JPS63110281A - Operation of dry type quenching equipment for coke - Google Patents

Abstract

PURPOSE:To prevent combustion of coke mass and to drastically curtail troubles due to powder coke, by sending air to a gas circulation path at an outlet side of a quenching furnace, burning coke powder in a gas and reducing oxygen concentration. CONSTITUTION:A quenching furnace 1 having a cooling chamber 2 in the interior is connected to an outside waste-heat boiler 3 by a gas circulation path, red-hot coke fed from an upper feed opening 4 is quenched by a circulating gas from the lower part and the waste-heat boiler 3 is operated by the circulation gas heated by heat exchange with the coke. Air is sent to the gas circulation path at the outlet side of the quenching furnace and oxygen concentration is reduced by combustion reaction.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an operating method in a coke dry extinguishing system, and more specifically, a method for burning coke powder generated within the system of the equipment, and at the same time increasing the amount of heat recovery. It is about how to make money.

[Conventional technology]

From the history of coke, the conventional method for extinguishing scorching coke that has been discharged from the kiln was a wet method in which water is sprayed in a fire tower. A dry fire extinguishing method in which inert gas is recovered in the form of steam as a total medium has been developed from the viewpoint of energy conservation and has been put into practical use.

Conventionally, the commonly used coke dry fire extinguishing equipment is
A fire extinguisher with an internal cooling chamber and an external waste heat boiler are connected through a gas circulation circuit, and all of the red-hot coke charged from the top is extinguished by inert circulating gas from the bottom, and high-temperature coke is extinguished by heat exchange with the coke. The system uses recycled gas to operate a waste heat boiler.

In such coke dry fire extinguishing equipment, the circulating gas discharged from the fire extinguishing furnace contains a large amount of coke powder, and as a countermeasure against wear of the subsequent boiler, circulating gas blower, etc., an exhaust pipe is installed to remove the coke powder. The fruit is removed.

In addition, unburnt gas generated during the contact heat exchange between extinguished red-hot coke and inert gas mixes into the circulating gas flow, increasing combustible components such as H2, creating a risk of explosion. For this reason, a diluent gas such as air is introduced into the circulating gas, excess gas is discharged from the system, and inert gas is replenished. As such technology, for example, Japanese Patent Application Laid-Open No. 59-1
As shown in Japanese Patent No. 05078, there is a method in which a gas having a high specific heat is added to the circulating gas to adjust the circulating gas components.

[Problem that the invention seeks to solve]

However, if air or the like is mixed into the circulating gas as a diluent gas and introduced into the fire extinguishing furnace, the lump coke will be burned and consumed, resulting in a drawback that the original function as a fire extinguishing equipment will be halved.

The present invention prevents the combustion of lump coke and prevents the rise of combustible components in the circulating gas, reduces coke powder in the same system, and greatly improves the heat recovery effect in the waste heat boiler. Provide operating methods.

[Means for solving problems]

The gist of the present invention is to connect a fire extinguishing furnace having an internal cooling chamber and an external waste heat boiler through a gas circulation circuit, to extinguish red hot coke charged from the top with circulating gas from the bottom, and to extinguish red hot coke charged from the top with circulating gas from the bottom. In equipment that operates a waste heat boiler with circulating gas that has been heated to high temperature through heat exchange, air is blown into the gas circulation circuit at the extinguishing outlet side to completely burn the coke contained in the gas, and the boiler This is a method of operating a coke dry fire extinguishing equipment characterized by injecting combustible gas at the inlet side and completely reducing the oxygen concentration through a combustion reaction. The combustible gas may be completely mixed with unburned gas recovered in the fire pits of the fire extinguishing furnace.

[Effect]

The present inventors have conducted basic tests with the aim of preferentially burning only the coke breeze without completely burning the lump coke, and as a result they have arrived at the present invention.

In other words, the combustion of coke breeze tends to be more efficient at high temperatures and in an atmosphere with a more than ethical combustion fA air ratio. As a result, it was found that the combustion coupling decreased.

Therefore, in order to burn the coke powder contained in the circulating gas, the mixing of unburned gas is avoided as much as possible, and the gold is burned and removed by air at a ratio higher than the stoichiometric air ratio before the boiler inlet. The combustible gas is then injected into the boiler inlet, and since excess oxygen is injected first, the oxygen that remains after combustion is consumed and removed by a combustion reaction, and the circulating gas is further heated to a high temperature by combustion. Introduced to waste heat boiler. As the combustible gas, for example, coke raw gas or blast furnace byproduct gas is used.

In addition, if the unburned gas recovered in the P-I+ chamber of the fire extinguishing furnace is mixed with the combustible gas and blown into combustion, the combustible content in the unburned gas will be removed by combustion, so the combustible content will be concentrated during circulation. This is effective because it reduces the risk of explosion.

In this way, when combustion heat is recovered in the boiler and then blown into the fire extinguishing furnace, it contains almost no oxygen, so there is no consumption of lump coke by combustion. Further, according to such an operating method, not only the amount of steam to be recovered can be increased, but also the equipment troubles caused by the coke breeze in the circulating gas can be avoided.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 is a diagram illustrating a method of operating a coke dry fire extinguishing equipment according to the present invention. 1 is a fire extinguisher φ, 2 is a vertical cooling chamber formed inside the fire extinguisher, and 3 is a waste heat zeira. Red-hot coke of approximately 1200°C extruded from the coke oven is transported to this facility via a transport container (not shown), and is transferred from the coke charging port 4 of the fire extinguishing furnace 1 into the pre-chamber 5 (approximately 1200°C
150°C, 25 times/H1 charging. This red-hot coke stays in the pre-chamber 5 section for 1 hour, and then naturally descends downward into the cooling chamber 2 in a nearly continuous flow.
When the temperature reaches 0°C, it is cut out and discharged from the discharge port 6.

On the other hand, the cooling circulating gas (N2II inert gas) is evenly distributed by the cooling gas distribution device 7 in the lower part of the cooling chamber 2, passes through the coke layer in the cooling chamber 2, and comes into contact with the coke. The red-hot coke is cooled and at the same time heated to a high temperature by utilizing the sensible heat of the coke. This high-temperature circulating gas is drawn into the circular flue 8,
It joins with the unresolved gas generated in Burichanno-5, and after removing coarse coke in dust catcher 9, it enters waste heat boiler 3 and generates steam by heat exchange. The circulating gas cooled by heat exchange is removed from dust by a cyclone 10.
It is blown into the cooling chamber 2 again by the circulation blower 11.

Note that 12 is a discharge pipe, which controls the gas components by releasing a part of the circulating gas when the combustible components increase.

The present invention, which is a method of operating such a coke dry extinguishing equipment, provides an air introduction pipe 13 in the annular flue 8 as the exit side of the fire extinguishing furnace 1 on the gas circulation circuit, and first supplies excess oxygen and gold to the cooling chamber. The coke powder contained in the circulating gas discharged from step 2 is sufficiently burned and removed.

A combustible gas inlet pipe is provided on the boiler inlet side using 14-karat gold, and combustible gas is supplied from the gas supply pipe 15, and the oxygen remaining after combustion is combusted by the above-mentioned gluttonous air introduction, so that all the oxygen in the circulating gas is completely consumed. do.

With this configuration, the combustible gas combustion temperature is added to the temperature of the waste heat and circulating gas introduced into the boiler 3 that has become high through heat exchange in the cooling chamber 2, making it possible to recover steam even higher than before. becomes.

In addition, if the unburned gas generated and retained in the chamber 5 of the pipe 11 is recovered by the recovery pipe 6, air is introduced as described above to prevent a reduction in the combustion rate during combustion of the coke powder. If the recovered unburned gas is mixed with combustible gas and blown into the mixture through the gas introduction pipe 14, the combustible components are eliminated by combustion.

The operating conditions and results of the operation in this manner will be explained.

Is the amount of circulating gas 140,000 NW? /hr, and the coke throughput was 110 t/'hr. The gas components in the pre-chamber are shown in Table 1, and the amount generated was about 10 NFF//t-coks.

Table 1 The concentration of coke breeze contained in the circulating gas is 21 S/Ni, and theoretically the concentration of coke breeze contained in the circulating gas is 26.0 to completely burn the coke breeze.
00 Ni/hr of introduced air is required, but the air ratio is set to 1.3 to promote the combustion of coke breeze.
4.000 NWl/'hr of air was mixed into the flue 8 to ensure that most of the coke powder was burned by the inlet of the waste heat boiler 3. On the other hand, unburned gas is 1 +100 N
m'/hr, but Table 2 shows the concentration of blast furnace gas 1
0,500 Ni/'hr was mixed to consume the remaining oxygen after the coke breeze combustion.

Table 2: 57% by combustion of the above coke breeze and combustible gas
．． 2t/hr (7ROkcal/krstaam
It was possible to obtain all the recovered steam called I. Under the same operating conditions, the amount of steam generated from coke sensible heat alone is 40.7 tons.
When compared with 780 kcal/hr and 2 stsam l, it was possible to significantly increase the steam gold recovery.

Furthermore, in the past, it was not possible to preferentially burn coke powder, and lump coke was also burned all at once, but with the present invention, it was possible to burn a large amount of coke powder, so the waste heat boiler 3 , it is possible to solve the wear problem of the circulation blower 11, etc., and to stably increase the amount of recovered steam.
Moreover, since the concentration of combustible components in the circulating gas could be reduced by combustion, the risk of explosion could be avoided.

〔Effect of the invention〕

As explained above, according to the method of the present invention, equipment troubles caused by coke breeze contained in circulating gas can be largely avoided, and recovered steam can also be increased. This is an excellent invention in coke dry extinguishing equipment.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram illustrating a method of operating a coke dry fire extinguishing equipment according to the present invention. 1... Fire extinguishing furnace, 2... Cooling room, 3... Waste heat boiler, 4... Coke charging port, 5... Pre-chamber,
6...Discharge port, 7...Cooling gas distribution device, 8...
Okichi flue, 9...Dust catcher-110...Cyclone, 11...Circulation blower-112...Discharge/α, 13...Air introduction pipe, 14...Combustible gas introduction Pipe, 15...Gas supply pipe, 16...-Unburned gas recovery pipe. Agent: Patent attorney Masamitsu Akizawa and 1 other person

Claims (2)

[Claims] (1) A fire extinguishing furnace with an internal cooling chamber and an external waste heat boiler are connected by a gas circulation circuit, and the red-hot coke charged from the top is extinguished by the circulating gas from the bottom, and heat exchange with the coke is performed. In equipment that operates a waste heat boiler with circulating gas heated to a high temperature in A method of operating a coke dry fire extinguishing system characterized by blowing gas to reduce oxygen concentration through a combustion reaction. (2) A method for operating a coke dry fire extinguishing equipment according to claim 1, wherein the combustible gas is mixed with unburned gas recovered in a pre-chamber of a fire extinguishing furnace.