Hot waste gas comprehensive utilization system and method based on sintering machine

Abstract

The invention discloses a hot waste gas comprehensive utilization system and method based on a sintering machine, the hot waste gas comprehensive utilization system based on the sintering machine comprises the sintering machine, the sintering machine comprises a sintering trolley, a flue and a purification device, the gas inlet end of the flue is connected with the sintering trolley, and the gas outlet end of the flue is connected with the purification device; the feeding end of the circular cooler is connected with the discharging end of the sintering trolley, the discharging end of the sintering trolley is provided with an air jet opening facing the material face, and the air outlet end of the circular cooler is connected with the air jet opening; the air outlet end of the circular cooler is further connected with the air inlet end of the heat energy recovery device; and a waste gas outlet of the industrial kiln is connected with the gas inlet end of the circular cooler. The hot waste gas generated by the industrial kiln directly enters the circular cooler to assist in cooling the sintered ore, so that the quality of the sintered ore can be improved, the utilization rate of the hot waste gas can be increased, a waste gas treatment device of the industrial kiln is omitted, and the cost is greatly saved.

Description

Technical Field

[0001] This application belongs to the technical field of thermal waste gas utilization, and particularly relates to a comprehensive thermal waste gas utilization system and method based on a sintering machine. Background Art

[0002] In the iron and steel industry, many iron and steel enterprises have built sleeve kilns or gas-fired kilns according to the balance of blast furnace gas, coke oven gas, converter gas, etc. Since the waste gas generated after combustion in the sleeve kiln and the gas-fired kiln is about 200°C, some of which do not meet the standards and need to be disposed of for denitrification, which not only causes heat waste but also requires increased investment in building corresponding environmental protection facilities.

[0003] On the other hand, the cooling in the sintering process of iron and steel enterprises mainly improves the cooling effect by adjusting the wind speed and improving the cloth, and less research is done on improving the cooling medium. Currently, the sintering cooling process mainly uses ordinary air as the cooling medium, and the air contains 21% of O2 with a relatively high content. There is a relatively high oxygen potential during the cooling of sinter ore, and it is easier to produce regenerated hematite during the cooling of sinter ore, resulting in a relatively high low-temperature reduction degradation index of sinter ore, which is not conducive to blast furnace smelting. Summary of the Invention

[0004] This application aims to solve at least one of the technical problems existing in the prior art. For this reason, this application proposes a comprehensive thermal waste gas utilization system and method based on a sintering machine, which can improve the quality of sinter ore, improve the utilization rate of thermal waste gas, cancel the waste gas treatment device of industrial kilns, and greatly save costs.

[0005] In the first aspect, this application provides a comprehensive thermal waste gas utilization system based on a sintering machine, including:

[0006] A sintering machine, including a sintering pallet, a flue, and a purification device. The inlet end of the flue is connected to the sintering pallet, and the outlet end of the flue is connected to the purification device;

[0007] An annular cooler, the feeding end of the annular cooler is connected to the discharging end of the sintering pallet. A jet port facing the material surface is provided at the discharging end of the sintering pallet, and the outlet end of the annular cooler is connected to the jet port;

[0008] A heat recovery device, the outlet end of the annular cooler is also connected to the inlet end of the heat recovery device;

[0009] An industrial kiln, the waste gas outlet of the industrial kiln is connected to the inlet end of the annular cooler.

[0010] According to the hot waste gas comprehensive utilization system based on a sintering machine of the present application, the hot waste gas generated by an industrial furnace can be directly discharged into a ring cooler to assist the ring cooler in cooling sintered ore. Moreover, the hot waste gas with a low oxygen potential can provide a low oxygen potential atmosphere for the sintered ore during cooling, improving the quality of the sintered ore. The waste gas in the ring cooler and the hot waste gas charged into the ring cooler can also be divided into two paths. One path enters a heat energy recovery device to make more use of the waste heat, and the other part is sprayed onto the material surface at the tail of the sintering pallet to provide a low oxygen potential atmosphere condition for the sintered ore, further improving the quality of the sintered ore. Thus, part of the hot waste gas generated by the industrial furnace enters the heat energy recovery device, and part can be discharged and purified through the flue of the sintering machine, and the waste gas treatment device of the industrial furnace can be cancelled, greatly reducing the production and manufacturing cost.

[0011] According to an embodiment of the present application, the hot waste gas comprehensive utilization system based on a sintering machine further includes:

[0012] A mixing device. The air inlet of the mixing device is connected with a first pipeline. There are at least two industrial furnaces. The waste gas outlets of the two industrial furnaces are respectively connected with the first pipeline through a first branch pipe and a second branch pipe. A first control valve is arranged on the first branch pipe, and a second control valve is arranged on the second branch pipe. A first fan is arranged at one end of the first pipeline close to the mixing device;

[0013] The first air outlet of the mixing device is connected with the air inlet end of the ring cooler through a second pipeline. A second fan and a third control valve are arranged on the second pipeline.

[0014] According to an embodiment of the present application, the second air outlet of the mixing device is connected with a jet port through a third pipeline. A fourth control valve is arranged on the third pipeline, and a third fan is arranged at one end of the third pipeline close to the jet port.

[0015] According to an embodiment of the present application, the third air outlet of the mixing device is connected with the air inlet end of the flue through a fourth pipeline. A fifth control valve is arranged on the fourth pipeline.

