JP2894127B2 - Prevention device for black smoke emission from coke oven chimney - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing black smoke emission from a coke oven chimney, which prevents the emission of black smoke from a coke oven chimney generated during charging.

[0002]

2. Description of the Related Art In a coke oven, a large number of combustion chambers and carbonization chambers are alternately arranged. Each combustion chamber is supplied with fuel gas through a distribution branch pipe from a fuel gas main pipe, and has an air inlet and an air intake port. The combustion air is supplied through the heat storage chamber, and the combustion exhaust gas from each combustion chamber is discharged to the exhaust gas flue through the heat storage chamber and the exhaust gas control valve.

[0003] The combustion chamber is divided into two groups.
When one group is used for combustion, the other group is used for exhaust, and the heat in the exhaust is stored in bricks in the heat storage chamber. Then, combustion and exhaust are switched at regular time intervals, and when the combustion side is next reached, the heat of the bricks in the heat storage chamber stored up to that time is given to the supplied fuel gas and air on the side switched to combustion.

[0004] In the combustion in the combustion chamber as described above, the amount of combustion air is insufficient with respect to the amount of combustion gas to cause incomplete combustion, and black smoke may be generated from the chimney. Japanese Patent Application Laid-Open No.
179994. This is to prevent the generation of black smoke from the chimney by adjusting the combustion air amount according to the measured value of the fuel gas amount and the calorie amount and the number of the fuel gas cocks that are not closed, and performing complete combustion. .

[0005]

However, if the coke oven is used for a long time, cracks are formed in the joints of the brick wall between the carbonization chamber and the combustion chamber. When charging coal into the coking chamber, a large amount of generated gas is generated and fills the coking chamber, and gas leaks from the joint crack to the combustion chamber due to the coal charging pressure. For this reason, there is a problem that gas becomes excessive in the combustion chamber, causing non-combustion, and being discharged from the chimney as black smoke. The black smoke emission at the time of the charging is disclosed in Japanese Patent Application Laid-Open No. 63-179 for completely burning the fuel gas.
994 cannot be prevented by the method of JP-A-994.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems by the following apparatus. In the first invention, a dust concentration meter or an unburned detector provided in a chimney or a flue of a coke oven having a plurality of kilns, and a measured value of the dust concentration meter or the unburned detector becomes a predetermined value or more. Sometimes black smoke emission
Black smoke emission determination means to determine that black smoke emission
A kiln number collating means for collating the black smoke kiln number recording means for recording the kiln number of instrumentation Nyukama as black smoke kiln number, a kiln numbers and black smoke kiln number of instrumentation Nyukama when, when the authentication is successful A black smoke emission prevention device from a coke oven chimney having fuel control valve opening command means for issuing a command to open a fuel control valve in a combustion chamber of the kiln to a predetermined opening after fully closing the fuel control valve for a predetermined time.

A second aspect of the present invention is a device for preventing black smoke emission from a coke oven chimney having flow rate correction calculating means for calculating and correcting an increase in fuel supplied to a combustion chamber other than the black smoke discharging kiln.

In a third aspect, in addition to the first aspect, when the generation of black smoke is detected by a dust concentration meter or an unburned detector, the draft valve of the exhaust gas flue is opened and the amount of air in each combustion chamber is reduced. This is a device for preventing black smoke emission from a coke oven chimney having draft pressure setting command means for forcibly increasing it.

A fourth invention is a device for preventing black smoke from being discharged from a coke oven chimney having means for inputting a kiln number expected to emit black smoke into a black smoke kiln number recording means.

[0010]

If there is a crack in the brick wall of the carbonization chamber and the combustion chamber, the dust concentration of the combustion exhaust gas in the combustion chamber becomes high when pulverized coal is charged, and black smoke is discharged from the chimney. By using this phenomenon, it is possible to grasp the black smoke discharge kiln. That is, by providing a dust concentration meter in the chimney, the charging kiln when the dust concentration becomes equal to or higher than a certain value can be grasped as a black smoke discharge kiln. In addition, an unburned detector (for example, a CO meter) may be provided in the flue in place of the dust concentration meter, and the charging kiln when the CO% exceeds a certain value can be grasped as a black smoke discharging kiln. .

If the fuel control valve used for combustion in the combustion chamber of the kiln is fully closed at the time of charging the black smoke discharge kiln, non-combustion is eliminated and combustion gas containing a large amount of black smoke generated at the time of charging is removed. Is not emitted. Approximately 5 minutes after the start of charging, the fuel control valve is set to the set opening and combustion in the combustion chamber is restarted, so that operation is not hindered.

When the combustion in the combustion chamber of the black smoke discharge kiln is stopped, the gas flow to the combustion chambers other than the kiln may increase, causing nonflammability. Minute correction (weight loss correction), non-flammable in other kiln,
Black smoke generation can be prevented.

In the case of a kiln which cannot suppress the generation of black smoke by the correction of the gas flow increase to the combustion chamber other than the black smoke discharge kiln (adjustment of gas flow), or when non-combustion occurs other than charging, it is temporarily forcibly forced. The generation of black smoke can be prevented by increasing the amount of air in each combustion chamber.

If the number of a kiln which is expected to generate black smoke, such as a kiln or a repair kiln, which has been set as an operational kiln, is previously input to a computer by an input means of a CRT, black smoke at the time of charging such a kiln can be obtained. Can be prevented.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a fuel and exhaust gas system diagram of the coke oven. In the figure, a combustion chamber (symbol F) is provided on both sides of a carbonization chamber (symbol O) with a brick wall therebetween. For example, N
O. In the two carbonization chamber, the NO. 2 combustion chambers, N on the right
O. Three combustion chambers are provided. And, for example, 52
The coke oven is composed of two furnaces, with each carbonization room as one furnace unit.

The flow of the fuel gas and the combustion exhaust gas is set to NO.
A description will be given of a two carbonization chamber as an example. The fuel gas supplied to the fuel main pipe 1 is supplied to the gas cock 2 of the distribution pipe and the fuel control valve 12.
And enters a heat storage chamber (not shown) through which the preheated NO. 2
And NO. It is supplied to the burners of the three combustion chambers. The combustion exhaust gas is NO. After heating the brick wall of the 2 carbonization room, it enters a heat storage room different from the heat storage room and gives heat to the bricks of the heat storage room,
The exhaust gas passes through the exhaust gas control valves 21 and 23 and enters the exhaust gas flue 3.
In order to uniformly heat the brick wall of the combustion chamber and to switch the heat storage chamber, the flow path of the fuel gas is switched at regular intervals (usually 30 minutes).

After the combustion in the fuel gas passage is continued for 30 minutes, the fuel control valve 12 and the exhaust gas control valves 21 and 23
Are fully closed, and the fuel control valves 11 and 13 and the exhaust gas control valve 22, which have been fully closed until then, are opened, and the fuel gas flow path and the heat storage chamber for storing heat are switched. The combustion exhaust gas thus generated from each combustion chamber is collected in the exhaust gas flue 3 and discharged from the chimney 4. In the above facilities, the present invention is implemented as follows.

FIG. 1 is a diagram showing a hardware configuration of the apparatus of the present invention. FIG. 3 is a flowchart showing the arithmetic processing performed by the individual arithmetic processing means constituting the arithmetic processing unit 7 of the apparatus of the present invention. The dust concentration in the combustion exhaust gas is continuously measured by the dust concentration meter 5 provided in the chimney 4, and the measured value is transmitted to the arithmetic processing unit 7. Then, the dust concentration C transmitted to the arithmetic processing unit 7 becomes a predetermined value.
(In this case, 25% ) (step 31). Here, the predetermined value of 25% is a limit value at which the exhaust gas discharged from the chimney is seen as black smoke, and slightly varies depending on the furnace. Comparison results
As a result, if the dust concentration C is equal to or more than the predetermined value 25%, black smoke is discharged.
(Step 31, conditional branch C ≧ 25%: black smoke)
(Corresponds to emission determination means). It is determined that black smoke is emitted
Then, in the charging schedule section, the kiln charged at that time
(Step 32 , charging schedule ) is searched for the kiln number or carbonization room number (in the figure, described as kiln NO, the same applies hereinafter), and the kiln number is recorded in the black smoke kiln number recording means (Step 33 : black smoke kiln) Corresponding to the number recording means ).

In addition, the emission of black smoke can be detected by an unburned detector (CO meter in the figure) 9 provided in the flue instead of the dust concentration meter 5. In this case, the measurement value of the unburned detector 9 is transmitted to the arithmetic processing unit 7. The CO value transmitted to the arithmetic processing unit 7 is compared with a predetermined value (here, 0.15% ) (step 37). As a result of the comparison, the CO value is a predetermined value of 0.1.
If it is 5% or more, it is determined that black smoke is emitted (step 3).
7. Conditional branch CO is 0.15% or more: Black smoke emission determination means
Corresponding to). When it is determined that black smoke is discharged, the charging schedule section searches for the kiln number of the kiln currently charged (step 32 , charging schedule ), and the kiln number is stored in the black smoke kiln number recording means. (Step 33 : Black smoke
Corresponds to kiln number recording means ).

If there is an empty kiln, a repair kiln, or the like, the kiln number is set in the arithmetic processing unit in advance by the input means 8a of the CRT display 8. The set kiln number is recorded in the black smoke kiln number recording means (step 33).

While the fuel control valve is fully closed, the amount of increase in fuel to parts other than the kiln due to the closing of the fuel control valve is calculated by equation (1) using flow rate correction calculation means (step 36). Issue a fuel control valve opening command (step 3
5) The fuel supply amount to the entire furnace group is corrected by the furnace group fuel control valve 14.

[0022]

(Equation 1)

In addition to the method of correcting the increase in fuel by using the above formula, it is also possible to control the distribution pressure to each combustion chamber to be constant.

On the other hand, kiln number of the charged kiln whenever the loading of coal in the kiln is started is input to the arithmetic processing unit 7 (step 32, loading schedule), the kiln number of black smoke kiln number recording (Steps 33 and 34 : black smoke)
It corresponds to the kiln number recording means and the kiln number collating means, respectively ). If the charging kiln number matches the black smoke kiln number ( black smoke kiln NO in the figure) , the fuel control valve and exhaust gas used for combustion are determined from the opening and closing schedule of the fuel control valve and exhaust gas control valve in the combustion chamber of that kiln. The control valve is obtained, and the fuel control valve and the exhaust gas control valve are fully closed for a predetermined time (here, 5 minutes ) from the start of charging,
A command to “open thereafter” is issued from the fuel control valve opening command means (step 35).

When black smoke is suddenly generated during control or when control is not performed as described above, an unburned detector installed in the exhaust gas flue, for example, a CO meter, or a dust concentration meter installed below the chimney Therefore, the draft pressure setting command means increases the opening degree of the draft valve (furnace exhaust gas control valve) 24 to forcibly pull the draft (lower the draft pressure). For example, the draft is forcibly pulled by the draft pressure setting command means when the CO meter is 0.15% or more and the dust concentration meter is 25% or more (steps 37 and 31). % Or less and the value of the dust concentration meter becomes 25% or less, the air amount is restored to the original set value (step 3).
8). Further, an action can be taken by detecting a rising tendency instead of the threshold values of the dust concentration meter and the CO meter (in this example, 25% and 0.15%, respectively).

The operation result of the operation processing unit 7 is a CRT
Displayed on display 8. For example, in FIG. At the start of charging, the combustion chamber NO. 2 and NO. In the combustion of No. 3, the fuel control valve 12 and the exhaust gas control valves 21 and 23 are fully closed for 5 minutes from the start of charging, and then a command to open the fuel control valve is issued from the fuel control valve opening command means (step 35).

[0027]

Since the present invention is configured as described above, the following effects can be obtained. (1) The black smoke generating kiln can be automatically recorded. (2) When the charging kiln corresponds to a black smoke generating kiln, the combustion in the combustion chamber is automatically stopped for a certain period of time from the start of charging, so that the discharge of black smoke from the chimney at the time of charging is prevented. (3) In addition to the action of (2), correction of the increase in fuel to the combustion chambers other than the black smoke discharge kiln, and to each combustion chamber when black smoke discharge is detected by a dust concentration meter or unburned detector By taking action to increase the amount of air, black smoke emission can be more completely prevented.

The arithmetic processing unit of the present invention may be realized by one computer as in the embodiment, but may be replaced by a plurality of computers or microprocessors.
Needless to say.

[Brief description of the drawings]

FIG. 1 is a diagram showing a hardware configuration of a device of the present invention.

FIG. 2 is a fuel and exhaust gas system diagram of a coke oven.

FIG. 3 is a flowchart showing an arithmetic process performed by individual arithmetic processing units constituting an arithmetic processing unit 7 included in the apparatus of the present invention.

[Explanation of symbols]

 Reference Signs List 4 chimney 5 dust concentration meter 6 charging kiln 7 arithmetic processing unit (calculator) 9 unburned detector (CO meter) 8 CRT display 12 fuel control valve 14 furnace group fuel control valve 22 exhaust gas control valve 24 draft valve

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Atsumi Watanabe 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. Examiner Ichira Karaki (56) References JP-A-61-264091 (JP, A JP-A-54-41902 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) C10B 45/00 C10B 41/00 C10B 57/00 C10B 21/10

Claims (4)

(57) [Claims] A chimney of a coke oven having a plurality of kilns or
And black smoke emission determining means for determining a black smoke exhaust when the dust concentration meter or not燃検out meter provided in the flue, the measured value of the dust densitometer or not燃検out meter exceeds a predetermined value, the black A black smoke kiln number recording means for recording the kiln number of the charging kiln when it is determined that the smoke is discharged as a black smoke kiln number; and a kiln number matching means for comparing the kiln number of the charging kiln with the black smoke kiln number. A fuel control valve opening command means for issuing a command to open the fuel control valve of the combustion chamber of the kiln to a predetermined opening after the fuel control valve is fully closed for a predetermined time when the verifications match, thereby preventing black smoke emission from the coke oven chimney. apparatus. 2. The apparatus for preventing black smoke emission from a coke oven chimney according to claim 1, further comprising a flow rate correction calculating means for calculating and correcting an increase in fuel supplied to a combustion chamber other than the black smoke exhaust kiln. 3. A draft pressure setting command means for opening a draft valve of an exhaust gas flue and forcibly increasing the amount of air in each combustion chamber when black smoke generation is detected by a dust concentration meter or an unburned detector. The apparatus for preventing black smoke emission from a coke oven chimney according to claim 1. 4. The apparatus for preventing black smoke emission from a coke oven chimney according to claim 1, further comprising means for inputting a kiln number expected to emit black smoke into the black smoke kiln number recording means.