JPH0153316B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cooling device for dust coke discharged from a coke fire extinguishing tower together with exhaust gas, and particularly relates to a cooling device for dust coke discharged from a coke fire extinguishing tower together with exhaust gas. The present invention relates to a cooling device that can effectively cool down and recover heat.

[Prior Art] Dry coke extinguishing equipment that extinguishes red-hot coke while cooling it is generally known.

This dry coke extinguishing equipment includes a coke extinguishing tower that extinguishes red hot coke while cooling it by bringing red hot coke and cooling gas into contact with each other in a countercurrent flow, and a coke extinguishing tower installed in the exhaust gas system of this extinguishing tower to remove dust coke in the exhaust gas. It is mainly equipped with a dust remover to recover the heat in the exhaust gas and a heat exchanger to recover the heat in the exhaust gas.

[Problems to be Solved by the Invention] By the way, in conventional dry coke extinguishing equipment, the dust coke in the exhaust gas from the coke extinguishing tower is collected by a dust remover and then indirectly cooled by a water cooling jacket. Ta. in this way,
Indirect cooling of dust coke using a water-cooled jacket has low cooling efficiency, and the water-cooled jacket has to be increased in size depending on the scale of the equipment. Further, this water-cooled jacket generally has a double-tube structure, and is configured to allow collected dust coke to pass through an inner tube and to allow cooling water to pass through an outer tube. Therefore, the length of the water cooling jacket must be increased because the dust coke recovered from the exhaust gas system is maintained at a significantly higher temperature. Furthermore, this water cooling jacket is provided below the dust remover, which poses a problem in that the height of the entire equipment must be increased or the number of water cooling jackets must be increased.

Furthermore, since the amount of heat from the dust coke is absorbed by the cooling water, a cooling tower is provided in the circulating water system of the water cooling jacket, and the absorbed heat is dissipated into the atmosphere by this cooling tower.

Therefore, in conventional equipment, when cooling dust coke, the cooling water was simply circulated to the cooling tower through a water cooling jacket without performing heat recovery, and the power cost and the amount of heat released into the atmosphere were combined. This resulted in a double loss.

In particular, since the exhaust gas system of the coke fire extinguishing tower is provided upstream of the red-hot coke, the dust coke contained in the exhaust gas is maintained at a high temperature as described above. In this way, the ability to effectively recover heat when cooling high-temperature dust coke will result in sufficient energy savings.

In view of the problems encountered in cooling dust coke in dry coke extinguishing equipment, the present invention has been devised to effectively solve these problems.

An object of the present invention is to provide a method for cooling dust coke discharged from a coke fire extinguishing tower by bringing it into direct contact with cooling gas and effectively achieving heat recovery. It provides a cooling device.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides heat in the exhaust gas through a dust remover to the exhaust gas system of a fire extinguishing tower that extinguishes red-hot coke while cooling it with cooling gas. In a coke fire extinguishing tower facility equipped with a waste heat recovery boiler, the dust coke obtained from the dust remover is fluidized and cooled with cooling gas after heat recovery by the waste heat boiler. and a heat recovery gas system for returning the gas heat recovered from the dust coke of the fluidized bed heat exchanger to the upstream side of the waste heat boiler.

[Operation] With the above configuration, the dust coke obtained from the dust remover is cooled by direct contact with the cooled cooling gas from the fire extinguishing tower whose heat has been recovered by the waste heat boiler using the fluidized bed heat exchanger. Furthermore, the gas that has undergone heat exchange with the dust coke in this fluidized bed heat exchanger is sent to the waste heat boiler via the heat recovery gas system to achieve heat recovery.

[Example] A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, 1 is a coke fire extinguishing tower, the top of which is provided with a charging port 2 for red-hot coke, and the bottom provided with an inlet 3 for cooling gas. Further, an exhaust port 4 is provided at the top of the coke fire extinguishing tower 1, and an exhaust gas system 5 is connected to the exhaust port 4.

The fire extinguishing tower 1 is provided with a red-hot coke moving bed forming section 7 extending from a red-hot coke charging port 2 to a cold coke cutting port 6 provided at the bottom. The red-hot coke moving bed formation section 7 is configured to form a flow of cooling gas that rises from the cooling gas inlet 3 to the exhaust port 4 and passes through the red-hot coke moving bed C. Therefore, the fire extinguishing tower 1 is constructed such that the cooling gas flows countercurrently upward with respect to the moving bed C of red-hot coke.

