連采機降塵介紹.ppt

1、Dust Suppression System Components,Efficient systems are a properly designed combination of three sub-systems Mine Ventilation Machine Mounted Flooded Bed Dust Collector Machine Mounted Dust Suppression Water Sprays Inefficient combination of the three will equal a inefficient dust suppression syste

2、m,1,Mine Ventilation,Mine ventilation must be designed and maintained in accordance with overall mine layout and conditions. Miner dust collector capacity, configuration and water spray configuration, and/or Wethead head option must be based on mine layout and conditions: Ventilation fan capacity to

3、 properly ventilate mine face Ventilation design plan to provide fresh air to miner/face Mine conditions Past experience,2,Machine Mounted Flooded Bed Dust Collector (FBDC),3,Machine Mounted Flooded Bed Dust Collector (FBDC),System designed to remove dust from mine air, or “scrub” the air Flooded Be

4、d Dust Collector Components Intake Chassis mounted ductwork Water sprays Dust impingement screen Mist eliminator (demister) Dust collector fan Sound attenuation Exhaust,4,FBDC Inlet Options,Chassis only ductwork Typically effective up to 1.6 M seam heights Directional sprays are commonly used to hel

5、p facilitate fresh air across face and into ductwork inlet Cutter frame ductwork Effective in seams above 1.6 M due to additional height requirements for cutter frame ductwork Cutter frame ductwork provides air inlet closer to face, necessary in seams above 1.6 M due to larger area requiring dust ex

6、traction and suppression,5,FBDC Chassis Mounted Ductwork Options,Ductwork options Fan size / capacity is based on mine ventilation capacity and mining height Ductwork size is based on fan size/capacity in order to allow fan to perform to design specifications Ductwork construction Ductwork is a fabr

7、icated rectangular tube with a impingement screen located between inlet and demister Water sprays are located near filter to help for cleaning. However, regular filter maintenance is required for system to function properly Demister box is located next to fan to extract dust/dirt slurry from air and

8、 system prior to exhaust thru fan,6,FBDC Water Sprays,Cutter frame ductwork sprays options Constant sprays at each inlet Flushing sprays to clean ductwork No sprays Combination of the above Dust impingement screen spray Designed to provide constant water to clean filter. Sprays also facilitate dust/

9、dirt into a water slurry for extraction by demister and discharge off machine. Back flush sprays are optional to further help clean filter Filter does still require regular manual cleaning,7,FBDC Mist Eliminator (Demister),Stainless steel constructed housing with vertically mounted vanes Sized to ma

10、tch air flow velocity Efficiency of water elimination is proportional to size Water/dust slurry is extracted from sump under demister and discharged either at cutter frame or gathering head frame or into conveyor as opted. Discharge air then goes thru fan and out thru attenuator.,8,FBDC Fan,9,FBDC F

11、an,XP, air cooled motor with fan rotor mounted in steel housing Options 19 kW Low Flow = 2.7 m3/s nominal 19 kW = 3.2 m3/s nominal 19 kW High Flow = 3.7 m3/s nominal 26 kW = 5 m3/s nominal Total system airflow affected by intake and exhaust options,10,FBDC Sound Attenuation,Attenuation material is s

12、tandard on fan housing Sound attenuator mounted to fan exhaust. Also may direct airflow,11,FBDC Exhaust Options,Fan Side Air is exhausted on fan side of the machine through fixed or adjustable louvers Fan side or opposite side Air can be directed to either side of the machine thru machine mounted du

13、ctwork 14CM - LH / RH thru the bumper discharge 12CM Cross-under ductwork,12,Machine Mounted Dust Suppression Water Sprays,13,Machine Mounted Dust Suppression Water Sprays,Machine cooling water exhausts through water sprays Sprays options Directional sprays Provide dust suppression on cutting drums

14、Also help facilitate fresh air movement across face to dust collector inlet. Non-directional sprays Provide dust suppression on cutting drums Also help reduce amount of dust going into ductwork inlet on cutter frame. Water consumption dependent on option Requirements usually dictated by mine conditi

15、ons and ventilation plan. Wethead cutter head gearcase,14,Non-directional Spray System(Also Shown with Wethead Spray Option),15,Wethead Cutter Head Gearcase,Wethead Requirements,At least 17.2 bar (250 psi) dynamic pressure at rear of machine to get 6.9 bar (100 psi) at nozzles Minimum of 189 liters/

16、min (50 gpm) total machine water flow (dependant on nozzle size, pressure, spray configuration and drum lacing) Minimum of 1-1/4” main machine water supply hose Wethead and Flooded Bed Dust Collector recommended to run in conjunction for best dust control Not recommended to run completely dry. Alway

17、s provide at least 1.9 L/min (0.5 gpm) to Wethead when cutterhead is operating.,J35 Wethead Block,Available w/ 30mm or 35mm sleeves Used on longwall shearer drums 2 nozzle sizes available Nozzles can be removed with a screwdriver,J35,Dust Study Results(Wethead vs Standard),Independent third party du

18、st evaluations by: CSIR Miningtek SIU (Southern Illinois University) MSHA (Mining Safety and Health Administration) NIOSH (National Institute for Occupational Safety and Health) 2 independent studies at 2 different locations Improvements in dust levels - based on average respirable dust concentrations 35% lower vs. non-Wethead in the Return (SIU) 50% lower at the CM operator (CSIR Miningtek) 42% lower at the SC operator (NIOSH) Quartz / Silica levels (1 study - NIOSH) 11% lower in the Return 9% lower at the CM operator 66% lower at the SC operator,MSHA Inspector Dust Samples,MSHAs Data