KR102505683B1 - Apparatus for gas conbusting object and method for gas conbusting object - Google Patents

Abstract

The present invention is to combust the waste gas, the stack having a space for the waste gas is introduced; a moving unit connected to the stack so that 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; It relates to a waste gas combustion device and a waste gas combustion method including; and a controller connected to the supply unit so as to control whether or not to supply the auxiliary fuel.

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 taking molten iron into the converter, blowing oxygen into the converter and blowing molten iron to manufacture molten steel, and tapping the molten steel. During this series of processes, waste gas is generated inside the converter. Accordingly, a hood is installed on the top of the converter to recover waste gas generated inside the converter, and the hood is connected to a ventilation fan through a duct. If negative pressure is created in the duct via the ventilator, waste gases can be sucked from the forehearth into the hood. Afterwards, the waste gas can be discharged after being burned in the stack via ducts and ventilators.

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, a problem arises in that the waste gas is not properly burned. 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 with this method, the waste gas with a relatively low concentration ratio of CO could not be fully 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 device and a waste gas combustion method capable of removing CO from waste gas.

A stack having a space for introducing the waste gas to burn the waste gas of the present invention; a moving unit connected to the stack so that 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 so as to control whether or not to supply the auxiliary fuel.

A measurement unit connected to the control unit and installed in the moving unit so as to measure the concentration ratio of the components included in the waste gas; includes.

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

The supply unit, a reservoir in which auxiliary fuel is stored; a connector having a passage through which auxiliary fuel is movable and connected to the storage unit; and a controller 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 the top of the stack and a lower pipe connected to the bottom of the stack.

The regulator includes a plurality of opening/closing members that are movable toward the center of the passage and overlap each other so as to adjust the degree of opening of at least one passage 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 the concentration ratio of O ₂ in the waste gas.

The diameters of the upper tube and the lower tube gradually decrease along the direction in which the auxiliary fuel moves.

The control unit may include a determiner for determining at least one of whether auxiliary fuel is supplied, a supply position, and a supply amount by comparing the measurement value of the measurement unit with a preset set value; and a controller connected to the supply unit so as 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 coke oven gas generated in steelmaking or ironmaking to the flare stack.

The present invention provides a process for supplying waste gas to a stack capable of burning 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 burning waste gas inside the stack.

The process of analyzing the composition of the waste gas includes analyzing the concentration ratio of CO in the waste gas; and the process of supplying the auxiliary fuel to the stack includes whether or not the auxiliary fuel is supplied according to the concentration ratio of CO in the waste gas. The process of controlling; includes.

The process of controlling whether or not to supply the auxiliary fuel may include comparing the analyzed concentration ratio of CO with a preset set value, and determining whether the CO concentration ratio is less than the set 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 analyzing the concentration ratio of O ₂ in the waste gas; and the process of supplying the auxiliary fuel to the stack includes the supply position of the auxiliary fuel according to the concentration ratio of O ₂ . The process of regulating; includes.

The process of adjusting the supply position of the auxiliary fuel includes supplying the auxiliary fuel to the upper part 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 part of the stack when the concentration ratio of O ₂ is less than the set value. 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, the process of supplying the auxiliary fuel to the stack, by using the flow rate measurement value by the following equation Calculate the supply of auxiliary fuel.

[mathematical expression]

(Where y is the supply of auxiliary fuel, x is 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, t is It means the fitting constant value 10.16.)

The process of calculating the supply amount of the auxiliary fuel includes 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 adjusting and supplying the auxiliary fuel supply amount in real time according to the calculated supply amount or supplying the calculated initial supply amount constantly.

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. Thus, even when the concentration ratio of CO in the waste gas is relatively small, it is possible to suppress or prevent the waste gas from being burned.

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. Thus, it is possible to suppress or prevent the auxiliary fuel from being wasted.

In addition, according to the concentration ratio of O ₂ in the waste gas, the position where the auxiliary fuel is supplied may be changed. Accordingly, waste gas reacts with auxiliary fuel at a place where the pressure is relatively high, and explosion of the waste gas can be suppressed or prevented.

