RU2756088C1 - Installation for mixing and applying protective composition to the inner surface of pipelines - Google Patents

Abstract

FIELD: chemical equipment.

SUBSTANCE: invention relates to the field of chemical equipment and can be used in the manufacture, repair, scheduled maintenance of pipelines for both domestic and industrial purposes, requiring the application of a protective, in particular anticorrosive, coating. The mobile installation for mixing the components of the mixture and the subsequent application of the resulting mixture to the inner surface of the pipelines is characterized by the fact that it is mounted on a frame with wheels and includes two symmetrically arranged feeding circuits, each of which is connected to a corresponding container equipped with covers with seals, for the possibility of feeding the components of the mixture A and B into them, while the bottom of each container is flat and has a slope towards its intake opening, provided with an outlet pipe with a ball valve installed on it from the outside of the container, at the same time, heating plates are installed under the flat bottom of each container for automatic heating of the containers, and sensors are installed in the lower part of the containers to control the temperature of the components; the above-mentioned outlet pipe of each tank is connected to its own mesh filter-mud trap, the outlet of which is connected to the corresponding receiving chambers of piston pumps with a common pneumatic drive, while a heating cable is installed on the cylinder of each of the pumps, a pressure gauge is installed at the outlet of each of the pumps, which is connected by a high-pressure hose with a three-way tap, made with the possibility of feeding the corresponding component of the mixture either back into the container, or further into the common mixing chamber of the components of the mixture, in which a static mixer with a high-pressure hose is installed, which is a feeding hose, at the end of which a centralizer with a spray head is installed for the possibility of entering it into the pipeline and applying the resulting composition to the inner surface of the pipelines; in this case, the installation is equipped with a flushing system from the components of the mixture, including a piston pump with its own pneumatic drive, connected by the high-pressure hose with the three-way tap with the possibility of supplying flushing liquid through it to the common mixing chamber of the components of the mixture with a static mixer.

EFFECT: invention provides the creation of a more convenient installation design that combines the functions of mobility and reliability, has a smaller mass and dimensions, making it possible to obtain a homogeneous mixture, as well as the possibility of its application in pipelines with a diameter of 80 mm and passing the turn angles of the pipeline up to 90°.

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Description

Technology area

The invention relates to the field of chemical equipment and can be used in the manufacture, repair, scheduled maintenance of pipelines, both domestic and industrial, requiring the application of a protective, in particular, anti-corrosion coating.

State of the art

In the prior art, various types of devices are widely represented that produce mixing of various compositions, solutions, which are subsequently used as protective coatings on surfaces of various materials.

In particular, devices are known in which the mixing of the components is carried out in a pipeline just before spraying; the components are supplied by a high-pressure pump through hoses. Each component is supplied with its own hose. The large dimensions of the unit for mixing and spraying components do not allow for pipeline turning angles over 30 °; there are also restrictions on the diameters of the pipelines being repaired (usually at least 150 mm).

From the patent RU 2429056 C2, 20.09.2011, B01F 5/00, a device is known for mixing at least two separate streams of components, which, when mixed, form a combined flow of a fluid medium, while the device contains: a first channel made with the possibility of communication with one of at least two separate streams; a second channel configured to communicate with another of at least two separate streams; a porous mixing element communicating with each of the first and second channels, comprising a three-dimensional lattice structure forming a plurality of tortuous interconnected through channels, the porous mixing element having the physical characteristics for satisfactory mixing of the streams of the components of the combined fluid stream, said characteristics comprising the selected one or more of the average flow pore size, thickness and porosity, the product of the average flow pore size, thickness and porosity of the porous mixing element being within the range of about 0.016 to 0.055.

From the patent RU 2635800 C1, 11/16/2017, B01F 5/10, a mobile installation for preparing a solution of a binary mixture for thermochemical treatment of an oil and gas reservoir is known, containing a funnel for feeding dry powdery material, a circulation pump, a blending tank for mixing powdery material and water with stirring devices, a supply tank associated with it, a device for heating the circulating liquid, a system for monitoring and controlling the solution preparation process and a pipeline system, while the circulating pump is made in the form of a two-phase mixer pump with a centrifugal wheel and a crusher installed at its inlet, a funnel for feeding dry of powdery material is installed at the inlet to the crusher, the balancing tank is divided by an overflow partition, forming an inlet chamber connected to the outlet of the circulation pump and equipped with a filtration compartment, and an outlet chamber connected to the inlet to the supply container, while in each of the chambers of the mixing tank is installed along a mixing device, and the device for heating the circulating liquid includes a glass installed in the filtering compartment of the inlet chamber with a coil placed in it, as well as an additional heating element and a steam line installed on one of the walls of the mixing tank, which can be connected with a steam generating unit, while the unit is equipped with a unit for feeding dry reagents into the solution, including microdispensers and an ejector mixer connected by a passive inlet with microdispensers, and an active inlet with a supply tank, and a unit for feeding liquid reagents into the solution.

From the utility model patent RU 88061 U1, 10/27/2009, mobile equipment for the preparation of a solution is known, including equipment for transporting dry powdery material, equipment for preparing a mixing liquid and a solution, a system for monitoring and controlling in real time the process of preparing a solution, quick-disassembly piping with shut-off and control valves, and the equipment for transporting dry powdery material is equipped with a compressor, receiver, special pneumatic funnel and pipeline, and as an option - a tee with gas taps, receiver with gas taps and quick couplings, a pipeline system with quick couplings. At the same time, the real-time monitoring and control system includes primary sensors for density, level, volume and temperature, a light information display and an autonomous unit for collecting, processing, visualizing and documenting measurement information on equipment for preparing a mixing liquid, primary sensors for density, level, volume, temperature, mixing liquid flow rate, dosing screw rotation frequency, light information boards and an autonomous unit for collecting, processing, visualizing and documenting measurement information on the equipment for solution preparation.

From the patent RU 2223815 C1, 20.02.2004, B01F 11/00, a system for preparing an emulsion is known, comprising a line of one component; a line of another component, including a filter, a dosing device; the emulsion line with the first hydrodynamic disperser, the output of which is connected to the input of the additional hydrodynamic disperser, and the line of one component and the line of the other component are connected to the first disperser, while the first disperser has a resonant frequency range of 0.5-15 kHz, and the additional dispersant has a resonance range frequencies 15-365 kHz.

From the utility model patent RU 7619 U1, 16.09.1998, B01F 3/00, a plant for emulsifying liquids with liquids is known, containing a container for the main raw material component with inlet and outlet nozzles, a mixer with liquid inlet and outlet nozzles and an additional raw material component inlet , a supply pump, the inlet of which is connected to the container for the main component of the raw material and to the outlet pipe of the mixer liquid, shut-off and control valves, while the installation is equipped with one or more containers for the additional component of the raw material with inlet and outlet pipes, and the outlet pipe of this container is connected to using the installed shut-off and control valves and a pump with an inlet pipe for an additional component of the mixer raw material, and / or with a liquid inlet pipe of the mixer, and / or using a shut-off and control valve with a pipeline connecting the mixer outlet pipe and the feed pump inlet pipe, in addition, the outlet of the supply pump is connected to the inlet of the liquid mixer. In addition, the installation is equipped with a mixing device, for example an injector, through which the outlet branch pipe of the container for the additional raw material component is connected to a pipeline connecting the mixer outlet branch pipe and the feed pump inlet branch pipe. The mixer is equipped with a heating system, consisting of a pipe system built into the central part of the body, connected to a heat source and a heating system for the bottom of the mixer, made in the form of an external casing that covers the bottom of the mixer body to form a steam space connected to the steam source.

