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Multi-stage gas compression system for supercritical carbon dioxide and operating method

A gas compression system and carbon dioxide technology, applied in the field of gas compression, can solve the problems of broken pipes, blocked pipes with dry ice, and the bypass regulating valve cannot be opened, so as to avoid the effect of strong impact.

Active Publication Date: 2019-08-02
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When the existing gas compression system is applied to supercritical carbon dioxide compression, there are the following problems: the final compressed gas is in a high-pressure state, and if the gas is depressurized through the bypass regulating valve, the gas temperature will drop sharply due to the large decompression range. The phase change of carbon dioxide is caused, and dry ice is generated to block the pipeline, so the bypass regulating valve cannot be opened during normal operation, so the unit cannot adjust the exhaust volume during normal operation; When the pressure valve releases pressure, the gas temperature will drop sharply and cause carbon dioxide phase change, causing dry ice to block the pipeline. Therefore, it is impossible to unload before the normal shutdown. Instead, the main motor is directly stopped when the compressor is running at full load, but this is a direct shutdown. The method will have a great impact on the stressed parts of the main engine of the reciprocating compressor, causing the piston rod to easily break; If the venting is too fast, there will also be a problem of too fast decompression, which will also cause a phase change of carbon dioxide, and dry ice will form after reaching the triple point temperature, blocking the flow of gas in the pipeline, eventually causing the pipe to break, and the release of high-density carbon dioxide is harmful to the environment. There are potential safety hazards for the human body

Method used

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  • Multi-stage gas compression system for supercritical carbon dioxide and operating method
  • Multi-stage gas compression system for supercritical carbon dioxide and operating method
  • Multi-stage gas compression system for supercritical carbon dioxide and operating method

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Embodiment 1

[0037] like figure 1 and figure 2 As shown, the present embodiment provides a multi-stage gas compression system for supercritical carbon dioxide, including a base 35 and a multi-stage reciprocating piston compressor installed on the base 35, and the present embodiment uses a multi-stage reciprocating piston compressor The number of stages is three stages (primary stage, secondary stage and final stage respectively according to the direction of the intake air flow). For example, the three-stage reciprocating piston compressor includes a main engine 1 and three-stage compression cylinders connected with the main engine 1 respectively. The main engine 1 passes through The diaphragm coupling 2 is connected with the motor 3, and the motor 3 transmits the rotational motion to the main engine 1 through the diaphragm coupling 2, and the main engine 1 converts the rotational motion of the crankshaft into the reciprocating motion of the piston. Compress the carbon dioxide, so that th...

Embodiment 2

[0047] like figure 1 and image 3 As shown, this embodiment is further optimized on the basis of embodiment 1, the main difference is:

[0048] Between the primary compression cylinder 15 and its air inlet, a primary air intake separator 13 and a primary intake buffer tank 14 are communicated in sequence along the air intake direction through a ventilation pipeline, and a primary exhaust air tank is connected between the primary compression cylinder 15 and its air outlet through a ventilation pipeline. The air buffer tank 16; the secondary compression cylinder 20 and its air inlet are connected with the secondary air intake separator 18 and the secondary air intake buffer tank 19 sequentially along the air intake direction through the air duct, and the secondary compression cylinder 20 and its air outlet The two-stage exhaust buffer tank 21 is connected through the ventilation pipe; the final-stage intake separator 23 and the final-stage intake buffer tank are connected in se...

Embodiment 3

[0052] like figure 1As shown, the present embodiment is further optimized on the basis of embodiment 1 and embodiment 2, specifically:

[0053] The air intake control system includes an intake valve 11 connected in series with the total intake port 9 and an intake purge valve 12 connected in parallel with the intake valve 11. The intake purge valve 12 is connected in parallel with the intake valve 11. The flow rate of the intake purge valve 12 is It is smaller than the intake valve 11. During the start-up phase, the air pressure in the system can be maintained at a lower pressure value and the air in the system can be replaced by controlling the intake purge valve 12. After the system is started and loaded, close the intake purge valve 12 and open the intake air. The valve 11 is for normal air supply, and the exhaust control system includes an exhaust check valve 28 and an exhaust valve 29 connected in series with the main exhaust port 10 along the exhaust direction. The open...

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Abstract

The invention discloses a multi-stage gas compression system for supercritical carbon dioxide and an operating method, and belongs to the technical field of gas compression. The multi-stage gas compression system comprises a multi-stage reciprocating piston-type compressor and a temperature control system, an air inlet of a primary compression cylinder communicates with a total air inlet, an air outlet of a tail-stage compression cylinder sequentially communicates with the temperature control system and a total exhaust opening, and the air outlet of the tail-stage compression cylinder furthercommunicates with an air outlet assembly; and the multi-stage gas compression system further comprises a bypass control system, an emptying control system and a graded pressure adjusting system capable of returning the air back to the air inlet of each stage compression cylinder from the air outlet of the tail-stage compression cylinder stage by stage so as to slowly reduce the exhaust pressure, and the air outlet assembly communicates with the bypass control system, the emptying control system and the graded pressure adjusting system. According to the multi-stage gas compression system, the bypass control system, the emptying control system and the graded pressure adjusting system are arranged, the exhaust pressure is safely and flexibly adjusted, safe unload and empty are achieved, and the phase change of the carbon dioxide due to the sharp change of the pressure and the temperature in the pressure reduction, unloading and emptying processes is avoided.

Description

technical field [0001] The invention relates to the field of gas compression, and more specifically relates to a supercritical carbon dioxide multistage gas compression system and an operating method thereof. Background technique [0002] Carbon dioxide gas flooding enhanced oil recovery technology is the use of CO 2 It has the characteristics of high solubility in both oil and water, and the CO 2 Inject into the oil layer to increase the volume of crude oil, reduce the viscosity of crude oil, and reduce the interfacial tension between oil and water, thereby effectively enhancing oil recovery and reducing CO 2 Permanent underground storage is a real energy-saving and emission-reducing and efficient production technology. This technology can not only meet the needs of oilfield development, but also solve the problem of carbon dioxide storage and protect the atmospheric environment. This technology is not only suitable for conventional oil reservoirs, but especially for low-...

Claims

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Application Information

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IPC IPC(8): F04B25/00F04B49/00F04B49/08F04B49/22F04B49/24F04B39/00
CPCF04B25/00F04B39/0027F04B49/00F04B49/08F04B49/22F04B49/24
Inventor 秦飞虎刘勇杨金叶永平邓晶何伟徐向阳
Owner BC P INC CHINA NAT PETROLEUM CORP
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