1 is a view showing a gas treatment facility to which a waste gas combustion device is applied.
Figure 2 is a diagram showing a waste gas combustion device according to an embodiment of the present invention.
Figure 3 is a graph showing the concentration ratio of CO and O ₂ in waste gas.
4 is a diagram showing an example of a regulator according to an embodiment of the present invention;
5 is a view showing a modified example of a controller according to an embodiment of the present invention
Figure 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 device and a waste gas combustion device according to an embodiment of the present invention.
9 is a flowchart showing 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, only these embodiments will complete the disclosure of the present invention, and will fully cover the scope of the invention to those skilled in the art. It is provided to inform you. In order to describe 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 an oil refinery, a petrochemical plant, and a steel mill. More specifically, it relates to a waste gas combustion device capable of burning waste gas by selectively supplying an auxiliary fuel according to the composition of the waste gas. Hereinafter, embodiments will be described based on processing equipment used in an iron making process or a steel making process of a steel mill. For example, 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 device 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 Figure 1, the waste gas treatment facility may be connected to the treatment facility. The processing material facility is a reactor capable of receiving and treating molten material 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, a furnace is formed on the top, and a lance 11 may be disposed in the furnace. Of course, the treated material facility may include facilities for processing various treated materials in addition to the converter 10 described above. Molten steel can be manufactured by putting molten iron, scrap iron, and subsidiary materials into the converter 10, blowing oxygen into the molten iron through the lance 11, and refining the molten iron. 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 cover the upper part 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 waste gas from the furnace of the converter 10 . The hood 200 may be open at the bottom and may be installed to surround the furnace of the converter 10 at a position facing the converter 10 vertically. The hood 200 may be connected to the duct 300 . Here, waste gas sucked into the hood 200 may flow into the duct 300 .

The duct 300 may serve as a passage through which waste gas moves. The duct 300 includes 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, and a blower 400 and waste gas combustion. A third duct 330 connecting the device 100 may be included.

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

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

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

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

In the following, with reference to FIG. 2, the waste gas combustion apparatus 100 will be specifically described.

The waste gas combustion device 100 includes a stack 110 having a space for introducing the waste gas to burn the waste gas, a moving unit 120 connected to the stack 110 so that the waste gas can move to the stack 110, and a waste gas A supply unit 140 connected to the stack 110 to selectively supply auxiliary fuel to the stack 110 according to the composition of the fuel supply unit 140 connected to the stack 110 and a control unit 150 connected to the supply unit 140 to control whether auxiliary fuel is supplied. ) may be included. In addition, the waste gas combustion device 100 may include a measurement unit 130 to measure the concentration ratio (ie, volume ratio) of 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, waste gas is not composed of a single component, but may be a gas made by mixing various components (ie, molecules) with each other. Thus, the waste gas may contain various components, and the content ratio (vol.%) of the various components in the waste gas may be different from each other. Therefore, the composition of the waste gas may mean the content ratio (vol.%) of components (eg, CO, O ₂ , etc.) included in the waste gas.

The stack 110 may burn the waste gas introduced into the inside. The stack 110 extends vertically, has a space therein, and may be provided in a chimney shape with a closed lower part and an open upper part. 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 connected to the moving unit 120 and the supply unit 140 respectively. Accordingly, the stack 110 may be supplied with waste gas to 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 a spark plug as fuel. Thus, waste gas may be burned by the generated flame. For example, stack 110 may include a flare stack.

The moving unit 120 may serve as a movement path for waste gas so that the waste gas flowing 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 part of the stack 110 . Accordingly, the waste gas is supplied to the lower portion of the stack 110 through the moving unit 120, and can be ignited by sparks generated by the spark plug and burned by flames.

The measuring unit 130 is connected to the control unit 150 and may be installed on the moving unit 120 to measure the concentration ratio of the 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 measurement unit 130 may measure the flow rate of waste gas passing through the moving unit 120 . The measurement unit 130 may include a component measurer 131 and a flow rate measurer 132 .

