JPH09141041A - Gas-liquid mixer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the reaction efficiency and to enhance the removing efficiency of harmful materials by thoroughly performing gas-liquid contact in the whole area in a cylindrical body, prolonging residence time of flue gas, preventing the contact area of a liquid absorbent with the flue gas from decreasing to sufficiently provide gas-liquid contact of the flue gas containing harmful materials with the liquid absorbent in the form of mist. SOLUTION: In the upper part of the center inside a cylindrical body 2 installed in the vertical direction, a nozzle for spraying liquid in the form of mist is installed downward, and in the center inside the cylindrical body below the nozzle, a spiral auxiliary blade 4 is arranged in the vertical direction. Plural main blades 5 each consisting of a perforated plate are arranged, leaving a space in the circumferential direction around the spiral auxiliary blade 4 and inclined in the same direction as the circumferential one and a little inclined downward in the central direction inside and adhered closely with the inner wall surface of the cylindrical body 2. The plural main blades 5 arranged by leaving a space in the circumferential direction are arranged in plural stages zigzag around the spiral auxiliary blade 4 over the vertical range thereof, and also, the blades 5 in stages are provided so that their circumferentially inclined directions are alternately reversed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention utilizes a chemical reaction or the like by bringing a harmful component such as soot dust or sulfur dioxide or nitrogen oxide contained in flue gas into contact with an atomized absorbing liquid in a gas-liquid mixture. In particular, it relates to the technology for removing the harmful components, and in particular, the gas-liquid mixture that enhances the reaction efficiency by increasing the reaction efficiency of the exhaust gas containing the harmful components and the mist-like absorbing liquid in a gas-liquid mixing contact. It is related to vessels.

[0002]

2. Description of the Related Art Conventionally, as a means for removing harmful components such as soot dust, sulfur dioxide, and nitrogen oxides contained in flue gas, the harmful components are installed in the middle of an exhaust duct to remove the harmful components from a mist-like absorbing liquid and vapor. There is known a gas-liquid mixer which is brought into contact with a liquid mixture and removed by utilizing its chemical reaction or the like.

In a conventional gas-liquid mixer, a spiral blade is provided inside a cylindrical mixer, and a nozzle for spraying the absorbing liquid in a mist state is provided inside, so that the spiral blade is used. Then, the flue gas containing the harmful components and the mist-like absorbing liquid are swirled, and during the swirling, the smoke-exhaust liquid and the absorbing liquid are brought into contact with each other in a gas-liquid mixture, and the harmful components in the flue gas are removed by the chemical reaction. It has a structure to be removed.

[0004]

However, in the conventional gas-liquid mixer, the flue gas containing harmful components is swirling along the spiral blade while flowing down, and the flue gas is swirled by the centrifugal force. The flue gas is dispersed by the centrifugal force on the inner wall surface side in the cylindrical mixer, and the flue gas and the mist-like absorbing liquid come into contact with each other in the central part of the mixer. However, there is a drawback that the gas-liquid mixing contact efficiency is lowered.

Further, the flue gas dispersed on the inner wall surface side in the cylindrical mixer due to the action of centrifugal force flows down along the spiral blades, and does not stay in the mixer for a long time to the outside. Since it was discharged, the contact time with the absorbing liquid could not be extended and the gas-liquid mixing contact efficiency could not be increased.

Further, the mist-like absorbing liquid sprayed from the nozzle is successively accumulated while flowing down along the spiral blades to form water droplets, and the contact surface area with the smoke is reduced. There is a drawback that the reaction efficiency is lowered.

Furthermore, since the conventional gas-liquid mixer has a poor reaction efficiency between the smoke and the absorbing liquid and a low removal efficiency for the above-mentioned reason, the gas-liquid mixer has a large size in order to increase its efficiency. There was also a drawback that

The present invention has been made in view of the above problems and was devised to solve the problems. The purpose of the present invention is to achieve uniform gas-liquid mixing contact throughout the entire cylinder. Moreover, the retention time of flue gas is lengthened, and further, the contact surface area of the absorbing liquid with the flue gas is prevented from decreasing, and the flue gas containing harmful components and the gas-liquid mixture contact with the mist-like absorbing liquid. The present invention aims to provide a gas-liquid mixer capable of sufficiently enhancing the reaction efficiency and enhancing the efficiency of removing harmful components.

[0009]

In order to achieve the above object, the present invention forms a gas inlet at the upper end of a vertically installed cylinder and a gas discharge port at the lower end of the cylinder. Then, a nozzle for spraying the liquid in a mist state is provided downward on the upper part of the inner center of the cylindrical body, and a spiral auxiliary wing is vertically arranged at the inner center of the cylindrical cylindrical body below the nozzle. Inside the cylindrical tubular body by inclining a plurality of main blades made of perforated plates in the same direction with respect to the circumferential direction and slightly inclining downward toward the inner center A plurality of main wings, which are arranged in close contact with the wall surface and are arranged at intervals in the circumferential direction, are arranged in a zigzag pattern in the vertical direction around the upper and lower ranges of the above spiral auxiliary wings, and each of the upper and lower It consists of a means in which the inclination direction of the main wing in the circumferential direction is alternately reversed at each stage. .

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described more specifically based on embodiments of the invention shown in the drawings. Here, FIG. 1 is a perspective view of an essential part of the gas-liquid mixer, FIG. 2 is a plan view of an essential part of the gas-liquid mixer, FIG. 3 is a side view of the essential part of the gas-liquid mixer, and FIG.
FIG. 4 is a layout view of a gas-liquid mixer.

In the figure, a gas-liquid mixer 1 causes harmful components such as soot dust or sulfur dioxide and nitrogen oxides contained in flue gas to come into gas-liquid mixing contact with a mist-like absorbing liquid to cause chemical reaction or the like. It is a device to be awakened and is provided in the middle of an exhaust duct b leading to the chimney a. The flue gas which is detoxified by removing harmful components by the gas-liquid mixer 1 is released from the chimney a into the atmosphere.

The gas-liquid mixer 1 is installed vertically in the middle of the exhaust duct b. The gas-liquid mixer 1 is installed in the vertical direction and has a hollow inside body 2 and inside the cylinder 2. The nozzle 3 is provided to spray the absorbing liquid in a mist state, the auxiliary wing 4 spirally arranged in the center of the inside, the main wing 5 arranged in multiple stages around the auxiliary wing 4, and the like.

The cylinder body 2 of the gas-liquid mixer 1 is installed vertically in the middle of the exhaust duct b, and at least the intermediate portion in which the auxiliary blade 4 and the main blade 5 are arranged is a cylindrical body. The upper and lower end sides other than the intermediate portion may have a cylindrical shape or a rectangular shape.

A gas inlet 2a into which flue gas as a gas containing a harmful component flows is formed at the upper end of the cylindrical body 2, and a lower part of the cylindrical body 2 serves as a gas from which the harmful component is removed. A gas discharge port 2b for discharging smoke is formed.
The gas inlet 2a and the gas outlet 2b are connected in the middle of the exhaust duct b.

A nozzle 3 for spraying a liquid absorbing liquid in a mist state is provided downward at the upper part of the center of the inside of the cylindrical body 2.
That is, the nozzle 3 extends from the upper side surface of the tubular body 2 to the center of the inside, and the tip side thereof is bent downward. Nozzle 3
The absorbing liquid sprayed in a mist form is adjusted so as to be uniformly sprayed over the entire area inside the cylindrical body 2.

The base end side of the nozzle 3 is connected to a tank (not shown) for storing the absorbing liquid, and the necessary absorbing liquid is pressure-fed and supplied to the nozzle 3 side by a pressure feeding means (not shown) such as a pump. It has a structure in which it is atomized into the inside of the cylindrical body 2 from the nozzle 3.

At the center of the inside of the cylindrical body 2 which is a cylindrical body below the nozzle 3, a sub-wing 4 is vertically arranged in a spiral shape. In the embodiment of the present invention, the mandrel 4a is provided at the center in the vertical direction, and the auxiliary wing 4 is spirally arranged around the mandrel 4a.

The conventional gas-liquid mixer of this type also has a spiral blade vertically arranged therein, but the spiral auxiliary blade 4 according to the present invention is different from the conventional spiral blade. Vice wing 4
The wings are short when viewed from above. On the other hand, in the conventional spiral blade, the tip end side extends to the inner peripheral wall surface of the cylindrical body and is formed to the entire area in the radial direction inside the cylindrical body. The protruding width of the spiral auxiliary wing 4 and the main wing 5 arranged around the auxiliary wing 4 in the radial direction of the cylindrical body 2 is, for example, about 1: 3.

The spiral auxiliary blade 4 has the same function as that of the conventional spiral blade, that is, the smoke exhausted into the cylindrical body 2 is swirled in the downward direction by utilizing the spiral shape, and is formed into a mist. It has a function of enhancing gas-liquid mixed contact with the absorbing liquid. The spiral of the auxiliary wing 4 is at least once, that is, 360 degrees or more. The spiral auxiliary blade 4 is formed by spirally connecting a plurality of blade pieces in this embodiment, but a continuous one may be used. Further, a perforated plate may be used for the auxiliary blade 4.

Around the spiral auxiliary blade 4, a plurality of main blades 5 are arranged in close contact with the inner peripheral wall surface of the cylindrical tubular body 2 at intervals in the circumferential direction of the cylindrical tubular body 2. Has been done. Each main wing 5 arranged around the spiral auxiliary wing 4 has a centrifugal force acting on the flue gas flowing down and swirling along the spiral auxiliary wing 4 to be dispersed around it. It has a function of making the flue gas dispersed around it into a turbulent state, and has a function of enhancing gas-liquid mixing contact inside the cylindrical body 2.

A perforated plate is used for each main wing 5, and a large number of small holes 5a are formed on the surface of the main wing 5.
The holes 5a have a function of hindering the flow of the mist-like absorbing liquid when the mist-like absorbing liquid flows down along the surface of the main wing 5 and preventing the mist-like absorbing liquid from accumulating into water droplets during the flowing down. The area of the holes 5a is preferably, for example, 40% to 60% of the surface area of the main wing 5.

A plurality of main wings 5 arranged at intervals in the circumferential direction of the cylindrical tubular body 2 are formed so as to be inclined in the same direction with respect to the circumferential direction of the cylindrical tubular body 2. ing.
That is, all of the plurality of main wings 5 in the same circumferential direction are, for example, clockwise and obliquely upward. This inclination is for causing a turbulent flow of smoke exhaust, and as will be described later, the upper and lower main wings 5 are arranged so that the upper and lower main wings 5 have different inclination directions.

Further, each main wing 5 which is inclined in the circumferential direction is formed to be slightly inclined downward toward the center of the inside of the cylindrical body 2. This is because the atomized absorption liquid dispersed on the inner peripheral wall surface side of the cylindrical body 2 is caused to flow down to the center side by the centrifugal force, and the mist absorption liquid is flowing down along the inner peripheral wall surface of the cylindrical body 2. This is to prevent accumulation and water droplets. The inclination angle of each main wing 5 is preferably about 20 degrees with respect to the horizontal.

A plurality of main blades 5 arranged at intervals in the circumferential direction of the cylindrical tubular body 2 are arranged in a plurality of stages in the vertical direction of the tubular body 2 over the vertical range of the spiral auxiliary blade 4. ing. In this embodiment, four stages are arranged in the vertical direction. Further, the lower main wing 5 is arranged below the spaced apart portion of each upper wing 5, and the main wing 5 is arranged alternately above and below the spaced portion, that is, each main wing 5 is They are arranged in a staggered pattern in the vertical direction.

The upper and lower main wings 5 are arranged so that the upper and lower main wings 5 are alternately inclined in the circumferential direction of the main wings 5. That is, for example, when the upper main wings 5 are inclined obliquely upward in the clockwise direction, the lower main wings 5 are
Is provided so as to be inclined obliquely upward in the counterclockwise direction. In this way, the upper and lower main wings 5 have different inclination directions, thereby having a function of making the flue gas turbulent.

Next, the operation based on the configuration of the embodiment of the present invention will be described below. The flue gas containing harmful components passes through the exhaust duct b and flows into the inside of the cylinder 2 from the gas inlet 2a at the upper end of the cylinder 2 of the gas-liquid mixer 1. Also,
At the same time, the absorbing liquid that removes harmful components contained in the flue gas by a chemical reaction or the like is atomized from a nozzle 3 provided downward in the center of the inside of the cylindrical body 2.

The flue gas containing harmful components that has flowed into the inside of the cylindrical body 2 flows down toward the lower gas discharge port 2b. The flue gas containing harmful components during the flow down flows down while swirling along the spiral auxiliary blade 4 arranged in the center of the inside of the middle part of the tubular body 2. The harmful components swirling during this flow down. A centrifugal force acts on the smoke exhaust containing the particles by the swirling, and the smoke is dispersed around the smoke exhaust.

Since a plurality of main wings 5 are arranged in the circumferential direction and in a plurality of stages in the vertical direction around the spiral sub-wing 4, the smoke exhaust containing harmful components dispersed around by the centrifugal force. Is disturbed by the surrounding main wings 5.

That is, since each of the main wings 5 arranged above and below is inclined in the circumferential direction, and the inclination direction is different between the upper and lower sides, the flue gas containing harmful components dispersed by the centrifugal force is not emitted. , The flow is different between the upper and lower sides and becomes a turbulent state, and the time of staying inside the cylindrical body 2 becomes long, and as a result, gas-liquid mixing with the absorbing liquid atomized from the nozzle 3 is performed. The contact time becomes longer, and the chemical reaction with the absorbing liquid sprayed in a mist form from the nozzle 3 is sufficiently performed, and the chemical reaction removes the harmful components contained in the flue gas. Its removal efficiency increases.

Then, while flowing down the main wing 5 and the auxiliary wing 4, the flue gas which has been made harmless by removing harmful components by a chemical reaction with the absorbing liquid sprayed in a mist form from the nozzle 3 is made into a cylindrical body. The gas is discharged from the gas discharge port 2b at the lower end of 2, flows through the exhaust duct b, and is discharged from the chimney a into the atmosphere. Further, the absorbing liquid from which harmful components have been removed from the flue gas by a chemical reaction or the like is also discharged from the lower end of the cylindrical body 2.

The present invention is not limited to the above embodiment of the present invention, and it is needless to say that various modifications can be made without departing from the spirit of the present invention. For example, in the embodiment of the invention described above, the main wing 5 is described as being arranged in four stages vertically, but may be arranged in two stages, three stages, or five stages or more.

[0032]

As is clear from the above description, according to the gas-liquid mixer of the present invention, the central portion and the inner peripheral wall surface of the inside of the tubular body contain the harmful components evenly. It is possible to achieve gas-liquid mixed contact between smoke exhaust and mist-like absorption liquid, and moreover, by the action of the main wing provided around the spiral auxiliary wing,
Since the residence time of the flue gas can be lengthened and the gas-liquid mixing contact time with the absorbing liquid can be lengthened, the gas-liquid mixing contact efficiency between the flue gas and the mist-like absorbing liquid can be increased. The efficiency of removing harmful components contained in the flue gas can be improved. Furthermore, the main wing made of a perforated plate can prevent the mist-like absorbing liquid from becoming water droplets as much as possible, and can prevent the contact surface area of the absorbing liquid with the flue gas from decreasing. It is possible to prevent a decrease in reaction efficiency with.
Further, as described above, the efficiency of removing harmful components contained in the flue gas can be increased, so that it is possible to reduce the size of the gas-liquid mixer. .

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a gas-liquid mixer showing an embodiment of the present invention.

FIG. 2 is a plan view of a main part of a gas-liquid mixer showing an embodiment of the present invention.

FIG. 3 is a side view of the essential parts of the gas-liquid mixer showing the embodiment of the present invention.

FIG. 4 is a layout view of a gas-liquid mixer showing an embodiment of the present invention.

[Explanation of symbols]

 1 Gas-Liquid Mixer 2 Cylindrical 2a Gas Inlet 2b Gas Outlet 3 Nozzle 4 Sub Wing 4a Mandrel 5 Main Wing 5a Hole a Chimney b Exhaust Duct

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location B01F 5/00 B01D 53/34 130Z B01J 10/00 103 (72) Inventor Riichi Ogura Kitamatsuura Nagasaki Prefecture 339-41 Kojima, Kosaishi-gun, Kosaishi-gun, Japan Within Japan Aquatech Co., Ltd. (72) Naoki Otonari, 339-41, Kojima, Kosaishi-cho, Kosasa-cho, Kitamatsuura-gun, Nagasaki Prefecture, Japan

Claims (1)

[Claims] 1. A gas inflow port is formed at an upper end of a vertically installed cylindrical body, a gas discharge port is formed at a lower end of the cylindrical body, and a liquid is atomized into an upper part of an inner center of the cylindrical body. The nozzle is provided downward, a spiral auxiliary blade is arranged vertically in the center of the inside of the cylindrical tubular body below the nozzle, and a perforated plate is provided at intervals in the circumferential direction around the spiral auxiliary blade. A plurality of main wings are tilted in the same direction with respect to the circumferential direction and slightly tilted downward in the inner central direction, and are arranged in close contact with the inner wall surface of the cylindrical tubular body, and are arranged at intervals in the circumferential direction. The plurality of main wings are arranged in a zigzag pattern in the vertical direction around the upper and lower ranges of the spiral auxiliary wings, and the inclination directions of the upper and lower main wings in the circumferential direction are alternately reversed in each step. A gas-liquid mixer characterized by being provided.