JP2006321963A - Method for operating coke oven in which in-oven gas combustion chamber is disposed on carbonization oven side of oven lid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for operating a coke oven, increasing the carbonization rate of coal particles 2 charged on the carbonization oven side in an in-oven gas combustion chamber 13 attached to the carbonization oven side of the oven lid 3, and preventing the overheating and small explosion phenomenon of the coal particles 3 due to the supply of an unnecessary amount of air. <P>SOLUTION: This operation method is characterized by closing an air-supplying valve 18 connected to the air-supplying side of an in-oven gas combustion air supply amount-controlling nozzle 17 disposed on the carbonization oven side of the oven lid 3 from the coke carbonization oven 1 for carbonizing the coal particles 2 and used for supplying air in an amount necessary for burning an in-oven gas flowed in the in-oven gas combustion chamber 13, in a carbonization end time when H<SB>2</SB>gas component in the in-oven gas flowed in the carbonization oven 1 or the in-oven gas combustion chamber 13 rapidly increases or when CH<SB>4</SB>gas rapidly decreases. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an operation of a coke oven in which an in-furnace gas combustion chamber is provided via a heat insulating box on the carbonization furnace side of a furnace lid structure that opens and closes the inlet / outlet of a coking chamber (furnace) of a coke oven for carbonizing coal particles. It is about the method.

  The furnace lid that opens and closes the entrance and exit of the carbonization furnace for carbonizing coal particles charged in the carbonization furnace of the coke oven is heat-resistant sealed with a large refractory brick lined via a seal plate on the furnace lid structure of a sturdy steel frame Although the structure of the furnace lid is often used, since the refractory brick absorbs high-temperature heat, the coal particles charged in the vicinity of the furnace lid of the carbonization furnace are discharged without reaching the dry distillation temperature. Accordingly, undistilled defective coke is mixed into high-quality dry-distilled coke, which causes a problem of deteriorating coke quality and reducing coke productivity. As disclosed in Japanese Patent Publication No. 3-40074, a furnace lid developed to solve this problem is a "hot gas in-furnace gas generated from a carbonization furnace via a thermal insulator in the furnace lid structure. However, when rising up the vertical passage of the thermally conductive metal partition wall in contact with the coal particles and flowing into the air pipe, the coal particles charged on the furnace lid side are heated via the thermally conductive metal partition body. It is a furnace lid.

Further, in order to further increase the carbonization rate of the coal particles charged to the furnace lid side, as disclosed in, for example, Utility Model Registration No. 2953319 and Japanese Patent Laid-Open No. 8-283735, the “carbonization furnace of the furnace lid structure” In order to burn the furnace gas that has flowed into the gas passage through the gap between the heat-resistant members in which the gas passage is formed in the vertical direction on the side, an air nozzle is connected to the gas passage via an on-off valve or an air blowing branch pipe An ignition device such as an ignition plug is installed at the tip of the gas, and air is blown in from 2 hours after charging or after 10 hours from the start of carbonization until the time of fire (end of carbonization) or 20 hours, and the gas passage temperature is 800 ° C or higher. The coke oven operation method is Although such an operating method improves the productivity and quality of coke, depending on the degree of opening of the on-off valve, a larger amount of air than the amount of gas flowing into the furnace is supplied to the gas passage. There was also a risk of overheating the charged coal particles and causing a small explosion in the small gas passage in the furnace.
Japanese Patent Publication No. 3-40074 (column 1) Utility Model Registration No. 2953319 (columns 7, 8) JP-A-8-283735 (columns 4, 5 and 6)

The inventors of the present invention described in the above Japanese Patent Publication No. 3-40074 “Thermal Conductive Metal Partition” or Utility Model Registration No. 2953319 is “a heat-resistant member in which a gas passage is formed in a vertical direction”. "In-furnace gas recirculation chamber in which gas flow gaps are provided vertically and horizontally through a heat insulation box inside the furnace of the furnace lid structure", such as Japanese Patent Application Laid-Open No. 2004-43753 and 2004-99859, In order to provide a coke oven operation method that prevents overheating and small explosions of coal particles due to the supply of an unnecessary amount of air. The relationship between coal carbonization time (carbonization temperature), furnace gas generation behavior and furnace gas composition was investigated. As a result, a large amount of furnace gas composed of many gas compositions such as CH ₄ and CO ₂ is generated at the initial stage of dry distillation and the calorific value is high, but the amount of generated gas in the furnace gradually decreases after the middle stage of dry distillation. is also high calorific value at a content of many CH ₄ amount was finding that corresponding to between sharply reduced fire落時the heating value with CH ₄ generation is increased in becomes the carbonization end H _2. Regardless of the amount of CH ₄ contained in the furnace gas, air or oxygen is introduced into the gas passage, that is, the furnace gas combustion chamber, as described in Japanese Utility Model Registration No. 2953319 and Japanese Patent Laid-Open No. 8-283735. It was found that blowing into the dark clouds brought the atmosphere close to the environment that caused the explosion without burning the furnace gas, and overheated the coke that had undergone dry distillation, causing ash differentiation. Further, the present inventors stopped the air blowing when the H ₂ gas component in the furnace gas at the end of the dry distillation period of coal particles suddenly increased and the CH ₄ gas rapidly decreased, thereby causing the above-mentioned problem. The present inventors have also found that the above-described present invention can perform the intended coke operation.

