Method of distributing and transporting powdered or granular material

In a system having a pressurizing tank having a weighing device and adapted for pressurizing and fluidizing a powdered or granular material, a plurality of transportation pipes having one ends constituting discharge nozzles opening above a fluidized bed in said tank and the other ends connected to different feeding ends so as to introduce said material to said feeding ends, and a plurality of booster gas supply pipes for supplying respective transportation pipes with a booster gas,

• a method of directly distributing and transporting said material to said feeding terminals comprising the steps of:
• calculating the sum of predetermined set flow rates of said material to said feeding ends, and providing a signal representing said sum as a set value;
• calculating actual discharging rate of said material from said pressurizing tank through calculating a rate of change of weight of said pressurizing tank by said weighing device, and providing a signal representing the actual discharging rate;
• comparing said signal representing said sum with said signal representing the actual discharging rate and providing a comparison signal;
• determining a set value of an internal pressure of the pressurizing tank in accordance with said comparison signal and providing a signal representing said set value of the internal pressure;
• detecting an actual internal pressure of the pressurizing tank and providing a signal representing said actual internal pressure;
• comparing said signal representing said set value of the internal pressure with said signal representing said actual internal pressure and providing a control signal;
• and
• controlling the internal pressure of the pressurizing tank in accordance with said control signal.

In a system having a pressurizing tank provided with a weighing device and adapted for pressurizing and fluidizing a powdered or granular material, a plurality of transportation pipes having one ends constituting discharge nozzles opening above a fluidized bed in said tank and the other ends connected to different feeding ends so as to introduce said material to said feeding ends, and a plurality of booster gas supply pipes for supplying respective transportation pipes with a booster gas,

• a method for directly distributing and transporting said material to said feeding ends comprising the steps of:
• determining set values of pressure differentials across said discharge nozzles of said transportation pipes in accordance with predetermined set flow rates of said material to said feeding ends;
• delivering signals representing said set values of said pressure differentials to pressure differential controllers together with signals representing actually measured pressure differentials across said discharge nozzles;
• determining, in accordance with output signals from said pressure differential controllers, set values for booster gas flow rate controllers for controlling flow rates of said booster gas to the respective transportation pipes;
• and
• controlling a discharging rate of the material in each of the transportation pipes by individually controlling a flow rate of said booster gas in accordance with each of said set values.

In a system having a pressurizing tank provided with a weighing device and adapted for pressurizing and fluidizing a powdered or granular material, a plurality of transportation pipes having one ends constituting discharge nozzles opening above a fluidized bed in said tank and the other ends connected to different feeding ends so as to introduce said material to said feeding ends, and a plurality of booster gas supply pipes for supplying respective transportation pipes with a booster gas,

• a method of directly distributing and transporting said material to said feeding ends comprising the steps of:
• determining a first set value of an internal pressure of said pressurizing tank in accordance with a mean value of the terminal pressures at said feeding ends, a mean value of predetermined set flow rates of said booster gas in said booster gas supplying pipes, and a mean value of predetermined set flow rates of said material to said feeding ends;
• calculating a sum of the predetermined set flow rates of said material to said feeding ends, and providing a signal representing said sum;
• calculating actual discharging rate of said material from said pressurizing tank through calculating a rate of change of weight of said pressurizing tank by said weighing device, and providing a signal representing the actual discharging rate;
• determining a second set value of the internal pressure of said tank in accordance with a comparison signal being provided by comparing said signal representing said sum of the predetermined set flow rates of the material with said signal representing the actual discharging rate of said material;
• correcting said first set value of the internal pressure of said pressurizing tank in accordance with said second set value and determing a corrected set value;
• detecting an actual internal pressure of the pressurizing tank and providing a signal representing said actual internal pressure;
• controlling the internal pressure of the pressurizing tank in accordance with a control signal being provided by comparing said corrected set value and said actual internal pressure;
• determining set values of pressure differentials across said discharging nozzles of said transportation pipes in accordance with said predetermined set flow rates of said material to the respective feeding ends;
• delivering signals representing said set values of said pressure differentials to pressure differential controllers together with signals representing actually measured pressure differentials across said respective discharge nozzles;
• determining, in accordance with output signals from said pressure differential controllers, set values for booster gas flow rate controllers for controlling flow rates of said booster gas to the respective transportation pipes;
• and
• controlling a discharging rate of the material in each of the transportation pipes by individually controlling a flow rate of said booster gas in accordance with each of said booster gas flow rate controllers.