KR100954199B1 - Device for adjusting temperature of coke oven - Google Patents

Abstract

A combustion chamber having a plurality of flows for coke distillation charged in a carbonization chamber so as to increase the temperature by supplying additional gas to both flows of the combustion chamber to prevent the temperature drop phenomenon caused by the influence of external temperature; A mixed gas supply duct for supplying a mixed gas for combustion to a burner installed in each flow of the air, an air supply box for supplying air to the flow of the combustion chamber, a gas supply line provided separately from the mixed gas supply duct, the gas supply line It is connected to and extends to the flow of the combustion chamber provides a coke oven combustion chamber heating apparatus including a heating gas pipe for supplying additional combustion gas.

Combustion chamber, flow, gas supply line, heating gas pipe, air supply line, air input pipe

Description

Coke oven combustion chamber temperature raising device {DEVICE FOR ADJUSTING TEMPERATURE OF COKE OVEN}

The present invention relates to a coke oven. More specifically, the present invention relates to a coke oven combustion chamber temperature increasing apparatus capable of preventing a temperature drop in the coke oven combustion chamber.

In general, the coke manufacturing process is one of steelmaking processes in which a coal mixture is charged into a carbonization chamber of a coke oven, and a mixed gas and combustion air are supplied into the combustion chamber to carbonize the coke of the carbonization chamber with heat generated therein.

In the coke plant, high temperatures (1100 ° C to 1350 ° C) are continuously maintained according to the operating rate to produce coke in the coke oven. In order to maintain a high temperature, a method of supplying a gas to the combustion chamber is generally adopted. The coke oven combustion chamber has a supply system paired with an adjacent combustion chamber to periodically operate odd and even rows to maintain a target temperature by supplying a constant gas mixture.

One combustion chamber consists of 34 individual flues, each with its own burner of refractory lead.

Here, the flow at both ends of the coke oven, which is the portion adjacent to the outside, is kept at a very low temperature due to heat loss and heat dissipation. This is because the flow located at the edge of the coke oven carbonization chamber has the greatest heat loss due to the contact with the outside air when the oven door is removed during the charging and extrusion operation by the coke oven operation rate.

As a result, the temperature in the furnace drops sharply, causing coal to be undried on both sides of the flow side of the coke oven. Therefore, quality variation of coke occurs and pollution occurs during extrusion. In addition, the phenomenon that the coke is attached to the CDQ basket, the operation is delayed, there is a problem that the output decreases.

The present invention provides a coke oven combustion chamber heating apparatus capable of preventing a drop in temperature caused by the influence of external air temperature by supplying additional gas to both flows of the combustion chamber.

To this end, the apparatus includes a combustion chamber having a plurality of flows for coke distillation charged in a carbonization chamber, a mixed gas supply duct for supplying a mixed gas for combustion to a burner installed in each flow of the combustion chamber, and a flow path of the combustion chamber. It may include an air supply box for supplying air, a gas supply line provided separately from the mixed gas supply duct, an elevated gas pipe connected to the gas supply line and extended to the flow of the combustion chamber to further supply gas for combustion.

Here, the heating gas pipe may be connected to flows at both ends of each flow constituting the combustion chamber.

Therefore, each flow of the combustion chamber, in particular, flow gas located at both ends of the combustion chamber, the mixed gas through the gas supply duct and the combustion gas through a separate elevated gas pipe are supplied to increase the temperature of the flow, thereby preventing a temperature drop.

In addition, the apparatus may further include an air supply line for supplying air, and an air pipe connected to the air supply line and extending to the flow of the combustion chamber to supply air.

In addition, the apparatus may further include a reversing unit for controlling the operation of the supply of gas and air flowing into the heated gas pipe and the air pipe in accordance with the alternating operating conditions of the combustion chamber.

In addition, the apparatus may further include a residual gas removing unit for supplying air into the heating gas pipe to blow out the residual gas into the combustion chamber to prevent the generation of carbon by the residual gas.

The gas supply line may have a structure for supplying coke oven gas (COG).

In this way, the apparatus supplies and combusts the coke oven gas in parallel with the mixing so that each flow of the combustion chamber, especially the flows located at both ends, can be maintained at the temperature required for operation.

In addition, it is not necessary to put the entire excess heat for the temperature rise of the one-side flow, it is possible to lower the cost according to the heat source supply by using a combustion system in which the heat source supply is idle in the existing equipment.

In addition, it is possible to prevent the generation of pollution due to unburned coal due to the temperature of the combustion chamber.

In addition, it is possible to minimize the damage to the furnace body by easy management of the lowest temperature during long periods of coke production pause.

It can also contribute to stabilization of the post-process.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

It is noted that the figures are schematic and not drawn to scale. The relative dimensions and ratios of the parts in the figures have been exaggerated or reduced in size for clarity and convenience in the figures and any dimensions are merely exemplary and not limiting. And the same structure, element or part that appears in more than one figure the same reference numerals are used in different embodiments to indicate corresponding or similar features.

1 illustrates a coke oven. Looking at the coke oven with reference to FIG. 1 as follows.

As shown in FIG. 1, the coke oven 10 includes a plurality of carbonization chambers 11 into which a coal mixture is charged, and a combustion chamber 12 disposed at both sides of the carbonization chambers and combusting in the coke oven. Include. The combustion chamber includes 36 flows 13 partitioned into refractory bricks.

In addition, a heat storage chamber 14 is disposed below the carbonization chamber 11 and the combustion chamber 12, and a mixed gas supply duct may be supplied to each of the heat storage chambers so that the mixed gas for combustion and the air for combustion can be supplied into the combustion chamber. 15 and the air supply box 16 are installed in communication.

The coke oven 10 has a reversing time for changing the injection direction of the air and the mixed gas supplied in even and odd rows of the combustion chamber flow every 20 minutes in order to uniformly manage the low temperature. As soon as this is reversed, fuel gas injection stops and only air flowing through the air supply box flows into the heat storage chamber and the combustion chamber.

The structure of the apparatus for raising the combustion chamber in the coke oven with reference to FIG. 2 is as follows.

The temperature raising device is a gas supply line (30,31) provided separately from the mixed gas supply duct 15, and a flow connected to the gas supply line and located on the outermost side of the combustion chamber (a short flow for convenience of description below) A heating gas pipe 32 for supplying combustion gas to a burner of the combustion chamber, an air supply line 40 and 41 provided separately from the air supply box 16, and the air supply line. It is connected to and extends to the short flow 20 of the combustion chamber and comprises an air pipe 42 for supplying air.

Here, the heated gas pipe 32 and the air pipe 42 may be installed in all 36 flows forming the combustion chamber, and may be selectively installed only in the single flow 20 located outside the combustion chamber as described below. This is because the outside of the combustion chamber is directly in contact with the outside air, so the temperature drop of the combustion chamber is large.

In the present embodiment, the gas supplied to the combustion chamber through the gas supply lines 30 and 31 is coke oven gas (hereinafter referred to as COG gas). The COG gas has a higher calorific value than the mixed gas supplied to the conventional combustion chamber, thereby further increasing the temperature raising effect. The COG gas can be easily supplied through a conventional COG supply equipment at rest in the steel mill.

In addition, the temperature rising device is a reversing unit for controlling the operation of the supply of gas and air flowing through the temperature rising gas pipe 32 and the air pipe 42 in accordance with the alternating operating conditions of the combustion chamber, and the temperature rising gas pipe 32 And a residual gas removal unit for supplying air into the air to blow out the residual gas into the combustion chamber to prevent carbon generation by the residual gas.

Hereinafter, each component will be described in more detail with reference to FIG. 3.

In the present embodiment, the gas supply lines 30 and 31 are paired with each other in consideration of the reversing operation of the combustion chamber. The air supply lines 40 and 41 are also provided in pairs according to the reversing operation of the combustion chamber.

The reversing unit is provided on each gas supply line (30, 31) and each air supply line (40, 41), respectively, the electric valve (50, 51, 52, 53) for opening and closing the line, and each of the electric valve And a reversing winch 54 for controlling operation.

As the electric valve is opened and closed by the reversing winch 54, the corresponding gas supply line and the air supply line are opened to distribute gas or air.

Here, the gas supply lines 30 and 31 are connected to the COG gas supply facility, and on the line connecting the gas supply line and the COG gas supply facility, the mist eliminator 60 and the gas depressurization for removing the foreign matter contained in the COG gas are removed. A reducing valve 61 and a gas flow meter 62 capable of knowing an individual gas flow rate are installed.

The air supply line (40, 41) is connected through a line and a separate air supply facility provided on the line connecting the air supply line and the air supply facility to reduce the flow rate of the reducing valve 64 and air for reducing the air A known air flow meter 65 is installed.

The gas flow meter 63 and the air flow meter 65 are connected to a control unit 70 for controlling the apparatus so as to apply a detection signal according to a gas or air supply amount to the control unit, and the control unit 70 is the river. It is connected to the single winch 54 to control the respective electric valve (50, 51, 52, 53) according to the gas or air supply amount.

In addition, the residual gas removing unit is for preventing carbon generation by pyrolysis in the temperature rising gas pipe 32 by removing the gas remaining in the temperature rising gas pipe 32 when the supply of the gas is cut off.

To this end, the residual gas removing unit includes an inner tube 81 and an outer tube 82 surrounding the inner tube 81 and extends to the short flow 20 of the combustion chamber. ) Is connected to distribute the gas, and the outer pipe 82 is connected to the air pipe 42 is connected to the double pipe 80 and the air supply line, and connected to the air supply line 40 of the double pipe 80 It is connected to the inner tube 81 includes an air inlet tube 83 for supplying air to the inner tube 81 of the double tube 80 at the reversing time.

Unexplained reference numeral 84 is a union for detachably connecting the elevated gas pipe 32 and the air pipe 42 and the air input pipe to the double pipe (80).

When the COG gas is supplied to the combustion chamber through the elevated gas pipe 32 and reversed to the next alternate combustion time, the supply of the COG gas is interrupted, and the temperature is raised through the air inlet pipe 83 connected to the air supply line 40. Air is supplied to the inner pipe 81 of the gas pipe 32 to push out the remaining COG gas remaining in the pipe into the combustion chamber. Therefore, it is possible to prevent the generation of carbon by thermal decomposition in the COG supply system. This process is repeated according to the alternating operation of the combustion chamber.

The operation of the apparatus will be described below.

In order to increase the temperature of the single flow 20 located at both ends of the combustion chamber, COG gas is additionally supplied to the single flow 20 of the combustion chamber in accordance with a reversing time operated alternately every 20 minutes.

That is, in response to the control signal of the control unit 70, the reversing winch 54 opens and operates the electric valves 50 and 53 installed at one gas supply line 30 and one air supply line 41 and the remaining gas supply line. 31 and the electric valves (51, 52) installed in the air supply line 40 is closed.

The COG gas is supplied to the burner of the combustion chamber through the inner pipe 81 of the double pipe 80 through the elevated gas pipe 32 connected to the open gas supply line 30. Similarly, air is supplied to the combustion chamber along the outer pipe 82 of the double pipe 80 through the air pipe 42 connected to the open air supply line 41.

Accordingly, the COG gas is additionally supplied and combusted to the single flow 20 located at both side ends of the combustion chamber, thereby increasing the temperature of the single flow. The input flow rate of the COG gas and air for raising the temperature of the short flow is measured by each flow meter (63, 65) installed on the line and applied to the controller 70. Accordingly, the control unit 70 calculates a value required for the temperature increase through the measured flow rate to automatically control each flow rate.

In this case, when the temperature rise process lasts 20 minutes and the alternate combustion time is reached, the reversing winch 54 closes the open electric valves 50 and 53 according to the control signal of the controller 70 and is closed. The electric valves 51 and 52 are opened. As soon as this is reversed, the COG gas injection stops and only the air flowing through the air supply box flows into the heat storage chamber and the combustion chamber.

Therefore, in FIG. 3, the gas supply to the heated gas pipe 32 is cut off, and the supply of air through the air pipe 42 is also cut off.

As the electric valve 52 installed in the other air supply line 40 is opened, air is supplied through the air input line 83 connected to the air supply line 40.

The air supplied as described above is introduced into the inner tube 81 of the elevated gas pipe 32 to push out the COG gas remaining in the pipe into the combustion chamber. As a result, carbon generation due to thermal decomposition can be prevented by the COG gas remaining in the tube.

The above process is automatically controlled by the control unit 70, the state of each combustion chamber is output to the control unit, the control unit always monitors the presence of combustion abnormalities.

4 is a graph showing a temperature increase state of the single flow located at the outermost side of each single flow of the combustion chamber through the above process.

As can be seen in FIG. 4, the present embodiment can increase the temperature of the single flow as compared with the conventional through additional supply of COG gas.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the range of.

1 is a schematic cross-sectional view showing a coke oven according to an embodiment of the present invention.

2 is a schematic perspective view showing a combustion chamber temperature raising apparatus of a coke oven according to an embodiment of the present invention.

3 is a schematic diagram illustrating a configuration of a coke oven combustion chamber temperature raising apparatus according to an embodiment of the present invention.

Figure 4 is a graph showing the temperature increase state of the combustion chamber compared with the prior art according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10 coke oven 11: carbonization chamber

12: combustion chamber 20: single flow

30,31: Gas supply line 32: elevated gas pipe

40,41: Air supply line 42: Air pipe

50, 51, 52, 53: electric valve 54: reversing winch

70 control unit 80 double pipe

81: inner tube 82: outer tube

83: air input pipe 84: Union

Claims (8)

A combustion chamber having a plurality of flows for coke distillation charged in the carbonization chamber, Mixed gas supply duct for supplying a mixed gas for combustion to a burner installed in each flow of the combustion chamber, An air supply box for supplying air to the flow of the combustion chamber; A gas supply line provided separately from the mixed gas supply duct; A heated gas pipe connected to the gas supply line and extended to the flow of the combustion chamber to supply additional gas for combustion. An air supply line provided separately from the air supply box to supply air; An air pipe connected to the air supply line and extending to a flow of the combustion chamber to supply air Coke oven combustion chamber heating apparatus comprising a. The method of claim 1, The temperature raising gas pipe is a coke oven combustion chamber heating apparatus connected to the flow at both ends of each flow constituting the combustion chamber. The method of claim 1, The gas supply line is a coke oven combustion chamber heating apparatus for supplying coke oven gas (COG). delete The method of claim 1, And a reversing unit for controlling the operation of supplying the gas and the air flowing into the heated gas pipe and the air pipe according to alternating operating conditions of the combustion chamber. The method of claim 1, And a residual gas removal unit for supplying air into the temperature rising gas pipe to eject residual gas into the combustion chamber. The method of claim 5, The reversing unit includes a pair of gas supply lines and a pair of air supply lines provided in accordance with alternating operating conditions of the combustion chamber, electric valves installed at each line to open and close lines, and a reversing winch for controlling and operating the electric valves. Coke oven combustion chamber heating apparatus comprising. The method of claim 6, The remaining gas removing unit is composed of an inner tube and an outer tube surrounding the inner tube and extends to the flow of the combustion chamber, and an inner tube is connected to the elevated gas tube to distribute gas, and an outer tube is connected to the air tube to distribute air. A coke oven combustion chamber heating apparatus comprising a double pipe and an air inlet pipe connected to the air supply line and connected to the inner pipe of the double pipe to supply air to the inner pipe of the double pipe during the reversing time.

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