JPH01287195A - Production of formed coke - Google Patents

Abstract

PURPOSE:To obtain the title coke with mechanical strength comparable to that of chamber oven coke, with reduced dry distillation thermal energy cost, by using part of crude coke gas for cooling red-hot formed coke and another part of said gas as a heat source for coke dry distillation. CONSTITUTION:Firstly, coal is put to dry distillation in a direct heating-type formed coke oven, and the gas generated is cooled and freed from coal tar and/or ammoniacal liquor, thus producing crude coke gas. Thence, part of said gas is used for cooling red-hot formed coke, and another part of said gas is introduced into the dry extinguishing unit equipped in a chamber oven- type coke oven followed by temperature rise, and then used as a heat source for the coke dry distillation in said formed coke oven.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to dry fire extinguishing equipment (Coke Dry Quench
Cher.

The present invention relates to a method for producing molded coke by effectively utilizing the recovered heat obtained from the process (hereinafter sometimes abbreviated as CDQ).

[Prior Art] The purpose of manufacturing coke for blast furnaces is to supply coke to the blast furnace that is suitable for efficient performance of blast furnace operations and whose quality is stable.

Conventionally, as a method for producing such blast furnace coke, a method using an indoor coke oven has been common. The method has been improved year by year, and in recent years, the by-product recovery method is typical. To explain the outline, coking coal is first charged into a carbonization chamber, carbonized using the combustion heat of fuel gas introduced into the fuel chamber adjacent to the carbonization chamber as a heat source, and the volatile gas generated there is released. , extracted as red-hot coke. The generated red-hot coke is transported to the CDQ, where it is cooled by heat exchange with an inert gas, and becomes blast furnace coke. In this case, in the CDQ, the sensible heat of the red hot coke is absorbed by the inert gas and recovered in the boiler, and the cooled inert gas is returned to the CDQ by the circulation blower.
will be pumped to. The volatile gas generated during the carbonization process is collected in an air collecting pipe, cooled and separated from coal tar (hereinafter referred to as tar), and then sent to a refining device where it is recycled into fuel residue, light oil, or by-products such as ammonia. Fresh products are collected.

The coke produced in such a chamber-type coke oven is amorphous lump coke, and a method for producing so-called charcoal shaped coke is known. This consists of a process in which powdered coking coal is press-molded into pulverized coal in a cold or hot manner, and then carbonized at high temperatures to form coke.The carbonization equipment typically uses a shaft furnace. be.

[Problems to be Solved by the Invention] Unlike the method using a chamber coke oven, the molded coke production method has the advantage of being able to use non-caking coal, but it naturally requires a heat source during high-temperature carbonization. Conventionally, a dedicated heat source for molded coke production was required.

The present invention improves coke strength in the same way as indoor oven coke by combining CDQ installed in indoor oven coke oven equipment with a direct heating forming coke oven, and reduces carbonization cost. The purpose of the present invention is to provide a method for producing molded coke using a complementary indoor furnace.

[Means for Solving the Problems] The present invention cools the gas generated when carbonization is performed in a direct heating molded coke oven, removes coal tar, ammonium water, etc., and then converts the gas into crude coke gas. A part of the crude coke gas is used for cooling the red-hot molded coke, and another part is introduced into the CDQ installed in the indoor coke oven equipment to raise the temperature, and then cools the coke in the molded coke oven. The purpose is to use it as a heat source for carbonization.

[Operations and Examples] The coke oven gas generated by carbonization in the coke oven is
After being cooled and separating tar and ammonium water to produce crude coke oven gas (hereinafter sometimes referred to as crude COG), light oil or ammonia is recovered as a by-product, and the residue is recovered as a fuel. Gas liquids were generally disposed of after being rendered harmless in wastewater treatment equipment.

The main point of the present invention is that a part of the crude COG produced in the molded coke oven is used to cool the red-hot molded coke, and another part of the COG is introduced into the CDQ installed in the indoor coke oven equipment. It is used as a heat source for carbonization in a formed coke oven.

The present invention will be explained based on the process diagram of the embodiment shown in FIG. (within the technical scope of the present invention). (1) Non-caking coal and caking coal are mixed together with a binder, and then hot-pressing is performed. This is introduced into a shaped coke oven and subjected to high-temperature carbonization in the upper part of the oven. The shaped coke oven of the present invention may be of a direct heating type. In this example, a direct heating type shaft furnace was used. During carbonization, heated gas at 610° C. was introduced from the tuyere at the top of the furnace to preheat the raw coal, and then heated gas at 900° C. was introduced into the carbonization section to carry out carbonization.

(2) During the coal carbonization process, COG generated by the decomposition of volatile matter in the coal passes through a riser pipe and is collected in ammonium water/tar separation equipment, where it is cooled by spraying ammonium water and separated from tar and ammonium water. is separated and becomes low-temperature crude COG. A part of the low-temperature crude COG is CD01, which is installed in the indoor coke oven equipment.
The other part is sent to the coke cooling part at the bottom of the molded coke oven, and the remaining part is taken outside and used for recovery of light oil, ammonia, and other by-products. In addition, for the purpose of temperature adjustment of the high temperature crude COG for preheating the formed coke raw coal, a part of the above-mentioned low temperature crude COG can be added to the high temperature crude COG.

In this example, the temperature of the low temperature crude COG gas obtained by cooling the COG gas was 55°C.

(3) The low-temperature crude COG sent to the CD01 section cools the red-hot coke produced in the indoor coke oven to produce coke and recovers the sensible heat of the red-hot coke. The heat recovery from red hot coke using low temperature crude COG can be carried out by a system of heat exchange between red hot coke and inert gas and heat exchange between inert dregs and crude COG.

The red hot coke temperature in this example was 1050°C, and the outlet temperature of the high temperature crude COG in CDQ was 900°C. By passing through the CDQ and being slowly cooled, the produced coke improved in drum strength (DI?:> by 0.2) and in post-reaction strength (RSI) by 1.3.

This corresponds to ΔRo; 0.08, and highly caking coal can be saved by this amount.

By the way, assuming that the amount of red-hot coke (1050°C) relative to CDQ is 150t/hr, the amount of low-temperature phase C0G (55°C) per ton of red-hot coke is 9
C when changing from 0ONm3 to 150ONm3
The temperature of the high quality crude COG obtained at the DQ outlet was 600 to 950°C, as shown in FIG.

(4) A portion of the high-temperature crude COG heated to E-temperature by heat exchange in the CDQ is introduced into the carbonization section as a heat source for carbonization in the shaped coke oven. In addition, the other part can be used to preheat the coking coal for forming coke by adjusting the temperature by mixing a portion of ammonium water and low-temperature phase COG after tar separation, and then introducing it into the top of the coke forming coke oven. I'll come. The remaining high-temperature crude COG is sent to a boiler for heat recovery.

The crude COG after heat recovery can be combined with the low-temperature phase COG after ammonium water and tar separation, and can be used for recycling gas and by-product recovery.

As already mentioned, the temperature of the gas used as the carbonization heat source in this example was 900°C, and the temperature of the gas adjusted as a preheating source for the formed coke raw coal was 610°C.

By the way, red-hot coke (1050℃) generated from an indoor furnace
One ton of COG is charged into CDQ and the high temperature crude COG has an outlet temperature of 90
An experiment was conducted using this as a source of carbonization of molded coke at a temperature of 0° C., and the relationship between the resulting molded coke production amount and the required amount of heat was investigated. The results are shown in Figure 3. In the figure, the straight line (a) is a graph showing the relationship between the production amount of molded coke and the amount of heat required for its production when the carbonization temperature is 900 ° C.
Straight line (b) is a graph showing the sensible heat of the carbonization heat source at the CDQ outlet. Therefore, the intersection of straight lines (a) and straight lines (b) was the maximum production amount of molded coke per ton of glow chamber furnace coke at a carbonization temperature of 900°C, which was 450 kg as is clear from the graph. Therefore, when the production amount of molded coke is 450 kg, the vertical difference between straight line (b) and straight line (a), for example, the amount of heat shown by line segment (C), is recovered by the boiler and used for power generation, etc. It can be used for other purposes.

(5) The low-temperature phase COG introduced into the lower part of the shaped coke oven is used to cool the red-hot shaped coke produced by carbonization. This COG can be extracted from the furnace and combined with low-temperature phase COG for preheating gas adjustment of formed coke raw coal.

In this example, the low-temperature phase CO for red-hot formed coke cooling is used.
The temperature of the COG was 55°C as described above, but the temperature of the crude COG extracted from the cooling back tilt was 620°C. Drum strength DI of formed coke produced? :; 94.1.
The reaction strength RSI is 60.3, and the indoor furnace coke (DI; 94.4. R3I, 59.0)
A product of almost the same quality was obtained. That is, since the red-hot molded coke in the present invention is slowly cooled by dry cooling using low-temperature phase COG, the amount of microcracks in the coke mass is reduced, and the coke produced in the room furnace is slowly cooled by dry cooling using CDQ. It is expected that the coke strength will be improved to the same extent as the above.

[Effects of the Invention] Since the present invention is configured as described above, it is possible to reduce the carbonization calorific cost in a shaped coke oven, and to obtain shaped coke having excellent coke strength comparable to that of room oven type coke.

[Brief explanation of the drawing]

Fig. 1 is a manufacturing process diagram of molded coke according to an embodiment of the present invention, and Fig. 2 is a graph showing the relationship between the amount of CDQ circulating gas and the CDQ output logaro gas temperature per 1 ton of red-hot chamber furnace coke in an embodiment of the present invention. , FIG. 3 is a graph showing the production amount of molded coke per ton of red-hot chamber furnace coke and the amount of heat consumed by carbonization.

Claims (1)

[Claims] Coal is carbonized in a directly heated molded coke oven, and the gas generated at this time is cooled to remove coal tar, ammonium water, etc. to produce crude coke gas, and then a portion of the crude coke gas is heated to red heat. Another part is introduced into a dry fire extinguishing device installed in a room furnace type coke oven equipment to raise the temperature, and then used as a heat source for coke carbonization in the molded coke oven. A molded coke manufacturing method characterized in that it is used.