WO2020054375A1 - Appareil d'extinction d'incendie à coke sec et procédé d'élimination de poussière de coke dans une chaudière d'appareil d'extinction d'incendie à coke sec - Google Patents

Appareil d'extinction d'incendie à coke sec et procédé d'élimination de poussière de coke dans une chaudière d'appareil d'extinction d'incendie à coke sec Download PDF

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Publication number
WO2020054375A1
WO2020054375A1 PCT/JP2019/033281 JP2019033281W WO2020054375A1 WO 2020054375 A1 WO2020054375 A1 WO 2020054375A1 JP 2019033281 W JP2019033281 W JP 2019033281W WO 2020054375 A1 WO2020054375 A1 WO 2020054375A1
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WIPO (PCT)
Prior art keywords
duct
boiler
coke
dust
fire extinguishing
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PCT/JP2019/033281
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English (en)
Japanese (ja)
Inventor
光平 岸本
征太郎 田島
成海 青木
哲治 阿南
和也 江口
Original Assignee
日鉄エンジニアリング株式会社
日鉄プラント設計株式会社
北京中日▲聯▼▲節▼能▲環▼保工程技▲術▼有限公司
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Application filed by 日鉄エンジニアリング株式会社, 日鉄プラント設計株式会社, 北京中日▲聯▼▲節▼能▲環▼保工程技▲術▼有限公司 filed Critical 日鉄エンジニアリング株式会社
Priority to CN201980011435.7A priority Critical patent/CN111684044B/zh
Publication of WO2020054375A1 publication Critical patent/WO2020054375A1/fr

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    • 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

Definitions

  • the present invention relates to a coke dry fire extinguishing system and a method for removing coke dust in a boiler of a coke dry fire extinguishing system.
  • Coke dry quenching equipment (CDQ: Coke Dry Quenching) is equipment that cools red hot coke steamed in a coke oven and produces high-temperature, high-pressure steam using the recovered heat. It is commonly used as power for production and process steam.
  • the CDQ mainly has two heat exchangers, a chamber and a boiler.
  • a circulating cooling gas in which nitrogen is a main component, CO 2 , H 2 O, a small amount of CO, red hot coke is cooled by utilizing the gas, etc.
  • the chamber and the boiler are connected to a primary dust collector (primary dust catcher) via a first duct, and further connected to the boiler via a second duct.
  • the boiler is connected to a secondary dust collector (secondary dust catcher) via a third duct, and is connected to a chamber via a third duct via a blower such as a gas blower.
  • a low-temperature circulating cooling gas of, for example, 200 ° C. or less is supplied to the lower part of the chamber by a blower constituting the circulating equipment, and the circulating cooling gas rises upward in the chamber.
  • the hot red coke is cooled by contact with the hot red hot coke falling from above.
  • the circulating cooling gas heated by the contact with the red hot coke passes through the ring duct on the outer periphery above the chamber, enters the primary dust catcher from the first duct, and flows from the primary dust catcher to the boiler.
  • the circulating cooling gas contains unburned gas such as CO.
  • the unburned gas In order to complete the combustion reaction of the unburned gas before the circulating cooling gas reaches the inlet of the boiler, the unburned gas is unburned.
  • An air introduction passage for gas combustion is provided in a ring duct or the like above the chamber, from which combustion air is introduced and supplied to the circulating cooling gas.
  • the circulating cooling gas flowing through the first duct generally contains a large amount of coke dust having a high abrasion property, but about 20 to 30% of the entire coke dust is roughly collected by a primary dust catcher. The remaining coke dust is collected by the secondary dust catcher.
  • abrasion due to the coke dust in the boiler has been a problem. Therefore, as a measure for preventing the wear, a wear-resistant material (sprayed material) is applied in the boiler, and a low flow rate control of the circulating cooling gas in the system of the equipment has been performed.
  • a wear-resistant material spray material
  • a low flow rate control of the circulating cooling gas in the system of the equipment has been performed.
  • the measures for preventing abrasion particularly cause the cost and scale of the boiler to increase, the measures for preventing abrasion caused by coke dust in the boiler have had a great effect on the manufacturing cost of the entire equipment.
  • a temperature of about 800 to 900 ° C. can be obtained.
  • a coke dry fire extinguishing system has been proposed in which the suppressed circulating cooling gas can be introduced into a primary dust collector, whereby a cyclone can be applied to the primary dust collector (for example, see Patent Document 1). If a high-temperature circulating cooling gas of about 1000 ° C. is supplied to the cyclone, it becomes difficult to employ a general heat-resistant steel such as stainless steel as a material for forming the cyclone. Since it must be used, the problem of equipment cost cannot be solved.
  • the boiler has a water-cooling wall or a hanging tube that hangs a heat transfer tube from the ceiling of the boiler.Coke dust adheres to the water-cooling wall and the hanging tube in addition to the heat transfer tube. Therefore, the coke dust needs to be widely removed in the boiler.
  • the present invention has been made in view of the above problems, and is capable of removing coke dust adhering and accumulating in a boiler, coke dry fire extinguishing equipment, and coke dust removal in a boiler of a coke dry fire extinguishing equipment. It is intended to provide a way.
  • one embodiment of a coke dry fire extinguishing system includes a chamber, a dust collector including a cyclone, a boiler, a first duct connecting the chamber and the cyclone, and connecting the cyclone and the boiler.
  • a circulating cooling gas flows in a system of a coke dry fire extinguishing system having a second duct and a third duct connecting the boiler and the chamber, and coke in which the coke dust in the circulating cooling gas is collected by the dust collector.
  • Dry fire extinguishing equipment, The coke dust collected by the dust collector is supplied to the boiler as removal dust for removing coke dust accumulated in the boiler.
  • the boiler is provided with a special removal facility or the like by supplying coke dust collected in the cyclone to the boiler as removal dust for removing coke dust accumulated in the boiler. Without removing the coke dust accumulated in the boiler.
  • coke dust of relatively large particle size is collected in the cyclone, so this relatively large particle size of coke dust is applied to dust for removal. Things.
  • the large-diameter coke dust has caused abrasion of the equipment in the boiler. It enables the removal of small particle size coke dust.
  • the average particle size of the small particle size coke dust accumulated in the boiler is in the range of about 20 ⁇ m to 30 ⁇ m.
  • the particle diameter of coke dust collected by the cyclone is about 30 ⁇ m to 5 mm.
  • the supply of the coke dust collected by the dust collector into the boiler is performed intermittently.
  • the coke dust collected in the cyclone is intermittently supplied into the boiler, thereby suppressing the wear of the equipment in the boiler and coke having a small particle diameter accumulated in the boiler. Dust can be removed.
  • ⁇ intermittent supply '' means that the supply of coke dust collected in the cyclone to the boiler is performed for a relatively short time, then the supply is stopped, and the operation of the coke dry-type fire extinguishing equipment is performed for a certain period of time. After that, it means running the next coke dust to the boiler for a relatively short time.
  • another aspect of the coke dry fire extinguishing equipment according to the present invention is such that in the system of the coke dry fire extinguishing equipment, the circulating cooling gas flows from the chamber to the boiler via the first duct and the second duct, Flowing from the boiler through the third duct to the chamber, A fourth duct extends from the dust collector, A blower is interposed in the third duct, and in the third duct, a fifth duct branches from a position on the gas flow downstream side of the blower and communicates with the second duct or the boiler, Coke dust supplied from the dust collector to the fifth duct via the fourth duct is supplied to the boiler from the second duct with a circulating cooling gas, or supplied directly to the boiler with a circulating cooling gas. It is characterized by that.
  • the coke dust collected by the cyclone can be air-flowed to the boiler via the second duct.
  • the second duct has a rising portion that rises upward from the top of the cyclone, and a horizontal portion that is bent from the rising portion and extends in the horizontal or substantially horizontal direction.
  • the communication point of the fifth duct to the second duct may be a rising portion or a horizontal portion.
  • the fifth duct may be in direct communication with, for example, the upper space of the boiler. In this case, coke dust is directly transported to the boiler via the fifth duct.
  • Another aspect of the coke dry fire extinguishing system according to the present invention is a sixth duct extending from the dust collector, directly or indirectly communicating with a pressurized tank, and extending from the dust collector. Communicates with the second duct, The coke dust supplied from the dust collector to the pressurized tank via the fourth duct is supplied to the second duct via the sixth duct by a circulating cooling gas or an inert gas pressurized in the pressurized tank. And supplied from the second duct to the boiler.
  • the coke dust collected in the cyclone can be air-flow conveyed to the boiler through the second duct.
  • the fourth duct extends and communicates directly or indirectly with the pressurized tank
  • "indirectly communicates” means, for example, a conveyor or the like below the fourth duct, This means a mode in which coke dust is conveyed by a conveyor via a fourth duct, then the coke dust is stored in a storage tank, and the coke dust is supplied from the storage tank to a pressurized tank.
  • the pressurized tank communicates with a duct extending from the inert gas supply source or a branch duct branched from a position downstream of the gas flow from the blower in the third duct. Supplies a circulating cooling gas or an inert gas. After the gas is pressurized in the pressurized tank, the open / close valve on the outlet side of the pressurized tank is opened, so that the coke dust can be conveyed by the pressurized circulating cooling gas or inert gas. Also in this embodiment, when the second duct has a rising portion and a horizontal portion, the communicating portion of the sixth duct to the second duct may be a rising portion or a horizontal portion. You may.
  • the dust collector has a classification screen, The coke dust collected by the dust collector is passed through the classification screen to select coke dust having a predetermined particle size range, and the selected coke dust is supplied to the fourth duct.
  • coke dust having a particle size range suitable for removing coke dust accumulated in the boiler can be selected and supplied to the boiler.
  • coke dust having a large particle size range of about 0.5 mm to 5 mm can be selected and supplied to the boiler from a wide particle size range of about 30 ⁇ m to 5 mm.
  • One embodiment of a method of removing coke dust in a boiler of a coke dry-type fire extinguishing system includes a chamber, a dust collector including a cyclone, a boiler, a first duct connecting the chamber and the cyclone, the cyclone, A circulating cooling gas flows in a system of a coke dry fire extinguishing system having a second duct connecting the boiler and a third duct connecting the boiler and the chamber, and coke dust in the circulating cooling gas is collected by the dust collector.
  • a method of removing coke dust accumulated in the boiler a method of removing coke dust in a boiler of a coke dry-type fire extinguishing system,
  • the coke dust collected by the dust collector is supplied to the boiler as removal dust for removing coke dust accumulated in the boiler.
  • the boiler is provided with a special removal facility or the like by supplying coke dust collected in the cyclone to the boiler as removal dust for removing coke dust accumulated in the boiler. Without removing the coke dust accumulated in the boiler.
  • Another aspect of the method for removing coke dust in a boiler of a coke dry-type fire extinguishing system according to the present invention is characterized in that supply of coke dust collected by the dust collector into the boiler is performed intermittently.
  • the coke dust collected in the cyclone is intermittently supplied into the boiler, thereby suppressing the wear of the equipment in the boiler and coke having a small particle diameter accumulated in the boiler. Dust can be removed.
  • Another aspect of the method for removing coke dust in a boiler of a coke dry fire extinguishing system is that in the system of the coke dry fire extinguishing system, the circulating cooling gas is supplied from the chamber to the first duct and the second duct. Flowing to the boiler via a duct, from the boiler to the chamber via the third duct, A fourth duct extends from the dust collector, A blower is interposed in the third duct, and a fifth duct branches off from a position on the gas flow downstream side of the blower in the third duct and communicates with the second duct. The coke dust supplied from the dust collector to the fifth duct via the fourth duct is conveyed to the second duct by a circulating cooling gas, and is supplied to the boiler from the second duct.
  • the coke dust collected by the cyclone can be air-flowed to the boiler via the second duct.
  • a fourth duct extends from the dust collector and communicates directly or indirectly with a pressurized tank, and A sixth duct extending from the tank communicates with the second duct, Coke dust supplied from the dust collector to the pressurized tank via the fourth duct is conveyed to the second duct via the sixth duct by a circulating cooling gas or an inert gas pressurized in the pressurized tank. And it supplies to the said boiler from this 2nd duct.
  • the coke dust collected in the cyclone can be air-flow conveyed to the boiler through the second duct. it can.
  • the dust collector has a classification screen, The coke dust collected by the dust collector is passed through the classification screen to select coke dust having a predetermined particle size range, and the selected coke dust is supplied to the fourth duct.
  • coke dust having a particle size range suitable for removing coke dust accumulated in the boiler can be selected and supplied to the boiler.
  • FIG. 3 is a diagram illustrating an example of a hardware configuration of a controller. It is a mimetic diagram showing the schematic structure of the coke dry type fire extinguishing equipment concerning a 2nd embodiment.
  • FIG. 1 is a schematic diagram showing a schematic configuration of a coke dry fire extinguishing facility according to the first embodiment
  • FIG. 2 is a schematic diagram showing an internal configuration of a boiler.
  • FIG. 3 is a diagram illustrating an example of a hardware configuration of the controller. As shown in FIG.
  • the coke dry fire extinguishing system 100 includes a chamber 10, a dust collector 20 including a cyclone, a boiler 30, a first duct 40 connecting the chamber 10 and the cyclone 20, and a second duct 40 connecting the cyclone 20 and the boiler 30. It has a second duct 50, a third duct 60 connecting the boiler 30 and the chamber 10, and a controller 80 for controlling the opening / closing and opening of various on-off valves and the like.
  • the command signal line from the controller 80 is branched from the on-off valve 71 a of the fourth duct 71 immediately below the cyclone 20 and the gas flow downstream of the blower 61 (such as a circulation fan) of the third duct 60.
  • the command signal line from the controller 80 is in principle connected to all the on-off valves shown in the figure, and the command signal can be transmitted from the controller 80 to each on-off valve.
  • This on-off valve is a valve whose opening degree can be adjusted in addition to opening and closing of the valve.
  • a temperature sensor (not shown) is provided at an appropriate place in the system, and a measurement signal from the temperature sensor is transmitted to the controller 80. Based on the measured temperature (such as the temperature of the circulating cooling gas and the temperature in the boiler) at each location, the controller 80 receives the temperature of the circulating cooling gas circulating in the system, for example, so that the temperature at each location becomes a predetermined temperature (range). Control.
  • the main circulation route of the circulating cooling gas in the coke dry fire extinguishing system 100 is as follows. That is, the ring cooling gas flows from the chamber 10 to the first duct 40 in the X1 direction, flows from the first duct 40 to the cyclone 20 in the X2 direction, flows from the cyclone 20 to the second duct 50 in the X3 direction, and flows to the boiler 30 in the X4 direction. Enter the direction.
  • the circulating cooling gas flowing through the boiler 30 flows in the third duct 60 in the X5 direction, and is supplied with flow velocity energy by a blower 61 provided at an intermediate position of the third duct 60 to flow in the third duct 60 in the X6 direction.
  • a preheater 62 is interposed in the third duct 60, and the circulating cooling gas flows into the preheater 62 in the X7 direction, and then flows into the chamber 10.
  • the preheater 62 is a heat exchanger such as an economizer, and preheats water by sensible heat of the circulating cooling gas flowing through the third duct 60, and the preheated water is supplied to the boiler 30 as water for generating steam.
  • the chamber 10 is provided with a pre-chamber 12 for temporarily storing red hot coke fed through the coke input device 13, and communicates with the pre-chamber 12 to cool the red hot coke with the circulating cooling gas blown into the chamber 10. And a cooling chamber 11. Further, the chamber 10 has a ring duct 15 that is provided outside and above the cooling chamber 11, communicates with the cooling chamber 11, and communicates with one end of the primary duct 40. Further, the chamber 10 has a coke discharging device 14 that discharges coke cooled by the circulating cooling gas to the outside of the chamber 10 at a position below the cooling chamber 11.
  • the circulating cooling gas blown into the cooling chamber 11 is a low-temperature gas of, for example, about 150 ° C.
  • the circulating cooling gas comes into contact with red-hot coke while flowing upward in the X8 direction, and the temperature rises to about 800 to 900 ° C. Then, the circulating cooling gas whose temperature has been increased flows into the first duct 40.
  • the second duct 50 extending upward from the top of the cyclone 20 has a rising portion 51 rising upward, and a horizontal portion 52 bent from the rising portion 51 and extending in the horizontal or substantially horizontal direction.
  • the rising portion 51 of the second duct 50 communicates with an air introduction duct 53 having an on-off valve 53a.
  • the air introduction duct 53 may have an air introduction system that has a blower (not shown) and forcibly introduces outside air, in addition to an air introduction system that naturally introduces outside air.
  • the circulating cooling gas at about 800 to 900 ° C. flows into the dust collector 20, and most of the coke dust contained in the circulating cooling gas is collected by the cyclone dust collector 20, and after dust removal. Circulating cooling gas is introduced into the second duct 50.
  • Air is introduced into the second duct 50 in the Y1 direction via the air introduction duct 53, and the introduced air is supplied to the circulating cooling gas flowing through the second duct 50.
  • the circulating cooling gas is a gas that contains nitrogen as a main component and also contains unburned H 2 and CO in addition to CO 2 and H 2 O.
  • the temperature of the circulating cooling gas is raised to about 1000 ° C., such as unburned H 2 and CO is completely burned.
  • the amount of heat recovered by the boiler 30 can be increased.
  • the temperature of the circulating cooling gas introduced into the dust collector 20 is suppressed to about 900 ° C. or less, and the temperature of the circulating cooling gas is increased to about 1000 ° C. downstream of the gas flow of the dust collector 20, so that the dust is collected in the dust collector 20. It becomes possible to apply a highly efficient cyclone.
  • the boiler 30 has a water cooling wall 31, and inside the water cooling wall 31, an economizer heat transfer tube 33 forming an economizer and an evaporator heat transfer tube 34 forming an evaporator. And a primary superheater heat transfer tube 35 forming a primary superheater, a secondary superheater heat transfer tube 36 forming a secondary superheater, and a steam separator drum 37.
  • Each of the heat transfer tubes 33, 34, 35, 36 forms a meandering channel, and the heat transfer tubes 33, 34, 35 communicate with a steam-water separation drum 37 via a communication tube 39.
  • the primary superheater heat transfer tube 35 and the secondary superheater heat transfer tube 36 communicate with each other via a connection tube 35A via a header 38 that forms a fluid distribution mechanism.
  • Each of the heat transfer tubes 33, 34, 35 and the communication tube 39 are connected via a header 38.
  • Each of the heat transfer tubes 33, 34, 35, 36 is suspended and fixed by a suspension tube 32 extending vertically from the ceiling of the boiler 30.
  • high-temperature circulating cooling gas of about 1000 ° C. is introduced in the X4 direction from the ceiling side through the second duct 50, and sensible heat of the circulating cooling gas is transferred to each heat transfer tube in the course of flowing down the boiler 30 inside. After being supplied to 33, 34, 35, and 36, the circulating cooling gas is discharged to the third duct 60 in the X5 direction.
  • the water for steam generation preheated by the preheater 62 is introduced into the boiler 30 in the Z1 direction, the water is further preheated by the economizer heat transfer pipe 33, and steam and water is passed through the communication pipe 39 in the Z2 direction. It is sent to the separation drum 37. Water for steam generation is sent from the steam separator drum 37 to the evaporator heat transfer tube 34 in the Z3 direction via the communication tube 39, and steam is generated in the evaporator heat transfer tube 34. It is sent to the steam separator drum 37 in the Z4 direction.
  • the steam sent from the steam separator drum 37 to the primary superheater heat transfer tube 35 in the Z5 direction via the connecting tube 39 is superheated in the process of flowing to the secondary superheater heat transfer tube 36 in the X6 direction via the connection tube 35A. Turns into steam.
  • the superheated steam produced by the boiler 30 is discharged from the secondary superheater heat transfer tube 36 in the Z7 direction via a steam discharge tube (not shown).
  • the steam discharge pipe communicates with a turbine generator (not shown), and the turbine generator generates power using superheated steam introduced from the boiler 30.
  • the temperature of the circulating cooling gas from which heat has been removed in the course of flowing through the boiler 30 has dropped to, for example, about 200 ° C.
  • the low-temperature circulating cooling gas flows through the third duct 60, and is supplied with velocity energy by a blower 61 provided at an intermediate position of the third duct 60, and further flows through the third duct 60. That is, the circulation of the circulating cooling gas at a constant speed in the system of the coke dry fire extinguishing equipment 100 is ensured by the application of the speed energy from the blower 61.
  • a bypass duct 63 different from the third duct 60 extends from the preheater 62 and communicates with the first duct 40 and the air introduction duct 53.
  • a temperature sensor (not shown) is provided in the second duct 50 or the like, and data measured by the temperature sensor is transmitted to the controller 80.
  • the opening / closing valve 63 a is controlled to be opened by the controller 80 so that the circulating cooling gas flows through the first duct through the bypass duct 63.
  • the circulating cooling gas is supplied to the air introduction duct 53 in the X9 ′ direction, and further supplied to the second duct 50.
  • the supply of the circulating cooling gas through the bypass duct 63 in this manner allows the circulating cooling gas to flow into the boiler 30, for example. Can be controlled to a predetermined temperature (range). By controlling the temperature of the circulating cooling gas flowing into the boiler 30 to a predetermined temperature (range) in this way, the temperature of the circulating cooling gas supplied to the boiler 30 is stabilized, and the temperature of the heat transfer tubes and the like constituting the boiler 30 is increased. Breakage and deterioration are prevented.
  • a low-temperature circulating cooling gas is supplied to both the first duct 40 and the second duct 50 via the air introduction duct 53 by the bypass duct 63.
  • a configuration in which the circulating cooling gas is supplied to one of the two ducts 50 may be used.
  • a diffusion duct 64 different from the third duct 60 extends from the preheater 62.
  • a pressure sensor (not shown) is provided in the pre-chamber 12, and a signal measured by the pressure sensor is transmitted to the controller 80.
  • the on-off valve 64a is controlled to be opened by the controller 80, so that part of the circulating cooling gas is diffused out of the system through the radiation duct 64,
  • control can be performed such that the pressure in the pre-chamber 12 falls within a predetermined pressure range.
  • a pressure sensor is provided at an appropriate place in the system, and a unique pressure control value is set in each place, and a signal measured by the pressure sensor exceeds each pressure control value.
  • the on / off valve 64a may be controlled to be opened by the controller 80, and a part of the circulating cooling gas may be released to the atmosphere.
  • the controller 80 includes a CPU (Central Processing Unit) 81, a ROM (Read Only Memory) 82, a RAM (Random Access Memory) 83, an NVRAM (Non-Volatile RAM) 84, and a HDD (Hard Disc Drive). 85 and an input / output port 86, which are interconnected via a bus 87.
  • CPU Central Processing Unit
  • ROM Read Only Memory
  • RAM Random Access Memory
  • NVRAM Non-Volatile RAM
  • HDD Hard Disc Drive
  • the ROM 82 stores various programs, data used by the programs, and the like.
  • the RAM 83 is used as a storage area for loading a program and a work area for the loaded program.
  • the CPU 81 realizes various functions by processing the program loaded in the RAM 83.
  • the NVRAM 84 stores various setting information and the like.
  • the HDD 85 stores programs, various data used by the programs, and the like. For example, in the ROM 82, control values of the temperature and pressure of the circulating cooling gas in each part of the system of the coke dry fire extinguishing system 100 are input.
  • the input / output port 86 inputs and outputs electrical signals to and from each on-off valve, temperature sensor, pressure sensor, and the like.
  • the controller 80 controls the circulation of a predetermined amount of circulating cooling gas in the system of the coke dry fire extinguishing system 100, thereby controlling the system to a predetermined pressure. Further, the temperature, pressure, etc. of the circulating cooling gas at each location in the system are controlled to management values unique to each location. For example, the temperature of the circulating cooling gas is controlled to about 800 to 900 ° C. in the first duct 40 upstream of the gas flow of the cyclone 20 and about 1000 ° C. in the second duct 50 upstream of the gas flow of the boiler 30. Is controlled. In the third duct 60, the temperature is controlled at about 200 ° C. on the upstream side of the gas flow of the preheater 62, and is controlled at about 100 to 150 ° C. on the downstream side of the gas flow of the preheater 62.
  • the coke dust collected by the cyclone 20 has a particle size of about 30 ⁇ m to 5 mm, and when introduced into the boiler 30, has a function of abrading equipment inside the boiler 30.
  • the relatively large particle size of coke dust is introduced into the boiler, causing a problem of wear of internal equipment and the like.
  • the average particle size of the coke dust scattered into the boiler 30 without being collected by the cyclone 20 is in the range of about 20 ⁇ m to 30 ⁇ m, which is much smaller than the coke dust collected by the cyclone 20. The particle size.
  • a part of the relatively large particle coke dust collected by the cyclone 20 adheres to the boiler 30 and accumulates the small particle coke. It was decided to introduce into the boiler 30 as dust for removing coke dust. By aggressively utilizing the wear action of coke dust having a relatively large particle diameter, it adheres to various heat transfer tubes 33, 34, 35, 36, water cooling wall 31, and suspension tube 32 in boiler 30. In this way, it is possible to remove coke dust having a small particle size that has accumulated.
  • a fourth duct 71 extends from the lower end of the cyclone 20, and a classification screen 21 is provided below the fourth duct 71.
  • the classifying screen 21 sorts coke dust having a large particle size range of, for example, about 0.5 mm to 5 mm from a particle size of about 30 ⁇ m to 5 mm. Then, the coke dust having a small particle size range that has not been sorted is sent to a hopper 22 below the classification screen 21 via a discharge duct 71 ′ extending from the classification screen 21, and is temporarily stored, for example, in the hopper. Discharged from 22.
  • the classifying screen 21 may use a screen in which the mesh size of the screen is set in advance, or use a screen in which the mesh size is automatically changed in accordance with the mesh size input to the controller 80. May be.
  • a fourth duct 71 further extends, and the fourth duct 71 has an on-off valve 71a.
  • the on-off valve 71 a is controlled to be opened by the controller 80, for example, coke dust having a large particle size range selected by the classification screen 21 is introduced into the fourth duct 71 extending from below the classification screen 21.
  • a fifth duct 72 having an on-off valve 72 a branches from a position downstream of the gas flow from the blower 61, and the fifth duct 72 communicates with the second duct 50.
  • the fourth duct 71 extending from below the classification screen 21 communicates with the fifth duct 72.
  • the fifth duct 72 communicates with the horizontal portion 52 of the second duct 50 in the illustrated example, the fifth duct 72 may communicate with the rising portion 51 of the second duct 50. Further, although not shown, the fifth duct 72 may directly communicate with the upper space of the boiler 30.
  • the controller 80 stores a control program for causing the flow of the circulating cooling gas in the fifth duct 72 intermittently at predetermined time intervals during the operation of the coke dry fire extinguishing equipment 100. For example, in a continuous operation for 24 hours, control is performed to open and close both the on-off valve 71a of the fourth duct 71 and the on-off valve 72a of the fifth duct 72 every 8 hours, and to keep both of them open for about 10 minutes. Is executed.
  • a part of the coke dust collected and sorted by the cyclone 20 is introduced in the X11 direction through the fourth duct 71, and the circulating cooling gas flowing in the fifth duct 72 in the X12 direction.
  • Coke dust is introduced from the fourth duct 71, and the circulating cooling gas conveys the coke dust to the second duct 50.
  • the coke dust conveyed to the second duct 50 is conveyed to the boiler 30 by the flow of the circulating cooling gas flowing in the second duct 50 in the X3 direction, and supplies the boiler 30 with coke dust having a relatively large particle size. be able to.
  • the coke dust By supplying coke dust having a relatively large particle size to the boiler 30, the coke dust adheres to the various heat transfer tubes 33, 34, 35, and 36, the water-cooling wall 31, the hanging tube 32, and the like in the boiler 30, and accumulates.
  • the small coke dust having a small particle size can be effectively removed.
  • Coke dust having a relatively large particle size has an excellent abrasion effect, but is adhered and accumulated in the boiler 30 by controlling the coke dust to be introduced into the boiler 30 only for a short time of, for example, about 10 minutes. It is possible to avoid abrasion of various devices in the boiler 30 while removing coke dust having a small particle diameter.
  • the supply of the large particle diameter coke dust from the cyclone 20 to the boiler 30 is performed for about 10 minutes, and again, after operating the coke dry fire extinguishing equipment 100 for 8 hours, Again, the supply of coke dust having a large particle size from the cyclone 20 to the boiler 30 is executed for about 10 minutes.
  • the supply of coke dust having a large particle size from the cyclone 20 to the boiler 30 is executed for about 10 minutes.
  • the controller 80 is provided with a timing for controlling the opening and closing of the on-off valves 71a and 72a, and has a coke dust removal mechanism automatically controlled by the controller 80.
  • the opening and closing of the on-off valves 71a and 72a are performed. Manual control in which the control is performed by an administrator may be used.
  • the cyclone 20 does not necessarily have to have the classification screen 21.
  • the coke dust collected by the cyclone 20 generally adheres to the inside of the boiler 30 and has a larger particle diameter than the accumulated coke dust, so that a part of the coke dust collected by the cyclone 20 The coke dust accumulated in the boiler 30 can be sufficiently removed even when the coke dust is used without classification.
  • FIG. 4 is a schematic diagram illustrating a schematic configuration of a coke dry fire extinguishing facility according to the second embodiment.
  • the illustrated coke dry extinguishing equipment 200 has the same basic configuration as the coke dry extinguishing equipment 100 shown in FIG. Therefore, the description of the basic configuration of the coke dry fire extinguishing equipment 200 is omitted, and the mechanism and method for removing coke dust in the boiler will be described.
  • a fourth duct 71 having an on-off valve 71a extends at the lower end of the cyclone 20, and a flow conveyor 91 for transporting coke dust in a horizontal direction is provided below the fourth duct 71, for example.
  • a bucket conveyor 92 for transporting coke dust in the vertical direction is provided at the end of the flow conveyor 91.
  • the coke dust transported to the top by the bucket conveyor 92 is temporarily stored in a storage tank 93.
  • the lower end of the storage tank 93 communicates with a pressurized tank 94 below.
  • An inert gas introduction duct 95 having an on-off valve 95a for introducing an inert gas such as nitrogen gas is communicated with the pressurized tank 94.
  • a sixth duct 96 having an on-off valve 96 a extends from the pressurized tank 94, and the sixth duct 96 communicates with the second duct 50.
  • the sixth duct 96 communicates with the horizontal portion 52 of the second duct 50, but may communicate with the rising portion 51 of the second duct 50.
  • the classified coke dust is discharged through the fourth duct 71 in the X11 direction.
  • unsorted coke dust having a small particle size range for example, is sent to a hopper 22 below the classification screen 21 via a discharge duct 71 ′ extending from the classification screen 21.
  • the coke dust discharged through the fourth duct 71 extending below the classification screen 21 is conveyed in the X14 direction on the flow conveyor 91, then conveyed in the X15 direction on the bucket conveyor 92, and is stored in the storage tank 93. Will be stored.
  • An inert gas is introduced into the pressurized tank 94 through the inert gas introduction duct 95 in the Y2 direction.
  • the coke dust stored in the storage tank 93 is introduced into the pressurized tank 94 in the X16 direction, mixed with an inert gas in the pressurized tank 94, and pressurized.
  • the controller 80 controls the second duct 50 from the pressurized tank 94 via the sixth duct 96 by intermittently controlling the opening and closing of the on-off valve 96 a at predetermined time intervals during the operation of the coke dry fire extinguishing equipment 100.
  • a control program for causing the flow of the inert gas pressurized is stored. For example, in a continuous operation for 24 hours, control is performed to open and close the on-off valve 96a every 8 hours and to keep the open state for about 10 minutes.
  • a part of the coke dust collected and sorted by the cyclone 20 is carried by the inert gas flowing in the X17 direction through the sixth duct 96 to the second duct 50 by airflow.
  • the coke dust conveyed to the second duct 50 is conveyed to the boiler 30 by the flow of the circulating cooling gas flowing in the second duct 50 in the X3 direction, and supplies the boiler 30 with coke dust having a relatively large particle size. be able to.
  • the small particles that adhere to and accumulate on the various heat transfer tubes 33, 34, 35, and 36, the water cooling wall 31, and the hanging tubes 32 in the boiler 30 are also provided. Coke dust having a diameter can be effectively removed.
  • an inert gas is introduced into the pressurized tank 94.
  • a branch duct is branched from the gas flow downstream of the blower 61 in the third duct 60, and this branch duct is connected to the pressurized tank. It may be connected to 94. That is, as in the case of the coke dry fire extinguishing equipment 100 shown in FIG. 1, a mode in which coke dust having a relatively large particle diameter is carried by airflow by using a circulating cooling gas having a high flow velocity energy downstream of the blower 61.
  • the present inventors made the actual operation of the coke dry-type fire extinguishing equipment 100 shown in FIG. 1, introduced large-diameter coke dust collected by the cyclone 20 into the boiler 30, adhered to the inside of the boiler 30, and deposited. An experiment was conducted to remove small particle size coke dust.
  • the coke dry fire extinguishing system 100 is a facility that operates 24 hours a day. The introduction of coke dust into the boiler 30 was performed for 10 minutes every 8 hours of operation. That is, intermittent control of the introduction of coke dust into the boiler 30 was performed three times a day.
  • the coke dust introduced into the boiler 30 was selected from coke dust having a particle size range of about 0.5 mm to 5 mm.
  • a temperature sensor was provided at a position corresponding to a secondary superheater or the like, and data measured by the temperature sensor was received by the controller 80 as needed, and a time-series change in temperature was obtained.

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  • 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 appareil d'extinction d'incendie à coke sec qui peut éliminer la poussière de coke accumulée qui a adhéré dans une chaudière; et un procédé permettant d'éliminer la poussière de coke dans la chaudière de l'appareil d'extinction d'incendie à coke sec. Un appareil 100 d'extinction d'incendie à coke sec comprend une chambre 10, un collecteur 20 de poussière qui comprend un cyclone, une chaudière 30, un premier conduit 40 qui relie la chambre 10 et le cyclone 20, un deuxième conduit 50 qui relie le cyclone 20 et la chaudière 30, et un troisième conduit 60 qui relie la chaudière 30 et la chambre 10, la poussière de coke capturée par le collecteur 20 de poussière étant fournie à la chaudière 30 en tant que poussière d'élimination pour éliminer la poussière de coke qui s'est accumulée dans la chaudière 30.
PCT/JP2019/033281 2018-09-13 2019-08-26 Appareil d'extinction d'incendie à coke sec et procédé d'élimination de poussière de coke dans une chaudière d'appareil d'extinction d'incendie à coke sec WO2020054375A1 (fr)

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JP2018171388A JP6512565B1 (ja) 2018-09-13 2018-09-13 コークス乾式消火設備、及びコークス乾式消火設備のボイラ内のコークスダスト除去方法

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TWI725529B (zh) 2021-04-21
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