KR102516434B1 - Combustion Device Improves FGR Efficiency - Google Patents

Abstract

The present invention relates to a combustion device that improves FGR efficiency by improving circulation amount to improve FGR efficiency, and includes an inlet for inputting incinerated materials, a moving part, a combustion chamber, a combustion means, and an outlet for discharging burned ash. , It consists of a gas outlet, a circulation part, and a bypass part for circulating exhaust gas in case of a problem with the circulation part. In this case, the bypass damper 92 of the bypass part is opened to improve the circulation of the exhaust gas, thereby improving the FGR efficiency, as well as improving the FGR efficiency by continuously incinerating the combustion device to improve workability It is about.

Description

Combustion Device Improves FGR Efficiency}

The present invention relates to a combustion device with improved FGR efficiency to increase FGR efficiency by improving circulation amount.

In the case of conventional burners that generally use air as an oxidizing agent, when the temperature is measured along the central axis of the burner, a high-temperature region of nearly 2000K exists, and nitrogen oxides (NOx) are concentrated and very rapidly (milli-second) in this high-temperature region. second range) is generated, so lowering this high-temperature region is a very important method to realize low NOx combustion.

In addition, in recent years, in order to increase energy efficiency, a method of preheating air by recovering heat from combustion gas using a heat exchanger is used. It rises. Therefore, there is a need for a technique to prevent the maximum temperature of the flame zone from increasing even when the air is preheated.

In addition, when the concentration of oxygen is as high as 7% in a conventional combustion method, when air is preheated to 1200K and air is preheated to 1600K, the maximum temperature of the flame rises significantly, resulting in a large increase in the production of NOx, If the concentration is lowered, even if the air is preheated to 1600K, the maximum temperature of the flame is significantly lowered, and at the same time, the temperature of the lower part rises, showing a tendency to level the overall temperature.

Therefore, in recent years, development of realizing ultra-low NOx combustion using this method has been actively progressed. As such, in order to lower the oxygen concentration, it is common to use a method of returning the combustion gas after the fuel is burned and mixing it with the air stream. am.

However, in the case of recirculating the combustion gas after cooling, the area where the flame is stabilized is greatly narrowed, and if the amount of the combustion gas being recycled is increased, the flame becomes unstable or goes out. while the combustion gases must be recirculated.

That is, MILD combustion (Moderate and Intense Low oxygen Dilution) that maintains a stable flame by heating the air for combustion above the ignition temperature of the fuel, recirculating, mixing, and diluting the combustion gas to lower the oxygen concentration and maintain a high temperature at the same time. method should be used.

This MILD combustion method is called by various names. In Japan, where the development is advanced, a heat exchanger is used to recirculate the combustion gas and increase the temperature of the air at the same time. In order to raise the temperature above ℃, it is impossible with a general heat exchanger, so a heat storage regenerative type heat exchanger must be used, as well as a four-way valve that can withstand high temperatures in order to allow high-temperature combustion gas and air to flow alternately through ceramic heat storage materials. (4-way switching valve) has to be used, so the device is complicated and the price is expensive.

In addition, as a method of attracting high-temperature combustion gas to the classification of air in a low-emission combustion device for simultaneously reducing carbon monoxide (CO) and nitrogen oxides (NOx), it is common to use a venturi-type mixing pipe combined with an air nozzle. In this method, the center of the air nozzle and the venturi mixing pipe must be combined in a straight line, and the length of the venturi mixing pipe must be secured to generate negative pressure for attracting high-temperature combustion gas. There was a problem in that the wall thickness of the combustion chamber became thick, and as such, when the wall of the combustion chamber becomes thick, the width of the entire combustion chamber becomes larger along with the passage and width through which the high-temperature combustion gas flows, and the installation area must be increased, so the cost increases. There were also problems that acted as a factor.

Therefore, in order to solve this problem, a "low-pollution combustion device using a high-temperature FGR with Coanda effect nozzles" such as Patent Registration No. 10-1289411 (hereinafter referred to as Patent Document 1') was developed.

(Patent Document 1) KR10-1289411 B1 Low-pollution combustion apparatus using high-temperature FGR with Coanda effect nozzle applied

However, in Patent Document 1, a low-emission combustion device using a high-temperature FGR to which a conventional Coanda effect nozzle is applied, the air supplied through the Coanda nozzle and the high-temperature combustion gas attracted from the discharge unit due to the supply of the air Since it is supplied to the combustion chamber in an unmixed state from the bypass pipe, a heat spot occurs in a part where the air ratio is high, that is, the maximum temperature of the flame locally rises significantly, and in a part where the air ratio is too small, the amount of combustion gas There was a problem that the flame became unstable or the flame did not continue because there were many of them, and as a result, the production of NOx was not substantially reduced significantly.

Moreover, when the bypass pipe is clogged with flying materials, the amount of circulation is reduced, resulting in a decrease in FGR efficiency.

In order to solve the above problems, the combustion device with improved FGR efficiency according to the present invention monitors whether the circulation unit for circulating exhaust gas and fly products is normally operated, and then bypasses if normal operation is not performed. The negative bypass damper is opened to improve the circulation of exhaust gas, thereby improving FGR efficiency, as well as providing a combustion device with improved FGR efficiency that can improve workability by continuously performing incineration work. there is.

In the present invention, after monitoring whether or not the circulation unit for circulating exhaust gas and fly products operates normally, if the normal operation does not occur, the bypass damper 92 of the bypass unit is opened to improve the circulation of exhaust gas It is a useful invention that not only improves the FGR efficiency by doing so, but also improves workability by continuously performing the incineration operation.

1 is a schematic diagram showing a combustion device with improved FGR efficiency according to the present invention.

Hereinafter, looking at the configuration of the present invention in more detail using the accompanying drawings as follows.

The present invention is to incinerate the incineration material, and as shown in FIG. 1, an inlet 10 for injecting the incineration material is formed.

Although not shown in detail in the drawings, the inlet 10 may have a configuration capable of injecting incinerated materials by a driving body, and the fire generated during incineration of incinerated materials is transmitted to the outside through the inlet 10. Means for preventing may be further included.

Next, the moving unit 20 is configured to move the incinerated material introduced through the inlet 10.

More specifically, it is a configuration for moving the incinerated material within the combustion chamber 30 for incinerating the incinerated material.

Although the moving unit 20 is not particularly limited, it may be formed in a stepped shape so that incinerated ashes are stacked in stages and agitated.

In addition, the above-described combustion chamber 30 has a first combustion chamber 31 in which incinerated materials are moved by the moving unit 20, and a second combustion chamber 32 is formed above the first combustion chamber 31. and a third combustion chamber 33 formed by the second combustion chamber 32 and the partition wall W.

Here, the first combustion chamber 31 is a space for incinerating incineration materials, and the second combustion chamber 32 is a space for burning fly products and exhaust gas generated in the process of incineration of incineration materials in the first combustion chamber 31. The third combustion chamber 33 is partitioned from the second combustion chamber 32 by a partition wall W to prevent exhaust gas that has not been completely burned from being discharged.

Next, the combustion means 40 is formed in the combustion chamber 10 to incinerate the incinerated material, specifically, the first burner 41 and the second combustion chamber formed in the first combustion chamber 31 ( 32) and a second burner 42 formed thereon.

Next, the outlet 50 is a configuration formed at the end of the moving unit 20, and a configuration for discharging ash generated when the incineration process is completed to the outside, and detailed description thereof will be omitted.

Next, the gas outlet 60 is formed on one side of the third combustion chamber 33 constituting the combustion chamber 30 to discharge the combustion gas generated during incineration of the incinerator in the combustion chamber 30 to the outside. It is configured.

Meanwhile, in the present invention, a circulation unit 70 is formed.

The circulation unit 70 connects the third combustion chamber 33 and the first combustion chamber 31 so that the exhaust gas of the third combustion chamber 33 constituting the combustion chamber 30 can be supplied to the first combustion chamber 31. A circulation tube 71 is formed, and within the circulation tube 71, a circulation tube pressure measuring unit 72 for measuring the pressure of the circulation tube 71 and a circulation tube temperature measurement for measuring the temperature in the circulation tube 71 It may include a spray nozzle 74 formed at an end of the portion 73 and the circulation pipe 71 to discharge exhaust gas into the first combustion chamber 31 .

In particular, the circulation pipe 71 may further include a damper 75 for opening and closing the circulation pipe 71 .

Next, the combustion blower 80 is connected to the circulation pipe 71 constituting the circulation unit 70 so that external air together with the exhaust gas can be supplied to the first combustion chamber 31 from the circulation unit 70. A CGR nozzle N may be further included between the combustion blower 80 and the circulation pipe 71 of the circulation unit 70 to supply a large amount of air.

Next, the bypass unit 90 is branched from the circulation pipe 71 of the circulation unit 70 to move the exhaust gas from the third combustion chamber 33 to the first combustion chamber 31 .

Specifically, the bypass part 90 is branched from the circulation pipe 71 after the CGR nozzle N formed in the circulation pipe 71 of the circulation part 70, and one side goes to the first combustion chamber 31. It consists of a bypass pipe 91 configured to be connected and a bypass damper 92 formed between the bypass pipe 91 and the circulation pipe 71.

Looking at the operational effect of the combustion device having improved FGR efficiency according to the present invention having the above configuration is as follows.

First, in the operation of the combustion device 100 with improved FGR efficiency according to the present invention, when incinerated materials are input through the inlet 10, the incinerated materials are moved step by step through the moving unit 20 formed in the form of stairs, Incineration is performed by the first burner 41 of the combustion means 40 formed in the first combustion chamber 31 constituting the combustion chamber 30 .

As described above, the incinerated material moving through the moving unit 20 is burned in the first combustion chamber 31 and discharged to the outside through the outlet 50.

On the other hand, when the incineration material is incinerated by the first burner 41, fly products and exhaust gas are generated. The movement is made to the combustion chamber 32, and at this time, the second burner 42 of the combustion means 40 is formed in the second combustion chamber 32, so that the exhaust gas and the fly products are burned again.

As described above, exhaust gas and flying products remaining after combustion in the second combustion chamber 32 are moved to the third combustion chamber 33, which is a space partitioned by the second combustion chamber 32 and the partition wall W, at this time The second and third combustion chambers 32 and 33 partitioned by the partition wall W are formed in a ∩ shape to allow the exhaust gas to move, so that the first and second combustion chambers 31 and 32 constituting the combustion chamber 110 The residence time of the exhaust gas is increased in the exhaust gas, which is induced to be completely burned, so that almost no carbon dioxide (CO ₂ ) remains in the exhaust gas discharged through the gas outlet 60.

On the other hand, the exhaust gas and fly products induced into the third combustion chamber 33 are not directly discharged to the gas outlet 60, but are passed through the circulation unit 70, the combustion blower 80, and the CGR nozzle N to the combustion chamber ( 30) is circulated to the first combustion chamber 31 constituting the combustion chamber, thereby reducing the production of NOx and carbon dioxide (CO ₂ ).

That is, the circulation unit 70 recycles exhaust gas and flying products along with external air to the first combustion chamber 31 through the circulation pipe 71 by the combustion blower 80 and the CGR nozzle N. In the first and second combustion chambers 31 and 32, combustion of exhaust gas and fly products can be performed along with incineration of incinerated materials, and furthermore, evenly supplied by the injection nozzle 74, the combustion reaction is stably achieved to achieve the lowest temperature Due to the rise, the temperature inside the combustion chamber 30 can be lowered and leveled, and due to this action, low-pollution combustion is made, and the production of NOx can be reduced below the environmental regulation value.

On the other hand, since the exhaust gas and fly products exist in the third combustion chamber 33 constituting the combustion chamber 30, when the exhaust gas and fly products are recycled using the circulation unit 70, the fly products are discharged from the circulation pipe 71 and the dust. Efficiency may be lowered by accumulation in the use nozzle 74 .

