JPH09900A - Apparatus for mixing powder and gas - Google Patents

Abstract

PURPOSE: To reduce unevenness in the dispersion of powder by connecting a main pipe for conducting a first flux of powder to both an injection pipe for injecting a second flux of powder and a stirring pipe for injecting a third flux of powder so as to mix gas and powder with each other by using whirling gas flow. CONSTITUTION: An injection pipe 3 for injecting a mixed flow 4 as a second powder into a main pipe 1 is connected to the main pipe 1 for allowing air 2 as a first gas to flow in order to form a whirling flow. In a downstream side of the injection pipe, a nozzle 6 as a stirring pipe for injecting air 7 as a third gas into the main pipe 1 in a tangential direction of the main pipe 1 is connected to the main pipe 1 in order to generate a whirling flow whirling in a direction opposite to that of a whirling flow formed by the injection of the mixed flow 4. As a result, two whirling flows having different whirling directions according to the flow directions are generated. A powdery chemical in the mixed flow 4, which is injected through the injection pipe 3, is made to uniformly disperse in air 2, 7 acting as the first gas and the third gas so that there are less chances of causing unevenness in the mixture of the powder chemical and the air.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a mixture of powder and gas applied to a mixing device for mixing powdered chemicals and air in an exhaust gas treatment facility of a plant for generating air pollutant gas such as a refuse incineration plant. Regarding the device.

[0002]

2. Description of the Related Art In plants that generate air pollutant gases such as refuse incineration plants, powder chemicals (hereinafter simply referred to as powder The harmful components in the exhaust gas that cause air pollution gas are neutralized to make them harmless, or they are removed and discharged into the atmosphere. In order to effectively carry out this treatment, it is necessary to disperse the powder in the exhaust gas as evenly as possible to increase the contact area between the powder and the exhaust gas.

For this reason, the powder is uniformly dispersed in the air and mixed with the powder-air mixture before entering the exhaust gas stream.
It is necessary to keep in phase. That is, air and exhaust gas,
In so-called gas, both gases tend to disperse uniformly, so that the contact area between the powder and air is made large so that when the powder-mixed air is mixed with the exhaust gas. As a result, the powder is evenly dispersed in the exhaust gas, and the reaction between the powder and the exhaust gas can be made effective.

In the mixing of the powder and the air for uniformly dispersing the powder in the exhaust gas, a large amount of air is conventionally flowed to transfer the powder into the carrier air during extremely low concentration transportation. The method of even distribution was adopted. However,
Even with a method of flowing a large amount of this air and increasing the contact area between the powder and air on average, it is easy to cause uneven distribution of the powder in the air, and when such air is mixed with the exhaust gas,
The unreacted powder was discharged to the outside as it was, and the exhaust gas treatment became insufficient, or the powder had to be used more than necessary.

Further, depending on the properties of the exhaust gas to be treated, it may be necessary to increase the amount of the mixed powder. In such a case, the powder is evenly distributed in the exhaust gas by the above-mentioned method. If you try to disperse it, you have to increase the amount of air, so the processing equipment becomes large-scale,
It was difficult to manufacture, assemble and install it, and there was a problem that the cost increased.

[0006]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems caused by mixing by a device that has been conventionally used in order to uniformly mix powder with gas. Mixing is performed using a swirling air flow to reduce unevenness in the dispersion of powder in the gas, and even when a large amount of powder is mixed, it can be made into a small-scale device and is easy to manufacture, assemble, and install. It is an object of the present invention to provide a powder / gas mixing device that can achieve low cost.

[0007]

Therefore, the powder-gas mixing apparatus according to the first aspect of the present invention has the following means.
(1) A main pipe for flowing the first gas or the first powder fluid in which the first powder is mixed in the first gas is provided. (2) The second gas injected into the main pipe or the second powder fluid in which the second powder is mixed with the second powder is injected into the main pipe so as to generate a swirling flow in the main pipe. The injection pipe was connected to the main pipe at a mounting angle. (3) The third gas injected into the main pipe, or the third powder fluid in which the third powder is mixed with the third powder, is the second gas injected in the injection pipe in the main pipe, or The stirring pipe was connected to the main pipe at the downstream side of the position where the injection pipe was connected at an attachment angle that generated a so-called reverse swirl flow in which the powder fluid of No. 2 swirl in the direction opposite to the swirl flow generated in the main pipe.

At least one of the above-mentioned means (1) to (3) is preferably a means for flowing or injecting a powdered fluid. In addition, the first gas, the second gas, the third gas, the first powder fluid, the second powder fluid, and the third powder fluid may be different from each other or of the same type. It is a thing.

The powder and gas mixing apparatus according to a second aspect of the present invention is the following means among the above-mentioned means (1) to (3). (4) First gas or first powder fluid flowing in the main pipe, and third gas or third powder fluid injected from the stirring pipe into the main pipe to generate a reverse swirl flow in the main pipe Are of the same type. That is, in the means of the present invention, if the gas flowing in the main pipe is the first gas, the third gas same as the first gas is injected into the main pipe from the stirring pipe, and the gas flowing in the main pipe is If it is the first powder fluid, the same powder fluid as the first powder fluid is injected into the main pipe from the stirring tube.

The powder and gas mixing apparatus according to a third aspect of the present invention has the following means. (5) The same main pipe as the above-mentioned means (1) is provided. (6) A tip portion is inserted into the inside of the main pipe, and an inflow pipe is provided to inject the second gas or the second powder fluid in which the second powder is mixed with the second gas into the main pipe. . When the second gas or the second powdered fluid is injected into the main pipe, a swirling flow may be generated in the main pipe, or the second gas or the second powdered fluid may be injected in parallel with the direction of the main pipe and the inside of the main pipe may be injected. The swirling flow of
It may be injected so that it does not occur. (7) A stirring blade for generating a swirling flow in the flow in the main pipe is installed between the outer peripheral surface of the tip end of the inflow pipe inserted into the main pipe and the inner peripheral surface of the main pipe facing the inflow pipe. (8) A reverse swirl flow, which is connected to the main pipe on the downstream side of the inlet of the inflow pipe inserted into the main pipe and swirls in the direction opposite to the swirl flow generated on the upstream side by the stirring blade, is generated in the main pipe. An agitating tube for injecting the third gas or the third powder fluid in which the third powder is mixed with the third powder at the inflow angle into the main pipe was provided.

At least one of the means (5), (6) and (8) described above is preferably a means for flowing or injecting a powder fluid. In addition, the first gas, the second gas,
The third gas and the first powder fluid, the second powder fluid, and the third powder fluid may be different from each other or of the same type.

[0012]

In the powder / gas mixing apparatus according to claim 1 of the present invention, (1) the inside of the main pipe through which the first gas or the first powder fluid flows by the means (1) to (3) described above. A swirling flow is generated in the tube by the second gas or the second powder fluid injected from the injection tube. Further, in the flow in which the swirling flow is generated, the swirling flow in the opposite direction is generated by the third gas or the third powder fluid injected from the stirring tube, so that the gas or the powder fluid is evenly distributed. It can be a dispersed mixed air stream. In particular, the powder in the first powder fluid, and / or the second powder fluid, and / or the third powder fluid flowing or injected in the main pipe is evenly dispersed in the gas. Therefore, the contact area with the gas can be increased.

Further, it is possible to mix 1 to 2 kinds of powder and 2 to 1 kind of gas, or 3 kinds of powder.
Further, since the mixing process is performed in a swirling flow, in order to increase the contact area of the powder fluid with the gas, a large amount of gas is not required, and even when a low concentration mixture is required,
Since it can be dealt with by changing the flow velocity, the device does not become large in scale, its production is difficult, and its cost is not increased.

In addition to the above-mentioned (1), the mixing apparatus for powder and gas according to claim 2 of the present invention is (2) a first device which has flowed through the main pipe by the above-mentioned means (4). Gas, or first
The second gas or the second powder fluid injected into the powder fluid is mixed with the first gas or the first powder fluid by its own turning force at the time of injection, and is injected from the stirring tube. First
Since the reverse swirling force is applied by the gas of (3) or the first (3) powder fluid, it can be evenly dispersed in the first gas or the first powder fluid. It is suitable for mixing the above-mentioned powder chemicals used for the above and air.

Further, the powder and gas mixing apparatus according to a third aspect of the present invention is constituted by the above means (5) to (8).
(3) The first gas or the first powder fluid flowing in the main pipe is
A swirl flow is generated by the stirring blade. The second gas or the second powder fluid is injected into the swirling first gas or the first powder fluid from the inflow pipe so as to further strengthen the swirling force or in the axial direction of the main pipe. As a result, both are promoted to be mixed in a swirling flow. Further, the second gas, or the second
On the downstream side of the injection point of the powder fluid, the third gas or the third powder fluid that generates a reverse swirl flow in the direction opposite to the swirl flow generated in the main pipe is injected into the main pipe, The gas or powder fluid in the main tube can be an evenly dispersed mixed air stream.

Further, the same action as the above-mentioned (1) and the effect by the action can be obtained.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the powder and gas mixing apparatus of the present invention will be described below with reference to the drawings. 1A and 1B are views showing a first embodiment of a powder and gas mixing apparatus of the present invention, FIG. 1A is a side view, and FIG. 1B is a view taken along the arrow A- shown in FIG. FIG.

In the figure, 1 is a main tube through which air 2 as a first gas flows, and 3 is a powder chemical as a second powder fluid,
The mixed flow 4 mixed with the air as the second gas is the main pipe 1
The injection pipe is connected to the main pipe 1 with a mounting angle such that a swirl flow is generated in the main pipe 1 when injected into the main pipe 1. That is, the injection pipe 3 is attached to the main pipe 1 by providing a component in the tangential direction of the outer peripheral surface of the main pipe 1, and is attached to the main pipe 1 with an inclination descending in the flow direction of the air 2 in the main pipe 1, and from the injection port into the main pipe 1. The injected mixed flow 4 generates a swirling flow that rotates in one direction inside the main pipe 1.

Further, 5 is a pressure header, and the pressure header 5 is provided with a nozzle 6 as a stir tube branching off. The nozzle 6 branched from the pressure header 5 is configured to inject air 7 as the third gas from the four outer circumferences of the main pipe 1 in the tangential direction of the outer circumference of the main pipe 1, and further, to inject the air 7 into the main pipe 1 from the nozzle 6. The generated flow of the air 7 causes a reverse swirl flow in the main pipe 1 in a direction opposite to the swirl flow generated on the upstream side. Such an outer circumference 4 of the main pipe 1
Nozzle 6 for generating a reverse swirl flow from the place into the main pipe 1.
Are provided at three locations in the flow direction of the main pipe 1.

As described above, in this embodiment, the main pipe 1 through which the air 2 as the first gas flows is connected to the main pipe 1 so as to generate a swirl flow, and the mixed flow 4 as the second powder 4 is formed. An injection pipe 3 for injecting into the main pipe 1, and a downstream side of the injection pipe 3,
Since the nozzle 6 as the stirring tube for injecting the air 7 as the third gas in the tangential direction of the main tube 1 is connected so as to generate the swirling flow in the direction opposite to the swirling direction generated by the injection of the mixed flow 4, Inside the main pipe 1, two swirling flows having different swirling directions are generated in the flow direction, and the powder chemical in the mixed flow 4 injected from the injection pipe 3 is the first gas and the third gas. As a result, it is possible to solve the problem that has occurred in the conventional mixing, that is, the chemical powder and air are unevenly dispersed by being evenly dispersed in the air 2 and 7.

Further, since the powder chemicals are mechanically mixed in the airs 2 and 7 by the generated swirling flow and reverse swirling flow, the powder chemicals can be mixed with the air without making the concentration extremely low. It can be evenly dispersed inside, the amount of air as a dispersion medium can be reduced, the apparatus does not have to be large-scaled, and the cost can be reduced.
Further, even when a low-efficiency dispersion medium is required, by changing the flow velocity in the main pipe 1, the injection pipe 3, and the nozzle 6, it is possible to cope with the device without increasing the scale.

In the above-mentioned embodiment, the dispersion of the powder chemical injected from the injection pipe 3 has been described, but the first powder fluid mixed with the first powder is caused to flow through the main pipe 1, and the injection pipe is injected into this. By injecting the second powder fluid in which the third powder is mixed from No. 3 and the third powder fluid in which the third powder is mixed from the nozzle 6, respectively, three different powders are obtained. It is also possible to mix them uniformly, and if different kinds of gas are used for the gases that respectively carry the three different powders, it is possible to mix the three different powders and the three different gases. That is, the present invention can be used for mixing one kind of powder and one kind of gas shown in the embodiment to mixing three kinds of powder and three kinds of gas.

Next, FIG. 2 is a view showing a second embodiment of the present invention, FIG. 2 (a) is a side view, FIG. 2 (b) is a sectional view taken along the line BB of FIG. 2 (a), FIG. 2C is a view CC of FIG. 2A.
It is sectional drawing.

As shown in the drawing, in the present embodiment, the first
The bend pipe 11 is used as the main pipe for flowing the air 2 as the gas, and the mixed flow 4 in which the powder chemical as the second powder fluid is mixed with the air as the second gas is provided in the curved portion of the bend pipe 11.
Is inserted into the bend pipe 11. The tip of the inflow pipe 12 may be arranged in the same direction as the bend pipe 11, but as in this embodiment, the inflow pipe 1
The mixed flow 4 flowing into the bend pipe 11 from 2 may be arranged so as to further accelerate the swirling flow by the stirring blade 13 described later in the bend pipe 11.

A stirring blade 13 is installed between the outer peripheral surface of the tip end of the inflow pipe 12 and the inner peripheral surface of the bend pipe 11 so that a swirling flow is generated in the two flows of air flowing in the bend pipe 11. ing. Further, the same nozzle 6 as that described in the first embodiment is provided on the downstream side of the inlet at the tip of the inflow pipe 12.
Is installed.

Since this embodiment is constructed as described above, in the flow of the air 2 flowing through the vent pipe 11, the stirring blade 13 swirls upstream of the position where the mixed flow 4 is injected into the bend pipe 11. A flow occurs. The mixed flow 4 is injected from the inflow pipe 12 into the flow of the air 2 in which the swirl flow is generated so as to further accelerate the swirl flow. As a result, the chemical powder in the mixed flow 4 is stirred by the flow of the air 2 and flows while being dispersed in the air flow 2.

Further, by generating a reverse swirl flow by the flow of the air 2 blown from the nozzle 6, a strong stirring force acts on the flow in the bend pipe 11,
The chemical powder in the air stream 2 can be further dispersed to have a large contact area with the air.

[0028]

As described above, according to the powder and gas mixing apparatus of the present invention, due to the constitutions set forth in the claims, (1) it is easy for local unevenness in powder concentration to occur. By imparting a swirling force to the powder-gas two-phase flow, the dispersion of the powder in the gas becomes more effective, the powder is evenly dispersed in the gas, and the powder is dispersed in the gas. The contact area can be increased. (2) Since the powder can be effectively mixed with the gas, the amount of the gas that disperses the powder can be reduced, so that the device required for the mixing can be downsized. . (3) It is possible to separate the powder transportation and the uniform dispersion of the powder in the gas, and it is possible to perform the high-concentration powder transportation and the low-concentration uniform dispersion of the powder in the air, which makes the device highly efficient. Can be targeted.

[Brief description of drawings]

1A and 1B are views showing a first embodiment of a powder and gas mixing apparatus according to the present invention, FIG. 1A being a side view and FIG.
It is an arrow AA sectional view shown in (a).

FIG. 2 is a view showing a second embodiment of the present invention, FIG. 2 (a) is a side view, FIG. 2 (b) is a sectional view taken along the line BB of FIG. 2 (a),
2C is a cross-sectional view taken along the line CC of FIG. 2A.

[Explanation of symbols]

 1,11 Main pipe 2 Air (flow) as first gas 3 Injection pipe 4 Mixed flow as second powder fluid 5 Pressure header 6 Nozzle as stirring pipe 7 Air (flow) 12 as third gas 12 Tube 13 Stirrer

Claims (3)

[Claims] 1. A main pipe for flowing a first powdery fluid containing a first gas or a first powder, and a second gas connected to the main pipe for generating a swirling flow and flowing in the main pipe, or An injection pipe for injecting a second powder fluid mixed with a second powder, and connected to the main pipe at a downstream side of a connection portion of the injection pipe,
A powder provided with an agitating tube for injecting a third powder fluid mixed with a third gas or a third powder for generating a reverse swirling flow in the main tube. And gas mixing equipment. 2. The powder-gas mixing apparatus according to claim 1, wherein the third gas or the third powder fluid is the same as the first gas or the first powder fluid. . 3. A main pipe for flowing a first powder fluid mixed with a first gas or a first powder, and a tip portion inserted into the main pipe to mix a second gas or a second powder. An inflow pipe for injecting the second powdered fluid into the main pipe, a stirring blade installed on the inner peripheral surface of the main pipe and the outer peripheral surface of the tip end portion of the inflow pipe, and generating a swirling flow in the main pipe; A third powder fluid, which is connected to the main pipe downstream of the inlet of the inflow pipe, generates a reverse swirl flow in the main pipe and flows a third gas or a third powder flowing in the main pipe, is injected. A mixing device for powder and gas, wherein the mixing device is provided with a stirring tube.