CN107191963B - Rotary air preheater and method for preventing ammonium bisulfate from being blocked by rotary air preheater - Google Patents
Rotary air preheater and method for preventing ammonium bisulfate from being blocked by rotary air preheater Download PDFInfo
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- CN107191963B CN107191963B CN201710557438.3A CN201710557438A CN107191963B CN 107191963 B CN107191963 B CN 107191963B CN 201710557438 A CN201710557438 A CN 201710557438A CN 107191963 B CN107191963 B CN 107191963B
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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
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
- F23J3/02—Cleaning furnace tubes; Cleaning flues or chimneys
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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
- F23L2900/00—Special arrangements for supplying or treating air or oxidant for combustion; Injecting inert gas, water or steam into the combustion chamber
- F23L2900/15043—Preheating combustion air by heat recovery means located in the chimney, e.g. for home heating devices
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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
Abstract
The invention discloses a rotary air preheater, which comprises an air preheater body and an air preheater rotor, wherein a smoke side and an air side are arranged in the air preheater body and are separated by a sector plate to form independent circulation channels of the smoke side and the air side; the air side comprises a first air side and a second air side, the air pre-heater rotor is arranged in the air pre-heater body, a heat exchange element is arranged on the air pre-heater rotor, and the air pre-heater rotor further comprises a high-temperature fan connected with a flue gas side inlet or an air side outlet of the air pre-heater through a pipeline, a flue gas injection device arranged at the cold end of the air pre-heater and connected with the high-temperature fan through a pipeline, and a steam soot blower; the invention controls the metal wall temperature of the cold end of the air preheater by effectively utilizing the heat of high-temperature flue gas/hot air, limits the ammonium bisulfate deposition zone to the lower part of the cold end of the air preheater, and then purges the ammonium bisulfate deposition zone by utilizing a soot blower; the method has the advantages of effectively relieving the blockage of the air preheater on line, reducing the unplanned shutdown times of the air preheater, and improving the reliability and economy of the boiler unit.
Description
Technical Field
The invention belongs to the technical field of auxiliary equipment of boilers of thermal power plants, and particularly relates to a rotary air preheater capable of preventing ammonium bisulfate from being blocked.
Background
According to the standard requirements of GB13223-2011 emission Standard for atmospheric pollutants of thermal Power plant, 100mg/Nm of nitrogen oxide emissions of a thermal Power coal-fired boiler was executed since 2014 3 With ultra-clean emissions modification of various power plants in recent years, the emissions limit is 50mg/Nm 3 . In order to meet the requirements, except a few circulating fluidized bed coal-fired units, a selective catalytic reduction (selective catalytic reduction) denitration device is basically additionally arranged at the outlet of a boiler economizer of the domestic coal-fired unit, nitrogen oxides are reduced into nitrogen and water under the action of a catalyst, and meanwhile, a small amount of sulfur dioxide is catalyzed and oxidized into sulfur trioxide to produce chemical side reactions, and the sulfur trioxide reacts with ammonia escaped from denitration in a proper temperature window to produce ammonium bisulfate and ammonium sulfate, wherein the main side reactions are as follows:
SO 2 +1/2O 2 →SO 3
NH 3 +SO 3 +H 2 O→NH 4 HSO 4
2NH 3 +SO 3 +H 2 O→(NH 4 ) 2 SO 4
ammonium sulfate is a dry powder, and ammonium bisulfate is a highly viscous liquid substance in the temperature range of 150-220 ℃ and gradually turns into a gaseous substance in the temperature range of more than 220 ℃.
