CN111237800A - Smoke circulation downstream ash blocking prevention system and ash blocking prevention method thereof - Google Patents
Smoke circulation downstream ash blocking prevention system and ash blocking prevention method thereof Download PDFInfo
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- CN111237800A CN111237800A CN202010097082.1A CN202010097082A CN111237800A CN 111237800 A CN111237800 A CN 111237800A CN 202010097082 A CN202010097082 A CN 202010097082A CN 111237800 A CN111237800 A CN 111237800A
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- 239000000779 smoke Substances 0.000 title claims abstract description 256
- 230000002265 prevention Effects 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 7
- 230000000903 blocking effect Effects 0.000 title claims description 14
- 239000003546 flue gas Substances 0.000 claims abstract description 206
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 201
- 238000005260 corrosion Methods 0.000 claims abstract description 26
- 230000007797 corrosion Effects 0.000 claims abstract description 26
- 238000005338 heat storage Methods 0.000 claims description 59
- 230000000694 effects Effects 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 5
- 230000002035 prolonged effect Effects 0.000 claims description 5
- 238000010926 purge Methods 0.000 claims description 2
- 206010022000 influenza Diseases 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 abstract description 8
- 239000002956 ash Substances 0.000 description 26
- 230000001939 inductive effect Effects 0.000 description 15
- 238000009826 distribution Methods 0.000 description 8
- 239000000428 dust Substances 0.000 description 8
- 230000001965 increasing effect Effects 0.000 description 8
- 239000007789 gas Substances 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000010408 sweeping Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000411 inducer Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- F23L15/02—Arrangements of regenerators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J11/00—Devices for conducting smoke or fumes, e.g. flues
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J13/00—Fittings for chimneys or flues
-
- 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
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
- F23J15/025—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using filters
-
- 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
- F23L11/00—Arrangements of valves or dampers after the fire
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2217/00—Intercepting solids
- F23J2217/10—Intercepting solids by filters
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Supply (AREA)
Abstract
The invention discloses a flue gas circulation downstream ash blockage prevention system and a blockage prevention method thereof, wherein the flue gas circulation downstream ash blockage prevention system comprises: the anti-blocking air preheater comprises a base assembly and an anti-blocking assembly, wherein the base assembly comprises an air preheater body; the air preheater body comprises a flue gas channel, a secondary air channel adjacent to the flue gas channel and a primary air channel adjacent to the secondary air channel; the anti-blocking component comprises a smoke sub-bin arranged on the side of the smoke sub-bin, a smoke sub-bin arranged on the side of the smoke sub-bin and a smoke flow adjusting device arranged for the smoke sub-bin. The sub-flue gas sub-bins are arranged in the low-temperature corrosion dangerous area in the flue gas channel, so that the original flue gas bin is improved into a 1+1 flue gas bin, the flue gas sub-bins are independent and isolated flue gas channels, meanwhile, the sub-flue gas bins are provided with flue gas flow regulating devices, and the flue gas temperature and the outlet speed of the sub-flue gas bins are controlled through the flue gas flow regulating devices, so that the unbalanced control of the flow of the flue gas bins is realized.
Description
Technical Field
The invention relates to a downstream ash blocking prevention device, in particular to a flue gas circulation downstream ash blocking prevention air preheater, and belongs to the technical field of energy conservation.
Background
At present, flue gas denitration facilities additionally arranged in a coal-fired power plant mainly adopt a Selective Catalytic Reduction (SCR) technology. The technology is realized by injecting in an SCR reactor
To make the most of the smoke gas
Reduced to be pollution-free to environment
And
. However, in this process, two side reactions occur:
+
→
and
+
+
→
adversely affecting the operation of the air preheater downstream of the denitrator.
In flue gas
The sulfuric acid steam is generated by combining with the water vapor, and the higher the concentration is, the higher the acid dew point of the flue gas is, the more can the acid dew point reach 140-
The liquid drops not only aggravate the problem of low-temperature corrosion of the air preheater, but also more easily adsorb fly ash; in addition, produced
The fly ash is liquid in the temperature range of 146-.
The ash blockage of the air preheater caused by the operation of a denitration system seriously threatens the safe operation of a unit, the corrosion and ash blockage of the air preheater of a coal-fired boiler in China are more and more serious, and the corrosion and ash blockage phenomenon is shown to have two remarkable characteristics, wherein the ash blockage problem of the air preheater occurs in more and more units, the ash blockage degree is more and more serious, the smoke side resistance of the designed air preheater is usually about 1000Pa, the actual smoke side resistance is as high as about 3000Pa, and some smoke side resistance is even as high as 4000Pa, so that the accident that the unit is forced to be applied for shutdown or caused by non-shutdown is also more and more frequent, and the safety and the normal production of power generation are seriously influenced.
Disclosure of Invention
The purpose of the invention is as follows: the flue gas circulation downstream ash blockage preventing system is provided to solve the problems in the prior art.
