JPH0441586A - Increase and control of heat recovery in coke dry quenching facility - Google Patents

Abstract

PURPOSE:To keep the amt. of steam generation of a coke dry quenching facility at the highest level within a set range by controlling the pressure in a prechamber. CONSTITUTION:When recovered heat capacity is increased by burning flammable gas in a cycling gas 7 in a coke dry quenching facility, the amt. of flammable gas formation based on the intaken gas (through a pumping pipe 17) into a prechamber 3 or the amt. of discharge of the flammable gas (through the pumping pipe 17) from the prechamber 3 is controlled and adjusted by controlling 12 the pressure 10 in the prechamber 3 within a specified range based on the analytical values of the cycling gas ingredients (measured with an ingredient measuring instrument 14).

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for controlling the increase in the amount of recovered heat in coke dry extinguishing equipment, specifically, to maintain the amount of steam generated at the highest level within a set range. This invention relates to a method for generating or controlling the release of combustible gas.

[Prior art] - Automatic control methods for combustible gas inevitably generated from charged red-hot coke in coke dry fire extinguishing equipment include combustion of combustible gas by introducing air, dilution by blowing nitrogen, and dissipation of circulating gas. Methods are known (JP-A-53-5201, JP-A-54-10302, JP-A-58-1591).

Automatic control of these combustible gas components prevents explosions within the system.
This is a control method based on reducing combustible gas components with the aim of reducing the amount of expensive nitrogen gas used.

In addition, as a method of obtaining flammable gas from red-hot coke,
A device for blowing air and water into a part of a chamber/tube is disclosed (Japanese Unexamined Patent Publication No. 52-85203, Japanese Patent Publication No. 1-283).
No. 98).

However, the above method requires new equipment to be installed in the existing coke dry extinguishing equipment.

Problems to be Solved by the Invention The present invention enables circulation while maintaining the amount of steam generated in coke dry extinguishing equipment at the highest level within a set range, without installing new equipment, by controlling the pressure inside the prechamber. The aim is to maintain the combustible gas concentration in the gas within a certain range.

However, the amount of red-hot coke deposited in the prechamber changes from moment to moment. Red-hot coke produced in a coke oven is charged into the prechamber in packets, resulting in patch charging. On the other hand, the dry extinguished coke is continuously discharged from the coke dry extinguishing equipment. A pre-chamber is provided as a means of matching batch operation and continuous operation, but the amount of red-hot coke deposited in the pre-chamber decreases from one charge to the next charge. .

The present invention attempts to control the production of combustible gas in an amount corresponding to the increased amount of recovered heat in the prechamber where the amount of red-hot coke deposited varies.

Means for Solving the Problems The present invention aims to increase the amount of recovered heat by burning combustible gas in circulating gas in coke dry extinguishing equipment, by controlling the internal pressure of the bleed chamber within a predetermined range based on the circulating gas component analysis value. 1. A method for controlling an increase in the amount of recovered heat in coke dry extinguishing equipment, characterized in that the amount of combustible gas produced by air taken into a prechamber or the amount of combustible gas released from a prechamber is adjusted by controlling .

Working Coke dry extinguishing equipment can extinguish the red hot coke discharged from the coke oven without generating dust, and also effectively converts the sensible heat held by the red hot coke into steam energy in the waste heat boiler via circulating gas. can be used.

In order to ensure stable operation of this waste heat boiler, it is desirable to control the content of combustible gas (H2, CO) components in the circulating gas to 0.5 to 15 mmO1%, preferably 1 mmO1% or less. ing.

The inventors have found in their experience in operating coke dry extinguishing equipment that when the prechamber internal pressure increases, the combustible gas concentration tends to decrease, and conversely, when the prechamber internal pressure decreases, the combustible gas concentration tends to increase. Based on the knowledge that
Combustible gas is generated within the pre-chamber or excess combustible gas is released from the pre-chamber by actively adjusting the internal pressure within the range of -50 to +201 mm, for example. This makes it possible to secure an amount of combustible gas corresponding to the increase in the amount of recovered heat.

The prechamber internal pressure can be maintained within a predetermined range by adjusting the amount of circulating gas released.

For example, when the combustible gas concentration is higher than the target value, the amount of released circulating gas is reduced to make the pre-chamber internal pressure positive, and the combustible gas is released from the intake and exhaust pipes provided in the pre-chamber. On the other hand, if the combustible gas concentration is lower than the target value, the amount of dissipation of circulating gas is increased to make the pressure inside the prechamber negative, and air is introduced from the intake and exhaust pipe provided in the prechamber.
Combustible gas is produced by reaction with red-hot coke in the prechamber.

The prechamber internal pressure control range may vary depending on the furnace characteristics, but may be in the range of -50 to +20+smAq, for example. As mentioned above, the amount of red-hot coke deposited in the prechamber varies.1. The amount of combustible gas that can be generated with the introduced air depends on the amount of red-hot coke, so the amount of combustible gas that is generated varies. When air is introduced, if the amount of red-hot coke deposited is small, there will not be enough contact time to contribute to the generation of combustible gas, so some of it will pass through the lower end of the prechamber (upper end of the chamber). Excludes as excess air into the circulating gas.

This phenomenon is accompanied by abnormal combustion within the circulation duct and damages the boiler tube, which is heat recovery equipment.

Therefore, the present invention controls the content of combustible gas components to 0.5 to 15% of combustible gas, preferably 1% or less, based on the analysis value of the circulating gas components, and monitors the oxygen concentration. This is to correct and control the prechamber internal pressure by adjusting the amount of radiation.

The components of the circulating gas may be measured between the outlet side of the heat recovery boiler and the inlet side of the chamber.

The present invention will be specifically explained below with reference to the drawings.

As shown in Fig. 1, the coke dry extinguishing equipment includes a prechamber 3 having a charging port 2 at the top of the cooling tower structure, a cooling chamber 4 in the middle, and a circulating gas inlet 5 and extinguishing coke cutout at the bottom. Equipped with a device 6, circulating gas 7 is discharged from a part arranged annularly at the upper end of the cooling chamber 4 and introduced into a waste heat boiler 8, and the heat retained in the red-hot coke is recovered as steam 9 via the circulating gas 7. . ! 3 is a temperature detector for the circulating gas 7 introduced into the waste heat boiler 8;

Since the recovered steam 9 is used industrially as a heat source in a factory, for power generation, etc., it is desirable to maintain the amount of steam generation at the highest level within a set range. To this end, in response to heat fluctuations that occur due to various causes during the operation of coke dry fire extinguishing equipment, combustible gas corresponding to the increased amount of recovered heat is pumped into the prechamber.
It is generated in a timely manner within 3 days.

Specifically, a suction and exhaust pipe 17 is provided in the upper part of the pre-chamber 3. Based on the measured value of the pressure measuring device 10 of the pre-chamber 3 and the target pressure value set from the automatic operation control computer 12, the pressure regulator 11 controls the opening degree of the valve 13 provided in the circulating gas diffusion pipe 18. .

The automatic operation control computer 12 contains the combustible gas concentration 15 measured by the circulating gas 7 component measuring device 14 and the introduced air amount 1.
6 is input and the measured combustible gas concentration is higher than the set concentration, the pressure inside the pre-chamber 3 is increased to reduce the amount of air sucked through the suction and exhaust pipe 17 provided in the pre-chamber 3, or the pre-chamber 3 The internal pressure is made higher than the positive pressure and combustible gas is released from the intake and exhaust pipe 17. Conversely, if the measured combustible gas concentration is lower than the set concentration, the pre-chamber 3
Suction and exhaust pipe 1 installed in prechamber 3 to reduce internal pressure
Reduce the combustible gas emitted from 7 or make the internal pressure of the brake chamber 3 a negative pressure, and suck the atmosphere through the suction and exhaust pipe 17.
Generates combustible gas of O1 and 2.

Under the condition where air is sucked into the above-mentioned breech chamber 3 and combustible gas is generated, the automatic operation control computer 12 determines whether or not combustible gas can be generated based on the oxygen concentration measured by the circulating gas 7 component measuring device 14. conduct.

When the oxygen concentration increases to the set value, the prechamber 3
Instruct to change the internal pressure set value by a certain amount, for example, about 1 (lsmAp), and set the pre-chamber 3 internal pressure control value so that the intake air amount corresponds to the amount of red-hot coke deposited in the pre-chamber 3. do.

Example In the coke dry extinguishing equipment shown in FIG. 1, the amount of extinguishing coke cut out was reduced by 75% in order to cope with the time required to resolve troubles that occurred in the red-hot coke transfer route.

Figure 2 shows the control image at that time.As a result, the temperature of the circulating gas 7 will decrease, but a part of the circulating gas 7, 150008 m3/H, will be dissipated, and as shown in Figure 2 (b). As shown, the pressure inside the brake chamber 3 is 120m
The mAq is lowered, and the atmosphere is sucked through the suction and exhaust pipe 17.
0ONm3/H combustible gas was generated, and as shown in FIG. 2(c), a decrease in the amount of heat recovered in the waste heat boiler 8 was suppressed. After the problem is resolved (about 10 minutes), the amount of extinguishing coke cut out is returned to the normal value, and the pressure inside the breech chamber gradually increases until it reaches -1, which is almost the same as before the problem.
0 fat mAq.

FIG. 2(d) is an example of a change in the boiler log gas temperature in a case (comparative example) in which the operation was performed without controlling the internal pressure of the boiler chamber 3 in the same operation as described above.

Effects of the Invention As described above, the present invention generates combustible gas at any time during the process of coke dry fire extinguishing equipment, and can control the bolts, so it can operate near the upper limit of the set temperature of the waste heat boiler, and the amount of gas generated can be reduced. The economic effect is large because the operation is achieved at the highest level within the set range.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an example of an embodiment device of the present invention. FIG. 2 is a graph showing the operational trends of the control method of the present invention and the comparative example. DESCRIPTION OF SYMBOLS 1...Cooling tower, 2.Charging port, 3.Brenchamper, 4.Skewer cooling chamber/he 5..Circulating gas inlet, 6..Cutting device, 7.. Circulating gas, 8... Company waste heat boiler 9... Steam, 10...
Pressure measuring device, 11... Pressure regulator, 12... Automatic operation control computer, 13... Diffusion valve, 14... Component sound meter, 15 Φ meeting φ combustible gas concentration value, 16... air volume,
No. 17: Suction and exhaust pipe, No. 18: Diffusion gas, No. 19: Temperature measuring device.

Claims (1)

[Claims] When increasing the amount of recovered heat by burning combustible gas in the circulating gas in coke dry extinguishing equipment, the intake air to the prechamber is A method for controlling an increase in the amount of recovered heat in a coke dry fire extinguishing equipment, the method comprising adjusting the amount of combustible gas produced by or the amount of combustible gas released from a pre-chamber.