CN110118361B - Working method of five-bin rotary air preheater for preventing ammonium bisulfate deposition - Google Patents
Working method of five-bin rotary air preheater for preventing ammonium bisulfate deposition Download PDFInfo
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- CN110118361B CN110118361B CN201910303698.7A CN201910303698A CN110118361B CN 110118361 B CN110118361 B CN 110118361B CN 201910303698 A CN201910303698 A CN 201910303698A CN 110118361 B CN110118361 B CN 110118361B
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- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 230000008021 deposition Effects 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 title claims abstract description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000003546 flue gas Substances 0.000 claims abstract description 46
- 239000004071 soot Substances 0.000 claims abstract description 23
- 238000002347 injection Methods 0.000 claims description 33
- 239000007924 injection Substances 0.000 claims description 33
- 239000007789 gas Substances 0.000 claims description 30
- 239000000779 smoke Substances 0.000 claims description 28
- 238000007664 blowing Methods 0.000 claims description 13
- 239000010881 fly ash Substances 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 6
- 239000002956 ash Substances 0.000 claims description 3
- 238000010926 purge Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims 1
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 10
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 7
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 229910021529 ammonia Inorganic materials 0.000 description 3
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 3
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 3
- 235000011130 ammonium sulphate Nutrition 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- 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
- F23L15/04—Arrangements of recuperators
-
- 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
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Air Supply (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention relates to a five-bin rotary air preheater for preventing ammonium bisulfate deposition and a working method thereof, belongs to the technical field of auxiliary equipment of boilers in thermal power plants, and aims to solve the technical problem that the existing air preheater is easy to be blocked by ammonium bisulfate. In the invention, an air preheater rotor is arranged in the air preheater, and a heat exchange element is arranged on the air preheater rotor; the air preheater comprises a flue gas side and an air side, wherein the air side comprises a wind side I, a wind side II, a wind side III and a wind side IV; the inlet of the first wind side is connected with the flue gas side inlet through a pipeline, and a first high-temperature fan is arranged between the inlet of the first wind side and the flue gas side inlet; the outlet of the fourth wind side is connected with the inlet of the fourth wind side through a pipeline, and a second high-temperature fan is arranged between the outlet of the fourth wind side and the inlet of the fourth wind side; the cold end of the second wind side is provided with a steam soot blower, and the cold end of the third wind side is provided with an acoustic wave soot blower. The invention can effectively relieve the blockage of the air preheater on line and reduce the unplanned shutdown times of the air preheater under the full-load working condition.
Description
Technical Field
The invention belongs to the technical field of auxiliary equipment of boilers in thermal power plants, and particularly relates to a five-bin rotary air preheater for preventing ammonium bisulfate deposition.
Background
According to the standard requirement of GB13223-2011 'emission Standard of atmospheric pollutants of thermal Power plant', from 2014, the emission limit of 100mg/m 3 of nitrogen oxides of the thermal power generation coal-fired boiler is implemented, and along with ultra-clean emission modification, the emission limit is 50mg/m 3. In order to meet emission requirements, most domestic coal-fired units except a few circulating fluidized bed coal-fired units are additionally provided with a selective catalytic reduction denitration device at the outlet of a boiler economizer, under the action of a catalyst, partial sulfur dioxide (0-3%) is catalyzed and oxidized into sulfur trioxide at the same time when nitrogen oxides are reduced into nitrogen and water by ammonia, and the sulfur trioxide generated by coal firing and the sulfur trioxide generated by catalytic oxidation react with ammonia which is not reacted by denitration under a proper temperature window to generate ammonium bisulfate and ammonium sulfate, wherein the reaction is as follows:
2SO2+O2→2SO3
NH3+SO3+H2O→HN4HSO4
2NH3+SO3+H2O→(HN4)2SO4
Ammonium sulfate is colorless crystal or white granule, and is decomposed above 280 deg.C, and its melting point is 147 deg.C, and its liquid state has high viscosity.
The rotary air preheater is called an air preheater for short as heat exchange rotating equipment in a coal/oil unit, such as China patent with the application number 201710557438.3, a heat exchange element of the air preheater absorbs and stores heat of high-temperature flue gas at the outlet of a denitration device, low-temperature air entering a coal mill and a hearth is heated through rotating heat transfer, 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 70-380 ℃. When the concentration of NH 3 in the flue gas is far higher than the concentration of SO 3, the reaction between the two mainly generates ammonium sulfate powder, the adhesiveness is low, and the adhesion scaling can not be generated on the follow-up equipment of the denitration device, such as the cold end of an air preheater. When the concentration of SO 3 in the flue gas is higher than the concentration of NH 3, ammonium bisulfate is mainly generated. Since the ammonia slip at the denitration outlet is required to be generally not more than 3 mu L/L, SO 3 in the flue gas is far higher than NH 3, and ammonium bisulfate is easier to generate 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 the 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 boiler cannot run at full load due to insufficient output of the fan if the rotary air preheater is heavy, so that the negative pressure fluctuation of the hearth is large, and the boiler is forced to stop for cleaning. For a unit with serious blockage, if no reasonable measures are taken, the air preheater needs to be shut down and cleaned once within 1-3 months, so that the boiler grate production plan is directly influenced, 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 invention aims at solving the technical problem that the existing air preheater is easy to be blocked by ammonium bisulfate, and provides a five-bin rotary air preheater capable of effectively relieving the blocking of the air preheater on line and reducing the non-planned shutdown times of the air preheater under the full-load working condition and a working method thereof.
The invention solves the problems by adopting the following technical scheme: the five-bin rotary air preheater for preventing ammonium bisulfate deposition comprises an air preheater, wherein an air preheater rotor is arranged in the air preheater, and a heat exchange element is arranged on the air preheater rotor; the air preheater is characterized by comprising a flue gas side and an air side, wherein the air side comprises a wind side I, a wind side II, a wind side III and a wind side IV; the inlet of the first wind side is connected with the flue gas side inlet through a pipeline, and a first high-temperature fan is arranged on the pipeline between the inlet of the first wind side and the flue gas side inlet; the outlet of the fourth wind side is connected with the inlet of the fourth wind side through a pipeline, and a second high-temperature fan is arranged on the pipeline between the outlet of the fourth wind side and the inlet of the fourth wind side; the cold end of the second wind side is provided with a steam soot blower, and the cold end of the third wind side is provided with an acoustic wave soot blower.
Preferably, a first flue gas injection device is arranged on a pipeline between the inlet of the flue gas side and the first high-temperature fan, and a second flue gas injection device is arranged on a pipeline between the inlet of the fourth wind side and the second high-temperature fan.
Preferably, the first flue gas injection device is arranged on the flue gas inlet flue, and flow adjusting devices are respectively arranged on inlet pipelines of the first flue gas injection device and the first high-temperature fan; the second flue gas injection device is arranged on an inlet flue of the fourth wind side, and flow adjusting devices are respectively arranged on inlet pipelines of the second flue gas injection device and the second high-temperature fan.
The working method of the five-bin rotary air preheater for preventing ammonium bisulfate deposition is characterized by comprising the following steps of:
a. The turning direction of the air preheater rotor is sequentially a smoke side, a wind side I, a wind side II, a wind side III, a wind side IV and a smoke side, heat in the smoke heats a heat exchange element on the air preheater rotor, and after the rotor rotates to the air side, the heat exchange element heats air;
b. leading out high-temperature gas from an inlet of the wind side I through a pipeline, pressurizing the high-temperature gas by a high-temperature fan I, and then delivering the high-temperature gas to a smoke injection device I, wherein the pressurized high-temperature gas delivers ash carried in a heat exchange element of the wind side I into the smoke side inlet through the smoke injection device I;
c. Leading out high-temperature gas from an outlet of the fourth wind side through a pipeline, pressurizing by a second high-temperature fan, then delivering the high-temperature gas to a second smoke injection device, and blowing a cold end of the fourth wind side by the second smoke injection device to improve the metal wall temperature of the cold end heat exchange element;
d. adopting a steam soot blower at the two cold ends of the wind side to perform steam soot blowing on the air preheater, and blowing off ammonium bisulfate and fly ash adhered to the ammonium bisulfate;
e. and adopting a sound wave soot blower at the three cold ends of the wind side to perform sound wave soot blowing on the air preheater, and blowing off ammonium bisulfate and fly ash adhered to the ammonium bisulfate.
In step b, the high temperature gas is pressurized to 1-3KPa by the first high temperature fan, the flow direction of the gas is that hot air is led out from the second wind side, then enters the first wind side, goes from the hot end to the cold end of the first wind side, and then goes to the flue gas side inlet.
Further, in the step c, the high-temperature gas is pressurized to 5-10KPa through the second high-temperature fan, and the gas flows from the cold end to the hot end of the fourth wind side.
Preferably, in the step c, after the cold end of the air preheater is purged by the second flue gas injection device, the comprehensive temperature of the cold end of the air preheater is controlled to be 100-200 ℃, and the extreme temperature of the bottom of the cold end of the air preheater is controlled to be not lower than 90 ℃.
Compared with the prior art, the invention has the following advantages and effects: the rotary air preheater effectively utilizes high-temperature air heat in a section at the wind side under the online full-load working condition and the non-stop condition, improves the cold end wall temperature, and simultaneously conveys the carried leaked dust back to the flue gas side inlet, thereby reducing the air leakage rate and recovering the energy. In the fourth section of the wind side, the temperature of the hot end of the heat exchange element is reasonably reduced through high-speed air circulation, the temperature section of the heat exchange element of the air preheater is controlled, the metal wall temperature of the heat exchange element of the cold end of the air preheater is raised, the ammonium bisulfate deposition zone is limited at the middle lower part of the heat exchange element of the cold end of the air preheater, the ammonium bisulfate deposition zone is controlled to be only in a single layer, cross-layer accumulation does not occur, the effective purging of the steam soot blower and the sound wave soot blower is realized on line to effectively relieve the blockage of the air preheater, the unplanned shutdown times of the air preheater are reduced, the related cost of a boiler caused by unplanned shutdown is reduced, and the reliability and the economical efficiency of a boiler unit are improved.
Drawings
Fig. 1 is a schematic structural view of an embodiment of the present invention.
In the figure: 1. an air preheater; 2. a flue gas side inlet; 3. wind side I; 4. wind side II; 5. wind side III; 6. wind side IV; 7a, a first high-temperature fan; 7b, a high-temperature fan II; 8. a steam sootblower; 9. an acoustic soot blower.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and not limited to the following examples.
Examples
Referring to fig. 1, the five-bin rotary air preheater for preventing ammonium bisulfate deposition in the embodiment comprises an air preheater 1, wherein an air preheater rotor is arranged in the air preheater 1, and a heat exchange element is arranged on the air preheater rotor; the air preheater 1 comprises a flue gas side and an air side, wherein the air side comprises a first wind side 3, a second wind side 4, a third wind side 5 and a fourth wind side 6; the inlet of the first wind side 3 is connected with the flue gas side inlet 2 through a pipeline, and a first high-temperature fan 7a is arranged on the pipeline between the inlet of the first wind side 3 and the flue gas side inlet 2; the outlet of the fourth wind side 6 is connected with the inlet of the fourth wind side 6 through a pipeline, and a second high-temperature fan 7b is arranged on the pipeline between the outlet of the fourth wind side 6 and the inlet of the fourth wind side 6; the cold end of the wind side II 4 is provided with a steam soot blower 8, and the cold end of the wind side III 5 is provided with an acoustic wave soot blower 9.
A first flue gas injection device is arranged on a pipeline between the flue gas side inlet 2 and the first high-temperature fan 7a, and a second flue gas injection device is arranged on a pipeline between the inlet of the fourth wind side 6 and the second high-temperature fan 7 b.
The first flue gas injection device is arranged on the flue gas inlet flue, and flow adjusting devices are respectively arranged on inlet pipelines of the first flue gas injection device and the first high-temperature fan 7 a; the second flue gas injection device is arranged on the inlet flue of the fourth wind side 6, and flow adjusting devices are respectively arranged on inlet pipelines of the second flue gas injection device and the second high-temperature fan 7 b.
The working method of the five-bin rotary air preheater for preventing ammonium bisulfate deposition comprises the following steps:
a. The turning direction of the air preheater rotor is sequentially a smoke side, a wind side I3, a wind side II 4, a wind side III 5, a wind side IV 6 and a smoke side, heat in the smoke heats a heat exchange element on the 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 an inlet of the wind side I3 through a pipeline, is pressurized by the high-temperature fan I7 a and then is sent to the smoke injection device I, and leaked ash carried in the heat exchange element of the wind side I3 is sent to the smoke side inlet 2 through the smoke injection device I by the pressurized high-temperature gas;
c. Leading out high-temperature gas from an outlet of the fourth wind side 6 through a pipeline, pressurizing by a second high-temperature fan 7b, then delivering the high-temperature gas to a second smoke injection device, and blowing the cold end of the fourth wind side 6 by the second smoke injection device to improve the metal wall temperature of the cold end heat exchange element;
d. Adopting a steam soot blower 8 at the cold end of the wind side II 4 to perform steam soot blowing on the air preheater 1, and blowing off ammonium bisulfate and fly ash adhered to the ammonium bisulfate;
e. and adopting a sound wave soot blower 9 at the air side three 5 cold ends to perform sound wave soot blowing on the air preheater 1, and blowing off ammonium bisulfate and fly ash adhered to the ammonium bisulfate.
In the step b, the high-temperature gas is pressurized to 1-3KPa through a first high-temperature fan 7a, the flow direction of the gas is that hot air is led out from a second wind side 4 and then enters a first wind side 3, and the gas flows from the hot end of the first wind side 3 to the cold end and then to a flue gas side inlet 2.
In the step c, the high-temperature gas is pressurized to 5-10KPa through a second high-temperature fan 7b, and the flow direction of the gas is from the cold end to the hot end of a fourth wind side 6.
In the step c, after the cold end of the air preheater 1 is purged by the smoke injection device II, the comprehensive temperature of the cold end of the air preheater 1 is controlled to be 100-200 ℃, and the extreme temperature of the bottom of the cold end of the air preheater 1 is controlled to be not lower than 90 ℃.
Although the present invention is described with reference to the above embodiments, it should be understood that the invention is not limited to the embodiments described above, but is capable of modification and variation without departing from the spirit and scope of the present invention.
