Selective oxygen-enriched and steam-enriched hot air sintering system

Abstract

The utility model discloses a selective oxygen-enriched and steam-enriched hot air sintering system. The system comprises a hot air selective generating device, a sintering device, a cooling device and the like. According to the requirements of actual sintering working conditions, the ring cooling waste gas can be selectively converted into oxygen-enriched hot air and / or steam-enriched hot air and / or oxygen-enriched steam-enriched hot air which can be directly used for the sintering process through the hot air selective generation device, and high-quality steam, industrial hot water and the like are obtained in the conversion process. The waste heat recovery of the sintering ring cooling medium and low temperature waste gas is realized with low cost and high efficiency, the waste gas emission is obviously reduced, the quality of a sintered ore product is obviously improved, and the pollutant emission is reduced.

Description

Technical Field

[0001] The utility model relates to a metallurgical sintering technology, in particular to a selective oxygen-rich and steam-rich hot air sintering system, belonging to the technical field of metallurgical sintering. Background Art

[0002] During the sintering process, the temperature of the sintered cake can reach 700-800℃ after being unloaded from the sintering machine. The physical sensible heat resources it carries are the most important part of the sintering waste heat resources. In the process of using air to cool the sintered ore, the temperature of the sintered ore drops below 150℃, and a large amount of hot air is generated. Generally, the temperature of the cooling exhaust gas in different parts of the sintering ring cooler is different. The temperature gradually decreases from the receiving end to the discharging end. It is generally divided into three sections: a high temperature zone with a temperature higher than 250℃, a medium temperature zone with a temperature of 150℃ to 250℃, and a low temperature zone with a temperature lower than 150℃.

[0003] In actual production, many enterprises have built supporting sintering waste heat recovery systems to utilize the high-temperature cooling exhaust gas of the ring cooler in the form of waste heat power generation. However, due to the low temperature of the cooling exhaust gas in the medium and low temperature sections, the boiler heat exchange can only produce low-parameter steam, and the waste heat utilization efficiency is low and the utilization cost is high; some enterprises even directly discharge the medium and low temperature exhaust gas, which wastes resources and pollutes the environment. In addition, some enterprises return part of the flue gas in the ring cooler to the upper sealing cover of the sintering machine in the form of hot air sintering to improve the heat utilization rate of the ring cooling exhaust gas, hoping to reduce the emission of ring cooling flue gas while reducing sintering fuel consumption and improving the quality of sintered ore. For example, patent document CN108731486 A proposes a system and a method for recycling medium and low temperature waste gas in an annular cooler, a smoke hood is set above the sintering machine and connected to the smoke hood above the annular cooler, and the medium and low temperature waste gas of 80℃ to 250℃ of the annular cooler is converted from being directly discharged into the atmosphere to being directly recycled into the bed of the sintering machine, thereby replacing the air originally inhaled from the surrounding atmosphere by the sintering machine for the sintering of raw and auxiliary fuels, so as to make full use of the sensible heat in the medium and low temperature waste gas and eliminate the pollution of the atmospheric environment by direct discharge of dust-containing waste gas. Patent document CN 106931792 B proposes a method and device for comprehensive utilization of waste gas from annular coolers, wherein medium temperature waste gas of 150 to 220℃ is used for ORC low temperature power generation through heat exchange, and the waste gas after utilization is used to return to the sintering process for hot air sintering, or it is mixed with low temperature cooling waste gas of annular cooler of less than 150℃ to become waste gas of about 100℃, and returned to the sintering machine trolley for hot air sintering.

[0004] In the existing technology, directly using the cooling exhaust gas from the medium and low temperature sections for boiler heat exchange can only produce low-parameter steam, and the waste heat preheating efficiency is low and the utilization cost is high. Returning the medium and low temperature exhaust gas to the sintering process instead of air can utilize the waste heat of the exhaust gas to a certain extent from an energy perspective. However, since the temperature of the cooling exhaust gas is much higher than that of air, the gas volume expands, resulting in an oxygen concentration lower than that of normal temperature air (about 310 mg / L), and the higher the temperature, the lower the oxygen concentration, resulting in a reduction in the amount of oxygen drawn into the sintering material layer, which is not conducive to fuel combustion and affects the quality of the sintered minerals. Therefore, the exhaust gas must be cooled to about 100°C before returning to the sintering process and then introduced into the sintering process, resulting in a low efficiency in utilizing the waste heat of the exhaust gas during the sintering process. Utility Model Content

[0005] In view of the problems in the prior art, such as low efficiency and high cost of direct waste heat recovery and utilization of medium and low temperature waste gas in sintering ring cooling waste gas, and low waste heat utilization efficiency caused by lowering the temperature when returning to sintering, the utility model provides a selective oxygen-enriched and steam-enriched hot air sintering system. According to the actual sintering working conditions, the ring cooling waste gas is selectively converted into oxygen-enriched hot air and / or steam-enriched hot air and / or oxygen-enriched steam-enriched hot air that can be directly used in the sintering process through a hot air selective generating device, and high-quality steam and industrial hot water are also obtained during the conversion process. While realizing the waste heat recovery of medium and low temperature waste gas in sintering ring cooling at low cost and high efficiency, the emission of waste gas is significantly reduced, and the quality of sintered ore products is significantly improved.

[0006] In order to achieve the above technical objectives, the technical solutions adopted by the present utility model are as follows:

[0007] A selective oxygen-enriched and steam-enriched hot air sintering system, the system comprising a hot air selective generating device, a sintering device and a cooling device. Two parallel hot air generating chambers are arranged inside the hot air selective generating device. A front material surface hood is arranged above the front material surface of the sintering device, and a rear material surface hood is arranged above the rear material surface of the sintering device. The exhaust gas outlet of the cooling device is connected to the air inlets of the two hot air generating chambers through an exhaust gas conveying pipeline, and the exhaust ports of the two hot air generating chambers are connected to the air inlets of the front material surface hood and the rear material surface hood through a first hot air pipeline and a second hot air pipeline, respectively.

[0008] Preferably, a connecting pipe is provided between the first hot air pipe and the second hot air pipe. A first pipe valve is provided on the first hot air pipe located downstream of the connecting pipe, a second pipe valve is provided on the second hot air pipe located downstream of the connecting pipe, and a third pipe valve is provided on the connecting pipe.

[0009] Preferably, the inner cavity of the hot air selective generating device is divided into two vertically parallel hot air generating chambers by a vertical partition wall. Both hot air generating chambers are divided from bottom to top into an oxygen-supplementing combustion chamber, a high-temperature heat exchange chamber, a low-temperature heat exchange chamber and an atomizing steam adding chamber which are connected in series in sequence. The annular cooling exhaust gas passes through the oxygen-supplementing combustion chamber, the high-temperature heat exchange chamber, the low-temperature heat exchange chamber and the atomizing steam adding chamber in sequence from bottom to top and is selectively converted into oxygen-enriched hot air and / or steam-enriched hot air and / or oxygen-enriched steam-enriched hot air which can be directly used in the sintering process.

[0010] Preferably, burners are independently arranged in the two oxygen-supplemented combustion chambers, and the air inlet ends of the two burners are independently connected to a fuel gas delivery pipeline and an oxygen delivery pipeline.

[0011] Preferably, the interior of the two high-temperature heat exchange chambers are independently provided with a high-parameter steam superheater, a high-parameter steam evaporator, a high-parameter economizer, a deaerator evaporator and a low-parameter economizer from bottom to top, and a steam drum, a deaerator, a desalted water pipe network, a water pipe valve and a steam power generation device are also provided on the outside of the two high-temperature heat exchange chambers. One end of the two high-parameter steam superheaters is connected to the steam power generation device through a pipe valve group, and the other end thereof is connected to the steam drum through a pipeline. Both ends of the two high-parameter steam evaporators are connected to the steam drum through a pipeline. One end of the two high-parameter economizers is connected to the deaerator through a pipeline, and the other end thereof is connected to the steam drum through a pipeline. Both ends of the two deaerator evaporators are connected to the deaerator through a pipeline. One end of the two low-parameter economizers is connected to the desalted water pipe network through a water pipe valve, and the other end thereof is connected to the deaerator through a pipeline.

[0012] Preferably, an industrial water heater is independently arranged in each of the two low-temperature heat exchange chambers, and an industrial water network and a hot water utilization pipeline are arranged outside the two low-temperature heat exchange chambers. The water inlet of the industrial water heater is connected to the industrial water network, and the water outlet is connected to the hot water utilization pipeline.

[0013] Preferably, water mist nozzles are independently provided in the two atomizing steam adding chambers, and the water inlet ends of the two water mist nozzles are respectively connected to one end of the two low-parameter economizers close to the deaerator.

[0014] In the utility model, any one of the high-parameter steam superheater, high-parameter steam evaporator, high-parameter economizer, deoxygenation evaporator, low-parameter economizer, industrial water heater, water mist nozzle, etc. in the two hot air generating chambers can be two independent individuals arranged in the two hot air generating chambers, or it can be a single entity that penetrates the vertical partition wall and is simultaneously arranged in the two hot air generating chambers.

[0015] Preferably, the bottom air inlets of the two hot air generating chambers are both connected to the air inlet hood, and an electric gate valve is also provided between the bottom air inlets of the two hot air generating chambers and the air inlet hood.

[0016] Preferably, a variable frequency baffle valve is hinged at the bottom end of the vertical partition wall, and the variable frequency baffle valve rotates between the two hot air generating chambers with the bottom end of the vertical partition wall as the rotation center. The opening ratio between the bottom air inlets of the two hot air generating chambers is adjusted by adjusting the rotation angle of the variable frequency baffle valve.

[0017] Preferably, on the sintering device: the front material surface hood covers the 1 / 10 to 4 / 10 material surface between the sintering ignition point and the sintering end point, and the rear material surface hood covers the 5 / 10 to 8 / 10 material surface between the sintering ignition point and the sintering end point.

[0018] The low-temperature exhaust gas outlet of the low-temperature section of the cooling device and the medium-temperature exhaust gas outlet of the medium-temperature section of the cooling device are both connected to the air inlets of the two hot air generating chambers through the exhaust gas delivery pipeline. Alternatively, the low-temperature exhaust gas outlet of the low-temperature section of the cooling device is first connected to the cooling air inlet of the medium-temperature section of the cooling device through the circulating air duct, and the medium-temperature exhaust gas outlet of the medium-temperature section of the cooling device is then connected to the air inlets of the two hot air generating chambers through the exhaust gas delivery pipeline.

[0019] In the present invention, the height of the hot air selective generating device is 1-300m, preferably 3-100m, more preferably 5-50m; the thickness of the shell of the hot air selective generating device is 1-100cm, preferably 1.5-60cm, more preferably 3-40cm. The oxygen-supplementing combustion chamber, the high-temperature heat exchange chamber, the low-temperature heat exchange chamber and the atomizing steam chamber have the same or different heights in the vertical direction.

[0020] In the present invention, it should be noted that when the sintering device needs to perform oxygen-enriched sintering or air-enriched sintering, the two hot air generating chambers of the hot air selective generating device are independently controlled, but the operating parameters are consistent, and oxygen-enriched hot air or steam-enriched hot air is obtained. When the sintering device needs to perform air-enriched sintering and steam-enriched sintering at the same time, the two hot air generating chambers of the hot air selective generating device are independently controlled and the operating parameters of the two are different, and oxygen-enriched hot air and steam-enriched hot air are obtained respectively.

[0021] In the utility model, the medium and low temperature waste gas of the ring cooling is successively subjected to heat supplement and quality improvement, step heat exchange and efficient utilization, atomization and steam addition and temperature control, etc., through the hot air selective generating device. At the same time, through the combined control of the frequency conversion damper valve, oxygen supplement combustion parameters, atomization and steam addition parameters and the waste gas outlet pipeline and the connector inside the control device, the hard-to-use medium and low waste gas of the ring cooling with a temperature of less than 250°C can be upgraded to a high temperature waste gas with a temperature higher than 400°C for efficient utilization. At the same time, according to the changes in sintering raw materials, process requirements, pollutant control and other requirements, various types of hot waste gas such as normal oxygen hot air, oxygen-enriched hot air, steam-rich hot air, oxygen-enriched steam-rich hot air, etc. are generated and returned to the sintering front and rear material surface wind hoods, and various advanced technology sintering production such as hot air sintering, oxygen-enriched hot air sintering, steam injection sintering, hot air sintering coupled with steam injection sintering, etc. are carried out, thereby improving the sintering product quality and the level of pollutant process control.

[0022] In the utility model, the low-temperature exhaust gas of the low-temperature section of the ring cooling can be used as the cooling medium of the medium-temperature section of the ring cooling through the circulating air duct, and the material is cooled and heat-exchanged upward to obtain the medium-temperature exhaust gas of the ring cooling, and then the medium-temperature exhaust gas of the ring cooling is sent to the hot air selective generating device for quality improvement and conversion treatment; that is, through the recycling and reuse of the low-temperature exhaust gas, on the one hand, the direct discharge of the low-temperature exhaust gas can be completely avoided, and the temperature of the medium-temperature exhaust gas of the ring cooling originally between 150°C and 250°C can be increased to 200°C to 300°C, so as to realize the enrichment of the sensible heat of the material, which is beneficial to the subsequent efficient recovery of heat; on the other hand, by fully or partially replacing the cold air entering the medium-temperature section of the ring cooling, the total amount of cold air used for cooling by the ring cooler is significantly reduced, and then the output of hot exhaust gas is significantly reduced, and finally the heat discharged with the exhaust gas is also significantly reduced.

