WO2004022672A1 - Procede et systeme de refroidissement de coke - Google Patents

Procede et systeme de refroidissement de coke Download PDF

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Publication number
WO2004022672A1
WO2004022672A1 PCT/JP2002/008755 JP0208755W WO2004022672A1 WO 2004022672 A1 WO2004022672 A1 WO 2004022672A1 JP 0208755 W JP0208755 W JP 0208755W WO 2004022672 A1 WO2004022672 A1 WO 2004022672A1
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WO
WIPO (PCT)
Prior art keywords
air
amount
gas
steam
water
Prior art date
Application number
PCT/JP2002/008755
Other languages
English (en)
Japanese (ja)
Inventor
Atsushi Suzuki
Yasutaka Shihara
Masahiko Yokomizo
Original Assignee
Nippon Steel Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corporation filed Critical Nippon Steel Corporation
Priority to PCT/JP2002/008755 priority Critical patent/WO2004022672A1/fr
Priority to CN028298217A priority patent/CN1694943B/zh
Publication of WO2004022672A1 publication Critical patent/WO2004022672A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B39/00—Cooling or quenching coke
    • C10B39/02—Dry cooling outside the oven
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines

Definitions

  • the present invention relates to a coke dry extinguishing method and a fire extinguishing apparatus.
  • a kotus dry-type fire extinguisher (so-called CDQ (Coke Dry Quencher)) is used to recover the sensible heat of the red-hot coas and save energy.
  • CDQ Coke Dry Quencher
  • the pre-champer is provided for the purpose of absorbing the time fluctuation of the input of red hot coater and obtaining the stability of operation.
  • the coatus is cooled to around 200 ° C by exchanging heat with the inert gas in the cooling room, and then cut into fixed amounts. After the heat exchange, the inert gas heated to 900 ° C is discharged from the upper part of the cooling chamber to the ring duct, passes through the primary dust catcher, is recovered by the waste heat boiler, and is cooled again by the circulation port It is pumped to the room.
  • the charged cortasse contains volatiles-fine coke. Volatile components are highly flammable, and if contained in a high proportion in the circulating gas, abnormal combustion may occur. Therefore, when air is blown into the pre-chamber, the volatile matter remaining in the chute mass / the fine coke is burned. be able to.
  • the blown air may burn part of the surface of the glow coat.
  • 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.
  • the amount of heat recovered in the waste heat boiler can be increased in the steady-state operation of dry-type fire extinguishing equipment, and the amount of red hot coater supplied decreases or red heat is introduced. Even if the temperature of the coas in the cooling room decreases due to a decrease in the temperature of coke, the amount of heat recovered by the waste heat boiler can be kept constant.
  • Japanese Patent Application Laid-Open No. 61-37893 discloses a method of blowing air into a pre-chamber.
  • a gas containing water is supplied into the pre-chamber and a gas containing a large amount of carbon monoxide and hydrogen gas is generated by the reaction with the red hot coater, and this gas is combined with the circulating gas in the fire extinguishing tower.
  • This method is described in JP-A-59-75981.
  • 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. According to the company, it can be recovered as steam by a boiler.
  • the circulating gas contains unburned gases such as carbon monoxide and hydrogen, the energy of these unburned gases cannot be effectively recovered.
  • the unburned gas contained in the circulating gas is converted into thermal energy by blowing air and burning, and at least when the circulating gas passes through the waste heat boiler, the unburned gas is contained in the circulating gas. It is preferable not to be.
  • the circulating gas contains oxygen, it is not preferable in that the coater burns in the cooling chamber and the cooling capacity is reduced. Therefore, when blowing air into the circulating gas recovered from the fire extinguisher tower, it is necessary to take care that excessive oxygen is blown so that no oxygen remains in the circulating gas.
  • the temperature of both the injected air and the coats in the pre-champ rises. And When the temperature inside the rechamper reaches about 1400 ° C, the ash contained in the coke is melted and vaporized, and the vaporized ash is carried with the air and mixed with the inert gas rising in the cooling chamber.
  • the temperature of the cooling gas outlet of the inert gas is around 900 ° C, and the vaporized ash agglomerates and adheres to the sloping free part at the top of the cooling room.
  • These deposits are called “cleaners” and have the problem that they block the gas ventilation holes, increase the gas ventilation resistance, and impede the circulation of the high-temperature coke cooling gas.
  • the temperature of the gas supplied to the waste heat boiler must be varied.Boiler tubes that constitute the waste heat boiler have an upper limit operating temperature that is determined by the material and structure. The temperature of the waste gas supplied to the waste heat boiler must be lower than that temperature, since using it at a temperature higher than that may cause thermal damage.
  • High-temperature exhaust gas discharged from the fire extinguisher tower is supplied to the waste heat boiler through the sloping flute section, but if the amount of this exhaust gas exceeds the upper limit flow rate, the floating and scattering phenomenon of the coater from the slop pin flute section will occur. It is necessary to control the flow at a certain flow rate or less, since this will cause a sudden increase in the circulation gas ventilation resistance and lead to troubles such as wear and tear of the boiler tube due to the scattering flow.
  • the second objective is to provide a fire extinguishing method that always keeps the flammable gas component and oxygen component in the circulating gas at the minimum value, and always keeps the temperature inside the pre-chamber below a certain temperature.
  • the third objective is to prevent foreign matter from adhering to the low pindle flutes, always keeping the temperature of the gas supplied to the waste heat boiler within a certain range to prevent heat damage to the boiler tubes, and at the same time to recover the heat in the boiler
  • the fourth objective is to prevent a decrease in efficiency, and keep the amount of exhaust gas discharged from the fire extinguisher tower constant at a constant flow rate to cause coke floating and scattering from the slapping tower.
  • the present invention improves the safety by injecting air into the pre-chamber ⁇ to combustible gas and coke breeze, and at the same time, increases the waste heat recovery as described above. It is a sixth object of the present invention to provide a dry fire extinguishing method and a fire extinguisher that do not cause excessive clunker attachment.
  • Fire tower 1 consisting of cooling room 2 and precyanper 3 above it
  • a red-hot coater 9 is inserted from above the pre-chamber, air and air or water or steam are blown into the pre-chamber 3 to heat the sensible heat of the red-hot coke in the cooling chamber using an inert gas as a medium.
  • the air and / or water blown into the pre-chamber 13 so that the heat input to the waste heat boiler 7 becomes a target value.
  • Coke dry extinguishing method characterized by adjusting the amount of steam
  • PC water 'steam 26 The amount of water or steam to be blown into the pre-champer (hereinafter referred to as “PC water 'steam 26”) and the air to be blown into the pre-champer (hereinafter “PC water”).
  • PC Air 24 The coke dry extinguishing method described in (1) above, wherein the ratio of the adjustment amounts in (1) is determined so as to keep the temperature inside the pre-chamber constant.
  • Air is supplied to the high-temperature exhaust gas 22 discharged from the fire tower 1 before reaching the waste heat boiler (hereinafter referred to as “SF air 25”), and the heat input to the waste heat boiler is kept constant.
  • the amount of the PC air 24 and / or the PC water / steam 26 is adjusted so that the amount of the SF air 25 is adjusted, and the amount of the SF air 25 and the amount of the PC air 24 and the amount of Z or PC water are adjusted.
  • the adjustment of the amounts of the PC air 24, PC water / steam 26, and SF air 25 is performed by detecting a change in the amount of coke 10 discharged from the fire extinguishing tower 1 and changing the detected amount of coke discharged.
  • the adjustment of the amounts of the PC air 24, the PC water 'steam 26, and the SF air 25 is performed by detecting a change in the amount of circulating gas 37 and detecting a change in the amount of sensible heat recovery due to the detected change in the amount of circulating gas.
