RU2656801C1 - External flushing system of gas air-cooling unit - Google Patents

Abstract

FIELD: aircraft engineering.

SUBSTANCE: invention relates to the cleaning of aircraft. External flushing system for the gas air-cooling unit (ABO) consists of a flushing device and a collector for external flushing with nozzles, a high-pressure installation, and a control panel. Flushing device is mounted on a mobile frame and is designed to prepare and deliver washing liquids. Flushing device comprises tank (8), multi-stage centrifugal electric pump (7), drum with hose (14). Control panel is located on the flushing device. Nozzles of the collector are designed to distribute washing liquids in finned tube surfaces. Collector can be made in the form of a trolley, moved manually in the heat exchange section or in the form of a stationary grid covering the entire area of the heat exchange section.

EFFECT: invention reduces the consumption of electricity and reduces the consumption of fuel gas.

8 cl, 1 tbl, 9 dwg

Description

The invention relates to a device for preparing and supplying a washing solution for washing an apparatus for gas air cooling (AVO) of gas in gas pumping, energy, and other industries.

Known installation of high pressure Karcher.

This analogue is used for external washing of heat exchange sections.

Flushing equipment consists of:

- high pressure apparatus;

- High-pressure hoses;

- Nozzles with nozzle.

Brief job description

The operator, holding a nozzle with a nozzle, moves along the heat exchange section, directing the jet at different angles into the gaps between the finned tubes.

Flushing is standard with water. In addition to the standard, there are other equipment configurations for washing - using washing solutions, using heating, using a steam jet, with nozzles of different spray angles.

The fluid on the nozzle with the nozzle is supplied by a high-pressure apparatus.

The Karcher high-pressure apparatus, unlike the claimed system, does not have a supply tank. Water is withdrawn by means of a suction hose from an external tank (from two tanks, if a washing solution is used).

The closest analogue of the claimed system is a flushing system AX-Services (France), which consists of:

- Cleaning trolley;

- guide rails;

- High pressure installations;

- A drum with a drive (with a high pressure hose);

- The control panel.

Brief job description

Guide rails are mounted on the heat exchange section, onto which a cleaning trolley with nozzles is installed.

The cart moves automatically along the rails along the rails. In the transverse direction, the trolley is rearranged manually. To flush one section, it is necessary to rearrange the cart several times.

The nozzles on the cleaning cart have flat spray torches. Torches are directed into the space between the finned tubes at certain angles.

The fluid is injected into the nozzles by installing a high pressure.

The high pressure installation, unlike the claimed system, does not have its own supply tank.

Water is taken from an external tank or from a water supply system. Water is supplied to the nozzles through a high pressure hose located on a drum with a drive.

Rinsing is done with water, without using a washing solution. Common elements with the claimed system:

- guide rails are a stationary analogue of the frame of the inventive collector for external washing;

- a cleaning trolley with flat spray nozzles is an analog of the inventive collector for external washing;

- installation of high pressure (complete with an external tank, an external drum and an external remote control) is an analogue of the inventive flushing device.

Comparison table of flushing systems:

*) Determined by the width of the heat exchange section

Another flushing system is known that is close in characteristics and operating principles to the AX-services system variant. Production of JNW CleaningSolutions GmbH, Germany. Website - www.jnw-cs.de.

The closest technical solution is the patent of the Russian Federation No. 2554188, decl. 06/08/2005, publ. 03/10/2012. This system consists of a flushing device and a manifold for external flushing with nozzles, a high-pressure unit, and a control panel.

The purpose of the claimed system

The tube bundle in the gas ABO is multi-row, but due to the high finning density, solid components in the air flow settle on the windward side of the finning of the first two rows of tubes (Fig. 1).

This leads to a decrease in the bore for the air flow and, as a consequence, to a reduction in air flow. To restore air flow, it is necessary to increase the cost of electricity to drive the fans, and to compensate for the loss of 10% of the air flow, the cost of electricity increases by 30% (Fig. 2).

The external gas flushing system (SNP) of the ABO gas is designed to remove contaminants from the outer surface of the tubes and from the annular space of the heat exchange sections of the ABO gas.

The approach and equipment used allow washing all rows of tube bundle tubes, including the two most contaminated lower rows.

The technical result of the use of SNP ABO gas from regular and effective flushing of ABO gas is expressed in a reduction in the cost of consuming auxiliary energy for driving ABO gas fans, saving operating costs by reducing fuel gas consumption.

External flushing system equipment

Equipment for external flushing of the ABO gas consists of: a flushing device for the preparation and supply of washing liquids, a manifold for external washing with nozzles for the direct distribution of washing liquids on the surfaces of the finned tubes.

As washing liquids, a slightly alkaline washing solution and water are used.

The flushing device is mounted on a supporting frame (1) with a frame (2). The frame design is designed to absorb static loads from installed equipment. A pair of rotary (3) and a pair of non-rotary (4) wheels of the required diameter are installed on the frame (1) for the convenience of moving the device over various types of hard coatings. A tow hitch (5) is provided for attachment to the tractor on the frame (1).

The required pressure and flow rate of the washing solution in the discharge pipe (6) at the outlet of the device provides a multistage electric centrifugal pump (7). The pump is equipped with a bypass line with a throttle washer.

The device is equipped with a 1250 liter supply tank (8), which is filled with washing solution or water, depending on the washing mode. The tank is equipped with a level sensor that sends a signal to turn off the pump when the liquid level in the tank drops below the minimum acceptable. A level gauge (9) is installed on the tank for visual control of the amount of liquid.

The piping kit includes filters and valves and provides:

- tank connection with a stationary pump;

- connection of a portable pump for filling the tank with a washing solution from barrels;

- connecting the sleeve of the water supply system for refueling the tank with water;

- draining fluid from the tank;

- fluid supply to the drum with a hose;

- mixing the liquid in the tank when preparing the washing solution from the concentrate and water. The design of the mixing line allows for minimal pricing.

A mesh filter (10) with a mesh size of 1 mm is installed on the section of the tank – stationary pump pipeline, which prevents foreign bodies from entering the pump’s working cavity. The used filter design on the flange clamps (11) significantly increases the convenience and reduces the time spent during the filter cleaning operation.

Additional fluid filtration is also carried out at the inlet to the collector for external flushing.

On the supply line of the washing solution, a full bore control ball valve (12) is installed, which allows you to adjust the pressure and flow rate of the supplied liquid. The feed line ends with a drum (13) with a hose (14) placed on it. The fluid is supplied to the drum through the axis of rotation of the coil. The drum handle is equipped with a stopper (15). The design of the drum significantly increases the usability of the device, reduces the time of preparation and completion of work.

The hose material is oil and petrol resistant rubber, resistant to the effects of the used cleaning solution. The hose ends with a quick connector (16), the counterpart of the connection is mounted on a manifold mounted on a flushed heat exchange section.

All the listed equipment of the device is placed in an airtight pan (17).

The device is connected to the ground and to the power source with the included cables.

The device is controlled from the control panel (18).

The flushing device is illustrated in FIG. 3 is a side view, FIG. 4 is a plan view. The numbers in FIG. 3, FIG. 4 are marked: 1 - frame, 2 - frame, 3 - swivel wheel, 4 - fixed wheel, 5 - tow hitch, 6 - discharge pipe, 7 - stationary pump, 8 - tank, 9 - level gauge, 10 - strainer, 11 - flange clamp, 12 - control valve, 13 - drum, 14 - hose, 15 - drum handle stopper, 16 - quick-connect fitting, 17 - pallet, 18 - control panel.

The manifold for external flushing is available in two versions.

The first version of the manifold for external washing is made in the form of a cart on rollers, manually moved along the guides along the entire length of the finned tubes of the heat-exchange section of the ABO gas. As guides, frame beams of the heat exchange section can be used. The cart consists of a frame (19), two supply pipes with nozzles (20), a handle for controlling the collector (21), a lever (22) with forks (23) for moving pipes with nozzles (20) vertically. The rollers (24) are mounted on the frame (16) and have restrictive flanges. The width of the wheelbase of the collector can be adjusted within ± 40 mm. A strainer (25) and a quick-connect connector (26) are installed on the inlet pipe of the manifold for connecting the flushing system hose. To control the pressure on the pipes with nozzles, pressure gauges are installed (27).

Nozzles supplying washing liquids on the surface of the finned tubes, the nests of the two manifold inlet pipes (20) are installed and directed into the gaps with finned angles α and α to the vertical.The value α is selected in accordance with the location of the finned tubes in the tube bundle. The number of nozzles on the supply pipes (20) provides a one-time supply of washing liquids over the entire width of the heat exchange section.

The nozzles have a flat torch with a spray angle of not more than 30 degrees, oriented perpendicular to the finning of the tubes (see Fig. 8). When the lever (22) is moved, the pipes with nozzles (20) move vertically, and the nozzle torches move in the transverse direction along the gaps between the fins.

The collector for external flushing of the first embodiment is illustrated in the figures: FIG. 5 is a front view, FIG. 6 is a plan view, FIG. 7 is a side view. The numbers denote: 19 - the frame, 20 - the pipe with nozzles, 21 - the handle for controlling the collector, 22 - the lever, 23 - the lever fork, 24 - the roller with the flange, 25 - the strainer, 26 - the quick connector, 27 - the pressure gauge.

The operation of the external flushing system with a collector of the first design

The flushing device is placed on a horizontal surface near the ABO, on which flushing is performed. The wheels are locked with brakes. The device must be earthed and connected to the electrical mains.

The device tank is filled with the required amount of washing solution concentrate (using a portable pump) and the required amount of water (from the water supply system). A washing solution is prepared by mixing the concentrate and water. The amount of liquid in the tank is controlled by a level gauge mounted on the tank. Through the mixing line, the concentrate of the washing solution is mixed with water for 20 minutes. After the mixing procedure, the mixture remains homogeneous and does not separate.

The manifold for external flushing is located on the heat exchange section above the tube bundle. Collector rollers rest on the longitudinal beams of the section walls. The nozzle torches are directed into the space between the finned tubes.

The flushing device hose is connected to the connector on the manifold.

Using the control panel and the corresponding shutoff valves of the installation, the operator switches on the fluid supply mode. There is a supply of fluid from the tank through a hose to the manifold.

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 exposure time, water is supplied. The pressure in front of the nozzles when supplying water is 20-22 bar.

When flushing, the operator moves the collector along the section at an average speed of 2-3 meters per minute. Simultaneously with the collector moving along the section, the operator moves with the lever, moving the pipes with nozzles vertically, and the nozzle flares in the transverse direction.

The second version of the collector for external flushing is used in those cases when it is impossible to flush with the collector of the first design due to the design features of the ABO gas (for example, if a block of blinds or fans is located above the heat exchange section).

The collector of the second design is a collection of tubes with nozzles (28) mounted stationary directly above the finned tubes of the heat exchange section. Tubes with nozzles (28) are fixed to the metal structures of the heat exchange section by sliding mounts (31) with a degree of freedom in the axial direction to eliminate thermal deformations. The fluid is supplied to the tubes with nozzles (28) through the inlet manifold (29), on which the quick-connect connector (30) is installed to connect the flushing system hose.

The nozzles of the collector during washing are stationary and have a full cone spray pattern with an angle of 90 ° -120 °. The number of nozzles on the pipes (28) allows the supply of washing liquids over the entire area of the heat exchange section.

The manifold for external flushing of the second embodiment is illustrated in FIG. 9. The numbers indicate: 28 — tube with nozzles, 29 — input manifold, 30 — quick-connect connector, 31 — sliding mount.

The operation of the external flushing system with a collector of the second design

The flushing device is placed on a horizontal surface near the ABO, on which flushing is performed. The wheels are locked with brakes. The device must be earthed and connected to the electrical mains.