The technical scheme is as follows: a flue gas circulation downstream ash blockage prevention system comprises:
a base assembly including an air preheater body; the air preheater body comprises a flue gas channel, a secondary air channel adjacent to the flue gas channel and a primary air channel adjacent to the secondary air channel;
the anti-blocking component comprises a smoke sub-bin arranged on the side part of the smoke sub-bin, a smoke sub-bin arranged on the side part of the smoke sub-bin and a smoke flow adjusting device arranged for the smoke sub-bin.
In a further embodiment, flue gas flow adjusting device is including installing deflector in the flue gas passageway, with the sub-branch storehouse export flue of sub-branch storehouse intercommunication of flue gas installs in proper order expansion joint, damper and the induced smoke machine on the sub-branch storehouse export flue and with the flue gas outlet pipeline of sub-branch storehouse export flue intercommunication sets up the deflector mainly in order can divide the flue gas direction flue gas sub-storehouse of the more distant department of flue gas passageway entry distance flue gas sub-storehouse, and then increases flue gas velocity of flow and flue gas temperature in the sub-branch storehouse of flue gas, and then accomplishes the washing away of sub-branch storehouse of flue gas to the heat accumulation component.
In a further embodiment, the smoke outlet duct is in communication with the smoke inducer; the smoke guiding machine is adjacent to the position of the air regulating door, a sub-bin smoke temperature measuring instrument and a pressure measuring instrument adjacent to the sub-bin smoke temperature measuring instrument are further installed on the sub-bin outlet flue, the sub-bin smoke temperature measuring instrument and the sub-bin smoke temperature measuring instrument are arranged, and the control of the output of the smoke guiding machine and the opening degree of the regulating valve can be realized by real-time measurement and feedback of the sub-bin smoke outlet temperature.
In a further embodiment, the damper is mounted between the expansion joint and the smoke extractor; the smoke outlet pipeline is communicated with the smoke channel outlet, the expansion joint is designed to ensure the balanced thermal expansion of the sub-bin outlet flue, the service life of the sub-bin outlet flue is prolonged, the output adjustment of the smoke inducing machine can greatly improve the smoke flow passing through the smoke sub-bin, and the smoke temperature at the outlet of the smoke outlet pipeline is controlled, so that the unbalanced control of the smoke flow passing through the sub-bin is realized, and the low-temperature corrosion danger zone is eliminated.
In a further embodiment, the guide plate comprises a guide fixing plate fixedly arranged on the flue gas channel, and a guide movable plate movably connected with the guide fixing plate; the lateral part of the guide movable plate is provided with a steering connecting rod, the guide plate is designed into two parts, the guide movable plate is not adjusted mainly when the temperature and the flow rate of the flue gas in the flue gas sub-bin are enough, and the guide movable plate needs to be adjusted when the temperature and the flow rate of the flue gas in the flue gas sub-bin are not enough, so that the flow rate and the temperature of the flue gas in the flue gas sub-bin are enough.
In a further embodiment, the steering connecting rod includes with direction fly leaf fixed connection's the fixed block that turns to, with turn to the fixed block and rotate the first connecting rod of direction of connecting, with the first railing articulated direction second connecting rod of direction, with direction second connecting rod fixed connection's direction pivot, with direction pivot fixed connection's direction third connecting rod, with direction third connecting rod articulated direction fourth connecting rod of direction third connecting rod, and with direction fourth connecting rod articulated direction fifth connecting rod designs and turns to the connecting rod, mainly in order to drive the rotation of direction fly leaf, and then accomplishes the regulation of the inclination of direction fly leaf.
In a further embodiment, the steering fifth link circumscribes a steering rotation motor.
In a further embodiment, the smoke-inducing machine comprises a filter hood communicated with the sub-bin outlet flue, a smoke-inducing inlet communicated with the filter hood, a smoke-inducing shell communicated with the smoke-inducing inlet, and a smoke-inducing outlet communicated with the smoke-inducing shell; the smoke guide outlet is communicated with the smoke outlet pipeline; a smoke guiding motor is installed on the side of the smoke guiding shell, and a smoke guiding fan blade which rotates coaxially with the smoke guiding motor is installed in the smoke guiding shell; the filter mantle with draw cigarette entry and sub-branch storehouse export flue can dismantle the connection, and the design filter mantle is mainly in order to reduce the wearing and tearing of the subsidiary dust of flue gas to the blade.
A flue gas circulation downstream ash blocking prevention method comprises the following steps:
3, the output adjustment of the smoke guiding machine can greatly improve the smoke flow passing through the smoke sub-bin and control the smoke temperature at the outlet of the sub-smoke channel, thereby realizing the non-balanced control of the smoke sub-bin flow, further changing the smoke temperature and the smoke flow speed passing through the low-temperature corrosion dangerous area and eliminating the effect of the low-temperature corrosion dangerous area; the smoke guiding machine rotates through the smoke guiding motor to drive the smoke guiding fan blades to rotate, smoke in the smoke sub-bins is filtered by the filter hoods and then sucked into the smoke guiding inlet, enters the smoke guiding shell through the smoke guiding inlet and flows to the smoke outlet pipeline through the smoke guiding outlet;
and 5, the expansion joint arranged on the sub-bin outlet flue can ensure the balanced thermal expansion of the sub-bin outlet flue when the guide plate guides the flue gas at the position, far away from the flue gas sub-bin, of the flue gas channel inlet to the flue gas sub-bin, so that the service life of the sub-bin outlet flue is prolonged.
Has the advantages that: the invention discloses a flue gas circulation downstream ash blocking prevention system, wherein a sub-flue gas sub-bin is arranged in a low-temperature corrosion dangerous area in a flue gas channel, the original smoke bin is improved to be a 1+1 smoke bin, so that the sub-bins of the smoke become independent and isolated smoke channels, meanwhile, a flue gas flow regulating device is configured for the sub flue gas cabin, the flue gas temperature and the outlet speed of the outlet of the sub flue gas cabin are controlled by the flue gas flow regulating device, thereby realizing the non-equilibrium control of the flow rate of the flue gas bin to eliminate the ash blockage phenomenon when the heat storage element rotates to the low-temperature corrosion dangerous area, and then eliminate the low temperature and corrode the dangerous area, change the gradient of deflector through turning to the connecting rod, and then carry out the gradient of real-time adjustment deflector according to the flue gas temperature that the sub-warehouse flue gas temperature measuring apparatu detected, and then adjust the flue gas temperature of sub-warehouse exit flue, and then accomplish real-time adjustment.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic plan view of the present invention.
FIG. 3 is a schematic of the raw air preheater flue gas side temperature profile.
FIG. 4 is a schematic view of the steering linkage of the present invention.
Figure 5 is a schematic view of the structure of the cigarette lighter of the present invention.
The reference signs are: the smoke guiding device comprises a smoke channel inlet 1, a guide plate 2, a guide movable plate 201, a guide fixed plate 202, a steering fixed block 203, a guide first connecting rod 204, a guide second connecting rod 205, a guide rotating shaft 206, a guide third connecting rod 207, a guide fourth connecting rod 208, a guide fifth connecting rod 209, a smoke sub-bin 3, a smoke sub-bin 4, a sub-bin outlet flue 5, a sub-bin smoke temperature measuring instrument 6, a pressure measuring instrument 7, an expansion joint 8, an air damper 9, a smoke guiding machine 10, a filter cover, a smoke guiding inlet 1002, a smoke guiding motor 1003, a smoke guiding shell 1004, a smoke guiding outlet 1005, a smoke outlet pipeline 11 and a smoke channel outlet 12.
Detailed Description
Through research and analysis of the applicant, the reason for the problem (accidents that the unit is forced to apply for shutdown or the unit is not stopped are caused to occur frequently, and the safety and normal production of power generation are seriously influenced) is that the air preheater is blocked due to the operation of a denitration system, the safe operation of the unit is seriously threatened, the air preheater of the coal-fired boiler in China is more and more seriously corroded and blocked, and the coal-fired boiler has two remarkable characteristics, namely, the more and more units have the ash blocking problem of the air preheater, the more and more serious ash blocking degree is realized, the designed smoke side resistance of the air preheater is usually about 1000Pa, the actual smoke side resistance is about 3000Pa, and some smoke side resistance is as high as 4000Pa, when a heat storage element is just changed into the primary air or the secondary air, the temperature is the lowest, and the outlet temperature of a smoke bin is lower, and when the heat storage element and the secondary air are, the invention installs sub-smoke sub-bins in the low-temperature corrosion danger area in the smoke channel, so that the original smoke bin is improved into a 1+1 smoke bin, the smoke sub-bins become independent and isolated smoke channels, and a smoke flow adjusting device is configured for the sub-smoke bins, the smoke temperature and the outlet speed of the sub-smoke bins are controlled by the smoke flow adjusting device, thereby realizing the unbalanced control of the smoke bin flow, eliminating the ash blocking phenomenon when the heat storage element rotates to the low-temperature corrosion danger area, and further eliminating the low-temperature corrosion danger area, the inclination of the guide plate is changed through the steering connecting rod, and then the inclination of the guide plate is adjusted in real time according to the smoke temperature detected by the sub-bin smoke temperature measuring instrument, so that the smoke temperature of the sub-bin outlet flue is adjusted, and then real-time adjustment is completed.
A flue gas circulation downstream ash blockage prevention system comprises: the smoke guiding device comprises a smoke channel inlet 1, a guide plate 2, a guide movable plate 201, a guide fixed plate 202, a steering fixed block 203, a guide first connecting rod 204, a guide second connecting rod 205, a guide rotating shaft 206, a guide third connecting rod 207, a guide fourth connecting rod 208, a guide fifth connecting rod 209, a smoke sub-bin 3, a smoke sub-bin 4, a sub-bin outlet flue 5, a sub-bin smoke temperature measuring instrument 6, a pressure measuring instrument 7, an expansion joint 8, an air damper 9, a smoke guiding machine 10, a filter cover, a smoke guiding inlet 1002, a smoke guiding motor 1003, a smoke guiding shell 1004, a smoke guiding outlet 1005, a smoke outlet pipeline 11 and a smoke channel outlet 12.
The smoke channel is arranged in the air preheater body, and a secondary air channel adjacent to the smoke channel and a primary air channel adjacent to the secondary air channel are also arranged in the air preheater body;
install flue gas branch storehouse 3 in the flue gas passageway, 3 lateral parts in flue gas branch storehouse are installed flue gas and are divided storehouse 4, flue gas is divided storehouse 4 and is configured flue gas flow adjusting device.
Flue gas flow adjusting device is including installing deflector 2 in the flue gas passageway, with the sub-branch storehouse export flue 5 that the sub-storehouse 4 intercommunication of flue gas divides, installs in proper order expansion joint 8, air damper 9 and the smoke machine 10 on the sub-storehouse export flue 5, and with the flue gas outlet pipe way 11 that sub-storehouse export flue 5 intercommunication divides, sets up deflector 2 mainly in order can divide the flue gas direction flue gas sub-storehouse 4 of storehouse 4 remote department apart from flue gas with flue gas passageway entry 1, and then increases flue gas velocity of flow and flue gas temperature in the sub-storehouse 4 of flue gas, and then accomplishes the sub-storehouse 4 of flue gas and to the erodeing of heat accumulation component.
A smoke rotary driving component is arranged below the guide plate 2, the smoke rotary driving component comprises a spiral shell which is arranged below the guide plate 2 and is fixedly connected with the smoke sub-bin 4, a spiral rotating shaft which is inserted into the spiral shell, and a spiral blade which is sleeved with the spiral rotating shaft, and spiral notches are formed in the side walls of the smoke sub-bin 4; the inner wall of the sub-bin outlet flue 5 is provided with a spiral cut; the spiral connector is gradually reduced from the smoke channel inlet 1 to the smoke channel outlet 12, the density of the spiral cut arranged from the smoke channel inlet 1 to the smoke channel outlet 12 is gradually increased, the smoke rotary driving component is designed to mainly drive smoke to spirally rotate through the sub-bin outlet flue 5, further matching with the spiral cut-out on the side wall of 4 of the smoke sub-bin to lead the smoke to rotate spirally to form a micro tornado, further, the flue gas tornado is attached with centrifugal force, so that when the heat storage element is purged, the device has effective auxiliary function for preventing the blockage of the air preheater, simultaneously, as the flue gas passes through the flue gas rotary driving component and forms a tornado with centrifugal force with the flue gas sub-bin 4 and the sub-bin outlet flue 5, further, dust attached to the heat storage element can be more effectively purged when the heat storage element is purged; and the tail end of the spiral rotating shaft is provided with a spiral motor.
When the rotor rotates for one circle, the small bin lattice rotates from the initial end to the tail end of the smoke sub-bin 3, passes through the air bin and then returns to the initial end of the smoke, and then rotates repeatedly along with the rotation of the rotor; the air bin is a secondary air channel and a primary air channel.
When a certain small bin in the air preheater rotor enters the flue gas channel from the air bin, at the initial end (end A) of the flue gas sub-bin 3, the wall temperature of the heat storage element of the small bin reaches the lowest value (in a low-temperature corrosion danger area shown in figure 3), the heat transfer temperature difference between the flue gas passing through the channel and the heat storage element is the largest, the heat exchange is the largest, then the heat storage element continuously absorbs the heat from the flue gas along with the rotation of the small bin, the temperature of the heat storage element per se continuously rises, when the temperature reaches the tail end (end B), the temperature of the heat storage element of the small bin reaches the highest, on the other hand, the heat transfer temperature difference between the heat storage element of the small bin and the flue gas continuously decreases along with the rotation of the small bin, the heat absorption capacity of the heat storage element continuously decreases along with the rotation of the small bin, and at the tail end, the temperature of the heat storage.
Under the condition that the temperature of the smoke at the inlet of the air preheater is uniformly distributed and the flow of the smoke passing through the small bin is unchanged, when a certain small bin of the rotor rotates for one circle, the heat storage element arranged in the small bin rotates to the tail end (B end) from the initial end (A end) of the smoke sub-bin 3, because the heat absorption capacity of the heat storage element is continuously reduced, the temperature of the wall surface of the heat storage element is gradually increased, and the temperature of the smoke at the outlet of the air preheater is also gradually increased.
The actual inlet flue gas temperature of the air preheater is uniformly distributed, and the flue gas flow passing through the small bin is basically unchanged, so that the temperature rise of the heat storage element and the temperature rise of the flue gas channel outlet 12 of the heat storage element are in a rule of gradual rise.
Under the above conditions (i.e. the actual condition of the air preheater), the temperature distribution of each small bin at the same time is observed, and the temperature distribution law (spatially) of the heat storage element of each small bin and the temperature distribution law (temporally) of the flue gas channel outlet 12 of each small bin at any time are completely the same as the temperature rise law (temporally) of the heat storage element of each small bin and the temperature of the flue gas channel outlet 12 of a single small bin of the air preheater when the single small bin rotates for one circle. That is, at any moment, the temperature distribution of each small-bin heat storage element of the air preheater shows a gradually-rising distribution rule from the initial end to the tail end, and the temperature distribution of the flue gas shows a gradually-rising distribution rule from the initial end to the tail end of the flue gas sub-bin 3.
