Powder-like material pneumatic transportation device

FIELD: power engineering.

SUBSTANCE: proposed device contains service tank with two valves. Upper valve of service tank is normally open, and lower one is normally closed. Tubular shanks are connected coaxially and hermetically to lower surfaces of each valve. Each shank is installed for vertical shifting onto corresponding outlet end of pipe for impulse delivery of gas. Hydraulic restrictor is installed at outlet end of pipe for impulse delivery of gas.

EFFECT: increased distance of transportation of powder-like material.

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.

A device for the pneumatic conveying of powdered medium containing feed tank, upper and lower valves, level gauge, a control unit, the transport pipeline [1].

The disadvantage of this device is the design complexity, significant gas consumption for aeration of powder medium.

The closest in technical essence to the proposed device of the pneumatic powder-like environment is a device containing a supply tank provided in the upper part with a collecting bin, transport pipes, inlet elbow which is placed at the bottom of the supply tank, a pipe for pulsed gas [2].

The disadvantage of this device is the inability of the pneumatic transport over significant distances, subject to the condition that the exclusion of fluidization gas through the bulk level of the powdered medium in the supply tank.

The aim of the invention is the pneumatic powder-like environment for a considerable distance in the dense layer under pressure.

This goal is achieved by the fact that the device for pneumatic conveying of powdered medium containing a supply tank provided at the top of the hour and with a collecting bin, transport pipeline, the input of the knee which is placed at the bottom of the supply tank, a pipe for pulsed gas flow, hydraulic resistance, the upper and lower valves located respectively in the upper and lower parts of the supply tank, the upper valve is in a normally open position, and the bottom is in a normally closed position against the lower surfaces of each valve coaxially sealed tubular shanks, each of which is mounted with the possibility of vertical movement on a corresponding output end of the tube for pulsed gas flow, and the hydraulic resistance is installed on the output end of the tube for pulsed gas supply lower valve, and front knee transport pipeline is placed over the bottom valve, with the flow area between the inner and outer surfaces respectively of the shank and the output end of the tube for pulsed gas supply must be at least 8 times smaller orifice end of the tube for pulsed gas flow.

Given a set of features allows the pneumatic powder-like environment under the pulsed gas pressure in the piston mode on the distance determined by the average gas pressure in the supply tank.

The invention is illustrated cher the hedgehog, which shows the device for pneumatic conveying of powdered environment.

The device comprises a supply tank 1 provided in the upper part with a collecting bin 2, the transport pipe 3, the input knee 4 which is placed over the bottom valve 5, the upper valve 6, the hydraulic resistance 7 installed on the output end 8 of the tube 9 for pulsed gas supply lower valve. On the bottom surfaces of each valve coaxially sealed tubular shanks 10, 11, each of which is mounted with the possibility of vertical movement on a corresponding output end 8, 12 tube 9 for pulsed gas flow.

The operation of the device is as follows. In the beginning of the cycle the upper valve is open and the bottom closed, filling the internal cavity of the feed tank, powder-like environment. The pulse of gas from the tube 9 into the cavity of the shank 11 of the upper valve 6, moves the latter in a vertical direction to seat the valve, which determines the closing of the inlet and the end of the filling cycle powdered environment.

In the cavity of the shank 10 of the lower valve 5, the gas flows through the hydraulic resistance (jet), so the pressure gradient in the cavity is lower than in the upper valve, this causes the delay of the opening n the life of the valve relative to the upper, therefore, the exclusion of end-to-end message cavities transport pipe 3 and precast bunker 2. The pulse of gas through the weekend ends 8, 12, and the flow area defined by the gap between the surfaces of these tubes and liners, expires in the cavity feed tank, displacing the powdery medium through the inlet elbow 4 in the transport pipe 3. From the duration and medium pressure pneumonolysis depends on the opening of the upper valve 6 and closing the bottom valve 5, the process of closing which will also depend on the difference of the pressures in the cavities of the transport pipe 3 and the supply tank 1. In case of equality of these pressures, due to the hydraulic resistance of the 7 pressure pulse in the cavity of the shank 10 is smaller than, respectively, in the upper valve, which will cause the closing of the lower valve before it opens the upper valve and will begin the process of filling powder medium supply tank. Displaced by the pulse gas piston (dose) powdered medium is moved through the transport pipeline with speed and distance depending on the magnitude of the pressure pulse and its duration. Alternate repetition of cycles of filling and emptying the supply tank forms in the transport pipeline flow of powdered medium in the form of a PEFC is therefore piston gas and powdered environment.

Experimentally it was found that the efficiency of the valves depends upon the flow area between the inner and outer surfaces respectively of the shank and the output end of the tube for pulsed gas supply and bore of this tube. Indeed, when the commensurability of values of these cross sections the process of lifting valves pneumonology becomes lightly managed, as there is a premature discharge of the air through the shank. According to experimental data found that the flow area between the inner and outer surfaces respectively of the shank and the output end of the tube for pulsed gas supply must be at least 8 times smaller bore tube for pulsed gas supply. It should be noted that the increase in orifice tube for pulsed gas supply is limited to the dimensions of the valve and its bore.

Pneumatic transport in the piston mode allows you to reduce the minimum velocity of the particles due to the formation of homogeneous dense layer of piston powdered environment and, consequently, the flow of gas to the pneumatic transport. The distance and height at which it is necessary to carry out the pneumatic transport depend on the magnitude of the pressure pulse gas. For example, for pneumatic transport is 100 m fly ash of thermal power plants at a rate of 0.5 m/s, the porosity of 0.55 pipeline with a diameter of 80 mm is necessary to provide a differential pressure of 2.5 kg/cm2.

Thus, by introducing valve with a tubular shank mounted with possibility of vertical travel on the tube for pulsed gas flow is achieved by the implementation of goal - pneumatic transport in a dense layer at a considerable distance.

Sources of information

1. USSR author's certificate No. 1239064, B 65 G 53/40, 1989

2. RF patent №2115611, B 65 G 53/40, 1997

Device for pneumatic conveying of powdered medium containing a supply tank provided in the upper part with a collecting bin, transport pipes, inlet elbow which is placed at the bottom of the supply tank, a pipe for pulsed gas flow, characterized in that it introduced the hydraulic resistance, the upper and lower valves located respectively in the upper and lower parts of the supply tank, the upper valve is in a normally open position, and the bottom is in a normally closed position against the lower surfaces of each valve coaxially sealed tubular shanks, each of which is mounted with the possibility of vertical movement on a corresponding output the end of the tube for pulsed gas flow, and the hydraulic resistance is installed on ugodnom the end of the tube for pulsed gas supply lower valve, and input the knee transport pipe placed at the bottom of the valve to the flow area between the inner and outer surfaces respectively of the shank and the output end of the tube for pulsed gas supply must be at least 8 times smaller orifice end of the tube for pulsed gas flow.



 

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