A compact gas deep and efficient deliquescence device and method

Abstract

The present invention discloses a compact device and method for deep and efficient deliquidation of gas, which is mainly composed of a vertical shell, a conical liquid collection chamber, a condensation heat exchange zone and an enhanced separation zone. In addition to the U-shaped plate heat exchanger, the condensation heat exchange zone also includes a corrugated (folded) plate gas-liquid separator and a staggered rectangular baffle; the enhanced separation zone is composed of a single or multiple spiral-type cyclone plate-type coupled cyclone separators, which are fixed in the middle of the shell by fixed isolation plate I, fixed isolation plate II and fixed isolation plate III. The present invention utilizes the method of condensation heat exchange to condense the gaseous liquid in the gas into droplets, and then deeply and efficiently removes the liquid from the gas by coupling a variety of separation technologies such as inertial separation and cyclone separation. The present invention effectively combines condensation heat exchange technology, inertial separation technology and cyclone separation technology to enhance the gas-liquid separation process, thereby achieving the purpose of efficient and deep deliquidation of the gas.

Description

Technical Field

[0001] The present invention relates to a compact method and device for deep and efficient gas dehydration. Specifically, the gas deep dehydration device involved in the present invention can be applied to gas-liquid separation processes in many fields such as chemical industry, petroleum, natural gas extraction, biology, environmental protection, thermal systems, etc. Background Art

[0002] As one of the important operating units, gas-liquid separation is widely used in various fields, such as oil extraction, nuclear energy development, wet desulfurization and hydrocarbon gas cleaning. The depth and efficiency of gas-liquid separation will directly affect the product quality and quality of the chemical production process. For example, in the development of nuclear energy, the separation of gas and liquid is very important to ensure the safety of nuclear power plants; hydrocarbon gas compressors are key equipment for pressurization and transportation, and their operation safety is directly related to the entire production process. The problem of hydrocarbon gas carrying liquid will seriously affect the stable operation and operation cycle of the compressor. Therefore, it is very necessary to design an efficient gas-liquid separation device, which is of great significance to the green and sustainable development of my country's petrochemical industry.

[0003] At present, there are many methods for gas-liquid separation. According to the different mechanisms of gas-liquid separation, they can be divided into gravity sedimentation separation, filtration separation, inertial separation, electrostatic separation and centrifugal separation technology. The principle of gravity sedimentation separation is mainly to complete the separation process through a long sedimentation time and the density difference between the gas and liquid phases. In the current actual production, gravity sedimentation separation technology is the simplest separation technology, but this technology has the disadvantages of long consumption time, low separation efficiency and large equipment volume. Inertial separation technology is a gas-liquid separation operation using some baffles, corrugated plates, etc. When the gas and liquid phases enter the separator at a certain speed, they will rush to the baffle and make a sharp turn under the action of inertial motion. Due to its large inertia, the liquid phase still maintains its original motion trajectory, while the gas phase moves in the direction of the designed physical structure, so that the trajectory of the liquid phase is different from that of the gas phase to achieve the effect of separation. However, when the gas velocity is large, a "secondary entrainment" phenomenon will occur, resulting in a decrease in its gas-liquid separation efficiency. In summary, the method of separating liquid droplets from gas only by gravity or inertial force has certain limitations.

[0004] The Chinese invention patent (CN115155111A) provides a gas-liquid separation device, which is mainly composed of a sealed cylinder, a gas flow pipe and a spiral that runs through the top and bottom. It has a simple structure and can improve the separation efficiency to a certain extent. Although the device can effectively separate gas and liquid, the separation accuracy is still not very high. It cannot be used in high-precision separation scenarios and has a narrow scope of application.

[0005] In order to improve the efficiency of gas-liquid separation, the present invention sets a condensation heat exchange zone before the separation zone, and uses condensation heat exchange to cool the gas in the pipeline, further condense the gaseous liquid into droplets, and then couples the existing cyclone separation means to improve the gas-liquid separation efficiency. Therefore, in view of the deficiencies of existing separation technologies and the needs of engineering projects, the present invention couples condensation heat exchange technology, inertial separation technology and centrifugal separation technology, and while making up for the deficiencies between the technologies, it also achieves the separation of different droplet particle sizes and expands the scope of application. The present invention has developed a green, efficient, high-separation-precision, and widely applicable gas deliquidation device, which is of great significance for improving the efficiency of the production process, reducing floor space, and reducing energy consumption in the production process. Summary of the invention

[0006] In view of the problems existing in the above-mentioned prior art, the present invention provides a compact method and device for deep and efficient deliquescence of gas, which can be applied to gas-liquid separation processes in many fields such as chemical industry, petroleum, natural gas extraction, biology, environmental protection, thermal systems, etc.

