KR930011918B1 - Coke dry cooling plant - Google Patents

Abstract

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Description

Coke Dry Chiller

Cross section of the present invention coke dry cooler.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blast-furnace coke dry-cooling device, in particular a front chamber having a coke inlet, a cooling chamber and a front chamber disposed below the front chamber and having a coke discharge outlet and a reactive gas supply inlet. It relates to a coke dry cooling device of the type consisting of an inert gas outlet connected to. The front chamber extends a vertical cylinder surrounding the coke stack, which forms an annular space constituting the passage of the inert gas together with the walls of the front chamber, and the inert gas is cooled in the front chamber and removed after dust is removed. It is sent to the inert gas supply side.

Conventionally, hot coke is periodically added to dry-cool the coke so that a constant amount of coke is always maintained at a constant temperature in the front chamber. A certain amount of coke descends from the front chamber to the cooling chamber. Inert gas flowing back here cools the coke. In addition, the coke is cooled by the coolant flowing through the coolant tube and the heat exchanged from the coke is absorbed by the coolant, which is used to generate steam either directly or through a heat exchanger (see German Patent Publication No. 33 32702). ).

The inert gas discharged from the inert gas outlet of the front chamber passes through a preliminary dust remover to remove dust before reaching the heat engine which is cooled in several stages. After the heat engine, the dust eliminator for the complete removal of dust can be connected to the inert gas supply port of the cooling chamber by the blower.

Such coke dry chillers of the prior art are expensive to install and the equipment for removing dust from the inert gas and cooling the inert gas takes up a relatively large space. This means that a long passage through which inert gas flows and a relatively large pressure loss can be caused, and the cause is considered to be in the preliminary dust remover and the precision dust remover of the thermal engine, and also the energy consumption required for their operation. Has a high drawback.

An object of the present invention is to reduce the cost required for the operation of the coke dry cooling system, to reduce the installation space, and to ensure an advantageous thermal balance while reducing energy consumption.

The object of the present invention is to form an annular space portion in the form of a post-combustion chamber in which a plurality of gas conduits extending from the top of a coke stack stacked in a conical shape on the front chamber and air supply pipes alternately arranged in these gas conduits are formed. This is achieved by providing a coolant tube through which coolant circulates on the inner wall.

The combustible components flowing together with the inert gas are burned in the annular space portion and at the same time, the inert gas is cooled in the annular space portion, so that most of the heat components contained in the circulating flow inert gas are lost. This reduces the amount of inert gas and can then appropriately reduce further connected devices such as dust removal devices, thermal engines, blowers and conduits.

A blower does not need to be installed in the gas conduit connected to the annular space portion from the top of the coke stack stacked conically in the front chamber. That is, the pressure of the upper part of the coke stack of the front chamber is about 20-50 mm WS (about 200-500 N / m <2>) higher than the pressure of an annular space part. In addition, since a sufficient amount of air is supplied to the annular space portion through the air supply pipe, the post combustion is effectively maintained in the annular space portion.

Heat emitted from the annular space portion is partially absorbed by the coolant circulating through the coolant tube disposed in the annular space portion. Cooling water tubes disposed in the annular space portion is connected to the upper and lower main building and the upper main building is connected to the steam chamber and the like according to the conventional method.

If the cyclone dust collector used in combination with the above-mentioned configurations to effectively remove dust from the inert gas is installed downstream of the inert gas outlet and the heat exchanger with cooling water is buried inside the wall, efficient use and energy of the installation space It will be a very advantageous configuration when considering consumption. Cyclone precipitators can be used in place of a facility that conventionally removes dust first and then completely removes it second. This is because the inert gas, which is only partially cooled in the annular space, has a relatively high temperature even though it is cooled, and thus it is relatively less viscous. Thus, this low viscosity is effective to remove dust as effectively as the high gas velocity found in the cyclone precipitator. help. Therefore, there is no need for a separate preliminary dust collector having a large pressure loss. Cyclone dust collector equipped with heat exchanger in the wall has large disturbance movement, excellent dust collection effect, minimizes pressure loss and is suitable for cooling inert gas. Therefore, it is not necessary to basically provide a separate heat engine.

The heat exchanger of the cyclone dust collector may be provided with a double wall heat exchange surface. However, the heat exchanger is composed of heat exchange flow webs connected to the upper and lower main pipes.

In some cases, the multi-stage heat exchanger may be installed in the cyclone dust collector so as to overlap the top and bottom in order to obtain various vapors passing through the various consumers. For example, the heat exchanger may be configured in the form of a superheater in the cylindrical portion of the cyclone connected to the inert gas outlet.

In the cyclone dust collector, it is preferable to form a wear resistant layer on the heat exchanger portion in which the inert gas flows.

On the downstream side of the cyclone dust collector, a thermal engine may be installed and used depending on the operating conditions.

Directly regenerates the combustible gas by directing the flow of some of the inert gas (including gases that can be activated and combusted when cooling the coke, such as carbon monoxide, hydrogen hydrocarbons, etc.) into the inlet gas supply port and into the cooling chamber. It is better to indirectly reach the annular space.

The present invention will be described in more detail with reference to the accompanying drawings as follows. The coke dry-cooling apparatus of this invention is comprised in the form of the blast furnace provided with the front chamber 1 and the cooling chamber 2 below. The front chamber 1 has a coke inlet 3 at its upper end. The front chamber 1 is formed with a vertical cylindrical body 6 made of a refractory material. The size of the vertical cylindrical body is an annular space portion between the wall 14 of the front chamber 1 and the vertical cylindrical body 6. 15) is sized to be formed. The vertical cylinder 6 ends in an extended state at a predetermined interval from the upper portion of the cooling chamber 2 and the inert gas outlet 16 is formed in the annular space portion 15 formed around the vertical cylinder 6. Connected.

The lower region 20 of the cooling chamber 2 is conical, and a coke discharge port 21 is formed at the lower end thereof. An annular conduit 22 is formed around the lower region 20 at an upper portion of the coke discharge outlet 21, and as described later in detail, the cooling chamber 2 is connected to the blower. In the lower region, a gas supply port 26 is disposed at the center thereof. The gas supply port 26 may be provided with an adjustable shutoff valve. The annular conduit 22 is connected to the blower 40 through an inert gas supply line 28.

A plurality of conduits 43 extending from the front chamber 1 between the front chamber 1 and the annular space portion 15 of the upper coke stack 42 to the annular space portion 15 through the coupling portion 30. ) Is connected. These conduits 43 are bonsai at equal intervals at regular intervals around the annular space 15, and the air supply pipe 18 is disposed between the conduit 43 and the adjacent conduit 43, so that the conduit 43 and The air supply pipes 18 are arranged alternately. The air supply pipe 18 extends to the annular space part 15 side. Cooling water tubes 44 through which cooling water flows are disposed on the inner and outer surfaces and the upper portion of the annular space portion 15. These tubs 44 are connected to the lower main pipe 45 and the upper main pipe 46. Cooling water is supplied to the lower main pipe 45 through the water supply port 47. Upper main pipe 46 is connected to steam chamber 49 via conduit 48.

Since the pressure of the upper part of the coke stack 42 laminated in the front chamber 1 is about 20-50 mm WS higher than the pressure of the inert gas outlet 16, the gas coming out of the front chamber 1 is connected to the gas conduit 43. It is sent to the annular space portion 15 side through. Conduit 69 branched from the inert gas supply line 28 is connected to at least one of the gas conduits 43, and a valve 70 is installed in the conduit 69. In the annular space portion 15, the combustible partial gas portion of the inert gas supplied to the annular space portion 15 directly from the outside air flows into it. In the annular space portion 15, about 15-20% of the total inert gas in the cooling chamber 2 and the annular space portion 15 is absorbed through the cooling water tube 44.

Inert gas outlet 16 is connected to the cyclone dust collector (50). The cyclone dust collector 50 is composed of a cylindrical portion 51 disposed at the height of the inert gas outlet 16 and a conical portion 52 below it. The heat exchanger through which cooling water flows is arrange | positioned inside the wall of the cyclone dust collector 50. The heat exchangers are arranged in groups so as to overlap each other. In the illustrated embodiment, the heat exchanger is composed of heat exchange tubes 53 arranged vertically in the cylindrical portion 51, and in the conical portion 52 composed of heat exchange tubes 54 arranged conically corresponding to this portion. do. These heat exchange tubes 53 and 54 are connected to the lower main pipes 55 and 56 and the upper main pipes 57 and 58, respectively. Water cooled in the steam chamber 49 is supplied to the lower main pipes 55 and 56 through the water inlets 59 and 60. The upper main pipe 57 of the cylindrical portion 51 is connected to the discharge conduit 61, the upper main pipe 58 of the conical portion 52 is connected to the steam chamber 49 through the conduit 62. In the illustrated embodiment, the heat exchanger of cylindrical portion 51 constitutes a superheater and the heat exchanger of conical portion 52 constitutes an evaporator.

The heat exchange tubes 53 and 54 and their main tubes 55-58 are disposed in the wall of the cyclone dust collector 50 in the illustrated embodiment, and the inner surface of the wall is protected by the wear resistant layer 63. A normal dust outlet 64 is formed at the lower end of the cyclone dust collector 50. The cylindrical portion 51 of the cyclone dust collector 50 is provided with another heat exchanger 65 thereon, which is connected to the steam chamber 49 via conduits 66 and 67.

In the cyclone dust collector 50, about 35-50% of the heat absorbed from the inert gas is discharged through the heat exchanger (65).

The inert gas flows from the cooling chamber 2 through the annular space portion 5, where most of the combustible components are combusted, and then reaches the cyclone dust collector 50 through the inert gas outlet 16. . In the cyclone dust collector 50, dust is removed and inert gas which has undergone extensive cooling passes through the thermally effective ventilation 64 without pressure loss and reaches the blower 40 through the conduit 68 where the inert gas supply line 28 is removed. Is sent to the cooling chamber.

Claims (9)

Cooling chamber (2) having a coke supply port (3) and a lower chamber (20) and a lower chamber (20) having a coke discharge outlet (21) and an inert gas supply line (28). In the form of a blast furnace and an inert gas outlet 16 is connected to the front chamber 1, the front chamber 1 surrounds the upper portion of the coke stack 42, the front chamber in the region of the inert gas outlet 16 The vertical cylindrical body 6 which forms the annular space part 15 in which the wall 14 of (1) is used as a passage of inert gas is extended, and the inert gas supply line after cooling and dust removal of inert gas ( In the coke dry-cooling apparatus capable of being recycled to 28, a plurality of gas conduits 43 and a supply pipe 18 extending from the upper chamber 1 of the upper side of the coke stack 42 are annular spaces 15. The tubs 44, which are configured as alternating post-combustion chambers arranged alternately, and in which cooling water flows, are formed on the wall 14 of the annular space 15. Coke dry, cool device as that value features. Coke dry cooling apparatus according to claim 1, characterized in that the tub (44) of the annular space (15) is connected to the upper and lower main pipes (45,46). Drying apparatus according to claim 1 or 2, characterized in that the cyclone dust collector (50) is installed downstream of the inert gas outlet (16) for dust removal. The coke dry cooling apparatus according to claim 3, wherein the inner wall of the cyclone dust collector (50) is composed of a heat exchanger through which cooling water is circulated. The coke dry cooling apparatus according to claim 4, characterized in that the heat exchanger consists of heat exchange tubs (53, 54) connected to the upper and lower main pipes (55-58). The coke dry cooling apparatus according to claim 4, wherein a plurality of heat exchange tubings (53) (54) are arranged above and below the cyclone dust collector (50). The coke dry cooling apparatus according to claim 4, wherein the heat exchange tubing (53) constitutes a superheater in the cylindrical portion (51) of the cyclone dust collector (50) adjacent to the inert gas outlet (16). Drying apparatus according to claim 4, characterized in that the wear-resistant layer (63) is formed on the surface of the heat exchange tube (53,54) to act with inert gas. The coke dry cooling apparatus according to claim 1, characterized in that the gas conduit (68) branched from the inert gas supply line (28) extends directly or indirectly into the annular space portion (15).

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