Separator liquid level measuring device and separator liquid level measuring method

Abstract

This invention provides a separator liquid level measuring device and a separator liquid level measuring method. The separator liquid level measuring device includes a pressurization component, a pipeline component, a differential pressure measuring device, and a thermal high-efficiency separator. The pipeline component includes a first pipeline and a second pipeline. The first pipeline is connected to the pressurization component, the positive pressure end of the differential pressure measuring device, and the interior of the thermal high-efficiency separator, respectively. The first pipeline is used to transport light materials. The second pipeline is connected to the negative pressure end of the differential pressure measuring device and the interior of the thermal high-efficiency separator, respectively, and is used to transport purge gas to the top cavity of the thermal high-efficiency separator. The differential pressure measuring device detects the liquid level height in the thermal high-efficiency separator by the pressure difference between the positive and negative pressure ends. The technical solution provided by this invention can solve the problems of bottom sedimentation caused by purge gas and poor liquid level measurement accuracy in the existing methods for measuring the liquid level of coal slurry inside the thermal high-efficiency separator.

Description

Technical Field

[0001] This invention relates to the field of coal slurry level measurement equipment, and more specifically, to a separator level measurement device and a separator level measurement method. Background Technology

[0002] Currently, in the direct coal liquefaction process, the liquid phase inside the thermal high-pressure separator is a solid-liquid two-phase medium with high temperature, high pressure, high viscosity, and trace amounts of unreacted coal powder particles. The liquid level is generally measured using a differential pressure level gauge. The pressure tap on the positive pressure side of the level gauge is connected to the bottom liquid phase of the thermal high-pressure separator, and the pressure tap on the negative pressure side is connected to the gas phase. The liquid level is indirectly calculated using the pressure difference.

[0003] To prevent the pressure tapping pipe on the positive pressure side of the level gauge from being blocked by high-viscosity solid materials, existing technologies generally use hydrogen as a backflushing medium, continuously flowing into the pressure tapping pipe on the positive pressure side to purge the pipe wall and prevent deposits from adhering. However, this method has certain problems in actual operation: On the one hand, a large amount of low-temperature hydrogen is directly injected into the bottom of the high-temperature hot high-efficiency separator, and after contacting the heavy oil phase, it cools down rapidly, causing the heavy components to separate and the viscosity to increase sharply, accelerating the formation of bottom deposits and frequently causing problems such as pump cavitation, pipeline blockage, and even unplanned shutdowns of the unit; on the other hand, the cold purge gas forms bubbles in the liquid phase, interfering with the stable transmission of liquid level static pressure, causing differential pressure signal fluctuations and liquid level measurement distortion; in addition, the purge gas flow may also scour the inlet of the pressure tapping pipe, causing local erosion or turbulence, further reducing the measurement accuracy.

[0004] Therefore, although the existing positive pressure side blowing scheme can partially delay the blockage of the pressure tapping pipe, it also introduces new process risks due to the introduction of cold medium. It not only fails to fundamentally solve the contradiction between "blowing to prevent blockage" and "bottom to prevent deposition", but also fails to guarantee the accuracy of the measurement.

[0005] In summary, existing methods for measuring the coal slurry level inside thermal high-efficiency separators suffer from problems such as bottom sedimentation caused by purging gas and poor accuracy in level measurement, which urgently need to be addressed. Summary of the Invention

[0006] This invention provides a separator liquid level measuring device and a separator liquid level measuring method to at least solve the problems of bottom sedimentation caused by purging gas and poor liquid level measurement accuracy in the existing methods for measuring the liquid level of coal slurry inside a hot high-performance separator.

[0007] To address the aforementioned problems, according to one aspect of the present invention, a separator level measuring device is provided, comprising a pressurization assembly, a pipeline assembly, a differential pressure measuring device, and a thermal high-pressure separator; the pipeline assembly includes a first pipeline and a second pipeline, the first pipeline being connected to the pressurization assembly, the positive pressure end of the differential pressure measuring device, and the interior of the thermal high-pressure separator; the first pipeline is used to transport light materials; the second pipeline is connected to the negative pressure end of the differential pressure measuring device and the interior of the thermal high-pressure separator, and is used to transport purge gas to the top cavity of the thermal high-pressure separator; the pressurization assembly is used to drive the light materials through the first pipeline to the bottom of the thermal high-pressure separator; wherein, the light materials are gaseous substances that do not react with the substances inside the thermal high-pressure separator; the differential pressure measuring device detects the liquid level height in the thermal high-pressure separator by the pressure difference between the positive and negative pressure ends.

[0008] Furthermore, one end of the first pipeline extends into the thermal high-pressure separator, and this end has a reduced-diameter fitting; the positive pressure end is connected to the first pipeline between the pressurization component and the reduced-diameter fitting; wherein, the reduced-diameter fitting includes a first section and a second section connected in sequence, one end of the first section is connected to the pressurization component, the other end of the first section is connected to one end of the second section, and the other end of the second section is positioned towards the bottom of the thermal high-pressure separator; the internal dimensions of the first section are larger than the internal dimensions of the second section, so that the flow area of ​​the first section is larger than the flow area of ​​the second section.

[0009] Furthermore, the differential pressure measuring device includes a positive pressure side tap and a negative pressure side tap; the positive pressure end is located on the positive pressure side tap; the negative pressure end is located on the negative pressure side tap, and the negative pressure side tap is connected to the middle of the second pipeline; the liquid level inside the thermal high-pressure separator divides the interior of the thermal high-pressure separator vertically into a liquid phase layer and a gas phase layer, with the gas phase layer located above the liquid phase layer; the positive pressure side tap is connected to the liquid phase layer through the first pipeline to monitor the liquid phase layer pressure, and the negative pressure side tap is connected to the gas phase layer through the second pipeline to monitor the gas phase layer pressure.

[0010] Furthermore, the separator level measuring device also includes a buffer tank assembly; the buffer tank assembly is disposed on the first pipeline and is located between the pressurization assembly and the positive pressure end of the differential pressure measuring device, and the buffer tank assembly is used to contain liquid light materials.

[0011] Furthermore, the separator level measuring device also includes check valves; there are at least two check valves, one of which is located on the first pipeline and between the positive pressure end and the end of the first pipeline connected to the thermal high-pressure separator, and the other of which is located on the second pipeline and between the negative pressure end and the end of the second pipeline connected to the thermal high-pressure separator; the check valves are used to prevent the material in the thermal high-pressure separator from flowing back into the differential pressure measuring device.

[0012] Furthermore, the pressurization assembly includes a light air source and a booster pump. The light air source is connected to the first pipeline and is used to supply light materials into the first pipeline. The booster pump is connected to the first pipeline and is used to drive the flow of light materials.

[0013] Furthermore, the purging gas is hydrogen; the separator level measuring device also includes a hydrogen source, which is connected to the second pipeline to supply hydrogen to the second pipeline; the middle part of the second pipeline is connected to the negative pressure end of the differential pressure measuring device.

[0014] Furthermore, the separator level measuring device also includes a flow meter, which is installed on the first pipeline and is used to detect the flow rate of light materials in the first pipeline; and / or, the flow meter is installed on the second pipeline and is used to detect the flow rate of purge gas in the second pipeline.

[0015] According to another aspect of the present invention, a separator liquid level measurement method is provided, which is applied to the above-mentioned separator liquid level measurement device. The separator liquid level measurement method includes the following steps: controlling the pressure of the light material after being pressurized by the pressurization component to be higher than the internal pressure of the thermal high-pressure separator, driving the light material to enter the interior of the thermal high-pressure separator along the first pipeline and enter the liquid at the bottom; controlling the purging gas to enter the interior of the thermal high-pressure separator along the second pipeline, but not entering the liquid at the bottom; and using a differential pressure measuring device to detect the liquid level height inside the thermal high-pressure separator by the pressure difference between the positive pressure end and the negative pressure end.

[0016] Furthermore, when blockage or scaling occurs at the connection between the first pipeline and the thermal high-pressure separator, the pressurization component is controlled to pressurize the light material and flush the positive pressure end of the first pipeline and / or the differential pressure measuring device to remove the blockage or scaling.

[0017] The present invention provides a separator liquid level measuring device, comprising a pressurization assembly, a pipeline assembly, a differential pressure measuring device, and a thermal high-pressure separator; the pipeline assembly includes a first pipeline and a second pipeline, the first pipeline being connected to the pressurization assembly, the positive pressure end of the differential pressure measuring device, and the interior of the thermal high-pressure separator; the first pipeline is used to transport light materials; the second pipeline is connected to the negative pressure end of the differential pressure measuring device and the interior of the thermal high-pressure separator, and is used to transport purge gas to the top cavity of the thermal high-pressure separator; the pressurization assembly is used to drive the light materials through the first pipeline to the bottom of the thermal high-pressure separator; wherein, the light materials are gaseous substances that do not react with the substances inside the thermal high-pressure separator; the differential pressure measuring device detects the liquid level height in the thermal high-pressure separator by the pressure difference between the positive and negative pressure ends.

[0018] This invention utilizes a pressurization component to drive lightweight materials through a first pipeline to the bottom of a thermal high-efficiency separator, while a second pipeline delivers purge gas only to the top cavity of the separator. This allows the positive pressure end of a differential pressure gauge to sense the static pressure from the lightweight materials at the bottom, and the negative pressure end to sense the pressure of the gas phase at the top. The difference between these two pressures is used to monitor the liquid column height within the thermal high-efficiency separator. The lightweight material is a gaseous substance that does not react with the coal slurry or other substances inside the separator; it has low density and good fluidity, reducing the risk of solid particle deposition and pipeline scaling and blockage caused by the direct entry of purge gas into the bottom of the separator, a problem common with traditional methods. The invention eliminates the risks associated with traditional methods for measuring the level of coal slurry in thermal high-pressure separators. Furthermore, the differential pressure measuring device of this invention monitors the difference between the static pressure of the liquid column and the pressure of the gas phase. By replacing conventional purge gas with a lightweight material, it reduces the interference of sediment at the bottom of the thermal high-pressure separator on the monitoring of the liquid phase pressure, thereby improving the accuracy and stability of the differential pressure signal and reducing the impact of media adhesion, blockage, or flow on the monitoring data of the differential pressure measuring device. This invention has a simple structure and low cost, is easy to assemble and maintain, and solves the problems of bottom sedimentation caused by purge gas and poor accuracy of level measurement in existing methods for measuring the level of coal slurry inside thermal high-pressure separators. It is suitable for large-scale application. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0020] Figure 1 A partial structural schematic diagram of the separator level measuring device provided in an embodiment of the present invention is shown;

[0021] Figure 2 The embodiments of the present invention are shown. Figure 1 A magnified view of a section of the reduced diameter pipe fitting.

[0022] The above figures include the following reference numerals:

[0023] 10. Boosting assembly;

[0024] 20. Check valve;

[0025] 30. Piping assembly; 31. First piping; 32. Second piping; 33. Reduced diameter fitting; 331. First section; 332. Second section;

[0026] 40. Differential pressure measuring instrument; 41. Positive pressure side pressure tap; 42. Negative pressure side pressure tap;

[0027] 50. Thermal high-speed separator; 51. Liquid phase layer; 52. Gas phase layer;

[0028] 60. Buffer tank assembly;

[0029] 70. Flow meter. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a separator liquid level measuring device, including a pressurization assembly 10, a pipeline assembly 30, a differential pressure measuring device 40, and a thermal high-pressure separator 50; the pipeline assembly 30 includes a first pipeline 31 and a second pipeline 32, the first pipeline 31 being connected to the pressurization assembly 10, the positive pressure end of the differential pressure measuring device 40, and the interior of the thermal high-pressure separator 50 respectively; the first pipeline 31 is used to transport light materials; the second pipeline 32 is connected to the negative pressure end of the differential pressure measuring device 40 and the interior of the thermal high-pressure separator 50 respectively, and is used to transport purge gas to the top cavity of the thermal high-pressure separator 50; the pressurization assembly 10 is used to drive the light materials to be transported through the first pipeline 31 to the bottom of the thermal high-pressure separator 50; wherein, the light materials are gaseous substances that do not react with the substances inside the thermal high-pressure separator 50; the differential pressure measuring device 40 detects the liquid level height in the thermal high-pressure separator 50 by the pressure difference between the positive pressure end and the negative pressure end.

[0032] By setting up a pressurization component 10, the light material is driven to be transported to the bottom of the thermal high-performance separator 50 through the first pipeline 31. At the same time, the purging gas is delivered only to the top cavity of the thermal high-performance separator 50 through the second pipeline 32. This allows the positive pressure end of the differential pressure measuring device 40 to sense the static pressure from the light material at the bottom, and the negative pressure end to sense the gas phase pressure at the top. The liquid column height inside the thermal high-performance separator 50 is monitored by the pressure difference between the two. The light material is a gaseous substance that does not react with the coal slurry or other substances inside the thermal high-performance separator 50. It has low density and good fluidity, which reduces the deposition of solid particles and scaling and blockage of pipelines caused by the direct entry of traditional purging gas into the bottom of the thermal high-performance separator 50. The invention reduces the risk of blockage; and the differential pressure measuring device 40 of the present invention monitors the difference between the static pressure of the liquid column and the pressure of the gas phase, and reduces the interference of deposits at the bottom of the thermal high-pressure separator 50 on the pressure monitoring of the liquid phase layer 51 by replacing the conventional purging gas with a light material, thereby improving the accuracy and stability of the differential pressure signal and reducing the impact of medium adhesion, blockage or flow on the monitoring data of the differential pressure measuring device 40; the present invention has a simple structure and low cost, is easy to assemble and maintain, and solves the problems of bottom deposition caused by purging gas and poor accuracy of liquid level measurement in the existing technology for measuring the liquid level of coal slurry inside the thermal high-pressure separator 50, making it suitable for large-scale promotion and use.

[0033] like Figure 1 and Figure 2 As shown, one end of the first pipe 31 extends into the thermal high-pressure separator 50, and this end has a reduced-diameter pipe fitting 33; the positive pressure end is connected to the first pipe 31 between the pressurization assembly 10 and the reduced-diameter pipe fitting 33; wherein, the interior of the reduced-diameter pipe fitting 33 includes a first section 331 and a second section 332 connected in sequence, one end of the first section 331 is connected to the pressurization assembly 10, and the other end of the first section 331 is connected to one end of the second section 332, and the other end of the second section 332 is set towards the bottom of the thermal high-pressure separator 50; the internal size of the first section 331 is larger than the internal size of the second section 332, so that the flow area of ​​the first section 331 is larger than the flow area of ​​the second section 332.

[0034] One end of the first pipeline 31 extends into the thermal high-pressure separator 50, and this end is equipped with a reduced-diameter fitting 33. When the light material driven by the pressurization component 10 flows along the first pipeline 31, it has already been connected to the differential pressure measuring device 40 through the positive pressure end before reaching the reduced-diameter fitting 33, so that the differential pressure detection point is located between the positive pressure end of the differential pressure measuring device 40 and the reduced-diameter fitting 33. The first section 331 and the second section 332 inside the reduced-diameter fitting 33 are connected in sequence, wherein the flow area of ​​the first section 331 is larger than that of the second section 332. When the light material enters the second section 332 with a narrower cross section after flowing through the first section 331, the flow rate and pressure stability of the light material are improved. This reduces the risk of turbulence, backflow, or air pocket accumulation caused by the sudden increase in flow area after light materials enter the bottom of the thermal high-pressure separator 50. This allows light materials to continuously and stably fill to the end of the first pipeline 31 and form a continuous liquid column. This liquid column transmits the static pressure of the liquid level in the thermal high-pressure separator 50 to the positive pressure end of the differential pressure measuring device 40, while the purging gas is transported to the top cavity of the thermal high-pressure separator 50 through the second pipeline 32, thereby obtaining a stable gas phase reference pressure. The pressure difference signal between the two can thus remain stable, improving the accuracy and reliability of liquid level measurement and solving the problem of liquid level detection data distortion caused by pressure fluctuations.

[0035] like Figure 1 As shown, the differential pressure measuring device 40 includes a positive pressure side pressure tap 41 and a negative pressure side pressure tap 42; the positive pressure end is located on the positive pressure side pressure tap 41; the negative pressure end is located on the negative pressure side pressure tap 42, and the negative pressure side pressure tap 42 is connected to the middle of the second pipeline 32; the liquid level inside the thermal high-pressure separator 50 divides the interior of the thermal high-pressure separator 50 into a liquid phase layer 51 and a gas phase layer 52 in the vertical direction, and the gas phase layer 52 is located above the liquid phase layer 51; the positive pressure side pressure tap 41 is connected to the liquid phase layer 51 through the first pipeline 31 to monitor the pressure of the liquid phase layer 51, and the negative pressure side pressure tap 42 is connected to the gas phase layer 52 through the second pipeline 32 to monitor the pressure of the gas phase layer 52.

[0036] The differential pressure measuring device 40 clearly separates the acquisition paths of the differential pressure signal by setting a positive pressure side pressure tap 41 and a negative pressure side pressure tap 42. The negative pressure side pressure tap 42 is connected to the middle of the second pipeline 32, ensuring that when the purging gas is delivered to the top gas phase layer 52 of the thermal high-pressure separator 50 via the second pipeline 32, its pressure is directly transmitted to the negative pressure end of the differential pressure measuring device 40 through the negative pressure side pressure tap 42, avoiding pressure fluctuations caused by branches or stagnation in the gas path. At the same time, the positive pressure side pressure tap 41 is connected to the liquid inside the thermal high-pressure separator 50 through the first pipeline 31. The liquid phase layer 51 is directly connected, allowing the static pressure of the liquid phase layer 51 to be directly transmitted to the positive pressure end. The pressure of the gas phase layer 52 is monitored by connecting it to the negative pressure side pressure tap 42 through the second pipeline 32. Since the liquid level inside the thermal high-pressure separator 50 divides the cavity into the lower liquid phase layer 51 and the upper gas phase layer 52, the differential pressure measured by the differential pressure measuring device 40 is determined by the difference between the liquid static pressure of the liquid phase layer 51 and the gas pressure of the gas phase layer 52. This reduces the influence of the purging airflow on the accuracy of liquid level measurement and improves the accuracy and stability of liquid level height detection.

[0037] like Figure 1 As shown, the separator level measuring device also includes a buffer tank assembly 60; the buffer tank assembly 60 is disposed on the first pipeline 31, and the buffer tank assembly 60 is located between the pressurization assembly 10 and the positive pressure end of the differential pressure measuring device 40, and the buffer tank assembly 60 is used to contain liquid light materials.

[0038] The buffer tank assembly 60 is installed on the first pipeline 31 and located between the pressurization assembly 10 and the positive pressure end of the differential pressure measuring device 40. It contains liquid light materials. When the pressurization assembly 10 drives the light materials to be transported through the first pipeline 31, the buffer tank assembly 60 absorbs and offsets the instantaneous impact and flow rate changes caused by the pressure fluctuations of the output pressure of the pressurization assembly 10 through the stable liquid column formed by the liquid light materials. This ensures a continuous and uniform supply of light materials to the positive pressure end of the differential pressure measuring device 40, thereby stabilizing the measurement pressure at the positive pressure end, reducing the interference of pressure fluctuations caused by the susceptibility of gaseous materials to system disturbances on the accuracy of liquid level detection, and improving the accuracy and reliability of liquid level measurement in the thermal high-pressure separator 50.

