A fuel liquid removing device after stripping tower stripping

Abstract

The utility model relates to a kind of fuel liquid-removing device after stripping column stripping, especially in the technical field of chemical equipment.The utility model includes stripping column, heat exchanger, fuel gas buffer tank and boiler, the heat exchanger is connected by air inlet pipe fuel gas, and it is heated using steam, preheated fuel gas is imported from the lower part of stripping column via air outlet pipe, as stripping medium;The exhaust pipe of the top of stripping column is connected to the lower part of fuel gas buffer tank, the liquid-removing assembly of second wire mesh demister or baffle plate is equipped in the upper part in this buffer tank, top is connected boiler by the clean gas exhaust pipe with valve, bottom is connected to the spray tray by liquid return pipe;Stripping column bottom is connected boiler by the clean liquid exhaust pipe with pump and valve.The utility model is designed by double liquid-removing and condensate reflux, fundamentally solves the problem that fuel gas liquid leads to high risk of boiler operation safety, and improves resource recovery rate.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, and in particular to a fuel liquid removal device after stripping in a stripping tower. Background Technology

[0002] Stripping towers are widely used in the chemical industry. They utilize the counter-current contact between gas (such as steam) and liquid to reduce the partial pressure of components, causing them to transfer from the liquid phase to the gas phase, thus achieving separation. In a process taking propane dehydrogenation as an example, the fuel oil (mainly composed of C4 and higher heavy components) extracted from the bottom of the stripping tower is stripped to produce fuel gas that can be used as fuel.

[0003] However, during the transportation of this type of fuel gas, changes in temperature and pressure cause unvaporized heavy components or some light components to condense into droplets, resulting in "liquid-laden" fuel gas. When this liquid-laden fuel gas enters the boiler furnace, it causes abnormal temperature fluctuations, and incomplete combustion of the liquid leads to the accumulation of combustible gases in the flue gas, posing a significant safety hazard of flash explosion. Current technologies often lack specialized devices for deep purification and buffering of the stripped fuel gas, failing to address this problem at its root. Utility Model Content

[0004] (1) Technical solution To solve the above-mentioned technical problems, this utility model provides a fuel liquid removal device after stripping in a stripping tower, including a stripping tower, a heat exchanger, a fuel gas buffer tank, and a boiler. The heat exchanger is located on one side of the stripping tower, and the fuel gas buffer tank is located between the stripping tower and the boiler. The steam inlet of the heat exchanger is connected to a steam delivery pipe, and the air inlet of the heat exchanger is connected to an air inlet pipe. The air outlet is connected to the lower side of the stripping tower through an air outlet pipe. A packing layer is provided in the middle of the stripping tower, and a first wire mesh demister is provided at the top of the stripping tower. A spray plate is provided between the packing layer and the first wire mesh demister. A feed pipe is connected to one side of the spray plate. The top of the stripping tower is connected to the lower side of the fuel gas buffer tank through an exhaust pipe. A liquid removal component is provided in the upper part of the fuel gas buffer tank. The top of the fuel gas buffer tank is connected to the boiler through a purified gas discharge pipe. The bottom of the fuel gas buffer tank is connected to the other side of the spray plate through a return liquid pipe, and the other side of the bottom of the stripping tower is connected to the boiler through a purified liquid discharge pipe.

[0005] Preferably, the bottom of the heat exchanger is connected to a condensate drain pipe.

[0006] Preferably, the liquid removal component is a second wire mesh demister.

[0007] Preferably, the liquid removal component is a baffle plate, and a plurality of baffle plates are provided and staggered on the inner walls of both sides of the fuel gas buffer tank.

[0008] Preferably, the purified gas discharge pipe is equipped with a first control valve.

[0009] Preferably, the purified liquid discharge pipe is equipped with a delivery pump and a second control valve.

[0010] (2) Beneficial effects This utility model provides a fuel liquid removal device after stripping in a stripping tower. Compared with the prior art, this utility model has the following advantages: 1. By installing a first wire mesh demister at the top of the stripping tower and a dedicated fuel gas buffer tank and its internal liquid removal components outside the tower, a dual liquid removal guarantee is formed, which can effectively remove the liquid entrained in the fuel gas and the liquid condensed during transportation. This fundamentally solves the boiler temperature fluctuation and flash explosion risk caused by liquid in the fuel gas, and greatly improves the inherent safety of the system operation.

[0011] 2. The condensate at the bottom of the fuel gas buffer tank is returned to the spray plate of the stripping tower through the return pipe, so that the valuable components that have not been fully reacted (such as C4) can be stripped and recovered again, which improves the product yield, reduces material loss, and reduces the burden of waste liquid treatment.

