CN216473396U - Low-carbon sintering system - Google Patents
Low-carbon sintering system Download PDFInfo
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- CN216473396U CN216473396U CN202121752580.1U CN202121752580U CN216473396U CN 216473396 U CN216473396 U CN 216473396U CN 202121752580 U CN202121752580 U CN 202121752580U CN 216473396 U CN216473396 U CN 216473396U
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Abstract
The utility model relates to a low-carbon sintering system, belongs to the field of low-carbon metallurgy in metallurgical industry, and solves the problems of high energy consumption, carbon emission amplification, more pollutant emission and the like of the conventional sintering process. The utility model provides a low-carbon sintering system, which comprises an air source system, a hot blast stove system and a sintering system which are sequentially connected through pipelines; the air source system comprises a normal-temperature air, medium-temperature air or/and flue gas supply unit, and air from the air source system enters the hot blast stove system; the hot blast stove system provides high-temperature hot air for sintering for the sintering system. The utility model can reduce the sintering carbon blending amount and has the advantages of low energy consumption, low carbon and environmental protection.
Description
Technical Field
The utility model belongs to the field of low-carbon green metallurgy in the sintering process of metallurgical industry, and particularly relates to a low-carbon sintering system.
Background
The sintering in the metallurgical process is to contain various powdersThe iron material is mixed with proper amount of fuel and flux, and proper amount of water is added, after mixing and pelletizing, the material is made to produce a series of physical and chemical changes in sintering equipment, and the mineral powder grains are adhered into blocks. The fuel blending amount (coke powder and coal powder) in the common sintering raw material is 4 percent, and the CO of each ton of sintering ore2The discharge amount is about 130 kg; producing a large amount of SO during simultaneous sintering2、NOxThe main source of the pollutants is fuel, so that the emission of the pollutants can be effectively reduced by reducing the amount of coke powder and coal powder added in the sintering production, and the CO in the sintering process is reducedxAnd (4) discharging.
The existing sintering system generally adopts normal temperature air to provide oxygen for combustion of carbon fuel in ore blending, and also utilizes circulation of partial sintering hot flue gas, and utilizes waste heat in the flue gas to perform hot air sintering, and the temperature of the circulating flue gas is generally lower than 200 ℃, although the effect of reducing sintering carbon blending quantity can be achieved, the total pollutant emission reduction amount is limited. Meanwhile, the hot air adopts circulating flue gas, and the oxygen content of the circulating flue gas is lower than that of air, so that the sintering process is influenced to a certain extent.
CN112831652A discloses a carbon-free sintering system using high air temperature to provide heat, which provides heat for a sintering machine through a flue gas furnace, feeds coke oven gas and air in a certain proportion into the flue gas furnace, and forms high temperature gas through combustion, wherein the main component of the high temperature gas is CO2And H2O, very low oxygen content. Although the high-temperature gas only provides heat for the sintering process and does not participate in the chemical reaction of the sintering process, the actual application range is small, most of sintering ores need carbon as a reducing agent, and the carbon reducing agent cannot play a role in a low-oxygen environment, so that the sintering effect is greatly influenced.
The existing hot air sintering system has very limited carbon reduction in the sintering process, and can not greatly reduce the sintering carbon distribution and the discharge amount of sintering pollutants.
SUMMERY OF THE UTILITY MODEL
In view of the above analysis, the present invention provides a low-carbon sintering system, which aims to provide high-temperature hot air for sintering by using a hot-blast stove, wherein the air source system comprises a normal-temperature air, medium-temperature air or/and flue gas supply unit, air from the air source system enters the hot-blast stove system, sensible heat of the high-temperature hot air can greatly replace heat released by combustion of carbon-containing fuel in a sintering raw material, so as to realize low-carbon/ultra-low-carbon sintering, and the sintering system is provided with an oxygen supply system, thereby solving the technical problems of low oxygen content, high coke/coal powder consumption, high pollutant emission and the like of the existing sintering system.
In order to solve the problems, the technical scheme adopted by the utility model is as follows:
the utility model discloses a low-carbon sintering system which comprises an air source system, a hot blast stove system and a sintering system which are sequentially connected through pipelines;
the air source system comprises a normal-temperature air, medium-temperature air or/and flue gas supply unit, and air from the air source system enters the hot blast stove system;
the hot blast stove system provides high-temperature hot air for sintering for the sintering machine system.
Furthermore, the hot blast stove system consists of more than two groups of heat accumulating type hot blast stoves, and the adopted fuel is one or more than two of methane, hydrogen and coal gas.
Further, the sintering machine system comprises a sintering machine and a hot air hood arranged above the sintering machine; the hot air cover is connected with a hot air furnace system through a hot air pipeline, and high-temperature hot air is conveyed to the charge level of the sintering machine through the hot air cover.
Furthermore, the low-carbon sintering system further comprises an oxygen supply system, the oxygen supply system is connected with the hot air pipeline, and the oxygen supply amount of the oxygen supply system is adjustable.
Further, the low-carbon sintering machine system further comprises a gas system, the hot air hood is connected with the gas system, the gas system provides secondary temperature compensation for the sintering machine, and the gas introduction amount of the gas system is adjustable.
Furthermore, the interior of the hot air cover is provided with a refractory material, two ends of the hot air cover are sealed, and the interior of the hot air cover is divided into a plurality of disconnected sections.
Further, the low-carbon sintering system further comprises a flue gas treatment system, wherein a gas inlet of the flue gas treatment system is connected with a flue gas pipe below the sintering machine, and a gas outlet of the flue gas treatment system is connected with a gas inlet of the hot blast stove and serves as a flue gas supply unit.
Furthermore, the low-carbon sintering system further comprises a sinter cooling system, wherein normal-temperature air is introduced into an air inlet of the sinter cooling system, and an air outlet of the sinter cooling system is connected with an air inlet of the hot blast stove and serves as a medium-temperature air supply unit.
Furthermore, a cold air supply system for conveying normal-temperature air is adopted as the normal-temperature air supply unit, and the cold air supply system is simultaneously connected with a combustion device of the hot blast stove and a heat accumulator device of the hot blast stove.
Furthermore, a temperature monitoring device is arranged in each section of the hot air cover.
Compared with the prior art, the utility model can realize at least one of the following beneficial effects:
(1) the hot blast stove system provided by the utility model utilizes an energy-saving hot blast stove, the air source system comprises a normal-temperature air, medium-temperature air or/and flue gas supply unit, air from the air source system enters the hot blast stove system, and the air source system can be a flue gas treatment system, a sinter cooling system and/or a cold air supply system, can recycle heat in the whole sintering system and reduce energy consumption. Meanwhile, the hot blast stove provides high-temperature hot air for the sintering machine, and the sensible heat of the hot air can greatly replace the heat released by burning the carbon-containing fuel in the sintering raw material, so that low-carbon/ultra-low-carbon sintering is realized.
(2) The hot air main pipe of the low-temperature sintering system is connected with an oxygen supply system, and the oxygen content in the high-temperature air is regulated by monitoring the oxygen content in the high-temperature air, so that the carbon in the sintering material is fully combusted, and the oxygen-enriched sintering is realized.
(3) The high-temperature hot air cover is segmented, and the pipeline is provided with a valve for adjusting the flow of each segment, so that the amount of high-temperature air introduced in the sintering process at different stages can be set; by monitoring the temperature of each section of hot air cover, the reaction degree of mineral sintering can be known, so that the temperature of high-temperature air introduced into a sintering machine material surface layer is controlled; the outlet of the hot air cover is provided with a cyclone structure, so that high-temperature air is blown into a sinter bed more uniformly, the reaction is more sufficient, and the combustion is more sufficient; the settings of the hot air cover can monitor the sintering reactivity, adjust the high-temperature air inlet amount and the inlet mode, and save high-temperature hot air.
(4) The low-carbon sintering system provided by the utility model can greatly reduce the content of pollutants in sintering flue gas, can realize low-carbon low-pollutant emission in sintering, and can reduce ultralow emission of flue gas.
(5) The low-carbon sintering system provided by the utility model can be modified on the basis of the existing sintering process, saves the equipment cost and can be popularized in the market in a large range.
In the utility model, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the utility model, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a flow chart of a low-carbon sintering process in examples 1 to 3;
FIG. 2 is a flow chart of a low-carbon sintering process in example 4;
FIG. 3 is a schematic view of a gas-free blowing hot air hood;
FIG. 3a is a left side view of the non-gas blowing hot air hood in the direction A;
FIG. 3b is a left side view of the gas-free blowing hot air hood in the direction D-D;
FIG. 3c is a front view of the non-gas blowing hot air hood in the direction B;
FIG. 3d is a rear view of the non-gas blowing hot air hood in the direction of C;
FIG. 3E is a view showing no segment in the direction E-E of the non-gas blowing hot air hood;
FIG. 3f is a sectional view of the non-gas blowing hot air hood in the direction E-E;
FIG. 4 is a schematic view of a gas injection hot air hood;
FIG. 4a is a left side view of the gas blowing hot air hood in the direction A;
FIG. 4b is a left side view of the D-D direction of the hot air blowing hood with gas;
FIG. 4c is a front view of the gas injection hot air hood B;
FIG. 4d is a rear view of the gas injection hot air hood in the direction of C;
FIG. 4E is a view showing the gas blowing hot air hood in E-E direction without segments;
FIG. 4f is a sectional view of the gas injection hot air hood in the direction E-E;
FIG. 5 is a schematic view of the cyclone structure of the hot blast branch pipe orifice.
Reference numerals:
1-hot blast stove; 2-sintering machine; 3-an oxygen supply system; 4-a hot air main pipe; 5-hot air hood; 6-a gas system; 7-a gas main pipe; 8-hot air branch pipes; 9-hot blast branch pipe valve; 10-a gas branch pipe; 11-gas branch pipe valves; 12-large flue; 13-a dust removal system; 14-an exhaust fan; 15-a chimney; 16-a flue gas treatment system; 17-fan blades; 18-axis; 19-holes on the fan blades.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the utility model serve to explain the principles of the utility model and not to limit its scope.
The utility model discloses a low-carbon sintering system, which comprises an air source system, a hot blast furnace system and a sintering machine system which are sequentially connected through pipelines;
the air source system comprises a normal temperature air, medium temperature air or/and flue gas supply unit, and air from the air source system enters the hot blast stove system;
the hot blast stove system provides high-temperature hot air for sintering for the sintering machine system.
In the air source system, the normal temperature air supply unit can be a cold air supply system, the cold air supply system for conveying normal temperature air is adopted as the normal temperature air supply unit, and the cold air supply system is simultaneously connected with a combustion device of the hot blast stove and a heat accumulator device of the hot blast stove.
The cold air supply system provides normal-temperature air for combustion of the fuel of the hot blast stove, provides a normal-temperature air source for high-temperature air of the hot blast stove, and can adjust the supply amount and pressure of the normal-temperature air according to requirements. The cooling system cools the 700-900 ℃ sintered ore to below 200 ℃ by introducing air, and simultaneously discharges medium-temperature air, wherein the temperature range is 200-600 ℃.
Specifically, the cold air supply system is a normal temperature air conveying device, and pumps and sends normal temperature air to the hot blast stove heat accumulator device through a pipeline to provide normal temperature air for the hot blast stove, namely, a normal temperature air supply unit of the air source system.
The cold air supply system provides conventional air for burning the fuel of the hot blast stove on one hand, and provides a to-be-heated air source for a heat accumulator of the hot blast stove on the other hand, and the air supply quantity and pressure can be adjusted through a valve.
In order to recycle the heat in the system and reduce the energy consumption, the medium temperature air supply unit can be a sinter cooling system, normal temperature air is introduced into an air inlet of the sinter cooling system, and an air outlet is connected with an air inlet of a hot blast stove and used as the medium temperature air supply unit; the flue gas supply unit can be a flue gas treatment system, flue gas comes from the sintering machine and enters the flue gas treatment system through a flue gas pipe below the sintering machine, a gas inlet of the flue gas treatment system is connected with the flue gas pipe below the sintering machine, and a gas outlet of the flue gas treatment system is connected with a gas inlet of the hot blast stove and serves as the flue gas supply unit.
Specifically, the outlet of a flue gas treatment system of the sintering machine is connected to a hot blast stove through a pipeline; a sintering ore cooling system is correspondingly arranged at the discharging end of the sintering machine and used for cooling sintering ores, the sintering machine enters the sintering ore cooling system after discharging, and a gas outlet of the sintering ore cooling system is connected with an air inlet of a hot blast stove through a pipeline; and (4) feeding the medium-temperature air obtained by cooling into a hot blast stove to realize the recycling of hot air, and keeping the cooled sinter for later use.
Specifically, a flue gas pipe below the sintering machine is connected with an air inlet of the hot blast stove through a flue gas treatment system. Sintering hot smoke generated by a sintering machine is partially purified by a smoke treatment system and then used as an air source of a hot blast stove, the temperature range is generally 100-250 ℃, the oxygen content in the smoke is 15-20%, and the smoke is a smoke supply unit of the air source system.
Specifically, the cooling medium introduced into the air inlet of the sinter cooling system is normal temperature air, the cooling system cools the sinter at the temperature of 700 plus 900 ℃ to the temperature below 200 ℃ through the normal temperature air, and simultaneously discharges medium temperature air, the general temperature range of the medium temperature air is 200-600 ℃, the air outlet of the cooling system is connected with the air inlet of the hot blast stove, and the medium temperature air is sent into the hot blast stove through a pipeline and is a medium temperature air supply unit of the air source system.
Normal temperature air and/or flue gas and medium temperature air are introduced into the hot blast stove system, and become high temperature air to provide high temperature hot blast for sintering for the sintering system, and the high temperature hot blast is sent to the charge level of the sintering machine through the hot blast hood.
Specifically, the hot blast stove system consists of more than two groups of heat accumulating type hot blast stoves, and the adopted fuel is one or more than two of methane, hydrogen and coal gas. The heat accumulating type hot blast stove system can provide high-temperature hot blast for the sintering machine, the heat accumulating type hot blast stove heats a heat accumulator in the hot blast stove through combustion of combustible gas, and the heat accumulator stores heat; normal temperature air and/or smoke and medium temperature air are introduced, the heat accumulator transfers heat to the normal temperature air and/or smoke and medium temperature air to become high temperature air, the maximum temperature can reach 1300 ℃, and the high temperature air is introduced into a sintering machine.
Specifically, a hot air hood is arranged above the sintering machine; the hot air cover is connected with the hot air furnace through a hot air pipeline.
More specifically, the hot air hood is communicated with the hot air furnace through a hot air pipeline and is used for providing sintering heat; a flue gas pipe is correspondingly arranged below the sintering machine, and the flue gas pipe is introduced into the large flue and connected with an exhaust fan.
More specifically, a flue gas pipe (the position of which is not shown in fig. 1) is arranged below the sintering machine, the flue gas pipe is connected with a large flue, the large flue is connected with an air inlet of an exhaust fan, and the exhaust fan collects waste gas passing through the sintering machine through the flue gas pipe and circularly feeds the waste gas into the hot air hood through the large flue, the exhaust fan and a connecting pipeline to control the air temperature in the hot air hood and realize the cyclic utilization of hot flue gas.
The hot-blast cover communicates with each other with the hot-blast furnace through the pipeline, and hot-blast pipeline includes hot-blast person in charge and hot-blast branch pipe, the during operation: the hot blast stove provides high-temperature hot air for sintering; the high-temperature hot air firstly passes through the hot air main pipe, then the high-temperature air is introduced into the high-temperature hot air cover through the hot air branch pipe connected to the hot air main pipe, the high-temperature hot air is sent to the charge level of the sintering machine and enters the material layer of the sintering machine, the sintering material layer is heated, carbon in the material layer is combusted from top to bottom, and the sintering flue gas enters the flue gas treatment system after being discharged from the large flue of the sintering machine.
More specifically, the hot air pipeline comprises a hot air main pipe and a hot air branch pipe, the oxygen supply system is connected with the hot air main pipe, the hot air main pipe and the hot air branch pipe are heat preservation pipelines, the interior of the hot air main pipe and the hot air branch pipe are made of refractory materials, hot air branch pipe valves are arranged on the hot air branch pipes and are high-temperature-resistant hot air flow regulating valves, and the heat-resistant temperature is 1300 ℃.
It should be noted that the top-down combustion process is realized by bottom draft.
Flow regulating valves are arranged on connecting pipelines between the hot air cover and the hot air furnace (on the hot air branch pipes) and between the hot air cover and the exhaust fan, and the valves are high-temperature-resistant flow regulating valves. Through setting up flow control valve to can come control flow control valve's aperture according to the bed thickness of production output demand and cloth. On one hand, the opening degree of the flow regulating valve is utilized to control the flow of high-temperature air and the flow of waste gas entering the hot blast stove, so that the temperature of hot air is controlled, on the other hand, the flow regulating valve can be used for regulating the air speed of a material layer, and the air speed can be changed while the air temperature is kept stable by adding and subtracting the flow in proportion. Exemplarily, through the aperture that utilizes flow control valve to control hot-blast temperature and the wind speed size in each segmentation of hot-blast cover, when the bed of material is thicker, flow control valve aperture is corresponding great, and when the output demand increases, the accessible increases flow control valve aperture, improves the mode of hot air flow and wind temperature, improves sintering machine speed in step, and the sintering process is accelerated, realizes the increase of output, satisfies the production demand.
The high-temperature hot air cover is provided with a cyclone structure at the high-temperature air pipe opening leading into the sintering machine, so that high-temperature air is blown into a sintering material layer more uniformly, the reaction is more sufficient, and the combustion is more sufficient. Specifically, the cyclone structure is composed of a shaft and a plurality of fan blades, and holes are formed in the fan blades for introducing high-temperature air in a larger area.
Specifically, the sintering system further comprises an oxygen supply system and a gas system.
Specifically, the oxygen supply system is connected with the hot air pipeline, an oxygen supply flow regulating valve is arranged, and oxygen is introduced into the high-temperature hot air to regulate the oxygen content in the high-temperature hot air.
According to the above, if the normal temperature air of the cold air supply system is introduced into the hot blast stove, the normal temperature air is changed into the high temperature air through the hot blast stove, and the high temperature air is introduced into the sintering machine, theoretically, the oxygen content of the high temperature air is consistent with that of the normal temperature air, if the hot blast stove is introduced into part of hot flue gas in the sintering machine, the oxygen content is only 15% -20%, the oxygen content is too low, and when carbon distribution or reducing agents in the sintering machine need oxygen combustion reaction, the oxygen content needs to be increased, so that oxygen-enriched sintering is realized. The oxygen content of the high-temperature air is improved, the sufficient combustion of the added fuel in the sinter bed is facilitated, the combustion efficiency of the fuel is improved, and the carbon adding amount of the sintering is reduced.
More specifically, the oxygen supply system controls the oxygen amount of oxygen introduced into the high-temperature air through an oxygen supply flow regulating valve (automatic air supply valve) by monitoring the oxygen content in the high-temperature air in real time according to the set oxygen content, so that the oxygen content in the high-temperature air is regulated, oxygen-enriched sintering can be realized, and the oxygen content (volume percentage) in the high-temperature air is within the range of 21-50%; the oxygen amount introduced into the oxygen supply system is calculated by adopting the following formula:
wherein: r is the set volume fraction of oxygen in the high-temperature air; m is the amount of high-temperature air introduced per unit time, M3Min; n is the original volume fraction of oxygen in the high temperature air; x is the amount of oxygen needed to be introduced into the oxygen supply system in unit time, m3/min。
Specifically, the hot air cover is connected with a gas system, the gas system provides secondary temperature compensation for the sintering machine, and a gas branch pipe valve is arranged on the gas branch pipe to adjust the gas introduction amount.
High-temperature hot air is introduced into the hot air cover to cause heat loss, and when high-temperature hot air heat loss is required or is large, the gas system mainly has the effect of secondarily supplementing the high-temperature hot air through supplementing gas when the high-temperature hot air enters the high-temperature hot air cover in the sinter layer, so that the temperature of the high-temperature air is higher. The temperature of hot air is adjusted after the gas is combusted, the temperature of the hot air is ensured to be within a set range, the temperature stability of high-temperature hot air is facilitated, and the stability of the carbon blending quantity of the hot air instead of sintering is ensured.
Specifically, the interior of the hot air cover is provided with a refractory material, and the gap between the hot air cover and the trolley sideboard is less than 10 mm; two ends of the hot air cover are sealed; the interior of the hot air hood can be divided into a plurality of disconnected segments.
The small clearance between the hot air cover and the trolley sideboard is beneficial to preventing high-temperature air from leaking from the clearance, improving the hot air utilization rate and reducing the waste of the high-temperature air.
More specifically, the interior of the hot air hood can be divided into a plurality of sections which are not communicated, and the interior of the hot air hood is mainly divided into three main sections, namely a section of hot air hood, a second section of hot air hood, a third section of hot air hood and the like, which are arranged according to different sintering stages, wherein one section of hot air hood mainly corresponds to the material level of the front end 1/4 of the sintering machine, and the section forms a sintering zone on the surface of a material layer; the two sections of hot air covers are connected with the 1 section of hot air cover and cover the material level of the middle 1/2 of the sintering machine, and after the material level of the first section of hot air cover corresponds to the material level, a sintering zone with a certain thickness is formed on the upper part of the sintering material layer at the stage; the three-section hot air cover is connected with the two-section hot air cover to cover the material level of 1/4 at the rear end of the sintering machine, and the sintering material layer at this stage approaches to complete sintering after the material level of the two-section hot air cover corresponds to the material level.
The hot air cover is provided with a plurality of segments, and the segment control sintering is more accurate. Specifically, the hot air temperature of the temperature monitoring system on the hot air cover is fed back to the gas system, the difference value between the hot air temperature and the target temperature is compared, the gas quantity required by increasing the current temperature to the target temperature is calculated, and the hot air flow entering the hot air cover is controlled.
Specifically, the low-temperature sintering system further comprises a flue gas treatment system, wherein a gas inlet of the flue gas treatment system is connected with a flue gas pipe below the sintering machine, and a gas outlet of the flue gas treatment system is connected with a gas inlet of the hot blast stove and serves as a flue gas supply unit.
The utility model adopts energy-saving hot blast stoves using hot air, sintering waste gas and the like, wherein the hot blast stoves provide high-temperature hot air for the sintering machine, the sensible heat of the hot air can greatly replace the heat released by burning carbon-containing fuel in the sintering raw material, so that low-carbon/ultra-low-carbon sintering is realized, meanwhile, the air source of the hot blast stoves can come from the sintering machine, a sinter cooling system and/or a cold air supply system, the heat in the system can be recycled, and the energy consumption is reduced.
Compared with the prior art, the low-carbon sintering process method changes the normal-temperature air used in the traditional sintering, can realize that high-temperature hot air (such as air, sintering flue gas and/or cooling medium air) at 500-1300 ℃ is used in the sintering process, provides heat for sintering to replace partial sintering material carbon addition, and realizes low-carbon green sintering.
Compared with the prior art, the oxygen supply system provided by the utility model can realize oxygen-enriched sintering by monitoring the oxygen content in the high-temperature air in real time, controlling the oxygen amount of the oxygen introduced into the high-temperature air through the automatic air supply valve according to the set oxygen content and further adjusting the oxygen content in the high-temperature air.
Compared with the prior art, the hot blast stove system provided by the utility model is an energy-saving hot blast stove using hot air, and the hot blast stove provides high-temperature hot air for sintering from three parts which are respectively as follows: sintering machine, sinter cooling system, cold wind supply system, the inside heat of system recycles, reduces the energy consumption.
Example 1
The embodiment provides a low-carbon sintering system, and the system device is shown in figure 1. The specific details are as follows:
the hot blast stove 1 is composed of one or more groups of heat accumulating type hot blast stoves, an air inlet pipe of a hot blast stove system is divided into two paths, one branch pipeline is connected with a heat accumulator of the hot blast stove, the other branch pipeline is connected with a combustion device of the hot blast stove, and normal temperature air and/or smoke and medium temperature air are heated by the heat accumulating type hot blast stoves to become high temperature hot air so as to provide the high temperature hot air for sintering.
High-temperature hot air firstly passes through a hot air main pipe 4, then high-temperature air is introduced into a hot air cover 5 through a hot air branch pipe valve 9 on a hot air branch pipe 8 connected to the hot air main pipe, a cyclone device 17 at the opening of the hot air cover uniformly sends the high-temperature hot air to the charge level of the sintering machine 2 and enters the material layer of the sintering machine, an exhaust fan 14 connected with a flue gas pipeline below the sintering machine pumps away the air to form negative pressure, so that the high-temperature hot air enters the material layer, heats the sintering material layer and burns carbon in the material layer from top to bottom to form sintering; when the oxygen content of the high-temperature hot air in the hot air hood 5 is lower, the oxygen supply system 3 is automatically started to realize oxygen-enriched sintering; when the sensible heat of the high-temperature hot air in the hot air cover can not meet the operation requirement, the gas system 6 is started, and the high-temperature hot air in the hot air cover is secondarily supplemented with temperature through the control of the gas branch pipe valve 11 on the gas branch pipe 4 to meet the sintering operation requirement.
Flue gas generated by sintering is discharged from a flue gas pipe below the sintering machine and connected with the large flue 12 and then enters a flue gas treatment system 16; the outlet of the flue gas treatment system 16 is connected to the air inlet of the hot blast stove through a pipeline; the sintering machine 2 discharges materials and then enters a sinter cooling system, and a gas outlet of the sinter cooling system is connected with an air inlet of a hot blast stove through a pipeline; high-temperature hot air circulation and heat circulation in the system are realized.
And the rest sintering flue gas is processed by the dust removal system 13 and the flue gas processing system 16 to meet the emission requirement, and then is discharged through the chimney 15.
Example 2
The embodiment provides a low-carbon sintering system, and the system device is shown in figure 1. The specific details of the practical application and the beneficial effects are as follows:
this embodiment is a 400m stand2The sintering machine includes two hot blast stoves, which are hydrogen fuel and produce high temperature hot blast of 1000 deg.c. The hot blast stove comprises a high-temperature hot air source for sintering, wherein one part of the high-temperature hot air source is hot air from a sinter cooling system, the air temperature is 450 ℃, and the sinter is cooledThe hot air provided by the system can reduce the energy consumption of the hot air furnace by more than 15 percent; the other part is normal temperature air from a cold air supply system.
The cooling medium of the sinter cooling system is air, the sinter at 760 ℃ is cooled to 180 ℃, meanwhile, the middle-temperature air at 450 ℃ is discharged, 60% of hot air volume is provided for the sintering machine, and the sinter cooling system adopts a vertical cooler, so that the maximum recovery amount of sensible heat of the sinter can be realized;
the cold air supply system provides air for the combustion of fuel burnt by the hot blast stove 1 and provides an air source for high-temperature hot air of the hot blast stove, and the provided air accounts for 40% of the large amount of hot air required by the sintering machine;
the oxygen supply system is connected with the hot air pipeline, and oxygen is introduced into the hot air before the high-temperature hot air enters the high-temperature hot air cover of the sintering machine, so that the oxygen content in the high-temperature hot air reaches 25 percent. The oxygen supply system calculates the amount of oxygen to be sprayed into the hot air pipeline according to the air volume provided by the sinter cooling system, the air volume provided by the cold air supply system and the set 25% oxygen content.
A high-temperature hot air cover is arranged on the charge level of the sintering machine, a refractory material is arranged in the hot air cover, and the gap between the hot air cover and the trolley breast board is less than 10 mm; the two ends of the hot air cover are sealed, and the inside of the hot air cover is divided into 3 sections which are not communicated, and the inside of the hot air cover is not communicated.
The hot smoke from the sintering machine passes through the smoke treatment system, and only after dust removal, the discharged smoke meets the latest ultralow emission standard.
SO in exhaust flue gas in example 12Content (wt.)<30mg/Nm3NOx content<50mg/Nm3Dust content<10mg/Nm3And the latest ultralow emission standard is achieved. Meanwhile, the carbon content in the sintering raw materials can be reduced by more than 70% through high-temperature hot air circulation sintering.
Example 3
The embodiment provides a low-carbon sintering system, which is applied to actual production, and the process flow chart is shown in fig. 1. The specific details are as follows:
this example is a 360m sinter production line 22, the sintering machine is made by mixing iron ore powderAnd (5) feeding. The batch parameters under conventional conditions, i.e. no hot air conditions, are given in Table 1, and the amount of air required for conventional sintering is 2550 ten thousand Nm3/h。
TABLE 1 sintering and proportioning parameter table under traditional conditions
Firstly, normal temperature air is changed into high temperature air of 1000 ℃ after passing through a hot blast stove 1; then the high-temperature hot gas firstly passes through the hot air main pipe 4, then the high-temperature hot gas is introduced into the high-temperature hot air cover 5 through 6 hot air branch pipes 8 connected to the hot air main pipe, and then the high-temperature hot air is sent to the charge level of the sintering machine 2; and finally, high-temperature hot air enters the sinter bed from the material surface of the sintering machine 2, heats the sinter bed, burns carbon in the sinter bed from top to bottom and realizes the sintering process of the sinter bed. The sintering batching parameters after the hot air is introduced are shown in the table 2.
TABLE 2 sintering and proportioning parameter table under hot air (1000 deg.C)
The fuel adopted by the hot blast stove is methane, and the temperature is raised to 1000 ℃ after the hot blast stove is heated by air at normal temperature; meanwhile, the oxygen supply system 3 is connected to the hot air main pipe 4, and the oxygen supply system can increase the oxygen content in the high-temperature hot air by introducing oxygen into the high-temperature hot air, so that the oxygen content in the high-temperature hot air is increased to 25%. Under these conditions, 1530 ten thousand Nm of hot blast is required for sintering3The air volume is reduced by 40 percent, and the fuel addition can be reduced by 80 percent.
The hot air main pipe 4 and the hot air branch pipe 8 are heat insulation pipes, the interior of the hot air main pipe and the interior of the hot air branch pipe are made of refractory materials, and the hot air branch pipe valves 9 on the hot air branch pipes 8 are high-temperature-resistant hot air valves, and the heat-resistant temperature is 1300 ℃.
The high-temperature hot air cover 5 is a hot air cover on the sintering machine, a refractory material is arranged in the high-temperature hot air cover 5, and the gap between the hot air cover and the trolley sideboard is less than 10 mm; two ends of the high-temperature hot air cover 5 are sealed; the interior of the high-temperature hot air cover 5 can be divided into 6 disconnected segments, namely 1 segment, 2 segments, 3 segments, 4 segments, 5 segments and 6 segments in sequence from the machine head to the machine tail; wherein, 1 segment corresponds to 1 section of hot air cover, 2, 3, 4 and 5 segments correspond to 2 sections of hot air covers, and 6 segments correspond to 3 sections of hot air covers; each section corresponds to one hot air branch pipe 8, and the hot air quantity entering each section is controlled through a hot air valve 9 on the hot air branch pipe 8.
The high-temperature hot air cover 5 is connected with the gas system 6, methane provided by the gas system 6 is connected with the high-temperature hot air cover 5 through a gas main pipe 7 and a gas branch pipe 10, a gas branch pipe valve 11 is arranged on the gas branch pipe 10 to adjust the gas flow of each branch pipe, and each gas branch pipe 10 is connected with one section inside the high-temperature hot air cover 5.
Flue gas of the sintering machine enters a dust removal system 13 for dust removal after passing through a large flue 12, then passes through an induced draft fan 14, and finally is discharged from a chimney 15.
SO in exhaust flue gas in example 32Content (wt.)<30mg/Nm3NOx content<50mg/Nm3Dust content<10mg/Nm3And the latest ultralow emission standard is achieved. Meanwhile, the high-temperature hot air sintering reduces the carbon content in the sintering material from 3% to below 0.6%, and can reduce the carbon content in the sintering raw material by more than 80%.
Example 4
The embodiment provides a low-carbon sintering system, which is applied to actual production, and the process flow chart is shown in fig. 2. The specific details are as follows:
this example is a 360m sinter production line2The sintering machine adopts a mixture of iron ore powder as a raw material. The batch parameters under conventional conditions, i.e. no hot air conditions, are given in Table 3, and the amount of air required for conventional sintering is 2550 ten thousand Nm3/h。
Table 3 sintering and proportioning parameter table under traditional conditions
Firstly, normal temperature air is changed into high temperature air at 1150 ℃ after passing through a hot blast stove; then the high-temperature air passes through the hot air main pipe, then the high-temperature air is introduced into the high-temperature hot air cover through 6 hot air branch pipes connected to the hot air main pipe, and then the high-temperature hot air is sent to the charge level of the sintering machine; and finally, high-temperature hot air enters the sinter bed from the charge level of the sintering machine, heats the sinter bed, burns carbon in the sinter bed from top to bottom, and realizes the sintering process of the sinter bed. The sintering batching parameters after the hot air is introduced are shown in the table 4.
TABLE 4 sintering and proportioning parameter table under hot air (1150 deg.C)
The fuel adopted by the hot blast stove is methane, and the temperature is 1150 ℃ after the hot blast stove is heated by normal temperature air; meanwhile, the hot air main pipe is connected with an oxygen supply system, and the oxygen supply system can increase the oxygen content in the high-temperature air by introducing oxygen into the high-temperature air, so that the oxygen content in the high-temperature air is increased to 25%. Under the condition, the amount of hot air required for sintering is 1275 ten thousand Nm3The air volume is reduced by 50 percent, and the fuel addition can be reduced by 90 percent.
SO in exhaust flue gas in example 42Content (wt.)<30mg/Nm3NOx content<50mg/Nm3Dust content<10mg/Nm3And the latest ultralow emission standard is achieved. Meanwhile, the high-temperature hot air sintering reduces the carbon blending amount in the sintering material from 3% to below 0.4%, and can reduce the carbon blending amount in the sintering raw material by 90%.
Example 4 also provides an over-burning prevention system for the sintered ore, which is activated if the temperature of the hot wind reaches 1170 ℃ or above, and a proper amount of room temperature air is blown into the hot wind main pipe to be mixed with the hot wind, so as to ensure that the temperature of the hot wind entering the high-temperature hot wind cover 5 is in the range of 1150 +/-20 ℃.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. A low-carbon sintering system is characterized by comprising an air source system, a hot blast stove system and a sintering system which are sequentially connected through pipelines;
the air source system comprises a normal-temperature air, medium-temperature air or/and flue gas supply unit, and air from the air source system enters the hot blast stove system;
the hot blast stove system provides high-temperature hot air for sintering for the sintering machine system.
2. The low carbon sintering system of claim 1, wherein the hot blast stove system consists of more than two groups of regenerative hot blast stoves.
3. The low carbon sintering system of claim 1, wherein the sintering machine system comprises a sintering machine and a hot air hood disposed above the sintering machine; the hot air hood is connected with a hot air furnace system through a hot air pipeline, and high-temperature hot air is conveyed to the charge level of the sintering machine through the hot air hood.
4. The low-carbon sintering system of claim 3, further comprising an oxygen supply system, wherein the oxygen supply system is connected with the hot air pipeline, and the oxygen supply amount of the oxygen supply system is adjustable.
5. The low-carbon sintering system according to claim 3, wherein the low-carbon sintering machine system further comprises a gas system, the hot air hood is connected with the gas system, the gas system provides secondary temperature compensation for the sintering machine, and the gas introduction amount of the gas system is adjustable.
6. The low carbon sintering system of claim 3, wherein the hot air hood is provided with refractory material inside, the two ends of the hot air hood are sealed, and the inside of the hot air hood is divided into a plurality of disconnected segments.
7. The low-carbon sintering system according to claim 1, further comprising a flue gas treatment system, wherein a gas inlet of the flue gas treatment system is connected with a flue gas pipe below the sintering machine, and a gas outlet of the flue gas treatment system is connected with a gas inlet of the hot blast stove to serve as a flue gas supply unit.
8. The low-carbon sintering system according to claim 1, further comprising a sinter cooling system, wherein normal temperature air is introduced into an air inlet of the sinter cooling system, and an air outlet of the sinter cooling system is connected with an air inlet of the hot blast stove and serves as a medium temperature air supply unit.
9. The low-carbon sintering system of claim 1, wherein a cold air supply system for supplying normal temperature air is adopted as the normal temperature air supply unit, and the cold air supply system is simultaneously connected with a combustion device of the hot blast stove and a heat accumulator device of the hot blast stove.
10. The low carbon sintering system of any one of claims 3 to 6, wherein a temperature monitoring device is arranged in each section of the hot air hood.
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