The rotary air preheater (air preheater for short) is used as heat exchange rotating equipment in the coal-fired/oil unit, the heat exchange element of the air preheater absorbs the heat of high-temperature flue gas at the outlet of the denitration device and heats the low-temperature air entering the hearth, the rotary air preheater is arranged at the flue outlet of the denitration device, the flue gas temperature field is 110-420 ℃, and the metal wall temperature field of the heat exchange element is generally 80-380 ℃. When NH in flue gas 3 The concentration is far higher than SO 3 When the concentration is reached, the reaction mainly generates dry powdery ammonium sulfate, and can not generate adhesion scaling on the subsequent equipment (such as the cold end of the air preheater) of the denitration device. When SO in flue gas 3 Concentration is higher than fugitive NH 3 At concentration, ammonium bisulfate is mainly produced. Due to the requirement ofThe ammonia escape from the denitration outlet is generally not more than 3 mu L/L, SO that the ammonia concentration in the flue gas cannot be far higher than SO 3 Therefore, ammonium bisulfate is more easily generated in the air preheater. When the liquid phase temperature interval of the ammonium bisulfate is overlapped with the metal wall temperature of the heat exchange element of the rotary air preheater, the ammonium bisulfate is easy to condense and deposit on the surface of the heat exchange element of the air preheater and adhere to fly ash particles in flue gas to block channels of the heat exchange element. When the rotary air preheater is seriously blocked, the output of the fan is increased if the rotary air preheater is light, the power of the plant is increased, and the output of the fan is insufficient if the rotary air preheater is heavy, so that the boiler cannot run at full load and is forced to be shut down for cleaning. For the unit with serious blockage, if related measures are not taken, the air preheater is shut down and cleaned once in 1-3 months, so that the boiler grate production plan is directly affected, and huge economic loss is caused. Therefore, how to prevent the air preheater from being blocked by ammonium bisulfate on line is a technical problem to be solved at present.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problem that the air preheater is easy to be blocked by ammonium bisulfate in the prior art, the rotary air preheater and the ammonium bisulfate blocking prevention method thereof are provided, which can effectively relieve the blocking of the air preheater and reduce the unplanned shutdown times of the air preheater on line under the full-load working condition.
The technical scheme adopted for solving the technical problems is as follows: the rotary air preheater comprises an air preheater body and an air preheater rotor, wherein a smoke side and an air side are arranged in the air preheater body and are separated by a sector plate to form independent circulation channels of the smoke side and the air side; the air side comprises a first air side and a second air side, the air pre-heater rotor is arranged in the air pre-heater body, a heat exchange element is arranged on the air pre-heater rotor, and the air pre-heater further comprises a high-temperature fan connected with a flue gas side inlet/air side outlet of the air pre-heater through a pipeline, a flue gas injection device arranged at the cold end of the air pre-heater and connected with the high-temperature fan through a pipeline, and a steam soot blower arranged at the cold end of the air pre-heater.
Preferably, the air preheater rotor turns to a first flue gas side to a second flue gas side from a first wind side to a second wind side, and the high-temperature fan is connected with a first flue gas side inlet or a first wind side outlet through a pipeline.
Preferably, the flue gas injection device is arranged at the position of the sector plate close to the second wind side, the installation position and the sector plate form an angle theta, and the theta is more than or equal to 0 ℃ and less than or equal to 20 ℃.
Preferably, the flue gas injection device and the high-temperature fan inlet pipeline are respectively provided with a flow regulating device.
The method for preventing the ammonium bisulfate from being blocked by the rotary air preheater comprises the following steps:
(a) The air preheater rotor turns to a flue gas side to a wind side I to a wind side II to a flue gas side, heat in the flue gas passes through a heat exchange element on the heating air preheater rotor, and the heat exchange element heats air after the rotor rotates to an air side;
(b) High-temperature gas is led out from a flue gas side inlet/an air side outlet of the air preheater through a pipeline, and is pressurized by a high-temperature fan and then sent to a flue gas injection device;
(c) The pressurized high-temperature gas is blown to the cold end of the air preheater through a smoke injection device, so that the metal wall temperature of the cold end heat exchange element is increased;
(d) And (3) adopting a steam soot blower to perform steam soot blowing on the cold end of the air preheater, and blowing away ammonium bisulfate and fly ash adhered to the ammonium bisulfate.
Preferably, the high temperature gas in the step (b) is pressurized to 3-10KPa by a high temperature fan.
