JPH0753869B2 - Coke dry fire extinguishing equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a novel coke dry fire extinguishing facility, and
The present invention relates to a coke dry fire extinguishing equipment which can effectively collect powder coke in this gas without changing the circulation gas flow path and can achieve downsizing of equipment.

[Prior Art] Conventional coke dry fire extinguishing equipment, as shown in FIG.
The collision reversal type dust remover 20 was provided.

FIG. 5 shows a schematic structure of a conventional coke dry fire extinguishing system. In the figure, 21 is a cooling tower, 22 is a boiler, and 24 is a circulation blower. The red hot coke is cooled by the circulating gas supplied into the cooling tower 21, and the circulating gas that has undergone heat exchange with the red hot coke flows into the boiler 22 through the flue 25 for heat recovery. The collision reversal type dust remover 20 is formed in the flue 25, and collects the coke dust here to reduce the wear load of the boiler 22.

The specific action of the collision reversal type dust remover 20 is that, as shown in FIG. 6, the circulating gas is diverted downward by the partition plate 20a, and the powder coke in the circulating gas is collided by the inertial force with the partition plate 20a to move downward. It is designed to fall naturally and be collected.

In addition, 23 in FIG. 5 is a cyclone arranged in the low temperature gas area at the outlet of the boiler 22, and since dust removal by the dust remover 20 is insufficient, a fine dust collection or a main dust collection is made to compensate for this. To protect the circulating blower 24 from abrasion by powder coke.

[Problems to be Solved by the Invention] The conventional coke dry fire extinguishing equipment described above has the following drawbacks.

(1) The dust remover must remove dust coke and the like in the gas at about 800 ° C to 850 ° C and needs a large flow passage cross-sectional area because the gas flow velocity at the boiler inlet must be reduced. Therefore, it becomes a large fire resistant structure,
Requires a large amount of refractory material.

(2) The dust remover is installed at the flue between the outlet of the cooling tower and the inlet of the boiler, and therefore is a high place. Therefore, a large supporting frame is required in combination with the large weight of the object to be supported. To do.

(3) The dust remover requires a certain length in the flow direction of the gas for dust removal and for preventing uneven flow and rectification of gas (the longer the better, the better). At the same time, the distance between the cooling tower and the boiler is increased, the space occupied by the plant is increased, and the plant components such as the gas duct, the frame, and the pipe are increased (lengthened) accordingly. In addition, this will increase the plant construction site, etc., and increase the restrictions on location.

(4) Since the dust remover is constructed of a refractory material, the degree of freedom in shape and structure is small, and the dust removal efficiency cannot be improved. For this reason, the dust removal capability is low, and the amount of coke powder carried into the boiler increases, which collides with the boiler tube, which causes the tube to wear and shorten the service life.

(5) If the shape is made complicated in order to improve the dust removal efficiency, a gas drift occurs when passing through this, and the efficiency of the boiler is reduced. Further, the concentration of coke powder is also unevenly distributed due to the nonuniform flow of gas, and in combination with the above nonuniform flow of gas, local wear of the boiler tube occurs and the life is further shortened.

(6) In order to extend the life of the boiler tube, it is necessary to reduce the gas flow velocity in the boiler. For this reason,
The gas passage section of the boiler becomes large. Further, since the heat transfer rate decreases as the flow velocity decreases, it is necessary to increase the heat transfer area, and the number of tubes must be increased. Therefore, the size of the boiler is increased due to these factors.

(7) To extend the life of the boiler tube, it is necessary to install a protector on the upper surface of the tube, increase the thickness of the tube, and use a tube material with high wear resistance. Cause of.

[Object of the Invention] The present invention was devised in order to effectively solve the above-mentioned problems, and an object thereof is to effectively remove dust without increasing the size of a coke dry fire extinguisher facility. In providing coke dry fire extinguishing equipment.

