JPS628476B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for smoothly discharging coke and various powder materials cooled by a cooling device.

This process uses a countercurrent moving bed to cool particles forming a high-temperature lump with cooling gas, and recovers thermal energy from the cooling gas, which has become hot due to heat exchange with the particles. Coke dry cooling equipment that recovers heat using a countercurrent moving bed of red-hot coke is well known.

Figure 1 - Conventional coke dry cooling equipment
This will be explained based on FIG.

1 is a coke oven forming a furnace group,
A pusher 2 for pushing out red-hot coke is provided at the rear of the coke oven 1 so as to be able to run along the coke oven 1.

At the front of the coke oven 1, there is a guide rail 16
is laid along the coke oven 1, and a self-propelled coke guide car 3 is installed on the guide rail 16.
is located. This cork guide car 3 has
Dust generated when red hot coke 5 is extruded,
A dust collection hood 6 is attached to prevent smoke generation. Dust can be collected in a dust collector 8 through a fixed duct 7 supported by the frame.

Another rail 28 is provided at the lower front side of the guide rail 16 along the guide rail 16.
On this rail 28, a transport trolley 10, on which a trolley 9 and a charging bucket 4 disposed on the trolley 9 are mounted and mounted, is mounted so that it can run in a direction perpendicular to the rail 28, and a locomotive 11 It is placed so that it can be towed by.

When the coke guide car 3 travels and stops in front of an arbitrary furnace, the pusher 2 also moves and stops after the same furnace as the coke guide car 3, and the transport cart 10 is also pulled by the locomotive 11 and the coke guide car Stop in front of 3.

The red hot coke 5 pushed out by the operation of the pusher 2 passes through a coke guide car 3 and is received in a charging bucket 4. In this case, the lid of the opening of the fixed duct is opened by an opening mechanism such as a lifting magnet, and the dust generated during extrusion is collected in the dust collector 8 through the fixed duct 7. on the other hand,
When the red hot coke 5 is loaded into the charging bucket 4,
The transport trolley 10 is pulled by a locomotive 11 and moves to the position of the hoisting tower 12.

The hoisting tower 12 is provided with a pulling device 13 for pulling out the cart 9 on the transport cart 10 at its lower part, and a hoisting machine 14 for hoisting only the charging bucket 4 at its upper part. The hoisting machine 14 runs on a tower adjacent to the hoisting tower 12 and can stop on any cooling device 15a disposed below it.

Therefore, when the transport cart 10 moves to the hoisting tower 12, the charging bucket 4 is pulled together with the cart 9 to the lower central position of the hoisting tower 12 by the retracting device 13, and then only the charging bucket 4 is unrolled. The hoisting machine 14 is hoisted to the upper part of the hoisting tower 12 by the upper machine 14, and with the charging bucket 4 lifted up, the hoisting machine 14 moves sideways to reach an arbitrary cooling device 15a.

When the hoist 14 reaches an arbitrary cooling device 15a, the gate 18 at the bottom of the charging bucket 4 opens under its own weight, and the red-hot coke 5 is charged into the cooling device 15a. When the charging is completed, the empty charging bucket 4 is transported to a desired location in the coke oven 1 via a route completely opposite to the transportation route, and is loaded with new red hot coke 5. In the same manner as described above, it is transported onto an arbitrary cooling device 15a and charged with red hot coke 5.

The cooling device 15a is shown in detail in FIG. 3, in which a charging hopper 19 is disposed at the top, and a cooling device body 15 is disposed at the bottom thereof. The cooling device main body 15 contains red hot coke 5
In order to make the temperature distribution uniform, a prechamber 20 is formed in the upper part, and the lower part thereof is a countercurrent moving layer. Further, a cooling gas blowing port 21 is provided at the lower side of the cooling device main body 15, and a cooling gas blowing device 22 that communicates with the gas blowing port 21 is provided at the lower portion of the cooling device main body 15. ing. Further, the cooling device main body 15 is formed by assembling refractory bricks or the like, and a plurality of discharge ports 25 facing diagonally upward are provided on the circumferential inner wall of the intermediate portion thereof.
The discharge port 25 is communicated with an annular tube 26 having a rectangular cross section provided annularly inside the brick, and the hot gas discharge port 23 is connected to the annular tube 26 .

