Novel gas-liquid cyclone separator

Abstract

The utility model 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 utility model, 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 the long-period operation of the equipment is ensured.

Description

Technical Field

[0001] The utility model relates to a gas-liquid phase separation device, in particular to a gas-liquid phase separation device which performs negative pressure evaporation gas-liquid separation but in which the liquid phase has the property of crystallization by cooling. Background Art

[0002] At present, the inner wall of the upper head of the second-stage evaporator separator in the evaporation station of evaporation and concentration in international and domestic chemical urea plants is clogged.

[0003] like Figure 1 As shown, the existing two-stage evaporation separator has: a gas-liquid inlet pipe 1, a gas outlet pipe 2, a liquid urine outlet pipe 3, a lower vertebral body 4, a straight section 5, and an upper head 6. After being heated, the urea solution or the gas-liquid mixture of the urea solution enters the two-stage evaporation separator through the gas-liquid inlet pipe 1 in the tangential direction, and moves tangentially along the inner wall of the container. Under the influence of 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 separator from the liquid urine outlet pipe 3. The gas phase and fine droplets of the gas-liquid mixture move upward in the middle of the container and are discharged from the separator from the gas phase outlet 2. In the above-mentioned gas-liquid cyclone separation process, a large amount of fine and easy-to-crystallize liquid components are often entrained in the gas phase. The upper head 6 is a circular head, and the gas will form a relatively stagnant large area at the top. This part of the area will easily form a wall of urea and its byproducts on the inner wall of the upper head, which will block the outlet of the gas pipe in severe cases.

[0004] The existing method for dealing with the wall deposition is to flush with the steam condensate of the device. There are various ways to flush with the condensate. If the amount of flushing water is small, the wall deposition cannot be flushed down. If the amount of flushing water is large, a large amount of water will enter the separator. The water entering the separator absorbs the heat of the liquid phase and vaporizes, causing the temperature of the liquid phase to drop, or a large amount of wall deposition blocks fall off to block the pump or equipment pipe mouth, and the device is forced to stop, which causes product quality fluctuations and increased energy consumption. Utility Model Content

[0005] The technical problem to be solved by the utility model is how to prevent the liquid droplets in the gas phase from forming crystals on the vessel wall, thereby ensuring the stable progress of the subsequent production process.

[0006] In order to solve the above technical problems, the utility model provides a novel gas-liquid cyclone separator, which comprises: a gas-liquid inlet pipe, a gas outlet pipe, a liquid urine outlet pipe, a lower vertebral body, a straight cylinder section and an upper head;

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

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

[0009] As a further technical solution, 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, and the upper end of the gas phase straight section is connected to the lower end of the upper head.

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

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

[0012] As a further technical solution, a vortex breaking device is provided at the liquid outlet of the lower vertebral body.

[0013] Beneficial effects of the utility model:

[0014] The utility model changes the upper structure of the urea cyclone separator, sets the upper head as a cone, combines the design principle of the cyclone separator to greatly reduce the gas turbulence space at the upper part of the equipment, effectively solves the wall formation problem of the upper head of the second-stage evaporation separator in the evaporation process of the urea device, and ensures the long-term operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of an existing two-stage evaporation separator.

[0016] Figure 2 It is a schematic structural diagram of an embodiment of the utility model.

[0017] Reference numerals:

[0018] 1. Gas-liquid inlet pipe, 2. Gas outlet pipe, 3. Liquid urine outlet pipe, 4. Lower vertebral 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 vertebral body angle. DETAILED DESCRIPTION

[0019] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0020] like Figure 2 As shown, a novel gas-liquid cyclone separator according to an embodiment of the utility model comprises: a gas-liquid inlet pipe 1, a gas outlet pipe 2, a liquid urine outlet pipe 3, a lower vertebral body 4, a straight cylinder section 5 and an upper head 6.

[0021] The upper end cap 6 is a cone, the lower end of the upper end cap 6 is connected to the straight tube 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 tube section 5 is connected to the lower vertebral body 4, and the lower end of the lower vertebral body 4 is connected to the liquid urine outlet pipe 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 head 6. The existence of the straight section ensures the cyclone separation of the gas and liquid phases. The cyclone separation is the tangential movement of the gas and liquid phases along the inner wall of the container. The liquid will flow downward along the wall due to gravity and centrifugal force, and the gas will move upward along the middle. If there is no straight section, there will be no cyclone separation.

[0024] In one embodiment, the length of the gas phase straight section 8 is less than or equal to the liquid phase straight section 7. The length of the gas phase straight section is less than or equal to the liquid phase straight section, which is beneficial to the gas-liquid cyclone separation and to the quick collection of gas along the middle into the gas 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. The preferred 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 lower vertebral body 4 connected to the liquid urine outlet pipe 3. The specific structure of the vortex breaking device 9 can be adopted from an existing vortex breaking device, and no further description is given.

[0027] The principle of this utility model is:

[0028] Existing cyclone separator designs are all designed based on gas-solid two-phase media. The lower part is the solid phase, which is mostly in the form of a cone to facilitate the flow of solids; the upper part is designed as a head, which is hemispherical or spherical, and the gas phase runs upward in the middle. An outlet inner extension pipe is provided in the upper head, and the lower pipe opening of the inner extension pipe is higher than the gas-solid inlet.

[0029] The evaporation separator of the urea plant has been following the design principle of the cyclone separator for gas-liquid separation. Because the gas phase contains liquid and the liquid droplets will crystallize when cooled, the inner extension pipe in the upper head is removed. The cyclone separation gas moves upward along the central axis of the equipment, and the diameter of the upper head is the same as that of the straight cylinder section. A retention layer will be formed on the wall or the flow rate will be very slow, which provides an opportunity for the liquid droplets in the gas to crystallize.

[0030] by Figure 1 Taking the existing two-stage evaporation separator shown as an example, Figure 1The middle upper head is a spherical cap formed by an arc, and the gas will form a relatively stagnant area in the upper part. This part of the area will easily form a wall of urea and its byproducts on the inner wall of the upper head, which will block the outlet pipe in severe cases. The traditional method of dealing with the wall on the inner wall of the upper head is to regularly flush the inner wall of the upper head to flush the wall down. The utility model breaks the traditional thinking. Instead of flushing the inner wall of the upper head, the upper structure is changed. The upper head is set to a cone. The change of the upper head to a cone shape eliminates the retention area in the upper head. The cone shape can destroy the flow pattern of the gas flowing along the wall without the possibility of forming a wall.

[0031] according to Figure 2 The specific operation mode of the utility model is further described as follows:

[0032] After being heated, the urea solution or the gas-liquid mixture of the urea solution enters the two-stage evaporation separator through the gas-liquid inlet pipe 1 in the tangential direction, and moves tangentially along the inner wall of the container. Under the influence of 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 evaporation separator from the liquid urine outlet pipe 3. The gas phase and tiny droplets move upward in the middle of the container. The upper head 6 on the upper part of the container is in a cone shape, which greatly reduces the turbulent space of the gas on the upper part of the container, so that the gas phase can directly flow out of the two-stage evaporation separator from the gas phase outlet 2.

[0033] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

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

2. A novel gas-liquid cyclone separator according to claim 1, characterized in that: 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, and the upper end of the gas phase straight cylinder section is connected to the lower end of the upper head.

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

4. A novel gas-liquid cyclone separator according to claim 1, 2 or 3, characterized in that: The upper end of the upper head is connected to the gas outlet pipe to form an upper head cone angle, and the size of the upper head cone angle 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 place where the lower vertebral body is connected to the liquid urine outlet pipe.

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