CN114576645A - Active control method for wall temperature overtemperature of high-temperature heating surface of opposed firing coal-fired boiler - Google Patents
Active control method for wall temperature overtemperature of high-temperature heating surface of opposed firing coal-fired boiler Download PDFInfo
- Publication number
- CN114576645A CN114576645A CN202210300229.1A CN202210300229A CN114576645A CN 114576645 A CN114576645 A CN 114576645A CN 202210300229 A CN202210300229 A CN 202210300229A CN 114576645 A CN114576645 A CN 114576645A
- Authority
- CN
- China
- Prior art keywords
- wall temperature
- air door
- temperature
- over
- air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000010304 firing Methods 0.000 title description 4
- 239000003245 coal Substances 0.000 claims abstract description 27
- 238000012360 testing method Methods 0.000 claims abstract description 23
- 230000008859 change Effects 0.000 claims abstract description 16
- 230000009466 transformation Effects 0.000 claims abstract description 14
- 230000009471 action Effects 0.000 claims abstract description 11
- 238000005457 optimization Methods 0.000 claims abstract description 9
- 230000004044 response Effects 0.000 claims abstract description 6
- 230000000694 effects Effects 0.000 claims description 6
- 230000004048 modification Effects 0.000 claims description 5
- 238000012986 modification Methods 0.000 claims description 5
- 230000006870 function Effects 0.000 claims description 3
- 230000000007 visual effect Effects 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 abstract 1
- 230000007246 mechanism Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/04—Regulating air supply or draught by operation of single valves or dampers by temperature sensitive elements
- F23N3/045—Regulating air supply or draught by operation of single valves or dampers by temperature sensitive elements using electrical or electromechanical means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
-
- 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
- F23M5/00—Casings; Linings; Walls
- F23M5/08—Cooling thereof; Tube walls
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2237/00—Controlling
- F23N2237/16—Controlling secondary air
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The invention discloses a method for actively controlling the wall temperature of a high-temperature heating surface of a hedging coal-fired boiler to exceed the temperature, which comprises the following steps: monitoring and visualizing the wall temperature of the high-temperature heating surface of the opposed coal-fired boiler; determining the wall temperature adjusting characteristic of the over-fire air door, acquiring action comparison results of the inner secondary air door and the outer secondary air door, determining the corresponding relation between the over-fire air position and the high-temperature heating surface area, and acquiring action amplitude and response time of adjusting the opening degree of the over-fire air door and the wall temperature; performing a wall temperature distribution characteristic test of the coal mill under the combined working condition; the remote control of the overfire air inner secondary air or outer secondary air is realized; and carrying out intelligent air distribution optimization. The wall temperature of the high-temperature heating surface is visualized, the combined operation mode of different coal mills is self-adapted through remote control and transformation of the over-fire air door, the over-fire air door coordination control in high and low wall temperature areas is realized, the working condition change of the unit is intelligently tracked, the over-temperature active control of the wall temperature of the high-temperature heating surface is realized, and the efficiency advantage of the high-capacity high-parameter unit is conveniently exerted.
Description
Technical Field
The invention belongs to the technical field of boilers, and particularly relates to an active control method for wall temperature overtemperature of a high-temperature heating surface of a hedging coal-fired boiler.
Background
The overtemperature of the pipe wall of the high-temperature heating surface of the large-capacity high-parameter unit boiler is an outstanding and common problem faced by the current opposed firing pulverized coal boiler (hereinafter referred to as opposed firing coal boiler), and particularly in recent years, the high-temperature high-parameter unit boiler is limited by ultralow NOx emission, the whole boiler operates in low oxygen, the flame center obviously moves upwards, the overtemperature problem of the pipe wall of the high-temperature heating surface is further aggravated, and the safe and economic operation of the unit is seriously influenced.
