CN112410546A - Hydrogen energy medium combined microwave sintering method and sintering heating system - Google Patents
Hydrogen energy medium combined microwave sintering method and sintering heating system Download PDFInfo
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- CN112410546A CN112410546A CN202010122185.9A CN202010122185A CN112410546A CN 112410546 A CN112410546 A CN 112410546A CN 202010122185 A CN202010122185 A CN 202010122185A CN 112410546 A CN112410546 A CN 112410546A
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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
- C22B1/22—Sintering; Agglomerating in other sintering apparatus
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
Abstract
A hydrogen energy medium combined microwave sintering method and a sintering heating system comprise the following steps: 1) preparing a sintering material: mixing iron ore, solid fuel and flux to prepare a material to be sintered; 2) heating the material to be sintered: the material to be sintered enters a microwave sintering area, the material to be sintered is ignited by microwave, and the material to be sintered is combusted to generate carbon dioxide and water vapor; 3) preparing a hydrogen energy medium: introducing the carbon dioxide and the water vapor in the step 2) into a gasification furnace as gasification agents, and reacting with coal to be gasified to generate CO and H2(ii) a 4) Introducing the hydrogen energy medium generated in the step 3) into a microwave sintering area to burn and heat the material to be sintered; 5) and obtaining the sinter after sintering the sintering material. This application utilizes carbon dioxide and vapor that produce among the sintering process to let in the gasifier and react with high-hydrogen low-quality coal, lets in the burning in the sintering cover again with the water gas that generates and burns, improves the combustion temperature of treating the sintering material, improves sintering effect, sparingly canThe source is consumed.
Description
Technical Field
The invention relates to a sintering method, in particular to a hydrogen energy medium combined microwave sintering method, belonging to the technical field of mineral aggregate sintering; the invention also relates to a sintering heating system.
Background
The steel industry is typically an energy intensive sector with energy consumption as high as 10% to 15% of the world's energy consumption. Sintering is used as a front-end process in the iron and steel industry, the process energy consumption is high, the process energy consumption is higher than that of the second step in the iron and steel industry, and the combustion of solid fuel in the sintering process is also an atmospheric pollutant NO in the iron and steel industryx、COxThe main source of the emission, SOxAn important source of emissions. In addition, the sintered ore accounts for more than 70 percent of blast furnace ironmaking burden, and the quality of the sintered ore is closely related to the stable and smooth operation, high efficiency, low consumption, large coal injection technology and the like of a large blast furnace.
The sintering waste gas temperature is low, the waste gas quantity is large, the pollutant content is high, and the components are complex, so that the method is a difficult point and a key point for low-temperature waste heat utilization and waste gas treatment in the steel industry. The sintering waste gas circulation not only can obviously reduce the total waste gas emission amount and pollutant emission amount of the sintering process, but also can recover low-temperature waste heat in the flue gas and save energy consumption of the sintering process, and has great energy-saving, emission-reducing, popularization and application values.
Therefore, how to provide a hydrogen energy medium combined microwave sintering method to increase the utilization of clean energy, which can increase the combustion temperature of the material to be sintered, improve the ignition effect, improve the sintering quality, save the energy consumption, and realize green, efficient and low-consumption sintering production is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention is directed to a method for reacting high-hydrogen low-quality coal with carbon dioxide and steam generated during sintering in a gasification furnace to generate water gas (CO, H)2) Then the mixture is introduced into a sintering cover for combustion, so that the combustion temperature of the materials to be sintered is increased, the sintering effect is improved, and the energy consumption is saved. The invention provides a hydrogen energy medium combined microwave sintering method, which comprises the following steps: 1) sinteringPreparing materials: mixing iron ore, solid fuel and flux to prepare a material to be sintered; 2) heating the material to be sintered: distributing materials to be sintered on a sintering machine, and feeding the materials to be sintered into a microwave heating area of the sintering machine; heating the material to be sintered by a microwave heating zone to start sintering, wherein the material to be sintered generates tail gas containing carbon dioxide and water vapor in the sintering process; 3) preparing a hydrogen energy medium: introducing the tail gas containing carbon dioxide and water vapor generated in the step 2) into a gasification furnace as a gasification agent, wherein the carbon dioxide and the water vapor react with coal to be gasified in the gasification furnace to generate CO and H2, and the CO and H2 are hydrogen energy media; 4) introducing the hydrogen energy medium generated in the step 3) into a microwave heating area of a sintering machine, and sintering the material to be sintered by combining the hydrogen energy medium with microwave heating; the tail gas containing carbon dioxide and water vapor generated in the sintering process is continuously conveyed into the gasification furnace, and the circulation is carried out; 5) and obtaining the sinter after sintering the sintering material.
According to a first embodiment of the invention, there is provided a hydrogen energy medium in combination with a microwave sintering process:
a hydrogen energy medium combined microwave sintering method comprises the following steps: 1) preparing a sintering material: mixing iron ore, solid fuel and flux to prepare a material to be sintered; 2) heating the material to be sintered: distributing materials to be sintered on a sintering machine, and feeding the materials to be sintered into a microwave heating area of the sintering machine; heating the material to be sintered by a microwave heating zone to start sintering, wherein the material to be sintered generates tail gas containing carbon dioxide and water vapor in the sintering process; 3) preparing a hydrogen energy medium: introducing the tail gas containing carbon dioxide and water vapor generated in the step 2) into a gasification furnace as a gasification agent, and reacting the carbon dioxide and the water vapor with coal to be gasified in the gasification furnace to generate CO and H2，CO、H2Is a hydrogen energy medium; 4) introducing the hydrogen energy medium generated in the step 3) into a microwave heating area of a sintering machine, and sintering the material to be sintered by combining the hydrogen energy medium with microwave heating; the tail gas containing carbon dioxide and water vapor generated in the sintering process is continuously conveyed into the gasification furnace, and the circulation is carried out; 5) and obtaining the sinter after sintering the sintering material.
Preferably, in step 3),reacting tail gas containing carbon dioxide and water vapor with coal to be gasified to generate CO and H2Specifically, the equation for the reaction of the tail gas containing carbon dioxide and water vapor with the coal to be gasified is as follows:
C+H2O＝CO+H2——131KJ/mol (1)
C+CO2＝2CO——172KJ/mol (2)
wherein, the two reactions are endothermic reactions, and the reaction temperature T is 1100-1600 ℃, preferably 1150-1500 ℃; the reaction pressure P is 2.5-10MPa, preferably 3.0-80 MPa.
Preferably, in the step 3), the step of introducing the off-gas containing carbon dioxide and water vapor of the step 2) into the gasifier as a gasifying agent is specifically: extracting sintering flue gas from a flue of the sintering machine, and removing dust in the flue gas through a flue gas dust removal device to obtain tail gas containing carbon dioxide and water vapor; and introducing the tail gas containing carbon dioxide and water vapor into the gasification furnace.
Preferably, the off-gas containing carbon dioxide and water vapor is pumped into the gasifier by a booster pump.
Preferably, the step 1) further comprises the steps of: and drying and preheating the material to be sintered.
Preferably, the material to be sintered is dried and preheated by using a hydrogen energy medium in the step 4).
Preferably, the step 4) further comprises the steps of: and introducing combustion-supporting gas into the microwave sintering zone.
Preferably, the combustion-supporting gas is air, pure oxygen gas or oxygen-enriched gas.
Preferably, the step 4) further comprises the steps of: detecting the combustion temperature Q of the sintering material in the microwave sintering zonersIf combustion temperature QrsIf the temperature is less than 1200 ℃, the supply amount of the hydrogen energy medium and the combustion-supporting gas is increased; if the combustion temperature QrsThe temperature is more than or equal to 1200 ℃, so that the supply amount of the hydrogen energy medium and the combustion-supporting gas is reduced.
Preferably, the step 2) further comprises the steps of: microwave suppressors are arranged at the upstream and/or the downstream of the microwave sintering zone.
Preferably, in step 3), the coal to be gasified is high-hydrogen low-quality coal (such as lignite, high-sulfur coal, high-ash coal, sub-bituminous coal, lean coal and the like).
Preferably, in step 1), the solid fuel is high-hydrogen coal, preferably high-hydrogen high-quality coal (such as high-quality high-volatile coal such as bituminous coal, long-flame coal, non-caking coal, weakly caking coal, and the like).
According to a second embodiment of the present invention, there is provided a sintering heating system:
a sintering heating system to which the first embodiment is applied, the system comprising: the device comprises a sintering cover, a microwave heating area, a microwave heating device, a sintering machine, a flue and a gasification furnace; the sintering cover is arranged above the sintering machine, and the microwave heating area is arranged in the sintering cover; the microwave heating device is arranged at the upper end and/or the side wall of the sintering cover and is communicated with the microwave heating area; a flue of the sintering machine is connected into a gasification furnace through an air extraction pipeline; and an exhaust port of the gasification furnace is communicated to the inside of the sintering cover through a hydrogen energy conveying pipeline.
Preferably, the exhaust port of the gasification furnace is communicated with the inside of the sintering cover through a hydrogen energy conveying pipeline, and the system further comprises: and the gas inlet is arranged at the upper end and/or the side wall of the sintering cover and communicated with the inside of the microwave heating area, and the gas inlet is communicated with the hydrogen energy conveying pipeline.
Preferably, the system further comprises: the booster pump is arranged on the air exhaust pipeline; the dust removing device is arranged on the air draft pipeline at the upstream of the booster pump.
Preferably, the system further comprises: the fuel regulating valve is arranged on the hydrogen energy conveying pipeline; the temperature sensor is arranged on the inner side of the sintering cover.
Preferably, the bypass outlet of the fuel regulating valve is in communication with the integrated fuel line.
Preferably, the comprehensive fuel pipeline is connected with a combustion-supporting gas preheating system, a sintering mineral aggregate drying and preheating system or an active carbon desorption tower heating system.
