JP2002265950A - Coke dry-quenching method and apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coke dry-quenching method and apparatus whereby the deposition of clinker is prevented even when air is blown into a prechamber; a preferable method and apparatus for spraying water and blowing air into the prechamber; and a preferable method and apparatus for measuring the inside temperature of the prechamber to keep its inside at a predetermined temperature or lower. SOLUTION: Air 24 is blown into a prechamber from its upper side, and simultaneously water 26 in the state of mist is sprayed thereinto by mixing the water into the air blown thereinto. A blow-in apparatus 42 has a two-port water spray nozzle 38 arranged above and below an air blow-in pipe, and the nozzle 38 sprays water in a wide angle in the horizontal direction and in a narrow angle in the vertical direction. The surface temperature of coke just below the outlet of the prechamber is measured with a non-contact type optical thermometer 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coke dry extinguishing method and a fire extinguishing apparatus.

[0002]

2. Description of the Related Art In cooling red hot coke discharged from a coke oven, a coke dry fire extinguisher (so-called CDQ (Coke Dry Quencher)) is used to recover sensible heat of the red hot coke and save energy.

The dry fire extinguisher has a cooling chamber for exchanging the sensible heat of the red hot coke into an inert gas, and a pre-chamber above the cooling chamber. Red hot coke is charged into the pre-chamber from above the pre-chamber. The pre-chamber is provided for the purpose of absorbing the time fluctuation of the input of the red hot coke and obtaining the stability of the operation. The coke is exchanged with an inert gas in a cooling chamber and cooled to a temperature close to 200 ° C., and is then cut out in fixed amounts. 90 after heat exchange
The inert gas heated to 0 ° C. is discharged from the upper part of the cooling chamber to a ring duct, passes through a primary dust catcher, is recovered by a waste heat boiler, and is again sent to the cooling chamber by a circulation blower.

[0004] The coke charged contains volatiles and fine coke. Volatile components are highly flammable and may be abnormally burned if contained in a high proportion in the circulating gas. Therefore, when air is blown into the pre-chamber, volatile matter and fine coke remaining in the coke mass can be burned. The blown air may burn part of the surface layer of red hot coke. As a result, the amount of heat of the gas discharged from the cooling chamber can be increased by mixing the hot air and the combustion exhaust gas with the inert gas.
Further, since the temperature of coke reaching the cooling chamber via the pre-chamber is also increasing, the amount of heat recovered by the inert gas in the cooling chamber also increases. As a result, the amount of recovered steam in the waste heat boiler can be increased.

[0005] By blowing air into the pre-chamber, the amount of heat recovery in the waste heat boiler can be increased in the steady-state operation of the dry fire extinguishing system, and
Even if the coke temperature in the cooling room decreases due to a decrease in the supply amount of red hot coke or a decrease in the temperature of the charged red hot coke, the amount of heat recovery in the waste heat boiler can be maintained constant. Will be possible. JP-A-61-3
No. 7893 discloses a method of blowing air into a pre-chamber.

In a dry fire extinguishing system, a gas containing water is supplied into a pre-chamber, and a gas containing a large amount of carbon monoxide and hydrogen gas is generated by a reaction with red hot coke.
A method in which this gas is combined with the circulating gas in the digestion tower is described in JP-A-59-75981.
The carbon monoxide and hydrogen gas recovered as gas components in the circulating gas are recovered as fuel gas after passing through the boiler, and air is added to the gas duct to burn carbon monoxide and hydrogen, and then boiled. It can also be recovered as steam.

[0007]

By blowing air into the pre-chamber and burning a part of the residual volatile matter, fine coke and lump coke, the temperature of both the blown air and the coke in the pre-chamber rises. . When the temperature in the pre-chamber reaches about 1400 ° C., the ash contained in the coke is melted and vaporized, and the vaporized ash is carried together with the air and mixed with the inert gas rising in the cooling chamber. The cooling gas outlet temperature of the inert gas is 90
At around 0 ° C., the vaporized ash aggregates and adheres to the sloping flue at the top of the cooling chamber. This deposit is called clinker, and has a problem that it blocks the gas ventilation holes, increases gas flow resistance, and inhibits circulation of the high-temperature coke cooling gas.

The present invention is intended to improve the safety by injecting air into the pre-chamber to combustible gas and coke breeze, etc., and to increase the amount of waste heat recovered. An object of the present invention is to provide a coke dry-type fire extinguishing method and a fire extinguishing apparatus that do not cause adhesion of water.

[0009]

According to the present invention, water or steam is blown into the pre-chamber together with air. Water gas reaction when red hot coke and steam come into contact,
It is an endothermic reaction with the generation of hydrogen gas and carbon monoxide. When water is blown, an endothermic reaction when water evaporates is added to the endothermic reaction by the water gas reaction. Therefore, while the inside of the pre-chamber is heated by blowing air into the pre-chamber, an endothermic reaction occurs by blowing water or steam into the pre-chamber, and as a result, the temperature in the pre-chamber can be maintained at a certain temperature or less. It becomes possible. Specifically, by controlling the temperature in the pre-chamber to 1150 ° C. or less, it is possible to prevent the ash from melting and vaporizing in the pre-chamber and prevent the clinker from adhering to the gas circulation system. It becomes possible.

The first feature of the present invention is that when air and water are blown into the pre-chamber, a preferred method and apparatus for blowing water and air are provided. A second feature of the present invention is that a preferable method and apparatus for measuring the temperature in the pre-chamber when controlling the temperature in the pre-chamber to a predetermined temperature or less by blowing water or steam together with air into the pre-chamber.

That is, the gist of the present invention is as follows. (1) A fire extinguisher tower 1 composed of a cooling chamber 2 and a pre-chamber 3 above the cooling chamber 2. A red-hot coke 9 is charged from above the pre-chamber, air is blown into the pre-chamber from above the pre-chamber, and In the coke dry quenching method in which the sensible heat of the red hot coke is blown in the cooling chamber using an inert gas as a medium and heat is recovered in the form of steam, the water 26 blown into the pre-chamber is blown. A coke dry fire extinguishing method characterized by spraying in a mist, mixing the mist of water with air 24 blown into a pre-chamber, and blowing the mixture. (2) There are two or more blowing ports 41 for blowing air and water into the pre-chamber in the circumferential direction of the pre-chamber, and a pre-chamber circumferential direction angle θ between adjacent blowing ports is arranged in the following range. The coke dry extinguishing method according to the above (1), characterized in that: 0.5 × (360 / N) ≦ θ (°) ≦ 1.5 × (360
/ N) where θ is the angle in the circumferential direction of the pre-chamber between adjacent blowing ports, and N is the number of blowing ports. (3) The above (1) or (2), wherein the height position of the blowing port 41 for blowing air and water into the pre-chamber is higher than a predetermined upper limit of coke loading in the pre-chamber. ) Dry fire extinguishing method for coke described in (1). (4) The upper end of the coke loaded in the pre-chamber
When exceeding the predetermined coke loading upper limit position, the blowing of air and water into the pre-chamber is interrupted or the blowing amount is reduced, and the upper end of the coke falls below the upper limit position or the predetermined designated position. The coke dry extinguishing method according to the above (3), wherein the blowing of water and air is restarted or the blowing amount is increased. (5) It has a fire extinguisher tower 1 composed of a cooling chamber 2 and a pre-chamber 3 above the same. Red hot coke 9 is charged from above the pre-chamber, and air or water is blown into the pre-chamber from above the pre-chamber. In a coke dry quenching method in which steam is blown, heat exchange of the sensible heat of the red hot coke in a cooling chamber using an inert gas as a medium, and heat recovery in the form of steam, the surface temperature of the coke immediately below the outlet of the pre-chamber Is measured by a non-contact optical thermometer 18, and the measured temperature is used as the temperature in the pre-chamber to perform operation management or control. (6) Water or steam is blown at the same time as air is blown into the pre-chamber from the upper part of the pre-chamber, and the blow-in amount of the water or steam or the pre-chamber is blown so that the temperature in the pre-chamber becomes equal to or lower than a predetermined temperature. The coke dry extinguishing method according to the above (5), wherein one or both of the air blowing amounts is adjusted.

(7) A fire extinguisher 1 comprising a cooling chamber 2 for exchanging the sensible heat of the red hot coke into an inert gas and a pre-chamber 3 above the cooling chamber, and the heat of the inert gas in the form of steam. A coke dry fire extinguisher having a waste heat boiler 7 to be recovered and a blowing device 42 for blowing air and water into the pre-chamber above the pre-chamber, wherein the blowing device 42 sprays water in mist. A coke dry fire extinguisher characterized by mixing with air and blowing into a pre-chamber. (8) The blowing device 42 has two water spray nozzles 38 vertically arranged in an air blowing pipe 43, and the water spray nozzles 38 have a wide angle in the horizontal direction and a narrow angle in the vertical direction. The coke dry-type fire extinguisher according to the above (7), wherein water is sprayed onto the coke. (9) The blowing device 41 has two or more blowing ports 41 in the circumferential direction of the pre-chamber, and a pre-chamber circumferential direction angle θ between adjacent blowing ports is arranged in the following range. The coke dry fire extinguisher according to the above (7) or (8). 0.5 × (360 / N) ≦ θ (°) ≦ 1.5 × (360
/ N) where θ is the angle in the circumferential direction of the pre-chamber between adjacent blowing ports, and N is the number of blowing ports. (10) Any one of the above (7) to (9), wherein the position of the blowing port 41 of the blowing device 42 in the height direction is higher than a predetermined coke loading upper limit position in the pre-chamber. A dry coke fire extinguisher according to item 1. (11) A cooling chamber 2 for exchanging the sensible heat of the red hot coke into an inert gas and a pre-chamber 3 above the cooling chamber
And a waste heat boiler 7 for recovering the heat of the inert gas in the form of steam, and a blowing device 42 for blowing air and water or steam into the pre-chamber above the pre-chamber. A non-contact optical thermometer 18 for measuring the surface temperature of coke immediately below the outlet of the pre-chamber, comprising:

[0013]

1 to 5 show an embodiment of the present invention.
It will be described based on. As shown in FIG. 1, a fire extinguisher tower 1 for cooling red hot coke is formed in a vertical shape, and includes a pre-chamber 3 and a cooling chamber 2 in a vertical direction. The pre-chamber 3 and the cooling chamber 2 are divided as a gas flow by a sloping flue portion 4 formed around the inner wall.

Red hot coke 9 having a temperature of about 980 ° C. is charged from above the pre-chamber 3 and moves gradually downward, and in the cooling chamber 2, the blowing pipe 11 at the lower part of the cooling chamber.
Is cooled by the inert gas 27 blown from the air.
The temperature of the coke 10 when discharged from the lower part of the cooling chamber is around 210 ° C.

The inert gas 27 blown in the cooling chamber exchanges heat with the red hot coke while rising in the cooling chamber, so that the gas temperature rises and the ring duct 4 from the sloping flue section 4 in the upper part of the cooling chamber. It is discharged to 5. Further, the inert gas is sent from the ring duct 5 through the primary dust catcher 6 to the waste heat boiler 7, where the heat is recovered by the waste heat boiler 7 and the temperature is reduced to about 180 ° C., and then cooled again through the circulation blower 8. It is blown into room 2.

In the present invention, air 24 is introduced into the pre-chamber from the air blowing device 14 above the pre-chamber.
Is blown. The oxygen in the blown air reacts with the remaining volatiles, fine coke and part of the lump coke. The reaction is an exothermic reaction that mainly produces carbon monoxide, and the blown air, product gas, and coke descend in the pre-chamber while increasing in temperature, and reach the highest temperature in the lower part of the pre-chamber.

The blown air and generated gas are mixed with an inert gas rising from below at the lower part of the pre-chamber, and are discharged from the sloping flue section 4 to the ring duct 5. Air 25 may be blown into the ring duct 5 or the gas discharge pipe 12 from the air blowing pipe 15.
Thereby, the carbon monoxide generated in the pre-chamber is burned to carbon dioxide.

In the present invention, the water blowing device 1
Due to 6, water 26 is blown into the pre-chamber from above the pre-chamber. Steam may be blown together with water from the water blowing device 16. The injected water absorbs heat when it evaporates into steam, and the steam comes into contact with red hot coke to generate hydrogen gas and carbon monoxide by a water gas reaction and absorb heat. Therefore, the temperature of the gas and coke in the pre-chamber is reduced by blowing water or steam, and the temperature of the gas and coke in the pre-chamber can be adjusted by adjusting the amount of water or steam blown.

The hydrogen gas and carbon monoxide generated by the water gas reaction descend in the pre-chamber, mix with the inert gas rising in the lower part of the pre-chamber, and are discharged from the sloping flue section 4 to the ring duct 5. When air 25 is blown into the ring duct 5 or the gas discharge pipe 12, the air 25 burns hydrogen gas and carbon monoxide to produce water and carbon dioxide. At the same time, the calorific value of the waste heat boiler supply gas 23 increases due to the combustion heat of the combustion.

As a result of blowing water or steam into the pre-chamber, the amount of heat supplied by the waste heat boiler supply gas 23 on the boiler inlet side increases as described above. Therefore, in the case of the present invention that blows water or steam,
It is also possible to reduce the amount of air blown into the pre-chamber while securing the required amount of heat in the waste heat boiler. That is, by controlling one or both of the amount of air blown into the pre-chamber and the amount of water or steam blown into the pre-chamber, the maximum temperature inside the pre-chamber and the gas amount and gas temperature of the waste heat boiler supply gas 23 are controlled. At the same time, it is possible to adjust to optimal conditions.

If the amount of heat obtained by the inert gas by cooling the red hot coke is high and the amount of heat to be supplied to the waste heat boiler can be sufficiently ensured, the pre-chamber is supplied without supplying water or steam from the pre-chamber. The temperature in the pre-chamber can be reduced only by reducing the blowing amount of the blowing air 24.

Ash in coke powder was conventionally considered to melt at 1400 ° C. or higher, but as a result of many tests, it was found that it softened and melted at about 1200 ° C. Particularly in the case of a multi-component system, the softening temperature tends to decrease, and the radius is about 10 m.
Considering the temperature variation in the cross section of the pre-chamber,
It has been found that a temperature of 1150 ° C. can be a major operational criterion. It is effective to manage at lower temperature in consideration of safety from the viewpoint of long-term stable operation.

In the above (1) and (7) of the present invention, when the air 24 is blown into the pre-chamber at the same time as the water 26 is blown, the water 26 blown into the pre-chamber is sprayed in a mist state. Air into the pre-chamber
And a coke dry-type fire extinguishing method and apparatus. At the same time as blowing air and water into the pre-chamber, steam may also be blown.

The water 24 blown into the pre-chamber needs to be evenly sprayed on the surface of the red hot coke layer upper part 30 filled in the pre-chamber. Non-uniform spraying is disadvantageous in that the red hot coke in places where a large amount of water is sprayed is excessively cooled, while the temperature of the red hot coke in places where no water is spread is not sufficiently reduced. However, when water is sprayed on red hot coke close to the brick on the side wall of the pre-chamber for the purpose of spraying water evenly,
Water splashes on the bricks, causing damage to the bricks.

As described in the present invention, the water sprayed into the pre-chamber is atomized to prevent the water sprayed on the red hot coke from scattering on the bricks.
Further, by mixing and blowing the mist water into the air blown into the pre-chamber, the mist water can be diffused uniformly and widely, and can be uniformly dispersed on the surface of the red hot coke in the pre-chamber. However, mist-like water,
It does not mean a mist that does not contain any liquid droplets, but may contain small liquid droplets as long as it is mist-like water that can be obtained with a commonly used flat spray nozzle.

In the above (8) of the present invention, as shown in FIG. 2, the blowing device 42 for spraying water in a mist state, mixing it with air, and blowing it into the pre-chamber includes an air blowing pipe 4
2, two water spray nozzles (38a, 3
8b), wherein the water spray nozzle is, as shown in FIG.
Water is sprayed at a wide angle in the horizontal direction and at a narrow angle in the vertical direction. In FIG. 3, reference numeral 39 denotes a trajectory of spray water, and reference numeral 40 denotes a spray water spray range.

Of the two water spray nozzles arranged vertically, the upper nozzle 38a adjusts the spray speed and the spray angle so that the water reaches a long distance, and mainly adjusts the spray angle and the spray angle in the pre-chamber. Spray water on the glowing coke surface farther from the blower. Nozzle 38 located below
b adjusts the spray speed and the spray angle so that the water reaches a short distance, and sprays water mainly on the surface of the red-hot coke near the blowing device in the pre-chamber. By arranging the two upper and lower blowing ports in this way, as shown in FIG. 4A, it is possible to spray water uniformly from the side closer to the blowing apparatus in the pre-chamber to the side farther away. In the gas flow in the coke layer of the pre-chamber, more gas flows near the pre-chamber wall than in the center of the pre-chamber. The path closer to the sloping flute is shorter near the pre-chamber wall,
This is because the airflow resistance in the coke layer is small. Therefore, even in the space 31 above the pre-chamber, a large amount of gas flows toward the vicinity of the pre-chamber wall, so that the spray water that has been blown further diffuses in the circumferential direction, and the spray water sprays over the entire surface of the coke layer upper part 30. Will be pervasive. It should be noted that two or more blowing devices of the present invention can be arranged in circumferentially different positions in the pre-chamber. In this case, the range that one blower should cover is
What is necessary is to cover not only the entire distance of the diameter of the pre-chamber but also the area from the vicinity of the blowing device to the center of the pre-chamber.

Since the water spray nozzle sprays water at a wide angle in the horizontal direction, as shown in FIG. 4B, water is sprayed on the surface of the red hot coke over the entire width of the pre-chamber extending to the left and right of the blowing port. be able to. On the other hand, the water spray nozzle sprays water in a substantially horizontal direction. In this case, even if the vertical spray angle of the water spray nozzle is a narrow angle, the water can be sprayed by sufficiently covering the half width of the pre-chamber, which is the range covered by the nozzle.

Since the water spray nozzle 38 is disposed in the air blowing pipe 43, the mist water is carried by the high-speed air flow, and the mist water reaches the far side from the blowing device 42 in the pre-chamber. can do.

In the above (2) and (9) of the present invention, the blowing device 41 for blowing air and water into the pre-chamber 3 has at least two blowing ports 41 in the circumferential direction of the pre-chamber, and the space between adjacent blowing ports is provided. Is set in the following range. 0.5 × (360 / N) ≦ θ (°) ≦ 1.5 × (360
/ N) where θ is the angle in the circumferential direction of the pre-chamber between adjacent blowing ports, and N is the number of blowing ports. For example, when the number of the blowing ports is two, 90 ° ≦ θ ≦ 270 °, and when the number of the blowing ports is three, 60 ° ≦ θ ≦ 180 °.

When θ is in the above-mentioned angle range, water can be uniformly sprayed on the surface of the red hot coke layer upper portion 30 in the pre-chamber without overlapping the blow-off ports 41. FIG.
(A) shows that the number N of the blowing ports 41 is 2 and the angle θ is 180.
In the case of °, FIG. 5B is a diagram showing the spray water spray range 40 when N is 3 and θ is 120 °.

The air and water or steam blown into the pre-chamber are located on the upper part 3 of the red hot coke layer in the pre-chamber.
It is preferable to blow air into the space 31 formed by the surface of the red hot coke layer and the pre-chamber. When air and water or steam are blown into the red hot coke layer 32, the reaction proceeds only in the coke near the blown gas, the gas becomes non-uniform, and the temperature distribution and the reactivity within the pre-chamber cross section are reduced. This is because variation occurs. Further, the air and water or steam bounced from the coke layer are locally applied to the brick near the blowing port, causing damage to the brick due to local cooling.

The discharge amount of coke 10 discharged from the cooling chamber has little variation over time, whereas the red hot coke 9 charged in the pre-chamber is charged in large quantities at one time, and thereafter charging may be interrupted. . Therefore, the surface position of the red hot coke layer upper portion 30 in the pre-chamber changes every moment. The height position of the air and water blowing ports 41 blown from the upper part of the pre-chamber of the present invention is higher than the predetermined coke loading upper limit position in the pre-chamber as described in the above (3) and (10) of the present invention. It is preferable to set it upward. Thereby, even if the amount of coke loaded in the pre-chamber changes with time, the air and water blowing ports 41 can always be located above the glowing coke layer.

When the charging speed of the red hot coke temporarily exceeds the coke discharging speed from the cooling chamber, the upper end of the red hot coke in the pre-chamber may exceed the upper limit of the coke loading. There is. In such a case, as in the above (4) of the present invention, when the upper end of the coke loaded in the pre-chamber exceeds the predetermined coke loading upper limit position, the air and the It is preferable that the blowing of water is interrupted or the blowing amount is reduced, and the blowing of water and air is restarted or the blowing amount is increased when the upper end of the coke falls below the upper limit position or a predetermined designated position. By performing such control, it is possible to avoid a disadvantage that air and water are directly blown into the red hot coke layer and the gas is not uniformly dispersed. As a method for detecting the upper end position of coke in the pre-chamber, a calculation method based on the amount of coke input and the amount of coke discharge based on the calibration of the pre-chamber level meter can be employed.

In controlling the temperature in the pre-chamber to a certain temperature or lower by blowing water or steam together with air into the pre-chamber, it is necessary to measure the temperature in the pre-chamber. The measured temperature in the pre-chamber is sent to the blowing control device 17 and the blowing control device 1
Reference numeral 7 controls the amount of water or steam 16 or air 24 blown so that the temperature in the pre-chamber becomes the target temperature.

As a method of measuring the temperature in the pre-chamber,
A method of measuring the ambient temperature or coke temperature near the inside of the inner cylinder brick by inserting a thermometer through the wall from outside to the pre-chamber part, the inner cylinder brick temperature or ambient temperature with the thermometer inserted in the inner cylinder brick And a method of measuring the temperature of the brick near the lower part of the pre-chamber with a thermocouple thermometer. However, in each of these methods, it is necessary to install a thermometer such as a thermocouple through the lower part of the brick or pre-chamber, the life of the thermometer is short, and it is necessary to replace it every time the thermometer deteriorates. Had occurred.

In the sloping flue section 4 located in the middle of the fire extinguishing tower, a ring duct 5 for discharging high-temperature gas from which sensible heat has been recovered is provided. When the ring duct 5 is observed from the sloping flue portion side, the red hot coke can be directly observed through the opening of the ring duct 5. The present inventors measured the temperature of the red hot coke immediately below the pre-chamber observed through the opening of the ring duct 5 with a non-contact optical thermometer 18, and found that the measured temperature of the red hot coke was the temperature inside the pre-chamber. Can be used for temperature control in the pre-chamber,
It has been found that the temperature in the pre-chamber can be kept constant with sufficient accuracy.

The above (5), (6) and (11) of the present invention have been made based on the above findings. That is, (1)
As described in 1), a non-contact optical thermometer 18 for measuring the surface temperature of coke immediately below the pre-chamber outlet is arranged, and the temperature is measured with this thermometer as described in (5) above. The operation management or control is performed using the measured temperature as the temperature in the pre-chamber. Further, as described in (6) above, using the surface temperature of the coke immediately below the pre-chamber outlet measured by the non-contact optical thermometer 18, air is blown into the pre-chamber from the upper part of the pre-chamber and water is simultaneously discharged. Alternatively, steam is blown, and one or both of the blowing amount of the water or steam and the blowing amount of the pre-chamber blowing air are adjusted so that the temperature in the pre-chamber becomes equal to or lower than a predetermined temperature. Unlike conventional thermocouple thermometers, the durability of the thermometer has been greatly improved, and the frequency of replacing the thermometer has been greatly reduced. In the case of a thermometer failure, unlike the thermocouple thermometer which is installed through the brick, it is sufficient to only repair or replace the optical thermometer 18 installed in the space of the sloping flue section 4, so that repair and inspection are required. The load can be significantly reduced. As the non-contact optical thermometer 18, a radiation thermometer, a two-color pyrometer, or the like can be used.

Since the air 24 blows into the pre-chamber and the water and steam 26 blow into the pre-chamber, the amount of the circulating gas 37 circulating between the fire extinguisher 1 and the waste heat boiler 7 increases. Therefore, in order to keep the amount of the circulating gas constant, it is necessary to disperse a part of the circulating gas to the outside as the dissipating gas 33. If the circulating gas contains unburned gases such as carbon monoxide and hydrogen, the energy of these unburned gases cannot be effectively recovered. Therefore, the unburned gas contained in the circulating gas is converted into thermal energy by injecting air and burning, so that at least when the circulating gas passes through the waste heat boiler, the unburned gas is not contained in the circulating gas. Is preferable.
As shown in FIG. 1, the air blowing 25 may be recovered from the fire extinguishing tower 1 and blown into the gas directed to the waste heat boiler 7 from the air blowing device 14. As a result, carbon monoxide and hydrogen generated by the reaction of the air, water and steam blown into the pre-chamber with the red hot coke are all burned by the air 25 blown into the circulating gas to generate heat when carbon dioxide and water are formed. Then, energy can be effectively recovered as steam by the waste heat boiler 7.

[0040]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is applied to a coke dry fire extinguishing apparatus shown in FIG. The cooling chamber 2 of the dry fire extinguisher has an internal volume of 60
0 m ³ , and the pre-chamber 3 has an internal volume of 300 m ³ . Red hot coke 9 having an average temperature of 980 ° C. was cooled at an average discharge of 170 tons / H.

As the blowing device 42 for blowing air and water into the pre-chamber at the same time, one having the form shown in FIG. 2 was used, and two such devices were arranged in the pre-chamber. The two blowing devices were arranged at θ = 180 ° in the circumferential direction.
Radiation thermometers were installed at two locations in the sloping flue as temperature measuring means in the pre-chamber, and the temperature of red hot coke observed through the ring duct was measured in a non-contact manner. And the temperature in the pre-chamber. Two radiation thermometers,
90 with the boiler side at 0 ° in the circumferential direction of the ring duct
° and 270 °.

The upper limit of the amount of coke loaded in the pre-chamber was set to 120 tons, and the specified loading value was set to 110 tons. The blowing device 42 was installed 1 m above the coke surface at the upper limit of the coke loading.

The target temperature in the pre-chamber is set to 1000 ° C.
In order to keep the amount of steam generated in the waste heat boiler 7 constant, the amount of the pre-chamber blown air 24 is varied in the range of 5,000 to 30,000 Nm ³ / h according to the fluctuation of the coke discharge. In order to maintain the temperature inside the pre-chamber at a target, the amount of 0.26 is set to 0.2.
It was varied in the range of 5 to 2.5 t / h.

As a result, the actual temperature in the pre-chamber was controlled within the range of 1000 ± 20 ° C., and there was no adhesion of foreign matter to the sloping flue portion. Further, no damage to the brick due to splashing of water to the pre-chamber brick was observed, and no damage to the brick due to local cooling of the pre-chamber brick was observed. A non-contact thermometer using a radiation thermometer stably operated for a long time.

[0045]

According to the present invention, in the method and apparatus for extinguishing coke dry water, the water blown into the pre-chamber is atomized to prevent the water sprayed on the red hot coke from scattering on the bricks. Further, by mixing and blowing the mist water into the air blown into the pre-chamber, the mist water can be diffused uniformly and widely, and can be uniformly spread on the surface of the red hot coke in the pre-chamber.

According to the present invention, the durability of the thermometer is greatly improved by measuring the temperature of the red hot coke observed through the opening of the ring duct with a non-contact optical thermometer, and the thermometer is replaced. Frequency was overwhelmingly reduced. In the case of a thermometer failure, the load of repair and inspection can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a coke dry fire extinguisher according to the present invention.

FIG. 2 is a partial sectional view showing an air and water blowing device of the present invention.

FIG. 3 is a perspective view showing a spray state of a water spray nozzle of the present invention.

FIG. 4 is a view showing a spray state of spray water of the present invention;
(A) is the trajectory of the spray water in the cross section of the pre-chamber,
(B) is a figure which shows the spray water spray range on the red hot coke upper surface.

FIG. 5 is a view showing a spray water spray range on the upper surface of red hot coke in a case where a plurality of blowout ports of the present invention are provided, (a) showing two blowout ports, and (b) showing three blowout ports. Is the case.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fire tower 2 Cooling room 3 Pre-chamber 4 Sloping flue part 5 Ring duct 6 Primary dust catcher 7 Waste heat boiler 8 Circulation blower 9 Red hot coke 10 Exhaust coke 11 Inert gas blowing pipe 12 Gas exhaust pipe 13 Waste heat boiler gas supply Tube 14 air blowing device 15 air blowing device 16 water blowing device 17 blowing control device 18 non-contact optical thermometer 19 bypass pipe 20 inner cylinder 21 blowing gas 22 exhaust gas 23 waste heat boiler supply gas 24 pre-chamber blowing air 25 Ring duct blowing air 26 Pre-chamber blowing water 27 Inert gas flow 28 Air flow 29 Bypass gas 30 Upper part of red hot coke layer 31 Space 32 Red hot coke layer 33 Dissipated gas 34 Water supply 35 Generated steam 36 Secondary dust dust Tcha 37 circulating gas 38 of water spray nozzles 39 spray water path 40 sprayed water spray range 41 blowing inlet 42 injectors 43 air inlet tube

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Atsushi Suzuki, Inventor 20-1 Shintomi, Futtsu-shi Nippon Steel Corporation Technology Development Division F-term (reference) 4H012 DA02 DA09 DA11 EA02

Claims (11)

[Claims] 1. A fire extinguishing tower comprising a cooling chamber and a prechamber above the cooling chamber, charging red-hot coke from above the prechamber, blowing air into the prechamber from the upper prechamber and simultaneously blowing water therewith, In the coke dry fire extinguishing method, in which the sensible heat of the red hot coke is heat-exchanged in the cooling chamber using an inert gas as a medium and heat is recovered in the form of steam, the water blown into the pre-chamber is atomized. Mixing the mist of water with air to be blown into a pre-chamber and blowing it. 2. The pre-chamber has two or more air inlets for blowing air and water in the circumferential direction of the pre-chamber, and a pre-chamber circumferential angle θ between the adjacent air inlets is set in the following range. The coke dry extinguishing method according to claim 1, wherein 0.5 × (360 / N) ≦ θ (°) ≦ 1.5 × (360
/ N) where θ is the angle in the circumferential direction of the pre-chamber between adjacent blowing ports, and N is the number of blowing ports. 3. The pre-chamber according to claim 1, wherein a height position of a blowing port for blowing air and water into the pre-chamber is higher than a predetermined coke loading upper limit position in the pre-chamber. The described coke dry-extinguishing method. 4. When the upper end of the coke loaded in the pre-chamber exceeds the predetermined coke loading upper limit position, the blowing of air and water into the pre-chamber is interrupted or the blowing amount is reduced. 4. The coke dry fire extinguishing method according to claim 3, wherein when the upper end of the coke falls below the upper limit position or a predetermined designated position, the blowing of water and air is restarted or the blowing amount is increased. 5. A fire extinguishing tower comprising a cooling chamber and a pre-chamber above the cooling chamber, charging red-hot coke from above the pre-chamber, blowing air into the pre-chamber from above the pre-chamber, and simultaneously discharging water or steam. In the coke dry fire extinguishing method, wherein the sensible heat of the red hot coke is blown and heat exchanged in a cooling chamber using an inert gas as a medium, and heat is recovered in the form of steam, the surface temperature of the coke immediately below the outlet of the pre-chamber is controlled. A coke dry fire extinguishing method characterized by measuring with a contact-type optical thermometer and performing operation management or control using the measured temperature as a temperature in a pre-chamber. 6. Water or steam is blown at the same time as air is blown into the pre-chamber from the upper part of the pre-chamber, and the water or steam blowing amount or pre-blow is controlled so that the temperature in the pre-chamber is lower than a predetermined temperature. The coke dry fire extinguishing method according to claim 5, wherein one or both of the blowing amount of the air blown into the chamber is adjusted. 7. A cooling chamber for exchanging the sensible heat of the red hot coke with an inert gas and a fire extinguisher tower comprising a prechamber above the cooling chamber, and a waste heat for recovering the heat of the inert gas in the form of steam. A coke dry fire extinguisher having a boiler and a blowing device for blowing air and water into the pre-chamber, wherein the blowing device sprays water in a mist and mixes the air with the air. A coke dry fire extinguisher characterized by being blown into the chamber. 8. The blowing device has two water spray nozzles vertically arranged in an air blowing pipe, and the water spray nozzles are configured to spray water at a wide angle in the horizontal direction and at a narrow angle in the vertical direction. The coke dry fire extinguisher according to claim 7, wherein the coke is sprayed. 9. The pre-chamber has two or more blowing ports in the circumferential direction of the pre-chamber, and a pre-chamber circumferential direction angle θ between adjacent blowing ports is set in the following range. The coke dry fire extinguisher according to claim 7 or 8, wherein 0.5 × (360 / N) ≦ θ (°) ≦ 1.5 × (360
/ N) where θ is the angle in the circumferential direction of the pre-chamber between adjacent blowing ports, and N is the number of blowing ports. 10. The blower according to claim 7, wherein the position of the blower in the height direction is higher than a predetermined upper limit of coke loading in the pre-chamber.
A dry coke fire extinguisher according to any one of claims 1 to 9. 11. A cooling tower for exchanging sensible heat of red hot coke with an inert gas and a fire extinguishing tower comprising a pre-chamber above the cooling chamber, and a waste heat for recovering heat of the inert gas in the form of steam. In a coke dry fire extinguisher having a boiler and a blowing device for blowing air and water or steam into the pre-chamber, a non-contact type for measuring the surface temperature of coke immediately below the pre-chamber outlet A coke dry-type fire extinguisher characterized by having an optical thermometer as described above.