KR20220087767A - Apparatus for gas conbusting object and method for gas conbusting object - Google Patents

Abstract

The present invention is to burn the waste gas, the stack having a space for the waste gas to be introduced; a moving part connected to the stack so that the waste gas can move to the stack; a supply unit connected to the stack to selectively supply auxiliary fuel to the stack according to the composition of the waste gas; and a control unit connected to the supply unit to control whether the auxiliary fuel is supplied.

Description

Waste gas combustion apparatus and waste gas combustion method {Apparatus for gas conbusting object and method for gas conbusting object}

The present invention relates to a waste gas combustion device and a waste gas combustion method, and more particularly, to a waste gas combustion device and a waste gas combustion method capable of controlling the supply of auxiliary fuel according to the composition of the waste gas.

In general, the converter refining process proceeds in the order of a process of taking molten iron into a converter, a process of blowing oxygen into the converter and blowing molten iron to manufacture molten steel, and a process of tapping molten steel. During this series of processes, waste gas is generated inside the converter. Accordingly, a hood is installed above the converter to recover the waste gas generated inside the converter, and the hood is connected to the fan through a duct. When a negative pressure is created in the duct through the fan, the waste gas can be sucked from the converter into the hood. Thereafter, the waste gas may be exhausted after being burned in the stack through a duct and a fan.

On the other hand, in burning the waste gas in the stack, when the concentration ratio of CO in the waste gas is relatively small, there is a problem that the waste gas is not burned properly. If the waste gas is not combusted, the CO contained in the waste gas may be discharged into the atmosphere as it is, causing environmental pollution.

Conventionally, in order to burn waste gas, a method of increasing the capacity and number of burners or installing a windbreak was used. However, even in this way, the waste gas with a relatively low concentration ratio of CO could not be completely burned. Accordingly, there is a need for a technology capable of burning the waste gas regardless of the concentration ratio of CO in the waste gas.

KR10-2003-0037846A

The present invention provides a waste gas combustion device and a waste gas combustion method capable of supplying auxiliary fuel according to the composition of the waste gas.

The present invention provides a waste gas combustion apparatus capable of removing CO from waste gas and a waste gas combustion method.

To burn the waste gas of the present invention, the stack having a space for the waste gas to be introduced; a moving part connected to the stack so that the waste gas can move to the stack; a supply unit connected to the stack to selectively supply auxiliary fuel to the stack according to the composition of the waste gas; and a control unit connected to the supply unit to control whether the auxiliary fuel is supplied.

and a measuring unit connected to the control unit and installed in the moving unit to measure the concentration ratio of components included in the waste gas.

The measuring unit may include: a component measuring device capable of calculating a concentration ratio of at least one of CO and O ₂ in the waste gas by sensing the electrical conductivity of the waste gas; and a flow rate meter disposed at the rear end of the component meter based on the moving direction of the waste gas to measure the flow rate of the waste gas.

The supply unit may include: a reservoir in which auxiliary fuel is stored; a connector having a passage through which the auxiliary fuel is movable and connected to the reservoir; and a regulator installed in the connector to open and close the passage of the connector according to the concentration ratio of CO in the waste gas.

The connector may include a main supply pipe connected to the reservoir so that the auxiliary fuel is movable; and an auxiliary supply pipe connected to the main supply pipe and having an upper pipe connected to an upper part of the stack and a lower pipe connected to a lower part of the stack.

The adjuster includes a plurality of opening and closing members movable to the center of the passage and overlapping each other so as to adjust the degree of opening of at least one of the main supply pipe and the auxiliary supply pipe.

The auxiliary supply pipe includes a valve for selectively opening and closing the upper pipe or the lower pipe to supply auxiliary fuel to the upper pipe or the lower pipe according to a concentration ratio of O ₂ in the waste gas.

The diameter of the upper pipe and the lower pipe is gradually decreased along the direction in which the auxiliary fuel moves.

The control unit may include: a determination unit for determining at least one of whether auxiliary fuel is supplied, a supply position, and a supply amount by comparing the measured value of the measurement unit with a preset setting value; and a controller connected to the supply unit to control the supply of auxiliary fuel according to the determination of the determiner.

The stack includes a flare stack for burning combustible gas, and the moving unit moves the coke oven gas generated in the steelmaking operation or the ironmaking operation to the flare stack.

The present invention is a process of supplying waste gas to a stack capable of burning the waste gas; analyzing the composition of the waste gas; selectively supplying auxiliary fuel to the stack according to the composition of the waste gas; and a process of burning the waste gas in the inside of the stack.

The process of analyzing the composition of the waste gas includes a process of analyzing a concentration ratio of CO in the waste gas, and the process of supplying the auxiliary fuel to the stack includes whether the auxiliary fuel is supplied according to the concentration ratio of CO in the waste gas The process of controlling the; includes.

The process of controlling whether the auxiliary fuel is supplied may include: comparing the analyzed concentration ratio of CO with a preset value, and determining whether the concentration ratio of CO is less than the preset value; and supplying the auxiliary fuel to the stack when the concentration ratio of the CO is less than the set value.

The process of analyzing the composition of the waste gas includes a process of analyzing a concentration ratio of O ₂ in the waste gas, and the process of supplying the auxiliary fuel to the stack includes a supply position of the auxiliary fuel according to the concentration ratio of O ₂ The process of regulating; includes.

In the process of controlling the supply position of the auxiliary fuel, the auxiliary fuel is supplied to the upper portion of the stack when the concentration ratio of O ₂ is greater than or equal to a set value, and when the concentration ratio of O ₂ is less than the set value, the auxiliary fuel is supplied to the lower portion of the stack. The process of supplying auxiliary fuel; includes.

Before the process of supplying the auxiliary fuel to the stack, the process of measuring the flow rate of the waste gas; including, wherein the process of supplying the auxiliary fuel to the stack includes the process of supplying the auxiliary fuel to the stack by the following equation using the flow rate measurement value Calculate the supply amount of auxiliary fuel.

[Equation]

(Where y is the supply amount of auxiliary fuel, x is the value of the concentration ratio of CO in the waste gas, y ₀ is the fitting constant value -951, A is the fitting constant value 10687, x ₀ is the fitting constant value 1.369, and t is It means the fitting constant value of 10.16.)

The process of calculating the supply amount of the auxiliary fuel includes a process of calculating the supply amount in real time according to the concentration ratio of CO in the waste gas.

The process of supplying the auxiliary fuel to the stack includes a process of supplying the auxiliary fuel by adjusting the supply amount of the auxiliary fuel in real time according to the calculated supply amount, or constantly supplying the calculated initial supply amount.

According to an embodiment of the present invention, auxiliary fuel may be selectively supplied to the stack according to the composition of the waste gas. Accordingly, it is possible to suppress or prevent the inability to burn the waste gas even when the concentration ratio of CO in the waste gas is relatively small.

In addition, according to the concentration ratio of CO in the waste gas, the supply amount of the auxiliary fuel can be adjusted in real time. Accordingly, it is possible to suppress or prevent the wastage of the auxiliary fuel.

In addition, according to the concentration ratio of O ₂ in the waste gas, the position to which the auxiliary fuel is supplied may be changed. Accordingly, it is possible to suppress or prevent the waste gas from reacting with the auxiliary fuel in a place where the pressure is relatively high and the waste gas from being exploded.

1 is a view showing a gas treatment facility to which a waste gas combustion device is applied.
Figure 2 is a view showing a waste gas combustion apparatus according to an embodiment of the present invention.
3 is a graph showing the concentration ratio of CO and O ₂ in the waste gas.
4 is a view showing an example of a regulator according to an embodiment of the present invention.
5 is a view showing a modified example of the regulator according to an embodiment of the present invention;
6 is a graph showing the supply amount of auxiliary fuel according to the concentration ratio of CO.
7 is a graph showing a supply method of auxiliary fuel.
8 is a view comparing a conventional combustion apparatus and a waste gas combustion apparatus according to an embodiment of the present invention.
9 is a flowchart illustrating a waste gas combustion method according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and the scope of the invention to those of ordinary skill in the art completely It is provided to inform you. In order to explain the invention in detail, the drawings may be exaggerated, and like reference numerals refer to like elements in the drawings.

The present invention relates to a waste gas combustion device capable of burning waste gas generated in oil refineries, petrochemical plants and steel mills. More specifically, it relates to a waste gas combustion device capable of burning waste gas by selectively supplying auxiliary fuel according to the composition of the waste gas. Hereinafter, an embodiment will be described on the basis of a treatment facility used in a steelmaking process or a steelmaking process of a steel mill. For example, the waste gas may include coke oven gas generated in a steel mill.

1 is a view showing a gas treatment facility to which a waste gas combustion apparatus according to an embodiment of the present invention is applied. First, a gas processing facility to which an embodiment of the present invention is applied will be described.

Referring to FIG. 1 , a waste gas treatment facility may be connected to a treatment facility facility. The processing facility is a reactor capable of receiving and processing the melt in various ways, and may include, for example, a converter 10 capable of receiving and blowing molten iron. The converter 10 has an internal space, the furnace hole is formed in the upper part, the lance 11 can be arranged in the furnace hole. Of course, the treatment facility may include facilities for processing various treatment materials in addition to the converter 10 described above. Molten steel can be manufactured by injecting molten iron, scrap iron, and auxiliary materials into the converter 10 , and refining the molten iron by blowing oxygen into the molten iron through the lance 11 . At this time, a large amount of waste gas mixed with dust may be generated. A large amount of waste gas may be discharged to the outside of the converter 10 through the furnace. Here, a waste gas treatment facility may be coupled to surround the upper portion of the converter 10 in order to recover a large amount of gas.

The waste gas treatment facility may include a waste gas combustion device 100 , a hood 200 , a duct 300 , a dust collector 400 , a tank 500 , and a blower 600 .

First, the hood 200 may suck the waste gas from the furnace opening of the converter 10 . The hood 200 may have an open lower portion, and may be installed to surround the furnace opening of the converter 10 at a position facing the converter 10 up and down. The hood 200 may be connected to the duct 300 . Here, the waste gas sucked into the hood 200 may be introduced into the duct 300 .

The duct 300 may serve as a passage through which the waste gas moves. The duct 300 is a first duct 310 connecting the hood 200 and the dust collector 400 , a second duct 320 connecting the dust collector 400 and the blower 600 , the blower 400 and waste gas combustion A third duct 330 connecting the device 100 may be included.

The dust collector 400 may collect the dust contained in the waste gas. That is, the dust collector 400 may collect the dust by spraying the cooling water supplied from the water collecting tank (not shown) to the waste gas. For example, the dust collector 400 may include a saturator. Here, the cooling water and dust may be stored in the tank 500 connected to the lower portion of the dust collector 400 . The dust remains in the tank 500 and the cooling water may be recovered back to the water collecting tank.

The blower 600 may create a negative pressure. Accordingly, the waste gas may be sucked from the furnace opening of the converter 10 to the hood 200 , and the waste gas may be sucked from the hood 200 to the second duct 320 through the dust collector 400 .

The waste gas passing through the blower 600 may be supplied to the waste gas combustion apparatus 100 through the third duct 330 . That is, the third duct 330 may communicate with the moving unit 120 of the waste gas combustion device 100 to supply the waste gas to the stack 110 of the waste gas combustion device 100 . Thereafter, the waste gas supplied to the waste gas combustion apparatus 100 may be combusted and exhausted in the stack 110 .

2 is a view showing a waste gas combustion apparatus according to an embodiment of the present invention.

Hereinafter, with reference to FIG. 2, the waste gas combustion apparatus 100 will be described in detail.

The waste gas combustion apparatus 100 includes a stack 110 having a space for introducing waste gas to burn waste gas, a moving unit 120 connected to the stack 110 to allow waste gas to move to the stack 110 , and waste gas The supply unit 140 connected to the stack 110 to selectively supply the auxiliary fuel to the stack 110 according to the composition of ) may be included. In addition, the waste gas combustion apparatus 100 may include a measuring unit 130 to measure the concentration ratio (ie, volume ratio) of the components included in the waste gas.

Here, the composition of the waste gas may be a concentration ratio of components included in the waste gas. In general, the waste gas does not consist of a single component, but may be a gas made by mixing various components (ie, molecules) with each other. Accordingly, various components may be included in the waste gas, and the content ratio (vol.%) of the various components in the waste gas may be different from each other. Accordingly, the composition of the waste gas may mean a content ratio (vol.%) of components (eg, CO, O ₂ , etc.) included in the waste gas.

The stack 110 may burn the waste gas introduced therein. The stack 110 may be provided in the shape of a chimney extending vertically, having a space therein, and having a closed lower portion and an open upper portion. Here, since the lower part of the stack 110 is closed, the internal pressure may be higher than atmospheric pressure, and since the upper part of the stack 110 is open, the internal pressure may be similar to atmospheric pressure. In addition, the stack 110 may be respectively connected to the moving unit 120 and the supply unit 140 . Accordingly, the stack 110 may be supplied with waste gas into the internal space through the moving unit 110 , and may be selectively supplied with auxiliary fuel through the supply unit 140 .

In addition, a spark plug (not shown) may be provided inside the stack 110 . In the internal space of the stack 110 , a flame may be generated using waste gas supplied with the spark plug as a fuel. Accordingly, the waste gas may be burned by the generated flame. For example, the stack 110 may include a flare stack.

The moving unit 120 may serve as a movement path of the waste gas so that the waste gas introduced into the third duct 330 can move to the stack 110 . The moving unit 120 may be connected to the duct 300 of the gas treatment facility. For example, the moving unit 120 may have one end connected to the third duct 330 and the other end connected to the lower portion of the stack 110 . Accordingly, the waste gas may be supplied to the lower portion of the stack 110 through the moving unit 120 , may be ignited by a spark generated by the spark plug, and may be combusted by a flame.

The measuring unit 130 may be connected to the control unit 150 and installed in the moving unit 120 to measure the concentration ratio of components included in the waste gas. That is, the measurement unit 130 may measure the content ratio (vol.%) of each of the components included in the waste gas. In addition, the measuring unit 130 may measure the flow rate of the waste gas passing through the moving unit 120 . The measuring unit 130 may include a component measuring unit 131 and a flow rate measuring unit 132 .

The component measuring device 131 may measure a concentration ratio of components included in the waste gas passing through the moving unit 120 . Here, the component measuring device 131 may measure the concentration ratio of the components included in the waste gas. Hereinafter, a case in which the component measuring device 131 measures the concentration ratio of CO and O ₂ among the components included in the waste gas will be exemplarily described.

3 is a graph showing the concentration ratio of CO and O ₂ in the waste gas.

Referring to FIG. 3 , the concentration ratio of CO included in the waste gas may be different depending on the situation. Here, when the concentration ratio of CO contained in the waste gas is relatively small (eg, when the concentration ratio of CO in the waste gas is less than 12 vol.%), even when the spark plug is ignited, a flame may not be generated. That is, even if the spark plug generates a spark, the concentration ratio of CO contained in the waste gas is small, so that a flame may not be generated. In this case, the waste gas is not combusted and may be discharged directly to the upper portion of the stack 110 . Therefore, the concentration ratio of CO included in the waste gas may be measured in advance by using the component measuring device 131 so that the waste gas having a relatively small concentration ratio of CO contained therein can be burned.

In addition, O ₂ may be included in the waste gas. 3, the concentration ratio of O ₂ contained in the waste gas may be different depending on the situation. Here, when the concentration ratio of the included O ₂ is relatively large (eg, when the concentration ratio of O ₂ in the waste gas is 6 vol.% or more), the waste gas reacts with the auxiliary fuel supplied from the supply unit 140 at a pressure higher than atmospheric pressure. and can explode. Accordingly, so that the waste gas does not explode while reacting with the auxiliary fuel, the concentration ratio of O ₂ included in the waste gas may be measured and the position of the auxiliary fuel may be adjusted through the controller 151 to be described later.

For example, the component measuring unit 131 may measure the concentration ratio of CO and O ₂ in the waste gas by sensing the electrical conductivity of the waste gas, respectively. That is, the component measuring unit 131 may measure the concentration ratio of CO and O ₂ in the waste gas by contacting the waste gas passing through the moving unit 120 and detecting a change in electrical conductivity of the waste gas. Here, the component measuring device 131 may include a methano meter.

The flow rate meter 132 may measure the flow rate of the waste gas passing through the moving unit 120 . The flow meter 132 may be disposed at the rear end of the component meter 131 based on the movement direction of the waste gas. For example, the flow meter 132 may be provided as a flow sensor to measure the amount of waste gas passing through the moving unit 120 . On the other hand, the flow meter 132 may measure the flow rate of the waste gas by measuring the internal pressure of the moving unit 120 through which the waste gas moves. For example, the flow meter 132 may be provided as a pressure sensor to measure the flow rate of the waste gas through a pressure change inside the moving unit 120 .

The supply unit 140 may selectively supply auxiliary fuel to the stack 110 according to the composition of the waste gas. That is, the supply unit 140 may selectively supply the auxiliary fuel to the stack 110 using the concentration ratio of the components measured by the component measuring device 131 and the flow rate measurement value measured by the flow measuring device 132 . The supply unit 140 may include a reservoir 141 , a connector 142 , and a regulator 143 .

The reservoir 141 may store auxiliary fuel. The reservoir 141 has a space in which the auxiliary fuel can be stored, and can be connected to the connector 142 . Here, the auxiliary fuel may be a gas containing CH ₄ , for example, it may include an LNG gas. That is, the auxiliary fuel may be a gas that enables the waste gas to be ignited even if the concentration ratio of CO included in the waste gas is low.

The connector 142 may serve as a path through which the auxiliary fuel is supplied to the stack 110 . To this end, the connector 142 is connected to the reservoir 141 and may have a passage 142a through which the auxiliary fuel is movable. The connector 142 may include a main supply pipe 142b and an auxiliary supply pipe.

The main supply pipe 142b may be provided as a pipe extending from the reservoir 141 toward the stack 110 . One end of the main supply pipe 142b may be connected to the reservoir 141 and the other end may be connected to a valve 142e of an auxiliary supply pipe to be described later. Here, the main supply pipe (142b) may be formed through the inside so that the auxiliary fuel can pass through the inside. Here, the penetrated inside of the main supply pipe 142b may be the aforementioned passage 142a. On the other hand, a regulator 143 may be installed in the passage 142a of the main supply pipe 142b.

The auxiliary supply pipe may have one end connected to the main supply pipe 142b and the other end connected to the stack 110 . The auxiliary supply pipe may serve as a path through which the waste gas passing through the main supply pipe 142b is supplied to the stack 110 . The auxiliary supply pipe may include an upper pipe 142c, a lower pipe 142d, and a valve 142e.

The upper pipe 142c may have one end connected to the valve 142e and the other end connected to the top of the stack 110 . The upper pipe 142c may be a path through which the concentration ratio of O ₂ contained is relatively large (eg, the concentration ratio of O ₂ in the waste gas is 6 vol.% or more) through which the waste gas moves.

The lower pipe 142d may have one end connected to the valve 142e and the other end connected to a lower portion lower than the upper portion of the stack 110 . The lower pipe 142d may be a path through which the waste gas moves with a relatively small concentration ratio of O ₂ contained therein (eg, the concentration ratio of O ₂ in the waste gas is less than 6 vol.%).

On the other hand, the upper pipe (142c) and the lower pipe (142d) may be provided in a shape in which the diameter gradually decreases along the direction in which the auxiliary fuel moves. That is, the cross-sectional areas of the passages 142a of the upper pipe 142c and the lower pipe 142d may be formed in a shape that gradually decreases along the direction in which the auxiliary fuel moves.

In general, when the fluid in a pipe has the same flow rate, the moving speed of the fluid may be relatively slow as the cross-sectional area passing through it is larger, and the moving speed of the fluid may be relatively fast as the passing cross-sectional area is narrower. Accordingly, the diameters of the upper pipe 142c and the lower pipe 142d are gradually decreased, so that the auxiliary fuel can be quickly supplied to the stack 110 . Accordingly, the auxiliary fuel is smoothly supplied to the stack 110 and reacts with the waste gas in the stack 110 to effectively burn the waste gas.

The valve 142e is connected to the main supply pipe 142b, the upper pipe 142c, and the lower pipe 142d, respectively, and can selectively open and close the upper pipe 142c or the lower pipe 142d. For example, the valve 142e may include a solenoid valve or a switch valve.

On the other hand, it is preferable to change the supply position of the auxiliary fuel according to the concentration ratio of O ₂ contained in the waste gas. For example, if the waste gas and auxiliary fuel containing a large amount of O ₂ , that is, the concentration ratio of O ₂ is large (eg, the concentration ratio of O ₂ in the waste gas is 6 vol.% or more), react in an enclosed space, it may explode. Accordingly, it is necessary to supply the auxiliary fuel to a position in which a pressure similar to atmospheric pressure is formed in the stack 110 to prevent the auxiliary fuel and waste gas from reacting and explosion. Accordingly, when the O ₂ concentration ratio of the waste gas is relatively large, the valve 142e opens the upper pipe 142c to supply auxiliary fuel to the upper portion of the stack 110 at a position where a pressure similar to atmospheric pressure is formed.

On the other hand, when the waste gas containing a small amount of O ₂ , that is, the concentration ratio of O ₂ is relatively small (eg, the concentration ratio of O ₂ in the waste gas is less than 6 vol.%), is supplied to the stack 110, a pressure higher than atmospheric pressure is formed Auxiliary fuel may be supplied to the lower portion of the in-stack 110 . Accordingly, the auxiliary fuel may be supplied at a position adjacent to the position where the waste gas is supplied in the stack 110 , and thus the waste gas may be burned relatively quickly. As such, since the supply position of the auxiliary fuel is selectively changed according to the O ₂ concentration ratio of the waste gas, it is possible to suppress or prevent the auxiliary fuel and the waste gas from reacting and explosion.

The regulator 143 may open and close the passage 142a of the connector 142 according to the concentration ratio of CO in the waste gas. Here, the regulator 143 may be installed in at least one of the main supply pipe 142b and the auxiliary supply pipe of the connector 142 . Hereinafter, a case in which the regulator 143 is installed in the main supply pipe 142b will be exemplarily described. Here, the regulator 143 may include a plurality of opening and closing members 143a and a power member (not shown).

4 is a diagram illustrating an example of a regulator according to an embodiment of the present invention.

Referring to Figure 4, the opening and closing member (143a) is provided in plurality, at least some of the rotational movement toward the center of the passage (142a) of the main supply pipe (142b), the opening of the passage (142a) of the main supply pipe (142b) It is possible to adjust the degree of That is, the opening and closing member 143a may open and close the passage 142a of the main supply pipe 142b. For example, the plurality of opening/closing members 143a may be provided to overlap each other. The plurality of opening and closing members 143a may be disposed to surround the circumference of the passage 142a. The plurality of opening/closing members 143a may move toward the center of the passage 142a in a direction orthogonal to the direction in which the auxiliary fuel moves. The opening/closing method of the plurality of opening/closing members 143a may be similar to a method generally applied to an iris driving method for controlling the amount of light exposure of the camera. Accordingly, the plurality of opening and closing members 143a can open and close the passage 142a while increasing/decreasing the opening ratio of the passage 142a at a constant rate.

5 is a view showing a modified example of the regulator according to an embodiment of the present invention.

Hereinafter, a modified example of the regulator will be described with reference to FIG. 5 . The opening/closing member 143a may be provided in plurality and may be formed to overlap each other. One end of the plurality of opening and closing members 143a may be provided in a structure in which only the other end moves to the center of the passage 142a while the rotation center is fixed to the inner circumferential surface of the main supply pipe 142b. The opening/closing method of the plurality of opening/closing members 143a may be the same as the method generally applied to the opening/closing method of the orifice. Accordingly, the plurality of opening and closing members 143a open and close the passage 142a, and the auxiliary fuel may or may not be supplied from the supply unit 140 to the stack 110 . In addition, the plurality of opening/closing members 143a increase or decrease the opening ratio of the passage 142a at a constant rate and control the amount of auxiliary fuel supplied from the supply unit 140 to the stack 110 .

The power member may be connected to the plurality of opening and closing members 143a to move the plurality of opening and closing members 143a. For example, the power member may include a rotating body, a motor, first teeth, second teeth, and third teeth. The rotating body may be rotatably installed along the edge of the passage (142a). That is, the rotating body receives the driving force generated by the motor through the first and second teeth, and rotates to rotate the plurality of opening and closing members 143a toward the center of the passage 142a.

The control unit 150 may control the supply of auxiliary fuel. That is, the control unit 150 may control the supply of the auxiliary fuel to the stack 110 by controlling at least one of whether the auxiliary fuel is supplied, a supply position of the auxiliary fuel, and a supply amount of the auxiliary fuel. The controller 150 may include a determiner 151 and a controller 152 .

The determiner 151 is connected to the measurement unit 130 and compares the measurement values of the measurement unit 130 with preset set values to at least one of the auxiliary fuel supply status, the auxiliary fuel supply position, and the auxiliary fuel supply amount. either one can be judged.

More specifically, the set value (hereinafter, referred to as a first set value) of the determiner 151 regarding CO may be a concentration ratio of CO in the waste gas of 12 vol.%. In addition, the set value of the determiner 151 regarding O ₂ (hereinafter, referred to as a second set value) may be a concentration ratio of O ₂ in the waste gas of 6 vol.%. Accordingly, the determiner 151 determines that the auxiliary fuel needs to be supplied when the measured value of CO measured by the component measuring device 131 is less than the first set value, and when the measured value is equal to or greater than the first set value, the auxiliary fuel is supplied. You may decide that it is not necessary.

In addition, the determiner 151 determines that it is necessary to supply auxiliary fuel to the upper portion of the stack 110 when the measured value of O ₂ measured by the component measuring device 131 is equal to or greater than the second set value, and the second set value When the value is less than the value, it may be determined that the auxiliary fuel needs to be supplied to the lower portion of the stack 110 .

6 is a graph showing the supply amount of auxiliary fuel according to the concentration ratio of CO.

Referring to FIG. 6 , the determiner 151 determines the supply amount of the auxiliary fuel to be supplied to the stack 110 by the following equation using the values measured by the component meter 131 and the flow rate meter 132 ( That is, it can be calculated).

[Equation]

(Where y is the supply amount of auxiliary fuel, x is the value of the concentration ratio of CO in the waste gas, y ₀ is the fitting constant value -951, A is the fitting constant value 10687, x ₀ is the fitting constant value 1.369, and t is It means the fitting constant value of 10.16.)

The above equation is, in the condition of waste gas flow rate 190,000Nm ³ /h, water content 8%, internal temperature 180 ℃, external temperature 20 ℃, humidity 60%, wind speed 0 m / s to satisfy the combustion efficiency of CO 99% or more The relationship between the concentration ratio and the supply amount of auxiliary fuel was derived through an experiment. Meanwhile, the fitting constant value may change in proportion to the changing waste gas flow rate.

The controller 152 is connected to the regulator 143 and the valve 142e, respectively, and may control at least one of the regulator 143 and the valve 142e. The controller 152 may control the regulator 143 to open or close the passage 142a of the main supply pipe 142b. Accordingly, whether the auxiliary fuel is supplied from the supply unit 140 to the stack 110 may be controlled.

In addition, the controller 152 may control the valve 142e to selectively open and close the upper pipe 142c or the lower pipe 142d. Accordingly, the supply position of the auxiliary fuel may be controlled to an upper portion of the stack 110 or a lower portion of the stack 110 .

In addition, the controller 152 may control the regulator 143 to adjust the degree of opening of the passage 142a of the main supply pipe 142b. That is, the opening ratio of the passage 142a may be adjusted so that the auxiliary fuel supply amount calculated by the determiner 151 is supplied. Accordingly, the supply amount of the auxiliary fuel to be supplied to the stack 110 may be controlled.

7 is a graph illustrating an auxiliary fuel supply method.

Referring to FIG. 7A , the controller 152 may vary the method in which the auxiliary fuel is supplied from the supply unit 140 to the stack 110 . More specifically, the controller 152 may supply the auxiliary fuel to the stack 110 while adjusting the supply amount of the auxiliary fuel in real time according to the supply amount calculated by the determiner 151 . That is, when the concentration ratio of CO in the waste gas is low based on time, the supply amount of the auxiliary fuel can be relatively increased. Thereafter, the supply amount of the auxiliary fuel may be gradually reduced according to the increasing concentration ratio of CO, and when the concentration ratio of CO in the waste gas reaches a level capable of combustion without the auxiliary fuel, the supply of the auxiliary fuel may be stopped. Thereafter, when the concentration ratio of CO in the waste gas becomes such that combustion is impossible without the auxiliary fuel, the auxiliary fuel may be supplied again and the supply amount may be gradually increased according to the decreasing CO concentration ratio. Accordingly, the auxiliary fuel is not wasted, the auxiliary fuel is appropriately supplied according to the inflow amount of the waste gas, and the waste gas can be burned.

Referring to FIG. 7B , the controller 152 may constantly supply the calculated initial supply amount of the auxiliary fuel to the stack 110 . That is, the supply amount of the auxiliary fuel initially calculated based on the time may be constantly supplied for a predetermined time, and the supply may be stopped when the concentration ratio of CO in the waste gas reaches a level that can be combusted without the auxiliary fuel. Thereafter, when the concentration ratio of CO in the waste gas becomes such that combustion is impossible without the auxiliary fuel, the initially calculated supply amount of the auxiliary fuel may be constantly supplied for a predetermined time. Accordingly, in an environment in which it is difficult for the controller 152 to control the regulator 143 in real time, the auxiliary fuel is not cut off and is supplied to the stack 110 and the waste gas can be burned.

8 is a view comparing a conventional combustion apparatus and a waste gas combustion apparatus according to an embodiment of the present invention.

Referring to FIG. 8 , in the temperature distribution, in the conventional comparative example, there was a problem that a flame was not formed when the waste gas having a relatively small CO concentration ratio was burned. That is, the spark plug failed to form a flame by using the waste gas as a fuel. Accordingly, the waste gas could not be burned. On the other hand, in the embodiment of the present invention, when burning waste gas having a relatively small concentration ratio of CO, a flame may be formed. That is, the auxiliary fuel can be selectively supplied according to the concentration ratio of CO to form a flame regardless of the concentration ratio of CO. Accordingly, the waste gas can be burned.

In addition, in the CO distribution, in the conventional comparative example, there was a problem in that the waste gas was not combusted and unburned (unburned) was generated. That is, there was a problem that CO contained in the waste gas could not be removed. Accordingly, waste gas including CO was discharged to the outside of the stack, thereby causing environmental pollution. On the other hand, in the embodiment of the present invention, the waste gas is burned and the amount of unburned (unburned) is reduced. That is, CO included in the waste gas may be removed, and the waste gas from which the CO has been removed may be discharged to the outside of the stack. Accordingly, it is possible to suppress or prevent environmental pollution from occurring.

The structure and shape of the components of the waste gas combustion apparatus 100 described above are not limited thereto, and may vary.

On the other hand, the process of burning waste gas in the waste gas combustion apparatus 100 according to an embodiment of the present invention will be described together with the process while explaining the waste gas combustion method.

Hereinafter, a waste gas combustion method according to an embodiment of the present invention will be described. The waste gas combustion method relates to a method capable of burning the waste gas by selectively supplying auxiliary fuel according to the composition of the waste gas. Hereinafter, a case in which the waste gas combustion method is performed by using the above-described waste gas combustion apparatus 100 will be exemplarily described.

9 is a flowchart illustrating a waste gas combustion method according to an embodiment of the present invention.

9, the waste gas combustion method is a process of supplying waste gas to a stack 110 capable of burning waste gas (S110), a process of analyzing the composition of the waste gas (S120), and selectively auxiliary fuel according to the composition of the waste gas It may include a process of supplying the stack 110 ( S130 ) and a process of burning the waste gas in the inside of the stack 110 ( S140 ).

First, waste gas may be supplied to the stack 110 (S110). More specifically, by passing the waste gas generated in the converter 10 through the hood 200, the duct 300, the dust collector 400, and the blower 600 of the gas treatment facility, it is possible to remove the dust contained in the waste gas. Thereafter, the dust-removed waste gas may be passed through the moving unit 120 to be supplied to the stack 110 .

Thereafter, the composition of the waste gas may be analyzed (S120). That is, the composition of the waste gas passing through the moving unit 120 may be analyzed using the component measuring device 131 . For example, the component measuring device 131 may analyze the concentration ratio of CO in the waste gas and the concentration ratio of O ₂ in the waste gas.

In addition, the flow rate of the waste gas passing through the moving unit 120 may be measured using the flow rate meter 132 . The process of measuring the flow rate of the waste gas may be performed simultaneously with the process of analyzing the composition of the waste gas, or may be carried out before or after the process of analyzing the composition of the waste gas. In an embodiment of the present invention, a case in which the process of measuring the flow rate of the waste gas proceeds after the process of analyzing the composition of the waste gas will be exemplarily described.

Thereafter, the auxiliary fuel may be selectively supplied to the stack 110 according to the composition of the waste gas (S130). More specifically, the determination unit 151 may receive the measurement values of the component measuring device 131 and the flow rate measuring device 132 . Thereafter, the determiner 151 may determine whether the measured value measured by the component measurer 131 is less than a set value (S131). That is, the determiner 151 may determine whether the concentration ratio of CO in the waste gas is less than 12 vol.%.

If the determiner 151 determines that the concentration ratio of CO in the waste gas is 12 vol.% or more, the auxiliary fuel may not be supplied to the stack 110 (S133). That is, it can be determined that the waste gas can be burned without auxiliary fuel in the stack 110 .

On the other hand, if the determiner 151 determines that the concentration ratio of CO in the waste gas is less than 12 vol.%, it is possible to calculate the supply amount of the auxiliary fuel to be supplied to the stack 110 (S132). That is, it is determined that the waste gas cannot be combusted without the auxiliary fuel in the stack 110 , and the amount of auxiliary fuel to be supplied may be calculated. Here, the determiner 151 may calculate the supply amount of the auxiliary fuel to be supplied to the stack 110 by the following equation by using the measured values measured by the component measuring device 131 and the flow rate measuring device 132 .

[Equation]

(Where y is the supply amount of auxiliary fuel, x is the value of the concentration ratio of CO in the waste gas, y ₀ is the fitting constant value -951, A is the fitting constant value 10687, x ₀ is the fitting constant value 1.369, and t is It means the fitting constant value of 10.16.)

Meanwhile, the process of calculating the supply amount of the auxiliary fuel to be supplied to the stack 110 may be omitted. That is, the auxiliary fuel may be supplied to the stack 110 by a predetermined supply amount without calculating the supply amount of the auxiliary fuel to be supplied to the stack 110 .

Thereafter, the determiner 151 determines the concentration ratio of O ₂ in the waste gas It can be determined whether it is less than a set value (S134). That is, it can be determined whether the concentration ratio of O ₂ in the waste gas is less than 6 vol.%.

If the determiner 151 determines that the concentration ratio of O ₂ in the waste gas is less than 6 vol.%, the auxiliary fuel may be supplied to the lower portion of the stack 110 (S135). That is, the determiner 151 may determine that it may not explode even if the waste gas reacts with the auxiliary fuel at a position having a pressure higher than atmospheric pressure, and may determine that it is necessary to supply the auxiliary fuel to the lower portion of the stack 110 .

On the other hand, if the determiner 151 determines that the concentration ratio of O ₂ in the waste gas is 6 vol.% or more, the auxiliary fuel may be supplied to the upper portion of the stack 110 (S136). That is, the determiner 151 may determine that an explosion may occur when the waste gas reacts with the auxiliary fuel at a position having a pressure higher than atmospheric pressure. Accordingly, it may be determined that the auxiliary fuel needs to be supplied to the upper portion of the stack 110 , which is a position having a pressure similar to atmospheric pressure.

Thereafter, the determiner 151 may transmit the determined information to the controller 152 . The controller 152 may control the regulator 143 to open or close the passage 142a of the main supply pipe 142b. That is, if the determiner 151 determines that the concentration ratio of CO in the waste gas is less than 12 vol.%, the controller 143 may be operated to open the passage 142a of the main supply pipe 142b. Thereafter, the degree of opening of the passage 142a may be adjusted according to the auxiliary fuel supply amount calculated by the determiner 151 .

Thereafter, according to the concentration ratio of O ₂ , the controller 152 operates the valve 142e to open the upper pipe 142c or the lower pipe 142d. That is, the controller 152 may control the valve 142e to open the upper pipe 142c or the lower pipe 142d, and supply auxiliary fuel to the upper or lower portions of the stack 110 .

Meanwhile, a method of supplying the auxiliary fuel to the stack 110 by using the controller 152 may be varied. First, the auxiliary fuel supply amount supplied to the stack 110 may be adjusted in real time by operating the regulator 143 according to the real-time calculated auxiliary fuel supply amount. On the other hand, the supply amount of the auxiliary fuel initially calculated using the controller 152 may be constantly supplied to the stack 110 .

Thereafter, the spark plug operates inside the stack 110 , and a flame may be generated using waste gas and auxiliary fuel as fuel. Accordingly, the waste gas may be combusted and CO may be removed, and the waste gas from which the CO has been removed may be discharged to the outside of the stack 110 .

As such, the auxiliary fuel may be selectively supplied to the stack according to the composition of the waste gas. Accordingly, it is possible to suppress or prevent the inability to burn the waste gas even when the concentration ratio of CO in the waste gas is relatively small. In addition, according to the concentration ratio of CO in the waste gas, the supply amount of the auxiliary fuel can be adjusted in real time. Accordingly, it is possible to suppress or prevent the wastage of the auxiliary fuel. In addition, according to the concentration ratio of O ₂ in the waste gas, it is possible to change the position at which the auxiliary fuel is supplied. Accordingly, it is possible to suppress or prevent the waste gas from reacting with the auxiliary fuel to explode.

As such, although specific embodiments have been described in the detailed description of the present invention, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims to be described below as well as the claims and equivalents.

100: waste gas combustion device 110: stack
120: moving unit 130: measuring unit
140: supply unit 150: control unit

Claims (18)

a stack having a space for introducing the waste gas to burn the waste gas;
a moving part connected to the stack so that the waste gas can move to the stack;
a supply unit connected to the stack to selectively supply auxiliary fuel to the stack according to the composition of the waste gas; and
Waste gas combustion apparatus comprising a; a control unit connected to the supply unit to control whether the auxiliary fuel is supplied. The method according to claim 1,
Waste gas combustion apparatus comprising a; connected to the control unit, the measuring unit is installed in the moving unit so as to measure the concentration ratio of the components included in the waste gas. 3. The method according to claim 2,
The measurement unit,
A component measuring device capable of calculating the concentration ratio of at least one of CO and O ₂ in the waste gas by sensing the electrical conductivity of the waste gas; and
Waste gas combustion device comprising a; in order to measure the flow rate of the waste gas, a flow meter disposed at the rear end of the component measuring device based on the movement direction of the waste gas. The method according to claim 1,
The supply unit,
a reservoir in which auxiliary fuel is stored;
a connector having a passage through which the auxiliary fuel is movable and connected to the reservoir; and
Waste gas combustion apparatus comprising a; a regulator installed in the connector to open and close the passage of the connector according to the concentration ratio of CO in the waste gas. 5. The method according to claim 4,
The connector is
a main supply pipe connected to the reservoir so that the auxiliary fuel is movable; and
Waste gas combustion apparatus including a; connected to the main supply pipe, the auxiliary supply pipe having an upper pipe connected to the upper part of the stack and a lower pipe connected to the lower part of the stack. 6. The method of claim 5,
The regulator includes a plurality of opening and closing members movable to the center of the passage and overlapping each other so as to adjust the degree of opening of at least one of the main supply pipe and the auxiliary supply pipe. 6. The method of claim 5,
The auxiliary supply pipe includes a valve for selectively opening and closing the upper pipe or the lower pipe to supply auxiliary fuel to the upper pipe or the lower pipe according to a concentration ratio of O ₂ in the waste gas. 8. The method of claim 7,
The upper pipe and the lower pipe, a waste gas combustion device whose diameter is gradually reduced along the direction in which the auxiliary fuel moves. 2. The internal tooth according to any one of claims 8 to
The control unit is
a determiner for determining at least one of whether auxiliary fuel is supplied, a supply location, and a supply amount by comparing the measured value of the measurement unit with a preset setting value;
Waste gas combustion apparatus comprising a; according to the determination of the determiner, a controller connected to the supply unit to control the supply of auxiliary fuel. 9. The method according to any one of claims 1 to 8,
The stack comprises a flare stack for burning combustible gas,
The moving unit is a waste gas combustion device for moving the coke oven gas generated in the steelmaking operation or the ironmaking operation to the flare stack. supplying the waste gas to a stack capable of burning the waste gas;
analyzing the composition of the waste gas;
selectively supplying auxiliary fuel to the stack according to the composition of the waste gas; and
Waste gas combustion method comprising a; the process of burning the waste gas in the inside of the stack. 12. The method of claim 11,
The process of analyzing the composition of the waste gas includes a process of analyzing the concentration ratio of CO in the waste gas;
The process of supplying the auxiliary fuel to the stack includes a process of controlling whether to supply the auxiliary fuel according to a concentration ratio of CO in the waste gas. 13. The method of claim 12,
The process of controlling whether the auxiliary fuel is supplied is,
The process of comparing the analyzed concentration ratio of CO with a preset set value, and determining whether the concentration ratio of CO is less than the set value; and
When the concentration ratio of the CO is less than the set value, the process of supplying the auxiliary fuel to the stack; Waste gas combustion method comprising a. 14. The method of claim 13,
The process of analyzing the composition of the waste gas includes a process of analyzing the concentration ratio of O ₂ in the waste gas;
The process of supplying the auxiliary fuel to the stack includes adjusting a supply position of the auxiliary fuel according to the concentration ratio of O ₂ . 15. The method of claim 14,
The process of adjusting the supply position of the auxiliary fuel is,
Waste gas combustion comprising; supplying the auxiliary fuel to the upper portion of the stack when the concentration ratio of O ₂ is greater than or equal to a set value, and supplying the auxiliary fuel to the lower portion of the stack when the concentration ratio of O ₂ is less than the set value Way. 16. The method according to any one of claims 13 to 15,
Including; before the process of supplying the auxiliary fuel to the stack, the process of measuring the flow rate of the waste gas;
The process of supplying the auxiliary fuel to the stack is a waste gas combustion method of calculating the supply amount of the auxiliary fuel by the following equation using a flow rate measurement value.
[Equation]

(Where y is the supply amount of auxiliary fuel, x is the value of the concentration ratio of CO in the waste gas, y ₀ is the fitting constant value -951, A is the fitting constant value 10687, x ₀ is the fitting constant value 1.369, and t is It means the fitting constant value of 10.16.) 17. The method of claim 16,
The process of calculating the supply amount of the auxiliary fuel, the process of calculating the supply amount in real time according to the concentration ratio of CO in the waste gas; Waste gas combustion method comprising a. 18. The method of claim 17,
The process of supplying the auxiliary fuel to the stack,
Waste gas combustion method comprising; supplying by adjusting the supply amount of auxiliary fuel in real time according to the calculated supply amount, or constantly supplying the calculated initial supply amount.

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