JP2008151393A - Method and apparatus preventing incomplete combustion in incinerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and apparatus which prevents incomplete combustion in an incinerator capable of achieving complete combustion of waste regardless of the size of an internal capacity of a combustion chamber and the type of the furnace, and suppresses generation of carbon monoxide and dioxin. <P>SOLUTION: Combustible gas is provided to an upstream end periphery of an airflue, and it is burned by using remaining oxygen in the combustible gas by flame spread. The combustible gas is high pressure gas having adjusted to a pressure of 0.1-0.7 MPa and having a gross weight of less than one tenths of an exhaust gas amount. The combustible gas is injected into the combustion chamber so as to exceed a speed of 250 m/s, and generate turbulence energy generating flame propagation in a combustion gas flow in an air injection area periphery. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method and apparatus for preventing the generation of carbon monoxide (CO) and dioxins during combustion and completely incinerating waste in a furnace.

  The incinerator has an air supply port for supplying combustion air into the combustion chamber of the incinerator, but the air supplied from the air supply port simply provides oxygen for combustion. However, this alone makes it difficult to completely burn the waste in the furnace and generates smoke containing harmful substances such as carbon monoxide and nitrogen oxides.

  The inventor of the present application disclosed the following apparatus in Patent Document 1 prior to the present invention. In this apparatus, a nozzle having a large number of air injection ports on its peripheral surface is disposed in a thrust chamber located in the vicinity of the upstream end of the flue of the incinerator, and air is discharged from the nozzle outlet horizontally into the combustion chamber. By injecting in all directions, disturbance of pyrolysis gas (unburned gas) is promoted. Thereafter, the injected air increases the residence time of the incomplete combustion gas and promotes flame propagation in the thrust chamber to completely burn the waste in the incinerator.

In addition, the inventor disclosed the following invention in Patent Document 2. In the present invention, a rotatable nozzle is provided, and the sprayed air is scattered throughout the combustion chamber by the centrifugal force accompanying the rotation, causing disturbance of the pyrolysis gas.
Japanese Utility Model Publication No. 7-2719 Japanese Patent No. 3,312,223

  By the way, if the supply of combustion air is insufficient, incomplete combustion may occur and CO generated during combustion may increase. Further, if the supply of combustion air is excessive, the CO increases excessively as the combustion temperature decreases. Therefore, an appropriate amount of combustion air that suppresses the generation of CO must be supplied. An excessive supply of air also promotes the generation of CO.

  When the second combustion air is supplied into the flow path of the combustion air flow, it becomes difficult to mix the second combustion air and the combustion gas. Thus, the combustion temperature will be reduced by excess air and CO may be easily generated.

  The combustion gas contains unburned oxygen. It is therefore desirable to use this residual oxygen in the combustion gas itself to achieve complete combustion of the combustion gas. For this reason, in the conventional method, a turbulent flow is generated in the combustion gas flow by forming a convex portion on the combustion gas path or arranging a grid-like partition, and the turbulent energy Residual oxygen in the combustion gas is burned. However, the conventional method merely makes the combustion gas flow disorder to some extent, and it is not possible to generate a sufficient turbulent flow phenomenon that generates flame propagation in the flow path of the combustion gas.

  The inventor of the present invention can overcome the problems of the conventional combustion method. However, in this invention, it has been found that turbulent energy cannot always be obtained because only high-pressure air adjusted to a pressure of 0.03 to 0.5 MPa (for example) is jetted by the compressor. . In addition, the rotatable nozzle structure is complex and prone to failure.

  In addition, regarding the formation of many holes in the outer peripheral surface of the nozzle, the work process is complicated and difficult, and the hardness of the nozzle deteriorates. When the hole is provided at the tip of the nozzle and a large number of nozzles are provided, the nozzle is constantly exposed to a high temperature environment in the combustion chamber and the flue, so there is a possibility that the quality of the nozzle may be transformed or heat may be changed. Furthermore, with regard to the above-described invention, it was possible to prevent the generation of a significant amount of soot, but a method sufficient to achieve smokelessness of combustion, regardless of the type of furnace or the size of the furnace, It was clear that it was not a device. In particular, they have not been able to sufficiently prevent incomplete combustion occurring around the wall in the furnace.