Preferably, the high temperature gas in the step (b) is high temperature flue gas led from a flue gas side inlet or high temperature air led from a wind side outlet.
Preferably, step (c) is characterized by controlling the temperature of the upper metal wall of the cold-end heat exchange element to be 220-280 ℃.
Preferably, the cold end of the air preheater in the step (c) is purged by a flue gas injection device, and then the comprehensive temperature of the cold end of the air preheater is controlled to be 140-200 ℃.
The beneficial effects of the invention are as follows: the rotary air preheater disclosed by the invention has the advantages that under the online full-load working condition and under the condition of no shutdown, the temperature interval is reasonably controlled, the heat of high-temperature flue gas/high-temperature air is effectively utilized, the metal wall temperature of the cold-end heat exchange element of the air preheater is controlled, the ammonium bisulfate deposition zone is limited at the lower part of the cold-end heat exchange element of the air preheater, the ammonium bisulfate deposition zone is controlled to be only in a single layer, the cross-layer accumulation is avoided, and the air preheater is effectively purged through the steam soot blower; the method has the advantages of effectively relieving the blockage of the air preheater on line, reducing the unplanned shutdown times of the air preheater, reducing the related cost of the boiler caused by the unplanned shutdown, and improving the reliability and the economy of the boiler unit.
Drawings
FIG. 1 is a schematic illustration of an ammonium bisulfate deposition zone on a heat exchange element of a prior art hollow pre-heater;
FIG. 2 is a schematic diagram of the operation of the air preheater;
FIG. 3 is a schematic illustration of the deposition of ammonium bisulfate on a cold-end heat exchange element;
FIG. 4 is a schematic illustration of an ammonium bisulfate deposition zone on a heat exchange element of a hollow pre-heater of the present invention;
FIG. 5 is a schematic diagram of an apparatus of the air preheater of the present invention;
FIG. 6 is a schematic view of the installation of the flue gas injection apparatus of the present invention;
marked in the figure as: the installation positions of the 1-ammonium bisulfate deposition belt, the 2-smoke side, the 21-smoke side inlet, the 22-smoke side outlet, the 3-air side, the 31-air side inlet, the 32-air side outlet, the 33-wind side I, the 34-wind side II, the 4-sector plate, the 5-high temperature fan, the 6-smoke injection device, the 7-flow regulating device, the 8-air preheater body, the 9-steam soot blower and the theta-smoke injection device form angles with the sector plate.
Detailed Description
The invention will be further described with reference to the drawings and examples.
The invention relates to a rotary air preheater which comprises an air preheater body 8 and an air preheater rotor, wherein a smoke side 2 and an air side 3 are arranged in the air preheater body 8, and the smoke side 2 and the air side 3 are separated by a sector plate 4 to form independent circulation channels of the smoke side 2 and the air side 3; the air side 3 comprises a first air side 33 and a second air side 34, the air pre-heater rotor is arranged in the air pre-heater body 8, a heat exchange element is arranged on the air pre-heater rotor, the air pre-heater further comprises a high-temperature fan 5 connected with a flue gas side inlet or an air side outlet of the air pre-heater through a pipeline, a flue gas injection device 6 arranged at the cold end of the air pre-heater and connected with the high-temperature fan 5 through a pipeline, and a steam soot blower 9 arranged at the cold end of the air pre-heater. The air preheater is divided into a cold end and a hot end according to the temperature of the heat exchange area, the hot end is positioned at the upper part and is an inlet of high-temperature flue gas and an outlet of high-temperature air, and the cold end is positioned at the lower part and is an outlet of low-temperature flue gas and an inlet of low-temperature air.
The air preheater rotor is turned to be from a smoke side 2 to a wind side one 33 to a wind side two 34 to the smoke side 2, and the high-temperature fan 5 is connected with a smoke side inlet 31 or a wind side one 33 outlet through a pipeline. The flue gas injection device 6 is arranged at the position of the sector plate 4 close to the wind side II 34, the installation position forms an angle theta with the sector plate 4, and the theta is more than or equal to 0 ℃ and less than or equal to 20 ℃.
