DD157115A1 - METHOD AND ARRANGEMENT FOR ACCESSING A CARBON STEAM GENERATOR - Google Patents

Abstract

The invention relates to a method for starting a pulverized coal-fired steam generator, wherein the heat generated during the starting process is to be used for the starting process for the treatment of the fuels and for the operation of the burner system. This is achieved by the fact that according to the invention in the case of out of operation Saugzuganlage the steam generator to be fed, the flue gases of the starting process in a steam generator in operation are promoted by a mill in operation, the steam generator to be approached and the steam generator in operation are connected via controllable connection lines.

Description

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Title of the invention

Method and arrangement for starting a pulverized coal-fired steam generator

Field of application of the invention

The invention relates to a method and an arrangement for starting up a pulverized coal-fired steam generator «

Characteristic of the known technical solutions

The startup of a coal dust-fired steam generator is such that the combustion chamber of the steam generator via a pulverized coal pilot burner system, via a gas or oil-fired pilot burner system, rust-based pilot burner system and / or foreign heat input (hot air, flue gases, electric energy) on the for Heating the coal dust Xuft mixture required temperature, then put the 'pulverized coal firing' in operation and with stable combustion the ignition aids are discontinued *

However, the known measures and solutions have a number of disadvantages, so that a realization has not been done so * It is necessary

- pulverized coal fired pilot burner systems (DR-PS 755 552, 743 684, 746 929, 926 024 ». 923 213, DB-OS 2806 363, DD-PS 120 533, DD-PS ♦. * ...

-WP P 23 C / 222 330 and DD-PS »- WP F 23 C / 225 138) special

Expenses for the preparation, drying and ignition of coal dust}; "

- Gas or oil-fired pilot burner systems (DD-PS 120 920, 90 600, DE-OS 2854 218, 2358 589) hoohv / ertiger primary energy sources, z ». B · in the order of 30 t to 50 t of fuel oil per starting process ;

- Foreign currency feed (DR PS 479 432, DD-PS '143 816, 7 637, DiJ-OS 2816 674) further additional preheating and / or high expenses for wear repairs;

- rust-supported 'ignition burner systems (DD-PS 127 937 »DE-AS 1067 558, 1044 336, DS-PS 879 751, DS-OS 1948 1? 4) high system requirements and separate feeds,

  Furthermore, it is known for a pulverized coal fired steam generator during the startup process not to take the Saugzuganlage into operation, but to allow a minimum train and drive with low Heizöleinsatζ (DD-PS 119 461) · This solution, however, still requires a Heizöleinsatz, by the use of coal dust-fired pilot burners However, to replace is to save fuel oil »

Object of the invention

The aim of the invention is to use the heat generated during the startup process ₀

Explanation of the essence of the invention

The object of the invention is to utilize the heat arising during the starting process for the starting process, for the preparation of the fuel and for the operation of the burner system.

This is achieved in that, according to the invention, when the steam generator of the steam generator to be operated is out of operation, the flue gases of the starting process are conveyed to a steam generator in operation by a mill in operation, the flue gases being removed by an operating mill For the realization, the steam generator to be approached and the steam generator in operation are connected via controllable connection lines. , ·

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embodiment

On an exemplary embodiment, the invention is explained in more detail. Drawing shows the circuit of a steam generator to be approached 'with closed exhaust and suction zuganlage.

227 1 2

The steam generator 1B to be approached has the pulverized coal mills 2.1; 2.2; 2.3 »2 # 4j the smoke extractors 3 _t the feeders 4, the dust ducts 5 nit slide 6 and flaps 7 and the pulverized coal main burner system 8. For this purpose, the pilot burner system 9 with separator bunker system 10, which is arranged directly above the grate 11 arranged auxiliary burner system 12. The auxiliary sbrenner plant '12 is connected via the line 13 with slide 16 in. The dust channel 5 to mill 2 * 1 and before slide 6 »In the dust channel 5 of the mill 2e4 the line 15 is integrated with flap 7, the separator Bunker system, 10 leads. A connecting line 19 connects the dust channel 5 of the cooling 2.4 of the steam generator 1B with the dust channel 5 before flap 7 of the mill 2.4 of the steam generator 1A. The steam generator 1A in operation has the pulverized coal mills 2.1} 2.2j 2 * 3 »2o4 ,. the flue gas recirculation 3 _f the allocator 4 »the dust channels 5 with slide 6 and flaps 7 and the -Kohlenstaub-main burner systems 8 on. In the combustion chamber of the steam generator 1A, the grate 11 is arranged. In the dust channel 5 of the mill 2.2 of the steam generator 1Δ 2.2 and before flap 7, the connecting line 17 is involved after mill. This is further integrated into the dust channel 5 of the mill 2 · 2 before the main pulverized coal burner 9 of the steam generator 1B »In the dust channel 5 of the mill 2" 3 of the steam generator 1A, the connecting line 18 is incorporated after cooling 2 _e 3 and slide 6 « This is further incorporated in the dust channel 5 of the mill 2.3 of the steam generator 1B mill 2 * 3 and before flap 7. The connecting lines 17 - 19 are designed lockable.

The approximation is the following ^

The steam generator 1A is in operation and the steam generator 1B is to be put into operation. In this case, the mill 2 _e 3 of the steam generator 1A is taken out of service and the slide 6 geschuossen. The mill 2 »3 of the steam generator 1B is put into operation and the flap 7 is closed. The induced draft system of the steam generator IB is not put into operation. By these measures, the combustion chamber of the steam generator 1B via flue gas Rücksaugung 3 »Mill 2.3 and compound line 18 connected to the combustion chamber of the steam generator 1A, so that resulting flue gases from the combustion chamber of the steam generator 1B in the combustion chamber and Saugzuganlage the steam generator 1A»

For preheating the Bx'eiinkainsQr the steam generator 1B, the connecting line 17 is put into operation by the slide 6 in the dust channel 5 of the cooling © 2.2 of the steam generator 1B ιιηά the flap 7 in the dust channel 5 of the mill 2 * 2'des the steam generator 1A is concluded », the flue gases from the Brennlcasunex · of the steam generator 1A through the mill 2 * 2 in the compound they promote tion 17" and the dust channel 5 of the mill 2.2 of the steam generator 1B and the coal dust Hauptbrehner system 8B blown into the combustion chamber »The steam generator 1B is further preheated by putting the ignition burner ~ plant 9 into operation«. In this case, the pulverized coal dusted up in the bunker separator system 10 is used or coal dust is obtained by putting the connecting pipe into operation "The commissioning of the connecting line 19 is carried out so daJ3 the slide 6 and the flap 7 in Staubkejial 5 of the mill 2» 4- of the steam generator 1B is closed wi Rd and thus the connecting line 19 is integrated in dae separator banker system 10 The connecting line 19 is incorporated into the dust channel 5 of the operating mill 2.4 of the 'steam generator 1A, so that when the flap 7 closed the coal dust-air-Gerüisch the mill 2 * '4 of the steam generator 1A is conveyed into the pilot burner system 9 j 10 of the steam generator 1B »The carbon dust obtained therefrom deposits on the grate 11, is ignited and forms an ignition layer. Thereafter, the slider 6 is closed in the dust channel 5 of the mill 2 " \ steam generator 1B and opened the slide 16 in the line 13 and the mill 2, T with · allocator 4 into operation

Thereafter, undried wet but crushed Ronbraunk coal is conveyed, deposited, dried and ignited via the line 13 and auxiliary burner system 12 to the ignition layer of the grate 11. After stable ignition of the moist coal dust on the grate 11, the pilot burner system is installed. 9 and auxiliary burner system 12 taken out of service, so that upon reaching the ignition temperature in the combustion chamber of the steam generator 1B, the mill 2c3 * ait allocators 4 of the steam generator 1B step by step put into operation and opened the flap 7 in the dust channel and the Verbindun ^ sleitung 18 shut off v / ill. Furthermore, the mills 2.1} 2.4 »the induced draft system of the Daaipferzeuger 1B are put into operation and taken the connecting lines 17 and external operation. This ensures a stable ignition and combustion of the pulverized coal air mixture of the pulverized coal main burner system 9. ν

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During operation of the connector 17; 19 Note that the coal dust-LIühlerij v / Elcho work with the Vex'bindun ^ sleituneen ÄeffioiBseza ,, their permitted Teciperaturbelast bility not exceed "Lying in this Pail the temperatures of the pumped gases too high, Po must start by the arbiter 4 and the associated coal on drying the! Other combined circuits are possible, with the option of disconnecting, coupling or connecting other main connections between main, auxiliary and pilot burner units, pulverized coal recirculation units, separator bunker installations, Koh-, lenstaubkanälen-, combustion chambers. As well as flue gas ducts of KachscbXLtheizflächen and flue systems are replaceable »So ziUQ example-by, that sucked on a, in-service pulverized coal mill and their Rauchgasrüoksaugung from the steam generator to be approached Anfahrgase, in one after Kohlenstaubniühle. integrated connection line, which is involved in the RauchÄasrücksaugung an operating Kohlenstaubniühle a Kachbardarapferzeugero, pressed and sucked from there by means of the integrated pulverized coal mill of the neighboring steam generator and the main burner, combustion chamber and induced draft i n the chimney is promoted.

The invention achieves the following advantages:

1 "The startup process requires lower start-up heat quantities and start-up times, since the flue gases are not conveyed via laachschaltheizf laughter and the exhaust system is preheated,

2t in the exhaust system and in the. Air preheater, occurs during the start-up no hypothermia de * · flue gases with 'their negative poles, z. B. dew point corrosion ,, on *

3 «Deflagrations caused by deposits of non-combustible coal dust in Kachschaltheizflächen and exhaust system are avoided«

4. The "start-up process can be such that during the ignition process of the pulverized coal much Unverbranntes.anfall can, without this causes an energetic loss or danger, since the unburned burned on the grid or in suspension with the flue gases in the Beti" The steam generator is transported and burnt there

Claims (1)

Claim of invention. 1 «method for starting a pulverized coal-fired steam generator, characterized in that when out of service Saugzuganlage the steam generator to be approached, the flue gases of the starting process in an operating steam generator are required by a mill in operation. 2s method according to item 1, characterized in that the flue gases are conveyed by an operating cooling of the to be approached or the operating steam generator * 3β Process according to items 1 and 2, characterized in that the fumes are conveyed into the pulverized coal duct upstream of the pulverized coal main burner in the flue gas recirculation, in the combustion chamber, in the flues of the Hachschaltheizflarej in the induced draft system or in the exhaust system. 4 «method according to item 1, characterized in that the starting process by Fremdv / ariae and / or pulverized coal-air Geniiscb an operating steam generator and / oiev bunkered pulverized coal and / or ground wet coal dust introduced. Method according to item 4, characterized in that the starting process is initiated by means of an ignition, auxiliary and / or pulverized coal main burner plant and / or carbon pulverizer and / or grate. 6 »Device for carrying out the method according to item 1, characterized in that the steam generator to be approached and the steam generator in operation are connected via controllable connection lines. For this / \ ropes drawing;