[Summary of the Invention] In order to achieve the above object, according to the present invention, a gas outlet above a cooling tower and a gas inlet above a boiler front wall are connected by a flue to exchange heat with red hot coke in the cooling tower. In the coke dry fire extinguishing equipment that removes dust in the circulating gas to a boiler by removing dust in the gas, dust in the circulating gas flowing from the inlet to the upper part of the boiler located at the gas inlet. To form a separation zone to separate by the inertia, the portion of the rear wall of the boiler facing the gas inlet and the separated dust collide, provided a dust trapping part facing the opening, of the dust trapping part In the opening, a plurality of baffle plates are provided, each of which is inclined rearward downward.

When passing through the cooling tower, the circulating gas in the coke dry fire extinguishing equipment is included in a large amount of dust such as coke dust from the cooling tower, and enters the boiler via the flue. At this time, the gas is bent 90 degrees from horizontal to vertical before and after entering the boiler. At this time, the gas flows downward in the boiler due to the difference in inertia between the gas and the powder coke in the gas, but the powder coke flows in the horizontal direction as it is, and on the boiler rear wall facing the gas inlet of the boiler. collide.

The tube inside the boiler is locally worn on the rear wall side of the boiler. This is because the powder coke colliding with the boiler rear wall intensively flows downward on the rear wall side.

In the present invention, when the circulating gas enters the boiler as described above, paying attention to the fact that the gas flow changes, the upper part of the boiler located at the gas inlet is a separation zone for separating dust from the circulating gas, The dust trap is opened at the location on the rear wall of the boiler where the separated dust collides. By doing this, the dust in the circulating gas can be captured on the rear wall side of the boiler, there is no need to provide a dust remover on the upstream side of the boiler, and the cooling tower and the boiler can be brought close to each other to reduce the size of the equipment. it can. Moreover, by separating the dust by utilizing the change in the gas flow when entering the boiler, there is no need for a means for changing the gas flow, and the dust can be removed simply by providing a means for capturing the dust (dust trap). The dust remover and hence the supporting frame can be downsized, and in this respect also, the equipment can be downsized.

In addition, in the present invention, since a plurality of baffle plates are further provided in the opening of the dust capturing section with the rear part thereof being inclined downward, the dust reaching the opening is guided to the inside of the dust capturing section and the efficiency is improved. The dust can be well captured, and the dust that has been once trapped can be suppressed by preventing the dust-removed gas from flowing into the dust trap. Therefore, the dust removal efficiency is enhanced, the dust that collides with the boiler tube is reduced, and the life of the boiler tube can be extended.

[Embodiment] A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the coke dry fire extinguishing equipment according to the present invention.

A circulating gas inlet 3 is formed in the upper part of the front wall 2a of the boiler main body 2, and the inlet 3 is used to guide the circulating gas, which is heat-exchanged with the red hot coke in a cooling tower (not shown), to the boiler. The flue 4 is connected.

On the other hand, a dust remover 1 is provided on the rear wall 2b of the boiler body 2 facing the circulating gas inlet 3.

The dust remover 1 includes a dust trap 5 having an opening in the boiler, a coke cooler 6 for recovering heat from the trapped coke, and a coke discharger for discharging the cooled coke to the outside. 7 and 7.

It should be noted that the dust trap 5 is provided so that the opening thereof is located at a site where dust such as coke dust in the circulating gas flowing into the boiler main body 2 flows along the broken line arrow due to inertia and collides with the dust. .

Further, a powder coke collecting grid 5a shown in FIGS. 2 and 3 is provided in the opening. The powder coke collecting grid 5a is composed of a baffle plate whose front surface is formed in a grid shape as shown in FIG. 3, and the baffle plate 8 for horizontally partitioning faces the inside of the dust collecting portion 5 as shown in FIG. And the powder coke collides against the baffle plate 8 as shown by the broken line, and then reliably falls into the dust trap 5. The baffle plate 9 provided vertically prevents re-scattering of the powder coke due to the lateral gas flow.

On the other hand, the powder coke cooling unit 6 is designed to exchange heat with water to recover heat.

In addition, the powder coke discharge part 7 is a powder coke cutting part 7a.
And the powder coke transport section 7b.

Next, the operation of this embodiment will be described.

The circulating gas discharged from the cooling tower (not shown) flows in the flue 4 and flows into the boiler main body 2 while containing a large amount of powder coke. At this time, the gas flow is bent downward by 90 °, but since the inertial force of the pure coke component and the coke powder is greater than that of the coke powder, the gas component flows as shown by the solid line arrow, while the coke powder is broken line. It flows downward in a gentle curve as shown by the arrow, and reaches the dust coke trap grid 5a of the dust trap 5.

This tendency is greater as the number of particles having a larger adverse effect on the wear of the boiler tube is larger (the wear amount is proportional to the particle size), which is convenient for the tube wear countermeasure.

Next, the coke dust that has reached the collecting grid 5a collides with the baffle plate 8 and falls into the dust catching portion 5 as indicated by the broken line arrow in FIG. At this time, it is important to collect as much dust coke in the dust trap 5 as possible without scattering the dust coke that has reached the trap grid 5a, and efficiently guide the dust coke into the dust trap 5. The shape of the baffle plate is not limited to the lattice shape as long as it is one.

In addition, since the baffle plate itself is exposed to wear due to collision with powder coke, in order to reduce this, water cooling (direct or indirect) is used to lower the temperature, or a material with good wear resistance is used for a long time. It is even better if the life is extended.

FIG. 4 is a cross-sectional view showing an example in which the baffle plate has a water cooling structure, in which a tube 10 for flowing cold water is covered with a plate 11 made of an exchangeable wear resistant material.

On the other hand, since the pure gas component is the space in which the dust trap 5 is closed, it does not flow into the dust trap 5 and does not scatter the coke dust.

Next, the coke dust that has entered the dust capturing section 5 is cooled by the cooling section 6.
After being cooled by, it is discharged to the outside from the powder coke discharging unit 7.

INDUSTRIAL APPLICABILITY As described above, the present invention utilizes the change in the gas flow that is inevitably generated when the circulating gas enters the boiler main body, and has only the function of collecting the powder coke separated from the gas flow due to inertia. The conventional dust remover changes the gas flow depending on the shape of the dust remover itself, and utilizes the difference in streamlines due to the difference in inertial force between the resulting gas and dust such as coke dust, It is greatly different in that it has both a function of changing the gas flow of selectively collecting only dust and a function of collecting dust.

In order to increase the dust removal efficiency, it depends on how much coke dust is allowed to flow into the dust trap 5 and how to prevent re-scattering of the coke dust once collected.

For the former case, it is sufficient to increase the area of the opening of the dust capturing section 5, but this is not preferable because it greatly affects the boiler body 2. Therefore, the circulating gas inlet 3 of the boiler body 2
It is sufficient to reduce the diameter of and to increase the flow velocity there. For the latter, so that gas does not flow into the dust trap 5,
It suffices to cut off the gas flow path such that the gas such as a baffle becomes a resistance or a dead end, and the collected powder coke can be quickly moved to the lower storage part so as not to be exposed to the gas. If the dust capturing section 5 does not serve as a gas passage, it does not affect the gas flow in the boiler, so the boiler performance is less affected.

Also, according to the experiment, even without providing a baffle,
The gas flow into the dust trap 5 was small.

Further, in the present invention, the dust trap 5 can be formed by a part of the conventional casing of the boiler main body, and for example, a water cooling wall structure can be adopted. Moreover, if a wear resistant material is attached to the inner surface as a liner, longevity can be achieved.

[Effects of the Invention] As is clear from what has been described above, according to the present invention, the following excellent effects are exhibited.

(1) Gas and dust are separated by utilizing the difference in inertial force when the gas flow bends in the upper part of the boiler, and the separated dust is captured by the boiler rear wall side, so a dust remover is provided between the cooling tower and the boiler. Since it is not necessary to arrange the equipment, the equipment can be made compact by bringing them close to each other, and the exclusive space can be reduced.

(2) By separating the dust by utilizing the change in the gas flow when entering the boiler, a means for changing the gas flow is not required, and the dust can be removed simply by providing a dust trap to capture the dust. It is simple and compact.

(3) By removing the dust remover between the cooling tower and the boiler,
Since the gas flow does not change between them, the drift of the gas entering the boiler can be reduced, and the pressure loss can be reduced (substantially zero).

(4) Because the difference in the inertial force between the gas and dust at the boiler inlet is used for separation, the faster the gas flowing into the boiler, the greater the difference in inertial force, and the better the dust removal performance. The cross-sectional area of the flue may be small, and the flue made of refractory material can be made lightweight and compact.

(5) Since the dust capturing part is formed integrally with the rear wall of the boiler, it can be easily water-cooled by being integrated with the boiler tube and passing water. Therefore, it can be made of a metal material having low heat resistance, and has a higher degree of freedom in shape as compared with a refractory material or the like, so that it can be formed in a shape with good dust removal efficiency.

(6) Since the baffle plate that guides the dust to the inside of the dust trap is provided at the opening of the dust trap, the dust separated from the gas can be efficiently trapped and the re-scattering of the trapped dust is suppressed. It is possible to obtain high dust removal efficiency. Moreover, if the gas flow in the boiler is disturbed due to the opening of the dust trap, it is small, and the influence on the boiler can be prevented.

(7) Since the dust removal efficiency is increased by the above (5) and (6),
The amount of dust that collides with the boiler tube is reduced, tube wear is suppressed, and the life is extended. It is also possible to simplify the abrasion resistance means applied to the boiler.

(8) If the flow velocity of the circulating gas flowing into the boiler is increased by the above (4), the dust removal efficiency can be increased, which also increases the life of the boiler tube. Further, since the gas flow rate in the boiler is increased, the heat exchange rate is increased, and the size of the boiler can be reduced accordingly.

(9) If the dust trapping portion and the baffle plate are water-cooled according to the above (5), the heat transfer area can be provided by themselves, so that the influence on the boiler due to installation can be eliminated or reduced.

(10) If a boiler tube is placed in the wall of the dust coke storage section below the dust trap or in the stored coke, the high temperature coke trapped by the dust trap can be easily cooled, making it a conventional type. The cooling device becomes simpler.

Also, the heat of the powder coke itself can be effectively recovered (which was previously discarded), and the thermal efficiency of the coke dry fire extinguishing equipment is increased.

[Brief description of drawings]

FIG. 1 is a schematic side sectional view showing an embodiment of a dust remover in a coke dry fire extinguishing facility according to the present invention, FIG. 2 is a side sectional view of a baffle plate, FIG. 3 is the same front view, and FIG. 4 is water cooling. FIG. 5 is a sectional view of a baffle plate having a structure, FIG. 5 is a dust removal system diagram of a conventional coke dry fire extinguishing equipment, and FIG. 6 is a side sectional view showing a collision reversal type dust remover. In the figure, 1 is a dust remover, 2 is a boiler, 4 is a flue, and 5 is a dust trap.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hirohisa Homitsu 1 Mizushima Kawasaki-dori, Kurashiki City, Okayama Prefecture (no address) Kawasaki Steel Co., Ltd. Mizushima Works (56) References JP-A-50-5978 (JP, A) JP-A-53-146369 (JP, A)

Claims (1)

[Claims] 1. A gas outlet above the cooling tower and a gas inlet above the front wall of the boiler are connected by a flue, and the circulating gas that has undergone heat exchange with red hot coke in the cooling tower is used to remove dust in the gas. In the coke dry fire extinguishing equipment that removes by a dust remover and guides to the boiler, in the upper part of the boiler located at the gas inlet,
Forming a separation zone that separates the dust in the circulating gas flowing in from the inlet by inertia, at the site where the dust separated from the circulating gas collides due to inertia in the rear wall of the boiler facing the gas inlet. A coke dry fire extinguisher facility, characterized in that a dust collecting portion is provided facing the opening, and a plurality of baffle plates are provided in the opening portion of the dust collecting portion with the rear portions being inclined downwardly. .