CS220237B1 - Apparatus for hydraulic conveyance of bulk materials - Google Patents

Abstract

The invention relates to the field of hydraulic transport sandblasting materials, in particular power plant fly ash. The essence of the device is that it consists at least one conical tank bottom to which they are led by fittings controllable pipe branches, individually designed to supply a slurry of sand-fly and compressed gas and for pressure supply water from the pump. Pipe branch from pump at the same time it turns into a drain pipe branches and these connected branches follow the traffic piping of hydrosmixture.

Description

BACKGROUND OF THE INVENTION The present invention relates to the hydraulic conveying of piston copolymer materials (sand or fly ash structure materials), in particular fly ash from power plant boilers by pressurizing water or gas to a pressure tank filled with a slurry of water and fly ash.

The current state of hydraulic transport of the fly ash is characterized by the fact that the fly ash is transported in dry state from the electric filters to the dredging station. Here it is fed into the dredge pit together with the navigable water.

This hydro-mixture is then pumped from the dredging pit by dredging pumps to the conveying piping and thereby discharged to the storage area. The water is pumped from the storage area after the ash sedimentation. The disadvantages of the present method of hydraulic fly ash conveying are the following: low lifetime of the dredging pumps, since the pumped water mixture is very abrasive. Dredging pumps have a considerably lower head than water pumps, so pumping stations must be built for long-distance transport or adverse terrain. Another disadvantage is the need for dual pumps, water for conveying the water to the dredging station and dredgers for transporting the hydro-mixture to the dump, further low operation of the whole system caused by double pumping of large amount of the water. 1:15 to 1: .20, which generates a large consumption of water.

The above-mentioned drawbacks and disadvantages are overcome by the invention which is based on the hydraulic transport of sand-and-ash materials, in particular fly ash, by means of a water pump or other pressurized water source which pushes the water through one pipe branch directly into the conveying pipeline and the other pipe through a fly ash and water into the transport pipeline indirectly. By controlling the flow rate of the water in the two pipe branches, taking into account the density of the slurry of fly ash and water in the pressure tank, the ratio of fly ash to water conveyed by the water mixture can be precisely adjusted, which can be reduced several times over the known system. The pressure of water on the pressure tank in the second pipe branch can be replaced by pressure of the pressure gas.

By introducing hydraulic transport of fly ash by means of a pressure vessel, the existing system achieves: reduction of investment costs by simplifying the transport system, ie by draining the dredging station and reducing the water supply equipment, or by draining the pumping station due to the higher head of the water pump. Reducing electricity and steam costs by omitting a dredging station or possibly a pumping station and other electricity costs by pumping several times less navigable water, which can in some cases discourage hydraulic transport.

Reduce maintenance costs, spare parts and maintenance workforce by significantly reducing technological equipment. Saves labor by draining equipment that requires continuous operation.

Increased operability of the system by its simplification with the possibility of discontinuation, which results in easy adaptability to the variable amount of fly ash produced with respect to the season.

The drawing shows schematically a concrete example of hydraulic transport of fly ash using a pressure tank and a water pump.

From the navigable water source 1, the navigable water is withdrawn by the water conveyor pump 2 and further pushed into the pipeline branches 3 as pressurized water and the second pipeline branches 4 as pressurized navigable water. The pipeline 4 leads the pressurized canalization water further to the conveying piping 7 of the hydro-mix, which is already the transport route of the hydro-mix. A pressure slurry of fly ash and water is prepared in the pressure tank 5 in the pressure tank 5 and is fed to the pressure tank 5 under pressure without pressure before the water conveyor pump 2 is started. provided with a pressure cap, which is then closed during the transport of the hydro-mixture. The pressurized water from the duct 3 pushes the slurry from the pressure tank 5 through the duct 6 into the conveying duct 7 of the hydro-mixture. Here, the slurry is mixed with pressurized water from the pipeline branch 4. By varying the flow rate of water in the pipeline branches 3, 4, an optimum ash / water ratio can be achieved in the conveyed hydro-mixture. After the slurry has been completely discharged from the pressure tank 5, the pressure tank 5 or 1 of the conveyor line 7 of the hydraulic mixture is discharged by means of a pressure gas during discontinuous operation. Otherwise, in the case of continuous transport, it is necessary to alternately fill and empty two pressure tanks.

Multiple pressure tanks will be used occasionally in order to match the time of filling and emptying the pressure tanks with respect to the capacity of the pressure tanks, the production of fly ash and the capacity of the filling equipment - only an increase in the parallel number of tanks for reliable operation.

The invention can be used in all sectors of industry where hydraulic transport of bulk material is possible, the properties of which permit the formation of a slurry with a liquid. For example, in chemistry, mining, kaolin mining, food processing, sewage treatment, the timber industry, etc.

Claims (1)

Apparatus for the hydraulic transport of bulk materials, in particular sand-sand-ash materials, in which the slurry of sand-sand-ash is prepared in at least one conical-bottom pressure tank and is discharged from the pressure tank, characterized in that 5) there are orifices operated by pipeline branches (8, 9) for the supply of slurry of sand-ash and pressure gas, then SUMMARY OF THE INVENTION An additional duct (3) for supplying pressurized water from a conveyor pump (2), wherein said duct (3) branches into a duct (4) with transport pressurized water from the same pump (2J) into which an outlet duct ( 6) from the lower conical part of the pressure tank (5) and both these piping branches (4, 6), after their connection, result in the conveying piping (7) of the hydraulic mixture.