The previous combustion adjustment test results fully show that the pipe wall temperature distribution of the high-temperature heating surface (a screen superheater, a high-temperature superheater and a high-temperature reheater) of the opposed coal-fired boiler is closely related to the opening degree of an over-fire air local air door, and the pipe wall temperature of a corresponding area can be effectively controlled through the targeted adjustment of the over-fire air door. However, the over-fire air door is generally adjusted on site and is usually fixed at a certain position, so that the over-fire air door cannot adapt to the working condition changes such as unit load, coal quality in a furnace, coal mill combination and the like. Especially, the air flow structure inside the hearth of the hedging coal-fired boiler naturally determines that the wall temperature distribution of the high-temperature heating surface has huge difference under different coal mill combination working conditions, the traditional manual local adjustment mode of the over-fire air door seeks for compromise balance in consideration of different working conditions, the full-time optimal state cannot be realized, and the exertion of the efficiency advantage of a large-capacity high-parameter unit is greatly limited.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention aims to provide an active control method for the wall temperature overtemperature of a high-temperature heating surface of a hedging coal-fired boiler.
In order to achieve the purpose and achieve the technical effect, the invention adopts the technical scheme that:
a method for actively controlling the wall temperature of a high-temperature heating surface of a hedging coal-fired boiler to exceed the temperature comprises the following steps:
1) visual modification of wall temperature distribution of high-temperature heating surface
The wall temperatures of the high-temperature heating surfaces at different positions of the opposed coal-fired boiler are monitored on line and visually modified to obtain distribution curves of the wall temperatures of the high-temperature heating surfaces at different positions of the opposed coal-fired boiler, so that the positions of the high wall temperatures and corresponding numerical values are obtained;
2) determining wall temperature regulation characteristics of over-fired air damper
Testing the wall temperature regulation characteristics of the secondary air door in the overfire air and the secondary air door outside the overfire air one by one, recording the wall temperature change rule of the high-temperature heating surface in the corresponding region by adjusting the opening of the secondary air door inside the overfire air and the opening of the secondary air door outside the overfire air, acquiring the action comparison result of the secondary air door inside the overfire air and the secondary air door outside the overfire air, obtaining the relation between the opening of the secondary air door inside the overfire air and the opening of the secondary air door outside the overfire air and the wall temperature change of the high-temperature heating surface respectively, determining the corresponding relation between the position of the overfire air and the high-temperature heating surface region, and acquiring the action amplitude and response time of the adjustment of the opening of the overfire air door and the wall temperature;
3) performing a wall temperature distribution characteristic test of the coal mill combination working condition, and adjusting the opening degree of the over-fire air door to ensure that the wall temperature distribution is as uniform as possible and the wall temperature peak value is as low as possible, thereby finally obtaining the optimal opening degree of the over-fire air door corresponding to different coal mill combinations;
4) programmed modification of over-fire air door
Based on the effect comparison result of the overfire air inner secondary air door and the overfire air outer secondary air door, selecting the air door with large wall temperature adjusting effect in the overfire air inner secondary air door and the overfire air outer secondary air door for air door program control transformation, and realizing remote control on-off of the overfire air inner secondary air or the overfire air outer secondary air by adopting an electric or pneumatic driving mode;
5) intelligent air distribution optimization of over-fire air door
And (4) carrying out intelligent air distribution optimization on the air door subjected to air door transformation in the step 4), adjusting the opening degree of the over-fire air door corresponding to a high wall temperature region according to the combination change of the coal mill and the actual wall temperature distribution condition, and assisting with small adjustment of the opening degree of the over-fire air door in a low wall temperature region, so that intelligent and flexible air distribution of the over-fire air is realized, the change of the working condition of the unit is automatically adapted, and the full-time optimal state of the temperature distribution of the pipe wall of the high-temperature heating surface is realized.
Further, in the step 2), when the opening degree of the secondary air door in the overfire air is reduced by a small degree and the wall temperature of the high-temperature heating surface at different positions of the opposed coal-fired boiler is increased by a large degree, the opening degree of the secondary air door in the overfire air is adjusted to the maximum value, and the wall temperature distribution of the high-temperature heating surface is adjusted by adjusting the opening degree of the secondary air door outside the overfire air.
Further, in the step 2), when the opening degree of the secondary air door outside the overfire air is reduced by a small margin and the wall temperature of the high-temperature heating surface at different positions of the opposed coal-fired boiler is increased by a large margin, the opening degree of the secondary air door outside the overfire air is adjusted to the maximum value, and the wall temperature distribution of the high-temperature heating surface is adjusted by adjusting the opening degree of the secondary air door inside the overfire air.
Further, in the step 3), when the wall temperature distribution characteristic test of the coal mill combination working condition is carried out, the following steps are adopted:
firstly, adjusting the opening degree of an over-fire air door corresponding to a high wall temperature area to enable the wall temperature distribution to be as uniform as possible and the wall temperature peak value to be as low as possible, when the temperature peak value of the high wall temperature area is lower than a set value, finishing the test, otherwise, carrying out the next step: and adjusting the opening degree of the over-fire air door corresponding to the high wall temperature area to the maximum, then adjusting the opening degree of the over-fire air door corresponding to the low wall temperature area until the temperature peak value of the high wall temperature area is lower than a set value, and finishing the test when the opening degree of the over-fire air door corresponding to the low wall temperature area is lower than the set value.
Further, in step 5), if intelligent air distribution optimization is performed on the overfire air outer secondary air damper, according to the corresponding relationship between the overfire air inner and outer secondary air dampers and the wall temperature of the high-temperature heating surface, when the wall temperature peak value is higher than a set alarm threshold value, the opening degree of the overfire air outer secondary air damper in the corresponding area is maximum, and if the wall temperature peak value rises until reaching a set over-temperature threshold value, the opening degree of the overfire air outer secondary air damper corresponding to the low wall temperature area is reduced until being reduced to the minimum limit of 30%, so that intelligent air distribution control of wall temperature distribution is realized.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a method for actively controlling the wall temperature of a high-temperature heating surface of a hedging coal-fired boiler to exceed the temperature, which comprises the following steps: the wall temperatures of the high-temperature heating surfaces at different positions of the opposed coal-fired boiler are monitored on line and visually modified to obtain distribution curves of the wall temperatures of the high-temperature heating surfaces at different positions of the opposed coal-fired boiler, so that the positions of the high wall temperatures and corresponding numerical values are obtained; determining the wall temperature regulation characteristic of the over-fire air door, obtaining the action comparison result of the inner secondary air door and the outer secondary air door, obtaining the relation between the opening of the inner secondary air door and the opening of the outer secondary air door of the over-fire air and the wall temperature change of the high-temperature heating surface respectively, determining the corresponding relation between the over-fire air position and the high-temperature heating surface area, and obtaining the action amplitude and the response time of the opening of the over-fire air door and the wall temperature regulation; performing a wall temperature distribution characteristic test of the coal mill under the combined working condition; selecting the overfire air inner secondary air door or the outer secondary air door for air door program control transformation based on the effect comparison result of the overfire air inner secondary air door and the outer secondary air door, so as to realize remote control of the overfire air inner secondary air or the outer secondary air; and carrying out intelligent air distribution optimization on the air door subjected to air door transformation, and realizing the full-time optimal state of the temperature distribution of the pipe wall of the high-temperature heating surface. The method for actively controlling the wall temperature of the high-temperature heating surface of the opposed coal-fired boiler disclosed by the invention automatically adapts to different coal mill combined operation modes by remote control, transformation and optimization of the over-fire air door, and realizes coordinated control of the over-fire air door in high and low wall temperature regions by combining active identification of the wall temperature distribution of the high-temperature heating surface, intelligently tracks the working condition change of a unit, realizes active control of the wall temperature of the high-temperature heating surface, and is convenient for the exertion of the efficiency advantage of a large-capacity high-parameter unit.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a flow chart of adjusting the opening of the overfire air damper corresponding to the coal pulverizer combination of the present invention;
fig. 3 is a schematic view of embodiment 1 of the present invention.
