CN108534170A - A kind of boiler smoke wind blending heating regulating system and its control method - Google Patents
A kind of boiler smoke wind blending heating regulating system and its control method Download PDFInfo
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- CN108534170A CN108534170A CN201810292725.0A CN201810292725A CN108534170A CN 108534170 A CN108534170 A CN 108534170A CN 201810292725 A CN201810292725 A CN 201810292725A CN 108534170 A CN108534170 A CN 108534170A
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- 239000000779 smoke Substances 0.000 title claims abstract description 59
- 238000002156 mixing Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 7
- 238000010438 heat treatment Methods 0.000 title claims abstract description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000003546 flue gas Substances 0.000 claims abstract description 25
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 18
- 239000003245 coal Substances 0.000 claims description 27
- 239000000428 dust Substances 0.000 claims description 25
- 238000002485 combustion reaction Methods 0.000 claims description 14
- 238000005259 measurement Methods 0.000 claims 2
- 230000000007 visual effect Effects 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 238000006477 desulfuration reaction Methods 0.000 abstract description 4
- 230000023556 desulfurization Effects 0.000 abstract description 4
- 238000001035 drying Methods 0.000 abstract description 3
- 239000002351 wastewater Substances 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 abstract 2
- 238000000227 grinding Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000009792 diffusion process Methods 0.000 description 4
- 239000000443 aerosol Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 150000004763 sulfides Chemical class 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 210000003746 feather Anatomy 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000012716 precipitator Substances 0.000 description 1
- 210000000697 sensory organ Anatomy 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- 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
- F23L15/00—Heating of air supplied for combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
-
- 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
- F23L2900/00—Special arrangements for supplying or treating air or oxidant for combustion; Injecting inert gas, water or steam into the combustion chamber
- F23L2900/15043—Preheating combustion air by heat recovery means located in the chimney, e.g. for home heating devices
-
- 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)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Supply (AREA)
- Chimneys And Flues (AREA)
Abstract
The present invention relates to a kind of boiler smoke wind to blend heating regulating system and its control method, the entrance side or outlet side of its deduster are equipped with the heat exchanger being located in flue, the air inlet of heat exchanger is equipped with wind turbine, the gas outlet of heat exchanger exports the hot-air intake in side flue with desulfurizing tower by pipeline I and is connected to, and air door I is equipped on pipeline I；The gas outlet of heat exchanger is also connected to by pipeline II with the air inlet of pressure fan, and air door II is housed on pipeline II.The present invention is by reducing deduster or desulfurizing tower inlet flue gas temperature; be conducive to protect deduster; and the loss of desulfurization water and the discharge capacity of waste water are reduced, hot-air is sent into primary air fan, can increase substantially drying capacity of pulverizer; hot-air blending enters chimney; white plume visual pollution is can effectively eliminate, by installing temperature point and controller, realizes the closed-loop control of temperature; it can effectively achieve the desired results, the optimum balance state that the economy of device and the feature of environmental protection are adjusted.
Description
Technical Field
The invention relates to the technical field of flue gas treatment of coal-fired boilers, in particular to a boiler flue gas and air mixing temperature rise regulating system and a control method thereof.
Background
The pulverized coal for pulverized coal furnace combustion is made by grinding massive raw coal by a coal mill, in order to improve the combustion effect and the grinding efficiency, cold air is required to be heated by an air preheater arranged inside a boiler, and then becomes hot air, the hot air is blown into the coal mill to improve the drying grinding output and play a role of helping grinding, the hot air carries the pulverized coal to enter a hearth for combustion, the high-temperature hot air has the function of supporting combustion, the outlet temperature of the coal mill needs to be controlled within a certain temperature range, the balance of safety and economy is achieved, in the actual production, because the raw coal contains excessive internal moisture or external moisture, the temperature of the hot air is often insufficient, and the conditions of grinding output and combustion-supporting effect are influenced. The pulverized coal can form a large amount of dust fly ash particles and sulfides when being combusted in the boiler, and the coal-fired power plant generally adopts a dust remover to filter dust particles and a limestone wet desulfurization method to desulfurize sulfides in flue gas for realizing ultralow emission. The temperature of the smoke at the outlet of the air preheater is usually 120-150 ℃, the smoke enters the desulfurizing tower after passing through the dust remover, the temperature of the smoke discharged from the desulfurizing tower is usually 45-50 ℃, and a large amount of spray water of the desulfurizing tower can be evaporated and carried away, so that the waste of water resources is caused, and the excessive discharge of the desulfurization waste water is caused. Meanwhile, high-humidity flue gas discharged by the desulfurizing tower is sent into a chimney to be discharged into the atmosphere, and the flue gas with high humidity often generates a gypsum feather phenomenon of emitting white smoke at the outlet of the chimney to cause negative visual pollution, and a large amount of aerosol fog drops can be formed at the outlet of the chimney to fall to a nearby area, so that intuitive pollution to sense organs and factors for forming haze are further caused for people. One of the means for solving the problem of white smoke emission of the chimney in the prior art is to install a hot water circulation heat exchanger at the inlet of the chimney, because low-temperature and high-humidity furnace smoke contains sulfur oxide, acid dew is easy to form at low temperature, and the furnace smoke is extremely corrosive. The bag-type dust collector is a dust collecting device with ultralow emission all the time, the too high or too low smoke temperature can affect the dust collecting effect and the use safety of a bag, the smoke temperature needs to be maintained in a certain range so as to ensure the use safety and the dust collecting effect of the bag-type dust collector, and in the production practice, the problem that the outlet temperature of an air preheater is too high and is difficult to adjust and control exists. The changes of working conditions such as boiler load, external conditions and coal-fired internal and external moisture are always in a large-scale fluctuation state, the temperature of smoke entering the outlet of the air preheater can be changed violently, which brings troubles to temperature regulation and control, so that a set of boiler smoke temperature regulation and control method and a regulation and control system applying the method need to be researched, the synchronous regulation of the smoke temperature at the inlet of the bag-type dust collector and the inlet of the chimney is realized, the smoke temperature can be dynamically regulated under different working conditions, and the smoke temperature of the smoke at different positions can be controlled in respective target ranges.
Disclosure of Invention
The invention provides a boiler smoke and air mixing temperature-rise adjusting system and a control method thereof in order to make up for the defects of the prior art.
The invention is realized by the following technical scheme:
a boiler flue gas and air mixing and heating regulation system is characterized in that a smoke outlet of a combustion chamber is connected with a flue, a dust remover and a desulfurizing tower are sequentially arranged at a flue smoke inlet, and the tail end of the flue is connected with a chimney; an air inlet of a coal mill is connected with a primary fan (or a blower) through a pipeline III, an air preheater positioned on a flue is arranged on the pipeline III, and an outlet of the coal mill is communicated to a combustion chamber; the special points are that: the inlet side or the outlet side of the dust remover is provided with a heat exchanger positioned in the flue, the air inlet of the heat exchanger is provided with a fan, the air outlet of the heat exchanger is communicated with a hot air inlet on the flue at the outlet side of the desulfurizing tower through a pipeline I, and the pipeline I is provided with an air door I; the air outlet of the heat exchanger is also communicated with the air inlet of the air feeder through a pipeline II, and an air door II is arranged on the pipeline II.
As preferred scheme, above-mentioned fan is the frequency conversion fan, and throttle I, throttle II adjust the aperture through the executor.
The technical scheme of the invention also comprises a controller and the following measuring points:
an external air temperature measuring point and an atmospheric pressure measuring point;
a temperature measuring point I is positioned at the tail end of the flue;
a temperature measuring point II is positioned in the outlet flue of the heat exchanger;
a temperature measuring point III is positioned on the heat exchanger outlet pipeline I;
a temperature measuring point IV is positioned on an outlet pipeline of the coal mill;
the measuring units of the temperature measuring points and the atmospheric pressure measuring points are connected to a controller, and the controller is further connected with a speed regulator of the fan, an actuator I of the air door I and an actuator II of the air door II in a control line mode so as to control the wind power of the fan and the opening degrees of the air door I and the air door II.
In the technical scheme, the heat exchanger absorbs the heat of hot flue gas in a flue to heat air blown by a variable frequency fan, the heated hot air is divided into two paths, one path of the heated hot air is blown into an air suction inlet of a primary fan (a blower), the heated hot air is pressurized by the primary fan and then is fed into an air preheater to be heated, and the heated hot air is heated into hot air which enters a coal mill to be used for grinding assistance, is mixed with pulverized coal and then is blown into a hearth to participate in combustion; in another way hot-air directly got into the flue of desulfurizing tower export, got into the chimney and discharged into the atmosphere after mixing with the wet cold combustion flue gas of desulfurizing tower export, this temperature and the exhaust velocity that can increase substantially the entering chimney flue gas to dilute moisture by a wide margin reduces the humidity of mixing the cigarette air, is favorable to improving the saturation and the diffusion velocity of chimney exhaust flue gas, before the flue gas has not condensed formation aerosol, with its diffusion, and then eliminate its white smoke visual pollution and reduce the haze and form.
The control method of the boiler smoke and air mixing temperature-rise adjusting system comprises the following steps:
the controller adjusts the rotating speed of the variable frequency fan according to the temperature feedback values of the temperature measuring point II and the temperature measuring point III, when the measured value at the temperature measuring point II is higher than the target control range value at the temperature measuring point II or the measured value at the temperature measuring point III is lower than the target control range value at the temperature measuring point III, the variable frequency fan is controlled to increase the rotating speed, and when the measured value at the temperature measuring point II is lower than the target control range value at the temperature measuring point or the measured value at the temperature measuring point III is higher than the target control range value at the temperature measuring point II, the variable frequency fan is controlled to reduce the rotating speed, so that the air quantity entering the heat exchanger is adjusted, and the smoke temperature at the outlet of the heat exchanger and the;
the controller adjusts the opening degree of the air door II by adjusting the actuator II according to the temperature feedback value of the temperature measuring point IV, when the measured value of the temperature measuring point IV is lower than the target control range value of the temperature measuring point IV, the controller controls the actuator II to improve the opening degree of the air door II, and when the measured value of the temperature measuring point IV is higher than the target control range value of the temperature measuring point IV, the controller controls the actuator II to reduce the opening degree of the air door II, so that the outlet temperature of the coal pulverizer is controlled within a preset range;
the controller adjusts the opening degree of the air door I by adjusting the actuator I according to the temperature feedback value of the temperature measuring point I, when the measured value of the temperature measuring point I is lower than the target control range value of the temperature measuring point I, the controller controls the actuator I to improve the opening degree of the air door I, and when the measured value of the temperature measuring point I is higher than the target control range value of the temperature measuring point I, the controller controls the actuator I to reduce the opening degree of the air door I, so that the flue gas temperature of the mixing zone is controlled within a preset range.
The smoke at the outlet of the chimney forms white smoke plume which is related to the atmospheric pressure and the air temperature, the temperature of the corresponding mixed smoke for eliminating the white smoke plume is also related to the atmospheric pressure and the air temperature, the temperature of the mixed smoke is higher than the temperature required for eliminating the smoke plume, energy waste can be caused, the temperature of the mixed smoke is lower than the temperature required for eliminating the smoke plume, and the effect of eliminating the smoke plume is not good. In order to achieve the best balance of smoke plume elimination and energy conservation, the target control value Ts of the mixed smoke temperature at the tail end of the flue is corrected according to an atmospheric temperature real-time value Td measured by an air temperature measuring point and an air pressure real-time value Pd measured by an atmospheric pressure measuring point, and the target control value formula of the Ts is as follows:(ii) a Wherein,: standard value of temperature: (70℃）；: a temperature correction value for the temperature of the object,；: lagrange coefficients;: a bias coefficient;sigma belongs to R and sigma is more than 0, the nuclear parameters need to be manually set; : an atmospheric temperature real-time value;: an air pressure real-time value;、: the large data sample value.
