CN111068446A - Sintering flue gas circulation system and ash removal method thereof - Google Patents
Sintering flue gas circulation system and ash removal method thereof Download PDFInfo
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- CN111068446A CN111068446A CN201911380965.7A CN201911380965A CN111068446A CN 111068446 A CN111068446 A CN 111068446A CN 201911380965 A CN201911380965 A CN 201911380965A CN 111068446 A CN111068446 A CN 111068446A
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- flue
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2003/00—Type of treatment of the charge
- F27M2003/04—Sintering
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Abstract
The invention belongs to the technical field of flue gas treatment in the steel industry, and particularly relates to a sintering flue gas circulating system and a deashing method of the sintering flue gas circulating system. The sintering flue gas circulation system mainly comprises a sintering machine trolley, a flue gas sealing cover, an air box flue, an air box outlet flue, an air box bypass flue, a sintering machine main flue, a circulation flue and a bag-type dust remover. The ash removal method of the sintering flue gas circulation system comprises the steps of arranging flue grid bars in a flue of an air box, and intercepting particulate matters in flue gas; the bag-type dust collector is arranged on the circulating flue to remove fine particles in the flue gas; and a first ash bucket is arranged on the air box flue, a second ash bucket is arranged on the circulating flue, and a third ash bucket and a fourth ash bucket are arranged on the air box outlet flue to collect the particulate matters. The invention can prolong the service time of the sintering flue gas circulation system, reduce the workload and difficulty of maintenance, and prevent sintering machine trolley grate bars from being blocked to influence sintering production.
Description
Technical Field
The invention belongs to the technical field of flue gas treatment in the steel industry, and particularly relates to a sintering flue gas circulating system and a deashing method of the sintering flue gas circulating system.
Background
The discharge amount of pollutants in the sintering process in the steel industry is large, and a sintering flue gas circulation technology is taken as an important mode for reducing the discharge amount of the pollutants, and various circulation processes are proposed at home and abroad. Wherein LEEP (Low Emission energy Optimized Sintering process), Eposint (abbreviation of environmental Optimized Sintering, meaning: environmental Optimized Sintering), EOS (abbreviation of Emission Optimized Sintering, meaning: energy Optimized Sintering technology) and New day iron (regional exhaust gas circulation process) are available abroad; enterprises such as China's steel, sand steel, first steel stock, Bao steel, Yong steel, migrating steel, long steel and the like are respectively implemented.
Due to the characteristics of the sintering flue gas, the following problems generally exist in the application process of the sintering flue gas circulation technology:
1. the concentration of the particulate matters contained in the sintering flue gas is high (can reach 5 g/Nm)3Left and right) and the multi-tube cyclone dust collector commonly adopted at present can only remove large particles, so that the dust removal efficiency of fine particles is low, the residual particles in the sintering flue gas are more, and the flue and the fan are seriously abraded.
2. The particle size distribution range of particles in the sintering flue gas is wide, the particles are distributed from the micron level and the millimeter level to the centimeter level, even the whole sintering ore drops into a flue or equipment of a sintering flue gas circulation system, and the particles are easy to block at a flue elbow, a valve, an expansion joint and the like, so that the normal operation of the system is influenced, and the overhauling workload and difficulty are increased.
3. The fine particles of the sintering flue gas have high contents of alkali metals and alkaline earth metals such as potassium, sodium, zinc and the like, so that the viscosity of the particles is increased, the particles are easy to adhere to a flue or equipment of a sintering flue gas circulation system, particularly, the phenomenon that small particles adhere to a grate bar of a sintering trolley along with the circulation flue gas is easy to occur, and the low-melting-point particles are melted and solidified on the grate bar at a sintering high temperature, so that the color of the grate bar is whitened, the hardness of the grate bar is brittle, and gaps among the grate bars are reduced until the grate bar is blocked and difficult to clean. The more and more serious the grid bars are blocked, the air permeability of a sinter bed is deteriorated, the load of a main sintering exhaust fan is increased, the power consumption of a motor is increased, and finally the sintering production is seriously influenced.
Disclosure of Invention
The invention provides a sintering flue gas circulating system and a dust removing method of the sintering flue gas circulating system, which can solve the technical problem that particulate matters in sintering flue gas are difficult to treat.
In order to solve the problems, the invention provides a sintering flue gas circulation system and a deashing method thereof, and the technical scheme is as follows:
a sintering flue gas recirculation system comprising: the device comprises a sintering machine trolley, a smoke sealing cover, an air box flue, an air box outlet flue, an air box bypass flue, a sintering machine main flue, a circulating flue and a bag-type dust collector; the flue gas sealing cover is arranged on the sintering machine trolley; one end of the air box flue is connected with the sintering machine trolley, and the other end of the air box flue is respectively connected with one end of the air box outlet flue and one end of the air box bypass flue; one end of the circulating flue is connected with the other end of the air box outlet flue, and the other end of the circulating flue is connected with the flue gas sealing cover; one end of the main flue of the sintering machine is connected with the other end of the bypass flue of the air box, and the other end of the main flue of the sintering machine is used for discharging flue gas outwards; the bag-type dust collector is arranged on the circulating flue.
The sintering flue gas circulation system as described above is further preferably: the air box flue comprises a left branch flue and a right branch flue, and the left branch flue and the right branch flue are symmetrically arranged; the main flue of the sintering machine comprises a left main flue and a right main flue, the left branch flue is connected with the left main flue through the air box bypass flue, and the right branch flue is connected with the right main flue through the air box bypass flue; the air box outlet flue comprises a horizontal communication flue and an inclined outlet flue, one end of the horizontal communication flue is connected with the left branch flue and the air box bypass flue, and the other end of the horizontal communication flue is respectively connected with the right branch flue and the air box bypass flue; one end of the inclined outlet flue is connected with the left branch flue, the air box bypass flue and the horizontal communication flue respectively, and the other end of the inclined outlet flue is connected with the circulating flue.
The sintering flue gas circulation system as described above is further preferably: the device also comprises a first valve, a second valve, a third valve and a fourth valve; the first valve is arranged at the junction of the horizontal communication flue and the inclined outlet flue; the second valve is arranged at the junction of the left main flue and the air box bypass flue; the third valve is arranged on the horizontal communication flue; the fourth valve is installed at the junction of the right main flue and the air box bypass flue.
The sintering flue gas circulation system as described above is further preferably: one end of the air box flue, which is connected with the sintering machine trolley, is provided with a transition section which is obliquely arranged, the transition section is in a horn mouth shape, a flue grid is arranged in the transition section, the flue grid is obliquely arranged, and the included angle between the surface of the flue grid and the horizontal plane is not less than 45 degrees; and a first ash hopper is arranged on the transition section and between the flue grate and the sintering machine trolley, a first ash cleaning hole is formed in the first ash hopper, and the first ash hopper is used for collecting particles intercepted by the flue grate.
The sintering flue gas circulation system as described above is further preferably: the transition section comprises a transition left section and a transition right section; the transition left section is positioned on the left branch flue, and the transition right section is positioned on the right branch flue; the first ash buckets are multiple and are respectively arranged on the transition left section and the transition right section.
The sintering flue gas circulation system as described above is further preferably: and an access manhole door for providing an access window is arranged on the air box flue, and the access manhole door is positioned below the transition section.
The sintering flue gas circulation system as described above is further preferably: the circulating flue is provided with an expansion section, the joint of the air box outlet flue and the circulating flue is positioned at the expansion section, and the expansion section comprises a machine head expansion section and a machine tail expansion section; and a second ash hopper is arranged on the lower side of the expansion section, and a second ash cleaning hole is formed in the second ash hopper.
The sintering flue gas circulation system as described above is further preferably: and a circulating main exhaust fan is further installed on the circulating flue, and the circulating main exhaust fan is positioned between the bag-type dust collector and the flue gas sealing cover.
The sintering flue gas circulation system as described above is further preferably: the circulation flue with link to each other through a plurality of circulation branch pipes between the flue gas sealed cowling, every all be equipped with an governing valve on the circulation branch pipe.
The sintering flue gas circulation system as described above is further preferably: a third ash hopper is arranged at the lower side of the horizontal communication flue, and a third ash cleaning hole is formed in the third ash hopper; and a fourth ash hopper is arranged on the lower side of the inclined outlet flue, and a fourth ash cleaning hole is formed in the fourth ash hopper.
The sintering flue gas circulation system as described above is further preferably: the first ash bucket, the second ash bucket, the third ash bucket and the fourth ash bucket are all connected with an ash conveying pipe, and a manual gate valve and an electric double-layer ash discharge valve are arranged on the ash conveying pipe; the ash conveying pipe is connected with the belt conveyor, and the belt conveyor is externally connected with a sintering machine batching system.
The sintering flue gas circulation system as described above is further preferably: the flue grid comprises transverse ribs and longitudinal ribs, and strip-shaped sieve holes are formed between the transverse ribs and the longitudinal ribs.
The sintering flue gas circulation system as described above is further preferably: the transverse ribs and the longitudinal ribs are connected in a splicing mode or are arranged in an integrated mode, and the transverse ribs and the longitudinal ribs are made of any one of wear-resistant chromium cast iron, high manganese steel, wear-resistant alloy steel and austempered ductile iron.
