CN110017499B - Method for preventing blockage of cold-end heat storage element of air preheater in ring-dividing manner - Google Patents
Method for preventing blockage of cold-end heat storage element of air preheater in ring-dividing manner Download PDFInfo
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- CN110017499B CN110017499B CN201910268427.2A CN201910268427A CN110017499B CN 110017499 B CN110017499 B CN 110017499B CN 201910268427 A CN201910268427 A CN 201910268427A CN 110017499 B CN110017499 B CN 110017499B
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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
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- 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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Abstract
The invention discloses a method for preventing blockage of a heat storage element at the cold end of an air preheater in a ring-dividing manner. The invention achieves the purpose of reducing the using amount of the anti-blocking ash hot air on the premise of ensuring the anti-blocking ash effect of the air preheater by reducing the through-flow cross section of the anti-blocking ash hot air at the same time and reducing the unorganized air leakage of the anti-blocking ash bin, and has the outstanding advantages of investment saving, low operating cost, obvious anti-blocking effect and the like.
Description
Technical Field
The invention relates to a ring-dividing anti-blocking method for a heat storage element at the cold end of an air preheater, and belongs to the technical field of anti-blocking ash of air preheaters.
Background
A rotary air preheater (referred to as "air preheater") is a heat exchange device for large utility boilers, which uses the heat of boiler flue gas to heat the air required for combustion, thereby increasing the efficiency of the boiler.
The main focus of concern for air preheaters includes ash blockage, high air leakage rate, low heat transfer efficiency, severe low temperature corrosion, etc., which have long affected the safe and economic operation of air preheaters and the entire boiler system.
The above problems have been known for a long time, and they are mutually promoted and influenced. In recent years, with the widespread operation of denitration systems, the operation environment of the air preheater is changed, and the problem of ash blockage is particularly prominent, and the treatment is difficult and complicated.
At present, flue gas denitration facilities additionally arranged in a coal-fired power plant mainly adopt a Selective Catalytic Reduction (SCR) technology. After the SCR denitration process is adopted, part of SO in the flue gas2Oxidizing the denitrified catalyst into SO3Increase SO in the flue gas3The volume concentration of (A), together with the presence of the inevitable ammonia slip phenomenon, results in ammonium bisulfate (NH)4HSO4) And the generation of a large amount of byproducts, and the increase of the acid dew point temperature of the flue gas, which leads to the aggravation of low-temperature corrosion.
Ammonium bisulfate (NH) as a by-product4HSO4) The molten heat storage element is firmly adhered to the surface of a heat storage element of the air preheater within the temperature range of 146-207 ℃, so that the heat storage element is corroded and deposited with dust, and finally, the dust is easily blocked, so that great hidden danger is caused to the safe operation of a unit. The load limiting of the unit is caused by the fact that part of domestic existing power plants cannot solve or relieve the problem, and even the power plants are forced to stop.
When the temperature of the exhaust gas is lower than the acid dew point, the sulfuric acid vapor is condensed, and the sulfuric acid liquid drops are attached to the cold-end heat storage element to corrode the heat storage element. Acid dew point of flue gas with SO3The concentration is increased, generally reaching 130-160 ℃. Because the denitration system increases SO2To SO3The conversion rate of (2), namely, the SO in the flue gas is improved3The sulfur content of the actual coal is generally higher than that of the designed coal in order to control the power generation cost of a power plantTherefore, the acid dew point of the existing power plant is higher than the exhaust gas temperature, so that the low-temperature corrosion (acid dew point corrosion) is aggravated, and the problem of ash blockage is quite prominent.
It is determined from the above physical properties of sulfuric acid and ammonium bisulfate that sulfuric acid is mainly deposited on the lower portion of the cold-end heat storage element, and ammonium bisulfate is mainly deposited on the middle upper portion of the cold-end heat storage element. At present, air heater adopts hot-blast anti-blocking scheme against current to have the application, but because usable prevents stifled grey hot-blast flowrate limited, prevents stifled grey hot-blast velocity of flow just lower when the through-flow cross-section is great, and the heat mainly passes to cold junction heat storage element, though the glutinous ash of sulfuric acid type can clear away, but goes deep into the glutinous ash of the ammonium bisulfate type on upper portion in the heat storage element, and it is not good to clear away the effect. The reason is that when the flow rate of the ash-blocking-preventing hot air is low, the temperature drop of the hot air flowing through the ammonium bisulfate deposition zone is large, the hot air is not enough to gasify the ammonium bisulfate, and the flowing speed is reduced, so that ammonium bisulfate type sticky ash is not enough to be carried; in addition, the cold end heat storage element runner can not guarantee to be totally closed, and local high-flow-rate prevents that stifled grey hot air blows into the heat storage element after, and in cold end heat storage element internal diffusion can't link up and keep whole high-flow-rate state.