The invention has the beneficial effects that: the heat exchanger is additionally arranged at the inlet or the outlet of the dust remover, the heated air is respectively sent into the inlet of a primary fan (air feeder) and the inlet of a chimney, the temperature is controlled by an additionally arranged temperature sensor and a controller, the dust remover or the inlet smoke temperature of a desulfurizing tower is reduced, the dust remover is protected, the loss of desulfurization water and the discharge amount of wastewater are reduced, the hot air is sent into the primary fan, the drying output of a coal mill can be greatly improved, the hot air is mixed and enters the chimney, the visual pollution of white smoke plume can be effectively eliminated, the closed-loop control of the temperature is realized by installing a temperature measuring point and the controller, the expected effect can be effectively achieved, and the optimal balance state of the economy and the environmental protection of the device is adjusted.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic structural view of example 1;
FIG. 2 is a schematic structural view of example 2;
in the figure, 1 flue, 2 chimney, 3 dust remover, 4 desulfurizing tower, 5 heat exchanger, 6 hot air inlet, 7 pipeline I, 8 air door I, 9 actuator I, 11 pipeline II, 12 air door II, 13 actuator II, 14 primary fan (blower), 15 pipeline III, 16 air preheater, 17 coal pulverizer, 18 fan, 19 controller, 20 air temperature measuring point, 21 atmospheric pressure measuring point, 22 temperature measuring point I, 23 temperature measuring point II, 24 temperature measuring point III, 25 temperature measuring point IV.
Detailed Description
The present invention will be described in detail with reference to specific examples.
Example 1
The boiler flue gas and air mixing and heating regulation system in the embodiment is shown in the attached figure 1, wherein a smoke outlet of a combustion chamber (not shown in the figure) is connected with a flue 1, a dust remover 3 and a desulfurizing tower 4 are sequentially arranged at a flue smoke inlet, and the tail end of the flue is connected with a chimney 2; an air inlet of a coal mill 17 is connected with a primary fan (blower) 14 through a pipeline III 15, an air preheater 16 positioned on a flue is arranged on the pipeline III, and an outlet of the coal mill is communicated to a combustion chamber; the outlet side of the dust remover is provided with a heat exchanger 5 positioned in the flue, the air inlet of the heat exchanger is provided with a fan 18, the air outlet of the heat exchanger is communicated with a hot air inlet 6 on the flue at the outlet side of the desulfurizing tower through a pipeline I7, and the pipeline I is provided with an air door I8; the air outlet of the heat exchanger is also communicated with the air inlet of the air feeder through a pipeline II 11, and an air door II 12 is arranged on the pipeline II.
This embodiment also includes the following stations:
an external air temperature measuring point 20, an atmospheric pressure measuring point 21;
a temperature measuring point I22 positioned at the tail end of the flue (a flue inlet of a chimney);
a temperature measuring point II 23 is positioned in the flue at the outlet of the heat exchanger;
a temperature measuring point III 24 is positioned on a hot air channel (namely a pipeline I) at the outlet of the heat exchanger;
and a temperature measuring point IV 25 is positioned on the outlet pipeline of the coal mill.
The measuring units (sensors) of the temperature measuring points and the atmospheric pressure measuring points are connected to a controller 19, and the controller is further in control line connection with a speed regulator of the fan 18, an actuator I9 of the air door I and an actuator II 13 of the air door II so as to control the wind power of the fan and the opening degrees of the air door I and the air door II.
In the embodiment, a heat exchanger 5 arranged in an outlet flue of a dust remover absorbs heat of hot flue gas in the flue to heat air blown by a variable frequency fan 18, the heated hot air is divided into two paths, one path of the heated hot air is blown into an air suction inlet of a primary fan (blower) 14, the heated hot air is pressurized by the primary fan and then is fed into an air preheater 16 to be heated, and the heated hot air is heated to form hot air which enters a coal mill for grinding assistance, is mixed with pulverized coal and then is blown into a hearth to participate in combustion; in another way hot-air directly got into the flue of desulfurizing tower export, got into the chimney and discharged into the atmosphere after mixing with the wet cold combustion flue gas of desulfurizing tower export, this temperature and the exhaust velocity that can increase substantially the entering chimney flue gas to dilute moisture by a wide margin reduces the relative humidity of mixing the cigarette air, is favorable to improving the saturation and the diffusion velocity of chimney exhaust flue gas, before the flue gas has not condensed formation aerosol, with its diffusion, and then eliminate its white smoke visual pollution and reduce the haze and form.