From the patent RU 2627392 C1, 08.08.2017, B01F 3/00, a device for the production of a modified bitumen binder is known, including a container for mixing bitumen with modifying components with oil heating coils, thermal insulation, lining with galvanized metal sheets, a hatch, a screw for feeding modifying components and high-speed three-blade mixer with an electric drive, inlet and outlet pipes heated with thermal oil with ball valves for supply, delivery and / or circulation of bitumen, a mixture of bitumen with a modifying component and / or ready-made modified bitumen, sequentially connecting the intake pipe from the tank, an electric pump with an inverter for feeding the bitumen mixture with a modifying component into a colloid mill, a colloid mill and a discharge pipe into a container, and an electrical control system, as a colloid mill contains a passive hydrodynamic disperser with a variable section channel in a sealed case for accelerating and decelerating the bit mixture mind with a modifying component and a device in the form of rods, causing cavitation when it flows around the specified mixture, made heated, a bitumen filter installed between the tank and the pump, a bitumen temperature control sensor installed on the tank wall below the bitumen filling level, and a bitumen pressure control sensor with a separating membrane installed at the inlet to the disperser, a unit for washing the disperser as part of a tank for washing oil and an oil pump, connected by pipes to the inlet and outlet of the dispersant through three-way valves to ensure that the disperser is flushed with an oil flow in the direction opposite to the direction of flow through the disperser in the bitumen modification cycle , as well as a mixer with an electric drive in the form of a paddle device in a cylindrical outer casing with the intake of a mixture of bitumen and modifier from the upper layers of the modified bitumen and moving them to the bottom of the container.

A common disadvantage of these devices is their limited functionality, both in terms of the operations performed and the conditions of use.

In comparison with such devices, the claimed installation has only a spray head mounted on the centralizer in the pipe; the already mixed polymer composition ready for spraying is supplied to the spray head through one hose. The centralizer and the spray head are small in size, which allows to pass all angles of pipeline rotation up to 90 °, the diameter of the pipelines being repaired is from DN80 mm to 1400 mm and more.

The technical problem to be solved by the present invention is to create a device that expands its functionality by combining the function of mixing and applying the resulting composition to the inner surface of the pipeline.

Disclosure of the essence of the invention

The problem posed is solved due to the fact that a mobile installation for mixing the components of the mixture and the subsequent application of the resulting mixture to the inner surface of the pipelines, according to the invention, is installed on a frame with wheels and includes two symmetrically located supply circuits, each of which is associated with a corresponding container, equipped with covers with seals, for the possibility of supplying them with the components of the mixture A and B, while the bottom of each container is made flat and has a slope towards its intake hole, equipped with an outlet pipe on the outside of the container with a ball valve installed on it, while under a flat at the bottom of each tank, heating plates are installed for automatic heating of the tanks, and sensors are installed at the bottom of the tanks to control the temperature of the components; the above branch pipe of each tank is connected to its own strainer-strainer, the outlet from which is connected to the corresponding receiving chambers of piston pumps with a common pneumatic drive, while a heating cable is installed on the cylinder of each pump, a pressure gauge is installed at the outlet of each pump, which is connected by a hose high pressure with a three-way valve, made with the possibility of supplying the corresponding component of the mixture either back to the container or further into the common mixing chamber for mixing the components of the mixture, in which a static mixer with a high pressure hose is installed, which is a supply hose, at the end of which a centralizer with a spray head is installed for the possibility of entering it into the pipeline and applying the resulting composition to the inner surface of the pipelines; the installation is equipped with a system for flushing from the mixture components, including a piston pump with its own pneumatic drive, connected by a high-pressure hose with a three-way valve with the possibility of supplying flushing liquid through it to the common mixing chamber of the mixture components with a static mixer.

The installation contains a control panel, made, in particular, with the possibility of adjusting the heating temperature of components in containers, indicating the temperature of components in tanks, heating high pressure hoses, pumps, switching on and changing the direction of rotation of the sprayer, changing the mode of supply of components, and also with the ability to regulate the operation flush pump.

In addition, the problem posed is solved by the method of mixing the components of the mixture using the above installation, according to which components A and B of the mixture are separately fed through the corresponding supply loop into heated containers equipped with sensors for controlling the temperature of the components of the mixture, then through the appropriate filter-dirt traps, where the components are cleaned from solid particles, and through the piston pump chamber, the mixture components are fed into the common mixing chamber of the mixture components, with installed in it

a static mixer, where components A and B are mixed, with the formation of a single mixture, and the subsequent supply of the formed mixture through the outlet of the mixing chamber into the supply hose equipped with a centralizer with a spray head.

The problem is also solved by the method of applying the mixture obtained by the method described above to the inner surface of pipelines using the above-described installation, according to which the resulting mixture is introduced into a supply hose equipped with a centralizer with a spray head, after which the centralizer is moved inside the pipeline and the specified mixture on its inner wall.

The technical result of the invention is the creation of a more convenient design of the installation, combining the functions of mobility and reliability, having a lower weight and dimensions, allowing to obtain a homogeneous mixture, as well as the possibility of its application in pipelines with a diameter of 80 mm and passage of pipeline rotation angles up to 90 °.

Implementation of the invention

In this section, a preferred embodiment of the invention will be given, which, as it is understood by a person skilled in the art, does not exclude other possible variants clearly arising from the essence of the claimed invention.

The components of the polymer composition are mixed in a mobile unit. The polymer composition consists of Component A - and Component B - hardener.

Component A is, for example, epoxy-diane resin, component B is a hardener, which is a composition: a mixture of technical polyethylene polyamines, plasticizers, fillers, which are used, for example, a mixture of technical polyethylene polyamines, plasticizers, fillers, which are used, for example microcalcite, flotation reagent, technical polyethylene polyamines, di-n-butyl ether of orthophthalic acid, pigment titanium dioxide, silicon dioxide, dibutyl phthalate.

The polymer composition is used for anticorrosive protection of the inner surface of pipelines used for various purposes.

The operating temperature of the composition is from minus 60 ° C to plus 130 ° C.

Before use, the components of the polymer composition are poured into the containers of the mobile mixing unit. In containers, the components are heated to 30 degrees. Simultaneously with heating for 20 minutes, the components are mixed in recirculation mode. Upon reaching the specified parameters, the components acquire the necessary fluidity for mixing. Components A and B are mixed in a 1: 1 ratio through a static mixer, and then the finished mixture is applied to the surface of the pipeline through the spray head. The polymerization time of the finished mixture at an ambient temperature of +20 degrees and more is 1 hour, the time for complete curing is 7 hours.

The unit performs the functions of preparing and mixing the components, after which the finished two-component polymer composition is fed into the pipeline:

- components "A" and "B" are poured into containers (tanks) equipped with heating, with a volume of 20 liters each;

- components are heated in containers to temperatures from +35 to + 50 ° C (depending on the ambient temperature), when heated, they are recirculated (mixed) in order to uniformly heat the components throughout the volume of containers (tanks);

- after heating the components to the required temperature, they are mixed in a static mixer and the finished polymer composition is fed through a hose to the sprayer;

- the supply of the polymer composition is made by two pumps from one pneumatic drive;

- after work, the hoses and the static mixer are flushed with flushing liquid, which is supplied by a cleaning pump with its own pneumatic drive;

- purging the flushing fluid from the mixing machine and hoses.

The plant has two symmetrical circuits for supplying components: one for component “A”, and one for component “B”, which are subsequently connected in front of a static mixer, in which the components are mixed in a 1: 1 ratio.

The components of the polymer composition are poured into containers (tanks) with a volume of 20 liters. each. Rectangular tanks are mounted on a frame with wheels for easy movement of the machine and are equipped with sealed lids to prevent contamination of components. The frame is also equipped with fasteners for installing units and parts of the mixing machine (pumps, pneumatic drives, control panel, shut-off valves and process piping). At the bottom of the tanks, sensors are installed to monitor the temperature of the components. 400 W heating plates are installed under the flat bottom of the tanks for automatic heating of the tanks.

дюйма, расположенных на дне баков, компоненты по трубкам диаметром

дюйма поступают к фильтрам-грязеуловителям, в которых установлена сетка с ячейками 1×1 мм, не допускающая попадание твердых мелких частиц на прием насосов. Для возможности очистки фильтров перед ними установлены шаровые краны DN 3/4 дюйма, давлением 16 бар.From branch pipes with a diameter

in., located at the bottom of the tanks, components in tubes with a diameter of

inches go to the dirt traps, in which a mesh with 1 × 1 mm cells is installed, which prevents the ingress of solid small particles into the pump intake. For the possibility of cleaning the filters, ball valves DN 3/4 "are installed in front of them, with a pressure of 16 bar.

After the filters, the components enter the receiving chamber of the piston pumps. The piston diameter of the pump is 32 mm, the piston stroke is 120 mm, the cylinder volume is 95 ml, the maximum outlet pressure of the piston pumps reaches 250 bar. The pressure is monitored using pressure gauges. Both pumps are driven by a single pneumatic drive (model SC160-120-S, gear ratio 1:20), which, at an air pressure of 6 bar, delivers 5 l / min of components. A heating cable is installed on the pump cylinders.

After the pumps, through a high-pressure hose DN 3/8 ", PN 330 bar, the components are fed to 3-way valves DN 3/8", PN 400 bar, which can be switched back to the tanks or to the static mixer. Static mixers are used for mixing, heat transfer and dispersion of two-component materials that differ in their purpose. The products are mixed only due to the energy of the flow with the participation of fixed mixing elements, which contribute to the continuous separation and redistribution of the total flow over the cross section of the mixing channel. The energy required for mixing the media is supplied to the flow by means of pumps. In practice, static mixers are characterized by small footprint, low maintenance costs, ease of installation and exceptional reliability.

When switching the 3-way valves to the “recirculation” position, the components return to the appropriate container (tank), where they are gradually heated and mixed. When the taps are switched to the "run" position, the components flow through the check valves DN 3/8 ", PN 400 bar into the mixing chamber in which the static mixer is installed. The bottom of the chamber is made with an inclination and is equipped with an outlet connected through a branch pipe with a high pressure hose, at the end of which a centralizer with a spray head is installed to allow it to be introduced into the pipeline and apply the resulting composition to the inner surface of the pipelines.

After the static mixer, which, in particular, consists of 18 mixing segments, the final two-component polymer composition comes out, ready for use.

After the working process, it is necessary to flush the mixing machine; for this purpose, it is equipped with a special pump and technological piping.

дюйма, жидкость подается на прием поршневого насоса. Диаметр поршня насоса 22 мм, ход поршня 20 мм, объем цилиндра 8 мл, максимальное давление на выходе насоса 250 бар. Пневмопривод при давлении воздуха 6 бар обеспечивает подачу промывочной жидкости в объеме 1,2 л/мин.The flushing liquid is pumped out of a portable container (not included in the mixing unit). Through a filter installed at the end of the hose

inches, the liquid is supplied to the intake of the piston pump. Pump piston diameter 22 mm, piston stroke 20 mm, cylinder volume 8 ml, maximum pump outlet pressure 250 bar. The pneumatic actuator at an air pressure of 6 bar provides a supply of flushing fluid in a volume of 1.2 l / min.

From the pump outlet, through a hose DN 3/8 ", PN 330 bar, the flushing liquid enters the 3-way valves DN 3/8", PN 400 bar, after opening which, the liquid flushes the check valves and the mixing chamber with a static mixer.

Compressed air from the compressor is used to power the pneumatic drives of the component feed pumps and the flushing fluid pump. The hose from the compressor is connected to the compressed air connection. Further, an air pressure regulator is installed, combined with a built-in moisture-oil separator filter, as well as filtering small mechanical impurities. After the filter, air enters the pneumatic valves, through which air is supplied to the pneumatic drive of the pump for flushing fluid supply.

For the control and operation of the mixing plant, a control panel is installed. Switching on occurs with a switch. The temperature to which the components in the tanks will be heated is set.

Pumps for feeding components have two modes of operation: "dosing" and "continuous operation", the change of modes is made by a switch. In the "dispensing" mode, the components are dispensed in doses of 50 ml per click.

There are two switches on the control panel. One of which turns on / off the flushing pump, and the other switch changes the direction of rotation of the sprayer.

Two indicators are installed, one of which lights up when the switch is switched to the continuous operation mode, and the other indicator lights up when the spray gun is turned on with the switch in any direction of rotation.

The resulting two-component polymer composition is introduced into the supply hose of the installation equipped with a centralizer with a spray head, after which the centralizer is moved inside the pipeline and the specified mixture is applied to its inner wall. Due to the fact that the composition ready for spraying is fed into the spray head, the dimensions of the application device are reduced, i.e. it becomes more compact and convenient for use, and, thus, allows using the installation for applying the coating composition in pipelines, including those with small diameters - from 80 mm, and passing pipeline rotation angles up to 90 °.

The declared installation is characterized by a high pressure of the main pump for supplying components - 250 kgf / cm ² , which makes it possible to increase the length of the trenchless repair of the pipeline up to 120 m, the maximum flow rate of the composition of 5 l / min, and also allows to increase the speed of work on the application of the polymer composition. The power supply of the spray gun of the installation is 24 V, this allows installing a more powerful electric motor and, accordingly, eliminating possible stops of the spray head, this also affects the high quality of the formed coating due to the higher engine speed and, accordingly, the higher feed rate and dispersion of the polymer composition.

Claims (4)

1. Mobile installation for mixing the components of the mixture and the subsequent application of the resulting mixture on the inner surface of the pipelines, characterized by the fact that it is installed on a frame with wheels and includes two symmetrically located supply circuits, each of which is connected to a corresponding container equipped with covers with seals, for the possibility of supplying the components of the mixture A and B to them, while the bottom of each container is made flat and has a slope towards its intake opening, equipped with an outlet pipe on the outside of the container with a ball valve installed on it, while heating is installed under the flat bottom of each container. plates for automatic heating of containers, and sensors are installed in the lower part of the containers to control the temperature of components; the above outlet branch pipe of each tank is connected to its own strainer-strainer, the outlet from which is connected to the corresponding receiving chambers of piston pumps with a common pneumatic drive, while a heating cable is installed on the cylinder of each pump, a pressure gauge is installed at the outlet of each of the pumps, which is connected a high-pressure hose with a three-way valve, made with the possibility of supplying the corresponding component of the mixture either back to the container or further into the common mixing chamber of the components of the mixture, in which a static mixer with a high pressure hose is installed, which is a supply hose, at the end of which a centralizer with a spray a head for the possibility of entering it into the pipeline and applying the resulting composition to the inner surface of the pipelines; the installation is equipped with a system for flushing from the mixture components, including a piston pump with its own pneumatic drive, connected by a high-pressure hose with a three-way valve with the possibility of supplying a flushing liquid through it to a common mixing chamber for mixing the mixture components with a static mixer. 2. An installation according to claim 1, characterized in that it contains a control panel made, in particular, with the ability to adjust the heating temperature of components in containers, display the temperature of components in tanks, heat high pressure hoses, pumps, switch on and change the direction of rotation of the spray gun, changing the modes of supply of components, as well as with the ability to regulate the operation of the flushing pump. 3. The method of mixing the components of the mixture using the installation according to claim 1, characterized in that the components A and B of the mixture are separately fed through the corresponding supply loop into heated containers equipped with sensors for monitoring the temperature of the components of the mixture, then through the corresponding filters, dirt traps, where cleaning is carried out components from solid particles, and through the piston pump chamber, the mixture components are fed into the common mixing chamber of the mixture components with a static mixer installed in it, where components A and B are mixed with the formation of a single mixture, and the subsequent supply of the formed mixture through the outlet of the mixing chamber into supply hose equipped with a spray head centralizer. 4. A method of applying a mixture obtained by the method according to claim 3. on the inner surface of pipelines using the installation according to claim 1, characterized in that the resulting mixture is introduced into a supply hose equipped with a centralizer with a spray head, after which the centralizer is moved inside the pipeline and said mixture is applied to its inner wall.