EP2287550A2 - Verfahren zur Online-Reinigung von Luftvorerhitzern - Google Patents

Verfahren zur Online-Reinigung von Luftvorerhitzern Download PDF

Info

Publication number
EP2287550A2
EP2287550A2 EP10007034A EP10007034A EP2287550A2 EP 2287550 A2 EP2287550 A2 EP 2287550A2 EP 10007034 A EP10007034 A EP 10007034A EP 10007034 A EP10007034 A EP 10007034A EP 2287550 A2 EP2287550 A2 EP 2287550A2
Authority
EP
European Patent Office
Prior art keywords
rotor
passageways
soot
soot blower
depth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10007034A
Other languages
English (en)
French (fr)
Other versions
EP2287550A3 (de
Inventor
Scott Thomas
Charles A. Lockert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Breen Energy Solutions LLC
Original Assignee
Breen Energy Solutions LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Breen Energy Solutions LLC filed Critical Breen Energy Solutions LLC
Publication of EP2287550A2 publication Critical patent/EP2287550A2/de
Publication of EP2287550A3 publication Critical patent/EP2287550A3/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • F28D19/00—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium
    • F28D19/04—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier
    • F28D19/041—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier with axial flow through the intermediate heat-transfer medium
    • F28D19/042—Rotors; Assemblies of heat absorbing masses
    • F28D19/044—Rotors; Assemblies of heat absorbing masses shaped in sector form, e.g. with baskets
    • 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
    • F28G15/00—Details
    • 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
    • F28G9/005—Cleaning by flushing or washing, e.g. with chemical solvents of regenerative heat exchanger