[0007] In order to achieve the above-mentioned object, the present invention provides a compact gas deep and efficient deliquoring device, characterized in that the device comprises a vertical shell and a conical liquid collecting chamber, a condensation heat exchange zone and an enhanced separation zone located in the vertical shell from bottom to top;

[0008] The top of the vertical shell is provided with a gas outlet, and the bottom end of the conical liquid collecting chamber is provided with a liquid outlet;

[0009] The condensation heat exchange zone is located at the upper part of the conical liquid collecting chamber, and includes a U-shaped plate heat exchanger and a corrugated (folded) plate type gas-liquid separator connected to the upper part thereof, and a heat insulation material wrapping the U-shaped plate heat exchanger and the corrugated (folded) plate type gas-liquid separator; a rectangular baffle is provided at the opening of the U-shaped plate heat exchanger; a mixed gas inlet is provided at the lower part of the U-shaped plate heat exchanger, and a mixed gas outlet extends from the corrugated (folded) plate type gas-liquid separator into the bottom of the enhanced separation zone, a coolant inlet is located at the upper side of the condensation heat exchange zone, and a coolant outlet is provided at the bottom of the condensation heat exchange zone;

[0010] The enhanced separation zone is located above the condensation heat exchange zone, and mainly includes a screw-type cyclone plate coupled cyclone separator and a fixed isolation plate. The screw-type cyclone plate coupled cyclone separator includes a screw-type cyclone separator fixed at the bottom by fixed isolation plates III and II, and a cyclone plate gas-liquid separator fixed at the top by fixed isolation plate I. The screw-type cyclone separator is composed of two screw-type cyclone separators connected in parallel and distributed in the same conical shell. The bottom flow port at the bottom end of the conical shell is located below the fixed isolation plate III at the bottom of the enhanced separation zone, and the upper air inlet is located above the fixed isolation plate III. The upper part of the screw-type cyclone separator has an overflow port extending above the fixed isolation plate II.

[0011] There is a through liquid channel I between the condensation heat exchange zone and the conical liquid collecting chamber, and there is a through liquid channel II between the enhanced separation zone, the condensation heat exchange zone and the conical liquid collecting chamber.

[0012] The present invention also provides a compact gas deep and efficient deliquoring method, characterized in that the mixed gas enters the U-shaped plate heat exchanger from the mixed gas inlet, and at the same time, the coolant flows into the heat exchange and cooling zone through the coolant inlet, and flows out from the coolant outlet after heat exchange with the mixed gas in the U-shaped plate heat exchanger; after the mixed gas undergoes heat exchange, part of the gaseous liquid condenses into liquid droplets, and the gas carrying the tiny droplets then enters the channel formed by the corrugated plate, moves in a curve, and begins to perform primary gas-liquid separation; finally, after the corrugated (folded) plate separation, the The gas enters the enhanced separation zone from the mixed gas outlet, passes through the spiral cyclone separator through the air inlet, and the large-size droplets move downward along the trajectory of the spiral pipe, are discharged from the bottom flow outlet at the bottom of the conical shell, and then flow into the conical liquid collecting chamber along the liquid channel I; while the gas moves upward from the overflow port with tiny droplets, continues to generate cyclone motion after passing through the cyclone plate gas-liquid separator, and further separates the tiny droplets in depth. Finally, the separated gas is discharged from the gas outlet, and the liquid flows from the liquid channel II to the conical liquid collecting chamber, and all the liquid is finally discharged from the liquid outlet.

[0013] Furthermore, the coolant injected from the coolant inlet is selected from one of alcohol type, glycerin type and ethylene glycol type coolants.

[0014] Furthermore, the corrugated (folded) plate type gas-liquid separator is a triangular corrugated plate separator, and its folding angle is about 30°.

[0015] Furthermore, the cyclone plate type gas-liquid separator has a blade elevation angle of 30° and 36 cyclone plate blades.

[0016] The beneficial effects of the present invention are as follows: the compact gas deep and efficient deliquoring method and device provided by the present invention couples heat exchange and cooling technology, inertial separation technology and cyclone separation technology, which not only expands the application scope of the gas-liquid separation device and reduces the equipment footprint, but also greatly enhances the gas-liquid separation effect, effectively removes the liquid in the gas, ensures the normal and efficient operation of the industrial production process, and meets the demand for high-precision and high-efficiency gas-liquid separators in industrial practical production. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of a compact gas efficient deep dehydration device designed for this invention

[0018] In the figure, 1-mixed gas inlet; 2-U-shaped plate heat exchanger; 3-rectangular baffle; 4-coolant inlet; 5-coolant outlet; 6-corrugated (folded) plate gas-liquid separator; 7-mixed gas outlet; 8-spiral-cyclone plate coupled cyclone separator; 9-fixed isolation plate I; 10-fixed isolation plate II; 11-fixed isolation plate III; 12-conical liquid collecting chamber; 13-liquid channel I; 14-liquid channel II; 15-gas outlet; 16-liquid outlet.

[0019] Figure 2a This is the front view of the condensation heat exchange area.

[0020] Figure 2b It is a side view of the condensation heat exchange area.

[0021] Figure 3 Schematic diagram of the structure of the screw channel-cyclone plate coupling cyclone separator

[0022] In the figure, 17 is a cyclone plate type gas-liquid separator; 21 is an air inlet; 19 is an underflow outlet; 20 is a spiral channel type cyclone separator; 21 is an overflow outlet. Specific implementation methods

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in combination with the embodiments of the present invention and the accompanying drawings.

[0024] Embodiment 1:

[0025] A natural gas purification plant in Chongqing City has tried out the compact gas deep and efficient deliquescence device of the present invention to purify the natural gas in the plant, remove water vapor and gas and liquid impurities in the natural gas, and improve the quality and safety of the natural gas.

[0026] The specific implementation status and results are as follows:

[0027] (1) Operating conditions: The composition of the purified natural gas is 92% natural gas, 5% water vapor and 3% liquid impurities; the processing capacity is 2×10 4 m 3 / d, the coolant is composed of water and ethylene glycol, and the flow rate is 3.5×10 4 m 3 / d, the operating environment temperature is 25℃.

[0028] (2) Implementation process:

[0029] The mixed natural gas first enters the condensation heat exchange area through the air inlet, and then passes through the U-shaped plate heat exchanger in the condensation heat exchange area to exchange heat and cool down with the coolant in the area, so that most of the gaseous liquid in the gas is condensed into droplets, and then enters the corrugated (folded) plate gas-liquid separation area. The gas and droplets move in a curve in the channel formed by the corrugated plate. Due to the effects of centrifugal force, inertia force and adhesion, the droplets cannot flow and deflect and hit the wall of the corrugated plate, and the gas moves along the channel. At this time, the first step of gas-liquid separation begins; the gas that has undergone primary separation then enters the spiral cyclone separator In the spiral cyclone separator, large-size droplets are thrown to the wall of the device under the action of centrifugal force, move downward along the trajectory of the spiral pipe, and are discharged from the ground flow port at the bottom of the cone; while the gas carries tiny liquids out from the overflow port, and finally continues to generate cyclone motion after passing through the cyclone plate gas-liquid separator, further separating the tiny droplets, thereby achieving deep separation of water vapor and other liquid impurities in natural gas. Finally, the purified natural gas is discharged from the upper gas outlet, and the liquid treated by the spiral-cyclone plate separator flows through the pipeline to the conical liquid collecting chamber, and is finally discharged from the liquid outlet.

[0030] (3) Implementation results:

[0031] Through the compact gas deep and efficient deliquoring method and device of the present invention, the effect of removing droplets with a particle size of more than 5 μm is finally as high as more than 99.94%. That is, under the operating conditions, the liquid content of the purified natural gas is about 4%.

[0032] Embodiment 2:

[0033] In a petrochemical plant in Shanghai, the compact gas deep and efficient liquid removal device of the present invention is applied to the transportation process of mixed hydrocarbon gases, deeply and efficiently removing liquid from the mixed hydrocarbon gases, and improving the stable operation and operation cycle of the hydrocarbon gas compressor.

[0034] The specific implementation status and results are as follows:

[0035] (1) Operating conditions: The hydrocarbon gas to be purified is mainly composed of 54% propane, 30% n-butene, 13% n-butane and 3% other gases; the operating temperature is 29°C, the processing capacity is 2800kg / h; the coolant is composed of water and ethylene glycol, and the flow rate is 3.5×10 3 m 3 / h.

[0036] (2) Implementation process:

[0037] The hydrocarbon gas first enters the condensation heat exchange area through the air inlet, and the coolant enters the condensation heat exchange area through the liquid inlet. The gas passes through the U-shaped plate heat exchanger in the condensation heat exchange area to exchange heat and cool down with the coolant in the area, so that most of the gaseous liquid in the gas condenses into droplets, and then enters the corrugated (folded) plate gas-liquid separation area. The gas and droplets move in a curve in the channel formed by the corrugated plate. Due to the effects of centrifugal force, inertia force and adhesion, the droplets cannot flow and deflect and hit the wall of the corrugated plate, and the gas moves along the channel. At this time, the first step of gas-liquid separation begins; the gas that has undergone primary separation is immediately Then it enters the screw-channel cyclone separator, where large-size droplets are thrown to the wall of the device under the action of centrifugal force, move downward along the trajectory of the spiral pipe, and are discharged from the ground flow port at the bottom of the cone; while the gas carries tiny liquid out from the overflow port, and finally continues to generate cyclone motion after passing through the cyclone plate type gas-liquid separator, further separating the tiny droplets, thereby achieving deep separation of liquid in hydrocarbon gas, and finally the purified hydrocarbon gas is discharged from the upper gas outlet, and the liquid treated by the screw-channel cyclone plate separator flows through the pipeline to the conical liquid collecting chamber, and is finally discharged from the liquid outlet.

[0038] (3) Implementation results:

[0039] The compact gas deep and efficient liquid removal device of the present invention is used to purify hydrocarbon gas, and the removal rate of droplets with a particle size of more than 5 μm reaches more than 99.9%. Compared with the previous equipment of this factory, the efficiency is improved by about 80%.

Claims

1. A compact gas deep and efficient deliquoring device, characterized in that: The device comprises a vertical shell and a conical liquid collecting chamber, a condensation heat exchange area and an enhanced separation area located in the vertical shell from bottom to top; The top of the vertical shell is provided with a gas outlet, and the bottom end of the conical liquid collecting chamber is provided with a liquid outlet; The condensation heat exchange zone is located at the upper part of the conical liquid collecting chamber, and includes a U-shaped plate heat exchanger and a corrugated folded plate type gas-liquid separator connected to the upper part thereof, and a heat insulation material layer wrapping the U-shaped plate heat exchanger and the corrugated folded plate type gas-liquid separator; a rectangular baffle is provided at the opening of the U-shaped plate heat exchanger; a mixed gas inlet is provided at the lower part of the U-shaped plate heat exchanger, and a mixed gas outlet extends from the corrugated folded plate type gas-liquid separator into the bottom of the enhanced separation zone, a coolant inlet is located at the upper side of the condensation heat exchange zone, and a coolant outlet is provided at the bottom of the condensation heat exchange zone; The enhanced separation zone is located above the condensation heat exchange zone, and mainly includes a screw-type cyclone plate coupled cyclone separator and a fixed isolation plate. The screw-type cyclone plate coupled cyclone separator includes a screw-type cyclone separator fixed at the bottom by fixed isolation plates III and II, and a cyclone plate gas-liquid separator fixed at the top by fixed isolation plate I. The screw-type cyclone separator is composed of two screw-type cyclone separators connected in parallel and distributed in the same conical shell. The bottom flow port at the bottom end of the conical shell is located below the fixed isolation plate III at the bottom of the enhanced separation zone, and the upper air inlet is located above the fixed isolation plate III. The upper part of the screw-type cyclone separator also has an overflow port extending above the fixed isolation plate II. There is a through liquid channel I between the condensation heat exchange zone and the conical liquid collecting chamber, and there is a through liquid channel II between the enhanced separation zone, the condensation heat exchange zone and the conical liquid collecting chamber.

2. The device according to claim 1, characterized in that The corrugated folded plate type gas-liquid separator is a triangular corrugated plate separator, and its folding angle is about 30°.

3. The device according to claim 1, characterized in that The cyclone plate type gas-liquid separator has a blade elevation angle of 30° and 36 cyclone plate blades.

4. A compact gas deep and efficient deliquoring method using the device of claim 1, characterized in that: The mixed gas enters the U-shaped plate heat exchanger from the mixed air inlet. At the same time, the coolant flows into the heat exchange and cooling zone through the coolant inlet, and flows out from the coolant outlet after heat exchange with the mixed gas in the U-shaped plate heat exchanger; after the mixed gas undergoes heat exchange, part of the gaseous liquid condenses into liquid droplets, and the gas carrying tiny droplets then enters the channel formed by the corrugated plate, moves in a curve, and begins primary gas-liquid separation; finally, the gas after the corrugated folded plate separation enters the enhanced separation zone from the mixed gas outlet, passes through the air inlet and passes through the spiral cyclone separator, and the large-size droplets move downward along the trajectory of the spiral pipe, are discharged from the bottom flow port at the bottom of the conical shell, and then flow into the conical liquid collecting chamber along the liquid channel I; and the gas moves upward from the overflow port with tiny droplets, and continues to generate cyclonic motion after passing through the cyclone plate gas-liquid separator, further deeply separating the tiny droplets, and finally the separated gas is discharged from the gas outlet, and the liquid flows from the liquid channel II to the conical liquid collecting chamber, and all the liquid is finally discharged from the liquid outlet.

5. The compact gas deep and efficient deliquoring method according to claim 4, characterized in that: The coolant is selected from one of alcohol type, glycerin type and ethylene glycol type coolants.

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