WO1997031222A1 - Procede de production de vapeur surchauffee destinee a une centrale thermique a vapeur - Google Patents

Procede de production de vapeur surchauffee destinee a une centrale thermique a vapeur Download PDF

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Publication number
WO1997031222A1
WO1997031222A1 PCT/EP1997/000740 EP9700740W WO9731222A1 WO 1997031222 A1 WO1997031222 A1 WO 1997031222A1 EP 9700740 W EP9700740 W EP 9700740W WO 9731222 A1 WO9731222 A1 WO 9731222A1
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WO
WIPO (PCT)
Prior art keywords
lignite
steam
flue gases
heat
process steam
Prior art date
Application number
PCT/EP1997/000740
Other languages
German (de)
English (en)
Inventor
Karl Strauss
Original Assignee
Karl Strauss
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 Karl Strauss filed Critical Karl Strauss
Priority to AU17910/97A priority Critical patent/AU1791097A/en
Publication of WO1997031222A1 publication Critical patent/WO1997031222A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10F—DRYING OR WORKING-UP OF PEAT
    • C10F5/00—Drying or de-watering peat
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L9/00—Treating solid fuels to improve their combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
    • F23K1/04—Heating fuel prior to delivery to combustion apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B7/00—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00

Definitions

  • the invention relates to a method for generating superheated steam for operating a steam power plant by burning brown coal in a furnace of a power plant boiler and discharging the flue gases using their heat.
  • the object of the invention is therefore to continue to use the heat contained in the flue gases in order to improve the utilization of the lignite.
  • this is done in that the flue gases generate process steam via a heat exchanger following the power plant boiler, which is fed to a lignite bed which is exposed to a mechanically applied initial surface pressure at which the process steam heats the lignite under condensation, then without further process steam supply the area pressure is increased to at least 2.0 MPa so that the water contained in the heated lignite is pressed out ...
  • the method characterized above is based on a method for reducing the water content of water-containing, granular brown coal, as described in patent application PCT / EP95 / 03814.
  • This method boils down to the fact that the lignite is exposed to a mechanically applied initial surface pressure which is below the maximum surface pressure occurring in the process and in which thermal energy is supplied to the lignite by steam, which heats the lignite under condensation, and thereafter without further Water vapor supply the surface pressure is increased to at least 2.0 MPa that the water contained in the heated lignite is pressed out.
  • the lignite can be preheated by waste heat before the steam is supplied and the hot water pressed out of the lignite in the process can be used as the waste heat source.
  • the dewatering method described in the patent application PCT / EP95 / 03814 requires water vapor, the thermal energy of which is supplied to the lignite, which heats up with condensation of the water vapor.
  • the generation of water vapor which is referred to as process steam in the context of the present invention, can be integrated in an advantageous and efficiency-improving manner into the method for generating superheated steam for operating a steam power plant by burning brown coal, which is dealt with here, by namely the process steam generated via the heat exchanger by means of the flue gases is fed to the lignite coal at an initial surface pressure, so that no special energy source is required for this heating of the lignite coal bed.
  • the water contained therein is pressed out and can be used as a waste heat source.
  • This is expediently carried out in such a way that the lignite is preheated by waste heat before the process steam is supplied and the hot water squeezed out of the lignite is used as the waste heat source, which is fed directly to the bedded lignite with uniform application and pressed through the lignite becomes.
  • the efficiency of the process mentioned at the outset, in which coal drainage is an essential step can be further improved.
  • FIG. 1 shows the structure of a system for generating superheated steam for operating a steam power plant
  • FIG. 2 shows a device for dewatering the lignite used to operate the steam power plant; 3 shows the device according to FIG. 2 in the final phase of the brown coal drainage.
  • the system shown in principle in FIG. 1 for generating superheated steam H for operating a steam power plant contains the steam generator D, which consists of the power plant boiler K and the furnace F.
  • the superheated steam H emerges from the steam generator D after it has been overheated in this case, in a conventional manner not shown.
  • the superheated steam H is then used to operate a steam turbine and thus to drive generators, which are illustrated here, since this is the state of the art.
  • Crushed lignite is fed to the furnace F from the mill M, which is fed with this from a plant MTE for dewatering lignite.
  • the mode of operation of this system MTE is discussed in more detail below in connection with FIGS. 2 and 3.
  • the furnace F receives its supply air via the supply air duct ZK, which is routed via the air preheaters LVl and LV2 and which are explained in more detail below.
  • the fan G is switched on in the inlet duct ZK, which ensures the required flow in the inlet air duct ZK.
  • the flue gases flowing out in the steam generator D after the power plant boiler K are discharged via the flue gas duct RK, the heat inherent in the flue gases being utilized in the manner explained below.
  • the flue gases are first passed through the air preheater LVl, which extracts heat from the flue gases and releases it to the supply air, which is fed to the air preheater LVl via the supply air duct ZK.
  • the flue gases are then fed to the process steam generator PD, which contains the two heat exchangers WAl and WA2, after the air preheater LV1.
  • the heat exchanger WAl heats what is led into it Water and converts this into process steam, which after collection in the boiler drum T is used for the drainage system MTE in the manner described below.