Definitions

  • the present invention is directed toward a method for cleaning rotating regenerative air heaters used in coal-fired electricity generating plants.
  • One such preheating technique employs a Ljungstrom air preheater.
  • This air preheater has two side-by-side ducts with flue gas flowing through one duct while an inflow of combustion air is passed through the other duct, the two gas flows being in opposite directions.
  • a rotor is positioned to rotate through both ducts about an axis between the two ducts, transferring heat from the flue gas to the combustion air.
  • Air preheaters are normally operated at sufficiently high temperatures to inhibit condensation inside the heat exchanger of pollutants such as sulfuric acid vapor present in the flue gas.
  • the outlet flue gas temperature is maintained at least above 300 degrees F (149 degrees C), and as high as 350 degrees F (177 degrees C). At these temperatures, aerosol condensation of gaseous sulfuric acid and the associated corrosive effects on the preheater are minimized.
  • Sootblowers for cleaning air heaters are generally of the "retractable” style or the “swing-arm” style. Advantages and disadvantages are found in both styles.
  • Swing arm style soot blowers for cleaning rotary regenerative air preheaters employ a swing-arm mounted for rotation through a set angle or arc with one or more nozzles at the end that blow the soot blowing medium (steam, air or water) onto the rotor as the rotor turns and as the swing-arm rotates through the arc.
  • the soot blower is normally mounted on the cold end of the rotor which is the outlet end for the flue gas.
  • soot blowers typically employ a drive mechanism which includes a worm gear and a worm wheel or chain drive which rotates a lever throw arm.
  • a connecting link attaches the lever throw arm to a lever attached to the soot blower arm mounting plate.
  • This linkage arrangement causes the lever and the soot blower mounting plate to reciprocate back and forth through an arc.
  • This type of mechanism is disclosed in United States Patent No. 6,065,528 to Fierle et al.
  • the swing-arm soot blower constantly changes speed or angular velocity as it sweeps across the rotor. At the beginning and end of its sweep, the velocity is zero with the maximum velocity being at the center of the sweep.
  • Retractable style sootblowers have found more common application in recent years due to their similarity to sootblowers used in other portions of the furnace and due to an improved ability to control their position in the cleaning process.
  • Retractable sootblowers consist of two concentric tubes, one fixed in position and attached to a media source (air, steam, water, etc.) and the other capable of controlled movement into and out of the boiler ducts laterally along the same axis as the fixed tube.
  • a packing material is placed between the inside surface of the outer tube and the outside surface of the inner tube at a the end of the movable tube closest to the media supply line.
  • the end of the inner tube not connected to the cleaning media is open.
  • the end of the outer tube furthest from the cleaning media line is enclosed by a rounded cap containing one or more outlet holes (or nozzles).
  • Cleaning media is introduced into the stationary tube from the media source line through a device called a popet valve.
  • the valve When the valve is opened, the cleaning media is introduced under pressure into the inside of the fixed tube allowing it to travel out the open outer end and into the volume of the outer tube.
  • the packing material prohibits the media from exiting the assembly at the joining point and forces all of the media to travel the length of the outer tube to exit through the cleaning nozzle at the far end of the movable tube.
  • ammonia slippage is essentially a function of the required degree of removal of nitrogen oxide, of the activity of the catalyst, and of the quality of mixing of the injected ammonia with the flue gas. It is also important for the flow through the reactor to be uniform by means of an even flue gas velocity at all locations of the reactor cross section and for it to be possible for all the catalytic converter material to be reached without obstacle.
  • ammonia slippage may occur distributed unevenly across the cross-section of the reactor.
  • ammonia slippage amounts to only a few ppm.
  • levels which are a multiple of this average may occur. This ammonia as well as sulfuric acid vapor will be contained in the flue gas entering the air preheater.
  • the temperature of the flue gas entering the air preheater is typically in the range of 600 to 750 degrees F (315 to 371 degrees C).
  • the sulfur oxides react with the ammonia from the ammonia slippage in accordance with the following equation: NH 3 + H 2 O + SO 3 ⁇ NH 4 HSO 4 , i.e., to form ammonium bisulfate, or according to the equation: 2NH 3 + SO 3 + H 2 O ⁇ (NH 4 ) 2 SO 4 , i.e., to form ammonium sulfate.
  • the gas cools to the range of 230 to 350 degrees F (110 to 177 degrees C).
  • degrees F 110 to 177 degrees C.
  • ammonium bisulfate in addition to sulfuric acid, condenses as a sticky liquid on the air preheater baskets.
  • ammonium bisulfate is so sticky, it captures ash particles and rapidly plugs the gas passages of the device. These deposits may also cause corrosion. Hitherto, this problem has been counteracted by limiting the ammonia slippage to less than 5 ppm, and in some installations even to less than 2 ppm. This entails a correspondingly high outlay for the required catalytic reactor volume. Nevertheless, it is impossible to rule out the possibility of a higher level of ammonia slippage than the mean occurring at some locations over the reactor cross section. Therefore, in some cases a relatively high--even excessively high--ammonia concentration may occur, so that the air preheater is damaged in this area by the above-mentioned processes.
  • Soot blowers as mentioned above are seldom effective in removing ammonium bisulfate deposits.
  • the deposits typically occur in the middle sections of the rotor where soot blower energy has dissipated before the deposit can be reached.
  • the presence of deposits is evidenced by an increased pressure drop across the air preheater on both the air and the gas sides. When this occurs, the power generating unit must be shut down and the air preheater washed with highpressure water.
  • the present invention is directed toward a method of cleaning those sticky deposits, including ammonium bisulfate, sulfuric acid and other materials, from a rotary air preheater without shutting down the steam generating system. Further, this method can be used to mitigate the accumulation of deposits to the point of pluggage by changing the operating strategy of conventional soot blowers.
  • This method is particularly effective when used with the type of rotary air preheater shown in Figure 1 .
  • This type of preheater has a heat exchange rotor containing adjacent passageways through which air and flue gas are directed and which is rotated about an axis.
  • a soot blower is capable of being positioned adjacent any selected depth from the outer circumference of the rotor such that a soot blowing medium can be blown from the soot blower into passageways at the selected depth as the rotor is rotated.
  • the rotor In a conventional preheater the rotor is rotated at a constant angular velocity.
  • the angular velocity of the rotor is changed during soot blowing according to the depth of the soot blower nozzle from the outer circumference of the rotor. Specifically the angular velocity is adjusted so that all of the passageways pass over the soot blower at the same or substantially the same tangential velocity.
  • Figure 1 is a perspective view of a typical air preheater in which flue gas travels in a vertical, up or down direction and is intended to illustrate one type of air preheater in which the present invention is used.
  • the present invention may be applied to horizontal, vertical (cold end on the top) and vertical inverted (cold end on the bottom) air preheaters.
  • Figure 1 depicts a vertical air preheater with the cold end on the bottom.
  • the air preheater comprises a rotor housing 12 in which is mounted the heat exchange rotor 14.
  • the rotor is mounted for rotation on the shaft 16 which extends between the upper center section 18 and the lower center section 20.
  • the rotor is divided into sectors or passageways 22 by the diaphragm plates 24 and heat exchange baskets 26 are stacked into these sectors 22.
  • the transition duct assemblies Located at the top and bottom of the air preheater and attached to the rotor housing 12 and to the top and bottom center sections 18 and 20, are the transition duct assemblies identified as 28, 30, 32 and 34. These transition duct assemblies attach the air preheater to the ducting for the air supply to and the flue gas from a steam generator or other combustion equipment.
  • the flue gas may enter the air preheater through transition duct 28, transfer the heat to the revolving rotor 14, and exit through transition duct 30.
  • the combustion air enters through transition duct 32, picks up the heat from the rotor 14 and exits through transition duct 34.
  • These transition ducts are constructed to make the transition between the generally circular air preheater and the rectangular power plant ducts.
  • soot blowers there are two soot blowers, one located on the top (or hot end) of the air heater and the other located at the bottom (or cold end) as shown on Figure 1 . If only one soot blower is used the soot blower is normally located at the cold end (the lower end of Figure. 1 ) because most of the deposits occur at the cold end (exit of the flue gas).
  • the air preheater rotates in the range of 3/4 to 4.0 revolutions per minute (RPM).
  • RPM revolutions per minute
  • the current invention allows complete cleaning regardless of the nature of the deposits.
  • the soot blower is fully inserted to the middle of the rotor with the air preheater rotating at its normal speed. Then the soot blower is retracted in a stepwise fashion. Each step can be any convenient measure, but the greatest success has been achieved with steps of 15 to 60 millimeters.
  • the air preheater rotor RPM is adjusted such that the tangential velocity of the portion of the rotor which passes over the end of the soot blower is constant.
  • the sootblower steps (or indexes) to another location, stops, rotor speed is adjusted to match the new insertion depth and a complete rotor cycle is executed.
  • Complete cleaning at any step may be evidenced by the high pressure spray from the bottom penetrating all the way to the top of the air heater when high pressure water is used as the cleaning media.
  • the size of each step should be chosen according to visual observation or other means.
  • a variable speed drive motor 40 controls rotor RPM and is programmed through the use of a controller 48 to automatically set the rotor RPM in proportion to the soot blower insertion distance.
  • the controls would also specify a minimum RPM (typically 0.2 to 0.5 RPM) to prevent stalling the motor that drives the RPM.
  • the minimum RPM can be different for each air heater, depending on whether it is rotating vertically or horizontally, the style and effectiveness of the support bearings and on the tightness in the sealing mechanisms.
  • the controller may also control the motors 43, 44 that advance and retract the soot blowers and may control the blower motor 46.
  • soot blowers top and bottom
  • bottom soot blower is needed when applying this method.
  • Using only the bottom soot blower saves considerable cleaning time and also causes less wear and tear on the hot end basket material. In this manner the number of daily cleans has been shown to be reduced from 4 times per day to 1 or 2 times per day.
  • the benefits of the method are shown in the following example.
  • the air preheater at a North Carolina electric generating station had fouled with ammonium bisulfate deposits to a point where the steam media blowers could not maintain acceptable pressure drop ( ⁇ P) across the rotor.
  • the boiler had to be removed from service every few months to water-wash the air preheaters.
  • the hot end (top section) of these air preheaters is 29-inches thick, while the cold end (bottom section) is 41-inches thick. There are 10-inches of spacing above and below these sections where the soot blowers operate.
  • the power station has two air preheaters of the same size and construction that operate under substantially the same conditions.
  • One preheater was cleaned using the present method while the other preheater was not cleaned.
  • the rotor in the air preheater that was cleaned was modified to permit changes in the rotational speed of the rotor as directed by a controller.
  • a soot blower was positioned opposite the innermost ring of passageways or sectors in the rotor and was activated to blow steam through the passageways as they moved over the soot blower. At this time, each rotor was turning at normal operating speed. The soot blower was then moved in step-wise fashion toward the outer ring of sectors or passageways.
  • the speed of the rotor was slowed such that the angular velocity of the sectors was the same as the angular velocity of the sectors in the innermost depth when the process began.
  • the rotor speed was increased back to the normal operating speed at which the process began. Throughout the process the power station continued to operate normally.
  • the speed of the rotor was 1.5 RPM when the process began and 0.33 RPM when the last ring was cleaned. The cleaning process took between 3 and 4 hours.
  • FIG. 3 shows the pressure drop ( ⁇ P) across the air preheater on the air and gas sides before, during and after cleaning using high pressure water media. Steady operation with partially fouled air heaters is shown on the left side of this figure on February 22, 2008. The air preheater was cleaned on line using this method twice during the period beginning on February 22 and ending on February 24, 2008. During cleaning the boiler output was reduced which reduced the air flow through the preheaters.
  • Figure 3 is a graph reporting the pressure drop across the combustion air side and the flue gas side of the air preheaters and the total airflow through the preheaters during a period from February 22 through 24, 2008.
  • the legend in the lower right that identifies the location of the sensors. 2A indicates an air preheater, the air preheater that was not cleaned. 2B identifies a preheater that was cleaned.
  • the pressure drop across the input air side of the preheater is identified as SH PHTR AIR DP.
  • the pressure drop across the flue gas side of the preheater is identified as SAH GAS SIDE DP.
  • SAH GAS SIDE DP The pressure drop across the flue gas side of the preheater During the cleaning periods the boiler load was reduced which lowered the total air flow through the preheaters. Consequently, total air flow is also shown in Figure 3 .
  • FIG. 4 Such a preheater is shown in Figure 4 .
  • the rotor 54 turns in a vertical plane on shaft 52 while the flue gas and the intake air flow in a horizontal direction through transition ducts 55, 56, 57 and 58.
  • the rotor is divided into sectors 62 by the diaphragm plates 64 and heat exchange baskets 66 are stacked into these sectors 62.
  • Soot blowers 61 and 63 are provided on the flue gas side of the preheater.
  • the rotor 64 and soot blower or soot blowers 61 and/or 63 are operated so that all of the passageways pass over the soot blower at the same or substantially the same angular velocity.
  • the present method does not require cleaning of every sector. For some installations it may be satisfactory to clean some but not all sectors in one pass of the soot blower. Then in another pass or at another time other sectors or passageways can be cleaned. Indeed, there may be some preheaters in which certain passageways are rarely or never cleaned.