[0016] According to an embodiment of the present application, the ring cooler includes a high-temperature section, a medium-temperature section, and a low-temperature section arranged in sequence from its feed end to its discharge end. The air outlets of the high-temperature section and the medium-temperature section are connected with the air inlet end of the heat energy recovery device, and the second pipeline is connected with the air inlet of the high-temperature section.

[0017] According to an embodiment of the present application, the air outlet end of the heat energy recovery device is connected with the air inlets of the medium-temperature section and the low-temperature section.

[0018] According to an embodiment of the present application, the air outlet of the medium-temperature section is connected with the jet port through a fifth pipeline. A sixth control valve is arranged on the fifth pipeline.

[0019] Second aspect, the present application provides a comprehensive utilization method of hot waste gas based on a sintering machine. The comprehensive utilization method of hot waste gas applies the comprehensive utilization system of hot waste gas based on a sintering machine as any one of the technical solutions in the first aspect. The comprehensive utilization system of hot waste gas further includes a mixing air device. The air inlet of the mixing air device is connected with a first pipeline. There are at least two industrial kilns. The waste gas outlets of the two industrial kilns are respectively connected with the first pipeline through a first branch pipe and a second branch pipe. A first control valve is arranged on the first branch pipe, and a second control valve is arranged on the second branch pipe. One end of the first pipeline close to the mixing air device is provided with a first fan; The annular cooler includes a high-temperature section, a medium-temperature section, and a low-temperature section arranged in sequence from its feeding end to its discharging end. The first air outlet of the mixing air device is connected with the air inlet of the high-temperature section through a second pipeline. A second fan and a third control valve are arranged on the second pipeline;

[0020] The comprehensive utilization method of hot waste gas includes:

[0021] When the two industrial kilns are operating normally, open the first control valve and the second control valve, and start the first fan. The waste gas discharged from the two industrial kilns enters the mixing air device to be mixed to form hot waste gas with stable atmosphere conditions and temperature;

[0022] Open the third control valve and the second fan. The hot waste gas is transported to the high-temperature section through the second pipeline to assist in cooling the sintered ore in the high-temperature section and provide corresponding low-oxygen potential atmosphere conditions for the sintered ore;

[0023] The waste gas generated by the annular cooler and the hot waste gas of the mixing air device are partially transported to the heat energy recovery device for reuse or power generation through the air outlets of the high-temperature section and the medium-temperature section, and the other part is blown onto the material surface at the discharging end of the sintering machine through the jet orifice, and provide corresponding low-oxygen potential atmosphere conditions for the sintered ore. The hot waste gas entering the sintering machine flows through the flue to the purification device and is discharged after purification.

[0024] According to the comprehensive utilization method of hot waste gas of the present application, the hot waste gas generated by the industrial kiln can be directly discharged into the annular cooler to assist the annular cooler in cooling the sintered ore, and the hot waste gas with low oxygen potential can provide a low-oxygen potential atmosphere for the sintered ore during cooling, improving the quality of the sintered ore. The waste gas in the annular cooler and the hot waste gas filled into the annular cooler can also be divided into two paths, one path enters the heat energy recovery device to utilize the waste heat, and the other part is blown onto the material surface at the tail of the sintering trolley to provide low-oxygen potential atmosphere conditions for the sintered ore, further improving the quality of the sintered ore. Thus, part of the hot waste gas generated by the industrial kiln enters the heat energy recovery device, and part can be discharged and purified through the flue of the sintering machine, and the waste gas treatment device of the industrial kiln can be cancelled, greatly reducing the production and manufacturing cost.

[0025] According to an embodiment of the present application, the second air outlet of the mixing air device is connected with the jet orifice through a third pipeline. A fourth control valve is arranged on the third pipeline, and a third fan is arranged at one end of the third pipeline close to the jet orifice;

[0026] The method for comprehensive utilization of hot waste gas further includes:

[0027] When the sintering machine is operating normally, the cooling machine is malfunctioning, or the waste gas volume of the industrial furnace decreases, close the third control valve and the second fan, and open the fourth control valve and the third fan.

[0028] According to an embodiment of the present application, the third air outlet of the air mixing device is connected to the intake end of the flue through a fourth pipeline, and a fifth control valve is provided on the fourth pipeline;

[0029] The method for comprehensive utilization of hot waste gas further includes:

[0030] When the sintering machine and the cooling machine are shut down, close the third control valve and the second fan;

[0031] Open the fifth control valve, and the hot waste gas is transported to the flue through the fourth pipeline, and flows through the flue to the purification device and is discharged after purification.

[0032] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. Description of the Drawings

[0033] The above and / or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0034] Figure 1 is a structural block diagram of a hot waste gas comprehensive utilization system provided by an embodiment of the present application;

[0035] Figure 2 is a schematic flow chart of a method for comprehensive utilization of hot waste gas provided by an embodiment of the present application.

[0036] Reference Signs:

[0037] 100, hot waste gas comprehensive utilization system; 110, sintering machine; 111, sintering trolley; 1111, discharge end of the sintering trolley; 112, flue; 113, purification device; 120, cooling machine; 121, high temperature section; 122, medium temperature section; 123, low temperature section; 130, heat energy recovery device; 140, industrial furnace; 141, gas fired kiln; 142, sleeve kiln; 150, air mixing device; 161, first pipeline; 162, second pipeline; 163, third pipeline; 164, fourth pipeline; 165, fifth pipeline; 171, first branch pipe; 172, second branch pipe; 181, first control valve; 182, second control valve; 183, third control valve; 184, fourth control valve; 185, fifth control valve; 191, first fan; 192, second fan; 193, third fan. Detailed implementation manners

[0038] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.

[0039] Reference will be made below to Figure 1 describe a comprehensive heat waste gas utilization system based on a sintering machine according to an embodiment of the present application.

[0040] Please refer to Figure 1 , an embodiment of the present application provides a comprehensive heat waste gas utilization system 100 based on a sintering machine 110. The comprehensive heat waste gas utilization system 100 includes a sintering machine 110, a ring cooler 120, a heat energy recovery device 130, and an industrial furnace 140.

[0041] The sintering machine 110 includes a sintering pallet 111, a flue 112, and a purification device 113. The intake end of the flue 112 is connected to the sintering pallet 111, and the outlet end of the flue 112 is connected to the purification device 113; the feed end of the ring cooler 120 is connected to the discharge end 1111 of the sintering pallet, and a jet port facing the material surface is provided at the discharge end 1111 of the sintering pallet. The outlet end of the ring cooler 120 is connected to the jet port; the outlet end of the ring cooler 120 is also connected to the intake end of the heat energy recovery device 130; the waste gas outlet of the industrial furnace 140 is connected to the intake end of the ring cooler 120.

[0042] The sintering machine 110 is composed of a sintering pallet 111, a flue 112, and a purification device 113. The sintering pallet 111 undertakes the key sintering operation. During this process, the waste gas generated is collected by the flue 112. The outlet end of the flue 112 is connected to the purification device 113, which can remove and purify various harmful substances in the waste gas, such as sulfides, nitrogen oxides, and fine particles, through a series of advanced means such as multi-stage filtration, chemical treatment, and physical adsorption, to ensure subsequent waste gas reuse and compliance discharge.

[0043] The feeding end of the annular cooler 120 is connected to the discharging end 1111 of the sintering trolley. The sintered ore on the sintering trolley 111 can enter the annular cooler 120 through the discharging end 1111 of the sintering trolley for cooling. A jet port facing the material surface is provided at the discharging end 1111 of the sintering trolley, and the jet port can accurately spray the hot waste gas onto the material surface. Since the hot waste gas discharged from the annular cooler 120 has the characteristic of low oxygen, when they blow onto the material surface, a unique atmosphere environment with low oxygen potential is created for the sintered ore. Surrounded by this low oxygen atmosphere, the chemical reactions inside the sintered ore are significantly inhibited, especially those reactions that may cause pulverization and oxidation. Specifically, the low oxygen condition reduces the oxidation rate of iron elements and reduces the generation of substances such as hematite that are not conducive to the quality of the sintered ore, thus greatly improving the physical structure stability and chemical property stability of the sintered ore and fundamentally improving the quality of the sintered ore.

[0044] The intake end of the heat energy recovery device 130 is connected to the outlet end of the annular cooler 120. A series of advanced heat exchange equipment and energy conversion components can be equipped inside the heat energy recovery device 130. During the actual operation process, after the high-temperature waste gas discharged from the annular cooler 120 enters the heat energy recovery device 130, with the help of a high-performance heat exchanger, a large amount of heat energy in the waste gas is quickly and efficiently transferred to a specific working medium, such as hot water or steam. After absorbing the heat energy, these working media realize the transformation from heat energy to an available energy form, such as being converted into electric energy for equipment operation or used for district heating, significantly improving the energy utilization efficiency of the entire system and greatly reducing the energy expenditure of the enterprise.

[0045] The waste gas outlet of the industrial kiln 140 is connected to the intake end of the annular cooler 120. The hot waste gas generated by the industrial kiln 140 also has the significant characteristic of low oxygen. The heat energy contained therein can assist the annular cooler 120 in cooling the high-temperature materials that have just entered the annular cooler 120, reducing the dependence on external energy in the cooling process. More importantly, the low oxygen atmosphere environment created by these low oxygen waste gases further inhibits the oxidation and pulverization reactions of the sintered ore during the cooling process. Through this synergistic effect, the overall quality of the sintered ore is significantly improved from multiple dimensions, making it have better physical and chemical properties and being able to better meet the requirements of subsequent production processes.

[0046] In actual operation, the sintering operation is carried out in the sintering pallet car 111. The waste gas generated enters the purification device 113 through the flue 112 for preliminary purification treatment. The sintered ore after sintering enters the annular cooler 120. The low-oxygen hot waste gas of the industrial kiln 140 is input into the annular cooler 120. The annular cooler 120 uses the low-oxygen hot waste gas discharged from the industrial kiln 140 and the cold air generated by itself to cool the sintered ore entering the annular cooler 120. Part of the mixed waste gas in the annular cooler 120 enters the heat energy recovery device 130 for recovery and reuse to generate more power generation heat energy. Part of the mixed waste gas is blown towards the material surface through the jet orifice at the discharge end of the sintering pallet car 111 to provide a low-oxygen atmosphere for the sintered ore about to enter the annular cooler 120. Part of the mixed waste gas entering the sintering machine 110 is finally purified by the purification device 113 and then recovered or discharged into the atmosphere.

[0047] Through such a comprehensive utilization system 100 of hot waste gas with cross-platform pipeline connection, not only the efficient recycling of energy is realized, saving a large amount of operating costs and production inputs for the enterprise, but also by skillfully creating a low-oxygen atmosphere environment, the quality of the sintered ore is essentially improved, the adverse impact on the environment is greatly reduced, bringing extremely significant economic benefits and environmental protection benefits to the enterprise, and becoming a powerful driving force for promoting the sustainable development of the enterprise.

