CN108120297B - Gas injection device and gas injection method - Google Patents
Gas injection device and gas injection method Download PDFInfo
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- CN108120297B CN108120297B CN201710512407.6A CN201710512407A CN108120297B CN 108120297 B CN108120297 B CN 108120297B CN 201710512407 A CN201710512407 A CN 201710512407A CN 108120297 B CN108120297 B CN 108120297B
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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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
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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
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Abstract
The application provides a gas injection device and a gas injection method. The blowing branch pipe is provided with a branch pipe flow monitoring device and a branch pipe flow control device; the inner side wall of the sintering machine trolley is provided with a temperature measuring element. The gas injection method comprises the following steps: drawing a material layer heat storage curve of the sintering machine through the material layer temperature measured by the temperature measuring element above each bellows; drawing a heat compensation value curve required by normal production of the material layer of the sintering machine, and calculating the gas quantity required to be sprayed by the material layer at each bellows position; according to the gas quantity required to be blown by the material layer at the position of each bellows, calculating the gas quantity required to be blown by each blowing tube row; the gas flow in each injection branch pipe is controlled by a branch pipe flow control device of each injection branch pipe. The application has simple structure, saves energy, reduces cost and has better auxiliary sintering effect.
Description
Technical Field
The application relates to a gas injection device and a gas injection method, in particular to a sintering machine gas injection method and a gas injection device capable of carrying out step gas distribution, and belongs to the field of sintering.
Background
The sintering process is one key link in iron making process, and is characterized by that various powdered iron-containing raw materials are mixed with proper fuel and flux, added with proper quantity of water, and after mixing and pelletizing, the materials are undergone a series of physical-chemical change on sintering equipment, and sintered into blocks, so that they are fed into blast furnace to implement next process.
In order to reduce the coke ratio and smelting cost of blast furnace ironmaking, the requirements of blast furnace on sinter are often high strength and high reducibility. In the sintering process, sintered ore is generally required to have high strength, high yield, low return rate, and low fuel consumption. The high-strength and high-reducibility sintered ore consumes less coke in the blast furnace smelting process, thereby reducing the emission of carbon dioxide. In the long term, carbon dioxide emission reduction requirement becomes one of the bottlenecks restricting the development of the steel industry. According to the related data, the carbon dioxide emission of the sintering and blast furnace process accounts for about 60% of the total industrial emission. Therefore, reduction of the sintered solid fuel consumption ratio and reduction of the fuel ratio of the blast furnace burden are urgent needs of iron-making technology, both from the viewpoint of cost reduction of enterprises and from the viewpoint of environmental protection.
In this large environment, "technology for injecting gas fuel on the surface of a sinter bed" developed by JFE corporation, in japan, has been developed, and according to fig. 1, the principle is that a gas fuel diluted below the lower limit of the combustible concentration is injected above a sintering pallet exemplified by the rear end of an ignition furnace by an injection device, and is burned and heated in a sinter bed. The technology can reduce the solid carbon consumption and the carbon dioxide emission in the sinter production, and simultaneously, the burning of the gas fuel widens the high-temperature zone width of the sinter layer in the production, so that the sinter temperature time of 1200-1400 ℃ is prolonged, and the strength and the 5-10 mm porosity of the sinter are effectively enhanced. At present, the technology has good energy-saving, emission-reducing and quality-improving effects, and has good market development potential in the future.
The blowing device in the prior art consists of a blowing main pipe, a blowing branch pipe, a blowing pipe row and a blowing cover. Wherein one end of the jetting main pipe is connected with the gas pipeline in the factory, and the other end is connected with the jetting branch pipe. The blowing branch pipe is connected with a blowing pipe row which is positioned in the blowing cover and above the sintering machine trolley. The gas enters the main injection pipe from the gas pipeline in the factory, then uniformly enters each injection branch pipe, finally is ejected from the injection pipe row, is mixed with air in the injection cover to form mixed gas with the concentration required by design, and enters the sintering material layer to assist sintering.
However, in the production of the sintering machine, the combustion zone is gradually moved from top to bottom while being burned in the cross-sectional direction. The lower material layer is influenced by the continuous hot air heat accumulation of the upper combustion zone when the sintering time is more backward, so that the energy required for achieving the sintering effect is lower. In the prior art, the injection device adopts an average gas supply method, namely, each section of injection tube row injects equal-component fuel gas, so that a large amount of energy is wasted, and the energy consumption index is high. Secondly, because too much fuel gas is blown, the material at the lower part of the sinter bed absorbs too much energy, the temperature is too high to generate a fusion layer, the quality of the sinter finished product is negatively affected, and the overall auxiliary effect of the fuel gas blowing auxiliary sintering process is poor.
Disclosure of Invention
In order to overcome the defects in the prior art, the stretching research and analysis of the prior art is carried out, so that the purpose of ensuring stable and smooth production of the whole production line is achieved by accurately calculating the amount of gas to be blown to the section of the tube row according to the position of the bellows of the blowing tube row on the sintering machine. According to the gas blowing device, namely the gas blowing method, the gas amount required to be blown by each blowing pipe row is calculated according to the material layer temperature above the bellows covered by the lower part of each blowing pipe row, the gas amount blown by each section of blowing pipe row can be accurately controlled, stepped gas distribution is carried out, energy conservation, emission reduction and quality improvement are realized, and better auxiliary sintering production is realized.
According to a first embodiment of the present application, a gas injection device is provided.
The gas jetting device comprises a sintering machine trolley, a jetting cover (or a sealing cover), a jetting device and a bellows; the sintering machine trolley is arranged in the blowing cover, and the bellows is arranged below the sintering machine trolley; the blowing device comprises a blowing main pipe, a blowing branch pipe and a blowing pipe row; the main injection pipe is arranged at the outer side of the injection cover, the injection pipe row is arranged in the injection cover and positioned above the sintering machine trolley, one end of the injection branch pipe is connected with the main injection pipe, the other end of the injection branch pipe extends into the injection cover and is connected with the injection pipe row, the injection pipe row comprises a plurality of injection pipes, and injection holes are formed in the injection pipes; wherein, the main injection pipe is connected with 2 or more than 2 injection branch pipes, each injection branch pipe is connected with an injection pipe row, and the injection branch pipes are provided with a branch pipe flow monitoring device and a branch pipe flow control device; the inner side wall of the sintering machine trolley is provided with a temperature measuring element.
Preferably, a main pipe flow monitoring device is arranged on the jetting main pipe; preferably, the main pipe flow control device is provided on the main blowing pipe.
Preferably, the manifold flow monitoring device 501 is disposed at the upstream end of the manifold flow control device 601.
In the present application, the gas injection device comprises 12 to 45 windboxes, preferably 16 to 42 windboxes, preferably 20 to 40 windboxes, more preferably 24 to 35 windboxes; preferably, an array of temperature measuring elements is arranged on the inner side wall of the sintering pallet above each air box, and the direction of the array of temperature measuring elements is perpendicular to the bottom of the sintering pallet 1.
In the application, the main injection pipe is connected with n injection branch pipes, wherein: n is 2 to 10, preferably 3 to 8, more preferably 4 to 6.
In the present application, the lower part of each blowing tube row is covered with 1 to 8 windboxes, preferably 2 to 5 windboxes; preferably, the number of windboxes covered by the lower portion of each blowing tube row is the same.
In the application, 1-10 temperature measuring elements, preferably 2-8 temperature measuring elements, more preferably 2-6 temperature measuring elements are arranged on the inner side wall of the sintering machine trolley above each air box.
In the present application, each lance tube row comprises 2 to 50 lance tubes, preferably 3 to 40 lance tubes, more preferably 5 to 20 lance tubes; 2-100 blowing holes, preferably 3-50 blowing holes, are formed in each blowing pipe; preferably, the opening direction of the blowing holes is directed toward the sintering pallet.
Preferably, the blowing pipe is a blowing sleeve with 2 or more (for example, 3) sections, the blowing sleeve adopts a telescopic sleeve structure, and preferably, each section of the blowing sleeve is provided with a blowing hole.
Preferably, the blowing device further comprises a control system. The control system is connected with the branch pipe flow monitoring device, the branch pipe flow control device, the main pipe flow monitoring device, the main pipe flow control device and the temperature measuring element and controls the branch pipe flow control device and the main pipe flow control device.
According to a second embodiment of the present application, there is provided a gas injection method or a method using the above-described apparatus.
A gas injection method comprising the steps of:
1) Measuring the material layer temperature of the corresponding air box position through a temperature measuring element on the inner side wall of the sintering machine trolley above each air box, and drawing a material layer heat storage curve of each air box position of the sintering machine;
2) Drawing a heat compensation value curve required by normal production of the material layer at each air box position of the sintering machine according to the material layer heat storage curve at each air box position of the sintering machine, and calculating the gas quantity required by blowing of the material layer at each air box position;
3) According to the gas quantity required to be blown by the material layer at the position of each bellows, the gas quantity Q required to be blown by each blowing pipe row is calculated n Wherein: n is 2 to 10, preferably 3 to 8, more preferably 4 to 6;
4) The system starts to run and starts to blow fuel gas;
5) The control system controls the gas flow Q in each injection branch pipe through the branch pipe flow control device of each injection branch pipe n ；
6) The fuel gas is evenly sprayed to the surface of the mineral aggregate from the spraying holes, and enters the mineral aggregate for sintering.
In the application, according to the quantity Q of the fuel gas required to be blown by each blowing pipe row n Calculating the total quantity Q of gas injection in the main injection pipe, wherein Q=Q 1 +Q 2 +……+Q n The method comprises the steps of carrying out a first treatment on the surface of the The control system controls the flow of the fuel gas in the jetting main pipe through the main pipe flow control device.
In the present application, the control system calculates Q based on the calculated 1 、Q 2 、……Q n The flow rate of the gas in the first jetting branch pipe is controlled to be Q by a branch pipe flow control device on the first jetting branch pipe 1 The method comprises the steps of carrying out a first treatment on the surface of the Controlling the gas flow in the second spraying branch pipe to be Q through a branch pipe flow control device on the second spraying branch pipe 2 The method comprises the steps of carrying out a first treatment on the surface of the … … the gas flow in the last injection branch pipe is controlled to be Q by the branch pipe flow control device on the last injection branch pipe n 。
Preferably, the method further comprises step 7):
the gas injection amount of each injection branch pipe 302 and the injection header 301 is detected in real time:
when the gas injection quantity of each injection branch pipe 302 and each injection main pipe 301 is unchanged, the operation is continued;
when the gas injection amounts of the respective injection branch pipes 302 and injection header 301 change, the process returns to step 5).
In the above method, the amount of fuel gas to be blown by the material layer at each windbox position is positively correlated with the supplementary heat value required for the normal production of the material layer at the windbox position.
In the method, the amount of gas to be blown by each blowing tube row is equal to the amount of gas to be blown by the material layer at the position of the bellows covered at the lower part of the blowing tube row. For example, the lower part of the blowing pipe row covers 4 bellows, so that the amount of fuel gas required to be blown by the blowing pipe row is equal to the sum of the amounts of fuel gas required to be blown by the material layers at the 4 bellows positions covered by the lower part of the blowing pipe row.
When the sintering machine is produced, the combustion belt burns and slowly moves from top to bottom, so that the lower material layer is affected by the upper combustion belt to continuously store hot air, and the more the sintering time is over, the higher the heat storage value of the material layer is, and the lower the heat compensation value required for achieving the sintering effect is correspondingly. The heat compensation values required by the sintering machine material layers above the bellows at different positions are in a step reduction trend along the running direction of the sintering machine trolley, the heat compensation values required by the sintering material layers above the bellows covered by the lower parts of the jetting pipe rows are positively correlated with the jetting gas quantities required by the jetting pipe rows, and accordingly, the jetting gas quantities required by the jetting pipe rows along the running direction of the sintering machine trolley are in a step reduction trend. The application provides a gas blowing device and a gas blowing method, wherein the heat storage quantity at different bellows positions is obtained by measuring the temperature of a material layer above a bellows, so that the heat compensation value required by normal production of the material layer at the different bellows positions is obtained, the gas quantity required to be blown by a blowing pipe row at a corresponding position is determined, and the stepped gas distribution of each blowing pipe row is realized by controlling a branch pipe flow control device, so that the effects of accurate blowing and energy saving are achieved.
According to the application, the temperature measuring elements are arranged on the inner side wall of the sintering machine trolley and continuously measure the temperature of the material layers, and because the combustion belt moves from top to bottom in the sintering process, the temperature of the material layers with different thicknesses above the air box is different, a row of temperature measuring elements are arranged on the inner side wall of the sintering machine trolley above the air box, and the direction of the row of temperature measuring elements is vertical to the bottom of the sintering machine trolley, so that the heat accumulation value of the material layers above the air box can be acquired more accurately. The temperature measuring element adopts a contact type temperature measuring element, such as a thermocouple, which can measure high temperature (the temperature of the material layer can reach 1400-1500 ℃ at the highest temperature during sintering).
The thermocouple is a common temperature measuring element for directly measuring the temperature and converting the temperature signal into a thermoelectromotive signal, and converting the thermoelectromotive signal into the temperature of a measured medium through an electric instrument, has high temperature resistance up to 2800 ℃, and usually consists of main parts such as a hot electrode, an insulating protection tube, a junction box and the like.
In the application, the branch pipe flow monitoring device is used for measuring the gas flow of the jetting branch pipe, the branch pipe flow control device is used for controlling the flow of the jetting branch pipe, the main pipe flow monitoring device is used for measuring the gas flow of the jetting main pipe, and the main pipe flow control device is used for controlling the flow of the jetting main pipe. For example, the flow monitoring devices can all use flow meters to measure flow, and the flow control devices can all use flow control valves to regulate and control flow.
In the application, the branch pipe flow monitoring device is arranged at the upstream end of the branch pipe flow control device, namely, during production, the fuel gas firstly passes through the branch pipe flow control device and then passes through the branch pipe flow monitoring device. When the flow of the jetting branch pipe is controlled by the branch pipe flow control device to change, the branch pipe flow monitoring device can timely and accurately monitor the changed flow value.
In the present application, the control system is connected to and controls one or more of the components of the temperature sensing element, the branch flow monitoring device, the branch flow control device, the main flow monitoring device, and the main flow control device.
In general, the outer (diameter) diameter of the gas injection pipe or the gas injection sleeve having the gas injection holes is generally 30 to 200mm, preferably 35 to 190mm, preferably 40 to 170mm, preferably 50 to 150mm, more preferably 80 to 110mm, more preferably 89 to 108mm.
In the present application, the length of the sintering machine (or the running length of the sintering machine carriage) is 70 to 140 meters, preferably 80 to 130 meters, more preferably 90 to 120 meters.
Compared with the prior art, the application has the following beneficial technical effects:
1. the energy waste rate is low: according to the application, the gas quantity required to be blown by each section of the blowing pipe row is accurately calculated by utilizing the correlation between the gas quantity proportion value required to be blown by the blowing pipe row and the air box draft quantity proportion value covered at the lower part of the blowing pipe row, and the method is implemented by the cooperation of the flow detection device and the flow regulation device. The accurate fuel gas proportioning calculation and implementation of each section of injection tube row during production are effectively realized, the situations of excessive injection fuel gas and energy waste of a certain section of material surface are avoided, and the sintering production cost and the carbon dioxide emission are reduced.
2. The auxiliary sintering effect is better: because the application precisely controls the gas injection quantity of each section of injection tube row, the phenomenon that the sintering material layer absorbs too much energy and has too high temperature due to excessive injection in the explanation of the mind is avoided, thereby generating a melting layer to destroy the quality of the finished product of the sintering ore, and effectively ensuring the auxiliary sintering effect of the whole injection device.
3. Simple structure, easy implementation: the application adds the components such as the flow detection device, the flow regulating device and the like on the basis of the prior art, does not carry out complicated transformation, has simple structure and is easy to install and implement.
Drawings
FIG. 1 is a prior art process diagram;
FIG. 2 is a schematic diagram of a gas injection device according to the present application;
FIG. 3 is a top view of the gas injection apparatus of the present application;
FIG. 4 is a schematic structural view of a 3-section injection sleeve of the present application;
FIG. 5 is a schematic diagram of a control system according to the present application;
FIG. 6 is a graph of the heat storage capacity of the material layer at different bellows positions;
FIG. 7 is a graph showing the heat compensation values required for normal production of a material layer at different bellows locations;
fig. 8 is a flow chart of a gas injection method of the present application.
Reference numerals: 1-a sintering machine trolley; 2-a blowing hood; 3-blowing device; 301-blowing a main pipe; 302-blowing a branch pipe; 303-blowing tube rows; 304-a blowing pipe; 305-blowing holes; 306-blowing a sleeve; 4-bellows; 501-a branch pipe flow monitoring device; 502-main pipe flow monitoring device; 601-a manifold flow control device; 602—a main pipe flow control device; 7-a temperature measuring element; 8-control system
Detailed Description
According to a first embodiment of the present application, there is provided a gas blowing apparatus including a sintering pallet 1, a blowing hood 2, a blowing apparatus 3, and a windbox 4; the sintering machine trolley 1 is arranged in the blowing cover 2, and the air box 4 is arranged below the sintering machine trolley 1; the blowing device 3 includes a blowing main pipe 301, a blowing branch pipe 302, and a blowing pipe row 303; the main injection pipe 301 is arranged outside the injection cover 2, the injection pipe row 303 is arranged in the injection cover 2 and is positioned above the sintering pallet 1, one end of the injection branch pipe 302 is connected with the main injection pipe 301, the other end of the injection branch pipe 302 extends into the injection cover 2 and is connected with the injection pipe row 303, the injection pipe row 303 comprises a plurality of injection pipes 304, and injection holes 305 are formed in the injection pipes 304; wherein, 2 or more than 2 injection branch pipes 302 are connected to the injection main pipe 301, each injection branch pipe 302 is connected to one injection pipe row 303, and a branch pipe flow monitoring device 501 and a branch pipe flow control device 601 are arranged on the injection branch pipe 302; the inner side wall of the sintering pallet 1 is provided with a temperature measuring element 7.
Preferably, the main pipe flow monitoring device 502 is provided on the main blowing pipe 301; preferably, the main pipe flow control device 602 is provided in the main blowing pipe 301.
Preferably, the manifold flow monitoring device 501 is disposed at the upstream end of the manifold flow control device 601.
In the present application, the apparatus comprises 12 to 45 windboxes 4, preferably 16 to 42 windboxes 4, preferably 20 to 40 windboxes 4, more preferably 24 to 35 windboxes 4; preferably, an array of temperature measuring elements 7 is arranged on the inner side wall of the sintering pallet 1 above each air box 4, and the direction of the array of temperature measuring elements 7 is perpendicular to the bottom of the sintering pallet 1.
In the present application, n injection branch pipes are connected to the injection main pipe 301, wherein: n is 2 to 10, preferably 3 to 8, more preferably 4 to 6.
In the present application, the lower portion of each blowing tube row 303 is covered with 1 to 8 windboxes 4, preferably 2 to 5 windboxes 4; preferably, the number of windboxes 4 covered by the lower portion of each blowing tube row 303 is the same.
In the present application, 1 to 10 temperature measuring elements 7, preferably 2 to 8 temperature measuring elements 7, more preferably 2 to 6 temperature measuring elements 7 are provided on the inner side wall of the sintering pallet 1 above each windbox 4.
In the present application, each of the blowing tube rows 303 includes 2 to 50 blowing tubes 304, preferably 3 to 40 blowing tubes 304, more preferably 5 to 20 blowing tubes 304; 2-100 blowing holes 305, preferably 3-50 blowing holes 305, are arranged on each blowing pipe 304; preferably, the opening direction of the blowing holes 305 is directed toward the sintering pallet 1.
Preferably, the blowing pipe 304 is a blowing sleeve 306 with 2 or more sections, the blowing sleeve 306 adopts a telescopic sleeve structure, and each section of the blowing sleeve 306 is preferably provided with a blowing hole 305.
Preferably, the blowing device further comprises a control system 8. The control system 86 is connected to the branch flow monitor 501, the branch flow controller 601, the main flow monitor 502, the main flow controller 602, and the temperature measuring element 7, and controls the branch flow controller 601 and the main flow controller 602.
According to a second embodiment of the present application, there is provided a gas injection method or a method using the above apparatus, the method including the steps of:
1) Measuring the material layer temperature of the corresponding air box position through a temperature measuring element 7 on the inner side wall of the sintering machine trolley 1 above each air box 4, and drawing a material layer heat storage curve of each air box position of the sintering machine;
2) Drawing a heat compensation value curve required by normal production of the material layer at each air box position of the sintering machine according to the material layer heat storage curve at each air box position of the sintering machine, and calculating the gas quantity required by blowing of the material layer at each air box position;
3) According to the gas quantity required to be blown by the material layer at each bellows position, the gas quantity Q required to be blown by each blowing tube row 303 is calculated n Wherein: n is 2 to 10, preferably 3 to 8, more preferably 4 to 6;
4) The system starts to run and starts to blow fuel gas;
5) The control system 8 controls the gas flow Q in each injection branch 302 by the branch flow control device 601 of each injection branch 302 n ；
6) The fuel gas is uniformly sprayed to the surface of the mineral aggregate from the spraying holes 305, and enters the mineral aggregate for sintering.
Preferably, the amount of fuel gas Q to be blown is determined for each blowing tube row 303 n The total amount Q of gas injection in the injection main pipe 301, q=q, is calculated 1 +Q 2 +……+Q n The method comprises the steps of carrying out a first treatment on the surface of the The control system 8 controls the flow rate of the gas in the injection main pipe 301 by the main pipe flow rate control device 602.
In the present application, the control system 8 calculates Q based on the calculated 1 、Q 2 、……Q n The gas flow in the first injection branch pipe 302 is controlled to Q by the branch pipe flow control device 601 on the first injection branch pipe 302 1 The method comprises the steps of carrying out a first treatment on the surface of the The gas flow in the second injection branch pipe 302 is controlled to Q by the branch pipe flow control device 601 on the second injection branch pipe 302 2 The method comprises the steps of carrying out a first treatment on the surface of the … … the gas flow in the last injection branch pipe 302 is controlled to Q by the branch pipe flow control device 601 on the last injection branch pipe 302 n 。
Preferably, the method further comprises step 7):
the gas injection amount of each injection branch pipe 302 and the injection header 301 is detected in real time:
when the gas injection quantity of each injection branch pipe 302 and each injection main pipe 301 is unchanged, the operation is continued;
when the gas injection amounts of the respective injection branch pipes 302 and injection header 301 change, the process returns to step 5).
Example 1
A gas injection device, which comprises a sintering pallet 1, an injection cover 2, an injection device 3 and a bellows 4; the sintering machine trolley 1 is arranged in the blowing cover 2, and the air box 4 is arranged below the sintering machine trolley 1; the blowing device 3 includes a blowing main pipe 301, a blowing branch pipe 302, and a blowing pipe row 303; the main injection pipe 301 is arranged outside the injection cover 2, the injection pipe row 303 is arranged in the injection cover 2 and is positioned above the sintering pallet 1, one end of the injection branch pipe 302 is connected with the main injection pipe 301, the other end of the injection branch pipe 302 extends into the injection cover 2 and is connected with the injection pipe row 303, the injection pipe row 303 comprises an injection pipe 304, and injection holes 305 are formed in the injection pipe 304; wherein, 2 injection branch pipes 302 are connected to the injection main pipe 301, each injection branch pipe 302 is connected to one injection pipe row 303, and a branch pipe flow monitoring device 501 and a branch pipe flow control device 601 are arranged on the injection branch pipe 302; the inner side wall of the sintering pallet 1 is provided with a temperature measuring element 7.
3 bellows 4 are covered on the lower portion of each blowing tube row 303, and the number of bellows 4 covered on the lower portion of each blowing tube row 303 is the same; 6 temperature measuring elements 7 are arranged on the inner side wall of the sintering pallet 1 above each bellows 4.
Each lance row 303 comprises 30 lances 304; each blowing pipe 304 is provided with 40 blowing holes 305, and the opening direction of the blowing holes 305 faces the sintering pallet 1
The blowing device further comprises a control system 8. The control system 86 is connected to the branch flow monitor 501, the branch flow control 601, and the temperature measuring element 7, and controls the branch flow control 601.
A gas injection method or a method using the above device, the method comprising the steps of:
1) Measuring the material layer temperature of the corresponding air box position through a temperature measuring element 7 on the inner side wall of the sintering machine trolley 1 above each air box 4, and drawing a material layer heat storage curve of each air box position of the sintering machine;
2) Drawing a heat compensation value curve required by normal production of the material layer at each air box position of the sintering machine according to the material layer heat storage curve at each air box position of the sintering machine, and calculating the gas quantity required by blowing of the material layer at each air box position;
3) According to the gas quantity required to be blown by the material layer at each bellows position, calculating the gas quantity Q required to be blown by the first blowing pipe row 1 And the quantity Q of the fuel gas required to be blown by the second blowing pipe row 2 ；
4) The system starts to run and starts to blow fuel gas;
5) The control system 8 via respective injection branches 302The manifold flow control device 601 controls the gas flow rate of the first injection manifold to Q 1 And the gas flow rate of the second injection branch pipe is Q 2 ；
6) The fuel gas is uniformly sprayed to the surface of the mineral aggregate from the spraying holes 305, and enters the mineral aggregate for sintering.
Example 2
A gas injection device, which comprises a sintering pallet 1, an injection cover 2, an injection device 3 and a bellows 4; the sintering machine trolley 1 is arranged in the blowing cover 2, and the air box 4 is arranged below the sintering machine trolley 1; the blowing device 3 includes a blowing main pipe 301, a blowing branch pipe 302, and a blowing pipe row 303; the main injection pipe 301 is arranged outside the injection cover 2, the injection pipe row 303 is arranged in the injection cover 2 and is positioned above the sintering pallet 1, one end of the injection branch pipe 302 is connected with the main injection pipe 301, the other end of the injection branch pipe 302 extends into the injection cover 2 and is connected with the injection pipe row 303, the injection pipe row 303 comprises an injection pipe 304, and injection holes 305 are formed in the injection pipe 304; wherein, 4 injection branch pipes 302 are connected to the injection main pipe 301, each injection branch pipe 302 is connected to one injection pipe row 303, and a branch pipe flow monitoring device 501 and a branch pipe flow control device 601 are arranged on the injection branch pipe 302; the inner side wall of the sintering pallet 1 is provided with a temperature measuring element 7.
The main pipe 301 is provided with a main pipe flow rate monitor 502 and a main pipe flow rate controller 602, and the branch pipe flow rate monitor 501 is provided at the upstream end of the branch pipe flow rate controller 601.
The device comprises 30 bellows 4, wherein a row of temperature measuring elements 7 are arranged on the inner side wall of the sintering pallet 1 above each bellows 4, the direction of the row of temperature measuring elements 7 is perpendicular to the bottom of the sintering pallet 1, and 4 temperature measuring elements are arranged above each bellows.
The lower portion of each blowing tube row 303 is covered with 5 windboxes 4, and the number of windboxes 4 covered by the lower portion of each blowing tube row 303 is the same.
Each blowing pipe row 303 comprises 20 blowing pipes 304, 2-100 blowing holes 305, preferably 30 blowing holes 305 are formed in each blowing pipe 304, and the opening direction of the blowing holes 305 faces the sintering pallet 1; the blowing pipe 304 is a blowing sleeve 306 with 2 or more sections, the blowing sleeve 306 adopts a telescopic sleeve structure, and each section of the blowing sleeve 306 is provided with a blowing hole 305.
The blowing device further comprises a control system 8. The control system 86 is connected to the branch flow monitor 501, the branch flow controller 601, the main flow monitor 502, the main flow controller 602, and the temperature measuring element 7, and controls the branch flow controller 601 and the main flow controller 602.
A gas injection method or a method using the above device, the method comprising the steps of:
1) Measuring the material layer temperature of the corresponding air box position through a temperature measuring element 7 on the inner side wall of the sintering machine trolley 1 above each air box 4, and drawing a material layer heat storage curve of each air box position of the sintering machine;
2) Drawing a heat compensation value curve required by normal production of the material layer at each air box position of the sintering machine according to the material layer heat storage curve at each air box position of the sintering machine, and calculating the gas quantity required by blowing of the material layer at each air box position;
3) According to the gas quantity required to be blown by the material layer at each bellows position, calculating the gas quantity Q required to be blown by the first blowing pipe row 1 The second injection tube row needs the injected fuel gas quantity Q 2 The third injection tube row needs the injected fuel gas quantity Q 3 The fourth injection tube row needs the injected fuel gas quantity Q 4 ；
4) The system starts to run and starts to blow fuel gas;
5) The control system 8 controls the gas flow rate of the first injection branch pipe to Q through the branch pipe flow rate control device 601 of each injection branch pipe 302 1 The gas flow rate of the second injection branch pipe is Q 2 The gas flow rate of the third injection branch pipe is Q 3 The gas flow rate of the fourth injection branch pipe is Q 4 ；
6) The fuel gas is uniformly sprayed to the surface of the mineral aggregate from the spraying holes 305, and enters the mineral aggregate for sintering.
Wherein, according to the quantity Q of the gas to be blown by each blowing tube row 303 1 、Q 2 、Q 3 、Q 4 The total amount Q of gas injection in the injection main pipe 301, q=q, is calculated 1 +Q 2 +Q 3 +Q 4 The method comprises the steps of carrying out a first treatment on the surface of the The control system 8 controls the flow rate of the gas in the injection main pipe 301 to Q by the main pipe flow rate control device 602.
Example 3
Example 2 was repeated except that the method further comprises step 7):
the gas injection amount of each injection branch pipe 302 and the injection header 301 is detected in real time:
when the gas injection quantity of each injection branch pipe 302 and each injection main pipe 301 is unchanged, the operation is continued;
when the gas injection amounts of the respective injection branch pipes 302 and injection header 301 change, the process returns to step 5).
Claims (18)
1. A gas injection method is characterized in that: the method comprises the following steps:
1) Measuring the material layer temperature of the corresponding air box position through a temperature measuring element (7) on the inner side wall of the sintering machine trolley (1) above each air box (4), and drawing a material layer heat storage curve of each air box position of the sintering machine;
2) Drawing a heat compensation value curve required by normal production of the material layer at each air box position of the sintering machine according to the material layer heat storage curve at each air box position of the sintering machine, and calculating the gas quantity required by blowing of the material layer at each air box position;
3) According to the gas quantity required to be blown by the material layer at the position of each bellows, the gas quantity Q required to be blown by each blowing pipe row (303) is calculated n Wherein: n is 2-10;
4) The system starts to run and starts to blow fuel gas;
5) The control system (8) controls the gas flow rate Q in each injection branch pipe (302) through a branch pipe flow control device (601) of each injection branch pipe (302) n ；
6) The fuel gas is uniformly sprayed to the surface of the mineral aggregate from the spraying holes (305) and enters the mineral aggregate for sintering.
2. The method according to claim 1, characterized in that: n is 3-8.
3. The method according to claim 2, characterized in that: n is 4-6.
4. A method according to any one of claims 1-3, characterized in that: according to the quantity Q of the fuel gas required to be blown by each blowing pipe row (303) n The total amount of gas injection Q, Q=Q in the main injection pipe (301) is calculated 1 +Q 2 +……+Q n The method comprises the steps of carrying out a first treatment on the surface of the The control system (8) controls the flow of the fuel gas in the injection main pipe (301) through the main pipe flow control device (602); and/or
The control system (8) calculates Q based on the calculated 1 、Q 2 、……Q n The gas flow in the first injection branch pipe (302) is controlled to be Q by a branch pipe flow control device (601) on the first injection branch pipe (302) 1 The method comprises the steps of carrying out a first treatment on the surface of the Controlling the gas flow in the second injection branch pipe (302) to be Q through a branch pipe flow control device (601) on the second injection branch pipe (302) 2 The method comprises the steps of carrying out a first treatment on the surface of the … … the gas flow in the last injection branch pipe (302) is controlled to be Q by a branch pipe flow control device (601) on the last injection branch pipe (302) n 。
5. A method according to any one of claims 1-3, characterized in that: the method further comprises step 7):
detecting the gas injection quantity of each injection branch pipe (302) and each injection main pipe (301) in real time:
when the gas injection quantity of each injection branch pipe (302) and the injection main pipe (301) is unchanged, continuing to operate;
and (5) returning to the step (5) when the gas injection quantity of each injection branch pipe (302) and the injection main pipe (301) changes.
6. The method according to claim 4, wherein: the method further comprises step 7):
detecting the gas injection quantity of each injection branch pipe (302) and each injection main pipe (301) in real time:
when the gas injection quantity of each injection branch pipe (302) and the injection main pipe (301) is unchanged, continuing to operate;
and (5) returning to the step (5) when the gas injection quantity of each injection branch pipe (302) and the injection main pipe (301) changes.
7. The method according to claim 1, characterized in that: the method is carried out by adopting a gas injection device, wherein the gas injection device comprises a sintering machine trolley (1), an injection cover (2), an injection device (3) and an air box (4); the sintering machine trolley (1) is arranged in the blowing cover (2), and the air box (4) is arranged below the sintering machine trolley (1); the blowing device (3) comprises a blowing main pipe (301), a blowing branch pipe (302) and a blowing pipe row (303); the main injection pipe (301) is arranged at the outer side of the injection cover (2), the injection pipe row (303) is arranged in the injection cover (2) and is positioned above the sintering pallet (1), one end of the injection branch pipe (302) is connected with the main injection pipe (301), the other end of the injection branch pipe (302) stretches into the injection cover (2) to be connected with the injection pipe row (303), the injection pipe row (303) comprises a plurality of injection pipes (304), and injection holes (305) are formed in the injection pipes (304); wherein, 2 or more than 2 jetting branch pipes (302) are connected on the jetting main pipe (301), each jetting branch pipe (302) is connected with one jetting pipe row (303), and a branch pipe flow monitoring device (501) and a branch pipe flow control device (601) are arranged on the jetting branch pipe (302); the inner side wall of the sintering machine trolley (1) is provided with a temperature measuring element (7).
8. The method according to claim 7, wherein: a main pipe flow monitoring device (502) is arranged on the blowing main pipe (301); a main pipe flow control device (602) is arranged on the blowing main pipe (301); and/or
The manifold flow monitor (501) is disposed at an upstream end of the manifold flow control device (601).
9. The method according to claim 7 or 8, characterized in that: the device comprises 16-42 bellows (4), wherein a row of temperature measuring elements (7) are arranged on the inner side wall of a sintering machine trolley (1) above each bellows (4), and the direction of the row of temperature measuring elements (7) is perpendicular to the bottom of the sintering machine trolley (1); and/or
The jetting is responsible for (301) is connected with n jetting branch pipes, wherein: n is 2-10.
10. The method according to claim 9, wherein: the device comprises 20-40 bellows (4); and/or
n is 3-8.
11. The method according to claim 10, wherein: n is 4-6.
12. The method according to claim 9, wherein: 1-8 bellows (4) are covered on the lower part of each blowing pipe row (303), and the number of bellows (4) covered on the lower part of each blowing pipe row (303) is the same; and/or
1-10 temperature measuring elements (7) are arranged on the inner side wall of the sintering machine trolley (1) above each air box (4).
13. The method according to claim 12, wherein: the lower part of each blowing pipe row (303) is covered with 2-5 bellows (4); and/or
2-8 temperature measuring elements (7) are arranged on the inner side wall of the sintering machine trolley (1) above each bellows (4).
14. The method according to claim 13, wherein: 2-6 temperature measuring elements (7) are arranged on the inner side wall of the sintering machine trolley (1) above each bellows (4).
15. The method according to any one of claims 7-8, 10-14, characterized in that: each blowing tube row (303) comprises 2-50 blowing tubes (304); 2-100 injection holes (305) are arranged on each injection pipe (304), and the opening direction of each injection hole (305) faces the sintering machine trolley (1); and/or
The blowing pipe (304) is a blowing sleeve (306) with 2 sections or more than 2 sections, the blowing sleeve (306) adopts a telescopic sleeve structure, and each section of the blowing sleeve (306) is provided with a blowing hole (305).
16. The method according to claim 15, wherein: each blowing tube row (303) comprises 3-40 blowing tubes (304); 3-50 blowing holes (305) are arranged on each blowing pipe (304).
17. The method according to claim 16, wherein: each blowing tube row (303) comprises 5-20 blowing tubes (304).
18. The method according to any one of claims 7-8, 10-14, 16-17, wherein: the blowing device further comprises a control system (8); the control system (8) is connected with the branch pipe flow monitoring device (501), the branch pipe flow control device (601), the main pipe flow monitoring device (502), the main pipe flow control device (602) and the temperature measuring element (7), and controls the branch pipe flow control device (601) and the main pipe flow control device (602).
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| CN110592370B (en) * | 2019-09-09 | 2020-10-09 | 中南大学 | Low-carbon and low-emission sintering method based on coupling injection of multiple types of fuel gases |
| CN110564952B (en) * | 2019-09-09 | 2020-10-16 | 中南大学 | Sintering energy-saving emission-reducing hydrogen-based fuel gas staged injection method |
| CN111551032B (en) * | 2020-05-15 | 2021-05-04 | 西安交通大学 | Sintering online regulation and control method and system based on gas injection |
| CN112797796B (en) * | 2021-01-06 | 2022-06-07 | 中冶长天国际工程有限责任公司 | Device for spraying water vapor on sintering material surface and control method thereof |
| CN115218667A (en) * | 2021-11-22 | 2022-10-21 | 中冶长天国际工程有限责任公司 | Gas flow decreasing intermittent injection auxiliary sintering method |
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