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A kind of supercritical CO2 multistage throttling device and method

A supercritical and critical pressure technology, applied in pipeline systems, gas/liquid distribution and storage, mechanical equipment, etc., can solve problems such as damage to pipelines and ancillary equipment, affecting the safe discharge of pipelines, hidden dangers, etc., to avoid low temperature damage , the effect of alleviating the fluid temperature drop and the degree of temperature drop

Active Publication Date: 2022-07-15
SINOPEC PETROLEUM ENG DESIGN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the supercritical CO 2 Pipelines and long-distance gas pipelines belong to high-pressure pipelines, and CO 2 Different from the physical and phase properties of natural gas, it has a strong throttling effect, so CO 2 Throttling has particularity and certain safety hazards
[0004] The inventors found that when the pipeline is throttling, the high-pressure CO in the pipeline 2 A strong throttling effect will be formed at the throttling orifice, if figure 1 Direct venting in the middle will cause a sudden change in the temperature field in the tube. When it drops to a certain pressure and temperature, the CO 2 Phase change occurs to form dry ice, which may block the pipeline and seriously affect the normal transportation of the pipeline. In addition, the strong low temperature will also cause damage to the pipeline and ancillary equipment, affecting the safe discharge of the pipeline

Method used

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  • A kind of supercritical CO2 multistage throttling device and method
  • A kind of supercritical CO2 multistage throttling device and method
  • A kind of supercritical CO2 multistage throttling device and method

Examples

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Effect test

Embodiment 1

[0037] In a typical embodiment of the present disclosure, such as Figure 2-Figure 6 shown, a supercritical CO 2 Multi-stage throttling device.

[0038] It mainly includes a throttle valve and a heating mechanism arranged on the venting pipe, wherein at least one throttle valve and one heating mechanism are respectively arranged, and the throttle valve and the heating mechanism are alternately arranged on the venting pipe, and the venting pipe is connected to conveying The pipeline and throttle valve adjust the flow rate conveyed by the venting pipe, and the heating mechanism heats the medium in the venting pipe.

[0039] for figure 1 In the existing technology, the process of directly venting the conveying pipeline directly, in the CO 2 The pipeline is depressurized to atmospheric pressure through the vent line. First at the vent valve, CO 2 The pressure inside the pipe is reduced to atmospheric pressure, so the CO released 2 The temperature is the same as its boiling p...

Embodiment 2

[0045] In another exemplary embodiment of the present disclosure, as Figure 2-6 shown, given a supercritical CO 2 Multi-stage throttling method.

[0046] Determining throttling and venting of supercritical CO 2 The process does not produce the minimum endothermic heat of dry ice, the calculation will convert the high pressure CO 2 temperature when throttled above critical pressure;

[0047] The temperature calculation model of pipeline throttling and orifice throttling is established, and it is judged that if the temperature after throttling is lower than the triple point temperature, the supercritical CO 2 The classification will be above the critical pressure, and the temperature will be maintained above the triple point temperature;

[0048] Determine the heating power required for throttling at all levels, configure parameters according to the critical pressure ratio, and convert the supercritical CO 2 Throttled to atmospheric pressure.

[0049] Among them, when it ...

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Abstract

The present disclosure provides a supercritical CO 2 The multi-stage throttling device and method relate to the technical field of pipeline safety control, comprising at least one throttling valve and at least one heating mechanism, the throttling valve and the heating mechanism are arranged alternately and spaced in sequence, and are connected in series and connected to conveying through the venting pipe in sequence. In the pipeline, by adjusting the opening of the throttle valve and the power of the heating mechanism, the gas discharged at the end of the vent pipe is higher than the triple point temperature, and the temperature during the discharge process is maintained by controlling the change of the fluid pressure in the gas transmission trunk line. Cooperate with multi-stage throttle valve to reduce the temperature difference before and after single-stage throttle valve, cooperate with heating structure, release the pressure in the vent pipe, effectively control the generation of dry ice, and achieve the purpose of safe release.

Description

technical field [0001] The present disclosure relates to supercritical CO 2 The technical field of pipeline safety control, in particular to a supercritical CO 2 Multistage throttling device and method. Background technique [0002] The statements in this section merely provide background related to the present disclosure and do not necessarily constitute prior art. [0003] supercritical CO 2 It has the characteristics of high density and low viscosity, and presents a state similar to gas and liquid. Most of the long-distance CO 2 The pipelines are transported in supercritical state. However, due to supercritical CO 2 Pipelines and long-distance gas pipelines belong to high-pressure pipelines, and CO 2 Different from the physical properties and phase characteristics of natural gas, it has a strong throttling effect, so CO 2 Throttling has particularity and certain security risks. [0004] The inventor found that when the pipeline is throttled, the high pressure CO2 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F17D3/01
CPCF17D3/01
Inventor 陈建磊梁海宁陈霖刘建武张艳范振宁高帅杜培恩李超冯亚妮李彤彤徐志诚李玉星胡其会张楠
Owner SINOPEC PETROLEUM ENG DESIGN
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