JPH0244871B2 - KOOKUSUKANSHIKISHOKASOCHINOSHOENDOHEISOKUKENSHUTSUHOHO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a large number of flues that communicate with an annular flue provided in the side wall of a pre-chamber of a coke dry cooling device and that open along the wall surface of the boundary between the pre-chamber and the cooling chamber. The present invention relates to a method for detecting blockage due to coke deposits in a small flue.

BACKGROUND TECHNOLOGY In general, a fire extinguishing furnace of a coke dry cooling system consists of a pre-chamber having a charging port at the top, a cooling chamber having a cooling gas blowing device at the bottom and a coke discharge device at the bottom. A circular flue is provided which communicates with a number of small flues opening along the wall surface of the boundary between the pre-chamber and the cooling chamber. The red hot coke charged from the top of the prechamber is cooled by inert gas blown from the bottom of the cooling chamber while descending, and the cooled coke is transferred to the furnace by a coke discharge device at the bottom of the cooling chamber. Expelled outside. On the other hand, the inert gas heated by heat exchange with the coke enters the circular flue through the small flue, enters the primary dust remover through the flue, and is then cleared of dust. The heated inert gas is cooled by heat exchange in the waste heat boiler, and the cooled inert gas is circulated and blown from the cooling gas blowing device by a blower through a secondary dust collector.

The lump coke level at the entrance of the small flue in the upper part of the cooling chamber is at the position shown in Figure 2 a during normal operation, but if the amount of inert gas passing through the small flue increases too much, It reaches the position shown in b, and if this state continues for a long time, a sudden blow-up occurs and rises to the position c, that is, the annular flue. In other words, the small flue is blocked and the flow of the cooling inert gas is disturbed, which not only causes uneven cooling of the red-hot coke, but also
Eventually, operations would be halted for an extended period of time.

In order to avoid such a situation, inspection ports are installed at the top of the circular flue and at the side of the small flue during construction, but inspections require the operation to be stopped and inspection is only possible when the flue is stopped. Not, but
Because it was an artificial method, it was inefficient and had safety issues, among other inconveniences.

For this reason, there is no need to stop operations compared to before.
In addition, as a method for detecting blockage of a small flue without using artificial means, for example, a pressure detector such as a manometer or an electric resistance pressure gauge can be installed in the upper part of the cooling chamber of the fire furnace and in the small flue to detect the differential pressure. A method of comparing the differential pressure value with a predetermined set value indicating the pressure drop limit of coke accumulation in a small flue (Japanese Patent Application Laid-Open No.
58-138780), and a capacitive type in the small flue of the cooling room.
A method of providing an arbitrary level meter such as an ultrasonic type, microwave, laser, etc. (Japanese Patent Laid-Open No. 59-53586) has been proposed.

However, the method of detecting by pressure difference has inaccurate detection accuracy because the differential pressure changes as the coke diameter, ambient temperature, and gas composition change, and the method of detecting by level meter has Both methods had drawbacks, such as the fact that they could not be detected until the occlusion had progressed to a certain extent.

Problems to be Solved This invention was made in view of the above-mentioned circumstances, and is based on the fact that the temperature of the circulating inert gas of a coke dry fire extinguishing system is continuously measured in a small flue of the circulation system, and the temperature of the circulating inert gas of a coke dry fire extinguishing system is continuously measured, and the change in the measured temperature is The object of the present invention is to provide a small flue blockage detection method that can detect a small flue blockage state due to coke accumulation and ensure stable operation of equipment.

Means for Solving the Problems This invention is one of a number of small flues that communicate with the annular flue in the side wall of the prechamber of a coke dry cooling system and open along the wall surface of the boundary between the prechamber and the cooling chamber. Insert a thermocouple in or all of the
The temperature of the circulating inert gas passing through the small flue is continuously measured by the thermocouple, the deviation of the measured temperature per unit time is determined, and the coke deposition situation in the small flue and the temperature deviation are calculated in advance. The gist of this paper is a method for detecting blockage of a small flue in a coke dry fire extinguishing system, which is characterized by detecting the blockage status of a small flue by comparing it with a set value obtained from the relationship.

Function The coke located at the entrance of the small flue of a coke dry extinguishing system is usually replaced by red-hot coke that descends from above when the coke descends due to the discharge of cooled coke from the bottom. For this reason, the temperature of the inert gas passing through the small flue varies greatly. However, if the amount of circulating inert gas increases for some reason and the coke level in the small flue rises, the exchange of coke at the small flue inlet becomes less and the variation in gas temperature becomes smaller. When the coke level rises to the thermocouple, the thermocouple comes into contact with the coke and detects the coke temperature, resulting in a nearly constant temperature.

Therefore, by inserting a thermocouple into the small flue and continuously measuring the temperature of the circulating inert gas passing through it, we find the deviation of the measured temperature per unit time, and also investigate coke deposition and temperature changes in the small flue. By comparing the value with a preset value based on the relationship with the deviation, it is possible to almost accurately detect the blockage status of the small flue.

Embodiment The present invention will be explained below based on drawings showing an example of implementation. FIG. 1 shows a coke dry extinguishing system in which the present invention is implemented, in which 1 is a pre-chamber, 2 is a cooling chamber, and 3 is a large number of small flues that open along the boundary wall between the pre-chamber 1 and the cooling chamber 2. ,
4 is a small flue 3 installed in the side wall of the pre-chamber 1
5 is an inert gas blowing device installed at the bottom of the cooling chamber 2, 6 is a flue connected to the circular flue 4, and 5 is a flue connected to the exhaust heat boiler 7 and the primary dust remover 8. connected via. A secondary dust collector 9 is connected to the waste heat boiler 7, and the secondary dust collector 9 is connected to the inert gas blowing device 5 via a circulation blower 10.

Therefore, while the red hot coke charged from the charging port 11 at the top of the pre-chamber 1 descends and descends in the cooling chamber 2, it is blown by the inert gas blown from the inert gas blowing device 5. cooled down,
The cooled coke is discharged out of the furnace by a discharge device 12 connected to the bottom of the cooling chamber 2. On the other hand, the inert gas heated by exchanging heat with the coke enters the circular flue 4 through the small flue 3, enters the primary dust remover 8 through the flue 6, and is removed from the duct. Thereafter, it is cooled by heat exchange in the waste heat boiler 7. The cooled inert gas is circulated and blown from the inert gas blowing device 5 by the circulation blower 10 through the secondary dust collector 9 .

In the inert gas circulation system, through the flange of the measurement port 20 provided in part or all of the small flue 3,
A thermocouple 21 is inserted from the outside and installed so as to protrude from the vertical part of the small flue 3, and the gas temperature continuously detected by the thermocouple 21 is inputted to a calculation device 22. The calculation device 22 calculates the deviation per unit time of the input gas temperature, and calculates each setting value obtained from the relationship between the coke deposition situation in the small flue 3 and the temperature deviation, which was input in advance from the setting device 23. Perform a comparison operation with
The coke blockage situation in the small flue 3 is displayed.

The set values input in advance from the setting device 23 to the calculation device 22 are based on the processing capacity of the fire extinguishing furnace, the structure of the small flue,
Although it cannot be specified as it depends on the amount of circulating gas, etc., for example, the minimum value of temperature deviation per unit time during normal operation is X, and if the coke level rises above the thermocouple in the small flue, The maximum temperature deviation per unit time is Y, and the intermediate value between X and Y is Z.
Set as .

Then, it is compared with the temperature deviation A obtained from the measured value of the thermocouple 21, and if A≧X, it is “normal”.
If ≦Y, “blockage” is displayed, if A=Z±α (α is a constant), “coke level rise” is displayed, and if A≦Y or A=Z±α,
At the same time as the alarm 24 is sounded, the damper 25 of the circulation blower 10 is automatically throttled or the number of rotations of the circulation blower 10 is controlled to be lowered to keep the amount of inert gas blown low.

With the above configuration, during normal operation, that is, when the level of lump coke at the entrance of the small flue 3 is low (a), the lump coke at the entrance of the small flue is replaced by the coke falling from above due to the discharge of the cooled coke. The temperature of the inert gas detected by the thermocouple 21 varies widely, the deviation per unit time is large, A≧X, and “normal” is displayed. However, in case b, where the lump coke level at the entrance of the small flue 3 rises for some reason and starts to block the small flue 3, the coke that has entered the small flue 3 will continue to flow from above even when the cooled coke is discharged. Since it is not sufficiently replaced with the descending coke, the variation in the temperature of the inert gas detected by the thermocouple 21 is reduced, and A
=Z±α, the arithmetic unit 22 displays “coke level rise”, sounds the alarm 20, and controls the damper 25 of the circulation blower 10 to reduce the amount of inert gas blown.
By discharging the cooled coke while the inert gas injection amount is being reduced, the coke level in the small flue 3 gradually decreases, and the variation in the inert gas temperature becomes large, resulting in a normal state (state a). ), increase the amount of inert gas blown again to restore the original state.

Therefore, it is possible to know in advance whether the small flue is clogged with coke, prevent coke from blowing up, and continuously perform stable operation.

Effects of the Invention This invention detects the blockage status of the small flue of a coke dry extinguishing system by continuously detecting the temperature of the inert gas passing through it using a thermocouple installed in the small flue, and calculating the deviation per unit time. By comparing with the set value set in advance, it is possible to grasp almost accurately.

Therefore, it is possible to prevent coke from blowing up into the small flue, allowing stable operation over a long period of time, and taking sufficient precautionary measures against abnormalities.

[Brief explanation of drawings]

The drawings show an example of the implementation of the present invention.
The figure is an overall explanatory view, and FIG. 2 is a sectional view of a main part. 1...Pre-chamber, 2...Cooling chamber, 3...
Small flue, 4... Circular flue, 5... Gas blowing device, 6... Flue, 7... Waste heat boiler, 8... Primary dust remover, 9... Secondary dust collector, 10... Circulation Blower, 20... Measuring port, 21... Thermocouple, 22...
Arithmetic device, 23... Setting device, 24... Hibikiho, 25
...damper.

Claims (1)

[Claims] 1 Thermocouples are inserted into some or all of the many small flues that communicate with the annular flue in the side wall of the pre-chamber of the coke dry cooling system and open along the wall surface at the boundary between the pre-chamber and the cooling chamber. The temperature of the circulating inert gas passing through the small flue is continuously measured using a thermocouple, and the deviation of the measured temperature per unit time is determined. A small flue blockage detection method for a coke dry fire extinguishing system, characterized by detecting a blockage state of a small flue by comparing it with a set value obtained from a relationship.