JPH07118657A - Purging mechanism for removing soot in continuous type equipment for producing formed coke - Google Patents

Abstract

PURPOSE:To provide the subject purging mechanism, having an introduction port for a purging fluid opened to the upstream side of a heater for an oxygen- containing gas, equipped with a mechanism for changing over a feed gas to the heater from the oxygen-containing gas to the purging fluid and improved in thermal efficiency without any action of an excessive amount of the purging gas. CONSTITUTION:This purging mechanism is provided by opening an introduction port for a purging fluid such as nitrogen gas from a nitrogen gas source 14 to the upstream side of a heater 11 for an oxygen-containing gas and installing a mechanism for changing over a feed gas to the heater from the oxygen- containing gas to the purging fluid in continuous type equipment for producing formed coke capable of carbonizing briquetted coal with a vertical type carbonizing furnace 2 using a combustible gas as a heating medium and producing the formed coke.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to soot removal in a continuous forming coke production facility for producing forming coke for metallurgy by carbonizing forming coal by an upright type carbonization furnace using a combustible gas as a heat medium. Regarding the purge mechanism.

[0002]

2. Description of the Related Art This continuous molding coke manufacturing equipment, so-called FCP equipment itself, is widely known as described in Japanese Patent Publication No. 56-47234.

FIG. 2 shows a process flow chart in this continuous molding coke manufacturing facility.

In the figure, the briquette charcoal A produced in the briquette charcoal production facility 1 is charged from the top of an upright continuous carbonization furnace 2 and is a low temperature carbonization gas B introduced from an intermediate part of the upright continuous carbonization furnace 2. And, the coke thus obtained is successively heated and dry-distilled by the high-temperature dry-distillation gas C introduced from a position lower than that, and the obtained coke descends into the cooling zone 3 at the lower part of the upright continuous dry-distillation furnace 2 and the cold gas introduced from the bottom part It is cooled by D and cut out as molding coke E by the discharge device 4.

The gas generated during the carbonization of the formed charcoal A is mixed with high-temperature and low-temperature carbonization gas to form a furnace top gas F, which passes from the furnace top 4 through a gas cooler or a sensible heat recovery device 5 and a gas cooler 6 to a dust collector. After the dust is removed in 7, a part is sent to the recovery facility 8 as a recovery gas G.

Most of the other dust-removing gas is circulated and blown into the upright continuous carbonization furnace 2 as the low temperature carbonization gas B, the high temperature carbonization gas C, and the cold gas D as the circulation gas H.

Except for the portion introduced as the cold gas E in the circulating gas, after being heated by the circulating gas heater 9, it is mixed with the extracted gas J from the inside of the furnace through the ejector 10 and then branched. One is introduced into the carbonization furnace 2 as a low temperature carbonization gas B as it is, and the other is partially combusted by mixing with the oxygen-containing gas K from the oxygen-containing gas heater or the heat storage furnace 11 and then heated to 500 ° C. or more. As a high temperature carbonization gas C, it is introduced into the carbonization furnace 2.

This upright continuous carbonization furnace requires a relatively small facility as compared with the conventional upright continuous carbonization furnace. Moreover, since gas is circulated and coke is extracted continuously, the operating efficiency is improved. On the other hand, if the circulating gas contains CO, H ₂ , CH ₄ , C ₂ H _4, etc., and the combustible components are not completely combusted when the temperature is raised by this partial combustion, In addition, the amount of soot adhering to the high-temperature gas circulation supply pipe 12 increases, and in some cases, the high-temperature gas circulation supply pipe 12 is blocked, which may hinder the operation of the upright continuous carbonization furnace. There is.

Therefore, it is necessary to burn and remove the soot adhering to the inner wall of the supply pipe, and for this purpose, a purge mechanism 13 is provided for purging the gas for carbonization remaining in the supply pipe. This purging mechanism 13 is provided with a branch pipe 19 from the N ₂ gas source 14 to the high temperature gas circulation supply pipe 12,
The introduction pipe 15 for the oxygen-containing gas is shut off by closing the valve 16 and at the same time the diffusion valve 17 is opened to diffuse the oxygen-containing gas, and the valve 18 of the high temperature gas circulation supply pipe 12 is closed to make the circulation gas C Shut off. Then, the valve 20 of the branch pipe 19 from the N ₂ gas source is opened to introduce a room temperature purging fluid into the system to purge the combustible gas, and then the introduction pipe 15 for the oxygen-containing gas K is opened to open the valve 16. Then, a method of burning and removing the soot that has adhered has been adopted.

However, in this conventional purging mechanism, (1) since the low temperature purging fluid is introduced into the system, the surface temperature of the inner wall is lowered, and the oxygen-containing gas for soot removal and the adsorbed soot introduced after purging. The reaction (combustion) speed is slowed down and the soot removal time becomes long, and the time until ignition of the soot is long and not efficient. In order to solve this, a dedicated purging fluid heater is required. (2) Heated oxygen-containing gas is released to the atmosphere without stopping the oxygen-containing gas heater. (3) Since a low temperature purge fluid is introduced, there are problems such as a large required flow rate of the purge fluid.

Further, in Japanese Patent Laid-Open No. 5-17779,
As a means for preventing the soot from adhering to the high-temperature carbonization gas pipe in such an upright continuous carbonization furnace, a space for partial combustion is provided in the introduction tuyeres to mix the combustion gas and the introduction carbonization gas. A method of accomplishing this is disclosed.

However, with such measures,
Although the amount of soot generated is reduced, the high temperature gas inevitably adheres to the inner wall of the supply pipe, and the soot adherence must be removed.

[0013]

DISCLOSURE OF THE INVENTION An object of the present invention is to continuously circulate gas in a continuous type coke manufacturing facility for carbonizing carbonized coal by an upright type carbonization furnace using such a combustible gas as a heat medium to produce carbonized coke. In particular, when removing soot adhering to the inner wall of the high-temperature carbonization gas channel, there is provided a device for purging the carbonization gas in the gas channel without reducing thermal efficiency and using an excessive amount of purge gas. Especially.

[0014]

According to the present invention, a purging fluid introduction port such as N ₂ gas is opened upstream of an oxygen-containing gas heater to connect the oxygen-containing gas and the purging fluid to the heater. It is characterized in that a switching mechanism is provided.

[0015]

The oxygen-containing gas heater can be used as a heating means at the time of introducing the purging fluid, and the purging fluid can be heated without newly providing a purging fluid heater, requiring a preheating time. It is possible to burn the adhered soot without adhering to it.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a purge mechanism 3 for removing soot according to the present invention.
0 is an alternative to the conventional purging mechanism shown as 13 in the continuous molding coke manufacturing equipment shown in FIG. In the figure, the same elements as those of the conventional equipment shown in FIG. 2 are denoted by the same reference numerals, and those not directly related to the purge mechanism are omitted.

[0017] In the figure, N ₂ gas supply tube 19 oxygen-containing gas heater 1 from the N ₂ gas source 14 of purge fluid
1, a valve 20 is provided on the N ₂ gas supply pipe 19 and a supply pipe 21 for the oxygen-containing gas (air) is provided as a switching valve between the purging fluid and the oxygen-containing gas (air).
A release branch pipe 22 is provided at each of which valves 23 and 24 are provided.
To provide. Further, on the downstream side of the oxygen-containing gas heater 11, a supply pipe 15 for the heated air and a purge gas supply pipe 25 are provided in a branched manner. Branch pipe 2 for releasing purge gas
6, and valves 27 and 28 are provided respectively. The supply pipe 15 for the heated air and the supply pipe 23 for the purging gas are connected to the hot gas circulation supply pipe 12 provided with the valve 18.

The purging mechanism 30 is operated as follows.

During the purge period, the valve 24 of the air supply pipe 21
Is closed and the valve 23 of the branch pipe 22 is opened to stop the introduction of room temperature air and release it to the atmosphere. Next, the valve 20 of the N ₂ gas supply pipe 19 is opened to introduce the N ₂ gas into the heater 11. Further, the valve 16 of the air supply pipe 15
And the valve 18 of the high-temperature circulating gas supply pipe 12 is closed, and the residual air in the pipeline is diffused to the outside of the system. Open the valve 27 of the gas supply pipe 25,
The valve 28 of the branch pipe 26 is closed to introduce the purging gas into the system.

Thus, the purging gas can be heated to remove the combustible gas in the system without separately providing a heating device.

[0021]

Since the heated purging fluid is introduced into the system by the purging mechanism of the present invention, the flow rate of the purging fluid can be reduced and the heat loss in the system can be reduced.
Therefore, it becomes possible to reduce the soot removal time which adversely affects the condition of the dry distillation furnace.

By reducing the flow rate of the purging fluid, it is possible to reduce the adverse effect of the purging fluid on the furnace condition.

Since the heated purging fluid is introduced into the system, adverse effects on refractory materials (particularly spalling) can be reduced.

[Brief description of drawings]

FIG. 1 shows a purging mechanism according to the present invention.

FIG. 2 shows a system of an upright continuous carbonization furnace incorporating a conventional purging mechanism.

[Explanation of symbols]

1 Molded coal production equipment 2 Upright continuous carbonization furnace 3
Cooling zone 4 Discharge device 5 Sensible heat recovery device or gas cooler 6 Gas cooler 7 Dust collector 8 Recovery equipment 9 Circulating gas heater 10 Ejector 11 Oxygen-containing gas heater 12 High temperature gas circulation supply pipe 13 Conventional purging mechanism 14 N ₂ Gas source 15 Oxygen-containing gas introduction pipe 16 Oxygen-containing gas introduction pipe valve 17 Oxygen-containing gas diffusion valve 18 Hot gas circulation supply pipe valve 19 N ₂ supply branch pipe from gas source 20 N _{2 from} gas source Branch pipe valve 21 Air supply pipe 22 Air supply pipe branch pipe 23, 24 Air supply pipe valve 25 Purge gas supply pipe 26 Purge gas release branch pipe 27, 28 Purge gas release Branch pipe valve 30 Purging mechanism for soot removal of the present invention A Molded coal B Low temperature carbonization gas C High temperature carbonization gas
D Cold gas E Dry distillation coke F Top gas G Recovery gas
H 2 circulating gas

Claims (1)

[Claims] 1. A continuous forming coke production facility for producing a forming coke by dry distillation of forming coal in an upright type carbonization furnace using a combustible gas as a heat medium, wherein a purging fluid inlet is provided at an upstream side of an oxygen-containing gas heater. A purge mechanism for soot removal, which is open to the side and provided with a mechanism for switching the oxygen-containing gas and the purge fluid to a heater.