  One of the objects of the present invention is to provide a method and apparatus for preventing incomplete combustion of an incinerator as follows. This method and apparatus is configured in a relatively simple configuration by turbulent combustion gas around the upstream end of the flue and burning the combustion gas by using residual oxygen in the combustion gas by flame propagation. Generation of oxygen oxide and dioxin can be suppressed, and complete combustion of waste can be efficiently achieved by combustion regardless of the internal capacity of the combustion chamber and the type of furnace.

  In addition, another object of the present invention is that the nozzle can be used stably for a long period of time, is not easily affected by heat that causes transformation or heat change, and cancels incomplete combustion that occurs around the furnace wall. It is an object of the present invention to provide a method and apparatus for preventing incomplete combustion of an incinerator.

  The present invention has the following configuration so as to achieve the above-described object and purpose.

  In claim 1, combustion air is supplied from an air supply port provided in a furnace wall of the combustion chamber, and high-pressure gas is supplied from at least two opposing points on the upstream end face of the flue disposed in the combustion chamber space. Injected to block the cross section of the flue. The high pressure gas is adjusted to a pressure of 0.1 to 0.7 MPa and is accelerated to have a total weight of less than one tenth of the exhaust gas volume and to exceed a speed of 250 m / s. This high pressure gas flow then generates turbulent energy that causes flame propagation in the combustion gas flow around the ejection region.

  The second aspect of the present invention is based on the method invention of the first aspect, and the injection nozzle portion used for the method is disposed at at least two opposing points on the upstream end wall of the flue. The said injection nozzle part has the main nozzle part from which a high pressure gas ejects, and the sub nozzle part comprised around the said main nozzle part. From the upper part of the main nozzle part, high-pressure gas pressurized from 0.1 MPa to 0.7 MPa and having a total weight of 1/10 or less of the amount of exhaust gas from the incinerator substantially blocks the cross section of the flue. In such a state, it is ejected at a speed accelerated to 250 m / s. Further, from the sub-nozzle part, a smaller amount of gas than the gas injected from the main path is generated in the vicinity of the upper part of the sub-nozzle part based on the high-pressure flow ejected from the upper part of the main nozzle part. It is ejected by applying pressure.

The apparatus of claim 6 is an apparatus for carrying out the method invention of claim 1. The apparatus is provided with an air supply port for supplying combustion air to the combustion chamber space, a plurality of injection nozzle portions, and a compressor connected to the injection nozzle portion by a pipe line. The said injection nozzle part is fixed to the furnace wall surface arrange | positioned at the upstream side surface opening end of a flue at at least two points which mutually oppose, and has a high pressure gas injection port. The injection nozzle portion is a high-pressure gas adjusted to a pressure of 0.1 to 0.7 MPa and having a total weight of less than one-tenth of the exhaust gas amount and accelerated to exceed a speed of 250 m / s, Injecting in a state of substantially blocking the cross section of the flue. The high-pressure gas flow generates turbulent energy so as to propagate a flame to the combustion gas flow around the injection region. The apparatus of claim 7 is an apparatus for carrying out the method invention of claim 1. The invention of item 6 is assumed. In this apparatus, an injection nozzle portion fixed at at least two points facing each other on the furnace wall surface is arranged at the upstream side open end of the flue so as to be configured at at least two positions. The said injection nozzle part has the main nozzle part which ejects high pressure gas, and the sub nozzle part comprised around the said main nozzle part. The main nozzle portion is a high-pressure gas pressurized to a pressure of 0.1 to 0.7 MPa and having a total weight of less than one-tenth of the amount of exhaust gas and accelerated to exceed a speed of 250 m / s. , And jetting in a state of substantially blocking the cross section of the flue. On the other hand, when the high-pressure air is ejected from the upper part of the main nozzle part, the sub-nozzle part is less than the air ejected from the main nozzle part due to the negative pressure generated in the adjacent space above the sub-nozzle part. A small amount of air is blown out.