The temperature of the air preheater flue gas channel outlet 12 (i.e., the flue gas temperature) is at its highest. As shown in fig. 2.
From the characteristics, at any moment, the temperature of the heat storage element of the small bin at the initial end of the smoke branch bin 3 and the temperature of the smoke channel outlet 12 of the heat storage element of the small bin at the low-temperature corrosion dangerous area are the lowest, adjacent to the smoke channel outlet 12 of the small bin, and the like, and the temperature of the heat storage element of the small bin and the temperature of the smoke channel outlet 12 of the small bin are sequentially reduced, so that the lowest temperature of the heat storage element is superposed with the lowest temperature of the smoke channel outlet 12, the initial end of the smoke branch bin 3 becomes the source of the dust blockage of the air preheater to form the low-temperature corrosion dangerous area, the dust blockage phenomenon of the heat storage element of each small bin of the rotor is inevitably generated when the small bin rotates through the area, if the dust blockage phenomenon does not occur when the small bin of the rotor of the air preheater body rotates through the low-temperature corrosion dangerous area, and the temperature of the heat storage element and the smoke discharge of the small bin are higher than the low-, when the air preheater rotates in the smoke sub-bin 3, the low-temperature corrosion and ash blockage phenomenon can not be generated.
The flue gas flow passing through each small bin is changed, so that the flow is gradually reduced from the initial end to the tail end of the flue gas. Therefore, the temperature of the heat storage element and the temperature of the outlet 12 of the flue gas channel are improved due to the increase of the flow of the flue gas, and theoretically, the temperature of the heat storage element of each small bin and the distribution deviation of the temperature of the outlet of each small bin are very small, so that the temperature of the flue gas tends to be basically balanced.
The flue gas flow passing through each small bin is changed, so that the flue gas flow of the initial section is greatly improved relatively, and unbalanced control of the flue gas flow is realized. The final purpose is: the temperature of the heat storage element of the small bin at the initial end is greatly improved (the temperature difference with the acid dew point temperature is within 10 ℃), more importantly, the temperature of the flue gas channel outlet 12 (namely the exhaust gas temperature) is greatly improved to be more than 150 ℃, so that ammonium bisulfate can not be solidified on the heat storage element, and meanwhile, the end exhaust gas temperature is reduced, thereby effectively preventing the ash blockage of the air preheater body, and also ensuring that the heat loss of the exhaust gas of the boiler is increased to the minimum without increasing, or even possibly slightly reducing.
Through the improvement of the sub-bin of the flue gas bin, and the arrangement of matched equipment and a system for the sub-bin, in practice, the flow rate and the temperature (including the temperature of a heat storage element) of the flue gas passing through a low-temperature corrosion dangerous area can be greatly improved, so that the temperature of the flue gas channel outlet 12 of the sub-bin 4 of the flue gas is always maintained above 150 ℃ (determined according to the anti-blocking requirement, the temperature of the heat storage element is within 10 ℃ of the acid dew point temperature), the ammonium bisulfate in the flue gas can not be solidified on the heat storage element of the air preheater, and the sulfuric acid gas in the flue gas can not be solidified on the heat storage element. The temperature of the heat storage element can be increased to 200 ℃ when necessary so as to melt ammonium bisulfate solidified on the heat storage element, the blocking phenomenon of the air preheater is thoroughly prevented, and secondly, the flue gas flow of the flue gas sub-bin 4 is greatly increased, so that the sweeping effect of the ash-carrying flue gas on the heat storage element can be accelerated, and the blocking prevention effect of the air preheater is effectively assisted.
The smoke outlet pipeline 11 is communicated with the smoke guiding machine 10; the smoke guiding machine 10 is adjacent to the position of the air damper 9, the sub-bin smoke temperature measuring instrument 6 and the pressure measuring instrument 7 adjacent to the sub-bin smoke temperature measuring instrument 6 are further installed on the sub-bin outlet flue 5, the sub-bin smoke temperature measuring instrument 6 and the sub-bin smoke temperature measuring instrument 6 are arranged, and the control of the output of the smoke guiding machine 10 and the opening degree of the adjusting valve can be realized through the real-time measurement feedback of the sub-bin smoke outlet temperature.
The air damper 9 is arranged between the expansion joint 8 and the smoke guiding machine 10; the smoke outlet pipeline 11 is communicated with the smoke channel outlet 12, the expansion joint 8 is designed to ensure the balanced thermal expansion of the sub-bin outlet flue 5, the service life of the sub-bin outlet flue 5 is prolonged, the output adjustment of the smoke inducing machine 10 can greatly improve the smoke flow passing through the smoke sub-bin 4, and the smoke temperature at the outlet of the smoke outlet pipeline 11 is controlled, so that the unbalanced control of the flow passing through the smoke sub-bin 3 is realized, and the low-temperature corrosion danger zone is eliminated.
