RU2791788C1 - Flushing system for the ribbed surface of heat exchange pipes of air cooling units - Google Patents

Abstract

FIELD: energy.

SUBSTANCE: invention can be used for air cooling units (ACU) used in the chemical, metallurgical, oil, gas and energy industries. In the system for washing the finned surface of heat exchange tubes of air cooling units, consisting of a mobile pumping station on which a drum for winding the main high-pressure hose, a movable chassis with a washing mobile carriage, on which two collectors with flat-jet nozzles for spraying water under high pressure, two guides for roller carts of the movable chassis, chassis movement drive, main high-pressure hose movement mechanism, and control panel are installed. The mobile pumping station is mounted on swivel wheels equipped with brakes, with the ability to move and lock to a convenient place for work, while the drum for winding the main high-pressure hose is located directly on the heavy-duty trolley of the mobile pumping station with the ability to supply water to the high-pressure hose through the axis of rotation drum. There is also a high-pressure pump, a two-stage water filtration system, guides with C-shaped and U-shaped profiles, the main hose for high pressure water supply to the spray nozzles.

EFFECT: advantages of the system are the simplification and reduction in the cost of the design, increase in reliability of the system, cleaning of the finned surface of the heat exchange sections of the ACU in the explosive zone.

1 cl, 5 dwg

Description

The invention relates to the field of energy and can be used for air coolers (ACO) used in the chemical, metallurgical, oil, gas and energy industries. In the process of operation, the outer surface of the finned heat-exchange tubes of the air cooler is polluted with dust, pollen, plant seeds and other organic and inorganic particles, which worsen the heat-exchange properties of the air cooler. To restore the passport characteristics of air coolers, it is necessary to periodically clean their outer finned surface.

A known method of cleaning heat exchange tubes of air-cooling apparatuses of compressor stations of main gas pipelines, including purging particles deposited on the tubes with pressurized air after preliminary removal of large deposits from the lower rows of heat exchange tubes using scrapers (RF Patent No. 2302912).

The disadvantages of the known analogue are the complexity of the process and the risk of damage to the fins of heat exchange tubes due to the use of scrapers and manual labor.

A known method for cleaning the outer surface of aluminum and aluminum alloys of air coolers, carried out in three stages, including in the first and third stages, jet washing of the surface with heated water or a mixture of water with steam at a jet pressure of 20-150 bar, and in the second stage - jet surface treatment with a 0.25-1.5% aqueous solution of a heated acid detergent, with a jet pressure of 20-150 bar and holding for 10-30 minutes (RF Patent No. 2520839).

A disadvantage of the known cleaning method is its high labor intensity, due to the implementation of jet washing in three stages using an acid-based detergent.

A well-known external flushing system (SNP) AVO gas, consisting of: a flushing device for the preparation and supply of washing liquids and a manifold for external washing with nozzles for direct distribution of washing liquids over the surfaces of finned tubes. Washing is carried out in 2 stages. At the first stage, a washing solution is supplied. The pressure in front of the nozzles when supplying the washing solution is 1-2 bar.

At the second stage, the tank is filled with water and, after the holding time, water is supplied. The pressure in front of the nozzles when supplying water is 20-22 bar. As washing liquids, a weakly alkaline washing solution and water are used (RF Patent No. 2656801).

The disadvantage of this system is the dependence on the need to purchase a detergent, high labor intensity, the risk of damage to the fins of heat exchange tubes, since the technology provides for the operator to move along the finned surface during the entire washing cycle of the apparatus, and the use of stationary collectors with spray nozzles significantly increases the cost of the system and air coolers, in of which it is included.

A flushing system manufactured by JNW Cleaning Solutions GmbH, Germany (website - www.jnw-cs.info.) is known, where the energy of a high-pressure water jet (water jet cleaning) is used to remove deposits. During water-jet cleaning, water, depending on the nature of the deposits, is supplied to the apparatus at a pressure of 4.0 to 10.0 MPa, which makes it possible to remove almost any deposits from the outer surface of the pipes. For cleaning, ordinary cold water is used, supplied by a plunger pump through hoses to a carriage automatically moving above the finned surface, on which nozzles are fixed, forming a flat jet directed parallel to the fins of the heat exchange tubes.

