CN113819481A - Anti-blocking rotary air preheater based on circulating temperature rise and blowing of circulating wheel and anti-blocking method - Google Patents
Anti-blocking rotary air preheater based on circulating temperature rise and blowing of circulating wheel and anti-blocking method Download PDFInfo
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- CN113819481A CN113819481A CN202111005642.7A CN202111005642A CN113819481A CN 113819481 A CN113819481 A CN 113819481A CN 202111005642 A CN202111005642 A CN 202111005642A CN 113819481 A CN113819481 A CN 113819481A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000007664 blowing Methods 0.000 title description 17
- 238000009826 distribution Methods 0.000 claims abstract description 33
- 238000010926 purge Methods 0.000 claims abstract description 19
- 238000005192 partition Methods 0.000 claims abstract description 12
- 238000005338 heat storage Methods 0.000 claims description 37
- 239000003546 flue gas Substances 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 15
- 230000001105 regulatory effect Effects 0.000 claims description 15
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 14
- 230000000903 blocking effect Effects 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 5
- 230000008676 import Effects 0.000 claims description 4
- 239000002956 ash Substances 0.000 description 73
- 108091006146 Channels Proteins 0.000 description 27
- 230000000694 effects Effects 0.000 description 10
- 230000002195 synergetic effect Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 239000002253 acid Substances 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 239000000428 dust Substances 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
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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
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G1/00—Non-rotary, e.g. reciprocated, appliances
- F28G1/16—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris
-
- 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
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Supply (AREA)
Abstract
The invention discloses an anti-blocking rotary air preheater based on circulating temperature rise and purging of a circulating wheel and an anti-blocking method, wherein a circumferential partition plate is arranged on the cold end face of a rotor of the air preheater, and the cold end face is divided into N independent annular air inlets; an anti-blocking ash bin is arranged between a primary air bin and a secondary air bin at the cold end of the air preheater, and a hot primary air duct, an anti-blocking ash bin inlet, an anti-blocking ash bin outlet and a secondary air bin outlet are communicated in sequence; the anti-blocking ash duct is divided into N independent anti-blocking ash ducts by a first partition plate, inlets of the N independent anti-blocking ash ducts are respectively provided with an anti-blocking ash duct ring-dividing adjusting door, and outlets of the N independent anti-blocking ash ducts are respectively communicated with the N independent ring-shaped air inlets in sequence; the cold secondary air duct is divided into N independent cold secondary air distribution ducts through a second partition plate, the inlets of the N independent cold secondary air distribution ducts are respectively provided with a cold secondary air distribution ring adjusting door, and the outlets of the N independent cold secondary air distribution ducts are respectively communicated with N independent annular air inlets in sequence. The invention can efficiently solve the problem of ash blockage of the air preheater.
Description
Technical Field
The invention relates to an anti-blocking rotary air preheater based on circulating temperature rise and blowing of a circulating wheel and an anti-blocking method, and belongs to the technical field of anti-blocking ash of air preheaters.
Background
A rotary air preheater (hereinafter, referred to as "air preheater") is a heat exchange device for a large-scale utility boiler, which uses the heat of boiler flue gas to heat air required for combustion, thereby improving the efficiency of the boiler.
The main focus problems of the air preheater include ash blockage, high air leakage rate, low heat transfer efficiency, severe low-temperature corrosion and the like, and the problems affect the safe and economic operation of the air preheater and the whole boiler system for a long time.
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, the problem of ash blockage is particularly prominent, and the control 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 material is in a molten state within the temperature range of 146-207 ℃, and can be firmly adhered to the surface of a heat storage element of the air preheater, so that the heat storage element is corroded and deposited with dust, and finally, the dust is easily blocked, thereby causing great hidden trouble 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 steam is condensed, and sulfuric acid solutionAnd the water 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 concentration of the coal ash is higher than that of the designed coal, and the 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 plurality of power plants, so that the acid dew point of the power plants is higher than the smoke exhaust temperature at present, the low-temperature corrosion (acid dew point corrosion) is aggravated, and the ash blockage problem is quite prominent.