The present invention is configured on the basis of this knowledge, and the gist of the present invention is that the in-furnace gas flowing into the in-furnace gas combustion chamber provided on the side of the carbonization furnace of the furnace lid from the carbonization furnace of the coke oven for carbonizing coal particles. The H ₂ gas component in the furnace gas of the carbonization furnace or furnace gas combustion chamber increases abruptly when the air supply valve of the air supply control nozzle for combustion gas combustion that supplies the amount of air required for combustion is used. This is a method for operating a coke oven in which an in-furnace gas combustion chamber is provided on the carbonization furnace side of the furnace lid, which is closed at the beginning of the end of the dry distillation period in which the CH ₄ gas component rapidly decreases.

  The method of operating a coke oven according to the present invention includes an air supply valve that blows in an amount of air necessary to burn the in-furnace gas flowing into the in-furnace gas combustion chamber provided on the carbonization furnace side of the furnace lid. The temperature of the in-furnace gas combustion chamber is increased to increase the carbonization rate of the coal particles charged to the furnace lid side, thereby increasing the production yield of the dry distillation coke. The tar that inhibits the adhesion to the lid is burned and disappears. Furthermore, since the present invention detects the composition change of the in-furnace gas that has become difficult to burn and stops the blowing of air, it is possible to prevent the overheating of the dry distillation coke and the small explosion phenomenon at the end of the dry distillation.

Hereinafter, the method of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view of a carbonization furnace lid in which the inlet / outlet on the coke discharge side (or coke extrusion side) of the carbonization furnace is closed and its vicinity, and is an embodiment presented for easy understanding of the method of the present invention. It is an example. Reference numeral 1 denotes a carbonization furnace in which coal particles 2 are charged. That is, the carbonization furnace 1 is provided in a furnace structure that heats the coal particles 2 and dry-distills them with heating furnaces (not shown) provided adjacent to both sides. 3 is a carbonization furnace lid. The carbonization furnace lid 3 includes a slide plate 6 and a flange member 7 having a knife edge cross-sectional shape on the carbonization furnace side of a sturdy steel furnace lid frame 5 manufactured to have a fastening function structure that presses the furnace opening frame 4 of the carbonization furnace 1. A heat-resistant metal seal plate 8 that contacts the furnace opening frame 4 of the carbonization furnace 1 and a furnace internal plate 9 are provided around the carbonization furnace so that the inside of the carbonization furnace is hermetically maintained, and alumina silicate, ceramic fiber, etc. An in-furnace gas combustion chamber 13 protruding from the inlet / outlet 12 of the carbonization furnace 1 is provided through a heat insulating box 11 filled with a heat insulating material 10 generally used. The in-furnace gas combustion chamber 13 is a refractory metal having gas flow gaps or gas flow holes on the front surface, side surface, or both surfaces so that the gas in the furnace generated when the coal particles 2 are carbonized in the carbonization furnace 1 can easily flow. For example, as shown in the figure, a heat-resistant metal strip plate 15 is placed on the left and right or top and bottom sides of a horizontal support frame 14 in which a heat insulation box 11 is fixed at a position where the furnace height direction is divided into a plurality of stages. Or the structure which provided the gas distribution | circulation clearance gap 16 in both and erected vertically and horizontally using the detachable engaging means may be sufficient. The in-furnace gas combustion chamber 13 is provided with gas flow gaps on the upper and lower sides of a large number of refractory metal frames formed in an annular shape or a discontinuous annular shape, and is laid horizontally in a multistage manner. It may be a hollow structure of a strip frame inclined high. That is, in the present invention, the in-furnace gas combustion chamber 13 is provided in the in-furnace gas flow structure of the frame structure into which the in-furnace gas flows, and the shape and structure thereof are not particularly limited. Reference numeral 17 denotes an in-furnace gas combustion air supply amount control nozzle. Reference numeral 18 denotes an air supply valve such as a screw-in spherical valve (metal touch ball valve) or a butterfly valve (damper valve). That is, the in-furnace gas combustion air supply amount control nozzle 17 sucks in an amount of air necessary for burning the in-furnace gas flowing into the in-furnace gas combustion chamber 13 and connects the air supply valve 18 to connect the air induction pipe 19. In the furnace gas combustion chamber 13, one unit or two or more units are attached to the in-furnace gas combustion chamber 13 at an arbitrary interval in the height direction of the carbonization furnace lid 3. The structure of the air supply amount control nozzle 17 for in-furnace gas combustion is not particularly limited in the method of the present invention. As in the above-mentioned Japanese Patent Laid-Open No. 8-283735, the air passage is connected to the gas passage through the open / close valve. It may be a conventional blowing nozzle that communicates. 20 is a bag. The rod 20 presses and fastens the carbonization furnace lid 3 so as to contact the furnace opening frame 4 and is manufactured by combining fastening members such as a compression spring and a screw bolt.

In the coke carbonization furnace configured as described above, the carbonization furnace lid 3 is closed through the interposition member such as the seal plate 8 at the inlet / outlet 12 of the carbonization furnace 1 as in the conventional coke carbonization furnace described above. After the carbonization furnace 1 is kept airtight, the coal particles 2 are charged into the carbonization furnace 1. The coal particles 2 charged in the carbonization furnace 1 generate a large amount of gas such as H ₂ , CH ₄ , C ₂ H ₆ , CO, CO ₂ while being carbonized with high-temperature heat supplied from an adjacent heating furnace. A part thereof flows into the in-furnace gas combustion chamber 13. The method of the present invention is a coke operation method in which an amount of air necessary for burning the combustible gas in the furnace gas that has flowed into the furnace gas combustion chamber 13 is supplied and burned. While detecting the gas behavior with a gas pressure gauge and gas analyzer, the temperature of coal particles near the furnace lid is raised by the combustion heat to promote dry distillation. As the dry distillation time elapses, the amount of gas generated gradually decreases, and the amount of gas flowing into the furnace gas combustion chamber 13 also decreases. At the end of the dry distillation period, the H ₂ gas component in the furnace gas flowing into the furnace gas combustion chamber 13 increases rapidly, and the CH ₄ gas decreases rapidly on the contrary. Such a change in the gas composition is detected and it is determined that the end of the dry distillation period, and the air supply valve 18 is immediately closed or the change in the gas composition is noticed to be completely closed and the gas combustion chamber 13 in the furnace is closed. Stop supplying air to the unit. Thus, since the supply of air is stopped while detecting the composition change of the gas in the furnace, it is possible to prevent overheating of coal particles and a small explosion phenomenon at the end of the dry distillation.

Next, examples of the method of the present invention will be described.
After closing the inlet / outlet 12 of the carbonization furnace 1 (furnace height 6.7 m, furnace width 430 mm, furnace length 15.8 m) of the coke oven as shown in FIG. 1 with the carbonization furnace lid 3, the coal particles 2 are charged, Immediately started carbonization. From carbonization initial pressure after 4 hours after start of the dry distillation in the 10 hours after the 10 mm H ₂ O of about negative pressure area was reduced to 2mmH ₂ O of about negative pressure area, further boundary negative pressure area of 5mmH ₂ O before and after after 14 hours In a situation where pressure changes over both positive and negative regions are repeated, an amount of air corresponding to the negative pressure is supplied from the in-furnace gas combustion air supply amount control nozzle 17 through the air supply valve 18 and the furnace. Combustion that flows into the in-furnace gas combustion chamber 13 by burning the in-furnace gas that has flowed into the inner gas combustion chamber 13, and promoting the heating of the coal particles 2 charged near the furnace lid through the in-furnace gas combustion chamber 13. Coke operation was performed while analyzing the gas composition of the previous furnace gas. After 17 hours from the start of carbonization, the H ₂ gas component in the furnace gas rapidly increased and the CH ₄ gas component rapidly decreased, and the air supply valve 18 was turned on 1 hour after the change became stable. Clamping was stopped and the air supply was stopped.

  As a result, the coke operation method according to the present invention increases the heating rate of the coal particles charged on the furnace lid side to increase the production yield of dry distillation coke and inhibits the adhesion between the coke oven mouth frame and the furnace lid. In addition to the effect of burning and disappearing tar, it was recognized that overheating of the dry distillation coke and the small explosion phenomenon occurring at the end of dry distillation were prevented.

  With the worldwide shortage of coke supply and the aging of coke ovens accelerating, the coke yield is improved and the damage to the furnace body due to the small explosion phenomenon is prevented. There is a possibility that it will be put to practical use as an effective coke operation method.

FIG. 2 is a cross-sectional view of the coke oven showing the carbonization furnace lid and its vicinity in which the inlet / outlet on the coke discharge side (or coke extrusion side) of the carbonization chamber (furnace) is closed.

Sign theory 3

DESCRIPTION OF SYMBOLS 1 Carbonization furnace 2 Coal particle 3 Furnace lid 4 Furnace frame 13 Furnace gas combustion chamber 17 Air supply control nozzle 18 for gas combustion in a furnace 18 Air supply valve

Claims (1)

In-furnace gas combustion air supply for supplying the necessary amount of air to burn the in-furnace gas flowing into the in-furnace gas combustion chamber provided on the carbonization furnace side of the furnace cover from the carbonization furnace of coke for carbonizing coal particles The air supply valve of the quantity control nozzle is closed at the beginning of the dry distillation period when the H ₂ gas component in the furnace gas flowing into the furnace gas combustion chamber from the carbonization furnace increases rapidly and the CH ₄ gas component decreases rapidly. A method for operating a coke carbonization furnace in which an in-furnace gas combustion chamber is provided on the carbonization furnace side of the furnace lid, characterized by tightening.

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