CN112429856A - Boiler heating surface scaling monitoring system and method - Google Patents
Boiler heating surface scaling monitoring system and method Download PDFInfo
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- CN112429856A CN112429856A CN202011315172.XA CN202011315172A CN112429856A CN 112429856 A CN112429856 A CN 112429856A CN 202011315172 A CN202011315172 A CN 202011315172A CN 112429856 A CN112429856 A CN 112429856A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 48
- 238000012544 monitoring process Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000000126 substance Substances 0.000 claims abstract description 20
- 238000012806 monitoring device Methods 0.000 claims abstract description 11
- 230000008859 change Effects 0.000 claims abstract description 8
- 238000009529 body temperature measurement Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 3
- 238000004880 explosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 5
- 238000012546 transfer Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 235000013980 iron oxide Nutrition 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/001—Upstream control, i.e. monitoring for predictive control
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
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Abstract
The invention discloses a system and a method for monitoring scaling of a heating surface of a boiler. The signal processor calculates the heat flow passing through the unit length of the pipe wall and the pipe wall scale amount, adjusts the chemical water treatment device according to the pipe wall scale amount, monitors the water quality entering the furnace through the water quality monitoring device, and achieves the purposes of monitoring the scale amount of a heated surface in real time and optimizing and adjusting the water quality entering the furnace. The invention measures the amount of the heated surface scale by measuring the wall temperature of the tube to obtain the heat flow of unit length, realizes the online real-time monitoring of the amount of the heated surface scale, optimally adjusts the chemical water treatment device according to the amount of the heated surface scale to change the water quality entering the furnace, reduces the scaling rate of the heated surface, improves the heat exchange capacity of the heated surface, prevents the heated surface from being corroded under the scale to cause overtemperature tube explosion, and ensures the safe, economic and stable operation of the unit.
Description
Technical Field
The invention belongs to the technical field of monitoring of coal-fired power plant equipment, and relates to a system and a method for monitoring scaling of a heating surface of a boiler.
Background
The boiler is one of important thermal equipment of a thermal power plant, and the scaling of a heating surface is an important factor influencing the health condition of the boiler. During the long-term operation of the boiler, silicon dioxide and iron oxides in the boiler water still deposit on the inner surface of the heating surface of the boiler to form scale due to the continuous evaporation and concentration of the boiler water. The steam quality of a large amount of thermal power plants is counted and then found, although the qualification rate of the steam quality of some power plants is very high, the serious scaling condition of the heating surface of the boiler is still found when the unit is overhauled and checked, and even if the steam quality reaches the standard value requirement, the scaling risk of the heating surface of the boiler cannot be avoided.
The heat transfer efficiency is reduced due to scaling of the heating surface, the heat transfer effect is influenced, and the heat transfer efficiency is reduced by more than 5% according to estimation when the thickness of the scale on the heating surface of the boiler is increased by 1 mm. The existence of the scale can increase the temperature of the heated surface, and the metal is overheated to generate creep deformation, thereby causing the metal to bulge and even explode, and seriously affecting the safe operation of the boiler. Scaling of the heating surface can also cause under-scale corrosion, once the under-scale corrosion occurs, the corrosion of the heating surface of the boiler can be accelerated, and smoke tube leakage and corrosion perforation can occur when the boiler is operated for 6000-35000 h generally.
The thermal power plant realizes the technical supervision of the scaling condition of the heating surface by a method of cutting a pipe during maintenance and sampling to detect the scaling quantity of the heating surface, the measurement of the scaling quantity of the heating surface can only be carried out during maintenance, and the real-time on-line monitoring on the scaling of the heating surface can not be carried out during operation.
In order to realize online real-time monitoring of scaling conditions of a heating surface, prevent the heating surface from being seriously scaled, improve heat transfer efficiency, reduce coal consumption of a unit, prevent pipe explosion accidents caused by under-scale corrosion, and ensure safe, economic and stable operation of a thermal power unit, a system and a method for online real-time monitoring of scaling of the heating surface of a boiler are urgently needed.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a system and a method for monitoring the scale on the heating surface of a boiler, the scale amount on the heating surface is measured by measuring the wall temperature of a pipe to obtain the heat flow of unit length, the online real-time monitoring of the scale amount on the heating surface is realized, the defect that the scale amount on the heating surface can only be detected by cutting a pipe during maintenance at present is overcome, the chemical water treatment device is optimally adjusted according to the scale amount on the heating surface to change the water quality entering a boiler, the scale rate on the heating surface is reduced, the heat exchange capacity of the heating surface is improved, the overtemperature tube explosion caused by scale corrosion on the heating surface is prevented, and the safe, economical and stable operation of a unit is.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a boiler heating surface fouling monitoring system comprising:
the outer wall temperature measuring device is arranged on the outer wall of the pipe and is connected with the signal processor;
the inner wall temperature measuring device is arranged on the inner wall of the pipe and is connected with the signal processor;
the signal processor calculates the pipe wall scale amount according to the outer wall temperature signal and the inner wall temperature signal and outputs the pipe wall scale amount to the controller;
the controller is also connected with a water quality monitoring device and adjusts the chemical water treatment device according to the pipe wall scale amount and the current water quality information so as to change the water quality.
