Gas-liquid separation tower applied to VOCs treatment field

Abstract

The utility model relates to a gas-liquid separation tower applied to the field of VOCs (volatile organic compounds) treatment, which comprises a tower body, a waste gas outlet is arranged at the top of the tower body, and a liquid outlet connected with a liquid outlet pipe is arranged on the side wall of one side of the bottom of the tower body, and is characterized in that a waste gas inlet is arranged on the side wall of the lower end of the tower body; the waste gas inlet is communicated with a gas distributor arranged in the lower end of the tower body, a cooling coil pipe is further supported and fixed in the lower end of the tower body, a cooling water inlet and a cooling water outlet of the cooling coil pipe respectively extend out of the tower body, and an efficient coalescence module and a proton membrane module are further arranged in the upper end of the tower body. And the proton membrane module is positioned right above the efficient coalescence module. The gas subjected to gas-liquid separation enters a proton membrane separation unit for deep water-vapor separation; the gas treated by multiple units can achieve the effect of deep treatment, and a good working condition is provided for the next working procedure.

Description

Technical Field

[0001] This utility model relates to the field of VOCs treatment technology, specifically to a gas-liquid separation tower used in the field of VOCs treatment. Background Technology

[0002] In the past, insufficient attention was paid to the treatment of refinery maintenance exhaust gases, resulting in large amounts of harmful gases being directly emitted into the atmosphere and causing serious environmental pollution. With increasingly stringent environmental regulations and rising public demands for environmental quality, the treatment of refinery maintenance exhaust gases has become a crucial task for refineries.

[0003] Refineries produce a wide variety of VOCs with complex compositions, and maintenance exhaust gases are often high in temperature and moisture. Without pretreatment, these conditions can severely impact VOCs treatment equipment.

[0004] In actual production processes, gas-liquid separation equipment typically utilizes gravity settling or simple heat exchange to condense water vapor in the gas, thus achieving water-vapor separation. However, the treatment effect of these technologies is not ideal and cannot provide favorable operating conditions for subsequent processing steps.

[0005] Some components in VOCs produced by refineries have high melting and boiling points, making them prone to aggregation. Therefore, gas-liquid separation equipment needs to be cleaned periodically.

[0006] Wastewater from cleaning and condensed water are collected and deposited at the bottom of the equipment. Conventional equipment requires manual, periodic drainage, which increases operating costs. Summary of the Invention

[0007] This invention provides a high-efficiency gas-liquid separation tower for the treatment of VOCs generated in petroleum and petrochemical refineries, which solves the problems of high temperature and high moisture content in VOCs gas and provides good operating conditions for subsequent treatment processes.

[0008] To address the aforementioned technical problems, this utility model provides a gas-liquid separation tower for VOCs treatment, comprising a tower body, a waste gas outlet at the top of the tower body, and a liquid outlet connected to a liquid outlet pipe on one side wall at the bottom of the tower body. The tower body is characterized by a waste gas inlet on the lower side wall, which is connected to a gas distributor located within the lower part of the tower body. A cooling coil is also supported and fixed within the lower part of the tower body, with its cooling water inlet and outlet extending outside the tower body. Furthermore, a high-efficiency coalescing module and a proton exchange membrane module are located within the upper part of the tower body, with the proton exchange membrane module positioned directly above the high-efficiency coalescing module.

[0009] Furthermore, a remote level gauge is installed on the lower side wall of the tower body, and an automatic switching valve is installed on the outlet pipe.

[0010] Furthermore, a secondary spray pipe and a primary spray pipe are respectively installed in the tower body above and below the high-efficiency coalescing module. The air pressure above and below the high-efficiency coalescing module is monitored and detected by a differential pressure switch installed on one side of the tower body.

[0011] Furthermore, the bottom of the secondary spray pipe and the top of the primary spray pipe are each provided with several spray nozzles, and the spray nozzles on the secondary and primary spray pipes are respectively facing the upper and lower end faces of the high-efficiency coalescing module.

[0012] The beneficial effects of this utility model after adopting the above structure are as follows:

[0013] 1. This utility model incorporates a gas distributor within the tower body, which is connected to the exhaust gas inlet. The gas distributor's structural design ensures that the gas volume in each branch pipe is as uniform as possible, thereby enabling the exhaust gas to be evenly distributed within the tower and improving the exhaust gas treatment efficiency.

[0014] 2. This utility model can monitor the height of condensate in the tower in real time through the remote liquid level gauge. When the height of condensate exceeds the set value, the condensate in the tower can be discharged in time through the outlet pipe in conjunction with the automatic switching valve, eliminating the need for manual periodic discharge and reducing costs.

[0015] 3. This utility model has spray pipes on both the upper and lower sides of the high-efficiency coalescing module. This design allows for automatic cleaning of the tower body from time to time, and the differential pressure switch can effectively prevent blockage. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 This is a schematic diagram of the internal structure of this utility model.

[0018] Figure 2 This is a diagram showing the connection structure between the gas distributor and the exhaust gas inlet.

[0019] In the diagram: 1 is the tower body, 2 is the exhaust gas inlet, 3 is the cooling water inlet, 4 is the cooling water outlet, 5 is the primary spray pipe, 6 is the high-efficiency coalescing module, 7 is the secondary spray pipe, 8 is the remote level gauge, 9 is the automatic switching valve, 10 is the proton exchange membrane module, 11 is the differential pressure switch, and 12 is the exhaust gas outlet. Detailed Implementation

[0020] like Figure 1 and Figure 2The illustrated gas-liquid separation tower for VOCs treatment includes a tower body 1. A waste gas outlet 12 is located at the top of the tower body, and a liquid outlet connected to a liquid outlet pipe is located on one side wall at the bottom of the tower body. A waste gas inlet 2 is located on the lower side wall of the tower body, and the waste gas inlet is connected to a gas distributor located inside the lower end of the tower body. A cooling coil is also supported and fixed inside the lower end of the tower body, with a cooling water inlet 3 and a cooling water outlet 4 extending outside the tower body. A high-efficiency coalescing module 6 and a proton exchange membrane module 10 are also located inside the upper end of the tower body, with the proton exchange membrane module 10 positioned directly above the high-efficiency coalescing module 6. The proton exchange membrane unit uses polyimide, which has excellent mechanical properties, heat resistance, and corrosion resistance, as its framework. A fluoroalkylsilane ultraporous solution is used for surface coating to form a permeable membrane with oleophilic and hydrophobic properties. The high-efficiency coalescing unit has strong corrosion resistance and uses a combination of titanium and stainless steel, which can increase the lifespan of the high-efficiency coalescing unit. The exhaust gas inlet is located at the bottom of the tower, and a gas distributor is installed inside the tower to ensure uniform distribution of the exhaust gas. A cooling coil is installed above the gas distributor; as the gas passes through the coil, the gaseous water is cooled and condenses, removing most of the moisture from the gas. The exhaust gas then passes through a high-efficiency coalescing unit, where a large amount of moisture condenses on the coalescing material, eventually forming small droplets that fall back to the bottom of the tower under gravity. When the gas passes through the proton exchange membrane unit, most of the water vapor is blocked by the proton exchange membrane, which has oleophilic and hydrophobic properties, achieving a VOCs gas component throughput of 98% and a water vapor throughput of less than 5%. This invention incorporates a gas distributor inside the tower, connected to the exhaust gas inlet. The gas distributor's structural design ensures that the gas flow rate in each branch pipe is as uniform as possible, thus achieving uniform distribution of the exhaust gas within the tower and improving its treatment efficiency.

[0021] like Figure 1 A remote level gauge 8 is installed on the lower side wall of the tower shown, and an automatic switching valve 9 is installed on the outlet pipe. The condensate and small droplets formed by efficient coalescence in the tower collect at the bottom of the tower and are monitored by the remote level gauge at the bottom of the tower. When the liquid level exceeds the set value, the automatic switching valve at the bottom of the tower automatically opens to drain the liquid.

[0022] like Figure 1The high-efficiency coalescing module is equipped with a secondary spray pipe 7 and a primary spray pipe 5 inside the tower body above and below it, respectively. The air pressure above and below the high-efficiency coalescing module is monitored and detected by a differential pressure switch 11 located on one side of the tower body. Several spray nozzles are provided at the bottom of the secondary spray pipe and the top of the primary spray pipe, with the nozzles on the secondary and primary spray pipes facing the upper and lower end faces of the high-efficiency coalescing module, respectively. The coverage area of ​​the primary and secondary spray pipes is 300% of the diameter area inside the tower, which can thoroughly clean the high-efficiency coalescing unit and avoid dead zones. High-melting-point and high-boiling-point components in VOCs will condense in the high-efficiency coalescing unit, which can block the gas phase channels of the unit over time. The cleaning time is determined by monitoring the pressure difference between the upper and lower parts of the high-efficiency coalescing unit. When the pressure difference exceeds a set value, the primary and secondary spray pipes will automatically activate to clean the unit.

[0023] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should be considered within its protection scope.

Claims

1. A gas-liquid separation tower for VOCs treatment, comprising a tower body (1), wherein a waste gas outlet (12) is provided at the top of the tower body, and a liquid outlet connected to a liquid outlet pipe is provided on one side wall at the bottom of the tower body, characterized in that: An exhaust gas inlet (2) is provided on the side wall at the lower end of the tower body. The exhaust gas inlet is connected to a gas distributor located inside the lower end of the tower body. A cooling coil is also supported and fixed inside the lower end of the tower body. The cooling water inlet (3) and cooling water outlet (4) of the cooling coil extend to the outside of the tower body, respectively. A high-efficiency coalescing module (6) and a proton exchange membrane module (10) are also provided inside the upper end of the tower body. The proton exchange membrane module (10) is located directly above the high-efficiency coalescing module (6).

2. The gas-liquid separation tower for VOCs treatment according to claim 1, characterized in that: A remote level gauge (8) is installed on the lower side wall of the tower body, and an automatic switching valve (9) is installed on the outlet pipe.

3. A gas-liquid separation tower for VOCs treatment according to claim 1, characterized in that: The high-efficiency coalescing module is equipped with a secondary spray pipe (7) and a primary spray pipe (5) in the tower body above and below it, respectively. The air pressure above and below the high-efficiency coalescing module is monitored and detected by a differential pressure switch (11) set on one side of the tower body.

4. A gas-liquid separation tower for VOCs treatment according to claim 3, characterized in that: The bottom of the secondary spray pipe and the top of the primary spray pipe are each provided with several spray nozzles, and the spray nozzles on the secondary and primary spray pipes are respectively facing the upper and lower end faces of the high-efficiency coalescing module.

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