CN110538517B - Dry quenching primary dust removal device and dust removal method - Google Patents
Dry quenching primary dust removal device and dust removal method Download PDFInfo
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- CN110538517B CN110538517B CN201910834063.XA CN201910834063A CN110538517B CN 110538517 B CN110538517 B CN 110538517B CN 201910834063 A CN201910834063 A CN 201910834063A CN 110538517 B CN110538517 B CN 110538517B
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- dust removal
- air duct
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/04—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia
- B01D45/06—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by reversal of direction of flow
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/04—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia
- B01D45/08—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by impingement against baffle separators
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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
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- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
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- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
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Abstract
The invention relates to a primary dust removal device for dry quenching, which comprises a primary dust removal air duct and a dust collection groove and is characterized in that a primary dust removal retaining wall is suspended above the dust collection groove, one side of the lower part of the primary dust removal retaining wall facing to an air inlet is provided with a prismatic protrusion, a wind direction conversion baffle is suspended at the top of the air duct at the inlet end of the primary dust removal air duct, the bottom surface of the wind direction conversion baffle is downwards inclined from the inlet end of the primary dust removal air duct to the outlet end of the primary dust removal air duct, a secondary dust removal retaining wall is built at the bottom of the air duct at the outlet end of the primary dust removal air duct, and dust blocking vertical surfaces at two sides of the secondary dust removal retaining wall are obliquely arranged from the outlet end of the primary dust removal air duct to the inlet end of the primary dust removal air duct. The invention prolongs the service life of the dust removal device, can realize that the main dust removal retaining wall of the dry quenching coke does not have collapse accidents in the operation in the annual repair period, and solves the key problem of influencing the annual repair period of the dry quenching coke; meanwhile, the invention can improve the dust removal efficiency of the dust removal system.
Description
Technical Field
The invention relates to the field of coke oven dry quenching production, in particular to a dry quenching primary dust removal device and a dust removal method.
Background
1. Principle of gravity dust removal for dry quenching
The dry quenching technology is beneficial to energy conservation and environmental protection, so the development is fast. The most important parts of the dry quenching device are a dry quenching furnace body and a dust remover. The primary dust removal is to remove coke powder in the circulating inert gas by utilizing the gravity dust removal principle. The main function is to remove dust once. The retaining wall of the primary dust remover mainly has the main function of utilizing the inertia principle, namely, high-temperature inert gas with certain flow rate from the annular flue of the dry quenching furnace collides with the retaining wall due to the fact that the inertia of dust particles is large and the high-temperature inert gas cannot change the direction along with the gas before flowing through the dry quenching coke boiler, and the dust particles (coke powder) fall into the ash discharge groove of the funnel at the bottom cone part of the dust remover under the action of gravity.
2. Reason for damage of dry quenching dust removal retaining wall
The retaining wall of the primary dust remover is of a single-row brick structure, two expansion joints are arranged in the middle of the retaining wall, the dry quenching furnace is heated and cooled, gaps can appear, the gaps do not expand along the preset expansion joints to close, the gaps are under the action of circulating gas, fire clay falls off to cause gas channeling of the retaining wall, the size of the gaps gradually becomes large, refractory materials around the gas channeling are caused, small bricks are loosened and fall off under the action of external force, holes appear, the holes can be gradually enlarged along with the continuous holes in production, and the retaining wall is locally collapsed. From the experience of repair for many years, the parts which fall off firstly are the upper side and the lower side of the processed brick at the middle part of the middle arch.
