Novel gas-liquid cyclone separator

Abstract

The invention relates to gas-liquid phase separation equipment, and particularly discloses a novel gas-liquid cyclone separator which comprises a gas-liquid inlet pipe, a gas outlet pipe, a liquid-urine outlet pipe, a lower cone, a straight cylinder section and an upper seal head, the lower end of the upper sealing head is connected with the straight cylinder section, and the upper end of the upper sealing head is connected with the gas outlet pipe; and the lower end of the lower cone is connected with a urine outlet pipe. The straight cylinder section is divided into a liquid phase straight cylinder section and a gas phase straight cylinder section. The length of the gas straight tube section is less than or equal to that of the liquid-phase straight tube section. The upper end of the upper end socket is connected with a gas outlet pipe to form an upper end socket cone angle, and the upper end socket cone angle is 60-120 degrees. A vortex breaking device is arranged at the position, connected with the urine outlet pipe, of the lower cone. According to the invention, the problem of wall attachment of the upper end socket of the two-stage evaporation separator in the evaporation process of the urea device is effectively solved, and long-period operation of the equipment is ensured.

Description

Technical Field

[0001] This invention relates to a gas-liquid phase separation device, and more particularly to a gas-liquid phase separation device that uses negative pressure evaporation for gas-liquid separation, but the liquid phase exhibits cooling and crystallization properties. Background Technology

[0002] Currently, in both international and domestic chemical urea plants, the second-stage evaporator separators used for evaporation and concentration processes all exhibit wall buildup on the inner wall of the upper head.

[0003] like Figure 1 As shown, the existing two-stage evaporator separator has: a gas-liquid inlet pipe 1, a gas outlet pipe 2, a liquid-urea outlet pipe 3, a lower cone 4, a straight section 5, and an upper end cap 6. After heating, the urea solution or a gas-liquid mixture of the urea solution enters the two-stage evaporator separator tangentially through the gas-liquid inlet pipe 1. It moves tangentially along the inner wall of the container. Under the influence of centrifugal force and gravity, the liquid portion of the gas-liquid mixture flows along the inner wall of the container towards the bottom and exits the separator through the liquid-urea outlet pipe 3. The gas phase and fine droplets of the gas-liquid mixture move upwards in the middle of the container and exit the separator from the gas phase outlet 2. During the above gas-liquid cyclone separation process, the gas phase often carries a large amount of fine, easily crystallizing liquid components. The upper end cap 6 is a circular end cap, and a relatively stagnant area forms in the upper part of the gas. This area easily forms a condensation of urea and its byproducts on the inner wall of the upper end cap, which can severely block the gas outlet.

[0004] Existing methods for dealing with wall buildup all involve rinsing with the steam condensate from this device. There are various ways to rinse with condensate. If the amount of rinsing water is too small, the wall buildup will not be washed off. If the amount of rinsing water is too large, a large amount of water will enter the separator. The water entering the separator absorbs heat from the liquid phase and vaporizes, causing the temperature of the liquid phase to drop. Alternatively, a large number of wall buildup blocks may fall and block the pump or equipment pipes, forcing the device to stop. This results in fluctuations in product quality and increased energy consumption. Summary of the Invention

[0005] The technical problem to be solved by this invention is how to prevent liquid droplets in the gas phase from crystallizing and forming on the vessel wall, thereby ensuring the stable operation of subsequent production processes.

[0006] To solve the above-mentioned technical problems, the present invention provides a novel gas-liquid cyclone separator, which includes: a gas-liquid inlet pipe, a gas outlet pipe, a liquid outlet pipe, a lower cone, a straight section, and an upper end cap;

[0007] The upper end cap is a cone, the lower end of the upper end cap is connected to the straight section, and the upper end of the upper end cap is connected to the gas outlet pipe;

[0008] The lower end of the straight section is connected to the lower vertebral body, and the lower end of the lower vertebral body is connected to the urine outlet tube.

[0009] As a further technical solution, the straight cylinder section is divided into a liquid phase straight cylinder section and a gas phase straight cylinder section. The lower end of the liquid phase straight cylinder section is connected to the lower cone body, and the upper end of the gas phase straight cylinder section is connected to the lower end of the upper end cap.

[0010] As a further technical solution, the length of the gas phase straight cylinder section is less than or equal to that of the liquid phase straight cylinder section.

[0011] As a further technical solution, the upper end of the upper end cap is connected to the gas outlet pipe to form an upper end cap cone angle, the size of which is 60-120 degrees.

[0012] As a further technical solution, the liquid outlet of the lower vertebra is equipped with a vortex-breaking device.

[0013] The beneficial effects of this invention are:

[0014] This invention changes the upper structure of the urea cyclone separator by setting the upper end cap as a cone. Combined with the design principle of the cyclone separator, it greatly reduces the gas turbulence space above the equipment, effectively solving the problem of wall formation on the upper end cap of the second-stage evaporation separator in the urea plant evaporation process, and ensuring the long-term operation of the equipment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of an existing two-stage evaporator separator.

[0016] Figure 2 This is a schematic diagram of an embodiment of the present invention.

[0017] Figure label:

[0018] 1. Gas-liquid inlet pipe, 2. Gas outlet pipe, 3. Liquid outlet pipe, 4. Lower cone body, 5. Straight cylinder section, 6. Upper head, 7. Liquid phase straight cylinder section, 8. Gas phase straight cylinder section, 9. Vortex breaking device, 10. Upper head cone body angle. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 2 As shown, an embodiment of the present invention provides a novel gas-liquid cyclone separator comprising: a gas-liquid inlet pipe 1, a gas outlet pipe 2, a liquid outlet pipe 3, a lower cone 4, a straight section 5, and an upper end cap 6.

[0021] The upper end cap 6 is a cone shape. The lower end of the upper end cap 6 is connected to the straight section 5, and the upper end of the upper end cap 6 is connected to the gas outlet pipe 2.

[0022] The lower end of the straight section 5 is connected to the lower vertebral body 4, and the lower end of the lower vertebral body 4 is connected to the urine outlet tube 3.

[0023] In one embodiment, the straight section 5 is divided into a liquid phase straight section 7 and a gas phase straight section 8. The lower end of the liquid phase straight section 7 is connected to the lower cone 4, and the upper end of the gas phase straight section 8 is connected to the lower end of the upper end cap 6. The presence of the straight section ensures the cyclone separation of the gas and liquid phases. Cyclone separation is the tangential movement of the gas and liquid phases along the inner wall of the container. The liquid flows downward along the container wall due to gravity and centrifugal force, while the gas moves upward along the middle. Without the straight section, cyclone separation would not occur.

[0024] In one embodiment, the length of the gas phase straight section 8 is less than or equal to that of the liquid phase straight section 7. A length less than or equal to that of the liquid phase straight section facilitates gas-liquid cyclone separation and allows for rapid gas collection along the middle of the outlet pipe.

[0025] In one embodiment, the upper end of the upper head 6 is connected to the gas outlet pipe 2 to form an upper head cone angle 10. Preferably, the upper head cone angle is 60-120 degrees, and the size of the upper head cone angle 10 is determined according to the diameter of the gas phase outlet pipe.

[0026] In one embodiment, a vortex-breaking device 9 is provided at the connection point between the lower vertebral body 4 and the urine outlet pipe 3. The specific structure of the vortex-breaking device 9 can be any existing vortex-breaking device, and will not be described in detail here.

[0027] The principle of this invention is:

[0028] Existing cyclone separator designs are all based on gas-solid two-phase media. The lower part is the solid phase, which is convenient for solid flow, so the lower part is mostly in the form of a cone. The upper part is designed as a head, which is hemispherical or spherical. The gas phase runs upward in the middle. The upper head is equipped with an outlet pipe, and the lower opening of the outlet pipe is higher than the gas-solid inlet.

[0029] The evaporator separator of the urea plant has always followed the design principle of the cyclone separator for gas-liquid separation. Because the gas phase contains liquid, and the droplets will crystallize when they are cooled, the inner tube inside the upper head has been removed. The gas separated by the cyclone moves upward along the central axis of the equipment. Since the diameter of the upper head is the same as that of the straight section, a stagnant layer or a very slow flow rate will be formed at the wall of the equipment, which provides an opportunity for the droplets in the gas to crystallize.

[0030] by Figure 1 Taking the existing two-stage evaporator separator shown as an example, Figure 1The upper and middle end caps are spherical caps formed by an arc. Gas in the upper part forms a relatively stagnant area, which easily leads to the formation of urea and its byproducts deposited on the inner wall of the upper end cap, potentially blocking the outlet in severe cases. Traditional methods for dealing with this deposit are to periodically flush the inner wall of the upper end cap to remove it. This invention breaks with traditional thinking. Instead of flushing the inner wall, it changes the upper structure, making the upper end cap a cone. This cone shape eliminates the stagnant area within the upper end cap, and the cone shape disrupts the flow pattern of gas along the vessel wall, preventing deposit formation.

[0031] according to Figure 2 The specific operating method of this invention will be further explained as follows:

[0032] After being heated, the urea solution or the gas-liquid mixture of the urea solution enters the two-stage evaporator separator tangentially through the gas-liquid inlet pipe 1. It moves tangentially along the inner wall of the container. Affected by centrifugal force and gravity, the liquid part of the gas-liquid mixture flows along the inner wall of the container to the bottom of the container and flows out of the two-stage evaporator separator from the liquid-urea outlet pipe 3. The gas phase and fine droplets move upward in the middle of the container. The upper end cap 6 of the container is conical in shape, which greatly reduces the gas turbulence space in the upper part of the container, so that the gas phase can flow directly out of the two-stage evaporator separator from the gas phase outlet 2.

[0033] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A novel gas-liquid cyclone separator, characterized in that, It includes: Gas-liquid inlet pipe, gas outlet pipe, liquid-urine outlet pipe, lower cone, straight section and upper end cap; The upper end cap is a cone, the lower end of the upper end cap is connected to the straight section, and the upper end of the upper end cap is connected to the gas outlet pipe; The lower end of the straight section is connected to the lower vertebral body, and the lower end of the lower vertebral body is connected to the urine outlet tube.

2. The novel gas-liquid cyclone separator according to claim 1, characterized in that, The straight section is divided into a liquid phase straight section and a gas phase straight section. The lower end of the liquid phase straight section is connected to the lower cone body, and the upper end of the gas phase straight section is connected to the lower end of the upper end cap.

3. A novel gas-liquid cyclone separator according to claim 2, characterized in that, The length of the gas phase straight cylinder section is less than or equal to that of the liquid phase straight cylinder section.

4. A novel gas-liquid cyclone separator according to claim 1, 2, or 3, characterized in that, The upper end of the upper end cap is connected to the gas outlet pipe to form an upper end cap cone angle, the size of which is 60-120 degrees.

5. A novel gas-liquid cyclone separator according to claim 4, characterized in that, A vortex-breaking device is provided at the connection point between the lower vertebral body and the urine outlet pipe.

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