A hydrogen medium combined microwave sintering method and sintering heating system

Abstract

A hydrogen medium combined with microwave sintering method and sintering heating system, comprising the following steps: 1) preparing sintering materials: mixing iron ore, solid fuel and flux to prepare materials to be sintered; 2) heating materials to be sintered: the materials to be sintered enter a microwave sintering zone, igniting the materials to be sintered by microwaves, and burning the materials to be sintered to produce carbon dioxide and water vapor; 3) preparing hydrogen medium: introducing the carbon dioxide and water vapor in the above step 2) into a gasifier as gasifying agents, reacting with coal to be gasified to produce CO and H 2 ; 4) passing the hydrogen energy medium generated in step 3) into the microwave sintering zone to burn and heat the material to be sintered; 5) the material to be sintered is sintered to obtain sintered ore. The present application utilizes the carbon dioxide and water vapor generated during the sintering process to pass into the gasifier to react with high-hydrogen low-quality coal, and then passes the generated water gas into the sintering hood for combustion, thereby increasing the combustion temperature of the material to be sintered, improving the sintering effect, and saving energy consumption.

Description

Technical Field

[0001] The invention relates to a sintering method, in particular to a hydrogen medium combined with microwave sintering method, belonging to the technical field of mineral sintering; the invention also relates to a sintering heating system. Background Art

[0002] The steel industry is a typical energy-intensive sector, and its energy consumption is as high as 10% to 15% of the world's energy consumption. Sintering is the front-end process of the steel industry, and its energy consumption ranks second in the steel industry. The combustion of solid fuels during the sintering process is also an atmospheric pollutant NO in the steel industry. x , CO x The main source of emissions, SO x In addition, sintered ore accounts for more than 70% of the ironmaking materials in blast furnaces, and the quality of sintered ore is closely related to the stable and smooth operation, high efficiency, low consumption and large coal injection technology of large blast furnaces.

[0003] The low temperature, large volume, high pollutant content and complex composition of sintering waste gas are the difficulties and key points of low-temperature waste heat utilization and waste gas treatment in the steel industry. Sintering waste gas recycling can not only significantly reduce the total amount of waste gas emissions and pollutant emissions in the sintering process, but also recover the low-temperature waste heat in the flue gas and save energy consumption in the sintering process, which has great value in energy conservation, emission reduction and promotion and application.

[0004] Therefore, how to provide a hydrogen medium combined with 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 energy consumption, and realize green, efficient and low-consumption sintering production is a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0005] In view of the above-mentioned deficiencies of the prior art, the present invention aims to utilize the carbon dioxide and water vapor generated during the sintering process to pass into the gasifier to react with high-hydrogen low-quality coal, and to generate water gas (CO, H 2) and then passed into the sintering hood for combustion, thereby increasing the combustion temperature of the material to be sintered, improving the sintering effect and saving energy consumption. The invention provides a hydrogen medium combined with microwave sintering method, which comprises the following steps: 1) preparing sintering materials: mixing iron ore, solid fuel and flux to prepare materials to be sintered; 2) heating materials to be sintered: placing materials to be sintered on a sintering machine, and the materials to be sintered enter the microwave heating zone of the sintering machine; the materials to be sintered are heated in the microwave heating zone and start sintering, and the materials to be sintered generate tail gas containing carbon dioxide and water vapor during the sintering process; 3) preparing hydrogen medium: the tail gas containing carbon dioxide and water vapor generated in the above step 2) is introduced into a gasifier as a gasifying agent, and the carbon dioxide and water vapor react with the coal to be gasified in the gasifier to generate CO and H2, and CO and H2 are hydrogen medium; 4) the hydrogen medium generated in step 3) is introduced into the microwave heating zone of the sintering machine, and the materials to be sintered are sintered by the hydrogen medium combined with microwave heating; the tail gas containing carbon dioxide and water vapor generated in the sintering process is continuously transported to the gasifier, and the cycle is repeated; 5) the sintering of the materials to be sintered is completed to obtain sintered ore.

[0006] According to a first embodiment of the present invention, a hydrogen medium combined microwave sintering method is provided:

[0007] A hydrogen medium combined with microwave sintering method, the method comprising the following steps: 1) preparing sintering materials: mixing iron ore, solid fuel and flux to prepare materials to be sintered; 2) heating materials to be sintered: placing materials to be sintered on a sintering machine, and the materials to be sintered enter the microwave heating zone of the sintering machine; the materials to be sintered are heated in the microwave heating zone to start sintering, and the materials to be sintered generate tail gas containing carbon dioxide and water vapor during the sintering process; 3) preparing hydrogen medium: introducing the tail gas containing carbon dioxide and water vapor generated in the above step 2) into a gasifier as a gasifying agent, and the carbon dioxide and water vapor react with the coal to be gasified in the gasifier to generate CO, H 2 , CO, H 2 The hydrogen energy medium is a hydrogen energy medium; 4) the hydrogen energy medium generated in step 3) is introduced into the microwave heating zone of the sintering machine, and the hydrogen energy medium is combined with microwave heating to sinter the sintered material; the tail gas containing carbon dioxide and water vapor generated during the sintering process is continuously transported to the gasification furnace, and the cycle is repeated; 5) the sintering of the sintered material is completed to obtain the sintered ore.

[0008] Preferably, in step 3), the tail gas containing carbon dioxide and water vapor reacts with the coal to be gasified to produce CO, H 2 Specifically, the equation for the reaction between the tail gas containing carbon dioxide and water vapor and the coal to be gasified is:

[0009] C+H 2 O=CO+H 2 ——131KJ / mol (1)

[0010] C+CO 2 =2CO——172KJ / mol (2)

[0011] Wherein, the two reactions are endothermic reactions, the reaction temperature T is 1100-1600°C, preferably 1150-1500°C; the reaction pressure P is 2.5-10MPa, preferably the reaction pressure P is 3.0-80MPa.

[0012] Preferably, in step 3), the tail gas containing carbon dioxide and water vapor in the above step 2) is introduced into the gasifier as a gasifying agent. Specifically, the sintering flue gas is extracted from the flue of the sintering machine, and the dust in the flue gas is removed by a flue gas dust removal device to obtain the tail gas containing carbon dioxide and water vapor; and then the tail gas containing carbon dioxide and water vapor is introduced into the gasifier.

[0013] Preferably, the tail gas containing carbon dioxide and water vapor is pumped into the gasifier by a booster pump.

[0014] Preferably, step 1) further comprises the step of drying and preheating the material to be sintered.

[0015] Preferably, in step 4), hydrogen energy medium is used to dry and preheat the material to be sintered.

[0016] Preferably, step 4) further comprises the step of: introducing a combustion-supporting gas into the microwave sintering zone.

[0017] Preferably, the combustion-supporting gas is air, pure oxygen gas or oxygen-enriched gas.

[0018] Preferably, step 4) further comprises the step of detecting the combustion temperature Q of the sintering material in the microwave sintering zone. rs , if the combustion temperature Q rs <1200℃, increase the supply of hydrogen medium and combustion-supporting gas; if the combustion temperature Q rs ≥1200℃, reduce the supply of hydrogen medium and combustion-supporting gas.

[0019] Preferably, step 2) further comprises the step of: arranging a microwave suppressor upstream and / or downstream of the microwave sintering zone.

[0020] Preferably, in step 3), the coal to be gasified is high-hydrogen and low-quality coal (such as lignite, high-sulfur coal, high-ash coal, sub-bituminous coal, lean coal, etc.).

[0021] Preferably, in step 1), the solid fuel is high-hydrogen coal, preferably high-hydrogen high-quality coal (such as bituminous coal, long flame coal, non-caking coal, weakly caking coal and other high-quality high-volatile coal).

[0022] According to a second embodiment of the present invention, a sintering heating system is provided:

[0023] A sintering heating system using the first implementation scheme comprises: a sintering hood, a microwave heating zone, a microwave heating device, a sintering machine, a flue, and a gasifier; the sintering hood is arranged above the sintering machine, and the microwave heating zone is inside the sintering hood; the microwave heating device is arranged on the upper end and / or the side wall of the sintering hood and is connected to the microwave heating zone; the flue of the sintering machine is connected to the gasifier through an exhaust duct; the exhaust port of the gasifier is connected to the sintering hood through a hydrogen energy delivery pipeline.

[0024] Preferably, the exhaust port of the gasifier is connected to the sintering hood through a hydrogen energy delivery pipeline. Specifically, the system also includes: an air inlet, which is arranged on the upper end and / or side wall of the sintering hood and is connected to the interior of the microwave heating zone, and the air inlet is connected to the hydrogen energy delivery pipeline.

[0025] Preferably, the system further comprises: a booster pump and a dust removal device, wherein the booster pump is arranged on the exhaust duct; and the dust removal device is arranged on the exhaust duct upstream of the booster pump.

[0026] Preferably, the system further comprises: a fuel regulating valve and a temperature sensor, wherein the fuel regulating valve is arranged on the hydrogen energy delivery pipeline; and the temperature sensor is arranged on the inner side of the sintering hood.

[0027] Preferably, the bypass outlet of the fuel regulating valve is connected to the integrated fuel pipeline.

[0028] Preferably, the integrated fuel pipeline is connected to the combustion-supporting gas preheating system, the sintered ore drying preheating system or the activated carbon analysis tower heating system.

[0029] Preferably, the system further comprises: air guide holes, which are arranged on the upper end and / or the side wall of the sintering hood.

[0030] Preferably, the system further comprises: a microwave suppressor, which is arranged at the feed end and the discharge end of the sintering hood.

[0031] In the first embodiment of the present application, in order to make the iron ore burn fully, the iron ore and solid fuel are made into the form of materials to be sintered, the combustion area of ​​the iron ore is increased, and the distance between the iron ore and the combustion flame is reduced, thereby improving the sintering effect. At the same time, a microwave heating device is used to heat the sintering material to improve the combustion efficiency of the material to be sintered and the production and quality indicators of the sintered ore. After the solid fuel is burned, a large amount of carbon dioxide and water vapor high-temperature gas is generated. This part of the carbon dioxide and water vapor high-temperature gas is introduced into the gasifier to react with the coal to be gasified to generate combustible gas, which includes: CO, H 2; These gases are also called hydrogen energy media. The generated hydrogen energy medium is then introduced into the microwave sintering zone to heat and ignite the material to be sintered, thereby increasing the ignition speed of the material to be sintered, increasing the ignition speed of the microwave sintering zone, and increasing the overall production speed. In the prior art, the chemical reaction in the gasifier needs to be carried out under high temperature and high pressure. Generally, in a gasifier, when the temperature is lowered and the pressure is insufficient, oxygen will be introduced into the gasifier to cause the coal to be gasified to burn, thereby increasing the temperature and air pressure in the furnace. The solution provided in the present application creatively utilizes the high-temperature gases of carbon dioxide and water vapor generated during the sintering process to be introduced into the gasifier to react with the coal to be gasified, so that the gasifier does not need to introduce additional air or oxygen, thereby realizing that the coal to be gasified is only used for gasification reaction, and there is no need to burn to increase the temperature in the furnace. Improve the utilization rate of the coal to be gasified.

[0032] It should be noted that in the prior art, in order to increase the temperature and pressure of the gasifier, air or oxygen is introduced into the gasifier, so that the high-hydrogen coal (lignite, high-sulfur coal, high-ash coal, sub-bituminous coal, lean coal and other high-quality high-volatile coal) in the gasifier undergoes an oxidation-reduction reaction with the previously generated hydrogen energy medium to generate carbon dioxide and water vapor. In this application, carbon dioxide and water vapor are generated by the combustion of the material to be sintered, and the gasifier does not need to be introduced with air or oxygen for combustion, which reduces the working process of the gasifier, improves the efficiency of the gasifier, and thus improves the overall production efficiency.

[0033] It should be noted that microwave, as a means of heating, has the characteristics of selective heating, rapid heating, volumetric heating, instant heating, activation of metallurgical chemical reactions, and cleanliness; it can quickly increase the temperature of materials and accelerate chemical reactions; microwaves act directly on the material body through wave-transparent materials, reducing conduction heat losses; microwave heating itself does not produce gas, reducing exhaust gas emissions, thereby achieving the goal of energy conservation and emission reduction.

[0034] In the first embodiment of the present application, the reaction occurring in the gasifier is an endothermic reaction. The reaction equation is as follows:

[0035] C+H 2 O=CO+H 2 ——131KJ / mol (1)

[0036] C+CO 2 =2CO——172KJ / mol (2)

[0037] By controlling the working conditions in the gasifier, the reaction is guided. Due to the high-temperature carbon dioxide and water vapor introduced into the sintering flue, only the above two reactions occur in the high-hydrogen coal (bituminous coal, long flame coal, non-caking coal, weakly caking coal and other high-quality high-volatile coal). The purity of the reaction products in the gasifier is improved.

[0038] In the first embodiment of the present application, the flue gas generated after the combustion of the material to be sintered enters the flue under the material surface of the sintering machine under the action of negative pressure. The flue gas in the flue is extracted by setting an exhaust duct. After the extracted flue gas passes through a dust removal device to remove dust, a high-temperature gas of carbon dioxide and water vapor can be obtained. The purity of the high-temperature gas provided to the gasifier can be improved. If the flue gas is directly introduced into the gasifier, due to the presence of a large amount of dust in the flue gas, other reactions will occur in the gasifier, thereby affecting the purity of the product of the gasifier.

[0039] 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 entering the gasifier.

[0040] In the first embodiment of the present application, the hydrogen energy medium generated in the gasifier can be used to heat the material to be sintered in the microwave sintering zone, but if the combustion temperature of the material to be sintered reaches the standard, the excess hydrogen energy medium can also be used to dry and preheat the material to be sintered in step 1). That is, the extra hydrogen energy medium generated in the gasifier can also be used for other heating links in the production of the enterprise.

[0041] In the first embodiment of the present application, a combustion-supporting gas is introduced into the microwave sintering zone to fully burn the material to be sintered. Specifically, the combustion-supporting gas is introduced into the microwave sintering zone in two ways. The first is to introduce the combustion-supporting gas at the air inlet so that the combustion-supporting gas is mixed with the hydrogen medium before combustion. The second is to provide an air guide hole on the sintering hood so that external air enters the microwave sintering zone from the air guide hole to participate in the combustion.

[0042] In the first embodiment of the present application, by detecting the combustion temperature of the material to be sintered in the microwave sintering zone, the supply amount of hydrogen energy medium and combustion-supporting gas is determined, so that the material to be sintered can be controlled within a specified combustion temperature range to ensure the sintering quality.

[0043] In the first embodiment of the present application, microwaves are prevented from diffusing to the outside by arranging microwave suppressors upstream and downstream of the microwave sintering zone.

[0044] 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 (bituminous coal, long flame coal, non-sticky coal, weakly sticky coal and other high-quality, high-volatile coal). In the actual production process, when steel production enterprises purchase coal from coal production enterprises, they will purchase coal of different qualities. High-quality coal suitable for combustion can be used as solid fuel, and coal with low calorific value but containing a large amount of biomass can be used for gasification to produce high-purity hydrogen energy medium to assist combustion. In this way, corresponding production strategies can be formulated for different types of coal, and the rational use of coal resources has been achieved.

[0045] In the second embodiment of the present application, the flue of the sintering machine is connected to the gasifier through an exhaust duct, and the exhaust port of the gasifier is connected to the sintering hood through a hydrogen delivery duct. The carbon dioxide and water vapor high-temperature gas generated by sintering are used to participate in the gasification reaction in the gasifier to produce hydrogen energy medium, and then the hydrogen energy medium is introduced into the microwave sintering zone in the sintering hood to burn and heat the material to be sintered. At the same time, the microwave heating device is used to heat the sintered material to improve the combustion efficiency of the material to be sintered. The combustion temperature of the material to be sintered is increased, the sintering effect is improved, and energy consumption is saved.

[0046] In the second embodiment of the present application, the hydrogen medium is sprayed into the microwave sintering zone through the air inlet, which can increase the length of the flame, so that the flame generated by the combustion of the hydrogen medium contacts the material to be sintered, thereby improving the sintering effect. The air inlet is also provided with a combustion-supporting gas port for receiving the combustion-supporting gas, so that the hydrogen medium and the combustion-supporting gas are fully mixed in the air inlet before being sprayed out for combustion.

[0047] In the second embodiment of the present application, dust in the flue gas in the exhaust duct is removed by a dust removal device to improve the purity of the high-temperature gas. At the same time, a booster pump is used to assist the high-temperature exhaust gas.

[0048] In the second embodiment of the present application, the combustion temperature of the material to be sintered is controlled in real time by cooperating with the fuel regulating valve and the temperature sensor, and the fuel regulating valve is adjusted according to the monitored temperature data, thereby adjusting the injection amount of the hydrogen energy medium. In addition, the fuel regulating valve can also introduce the hydrogen energy medium into the integrated fuel pipeline through the bypass outlet for other applications.

[0049] In the second embodiment of the present application, air is added into the sintering hood through the air guide holes; and microwave leakage is suppressed by the microwave suppressor.

[0050] It should be further explained that the purpose of the present invention is to provide a sintering method that can effectively save energy and reduce emissions. The method uses microwaves for sintering and makes full use of tail gas. According to the coal gasification reaction, the sintering tail gas is introduced into the gasification furnace for reaction to obtain clean hydrocarbon compounds and other hydrogen energy media, which then enter the microwave sintering zone to achieve hydrogen energy medium combined with microwave sintering. Compared with traditional sintering processes, it has broad prospects for promotion and application and is beneficial to the green development of the steel industry.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] 1. The technical solution provided by this application can reasonably reduce the consumption of solid fuel and obtain uniform heat and homogeneous sintering;

[0053] 2. The technical solution provided in this application can significantly improve the output and quality indicators of sintered ore;

[0054] 3. The technical solution provided in this application can greatly reduce COx, SOx and NOx emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a flow chart of the hydrogen medium combined microwave sintering method according to an embodiment of the present invention;

[0056] Figure 2 It is a schematic structural diagram of a sintering heating system according to an embodiment of the present invention.

[0057] Reference numerals:

[0058] 1: sintering hood; 101: microwave sintering area; 102: air guide hole; 2: microwave heating device; 3: sintering machine; 301: flue; 4: gasification furnace; 5: air inlet; 6: booster pump; 7: dust removal device; 8: fuel regulating valve; 801: bypass outlet; 9: temperature sensor; 10: microwave suppressor;

[0059] Lc: exhaust duct; Lq: hydrogen energy transmission pipeline; Lz: fuel pipeline. DETAILED DESCRIPTION

[0060] According to a first embodiment of the present invention, a hydrogen medium combined microwave sintering method is provided:

[0061] A hydrogen medium combined with microwave sintering method, the method comprising the following steps: 1) preparing sintering materials: mixing iron ore, solid fuel and flux to prepare materials to be sintered; 2) heating materials to be sintered: placing materials to be sintered on a sintering machine, and the materials to be sintered enter the microwave heating zone of the sintering machine; the materials to be sintered are heated in the microwave heating zone and begin to sinter, and the materials to be sintered generate tail gas containing carbon dioxide and water vapor during the sintering process; 3) preparing hydrogen medium: introducing the tail gas containing carbon dioxide and water vapor generated in the above step 2) into a gasifier 4 as a gasifying agent, and the carbon dioxide and water vapor react with the coal to be gasified in the gasifier 4 to generate CO, H 2 , CO, H 2 The hydrogen energy medium is a hydrogen energy medium; 4) the hydrogen energy medium generated in step 3) is introduced into the microwave heating zone of the sintering machine, and the hydrogen energy medium is combined with microwave heating to sinter the sintered material; the tail gas containing carbon dioxide and water vapor generated during the sintering process is continuously transported to the gasification furnace 4, and the cycle is repeated; 5) the sintering of the sintered material is completed to obtain the sintered ore.

[0062] Preferably, in step 3), the tail gas containing carbon dioxide and water vapor reacts with the coal to be gasified to produce CO, H 2 Specifically, the equation for the reaction between the tail gas containing carbon dioxide and water vapor and the coal to be gasified is:

[0063] C+H 2 O=CO+H2 ——131KJ / mol (1)

[0064] C+CO 2 =2CO——172KJ / mol (2)

[0065] Among them, the two reactions are endothermic reactions, the reaction temperature T is 1100-1600°C, and the reaction pressure P is 2.5-10MPa.

[0066] Preferably, in step 3), the tail gas containing carbon dioxide and water vapor in the above step 2) is introduced into the gasification furnace 4 as a gasifying agent. Specifically, the sintering flue gas is extracted from the flue 301 of the sintering machine 3, and the dust in the flue gas is removed by a flue gas dust removal device to obtain the tail gas containing carbon dioxide and water vapor; and then the tail gas containing carbon dioxide and water vapor is introduced into the gasification furnace 4.

[0067] Preferably, the tail gas containing carbon dioxide and water vapor is pumped into the gasifier 4 by the booster pump 6 .

[0068] Preferably, step 1) further comprises the step of drying and preheating the material to be sintered.

[0069] Preferably, in step 4), hydrogen energy medium is used to dry and preheat the material to be sintered.

[0070] Preferably, step 4) further comprises the step of: introducing a combustion-supporting gas into the microwave sintering zone.

[0071] Preferably, the combustion-supporting gas is air, pure oxygen gas or oxygen-enriched gas.

[0072] Preferably, step 4) further comprises the step of detecting the combustion temperature Q of the sintering material in the microwave sintering zone. rs , if the combustion temperature Q rs <1200℃, increase the supply of hydrogen medium and combustion-supporting gas; if the combustion temperature Q rs ≥1200℃, reduce the supply of hydrogen medium and combustion-supporting gas.

[0073] Preferably, step 2) further comprises the step of: arranging a microwave suppressor 10 upstream and / or downstream of the microwave sintering zone.

[0074] Preferably, in step 3), the coal to be gasified is high-hydrogen and low-quality coal (such as lignite, high-sulfur coal, high-ash coal, sub-bituminous coal, lean coal, etc.).

[0075] 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, etc.).

[0076] According to a second embodiment of the present invention, a sintering heating system is provided:

[0077] A sintering heating system using the first embodiment, the system comprising: a sintering hood 1, a microwave heating zone 101, a microwave heating device 2, a sintering machine 3, a flue 301, and a gasifier 4; the sintering hood 1 is arranged above the sintering machine 3, and the microwave heating zone 101 is inside the sintering hood 1; the microwave heating device 2 is arranged on the upper end and / or the side wall of the sintering hood 1 and is connected to the microwave heating zone 101; the flue 301 of the sintering machine 3 is connected to the gasifier 4 through an exhaust duct Lc; the exhaust port of the gasifier 4 is connected to the inside of the sintering hood 1 through a hydrogen energy delivery duct Lq.

[0078] Preferably, the exhaust port of the gasifier 4 is connected to the sintering hood 1 through the hydrogen energy delivery pipeline Lq. Specifically, the system also includes: an air inlet 5, which is arranged on the upper end and / or side wall of the sintering hood 1 and is connected to the interior of the microwave heating zone 101, and the air inlet 5 is connected to the hydrogen energy delivery pipeline Lq.

[0079] Preferably, the system further comprises: a booster pump 6 and a dust removal device 7, wherein the booster pump 6 is arranged on the exhaust duct Lc; and the dust removal device 7 is arranged on the exhaust duct Lc upstream of the booster pump 6.

[0080] 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 delivery pipeline Lq; and the temperature sensor 9 is arranged on the inner side of the sintering hood 1 .

[0081] Preferably, the bypass outlet 801 of the fuel regulating valve 8 is connected to the integrated fuel pipeline Lz.

[0082] Preferably, the integrated fuel pipeline Lz is connected to the combustion-supporting gas preheating system, the sintered ore drying preheating system or the activated carbon analysis tower heating system.

[0083] Preferably, the system further comprises: an air guide hole 102 , wherein the air guide hole 102 is arranged on the upper end and / or the side wall of the sintering hood 1 .

[0084] Preferably, the system further comprises: a microwave suppressor 10 , which is arranged at the feeding end and the discharging end of the sintering hood 1 .

[0085] Example 1

[0086] A hydrogen medium combined with microwave sintering method, the method comprising the following steps: 1) preparing sintering materials: mixing iron ore, solid fuel and flux to prepare materials to be sintered; 2) heating materials to be sintered: placing materials to be sintered on a sintering machine, and the materials to be sintered enter the microwave heating zone of the sintering machine; the materials to be sintered are heated in the microwave heating zone and begin to sinter, and the materials to be sintered generate tail gas containing carbon dioxide and water vapor during the sintering process; 3) preparing hydrogen medium: introducing the tail gas containing carbon dioxide and water vapor generated in the above step 2) into a gasifier 4 as a gasifying agent, and the carbon dioxide and water vapor react with the coal to be gasified in the gasifier 4 to generate CO, H 2 , CO, H 2 The hydrogen energy medium is a hydrogen energy medium; 4) the hydrogen energy medium generated in step 3) is introduced into the microwave heating zone of the sintering machine, and the hydrogen energy medium is combined with microwave heating to sinter the sintered material; the tail gas containing carbon dioxide and water vapor generated during the sintering process is continuously transported to the gasification furnace 4, and the cycle is repeated; 5) the sintering of the sintered material is completed to obtain the sintered ore.

[0087] Example 2

[0088] Example 1 was repeated, except that in step 3), the tail gas containing carbon dioxide and water vapor reacted with the coal to be gasified to produce CO, H 2 Specifically, the equation for the reaction between the tail gas containing carbon dioxide and water vapor and the coal to be gasified is:

[0089] C+H 2 O=CO+H 2 ——131KJ / mol (1)

[0090] C+CO 2 =2CO——172KJ / mol (2)

[0091] Among them, the two reactions are endothermic reactions, the reaction temperature T is 1100-1600°C, and the reaction pressure P is 2.5-10MPa.

[0092] Example 3

[0093] Example 2 is repeated, except that in step 3), the exhaust gas containing carbon dioxide and water vapor in the above step 2) is introduced into the gasifier 4 as a gasifying agent. Specifically, part of the sintering flue gas is extracted from the flue 301 of the sintering machine 3, and the dust in the flue gas is removed by a flue gas dust removal device to obtain the exhaust gas containing carbon dioxide and water vapor; and the exhaust gas containing carbon dioxide and water vapor is then introduced into the gasifier 4.

[0094] Example 4

[0095] Example 3 is repeated, except that the tail gas containing carbon dioxide and water vapor is pumped into the gasifier 4 by the booster pump 6.

[0096] Example 5

[0097] Example 4 is repeated, except that step 1) further includes the step of drying and preheating the material to be sintered.

[0098] Example 6

[0099] Example 5 is repeated, except that in step 4), hydrogen energy medium is used to dry and preheat the sintering material. Step 4) also includes the step of: introducing a combustion-supporting gas into the microwave sintering zone 101 .

[0100] Example 7

[0101] Example 6 was repeated except that the combustion-supporting gas was air, pure oxygen gas or oxygen-enriched gas.

[0102] Example 8

[0103] Repeat Example 7, except that step 4) further includes the step of detecting the combustion temperature Q of the sintering material in the microwave sintering zone 101. rs , if the combustion temperature Q rs <1200℃, increase the supply of hydrogen medium and combustion-supporting gas; if the combustion temperature Q rs ≥1200℃, reduce the supply of hydrogen medium and combustion-supporting gas.

[0104] Example 9

[0105] Example 8 is repeated, except that step 2) further includes the step of arranging a microwave suppressor 10 upstream and / or downstream of the microwave sintering zone 101 .

[0106] Example 10

[0107] Example 9 is repeated, except that in step 3), the coal to be gasified is high-hydrogen low-quality coal. In step 1), the solid fuel is bituminous coal.

[0108] Embodiment 11

[0109] A sintering heating system using the first embodiment, the system comprising: a sintering hood 1, a microwave sintering zone 101, a microwave heating device 2, a sintering machine 3, a flue 301, and a gasifier 4; the sintering hood 1 is arranged above the sintering machine 3, and the microwave sintering zone 101 is inside the sintering hood 1; the microwave heating device 2 is arranged on the upper end and / or the side wall of the sintering hood 1 and is connected to the microwave heating zone 101; the flue 301 of the sintering machine 3 is connected to the gasifier 4 through an exhaust duct Lc; the exhaust port of the gasifier 4 is connected to the inside of the sintering hood 1 through a hydrogen energy delivery duct Lq.

[0110] Example 12

[0111] Example 11 is repeated, except that the exhaust port of the gasifier 4 is connected to the sintering hood 1 through the hydrogen energy delivery pipeline Lq. Specifically, the system also includes: an air inlet 5, which is arranged on the upper end and / or the side wall of the sintering hood 1 and is connected to the interior of the microwave heating zone 101, and the fuel port of the air inlet 5 is connected to the hydrogen energy delivery pipeline Lq.

[0112] Example 13

[0113] Example 12 is repeated, except that the system further includes: a combustion-supporting gas source 6 , which is connected to the combustion-supporting gas port of the air inlet 5 .

[0114] Embodiment 14

[0115] Repeat Example 13, except that the system further includes: a booster pump 6 and a dust removal device 7, wherein the booster pump 6 is arranged on the exhaust duct Lc; and the dust removal device 7 is arranged on the exhaust duct Lc upstream of the booster pump 6.

[0116] Embodiment 15

[0117] Example 14 is repeated, except that the system further includes: a fuel regulating valve 8 and a temperature sensor 9 , wherein the fuel regulating valve 8 is arranged on the hydrogen energy delivery pipeline Lq; and the temperature sensor 9 is arranged on the inner side of the sintering hood 1 .

[0118] Example 16

[0119] Example 15 is repeated, except that the bypass outlet 801 of the fuel regulating valve 8 is connected to the integrated fuel pipeline Lz.

[0120] Embodiment 17

[0121] Repeat Example 16, except that the integrated fuel pipeline Lz is connected to the combustion-supporting gas preheating system, the sintered ore drying preheating system or the activated carbon analysis tower heating system.

[0122] Embodiment 18

[0123] Example 17 is repeated, except that the system further comprises: an air guide hole 102 , wherein the air guide hole 102 is arranged on the upper end and / or the side wall of the sintering hood 1 .

[0124] Embodiment 19

[0125] Example 18 is repeated, except that the system further comprises: a microwave suppressor 10 , wherein the microwave suppressor 10 is arranged at the feed end and the discharge end of the sintering hood 1 .

[0126] Embodiment 20

[0127] According to the conventional sintering method: 1) Preparation of sintering materials, iron ore, solid fuel (using anthracite), and flux (using quicklime) are mixed to form materials to be sintered; 2) The materials to be sintered are heated, the materials to be sintered are placed on the sintering machine, the materials to be sintered enter the sintering zone and are ignited for sintering. 3) The sintering of the materials to be sintered is completed to obtain sintered ore. The obtained sintered ore is tested and compared with the sintered ore obtained in Example 1. Compared with the conventional sintering method, the yield, drum strength, and average particle size of the sintered ore obtained in Example 1 are increased by 3%, 4%, and 2%, respectively, and the exhaust gas emission is reduced by more than 95%. Taking the cost into consideration, the hydrogen energy medium combined with microwave sintering method in Example 1 can effectively reduce the cost compared with the conventional sintering method, which is about 20 yuan / ton of sintered ore (including static costs such as pollutant control costs, sintering processing costs, and waste heat and waste energy utilization costs).

Claims

1. A hydrogen medium combined microwave sintering method, characterized in that: The method comprises the following steps: 1) Preparation of sintering materials: Mix iron ore, solid fuel and flux to prepare the material to be sintered; 2) Heating the material to be sintered: the material to be sintered is placed on the sintering machine, and the material to be sintered enters the microwave heating zone of the sintering machine; the material to be sintered is heated in the microwave heating zone and begins to sinter, and the material to be sintered generates tail gas containing carbon dioxide and water vapor during the sintering process; 3) Producing hydrogen energy medium: the tail gas containing carbon dioxide and water vapor produced in the above step 2) is introduced into the gasifier (4) as a gasifying agent, and the carbon dioxide and water vapor react with the coal to be gasified in the gasifier (4) to produce CO and H2, and CO and H2 are hydrogen energy medium; carbon dioxide and water vapor are produced by the combustion of the material to be sintered, and the gasifier does not need to be introduced with air or oxygen for combustion; 4) The hydrogen medium generated in step 3) is introduced into the microwave heating zone of the sintering machine, and the hydrogen medium is combined with the microwave to heat the material to be sintered to sinter; the tail gas containing carbon dioxide and water vapor generated during the sintering process is continuously transported to the gasification furnace (4), and the cycle is repeated; the combustion temperature Q of the material to be sintered in the microwave sintering zone is detected rs , if the combustion temperature Q rs <1200℃, increase the supply of hydrogen medium and combustion-supporting gas; if the combustion temperature Q rs ≥1200℃, reduce the supply of hydrogen medium and combustion-supporting gas; 5) After the sintering of the sintered materials is completed, sintered ore is obtained.

2. The hydrogen medium combined microwave sintering method according to claim 1, characterized in that: In step 3), the tail gas containing carbon dioxide and water vapor reacts with the coal to be gasified to produce CO and H2. Specifically, the equation for the reaction of the tail gas containing carbon dioxide and water vapor with the coal to be gasified is: C+H2O=CO+H2——131KJ / mol (1) C+CO2=2CO——172KJ / mol (2) Among them, the two reactions are endothermic reactions, the reaction temperature T is 1100-1600°C, and the reaction pressure P is 2.5-10MPa.

3. The hydrogen medium combined microwave sintering method according to claim 2, characterized in that: In step 3), the tail gas containing carbon dioxide and water vapor in the above step 2) is introduced into the gasification furnace (4) as a gasifying agent. Specifically, the sintering flue gas is extracted from the flue (301) of the sintering machine (3), and dust in the flue gas is removed by a flue gas dust removal device to obtain the tail gas containing carbon dioxide and water vapor; and the tail gas containing carbon dioxide and water vapor is then introduced into the gasification furnace (4).

4. The hydrogen medium combined microwave sintering method according to claim 3, characterized in that: The tail gas containing carbon dioxide and water vapor is pumped into the gasifier (4) by a booster pump (6).

5. The hydrogen medium combined microwave sintering method according to any one of claims 1 to 4, characterized in that: Step 1) further includes the steps of: drying and preheating the material to be sintered; and / or Step 4) also includes the step of: introducing a combustion-supporting gas into the microwave sintering zone.

6. The hydrogen medium combined microwave sintering method according to claim 5, characterized in that: In step 4), the sintering material is dried and preheated by using hydrogen energy medium; and / or The combustion-supporting gas is air, pure oxygen gas or oxygen-enriched gas.

7. The hydrogen medium combined microwave sintering method according to any one of claims 1 to 4 and 6, characterized in that: Step 2) further comprises the steps of: providing a microwave suppressor (10) upstream and / or downstream of the microwave sintering zone; and / or In step 3), the coal to be gasified is high-hydrogen low-quality coal.

8. The hydrogen medium combined microwave sintering method according to claim 5, characterized in that: Step 2) further comprises the steps of: providing a microwave suppressor (10) upstream and / or downstream of the microwave sintering zone; and / or In step 3), the coal to be gasified is high-hydrogen low-quality coal.

9. The hydrogen medium combined microwave sintering method according to claim 7, characterized in that: In step 1), the solid fuel is high-hydrogen coal.

10. The hydrogen medium combined microwave sintering method according to claim 8, characterized in that: In step 1), the solid fuel is high-hydrogen coal.

11. The hydrogen medium combined microwave sintering method according to any one of claims 1-4, 6, 8-10, characterized in that: The sintering heating system is adopted, and the system comprises: a sintering hood (1), a microwave heating zone (101), a microwave heating device (2), a sintering machine (3), a flue (301), and a gasifier (4); the sintering hood (1) is arranged above the sintering machine (3), and the microwave heating zone (101) is inside the sintering hood (1); the microwave heating device (2) is arranged on the upper end and / or the side wall of the sintering hood (1) and is connected to the microwave heating zone (101); the flue (301) of the sintering machine (3) is connected to the gasifier (4) through an exhaust duct (Lc); and the exhaust port of the gasifier (4) is connected to the inside of the sintering hood (1) through a hydrogen energy delivery duct (Lq).

12. The hydrogen medium combined microwave sintering method according to claim 11, characterized in that: The system further comprises: an air inlet (5), wherein the exhaust port of the gasifier (4) is connected to the inside of the sintering hood (1) via a hydrogen energy delivery pipeline (Lq); specifically, the air inlet (5) is arranged on the upper end and / or the side wall of the sintering hood (1) and is connected to the inside of the microwave heating zone (101); the air inlet (5) is connected to the hydrogen energy delivery pipeline (Lq).

13. The hydrogen medium combined microwave sintering method according to claim 12, characterized in that: The system further comprises: a booster pump (6) and a dust removal device (7), wherein the booster pump (6) is arranged on the exhaust duct (Lc); the dust removal device (7) is arranged on the exhaust duct (Lc) upstream of the booster pump (6); and / or The system further comprises: a fuel regulating valve (8) and a temperature sensor (9); the fuel regulating valve (8) is arranged on the hydrogen energy delivery pipeline (Lq); and the temperature sensor (9) is arranged on the inner side of the sintering hood (1).

14. The hydrogen medium combined microwave sintering method according to claim 13, characterized in that: The bypass outlet (801) of the fuel regulating valve (8) is in communication with the integrated fuel pipeline (Lz).

15. The hydrogen medium combined microwave sintering method according to claim 14, characterized in that: The integrated fuel pipeline (Lz) is connected to the combustion-supporting gas preheating system, the sintered ore drying preheating system or the activated carbon analysis tower heating system.

16. The hydrogen medium combined microwave sintering method according to claim 11, characterized in that: The system further comprises: an air guide hole (102), wherein the air guide hole (102) is arranged on the upper end and / or the side wall of the sintering hood (1); and / or The system further comprises: a microwave suppressor (10), wherein the microwave suppressor (10) is arranged at a feeding end and a discharging end of the sintering hood (1).

17. The hydrogen medium combined microwave sintering method according to any one of claims 12 to 16, characterized in that: The system further comprises: an air guide hole (102), wherein the air guide hole (102) is arranged on the upper end and / or the side wall of the sintering hood (1); and / or The system further comprises: a microwave suppressor (10), wherein the microwave suppressor (10) is arranged at a feeding end and a discharging end of the sintering hood (1).

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