[0039] like Figure 1 As shown, the separator level measuring device also includes a check valve 20; there are at least two check valves 20, one check valve 20 is installed on the first pipeline 31 and is located between the positive pressure end and the connection end between the first pipeline 31 and the thermal high-pressure separator 50, and the other check valve 20 is installed on the second pipeline 32 and is located between the negative pressure end and the connection end between the second pipeline 32 and the thermal high-pressure separator 50; the check valve 20 is used to prevent the material in the thermal high-pressure separator 50 from flowing back into the differential pressure measuring device 40.

[0040] Check valve 20 is installed on the first pipeline 31 and located between the positive pressure end of the differential pressure measuring device 40 and the connection end between the first pipeline 31 and the thermal high-pressure separator 50. At the same time, another check valve 20 is installed on the second pipeline 32 and located between the negative pressure end of the differential pressure measuring device 40 and the connection end between the second pipeline 32 and the thermal high-pressure separator 50. This arrangement can prevent heavy materials or purging gas in the thermal high-pressure separator 50 from flowing back into the differential pressure measuring device 40 under system pressure fluctuations, instantaneous back pressure, or shutdown conditions. This avoids the measuring element from being blocked, contaminated, or damaged due to contact with high-viscosity deposits or corrosive media, thereby improving the long-term stable operation capability and liquid level detection accuracy of the differential pressure measuring device 40, and enhancing the reliability and safety of the entire liquid level measuring device under complex operating conditions.

[0041] like Figure 1 As shown, the booster assembly 10 includes a light air source and a booster pump. The light air source is connected to the first pipeline 31 and is used to supply light materials into the first pipeline 31. The booster pump is connected to the first pipeline 31 and is used to drive the flow of light materials.

[0042] The booster assembly 10 includes a light gas source and a booster pump. The light gas source is connected to the first pipeline 31 and is used to continuously supply gaseous light materials that do not react with the substances inside the thermal high-pressure separator 50. The booster pump is connected to the first pipeline 31 and is used to drive the light materials to flow along the first pipeline 31 to the bottom of the thermal high-pressure separator 50, thereby forming a continuous and stable gaseous medium flow in the first pipeline 31. This avoids direct contact between the heavy coal slurry in the thermal high-pressure separator 50 and the positive pressure end of the differential pressure measuring device 40. At the same time, when the supply of light materials is interrupted or the pressure fluctuates, it reduces the risk of medium loss or mixing in the positive pressure end of the differential pressure measuring device 40, ensuring that the differential pressure measuring device 40 can reflect the liquid level height in the thermal high-pressure separator 50 through the pressure difference between the positive and negative pressure ends, improving the accuracy and reliability of liquid level measurement. It also prevents the accumulation of sediment at the bottom of the thermal high-pressure separator 50 due to turbulent purging airflow, ensuring the long-term stable operation of the measurement system.

[0043] like Figure 1 As shown, the purging gas is hydrogen; the separator level measuring device also includes a hydrogen source, which is connected to the second pipeline 32 to supply hydrogen to the second pipeline 32; the middle part of the second pipeline 32 is connected to the negative pressure end of the differential pressure measuring device 40.

[0044] The purging gas is hydrogen, and the hydrogen source is connected to the second pipeline 32 to stably supply hydrogen into the second pipeline 32, ensuring that the purging gas composition is consistent and the flow rate is controllable, avoiding interference from other gas impurities on the pressure detection at the negative pressure end of the differential pressure measuring device 40. At the same time, the middle part of the second pipeline 32 is directly connected to the negative pressure end of the differential pressure measuring device 40, so that hydrogen is preferentially and stably injected into the negative pressure end before entering the top cavity of the thermal high-pressure separator 50, forming a continuous and uniform gas phase pressure compensation environment. This improves the accuracy and reliability of the differential pressure measuring device 40 in monitoring the liquid level height in the thermal high-pressure separator 50 through the pressure difference between the positive and negative pressure ends, ensuring the long-term stability and authenticity of liquid level monitoring under high temperature and high pressure conditions.

[0045] like Figure 1 As shown, the separator level measuring device also includes a flow meter 70, which is installed on the first pipeline 31 and is used to detect the flow rate of light materials in the first pipeline 31; and / or, the flow meter 70 is installed on the second pipeline 32 and is used to detect the flow rate of purge gas in the second pipeline 32.

[0046] A flow meter 70 is installed on the first pipeline 31 to monitor the flow rate of light material delivered to the bottom of the thermal high-pressure separator 50. Through this flow feedback, the output parameters of the booster assembly 10 can be further adjusted to ensure that the light material continuously and stably flushes the positive pressure end of the differential pressure measuring device 40, isolating the positive pressure end of the differential pressure measuring device 40 from the heavy coal slurry in the thermal high-pressure separator 50, and avoiding pipeline blockage or signal lag. At the same time, the flow meter 70 can also be installed on the second pipeline 32 to monitor the supply flow rate of the purging gas, so that the purging gas enters the top cavity of the thermal high-pressure separator 50 at a constant flow rate, forming a stable air curtain barrier, preventing the pressure monitoring data of the negative pressure end of the differential pressure measuring device 40 from being distorted due to condensation or scaling of the low-temperature medium. This ensures that the differential pressure signal obtained by the differential pressure measuring device 40 can accurately reflect the liquid level change in the thermal high-pressure separator 50, and improves the stability and accuracy of the liquid level measurement.

[0047] The present invention also provides a separator liquid level measurement method, which is applied to the above-mentioned separator liquid level measurement device. The separator liquid level measurement method includes the following steps: controlling the pressure of the light material after being pressurized by the pressurization component 10 to be higher than the internal pressure of the thermal high-pressure separator 50, driving the light material to enter the interior of the thermal high-pressure separator 50 along the first pipeline 31 and into the liquid at the bottom; controlling the purging gas to enter the interior of the thermal high-pressure separator 50 along the second pipeline 32, but not into the liquid at the bottom; and the differential pressure measuring device 40 to detect the liquid level height inside the thermal high-pressure separator 50 by the pressure difference between the positive pressure end and the negative pressure end.

[0048] By controlling the pressurization component 10 to increase the pressure of the light material to a level higher than the internal pressure of the thermal high-pressure separator 50, the light material is driven to continuously flow into the bottom liquid phase of the thermal high-pressure separator 50 along the first pipeline 31, forming a stable oil column and avoiding direct contact between the heavy material and the positive pressure end of the differential pressure measuring device 40. At the same time, the purging gas is controlled to be introduced into the top of the thermal high-pressure separator 50 along the second pipeline 32. Thus, when the differential pressure measuring device 40 detects the liquid level through the pressure difference between the positive and negative pressure ends, it effectively prevents the deposition of heavy material in the thermal high-pressure separator 50 and blockage of the positive pressure end of the differential pressure measuring device 40, reduces the interference of cold gas on the viscosity and flowability of the bottom material, improves the stability and accuracy of liquid level measurement, and improves the gas-liquid separation efficiency and overall reliability of the device in the thermal high-pressure separator 50.

[0049] like Figure 1 As shown, when blockage or scaling occurs at the connection between the first pipeline 31 and the thermal high-pressure separator 50, the pressurization component 10 is controlled to pressurize the light material and flush the positive pressure end of the first pipeline 31 and / or the differential pressure measuring device 40 to remove the blockage or scaling.

[0050] When the connection between the first pipeline 31 and the thermal high-pressure separator 50 becomes blocked or scaled due to the accumulation of heavy materials, the pressure applied to the light materials by the booster component 10 is increased. This causes the light materials to flow at high speed along the first pipeline 31 to the bottom of the thermal high-pressure separator 50 with kinetic energy higher than the normal operating pressure. The impact force directly acts on the connection between the first pipeline 31 and the thermal high-pressure separator 50 and the internal channel of the positive pressure end of the differential pressure measuring device 40, thereby flushing and cleaning the scale and restoring the unobstructed pressure channel. This ensures that the positive pressure end of the differential pressure measuring device 40 can accurately monitor the static pressure of the liquid at the bottom of the thermal high-pressure separator 50, avoiding level measurement distortion caused by blockage. At the same time, the purging gas continues to be introduced into the top of the thermal high-pressure separator 50 along the second pipeline 32 to maintain the pressure stability of the negative pressure end. This allows the differential pressure measuring device 40 to continue to perform normal level detection function after the positive pressure end is restored, improving the reliability and level measurement stability of the system during long-term operation.

[0051] The working process and principle of a specific embodiment of the present invention will now be described in detail as follows:

[0052] Firstly, the differential pressure measuring device 40 in this invention is based on the principle of hydrostatics:

[0053] ;

[0054] Where ρ is the density of the medium, g is the acceleration due to gravity, and h is the liquid level. The liquid level in the thermal high-pressure separator 50 can be calculated by measuring the pressure difference ΔP between the positive and negative pressure sections of the differential pressure measuring device 40.

[0055] When the separator level measuring device is working, the pressurization component 10 drives the light material to be transported through the first pipeline 31, making the pressure of the light material higher than the internal pressure of the thermal high-pressure separator 50. The light material flows along the first pipeline 31, passing sequentially through the buffer tank assembly 60 and the positive pressure end of the differential pressure measuring device 40, and then enters the liquid phase layer 51 at the bottom of the thermal high-pressure separator 50 through the reduced-diameter pipe fitting 33 at the end of the first pipeline 31. The reduced-diameter pipe fitting 33 includes a first section 331 and a second section 332 connected in sequence. The flow area of ​​the first section 331 is larger than that of the second section 332. After flowing through the first section 331, the light material enters the second section 332 with a narrower cross-section, increasing the flow rate and stabilizing the pressure, ensuring that the light material continuously and stably fills the liquid phase layer 51 at the bottom of the thermal high-pressure separator 50. A continuous liquid column is formed at the end of a pipe 31; this liquid column accurately transmits the static pressure of the liquid phase layer 51 in the thermal high-pressure separator 50 to the positive pressure end of the differential pressure measuring device 40; at the same time, a hydrogen gas source provides purge gas to the second pipe 32, and the purge gas is transported through the second pipe 32 to the gas phase layer 52 at the top of the thermal high-pressure separator 50. The middle part of the second pipe 32 is connected to the negative pressure end of the differential pressure measuring device 40, so that the purge gas preferentially enters the negative pressure end of the differential pressure measuring device 40 before entering the gas phase layer 52, forming a continuous and uniform gas phase pressure compensation environment, accurately transmitting the pressure of the gas phase layer 52 to the negative pressure end of the differential pressure measuring device 40; the differential pressure measuring device 40 detects the liquid level height of the liquid phase layer 51 in the thermal high-pressure separator 50 by the pressure difference between the positive pressure end and the negative pressure end. A pressure-sensing pipeline filled with purging gas is connected to the negative pressure chamber interface of the thermal high-pressure level gauge and connected to the top of the thermal high-pressure level gauge. The gas phase pressure of the thermal high-pressure level gauge is measured, and the liquid level of the thermal high-pressure level gauge is measured by the pressure difference between the positive and negative pressure chambers.

[0056] When blockage or scaling occurs at the connection between the first pipeline 31 and the thermal high-pressure separator 50, the pressurization component 10 pressurizes the light material, causing it to flow at high speed along the first pipeline 31 with kinetic energy higher than the normal operating pressure. This flushes the positive pressure end of the first pipeline 31 and the differential pressure measuring device 40 to remove blockage or scaling. A check valve 20 is installed on the first pipeline 31 and located between the positive pressure end of the differential pressure measuring device 40 and the connection end between the first pipeline 31 and the thermal high-pressure separator 50. Simultaneously, another check valve... The backflow valve 20 is installed on the second pipeline 32 and located between the negative pressure end of the differential pressure measuring device 40 and the connection end between the second pipeline 32 and the thermal high-pressure separator 50, preventing the material in the thermal high-pressure separator 50 from flowing back into the differential pressure measuring device 40; the flow meter 70 is installed on the first pipeline 31 to monitor the flow rate of the light material in the first pipeline 31, or installed on the second pipeline 32 to detect the flow rate of the purging gas in the second pipeline 32, so as to realize the monitoring and control of the flow rate of the light material or the purging gas.

[0057] In summary, this invention provides a separator liquid level measuring device and a separator liquid level measuring method. By setting up a pressurization component 10 to drive light materials to the bottom of the thermal high-efficiency separator 50 via a first pipeline 31, and simultaneously using a second pipeline 32 to deliver purge gas only to the top cavity of the thermal high-efficiency separator 50, the positive pressure end of the differential pressure measuring device 40 senses the static pressure from the light materials at the bottom, while the negative pressure end senses the gas phase pressure at the top. The liquid column height inside the thermal high-efficiency separator 50 is monitored by the pressure difference between the two. The light materials are gaseous substances that do not react with coal slurry or other substances inside the thermal high-efficiency separator 50; they have low density and good fluidity, reducing the direct entry of traditional purge gas into the bottom of the thermal high-efficiency separator 50. This invention reduces the risk of solid particle deposition and pipeline scaling and blockage caused by the purging gas. Furthermore, the differential pressure measuring device 40 of this invention monitors the difference between the static pressure of the liquid column and the pressure of the gas phase. By replacing conventional purging gas with a lightweight material, it reduces the interference of deposits at the bottom of the thermal high-pressure separator 50 on the pressure monitoring of the liquid phase layer 51, improving the accuracy and stability of the differential pressure signal and reducing the impact of media adhesion, blockage, or flow on the monitoring data of the differential pressure measuring device 40. This invention has a simple structure and low cost, is easy to assemble and maintain, and solves the problems of bottom deposition caused by purging gas and poor accuracy of liquid level measurement in existing methods for measuring the coal slurry level inside the thermal high-pressure separator 50. It is suitable for large-scale promotion and use.

[0058] The technical features of the embodiments described above can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification.

[0059] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0060] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0061] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0062] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0063] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A separator liquid level measuring device, characterized in that, It includes a pressurization assembly (10), a pipeline assembly (30), a differential pressure measuring device (40), and a thermal high-efficiency separator (50); the pipeline assembly (30) includes a first pipeline (31) and a second pipeline (32), the first pipeline (31) being connected to the pressurization assembly (10), the positive pressure end of the differential pressure measuring device (40), and the interior of the thermal high-efficiency separator (50); the first pipeline (31) is used to transport lightweight materials; The second pipeline (32) is connected to the negative pressure end of the differential pressure measuring device (40) and the interior of the thermal high-pressure separator (50) respectively, and is used to transport the purging gas to the top cavity of the thermal high-pressure separator (50); the pressurization component (10) is used to drive the light material to be transported to the bottom of the thermal high-pressure separator (50) through the first pipeline (31); wherein, the light material is a gaseous substance that does not react with the substances inside the thermal high-pressure separator (50); the differential pressure measuring device (40) detects the liquid level height in the thermal high-pressure separator (50) by the pressure difference between the positive pressure end and the negative pressure end.

2. The separator level measuring device according to claim 1, characterized in that, One end of the first pipe (31) extends into the thermal high-density separator (50), and this end has a reduced-diameter fitting (33); the positive pressure end is connected to the first pipe (31) between the pressurizing component (10) and the reduced-diameter fitting (33); wherein, the interior of the reduced-diameter fitting (33) includes a first section (331) and a second section (332) connected in sequence, one end of the first section (331) is connected to the pressurizing component (10), the other end of the first section (331) is connected to one end of the second section (332), and the other end of the second section (332) is disposed towards the bottom of the thermal high-density separator (50); the internal size of the first section (331) is larger than the internal size of the second section (332) so that the flow area of ​​the first section (331) is larger than the flow area of ​​the second section (332).

3. The separator level measuring device according to claim 2, characterized in that, The differential pressure measuring device (40) includes a positive pressure side pressure tap (41) and a negative pressure side pressure tap (42); the positive pressure end is located on the positive pressure side pressure tap (41); the negative pressure end is located on the negative pressure side pressure tap (42), and the negative pressure side pressure tap (42) is connected to the middle of the second pipeline (32); the liquid level inside the thermal high-pressure separator (50) divides the interior of the thermal high-pressure separator (50) vertically into a liquid phase layer (51) and a gas phase layer (52), and the gas phase layer (52) is located above the liquid phase layer (51); the positive pressure side pressure tap (41) is connected to the liquid phase layer (51) through the first pipeline (31) to monitor the pressure of the liquid phase layer (51), and the negative pressure side pressure tap (42) is connected to the gas phase layer (52) through the second pipeline (32) to monitor the pressure of the gas phase layer (52).

4. The separator level measuring device according to claim 1, characterized in that, The separator level measuring device further includes a buffer tank assembly (60); the buffer tank assembly (60) is disposed on the first pipeline (31), and the buffer tank assembly (60) is located between the pressurization assembly (10) and the positive pressure end of the differential pressure measuring device (40), and the buffer tank assembly (60) is used to contain the liquid light material.

5. The separator level measuring device according to claim 1, characterized in that, The separator level measuring device also includes a check valve (20); there are at least two check valves (20), one of which is located on the first pipeline (31) and between the positive pressure end and the end of the first pipeline (31) connected to the thermal high-pressure separator (50), and the other of which is located on the second pipeline (32) and between the negative pressure end and the end of the second pipeline (32) connected to the thermal high-pressure separator (50); the check valve (20) is used to prevent the material in the thermal high-pressure separator (50) from flowing back into the differential pressure measuring device (40).

6. The separator level measuring device according to claim 1, characterized in that, The booster assembly (10) includes a light gas source and a booster pump. The light gas source is connected to the first pipeline (31) and is used to supply the light material into the first pipeline (31). The booster pump is connected to the first pipeline (31) and is used to drive the flow of the light material.

7. The separator level measuring device according to claim 1, characterized in that, The purging gas is hydrogen; the separator level measuring device also includes a hydrogen source, which is connected to the second pipeline (32) and is used to supply hydrogen to the second pipeline (32); The middle part of the second pipeline (32) is connected to the negative pressure end of the differential pressure measuring device (40).

8. The separator level measuring device according to claim 1, characterized in that, The separator level measuring device further includes a flow meter (70), which is installed on the first pipeline (31) and is used to detect the flow rate of the light material in the first pipeline (31); and / or, the flow meter (70) is installed on the second pipeline (32) and is used to detect the flow rate of the purging gas in the second pipeline (32).

9. A method for measuring the liquid level in a separator, characterized in that, The separator level measurement method is applied to the separator level measurement device according to any one of claims 1 to 8. The separator level measurement method includes the following steps: controlling the pressure of the light material after being pressurized by the pressurizing component (10) to be higher than the internal pressure of the thermal high-pressure separator (50), driving the light material to enter the interior of the thermal high-pressure separator (50) along the first pipeline (31) and enter the liquid at the bottom; controlling the purging gas to enter the interior of the thermal high-pressure separator (50) along the second pipeline (32) and not enter the liquid at the bottom; the differential pressure measuring device (40) detects the liquid level height of the liquid in the thermal high-pressure separator (50) by the pressure difference between the positive pressure end and the negative pressure end.

10. The separator level measurement method according to claim 9, characterized in that, When blockage or scaling occurs at the connection between the first pipeline (31) and the thermal high-pressure separator (50), the pressurization component (10) is controlled to pressurize the light material and flush the positive pressure end of the first pipeline (31) and / or the differential pressure measuring device (40) to remove the blockage or scaling.

Images