CSD-MIS
FLSmidth A/S Vigerslev Allé 77 · 2500 Valby · Denmark Tel +45 36181000 · Fax +45 36301820 www.flsmidth.com · DK reg.no. 15 02 88 82
21 February 2013
Memo – Installation of air blasters To
Holcim
Copies to
Aleksandra Matuszewska, Michael Simonsen
From
Lars Kuur
Filing Subject line Summary of discussions concerning the installation of air blasters on Narogong plant.
Hello This memo will cover the following topics: • •
•
Summary of the FLS air-blaster design What you at this point in time has informed about your plans for the air-blaster system. Comments to your choices of design
Summary of the FLS air-blaster design
We supply the following: -
5 inlet wall air blasters. 3 grate air blasters in each side. In total 6 A pressure regulator w. various other components (exit tube size ½".) ½" tubing to connect everything from the regulator and onwards. All accessories needed
Also refer to drawing 10294488. The exact firing sequence for your blasters is decided by the commissioning engineer. But an example of the timing is cycle times of 10 to 25 minutes on the grate blasters closest to the kiln and 25 to 50 minutes on the ones furthest from the kiln. You only fire the wall blasters when you have build-ups. Build-ups only happen when you have strong fluctuations in the process. pr ocess. With a stable process the grate blasters should most of the time do the job alone.
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CSD-MIS
FLSmidth A/S Vigerslev Allé 77 · 2500 Valby · Denmark Tel +45 36181000 · Fax +45 36301820 www.flsmidth.com · DK reg.no. 15 02 88 82
What you at this point in time has informed about your plans for the air-blaster system.
You intend to make the following modifications: -
-
-
Install 2 airblasters in each side of the horseshoe (4 in total). I have given you the drawings from our MMC ABC installations where we do the same; I recommend you install them like this. Upgrade 4 of the 5 inlet wall tanks to 200L from 100L Install 2 airblasters above the 5 at the inlet wall Use steel braided high temperature flexible hoses to make the connection to the actual airblasters Install pressure gauges and pressure transducers on all airblasters (except the 2 blast pipes (?)), this will be secured in a cabinet. Not use any pressure regulator. Connect directly to your dedicated compressor system.
Further you have informed me that you will not connect the system to plant air, but rather make a dedicated system. The system consists of the following: -
24.2 Nm^3/min compressor Max pressure 10 bar 4000 L tank on the ground 2000 L tank next to the airblasters
Your intention is then to let the airblaster pressure fluctuate between two set values and use the compressor to top up when necessary. Your system will have a fall-over to plant air in case of compressor failure. Comments to your choices of design
I have informed you that I do not mind you choosing to upgrade the system even though I have informed you that it should not be necessary. But I understand you concern seeing how your new IKN inlet is running. I therefore assist with drawings and suggestions for how we can best implement your upgrades. Your choice not to use a pressure regulator is however not an
upgrade. It is a significant downgrade of your system. You have a compressor that enables you to use up to 10 bars in the system. This you can then regulate to 6 bars. With all your buffer tanks filled with 10 bars you will only have to run the compressor a fraction of the time. To emphasize my point I show the following two graphs:
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CSD-MIS
FLSmidth A/S Vigerslev Allé 77 · 2500 Valby · Denmark Tel +45 36181000 · Fax +45 36301820 www.flsmidth.com · DK reg.no. 15 02 88 82
The calculations are made specific for your configuration. They have a degree of uncertainty but the general trend should be clear. If you let the compressor give you full pressure you can have many more shots before you need to tip-up. If you use no regulator and range from 7 to 6 bars you must start the compressor after 6 shots of 200L or 7 with 150L. If you go from 10 bar to 6 bar you can fire the 150L tanks 24 times before you need to fill up. This will give you less maintenance and in time you may choose to install a smaller compressor or let this compressor supply to plant air also. 3/4
CSD-MIS
FLSmidth A/S Vigerslev Allé 77 · 2500 Valby · Denmark Tel +45 36181000 · Fax +45 36301820 www.flsmidth.com · DK reg.no. 15 02 88 82
I have also been informed that you have a flow regulator with bigger capacity to meet the demands of the added airblasters. I urge you to reconsider installing a pressure regulator. It will give you money saved and a more stable airblaster system.
Yours sincerely
Lars Kuur Field engineer
[email protected] &
[email protected] [email protected]
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