EP0606630B1 - Verfahren zur Ableitung von gereinigten Rauchgasen - Google Patents

Verfahren zur Ableitung von gereinigten Rauchgasen Download PDF

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Publication number
EP0606630B1
EP0606630B1 EP93120660A EP93120660A EP0606630B1 EP 0606630 B1 EP0606630 B1 EP 0606630B1 EP 93120660 A EP93120660 A EP 93120660A EP 93120660 A EP93120660 A EP 93120660A EP 0606630 B1 EP0606630 B1 EP 0606630B1
Authority
EP
European Patent Office
Prior art keywords
gases
clean
gas
chimney
pure
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
EP93120660A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0606630A1 (de
Inventor
Rolf Knief
Detlef Pfullmann
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.)
Uniper Technologies GmbH
Original Assignee
PreussenElektra AG
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 PreussenElektra AG filed Critical PreussenElektra AG
Publication of EP0606630A1 publication Critical patent/EP0606630A1/de
Application granted granted Critical
Publication of EP0606630B1 publication Critical patent/EP0606630B1/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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J13/00—Fittings for chimneys or flues 
    • F23J13/02—Linings; Jackets; Casings

Definitions

  • the invention relates to a method for discharging flue gases (clean gases), cleaned by catalytic denitrification, dedusting and wet desulfurization, of a combustion system, in particular a power plant operated with fossil fuels, into the atmosphere, in which the steam-saturated clean gases after exiting the flue gas desulfurization system by means of a suction fan the chimney fed and heated before entering the fireplace.
  • flue gases clean gases
  • a suction fan the chimney fed and heated before entering the fireplace.
  • the desulfurized and denitrified flue gases are usually reheated before they enter the chimney by a regenerative heat exchanger which is heated with raw gas that has not yet been desulfurized and releases its heat to the desulfurized clean gases.
  • gaseous sulfuric acid contained in the raw gas condenses on the heat transfer surfaces of the regenerative heat exchanger, water and hydrogen fluoride being incorporated.
  • the condensate film of this acid leads not only to severe corrosion on the components and heat transfer surfaces of the regenerative heat exchanger, but also to a precipitation of dust particles on the liquid film that forms on the heat transfer surfaces.
  • Such a circuit arrangement in which the clean gases are heated again via a recuperative gas preheater, is known, for example, from the journal Fuel-Heat-Power, Volume 36 No. 10, October 1984, pages 427 to 431.
  • a clean gas blower can be arranged between the scrubber of a flue gas desulfurization system and the gas preheater.
  • the temperature of the clean gas increases due to the compression work of the fan.
  • this arrangement has the disadvantages described above of the reheating of the clean gases by means of regenerative heat exchangers, namely pressure losses in the area of the heat exchangers and a strong risk of corrosion of the heat transfer surfaces.
  • the invention has for its object to provide a method for discharging clean gases of the type described above, which on the one hand avoids the disadvantages described above when reheating the clean gases by regenerative or recuperative heat exchangers and on the other hand does not cause other emissions or higher immissions.
  • the solution to this problem by the invention is characterized in that during operation the heating of the clean gases takes place by utilizing the polytropic compression work of the induced draft fan arranged between the flue gas desulfurization system and the chimney, that during operation the wall of the clean gas duct between the fan outlet and the chimney outlet is above the temperature of the clean gas is heated and that additional heating of the clean gases takes place only before the entry into the chimney during start-up times and other phases with increased moisture.
  • the clean gas channel wall can be electrically heated according to a further feature of the invention.
  • the process according to the invention has the advantage that the elimination of an expensive heat exchanger, which is susceptible to failure due to corrosion, on the one hand reduces system and maintenance and repair costs, and on the other hand avoids pressure losses caused by the heat exchanger. Eliminating a regenerative heat exchanger also avoids the risk of sulfuric acid, hydrogen fluoride and highly corrosive coarse particles being emitted. Since the induced draft fan must be available for the discharge of the flue gases in any case, required the method according to the invention does not involve the use of an additional component, but merely its arrangement behind the flue gas desulfurization system and the design as a so-called wet fan.
  • the additional heating of the pure gases to be carried out according to the invention only during the start-up times and other phases with increased moisture accumulation can be carried out with the aid of a relatively small heat exchanger of any type, for example a steam-heated air preheater, so that the structural and energy expenditure required for this can be kept low.
  • a relatively small heat exchanger of any type for example a steam-heated air preheater
  • the heating of the clean gas duct wall between the fan outlet and the chimney outlet which takes place according to the invention both during the start-up and shutdown times and during normal operation, requires only a small amount of construction in relation to the heat exchanger which is omitted, in particular if an electric heater is used.
  • the heating output is also low. For example, in a 120 m chimney for a power plant with 500 MW electrical output, it is only 300 kW.
  • the invention provides a method for discharging flue gases cleaned by catalytic denitrification, dedusting and wet desulfurization into the atmosphere which, despite avoiding the disadvantages of the known methods described at the outset compared to these methods, requires less equipment and less energy consumption.
  • FIG. 1 shows a steam generator 1, to which fuel and combustion air heated via an air preheater 2 are fed and the flue gases indicated by an arrow are first fed to a catalytic denoxification plant 3.
  • the flue gases loaded with SO 3 and HF give off part of their heat to the combustion air in the air preheater 2 and are then dedusted in an electrostatic filter 4.
  • a reduction in NO x to 200 mg / m 3 takes place in the denitrification plant 3 ; Dust is removed in the electrostatic filter to approximately 50 mg / m 3 .
  • the denitrified and dedusted flue gas is then fed to a flue gas desulfurization system 5, in which the flue gas is desulfurized to about 400 mg / m 3 by adding lime milk and carrier air in a wet process.
  • the gypsum obtained in the flue gas desulfurization system 5 is drawn off.
  • the flue gas (clean gas) cleaned by catalytic denitrification, dust removal and wet desulfurization is sucked out of the flue gas desulfurization system 5 by a suction fan 6 and fed to the chimney 7 connected downstream.
  • the clean gas duct 8, which runs between the outlet from the induced draft fan 6 and the mouth of the chimney 7, is provided with an electrical heater 9 and also with thermal insulation 10.
  • the induced draft fan 6 is designed such that the clean gases are heated up due to the polytropic compression work of the induced draft fan 6. Since this does not suffice to dry the clean gas as a whole during normal operation of the power plant, ie with the suction fan 6 running, the clean gas duct 8 is heated to a temperature above the clean gas temperature to avoid condensation, for example, by means of an additional heater 11 shown in dashed lines in FIG.
  • the clean gases are discharged through a cooling tower 7a.
  • the temperature and pressure curve are plotted in a diagram. The diagram shows that even without operation of the additional heater 11 shown in broken lines, the induced draft fan 6 causes the temperature of the clean gases to rise from 48 ° C. to 53 ° C. Since the clean gases are discharged into the atmosphere through a cooling tower 7a heated by heat exchange, additional heating of the clean gases in the cooling tower 7a and also additional heating 11 can be dispensed with if the clean gas line between the fan outlet and the cooling tower is not too long.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treating Waste Gases (AREA)
  • Chimneys And Flues (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Sampling And Sample Adjustment (AREA)
EP93120660A 1993-01-09 1993-12-22 Verfahren zur Ableitung von gereinigten Rauchgasen Expired - Lifetime EP0606630B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4300431 1993-01-09
DE4300431A DE4300431C1 (de) 1993-01-09 1993-01-09 Verfahren zur Ableitung von gereinigten Rauchgasen

Publications (2)

Publication Number Publication Date
EP0606630A1 EP0606630A1 (de) 1994-07-20
EP0606630B1 true EP0606630B1 (de) 1996-10-30

Family

ID=6477933

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93120660A Expired - Lifetime EP0606630B1 (de) 1993-01-09 1993-12-22 Verfahren zur Ableitung von gereinigten Rauchgasen

Country Status (6)

Country Link
EP (1) EP0606630B1 (es)
AT (1) ATE144823T1 (es)
DE (2) DE4300431C1 (es)
DK (1) DK0606630T3 (es)
ES (1) ES2094994T3 (es)
GR (1) GR3021734T3 (es)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2738501A1 (de) * 1977-08-26 1979-03-08 Saarberg Hoelter Vorrichtungsanordnung zur entschwefelung von kraftwerksabgasen
SE452413B (sv) * 1984-12-04 1987-11-30 Flaekt Ab Medieblandande dysa, avsedd att utnyttjas i en kontaktreaktor
DE4000654A1 (de) * 1990-01-11 1991-07-25 Schmitz Tona Tonwerke Verfahren zum auskleiden eines schornsteines und manschette zum verbinden der rohrabschnitte eines innenrohres hierfuer
DE4008617A1 (de) * 1990-03-17 1991-09-19 Kraftanlagen Ag Verfahren zum schutz von druckerhoehungsgeblaesen in nachschaltung zur nassentschwefelung von abgasen
DE4124489A1 (de) * 1991-07-24 1993-01-28 Flachglas Consult Gmbh Industrie-schornstein mit saeureschutzeinrichtung
DE4130763A1 (de) * 1991-09-16 1993-03-18 Wurz Dieter Verfahren und vorrichtung zur ableitung von gereinigten rauchgasen

Also Published As

Publication number Publication date
DK0606630T3 (da) 1997-04-14
GR3021734T3 (en) 1997-02-28
EP0606630A1 (de) 1994-07-20
DE59304358D1 (de) 1996-12-05
DE4300431C1 (de) 1994-06-30
ATE144823T1 (de) 1996-11-15
ES2094994T3 (es) 1997-02-01

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