At the bottom of the cooling device 15a, there is a cooling device main body 15.
A cutting and discharging device 24 having a gate 17 facing diagonally upward is provided to cut out the coke that has been cooled while descending therein, and the cooled coke is transferred to a conveying device 2 such as a lower belt conveyor.
7.

The exothermic coke 5 charged into the cooling device main body 15 from the charging hopper 19 is supplied into the pre-chamber 20 in the cooling device main body 15 via the charging hopper 19, and is loaded on the coke charged in advance. , forming a countercurrent moving layer, which descends from above to below due to gravity.

On the other hand, the cooling gas is supplied from the gas blowing port 21 through the cooling gas blowing device 22 into the cooling device main body 15, is uniformly blown into the countercurrent moving bed, cools the red-hot coke as it rises, and cools the high-temperature gas. It passes through the exhaust port 25, the annular pipe 26, and the high temperature gas exhaust port 2.
3, the heat energy is recovered by an exhaust heat recovery boiler (not shown), the cooling gas is recirculated as a low-temperature cooling gas, and the gas is again blown into the cooling device main body 15 through the gas inlet 21.

The cooled coke that has descended within the cooling device main body 15 is appropriately cut out from a cutting and discharging device 24 and conveyed by a conveying device 27 such as a belt conveyor.

However, the above-mentioned conventional device has the following problems.

(a) Dust tends to clog the cutting and discharging gates.

(b) Cooling gas tends to leak because the pressure drop on the cutting and discharging device side is small.

(c) Large-scale transportation and hoisting equipment is required, resulting in high equipment costs.

(d) Dust and smoke are generated during the transportation and charging process of particles such as high-temperature red-hot coke, and dust pollution prevention equipment is required.

(e) Since the transport route is relatively long and takes a long time, heat loss due to heat dissipation to the atmosphere is large and heat recovery efficiency is reduced.

(F) Thermal shock during transportation causes the red-hot coke to become finer, resulting in a decrease in yield.

The present invention was made for the purpose of eliminating the above-mentioned drawbacks of the cutting and discharging device in the conventional cooling device for red-hot coke and various heat-containing powder and granules. A seal valve is provided at the lower end of the primary hopper to be kept open during operation, and a discharge port having a cross-sectional area smaller than the cross-sectional area of the cooling chamber is provided below the primary hopper. A secondary hopper is provided, and the entire height of the primary hopper and the secondary hopper is equal to the ventilation resistance due to the heat-containing solid filled in the primary hopper and the secondary hopper. The height is approximately equal to the resistance, and a feeder is provided below the secondary hopper, and a seal box whose pressure can be arbitrarily adjusted is provided above the feeder.

Embodiments of the present invention will be described below with reference to FIGS. 4 to 6.

In the figure, 31 is the same coke oven as in the conventional example, 32 is a pusher, and on a guide rail 33 installed in front of the coke oven 31 along the coke oven 31, a coke guide car 34 is installed so as to be self-propelled. A hopper 35 is fixed to the side of the coke guide wheel 34, and a discharge gate 36 which can be opened and closed by a hydraulic cylinder 37 or the like is attached to the tip of the hopper 35. Further, a dust collection hood 38 is installed above the hopper 35, and the dust discharged from the dust collection hood 38 is sent from a fixed dust collection duct 39 to a dust collector (not shown). ing.

In front of the coke oven, a charging hopper 40 is installed at a position lower than the lower end of the hopper 35.
The inside of the charging hopper 40 is lined with a lining made of refractory bricks or the like. A lid attachment device 41 is provided on the upper part of the charging hopper 40, and when charging the red hot coke 42, the charging hopper 40
0 cover can be opened and closed quickly.

A plurality of (four in this embodiment) charging ports 43 are provided at the bottom of the charging hopper 40, and the bottom thereof communicates with the inside of the cooling chamber 45 in the cooling device main body 44 of the cooling device 44a. . This charging port 43
The reason why a plurality of coke 42 are provided is to make the level of the exothermic coke 42 in the cooling chamber 45 as uniform as possible, and to distribute large lumps and small lumps of charged red hot coke 42 as uniformly as possible. In addition, uniform charging of red-hot coke is essential for preventing variations in the permeability of the cooling gas and cooling the red-hot coke as uniformly as possible.

The cooling device main body 44 is lined with a lining made of refractory bricks or the like, and is configured to prevent heat loss as much as possible. Further, a gas blowing port 46 is attached to the lower side of the cooling device main body 44, and the gas blowing port 46 is connected to a cooling gas blowing device 47 provided at a lower portion inside the cooling device main body 44. The cooling gas blowing device 47 is not limited to the one shown in the drawings, and any conventionally known appropriate device can be used.

A counter-current moving layer is formed by coke in the cooling chamber 45, and a plurality of discharge ducts 49 are installed in the upper part of the cooling device main body 44 to communicate with the cooling chamber space 48. The discharge duct 49
is connected to a circular annular tube 50. Further, the annular pipe 50 is connected to a duct 5 to a heat recovery boiler (not shown).
1. Cooling chamber space section 48
The height of the countercurrent moving bed of coke is determined so that the pressure is approximately atmospheric pressure, and the reason why a plurality of discharge ducts 49 are provided is to uniformly discharge high temperature gas from the cooling chamber. Furthermore, since the flow rate of the gas discharged from the discharge duct 49 is considered to be larger on the side closer to the duct 51, dampers 52 are provided for each side, so that the flow rate of the discharged gas can be adjusted.

A cutting and discharging device is provided below the cooling device main body 44. That is, the cooling device main body 44
A primary hopper 53 is fixed to the lower part of the primary hopper 53, and a pair of opposing cutting gates 54 are provided in the middle of the primary hopper 53 so as to be horizontally slidable. A seal valve 57 is provided at the lower end of the primary hopper 53 so as to be able to open and close vertically with respect to the pin pivot point.

Details of the cutout gate 54 and seal valve 57 are shown in FIG. Therefore, the cutting gate 54
consists of a left slide gate 54-2 that can be slid by a hydraulic cylinder 54-1, a right slide gate 54-2' that can be slid by a hydraulic cylinder 54-1', etc., which are operated alternately. However, the slide gates 54-2, 54 are designed to prevent coke from being bitten at the tips of the slide gates 54-2, 54-2' even if the cut-out gate 54 is fully closed during operation stoppage.
-2' are installed with a slight difference in level from each other.

The seal valve 57 includes a rack 57-2 that can be moved forward and backward by a fluid pressure cylinder 57-1, a pinion 57-3 that rotates by meshing with the rack 57-2, and a pinion 57-3 that is coaxial with the pinion 57-3. It consists of an attached valve body 57-4, a packing 57-5 attached to the lower end flange part of the primary hopper 53, etc., and by operating the fluid pressure cylinder 57-1, the pinion 57-4 is inserted through the rack 57-2. 3
, and then move the valve body 57-4 to the gasket 5.
7-5, so that sealing can be performed when the operation is temporarily stopped for maintenance or the like.

A secondary hopper 53 serving as a charging hopper is installed below the primary hopper 53, and a feeder 56 is installed below the secondary hopper 55 to continuously feed cooled coke on a belt conveyor. It is formed so that it can be cut out by the conveying device 58. Further, when cutting out coke, the primary hopper 53 and the secondary hopper 55 are always filled with coke.

Since the seal valve 57 is open during operation,
There is a possibility that the cooling gas leaks to the outside from the discharge port 60 at the bottom of the secondary hopper 55. Therefore, in order to prevent this as much as possible, the effective level H of the coke filled between the gas outlet 47-1 at the upper end of the primary hopper 53 and the discharge port 60 at the lower end of the secondary hopper 55 is set at the lower end of the cooling chamber 45. Gas outlet 4
The heights of the primary hopper 53 and the secondary hopper 55 are determined so that the heights of the primary hopper 53 and the secondary hopper 55 are approximately the same as the effective level H' of the coke filled between 7-2 and the lower end of the cooling chamber space 48. The cross-sectional area a of the outlet 60 of the cooling chamber 45 is made as small as possible (a<<A) than the cross-sectional area A of the cooling chamber 45.
Note that the effective level H of coke is expressed as H=H ₁ -H ₂ -H ₃ with reference to FIG. Here, H ₁ is the overall height of the primary hopper 53 and secondary hopper 55 from the gas outlet 47-1 at the upper end of the primary hopper 53 to the discharge port 60 at the lower part of the secondary hopper 55, and H ₂
is the height of the space below the cutting gate 54-2' of the primary hopper 53 that is not filled with coke, _H3 is the height of the space above the secondary hopper 55 that is not filled with coke, and H Both parts ₂ and _H3 do not function effectively as ventilation resistance.

As mentioned above, H=H' is set because the cooling chamber space 48 is at approximately atmospheric pressure, the exhaust port 60 is also at atmospheric pressure, and the amount of cooling gas flowing to the exhaust port 60 and the inside of the cooling chamber 45 are This is because the amount of cooling gas flowing through the exhaust port 60 is the ratio of the cross-sectional area a of the exhaust port 60 to the cross-sectional area A of the cooling chamber 45, and the amount of cooling gas leaking from the exhaust port 60 is small. The reason for this will be explained below.

The formula for calculating the ventilation resistance of a group of lumpy particles is shown by the following formula.

Δp/L=f/g・G ₀ ² /ρ・1/D _p・1−ε
/ε ³ ...(i) where ΔP; ventilation resistance L: effective level (m), here H and H'f; fluid friction coefficient g; gravity conversion coefficient = 980 (Kgm/Kgsec ² ) ρ; Density (Kgsec ² / m ⁴ ) G ₀ ; Mass velocity of gas (=ρU ₀ ) (Kgsec/Nm ³ ) U ₀ ; Superficial velocity (Nm/sec) D _p ; Representative particle diameter of agglomerated particles (m ) ε: Porosity of lumpy particle group (-) (i) Rearranging equation, we get the following.

Δp=(f/g・ρ・1/D _p・1−ε/ ^ε3 ) U ₀ ² L…
...(ii) Therefore, the ventilation resistance Δp ₁ due to the effective level H filled between the gas outlet 47-1 at the upper end of the primary hopper 53 and the outlet 60 at the lower part of the secondary hopper 55 is Δp ₁ =( f ₁ /g・ρ ₁・1/D _P1・1−ε ₁ /ε ₁
³ ) U ₀₁ ² H...(iii), and the ventilation resistance Δp ₂ due to the effective level H' of coke filled between the gas outlet 47-2 in the cooling chamber 45 and the lower end of the cooling chamber space 48 is Δp ₂ = (f ₂ /g・ρ ₂・1/D _p2・1−ε ₂ /ε ₂
³ ) U ₀₂ ² H′…(iv).

By the way, since the coke and gas handled in the cooling chamber 45, the primary hopper 53, and the secondary hopper 55 are the same, f ₁ = f ₂ , ρ ₁ = ρ ₂ ,
D _p1 = D _p2 , ε ₁ = ε ₂ , the ventilation resistances Δp ₁ and Δp ₂ are expressed as Δp ₁ = Δp ₂ , and the effective level H of coke is
If H' is H=H', then from equations (iii) and (iv), U ₀₁ ² = U ₀₂ ²
holds true, and therefore the gas flow velocities U ₀₁ and U ₀₂ in the primary hopper 53, secondary hopper 55, and cooling chamber 45 become equal. Therefore, the cooling gas blown from the gas inlet 46 has a cross-sectional area a of the outlet 60 as described above.
and the cross-sectional area A of the cooling chamber 45, the flow rate of the cooling gas toward the discharge port 60 can be reduced, and the amount of gas leakage can be reduced relative to the total amount of cooling gas.

It is commonly known in coke dry cooling equipment to maintain the cooling chamber space 48 at approximately atmospheric pressure.

A seal box 59 is provided at the discharge port 60 as shown in detail in FIG. The seal box 59 surrounds the feeder 56 so as to reliably capture the gas that leaks into the atmosphere from the discharge port 60 along with the coke cut out from the feeder 56. A discharge duct 59-1 is connected. The seal box 59 is used to control the pressure inside the seal box 59 to a minus several mmAq (for example, minus 3 to 5 mmAq) to prevent leakage of cooling gas.
Although not shown, a pressure detector, a flow rate control valve, etc. are provided inside.

Next, the operation of the present invention will be explained.

The coke guide car 34 runs on the guide rail 33 and stops in front of any coke oven 31, and the pusher 32 also runs and is located behind the coke oven 31 where the coke guide car has stopped.

When the coke guide wheel 34 and the pusher 32 are located at predetermined positions, the pusher 32 is extended to push out the red hot coke 42 in the coke oven 31 through the coke guide wheel 34 and to store it in the hopper 35.

When the red hot coke 42 is pushed out, the coke guide car 34 moves on the guide rail 33, reaches an arbitrary cooling device, and stops. Then, the lid of the charging hopper 40 is quickly opened by the lid attachment device 41, and then the discharge gate 36 of the hopper 35 is opened.
The red hot coke 42 is charged into the charging hopper 40, passes through the charging port 43, descends into the cooling chamber 45, rides on a countercurrent moving bed formed of coke, and passes through the cutting gate 54 at the bottom. and seal valve 5
By keeping 7 open, the countercurrent moving layer sequentially moves downward due to gravity. Since a plurality of charging ports 43 are provided, the level of the countercurrent moving layer is maintained substantially uniform, and the particle size distribution of large lumps and small lumps of the red hot coke 42 is also substantially uniform.

On the other hand, the cooling gas is supplied into the cooling chamber 45 from the gas blowing port 46 through the cooling gas blowing device 47, spreads uniformly over the cross section of the cooling chamber 45, and rises between the red-hot coke 42 one after another by gravity. The continuously descending red-hot coke 42 rises while being cooled, becomes a high-temperature gas, reaches the cooling chamber space 48, is sucked into the duct 51 from the discharge duct 49 through the annular pipe 50, and is drawn from the duct 51 into the duct 51 as shown in the figure. The gas is sent to a waste heat recovery boiler that is not equipped with a heat sink, gives heat to the boiler, becomes cooling gas, returns to the gas inlet 46, and is supplied into the cooling chamber 45.

The coke, which has been cooled by the cooling gas while descending sequentially by gravity, is discharged onto the feeder 56 through the primary hopper 53 and secondary hopper 55 by alternately operating the cutting gates 54. 56 onto a conveying device 58 such as a belt conveyor, and is transported to the next process by the conveying device 58 such as a belt conveyor. During such operation, the valve body 57-4 of the seal valve 57 is always kept open as shown by the solid line in FIG.

Coke is always stored in the primary hopper 53 and the secondary hopper 55, and H is approximately the same as H', and the secondary hopper 55
Since the pressure at the outlet of the cooling chamber is approximately the same atmospheric pressure as the pressure in the cooling chamber space 48, the amount of leakage of cooling gas can be kept to a small amount. , almost all leakage to the outside can be suppressed.

In order to prevent the shelf-hanging phenomenon caused by coke in the cooling chamber 45, the cutting gate 5 is opened at predetermined intervals.
4. Close the slide gate that is open, and open the slide gate on the opposite side. By continuously repeating this operation, the coke is shelved and stable cutting is performed.

When the operation is temporarily stopped for maintenance or the like, if there is a leak at the seal valve 57, the cooling device main body 44 becomes chimney-like, and atmospheric air flows into the cooling device main body 44 due to the draft effect. There is a risk that the red-hot coke that is sucked in will start to burn and cause an accident. Therefore, it is necessary to seal the lower part of the primary hopper 53 with the seal valve 57.
The operating procedure in this case is as follows. That is, the slide gate 54- of the cutting gate 54
2 and 54-2' into the primary hopper 53, the primary hopper 53 is fully closed, and the cooling chamber 4 is closed by the slide gates 54-2 and 54-2'.
The coke in the hopper 5 is supported to prevent the coke from falling downward, and the coke in the primary hopper 53 and the secondary hopper 55 is completely discharged by a feeder 56 to empty the hoppers 53 and 55. Next, the fluid pressure cylinder 57-1 is operated to close the seal valve 5.
The valve body 57-4 of No. 7 is brought into close contact with the gasket 57-5 on the lower flange surface of the primary hopper 53 to create a sealed state. Valve body 57- of seal valve 57
4 opens and closes in a state where no coke is present in the hoppers 53 and 55 to ensure complete sealing. By sealing the primary hopper 53 with the seal valve 57, atmospheric air is not sucked into the cooling chamber 45, and red-hot coke is not burned when the operation is stopped, improving safety.

At the start of operation, the valve body 57- of the seal valve 57
4 is fully opened to a position where the coke passing through the lower part of the primary hopper 53 does not come into contact with it, and one of the slide gates 54-2 and 54-2' of the cutting gate 4 is gradually opened, and the coke is transferred to the feeder 5.
6, the primary hopper 53 and the secondary hopper 55 are filled with cooled coke, and the coke is stored on the feeder 56, and cutting is restarted.

It goes without saying that the cutting and discharging device in the cooling device of the present invention can be used not only for red-hot coke but also for any appropriate powder, and that various other changes can be made without departing from the gist of the present invention. be.

Since the cutting and discharging device in the cooling device of the present invention has the above-described configuration, it can achieve various excellent effects as described below.

() The height of the primary hopper and secondary hopper,
The height is such that the ventilation resistance due to the heat-containing solids filled in the primary hopper and the secondary hopper is approximately equal to the ventilation resistance due to the heat-containing solids filled in the cooling chamber, and the cross-sectional area of the secondary hopper outlet is Since the outlet has a cross-sectional area smaller than the area, the pressure at the secondary hopper outlet can be maintained at approximately the same level as the space above the cooling chamber, which is adjusted to atmospheric pressure. Therefore, leakage of the cooling gas from the cut-out and discharge section can be effectively prevented. In addition, there is a seal box at the bottom of the secondary hopper that can adjust the pressure arbitrarily, so the inside of the seal box can be suctioned to minus several mmAq, which further improves the leakage of cooling gas from the secondary hopper outlet. It can be prevented.

() A seal valve is installed to completely seal the lower part of the primary hopper during temporary operation stoppages for maintenance, etc., which improves safety as there is no risk of atmospheric air being sucked into the cooling chamber and burning of red-hot coke.

() Powdered materials such as coke can be cut out smoothly.

() Particle size reduction due to drop impact is reduced, improving yield.

(V) The configuration is simplified and equipment costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is an explanatory plan view of a conventional dry coke cooling facility, FIG. 2 is an explanatory diagram of a conveying device in the cooling facility of FIG. 1, and FIG. 3 is an explanatory diagram of a cooling device in the cooling facility of FIG. 1. FIG. 4 is an explanatory plan view of the cutting and discharging device in the cooling device of the present invention, FIG. 5 is a view taken along the line V-V in FIG. 4, and FIG. 6 is a detailed view of the cutting and discharging device of the present invention. be. 31 is a coke oven, 34 is a coke guide car, 3
5 is a hopper, 40 is a charging hopper, 41 is a lid attachment device, 42 is a red hot coke, 43 is a charging port, 4
4a is a cooling device, 44 is a cooling device main body, 45 is a cooling chamber, 46 is a gas blowing port, 47 is a cooling gas blowing device, 47-1, 47-2 are gas blowing ports, 48 is a cooling chamber space part, 50 is a An annular pipe, 53 a primary hopper, 54 a cutting gate, 55 a secondary hopper,
56 is a feeder, 57 is a seal valve, 59 is a seal box, and 60 is a discharge port.

Claims (1)

[Claims] 1. A primary hopper with horizontally opposed cut-out gates is provided at the bottom of the cooling chamber, a seal valve is provided at the lower end of the primary hopper to be kept open during operation, and a A secondary hopper having a discharge port with a cross-sectional area smaller than the area is provided, and the entire height of the primary hopper and the secondary hopper is reduced by the ventilation resistance due to the heat-containing solid filled in the primary hopper and the secondary hopper. The height is approximately equal to the ventilation resistance due to the heat-containing solid filled in the cooling chamber, and a feeder is provided at the bottom of the secondary hopper, and a seal box whose pressure can be arbitrarily adjusted is provided at the top of the feeder. A cutting and discharging device in a cooling device characterized by: