DD235788A3 - ARRANGEMENT FOR DETERING CARBON DUST FROM A BUNKER - Google Patents

Abstract

It should be possible with the help of a known extraction device direct operation via connecting lines by the pulverized coal from the exhaust devices in one and / or in several directions and / or controlled by other empty exhaust devices to the coal dust consumers, eg. As coal dust main or Zuendbrenner, central bunker and / or emergency emptying devices, should be promoted. This is achieved in that in the end faces of the removal chamber connecting lines are connected to exhaust devices adjacent bunkers and / or Foerderleitungen to Kohlenstaubverbrauchern, with connecting and / or Foerderleitungen expand in the sampling chamber and form an annular gap with an aperture whose annular chambers with lockable Air lines are connected. Fig. 1

Description

For this 2 pages drawings

Field of application of the invention

The invention relates to an arrangement for the extraction of coal dust from a bunker.

Characteristic of the known technical solutions

For the extraction of coal dust from a bunker, a removal chamber is arranged after the bunker slide, in the front side of an intake pipe is integrated for the dust extraction.

This intake extends in the removal chamber and forms an aperture with an annular gap, the annular chamber is connected to a lockable air line. The bunker outlet has a deflector.

This device has proven particularly useful for the removal of wet coal dust in connection with drainage on the slide and on the removal chamber.

This device has proven particularly useful when used in connection with pulverized coal pilot burners on pulverized coal fired steam generators.

To increase operational safety, the individual steam generator-related pilot burner systems consisting of the bunker separator system, the extraction device and the pilot burners are connected to one another via connecting lines.

The bunkers are provided with distributor elements (trouser pieces), hoods, slides, switches and lines that represent a great deal of effort and due to the space still require special training and arrangement.

Object of the invention

The aim of the invention is to provide a structurally and technically easy to implement device.

Explanation of the essence of the invention

The invention has for its object to realize using a known device for the withdrawal of coal dust direct operation via connecting lines, the pulverized coal from the trigger devices in one and / or in multiple directions and / or controlled by other empty exhaust devices adjacent bunker to the coal dust consumers, z. As coal dust main or -Zündbrenner, central bunker and / or emergency emptying devices to be promoted.

This is achieved in that according to the invention in the end faces of the removal chamber connecting lines are connected to exhaust devices of adjacent bunker and / or conveyor lines to Kohlenstaubverbrauchem, extending connecting and / or delivery lines in the removal chamber and form an annular gap with an aperture whose annular chambers with Lockable air lines are connected.

embodiment

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

1: the extraction device in section,

2: the arrangement of extraction devices via connecting lines for the Zündbrenneranlagen in a thermal power plant

In the outlet 1 of the bunker 2 of the bunker slide 3 and the outlet 1, the removal chamber 4 is arranged.

In the end faces 5; 6 of the sampling chamber 4 are the suction lines 7; 8 included, which expand in the sampling chamber 4. Within the removal chamber 4, the aperture 9; 10 disposed with the suction lines 7; 8, the annular gaps 11; 12 form. In the annular chambers 13; 14 are the air ducts 15; 16 involved, the slide 17; 18 have. At the outlet 1 of the bunker 2, the deflectors 19; 20 arranged.

In the removal chamber 4, the intermediate channel 21 is arranged, with the apertures 9; 10 also the annular gaps 11; 12 forms.

-2- 623 35

) The operation is the following:

η a thermal power plant are each a Zündbrenneranlage for the steam generators, consisting of the bunker 2; 2.1, the receiving chamber4; 4.1, the suction lines 7; 8th; 7.1; 8.1 with the check valves 24; 24.1, the pilot burner 22; 22.1 and ler connecting line 23 with the gate valve 25, respectively.

Normally, when the gate valve 25 is closed by opening the respective bunker slide 3; 3.1 and the scraper 17; 17.1 the coal dust from the bunker 2; 2.1 to the pilot burners 22; 22.1 with open check valves! 4; 24.1 funded.

m fault case, z. B. bunker 2.1 disturbed, by opening the bunker slide 3 and the slide 17; 18 the coal dust from learning bunker 2 to the pilot burner 22 and from the bunker 2 via the connecting line 23 with open gate valve 25 and the pilot burner 22.1 promoted.

.u. At the beginning of this process, the extraction chamber 4.1 is emptied by the suction of the burner 22.1. In this mode of operation, the slides 17; 18 opened, the slide 17.1; 18.1 closed, and both non-return valves 24; ! 4.1 open automatically by the suction effect of both burners.

