RU2740239C1 - Inhibitor dosing unit - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: inhibitor dosing unit comprises a main line and a bypass line, the main line comprising a pipeline and a first ball valve, a filter, a second ball valve, a solenoid two-way valve installed in series on its stroke, third ball valve, check valve, pressure gauge, fourth ball valve, bypass line includes pipeline and in-series installed on its stroke fifth ball valve, throttle pack, sixth ball valve, wherein bypass line begins with first branch from main line between filter and second ball valve, ends with second branch between third ball valve and check valve, and in the area of the first and the second branches there installed are pressure sensors with possibility to determine pressure in the main pipeline.

EFFECT: device provides reliability, dosed supply of inhibitor.

4 cl, 5 dwg

Description

The device is intended for supplying the inhibitor to the pipelines of the gas gathering network of gas fields to prevent pipeline corrosion and hydrate formation.

Known methanol distribution unit, consisting of six nodes of the methanol distribution unit, four of which include six collectors equipped with valves. The methanol distribution unit is equipped with two control valves, two control valves with actuators, and a flow meter kit. The first and second nodes of the methanol distribution unit are connected by the free ends of the adapters with the flow meter set and the control valve flanges, the third and fourth units of the methanol distribution unit are connected by two free flanges to the control valve flanges with actuators, and the other two to the control valve flanges. The free ends of the tees of the first and second nodes of the methanol distribution unit are connected to the general field methane pipeline system and an automatic process control station. The device allows methanol to be supplied to two injection points (RU 2338237 C1, 10.11.2008).

A known system for distributing and dispensing a hydrate inhibitor contains a control unit, a common inhibitor supply line, a hydrate inhibitor, such as methanol, supply to the tubular space of the main wellbore, a hydrate inhibitor flow unit to the annular space of the lateral wellbore, installed on the common inhibitor supply line. The system provides control of the inhibitor flow rate (RU 138853 U1, 03/27/2014).

Technical problems are the lack of reliability of the known devices, inadequate ability to adjust the required amount of inhibitor feed.

The proposed BRM inhibitor dosing unit (PN 250, DN 8) (hereinafter referred to as the unit) is an integral part of the inhibitor supply system to the pipelines of the gas gathering network of gas fields to prevent pipeline corrosion, hydrate formation, and can also be used as an independent product.

The unit is designed for remote and (or) manual control of the inhibitor flow rate.

The inhibitor dosing unit includes a main line and a bypass line, the main line includes a pipeline and a first ball valve, a filter, a second ball valve, a two-way solenoid valve, a third ball valve, a check valve, a pressure gauge, a fourth ball valve, a bypass line installed in series along its course includes a pipeline and a fifth ball valve, a throttle package, a sixth ball valve installed in series along its course, and the bypass line begins with the first branch from the main line between the filter and the second ball valve, ends with a second branch between the third ball valve and the check valve, and in the area of the first and the second branches are installed pressure sensors with the ability to determine the pressure in the main pipeline.

The inhibitor is methanol.

The bypass line is made with the possibility of supplying methanol through it only when the second and third ball valves are closed.

The unit can be installed in a heating cabinet.

The technical results are:

- providing the function of dosed supply of the inhibitor to the pipelines of the gas gathering network without the use of expensive equipment - a liquid (methanol) flow meter;

- ensuring the function of dosed supply of the inhibitor into the pipelines of the gas gathering network;

- providing the possibility of remote control from the control room according to a given algorithm by supplying an electrical signal to the solenoid valve;

- the presence of the function of the dosed supply of the inhibitor into the pipelines of the gas gathering network in manual mode using the throttle package;

- the possibility of using the manual control line in parallel with the remote control line, setting a constant flow rate through the throttle package;

- the ability to perform the function of dosed inhibitor feed at low temperatures - up to minus 60 ° С;

- simplicity, reliability, relatively low cost.

The illustrations indicate:

- pos. 1, 2, 3, 4, 5, 6 - ball valves;

- pos. 7, 8 - sensors allowing to establish the presence of excess pressure;

- pos. 9 - manometer;

- pos. 10 - solenoid two-way valve KSM-1;

- pos. 11 - filter;

- pos. 12 - throttle package;

- pos. 13 - check valve;

- pos. 14 - heater;

- pos. 15 - oven;

- pos. 16 - terminal box;

- pos. 17 - support.

- item 18 - perforated filter cup;

- pos. 19 - mesh;

- item 20 - filter housing;

- pos. 21 - plug;

- pos. 22 - tube;

- pos. 23 - rubber ring;

- pos. 24 and pos. 25 - valve body;

- pos. 26 - spring;

- pos. 27 - shutter;

- pos. 28 - valve sealing ring;

- pos. 29 - rubber valve ring;

- pos. 30 - valve protective ring;

- pos. 31 - ball valve body;

- pos. 32 - fittings;

- pos. 33 - rings;

- pos. 34 - ball;

- pos. 35 - sealing ring of the ball valve;

- pos. 36 - rubber ring of the ball valve;

- pos. 37 - handle;

- pos. 38 - rod sealing ring;

- pos. 39 - methanol inlet;

- pos. 40 - methanol yield.

FIG. 1 shows a general view of the block.

FIG. 2 shows a basic hydraulic diagram.

FIG. 3 shows the construction of the filter.

Figure 4 shows the structure of the check valve.

Figure 5 shows the construction of a ball valve.

The device works as follows.

A ball valve pos. 1, filter pos. 11 and gauge pressure sensor pos. 7 (showing the pressure in the methanol line), then the ball valve pos. 2, solenoid two-way valve KSM-1 pos. 10, ball valve pos. 3, gauge pressure gauge pos. 8 (showing the pressure at the methanol injection point), check valve pos. 13, manometer pos. 9, ball valve pos. 4. To create a reserve for the solenoid two-way valve KSM-1 pos. 10, the block design provides a bypass line with ball valves installed on it, pos. 5, pos. 6 and a manual regulating device - a throttle package pos. 12. The supply of methanol along the bypass line is carried out with the ball valves closed pos. 2, pos. 3.

For ease of maintenance, a plate with a hydraulic schematic diagram is installed on the block cover. The unit inlet line (Inlet) and methanol supply line (Outlet) are marked on the plates attached to the unit casing.

The calculation of the inhibitor flow rate, according to the operating manual for the two-way solenoid valve, is carried out indirectly, according to the number and duration of the actuation of the two-way solenoid valve KSM-1 pos. 10 depending on the pressure drop across the valve, which is determined by the overpressure sensors pos. 7 and pos. 8. The algorithm of the solenoid valve actuation is entered into the control unit (controller), which is located in the operator room at the upper level.

The equipment is placed in a heating cabinet, pos. 15, which is installed on a support, pos. 17, at the operation site.

The equipment is designed for operation at an ambient temperature of minus 60 ° C with a working heating system, i.e. when the ambient temperature drops below minus 35 ° C, the oven must be tightly closed, the heating of the oven (heater item 14) must be turned on.

Power supply for pressure sensors pos. 7 and pos. 8, solenoid valve KSM-1 pos. 10, heater pos. 14 through the explosion-proof terminal box pos. 16. All energized elements of the unit are grounded internally and externally.

The order of putting the unit into operation.

The handles of all valves in the block must be moved to the "closed" position.

Supply methanol to the block entrance.

Open the valves pos. 1 - pos. 4 (Figure 1, Figure 2). Apply voltage to the solenoid two-way valve KSM-1 pos. 10. Fill the block with methanol.

Provide the required methanol consumption by supplying a control signal to the solenoid two-way valve KSM-1 pos. 10, in accordance with the manual.

According to the indication of the manometer pos. 9 and (or) pressure sensor pos. 8 make sure that the solenoid valve KSM-1 pos. ten.

To create a reserve for the solenoid valve KSM-1 pos. 10, the design provides for a bypass line with a throttle package installed on it, pos. 13.

Remove voltage from the solenoid two-way valve KSM-1 pos. 10. Open the valves, pos. 5, 6. Fill the bypass line with methanol and close the valves pos. 2, pos. 3.

Adjust the throttle package pos. 12 for a given flow rate. Close the valves pos. 5, 6.

Apply voltage to the solenoid two-way valve KSM-1 pos. 10. Close the cabinet.

The manual control line can be used in parallel with the remote control line by setting pos. 12 constant flow, with all valves to be set to the "open" position.

Solenoid two-way valve KSM-1 pos. 10 provides, with time-pulse control, by adjusting the pulse duration (open-closed), the set flow rate taking into account the current pressure drop across it.

In case of remote control of the flow rate, the control signal to the valve is supplied from the control unit located in the control room, according to the specified control algorithm.

The solenoid two-way valve KSM-1 pos. 10 is supplied with a throttling valve with a calibrated hole. The diameter of the calibrated throttle hole is determined at the request of the customer's questionnaire and is indicated in the passport.

The design of the solenoid two-way valve KSM-1 and its operation is described in the operating manual, has a patent for useful model No. 193757. But it is permissible to use any other two-way solenoid valve known from the prior art, suitable for its characteristics.

The throttle package pos. 12 is intended for manual regulation of the methanol consumption both as an independent product and as a part of inhibitor dosing units. The choke package is supplied with chokes with calibrated holes. The diameter of the calibrated choke holes is determined at the request of the customer's questionnaire and is indicated in the passport.

The design of the throttle package and its operation is described in the operation manual, has a patent for a useful model No. 192786. But it is permissible to use any throttle package known from the prior art, which is suitable for its characteristics.

In order to purify technical methanol passing through all the elements of the block from solid impurities, a fine filter pos. eleven

Filter design pos. 11 is shown in Figure 3.

The fine filter is a perforated glass pos. 18 with a mesh reinforced inside it pos. 19. A glass with a grid is placed in the body pos. 20 with inlet and outlet fittings. Glass pos. 18 is pressed against the bottom of the body pos. 20 plug pos. 21, into which the needle plug pos. 22, designed to release accumulated dirt and relieve pressure during dismantling. On the plug pos. 22 is put on the tube, impurities and methanol are collected in the container. Methanol is fed into the perforated glass pos. 18 on the grid pos. 19, where it is cleaned. Tightness in relation to the external environment is provided by a rubber ring pos. 23

In order to prevent the backflow of methanol through the elements of the block (when the pressure in the gas pipeline where the methanol is supplied exceeds the pressure at the outlet of the block), a check valve pos. 13

Check valve design pos. 13 is shown in Figure 4.

The valve consists of bodies pos. 24 and pos. 25.

In the housing pos. 25 is placed compressed by the spring pos. 26 shutter pos. 27.

The tightness of the valve against reverse flow is ensured by the plug pos 27 and a sealing ring pos. 28.

Tightness in relation to the external environment is provided by a rubber ring pos. 29 and a protective ring pos. thirty.

The design of the ball valve (pos. 1-pos. 6) is shown in Figure 5.

The crane consists of a body pos. 31 with inlet and outlet fittings pos. 32, which are sealed with rings pos. 33.

The shut-off valve is the ball pos. 34, sealed with rings 35 and rubber rings pos. 36. Rotation of the ball pos. 34 is carried out using the handle pos. 37. The stem is sealed with a ring pos. 38.

The inhibitor dosing unit design provides:

- the presence of the function of the dosed supply of the inhibitor into the pipelines of the gas gathering network without the use of expensive equipment - a liquid (methanol) flow meter;

- the presence of the function of the dosed supply of the inhibitor into the pipelines of the gas gathering network

remotely from the operator room according to a given algorithm by applying an electrical signal to the solenoid valve pos. ten;

- the presence of the function of the dosed supply of the inhibitor into the pipelines of the gas gathering network in manual mode using the throttle package pos. 12;

- the possibility of using the manual control line in parallel with the remote control line, setting through the throttle package pos. 12 constant flow;

- the ability to perform the function of dosed inhibitor feed at low temperatures - up to minus 60 ° С;

- simplicity, reliability, relatively low cost.

Claims (4)

1. Block for dosing inhibitor, including pipeline, valves, characterized in that the block contains a main line and a bypass line, the main line includes a pipeline and installed in series along its course, the first ball valve, filter, second ball valve, two-way solenoid valve, third ball valve , check valve, pressure gauge, fourth ball valve, bypass line includes a pipeline and a fifth ball valve, throttle package, sixth ball valve installed in series along its course, and the bypass line begins with the first branch from the main line between the filter and the second ball valve, ends with the second branch between the third ball valve and the check valve, and in the area of the first and second branches, pressure sensors are installed with the ability to determine the pressure in the main pipeline. 2. An inhibitor dosage unit according to claim 1, wherein the inhibitor is methanol. 3. The inhibitor dosing unit according to claim 1, characterized in that the bypass line is configured to supply methanol through it only when the second and third ball valves are closed. 4. The inhibitor dosing unit according to claim 1, characterized in that it is installed in a heating cabinet.

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