Method of pneumatic transportation of powder-like medium from hoppers of ash collectors

FIELD: power engineering.

SUBSTANCE: proposed method of pneumatic transportation of powder-like medium from hoppers of ash collectors comes to delivery of powder-like medium from hoppers into transport pipeline through inlet valve and acting onto surface of inlet valve by pneumatic impulse to close valve by pneumatic impulse to close valve and shaft powder-like medium along transport pipeline under action of pneumatic impulse. When implementing the method, air flow of total volume forming said pneumatic impulse is divided into two parts executing preliminary action of smaller part of total volume onto surface of inlet valve and subsequent action of remaining volume of air onto powder-like medium along transport pipeline. Pneumatic impulse delivery frequency is chosen depending on value of impulse pressure in transport pipeline.

EFFECT: increased length of transportation lines.

1 dwg

 

The invention relates to the field of power engineering and can be used for the pneumatic transport of ash from hoppers of ash collectors.

The known method of the pneumatic powder-like environment, in which the filling of the supply tank powdered environment through the open top of the valve to limit the closing of the upper valve, powder fluidization medium in the supply tank and the displacement powdered environment through output valve [1].

The disadvantage of this method is the complexity of design, low reliability, a significant flow of gas to the powder fluidization medium.

The closest to the technical nature of the present method is a method of pneumatic conveying of powdered environment from bins of ash collectors, consisting in moving powder from bins in the transport pipe, the air supply in an area and moving powdered environment transport pipeline, moving powdered medium in the transport pipeline use input valve by the impact of rising air in the lower cavity to open and move powdery environment transport pipeline passes through inlet pipe sloped impact of pneum the pulse on the top of the cavity input valve to close, moreover, as the input section uses an inclined pipe, the volume of which is chosen less than the volume of pneumonolysis [2].

The disadvantage of this method is the constraint length of the pneumatic transport due to pressure loss at the inlet valve, the design complexity, determined by the necessity of managing the pipeline to open the inlet valve.

The aim of the invention is to increase the length of the pneumatic transport, simplifying the design of the device that implements the method.

This goal is achieved by the fact that in the method of the pneumatic powder-like environment of the bins of ash collectors, consisting in moving powder from bins in the transport pipe through the inlet valve, the effect on the input surface of the valve pneumonolysis to close it and move powdery environment transport pipeline under the influence of the same pneumonolysis, air flow and total volume, forming the above-mentioned pneumosinus, divided into two parts, carrying out pre-impact smaller part of the total surface of the input valve and the subsequent exposure to the rest of the air volume on the powdery medium along a transport pipeline, and the frequency of submission of pneumonolysis choose the largest pulse pressure is I in the transport pipeline.

The invention is illustrated in the drawing, which shows a device that implements the proposed method.

The device has an inlet pipe 1, which is connected with the hopper ash (not shown), the inlet valve 2 mounted with the possibility of rotational movement between the tube end 3 and the seat of the outlet pipe 1. Tubes 3 and 4 is connected to the output end of the solenoid 5 and the input end of the solenoid 5 is in communication with the receiver 6. The output end of the tube 4 is hermetically connected with the input end of the transport pipe 7. The valve 2 and the output end of the tube 3 are accommodated in the housing 8 provided in the lower part to the upper end of the transport pipe. The pressure sensor 9 is connected to the generator 10, the output connected to the solenoid 5.

The operation of the device is as follows. Powdered environment, acting from the hopper ash through inlet pipe 1 moves around the axis of the valve 2 to the output end of the tube 3, ensuring the filling of the cavity of the transport pipe 7. After a fixed period of time generator 10 generates a control signal for opening the solenoid 5, which determines the supply of pneumonolysis from the receiver 6 through the tubes 3 and 4, respectively, in the cavity of the housing 8 and the transport pipe 7. Tube length 3 2-3 RA is rather less than the length of the tube 4, therefore, the valve 2 is closed under the influence of the pulse of air, excluding the passage of air from the tube 4 in the inlet pipe 1 and the hopper. The hydraulic diameter of the tube 3 is also several times smaller than the tube 4, and is selected from the conditions for the creation of neobhodimogo shock (air) impact to close the valve 2. Therefore, the main air flow in the pulse tube 4 is supplied to displace powdered environment from the transport pipeline. According to experimental data obtained that the impact of powdery environment necessary effort to shift its layer 8-10 times less than smooth effect.

Therefore, when using pneumonolysis successively to close the valve and displacement powdered environment (as in the prototype) is significantly reduced gradient pulse power exposure on powdered environment.

When dividing the air stream into two parts, corresponding to the task, the closing of the valve and another portion of the pulse (several times larger) pulse displacement powdered environment, the maximum pulse-force along the transport pipeline. This provides a corresponding increase in the length of the pneumatic transport, for example in the prototype pneumatic transport can be made reliably TLAT 50-60 m For the same value of pressure in the receiver in this way pneumatic transport is at a distance of 200 m with a rise of 10 m and turns 90°. The direction vector of the impulse excitation along the transport pipe also reduces loss of pulse pressure in the pneumatic line.

It was established experimentally that the magnitude of the pulse pressure in the pneumatic transport in a pipeline depends on the volume of powder medium. After the passage of the piston powdered environment larger (length), the pressure sensor detects the increase in pulse (peak) pressure. In the case of incomplete loading of powdered environment part of the air pneumonolysis will fluidsurface to the previous piston and the pressure pulse will be reduced. Considering this effect is simply to adjust the frequency of pulses (per unit time) on the magnitude of the pulse pressure in the transport pipeline. For example, this option is useful when the flow in the transport pipeline powdered environment from sequentially placed bunkers. In this case, adjusting the frequency of the supply pneumonolysis impossible by other means, such as level gauge.

Thus, due to the separate supply pneumonolysis to close the valve and displacement powdered the environment is an opportunity to extend the length of the pneumatic transport, simplify the design of the device.

Sources of information

1. USSR author's certificate No. 1239064, B65G 53/40; 1989

2. RF patent №2271979, B65G 53/16; 2004

Way pneumatic powder medium from the storage silos ash catchers, which consists in moving powder from bins in the transport pipe through the inlet valve, the effect on the input surface of the valve pneumonolysis to close it and move powdery environment transport pipeline under the influence of the same pneumonolysis, characterized in that the air flow with a total volume of forming the above-mentioned pneumosinus, divided into two parts, carrying out pre-impact smaller part of the total surface of the input valve and the subsequent exposure to the rest of the air volume on the powdery medium along a transport pipeline, and the frequency of submission of pneumonolysis choose the value of pulse pressure in the transport pipeline.



 

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