FIG. 3 shows the temperature variation of the inner wall of the furnace chamber measured by the module for measuring the temperature of the inner wall of the furnace chamber.
FIG. 4 is a surface image of a hearth heating surface observed by the high temperature resistant rotary measuring gun of the invention.
FIG. 5 is a relation between the local position slagging proportion obtained by the high temperature resistant rotary measuring gun of the invention and the temperature of the hearth inner wall temperature measuring module.
Detailed Description
The invention will be described in further detail below with reference to the drawings and examples, which are intended to facilitate the understanding of the invention without limiting it in any way.
As shown in the figures 1 and 2, the intelligent soot blowing system for the boiler furnace of the power station based on the online monitoring of the temperature of the inner wall of the furnace comprises a heating surface of the boiler furnace, a high-temperature-resistant rotary measuring gun 3, a furnace inner wall temperature measuring module 4, a furnace wall type soot blower 5, a temperature acquisition and conversion module 6 and an industrial personal computer 7. The boiler furnace heating surface comprises water wall tubes 101, fins 102 and fire observation holes 103. The heating surface is bonded with the slag 2, and high-temperature molten ash particles generated when solid fuel in the boiler is burnt are adhered to the heating surface to cause heat transfer deterioration.
Specifically, the heating surface of the boiler hearth is used for receiving heat released by combustion in the boiler; the high-temperature-resistant rotary measuring gun 3 is used for observing the slagging condition of the heating surface of the hearth in the thermal state operation process of the boiler; the hearth inner wall temperature measuring module 4 is used for continuously monitoring the inner wall temperature of a heating surface of the hearth for a long time; the hearth wall type soot blower 5 runs intermittently and is used for removing slag on the heating surface of the hearth; the temperature acquisition and conversion module 6 is used for converting the analog signal of the armored thermocouple into a digital signal for remote transmission; and the industrial personal computer 7 calculates and analyzes the slagging condition of different local positions of the heating surface of the hearth according to the temperature of each heating surface wall temperature measuring module of the hearth, and remotely controls the application of the hearth wall type soot blower.
In order to obtain the slagging condition of the heating surface of the hearth near the inner wall temperature measuring module of the hearth, the high-temperature resistant rotary measuring gun 3 extends into the fire observation hole 103 of the hearth, the slagging condition of the water-cooled wall of the hearth near the wall temperature measuring module 4 is monitored, an image of the slagging condition is obtained by shooting, and through image processing, the color value of each pixel of the image is identified by utilizing the difference of the colors of metal and slagging of the heating surface on the water-cooled wall in the hearth, so that the quantitative data of the slagging proportion of the image is obtained.
After slagging on the heating surface of the boiler hearth, the temperature of the hearth inner wall temperature monitoring module 4 is reduced along with the increase of the slagging thickness due to the increase of heat transfer resistance. The high-temperature-resistant rotary measuring gun 3 and the hearth inner wall temperature measuring module 4 are adopted for continuous monitoring, and a mathematical model of the slagging degree and the inner wall temperature is constructed according to the quantitative data of the slagging proportion of the hearth water-cooled wall monitored by the high-temperature-resistant rotary measuring gun 3 and the temperature of the hearth inner wall temperature measuring module 4 and is used as the basis for the subsequent hearth wall type soot blower 5.
As shown in FIG. 2, the furnace inner wall temperature measuring module 4 includes an in-furnace heat collection block 401, an out-furnace fixing block 402, a thermocouple fixing sleeve 407, and a sheathed thermocouple 408. The in-furnace heat collection block 401 is fixed on the inner side surface of the furnace cavity of the fin 102 between the water walls of 2 adjacent furnace cavities of the utility boiler, and a thermocouple installation measuring point 404 is arranged in the in-furnace heat collection block 401; the outer fixing block 402 is fixed on the outer side surface of the furnace chamber of the fin 102 at the same position as the heat collecting block in the furnace. The fins 102 and the outer fixing block 402 are provided with thermocouple mounting holes which penetrate through the thermocouple mounting holes, a thermocouple fixing sleeve 407 is fixed in the thermocouple mounting holes through threads, the armored thermocouple 408 is detachably fixed in the thermocouple fixing sleeve 407, and the measuring end of the armored thermocouple 408 is positioned in a thermocouple mounting measuring point 404 of the heat collection block 401 in the furnace. When the armored thermocouple 408 is damaged, the replacement of the armored thermocouple can be completed by detaching the thermocouple fixing sleeve in the operating state of the boiler.
The two sides of the furnace heat collection block 401 and the furnace outer fixing block 402 are both provided with arc contact surfaces 403 which are consistent with the outer surfaces of the water wall tubes 101 at the two sides, and the arc contact surfaces 403 are tightly attached to the outer surfaces of the water wall tubes 101. The contact area of the heat collection block 401 in the furnace and the water wall tube 101 is increased, and the temperature of the heat collection block is reduced by utilizing the working medium flowing in the water wall tube.
The slits 405 are further formed on the heat collection block 401 in the furnace, so that the arc contact surface 403 has a certain deformation, the fitting degree of the heat collection block 401 in the furnace and the water wall tube 101 is further improved, and meanwhile, the thermal expansion allowance of the heat collection block 401 in the furnace at the high combustion temperature of the boiler is provided.
In order to avoid welding the in-furnace heat collection block 401 and the out-furnace fixing block 402 with the pressure-containing member water wall tube 101, a convex welding block 406 is arranged on one side of the in-furnace heat collection block 401 and the out-furnace fixing block close to the fin 102, and the in-furnace heat collection block 401 and the out-furnace fixing block 402 are welded with the fin 102 through the welding block 406.
In order to ensure the joint degree of the heat collection block 401 and the water wall tube 101 in the furnace during installation, internal threads are arranged on the heat collection block 401 in the furnace, the heat collection block passes through the thermocouple installation holes penetrating through the fixing block 402 and the fins 102 outside the furnace through bolts during installation and is fixed with the internal threads on the heat collection block 401, the heat collection block 401 in the furnace is tightened by matching of the threads outside the furnace so as to be tightly adhered to the fins 102 as much as possible, and then welding is carried out.
As the number of the furnace inner wall temperature measuring modules 4 arranged on the heating surface of the furnace is large, in order to reduce the number of the armored thermocouple compensation wires, the temperature acquisition and conversion module 6 is arranged on the spot, and the analog signals of all the armored thermocouples 408 are converted into digital signals to be transmitted to the industrial personal computer 7 of the control room.
Specifically, the intelligent soot blowing method for the boiler furnace of the power station based on the online monitoring of the temperature of the inner wall of the furnace comprises the following steps:
(1) and installing hearth inner wall temperature measuring modules 4 on hearth heating surfaces at different positions in the power station boiler, and continuously acquiring the hearth inner wall temperature at each hearth inner wall temperature measuring module 4.
As shown in fig. 3, the temperature of the measurement point of the temperature of the inner wall of the furnace chamber periodically fluctuates with the soot blowing of the wall soot blower 5 of the furnace chamber, after the soot blowing of the wall soot blower 5 of the furnace chamber, the temperature of the measurement module 4 of the temperature of the inner wall of the furnace chamber rapidly rises because the slag 2 on the surface of the heating surface of the furnace chamber is removed, the heat transfer resistance between the furnace chamber and the heating surface of the furnace chamber disappears, the molten particles of the solid fuel gradually adhere to the heating surface to form the slag 2 again with the continuous operation of the boiler, the heat transfer resistance between the furnace chamber and the heating surface of the furnace chamber gradually increases, and the temperature of the measurement module 4 of the temperature of the inner wall of the furnace chamber slowly decreases.
(2) And (3) extending the high-temperature-resistant rotary measuring gun 3 into the hearth through a fire observation hole 103 on the hearth, observing the surface ash deposition and slagging conditions of the heating surface of the hearth at different positions, and performing image processing on the shot image to obtain quantitative data of the slagging proportion of the heating surface of the hearth.
Fig. 4 is quantitative data of the ash deposition or slag bonding ratio of the heated surface of the hearth, which is obtained by observing the surface image of the heated surface of the hearth by the high-temperature-resistant rotary measuring gun 3, and the ash deposition or slag bonding ratio of the heated surface of the hearth obtained by image processing gradually increases with the increase of the ash deposition or slag bonding on the surface of the heated surface of the hearth.
(4) And constructing a mathematical model of the slagging proportion of the heating surface of the hearth and the inner wall temperature of the hearth according to quantitative data of the slagging proportion of the heating surface of the hearth, which are obtained by continuously measuring the high-temperature resistant rotary measuring gun 3 for multiple times, and the inner wall temperature of the hearth, which is continuously acquired by the inner wall temperature measuring module 4.
Fig. 5 is a relationship between quantitative data of a position slagging proportion of a certain part of a heating surface of a hearth obtained by a high temperature resistant rotary measuring gun 3 on a certain 330MW coal-fired boiler and data of inner wall temperature of the hearth measured by a hearth inner wall temperature measuring module 4 installed at the position, and a fitting relational expression of a temperature Y of a temperature measuring point of the inner wall of the hearth and the slagging proportion X of the heating surface of the hearth obtained by fitting is as follows:
(5) based on the mathematical model, an algorithm of the soot blowing requirements of the heating surface of the hearth is established, the operation temperature threshold of the wall type soot blower 5 is set, if the slag bonding proportion of the heating surface of the hearth reaches 80 percent, the judgment condition of the soot blowing of the hearth is set, and the corresponding inner wall temperature of the hearth is calculated and obtained to be 432.9 ℃ according to the mathematical model. After the hearth is heated and slagging is carried out, the industrial personal computer 7 monitors data in real time according to the temperature of the inner wall of the hearth, and when the temperature of the inner wall of the hearth is reduced to 432.9 ℃, the operation of the corresponding hearth wall type soot blower 5 is started.
(6) The method comprises the steps of monitoring a high-temperature-resistant rotary measuring gun 3 and measuring a furnace inner wall temperature measuring module 4 for each furnace wall type soot blower 5, establishing a mathematical model of each furnace wall type soot blower 5, obtaining respective temperature threshold values according to calculation, and intelligently blowing soot for each furnace wall type soot blower according to actual slagging conditions of a heating surface of a local area of each furnace wall type soot blower according to needs.
The embodiments described above are intended to illustrate the technical solutions and advantages of the present invention, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, additions and equivalents made within the scope of the principles of the present invention should be included in the scope of the present invention.
Claims (8)
1. The utility model provides a power plant boiler furnace intelligence soot blowing system based on wall temperature on-line monitoring in furnace which characterized in that includes:
the heating surface of the power station boiler hearth consists of water wall tubes, fins and fire observation holes;
the high-temperature-resistant rotary measuring gun extends into the hearth through a fire observation hole arranged on the heating surface of the hearth of the power station boiler, is used for observing the contamination and slagging conditions on the heating surface of the hearth of the power station boiler and is used for verifying the temperature data measured by the hearth inner wall temperature measuring module;
the furnace hearth inner wall temperature measuring module is arranged on the fins between the water cooling wall tubes of the heating surface of the furnace hearth and is used for continuously measuring the inner wall temperature of the heating surface of the furnace hearth of the boiler;
the temperature acquisition and conversion module is respectively connected with the hearth inner wall temperature measurement module and the industrial personal computer and is used for receiving the temperature signal acquired by the hearth inner wall temperature measurement module and transmitting the temperature signal to the industrial personal computer after conversion;
the industrial personal computer is respectively connected with the temperature acquisition and conversion module and each furnace wall type soot blower and is used for receiving the signal of the temperature acquisition and conversion module and sending a control instruction to each furnace wall type soot blower;
and the hearth wall type soot blower is connected with the industrial personal computer and is used for blowing off slag blocks on the heating surface after receiving a control command of the industrial personal computer.
2. The intelligent soot blowing system of the furnace chamber of the utility boiler based on the on-line monitoring of the temperature of the inner wall of the furnace chamber as claimed in claim 1, wherein the measuring module of the temperature of the inner wall of the furnace chamber comprises a heat collecting block in the furnace, a fixing block outside the furnace and an armored thermocouple;
the in-furnace heat collection block is fixed on the inner side surface of a fin hearth between 2 adjacent hearth water-cooled walls of the power station boiler, and a thermocouple installation measuring point is arranged in the in-furnace heat collection block; the fixed block outside the furnace is fixed on the surface of the outer side of the hearth of the fin at the same position as the heat collecting block in the furnace, the fin and the fixed block outside the furnace are provided with a thermocouple mounting hole which penetrates through the fixed block outside the furnace, and the measuring end of the armored thermocouple is inserted into a thermocouple mounting measuring point of the heat collecting block in the furnace through the thermocouple mounting hole.
3. The intelligent soot blowing system for the furnace of the utility boiler based on the online monitoring of the temperature of the inner wall of the furnace as claimed in claim 2, wherein the two sides of the internal heat collection block and the external fixed block are provided with arc contact surfaces identical to the outer surfaces of the water wall tubes at the two sides, and the arc contact surfaces are closely attached to the outer surfaces of the water wall tubes.
4. The intelligent boiler furnace soot-blowing system based on the online monitoring of the temperature of the inner wall of the furnace as claimed in claim 3, wherein the heat collection block in the furnace is provided with a slit between the thermocouple installation point and the arc contact surface for the heat collection block in the furnace to expand when heated.
5. The intelligent boiler furnace soot blowing system based on online monitoring of the temperature of the inner wall of the furnace as claimed in claim 2, wherein the heat collecting block in the furnace is welded and fixed with the inner sides of the fins through a welding block arranged at the lower end of the heat collecting block in the furnace, and the fixing block outside the furnace is welded and fixed with the outer sides of the fins through a welding block arranged at the upper end of the fixing block outside the furnace.
6. The boiler furnace intelligent soot blowing system based on online monitoring of the temperature of the inner wall of the furnace as claimed in claim 2, wherein the thermocouple mounting hole of the fixed block outside the furnace is internally threaded and connected with the external thread of the thermocouple fixing sleeve, and the armored thermocouple is detachably fixed by the thermocouple fixing sleeve.
7. A power station boiler furnace intelligent soot blowing method based on online monitoring of inner wall temperature of a furnace is characterized in that the power station boiler furnace intelligent soot blowing system of any one of claims 1-6 is used, and the method comprises the following steps:
(1) installing furnace inner wall temperature measuring modules on furnace heating surfaces at different positions in the power station boiler, and continuously collecting the furnace inner wall temperature of each measuring module;
(2) extending a high-temperature-resistant rotary measuring gun into the hearth through a fire observation hole on the hearth, observing the ash deposition and slagging conditions on the surface of the heating surface of the hearth at different positions, and carrying out image processing on a shot image to obtain quantitative data of the ash deposition or slagging proportion of the heating surface of the hearth;
(4) constructing a mathematical model of the slagging degree of the heating surface of the hearth and the inner wall temperature of the hearth according to quantitative data of the deposition or slagging proportion of the heating surface of the hearth, which is obtained by a high-temperature-resistant rotary measuring gun, and the inner wall temperature of the hearth, which is continuously collected by a measuring module of the inner wall temperature of the hearth;
(5) based on the constructed mathematical model, establishing an algorithm of soot blowing requirements of a heating surface of a hearth, setting a temperature threshold value of operation of the wall type soot blower, and controlling the operation of the wall type soot blower of the corresponding hearth by an industrial personal computer according to real-time monitoring data of the temperature of the inner wall of the hearth;
(6) the method comprises the steps of monitoring a high-temperature-resistant rotary measuring gun of each furnace wall type soot blower and measuring the temperature of the inner wall of a furnace, establishing a mathematical model of each furnace wall type soot blower, and intelligently blowing soot of each furnace wall type soot blower according to the actual slagging condition of a heating surface of a local area of each furnace wall type soot blower according to needs.
8. The intelligent soot blowing method for the boiler furnace of the utility model based on the on-line monitoring of the temperature of the inner wall of the furnace hearth according to the claim 7, characterized in that in the step (5), after the heated area of the furnace hearth is soot-accumulated or slag-bonded, the temperature of the inner wall of the furnace hearth measured by the temperature measuring module of the inner wall of the furnace hearth is reduced due to the increase of the thermal resistance, and the industrial personal computer automatically applies the wall type soot blower of the furnace hearth at the corresponding position after monitoring that the temperature of the inner wall of a certain furnace hearth is lower than the set threshold value.
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