EP0753701A1 - Chaudière avec appareil de dénitrification - Google Patents

Chaudière avec appareil de dénitrification Download PDF

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Publication number
EP0753701A1
EP0753701A1 EP96110432A EP96110432A EP0753701A1 EP 0753701 A1 EP0753701 A1 EP 0753701A1 EP 96110432 A EP96110432 A EP 96110432A EP 96110432 A EP96110432 A EP 96110432A EP 0753701 A1 EP0753701 A1 EP 0753701A1
Authority
EP
European Patent Office
Prior art keywords
economizer
temperature
denitrification apparatus
boiler
low temperature
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.)
Granted
Application number
EP96110432A
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German (de)
English (en)
Other versions
EP0753701B1 (fr
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
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Mitsubishi Heavy Industries Ltd
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Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Publication of EP0753701A1 publication Critical patent/EP0753701A1/fr
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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 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.
  • 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 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.
  • 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.
  • FIG. 1 A first preferred embodiment according to the present invention is described with reference to Fig. 1.
  • This preferred embodiment 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.
  • a second preferred embodiment according to 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.
  • 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.
  • a third 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.
  • a fourth 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 preferred embodiment according to the present invention, and a low temperature economizer 7 and a low temperature economizer by-pass duct 18 having a flow regulating damper 19, as in said third 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)
  • Treating Waste Gases (AREA)
  • Chimneys And Flues (AREA)
  • Air Supply (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
EP19960110432 1995-07-12 1996-06-27 Chaudière avec appareil de dénitrification Expired - Lifetime EP0753701B1 (fr)

Applications Claiming Priority (3)

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

Publications (2)

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

Family

ID=16006936

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960110432 Expired - Lifetime EP0753701B1 (fr) 1995-07-12 1996-06-27 Chaudière avec appareil de dénitrification

Country Status (4)

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

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001001040A1 (fr) * 1999-06-24 2001-01-04 Siemens Aktiengesellschaft Generateur de vapeur chauffe par combustible fossile et pourvu d'un dispositif de deazotage pour le gaz de chauffage
EP1820560A1 (fr) 2006-02-16 2007-08-22 Siemens Aktiengesellschaft Chaudière avec revêtement catalytique des surfaces d'échangeur de chaleur pour la diminution des gaz polluants
WO2012120417A1 (fr) 2011-03-04 2012-09-13 Foster Wheeler North America Corp. Procédé et appareil destinés à une réduction de nox catalytique sélective dans une chaudière de production d'énergie
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
EP2786795A1 (fr) * 2013-04-05 2014-10-08 Babcock-Hitachi Kabushiki Kaisha Système de dénitration
EP3001102A1 (fr) * 2014-09-26 2016-03-30 Stork Thermeq B.V. Unité de récupération de chaleur et centrale électrique
US9927117B2 (en) 2013-05-23 2018-03-27 Electric Power Development Co., Ltd. Fossil-fuel power plant and fossil-fuel power plant operation method
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

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2844372B1 (fr) 2012-06-27 2016-06-29 Siemens Aktiengesellschaft Dispositif d'épuration de gaz de combustion et procédé de réduction des oxydes d'azote issus des gaz de combustion d'une centrale électrique fonctionnant avec un combustible fossile
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
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
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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2360045A1 (fr) * 1976-07-27 1978-02-24 Hitachi Shipbuilding Eng Co Chaudiere comportant un appareil de denitration
GB2082085A (en) * 1980-08-20 1982-03-03 Westinghouse Electric Corp Apparatus for removing nox and for providing better plant efficiency in simple cycle combustion turbine plants
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

Family Cites Families (2)

* 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
JPS6283057A (ja) * 1985-10-09 1987-04-16 Mitsubishi Heavy Ind Ltd 集塵装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2360045A1 (fr) * 1976-07-27 1978-02-24 Hitachi Shipbuilding Eng Co Chaudiere comportant un appareil de denitration
GB2082085A (en) * 1980-08-20 1982-03-03 Westinghouse Electric Corp Apparatus for removing nox and for providing better plant efficiency in simple cycle combustion turbine plants
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 (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6536380B1 (en) 1999-06-24 2003-03-25 Siemens Aktiengesellschaft Fossil-fuel heated steam generator, comprising dentrification device for heating gas
WO2001001040A1 (fr) * 1999-06-24 2001-01-04 Siemens Aktiengesellschaft Generateur de vapeur chauffe par combustible fossile et pourvu d'un dispositif de deazotage pour le gaz de chauffage
EP1820560A1 (fr) 2006-02-16 2007-08-22 Siemens Aktiengesellschaft Chaudière avec revêtement catalytique des surfaces d'échangeur de chaleur pour la diminution des gaz polluants
WO2007093453A2 (fr) * 2006-02-16 2007-08-23 Siemens Aktiengesellschaft Générateur de vapeur
WO2007093453A3 (fr) * 2006-02-16 2007-10-25 Siemens Ag Générateur de vapeur
WO2012120417A1 (fr) 2011-03-04 2012-09-13 Foster Wheeler North America Corp. Procédé et appareil destinés à une réduction de nox catalytique sélective dans une chaudière de production d'énergie
EP2786795A1 (fr) * 2013-04-05 2014-10-08 Babcock-Hitachi Kabushiki Kaisha Système de dénitration
US9927117B2 (en) 2013-05-23 2018-03-27 Electric Power Development Co., Ltd. Fossil-fuel power plant and fossil-fuel power plant operation method
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
WO2016046305A1 (fr) * 2014-09-26 2016-03-31 Stork Thermeq B.V. Unité de récupération de chaleur et centrale électrique
EP3001102A1 (fr) * 2014-09-26 2016-03-30 Stork Thermeq B.V. Unité de récupération de chaleur et centrale électrique
EA032655B1 (ru) * 2014-09-26 2019-06-28 Сторк Термек Б.В. Теплоутилизационная установка и электростанция
US10570823B2 (en) 2014-09-26 2020-02-25 Stork Thermeq B.V. Heat recovery unit and power plant
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

Also Published As

Publication number Publication date
CA2179002A1 (fr) 1997-01-13
EP0753701B1 (fr) 1999-09-01
JPH0926105A (ja) 1997-01-28
DE69604027T2 (de) 2000-02-24
DE69604027D1 (de) 1999-10-07

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