Disclosure of Invention
The invention provides a method for preventing blocking of a heat storage element at the cold end of an air preheater in a ring-dividing manner, aiming at solving the problem of dust blocking of the existing air preheater and improving the effect of preventing dust blocking of hot air in a reverse flow manner.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a method for preventing blocking of a cold-end heat storage element of an air preheater in a ring-dividing mode is characterized in that a partition plate is arranged on the cold-end face of a rotor of the air preheater, the cold-end face is divided into two or more independent air inlet channels, and the air inlet channels are blown by anti-blocking ash hot air respectively to prevent blocking.
As the common sense, be the cold junction at air heater rotor one end, the other end is the hot junction, and general case, cold junction are down, the hot junction is last, and this application is no longer repeated.
Set up the baffle at air heater rotor cold junction terminal surface, divide the cold junction terminal surface into two and above independent inlet channel, also utilize the baffle that air heater rotor cold junction terminal surface set up to divide the cold junction terminal surface into two above independent inlet channel.
The ash blockage preventing hot air can be taken from hot primary air or hot secondary air and/or hot end air leakage. The ash blocking preventing hot air enters from the cold end of the rotor and flows out from the hot end of the rotor to purge the heat accumulating elements flowing through.
By adopting the scheme, the diffusion loss of the anti-blocking ash hot air is effectively avoided, the high flow speed state of the anti-blocking ash hot air in the whole process is ensured to the maximum extent, and the removal effect of substances such as sulfuric acid, ammonium bisulfate and the like is obviously improved.
Preferably, each air inlet channel is provided with an anti-blocking ash air chamber which is independently communicated with the air inlet channel, and the corresponding air inlet channel is swept by anti-blocking ash hot air in the anti-blocking ash air chamber to prevent blocking.
Each air inlet channel is provided with an anti-blocking ash air chamber which is independently communicated with the air inlet channel, namely, one air inlet channel corresponds to one anti-blocking ash air chamber, and anti-blocking ash hot air in the anti-blocking ash air chamber sweeps the corresponding air inlet channel from bottom to top to prevent blocking.
The applicant finds that by adopting the technical scheme, under the condition of ensuring the ash blockage prevention effect of the air preheater, the amount of ash blockage prevention hot air can be greatly reduced, so that the energy consumption for conveying the ash blockage prevention hot air is saved, and the adverse effect of the ash blockage prevention hot air input from the cold end on the heat exchange performance of the air preheater is also reduced.
In order to simplify the structure and ensure the anti-blocking effect, the upper reaches of all the anti-blocking ash wind chambers are converged in the same anti-blocking ash wind chamber, and the anti-blocking ash hot air wheels in the anti-blocking ash wind chambers are used for sweeping all the air inlet channels for blocking prevention. That is, at the same time, the anti-blocking ash hot air is introduced into only one anti-blocking ash air chamber to purge the corresponding air inlet channel. Of course, no matter which air inlet channel is purged, the air inlet channel firstly passes through the corresponding anti-blocking ash air chamber.
The direction of the ash blocking prevention air chamber upstream to the downstream is also the flowing direction of the ash blocking prevention hot air in the ash blocking prevention air chamber.
In order to facilitate control and adjustment, each anti-blocking ash air chamber is provided with an anti-blocking hot air adjusting door, and the anti-blocking ash hot air amount in each anti-blocking ash air chamber is independently adjusted and controlled through an actuator. When the circulation sweeps, the cold end circulation of the heat storage element in each air inlet channel sweeps the ash-blocking-preventing hot air, the ash-blocking-preventing hot air is introduced into only one ash-blocking-preventing air chamber in the same time period, and the other ash-blocking-preventing hot air adjusting doors corresponding to the ash-blocking-preventing air chambers are completely closed.
In order to facilitate control and ensure the anti-blocking effect, the partition plate is a circumferential partition plate with a circular ring structure, and the circumferential partition plate is provided with n channels and divides the cold end surface into n +1 independent annular air inlet channels.
Further preferably, all circumferential partition plates are coaxially arranged, and the cold end face is virtually divided into n +1 independent concentric ring air inlet channels. More preferably, 1. ltoreq. n.ltoreq.5. The present application is "concentric" i.e. coaxial.
For improving the utilization efficiency of the anti-blocking ash hot air and reducing the leakage rate of the cold end of the anti-blocking ash bin, the middle radial partition plate connected with the circumferential partition plate is arranged on the end face of the cold end of the rotor of the annular air inlet channel of the outermost ring at least. The intermediate radial partition is arranged along the radial direction of the rotor. By adopting the technical measures, when the air preheater rotor is deformed like a mushroom, radial air leakage of the outer ring at the cold end can be greatly reduced, on one hand, the air leakage rate of the air preheater is favorably reduced, and on the other hand, the unorganized air leakage of the ash blockage prevention bin is reduced.
Preferably, each rotor bin lattice corresponds to one middle radial partition plate, and the middle radial partition plates are arranged along the bisector of the corresponding rotor bin lattice.
As a general knowledge, n radial baffles are arranged on the rotor, the rotor is divided into n rotor bin grids, every two adjacent radial baffles form one rotor bin grid, and the heat storage element is arranged in the rotor bin grid, so that the application is not repeated.
For further improving the utilization efficiency of the anti-blocking ash hot air and reducing the leakage rate of the cold end of the anti-blocking ash bin, the circumferential sealing piece is installed on the circumferential partition plate, and/or the middle radial sealing piece is installed on the middle radial partition plate.
In order to simplify the structure, guarantee the anti-blocking effect, convenient control, all be equipped with one on every annular inlet air duct rather than the stifled grey plenum of preventing of independent intercommunication, all prevent that the upper reaches of grey plenum all converge in same prevent stifled grey plenum, all be equipped with on every prevent stifled grey plenum and prevent stifled hot-blast regulating gate, utilize prevent stifled grey hot-blast wheel in preventing stifled grey plenum to sweep each inlet air duct and prevent stifled.
According to the method for ring-dividing and anti-blocking of the heat storage elements at the cold end of the air preheater, the cold end of the air preheater is provided with an anti-blocking ash air box, anti-blocking ash hot air is introduced into the anti-blocking ash air box, the anti-blocking ash hot air sweeps the end face of the cold end of the rotor of the air preheater to construct an anti-blocking ash bin, the anti-blocking ash air box is composed of n +1 anti-blocking ash air chambers, and the cold end of each ring of heat storage elements is independently communicated with the corresponding anti; the anti-blocking ash hot air volume introduced into each anti-blocking ash air chamber can be independently adjusted and controlled through the anti-blocking hot air adjusting door.
As a disclosed technical scheme, the ash blockage preventing hot air is taken from hot primary air or hot secondary air and/or hot end leakage air, and the ash blockage preventing air box is arranged below the end face of the cold end of the air preheater rotor.
In order to improve the automatic commissioning level of the equipment, all the anti-blocking hot air adjusting doors (n + 1) are provided with pneumatic or electric actuating mechanisms, one of the anti-blocking hot air adjusting doors is automatically opened in turn according to the interval time set by program control, and the other anti-blocking hot air adjusting doors are kept closed.
In order to facilitate debugging and monitor the running state of the equipment, an anti-blocking ash hot air flow meter is arranged in the anti-blocking ash wind chamber at the upstream of all the anti-blocking ash wind chambers. Namely, the amount of the ash blocking prevention hot air introduced into each ash blocking prevention air chamber is monitored by sharing one flowmeter.
In order to monitor the effect of each ring of the heat storage elements at the cold end of the air preheater respectively, at least one ash blocking prevention hot air sampling port is arranged at the hot end of each ring of the heat storage elements and at the position corresponding to the outlet of the ash blocking prevention bin, the ash blocking prevention hot air flowing through the heat storage elements is taken out, and the dust concentration of the ash blocking prevention hot air is measured on line. The more the amount of dust carried out in the unit area of the end surface of the cold end of the heat storage element is, the more obvious the dust blocking tendency of the heat storage element blown by the dust blocking prevention hot air is; when the ash blockage prevention hot air volume introduced into one ash blockage prevention air chamber is increased, the monitored dust concentration is reduced, the ash blockage prevention effect corresponding to one ring of heat storage elements is good, and the ash blockage prevention hot air volume before increasing is the optimal air volume corresponding to one ring of heat storage elements.
The hot end of the air inlet channel, the hot end of the heat storage element and the like correspond to the hot end of the rotor; the cold end of the air inlet channel, the cold end of the heat storage element and the like correspond to the cold end of the rotor.
The prior art is referred to in the art for techniques not mentioned in the present invention.
The method for preventing the blockage of the heat storage element at the cold end of the air preheater in the invention has the following beneficial effects: the aim of reducing the amount of the anti-blocking ash hot air on the premise of ensuring the anti-blocking ash effect of the air preheater is fulfilled by reducing the anti-blocking ash hot air through-flow cross section at the same time and reducing the unorganized air leakage of the anti-blocking ash bin, and the method has the outstanding advantages of investment saving, low operating cost, obvious anti-blocking effect and the like.
Drawings
Fig. 1 is a schematic view of a ring-separation anti-blocking method for a heat storage element at a cold end of an air preheater of a 300 MW-class unit in embodiment 1 of the present invention.
FIG. 2 is a schematic view of the separation of the cold end face of the rotor of the air preheater in embodiment 1 of the present invention.
Fig. 3 is a schematic view of a ring-separation anti-blocking method for a heat storage element at the cold end of an air preheater of a 600 MW-class unit in embodiment 3 of the present invention.
FIG. 4 is a schematic view of the separation of the cold end face of the rotor of the air preheater in embodiment 3 of the present invention.
In the figure, 1 is a first circumferential baffle, 2 is a second circumferential baffle, 3 is a middle radial baffle, and 4 is an anti-blocking ash hot air flowmeter; 11 is a first anti-blocking ash air chamber, 12 is a second anti-blocking ash air chamber, and 13 is a third anti-blocking ash air chamber; 21 is a first anti-blocking hot air regulating door, 22 is a second anti-blocking hot air regulating door, and 23 is a third anti-blocking hot air regulating door.
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
Example 1
As shown in fig. 1-2, a method for preventing blockage of a heat storage element at the cold end of an air preheater in a ring-dividing manner, 1 first circumferential baffle plate with a circular ring structure is arranged on the cold end face of a rotor of an air preheater of a 300 MW-grade unit, the cold end face is divided into 2 independent coaxial annular air inlet channels, in order to improve the utilization efficiency of anti-blocking ash hot air and reduce the leakage rate of the cold end of an anti-blocking ash bin, the end surface of the cold end of the rotor of the annular air inlet channel at the outermost ring is provided with a middle radial clapboard connected with the circumferential clapboard, each rotor bin lattice corresponds to one middle radial clapboard, the middle radial clapboard is arranged along the angular bisector of the corresponding rotor bin lattice, by adopting the technical measures, when the air preheater rotor is subjected to mushroom-shaped deformation, radial air leakage of the outer ring at the cold end can be greatly reduced, so that the air leakage rate of the air preheater is favorably reduced, and the unorganized air leakage of the ash blocking prevention bin is reduced; each annular air inlet channel is provided with an anti-blocking ash air chamber which is independently communicated with the annular air inlet channel, namely 2 anti-blocking ash air chambers are arranged, namely a first anti-blocking ash air chamber and a second anti-blocking ash air chamber, the upstream of the first anti-blocking ash air chamber and the upstream of the second anti-blocking ash air chamber are converged in the same anti-blocking ash air chamber, the first anti-blocking ash air chamber is provided with a first anti-blocking hot air regulating door, the second anti-blocking ash air chamber is provided with a second anti-blocking hot air regulating door, the anti-blocking ash hot air in the anti-blocking ash air chamber is utilized to respectively pass through the first anti-blocking ash air chamber and the second anti-blocking ash air chamber to circularly sweep 2 independent coaxial annular air inlet channels, namely the anti-blocking ash hot air is introduced into one anti-blocking ash air chamber to sweep the corresponding air inlet channel, and the hot air regulating door corresponding to the other anti-blocking ash air chamber is.
