JP2005066572A - Three fluids nozzle and garbage disposal apparatus equipped with the nozzle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nozzle for mixing and spraying without clogging three kinds of fluids consisting of two kinds of liquids and a gas which generate a solid when mixed. <P>SOLUTION: The nozzle 10 is used for mixing and spraying the three kinds of fluids consisting of a gas A, a first liquid N and a second liquid W, while the liquid N and W generate the solid when mixed. The nozzle 10 is provided with three passages R1, R2, R3 to which the first liquid N, the second liquid W and the gas A are supplied through separate piping, and is also provided with a section for mixing the gas A and the second liquid W, a first nozzle hole 21 for spraying the first liquid, and a second nozzle hole 22 for spraying the mixed fluid consisting of the second liquid W and the gas A. The first liquid N and the second liquid W are not mixed until the liquids reach the nozzle holes 21, 22 and the fluids sprayed from the first nozzle hole 21 and the second nozzle hole 22 are mixed externally to generate spray. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a three-fluid nozzle that mixes and sprays three fluids, gas and two types of liquid, and a waste treatment apparatus including the three-fluid nozzle, and is preferably used as a nozzle for exhaust gas cooling in a gas cooling tower of the waste treatment apparatus. It is used.
Specifically, in the exhaust gas cooling nozzle that mixes and sprays three fluids of a basic neutralized aqueous solution, its diluted solution, and air to remove acidic components contained in the exhaust gas, in particular, the waste water from the plant facility is used as the diluted solution. When it is used in a circulating manner, it prevents the nozzles from being clogged with wastewater inclusions.

In a refuse incinerator and a melting furnace for incineration ash generated in the incinerator and incineration fly ash, acidic gas components (HCl, SOx) are contained in the high-temperature gas generated during incineration and melting. It is necessary to evacuate after removing the components.
As a method for removing the acid gas component, there are a wet method, a dry method, and a semi-wet method. In the wet method, exhaust gas is passed through a basic aqueous solution storage tank to absorb and neutralize acidic components.
In the dry method, basic powder is sprayed to adsorb acid gas components to the powder, and then exhaust gas is exhausted through a dust collector such as a bag filter.
The semi-wet method is a method in which a basic aqueous solution is diluted with water and sprayed onto the exhaust gas as a gas cooling spray from a nozzle. During the evaporation process, exhaust gas cooling and absorption / neutralization of acidic components in the exhaust gas are performed simultaneously. is there.

  The above wet method generates waste water. In a waste incineration / dissolution plant, a closed system is assumed for water, and there is a case where waste water is not generated. Therefore, a wet method that generates waste water cannot be adopted in many cases. In addition, since the dry method directly reacts by contacting the basic powder and the exhaust gas, the reaction efficiency becomes low, and when the concentration of acidic gas contained in the exhaust gas becomes high, it is difficult to remove acidic components below the emission standard. It becomes.

On the other hand, the semi-wet method has the advantages that it can solve the problems of the wet method and the dry method and can absorb and neutralize the acidic component simultaneously with cooling of the exhaust gas.
Therefore, the above semi-wet method in which a nozzle for spraying an aqueous solution of a basic neutralizing agent such as a caustic soda solution on the exhaust gas is suitably used in a gas cooling tower for introducing the exhaust gas from the incinerator and the melting furnace. At that time, for neutralizing acidic components, if the basic neutralizing agent such as caustic soda has the same number of moles, the reaction efficiency becomes better when the concentration is lower and the amount of the aqueous solution is larger. It is preferable to dilute with a lower concentration.
In addition, in the semi-wet method, the smaller the particle size of the basic aqueous solution to be sprayed, the more the contact part with the exhaust gas can be increased and the function of removing acidic components can be enhanced, and spraying prevents wetting in the gas cooling tower. It is necessary to atomize the spray from the point that the cooling efficiency of exhaust gas is increased and the running cost is not increased.

  In order to atomize the spray, a two-fluid nozzle that mixes air with the liquid disclosed in Japanese Patent Application Laid-Open No. 2002-159889 (Patent Document 1), atomizes the liquid, and sprays the gas-liquid mixed mist is exhaust gas. It is suitably used as a cooling nozzle.

JP 2002-159889 A

  On the other hand, when water cannot be discharged as a closed system in a waste incineration / melting plant, wastewater for water cooling of ash bits and slag cannot be discharged outside the plant in the waste incinerator and melting furnace. When this waste water is used as a diluting solution of the basic aqueous solution supplied to the gas cooling nozzle, it can be evaporated and discharged from the chimney by spraying the waste water, so that the gas cooling tower can also be used as a waste water treatment device.

However, when the above wastewater is used as a dilute solution for basic aqueous caustic soda such as aqueous caustic soda, calcium is dissolved in the wastewater, and when this calcium is mixed with caustic soda, calcium hydrate (scale) is generated in the piping. There is a problem that is easy to do. In addition, there is a problem in that the viscosity is increased and foreign substances contained in the drainage are easily manifested.
Therefore, when the mixed liquid using the waste water as the diluted water of the caustic soda is used for the two-fluid nozzle of the patent document, clogging due to the scale and foreign matters is likely to occur particularly in the gas-liquid mixing portion. According to the experiments by the present inventors, when the calcium ion concentration in the waste water exceeds 100 mg / l, spraying cannot be performed in a few hours. When clogging occurs, the aqueous solution of caustic soda is sprayed without being sufficiently atomized, so the evaporation of the wastewater does not complete and the bag filter installed downstream of the cooling tower remains in a liquid state, causing clogging in the bag filter. Let When this clogging state progresses, the exhaust gas cannot be sucked and the plant cannot be operated. In addition, it causes a so-called dust trouble that causes dust to deposit in the cooling tower or in the flue, which impedes the operation of the plant.
To prevent this, maintenance of the two-fluid nozzle needs to be performed frequently. However, since the maintenance work is a dangerous work for handling powerful drugs, the nozzle is not clogged from the viewpoint of safety. There is a need.

  In order to prevent nozzle clogging caused by flowing a mixed fluid of waste water and basic neutralizer aqueous solution (caustic soda aqueous solution, etc.) inside the nozzle, waste water and caustic soda aqueous solution are sprayed on exhaust gas from separate nozzles. Although there is a method, the concentration of caustic soda is increased because the aqueous caustic soda solution is not diluted with water. When the caustic soda concentration is increased, the contact portion between the exhaust gas and the caustic soda is lowered, and the reaction efficiency with the acid gas in the exhaust gas is lowered. Therefore, while the acid gas concentration cannot be reduced below the regular value, there arises a problem that the amount of caustic soda must be increased to increase the number of moles in order to sufficiently reduce the acid gas concentration.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and does not use a nozzle as a separate body, but includes three fluids: a liquid from one nozzle and a liquid that generates a solid by mixing with the liquid and a gas such as air. It is an object of the present invention to provide a nozzle that mixes and sprays the above two fluids and prevents the flow path from being clogged with solids generated when the two fluids are mixed.

In order to solve the above problems, the present invention is firstly a three-fluid nozzle for mixing and spraying a gas, a first liquid and a second liquid, wherein the first liquid and the second liquid are mixed to form a solid material. Consisting of liquid to be generated,
The gas, the first liquid, and the second liquid are provided with three flow paths that are supplied from separate pipes, and the gas and the first liquid are mixed in the flow paths, and / or the gas and the second liquid. A first injection port for injecting the first liquid or a mixed fluid of the first liquid and the gas, and injecting a second liquid or a mixed fluid of the second liquid and the gas. A second nozzle hole is provided,
There is provided a three-fluid nozzle characterized in that the fluid ejected from the first nozzle hole and the second nozzle hole is externally mixed without being mixed until reaching the nozzle holes to generate spray.

The gas is compressed air, and the second liquid is a diluted liquid of the first liquid.
When the three-fluid nozzle is used as an exhaust gas cooling nozzle installed in a gas cooling tower of a waste treatment apparatus, the first liquid dilutes the first liquid and the second liquid dilutes the first liquid. It consists of wastewater generated from a waste incinerator containing calcium components and a melting furnace for incinerated ash, and a solid (scale) made of calcium hydrate is generated by mixing the first liquid and the second liquid, and the second liquid The foreign matter contained in the waste water becomes obvious, further increases in viscosity, and the nozzle flow path, particularly the mixing part, is likely to be clogged.

  In the three-fluid nozzle according to the first aspect of the invention, the first liquid and the second liquid are not mixed inside the nozzle but are mixed outside, so that the solid inside the nozzle is generated by mixing the first liquid and the second liquid. It does not cause clogging in the flow path and mixing section. In addition, the first liquid and the second liquid are mixed in the vicinity of the nozzle, and one of the first liquid and the second liquid is mixed with the gas inside the nozzle and atomized, and the atomization is performed. Since one of the first liquid and the second liquid is externally mixed with the mixed fluid, the particles of the three fluids to be externally mixed are further atomized.

  The external mixing in the present invention refers to the mixing in the vicinity of the nozzle where mixing occurs at the same time as the fluid is ejected from the nozzle, and does not refer to only mixing outside the position away from the nozzle tip nozzle.

Specifically, it has a triple pipe structure including a central flow path formed along the axis, an intermediate flow path surrounding the central flow path, and an outer peripheral flow path surrounding the intermediate flow path. The gas, the first liquid, and the second liquid pipes are connected respectively.
For example, the central flow path is a basic aqueous solution flow path, the intermediate flow path is a drainage flow path, the outer peripheral flow path is a compressed air flow path, and the intermediate flow path and the outer peripheral flow path are disposed inside the nozzle. The mixing part of compressed air and waste water is provided in the vicinity of the nozzle, and a mixed fluid of the compressed air and drain is externally mixed with a basic aqueous solution that is jetted from the nozzle at the tip of the central channel.

As a form of external mixing, the nozzle is a single head type, the first nozzle hole is surrounded by the second nozzle hole, and the first nozzle hole is protruded from the second nozzle hole.
Alternatively, a plurality of the second nozzle holes are arranged to protrude from the tip of the nozzle body, and the first nozzle is provided at the tip of the nozzle body, and the first nozzle and the second nozzle are provided. The fluid to be ejected is mixed by external collision.
In both cases of the single-head nozzle and the multi-head nozzle, a mixed fluid of a gas composed of compressed air and a second liquid composed of drainage is ejected from the second nozzle, and the first liquid composed of a basic aqueous solution is ejected. It is preferable that the first liquid and the second liquid be ejected from the first nozzle and mixed outside in the vicinity of the nozzle.

In the mixing part of the gas and the first liquid or / and the mixing part of the gas and the second liquid inside the nozzle, the fluid that causes one fluid to flow in from the peripheral wall of the flow path and collides or rotates and mixes with the other fluid. It is preferable to provide a atomization mechanism.
Further, as another means of fluid atomization mechanism, at least one of the central flow channel, the intermediate flow channel, and the outer peripheral flow channel is provided with a waller for generating a rotating flow to atomize the fluid. It is preferable to let it be. It should be noted that a waller may be interposed in all three.
By providing the atomization mechanism as described above, the three fluids can be sprayed as fine particles, and when used as an exhaust gas cooling nozzle, the removal efficiency of acidic components in the exhaust gas, the exhaust gas cooling efficiency can be increased, It is possible to prevent wetting in the cooling tower and reduce running costs.

Secondly, the present invention is a three-fluid nozzle for mixing and spraying gas, first liquid and second liquid, wherein the first liquid and the second liquid are composed of a liquid which generates a solid by mixing,
The gas, the first liquid, and the second liquid are provided with three flow paths that are supplied from separate pipes, and a mixing portion of the first liquid and the second liquid is provided in the nozzle, A three-fluid nozzle characterized in that the gas nozzle is provided at an outer peripheral position, and the gas is externally mixed with the mixed liquid of the first liquid and the second liquid mixed immediately before spraying to generate spray. providing.

In the three-fluid nozzle according to the second aspect of the invention, the first liquid and the second liquid are mixed inside the nozzle. The nozzle has a relatively wide cross-sectional area and is mixed in the nozzle so as to be substantially similar to external mixing. Therefore, clogging does not occur in the flow path inside the nozzle. Moreover, since the liquid mixture of gas, the said 1st liquid, and the 2nd liquid is mixed outside the nozzle, the liquid mixture can be atomized with gas and sprayed.
In the case where the nozzle has a triple pipe structure and the exhaust gas cooling nozzle is used, compressed air is used as the gas, a basic aqueous solution is used as the first liquid, waste water is used as the second liquid, and a fluid atomization mechanism is preferably provided. This is similar to the first invention.

Thirdly, the present invention is a three-fluid nozzle for mixing and spraying gas, first liquid and second liquid, wherein the first liquid and the second liquid are composed of a liquid which generates a solid by mixing,
Three flow paths for supplying the gas, the first liquid, and the second liquid individually are provided, and the mixing section of the gas and the first liquid or / and the mixing of the gas and the second liquid are provided in the flow paths. And a mixing unit for mixing the first liquid or a mixed fluid of the first liquid and the gas and a second liquid or a mixed fluid of the second liquid and the gas immediately before the nozzle A three-fluid nozzle is provided, characterized in that the first liquid and the second liquid are mixed immediately before the nozzle to generate spray.

  Similarly to the first and second three-fluid nozzles, the three-fluid nozzle has a triple-pipe structure, and in the case of an exhaust gas cooling nozzle, the compressed air is used as the gas, the basic aqueous solution is used as the first liquid, and the second liquid is used. It is preferable to provide a fluid atomization mechanism using waste water.

In the three-fluid nozzle according to the third aspect of the present invention, the gas is circulated through the central flow path, and the mixing unit for mixing the gas with either the first liquid or the second liquid is provided, and the downstream of the mixing unit and It is preferable to provide a mixing unit that mixes the mixed fluid with the other one of the first liquid and the second liquid immediately before the nozzle.
As described above, when the first liquid and the second liquid are mixed immediately before the nozzle hole, the occurrence of clogging due to the generated solid matter can be minimized, and either the first liquid or the second liquid is used. One atom is mixed with the gas first, so atomization is achieved. By mixing this atomized mixed fluid and the other liquid immediately before the nozzle, a mixed atomization of three more atomized fluids is generated. It can be made.

Fourthly, according to the present invention, any of the three-fluid nozzles described above is installed as a nozzle for cooling high-temperature exhaust gas in a cooling tower for exhaust gas generated from a waste incinerator or / and a melting furnace for incinerated ash. A waste disposal apparatus having a fluid nozzle is provided.
In the case of the exhaust gas cooling nozzle, the first liquid is provided with drainage circulation means that uses wastewater generated in a waste incinerator or / and a melting furnace, and water is a closed system. In addition, since the caustic soda aqueous solution is used as the second liquid and the exhaust gas is absorbed by the atomized liquid, the acidic component contained in the exhaust gas is neutralized with caustic soda, so that the acidic component is efficiently removed. Can do.

  It is preferable that a bag filter is installed downstream of the cooling tower, and dust, acid gas, dioxins, and heavy metals are further removed by the bag filter and then exhausted from the chimney.

