JPS5975981A - Dry quenching of coke - Google Patents

Abstract

PURPOSE:To recover fuel gas efficiently, by feeding a gas consisting of a mixture of air or N2 and water into a prechamber and allowing a gas produced by its reaction with red-hot coke to join a gas circulated in a gas duct. CONSTITUTION:One or both of a valve 21 of a feeding pipe 24 and a valve 22 of a feeding pipe 25 are opened and a valve 20 of a feeding pipe 23 is opened to supply a mixed gas consisting of N2 gas and/or air and water into the bottom of a prechamber 4 through a connecting pipe 28. When coke is charged into the prechamber 4, the supply of the mixed gas must be stopped or the amount of the mixed gas must be reduced to avoid its escape. The reaction of the mixed gas with red-hot coke produces a gas containing a large amount of CO and H2. A valve 29 is opened to feed the gas from a conduit pipe 30 to a gas duct 10 for mixing with a circulated gas. The circulated gas becomes rich in combustible components such as CO and H2 and, after heat exchange in a boiler, it is recovered through a recovery pipe 17.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coke dry extinguishing method, and more particularly to a coke dry extinguishing method in which surplus gas is efficiently recovered as fuel gas.

In the coke dry extinguishing method, red-hot coke is generally extinguished and cooled with an inert gas, and its sensible heat is recovered by a boiler, and coke dry extinguishing equipment is provided as equipment for this purpose. In this equipment, inert gas is supplied into the cooling chamber of the cooling tower for extinguishing and cooling the red-hot coke, and after exchanging heat with the coke, it is circulated through D2. In this case, Co and H are generated due to coke carryover or a small amount of intruding air, and surplus gas is generated. However, these 00. H.

Since such surplus gas is a dangerous (explosive, toxic) gas, conventionally it is diluted to the lowest possible level by blowing in N2 or air, and then treated with combustion, etc.
It was dissipating into the atmosphere.

In contrast to the conventional general surplus gas countermeasures described above, a method of actively increasing the combustible components in the circulating gas and recovering it as fuel gas has also been known. This method involves adding air to the circulating gas to increase combustible components,
Alternatively, by adding coke oven gas, water, or steam, and utilizing the reaction with coke, 0.00. H, is generated. However, in this method, air, water, steam, etc. are mixed with the low-temperature circulating gas before it is supplied to the coke cooling chamber, so the coke reaction is affected by the temperature distribution and non-uniformity of the gas flow in the cooling chamber. It has the disadvantage of being non-uniform.

In addition, as shown in Japanese Patent Application Laid-Open No. 55-149113,
Another method is known in which gas is supplied to the coke cooling chamber to take advantage of the reaction with the coke.

This method involves supplying externally generated (surplus) waste gas to the bricchanters and reducing fio by contact with red-hot coke.
After converting ol to 00, it is recovered as part of the fuel gas. However, in this method, the waste gas generation source is not necessarily located adjacent to the coke dry extinguishing equipment, so waste gas transportation equipment is often required.
Also, it can be supplied to Burichanno)<^Gas 111
Since the amount of fuel gas generated is small compared to the amount generated at the waste gas generation source, the amount of fuel gas that can be recovered is small compared to the investment in the necessary equipment, resulting in high costs. Furthermore, since the gas that has passed through the red-hot coke in the prechamber is at a high temperature, if this high-temperature gas is recovered as it is, the sensible heat held by the gas will not be utilized.

The present invention eliminates the drawbacks of the conventional ones mentioned above,
It is an object of the present invention to provide a coke dry extinguishing method that can efficiently recover fuel gas without inhibiting the recovery of sensible heat by a boiler.

According to the invention described in claim 1 of the present application, the above-mentioned object is achieved by supplying a gas made by adding moisture to at least one of air and nitrogen into the british nozzles from the outer circumferential side thereof to generate red-hot coke. This is achieved by producing a gas containing a large amount of fioo, H, and passing this gas from the upper part of the sol into a conduit to join with the circulating gas in the gas duct. According to the invention described in item 2, air and N! A gas prepared by adding water to at least one of the j500. This is achieved by producing a gas rich in H, which is combined with the circulating gas in the cooling tower.

The present invention will be explained below with reference to embodiments shown in the drawings.

1 and 2 show an embodiment of the invention set forth in claim 1 of the present application, and in FIG. 1, the coke heated in a coke oven (not shown) is transferred to a cooling tower 1 into the upper end opening 2. Inside this cooling tower 1, purican holes 4 are formed above a coke cooling chamber 3. A tapered coke discharge port 5 is formed at the lower end of the cooling chamber 3, and an annular gas chamber 6 is formed within the cooling tower l around the outer periphery of the coke discharge port 5. Then, a gas pipe 7 communicating with this gas chamber 6 faces a central position in the lower part of the cooling chamber 3.
The gas pipe 7 is formed with a plurality of openings (not shown) for supplying gas into the cooling chamber 3. On the other hand, another annular gas chamber 8 is formed in the cooling tower 1 on the outer periphery of the brie chamber 4, and this gas chamber 8 is formed of a plurality of gas chambers formed in the circumferential direction on the peripheral wall of the cooling chamber 3. It communicates with the openings 9, 9, -.

A gas duct 10 that communicates both the gas chambers 6 and 8 is extended outside the cooling tower 1, and a gas circulation blower 11 is installed in this gas duct 10 to cool cooling gas such as N. Gas duct from chamber 3) is circulated at 10K.

The gas duct 10 is designed so as to pass through the inside of the DIGI 12 on the way, and the high-temperature gas that has exchanged heat with the red-hot coke in the cooling tower 1 exchanges heat with the water flowing through the water pipe 13 of the zein 12 and becomes water. It is designed to heat and bring to a boil.

Diluting gas or air can be supplied to the gas duct 10 through a supply pipe 14, and air for diluting the cooling gas can be supplied through a supply pipe 16 provided with a blower 15. It is now possible to do so. Furthermore, the cooling gas in the gas duct 10 is collected through a collection pipe 111 into a predetermined tank or holter (not shown), and the collection pipe 17 is designed to collect the amount of collected gas. A damper 18 for control is interposed.

The configuration up to this point is the same as the conventional one, but the following configuration is added in this embodiment.

That is, as shown in FIG. 2, a mixer 19 is provided outside the cooling tower 1, and this mixer 19 has supply pipes each having valves 20, 21 and 22 interposed therein. 23, 24, 25, steam or water, N2. It is a trap so that air etc. can be supplied. Through this mixer 19 conduit 26, it communicates with an annular conduit 27 arranged on the outer periphery of the cooling tower 1, and this conduit 27 protrudes from the cooling tower 1 at intervals in the circumferential direction. Multiple communication pipes 28
．． It communicates with the lower part of the prechambers 4 via 28....

A conduit 30 with a knob 29 interposed therein leads out from the upper end of the prechamber 4, and this conduit 30 is connected to the zein 1
It communicates with the gas duct 10 on the upstream side of No. 2.

Furthermore, a gas component detection device is attached to the gas duct 10.

According to the above-described configuration, at least one of the knob 21 of the supply pipe 24 and the knob 22 of the supply pipe 25 is opened, the knob 20 of the supply pipe 23 is opened, and the communication pipe 28 is opened.
From Bricciano? 4 is supplied with a mixture of at least one of N2 gas and air with moisture. Note that when this mixed gas is supplied and coke is introduced into the brie chamber 4, the gas escapes, so it is necessary to stop or reduce the amount.

By supplying the mixed gas, there is a gap of 20+0.
→ 200 0+H,O-+oo+ns reaction occurs and 00. A gas containing a large amount of Ha is generated. Then, open the valve 29 to release this gas into the conduit 30.
is supplied to the gas duct 10 and mixed with the circulating gas. Therefore, this circulating gas is 00,H.

Since the combustible components increase, the gas after heat exchange in the zein may be recovered from the recovery pipe 17.

Note that since the amount of circulating gas increases by the amount of mixed gas, the amount of steam generated in the zein 12 also increases. Therefore, the gas supply from the above-mentioned communication pipe 28 prevents substantial deterioration of the coke and also prevents the pre-chamber from deteriorating. In order to ensure uniformity of temperature distribution inside the pipe 4, the reaction with coke must be made uniform, but if only moisture is blown into the pipe 4, the reaction near the communication pipe 28 will be excessive. Therefore, as described above, it is desirable that Nt or air be mixed and then uniformly supplied from the plurality of communication pipes 28.

Furthermore, when air is used for mixing in the mixer 19, CO increases due to O2 in the air, so depending on the circulating gas component detected by the component detection device, air, N2. The circulating gas components can be adjusted by changing the water mixing ratio.

Furthermore, 00. H,,oo! Since the following reversible reaction is carried out with , H,0 carbon coke, the moisture content in the coke can be controlled by adjusting the circulating gas components.

0+H, O←OO+H.

a+co, a200 00+H Tomi 0#00 Tomi+H3 Unfortunately, the circulating gas contains V remaining in the coke.

M (volatile matter) is mainly composed of H, which is added by charging the red hot coke to the british tank 4. Therefore, when input timing is concentrated, the circulating gas components (particularly Hz) fluctuate greatly, but by adjusting the supplied moisture in accordance with the fluctuations in the Hz, it is possible to obtain a circulating gas with less fluctuation in each component.

In addition, 00. In addition to increasing the H, component and recovering it as fuel gas, air is added into the gas duct) 10. It is also possible to combust the Hz and then recover it as steam in the zeira 12.

3 and 4 show an embodiment of the invention as claimed in claim 2 of the present application, and this embodiment will be explained below, but it is similar to FIGS. Similar structures are designated by the same reference numerals in the drawings, and their explanations will be omitted.

Similarly to the first embodiment described above, this embodiment also includes air, N,
A mixed gas in which water is added to at least one of the above is supplied into the burichanno 4 to cause a reaction with the red-hot coke.In this embodiment, the mixed gas is supplied downward from the top of the burichanno 4. I live as long as I do.

For this purpose, the conduit 31 communicating with the mixer 19 communicates with a hollow support 32 installed laterally at the upper end of the cooling tower l, and this support 32 supports a bell member 33 having an opening at the lower end. ing.

Therefore, the mixed gas from the mixer 19 is transferred to the support 3
2 through the bell member 33 into the chamber 4.

In this way, the mixed gas is supplied into the coke cylinders 4 through the bell member 33 through the coke d porous resistor, so even if the bell member 33 is not provided, the mixed gas can be relatively uniformly mixed with coke. reaction, but if there is particle size segregation in the coke, a uniform reaction will be inhibited, so the bell member 33
This is because the reaction between the mixed gas and coke is made more uniform.

According to the above-described structure, the same effects as in the first embodiment described above can be achieved, but in this embodiment, 0.00. H! Since the gas with increased acid content is supplied from the gas chamber 8 to the gas duct 10 through the openings 9, 9, . . . together with the circulating gas, the structure such as the conduit 30 shown in FIG.

As explained above, in the coke dry extinguishing method according to the present invention, a gas containing moisture added to at least one of air and N is supplied into a brie chamber, and a gas containing a large amount of COe Hz e is produced by reaction with red-hot coke. (11) This has an excellent effect in that the fuel gas can be efficiently recovered without inhibiting the recovery of sensible heat by I-Ira.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram showing a first embodiment of the coke dry extinguishing method according to the present invention, FIG. 2 is a perspective view of the main part of FIG. 1,
FIG. 3 is a schematic explanatory diagram showing a second embodiment of the present invention, and FIG. 4 is a perspective view of the main part of FIG. 3. DESCRIPTION OF SYMBOLS 1...Cooling tower, 3...Cooling room, 4...Brie chamber, 10...Gas duct, 12...-Zeira, 17.
...Recovery pipe, 19...Mixer, 26.31...Conduit, 33...Bell member. (12)

Claims (1)

[Scope of Claims] 1. Red-hot coke is introduced into the silicone pipes above the cooling chamber in the cooling tower, and a cooling gas is circulated within the cooling chamber through an external gas duct, and the circulating gas is used for cooling. In a coke dry extinguishing method in which red-hot coke is cooled, a gas consisting of at least one of air and N with water added is supplied into the prechamber from its outer wall, and reacts with the red-hot coke to produce fioo, H, A coke dry extinguishing method characterized in that a gas containing a large amount of gas is generated, and this gas is passed through a conduit from the upper part of the prechambers to join with circulating gas in a gas duct. 2. Coke drying system in which red-hot coke is charged into a pre-chamber above the cooling chamber in the cooling tower, and cooling gas is circulated within this cooling chamber via an external gas duct, and the red-hot coke is cooled by this circulating gas. In the fire extinguishing method, a gas consisting of at least one of air and N with water added is supplied into the interior of the tank from the upper end, and a gas containing a large amount of fioo and H is produced by reaction with red-hot coke. A coke dry extinguishing method characterized in that coke is combined with circulating gas in a cooling tower.