  • process water is produced as part of the process taking place, which is fed through line LI to heat exchanger WA2, which heats the process water, after which it then enters boiler drum T in order to process, as described above ⁇ steam to be converted.
  • the dust filter SF which removes dust from the flue gases, is also switched on in the flue gas duct RK. Finally, the flue gases are passed through the air preheater LV2, which continues to extract heat from the flue gases and transfers this to the supply air routed in the supply air duct ZK. The flue gases have then cooled down to approx. 120 ° C and can be fed into a chimney.
  • the process steam provided in the boiler drum T is fed via line L2 to the drainage system MTE and is brought to effect there, for which purpose reference is now made to FIGS. 2 and 3.
  • the drainage system MTE shown in Fig. 1 consists of a mechanical structure with a plate press and lines for the guidance of process steam HD and hot water HW.
  • the plate press will be explained in more detail below.
  • FIG. 2 shows a plate press with the press base 9 and the press ram 10.
  • the press base 9 rests on supports 11 and 12 shown here only in principle.
  • the press ram 10 hangs on the ram 13, which is suspended by a press mechanism (not shown here) -and deported becomes.
  • a press mechanism not shown here
  • the press pad 9 is here trough-shaped, so that the lignite 14 can be applied in a bed-like area distribution.
  • the press base 9 is provided with water outlets 15 and the press ram 10 with supply openings 21, so that hot water HW and process steam HD are supplied to the lignite 14 in the closed plate press shown in FIG. 2 via the supply openings 21 and escaping water is discharged via the water outlets 15 can.
  • the water outlets 15 are connected via the dash-dotted lines channels 17 in the press base 9 to a collection outlet, not shown, through which the squeezed water can flow off.
  • the hot water HW and the process steam HD are supplied via the supply openings 21, which are connected to one another by the channels 18 in the press ram 10 indicated by dash-dotted lines.
  • the hot water HW and process steam HD are supplied to the system of the channels 18 and the supply openings 21 via the connected feed line 23, which leads to the container 24.
  • Process water HD is supplied to the container 24 via the supply line 25 hot water HW and the supply line 26, the valves 27 and 28 ensuring that the supply of hot water HW and process steam HD is carried out in the correct rhythm, the required amount and the correct sequence he follows.
  • the valve 29 is inserted, with which the supply of hot water HW and process steam HD can be shut off.
  • the plate press is in a state in which the press ram 10 exposes the lignite bed 14 to an initial surface pressure, wherein, as can be seen, the plate press with its press ram 10 and its press base 9 is just closed.
  • the valve 29 is opened, which then allows hot water HW previously introduced into the container 24 to flow out and supplies it to the supply openings 21 via the system of the channels 18.
  • a pressure exerted by the process steam HD acts on the hot water HW indicated by the line 30 in the tank 24, which continues when the valve 28 is open via the feed line 26 into the tank 24.
  • the hot water HW is evenly fed from the container 24 via the feed line 23 and the feed openings 21 to the lignite bed 14 and pressed through the lignite, the hot water running out via the outlets 15. This pressing of the hot water continues until the water supply in the container 24 has been exhausted, whereupon immediately afterwards the process steam HD now flows through the lignite and heats it in the desired manner by condensation.
  • the further supply of process steam is blocked by means of the valve 29, whereupon the surface pressure in the plate press is increased to at least 2.0 MPa.
  • FIG. 3 This operating phase is shown in FIG. 3, in which the press ram 10 is still lowered compared to its position shown in FIG. 2 and thereby squeezes out the water contained in the brown coal while compressing the brown coal bed 14.
  • the squeezed water which has a temperature corresponding to the heated coal bed 14, is then used in the manner described above as a waste heat source and supplied as hot water via the feed line 25 to the container 24.
  • the process of dewatering the lignite bed 14 is thus ended, so that the lignite can be removed from the subsequently opened plate press and fed to the furnace F via the mill M.
  • the hot water forming a waste heat source is used directly for the preheating of the lignite caused by the hot water, which occurs automatically when the water contained in the lignite is pressed out after the process steam has been supplied and is therefore fully utilized in terms of its energy content.
  • the dewatering of the lignite by means of the MTE dewatering system fits organically into the system for generating superheated steam for operating a steam power plant shown in FIG. 1, since the heat contained in the flue gases is so great that it While the process of lignite dewatering in the MTE plant is used, the flue gases are released at a temperature (as stated above, approx. 100 ° C) at which further heat removal would be uneconomical, quite apart from the fact that for the Feeding the flue gases to a chimney also requires a certain minimum heat.
  • the arrangement of the heat exchanger WAl and WA2 in the flow direction of the flue gases through the flue gas channel RK behind the air preheater LVL causes the steam generator D of about 400 ° C flue gases leaving are cooled to a level in the order of magnitude of 200 C C, where there is a favorable temperature level for generating the process steam by means of the heat exchanger WAl, since the process steam is not hot steam.
  • this temperature range there is no particular sensitivity to be observed for the heat transfer in the heat exchanger WAl, so that no special regulation is required at this point with which the heat transfer is somehow controlled.
  • the flue gases arriving at the heat exchanger WAl with their temperature in the order of magnitude of 200 ° C each offer a sufficient amount of heat even with a stronger or weaker flue gas flow in order to reliably generate the required process steam.
  • the removal of heat from the flue gases by the heat exchangers WAl and WA2 is also advantageous because without this heat removal, the flue gases would leave the system at an excessively high temperature, which is undesirable because of the efficiency of the overall system.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

Abstract

L'invention concerne un procédé de production de vapeur surchauffée (H) destinée à une centrale thermique à vapeur, par combustion de lignite dans un foyer (F) d'une chaudière (K) de la centrale et à évacuer les fumées en utilisant leur chaleur. Les fumées produisent, par l'intermédiaire d'un échangeur de chaleur (PD, WA, WA1) placé en aval de la chaudière de la centrale, de la vapeur de processus industriel qui est acheminée à un lit de lignite (MTE) soumis à une pression superficielle initiale appliquée par voie mécanique. Cette vapeur de processus industriel réchauffe le lignite en se condensant. Ensuite, ledit procédé consiste, sans apport supplémentaire de vapeur de processus industriel, à augmenter la pression superficielle pour la faire passer à au moins 2,0 MPa de façon à faire sortir l'eau contenue dans le lignite réchauffé, puis le lignite ainsi déshydraté est acheminé au foyer de la chaudière de la centrale.
PCT/EP1997/000740 1996-02-20 1997-02-17 Procede de production de vapeur surchauffee destinee a une centrale thermique a vapeur WO1997031222A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU17910/97A AU1791097A (en) 1996-02-20 1997-02-17 Process for generating superheated steam for operating a steam power station

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1996106153 DE19606153C2 (de) 1996-02-20 1996-02-20 Verfahren zur Erzeugung von Heißdampf zum Betreiben eines Dampfkraftwerkes
DE19606153.9 1996-02-20

Publications (1)

Publication Number Publication Date
WO1997031222A1 true WO1997031222A1 (fr) 1997-08-28

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PCT/EP1997/000740 WO1997031222A1 (fr) 1996-02-20 1997-02-17 Procede de production de vapeur surchauffee destinee a une centrale thermique a vapeur

Country Status (3)

Country Link
AU (1) AU1791097A (fr)
DE (1) DE19606153C2 (fr)
WO (1) WO1997031222A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19606238A1 (de) * 1996-02-20 1997-08-21 Dieffenbacher Gmbh Maschf Vorrichtung zur Reduzierung des Wassergehaltes von wasserhaltiger Braunkohle

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4290269A (en) * 1979-10-09 1981-09-22 Modo-Chemetics Ab Process for the efficient conversion of water-containing organic materials as fuels into energy
US4702745A (en) * 1985-05-02 1987-10-27 Kawasaki Jukogyo Kabushiki Kaisha Process for dewatering high moisture, porous organic solid
WO1990000219A1 (fr) * 1988-06-30 1990-01-11 Imatran Voima Oy Centrale electrique a turbine a gaz et a turbine a vapeur combinees et procede d'utilisation de l'energie thermique du combustible destine a ameliorer l'efficacite globale du fonctionnement de la centrale electrique
DE4228206A1 (de) * 1992-08-28 1994-03-03 Steag Ag Gasturbinenanlage und Verfahren zu ihrem Betreiben
WO1996010064A1 (fr) * 1994-09-27 1996-04-04 Karl Strauss Procede et dispositif permettant de reduire la teneur en eau de lignite contenant de l'eau

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4290269A (en) * 1979-10-09 1981-09-22 Modo-Chemetics Ab Process for the efficient conversion of water-containing organic materials as fuels into energy
US4702745A (en) * 1985-05-02 1987-10-27 Kawasaki Jukogyo Kabushiki Kaisha Process for dewatering high moisture, porous organic solid
WO1990000219A1 (fr) * 1988-06-30 1990-01-11 Imatran Voima Oy Centrale electrique a turbine a gaz et a turbine a vapeur combinees et procede d'utilisation de l'energie thermique du combustible destine a ameliorer l'efficacite globale du fonctionnement de la centrale electrique
DE4228206A1 (de) * 1992-08-28 1994-03-03 Steag Ag Gasturbinenanlage und Verfahren zu ihrem Betreiben
WO1996010064A1 (fr) * 1994-09-27 1996-04-04 Karl Strauss Procede et dispositif permettant de reduire la teneur en eau de lignite contenant de l'eau

Also Published As

Publication number Publication date
DE19606153A1 (de) 1997-08-21
DE19606153C2 (de) 2003-04-03
AU1791097A (en) 1997-09-10

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