Detailed Description
The present invention is described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and thus the scope of the present invention can be clearly and clearly defined.
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
As shown in fig. 1-3, a method for actively controlling the wall temperature of a high-temperature heating surface of a hedging coal-fired boiler to exceed the temperature comprises the following steps:
1) visual transformation of wall temperature distribution of a high-temperature heating surface:
the wall temperature distribution curve is displayed on a control dial of the controller in real time, the controller can automatically identify the position and the numerical value of the high wall temperature, and operating personnel can flexibly adjust corresponding over-fire air doors aiming at the high point area of the wall temperature in the thermal state operation process;
2) wall temperature adjusting characteristic test of the over-fire air door:
testing the wall temperature regulation characteristics of the air doors of the inner secondary air and the outer secondary air of the over-fire air one by one, recording the wall temperature change rule of the high-temperature heating surface in corresponding areas by adjusting the opening degrees of the air doors of the inner secondary air and the outer secondary air of the over-fire air, and comparing the action of the air doors of the inner secondary air and the outer secondary air to obtain the relationship between the opening degrees of the air doors of the inner secondary air and the outer secondary air of the over-fire air and the wall temperature change of the high-temperature heating surface respectively, thereby providing a suggestion for subsequent program control transformation; the corresponding relation between the position of the over-fire air and the high-temperature heating surface area is determined, and a basis is provided for subsequent intelligent air distribution; acquiring action amplitude and response time of the opening of the over-fire air door and wall temperature adjustment, and laying a foundation for subsequent intelligent air distribution;
3) performing a wall temperature distribution characteristic test of the coal mill under combined working conditions:
the wall temperature distribution characteristic of the working condition of the coal mill combination is obtained through tests, the wall temperature distribution is enabled to be as uniform as possible and the wall temperature peak value is enabled to be as low as possible through adjusting the over fire air door, and finally the optimal opening degree of the over fire air door corresponding to different coal mill combinations is obtained;
4) the programmed transformation of an over-fire air door comprises the following steps:
selecting the secondary air in the overfire air or the external secondary air to carry out air door program control transformation based on the comparison result of the air door functions of the internal secondary air and the external secondary air of the overfire air, optimally designing a program control execution mechanism aiming at the specific structure of the overfire air door, and carrying out configuration on a dial DCS (distributed control System), thereby realizing the remote control of the overfire air door;
5) the intelligent air distribution of the over-fire air door is reformed:
an intelligent air distribution strategy of the over-fire air door is built, the over-fire air door of different coal mill combinations is automatically adapted according to the correlation between the over-fire air door and the wall temperature of the high-temperature heating surface, the over-fire air door corresponding to a high wall temperature area is automatically adjusted according to the actual wall temperature distribution condition, and the small adjustment of a low wall temperature area is assisted, so that the intelligent flexible air distribution of the over-fire air is realized, the working condition change of a unit is automatically adapted, and the full-time optimal state of the temperature distribution of the wall of the high-temperature heating surface is realized.
Example 1
As shown in fig. 1-3, a method for actively controlling the wall temperature of a high-temperature heating surface of a hedging coal-fired boiler, taking a 1000MW supercritical unit hedging coal-fired boiler as an example, specifically comprises the following steps:
1) and visually reconstructing the wall temperature distribution of the high-temperature reheater. In the high-temperature heating surface, the wall temperature overtemperature phenomenon rarely occurs in the screen superheater and the high-temperature superheater, and the wall temperature peak value of the high-temperature reheater is higher, so that the high-temperature reheater always runs on a yellow line and is difficult to control. Therefore, the embodiment monitors and visually transforms the wall temperature distribution of the high-temperature reheater, the wall temperature along the width direction of the hearth is monitored on line by uniformly arranging a plurality of temperature sensors along the width direction of the hearth, the wall temperature data along the width direction of the hearth is transmitted to the processor to be processed, and then a wall temperature distribution curve along the width direction of the hearth is obtained, the distribution curve of the wall temperature along the width direction of the hearth is displayed on the control dial plate of the processor in real time, the controller can automatically identify the position of a wall temperature peak value and a corresponding numerical value, and the direct observation of operators is facilitated. In this embodiment, the high-temperature reheater tube panels are arranged in 74 numbers in sequence from left to right.
2) Wall temperature adjusting characteristic test of the over-fire air door:
the method comprises the steps that the wall temperature change rule of a high-temperature reheater in a corresponding area is recorded by adjusting the opening degrees of an inner secondary air door and an outer secondary air door of overfire air, the functions of the inner secondary air door and the outer secondary air door are compared, the relation between the opening degrees of the inner secondary air door and the outer secondary air door of the overfire air and the wall temperature change of a high-temperature heating surface is obtained, and a suggestion is provided for subsequent program-controlled transformation; the corresponding relation between the position of the over-fire air and the high-temperature heating surface area is determined, and a basis is provided for subsequent intelligent air distribution; the action amplitude and the response time of the opening of the over-fire air door and the wall temperature adjustment are obtained, and a foundation is laid for follow-up intelligent air distribution. Through the inside and outside overgrate air door effect contrast discovery of after-fire air, when the overgrate air door was closed in the after-fire air, the high temperature reheater wall temperature level in corresponding region was showing and is promoting, so the secondary air door is almost all in the full open state in all after-fire air, controls furnace width direction high temperature reheater wall temperature distribution through the differentiation adjustment of the outside secondary air door of after-fire air. The corresponding relationship between the overfire air position and the high temperature reheater tube panel position is shown in fig. 3.
3) Testing the wall temperature distribution characteristic of the coal mill under the combined working condition:
when the coal mill combination operating mode changes, the high temperature reheater wall temperature distribution changes significantly, obtains the outer overgrate air door aperture of the best overfire air that different coal mill combinations correspond through the experiment, sees the outer overgrate air pull rod position table of overfire air that table 1 shows:
TABLE 1
Note: the maximum value of the opening degree of the secondary air door outside the over-fire air is 300mm, and the larger the value is, the larger the air quantity is;
in step 3), when a coal mill combined working condition wall temperature distribution characteristic test is carried out, firstly, the opening degree of an over-fire air door is adjusted to enable the wall temperature distribution to be as uniform as possible and the wall temperature peak value to be as low as possible, when the temperature peak value of a high wall temperature area is lower than a set value, the test is finished, otherwise, the next step is carried out: adjusting the opening degree of an over-fire air door corresponding to the high wall temperature area to enable the wall temperature distribution to be uniform as much as possible and the wall temperature peak value to be low as much as possible, when the temperature peak value of the high wall temperature area is lower than a set value, ending the test, otherwise, carrying out the next step: adjusting the opening degree of the over fire air door corresponding to the high wall temperature area to the maximum, then adjusting the opening degree of the over fire air door corresponding to the low wall temperature area until the temperature peak value of the high wall temperature area is lower than the set value, and when the opening degree of the over fire air door corresponding to the low wall temperature area is lower than the set value, ending the test, as shown in fig. 2.
4) And (3) performing program control transformation on a secondary air door outside the over-fire air:
aiming at the structure of the secondary air door outside the overfire air, a program control actuating mechanism is optimally designed, and the remote control opening and closing of the secondary air door outside the overfire air are realized by adopting an electric or pneumatic driving mode.
5) The outer secondary air door of the overfire air is intelligently air-distributed and reformed:
an intelligent air distribution strategy of the over fire air door is built, the over fire air door is automatically adjusted under different coal mill combination working conditions, meanwhile, according to the corresponding relation between the wall temperature of the outer secondary air door and the wall temperature of the high-temperature reheater, when the wall temperature peak value is higher than 635 ℃, the outer secondary air door of the over fire air in the corresponding area is automatically opened to 100% at the maximum, if the wall temperature peak value is continuously raised to 640 ℃ (the overtemperature value is 649 ℃), the outer secondary air door of the over fire air in the low wall temperature area of the high-temperature reheater is correspondingly closed to be 30% at the minimum, and intelligent air distribution control of wall temperature distribution of the high-temperature reheater is realized.
The parts or structures of the invention which are not described in detail can be the same as those in the prior art or the existing products, and are not described in detail herein.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (5)
1. A method for actively controlling the wall temperature of a high-temperature heating surface of a hedging coal-fired boiler to exceed the temperature is characterized by comprising the following steps:
1) visual modification of wall temperature distribution of high-temperature heating surface
The wall temperatures of the high-temperature heating surfaces at different positions of the opposed coal-fired boiler are monitored on line and visually modified to obtain distribution curves of the wall temperatures of the high-temperature heating surfaces at different positions of the opposed coal-fired boiler, so that the positions of the high wall temperatures and corresponding numerical values are obtained;
2) determining wall temperature regulation characteristics of over-fired air damper
Testing the wall temperature regulation characteristics of the inner secondary air door and the outer secondary air door of the over-fire air one by one, recording the wall temperature change rule of the high-temperature heating surface in corresponding areas by adjusting the opening degrees of the inner secondary air door and the outer secondary air door of the over-fire air, acquiring the action comparison result of the inner secondary air door and the outer secondary air door of the over-fire air, obtaining the relation between the opening degrees of the inner secondary air door and the outer secondary air door of the over-fire air and the wall temperature change of the high-temperature heating surface respectively, determining the corresponding relation between the position of the over-fire air and the high-temperature heating surface area, and acquiring the action amplitude and response time of the opening degrees of the over-fire air door and the wall temperature regulation;
3) performing a wall temperature distribution characteristic test of the coal mill combination working condition, and adjusting the opening degree of the over-fire air door to ensure that the wall temperature distribution is as uniform as possible and the wall temperature peak value is as low as possible, thereby finally obtaining the optimal opening degree of the over-fire air door corresponding to different coal mill combinations;
4) programmed modification of over-fire air door
Selecting an air door with a large wall temperature adjusting function from the overfire air inner secondary air door and the overfire air outer secondary air door for air door program control transformation based on the effect comparison result of the overfire air inner secondary air door and the overfire air outer secondary air door, so as to realize remote control of the overfire air inner secondary air or the overfire air outer secondary air;
5) intelligent air distribution optimization of over-fire air door
And 4) carrying out intelligent air distribution optimization on the air door subjected to air door transformation in the step 4), adjusting the opening degree of the over-fire air door corresponding to a high wall temperature area according to the combination change of the coal mill and the actual wall temperature distribution condition, and assisting with small adjustment of the opening degree of the over-fire air door in a low wall temperature area, so that intelligent and flexible air distribution of the over-fire air is realized, the working condition change of the unit is self-adapted, and the full-time optimal state of the temperature distribution of the pipe wall of the high-temperature heating surface is realized.
2. The method for actively controlling the wall temperature of the high-temperature heating surface of the offset coal-fired boiler according to claim 1, wherein in the step 2), when the opening degree of the secondary air damper in the overfire air is reduced by a small degree and the wall temperature of the high-temperature heating surface at different positions of the offset coal-fired boiler is increased by a large degree, the opening degree of the secondary air damper in the overfire air is adjusted to the maximum value, and the wall temperature distribution of the high-temperature heating surface is adjusted by adjusting the opening degree of the secondary air damper outside the overfire air.