The guide plate 2 comprises a guide fixing plate 202 fixedly arranged on the flue gas channel and a guide movable plate 201 movably connected with the guide fixing plate 202; the lateral part of the guide movable plate 201 is provided with a steering connecting rod, the guide plate 2 is designed into two parts, the guide movable plate 201 is not adjusted mainly when the temperature and the flow rate of the flue gas in the flue gas sub-bin 4 are enough, and the guide movable plate 201 needs to be adjusted when the temperature and the flow rate of the flue gas in the flue gas sub-bin 4 are not enough, so as to ensure that the flow rate and the temperature of the flue gas in the flue gas sub-bin 4 are enough.
The steering connecting rod comprises a steering fixing block 203 fixedly connected with the steering movable plate 201, a steering first connecting rod 204 rotatably connected with the steering fixing block 203, a steering second connecting rod 205 hinged with the steering first rail, a steering rotating shaft 206 fixedly connected with the steering second connecting rod 205, a steering third connecting rod 207 fixedly connected with the steering rotating shaft 206, a steering fourth connecting rod 208 hinged with the steering third connecting rod 207, and a steering fifth connecting rod 209 hinged with the steering fourth connecting rod 208, the steering connecting rod is designed, the steering connecting rod is mainly used for driving the steering movable plate 201 to rotate so as to complete the adjustment of the inclination angle of the steering movable plate 201, the steering connecting rod is rotated by a steering rotating motor so as to drive the steering fifth connecting rod 209 to swing, and then the steering fifth connecting rod 209 drives the steering fourth connecting rod 208 to swing, and then the guiding third connecting rod 207 is driven to swing, and further the guiding rotating shaft 206 is driven to rotate, and further the guiding second connecting rod 205 is driven to swing, and further the guiding first connecting rod 204 is driven to move back and forth, and further the steering fixing block 203 is driven to move back and forth, and further the work of the steering connecting rod is completed.
The guiding fifth connecting rod 209 is externally connected with a guiding rotating motor.
The smoke guiding machine 10 comprises a filter cover 1001 communicated with the sub-bin outlet flue 5, a smoke guiding inlet 1002 communicated with the filter cover 1001, a smoke guiding shell 1004 communicated with the smoke guiding inlet 1002, and a smoke guiding outlet 1005 communicated with the smoke guiding shell 1004; the smoke guide outlet 1005 is communicated with the smoke outlet pipeline 11; a smoke guiding motor 1003 is installed on the side of the smoke guiding shell 1004, and smoke guiding fan blades which rotate coaxially with the smoke guiding motor 1003 are installed in the smoke guiding shell 1004; the filter housing 1001 is detachably connected with the smoke-guiding inlet 1002 and the sub-bin outlet flue 5, the filter housing 1001 which can be detached is designed, and the filter housing is mainly used for filtering smoke passing through the filter housing 1001, so that dust is filtered, and the abrasion of the dust in the smoke to the blades is prevented.
Description of the working principle: the method is characterized in that the situation that the ash blockage phenomenon is easy to occur when the heat storage elements of each small bin of a rotor pass through the area due to low flue gas temperature and low flue gas flow is prevented from occurring when the heat storage elements of the small bins of the rotor rotate to pass through the area because the heat storage elements in the air preheater are just the lowest in temperature of heat exchange in primary air or secondary air and the outlet temperature of the flue gas bin is lower, and the heat storage elements are overlapped, the initial end of the flue gas bin becomes the source of the ash blockage of the air preheater, so that a low-temperature corrosion dangerous area is formed; at this time, the inclination angle of the guide movable plate 201 in the guide plate 2 is controlled by the steering connecting rod, and at this time, the guide rotating motor rotates to drive the guide fifth connecting rod 209 to swing, and then the guide fifth connecting rod 209 drives the guide fourth connecting rod 208 to swing, and then the guide third connecting rod 207 is driven to swing, and then the guide rotating shaft 206 is driven to rotate, and then the guide second connecting rod 205 is driven to swing, and then the guide first connecting rod 204 is driven to move back and forth, and then the guide fixed block 203 is driven to move back and forth, and then the guide movable plate 201 is driven to swing left and right along the guide fixed plate 202, so that the inclination adjustment of the guide movable plate 201 is completed; when the flue gas at the position of the flue gas channel inlet 1 far away from the flue gas sub-warehouse 4 is guided into the flue gas sub-warehouse 4, a signal is fed back through the sub-warehouse flue gas temperature measuring instrument 6, so that the opening degree of the air door 9 is controlled, the flow of the flue gas entering the flue gas sub-warehouse 4 is regulated, and the temperature of the flue gas outlet of the flue gas sub-warehouse 4 is ensured to be within a preset range; the output adjustment of the smoke guiding machine 10 can greatly improve the smoke flow passing through the smoke sub-bin 4 and control the smoke temperature