The control method in this embodiment is as follows:
the controller 19 automatically adjusts the rotating speed of the variable frequency fan 18 and adjusts the air quantity entering the heat exchanger according to the temperature feedback values of the temperature measuring point II 23 and the temperature measuring point III 24, so that the temperature of the smoke and the hot air at the outlet of the heat exchanger is always controlled within a preset range under the working condition that the temperature of the smoke and the temperature of the air at the outlet of the preheater frequently change.
The controller automatically adjusts the opening degree of the air door II 12 through adjusting the actuator II 13 according to the temperature feedback value of the temperature measuring point IV 25, and the outlet temperature of the coal mill is automatically controlled within a preset range.
The controller automatically adjusts the opening degree of the air door I8 through adjusting the actuator I9 according to the temperature feedback value of the temperature measuring point I22, and the flue gas temperature of the mixing area is automatically controlled within a preset range.
The smoke at the outlet of the chimney forms white smoke plume which is related to the atmospheric pressure and the air temperature, the temperature of the corresponding mixed smoke for eliminating the white smoke plume is also related to the atmospheric pressure and the air temperature, the temperature of the mixed smoke is higher than the temperature required for eliminating the smoke plume, energy waste can be caused, the temperature of the mixed smoke is lower than the temperature required for eliminating the smoke plume, and the effect of eliminating the smoke plume is not good. In order to achieve the optimal balance of smoke plume elimination and energy conservation, a control target value Ts of the mixed smoke temperature is corrected according to the atmospheric temperature Td measured by the air temperature measuring point 20 and the real-time value Pd of the air pressure measured by the atmospheric pressure measuring point 21, and a target control value formula of the Ts is as follows:(ii) a Wherein,: setting a temperature value;: standard value of temperature: (70℃）；: a temperature correction value;；: lagrange coefficients;: a bias coefficient;sigma belongs to R and sigma is more than 0, the nuclear parameters need to be manually set; : an atmospheric temperature real-time value;: an air pressure real-time value;、: the large data sample value.
Example 2
This embodiment differs from embodiment 1 in that the heat exchanger 5 is installed in the flue on the inlet side of the precipitator. As shown in fig. 2, the embodiment can reduce the temperature of the flue gas entering the dust remover by installing the heat exchanger in the flue at the inlet side of the dust remover, so as to avoid damaging the dust removing cloth bag of the dust remover due to overhigh temperature of the flue gas.
The present invention has been described above by way of example, but the present invention is not limited to the above-described specific embodiments, and any modification or variation made based on the present invention is within the scope of the present invention as claimed.
Claims (5)
1. A boiler flue gas and air mixing and heating regulation system is characterized in that a smoke outlet of a combustion chamber is connected with a flue (1), a dust remover (3) and a desulfurizing tower (4) are sequentially arranged at a flue smoke inlet, and the tail end of the flue is connected with a chimney (2); an air inlet of a coal mill (17) is connected with a blower (14) through a pipeline III (15), an air preheater (16) positioned on a flue is arranged on the pipeline III, and an outlet of the coal mill is communicated to a combustion chamber; is characterized in that: a heat exchanger (5) positioned in the flue is arranged on the inlet side or the outlet side of the dust remover, a fan (18) is arranged at the air inlet of the heat exchanger, the air outlet of the heat exchanger is communicated with a hot air inlet (6) on the flue on the outlet side of the desulfurizing tower through a pipeline I (7), and an air door I (8) is arranged on the pipeline I; the air outlet of the heat exchanger is communicated with the air inlet of the air feeder through a pipeline II (11), and an air door II (12) is arranged on the pipeline II.
2. The boiler smoke and air mixing temperature-rising regulating system according to claim 1, characterized in that: the fan (18) is a variable frequency fan, and the air door I and the air door II are provided with actuators for adjusting the opening degree.