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)
  • Incineration Of Waste (AREA)
EP10007034.1A 2009-07-08 2010-07-07 Verfahren zur Online-Reinigung von Luftvorerhitzern Withdrawn EP2287550A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12/499,314 US20110005706A1 (en) 2009-07-08 2009-07-08 Method for Online Cleaning of Air Preheaters

Publications (2)

Publication Number Publication Date
EP2287550A2 true EP2287550A2 (de) 2011-02-23
EP2287550A3 EP2287550A3 (de) 2014-04-16

Family

ID=42941980

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10007034.1A Withdrawn EP2287550A3 (de) 2009-07-08 2010-07-07 Verfahren zur Online-Reinigung von Luftvorerhitzern

Country Status (4)

Country Link
US (1) US20110005706A1 (de)
EP (1) EP2287550A3 (de)
JP (1) JP2011017524A (de)
CN (1) CN101947527A (de)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102705845A (zh) * 2012-06-29 2012-10-03 中国神华能源股份有限公司 全伸缩型烟气换热器吹灰器的吹灰方法和吹灰器
CN103047674A (zh) * 2012-12-28 2013-04-17 北京哈宜节能环保科技开发有限公司 一种漏风循环控制装置
KR101353989B1 (ko) 2013-05-21 2014-01-22 알스톰 테크놀러지 리미티드 공기 예열기에서 파울링을 감소시키는 방법
KR101387024B1 (ko) * 2013-11-25 2014-04-21 한모기술주식회사 열교환기용 복합 세정 시스템
US9587894B2 (en) * 2014-01-13 2017-03-07 General Electric Technology Gmbh Heat exchanger effluent collector
CN104634149B (zh) * 2015-02-04 2016-08-24 马军 带自动清洗功能的从废热空气中回收热量的换热器
KR101676862B1 (ko) * 2015-04-07 2016-11-17 주식회사 에이스글로비즈 자동세정재생형 전열교환시스템
DE202016005060U1 (de) * 2016-05-27 2016-10-13 Balcke-Dürr GmbH Luftvorwärmeinrichtung, insbesondere für eine Müllverbrennungsanlage, und Müllverbrennungsanlage
CN107191963B (zh) * 2017-07-10 2023-07-25 东方电气集团东方锅炉股份有限公司 一种回转式空气预热器及该回转式空气预热器防硫酸氢铵堵塞的方法
CN107388278A (zh) * 2017-08-07 2017-11-24 张玉伟 一种防积堵的回转式空气预热器转子
CN108871046B (zh) * 2018-05-21 2020-06-30 合力正华（北京）工程技术有限公司 自动吹洗***和自动吹洗方法
CN108692331B (zh) * 2018-08-07 2024-01-26 上海敖征实业有限公司 一种空气预热器
CN109373800A (zh) * 2018-10-10 2019-02-22 广东粤电靖海发电有限公司 可在线清洗的回转式空气预热***及在线清洗方法
CN109407637B (zh) * 2018-11-28 2021-04-09 华能海南发电股份有限公司 基于电厂dcs***气换热器精准定位吹扫的控制方法
CN112129160A (zh) * 2019-06-24 2020-12-25 上海梅山钢铁股份有限公司 一种换热器在线循环清扫装置
KR20210012652A (ko) * 2019-07-26 2021-02-03 주식회사 지스코 열교환기 세정 시스템 및 열교환기 세정 방법
US20220349664A1 (en) * 2019-07-26 2022-11-03 Geesco Co., Ltd. Heat exchanger cleaning system and heat exchanger cleaning method
CN111536826A (zh) * 2020-05-19 2020-08-14 天津全诚桓金环保科技有限公司 一种回转式空气预热器的免拆绿色清洗工艺
CN112682814A (zh) * 2020-12-22 2021-04-20 南京市利澜电力节能科技有限公司 一种多台空预器***的清堵装置及其清堵方法
CN113506555B (zh) * 2021-07-20 2024-06-25 中国计量大学 一种旋笛声波发声装置
CN116221761B (zh) * 2023-03-21 2023-09-22 江阴金童石化装备有限公司 一种径向流回转蓄热式空气预热器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2812923A (en) 1954-03-11 1957-11-12 Air Preheater Preheater washing device
US6065528A (en) 1999-08-09 2000-05-23 Abb Air Preheater, Inc. Air preheater cleaner

Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2761653A (en) * 1953-06-29 1956-09-04 Air Preheater Rotary heater washer control system
US3782336A (en) * 1971-10-21 1974-01-01 Diamond Power Speciality Method and apparatus for cleaning heated surfaces
US4256511A (en) * 1979-09-17 1981-03-17 The Dow Chemical Company High energy wash of ljungstrom air preheater
US5044424A (en) * 1980-12-19 1991-09-03 Monro Richard J Heat generator
JPS5963499A (ja) * 1982-10-01 1984-04-11 Sumitomo Metal Mining Co Ltd クリ−ニング用ノズルの制御方法
US4496525A (en) * 1983-07-25 1985-01-29 Nalco Chemical Company Method for using chemical additives to protect utility boiler air heaters while increasing unit generation capacity
US4628836A (en) * 1984-08-24 1986-12-16 Waterscience, Inc. Process for inhibiting corrosion and minimizing deposits in an air preheater system
JPS61250497A (ja) * 1985-04-26 1986-11-07 クラフタンラ−ゲン　アクチエンゲゼルシヤフト 熱交換器マトリツクス
US4850423A (en) * 1988-02-10 1989-07-25 Halliburton Company Air preheater water jet cleaning apparatus
JPH0810739Y2 (ja) * 1991-07-29 1996-03-29 株式会社タクマ 煤吹き装置
JPH05295626A (ja) * 1992-04-16 1993-11-09 Fukuhara Seiki Seisakusho:Kk 集塵・除塵装置におけるフィルターの清掃装置
JPH05322150A (ja) * 1992-05-25 1993-12-07 Mitsubishi Heavy Ind Ltd 熱交換器の煤吹装置
US5366561A (en) * 1993-05-06 1994-11-22 Butterworth Jetting Systems, Inc. Air preheater cleaning method
DE4442055A1 (de) * 1994-11-25 1996-05-30 Rothemuehle Brandt Kritzler Regenerativ-Wärmetauscher
US5626184A (en) * 1995-08-24 1997-05-06 Abb Air Preheater, Inc. Sootblower
DE19929765A1 (de) * 1999-06-29 2001-01-11 Siemens Ag Reinigungseinrichtung für Rauchgas
US6516871B1 (en) * 1999-08-18 2003-02-11 Alstom (Switzerland) Ltd. Heat transfer element assembly
US6260606B1 (en) * 1999-12-16 2001-07-17 Abb Air Preheater, Inc. Rotor construction for air preheater
EP1143037B1 (de) * 2000-04-07 2007-02-14 Asahi Glass Co., Ltd. Verfahren zum Entfernen einer sauren Ablagerung
US6575122B2 (en) * 2001-07-20 2003-06-10 Diamond Power International, Inc. Oscillating sootblower mechanism
US7286960B2 (en) * 2004-09-30 2007-10-23 General Electric Company Systems and methods for monitoring fouling and slagging in heat transfer devices in coal fired power plants
JP2007192417A (ja) * 2006-01-17 2007-08-02 Nippon Steel Corp スートブロワ及びスートブロワの制御方法
JP4786560B2 (ja) * 2007-01-22 2011-10-05 中国電力株式会社 スートブロワ装置およびその運転方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2812923A (en) 1954-03-11 1957-11-12 Air Preheater Preheater washing device
US6065528A (en) 1999-08-09 2000-05-23 Abb Air Preheater, Inc. Air preheater cleaner

Also Published As

Publication number Publication date
US20110005706A1 (en) 2011-01-13
CN101947527A (zh) 2011-01-19
JP2011017524A (ja) 2011-01-27
EP2287550A3 (de) 2014-04-16

Similar Documents

Publication Publication Date Title
EP2287550A2 (de) Verfahren zur Online-Reinigung von Luftvorerhitzern
JP5460875B2 (ja) 煙道ガス処理及び熱回収システム
TWI274130B (en) Exhaust gas treating apparatus
TWI507643B (zh) 可減少冷端積垢之再生型空氣預熱器
US6065528A (en) Air preheater cleaner
ZA200100150B (en) High affinity ligands for nociceptin receptor ORL-1.
CN108393310B (zh) 采用干冰颗粒清洗回转式空气预热器的***及其使用方法
CN110486743B (zh) 一种用于锅炉水平烟道的吹灰装置
EP3789722A1 (de) Russbläsersystem vom typ eines hin- und hergehenden rechen
CN208282145U (zh) 一种防止积灰沾污沉积的电站锅炉回转式空气预热器
JP2012002499A5 (de)
KR101393457B1 (ko) 저온 단부 파울링을 감소시키기 위한 재생 공기 예열기 디자인
US4405013A (en) Rotary type heat pipe heat exchanger
US6571420B1 (en) Device and process to remove fly ash accumulations from catalytic beds of selective catalytic reduction reactors
CN111237799A (zh) 一种烟气顺流分切控堵治漏***及其控堵治漏方法
US4903756A (en) Heat generator
KR101353989B1 (ko) 공기 예열기에서 파울링을 감소시키는 방법
KR20130061201A (ko) 저온 단부 파울링을 감소시키기 위한 재생 공기 예열기 디자인
CN210584473U (zh) 一种脱硝***在线除灰装置
CN210153850U (zh) 一种防止空气预热器堵塞的清洗***
Vijay et al. Optimization of soot blower operation in boiler to improve efficiency
WO2017088924A1 (en) Method and apparatus for preventing fouling of a heat exchanger element
CN110201533B (zh) 一种scr脱硝***催化剂清排灰装置及其工作方法
CN219530913U (zh) 一种组合式空气预热器
KR20150038779A (ko) 공기예열기 세정설비의 분사 방법

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20100707

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME RS

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME RS

RIC1 Information provided on ipc code assigned before grant

Ipc: F28G 15/00 20060101ALI20140307BHEP

Ipc: F28G 9/00 20060101ALI20140307BHEP

Ipc: F28G 1/16 20060101ALI20140307BHEP

Ipc: F28D 19/04 20060101AFI20140307BHEP

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20141017