As shown in fig. 1, 2, 3, 4, 5 and 6, the ammonium bisulfate deposition zone 1 is generally in the middle-upper region of the cold-end heat exchange element of the air preheater. The temperature interval of the cold-end heat exchange element is 75-240 ℃ under high load (boiler load BMCR working condition), the temperature interval of the hot-end heat exchange element is 240-370 ℃, the temperature interval of the cold-end heat exchange element is 65-200 ℃ under low load (boiler load 40% THA working condition), and the temperature interval of the hot-end heat exchange element is 200-320 ℃. As the exhaust temperature of the air preheater is lower, the inlet air temperature is lower, the ammonium bisulfate deposition belt 1 of the air preheater moves upwards to reach the lower region of the hot end heat exchange element, and the air preheater is provided with the cold/hot end steam soot blower 9, but the soot blowing effect is extremely poor at the junction region of the cold end and the hot end, and the blockage of the air preheater is not easy to remove, so that the resistance is increased. The high-temperature fan 5 is connected with the smoke side inlet 21 or the wind side one 33 outlet, the heat exchange element of the air preheater absorbs the heat of the high-temperature smoke side, the heat exchange element is heated and then rotates to the air side to heat the entered low-temperature air, meanwhile, the metal heat exchange element is cooled, the reciprocating circulation is realized, the effective utilization of the heat is realized, and the smoke side 2 and the air side 3 are separated by the sector plate 4 and other parts to form independent circulation channels of the smoke side 2 and the air side 3. The temperature of the metal wall temperature of the cold end heat exchange element is related to the rotation direction, namely, when the heat exchange element just rotates from the air side 3 to the flue gas side 2 after heat transfer, the metal wall temperature of the position point is the lowest, so that the ammonium bisulfate deposition zone 1 is closest to the hot end heat exchange element at the position point. Therefore, high-temperature gas at the outlet of the flue gas side inlet 21 or the air side one 33 is introduced into the flue gas injection device 6 to increase the metal wall temperature of the position point, and the metal wall temperature at the upper part of the cold-end heat exchange element is controlled to be 220-280 ℃, or the cold-end comprehensive temperature of the air preheater is controlled to be 140-200 ℃; as shown in fig. 4, the ammonium bisulfate deposition belt 1 can be controlled to move towards the bottom of the cold-end heat exchange element of the air preheater so as to remove ammonium bisulfate by soot blowing. The installation angle theta of the flue gas injection device 6 is more than or equal to 0 and less than or equal to 20, the metal wall temperature of the heat exchange element at the right cold end in the section area is the lowest, the temperature difference between the injected high-temperature flue gas/air and the metal wall temperature of the heat exchange element is the highest, the heat transfer effect is good, and the heat transfer effect at the angle of more than 20 ℃ is reduced.
The flue gas injection device 6 and the inlet pipeline of the high temperature fan 5 are respectively provided with a flow regulating device 7. The air preheater is intelligent closed-loop control during operation, and according to the actual cold end comprehensive temperature or the cold end heat exchange element metal wall temperature of the rotary air preheater, the cold end heat exchange element metal wall temperature is compared with a set value, and through logic operation calculation, the high-temperature flue gas or the high-temperature air flow is automatically regulated, and the cold end heat exchange element metal wall temperature is improved. Wherein the cold end comprehensive temperature is the added value of the smoke exhaust temperature and the air inlet temperature.