In the present invention, a circulation tube pressure measurement unit 72 and a circulation tube temperature measurement unit 73 for measuring the pressure and temperature inside the circulation tube 71 constituting the circulation unit 70 are formed, and the circulation tube ( 71), this problem was solved by forming a bypass part 90 composed of a bypass pipe 91 branched from the circulation pipe 71 after the CGR nozzle N and a bypass damper 92.

That is, when the circulation pipe 71 or the injection nozzle 74 of the circulation part 70 is clogged by splashes, the circulation pipe pressure measurement unit for measuring the pressure and temperature inside the circulation pipe 71 72 and the bypass pipe 91 constituting the bypass unit 90 when the pressure is high or the temperature is low and does not meet the set value set by the user by monitoring through the circulating pipe temperature measuring unit 73 ) is opened to move the exhaust gas and fly products of the third combustion chamber 33 to the first combustion chamber 31 through the bypass pipe 91 as well as the circulation pipe 71, thereby improving the circulation of the exhaust gas It is possible to increase the efficiency by doing this, as well as to ensure that the circulation unit 70 is operated normally through maintenance in the future, so that the effect of performing the work without interruption of the incineration work can be obtained.

In particular, in the present invention, when a plurality of the above-described circulation unit 70 and the bypass unit 90 are formed, a further improved effect can be obtained by increasing the circulation amount, and especially the spray nozzle 74 among the circulation units 70 If the internal pressure can be too high, the incineration operation is stable by stopping the circulation work through the circulation pipe 71 using the damper 75 for the circulation pipe of the circulation part 70 and working only using the bypass part 90 At the same time, the effect that can be achieved efficiently can be obtained.

Although the above-described embodiment is described for a preferred embodiment of the present invention, it is specified that the present invention is not limited thereto and can be implemented in various forms without departing from the technical spirit of the present invention.

10: inlet
20: moving part
30: combustion chamber
31: 1st combustion chamber 32: 2nd combustion chamber 33: 3rd combustion chamber
40: combustion means
41: first burner 42: second burner
50: outlet
60: gas outlet
70: circulation part
71: circulation tube 72: circulation tube pressure measurement unit 73: circulation tube temperature measurement unit
74: injection nozzle 75: damper for circulation pipe
80: blower for combustion
N: CGR nozzle
90: bypass part
91: bypass pipe 92: damper for bypass
100: Combustion device with improved FGR efficiency

Claims (3)

Inlet through which incineration is injected;
A moving unit for moving the incinerated material injected through the inlet;
a combustion chamber composed of a second combustion chamber formed above the first combustion chamber for primary combustion of incineration materials introduced through the inlet and a third combustion chamber partitioned from the second combustion chamber by a partition wall;
Combustion means comprising a first burner installed in the first combustion chamber and a second burner formed in the second combustion chamber;
a discharge port for discharging the incinerated ash to the outside by moving from the combustion chamber;
a gas outlet formed on one side of the third combustion chamber of the combustion chamber to discharge gas;
A circulation pipe for circulating the exhaust gas of the third combustion chamber constituting the combustion chamber to the first combustion chamber, an injection nozzle formed at an end of the circulation pipe for supplying exhaust gas to the first combustion chamber, and a pressure in the circulation pipe are measured. a circulation unit composed of a circulation tube pressure measurement unit and a circulation tube temperature measurement unit for measuring the temperature of the circulation tube;
a combustion blower connected to the circulation pipe of the circulation unit;
a CGR nozzle formed between the circulation pipe of the circulation unit and the blower for combustion;
It is branched from the circulation pipe of the circulation part and is installed in the bypass pipe and the bypass pipe for circulating the exhaust gas of the third combustion chamber to the first combustion chamber, and is installed in the circulation pipe pressure measuring part and the circulation pipe temperature measuring part of the circulation part. A bypass unit made of a bypass damper that operates to automatically open when the temperature is lower than the set value or the pressure in the circulation pipe is higher than the set value;
The circulation pipe of the circulation part is configured to further include a damper for the circulation pipe capable of opening and closing the circulation pipe,
Combustion device with improved FGR efficiency, characterized in that a plurality of the circulation part and the bypass part are formed. delete delete

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