CN108120298B - Gas injection device and gas injection method - Google Patents
Gas injection device and gas injection method Download PDFInfo
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- CN108120298B CN108120298B CN201710512440.9A CN201710512440A CN108120298B CN 108120298 B CN108120298 B CN 108120298B CN 201710512440 A CN201710512440 A CN 201710512440A CN 108120298 B CN108120298 B CN 108120298B
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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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Abstract
The application provides a gas injection device and a gas injection method. The blowing device comprises a blowing main pipe, a blowing branch pipe and a blowing pipe row. The bottom of the bellows is connected with a bellows straight pipe section, and a bellows flow monitoring device is arranged in the bellows straight pipe section. The gas injection method comprises the following steps: the system starts to run and starts to blow fuel gas; the control system controls the gas flow in each jetting branch pipe through the branch pipe flow control device; the fuel gas is evenly sprayed to the surface of the mineral aggregate from the spraying holes, and enters the mineral aggregate for sintering. The application realizes the accurate step gas distribution of the gas injection, has simple structure, is easy to implement, reduces energy waste and has better auxiliary sintering effect.
Description
Technical Field
The application relates to a gas injection device and a gas injection method of a sintering machine, in particular to a gas injection device and a sintering process of the sintering machine, which can perform 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 such a large environment, "technology for injecting gas fuel on a sinter level" developed by JFE corporation, has been developed, and the principle is that a gas fuel diluted below the lower limit of the combustible concentration is injected above a sintering machine carriage exemplified by the rear end of an ignition furnace by an injection device, so that the gas fuel 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 and the gas blowing method, the total amount of gas required to be blown by the blowing device and the gas required to be blown by each section of blowing pipe row are calculated according to the flow meter of the bellows covered at the corresponding lower part of each section of blowing pipe row, the gas required to be blown by each section of blowing pipe row can be accurately controlled, stepped gas distribution is carried out, energy saving, 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.
A gas injection device comprises a sintering machine trolley, an injection cover (or a sealing cover), an injection 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, be connected with 2 or more jetting branch pipes on the jetting is responsible for, every jetting branch pipe connection jetting bank of tubes, the bottom of bellows is connected with bellows straight tube section 401, is equipped with bellows flow monitoring devices in the bellows straight tube section.
Preferably, the injection branch pipe is provided with a branch pipe flow monitoring device and a branch pipe flow control device; more preferably, the manifold flow monitoring device is disposed at an upstream end of the manifold flow control device.
Preferably, a main pipe flow monitoring device is arranged on the jetting main pipe; more preferably, the main pipe flow control device is provided on the main blowing pipe.
In the application, the length of the straight pipe section of the bellows is a, and the pipe diameter of the straight pipe section of the bellows is b; wherein: a is not less than 5b, preferably not less than 8b, more preferably not less than 10b; preferably, the bellows flow monitor is located at B in the length direction of the bellows straight tube section, where B is a distance of 1/10a-1/2a, preferably 1/5a-2/5a, more preferably 1/4a-1/3a, from the top of the bellows straight tube section.
In the present application, the apparatus comprises 12 to 45 bellows, preferably 16 to 42 bellows, preferably 20 to 40 bellows, more preferably 24 to 35 bellows.
In the application, 2-6 jetting branch pipes, preferably 3 or 4 jetting branch pipes, are connected or arranged on the jetting main pipe.
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 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 of 2 or more (for example, 4 sections), the blowing sleeve is a telescopic sleeve structure, and more 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 bellows flow monitoring device, the branch pipe flow control device, the main pipe flow monitoring device and the main pipe flow control device and controls the operation of the branch pipe flow control device and the main pipe flow control device.
According to a second embodiment of the present application, a gas blowing method or a method using the above gas blowing apparatus is provided, and in particular, a gas blowing method capable of precisely calculating and controlling a gas blowing amount of each stage of blowing tube row according to a bellows flow rate is provided.
A gas injection method, the method comprising the steps of:
1) The system starts to run and starts to blow fuel gas;
2) The air box flow monitoring device monitors the flow W of each air box, and the control system controls the gas flow in each jetting branch pipe through the branch pipe flow control device;
3) 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, the step 2) is specifically:
a) Numbering bellows covered on the lower part of the blowing pipe row, wherein the bellows are sequentially 1 and 2 … … n;
wherein: the bellows 4 covered at the lower part of the first blowing pipe row is 1 and 2 … … x;
the bellows covered at the lower part of the second blowing pipe row is x+1 and x+2 … … y;
……
the bellows 4 covered at the lower part of the last blowing pipe row is z+1 and z+2 … … n;
b) The flow rate of each bellows is monitored by a bellows flow rate monitoring device in a bellows straight pipe section at the lower part of each bellows, and is sequentially recorded as W 1 、W 2 、……W n ；
c) Calculating the total quantity Q of the fuel gas required to be blown by the whole sintering machine according to the flow monitored by each bellows flow monitoring device; wherein the method comprises the steps ofZeta is the volume concentration value of the injected gas;
d) Calculating the injection quantity of fuel gas in each injection pipe; wherein:
injection quantity Q of gas in first injection pipe 1 The method comprises the following steps:
injection quantity Q of gas in second injection pipe 2 The method comprises the following steps:
……
quantity Q of gas injected into last injection pipe Rear part (S) The method comprises the following steps:
e) The control system controls the gas flow in the jetting main pipe to be Q through the main pipe flow control device according to the calculated total gas quantity Q;
the control system calculates Q according to the calculation 1 、Q 2 、……Q Rear part (S) 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 Rear part (S) 。
Preferably, step 2) further comprises f):
the air box flow monitoring device monitors the flow of each air box in real time, and the main pipe flow monitoring device monitors the gas flow of the jetting main pipe in real time:
when the flow of each bellows and the gas flow of the jetting manifold are unchanged, continuing to operate;
and (c) returning to the step (b) when the flow rate of each bellows and the gas flow rate of the jetting manifold change.
In the above method, x, y, z, n is a positive integer, and is related to the number of bellows covered at the lower part of each blowing tube row. In the gas blowing device, the lower part of each blowing pipe row is covered with 1-8 bellows, preferably 2-5 bellows; preferably, the number of windboxes covered by the lower portion of each blowing tube row is the same. For example, 3 blowing branch pipes are linked on a blowing header pipe in the device, the lower part of the first blowing pipe row covers 2 bellows (x=2), the lower part of the second blowing pipe row covers 2 bellows (y=4), the lower part of the third blowing pipe row covers 2 bellows (y=6), the bellows covered by the lower part of the blowing pipe row are marked as 1, 2, 3, 4, 5 and 6 in sequence, and the flow rate of each bellows is marked as W in sequence 1 、W 2 、W 3 、W 4 、W 5 、W 6 Then
Injection quantity Q of fuel gas in first injection tube row 1 The method comprises the following steps:
injection quantity Q of gas in the second injection tube row 2 The method comprises the following steps:
injection quantity Q of gas in third injection tube row 3 The method comprises the following steps:
during sintering production, a certain correlation exists between the ratio value of the gas quantity required to be blown by each section of blowing tube row and the ratio value of the air draft quantity of the air box covered at the lower part of the blowing tube row, namely the ratio value of the gas quantity required to be blown by each section of blowing tube row is equal to the ratio value of the air draft quantity of the air box covered at the lower part of the blowing tube row to the third power. We found and utilized this relationship, a gas blowing apparatus and a gas blowing method capable of achieving accurate gas distribution of each blowing tube row were developed. In the application, the bellows flow monitoring device monitors the flow of each bellows, and calculates the total amount of the gas required to be blown by the blowing device according to the sum of the flow of each bellows and the coefficient value, thereby calculating the amount of the gas required to be blown by each blowing tube row. The main pipe flow control device and the branch pipe flow control devices respectively control the flow of the injection main pipe and the flow of each injection pipe row to reach a calculated value (matched with the main pipe flow monitoring device and the branch pipe flow monitoring device), and then the cascade gas distribution of each section of injection pipe row is accurately realized. The application also comprises a corresponding flow feedback control method, which can adaptively adjust the gas injection quantity of the injection pipe at each section according to the actual parameter change and the production condition, thereby avoiding excessive gas injection and saving energy.
In the present application, a bellows flow rate monitoring device is used to monitor the flow rate of bellows, one bellows corresponding to each bellows flow rate monitoring device. The distance between the position of the bellows flow monitoring device and the top of the bellows straight pipe section is relatively short, namely the length of the windward bellows straight pipe section is shorter than that of the back bellows straight pipe section.
In the present application, the control system is connected to one or more of the members of the bellows flow monitoring device, the main flow control device, the branch flow monitoring device, and the branch flow control device, and one or more of the members may be controlled.
In the present application, the devices not illustrated are all devices commonly known in the art, and are well known to those skilled in the art.
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 schematic process diagram of the present application;
FIG. 2 is a top view of a fuel gas injection apparatus according to the present application;
FIG. 3 is a schematic view of a 3-section injection sleeve according to the present application;
FIG. 4 is a schematic diagram of a control system according to the present application;
fig. 5 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; 401-bellows straight tube section; 5-bellows flow monitoring device; 601-a branch flow monitoring device; 602-a main pipe flow monitoring device; 701-branch flow control device; 702—a main pipe flow control device; 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, be connected with 2 or more jetting branch pipes 302 on the jetting main pipe 301, every jetting branch pipe 302 connects a jetting pipe row 303, and the bottom of bellows 4 is connected with bellows straight tube section 401, is equipped with bellows flow monitoring devices 5 in the bellows straight tube section 401.
Preferably, the blowing branch pipe 302 is provided with a branch pipe flow monitoring device 601 and a branch pipe flow control device 701; more preferably, the manifold flow monitoring device 601 is disposed at the upstream end of the manifold flow control device 701.
Preferably, the main pipe flow monitoring device 602 is provided on the main blowing pipe 301; more preferably, the main pipe flow control device 702 is provided in the blowing main pipe 301.
In the application, the length of the straight pipe section 401 of the bellows is a, and the pipe diameter of the straight pipe section 401 of the bellows is b; wherein: a is not less than 5b, preferably not less than 8b, more preferably not less than 10b; preferably, the bellows flow monitor 5 is disposed at a distance B in the length direction of the bellows straight tube 401 of 1/10a-1/2a, preferably 1/5a-2/5a, more preferably 1/4a-1/3a from the top of the bellows straight tube 401.
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;
in the present application, 2 to 6 injection branch pipes 302, preferably 3 or 4 injection branch pipes 302, are connected to the injection main pipe 301.
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, 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 preferably, each section of the blowing sleeve 306 is provided with a blowing hole 305.
Preferably, the blowing device further comprises a control system 8. The control system 8 is connected to the bellows flow rate monitor 5, the branch flow rate monitor 601, the branch flow rate monitor 701, the main pipe flow rate monitor 602, and the main pipe flow rate monitor 702, and controls the branch flow rate monitor 701 and the main pipe flow rate monitor 702.
According to a second embodiment of the present application, there is provided a gas injection method or a method using the above gas injection apparatus, the method including the steps of:
1) The system starts to run and starts to blow fuel gas;
2) The bellows flow monitoring device 5 monitors the flow W of each bellows, and the control system 8 controls the gas flow in each injection manifold 302 through the manifold flow control device 701;
3) 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.
In the application, the step 2) is specifically:
a) The bellows 4 covered on the lower part of the blowing tube row 303 is numbered, and 1 and 2 … … n are sequentially arranged;
wherein: the bellows 4 covered at the lower part of the first blowing pipe row 303 is 1 and 2 … … x;
the bellows 4 covered at the lower part of the second blowing tube row 303 is x+1, x+2 … … y;
……
the bellows 4 covered at the lower part of the last blowing pipe row 303 is z+1 and z+2 … … n;
b) The bellows flow monitoring device 5 in the lower bellows straight tube section 401 of each bellows 4 monitors the flow of each bellows, and is sequentially denoted as W 1 、W 2 、……W n ；
c) According to the flow rate monitored by each bellows flow rate monitoring device 5, calculating the total quantity Q of the fuel gas required to be blown by the whole sintering machine; wherein the method comprises the steps ofWherein ζ is the volume concentration value of the injected gas;
d) Calculating the injection quantity of the fuel gas in each injection tube row 303; wherein:
injection quantity Q of fuel gas in first injection pipe row 303 1 The method comprises the following steps:
injection quantity Q of fuel gas in second injection pipe row 303 2 The method comprises the following steps:
……
injection quantity Q of fuel gas in last injection tube row 303 Rear part (S) The method comprises the following steps:
e) The control system 8 controls the gas flow rate in the injection main 301 to be Q by the main flow rate control device 702 based on the calculated total gas flow rate Q;
the control system 8 calculates Q based on the calculated 1 、Q 2 、……Q Rear part (S) The gas flow in the first injection branch pipe 302 is controlled to Q by the branch pipe flow control device 701 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 flow rate of the gas in the second injection branch pipe 302 is controlled to be Q by the branch pipe flow rate control device 701 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 302 is controlled to Q by the branch flow control device 701 on the last injection branch 302 Rear part (S) 。
Preferably, step 2) further comprises f):
the bellows flow monitoring device 5 monitors the flow rate of each bellows 4 in real time, and the manifold flow monitoring device 602 monitors the gas flow rate of the injection manifold 301 in real time:
when the flow rate of each bellows 4 and the gas flow rate of the injection header 301 are unchanged, continuing to operate;
when the flow rate of each windbox 4 and the gas flow rate of the blowing header 301 change, the process returns to step b).
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 a plurality of injection pipes 304, and injection holes 305 are formed in the injection pipes 304; wherein, be connected with 2 jetting branch pipes 302 on the jetting main pipe 301, every jetting branch pipe 302 connects a jetting bank of pipes 303, and the bottom of bellows 4 is connected with bellows straight tube section 401, is equipped with bellows flow monitoring devices 5 in the bellows straight tube section 401.
Each lance row 303 comprises 20 lances 304; each blowing pipe 304 is provided with 30 blowing holes 305, the blowing pipe 304 is a 3-section blowing sleeve 306, the blowing sleeve 306 adopts a telescopic sleeve structure, each section of the blowing sleeve 306 is provided with a blowing hole 305, and the opening direction of the blowing hole 305 faces the sintering pallet 1.
The blowing branch pipe 302 is provided with a branch pipe flow monitoring device 601 and a branch pipe flow control device 701.
The length of the bellows branch pipe section 401 is 10 times of the diameter of the bellows straight pipe section 401, and the bellows flow monitoring device 5 is arranged at the position B of the bellows straight pipe section 401, wherein the distance from the position B to the bellows straight pipe section 401 is 3 times of the diameter of the bellows straight pipe section 401.
The device comprises 25 bellows, the lower part of the first blowing pipe row covers 3 bellows 4, and the lower part of the second blowing pipe row covers 3 bellows 4.
The device also comprises a control system 8, wherein the control system 8 is connected with the bellows flow monitoring device 5, the branch flow monitoring device 601 and the branch flow control device 701 and controls the branch flow control device 701.
A gas injection method or a method using the device, comprising the steps of:
1) The system starts to run and starts to blow fuel gas;
2) The bellows flow monitoring device 5 monitors the flow W of each bellows, and the control system 8 controls the gas flow in each injection manifold 302 through the manifold flow control device 701;
3) 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 a plurality of injection pipes 304, and injection holes 305 are formed in the injection pipes 304; wherein, be connected with 2 jetting branch pipes 302 on the jetting main pipe 301, every jetting branch pipe 302 connects a jetting bank of pipes 303, and the bottom of bellows 4 is connected with bellows straight tube section 401, is equipped with bellows flow monitoring devices 5 in the bellows straight tube section 401.
Each lance row 303 comprises 20 lances 304; each blowing pipe 304 is provided with 30 blowing holes 305, the blowing pipe 304 is a 3-section blowing sleeve 306, 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 branch pipe 302 is provided with a branch pipe flow monitoring device 601 and a branch pipe flow control device 701.
The blowing main pipe 301 is provided with a main pipe flow rate monitoring device 602 and a main pipe flow rate control device 702.
The length of the bellows branch pipe section 401 is 20 times of the diameter of the bellows straight pipe section 401, and the bellows flow monitoring device 5 is arranged at the position B of the bellows straight pipe section 401, wherein the distance from the position B to the bellows straight pipe section 401 is 5 times of the diameter of the bellows straight pipe section 401.
The device comprises 25 bellows, the lower part of the first blowing pipe row covers 3 bellows 4, and the lower part of the second blowing pipe row covers 3 bellows 4.
The device also comprises a control system 8, wherein the control system 8 is connected with the bellows flow monitoring device 5, the branch flow monitoring device 601, the branch flow control device 701, the main pipe flow monitoring device 602 and the main pipe flow control device 702, and controls the branch flow control device 701 and the main pipe flow control device 702.
A gas injection method or a method using the device, comprising the steps of:
1) The system starts to run and starts to blow fuel gas;
2) The bellows flow monitor 5 monitors the flow W of each bellows, and the control system 8 controls the gas flow in each of the injection manifolds 302 through the manifold flow control device 701, specifically:
a) The bellows 4 covered on the lower part of the blowing tube row 303 is numbered, and 1, 2, 3, 4, 5 and 6 are sequentially arranged;
wherein: the bellows 4 covered on the lower part of the first blowing pipe row 303 is 1, 2 and 3;
the bellows 4 covered at the lower part of the second blowing pipe row 303 are 4, 5 and 6;
b) The bellows flow monitoring device 5 in the lower bellows straight tube section 401 of each bellows 4 monitors the flow of each bellows, and is sequentially denoted as W 1 、W 2 、W 3 、W 4 、W 5 、W 6 ；
c) According to the flow rate monitored by each bellows flow rate monitoring device 5, calculating the total quantity Q of the fuel gas required to be blown by the whole sintering machine;
wherein the method comprises the steps ofZeta is the volume concentration value of the injected gas;
d) Calculating the injection quantity of the fuel gas in each injection tube row 303; wherein:
injection quantity Q of fuel gas in first injection pipe row 303 1 The method comprises the following steps:
injection quantity Q of fuel gas in second injection pipe row 303 2 The method comprises the following steps:
e) The control system 8 controls the gas flow rate in the injection main 301 to be Q by the main flow rate control device 702 based on the calculated total gas flow rate Q;
the control system 8 calculates Q based on the calculated 1 、Q 2 The gas flow in the first injection branch pipe 302 is controlled to Q by the branch pipe flow control device 701 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 flow rate of the gas in the second injection branch pipe 302 is controlled to be Q by the branch pipe flow rate control device 701 on the second injection branch pipe 302 2 ；
3) 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 3
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 a plurality of injection pipes 304, and injection holes 305 are formed in the injection pipes 304; wherein, be connected with 3 jetting branch pipes 302 on the jetting main pipe 301, every jetting branch pipe 302 connects a jetting bank of pipes 303, and the bottom of bellows 4 is connected with bellows straight tube section 401, is equipped with bellows flow monitoring devices 5 in the bellows straight tube section 401.
Each lance row 303 comprises 20 lances 304; each blowing pipe 304 is provided with 30 blowing holes 305.
The blowing branch pipe 302 is provided with a branch pipe flow monitoring device 601 and a branch pipe flow control device 701.
The length of the bellows branch pipe section 401 is 15 times of the diameter of the bellows straight pipe section 401, and the bellows flow monitoring device 5 is arranged at the position B of the bellows straight pipe section 401, wherein the distance from the position B to the bellows straight pipe section 401 is 5 times of the diameter of the bellows straight pipe section 401.
The device comprises 20 bellows, wherein the lower part of a first injection branch pipe covers 2 bellows, the lower part of a second injection branch pipe covers 2 bellows, and the lower part of a third injection branch pipe covers 2 bellows.
A gas injection method or a method using the device, comprising the steps of:
1) The system starts to run and starts to blow fuel gas;
2) The bellows flow monitor 5 monitors the flow W of each bellows, and the control system 8 controls the gas flow in each of the injection manifolds 302 through the manifold flow control device 701, specifically:
a) The bellows 4 covered on the lower part of the blowing tube row 303 is numbered, and 1, 2, 3, 4, 5 and 6 are sequentially arranged;
wherein: the bellows 4 covered on the lower part of the first blowing pipe row 303 is 1 and 2;
the bellows 4 covered at the lower part of the second blowing pipe row 303 is 3 and 4;
the bellows 4 covered at the lower part of the third blowing pipe row 303 is 5 and 6;
b) The bellows flow monitoring device 5 in the lower bellows straight tube section 401 of each bellows 4 monitors the flow of each bellows, and is sequentially denoted as W 1 、W 2 、W 3 、W 4 、W 5 、W 6 ；
c) According to the flow rate monitored by each bellows flow rate monitoring device 5, calculating the total quantity Q of the fuel gas required to be blown by the whole sintering machine; wherein the method comprises the steps ofWherein ζ is the volume concentration value of the injected gas;
d) Calculating the injection quantity of the fuel gas in each injection tube row 303; wherein:
injection quantity Q of fuel gas in first injection pipe row 303 1 The method comprises the following steps:
injection quantity Q of fuel gas in second injection pipe row 303 2 The method comprises the following steps:
injection quantity Q of fuel gas in third injection pipe row 303 3 The method comprises the following steps:
e) The control system 8 controls the gas flow rate in the injection main 301 to be Q by the main flow rate control device 702 based on the calculated total gas flow rate Q;
the control system 8 calculates Q based on the calculated 1 、Q 2 The gas flow in the first injection branch pipe 302 is controlled to Q by the branch pipe flow control device 701 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 flow rate of the gas in the second injection branch pipe 302 is controlled to be Q by the branch pipe flow rate control device 701 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 third injection branch pipe 302 is controlled to be Q by the branch pipe flow control device 701 on the third injection branch pipe 302 3 ；
3) 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 4
Example 3 is repeated except that step 2) further comprises f):
the bellows flow monitoring device 5 monitors the flow rate of each bellows 4 in real time, and the manifold flow monitoring device 602 monitors the gas flow rate of the injection manifold 301 in real time:
when the flow rate of each bellows 4 and the gas flow rate of the injection header 301 are unchanged, continuing to operate;
when the flow rate of each windbox 4 and the gas flow rate of the blowing header 301 change, the process returns to step b).
Claims (21)
1. A gas injection method, the method comprising the steps of:
1) The system starts to run and starts to blow fuel gas;
2) The bellows flow monitoring device (5) monitors the flow W of each bellows, and the control system (8) controls the gas flow in each injection branch pipe (302) through the branch pipe flow control device (701);
3) 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;
the step 2) is specifically as follows:
a) Numbering bellows (4) covered on the lower part of the blowing pipe row (303), wherein the bellows are sequentially 1 and 2 … … n;
wherein: the bellows (4) covered on the lower part of the first blowing pipe row (303) is 1 and 2 … … x;
the bellows (4) covered on the lower part of the second blowing tube row (303) is x+1, x+2 … … y;
……
the bellows (4) covered at the lower part of the last blowing pipe row (303) is z+1, z+2 … … n;
b) The bellows flow monitoring device (5) in the lower bellows straight pipe section (401) of each bellows (4) monitors the flow of each bellows, and is sequentially marked as W 1 、W 2 、……W n ；
c) According to the flow monitored by each bellows flow monitoring device (5), calculating the total quantity Q of the fuel gas required to be blown by the whole sintering machine; wherein the method comprises the steps ofZeta is the volume concentration value of the injected gas;
d) Calculating the injection quantity of the fuel gas in each injection tube row (303); wherein:
injection quantity Q of fuel gas in first injection pipe row (303) 1 The method comprises the following steps:
injection quantity Q of fuel gas in second injection pipe row (303) 2 The method comprises the following steps:
……
the injection quantity Q of the fuel gas in the last injection pipe row (303) Rear part (S) The method comprises the following steps:
e) The control system (8) controls the gas flow in the jetting main pipe (301) to be Q through the main pipe flow control device (702) according to the calculated total gas quantity Q;
the control system (8) calculates Q based on the calculated 1 、Q 2 、……Q Rear part (S) The gas flow in the first injection branch pipe (302) is controlled to be Q by a branch pipe flow control device (701) 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 (701) 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 (701) on the last injection branch pipe (302) Rear part (S) 。
2. The method according to claim 1, characterized in that: step 2) further comprises f):
detecting the air extraction quantity of each air box (4) of the sintering pallet (1) and the gas injection quantity of the injection main pipe (301) in real time:
when the air extraction quantity of each bellows (4) of the sintering pallet (1) and the gas injection quantity of the injection main pipe (301) are unchanged, continuing to operate;
and (c) returning to the step (b) when the air extraction quantity of each air box (4) of the sintering pallet (1) and the gas injection quantity of the injection main pipe (301) change.
3. A gas injection device for use in the method of claim 1 or 2, the device comprising a sintering pallet (1), an injection hood (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) 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, be connected with 2 or more jetting branch pipes (302) on jetting main pipe (301), every jetting branch pipe (302) is connected with a jetting bank of pipes (303), and the bottom of bellows (4) is connected with bellows straight tube section (401), is equipped with bellows flow monitoring devices (5) in bellows straight tube section (401).
4. A device according to claim 3, characterized in that: the blowing branch pipe (302) is provided with a branch pipe flow monitoring device (601) and a branch pipe flow control device (701); and/or
The blowing main pipe (301) is provided with a main pipe flow monitoring device (602).
5. The apparatus according to claim 4, wherein: the branch pipe flow monitoring device (601) is arranged at the upstream end of the branch pipe flow control device (701); and/or
The main pipe flow control device (702) is arranged on the blowing main pipe (301).
6. The apparatus according to any one of claims 3-5, wherein: the length of the straight tube section (401) of the bellows is a, and the tube diameter of the straight tube section (401) of the bellows is b; wherein: a is more than or equal to 5b.
7. The apparatus according to claim 6, wherein: the length of the straight tube section (401) of the bellows is a, and the tube diameter of the straight tube section (401) of the bellows is b; wherein: a is more than or equal to 8b.
8. The apparatus according to claim 7, wherein: the length of the straight tube section (401) of the bellows is a, and the tube diameter of the straight tube section (401) of the bellows is b; wherein: a is more than or equal to 10b.
9. The apparatus according to claim 6, wherein: the bellows flow monitoring device (5) is arranged at a position B in the length direction of the bellows straight pipe section (401), and the distance from the position B to the top of the bellows straight pipe section (401) is 1/10a-1/2 a.
10. The apparatus according to claim 9, wherein: the bellows flow monitoring device (5) is arranged at a position B in the length direction of the bellows straight pipe section (401), and the distance from the position B to the top of the bellows straight pipe section (401) is 1/5a-2/5 a.
11. The apparatus according to claim 10, wherein: the bellows flow monitoring device (5) is arranged at a position B in the length direction of the bellows straight pipe section (401), and the distance between the position B and the top of the bellows straight pipe section (401) is 1/4a-1/3 a.
12. The apparatus according to any one of claims 3-5, 7-11, wherein: the device comprises 16-42 bellows (4); and/or
The blowing main pipe (301) is connected with 2-6 blowing branch pipes (302).
13. The apparatus according to claim 12, wherein: the device comprises 20-40 bellows (4); and/or
The blowing main pipe (301) is connected with 3 or 4 blowing branch pipes (302).
14. The apparatus according to claim 12, wherein: the lower part of each blowing pipe row (303) is covered with 1-8 bellows (4).
15. The apparatus according to claim 14, wherein: the lower part of each blowing pipe row (303) is covered with 2-5 bellows (4).
16. The apparatus according to claim 14 or 15, wherein: the number of bellows (4) covered on the lower part of each blowing tube row (303) is the same.
17. The apparatus of any one of claims 3-5, 7-11, 13-15, wherein: each blowing pipe row (303) comprises 2-50 blowing pipes (304); 2-100 blowing holes (305) are arranged on each blowing pipe (304); and/or
The blowing pipe (304) is a blowing sleeve (306) with 2 sections or more than 2 sections, and the blowing sleeve (306) adopts a telescopic sleeve structure.
18. The apparatus according to claim 17, wherein: each blowing pipe row (303) comprises 3-40 blowing pipes (304); 3-50 blowing holes (305) are arranged on each blowing pipe (304); and/or
Each section of the blowing sleeve (306) is provided with a blowing hole (305).
19. The apparatus according to claim 18, wherein: each blowing tube row (303) comprises 5-20 blowing tubes (304).
20. The apparatus according to claim 17, wherein: the opening direction of the blowing hole (305) faces the sintering pallet (1).
21. The apparatus according to claim 4 or 5, wherein: the blowing device further comprises a control system (8); the control system (8) is connected with the bellows flow monitoring device (5), the branch pipe flow monitoring device (601), the branch pipe flow control device (701), the main pipe flow monitoring device (602) and the main pipe flow control device (702), and controls the branch pipe flow control device (701) and the main pipe flow control device (702).
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| CN110345766B (en) * | 2019-07-30 | 2021-07-20 | 中冶长天国际工程有限责任公司 | Hood top wind pressure type anti-escape system for gas injection and control method thereof |
| CN110343852B (en) * | 2019-07-30 | 2021-07-20 | 中冶长天国际工程有限责任公司 | Gas anti-escape system of blowing cover and control method thereof |
| CN113969344B (en) * | 2020-07-23 | 2023-04-28 | 中冶长天国际工程有限责任公司 | Proportioning method of gas-steam coupling injection process of sintering machine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011052859A (en) * | 2009-08-31 | 2011-03-17 | Jfe Steel Corp | Sintering machine |
| JP2011052858A (en) * | 2009-08-31 | 2011-03-17 | Jfe Steel Corp | Sintering machine |
| CN205782910U (en) * | 2016-05-10 | 2016-12-07 | 中冶长天国际工程有限责任公司 | The multiple degrees of freedom formula blowing device of a kind of sintering and sintering equipment |
| CN106440810A (en) * | 2016-11-23 | 2017-02-22 | 西安交通大学 | Sintering machine |
| CN206146196U (en) * | 2016-05-10 | 2017-05-03 | 中冶长天国际工程有限责任公司 | Supplementary sintered ignition heat preservation stove is reinforceed to multistage formula |
-
2017
- 2017-06-29 CN CN201710512440.9A patent/CN108120298B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011052859A (en) * | 2009-08-31 | 2011-03-17 | Jfe Steel Corp | Sintering machine |
| JP2011052858A (en) * | 2009-08-31 | 2011-03-17 | Jfe Steel Corp | Sintering machine |
| CN205782910U (en) * | 2016-05-10 | 2016-12-07 | 中冶长天国际工程有限责任公司 | The multiple degrees of freedom formula blowing device of a kind of sintering and sintering equipment |
| CN206146196U (en) * | 2016-05-10 | 2017-05-03 | 中冶长天国际工程有限责任公司 | Supplementary sintered ignition heat preservation stove is reinforceed to multistage formula |
| CN106440810A (en) * | 2016-11-23 | 2017-02-22 | 西安交通大学 | Sintering machine |
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