KR100657147B1 - Mixing Promotion Structure of Pollutant Reduction and Mixing Promotion Method Using The Same - Google Patents

Abstract

The present invention relates to a mixing facilitation structure for reducing pollutants and a method for promoting the mixing using the same. In order to improve the homogeneous mixing and mixing of the contaminant-reducing medium, for example, air, fuel, additives, and combustion gas, which is introduced to the purpose.

       The present invention is a plurality of injections such that the injection member for the homogeneous mixing of the pollutants generated during combustion on the inner surface of the furnace having a predetermined shape and shape is sprayed toward the center of the cross section of the furnace while being disposed downstream of the combustion zone The members are arranged in parallel in the main steam direction and are disposed at the corners of the furnace and at the center of each inner surface to be sprayed into the center of the furnace; Provided is a mixing facilitation structure for reducing pollutants, in which each of the plurality of spraying members arranged in multiple stages has different spraying intensities according to the penetration distance corresponding to the mixing region, and the medium for pollutant reduction is sprayed.

In addition, the mixing zone is formed differently according to the penetration distance for each injection member sprayed toward the center of the furnace section on the inner surface of the furnace, so that the contaminants generated during combustion and the medium for reducing air, exhaust gas, fuel and pollutants are homogeneously mixed. By doing so, a method for promoting mixing for reducing pollutants is provided.

Furnace, spray, strength, mixing, area, acceleration, pollution, abatement, incinerator

Description

Mixing Promotion Structure of Pollutant Reduction and Mixing Promotion Method Using The Same}             

1 is a schematic view showing a conventional general furnace.

2 is a view showing a conventional front injection method.

3 is a view showing a conventional counter injection method.

Figure 4a, b is applied to the conventional tangential combustion furnace, Figure 4a shows a corner injection method, Figure 4b is a view showing a central injection method.

5 is a view showing a conventional Rotating Over Fire Air (ROFA) central injection method.

Figure 6 is a perspective view showing the mixing promotion structure of the present invention in a tangential combustion furnace.

7a to c show different mixing zones according to the spraying strength of the spraying member according to the present invention, and 7a shows the mixing zone for high speed spraying.

Figure 7b shows the mixing zone for the medium velocity jet strength.

7C shows the mixing zone for slow injection strength.

8 is a view schematically showing the rotation of the spray member of the present invention.

9 is a view showing an example in which the injection member of the corner injection method and the central injection method of the present invention is used in combination.

<Explanation of symbols for the main parts of the drawings>

10: furnace 12: main combustion zone

14: supply piping 16, 18, 24, 26, 32, 40, 42, 44, 56: injection member

20,22,28,30,34: unmixed area 46,48,50: mixed area

52,54: fixed shaft

The present invention relates to a mixing facilitation structure for reducing pollutants and a method for promoting the mixing using the same. It is to improve the homogeneous mixing and mixing promoting medium, such as air, fuel, additives, and combustion gases to reduce the generation. In particular, by multiplying and spraying the multi-stage arrangement of the spraying members parallel to the main flow direction and the strength of the spraying speed according to the size and condition of the furnace, the overall homogeneous mixing can be induced, thereby improving the pollutant reduction efficiency. It would be.

In general, it is possible to reduce the pollutants generated during the combustion process by suppressing the reaction of generating pollutants through homogeneous mixing between the harmful pollutants generated during the first combustion process and the air, fuel, or the additive for reducing the pollutants. In particular, the process relates to a mixing process.

In general, when burning fossil fuels such as petroleum and coal, biomass fuels such as animal manure or plants, and recycling resources such as garbage, various pollutants are generated. Alternatively, the fuel may be reduced by using a multi-stage combustion method or by adding an additive.

Commonly used methods include Over Fire Air (abbreviated as OFA), (Rotating Over Fire Air (abbreviated as ROFA), Reburn, Ammonia (NH ₃ ) / Urea ((NH ₂ ) 2CO )

All the pollutant reduction methods listed above reduce the amount of pollutants generated by spraying the medium (eg air, fuel, additives) to the incinerator or the furnace through a separate space outside the main combustion zone. Exercising the function

1 is a view illustrating a structure in which air, fuel, or additives are injected through a separate space separated from the main combustion region 12 of the furnace 10 for reducing a conventional pollutant.

The OFA is a technology that promotes complete combustion by supplying combustion air to the furnace through a separate supply pipe 14 downstream of the main combustion region 12 (based on the ignition point). by inducing a fuel-rich combustion, the nitrogen component of air and fuel and delay the reaction with oxygen, lowering the temperature accordingly a technique for suppressing the generation of NO _X.

However, the air supplied through OFA is completely mixed with unburned gas or pollutants formed in the main combustion zone 12 to contaminate dust, soot (black matter formed by smoke or soot), unburned dust and carbon monoxide. The amount of material generated should be reduced, for example, when the mixing is not smooth, there is a problem in that the effect on reducing pollutants cannot be achieved.

2 and 3 are views illustrating a structure in which the injection members 16 and 18 are generally disposed in a wall combustion furnace, and the injection member 16 as the front injection type of FIG. 2 and the opposite injection type of FIG. 3. When 18) is installed, there is a problem that the unmixed regions 20 and 22 are not generated because they do not sufficiently penetrate to the center of the furnace 10 as shown in the drawing.

In order to solve the above problems, in order to generate a flow for turning, the spraying members 24 and 26 are arranged in the direction of the arrow shown in FIGS. 4A and 4B. There is a problem that the combustion efficiency and the pollutant reduction performance are deteriorated because unburned gas or unburned components remain in the center of the furnace 10 because it does not penetrate to the center where the regions 28 and 30 are generated.

On the other hand, ROFA, which is a furnace denitrification technology similar to OFA, is the same as OFA in that it supplies air downstream of the main combustion region 12 to promote complete combustion, but the injection method is different. The following describes the injection method for the ROFA.

The ROFA is a technique for reducing the generation amount of NO _x by further increasing the turbulence strength and rotational strength through the arrangement structure of the asymmetric injection member 32 as shown in Figure 5 attached. However, there is still a point that the unmixed region 34 is generated because the injected air flow does not sufficiently penetrate to the center of the furnace.

In order to promote mixing between the unburned gas or various contaminants in the unmixed region 34 and the medium supplied through the injection member 32, the penetration effect must be improved, and thus, the pipe for transporting air, fuel or additives. A separate boosting fan must be installed at the Therefore, when the boosting fan is installed, a problem occurs in that power consumption and installation cost increase.

The prior arts described above are mostly used to reduce contaminants due to insufficient mixing of air, fuel, or additives injected through the injection members 16, 18, 24, 26, and 32. It has a common problem of deterioration in efficiency.

The present invention has been invented to solve the above problems, contaminants introduced to reduce the generation of contaminants such as soot, unburned hydrocarbons, nitrogen oxides, sulfur oxides, mercury, dust generated in the incinerator and the furnace The purpose is to enable homogeneous mixing and mixing promotion with a reducing medium.

The present invention for achieving the above object, while the injection member for the homogeneous mixing of the contaminants generated during combustion on the inner surface of the furnace having a predetermined shape and shape for reducing the pollutants is disposed downstream of the combustion zone A plurality of injection members are arranged in multiple stages parallel to the main steam direction so as to be sprayed toward the center of the furnace, and are disposed at the corners of the furnace and at the centers of the respective inner surfaces to be injected into the center of the furnace; Each of the multi-stage spraying member has a technical characteristic in the mixing promoting structure for reducing the pollutants in which the medium for reducing pollutants is sprayed with different spraying intensity according to the penetration distance corresponding to the mixing zone.

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Pollutants and pollutants generated during combustion are formed by forming different penetration distances and mixing zones by spraying different pollutants with different spraying strengths on the inner surface of the furnace. There is a technical feature in the method of promoting mixing for reducing pollutants such that the reducing medium is homogeneously mixed.
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 6 is a perspective view showing the mixing promotion structure of the present invention in a tangential combustion furnace. 7A to 7C show a mixed area according to the intensity injected from the injection member, 7A shows a mixed area for high speed injection, FIG. 7B shows a mixed area for medium speed injection, and FIG. 7C shows a low speed. It shows the mixing zone for spraying.

Referring to the accompanying exemplary drawings, the injection members 40, 42, 44 for injecting air, fuel or additives downstream of the main combustion region are positioned at the center of each wall so as to face the center of the furnace 10, unlike the prior art. While having a vertically arranged multi-stage structure.

In addition, each injection member 40, 42, 44 positioned in each stage is different from each other in the spraying strength, and the mixed region (46, 48, 50) of the injection member 40, 42, 44 of each stage also By using different methods, homogeneous mixing and mixing promotion can be achieved. In the following, the mixing regions 46, 48, and 50 in charge of the injection members 40, 42, and 44 arranged in each stage will be described in detail.

The high speed jetting member 40 shown in FIG. 7A has a high speed jetting, and the jetting area is preferably smaller than the jetting area of the medium speed jetting to achieve high speed jetting, as shown in the drawing. The central portion of the furnace 10 is responsible for the intensive mixing region 46. In addition, a device such as a damper or a valve for controlling the flow rate may be further provided in the injection member 46 to control the injection speed and the injection flow rate.

The medium speed jetting member 42 shown in FIG. 7B is sprayed with the jetting strength between the high speed jetting and the low speed jetting described later, and the jetting area is slightly larger than the jetting area of the high speed jetting, so that By penetrating into the unmixed region except the center and the edge, it is responsible for the mixed region 48 for that portion. In addition, a device such as a damper or a valve for controlling the flow rate may be further provided in the injection member 42 to control the injection speed and the injection flow rate.

7C is a low-speed jet member 44 shown in the accompanying drawings, is sprayed with a weaker injection strength than the medium-speed jet, and expanded more than the medium-speed jet hole of the ejection area to penetrate into the unmixed region of the edge of the furnace 10, It is in charge of the mixing area 50 for that part. In addition, a device such as a damper or a valve for controlling the flow rate is further provided in the injection member 44 to control the injection speed and the injection flow rate.

Therefore, when the injection members 40, 42, and 44 shown in Figs. 7A, 7B, and 7C are combined and installed in one or multiple stages, the mixing regions 46 and 48 respectively responsible for the above-described operations are provided. , 50) are different from each other induces homogeneous mixing and mixing promotion, and thus can solve the poor mixing to improve the efficiency of pollutant reduction.

In addition, the spraying strength sprayed on the high speed jetting member 40, the medium speed jetting member 42, and the low speed jetting member 44 is variable in position so as to achieve homogeneous mixing according to the combustion conditions of the furnace 10 or the incinerator. The order shown in the drawings for each spraying intensity is merely for convenience of description, and is not limited to this arrangement order, and may be variously modified. Furthermore, by increasing the number of installation of the injection member it may be possible to further subdivide the injection strength.

In addition, the contaminant additive may be a gaseous, liquid, or powder phase, and the spraying method may be used by spraying the additive alone or by using a spray transfer medium such as air or exhaust gas.

On the other hand, the furnace 10 or the combustion apparatus that does not generate the swing flow in the main combustion region 12, the swing flow is required for the homogeneous mixing and mixing promoting by the swing, in this case, the accompanying drawings Figure 8 As shown in the figure, the vertical, horizontal fixed shafts 52 and 54 provided on the injection member 56 can be rotated in the up, down, left, and right directions, thereby allowing the flow of the injection member 56 to rotate. The occurrence of may induce homogeneous mixing and promotion of mixing.

As mentioned above, the injection member 56 is rotated in the up, down, left, and right directions as an example. The fixed members 52 and 54 may be connected to each other so that a link can be interlocked. Alternatively, the forward and reverse drive motors may be directly connected to the fixed shafts 52 and 54 to control rotation of the fixed shafts 52 and 54 according to the forward and reverse driving directions of the forward and reverse drive motors.

However, the mechanical configuration presented for the rotation of the injection member 56 as described above is just one example, and need not be limited or limited to such a structure. In the present invention, the injection member 56 is provided with a top, bottom, left, If you can turn to the right, you can use any mechanical device.

On the other hand, the accompanying drawings Figure 9 shows a preferred example that is applied to the central injection method of the present invention in addition to the conventional corner injection method, as shown in Figure 6 on each wall surface of the furnace 10 ( 40, 42, 44 may be arranged in multiple stages, or may be arranged in a single stage. However, the arrangement structure shown in the drawings is only one example of application, and need not be limited thereto. Anyone skilled in the art may have various modification arrangements. Modifications will not depart from the technical features of the invention.

As described above, in the present invention, in order to reduce contaminants generated during the incineration apparatus and the furnace combustion process, injection members for injecting air, fuel, or additives are arranged vertically or horizontally in one stage or multiple stages, and the spraying strength of each stage By variably distributing, induces homogeneous mixing and mixing promotion, and for this reason, there is an effect that can improve the efficiency for the reduction of contaminants.

In addition, it is also possible to expect economic effects because it does not require a power unit such as a boosting fan that must be additionally used to prevent mixing defects.

Claims (4)

Injecting members for the homogeneous mixing of contaminants generated during combustion on the inner surface of the furnace having a predetermined shape and shape with the medium for reducing pollutants are disposed downstream of the combustion zone while being sprayed toward the center of the cross section of the furnace. Arranged in multiple stages parallel to the main steam, being disposed at the corners of the furnace and at the center of each inner surface to be sprayed into the center of the furnace; Mixing acceleration structure for reducing pollutants, characterized in that the spraying medium is sprayed with a different spraying strength to each of the spraying member disposed in the multi-stage having different spraying intensity according to the penetration distance corresponding to the mixing zone.        The method of claim 1,        Mixing acceleration structure for reducing the pollutant, characterized in that the rotation is possible in the vertical, horizontal, fixed axis and the vertical fixed shaft provided in the injection member in the vertical direction. delete Pollutants and pollutants generated during combustion by forming different penetration distances and mixing zones by injecting different pollutant-reducing media with different spraying strengths for different spraying members sprayed on the inner surface of the furnace. A method for promoting mixing for reducing pollutants, characterized in that the reducing medium is homogeneously mixed.

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