JPS61143488A - Coke dry extinugisher - Google Patents

Abstract

PURPOSE:The tltled extinugisher air is mixed with incombustible gas to be fed into the cooling chamber to allow the combustible gas in the incombustible gas to combust in the cooling chamber whereby the circulated gas is made incombustible by no use of a combustion chamber, resulting in reduction of installation costs and operation costs. CONSTITUTION:Air 18 is blown into the incombustible circulation gas 7 from the waste-heat boiler 9, preferably on the inlet side of the cooling chamber 5 using a air-feeding means consisting of air-feeding tube and blower 17. then, the circulating gas containing air is fed into the cooling chambers 3-5 to cool the red-heated coke 2 passing through the chambers by the movement of grate 6. Further, the actions of high temperature of red-heated coke 2 and of oxygen from the air mixed into the circulation gas allow the combustible gases such as hydrogen or carbon monoxide to combust whereby the circulation gas is made incombustible.

Description

Detailed Description of the Invention <Industrial Application Field> The present invention is directed to a coke dry quenching system (CDQ, abbreviated as Coke Dry Quencher) that extinguishes and cools red-hot coke with non-flammable gas and also obtains high-temperature non-flammable gas. related to the improvement of

<Prior art> Coke dry extinguishing equipment extinguishes and cools red-hot coke fired in a coke oven using nonflammable gas (inert gas) as a cooling medium, and also extinguishes heat exchange between coke and nonflammable gas. This is a series of plants in which highly heated nonflammable gas is obtained, this high temperature gas is used to generate steam in a waste heat boiler, and the steam is used to generate electricity.

As a typical example of this coke dry extinguishing equipment,
The figure shows a circular grate type. Hopper 1
The red-hot coke 2 is supplied onto a circular grate (pallet) 6 that rotates horizontally inside a cooling chamber 3, 4.5 that is divided into about 2 to 4 (here, three) parts, and as the grate 6 moves, Each chamber is passed through 3.4°5. Circulating gas 7 is passed through each cooling chamber 3, 4, 5 as a cooling medium, and the circulating gas 7 extinguishes and cools coke 2 in each cooling chamber 3, 4, 5, and the coke 2 becomes cooled coke 2a. Then, it is discharged from the discharge port 8. On the other hand, the circulating gas 7n, which has become high temperature due to heat exchange with the red-hot coke 2, is supplied to the waste heat boiler 9 and used as a steam generation source, and the cooled circulating gas 7 is transferred to the cooling chambers 3 and 4.5. is supplied in circulation.

The circulating gas 7 is a nonflammable gas as described above.

However, uncarbonized hydrogen gas (H2
), - Carbon oxide gas (CO) is generated from red-hot coke, or coke and carbon dioxide gas (CO2) and coke and water vapor (H2O) react, resulting in the following (11
(As shown in equation 21, CO and horse gas are generated.

C (Coke sulfur C02 = 2 GO - (1) C (Coke) + HO = CO + sound, (2) And if the operation continues in the state where CO and horse gas are generated as described above, the circulating gas 7 The carbon dioxide content and COa content become high, and the circulating gas composition becomes flammable, which may be unfavorable from a safety standpoint.

Therefore, in order to ensure that the composition of the circulating gas is always nonflammable, conventionally, for example, a catalytic combustion chamber 10 is provided before the waste heat boiler 9, and an appropriate amount of the high-temperature circulating gas 7a is passed through the combustion chamber 10. While blowing air 11, combustible components in the circulating gas were combusted into nonflammable gas. In the figure, 12 is a blower 13 that sends the circulating gas 7, a blower 13 that sends air 11 to the combustion chamber 1o; 14 is a cyclone that removes dust from the high-temperature circulating gas 7; 1s is the circulating gas that has exited the waste heat boiler 9; This is part of the burrito gas (released gas) of No. 7.

<Problems to be solved by the invention> However, in the above method, it is necessary to provide a combustion chamber with a catalyst, and it is necessary to replace the catalyst when it reaches the end of its life, which increases construction and operating costs. There is a problem.

Means for Solving the Problems> The present invention was made to solve the above problems, and an object of the present invention is to make circulating gas nonflammable without using a combustion chamber.

The configuration of the present invention to achieve the above object is to pass a grate supplied with red-hot coke into a cooling chamber, supply nonflammable gas to the cooling chamber to cool the coke, and recover heat using the nonflammable gas. In coke dry extinguishing equipment, the nonflammable gas that has become high temperature by removing heat is used as a heat source, and then the nonflammable gas that has become low temperature is circulated and supplied to the cooling chamber. The present invention is characterized in that an air supply means is provided to mix air into the nonflammable gas, and the combustible gas mixed in the nonflammable gas is burned in the cooling chamber to become nonflammable gas.

Effect〉 When an appropriate amount of air is blown into low-temperature nonflammable gas using an air supply means, the sound of undry distillate generated by coke and CO gas or C+C02=2CO,C+H2O
=C0+ The noise and co gas generated by the reaction of pigeons, etc.
High temperature part in cooling chamber TeH2+702=H20,CO+7
The 02=CO2(+) reaction automatically turns it into a nonflammable gas.

Embodiment FIG. 1 shows a schematic structure of a coke dry extinguishing equipment according to an embodiment of the present invention.

3.4.5 is a cooling chamber arranged in an annular manner (shown on the same plane in the figure), in which an annular circular gray 1 (pallet) 6 is circulated. Top cooling chamber 3
A hopper 1 for supplying red-hot coke 2 onto the grate 6 is provided on the front side of the grate, and cooled coke 2a is discharged to the rear of the cooling chamber 5 at the rearmost part.

A discharge port 8 is provided for this purpose. Reference numerals 7 and 7a indicate circulation supply paths for nonflammable circulating gas, and the circulating gas 7 that has exited the waste heat boiler 9 is sent to each cooling chamber 3 p a , s by a blower 12 .
The red-hot coke 2 is cooled through the cooling chamber 3°4.5, and the high-temperature circulating gas 7a is directly sent to the waste heat boiler 9.
supplied to In addition, in the figure, 14 is a cyclone provided on the outlet side of the waste heat boiler 9, and 15 is a discharged gas.

In this embodiment, the combustible gas concentration in the circulating gas 7 (mainly horse and carbon
An analyzer 16 is provided to measure the O gas concentration. or,
On the inlet side of the cooling chamber 5, an air supply pipe and a blower 17 are provided in the supply path of the circulating gas 7 as air supply means.

That is, the combustible gas concentration in the low-temperature circulating gas 7 discharged from the waste heat boiler 9 is measured, and the blower 17
Air 18 is blown into the circulating gas 7 at the step. When the coke reaches a high temperature portion such as the first cooling chamber 3 among the cooling chambers 3, 4.5, the temperature of the circulating gas 7 rises, and the oxygen in the circulating gas 7 blown into the cooling chambers 3, 4. The noise generated in 5 reacts with combustible gas such as CO gas, resulting in -cHO
and CO2 gas, which becomes a nonflammable gas. In general, the ignition temperature of pigeon and CO2 gas is about 600-650°C, whereas the temperature of circulating gas in high-temperature parts such as the first cooling chamber 3 is usually operated at 700-85″θ°C. Therefore, the combustion reaction of CO gas and CO gas progresses sufficiently, and by blowing air and passing it between the particles of red-hot coke 2, the combustible gas can be converted into non-flammable gas without using a catalyst as in the conventional method. It can be made into gas.

In the above embodiment, the coke cooling chamber (heat exchange chamber with circulating gas) is divided into three chambers (first, second, and third cooling chambers 3, 4, and 5), and the number of divisions is determined by the red-hot coke temperature. , the temperature of the high-temperature circulating gas 7a to be obtained, the temperature of the cooled coke 2a, etc.
divided into In addition, in this embodiment, the air 18 is
Although the circulating gas 7 is blown into the circulating gas 7 from the front side of the cooling chamber 5, the point where the air is blown is not limited to this, and may be in front of the second cooling chamber 4 or the first cooling chamber 3. In fact, the above-mentioned combustion reaction (H,,+T02=H20°CO+
Most of the TO2-C02) progresses in the first cooling chamber 3, which is a high temperature section, so there is no problem in blowing air into the circulating gas 7 before the first cooling chamber 3 as described above. , for the purpose of sufficiently mixing the combustible components (H2, CO) in the circulating gas 7 with air (oxygen in the air), for example, by blowing from the front of the second cooling chamber 4 or the third cooling chamber 5. is desirable. That is, the second. Third cooling chamber 4,
In No. 5, since the temperature of the coke and the circulating gas is low, the combustion reaction hardly progresses, but while the circulating gas 7 passes between the coke particles, it mixes well with the blown air.

Specific example> The coke dry extinguishing equipment according to the present invention is adopted, and by blowing air into the circulating gas, the combustible gas concentration (total concentration of H2 and CO) in the circulating gas is determined as shown in the table below. ,
The concentration was 2.8 vo1%, and safe operation was possible below the explosive limit concentration (approximately 4%).

<Effects of the Invention> According to the coke dry fire extinguishing equipment according to the present invention, combustible components mixed in nonflammable gas can be made nonflammable without using a catalyst. Since no catalyst is used, construction and operating costs are reduced. In addition, since the circulating nonflammable gas can always be maintained nonflammable, operational safety is ensured.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an embodiment of coke dry extinguishing equipment according to the present invention, and FIG. 2 is a schematic diagram of a conventional coke dry extinguishing equipment. In the drawing, 2 is the red hot coke, 3.4.5 is the cooling chamber 6 is the grate, 7 is the circulating gas, 9 is the waste heat boiler, 16 is the analyzer, 17 is the blower, and 18 is the air.

Claims (1)

[Claims] A grate to which red-hot coke is supplied is passed through a cooling chamber;
A coke dry system in which nonflammable gas is supplied to the cooling chamber to cool the coke, and heat is recovered by the nonflammable gas, and the heated nonflammable gas is used as a heat source and then circulated and supplied to the cooling chamber. In fire extinguishing equipment, an air supply means is installed to mix air into the nonflammable gas supplied to the cooling room, and the combustible gas mixed in the nonflammable gas is combusted in the cooling room to become nonflammable gas. Coke dry extinguishing equipment featuring: