JPS5896677A - Method for controlling temperature of hot exhaust gas of dry coke-quenching apparatus - Google Patents

Abstract

PURPOSE:To control the temperature of hot exhaust gas of a dry coke-quenching apparatus at a constant level, by separating coke dust from red-hot coke, introducing the dust in a reservoir and burning with air blown into the reservoir, and introducing the combustion gas to the hot exhaust gas line of the quenching tower. CONSTITUTION:Coke dust in the red-hot coke to be charged in a quenching tower is sieved and separated with the sieve 9, introduced into the reservoir 10, and burnt with air introduced into the reservoir 10 through the air inlet 13. The produced combustion gas is introduced into the hot exhaust gas line 5 of the quenching tower at a controlled rate according to the temperature of the hot exhaust gas. EFFECT:As harmful coke dust is separated, the amount of fine coke dust in hot exhaust gas can be reduced, the abrasion of the circulation blower, etc. can be prevented, and the size of the dust-collector, etc. can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling the exhaust gas temperature of a coke dry extinguishing system.

Traditionally, red-hot coke discharged from a coke oven is led to a fire extinguishing tower and cooled by spraying cooling water. In recent years, red-hot coke has been charged into a cooling tower for the purpose of environmental protection or energy saving, and cooling gas is blown into the bottom of the cooling tower to cool it down, while exhaust gas heated from the red-hot coke is led to a boiler for heat exchange. A so-called coke dry fire extinguishing system that recovers heat by generating steam has been developed.

However, the amount of steam generated in this coke dry extinguishing system is directly affected by the amount of red-hot coke being cooled. For example, if the amount of red-hot coke discharged from a coke oven and charged into a cooling tower is temporarily reduced due to Sakuto's circumstances, the temperature of the exhaust gas from the cooling tower may not rise enough to reach the boiler. As a result, the amount of steam produced by the boiler decreases.

There is a reason that it is difficult to control the amount of steam generated in a fixed manner. □ In addition, the red-hot coke charged into the cooling tower contains about 50% of coke powder of 1-diameter size or less, and in the case of blast furnace coke, etc., such coke powder is divided into lump coke of a certain particle size or more. It is used after removal because it is required. In particular, the fine powder contained in red-hot coke is collected by installing a dust collector in front of the boiler because it accompanies the exhaust heat gas discharged from the cooling tower and wears out equipment such as the exhaust heat boiler or circulation blower in the circulation system. However, the equipment costs, operation and maintenance costs, and coke powder recovery costs are necessary, which is a negative factor in the economical evaluation of 69° coke dry fire extinguishing equipment.

The present invention aims to eliminate the above-mentioned drawbacks, and provides a control method for stabilizing the temperature of exhaust gas discharged from a cooling tower and reducing dust content in a coke dry fire extinguishing system. The method separates the coke breeze from the red-hot coke charged into the cooling tower and stores it.
The system is characterized in that air is blown into the reservoir to combust the coke breeze, and the combustion gas is blown into the exhaust heat gas of the cooling tower to control the gas temperature.

The present invention will be described below with reference to FIG. FIG. 1 is a diagram showing an embodiment of the invention. (1) is a cooling tower, (2) is a distribution chamber that distributes the red hot coke discharged from the coke oven, (3) is a cooling gas distributor that blows cooling gas, (4) is a discharger, ( &) is the exhaust gas pipe, (6
) is the collection IIIA loss, and (7) is the waste heat boiler. Cooling gas is blown into the red-hot coke charged in the cooling tower (1) from the distributor (3) to cool it. The cooled coke is discharged by a discharge device (4). On the other hand, the cooling gas is heated by red-hot coke and becomes waste heat gas 9, waste heat gas pipe (5)
The hot exhaust gas is guided to the exhaust heat boiler (7) and cooled by generating steam through heat exchange, and is again circulated and blown into the cooling tower as cooling gas by the circulation blower (8). In such a coke dry fire extinguishing system, the present invention has the following features:

The sieve is used to separate the coke powder contained in the charged red hot coke and introduce it into the storage tank. The separated red-hot coke powder is led to a storage tank αQ. αυ is an on-off valve. Combustion air is blown into the storage tank. (
2) is an air blower, and as is an air inlet. The red hot coke powder is combusted by the injected static electricity, becomes high-temperature combustion gas, and is blown into the exhaust heat gas pipe (51) of the cooling tower through the connecting pipe α◆. However, when the temperature of the exhaust gas decreases, the amount of blowing is increased, and when the temperature of the exhaust gas rises, the amount of blowing is reduced or stopped. (2) is a temperature sensor that detects the humidity of the exhaust gas using a 1m degree needle (to).The sensor is a controller.

m is a sea bream valve. The temperature of the exhaust gas is controlled to keep the temperature of the exhaust gas constant by controlling the amount of combustion air blown into the storage tank.

The embodiment will be explained using φ. The control method of the present invention was applied to a coke dry extinguishing system which cooled red-hot coke at a temperature of 1000-C to a temperature of 200'C and had a firing force of 130T/11.

FIG. 2 is a diagram showing the progress of the amount of red hot coke added and the exhaust gas temperature before and after implementing the temperature control method of the present invention.

The horizontal axis shows elapsed days, and the vertical axis shows the amount of red hot coke charged and the exhaust gas temperature. In FIG. 2, section a is the section where the conventional method has not been implemented, and section 9.6 is the section where the method has been used. In section a, the amount of red hot coke charged is reduced due to the operation of the coke oven at 1 kPI-66 or an unexpected accident of the coke extruder, belt conveyor, etc. 5 in the diagram
On the second day, the capacity (T/H) decreased to 100T/H.

The exhaust gas temperature decreased to 770''C in response to the decrease in the charging amount.

On the other hand, in section b, which is the section in which this invention is implemented, the amount of red hot coke charged is 75 T/H on the 155th day, and 1 liter on the 211th day.
Although the F was low at 00 T/H, the exhaust gas temperature was 800°C.
It was held evenly.

As described above, the temperature control method of this invention separates and burns the harmful coke powder contained in the red-hot coke, and uses the combustion gas to reduce the amount of waste heat gas discharged from the coke dry extinguishing system. The temperature is controlled uniformly, and the amount of steam generated by heat exchange with this exhaust gas is also uniform.
Its fields of use will also be expanded.

In addition, since the harmful coke powder contained in the red-hot coke is separated, the amount of fine coke accompanying the exhaust gas is reduced, reducing wear on the circulation follower, etc., and reducing the size of the equipment. It is effective.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing the progress of the red hot coke charge amount and exhaust gas temperature before and after implementing the control method of the present invention. In the figure, 1... Cooling tower, 2... Distribution room, 3... Cooling gas distributor, 4... Discharge machine, 5... Exhaust heat gas pipe, 6
... dust collector, 7 ... exhaust heat boiler, 8 ... circulation blower, 9 ... hook, lO ... storage tank, 11 ... on-off valve, 12 ... air blower, 13 ...・Air inlet, 14... Connecting pipe, 15... Temperature detector, 1
6...Temperature needle, 17...Controller, 18...Adjustment pulp. Source: Sumitomo Metal Industries, Ltd. Figure 1 Figure 2 +234567891012 ) 416 former 2022 term
Judgment (Japanese)

Claims (1)

[Claims] A coke drying system in which red-hot coke is charged into a cooling tower, and cooling gas is blown in from the bottom of the cooling tower to cool the red-hot coke, while heated exhaust gas is led to a boiler and heat is recovered as steam through heat exchange. In the fire extinguishing system, coke breeze from the red-hot coke is separated and guided to a storage tank, static electricity is blown into the storage tank to combust the coke breeze, and this combustion gas is blown into the exhaust heat gas of the cooling tower. A method for controlling exhaust gas temperature in a coke dry extinguishing system, which comprises controlling the gas temperature.