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EP0753701B1 - Kessel mit Denitrierungsvorrichtung - Google Patents

Kessel mit Denitrierungsvorrichtung Download PDF

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Publication number
EP0753701B1
EP0753701B1 EP19960110432 EP96110432A EP0753701B1 EP 0753701 B1 EP0753701 B1 EP 0753701B1 EP 19960110432 EP19960110432 EP 19960110432 EP 96110432 A EP96110432 A EP 96110432A EP 0753701 B1 EP0753701 B1 EP 0753701B1
Authority
EP
European Patent Office
Prior art keywords
temperature
economizer
denitrification apparatus
boiler
gas
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.)
Expired - Lifetime
Application number
EP19960110432
Other languages
English (en)
French (fr)
Other versions
EP0753701A1 (de
Inventor
Yoshihisa c/o Mitsubishi Jukogyo K.K. Arakawa
Masaaki c/o Mitsubishi Jukogyo K.K. Nagai
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.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Publication of EP0753701A1 publication Critical patent/EP0753701A1/de
Application granted granted Critical
Publication of EP0753701B1 publication Critical patent/EP0753701B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F23J15/006—Layout of treatment plant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/008—Adaptations for flue-gas purification in steam generators

Definitions

  • the present invention relates to a boiler as defined in the preamble portion of claim 1, for firing a heavy oil (including high viscosity residual oil, super heavy oil (Orinoco oil, for example) and water emulsion fuel), etc.
  • a heavy oil including high viscosity residual oil, super heavy oil (Orinoco oil, for example) and water emulsion fuel
  • Heavy oil contains a high amount of nitrogen content and sulfur content as compared with the usual C fuel oil. For this reason, in order to use such heavy oil for boilers under the environment regulations, there are many cases where installation of a denitrification apparatus or a desulfurization apparatus is required for reducing NOx density or SOx density in the flue gas.
  • Fig. 7 shows a diagrammatic view of a heavy oil firing boiler in the prior art, wherein numeral 1 designates a furnace, and on the downstream side of the furnace 1, there are provided a superheater 2, a reheater 3, an economizer 4A, a denitrification apparatus 6, an air preheater 8, an electrostatic precipitator 10, a gas-gas heater 11 and a desulfurization apparatus 12, in turn.
  • Numeral 15A designates an economizer gas by-pass duct and numeral 16A designates a flow regulating damper interposed in the economizer gas by-pass duct 15A.
  • heavy oil contains a high amount of heavy metals, such as vanadium, nickel, etc. and in a heavy oil firing boiler having a denitrification apparatus, a vanadium compound, in addition to SO 3 generated at the combustion zone, covers the surface of NOx removal catalysts so as to act as an oxidation catalyst, thus conversion ratio of SOx to SO 3 becomes also higher.
  • heavy metals such as vanadium, nickel, etc.
  • a vanadium compound in addition to SO 3 generated at the combustion zone, covers the surface of NOx removal catalysts so as to act as an oxidation catalyst, thus conversion ratio of SOx to SO 3 becomes also higher.
  • the flue gas temperature also becomes high, and if it exceeds approximately 180°C, the ammonium injected at the inlet of the electrostatic precipitator for SO 3 removal is resolved to generate an ammonium hydrogen sulfate of low melting temperature, thereby ash clogging or corrosion, or in some cases a charging obstruction, might be caused, hence the elevation of the flue gas temperature as time passes must be suppressed as much as possible.
  • a boiler comprising a high temperature economizer and a low temperature economizer and a denitrification apparatus arranged therebetween as well as a damper regulated bypass around the high temperature economizer is disclosed in US-A-5 423 272 and in FR-A-2 360 045.
  • the present invention has following features:
  • the denitrification apparatus can be operated at an optimized operational temperature and further the heat recovery proportion of the economizers and the air preheater can be selected without being influenced by the operational temperature of the denitrification apparatus, hence the temperature effectiveness of the air preheater can be maximized and economical operation becomes possible.
  • the heating area of the low temperature economizer can be set in surplus based on the heat transfer coefficient taking account of dirt, and by the gas amount by-passing the low temperature economizer being regulated correspondingly to the degree of dirt of the low temperature economizer, the gas temperature at the outlet of the air preheater and the gas temperature at the outlet of the electrostatic precipitator can be maintained within an appropriate range, hence a long term continuous and stable operation becomes possible.
  • the heating area of the high temperature economizer can be set in surplus based on the heat transfer coefficient taking account of dirt, and by the gas amount by-passing the high temperature economizer being regulated correspondingly to the degree of dirt of the high temperature economizer, the operational temperature of the denitrification apparatus, the gas temperature at the outlet of the air preheater and the gas temperature of the electrostatic precipitator can be maintained within an appropriate range, hence a long term continuous and stable operation becomes possible.
  • Fig. 1 is a diagrammatic view of a boiler of a first example for explaining certain features of the present invention.
  • Fig. 2 is a diagrammatic view of a boiler of a second example for explaining certain features of the present invention.
  • Fig. 3 is a graph showing time passing changes of gas temperature at an inlet of a denitrification apparatus of heavy oil firing boilers.
  • Fig. 4 is a diagrammatic view of a boiler of a preferred embodiment according to the present invention.
  • Fig. 5 is a graph showing time passing changes of gas temperature at an outlet of an air preheater of heavy oil firing boilers.
  • Fig. 6 is a diagrammatic view of a boiler of a further preferred embodiment according to the present invention.
  • Fig. 7 is a diagrammatic view of a heavy oil firing boiler in the prior art.
  • FIG. 1 A first example for explaining certain features of the present invention is described with reference to Fig. 1.
  • This example relates to a modification, as herebelow, of the boiler shown in Fig. 7, and same parts of Fig. 1 as those of Fig. 7 are designated by same numerals and description thereof is omitted.
  • the economizer is divided into that on the upstream side and that on the downstream side of the denitrification apparatus 6, that is, the economizer is divided into a high temperature economizer 4 and a low temperature economizer 7 and the high temperature economizer 4 is disposed on the upstream side of the denitrification apparatus 6 and the low temperature economizer 7 on the downstream side of same, respectively.
  • the economizer by-pass duct 15A in the boiler shown in Fig. 7 is not provided.
  • the denitrification apparatus 6 can be maintained at an appropriate operational temperature and the temperature effectiveness of the air preheater can be maximized so that economical operation can be made.
  • FIG. 2 A second example for explaining certain features of the present invention is described with reference to Fig. 2.
  • the heating area of the high temperature economizer 4 is set in surplus, a high temperature economizer gas by-pass duct 15 by-passing said high temperature economizer 4 is provided and a flow regulating damper 16 is interposed in said high temperature economizer gas by-pass duct 15.
  • the denitrification apparatus can be controlled at a temperature at which the right performance can be effected. Further, as shown by the line in Fig. 3, with respect to the time passing elevation also of the gas temperature due to the dirt of the heating surface, the elevation of the flue gas temperature can be suppressed by the effect of said surplus heating area of the high temperature economizer 4 and'a long term continuous and stable operation can be made possible.
  • FIG. 4 A preferred embodiment according to the present invention is described with reference to Fig. 4.
  • the heating area of the low temperature economizer 7 is set in surplus, a low temperature economizer by-pass duct 18 by-passing said low temperature economizer 7 is provided and a flow regulating damper 19 is interposed in said low temperature economizer by-pass duct 18.
  • the heating area of the low temperature economizer 7 on the downstream side of the denitrification apparatus 6 being set in surplus and by the gas flow by-passing the low temperature economizer 7 and flowing through the low temperature economizer by-pass duct 18 being regulated and mixed into the outlet portion of the low temperature economizer 7, as shown by the line in Fig. 5, the time passing elevation of the gas temperature at the outlet of the air preheater 8, or the gas temperature at the inlet of the electrostatic precipitator 18, due to the dirt of the heating surface of said low temperature economizer 7 can be suppressed by the effect of the surplus heating area of this low temperature economizer 7.
  • FIG. 6 A further preferred embodiment according to the present invention is described with reference to Fig. 6.
  • This preferred embodiment comprises a combination of a high temperature economizer 4 and a high temperature economizer by-pass duct 15 having a flow regulation damper 16, as in said second example, and a low temperature economizer 7 and a low temperature economizer by-pass duct 18 having a flow regulating damper 19, as in said above mentioned preferred embodiment according to the present invention.
  • the denitrification apparatus 6 can be controlled at a temperature at which the right performance can be effected and yet with respect to the time passing elevation of the gas temperature due to the dirt of the heating surface also, the elevation of the flue gas temperature can be suppressed by the effect of the surplus heating area of this high temperature economizer 4 and a long term continuous and stable operation can be made.
  • the denitrification apparatus can be operated in the range of the maximized operational temperature, the temperature of the air preheater and the electrostatic precipitator on the downstream side can be made appropriate and a long term continuous and stable operation can be made possible.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chimneys And Flues (AREA)
  • Treating Waste Gases (AREA)
  • Air Supply (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Claims (2)

  1. Heizkessel mit einem Vorwärmer (economizer), der in einen Hochtemperatur-Vorwärmer (4) und einen Niedrigtemperatur-Vorwärmer (7) aufgeteilt ist, die jeweils an der stromaufwärtigen Seite bzw. an der stromabwärtigen Seite einer Denitrierungsvorrichtung (6) angeordnet sind,
       dadurch gekennzeichnet, daß eine den Niedrigtemperatur-Vorwärmer (7) umgehende Leitung (18) vorgesehen ist und ein Strömungsregelungsschieber (19) in der Leitung (18) zwischengeschaltet ist.
  2. Heizkessel gemäß Anspruch 1, dadurch gekennzeichnet, daß eine den Hochtemperatur-Vorwärmer (4) umgehende Leitung (15) vorgesehen ist, und ein Strömungsregelungsschieber (16) in der den Hochtemperatur-Vorwärmer (4) umgehenden Leitung (15) zwischengeschaltet ist.
EP19960110432 1995-07-12 1996-06-27 Kessel mit Denitrierungsvorrichtung Expired - Lifetime EP0753701B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP17605595 1995-07-12
JP17605595A JPH0926105A (ja) 1995-07-12 1995-07-12 ボイラ
JP176055/95 1995-07-12

Publications (2)

Publication Number Publication Date
EP0753701A1 EP0753701A1 (de) 1997-01-15
EP0753701B1 true EP0753701B1 (de) 1999-09-01

Family

ID=16006936

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960110432 Expired - Lifetime EP0753701B1 (de) 1995-07-12 1996-06-27 Kessel mit Denitrierungsvorrichtung

Country Status (4)

Country Link
EP (1) EP0753701B1 (de)
JP (1) JPH0926105A (de)
CA (1) CA2179002A1 (de)
DE (1) DE69604027T2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014000977A1 (de) 2012-06-27 2014-01-03 Siemens Aktiengesellschaft Abgasreinigungsvorrichtung und verfahren zur reduktion von stickoxiden aus einem abgas einer fossil befeuerten kraftwerksanlage

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19929088C1 (de) 1999-06-24 2000-08-24 Siemens Ag Fossilbeheizter Dampferzeuger mit einer Entstickungseinrichtung für Heizgas
RU2267697C2 (ru) * 2004-03-09 2006-01-10 Закрытое Акционерное Общество "Энергия Экология Инжиниринг" (ЗАО "СП ЕЕЕ") Схема подогрева воздуха и воды для паровых котлов
EP1820560A1 (de) 2006-02-16 2007-08-22 Siemens Aktiengesellschaft Dampferzeuger mit katalytischer Beschichtung von Wärmetauscheroberflächen zur Abgasreinigung
US20120222591A1 (en) 2011-03-04 2012-09-06 Foster Wheeler North America Corp. Method of and Apparatus for Selective Catalytic NOx Reduction in a Power Boiler
JP5984731B2 (ja) * 2013-04-05 2016-09-06 三菱日立パワーシステムズ株式会社 脱硝システム
JP5624646B1 (ja) * 2013-05-23 2014-11-12 電源開発株式会社 火力発電プラント及び火力発電プラントの運転方法。
CN103994455A (zh) * 2014-04-04 2014-08-20 彭维明 燃煤电厂烟气高效除尘系统及方法
CN103953914B (zh) * 2014-05-04 2016-04-06 国电龙源节能技术有限公司 锅炉余热回收系统
EP3001102B1 (de) * 2014-09-26 2020-10-28 Stork Thermeq B.V. Wärmerückgewinnung und Kraftwerk
CN106931458A (zh) * 2017-02-27 2017-07-07 华北理工大学 一种四条旁路省煤器高温旁路系统
CN110805918A (zh) * 2019-10-16 2020-02-18 华电电力科学研究院有限公司 一种利用旁路烟气进行吹灰的装置及方法
CN111911899A (zh) * 2020-07-10 2020-11-10 国家电投集团电站运营技术（北京）有限公司 具有防低温省煤器硫酸氢氨堵塞功能的锅炉
CN112050247A (zh) * 2020-09-28 2020-12-08 西安热工研究院有限公司 一种锅炉低负荷脱硝的系统和方法
DE102021113713A1 (de) 2021-05-27 2022-12-01 Karl Schräder Nachf. Inh. Karl-Heinz Schräder e. K. Vorrichtung zur Reinigung der Rauchgase einer Holzbrennstoff-Feuerstätte

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5315639A (en) * 1976-07-27 1978-02-13 Hitachi Zosen Corp Boiler has denitration device built-in
CA1092910A (en) * 1976-07-27 1981-01-06 Ko'hei Hamabe Boiler apparatus containing denitrator
US4353207A (en) * 1980-08-20 1982-10-12 Westinghouse Electric Corp. Apparatus for removing NOx and for providing better plant efficiency in simple cycle combustion turbine plants
JPS6283057A (ja) * 1985-10-09 1987-04-16 Mitsubishi Heavy Ind Ltd 集塵装置
US5423272A (en) * 1994-04-11 1995-06-13 Combustion Engineering, Inc. Method for optimizing the operating efficiency of a fossil fuel-fired power generation system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014000977A1 (de) 2012-06-27 2014-01-03 Siemens Aktiengesellschaft Abgasreinigungsvorrichtung und verfahren zur reduktion von stickoxiden aus einem abgas einer fossil befeuerten kraftwerksanlage
US9387436B2 (en) 2012-06-27 2016-07-12 Siemens Aktiengesellschaft Exhaust-gas purification device and method for the reduction of nitrogen oxides from an exhaust gas of a fossil-fired power plant

Also Published As

Publication number Publication date
JPH0926105A (ja) 1997-01-28
DE69604027D1 (de) 1999-10-07
DE69604027T2 (de) 2000-02-24
EP0753701A1 (de) 1997-01-15
CA2179002A1 (en) 1997-01-13

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