JPS599689Y2 - Vortex type gas absorption device - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a spiral gas absorption device.

In an inert gas explosion-proof system that supplies inert gas such as carbon dioxide to the gas phase of an oil tanker, the inert gas is supplied to a boiler installed in the engine room of an oil tanker. It is advantageous to desulfurize, remove dust, and cool the combustion gas discharged from the combustion chamber before using it.

By the way, the boiler combustion gas normally contains impurities such as sulfur oxides and dust, and in order to remove these impurities, a gas absorption device such as a scrubber is usually installed in the gas supply pipe system. is provided.

This gas absorption device consists of a venturi that accelerates and releases combustion gas, a spiral passage for the gas discharged from the venturi, and a gas-liquid separation chamber for the gas discharged from the spiral passage.
Spray nozzles are arranged in multiple stages in the combustion gas inlet, the gas passage of the lower compartment, the spiral passage, and the gas-liquid separation chamber, respectively, and the fine droplets sprayed from the spray nozzles are scattered in opposition to the gas flow. , impurities in the combustion gas can be removed by contact between the droplets and the gas.

However, as shown in FIG. 3, the droplets sprayed from the spray nozzle 02 in the spiral passage 01 of the gas absorption device are pushed back by the high-speed gas flow and become a flow parallel to the gas flow direction, so that the droplets spray downward from the spiral passage 01. The water level of this drain 03 becomes higher toward the peripheral end 04 of the spiral passage, that is, the center of the device, and the flow becomes unstable throughout the gas passage, resulting in a large pressure drop and the gas It also had the disadvantage of being limited in quantity.

This invention was made in order to solve the above-mentioned drawbacks. A drain pipe is provided in communication from the peripheral end of the spiral gas passage to a drain reservoir at the bottom of the lower compartment, and the processing liquid is stored in the spiral gas passage. The purpose of the present invention is to provide a spiral gas absorption device that can exhibit appropriate gas absorption efficiency, average the drain water level in the spiral gas passage, and increase the gas flow rate by discharging the gas.

Examples of this invention will be described below based on the drawings.

FIG. 1 is a vertical side view of the gas absorption device, and FIG. 2 is a view taken along the line A-A in FIG.
This is an outer cylinder of a gas absorption device that is divided into three chambers in the vertical direction, and a venturi 4 is provided concentrically with this outer cylinder 1.

The upper end of the venturi 4 protrudes above the outer cylinder top plate 1A, and a combustion gas inlet 5 is formed at the top, and a horizontal spray nozzle 6 is attached to the peripheral wall.

A liquid reservoir 8 is provided in the lower compartment 7 of the outer cylinder 1, and the liquid reservoir 8 is opposed to the gas discharge end 9 of the venturi 4.

The middle compartment 10 of the outer cylinder 1 is divided into upper and lower halves by an intermediate partition plate 11, and each compartment 12.13 is provided with a spiral strip plate 14.15 to form a spiral passage 16.17.
It takes shape.

Through holes 18A, 18B, 19 are formed along the outer peripheries of the lower partition plate 3 and the intermediate partition plate 11, and the spiral passages 16, 17 are formed by these through holes 18A, 18B, 19. The outermost passages 17B of the starting portions 16A and 17A are communicated with the lower compartment 7.

and the outermost passage 16B, 1 of said spiral passage 16.17.
A plurality of impingement type spray nozzles 20.21 are provided at appropriate intervals in 7B, and the impingement type spray nozzles 20.2
Impurities in the gas can be removed by contact between the fine droplets ejected from the gas and the gas.

Further, an opening 23 is formed at the lower end of the spiral passage 16, 17 which is divided into two halves, passing through the intermediate partition plate 11 and the lower partition plate 3, and reaching the drain reservoir 22 at the bottom of the lower compartment 7.
A plurality of drain pipes 24.25 having a
The drain water level in the spiral passages 16 and 17 can be always averaged by discharging the drain water to a certain level.

Furthermore, in order to regulate the flow path of gas discharged from the venturi 4 to the lower compartment 7 via the liquid reservoir 8, a semicircular partition plate 26 is provided on the outside of the liquid reservoir 8, and this partition plate 26 and the outer cylinder The gas passage 27 formed between the through holes 18A and 1
A plurality of horizontal spray nozzles 28 are provided at appropriate intervals in the circumferential direction of the gas passage 27, communicating with the spiral passages 16 and 17 via 8B and 19, respectively.

A gas-liquid separation chamber 30 is formed in the upper compartment 29 of the outer cylinder 1 so as to surround the venturi 4.

That is, the gas-liquid separation chamber 30 has a large number of slits 31 in the circumferential direction.
A cylindrical wall 32 is provided between the outer cylinder top plate 1A and the upper partition plate 2. It communicates with the spiral passage end portions 16C and 17C.

A plurality of downward spray nozzles 34 are provided on the upper outer cylinder top plate 1A of the gas-liquid separation chamber 30 at appropriate intervals in the circumferential direction.

The gas-liquid separation chamber 30 in the upper compartment 29 has an annular passage 35 on the outside, and a process gas discharge pipe 3 fixed to the outer cylinder 1.
6 are connected in series.

In order to discharge the processing liquid and the gas-liquid separated liquid spouted from the downward spray nozzle 34 in the gas-liquid separation chamber 30 in the upper compartment 29, the upper compartment 29 is disposed on the side of the outer cylinder 1.
A drain discharge pipe 37 is connected from the drain pipe 37 to the bottom of the lower compartment 7.

Note that a processing liquid discharge pipe 38 is provided at the bottom of the lower compartment 7 to discharge the processing liquid to the outside of the apparatus.

This invention has the above-mentioned structure, and while the combustion gas passes through the venturi 4 installed in the center of the outer cylinder 1 of the gas absorption device, a horizontal spray nozzle 6 installed at the gas inlet 5 is used.
After coming into contact with the droplets sprayed from the liquid droplets and removing dust, a high-speed gas flow is formed, and this high-speed gas flow is introduced from the liquid reservoir 8 in the lower compartment 7 into the gas passage 27 along the partition plate 26,
Dust is further removed by droplets ejected from a plurality of horizontal spray nozzles 28 disposed in opposition to the gas flow in the middle compartment 10, and then the gas flows at high speed into the spiral passage 16 divided into upper and lower halves of the middle compartment 10. .17 and is absorbed by contact with fine droplets sprayed from an impingement type spray nozzle 20.21 provided in this passage.

Moreover, these fine droplets are carried along with the gas into the spiral passage 16.
17, and the centrifugal force of the gas energy causes the spiral passage 16. 17 walls, i.e. spiral strips 14.1
A thin liquid film is formed on the surface of 5.

Therefore, unreacted sulfur dioxide gas in the gas comes into contact with this liquid film and is absorbed.

The starting part 16A of the spiral passage also absorbs the sulfur dioxide gas.
, 17A to the terminal parts 16C, 17C, and the remaining drain liquid falls and remains at the bottom of each of the terminal parts 16C and 17C. The drain pipes 24 and 25 are piped through the partition plate 3 to the drain reservoir 22 at the bottom of the lower compartment 7, and are discharged from the opening 23 at the lower end to the drain reservoir 22. Since the structure is such that the liquid can be appropriately discharged to a processing tank (not shown) etc. via the processing discharge pipe 38, the drain water level staying in the spiral passage is always averaged, and an appropriate gas absorption efficiency is achieved. At the same time, the gas flow rate can be increased.

Furthermore, the gas that has passed through the spiral passages 16 and 17 flows from the center through the through hole 33 into the gas-liquid separation chamber 30, and flows into the gas-liquid separation chamber 30 through a plurality of downward spray nozzles 34 attached to the outer cylinder top plate 1A.
The remaining sulfur dioxide gas will be completely absorbed when it comes into contact with the droplets ejected from the tank again.

Since the gas flowing into the gas-liquid separation chamber 30 is a swirling flow, it flows into the gas-liquid separation chamber 30 in a tangential direction, and after flowing in, is discharged from the slit 31 in the tangential direction.

At this time, the gas is separated into gas and liquid, and the liquid-separated gas is discharged from the processing gas discharge pipe 36 to the outside of the apparatus through the annular passage 35 at a low speed.

The drain liquid remaining at the bottom of the upper compartment 29 is discharged from the lower part of the annular passage 35 through the drain discharge pipe 37 to the bottom drain reservoir 22 of the lower compartment 7, if necessary.

As explained above, according to the spiral gas absorption device of the present invention, a drain pipe is provided, one end of which opens in the lower compartment and the other end opens at the bottom of the inner peripheral end of the spiral passage in the middle compartment.
The drain liquid that comes into contact with the droplets sprayed from the spray nozzle placed in the spiral passage, absorbs sulfur dioxide gas from the combustion gas, and stays at the bottom of the spiral passage is immediately drained from the inner end of the spiral passage. The drain water level does not flow down to the lower compartment via the pipe and stay in the spiral passage, and the level of drain water that stays in the flat spiral passage can be constantly averaged, and the flow rate of gas passing therethrough can be increased.

Furthermore, according to the present invention, since the spiral passage and the lower compartment are connected through the drain pipe, especially when a plurality of middle compartments are connected in series and interposed between the lower compartment and the upper compartment,
Drain water from each middle compartment can be made to flow directly to the lower compartment without going through the other middle compartments, and an improvement in gas absorption efficiency can be expected.

[Brief explanation of the drawing]

Fig. 1 is a vertical side view of a gas absorption device showing an embodiment of this invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig.
The figure is a developed view illustrating a state in which drain is retained in a conventional spiral passage. 1...Outer cylinder, 3...Lower partition plate, 4.
...Venturi, 5...Combustion gas inlet, 7...Lower compartment, 9...Gas discharge end of venturi, 10...・Middle compartment, 11
...Intermediate partition plate, 16.17 ... Spiral passage, 22 ... Drain reservoir, 24.25 ...
...Drain pipe, 29...Upper compartment, 30
...... Gas-liquid separation chamber, 36... Processing gas discharge pipe, 37... Drain discharge pipe.

Claims (1)

[Scope of utility model registration request] A venturi accelerates the combustion gas and releases it into the lower compartment, and a plane spiral passage located above the lower compartment runs from the outer periphery to the center of the inner periphery, and combustion from the venturi passes through the lower compartment. There is a middle compartment where gas flows in from the outer periphery of the spiral passage and is discharged upward from the center of the inner periphery; An upper compartment for discharging the treated gas is provided, and spray nozzles are arranged in multiple stages, and fine droplets sprayed from the spray nozzles are scattered in opposition to the gas flow, and the droplets come into contact with the gas. The spiral gas is configured to remove impurities in the combustion gas by a drain pipe, and is provided with a drain pipe whose one end opens in the lower compartment and the other end opens at the bottom of the inner circumferential end of the middle compartment spiral passage. Absorption device.