A marine explosion-proof liquid nitrogen pump skid

Abstract

The present invention discloses a marine explosion-proof liquid nitrogen pump skid, including a power system, a hydraulic system, a boosting device, an evaporator and an explosion-proof heating device. The power system includes a main motor and an auxiliary motor; the hydraulic system includes a main hydraulic pump, a main hydraulic motor, an auxiliary hydraulic pump, a first auxiliary hydraulic motor, a second auxiliary hydraulic motor and a vane pump; the boosting device includes a centrifugal boosting pump and a plunger pump, the centrifugal boosting pump is connected to the second auxiliary hydraulic motor, the plunger pump is connected to the main hydraulic motor, and the centrifugal boosting pump is connected to the plunger pump; the evaporator is connected to the plunger pump, the outlet of the evaporator is connected to the high-pressure nitrogen pipeline, and the vane pump, the evaporator, and the electric heater are connected in sequence through pipelines to form a circulating heating system. The motor drive of the present invention is explosion-proof, the equipment is small in size, light in weight, easy to hoist and move, can be accurately adjusted according to the final nitrogen exhaust temperature, safe and reliable, and can achieve full automatic control.

Description

Technical Field

[0001] The invention relates to the technical field of oil drilling and production, and in particular to a marine explosion-proof liquid nitrogen pump skid. Background Art

[0002] At present, the marine oil and gas reserves are abundant, and the land oil and gas resources are shrinking. The marine oil resources account for 34% of the total global oil resources, becoming the main source of the world's oil and gas production increase. Membrane nitrogen production equipment cannot meet the operational needs of deep-sea oil and gas production increase. High-purity, high-pressure, large-displacement liquid nitrogen pump equipment will be the main equipment for marine oil and gas production increase and development in the next few years.

[0003] The special working environment in offshore platforms and other fields has severely restricted the application of liquid nitrogen pump equipment. First, offshore platform oil and gas development is more likely to produce more flammable and explosive gases, so the explosion-proof capability of the equipment is extremely important. Secondly, it is necessary to meet the platform space requirements and carrying capacity requirements.

[0004] Existing liquid nitrogen pump equipment is driven by diesel engines, and the exhaust smoke has no cooling spark extinguishing device, and the electrical components and engines are not explosion-proof. They cannot be used on offshore platforms or other occasions with high explosion-proof requirements. Moreover, they are large in size and their weight exceeds the carrying capacity of offshore platforms, which limits the application of liquid nitrogen equipment in increasing oil and gas production on offshore platforms, and the oil and gas in the ocean cannot be fully developed. When diesel-driven liquid nitrogen pump equipment is in operation, it consumes a lot of fuel, has high operating costs, is noisy, and causes pollution. Summary of the invention

[0005] The purpose of the present invention is to address the defects of the prior art and provide a marine explosion-proof liquid nitrogen pump skid with reasonable structure, low cost, high degree of automation, easy maintenance, high working reliability, compact layout and smaller equipment size.

[0006] The technical solution of the present invention is: a marine explosion-proof liquid nitrogen pump skid, comprising

[0007] A power system, the power system comprising a main motor and an auxiliary motor mounted on a skid;

[0008] A hydraulic system, the hydraulic system comprising a main hydraulic pump, a main hydraulic motor, an auxiliary hydraulic pump, a first auxiliary hydraulic motor, a second auxiliary hydraulic motor and a vane pump, the power input end of the main hydraulic pump is connected to the power output end of the main motor, the power output end of the main hydraulic pump is connected to the power input end of the main hydraulic motor, the power input end of the auxiliary hydraulic pump is connected to the power output end of the auxiliary motor, the power output end of the auxiliary hydraulic pump is respectively connected to the power output end of the first auxiliary hydraulic motor and the power output end of the second auxiliary hydraulic motor, and the power output end of the first auxiliary hydraulic motor is connected to the power input end of the vane pump;

