RU2229070C1 - Method and device for inert nitrogen-based gas mixture obtaining - Google Patents

Abstract

FIELD: compressor-building engineering, particularly provision of explosion-proof operation during gas, gas-condensate and oil well repair and development. SUBSTANCE: method involves compressing atmospheric air free from mechanical admixtures into initial compressor stages up to pressure of 8 - 12 kg/sq.sm; cooling compressed air; removing water and oil drops from compressed air into cooler and water-and-oil trap; cleaning air from water and oil vapor into air fine filter; separating air in gas-separator into inert nitrogenbased gas mixture with oxygen content of 10% and oxygen enriched air; extracting oxygen from air into gas-separator and compressing oxygen up to pressure of 100 - 150 kg/sq.cm; removing admixtures from oxygen into water-and-oil trap; cooling oxygen up to temperature below 40 C into cooler; feeding inert gas mixture through multi-stage booster unit into vessel, wherein inert gas mixture feeding into vessel is performed by all booster unit cylinders during the initial period to increase vessel pressure up to the first step pressure; feeding inert gas mixture from the first step into the second compression step along with pumping gas mixture simultaneously by the second step and the third step cylinders to obtain vessel pressure equal to that of the second step; operating booster unit by successive cycle, namely the first-the second-the third steps pumping into vessel along with inert gas mixture cooling up to temperature 40 C into coolers and cleaning into water-and-oil traps or heating into heater (or vortex tube) up to temperature of 150 - 300 C and supplying to consumers under pressure of 25 - 250 kg/sq.sm. EFFECT: increased extraction factor of inert gas mixture, decreased oxygen content into inert gas mixture, increased use factor of compressed air components, extended range of obtained air components by temperature, pressure and efficiency. 7 cl, 1 dwg

Description

The invention relates to the field of compressor engineering and can be used for explosion-proof work on the repair and development of gas, gas condensate and oil wells, for cleaning the bottom of wells from the accumulation of oil products, liquid and sand, for storing products, in fire fighting, emergency response and gas welding as:

- a mobile nitrogen compressor station for the supply of nitrogen with a pressure of 200-250 kgf / cm ² and a flow rate of 12-15 nm ³ / min to perform well development operations after drilling and overhaul of wells, purging and crimping pipelines, tanks operated with explosive hydrocarbon environments;

- installations for the supply of nitrogen with a pressure of up to 250 kgf / cm ² and a flow rate of 10-12 nm ³ / min and a gas temperature of 200-300 ° C in the annulus of the wells to perform operations for dewaxing the bottom-hole zone of the wells;

- a mobile nitrogen compressor station for supplying hot nitrogen at a pressure of 8-12 kgf / cm ² with a flow rate of 10-12 nm ³ / min for heating with hot gas (200-300 ° C) icing shut-off valves, dewaxing pipelines, tanks instead of a mobile steam-heating installation ;

- a mobile nitrogen compressor station for the supply of nitrogen at a pressure of 8-12 kgf / cm ² with a flow rate of 10-12 nm ³ / min to perform technological operations in the repair and testing of pipelines, apparatuses, tanks operating with explosive hydrocarbon media;

- a mobile compressor station for air supply with a pressure of 200-250 kgf / cm ² and a flow rate of 10-12 nm ³ / min as a mobile high-pressure air compressor station for crimping, purging pipelines, tanks, etc .;

- a mobile compressor station with air supply of general industrial pressure (P = 8-10 kgf / cm ² and flow rate Q = 18-22 nm ³ / min) for actuating various pneumatic tools (hammers, perforators, etc.), blowing, pressure testing of pipelines;

- a mobile compressor station for air supply with a distribution pressure of 25-35 and 80-90 kgf / cm ² and a capacity of Q = 8-12 nm ³ / min.

The closest in technical essence to the claimed invention is a method for producing an inert gas mixture based on nitrogen by compressing atmospheric air purified from mechanical impurities in the initial stages of the compressor to a pressure of 8-12 kgf / cm ² , cooling it, and removing droplet moisture and oil in the refrigerator and a water-oil separator, purification of water and oil vapors in an air fine filter, separation of air in a gas separation unit into an explosion-proof inert gas mixture based on nitrogen with acid content kind of 10% as supplied in multistage booster apparatus for further compressing, and oxygen enriched air.

