JPH07188666A - Coke dry-quenching apparatus with charge chute - Google Patents

Abstract

PURPOSE:To prevent powdering of coke and improve the flow of a circulating gas in a quenching tower by installing an inclined charge chute equipped with a charge hopper outside the tower and installing a spiral guide section inside the tower. CONSTITUTION:A heat recovery duct 6 is installed on the top of a quenching tower 1; an inclined charge chute 4 equipped with a charge hopper 3 is installed outside the tower 1; and the chute 4 is connected to a charge chute 2 which is spirally arranged downward along the inner wall of the tower 1. The outside location of the hopper 3 reduces the travelling distance of a crane 14. Because of the inclination of the outer charge chute 4, which charges a red-hot coke into the tower 1, and the spiral arrangement of the guide section 2 inside the tower 1, the charge rate of coke is moderated, enabling uniform charge and preventing powdering of a red-hot coke. The efficiency in cooling the red-hot coke in the tower 1 is improved by uniformizing the coke by exhausting a circulating gas from the top of the tower 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to coke dry fire extinguishing equipment, and more particularly, to preventing powdering and uneven distribution of circulating gas when charging red hot coke discharged from a coke oven into the coke dry fire extinguishing equipment. It is intended to improve the cooling efficiency of the red hot coke and prevent the blow-up of coke at the flue portion.

[0002]

2. Description of the Related Art In conventional coke dry fire extinguishing equipment, as shown in FIG. 5, a coke bucket car 20 traveling on a rail 20a moves a coke bucket 22 loaded with red hot coke carried into a hoisting tower 21 on a ceiling. Rail 23a
It is hoisted by a crane 23 which traverses above and is transported laterally above the fire fighting tower 24. GL indicates the ground surface.

On the other hand, the charging port 25 of the fire extinguishing tower 24 until charging
The charging hopper 27 having the charging chute 26 waiting in the vicinity is moved by a device (not shown) in accordance with the opening of the charging port 25, and the red hot coke from the coke bucket 22 that has been carried conveys the extinguishing tower 24. Charging hopper 2 inside
7. Charged through the charging chute 26. The charging hopper 27 is retracted except when charging the red hot coke, and the charging port 25 is closed by a lid (not shown).

1000 ° C.-1 charged in the fire extinguisher tower 24
The 100 ° C. red hot coke A is cooled by removing sensible heat from the lower part of the fire extinguisher 24 by a circulating gas a blown through a conduit 28, that is, an inert gas such as so-called nitrogen gas. The cooled coke is carried out from the lower part B of the fire extinguisher 5 to be used for the reduction of the blast furnace.

On the other hand, heat is taken from the red-hot coke to 850 ° C.
The circulating gas b having a high temperature of about 1000 ° C. is sent to the boiler 31 via the flue portion 29 and the conduit 30 arranged in the peripheral portion of the fire extinguishing tower 24, and is heat-exchanged in the boiler 31. To a low temperature of about 130 ° C. to 180 ° C., the circulating blower 32 again blows the red hot coke blown from the lower part of the fire extinguishing tower 24 into the inside through the conduit 28, and cools the red hot coke to form a recycle. Further, as prior art published patents as prior art, there are the following published patents.

In Japanese Unexamined Patent Publication No. 57-192487, "Transporting device for dry fire extinguishing equipment for coke", an upper charging hopper having a charging lid is provided on the upper part of the fire extinguishing tower, and an external hopper is additionally provided for the extinguishing tower. It is provided on the outside and is connected to the charging hopper through a charging chute so that the red heat coke is charged into the fire extinguishing tower without traversing the crane.

In Japanese Unexamined Patent Publication (Kokai) No. 57-111379, "Raw material charging device for coke dry fire extinguishing equipment" is an invention for improving the structure of the charging device in the upper part of the fire extinguishing tower, and the chute part in the lower part of the charging hopper can be moved up and down. A chute having an inclination is provided at a lower portion of the fire extinguishing tower to further improve the distribution of coke in the fire extinguishing tower.

Japanese Unexamined Patent Publication (Kokai) No. 58-59283 "Coke charging device in coke dry cooling equipment" relates to the improvement of the structure of the charging device in the upper part of the fire extinguisher, and it can be swung below the charging hopper. A charging chute is provided to improve the distribution of coke charging inside the fire extinguisher.

[0009]

In the above-mentioned prior art, there is a problem of clogging of the flue portion due to the phenomena of coke dusting and coke blowing up to the flue portion.
The problem will be described in detail. In the related art, first, hoisting a coke bucket 22 loaded with red hot coke with a crane 23 and traversing it to an operation position above the fire extinguishing tower 24 requires time and effort for operation, and also increases weight. Since a certain crane 23 travels, the strength of the structure such as a building must be strengthened, and therefore there is a problem that the facility cost is high.

Further, when the red hot coke is charged into the fire fighting tower 24, it is charged into the fire fighting tower 24 from the upper part of the fire fighting tower 24 through the charging hopper 27 by a free fall method.
There is a problem that the impact of the impact causes the coke to be crushed or abraded so that the grain size becomes finer, the yield of the agglomerated coke required in the blast furnace decreases, and the unit price of the agglomerated coke increases.

Further, when the red hot coke is cooled in the fire extinguisher 24, the circulating gas is extracted in one direction from a flue portion 29 arranged at the peripheral edge of the fire extinguisher 24. Therefore, the gas flow inside the fire extinguishing tower 24 tends to be non-uniform, resulting in a decrease in cooling efficiency. For this reason, a large amount of circulating gas must be circulated, and when the amount of circulating air increases, a flow phenomenon of coke occurs, and coke is blown up into the flue section 29 to induce a decrease or blockage of the gas flow path and a coke dry fire extinguishing system. There were some serious problems that led to the suspension of the.

The flue portion 29 is limited in terms of the equipment structure of the fire extinguisher tower 24, and various proposals have been made to prevent blow-up of coke. For example, there is a plan to raise the position of the flue hole to a higher position, but the height of the fire extinguishing tower 24 becomes high, which causes an increase in equipment cost. Further, the plan to make the flue section 29 multi-stage is effective in reducing the coke blowing-up limit flow velocity, but there is a problem that the number of stages is limited.

Further, the above-mentioned published patent has the following problems. Japanese Patent Application Laid-Open No. 57-192487 proposes an improvement in the method of transporting red-hot coke. The method of introducing red-hot coke from the upper hopper of the fire extinguisher and the structure of the fire extinguisher itself are conventional. It is a free fall method, and it does not describe the prevention of coke dusting, the prevention of blow-up of coke to the flue part, and the coke cooling efficiency.

In Japanese Patent Application Laid-Open No. 57-111379, the method of introducing the red hot coke from the hopper at the upper part of the fire extinguisher into the fire extinguishing tower is the conventional free fall method and cannot prevent coke dusting. Further, since the structure of the fire extinguishing tower does not change at all and the extraction of the circulating gas is based on the conventional method, it does not contribute to the improvement of the coke cooling efficiency and the prevention of the blowing of the coke to the flue portion.

In Japanese Patent Application Laid-Open No. 58-59283, the method of introducing red hot coke from the upper hopper of the fire extinguisher to the inside of the fire extinguisher is the same as that of the conventional free fall method, and coke dust cannot be prevented. In addition, since the fire extinguishing tower structure remains unchanged and the circulating gas is taken out based on the conventional method, only the transfer of red hot coke is improved. It does not contribute.

As described above, the above-mentioned three patents disclose prevention of coke dusting, improvement of coke cooling efficiency,
Neither is there any description of the prevention of blow-up to the flue portion, and it is not suggested.

[0017]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention provides a heat recovery gas duct connected above the fire extinguishing tower and a red hot coke at the upper lateral position of the fire extinguishing tower. And a charging chute having one end connected to the bottom of the charging hopper and the other end arranged in an inclined state in the fire extinguisher, and along the inner wall of the extinguishing tower continuous to the charging chute. It is a coke dry fire extinguisher equipped with a charging chute consisting of a spiral chute arranged downward in a spiral shape.

[0018]

According to the present invention, when charging the red hot coke into the fire extinguisher, the red hot coke is gradually and uniformly introduced into the fire extinguishing tower by using the external charging chute and the spiral chute in the fire extinguishing tower as guides. Charged. Further, since the charged red hot coke is made uniform, the flow of the cooling circulating gas in the fire extinguisher smoothly flows from the lower side to the upper side.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall schematic view of a coke dry type fire extinguisher according to an embodiment of the present invention, 1 is a fire extinguisher tower, 2 is installed above the fire extinguishing tower 1, and one end is lined with the fire extinguishing tower 1. It is formed inside the fire extinguisher 1 along the wall surface of the brick, and preferably has an angle of 3
A spiral charging chute having an inclination in the range of 5 to 40 degrees, and the other end of the spiral charging chute 2 extends to the outside of the fire extinguishing tower 1 and is integrated with the bottom of the red hot coke charging hopper 3. It is connected to the external charging chute 4 having a closed cross-section structure that is electrically connected. A red hot coke charging amount adjusting mechanism 5 shown in FIG. 4 is provided in the middle of the outer chute 4.

Further, a hopper shape 1a is formed above the fire extinguishing tower 1 to facilitate focusing of the circulating gas, and one end of the heat recovery gas duct 6 is connected to the upper part thereof. The other end of the heat recovery gas duct 6 has a boiler 7 for heat recovery.
Connected to. The boiler 7 recovers the sensible heat of the red-hot coke with the circulating gas to generate steam for power generation or the like as in the prior art. In addition, 7a and 7b are water pipes.

Further, the lower part of the boiler 7 is connected to a circulation blower 8 via a conduit 9. The conduit 10 has one end connected to the circulation blower 8 and the other end connected to the fire extinguisher 1
The cooling inert gas a such as nitrogen gas is jetted out. The circulating gas b which has become hot by cooling the red hot coke 11 in the fire extinguisher 1 flows through the heat recovery duct 6 to reach the boiler 7, where it is cooled by exchanging heat with the boiler 7.
Then, it is re-fed into the fire extinguisher 1 by the circulation blower 8 to form a circulation state.

Reference numeral 12 denotes a charging lid, which is provided above the charging hopper 3 and has a function of blocking the outside air from the outside except when the conveyed red hot coke is charged into the fire extinguishing tower 1. Reference numeral 13 is a coke bucket, 14 is a coke bucket carrying crane, and 14a is the coke bucket carrying crane rail, which is the same as that of the prior art, and therefore its details are omitted.

FIG. 2 is a plan sectional view showing details of the spiral chute 2 formed in the fire extinguisher 1 of the present invention in FIG. 1, and FIG. 3 is a sectional view taken along the line AA of FIG. 2 and 3, the spiral chute 2 is integrally formed of a part of the fireproof lining brick 1b arranged inside the iron shell 1a of the fire extinguisher 1, and has a groove 2a formed at the center thereof. Lined brick 1
A spiral is formed downward along the inner surface of b. The angle of the spiral is preferably an angle suitable for the red hot coke to slide down along the spiral chute 2. For example, as described above, 3
An angle range of 5 to 40 degrees is selected.

FIG. 4 shows a red hot coke charging amount adjusting mechanism 5 provided in the middle of the external charging chute 4 of FIG. The outer charging chute 4 is a refractory lining brick 4b stretched on the inner surface of the iron skin 4a, and has a passage 4c of a closed cross section. A gate guide 5 is provided above the external charging chute 4.
a is provided, and the water cooling gate 5 is provided along the gate guide 5a.
A fork portion 5c integral with b is fitted so as to be vertically movable. At the upper end of the water cooling gate 5b, a gate opening adjusting fluid cylinder 5d is arranged, and the amount of the red hot coke 11 passing through the passage 4c is adjusted by driving the water cooling gate 5b up and down. In addition, 5e is a cooling water pipe of the water cooling gate 5b, and 5f is a pipe of the fluid cylinder for gate opening adjustment.

[0025]

As described above, according to the present invention, since the charging hopper is arranged outside the fire extinguisher, the traveling distance of the crane can be shortened. In addition, the external charging chute of red hot coke into the fire extinguisher is inclined, and the guide part inside the fire extinguisher is formed into a spiral shape, so the coke charging speed is moderated and the charging into the fire extinguisher is uniform. As a result, crushing of red hot coke is prevented. According to the present invention, the free fall distance of coke can be shortened by 9 m as compared with the conventional one. As a result, in the coke at the exit of the fire extinguisher, the recovery ratio of lump coke on the 50 mm sieve was improved by 3%.

Furthermore, the synergistic effect of exhausting the circulating gas from the top of the fire extinguishing tower and homogenizing the red hot coke inside the fire extinguishing tower makes the air flow of the circulating gas uniform and improves the cooling efficiency of the red hot coke. However, the amount of heat recovered per unit weight of red-hot coke increased remarkably by about 3.6% compared to the past, and the unit of heat recovery was improved.

Furthermore, since the flow rate of the circulating gas inside the fire extinguishing tower can be improved by eliminating the blowing of coke to the flue part, the fire extinguishing tower volume can be reduced, and the fire extinguishing tower itself is small. In other words, the construction cost can be reduced, and the construction cost can be drastically reduced. The present invention has an extremely great industrial effect.

[Brief description of drawings]

FIG. 1 is an elevational view showing an embodiment of a coke dry fire extinguisher according to the present invention.

FIG. 2 is a plan sectional view of a charging chute of the coke dry fire extinguisher according to the present invention.

FIG. 3 is a sectional view taken along the line AA of FIG. 2 in the charging chute of the coke dry fire extinguisher according to the present invention.

FIG. 4 is an explanatory view of a red hot coke charging amount adjusting mechanism arranged in the charging chute of the coke dry fire extinguisher according to the present invention.

FIG. 5 is a diagram showing an example of a conventional coke dry fire extinguisher.

[Explanation of symbols]

 1 Fire extinguisher 2 Spiral chute 3 Charging hopper 4 External charging chute 5 Red heat coke charging amount adjusting mechanism 6 Heat recovery gas duct 7 Boiler 8 Circulation blower 9 Conduit 10 Conduit 11 Red heat coke 12 Charging hopper lid 13 Coke bucket 14 Crane

Claims (3)

[Claims] 1. A heat recovery gas duct connected above the fire extinguisher, a charging hopper provided at a position laterally above the fire extinguishing tower for receiving red hot coke, and one end connected to the bottom of the charging hopper. A charging chute having an end arranged in an inclined state in the fire extinguishing tower and a spiral chute continuous with the charging chute and spirally arranged downward along the inner wall of the fire extinguishing tower was provided. Coke dry fire extinguishing equipment. 2. The device according to claim 1, wherein a red hot coke charging amount adjusting mechanism is installed in the charging chute having one end connected to the charging hopper and the other end connected to the spiral chute of the fire extinguisher. Coke dry fire extinguishing equipment with an entry chute. 3. The coke dry fire extinguisher system with a charging chute according to claim 1, wherein the angle of the spiral chute is 35 to 40 degrees.