RU148986U1 - MODULAR GAS DISTRIBUTION STATION - Google Patents

Abstract

The claimed utility model relates to the gas industry, is intended for the preparation and supply of gas to consumers and can be used in any sector of the national economy to supply enterprises, settlements and individual consumers with gas in the required volume with a certain pressure and odorization. The technical result is the creation of a compact design, made with the possibility of carrying out work in both manual and automatic modes, changing the layout of the station depending on the specific operating conditions and equipment used, as well as improving the convenience of assembly, commissioning and commissioning and operational work.

Modular gas distribution station with inlet and outlet taps, including blocks connected by pipelines under a common roof and installed on a single foundation: switching, control, odorization, made in the form of transportable block-boxes, as well as functional units: switching, gas purification, gas reduction, prevention hydrate formation, gas flow measurement, odorization of gas, preparation of pulsed gas and technological, power equipment, power supply systems, including autonomous, t lemechanics, communications, control of technological and power equipment, control and automation, electric lighting, lightning protection, protection against static electricity, electrochemical protection, heating and ventilation, burglar alarm, gas control and automatic sludge discharge, power equipment, tools and devices that provide standard operating conditions installed equipment and maintaining a microclimate inside the block boxes, protection from adverse environmental influences and unauthorized access stupid, moreover, it is located in a single block building formed by long-stacked prefabricated block boxes with high factory readiness and configured to attach additional block boxes to it without interruption of gas supply, while the block building is equipped with lifting equipment and is divided into compartments: technological , switching, control, odorization, control, preparation of the coolant, in which the technological, power equipment and functional units equipped with fasteners are installed Tammy serving for joining of pipelines made at the outer end walls block boxes, while in the process compartment has a gas purification unit, unit prevent hydrate formation, gas measuring unit, the gas flow limiting unit; in the switching compartment there is a switching unit, a pulsed gas preparation unit, a gas preparation unit for auxiliary needs; in the odorization compartment, the odorization unit and the condensate collection tank; the coolant preparation compartment is made in the form of an autonomous boiler room, and technological, power equipment and functional units are installed in the center along the long sides of the block boxes. 1 n.p.f., 8 s.p.f., fig.

Description

The claimed utility model relates to the gas industry, is intended for the preparation and supply of gas to consumers and can be used in any sector of the national economy to supply enterprises, settlements and individual consumers with gas in the required volume with a certain pressure and odorization.

Gas distribution stations (GDS) are a set of installations and technical equipment, measuring and auxiliary systems for gas distribution and regulation of its pressure. Gas distribution stations are included in gas distribution systems.

A gas distribution station is known from the prior art, consisting of two units - a technological and emergency alarm and control with an air gap between them, while the technological unit contains sequentially located switching units, an expansion chamber with a swirl, a condensate collector, a cleaning unit, a flow meter, a heating unit and gas reduction, a container for storing an odorant, an alarm and control unit contains a boiler for the preparation and supply of coolant in the gas heating unit, and the odorizer is installed on the outside of the technological unit above the outlet gas pipelines, while the heating unit is also a heater of the internal space of the technological unit (see patent No. 2079040 for the invention of the gas distribution station, filed on 08/16/1994, published 05/10/1997).

A known station containing an inlet and outlet gas pipelines, a switching unit, gas cleaning, heating and reduction units, including respectively filters, heat exchangers and gas pressure regulators and having at least two process lines, as well as an odorization unit, a gas metering unit and a control and control unit moreover, a diagnostic unit with acoustic sensors mounted on filters, heat exchangers, and gas pressure regulators is additionally introduced, while the diagnostic unit is connected to the monitoring and control unit ( m. №85606 patent for utility model "gas distribution stations," the filing date of 12.05.2009, published on 10.08.2009).

In addition, a gas distribution station is known, consisting of technological, odorization and automation units, station switching units, gas purification, hydrate formation, gas reduction, gas heating, heating, commercial gas flow measurement, autonomous power supply, gas extraction for own needs, gas odorization , monitoring and alarm systems, inlet and outlet gas pipelines, while it has a block box consisting of two compartments isolated from each other, which are equipped with separate moves from outside; the block box contains a supporting metal frame, an insulated fence, a roof, an external ground loop, discharge candles, breathing and blowing; in the block box there are isolated technological and control compartments (operator); in the technological compartment there is a gas preheating unit consisting of three taps and a single-gas tubular gas heater with two spiral tubes, a switching unit, three reduction units, each of which consists of a cutter and two identical working and reserve reduction threads, designed for 100 % throughput each, having a manual valve, pressure regulator, manual valve, gas flow metering unit, consisting of a gas meter, three taps and piping, purification unit gas flow from droplet liquid and mechanical impurities, consisting of two working and standby filter separators and piping, gas heating unit, consisting of two working and standby tubular one-way gas heaters, six taps and piping, odorization unit, consisting of a wick odorizer, two taps, a carbon filter and piping; in the control compartment (operator) there is a heating unit with piping, an alarm and warning unit, a workplace of the GDS operator, heating radiators are installed in the technological and control compartments connected to the heating unit by technological pipelines (see patent No. 28908 for utility model “Gas distribution station ”, Filing date 12/23/2002, published on 04/20/2003).

The closest technical solution to the claimed utility model is a gas distribution station, consisting of 1 to 4 units connected by technological pipelines from among the units: GDS, reduction, instrumentation, switching, odorization; switching stations of the station, gas purification, gas reduction, gas heating, commercial gas flow measurement, gas odorization, autonomous power supply, gas extraction for own needs and control and automation systems, communication and telemechanics, electric lighting, lightning protection, protection against static electricity, electrochemical protection, heating and ventilation, burglar alarm, gas control and automatic sludge discharge, gas heater, odorant vessel and condensate collector, unit for commercial flow measurement g for placed outside the blocks in an open area, and has from 2 to 8 block boxes transportable by road, rail, containing isolated compartments: technological, odorization, control, preparation of coolant, gas heating with road, rail, containing isolated compartments: technological, odorization, control, preparation of coolant, gas heating with shut-off devices or safety relief valves, switchings located on a single pound ente and under the general prefabricated roof, external ground loop, discharge candles, breathing and purging, easily ventilated areas in the walls, ceiling and roof of the gas distribution system, gas preheater before cleaning with shut-off devices, filter separators with an expansion chamber and a swirler located perpendicular to the entrance gas, redundant units for cleaning, flow metering, heating, redundant containers for odorant and condensate, odorizer with a pulse metering valve and a spray device installed in a heated room, unit ejection, gas preparation for own needs and inert gas reduction, suspension hoist, gas heater coolant circulation loop, heating system circulation loop, from 1 to 6 heating units for heating gas heaters and one for gas distribution heating, membrane expansion tank, waste tank, up to three safety valves of the heat supply system, a jumper between the gas heating circuit and the heating system circuit, a two-unit gas distribution station consists of a block box with compartments nologic and odorization, block box with control and preparation coolant compartments, three-block gas distribution system consists of a block box with control and preparation coolant compartments, four-block gas station consists of block box with odorization and switching compartments, block box with control compartments, block box with preparation of the coolant and block box with a technological compartment, six-unit gas distribution system consists of isolated compartments of odorization, control and preparation of the coolant, which are each located in a separate block box, heating compartments va gas switching and placed in one block boxing process compartment disposed in two block-boxes (see. patent No. 290557 for the utility model “Gas distribution station”, filing date November 20, 2002, published April 27, 2003).

The disadvantages of the known designs are due to the high complexity, significant time and material costs when assembling, commissioning and commissioning at the station's operating site, inconvenience of maintenance and repair work, as well as difficulties in increasing, if necessary, the volume of gas preparation and supply to consumers after installing the station.

The technical result, the achievement of which the claimed model is aimed, is to create a compact design made with the possibility of working both in manual and automatic modes, changing the layout of the station depending on specific operating conditions, equipment used and gas productivity, as well as improving convenience assembly, commissioning and operational work.

The specified technical result is achieved by the fact that a modular gas distribution station with inlet and outlet cranes, including blocks connected by pipelines under a common roof and installed on a single foundation: switching, control, odorization, made in the form of transportable block boxes, as well as functional units: switching, gas purification, gas reduction, hydrate formation prevention, gas flow measurement, gas odorization, pulsed gas preparation and technological, power equipment power supply systems, including autonomous, telemechanics, communication, control of technological and power equipment, control and automation, electric lighting, lightning protection, protection against static electricity, electrochemical protection, heating and ventilation, burglar alarm, gas control and automatic reset of sludge, supplying equipment, tools and devices that ensure standard operating conditions of the installed equipment and maintain the microclimate inside the block boxes, protection against adverse effects environmental actions and unauthorized access, according to the utility model, is located in a single block building, formed by long-stacked prefabricated block boxes and made with the possibility of attaching additional block boxes to it without interruption of gas supply, while the block building is equipped with a lifting device equipment and is divided into compartments: technological, switching, control, odorization, control, preparation of the coolant, in which the technological, energy technical equipment and functional units equipped with fasteners used to connect pipelines to the external end walls of the block boxes; in this case, a gas purification unit, a hydrate formation prevention unit, a gas measurement unit, and a gas flow restriction unit are placed in the technological compartment; in the switching compartment there is a switching unit, a pulsed gas preparation unit, a gas preparation unit for auxiliary needs; in the odorization compartment, the odorization unit and the condensate collection tank; the coolant preparation compartment is made in the form of an autonomous boiler room, and technological, power equipment and functional units are installed in the center along the long sides of the block boxes.

No technical solutions coinciding with the set of essential features of the claimed utility model have been identified, which allows us to conclude that the claimed utility model meets such a patentability condition as “novelty”.

The patentability condition "industrial applicability" is confirmed by the example of a specific implementation of the inventive gas distribution station.

The utility model is illustrated by drawings, where

FIG. - The general layout of the modular gas distribution station (GDS).

The inventive station consists of individual transportable blocks (block boxes) assembled at the factory, in which functional units, technological and power equipment are installed. Block boxes are assembled at the construction site of the gas distribution system, while they are mounted in the form of a single block building 1, divided by sealed partitions into separate compartments (rooms), in which the functional units are installed depending on their purpose. The block building is equipped with an insulating flange connection (IFS) located outside, an inlet shut-off valve with remote control and a means of cleaning the incoming gas stream from large mechanical impurities in the form of a tee with a grate. Partitions of the building are made of fireproof material. Each compartment is equipped with a separate entrance from the outside.

In the block building, openings were made for installation / dismantling works using truck cranes, and standard lifting equipment, such as hoists, was also installed. The block building is made with the possibility of attaching additional block boxes to it, which are docked on building structures, as well as on external maintenance-free process pipelines equipped with flange connections.

Each box is made in the form of a body container with a supporting frame and an outer casing made of three-layer wall and roof panels with insulation sheets placed between the outer and inner casing, while the panels are mounted on a frame made of metal, mainly steel pipes, including square section. The frame is supported by a base bearing frame, which is sewn up with a three-layer coating (floor), the upper and lower floor sheathing being made of a profile material, for example, a rolled corrugated sheet, and a non-combustible heat-insulating layer is placed between them. The upper floor sheathing is provided with an antistatic coating. In addition, a flame retardant is applied to the supporting structures of the block box to increase their fire resistance. Cable and ventilation ducts, cable entry blocks are made in the outer sheathing and floor, as well as embedded structures embedded inside the container and providing the possibility of installing and fixing engineering and functional equipment. The container is equipped with canopies, ladders, protective peaks. The roof of the container can be made removable, which provides the convenience of, for example, overhaul and / or installation / dismantling of large technological equipment. To improve performance at low temperatures, the roof is treated with anti-icing compounds. Before joining the block boxes, the outer transport side skin is removed.

The blocks that make up the station are joined together, as a rule, by the long sides, while the equipment installed inside the blocks is placed in the center and also oriented along long walls, which allows servicing the equipment from any side.

Maintenance-free process pipelines (jumpers), with which they connect the blocks to each other, are placed on the outer end panels of the blocks and fixed to them by means of flange connections.

In the standard version, the building-block 1 is divided into the following compartments: technological compartment 2, switching compartment 3, odorization compartment 4, control compartment (operator's) 5, coolant preparation compartment 6.

In the technological compartment 2 there is a gas purification unit 7 from mechanical impurities and dropping liquid, a hydrate formation prevention unit 8, a gas flow measuring unit 9, a reduction unit 10.

The gas purification unit 7 from mechanical impurities and dropping liquid, consists of at least two lines, one of which is a backup. Each cleaning line includes at least one cleaning step in the form of a filter separator 11, in a single housing of which the separating part is combined - a flow swirl, due to the creation of centrifugal forces in which large mechanical impurities and droplet liquid are separated from the gas stream, and filtering part (filter element), providing a certain degree of purification. If there is more than one cleaning step in the cleaning unit, each next step is set sequentially, with each subsequent step having a finer degree of cleaning than the previous one, and is carried out in coalescence mode. Filters-separators are equipped with a storage volume for liquid located in the lower part of the housing, and devices for measuring or signaling the upper level of the liquid, as well as devices for automatic drainage of liquid, consisting of a float chamber and a hydraulic valve. In this case, the float chamber controls the position of the hydraulic valve, which allows the discharge of fluid from the cumulative volume of the filter separator into the external condensate collecting tank, which is usually located outside the gas distribution station.

In the case of gas entering the cleaning unit 7 with a low or negative temperature, the accumulator volume of the filter-separator is heated due to the built-in coil through which the coolant enters and circulates from the heat supply system located in the coolant compartment 6. In addition, it is possible to use the cleaning lines installation of inlet valves with remote control, due to which, in case of reaching the maximum pressure drop across the filter-separator, it is carried out automatically some switching of cleaning lines from working to backup.

The working and reserve lines operate alternately (as the filter element becomes clogged).

The size of gas heaters is selected taking into account the required gas temperature at the outlet of the gas distribution system, the normal operation of the station, as well as the protection of equipment from icing.

The gas is heated in the heat exchanger due to the circulation of the intermediate heat carrier, heated in the preparation compartment of the coolant 6, which is connected by pipelines to the rest of the block boxes, while the preparation of the coolant takes place in an autonomous boiler house installed in the compartment 6, which contains at least one boiler. As the fuel for the boiler room, gas is used supplied from the gas preparation unit for own needs 12.

The coolant from the heating unit is fed into the heat exchanger, where heat is transferred to the heated gas, then the cooled coolant is fed back to the heating boiler through the return pipe for heating.

The coolant circuit is protected against ingress of high pressure gas by means of shut-off valves, as well as by automatically switching to a bypass or a backup line.

A temperature controller is installed on the return pipe of the coolant leaving the heat exchanger, which automatically regulates the circulation of the coolant in the gas heating circuit, and depending on the temperature of the gas at the outlet of the reduction unit 10, automatically limits or increases the flow of coolant.

The circulation system uses equipment, in particular adjustable pumps, the pressure of which can vary in proportion to the flow rate of the coolant or maintained at a constant level by adjusting the speed.

If gas with a low or negative temperature enters the GDS inlet, an additional gas preheating unit (not shown in the drawing) can be installed, which is placed after the inlet crane of the station.

When operating a gas distribution station at low temperatures, liquids with a low freezing temperature are used as a coolant.

If there is an external heating system at the GDS location site, it is possible either to replace the autonomous boiler room with a connection to this heating system, or to connect an external heating system to the boiler house additionally.

After cleaning, the purified and heated gas enters the hydrate formation prevention unit 8.

Hydrate formation is a process that occurs when gas temperature and pressure drops, which entails a decrease in the vapor pressure and moisture capacity of the gas, and, as a result, hydrates are formed, which are white crystals, similar to a snowy crystalline mass and consisting of one or several molecules gas (methane, ethane, etc.) and several water molecules.

When the gas pressure is reduced, its temperature decreases, which leads to the formation and deposition of solid crystalline hydrates on the surface of the valve and seat of the pressure regulators, as a result of which they stop working, which, in turn, can lead to a complete stop of the entire GDS.

The following methods are used as methods to combat the formation of crystalline hydrates: general or partial heating of the gas; local heating of the regulator housing; introducing methanol into the gas pipeline.

In the inventive design, the gas heating method is used. The hydrate formation prevention unit (heating unit) 8 consists of at least two lines, one of which is redundant, and each line is equipped with shell-and-tube gas-liquid heat exchangers, which have a number of advantages compared to others, namely : tube bundles are made of an anticorrosive material, for example, stainless steel, which enhances their protection against corrosion and erosion wear and destruction. Tube bundles and heat exchangers have compact overall dimensions, have insignificant hydraulic resistance for a given heat output due to the maximum optimization of heat transfer processes, in particular, due to the correctly selected number of tubes included in the bundle, the absence of stagnant zones in the water casing, and the creation of conditions for the maximum possible transverse flow around the tubes with the coolant. In addition, the water casing of the heat exchanger is designed for the maximum possible pressure of the heated gas. In case of depressurization of the tube bundle, an alarm is provided, as well as protection of the heating system from gas ingress, which is carried out using automatic devices.

When the tube bundle is depressurized, the redundant heating line is automatically introduced, which prevents interruptions in the gas supply to the consumer.

After the site for preventing hydrate formation 8, the gas is directed to the unit for measuring gas flow 9.

Depending on the performance of the gas distribution station, the number and location of the gas flow measuring unit (s) 9 are determined, which can be installed either in front of or after the reducing unit 10, or after the outlet valve of the gas distribution station, while it is possible to have a unit for measuring the total gas flow, placed in front of the reduction unit, as well as individual metering units designed for each consumer. It is possible to place the metering unit on the bypass line and on the candle lines.

The use of certain types of flow meters and calculators is determined depending on the specified accuracy of gas flow measurement.

When disconnecting valves with remote control are installed on metering devices, switching of lines from operating to backup is carried out automatically.

After the flow metering unit 9, the gas enters the reduction unit 10, designed to reduce the inlet pressure to a predetermined value and maintain it with the necessary accuracy.

Reduction - lowering the pressure of steam or gas using pressure reducing valves, gearboxes, valves and the like.

The reduction unit 10 includes at least two lines, one of which is a backup. Both reducing lines are equivalent both in the composition of the equipment and in throughput, which for each reducing line is equal to 100% of the maximum capacity of the gas distribution system. Both lines can be made according to one of the schemes: shut-off valves with remote control - shut-off device - reducing device - shut-off valves with manual or remote control or shut-off valves with remote control - control regulator - operating regulator - shut-off valves with manual or remote control. In addition, the reduction unit can be made with the possibility of automatic or remote control of gas flow and / or pressure, with the function of controlling the position of the rod in the valves, and is also connected to a turboexpander installation connected to it in parallel, which serves to generate electric power for the auxiliary needs of the gas distribution system, t .e. as a backup source of electricity. The number of reduction lines at gas distribution stations depends on the gas flow rate.

The gas used for its own and technological needs, after reduction, is subject to metering with automatic correction of temperature and pressure.

Switching compartment 3 is equipped with devices designed to shut off gas at the inlet and outlet of the gas distribution system and to relieve pressure from the gas distribution circuit.

In the switching compartment 3, a gas flow restriction (regulation) unit 13 can be placed in case of its execution on the basis of electrically operated butterfly valves. If the execution of the gas restriction unit 13 provides for the use of reducing devices, in particular pressure regulators or control valves with a pneumatic or electric actuator, then the unit 13 is installed in the technological compartment 2. However, for any design and location of the gas flow restriction unit 13, its operation is automatically controlled using the control unit connected to it (not shown in the drawing) in accordance with the specified software content.

The bypass line of the switching unit is equipped with an inlet - first (downstream) shut-off valve and a second valve for throttling, as well as gas control devices, while the bypass provides the given capacity of the gas distribution system.

In the switching compartment 3, a gas preparation unit for auxiliary needs 12 is mounted, equipped with at least two lines: working and reserve, in which combined high-speed pressure regulators and a unit for measuring gas flow for internal use are used. For GDS with high productivity or high output pressure, or used in climatic conditions with low temperatures, in front of the inlet valve of the station, additional units for cleaning, heating and reducing the gas pressure of the first stage are additionally installed (not shown in the drawing).

In addition, in the switching compartment 3 there is a site for the preparation of pulsed gas 14 with manual or automatic control. The manual pulsed gas preparation unit consists of a working and backup adsorbers, which are used as filter driers and switching valves with a manual drive (not shown in the drawing). The automatic gas impulse gas preparation unit includes a working and reserve adsorbers (filter driers) and switching valves with an electric drive and automatic control means.

The gas distribution station is equipped with an automatic control system (ACS) (not shown in the drawing), which allows the station to operate in the mode of telemetry, remote control and tele-signaling without the mandatory constant presence of maintenance personnel, as well as an automated control system (ACS) of the upper level. Self-propelled guns made on the basis of industrial controllers.

The technological scheme, the values of the monitored parameters, current information, as well as the archives and the status of the warning and alarm systems are displayed using the visualization tool, which is used, for example, as a computer monitor. ACS can be additionally equipped with an external and / or remote automated workstation of the operator (AWP). In addition, ACS provides for redundancy and connection of processors and information input / output modules. Using modern means of communication allows you to receive current information in real time, without distortion, which eliminates the human factor.

Convenient presentation of data increases the speed and quality of the operator. Modern systems for collecting and processing information allow you to store information in databases and automatically generate reports for the required periods, view information in the form of diagrams and tables, with reference to the area using geographic information technologies (electronic maps).

To give a characteristic smell to the gas supplied to the consumer, the GDS includes an odorization unit 15 located in the odorization compartment 4 and with the help of which the odorant is introduced into the GDS pipeline, and the odorant is introduced and refilled automatically. Odorization unit 15 is made on the basis of an automatic gas odorizer, which supplies odorant to the outlet gas pipeline in proportion to the gas flow rate with an accuracy of at least 5%, while the odorant flow rate is accounted for and possible emergencies are monitored. Odor leakage is also automatically monitored using Ethyl Mercaptan gas detection sensors located in the odorization compartment. In case of disabling automatic odorant feeding, odorization in duplicate manual mode is provided. The equipment included in the assembly is made of anticorrosive materials, in particular, stainless steel. Refueling of the odorant contained in the consumable tank from the odorant storage tank is automatic. The system for neutralizing or disposing of odorant vapor is made in the form of a deodorizer or ejector. To remove the odorant in the odorization unit 15, a nitrogen cylinder and reduction means are provided. Under the odorization unit 15, a pan of anticorrosive material is installed.

In addition, the gas distribution station is equipped with power supply, heat supply and ventilation systems. The power supply system provides power to the internal power consumers of the gas distribution system, depending on the reliability category of power supply they require, while the system can be additionally equipped with uninterruptible power supplies of inverter type, for example, rechargeable batteries, or backup stand-alone power supplies in the form of diesel, gas piston or turbine expansion units.

The heat supply system is used to prepare the coolant for technological needs and station heating. To enable the plant to start up and operate at low temperatures, additional electric heating of the functional compartments is possible. The contours (lines) of heat supply and heating can be divided.

The ventilation system provides for general exchange and emergency exhaust ventilation and is designed to maintain the required temperature and air exchange rates in the compartments of the building block 1. Lightning protection and protection against static electricity are provided at the station, as well as burglar alarms, air pollution control measures, and protection against adverse environmental influences, unauthorized access, electrochemical protection.

If it is necessary to increase the gas distribution capacity of gas distribution lines on the external pipelines connecting the block boxes, additional flange connections (not shown in the drawing) are provided in the form of a flange + flange plug, through which, as well as using building structures, additional block blocks are connected to the block building boxes without interruption of gas supply to the consumer.

The implementation of the utility model is confirmed by examples of specific performance.

Gas distribution station operates as follows.