The ash blockage preventing hot air can be hot primary air or hot secondary air and/or hot end air leakage.
By adopting the scheme, the diffusion loss of the anti-blocking ash hot air is effectively avoided, the high flow speed state of the anti-blocking ash hot air in the whole process is ensured to the maximum extent, and the removal effect of substances such as sulfuric acid, ammonium bisulfate and the like is obviously improved.
Practice proves that by adopting the technical scheme, under the condition of ensuring the ash blockage prevention effect of the air preheater, the using amount of the ash blockage prevention hot air can be reduced by 30-50%, so that the energy consumption of conveying the ash blockage prevention hot air is saved, and the adverse effect of cold end input ash blockage prevention hot air on the heat exchange performance of the air preheater is also reduced.
Example 2
On the basis of the embodiment 1, the following improvements are further made: for further improving the utilization efficiency of the anti-blocking ash hot air and reducing the leakage rate of the cold end of the anti-blocking ash bin, the circumferential sealing piece is installed on the circumferential partition plate, and the middle radial sealing piece is installed on the middle radial partition plate.
Example 3
As shown in fig. 3-4, in a method for preventing blockage of a heat storage element at a cold end of an air preheater, 2 circumferential partition plates (a first circumferential partition plate and a second circumferential partition plate, respectively) with a circular ring structure are arranged on the end surface of the cold end of a rotor of an air preheater of a 600 MW-class unit, and the end surface of the cold end is divided into 3 independent coaxial annular air inlet channels; each annular air inlet channel is provided with an anti-blocking ash air chamber which is independently communicated with the annular air inlet channel, namely 3 anti-blocking ash air chambers which are respectively a first anti-blocking ash air chamber, a second anti-blocking ash air chamber and a third anti-blocking ash air chamber, the upstream of the first anti-blocking ash air chamber, the upstream of the second anti-blocking ash air chamber and the upstream of the third anti-blocking ash air chamber are all converged in the same anti-blocking ash air chamber, the anti-blocking ash air chamber is internally provided with an anti-blocking ash hot air flow meter, the first anti-blocking ash air chamber is provided with a first anti-blocking hot air regulating door, the second anti-blocking ash air chamber is provided with a second anti-blocking hot air regulating door, the third anti-blocking ash air chamber is provided with a third anti-blocking hot air regulating door, anti-blocking ash hot air in the anti-blocking ash air chambers is respectively swept through 3 anti-blocking ash air chamber wheels to sweep 3 independent anti-blocking coaxial annular air inlet channels, namely, in, and the anti-blocking hot air adjusting doors corresponding to the other two anti-blocking ash air chambers are completely closed.
The ash blockage preventing hot air can be hot primary air or hot secondary air and/or hot end air leakage.
Practice proves that by adopting the technical scheme, under the condition of ensuring the ash blockage prevention effect of the air preheater, the amount of the ash blockage prevention hot air can be greatly reduced by about 40 percent, so that the energy consumption of ash blockage prevention hot air conveying is saved, and the adverse effect of cold end input ash blockage prevention hot air on the heat exchange performance of the air preheater is also reduced.
Example 4
On the basis of the embodiment 3, the following improvements are further made: in order to improve the automatic commissioning level of the equipment, 3 anti-blocking hot air adjusting doors are provided with pneumatic or electric actuating mechanisms, one of the anti-blocking hot air adjusting doors is automatically opened in turn according to the interval time set by program control, and the other anti-blocking hot air adjusting doors are kept closed.
Example 5
On the basis of the embodiment 4, the following improvements are further made: in order to monitor the anti-blocking effect of each ring of the heat storage elements at the cold end of the air preheater respectively, at least one anti-blocking hot air sampling port is arranged at the hot end of each ring of the heat storage elements and at the position corresponding to the outlet of the anti-blocking ash bin, the anti-blocking hot air which flows through the heat storage elements is taken out, and the dust concentration of the anti-blocking hot air is measured on line; the more the amount of dust carried out in the unit area of the end surface of the cold end of the heat storage element is, the more obvious the dust blocking tendency of the heat storage element blown by the dust blocking prevention hot air is; when the ash blockage prevention hot air volume introduced into one ash blockage prevention air chamber is increased, the monitored dust concentration is reduced, the ash blockage prevention effect corresponding to one ring of heat storage elements is good, and the ash blockage prevention hot air volume before increasing is the optimal air volume corresponding to one ring of heat storage elements.
According to the method for preventing the blockage of the heat storage elements at the cold end of the air preheater in the various embodiments, the purpose of reducing the amount of the anti-blocking ash hot air on the premise of ensuring the anti-blocking effect of the air preheater is achieved by reducing the anti-blocking ash hot air through-flow cross section in the same time period and reducing the unorganized air leakage of the anti-blocking ash bin, and the method has the outstanding advantages of low investment, low operating cost, obvious anti-blocking effect and the like.
Claims (6)
1. A method for preventing blockage of a heat storage element at a cold end of an air preheater in a ring-dividing manner is characterized by comprising the following steps: the cold end face of the air preheater rotor is provided with a partition plate, the cold end face is divided into two or more independent air inlet channels, and the air inlet channels are respectively swept by anti-blocking ash hot air to carry out anti-blocking;
each air inlet channel is provided with an anti-blocking ash air chamber which is independently communicated with the air inlet channel, and the corresponding air inlet channel is swept by anti-blocking ash hot air in the anti-blocking ash air chamber to prevent blocking;
the upper streams of all the ash blocking prevention air chambers are converged in the same ash blocking prevention air chamber, and the ash blocking prevention hot air in the ash blocking prevention air chamber is used for sweeping each air inlet channel to prevent blocking;
each anti-blocking ash air chamber is provided with an anti-blocking hot air adjusting door, and the anti-blocking ash hot air amount and the blowing time in each anti-blocking ash air chamber are independently adjusted and controlled through an actuator;
the partition plates are circumferential partition plates of a circular ring structure, n circumferential partition plates are arranged coaxially, the end face of the cold end is divided into n +1 independent annular air inlet channels, and n is more than or equal to 1 and less than or equal to 5.
2. The method for ring-dividing anti-blocking of the heat storage elements at the cold end of the air preheater as claimed in claim 1, wherein: and a middle radial partition plate connected with the circumferential partition plate is arranged on the end surface of the cold end of the rotor of the annular air inlet channel at least at the outermost ring.
3. The method for ring-dividing anti-blocking of the heat storage elements at the cold end of the air preheater as claimed in claim 2, wherein: each rotor bin lattice corresponds to a middle radial partition plate, and the middle radial partition plates are arranged along the angular bisector of the corresponding rotor bin lattice.
4. The method for ring-dividing anti-blocking of the heat storage elements at the cold end of the air preheater as claimed in claim 2, wherein: the circumferential partition plate is provided with a circumferential sealing sheet, and/or the middle radial partition plate is provided with a middle radial sealing sheet.
5. The method for ring-dividing anti-blocking of the heat storage element at the cold end of the air preheater as claimed in any one of claims 1 to 4, wherein: every annular inlet air channel all is equipped with one rather than the stifled grey plenum of preventing of independent intercommunication, and the upper reaches of all prevent stifled grey plenums all converge in same prevent stifled grey plenum, all are equipped with on every prevent stifled grey plenum and prevent stifled hot-blast regulation door, utilize prevent stifled grey hot-blast wheel of preventing in the stifled grey plenum to sweep each inlet air channel and prevent stifled.
6. The method for ring-dividing anti-blocking of the heat storage element at the cold end of the air preheater as claimed in any one of claims 1 to 4, wherein: arranging at least one ash blockage preventing hot air sampling port at the outlet position of the hot end of each air inlet channel, sampling at the ash blockage preventing hot air sampling ports, measuring the dust concentration q of a sampled product on line, and judging the ash blockage condition of a corresponding heat storage element according to the measured dust concentration q; when the ash blockage preventing hot air quantity introduced into the corresponding air inlet channel is increased, the dust concentration q is reduced, and the ash blockage preventing hot air quantity before the increase is the optimal air quantity in the corresponding air inlet channel.
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