JP2005048149A - Lid of coke carbonization furnace having combustion chamber for gas generated in the furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the lid of a carbonization furnace having a combustion chamber for a gas generated within the furnace into which a necessary amount of air for combusting the gas generated in the furnace is blown by automatic control without depending on electrical control. <P>SOLUTION: The lid 3 of the carbonization furnace has the combustion chamber 13 for the gas generated within the furnace on the side of the carbonization chamber. The vertical pipe 18 of a T-shaped three-way pipe 17 on the lid has an air inlet opening 20 on one side wall 19 inclining to the inside from the upper side, an air inlet pipe 21 of a slant path having a front end downward outside of the air inlet opening 20 and an air chamber 16 suspended with a downward open closing plate 22 of the air inlet opening 20 in the inside, and an open/close lid for discharging coal dust is installed at the lower end of the vertical pipe 18. Further, an automatic control nozzle 11 for feeding combustion air having a vertical pipe 12 housed in the combustion chamber 13 for the generated gas is installed to the front end of a horizontal pipe 24 through an open/close valve 25 by bringing the upper side to a convergent nozzle 26 for jetting air and the lower side as an opening 27 for falling the coal dust. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

Detailed Description of the Invention

  The present invention relates to a coke carbonization furnace lid having an in-furnace gas combustion chamber on the carbonization furnace side.

A carbonization furnace that produces coke by carbonizing coal particles has a structure that can withstand a high heat temperature of 900 ° C. or higher, and releases CH ₄ and CO generated in the carbonization furnace to deteriorate the working environment and air pollution. For this reason, there is a demand for a coke carbonization furnace lid that has excellent furnace airtightness. Due to such demands, many coke carbonization furnace lids have been developed. Among them, as introduced in Japanese Utility Model Publication No. 5-56940, Japanese Utility Model Publication No. 7-38156, Japanese Patent Application Laid-Open No. 2001-288472, and many other patent publications, the inside of the furnace hearth frame of the steel furnace lid frame for opening and closing operation is provided. Coke carbonization furnace lids are often used that are stacked with large refractory tiles with a thickness of about 400 mm through a steel seal plate that abuts the furnace opening frame of the carbonization furnace to improve the airtightness in the furnace. . Although the lining of a large refractory brick meets the heat resistance requirements, the refractory brick repeatedly absorbs and releases a large amount of heat each time the furnace lid is opened and closed, resulting in energy saving problems and higher airtightness in the furnace. From these problems, new problems to be solved have arisen, such as the problem of producing a large amount of uncooked defective coke from coal particles charged in the vicinity of the furnace lid. Among these problems, as described in Japanese Utility Model Publication No. 2-26913 and Japanese Utility Model Publication No. 6-43146, a furnace lid that improves the airtightness in the furnace, deformation of the furnace lid structural member and generation of tar are not possible. In order to prevent gas leakage of the gas generated in the furnace caused by the cause, coke carbonization provided with a metal shield for the gas passage extending in parallel through the heat insulating material covered with the steel plate along the inside of the carbonization furnace lid A furnace lid has been developed. This furnace lid also has a problem that when the furnace lid frame member is deformed by heat at a high temperature, the knife edge member provided in the peripheral portion of the seal plate is also deformed following, and the sealing performance cannot be maintained for a long time.

  Further, a coke carbonization furnace lid developed for the purpose of solving the problem of energy saving and the occurrence of defective coke has already been disclosed in Japanese Patent Publication No. 3-40074 (filed in 1979). The furnace lid is formed by passing the gas generated in the furnace, which has generated high-temperature heat generated in the carbonization furnace, through the gas passage chamber of the vertical thermally conductive metal partition provided on the carbonization furnace side of the furnace lid. The coal particles charged on the furnace lid side using the thermal conductivity of the partition walls, and not using large refractory bricks. It is an excellent technology in that it tries to use the high-temperature heat it has. However, the gas passage chamber passes not only the gas having a high temperature heat but also the relatively low temperature gas passing through the uncoiled region of the coal particles charged in the bottom of the carbonization furnace on the furnace lid side. There was a problem that the temperature was not increased more than expected and the purpose was not achieved. A method for promoting dry distillation to solve this problem has also been developed. For example, in Japanese Patent Publication No. 5-38795, “a part of the combustible gas generated in the furnace is burned with air or oxygen blown from outside the furnace in a specific gas space, and the temperature of the space is set to 700 to 850 ° C. "Method for promoting dry distillation of coke oven kiln opening held in", Japanese Patent No. 2953319, Japanese Patent Application Laid-Open No. 8-28735, Japanese Patent Application Laid-Open No. 9-53078, etc., "Hollow body provided on carbonization furnace side of furnace lid" A coke oven operating method is disclosed in which the in-furnace gas introduced into the in-furnace gas passage is burned with air blown from a nozzle and the furnace-coal-side coal particles are heated by the combustion heat. However, none of the built-in heating type coke oven lids that have been developed as having such effects has yet been put into practical use.

            Japanese Examined Patent Publication No. 5-38795 (page 1, Fig. 1)             Japanese Patent No. 2953319 (first page, FIG. 2)             JP-A-8-283735 (2nd page, FIG. 5)

Problems to be solved by the invention

  The reason for this is not clear, but from the experiments and examination results of the present inventors, it is estimated that the inside of the furnace passing through the gas passage chamber such as the thermally conductive metal partition chamber or gas space provided on the carbonization furnace side of the furnace lid. While the air is blown into the generated gas with air or oxygen from the nozzle while adjusting the opening of the on-off valve, various types of commercially available operations such as artificial operation or diaphragm valves and solenoid valves with an electric spark ignition device provided at the tip of the nozzle In the combustion method using a valve, if the amount of air blown is too small, the gas generated in the furnace will not be burned, and if it is blown too much, the gas composition of the gas generated in the furnace will be diluted and burned. However, there is a problem that a part of the excessively blown air flows into the carbonization furnace to increase the rate of carbonization and ash differentiation of the coal particles. In addition, a method of spontaneous combustion at a room temperature of 500 ° C. or higher while negatively controlling the pressure of the gas passage chamber is disclosed, but coal dust flowing into the gas passage chamber from a narrow furnace-generated gas inlet port is disclosed. There is a problem in that tar is generated before the temperature is reached and the gas generated in the furnace is blocked. In addition, in the high temperature work environment, blowing air and oxygen into the gas passage chamber of the furnace lid that opens and closes every time the coke kiln is discharged requires electric maintenance and maintenance. Many unresolved problems that cannot be put to practical use, such as coal dust accumulated around the nozzle at the beginning of dry distillation or when air blown is stopped, and tar that is transformed from coal dust flows into the nozzle I think that the.

  As a result of repeating experiments and examinations of prototypes of many types of nozzles with different structures, the present inventors aim to solve unsolved problems in the above-described conventional heating built-in coke carbonization furnace lid, The present inventors have provided a coke carbonization furnace lid having an in-furnace gas combustion chamber capable of injecting an amount of air necessary for combustion of the in-furnace gas without being controlled by electric control.

Means for solving the problem

  The present invention is configured based on the results of this experiment. The gist of the present invention is that a T-shaped three-way pipe is provided outside the carbonization furnace lid that opens and closes the entrance and exit of the carbonization furnace by providing a gas combustion chamber in the furnace on the carbonization furnace side. On the upper end side of the vertical pipe, an air introduction port is provided on one side wall surface inclined from the upper side to the inner side, and an air introduction pipe of an oblique passage with the tip side positioned downward is provided outside through the air introduction port. In addition, an air chamber is provided inside which is suspended a lower opening closing plate that opens and closes the air inlet, and an open lid for discharging coal dust is provided on the lower end side of the vertical pipe, and an open / close valve is provided on the front end side of the horizontal pipe. A combustion air supply self-control nozzle comprising a vertical nozzle pipe connected to the gas generation chamber in the furnace with the upper side as a throttle nozzle for air ejection and the lower side as a coal dust dropping port. Installed gas combustion in the furnace A coke carbonization furnace lid with.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a coke carbonization furnace lid in which a coke extruder side (or coke discharge side) of the carbonization furnace is closed and a carbonization furnace in the vicinity thereof. Show. In FIG. 1, 1 is a carbonization furnace, and the coal particle 2 is charged. That is, the carbonization furnace 1 is configured in a structure in which the coal particles 2 are carbonized by heating furnaces (not shown) adjacent to both sides. 3 is a carbonization furnace lid. The carbonization furnace lid 3 is carbonized by surrounding a slide plate 5 and a flange member 6 having a knife-edge sectional shape on the carbonization furnace side of a furnace lid frame structure 4 having a normal structure for pressing the carbonization furnace 1. A heat-resistant metal seal plate 8 that abuts the furnace port frame 7 of the furnace 1 is laterally crossed, and carbonized through a heat-insulating box 9 in which a metal heat-resistant box is filled with a heat insulating material generally used such as alumina silicate or ceramics. An in-furnace generated gas combustion chamber 13 that houses a vertical nozzle pipe 12 of a combustion air self-control nozzle 11 to be described later is provided at the forefront position protruding to the entrance 10 of the furnace 1. The in-furnace generated gas combustion chamber 13 is manufactured in a heat-resistant hollow structure in which the gas generated from the coal particles 2 during the carbonization in the carbonization furnace 1 is easy to flow. A horizontal plate supporting frame 14 fixed at a position to be divided into two, a heat-resistant metal strip 15 is provided in the left and right or up and down or both, and a minute ventilation gap, that is, a gas flow port is provided in parallel and vertically and horizontally by a detachable engaging means. In addition to the bottomed or bottomless combustion chamber, a combustion chamber having a simple structure in which a gas flow port is provided at an arbitrary position of the heat-resistant metal box may be used. In the present invention, the structure and shape of the in-furnace gas combustion chamber 13 are not particularly limited, but are heat resistant and excellent in gas flowability, and are locally burned or deformed due to overheating or some external impact. However, considering the advantage of being easily repaired and easily restored, it is optimal to use an in-furnace gas combustion chamber having a structure in which heat-resistant metal strips 15 are arranged vertically and horizontally as shown in the figure.

  FIG. 2 is an enlarged view of the combustion air supply self-control nozzle 11 attached to the outer wall surface of the furnace lid frame structure 4 in FIG. 1, partially showing a cross-sectional view. Reference numeral 16 denotes an air chamber. The air chamber 16 is an air storage chamber provided on the upper side of the vertical pipe 18 of the T-shaped three-way pipe 17. The air introduction port 20 is provided on one wall surface 19 inclined from the upper side to the inner side. An air introduction pipe 21 of an oblique passage having the tip side as a lower position is provided on the outer side, and a lower opening closing plate 22 for opening and closing the air introduction port 20 is suspended on the inner side to constitute a box structure. . In other words, the air chamber 16 opens only the clean air and opens the closing plate 22 while dropping the coal dust floating in the air introduced from the vicinity of the furnace lid frame structure 4 in the oblique passage of the air introduction pipe 21. It is provided in the structure introduced by operation. A coal dust discharge opening lid 23 is provided below the vertical pipe 18. The opening lid 23 for discharging the coal dust is used for a cleaner that is opened and closed to remove the coal dust accumulated in the air flow passage when the coal dust mixed in the air introduced from the air chamber 16 closes the vertical pipe 18. It is a lid. Further, the horizontal pipe 24 of the T-shaped three-way pipe 17 is fixed by penetrating a furnace lid member such as the slide plate 5 and the heat insulation box 9 from the furnace lid frame structure 4 side through the opening / closing valve 25, and is provided at the front end side thereof. The vertical nozzle pipe 12 housed in the furnace-generated gas combustion chamber 13 is provided with the upper side being the air ejection throttle nozzle 26 and the lower side being the coal dust dropping port 27. The members of the combustion air supply self-control nozzle 11 such as the T-shaped three-way pipe 17, the air chamber 16, and the open / close valve 25 may be connected by a series of pipes or may be connected via a joint member. Good. Particularly in a coke work environment where there is a lot of coal dust, each member is connected via a screw joint member as shown in FIG. It is preferable to connect the pipe members. That is, in the combustion air supply self-control nozzle 11 according to the present invention, the amount of air necessary for combustion of the in-furnace generated gas flowing into the in-furnace generated gas combustion chamber 13 is reduced by the lower opening blocking plate 22 of the air chamber 16. It is automatically introduced according to the degree of opening, and is sent through the vertical pipe 18 and the horizontal pipe 24 and sent from the air ejection throttle nozzle 26 of the vertical nozzle pipe 12. That is, when the in-furnace generated gas flowing into the in-furnace generated gas combustion chamber 13 is in a combustion state, the combustion gas expands, so that the internal pressure of the in-furnace generated gas combustion chamber 13 is increased, and the opening plate is closed downward. It drives so that 22 may block the air inlet 20, and the introduction of air from the outside is suppressed. On the other hand, when the gas generated in the furnace is in a non-combustion state, the pressure in the furnace generated gas combustion chamber 13 is reduced to a vacuum state, so that the lower opening closing plate 22 is pulled up to open the air inlet 20. Then, an amount of air necessary for burning the gas generated in the furnace is introduced. The combustion air supply self-control nozzle 11 quickly controls the pressure change in the in-furnace generated gas combustion chamber 13 in this manner. In the present invention, the control sensitivity of the air introduction amount by the combustion air supply self-control nozzle 11 is adjusted by changing the inclination angle of the one wall surface 19 against which the lower opening closing plate 22 suspended inside the air chamber 16 leans. It is possible to do.

  According to the present invention having the above-described structure, the coal particles 2 charged in the carbonization furnace 1 are heated and dry-distilled by a heating furnace provided adjacent to both sides of the carbonization furnace 1 to produce coke. . In the meantime, the gas generated in the furnace having high temperature heat generated from the coal particles 2 charged in the center of the carbonization furnace 1 and accelerated is charged in the vicinity of the furnace lid and has a low dry distillation temperature. While heating the particles 2, the particles 2 pass through the gaps between the coal particles 2 and flow into the in-furnace generated gas combustion chamber 13 equipped with the combustion air supply self-control nozzle, that is, the in-furnace generated gas combustion chamber. The generated gas in the furnace containing a large amount of unburned combustible gas through the gap between the coal particles 2 having a low carbonization temperature and flowing into the generated gas combustion chamber in the furnace changes in the combustion chamber in the combustion over and under conditions. Corresponding to the direction of pressure (positive and negative pressure) and its magnitude, the lower opening closing plate 22 of the air chamber 16 opens and closes itself, introduces the amount of air necessary for combustion, and burns completely. The gas generated in the furnace, which has been completely burned and has reached a high temperature, is supplied to the coal particle 2 charged in the vicinity of the furnace lid through the partition plate of the gas generated in the furnace, the heat-resistant metal strip, or the gas distribution port. Raise the temperature. That is, in the present invention, the coke oven is provided with a heating structure that sandwiches the coal particles 2 charged in the vicinity of the carbonization furnace lid from both sides of the carbonization furnace side and the furnace lid side.

The invention's effect

  According to the present invention as described above, the coal particles charged in the vicinity of the carbonization furnace lid are divided into the heating furnace provided adjacent to both sides of the carbonization furnace and the heating type carbonization furnace cover provided at the entrance / exit. Due to the dry distillation by the surface heating method, there is very little defective coke, and the generated gas in the furnace is completely burned while introducing the required amount of air in the furnace generated gas combustion chamber equipped with a self-control nozzle for combustion air supply. Insufficient coke ash differentiation and tar problems generated near the bottom of the furnace lid are also eliminated. In addition, in order to uniformly heat the charged coal particles at a rapid temperature increase rate, the coke operation time is shortened and coke re-shrinkage occurs to create a gap between the coke and the furnace wall. There is also an effect of completely extruding coke from the carbonization furnace without damaging the carbonization furnace wall by the extruder.

  BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a coke carbonization furnace lid in which an inlet / outlet on the coke extruder side of the carbonization furnace is closed and a carbonization furnace in the vicinity thereof, showing an embodiment of the present invention.   FIG. 2 is an enlarged view of the combustion air supply self-control nozzle attached to the outer wall surface of the furnace lid frame structure in FIG. 1, partially showing a cross-sectional view.

Explanation of symbols

1 Carbonization furnace
3 Carbonization furnace lid
10 doorway
11 Combustion air supply self-control nozzle
12 Vertical nozzle pipe
13, 13A Furnace generated gas combustion chamber
16 Air chamber
17 T type three-way pipe
18 Vertical pipe
19 One side wall surface inclined inward
20 Air inlet
21 Air introduction pipe
22 Opening closing plate
23 Opening lid for discharging coal dust
24 horizontal pipes
25 Open / close valve
26 Throttle nozzle for air ejection
27 Coal dust outlet

Claims (1)

  A T-type three-way pipe (17) is provided outside the carbonization furnace lid (3) that opens and closes the inlet / outlet (10) of the carbonization furnace (1) by providing an in-furnace gas combustion chamber (13) on the carbonization furnace (1) side. An air inlet (20) is provided on one side wall surface (19) inclined from the upper side to the inner side at the upper end side of the vertical pipe (18) of the vertical pipe (18), and the tip end side is lowered outward through the air inlet port (20). An air introduction pipe (21) for the oblique passage to be located, an air chamber (16) suspended from a lower opening closing plate (22) for opening and closing the air introduction port (20), and a vertical pipe are provided. An opening lid (23) for discharging coal dust is provided on the lower end side of (18), and an upper side is provided on the top side of the horizontal pipe (24) via an opening / closing valve (25), and an air ejection throttle nozzle (26). The lower side is the coal dust dropping port (27) and the gas generated in the furnace. Coke carbonization with a gas combustion chamber generated in the furnace, characterized in that a self-control nozzle (11) for combustion air supply, which is formed by connecting a vertical nozzle pipe (12) housed in the firing chamber (13), is attached. Hearth.

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