CN113551525A - Integrated sintering flue gas external circulation system - Google Patents
Integrated sintering flue gas external circulation system Download PDFInfo
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- CN113551525A CN113551525A CN202110742479.6A CN202110742479A CN113551525A CN 113551525 A CN113551525 A CN 113551525A CN 202110742479 A CN202110742479 A CN 202110742479A CN 113551525 A CN113551525 A CN 113551525A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
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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
- F27D17/004—Systems for reclaiming waste heat
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses an integrated sintering flue gas external circulation system. A plurality of flue gas shunting mixers are arranged on the sintering machine along the traveling direction, a branch pipe of a ring cold flue gas pipeline is connected to a first inlet of each flue gas shunting device, a branch pipe of a sintering flue gas pipeline is connected to a second inlet of each flue gas shunting device, an electric control valve and a flowmeter are arranged on the branch pipe, a pressure gauge, a thermometer, an oxygen content monitoring meter and a gas flowmeter are arranged on the sintering flue gas pipeline and the ring cold flue gas pipeline, the electric control valves on the branch pipes accurately control the gas flow in each branch pipe so as to meet the requirement of the circulating air volume of each sintering zone, and the oxygen content of the flue gas after mixing is controlled on the basis of controlling the sintering flue gas volume and the ring cold flue gas volume entering the flue gas shunting mixers. The circular cooling flue gas is supplemented with a small amount of oxygen and then is mixed with the sintering flue gas with slightly lower oxygen content, so that the most uniform mixing effect can be achieved by using the least oxygen supplementing amount, the requirement of the mixed flue gas on the lowest oxygen content during sintering is met, and the waste heat of the sintering flue gas with slightly lower oxygen content is fully utilized.
Description
Technical Field
The invention belongs to the technical field of sintering flue gas treatment, and particularly provides an integrated sintering flue gas external circulation system.
Background
The sintering flue gas circulation process is a sintering method for selectively returning part of high-temperature low-sulfur sintering waste gas and low-temperature high-oxygen waste gas at the circular cooler to a sealed flue gas cover at the upper part of the surface of a sintering machine trolley for recycling, and aims to recover sensible heat and latent heat in the sintering waste gas, improve the utilization rate of waste heat generated by sintering, reduce the fuel ratio, improve the treatment concentration of sulfur dioxide, nitrogen oxide and dust, reduce the waste gas treatment capacity of a desulfurization and denitrification system, reduce the fixed investment and the operation cost of a purification system, and finally realize energy conservation and emission reduction. The current sintering flue gas circulation process is divided into two types, namely internal circulation and external circulation.
As shown in fig. 10, in the internal circulation process, the newly added exhaust fan directly pumps the air box waste gas with high temperature, high oxygen content and low sulfide, especially sulfur dioxide content into the newly arranged pipeline without entering the original flue, and the air box waste gas is dedusted by the deduster and then uniformly mixed with the circulating hot air from the circular cooler in the mixer, enters the flue gas hood of the sintering machine trolley, and then participates in the sintering process through the material layer again.
As shown in fig. 11, the external circulation process is based on the conventional sintering process, and is characterized in that the waste gas of a flue with high oxygen content and low sulfide content, especially sulfur dioxide content, is led out by a circulating fan after a main exhaust fan, and is uniformly mixed with the circulating hot air of the circular cooler dedusted by a deduster in a smoke box mixer, and enters the front cover of the sintering machine trolley, and then participates in the sintering process through a material bed again.
The internal circulation process needs to additionally arrange a new pipeline at the branch pipe of the air box for taking air, although the short circuit of the circulating air flow can be avoided to ensure the stability of the air flow, the internal circulation process has more engineering improvement amount and high fixed investment, and is more suitable for newly-built projects, and is not suitable for the existing projects which are built and put into operation, while the external circulation process takes air from the flue behind the low-sulfur section exhaust fan, and can reduce the stability of the air flow, but only needs to additionally arrange a low-power induced draft fan and a flue gas inlet pipeline on the basis of the original process, and compared with the conventional sintering, the internal circulation process does not need more modification, has low fixed investment and is more suitable for the improvement of the existing projects and projects.
The technical research in the field finds that the sintering machine is divided into an ignition area, a circular cooling flue gas area and SO along the traveling direction of a trolley2Region of rapid rise in concentration, SO2The concentration of the sintering flue gas SO generated in 5 areas such as a rapid reduction area, a sintering flue gas area and the like, an ignition area and a ring cooling flue gas area2The concentration is low and is less than 100mg/m3，NOxThe concentration is higher, generally 400mg/m3The above; SO (SO)2Flue gas SO generated in area with rapidly increased concentration2The concentration is from 100mg/m3The following rapid increase to 2000mg/m3Above (the highest value is related to the sulfur content of the sintering mixture and the sintering process parameters), the NO contentxThe concentration begins to decrease, but the decrease trend is not large; SO (SO)2Flue gas SO generated in area with rapidly reduced concentration2The concentration is from 2000mg/m3The above quickly decreases to 50mg/m3Left and right, containing NOxThe concentration is rapidly reduced from 300mg/m3Quickly decreases to 50mg/m3The following; flue gas generated in the sintering flue gas area and containing SO2And NOxThe concentration is lower than 50mg/m3。
The study by a.s.mehta et al suggests that the reduction of O into the sinter bed2The content, sintering speed and the maximum temperature of the sinter bed all have a tendency to decrease. Yushiyuan et al reached a similar conclusion as A.S. Mehta and further indicated that O when entering the sinter bed2The content is reduced, the incomplete combustion degree of the fuel is increased, and the generation amount of a liquid phase is reduced. The research on the influence of oxygen partial pressure on iron ore sintering and forming shows that the minerals generated under oxidizing atmosphere are mainly hematite and calcium ferrite, while the oxygen partial pressure is reduced during sintering, the reducing atmosphere is strengthened, and the content of magnetite is changed along with the content of magnetiteIt increases, hematite and calcium ferrite decrease. The li shin professor indicates that in the flue gas circulation sintering process, the content of CO in the circulation gas is beneficial to the whole sintering process, the CO generates a large amount of heat after being combusted again in the sintering ore zone, the crystallization speed of the sintering ore can be reduced, the heat can also enter the combustion zone along with the flue gas to form hot air sintering, the improvement of the sintering ore production process is beneficial, the CO generates a large amount of heat after being combusted again in the sintering ore zone, the crystallization speed of the sintering ore can be reduced, the heat can also enter the combustion zone along with the flue gas to form hot air sintering, and the improvement of the quality of the sintering ore is beneficial.
The results of the study by Xiong Lin et al show that: as the oxygen content of the circulating flue gas increases, the vertical sintering speed, yield, productivity and drum strength all gradually increase. When the oxygen content of the circulating flue gas is not lower than 18%, the influence of the change of the oxygen content on the combustion rate in the sintering process is limited, but the reduction of the oxygen content of the circulating flue gas can reduce the oxygen content in the sintering flue gas, inhibit the generation of sintered ore calcium ferrite, slightly reduce the reduction degree and improve the performance of low-temperature reduction degradation. Compared with the benchmark, the adoption of the circulating sintering can prolong the high-temperature maintaining time of the material layer and lead SO in the circulating flue gas to be2Resulting in enrichment. The oxygen content of the circulating flue gas is controlled to be more than 18 percent, and the sintered ore with good quality index and reasonable ore phase composition can be obtained.
But the current sintering flue gas treatment system has the following problems:
1. the transformation difficulty is high, and the applicability to the existing engineering or newly-built engineering project is low;
2. the flue gas mixing effect is poor, the oxygen content (volume fraction) of the circulating flue gas is 18%, the gain on the sintered mineral quality is the largest, and the influence is the smallest, while the flue gas mixing uniformity effect of the existing sintering flue gas treatment system is poor, and the quality of the sintered ore is influenced by the too low local oxygen content when the circulating flue gas is led to the sintered material on the surface of a sintering machine;
3. the integration degree of the process flow of the existing sintering flue gas treatment system for gas inlet, mixing and mixed flue gas discharge is poor, and the utilization efficiency of the circulating flue gas is reduced.
The integrated external circulation utilization system for the waste heat of the sintering flue gas integrates the processes of feeding, mixing and discharging the sintering flue gas into one device, simplifies the processes, improves the use efficiency of the circulating flue gas, performs flue gas mixing simulation calculation on the flue gas mixer in the system, and has the advantages of uniform distribution of the oxygen concentration of the mixed flue gas, more than 18 percent of the average value of the oxygen content, simplified process, improved efficiency, easy modification, easy maintenance and the like.
Disclosure of Invention
The invention aims to solve the problems of complicated reconstruction, redundant process, poor uniformity of oxygen content of mixed flue gas and the like of the conventional sintering flue gas treatment system. The invention provides an integrated sintering flue gas external circulation system, which has the advantages of uniform distribution of oxygen concentration of mixed flue gas, average oxygen content of more than 18%, simple process, high efficiency, low modification cost and the like when the problem of recycling of sintering waste gas is solved.
In order to achieve the purpose, the invention adopts the technical scheme that:
an integrated sintering flue gas external circulation system is used for providing oxygen-containing circulating gas for a sintering machine trolley and desulfurizing and purifying high-sulfur flue gas discharged by the sintering machine trolley, and comprises:
air inlet pipeline, including sintering flue gas pipeline, ring cold flue gas pipeline, flue gas reposition of redundant personnel blender, the flue gas reposition of redundant personnel blender is installed on the sintering machine platform truck, flue gas reposition of redundant personnel blender is equipped with first entry, second entry and mixes the wind export, the flue gas export of ring cold flue gas pipeline's entry go-between cold machine, exit linkage first entry, low sulfur flue gas flue, exit linkage are connected to the entry of sintering flue gas pipeline the second entry divide into the sintering machine in proper order along sintering machine platform truck advancing direction and ignite regional, ring cold flue gas region, SO with the sintering machine2Region of rapid rise in concentration, SO25 areas such as a concentration rapid reduction area, a sintering flue gas area and the like, an inlet and ignition area of the low-sulfur flue gas flue, an annular cooling flue gas area and an SO area2The outlet of the lower air box of the concentration rapid reduction area and the sintering flue gas area is connected, and the outlet is connected to a chimney through a desulfurization system; ring cold flue gas zone, SO2Region of rapid rise in concentration, SO2The lower air box of the region with the quickly increased concentration is connected to a chimney through a high-sulfur flue gas flue and a desulfurization system;
a plurality of flue gas shunting mixers are arranged along the travelling direction of a sintering machine trolley, an upper flue gas chamber, a middle flue gas chamber and a lower flue gas chamber are arranged in each flue gas shunting mixer, a square trumpet-shaped flue gas cover is arranged at a gas outlet of the lower flue gas chamber and is tightly attached to the trolley surface of the sintering machine trolley, the upper flue gas chamber is separated from the middle flue gas chamber through a first partition plate, the middle flue gas chamber is separated from the lower flue gas chamber through a second partition plate, the upper flue gas chamber is connected with a first inlet, and the middle flue gas chamber is connected with a second inlet; the bottom surface of the second flue gas partition plate is connected with n columns of longitudinal partition plates and m rows of transverse partition plates which are arranged along the vertical direction of the side of the box body, the longitudinal partition plates and the transverse partition plates are mutually staggered and divide into x multiplied by y rectangular grids in the lower flue gas chamber, and the x multiplied by y rectangular grids jointly form a honeycomb flue gas flow distribution pipe group; half of the x y rectangular grids are female grids, the other half of the x y rectangular grids are male grids, the female grids and the male grids are alternately arranged in the longitudinal direction and the transverse direction of the x y rectangular grids, the female grids are communicated with the middle flue gas chamber through holes formed in the second flue gas partition plate, and the male grids are communicated with the upper flue gas chamber through a flue gas shunt pipe;
the controller, be equipped with manometer, thermometer, oxygen content monitor, gas flowmeter and circulating fan on sintering flue gas pipeline, the ring cold flue gas pipeline, all be equipped with automatically controlled valve on the branch pipe of sintering flue gas pipe connection second entry and the branch pipe of ring cold flue gas pipe connection first entry, automatically controlled valve, gas flowmeter and oxygen content monitor respectively with the controller signal connection.
Furthermore, a dust remover and a fan are arranged on the low-sulfur flue gas flue and the high-sulfur flue gas flue.
Preferably, the ring-cooled flue gas region, SO2A switching valve is arranged on a branch pipeline connected with the lower air box, the low-sulfur flue gas flue and the high-sulfur flue gas flue in the region with the quickly reduced concentration, and the switching valve is used for selectively sending the flue gas to the lower air box according to the sulfide content of the flue gas pumped into the lower air box by the sintering mixture under different working conditionsAnd then enters a low-sulfur flue gas flue or a high-sulfur flue gas flue.
Preferably, a gas flowmeter and a thermometer are arranged on the branch pipe of the sintering flue gas pipeline connected with the second inlet and the branch pipe of the annular cooling flue gas pipeline connected with the first inlet; the electric control valves on the branch pipes are used for accurately controlling the gas flow in each branch pipe so as to meet the circulating air flow required by sintering, and controlling the oxygen content of the mixed flue gas on the basis of controlling the sintering flue gas amount and the annular cooling flue gas amount entering the flue gas shunting mixer.
Preferably, the cross section of the trumpet-shaped flue gas cover is as wide as the surface of the sintering machine trolley, and a sealing plate is arranged at the joint of the flue gas cover and the surface of the sintering machine trolley.
Preferably, the first inlet and the second inlet of the flue gas diversion mixer are respectively arranged on two opposite side surfaces of the box body, the distance between the first flue gas partition plate and the top surface of the upper flue gas chamber is gradually decreased in the direction from the first inlet side of the upper flue gas chamber to the second inlet side of the middle flue gas chamber, and the distance between the first flue gas partition plate and the second flue gas partition plate is gradually increased in the direction from the first inlet side of the upper flue gas chamber to the second inlet side of the middle flue gas chamber.
Furthermore, the cross section area of the flue gas shunt pipe in the flue gas shunt mixer is smaller than that of the positive square grids, the cross sections of the negative square grids and the positive square grids are the same, and the height of the rectangular square grids in the vertical direction of the box body is smaller than that of the flue gas chamber at the lower part.
Furthermore, an included angle between the first flue gas partition plate in the flue gas shunting mixer and the upper flue gas chamber is an acute angle smaller than 20 degrees.
The invention has the beneficial effects that: 1. when the ring-cooled flue gas and the sintered flue gas respectively enter the upper flue gas chamber and the middle flue gas chamber from the first inlet and the second inlet and are mixed in the lower flue gas mixing chamber, according to the principle of gas splitting in a collecting flue in hydrodynamics, when a plurality of branch pipes are arranged on the main pipe along the length direction of the main pipe, the branch pipes closer to the terminal end of the main pipe have higher partial pressure, so that the flow cross-sectional areas of the branch pipes closer to the terminal end of the main pipe are equal, the flow of the branch pipes closer to the terminal end of the main pipe is higher, therefore, the ring-cooled flue gas entering the flue gas splitting pipe is more and more, and due to the resistance action of the flue gas splitting pipe in the middle flue gas chamber, the resistance at the position closer to the second inlet is lower, the sintered flue gas is more likely to enter the female grid at the position closer to the second inlet, so the area of the ring-cooled flue gas at the flue gas splitting pipe closer to the position of the second inlet is larger, and the flue gas is mixed with more sintering flue gas at the corresponding position, the area of the ring-cooling flue gas at the position closer to the first inlet for heat exchange in the flue gas shunt pipe is smaller, the ring-cooling flue gas entering the flue gas shunt pipe is less at the time, less sintering flue gas at the corresponding position enters the female grids, and finally the flue gas below each female grid and the male grid after entering the lower flue gas mixing chamber is uniformly mixed and has uniform temperature.
The flue gas shunting mixer has an included angle between the top of the upper flue gas chamber and the first flue gas baffle plate, the included angle is 5-10 degrees, a trapezoidal space is formed between the top of the box body and the first flue gas baffle plate, the trapezoidal space has the same function with the reducing pipe, so that the flow velocity of low-temperature oxygen-enriched flue gas entering the trapezoidal space through the first inlet is as uniform as possible when the low-temperature oxygen-enriched flue gas enters the flue gas shunting pipe, the static pressure inside the first inlet and the upper flue gas chamber is uniformly distributed, meanwhile, the flow velocity of the low-temperature oxygen-enriched flue gas in the space is also uniform as possible when the middle flue gas chamber is gradually reduced from the second inlet to the tail end space, the static pressure inside the second inlet and the middle flue gas chamber is uniformly distributed, the flue gas exhausted to the lower flue gas chamber is uniformly distributed in the section of the lower flue gas chamber, meanwhile, the inclined structure is simple to manufacture, the manufacturing cost is reduced, and the change can be flexibly adjusted according to the actual situation on site, with lower cost of change.
2. The flue gas flow dividing pipe and the positive grids have two different pipe diameters, the pipe diameter of the flue gas flow dividing pipe is 100mm, and the pipe diameter of the positive grids is 130-200 mm; the flue gas firstly enters the flue gas shunt tubes to reduce the initial speed of the air flow and is decomposed into a plurality of air flows through the flue gas shunt tubes arranged at equal intervals, and then enters the positive grids, so that the contact area before gas mixing is increased while the pressure drop is reduced, and the characteristics of uniform speed and uniform temperature distribution are achieved before the gas mixing, so that the subsequent mixing efficiency is improved, and the mixing effect is enhanced.
3. The working principle of the gas shunting of the negative square grids and the flue gas shunt pipe is the same, the flue gas is sintered into a plurality of equal small air flows through equal division, the subsequent mixing efficiency is further improved under the condition that the speed, the temperature, the pressure and the like of each air flow are basically the same, and the mixing effect is enhanced.
4. The positive square grids and the negative square grids are square pipes, are parallel to the box body and are vertically arranged. The design reduces the probability of forming turbulence before gas mixing, reduces the turbulence degree of gas, and ensures that the flow direction of the mixed gas of two types of flue gas is basically kept consistent, thereby realizing the uniform distribution of each component, especially oxygen, after the gas mixing.
Therefore, when the sintering flue gas and the ring cooling flue gas are mixed, the device of the invention ensures that each source gas is uniformly decomposed into a plurality of small flows by adding a plurality of shunt pipes in the flue gas mixer, ensures that each flow is approximately convenient to be subsequently mixed, reduces the turbulence degree when the gas is shunted by changing the pipe shape of the shunt pipes into a square pipe, and ensures the consistency of the flow direction of the mixed gas, thereby ensuring the uniform distribution of each point of the oxygen concentration in the mixed gas, reduces the gas pressure loss by the multi-pipe diameter design, ensures that the contact area is indirectly increased before the plurality of flows converge, further improves the mixing efficiency, has the characteristics of uniform distribution of the oxygen concentration of the mixed flue gas, small running resistance, small volume, low running cost, simple structure and the like, and has good industrial application prospect.
5. A plurality of flue gas shunting mixers are arranged on the sintering machine along the traveling direction, a branch pipe of a ring cold flue gas pipeline is connected to a first inlet of each flue gas shunting device, a branch pipe of a sintering flue gas pipeline is connected to a second inlet of each flue gas shunting device, an electric control valve and a flowmeter are arranged on the branch pipe, a pressure gauge, a thermometer, an oxygen content monitoring meter and a gas flowmeter are arranged on the sintering flue gas pipeline and the ring cold flue gas pipeline, the electric control valves on the branch pipes are operated by a controller to accurately control the gas flow in each branch pipe so as to meet the circulating air volume required by each sintering belt, and the oxygen content of the flue gas after mixing is controlled on the basis of controlling the sintering flue gas volume and the ring cold flue gas volume entering the flue gas shunting mixers. The circular cooling flue gas is directly mixed with the sintering flue gas with slightly low oxygen content without supplementing oxygen, so that the oxygen content of the mixed flue gas is more than 18 percent, the most uniform mixing effect is achieved, the requirement of the mixed flue gas on the lowest oxygen content during sintering is met, and the waste heat of the sintering flue gas with slightly low oxygen content is fully utilized.
Drawings
FIG. 1 is a partial top view of an integrated sintering flue gas external circulation system;
FIG. 2 is a front three-axis side perspective view of the flue gas splitter mixer of FIG. 1 in accordance with the present invention;
FIG. 3 is a cross-sectional view of the flue gas splitter mixer of FIG. 1 in accordance with the present invention;
FIG. 4 is a diagram of the structure of a honeycomb flue gas distribution pipe group (including a first flue gas partition plate and a second flue gas partition plate) inside the flue gas distribution mixer of FIG. 1 according to the present invention;
FIG. 5 is a line graph showing the oxygen content distribution in the flue gas bypass mixer of example 1 of FIG. 1 according to the present invention;
FIG. 6 is a line graph showing the oxygen content distribution in the flue gas bypass mixer of example 2 of FIG. 1 according to the present invention;
FIG. 7 is a diagram showing the oxygen content distribution of the mixed gas of five groups of ring-cooled flue gas and high-temperature sulfur-containing gas at different flow rates in example 3 of the present invention;
FIG. 8 is a sample point distribution plot;
FIG. 9 is a sample line profile;
FIG. 10 is a flow diagram of an internal recycle process;
FIG. 11 is a flow diagram of an external circulation process;
FIG. 12 is a process flow diagram of the integrated sintering flue gas external circulation system of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention is clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
The invention is further described below with reference to the accompanying drawings.
Example 1
Fig. 1 is a partial plan view of an integrated sintering flue gas external circulation system near a flue gas diversion mixer, as shown in fig. 1, the flue gas diversion pipeline comprises a ring-cooling flue gas diversion pipeline 16 and a sintering flue gas diversion pipeline 13, a plurality of flue gas inlet branches are arranged on the two gas inlet pipelines, a plurality of flue gas diversion mixers 14 are arranged above a sintering pallet 12 along the advancing direction of the sintering pallet, for the flue gas diversion mixers 14, the lower parts of the flue gas diversion mixers are provided with square horn-shaped flue gas hoods 32, first inlets 24 and second inlets 30 on the upper parts of the flue gas diversion mixers are respectively arranged on two opposite side surfaces of a box body of the flue gas diversion mixers 14, and the number of the flue gas diversion mixers is increased and decreased according to actual field requirements. The sintering flue gas pipeline 13 and the annular cooling flue gas pipeline 16 are respectively connected with the first inlet 24 through the branch circuits and the second inlet 30, each branch circuit is provided with an electric control valve 11, a body flow meter 10 and a thermometer 2, and the electric control valve 11 plays a role in accurately controlling the air input of the sintering flue gas and the annular cooling flue gas in real time. The width of the trumpet-shaped flue gas hood 32 is matched with the width of the sintering machine trolley surface, so that the flue gas hoods can completely cover the upper surface of the sintering machine trolley after each flue gas shunting mixer 14 is sequentially arranged along the upper surface of the sintering machine trolley 12, and parts marked 22 and 23 in the figure 1 are flanges.
As shown in fig. 2, 3 and 4, the flue gas diversion mixer 14 is composed of a first inlet, a second inlet, an upper flue gas chamber 26, a middle flue gas chamber 25, a lower flue gas chamber 36, a first flue gas partition plate 28, a second flue gas partition plate 31, a flue gas diversion pipe 27, a square trumpet-shaped flue gas cover 32 and a honeycomb flue gas diversion pipe group 37; the upper flue gas chamber 26 and the middle flue gas chamber 25 are separated by a first partition plate 28, the middle flue gas chamber 25 and the lower flue gas chamber 36 are separated by a second partition plate 31, the upper flue gas chamber 26 is connected with a first inlet 24, the middle flue gas chamber 25 is connected with a second inlet 30, the grid group is formed by staggering x columns of longitudinal partition plates 29 and y rows of transverse partition plates 35, and x multiplied by y rectangular grids are separated in the lower flue gas chamber, wherein one half of the grids are female grids 33, the other half of the grids are male grids 34, the male grids 34 are communicated with the upper flue gas chamber 26 through a flue gas shunt pipe 27, the female grids 33 are communicated with the middle flue gas chamber 25 through holes formed in the second flue gas partition plate 31, and the cross section of the flue gas shunt pipe 27 is smaller than the male grids 34. The female grids 33 and the male grids 34 are alternately arranged in the longitudinal direction and the transverse direction which are perpendicular to each other and are x y rectangular grids, and the heights of the female grids 33 and the male grids 34 are smaller than that of the lower flue gas chamber 36, so that a proper space is reserved for fully mixing the sintering waste gas. The first inlet 24 is the same as the second inlet 30 in size, is a horn-shaped square tube in shape, and has a small caliber at one end far away from the side of the flue gas diversion mixer box body and a large caliber at one end connected with the box body. The first flue gas baffle plate 28 and the top of the box body of the flue gas diversion mixer 14 form an acute angle of less than 10 degrees but are not parallel to the top of the box body, the second flue gas baffle plate 31 is parallel to the top of the box body, so that the distance between the first flue gas baffle plate 28 and the top surface of the upper flue gas chamber 26 is sequentially decreased in the direction from the first inlet 24 side of the upper flue gas chamber to the second inlet 30 side of the middle flue gas chamber, and the distance between the first flue gas baffle plate 28 and the second flue gas baffle plate 31 is sequentially increased in the direction from the first inlet 24 side of the upper flue gas chamber to the second inlet 30 side of the middle flue gas chamber, so that the upper flue gas chamber 26 and the middle flue gas chamber 25 form a trapezoidal space to play a role in controlling the gas flow rate and pressure; for flue gas reposition of redundant personnel 27 between No. one flue gas baffle 28 and No. two flue gas baffles 31, arrange and correspond the intercommunication with below positive square 34 along flue gas reposition of redundant personnel blender 14 box vertical direction equidistance, along the first entry 24 in upper portion to the 30 directions of second entry: the length of the pipe is increased in sequence, the flow velocity in the pipe is increased in sequence, the flow rate of the gas flowing in the pipe in unit time is increased in sequence, and the heat exchange area of the flue gas which is in the pipe in unit time and has different temperature entering through the second inlet 30 and penetrates through the pipe wall of the flue gas shunt pipe 27 is larger.
When the ring-cooled flue gas and the sintered flue gas respectively enter the upper flue gas chamber and the middle flue gas chamber from the first inlet 24 and the second inlet 30 and are mixed in the lower flue gas mixing chamber, according to the principle of gas splitting in the collecting flue in the fluid mechanics principle, when a plurality of branch pipes are arranged on the main pipe along the length direction of the main pipe, the partial pressure at the branch pipe position closer to the terminal end of the main pipe is larger, therefore, when the flow cross-sectional areas of the plurality of branch pipes are equal, the flow rate of the branch pipe closer to the terminal end of the main pipe is larger, therefore, the ring-cooled flue gas enters the upper flue gas chamber from the first inlet and is closer to the second inlet, the ring-cooled flue gas entering the flue gas splitting pipe is more, and in the middle flue gas chamber, due to the resistance effect of the flue gas splitting pipe, the resistance at the position closer to the second inlet is smaller, the sintered flue gas more easily enters the female grid at the position closer to the second inlet, therefore, the area of heat exchange of the ring-shaped cold flue gas at the flue gas shunt pipe is larger at the position closer to the second inlet, and the ring-shaped cold flue gas is mixed with more sintering flue gas at the corresponding position, the area of heat exchange of the ring-shaped cold flue gas at the flue gas shunt pipe is smaller at the position closer to the first inlet, the ring-shaped cold flue gas entering the flue gas shunt pipe is less at the time, less sintering flue gas at the corresponding position enters the female square grids, and finally flue gas below each female square grid and the male square grids after entering the lower flue gas mixing chamber is uniformly mixed and has uniform temperature.
In addition, because the trapezoidal spaces of the upper flue gas chamber and the middle flue gas chamber are opened to the effect of the reducing pipes, the phenomenon that airflow is divided and distributed unevenly in the collecting flue is effectively counteracted, so that the gas entering the upper flue gas chamber from the first inlet can be distributed to the flue gas dividing pipes close to the first inlet more, and the gas entering the middle flue gas chamber from the second inlet can be distributed to the flue gas dividing pipes close to the second inlet more.
In this example 1, the ring-cooled flue gas with low temperature and high oxygen content is selected to be introduced into the first inlet 24, and the sintering flue gas with high temperature, low sulfur content and relatively high oxygen content is selected to be introduced into the second inlet 30. The ring-cooled flue gas enters the upper flue gas chamber 26 through the first inlet 24, then enters the flue gas shunt tube 27 through the through holes on the first flue gas partition plate 28, is decomposed into a plurality of small air flows, then enters the male square grids 34, and then enters the lower flue gas chamber 36 through the male square grids 34; the sintering flue gas enters the middle flue gas chamber 25 through the second inlet 30, then enters the female grid 33, is decomposed into a plurality of small air flows, and then enters the lower flue gas chamber 36; finally, the ring-cooled flue gas, which is split into a plurality of small gas streams, is thoroughly mixed with the sinter flue gas in the lower flue gas chamber 36.
As shown in FIG. 12, in the integrated sintering flue gas external circulation system, the inlet of the annular cooling flue gas pipeline 16 is connected with the flue gas of the annular cooler 20-1A gas outlet, an outlet is connected with the first inlet 24, an inlet of the sintering flue gas pipeline 13 is connected with the low-sulfur flue gas flue 7, an outlet is connected with the second inlet 30, and the sintering machine is sequentially divided into an ignition area, a circular cooling flue gas area and SO along the advancing direction of the sintering machine trolley 122Region of rapid rise in concentration, SO25 areas such as a concentration rapid reduction area, a sintering flue gas area and the like, an inlet and ignition area of the low-sulfur flue gas flue 7, an annular cooling flue gas area and an SO2The outlet of the lower air box 21 of the concentration rapid reduction area and the sintering flue gas area is connected, and the outlet is connected to a chimney through a desulfurization system; ring cold flue gas zone, SO2Region of rapid rise in concentration, SO2The lower wind box 21 in the region with the rapidly increased concentration is connected to a chimney through a high-sulfur flue gas duct 8 and a desulfurization system; the sintering flue gas pipeline 13 and the ring cooling flue gas pipeline 16 are provided with a pressure gauge 3, a thermometer 2, an oxygen content monitor 1, a gas flowmeter 10 and a circulating fan 9, the sintering flue gas pipeline 13 is connected with a branch pipe of the second inlet, and the ring cooling flue gas pipeline 16 is connected with a branch pipe of the first inlet, and the electric control valve 11, the gas flowmeter 10 and the oxygen content monitor 1 are respectively in signal connection with the controller. The low-sulfur flue gas flue 7 and the high-sulfur flue gas flue 8 are respectively provided with a dust remover 6, a fan 4, an annular cooling flue gas area and SO2And a branch pipeline for connecting the lower air box 21 of the region with the low-sulfur flue gas flue 7 and the high-sulfur flue gas flue 8 is provided with a switching valve 15, and the switching valve 15 is used for selectively sending the flue gas into the low-sulfur flue gas flue 7 or the high-sulfur flue gas flue 8 according to the sulfide content of the flue gas pumped into the lower air box by the sintering mixture under different working conditions.
As shown in figure 1, the sintering waste gas blown in through the ring cold flue gas diversion pipeline 16 and the sintering flue gas diversion pipeline 13 enters each branch pipe and enters the flue gas diversion mixer 14 under the precise control of the electric control valve 11 for full, the circulating flue gas after being fully and uniformly mixed is continuously introduced into the sintering machine trolley surface 12 to assist the sintering of the sintering mineral aggregate in the sintering machine trolley, and then is pumped out through each fan on the air outlet pipeline through the air box 21 at the bottom of the sintering machine trolley, the available dedusted high-temperature low-sulfur flue gas and the low-temperature oxygen-enriched ring-cooled flue gas at the ring cooler are respectively pumped into the first inlet 13 and the second inlet 16 through circulating fans on all air inlet pipelines and enter the subsequent circulating process flow again to participate in flue gas circulation, and for the sintering waste gas with high sulfur content, the sintering waste gas enters a desulfurization system for desulfurization after being dedusted by a deduster, and the gas is discharged from a chimney after reaching the emission standard.
In order to verify the flue gas mixing performance of the flue gas shunting mixer used in the flue gas inlet and mixing process in embodiment 1 of the present invention, the flue gas shunting mixer in embodiment 1 of the present invention is subjected to numerical simulation calculation, and the contents are as follows:
(1) setting operation parameters: in the embodiment, a first inlet is provided for introducing a first gas, and the components and the operating parameters of the first gas are shown in a table 1, so that the lower-temperature oxygen-enriched ring cold flue gas is simulated; a second inlet is arranged to introduce second gas, and the components and the operation parameters of the second gas are shown in the table 1, so that the sintering flue gas with lower sulfur and higher temperature is simulated; wherein the flue gas split mixer operating pressure is set to 101325 Pa.
TABLE 1 gas composition and operating parameters
| Species of | Speed (m/s) | Temperature (k) | O2wt％ | COwt％ | CO2wt％ | N2wt％ |
| Gas I | 20 | 413.15 | 23 | 0.5 | 3 | 75 |
| |
20 | 573.15 | 16 | 0.5 | 3 | 75 |
(2) Testing the oxygen concentration uniform distribution performance of the outlet end face of the square horn-shaped flue gas hood: and obtaining an oxygen volume fraction distribution result at the outlet end face of the flue gas cover of the lower flue gas chamber according to simulation calculation, uniformly collecting 99 sample points from the end face, and calculating to obtain an average value and a standard deviation of the oxygen volume fraction so as to measure the oxygen uniform distribution, wherein the sample point data, the average value and the standard deviation are shown in a table 2-1. In order to more visually represent the uniform distribution of oxygen concentration on each height of the outlet end face of the flue gas cover of the lower flue gas chamber, five equidistant sampling lines are arranged from the outlet face, each sampling line comprises eight sampling points at equal intervals, the five sampling lines are arranged in the same horizontal plane, the distribution diagrams of the sampling lines and the sampling points are shown in figures 8 and 9, the area in a black line frame is the outlet end face of the flue gas cover of the lower flue gas chamber, the data of the sampling lines and the sampling points are shown in tables 2-2, and the drawing comparison is carried out according to the data, and the figure 12 is shown.
TABLE 2-1 oxygen volume fraction, mean and standard deviation
TABLE 2-2 sample line sample point data
As shown in table 1, table 2-2, and fig. 5, the data and the graphs show that the average value of the oxygen volume fraction at the outlet end face of the flue gas hood of the lower flue gas chamber is about 0.183, the standard deviation is 0.005, and the fluctuation of the oxygen volume fraction at each height of the outlet end face of the flue gas hood is small and stabilized at about 0.180, when the gas flow velocities at the first inlet and the second inlet are both 20m/s, the first flue gas temperature is 413.15k, the second flue gas temperature is 573.15k, and the operating pressure is 101325 Pa. This example verifies that the flue gas diversion mixer has the characteristics of uniform distribution of the oxygen concentration of the mixed circulating flue gas, and the average value of the oxygen content (volume fraction) is excellent and meets the requirement of the optimal oxygen content of the circulating flue gas that the oxygen content is equal to 18%.
Example 2
In this example 2, the high temperature, low sulfur content and relatively high oxygen content flue gas is selected to be introduced into the first inlet 24, and the low temperature and high oxygen content flue gas is selected to be introduced into the second inlet 30. Sintering flue gas enters an upper flue gas chamber 26 through a first inlet 24, then enters a flue gas shunt pipe 27 through a through hole in a first flue gas partition plate 28, is split into a plurality of small flows, then enters an anode square grid 34, and then enters a lower flue gas chamber 36 through the anode square grid 34; the ring-cooled flue gas enters the middle flue gas chamber 25 through the second inlet 30, then enters the negative square grid 33, is decomposed into a plurality of small gas flows, and then enters the lower flue gas chamber 36; finally, the ring-cooled flue gas, which is split into a plurality of small gas streams, is thoroughly mixed with the sinter flue gas in the lower flue gas chamber 36. As shown in figure 1, the sintering waste gas blown in through the annular cold flue gas pipeline 16 and the sintering flue gas pipeline 13 enters each branch pipe and enters the flue gas shunting mixer 14 under the precise control of the electric control valve 11 for sufficient, the circulating flue gas after being fully and uniformly mixed is continuously introduced into the sintering machine trolley surface 12 to assist the sintering of the sintering mineral aggregate in the sintering machine trolley, and then is pumped out through the air box 21 at the bottom of the sintering machine trolley through each fan on the air outlet pipeline, the available high-temperature low-sulfur flue gas after dust removal and low-temperature oxygen-enriched ring-cooling flue gas at the ring cooling machine are respectively pumped into a sintering flue gas pipeline 13 and a ring-cooling flue gas pipeline 16 through circulating fans on all gas inlet pipelines, and the high-sulfur sintering waste gas enters a desulfurization system for desulfurization after being dedusted by a deduster, and is discharged from a chimney after the gas reaches the emission standard.
In order to verify the flue gas mixing performance of the flue gas shunting mixer used in the flue gas inlet and mixing process in embodiment 2 of the present invention, the flue gas shunting mixer in embodiment 2 of the present invention is subjected to numerical simulation calculation, and the contents are as follows:
(1) setting operation parameters: in the embodiment, the second inlet is provided with the first gas, and the components and the operation parameters of the first gas are shown in the table 3, so that the lower-temperature oxygen-enriched ring cold flue gas is simulated; a first inlet is arranged to introduce second gas, and the components and the operation parameters of the second gas are shown in a table 3, so that the sintering flue gas with lower sulfur and higher temperature is simulated; wherein the flue gas split mixer operating pressure is set to 101325 Pa.
TABLE 3 gas composition and operating parameters
| Species of | Speed (m/s) | Temperature (k) | O2wt％ | CO wt％ | CO2 wt％ | N2 wt％ |
| Gas I | 20 | 413.15 | 23 | 0.5 | 3 | 75 |
| |
20 | 573.15 | 16 | 0.5 | 3 | 75 |
(2) Testing the oxygen concentration uniform distribution performance of the outlet end face of the square horn-shaped flue gas hood: and obtaining an oxygen volume fraction distribution result at the outlet end face of the flue gas cover of the lower flue gas chamber according to simulation calculation, uniformly collecting 99 sample points from the end face, and calculating to obtain an average value and a standard deviation of the oxygen volume fraction so as to measure the oxygen uniform distribution, wherein the sample point data, the average value and the standard deviation are shown in a table 4-1. In order to more visually represent the uniform distribution of oxygen concentration on each height of the outlet end face of the flue gas cover of the lower flue gas chamber, five equidistant sampling lines are arranged from the outlet face, each sampling line comprises eight sampling points at equal intervals, the five sampling lines are arranged in the same horizontal plane, the distribution diagrams of the sampling lines and the sampling points are shown in figures 8 and 9, the area in a black line frame is the outlet end face of the flue gas cover of the lower flue gas chamber, the data of the sampling lines and the sampling points are shown in a table 4-2, and the data are plotted and compared with the data, which is shown in figure 6.
TABLE 4-1 oxygen volume fraction, mean and standard deviation
TABLE 4-2 sample line sample point data
As shown in table 3, table 4-1, table 4-2, and fig. 6, the data and the graph show that the average value of the oxygen volume fraction at the outlet end face of the flue gas hood of the lower flue gas chamber is about 0.178, the standard deviation is 0.005, and the fluctuation of the oxygen volume fraction at each height of the outlet end face of the flue gas hood is small and stabilized at about 0.180, when the gas flow velocities at the first inlet and the second inlet are both 20m/s, the first flue gas temperature is 413.15k, the second flue gas temperature is 573.15k, and the operating pressure is 101325 Pa. This example demonstrates that the flue gas split-flow mixer has the characteristic of uniform distribution of the oxygen concentration of the mixed circulating flue gas, and the average value of the oxygen content (volume fraction) is excellent enough to meet the requirement of the optimal oxygen content of the circulating flue gas equal to 18%.
It can be seen from the combination of the embodiment 1 and the embodiment 2 that the sintering flue gas or the ring-cooling flue gas can be fed through the first inlet and the second inlet of the flue gas split-flow mixer, and the selection of the flue gas split-flow pipe on the flue gas split-flow mixer does not affect the distribution uniformity of the oxygen content of the mixed circulating flue gas, thereby proving the characteristics of the invention in process improvement, such as easy operation, flexible change and easy modification.
Example 3
In this example 3, the ring-cooled flue gas with low temperature and high oxygen content is introduced into the first inlet 24, and five groups of sintering flue gases with high temperature, low sulfur content and relatively high oxygen content are introduced into the second inlet 30 at different flow rates, wherein the flow rates of the five groups are respectively 10m/s, 15m/s, 20m/s, 25m/s and 30m/s, and the flow rates are sequentially increased linearly. The ring-cooled flue gas enters the upper flue gas chamber 26 through the first inlet 24, then enters the flue gas shunt pipe 27 through a through hole in the first flue gas partition plate 28, which is connected with the flue gas shunt pipe 27, is decomposed into a plurality of small flows, then enters the positive square grids 34, and finally enters the lower flue gas chamber 36 through the positive square grids 34; the sintering flue gas enters the middle flue gas chamber 25 through the second inlet 30, then enters the female grid 33, is decomposed into a plurality of small gas flows, and then enters the lower flue gas chamber 36; finally, the ring-cooled flue gas, which is split into a plurality of small gas streams, is thoroughly mixed with the sinter flue gas in the lower flue gas chamber 36.
In order to verify the flue gas mixing performance of the flue gas shunting mixer used in the flue gas inlet and mixing process in embodiment 3 of the present invention under the influence of different inlet speeds, the flue gas shunting mixer in embodiment 3 of the present invention is subjected to numerical simulation calculation, and the contents are as follows:
(1) setting operation parameters: in the embodiment, the first inlet is provided with the first gas, and the components and the operation parameters of the first gas are shown in the table 5, so that the lower-temperature oxygen-enriched ring cold flue gas is simulated; a second inlet is arranged to introduce second gas, and the components and the operation parameters of the second gas are shown in the table 1, so that the sintering flue gas with lower sulfur and higher temperature is simulated; wherein the operating pressure of the flue gas diversion mixer is set to 101325 Pa; the incoming gas distribution in the five control experiments was: the first gas and the second gas 1 are a first group, the first gas and the second gas 2 are a second group, the first gas and the second gas 3 are a third group, the first gas and the second gas 4 are a fourth group, and the first gas and the second gas 5 are a fifth group.
TABLE 5 gas composition and operating parameters
| Species of | Speed (m/s) | Temperature (k) | O2wt％ | CO wt％ | CO2 wt％ | N2 wt％ |
| Gas I | 20 | 413.15 | 23 | 0.5 | 3 | 75 |
| Gas 2 | 10 | 573.15 | 16 | 0.5 | 3 | 75 |
| Gas 2 | 15 | 573.15 | 16 | 0.5 | 3 | 75 |
| Gas 2 | 20 | 573.15 | 16 | 0.5 | 3 | 75 |
| Gas 2 | 25 | 573.15 | 16 | 0.5 | 3 | 75 |
| Gas No. 5 | 30 | 573.15 | 16 | 0.5 | 3 | 75 |
(2) Testing the oxygen concentration uniform distribution performance of the outlet end face of the square horn-shaped flue gas hood: and obtaining an oxygen volume fraction distribution result at the outlet end face of the flue gas hood of the lower flue gas chamber according to simulation calculation, uniformly collecting 99 sample points from the end face, and calculating to obtain an average value and a standard deviation of the oxygen volume fraction so as to measure the oxygen equipartition, wherein the data, the average value and the standard deviation of each group of sample points are shown in tables 6-1, 6-2, 6-3, 6-4 and 6-5. In order to more visually represent the influence of five groups of different air inlet speeds on the average oxygen content of the mixed flue gas, a drawing is used for more visually comparing the five groups of different air inlet speeds, and the drawing is shown in figure 7.
TABLE 6-1 first group oxygen volume fraction, mean and standard deviation
TABLE 6-2 second group oxygen volume fraction, mean and standard deviation
TABLE 6-3 third group oxygen volume fraction, mean and standard deviation
TABLE 6-4 fourth group oxygen volume fraction, mean and standard deviation
Tables 6-5 fifth group oxygen volume fraction, mean and standard deviation
As shown in tables 6-1, 6-2, 6-3, 6-4, 6-5 and 7, the data and the graphs indicate that in five groups of control tests, when the flow rates of the first inlet gas flow are both 20m/s, and the flow rates of the second inlet gas flow are respectively 10m/s, 15m/s, 20m/s, 25m/s and 30m/s, the flow rates are sequentially and linearly increased, the first flue gas temperature is 413.15k, the second flue gas temperature is 573.15k, and the operating pressure is 101325Pa, the average value of the oxygen volume fractions at the outlet end face of the flue gas hood of the lower flue gas chamber is between 0.177 and 0.193, the standard deviation is between 0.0046 and 0.0053, the average value of the oxygen volume fractions shows a slightly decreasing linear relation with the continuous increase of the flow rate of the second flue gas (simulated high-temperature low-sulfur-containing sintered flue gas), and the average value of the oxygen volume fractions shows slightly decreasing linear relations with the flow rates of the second flue gas flow rate at the inlet of the flue gas split-flow mixer in five groups of control tests The flow velocity is increased and linearly decreases, for the standard deviation, the influence of the standard deviation of each group caused by the change of the flow velocity of the flue gas inlet in the five groups of control tests can be ignored, and the standard deviation of the five groups of tests is stable to be about 0.005.
By integrating the data and the graphs, the embodiment verifies that the flue gas shunting mixer has the characteristic of uniform distribution of the oxygen concentration of the mixed circulating flue gas, and the oxygen content of the mixed flue gas is in a steady descending trend along with the increase of the flow velocity of the flue gas at the inlet of the flue gas shunting mixer in the process of dynamically adjusting the wind speed by the electric control valve; meanwhile, the dynamic adjustment process of the flue gas flow velocity at the inlet of the flue gas shunting mixer has no influence on the distribution uniformity of the oxygen concentration in the mixed circulating flue gas. According to five groups of comparison tests, the five groups of comparison tests prove that when the oxygen content and the temperature of the two types of flue gas to be mixed are shown in the table 5, and when the speeds of the two types of flue gas to be mixed are similar, the mixing effect is optimal, and the oxygen content (volume fraction) is 18% under the condition of ensuring uniform distribution of oxygen concentration. The embodiment also verifies the characteristic of simple process of the invention and the high efficiency of the integrated flow of the air inlet, mixing and discharge of the circulating flue gas. The flue gas shunting mixer can realize the adjustment of dynamic air inflow under the adjustment of the electric control valve and basically does not influence the distribution uniformity of the oxygen concentration, so the conditions that the local process is stopped when the process adjustment is carried out on the oxygen content and the uniformity of the circulating flue gas and the overall production operation is influenced can be avoided, the air inflow, the mixing and the recycling are realized, and the purposes of energy conservation and emission reduction are achieved.
Claims (8)
1. An integrated sintering flue gas external circulation system, which is used for providing oxygen-containing circulation gas for a sintering machine trolley (12) and desulfurizing and purifying high-sulfur flue gas discharged by the sintering machine trolley (12), and is characterized by comprising:
air inlet pipeline, including sintering flue gas pipeline (13), ring cold flue gas pipeline (16), flue gas reposition of redundant personnel blender (14), install flue gas reposition of redundant personnel blender (14) on sintering machine platform truck (12), flue gas reposition of redundant personnel blender (14) are equipped with first entry, second entry and mix the wind export, the export of flue gas of ring cold flue gas pipeline (16) entry linkage ring cold machine (20-1), exit linkage first entry, the entry linkage low sulfur flue gas flue (7) of sintering flue gas pipeline (13), exit linkage the second entry divide into ignition region, ring cold flue gas region, the sintering machine in proper order along sintering machine platform truck (12) advancing direction,SO2Region of rapid rise in concentration, SO25 areas such as a concentration rapid reduction area, a sintering flue gas area and the like, an inlet and ignition area of the low-sulfur flue gas flue (7), an annular cooling flue gas area and an SO (sulfur oxide) area2The outlet of a lower air box (21) of the concentration rapid reduction area and the sintering flue gas area is connected, and the outlet is connected to a chimney through a desulfurization system; ring cold flue gas zone, SO2Region of rapid rise in concentration, SO2The lower wind box (21) in the region with the rapidly increased concentration is connected to a chimney through a high-sulfur flue gas flue (8) and a desulfurization system;
a plurality of flue gas shunting mixers (14) are arranged along the advancing direction of a sintering machine trolley (12), an upper flue gas chamber (26), a middle flue gas chamber (25) and a lower flue gas chamber (36) are arranged in each flue gas shunting mixer (14), a square trumpet-shaped flue gas cover (32) is arranged at the gas outlet of each lower flue gas chamber (36) and is tightly attached to the surface (12) of the sintering machine trolley, each upper flue gas chamber (26) is separated from each middle flue gas chamber (25) through a first partition plate (28), each middle flue gas chamber (25) is separated from each lower flue gas chamber (36) through a second partition plate (31), each upper flue gas chamber (26) is connected with a first inlet (24), and each middle flue gas chamber (25) is connected with a second inlet (30); the bottom surface of the second flue gas partition plate (31) is connected with n columns of longitudinal partition plates (29) and m rows of transverse partition plates (35) which are arranged along the vertical direction of the box body side, the longitudinal partition plates (29) and the transverse partition plates (35) are mutually staggered and divide into x y rectangular grids in the lower flue gas chamber (36), and the x y rectangular grids jointly form a honeycomb flue gas shunt pipe group (37); half of the x y rectangular grids are female grids (33), the other half of the x y rectangular grids are male grids (34), the female grids (33) and the male grids (34) are alternately arranged in the longitudinal direction and the transverse direction of the x y rectangular grids, the female grids (33) are communicated with the middle flue gas chamber (25) through holes formed in the second flue gas partition plate (31), and the male grids (34) are communicated with the upper flue gas chamber (26) through a flue gas shunt pipe (27);
the controller, be equipped with manometer (3), thermometer (2), oxygen content monitoring meter (1), gas flowmeter (10) and circulating fan (9) on sintering flue gas pipeline (13), ring cold flue gas pipeline (16), all be equipped with electric control valve (11) on the branch pipe of second entry is connected in sintering flue gas pipeline (13) and the branch pipe of ring cold flue gas pipeline (16) connection first entry, electric control valve (11), gas flowmeter (10) and oxygen content monitoring meter (1) respectively with controller signal connection.
2. The integrated sintering flue gas external circulation system according to claim 1, wherein a dust collector (6) and a fan (4) are arranged on the low-sulfur flue gas flue (7) and the high-sulfur flue gas flue (8).
3. The integrated sintering flue gas external circulation system of claim 1, wherein the ring-cooled flue gas region, SO2And a switching valve (15) is arranged on a branch pipeline connecting the lower air box (21) of the region with the rapidly reduced concentration with the low-sulfur flue gas duct (7) and the high-sulfur flue gas duct (8), and the switching valve (15) is used for selectively sending the flue gas into the low-sulfur flue gas duct (7) or the high-sulfur flue gas duct (8) according to the sulfide content of the sintering mixture pumped into the lower air box under different working conditions.
4. The integrated sintering flue gas external circulation system according to claim 1, wherein a gas flowmeter (10) and a thermometer (2) are arranged on a branch pipe of the sintering flue gas pipeline (13) connected with the second inlet and a branch pipe of the annular cooling flue gas pipeline (16) connected with the first inlet; the electric control valves (11) on each branch pipe are used for accurately controlling the gas flow in each branch pipe so as to meet the circulating air volume required by sintering, and controlling the oxygen content of the mixed flue gas on the basis of controlling the sintering flue gas volume and the annular cooling flue gas volume entering the flue gas shunting mixer (14).
5. The integrated sintering flue gas external circulation system according to claim 1, wherein the cross section of the trumpet-shaped flue gas cover (32) is as wide as the sintering machine trolley surface (12), and a sealing plate is arranged at the joint of the flue gas cover and the sintering machine trolley surface (12).
6. The integrated sintering flue gas external circulation system according to claim 1, wherein the first inlet and the second inlet of the flue gas diversion mixer (14) are respectively arranged on two opposite side surfaces of the box body, the distance between the first flue gas partition plate (28) and the top surface of the upper flue gas chamber (26) is gradually decreased in the direction from the first inlet (24) side of the upper flue gas chamber to the second inlet (30) side of the middle flue gas chamber, and the distance between the first flue gas partition plate (28) and the second flue gas partition plate (31) is gradually increased in the direction from the first inlet (24) side of the upper flue gas chamber to the second inlet (30) side of the middle flue gas chamber.
7. The integrated sintering flue gas external circulation system according to claim 6, wherein the cross-sectional area of the flue gas shunt pipe (27) in the flue gas shunt mixer (14) is smaller than that of the positive square grid (34), the cross-sectional area of the negative square grid (33) is the same as that of the positive square grid (34), and the height of the rectangular square grid in the vertical direction of the box body is smaller than that of the lower flue gas chamber (36).
8. The integrated sintering flue gas external circulation system according to claim 7, wherein an included angle between the first flue gas partition plate (28) and the upper flue gas chamber (26) in the flue gas diversion mixer (14) is an acute angle smaller than 20 degrees.
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