CN111068446B - Sintering flue gas circulation system and ash removal method of sintering flue gas circulation system - Google Patents
Sintering flue gas circulation system and ash removal method of sintering flue gas circulation system Download PDFInfo
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- CN111068446B CN111068446B CN201911380965.7A CN201911380965A CN111068446B CN 111068446 B CN111068446 B CN 111068446B CN 201911380965 A CN201911380965 A CN 201911380965A CN 111068446 B CN111068446 B CN 111068446B
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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 circulation system and a dust removal method of the sintering flue gas circulation system. The sintering flue gas circulation system mainly comprises a sintering machine trolley, a flue gas sealing cover, a bellows flue, a bellows outlet flue, a bellows 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 grate bars in a flue of a bellows to intercept particles in the flue gas; the cloth bag dust remover is arranged on the circulating flue to remove fine particles in the flue gas; the first ash bucket is arranged on the air box flue, the second ash bucket is arranged on the circulating flue, and the third ash bucket and the fourth ash bucket are arranged on the air box outlet flue, so that particulate matters are collected. The invention can prolong the service time of the sintering flue gas circulation system, reduce the overhaul workload and the difficulty and prevent the sintering production from being influenced by the blockage of the grate bars of the sintering machine trolley.
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 circulation system and a dust removal method of the sintering flue gas circulation system.
Background
The pollutant discharge amount of the sintering process in the steel industry is large, and a sintering flue gas circulation technology is an important mode for reducing the pollutant discharge, so various circulation technologies have been proposed at home and abroad. There are foreign LEEP (low emission energy optimized sintering process), epoint (abbreviation for Environmentally Optimized Sintering, meaning: environmental optimized sintering), EOS (abbreviation for Emission Optimized Sintering, meaning: energy optimized sintering technology), and new japanese iron (regional exhaust gas recirculation process) processes; enterprises such as Ning steel, sand steel, head steel stock, bao steel, yong steel, moving steel and long steel are implemented respectively.
Due to the characteristics of sintering flue gas, the following problems generally exist in the application process of the sintering flue gas circulation technology:
1. the concentration of the particles in the sintering flue gas is high (can reach 5g/Nm 3 Left and right), the currently commonly adopted multi-pipe cyclone dust collector can only remove large particles, has low dust removal efficiency on fine particles, causes more residual particles in sintering flue gas, and causes serious abrasion of a flue and a fan.
2. The particle size distribution range of the particles in the sintering flue gas is wide, the particles are distributed from micron level and millimeter level to centimeter level, even the whole sintered ore falls into a flue or equipment of the sintering flue gas circulation system, and the particles are easy to block at flue elbows, valves, expansion joints and the like, so that the normal operation of the system is influenced, and the overhaul workload and difficulty are increased.
3. The content of alkali metals such as potassium, sodium, zinc and the like and alkaline earth metals in fine particles of sintering flue gas is higher, 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, the phenomenon that small particles adhere to grid bars of a trolley of a sintering machine along with the circulating flue gas is particularly easy to occur, and at a high sintering temperature, the particles with low melting point are melted and solidified on the grid bars, so that the color of the grid bars becomes white, the hardness becomes fragile, gaps among the grid bars become small until the grid bars are blocked, and the particles are difficult to clean. The more the grid section is blocked, the more serious the grid section is, the air permeability of the sintering material layer is reduced, the load of the sintering main exhaust fan is increased, the power consumption of the motor is increased, and finally the sintering production is seriously influenced.
Disclosure of Invention
The invention provides a sintering flue gas circulation system and a dust removal method of the sintering flue gas circulation 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 dust removal method of the sintering flue gas circulation system, which have the following technical scheme:
a sintering flue gas recirculation system comprising: the device comprises a sintering machine trolley, a flue gas sealing cover, a bellows flue, a bellows outlet flue, a bellows bypass flue, a sintering machine main flue, a circulating flue and a bag-type dust remover; 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 bellows, and the other end of the main flue of the sintering machine is used for exhausting flue gas; the bag-type dust collector is arranged on the circulating flue.
The above-mentioned sintering flue gas circulation system further preferably comprises: 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 sintering machine main flue 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 bellows bypass flue and the horizontal communication flue respectively, and the other end of the inclined outlet flue is connected with the circulating flue.
The above-mentioned sintering flue gas circulation system further preferably comprises: the valve further 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 bellows bypass flue; the third valve is arranged on the horizontal communication flue; the fourth valve is arranged at the junction of the right main flue and the bellows bypass flue.
The above-mentioned sintering flue gas circulation system further preferably comprises: the air box flue is characterized in that 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 grate bar is arranged in the transition section, the flue grate bar is obliquely arranged, and the included angle between the surface and the horizontal plane is not less than 45 degrees; and a first ash bucket is arranged on the transition section and between the flue grate and the sintering machine trolley, and is provided with a first ash cleaning hole for collecting particles trapped by the flue grate.
The above-mentioned sintering flue gas circulation system further preferably comprises: 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 hoppers are arranged in a plurality, and are respectively arranged on the transition left section and the transition right section.
The above-mentioned sintering flue gas circulation system further preferably comprises: and an inspection manhole door used for providing an inspection window is arranged on the bellows flue and is positioned below the transition section.
The above-mentioned sintering flue gas circulation system further preferably comprises: the circulating flue is provided with an expansion section, the connection part of the bellows outlet flue and the circulating flue is positioned at the expansion section, and the expansion section comprises a head expansion section and a tail expansion section; the second ash bucket is arranged on the lower side of the expansion section, and a second ash cleaning hole is formed in the second ash bucket.
The above-mentioned sintering flue gas circulation system further preferably comprises: and the circulating flue is also provided with a circulating main exhaust fan, and the circulating main exhaust fan is positioned between the bag-type dust collector and the smoke sealing cover.
The above-mentioned sintering flue gas circulation system further preferably comprises: the circulating flue is connected with the flue gas sealing cover through a plurality of circulating branch pipes, and each circulating branch pipe is provided with an adjusting valve.
The above-mentioned sintering flue gas circulation system further preferably comprises: a third ash bucket is arranged on the lower side of the horizontal communication flue, and a third ash cleaning hole is formed in the third ash bucket; a fourth ash bucket is arranged on the lower side of the inclined outlet flue, and a fourth ash cleaning hole is formed in the fourth ash bucket.
The above-mentioned sintering flue gas circulation system further preferably comprises: 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 discharging 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 proportioning system of the sintering machine.
The above-mentioned sintering flue gas circulation system further preferably comprises: the flue grate bar comprises transverse ribs and longitudinal ribs, and strip-shaped sieve holes are arranged between the transverse ribs and the longitudinal ribs.
The above-mentioned sintering flue gas circulation system further preferably comprises: the transverse ribs and the longitudinal ribs are spliced or integrally arranged, and the material is any one of wear-resistant chromium cast iron, high manganese steel, wear-resistant alloy steel and austempered ductile iron.
The above-mentioned sintering flue gas circulation system further preferably comprises: the main flue of the sintering machine is connected with a chimney, and a machine head electric dust collector, a sintering main exhaust fan, a desulfurizing device, a denitration device and an induced draft fan are sequentially arranged on the main flue of the sintering machine.
The ash removal method of the sintering flue gas circulation system is realized based on the sintering flue gas circulation system and comprises the following steps: firstly, after flue gas enters a wind box flue from the sintering machine trolley, a flue grate is arranged in the wind box flue to intercept particles in the flue gas; then, installing the cloth bag dust remover on the circulating flue to remove fine particles in the flue gas; finally, a first ash bucket is arranged on the bellows 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 bellows outlet flue, so that the particulate matters are collected.
Analysis shows that compared with the prior art, the invention has the following advantages:
according to the invention, fine particles are removed by arranging the cloth bag dust remover; intercepting small sintered ores by arranging a flue grate; the transition section, the inclined outlet flue and the expansion section are arranged to deposit particles in the flue gas, so that the particles in the flue gas can be removed in a grading manner, and the removal efficiency of the particles 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 place that easy cigarette ash was piled up in the pipeline, adopt this kind of multiple dust removal, dust fall means come the particulate matter in 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 degree of difficulty, prevents sintering machine platform truck grate bar jam and influences sintering production.
Drawings
Fig. 1 is a schematic view of the longitudinal connection of a sintering flue gas circulation system.
Fig. 2 is a schematic view of the lateral connection of the sintering flue gas circulation system.
Fig. 3 is an enlarged view at a in fig. 2.
Fig. 4 is a schematic view of the structure of the flue grate.
FIG. 5 is a schematic diagram of the connection of the second hopper to the nose expansion section and the tail expansion section.
In the figure: 1-a sintering machine trolley; 2-a smoke sealing cover; 3-regulating valve; 4-a circulation branch pipe; 5-circulating flue; 6-circulating a main exhaust fan; 7-a bag-type dust remover; 8-a tail expanding section; 9-a head expanding section; 10-a bellows outlet flue; 11-a main flue of the sintering machine; 12-a nose electric dust remover; 13-sintering a main exhaust fan; 14-a desulfurization device; 15-a denitration device; 16-induced draft fan; 17-chimney; 18-a bellows flue; 19-a bellows bypass flue; 20-transition right segment; 21-a first ash bucket; 22-right branch flue; 23-horizontally communicating with the flue; 24-inspection manhole door; 25-fourth valve; 26-right main flue; 27-a third ash bucket; 28-a third valve; 29-a second valve; 30-a left main flue; 31-a fourth ash bucket; 32-a second ash bucket; 33-expanding section; 34-inclined outlet flue; 35-a first valve; 36-left branch flue; 37-flue grate bars; 38-transition left segment; 39-a second ash removal hole; 40-ash conveying pipe; 41-manual gate valve; 42-an electric double-layer ash valve; 43-longitudinal ribs; 44-transverse ribs.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. refer to the orientation or positional relationship based on that shown in the drawings, merely for convenience of description of the present invention 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 "coupled" and "connected" as used herein are to be construed broadly and may be, for example, fixedly coupled or detachably coupled; either directly or indirectly through intermediate components, the specific meaning of the terms being understood by those of ordinary skill in the art as the case may be.
Referring to fig. 1 to 5, fig. 1 is a schematic view of a longitudinal connection of a sintering flue gas circulation system; FIG. 2 is a schematic view of the lateral connection of a sintering flue gas recirculation system; FIG. 3 is an enlarged view of FIG. 2 at A; FIG. 4 is a schematic view of the structure of the flue grate; FIG. 5 is a schematic diagram of the connection of the second hopper to the nose expansion section and the tail expansion 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, a bellows flue 18, a bellows outlet flue 10, a bellows bypass flue 19, a sintering main flue 11, a circulation flue 5 and a bag-type dust remover 7; the flue gas sealing cover 2 is arranged on the sintering pallet 1; one end of the bellows flue 18 is connected with the sintering pallet 1, and the other end is respectively connected with one end of the bellows outlet flue 10 and one end of the bellows bypass flue 19; one end of the circulating flue 5 is connected with the other end of the bellows 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 bellows, and the other end of the main flue 11 of the sintering machine is used for exhausting flue gas; 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 bellows flue 18 from the sintering machine trolley 1, and the circulation direction in the bellows flue 18 is divided into two types: a flue gas enters the bellows outlet flue 10, the bellows outlet flue 10 enters the circulating flue 5, and the circulating flue 5 enters the flue gas sealing cover 2 to realize flue gas circulation; the other kind of the air enters the air box bypass flue 19, enters the main flue 11 of the sintering machine from the air box bypass flue 19, and is discharged from the main flue 11 of the sintering machine. When the flue gas is circulated, the bag-type dust collector 7 is arranged on the circulating flue 5, so that the phenomenon that fine particles with higher alkali metal and alkaline earth metal contents such as potassium, sodium, zinc and the like adhere to the trolley grate bars of the sintering trolley 1 along with the flue gas to influence sintering production or cause accidents can be avoided. The cloth bag dust remover 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 the sintering material layer, 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 also provides the following improvement scheme:
as shown in fig. 1 and 2, in the present invention, the bellows 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 that the air pressures on the left and right sides in the sintering pallet 1 can be balanced, and the suction forces on the left and right sides of the sintering pallet 1 by the sintering main suction fan 13 are 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 a wind box bypass flue 19, a right branch flue 22 is connected with the right main flue 26 through a wind box bypass flue 19, flue gas which is required to be discharged from the outside of the sintering machine main flue 11 on the left side in the sintering machine trolley 1 is discharged from the left main flue 30, and flue gas which is required to be discharged from the outside of the sintering machine main flue 11 on the right side in the sintering machine trolley 1 is discharged from the right main flue 26; the air box outlet flue 10 comprises a horizontal communication flue 23 and an inclined outlet flue 34, one end of the horizontal communication flue 23 is connected with a left branch flue 36 and an air box bypass flue 19, and the other end of the horizontal communication flue 23 is respectively connected with a right branch flue 22 and an air box bypass flue 19, so that a three-way pipeline structure is formed at the right side of the sintering pallet 1; one end of the inclined outlet flue 34 is respectively connected with the left branch flue 36, the wind box bypass flue 19 and the horizontal communication 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 pallet 1; the flue gas which participates in the flue gas circulation on the right side in the sintering pallet 1 enters the horizontal communication flue 23 from the right branch flue 22, then enters the inclined outlet flue 34 from the horizontal communication flue 23, is discharged into the circulation flue 5 from the inclined outlet flue 34 and enters the flue gas sealing cover 2 for internal reference and 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 for internal reference and circulation. According to the invention, through arranging the three-way pipeline structure and the four-way pipeline structure, all pipelines can be combined, so that the smoke flow path is optimized, the pipeline air pressure is balanced, and the pipeline consumable is saved.
Further, as shown in fig. 1 and 2, in the present invention, the first valve 35, the second valve 29, the third valve 28 and the 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; the second valve 29 is arranged at the junction of the left main flue 30 and the fan box bypass flue 19; the third valve 28 is arranged on the horizontal communication flue 23; the fourth valve 25 is installed at the junction of the right main flue 26 and the fan box bypass flue 19. When the smoke circulation is performed (when the smoke circulation system is in normal operation), 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 smoke circulation is not performed (when the smoke circulation system is closed), the first valve 35 and the third valve 28 are closed, and the second valve 29 and the fourth valve 25 are opened. The invention is provided with the first valve 35, the second valve 29, the third valve 28 and the 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 the flue gas circulation system can be controlled by matching with equipment such as the circulating main exhaust fan 6, the cloth bag dust collector 7 and the like, and the operation control is convenient (wherein, as long as the sintering machine operates normally and equipment in the flue gas circulation system is normal, the flue gas circulation system should be opened and kept to operate continuously.
As shown in fig. 1 and 2, in the invention, one end of the bellows flue 18 connected with the sintering pallet 1 is provided with a transition section which is obliquely arranged, the transition section is in a horn mouth shape, and when flue gas enters the transition section, a path suddenly narrows, so that the flue gas is convenient to collect, and the deposition of particles in the flue gas is facilitated. The flue grate bars 37 are installed in the transition section, the flue grate bars 37 are obliquely arranged, the included angle between the surface and the horizontal plane is not smaller than 45 degrees, and the minimum included angle range between the surface of the flue grate bars 37 and the axis of the transition section is 60-90 degrees, so that particles can impact the surface of the flue grate bars 37 and slide down along the surface of the flue grate bars 37, small sintered ores mixed in the flue gas are trapped, and the normal flow of the flue gas is not influenced. Meanwhile, a first ash bucket 21 is arranged on the transition section and between the flue grate 37 and the sintering machine trolley 1, small sintered ores (particles) trapped by the flue grate 37 can be contained and collected, and a first ash cleaning hole is formed in the first ash bucket 21, so that the first ash bucket 21 is convenient to clean and maintain.
Further, as shown in fig. 2 and 4, in the present invention, the flue grate 37 includes the transverse ribs 44 and the longitudinal ribs 43, and the strip-shaped sieve holes are provided between the transverse ribs 44 and the longitudinal ribs 43, so that the arrangement can cut off small sintered ore and the circulation of flue gas is not affected. As an alternative embodiment, the transverse ribs 44 and the longitudinal ribs 43 may be welded together or cast as a unitary structure. In the 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 sections include a transition left section 38 and a transition right section 20; the transition left section 38 is positioned on the left branch flue 36, the transition right section 20 is positioned on the right branch flue 22, and the horn mouth orientation and the inclination angle of the transition left section 38 are symmetrically arranged with the horn mouth orientation and the inclination angle of the transition right section 20; the first ash bucket 21 is a plurality of, and a first ash bucket 21 is installed on each transition left section 38 and each transition right section 20, so that small sintered ores trapped by the flue grate 37 can be conveniently collected, and the first ash bucket 21 positioned on the transition left section 38 and the first ash bucket 21 positioned on the transition right section 20 are symmetrically arranged.
As shown in fig. 1 and 2, in the present invention, the bellows stack 18 is provided with an access door 24 for providing an access window, the access door 24 being located below the transition section. On the bellows flue 18, the part below the transition section is a vertical pipe section, the lower part of the vertical pipe section is of a three-way pipeline structure, downward flowing and horizontal leftward flowing flue gas are staggered, so that air flow turbulence is easy to generate, particles are easy to adhere to the inner side of the pipe wall of the bellows flue and deposit, and the invention is provided with an inspection manhole door 24, so that the bellows flue is convenient to inspect regularly. In addition, the inspection manhole door 24 is positioned at the pipeline structure of the tee joint, and can also observe the particulate matter deposition conditions on the horizontal communication flue 23 and the bellows bypass flue 19.
As shown in fig. 1 to 3, in the present invention, an expansion section 33 is provided on a circulation flue 5, where a bellows outlet flue 10 is connected to the circulation 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 expands, the flow velocity of the flue gas decreases, and the sedimentation of particulate matters in the flue gas is facilitated. The second ash bucket 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 should be 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 head expanding section 9 is connected with a plurality of bellows outlet flues 10 positioned at the head part of the sintering pallet 1, and the tail expanding section 8 is connected with a plurality of bellows outlet flues 10 positioned at the tail part of the sintering pallet 1. In the invention, instead of selecting all 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 selected selectively to participate in the flue gas circulation. And the flue gas discharged from the part of the sintering machine trolley 1 which is not selected to participate in the flue gas circulation is directly connected with the main flue 11 of the sintering machine through the bellows flue 18.
As known to those skilled in the art, the sintering pallet 1 can be divided into four types from front end to end, and the exhaust smoke can be sequentially divided into: the first type is high oxygen, low temperature, low dust and low pollutant smoke; the second category is high concentration carbon monoxide and high concentration nitrogen oxide flue gas; the third category is high-concentration sulfur dioxide flue gas; the fourth category is high oxygen, high temperature, low dust and low pollutant fumes. The first type flue gas and the fourth type flue gas can be directly discharged after being treated, and the second type flue gas and the third type flue gas are selected for circulation, so that the flue gas treatment burden can be reduced. For example, taking a sintering pallet 1 with 23 flues as an example, the flue gas with reference to the flue gas circulation in the head expanding section 9 is high-concentration carbon monoxide and high-concentration nitrogen oxide flue gas, and the corresponding flue numbers are from No. 4 to No. 8; the smoke which is internally referred to the smoke circulation in the tail expanding section 8 is high-concentration sulfur dioxide smoke, and the corresponding smoke channel number is 20-23.
As shown in fig. 1, in the invention, the circulating flue 5 is also provided with the circulating main exhaust fan 6, and the circulating main exhaust fan 6 is positioned between the bag-type dust collector 7 and the flue gas sealing cover 2, so that the flue gas circulating efficiency can be improved. The circulating flue 5 is connected with the smoke sealing cover 2 through a plurality of circulating branch pipes 4, so that circulating smoke is uniformly distributed in the smoke sealing cover 2, and each circulating branch pipe 4 is provided with a regulating valve 3, so that the air inflow of the circulating smoke is conveniently regulated.
As shown in fig. 2, in the present invention, the horizontal communication flue 23 is horizontally arranged, the length is about 8 meters, the flow rate of flue gas is low, and the flue gas is easy to be blocked by the deposition of particulate matters, and the third ash bucket 27 is installed at the lower side of the horizontal communication flue 23, so that the deposited particulate matters of the horizontal communication flue 23 can be collected. Further, the length of the third ash bucket 27 is matched with that of the horizontal communication flue 23, and the third ash bucket is long and narrow (the length is about 8 meters), so that deposited particles in the whole flue section of the horizontal communication flue 23 can be conveniently collected; the third ash bucket 27 is provided with a third ash cleaning hole, so that the third ash bucket 27 is convenient to clean and maintain. The inclined outlet flue 34 is inclined upwards from right to left, particles in the flue gas can be blocked by utilizing the inside of the lower side in the flue gas circulation process, the particles are beneficial to settling on the inclined outlet flue 34, the lower side of the inclined outlet flue 34 is adapted to the fourth ash bucket 31, the particles can be collected, and the fourth ash bucket 31 is provided with a fourth ash cleaning hole, so that the fourth ash bucket 31 is convenient to clean and maintain.
Further, as shown in fig. 2 and 3, in the 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 with the ash conveying pipe 40, the ash conveying pipe 40 is connected with the belt conveyor, and the belt conveyor is externally connected with a proportioning system of the sintering machine, so that the collected small sintered ore and particulate matters can be redistributed to the sintering machine trolley 1 for combustion, thereby being beneficial to the maximum utilization of resources (because the particle size of ash collected by the bag-type dust collector 7 is smaller, the content of alkali metals, such as potassium, sodium, zinc and the like, and alkaline earth metals is higher, and the ash is not suitable for being sent into the proportioning system of the sintering machine, and therefore the bag-type dust is transported outwards); the manual gate valve 41 and the electric double-layer ash discharging valve 42 are arranged on the ash conveying pipe 40, and when the ash is discharged, the manual gate valve 41 and the electric double-layer ash discharging valve 42 are opened to discharge ash; after the ash is discharged, the manual gate valve 41 and the electric double-layer ash discharging valve 42 are closed, when the electric double-layer ash discharging valve 42 is overhauled, the manual gate valve 41 is closed first, and then the electric double-layer ash discharging valve 42 is detached for overhauling, so that the external cold air can be prevented from entering.
As shown in fig. 1, in the present invention, as a treatment means for the flue gas which does not participate in the flue gas circulation, a main sintering flue 11 is connected to a chimney 17, and a main sintering flue 11 is provided with a main head electric dust collector 12 for removing the flue gas, a main sintering exhaust fan 13, a desulfurization device 14 for desulfurizing the flue gas, a denitration device 15 for denitrating the flue gas, and an induced draft fan 16 in this order. The sintering main exhaust fan 13 can continuously suck air above the material surface of the sintering machine into the sintering machine material layer to participate in the sintering process, and can apply work to sintering flue gas generated after sintering, so that the flue gas sequentially enters the sintering machine main flue 11 through the air box flue 18 and the air box bypass flue 19; the induced draft fan 16 can do work on the sintering flue gas sucked by the sintering main exhaust fan 13, so that the sintering flue gas sequentially passes through the desulfurization device 14, the denitration device 15 and the induced draft fan 16 until reaching the chimney 17.
Meanwhile, as shown in fig. 1 to 5, the invention also provides a dust removing method of the sintering flue gas circulation system based on the sintering flue gas circulation system, which comprises the following steps: firstly, after flue gas enters a wind box flue 18 from a sintering pallet 1, a flue grate 37 is arranged in the wind box flue 18 to intercept particles (mainly small sintered ores) in the flue gas; then, a cloth bag dust remover 7 is arranged on the circulating flue 5 to remove fine particles in the flue gas; finally, the first hopper 21 is arranged on the bellows flue 18, the second hopper 32 is arranged on the circulation flue 5, and the third hopper 27 and the fourth hopper 31 are arranged on the bellows outlet flue 10, so as to collect the particulate matters.
According to the ash removal method for the sintering flue gas circulation system, large particles (mainly small sintered ores), fine particles and pipeline sediments in the sintering flue gas are subjected to grading treatment (wherein the particle size of the large particles is 1cm to 5cm, the particle size of the fine particles is in the micron level, the particle size of the pipeline sediments is smaller than the particle size of the fine particles), so that the operation condition of the sintering flue gas circulation system can be improved, and the effective service time of the sintering flue gas circulation system can be prolonged.
In conclusion, the fine particles are removed by arranging the cloth bag dust remover; intercepting small sintered ores by arranging a flue grate; the transition section, the inclined outlet flue and the expansion section are arranged to deposit particles in the flue gas, so that the particles in the flue gas can be removed in a grading manner, and the removal efficiency of the particles 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 place that easy cigarette ash was piled up in the pipeline, adopt this kind of multiple dust removal, dust fall means come the particulate matter in 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 degree of difficulty, prevents sintering machine platform truck grate bar jam and influences sintering production.
It will be appreciated by those skilled in the art that the present invention can be carried out in other embodiments without departing from the spirit or essential characteristics thereof. Accordingly, the above disclosed embodiments are illustrative in all respects, and not exclusive. All changes that come within the scope of the invention or equivalents thereto are intended to be embraced therein.
Claims (8)
1. A sintering flue gas recirculation system, comprising:
the sintering machine trolley, the flue gas sealing cover, the air box flue, the air box outlet flue, the air box bypass flue, the sintering machine main flue, the circulating flue, the bag-type dust remover, the first valve, the second valve, the third valve and the fourth valve;
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, the other end of the circulating flue is connected with the flue gas sealing cover, an expansion section is arranged on the circulating flue, the connection part of the air box outlet flue and the circulating flue is positioned at the expansion section, the expansion section comprises a machine head expansion section and a machine tail expansion section, and a second ash bucket is arranged on the lower side of the expansion section;
one end of the main flue of the sintering machine is connected with the other end of the bypass flue of the bellows, and the other end of the main flue of the sintering machine is used for exhausting flue gas;
the bag-type dust collector is arranged on the circulating flue;
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 sintering machine main flue 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 respectively connected with the left branch flue, the bellows bypass flue and the horizontal communication flue, the other end of the inclined outlet flue is connected with the circulating flue, and the inclined outlet flue is inclined from right to left and is used for blocking particulate matters in the flue gas by utilizing the inner part of the lower side in the flue gas circulation process;
a third ash bucket is arranged at the lower side of the horizontal communication flue; a fourth ash bucket is arranged on the lower side of the inclined outlet flue;
the air box flue is characterized in that 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 grate bar is arranged in the transition section, the flue grate bar is obliquely arranged, and the included angle between the surface and the horizontal plane is not less than 45 degrees;
a first ash bucket is arranged on the transition section and between the flue grate and the sintering machine trolley, and is provided with a first ash cleaning hole for collecting particles trapped by the flue grate;
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 hoppers are arranged on the transition left section and the transition right section respectively;
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 bellows bypass flue;
the third valve is arranged on the horizontal communication flue;
the fourth valve is arranged at the junction of the right main flue and the bellows bypass flue.
2. The sintering flue gas recirculation system of claim 1, wherein:
and an inspection manhole door used for providing an inspection window is arranged on the bellows flue and is positioned below the transition section.
3. The sintering flue gas recirculation system of claim 1, wherein:
and a second ash removing hole is formed in the second ash bucket.
4. The sintering flue gas recirculation system of claim 1, wherein:
the circulating flue is also provided with a circulating main exhaust fan, and the circulating main exhaust fan is positioned between the bag-type dust collector and the smoke sealing cover;
the circulating flue is connected with the flue gas sealing cover 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 collector, a sintering main exhaust fan, a desulfurizing device, a denitration device and an induced draft fan are sequentially arranged on the main flue of the sintering machine.
5. The sintering flue gas recirculation system of claim 1, wherein:
a third ash removing hole is formed in the third ash bucket; and a fourth ash cleaning hole is formed in the fourth ash bucket.
6. The sintering flue gas recirculation system of claim 1, 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 discharging 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 proportioning system of the sintering machine.
7. The sintering flue gas recirculation system of claim 1, wherein:
the flue grate bar comprises transverse ribs and longitudinal ribs, and strip-shaped sieve holes are arranged between the transverse ribs and the longitudinal ribs.
8. The sintering flue gas recirculation system of claim 7, wherein:
the transverse ribs and the longitudinal ribs are spliced or integrally arranged, and the material is any one of wear-resistant chromium cast iron, high manganese steel, wear-resistant alloy steel and austempered ductile iron.
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