The total length of gas roadway required for the lower coal-returned main road is about 710 meters, and the roadway clear-cut area is 16.06 m2. The estimated gas storage is 182.44 m3, and the estimated discharge time is 31 minutes. In order to ensure the safety of gas emissions, the following safety technical measures are formulated:
1. Calculation of relevant parameters of emission gas
(1), the amount of gas accumulation:
Q product = L × S × C = 710 × 16.06 × 1.6% = 182.44 (m3)
Where: L - gas accumulation roadway length, m
S——Gas accumulation roadway average section, m2
C——the average concentration of gas accumulated in the roadway, %
(2) Maximum allowable emissions in the return air zone:
Q row 1 = Q × (CC real) = 1200 × (0.6 - 0.1) % = 6 (m3 / min)
Confluence of sewage and return air alley
Q row 2 = Q × (CC real) = 1200 × (0.6-0.02)% = 6.96 (m3 / min)
Where: Q——the actual air volume in the return airway, m3/min
C—— Allowable gas concentration in the return airway, %
C real - the actual gas concentration before the discharge of gas in the return airway, %
(3) Time required to discharge gas:
t=Q product / Q row = 182.44/6=31 (min)
Where: t——time required to discharge gas (min)
Q product - gas accumulation, m3
Q row - the maximum allowable discharge in the return air zone, take the minimum value, m3
It is calculated that the time required for discharging gas is the theoretical value, and the actual discharge time in the underground is shortened or extended according to the actual situation.
2. When the gas is discharged, the air volume sent to the exhaust gas lane is controlled by controlling the air volume of the air blower. The gas concentration at the return air at the back of the lower group of the lower group and the lower coal section of the lower group shall not exceed 0.6%.
3. The discharged gas flows through the route
Working face → lower group coal return wind alley → return wind eye → 760 east return wind lane → south wing total return wind lane → south return wind well → ground.
4. Discharge gas Use a local ventilator to install the left gang of the roadway in the direction of fresh airflow 10 meters away from the intersection of the lower coal belt.
5. All personnel in the returning winds of the lower group of coal before the discharge of gas must be evacuated to the fresh airflow of the lower coal belt.
6. The alert personnel shall set up warnings in the lower coal belt, the return air contact lane and the lower group coal return airway. It is strictly forbidden for any unrelated personnel to enter.
7. The electrical equipment in the roadway of the gas returning main road must be cut off and locked. The stop and power transmission executives are full-time electricians on the team.
8. The location where the gas must be inspected is the extension of the air duct, the return air of the lower group of coal, and the returning wind of the lower group of coal returning winds.
9, after the completion of gas emissions, must be fully and carefully checked by two watts inspector counterparts from outside to inside concentration of carbon dioxide and methane gas roadway only when the gas concentration is lower than 0.6%, carbon dioxide concentration of less than 1.5%, and When there is no abnormal change in the gas and carbon dioxide gas concentrations, the person in charge of the on-site discharge will be allowed to resume normal ventilation and withdraw the warning. The person in charge of the discharge gas site shall conduct a comprehensive inspection and acceptance of the discharge area, and determine the qualified dispatching of the mine dispatch before the power transmission can be resumed. The discharge personnel can be evacuated and the discharge work is completed.
10. Discharge gas personnel arrangements
Machine Pictures:
CL-80/100/80H-2000MM
CL-80/100/80H-1500MM
Featurers of Model CL-80/100/80H-1500mm
1.Strong Double Layer Vacuum Box Device
Strong Double Layer Vacuum Box Device helps absorb the hot air between film and cooling roller,which makes the film be more closed and tightly to the cooling roller thus enhance the cooling effect when the machine is running in high speed.
2. High Quality and Updated Advanced Cooling System
The cooling roller's diameter is 1000mm with bi-directional loop design and helix runner inside.The high-precision steel is adopted to ensure stable temperature on roller surface.
3.Melting Pump--Plastic melt metering pump is more and more important in extrusion process, especially in high-end products industries, such as high quality sheets, pipes, BOPP, optical cable.Installing the melt metering pump in the cast stretch film unit can make the machine produce constantly and efficiency. The pump can improve the product quality, stable the production process and decrease the energy consumption.
4.Four Air Shaft Roll Changers Device
One roll change takes only 30 seconds and this system can help produce small hand roll online when the machine is running in high speed.And so there is no need to install a Rewinding Machine to rewind,which helps save a lot of time, cost and labor.
Plastic melt metering pump is more and more important in extrusion process, especially in high-end products industries, such as high quality sheets, pipes, BOPP, optical cable.
Installing the melt metering pump in the cast stretch film unit, which can keep the production constantly and efficiency. The pump can improve the product quality, stable the production and decrease the energy consume.
The housing is made of chromium-nickel alloy or nickel-base alloy, titanium alloy. The gear is made of quenching chromium steel, other metal materials are also applicable. Bearing is made of graphite NIAG, zirconium oxide or quench tool steel.
Advantages:
FAST AND STABLE FLOW SUPPLY
Eliminated the extruder`s pulsation wave. Improve the product quality, decrease the defective rate, and decrease the waste, which can save 2% material and 25% of the unit power consumption.
STABLE AND EFFICIENCY PRESSURE CONTROL
The melt pump can provide a stable pressure, which short the discharge time obviously and make the production effectively.
INCREASE THE EXTRUDER OUTPUT AND THE MACHINE LIFE
It has been found that after install the melt pump, the max pressure wave value is the pressure after pump. Which can make the inner pressure of the extruder decrease, the melt shear strength decrease, the temperature curve gently, and restrain the temperature rising. Also the melt pump can avoid the damage to the extruder from the high pressure.
Main Technical Specification of CL-80/100/80H-1500mm
(Such as plastic film machinery.)
(1) Overall Dimensions(L*W*H): 14m*6.5*4.45
Max width of rewinding: 500mm*3
Max Rewind Diameter: ø400mm
Liner speed of machinery: 350m/min
(2)Rewind the film by combining it`s surface and core to make the film roller tightly closed and level and smooth.
(3)Remove the film roller and install the paper tube at the same time, which only takes about 25-30s and produce 2-3kg small film roller when the machine is running in high speed.
(4)Automatic edge material recycling system with on-line vacuum makes the process of rewinding more smooth, increases the fracture resistance, and decreases the limitation by liner speed.
(5)The recycling materials are extruded out from only and specific screw to stable the the extrusion system and to decrease the deviation about the weight of film.
(6) The extrusion machine is driven by coupling which stables the extrusion process and therefore stables the film output from die head.
(7)Prompt measurement to adjust the thickness and uniformity of the film easily.
High Speed Stretch Film Machine
High Speed Stretch Film Machine,Automatic High Speed Stretch Film Machinery,High Speed Stretch Film Unit
CHANGLONGXING SCIENCE & TECHNOLOGY (SHENZHEN) CO.,LTD , https://www.clxmachinery.com