[0048] According to the comprehensive utilization system 100 of hot waste gas based on the sintering machine 110 provided by the embodiment of the present application, the hot waste gas generated by the industrial kiln 140 can be directly discharged into the annular cooler 120 to assist the annular cooler 120 in cooling the sintered ore, and the hot waste gas with low oxygen potential can provide a low-oxygen potential atmosphere for the sintered ore during cooling, changing the cooling medium and improving the quality of the sintered ore. The waste gas in the annular cooler 120 and the hot waste gas charged into the annular cooler 120 can also be divided into two paths, one path enters the heat energy recovery device 130 to make more use of the waste heat, and the other part is blown onto the material surface at the tail of the sintering pallet car 111 to provide a low-oxygen potential atmosphere condition for the sintered ore, further improving the quality of the sintered ore. Part of the hot waste gas generated by the industrial kiln 140 enters the heat energy recovery device 130, and part can be discharged and purified through the flue 112 of the sintering machine 110, and the waste gas treatment device of the industrial kiln 140 can be cancelled, greatly reducing the production and manufacturing costs.

[0049] Please refer to Figure 1 According to some embodiments of the present application, the comprehensive utilization system 100 of hot waste gas may further include a air mixing device 150.

[0050] The air mixing device 150 may be connected with a first pipeline 161 at its air inlet. There may be at least two industrial kilns 140. The exhaust gas outlets of the two industrial kilns 140 may be respectively connected to the first pipeline 161 through a first branch pipe 171 and a second branch pipe 172. A first control valve 181 is provided on the first branch pipe 171, and a second control valve 182 is provided on the second branch pipe 172. One end of the first pipeline 161 close to the air mixing device 150 is provided with a first fan 191. The first air outlet of the air mixing device 150 is connected to the air inlet end of the annular cooler 120 through a second pipeline 162. A second fan 192 and a third control valve 183 are provided on the second pipeline 162.

[0051] The industrial kiln 140 may be a gas-fired kiln 141, a shaft kiln 142, a rotary kiln, a vertical kiln, etc. There are at least two industrial kilns 140, that is, the industrial kiln 140 may have two or more in number. The specific number and specific type are not limited and are determined according to the actual situation.

[0052] Taking the example that there are two industrial kilns 140, and the two industrial kilns 140 are respectively a gas-fired kiln 141 and a shaft kiln 142 for expansion and explanation.

[0053] The exhaust gas outlet of the gas-fired kiln 141 is connected to the first pipeline 161 through the first branch pipe 171. The exhaust gas outlet of the shaft kiln 142 is connected to the first pipeline 161 through the second branch pipe 172. A first control valve 181 is provided on the first branch pipe 171 to precisely control the input amount and input timing of the exhaust gas of the first industrial kiln 140 (gas-fired kiln 141). A second control valve 182 is provided on the second branch pipe 172 to regulate the delivery of the exhaust gas of the second industrial kiln 140 (such as the shaft kiln 142). One end of the first pipeline 161 close to the air mixing device 150 is provided with a first fan 191, which provides sufficient power for the transmission of the exhaust gas. The first fan 191 transports the exhaust gas of the gas-fired kiln 141 and the shaft kiln 142 into the air mixing device 150 for mixing to create stable atmosphere conditions and temperature.

[0054] The first air outlet of the air mixing device 150 is connected to the air inlet end of the annular cooler 120 through the second pipeline 162. A second fan 192 is provided on the second pipeline 162, which enhances the power for transporting the exhaust gas to the annular cooler 120 and ensures that the exhaust gas can stably and efficiently enter the annular cooler 120. The third control valve 183 is used to flexibly adjust the exhaust gas flow rate transported from the air mixing device 150 to the annular cooler 120.

[0055] During actual operation, through the coordinated operation of the first control valve 181 and the second control valve 182, it is possible to accurately control the waste gas input ratio according to various factors such as the waste gas generation amount, temperature, and composition of different industrial kilns 140 (such as gas-fired kiln 141, shaft kiln 142, etc.), so as to meet the requirements of the ring cooler 120 for waste gas with different characteristics. The first fan 191 and the second fan 192 ensure the stable and reliable flow rate and pressure of the waste gas during the entire transmission process, effectively avoiding problems such as poor waste gas flow or insufficient pressure. The third control valve 183 can timely adjust the amount of waste gas entering the ring cooler 120 according to the real-time working state of the ring cooler 120 and the specific requirements of material cooling, thereby optimizing the cooling effect and energy utilization efficiency.

[0056] With the coordinated operation of the air mixing device 150 and each control valve and fan, the entire system realizes the effective integration and precise allocation of waste gas from two or more industrial kilns 140 (such as gas-fired kiln 141, shaft kiln 142, etc.), greatly improving the comprehensive utilization efficiency of hot waste gas, further improving the quality of sintered ore, and reducing the production cost and environmental protection pressure.

[0057] Please refer to Figure 1 , according to some embodiments of the present application, the second air outlet of the air mixing device 150 can be connected to the jet port through the third pipeline 163. A fourth control valve 184 can be provided on the third pipeline 163, and a third fan 193 can be provided at one end of the third pipeline 163 close to the jet port.

[0058] The second air outlet of the air mixing device 150 is connected to the jet port through the third pipeline 163. A fourth control valve 184 is provided on the third pipeline 163 for precisely adjusting the waste gas flow rate transported from the air mixing device 150 to the jet port. A third fan 193 is provided at one end of the third pipeline 163 close to the jet port to provide sufficient power for the waste gas to reach the jet port smoothly.

[0059] During actual operation, when special situations such as reduced maintenance air volume of the shaft kiln 142 or gas-fired kiln 141 or the need to thaw raw materials due to the heat of the ring cooler 120 in winter result in insufficient waste gas heat, through the regulation of the fourth control valve 184, the amount of waste gas transported to the jet port can be flexibly controlled according to the material state at the discharge end of the sintering pallet 111 and the required low-oxygen atmosphere conditions. The third fan 193 ensures the stable flow rate of the waste gas in the third pipeline 163, avoiding situations such as insufficient or unstable waste gas supply, so as to ensure that the jet port can continuously and stably provide hot waste gas with a low oxygen potential for the material surface, effectively inhibiting the pulverization and oxidation of sintered ore and improving the quality of sintered ore.

[0060] Please refer to Figure 1, according to some embodiments of the present application, the third air outlet of the air mixing device 150 may be connected to the inlet end of the flue 112 through the fourth pipeline 164, and a fifth control valve 185 may be provided on the fourth pipeline 164.

[0061] When the sintering trolley 111 or the annular cooler 120 stops due to a fault or other reasons, in order to ensure that the waste gas generated by the industrial furnace 140 can be properly treated, the fifth control valve 185 is opened to directly introduce the waste gas of the industrial furnace 140 into the flue 112. Since the industrial furnace 140 itself is not equipped with a waste gas treatment device, the purification device 113 of the sintering machine 110 is used to purify and discharge these waste gases at this time. It can be understood that when the fifth control valve 185 is opened, the third control valve 183 and the fourth control valve 184 are closed.

[0062] This design can not only flexibly respond to system emergencies, ensure that the waste gas of the industrial furnace 140 can still be effectively purified and treated when the sintering trolley 111 and the annular cooler 120 are not working properly, prevent environmental pollution caused by direct emission of waste gas, but also ensure the stability and safety of the entire production process. More importantly, this solution cancels the original separate waste gas treatment device of the industrial furnace 140, greatly reducing the equipment cost and maintenance cost, and improving the economy and operation efficiency of the entire system.

[0063] Please refer to Figure 1 , according to some embodiments of the present application, the annular cooler 120 may include a high-temperature section 121, a medium-temperature section 122, and a low-temperature section 123 arranged in sequence from its feed end to its discharge end. The air outlets of the high-temperature section 121 and the medium-temperature section 122 are connected to the inlet end of the heat energy recovery device 130, and the second pipeline 162 is connected to the inlet of the high-temperature section 121.

[0064] The annular cooler 120 includes a high-temperature section 121, a medium-temperature section 122, and a low-temperature section 123 arranged in sequence from its feed end to its discharge end. Since the cooling of the sintered ore needs to be carried out step by step to avoid adverse effects on its quality due to sudden temperature drop, the sintered ore passes through the high-temperature section 121, the medium-temperature section 122, and the low-temperature section 123 in sequence after entering the annular cooler 120.

[0065] The air outlets of the high-temperature section 121 and the medium-temperature section 122 are connected to the inlet end of the heat energy recovery device 130, which can fully recover the heat energy in the waste gas discharged in these two stages and achieve efficient utilization of energy.

[0066] The second pipeline 162 is connected to the air inlet of the high-temperature section 121. The waste gas of the industrial furnace 140 first enters the high-temperature section 121. The waste gas of the industrial furnace 140 not only plays a role in increasing the temperature of the high-temperature section 121, but also creates a low-oxygen atmosphere for the high-temperature section 121. Moreover, the low-oxygen hot waste gas entering the high-temperature section 121 will flow along the annular cooler 120 to the medium-temperature section 122 and the low-temperature section 123, making the entire interior of the annular cooler 120 in a low-oxygen atmosphere.

[0067] During the actual operation process, this design enables the annular cooler 120 to better meet the cooling requirements of the sintered ore. The high-temperature section 121 maintains a relatively high temperature with the assistance of the waste gas of the industrial furnace 140, achieving preliminary efficient cooling. As the waste gas flows, the medium-temperature section 122 and the low-temperature section 123 can also complete the cooling process at appropriate temperatures and in a low-oxygen atmosphere, effectively inhibiting the oxidation and pulverization of the sintered ore and improving its quality.

[0068] Please refer to Figure 1 , according to some embodiments of the present application, the air outlet end of the heat energy recovery device 130 can be connected to the air inlets of the medium-temperature section 122 and the low-temperature section 123.

[0069] The waste gas processed by the heat energy recovery device 130 still has a certain temperature. Introducing it into the air inlets of the medium-temperature section 122 and the low-temperature section 123 can continue to provide auxiliary heat energy for the cooling of these two stages, further optimizing the cooling effect and energy utilization efficiency.

[0070] During actual operation, this connection method realizes the cascaded utilization of energy. After the heat energy recovery device 130 recovers part of the heat energy in the waste gas of the high-temperature section 121 and the medium-temperature section 122, the heat energy of the remaining waste gas is reused in the medium-temperature section 122 and the low-temperature section 123, minimizing energy waste to the greatest extent.

[0071] Please refer to Figure 1 , in some embodiments, the air outlet end of the heat energy recovery device 130 can also be connected to the third pipeline 163, so that part of the waste gas discharged from the heat energy recovery device 130 can flow to the jet nozzle and be supplemented to the discharge end 1111 of the sintering trolley together with the waste gas generated by the industrial furnace 140 and the waste gas generated by the annular cooler 120.

[0072] Please refer to Figure 1 , according to some embodiments of the present application, the air outlet of the medium-temperature section 122 is connected to the jet nozzle through the fifth pipeline 165, and a sixth control valve is provided on the fifth pipeline 165.

[0073] The waste gas discharged from the medium-temperature section 122 has a relatively appropriate temperature and is introduced into the jet nozzle through the fifth pipeline 165. The sixth control valve can accurately control the flow rate of the waste gas to ensure that an appropriate gas volume and temperature are provided for the material surface of the sintering trolley 111.

[0074] During actual operation, through the regulation of the sixth control valve, the exhaust gas volume introduced into the jet nozzles from the medium-temperature section 122 can be flexibly adjusted according to the real-time situation of the material surface and the demand for a low-oxygen atmosphere. In this way, it can not only create good low-oxygen atmosphere conditions for the material surface, inhibit the pulverization and oxidation of sinter, and improve its quality, but also avoid adverse effects on the production process caused by excessive or too little gas volume.

[0075] Please refer to Figure 2 , and the embodiment of the present application further provides a method for comprehensive utilization of hot exhaust gas based on the sintering machine 110.

[0076] The method for comprehensive utilization of hot exhaust gas applies the system 100 for comprehensive utilization of hot exhaust gas based on the sintering machine 110 in any of the above technical solutions. Therefore, it has the technical features and beneficial effects of the system 100 for comprehensive utilization of hot exhaust gas based on the sintering machine 110 in any of the above technical solutions, which will not be elaborated here.

[0077] The method for comprehensive utilization of hot exhaust gas includes: step 210, step 220, and step 230.

[0078] Step 210: When the two industrial kilns 140 are operating normally, open the first control valve 181 and the second control valve 182, and start the first fan 191. The exhaust gas discharged from the two industrial kilns 140 enters the air mixing device 150 to be mixed evenly to form hot exhaust gas with stable atmosphere conditions and temperature.

[0079] Step 220: Open the third control valve 183 and the second fan 192. The hot exhaust gas is transported to the high-temperature section 121 through the second pipeline 162 to assist in cooling the sinter in the high-temperature section 121 and provide corresponding low-oxygen potential atmosphere conditions for the sinter.

[0080] Step 230: Part of the exhaust gas generated by the ring cooler 120 and the hot exhaust gas of the air mixing device 150 is transported to the heat recovery device 130 for reuse or power generation through the air outlets of the high-temperature section 121 and the medium-temperature section 122, and the other part is blown onto the material surface at the discharge end of the sintering machine 110 through the jet nozzles and provides corresponding low-oxygen potential atmosphere conditions for the sinter. The hot exhaust gas entering the sintering machine 110 flows through the flue 112 to the purification device 113 and is discharged after purification.

[0081] In step 210, when the two industrial kilns 140 are in normal operating condition, the operator will open the first control valve 181 and the second control valve 182 according to the set program, and start the first blower 191. In this way, the exhaust gas discharged from the two industrial kilns 140 can smoothly enter the air mixing device 150. Since the exhaust gas discharged from the two kilns may vary in composition, temperature, flow rate, etc., through the sufficient mixing effect of the air mixing device 150, hot exhaust gas with uniform and stable atmosphere conditions (such as oxygen content, pressure, etc.) and appropriate temperature is finally formed.

[0082] Subsequently, in step 220, the relevant control personnel will open the third control valve 183 and the second blower 192. Under the coordinated action of these devices, the mixed hot exhaust gas will be accurately conveyed along the second pipeline 162 to the high-temperature section 121 of the ring cooler 120. In the high-temperature section 121, the hot exhaust gas can play a dual role. On the one hand, it assists the existing cooling equipment to cool the high-temperature sintered ore more efficiently and uniformly. On the other hand, it creates a low-oxygen potential atmosphere environment that meets the requirements for the sintered ore. This low-oxygen potential atmosphere can significantly inhibit the quality-unfavorable chemical reactions that may occur inside the sintered ore, such as reducing oxidation and pulverization phenomena, thereby effectively improving the quality of the sintered ore.

[0083] In step 230, during the continuous operation of the system, when the sixth control valve is opened, the exhaust gas generated by the ring cooler 120 itself during the cooling process, as well as the mixed gas of the hot exhaust gas provided by the air mixing device 150 and passing through the high-temperature section 121, will be diverted to different paths according to the system design and control strategy. A part of it will be accurately conveyed to the heat recovery device 130 through the outlets of the high-temperature section 121 and the medium-temperature section 122. Inside the heat recovery device 130, the thermal energy carried by these exhaust gases will be extracted through advanced technical means and converted into an energy form that can be reused, such as electrical energy for driving other equipment or directly used in other production processes that require thermal energy. Another part of the exhaust gas will flow through the fifth pipeline 165 to the jet nozzle and be precisely blown onto the material surface at the discharge end of the sintering machine 110. When this part of the exhaust gas reaches the material surface, it can also provide the necessary low-oxygen potential atmosphere conditions for the sintered ore being cooled, further consolidating and enhancing the effect of inhibiting adverse chemical reactions, ensuring high-quality output of the sintered ore from multiple perspectives. All the hot exhaust gas entering the sintering machine 110 will follow the channels preset by the system, that is, it will stably flow to the purification device 113 through the flue 112. Inside the purification device 113, the hot exhaust gas will undergo a series of carefully designed purification treatment steps, such as filtration, adsorption, chemical reactions, etc., to remove various harmful substances contained in it, such as sulfides, nitrogen oxides, particulate matter, etc. After strict purification treatment to ensure that the hot exhaust gas meets the relevant environmental protection emission standards, it will finally be discharged from the system to achieve environmentally friendly emissions.

