WO2020009137A1 - Équipement d'extinction à sec de coke - Google Patents

Équipement d'extinction à sec de coke Download PDF

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Publication number
WO2020009137A1
WO2020009137A1 PCT/JP2019/026407 JP2019026407W WO2020009137A1 WO 2020009137 A1 WO2020009137 A1 WO 2020009137A1 JP 2019026407 W JP2019026407 W JP 2019026407W WO 2020009137 A1 WO2020009137 A1 WO 2020009137A1
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WO
WIPO (PCT)
Prior art keywords
coke
repose
sloping
exhaust gas
repose surface
Prior art date
Application number
PCT/JP2019/026407
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English (en)
Japanese (ja)
Inventor
大原尚通
Original Assignee
大原尚通
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 大原尚通 filed Critical 大原尚通
Publication of WO2020009137A1 publication Critical patent/WO2020009137A1/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 for cooling coke.
  • FIG. 1 shows the entire equipment.
  • Coke dry fire extinguishing equipment is installed in steelworks, etc., and gradually cools and extinguishes red hot coke carbonized in a coke oven with circulating gas to improve coke quality and recover energy such as power generation.
  • the exhaust gas passes through the sloping flue 3 and is conveyed to the boiler side.
  • the exhaust gas is mainly a cooling gas passing through the cooling chamber 2, but also includes a combustion gas generated from coke in the pre-chamber 1.
  • the exhaust gas passes through a dust removal facility 9 to contain coke powder, and is circulated again to a lower portion of the cooling chamber 2 after energy recovery in a boiler facility 10.
  • the sloping flues 3 are arranged radially from the upper part of the cooling chamber 2 to the ring duct 8 in order to convey the exhaust gas to the boiler side.
  • the side surface of the sloping flew 3 is constituted by a partition wall 5 that supports the pre-chamber inner cylinder 4.
  • FIG. 2 is a cross section of the sloping flute.
  • the high-temperature coke introduced into the pre-chamber 1 gradually descends, and a part of the coke is deposited in the sloping flue 3. Then, it returns to the cooling chamber 2 and descends. Inside the sloping flue 3, the coke layer is gradually replaced to maintain a repose angle and form a slope (hereinafter referred to as a repose surface 6).
  • the sloping flute entrance 7 is at a height below the repose level 6.
  • the cooling gas After the cooling gas is blown into the lower part of the cooling chamber 2, it rises in the gap of the coke layer in the cooling chamber 2, further passes through the gap of the coke layer in the sloping flue 3, and then blows out from the resting surface 6.
  • the combustion gas generated from the coke in the pre-chamber 1 also blows out from the repose surface 6 together with the cooling gas.
  • a mixture of the cooling gas passing through the cooling chamber 2 and the combustion gas passing through the pre-chamber 1 is the exhaust gas passing through the sloping flue 3, and the total of the cooling gas amount and the combustion gas amount is the exhaust gas amount.
  • the amount of exhaust gas is also the amount of gas ejected from the repose surface 6.
  • the amount of exhaust gas passing through the sloping flue 3 tends to increase because combustion air or external combustion products are introduced into the pre-chamber 2 to promote dry distillation of coke or increase recovery energy. It is in.
  • Vent velocity of repose surface (exhaust gas flow rate) / (repose area)
  • the exhaust gas ejected from the repose surface 6 is deflected in the radial direction of the cooling chamber 2 by the wedge-shaped coke layer sandwiched between the partition walls 5.
  • the flow rate of the exhaust gas becomes smaller as the resting surface 6 becomes more outward from the furnace core. If the amount of exhaust gas is continuously increased, the sloping flue 3 will be blocked with coke at a certain level.
  • the process in which the sloping flue 3 is blocked by coke changes substantially as shown in FIG. (1) Fine powder blown up from the furnace core side of the repose surface 6 where the cooling gas flow rate is high accumulates on the outside of the furnace where the flow rate is low. (2) Coke is deposited on the outside of the furnace at a height exceeding the resting surface 6, and the drift increases. (3) The sloping flue 3 is blocked by vicious circulation of coke deposition and drift.
  • the particle size of coke scattered and conveyed toward the boiler also varies. If the sloping flue 3 is blocked by coke, it will be necessary to stop the equipment for recovery. If large-diameter coke is scattered and conveyed, boiler tubes, dust removal equipment, and other auxiliary equipment will also be damaged, and construction and maintenance costs must be excessive. Further, in order to prevent the above (1) to (3) from occurring during the operation of the facility, the amount of exhaust gas in which coke does not accumulate beyond the repose surface 6 must be suppressed in advance.
  • the repose surface length W (FIG. 2)
  • the average value of the repellent flow velocity at the repose surface can be reduced, but the area outside the furnace where the flow velocity is small increases, and the wind-up effect is small and the drift is increased.
  • Increasing the resting surface length W increases the size of the partition wall 5 and supports the pre-chamber inner cylinder 4. Since the structure is a tiled structure, the brittleness increases and the maintenance load increases. For example, the coke quality and the amount of recovered energy are reduced due to an increase in the stoppage time of the equipment, or the work load and the repair cost for reloading the partition wall and the tile every time the equipment is stopped.
  • Japanese Patent Publication No. 03-120536 describes a structure in which the sloping flue 3 is divided into a plurality of upper and lower stages to reduce the coke layer to rest.
  • PCT / JP2008 / 068582 discloses an invention in which the lower end of the entrance of the sloping flues 3 is arranged on the furnace core side to create a space where the coke in the sloping flues is discharged and filled.
  • the present invention is based on such a background, and a first object of the present invention is to eliminate the limitation of the exhaust gas flow rate of the sloping flute without increasing the construction cost and maintenance cost of the partition wall, and to reduce the gas emission amount. To increase coke cooling capacity and energy recovery capacity.
  • a second object is to control the particle size of coke scattered and conveyed while keeping the flow rate of exhaust gas stable, and to suppress the wear resistance cost on the boiler side.
  • An object of the present invention is to eliminate a resting surface from a sloping flu that is first restricted by a cooling gas flow rate. Eliminating the flow rate limitation of the sloping flue and preventing the blockage of coke will increase the amount of exhaust gas.
  • a second problem is to suppress drift on the repose surface, which is a classification point of coke scattered and conveyed to the boiler side. If the drift can be suppressed, the particle size of coke scattered and conveyed to the boiler side can be controlled stably even if the exhaust gas is increased, the abrasion resistance costs of the boiler equipment and the dust removal equipment can be reduced, and the construction and maintenance costs can be reduced. Will be possible.
  • FIG. 1 A cross section of the structure of the present invention is shown in FIG. It is desirable that the area from the upper end 21 of the repose surface at the lower part of the pre-chamber inner cylinder to the lower end 22 of the repose surface on the inner side surface of the cooling chamber has a repose surface length W, and the repose surface is formed in a ring shape.
  • a space is provided between the partition wall and the resting surface, and the sloping flue entrance is located at the height from the repose surface upper end 21 to the repose surface lower end 22, and each sloping flue entrance is located between the repose surface and the partition wall. It is desirable to communicate in space.
  • the exhaust gas After passing through the gap of the coke layer in the pre-chamber or the cooling chamber, the exhaust gas blows out from the ring-shaped repose surface where drift is significantly suppressed, without receiving the ventilation resistance of the coke layer from the sloping flue. It is discharged to the boiler side.
  • the coke gradually descends from the pre-chamber, forms a ring-shaped repose surface without entering the sloping flue, and then descends from the cooling chamber.
  • the repose area of the present invention is desirably determined from the flow velocity of the gas discharged from the repose surface and the flow rate of the exhaust gas based on the large particle size of the coke scattered and conveyed to the boiler side. It is desirable that the repose area be large enough not to exceed the terminal velocity of the large particle size of the coke scattered and conveyed to the boiler side.
  • FIG. 6 shows a plan image of the ring-shaped repose surface of the present invention. It is desirable to secure the strength and durability of the partition wall while securing the necessary area as described above. Therefore, since there is no division by the partition wall and the drift of the repose surface is remarkably suppressed, it is desirable that the repose surface length W be significantly reduced as compared with the conventional art. It is desirable to shorten the length W of the repose surface while securing a repose area that does not exceed the terminal speed of the large particle size of the coke scattered and conveyed to the boiler side.
  • An effect of the present invention is that in a coke dry fire extinguishing system having a pre-chamber and a cooling chamber, the wind speed limitation of the sloping flue is eliminated, and the drift of the exhaust gas on the repose surface can be remarkably suppressed. As a result, the amount of exhaust gas can be increased, and the coke cooling capacity and the energy recovery capacity are improved.
  • shortening the resting surface length W also reduces the length L of the sloping flew, which can be expected to increase the volume of the pre-chamber and reduce the height of the entire equipment.
  • the terminal velocity ut of the large particle diameter d of the coke scattered and conveyed to the boiler side on the repose surface of the coke can be expressed by the following equation.
  • ut d ⁇ 2 ( ⁇ s ⁇ f) * gravity acceleration / (18 ⁇ f) (Re ⁇ 2)
  • ut ⁇ (4/225) * ( ⁇ s ⁇ f) ⁇ 2 * gravity acceleration ⁇ 2 / ( ⁇ f * ⁇ f) ⁇ ⁇ (1/3) * d (2 ⁇ Re ⁇ 500)
  • ut ⁇ (4/3 / 0.44) * ( ⁇ s ⁇ f) * gravity acceleration * d / ⁇ f ⁇ ⁇ (1/2) (500 ⁇ Re ⁇ 10 ⁇ 5)
  • Re (d * ut * ⁇ f) / ⁇ f ⁇ f: exhaust gas density
  • ⁇ s coke density
  • ⁇ f exhaust gas viscosity
  • the terminal speed ut is expressed by the above-mentioned third equation. Therefore, since the exhaust gas density ⁇ f and the coke density ⁇ s are determined by fixed values, the terminal velocity ut can be obtained by determining the large particle diameter d.
  • the resting surface may be arranged in a plurality of upper and lower stages.
  • the height of the sloping flute inlet be limited to the height of the upper end of the repose surface.
  • the lower end of the sloping flu inlet be limited to the height of the resting surface lower end.
  • a part or all of the thickness of the pre-chamber inner cylinder may be stacked directly above the cooling chamber and the tile thickness in the vertical direction. This can be expected to increase the volume of the pre-chamber or reduce the height of the entire equipment.
  • a plurality of partition walls may be extended below the repose surface and a ring-shaped repose surface may be divided into a plurality of portions as in the related art.
  • the upper and lower surfaces of the partition wall may be chamfered, and the inlet / outlet opening of the sloping flue may be bell-mouthed to reduce the pressure loss of the exhaust gas flow.
  • the arrangement of the cooling chamber inlet in the circumferential direction may be changed between the repose surface and the sloping flue inlet within a range in which the lifting of the coke powder due to the horizontal wind pressure of the exhaust gas on the repose surface can be ignored.
  • the resting surface and the sloping flue inlet need not be arranged evenly around the cooling chamber.
  • the present invention is applied to a coke dry fire extinguishing system, but in general, from any height of a powder packed bed in a tower, a fluid that has passed through a void in a powder is discharged out of the system from a repose surface.
  • the present invention can also be used for collecting generated gas accompanying scattering and transport of molded coal powder having a grain size smaller than or equal to the boundary particle size from the height of the middle stage of the shaft furnace of the molded coke making machine.
  • the present invention can be applied to a case where a fluid is discharged from a side surface of a powder packed bed and a large particle size of powder scattered and transported by the fluid is set.

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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

Le problème décrit par la présente invention concerne la fourniture d'un équipement d'extinction à sec de coke qui permet d'augmenter les gaz d'échappement d'un carneau incliné et de réguler le diamètre des particules de coke diffusés et transportés vers une chaudière, et qui permet d'améliorer la qualité du coke et d'effectuer une récupération d'énergie de manière stable. La solution selon l'invention porte sur un espace prévu entre une paroi de séparation 5 et une surface de repos 6 pour exclure une surface de repos de coke du carneau incliné et pour réguler particulièrement la dérive de pulvérisation du gaz d'échappement sur la surface de repos, une surface de repos annulaire étant formée le long d'une paroi à l'intérieur d'une chambre de refroidissement au-dessous d'une entrée de carneau incliné 7. De plus, la zone de la surface de repos annulaire est réglée sur la base du diamètre maximal des particules de la poudre de coke qui est diffusée et transportée vers la chaudière.
PCT/JP2019/026407 2018-07-06 2019-07-03 Équipement d'extinction à sec de coke WO2020009137A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018128938A JP6518860B1 (ja) 2018-07-06 2018-07-06 コークス乾式消火設備
JP2018-128938 2018-07-06

Publications (1)

Publication Number Publication Date
WO2020009137A1 true WO2020009137A1 (fr) 2020-01-09

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PCT/JP2019/026407 WO2020009137A1 (fr) 2018-07-06 2019-07-03 Équipement d'extinction à sec de coke

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JP (1) JP6518860B1 (fr)
WO (1) WO2020009137A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02115546U (fr) * 1989-03-02 1990-09-17
JPH02118734U (fr) * 1989-03-10 1990-09-25

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02115546U (fr) * 1989-03-02 1990-09-17
JPH02118734U (fr) * 1989-03-10 1990-09-25

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JP6518860B1 (ja) 2019-05-22
JP2020007439A (ja) 2020-01-16

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