Claims (1)
1. The working method of the five-bin rotary air preheater for preventing ammonium bisulfate deposition comprises an air preheater (1), wherein an air preheater rotor is arranged in the air preheater (1), and a heat exchange element is arranged on the air preheater rotor; the air preheater is characterized in that the air preheater (1) comprises a flue gas side and an air side, wherein the air side comprises a wind side I (3), a wind side II (4), a wind side III (5) and a wind side IV (6); the inlet of the first wind side (3) is connected with the flue gas side inlet (2) through a pipeline, and a first high-temperature fan (7 a) is arranged on the pipeline between the inlet of the first wind side (3) and the flue gas side inlet (2); the outlet of the wind side IV (6) is connected with the inlet of the wind side IV (6) through a pipeline, and a high-temperature fan II (7 b) is arranged on the pipeline between the outlet of the wind side IV (6) and the inlet of the wind side IV (6); the cold end of the wind side II (4) is provided with a steam soot blower (8), and the cold end of the wind side III (5) is provided with an acoustic wave soot blower (9);
A first smoke injection device is arranged on a pipeline between the smoke side inlet (2) and the first high-temperature fan (7 a), and a second smoke injection device is arranged on a pipeline between the inlet of the fourth wind side (6) and the second high-temperature fan (7 b);
The first flue gas injection device is arranged on the flue gas inlet flue, and flow adjusting devices are respectively arranged on inlet pipelines of the first flue gas injection device and the first high-temperature fan (7 a); the second flue gas injection device is arranged on an inlet flue of the fourth wind side (6), and flow regulating devices are respectively arranged on inlet pipelines of the second flue gas injection device and the second high-temperature fan (7 b);
The working method comprises the following steps:
a. The turning direction of the air preheater rotor is sequentially a smoke side, a wind side I (3), a wind side II (4), a wind side III (5), a wind side IV (6) and a smoke side, heat in the smoke heats a heat exchange element on the air preheater rotor, and the heat exchange element heats air after the rotor rotates to an air side;
b. Leading out high-temperature gas from an inlet of the first wind side (3) through a pipeline, pressurizing the high-temperature gas by the first high-temperature fan (7 a), and then delivering the high-temperature gas to the first smoke injection device, wherein the pressurized high-temperature gas delivers leaked ash carried in the heat exchange element of the first wind side (3) into the first smoke side inlet (2) through the first smoke injection device;
c. leading out high-temperature gas from an outlet of the fourth wind side (6) through a pipeline, pressurizing the high-temperature gas by a second high-temperature fan (7 b), then delivering the high-temperature gas to a second smoke injection device, and blowing the cold end of the fourth wind side (6) by the second smoke injection device to improve the metal wall temperature of the cold end heat exchange element;
d. Adopting a steam soot blower (8) at the cold end of the wind side II (4) to perform steam soot blowing on the air preheater (1) to purge the fly ash adhered with ammonium bisulfate;
e. Adopting an acoustic soot blower (9) at the cold end of the wind side III (5) to perform acoustic soot blowing on the air preheater (1) to purge the ammonium bisulfate and the fly ash adhered to the ammonium bisulfate;
In the step b, the high-temperature gas is pressurized to 1-3KPa through a first high-temperature fan (7 a), the flow direction of the gas is that hot air is led out from a second wind side (4), then enters the first wind side (3), and flows from the hot end to the cold end of the first wind side (3) to a flue gas side inlet (2);
In the step c, the high-temperature gas is pressurized to 5-10KPa through a high-temperature fan II (7 b), and the flow direction of the gas is from the cold end to the hot end of a wind side IV (6);
in the step c, after the cold end of the air preheater (1) is purged by the flue gas injection device II, the comprehensive temperature of the cold end of the air preheater (1) is controlled to be 100-200 ℃, and the extreme temperature of the bottom of the cold end of the air preheater (1) is controlled to be not lower than 90 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910303698.7A CN110118361B (en) | 2019-04-16 | 2019-04-16 | Working method of five-bin rotary air preheater for preventing ammonium bisulfate deposition |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910303698.7A CN110118361B (en) | 2019-04-16 | 2019-04-16 | Working method of five-bin rotary air preheater for preventing ammonium bisulfate deposition |
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| CN110118361A CN110118361A (en) | 2019-08-13 |
| CN110118361B true CN110118361B (en) | 2024-05-07 |
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| CN113915635A (en) * | 2021-11-22 | 2022-01-11 | 江苏峰业科技环保集团股份有限公司 | Boiler flue gas treatment system with high-efficient air heater |
| CN114360354B (en) * | 2021-12-15 | 2024-06-11 | 苏州西热节能环保技术有限公司 | Method for simulating deposition process of fly ash and ammonium bisulfate in flue gas on air preheater |
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