Flash tank for natural gas desulfurization

Abstract

The utility model discloses a flash tank for natural gas desulfurization, which comprises a tank body, a tank top and a tank bottom which are separated and are fixedly connected through bolts, a liquid distribution disc is arranged in the tank body, the side face of the liquid distribution disc penetrates through the tank body and is connected with a feeding pipe, a plurality of liquid distribution nozzles are arranged below the liquid distribution disc, and an evaporation tower is arranged below the liquid distribution nozzles; an evaporation opening, a gas collecting cover and a gas outlet pipe are arranged in the tank top; a liquid collecting surface and a liquid outlet pipe are arranged at the tank bottom, and a foot stool is arranged at the bottom of the tank bottom and is higher than the liquid outlet pipe. By arranging a brand new structure, waste heat generated in the natural gas extraction process can be well utilized, a gas-liquid separator is better achieved, and the natural gas production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of natural gas production equipment, in particular to the technical field of natural gas flash desulfurization, and specifically relates to a flash tank used for natural gas desulfurization. Background Art

[0002] During the natural gas extraction process, natural gas processing plants and other production facilities have the problem of tail gas emissions during the production process. Natural gas processing plants urgently need to deeply treat the exhaust gas to meet the emission requirements. The current common method is to burn the exhaust gas, but the waste heat generated by the combustion is not fully utilized. The flash tank is also a common equipment for natural gas extraction and processing. The high-pressure and high-temperature fluid is decompressed and enters the flash tank. Since the boiling point drops after decompression, the fluid temperature is higher than the boiling point, which will cause the natural gas fluid to vaporize in the flash tank and separate into two phases. Therefore, the flash tank is an important equipment for providing rapid vaporization of the fluid and realizing gas-liquid separation. However, during the operation of the existing flash tank, it is generally directly heated and separated after entering the space, resulting in a relatively small flash area, and it is not possible to obtain good heating, and heating equipment is often used for heating. If the waste heat of the tail gas can be utilized, it will greatly save costs. Utility Model Content

[0003] In view of the above problems, the utility model provides a flash tank for natural gas desulfurization, which can make good use of the waste heat generated in natural gas extraction by setting up a new structure, and better realize the gas-liquid separator to improve the natural gas production efficiency.

[0004] The specific scheme of the utility model is as follows:

[0005] A flash tank for natural gas desulfurization comprises a separate tank body, a tank top and a tank bottom, which are fixedly connected by bolts; a liquid separation plate is arranged in the tank body, the side of the liquid separation plate passes through the tank body to connect with a feed pipe, a plurality of liquid separation nozzles are arranged below the liquid separation plate, and an evaporation tower is arranged below the liquid separation nozzle; an evaporation port, a gas collecting cover and an air outlet pipe are arranged in the tank top; a liquid collecting surface and a liquid outlet pipe are arranged at the tank bottom, and a tripod is arranged at the bottom of the tank bottom, and the height of the tripod is greater than the liquid outlet pipe.

[0006] The evaporation tower is a hollow tower body with multiple layers nested and reduced in size from the outside to the inside. Each layer of the evaporation tower is a cone with an arc-shaped top surface. Each layer of the evaporation tower is provided with a liquid permeable hole passing through the surface, so that the liquid on the outside of the evaporation tower can flow into the inside.

[0007] A plurality of horizontal grooves as deceleration grooves are arranged on the outer side of each layer of the evaporation tower, and the liquid permeable holes are in the deceleration grooves.

[0008] Furthermore, the deceleration groove is an inwardly curved structure.

[0009] Furthermore, a plurality of heat exchange tubes are provided on the inner side of the evaporation tower from top to bottom, the top of the heat exchange tube is connected to the heat exchange inlet tube, and the bottom is connected to the heat exchange outlet tube, and both the heat exchange inlet tube and the heat exchange outlet tube pass through the wall of the tank body and are connected to the outside; the heat exchange inlet tube longitudinally passes through the top of all the evaporation towers and is connected to the top of the heat exchange tube, and the heat exchange outlet tube is horizontally connected to the bottom of all the evaporation towers and is connected to the bottom end of the heat exchange tube, and the heat exchange medium enters the heat exchange tube through the heat exchange inlet tube and flows into the heat exchange outlet tube to realize heat exchange.

[0010] Furthermore, a tower support frame is provided in the tank body, and the tower support frame is a hollow structure for installing the evaporation tower and the heat exchange outlet pipe.

[0011] Furthermore, a plurality of liquid separation nozzles are provided below the liquid separation plate.

[0012] Furthermore, the bottom of the tripod is a flat plate structure with a hole for connecting with the skid body.

[0013] Furthermore, a layer of spring pad is provided on the tripod.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The solution of the utility model can increase the contact area, make the range of gas-liquid separation larger, and make it easier to achieve the evaporation of each after separation, thus achieving the effect of a flash tank.

[0016] 2. By designing the specific structure of the evaporation tower, the contact area can be further increased and a more efficient heat exchange can be achieved, while facilitating the discharge of liquid and the evaporation of gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the internal cross-sectional structure of the utility model.

[0018] Figure 2 This is a schematic diagram of the external three-dimensional structure of the evaporation tower.

[0019] Figure 3 for Figure 2 main view.

[0020] Figure 4 for Figure 2 Bottom view of .

[0021] In the figure:

[0022] 1 tank body, 2 tank top, 3 evaporation port, 4 gas collecting cover, 5 gas outlet pipe, 6 liquid distribution plate, 7 liquid distribution nozzle, 8 evaporation tower, 9 tower support frame, 10 heat exchange inlet pipe, 11 heat exchange outlet pipe, 12 tank bottom, 13 liquid collecting surface, 14 tripod, 15 spring pad, 16 liquid outlet pipe,

[0023] 81 deceleration groove, 82 heat exchange tube, 83 liquid permeable hole. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] A flash tank for natural gas desulfurization, such as Figure 1 , including a separate tank body 1, a tank top 2, and a tank bottom 12, which are fixedly connected by bolts; a liquid separation plate 6 is arranged in the tank body 1, and the side of the liquid separation plate 6 passes through the tank body 1 to connect the feed pipe, and a plurality of liquid separation nozzles 7 are arranged below the liquid separation plate 6, and an evaporation tower 8 is arranged below the liquid separation nozzle 7; an evaporation port 3, an air collecting cover 4, and an air outlet pipe 5 are arranged in the tank top 2; a liquid collecting surface 13 and a liquid outlet pipe 16 are arranged in the tank bottom 12, and a tripod 14 is arranged at the bottom of the tank bottom 12, and the height of the tripod 14 is greater than the liquid outlet pipe 16.

[0026] Preferably, a metal sheet with a shutter-like structure may be provided in the evaporation port 3 to assist condensation, so that the steam in part of the gas can be condensed and then converged and flowed down again.

[0027] like Figure 2-4 As shown, the evaporation tower 8 is a hollow tower body with multiple layers of nesting that shrink from the outside to the inside. Each layer of the evaporation tower 8 is a cone with a circular arc-shaped top surface. Each layer of the evaporation tower 8 is provided with a liquid permeable hole 83 passing through the surface, so that the liquid on the outside of the evaporation tower 8 can flow into the inside. A plurality of horizontal grooves are provided on the outside of each layer of the evaporation tower 8 as a deceleration groove 81, and the liquid permeable hole 83 is inside the deceleration groove 81. The deceleration groove 81 is an inward arc structure. And, preferably, the size of the deceleration groove 81 from top to bottom is getting larger and larger, and similarly, the size of each layer of the liquid permeable hole 83 from top to bottom is also getting larger and larger, which is convenient for multi-stage diversion of liquid.

[0028] Furthermore, the inner side of the evaporation tower 8 is provided with a plurality of heat exchange pipes 82 from top to bottom, the top of the heat exchange pipe 82 is connected to the heat exchange inlet pipe 10, and the bottom is connected to the heat exchange outlet pipe 11, the heat exchange inlet pipe 10 and the heat exchange outlet pipe 11 are both connected to the external heat exchange medium source through the wall of the tank body 1 and receive the heat exchange medium after heat exchange; the heat exchange inlet pipe 10 vertically passes through the top of all evaporation towers 8 and is connected to the top of the heat exchange pipe 82, the heat exchange outlet pipe 11 horizontally connects the bottom of all evaporation towers 8 and is connected to the bottom of the heat exchange pipe 82, and the heat exchange medium enters the heat exchange pipe 82 through the heat exchange inlet pipe 10 and then flows into the heat exchange outlet pipe 11 to realize heat exchange. With such a design, the heat energy generated by the combustion of natural gas exhaust gas can be poured into the heat exchange inlet pipe 10 through the heat exchange medium such as hot water, and then enter the heat exchange pipe 82 and be evenly distributed to the radial heat exchange pipe 82, and finally converge to an outlet at the bottom through the annular heat exchange pipe 82 at the bottom, and then connected to the heat exchange outlet pipe 11 for discharge.

[0029] Furthermore, a tower support frame 9 is provided in the tank body 1 . The tower support frame 9 is a hollow structure, which does not hinder the upper liquid from flowing downward, and can be used to install and fix the evaporation tower 8 and the heat exchange outlet pipe 11 .

[0030] Preferably, a plurality of liquid separation nozzles 7 are provided below the liquid separation plate 6, so that the liquid can be evenly distributed on the surface of the outermost evaporation tower 8. Particularly preferably, the liquid separation nozzles 7 can be directed toward different surface areas of the evaporation tower 8. The liquid separation plate is also provided with a plurality of perforations (not shown in the figure) to allow the gas below to pass upward.

[0031] Preferably, the bottom of the tripod 14 is a flat plate structure with a hole for connecting with the skid. Generally, the evaporation tube is arranged on the skid structure, and such a design can ensure a stable connection. Furthermore, a layer of spring pad 15 is arranged on the tripod 14, and the spring pad 15 is a commonly used shock-absorbing spiral spring structure. This is convenient for reducing the synchronous vibration of the device when other skid devices vibrate during use, and maintaining internal stability.

[0032] The method of using the utility model is as follows:

[0033] The utility model is installed on the skid body through the tripod 14; the natural gas raw material is sent from the liquid separation plate 6 to the liquid separation nozzle 7 and sprayed downward, and is separated after passing through the evaporation tower 8. The gas is sent out from the upper part through the evaporation port 3, the gas collecting cover 4, and the gas outlet pipe 5 in sequence, and the liquid is gathered from the liquid collecting surface 13 and sent away from the liquid outlet pipe 16.

[0034] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flash tank for natural gas desulfurization, characterized in that: The invention comprises a separate tank body (1), a tank top (2), and a tank bottom (12), which are fixedly connected by bolts; a liquid separation plate (6) is provided in the tank body (1), the side of the liquid separation plate (6) passes through the tank body (1) and is connected to a feed pipe; a plurality of liquid separation nozzles (7) are provided below the liquid separation plate (6), and an evaporation tower (8) is provided below the liquid separation nozzles (7); an evaporation port (3), an air collecting cover (4), and an air outlet pipe (5) are provided in the tank top (2); a liquid collecting surface (13) and a liquid outlet pipe (16) are provided in the tank bottom (12); a tripod (14) is provided at the bottom of the tank bottom (12), and the height of the tripod (14) is greater than the liquid outlet pipe (16); The evaporation tower (8) is a hollow tower body with multiple layers of nested structures that are gradually reduced in size from the outside to the inside. Each layer of the evaporation tower (8) is a conical body with a circular arc-shaped top surface. Each layer of the evaporation tower (8) is provided with a liquid permeable hole (83) passing through the surface, so that the liquid on the outside of the evaporation tower (8) can flow into the inside. A plurality of horizontal grooves as deceleration grooves (81) are provided on the outside of each layer of the evaporation tower (8), and the liquid permeable holes (83) are located in the deceleration grooves (81).

2. A flash tank for natural gas desulfurization according to claim 1, characterized in that: The deceleration groove (81) is an inwardly-pointing arc-shaped structure.

3. A flash tank for natural gas desulfurization according to claim 2, characterized in that: A plurality of heat exchange tubes (82) are provided on the inner side of the evaporation tower (8) from top to bottom. The top of the heat exchange tube (82) is connected to the heat exchange inlet tube (10), and the bottom is connected to the heat exchange outlet tube (11). Both the heat exchange inlet tube (10) and the heat exchange outlet tube (11) pass through the wall of the tank body (1) and are connected to the outside. The heat exchange inlet tube (10) passes through the top of all the evaporation towers (8) longitudinally and is connected to the top of the heat exchange tube (82). The heat exchange outlet tube (11) is horizontally connected to the bottom of all the evaporation towers (8) and is connected to the bottom of the heat exchange tube (82). The heat exchange medium enters the heat exchange tube (82) through the heat exchange inlet tube (10) and then flows into the heat exchange outlet tube (11) to realize heat exchange.

4. A flash tank for natural gas desulfurization according to claim 3, characterized in that: A tower support frame (9) is provided in the tank body (1); the tower support frame (9) is a hollow structure and is used for installing an evaporation tower and a heat exchange outlet pipe (11).

5. A flash tank for natural gas desulfurization according to claim 4, characterized in that: A plurality of liquid separation nozzles (7) are provided below the liquid separation plate (6).

6. A flash tank for natural gas desulfurization according to claim 1, characterized in that: The bottom of the tripod (14) is a flat plate structure with a hole, which is used to be connected to the skid body.

7. A flash tank for natural gas desulfurization according to claim 6, characterized in that: A layer of spring pad (15) is provided on the tripod (14).

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