From the above ash blocking mechanism, the ash blocking of the air preheater is closely related to the wall temperature of the heat storage element, and when the wall temperature of the heat storage element rises, the ash blocking process is reversible and controllable. In engineering practice, the air inlet temperature of the air side of the air preheater is increased conventionally, and one specific method is to increase the average air inlet temperature by adding a heat source to increase the exhaust gas temperature, such as a fan heater, a hot air recirculation technology and the like; another specific method is to add a stream of high-temperature air to the cold end of the air side for centralized heating, such as component cutting and anti-blocking technology. The former has limited range of increasing the wall temperature of the heat storage element and can cause great increase of smoke discharge loss; the latter generally because high temperature air heats local heat accumulation element, the heating time is short, and the wall temperature promotes limitedly, prevents stifled effect also unobvious, and if improve the wall temperature by a wide margin, because of whole cold junction terminal surface wall temperature all rises, boiler exhaust gas temperature can rise by a wide margin, leads to boiler efficiency to show the decline.
Disclosure of Invention
The invention provides an anti-blocking type rotary air preheater based on circulation wheel circulation temperature rise and purging and an anti-blocking method, aiming at solving the problems of blocking, corrosion and the like of the rotary air preheater in the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an anti-blocking rotary air preheater based on circulation wheel heating and purging is characterized in that a cold end fan-shaped plate and a hot end fan-shaped plate are matched with two end faces of an air preheater rotor, the air preheater rotor is divided into a flue gas sub-bin, a primary air sub-bin and a secondary air sub-bin, an inlet and an outlet of the flue gas sub-bin are respectively communicated with a high-temperature flue and a low-temperature flue, and the flue gas flows from top to bottom, an inlet and an outlet of the primary air sub-bin are respectively communicated with a cold primary air channel and a hot primary air channel, and primary air flows from bottom to top, and an inlet and an outlet of the secondary air sub-bin are respectively communicated with a cold secondary air channel and a hot secondary air channel, and secondary air flows from bottom to top; a circumferential partition plate is arranged on the cold end face of the air preheater rotor, and the cold end face is divided into N independent annular air inlets;
an anti-blocking ash bin is arranged between a primary air bin and a secondary air bin at the cold end of the air preheater, the inlet of the anti-blocking ash bin is communicated with an anti-blocking ash air duct, the anti-blocking ash air duct is communicated with a hot primary air duct, the outlet of the anti-blocking ash bin is communicated with the outlet of the secondary air bin, the anti-blocking ash air duct is divided into N independent anti-blocking ash air ducts through a first partition plate, N is more than or equal to 2, the outlets of the N independent anti-blocking ash air ducts are respectively communicated with N independent annular air inlets in sequence, and the inlets of the N independent anti-blocking ash air ducts are respectively provided with an anti-blocking ash ring adjusting door;
the cold secondary air duct is divided into N independent cold secondary air distribution ducts through a second partition plate, outlets of the N independent cold secondary air distribution ducts are sequentially communicated with N independent annular air inlets respectively, and inlets of the N independent cold secondary air distribution ducts are provided with cold secondary air distribution ring adjusting doors respectively;
the anti-blocking ash air duct, the cold secondary air distribution duct and the annular air inlet are equal in number and correspond to one another.
The one-to-one correspondence of the anti-blocking ash air duct, the cold secondary air distribution duct and the annular air inlet means that the anti-blocking ash air duct and the cold secondary air distribution duct are in one-to-one correspondence, and the anti-blocking ash air duct and the cold secondary air distribution duct which correspond to each other correspond to the same annular air inlet and are only different in latitude on the same annular air inlet.
The applicant finds that when the opening of a certain cold secondary air distribution ring arranged on the cold secondary air duct is reduced, the flow in the corresponding cold secondary air distribution duct is reduced, at the moment, the cold air entering the heat storage element through the corresponding annular air inlet is reduced, the wall temperature of the whole circulating heat storage element is increased, and the ash blocking substances adhered to the heat storage element are gradually gasified and become loose; high-pressure hot primary air can be synchronously introduced into the anti-blocking ash air channel corresponding to the ring, so that the heat storage elements in the whole ring are heated and blown in a synergic manner, and the effect of removing accumulated ash is obviously improved.
According to the anti-blocking rotary air preheater based on circulation heating and blowing of the circulating wheel, the heating and blowing of a certain heat storage element are mutually promoted through the synergistic effect of the heating and blowing of the heat storage element, and efficient anti-blocking is realized.
