DD210958A1 - METHOD FOR OPERATING A SEPARATOR BUNKER SYSTEM FOR OBTAINING GOOD CARBON STEAM - Google Patents

Abstract

The invention relates to a method for operating a separator bunker system for recovering zuendfaehigem coal dust, wherein from the mill system of a steam generator, a pulverized coal-air mixture in the separator bunker system and / or zuendfaehiger coal dust is conveyed into a separator with central bunker , To avoid high expenses for the utilization of the fine dust-air mixture from the separator this process is to be promoted. This is achieved in that, according to the invention, the fine dust / exhaust air mixture is controllably extracted by the air and / or exhaust system of the steam generator.

Description

Title of the invention

Method of operating a separator bunker system for the recovery of flammable coal dust

Field of application of the invention

The invention relates to a method for operating a separator bunker -Syst ems for the extraction of flammable coal dust, wherein conveyed from the mill system of the steam generator, a coal dust-air mixture in the separator bunker system and funded from the separator fine dust exhaust air Mixture is used for combustion purposes »

Characteristic of the known technical solutions

The extracted from the coupled with the mill system separator bunker system fine dust-exhaust mixture is promoted using considerable amounts of conveying air as exhaust air with low dust loads back into the steam generator. The fine dust-exhaust mixture passes through the suction of the mill in the flue gas suction. This has the disadvantage that thus the sucked back amount of hot flue gases and thus the maximum fuel load of the mill is reduced.

Furthermore, it is known that the fine dust-exhaust air mixture is sucked by a fan. For this purpose, however, an additional fan in each case to reinstall. In the case of central pulverized coal separation plants and transport between pulverized coal bunkers inside or outside the boiler house, a long conveying path for the concentrated dust conveying gas mixture to the separator and for the fine dust / exhaust air mixture downstream of the separator and thus additional

bubble or compressed air required.

When using the fine dust-air mixture for heating the secondary air, the combustion of dust grate and / or to maintain the Wärmeentbindungsprozesses in cement production considerable expenses for additional delivery lines and blowers are required.

In the known solutions, the plant engineering effort is in an unfavorable ratio to the efficiency of the combustion technology use of the fine dust-exhaust mixture from the separator bunker system ·

Object of the invention

The aim of the invention is .is to use the fine dust-exhaust mixture with simple means and little effort ·

Explanation of the essence of the invention

The invention has for its object to promote the fine dust-exhaust mixture due to the process.

This is achieved in that, according to the invention, the fine dust / exhaust air mixture is controllably extracted by the air and / or exhaust system of the steam generator.

embodiment

In one embodiment, the invention is explained in detail. The drawing shows:

Fig. 1! the integration of the particulate matter exhaust air mixture into the fish air and / or exhaust system of the steam generator,

2 s the integration of the fine dust-exhaust air mixture in the fresh air and hot air system of the steam generator,

Fig. 3 * the integration of the particulate matter-exhaust air mixture in the fresh air line of the pilot burner.

1):

At the steam generator 1, the system mill 2, pulverized coal burner 3 with hot air boxes 4 and 5 Rauchgasrücksaugung is arranged. The exhaust gases pass through the exhaust duct 6 from the dom boiler house 7

via air preheater 8 to the exhaust duct 9 »electrostatic precipitator 10, induced draft 11 and the chimney. About flap 12 and channel 13 is connected to the mill system 2 of the separator 14 (cyclone), the exhaust duct 15 with flap 16 (or slide, or pipe switch) in the exhaust duct 9 and the Frischluftansaugleitung 17 of the fresh ventilator 8 is integrated. Exhaust duct 15 and fresh air intake 17 are with sliders 19.1; 19.2 lockable.

The., Hot air box 4 is connected via hot air line 20 and 8 air preheater with the fan 18. Under the separator 14 · is a bunker 21 with dust extraction devices 22; 23 arranged to the pilot burner and the neighboring bunker. If dust is to be deposited in the bunker 21, the effect is as follows:

The mill system 2 is in operation, the slide 18 is opened, the flap 16 is closed to Frischluftansaugleitung 17 and the flap 12 is opened. The vacuum generated by the induced draft 11 in the exhaust duct 9 leads to the extraction of conveying gas-dust mixture to mill 2 via flap 12 and channel 13 · The dust is deposited in the separator 14 »bunkered in bunker 21 and can be reused via the withdrawal device 22 $ 23. The exhaust gas of the dust collector 14 is discharged via the exhaust duct 151 electrostatic precipitator 10 and induced draft 11 to the chimney. With good separation in the separator 14, the open flap 16 and the closed slide 19.1, the exhaust gas with the fresh air can be sucked together by the fan and conveyed back into the steam generator via the air system.

It is also readily possible, the exhaust passage 41 of the separator bunker system 14; 21 in the region of the induced draft 11 after the electrostatic precipitator 10 to use, so as to use the negative pressure of the induced draft 11 for the dust transport and dust separation in the separator 14.

(Figure 2):

The cyclone 14 with bunker 21 is arranged on the mill system 2 in the boiler house 7 and the exhaust duct I5 is connected via fan 24, exhaust duct 25 and slide 26 with the hot air duct 20. The bunker 21 is by means of screw conveyor 27 with

Preßluftanschlaß 28 and dust duct 29 connected to the cyclone 30, the exhaust passage 31 and the flap 16 with the Frischluftansaugleitung 17. The central bunker 32 is located below the cyclone 30 and coupled to the dust extractor 33 * The operation is as follows:

When the mill system 2 is in operation with open flap 12 and in-service fan 24 conveying gas-dust mixture to the cyclone 14- sucked, dust deposited in the bunker 21 and the exhaust gas via exhaust duct 15ι fan 24 and exhaust duct 25, with open slide 26 on the hot air duct 20 and the hot air burner box 4 is blown into the steam generator 1 "If dust is to be deposited in the central bunker 32, then the screw conveyor 27 with air supply 28 and withdrawal device 23 must go into operation. While conveyed air-dust mixture via dust channel 29 to the cyclone, dust is deposited in the central bunker 32, the exhaust gas is exhausted via channel .31 from the cyclone 30 with open flap 16 and operating fan 18. But it is also possible to integrate the exhaust duct 25 in the air system 20 before, in or after air preheater 28, if short channel lengths require it. For the same reasons, the channel 31 with the flap 16 at any point of the air system 20 after fresh air fan 18 is to be integrated, when compressed air delivery of the screw conveyor 27, the corresponding overpressure in the channel 31 relative to the air system 20 is present. In the other case, an additional fan must be interposed.

(Figure 3)?

The channel 15 is integrated into the suction line 36 of the fresh ventilator and shut off via the flap 37. The fresh ventilator 35 supplies the oil burner 34 with cold combustion air.

The mode of action when starting up is as follows: The oil burner 34 with fresh ventilator 35 is put into operation. The flap 37 closes the channel 15. After a start-up and preheating time, when the slide 40 is closed, dust pre-bunkered from the bunker 21 to the pulverized coal ignition burner 38 via the discharge device 22 is conveyed via the dust line 39.

sucked and ignited. Then mill 2 is put into operation. At the same time, the flaps 12j 37 are opened. "Thus, the fan 35 partially sucks fresh air from duct 36 and conveying gases from the mill via duct 13, separator 14 with dust separation into bunker 21 and exhaust duct 15 and blows both mixed on the oil burner 34 in operation into the steam generator on.

Wake a stabilization time, the oil supply to the oil burner 34 is closed, the air intake 36 closed with flap 37. Thus, the entire suction power of the fan 35 is used for increased extraction of conveying gas-dust mixture from the mill system 2 for increased dust separation in the separator 14 and the oil burner used as Einblaseöffnung the exhaust gases and cooled simultaneously with the exhaust gases. There are more combinations possible. For example, the fan 35 is partially or completely integrated into the dust ignition burner 38. The channel 13 is also to be connected via a connecting line in a mill system or a bunker of the neighboring steam generator or a central dust conveying gas line, so that foreign dust is to be sucked.

The invention achieves the following advantages:

1. There are additional blowers to promote the exhaust gases saved.

2. The exhaust pipe after cyclone can be shortened when integrated into the exhaust gas or air system ·

3. The air injection openings of the ignition or support burners are used for exhaust gas discharge into the steam generator and the burners are cooled. This saves cold air for cooling and increases the thermal efficiency of the process.

4 · T / heat-technical use of fine dust for combustion ·

Claims (5)

invention claim A method for operating a separator bunker system for the production of flammable coal dust, wherein from the mill system of a steam generator, a pulverized coal-air mixture in the separator bunker system and / or combustible pulverized coal is conveyed into a separator with central bunker the particulate matter-exhaust air mixture from the separator is used for combustion purposes, characterized in that the fine dust-exhaust air mixture from the air and / or exhaust system of the steam generator is controllably sucked · 2, method according to item 1, characterized in that the fine dust-exhaust mixture is controllably sucked into the Frischluftansaugleitung of fresh air and / or in the exhaust pipe before induced draft or electrostatic precipitator of the steam generator. 3 · Method according to item 1, characterized in that the fine dust-exhaust mixture is controllably sucked before, in or after the air preheater in the air system. 4 »method according to item 1, characterized in that the fine dust-exhaust air mixture is controllably sucked into the fresh air line of the pilot burner of the steam generator · 5. The method according to item 1, characterized in that the fine dust-exhaust mixture is controllably sucked into the hot air duct before the main burner of the steam generator. For this 3 sheets of drawings