3. The boiler flue gas and air blending temperature-rising regulating system according to claim 2, characterized in that: the device also comprises a controller (19) and the following measuring points:
an external air temperature measuring point (20) and an atmospheric pressure measuring point (21);
a temperature measuring point I (22) positioned at the tail end of the flue;
a temperature measuring point II (23) positioned in the flue at the outlet of the heat exchanger;
a temperature measuring point III (24) is positioned on the heat exchanger outlet pipeline I;
a temperature measuring point IV (25) positioned on an outlet pipeline of the coal mill;
the measuring units of the temperature measuring points and the atmospheric pressure measuring points are connected to a controller, and the controller is further connected with a speed regulator of the fan, an actuator I (9) of the air door I and an actuator II (13) of the air door II in a control line mode to control the wind power of the fan and the opening degrees of the air door I and the air door II.
4. The control method of the boiler smoke and air mixing temperature-rising regulating system according to claim 3 is characterized in that: the controller (19) adjusts the rotating speed of the variable frequency fan (18) according to the temperature feedback values of the temperature measuring point II (23) and the temperature measuring point III (24), when the measured value at the temperature measuring point II is higher than the target control range value at the temperature measuring point II or the measured value at the temperature measuring point III is lower than the target control range value at the temperature measuring point II, the variable frequency fan is controlled to increase the rotating speed, and when the measured value at the temperature measuring point II is lower than the target control range value at the temperature measuring point II or the measured value at the temperature measuring point III is higher than the target control range value at the temperature measuring point III, the variable frequency fan is controlled to reduce the rotating speed, so that the air quantity entering the heat exchanger is adjusted, and the temperature of smoke at the outlet of the heat exchanger and the;
the controller adjusts the opening degree of the air door II (12) by adjusting the actuator II (13) according to a temperature feedback value of the temperature measuring point IV (25), when an actual measurement value at the temperature measuring point IV is lower than a target control range value at the temperature measuring point IV, the controller controls the actuator II to improve the opening degree of the air door II (12), and when the actual measurement value at the temperature measuring point IV is higher than the target control range value at the temperature measuring point IV, the controller controls the actuator II to reduce the opening degree of the air door II (12), so that the outlet temperature of the coal mill is controlled within a preset range;
the controller adjusts the opening degree of the air door I (8) by adjusting the actuator I (9) according to the temperature feedback value of the temperature measuring point I (22), when the measured value of the temperature measuring point I is lower than the target control range value of the temperature measuring point I, the controller controls the actuator I to improve the opening degree of the air door I, and when the measured value of the temperature measuring point I is higher than the target control range value of the temperature measuring point I, the controller controls the actuator I to reduce the opening degree of the air door I, so that the flue gas temperature of the mixing zone is controlled within a preset range.
5. The control method according to claim 4, characterized in that: the control target value Ts of the mixed smoke temperature at the tail end of the flue is corrected according to an atmospheric temperature real-time value Td measured by an air temperature measuring point (20) and an air pressure real-time value Pd measured by an atmospheric pressure measuring point (21), and the target control value formula of Ts is as follows:(ii) a Wherein,: standard value of temperature: (70℃）；: a temperature correction value for the temperature of the object,；: lagrange coefficients;: a bias coefficient;σ e R and σ > 0 is that the nuclear parameters need to be set manually; : an atmospheric temperature real-time value;: an air pressure real-time value;、: the large data sample value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810292725.0A CN108534170B (en) | 2018-03-30 | 2018-03-30 | Boiler smoke and wind mixing temperature rise adjusting system and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810292725.0A CN108534170B (en) | 2018-03-30 | 2018-03-30 | Boiler smoke and wind mixing temperature rise adjusting system and control method thereof |
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| Publication Number | Publication Date |
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| CN108534170A true CN108534170A (en) | 2018-09-14 |
| CN108534170B CN108534170B (en) | 2024-07-09 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117073003A (en) * | 2023-08-11 | 2023-11-17 | 华能山东发电有限公司烟台发电厂 | A control device for increasing the primary and secondary air temperatures of boiler combustion |
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