CN2287992Y - Gas axial flow rotary packed bed gas-liquid heat and mass transfer device - Google Patents

Abstract

The utility model is a gas-liquid heat and mass transfer device for an axial-flow rotary packing bed, which consists of a casing, a rotating packing bed with two-way channels, a gas-liquid centrifugal separation layer, fan blades, radial liquid spray pipes, The liquid inlet pipe, the liquid collection tank, the motor and the liquid discharge pipe are composed together. The upper end of the rotating packed bed placed in the center of the casing is equipped with a gas-liquid centrifugal separation layer, and the fan blades are placed on the upper end of the gas-liquid centrifugal separation layer. The liquid spray pipe is located at the axis of the inner ring of the rotating packing bed, the liquid inlet pipe is fixedly installed in the upper part of the casing, and its outlet is aligned with the top opening of the liquid spray pipe, and the liquid collection tank is installed in the lower part of the casing and communicated with the discharge pipe. The motor is installed at the bottom of the casing. The device has high heat and mass transfer efficiency, less consumables, small volume, simple structure, and small operating air resistance.

Description

Gas axial flow rotary packed bed gas-liquid heat and mass transfer device

The utility model is a gas-liquid heat and mass transfer device for a gas axial flow rotary packing bed, which belongs to gas-liquid heat and mass transfer equipment. It particularly relates to a device that utilizes a rotating packed bed to generate centrifugal force to enhance gas-liquid two-phase heat and mass transfer.

At present, there are various structures of gas-liquid two-phase heat and mass transfer devices. The traditional devices are mainly fixed packing structures, such as drip and film cooling towers. In these cooling towers, a liquid film flows from top to bottom under the action of a gravitational field. However, due to the weak gravity field, the flow rate of the liquid film is very slow, the efficiency of gas-liquid heat and mass transfer is low, and the packing material consumption is large, the equipment volume is large, and the investment is large; in terms of the gas-liquid mass transfer device of the rotating packed bed, the current domestic and foreign The method of gas-liquid two-phase countercurrent motion mass transfer along the radial direction of the packed bed, such as the Chinese patent (application number: 95214611.8) named "Concentric Circular Thin Plate Filled Rotating Bed Gas-Liquid Mass Transfer Reactor", etc., although its liquid film The flow rate is very high and the mass transfer effect is good, but when dealing with large volumes of gas-liquid two-phase heat and mass transfer, such as cooling tower operation, the gas needs to overcome the large air resistance of the centrifugal force field and the interception of the inner and outer rings of the rotating packed bed. The large area disparity and the high gas velocity at the inner ring cause the problem of large air resistance, so this type of device is not suitable for large-volume gas-liquid heat and mass transfer operations such as cooling towers.

The purpose of this utility model is to solve and overcome the low liquid film flow rate, low gas-liquid heat and mass transfer efficiency, high packing material consumption, large equipment volume, large investment and existing problems in the existing gravity field gas-liquid heat and mass transfer. The high-gravity field rotating packed bed has the problems and shortcomings of large air resistance in the centrifugal force field, large disparity in the cross-sectional area of the inner and outer ring gas channels, high gas velocity in the inner ring, and large air resistance, which is not suitable for large-volume gas-liquid heat and mass transfer operations. Research Design a method that can greatly increase the liquid film flow rate, high gas-liquid heat and mass transfer efficiency, small investment, and avoid the air resistance of the centrifugal force field. A gas axial flow rotary packed bed gas-liquid heat and mass transfer device for liquid heat and mass transfer operation.

The utility model is realized through the following structural technical scheme: The structural diagram of the gas-liquid heat and mass transfer device of the gas axial-flow rotary packed bed is shown in Figure 1, and its key has an axial gas flow channel and a radial liquid flow channel. The rotary packing bed of the two-way flow channel of the flow channel is composed of a casing 1, a rotary packing bed 2, a gas-liquid centrifugal separation layer 3, a fan blade 4, a radial liquid spray pipe 5, a liquid inlet pipe 6, a liquid collection tank 7, The electric motor 8 and the liquid discharge pipe 9 are connected together, and their mutual position and connection relationship are as follows: the coaxial center line of the rotating packing bed 2 and the casing 1 is installed in the center of the casing 1, and the gas-liquid centrifugal separation layer 3 is placed on the rotating packing bed At the end, the fan blade 4 is placed on the upper end of the gas-liquid centrifugal separation layer, and the radial liquid spray pipe 5 is located at the inner ring axis of the rotating packing layer 2. The above-mentioned rotating packing bed 2, gas-liquid centrifugal separation layer 3, and fan blades 4 1. The radial liquid spray pipe 5 is coaxially connected with the same axis to form a rotating body and is located in the center of the casing 1. The liquid inlet pipe 6 is fixed on the inner upper part of the casing 1, and the outlet end of the liquid inlet pipe 6 is aligned with the radial spray liquid. The top end of the pipe 5 is open, the liquid collection tank 7 is installed in the lower part of the casing and communicates with the liquid discharge pipe 9, and the motor 8 is installed at the bottom of the casing; wherein, the above-mentioned gas-liquid centrifugal separation layer is a radial plate wing structure or Porous, granular packing structure, the gas flows in the axial direction, and the liquid is separated in the radial direction.

Compared with the prior art device, the utility model has the following advantages and beneficial effects: (1) Compared with the fixed fillers such as existing cooling towers, the utility model adopts the centrifugal force field to make the liquid film flow rate increase about ten times than that under the gravity field , can increase the gas-liquid two-phase heat and mass transfer coefficient by about an order of magnitude, can greatly reduce equipment volume and consumables, and reduce production costs; (2) Compared with the existing rotating packed bed, the airflow direction of the utility model has changed from existing Some of them are changed from radial direction to axial direction, which overcomes the disadvantage of large air resistance caused by factors such as centrifugal force and the large gap between the inner and outer ring cross-sectional areas of the packing bed, so that the utility model can be suitable for large-volume gas-liquid heat and mass transfer operations.

The accompanying drawings of the description are further explained as follows: Fig. 1 is a schematic structural diagram of the gas-liquid heat and mass transfer device of the gas axial flow rotating packed bed. In the figure: 1 is the casing, 2 is the rotating packing bed, 3 is the gas-liquid centrifugal separation layer, 4 is the fan blade, 5 is the radial liquid spray pipe, 6 is the liquid inlet pipe, 7 is the liquid collection tank, and 8 is the motor , 9 is a discharge pipe.

The implementation of the utility model is relatively simple. As shown in Figure 1, the general machining process is used to design the processing parts. We recommend that the design parameters are: the inner and outer ring diameters of the rotating packing bed can be φ70mm and φ300mm respectively, and the height can be The flow channel of the rotating packed bed is 200mm-300mm. The flow channel of the rotating packed bed is a stencil-shaped or porous medium and a granular structure. After the components are processed and manufactured, they can be installed and connected according to the interconnection relationship described in the above manual, and then it can be implemented better. This utility model. After the production and installation are completed, a dynamic balance test is required to prevent excessive vibration during high-speed rotation. The utility model designed and manufactured by the above-mentioned parameters recommended by us can handle the cooling of 2 to 5 tons of water under the general rotating speed. The operating principle of the utility model is: the liquid is injected into the radial liquid spray pipe 5 from the liquid inlet pipe 6, and enters the inner ring of the rotating packing bed 2 radially under the action of centrifugal force, and flows radially from the inner ring to the outer ring , transfer and exchange heat and mass with the axially flowing airflow, then discharge radially from the outer ring, flow down along the casing wall surface into the liquid collection tank 7, and then discharge from the liquid discharge pipe 9, and the gas enters from the inlet at the lower part of the casing The nozzle is pumped into the interior, and then flows upwards through the rotating packed bed in the axial direction. After heat and mass transfer with the liquid, the liquid mist is separated by the gas-liquid centrifugal separation layer 3, and then is pumped out of the casing by the fan blade 4.

Claims (1)

1, a kind of gas axial flow type rotating packed bed gas-liquid heat and mass transfer device, it is characterized in that: the key has the rotating packed bed of the two-way flow channel of axial gas flow channel and radial liquid flow channel, and it consists of casing ( 1), rotating packing bed (2), gas-liquid centrifugal separation layer (3), fan blade (4), radial liquid spray pipe (5), liquid inlet pipe (6), liquid collection tank (7), motor ( 8) The discharge pipe (9) is connected together, and its mutual position and connection relationship are as follows: the rotating packing bed (2) and the casing (1) are vertically installed on the center line of the casing (1), and the gas-liquid The centrifugal separation layer (3) is placed on the upper end of the rotating packing bed, the fan blade (4) is placed on the upper end of the gas-liquid centrifugal separation layer, and the radial liquid spray pipe (5) is located at the inner ring axis of the rotating packing bed (2) The above-mentioned rotating packing bed (2), gas-liquid centrifugal separation layer (3), fan blades (4), and radial liquid spraying (5) are coaxially connected through the same axis to form a rotating body and located in the center of the casing (1), The liquid inlet pipe (6) is fixed on the inner upper part of the casing (1), the outlet end of the liquid inlet pipe (6) is aligned with the top opening of the radial spray pipe (5), and the liquid collection tank (7) is installed on the casing The lower part is connected with the drain pipe (9), and the motor (8) is installed at the bottom of the casing.