of the smoke channel outlet 12, thereby realizing the non-balance control of the flow passing through the smoke sub-bin 4, further changing the smoke temperature and the smoke flow speed passing through the low-temperature corrosion danger area and eliminating the effect of the low-temperature corrosion danger area; the smoke inducing machine 10 rotates through the smoke inducing motor 1003 to drive the smoke inducing fan blade to rotate, then the smoke in the smoke sub-bin 4 is sucked into the smoke inducing inlet 1002 after being filtered by the filter cover 1001, the smoke enters the smoke inducing shell 1004 through the smoke inducing inlet 1002 and flows to the smoke outlet pipeline 11 through the smoke inducing outlet 1005, when the smoke flow of the smoke sub-bin 4 is greatly improved, the sweeping effect of the filtered smoke with ash on the heat storage element can be accelerated, the blockage prevention effect on the air preheater is effectively assisted, the smoke drives the spiral blade to rotate through the spiral motor, the smoke is further driven to enter the smoke sub-bin and enter the sub-bin outlet flue, at the moment, because the inner walls of the smoke sub-bin and the sub-bin outlet flue are provided with downward spiral notches, the density is increased from top to bottom, the smoke rotates spirally in the smoke sub-bin and the sub-bin outlet flue, further, a tornado is formed and is accompanied by centrifugal force, so that dust attached to the heat storage element can be more effectively swept when the heat storage element is swept, and in addition, the output of the smoke guiding machine 10 and the control of the opening degree of the regulating valve can be realized by the real-time measurement feedback of the sub-bin smoke temperature measuring instrument 6 on the sub-bin smoke outlet temperature; the expansion joint 8 arranged on the sub-bin outlet flue 5 can ensure that the sub-bin outlet flue 5 has balanced thermal expansion when the guide plate 2 guides the flue gas at the position, far away from the flue gas sub-bin 4, of the flue gas channel inlet 1 to the flue gas sub-bin 4, so that the service life of the sub-bin outlet flue 5 is prolonged.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the embodiments, and various equivalent changes can be made to the technical solution of the present invention within the technical idea of the present invention, and these equivalent changes are within the protection scope of the present invention.
Claims (9)
1. The utility model provides a stifled grey system is prevented to flue gas circulation following current, characterized by includes:
a base assembly including an air preheater body; the air preheater body comprises a flue gas channel, a secondary air channel adjacent to the flue gas channel and a primary air channel adjacent to the secondary air channel;
the anti-blocking component comprises a smoke sub-bin arranged on the side part of the smoke sub-bin, a smoke sub-bin arranged on the side part of the smoke sub-bin and a smoke flow adjusting device arranged for the smoke sub-bin.
2. The flue gas circulation downstream ash blockage prevention system as claimed in claim 1, which is characterized in that: the flue gas flow adjusting device comprises a guide plate arranged in a flue gas channel, a sub-bin outlet flue communicated with the flue gas sub-bin, an expansion joint, an adjusting air door and a smoke guiding machine which are sequentially arranged on the sub-bin outlet flue, and a flue gas outlet pipeline communicated with the sub-bin outlet flue.
3. The flue gas circulation downstream ash blockage prevention system as claimed in claim 2, which is characterized in that: the smoke outlet pipeline is communicated with the smoke guiding machine; the smoke guiding machine is adjacent to the position of the air adjusting door, and a sub-bin smoke temperature measuring instrument and a pressure measuring instrument adjacent to the sub-bin smoke temperature measuring instrument are further installed on the sub-bin outlet flue.
4. The flue gas circulation downstream ash blockage prevention system as claimed in claim 2, which is characterized in that: the air damper is arranged between the expansion joint and the smoke guiding machine; the flue gas outlet pipeline is communicated with the outlet of the flue gas channel.
5. The flue gas circulation downstream ash blockage prevention system as claimed in claim 2, which is characterized in that: the guide plate comprises a guide fixed plate fixedly arranged on the smoke channel and a guide movable plate movably connected with the guide fixed plate; and a steering connecting rod is arranged on the side part of the guide movable plate.
6. The flue gas circulation downstream ash blockage prevention system as claimed in claim 5, which is characterized in that: the steering connecting rod includes with direction fly leaf fixed connection turn to the fixed block, with turn to the fixed block and rotate the first connecting rod of direction of connecting, with the first railing articulated direction second connecting rod of direction, with direction second connecting rod fixed connection's direction pivot, with direction pivot fixed connection's direction third connecting rod, with direction third connecting rod articulated direction fourth connecting rod, and with direction fourth connecting rod articulated direction fifth connecting rod.
7. The flue gas circulation downstream ash blockage prevention system as claimed in claim 6, wherein: and the guide fifth connecting rod is externally connected with a guide rotating motor.
8. The flue gas circulation downstream ash blockage prevention system as claimed in claim 2, which is characterized in that: the smoke guiding machine comprises a filter hood communicated with the sub-bin outlet flue, a smoke guiding inlet communicated with the filter hood, a smoke guiding shell communicated with the smoke guiding inlet, and a smoke guiding outlet communicated with the smoke guiding shell; the smoke guide outlet is communicated with the smoke outlet pipeline; a smoke guiding motor is installed on the side of the smoke guiding shell, and a smoke guiding fan blade which rotates coaxially with the smoke guiding motor is installed in the smoke guiding shell; the filter mantle is detachably connected with the smoke guiding inlet and the sub-bin outlet flues.
9. A flue gas circulation downstream ash blocking prevention method is characterized by comprising the following steps:
step 1, preventing a heat storage element in an air preheater from having the lowest temperature when the heat storage element is just exchanged in primary air or secondary air, and preventing the temperature of an outlet of a flue gas bin from being lower, when the heat storage element and the flue gas bin are overlapped, an initial end of the flue gas bin becomes a source of ash blockage of an air preheater to form a low-temperature corrosion dangerous area, and when the heat storage element of each small bin of a rotor passes through the area in a rotating mode, the heat storage element is easy to have the ash blockage phenomenon when passing through the area due to the lower flue gas temperature and the lower flue gas flow, firstly, the inclination of a guide plate is controlled through a steering connecting rod, and then flue gas at a position, far away from a flue gas sub-bin, of an inlet of a flue gas; at the moment, a guide movable plate in the guide plate controls the inclination angle of the guide movable plate through a steering connecting rod, at the moment, a guide rotating motor rotates to drive a guide fifth connecting rod to swing, the guide fifth connecting rod drives a guide fourth connecting rod to swing, the guide third connecting rod is driven to swing, a guide rotating shaft is driven to rotate, the guide second connecting rod is driven to swing, the guide first connecting rod is driven to move back and forth, a steering fixed block is driven to move back and forth, the guide movable plate is driven to swing left and right along the guide fixed plate, and the inclination of the guide movable plate is adjusted;
step 2, after the flue gas at the position, far away from the flue gas sub-bin, of the inlet of the flue gas channel is guided into the flue gas sub-bin, a sub-bin flue gas temperature measuring instrument feeds back a signal, so that the opening of an air adjusting door is controlled, the flow of the flue gas entering the flue gas sub-bin is adjusted, and the temperature of the flue gas outlet of the flue gas sub-bin is ensured to be within a preset range;
3, the output adjustment of the smoke guiding machine can greatly improve the smoke flow passing through the smoke sub-bin and control the smoke temperature at the outlet of the sub-smoke channel, thereby realizing the non-balanced control of the smoke sub-bin flow, further changing the smoke temperature and the smoke flow speed passing through the low-temperature corrosion dangerous area and eliminating the effect of the low-temperature corrosion dangerous area; the smoke guiding machine rotates through the smoke guiding motor to drive the smoke guiding fan blades to rotate, smoke in the smoke sub-bins is filtered by the filter hoods and then sucked into the smoke guiding inlet, enters the smoke guiding shell through the smoke guiding inlet and flows to the smoke outlet pipeline through the smoke guiding outlet;
step 4, when the flue gas flow of the sub-bin of the flue gas is greatly improved, the purging effect of the filtered flue gas with ash on a heat storage element can be accelerated, the anti-blocking effect of an air preheater is effectively assisted, and in addition, the control on the output of a smoke guiding machine and the opening degree of an adjusting valve can be realized by the real-time measurement and feedback of the sub-bin flue gas temperature measuring instrument on the temperature of the sub-bin flue gas outlet;
and 5, the expansion joint arranged on the sub-bin outlet flue can ensure the balanced thermal expansion of the sub-bin outlet flue when the guide plate guides the flue gas at the position, far away from the flue gas sub-bin, of the flue gas channel inlet to the flue gas sub-bin, so that the service life of the sub-bin outlet flue is prolonged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010097082.1A CN111237800A (en) | 2020-02-17 | 2020-02-17 | Smoke circulation downstream ash blocking prevention system and ash blocking prevention method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010097082.1A CN111237800A (en) | 2020-02-17 | 2020-02-17 | Smoke circulation downstream ash blocking prevention system and ash blocking prevention method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111237800A true CN111237800A (en) | 2020-06-05 |
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ID=70867122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010097082.1A Withdrawn CN111237800A (en) | 2020-02-17 | 2020-02-17 | Smoke circulation downstream ash blocking prevention system and ash blocking prevention method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN111237800A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115888465A (en) * | 2022-08-29 | 2023-04-04 | 西安热工研究院有限公司 | Rotary driving system suitable for long-term operation of high-temperature and high-dust flue gas |
-
2020
- 2020-02-17 CN CN202010097082.1A patent/CN111237800A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115888465A (en) * | 2022-08-29 | 2023-04-04 | 西安热工研究院有限公司 | Rotary driving system suitable for long-term operation of high-temperature and high-dust flue gas |
| CN115888465B (en) * | 2022-08-29 | 2024-06-07 | 西安热工研究院有限公司 | Rotary driving system suitable for long-term operation of high-temperature high-dust flue gas |
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Application publication date: 20200605 |