The exhaust gas system 5 is provided with a dust remover 8 on its upstream side and a waste heat boiler 9 as a heat exchanger on its downstream side. Exhaust port 1 of this waste heat boiler 9
0, a cooling gas circulation supply system 11 is installed to transfer the cooled gas again to the cooling gas inlet 3 of the fire extinguishing tower 1.
is connected. This cooling gas circulation supply system 11
A circulation fan 12 is interposed therein, and a cyclone 13 is provided upstream of the fan 12 to remove dust from the cold air cooled by the heat exchanger 9.

Next, the dust coke discharge port 36 of the dust remover 8 is provided with a fluidized bed heat exchanger 14, which is a feature of the present invention.

As shown in FIG. 2, this fluidized bed heat exchanger 14 is partitioned by a sealed housing 15, and a fluidized bed is formed in the housing 15 to fluidize dust coke with cooling gas. Part 1
6 is provided. Lower part 1 of this fluidized bed forming section 16
7 is provided with a hearth plate 18, a refractory heat insulating material 29, and an aeration nozzle 30, and constitutes an aeration plate 19. A wind box chamber 20 to which cooling gas is supplied is formed below the diffuser plate 19. A cooling gas introduction pipe 21 is connected to the wind box chamber 20, and this cooling gas introduction pipe 21 is connected to the cooling gas circulation supply system 11, and is used to collect part of the exhaust gas cooled by heat recovery from the boiler 9. The system is configured to supply parts. The introduction pipe 21 is provided with a flow rate control valve 22 .

Partition walls 23 are provided on the hearth plate 18 constituting the aeration plate 19 and stand up at a predetermined interval, and a divided fluidized bed forming section 16 with an open upper part is formed on the hearth plate 18. ing.

The fluidized bed forming part 16 is formed so that the upper part thereof is continuous along the hearth plate 18, and the dust coke introduction port 24 connected to the coke dust discharge port 36 of the dust remover 8 faces on the upstream side thereof. On the other hand, on the downstream side, a cooled coke discharge system 25 is provided for discharging the cooled dust coke that overflows from the fluidized bed to the outside of the system.

An exhaust section 26 for discharging the fluidized bed is formed above the fluidized bed forming section 16, and a heat recovery gas system 27 connected to the exhaust gas system 5 of the fire extinguishing tower 1 is connected to this exhaust section 26. This heat recovery gas system 27
The discharge end of is connected to the upstream side of the waste heat boiler 9 of the exhaust gas system 5, as shown in FIGS. 1 and 2.

Further, a flow rate control valve 28 is interposed in the heat recovery gas system 27, so that the exhaust flow rate can be adjusted.

Note that the air diffuser plate 19 is formed to allow only the cooling gas to pass through and not to allow the dust coke to pass through.
Since the particles of dust coke are relatively small, a diffuser plate 19a as shown in FIG. 3 can be used.

As shown in FIG. 3, the diffuser plate 19a is the hearth plate 18.
It is composed of a fireproof heat insulating material 29 and an aeration nozzle 30.

The aeration nozzle 30 has a triangular pyramidal cone portion 31 on the side of the fluidized bed forming portion 16, and has a cooling gas outlet 32 at the bottom of the cone portion 31 facing approximately horizontally onto the hearth plate 18. . This air outlet 32 is connected to the wind box chamber 2.
It is connected to a conduit section 33 extending to 0.

Therefore, the cooling gas supplied to the wind box chamber 20 is blown out from the conduit portion 33 of the diffuser nozzle 30 through the outlet 32 and along the hearth plate 18 forming the diffuser plate 19. The structure is such that the dust coke fluidized by this gas does not flow back into the aeration nozzle 30.

The operation of the present invention having the above configuration will be explained in detail.

As shown in FIGS. 1 and 2, the high-temperature dusty coke B discharged into the exhaust gas system 5 of the coke fire extinguishing tower 1 is collected by the dust remover 8, and is passed through the dusty coke inlet 24 from the coke dust outlet 36. The liquid is introduced into the upstream side of the fluidized bed forming section 16 of the cooling device 14 through the cooling device 14 .

On the other hand, cooling gas is introduced into the wind box chamber 20 from the cooling gas circulation supply system 11 while being controlled by the flow control valve 22 . The cooling gas A introduced into the wind box chamber 20 is introduced into the fluidized bed forming section 16 from the diffuser plate 19, and fluidizes the dust coke introduced into this forming section 16 to form a fluidized bed.

In this fluidized bed, the dust coke is fluidized by the cooling gas that has passed through the waste heat boiler 9, and is cooled by direct contact with the cooling gas.

As described above, the fluidized bed forming section 16 is divided into multiple stages by partition walls 23 along the hearth plate 18.
The dust coke, which is a solid substance in the fluidized bed, overflows the upper edge of each partition wall 23 and forms a fluidized bed that flows toward the downstream side of the discharge system 25 side. Therefore, the fluidized bed is cooled in stages as it flows from the upstream side to the downstream side. The fluidized bed of dust coke forming such a flow is completely cooled before reaching the discharge system 25 and is discharged from the system. A rotary valve 34 is interposed in the discharge system 25, and is configured to discharge a fixed amount of cooled coke.

The gas that has fluidized the dust coke is heated and rises to the exhaust section 26, and flows to the exhaust gas system 5 of the fire extinguishing tower 1 via the heat recovery gas system 27. In particular, the exhaust gas from the heat recovery gas system 27 is introduced upstream of the dust remover 8, and after the dust in the exhaust gas is removed by the dust remover 8 again, it flows into the waste heat boiler 9. Therefore, this waste heat boiler 9 cools the dust coke and recovers sensible heat from the heat exchanged gas. Further, in the fluidized bed of dust coke and cooling gas, the amount of dust coke introduced is controlled by the control valve 35, and the amount of cooling gas supplied is controlled by the flow rate control valve 22, so that an appropriate flow state is maintained. It will be operated continuously while being maintained.

Note that the cooling gas exhausted from the exhaust port 10 of the waste heat boiler 9 is passed through the cooling gas circulation supply system 11.
It will be circulated and supplied to the fluidized bed heat exchanger 14 and fire extinguishing tower 1 again.

[Effects of the Invention] Since the present invention is constructed as described above, it exhibits the following excellent effects.

(1) The dust coke discharged into the flue gas of a coke fire extinguishing tower can be cooled by direct contact with cooling gas after its heat is recovered by a waste heat boiler to improve cooling efficiency as much as possible. .

(2) When cooling dust coke, heat recovery can be effectively achieved and energy savings can be achieved.

(3) By using a waste heat boiler as a heat exchanger installed in the exhaust system of a fire extinguishing tower, heat can be recovered from dust coke, the entire equipment can be downsized, and it can be used in existing dry coke extinguishing equipment.

(4) When cooling dust coke, the exhaust gas after passing through the waste heat boiler used in the fire extinguishing tower can be used as cooling gas, which is highly practical as it can reduce the power cost required for cooling.

[Brief explanation of drawings]

Fig. 1 is a schematic system diagram showing a preferred embodiment of the device according to the present invention, Fig. 2 is a partially enlarged schematic sectional view thereof, and Fig. 3 is a portion showing a modified embodiment of the diffuser plate used in the present invention. It is an enlarged sectional view. In the diagram, 1 is the fire tower, 5 is the fire tower exhaust gas system, and 8
9 is a dust remover, 9 is a waste heat boiler, 14 is a fluidized bed heat exchanger, 16 is a fluidized bed forming section, 25 is a cooling coke discharge system, and 27 is a heat recovery gas system.

Claims (1)

[Claims] 1. In a coke fire extinguishing tower facility that is equipped with a waste heat boiler that recovers heat from the exhaust gas via a dust remover in the exhaust gas system of the fire tower that extinguishes red-hot coke while cooling it with cooling gas, A fluidized bed heat exchanger that fluidizes and cools the dust coke with heat recovered by the waste heat boiler using the cooling gas, and the gas recovered from the dust coke in the fluidized bed heat exchanger. A cooling device for dust coke discharged from a coke fire extinguishing tower, comprising a heat recovery gas system for returning the waste heat to the upstream side of the waste heat boiler.