[0009] A boosting device, the boosting device comprises a centrifugal boosting pump and a plunger pump, the power input end of the centrifugal boosting pump is connected to the power output end of the second auxiliary hydraulic motor, the power input end of the plunger pump is connected to the power output end of the main hydraulic motor, and the outlet of the centrifugal boosting pump is connected to the inlet of the plunger pump through a pipeline;

[0010] An evaporator, wherein the liquid nitrogen inlet of the evaporator is connected to the outlet of the plunger pump through a pipeline, and the outlet of the evaporator is connected to a high-pressure nitrogen pipeline;

[0011] The explosion-proof heating device is an electric heater. The vane pump, evaporator and electric heater are connected in sequence through pipelines to form a circulating heating system. A heating medium inlet and a heating medium outlet are respectively provided on the pipelines of the circulating heating system.

[0012] A flow divider is provided on the pipeline between the outlet of the plunger pump and the liquid nitrogen inlet of the evaporator.

[0013] The outlet of the centrifugal booster pump is connected to a centrifugal booster pump overflow pipeline, and the outlet of the plunger pump is connected to a plunger pump overflow pipeline.

[0014] One outlet of the flow divider is connected to a safety pipeline, and the outlet ends of the safety pipeline, the overflow pipeline of the centrifugal booster pump and the overflow pipeline of the plunger pump are converged.

[0015] Another outlet of the flow divider is connected to a temperature regulating pipeline, and an outlet end of the temperature regulating pipeline is connected to a high-pressure nitrogen pipeline.

[0016] The plunger pump is a triplex plunger pump.

[0017] The power system, hydraulic system, booster, evaporator and explosion-proof heating device are all installed on the skid.

[0018] Compared with the prior art, the present invention has the following advantages: explosion-proof can be more easily achieved through motor drive, the equipment temperature adaptability is wider, the waste heat recovery system is omitted, the equipment size is small, the weight is light, it is easy to hoist and move, and it is more suitable for occasions such as offshore platforms where there are restrictions on the weight and size of the equipment. The various systems of the liquid nitrogen pump equipment can be driven separately through the hydraulic station, the explosion-proof electric heater control system and the whole machine control system are effectively compatible, the heating power of the explosion-proof electric heater can be accurately adjusted according to the final nitrogen exhaust temperature, it is safe and reliable, and can achieve full automatic control; the gasification heat can realize the conversion between electric heating and the heat source of the offshore platform, improve energy utilization, and reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the electric driving force flow chart of the present invention;

[0020] Figure 2is a flow chart of the electric heating system of the present invention;

[0021] Figure 3 It is the liquid nitrogen PID control diagram of the present invention;

[0022] In the figure: 1. main motor, 2. auxiliary motor, 3. main hydraulic pump, 4. main hydraulic motor, 5. auxiliary hydraulic pump, 6. first auxiliary hydraulic motor, 7. second auxiliary hydraulic motor, 8. vane pump, 9. centrifugal booster pump, 10. plunger pump, 11. evaporator, 12. high-pressure nitrogen pipeline, 13. electric heater, 14. heating medium inlet, 15. heating medium outlet, 16. diverter, 17. centrifugal booster pump overflow pipeline, 18. plunger pump overflow pipeline, 19. safety pipeline, 20. temperature control pipeline. DETAILED DESCRIPTION

[0023] The present invention is further described below with reference to the accompanying drawings and embodiments.

[0024] Reference Figure 3 , a marine explosion-proof liquid nitrogen pump skid, including a power system, a hydraulic system, a booster, an evaporator and an explosion-proof heating device. The power system, the hydraulic system, the booster, the evaporator and the explosion-proof heating device are all installed on the skid.

[0025] Reference Figure 1 The power system includes a main motor 1 and an auxiliary motor 2, the hydraulic system includes a main hydraulic pump 3, a main hydraulic motor 4, an auxiliary hydraulic pump 5, a first auxiliary hydraulic motor 6, a second auxiliary hydraulic motor 7 and a vane pump 8, the boosting device includes a centrifugal boosting pump 9 and a plunger pump 10, the plunger pump 10 is a three-cylinder plunger pump, and the outlet of the centrifugal boosting pump 9 is connected to the inlet of the plunger pump 9 through a pipeline.

[0026] The power output end of the auxiliary motor 2 is connected to the centrifugal booster pump 9 through the auxiliary hydraulic pump 5 and the second auxiliary hydraulic motor 7 to provide power for the centrifugal booster pump 9, and the centrifugal booster pump 9 performs primary boosting on the nitrogen.

[0027] At the same time, the power output end of the auxiliary motor 2 provides power to the vane pump 8 through the auxiliary hydraulic pump 5 via the first auxiliary hydraulic motor 6. The vane pump 8 can provide power for the heating medium of the evaporator 11 and provide power for the lubrication system.

[0028] The power output end of the main motor 1 provides power to the three-cylinder plunger pump 10 through the main hydraulic pump 3 and the main hydraulic motor 4, and performs secondary pressurization on the liquid nitrogen, and the maximum working pressure can reach 10000psi (69MPa); that is, the main motor 1 and the auxiliary motor 2 provide power to the hydraulic system, and drive the centrifugal booster pump, three-cylinder plunger pump, vane pump, lubrication system and other loads through the hydraulic system to provide power.

[0029] Reference Figure 2 and Figure 3 The liquid nitrogen inlet of the evaporator 11 is connected to the outlet of the plunger pump 10 through a pipeline, and the high-pressure nitrogen outlet of the evaporator 11 is connected to the high-pressure nitrogen pipeline 12; the evaporator 11 gasifies the high-pressure liquid nitrogen and outputs the high-pressure nitrogen.

[0030] Reference Figure 2 The explosion-proof heating device is an electric heater 13. The vane pump 8, the evaporator 11, and the electric heater 13 are connected in sequence through pipelines to form a circulating heating system. A heating medium inlet 14 and a heating medium outlet 15 are respectively provided on the circulating heating system pipeline. The electric heater 13 can heat the circulating medium in the evaporator 11 to provide the heat required for the gasification of liquid nitrogen.

[0031] A flow divider 16 is provided on the pipeline between the outlet of the plunger pump 10 and the liquid nitrogen inlet of the evaporator 11. One outlet of the flow divider 16 is connected to a safety pipeline 19, the outlet of the centrifugal booster pump 9 is connected to a centrifugal booster pump overflow pipeline 17, and the outlet of the plunger pump 10 is connected to a plunger pump overflow pipeline 18. The outlet ends of the safety pipeline 19, the centrifugal booster pump overflow pipeline 17, and the plunger pump overflow pipeline 18 are converged. The centrifugal booster pump overflow pipeline 17 and the plunger pump overflow pipeline 18 are partial liquid nitrogen overflows, and the safety pipeline 19 ensures safe and reliable operation.

[0032] A temperature regulating pipeline 20 is also connected to the other outlet of the flow divider 16, and the outlet end of the temperature regulating pipeline 20 is connected to the high-pressure nitrogen pipeline 12. The temperature of the nitrogen entering the high-pressure nitrogen pipeline 12 is adjusted by controlling the amount of liquid nitrogen flowing out of the flow divider 16 and the temperature regulating pipeline 20, and can be accurately adjusted according to the final nitrogen exhaust temperature, which is safe and reliable, and fully automated control is achieved.

[0033] The nitrogen first enters the centrifugal booster pump 9, which is driven by the auxiliary motor 2 to perform primary boosting on the nitrogen. The nitrogen after primary boosting enters the plunger pump 10, which is driven by the main motor 1 in sequence through the main hydraulic pump 3 and the main hydraulic motor 4 to perform secondary boosting on the nitrogen. The liquid nitrogen after secondary boosting enters the evaporator 11 through the diverter 16, and the circulating heating medium in the evaporator 11 is heated by the electric heater 13, so that the high-pressure liquid nitrogen entering the evaporator 11 is evaporated and gasified, and finally discharged from the high-pressure nitrogen pipeline 12. In order to adjust the temperature of the high-pressure nitrogen discharged from the high-pressure nitrogen pipeline 12, it can be controlled by controlling the flow rate of the liquid nitrogen flowing out of the plunger pump 10 through the diverter 16, which is safe and convenient to use.

[0034] The equipment of the present invention is small in size and light in weight, easy to hoist and move, and is more suitable for occasions such as offshore platforms where there are restrictions on the weight and size of the equipment; electric drive is easier to achieve explosion-proof than diesel drive, and the equipment temperature adaptability is wider; electric drive equipment has high energy utilization rate, does not produce polluting waste, complies with the country's environmental protection policies, and has greater development space; a high-power explosion-proof motor is used to drive the hydraulic station, and the hydraulic station drives each system of the liquid nitrogen pump equipment respectively; the heat of gasified liquid nitrogen comes from a high-power explosion-proof electric heater, and the explosion-proof electric heater control system is effectively compatible with the whole machine control system. The heating power of the explosion-proof electric heater can be accurately adjusted according to the final nitrogen exhaust temperature, which is safe and reliable, and fully automated control is realized; the gasification heat can realize the conversion between electric heating and the heat source of the offshore platform, improve energy utilization, and reduce energy consumption. Figure 3 ; The low-temperature and high-pressure plunger liquid nitrogen pump power end is adopted to realize the interchange of multi-stroke cold ends; the electrochemical corrosion principle is adopted to meet the marine anti-corrosion and moisture-proof working environment, and fully meet the application of offshore platform oil and gas development.

[0035] The present invention is not limited to the above-mentioned embodiments. Various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention. The changed contents still fall within the protection scope of the present invention.

Claims

1. A marine explosion-proof liquid nitrogen pump skid, characterized by: The invention comprises a power system, wherein the power system comprises a main motor and an auxiliary motor installed on a skid; a hydraulic system, wherein the hydraulic system comprises a main hydraulic pump, a main hydraulic motor, an auxiliary hydraulic pump, a first auxiliary hydraulic motor, a second auxiliary hydraulic motor and a vane pump, wherein the power input end of the main hydraulic pump is connected to the power output end of the main motor, the power output end of the main hydraulic pump is connected to the power input end of the main hydraulic motor, the power input end of the auxiliary hydraulic pump is connected to the power output end of the auxiliary motor, the power output end of the auxiliary hydraulic pump is respectively connected to the power output end of the first auxiliary hydraulic motor and the power output end of the second auxiliary hydraulic motor, and the power output end of the first auxiliary hydraulic motor is connected to the power input end of the vane pump; a boosting device, wherein the boosting device comprises a centrifugal boosting pump and a plunger pump, wherein the power input end of the centrifugal boosting pump is connected to the power output end of the second auxiliary hydraulic motor, the power input end of the plunger pump is connected to the power output end of the main hydraulic motor, and the The outlet of the centrifugal booster pump is connected to the inlet of the plunger pump through a pipeline; an evaporator, the liquid nitrogen inlet of the evaporator is connected to the outlet of the plunger pump through a pipeline, and the outlet of the evaporator is connected to a high-pressure nitrogen pipeline; an explosion-proof heating device, the explosion-proof heating device is an electric heater, the vane pump, the evaporator, and the electric heater are sequentially connected through pipelines to form a circulating heating system, and a heating medium inlet and a heating medium outlet are respectively provided on the pipeline of the circulating heating system; a splitter is provided on the pipeline between the outlet of the plunger pump and the liquid nitrogen inlet of the evaporator; the outlet of the centrifugal booster pump is connected to an overflow pipeline of the centrifugal booster pump, and the outlet of the plunger pump is connected to an overflow pipeline of the plunger pump; one outlet of the splitter is connected to a safety pipeline, and the outlet ends of the safety pipeline, the overflow pipeline of the centrifugal booster pump, and the overflow pipeline of the plunger pump are converged; the other outlet of the splitter is connected to a temperature regulating pipeline, and the outlet end of the temperature regulating pipeline is connected to the high-pressure nitrogen pipeline; the plunger pump is a three-cylinder plunger pump.

2. The marine explosion-proof liquid nitrogen pump skid according to claim 1, characterized in that: The power system, hydraulic system, booster, evaporator and explosion-proof heating device are all installed on the skid.

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