JPS5859284A - Coke manufacturing unit - Google Patents

Abstract

PURPOSE:To control carbon deposition on the inner wall of a pipeline, reduce coking time, increase productivity and save energy consumption, by separating a gas generated in an early period of coke carbonization when a relatively large amt. of fine coal is formed. CONSTITUTION:Hydrous fine material coal 3 is preheated in a gas-stream transfer pipe 2 with a high-temp. crude coke oven gas and separated by a cyclone 6, etc. The coke oven gas is introduced into a chemical plant and the preheated coal is fed to a coke oven 12. In order to prevent oven press. from increasing at the peak of gas evolution in an early period of carbonization, the evolved gas is sucked into a low-temp. gas-collecting pipe 15 by steam or a high-press. ammonia water 13 and cooled, which reduces an amt. of carbon deposited on a high- temp. gas discharge pipe line 1. Then a shut-off valve 16 is opened to send a gas to a high-temp. gas collecting pipe 17, and simultaneously a low-temp. gas collecting pipe 15 is closed by water seal. Until shutdown, a high-temp. crude coke oven gas from each coke oven is mixed with each other in the high-temp. gas collecting pipe 17, introduced into the high-temp. gas discharge pipe 1, and used for drying or preheating coal.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coke making device, in which raw coal for coke production is dried or preheated using high-temperature crude coke oven gas generated from a coke oven, and then loaded into a coke oven. The purpose is to produce coke.

As is well known, drying or preheating coal prior to coking it in a coke oven provides a number of advantages. For example, the time required to turn coal into coke in a coke oven is shortened, which increases productivity. Moreover, high quality 9 coke can be obtained from the coal subjected to such heat treatment.

Furthermore, the total amount of energy consumed in preheating and coking is reduced by the amount of energy consumed in coking without preheating.

Coaltek method, Pr
ecarbon method, thermocharge method, U,
S. There is a 5-teel method. For example, Thermoch
In the arge method, coke oven gas or natural gas is combusted in a combustion chamber, circulating gas is mixed with the gas, and after adjusting the gas amount and gas temperature, this gas is introduced into a spray chun. The gas temperature is finely adjusted by water spray to make it a high-temperature gas of approximately 200°C, and preheating treatment is performed by bringing it into contact with powdered coal in two airflow transport pipes based on the Shirataki principle.The coal is dried as described above. The gas whose temperature has been lowered after being used for preheating treatment is used. This preheated coal is then separated from the gas stream and subjected to a rounding oil addition that reduces coal carryover during charging into the coke oven.

Also, a group of inventors first filed a patent application No. 55-62183.
The heat recovery method for coke oven gas proposed in No. 54-154404 (Japanese Unexamined Patent Publication No. 54-154404) [7] uses high-temperature crude coke oven gas generated from a coke oven or a mixed gas of this and a gas containing almost no oxygen. The coal is dried or preheated by this method, and the heat of the crude coke oven gas is thereby recovered, and the tar contained in the crude coke oven gas is separated by adhering to the coal. According to this method, the Thermoeharge
It had the following advantages over the law. ■Energy consumption is greatly reduced because the heat retained in crude coke oven gas, which is normally not used and thrown away during coal heat treatment, is effectively used.

■After heat treatment, the coal has tar attached to it, so there is no need to add oil, and air pollution caused by mating can be prevented. ■The tar attached to the coal acts as an adhesive, improving coke strength.

However, although the method disclosed in Japanese Patent Application No. 55-62185 has certain effects, the high-temperature crude coke oven gas used is discharged from the coke oven together with fine coal powder. The problem of so-called carbon trouble, in which fine coal powder adheres to the inner walls of the pipes through which it passes, and some of it thermally decomposes and sticks and accumulates, was unavoidable. Subsequent research has revealed that this carbon trouble occurs as follows. That is, when the temperature of the crude coke oven gas passing through the pipe is in a temperature range of 500°C or higher, a portion of the hydrocarbons contained in the crude coke oven gas undergoes thermal decomposition and becomes carbon, which adheres to the inner wall of the pipe. . In the temperature range of 500 to 500°C, the tar contained in the crude coke oven gas actively condenses and thermally decomposes, but as the gas comes into contact with the rapidly moving coal, it tends to adhere to the inner walls of the piping, causing condensation. Tar adheres to coal and moves. Since condensed tar does not decompose thermally in a temperature range of 500° C. or lower, it moves in a liquid state after contact with coal, entraining fine coal powder, and although it adheres to the inner wall of the pipe, it does not stick or accumulate.

The present invention solves the problem of carbon trouble on the inner wall of the piping, which is a problem faced by the coke oven gas heat recovery method of the above-mentioned Japanese Patent Application No. 55-62183, during the early stage of coke dry distillation when a relatively large amount of coal fines is generated. Separating the generated gas is an improvement over K, which results in shortening coking time, increasing productivity, and saving energy consumption3.Also, it is unavoidable in relatively long-term operation. Carbon fixed and accumulated on the inner wall of the pipe is removed periodically by installing a 4.4 f, which makes it easy to remove carbon from the inner wall of the pipe.

That is, the gist of the coke manufacturing apparatus of the present invention is as follows: a captive coal feeding device, an air flow transport pipe connected to the coal feed device and having a high temperature gas inlet at the bottom, and a gas flow transport pipe connected to the top of the air flow transport pipe. (B) A coke oven equipped with piping for discharging the gas generated in the initial stage of dry distillation and piping for discharging the high-temperature gas generated thereafter via a shutoff valve, and discharging the high-temperature gas. This coke manufacturing apparatus is characterized in that it is provided with the above (A) and (B), a high temperature gas supply device in which one end of the pipe is connected to the high temperature gas inlet of the air flow transport pipe.

Further, a carbon combustion device for burning and removing carbon adhering to the inner walls of the high-temperature gas discharge pipe and the air flow transport pipe is attached to the high-temperature gas discharge pipe, as claimed in claim 1.
This is the coke manufacturing apparatus described in Section 1.

Next, the coke manufacturing apparatus of the present invention will be explained based on the embodiment shown in FIG. (13 is a normal coke oven, 6υ is a coal loading car, (2) is a coal tower hopper, (9)
(8') is a transport device or chain conveyor, and (8') is a screw feeder, both of which are commonly used. What is important in the present invention is the addition device 0 of steam or high-pressure ammonium water added to the riser pipe a◆ of the coke oven hot water a◆ in order to avoid a rise in furnace pressure at the peak of gas generation in the early stage of dry distillation, and the following quantitative air collection pipe. A low-temperature gas piping system such as a low-temperature gas exhaust pipe (15') following the pipe is provided independently and water-sealed, and a shutoff valve a11 is installed separately from this piping system at the bottom of the riser pipe a. A high-temperature gas piping system consisting of a high-temperature gas collection pipe aη and a high-temperature gas discharge pipe (1) following the high-temperature gas collection pipe aη is provided through the high-temperature gas discharge pipe (1). 2) high-temperature gas inlet (two in series). The above device is referred to as a high-temperature gas supply device in the present invention - the above-mentioned (21)
The high temperature gas inlet (2') is provided at the bottom of the Fi airflow transport pipe, and the bi gas inlet (2')
Powdered raw material coal (3) is supplied to the coal feeder through a disperser (5) slightly above the installation position of the coal feeder. At the top of the airflow transport pipe (2), there is a cyclone (6) for separating gas and coal that is continuous with this.This cyclone (6)
) may be a so-called multi-cyclone (7) consisting of a plurality of cyclones as the case may be. The above device is referred to as a coal heat treatment device in the present invention.

(8) is a blower, and the high-temperature air collection pipe (1η→high-temperature waste discharge pipe <1) whose pressure is controlled to about +6 Aq
→ Air flow transport pipe (2) → Crude coke oven gas is sucked through the cyclone (6) or multiclone (7) route, so the system is kept at a negative pressure, and the pressure in front of the blower (8) is between -800 and -12
The negative pressure is 000 Aq. On the other hand, the crude coke oven gas pressurized by the blower (8) is sprayed and cooled with ammonium water by the spray Q'J in the Susley chamber a.
The temperature reaches 0 to 90C and is sent to a chemical factory outside the system for recovery of byproducts. The above is the result of the coke manufacturing apparatus of the present invention.

Further, the component shown by chain lines in FIG. 1 is a carbon combustion device. C11+ is a combustion chamber in which fuels (1) such as coke oven gas, blast furnace gas, and natural gas and combustion air (2) are combusted, while coke oven combustion waste gas,
Oxygen concentration of blast furnace hot blast combustion waste gas, etc. is 5- or less, temperature is 3
Combustion waste gas (2) of 00°C or lower is introduced and mixed with the combustion gas, oxygen +11 [4-10], temperature 500-70
Obtain combustion gas at 0°C Kv41Jk, and use it in a coke oven that has been set up in advance in 9 ovens (after opening the upper top cover (25') of riser pipe A4, install it continuously in riser pipe No. 0). The above-mentioned high-temperature air collection pipe aη → high-temperature gas exhaust pipe (
1) → The carbon adhering to the inner wall of the pipe leading to the lower part of the air flow transport pipe (2) is burnt and removed while avoiding local heating. In addition, (2) is a bag filter-1 (2) is a chimney.

The exfoliated carbon, oxidized ash, gas, etc. that rose up the airflow transport pipe (2) when burning and removing the attached carbon are removed from the airflow transport pipe (2).
2) is supplied with water in a mist form from the sprinkler system K installed on the side, and is cooled to below the heat-resistant temperature of the bag filter (2), which is then sucked into the airflow transport pipe by the blower (8). (
2) and ascend the Cyclone (6) or Multichron (7)
), most of the entrained powder is separated and removed, the remaining powder is further removed by the bag filter (c), and then the chimney (
The coke production apparatus of the present invention has the above-mentioned configuration, but in order to produce coke with this apparatus, the temperature of 400 to 800 ℃ crude coke oven gas is made to flow in from the inlet (2') of the air flow transport pipe (2) installed vertically, while the coal feeder (4) is fed with a particle size of 6 mm or less and 80 to 85 mm. Powder moisture content -6~
Raw coal containing 12% is cut out from a constant violet cutting mechanism, such as a screw feeder (equipped in the coal feeder), and fed to the pneumatic transport pipe (2) via a disperser (5). The crude coke oven gas is transferred upwards while exchanging heat, removing all the moisture it contains, and performing a so-called preheating operation to heat it to a predetermined temperature. At the same time, tar that starts to condense at about 520°C is deposited on the raw coal. During this time, tar also adheres to the inner wall of the airflow transport pipe (2).

It does not grow because it is scraped away by the powdered coal transported by air currents. The heat exchange rate of this coal gradually decreases as it moves upwards, and it is separated from the crude coke oven gas in a cyclone (6) or multichrone (7). Dry or preheated coal with a temperature of 90-150° C. is thus obtained, while the temperature of the coke oven gas is reduced to 150-200° C. and, as already mentioned, the suction of the blower (8) causes the spray chamber to <-as rtc. It is further cooled and sent to a chemical factory outside the system.

The coal that has undergone heat treatment in the coal heat treatment equipment is transported through a transportation device (9) by a screw feeder (8').
It is sent to the coal tower hopper ring and cut to the coal loading car QIl. A coke oven a that requires paper charging into this coal loading car aυ
2 is transported and charged. During charging into a coke oven and for a short period of time after charging, the evaporation and thermal decomposition of the tar adhering to the raw material coal and the thermal decomposition of the coal occur intensely, resulting in a temporary peak of gas generation. To avoid the rise in furnace pressure due to this peak, the generated gas is sucked into the low-temperature air collection pipe 9 through the riser pipe a◆ using steam or high-pressure ammonium water ti3.
Cooling. This is to reduce the amount of carbon deposited on the high-temperature gas exhaust pipe (1), which will be described in the next section, due to the large amount of coal accompanying the gas generated during this period. After this period, the score is O1! The rising pipe port 4 and the high-temperature air collecting pipe 07) are opened, and at the same time, communication between the rising pipe (14) and the low-temperature air collecting pipe 09 is cut off by a water seal. After that, the high-temperature crude coke oven gas generated from the coke oven 03 remains at a high temperature until it reaches the flue, and the high-temperature crude coke oven gas generated from the six furnaces forming the furnace group with the high-temperature air collecting pipe αη. The gas is mixed with and averaged to become a gas with less fluctuation in gas temperature and gas composition, which is guided to the high-temperature gas discharge pipe (1) and used for drying or preheating coal as described above. By providing a low-temperature air collection pipe in addition to a high-temperature air collection pipe as shown below, gas leakage from the coke oven due to the rise in oven pressure during coal charging and immediately after coal charging is prevented. At the same time, the amount of carbon adhering to the inner walls of the high-temperature air collection pipe fiD and the high-temperature gas discharge pipe (1) is reduced.

In Fig. 1, two air collection pipes, a low temperature air collection pipe a9 and a high temperature air collection pipe 0η, are connected to one riser pipe a◆, and one riser pipe 4 is connected to the machine side and the coke side, respectively.
The air collecting pipes may be connected to each of the air collecting pipes.

Furthermore, in order to air-transport powdered coal in the air-flow transport pipe (2), a gas flow velocity higher than the terminal velocity of the coal is required.

However, the generation of crude coke oven gas-1 is basically determined by the production plan and the operating rate of the coke oven, but the amount of generated gas fluctuates over time during operation, and if trouble occurs, the fluctuation range "FisK" However, despite such fluctuations in the amount of gas generated, it is necessary to secure the amount of gas for the airflow transport mentioned above.For this purpose, a gas circulation pipe (as far as possible) must be installed after the blower (8). ) and one end thereof is connected to the high temperature gas discharge pipe (1) to replenish the gas amount.

The coke (2) at a temperature of about 1000°C produced after 12 to 16 hours of carbonization is sent to an extruder (not shown) K.
Therefore, it is pushed out and sent to the extinguishing process - When coke production is carried out in this way, carbon adheres to the inner wall of the pipe from the crude coke oven gas outlet of the riser pipe Q4) to the lower part of the air flow transport pipe 2. As it accumulates, it is necessary to remove this carbon at regular intervals. Although this deposited carbon is heated to 600 to 800° C. on the inner wall of the tube, when it comes into contact with air at room temperature, it does not ignite, but rather is cooled down. Therefore, combustion removal using room temperature air is not possible. If coke is heated to 500°C or higher and air is used, it will ignite, but the heat will locally become too high and cause damage to equipment. Therefore, in order to burn off the adhering carbon without causing local heating, a combustion chamber with an oxygen concentration of 4 to 10% and a temperature of 500 to 700°C may be used. In order to avoid this problem, as mentioned above, a gas adjusted to the above oxygen concentration and temperature is obtained in the combustion chamber, and this gas is sent to the upstream and downstream of the high temperature gas exhaust pipe (1) at the same time or by switching at the same time. Shift and send. The gas heading upstream passes through the high-temperature gas exhaust pipe (1) and the high-temperature air collection pipe (171) and reaches the riser pipe shaft of the coke oven, which is made up of 9. ) to dissipate the gas into the air.In this case, the attached carbon is oxidized and some of it is gasified,
A portion of the coke is separated into powdered coke and ash, which is carried along with the airflow and reaches the riser pipe a4.

As a result, the powdery substances with large particle sizes fall into the coke oven 0, and the others are released into the atmosphere and become K. The downstream gas passes through the hot gas discharge pipe (1) and enters the airflow transport pipe (2). The adhering carbon in this part is oxidized by the gas, and part of it is gasified, and part of it is peeled off to become powdered coke and ash, which are carried by the airflow and ascend up the airflow transport pipe (2). Since the airflow transport pipe (2) is equipped with a water sprinkler system, the gas is cooled by the PC, and the particle size is reduced in the cyclone (6) or multiclone (7) by suction from the suction blower (8). Large powder particles are separated and removed.
The gas passes through the bag filter (c) and is released into the atmosphere through the chimney (2).The outlet gas pipe of the combustion chamber Q may be connected to the high temperature gas discharge pipe (1) as described above, or it may be connected to the high temperature gas discharge pipe (1). It can be connected directly to the trachea afl. Furthermore, it may be branched and connected to the rising pipe 6◆.

The water sprinkler device (2) can also be used to adjust the temperature in the case of preheating coal.

Oxygen concentration at υ in the combustion chamber is less than 6 cm, temperature 600-8001
? :KFJ@ It is also possible to produce regulated combustion gas 17 and send this gas to the airflow transport pipe (2) to dry or preheat the coal.

Since the coke manufacturing apparatus of the present invention has the above-described configuration, the time for coking is shortened and productivity is increased accordingly, and high-quality coke can be obtained from heat-treated coal. It has been confirmed that it has various effects, such as lower energy consumption and lower energy consumption than conventional devices.

[Brief explanation of drawings]

Figure 1 is a system diagram of the apparatus of the present invention. (1) High-temperature gas exhaust pipe, (2) Air flow transport pipe, (2'
) high temperature gas inlet, (3) coking coal, (4) coal feeding device,
(5) Disperser, (6) Cyclone, (7) Multiclone, (8) Prower 1 (8') Screw feeder, (9
) Transportation equipment, (2) Coal tower dropper, Aυ coal loading car, O coke oven, O steam or ammonium water addition device, 04 riser pipe,
(c) Low-temperature air collection pipe, (15') Low-temperature gas discharge pipe, (
II! Valve cut, aη high temperature air collection pipe, Ql spray chamber, a good spray, 01 coke otJ combustion chamber, (2) combustion waste gas, fuel gas, ';'am burning air, (c) bag filter-1 (25 ') ), knob cover (a) chimney, (5) water sprinkler, (to) gas circulation piping. Agent: Patent Attorney: Toshi Sato, same: Saburo Kimura, same: Souji Sasaki, 531

Claims (2)

[Claims] (1) Coal equipped with a captive coal feeding device, an air flow transport pipe that is continuous to the coal feed device and has a high temperature gas inlet at the bottom, and a gas/coal separation cyclone that is continuous to the top of the air flow transport pipe. Heat treatment equipment, 俤) A coke oven is equipped with piping for discharging gas generated in the initial stage of dry distillation and piping for discharging high-temperature gas generated thereafter via a shutoff valve, and one end of the piping for discharging high-temperature gas is connected to the high-temperature gas injection pipe of the air flow transport pipe. A coke manufacturing apparatus, characterized in that the above (A) 03) is provided, a high temperature gas supply device continuous to the mouth. (2) The coke according to claim 1, wherein a carbon combustion device is attached to the high-temperature gas discharge pipe to burn and remove carcasses adhering to the inner walls of the high-temperature gas discharge pipe and the airflow transport pipe. Manufacturing equipment.