[0084] The entire comprehensive utilization method of hot waste gas based on the sintering machine 110, through the close cooperation and precise control of each link, not only realizes the maximum utilization of energy, reduces the enterprise's energy consumption and production costs, but also successfully guarantees the high-quality output of sintered ore. At the same time, it strictly abides by environmental protection regulations, achieving a win-win situation of economic and environmental benefits.

[0085] According to the comprehensive utilization method of hot waste gas provided by the embodiments of the present application, the hot waste gas generated by the industrial kiln 140 can be directly discharged into the ring cooler 120 to assist the ring cooler 120 in cooling the sintered ore. And the hot waste gas with low oxygen potential can provide a low oxygen potential atmosphere for the sintered ore during cooling, improving the quality of the sintered ore. The waste gas in the ring cooler 120 and the hot waste gas charged into the ring cooler 120 can also be divided into two paths. One path enters the heat recovery device 130 to utilize the waste heat, and the other part is sprayed onto the material surface at the tail of the sintering pallet 111 to provide a low oxygen potential atmosphere condition for the sintered ore, further improving the quality of the sintered ore. Thus, part of the hot waste gas generated by the industrial kiln 140 enters the heat recovery device 130, and part can be discharged and purified through the flue 112 of the sintering machine 110, and the waste gas treatment device of the industrial kiln 140 can be cancelled, greatly reducing the production and manufacturing costs.

[0086] According to some embodiments of the present application, the comprehensive utilization method of hot waste gas may further include:

[0087] Step 310: When the sintering machine 110 is operating normally, the ring cooler 120 fails, or the waste gas volume of the industrial kiln 140 decreases, close the third control valve 183 and the second fan 192, and open the fourth control valve 184 and the third fan 193.

[0088] In the actual production process, when the sintering machine 110 is operating normally, but the ring cooler 120 fails, or the waste gas volume of the industrial kiln 140 decreases, or in special cases such as thawing raw materials due to the heat of the ring cooler 120 in winter, resulting in insufficient waste gas heat, by closing the third control valve 183 and the second fan 192, the passage for delivering hot waste gas to the high-temperature section 121 through the second pipeline 162 is cut off. At the same time, open the fourth control valve 184 and the third fan 193 to switch the delivery path of the hot waste gas to be delivered to the jet orifice through the third pipeline 163.

[0089] Such operation adjustments can flexibly respond to unexpected situations during system operation, ensuring that in the case of a failure of the annular cooler 120 or a reduction in the exhaust gas volume of the industrial furnace 140, the hot exhaust gas generated by the industrial furnace 140 can all reach the jet nozzles through the third pipeline 163 and be blown onto the discharge end surface of the sintering machine 110. This creates a specific low oxygen potential atmosphere condition for the sinter ore being cooled. In this low oxygen environment, a series of chemical reactions that are unfavorable to the quality, such as oxidation and pulverization that may occur to the sinter ore, can be significantly inhibited, ensuring the high quality of the sinter ore and ensuring that the sintering machine 110 can operate normally. Thereby ensuring the stability and sustainability of the entire production process, minimizing the adverse impact on production to the greatest extent, and ensuring that the quality of the sinter ore and the environmental protection requirements of production are met.

[0090] According to some embodiments of the present application, the comprehensive utilization method of hot exhaust gas further includes: step 410 and step 420.

[0091] Step 410, when the sintering machine 110 and the annular cooler 120 are shut down, close the third control valve 183 and the second blower 192;

[0092] Step 420, open the fifth control valve 185, and the hot exhaust gas is transported to the flue 112 through the fourth pipeline 164 and flows through the flue 112 to the purification device 113 and is discharged after purification.

[0093] In step 410, when the sintering machine 110 and the annular cooler 120 are shut down, in order to ensure the safety of the system and the reasonable treatment of exhaust gas, corresponding operations need to be taken. First, close the third control valve 183 and the second blower 192 to stop transporting hot exhaust gas to the high temperature section 121.

[0094] In step 420, open the fifth control valve 185 so that the hot exhaust gas can be smoothly transported to the flue 112 through the fourth pipeline 164. These hot exhaust gases will flow through the flue 112 to the purification device 113, and in the purification device 113, they will go through a series of strict purification treatment steps to remove harmful substances and pollutants. After sufficient purification, the exhaust gas that meets the emission standards is finally discharged. Thus, when the sintering pallet 111 and the annular cooler 120 are shut down, the industrial furnace 140 can still operate normally without affecting the production of other processes.

[0095] The terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of this application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same category and do not limit the number of objects. For example, the first object can be one or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / ", generally indicates an "or" relationship between the associated objects before and after.

[0096] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on this application.

[0097] In the description of this application, the "first feature", "second feature" may include one or more of such features.

[0098] In the description of this application, the meaning of "a plurality" is two or more.

[0099] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween.

[0100] In the description of this application, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0101] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0102] Although embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A comprehensive utilization system for hot waste gas based on a sintering machine, characterized in that, Including: A sintering machine, including sintering pallets, a flue and a purification device. The intake end of the flue is connected to the sintering pallets, and the outlet end of the flue is connected to the purification device; An annular cooler, the feeding end of the annular cooler is connected to the discharging end of the sintering pallets. A jet orifice facing the material surface is provided at the discharging end of the sintering pallets, and the outlet end of the annular cooler is connected to the jet orifice; A heat energy recovery device, the outlet end of the annular cooler is also connected to the intake end of the heat energy recovery device; An industrial kiln, the exhaust gas outlet of the industrial kiln is connected to the intake end of the annular cooler.

2. The comprehensive utilization system of hot waste gas based on a sintering machine according to claim 1, characterized in that, Also including: A mixing air device, the intake port of the mixing air device is connected with a first pipeline. There are at least two industrial kilns. The exhaust gas outlets of the two industrial kilns are respectively connected to the first pipeline through a first branch pipe and a second branch pipe. A first control valve is provided on the first branch pipe, a second control valve is provided on the second branch pipe, and a first fan is provided at one end of the first pipeline close to the mixing air device; The first air outlet of the mixing air device is connected to the intake end of the annular cooler through a second pipeline. A second fan and a third control valve are provided on the second pipeline.

3. The comprehensive utilization system of hot waste gas based on a sintering machine according to claim 2, characterized in that, The second air outlet of the mixing air device is connected to the jet orifice through a third pipeline. A fourth control valve is provided on the third pipeline, and a third fan is provided at one end of the third pipeline close to the jet orifice.

4. The comprehensive utilization system of hot waste gas based on a sintering machine according to claim 2, wherein The third air outlet of the mixing air device is connected to the intake end of the flue through a fourth pipeline. A fifth control valve is provided on the fourth pipeline.

5. The comprehensive utilization system of hot waste gas based on a sintering machine according to claim 2, characterized in that The annular cooler includes a high-temperature section, a medium-temperature section and a low-temperature section arranged in sequence from its feeding end to its discharging end. The outlet ends of the high-temperature section and the medium-temperature section are connected to the intake end of the heat energy recovery device, and the second pipeline is connected to the intake port of the high-temperature section.

6. The comprehensive utilization system of hot waste gas based on a sintering machine according to claim 5, characterized in that The outlet end of the heat energy recovery device is connected to the intake ports of the medium-temperature section and the low-temperature section.

7. The comprehensive utilization system of hot waste gas based on a sintering machine according to claim 5, characterized in that, The outlet end of the medium-temperature section is connected to the jet orifice through a fifth pipeline. A sixth control valve is provided on the fifth pipeline.

8. A comprehensive utilization method of hot waste gas based on a sintering machine, characterized in that, Applying the sintering machine-based hot exhaust gas comprehensive utilization system according to any one of claims 1-7, the hot exhaust gas comprehensive utilization system also includes a mixing air device. The intake port of the mixing air device is connected with a first pipeline. There are at least two industrial kilns. The exhaust gas outlets of the two industrial kilns are respectively connected to the first pipeline through a first branch pipe and a second branch pipe. A first control valve is provided on the first branch pipe, a second control valve is provided on the second branch pipe, and a first fan is provided at one end of the first pipeline close to the mixing air device; the annular cooler includes a high-temperature section, a medium-temperature section and a low-temperature section arranged in sequence from its feeding end to its discharging end. The first air outlet of the mixing air device is connected to the intake port of the high-temperature section through a second pipeline. A second fan and a third control valve are provided on the second pipeline; The hot exhaust gas comprehensive utilization method includes: When the two industrial kilns are operating normally, open the first control valve and the second control valve, and start the first fan. The exhaust gas discharged from the two industrial kilns enters the mixing air device to be mixed evenly to form hot exhaust gas with stable atmosphere conditions and temperature; Open the third control valve and the second blower, and the hot waste gas is transported to the high-temperature section through the second pipeline to assist in cooling the sintered ore in the high-temperature section and provide corresponding low-oxygen potential atmosphere conditions for the sintered ore; Part of the waste gas generated by the annular cooler and the hot waste gas of the air mixing device is transported to the heat energy recovery device for reuse or power generation through the air outlets of the high-temperature section and the medium-temperature section, and the other part is blown onto the surface of the material at the discharge end of the sintering machine through the jet nozzles to provide corresponding low-oxygen potential atmosphere conditions for the sintered ore. The hot waste gas entering the sintering machine flows through the flue to the purification device and is discharged after purification.

9. The method for comprehensively utilizing hot waste gas based on a sintering machine according to claim 8, characterized in that, The second air outlet of the air mixing device is connected to the jet nozzle through a third pipeline. A fourth control valve is provided on the third pipeline, and a third blower is provided at one end of the third pipeline close to the jet nozzle; The method for comprehensive utilization of hot waste gas further includes: When the sintering machine is operating normally, the annular cooler fails, or the waste gas volume of the industrial furnace decreases, close the third control valve and the second blower, and open the fourth control valve and the third blower.

10. The comprehensive utilization system of hot waste gas based on a sintering machine according to claim 8, characterized in that The third air outlet of the air mixing device is connected to the intake end of the flue through a fourth pipeline, and a fifth control valve is provided on the fourth pipeline; The method for comprehensive utilization of hot waste gas further includes: When the sintering machine and the annular cooler are shut down, close the third control valve and the second blower; Open the fifth control valve, and the hot waste gas is transported to the flue through the fourth pipeline and flows through the flue to the purification device and is discharged after purification.

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