JP2565063B2 - Coke oven carbonization chamber pressure control method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method for maintaining a constant pressure in the carbonization chamber of a coke oven that is performing a block kiln removal method.

[0002]

2. Description of the Related Art The pressure in the carbonization chamber during coal carbonization in a coke oven is determined by the amount of coke oven gas generated by heating the charged raw coal. That is, as shown in FIG. 4, the amount of coke oven gas generated is large immediately after the coal is charged, and the internal pressure of the furnace is positive pressure, and the amount of coke oven gas generated is small and the pressure is negative at the end of dry distillation. When the internal pressure of the coke oven carbonization chamber becomes positive, there are problems such as the sealing property of the furnace lid, but gas leakage due to the generated coke oven gas is likely to occur, and conversely, when the internal pressure becomes negative pressure, Suction of carbon causes the carbon adhering to the carbonization chamber to be burnt out, causing the coke oven gas to leak into the combustion chamber due to brick joint breakage, causing black smoke from the chimney due to incomplete combustion and the wall of the carbonization chamber due to cold air intrusion. Brick quenching causes deterioration.

Therefore, in the current coke oven,
The coke oven gas generated in each carbonization chamber for each furnace group is collected in the air collection main via the riser pipe and the bend pipe, and suctioned into the gas purification process via the suction main pipe for processing. The opening / closing angle of the pressure adjusting valve provided in the suction main pipe is adjusted, and the opening / closing angle is controlled so that the pressure in the immediate vicinity of the pressure adjusting valve becomes a predetermined pressure. This method is a pressure control method for each furnace group,
It is not a pressure control method for each kiln corresponding to the change in the pressure in the carbonization chamber shown in FIG. 4 in the coal carbonization process.

On the other hand, in the operation of a coke oven, a continuous kiln removal method has been recently proposed in which kilns are taken out in order of the kiln number. As a general kiln removal method, coke is used to ensure uniformity of carbonization time. One row (1, 6, 11,
16, ..., 2 columns (2, 7, 12, 17, ...), 3 columns (3, 8, 13, 18, ...), 4 columns (4, 9, 1)
4, 19, ..., 5 rows (5, 10, 15, 20, ...)
Is divided into 5 blocks, and a block kiln extraction method is carried out in which 1 row, 3 rows, 5 rows, 2 rows, and 4 rows are fired in this order. This block kiln removal method is a method in which the kiln removal work is always performed at the shortest pitch regardless of the operating rate of the furnace, and a certain block is kilned, and then the interruption time is taken.

As a method for controlling the in-furnace pressure for each of the coke oven carbonization chambers, that is, for each kiln, at least a pair of air collecting pipes and means for selectively connecting the air collecting pipes to the respective furnace chambers of the coke oven are provided. The gas discharged from each of the carbonization chambers is passed through one of the paired first air collecting pipes during the set carbonization time after charging the coal to be carbonized, and then the gas is paired during the rest of the carbonization time. A method for separately setting the gas pressure in the gas collecting pipe so that the gas pressure in the second gas collecting pipe is maintained lower than that in the other second gas collecting pipe (JP-A-50-13401), and coal to the coke oven During the period from the start of charging to the closing of the charging lid, the coke oven furnace pressure is continuously measured, and the ejector effect in the ascending pipe bend pipe is adjusted so that this measured value follows a predetermined pattern. Control the furnace pressure That method (JP-B-60-638
No. 7), on the upstream side of the suction pipe for the gas generated by the coke oven,
A coke oven generated gas branch pipe with a bifurcated branch pipe is provided, a control fluid inlet for controlling the distribution amount of the generated gas to each branch pipe is attached to this branch pipe, and one of the branch pipes is located downstream of the suction pipe. A method of providing a fluid resistance part configured such that the generated gas flowing through the other side has a fluid resistance of the generated gas flowing through the other side (Japanese Patent Laid-Open No. 61-241388), a spiral element is provided in the middle of the suction pipe for the generated gas of the coke oven. In the method for controlling the furnace pressure of the coke oven generated gas by adjusting the suction amount of the coke oven generated gas by adjusting the control fluid sucked into the element, the control fluid is passed through the ejector in advance, where the spiral element is used. A method of sucking and mixing the coke oven generated gas before the inflow or after the inflow of the vortex element, and then adjusting the suction amount of the coke oven generated gas with this mixed gas (JP-A-61-2).
No. 41389 gazette), a furnace pressure control device for a coke oven carbonization chamber having a rising pipe in the upper part, and a furnace pressure detector provided in the upper part of the carbonization chamber, and a furnace pressure control provided in the rising pipe. There has been proposed a device including a valve and a control device for controlling the in-furnace pressure control valve according to a signal from the in-furnace pressure detector (Japanese Utility Model Laid-Open No. 62-28846).

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The method disclosed in Japanese Patent Publication No. 401 is an excellent method for controlling the pressure inside the furnace for each kiln, but it is difficult to implement it when it is applied to an existing coke oven, because it requires a major facility modification. Further, the method disclosed in Japanese Examined Patent Publication No. 60-6387 is a control of the furnace pressure from the start of the charging of the coal to the coke furnace until the closing of the charging lid. is not. Further, the methods disclosed in JP-A-61-241388 and JP-A-61-241389 are
Similar to Japanese Patent Laid-Open No. 50-13401, application to an existing coke oven requires major equipment modification, which is difficult to implement. Furthermore, the device disclosed in Japanese Utility Model Laid-Open No. 62-28846 controls a reactor internal pressure control valve provided in the riser pipe by a signal from a reactor internal pressure detector. There is a limit to the furnace pressure control only by controlling the opening of the control valve, and the adhesion of tar, carbon, etc. to the furnace pressure detector and the furnace pressure control valve causes problems in the detection and operating conditions. .

The object of the present invention can be easily applied to an existing coke oven, and can control the pressure leakage in the coke oven in the coke oven, which can prevent gas leakage from the carbonization chamber, generation of black smoke from the chimney, and deterioration of the bricks in the carbonization chamber. To provide a method.

[0008]

[Means for Solving the Problems] The inventors of the present invention have conducted various studies and tests in order to achieve the above object. As a result, attention was paid to the fact that coke oven kiln removal is generally performed by the block kiln removal method, and the adjacent kilns currently in the kiln removal block row have a considerable amount of time elapsed since they have been charged, and the amount of gas generated is is decreasing. For example, when the kiln of the row 3 is charged, the amount of gas generated in the kilns of the rows 2 and 4 adjacent to each other is considerably reduced as shown in FIG. The pressure is about to become negative. Therefore, by providing a connecting pipe having an on-off valve in the bend pipe portion of the rising pipe of each adjacent carbonization chamber, and connecting the kiln immediately after charging with the kiln where the pressure in the adjacent carbonization chamber is about to become negative pressure. ,
The pressure in the adjoining carbonization chamber from the kiln immediately after charging is about to become negative, and the generated gas flows to the kiln, which prevents gas leakage from the kiln immediately after charging and the pressure in the adjoining carbonization chamber is about to become negative. The inventors have reached the present invention by investigating that negative pressure in the kiln is prevented.

That is, according to the present invention, in a method for controlling the furnace pressure in a carbonization chamber of a coke oven that employs a block kiln extraction method, an ascending pipe bend pipe of an adjoining carbonization chamber is provided in an ascending pipe bend pipe portion of each carbonization chamber. A connecting pipe with a shut-off valve that communicates with the section is provided, and the connecting pipe that connects the rising pipe bend pipe part of the kiln immediately after the coal charging and the rising pipe bend pipe part of the kiln where the pressure inside the carbonization chamber adjacent to the furnace is about to become negative The shut-off valve is opened to communicate for a predetermined time, and a part of the generated gas is allowed to flow from the kiln immediately after charging to the kiln where the pressure in the adjacent carbonization chamber is about to become negative.

[0010]

In the present invention, the ascending pipe bend pipe portion of each carbonization chamber is provided with a connecting pipe with a shut-off valve that communicates with the ascending pipe bend pipe portion of the adjacent carbonization chamber, and the ascending pipe bend of the kiln immediately after the coal is charged. The pressure inside the carbonization chamber adjacent to the pipe is about to become negative pressure. The rising pipe of the kiln. The cutoff valve of the connecting pipe that connects the bend pipe is opened to allow communication for a predetermined time. Since a part of the generated gas is caused to flow into the kiln where the pressure is about to become a negative pressure, the furnace pressure of the kiln with a large amount of gas generation immediately after charging is reduced and gas leakage is prevented. In addition, the pressure inside the kiln, where the pressure in the adjacent carbonization chamber is about to become negative, rises and the negative pressure is prevented, and the carbon adhering to the carbonization chamber due to air infiltration is burned out, and the brick is broken into the combustion chamber. It is possible to prevent black smoke from being generated from the chimney due to incomplete combustion due to leakage of the generated coke oven gas, and also to prevent deterioration of the bricks in the carbonization chamber due to rapid cooling due to cold air intrusion.

The communication between the kiln immediately after the coal is charged and the kiln adjacent to the carbonization chamber where the pressure inside the carbonization chamber is about to become negative pressure is referred to as edge cutting when the kiln before the extrusion is about to become negative pressure. Since the carbonization chamber and the main air collection tube are shut off to burn off the carbon in the carbonization chamber, it is necessary to close the shutoff valve of the connecting pipe to cut off the adjacent kiln before that. When cutting and communicating with adjacent kilns, supply and withdraw water for water sealing to the U-shaped connecting pipe. Installation of the connecting pipe that connects the ascending pipe bend pipe part of each carbonization chamber and the ascending pipe bend pipe part of the adjacent carbonization chamber is because the ascending pipe bend pipe part has inspection holes and cleaning holes. Can be easily applied to an existing coke oven.

[0012]

【Example】

Embodiment 1 Details of the present invention will be described below with reference to FIGS. 1 and 2 showing an embodiment. 1 is a partially enlarged plan view of an apparatus for carrying out the method of the present invention, and FIG. 2 is a front view of FIG. FIG.
In FIG. 2, reference numerals 1, 2, and 3 are riser pipes erected at the end of the coking furnace of the coke oven, and 4, 5, and 6 are riser pipes 1, 2, and
Bend pipes for connecting 3 and the main air collecting pipe 7 via a dish valve not shown, 8, 9 and 10 are canopies of the ascending pipes 1, 2 and 3, and the canopies 8, 9 and 10 are closed and not shown. When the disc valve is opened, the carbonization chambers and the main air collecting pipe 7 are connected to each other via the rise pipes 1, 2, 3 and the bend pipes 8, 9, 10 and the dish valve (not shown) is closed to open the canopy. When opened, each carbonization chamber and the main air collecting main pipe 7 are cut off.

Adjacent bend pipes 4, 5 and 6 are communicatively connected via U-shaped connecting pipes 11, 12 and 13, respectively, to the U-shaped connecting pipes 11, 12 and 13, respectively. Low water supply pipes 14, 15, 16 and low water discharge pipes 17, 1
8 and 19 are connected to the bottom of the U-shape, and the drainage pipe 17 and 1
When 8 and 19 are closed and the cheap water supply pipes 14, 15 and 16 are opened, the cheap water is supplied to the U-shaped connecting pipes 11, 12 and 13 and is cut off by a water seal, and the safe water supply pipes are also provided. 14, 1
After closing Nos. 5 and 16 and opening the low-water extraction pipes 17, 18 and 19 to extract low-water, the low-water extraction pipes 17, 18 and 19
Is closed, the adjacent bend pipes 4, 5 and 6 are configured to communicate with each other via the U-shaped connecting pipes 11, 12 and 13.

With the above construction, if coal is charged into the carbonizing chamber in which the rising pipe 2 is erected, for example, one of the adjacent carbonizing chambers in which the rising pipes 1 and 3 are erected, for example, In the carbonization chamber in which the riser pipe 1 is erected, the gas generation amount decreases at the final stage of carbonization, and the pressure in the carbonization chamber is close to negative pressure. Therefore, the low-water supply pipe 14 of each U-shaped connecting pipe 11 is closed to open the low-water drainage pipe 17, and the low-water drainage pipe 17 is closed after discharging low-water in the U-shaped low-pressure connecting pipe 11. By doing so, the bend pipes 4 and 5 communicate with each other, and the ascending pipe 2, the bend pipe 5, and the U-shaped connecting pipes 11 from the carbonization chamber with a large amount of generated gas immediately after coal charging.
, The amount of gas generated at the end of dry distillation is reduced and the internal pressure of the furnace is close to negative pressure. Part of the generated gas flows in.

For this reason, the gas generated in the carbonization chamber, which has a large amount of gas generation and a high furnace pressure immediately after the coal is charged, is introduced into the main air collecting pipe 7 through the rising pipe 2 and the bend pipe 5, and at the end of the dry distillation stage. Since the amount of gas generated is reduced and the internal pressure of the furnace is close to negative pressure, it is introduced through the U-shaped connecting pipes 11 into the bend pipe 4 of the carbonization chamber, so the internal pressure of the furnace is reduced and gas leakage is prevented. It On the other hand, in the carbonization chamber where the gas generation amount decreases at the end of dry distillation and the furnace pressure is close to negative pressure, the gas generated in the carbonization chamber where the gas generation amount is high and the furnace pressure is high immediately after the coal charging is U-shaped. Tube 11
Since it is introduced into the bend pipe 4 via the bend pipe, the negative pressure inside the furnace is alleviated, the burning of the carbon adhering to the furnace wall due to the entry of air into the carbonization chamber is prevented, and the carbonization chamber moves from the carbonization chamber to the combustion chamber due to joint breakage. It is possible to prevent the generation of black smoke from the chimney due to the leakage of the generated gas.

In the above operation, the charring chamber in which the gas generation amount decreases at the end of dry distillation and the furnace internal pressure is close to negative pressure closes the plate valve provided in the bend pipe 4 in preparation for extrusion and opens the canopy 8. Since the edge of the air collecting main 7 is cut off, the low water supply pipe 14 is opened prior to that to supply the low water to the U-shaped connecting pipe 11 to seal the water, and the communication between the bend pipes 4 and 5 is cut off. To do. At this time, a large amount of gas was generated immediately after the coal was charged, and the amount of gas generated in the carbonization chamber, where the pressure inside the furnace was high, decreased, and the pressure inside the reactor was also lower than the pressure at which gas leakage occurred, so a particular problem occurred. There is nothing to do. By repeating the above operation every time the coal is charged into the carbonization chamber, it is possible to prevent gas leakage due to an increase in the furnace pressure in the carbonization chamber, which has a large amount of gas generation immediately after the coal is charged, and to reduce the amount of gas generation at the end of dry distillation. The decrease in the furnace pressure in the existing carbonization chamber is mitigated by the furnace pressure in the carbonization chamber where a large amount of gas is generated immediately after charging the adjacent coal, and the burnout of the carbon adhering to the furnace wall due to the intrusion of air into the carbonization chamber is prevented. It is possible to prevent generation of black smoke from the chimney due to leakage of generated gas from the carbonization chamber to the combustion chamber due to breakage.

Example 2 In a carbonization chamber equipped with the apparatus described in Example 1 above,
A carbonization chamber adjacent to the carbonization chamber immediately after charging, in which the gas generation amount is reduced at the end of dry distillation and the internal pressure of the furnace is close to negative pressure, is connected to each other through U-shaped connecting pipes 11 provided in the bend pipe section. A part of the generated gas was introduced into the bend pipe of the carbonization chamber at the end of dry distillation adjacent to the carbonization chamber immediately after charging. In that case, the change with time in the furnace pressure in the carbonization chamber immediately after charging was measured. The result is shown in FIG. As shown in FIG. 3, the pressure in the furnace of the carbonization chamber in the gas leakage generation region immediately after charging dropped and was lower than the gas leakage generation pressure shown by the chain line immediately after charging, and remained almost stable. This means that gas leakage due to an increase in the furnace pressure in the carbonization chamber with a large amount of gas generation immediately after coal charging can be prevented, and a decrease in the furnace pressure in the carbonization chamber where the gas generation amount is decreasing at the end of dry distillation is due to the adjacent coal It is shown that the gas pressure is relieved by the pressure in the furnace in the carbonization chamber, which generates a large amount of gas immediately after charging.

[0018]

As described above, according to the method of the present invention, it is possible to prevent gas leakage due to an increase in the furnace pressure in the carbonization chamber, which has a large gas generation amount immediately after the coal is charged, and to reduce the gas generation amount at the final stage of carbonization. Can reduce the pressure drop in the furnace
Generation of black smoke from the chimney and deterioration of the carbonization chamber wall can be prevented, environmental problems can be improved and coke oven furnace body deterioration can be suppressed.

[Brief description of drawings]

FIG. 1 is a partially enlarged plan view of an apparatus for carrying out the method of the present invention. It is a front view of FIG.

FIG. 2 is a front view of FIG.

FIG. 3 is a graph showing the relationship between the pressure in the furnace of the carbonization chamber immediately after charging and the dry distillation time in Example 2.

FIG. 4 is a graph showing a relationship between general furnace pressure and carbonization time from the charging of coal to the end of carbonization.

FIG. 5 is a graph showing changes over time in the pressure in the carbonization chamber of each kiln during normal kiln removal.

[Explanation of symbols]

 1, 2, 3 Ascending pipe 4, 5, 6 Bend pipe 7 Air collecting main pipe 8, 9, 10 Canopy 11, 12, 13 U-shaped connecting pipe 14, 15, 16 Low water supply pipe 17, 18, 19 Low Drain pipe

Front Page Continuation (56) References JP-A-51-62802 (JP, A) JP-A-50-65503 (JP, A) JP-A-50-13401 (JP, A) JP-A-50-7801 (JP , A) Actual development Sho 62-28846 (JP, U) Japanese Patent Sho 18-2533 (JP, B1)

Claims (2)

(57) [Claims] 1. A method of controlling a furnace pressure in a coking furnace carbonization chamber in which a block kiln removal method is implemented, wherein the ascending pipe bend pipe portion of each carbonization chamber communicates with the ascending pipe bend pipe portion of an adjacent carbonization chamber. A connecting pipe with a shut-off valve is installed, and the shut-off valve of the connecting pipe that connects the ascending pipe bend pipe part of the kiln immediately after the coal is charged with the negative pressure of the adjoining carbonization chamber of the kiln To open for a predetermined period of time and allow a part of the generated gas to flow from the kiln immediately after charging into the kiln where the pressure inside the adjacent carbonization chamber is about to become negative . 2. The coke according to claim 1, wherein the shutoff valve of the connecting pipe connecting the ascending pipe bend pipe portion of each carbonization chamber and the ascending pipe bend pipe portion of the adjacent carbonization chamber is a water seal valve. Method of controlling pressure in furnace carbonization chamber.