As described above, according to the present invention, the first liquid and the second liquid are not mixed inside the nozzle, but mixed outside the vicinity of the nozzle, and the solid produced by mixing the first liquid and the second liquid inside the nozzle. It is possible to prevent clogging of the flow path and the mixing part due to the material. In addition, one of the first liquid and the second liquid is mixed with gas inside the nozzle to be atomized, and either the first liquid or the second liquid is externally mixed with the atomized mixed fluid. Therefore, the three fluid particles to be externally mixed can be sufficiently atomized. Moreover, the substantially similar effect can be obtained also by mixing just before the nozzle hole, not outside the nozzle hole.
In addition, when mixing the 1st liquid and the 2nd liquid inside a nozzle, since it mixes just before a nozzle hole, it can suppress that clogging generate | occur | produces inside a nozzle with the scale generated by mixing.

  In addition, the three-fluid nozzle of the present invention is attached to the gas cooling tower of the waste treatment apparatus to form an exhaust gas cooling nozzle, and a basic aqueous solution such as an aqueous solution of caustic soda that absorbs and neutralizes acidic components in the exhaust gas is used as the first liquid. When wastewater generated in a waste incinerator or melting furnace is used as a diluting solution for a basic aqueous solution, it is possible to prevent the generation of scale caused by the mixing of the wastewater and the basic aqueous solution and the appearance of foreign matter. Clogging can be eliminated, and maintenance of the nozzle can be minimized. Further, since the three-fluid spray sprayed from the nozzle is atomized, the contact portion with the exhaust gas is increased, the removal performance of acidic components in the exhaust gas can be improved, and the wastewater can be treated with a closed system. There are also advantages.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic view of a waste treatment apparatus using the three-fluid nozzle of the present invention.
As shown in FIG. 1, a first gas cooling tower 2, a first bag filter 3, a first fan 4, and a chimney 5 are connected to the downstream side of the waste incinerator 1 through a conduit L <b> 1.
Incineration ash generated after waste incineration by high-temperature heating in the waste incinerator 1 and incineration fly ash generated in the first gas cooling tower 2 and the first bag filter 3 are charged into the melting furnace 6 and melted at a high temperature.
A second gas cooling tower 7, a second bag filter 8, and a second fan 9 are connected downstream of the melting furnace 6 via a conduit L 2, and the gas after passing through the second fan 9 is introduced into the chimney 5. The waste incinerator 1 side gas is released into the atmosphere.

As shown schematically, the three-fluid nozzle 10 of the present invention is attached to the first gas cooling tower 2 and the second gas cooling tower 7. The three-fluid nozzle 10 is supplied with three fluids of the caustic soda aqueous solution storage tank 11 from the caustic soda aqueous solution N, the waste water W generated in the waste incinerator 1 and the melting furnace 6, and the compressed air A from the compressor 12 through the pipes T1, T2, and T3. Supply.
By circulating the waste water from the waste incinerator 1 and the melting furnace 6 to the three-fluid nozzle 10, a closed system is formed in which the waste water is not discharged out of the waste treatment apparatus.

2 and 3 show the three-fluid nozzle 10 of the first embodiment.
The three-fluid nozzle 10 has a triple-pipe structure including an inner tube 15, an intermediate tube 16, and an outer tube 17. The three-fluid nozzle 10 has a central flow path R <b> 1 through which a caustic soda aqueous solution N flows through a hollow portion of the inner tube 15, an inner tube 15 and an intermediate tube 16. Between the intermediate pipe R2 and the intermediate pipe 16 and the outer pipe 17, an outer peripheral flow path R3 through which the compressed air A flows is provided.

  The injection-side tips of the inner tube 15, the intermediate tube 16, and the outer tube 17 c are sequentially projected forward with dimensions, and are externally fitted with a cap 18. An opening is provided in the center of the tip of the cap 18, and the injection end portion 15 a of the inner tube 15 protrudes from the opening. The tip opening serves as the first injection port 20, and the caustic soda aqueous solution N is injected. The tip opening of the cap 18 surrounding the first nozzle 20 is a second nozzle 21, and a mixed fluid of the waste water W and the compressed air A is injected.

  A caustic soda aqueous solution supply port 15b is provided at the rear end of the inner pipe 15 forming the central flow path R1 and connected to the pipe T1, and a drainage supply port 16b is formed on the peripheral wall on the rear end side of the middle pipe 16 forming the intermediate flow path R2. Is connected to the pipe T2, and a compressed air supply port 17b is provided on the peripheral wall on the rear end side of the outer pipe 17 forming the outer peripheral flow path R3, and is connected to the pipe T3.

The middle pipe 16 is provided with a partition wall portion 16c that is brought into contact with the outer peripheral surface of the inner pipe 15, and an orifice 16d is formed in the partition wall portion 16c at intervals in the circumferential direction so as to face the downstream side of the injection side. The flow rate of the waste water W is increased.
The upstream side of the partition wall portion 16c is provided with a step on the inner peripheral surface to reduce the diameter, and the compressed air inflow hole 16e is provided in the peripheral wall on the downstream side of the injection wall from the partition wall portion 16c with a space in the circumferential direction. The downstream side of the injection wall from the partition wall portion 16 c is a mixing portion 22, and the tip of the intermediate tube 16 is in contact with the inner surface of the cap 18.

  The distal end opening of the outer tube 17 communicates with the inner surface of the cap 18 and the hollow portion 23 surrounded by the middle tube 16. The compressed air A is caused to flow into the hollow portion 23, and is allowed to flow into the mixing portion 22 through the compressed air inflow hole 16 e of the intermediate tube 16 facing the hollow portion 23, thereby mixing the drainage W and the compressed air A. The mixing portion 22 communicates with the second injection port 21 whose diameter is reduced in a step shape in the cap 18, and the mixed fluid of the waste water W and the compressed air A is injected from the second injection port 21.

  In the three-fluid nozzle 10 having the above-described configuration, the caustic soda aqueous solution N supplied from the pipe T1 flows through the central flow path R1 and is jetted from the first nozzle 20. Waste water W supplied from the pipe T2 to the intermediate flow path R2 flows into the mixing unit 22 through the orifice 16d. The compressed air A supplied from the pipe T3 to the outer peripheral flow path R3 flows from the outer peripheral flow path R3 through the compressed air inflow hole 16e into the mixing portion 22 of the intermediate flow path R2. In the mixing portion, the compressed air A flowing in from the outer periphery toward the center and the waste water W whose flow velocity is increased through the orifice 16d are collided and mixed, and the mixed fluid of the waste water W and the compressed air A is atomized. .

  The atomized mixed fluid is ejected as gas-liquid mixed mist M from the second nozzle 21. The first nozzle 20 protrudes from the center of the second nozzle 21, and the caustic soda aqueous solution N is injected from the first nozzle 20, whereby the compressed air N injected from the second nozzle 21 is atomized with the waste water. The liquid mixing mist M is externally mixed while surrounding the spray of the caustic soda aqueous solution N.

With the above configuration, the waste water W and the aqueous caustic soda solution N are not mixed inside the three-fluid nozzle 10 but are mixed outside the first nozzle 20, so the inside of the three-fluid nozzle 10 is basic with the waste water W containing calcium components. Solid matter (calcium hydrate) generated by mixing with the aqueous caustic soda solution N that is a neutralizing agent is not generated, and clogging can be prevented from occurring in the nozzle internal flow path and the mixing portion.
Further, since the waste water W is mixed with the compressed air A in the mixing unit 22 and atomized, the caustic soda aqueous solution N is externally mixed in the vicinity of the first nozzle 20 with the atomized mixed fluid. It is atomized by mixing with gas-liquid mixed mist M.

  As described above, since the aqueous solution of caustic soda is atomized and sprayed from the gas cooling nozzle, the contact area with the exhaust gas is increased, the absorption rate of the acidic component in the exhaust gas is increased, and the cooling efficiency of the exhaust gas is increased. it can. In addition, since waste water generated in an incinerator or melting furnace is used as a dilute solution of caustic soda solution and an exhaust gas coolant, the waste water can be treated with a closed system.

4A and 4B show a second embodiment.
The difference from the first embodiment is that the nozzle tip is a single-head type in the first embodiment, but the three-fluid nozzle 30 of the second embodiment is a multi-head type.

  The three-fluid nozzle 30 has a multi-headed Y-shaped adapter 32 connected to the downstream ends of the inner tube 15 ′, the middle tube 16 ′, and the outer tube 17 ′. A pair of chip attachment portions 32b are provided at the distal ends of the branch portions 32a of the adapter 32 so as to protrude in directions close to each other.

A central flow path portion R1 ′ communicating with the inner tube 15 ′ is provided at the center of the base portion 32c of the adapter 32, a first injection port 20 ′ is provided at the tip of the base portion 32, and a caustic soda aqueous solution is injected.
Further, an intermediate flow path R2 ′ through which the waste water W flows from the base portion 32c of the adapter 32 to the branch sections 32a on both sides and an outer peripheral flow path R3 ′ through which the compressed air A flows are provided.

A nozzle tip 33 is fitted and fixed to the pair of tip mounting portions 32b, and a second nozzle hole 21 'for spraying a gas-liquid mixed mist M of the waste water W and the compressed air A is provided at the tip that is close to and opposed to the tip tip attachment portion 32b. Yes.
The compressed air flow path 33a provided in the nozzle chip 33 communicates with the outer peripheral flow path R3 ′, the drainage flow path 33b communicates with the intermediate flow path R2 ′, and squeezes the axial center of the nozzle chip 33. The waste water W is introduced into the air A from the outer peripheral side by the mixing part 33d, and the waste water Wa is atomized and mixed. The gas-liquid mixed mist M is sprayed from the second nozzle 21 'through the small diameter portion 33e, the large diameter portion 33f, and the small diameter portion 33g continuously from the mixing portion 33d.

In the three-fluid nozzle 30 according to the second embodiment, the compressed air A and the waste water W are mixed by the nozzle tip 33 and opposedly jetted from the second nozzle 21 ′ to perform collision mixing. In addition, since the caustic soda aqueous solution N is injected from the first nozzle 20 ′ to the collision mixing position, the caustic soda aqueous solution N is further collided and mixed with the gas-liquid mixing mist M of the compressed air A and the waste water W. As described above, the caustic sorter aqueous solution N is externally collided with the gas-liquid mixing mist M, so that no solid matter is generated inside the three-fluid nozzle 30 and the caustic sorter aqueous solution can be atomized and sprayed. Moreover, the removal function of the acidic component of exhaust gas and the cooling efficiency of exhaust gas can be improved.
Since other configurations and operations are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

5A and 5B show a third embodiment.
The difference between the three-fluid nozzle 40 of the third embodiment and the nozzle 10 of the first embodiment is that the caustic soda aqueous solution N flowing through the central flow path R1 inside the three-fluid nozzle also squeezes through the outer peripheral flow path R3. The air A is mixed and the gas-liquid mixed mist M1 of the caustic soda aqueous solution N and the compressed air A is injected from the first nozzle 20. From the second nozzle hole 21 on the outer periphery of the first nozzle hole 20, the gas-liquid mixed mist M2 of the waste water W and the compressed air A is injected as in the first embodiment, and the gas-liquid mixed mist M1 and M2 are externally mixed. Caustic soda aqueous solution N and waste water W are not mixed inside the nozzle as in the first embodiment.

  As shown in an enlarged view in FIG. 5 (A), between the hole 16b "provided in the intermediate tube 16" and the hole 15b "provided in the inner tube 15", the outer flow path R3 is squeezed to the central flow path R1. A communication small diameter cylinder 41 through which air A flows is attached. A plurality of small diameter cylinders 41 for communication are provided at intervals in the circumferential direction, and are attached across the intermediate flow path R2 while being inclined toward the injection side. The communication small-diameter cylinder 41 protrudes into the central flow path R1 from the hole 16b ″ of the inner tube 16 ″, and the compressed air A flows into the central flow path R1 from the outer peripheral side toward the injection side. In addition, an orifice 15c ″ is provided in the rear periphery of the hole 15b ″ through which the communication small-diameter cylinder 41 protrudes, and compressed air A flowing from the communication small-diameter cylinder 41 into the caustic soda aqueous solution N flowing through the orifice 15c ″ from the outer peripheral side. Mixing is performed to atomize the aqueous caustic soda solution N.

The configuration in which the compressed air inflow hole 16c ″ is provided on the injection side of the middle pipe 16 ″, the compressed air A flows into the intermediate flow path R2 from the outer peripheral flow path R3, and is mixed with the waste water W is the same as in the first embodiment. is there. Therefore, in 3rd Embodiment, after mixing the caustic soda aqueous solution N and the compressed air A, the waste_water | drain W and the compressed air A are mixed first.
Accordingly, a gas-liquid mixed mist M1 of the caustic soda aqueous solution N and the compressed air A is injected from the first nozzle 20, and a gas-liquid mixed mist of the drainage W and the compressed air A is surrounded from the second nozzle 21 surrounding the first nozzle 20. M2 is injected, and these gas-liquid mixing mists M1 and M2 are externally mixed in the vicinity of the first nozzle 20.
Since other configurations and operations are the same as those in the first embodiment, the same reference numerals are given and description thereof is omitted.

6A and 6B show a fourth embodiment.
The three-fluid nozzle 50 of the fourth embodiment mixes and injects the caustic soda aqueous solution N and the waste water W inside the first nozzle 20 ″, and presses the compressed air A from the second nozzle 21 ″ surrounding the first nozzle 20 ″. These three fluids are mixed outside the vicinity of the nozzle.

  In the fourth embodiment, an X-shaped whirler 51 that generates a swirling flow is attached to the inside of the inner tube 15 "', and a very small diameter cylindrical portion 15c"' at the front side of the injection side is connected to the front end opening of the middle tube 16 "'. On the other hand, the front side of the injection side of the middle tube 16 "'protrudes from the inner tube 15"' and the inner surface of the tip is inwardly tapered, and is surrounded by the tapered portion. The portion is a first nozzle hole 20 ″ having a relatively large area and a flow path length. The tip opening of the small cylinder portion 15c ″ ′ is positioned at the center position inside the first nozzle hole 20 ″, and the caustic soda aqueous solution N and the waste water W are mixed inside the first nozzle hole 20 ″ immediately before the injection, Injecting from one nozzle 20 ".

  A cap 18 'attached to the tip of the injection side is fitted on the injection side of the outer tube 17 "' and is spaced in a state where the injection side of the injection side inner tube 16" 'protrudes from an opening provided in the center of the front wall. A narrow annular second nozzle hole 21 ″ is provided on the outer periphery of the first nozzle hole 20 ″, and compressed air A is injected from the second nozzle hole 21 ″.

With the above configuration, the aqueous caustic soda N flowing through the central flow path R1 is injected into the first injection port 20 ″ from the very small diameter cylindrical portion 15c ″ ′ while being swirled through the whirlers 51. The waste water W flowing through the intermediate flow path R2 is injected from the first nozzle 20 "and mixed with the aqueous caustic soda solution N that is injected inside the first nozzle 20" and outside the vicinity of the nozzle.
Compressed air A is injected from the outer peripheral second nozzle 21 ″ so as to surround the mixed spray of the waste water W and the caustic soda aqueous solution N, and the compressed air A is discharged from the vicinity of the first and second nozzles to the drainage W and the caustic soda aqueous solution. Externally mixed with N and sprayed as gas-liquid mixed mist.

