CN110953894A - Sintering machine flue gas circulation purification and waste heat utilization system and method - Google Patents
Sintering machine flue gas circulation purification and waste heat utilization system and method Download PDFInfo
- Publication number
- CN110953894A CN110953894A CN201911296747.5A CN201911296747A CN110953894A CN 110953894 A CN110953894 A CN 110953894A CN 201911296747 A CN201911296747 A CN 201911296747A CN 110953894 A CN110953894 A CN 110953894A
- Authority
- CN
- China
- Prior art keywords
- flue
- flue gas
- gas
- sintering machine
- waste heat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
-
- 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
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
- F27D17/002—Details of the installations, e.g. fume conduits or seals
-
- 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
-
- 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
-
- 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
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
-
- 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
Abstract
The invention belongs to the technical field of flue gas treatment in the steel industry, and particularly relates to a system and a method for circulating and purifying flue gas of a sintering machine and utilizing waste heat. The invention transfers the tail end treatment of the flue gas to the circulation process of the sintering flue gas, and compared with the combination of the common sintering flue gas circulation technology and a subsequent flue gas purification system, the invention can reduce the scale of a desulfurization reaction device and an SCR reactor to a great extent, thereby saving the cost of a desulfurizer matched with the desulfurization reaction device and the cost of a denitration catalyst matched with the SCR reactor, and further saving the investment cost and the operation cost during flue gas treatment. In addition, the smoke of the front section flue and the middle section flue with large smoke discharge amount participates in smoke circulation, and the air supplement device is arranged at the inlet of the smoke sealing cover to supplement oxygen, so that the smoke circulation proportion can be improved, and the problem of small smoke circulation proportion is solved.
Description
Technical Field
The invention belongs to the technical field of flue gas treatment in the steel industry, and particularly relates to a system and a method for circulating and purifying flue gas of a sintering machine and utilizing waste heat.
Background
The discharge amount of pollutants in the sintering process in the steel industry is large, and a sintering flue gas circulation technology is taken as an important mode for reducing the discharge amount of the pollutants, and various circulation processes are proposed at home and abroad. Wherein LEEP (Low Emission energy Optimized Sintering process), Eposint (abbreviation of environmental Optimized Sintering, meaning: environmental Optimized Sintering), EOS (abbreviation of Emission Optimized Sintering, meaning: energy Optimized Sintering technology) and New day iron (regional exhaust gas circulation process) are available abroad; enterprises such as China's steel, sand steel, first steel stock, Bao steel, Yong steel, migrating steel, long steel and the like are respectively implemented.
At present, in the existing circulation process and embodiment, the overall flue gas circulation ratio is within 30% (when the flue gas circulation amount is too large, on one hand, the charge level of the sintering machine is basically covered completely, and on the other hand, if the flue gas circulation amount is not controlled properly, the flue gas leakage accident is easy to happen), and the flue gas circulation ratio is small. In addition, the investment and operation costs of a subsequent flue gas desulfurization and denitration system matched with the flue gas circulation system of the sintering machine are high, and the enthusiasm of the steel enterprises for the environment-friendly project is influenced. Therefore, under the current economic large environment, how to improve the flue gas circulation ratio and reduce the flue gas treatment cost (investment and operation cost of flue gas desulfurization and denitration) becomes a difficult problem for people.
Disclosure of Invention
The invention provides a system and a method for circulating and purifying flue gas of a sintering machine and utilizing waste heat, which can solve the technical problems of small flue gas circulation proportion and high flue gas treatment cost in the prior art.
In order to solve the problems, the invention provides a system and a method for circulating and purifying flue gas of a sintering machine and utilizing waste heat, and the technical scheme is as follows:
the utility model provides a sintering machine flue gas circulation purifies and waste heat utilization system, includes: the device comprises a sintering machine main body, a smoke sealing cover covering the material surface of the sintering machine main body, an air box installed at the bottom of the sintering machine main body and a flue connected with the air box; the flue comprises a machine head flue, a front section flue, a middle section flue and a machine tail flue; one end of the middle-section flue is connected with the air box, and the other end of the middle-section flue is connected with the flue gas sealing cover; a desulfurization reaction device, a first dust remover and an air supply device are sequentially arranged on the middle section flue along the direction from the air box to the flue gas sealing cover; one end of the front section flue is connected with the air box, the other end of the front section flue is connected with the middle section flue, and a connection point is positioned between the desulfurization reaction device and the first dust remover; a first ammonia injection system and an SCR reactor are sequentially arranged on the front section flue and along the direction from the air box to the middle section flue; one end of the machine head flue is connected with the air box, the other end of the machine head flue is connected with the chimney, and a second dust remover is arranged on the machine head flue; and one end of the tail flue is connected with the air box, the other end of the tail flue is connected with the head flue, and the connecting point is positioned between the air box and the second dust remover.
The flue gas circulation purification and waste heat utilization system for the sintering machine as described above is further preferably: and the front section flue is also provided with a gas-gas heat exchanger, the gas-gas heat exchanger is positioned between the air box and the first ammonia injection device, and the gas-gas heat exchanger is connected with the tail flue.
The flue gas circulation purification and waste heat utilization system for the sintering machine as described above is further preferably: and a second ammonia injection system is further installed on the middle section flue, and the second ammonia injection system is positioned between the gas supplementing device and the flue gas sealing cover.
The flue gas circulation purification and waste heat utilization system for the sintering machine as described above is further preferably: the air supplement unit comprises an oxygen buffer tank and an oxygen uniform distributor, the oxygen buffer tank is used for storing pure oxygen, and the oxygen distributor is used for distributing oxygen to the middle flue.
The flue gas circulation purification and waste heat utilization system for the sintering machine as described above is further preferably: the middle section flue is also provided with a first fan, and the first fan is positioned between the first dust remover and the air supply device; and a second fan is also installed on the machine head flue and is positioned between the second dust remover and the chimney.
The flue gas circulation purification and waste heat utilization system for the sintering machine as described above is further preferably: and a CEMS analyzer is also arranged on the machine head flue and is positioned between the second fan and the chimney.
The flue gas circulation purification and waste heat utilization system for the sintering machine as described above is further preferably: and a nitrogen oxide concentration analyzer is also installed on the front section flue and is positioned between the first ammonia injection system and the SCR reactor.
The flue gas circulation purification and waste heat utilization system for the sintering machine as described above is further preferably: a first sulfur dioxide concentration analyzer and a second sulfur dioxide concentration analyzer are also arranged on the middle section flue; the first sulfur dioxide concentration analyzer is located between the air box and the desulfurization reaction device, and the second sulfur dioxide concentration analyzer is located between the first fan and the air supply device.
The flue gas circulation purification and waste heat utilization system for the sintering machine as described above is further preferably: the smoke sealing cover is provided with a pressure detection device, an oxygen concentration detection device and an air inlet branch pipe; the gas inlet branch pipe is used for communicating the flue gas sealing cover with the middle section flue, and the gas inlet branch pipe is provided with a regulating valve.
The flue gas circulation purification and waste heat utilization system for the sintering machine as described above is further preferably: the air inlet branch pipe, the pressure detection device and the oxygen concentration detection device are multiple, and the air inlet branch pipe, the pressure detection device and the oxygen concentration detection device correspond to one another one by one.
The flue gas circulation purification and waste heat utilization system for the sintering machine as described above is further preferably: the first dust remover is a bag-type dust remover.
The flue gas circulation purification and waste heat utilization system for the sintering machine as described above is further preferably: the second dust remover is an electric dust remover.
A sintering machine flue gas circulation purification and waste heat utilization method is realized based on a sintering machine flue gas circulation purification and waste heat utilization system, and comprises the following steps: covering a flue gas sealing cover on the sintering machine main body, and leading out flue gas of an air box at the bottom of the sintering machine main body from a machine head flue, a front section flue, a middle section flue and a machine tail flue respectively; connecting the middle section flue with the flue gas sealing cover, and arranging a desulfurization reaction device and a first dust remover on the middle section flue to treat the flue gas; merging the front section flue into the middle section flue, and arranging a first ammonia injection device and an SCR reactor on the front section flue to treat flue gas; connecting the machine head flue with a chimney, and arranging a second dust remover on the machine head flue to treat the flue gas; and merging the machine tail flue into the machine head flue.
The method for circulating and purifying flue gas of a sintering machine and utilizing waste heat as described above is further preferably: and a gas-gas heat exchanger is arranged on the front section flue, the machine tail flue is connected into the gas-gas heat exchanger, and the machine tail flue is used for supplying heat to the front section flue.
The method for circulating and purifying flue gas of a sintering machine and utilizing waste heat as described above is further preferably: and arranging an air supplementing device on the middle section flue to provide pure oxygen for the middle section flue, arranging a second ammonia injection system to inject ammonia into the middle section flue, and removing nitrogen oxides by using the temperature of a sinter bed of the sintering machine main body.
The method for circulating and purifying flue gas of a sintering machine and utilizing waste heat as described above is further preferably: the middle section flue is provided with a first fan, the machine head flue is provided with a second fan, the interior of the flue gas sealing cover is maintained to be in a micro negative pressure state through the first fan and the second fan, and the air pressure is smaller than the standard atmospheric pressure of 0Pa to 200 Pa.
Analysis shows that compared with the prior art, the invention has the advantages and beneficial effects that:
according to the invention, the tail end treatment of the flue gas is transferred to the circulation process of the flue gas, so that pollutants in the flue gas can be enriched and internally removed, the sintering flue gas process control and the tail end treatment are combined, the flue gas is comprehensively treated, the investment cost and the operation cost in flue gas treatment can be saved, and a desulfurization and denitrification purification device is not required to be arranged on an external exhaust flue (a machine head flue). In addition, pure oxygen is adopted for oxygen supplementation, smoke with large smoke quantity in the front section flue and the middle section flue is set for smoke circulation, the smoke circulation proportion can be greatly improved, and the smoke circulation proportion is improved to more than 65%. In addition, the SCR and SNCR denitration are organically combined, and the sintering material layer of the sintering machine main body is utilized to provide a heat source for the SNCR denitration reaction, so that the heat source is saved, and the denitration effect can be improved.
Drawings
FIG. 1 is a schematic connection diagram of a flue gas circulation purification and waste heat utilization system of a sintering machine according to the present invention.
Fig. 2 is a schematic view of the connection between the main body of the sintering machine and the flue gas sealing cover according to the present invention.
FIG. 3 is a first drawing of a prior art bellows flue gas test of a sintering machine with 22 bellows flues.
FIG. 4 is a second drawing of a test of the flue gas from a windbox of a sintering machine with 22 windbox flues according to the prior art.
In the figure: 1-sintering machine main body; 2-front section flue; 3-flue gas sealing cover; 4-middle flue; 5-a second ammonia injection system; 6-oxygen uniform distributor; 7-an oxygen buffer tank; 8-a gas supplementing device; 9-a first dust remover; 10-a second sulfur dioxide concentration analyzer; 11-a first ammonia injection system; a 12-oxynitride concentration analyzer; 13-an SCR reactor; 14-a first fan; 15-a chimney; 16-CEMS analyzer; 17-a second fan; 18-a second precipitator; 19-tail flue; 20-gas heat exchanger; 21-a desulfurization reaction device; 22-a first sulphur dioxide concentration analyser; 23-machine head flue; 24-a pressure detection device; 25-oxygen concentration detection means; 26-a regulating valve; 27-intake manifold.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected" and "connected" used herein should be interpreted broadly, and may include, for example, a fixed connection or a detachable connection; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
Referring to fig. 1 to 4, fig. 1 is a schematic connection diagram of a flue gas circulation purification and waste heat utilization system of a sintering machine according to the present invention; FIG. 2 is a schematic view of the connection of the main body of the sintering machine and the flue gas sealing hood of the present invention; FIG. 3 is a first drawing of a test of the flue gas from a bellows of a sintering machine with 22 bellows flues according to the prior art; FIG. 4 is a second drawing of a test of the flue gas from a windbox of a sintering machine with 22 windbox flues according to the prior art.
In the prior art, taking a sintering machine with 22 windbox flues as an example, the flue gas test results of the sintering machine windbox are shown in fig. 3 and 4. Specifically, as shown in fig. 3, T in the figure represents temperature, and the measurement unit is; SO2 represents sulfur dioxide, measured in ppm; NO represents nitric oxide, measured in ppm; the abscissa in the figure is the number of the windboxes, the left ordinate represents the temperature value and the right ordinate represents the contents of sulphur dioxide and nitrogen monoxide. As shown in fig. 4, O2 represents oxygen, in units; CO2 represents carbon dioxide, measured in%; CO represents carbon monoxide, and the measured unit is ppm; the abscissa in the figure represents the blower number, the left ordinate represents the oxygen percentage value, the first right ordinate represents the carbon dioxide percentage value and the second right ordinate represents the carbon monoxide content.
In the prior art, the machine head flue 23 is mainly used for discharging high-oxygen, low-temperature, low-dust and low-pollutant flue gas; the tail flue 19 is mainly used for discharging high-oxygen, high-temperature, low-dust and low-pollutant flue gas; the front section flue 2 is mainly used for discharging flue gas containing high-concentration carbon monoxide and high-concentration nitrogen oxide; the middle flue 4 is mainly used for discharging high-concentration sulfur dioxide flue gas. The smoke of the machine head flue 23 and the machine tail flue 19 is clean and can be directly discharged into the atmosphere after dust removal, and the technical personnel in the field can know the smoke.
As shown in fig. 1 and fig. 2, the invention provides a flue gas circulation purification and waste heat utilization system of a sintering machine, which mainly comprises a sintering machine main body 1, a flue gas sealing cover 3 covering the material surface of the sintering machine main body 1, an air box arranged at the bottom of the sintering machine main body 1, and a flue connected with the air box; the flue comprises a machine head flue 23, a front section flue 2, a middle section flue 4 and a machine tail flue 19; one end of the middle flue 4 is connected with the air box, and the other end is connected with the flue gas sealing cover 3; a desulfurization reaction device 21, a first dust remover 9 and an air supply device 8 are sequentially arranged on the middle section flue 4 along the direction from the air box to the flue gas sealing cover 3; one end of the front section flue 2 is connected with the air box, the other end of the front section flue is connected with the middle section flue 4, and the connection point is positioned between the desulfurization reaction device 21 and the first dust remover 9; a first ammonia injection system 11 and an SCR reactor 13 are sequentially arranged on the front section flue 2 along the direction from the air box to the middle section flue 4; one end of the machine head flue 23 is connected with the air box, the other end of the machine head flue 23 is connected with the chimney 15, and a second dust remover 18 is arranged on the machine head flue 23; one end of the tail flue 19 is connected with the air box, the other end of the tail flue is connected with the head flue 23, and the connection point is positioned between the air box and the second dust remover 18.
Specifically, in the present invention, the flue of the sintering machine is divided into a machine head flue 23, a front section flue 2, a middle section flue 4, and a machine tail flue 19 according to the existing flue gas test chart of the sintering machine bellows (for example, for the sintering machine with 23 air bellows flues, No. 1 to No. 3 are the machine head flues 23, No. 4 to No. 8 are the front section flues 2, No. 9 to No. 19 are the middle section flues 4, and No. 20 to No. 23 are the machine tail flues 19). Wherein, the front section flue 2 discharges flue gas with high concentration of carbon monoxide and nitrogen oxide; the middle flue 4 discharges high-concentration sulfur dioxide flue gas. The smoke discharged by the machine head flue 23 is treated by the second dust remover 18 and then discharged by the chimney 15, the second dust remover 18 is an electric dust remover and can remove dust in the smoke, the machine tail flue 19 leads the smoke out of the air box and then merges the smoke into the machine head flue 23, and the smoke is discharged into the chimney 15 after being removed by the second dust remover 18, so that the pipeline cost and the configuration number of the dust removers can be saved. High-concentration sulfur dioxide flue gas discharged by a middle-section flue 4 sequentially passes through a desulfurization reaction device 21 and a first dust remover 9 and then enters a flue gas sealing cover 3, the flue gas is uniformly distributed to the middle and rear section material surface of a sintering machine trolley to participate in flue gas circulation through the uniform distribution effect of the flue gas sealing cover 3, the desulfurization reaction device 21 can remove sulfur dioxide in the flue gas, and the first dust remover 9 is a bag-type dust remover and can remove dust (99.5% of large and small particles) in the flue gas, so that the treatment of the flue gas can be transferred to the flue gas circulation process; the high-concentration carbon monoxide and high-concentration nitrogen oxide flue gas discharged by the front section flue 2 sequentially passes through the first ammonia injection system 11 and the SCR reactor 13 and then enters the middle section flue 4, the flue gas is dedusted by the first deduster 9 in the middle section flue 4 and then enters the flue gas sealing cover 3 to participate in flue gas circulation, and the first ammonia injection system 11 and the SCR reactor 13 are matched to remove nitrogen oxide in the flue gas, so that the flue gas treatment can be transferred to the flue gas circulation process. The invention transfers the tail end treatment of the flue gas to the circulation process of the sintering flue gas, compared with the combination of the common sintering flue gas circulation technology and the subsequent flue gas purification system, the invention can greatly reduce the scale of the desulfurization reaction device 21 and the SCR reactor 13, further save the cost of the desulfurizer matched with the desulfurization reaction device 21 and the cost of the denitration catalyst matched with the SCR reactor 13, thereby saving the investment cost and the operation cost during the flue gas treatment. In addition, the smoke gas of the front section flue 2 and the middle section flue 4 with large smoke discharge amount participates in smoke gas circulation, and the air supplement device 8 is arranged at the inlet of the smoke gas sealing cover 3 (on the middle section flue 4) to supplement oxygen, so that the smoke gas circulation proportion can be improved, and the problem of small smoke gas circulation proportion is solved.
As an improvement of the present invention, as shown in fig. 1 and fig. 2, the present invention further provides the following modifications:
in order to reduce the operation cost, as shown in fig. 1, a gas-gas heat exchanger 20 is further mounted on the front section flue 2, and the gas-gas heat exchanger 20 is positioned between the air box and the first ammonia injection device and is connected with the tail flue 19, so that the flue gas in the front section flue 2 participating in flue gas circulation can be heated by using the flue gas waste heat in the tail flue 19, the flue gas in the front section flue 2 is heated to more than 200 ℃ and then participates in flue gas circulation, the heat utilization rate of the invention is further improved, and the operation cost is reduced.
In the operation process of the present invention, the temperature of the sinter bed of the sintering machine main body 1 is 1000 to 1100 ℃, and the temperature range of the SNCR denitration reaction is 900 to 1100 ℃. In order to further reduce the operation cost and improve the denitration effect of the invention, as shown in fig. 1, a second ammonia injection system 5 is further installed on the middle flue 4 of the invention, and the second ammonia injection system 5 is positioned between the gas supplementing device 8 and the flue gas sealing cover 3 and can inject ammonia gas into the middle flue 4, so that the nitrogen oxide and the ammonia gas in the circulating flue gas can generate SNCR denitration reaction under the heat provided by the sinter bed to further remove the nitrogen oxide. The invention utilizes the temperature of the sinter bed of the sintering machine main body 1 to carry out SNCR denitration reaction, can further save denitration cost, and adopts the organic combination of SCR and SNCR denitration, and can further improve the denitration effect of the invention.
In order to further improve the flue gas circulation ratio of the invention, as shown in fig. 1, the gas supplementing device 8 of the invention comprises an oxygen buffer tank 7 and an oxygen distributor 6, wherein the oxygen buffer tank 7 can store pure oxygen, and the oxygen distributor can distribute oxygen to the middle flue 4. The invention distributes pure oxygen (oxygen concentration is 100%) into the middle flue 4 by the oxygen distributor 6, which can solve the oxygen supply problem in flue gas circulation and further improve the flue gas circulation proportion of the invention, thereby improving the flue gas circulation proportion of the invention to more than 65%.
In order to improve the operation efficiency of the invention and reduce the smoke leakage, as shown in fig. 1, the middle flue 4 of the invention is also provided with a first fan 14, and the first fan 14 is positioned between the first dust remover 9 and the air supplement device 8, and can extract the smoke in the front section flue 2 and the middle section flue 4 and accelerate the smoke circulation; the second fan 17 is further installed on the machine head flue 23, and the second fan 17 is located between the second dust remover 18 and the chimney 15 and can extract smoke in the machine head flue 23, so that smoke emission is accelerated. The first fan 14 and the second fan 17 are matched, so that the operation efficiency of the invention can be accelerated, and the invention can maintain the air pressure in the smoke sealing cover 3 in a micro negative pressure state (0 Pa to 200Pa lower than the standard atmospheric pressure) by extracting smoke in the wind box through the first fan 14 and the second fan 17, thereby reducing smoke leakage.
In order to keep the operation stable and reduce the fluctuation in the flue gas sealing cover 3, as shown in fig. 1 and fig. 2, the flue gas sealing cover 3 of the present invention is provided with a pressure detection device 24, an oxygen concentration detection device 25 and an air inlet branch pipe 27; air inlet branch 27 is used for communicateing flue gas sealed cowling 3 and middle section flue 4, is equipped with governing valve 26 on air inlet branch 27, thereby governing valve 26 can adjust the air input of aperture regulation flue gas sealed cowling 3, is convenient for adjust according to sintering bed different zone gas permeability and need tolerance difference, and pressure measurement 24 can detect the atmospheric pressure in the flue gas sealed cowling 3, and oxygen concentration detection device 25 can detect the oxygen concentration in the flue gas sealed cowling 3. The invention can reduce the air pressure fluctuation in the flue gas sealing cover 3 through detection and adjustment, thereby keeping stable operation. Further, in the present invention, the number of the intake branch pipes 27, the number of the pressure detection devices 24, and the number of the oxygen concentration detection devices 25 are multiple (preferably four), and the plurality of intake branch pipes 27, the plurality of pressure detection devices 24, and the plurality of oxygen concentration detection devices 25 are in one-to-one correspondence, so that the circulation amount of the flue gas at each position in the flue gas sealing cover 3 can be detected and adjusted, and the stable operation of the present invention is further ensured.
In order to fully monitor the operation state of the present invention, as shown in fig. 1 and fig. 2, in the present invention, a CEMS analyzer 16(CEMS is an abbreviation of Continuous Emission Monitoring System) is further installed on the machine head flue 23, and the CEMS analyzer 16 is located between the second fan 17 and the chimney 15, and can perform real-time online Monitoring on the outside exhaust gas; a nitrogen oxide concentration analyzer 12 is further installed on the front section flue 2, and the nitrogen oxide concentration analyzer 12 is located between the first ammonia injection system 11 and the SCR reactor 13 and can monitor the concentration of nitrogen oxides in flue gas; a first sulfur dioxide concentration analyzer 22 and a second sulfur dioxide concentration analyzer 10 are also arranged on the middle flue 4; first sulfur dioxide concentration analyzer 22 is located between bellows and desulfurization reaction unit 21, can monitor the sulfur dioxide concentration of middle section flue 4 and the interior flue gas of bellows, and second sulfur dioxide concentration analyzer 10 is located between first fan 14 and the air supplement unit 8, can monitor the concentration of sulfur dioxide in the flue gas of participating in the flue gas circulation.
As shown in fig. 1 and fig. 2, the present invention further provides a method for recycling and purifying flue gas of a sintering machine and utilizing waste heat, which is implemented based on a system for recycling and purifying flue gas of a sintering machine and utilizing waste heat, and comprises: covering a flue gas sealing cover 3 on the sintering machine main body 1, and leading out flue gas of an air box at the bottom of the sintering machine main body 1 from a machine head flue 23, a front section flue 2, a middle section flue 4 and a machine tail flue 19 respectively; connecting the middle flue 4 with the flue gas sealing cover 3, and arranging a desulfurization reaction device 21 and a first dust remover 9 on the middle flue 4 to treat the flue gas; the front section flue 2 is merged into the middle section flue 4, and a first ammonia injection device and an SCR reactor 13 are arranged on the front section flue 2 to treat the flue gas; connecting a machine head flue 23 with a chimney 15, and arranging a second dust remover 18 on the machine head flue 23 to treat the flue gas; the tail flue 19 is merged into the head flue 23.
The flue gas circulation purification and waste heat utilization method for the sintering machine, disclosed by the invention, has the advantages that the flue gas treatment is carried out in the flue gas circulation process, the flue gas treatment cost can be reduced, the flue gas in the front section flue 2 and the middle section flue 4 with large smoke discharge amount is treated and then introduced into the flue gas sealing cover 3 for flue gas circulation, the flue gas circulation ratio can be improved, and therefore, the flue gas circulation purification and waste heat utilization method has the characteristics of high flue gas circulation ratio and low flue gas treatment cost.
Further, as shown in fig. 1, in the method for circulating and purifying flue gas of a sintering machine and utilizing residual heat of the sintering machine of the present invention, the gas-gas heat exchanger 20 is arranged on the front section flue 2, and the machine tail flue 19 is connected to the gas-gas heat exchanger 20, so that the residual heat of the flue gas in the machine tail flue 19 can be utilized to supply heat to the flue gas participating in flue gas circulation in the front section flue 2, and the residual heat of the flue gas is fully utilized to improve the heat energy of the circulating flue gas.
Further, as shown in fig. 1, in the method for circulation purification of flue gas and utilization of waste heat of a sintering machine of the present invention, the gas supply device 8 is disposed on the middle flue 4 to supply pure oxygen to the middle flue 4, so that the flue gas circulation ratio can be further improved, the second ammonia injection system 5 is disposed on the middle flue 4 to inject ammonia into the middle flue 4, so that nitrogen oxides can be removed by using the temperature of the sinter bed of the sintering machine main body 1, the cost is saved, and the removal effect of nitrogen oxides is improved.
Further, as shown in fig. 1, in the method for circulating and purifying flue gas of a sintering machine and utilizing waste heat of the sintering machine, the first fan 14 is arranged on the middle section flue 4, the second fan 17 is arranged on the head flue 23, and the first fan 14 and the second fan 17 are used for maintaining the interior of the flue gas sealing cover 3 in a micro negative pressure state (the air pressure is 0Pa to 200Pa less than the standard atmospheric pressure), so that the leakage of the flue gas in the flue gas sealing cover 3 can be reduced, and the operation efficiency of the method is improved.
In conclusion, the sintering machine flue gas circulation purification and waste heat utilization system and method provided by the invention transfer the tail end treatment of flue gas to the circulation process of sintering flue gas, can enrich and internally remove pollutants in the flue gas, combine the sintering flue gas process control with the tail end treatment, and comprehensively treat the flue gas, so that the investment cost and the operation cost in flue gas treatment can be saved, and a desulfurization and denitrification purification device is not required to be arranged on an external exhaust flue (a machine head flue 23). In addition, pure oxygen is adopted for oxygen supplementation, and smoke with large smoke quantity in the front section flue 2 and the middle section flue 4 is set for smoke circulation, so that the smoke circulation ratio can be greatly improved to be more than 65%. In addition, the SCR and SNCR denitration are organically combined, and the sintering material layer of the sintering machine main body 1 is utilized to provide a heat source for the SNCR denitration reaction, so that the heat source is saved, and the denitration effect can be improved.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (10)
1. The utility model provides a sintering machine flue gas circulation purifies and waste heat utilization system which characterized in that includes:
the device comprises a sintering machine main body, a smoke sealing cover covering the material surface of the sintering machine main body, an air box installed at the bottom of the sintering machine main body and a flue connected with the air box;
the flue comprises a machine head flue, a front section flue, a middle section flue and a machine tail flue;
one end of the middle-section flue is connected with the air box, and the other end of the middle-section flue is connected with the flue gas sealing cover; a desulfurization reaction device, a first dust remover and an air supply device are sequentially arranged on the middle section flue along the direction from the air box to the flue gas sealing cover;
one end of the front section flue is connected with the air box, the other end of the front section flue is connected with the middle section flue, and a connection point is positioned between the desulfurization reaction device and the first dust remover; a first ammonia injection system and an SCR reactor are sequentially arranged on the front section flue and along the direction from the air box to the middle section flue;
one end of the machine head flue is connected with the air box, the other end of the machine head flue is connected with the chimney, and a second dust remover is arranged on the machine head flue;
and one end of the tail flue is connected with the air box, the other end of the tail flue is connected with the head flue, and the connecting point is positioned between the air box and the second dust remover.
2. The flue gas circulation purification and waste heat utilization system for the sintering machine according to claim 1, characterized in that:
the front section flue is also provided with a gas-gas heat exchanger, the gas-gas heat exchanger is positioned between the air box and the first ammonia injection device, and the gas-gas heat exchanger is connected with the tail flue;
preferably, a nitrogen oxide concentration analyzer is further installed on the front flue, and the nitrogen oxide concentration analyzer is located between the first ammonia injection system and the SCR reactor.
3. The flue gas circulation purification and waste heat utilization system for the sintering machine according to claim 1, characterized in that:
and a second ammonia injection system is further installed on the middle section flue, and the second ammonia injection system is positioned between the gas supplementing device and the flue gas sealing cover.
4. The flue gas circulation purification and waste heat utilization system for the sintering machine according to claim 1, characterized in that:
the air supplement unit comprises an oxygen buffer tank and an oxygen uniform distributor, the oxygen buffer tank is used for storing pure oxygen, and the oxygen distributor is used for distributing oxygen to the middle flue.
5. The flue gas circulation purification and waste heat utilization system for the sintering machine according to claim 1, characterized in that:
the middle section flue is also provided with a first fan, and the first fan is positioned between the first dust remover and the air supply device;
and a second fan is also installed on the machine head flue and is positioned between the second dust remover and the chimney.
6. The flue gas circulation purification and waste heat utilization system for the sintering machine according to claim 5, characterized in that:
a first sulfur dioxide concentration analyzer and a second sulfur dioxide concentration analyzer are also arranged on the middle section flue; the first sulfur dioxide concentration analyzer is located between the air box and the desulfurization reaction device, and the second sulfur dioxide concentration analyzer is located between the first fan and the air supply device.
7. The flue gas circulation purification and waste heat utilization system for the sintering machine according to claim 1, characterized in that:
the smoke sealing cover is provided with a pressure detection device, an oxygen concentration detection device and an air inlet branch pipe; the gas inlet branch pipe is used for communicating the flue gas sealing cover and the middle section flue, and an adjusting valve is arranged on the gas inlet branch pipe;
preferably, the number of the intake manifold, the number of the pressure detection devices, and the number of the oxygen concentration detection devices are plural, and the plurality of the intake manifolds, the plurality of the pressure detection devices, and the plurality of the oxygen concentration detection devices correspond to one another.
8. A sintering machine flue gas circulation purification and waste heat utilization method is realized based on a sintering machine flue gas circulation purification and waste heat utilization system, and is characterized in that:
covering a flue gas sealing cover on the sintering machine main body, and leading out flue gas of an air box at the bottom of the sintering machine main body from a machine head flue, a front section flue, a middle section flue and a machine tail flue respectively;
connecting the middle section flue with the flue gas sealing cover, and arranging a desulfurization reaction device and a first dust remover on the middle section flue to treat the flue gas;
merging the front section flue into the middle section flue, and arranging a first ammonia injection device and an SCR reactor on the front section flue to treat flue gas;
connecting the machine head flue with a chimney, and arranging a second dust remover on the machine head flue to treat the flue gas;
and merging the machine tail flue into the machine head flue.
9. The sintering machine flue gas circulation purification and waste heat utilization method according to claim 8, characterized in that:
and a gas-gas heat exchanger is arranged on the front section flue, the machine tail flue is connected into the gas-gas heat exchanger, and the machine tail flue is used for supplying heat to the front section flue.
10. The sintering machine flue gas circulation purification and waste heat utilization method according to claim 8, characterized in that:
and arranging an air supplementing device on the middle section flue to provide pure oxygen for the middle section flue, arranging a second ammonia injection system to inject ammonia into the middle section flue, and removing nitrogen oxides by using the temperature of a sinter bed of the sintering machine main body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911296747.5A CN110953894A (en) | 2019-12-16 | 2019-12-16 | Sintering machine flue gas circulation purification and waste heat utilization system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911296747.5A CN110953894A (en) | 2019-12-16 | 2019-12-16 | Sintering machine flue gas circulation purification and waste heat utilization system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110953894A true CN110953894A (en) | 2020-04-03 |
Family
ID=69982072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911296747.5A Pending CN110953894A (en) | 2019-12-16 | 2019-12-16 | Sintering machine flue gas circulation purification and waste heat utilization system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110953894A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113390269A (en) * | 2021-05-25 | 2021-09-14 | 鞍钢股份有限公司 | Sintering machine flue gas recycling system and method |
| CN114353061A (en) * | 2021-12-31 | 2022-04-15 | 北京博奇电力科技有限公司 | Sintering flue gas ultralow emission system and method based on circulating fluidized bed desulfurization |
| CN117249691A (en) * | 2023-09-15 | 2023-12-19 | 河北富莱尔环保节能工程有限公司 | Sintering flue gas circulating purification emission reduction process and system |
Citations (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101376921A (en) * | 2008-10-10 | 2009-03-04 | 中南大学 | Sintering gas flue gas sulfuric dioxide decrement discharge technology |
| CN102936651A (en) * | 2012-10-23 | 2013-02-20 | 鞍钢股份有限公司 | Simultaneous sintering and desulphurization and denitration system, and desulphurization and denitration method |
| CN103157356A (en) * | 2011-12-14 | 2013-06-19 | 鞍钢股份有限公司 | Sintering denitrification system and nitrogen oxide removal method thereof |
| CN103463946A (en) * | 2013-09-30 | 2013-12-25 | 武汉钢铁(集团)公司 | Sintering flue gas purifying method based on thermal agglomerate catalytic action |
| CN103499216A (en) * | 2013-09-26 | 2014-01-08 | 中南大学 | Iron mine sintering flue gas segmented circulation method |
| CN103900391A (en) * | 2014-04-14 | 2014-07-02 | 北京京诚泽宇能源环保工程技术有限公司 | Selective sintering-machine flue-gas heat exchange and denitration system and method thereof |
| CN104132550A (en) * | 2014-07-01 | 2014-11-05 | 中国科学院过程工程研究所 | Energy-saving environment-friendly sintering waste gas waste-heat utilization and pollutant purification process and system |
| CN203928777U (en) * | 2014-07-18 | 2014-11-05 | 温广胜 | Flue gas circulation denitration system of sintering machine |
| CN104195326A (en) * | 2014-08-19 | 2014-12-10 | 浙江大学 | Sintering energy-saving technique and system capable of removing multiple pollutants |
| CN104513897A (en) * | 2014-12-19 | 2015-04-15 | 中南大学 | Iron ore sintering method with ultrahigh-proportion flue gas circulation |
| CN104748566A (en) * | 2015-03-27 | 2015-07-01 | 钢铁研究总院 | Method for iron mine sintering energy conservation and emission reduction |
| CN105091615A (en) * | 2015-08-06 | 2015-11-25 | 中南大学 | Comprehensive treatment method for iron ore sintering smoke pollutants |
| CN105135895A (en) * | 2015-08-03 | 2015-12-09 | 郑琨 | Selective sintering flue gas sectional type comprehensive treatment technology |
| CN105509491A (en) * | 2015-12-09 | 2016-04-20 | 郑琨 | Environmental-protection and energy-conservation treatment technology of sintering flue gas |
| CN107930396A (en) * | 2017-11-28 | 2018-04-20 | 中南大学 | A kind of method for sintering fume centralized high-efficiency desulfurization denitration |
| CN107983154A (en) * | 2017-11-28 | 2018-05-04 | 中南大学 | One kind sintering parallel double tower desulfurizing and denitrifying process of flue gas activated carbon |
| CN110420558A (en) * | 2019-08-27 | 2019-11-08 | 东方电气集团东方锅炉股份有限公司 | A kind of denitrating system for grate-kiln pelletizing equipment |
| CN110523251A (en) * | 2019-09-24 | 2019-12-03 | 北京中航泰达环保科技股份有限公司 | A kind of system for desulfuration and denitration and method of sintering flue gas circulation joint ozone pre-oxidation |
| CN110538560A (en) * | 2019-09-24 | 2019-12-06 | 北京中航泰达环保科技股份有限公司 | System and method for circularly combining desulfurization and ozone preoxidation denitration by using sintering flue gas |
| CN211575905U (en) * | 2019-12-16 | 2020-09-25 | 北京中航泰达环保科技股份有限公司 | Flue gas circulation purification and waste heat utilization system of sintering machine |
-
2019
- 2019-12-16 CN CN201911296747.5A patent/CN110953894A/en active Pending
Patent Citations (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101376921A (en) * | 2008-10-10 | 2009-03-04 | 中南大学 | Sintering gas flue gas sulfuric dioxide decrement discharge technology |
| CN103157356A (en) * | 2011-12-14 | 2013-06-19 | 鞍钢股份有限公司 | Sintering denitrification system and nitrogen oxide removal method thereof |
| CN102936651A (en) * | 2012-10-23 | 2013-02-20 | 鞍钢股份有限公司 | Simultaneous sintering and desulphurization and denitration system, and desulphurization and denitration method |
| CN103499216A (en) * | 2013-09-26 | 2014-01-08 | 中南大学 | Iron mine sintering flue gas segmented circulation method |
| CN103463946A (en) * | 2013-09-30 | 2013-12-25 | 武汉钢铁(集团)公司 | Sintering flue gas purifying method based on thermal agglomerate catalytic action |
| CN103900391A (en) * | 2014-04-14 | 2014-07-02 | 北京京诚泽宇能源环保工程技术有限公司 | Selective sintering-machine flue-gas heat exchange and denitration system and method thereof |
| CN104132550A (en) * | 2014-07-01 | 2014-11-05 | 中国科学院过程工程研究所 | Energy-saving environment-friendly sintering waste gas waste-heat utilization and pollutant purification process and system |
| CN203928777U (en) * | 2014-07-18 | 2014-11-05 | 温广胜 | Flue gas circulation denitration system of sintering machine |
| CN104195326A (en) * | 2014-08-19 | 2014-12-10 | 浙江大学 | Sintering energy-saving technique and system capable of removing multiple pollutants |
| CN104513897A (en) * | 2014-12-19 | 2015-04-15 | 中南大学 | Iron ore sintering method with ultrahigh-proportion flue gas circulation |
| CN104748566A (en) * | 2015-03-27 | 2015-07-01 | 钢铁研究总院 | Method for iron mine sintering energy conservation and emission reduction |
| CN105135895A (en) * | 2015-08-03 | 2015-12-09 | 郑琨 | Selective sintering flue gas sectional type comprehensive treatment technology |
| CN105091615A (en) * | 2015-08-06 | 2015-11-25 | 中南大学 | Comprehensive treatment method for iron ore sintering smoke pollutants |
| CN105509491A (en) * | 2015-12-09 | 2016-04-20 | 郑琨 | Environmental-protection and energy-conservation treatment technology of sintering flue gas |
| CN107930396A (en) * | 2017-11-28 | 2018-04-20 | 中南大学 | A kind of method for sintering fume centralized high-efficiency desulfurization denitration |
| CN107983154A (en) * | 2017-11-28 | 2018-05-04 | 中南大学 | One kind sintering parallel double tower desulfurizing and denitrifying process of flue gas activated carbon |
| CN110420558A (en) * | 2019-08-27 | 2019-11-08 | 东方电气集团东方锅炉股份有限公司 | A kind of denitrating system for grate-kiln pelletizing equipment |
| CN110523251A (en) * | 2019-09-24 | 2019-12-03 | 北京中航泰达环保科技股份有限公司 | A kind of system for desulfuration and denitration and method of sintering flue gas circulation joint ozone pre-oxidation |
| CN110538560A (en) * | 2019-09-24 | 2019-12-06 | 北京中航泰达环保科技股份有限公司 | System and method for circularly combining desulfurization and ozone preoxidation denitration by using sintering flue gas |
| CN211575905U (en) * | 2019-12-16 | 2020-09-25 | 北京中航泰达环保科技股份有限公司 | Flue gas circulation purification and waste heat utilization system of sintering machine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113390269A (en) * | 2021-05-25 | 2021-09-14 | 鞍钢股份有限公司 | Sintering machine flue gas recycling system and method |
| CN114353061A (en) * | 2021-12-31 | 2022-04-15 | 北京博奇电力科技有限公司 | Sintering flue gas ultralow emission system and method based on circulating fluidized bed desulfurization |
| CN117249691A (en) * | 2023-09-15 | 2023-12-19 | 河北富莱尔环保节能工程有限公司 | Sintering flue gas circulating purification emission reduction process and system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110953894A (en) | Sintering machine flue gas circulation purification and waste heat utilization system and method | |
| CN211575905U (en) | Flue gas circulation purification and waste heat utilization system of sintering machine | |
| CN105698550A (en) | Sintering flue gas purification system and method achieving energy conservation and emission reduction | |
| CN102580455A (en) | Sintering smoke treatment system and sintering smoke treatment method | |
| CN102936651A (en) | Simultaneous sintering and desulphurization and denitration system, and desulphurization and denitration method | |
| CN107469561A (en) | A kind of gas cleaning absorption tower and its processing method | |
| CN107115775B (en) | Iron ore sintering flue gas sectional enrichment self-heat exchange emission reduction SOxAnd NOxMethod of producing a composite material | |
| CN113390269B (en) | Sintering machine flue gas recycling system and method | |
| CN211659714U (en) | Combined flue gas circulation, grading purification and waste heat utilization device for multiple sintering machines | |
| CN110523251A (en) | A kind of system for desulfuration and denitration and method of sintering flue gas circulation joint ozone pre-oxidation | |
| CN214319745U (en) | Device for treating CO and nitrogen oxide at tail end of flue gas of sintering machine | |
| CN111121472A (en) | Sintering machine flue gas internal and external combined cycle purification and waste heat utilization system | |
| CN208177248U (en) | It is a kind of based on active carbon/coke coke oven flue gas system for desulfuration and denitration | |
| CN110484283A (en) | A kind of coking residual heat integrative recovery process and system | |
| CN104548900A (en) | Process device of coke oven fume denitrification, desulfuration and reheating system | |
| CN204365119U (en) | A kind of coke oven flue gas denitration desulfurization and reheat system process unit | |
| CN205448732U (en) | Energy saving and emission reduction's sintering gas cleaning system | |
| CN204522707U (en) | Electron beam flue gas processing device | |
| CN208583169U (en) | A kind of sintering flue gas desulfurization denitration, flue gas disappear white total system | |
| CN208583143U (en) | Afterheat utilizing system | |
| CN206778183U (en) | A kind of denitrating system for directly utilizing sintering deposit heat | |
| CN209865734U (en) | Sintering flue gas circulation is united ozone preoxidation's SOx/NOx control system | |
| CN210833105U (en) | Sintering machine exhaust gas recycling system | |
| CN112403181B (en) | Flue gas desulfurization and denitrification treatment system and method | |
| CN209828684U (en) | System for circularly combining desulfurization and ozone preoxidation denitration by using sintering flue gas |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |