CS239358B1 - The method of cleaning railway tanks - Google Patents

Abstract

The invention solves a method of cleaning railway tanks from settled phosphogypsum with a closed circuit of a pressure cleaning medium with intermittent action, whereby the interruption of the cleaning medium flow occurs depending on the movement of the arms of the swinging nozzles of the cleaning device. The flow of the cleaning medium is interrupted at the moment when the arms of the swinging nozzles are at rest, i.e. in two extreme positions, whereby the flow of the cleaning medium is interrupted for the time required for the mixture to drain from the tank. The mixture of cleaning medium and sediment, which flows out of the tank by gravity, is led to the disruptor, where it is homogenized and then led through the equalization tank to the storage tank.

Description

4 239358

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process for cleaning ferrous tanks with phosphoradecyls with a closed circuit of a pressurized cleaning medium. Often, in industrial practice, there is a need for the purification of tanks carrying particulate matter that sediment over time. A particular example is the deposition of phosphoric acid from phosphoric acid, which forms a hard and laborious removable layer at the bottom of the vessel.

He passed the known methods of removing the effluents manually by flushing the water through the hydrant gun, assuming the worker to enter the space of the cleaned vessel. The disadvantage of the sediment removal process is the fact that, in the case of aggressive or toxic environments in a clean vessel, the entry of persons into this space is detrimental to health or is completely excluded. Solutions are known for applying a high-pressure water jet of 10-20 MPa, which is provided by high-pressure sand pumps, and is distributed to the outside of the cleaned area. The disadvantage of this solution is the high energy efficiency, the high purity purity of the cleaning medium due to the fine mechanical parts of the high pressure piston pump, and the low efficiency of the high pressure cleaning stream which is not concentrated on the settled areas as well as the flats which they do not require sailing. It is known in particular to break down the incrustation of phosphosadium by treatment with a solution of carbonate and carbonate. ammonia water with peri-periodic substitution of this solution with phosphoric acid, according to the Czechoslovak Authors' Certificate AO 180 739.

This solution utilizing chemical disruption of the encrustations by reaction between the carbonate solutions and the phosphate supernatant, respectively. phosphoric acid accompanies the formation of gaseous exhalations in the form of NH; and CO2. Therefore, the solution requires a number of measures to control the disposal of these exhales. In addition, it is bound to the source of the specified solution, so its use is not limited. Furthermore, German Patent Publication No. 1,593,045, which deals with the removal of sludge and heavy sediments, is deposited in an ejector manner followed by filtration of the mixture, wherein the process is not designed to utilize the sediment.

The above drawbacks are eliminated by the cleaning of the de-phosphated railway tankers with the closed circuit cleaning medium and its interrupted action according to the invention, the fact that the purification medium stream, which is phosphoric acid, is interrupted during cleaning depending on the movement of the swing nozzle dates. The purge stream is interrupted at the moment when the rocker jets are in their abundance, that is to say in the two extreme positions, where the purge stream is interrupted for the time required to remove the phosphoric acid / phosphogypsum mixture from the tank. The phosphoric acid / phosphosadium mixture, which flows through the gravity tank, is fed to a homogenizer, homogenized somewhere, and then pumped through an equalization tank into a phosphoric acid reservoir.

The higher effect of purification of phosphoradium railway purifiers according to the invention consists in interrupting the flow of the cleaning medium as a function of the movement of the swinging nozzles, at the moment when the rocker arms are in the rest, i.e. in two-sided positions. In this way, it provides that the purge medium stream only causes sediment, and does not lose its energy in places where there is no sediment, thereby increasing the overall cleaning effect. By abolishing the purification medium stream at the time required to drain the phosphoric acid / phosphosadium mixture from the tank, it achieves a higher purification effect, since phosphoric acid does not form an anti-sediment liquid to reduce the purification effect. of the phosphoric acid stream. TTogenogenation of the phosphoric acid / phosphate mixture produces a pumpable mixture which is impure and therefore can be used for further technological processing in the manufacture of industrial fertilizers. A summary of the above-described effects of purification according to the invention represents a new purification of phosphogypsum railway tanks.

BRIEF DESCRIPTION OF THE DRAWINGS In the accompanying drawing, there is shown a technological connection for converting the purification of a railway cistern with phosphoric acid from phosphorus in the closed circuit of the invention:

From the phosphoric acid reservoir 1, the phosphoric acid flows into the suction pipe of the centrifugal pump 2, from which the phosphoric acid is fed under a pressure of 1.4 MPa into the purification device 3 by means of a pressure pipe 10 terminated by a pressure hose. Phosphoric acid exits the purge device 3 through nozzles which are dimensioned to the performance of the centrifugal pump. By the transverse movement of the cleaning device arms 3 and the lateral swinging movement of the spray nozzles, the phosphoric acid stream is directed and concentrated on the deposited sediment layer, wherein the phosphoric acid stream is interrupted during the cleaning operations depending on the movement of the swinging arm arms. In such a way that in the opened and closed position of the cleaning device arms, the cleaning current is interrupted and in the intermediate position. The mixture of phosphosadium and phosphoric acid flows from the tank 4 by gravity through the outlet pipe 5 to the homogenizer 6, in which the agglomeration eventually falls off.

Claims (3)

5,239,338 sediment measurements. The flow rate of the cleaning medium / sediment mixture from the surface deposited layer is vertical to the size of the opening on the tank 4 and the performance of the centrifugal pump 2. Since the discharge opening of the tank is eaten, the use of a high-flow centrifugal pump results in a build-up of cleaning fluid. médianad layer of sediment, which reduces cleaning efficiency. In this case, it is particularly desirable to interrupt the flow of the cleaning medium by means of a shut-off pneumatic valve 9. A homogeneous mixture of sediment and cleaning medium flows into the buffer tank 7 from where it is pumped by the pump 8 to the storage tank 1 or for further technological processing . The buffer tank serves to provide a constant inlet to the exhaust pump 8, which purges the phosphoric acid / phosphosadium mixture either directly from the fertilizer production process or into a phosphoric acid reservoir 1 equipped with stirrers and thereby water is no longer sedimented in reservoir 1. Upon completion of the purification, the equalization tank 7 is emptied by the pump 8 to settle therein. The invention can also be advantageously applied to the removal of high viscosity liquids such as pitch, mineral oils, syrups, vials and the like. from tanks, tanks and pipes. These after exhaustion resp. the high viscosity curves remain on the wall of the container and collect over time in the bottom of the container. For these substances, the sedimentation medium forms a solution or emulsion. According to the nature of the purification, the mechanical and / or hydrodynamic disintegrator according to the invention has the function of a mixing tank or emulsifier. In the event of the use of a detergent, it is possible to continuously dispense this centrifugal pump of the centrifugal pump. OBJECT A process for purifying railway cisterns deposited with phosphoradium with a closed circuit of pressurized cleaning medium and with intermittent action, characterized in that the stream of purification medium, which is phosphoric acid, is interrupted during purification depending on the movement of the swing nozzle arms . 2. A method for purifying railway cisterns deposited in phosphorus according to claim 1, wherein the flow of purification medium interrupts the time required to drain the phosphoric acid and phosphoraders from the cistern at the moment when the rocker arms they are in the calm, ie in two extreme positions. 3. A process according to claim 1 or 2, characterized in that the phosphoric acid / phosphosadium mixture flows out of the tank by gravity and is then fed to a homogenizer where it is homogenized and then pumped through a buffer. a reservoir into the phosphoric acid reservoir. 1 sheet of drawings