To implement this method, there is a device containing a sequentially located inlet of atmospheric air, an air filter, a multi-stage compressor, a refrigerator, an oil separator, a fine filter, a gas separation unit, a multi-stage booster device, between the steps of which refrigerators and oil separators are located, and an inert nitrogen gas mixture outlet as well as the output of compressed oxygen connected to the gas distribution unit through an oxygen compressor and cold nik [1]. The disadvantages of the known method and device are: inefficient use of a multi-stage compressor (less than 60%), downtime in the operation of gas compressor nitrogen stations, associated with monofunctionality - obtaining only an inert gas mixture based on nitrogen with the same parameters in pressure, capacity and temperature;

The aim of the invention is to remedy these disadvantages.

Effect: increasing the utilization rate of compressed air components (nitrogen and oxygen) to 95%, expanding the range of produced air components (nitrogen and oxygen) by pressure (8-250 kg / cm ² ), temperature (20-300 ° C), productivity (12-25 m ³ / min).

The problem is solved in that, in contrast to the known method of producing an inert gas mixture based on nitrogen by compressing atmospheric air purified from mechanical impurities in the initial stages of the compressor to a pressure of 8-12 kgf / cm ² , cooling it, and removing moisture and oil from refrigerator and water-oil separator, purification of water and oil vapors in a fine filter, separation of air in a gas separation unit into an explosion-proof inert gas mixture based on nitrogen with an oxygen content of 10%, compressing a multi-stage booster device for further compression, and oxygen-enriched air according to the invention, oxygen is released from the air in the gas separation unit, which is then compressed to 100-150 kg / cm ² , cleaned of impurities in the oil-water separator and cooled to a temperature below 40 ° C in the refrigerator, and an inert gas mixture based on nitrogen with an oxygen content of 10% is fed through a multi-stage booster device to the tank, and in the initial period, the inert gas mixture is pumped into the tank the booster device indices until the pressure in the vessel reaches the pressure of the first stage, after which the inert gas mixture from the first stage is fed to the second compression stage, and the injection is carried out simultaneously by the cylinders of the second and third stages to a pressure in the vessel equal to the pressure of the second stage, and only after that the booster device is operated in a sequential cycle: the first - second - third stages - injection into the container, and after each stage the inert gas mixture is cooled to a temperature of 40 ° C in refrigerators and cleaned of moisture and oil in water-oil separators or heated in a gas heater (or in a vortex tube) to a temperature of 150-300 ° C and served in the consumer with a pressure of 25-250 kgf / cm ² .

To implement this method, a device containing a sequentially located inlet of atmospheric air, an air filter, a multi-stage compressor, a refrigerator, an oil separator, a fine filter, a gas separation unit, a multi-stage booster device, between the steps of which there are refrigerators and oil separators, and an inert nitrogen gas mixture, as well as a compressed oxygen outlet connected to the gas distribution unit through an oxygen compressor and a refrigerator in the proposed invention, an additional input device is provided with an additional outside air filter, an additional output of the compressed inert nitrogen gas mixture, compressed to a combined yield of 25-250 kg / cm ² inert gas mixture or air, compressed to yield 8-12 kgf / cm ² atmospheric air, an additional gas separation unit, connected by an input to the gas distribution unit, and an outlet to an oxygen compressor, an additional water-oil separator installed after the oxygen compressor, a gas heater, connected to the compressor outlet, and an outlet to the air outlet, a gas heater, connected to the inlet of the booster device, and an output to the inert gas mixture outlet, and a gas heater, connected to the inlet gas distribution unit, and the output to the second inert gas outlet mixture, three electromagnetic cranes, providing a serial or parallel connection of the stages of the booster device, a bypass line of a gas distribution device containing three cranes, a bypass line for a screw compressor containing five taps, with each outlet equipped with direct and non-return safety valves.

The option involves the use of a short-cycle adsorption or membrane gas separation unit; multi-stage rotary screw compressor, hydro-pneumatic booster device, gas separation unit in the form of a gas diffusion type oxygen delay unit, a gas heater in the form of a vortex tube, an oxygen compressor in the form of a hydro-pneumatic booster device.

The option provides that the multi-stage compressor is made piston in the form of a W-shaped six-row six-cylinder five-stage piston compressor, and the booster is made in the form of two or three last stages of the multi-stage compressor.

The proposed method for producing an inert gas mixture based on nitrogen and the device eliminate the disadvantages of the known method, increase the efficiency of the use of air components (nitrogen and oxygen) to 95%, expand the range of produced air components (nitrogen and oxygen) by pressure, temperature. productivity, which increases the efficiency of their use.

An analysis of the information showed that the claimed technical solution is unknown from the achieved level of technology, and therefore it meets the criterion of "novelty."

Such a technical solution does not explicitly follow from the prior art and, therefore, meets the criterion of “inventive step”.

The claimed invention creates a positive effect, which is expressed in the fact that the air, previously cleaned of mechanical impurities, after preliminary compression is cooled and purified in refrigerators and water-oil separators and a fine filter. Cooled air, purified from impurities and water and oil vapors, enters the gas separation unit, which facilitates operating conditions for it and subsequent stages of a three-stage booster device, increases the concentration of nitrogen in an inert gas medium, oxygen utilization, and an expanded range of oxygen, pressure and temperature, an inert gas mixture based on nitrogen and atmospheric air increases the efficiency of their use.

The foregoing indicates that the invention meets the criterion of "industrial applicability".

The invention is illustrated by the drawing, which schematically shows a device for producing an inert gas mixture based on nitrogen, which basically do not differ from other embodiments of the proposed invention.

The device has two inlets of atmospheric air, three outlets of a compressed inert nitrogen gas mixture, one outlet for compressed oxygen and one outlet for compressed air, each outlet has direct and reverse safety valves (not shown); two air filters 1, a two-stage rotary screw compressor 2, five refrigerators 4 and five water-oil separators 5, 3 vortex tubes 3, a fine filter 6, a gas separation device GRU of 2 gas separation blocks 7, 8, an oxygen compressor 9, a three-stage hydropneumatic remote control booster device, after the screw compressor and each stage of the booster device, safety valves PC 1-4 are installed; three electromagnetic cranes EK1-EK3, a bypass line of a gas distribution device, consisting of process pipelines and K3, K8, K9 valves, a bypass line (or shutdown) of a screw compressor, consisting of technological pipelines and valves K1, K2, K3, K8, K9.

The device operates as follows.

Atmospheric air is pre-cleaned of mechanical impurities in the air filter 1 and enters a two-stage rotary screw compressor 2, is compressed in it to a pressure of 8-12 kgf / cm ² , is cooled to a temperature below 40 ° C and is cleaned of drip moisture and oil in the refrigerator 4 and oil and water separator 5.

With the open valve K1 and the closed valve K2 heated by friction in a rotary screw compressor 2 to 100 ° C, air with a pressure of 8-12 kgf / cm ² enters the vortex tube 3, where it is additionally heated to a temperature of 150-300 ° C and supplied to the consumer (not shown).

Cooled and purified air with a pressure of 8-12 kgf / cm ² enters the fine filter 6, where it is cleaned of water and oil vapors, and is fed to the gas separation unit 7, in which air is separated into an inert nitrogen gas mixture (oxygen concentration up to 10)) and oxygen-enriched air, which is supplied to the second gas separation unit 8, where the oxygen concentration increases to 90-99%.

The oxygen mixture is supplied to the oxygen compressor 9, compressed in it to a pressure of 100-150 kgf / cm ² , cooled to a temperature of 40 ° C and cleaned of droplet moisture and oil in the refrigerator 4 and water-oil separator 5 and pumped into oxygen cylinders (not shown).

An inert nitrogen gas mixture with closed valves K4, K6, K8, K9 and an open valve K7 with a pressure of 8-12 kgf / cm ² enters the first and subsequent stages of the booster device ДУ 10, 11, 12, in the initial period gas injection into the tank ( not shown) is carried out by all cylinders of the booster DE device until the pressure in the tank reaches the pressure of the 1st stage 10, after which the gas from the 1st stage is supplied to the 2nd stage of compression 11, and the injection is carried out simultaneously by cylinders II- 1st and 3rd stages 11, 12 to a pressure in the tank equal to the pressure II- of the 11th stage, and only after that the operation of the remote control proceeds in a sequential cycle: I — II — II — III stages — injection into the container; after each stage, the inert nitrogen gas mixture is cooled to a temperature of 40 ° C and is cleaned of moisture and oil sequentially in refrigerators 4 and oil and water separators 5 after the first and subsequent stages of the booster device and fed to the consumer with a pressure of 200-250 kgf / cm ² (not shown ) When closing the valve 16 and opening the valve 17, an inert nitrogen gas mixture at a pressure of 200-250 kgf / cm ² enters the vortex tube, where it is heated to a temperature of 150-300 ° C and supplied to the consumer (not shown).

Using electromagnetic cranes EK1-EK3, an inert nitrogen gas mixture with a pressure of 8-12 kgf / cm ^{2 in} series (main mode) or in parallel connects the first and subsequent stages of the booster device 10, 11, 12.

With closed cranes K4, K6, K8, K9, K11, K13, K14, K15, K17 and open cranes K7, K10, K12, K16 and the same overlap of electromagnetic valves EK1-EK3, the inert nitrogen gas mixture flows at a pressure of 8-12 kgf / cm ² in all three stages of the booster device 10, 11, 12, is compressed, cleaned of moisture and oil sequentially in refrigerators 4 and oil and water separators 5 after the first and subsequent stages of the booster device and is supplied to the consumer with a pressure of 25-35 kgf / cm ² ( not shown).

With closed cranes K4, K6, K8, K9, K10, K13, K14, K15, K17 and open cranes K7, K11, K12, K16 and parallel connection with electromagnetic cranes EK2-EK3 of the second and subsequent stages of the booster device 11, 12 is inert the nitrogen gas mixture after the first stage of the booster device 10 enters at a pressure of 30-40 kgf / cm ² into the second and third stages of the booster device 11, 12, it is compressed, cleaned of moisture and oil sequentially in refrigerators 4 and oil and water separators 5 after the first and third stages of the booster device and fed into the object beating with a pressure of 80-90 kgf / cm ² (not shown).

An inert nitrogen gas mixture with a pressure of 8-12 kgf / cm ² and a flow rate of up to 10 nm ³ / min with closed taps K4, K7 and open taps K5, K6 enters the vortex tube, where it is cooled to a temperature of 10-30 ° C and supplied to the consumer (not shown). With closed valves K5, K7 and open valves K4, K6, the inert nitrogen gas mixture is heated in a vortex tube to a temperature of 100-300 ° C and supplied to the consumer (not shown).

When bypassing the gas separation device of the GRU (valves K3, K9 are closed), the cooled and purified air with a pressure of 8-12 kgf / cm ² enters the booster ДУ, is compressed in its first and subsequent stages 10, 11, 12, it is cleaned of moisture and oil sequentially in refrigerators 4 and oil and water separators 5 after the first and subsequent stages of the booster device and is supplied to the consumer (not shown) with pressures 25-35; 80-90; 200-250 kgf / cm ² and a temperature of 40-300 ° C, depending on the method of connecting the steps of the booster device.

When bypassing (or shutting down) the rotary screw compressor 2, closing the K8 valve and opening the K9 valve, the air cleaned in the air filter 1 enters the remote control booster device, is compressed in its first and subsequent stages 10, 11, 12, it is cleaned of moisture and oil sequentially in refrigerators 4 and oil and water separators 5 after the first and subsequent stages of the booster device and is supplied to the consumer (not shown) with pressures of 15-25; 70-80; 190-240 kgf / cm ² and a temperature of 40-300 ° C, depending on the method of connecting the steps of the booster device.

Compared with the prototype, the described method of producing an inert gas atmosphere based on nitrogen and a device for its implementation are guaranteed to provide explosion-proof and compressed air and oxygen for the repair and development of gas, gas condensate and oil wells, cleaning the bottom of the wells from accumulation of oil products, liquid and sand, in fire fighting and gas welding operations.

FSUE Uraltranssmash has developed technical documentation for a mobile nitrogen compressor station, in which the claimed solution is implemented.

Sourse of information

1. Patent RU No. 2209382, cl. F 25 J 3/00, 2003

Claims (7)

1. A process for preparing the inert gas mixture based on nitrogen by compressing purified from mechanical admixtures of air in the initial stages of the compressor to a pressure of 8-12 kgf / cm ^2, cooling, removal of condensed moisture and oil in the refrigerator and water ohm aslootdelitele, purification from water and oil vapors in the fine filter, separation of air in the gas separation unit into an explosion-proof inert gas mixture based on nitrogen with an oxygen content of 10%, which enters the multi-stage booster for long-range compressing it, and oxygen-enriched air, characterized in that the air gas separation unit to produce oxygen which is further compressed to 100-150 kgf / cm ^2, was purified from the contaminants in waters ohm aslootdelitele and cooled to a temperature below 40 ° C in a refrigerator and an inert gas mixture based on nitrogen with an oxygen content of 10% is fed through a multi-stage booster device to the tank, and in the initial period, the inert gas mixture is pumped into the tank by all cylinders of the booster device until the pressure capacity reaches the first stage pressure, after which is inert th gas th mixture from the first stage is fed to the second compression stage, and injecting is performed at the same time the cylinders of the second and third stages to a pressure in the vessel equal to the pressure of the second stage, and only after that operation of the booster device are on the serial cycle: first - second - third stage - injecting into the vessel, and after each step the inert gas mixture is cooled to a temperature of 40 ° C in refrigerators and purified from moisture and oil in a water ohm ASLO separators or heated in a gas heater (or in a vortex tube) to a temperature of 150-300 ° C and served in the consumer with a pressure of 25-250 kgf / cm ² . 2. The apparatus for producing an inert gas mixture based on nitrogen, comprising in sequence the air inlet, air filter, multistage compressor, refrigerator, water ohm aslootdelitel, air fine filter, gas separation unit, a multi-stage booster device, which is arranged between the stages refrigerators and water aslootdeliteli ohm and output an inert nitrogen gas mixture as well as compressed oxygen outlet connected to the gas distribution block via an oxygen kompres Op and a refrigerator, characterized in that the device is provided with an additional input of air with an optional air filter, an additional output of the compressed inert nitrogen gas mixture, compressed to a combined yield of 25-250 kgf / cm ² inert gas mixture or air, compressed to yield 8- 12 kgf / cm ^{2 of} atmospheric air, with an additional gas separation unit, connected by an inlet to a gas distribution unit, and by an outlet to an oxygen compressor, by an additional water-oil separator installed after e of an oxygen compressor, a gas heater connected to the compressor inlet, and an outlet to an air outlet, a gas heater connected to an inlet of a booster device, and an output to an inert gas mixture outlet, and a gas heater connected to an gas distribution unit, and the output to the second exit of the inert gas mixture, three electromagnetic valves, providing a series or parallel connection of the stages of the booster device, the bypass line of the gas distribution device, soda holding three cranes, a bypass line of a screw compressor containing five cranes, each output equipped with direct and non-return safety valves. 3. The device according to claim 2, characterized in that the gas separation unit is made of adsorption short-cycle. 4. The device according to claim 2, characterized in that the gas separation unit is made of a membrane. 5. The device according to claim 2, characterized in that the multistage compressor is rotary-screw, the booster is hydropneumatic, the gas separation unit is a gas diffusion type oxygen block, the gas heater is made in the form of a vortex tube, the oxygen compressor is made in the form of a hydropneumatic booster devices. 6. The device according to claim 2, characterized in that the multistage compressor is made piston. 7. The device according to claim 2, characterized in that the multi-stage compressor is made in the form of a W-shaped six-row six-cylinder five-stage reciprocating compressor, and the booster device is made in the form of two or three last stages of the multi-stage compressor.