JP5020656B2 - Coke oven combustion method and combustion apparatus - Google Patents

Description

  The present invention relates to a combustion method and combustion apparatus for a coke oven that adjusts the flow rate of air in the coke oven.

  In general, a coke oven forms one furnace by a pair of carbonization chambers and combustion chambers arranged in a plurality of rows alternately in the furnace width direction (furnace group direction), and usually 50 to 100 furnaces gather to form one furnace. A group is formed. Each combustion chamber is adjacent to the carbonization chamber via a furnace wall (brick wall) and is partitioned into 20 to 30 small combustion chambers in the furnace length direction, and the bottom of each small combustion chamber is a heat storage chamber. (Patent Document 1, FIG. 1).

  Each small combustion chamber is supplied with fuel gas and air preheated in the heat storage chamber for preheating, and by these combustion, the carbonization chambers on both sides are heated through the furnace wall, and dry distillation of coal is performed. The exhaust gas generated in each small combustion chamber is pulled down to the heat recovery heat storage chamber and recovered, and the exhaust gas discharged to the horizontal flame path (sole flue) provided at the bottom of the furnace is located at the front and rear of the furnace. It is distributed and discharged from the chimney to the atmosphere. The heat storage chamber for preheating and the heat storage chamber for heat recovery are alternately switched at a control cycle of, for example, 20 minutes or 30 minutes. The preheating heat storage chamber is referred to as the “standing side”, and the heat recovery heat storage chamber is referred to as the “pulling side”.

  In addition, as a method of operating a coke oven in which the combustion temperature in the height direction of the combustion chamber is made uniform, local high-temperature combustion is eliminated, and NOx in the combustion exhaust gas is reduced, part of the combustion air is removed from the bottom. There has been proposed a multistage combustion system that supplies from one place or a plurality of places in the height direction (Patent Document 2).

  FIG. 2 shows a combustion apparatus for a coke oven that employs the above-described multistage combustion method. (A) and (b) show the same small combustion chamber 21-1. 2, the small combustion chamber 21 is partitioned into a first combustion chamber portion 23 and a second combustion chamber portion 24 by a partition wall 22 having a gap between the small combustion chamber 21 and the ceiling wall surface. FIG. 2A shows a case where the first combustion chamber portion 23 is a standing combustion chamber portion, and FIG. 2B shows a case where the first combustion chamber portion 23 is a pulling combustion chamber portion. In addition, combustion air can be supplied to the first combustion chamber portion 23 and the second combustion chamber portion 24 from a plurality of locations in the bottom and height directions by a bottom air supply system 25 and a multistage air supply system 26, respectively. When the first combustion chamber portion 23 is the standing side, the bottom air supply system and the multistage air supply system on the second combustion chamber portion 24 side that is the pulling side are used as the exhaust gas discharge system.

A first heat storage chamber 27 is disposed below the first combustion chamber 23 and a second heat storage chamber (not shown) is disposed below the second combustion chamber 24 to correspond to the first heat storage chamber. 27 is supplied with air from the furnace bottom (bottom) side first sole flue 28 through the sole flue-heat storage chamber communication hole 30, and the second heat storage chamber has a furnace bottom (bottom) side second sole ( not shown ) . Similarly, air is supplied from the flue through the sole flue-heat storage chamber communication hole. The first heat storage chamber 27 is connected to the bottom air supply system 25 and the multistage air supply system 26 for the first combustion chamber section 23, and high-temperature air is supplied into the first combustion chamber section 23. In addition, fuel gas can be supplied to the first combustion chamber portion 23 and the second combustion chamber portion 24, and the fuel gas is supplied to the first combustion chamber portion 23 when the first combustion chamber portion 23 is set to the standing side. It is supplied to the inside and burned by mixing with combustion air, and then rises to heat the furnace wall.

  The combustion exhaust gas passes through the second heat storage chamber on the pulling side from the bottom air discharge system and the multistage air discharge system through the second combustion chamber portion 24 on the pulling side, bypassing the partition wall 22 as indicated by an arrow. Then, it is discharged to the furnace bottom side second sole flue that becomes the pulling side.

  The furnace bottom side first sole flue 28 is connected to a flue (not shown) via a first change valve 29. Similarly, the furnace bottom side second sole flue 28 is also connected to a second change valve via a flue (not shown). (Not shown) and these flues are connected to the chimney.

When the first combustion chamber 23 is used on the standing side, the first change valve 29 is maintained in a closed state, and combustion air is supplied to the first heat storage chamber 27, so that the second combustion chamber 24 is When used on the pulling side, the second change valve is maintained in an open state, and exhaust gas that has passed through the second heat storage chamber is discharged from the chimney to the atmosphere.

  As shown in FIG. 2B, when the first combustion chamber 23 is used as the pulling side, the first change valve 29 is opened.

On the other hand, in Patent Document 2, it is desirable to operate with the combustion air amount supplied from the bottom part being 50% or more of the total supply air amount, but the combustion supplied from the bottom air outlet hole and the multistage air outlet hole As a method of adjusting the ratio of the working air amount to a required ratio, as shown in FIGS. 3A and 3B, slide bricks 32 and 34 are provided in the bottom air blowing hole 31 and the multistage air blowing holes 33 of the combustion chamber. A method of adjusting the opening area of the air blowing holes 31 and 33 by sliding the slide bricks 32 and 34 has been proposed. Specifically, as shown in FIG. It has been proposed to insert the slide brick opening adjustment rod 34 from the top to the slide bricks 32 and 33 and to operate the slide brick opening adjustment rod 34 to slide the slide brick.
JP 11-035944 A JP 2000-351975 A

By the way, in order to adjust the ratio of the amount of combustion air supplied from the bottom air blowing holes and the multistage air blowing holes to a required ratio, the slide brick 32 with respect to the bottom air blowing holes 31 and the multistage air blowing holes 33 of the combustion chamber. , 34 have been pointed out as having problems such as poor workability as described below, and adjustment work was actually difficult.
1 The operator operates the slide brick opening adjustment rod 34 at the top of the combustion chamber at about 1000 ° C. This operation is performed remotely, and the slide brick opening adjustment rod 34 inserted into the high temperature combustion chamber. Because it becomes soft, fine adjustment is not possible.
2 The adjustment work is in a high temperature environment and is a heavy work.
3 Because the temperature in the combustion chamber is high, the slide brick and the wall are seized, making it difficult to adjust the opening, and there is a risk of brick damage if adjusted forcibly.

  The present invention solves such a conventional problem and reliably adjusts the ratio of the amount of combustion air supplied from the bottom air blowing holes and the multistage air blowing holes to a required ratio without requiring heavy work. It is an object of the present invention to provide a combustion method and combustion apparatus for a coke oven that can perform the above.

The present invention solves the above technical problem, and the gist of the invention is as follows.
(1) In the combustion method of a coke oven in which combustion is performed by alternately switching the two combustion chamber portions each having the air blowing holes at the bottom portion and the multistage positions in the height direction between the standing side and the pulling side, Combustion air having a flow rate adjusted from separate heat storage chambers is supplied to the air blowing holes at different stages in the height direction from the bottom to the chamber, and the bottom air blowing holes are supplied from the combustion chamber on the pull side. The exhaust gas is discharged from the bottom side heat storage chamber through the bottom side sole flue, and the flue gas is discharged from the air blowing holes at the multistage position through the multistage side heat storage chamber and the multistage side sole flue. The flow rate ratio of the exhaust gas drawn down to the heat storage chamber and the multistage side heat storage chamber is adjusted to the flow rate ratio of the combustion air supplied to the heat storage chamber for the bottom air outlet and the heat storage chamber for the multistage air outlet. Features Combustion method of the coke oven.
(2) A combustion chamber of a coke oven that performs combustion by alternately switching two combustion chamber portions each having air blowing holes at the bottom portion and multi-stage positions in different height directions to a standing side and a pulling side, and each of the combustion chambers bottom side regenerators communicating on the bottom side air outlet hole parts, and a multi-stage-side air and the multi-stage-side heat storage chamber communicating with the outlet hole, leading separately to the bottom side regenerator and multistage side regenerator for the one combustion chamber bottom Side first sole flue, multi-stage side first sole flue, bottom- side second sole flue and multi-stage side second sole flue that separately communicate with the other combustion chamber portion bottom- side heat storage chamber and multi-stage side heat storage chamber And exhaust gas flow rate adjusting means provided on the discharge side of the bottom side first sole flue, the multistage side first sole flue, the bottom side second sole flue, and the multistage side second sole flue, respectively, Side combustion chamber The bottom side regenerator and in accordance with the flow ratio of the combustion air supplied to the multi-stage side regenerator, coke oven of the combustion apparatus, characterized in that to adjust the exhaust gas flow rate adjusting means pulling side.

According to the present invention, it is possible to easily adjust the amount of air for combustion from the bottom of the combustion chamber and the multistage position to the flow rate ratio required to achieve low NOx without reducing the thermal efficiency.

  Hereinafter, the present invention will be described based on embodiments shown in the drawings.

FIG. 1 is a schematic view showing an embodiment of a combustion apparatus for a coke oven to which the present invention is applied. (A) and (b) are the same small combustion chambers 21-1... As in the conventional example shown in FIG. ... 21-n is shown separated into a standing side and a pulling side, and the small combustion chamber 21 is partitioned into a first combustion chamber portion 23 and a second combustion chamber portion 24 by a partition wall 22, and the first combustion is performed. The configuration in which the chamber portion 23 and the second combustion chamber portion 24 are respectively provided with a bottom air blowing hole and a multistage air blowing hole is the same as the conventional example shown in FIG. Incidentally, FIG. 1 (a) when the trailing-side combustion chamber portion of the first combustion chamber part 2 3, FIG. 1 (b) shows the case of a pull-side combustion chamber portion of the second combustion chamber 24.

  In the first embodiment, the first combustion chamber portion 23 is provided separately with the furnace bottom side first heat storage chamber 1 for the bottom air blowing holes and the multistage side first heat storage chamber 2 for the multistage air blowing holes. In addition, in the second combustion chamber section 24, a furnace bottom side second heat storage chamber 3 for the bottom air outlet hole and a multistage second heat storage chamber 4 for the multistage air outlet holes are separately provided.

In addition, two sole flues 5 and 6 are provided for the first combustion chamber portion 23, and the furnace bottom (bottom) side first sole flue 5 is connected to the furnace bottom (bottom) side first through the sole flue-heat storage chamber communication hole 30. The first heat storage chamber 1 is connected, and the first multi-stage sole sole 6 is connected to the first multi-stage heat storage chamber 2 via a sole-heat storage chamber communication hole 30.

Similarly, two sole flues 7 and 8 are provided for the second combustion chamber portion 24, and the second sole flue 7 on the furnace bottom (bottom) side is disposed on the furnace bottom (bottom) side via the sole flue-heat storage chamber communication hole 30. Connected to the second heat storage chamber 3, the multistage-side second sole flue 8 is connected to the multistage-side second heat storage chamber 4 via the sole flue-heat storage chamber communication hole 30.

  The discharge end portions of the furnace bottom side first sole flue 5 and the multistage side first sole flue 6 merge and are connected to the first change valve 9, and the furnace bottom side second sole flue 7 and the multistage side second sole flue 8 The discharge ends join together and are connected to the second change valve 10 and further connected to the chimney via the flue.

  Further, first change valve inlet dampers 11 are provided at the discharge end portions of the furnace bottom side first sole flue 5 and the multistage side first sole flue 6 respectively, and the furnace bottom side second sole flue 7 and the multistage side second sole are provided. A second change valve inlet damper 12 is provided at the discharge end portion of the flue 8 so that the flow rate of the exhaust gas can be adjusted.

  Further, a bottom air supply system 25 for the first combustion chamber portion 23 is connected to the furnace bottom side first heat storage chamber 1, and a multistage air supply system for the first combustion chamber portion 23 is connected to the multistage first heat storage chamber 2. 26, a bottom air supply system 25 for the second combustion chamber 24 is connected to the furnace bottom side second heat storage chamber 3, and a multistage for the second combustion chamber portion 24 is connected to the multistage second heat storage chamber 4. An air supply system 26 is connected.

  In the present embodiment, the combustion air flowing through the furnace bottom side first sole flue 5 and the multistage side first sole flue 6 adjusts the valve opening degree of the main valve composed of a flow adjustment cock (not shown). Thus, the amount of combustion air supplied into the first combustion chamber portion 23 is separately adjusted and supplied from the bottom air outlet hole and the multistage air outlet holes at a flow rate ratio required to achieve low NOx. Can do.

  When the first combustion chamber portion 23 is set to the standing side, the combustion air passes through the furnace bottom-side first heat storage chamber 1 and the multistage-side first heat storage chamber 2 and is heated to a high temperature to supply bottom air at an arbitrary flow rate. The gas is supplied into the first combustion chamber 23 through the system 25 and the multistage air supply system 26. In this case, each of the second change valve inlet dampers 12 is controlled so that the flow rate ratio of the exhaust gas flowing through the furnace bottom side second sole flue 7 and the multistage second sole flue 8 matches the flow rate ratio of the combustion air described above. Each opening is adjusted. This is the first attached to the furnace bottom side first sole flue 5 and the multistage side first sole flue 6 leading to the first combustion chamber portion 23 which is the pulling side when the second combustion chamber portion 24 is the standing side. This also applies to the change valve inlet damper 11.

  In the present embodiment, combustion is switched for the first combustion chamber portion 23 and the second combustion chamber portion 24 at regular intervals, and fuel gas and air and combustion exhaust gas are switched between the standing side and the pulling side. . In FIG. 1, the heat storage chambers 1 and 2 on the pulling side before switching store sensible heat held in the combustion exhaust gas, and preheat the combustion air on the standing furnace bottom side and the multistage side after switching, respectively. At this time, the ratio of the air flow rate flowing into the standing-side furnace bottom side first heat storage chamber 1 and the multi-stage side first heat storage chamber 2, and the furnace bottom side first heat storage chamber 1 and the multi-stage side at the pulling side If the flow rate ratio of the exhaust gas flowing into the first heat storage chamber 2 is not balanced, the heat exchange rate decreases.

That is, assuming that 60% of combustion air enters the standing furnace bottom side heat storage chamber and 40% enters the multi-stage side heat storage chamber, and after combustion in the combustion chamber, the combustion exhaust gas flows into the pull-down side furnace bottom and multi-stage respectively. When the heat storage chamber is pulled down, the furnace bottom side heat storage chamber has excessive heat removal, and the multistage side has insufficient heat extraction. In this case, there is a possibility that the combustion becomes unstable due to the deterioration of the heat consumption and the insufficient preheating of the combustion air.

  However, in this embodiment, the ratio of the amount of combustion air entering the standing-side furnace bottom-side heat storage chamber and the multistage-side heat storage chamber, and the pull-down side furnace bottom-side heat storage chamber and the multistage-side heat storage chamber are pulled down. Since the flow rate ratio of the combustion exhaust gas is balanced, a high heat exchange rate can be maintained.

It is the schematic which shows the combustion apparatus of the coke oven which shows one Embodiment of this invention, (a) shows the standing side, (b) shows the pulling side. It is the schematic which shows the combustion apparatus of the conventional coke oven, (a) shows the standing side, (b) shows the pulling side. The figure which shows the method of adjusting the ratio of the amount of combustion air supplied from the conventional bottom part air blowing hole and a multistage air blowing hole.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Furnace bottom (bottom part) side 1st thermal storage chamber 2 Multistage side 1st thermal storage chamber 3 Furnace bottom (bottom part) side 2nd thermal storage chamber 4 Multistage side 2nd thermal storage chamber 5 Furnace bottom (bottom part) side 1st sole flue 6 Multistage side First sole flue 7 Furnace bottom (bottom) side second sole flue 8 Multi-stage second sole flue 9 First change valve 10 Second change valve 11 First change valve inlet damper 12 Second change valve inlet damper 21 Combustion chamber 22 partition wall 23 first combustion chamber 24 and the second combustion chamber portion 25 hearth (bottom) air supply system 26 the multi-stage air supply system 27 first regenerator 28 hearth (bottom) side first sole flues 29 reversing valve 30 Sole Flue-Heat Storage Room Communication Hole

Claims (2)

In the combustion method of the coke oven, in which combustion is performed by alternately switching the two combustion chamber portions each having the air blowing holes at the bottom portion and the multistage position in the height direction to the standing side and the pulling side,
Combustion air adjusted in flow rate ratio is supplied from separate heat storage chambers to the air blowing holes at different stages in the height direction from the bottom to the combustion chamber on the standing side, and from the combustion chamber on the pulling side to the bottom Exhaust flue gas is discharged from the air outlet hole through the bottom side heat storage chamber and through the bottom side sole flue, and the flue gas is discharged from the air outlet hole at the multistage position through the multistage side heat storage chamber and through the multistage side sole flue. The flow rate ratio of the exhaust gas drawn down to the bottom side heat storage chamber and the multistage side heat storage chamber is changed to the flow rate ratio of combustion air supplied to the heat storage chamber for the bottom air outlet hole and the heat storage chamber for the multistage air outlet hole. A coke oven combustion method characterized by being combined. A combustion chamber of a coke oven that performs combustion by alternately switching two combustion chamber portions each having air blowing holes at different positions in the bottom portion and in the height direction to a standing side and a pulling side, and a bottom portion of each combustion chamber portion bottom side regenerators leading to the side air discharge holes, and a multi-stage-side air and the multi-stage-side heat storage chamber communicating with the outlet hole, the bottom side first leading separately to the bottom side regenerator and multistage side regenerator for the one combustion chamber portion sole flues, and the multi-stage-side first sole flues and leads separately to the bottom side regenerator and multistage side regenerator for the other combustion chamber bottom side second sole flues, and a multi-stage-side second sole flues, the Combustion on the standing side, comprising a bottom side first sole flue, a multistage side first sole flue, a bottom side second sole flue, and an exhaust gas flow rate adjusting means provided on the discharge side of the multistage side second sole flue, respectively. bottom for the chamber part In accordance with the flow ratio of the combustion air supplied to the side regenerator and multi-side regenerator, combustion apparatus of the coke oven, characterized in that to adjust the exhaust gas flow rate adjusting means pulling side.

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