The high-pressure gas used in the present invention is not limited to dry air as long as it imparts turbulent energy to the combustion gas flow. Water vapor is also included as a medium. The “combustion gas” referred to here includes an unburned gas flow and dust. The high-pressure gas is not intended to supply oxygen, but is intended to transmit turbulent energy to the combustion gas flow, so that it is supplied in an amount sufficient for primary combustion and secondary combustion. It is not necessary, and may be less than about 1/10 of the amount of exhaust gas from the incinerator. A preferable range for supply is about 1/20 to 1/30 of the amount of exhaust gas. When injecting from a plurality of locations, the total amount is limited to the same extent. In addition, the suitable range of the pressure of a high pressure gas is 0.1 MPa-0.7 MPa (1.0-7.0 kg / cm < ² >). If the pressure is less than 0.1 MPa, carbon monoxide cannot be reduced, and if the pressure exceeds 0.7 MPa, the pressure is too high. For example, it is difficult to obtain such high-pressure outside air with pressurized air supplied by a blower, and it depends on the compressor. The pressure value is adjusted and selected to an optimum value according to the incinerator capacity and the flue diameter.

  The injection speed is adjusted by the pressure of the high pressure gas supply source, the diameter of the injection hole, and the gas temperature. If the gas temperature is high even with the same pressure and the same diameter, the injection speed increases accordingly. When injected at a speed of 250 m / s or more, relatively large turbulent energy is generated in the combustion gas flow, which becomes an energy source that promotes combustion by residual oxygen in the combustion gas and suppresses the generation of CO. It was found that the combustion was performed. When it is less than 250 m / s, it is difficult to generate sufficient turbulent energy. The temperature of the injection gas is not particularly limited, but it is generally desirable to exceed 100 ° C. in relation to the injection speed.

  As for the heating of the injection gas, the heat generated in the combustion path is effectively utilized by fixing a high-pressure gas supply line to the furnace wall or using a heat exchanger that uses the heat of exhaust gas on the combustion path. be able to.

  In order to cause turbulent flow, the injection nozzle part is provided on the flue wall, and the front part of the nozzle is exposed to the flue gas. The high-pressure gas is injected from the injection hole provided in the outer periphery of the nozzle and / or from the small-diameter path formed in the axial direction of the nozzle in a specified direction (direction in which the flue cross section is blocked). The nozzle inserted into the combustion gas flow itself becomes one of the factors that cause turbulence in the combustion gas flow.

  A plurality of injection nozzles are provided on the flue wall so as to face each other. More than two sets of injection nozzles may be provided, and high-pressure gas may be injected spirally into the flue by adjusting the angle of the injection ports.

  The effects of the present invention are as follows.

  The present invention allows the combustion gas to stay in the upstream of the flue and can be vigorously stirred at the same time, and effectively decomposes the unburned gas by using the residual oxygen of the combustion gas without lowering the temperature. In addition, since turbulent energy for propagating flame in the combustion gas is generated by a very small amount of high-pressure gas injected into the flue, generation of carbon monoxide can be suppressed. By suppressing the amount of carbon monoxide, the present invention can also suppress the generation of dioxins.

  Even if air is used as the highly compressed gas, only a very small amount of air is used compared to the amount of exhaust gas, and therefore the combustion temperature does not become too high.

  The device of the present invention consists only of an injection nozzle section (without any moving parts), a compressor, and a pipeline. Therefore, the apparatus of the present invention is very simple and easy to maintain. This device can be manufactured at a relatively low cost.

  Further, in the case where the present invention is configured such that the injection nozzle portion has a main nozzle portion and a sub nozzle portion, not only does it contribute to complete combustion of the combustion gas flow passing around the flue wall surface, but also the sub nozzle portion. It becomes possible to contribute to prevention of thermal fatigue and thermal change of the injection nozzle part in quality as much as possible by the cooling action of the air flow passing through the nozzle part.

  Hereinafter, the present invention will be described in detail based on illustrated embodiments. FIG. 1 is a conceptual configuration diagram of a stalker type incinerator to which a method according to an embodiment of the present invention is applied. Reference numeral 1 in the figure denotes a combustion chamber in the incinerator. The combustion and drying stalker 2 is disposed at the bottom of the combustion chamber and extends downward. In addition, the incinerator 2 includes a waste inlet 3 on one side of the combustion chamber (left side in FIG. 1). Many supply ports, that is, holes 4 are formed in the furnace wall forming the upper space 1a of the combustion chamber. The supply port 4 is connected to an external blower 5 via a pipeline, and supplies combustion oxygen to the combustion chamber upper space 1a at a low pressure.

  Reference numeral 6 denotes a flue that communicates with the upper space 1 to guide the combustion gas to the outside of the combustion chamber. An injection nozzle portion 7 for high-pressure air injection is suspended from the side wall of the upstream end portion of the flue 6.

  The injection nozzle portion 7 is made of a heat resistant material such as a heat resistant steel, a heat resistant alloy, or a ceramic. As shown in FIGS. 2 and 3, with respect to the nozzle portion 7, the base end portion 7 a is fixed to a mounting hole provided in the side wall of the flue, and the tip end portion 7 b is an internal space at the upstream end portion of the flue. Exposed to. The injection nozzle section main body is provided with a large number of small-diameter injection orifices (for example, a diameter of about 2 mm, not shown) for high-pressure air injection.

  In this embodiment, the jet nozzles 7 are arranged in two rows in the longitudinal direction of the flue (see FIGS. 1 and 2), and four stages are provided in the height direction on the side wall of the flue (FIG. 1). And FIG. 3). And these are arrange | positioned so that it may mutually oppose on both side walls. The base end of each injection nozzle part is connected to the upper part of the air supply pipe.

Reference numeral 8 denotes a compressor, which supplies high-pressure air to the injection nozzle unit 7 through a pipe line at a predetermined pressure (5 kg / cm ² ). The amount of air injected from the injection nozzle unit 7 is adjusted to 1/10 or less of the total weight of the exhaust gas from the incinerator, and is adjusted to 1/20 (5%) in this embodiment.

  The opening / closing valve 9 and the heating means 10 are interposed in the middle of the pipeline. The heating means 10 may be one that uses the combustion heat of the incinerator as a heat source, or another independent heat source. The compressed air is heated to around 300 degrees C by passing through the heating means 10. The heated compressed air obtains a speed of about 300 m / s when passing through a small-diameter passage provided in the injection nozzle part, and is jetted vigorously from the injection port at the upper part of the injection nozzle part.

  Reference numeral 11 denotes a temperature measurement sensor provided on the downstream end side of the flue wall from the mounting position of the injection nozzle portion. This sensor detects the temperature of the inner surface of the flue arranged slightly downstream from the position of the injection nozzle portion 7.

A carbon monoxide measurement sensor 12 is installed in a flue located behind the temperature measurement sensor 11 and measures the amount of carbon monoxide contained in the gas passing therethrough. Values measured by these sensors 11 and 12 are input to a control unit (not shown) of a control unit 13 provided in the middle of a pipe line connecting the compressor 8 and the injection nozzle unit 6. In the control unit, an appropriate temperature and an allowable carbon monoxide amount in a combustion state where smoke is not generated or in a combustion state close to this are recorded as set values. The control unit compares the set value with the above-described measurement value, and injects and stops high-pressure air. That is, normally, for example, in order to prevent the generation of dioxins, combustion at a high temperature of 800 ° C. or higher is required, so it is desirable to set the temperature to a value higher than this. Further, since the amount of carbon monoxide generated is said to be proportional to the amount of dioxin generated, it is desirable to set the set value as low as possible. In addition, by changing the carbon monoxide measurement sensor to the exhaust gas measurement sensor, not only CO contained in the exhaust gas but also O ₂ , CO ₂ , NO _x, and SO ₂ can be measured.

  The measurement results of the measurement sensors 11 and 12 are input to the control unit 13 as output signals. The control unit 13 analyzes the output signals from the measurement sensors 11 and 12, adjusts the opening of the on-off valve 9 as necessary, starts the supply of compressed air, and automatically adjusts the supply amount. For example, when the measured value of the oxygen monoxide measuring sensor 12 is higher than a predetermined value, the valve opening is increased.

  In this embodiment, when the compressor 8 is operated by a signal from the control unit 13 and high pressure air is injected from all the injection nozzles, the high pressure air is a small amount but a double air curtain. Therefore, the cross section 6A (see FIG. 2) upstream of the flue 6 is almost blocked.

  Therefore, the combustion gas entering the flue from the upper space of the combustion chamber causes a strong flame disturbance in this cross section 6A, and the unburned portion in the combustion gas is effectively thermally decomposed by a strong stirring action over a long period of time. Is done. Thus, almost complete combustion conditions at high temperatures are achieved.

  Since the high pressure air stream does not completely enclose the flue cross section 6A, the burned gas is guided downstream of the flue through the gap of the high pressure air stream.

  The amount of injected air is about 5% of the amount of exhaust gas, which is very small compared to the amount of air supplied for combustion. As a result, the high pressure air is not used for combustion itself, but simply perturbs the gas flow vigorously and achieves the action of pyrolyzing the unburned gas portion in the combustion gas by using the residual oxygen of the combustion gas. .

Experimental Example The inventor of the present application carried out the present invention using an incinerator that incinerates 1500 kg of waste oil every hour under the following conditions.

High pressure air injection nozzle: 16 nozzles are illustrated in FIGS.
Placed in position.

Total injection amount of high-pressure air: about 1,100m ³ / h
Pressure of high pressure air: 0.5 MPa
High-pressure air injection speed: about 300m / sec (average)
Amount of combustion gas: about 17,000 Nm ³ / h
(Same amount as supply of combustion oxygen)
From the time 9:15 to the time 16:45 when the in-furnace temperature is about 900 ° C. from the start of combustion, (1) carbon monoxide concentration, (2) oxygen concentration, and (3) temperature are continuous. Measured.

  The high-pressure air was injected at a pressure lower than the predetermined pressure (0.05 MPa) of the present invention until 10:25. This high-pressure air is injected at a pressure of 0.4 MPa from 10:25 to 12:55, injected at a pressure of 0.5 MPa from 12:55 to 15:50, and then injected again at a pressure of 0.4 MPa. Is done.

  The experimental results of the experiment are shown in FIG.

  The carbon monoxide value is explained by the instantaneous value and the 12% equivalent value in FIG. By referring to the steps (A) to (I) in FIG. 3, the following conclusion can be made.

(A) 9: 15-10: 25
The furnace temperature was maintained at about 900 ° C., and the oxygen concentration averaged 7.63%. The carbon monoxide concentration was over 1000 ppm at the highest value and 150 ppm at the lowest value. The values shown are widely dispersed. The carbon monoxide concentration value was 361.2 ppm on average when converted to 12%.

  From this, it can be seen that during this time, although the combustion temperature is stable, the combustion quality becomes unstable, and air injection at a pressure lower than a predetermined pressure is not effective for removing carbon monoxide. However, the amount of air injected is about 6% of the amount of combustion air, and the oxygen concentration itself did not change from the oxygen concentration before injection (about 7.8%).

(B) 10: 25-12: 55 (injecting high pressure air at 0.4 MPa)
The furnace temperature was still maintained at about 900 ° C., and the oxygen concentration was 7.75% on average, which was almost the same as the stage (A). The carbon monoxide concentration dropped rapidly and reached an average of 223.4 ppm. This indicates that incomplete combustion has been eliminated. In addition, since the furnace temperature did not decrease and the oxygen concentration did not change, it can be seen that the injected air itself did not contribute to combustion.

(C) to (E) 12:55 to 14:20 (injecting high pressure air at 0.5 MPa)
The furnace temperature was maintained at 900 ° C., and no adverse effect of high-pressure air injection occurred. The oxygen concentration was not changed, and it was 7.73 in (Step C), 7.61 in (Step D), and 7.74 in (Step E), and showed an original value on average. The carbon monoxide concentration decreased to some extent, and average values were 149.0 ppm, 120.7 ppm, and 113.6 ppm, but this was a slow change.

(F) to (I)
Similarly, the furnace temperature was maintained at 900 ° C., and no adverse effects such as cooling by high-pressure air injection occurred. The oxygen concentration of each step was 7.84%, 7.93%, and 7.89% on average, respectively. The carbon monoxide concentration was maintained at a low value in each step and averaged 108.9 ppm, 103.1 ppm, 115.1 ppm, and 110.4 ppm, and was in a stable state. This concentration is almost unchanged from that of the conventional step. In particular, in step (I), the pressure value of the high-pressure air was returned to 0.4 MPa, but the oxygen monoxide concentration did not increase.

  When combustion further continues from the state of step (I) and the amount of carbon monoxide increases, the pressure of the high-pressure air is determined based on the signal from the control unit as in the transition from step (B) to step (C). To raise. Therefore, a strong disturbance is generated by the combustion gas passing through the flue, and the amount of carbon monoxide is reduced.

  When the amount of soot particles was measured, it was 0.051 g / mN when this device was not used, and 0.019 g / mN when this device was used, and soot particles were reduced to about one third. Declined. This indicates that incomplete combustion is the result of improvement. The measurement of the completely burnt smoke particles was performed according to the cylindrical filtration method (JIS Z8808).

  As described above, the present invention can realize a smokeless incinerator by suppressing the amount of smoke particles.

  From the measurement results described above, it is possible to effectively reduce carbon monoxide and remove soot particles by injecting an extremely small amount of air having a predetermined pressure into the flue of the incinerator.

  5 and 6 are cross-sectional views showing the main parts of an apparatus according to another embodiment of the present invention. The present embodiment shows a case where the present invention is applied to an incinerator having a vertically long flue above the combustion chamber. The injection nozzle part 27 is horizontally fixed to the upstream end wall of the flue 26, and has a cross shape along the wall of the flue as shown in FIG. The injection port is formed not only on the front surface of the nozzle but also on the outer periphery of the nozzle.

  According to the present embodiment, collisions between high-pressure air flows injected from a large number of injection ports and collisions between high-pressure air flows and combustion gas flows frequently occur. However, turbulence occurs in a wide range of directions.

  When the four injection nozzle parts configured in a cross shape are arranged in two stages above and below the flue, and the phase of the upper injection nozzle part is shifted by 45 degrees with respect to the lower injection nozzle, Or high pressure air flow and combustion gas flow will occur. These collisions are more effective due to the generation of turbulent energy.

  In this embodiment, the amount of carbon monoxide and the amount of smoke particles in the combustion gas can be reduced by the same operation as that described in the previous embodiment.

  FIG. 7 is a schematic sectional view showing an injection nozzle portion according to still another embodiment of the present invention.

  At least one pair of injection nozzle parts are attached so as to face the wall of the open end part arranged upstream of the flue, as in the above-described embodiment. An air supply port for supplying combustion air to the combustion chamber is provided in the furnace wall.

  The injection nozzle portion includes a main nozzle portion that is formed so as to pass through the center of the nozzle and through which high-pressure gas passes, and a sub nozzle portion that is disposed around the main nozzle portion. The sub-nozzle portion may be formed as an annular passage surrounding the main nozzle portion when arranged so as to surround the circumference of the main nozzle portion, or spaced in the circumferential direction around the main nozzle portion. Alternatively, it may be formed as a plurality of small diameter passages.

  The rear end of the main nozzle part is connected to the compressor by a pipe line. The high-pressure gas propagated from the upper part of the main nozzle part is pressurized from 0.1 MPa to 0.7 MPa, and adjusted to a total weight of 1/10 or less of the exhaust gas amount from the incinerator. The high-pressure gas is ejected at a speed exceeding 250 m / s while substantially blocking the cross section of the flue.

  On the other hand, when the high pressure air is ejected from the upper part of the main nozzle part, the sub nozzle part ejects a smaller amount of air than the air ejected from the main nozzle part due to the negative pressure generated in the space adjacent to the upper part of the sub nozzle part. To do. The air ejected by the sub-nozzle part may be obtained directly from the outside of the incinerator or may be slightly pressurized air.

  The air ejected from the main nozzle section and the sub nozzle section generates energy that generates flame propagation in the combustion gas flow passing around the air ejection area, and complete combustion of the unburned gas as in the previous embodiment. To achieve.

  The air jetted by the sub nozzle part not only stirs the gas flow passing along the inner wall of the furnace, which is difficult to stir by the high pressure air of the main nozzle part, but also serves as combustion air for the gas flow. Can fulfill. Therefore, the air from the sub nozzle part can contribute to achieving complete combustion of the unburned gas.

  Further, the air passing through the sub nozzle part can cool the injection nozzle part body so as to prevent thermal fatigue and thermal destruction of the injection nozzle part.

  The present invention is applicable not only to a stalker combustion type incinerator but also to various incinerators such as a horizontal fixed bed type incinerator and a dry distillation gasification incinerator. In each incinerator, the high-pressure air injection nozzle portion is set at a position and number where high-pressure gas can be injected so as to substantially block the upstream cross section of the flue.

It is the figure which demonstrated notionally the structure of the stalker type incinerator applied to the method concerning one Example of this invention. It is sectional drawing of the II-II line of FIG. It is sectional drawing of the III-III line | wire of FIG. It is a figure which shows the experimental result of the apparatus of FIG. It is a figure which shows the vertical sectional view of the principal part of the incinerator which concerns on another Example of this invention. It is a figure which shows the top view of FIG. It is a schematic sectional drawing which shows the injection nozzle part which concerns on another Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Combustion chamber 3 Input port 4 Air supply port 5 Blower 6,26 Flue 7,27,37 Injection nozzle part 8 Compressor 12 Carbon monoxide measurement sensor 37a Main nozzle part 37b Sub nozzle part

Claims (7)

  While supplying combustion air from an air supply port provided in the furnace wall of the combustion chamber, pressure from 0.1 to 0.7 MPa from at least two opposing points at the upstream end of the flue adjacent to the combustion chamber space And high-pressure gas having a total weight of less than one-tenth of the exhaust gas amount and accelerated so as to exceed a speed of 250 m / s, is injected in a state of substantially blocking the cross section of the flue, A method for preventing incomplete combustion of an incinerator, characterized in that turbulent energy that generates flame propagation in a combustion gas flow around an air ejection region is generated by the high-pressure gas.   At the same time as supplying combustion air from an air supply port provided in the furnace wall of the combustion chamber, an injection nozzle portion is provided at at least two opposing points of the upstream end of the flue adjacent to the combustion chamber space, Is provided with a main nozzle portion from which high-pressure gas is ejected and a sub nozzle portion configured around the main nozzle portion, and the main nozzle portion is pressurized from 0.1 MPa to 0.7 MPa, and High-pressure gas having a total weight of 1/10 or less of the amount of exhaust gas from the incinerator is ejected at a speed accelerated to 250 m / s so as to substantially block the cross section of the flue, and the sub-nozzle section From, a smaller amount of gas than the gas injected from the main path is ejected under the pressure or negative pressure generated around the upper portion of the sub nozzle portion based on the high pressure flow ejected from the upper portion of the main nozzle portion. And these high pressure gases Therefore, incomplete combustion method for preventing incinerator and generates a turbulence energy to generate a flame propagation in the combustion gas stream of ambient air ejection area.   3. The method for preventing incomplete combustion of an incinerator according to claim 1, wherein the high-pressure gas is air heated using heat generated by combustion in the incinerator.   3. The method for preventing incomplete combustion of an incinerator according to claim 2, wherein the injection points of the plurality of groups of high-pressure air extend in the longitudinal direction of the flue and form a plurality of stages.   The method of preventing incomplete combustion of an incinerator according to claim 1 or 2, wherein the high-pressure gas is spirally injected into the flue from a plurality of points. An air supply port for supplying combustion air to the combustion chamber space;
A plurality of injection nozzles;
A compressor connected to the injection nozzle part by a pipe line,
The injection nozzle part is fixed to at least two points facing each other on the furnace wall surface arranged at the upstream side opening end of the flue and has a high-pressure gas injection port,
The injection nozzle portion is a high-pressure gas adjusted to a pressure of 0.1 to 0.7 MPa and having a total weight of less than one-tenth of the exhaust gas amount and accelerated to exceed a speed of 250 m / s, Injecting in a state of substantially blocking the cross section of the flue,
The incomplete combustion prevention apparatus for an incinerator, wherein the high-pressure gas flow generates turbulent energy so that a flame is propagated to the combustion gas flow around the injection region. An air supply port for supplying combustion air to the combustion chamber space;
A plurality of injection nozzles;
A compressor connected to the injection nozzle part by a pipe line,
The injection nozzle portion is fixed to at least two points facing each other on the furnace wall surface, and is arranged at the upstream side opening end of the flue so as to be configured in at least two positions,
The injection nozzle part has a main nozzle part for injecting the high-pressure gas, and a sub nozzle part configured around the main nozzle part,
The main nozzle portion is a high-pressure gas pressurized to a pressure of 0.1 to 0.7 MPa and having a total weight of less than one-tenth of the amount of exhaust gas and accelerated to exceed a speed of 250 m / s. , Jetting in a state that almost obstructs the cross section of the flue,
When the high pressure air is ejected from the upper part of the main nozzle part, the sub nozzle part has a smaller amount than the air ejected from the main nozzle part due to the negative pressure generated in the adjacent space above the sub nozzle part. An incomplete combustion prevention apparatus for an incinerator characterized by ejecting air.

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