3. The method for actively controlling the wall temperature of the high-temperature heating surface of the offset coal-fired boiler according to claim 1, wherein in the step 2), when the opening degree of the secondary air damper outside the overfire air is reduced by a small degree and the wall temperature of the high-temperature heating surface at different positions of the offset coal-fired boiler is increased by a large degree, the opening degree of the secondary air damper outside the overfire air is adjusted to the maximum value, and the wall temperature distribution of the high-temperature heating surface is adjusted by adjusting the opening degree of the secondary air damper inside the overfire air.
4. The method for actively controlling the wall temperature of the high-temperature heating surface of the opposed coal-fired boiler according to claim 1, wherein in the step 3), when a wall temperature distribution characteristic test of a coal mill combination working condition is carried out, the method is realized by adopting the following steps:
firstly, adjusting the openness of an over-fire air door corresponding to a high wall temperature area to enable the wall temperature distribution to be as uniform as possible and the wall temperature peak value to be as low as possible, when the temperature peak value of the high wall temperature area is lower than a set value, ending the test, otherwise, carrying out the next step: and adjusting the opening degree of the over-fire air door corresponding to the high wall temperature area to the maximum, then adjusting the opening degree of the over-fire air door corresponding to the low wall temperature area until the temperature peak value of the high wall temperature area is lower than a set value, and finishing the test when the opening degree of the over-fire air door corresponding to the low wall temperature area is lower than the set value.
5. The method for actively controlling the wall temperature of the high-temperature heating surface of the opposed coal-fired boiler according to claim 1, wherein in the step 5), if the secondary air door outside the overfire air is subjected to intelligent air distribution optimization, according to the corresponding relationship between the secondary air door inside the overfire air and the secondary air door outside the overfire air and the wall temperature of the high-temperature heating surface, when the peak value of the wall temperature is higher than a set alarm threshold value, the opening degree of the secondary air door outside the overfire air in the corresponding region is maximum, and if the peak value of the wall temperature rises until the set overtemperature threshold value is reached, the opening degree of the secondary air door outside the overfire air corresponding to the low wall temperature region is reduced until the minimum limit is 30%, so that the intelligent air distribution control of the wall temperature distribution is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210300229.1A CN114576645B (en) | 2022-03-25 | 2022-03-25 | Active control method for wall temperature overtemperature of high-temperature heating surface of opposite-impact coal-fired boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210300229.1A CN114576645B (en) | 2022-03-25 | 2022-03-25 | Active control method for wall temperature overtemperature of high-temperature heating surface of opposite-impact coal-fired boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114576645A true CN114576645A (en) | 2022-06-03 |
| CN114576645B CN114576645B (en) | 2024-06-21 |
Family
ID=81776640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210300229.1A Active CN114576645B (en) | 2022-03-25 | 2022-03-25 | Active control method for wall temperature overtemperature of high-temperature heating surface of opposite-impact coal-fired boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114576645B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09250734A (en) * | 1996-03-14 | 1997-09-22 | Babcock Hitachi Kk | Automatic controller for boiler |
| KR100997250B1 (en) * | 2010-07-13 | 2010-11-29 | (주) 태종 엔이씨 | Incinerator automatic control system and method using measured temperature value and heat calculate in incinerator and 2th burn air auto control damper for incinerator |
| US20130239909A1 (en) * | 2011-04-11 | 2013-09-19 | Huaneng Clean Energy Research Institute | Arrangement structure suitable for inverted pulverized coal boiler with ultra-high steam temperature steam parameters |