The method for preventing the ammonium bisulfate from being blocked by the rotary air preheater comprises the following steps:
(a) The air preheater rotor turns to a flue gas side to a wind side I to a wind side II to a flue gas side, heat in the flue gas passes through a heat exchange element on the heating air preheater rotor, and the heat exchange element heats air after the rotor rotates to an air side;
(b) High-temperature smoke led out from a smoke side inlet 21 or high-temperature air led out from a wind side outlet through a pipeline is boosted to 3-10KPa by a high-temperature fan and then sent to a smoke injection device;
(c) The pressurized high-temperature flue gas or high-temperature air is blown to the cold end of the air preheater through a flue gas injection device, so that the metal wall temperature of the cold end heat exchange element is increased; controlling the temperature of the metal wall at the upper part of the cold-end heat exchange element to be 220-280 ℃ or controlling the comprehensive temperature of the cold end of the air preheater to be 140-200 ℃;
(d) And (3) adopting a steam soot blower to perform steam soot blowing on the cold end of the air preheater, and blowing away ammonium bisulfate and fly ash adhered to the ammonium bisulfate.
After the invention is adopted, the metal wall temperature of the heat exchange element at the upper part of the cold end (near the hot end) is controlled to be 220-280 ℃, which is favorable for controlling the ammonium bisulfate deposition zone to be only in a single layer, does not generate cross-layer accumulation and effectively sweeps through soot blowing. Too high a temperature will make the ammonium bisulfate deposition zone easier to clean, but will consume too much heat source to save energy. Ammonium bisulfate can accumulate in a cross-layer manner at too low a temperature, so that the air preheater is easy to block and cannot achieve the expected effect.
Examples:
the rotary air preheater comprises an air preheater body 8 and an air preheater rotor, wherein a smoke side 2 and an air side 3 are arranged in the air preheater body 8, and the smoke side 2 and the air side 3 are separated by a sector plate 4 to form independent circulation channels of the smoke side 2 and the air side 3; the air side 3 comprises a first air side 33 and a second air side 34, the air pre-conditioner rotor is arranged in the air pre-conditioner body 8, a heat exchange element is arranged on the air pre-conditioner rotor, the air pre-conditioner rotor further comprises a high-temperature fan 5 connected with a flue gas side inlet 21 or a first air side outlet through a pipeline, a flue gas injection device 6 arranged at the cold end of the air pre-conditioner and connected with the high-temperature fan 5 through a pipeline, and a steam soot blower 9 arranged at the cold end of the air pre-conditioner, the flue gas injection device is arranged at a sector plate close to the second air side, the installation position and the sector plate form an angle theta, and the theta is more than or equal to 0 ℃ and less than or equal to 20 ℃. The air preheater rotor turns from flue gas side 2 to wind side one 33 to wind side two 34 to flue gas side 2. The flue gas injection device 6 and the inlet pipeline of the high temperature fan 5 are respectively provided with a flow regulating device 7.
The method for preventing the blocking of ammonium bisulfate of the rotary air preheater is as shown in fig. 6, the rotor of the air preheater is turned to a flue gas side 2 to a wind side one 33 to a wind side two 34 to a flue gas side 2, and the heat in the flue gas heats the air through a heat exchange element on the rotor of the air preheater; as shown in fig. 5, the high-temperature flue gas led out from the inlet of the flue gas side 2 is pressurized to 3-10KPa by the high-temperature fan 5 and then sent to the flue gas injection device 6 to purge and heat the cold end of the air preheater, so that the metal wall temperature of the cold end heat exchange element is increased; and adopting a steam soot blower 9 to perform steam soot blowing on the cold end of the air preheater, and purging the ammonium bisulfate and the fly ash adhered to the ammonium bisulfate.
When the air preheater is in normal operation, when the comprehensive temperature of the cold end of the air preheater is lower than a set value of 145 ℃, a high-temperature fan 5 is started to pump high-temperature smoke with the temperature of more than 300 ℃ from a smoke side inlet, the high-temperature smoke is pressurized and then sent to a smoke injection device 6, a cold end heat exchange element of the air preheater is heated, the lowest metal wall temperature of the cold end heat exchange element of the air preheater is lifted, an ammonium bisulfate deposition zone 1 is only arranged at the middle lower part of the cold end element of the air preheater, and ammonium bisulfate is purged through a steam soot blower 9, so that the air preheater is effectively relieved on line. And setting a cold end comprehensive temperature set value, automatically adjusting a flow adjusting device 7 through an intelligent controller according to the actual value of the cold end comprehensive temperature, and controlling the flow of high-temperature flue gas through the flow adjusting device 7 to realize the adjustment of the cold end comprehensive temperature of the air preheater to 145 ℃, so that the ammonium bisulfate deposition zone 1 is ensured to be only arranged at the middle lower part of the cold end element of the air preheater. And in combination with the steam soot blower 9 arranged at the cold end of the air preheater, the cold end of the air preheater is subjected to steam soot blowing periodically, and ammonium bisulfate and fly ash adhered to the ammonium bisulfate are purged, so that the resistance of the air preheater is reduced, and the blocking period of the air preheater is prolonged.
Claims (3)
1. The method for preventing the blocking of ammonium bisulfate by the rotary air preheater is characterized by providing a rotary air preheater which comprises an air preheater body and an air preheater rotor, wherein a flue gas side and an air side are arranged in the air preheater body and are separated by a sector plate to form independent circulation channels of the flue gas side and the air side; the air side comprises a first air side and a second air side, the air pre-heater rotor is arranged in the air pre-heater body, a heat exchange element is arranged on the air pre-heater rotor, the air pre-heater rotor further comprises a high-temperature fan connected with a smoke side inlet/air side outlet of the air pre-heater through a pipeline, a smoke injection device arranged at the cold end of the air pre-heater and connected with the high-temperature fan through a pipeline, and a steam soot blower arranged at the cold end of the air pre-heater, the air pre-heater rotor turns to a smoke side to a first air side to a second air side to a smoke side, and the high-temperature fan is connected with the smoke side inlet or the first air side outlet through a pipeline; the flue gas injection device is arranged at the position of the sector plate close to the wind side II, the installation position forms an angle theta with the sector plate, and the theta is more than or equal to 0 ℃ and less than or equal to 20 ℃; the flue gas injection device and the high-temperature fan inlet pipeline are respectively provided with a flow regulating device;
the method comprises the following steps:
(a) The air preheater rotor turns to a flue gas side to a wind side I to a wind side II to a flue gas side, heat in the flue gas passes through a heat exchange element on the heating air preheater rotor, and the heat exchange element heats air after the rotor rotates to an air side;
(b) High-temperature gas is led out from a flue gas side inlet/an air side outlet of the air preheater through a pipeline, and is pressurized by a high-temperature fan and then sent to a flue gas injection device;
(c) The pressurized high-temperature gas is blown to the cold end of the air preheater through a smoke injection device, the metal wall temperature of the heat exchange element at the cold end is improved, the metal wall temperature at the upper part of the heat exchange element at the cold end is controlled to be 220-280 ℃, and the comprehensive temperature of the cold end of the air preheater is controlled to be 140-200 ℃ after the cold end of the air preheater is blown by the smoke injection device;
(d) And (3) adopting a steam soot blower to perform steam soot blowing on the cold end of the air preheater, and blowing away ammonium bisulfate and fly ash adhered to the ammonium bisulfate.
2. The method for preventing ammonium bisulfate blockage in a rotary air preheater as recited in claim 1, wherein said high temperature gas in step (b) is pressurized to 3-10KPa by a high temperature fan.
3. A method for preventing ammonium bisulfate blockage in a rotary air preheater as recited in claim 1 or 2, wherein said high temperature gas in step (b) is high temperature flue gas introduced from a flue gas side inlet or high temperature air introduced from a wind side outlet.
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| CN201710557438.3A CN107191963B (en) | 2017-07-10 | 2017-07-10 | Rotary air preheater and method for preventing ammonium bisulfate from being blocked by rotary air preheater |
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| CN201710557438.3A CN107191963B (en) | 2017-07-10 | 2017-07-10 | Rotary air preheater and method for preventing ammonium bisulfate from being blocked by rotary air preheater |
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| CN107191963B true CN107191963B (en) | 2023-07-25 |
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