The component measurer 131 may measure concentration ratios of components included in the waste gas passing through the moving unit 120 . Here, the component measurer 131 may measure the concentration ratio of components included in the waste gas. In the following, a case in which the component measurer 131 measures the concentration ratio of CO and O ₂ among the components included in the waste gas will be described as an example.

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

Referring to Figure 3, the concentration ratio of CO contained 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.%), a flame may not be generated even when the spark plug is ignited. That is, even if the spark plug generates a spark, the concentration ratio of CO contained in the waste gas is small, and the flame may not be generated. In this case, the waste gas cannot be burned and can be discharged to the top of the stack 110 as it is. Therefore, the concentration ratio of CO contained in the waste gas may be measured in advance using the component measurer 131 so that the waste gas having a relatively small concentration ratio of the included CO can be burned.

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

For example, the component measurer 131 may measure the concentration ratio of CO and O ₂ in the waste gas by detecting electrical conductivity of the waste gas, respectively. That is, the component measurer 131 may contact the waste gas passing through the moving unit 120 and measure the concentration ratio of CO and O ₂ in the waste gas by detecting a change in electrical conductivity of the waste gas. Here, the component measurer 131 may include a methanometer.

The flow rate measuring device 132 may measure the flow rate of waste gas passing through the moving unit 120 . The flow rate measurer 132 may be disposed at the rear end of the component measurer 131 based on the moving direction of the waste gas. For example, the flow rate measurer 132 is provided as a flow sensor and can measure the amount of waste gas passing through the moving unit 120 . Meanwhile, the flow rate measurer 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 rate measurer 132 may be provided as a pressure sensor and measure the flow rate of waste gas through a change in pressure 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 auxiliary fuel to the stack 110 using the concentration ratio of the components measured by the component measurer 131 and the flow rate measured by the flow measurer 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 auxiliary fuel can be stored and may be connected to the connector 142 . Here, the auxiliary fuel may be a gas containing CH ₄ , and may include, for example, LNG gas. That is, the auxiliary fuel may be a gas that allows the waste gas to be ignited even when the concentration ratio of CO contained in the waste gas is low.

The connector 142 may serve as a path through which auxiliary fuel is supplied to the stack 110 . To this end, the connector 142 may be connected to the reservoir 141 and may have a passage 142a through which auxiliary fuel may move. 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, the 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 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 tube 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 waste gas moves with a relatively high concentration ratio of O ₂ (eg, a concentration ratio of O ₂ in waste gas of 6 vol.% or more).

The lower pipe 142d may have one end connected to the valve 142e and the other end connected to a lower part lower than the top of the stack 110 . The lower pipe 142d may be a path through which waste gas moves with a relatively small concentration ratio of O ₂ (eg, a 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 area of the passage 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 flow rate of fluid in a pipe is the same, the larger the cross-sectional area through which fluid passes, the slower the fluid travels. Accordingly, by forming the diameters of the upper tube 142c and the lower tube 142d gradually decrease, auxiliary fuel may 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 position where the auxiliary fuel is supplied according to the concentration ratio of O ₂ contained in the waste gas. For example, when a waste gas containing a large amount of O ₂ , that is, a high concentration ratio of O ₂ (eg, a concentration ratio of O ₂ in waste gas of 6 vol.% or more) reacts with an auxiliary fuel in a closed space, an explosion may occur. Accordingly, it is necessary to supply the auxiliary fuel to a position where a pressure similar to atmospheric pressure is formed in the stack 110 so as to prevent the auxiliary fuel and the waste gas from reacting and exploding. Accordingly, when the O ₂ concentration ratio of the waste gas is relatively high, the valve 142e may open the upper pipe 142c to supply auxiliary fuel to the top of the stack 110 where a pressure similar to atmospheric pressure is formed.

On the other hand, when a waste gas containing a small amount of O ₂ , that is, a relatively small concentration ratio of O ₂ (eg, a concentration ratio of O ₂ in the waste gas is less than 6 vol.%) is supplied to the stack 110, a position where a pressure higher than atmospheric pressure is formed. Auxiliary fuel may be supplied to the lower portion of the in-stack 110 . Thus, the auxiliary fuel can be supplied from the stack 110 at a position adjacent to the position where the waste gas is supplied, and the waste gas can 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 exploding.

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. In the following, a case in which the controller 143 is installed in the main supply pipe 142b will be described as an example. Here, the controller 143 may include a plurality of opening/closing members 143a and a power member (not shown).

4 is a diagram showing 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 a portion of which rotates 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) You can adjust the amount of it. 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 and closing members 143a may be provided in an overlapping manner. The plurality of opening/closing members 143a may be arranged to surround the circumference of the passage 142a. The plurality of opening and 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. Such an opening and closing method of the plurality of opening and closing members 143a may be similar to a method generally applied to an aperture driving method for adjusting an exposure amount of light of a camera. Accordingly, the plurality of opening/closing members 143a may open and close the passage 142a while increasing or decreasing the opening ratio of the passage 142a at a constant rate.

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

In the following, a modified example of the regulator will be described with reference to FIG. 5 . The opening and closing member 143a is provided in plural and may be formed in an overlapping form. One end of the plurality of opening/closing members 143a may be provided in a structure in which only the other end moves toward the center of the passage 142a while the center of rotation is fixed to the inner circumferential surface of the main supply pipe 142b. The opening and closing method of the plurality of opening and closing members 143a may be the same as the method generally applied to the opening and closing method of the orifice. Accordingly, the plurality of opening/closing members 143a open and close the passage 142a, and 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 adjust the supply 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 so as 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 may receive the driving force generated by the motor through the first teeth and the second teeth, rotate, and rotate the plurality of opening/closing members 143a toward the center of the passage 142a.

The controller 150 may control the supply of auxiliary fuel. That is, the controller 150 may control the supply of auxiliary fuel to the stack 110 by controlling at least one of whether auxiliary fuel is supplied, a supply position of auxiliary fuel, and a supply amount of 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 measured values of the measurement unit 130 with preset values to determine whether or not to supply auxiliary fuel, the position of supply of auxiliary fuel, and the supply amount of auxiliary fuel. either one can be judged.

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

In addition, the determiner 151 determines that it is necessary to supply auxiliary fuel to the top of the stack 110 when the measured value of O ₂ measured by the component measurer 131 is equal to or greater than the second set value, and sets the second set value. If it is less than the value, it may be determined that 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.

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

[mathematical expression]

(Where y is the supply of auxiliary fuel, x is 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, t is It means the fitting constant value 10.16.)

The above equation shows the amount of CO to satisfy the combustion efficiency of CO of 99% or more under the conditions of waste gas flow rate of 190,000 Nm ³ /h, water content of 8%, internal temperature of 180 ° C, external temperature of 20 ° C, humidity of 60%, and wind speed of 0 m / s. The relationship between the concentration ratio and the supply of auxiliary fuel was derived through experiments. 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 to supply auxiliary fuel 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 the top of the stack 110 or the bottom 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 aperture 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 auxiliary fuel to be supplied to the stack 110 may be controlled.

7 is a graph showing a supply method of auxiliary fuel.

Referring to FIG. 7 ( a ) , the controller 152 may vary the way in which 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 degree that is combustible without auxiliary fuel, the supply of auxiliary fuel may be stopped. Thereafter, when the concentration ratio of CO in the waste gas becomes uncombustible without auxiliary fuel, the auxiliary fuel may be supplied again and the supply amount may be gradually increased according to the decreasing concentration ratio of CO. Thus, the auxiliary fuel is not wasted, and the auxiliary fuel is suitably supplied according to the inflow amount of the waste gas, and the waste gas can be burned.

Referring to FIG. 7(b) , the controller 152 may constantly supply the calculated initial supply amount of auxiliary fuel to the stack 110 . That is, the supply amount of the auxiliary fuel initially calculated on the basis of time can be constantly supplied for a predetermined time, and the supply can be stopped when the concentration ratio of CO in the waste gas reaches a level that can be combusted without auxiliary fuel. Thereafter, when the concentration ratio of CO in the waste gas becomes uncombustible without auxiliary fuel, the initially calculated supply amount of auxiliary fuel may be constantly supplied for a predetermined time. Thus, in an environment where it is difficult for the controller 152 to control the controller 143 in real time, the auxiliary fuel is supplied to the stack 110 without being cut off and the waste gas can be burned.

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

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

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

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

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

Hereinafter, a waste gas combustion method according to an embodiment of the present invention will be described. A waste gas combustion method relates to a method for burning waste gas by selectively supplying an auxiliary fuel according to the composition of the waste gas. In the following, a case of performing a method of burning waste gas using the waste gas combustion device 100 described above will be described by way of example.

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

Referring to Figure 9, the waste gas combustion method is a process of supplying the waste gas to the stack 110 capable of burning the waste gas (S110), a process of analyzing the composition of the waste gas (S120), selectively using auxiliary fuel according to the composition of the waste gas A process of supplying the waste gas to the stack 110 (S130) and a process of burning waste gas inside the stack 110 (S140) may be included.

First, waste gas may be supplied to the stack 110 (S110). More specifically, dust contained in the waste gas can be removed 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. Thereafter, the waste gas from which dust has been removed may be supplied to the stack 110 by passing through the moving unit 120 .

After that, the composition of the waste gas can be analyzed (S120). That is, the composition of the waste gas passing through the moving unit 120 can be analyzed using the component measuring device 131 . For example, the component measurer 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 waste gas passing through the moving unit 120 may also be measured using the flow rate measuring device 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 performed 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 described as an example.

Thereafter, depending on the composition of the waste gas, auxiliary fuel may be selectively supplied to the stack 110 (S130). More specifically, the determination unit 151 may receive measured values of the component measurer 131 and the flow measurer 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 determination unit 151 determines that the concentration ratio of CO in the waste gas is 12 vol.% or more, auxiliary fuel may not be supplied to the stack 110 (S133). That is, it can be determined that waste gas can be burned without auxiliary fuel in the stack 110 .

On the other hand, if the determination unit 151 determines that the concentration ratio of CO in the waste gas is less than 12 vol.%, the supply amount of the auxiliary fuel to be supplied to the stack 110 can be calculated (S132). That is, it is determined that waste gas cannot be burned without auxiliary fuel in the stack 110, and an auxiliary fuel supply amount 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 using the measurement values measured by the component measurer 131 and the flow measurer 132.

[mathematical expression]

(Where y is the supply of auxiliary fuel, x is 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, t is It means the fitting constant value 10.16.)

Meanwhile, a process of calculating the supply amount of 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 .

Then, the determiner 151 is the concentration ratio of O ₂ in the waste gas It can be determined whether it is less than the 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 determination unit 151 determines that the concentration ratio of O ₂ in the waste gas is less than 6 vol.%, 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 determination unit 151 determines that the concentration ratio of O ₂ in the waste gas is 6 vol.% or more, auxiliary fuel may be supplied to the top 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 auxiliary fuel needs to be supplied to the top of the stack 110, which is a position having a pressure similar to atmospheric pressure.

Then, 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, when the determination unit 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 .

Then, according to the concentration ratio of O ₂ , the controller 152 may operate 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 top or bottom of the stack 110 .

Meanwhile, a method of supplying auxiliary fuel to the stack 110 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 auxiliary fuel supply amount calculated in real time. On the other hand, the initially calculated supply amount of auxiliary fuel may be supplied to the stack 110 at a constant rate using the controller 152 .

Thereafter, a 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 burned and CO may be removed, and the waste gas from which CO may be 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. Thus, even when the concentration ratio of CO in the waste gas is relatively small, it is possible to suppress or prevent the waste gas from being burned. 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. Thus, it is possible to suppress or prevent the auxiliary fuel from being wasted. In addition, according to the concentration ratio of O ₂ in the waste gas, the position where the auxiliary fuel is supplied may be changed. Thus, it is possible to suppress or prevent the waste gas from reacting with the auxiliary fuel and exploding.

As such, in the detailed description of the present invention, specific embodiments have been described, but 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 and should not be defined, but should be defined by not only the claims to be described below, but also those equivalent to these claims.

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

Claims (18)

a stack having a space through which waste gas is introduced so as to burn waste gas;
a moving unit connected to the stack so that 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
To control whether or not to supply the auxiliary fuel, a control unit connected to the supply unit; includes,
the supply unit,
A reservoir in which auxiliary fuel is stored,
A connector having a passage through which 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,
A main supply pipe connected to the reservoir so that auxiliary fuel can move, and
Waste gas combustion apparatus comprising an auxiliary supply pipe connected to the main supply pipe and having an upper pipe connected to an upper portion of the stack and a lower pipe connected to a lower portion of the stack. The method of claim 1,
Waste gas combustion apparatus comprising a; measurement unit connected to the control unit and installed in the moving unit so as to measure the concentration ratio of components included in the waste gas. The method of claim 2,
The measuring unit,
A component measuring device capable of calculating a concentration ratio of at least one of CO and O ₂ in the waste gas by detecting the electrical conductivity of the waste gas; and
In order to measure the flow rate of the waste gas, a flow rate measuring device disposed at the rear end of the component measuring device based on the moving direction of the waste gas; waste gas combustion device comprising a. delete delete The method of claim 1,
The regulator is movable to the center of the passage so as to adjust the degree of opening of at least one passage of the main supply pipe and the auxiliary supply pipe, and includes a plurality of opening and closing members overlapping each other Waste gas combustion apparatus. The method of claim 1,
The auxiliary supply pipe includes a valve for selectively opening and closing the upper pipe or the lower pipe so as to supply auxiliary fuel to the upper pipe or the lower pipe according to the concentration ratio of O ₂ in the waste gas. The method of claim 7,
The upper pipe and the lower pipe, the waste gas combustion device in which the diameter gradually decreases along the direction in which the auxiliary fuel moves. According to claim 2 or claim 3,
The control unit,
a determiner 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 set value;
Waste gas combustion apparatus comprising a; controller connected to the supply unit so as to control the supply of auxiliary fuel according to the judgment of the determiner. The method according to any one of claims 1 to 3 and 6 to 8,
The stack includes 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 waste gas to a stack capable of burning 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
Including; the process of burning the waste gas inside the stack,
The process of analyzing the composition of the waste gas,
Including the process of analyzing the concentration ratio of CO and O ₂ in the waste gas,
The process of supplying the auxiliary fuel to the stack,
Controlling whether or not to supply the auxiliary fuel according to the concentration ratio of CO in the waste gas, and adjusting the supply position of the auxiliary fuel according to the concentration ratio of O ₂ when supplying the auxiliary fuel Waste gas combustion method. delete The method of claim 11,
The process of controlling whether or not to supply the auxiliary fuel,
Comparing the analyzed concentration ratio of CO with a preset set value, and determining whether the CO concentration ratio is less than the set value; and
and supplying the auxiliary fuel to the stack when the concentration ratio of CO is less than the set value. delete The method of claim 11,
The process of adjusting the supply position of the auxiliary fuel,
and supplying the auxiliary fuel to the top 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 part of the stack when the concentration ratio of O ₂ is less than the set value. method. According to claim 13 or claim 15,
Before the process of supplying the auxiliary fuel to the stack, the process of measuring the flow rate of the waste gas; including,
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.
[mathematical expression]

(Where y is the supply of auxiliary fuel, x is 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, t is It means the fitting constant value 10.16.) 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. The method of claim 17
The process of supplying the auxiliary fuel to the stack,
Waste gas combustion method comprising: adjusting and supplying the auxiliary fuel supply amount in real time according to the calculated supply amount, or constantly supplying the calculated initial supply amount.

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