One or two secondary air sub-bins are provided, and the other sub-bins are provided. When the overgrate air divides the storehouse to be two, the primary air divides the storehouse to be located between two overgrate air branch storehouses, it divides the storehouse to set up between primary air branch storehouse of air preheater cold junction and one of them overgrate air divides the storehouse and prevents stifled ash, and the cold secondary wind channel that two overgrate air divide the storehouse to correspond all divides N independent cold secondary to divide the wind channel through the second baffle, every overgrate air divides N independent cold secondary that the storehouse corresponds to divide the wind channel outlet to communicate with N independent annular air intake respectively in proper order, every overgrate air divides N independent cold secondary that the storehouse corresponds to divide the wind channel inlet to be equipped with cold secondary air branch ring regulating gate respectively.
The anti-blocking method of the anti-blocking rotary air preheater based on circulation heating and blowing of the circulating wheel comprises the following steps:
1) the opening degree of one cold secondary air ring-dividing adjusting door is reduced (in the same secondary sub-bin, other cold secondary air ring-dividing adjusting doors are in a normal opening state), the cold secondary air flow in the corresponding cold secondary air-dividing duct is reduced, the wall temperature of the whole circulating heat storage element covered by the cold secondary air-dividing duct rises, the ash blocking substances adhered to the wall are gradually gasified, and the deposited ash becomes loose and is further taken out;
2) the opening degree of other cold secondary air circulation regulating doors is reduced in a circulating manner (at the same moment, in the same secondary cabin, the opening degree of only one secondary air circulation regulating door is reduced, and the other secondary air circulation regulating doors are in a normal opening state), so that the heating and anti-blocking of all heat storage elements are realized;
3) opening an anti-blocking ash air distribution ring adjusting door on one anti-blocking ash air duct (other anti-blocking ash air distribution ring adjusting doors are in a closed state) while the step 1) is carried out, and introducing high-pressure hot primary air to realize high-temperature purging on the ring heat storage element;
4) and (3) opening the anti-blocking ash wind separating ring regulating doors on other anti-blocking ash wind channels in a circulating manner (only one anti-blocking ash wind separating ring regulating door on one anti-blocking ash wind channel is opened at the same moment, and the rest anti-blocking ash wind separating ring regulating doors are uniformly in a closed state), so that high-temperature purging of all heat storage elements is realized.
The method has the advantages that the temperature rise and the purging of the heat storage element are mutually promoted through the synergistic effect of the temperature rise and the purging of the heat storage element, so that the efficient blockage prevention is realized; each cycle is carried out circularly, and the high-efficiency anti-blocking of the whole air preheater rotor is realized. The air preheater secondary air inlet flow is reduced to a certain extent in the temperature rising process of a certain ring of heat storage element, and the anti-blocking ash bin outlet is communicated with the secondary air sub-bin outlet, so that the hot secondary air flow is increased to a certain extent in the blowing process, and the hot secondary air flow and the pressure stability are also favorably maintained.
In order to further strengthen the anti-blocking effect, at the same moment, the cold secondary air-distributing channel corresponding to the cold secondary air-distributing ring adjusting door with the opening degree reduced and the anti-blocking ash air channel corresponding to the anti-blocking ash air-distributing ring adjusting door correspond to the same annular air inlet. Therefore, the effect of synergistic temperature rise can be enhanced, and the effects of high-temperature blowing and dust deposition removal are enhanced.
In order to improve the integration level of the system, the ash blocking prevention air distribution ring adjusting door and the cold secondary air distribution ring adjusting door can be of an integrated structure or of a split structure, the specific structure type is not limited in the application, and the air quantity adjusting device can be used as long as the air quantity adjusting device can adjust the air quantity (including the condition of adjusting the air quantity to zero).
In order to reduce the cost and ensure the operation effect and the system safety, N is preferably between 3 and 5, namely N is preferably 3 or 4 or 5.
The invention combines the existing automatic control system and the driving device to realize automatic control.
The prior art is referred to in the art for techniques not mentioned in the present invention.
The anti-blocking rotary air preheater based on circulation-divided wheel circulation temperature rise and blowing realizes efficient anti-blocking of the heat storage elements through the synergistic effect of the wheel circulation on the temperature rise and blowing of the heat storage elements.
Drawings
FIG. 1 is a schematic diagram of the arrangement of an anti-blocking ash air duct at the cold end of the air preheater and a cold secondary air dividing duct.
FIG. 2 is a schematic diagram of a cyclic heating and back-blowing core process of the present invention expressed by a way that an air preheater is expanded along a circumferential direction.
In the figure: 1 is a high-temperature flue, 2 is a low-temperature flue, 3 is a cold primary air duct, 4 is a hot primary air duct, 5 is a cold secondary air duct, 6 is a hot secondary air duct, 7 is an anti-blocking ash air duct, 8 is an anti-blocking ash air ring-separating adjusting door, and 9 is a cold secondary air ring-separating adjusting door; 10 is a smoke branch bin, 11 is a primary air branch bin, 12 is a secondary air branch bin, and 13 is an anti-blocking ash branch bin; a1, B1 and C1 are anti-blocking ash air ducts, and A2, B2 and C2 are cold secondary air distribution ducts.
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, an anti-blocking rotary air preheater based on circulation heating and purging of a circulating wheel, wherein a cold end sector plate and a hot end sector plate are matched with two end surfaces of an air preheater rotor, the air preheater rotor is divided into a flue gas sub-bin, a primary air sub-bin and a secondary air sub-bin, each sub-bin is one, an inlet and an outlet of each flue gas sub-bin are respectively communicated with a high-temperature flue and a low-temperature flue, and the flue gas flows from top to bottom, an inlet and an outlet of each primary air sub-bin are respectively communicated with a cold primary air channel and a hot primary air channel, and primary air flows from bottom to top, an inlet and an outlet of each secondary air sub-bin are respectively communicated with a cold secondary air channel and a hot secondary air channel, and secondary air flows from bottom to top, a circumferential partition plate is arranged on the cold end surface of the air preheater rotor, and the cold end surface is divided into 3 independent annular air inlets;
an anti-blocking ash bin is arranged between a primary air bin and a secondary air bin at the cold end of the air preheater, the inlet of the anti-blocking ash bin is communicated with an anti-blocking ash air duct, the anti-blocking ash air duct is communicated with a hot primary air duct, the outlet of the anti-blocking ash bin is communicated with the outlet of the secondary air bin, the anti-blocking ash air duct is divided into 3 independent anti-blocking ash air ducts through a first partition plate, the outlets of the 3 independent anti-blocking ash air ducts are respectively communicated with 3 independent annular air inlets in sequence, and the inlets of the 3 independent air ducts are respectively provided with an anti-blocking ash ring adjusting door;
the cold secondary air duct is divided into 3 independent cold secondary air distribution ducts by a second partition plate, outlets of the 3 independent cold secondary air distribution ducts are respectively communicated with 3 independent annular air inlets in sequence, and inlets of the 3 independent cold secondary air distribution ducts are respectively provided with a cold secondary air distribution ring adjusting door;
the anti-blocking ash air duct, the cold secondary air distribution duct and the annular air inlet are equal in number and correspond to one another.
The anti-blocking method of the anti-blocking rotary air preheater based on circulation heating and blowing of the circulating wheel comprises the following steps:
1) the opening degree of one cold secondary air ring-dividing adjusting door is reduced (other cold secondary air ring-dividing adjusting doors are in a normal opening state), the cold secondary air flow in the corresponding cold secondary air-dividing duct is reduced, the wall temperature of the whole-ring heat storage element which is circulated and covered by the cold secondary air-dividing duct is increased, and the ash blocking substances adhered to the cold secondary air-dividing duct are gradually gasified and the deposited ash becomes loose and is further taken out;
2) the opening degree of other cold secondary air circulation regulating doors is reduced through circulation, so that the heating and anti-blocking of all heat storage elements are realized;
3) opening an anti-blocking ash air distribution ring adjusting door on one anti-blocking ash air duct (other anti-blocking ash air distribution ring adjusting doors are in a closed state) while the step 1) is carried out, and introducing high-pressure hot primary air to realize high-temperature purging on the ring heat storage element;
4) and opening the anti-blocking ash air ring-separating regulating door on other anti-blocking ash air channels in a circulating manner to realize high-temperature purging of all heat storage elements.
The method has the advantages that the temperature rise and the purging of the heat storage element are mutually promoted through the synergistic effect of the temperature rise and the purging of the heat storage element, so that the efficient blockage prevention is realized; each cycle is carried out circularly, and the high-efficiency anti-blocking of the whole air preheater rotor is realized. The air preheater secondary air inlet flow is reduced to a certain extent in the temperature rising process of a certain ring of heat storage element, and the anti-blocking ash bin outlet is communicated with the secondary air sub-bin outlet, so that the hot secondary air flow is increased to a certain extent in the blowing process, and the hot secondary air flow and the pressure stability are also favorably maintained.
Example 2
On the basis of the embodiment 1, the following improvements are further made: at the same moment, the cold secondary air branch air channel corresponding to the cold secondary air branch ring adjusting door with the opening degree reduced and the anti-blocking ash air channel corresponding to the anti-blocking ash air branch ring adjusting door opened correspond to the same annular air inlet. Therefore, the effect of synergistic temperature rise can be enhanced, and the effects of high-temperature blowing and dust deposition removal are enhanced.
Example 3
On the basis of the embodiment 1 or 2, the following improvements are further made: the overgrate air divides the storehouse to have two, the one time wind divides the storehouse to be located between two overgrate air branch storehouses, divide the storehouse at air preheater cold junction one time wind and set up between the storehouse with one of them overgrate air and prevent stifled ash branch storehouse, and the cold secondary wind channel that two overgrate air branch storehouses correspond all divides 3 independent cold secondary to divide the wind channel through the second baffle, 3 independent cold secondary that every overgrate air branch storehouse corresponds divides the wind channel export to communicate in proper order with 3 independent annular air intake respectively, 3 independent cold secondary that every overgrate air branch storehouse corresponds divides the wind channel import to be equipped with cold secondary air branch ring regulating gate respectively.
The anti-blocking method of the anti-blocking rotary air preheater based on circulation heating and blowing of the circulating wheel comprises the following steps:
1) the opening degree of one cold secondary air ring-dividing adjusting door in one secondary air sub-bin is reduced (in the secondary air sub-bin, other cold secondary air ring-dividing adjusting doors are in a normal opening state), the flow rate of cold secondary air in a corresponding cold secondary air-dividing duct is reduced, the wall temperature of the whole-ring heat storage element which is circulated and covered by the cold secondary air-dividing duct rises, and the ash blocking substances adhered to the cold secondary air-dividing duct are gradually gasified and become loose to be carried out;
2) the opening degree of other cold secondary air circulation regulating doors in the secondary air branch bin is reduced in a circulating manner, so that the heating and anti-blocking of all heat storage elements are realized;
3) meanwhile, according to the method of the steps 1) -2), the opening degree of a cold secondary air split-ring adjusting door in the other secondary air split bin is controlled in a round-robin manner;
4) opening an anti-blocking ash air distribution ring adjusting door on one anti-blocking ash air duct (other anti-blocking ash air distribution ring adjusting doors are in a closed state) while the step 1) is carried out, and introducing high-pressure hot primary air to realize high-temperature purging on the ring heat storage element;
5) and opening the anti-blocking ash air ring-separating regulating door on other anti-blocking ash air channels in a circulating manner to realize high-temperature purging of all heat storage elements.
Example 4
On the basis of the embodiment 3, the following improvements are further made: at the same moment, the opening degree of the cold secondary air separating ring adjusting door on the cold secondary air separating channel on the two secondary air bins corresponding to the same annular air inlet is reduced at the same time, and the anti-blocking ash air separating ring adjusting door on the anti-blocking ash air channel corresponding to the annular air inlet is opened. Therefore, the effect of synergistic temperature rise can be enhanced, and the effects of high-temperature blowing and dust deposition removal are enhanced.
Claims (5)
1. The utility model provides an prevent stifled type rotation air preheater based on divide circulating wheel circulation intensification and sweep, through cold, hot junction sector plate and the cooperation of air preheater rotor both ends face, divide the air preheater rotor into the flue gas branch storehouse, primary air divides storehouse and overgrate air branch storehouse, the import and the export of flue gas branch storehouse communicate high temperature flue and low temperature flue respectively, and flue gas top-down flows, the import and the export of primary air branch storehouse communicate cold primary air duct and hot primary air duct respectively, and primary air flows from bottom to top, the import and the export of overgrate air branch storehouse communicate cold secondary air duct and hot secondary air duct respectively, and overgrate air flows from bottom to top, its characterized in that: a circumferential partition plate is arranged on the cold end face of the air preheater rotor, and the cold end face is divided into N independent annular air inlets;
an anti-blocking ash bin is arranged between a primary air bin and a secondary air bin at the cold end of the air preheater, the inlet of the anti-blocking ash bin is communicated with an anti-blocking ash air duct, the anti-blocking ash air duct is communicated with a hot primary air duct, the outlet of the anti-blocking ash bin is communicated with the outlet of the secondary air bin, the anti-blocking ash air duct is divided into N independent anti-blocking ash air ducts through a first partition plate, N is more than or equal to 2, the outlets of the N independent anti-blocking ash air ducts are respectively communicated with N independent annular air inlets in sequence, and the inlets of the N independent anti-blocking ash air ducts are respectively provided with an anti-blocking ash ring adjusting door;
the cold secondary air duct is divided into N independent cold secondary air distribution ducts through a second partition plate, outlets of the N independent cold secondary air distribution ducts are sequentially communicated with N independent annular air inlets respectively, and inlets of the N independent cold secondary air distribution ducts are provided with cold secondary air distribution ring adjusting doors respectively;
the anti-blocking ash air duct, the cold secondary air distribution duct and the annular air inlet are equal in number and correspond to one another.
2. The anti-blocking rotary air preheater based on circulation wheel cycle temperature rise and purging as claimed in claim 1, wherein: n is between 3 and 5.
3. The anti-blocking rotary air preheater based on circulation wheel cycle temperature rise and purging as claimed in claim 1 or 2, wherein: when the overgrate air divides the storehouse to be two, the primary air divides the storehouse to be located between two overgrate air branch storehouses, it divides the storehouse to set up between primary air branch storehouse of air preheater cold junction and one of them overgrate air divides the storehouse and prevents stifled ash, and the cold secondary wind channel that two overgrate air divide the storehouse to correspond all divides N independent cold secondary to divide the wind channel through the second baffle, every overgrate air divides N independent cold secondary that the storehouse corresponds to divide the wind channel outlet to communicate with N independent annular air intake respectively in proper order, every overgrate air divides N independent cold secondary that the storehouse corresponds to divide the wind channel inlet to be equipped with cold secondary air branch ring regulating gate respectively.
4. An anti-blocking method for a rotary air preheater, which utilizes the anti-blocking rotary air preheater based on circulation wheel circulation temperature rise and purging as claimed in any one of claims 1 to 3, and is characterized in that: the method comprises the following steps:
1) the opening degree of one cold secondary air ring-dividing adjusting door is reduced, the flow rate of cold secondary air in the corresponding cold secondary air-dividing channel is reduced, the cold secondary air-dividing channel covers the wall temperature of the circulating whole-ring heat storage element to rise, and the ash blocking substances adhered to the cold secondary air-dividing channel are gradually gasified, the deposited ash becomes loose and then are taken out;
2) the opening degree of other cold secondary air circulation regulating doors is reduced through circulation, so that the heating and anti-blocking of all heat storage elements are realized;
3) opening an anti-blocking ash air ring separating adjusting door on one anti-blocking ash air duct while the step 1) is carried out, and introducing high-pressure hot primary air to realize high-temperature purging on the ring heat storage element;
4) and opening the anti-blocking ash air ring-separating regulating door on other anti-blocking ash air channels in a circulating manner to realize high-temperature purging of all heat storage elements.
5. The anti-blocking method for the rotary air preheater as claimed in claim 4, wherein: at the same moment, the cold secondary air branch air channel corresponding to the cold secondary air branch ring adjusting door with the opening degree reduced and the anti-blocking ash air channel corresponding to the anti-blocking ash air branch ring adjusting door opened correspond to the same annular air inlet.
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| CN202111005642.7A CN113819481A (en) | 2021-08-30 | 2021-08-30 | Anti-blocking rotary air preheater based on circulating temperature rise and blowing of circulating wheel and anti-blocking method |
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| CN202111005642.7A CN113819481A (en) | 2021-08-30 | 2021-08-30 | Anti-blocking rotary air preheater based on circulating temperature rise and blowing of circulating wheel and anti-blocking method |
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| CN209524535U (en) * | 2018-11-20 | 2019-10-22 | 南京博沃科技发展有限公司 | A kind of air preheater hot wind anti-blocking system based on air-cooler pressurization |
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