The sintering flue gas circulation system as described above is further preferably: the main flue of the sintering machine is connected with a chimney, and a machine head electric dust remover, a main sintering exhaust fan, a desulfurization device, a denitration device and an induced draft fan are sequentially installed on the main flue of the sintering machine.
A sintering flue gas circulation system ash removal method is realized based on the sintering flue gas circulation system and comprises the following steps: firstly, after flue gas enters an air box flue from the sintering pallet, flue grid bars are arranged in the air box flue to intercept particulate matters in the flue gas; then, installing the bag-type dust collector on the circulating flue to remove fine particles in the flue gas; and finally, arranging a first ash bucket on the air box flue, a second ash bucket on the circulating flue, and a third ash bucket and a fourth ash bucket on the air box outlet flue to collect the particles.
Analysis shows that compared with the prior art, the invention has the advantages and beneficial effects that:
the invention removes fine particles by arranging the bag-type dust collector; intercepting small sintered ores by arranging flue grates; the transition section, the inclined outlet flue and the expansion section are arranged to deposit the particulate matters in the flue gas, so that the particulate matters in the flue gas can be removed in a grading manner, and the particulate matter removal efficiency is improved; through setting up first ash bucket, second ash bucket, third ash bucket, fourth ash bucket and carrying out cigarette ash collection and recycle in the easy cigarette ash accumulational place of pipeline, adopt so multiple dust removal, the particulate matter in the dust fall means comes the desorption sintering flue gas, can alleviate flue, pipe fitting, valve and equipment wearing and tearing, extension sintering flue gas circulation system's live time reduces maintenance work load and the degree of difficulty, prevents that sintering machine platform truck grid section from blockking up and influencing sintering production.
Drawings
FIG. 1 is a schematic longitudinal connection diagram of a sintering flue gas circulation system.
FIG. 2 is a schematic diagram of the transverse connection of the sintering flue gas circulation system.
Fig. 3 is an enlarged view of a portion a in fig. 2.
Fig. 4 is a schematic structural view of a flue grid.
Fig. 5 is a schematic view of the connection of the second ash bucket with the nose expanding section and the tail expanding section.
In the figure: 1-sintering machine trolley; 2-flue gas sealing cover; 3-adjusting the valve; 4-circulation branch pipe; 5-circulating a flue; 6-circulating the main exhaust fan; 7-bag dust collector; 8-tail expansion section; 9-a nose expansion section; 10-air box outlet flue; 11-main flue of sintering machine; 12-a nose electric dust remover; 13-sintering the main exhaust fan; 14-a desulfurization unit; 15-a denitration device; 16-a draught fan; 17-a chimney; 18-wind box flues; 19-a bellows bypass flue; 20-transition right section; 21-a first ash bucket; 22-right branch flue; 23-horizontally communicating the flue; 24-manhole door; 25-a fourth valve; 26-right main flue; 27-a third ash bucket; 28-a third valve; 29-a second valve; 30-left main flue; 31-a fourth ash bucket; 32-a second ash bucket; 33-an expansion section; 34-inclined outlet flues; 35-a first valve; 36-left branch flue; 37-flue grid section; 38-transition left section; 39-second deashing hole; 40-ash conveying pipe; 41-manual gate valve; 42-electric double-layer ash discharge valve; 43-longitudinal ribs; 44-transverse ribs.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected" and "connected" used herein should be interpreted broadly, and may include, for example, a fixed connection or a detachable connection; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
Referring to fig. 1 to 5, fig. 1 is a schematic longitudinal connection diagram of a sintering flue gas circulation system; FIG. 2 is a schematic view of a transverse connection of a sintering flue gas circulation system; FIG. 3 is an enlarged view taken at A in FIG. 2; FIG. 4 is a schematic view of the structure of a flue grid; fig. 5 is a schematic view of the connection of the second ash bucket with the nose expanding section and the tail expanding section.
As shown in fig. 1, the invention provides a sintering flue gas circulation system, which mainly comprises a sintering pallet 1, a flue gas sealing cover 2, an air box flue 18, an air box outlet flue 10, an air box bypass flue 19, a sintering machine main flue 11, a circulation flue 5 and a bag-type dust collector 7; the flue gas sealing cover 2 is arranged on the sintering machine trolley 1; one end of an air box flue 18 is connected with the sintering machine trolley 1, and the other end of the air box flue is respectively connected with one end of an air box outlet flue 10 and one end of an air box bypass flue 19; one end of the circulating flue 5 is connected with the other end of the air box outlet flue 10, and the other end of the circulating flue 5 is connected with the flue gas sealing cover 2; one end of the main flue 11 of the sintering machine is connected with the other end of the bypass flue 19 of the air box, and the other end of the main flue 11 of the sintering machine is used for discharging flue gas outwards; the bag-type dust collector 7 is arranged on the circulating flue 5.
When the sintering flue gas circulation system provided by the invention operates, flue gas enters the air box flue 18 from the sintering machine trolley 1, and the circulation directions in the air box flue 18 are divided into two types: a flue 10 entering an outlet of an air box enters a circulating flue 5 from the flue 10 at the outlet of the air box and enters a flue gas sealing cover 2 from the circulating flue 5 to realize flue gas circulation; the other enters an air box bypass flue 19, enters a sintering machine main flue 11 from the air box bypass flue 19, and is discharged outside from the sintering machine main flue 11. When the flue gas is circulated, the bag-type dust collector 7 is arranged on the circulating flue 5, so that fine particles with high contents of alkali metals and alkaline earth metals such as potassium, sodium, zinc and the like can be prevented from being adhered to the trolley grate bars of the trolley 1 of the sintering machine along with the flue gas, and the sintering production is influenced or accidents are caused. The bag-type dust collector 7 can remove fine dust, the dust removal efficiency can reach 99.5%, and fine particles in the flue gas can be removed, so that the content of the fine particles is reduced in the flue gas circulation process, the fine particles are prevented from entering a sinter bed, the particles in the flue gas can be effectively treated, and the abrasion and blockage conditions of a sintering flue gas circulation system are relieved.
As an improvement of the present invention, as shown in fig. 1 to 5, the present invention further provides the following modifications:
as shown in fig. 1 and 2, in the present invention, the air box flue 18 includes a left branch flue 36 and a right branch flue 22, and the left branch flue 36 and the right branch flue 22 are symmetrically arranged, that is, symmetrically distributed on the left and right sides of the sintering pallet 1, so as to balance the air pressure on the left and right sides in the sintering pallet 1, and make the suction force of the sintering main exhaust fan 13 on the left and right sides of the sintering pallet 1 consistent; the sintering machine main flue 11 comprises a left main flue 30 and a right main flue 26, a left branch flue 36 is connected with the left main flue 30 through an air box bypass flue 19, a right branch flue 22 is connected with the right main flue 26 through the air box bypass flue 19, flue gas on the left side in the sintering machine trolley 1, which needs to be discharged from the sintering machine main flue 11, is discharged from the left main flue 30, and flue gas on the right side in the sintering machine trolley 1, which needs to be discharged from the sintering machine main flue 11, is discharged from the right main flue 26; the air box outlet flue 10 comprises a horizontal communicating flue 23 and an inclined outlet flue 34, one end of the horizontal communicating flue 23 is connected with the left branch flue 36 and the air box bypass flue 19, and the other end of the horizontal communicating flue 23 is respectively connected with the right branch flue 22 and the air box bypass flue 19, so that a three-way pipeline structure is formed at the right side of the sintering machine trolley 1; one end of the inclined outlet flue 34 is respectively connected with the left branch flue 36, the air box bypass flue 19 and the horizontal communicating flue 23, and the other end of the inclined outlet flue 34 is connected with the circulating flue 5, so that a four-way pipeline structure is formed at the left side of the sintering machine trolley 1; the flue gas which participates in flue gas circulation at the right side in the sintering pallet 1 enters a horizontal communicating flue 23 from a right branch flue 22, then enters an inclined outlet flue 34 from the horizontal communicating flue 23, is discharged into a circulating flue 5 from the inclined outlet flue 34 and enters a flue gas sealing cover 2 for participating in circulation; the flue gas which participates in the flue gas circulation at the left side in the sintering pallet 1 enters the inclined outlet flue 34 from the left branch flue 36, is discharged into the circulation flue 5 from the inclined outlet flue 34 and enters the flue gas sealing cover 2 to participate in the circulation. According to the invention, by arranging the three-way pipeline structure and the four-way pipeline structure, all pipelines can be combined, the flue gas flow path is optimized, the pipeline air pressure is balanced, and the pipeline material consumption is saved.
Further, as shown in fig. 1 and 2, in the present invention, a first valve 35, a second valve 29, a third valve 28 and a fourth valve 25 are further included; the first valve 35 is arranged at the junction of the horizontal communication flue 23 and the inclined outlet flue 34; a second valve 29 is arranged at the junction of the left main flue 30 and the wind box bypass flue 19; the third valve 28 is arranged on the horizontal communication flue 23; a fourth valve 25 is installed at the intersection of the right main flue 26 and the wind box bypass flue 19. When the flue gas circulation is performed (when the flue gas circulation system normally operates), the first valve 35 and the third valve 28 are in an open state, and the second valve 29 and the fourth valve 25 are in a closed state; when the flue gas circulation is not performed (when the flue gas circulation system is closed), the first valve 35 and the third valve 28 are in the closed state, and the second valve 29 and the fourth valve 25 are in the open state. The invention is provided with a first valve 35, a second valve 29, a third valve 28 and a fourth valve 25, and the flow direction of sintering flue gas can be adjusted by adjusting the opening and closing of the four valves, so that the operation state of a flue gas circulation system can be controlled by matching with equipment such as a circulation main exhaust fan 6, a bag-type dust collector 7 and the like, and the operation control is convenient (wherein, the flue gas circulation system is started and kept to operate continuously under the condition that the sintering machine operates normally and the equipment in the flue gas circulation system is normal, and when the sintering machine or the flue gas circulation system operates abnormally and needs to be overhauled, the flue gas circulation system is closed for overhauling).
As shown in fig. 1 and fig. 2, in the present invention, an obliquely arranged transition section is arranged at one end of the bellows flue 18 connected to the sintering pallet 1, and the transition section is in a bell mouth shape, so that when flue gas enters the transition section, the path is suddenly narrowed, which is convenient for the collection of flue gas and is beneficial to the deposition of particulate matters in the flue gas. The transition section is internally provided with a flue grate bar 37, the flue grate bar 37 is obliquely arranged, the included angle between the surface and the horizontal plane is not less than 45 degrees, and the minimum included angle range between the surface of the flue grate bar 37 and the axis of the transition section is 60-90 degrees, so that particles can impact the surface of the flue grate bar 37 and slide down along the surface of the flue grate bar 37, small sintered ores mixed in flue gas are intercepted, and the normal flow of the flue gas is not influenced. Meanwhile, the first ash bucket 21 is arranged on the transition section and between the flue grate bars 37 and the sintering machine trolley 1, and can contain and collect small sintered ores (particulate matters) intercepted by the flue grate bars 37, and the first ash bucket 21 is provided with a first ash cleaning hole, so that the first ash bucket 21 can be cleaned and maintained conveniently.
Further, as shown in fig. 2 and 4, in the present invention, the flue grid 37 includes a transverse rib 44 and a longitudinal rib 43, and a bar-shaped screen hole is provided between the transverse rib 44 and the longitudinal rib 43, so that it can intercept the small sintered ore without affecting the flow of the flue gas. As an alternative, the transverse ribs 44 and the longitudinal ribs 43 may be welded together or cast as a one-piece structure. In terms of material selection, the material can be any one of wear-resistant, corrosion-resistant and high-temperature-resistant materials such as wear-resistant chromium cast iron, high manganese steel, wear-resistant alloy steel, austempered ductile iron and the like.
Further, as shown in FIG. 2, in the present invention, the transition section includes a transition left section 38 and a transition right section 20; the left transition section 38 is positioned on the left branch flue 36, the right transition section 20 is positioned on the right branch flue 22, and the bell mouth orientation and the inclination angle of the left transition section 38 and the bell mouth orientation and the inclination angle of the right transition section 20 are symmetrically arranged; the first ash buckets 21 are multiple, one first ash bucket 21 is installed on each transition left section 38 and each transition right section 20, small sintered ores intercepted by the flue grate bars 37 can be collected conveniently, and the first ash buckets 21 on the transition left section 38 and the first ash buckets 21 on the transition right section 20 are symmetrically arranged.
As shown in fig. 1 and 2, in the present invention, the windbox flue 18 is provided with an access manhole door 24 for providing an access window, the access manhole door 24 being located below the transition section. On the air box flue 18, the part below the transition section is a vertical pipe section, a three-way pipeline structure is arranged below the vertical pipe section, smoke flowing downwards and smoke flowing horizontally leftwards are staggered, airflow turbulence is easy to generate, and particles are easy to adhere to the inner side of the pipe wall at the position and then deposit. In addition, the manhole door 24 is positioned at the position of a three-way pipeline structure, and the deposition condition of particulate matters on the horizontal communication flue 23 and the air box bypass flue 19 can be observed.
As shown in fig. 1 to 3, in the present invention, an expansion section 33 is provided on the circulating flue 5, the connection part of the bellows outlet flue 10 and the circulating flue 5 is located at the expansion section 33, when flue gas enters the expansion section 33 from the bellows outlet flue 10 (inclined outlet flue 34), the flow direction of the flue gas changes, and the pipe diameter of the expansion section 33 is larger than that of the inclined outlet flue 34, so that the flow path suddenly increases, the flow velocity of the flue gas decreases, and the settling of particulate matters in the flue gas is facilitated. A second ash hopper 32 is arranged at the lower side of the expansion section 33 and can collect settled particles; the second ash bucket 32 is provided with a second ash cleaning hole 39, which is convenient for cleaning and maintaining the second ash bucket 32.
It is noted that, as shown in fig. 2 and 5, the expanding section 33 includes a nose expanding section 9 and a tail expanding section 8. The machine head expansion section 9 is connected with a plurality of air box outlet flues 10 positioned at the machine head part of the sintering machine trolley 1, and the machine tail expansion section 8 is connected with a plurality of air box outlet flues 10 positioned at the machine tail part of the sintering machine trolley 1. In the invention, instead of selecting all the part of the flue gas in the length direction of the sintering pallet 1 for circulation, part of the flue gas in the head section and the tail section of the sintering pallet 1 is selectively selected to participate in the flue gas circulation. And the flue gas discharged by the part which is not selected to participate in the flue gas circulation on the sintering machine trolley 1 is directly connected with the main flue 11 of the sintering machine through the air box flue 18.
As known to those skilled in the art, the discharged flue gas of the pallet 1 from the front end to the end can be divided into four types: the first type is high-oxygen, low-temperature, low-dust and low-pollutant flue gas; the second type is high-concentration carbon monoxide and high-concentration nitrogen oxide flue gas; the third type is high-concentration sulfur dioxide flue gas; the fourth type is high oxygen, high temperature, low dust, low pollutant flue gas. The first type of smoke and the fourth type of smoke can be directly discharged after being treated, and the second type of smoke and the third type of smoke are selected for circulation, so that the smoke treatment burden can be reduced. For example, taking a sintering pallet 1 with 23 flues as an example, the flue gas participating in flue gas circulation in the head expansion section 9 of the invention is high-concentration carbon monoxide and high-concentration nitrogen oxide flue gas, and the number of the corresponding flue is 4 to 8; the flue gas participating in flue gas circulation in the tail expansion section 8 of the invention is high-concentration sulfur dioxide flue gas, and the number of the corresponding flue gas channel is 20 to 23.
As shown in fig. 1, in the invention, a circulating main exhaust fan 6 is also installed on the circulating flue 5, and the circulating main exhaust fan 6 is positioned between the bag-type dust remover 7 and the flue gas sealing cover 2, so that the flue gas circulating efficiency can be improved. The circulation flue 5 links to each other through a plurality of circulation branch pipes 4 between the gas seal cover 2, is convenient for circulate the equipartition of flue gas in the gas seal cover 2, all is equipped with an governing valve 3 on every circulation branch pipe 4, is convenient for adjust the air input of circulation flue gas.
As shown in FIG. 2, in the present invention, the horizontal communicating flue 23 is horizontally arranged, the length is about 8 meters, the flow rate of flue gas is slow, and the flue gas is easy to be blocked by deposition of particulate matters, and the third ash bucket 27 is installed at the lower side of the horizontal communicating flue 23, so that the particulate matters deposited in the horizontal communicating flue 23 can be collected. Furthermore, the length of the third ash bucket 27 is matched with that of the horizontally communicated flue 23, and the third ash bucket is long and narrow (about 8 meters in length), so that deposited particles in the whole flue section of the horizontally communicated flue 23 can be collected conveniently; the third ash bucket 27 is provided with a third ash cleaning hole, which is convenient for cleaning and maintaining the third ash bucket 27. The slope export flue 34 is by the right side to left side tilt up, can utilize the inside of downside to block the particulate matter in the flue gas stream passes through the journey, does benefit to the particulate matter and subsides on slope export flue 34, and slope export flue 34 downside adaptation fourth ash bucket 31 can collect the particulate matter, is equipped with the fourth deashing hole on the fourth ash bucket 31, is convenient for clear up the maintenance to fourth ash bucket 31.
Further, as shown in fig. 2 and 3, in the present invention, the first ash bucket 21, the second ash bucket 32, the third ash bucket 27 and the fourth ash bucket 31 are all connected to the ash conveying pipe 40, the ash conveying pipe 40 is connected to the belt conveyor, the belt conveyor is externally connected to the sintering machine batching system, and the collected small sintered ores and particulate matters can be redistributed to the sintering machine trolley 1 for combustion, which is beneficial to the maximum utilization of resources (because the particle size of the ash collected by the bag-type dust collector 7 is small, and the contents of alkali metals and alkaline earth metals such as potassium, sodium, zinc, etc. are high, and are not suitable for being sent to the sintering machine batching system, the bag-type dust-removed ash is transported outside); the ash conveying pipe 40 is provided with a manual gate valve 41 and an electric double-layer ash discharging valve 42, and when in an ash discharging state, the manual gate valve 41 and the electric double-layer ash discharging valve 42 are opened to discharge ash; after the ash discharge is finished, the manual gate valve 41 and the electric double-layer ash discharge valve 42 are closed, when the electric double-layer ash discharge valve 42 is overhauled, the manual gate valve 41 is closed firstly, then the electric double-layer ash discharge valve 42 is detached for overhauling, and thus, the external cold air can be prevented from entering.
As shown in fig. 1, in the present invention, as a means for treating flue gas that does not participate in flue gas circulation, a main flue 11 of a sintering machine is connected to a chimney 17, and an electric dust remover 12 for removing dust from flue gas, a main exhaust fan 13 for sintering, a desulfurization device 14 for desulfurizing flue gas, a denitration device 15 for denitrating flue gas, and an induced draft fan 16 are sequentially installed on the main flue 11 of the sintering machine. The sintering main exhaust fan 13 can continuously suck air above the charge level of the sintering machine into the charge level of the sintering machine to participate in the sintering process, and can apply work to sintering flue gas generated after sintering, so that the flue gas sequentially passes through the air box flue 18 and the air box bypass flue 19 and enters the main flue 11 of the sintering machine; the induced draft fan 16 can do work to the sintering flue gas of sintering main draft fan 13 suction, makes the sintering flue gas pass through desulphurization unit 14, denitrification facility 15, induced draft fan 16 in proper order, until chimney 17.
Meanwhile, as shown in fig. 1 to 5, the invention also provides a sintering flue gas circulation system ash removal method based on the sintering flue gas circulation system, which comprises the following steps: firstly, after flue gas enters an air box flue 18 from a sintering pallet 1, flue grid bars 37 are arranged in the air box flue 18 to intercept particulate matters (mainly small sintered ores) in the flue gas; then, a bag-type dust collector 7 is arranged on the circulating flue 5 to remove fine particles in the flue gas; finally, the first ash hopper 21 is provided in the wind box flue 18, the second ash hopper 32 is provided in the circulation flue 5, and the third ash hopper 27 and the fourth ash hopper 31 are provided in the wind box outlet flue 10, so that the particulate matter is collected.
The ash removal method of the sintering flue gas circulation system can improve the operation condition of the sintering flue gas circulation system and prolong the effective use time of the sintering flue gas circulation system by carrying out classification treatment on large particles (mainly small sintered ores), fine particles and pipeline sediments in sintering flue gas (wherein the particle size of the large particles is 1-5 cm, and is in the centimeter grade, the particle size of the fine particles is in the micrometer grade, and the particle size of the pipeline sediments is in the micrometer grade and is smaller than that of the fine particles).
In conclusion, the bag-type dust collector is arranged to remove fine particles; intercepting small sintered ores by arranging flue grates; the transition section, the inclined outlet flue and the expansion section are arranged to deposit the particulate matters in the flue gas, so that the particulate matters in the flue gas can be removed in a grading manner, and the particulate matter removal efficiency is improved; through setting up first ash bucket, second ash bucket, third ash bucket, fourth ash bucket and carrying out cigarette ash collection and recycle in the easy cigarette ash accumulational place of pipeline, adopt so multiple dust removal, the particulate matter in the dust fall means comes the desorption sintering flue gas, can alleviate flue, pipe fitting, valve and equipment wearing and tearing, extension sintering flue gas circulation system's live time reduces maintenance work load and the degree of difficulty, prevents that sintering machine platform truck grid section from blockking up and influencing sintering production.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (10)
1. A sintering flue gas circulation system, comprising:
the device comprises a sintering machine trolley, a smoke sealing cover, an air box flue, an air box outlet flue, an air box bypass flue, a sintering machine main flue, a circulating flue and a bag-type dust collector;
the flue gas sealing cover is arranged on the sintering machine trolley;
one end of the air box flue is connected with the sintering machine trolley, and the other end of the air box flue is respectively connected with one end of the air box outlet flue and one end of the air box bypass flue;
one end of the circulating flue is connected with the other end of the air box outlet flue, and the other end of the circulating flue is connected with the flue gas sealing cover;
one end of the main flue of the sintering machine is connected with the other end of the bypass flue of the air box, and the other end of the main flue of the sintering machine is used for discharging flue gas outwards;
the bag-type dust collector is arranged on the circulating flue.
2. The sintering flue gas circulation system of claim 1, wherein:
the air box flue comprises a left branch flue and a right branch flue, and the left branch flue and the right branch flue are symmetrically arranged;
the main flue of the sintering machine comprises a left main flue and a right main flue, the left branch flue is connected with the left main flue through the air box bypass flue, and the right branch flue is connected with the right main flue through the air box bypass flue;
the air box outlet flue comprises a horizontal communication flue and an inclined outlet flue, one end of the horizontal communication flue is connected with the left branch flue and the air box bypass flue, and the other end of the horizontal communication flue is respectively connected with the right branch flue and the air box bypass flue; one end of the inclined outlet flue is connected with the left branch flue, the air box bypass flue and the horizontal communication flue respectively, and the other end of the inclined outlet flue is connected with the circulating flue.
3. The sintering flue gas circulation system of claim 2, further comprising:
a first valve, a second valve, a third valve and a fourth valve;
the first valve is arranged at the junction of the horizontal communication flue and the inclined outlet flue;
the second valve is arranged at the junction of the left main flue and the air box bypass flue;
the third valve is arranged on the horizontal communication flue;
the fourth valve is installed at the junction of the right main flue and the air box bypass flue.
4. The sintering flue gas circulation system of claim 2, wherein:
one end of the air box flue, which is connected with the sintering machine trolley, is provided with a transition section which is obliquely arranged, the transition section is in a horn mouth shape, a flue grid is arranged in the transition section, the flue grid is obliquely arranged, and the included angle between the surface of the flue grid and the horizontal plane is not less than 45 degrees;
a first ash hopper is arranged on the transition section and between the flue grate and the sintering machine trolley, a first ash cleaning hole is formed in the first ash hopper, and the first ash hopper is used for collecting particles intercepted by the flue grate;
preferably, the transition section comprises a transition left section and a transition right section; the transition left section is positioned on the left branch flue, and the transition right section is positioned on the right branch flue; the first ash buckets are multiple and are respectively arranged on the transition left section and the transition right section.
5. The sintering flue gas circulation system of claim 4, wherein:
and an access manhole door for providing an access window is arranged on the air box flue, and the access manhole door is positioned below the transition section.
6. The sintering flue gas circulation system of claim 4, wherein:
the circulating flue is provided with an expansion section, the joint of the air box outlet flue and the circulating flue is positioned at the expansion section, and the expansion section comprises a machine head expansion section and a machine tail expansion section;
a second ash hopper is arranged at the lower side of the expansion section, and a second ash cleaning hole is formed in the second ash hopper;
preferably, a circulating main exhaust fan is further installed on the circulating flue, and the circulating main exhaust fan is located between the bag-type dust collector and the smoke sealing cover;
the circulating flue and the flue gas sealing cover are connected through a plurality of circulating branch pipes, and each circulating branch pipe is provided with an adjusting valve;
the main flue of the sintering machine is connected with a chimney, and a machine head electric dust remover, a main sintering exhaust fan, a desulfurization device, a denitration device and an induced draft fan are sequentially installed on the main flue of the sintering machine.
7. The sintering flue gas circulation system of claim 6, wherein:
a third ash hopper is arranged at the lower side of the horizontal communication flue, and a third ash cleaning hole is formed in the third ash hopper; and a fourth ash hopper is arranged on the lower side of the inclined outlet flue, and a fourth ash cleaning hole is formed in the fourth ash hopper.
8. The sintering flue gas circulation system of claim 7, wherein:
the first ash bucket, the second ash bucket, the third ash bucket and the fourth ash bucket are all connected with an ash conveying pipe, and a manual gate valve and an electric double-layer ash discharge valve are arranged on the ash conveying pipe;
the ash conveying pipe is connected with the belt conveyor, and the belt conveyor is externally connected with a sintering machine batching system.
9. The sintering flue gas circulation system of claim 4, wherein:
the flue grate comprises transverse ribs and longitudinal ribs, and strip-shaped sieve holes are formed between the transverse ribs and the longitudinal ribs;
preferably, the transverse ribs and the longitudinal ribs are spliced or integrally arranged, and the transverse ribs and the longitudinal ribs are made of any one of wear-resistant chromium cast iron, high manganese steel, wear-resistant alloy steel and austempered ductile iron.
10. A sintering flue gas circulation system ash removal method is realized based on the sintering flue gas circulation system of any one of claims 1 to 9, and is characterized by comprising the following steps:
firstly, after flue gas enters an air box flue from the sintering pallet, flue grid bars are arranged in the air box flue to intercept particulate matters in the flue gas;
then, installing the bag-type dust collector on the circulating flue to remove fine particles in the flue gas;
and finally, arranging a first ash bucket on the air box flue, a second ash bucket on the circulating flue, and a third ash bucket and a fourth ash bucket on the air box outlet flue to collect the particles.
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Cited By (1)
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