The device tank is filled with the required amount of washing solution concentrate (using a portable pump) and the required amount of water (from the water supply system). A washing solution is prepared by mixing the concentrate and water. The amount of liquid in the tank is controlled by a level gauge mounted on the tank. Through the mixing line, the concentrate of the washing solution is mixed with water for 20 minutes. After the mixing procedure, the mixture remains homogeneous and does not separate.

The flushing device hose is connected to the connector on the collector mounted on the heat exchange section.

Using the control panel and the corresponding shutoff valves of the installation, the operator switches on the fluid supply mode. There is a supply of fluid from the tank through a hose to the manifold.

At the first stage, a washing solution is supplied. The pressure in front of the nozzles with a washing solution supply of 1-2 bar.

At the second stage, the tank is filled with water and, after the exposure time, water is supplied. Pressure before nozzles at water supply - 4 bar.

The technical result (technological effect) of the use of SNP ABO gas.

The technological effect of the regular and effective flushing of the ABO gas is expressed in the reduction of the cost of consuming auxiliary energy for driving the ABO gas fans, saving operating costs by reducing fuel gas consumption.

Claims (8)

1. The system of external washing of an air cooling apparatus (AVO) of gas, consisting of a washing device and a manifold for external washing with nozzles, a high-pressure installation, a control panel, characterized in that the washing device is configured to prepare and supply washing liquids, and the washing device mounted on a movable frame and includes a tank, a multistage centrifugal electric pump, a drum with a hose, while the control panel is located on the flushing device, and the nozzles collector The ras are made with the possibility of distributing washing liquids on the surfaces of the finned tubes, and the collector can be made in the form of a trolley, manually moved along the heat-exchange section or in the form of a stationary grating covering the entire area of the heat-exchange section. 2. The external flushing system according to claim 1, characterized in that the flushing device is connected to the manifold using a hose located on the drum, and the fluid is supplied to the drum through the axis of rotation of the coil, and the hose is connected to the manifold with nozzles by means of a quick connector. 3. The external washing system according to claim 1, characterized in that the washing device is equipped with a hook-on device for connecting to the tractor. 4. The external washing system according to claim 1, characterized in that the washing device is equipped with a strainer on quick-detachable flange clamps mounted on the supply line. 5. The external flushing system according to claim 1, characterized in that the flushing device tank is equipped with a level sensor that sends a signal to turn off the pump when the liquid level in the tank drops below the minimum acceptable. 6. The external washing system according to claim 1, characterized in that the washing device tank is equipped with a level gauge for visual monitoring of the amount of liquid. 7. The external flushing system according to claim 1, characterized in that the external flushing manifold is made in the form of a cart on rollers, manually moved along the guides along the entire length of the finned tubes of the ABO gas heat exchange section, the width of the wheel base of the collector being adjustable within ± 40 mm, and the collector rollers have restrictive flanges, while the liquid is supplied on the surface of the finned tubes over the entire width of the section by means of nozzles installed in the sockets of the two supply pipes of the collector and in the direction in the gaps between the fin tubes at angles of α and α to the vertical, determined by the location of the fin tubes in the tube bundle, the nozzles having a flat torch with a spray angle of not more than 30 °, oriented perpendicular to the fin of the tubes, nozzle torches can move in the gaps between the fin tubes due to the vertical movement of the supply pipes with nozzles. 8. The external flushing system according to claim 1, characterized in that the collector for external flushing is made in the form of a stationary grill mounted above the finned tubes of the heat exchanger section ABO, while the supply of liquids on the surface of the finned tubes is carried out by means of nozzles installed in the nests of the manifold distribution pipes and directed vertically downward, the nozzles have a full cone spray pattern of 90-120 ° and are located over the entire area of the heat exchange section, distribution pipes are fixed to the metal structures t the heat exchange section and the beams of the external washing system with sliding mounts with a degree of freedom in the axial direction.

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