JP3283355B2 - Pressure control method for coke oven equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling pressure in a coke oven facility.

[0002]

2. Description of the Related Art A coke oven is used to produce coke by subjecting raw coal to heating and carbonization.

FIG. 3 shows a schematic configuration of a conventional coke oven facility of this kind.

That is, in FIG. 3, the coke oven equipment includes a coking chamber 1 and a slip joint 3 in the coking chamber 1.
And a combustion chamber 2 to which a so-called flew top 12 is connected, and a flue 9
The raw coal blended in a predetermined manner is charged into the carbonization chamber 1 by a coal loading vehicle, and then the air is introduced into the carbonization chamber 1. In a cut-off state, a certain amount of combustion gas and combustion air required for complete combustion are supplied into the combustion chamber 2, and the raw coal in the carbonization chamber 1 is carbonized by the combustion heating to produce coke. It is.

Here, the coal gas generated by the dry distillation of the raw coal is taken out of the carbonization chamber 1 by the riser pipe 4 and then called a so-called collecting main 5.
Then, it is transferred to a gas purification step (not shown) via a take-out line 6 provided with a pressure control valve 7 such as a butterfly valve.

In this case, with the generation of coal gas in the coking chamber 1, the pressure in the coking chamber 1 increases the quality of the coke to be produced, and also protects the refractory brick at the kiln opening. For the purpose, the opening of the pressure control valve 7 is automatically controlled so that the gas pressure in the collecting main 5 is kept constant.

On the other hand, the exhaust gas after combustion in the combustion chamber 2 passes through a heat storage chamber 8 and similarly passes through a flue 9 provided with a pressure control valve 10 such as a butterfly valve, and then passes through a chimney 1.
Emitted from 1.

Even in this case, the pressure in the combustion chamber 2 automatically controls the opening of the pressure control valve 10 in order to perform complete combustion.

In the combustion chamber 2, the flue gas is drafted in accordance with the change of the O ₂ concentration so that the O ₂ concentration contained in the exhaust gas after the combustion is kept constant in the flue 9. The pressure is automatically adjusted, so that the combustion pressure in the combustion chamber 2 fluctuates according to the draft pressure in the flue 9.

That is, in the case of the conventional coke oven equipment having the above-described structure, the pressure in the coking chamber 1, that is, the collecting main pressure, the pressure in the combustion chamber 2, and the flue-top pressure are individually different from each other. The result is controlled.

More specifically, the pressure in the carbonization chamber 1 is controlled as follows.

That is, as shown in FIG. 4, in a normal case, a differential pressure meter 31 is used to detect a differential pressure between the atmospheric pressure a as a reference and the collecting gmain pressure b ₁ , and The differential pressure is controlled so as to be constant.
The differential pressure signal c ₁ which is detected sends to the regulator 32 by the pressure control valve 7 by the regulator 32 opens and closes in response to differential pressure, resulting in the chamber pressure of the coking chamber 1, i.e. collector quenching Maine The pressure is always maintained at a constant pressure.

The pressure in the combustion chamber 2 is controlled as follows.

That is, as shown in FIG.
First, the combustion air is taken into the air passage 15 from the atmosphere, preheated through the heat storage chamber 14, supplied to the combustion chamber 2, and brought into contact with the combustion gas from the combustion gas pipe 13. It burns and carbonizes the raw coal in the carbonization chamber 1.
On the other hand, the exhaust gas after combustion in the combustion chamber 2 is stored in the heat storage chamber 8.
Through the stack 9 to the chimney 11.

As shown in FIG. 5B, the O ₂ concentration d contained in the exhaust gas after combustion in the combustion chamber 2 is determined by measuring the O ₂ concentration communicated with the flue 9. detected by gauge 33, and as in the case of the here, the normal case, using a differential pressure measuring gauge 34 detects the differential pressure as a reference and the atmospheric pressure a between the exhaust gas pressure b _2, said difference and controls so that the O ₂ concentration together with the pressure becomes constant, the detected by the O ₂ concentration measuring meter 33 O ₂ concentration signal e
And the differential pressure signal c detected by the differential pressure meter 34
It sends and ₂ to the regulator 35, the pressure control valve 10 by the regulator 35 O ₂ concentration and the open and close in response to differential pressure, the draft pressure in the flue 9, thus resulting in,
The pressure inside the combustion chamber 2, that is, the flue top pressure, is constantly maintained at a constant pressure.

[0016]

The control of the furnace pressure in the conventional coke oven equipment is performed as described above. In this conventional case, the combustion chamber 2 contains the exhaust gas after combustion. Since the O ₂ concentration is controlled to be kept constant in the flue 9, the draft pressure in the flue 9 fluctuates with the fluctuation of the O ₂ concentration in the exhaust gas. Fluctuation of the draft pressure in the stack 9 causes the combustion chamber 2
Of the room pressure and eventually the flue top pressure.

Therefore, due to such fluctuations in the indoor pressure in the combustion chamber 2, if the flue top pressure becomes lower than the indoor pressure in the carbonization chamber 1 by about 1 mm to ₃ mmH ₂ O, for example, When the joint of the slip joint 3 that connects the upper part of the coking chamber 1 and the upper part of the combustion chamber 2 is open, the coal gas generated in the coking chamber 1 passes through the slip joint 3, here,
The fluid will leak into the flew top 12 where the pressure drops.

Here, in the combustion chamber 2, a certain amount of combustion gas and combustion air required for combustion are supplied to perform complete combustion. Leakage of coal gas into the fuel cell causes incomplete combustion. As a result, black smoke is emitted from the chimney 11 as evidence of incomplete combustion, which is not environmentally preferable and lowers combustion efficiency. There was an inconvenience.

The present invention has been made in order to solve such a conventional problem.
A method for controlling pressure in a furnace of a coke oven facility in which a constant amount of combustion gas and combustion air supplied into a combustion chamber are constantly and completely burned to improve environmental disadvantages and a decrease in combustion efficiency. It is to provide.

[0020]

In order to achieve the above object, a method for controlling the pressure in a furnace of a coke oven equipment according to the present invention is characterized in that the pressure difference between the chamber pressure in the coking chamber and the flue top pressure in the combustion chamber is: The pressure is controlled so as to be always kept constant.

Here, the inventors of the present invention have found that between the draft pressure of the flue and the flue top pressure of the combustion chamber, y = ax + b, where x: pressure fluctuation value y; correction value a; coefficient b; We found that there is a correlation that can be expressed by a constant.

Regarding the furnace pressure control in the present invention,
This is performed by applying this correlation equation.

More specifically, there is a relationship between the draft pressure of the flue and the flue top pressure of the combustion chamber as shown in FIG.

That is, in FIG. 2, the coke oven equipment shown in FIG. 3, in this case, the effective volume of each of the plurality of coking chambers 1 is 3
In a 6 m ³ coke oven facility, the draft pressure of the flue 9 that controls the pressure in the combustion chamber 2 was changed by adjusting the opening of a pressure control valve 10 installed in the flue 9, and the change was dealt with. The fluctuation of the flue top pressure in the flue top 12 was measured and determined. In addition, each measurement point was measured in a plurality of combustion chambers 2 arbitrarily selected for a certain flue draft pressure.

In the measurement of the flue top pressure, TYPE WO-80 0-30 mmH ₂ O manufactured by YAMAMOTO ELECTRIC WORKS was used as a pressure gauge, and the pressure of the flue draft was measured in the same manner. TYPE MIO.45W manufactured by NIHON REGURETOR CO.LTD. Was used as a measuring meter.

That is, according to the present invention, a carbonization chamber for charging raw coal is connected to the carbonization chamber via a slip joint at an upper portion of the chamber, and the supplied combustion gas and air are burned to burn the combustion gas and air therein. A combustion chamber for carbonizing raw coal;
In a coke oven facility having at least a flue for guiding flue gas from the combustion chamber to a chimney, in response to fluctuations in the draft pressure in the flue, a previously determined flue pressure in the flue and a flue-top pressure in the combustion chamber. And calculating a corresponding flue-top pressure from the correlation formula, and controlling the pressure difference between the calculated flue-top pressure and the indoor pressure of the coking chamber, wherein the pressure in the furnace of the coke oven equipment is controlled. It is.

[0027]

Therefore, in the pressure control method for a coke oven according to the present invention, the pressure difference between the chamber pressure in the coking chamber and the flue-top pressure in the combustion chamber is always kept constant.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a method for controlling the pressure in a coke oven facility according to the present invention will be described in detail with reference to FIG.

FIG. 1 is a schematic sectional view showing a schematic configuration of a coke oven facility to which one embodiment of the method of the present invention is applied.

In FIG. 1, the main part of the coke oven equipment to which the present embodiment is applied is almost the same as the above-described conventional example.

That is, the coal gas generated in the carbonization chamber 1 is:
It is taken out through the riser pipe 4 and is transferred from the collecting main 5 to a gas purification step (not shown) through a take-out line 6 provided with a pressure control valve 7 such as a butterfly valve.

In the combustion chamber 2 in which the flue top 12 in the upper part of the chamber is connected to the carbonization chamber 1 via the slip joint 3, a certain amount of combustion gas and combustion air required for complete combustion are supplied. The supplied coal is subjected to dry distillation of the raw coal in the carbonization chamber 1 by the combustion heating, and the exhaust gas after combustion passes through a heat storage chamber 8, passes through a flue 9 provided with a pressure control valve 10 such as a butterfly valve, and passes through a chimney. It is discharged from 11.

On the other hand, in the present embodiment, in the carbonization chamber 1 side, the differential pressure between the atmospheric pressure a and the collecting main pressure b ₁ as a reference is detected by the differential pressure gauge 16 and the detected differential pressure signal is detected. c ₁ is sent to a regulator 17, and also on the combustion chamber 2 side, a differential pressure between the reference atmospheric pressure a and the collecting main pressure b ₂ is detected by a differential pressure gauge 18, and the detected differential pressure to send a signal c ₂ to the regulator 19, also separately configured by the signal converter 20 which acts as described below provided.

In this case, the coefficient a and the constant b in the correlation equation between the draft pressure of the flue 9 and the flue-top pressure of the combustion chamber 2 shown in FIG. In advance, the flue draft pressure and the combustion chamber flue top pressure are measured in advance and obtained from the correlation formula obtained in advance,
The correlation equation is input to the signal converter 20 in advance.

In the case of this embodiment, on the side of the latter combustion chamber 2, the internal pressure of the combustion chamber 2 increases and decreases the opening and closing of the pressure control valve 10 in the same manner as in the above-described conventional example. It is performed by control.

On the other hand, for example, when the amount of exhaust gas decreases in the flue 9, the draft pressure of the flue 9 fluctuates according to the degree of opening of the pressure control valve 10. By inputting x to the signal converter 20 as the pressure fluctuation value signal 22, the correction value y of the Flue-top pressure corresponding to the pressure fluctuation value x is calculated by the signal converter 20 according to a previously input correlation equation. Is calculated.

Further, in this case, the correction value y is used as a correction value signal 21 of the flue-top pressure with respect to the pressure fluctuation value x to the regulator 17 on the side of the carbonization chamber 1 and the differential pressure signal c ₁ . The regulator 17 presets the flue-top pressure to be a pressure value corresponding to the correction value y, or the differential pressure between the pressure in the carbonization chamber 1 and the chamber pressure in correspondence with the correction value y. The opening and closing of the pressure control valve 17 is controlled so as to obtain a pressure value, whereby the internal pressure of the carbonization chamber 1 can be automatically controlled.

[0038]

As described above in detail with reference to the embodiments,
According to the present invention, a carbonization chamber into which raw coal is charged, and connected to the carbonization chamber via a slip joint at the upper part of the chamber,
In a coke oven facility having at least a combustion chamber for burning the supplied combustion gas and air to dry-distill the raw coal in the coking chamber and a flue for guiding flue gas from the combustion chamber to a chimney, Corresponding to the fluctuation of the draft pressure, the corresponding flue-top pressure is calculated from the correlation formula between the flue-top pressure in the flue and the flue-top pressure determined in advance, and the calculated flue-top pressure and the indoor pressure of the carbonization chamber. The pressure difference between the chamber pressure in the carbonization chamber and the flue-top pressure in the combustion chamber is always kept constant, regardless of the variation in the draft pressure in the flue. This prevents coal gas from leaking from the carbonization chamber to the combustion chamber, thereby improving incomplete combustion in the combustion chamber and eliminating black smoke from the chimney, as well as the combustion effect. Also improved is clogging of the heat storage chamber is also reduced at the same time, further it has excellent features such as recovery of coal gas is also significantly improved.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a schematic configuration of a coke oven facility to which an embodiment of a furnace pressure control method according to the present invention is applied.

FIG. 2 is a graph showing a relationship between a flue draft pressure and a combustion chamber flue top pressure in the method of the embodiment.

FIG. 3 is a schematic cross-sectional view showing a schematic configuration of a coke oven facility according to a conventional furnace pressure control method.

FIG. 4 is a schematic cross-sectional view for explaining a method of controlling the indoor pressure of the carbonization chamber in the conventional example.

FIGS. 5 (a) and 5 (b) are schematic cross-sectional views for explaining a method of controlling the indoor pressure of a combustion chamber in the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Carbonization chamber 2 Combustion chamber 3 Slip joint 4 Rise pipe 5 Collecting main 6 Extraction line 7 Pressure control valve 8 Thermal storage chamber 9 Flue 10 Pressure control valve 11 Chimney 12 Flue top 16 Differential pressure gauge 17 Regulator 18 Differential pressure measurement Total 19 Regulator 20 Signal converter 21 Correction value signal 22 Pressure fluctuation value

Continuation of front page (56) References JP-A-6-41537 (JP, A) JP-A-6-100866 (JP, A) JP-A-5-117660 (JP, A) (58) Fields investigated (Int) .Cl. ⁷ , DB name) C10B 57/00-57/18 C10B 21/00-21/26 C10B 27/00-27/06

Claims (1)

(57) [Claims] 1. A coking chamber into which raw coal is charged and connected to the coking chamber via a slip joint at an upper portion of the chamber to burn the supplied combustion gas and air to dry distill the raw coal in the coking chamber. In a coke oven facility comprising at least a combustion chamber to be treated and a flue for guiding flue gas from the combustion chamber to a chimney, corresponding to a variation in the draft pressure in the flue, a previously determined flue draft pressure. A coke oven facility comprising: calculating a corresponding flue-top pressure from a correlation formula with the flue-top pressure in the combustion chamber; and controlling a differential pressure between the calculated flue-top pressure and the chamber pressure in the coking chamber. Furnace pressure control method.