CN108120290B - Gas injection device and gas injection method - Google Patents
Gas injection device and gas injection method Download PDFInfo
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- CN108120290B CN108120290B CN201710208835.XA CN201710208835A CN108120290B CN 108120290 B CN108120290 B CN 108120290B CN 201710208835 A CN201710208835 A CN 201710208835A CN 108120290 B CN108120290 B CN 108120290B
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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 gas injection device comprises a sintering machine trolley, a sealing cover and a gas injection device, wherein the gas injection device comprises a gas injection main pipe, a gas injection branch pipe and a gas injection pipe row, the sintering machine trolley is positioned in the sealing cover, the gas injection main pipe is arranged on the outer side of the sealing cover, the gas injection pipe row is arranged above the sintering machine trolley, the gas injection pipe row is positioned in the sealing cover, one end of the gas injection branch pipe is connected with the gas injection main pipe, the other end of the gas injection branch pipe is connected with the gas injection pipe row, the gas injection pipe row comprises a plurality of gas injection pipes, and the gas injection pipes are provided with gas injection holes; the gas injection branch pipe is provided with a gas flow monitoring device. The gas blowing device is also provided with a steam blowing device, and can timely and quickly clean the gas blowing hole by blowing steam if the blocking condition of the gas blowing hole is detected in real time.
Description
Technical Field
The invention relates to a gas blowing device of a sintering machine and a gas blowing method thereof, in particular to a gas blowing device of a sintering machine with a steam blowing device and a sintering process thereof, belonging 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 quantity of fuel and flux, and added with proper quantity of water, and after mixing and pelletizing, the materials are undergone the processes of 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.
Under such a large environment, "sintered charge level gas fuel injection technique" developed by JFE corporation of japan has been developed accordinglyThe principle is that gas fuel which is diluted to be below the lower limit of the combustible concentration is blown above the surface of the sintering material at a certain distance behind an ignition furnace, so that the gas fuel is burnt in a sintering material layer to supply heat, thereby reducing the solid carbon consumption and CO in the production of the sintering ore 2 Discharge amount. Meanwhile, the burning of the gas fuel widens the width of a high-temperature zone of the sinter layer during production, so that the temperature time of the sinter at 1200-1400 ℃ is prolonged, and the strength and the 5-10 mm porosity of the sinter are effectively enhanced. At present, the technology has better energy-saving, emission-reducing and quality-improving effects.
Blowing device structure under the prior art: the blowing device consists of a blowing main pipe, a blowing branch pipe, a blowing pipe row, a fuel gas blowing hole, a blowing cover and a side sealing piece. One end of the blowing main pipe is connected with the gas pipeline in the factory, and the other end of the blowing main pipe is connected with the blowing pipe row through the blowing branch pipe, and the blowing pipe row is positioned in the blowing cover and above the sintering machine trolley. When the gas is produced, the gas enters the injection manifold from the gas pipeline in the factory and then enters the injection branch pipe, finally enters the injection pipe row and is sprayed out through the gas injection holes arranged on the pipe row, the gas is mixed and diluted with air in the injection cover to form mixed gas with the concentration required by design, the mixed gas enters the sintering material layer to assist sintering, and the side sealing piece can effectively ensure that the gas and the mixed gas in the cover can not overflow out of the cover.
Because of the lack of effective means for cleaning or blocking spray holes, the gas injection device in the prior art is often easy to block spray holes by tar in long-term production, thereby causing the following problems:
1. non-uniform blowing: in production, after tar blocks a gas spray hole, if the tar cannot be effectively removed, the gas is not sprayed out of the hole, so that the situation that local no gas exists and the spraying amount of other local gas is increased is caused, the spraying uniformity is seriously influenced, and further, the effect of auxiliary sintering of gas spraying is seriously and negatively influenced;
2. the safety coefficient is reduced: because the tar blocks the gas spray holes, the gas spray quantity at other local positions is increased, and the gas spray quantity at each position point of the gas before being sprayed into the material layer is calculated (the gas is just mixed with the atmosphere in the cover to be diluted to the designed concentration). The increase of the gas quantity at the local position can lead to the rapid rise of the concentration value of the gas at the position, and once the concentration value reaches the lower limit value of the gas explosion range, the explosion is likely to be caused, so that serious production accidents are caused;
3. the spray holes are blocked, and the cleaning is extremely difficult. Because the sintering machine continuously runs and the internal temperature of the sintering machine is higher (generally 400-600 ℃), if the blowing holes are blocked, the sintering machine must be stopped to run, and the blowing holes can be cleaned after the whole device and the sintering ore in the device are cooled, so that the operation of the sintering machine is influenced; meanwhile, if the sintering machine stops running, the operation of the whole working procedure is affected, and equipment such as a cooler and the like are also affected; in addition, if the blowing holes are blocked, the operation of the sintering machine is stopped suddenly, so that the sintering of the sintering ore in the sintering machine is affected, and the product quality is reduced.
Disclosure of Invention
Aiming at the defects of the prior art, the device is optimized and improved on the basis of the structure of the prior blowing device, so as to develop a blocking problem of a gas blowing hole which can be rapidly found in production and can be effectively cleared at the first time, and a flow feedback control method corresponding to the blocking problem is developed, so as to solve the defects of the prior art and achieve the purposes of stable and smooth production of the whole production line. The gas injection device can detect the blocking condition of the gas injection hole in real time, and can clean the gas injection hole timely and rapidly if the blocking occurs.
According to a first embodiment of the present invention, a gas injection device is provided. In particular, a gas injection device having a steam purge device is provided.
A gas injection device comprises a sintering machine trolley, a sealing cover (or referred to as an injection cover) and a gas injection device. The fuel gas injection device comprises a fuel gas injection main pipe, a fuel gas injection branch pipe and a fuel gas injection pipe row. The sintering machine trolley is positioned in the sealing cover. The fuel gas injection header pipe is arranged on the outer side of the sealing cover. The gas injection tube row is arranged above the sintering pallet, and is positioned in the sealing cover. One end of the fuel gas injection branch pipe is connected with the fuel gas injection main pipe, and the other end is connected with the fuel gas injection pipe row. The gas injection tube row comprises a plurality of gas injection tubes. The gas injection pipe is provided with a gas injection hole. The gas injection branch pipe is provided with a gas flow monitoring device.
The gas flow monitoring device is arranged on the gas injection branch pipe, and is used for monitoring the gas flow on the branch pipe in real time, and when the gas flow changes due to the fact that the gas spray hole is blocked by tar, the gas flow monitoring device can rapidly detect the gas flow.
In the invention, the gas injection device further comprises a steam purging device. Namely, the present invention provides a gas injection device having a steam purge device. The steam purging device comprises a steam header pipe, a steam branch pipe and a steam purging pipe row. The steam header pipe is arranged outside the sealing cover. The steam purging pipe row is arranged above the sintering machine trolley, and the steam purging pipe row is arranged between the sintering machine trolley and the gas injection pipe row. One end of the steam branch pipe is connected with the steam main pipe, and the other end is connected with the steam purging pipe row. The steam purge tube bank includes a plurality of steam purge tubes. The steam purging pipe is provided with one or more steam purging holes.
In the invention, the opening direction of the gas blowing holes faces the sintering pallet, and the opening direction of the steam blowing holes faces the gas blowing tube row.
The steam blowing device is arranged above the sintering machine trolley, the steam blowing tube row is arranged between the sintering machine trolley and the gas blowing tube row, when the gas blowing tube row operates normally, the steam blowing device does not operate, when tar blocks the gas spray holes, so that local no gas is caused, the spraying amount of other local gases is increased, when the spraying uniformity is seriously influenced, the steam blowing device is started, high-temperature steam is sprayed out of a plurality of steam blowing tubes of the steam blowing tube row, and substances such as tar in the blocked gas spray holes can be effectively removed. When the opening direction of the gas blowing hole faces the sintering pallet, and the opening direction of the steam blowing hole faces the gas blowing pipe row, the steam blowing efficiency is higher, and the influence caused by the fact that steam is directly blown to the material surface of the sintering pallet is avoided.
Preferably, the gas injection header pipe and the steam header pipe are respectively arranged at two sides of the sintering pallet.
In the invention, a steam purging pipe is arranged under each gas blowing pipe.
Preferably, one steam purge hole on the steam purge pipe corresponds to one or more (e.g., 2 or 3) gas purge holes of the upper gas purge pipe (i.e., steam ejected from one steam purge hole can be purged to the one or more gas purge holes); more preferably, the number of downwardly directed gas injection holes of the gas injection pipe is equal or substantially equal to the number of upwardly directed steam purge holes of the steam purge pipe directly below the gas injection pipe and each gas injection hole is aligned or one-to-one with a respective one of the steam purge holes of the lower steam purge pipe (i.e. steam injected by one steam purge hole is able to purge to said corresponding one of the gas injection holes).
As an optimal scheme, each steam blowing hole on the steam blowing pipe corresponds to each gas blowing hole on the gas blowing pipe, and the steam blowing holes are positioned right below the corresponding gas blowing holes. The device can directly and rapidly remove tar and other substances in the gas injection hole by high-temperature steam, so that the problem of blockage of the gas injection hole is rapidly solved, the influence time of uneven gas injection caused by blockage of the gas injection hole on the sintering process is shortened, and the whole sintering process is stably completed.
Preferably, the gas flow monitoring device is a flow orifice plate.
The flow orifice plate, also called orifice plate flowmeter, is matched with a standard orifice plate and a multi-parameter differential pressure transmitter (or differential pressure transmitter, temperature transmitter and pressure transmitter) to form a differential pressure flow device, can measure the flow of gas, steam and liquid, and has simple structure, convenient maintenance and stable performance.
Preferably, the steam branch pipe is provided with a steam pipeline valve.
By opening or closing the steam pipe valve, the steam is controlled to flow into or not flow into the steam branch pipe. When steam is required to purge the gas injection hole, a steam pipeline valve is opened; after the purging is completed, the steam pipeline valve is closed.
In the present invention, the gas injection pipe is a gas injection sleeve of 2 or more (for example, 3 or 4). The fuel gas injection sleeve adopts a telescopic sleeve structure.
It is preferable that each section of the gas injection sleeve is provided with a gas injection hole. 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.
The outer (diameter) diameter of the steam purge tube having the steam purge holes is generally 20 to 150mm, preferably 30 to 130mm, preferably 35 to 110mm, preferably 40 to 90mm, more preferably 45 to 70mm, more preferably 50 or 60mm.
The distance between the gas injection pipe or the gas injection sleeve and the steam purge pipe (referred to as the distance between the upper and lower sides or the distance in the vertical direction) is generally 30 to 200mm, preferably 32 to 190mm, preferably 35 to 170mm, preferably 40 to 150mm, more preferably 45 to 120mm, more preferably 50 or 60 or 70 or 80mm.
In the invention, the gas injection main pipe is provided with 1-10 gas injection branch pipes, preferably 2-8 gas injection branch pipes, and each gas injection branch pipe is provided with a gas flow monitoring device.
Preferably, the number of the steam branch pipes is the same as the number of the gas injection branch pipes.
In the invention, 2-50 gas injection pipes, preferably 3-20 gas injection pipes, are arranged or connected on each gas injection pipe row.
In the invention, 2-100 gas injection holes, preferably 3-50 gas injection holes, are arranged on each gas injection pipe.
In the invention, the gas injection device further comprises a control system. The control system is connected with the gas flow monitoring device and controls the steam pipeline valve.
The control system is connected with the gas flow monitoring device and the steam pipeline valve, and monitoring data of the gas flow monitoring device are obtained in real time. When the monitoring data of the gas flow monitoring device exceeds a set threshold value, the control system automatically opens a steam pipeline valve, steam flows into the steam branch pipe, is sprayed out of the steam blowing holes of the steam blowing pipe, and is blown onto the gas blowing holes, so that the blocking substances such as tar and the like are clear. The whole process can be automatically operated by the control system without manual operation, and under the conditions of no shutdown and no cooling, the substances blocked on the gas injection holes are quickly and clearly cleared, so that the normal operation of the whole sintering process is ensured, the influence on the sintering of the sintering ore in the sintering machine is avoided, and the stability of the product quality is ensured. According to a second embodiment of the present invention, a gas injection method is provided.
A gas blowing method or a gas blowing method using the above gas blowing apparatus, the method comprising the steps of:
1) The whole device starts to operate, a variable controllable value k is set, the gas flow value W on the gas flow monitoring device on each gas injection branch pipe is detected respectively, and the gas flow value meter on the gas flow monitoring device on the nth gas injection branch pipe is W n ；
2) The gas flow value W' of the gas flow monitoring device on each gas injection branch pipe is respectively monitored in real time, and the real-time gas flow value W of the gas flow monitoring device on the nth gas injection branch pipe is measured in real time n ’；
3) The control system calculates the gas flow rate delta in each gas injection branch pipe, and the gas flow rate delta on the nth gas injection branch pipe is as follows
4) The gas flow rate delta on each gas injection branch pipe is respectively compared n And the magnitude of k:
if delta n When the value is smaller than the k value, the blocking condition of the gas injection hole on the gas injection pipe connected with the nth gas injection branch pipe is controllable, the operation is continued, and the gas flow monitoring device is continuously monitored;
if delta n The value of k is equal to or greater than the value of k, which indicates that the gas injection holes on the gas injection pipes connected with the nth gas injection branch pipe are seriously blocked by a control systemOpening a steam pipeline valve on a steam branch pipe corresponding to the gas blowing branch pipe, blowing out steam from the steam blowing hole, and leading the steam to enter the gas blowing hole to dredge the gas blowing hole and continue to operate;
wherein: n is an integer from 1 to 10, preferably an integer from 2 to 8.
In the above method, the k value is 0.1 to 0.5, preferably 0.2 to 0.4, more preferably 0.25 to 0.35.
In the above method, the control system opens the steam pipe valve for 2 to 20 minutes and closes the steam pipe valve, preferably for 3 to 10 minutes and more preferably for 4 to 8 minutes.
The opening and closing of the steam pipeline are controlled by a control system, and according to the difference of data monitored by the gas flow monitoring device in real time, a steam pipeline valve is opened, and steam is introduced for purging. When each gas injection branch pipe is provided with a gas flow monitoring device and each steam branch pipe is provided with a steam pipeline valve, the control system can respectively compare the gas flow change rate delta on each gas injection branch pipe n And the valve of the steam pipeline on the steam branch pipe corresponding to the gas injection branch pipe is selectively opened to realize accurate purging, so that the influence of steam on sintering is reduced while the blockage is rapidly solved.
When the invention is used for production, the blockage of the gas injection hole can be detected at the first time and can be effectively removed, so that the situations of no gas at the local position and multiple gas at the local position are avoided, and the situations of product quality reduction caused by uneven gas injection and safety accidents caused by excessive gas at the local position reaching the lower limit of explosion concentration are effectively avoided.
In summary, compared with the prior art, the technology has the advantages of higher fault tolerance, better quality improvement effect, higher safety coefficient and no excessive cost. It is expected to have great development potential in future markets.
Drawings
FIG. 1 is a schematic diagram of a fuel gas injection device according to the present invention;
FIG. 2 is a top view of a fuel gas injection apparatus according to the present invention;
FIG. 3 is a schematic view of a fuel gas injection pipe of the present invention with 3 fuel gas injection sleeves;
FIG. 4 is a schematic diagram of a control system according to the present invention;
fig. 5 is a flow chart of a gas injection method according to the present invention.
Reference numerals: 1: sintering machine trolley; 2: a sealing cover; 3: a fuel gas injection device; 301: a fuel gas injection header pipe; 302: a fuel gas injection branch pipe; 303: a gas injection tube row; 304: a gas injection pipe; 305: a fuel gas injection hole; 306: (multi-section telescopic) gas injection sleeve; 4: a gas flow monitoring device; 5: a steam purge device; 501: a steam header pipe; 502: a steam branch pipe; 503: a steam purge tube bank; 504: a steam purge tube; 505: a steam purge hole; 6: a steam conduit valve; 7: and a control system.
Detailed Description
According to a first embodiment of the present invention, a gas injection device is provided.
The device comprises a sintering pallet 1, a sealing cover 2 and a gas blowing device 3. The gas injection device 3 includes a gas injection header 301, a gas injection branch 302, and a gas injection tube row 303. The sintering pallet 1 is positioned in the sealing cover 2. The fuel gas injection manifold 301 is disposed outside the sealing cap 2. The gas injection tube row 303 is disposed above the sintering pallet 1, and the gas injection tube row 303 is located in the seal cover 2. The fuel gas injection branch pipe 302 has one end connected to the fuel gas injection header 301 and the other end connected to the fuel gas injection pipe row 303. The gas injection tube row 303 includes a plurality of gas injection tubes 304. The gas injection pipe 304 is provided with a gas injection hole 305. The gas flow monitoring device 4 is provided on the gas injection branch pipe 302.
Preferably, the apparatus further comprises a steam purge means 5. That is, the present invention provides a gas injection device having a steam purge device 5. The steam purge device 5 includes a steam header 501, a steam branch 502, and a steam purge tube row 503. The steam header 501 is provided outside the sealing cap 2. The steam purge tube row 503 is disposed above the sintering pallet 1, and the steam purge tube row 503 is disposed between the sintering pallet 1 and the gas injection tube row 303. One end of the steam manifold 502 is connected to the steam header 501 and the other end is connected to the steam purge tube bank 503. The steam purge tube bank 503 includes a plurality of steam purge tubes 504. The steam purge pipe 504 is provided with steam purge hole(s) 505.
In the present invention, the opening direction of the gas injection hole 305 is directed toward the sintering pallet 1. The opening direction of the steam purge holes 505 is toward the gas injection tube row 303.
Preferably, the gas injection header 301 and the steam header 501 are provided on both sides of the sintering pallet 1, respectively.
In the present invention, a steam purge pipe 504 is provided directly below each gas injection pipe 304.
Preferably, one steam purge hole 505 on the steam purge pipe 504 corresponds to one or more (e.g., 2 or 3) gas purge holes 305 of the upper gas purge pipe 304 (i.e., steam ejected from one steam purge hole 505 is able to purge to the one or more gas purge holes 305); more preferably, the number of downwardly facing gas injection holes 305 of the gas injection pipe 304 is equal or substantially equal to the number of upwardly facing steam purge holes 505 of the steam purge pipe 504 directly below the gas injection pipe 304 and each gas injection hole 305 is aligned with a corresponding one of the steam purge holes 505 of the lower steam purge pipe 504 (i.e. steam injected from one steam purge hole 505 is able to purge to the corresponding one of the gas injection holes 305).
In the present invention, the gas flow monitoring device 4 is a flow orifice plate.
Preferably, the steam manifold 502 is provided with a steam pipe valve 6.
In the present invention, the gas injection pipe 304 is a gas injection sleeve 306 of 2 or more. The fuel injection sleeve 306 is of a telescoping sleeve construction.
It is preferable that each section of the gas injection sleeve 306 is provided with a gas injection hole 305.
In the invention, 1-10 gas injection branch pipes 302, preferably 2-8 gas injection branch pipes 302, are arranged on the gas injection header 301, and a gas flow monitoring device 4 is arranged on each gas injection branch pipe 302.
Preferably, the number of steam manifold 502 is the same as the number of gas injection manifold 302.
In the present invention, 2 to 50 gas injection pipes 304, preferably 3 to 20 gas injection pipes 304, are provided or connected to each gas injection pipe row 303.
In the present invention, 2 to 100 gas injection holes 305, preferably 3 to 50 gas injection holes 305, are provided in each gas injection pipe 304.
Preferably, the device further comprises a control system 7. A control system 7 is connected to the gas flow monitoring device 4 and controls the steam conduit valve 6.
The outer (straight) diameter of the gas injection pipe 304 or the gas injection sleeve 306 having the gas injection holes 305 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.
The outer (diameter) diameter of the steam purge pipe 504 having the steam purge holes 505 is generally 20 to 150mm, preferably 30 to 130mm, preferably 35 to 110mm, preferably 40 to 90mm, more preferably 45 to 70mm, more preferably 50 or 60mm.
The distance between the gas injection lance 304 or the gas injection lance 306 and the steam purge pipe 504 (referred to as the distance between the top and bottom or the distance in the vertical direction) is generally 30-200mm, preferably 32-190mm, preferably 35-170mm, preferably 40-150mm, more preferably 45-120mm, more preferably 50 or 60 or 70 or 80mm.
According to a second embodiment of the present invention, a gas injection method is provided.
A gas injection method (or, a gas injection and cleaning method), the method comprising the steps of:
1) The whole device starts to operate, a variable controllable value k is set, the gas flow value W on the gas flow monitoring device 4 on each gas injection branch pipe 302 is detected, and the gas flow value W on the gas flow monitoring device 4 on the nth gas injection branch pipe 302 is detected n ；
2) Monitoring in real time the gas flow monitoring device 4 on each gas injection branch 302Gas flow value W' real-time gas flow value W on the gas flow monitoring device 4 on the nth gas injection branch pipe 302 n ’；
3) The control system 7 calculates the gas flow rate delta in each gas injection branch pipe 302, and the gas flow rate on the nth gas injection branch pipe 302 is
4) The gas flow rate change delta on each of the gas injection branches 302 is compared separately n And the magnitude of k:
if delta n When the value is smaller than the k value, the blocking condition of the gas injection holes 305 on the gas injection pipes 304 connected with the nth gas injection branch pipe 302 is controllable, the operation is continued, and the gas flow monitoring device 4 continues to monitor;
if delta n When the k value is equal to or greater than the k value, the gas injection holes 305 on the gas injection pipes 304 connected with the nth gas injection branch pipe 302 are seriously blocked, the steam pipeline valves 6 on the steam branch pipes 502 corresponding to the gas injection branch pipe 302 are opened through the control system 7, steam is blown out from the steam blowing holes 505, and the steam enters the gas injection holes 305 to dredge the gas injection holes 305 and continuously run;
wherein: n is an integer from 1 to 10, preferably an integer from 2 to 8.
In the present invention, the k value is 0.1 to 0.5, preferably 0.2 to 0.4, more preferably 0.25 to 0.35.
The control system 7 opens the steam line valve 62-20 minutes later closes the steam line valve 6, preferably 3-10 minutes later closes the steam line valve 6, more preferably 4-8 minutes later closes the steam line valve 6.
Example 1
According to fig. 1-5, a gas injection device comprises a sintering pallet 1, a sealing cover 2 and a gas injection device 3, wherein the gas injection device 3 comprises a gas injection main pipe 301, a gas injection branch pipe 302 and a gas injection pipe row 303, the sintering pallet 1 is positioned in the sealing cover 2, the gas injection main pipe 301 is arranged on the outer side of the sealing cover 2, the gas injection pipe row 303 is arranged above the sintering pallet 1, the gas injection pipe row 303 is positioned in the sealing cover 2, one end of the gas injection branch pipe 302 is connected with the gas injection main pipe 301, the other end of the gas injection branch pipe 302 is connected with the gas injection pipe row 303, the gas injection pipe row 303 comprises a plurality of gas injection pipes 304, and the gas injection pipes 304 are provided with gas injection holes 305; the gas flow monitoring device 4 is provided on the gas injection branch pipe 302. The gas flow monitoring device 4 is a flow orifice plate.
Still include steam purge device 5, steam purge device 5 includes steam header 501, steam branch pipe 502, steam purge tube row 503, steam header 501 sets up in the outside of sealed cowling 2, steam purge tube row 503 sets up the top at sintering pallet 1, and steam purge tube row 503 sets up between sintering pallet 1 and gas injection tube row 303, steam header 501 is connected to steam branch pipe 502's one end and steam purge tube row 503 is connected to the other end, steam purge tube row 503 includes many steam purge tubes 504, be equipped with steam purge hole 505 on the steam purge tube 504. The steam manifold 502 is provided with a steam pipe valve 6.
The gas injection header 301 and the steam header 501 are provided on both sides of the sintering pallet 1, respectively. The opening direction of the gas injection holes 305 is toward the sintering pallet 1, and the opening direction of the steam purge holes 505 is toward the gas injection tube row 303. A steam purge pipe 504 is provided directly below each gas injection pipe 304. One steam purge hole 505 on the steam purge pipe 504 corresponds to 2 gas purge holes 305 of the upper gas purge pipe 304 (i.e., steam injected from one steam purge hole 505 can purge to the 2 gas purge holes 305).
The gas injection pipe 304 is a gas injection sleeve 306 with 2 or more sections, and the gas injection sleeve 306 adopts a telescopic sleeve structure. Each section of the fuel injection sleeve 306 is provided with a fuel injection hole 305.
The gas injection header 301 is provided with 3 gas injection branch pipes 302, and each gas injection branch pipe 302 is provided with a gas flow monitoring device 4. The number of steam manifold 502 is the same as the number of gas injection manifold 302.
Each gas injection tube row 303 is provided with or connected with 3 gas injection tubes 304. Each gas injection pipe 304 is provided with 5 gas injection holes 305.
The gas injection device further comprises a control system 7, the control system 7 being connected to the gas flow monitoring device 4 and controlling the steam conduit valve 6.
A gas blowing method or a gas blowing method using the above gas blowing apparatus, the method comprising the steps of:
1) The whole device starts to operate, a variable controllable value k is set, the gas flow value W on the gas flow monitoring device 4 on each gas injection branch pipe 302 is detected, and the gas flow value W on the gas flow monitoring device 4 on the nth gas injection branch pipe 302 is detected n ；
2) The gas flow value W' on the gas flow monitoring device 4 on each gas injection branch 302 is monitored in real time, and the real-time gas flow value W on the gas flow monitoring device 4 on the nth gas injection branch 302 is monitored in real time n ’；
3) The control system 7 calculates the gas flow rate delta in each gas injection branch pipe 302, and the gas flow rate on the nth gas injection branch pipe 302 is
4) The gas flow rate change delta on each of the gas injection branches 302 is compared separately n And the magnitude of k:
if delta n When the value is smaller than the k value, the blocking condition of the gas injection holes 305 on the gas injection pipes 304 connected with the nth gas injection branch pipe 302 is controllable, the operation is continued, and the gas flow monitoring device 4 continues to monitor;
if delta n When the k value is equal to or greater than the k value, the gas injection holes 305 on the gas injection pipes 304 connected with the nth gas injection branch pipe 302 are seriously blocked, the steam pipeline valves 6 on the steam branch pipes 502 corresponding to the gas injection branch pipe 302 are opened through the control system 7, steam is blown out from the steam blowing holes 505, and the steam enters the gas injection holes 305 to dredge the gas injection holes 305 and continuously run;
wherein: n is 3.
In the above method, the k value is 0.25.
In the above method, the control system 7 opens the steam pipe valve for 64 minutes and closes the steam pipe valve 6.
In this embodiment, the blockage of the gas injection hole can be detected and effectively cleared at the first time, so that the situations of no gas at the local position and multiple gas at the local position are avoided, and the situations of product quality degradation caused by uneven gas injection and safety accidents caused by excessive gas at the local position reaching the lower limit of the explosion concentration are effectively avoided.
Example 2
1-2 and 4-5, a gas injection device comprises a sintering pallet 1, a sealing cover 2 and a gas injection device 3, wherein the gas injection device 3 comprises a gas injection main pipe 301, a gas injection branch pipe 302 and a gas injection pipe row 303, the sintering pallet 1 is positioned in the sealing cover 2, the gas injection main pipe 301 is arranged on the outer side of the sealing cover 2, the gas injection pipe row 303 is arranged above the sintering pallet 1, the gas injection pipe row 303 is positioned in the sealing cover 2, one end of the gas injection branch pipe 302 is connected with the gas injection main pipe 301, the other end of the gas injection branch pipe 302 is connected with the gas injection pipe row 303, the gas injection pipe row 303 comprises a plurality of gas injection pipes 304, and the gas injection pipes 304 are provided with gas injection holes 305; the gas flow monitoring device 4 is provided on the gas injection branch pipe 302. The gas flow monitoring device 4 is a flow orifice plate.
Still include steam purge device 5, steam purge device 5 includes steam header 501, steam branch pipe 502, steam purge tube row 503, steam header 501 sets up in the outside of sealed cowling 2, steam purge tube row 503 sets up the top at sintering pallet 1, and steam purge tube row 503 sets up between sintering pallet 1 and gas injection tube row 303, steam header 501 is connected to steam branch pipe 502's one end and steam purge tube row 503 is connected to the other end, steam purge tube row 503 includes many steam purge tubes 504, be equipped with steam purge hole 505 on the steam purge tube 504. The steam manifold 502 is provided with a steam pipe valve 6.
The gas injection header 301 and the steam header 501 are provided on both sides of the sintering pallet 1, respectively. The opening direction of the gas injection holes 305 is toward the sintering pallet 1, and the opening direction of the steam purge holes 505 is toward the gas injection tube row 303. A steam purge pipe 504 is provided directly below each gas injection pipe 304. The number of downwardly facing gas injection holes 305 of the gas injection pipe 304 is equal to the number of upwardly facing steam purge holes 505 of the steam purge pipe 504 directly below the gas injection pipe 304 and each gas injection hole 305 is aligned with a respective one of the steam purge holes 505 of the lower steam purge pipe 504 (i.e. steam injected from one steam purge hole 505 is able to purge to the corresponding one of the gas injection holes 305).
The gas injection header 301 is provided with 8 gas injection branch pipes 302, and each gas injection branch pipe 302 is provided with a gas flow monitoring device 4. The number of steam manifold 502 is the same as the number of gas injection manifold 302. Each gas injection tube row 303 is provided with or connected with 20 gas injection tubes 304. Each gas injection pipe 304 is provided with 50 gas injection holes 305.
The gas injection device further comprises a control system 7, the control system 7 being connected to the gas flow monitoring device 4 and controlling the steam conduit valve 6.
A gas blowing method or a gas blowing method using the above gas blowing apparatus, the method comprising the steps of:
1) The whole device starts to operate, a variable controllable value k is set, the gas flow value W on the gas flow monitoring device 4 on each gas injection branch pipe 302 is detected, and the gas flow value W on the gas flow monitoring device 4 on the nth gas injection branch pipe 302 is detected n ；
2) The gas flow value W' on the gas flow monitoring device 4 on each gas injection branch 302 is monitored in real time, and the real-time gas flow value W on the gas flow monitoring device 4 on the nth gas injection branch 302 is monitored in real time n ’；
3) The control system 7 calculates the gas flow rate delta in each gas injection branch pipe 302, and the gas flow rate on the nth gas injection branch pipe 302 is
4) The gas flow rate change delta on each of the gas injection branches 302 is compared separately n And the magnitude of k:
if delta n When the value is smaller than the k value, the blocking condition of the gas injection holes 305 on the gas injection pipes 304 connected with the nth gas injection branch pipe 302 is controllable, the operation is continued, and the gas flow monitoring device 4 continues to monitor;
if delta n When the k value is equal to or greater than the k value, the gas injection holes 305 on the gas injection pipes 304 connected with the nth gas injection branch pipe 302 are seriously blocked, the steam pipeline valves 6 on the steam branch pipes 502 corresponding to the gas injection branch pipe 302 are opened through the control system 7, steam is blown out from the steam blowing holes 505, and the steam enters the gas injection holes 305 to dredge the gas injection holes 305 and continuously run;
wherein: n is 8.
In the above method, the k value is 0.35.
In the above method, the control system 7 opens the steam pipe valve for 68 minutes and closes the steam pipe valve 6.
In this embodiment, the blockage of the gas injection hole can be detected and effectively cleared at the first time, so that the situations of no gas at the local position and multiple gas at the local position are avoided, and the situations of product quality degradation caused by uneven gas injection and safety accidents caused by excessive gas at the local position reaching the lower limit of the explosion concentration are effectively avoided.
Claims (21)
1. The utility model provides a gas jetting device, the device includes sintering pallet (1), sealed cowling (2), gas injection house steward (301), gas injection branch pipe (302), gas injection tube bank (303), sintering pallet (1) is located sealed cowling (2), gas injection house steward (301) set up in the outside of sealed cowling (2), gas injection tube bank (303) set up in the top of sintering pallet (1), and gas injection tube bank (303) are located sealed cowling (2), gas injection branch pipe (302) one end is connected gas injection house steward (301) and the other end is connected gas injection tube bank (303), gas injection tube bank (303) are including many gas injection tubes (304), be equipped with a plurality of gas injection holes (305) on gas injection tube (304); the method is characterized in that: the gas injection branch pipe (302) is provided with a gas flow monitoring device (4);
the device further comprises a steam blowing device (5), the steam blowing device (5) comprises a steam main pipe (501), a steam branch pipe (502) and a steam blowing pipe row (503), the steam main pipe (501) is arranged on the outer side of the sealing cover (2), the steam blowing pipe row (503) is arranged above the sintering machine trolley (1), the steam blowing pipe row (503) is arranged between the sintering machine trolley (1) and the fuel gas blowing pipe row (303), one end of the steam branch pipe (502) is connected with the steam main pipe (501) and the other end of the steam branch pipe is connected with the steam blowing pipe row (503), the steam blowing pipe row (503) comprises a plurality of steam blowing pipes (504), and a plurality of steam blowing holes (505) are formed in the steam blowing pipes (504);
the opening direction of the gas injection hole (305) faces the sintering pallet (1), and the opening direction of the steam purge hole (505) faces the gas injection hole (305) of the gas injection pipe row (303).
2. The gas injection apparatus of claim 1, wherein: the fuel gas injection header pipe (301) and the steam header pipe (501) are respectively arranged at two sides of the sintering pallet (1).
3. The gas injection device according to claim 1 or 2, characterized in that: a steam purging pipe (504) is arranged under each gas injection pipe (304).
4. A gas injection apparatus as claimed in claim 3, wherein: a steam purge hole (505) in the steam purge pipe (504) corresponds to one or more gas injection holes (305) of the upper gas injection pipe (304).
5. The gas injection apparatus of claim 4, wherein: the number of downward-facing gas injection holes (305) of the gas injection pipe (304) is equal to the number of upward-facing steam purge holes (505) of the steam purge pipe (504) directly below the gas injection pipe (304) and each gas injection hole (305) is aligned with a corresponding one of the steam purge holes (505) below, i.e. steam injected from one of the steam purge holes (505) is able to purge to the corresponding one of the gas injection holes (305).
6. The gas injection device according to any one of claims 1-2 and 4-5, wherein: the gas flow monitoring device (4) is a flow orifice plate; and/or
The steam branch pipe (502) is provided with a steam pipeline valve (6).
7. A gas injection apparatus as claimed in claim 3, wherein: the gas flow monitoring device (4) is a flow orifice plate; and/or
The steam branch pipe (502) is provided with a steam pipeline valve (6).
8. The gas injection device according to any one of claims 1-2, 4-5, 7, wherein: the gas injection pipe (304) is a gas injection sleeve (306) with more than 2 sections, and the gas injection sleeve (306) adopts a telescopic sleeve structure; each section of the fuel gas injection sleeve (306) is provided with a fuel gas injection hole (305); and/or
1-10 gas injection branch pipes (302) are arranged on the gas injection header pipe (301), and a gas flow monitoring device (4) is arranged on each gas injection branch pipe (302); the number of steam branch pipes (502) is the same as the number of gas injection branch pipes (302).
9. A gas injection apparatus as claimed in claim 3, wherein: the gas injection pipe (304) is a gas injection sleeve (306) with more than 2 sections, and the gas injection sleeve (306) adopts a telescopic sleeve structure; each section of the fuel gas injection sleeve (306) is provided with a fuel gas injection hole (305); and/or
1-10 gas injection branch pipes (302) are arranged on the gas injection header pipe (301), and a gas flow monitoring device (4) is arranged on each gas injection branch pipe (302); the number of steam branch pipes (502) is the same as the number of gas injection branch pipes (302).
10. The gas injection apparatus of claim 8, wherein: 2-8 gas injection branch pipes (302) are arranged on the gas injection header pipe (301).
11. The gas injection apparatus of claim 9, wherein: 2-8 gas injection branch pipes (302) are arranged on the gas injection header pipe (301).
12. The gas injection device according to any one of claims 1-2, 4-5, 7, 9-11, wherein: 2-50 gas injection pipes (304) are arranged or connected on each gas injection pipe row (303); and/or
2-100 gas injection holes (305) are arranged on each gas injection pipe (304).
13. A gas injection apparatus as claimed in claim 3, wherein: 2-50 gas injection pipes (304) are arranged or connected on each gas injection pipe row (303); and/or
2-100 gas injection holes (305) are arranged on each gas injection pipe (304).
14. The gas injection apparatus of claim 12, wherein: 3-20 gas injection pipes (304) are arranged or connected on each gas injection pipe row (303); and/or
Each gas injection pipe (304) is provided with 3-50 gas injection holes (305).
15. The gas injection apparatus of claim 13, wherein: 3-20 gas injection pipes (304) are arranged or connected on each gas injection pipe row (303); and/or
Each gas injection pipe (304) is provided with 3-50 gas injection holes (305).
16. The gas injection device according to any one of claims 1-2, 4-5, 7, 9-11, 13-15, wherein: the device also comprises a control system (7), wherein the control system (7) is connected with the gas flow monitoring device (4) and controls the steam pipeline valve (6).
17. A gas blowing method using a gas blowing apparatus according to any one of claims 1 to 16, the method comprising the steps of:
1) The whole device starts to operate, a variable controllable value k is set, the gas flow value W on the gas flow monitoring device (4) on each gas injection branch pipe (302) is detected respectively, and the gas flow value W on the gas flow monitoring device (4) on the nth gas injection branch pipe (302) is detected as W n ；
2) The gas flow value W' on the gas flow monitoring device (4) on each gas injection branch pipe (302) is respectively monitored in real time, and the real-time gas flow value W on the gas flow monitoring device (4) on the nth gas injection branch pipe (302) is measured n ’；
3) The control system (7) calculates the gas flow rate delta in each gas injection branch pipe (302), and the gas flow rate delta on the nth gas injection branch pipe (302) is as follows
4) The gas flow rate delta on each gas injection branch pipe (302) is compared respectively n And the magnitude of k:
if delta n When the value is smaller than the k value, the blocking condition of a gas injection hole (305) on a gas injection pipe (304) connected with an nth gas injection branch pipe (302) is controllable, the operation is continued, and a gas flow monitoring device (4) is continuously monitored;
if delta n When the k value is equal to or greater than the k value, the gas injection hole (305) on the gas injection pipe (304) connected with the nth gas injection branch pipe (302) is seriously blocked, a steam pipeline valve (6) on a steam branch pipe (502) corresponding to the gas injection branch pipe (302) is opened through a control system (7), steam is blown out from a steam blowing hole (505), the steam enters the gas injection hole (305), and the gas injection hole (305) is dredged and continuously operated;
wherein: n is an integer of 1 to 10.
18. The method according to claim 17, wherein: n is an integer of 2 to 8.
19. The method according to claim 17 or 18, characterized in that: the k value is 0.1-0.5; and/or
The control system (7) opens the steam pipeline valve (6) and closes the steam pipeline valve (6) after 2-20 minutes.
20. The method according to claim 19, wherein: the k value is 0.2-0.4; and/or
The control system (7) opens the steam pipeline valve (6) and closes the steam pipeline valve (6) after 3-10 minutes.
21. The method according to claim 20, wherein: the k value is 0.25-0.35; and/or
The control system (7) opens the steam pipeline valve (6) and closes the steam pipeline valve (6) after 4-8 minutes.
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| CN112393598B (en) * | 2020-04-27 | 2022-06-07 | 中冶长天国际工程有限责任公司 | Spray cooling type gas injection sintering machine 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 |
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