On one hand, the primary dust removal retaining wall is easy to collapse under the pressure of hot air flow from one side of the dry quenching furnace, when the furnace cover is opened and closed in the normal production of the dry quenching furnace, the pressure of a pre-storage section of the dry quenching furnace is greatly fluctuated, the pressure of a boiler inlet is also fluctuated along with the pressure, the amplitude is almost equivalent to the pressure fluctuation of the pre-storage chamber, the pressure fluctuation is about 200Pa, the pressure before the furnace cover is opened is-1000 Pa at the boiler inlet, the pressure after the furnace cover is opened is-1200 Pa, the pressure fluctuation frequency is consistent with the coke charging frequency, and the period is once every 9 minutes. The area of the retaining wall of the dust remover is about 41.5m2, the impact force of the circulating gas before uncovering is about 3.8 tons, the impact force after uncovering is about 4.7 tons, and the impact force changes once every 9 minutes to form a regular alternating stress, so that the retaining wall is subjected to fatigue failure.
Disclosure of Invention
The invention aims to solve the technical problem of providing a primary dust removal device and a dust removal method for dry quenching, which ensure the safe and stable operation of the dry quenching in an annual repair period.
In order to achieve the purpose, the invention adopts the following technical scheme:
a primary dust removal device for dry quenching comprises a primary dust removal air channel and a dust collection groove, wherein a main dust removal retaining wall is suspended above the dust collection groove, one side, facing the direction of an air inlet, of the lower portion of the main dust removal retaining wall is provided with a prismatic protrusion, a wind direction conversion baffle is suspended at the top of an air channel at the inlet end of the primary dust removal air channel, the bottom surface of the wind direction conversion baffle is arranged from the inlet end of the primary dust removal air channel to the outlet end of the primary dust removal air channel in a downward inclined mode, a secondary dust removal retaining wall is built at the bottom of the air channel at the outlet end of the primary dust removal air channel, and dust blocking vertical surfaces on two sides of the secondary dust removal retaining wall are arranged from the outlet end of the primary dust removal air channel to the inlet end of the primary dust removal air channel in an inclined mode.
The wind direction conversion baffle be pouring structure, its inside pendant that is equipped with, pendant fixed connection suspends in midair on the roof beam, suspends in midair inside the headwall in wind channel that removes dust once.
The distance between the wind direction shifting board and the inlet of the primary dust removing air duct is 2-5 m,
the bottom surface of the wind direction conversion baffle forms an included angle of 35-45 degrees with the horizontal direction.
The included angle between the vertical surface of the secondary dedusting retaining wall close to one side of the dust collecting groove and the vertical direction is 5-10 degrees, and the included angle between the vertical surface of the secondary dedusting retaining wall far away from one side of the dust collecting groove and the vertical direction is 15-25 degrees.
A primary dust removal method for coke dry quenching comprises the steps of sequentially arranging a wind direction conversion baffle, a main dust removal retaining wall and a secondary dust removal retaining wall in a primary dust removal air duct, wherein the wind direction conversion baffle changes the direction of wind on the upper part of the primary dust removal air duct, so that the wind which is parallel to the horizon blows downwards in a direction of 35-45 degrees obliquely after passing through the wind direction conversion baffle, the dust-containing gas on the lower part is stressed in an oblique direction to remove dust in hot inert dust-containing gas, the wind blows towards the edge-shaped protrusions of the main dust removal retaining wall after changing the direction of the wind, the dust in the hot inert dust-containing gas is removed again, the wind which hits the wall surface of the main dust removal retaining wall flows downwards obliquely, and the dust in the hot inert dust-containing gas is removed again after passing through the secondary dust removal retaining wall which is oblique to the direction of an inlet of the air duct.
Compared with the prior art, the invention has the beneficial effects that:
the invention avoids the stress of air duct wind on the weak part of the main dedusting retaining wall, slows down the damage of the main dedusting retaining wall, prolongs the service life of the dedusting device, can realize that the main dedusting retaining wall of the dry quenching coke does not have collapse accidents in the operation in the annual repair period, and solves the key problem of influencing the annual repair period of the dry quenching coke; meanwhile, the invention can improve the dust removal efficiency of the dust removal system, and the dust content is controlled to be not more than 5g/m after the original dust removal3Reduced to 3g/m3In the following, the stable operation of the boiler is protected, and the production efficiency of the dry quenching system is improved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic view of the installation of the wind direction changing baffle.
Fig. 3 is an installation sectional view of the wind direction conversion flap.
In the figure: the device comprises a primary dust removal air duct 1, a dust collection groove 2, a main dust removal retaining wall 3, a wind direction conversion baffle 4, a secondary dust removal retaining wall 5, a suspension beam 6, a hanging piece 7 and a prismatic protrusion 8.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
referring to fig. 1-3, a primary dust removing device for dry quenching comprises a primary dust removing air duct 1 and a dust collecting groove 2, wherein a main dust removing retaining wall 3 is suspended above the dust collecting groove 2, and one side of the lower part of the main dust removing retaining wall 3 facing to the air inlet direction is provided with a prismatic protrusion 8.
A wind direction conversion baffle 4 is suspended at the top of an air duct at the inlet end of a primary dust removal air duct 1, the wind direction conversion baffle 4 is of a pouring structure, a suspension beam 6 is arranged at a position (the position of the primary dust removal emergency relief valve is passed) 2-5 m away from the inlet of the primary dust removal air duct 1, 3 rows of pendants 7 are welded on the suspension beam 6, the pendants 7 and the suspension beam 6 are welded in a full-weld mode, the connection is firm, and the wind direction conversion baffle 4 is durable. After the pendant 7 is welded, an aluminum silicate fiber felt is used for filling and sealing, and 2-3 layers of materials are filled and then compacted, so that high-temperature gas is prevented from entering a welding part to be burnt. And (4) manufacturing a pouring mold after tight filling, wherein the manufacturing of the mold is divided into two times. Firstly, manufacturing a mould for lining pouring materials. The lining pouring material has the functions of sealing and heat insulation, and the space height vacated by the manufacturing of the suspension beam 6 is filled, so that the manufacturing of the lining pouring material die is consistent with the top wall of the primary dust removal air duct 1. The inner lining is cast by heat-insulating light casting material CL-100, and the outer layer, namely the working surface layer, adopts high-strength CZH027 for casting, wear resistance and shock resistance. The bottom surface of the wind direction conversion baffle 4 is downwards inclined from the inlet end of the primary dust removing air duct to the outlet end of the primary dust removing air duct, and the included angle between the bottom surface and the horizontal direction is 35-45 degrees. The height of the wind direction conversion baffle 4 is 500-800 mm, the width is equal to the width of the primary dust removal air duct, and the thickness is 300-400 mm.
And a secondary dedusting retaining wall 5 is built at the bottom of the air duct at the outlet end of the primary dedusting air duct 1, the distance between the secondary dedusting retaining wall 5 and the dust collecting groove 2 is 150-300 mm, and the height of the secondary dedusting retaining wall 5 is 800-1000 mm. The two sides of the secondary dust-removing retaining wall 5 are provided with dust-blocking vertical surfaces which are inclined from the outlet end of the primary dust-removing air channel to the inlet end of the primary dust-removing air channel. The included angle between the vertical surface of the retaining wall close to one side of the dust collecting groove 2 and the vertical direction is 5-10 degrees, and the included angle between the vertical surface of the retaining wall far away from one side of the dust collecting groove and the vertical direction is 15-25 degrees.
A dust removal method of a dry quenching primary dust removal device is characterized in that a wind direction conversion baffle 4, a main dust removal retaining wall 3 and a secondary dust removal retaining wall 5 are sequentially arranged in a primary dust removal air duct 1, the wind direction conversion baffle 4 changes the direction of wind on the upper portion of the primary dust removal air duct 1, so that the wind which is parallel to the horizontal line 2m/s and passes through the wind direction conversion baffle 4 is blown downwards in an inclined direction of 35-45 degrees, the dust-containing gas on the lower portion is forced in the inclined direction to remove dust in the hot inert dust-containing gas, the air is blown to the prismatic protrusions 8 of the main dust removal retaining wall 3 after the air flow changes the direction, the weakest portion of the main dust removal retaining wall 3 is avoided, and the dust in the hot inert dust-containing gas is removed again. The impact force of the airflow on the main dedusting retaining wall is 1.6 kg.m/s2-2.5kg·m/s2。
Striking at the main partThe air flow on the wall surface of the dust retaining wall flows downwards in an inclined way, and the dust in the hot inert dust-containing gas is removed again through the secondary dust-removing retaining wall 5 which is inclined towards the inlet direction of the air duct, so that the dust falls into the dust collecting tank after being blocked by the secondary dust-removing retaining wall 5, and the dust content is measured to be 2.5-4.5g/m before entering the inlet of the boiler after the dust is removed by the method31.5g/m lower than the prior device and method3-3g/m3。
The foregoing is considered as illustrative only of the principles of the invention and is not to be in any way limiting, since all equivalent changes and modifications are intended to be included within the scope of the appended claims.
Claims (1)
1. A dry quenching primary dust removal device comprises a primary dust removal air duct and a dust collection groove, and is characterized in that a primary dust removal retaining wall is suspended above the dust collection groove, one side of the lower part of the primary dust removal retaining wall facing to the direction of an air inlet is provided with a prismatic protrusion, a wind direction conversion baffle is suspended at the top of the air duct at the inlet end of the primary dust removal air duct, the bottom surface of the wind direction conversion baffle is downwards inclined from the inlet end of the primary dust removal air duct to the outlet end of the primary dust removal air duct, a secondary dust removal retaining wall is built at the bottom of the air duct at the outlet end of the primary dust removal air duct, and dust blocking vertical surfaces at two sides of the secondary dust removal retaining wall are inclined from the outlet end of the primary dust removal air duct to the inlet end of the primary dust removal air duct; the wind direction conversion baffle is of a pouring structure, a hanging piece is arranged in the wind direction conversion baffle, the hanging piece is fixedly connected to a suspension beam, and the suspension beam is fixedly connected to the inside of a top wall of the primary dust removal air duct; the distance between the wind direction shifting plate and the inlet of the primary dust removal air duct is 2-5 m; the included angle between the bottom surface of the wind direction conversion baffle and the horizontal direction is 35-45 degrees; the included angle between the vertical surface of the secondary dedusting retaining wall close to one side of the dust collecting groove and the vertical direction is 5-10 degrees, and the included angle between the vertical surface of the secondary dedusting retaining wall far away from one side of the dust collecting groove and the vertical direction is 15-25 degrees; the device removes dust according to the following method, a wind direction conversion baffle, a main dust removal retaining wall and a secondary dust removal retaining wall are sequentially arranged in a primary dust removal air duct, the wind direction conversion baffle changes the direction of wind on the upper portion of the primary dust removal air duct, the wind which is parallel to the horizon is blown downwards in a 35-45-degree direction obliquely after passing through the wind direction conversion baffle, the dust-containing gas on the lower portion is forced in an oblique direction to remove dust in the hot inert dust-containing gas, the air flow is blown to the edge-shaped protrusions of the main dust removal retaining wall after changing the direction of the air flow, the dust in the hot inert dust-containing gas is removed again, the air flow which is hit on the wall surface of the main dust removal retaining wall flows downwards obliquely, and the dust in the hot inert dust-containing gas is removed again after passing through the secondary dust removal retaining wall which is oblique to the direction of the inlet of the air duct.
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| CN201910834063.XA CN110538517B (en) | 2019-09-04 | 2019-09-04 | Dry quenching primary dust removal device and dust removal method |
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| CN201910834063.XA CN110538517B (en) | 2019-09-04 | 2019-09-04 | Dry quenching primary dust removal device and dust removal method |
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| CN110538517B true CN110538517B (en) | 2021-08-20 |
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| CN110819362A (en) * | 2019-12-17 | 2020-02-21 | 中冶焦耐(大连)工程技术有限公司 | Put out stove dust removal structure futilely |
| CN111253957A (en) * | 2020-02-28 | 2020-06-09 | 鞍钢股份有限公司 | Method for discharging ash at high material level by dry quenching primary dust removal |
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