JPS6248525B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a gas-liquid contact device that can be applied to environmental sanitation and pollution prevention equipment and removes harmful components from gas. (Prior Art) Conventionally, various types of devices have been proposed for removing harmful components from gases using liquids, but in principle, the problem is how to effectively make gas-liquid contact. It is classified into various types depending on the type of gas-liquid contact. These include jet scrubbers and spray towers that form liquid into fine droplets and bring them into contact with gas, and plate towers such as bubble mirror and perforated plate types that allow gas to pass through the liquid as bubbles. The gas entrainment method utilizes the energy of the liquid to split the gas or form a gas-liquid mixed phase, the bubble column is equipped with a bubble generator using a diffuser, and the wet surface of the packed material comes into contact with the gas. Such as packed towers. The above-mentioned types are widely and commonly used, and their improvements include research on making droplets smaller, research on increasing contact time, making bubbles smaller, and simplifying bubble generation. Many inventions have been made through research into the shape of fillers and other developments aimed at saving energy and improving efficiency. Fundamentally, however, the various devices mentioned above require gas supply equipment and liquid supply equipment.
Naturally, each required energy for driving. Additionally, some types of equipment required excessive energy. Furthermore, liquid supply equipment requires ancillary equipment such as piping, valves, and instrumentation.
Equipment costs were not limited to just supply equipment. In addition, among the plate towers, gas entrainment systems, bubble towers, etc., those that are self-contained with gas have been put into practical use, but in order to improve efficiency with a single function, the equipment has a part that mixes gas and liquid. Various mechanisms were applied to it, making it complicated. (Problems to be solved by the invention) Based on the experience of manufacturing and selling various types of gas-liquid contact devices over many years, the present inventor has realized that it is not enough to create a single-function device, and that it is energy-saving, compact, and inexpensive. The present invention was achieved as a result of intensive research aimed at creating a highly efficient gas-liquid contact device. (Means for Solving the Problems) Therefore, the present invention provides a liquid suction and gas-liquid mixing system in which a gas supply pipe for supplying gas is installed in the tangential direction with respect to the cross section of the pipe, and a liquid suction port is provided at the bottom. A conical tube connected concentrically above the conical tube and having a reduced upper end diameter, a throat connected to the conical tube with the same diameter as the upper end diameter of the conical tube, and a conical tube connected above the throat and having an expanded upper end. An inverted conical tube, a covered cylinder arranged to cover the inverted conical tube, a filling layer interposed between the cylinder and the inverted conical tube, and a housing containing each of the above-mentioned members and forming a liquid reservoir in the lower part. The structure consists of the following. (Function) With the above configuration, a gas-liquid mixed-phase swirling flow of the liquid and gas sucked from the liquid suction port is formed in the liquid suction and gas-liquid mixing tube, and gas-liquid contact is performed as one stage. In addition, in the process of passing through the throat with a small cross-sectional area, the swirling flow is converted to an axial flow, and due to the increase in flow velocity, the gas at the center of the circle is also sucked in, creating a safe gas-liquid mixed phase state. As the gas-liquid contact area is formed and the flow rate decreases sequentially during the process of passing through the inverted conical tube, the gas-liquid multiphase fluid separates into fine droplets and gas.
The droplets are dispersed in the gas and suspended, and are discharged from the inverted conical tube together with the gas, and the flow direction changes from upward to downward, uniformly wetting the surface of the packing, and due to contact between the surface of the packing and the gas, Efficient gas-liquid contact is performed. (Example) Examples of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show examples of the present invention,
Reference numeral 1 denotes a liquid suction and gas-liquid mixing tube, and a gas supply tube 2 is connected to the mixing tube 1 for supplying gas in a tangential direction to the cross section of the tube. A conical tube 3 is connected to the upper end of the liquid suction and gas-liquid mixing tube 1, and the diameter of the upper end of the conical tube 3 is reduced, and a throat 4 having the same diameter as this reduced diameter is connected to the conical tube 3. has been done. Further, an inverted conical tube 5 whose upper end is expanded is connected to the throat 4, and a covered cylinder 6 is provided to cover the conical tube 5, and between the cylinder 6 and the inverted conical tube 5 there is a fiber material etc. A filling layer 7 consisting of the following is interposed. Each of these members is housed in an outer cylinder 9 having a liquid reservoir 8 and a lid plate connected thereto. Also, 10 in the figure
is a filling material, 11 is a gas inlet pipe, 12 is a gas outlet,
13 is a liquid inlet nozzle, 14 is a drain nozzle, 15
is a liquid suction port, and A is a liquid. Next, the operation of the embodiment configured as above will be explained.
Due to the pressure of the supply gas supplied through the liquid suction and gas-liquid mixing pipe 1, a gas-liquid mixed phase swirling flow of the liquid and gas sucked from the liquid suction port 15 is formed.
The first stage of gas-liquid contact is carried out. However, since there is a large difference in specific gravity between gas and liquid, the gas tends to gather in the center due to the centrifugal force generated by swirling. At this time, the swirling flow is converted to an axial flow, and the gas in the center is also sucked in due to the increase in flow velocity, resulting in a complete gas-liquid mixed phase state.
This part forms the second stage gas-liquid contact part. Next, the gas-liquid multiphase fluid that passed through the throat 4 is
As the flow rate decreases sequentially during the process of passing through the inverted conical tube 5, the gas-liquid multiphase fluid is separated into fine droplets and gas, and the droplets are dispersed and suspended in the gas, and pass through the inverted conical tube 5 together with the gas. is discharged outside. This portion of the inverted conical tube 5 forms the third stage gas-liquid contact portion between the droplet and the gas. Further, the gas and liquid droplets discharged from the inverted conical tube 5 hit the lid portion of the covered cylinder 6, and the flow direction becomes downward rather than upward. The droplets whose flow direction has changed downward uniformly wet the surface of the packing 7, and the fourth stage of gas-liquid contact is performed by contacting the surface of the packing 7 with the gas. In addition, for the purpose of replenishing moisture that evaporates into the gas, a spray device using the pressure of supply water for cleaning may be provided above the covered cylinder 6 and the filling material 10. Further, the gas-liquid ratio, which affects performance and efficiency, can be adjusted by adjusting the supply pressure of the supply gas. (Effects of the Invention) As explained in detail above, the present invention allows various types of gas-liquid contact to be performed from the first stage to the fourth stage, and moreover, applies the characteristics of each contact type within one device. As a result, highly efficient gas-liquid contact is performed in total, and harmful components in the gas can be removed. In addition, from the lower end of the gas supply pipe to the upper end of the throat, a continuous layer of gas-liquid multiphase fluid is formed, and due to the pressure difference caused by the difference in the apparent specific gravity of the gas-liquid multiphase and the specific gravity of the liquid, the liquid suction and gas-liquid mixing pipe Since the liquid is automatically sucked from the liquid suction port, there is no need for equipment to supply liquid to the liquid suction and gas-liquid mixing tube. Therefore, the pressure of the supplied gas is the sum of the pressure necessary to generate a swirling flow in the liquid suction/gas-liquid mixing pipe and the pressure to compensate for the pressure loss within the device, and is the sum of the pressure necessary to generate a swirling flow in the liquid suction and gas-liquid mixing pipe, and the pressure to compensate for pressure loss within the device. energy is not required, and overall energy savings can be achieved. In addition, the structure is simple and inexpensive, and it is highly efficient, requiring almost no repair costs. Next, Table 1 shows the results of tests conducted using the apparatus shown in FIG. 1 with the following specific dimensions. Liquid suction and gas-liquid mixing pipe 1: ID100mmφ Gas supply pipe 2: ID100mmφ Throat 4: ID40mmφ Inverted conical tube 5: 450mmH Covered cylinder 6: 300mmφ×600mmH Outer cylinder 9: 500mmφ×650mmH Liquid reservoir 8: 900mmφ×500mmH Filled layer 7 : For vinyl locks, equipment with a height of 400 mm or more, the supply gas amount is 2 m ³ /
min, feed gas pressure between 325 mm and 335 mm (water column). Note that the outlet concentration in Table 1 is a gas detection tube made by Komei Rikagaku Co., Ltd., the inlet concentration marked with * is a gas detection tube, and the other values are calculated from the gas loss in the cylinder and the air volume. From Table 1, it can be seen that the device of the present invention has excellent performance. 【table】

[Brief explanation of the drawing]

FIG. 1 is a front cross-sectional view of a gas-liquid contact device showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line X to X in FIG. Explanation of the main parts of the diagram, 1...liquid suction and gas-liquid mixing tube, 2...gas supply pipe, 3...conical tube, 4...throat, 5...inverted conical tube, 6...covered cylinder, 7
...Filled layer, 8...Liquid reservoir, 9...Outer cylinder (housing), A...Liquid.

Claims (1)

[Claims] 1 A gas supply pipe for supplying gas is installed in the tangential direction with respect to the cross section of the pipe, and a liquid suction and gas-liquid mixing pipe is provided with a liquid suction port at the bottom, and the pipe is connected concentrically to the upper end thereof,
A conical tube with a reduced upper end diameter, a throat having the same diameter as the upper end diameter of the conical tube and connected to the conical tube, an inverted conical tube connected to the throat and having an enlarged upper end, and a conical tube that covers the inverted conical tube. A gas-liquid contact characterized by comprising a covered cylinder disposed in the cylinder, a packed layer interposed between the cylinder and the inverted conical tube, and a housing enclosing each of the above-mentioned members and forming a liquid reservoir in the lower part. Device.