Preferably, the system further comprises: and the air guide holes are formed in the upper end and/or the side wall of the sintering cover.
Preferably, the system further comprises: and the microwave suppressors are arranged at the feed end and the discharge end of the sintering cover.
In the first embodiment of the present application, in order to sufficiently combust the iron ore, the iron ore and the solid fuel are made into the material to be sintered, so that the combustion area of the iron ore is increased, the distance between the iron ore and the combustion flame is reduced, and the sintering effect is improved. Meanwhile, the microwave heating device is used for heating the sintering materials, so that the combustion efficiency of the materials to be sintered and the production quality index of the sintering ore are improved. After the solid fuel is combusted, a large amount of carbon dioxide and steam high-temperature gas are generated. Introducing the part of carbon dioxide and steam high-temperature gas into a gasification furnace, and reacting with coal to be gasified to generate combustible gas, wherein the combustible gas comprises: CO, H2(ii) a These gases are also known as hydrogen energy media. And then the generated hydrogen energy medium is introduced into the microwave sintering area and is used for heating and igniting the material to be sintered, so that the ignition speed of the material to be sintered is increased, the ignition speed of the microwave sintering area is increased, and the overall production speed is increased. In the prior art, chemical reactions in gasifiers need to be carried out at high temperatures and pressures. Generally, in a gasification furnace, when the temperature is reduced and the pressure is insufficient, oxygen is introduced to combust coal to be gasified, so that the temperature and the air pressure in the furnace are increased. According to the scheme provided by the application, carbon dioxide and steam high-temperature gas generated in the sintering process are creatively utilized to be introduced into the gasification furnace and react with coal to be gasified, so that air or oxygen does not need to be additionally introduced into the gasification furnace, the coal to be gasified is only used for gasification reaction, and the temperature in the gasification furnace does not need to be increased by burning. The utilization rate of the coal to be gasified is improved.
In the prior art, in order to increase the temperature and pressure of the gasification furnace, air or oxygen is introduced into the gasification furnace, so that high-hydrogen coal (such as lignite, high-sulfur coal, high-ash coal, subbituminous coal, lean coal and the like) in the gasification furnace and the originally generated hydrogen energy medium undergo an oxidation-reduction reaction to generate carbon dioxide and water vapor. In this application, carbon dioxide and vapor are produced by waiting to sinter the material burning, and the gasifier need not rethread air or oxygen and burns, has reduced the working procedure of gasifier, has improved the efficiency of gasifier to whole production efficiency has been improved.
It should be noted that microwave is used as a heating means, and has the characteristics of selective heating, rapid heating, volume heating, instant heating, activation of metallurgical chemical reaction, cleanness and the like; the temperature of the materials can be quickly raised, and the chemical reaction is accelerated; the microwaves directly act on the material body through the wave-transparent material, so that the conduction heat loss is reduced, no gas is generated during microwave heating, and the exhaust emission is reduced, thereby realizing the purposes of energy conservation and emission reduction.
In a first embodiment of the present application, the reaction occurring in the gasifier is an endothermic reaction. The reaction equation is as follows:
C+H2O＝CO+H2——131KJ/mol (1)
C+CO2＝2CO——172KJ/mol (2)
the reaction is guided by controlling the working conditions in the gasifier. Due to the high-temperature carbon dioxide and water vapor introduced by the sintering flue, only the two reactions are carried out on the high-hydrogen coal (high-quality high-volatile coal such as bituminous coal, long-flame coal, non-caking coal, weakly caking coal and the like). The purity of the reaction product in the gasification furnace is improved.
In the first embodiment of the application, the flue gas generated after the material to be sintered is combusted is downward to enter the flue below the material surface of the sintering machine under the action of negative pressure. The smoke in the flue is extracted by arranging an air extraction pipeline. The dust of the extracted flue gas is removed by a dust removal device, and then the high-temperature gas of carbon dioxide and water vapor can be obtained. The purity of the high-temperature gas supplied to the gasification furnace can be improved. If the flue gas is directly introduced into the gasification furnace, other reactions occur in the gasification furnace due to a large amount of dust in the flue gas, so that the product purity of the gasification furnace is affected.
It should be noted that the booster pump can accelerate the dust removal of the dust removal device, and can also increase the pressure of the high-temperature tail gas introduced into the gasification furnace.
In the first embodiment of the application, the hydrogen energy medium generated in the gasification furnace can be used for heating the material to be sintered in the microwave sintering area, but if the combustion temperature of the material to be sintered reaches the standard, the redundant hydrogen energy medium can also be used for drying and preheating the material to be sintered in the step 1). Namely, the hydrogen energy medium additionally generated in the gasification furnace can also be used in other heating links of enterprise production.
In a first embodiment of the present application, combustion-supporting gas is introduced into the microwave sintering zone to sufficiently burn the material to be sintered. Specifically, combustion-supporting gas is introduced into the microwave sintering area in two modes, wherein the first mode is that the combustion-supporting gas is introduced into the gas inlet, so that the combustion-supporting gas is combusted before the hydrogen energy medium is mixed. The second is that the sintering cover is provided with air guide holes, and external air enters the microwave sintering area from the air guide holes to participate in combustion.
In the first embodiment of the application, the supply amount of the hydrogen energy medium and the combustion-supporting gas is judged by detecting the combustion temperature of the material to be sintered in the microwave sintering area, so that the material to be sintered can be controlled in a specified combustion temperature range, and the sintering quality is ensured.
In the first embodiment of the present application, the microwave is prevented from being diffused to the outside by providing microwave suppressors upstream and downstream of the microwave sintering zone.
In the first embodiment of the present application, the coal to be gasified is high-hydrogen low-quality coal, and the solid fuel is high-hydrogen coal (high-quality high-volatile coal such as bituminous coal, long-flame coal, non-sticky coal, weakly sticky coal, and the like). In the actual production process, when the iron and steel production enterprises purchase coal to the coal production enterprises, the coal with different qualities can be purchased, the high-quality coal suitable for combustion can be used as solid fuel, and the coal with low combustion value but containing a large amount of biomass can be used for gasification to generate a high-purity hydrogen energy medium for auxiliary combustion. Therefore, corresponding production strategies can be formulated for different types of coal, and reasonable use of coal resources is realized.
In a second embodiment of the present application, the flue of the sintering machine is connected to the gasification furnace through an air suction pipeline, and the exhaust port of the gasification furnace is communicated to the inside of the sintering hood through a hydrogen energy conveying pipeline. Carbon dioxide and steam high-temperature gas generated by sintering participate in gasification reaction in a gasification furnace to generate a hydrogen energy medium, and then the hydrogen energy medium is introduced into a microwave sintering area in a sintering cover to be combusted and heated to the material to be sintered. Meanwhile, the microwave heating device is used for heating the sintering materials, so that the combustion efficiency of the materials to be sintered is improved. The combustion temperature of the materials to be sintered is increased, the sintering effect is improved, and the energy consumption is saved.
In the second embodiment of the application, the hydrogen energy medium is sprayed into the microwave sintering area through the air inlet, so that the length of flame can be increased, the flame generated by the combustion of the hydrogen energy medium is contacted with the material to be sintered, and the sintering effect is improved. And the gas inlet is also provided with a combustion-supporting gas port for accessing combustion-supporting gas, so that the hydrogen energy medium and the combustion-supporting gas are fully mixed in the gas inlet and then are sprayed and combusted.
In a second embodiment of the present application, the dust in the flue gas in the suction line is removed by means of a dust removal device. The purity of the high-temperature gas is improved. Meanwhile, the booster pump is used for boosting the high-temperature tail gas.
In the second embodiment of the application, the fuel regulating valve is matched with the temperature sensor to control the combustion temperature of the material to be sintered in real time, and the fuel regulating valve is regulated according to the monitored temperature data so as to regulate the spraying amount of the hydrogen energy medium. In addition, the fuel regulating valve can also guide the hydrogen energy medium into the comprehensive fuel pipeline through a bypass outlet for other applications.
In the second embodiment of the present application, air is supplied into the sintering hood through the air guide holes; the leakage of microwaves is suppressed by the microwave suppressor.
The invention aims to provide a sintering method capable of effectively saving energy and reducing emission, which adopts microwave to sinter, fully utilizes tail gas, introduces the sintering tail gas into a gasification furnace to react according to coal gasification reaction, obtains hydrogen energy media such as clean hydrocarbon compounds and the like, and then enters a microwave sintering area to realize combined microwave sintering of the hydrogen energy media.
Compared with the prior art, the invention has the following beneficial effects:
1. the technical scheme provided by the application can reasonably reduce the consumption of the solid fuel and obtain uniform heating and homogeneous sintering;
2. the technical scheme provided by the application can greatly improve the yield and quality index of the sinter;
3. the technical scheme provided by the application can greatly reduce the discharge amount of COx, SOx and NOx.
Drawings
FIG. 1 is a flow chart of a method for sintering a hydrogen energy medium in combination with microwaves according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a sintering heating system according to an embodiment of the present invention.
Reference numerals:
1: a sintering cover; 101: a microwave sintering zone; 102: an air vent; 2: a microwave heating device; 3: sintering machine; 301: a flue; 4: a gasification furnace; 5: an air inlet; 6: a booster pump; 7: a dust removal device; 8: a fuel regulating valve; 801: a bypass outlet; 9: a temperature sensor; 10: a microwave suppressor;
lc: an air extraction duct; and (Lq): a hydrogen energy delivery conduit; and Lz: a fuel line.
Detailed Description
According to a first embodiment of the invention, there is provided a hydrogen energy medium in combination with a microwave sintering process:
a hydrogen energy medium combined microwave sintering method comprises the following steps: 1) preparing a sintering material: mixing iron ore, solid fuel and flux to prepare a material to be sintered; 2) heating the material to be sintered: distributing materials to be sintered on a sintering machine, and feeding the materials to be sintered into a microwave heating area of the sintering machine; heating the material to be sintered by a microwave heating zone to start sintering, wherein the material to be sintered generates tail gas containing carbon dioxide and water vapor in the sintering process; 3) preparing a hydrogen energy medium: introducing the tail gas containing carbon dioxide and water vapor generated in the step 2) into a gasification furnace 4 as a gasification agent, and reacting the carbon dioxide and the water vapor with the coal to be gasified in the gasification furnace 4 to generate CO and H2，CO、H2Is a hydrogen energy medium; 4) introducing the hydrogen energy medium generated in the step 3) into a sintering machineIn the microwave heating area, the hydrogen energy medium is combined with microwave heating to sinter the material to be sintered; tail gas containing carbon dioxide and water vapor generated in the sintering process is continuously conveyed into the gasification furnace 4, and the circulation is carried out; 5) and obtaining the sinter after sintering the sintering material.
Preferably, in step 3), the tail gas containing carbon dioxide and water vapor reacts with the coal to be gasified to generate CO and H2Specifically, the equation for the reaction of the tail gas containing carbon dioxide and water vapor with the coal to be gasified is as follows:
C+H2O＝CO+H2——131KJ/mol (1)
C+CO2＝2CO——172KJ/mol (2)
wherein, the two reactions are endothermic reactions, the reaction temperature T is 1100-1600 ℃, and the reaction pressure P is 2.5-10 MPa.
Preferably, in the step 3), the step 2) of introducing the tail gas containing carbon dioxide and water vapor into the gasification furnace 4 as a gasifying agent specifically comprises: extracting sintering flue gas from a flue 301 of the sintering machine 3, and removing dust in the flue gas through a flue gas dust removal device to obtain tail gas containing carbon dioxide and water vapor; and then introducing the tail gas containing carbon dioxide and water vapor into the gasification furnace 4.
Preferably, the off-gas containing carbon dioxide and water vapor is pumped into the gasification furnace 4 by a booster pump 6.
Preferably, the step 1) further comprises the steps of: and drying and preheating the material to be sintered.
Preferably, the material to be sintered is dried and preheated by using a hydrogen energy medium in the step 4).
Preferably, the step 4) further comprises the steps of: and introducing combustion-supporting gas into the microwave sintering zone.
Preferably, the combustion-supporting gas is air, pure oxygen gas or oxygen-enriched gas.
Preferably, the step 4) further comprises the steps of: detecting the combustion temperature Q of the sintering material in the microwave sintering zonersIf combustion temperature QrsIf the temperature is less than 1200 ℃, the supply amount of the hydrogen energy medium and the combustion-supporting gas is increased; if the combustion temperature QrsNot less than 1200 ℃, is reducedThe supply amount of the hydrogen energy medium and the combustion-supporting gas is reduced.
Preferably, the step 2) further comprises the steps of: a microwave suppressor 10 is provided upstream and/or downstream of the microwave sintering zone.
Preferably, in step 3), the coal to be gasified is high-hydrogen low-quality coal (such as lignite, high-sulfur coal, high-ash coal, sub-bituminous coal, lean coal and the like).
Preferably, in step 1), the solid fuel is high-hydrogen coal (high-quality high-volatile coal such as bituminous coal, long-flame coal, non-caking coal, weakly caking coal, and the like).
According to a second embodiment of the present invention, there is provided a sintering heating system:
a sintering heating system to which the first embodiment is applied, the system comprising: a sintering cover 1, a microwave heating zone 101, a microwave heating device 2, a sintering machine 3, a flue 301 and a gasification furnace 4; the sintering cover 1 is arranged above the sintering machine 3, and the microwave heating area 101 is arranged in the sintering cover 1; the microwave heating device 2 is arranged on the upper end and/or the side wall of the sintering cover 1 and is communicated with the microwave heating area 101; a flue 301 of the sintering machine 3 is connected to the gasification furnace 4 through an air suction pipeline Lc; an exhaust port of the gasification furnace 4 is communicated to the sintering cover 1 through a hydrogen energy conveying pipeline Lq.
Preferably, the exhaust port of the gasification furnace 4 is communicated with the sintering cover 1 through a hydrogen energy conveying pipeline Lq, and the system further comprises: and the gas inlet 5 is arranged on the upper end and/or the side wall of the sintering cover 1 and communicated with the inside of the microwave heating area 101, and the gas inlet 5 is communicated with the hydrogen energy conveying pipeline Lq.
Preferably, the system further comprises: the booster pump 6 and the dust removal device 7 are arranged, and the booster pump 6 is arranged on the air suction pipeline Lc; the dust removing device 7 is provided on the suction duct Lc upstream of the booster pump 6.
Preferably, the system further comprises: a fuel regulating valve 8 and a temperature sensor 9, wherein the fuel regulating valve 8 is arranged on the hydrogen energy conveying pipeline Lq; the temperature sensor 9 is disposed inside the sintering cover 1.
Preferably, the bypass outlet 801 of the fuel regulating valve 8 communicates with the integrated fuel line Lz.
Preferably, the comprehensive fuel pipeline Lz is connected to a combustion-supporting gas preheating system, a sintering mineral aggregate drying and preheating system or an activated carbon desorption tower heating system.
Preferably, the system further comprises: and the air guide holes 102 are formed in the upper end and/or the side wall of the sintering cover 1, and the air guide holes 102 are formed in the side wall.
Preferably, the system further comprises: and the microwave suppressors 10 are arranged at the feeding end and the discharging end of the sintering cover 1, and the microwave suppressors 10 are arranged at the discharging end and the discharging end of the sintering cover 1.
Example 1
A hydrogen energy medium combined microwave sintering method comprises the following steps: 1) preparing a sintering material: mixing iron ore, solid fuel and flux to prepare a material to be sintered; 2) heating the material to be sintered: distributing materials to be sintered on a sintering machine, and feeding the materials to be sintered into a microwave heating area of the sintering machine; heating the material to be sintered by a microwave heating zone to start sintering, wherein the material to be sintered generates tail gas containing carbon dioxide and water vapor in the sintering process; 3) preparing a hydrogen energy medium: introducing the tail gas containing carbon dioxide and water vapor generated in the step 2) into a gasification furnace 4 as a gasification agent, and reacting the carbon dioxide and the water vapor with the coal to be gasified in the gasification furnace 4 to generate CO and H2，CO、H2Is a hydrogen energy medium; 4) introducing the hydrogen energy medium generated in the step 3) into a microwave heating area of a sintering machine, and sintering the material to be sintered by combining the hydrogen energy medium with microwave heating; tail gas containing carbon dioxide and water vapor generated in the sintering process is continuously conveyed into the gasification furnace 4, and the circulation is carried out; 5) and obtaining the sinter after sintering the sintering material.
Example 2
Example 1 was repeated except that in step 3), the off-gas containing carbon dioxide and steam was reacted with the coal to be gasified to produce CO, H2Specifically, the equation for the reaction of the tail gas containing carbon dioxide and water vapor with the coal to be gasified is as follows:
C+H2O＝CO+H2——131KJ/mol (1)
C+CO2＝2CO——172KJ/mol (2)
wherein, the two reactions are endothermic reactions, the reaction temperature T is 1100-1600 ℃, and the reaction pressure P is 2.5-10 MPa.
Example 3
Example 2 is repeated except that in step 3), the tail gas containing carbon dioxide and water vapor in step 2) is introduced into the gasification furnace 4 as a gasification agent, specifically: extracting part of sintering flue gas from a flue 301 of the sintering machine 3, and removing dust in the flue gas through a flue gas dust removal device to obtain tail gas containing carbon dioxide and water vapor; and then introducing the tail gas containing carbon dioxide and water vapor into the gasification furnace 4.
Example 4
Example 3 was repeated except that the off-gas containing carbon dioxide and water vapor was pumped into the gasification furnace 4 by the booster pump 6.
Example 5
Example 4 was repeated except that step 1) further included the steps of: and drying and preheating the material to be sintered.
Example 6
Example 5 is repeated except that in step 4), the material to be sintered is dried and preheated by using the hydrogen energy medium. The step 4) also comprises the following steps: and introducing combustion-supporting gas into the microwave sintering area 101.
Example 7
Example 6 was repeated except that the combustion-supporting gas was air, pure oxygen gas or oxygen-enriched gas.
Example 8
Example 7 was repeated except that step 4) further included the steps of: detecting the combustion temperature Q of the sintering material in the microwave sintering zone 101rsIf combustion temperature QrsIf the temperature is less than 1200 ℃, the supply amount of the hydrogen energy medium and the combustion-supporting gas is increased; if the combustion temperature QrsThe temperature is more than or equal to 1200 ℃, so that the supply amount of the hydrogen energy medium and the combustion-supporting gas is reduced.
Example 9
Example 8 is repeated except that step 2) further comprises the steps of: a microwave suppressor 10 is provided upstream and/or downstream of the microwave sintering zone 101.
Example 10
Example 9 was repeated except that in step 3), the coal to be gasified was high-hydrogen low-quality coal. In the step 1), the solid fuel is bituminous coal.
Example 11
A sintering heating system to which the first embodiment is applied, the system comprising: the device comprises a sintering cover 1, a microwave sintering area 101, a microwave heating device 2, a sintering machine 3, a flue 301 and a gasification furnace 4; the sintering cover 1 is arranged above the sintering machine 3, and the microwave sintering area 101 is arranged in the sintering cover 1; the microwave heating device 2 is arranged on the upper end and/or the side wall of the sintering cover 1 and is communicated with the microwave heating area 101; a flue 301 of the sintering machine 3 is connected to the gasification furnace 4 through an air suction pipeline Lc; an exhaust port of the gasification furnace 4 is communicated to the sintering cover 1 through a hydrogen energy conveying pipeline Lq.
Example 12
Example 11 is repeated, except that the exhaust port of the gasification furnace 4 is communicated into the sintering cover 1 through a hydrogen energy conveying pipeline Lq, specifically, the system further comprises: and the gas inlet 5 is arranged on the upper end and/or the side wall of the sintering cover 1 and is communicated with the inside of the microwave heating area 101, and a fuel port of the gas inlet 5 is communicated with the hydrogen energy conveying pipeline Lq.
Example 13
Example 12 is repeated except that the system further comprises: and the combustion-supporting gas source 6 is communicated with the combustion-supporting gas port of the gas inlet 5.
Example 14
Example 13 is repeated except that the system further comprises: the booster pump 6 and the dust removal device 7 are arranged, and the booster pump 6 is arranged on the air suction pipeline Lc; the dust removing device 7 is provided on the suction duct Lc upstream of the booster pump 6.
Example 15
Example 14 is repeated except that the system further comprises: a fuel regulating valve 8 and a temperature sensor 9, wherein the fuel regulating valve 8 is arranged on the hydrogen energy conveying pipeline Lq; the temperature sensor 9 is disposed inside the sintering cover 1.
Example 16
Embodiment 15 is repeated except that the bypass outlet 801 of the fuel regulating valve 8 communicates with the integrated fuel line Lz.
Example 17
Example 16 was repeated except that the integrated fuel line Lz was connected to a combustion-supporting gas preheating system, a sintered ore drying preheating system or an activated carbon desorption tower heating system.
Example 18
Example 17 was repeated except that the system further included: and the air guide holes 102 are formed in the upper end and/or the side wall of the sintering cover 1, and the air guide holes 102 are formed in the side wall.
Example 19
Example 18 is repeated except that the system further comprises: and the microwave suppressors 10 are arranged at the feeding end and the discharging end of the sintering cover 1, and the microwave suppressors 10 are arranged at the discharging end and the discharging end of the sintering cover 1.
Example 20
According to a conventional sintering method: 1) preparing a sintering material, namely mixing iron ore, solid fuel (adopting anthracite) and flux (adopting quicklime) to prepare the material to be sintered; 2) heating the material to be sintered, distributing the material to be sintered on a sintering machine, and igniting the material to be sintered in a sintering area for sintering. 3) And obtaining the sinter after sintering the sintering material. The sintered ore obtained was tested and compared with the sintered ore obtained in example 1. Compared with the conventional sintering method, the sintered ore obtained in the example 1 has the advantages that the yield, the drum strength and the average particle size are respectively improved by 3 percent, 4 percent and 2 percent, and the external discharge of waste gas is reduced by more than 95 percent. Considering the cost comprehensively, the cost of the hydrogen energy medium combined microwave sintering method in the embodiment 1 can be effectively reduced compared with the conventional sintering method, and the cost is about 20 yuan per ton of sintering ore (static cost including pollutant treatment cost, sintering processing cost, waste heat and residual energy utilization cost and the like).
Claims (10)
1. A hydrogen energy medium combined microwave sintering method is characterized by comprising the following steps:
1) preparing a sintering material: mixing iron ore, solid fuel and flux to prepare a material to be sintered;
2) heating the material to be sintered: distributing materials to be sintered on a sintering machine, and feeding the materials to be sintered into a microwave heating area of the sintering machine; heating the material to be sintered by a microwave heating zone to start sintering, wherein the material to be sintered generates tail gas containing carbon dioxide and water vapor in the sintering process;
3) preparing a hydrogen energy medium: subjecting the product of the step 2) to a reaction to produce a compound containing twoTail gas of carbon oxide and steam is introduced into the gasification furnace (4) as a gasification agent, and the carbon dioxide and the steam react with coal to be gasified in the gasification furnace (4) to generate CO and H2，CO、H2Is a hydrogen energy medium;
4) introducing the hydrogen energy medium generated in the step 3) into a microwave heating area of a sintering machine, and sintering the material to be sintered by combining the hydrogen energy medium with microwave heating; tail gas containing carbon dioxide and water vapor generated in the sintering process is continuously conveyed into the gasification furnace (4), and the circulation is carried out;
5) and obtaining the sinter after sintering the sintering material.
2. The combined microwave sintering method for hydrogen energy medium as claimed in claim 1, wherein in step 3), the tail gas containing carbon dioxide and water vapor reacts with the coal to be gasified to generate CO and H2Specifically, the equation for the reaction of the tail gas containing carbon dioxide and water vapor with the coal to be gasified is as follows:
C+H2O＝CO+H2——131KJ/mol (1)
C+CO2＝2CO——172KJ/mol (2)
wherein, the two reactions are endothermic reactions, the reaction temperature T is 1100-1600 ℃, and the reaction pressure P is 2.5-10 MPa.
3. The hydrogen energy medium combined microwave sintering method according to claim 2, wherein in the step 3), the tail gas containing carbon dioxide and water vapor in the step 2) is introduced into the gasification furnace (4) as a gasification agent, and specifically comprises: extracting sintering flue gas from a flue (301) of the sintering machine (3), and removing dust in the flue gas through a flue gas dust removal device to obtain tail gas containing carbon dioxide and water vapor; then introducing tail gas containing carbon dioxide and water vapor into the gasification furnace (4); preferably, the off-gas containing carbon dioxide and water vapor is pumped into the gasification furnace (4) by a booster pump (6).
4. The combined microwave sintering method for hydrogen energy media as claimed in any one of claims 1 to 3, wherein the step 1) further comprises the steps of: drying and preheating the material to be sintered; preferably, in the step 4), the material to be sintered is dried and preheated by utilizing a hydrogen energy medium; and/or
The step 4) also comprises the following steps: introducing combustion-supporting gas into the microwave sintering zone; preferably, the combustion-supporting gas is air, pure oxygen gas or oxygen-enriched gas.
5. The combined microwave sintering method for hydrogen energy media as claimed in any one of claims 1 to 4, wherein the step 4) further comprises the steps of: detecting the combustion temperature Q of the material to be sintered in the microwave sintering zonersIf combustion temperature QrsIf the temperature is less than 1200 ℃, the supply amount of the hydrogen energy medium and the combustion-supporting gas is increased; if the combustion temperature QrsThe temperature is more than or equal to 1200 ℃, so that the supply amount of the hydrogen energy medium and the combustion-supporting gas is reduced.
6. The combined microwave sintering method for hydrogen energy media as claimed in any one of claims 1 to 5, wherein the step 2) further comprises the steps of: arranging a microwave suppressor (10) upstream and/or downstream of the microwave sintering zone; and/or
In the step 3), the coal to be gasified is high-hydrogen low-quality coal (such as lignite); preferably, in step 1), the solid fuel is high-hydrogen coal (high-quality high-volatile coal such as bituminous coal).
7. A sintering heating system using the hydrogen energy medium combined microwave sintering method of any one of claims 1 to 6, characterized in that the system comprises: the device comprises a sintering cover (1), a microwave heating zone (101), a microwave heating device (2), a sintering machine (3), a flue (301) and a gasification furnace (4); the sintering cover (1) is arranged above the sintering machine (3), and the microwave heating area (101) is arranged in the sintering cover (1); the microwave heating device (2) is arranged on the upper end and/or the side wall of the sintering cover (1) and is communicated with the microwave heating area (101); a flue (301) of the sintering machine (3) is connected into the gasification furnace (4) through an air suction pipeline (Lc); an exhaust port of the gasification furnace (4) is communicated to the sintering cover (1) through a hydrogen energy conveying pipeline (Lq).
8. The sintering heating system according to claim 7, wherein the exhaust port of the gasification furnace (4) is communicated into the sintering cover (1) through a hydrogen energy conveying pipeline (Lq), and the system further comprises: the gas inlet (5) is arranged at the upper end and/or the side wall of the sintering cover (1) and communicated with the inside of the microwave heating area (101), and the gas inlet (5) is communicated with the hydrogen energy conveying pipeline (Lq).
9. Sintering heating system according to claim 7 or 8, characterized in that the system further comprises: the air conditioner comprises a booster pump (6) and a dust removal device (7), wherein the booster pump (6) is arranged on an air suction pipeline (Lc); the dust removal device (7) is arranged on an air suction pipeline (Lc) at the upstream of the booster pump (6); and/or
The system further comprises: the fuel regulating valve (8) and the temperature sensor (9), wherein the fuel regulating valve (8) is arranged on the hydrogen energy conveying pipeline (Lq); the temperature sensor (9) is arranged on the inner side of the sintering cover (1); preferably, the bypass outlet (801) of the fuel regulating valve (8) is communicated with the comprehensive fuel pipeline (Lz); preferably, the integrated fuel pipeline (Lz) is connected to a combustion-supporting gas preheating system, a sintering mineral aggregate drying and preheating system or an activated carbon desorption tower heating system.
10. The sintering heating system of any of claims 7-9, further comprising: the air guide holes (102), the air guide holes (102) are arranged on the upper end and/or the side wall of the sintering cover (1); and/or
The system further comprises: the microwave suppressor (10), the microwave suppressor (10) sets up in the feed end of sintering cover (1) and discharge end play.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113666767A (en) * | 2021-08-20 | 2021-11-19 | 新疆凯盛建材设计研究院（有限公司） | Method and system for statically sintering ceramsite by microwave |
| CN114250357A (en) * | 2020-09-22 | 2022-03-29 | 中冶长天国际工程有限责任公司 | High-hydrogen low-carbon sinter bed structure, sintering system and method |
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2020
- 2020-02-27 CN CN202010122185.9A patent/CN112410546A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114250357A (en) * | 2020-09-22 | 2022-03-29 | 中冶长天国际工程有限责任公司 | High-hydrogen low-carbon sinter bed structure, sintering system and method |
| CN113666767A (en) * | 2021-08-20 | 2021-11-19 | 新疆凯盛建材设计研究院（有限公司） | Method and system for statically sintering ceramsite by microwave |
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