[0023] In the present invention, the temperature of the medium-temperature waste gas of the ring cooling is improved compared with the waste gas temperature of the traditional process by circulating the low-temperature waste gas of the ring cooling as the cooling wind of the medium-temperature section of the ring cooling. However, if it is directly used, the wind temperature is relatively low, which makes the waste heat utilization efficiency relatively low (that is, it is difficult to exchange heat with industrial hot water to obtain high-parameter steam). Therefore, the medium-temperature waste gas is transported into the oxygen-supplemented combustion chamber for oxygen-enriched combustion to achieve oxygen and heat supplementation. The oxygen-supplemented combustion chamber generally uses low-value combustible gas (such as blast furnace gas, converter gas, etc.) Low-value gas is easily available in steel plants, which can achieve self-sufficiency. At the same time, this part of low-value fuel gas can also be fully recycled and utilized; if necessary, high-value fuel or fuel gas can also be used, but the relative cost will be higher) and oxygen-enriched gas can be used for combustion. Supplementing oxygen-enriched gas (excess oxygen) is conducive to promoting the full combustion of low-value combustible gas, thereby increasing the flue gas temperature, and on the other hand, it can increase the oxygen concentration in the flue gas, that is, while achieving the supplementary heat for the medium-temperature exhaust gas, the oxygen concentration is simultaneously increased. After oxygen-enriched combustion, the medium-temperature exhaust gas is converted into a high-temperature oxygen-enriched exhaust gas with a temperature of more than 400°C and an oxygen concentration of more than 140 mg / L. In other words, by reheating the medium-temperature exhaust gas with oxygen enrichment, the medium-temperature exhaust gas that is difficult to directly utilize is converted into a high-temperature oxygen-enriched exhaust gas that is easy to directly utilize (that is, the exhaust gas after oxygen-supplemented combustion), and at the same time, the efficient recycling of low-value combustible gas in the plant area is also achieved.

[0024] In the utility model, a step-by-step heat exchange method is used to realize the efficient recovery and utilization of high-temperature oxygen-rich exhaust gas, that is, the high-temperature oxygen-rich exhaust gas passes through the high-temperature heat exchange chamber and the low-temperature heat exchange chamber in turn for two indirect heat exchanges, and then enters the atomizing steam adding chamber to selectively perform or not perform atomizing steam supplementation, thereby respectively producing high-quality steam, industrial hot water, and oxygen-rich hot air and / or steam-rich hot air and / or oxygen-rich steam-rich hot air that can be directly reused for sintering. Specifically: the high-temperature oxygen-rich exhaust gas is first heat-exchanged with industrial hot water in the high-temperature heat exchange chamber to produce high-quality steam with a pressure ≥1.5MPa and a temperature ≥350°C for power generation, and the flue gas temperature at the outlet of the high-temperature heat exchange chamber is reduced to 160°C to 200°C (medium-temperature oxygen-rich exhaust gas); then the medium-temperature oxygen-rich exhaust gas is heat-exchanged with normal temperature water (industrial water) in the low-temperature heat exchange chamber to produce industrial hot water with a temperature ≥90°C, and the industrial hot water can be reused in the high-temperature heat exchange chamber for heat exchange with the high-temperature oxygen-rich exhaust gas to produce high-quality steam. The quality steam is used for the sintering process, and the flue gas temperature at the outlet of the low-temperature heat exchange chamber is reduced to 135-160°C (oxygen-rich hot air); finally, the oxygen-rich hot air is sprayed with atomized water in the atomizing steam chamber for heat exchange cooling to further reduce the flue gas temperature. At the same time, the atomized water absorbs heat and vaporizes into water vapor, and finally produces steam-rich hot air with a temperature of 120°C to 135°C, an oxygen concentration of 310mg / L to 400mg / L, and a water vapor concentration of about 2.5% to 5%, which can be directly reused for sintering. In other words, the utility model realizes the efficient step-by-step utilization of high-temperature oxygen-rich exhaust gas by step-by-step heat exchange, and obtains a multi-stage product that can be directly recycled internally, realizing the complete consumption and utilization of high-temperature oxygen-rich exhaust gas without exhaust gas emissions.

[0025] In the utility model, oxygen-enriched hot air and steam-enriched hot air are respectively sent to the sintering front section and sintering back section of the sintering machine through a circulating gas pipe to replace the normal temperature air and enter the sintering material layer to promote the sintering reaction. Among them, the sintering front section refers to the section where the 1 / 10 to 4 / 10 section of the material surface is located between the sintering ignition point and the sintering end point; the sintering back section refers to the section where the 5 / 10 to 8 / 10 section of the material surface is located between the sintering ignition point and the sintering end point. The oxygen-enriched hot air is directly returned to the sintering front section material surface for hot air sintering, which increases the upper limit of the hot air allowable temperature and realizes oxygen-enriched sintering, optimizes the sintering reaction process in the front and middle ends of sintering, and improves the quality indicators of sintered minerals; and the steam-enriched hot air is directly returned to the sintering back section material surface for oxygen-enriched steam injection sintering, which optimizes the sintering reaction process in the middle and rear ends of sintering and improves the quality of sintered minerals.

[0026] In the utility model, an oxygen-enriched burner is arranged in the oxygen-supplemented combustion chamber, which is used to increase the temperature and oxygen concentration of the low-temperature exhaust gas in the annular cooling. It can be an independent heat-supplementing burner and oxygen-supplementing nozzle, or it can be an oxygen-enriched combustion burner; the upper end of the oxygen-supplemented combustion chamber is connected to the lower end of the high-temperature heat exchange chamber.

[0027] In the utility model, a high-parameter steam superheater, a high-parameter steam evaporator, a high-parameter economizer, a deoxygenation evaporator and a low-parameter economizer are arranged in sequence from bottom to top in the high-temperature heat exchange chamber, and a steam drum, a deaerator, a desalted water pipeline network and a steam power generation device are arranged on the outside thereof. The oxygen-rich high-temperature hot flue gas from the oxygen-supplemented combustion chamber is indirectly heat exchanged with the industrial hot water sent into the high-temperature heat exchange chamber. The industrial hot water absorbs the heat carried by the oxygen-rich high-temperature hot flue gas and is converted into high-parameter steam for power generation; the oxygen-rich high-temperature hot flue gas is converted into oxygen-rich medium-temperature hot flue gas and enters the low-temperature heat exchange chamber upward.

[0028] In the utility model, an industrial water heater is arranged in the low-temperature heat exchange chamber, and the industrial water heater is connected to the industrial water pipe network arranged outside. The industrial water pipe network sends industrial cold water (ambient temperature) into the industrial water heater for indirect heat exchange with the oxygen-rich medium-temperature hot flue gas from the high-temperature heat exchange chamber. After the industrial cold water absorbs heat, it produces industrial hot water and supplies it to the high-temperature heat exchange area and the sintering production process; after the oxygen-rich medium-temperature hot flue gas is heat exchanged and cooled, it is transformed into oxygen-rich hot waste gas and enters the atomizing steam chamber upward.

[0029] In the utility model, a water mist nozzle is provided in the atomizing steam adding chamber. The oxygen-rich hot exhaust gas from the low-temperature heat exchange chamber is sprayed with water mist through the water mist nozzle, which reduces the exhaust gas temperature and increases the concentration of water vapor in the exhaust gas, thereby obtaining steam-rich hot air that can be directly reused for sintering. Alternatively, the oxygen-rich hot exhaust gas from the low-temperature heat exchange chamber is directly discharged without being sprayed with water mist through the water mist nozzle, thereby obtaining oxygen-rich hot air that can be directly reused for sintering. It should be noted that in the two atomizing steam adding chambers, if one starts the water mist nozzle and the other does not start the water mist nozzle, oxygen-rich hot air and steam-rich hot air that can be directly reused for sintering can be obtained at the same time.

[0030] In the utility model, the system and process of the utility model adopt technical means such as cascade utilization of low-temperature exhaust gas from comprehensive sintering ring cooling, simultaneous heat and oxygen supplementation for medium-temperature exhaust gas to improve quality, and cascade heat exchange and steam enrichment to eliminate direct emission of low-temperature exhaust gas, and then use low-value coal gas combustion in the steel plant to supplement heat and coordinate oxygen supplementation or oxygen-enriched combustion to increase the temperature of medium and low-temperature exhaust gases to meet the requirements of producing high-parameter steam while significantly increasing the oxygen content in the exhaust gas. After heat exchange to produce high-quality steam and industrial hot water, selective diversion water mist spraying is used to further control the flue gas temperature, thereby achieving the purpose of containing a certain amount of water vapor in the exhaust gas. By taking the above technical measures, firstly, the recovery of waste heat from medium and low temperature exhaust gas in sintering ring cooling is transformed from direct discharge or recovery of low parameter steam to recovery of high parameter steam, and the quality and efficiency of waste heat recovery are improved; secondly, oxygen and steam are added to the medium and low temperature exhaust gas while replenishing heat, so as to increase the oxygen concentration in the exhaust gas finally returned to sintering (≥310mg / L of oxygen concentration in air at normal temperature), so that when the exhaust gas temperature entering sintering is greater than 120℃, its oxygen content can still meet the needs of sintering reaction, eliminating the effect of thin oxygen at high temperature on sintering. The negative impact of the process is reduced, and the utilization rate of waste heat from exhaust gas in the sintering process is improved; thirdly, the oxygen-rich hot exhaust gas and the oxygen-rich steam-rich hot exhaust gas are selectively returned to the exhaust gas at the front and rear stages of sintering to carry out oxygen-rich hot air sintering and oxygen-rich steam blowing sintering. Compared with ordinary air, it contains both excess oxygen and part of steam. The improvement effects of the existing "oxygen-enriched sintering technology" and "surface steam injection technology" on sintering are superimposed. When this exhaust gas is used to replace air for sintering, the quality indicators of sintered minerals can be significantly improved and pollutant emissions can be reduced.

[0031] In the utility model, the system and process of the utility model are equipped with an internal frequency conversion damper valve, an oxygen-supplementing combustion mechanism, a high / low temperature heat exchange mechanism, an atomizing steam adding mechanism, and a waste gas outlet pipe and a joint control mechanism of a connector. While improving the quality of the medium and low temperature waste gas from the sintering ring cooling for efficient utilization, it can also couple the needs of advanced sintering technology to generate hot waste gas with different characteristics to return to the sintering material surface for utilization, thereby efficiently utilizing the waste heat of the waste gas.

[0032] In the present invention, when the sintering production process requires oxygen-enriched hot air sintering, the specific process of selective oxygen-enriched and steam-enriched hot air sintering is as follows:

[0033] The medium and low temperature cooling waste gas of the sintering ring cooling with a temperature of ≤250℃ enters the hot air selective generating device from the air inlet hood, and the variable frequency damper valve is controlled to be closed (i.e., in the initial vertical state), so that the waste gas flow rate on both sides of the vertical partition wall of the device is 1:1; the combustion system in the heat and oxygen supply chamber is turned on, and the heat supply intensity is controlled by adjusting the gas combustion amount. At the same time, the combustion oxygen flow rate is controlled to be higher than the amount required for gas combustion for oxygen-enriched combustion, so that the cooling waste gas temperature is increased to T1 (400℃≤T1≤550℃), and the oxygen concentration is supplemented to ρ, where the value of ρ is calculated as follows:

[0034] ρ=310×(1+γ)×(273.15+T2) / (273.15+T1) (1)

[0035] In formula (1), 310 is the oxygen concentration in air at room temperature, mg / L. γ is the oxygen enrichment coefficient of oxygen-enriched sintering, which takes a value of 0-30% (when γ takes a value of 0, it is hot air sintering with normal oxygen (oxygen concentration is 310 mg / L)). T2 is the temperature of oxygen-enriched hot air, which takes a value of 135-160°C. After the cooling exhaust gas is heated, the reheated oxygen-supplemented hot exhaust gas passes through the high-temperature heat exchange chamber and the low-temperature heat exchange chamber in turn. The high-temperature heat exchange chamber produces high-parameter steam with a temperature of ≥350°C and a pressure of ≥1.5MPa for power generation, and the low-temperature heat exchange chamber produces industrial hot water with a temperature of ≥90°C and returns to various processes in the factory area for use. In this process, the water mist nozzles in the two atomizing and steaming chambers are both closed, and the oxygen concentration of the oxygen-enriched hot air is not less than 310 mg / L (approximately 310(1+γ)mg / L). The oxygen-enriched hot air is transported to the sintering front-stage material surface wind hood through the first hot air duct, the second hot air duct, the connecting pipe and the corresponding pipeline valves for oxygen-enriched hot air sintering.

[0036] In the present invention, when the sintering production process requires steam injection sintering (i.e. steam-rich sintering), the specific process of selective oxygen-rich and steam-rich hot air sintering is as follows:

[0037] The medium and low temperature cooling waste gas of the sintering ring cooling with a temperature of ≤250℃ enters the hot air selective generating device from the air inlet hood, and the variable frequency damper valve is controlled to be closed (i.e., in the initial vertical state), so that the waste gas flow rate on both sides of the vertical partition wall of the device is 1:1; the combustion system in the heat and oxygen supplement chamber is turned on, and the heat supplement intensity is controlled by adjusting the gas combustion amount. At the same time, the combustion oxygen flow rate is controlled to be higher than the amount required for gas combustion for oxygen-enriched combustion, so that the cooling waste gas temperature is increased to T1 (400℃≤T1≤550℃), and the oxygen concentration is supplemented to ρ, where the value of ρ is calculated as follows:

[0038] ρ=310×(1+γ)×(273.15+T3) / (273.15+T1) (2)

[0039] In formula (2), 310 is the oxygen concentration value in normal temperature air, mg / L. γ is the oxygen enrichment coefficient of oxygen-enriched sintering, which takes a value of 0-30% (when γ takes a value of 0, it is steam-rich hot air sintering with normal oxygen (oxygen concentration is 310 mg / L)). T3 is the temperature of steam-rich hot air, which takes a value of 120-135°C. After the cooling exhaust gas is heated, the reheated oxygen-supplemented hot exhaust gas passes through the high-temperature heat exchange chamber and the low-temperature heat exchange chamber in turn, where the high-temperature heat exchange chamber produces high-parameter steam with a temperature of ≥350°C and a pressure of ≥1.5MPa for power generation, and the low-temperature heat exchange chamber produces industrial hot water with a temperature of ≥90°C and returns to various processes in the factory area for use. In this process, the water mist nozzles in the two atomizing and steaming chambers are both in the open state, and the oxygen concentration of the steam-rich hot air is not less than 310 mg / L (approximately 310(1+γ)mg / L), and its water vapor concentration is 2.5-5wt%. The steam-rich hot air is transported to the sintering rear stage material surface wind hood through the first hot air pipeline, the second hot air pipeline, the connecting pipe and the corresponding pipeline valves for steam-rich hot air sintering.

[0040] In the present invention, when the sintering production process requires (oxygen-enriched) hot air sintering coupled with steam injection sintering (i.e., oxygen-enriched and steam-enriched sintering is performed simultaneously), the specific process of selective oxygen-enriched and steam-enriched hot air sintering is as follows:

[0041] The sintering ring cooling medium and low temperature cooling waste gas with a temperature of ≤250℃ enters the hot air selective generating device from the air inlet hood, and the variable frequency damper valve is controlled to make the waste gas flow ratio on both sides of the vertical partition wall of the device 40-80%:20-60%; in one of the hot air generating chambers (such as Figure 1 The combustion system in the heat and oxygen supplement chamber (the right side hot air generating chamber) is turned on, and the heat supplement intensity is controlled by adjusting the gas combustion amount. At the same time, the combustion oxygen flow rate is controlled to be higher than the amount required for gas combustion to perform oxygen-enriched combustion, so that the temperature of the cooling exhaust gas accounting for 40-80% is increased to T1 (400℃≤T1≤550℃), and the oxygen concentration is supplemented to ρ, where the value of ρ is calculated as follows:

[0042] ρ=310×(1+γ)×(273.15+T2) / (273.15+T1) (1)

[0043] In formula (1), 310 is the oxygen concentration in air at room temperature, mg / L. γ is the oxygen enrichment coefficient of oxygen-enriched sintering, which takes a value of 0-30% (when γ takes a value of 0, it is hot air sintering with normal oxygen (oxygen concentration is 310 mg / L)). T2 is the temperature of oxygen-enriched hot air, which takes a value of 135-160°C. After the cooling exhaust gas is heated, the reheated oxygen-supplemented hot exhaust gas passes through the high-temperature heat exchange chamber and the low-temperature heat exchange chamber in turn. The high-temperature heat exchange chamber produces high-parameter steam with a temperature of ≥350°C and a pressure of ≥1.5MPa for power generation, and the low-temperature heat exchange chamber produces industrial hot water with a temperature of ≥90°C and returns to various processes in the factory area for use. In this process, the water mist nozzles in the two atomizing and steaming chambers are both closed, and the oxygen concentration of the oxygen-enriched hot air is not less than 310 mg / L (approximately 310(1+γ)mg / L). This part of oxygen-enriched hot air is transported to the sintering front-stage material surface wind hood through the first hot air pipeline, the second hot air pipeline, the connecting pipe and the corresponding pipeline valves for oxygen-enriched hot air sintering.

[0044] In one of the hot air generating chambers (such as Figure 1 The combustion system in the heat and oxygen supplement chamber (the left hot air generating chamber) is turned on, and the heat supplement intensity is controlled by adjusting the gas combustion amount. At the same time, the combustion oxygen flow rate is controlled to be higher than the amount required for gas combustion to perform oxygen-enriched combustion, so that the temperature of the cooling exhaust gas accounting for 20-60% is increased to T1 (400℃≤T1≤550℃), and the oxygen concentration is supplemented to ρ, where the value of ρ is calculated as shown in formula (2):

[0045] ρ=310×(1+γ)×(273.15+T3) / (273.15+T1) (2)

[0046] In formula (2), 310 is the oxygen concentration value in normal temperature air, mg / L. γ is the oxygen enrichment coefficient of oxygen-enriched sintering, which takes a value of 0-30% (when γ takes a value of 0, it is steam-rich hot air sintering with normal oxygen (oxygen concentration is 310 mg / L)). T3 is the temperature of steam-rich hot air, which takes a value of 120-135°C. After the cooling exhaust gas is heated, the reheated oxygen-supplemented hot exhaust gas passes through the high-temperature heat exchange chamber and the low-temperature heat exchange chamber in turn, where the high-temperature heat exchange chamber produces high-parameter steam with a temperature of ≥350°C and a pressure of ≥1.5MPa for power generation, and the low-temperature heat exchange chamber produces industrial hot water with a temperature of ≥90°C and returns to various processes in the factory area for use. In this process, the water mist nozzles in the two atomizing and steaming chambers are both in the open state, and the oxygen concentration of the steam-rich hot air is not less than 310 mg / L (approximately 310(1+γ)mg / L), and its water vapor concentration is 2.5-5wt%. This part of the steam-rich hot air is transported to the sintering rear stage material surface wind hood through the first hot air pipeline, the second hot air pipeline, the connecting pipe and the corresponding pipeline valves for steam-rich hot air sintering.

[0047] Compared with the prior art, the beneficial technical effects of the utility model are as follows:

[0048] 1: The system provided by the utility model realizes the recovery of waste heat of medium and low temperature exhaust gas in sintering ring cooling, which is transformed from direct emission or recovery of low-parameter steam to recovery of high-parameter steam, with zero exhaust gas emission, and significantly improves the quality and efficiency of waste heat recovery; at the same time, oxygen is added to the medium and low temperature exhaust gas while replenishing heat, so as to increase the oxygen concentration in the exhaust gas finally returned to sintering, and when the exhaust gas temperature is greater than 120°C, the oxygen content of the exhaust gas entering the sintering material layer can still meet the reaction needs, eliminating the negative impact of thin oxygen at high temperature on the sintering process, and improving the utilization rate of waste heat of the exhaust gas in the sintering process.

[0049] 2: The system provided by the utility model integrates the units of heat supplement, oxygen enrichment, temperature control, steam injection, etc. into one, with strong adjustability. It takes advantage of the positive effects of technical means such as cascade utilization of low-temperature exhaust gas from comprehensive sintering ring cooling, simultaneous heat supplement and oxygen supplement for quality improvement of medium-temperature exhaust gas, and cascade heat exchange and steam enrichment, which greatly improves the waste heat utilization efficiency of low-temperature exhaust gas from the ring cooler and reduces exhaust gas emissions.

[0050] 3: The system of the utility model can selectively obtain oxygen-rich hot air and / or steam-rich hot air and / or oxygen-rich steam-rich hot air, and other types of hot waste gas at the same time or in different areas and in a quantitative manner according to the changes in sintering raw materials, process requirements, pollutant control and other needs, and return them to different sintering material surfaces for oxygen-rich hot air sintering and oxygen-rich steam injection sintering, so as to improve the quality of sintered minerals and reduce pollutant emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a structural schematic diagram of the system of the utility model.

[0052] Figure numerals: A: hot air selective generating device; B: sintering device; C: cooling device; 1: air intake hood; 101: electric gate valve; 2: vertical partition wall; 3: variable frequency damper valve; 4: oxygen supplement combustion chamber; 401: burner; 402: gas transmission pipeline; 403: oxygen transmission pipeline; 5: high temperature heat exchange chamber; 501: high parameter steam superheater; 502: high parameter steam evaporator; 503: high parameter economizer; 504: steam drum; 505: deoxygenation evaporator; 506: low parameter economizer 507: deaerator; 508: desalted water pipe network; 509: water pipe valve; 510: steam power generation device; 6: low temperature heat exchange chamber; 601: industrial water heater; 602: industrial water pipe network; 603: hot water utilization pipeline; 7: atomizing steam chamber; 701: water mist nozzle; 8: first hot air pipeline; 801: first pipeline valve; 9: second hot air pipeline; 901: second pipeline valve; 10: connecting pipe; 1001: third pipeline valve; 11: front material surface wind hood; 12: rear material surface wind hood. DETAILED DESCRIPTION

[0053] The technical solution of the utility model is illustrated below, and the scope of protection requested for the utility model includes but is not limited to the following embodiments.

[0054] A selective oxygen-enriched and steam-enriched hot air sintering system, the system comprises a hot air selective generating device A, a sintering device B and a cooling device C. Two parallel hot air generating chambers are arranged inside the hot air selective generating device A. A front material surface hood 11 is arranged above the front material surface of the sintering device B, and a rear material surface hood 12 is arranged above the rear material surface of the sintering device B. The exhaust gas outlet of the cooling device C is connected to the air inlets of the two hot air generating chambers through an exhaust gas conveying pipeline, and the exhaust ports of the two hot air generating chambers are connected to the air inlets of the front material surface hood 11 and the rear material surface hood 12 through a first hot air duct 8 and a second hot air duct 9, respectively.

[0055] Preferably, a connecting pipe 10 is provided between the first hot air duct 8 and the second hot air duct 9. A first pipe valve 801 is provided on the first hot air duct 8 located downstream of the connecting pipe 10, a second pipe valve 901 is provided on the second hot air duct 9 located downstream of the connecting pipe 10, and a third pipe valve 1001 is provided on the connecting pipe 10.

[0056] Preferably, the inner cavity of the hot air selective generating device A is divided into two vertically parallel hot air generating chambers by a vertical partition wall 2. Both hot air generating chambers are divided from bottom to top into an oxygen-supplementing combustion chamber 4, a high-temperature heat exchange chamber 5, a low-temperature heat exchange chamber 6 and an atomizing steam adding chamber 7 which are connected in series in sequence. The annular cooling exhaust gas passes through the oxygen-supplementing combustion chamber 4, the high-temperature heat exchange chamber 5, the low-temperature heat exchange chamber 6 and the atomizing steam adding chamber 7 in sequence from bottom to top and is selectively converted into oxygen-enriched hot air and / or steam-enriched hot air and / or oxygen-enriched steam-enriched hot air which can be directly used in the sintering process.

[0057] Preferably, burners 401 are independently provided in the two oxygen-supplemented combustion chambers 4, and the air inlet ends of the two burners 401 are independently connected to a fuel gas delivery pipeline 402 and an oxygen delivery pipeline 403.

[0058] As a preferred embodiment, the interior of the two high-temperature heat exchange chambers 5 are independently provided with a high-parameter steam superheater 501, a high-parameter steam evaporator 502, a high-parameter economizer 503, a deaerator evaporator 505 and a low-parameter economizer 506 from bottom to top, and a steam drum 504, a deaerator 507, a desalted water pipe network 508, a water pipe valve 509 and a steam power generation device 510 are also provided on the outside of the two high-temperature heat exchange chambers 5. One end of the two high-parameter steam superheaters 501 is connected to the steam power generation device 510 through a pipe valve group, and the other end thereof is connected to the steam drum 504 through a pipeline. Both ends of the two high-parameter steam evaporators 502 are connected to the steam drum 504 through a pipeline. One end of the two high-parameter economizers 503 is connected to the deaerator 507 through a pipeline, and the other end thereof is connected to the steam drum 504 through a pipeline. Both ends of the two deaerator evaporators 505 are connected to the deaerator 507 through a pipeline. One ends of the two low-parameter economizers 506 are connected to the desalted water network 508 through a water pipe valve 509 , and the other ends thereof are connected to the deaerator 507 through a pipeline.

[0059] Preferably, an industrial water heater 601 is independently provided in each of the two low-temperature heat exchange chambers 6, and an industrial water network 602 and a hot water utilization pipeline 603 are provided outside the two low-temperature heat exchange chambers 6. The water inlet end of the industrial water heater 601 is connected to the industrial water network 602, and the water outlet end thereof is connected to the hot water utilization pipeline 603.

[0060] Preferably, water mist nozzles 701 are independently provided in the two atomizing and steaming chambers 7 , and the water inlet ends of the two water mist nozzles 701 are respectively connected to one end of the two low-parameter economizers 506 close to the deaerator 507 .

[0061] Preferably, the bottom air inlets of the two hot air generating chambers are both connected to the air inlet hood 1 , and an electric gate valve 101 is also provided between the bottom air inlets of the two hot air generating chambers and the air inlet hood 1 .

[0062] Preferably, a variable frequency baffle valve 3 is hinged at the bottom end of the vertical partition wall 2. The variable frequency baffle valve 3 rotates between the two hot air generating chambers with the bottom end of the vertical partition wall 2 as the rotation center. The opening ratio between the bottom air inlets of the two hot air generating chambers is adjusted by adjusting the rotation angle of the variable frequency baffle valve 3.

[0063] Preferably, in the sintering device B, the front material surface hood 11 covers the 1 / 10 to 4 / 10 material surface between the sintering ignition point and the sintering end point, and the rear material surface hood 12 covers the 5 / 10 to 8 / 10 material surface between the sintering ignition point and the sintering end point.

[0064] The low-temperature exhaust gas outlet of the low-temperature section of cooling device C and the medium-temperature exhaust gas outlet of the medium-temperature section of cooling device C are both connected to the air inlets of the two hot air generating chambers through the exhaust gas delivery pipeline. Alternatively, the low-temperature exhaust gas outlet of the low-temperature section of cooling device C is first connected to the cooling air inlet of the medium-temperature section of cooling device C through the circulating air duct, and the medium-temperature exhaust gas outlet of the medium-temperature section of cooling device C is then connected to the air inlets of the two hot air generating chambers through the exhaust gas delivery pipeline.

[0065] Example 1

[0066] like Figure 1 As shown, a selective oxygen-enriched and steam-enriched hot air sintering system comprises a hot air selective generating device A, a sintering device B and a cooling device C. Two parallel hot air generating chambers are arranged inside the hot air selective generating device A. A front material surface hood 11 is arranged above the front material surface of the sintering device B, and a rear material surface hood 12 is arranged above the rear material surface of the sintering device B. The exhaust gas outlet of the cooling device C is connected to the air inlets of the two hot air generating chambers through the exhaust gas conveying pipeline, and the exhaust ports of the two hot air generating chambers are connected to the air inlets of the front material surface hood 11 and the rear material surface hood 12 through the first hot air duct 8 and the second hot air duct 9 respectively.

[0067] Example 2

[0068] Example 1 is repeated, except that a connecting pipe 10 is provided between the first hot air duct 8 and the second hot air duct 9. A first pipe valve 801 is provided on the first hot air duct 8 located downstream of the connecting pipe 10, a second pipe valve 901 is provided on the second hot air duct 9 located downstream of the connecting pipe 10, and a third pipe valve 1001 is provided on the connecting pipe 10.

[0069] Example 3

[0070] Example 2 is repeated, except that the inner cavity of the hot air selective generating device A is divided into two vertically parallel hot air generating chambers by a vertical partition wall 2. The two hot air generating chambers are divided from bottom to top into an oxygen-supplementing combustion chamber 4, a high-temperature heat exchange chamber 5, a low-temperature heat exchange chamber 6 and an atomizing steam adding chamber 7 which are connected in series in sequence. The annular cooling exhaust gas passes through the oxygen-supplementing combustion chamber 4, the high-temperature heat exchange chamber 5, the low-temperature heat exchange chamber 6 and the atomizing steam adding chamber 7 from bottom to top in sequence and is selectively converted into oxygen-rich hot air, steam-rich hot air, and oxygen-rich steam-rich hot air which can be directly used in the sintering process.

[0071] Example 4

[0072] Example 3 is repeated, except that burners 401 are independently provided in two oxygen-supplemented combustion chambers 4, and the air inlet ends of the two burners 401 are independently connected to a fuel gas delivery pipeline 402 and an oxygen delivery pipeline 403.

[0073] Example 5

[0074] Example 4 is repeated, except that the interiors of the two high-temperature heat exchange chambers 5 are independently provided with a high-parameter steam superheater 501, a high-parameter steam evaporator 502, a high-parameter economizer 503, a deaerator evaporator 505 and a low-parameter economizer 506 from bottom to top, and a steam drum 504, a deaerator 507, a desalted water pipe network 508, a water pipe valve 509 and a steam power generation device 510 are also provided on the outside of the two high-temperature heat exchange chambers 5. One end of the two high-parameter steam superheaters 501 is connected to the steam power generation device 510 through a pipe valve group, and the other end thereof is connected to the steam drum 504 through a pipeline. Both ends of the two high-parameter steam evaporators 502 are connected to the steam drum 504 through a pipeline. One end of the two high-parameter economizers 503 is connected to the deaerator 507 through a pipeline, and the other end thereof is connected to the steam drum 504 through a pipeline. Both ends of the two deaerator evaporators 505 are connected to the deaerator 507 through a pipeline. One ends of the two low-parameter economizers 506 are connected to the desalted water network 508 through a water pipe valve 509 , and the other ends thereof are connected to the deaerator 507 through a pipeline.

[0075] Example 6

[0076] Example 5 is repeated, except that an industrial water heater 601 is independently provided in each of the two low-temperature heat exchange chambers 6, and an industrial water network 602 and a hot water utilization pipeline 603 are provided outside the two low-temperature heat exchange chambers 6. The water inlet end of the industrial water heater 601 is connected to the industrial water network 602, and the water outlet end thereof is connected to the hot water utilization pipeline 603.

[0077] Example 7

[0078] Example 6 is repeated, except that water mist nozzles 701 are independently provided in the two atomizing and steaming chambers 7, and the water inlet ends of the two water mist nozzles 701 are respectively connected to one end of the two low-parameter economizers 506 close to the deaerator 507.

[0079] Example 8

[0080] Example 7 is repeated, except that the bottom air inlets of the two hot air generating chambers are both connected to the air inlet hood 1, and an electric gate valve 101 is further provided between the bottom air inlets of the two hot air generating chambers and the air inlet hood 1.

[0081] Example 9

[0082] Example 8 is repeated, except that a variable frequency baffle valve 3 is further hinged at the bottom end of the vertical partition wall 2. The variable frequency baffle valve 3 rotates between the two hot air generating chambers with the bottom end of the vertical partition wall 2 as the rotation center. The opening ratio between the bottom air inlets of the two hot air generating chambers is adjusted by adjusting the rotation angle of the variable frequency baffle valve 3.

[0083] Example 10

[0084] Example 9 was repeated, except that in sintering device B: the front material surface hood 11 covers the area from 1 / 10 to 4 / 10 of the material surface between the sintering ignition point and the sintering end point, and the rear material surface hood 12 covers the area from 5 / 10 to 8 / 10 of the material surface between the sintering ignition point and the sintering end point.

[0085] Embodiment 11

[0086] Example 10 is repeated, except that the low-temperature exhaust gas outlet of the low-temperature section of cooling device C and the medium-temperature exhaust gas outlet of the medium-temperature section of cooling device C are both connected to the air inlets of the two hot air generating chambers through the exhaust gas conveying pipeline.

[0087] Example 12

[0088] Example 10 is repeated, except that the low-temperature exhaust gas outlet of the low-temperature section of cooling device C is first connected to the cooling air inlet of the medium-temperature section of cooling device C through a circulating air duct, and the medium-temperature exhaust gas outlet of the medium-temperature section of cooling device C is then connected to the air inlets of the two hot air generating chambers through an exhaust gas conveying duct.

Claims

1. A selective oxygen-enriched and steam-enriched hot air sintering system, characterized in that: The system comprises a hot air selective generating device (A), a sintering device (B) and a cooling device (C); the hot air selective generating device (A) is provided with two parallel hot air generating chambers; a front material surface hood (11) is provided above the front material surface of the sintering device (B), and a rear material surface hood (12) is provided above the rear material surface of the sintering device (B); the waste gas outlet of the cooling device (C) is connected to the air inlets of the two hot air generating chambers through a waste gas conveying pipeline, and the air outlets of the two hot air generating chambers are respectively connected to the air inlets of the front material surface hood (11) and the air inlets of the rear material surface hood (12) through a first hot air pipeline (8) and a second hot air pipeline (9).

2. The system according to claim 1, characterized in that: A connecting pipe (10) is provided between the first hot air pipe (8) and the second hot air pipe (9); a first pipe valve (801) is provided on the first hot air pipe (8) located downstream of the connecting pipe (10); a second pipe valve (901) is provided on the second hot air pipe (9) located downstream of the connecting pipe (10); and a third pipe valve (1001) is provided on the connecting pipe (10).

3. The system according to claim 1 or 2, characterized in that: The inner cavity of the hot air selective generating device (A) is divided into two hot air generating chambers which are vertically arranged in parallel by a vertical partition wall (2); the two hot air generating chambers are divided from bottom to top into an oxygen-supplementing combustion chamber (4), a high-temperature heat exchange chamber (5), a low-temperature heat exchange chamber (6) and an atomizing steam adding chamber (7) which are connected in series in sequence; the annular cooling exhaust gas passes through the oxygen-supplementing combustion chamber (4), the high-temperature heat exchange chamber (5), the low-temperature heat exchange chamber (6) and the atomizing steam adding chamber (7) in sequence from bottom to top, and is selectively converted into oxygen-enriched hot air and / or steam-enriched hot air and / or oxygen-enriched steam-enriched hot air which can be directly used in the sintering process.

4. The system according to claim 3, characterized in that: Burners (401) are independently arranged in the two oxygen-supplementing combustion chambers (4), and the air inlet ends of the two burners (401) are independently connected to a fuel gas delivery pipeline (402) and an oxygen delivery pipeline (403).

5. The system according to claim 3 or 4, characterized in that: The interior of the two high-temperature heat exchange chambers (5) are independently provided with a high-parameter steam superheater (501), a high-parameter steam evaporator (502), a high-parameter economizer (503), a deaerator evaporator (505) and a low-parameter economizer (506) in order from bottom to top, and a steam drum (504), a deaerator (507), a desalted water pipe network (508), a water pipe valve (509) and a steam power generation device (510) are also provided on the outside of the two high-temperature heat exchange chambers (5); one end of the two high-parameter steam superheaters (501) are connected to the steam power generation device (510) through a pipe valve group, and the other end of each of them is connected to the steam power generation device (510) through a pipe valve group. The two high-parameter steam evaporators (502) are connected to the steam drum (504) through a pipeline at both ends; the two high-parameter economizers (503) are connected to the deaerator (507) at one end through a pipeline, and their other ends are connected to the steam drum (504) through a pipeline; the two deaerator evaporators (505) are connected to the deaerator (507) at both ends through a pipeline; the two low-parameter economizers (506) are connected to the desalted water network (508) at one end through a water pipe valve (509), and their other ends are connected to the deaerator (507) through a pipeline.

6. The system according to any one of claims 3 to 5, characterized in that: An industrial water heater (601) is independently arranged in each of the two low-temperature heat exchange chambers (6), and an industrial water pipe network (602) and a hot water utilization pipe (603) are arranged outside the two low-temperature heat exchange chambers (6); the water inlet end of the industrial water heater (601) is connected to the industrial water pipe network (602), and the water outlet end thereof is connected to the hot water utilization pipe (603).

7. The system according to any one of claims 3 to 6, characterized in that: Water mist nozzles (701) are independently arranged in the two atomizing steam adding chambers (7), and the water inlet ends of the two water mist nozzles (701) are respectively connected to one end of the two low-parameter economizers (506) close to the deaerator (507).

8. The system according to any one of claims 3 to 7, characterized in that: The bottom air inlets of the two hot air generating chambers are both connected to the air inlet hood (1), and an electric gate valve (101) is also provided between the bottom air inlets of the two hot air generating chambers and the air inlet hood (1).

9. The system according to any one of claims 3 to 8, characterized in that: A variable frequency damper valve (3) is also hinged at the bottom end of the vertical partition wall (2). The variable frequency damper valve (3) rotates between the two hot air generating chambers with the bottom end of the vertical partition wall (2) as the rotation center. The opening ratio between the bottom air inlets of the two hot air generating chambers is adjusted by adjusting the rotation angle of the variable frequency damper valve (3).

10. The system according to any one of claims 1 to 9, characterized in that: On the sintering device (B), the front material surface wind hood (11) covers the area of ​​the material surface from the 1 / 10 to the 4 / 10 section between the sintering ignition point and the sintering end point; the rear material surface wind hood (12) covers the area of ​​the material surface from the 5 / 10 to the 8 / 10 section between the sintering ignition point and the sintering end point; The low-temperature exhaust gas outlet of the low-temperature section of the cooling device (C) and the medium-temperature exhaust gas outlet of the medium-temperature section of the cooling device (C) are both connected to the air inlets of the two hot air generating chambers through the exhaust gas conveying pipeline; or, the low-temperature exhaust gas outlet of the low-temperature section of the cooling device (C) is first connected to the cooling air inlet of the medium-temperature section of the cooling device (C) through the circulating air duct, and the medium-temperature exhaust gas outlet of the medium-temperature section of the cooling device (C) is then connected to the air inlets of the two hot air generating chambers through the exhaust gas conveying pipeline.

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