  • Air (SF air 25) is supplied to the high-temperature exhaust gas 22 discharged from the fire extinguisher until it reaches the waste heat boiler 7, and the amounts of the PC air 24 and PC water ⁇ ⁇ steam 26 are adjusted. And (3) detecting fluctuations in SF air amount and compensating for fluctuations in boiler heat input due to the detected fluctuations in SF air amount to adjust the heat input to the waste heat boiler to a target value. , (2), or the coke dry-extinguishing method described in any of (4) to (8)
  • a part of the gas discharged from the waste heat boiler 7 and supplied to the cooling chamber 2 is branched, and the branched gas (hereinafter referred to as “bypass gas 29”) is combined with the waste heat boiler supply gas, and the PC Adjustment of the amount of air 24, PC water, steam 26, and SF air 25 is performed by detecting fluctuations in the amount of blown gas 21 supplied to the cooling chamber, and detecting coke due to the detected fluctuations in the amount of blown gas 21 supplied to the cooling chamber.
  • the heat input to the waste heat boiler The coke dry-extinguishing method according to any one of the above (1) to (9), wherein the method is adjusted to be constant.
  • a fire extinguisher 1 consisting of a cooling chamber 2 and a pre-chamber 3 above it, charging red hot coke 9 from above the pre-champer, and converting sensible heat of the red hot coke into an inert gas in the cooling chamber.
  • Heat is exchanged as a medium, and air (SF air 25) is supplied to the high-temperature exhaust gas 22 discharged from the fire extinguishing tower 1 before reaching the waste heat boiler 7, and the waste heat boiler 7 generates heat in the form of steam.
  • the concentration of carbon monoxide or hydrogen in the gas circulating in the waste heat boiler 7 or the calorific value of the circulating gas due to these gas components becomes constant, and the oxygen concentration becomes below a certain concentration. Adjusting the amount of the SF air so as to obtain a dry fire extinguishing method.
  • the amount of the SF air 25 is adjusted by setting a target value for the concentration of carbon monoxide in the gas circulating in the waste heat boiler, and setting an upper limit value, a lower limit value, and a target value for the oxygen concentration in the gas.
  • the amount of SF air is adjusted so that the concentration of carbon monoxide becomes the target value, and the oxygen concentration exceeds the upper limit
  • the adjustment of the amount of SF air based on the concentration of carbon monoxide is interrupted to stop the oxygen concentration. Is adjusted to the target value so that the oxygen concentration falls below the target value or the lower limit, or the oxygen concentration falls below the target value or the lower limit, and the carbon monoxide concentration falls below the target value.
  • the amount of the SF air 25 is adjusted by setting a target value for the hydrogen concentration in the gas circulating through the waste heat boiler, setting an upper limit value, a lower limit value, and a target value for the oxygen concentration in the gas.
  • the amount of SF air is adjusted so that the concentration becomes the target value.
  • the adjustment of the amount of SF air based on the hydrogen concentration is interrupted so that the oxygen concentration becomes the target value.
  • the hydrogen concentration is adjusted.
  • the amount of SF air 25 is adjusted by multiplying the product of the concentration of carbon monoxide in the gas circulating in the waste heat boiler and the calorific value of carbon monoxide by the product of the concentration of hydrogen in the gas and the calorific value of hydrogen. And a target value is set for the heat value, and an upper limit value, a lower limit value, and a target value are set for the oxygen concentration in the gas, and the circulating gas heat value becomes the target value.
  • the oxygen concentration exceeds the upper limit, the adjustment of the SF air amount based on the circulating gas calorific value is interrupted, and the SF air is adjusted so that the oxygen concentration reaches the target value.
  • the adjustment of the amount of the SF air 25 is performed by detecting a change in the amount of discharge of the status 10 from the fire extinguishing tower 1 and detecting the change in the amount of discharge of the detected state in the gas circulating through the waste heat boiler.
  • the adjustment of the amount of the SF air 25 is performed by detecting a change in the amount of PC air 24 and the amount of Z or PC water / steam 26, and by changing the detected amount of PC air and / or PC water / steam.
  • Air (PC air 24) and / or Z or water or steam (PC water / steam 26) are blown into the pre-champer 3, and the carbon monoxide or hydrogen concentration or the circulating gas calorific value is blown.
  • the amount of SF air 25 the amount of PC air 24 and / or PC water / steam 26 is adjusted and the amount of PC air 24 and / or PC water
  • the ratio between the amount of increase in SF air 25 and the amount of increase in SF air 25 is determined so that the amount of heat input to the waste heat boiler 7 becomes constant, Dry fire extinguishing method.
  • the temperature in the pre-champer is measured, and when a difference occurs between the measured temperature in the pre-champer and the target value, the adjustment amount of the PC water / steam 26 and the adjustment amount of the PC air 24 are determined.
  • a SF air blowing device 15 that supplies air (SF air 25) to the high-temperature gas 22 discharged from the fire extinguisher tower 2 and a waste heat boiler for cooling
  • a bypass pipe 19 for branching a part of the gas to be supplied to the chamber as an inert gas, joining the branched gas (bypass gas 29) to the waste heat boiler supply gas, and
  • the merging position of the pipe pipe 19 is located upstream of the SF air inlet (anti-boiler side).
  • the above (1) to (6) and (11) of the present invention relate to feed pack control for maintaining a constant amount of waste heat boiler steam recovery. Further, the above (7) to (10) of the present invention relate to feedforward control for keeping the amount of recovered steam from the waste heat poiler constant against disturbance.
  • the above (12) to (15), (18), and (19) of the present invention relate to feed pack control for minimizing the contents of combustible components and oxygen in circulating gas.
  • the above (16) and (17) of the present invention relate to a feedforward control for minimizing the content of combustible components and oxygen in the circulating gas against disturbance.
  • the above (20) and (21) of the present invention relate to a feed pack control for keeping the amount of high-temperature gas discharged from the cooling chamber constant.
  • the above item (22) of the present invention relates to a feed pack control for keeping the temperature inside the pre-chamber constant.
  • the above (23) of the present invention relates to a coke dry-type fire extinguishing device for avoiding damage due to a local abnormal temperature rise of the sloping fur brick.
  • control to keep the temperature inside the pre-chamber at 1150 ° C or less By doing so, it is possible to prevent the ash from being melted and vaporized in the pre-chamber, and to prevent the adhesion of the clinker to the gas circulation system.
  • the first feature of the present invention is that when air and water are blown into the pre-chamber II, a preferable method and apparatus for blowing water and air are provided.
  • a second feature of the present invention is to have a preferable method and apparatus for measuring the temperature inside the pre-champer when controlling the temperature inside the pre-champer to a certain temperature or less by blowing water or steam together with air into the pre-champer. I do.
  • the gist of the present invention that achieves the sixth object is as follows.
  • 0 is the angle in the circumferential direction of the pre-champer between the adjacent blowing ports
  • N is the number of blowing ports.
  • a fire tower 1 consisting of a cooling chamber 2 and a pre-chamber 3 above it, charging red hot coke 9 from above the pre-chamber and blowing air into the pre-chamber from above the pre-chamber and water
  • a coke dry extinguishing method in which steam is blown, heat exchange of the sensible heat of the red hot coke in the cooling chamber using an inert gas as a medium, and heat recovery in the form of steam is performed.
  • a dry fire extinguishing method for a kotus comprising measuring the surface temperature of coke with a non-contact optical thermometer 18, and using the measured temperature as the temperature in the pre-chamber to perform operation management or control.
  • a fire extinguisher tower 1 consisting of a cooling chamber 2 for exchanging the sensible heat of the red hot coke to an inert gas and a precyanper 3 at the top of the cooling chamber; A waste heat boiler 7 for recovering the heat of the active gas in the form of steam; and a coaters dry fire extinguisher having a blowing device 46 for blowing air and water into the pre-chamber above the pre-chamber.
  • the blow-in device 46 is a coatus dry-type fire extinguisher characterized by spraying water in mist, mixing it with air, and blowing it into the pre-champer.
  • the blowing device 46 has two water spray nozzles 42 vertically arranged in an air blowing pipe 47, and the water spray nozzles 42 have a wide angle in the horizontal direction and a wide angle in the vertical direction. Spraying water at a narrow angle
  • the blowing device 45 has two or more blowing ports 45 in the circumferential direction of the pre-chamber, and a circumferential angle 0 of the pre-chamber between adjacent blowing ports is arranged in the following range.
  • 0 is the angle in the circumferential direction of the pre-chamber between the adjacent blowing ports
  • N is the number of blowing ports.
  • Fire tower 1 consisting of cooling chamber 2 for exchanging the sensible heat of red-hot coke into inert gas and precyanper 3 at the top of the cooling chamber, and waste to recover heat of inert gas in the form of steam
  • a coke dry-type fire extinguishing system having a heat boiler 7 and a blowing device 46 for blowing air, water or steam into the pre-chamber, the surface temperature of the coater immediately below the pre-chamber outlet is provided above the pre-chamber.
  • FIG. 1 is a schematic diagram of a coke dry-type fire extinguisher according to the present invention.
  • FIG. 2 is a block diagram showing an outline of the control of the present invention.
  • Fig. 2 (a) is a block diagram according to the invention of claim 1,
  • (b) is a block diagram according to the invention of claim 2,
  • (c) is the block diagram of the invention of claim 3. It is a block diagram concerned.
  • FIG. 3 is another block diagram showing an outline of the control of the present invention.
  • FIG. 4 is another block diagram showing an outline of the control of the present invention.
  • FIG. 4 (a) is a block diagram according to the invention of claim 12, (b) is a block diagram according to the invention of claim 16, and (c) is a block diagram according to the invention of claim 19.
  • FIG. 4 (a) is a block diagram according to the invention of claim 12, (b) is a block diagram according to the invention of claim 16, and (c) is a block diagram according to the invention of claim 19.
  • FIG. 5 is a schematic diagram of another coke dry fire extinguishing apparatus of the present invention.
  • FIG. 6 is a partial sectional view showing the air and water blowing device of the present invention.
  • FIG. 7 is a perspective view showing a water mist state of the water mist nozzle of the present invention.
  • FIG. 8 is a diagram showing a spray state of the spray water of the present invention.
  • Fig. 8 (a) is a diagram showing the trajectory of the spray water in the cross section of the pre-champer, and (b) is a diagram showing the spray range of the spray water on the upper surface of the glowing coat.
  • FIG. 9 is a diagram showing the range of water spray on the upper surface of the glowing water status when a plurality of blowing ports of the present invention are provided.
  • Fig. 9 (a) is a diagram showing the case where there are two blowing ports, and
  • (b) is a diagram showing the case where there are three blowing ports. [Best mode for carrying out the invention]
  • the fire extinguisher tower 1 that cools the red hot coatas is formed vertically, and has a pre-champer 1 and a cooling chamber 2 in the vertical direction.
  • the pre-champer 3 and the cooling chamber 2 are divided as a gas flow by a throw pin duffle section 4 formed around the inner wall thereof.
  • Red hot coke 9 having a temperature of about 980 ° C. is charged from above the pre-chamber 13 and moves gradually downward, and in the cooling chamber 2, the inert gas 27 is blown from the blowing pipe 11 at the lower part of the cooling chamber. Cools down. The temperature of coke 10 when discharged from the lower part of the cooling chamber is close to 200 ° C.
  • the inert gas 27 blown in the cooling chamber exchanges heat with the red hot coke while rising in the cooling chamber, and the gas temperature rises, and the ring duct 5 extends from the slow pin flute 4 at the top of the cooling chamber. It is discharged to Further, the inert gas is sent from the ring duct 5 to the waste heat boiler 7 through the primary dust catcher 16, where the heat is recovered by the waste heat boiler 7 and the temperature drops to around 180 ° C. After one eight, it is blown into the cooling chamber 2 again.
  • air is blown into the pre-chamber as required.
  • the air blown into the pre-chamber may be referred to as “PC air 24”.
  • the oxygen in the blown air reacts with the remaining volatiles, fines and some of the lumps.
  • the reaction is mainly an exothermic reaction that produces carbon monoxide, and the blown air, product gas, and coke descend in the pre-chamber while the temperature rises, and reach the highest temperature in the lower part of the pre-champer .
  • the blown air and product gas flow downward at the lower part of the pre-chamber. Mixed with the inert gas that has risen from the outlet, and is discharged to the ring duct 5 from the slopping fuse section 4.
  • water or steam is blown together with air into the pre-champer as needed.
  • the water or steam blown into the pre-chamber ⁇ may be referred to as “PC water / steam 26”.
  • the injected water absorbs heat when it evaporates to steam, and the steam comes into contact with the red-hot coat to generate hydrogen gas and carbon monoxide by the water gas reaction and absorb heat. Therefore, by blowing water or steam, the temperature of the gas and coke in the pre-chamber decreases, and by adjusting the amount of water or steam blown, the temperature of the gas and the coat in the pre-chamber can be adjusted.
  • Hydrogen gas and carbon monoxide generated by the water gas reaction descend in the pre-chamber, mix with the inert gas that has risen in the lower part of the pre-chamber, and are discharged from the part 4 of the slowing flute to the ring duct 5. Is done.
  • air 25 is blown into the ring duct 5 or the gas discharge pipe 12 of the slopping flute 4 (SF) as necessary.
  • this blown air is sometimes referred to as “SF air 25”.
  • the carbon monoxide generated by the reaction between PC air 24 and red hot coke 9 and the carbon monoxide and hydrogen generated by the reaction between PC water / steam 26 and red hot coke 9 are discharged from ring duct 5 to produce the above SF. Combustion occurs upon contact with air 25, and changes into carbon dioxide and water, generating heat.
  • a part of the gas discharged from the waste heat boiler 7 and supplied to the cooling chamber from the inert gas injection pipe 11 is branched into a bypass pipe 19, and the branched gas (hereinafter referred to as “the branched gas”).
  • the gas is combined with the exhaust gas 22 at the gas exhaust pipe 12 to obtain a waste heat boiler supply gas 23.
  • the required amount of gas 21 to be blown into the cooling chamber 2 is preferably blown as much as possible in order to maximize the amount of sensible heat recovery from the glowing coat in the cooling chamber 2, but on the other hand, fire extinguishing
  • the above (7) to (10) of the present invention relate to feedforward control for maintaining a constant amount of waste heat boiler vapor recovery against disturbance.
  • a force for blowing PC air, or both PC air and PC water / steam are blown from the pre-chamber.
  • PC air 24 increases the reaction with red hot coke 9 in the pre-chamber, and as a result, increases the steam recovery. Conversely, reducing the amount of PC air 24 blown reduces the amount of steam recovery.
  • the relationship between the fluctuations in the amount of PC air and the fluctuations in the amount of recovered steam is mainly determined by the amount of heat generated when carbon monoxide is generated by the reaction between the oxygen in the PC air and the coater. The burning amount of the volatile components contained in the glowing lime is added.
  • the relationship between the PC air volume fluctuation and the steam recovery fluctuation for each Cotus dry-type fire extinguishing system can be accurately determined based on actual operation data.
  • the relationship between the variation in the amount of PC water / steam 26 injected and the variation in the amount of recovered steam can also be accurately determined based on actual operation data.
  • the amount of heat input to the waste heat boiler is usually selected as the control amount.
  • the above (1) of the present invention is based on the above findings, and is based on the case where PC water and steam 26 are not blown so that the heat input to the waste heat boiler becomes the target value. Is adjusted by adjusting the amount of PC air 24 or, if the PC water / steam 26 is blown, by adjusting the amount of PC air 24 or PC water / steam 26. , Waste heat boiler Maintain a constant amount of steam generated.
  • Fig. 2 (a) shows a block diagram when only PC air 24 is adjusted.
  • the PC air amount is varied according to the degree of the difference, or the PC air amount and the PC water / steam
  • the amount of heat is increased or decreased by changing the amount of heat, and the amount of heat input to the waste heat boiler is made to match the target value. More specifically, good control can be performed by optimizing each parameter when performing PID control.
  • the temperature in the pre-chamber 3 becomes too high, the ash contained in the coke is melted and vaporized, and the ash that has been cooled and cooled near the outlet of the inert gas cooling chamber is agglomerated. Attached to part 4 of the slowing flute. Therefore, when increasing the PC air 24 in order to keep the steam recovery amount constant in the above (1), it is preferable that the temperature inside the pre-chamber can be kept constant so as not to become excessively high.
  • the temperature inside the pre-champer can be lowered by increasing the amount of PC water / steam blow.
  • the above (2) of the present invention is based on this finding, and in the control for keeping the amount of recovered steam constant, it is necessary to increase the amount of PC air and the amount of increase of PC water and steam. Is performed at a fixed ratio.
  • Figure 2 (b) shows the block diagram.
  • the constant ratio is determined based on experiments, etc., so that the rise in the temperature of the pre-chamber due to an increase in the amount of PC air and the fall in the temperature inside the pre-champer due to the increase in the amount of PC water vapor are determined.
  • feed pack control for keeping the heat input to the waste heat boiler constant while keeping the temperature inside the pre-chamber constant.
  • the amount of combustible gas increases, the amount of the increase will be sent to the waste heat boiler without burning, and energy cannot be sufficiently recovered.
  • the oxygen supplied from SF air 25 becomes excessive, and the gas containing oxygen is supplied to the waste heat boiler, and is finally contained in the blow-in gas 21 and cooled down. It will be supplied to
  • the ratio of the amount of adjustment of PC air and / or the amount of adjustment of PC water / steam to the amount of adjustment of SF air is determined by the concentration of combustible gas components and oxygen in the waste heat boiler supply gas. Is determined to be constant.
  • Figure 2 (c) shows the block diagram in this case.
  • the increase in PC air 24 increases the amount of carbon monoxide in the exhaust gas, and the amount of SF air 25 required to burn this increased carbon monoxide to carbon dioxide is almost the same as the increase in PC air 24 Is comparable to
  • the ratio between the adjustment amount of SF air 25 and the adjustment amount of PC air 24 so as not to increase or decrease the flammable gas components and oxygen in circulating gas 37. it can.
  • the ratio between the adjustment amount of SF air 25 and the adjustment amount of PC water / steam 26 can be similarly obtained.
  • the amount of the SF air 25 increases or decreases as the PC air 24 and / or the PC water vapor 26 increases or decreases.
  • the amount of gas combustion in the exhaust pipe 12 also changes, so the amount of heat input to the waste heat boiler also increases or decreases.
  • the heat input to the waste heat boiler becomes constant.
  • the amount of adjustment depends on the PC in the above (1) and (2) of the present invention. A small adjustment amount is sufficient compared to the adjustment amount of air, etc.
  • the temperature inside the pre-chamber is kept constant, and the combustible gas component and oxygen in the waste heat boiler supply gas are increased. Without this, it is possible to perform feed pack control to keep the heat input of the waste heat boiler constant.
  • the heat input of the waste heat boiler is usually selected as the control amount, and the heat input becomes constant.
  • the control is performed as follows. However, even if the control is performed so that the heat input of the waste heat boiler is constant, the amount of steam generated in the waste heat boiler 7 is not necessarily constant and may fluctuate.
  • the first reason that the steam generation amount fluctuates is that unburned components of combustible gas and oxygen remain in the boiler supply gas 23, and the unburned components burn in the boiler.
  • steam with energy equal to or greater than the heat input to the boiler was generated.
  • the residual oxygen is introduced by the air introduced as SF air 25 up to the boiler inlet. It is conceivable that the combustion was not completed and that the outside air entered the boiler body.
  • the above (4) of the present invention is based on the above knowledge, and is adjusted by changing the amount of heat input to the waste heat boiler and adjusting the amount of steam generated by the waste heat boiler to a target value. It is possible to maintain a constant amount of generated steam by suppressing fluctuations in the amount of generated steam.
  • the actual value of the amount of generated steam can be measured by installing a flow meter such as an orifice in the generated steam main pipe. It is also possible to estimate from the amount of pure water supplied to the waste heat poirer.
  • the amount of heat input to the waste heat boiler is changed so that the gas temperature at the waste heat boiler inlet is adjusted to a target value.
  • the value of the heat input of the boiler is to be obtained, the temperature, the amount and the specific heat of the gas at the inlet of the boiler are required, which complicates the measurement and lowers the accuracy.
  • the control can be performed by measuring only the temperature.
  • the amount of boiler inlet gas and the specific heat do not fluctuate significantly in a short time, by controlling the temperature to a constant value, the heat input will be controlled in a short term.
  • short-period feed pack control to keep the amount of generated steam constant is performed using the amount of heat input to the waste heat boiler as the control amount, and the relationship between the amount of generated steam and the amount of heat input to the boiler is determined over a long period.
  • Generated amount is the target value It is preferable to obtain the heat input amount that satisfies the condition below, and correct the waste heat boiler heat input target value or the waste heat boiler inlet gas temperature target value in the short cycle feedback control.
  • FIG. 3 (a) shows a block diagram of this case.
  • the change in the discharge amount of the coatas 10 from the fire extinguishing tower 1 is detected, and the detected discharge amount of the coatas 10 is calculated.
  • the fluctuation is regarded as a disturbance, and feedforward control is performed to keep the amount of generated steam constant.
  • the amount of cortus discharged from the fire tower 1 increases, the amount of recovered coke sensible heat also increases.
  • the increase in the amount of coke sensible heat recovery accompanying the increase in coke emissions can be estimated from heat calculations and can be accurately determined based on experiments.
  • Fig. 3 (b) shows a block diagram when PC air is selected as the manipulated variable. This figure also shows the feed pack control diagram.
  • the above (8) of the present invention focuses on the fluctuation of the amount of circulating gas as a disturbance, and performs feedforward control for keeping the amount of generated steam constant as in the above (7) of the present invention. .
  • the value obtained by subtracting the amount of the radiated gas from the amount of the circulating gas is the amount of the blowing gas supplied to the cooling chamber as it is.
  • the amount of blown gas supplied to the cooling chamber fluctuates, the heat exchange efficiency in the cooling chamber changes, and the amount of sensible heat that the cooling gas recovers from the red hot coatas fluctuates.
  • This fluctuation of the sensible heat recovery is predicted in advance based on heat calculation and experiments, and PC airflow is controlled by feedforward control so as to compensate for the fluctuation of the sensible heat recovery and maintain a constant heat input to the waste heat boiler.
  • PC water / steam 26 and SF air 25 to adjust one or more of the quantities.
  • the amount of blown gas supplied to the cooling chamber may be directly detected and used.
  • the above (9) of the present invention focuses on the fluctuation of the SF air amount as a disturbance, and adjusts the PC air, PC water and steam to keep the boiler heat input constant. It performs control.
  • the above (10) of the present invention focuses on the fluctuation of the flow rate of the blown gas supplied to the cooling chamber as disturbance when the bypass gas 19 is arranged and the bypass gas 29 flows, and is similar to the above (7) of the present invention.
  • feed-feed control is performed to keep the amount of generated steam constant.
  • the amount of the blowing gas supplied to the cooling chamber is the amount obtained by subtracting the amount of the bypass gas and the amount of the dissipated gas from the amount of the circulating gas.
  • the amount of blown gas supplied to the cooling chamber fluctuates, the heat exchange efficiency in the cooling chamber changes, and the amount of sensible heat that the cooling gas recovers from red hot coke fluctuates.
  • This fluctuation in the amount of sensible heat recovery is predicted in advance based on heat calculation and experiments, and PC air is controlled by feedforward control so as to compensate for the fluctuation in the amount of sensible heat recovery and keep the heat input to the waste heat boiler constant. 24, one or more of the amounts of PC water / steam 26 and SF air 25 are adjusted.
  • the amount of circulating gas and the amount of bypass gas are detected, and the difference The supplied blowing gas amount may be calculated and used.
  • the feed pack control and the feed feed control are performed while responding to the occurrence of various disturbances, so that the steam recovery amount in the waste heat boiler is kept constant. During this process, the temperature of the waste heat boiler feed gas may fluctuate.
  • the temperature of the waste heat boiler supply gas 23 is detected, and the amount of the circulating gas 37 is adjusted so that the detected waste heat boiler supply gas temperature becomes the target range temperature. Adjustment is preferred.
  • the required amount of circulating gas valve 38 closes the required amount of circulating gas valve 38.
  • the above (12) to (15), (18), and (19) of the present invention relate to feed pack control for minimizing the contents of combustible components and oxygen in the circulating gas. Further, the above (16) and (17) of the present invention relate to feedforward control for minimizing the content of combustible components and oxygen in the circulating gas against disturbance.
  • air (SF air 25) is supplied to the high-temperature exhaust gas 22 discharged from the fire extinguishing tower before reaching the waste heat boiler 7, and the SF air amount is adjusted.
  • the concentration of carbon monoxide or hydrogen in the gas 37 circulating in the waste heat boiler 7 or the calorific value of the circulating gas due to these gas components is adjusted to be constant, and the oxygen concentration is adjusted to be below a certain concentration. .
  • Figure 4 (a) shows the block diagram in this case.
  • the injection of PC air 24 and PC water ⁇ steam 26 is not essential, but SF air 25 is usually used to burn carbon monoxide generated by blowing PC air 24. Is supplied, so that at least PC air 24 is often blown at the same time.
  • the measurement of the gas component in the gas 37 circulating in the waste heat boiler 7 is preferably performed by sampling the gas after leaving the waste heat boiler 17. This is because the reaction between unburned gas and oxygen gas may continue after the waste heat boiler inlet.
  • an unburned combustible gas component is detected in the circulating gas 37, the amount of SF air 25 necessary and sufficient to burn the combustible gas component is increased.
  • oxygen gas is detected in the circulating gas 37, the amount of SF air 25 corresponding to the oxygen gas amount is reduced.
  • control can be performed by focusing only on carbon monoxide.
  • a target value is set for the concentration of carbon monoxide in the gas circulating in the waste heat boiler, and an upper limit value and a target value are set for the oxygen concentration in the gas to perform adjustment. Can be.
  • the amount of SF air is adjusted so that the concentration of carbon monoxide becomes the target value, and when the oxygen concentration exceeds the upper limit, the adjustment of the amount of SF air based on the concentration of carbon monoxide is interrupted to stop the oxygen flow.
  • the amount of SF air is adjusted so that the concentration becomes the target value, and the oxygen concentration is Byway below the target value or the lower limit, or the oxygen concentration is lower than the target value or the lower limit, and the carbon monoxide concentration is the target value.
  • the process is mainly composed of hydrogen as a combustible gas component, it is preferable to focus on only hydrogen and perform control as described in (14) of the present invention.
  • the calorific value when each combustible gas is burned, and as described in (15) of the present invention, one of the gases
  • the product of the concentration of carbon oxide and the calorific value of carbon monoxide is added to the product of the concentration of hydrogen in the gas and the calorific value of hydrogen to obtain a circulating gas calorific value, and a target value is set for the calorific value.
  • an upper limit value and a target value are set for the oxygen concentration in the gas.
  • the amount of SF air is adjusted so that the calorific value of the circulating gas becomes the target value.
  • the adjustment of the amount of SF air by the calorific value of the circulating gas is interrupted to stop the oxygen. Adjust the amount of SF air so that the concentration becomes the target value, and the oxygen concentration falls below the target value or the lower limit, or the oxygen concentration If the value is below the target value or the lower limit and the circulating gas calorific value exceeds the target value, the adjustment of the SF air amount based on the circulating gas calorific value is restarted.
  • the concentrations of carbon monoxide, hydrogen, the amount of heat generated by the circulating gas, and the concentration of oxygen in the circulating gas can always be controlled to a certain level or less at a level that does not cause any problem.
  • the target value of the concentration of carbon monoxide or hydrogen or the calorific value of circulating gas is a value exceeding zero, and it is desirable to determine and set the minimum point where the oxygen concentration does not exceed the upper limit value with the actual machine.
  • the fluctuation of the amount of coke 10 discharged from the fire extinguishing tower is detected, and the detected fluctuation of the amount of discharge of the cotus is regarded as a disturbance, and the monoxide in the gas circulating through the waste heat boiler is detected. It performs feedforward control to prevent fluctuations in carbon or hydrogen concentration and oxygen concentration.
  • the amount of cortus discharged from the fire tower increases, the amount of combustible gas components in the circulation gas also increases accordingly.
  • the amount of increase in combustible gas components due to the increase in coke emissions can be determined by calculation and experiment.
  • the same amount of increase in SF air to offset this increase in combustible gas components is determined by the same calculation and experiment, and feedforward control is performed.
  • the control can be performed without changing the amounts of combustible gas components and oxygen.
  • Figure 4 (b) shows the block diagram in this case. This figure also shows the feed pack control diagram.
  • the fluctuation of the amount of the PC air 24 is regarded as a disturbance, and the feedforward control is performed in the same manner as in the above (16) of the present invention, so that the combustible gas component in the circulating gas is obtained. And an increase in oxygen.
  • the invention of the above (17) of the present invention is combined with the invention of the above (1) and (9) of the present invention.
  • the feed pack control for keeping the vapor recovery amount constant while keeping the combustible gas component and the oxygen concentration of the circulating gas constant is also performed.
  • the amount of SF air 25 is reduced in the inventions (12) to (15) of the present invention.
  • the amount of combustion in the gas discharge pipe 12 fluctuates, and the amount of steam recovered in the waste heat boiler 7 fluctuates.
  • the SF air 25 when adjusting the amount of the SF air 25 so that the carbon monoxide concentration, the hydrogen concentration, the calorific value of the circulating gas, and the oxygen concentration in the circulating gas are not more than a certain concentration, the SF air 25 is adjusted. Adjust the amount of PC air 24 and / or the amount of PC water / steam 26 while adjusting the amount of 25. The ratio between the increased amount of SF air 25 and the decreased amount of PC air 24 and Z or PC water / steam 26 is determined so that the amount of heat input to waste heat piler 17 is constant.
  • the increase in SF air is a reaction that burns carbon monoxide and hydrogen, so the function of reducing carbon monoxide and hydrogen in the circulating gas is reduced.
  • the reduction of PC air, PC water, and steam reduces the amount of carbon monoxide generated in the pre-chamber, so that it also functions to reduce carbon monoxide in the circulating gas.
  • an increase in SF air causes an increase in steam generation, while a decrease in PC air, PC water and steam causes a decrease in steam generation.
  • PC water and steam are reduced while SF air is added, the reduction of PC water and steam will also reduce the amount of hydrogen in the circulating gas. Without reducing the hydrogen concentration in the circulating gas.
  • the oxygen concentration in the circulating gas is higher than the control value, the oxygen concentration in the circulating gas is reduced by reducing the SF air. In this case, the amount of combustible gas burned in the gas exhaust pipe does not change, so that the amount of recovered steam is not affected. Therefore, in the control for reducing the oxygen concentration in the circulating gas, it is only necessary to decrease the SF air 25, and it is not necessary for the PC air 24 to simultaneously increase the PC water / steam 26.
  • the amount of the waste heat boiler vapor recovery is kept constant as in the above (18) of the present invention. And the temperature inside the pre-chamber is also kept constant.
  • the ratio between the increase in SF air and the decrease in PC air and PC water / steam is determined so that the heat input to the waste heat boiler is constant. Further, in the above (18) of the present invention, the ratio between the adjustment amount of PC air and the adjustment amount of PC water / steam is determined so as to keep the temperature inside the pre-champer constant.
  • the high-temperature exhaust gas discharged from the fire extinguisher tower is supplied to the waste heat boiler 7 through the slow-pin flute section 4.
  • flying It is necessary to control the flow at a certain flow rate or less, because a scattering phenomenon occurs, which leads to a sudden increase in the circulation gas ventilation resistance and a trouble of abrasion damage of the boiler tube due to flying coke.
  • the bypass gas 19 is provided in the circulation gas path, and the amount of the bypass gas 29 is adjusted so that the amount of the exhaust gas 22 becomes a target value.
  • the amount of the bypass gas 29 By increasing the amount of the bypass gas 29, the amount of the gas 21 injected from the inert gas injection pipe 11 can be reduced while the amount of the circulating gas 37 is kept constant, thereby reducing the amount of the exhaust gas 22. can do.
  • the boiler supply gas pressure measured from the outlet of the cooling chamber to the waste heat boiler inlet is changed to the target value instead of the amount of the exhaust gas in the above (20) of the present invention.
  • the amount of the bypass gas is adjusted so that
  • the amount of gas coming from the cooling chamber is obtained from the amount of circulating gas, the amount of radiated gas, and the amount of bypass gas. It is necessary to determine the amount based on the amount of PC air, the amount of PC water and steam, and the amount of gas increased by the reaction, and since measuring or estimating these is complicated and difficult, the amount of high-temperature gas discharged from the fire tower It is a substitute for boiler feed gas pressure, which is known to have a certain relationship with.
  • the value of the ratio between the adjustment amount of PC air and the adjustment amount of PC water-steam is determined in advance, and the adjustment is performed so that the temperature inside the pre-chamber is kept constant. Is going. However, due to changes in various operating conditions of the dry fire extinguishing system, even if control is performed using the above-mentioned predetermined ratio value, the actual temperature in the pre-chamber will differ from the target value. There is.
  • the temperature in the pre-chamber is measured, and when a difference occurs between the temperature measured value in the pre-chamber and the target value, the adjustment amount of the PC air and the PC water / steam The value of the ratio of the adjustment amount is corrected to adjust the temperature in the pre-champer to the target value.
  • the temperature inside the pre-champer can always be made to coincide with the target value even if the operation factor of the apparatus fluctuates.
  • the temperature rise of the exhaust gas 22 will be large, and the slump pin fly In some cases, damage due to local abnormal temperature rise of the brick in the fuse area may occur.
  • the SF air 25 is introduced after the exhaust gas 22 merges with the low-temperature bypass gas 29 and the gas temperature decreases, so that the combustible gas is combusted by the SF air 25
  • the temperature of the exhaust gas does not rise so much, and damage due to local abnormal temperature rise of the brick can be prevented.
  • the present invention was applied to the coatus dry-type fire extinguishing apparatus shown in FIG.
  • the cooling room 2 of the dry fire extinguishing system has an internal volume of 600 m 3
  • the pre-chamber 3 has a content volume of 300 m 3 .
  • the glow coat 9 having an average temperature of 980 ° C was cooled at an average discharge of 170 tons / H.
  • PC air is blown into the space 31 formed by the red hot coke upper surface 30 and the pre-champer from above the pre-champer.
  • PC water / steam 26 for adjusting the temperature in the pre-chamber 1 was mixed with PC air 24 in the piping of the air blowing device 14 and the mixed gas was blown into the pre-chamber.
  • a bypass pipe 19 for branching a part of the inert gas supplied from the circulation blower 8 to the cooling chamber 2 and joining the part to the exhaust gas is provided.
  • Concentration meters for oxygen, carbon monoxide and hydrogen in the circulating gas components are measured from a sample tube 37 located at the outlet of the boiler.
  • a target value of 35 tons of steam generated by the waste heat boiler 7 being 130 tons / H
  • an oxygen concentration of The upper limit value is 0.3%
  • the lower limit value and the target value are 0.1%
  • the target temperature inside the pre-chamber is 1000 ° C
  • the temperature upper limit value of the waste heat boiler supply gas 23 is 980 ° C
  • the lower limit value is The temperature was set to 950 ° C, and continuous control over a long period of time was carried out with the target value of the amount of exhaust gas 22 discharged from the fire extinguisher tower 1 set to 264,000 Nm 3 / H.
  • the steam generation amount 35 was 130 ton / H.
  • the fluctuation of the steam generation amount 35 could be controlled within the range of 1.5 tons / H on the hourly average.
  • the steam generation amount 35 could be controlled within the range of 130 tons ZH soil and 1.5 tons ZH.
  • the carbon monoxide concentration in the circulating gas 37 was 0.3% on average, and the oxygen concentration could be reduced to 0.1% or less.
  • Table 1 shows the results in comparison with the conventional technology.
  • the internal temperature of the pre-chamber was 1000 ° C
  • the temperature of the waste heat boiler supply gas 23 was 965 ° C
  • the amount of exhaust gas was 22.2 64000Nm 3 ZH was obtained.As a result, foreign substances adhered to the slope pin flute.
  • the actual temperature of the discharged coke 10 was 180 ° C, which maximized the amount of sensible heat recovered from red-hot coke under the stable operating conditions described above.
  • the fire tower 1 for cooling red hot coke is formed in a vertical shape, and is provided with a pre-chamber 3 and a cooling chamber 2 in a vertical direction.
  • the pre-chamber 1 and the cooling chamber 2 are divided as a gas flow by a throw pin free part 4 formed around the inner wall thereof.
  • the red hot coke 9 having a temperature of around 980 ° C is charged from above the pre-chamber 13 and moves gradually downward, and is cooled in the cooling chamber 2 by the inert gas 27 blown from the blowing pipe 11 below the cooling chamber. You.
  • the temperature of the coatas 10 when discharged from the lower part of the cooling chamber is around 210 ° C.
  • the inert gas 27 blown in the cooling chamber is heat-exchanged with the glowing coats while rising in the cooling chamber, and the gas temperature rises, leading to a ring duct 5 from the sloping fuse section 4 above the cooling chamber. Is excreted. Further, the inert gas is sent from the ring duct 5 to the waste heat boiler 7 through the primary dust catcher 6, and heat is recovered by the waste heat boiler 7. Then, the temperature is lowered to around 180 ° C., and then blown into the cooling chamber 2 again through the circulation blower 8.
  • air 24 is blown into the pre-chamber from the air blowing device 14 at the top of the pre-chamber.
  • Oxygen in the blown air reacts with the remaining volatiles, fines and some of the lump coats.
  • the reaction is mainly an exothermic reaction that produces carbon monoxide, and the blown air, product gas, and coats descend inside the pre-chamber with increasing temperature, and reach the highest temperature in the lower part of the pre-chamber. Become.
  • the blown air and generated gas are mixed with an inert gas rising from below in the lower part of the pre-chamber, and are discharged from the slopping flue section 4 to the ring duct 5.
  • Air 25 may be blown from the air blow pipe 15 into the ring duct 5 or the gas discharge pipe 12. As a result, the carbon monoxide generated in the pre-chamber is burned to produce carbon dioxide.
  • water 26 is blown into the pre-chamber from above the pre-chamber by the water blowing device 16.
  • steam may be blown together with the water.
  • the injected water absorbs heat when it evaporates to steam, and the steam comes into contact with red-hot coke to generate hydrogen gas and carbon monoxide by the water gas reaction, and also absorbs heat.
  • the temperature of the gas and the coater in the pre-chamber decreases, and by adjusting the amount of water or steam blown, the temperature of the gas and the coater in the pre-champer can be adjusted.
  • Hydrogen gas and carbon monoxide generated by the water gas reaction descend inside the pre-chamber and rise below the pre-chamber. It is mixed with the active gas and discharged from the sloping free part 4 to the ring duct 5. If 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 amount of heat of the waste heat boiler supply gas 23 increases due to the combustion heat of the combustion.
  • the amount of heat supplied by the waste heat boiler supply gas 23 at the boiler inlet side increases as a result of blowing water or steam into the pre-chamber 1. Therefore, in the case of the present invention in which water or steam is blown, it is also possible to reduce the amount of air blown into the prepumper while securing the amount of heat required 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. Can be simultaneously adjusted to optimal conditions.
  • the pre-chamber blown air can be supplied without supplying water or steam from the pre-chamber. It is possible to lower the temperature inside the pre-chamber simply by reducing the amount of air blown.
  • Ash in coke powder was conventionally considered to melt at 1400 ° C or higher, but many tests showed that it softened and melted at about 1200 ° C.
  • the softening temperature tends to decrease, and considering the temperature variation in the cross section of a prechamper with a radius of about 10 m, the temperature of 1150 ° C is considered to be the main operation standard. I found it. Furthermore, it is effective to manage at a lower temperature in consideration of safety from the viewpoint of long-term stable operation.
  • the air 24 is introduced into the pre-champer.
  • a coke dry fire extinguisher characterized by spraying water 26 into the pre-chamber at the same time as blowing the water 26 into a mist, and mixing the mist-like water with air 24 to blow into the pre-chamber.
  • Method and apparatus Air and water may be blown into the pre-chamber at the same time as steam is blown.
  • the water 24 blown into the pre-champer needs to be evenly distributed on the surface of the upper part 30 of the glow coat layer filled in the pre-champer.
  • Non-uniform spraying will result in excessive cooling of the glow coat in places where a large amount of water has been sprayed, but will not sufficiently reduce the temperature of the glow coke in places where water has not been sprayed. .
  • water is sprayed on red hot coke close to the brick on one side wall of the pre-chamber for the purpose of evenly spraying the water, the water will be scattered on the brick, causing damage to the brick.
  • the water blown into the pre-chamber into mist it is possible to prevent the water sprayed on the red hot coke from being scattered on the bricks, and to further blow the mist water into the pre-chamber.
  • By mixing and blowing the water it becomes possible to spread the mist water uniformly and widely, and to evenly spread it on the surface of the glowing coke inside the pre-chamber.
  • atomized water does not mean a mist that does not contain any droplets, but only mist of water that can be obtained with a commonly used flat spray nozzle. Small droplets may be included.
  • the blowing device 46 for spraying water in a mist state, mixing it with air, and blowing it into the precyanper is disposed vertically in an air blowing pipe 47. It has two water mist nozzles (42a, 42b), and the water mist nozzles, as shown in FIG. Is characterized by spraying water at a wide angle and vertically at a narrow angle.
  • reference numeral 43 denotes the trajectory of the spray water
  • reference numeral 44 denotes the spray range of the spray water.
  • the nozzle 42a arranged above adjusts the spray speed and spray angle so that the water reaches a long distance, and mainly adjusts the inside of the pre-champer.
  • the nozzle 42b arranged below adjusts the fog speed and the spray angle so that the water reaches a short distance, and is mainly provided on the surface of the red heat status close to the blowing device in the pre-champer. Make water fog.
  • blowing devices of the present invention can be arranged at different positions in the circumferential direction within the plethysper.
  • the range over which a single blowing device should be powered is not the entire distance of the diameter of the pre-champer, but the power from the immediate vicinity of the blowing device to the center of the pre-champer.
  • the water spray nozzle sprays water at a wide angle in the horizontal direction, as shown in Fig. 8 (b), the entire pre-champer spreads to the left and right of the injection port. Water can be sprayed on the surface of the glow coat in width. On the other hand, the water fog nozzle fogs water almost horizontally.
  • the water mist nozzle is a narrow angle, the water can be sufficiently mist sprayed by sufficiently covering the half width of the pre-champer, which is the range covered by the nozzle.
  • the atomized water is carried to the high-speed air flow, and the atomized water can reach the distant side from the blowing device 46 in the pre-chamber. .
  • the pre-chamber 13 has two or more blowing ports 45 of the blowing device 46 in the circumferential direction of the pre-champer for blowing air and water into the pre-chamber 13.
  • Pre-champer Circumferential angle ⁇ is set within the following range.
  • ⁇ is the circumferential angle of the pre-champer between adjacent blowing ports
  • N is the number of blowing ports. For example, 90 ° ⁇ ⁇ ⁇ 270 ° for two nozzles, and 60 ° ⁇ ⁇ ⁇ 180 ° for three nozzles.
  • FIG. 9 (a) shows the case where the number N of the inlets 45 is 2 and the angle 0 is 180 °
  • Fig. 9 (b) shows the case where the N is 3 and Q ifi 120 °
  • FIG. 44 is a diagram showing a range 44.
  • the air and water or steam blown into the pre-champer are preferably blown into the upper part 30 of the glow coke layer in the pre-champ or into the space 31 formed by the glow coat layer surface and the pre-champ.
  • air and water or steam are blown into the red hot coat layer 32, these gases This is because the reaction proceeds only in the coater in the vicinity of the blown gas, the gas distribution becomes uneven, and the temperature distribution and reactivity within one cross section of the pre-chamber vary.
  • the glow coat 9 charged into the pre-chamber is charged at a time in large quantities, and thereafter charging may be interrupted. Therefore, the surface position of the upper part 30 of the red hot coke layer in the pre-chamber changes every moment.
  • the height direction position of the air and water blowing port 45 blown from the upper part of the pre-chamber of the present invention is determined by the predetermined coke product in the pre-champer, as described in the above (26) and (33) of the present invention. It is preferable to be higher than the position.
  • the upper end of the red hot coater in the pre-chamber may exceed the coke product upper limit position. is there.
  • the pre-champer when the upper end of the coater loaded in the pre-champer is higher than the predetermined coke stacking upper limit position, the pre-champer is loaded into the pre-champer. If the air and water blowing is interrupted or the blowing volume is reduced, and the upper end of the coater falls below the upper limit position or a predetermined designated position, water and air It is preferable to restart the blowing or to increase the blowing amount.
  • the measured temperature in the pre-chamber is sent to the blowing control device 17, and the blowing control device 17 controls the blowing amount of the water or steam 16 or the air 24 so that the temperature in the pre-chamber reaches the target temperature.
  • the method of measuring the temperature inside the pre-chamber is to measure the ambient temperature or coke temperature near the inside of the inner brick by inserting a thermometer through the wall from outside to a part of the pre-champer.
  • the method used was to measure the temperature of the inner brick or the ambient temperature with a thermometer inserted, or to measure the temperature of the brick near the lower part of the pre-chamber with a thermocouple thermometer.
  • thermometer such as a thermocouple
  • life of the thermometer is short, and it is necessary to replace the thermometer every time it deteriorates. Had occurred.
  • a ring duct 5 is installed to discharge high-temperature gas that has recovered sensible heat.
  • the glow coke can be directly observed through the opening of the ring duct 5.
  • the present inventors measured the temperature of the red hot coke just below the pre-chamber observed through the opening of the ring duct 5 using a non-contact optical thermometer 18, and found that the measured temperature of the red hot coat was measured in the pre-chamber. It has been found that the temperature inside the pre-champer can be used as the internal temperature for controlling the temperature inside the pre-champer, and that the temperature inside the pre-champer can be kept constant with sufficient accuracy.
  • the above (28), (29), and (34) of the present invention have been made based on the above findings. That is, as described in the above (34) of the present invention, the non-contact optical thermometer 18 for measuring the surface temperature of the coke immediately below the outlet of the pre-champer is disposed, and the present invention is provided in the above (28) of the present invention. As described above, the temperature is measured by this thermometer, and the operation management or control is performed using the measured temperature as the temperature in the pre-champer.
  • air is blown into the pre-champer from above the pre-champer using the surface temperature of the coke immediately below the pre-champer outlet measured by the non-contact optical thermometer 18.
  • water or steam is blown, and either the water or steam blow-in or the pre-champer blow-in air blow-off is performed so that the temperature in the pre-chamber 1 is equal to or lower than a predetermined temperature. Adjust both.
  • thermometer Unlike conventional thermocouple thermometers, the durability of the thermometer has been greatly improved, and the frequency of replacing the thermometer has been significantly reduced. In the event of a thermometer failure, unlike a thermocouple thermometer installed through a brick, it is sufficient to simply repair / replace the optical thermometer 18 installed in the space of the slow pin dwelling unit 4. Therefore, the burden of repair and inspection can be significantly reduced.
  • the non-contact optical thermometer 18 a radiation thermometer, a two-color pyrometer, or the like can be used.
  • the unburned gas contained in the circulating gas is converted into thermal energy by injecting air and burning, and at least at the point when the circulating gas passes through the waste heat boiler, the unburned gas is not contained in the circulating gas It is preferable to do so.
  • the air blowing 25 may be recovered from the fire extinguisher tower 1 and blown into the gas toward the waste heat boiler 7 from the air blowing device 14.
  • carbon monoxide and hydrogen generated by the reaction of the air, water, and steam blown into the pre-chamber with the red heat coat are burned by the air 25 blown into the circulating gas to become carbon dioxide and water.
  • heat is generated, and the waste heat boiler 7 can effectively recover energy as steam.
  • the present invention was applied to the coke dry fire extinguishing apparatus shown in FIG.
  • the cooling room 2 of the dry fire extinguishing system has an internal volume of 600 m 3
  • the pre-chamber 3 has a content volume of 300 m 3 .
  • the red hot coatas 9 with an average temperature of 980 ° C was cooled at an average discharge of 170 tons H.
  • the blowing device 46 for blowing air and water into the pre-chamber at the same time one having the form shown in FIG. 6 was used, and two of them were arranged in the pre-chamber.
  • Radiation thermometers are installed at two locations in the throw pin duffle section as temperature measurement means in the pre-chamber, and can be viewed through the ring duct. The temperature of the red hot coke that was observed was measured in a non-contact manner, and the average temperature of the two temperature measurements was taken as the temperature inside the pre-chamber.
  • the two thermometers were installed at 90 ° and 270 ° with the boiler side at 0 ° in the circumferential direction of the ring duct.
  • the upper limit of the loading capacity of the coater in the pre-champer was set to 120 tons, and the designated loading value was set to 110 tons.
  • the blowing device 42 was installed at a distance of 1 m above the surface of the coater at the upper limit of coke loading.
  • the target temperature inside the pre-champer is set to 100CTC, and the amount of air blown into the pre-champer is 5,000 to 30000Nm 3 h according to the fluctuation of coke discharge because the amount of steam generated in the waste heat boiler 7 is kept constant.
  • the amount of water injected into the pre-champer 26 was varied in the range of 0.5 to 2.5 th in order to maintain the target temperature inside the pre-champer.
  • the actual temperature of the pre-chamber was controlled within the range of 1000 ⁇ 20 ° C, and there was no foreign matter adhering to the sloping free part.
  • no damage to the brick due to splashing of water on the pre-champer brick was observed, and no damage to the brick due to local cooling of the pre-champer brick was observed.
  • the non-contact thermometer using the radiation thermometer has been operating stably for a long time.
  • the temperature of a part of the pre-champer can be maintained at a constant value to prevent foreign matter from adhering to the slowing flute.
  • the gas temperature at the waste heat boiler inlet is maintained within a certain range, and the boiler tube is damaged by heat. At the same time, it is possible to prevent a decrease in heat recovery efficiency in the boiler.
  • the amount of exhaust gas discharged from the fire extinguisher tower is maintained at a constant flow rate to prevent the rise of the cortus from the sloping flow, increase the circulating gas ventilation resistance due to scattering, and prevent abrasion damage to the boiler tube, and at the same time prevent the cooling chamber It is possible to maximize sensible heat recovery from red-hot coke at the site.
  • the water blown into the plethysm bar is atomized, so that the water sprayed on the red hot coke can be prevented from scattering on the bricks.
  • the mist water can be diffused uniformly and widely, and can be evenly spread on the surface of the glowing coat in the pre-chamber.
  • the present invention significantly improves the durability of the thermometer by measuring the temperature of the red glow coats observed through the opening of the ring duct with a non-contact optical thermometer.
  • the frequency of changing the meter can be greatly reduced. Therefore, the present invention can greatly reduce the load of repair and inspection even in the case of a thermometer failure.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Coke Industry (AREA)

Abstract

L'invention concerne un procédé de refroidissement de coke permettant de récupérer de la chaleur sous forme de vapeur dans une chaudière de récupération à l'aide d'une colonne de refroidissement comprenant une chambre de refroidissement et une préchambre située au-dessus, par chargement de coke d'ignition par la partie supérieure de la préchambre, par souffage d'air et/ou d'eau ou de vapeur dans la préchambre, et par échange de chaleur sensible du coke d'ignition dans la chambre de refroidissement à l'aide d'un gaz inerte. La quantité de vapeur récupérée est maintenue à un niveau constant par régulation de la quantité d'air et/ou d'eau ou de vapeur soufflée dans la préchambre de manière que la quantité de chaleur entrant dans la chaudière de récupération atteigne un niveau cible. La quantité du composant de gaz combustible et du composant d'oxygène dans le gaz de circulation est maintenue à un niveau minimal. L'adhérence de corps étrangers au conduit de fumée incliné est évitée, l'efficacité de récupération de la chaleur n'est pas réduite et les tubes de la chaudière sont protégés contre les dommages thermiques. La quantité de chaleur sensible récupérée est maximisée, et l'augmentation de la résistance à la ventilation du gaz de circulation est évitée, tout en protégeant les tubes de la chaudière contre les dommages dues à l'usure.
PCT/JP2002/008755 2002-08-29 2002-08-29 Procede et systeme de refroidissement de coke WO2004022672A1 (fr)

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PCT/JP2002/008755 WO2004022672A1 (fr) 2002-08-29 2002-08-29 Procede et systeme de refroidissement de coke
CN028298217A CN1694943B (zh) 2002-08-29 2002-08-29 干熄焦方法及装置

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2520453C2 (ru) * 2012-06-14 2014-06-27 Открытое акционерное общество "Восточный научно-исследовательский углехимический институт" (ОАО "ВУХИН") Установка для термоподготовки шихты и охлаждения кокса
CN106178806A (zh) * 2016-07-28 2016-12-07 攀钢集团攀枝花钢铁研究院有限公司 一种焦炉烟道气余热的利用方法
CN107365592A (zh) * 2016-05-11 2017-11-21 神华集团有限责任公司 高温物料溜管、流量检测系统和煤热解系统
CN110205146A (zh) * 2018-05-30 2019-09-06 西安华江环保科技股份有限公司 一种蒸汽压力熄焦系统及方法
WO2020081037A1 (fr) * 2018-10-19 2020-04-23 Евгений Алексеевич ДАНИЛИН Chambre d'extinction d'une installation d'extinction à sec de coke
CN113416559A (zh) * 2021-07-16 2021-09-21 中煤能源研究院有限责任公司 一种锅炉烟气干熄焦系统及使用方法

Families Citing this family (3)

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CN101775295B (zh) * 2010-02-04 2013-02-20 太原理工大学 一种组合式干熄焦装置及其工艺
CN102277179B (zh) * 2011-07-31 2014-05-07 圣火科技(河南)有限责任公司 一种经济型干熄焦装置
CN102786950B (zh) * 2012-08-06 2014-01-29 山西鑫立能源科技有限公司 一种干熄焦废气产生及燃烧加热方法

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JPS59155490A (ja) * 1983-02-22 1984-09-04 Ishikawajima Harima Heavy Ind Co Ltd コ−クス乾式消火設備におけるボイラ蒸気発生量の制御方法及びその装置
JP2001090901A (ja) * 1999-09-17 2001-04-03 Nkk Corp Ｃｄｑ設備における蒸気発生量制御方法
DE10046334A1 (de) * 1999-09-20 2001-05-31 Nippon Steel Corp Verfahren und Vorrichtung zum Trockenlöschen von Koks

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JPS59155490A (ja) * 1983-02-22 1984-09-04 Ishikawajima Harima Heavy Ind Co Ltd コ−クス乾式消火設備におけるボイラ蒸気発生量の制御方法及びその装置
JP2001090901A (ja) * 1999-09-17 2001-04-03 Nkk Corp Ｃｄｑ設備における蒸気発生量制御方法
DE10046334A1 (de) * 1999-09-20 2001-05-31 Nippon Steel Corp Verfahren und Vorrichtung zum Trockenlöschen von Koks

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2520453C2 (ru) * 2012-06-14 2014-06-27 Открытое акционерное общество "Восточный научно-исследовательский углехимический институт" (ОАО "ВУХИН") Установка для термоподготовки шихты и охлаждения кокса
CN107365592A (zh) * 2016-05-11 2017-11-21 神华集团有限责任公司 高温物料溜管、流量检测系统和煤热解系统
CN107365592B (zh) * 2016-05-11 2019-07-02 神华集团有限责任公司 高温物料溜管、流量检测系统和煤热解系统
CN106178806A (zh) * 2016-07-28 2016-12-07 攀钢集团攀枝花钢铁研究院有限公司 一种焦炉烟道气余热的利用方法
CN106178806B (zh) * 2016-07-28 2019-07-26 攀钢集团攀枝花钢铁研究院有限公司 一种焦炉烟道气余热的利用方法
CN110205146A (zh) * 2018-05-30 2019-09-06 西安华江环保科技股份有限公司 一种蒸汽压力熄焦系统及方法
WO2020081037A1 (fr) * 2018-10-19 2020-04-23 Евгений Алексеевич ДАНИЛИН Chambre d'extinction d'une installation d'extinction à sec de coke
RU2735841C2 (ru) * 2018-10-19 2020-11-09 Евгений Алексеевич Данилин Критерий камеры тушения установки сухого тушения кокса
CN113416559A (zh) * 2021-07-16 2021-09-21 中煤能源研究院有限责任公司 一种锅炉烟气干熄焦系统及使用方法

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