5oll only the pilot burner 22.1 be put into operation and the associated bunker-trigger system is disturbed, z. B. .uftleitung 17.1 disturbed, it is by opening the air valve 18, gate valve 25, the check valve 24.1 and 5unkerschiebers3bei closed slides 17; 18.1 and bunker slide 3.1 the pulverized coal from the bunker 2 is conveyed to the burner 22.1. In this case, the non-return valve 24 closes automatically.

If the pilot burner systems are assigned to adjacent steam generators and if a steam generator is to be started up, O can be conveyed from the bunker 3 to the pilot burner 22.1 by way of the aforementioned switching of the pulverized coal. After the bunker 3 has been emptied, closed gates 18.1; 25 and opened sliders 17.1; 3.1 the coal dust to the pilot burner 22.1 promoted until complete emptying of the bunker 2.1. In the meantime, pulverized coal is again bunkered in the steam generator in operation in 3unker 2, which is returned to the pilot burner 2 after switching back to the bunker 2. ) Amit it is possible to use the bunker capacity of both systems for the pilot burner of the steam generator to be approached, moreover, the pilot burner is 22.1 still any length to keep in operation with reduced dust performance when empty 3unker3, open slides 25; 18 and closed sliders 17; 17.1; 18.1; 3.1 and dust separation in bunker 2 at a mill system of the steam generator in operation pulverized coal with small amounts of conveying gas and air from the .uftleitung 18 is sucked directly to the pilot burner 22.1. In this case, the Staubscheideleistung is still increased by the at the cyclone bunker system (2) acting vacuum from the pilot burner 22.1. This effect is even further improved if, in addition, the air slide 18 is closed.

Depending on the operating mode, the check valves 24 fit; 24.1 the suction effects of the pilot burner 22; 22.1 and prevent Dei explosions resulting from the combustion chamber glowing coal dust on the burner in operation in ^the: gotta ördersystem.

The entire conveyor system is integrated into the lock of the steam generator, so that no danger to personnel can occur. The individual circuits of the valves are controlled by an automatic pre-selection system for bunkers and pilot burners to be put into operation according to the following scheme:

in operation slide, flap

Bunker pilot burner To

2 22 2.1 22 2.1 22.1 2 22.1

18; 25 3; 17; 24 3; 17; 18; 17.1 24; 25; 3.1; 18.1 24.1 18.1; 25 3.1; .17.1; 24.1 3.1; 17; 18.1; 24.1; 25; 3; 18 17.1; 24

While the operation according to the suction principle has been explained so far, the invention is also applicable to the operation according to the pressure principle by either the trigger devices are connected via a connecting line and z. B.

supplying a vortex burner with coal dust or under a bunker two extractors are connected via connecting pipes and supply several vortex burners. In this case, either a fan is provided or each connecting line acted upon by a fan, in each case a deduction device is always passed through with the pulverized coal to be conveyed.

It is also possible to request the coal dust from bunkers, connecting and delivery lines by emergency emptying in case of emergency. In this case, the pulverized coal in the hatch or burner of a neighboring steam generator or to promote the boiler bottom for rinsing.

The invention achieves the following advantages:

1. With several steam generators, the bunkers of the neighboring steam generator can be used (increase of the bunker volume)

2. If there are two consecutive start-up processes (no possibility of bunkering), the steam generator can be approached with dust with the aid of the neighboring bunker system.

3. In mill failure of a steam generator with bunker system is constantly maintained over another steam generator with bunker support operation.

4. In systems with insufficient space to set up several conveyor systems per steam generator, the delivery systems of several steam generators can be used.

5. When the mill or bunker of a steam generator is being repaired, it is possible to remove dust from the installation of another steam generator for starting and supporting the first steam generator.

6. Low system costs for dust cross-connection of several steam generators.

Claims (3)

Invention claim: 1. Arrangement for the extraction of coal dust from a bunker, wherein after the Bunkerschieber a removal chamber is arranged, characterized in that in the end faces of the removal chamber connecting lines are connected to exhaust devices of adjacent bunker and / or delivery lines to Kohlenstaubverbrauchern, wherein connection and / or Extend delivery lines in the removal chamber and each form an annular gap with an orifice whose annular chambers are connected to shut-off air ducts. 2. Arrangement according to item 1, characterized in that an intermediate channel is arranged between the panels in extension of the integrated connection and delivery lines. 3. Arrangement according to item 1, characterized in that provided in the triggering devices with check valves conveyor lines are integrated.