JPH0126395B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a new air flow control device for a coke dry cooling system, and in particular, it automatically detects the pressure drop limit of coke accumulation in the gas discharge hole of a cooling tower and reduces the blowing supply amount of cooling gas. The present invention relates to an air volume control device in a coke dry cooling system that can prevent gas circulation system accidents due to coke blowing up and maintain continuity of coke cooling.

In general, a coke dry cooling system has a cooling tower 3, which has a charging port 1 for red-hot coke at the top and a cutting port 2 for cooled coke at the bottom, as shown in FIG. A gas discharge hole 4 and an annular flue 5 communicating with each gas discharge hole are formed, and a cooling chamber 6 is formed below the gas discharge hole 4 to form a moving layer of red-hot coke. Further, a cooling gas inlet 7 is provided at the bottom of the cooling tower 3 and configured to blow cooling gas into the cooling tower 3. The red-hot coke charged into the cooling tower 3 from the charging port 1 is cooled by the cooling gas blown from the bottom and is cut out from the cutting port 2, while the cooling gas is heated by the moving bed of the red-hot coke. After the exchange, high-temperature gas flows out from the gas exhaust hole 4 into the annular flue 5 and reaches a waste heat boiler (not shown).

Incidentally, a phenomenon often occurs in which when the cooling gas reaches a high temperature and is sucked into the gas discharge hole 4, coke lumps are also carried away. Although this phenomenon cannot be avoided due to the structure, the coke lumps deposited in the gas exhaust hole 4 gradually grow over a long period of time and block the gas exhaust hole 4, and at a certain critical point, blowing up suddenly occurs. This blows up into the annular flue 5 or a flue connected to it, so it is necessary to prevent this blowing up in advance. This is because not only will the flow of cooling gas be disrupted, making it impossible to uniformly cool the coke, but if coke lumps enter the circulation system, the operation will have to be stopped for a long time.

Conventionally, in order to prevent this, pressure gauges 8 and 8 were installed separately to measure the pressure between the upper part of the cooling chamber 6 and the gas discharge hole 4, and workers read these values periodically and calculated the differential pressure. An increase in the predetermined pressure loss, that is, the differential pressure between the two, means that coke is blowing up, so if the differential pressure exceeds a predetermined limit,
The air volume of the circulation blower 9 is rapidly reduced so as to manually reduce the amount of cooling gas blown into the air. During this squeezing, by continuing to cut out the coke, the coke lumps accumulated in the gas discharge hole 4 are allowed to be discharged naturally, or they are forcibly discharged using a poking rod 10 provided on the outer wall. I tried to turn the airflow back on again.

However, the pressure at the top of the cooling chamber 6 and the gas discharge hole 4 fluctuates and changes from moment to moment, so even if you install a separate pressure gauge 8 and read it independently to calculate the differential pressure, Since it was not possible to read the pressure indication between the two, the accuracy was not sufficient to determine the increase or decrease in pressure drop between the two. For this reason, the situation of the gas discharge hole 4 could not be accurately grasped, and the amount of air blown had to be extremely controlled in anticipation of excessive safety, making it impossible to perform stable operations. In addition, due to manual control, workability was poor and accidents could not be completely prevented.

In view of the problems with conventional air volume control devices, the inventors of the present invention have devised the present invention in order to effectively solve the problems.

Therefore, the object of the present invention is to provide coke that can continuously cool coke, can take sufficient advance measures against process abnormalities, and can prevent accidents in the circulation system due to coke blowing up. The present invention provides an air volume control device for a dry cooling device.

The present invention is configured as follows to achieve the above object. That is, a pressure detector that continuously measures the pressure difference between the pressure at the upper part of the cooling chamber of the cooling tower and the pressure at the gas outlet is provided outside the cooling tower. A control circuit is provided, one input of which is the differential pressure obtained by the pressure detector. The other input of this control circuit is set to a predetermined pressure value which is the pressure drop limit of coke accumulation in the gas discharge hole, that is, the upper limit of the differential pressure value at which blow-up occurs. The control circuit compares this set value with the above-mentioned differential pressure, and if the differential pressure exceeds the set value, the control circuit controls the circulating blower to reduce the cooling gas blowing volume of the circulating blower that is blowing the cooling gas. It is configured to issue an alarm to inform the user of the situation and to take precautionary measures.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of an air volume control device in a coke dry cooling device according to the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, a pressure detection end 12 is provided at the upper part of the cooling chamber 6 formed at the lower part of the cooling tower 3 to detect the pressure in the upper part of the cooling chamber which penetrates the refractory 11 and is taken out to the outside. There is. Similarly,
A gas discharge hole 4 that collects the cooling gas a blown into the cooling tower 3 into an annular flue 5 provided at the top and discharges it.
A pressure detection end 13 is provided to detect the pressure of this gas discharge hole. Both pressure detection ends 12, 13
is the difference in pressure between the upper part of the cooling chamber 6 and the gas discharge hole 4,
That is, they are connected externally to form a pressure detector 14 to detect differential pressure. The pressure detector 14 that detects this differential pressure is, for example, a manometer whose one end is connected to the pressure detection end 12 communicating with the upper part of the cooling chamber and the other end is connected to the pressure detection end 13 which communicates with the gas discharge hole. The pressure difference measured from the difference may be taken out as an electric signal, or an electric resistance pressure gauge may be used, and preferably, a transmitter capable of wirelessly transmitting the obtained differential pressure value signal is provided. This is to ensure that the differential pressure value can be accurately received in an operation room (not shown) that is remote from the cooling tower 3.

A control circuit 15, a recorder 16, and an alarm 17 are provided in the operation room. The control circuit 15 is
The differential pressure value of the pressure detector 14 is input to one input A. In addition, at the other input B, coke lumps are deposited in the gas discharge hole 4,
The value of the differential pressure between the upper part of the cooling chamber and the gas exhaust hole 4 at the limit point at which the coke blow-up phenomenon occurs, that is, the pressure drop limit value at the gas exhaust hole 4 confirmed in advance through experiments, etc., is input and set. This setting value is set to a low value for safety. Then, the control circuit 15 continuously compares the differential pressure value with the set value, inputs the comparison output to the recorder 16 to record it as data, and detects when the differential pressure value exceeds the set value. At the same time as the alarm 17 sounds, the rotation speed of the motor 18 of the circulation blower 9 is controlled to be reduced, or the damper 19 provided at the air outlet of the circulation blower 9 is automatically throttled. It is designed to keep the volume low. This control amount is not an extreme value such as stopping the cooling gas, but may be an amount that can remove the coke lumps accumulated in the gas discharge hole. Reference numeral 20 denotes a poking rod for performing this removal, which is inserted into the gas discharge hole 4 from the outside, and is provided so as to be normally pulled out and manually operated.

The operation of the present invention having the above configuration will be described.

During normal operation of the coke cooling system, the rotational speed of the motor 18 of the circulation blower 9 is maintained at a constant or appropriate level, and cooling gas is blown into the cooling tower 3 to cool the red-hot coke and sequentially cut it out from the cutting port 2. At this time, the cooling gas a is sucked in from the gas exhaust hole 4 without any problem and exits from the annular flue 5, so the pressure difference between the upper part of the cooling chamber 6 and the gas exhaust hole detected by the pressure detector 14 is small. However, when the coke lumps carried along with the cooling gas a begin to block the gas discharge hole 4 and increase in amount, significantly impeding the flow of the cooling gas, the pressure detector 14 is activated by the control circuit 15. Outputs a differential pressure that exceeds the set value. As a result, the control circuit 15 immediately operates to sound the alarm 17 and notify the operator in the operation room, and also to control the rotation of the motor 18 or the damper 1.
9 is controlled to reduce the amount of cooling gas blown.
While this cooling gas injection amount is decreasing, that is, during the second
As shown in the figure, by continuing to cut out the cooled coke from the point where the differential pressure value ΔP reaches the set value, the coke level is lowered and the gas exhaust hole 4 emerges from the coke fluidized bed. Either wait until the accumulated coke lumps slide down under their own weight, or forcefully discharge them using the poking rod 20. After cleaning the gas discharge hole 4 and canceling the alarm, the cooling gas blowing volume is increased again to return to normal. This return can be done by manual reset or by cleaning the pressure sensor 14.
Since the detected differential pressure naturally decreases, automatic recovery is also possible, and either can be selected. Note that the comparative output data recorded on the recorder 16 during this time will be valuable data in determining how the pressure drop limit in the gas discharge hole 4 is reached.

Therefore, it is possible to prevent coke blowing up in advance, and this prevention can be done without stopping the operation.It only requires a slight temporary decrease in the amount of cooling gas, and stable operation can be carried out continuously. be able to.

Note that it is also possible to provide a plurality of pressure detectors and detect the maximum pressure among them. Further, in the above embodiment, the poking rod 20 is manually operated.
As shown in FIG. 1, the output of the control circuit 15 may be fed back to drive the piston 21 provided to interlock the poking rod 20, thereby automatically operating the poking rod 20. In this case, the control circuit 15 forms a negative feedback circuit and always works to automatically lower the differential pressure between the upper part of the cooling chamber 3 and the gas discharge hole 4, so that it is possible to omit any manual work. Become.

In short, the present invention provides the following excellent effects.

(1) Accidents in the circulation system caused by blowing up coke deposited in the gas exhaust hole can be prevented.

(2) Coke cooling operation can be performed continuously without interruption.

(3) Sufficient proactive measures can be taken against process abnormalities.

[Brief explanation of drawings]

FIG. 1 is a system sectional view illustrating the prior art and a preferred embodiment of the air volume control device according to the present invention, and FIG. 2 is a system sectional view illustrating the air volume control of the air volume control device according to the present invention. It is a curve diagram. In the figure, 1 is a red hot coke charging port, 2 is a cutting port,
3 is a cooling tower, 4 is a gas discharge hole, 5 is an annular flue,
6 is a cooling chamber, 9 is a circulation blower, 14 is a pressure detector, 15 is a control circuit, and 17 is an alarm.

Claims (1)

[Claims] 1. A red-hot coke moving bed is formed in a cooling tower that has a red-hot coke charging port at the top and a cutting port at the bottom, and cooling gas is blown from the bottom by a circulation blower to form a red-hot coke moving bed in a cooling chamber located at the bottom. In a coke cooling system that exchanges heat with the gas and discharges it as high-temperature gas from a circumferentially formed gas exhaust hole at the top to an annular flue, the difference between the pressure at the top of the cooling chamber and the pressure inside the gas exhaust hole. A pressure detector detects the pressure, and the differential pressure value detected by the pressure detector is compared with a predetermined setting value indicating the pressure drop limit of coke accumulation in the gas discharge hole, and the value exceeding this setting value is determined. An air volume control device for a coke dry cooling system, comprising a control circuit that reduces the air volume of cooling gas blown by the circulation blower and issues an alarm when a pressure difference is detected.