In the three-fluid nozzle 50, the caustic soda aqueous solution N forms a swirling flow and is atomized, and is mixed with the waste water W and the inside of the first injection port 20 ″ to suppress the generation of scale. Since 20 ″ has a relatively wide cross-sectional area, the flow path inside the nozzle is not clogged.
Since other configurations and operations are the same as those in the first embodiment, the same reference numerals are given and description thereof is omitted.

FIG. 7 shows a fifth embodiment.
The three-fluid nozzle 60 of the fifth embodiment mixes the compressed air A and the aqueous caustic soda solution N inside the nozzle, and mixes the gas-liquid mixed fluid with the waste water W inside the nozzle and in the vicinity of the nozzle, so that the three fluids are inside the nozzle. And sprayed from one nozzle hole 61 in a mixed state.

  Although the point which consists of the triple pipe structure of the inner pipe 150, the middle pipe 160, and the outer pipe 170 is the same as that of 1st Embodiment, the central flow path R1 comprised by the inner pipe 150 is connected with the piping T3, and the compressed air A of As a flow path, an intermediate flow path R2 between the inner pipe 150 and the intermediate pipe 160 is connected to the pipe T1 to form a flow path of the caustic soda aqueous solution N, and an outer peripheral flow path R3 between the intermediate pipe 160 and the outer pipe 170 is piped. It is connected to T2 as a flow path for drainage W. The channel width of the annular intermediate channel R2 through which the aqueous caustic soda solution N is circulated is made smaller than the channel width of the annular outer peripheral channel R3 through which the drainage W is circulated.

Specifically, a small-diameter portion 150a is provided on the distal end side of the inner tube 150, an opening 150b is provided at the distal end of the small-diameter portion 150a, and the opening 150b is surrounded by a distal-end tapered portion 160a of the middle tube 160, Is the primary mixing unit 62. An opening 160b is provided at the center of the tip of the primary mixing portion 62, and a spacer 65 having a hole 65a provided in the intermediate flow path R2 to the primary mixing portion 61 is provided in the circumferential direction. A tip tapered portion 170a of the outer tube 170 surrounds the tip tapered portion 160a of the middle tube 160 with a small-diameter outer peripheral flow path R3 ′ ″, and an opening 170b is provided at the center thereof.
The nozzle tip 65 is attached to the outer tube 170 via the cap 63, and a large-diameter secondary mixing portion 66 is provided between the outer tube 170 and the distal end surface of the outer tube 170. A nozzle hole 61 having a reduced diameter is provided.
The tip opening 150b of the inner tube 150, the tip opening 160b of the middle tube 160, and the tip opening 170b of the outer tube 170 are provided in series with the nozzle 61 along the axis of the nozzle.

  In the three-fluid nozzle 60 having the above-described configuration, the compressed air A whose flow velocity is increased through the small diameter portion 150b of the inner pipe 150 is caused to flow into the center of the primary mixing portion 62 and the flow velocity is increased through the flow path 65a of the spacer 65. The aqueous solution N flows from the outer peripheral side of the primary mixing unit 61, and the compressed air A and the caustic soda aqueous solution N are mixed in the primary mixing unit 61. The primarily mixed gas-liquid mixed fluid flows from the opening 160b into the secondary mixing section 66 through the small-diameter outer peripheral flow path R3 'and the opening 170b. When the gas-liquid mixed fluid passes through the small-diameter outer peripheral flow path R3 ′ ″, the waste water W is collided and mixed from the outer periphery, and the waste water W also flows into the secondary mixing portion 66 through the opening 170b. The three fluids are stirred and mixed evenly and are ejected from the nozzle 61.

With the above configuration, the aqueous caustic soda solution N is mixed with the compressed air A first, so that the atomization is achieved. The three-fluid mixed spray can be generated.
In addition, the caustic soda aqueous solution N is circulated through the outer peripheral flow path R3, the waste water W is circulated through the intermediate flow path R2, the compressed air A and the waste water W are mixed first, and the caustic soda aqueous solution N is mixed with this mixed fluid at the nozzle straight line. You may mix.
Since other configurations are the same as those of the first embodiment, description thereof is omitted.

1 is an overall schematic diagram of a waste treatment apparatus in which a three-fluid nozzle according to an embodiment of the present invention is used. The three-fluid nozzle of 1st Embodiment is shown, (A) is sectional drawing, (B) is a front view. It is a principal part enlarged view of the three fluid nozzle of 1st Embodiment. The three fluid nozzle of 2nd Embodiment is shown, (A) is a principal part expanded sectional view, (B) is a front view. The three fluid nozzle of 3rd Embodiment is shown, (A) is a principal part expanded sectional view, (B) is a front view. The three fluid nozzle of 4th Embodiment is shown, (A) is a principal part expanded sectional view, (B) is a front view. It is sectional drawing of the three fluid nozzle of 5th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Waste incinerator 2 1st gas cooling tower 6 Melting furnace 7 2nd gas cooling tower 10 Three fluid nozzle 15 Inner pipe 16 Middle pipe 17 Outer pipe 18 Cap 20 1st injection hole 21 2nd injection hole 22 Mixing part R1 Central flow path R2 Intermediate flow path R3 Peripheral flow path A Compressed air N Caustic soda aqueous solution W Drainage T1 Caustic soda aqueous solution piping T2 Drainage piping T3 Compressed air piping

Claims (14)

A three-fluid nozzle for mixing and spraying a gas, a first liquid, and a second liquid, wherein the first liquid and the second liquid are composed of a liquid that generates a solid by mixing;
The gas, the first liquid, and the second liquid are provided with three flow paths that are supplied from separate pipes, and the gas and the first liquid are mixed in the flow paths, and / or the gas and the second liquid. A first injection port for injecting the first liquid or a mixed fluid of the first liquid and the gas, and injecting a second liquid or a mixed fluid of the second liquid and the gas. A second nozzle hole is provided,
A three-fluid nozzle characterized in that the fluid ejected from the first nozzle hole and the second nozzle hole is externally mixed without being mixed until reaching the nozzle holes to generate spray. A three-fluid nozzle for mixing and spraying a gas, a first liquid, and a second liquid, wherein the first liquid and the second liquid are composed of a liquid that generates a solid by mixing;
The gas, the first liquid, and the second liquid are provided with three flow paths that are supplied from separate pipes, and a mixing portion of the first liquid and the second liquid is provided in the nozzle, A three-fluid nozzle characterized in that the gas nozzle is provided at an outer peripheral position, and the gas is externally mixed with the mixed liquid of the first liquid and the second liquid mixed immediately before spraying to generate spray. A three-fluid nozzle for mixing and spraying a gas, a first liquid, and a second liquid, wherein the first liquid and the second liquid are composed of a liquid that generates a solid by mixing;
Three flow paths for supplying the gas, the first liquid, and the second liquid individually are provided, and the mixing section of the gas and the first liquid or / and the mixing of the gas and the second liquid are provided in the flow paths. And a mixing unit for mixing the first liquid or a mixed fluid of the first liquid and the gas and a second liquid or a mixed fluid of the second liquid and the gas immediately before the nozzle A three-fluid nozzle characterized in that it is configured to generate spray by mixing the first liquid and the second liquid immediately before the nozzle.   The three-fluid nozzle according to any one of claims 1 to 3, wherein the gas is compressed air, and the second liquid is a diluted liquid of the first liquid.   The first liquid comprises a basic neutralizer aqueous solution containing caustic soda, etc., the second liquid comprises waste water containing a calcium component for diluting the first liquid, and the calcium hydrate is mixed with the first liquid and the second liquid. The three-fluid nozzle according to claim 4, wherein the solid matter is generated and the foreign matter contained in the second liquid is made visible.   A triple pipe structure including a central flow path formed along the shaft core, an intermediate flow path surrounding the central flow path, and an outer peripheral flow path surrounding the intermediate flow path; The three-fluid nozzle according to any one of claims 1 to 5, wherein pipes for one liquid and a second liquid are connected to each other.   The three-fluid nozzle according to any one of claims 1 and 4, wherein the first nozzle hole is surrounded by a second nozzle hole, and the first nozzle hole is protruded from the second nozzle hole.   A plurality of the second nozzle holes are arranged to protrude from the tip of the nozzle main body so as to face each other, and the first nozzle is provided at the tip of the nozzle main body to be injected from the first nozzle and the second nozzle. The three-fluid nozzle according to any one of claims 1 to 4, wherein the fluid to be mixed is subjected to external collision mixing.   The three-fluid nozzle according to claim 7 or 8, wherein a mixed fluid of the gas and the second liquid is jetted from the second nozzle and the first liquid is jetted from the first nozzle and externally mixed.   10. The fluid mixing mechanism according to claim 1, further comprising a fluid atomization mechanism that causes one fluid to flow in from a circumferential wall of the flow path and collide or rotationally mix with the other fluid. The three-fluid nozzle described.   A gas is circulated through the central flow path, and the mixing unit for mixing the gas and either the first liquid or the second liquid is provided, and the mixed fluid and the first liquid are provided downstream of the mixing unit and immediately before the nozzle. The three-fluid nozzle according to any one of claims 3 to 6, further comprising a mixing unit that mixes either the liquid or the second liquid.   The at least one flow path among the central flow path, the intermediate flow path, and the outer peripheral flow path is provided with a waller for generating a rotating flow and atomizing the fluid. The three-fluid nozzle according to item.   A three-fluid nozzle according to any one of claims 1 to 12 is installed as a nozzle for exhaust gas cooling in a cooling tower for exhaust gas generated from a waste incinerator or / and a melting furnace for incinerated ash. Garbage disposal device with fluid nozzle.   14. Waste treatment with a three-fluid nozzle according to claim 13, comprising waste water circulation means using waste water generated in a waste incinerator and / or melting furnace as the first liquid, and using a caustic soda aqueous solution as the second liquid. apparatus.

Images