The disadvantage of this system is its high cost, since the movable chassis with a washing carriage and guides cannot be quickly dismantled and transferred to another block of air coolers and, therefore, each AVO group needs to install its own system of guides and movable chassis. In addition, the specified flushing system is not suitable for air coolers with heated air recirculation.

The closest in technical essence and achieved effect is the system of water jet cleaning of the finned surface of the heat exchanger tubes of air coolers manufactured by AX System, France (website www.ax-system.com.), Consisting of two C-shaped aluminum guides connected in a rigid structure , a mobile carriage with flat jet nozzles, a hose pusher with a hose reel, a mobile high-pressure pumping unit and a control system.

The main disadvantages of the ABO finned surface flushing system from AX System are:

– the need for operators to move along the finned surface of the heat exchange tubes both during the installation of guides and when rearranging the guides in the transverse direction for the next working step;

- a heavy drive (pusher) with a hose reel, which must be lifted to the air cooler service platform and moved together with guides after each working pass (for cleaning the next group of pipes);

– at least 2 people are required to move the rails (1 on each side of the heat exchange section);

- the presence of two C-shaped guides requires increased accuracy of the assembly of the structure, since in the case of even small deviations from parallelism and flatness, jamming of the movable carriage is inevitable;

– the presence of guides on the heat exchange surface of the section increases the zones of finned tubes that are inaccessible for washing;

- lack of explosion-proof design, which will not allow cleaning the heat exchange surfaces of air coolers of gas in fire and explosion hazardous areas.

The technical objective of the present invention is to minimize the movement of service personnel along the finned surface of air coolers, to provide the possibility of using a system for washing the heat exchange surfaces of air coolers with recirculation of heated air, to simplify and reduce the cost of the design, to increase the reliability of the system, to reduce dead zones and to increase the efficiency of cleaning the finned air cooler surface, as well as providing the ability to clean the finned surface of gas air coolers located in the explosive zone.

The set technical task is achieved by the fact that in the system for washing the finned surface of heat exchange tubes of air coolers, consisting of a mobile high-pressure pumping unit on which a drum is installed for winding the main high-pressure hose, a movable chassis with a washing mobile carriage, on which two manifolds with flat-jet nozzles for spraying water under high pressure, two guides for roller carts of the movable chassis, chassis movement drive, mechanism for moving the main high pressure hose, control panel, what is new is that the high pressure mobile pumping unit is installed on swivel wheels equipped with the possibility of moving and locking to a place convenient for work, while the drum for winding the main high-pressure hose is located directly on the heavy-duty trolley of the mobile pumping unit the possibility of supplying water to the high-pressure hose through z axis of rotation of the drum, and the high-pressure pump has a safety valve, overload protection and protection against dry running in the form of a pressure switch to control the water supply at the inlet, while a two-stage water filtration system is installed at the pump inlet, the system components are located for operation during explosive zone have the appropriate type of explosion protection, and the guides for the roller carts of the movable chassis are installed directly on the sidewalls of the heat exchange sections using height-adjustable supports fixed with clamps or magnets, and one of the guides used to move the main high-pressure hose under the action of the movement mechanism has a C-shaped a profile to limit the movement of the roller drive trolley of the movable chassis in a horizontal and vertical position using two pairs of rollers in both planes, respectively, and the second guide has a U-shaped or C-shaped profile to limit the movement of the support roll a wheeled chassis trolley having rollers which are installed in a vertical plane on a horizontal axis to prevent movement in a vertical plane, and the main high-pressure hose for supplying water to the spray nozzles is configured to move the movable chassis and supply water, while the flat jet spray nozzles are screwed into nipples with cap nuts for screwing onto the swivel elbows, which are also attached to the manifold by means of cap nuts, and the moving chassis movement mechanism consists of a drive profiled pulley with pressure rollers mounted on the output shaft of the explosion-proof chassis movement drive, mounted directly on the C-shaped rail and mounted on a mobile trolley, the chassis movement drive is equipped with a frequency converter for controlling the drive speed to change the chassis movement speed.

The technical result consists in minimizing the movement of service personnel along the finned surface of air coolers, making it possible to use the system for washing the heat exchange surfaces of air coolers with recirculation of heated air, simplifying and reducing the cost of the design, increasing the reliability of the system, reducing dead zones and increasing the efficiency of cleaning the finned surface. Air coolers, as well as providing the ability to clean the finned surface of air coolers of gas located in an explosive zone.

The figures show: Fig. 1 is a diagram of a system for flushing the finned surface of heat exchange tubes, FIG. 2 - mobile high pressure pumping unit, FIG. 3 - movable chassis (top view), Fig. 4 - injector mount, Fig. 5 - mobile cart.

The system for washing the finned surface of the heat exchanger tubes of air coolers (Figure 1) consists of a mobile high-pressure pumping unit 1 with a drum for winding a high-pressure hose, a movable chassis 2, a washing mobile carriage 3, two collectors 4 mounted on a washing mobile carriage, injectors 5 with flat jets for spraying water under high pressure, a guide 6 for a roller cart, a roller cart 7 of a rolling chassis, a drive 8 for moving the chassis (pusher of a high-pressure hose), a control panel 9, a mobile cart 10. The difference from the prototype is that that the reel for winding the high-pressure hose is located directly on the trolley of the mobile high-pressure pumping unit 1, and the mobile high-pressure pumping unit 1 itself can be made in an explosion-proof design. Also, the system for flushing the finned surface of heat exchange tubes of air coolers consists of sidewalls of heat exchange sections 11, height-adjustable supports 12 guides 6 and 16, a high pressure sleeve 13 that moves along the guide 6, a movement mechanism 14 that moves the high pressure sleeve and the movable chassis ( Fig.3). The movement mechanism is arranged, like the prototype, according to the type of cable pusher, but, unlike it, it has a different mover and placement on the apparatus; Two pairs of rollers 15 that position the roller trolley 7 in the guide 6 during movement. The system has a guide 16 that keeps the movable chassis (Figure 3) from moving in a vertical plane, a roller 17 and union nuts 18, which allows you to orient the sprayed water jet parallel to the ribs . Unlike the prototype, the through angles are attached to the manifolds 4 by means of union nuts, which makes it possible to set the nozzles 5 at the required angle for a particular tube bundle. The system also contains a profiled pulley 19, pressure rollers 20 and guide rollers 21.

Unlike the prototype, the high-pressure hose 13 is fed through the guide rollers 21 into the C-shaped guide 6 not by the drive tracks, but by the drive for moving the chassis 8 and the movement mechanism 14 along the heat exchange section of the air cooler, consisting of a profiled pulley 19 with pressure rollers 20 installed on the output the shaft of an explosion-proof motor-reducer, mounted directly on the C-shaped guide 6 and mounted on a special mobile cart 10. The drive pulley with pressure rollers has a design that allows you to quickly mount the high-pressure hose.

The mobile high-pressure pumping unit (Fig. 2) is mounted on a heavy-duty trolley 22 with front swivel wheels 23 and a brake 24 with a drum 25 installed on it for winding the high-pressure hose 13, with the possibility of supplying water to the high-pressure hose 13 through the axis of rotation of the drum 26 With this arrangement, only the control panel 9 (see Fig. 1) is placed on the air cooler service platform, and the high-pressure pump control cabinet 27 is placed on the heavy-duty trolley 22, which does not clutter up the passages and reduces the transition time from one air cooler to another. When flushing, the mobile pump unit 1 is located at ground level near or at a distance of the length of the high-pressure hose from the air cooler. Through the high-pressure hose 13, it supplies the flat jet nozzles with sufficient water volume and pressure to clean the fins of the heat exchange tubes. The water used for cleaning does not need to be heated and does not require cleaning additives. Mobile high-pressure pumping unit 1 can be made in an explosion-proof version, which will allow for the purification of air cooled gas in an explosive zone.

The movable chassis (Fig. 3) is a carrier beam 28 with a leading 29 and a support 30 roller trolley for movement along the heat exchange pipes along the guides 16 mounted on the sidewalls of the section. The guides fixed on the sidewalls of the section do not cover the heat exchange pipes from the action of cleaning water jets. Fastening the guides to the sidewall of the section using height-adjustable supports makes it possible to ensure the movement of the chassis with the washing carriage parallel to the heat exchange pipes, which are located with a slope towards the product outlet, while excluding non-parallelism of flat water jets to the fins of the heat exchange pipes. Thus, damage to the fins is excluded, the absence of shading of the interfin space is ensured, and the cleaning of the lower rows of heat exchange tubes is guaranteed.

A washing mobile carriage 3 is mounted on the beam 28, carrying two collectors 4 with flat jet nozzles 5. The collectors with nozzles are connected to the distribution manifold 31 through two high-pressure hoses 32. When cleaning the finned surface, the distribution manifold 31 is connected to the main high-pressure hose 13, which performs two functions: supplying the required amount of water under high pressure to the nozzles and moving the movable chassis along the guides using the chassis movement drive and the movement mechanism.

Screwing the flat jet nozzles 5 into the nipples 33 with union nuts 34 and fastening the through angles 35 to the manifold nipples 36 by means of the union nuts 37 (Fig. 4). allows optimal adaptation of the torch of each nozzle to the geometry of the tube bundle, which ensures high-quality cleaning of the interfin space of all rows of tubes.

The mobile cart (Fig. 5) consists of an explosion-proof drive for moving the chassis 8, a drive pulley 19 with pressure rollers 20. The explosion-proof design will allow cleaning the finned surface of the air cooler in an explosive zone. The structural simplicity and lightness of the mechanism allows it to be mounted directly on the rail, thereby not cluttering up the site or together with the control panel 9 on the mobile cart 10 next to the C-shaped rail, which simplifies the movement of the drive from one section to another when cleaning the AVO unit. To change the speed of movement of the chassis, a frequency converter is used, which regulates the frequency of rotation of the drive to move the chassis. The speed of rotation of the drive for moving the chassis is selected based on the degree of contamination of the finned surface of the air cooler.

The control panel 9, mounted on a mobile trolley 10, has an explosion-proof design and protection against dust and water IP 65. The control panel is equipped with connectors for connecting detachable power cables, controlling a gear motor: also a mobile pumping station.

The control panel has the following buttons to perform functions:

- buttons "forward", "back", "stop" to control the movement of the movable chassis;

- "start" and "stop" buttons for controlling a high-pressure mobile pumping unit;

- emergency stop button to disable the movement of the movable chassis and mobile pumping station;

- speed controller of moving chassis;

Cleaning the ribbed surface using the proposed washing system is as follows (Fig. 1).

On the sidewalls of the section or inside the upper air box (for air coolers with recirculation of heated air), guides for the movable chassis are installed. Moreover, for air coolers with recirculation of heated air, the guides are installed permanently, that is, they are integrated into the design of the upper duct.

A movable chassis with a washing movable carriage is installed on the guides.

The movable trolley with the movement mechanism and the control panel located on it is installed opposite the guide with the driving roller trolley of the movable chassis and fastened together.

A mobile pumping unit with a drum placed on it and the main high-pressure hose is located at ground level next to the block of air coolers to be cleaned. Next, a connection is made to the electrical supply network and to the local water supply system, which in turn must provide the minimum requirements for the normal functioning of the mobile pumping unit.

The control panel is connected to the drive for moving the chassis and the mobile pumping unit using detachable cables.

The main high-pressure hose is unwound from the drum of the mobile pumping station, passed through the guide rollers, laid on the drive pulley of the movement mechanism, fixed with pressure rollers and connected to the manifold on the drive roller trolley.

When the mobile high-pressure pumping unit is turned on, high-pressure water is supplied through the main high-pressure hose and the distribution manifold to the flat-jet nozzles of the washing mobile carriage, the spray jets of which are optimally adapted to the geometry of the tube bundle, thereby ensuring high-quality cleaning of the interfin space of all rows of heat exchange tubes. AVO section.

When the chassis movement drive is turned on from the control panel, the profiled pulley evenly, at a given speed, supplies the main high-pressure hose, rigidly connected to the chassis drive roller bogie, to the C-shaped guide, thereby moving the movable chassis with the washing mobile carriage along the finned tubes heat exchange section and cleaning of the part of the tube bundle that enters the spray jet of the nozzles. When the movable chassis reaches the end position at the beginning and at the end of the heat exchange section of the air cooler, the limit switch is activated, which stops the movable chassis.

After the movable chassis stops, the washing movable carriage is moved across the heat exchange pipes to the next position and the chassis movement drive is switched on again. The moving mechanism will evenly, at the same predetermined speed, pull the pressure hose rigidly connected to the driving roller carriage of the movable chassis from the C-shaped guide, thereby carrying out the reverse movement of the movable chassis with the washing movable carriage along the heat exchange pipes and cleaning the next part of the pipe beam. The movement of the movable chassis also occurs before the limit switch is activated.

The cycle is repeated until the entire area of the heat exchange surface is covered by the spray jet of flat jet nozzles.

When using copiers, the lateral movement of the washing carriage after each cycle can be carried out automatically.

The chassis movement speed is set by a switch from the control panel, depending on the degree of contamination of the finned surface of the AVO heat exchange section.

After completion of the washing of the heat exchanger section of the air cooler, the movable chassis, together with a mobile trolley, with removable guides (not applicable to stationary guides) is moved to another heat exchange section of the air cooler.

The advantages of the flushing system for the finned surface of heat exchange tubes of air coolers are as follows:

- the minimum number of movements of the service personnel along the finned surface of the heat-exchange tubes of the air cooler;

- the possibility of installing a portable system on air coolers equipped with hot air recirculation boxes;

- simplification and cost reduction of the design;

- increasing the reliability of the system;

- the arrangement of the mechanism for moving the movable chassis by the type of cable pusher, fixed directly on the C-shaped guide or mounted on a mobile trolley, and consisting of an explosion-proof movement drive, allows cleaning the finned surface of the heat exchange sections of the air cooler in the explosive zone;

- use of high-pressure flat water jets to remove contaminants;

- use for water purification without its heating and cleaning additives;

- installation of height-adjustable guides on the sidewall of the heat exchange section, which makes it possible to exclude jamming of the movable chassis when moving along the heat exchange tubes and ensures that the flat jets are parallel to the plane of the fins, which eliminates deformation of the latter;

- the location of the guides directly on the sidewall of the sections excludes areas that are inaccessible for cleaning the movable chassis with a washing mobile carriage on which the manifold with nozzles is fixed, and the method of their attachment allows the nozzle torch to be maximally adapted to the geometry of the tube bundle fins in order to effectively clean the areas between the fins of all rows heat exchange pipes;

- the use of a frequency converter of the chassis movement drive allows you to set the required speed of movement of the movable chassis along the heat exchange section of the air cooler, depending on the degree of contamination of the finned surface of the tube bundle.

Claims (1)

Washing system for the finned surface of heat exchange tubes of air coolers, consisting of a mobile pumping station with a drum for winding the main high-pressure hose, a movable chassis with a washing mobile carriage, on which two collectors with flat jet nozzles for spraying water under high pressure, two guides for roller carts of the movable chassis, chassis movement drive, mechanism for moving the main high-pressure hose, control panel, characterized in that the mobile pumping station is installed on swivel wheels equipped with brakes, with the ability to move and lock to a place convenient for work, while the drum for winding the main high-pressure hose is located directly on the heavy-duty trolley of the mobile pumping station with the possibility of supplying water to the high-pressure hose through the axis of rotation of the drum, and the high-pressure pump has a safety valve, protection against t overload and dry-running protection in the form of a pressure switch to control the water supply at the inlet, while a two-stage water filtration system is installed at the pump inlet, system components located for operation in an explosive area have an appropriate type of explosion protection, and guides for roller carts of the movable chassis are mounted directly on the sidewalls of the heat exchange sections using height-adjustable supports fixed with clamps or magnets, and one of the guides used to move the main high-pressure hose under the action of the movement mechanism has a C-shaped profile to limit the movement of the roller driving trolley of the movable chassis in horizontal and vertical positions with the help of two pairs of rollers in both planes, respectively, and the second guide has a U-shaped or C-shaped profile to limit the movement of the chassis support roller carriage, which has rollers that are installed in a vertical plane on the horizontal the ontal axis to prevent movement in the vertical plane, and the main high-pressure water supply hose to the spray nozzles is designed to move the movable chassis and supply water, while the flat spray nozzles are screwed into nipples with union nuts for screwing onto the elbows that are attached to to the collector also by means of union nuts, and the mechanism for moving the movable chassis consists of a drive profiled pulley with pressure rollers, mounted on the output shaft of the explosion-proof drive for moving the chassis, fixed directly on the C-shaped rail and mounted on a movable cart, the chassis moving drive is equipped with a frequency converter for frequency control rotation of the drive to change the speed of movement of the chassis.

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