| WO2017133316A1 (en) * | 2016-02-02 | 2017-08-10 | 华北电力科学研究院有限责任公司 | Method, device, and automatic control system for determining air intake amount for opposed firing |
| CN110006024A (en) * | 2019-01-21 | 2019-07-12 | 国电科学技术研究院有限公司 | The control planning of boiler furnace outlet zone temperature and air door determines method and device |
| CN113108308A (en) * | 2021-04-09 | 2021-07-13 | 苏州西热节能环保技术有限公司 | Method for adjusting wall temperature of flash combustion boiler after low-load abrasion stop |
-
2022
- 2022-03-25 CN CN202210300229.1A patent/CN114576645B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09250734A (en) * | 1996-03-14 | 1997-09-22 | Babcock Hitachi Kk | Automatic controller for boiler |
| KR100997250B1 (en) * | 2010-07-13 | 2010-11-29 | (주) 태종 엔이씨 | Incinerator automatic control system and method using measured temperature value and heat calculate in incinerator and 2th burn air auto control damper for incinerator |
| US20130239909A1 (en) * | 2011-04-11 | 2013-09-19 | Huaneng Clean Energy Research Institute | Arrangement structure suitable for inverted pulverized coal boiler with ultra-high steam temperature steam parameters |
| WO2017133316A1 (en) * | 2016-02-02 | 2017-08-10 | 华北电力科学研究院有限责任公司 | Method, device, and automatic control system for determining air intake amount for opposed firing |
| CN110006024A (en) * | 2019-01-21 | 2019-07-12 | 国电科学技术研究院有限公司 | The control planning of boiler furnace outlet zone temperature and air door determines method and device |
| CN113108308A (en) * | 2021-04-09 | 2021-07-13 | 苏州西热节能环保技术有限公司 | Method for adjusting wall temperature of flash combustion boiler after low-load abrasion stop |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114576645B (en) | 2024-06-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102364252B (en) | Automatic intelligent double cross limiting range combustion control method for heating furnace | |
| CN107655345B (en) | A kind of intelligent temperature control system and temperature control method for calcining stove | |
| CN112859961B (en) | Heating furnace and control method and control system for temperature of heating furnace | |
| CN111981470A (en) | Opposed-wall/arch combustion boiler combustion system intelligent optimization adjustment system and method | |
| CN106196052A (en) | Intelligent pulse combustion system | |
| CN109751590A (en) | Double reheat boiler and attemperation of steam method | |
| CN114576645B (en) | Active control method for wall temperature overtemperature of high-temperature heating surface of opposite-impact coal-fired boiler | |
| CN103090683B (en) | Method for controlling furnace pressure of pulse furnace | |
| CN109595586B (en) | Combustion optimization method and system for preventing high-temperature corrosion of boiler based on CO online detection | |
| CN109539359A (en) | The phase transformation electric heat-storage heating system and method for divided working status PID+ adaptive feedforward compensation | |
| CN106011353A (en) | Self-optimization method for air-fuel ratio of blast-furnace hot blast stove | |
| CN112797399A (en) | Combustion system and method suitable for preventing high-temperature corrosion of opposed combustion boiler | |
| CN112178616A (en) | Coal-fired unit control method considering heat storage space-time distribution | |
| CN111006238A (en) | Method for automatically adjusting up-down position of flame center of hearth of pulverized coal fired boiler with four tangential corners | |
| CN113983489B (en) | Secondary air distribution method for active corrosion prevention of opposed firing boiler | |
| CN108006665A (en) | A kind of waste incinerator flame situation judging and the method for control burning | |
| CN211645345U (en) | Furnace gas volume-based heating furnace hearth pressure dynamic optimization control system | |
| CN108977206A (en) | A kind of quenching furnace prestores the control pressurer system of room | |
| CN113587141A (en) | Automatic regulation and control system of thermal power generating unit combustor pivot angle | |
| CN109141051B (en) | Optimal design method for furnace pressure control of heat accumulating type industrial heating furnace | |
| CN113883492A (en) | Boiler steam temperature control method and electronic equipment | |
| CN109112288B (en) | Temperature adjusting method of annealing furnace | |
| CN106051784A (en) | Combustion control method and device for incinerator | |
| CN110608429A (en) | Method for accurately designing high-temperature reheater of double reheat boiler in partition mode | |
| CN219051641U (en) | Hot air device of micro-oil system of coal mill |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |