JPS6089619A - Diffusion gas combustion method in coke dry type fire extinguishing apparatus - Google Patents

Abstract

PURPOSE:To save fuel for assistant combustion and to sharply decrease a running cost of an apparatus, by a method wherein an amount of diffused gas conveyed within a diffusion gas pipe is detected, and based on such detecting value, an amount of supplied fuel for assistant combustion added to diffusion gas is calculated, and based on such calculating value, an amount of fuel for assist combustion is controlled. CONSTITUTION:An opening signal 14 from an upper diffusion value control part 13 enters a control part 12 for burner combustion for assist combustion, and by means of the opening of a valve and the pressure value of an upper diffusion gas inputted from a pressure guage 18, an amount of gas diffused is found. Based on such found value, an amount of fuel for assist combustion is calculated so that the temperature of combustion gas is increased to a value or some range, and based on the result, an opening signal 20 for a regulating valve 9 in a fuel feed pipe 10 is transmitted to set the optimum opening of a valve. This determines fuel for assist combustion, for example, a flow rate of coke furnace gas, and optimum combustion is effected by an assist combustion burner 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for burning diffused gas in coke dry fire extinguishing equipment, and in particular, simultaneously ignites or extinguishes an auxiliary combustion bar size at the same time as the emission of diffused gas starts or stops; This invention relates to a diffused gas combustion method in which the supply amount of auxiliary combustion fuel is automatically controlled depending on the size of the diffused gas chamber, whereby the amount of auxiliary combustion fuel can be saved and the running cost of equipment can be significantly reduced.

Generally, coke dry extinguishing equipment is known as equipment for cooling red-hot coke, but the circulating gas circulating within this equipment contains Co, coke powder, etc. When emitting it into the atmosphere as a dissipated gas, it is burned to prevent pollution. At this time, the temperature of the emitted gas is raised using an auxiliary combustion burner or the like in order to make the combustion more effective.

Normally, the amount of circulating gas released into the atmosphere increases or decreases depending on the operating status of the equipment, so the amount of auxiliary combustion fuel required to raise the temperature of the released gas to a certain level also depends on the amount of combustion gas released into the atmosphere. Adjustments should be made depending on the size, but currently a large amount of auxiliary fuel is constantly being burned to accommodate the maximum amount of gas released, which inevitably increases the running cost of the equipment. .

The above is a case in which the gas is continuously diffused, but depending on the operating conditions or when the diffused gas is recovered for another utilization system, the gas is diffused into the atmosphere intermittently. If there is no gas dissipation, there is no need to burn the auxiliary burner, so it is possible to manually extinguish the auxiliary burner at this time, but this is cumbersome, and the gas can be turned off without burning the auxiliary burner. It may also cause operational errors such as dissipating water into the atmosphere. Therefore, even when gas diffusion is performed intermittently, the auxiliary combustion fuel must be constantly combusted as described above, necessitating the consumption of a large amount of fuel.

In addition, the diffused gas includes upper diffused gas discharged from the upper part of the cooling tower and lower diffused gas discharged from the lower part of the gas circulation system, but even if the total amount of these diffused gases is small, it is necessary to burn a large amount of auxiliary fuel. The flame temperature rose too high and the heat load on the combustion tube increased, which had a negative impact on the combustion tube and the refractory lining.

The present invention has focused on the above-mentioned problems and has been devised to effectively solve the problems.

SUMMARY OF THE INVENTION An object of the present invention is to provide a diffused gas combustion method that can save fuel for auxiliary combustion and significantly reduce running costs of equipment.

The present invention detects the amount of diffused gas transferred in the diffused gas pipe when burning the diffused gas, calculates the supply amount of auxiliary combustion fuel to be added to the diffused gas based on this detected value, and calculates the amount of fuel to be supplied for auxiliary combustion to be added to the diffused gas, and this calculated value The above objective is achieved by automatically controlling the amount of fuel supplied depending on the amount of emitted gas by increasing or decreasing the amount of fuel for auxiliary combustion based on the amount.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic plan view showing a diffused gas combustion apparatus for explaining the method of the present invention.

First, to explain the combustion apparatus for carrying out the method of the present invention, as shown in the figure, reference numeral 1 denotes an upper dissipation gas pipe that transfers flammable dissipation gas discharged from the upper part of a cooling tower (not shown); In the middle of the diffused gas pipe 1, a lower diffused gas pipe 2 for transferring flammable diffused gas released from the lower side of a gas circulation system (not shown) is connected and merged. Although the above describes the case of an IC in which the upper and lower diffusion gas pipes are connected, it is of course applicable to the case where these are separated.

The upper dispersion gas pipe 1 is provided with an upper dispersion valve 3 that controls the flow rate by changing the valve opening, and the lower dispersion gas pipe 2 includes a lower dispersion valve that controls the flow rate by changing the valve opening. 4 and a gas diffusion pipe switching valve 5 are respectively provided in sequence along the flow direction of the diffusion gas flow. A gas recovery pipe 6 is branched from the lower diffused gas pipe 2 between the lower diffused valve 4 and the switching valve 5, so that part or all of the diffused gas can be transferred to other systems for use. It looks like this.

A large-diameter combustion tube 7 is provided at the tip of the upper diffusion gas pipe 1, and an auxiliary burner 8 is attached to the combustion tube 7 with its tip extending into the tube. This auxiliary combustion burner 8 has a fuel supply pipe 1 with a control valve 9 interposed therebetween.
0 is connected, and an auxiliary burner ignition means 11 such as an igniter is attached.

The auxiliary burner ignition means 11 and the control valve 9 are controlled by the auxiliary burner combustion control section 12 to ignite or extinguish the auxiliary burner 8 or to increase or decrease the amount of fuel supplied. The signals or detected pressure values described below are input to the auxiliary burner combustion control section 12, and the control described above is performed based on the information. First, the signals include an opening signal 14 issued from the upper relief valve control unit 13 to adjust the opening degree of the upper relief valve 3, and an opening signal 14 issued from the upper relief valve control section 13 to adjust the opening degree of the upper relief valve 3.
An opening signal @ 16 issued from the lower diffusion valve control section 15 and an open signal 17 indicating the open/closed state of the gas diffusion pipe switching valve 15 are respectively inputted to adjust the opening of the valve, and the detected pressure horn value is , a first pressure gauge 18 provided in the upper diffused gas pipe 1 and a second pressure gauge 1 provided in the lower diffused gas pipe 2.
The pressure values obtained from each of 9 will be input.

Then, the auxiliary burner combustion control section 12 calculates the flow rate of the diffused gas flowing in the diffused gas pipes 1 and 2 based on the input opening/closing signal (opening degree signal) and the detected pressure value, and adjusts the flow rate to the determined value. Based on this, the amount of auxiliary fuel to be supplied is calculated, and based on this calculated value, the opening signal 20 of the control valve 9 is issued to increase or decrease the amount of auxiliary fuel to be supplied. Note that the first pressure gauge 18, the second pressure gauge 19, and their signals are used to more accurately know the flow rate of the diffused gas, and are not necessarily necessary.

Next, the method of the present invention will be specifically explained based on the combustion apparatus configured as described above.

The amount of lower diffused gas released from the gas circulation system is determined by the lower diffused valve 4.
The amount of upper diffusion gas released is determined by the valve opening of the upper diffusion valve 3. More precisely, since the downstream sides of both the upper and lower relief valves 3 and 4 are open to the atmosphere, the pressure on the upstream side of the joint venture also has an effect. Then, the valve opening degrees of these upper relief valves 3 and lower relief valves 4 (
1) are the opening signals 14° and 16 emitted from the upper radiation valve control section 13 and the lower radiation control valve 15, respectively.
The opening degree of each valve (including full opening) is determined automatically or manually depending on the operating status of the fire extinguishing equipment.

First, a case where gas recovery is performed will be explained.

The gas diffusion pipe switching valve 5 is in a fully open state, and this signal 17
is input to the burner combustion control section 12 for auxiliary combustion. The lower relief valve control unit 15 issues an opening signal for the lower relief valve 4,
When the lower relief valve 4 is opened, the opening signal is also input to the burner combustion control section 12 for auxiliary combustion. Therefore,
All of the lower diffused gas that has flowed through the lower diffused gas pipe 2 flows into the gas recovery pipe 6 and is recovered.

In such a state, the amount of gas released to the atmosphere is determined by the opening degree of the upper release valve 13. In addition, the opening signal 14 from the upper relief valve control section 13 is also input to the auxiliary burner combustion control section 12, and this valve opening and the first pressure gauge 18
The amount of diffused gas is calculated based on the pressure value of the upper diffused gas input from
Calculate the required amount) and burn it based on this! 13 [Supply pipe 1
The opening signal 20 of the control valve 9 of 0 is issued to set the optimum valve opening. Thereby, the flow rate of the auxiliary combustion fuel (for example, coke oven gas) is determined, and the auxiliary burner 8 performs optimal combustion.

Incidentally, when the control valve 9 is changed from fully open to the same state, the auxiliary burner ignition means 11 is automatically activated to ignite the auxiliary burner 8, causing spark discharge and the like.

Next, a case where gas recovery is not performed will be explained.

In this case, the gas diffusion pipe switching valve 5 is in the full state,
The signal 17 does not indicate this open state, and the auxiliary burner combustion control unit 1
2. In this state, the upper dissipation gas valve 3
When both the upper and lower diffused gas valves 4 are fully open, the amount of gas diffused into the atmosphere is zero, so the control valve 9 of the fuel supply pipe 10 is fully open. And in other cases, the upper dissipation valve 3
The sum total of the amount of gas passing through each of the lower and lower diffusion valves 4 becomes the amount of gas released into the atmosphere and is combusted in the combustion tube 7.

That is, the opening degree signal 14 of the upper diffusion valve from the upper diffusion gas section 13. Opening signal 16 of lower radiation control valve 15. Pressure value signal 21 from first pressure gauge 18 and second pressure gauge 19
The pressure value signals 22 from the auxiliary combustion burner combustion control section 12 are respectively inputted to the auxiliary burner combustion control section 12.

Then, the amounts of gas to be released in the upper and lower parts are determined based on the above-mentioned input values of the IC given to the control unit 12, and based on these values and their distribution (each gas component and gas temperature are different). ) Calculate the supply amount (necessary amount) of the auxiliary combustion fuel so that the combustion gas temperature reaches a certain III (or a certain range 111I) as shown in E, and adjust the combustion auxiliary fuel supply pipe 10 based on this calculated value. Opening signal 20 of valve 9
is emitted and an appropriate opening degree is set. This determines the flow rate of the auxiliary combustion fuel, and the auxiliary burner 8 performs optimal combustion.

Furthermore, depending on the opening degree of the lower diffusion valve 3 or the lower diffusion valve 4, the auxiliary burner ignition means 11 is automatically activated to ignite the auxiliary burner 8 when the amount of gas released to the atmosphere starts to flow from zero. Of course, when the total amount of released gas becomes zero, the control valve 9 is fully closed and fuel stops flowing.

In addition, as a modification, a thermometer 23 is installed in the combustion tube 7 to detect the combustion gas temperature, and the opening degree of the control valve 9 is adjusted so that this temperature is constant (or within a certain range). It may be controlled as follows.

Furthermore, in the above embodiment, the case where the upper diffused gas and the lower diffused gas are combusted in the same combustion tube has been described, but the case where the upper diffused gas and the lower diffused gas are combusted in separate combustion tubes is also explained. Of course, it can be applied.

Furthermore, a gas flow rate detection device such as an orifice may be provided in the diffused gas pipe to measure the amount of diffused gas. In this way, the amount of diffused gas is calculated from the valve opening degree of the diffused valve and the valve inlet pressure of the diffused gas, and based on this value, the supply amount of auxiliary combustion fuel to be added to the diffused gas is calculated, and this calculated value is Based on this, the valve opening degree of the control valve 9 of the combustion supply pipe 10 is adjusted to increase or decrease the amount of fuel, so that optimal combustion can be performed at all times.

In summary, the method of the present invention exhibits the following excellent effects.

(1) The amount of auxiliary fuel supplied can be increased or decreased according to the amount of emitted gas to achieve optimal combustion, so unlike the conventional case where a large amount of fuel is always consumed, the amount of fuel consumed can be significantly reduced. This can significantly reduce equipment running costs.

(2) As described above, since optimum combustion can be performed depending on the amount of emitted gas, combustible substances such as coke powder can be completely combusted, and therefore, pollution can be prevented.

(3) Since optimal combustion of the dissipated gas can be ensured, the combustion temperature can be maintained at a certain value (or within a certain range). Therefore, the combustion temperature does not exceed the design temperature of the combustion tube, and No adverse thermal effects. Also,
The stage temperature of the combustion tube itself does not need to be as high as in the conventional case, and an appropriate temperature can be selected, making it possible to design the combustion tube more economically.

(4) In addition, since the supply of auxiliary fuel is stopped when the gas is not released into the atmosphere, combined with the reason in item (1) above, it is possible to save more fuel, lower the running cost of the equipment, and save money. It can contribute to energy.

(5) Since the ignition of the auxiliary combustion burner is linked to the opening and closing operations of the diffusion valve or gas diffusion pipe switching valve, it is possible to significantly save labor, unlike the conventional case where it was done manually.
Furthermore, human errors such as forgetting to turn on the auxiliary burner can be prevented.

[Brief explanation of the drawing]

11 is a schematic plan view showing a diffused gas combustion apparatus for explaining the method of the present invention; FIG. In the figure, 1 is the upper diffusion gas pipe, 2 is the lower diffusion gas pipe, and 3 is the upper diffusion gas pipe.
4 is an upper diffusion valve, 4 is a lower diffusion valve, 5 is a gas diffusion pipe switching valve, 7 is a combustion cylinder, 8 is an auxiliary combustion burner, 9 is a control valve, 10 is a fuel supply pipe, and 12 is an auxiliary burner combustion control section. Patent applicant: Patent attorney representing Ishikawajima-Harima Heavy Industries Co., Ltd.
Nobuo Kinuya

Claims (1)

[Claims] In a diffused gas combustion method in which combustible diffused gas transferred from coke dry extinguishing equipment via a diffused gas pipe is combusted while adding fuel for combustion, the amount of diffused gas transferred through the diffused gas pipe is In order to achieve this, the supply amount of the auxiliary combustion fuel to be added to the diffused gas is calculated based on the determined value, and the amount of the auxiliary combustion fuel supplied is controlled to be increased or decreased based on the calculated value. Features: Dissipated gas combustion method in coke dry extinguishing equipment.