[0012] 3. By setting up a heat exchanger, the fuel gas is preheated with steam, which improves the energy quality of the gas entering the tower and is beneficial to the stripping process; the buffer tank itself has a pressure stabilizing function and can provide a stable gas source for the boiler. The entire device has a reasonable process flow, high integration, and stable and reliable operation.

[0013] 4. This utility model has a clear structure and most of its components are mature equipment, making it particularly suitable for upgrading and modifying existing stripping towers. It has low investment costs, is easy to construct, and has significant effects. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model.

[0015] Figure 2 This is a structural schematic diagram of Embodiment 2 of the present invention.

[0016] The attached figures are labeled as follows: 1-Stripping tower, 2-Heat exchanger, 3-Fuel gas buffer tank, 4-Inlet pipe, 5-Outlet pipe, 6-Steam conveying pipe, 7-Condensate discharge pipe, 8-Spray plate, 9-Feed pipe, 10-Packing layer, 11-First wire mesh demister, 12-Exhaust pipe, 13-Liquid removal assembly, 131-Second wire mesh demister, 132-Baffle plate, 14-Purified gas discharge pipe, 141-First control valve, 15-Return pipe, 16-Purified liquid discharge pipe, 161-Second control valve, 17-Transfer pump, 18-Boiler. Detailed Implementation

[0017] The present invention will be further described in conjunction with the accompanying drawings and embodiments. Example 1

[0018] like Figure 1 As shown in this embodiment, a fuel dehydration device after stripping in a stripping tower includes a stripping tower 1, a heat exchanger 2, a fuel gas buffer tank 3, and a boiler 18. The heat exchanger 2 is located on one side of the stripping tower 1, and the fuel gas buffer tank 3 is located between the stripping tower 1 and the boiler 18. The steam inlet of the heat exchanger 2 is connected to a steam delivery pipe 6, and the air inlet of the heat exchanger 2 is connected to an air inlet pipe 4. The air outlet is connected to the lower side of the stripping tower 1 through an air outlet pipe 5. A packing layer 10 is provided in the middle of the stripping tower 1, and a first wire mesh demister is provided at the top of the stripping tower 1. 11. A spray plate 8 is provided between the packing layer 10 and the first wire mesh demister 11. A feed pipe 9 is connected to one side of the spray plate 8. The top of the stripping tower 1 is connected to the lower side of the fuel gas buffer tank 3 through an exhaust pipe 12. A liquid removal component 13 is provided in the upper part of the fuel gas buffer tank 3. The top of the fuel gas buffer tank 3 is connected to the boiler 18 through a purified gas discharge pipe 14. The bottom of the fuel gas buffer tank 3 is connected to the other side of the spray plate 8 through a return liquid pipe 15. The other side of the bottom of the stripping tower 1 is connected to the boiler 18 through a purified liquid discharge pipe 16.

[0019] The heat exchanger 2 is connected to the condensate discharge pipe 7 at the bottom, and the liquid removal component 13 is a second wire mesh demister 131; the purified gas discharge pipe 14 is provided with a first control valve 141; the purified liquid discharge pipe 16 is provided with a delivery pump 17 and a second control valve 161.

[0020] Fuel gas (light components) enters heat exchanger 2 through inlet pipe 4, and is heated after exchanging heat with steam entering through steam delivery pipe 6. The preheated fuel gas enters stripping tower 1 from the bottom through outlet pipe 5 and is used as stripping medium. The condensate generated by steam condensation is discharged through condensate discharge pipe 7.

[0021] The liquid feedstock to be processed (such as fuel oil) enters the spray plate 8 at the top of the stripping tower 1 through the feed pipe 9 and is evenly sprayed onto the packing layer 10. The liquid forms a liquid film on the surface of the packing layer 10 and flows downward, making full counter-current contact with the preheated fuel gas flowing upward in the packing layer 10. The light components in the liquid (such as C4) are further stripped and enter the gas phase. After mass transfer, the purified liquid (heavy fuel oil) is discharged from the bottom of the tower through the purified liquid discharge pipe 16, pressurized by the transfer pump 17 and regulated by the second control valve 161, and finally sent to the boiler 18 for use as liquid fuel.

[0022] The gas carrying light components rises to the top of the tower and first passes through the first wire mesh demister 11. The first wire mesh demister 11 captures and removes most of the liquid droplets and mist entrained in the gas through inertial collision and condensation, completing the first gas-liquid separation. The preliminarily purified fuel gas enters the fuel gas buffer tank 3 from the side and below through the exhaust pipe 12.

[0023] In this embodiment, the liquid removal assembly 13 at the upper part of the fuel gas buffer tank 3 is a second wire mesh demister 131. As the fuel gas rises in the tank, it passes through the second wire mesh demister 131, where residual fine droplets are further efficiently captured, achieving deep purification. The clean and dry fuel gas after secondary purification is discharged from the purified gas discharge pipe 14 at the top of the tank, and after being regulated by the first control valve 141, it is sent to the boiler 18 for combustion.

[0024] The condensate collected at the bottom of the fuel gas buffer tank 3 is transported back to the stripping tower 1 through the return pipe 15, and enters the spray plate 8 together with the fresh raw material from the feed pipe 9 for further stripping and recovery. Example 2

[0025] like Figure 2 As shown, this embodiment has the same basic structure and workflow as embodiment 1, the difference being the specific form of the liquid removal component 13 in the upper part of the fuel gas buffer tank 3.

[0026] In this embodiment, the liquid removal component 13 is a baffle plate 132, and several baffle plates 132 are provided and are staggered on the inner walls of both sides of the fuel gas buffer tank 3.

[0027] After the fuel gas enters the buffer tank from the exhaust pipe 12, it needs to repeatedly impact and bypass these staggered baffles 132 during its ascent. The gas flow direction is constantly changing, while the denser liquid droplets, due to inertia, cannot turn synchronously with the airflow, thus impacting the surface of the baffles 132, condensing, and falling, achieving gas-liquid separation. This structure is particularly suitable for operating conditions that may carry slightly larger droplets or where pressure drop requirements are not stringent, and it is not prone to clogging.

[0028] Finally, the fuel gas purified by the baffle assembly is sent to the boiler 18 through the purified gas discharge pipe 14. The condensate is also returned to the stripping tower 1 through the return pipe 15.

[0029] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0030] The embodiments described above are merely preferred embodiments of the present invention, and are described in a relatively specific and detailed manner. However, the present invention is not limited to these embodiments. It should be noted that for those skilled in the art, any improvements made without departing from the spirit of the present invention fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A fuel liquid removal device after stripping in a stripping tower, characterized in that, The system includes a stripping tower (1), a heat exchanger (2), a fuel gas buffer tank (3), and a boiler (18). The heat exchanger (2) is located on one side of the stripping tower (1). The fuel gas buffer tank (3) is located between the stripping tower (1) and the boiler (18). The steam inlet of the heat exchanger (2) is connected to a steam delivery pipe (6). The air inlet of the heat exchanger (2) is connected to an air inlet pipe (4). The air outlet is connected to the lower side of the stripping tower (1) through an air outlet pipe (5). A packing layer (10) is located in the middle of the stripping tower (1). A first wire mesh demister (11) is located at the top of the stripping tower (1). The packing layer (10) and the... A spray plate (8) is provided between the first wire mesh demisters (11). A feed pipe (9) is connected to one side of the spray plate (8). The top of the stripping tower (1) is connected to the lower side of the fuel gas buffer tank (3) through an exhaust pipe (12). A liquid removal component (13) is provided in the upper part of the fuel gas buffer tank (3). The top of the fuel gas buffer tank (3) is connected to the boiler (18) through a purified gas discharge pipe (14). The bottom of the fuel gas buffer tank (3) is connected to the other side of the spray plate (8) through a return liquid pipe (15). The other side of the bottom of the stripping tower (1) is connected to the boiler (18) through a purified liquid discharge pipe (16).

2. The fuel liquid removal device after stripping in a stripping tower according to claim 1, characterized in that, The bottom of the heat exchanger (2) is connected to the condensate discharge pipe (7).

3. The fuel liquid removal device after stripping in a stripping tower according to claim 1, characterized in that, The liquid removal component (13) is a second wire mesh demister (131).

4. The fuel liquid removal device after stripping in a stripping tower according to claim 1, characterized in that, The liquid removal component (13) is a baffle plate (132), and the baffle plate (132) is provided in a plurality of them and is staggered on both sides of the inner wall of the fuel gas buffer tank (3).

5. A fuel liquid removal device after stripping in a stripping tower according to claim 1, characterized in that, The purified gas discharge pipe (14) is equipped with a first control valve (141).

6. The fuel liquid removal device after stripping in a stripping tower according to claim 1, characterized in that, The purified liquid discharge pipe (16) is equipped with a delivery pump (17) and a second control valve (161).

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