High-pressure gas through the inlet gas pipe passes through an insulating flange connection located outside the block building 1, then through the inlet (first) shut-off valve with remote control and a means of cleaning from large mechanical impurities, made in the form of a tee with a grill. After that, gas flows along the straight section of the inlet gas pipeline along the long side of the switching compartment 3 to the outlet of this compartment. Considering that the incoming gas stream is unrefined, the straight-line implementation of the gas pipeline inlet allows efficient and reliable protection of the pipeline from erosion damage, which helps to increase the life of the equipment installed at the station. Then the gas through the external unattended section of the gas pipeline enters the purification unit 7 located in the technological compartment 2. The unattended section of the gas pipeline, made with the estimated number of turns made at a given angle, is attached to the functional compartments by means of flange connections, which improves not only the quality and speed installation and commissioning works directly at the construction site, but also, if necessary, expedite the replacement or repair of the pipeline. Performing a maintenance-free section of the gas pipeline with turns allows you to compensate for the voltage in the pipeline and reduce the possibility of water hammer. In the cleaning unit with the help of filter separators (FS) made in a single housing, the gas is cleaned of droplet liquid and mechanical impurities, while in the separation part of the filter, coarser cleaning is performed (the degree of cleaning is approximately 99% for particles with a size of 40 microns), in the filter - more subtle. The separator is a vertical annular chamber located perpendicular to the flow of incoming gas and equipped with guide vanes that facilitate swirling of the flow. Due to centrifugal forces and speed loss, impurities are discarded to the inner surface of the separator and settle on the storage section. To minimize the entrainment of the separated particles by the gas stream, a flare conical cover is provided, and before the gas stream enters the filter, its direction of movement is changed by 180 °. The filter is made of polymeric materials that are resistant to aggressive impurities and have coalescing properties. The design of the filter element is made with the possibility of removing it from the filter-separator housing for the purpose of replacing or cleaning, as well as monitoring the differential pressure. In addition, it is additionally provided for the possibility of monitoring the liquid level in the storage part of the filter separator and the automatic discharge of this liquid into the condensate collection tank. As a device for automatic condensate discharge, a float chamber is used to monitor the liquid level, and a hydraulic valve is an actuator for liquid discharge, while the level and discharge control system works autonomously, regardless of the ACS of the station.

After cleaning, the gas stream enters the hydrate formation prevention unit (heating unit), which consists of a working and backup gas-liquid heat exchangers with automatic shut-off devices in the form of safety shut-off valves (PEC) installed at the gas stream inlet-outlet and protecting the heating system from gas breakthrough in case of depressurization of the tube bundle. When gas enters the heat exchanger and a corresponding increase in pressure, a safety relief valve is activated, located on the FFP housing and connecting it to the atmosphere, while a pressure differential is created between the control and operating cavities of the FFP, due to which the piston begins to move, which closes the supply and exhaust pipelines, and thereby prevents the ingress of gas into the heating system.

Maintaining a constant value of the gas flow temperature at the outlet of the gas distribution system occurs due to the placement of a three-way control valve with an electric actuator on the coolant supply line, which is controlled by the automatic control system of the gas distribution station according to the signal received from the temperature sensor installed on the gas outlet pipe. In case of exceeding the set temperature, the control three-way valve reduces the flow cross-section of the pipeline for the coolant at the outlet to the heat exchangers and at the same time increases the flow cross-section for discharge into the return pipe of the hot water boilers, which reduces the temperature at the outlet of the gas distribution system and sets the operation of the burners of the hot water boilers to lower power mode while reduced fuel gas consumption.

After the hydrate formation prevention unit, the gas enters the gas flow metering unit to determine the volume of gas supplied to the consumer with a given (certain) accuracy. The assembly can be implemented on the basis of various primary transducers, for example, constricting devices, ultrasonic flow meters, turbine, vortex meters, etc.) and automatic calculators connected to them, ensuring the flow rate and the volume of gas passed through the flowmeter to standard standard conditions, and also maintaining relevant archives and communication with various devices, for example, chromatographs, self-propelled guns, etc.

After the metering unit, the gas passes to the reduction unit, due to which the gas is supplied to the consumer at a given pressure, this pressure is maintained with the necessary accuracy, as well as protection against unacceptable pressure increase in emergency situations. Gas reduction is carried out using pressure regulators with integrated silencers (noise level not more than 80 dB). Overpressure protection is achieved through the use of, for example, shut-off valves that block the gas flow when its pressure is increased. Switching of the reduction lines in case of failure of the pressure regulator is carried out in automatic mode by opening or closing the inlet taps equipped with remote control.

After reduction, the gas returns to the switching unit, passes to the consumer through the output (second) shut-off valve, the bypass connection unit, the pulsed gas preparation unit, the odorant input unit, the flow restriction unit, the insulating flange connection.

The pulsed gas preparation unit is designed to clean from mechanical impurities and remove water vapor (deep drying) from natural gas before it is used by the consumer to control shutoff valves at oil and gas facilities.

The use of bypass in automatic devices - a function that allows you to switch the input signal directly to the output, bypassing all functional blocks, allows you to deliver gas to the consumer when the input and output shut-off valves are closed, which increases the reliability of gas supply in case of emergency.

In the case of automatic gas distribution, the bypass is as follows: a remote-controlled (automatic) control valve installed at the inlet — an automatic reducing device — a hand-operated crane. In this case, when the input and output valves of the gas distribution system are turned off, the bypass valve automatically turns on, and the automatic reducing device ensures uninterrupted gas supply to the consumer with a given output pressure. If during the gas supply to the consumer there is no stage of cleaning and heating, then as an automatic reducing device, a control valve with an electric actuator and heating the casing is used, while the electric drive is controlled by the automatic control system of the gas distribution station according to the signal received from the pressure sensor installed on the outlet gas pipeline, and the casing is heated control valve - from the heating system of the station.

The advantages of the claimed station are that the equipment is located in block boxes that protect it from the effects of atmospheric precipitation, solar radiation and unauthorized access, while the block boxes are a product of high factory readiness, providing for accelerated installation and commissioning on site. The internal layout of the block boxes provides unimpeded access to all components and parts of the block to enable revisions or repairs. The number of blocks and the type of block building are determined by the capacity of the GDS.

All functional block-boxes are located in a single block-building, which significantly reduces the area occupied by the gas distribution station, the volume and time of work performed, eliminates the installation of external inter-unit communications, and reduces operating costs. Placing equipment in heated boxes involves two-way maintenance. The removal of maintenance-free interblock connecting elements to the outer end sides of the block boxes allows you to unlimitedly increase the technological scheme depending on the performance of the gas distribution system, connecting additional nodes, backup equipment, and equip additional gas outlets to consumers inside a single building without stopping gas supply to the consumer.

Claims (9)

1. Modular gas distribution station with inlet and outlet taps, including blocks connected by pipelines under a common roof and installed on a single foundation: switching, control, odorization, made in the form of transportable block-boxes, as well as functional units: switching, gas purification, gas reduction prevent hydrate formation, measure gas flow, odorize gas, prepare pulsed gas and process, power equipment, power systems, including autonomous ones, telemechanics, communications, control of technological and power equipment, control and automation, electric lighting, lightning protection, protection against static electricity, electrochemical protection, heating and ventilation, burglar alarm, gas control and automatic sludge discharge, power equipment, tools and devices that provide standard operating conditions installed equipment and maintaining a microclimate inside the block boxes, protection against adverse environmental influences and unauthorized use stupa, characterized in that it is located in a single block building, formed by long-stacked prefabricated block boxes and made with the possibility of attaching additional block boxes to it without stopping gas supply, while the block building is equipped with lifting equipment and is divided into compartments: technological, switching, control, odorization, control, preparation of the coolant, in which technological, power equipment and functional units equipped with with reference elements used for connecting pipelines to the external end walls of the block boxes, while the gas treatment unit, the hydrate formation prevention unit, the gas measurement unit, and the gas flow restriction unit are placed in the technological compartment; in the switching compartment there is a switching unit, a pulsed gas preparation unit, a gas preparation unit for auxiliary needs; in the odorization compartment, the odorization unit and the condensate collection tank; the coolant preparation compartment is made in the form of an autonomous boiler room, and technological, power equipment and functional units are installed in the center along the long sides of the block boxes. 2. The modular gas distribution station according to claim 1, characterized in that each functional compartment is made with a separate entrance. 3. The modular gas distribution station according to claim 1, characterized in that it is made with the possibility of manual and / or remote and / or automatic control. 4. The modular gas distribution station according to claim 1, characterized in that the equipment of the odorization unit is made of anticorrosive material. 5. The modular gas distribution station according to claim 1, characterized in that the purification unit and the hydrate formation prevention unit, the reduction unit, the gas preparation unit for auxiliary needs consist of at least two lines, one of which is a backup. 6. The modular gas distribution station according to claim 1, characterized in that the flow measuring unit is located before or after the reducing unit, or after the outlet valve. 7. The modular gas distribution station according to claim 1, characterized in that the pulsed gas preparation unit is made with manual or automatic control. 8. The modular gas distribution station according to claim 1, characterized in that the gas flow restriction unit is either based on standard reducing devices, for example, pressure regulators, pneumatic or electric actuated control valves, or electric actuated butterfly valves. 9. The modular gas distribution station according to claim 1, characterized in that the pipelines are additionally equipped with flange connections.

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