The invention further improves the following steps:
and the outer wall temperature measuring device and the inner wall temperature measuring device are both arranged on the fire facing side of the pipe.
The outer wall temperature measuring device and the inner wall temperature measuring device are vertically arranged on the outer side of the pipe and used for measuring the temperature of the outer wall and the temperature of the inner wall of the pipe.
The material, the pipe diameter and the wall thickness of the pipe are the same as those of the pipe on the heating surface at the system installation position.
The tubes used 12Cr1MoVG, 15CrMoG, T91, TP347 or Super 304H.
A method for monitoring the scaling of a heating surface of a boiler comprises the following steps:
the outer wall temperature measuring device sends an outer wall temperature signal S1 to the signal processor;
the inner wall temperature measuring device sends an inner wall temperature signal S2 to the signal processor;
the signal processor calculates the heat flow passing through the pipe wall in unit length based on the cylindrical heat conduction principle according to the outer wall temperature signal S1 and the inner wall temperature signal S2; the method comprises the following steps of obtaining the pipe wall scale amount according to the boiler load and the unit length heat flow rate according to an established heat flow rate-scale amount model, and realizing online real-time monitoring on the pipe wall scale amount, wherein the unit length heat flow rate q is as follows:
in the above formula, TOuter coverIndicating the temperature of the outer wall, TInner partRepresents the inner wall temperature, rOuter coverRepresents the distance, r, from the temperature measurement point of the outer wall to the centerInner partThe distance from the inner wall temperature measuring point to the center is represented, and lambda represents the heat conductivity coefficient of the pipe;
the controller adjusts the chemical water treatment device according to the pipe wall scale signal D1, changes the water quality entering the furnace, monitors the water quality entering the furnace through the water quality monitoring device, and realizes closed-loop control.
The method is further improved in that:
the pipe wall scaling rate is obtained by monitoring the pipe wall scaling amount on line, and the chemical water treatment device is adjusted when the scaling rate reaches a preset speed, so that the quality of water entering the furnace is changed; and predicting the amount of pipe wall scale in a future period of time, and starting chemical cleaning when the amount of pipe wall scale exceeds the standard requirement.
Compared with the prior art, the invention has the following beneficial effects:
(1) the method measures the heated surface scale amount by measuring the wall temperature to obtain the heat flow of unit length, realizes the online real-time monitoring of the heated surface scale amount, overcomes the defect that the heated surface scale amount can only be detected by cutting a pipe during maintenance and sampling at present, and provides guidance for monitoring the scaling condition of the heated surface by operating personnel.
(2) According to the method, a heat flow-scale amount model under different loads is established through tests, the scale amount of the pipe wall is monitored on line for a long time, the scaling rate of the pipe wall is obtained, the scale amount of the pipe wall in a future period is predicted, and when the scale amount of the pipe wall exceeds the standard requirement, chemical cleaning is carried out, so that the heating surface is prevented from being seriously scaled.
(3) The invention has the automatic control function, adjusts the chemical water treatment device according to the scaling rate of the heating surface, changes the water quality entering the furnace, monitors the water quality entering the furnace through the water quality monitoring device and realizes the closed-loop control.
Drawings
In order to more clearly explain the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a system for monitoring fouling on a heating surface of a boiler used in a coal-fired power plant according to an embodiment of the present invention.
Wherein: 1-pipe, 2-outer wall temperature measuring device, 3-inner wall temperature measuring device, 4-signal processor, 5-controller, 6-water quality monitoring device, and 7-chemical water treatment device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually arranged when the product of the present invention is used, the description is merely for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, cannot be understood as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the system for monitoring the scaling on the heating surface of the boiler comprises a pipe 1, an outer wall temperature measuring device 2, an inner wall temperature measuring device 3, a signal processor 4, a controller 5, a water quality monitoring device 6 and a chemical water treatment device 7.
The signal processor 4 receives an outer wall temperature signal S1 measured by the outer wall temperature measuring device 2 and an inner wall temperature signal S2 measured by the inner wall temperature measuring device 3, calculates to obtain the heat flow of unit length passing through the pipe wall, obtains the pipe wall scale according to the boiler load and the heat flow of unit length according to the established heat flow-scale amount model, inputs the pipe wall scale amount signal D1 into the controller 5 to adjust the chemical water treatment device 7, changes the water quality entering the furnace, monitors the water quality entering the furnace through the water quality monitoring device 6 to realize closed-loop control,
the boiler heating surface scale monitoring system is arranged on the fire facing side of the highest heat load area of the heating surface such as a boiler economizer, a water-cooled wall, a superheater, a reheater and the like, and is used for monitoring the scale amount of the heating surface on line.
The material, the pipe diameter and the wall thickness of the pipe 1 are the same as those of a pipe on a heating surface at a system installation position, and materials such as 12Cr1MoVG, 15CrMoG, T91, TP347, Super304H and the like are adopted.
The outer wall temperature measuring device 2 and the inner wall temperature measuring device 3 are vertically arranged outside the pipe 1 and used for measuring the outer wall temperature S1 and the inner wall temperature S2 of the pipe.
The signal processor 4 is used for receiving the outer wall temperature signal S1 and the inner wall temperature signal S2 and calculating the heat flow passing through the pipe wall in unit length according to the cylindrical heat conduction principle; and the pipe wall scale amount is obtained according to the boiler load and the heat flow of unit length according to the established heat flow-scale amount model, so that the on-line real-time monitoring of the pipe wall scale amount is realized.
Heat flow per unit length:
Touter cover-the temperature of the outer wall; t isInner part-temperature of the inner wall; r isOuter cover-outer wall temperature measurement point to center distance; r isInner part-inner wall temperature measurement point to center distance; lambda-the thermal conductivity of the tube.
The controller 5 adjusts the chemical water treatment device 7 according to the pipe wall scale signal D1 to change the water quality entering the furnace, and monitors the water quality entering the furnace through the water quality monitoring device 6 to realize closed-loop control.
The pipe wall scaling rate is obtained by monitoring the pipe wall scaling amount on line for a long time, and when the scaling rate is higher, the chemical water treatment device is adjusted to change the water quality entering the furnace; and predicting the amount of the pipe wall scale in a future period of time, and carrying out chemical cleaning when the amount of the pipe wall scale exceeds the standard requirement.
In the embodiment, the method for measuring the wall temperature to obtain the heat flow of the unit length is used for measuring the heated surface scale amount, so that the online real-time monitoring of the heated surface scale amount is realized, the defect that the heated surface scale amount can only be detected by pipe cutting sampling during maintenance at present is overcome, the chemical water treatment device is optimally adjusted according to the heated surface scale amount to change the water quality entering the furnace, the heating surface scaling rate is reduced, the heating surface heat exchange capacity is improved, the phenomenon that the heated surface is corroded under scale to cause overtemperature tube explosion is prevented, and the safe, economical and stable operation of the unit is guaranteed.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A boiler heating surface fouling monitoring system is characterized by comprising:
the outer wall temperature measuring device (2), the outer wall temperature measuring device (2) is arranged on the outer wall of the pipe (1) and is connected with the signal processor (4);
the inner wall temperature measuring device (3), the inner wall temperature measuring device (3) is arranged on the inner wall of the pipe (1) and is connected with the signal processor (4);
the signal processor (4) is used for calculating the pipe wall scale amount according to the outer wall temperature signal and the inner wall temperature signal, and outputting the pipe wall scale amount to the controller (5);
the water quality monitoring device comprises a controller (5), wherein the controller (5) is also connected with a water quality monitoring device (6), and the controller (5) adjusts a chemical water treatment device (7) according to the scale amount of the pipe wall and the current water quality information so as to change the water quality.
2. The system for monitoring fouling on a heating surface of a boiler as claimed in claim 1, wherein the outer wall temperature measuring device (2) and the inner wall temperature measuring device (3) are both arranged on the fire facing side of the tube.
3. The system for monitoring fouling on a heating surface of a boiler as claimed in claim 1, wherein the outer wall temperature measuring device (2) and the inner wall temperature measuring device (3) are vertically installed outside the tube (1) for measuring the outer wall temperature and the inner wall temperature of the tube.
4. The system for monitoring the fouling on the heating surface of the boiler according to claim 1, wherein the material, the pipe diameter and the wall thickness of the pipe (1) are the same as those of the pipe on the heating surface at the system installation position.
5. The system for monitoring fouling on the heating surface of a boiler according to claim 4, characterized in that the tube (1) is 12Cr1MoVG, 15CrMoG, T91, TP347 or Super 304H.
6. A method for monitoring fouling on a heating surface of a boiler using the system of any one of claims 1 to 5, comprising the steps of:
the outer wall temperature measuring device (2) sends an outer wall temperature signal S1 to the signal processor (4);
the inner wall temperature measuring device (3) sends an inner wall temperature signal S2 to the signal processor (4);
the signal processor (4) calculates the heat flow passing through the pipe wall in unit length based on the cylindrical heat conduction principle according to the outer wall temperature signal S1 and the inner wall temperature signal S2; the method comprises the following steps of obtaining the pipe wall scale amount according to the boiler load and the unit length heat flow rate according to an established heat flow rate-scale amount model, and realizing online real-time monitoring on the pipe wall scale amount, wherein the unit length heat flow rate q is as follows:
in the above formula, TOuter coverIndicating the temperature of the outer wall, TInner partRepresents the inner wall temperature, rOuter coverRepresents the distance, r, from the temperature measurement point of the outer wall to the centerInner partThe distance from the inner wall temperature measuring point to the center is represented, and lambda represents the heat conductivity coefficient of the pipe;
the controller (5) adjusts the chemical water treatment device (7) according to the pipe wall scale signal D1, changes the water quality entering the furnace, monitors the water quality entering the furnace through the water quality monitoring device (6), and realizes closed-loop control.
7. The method for monitoring the scaling on the heating surface of the boiler as claimed in claim 6, wherein the scaling rate of the tube wall is obtained by on-line monitoring of the scaling amount of the tube wall, and the chemical water treatment device is adjusted to change the water quality entering the boiler when the scaling rate reaches a preset speed; and predicting the amount of pipe wall scale in a future period of time, and starting chemical cleaning when the amount of pipe wall scale exceeds the standard requirement.
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| CN202011315172.XA CN112429856A (en) | 2020-11-20 | 2020-11-20 | Boiler heating surface scaling monitoring system and method |
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| CN202011315172.XA CN112429856A (en) | 2020-11-20 | 2020-11-20 | Boiler heating surface scaling monitoring system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118362603A (en) * | 2024-06-17 | 2024-07-19 | 中兰环保科技股份有限公司 | Heating surface thermodynamic state monitoring method and garbage incinerator applying same |
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| CN103111446A (en) * | 2013-03-07 | 2013-05-22 | 天津亿利科能源科技发展股份有限公司 | Method for handling inner scaling problem of offshore production platform pipeline device |
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| CN211926151U (en) * | 2019-12-26 | 2020-11-13 | 广州市博乐锅炉有限公司 | Device for monitoring scale of heated pipe of boiler |
| CN213738810U (en) * | 2020-11-20 | 2021-07-20 | 西安热工研究院有限公司 | Boiler heating surface scale deposit monitoring system |
-
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- 2020-11-20 CN CN202011315172.XA patent/CN112429856A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103111446A (en) * | 2013-03-07 | 2013-05-22 | 天津亿利科能源科技发展股份有限公司 | Method for handling inner scaling problem of offshore production platform pipeline device |
| CN108507521A (en) * | 2017-11-24 | 2018-09-07 | 吉林省电力科学研究院有限公司 | A kind of on-line monitoring method of electric boiler heating element surface scale thickness |
| CN211926151U (en) * | 2019-12-26 | 2020-11-13 | 广州市博乐锅炉有限公司 | Device for monitoring scale of heated pipe of boiler |
| CN213738810U (en) * | 2020-11-20 | 2021-07-20 | 西安热工研究院有限公司 | Boiler heating surface scale deposit monitoring system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118362603A (en) * | 2024-06-17 | 2024-07-19 | 中兰环保科技股份有限公司 | Heating surface thermodynamic state monitoring method and garbage incinerator applying same |
| CN118362603B (en) * | 2024-06-17 | 2024-09-13 | 中兰环保科技股份有限公司 | Heating surface thermodynamic state monitoring method and garbage incinerator applying same |
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