A sintering ring cooling machine low-temperature section flue gas waste heat recycling system

Abstract

The utility model discloses a kind of sintering ring cooling machine low-temperature section flue gas waste heat recycling system, including multiple low-temperature waste heat recovery sections, multiple low-temperature waste heat recovery sections are connected with first dust chamber by the low-temperature flue gas air intake main pipe of installation dust concentration meter, first dust chamber is connected with air preheater by axial fan, and low-temperature flue gas bypass pipeline is shunt with first dust chamber, air preheater is connected with air supply assembly, boiler assembly and general chimney, air supply assembly extracts air into air preheater and mixes into boiler assembly after preheating with low-temperature flue gas, and carries out sufficient combustion with boiler fuel, exhaust gas produced after combustion is discharged from general chimney after being handled by air preheater and dust-removal air induction component, oxygen content detector is associated with electric regulating valve and is set, in the case where large-scale modification and new equipment are not put into, the low-temperature flue gas of sintering ring cooling machine is effectively collected and fully utilized conversion, improve energy recycling efficiency, reduce environmental pollution, realize cost reduction.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of chemical production technology relates to a waste heat recycling system, concretely relates to a sintering circular cooler low temperature section flue gas waste heat recycling system. BACKGROUND

[0002] In the steel industry, the sintering circular cooler is responsible for cooling sintered ore as a post-treatment equipment of sintering process, and a large amount of waste gas and waste heat will be generated in the working process. The existing sintering circular cooler is usually divided into five sections, and the flue gas temperature of the first and second sections is about 300-400℃. The high-temperature flue gas is introduced into a double-pressure waste heat boiler for heat exchange, and the heat-exchanged flue gas is introduced back into the sintering circular cooler to complete the recycling of high-temperature flue gas. The flue gas temperature of the third, fourth and fifth sections is lower than 300℃. If the method of high-temperature section is used for flue gas waste heat recovery, the temperature utilization is difficult. In order to concentrate the recovery and utilization of sintering circular cooler low-temperature section flue gas waste heat resources, several additional equipment and systems need to be added, or the structure of the original waste heat boiler low-temperature section needs to be greatly modified. This not only increases the difficulty of construction, but also the uncertainty of the effect will affect the operation of the whole system, and will increase the investment cost and operating cost. Therefore, most steel enterprises do not recover and utilize the low-temperature section flue gas waste heat, but choose to directly discharge it into the atmosphere, which not only causes great burden to the environment, but also causes serious waste of low-temperature section flue gas waste heat resources. SUMMARY

[0003] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a sintering circular cooler low-temperature section flue gas waste heat recycling system, which can solve the technical problems of high investment and operating cost, pollution of the environment and waste of resources in the recycling of low-temperature section flue gas waste heat.

[0004] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0005] A sintering circular cooler low-temperature section flue gas waste heat recycling system, comprising a sintering circular cooler, wherein the sintering circular cooler comprises a high-temperature waste heat recovery section and a plurality of low-temperature waste heat recovery sections, and a smoke hood partition is arranged between the high-temperature waste heat recovery section and the low-temperature waste heat recovery section connected thereto, characterized in that it further comprises a first dust removal chamber connected with the sintering circular cooler, an air preheater connected with the first dust removal chamber through an axial flow fan, and a supply air assembly, a boiler assembly and a main chimney connected with the air preheater.

[0006] The first dust removal chamber is connected with a low-temperature flue gas air taking main pipe at one end, and is connected with an axial flow fan flue gas inlet pipe at the other end, the axial flow fan flue gas inlet pipe is connected with the input end of the axial flow fan, and the output end of the axial flow fan is connected with an axial flow fan outlet pipe; a plurality of flue gas chimneys are arranged on the low-temperature waste heat recovery sections, and sub flue gas air taking pipes are connected with the flue gas chimneys, and the plurality of sub flue gas air taking pipes are communicated with the low-temperature flue gas air taking main pipe respectively;

[0007] The air preheater is connected with a cold air inlet pipe, a hot air outlet main pipe, a boiler flue gas inlet pipe and a boiler flue gas outlet pipe;

[0008] The cold air inlet pipe is communicated with the axial flow fan outlet pipe, the end of the axial flow fan outlet pipe is connected with the hot air outlet main pipe, the output end of the hot air outlet main pipe is connected with the boiler assembly, the boiler flue gas inlet pipe is communicated with the boiler assembly, and the boiler flue gas outlet pipe is communicated with the total chimney;

[0009] The boiler assembly is connected with a fuel delivery main pipe.

[0010] The utility model also includes the following technical features:

[0011] The low-temperature flue gas air taking main pipe is installed with a dust concentration meter and a first dust removal chamber valve, a low-temperature flue gas bypass pipe is connected between the low-temperature flue gas air taking main pipe and the axial flow fan flue gas inlet pipe, the input end of the low-temperature flue gas bypass pipe is arranged between the dust concentration meter and the first dust removal chamber valve, the output end of the low-temperature flue gas bypass pipe is arranged on the axial flow fan flue gas inlet pipe, and a bypass pipe valve is installed on the low-temperature flue gas bypass pipe.

[0012] Further include dust removal air induction assembly, and the dust removal air induction assembly includes second dust removal chamber and air induction fan, one end of second dust removal chamber is communicated with boiler flue gas outlet pipe through second dust removal chamber inlet pipe, the other end of second dust removal chamber is communicated with the input end of air induction fan through second dust removal chamber outlet pipe, and the output end of air induction fan is connected with total chimney air inlet pipe between total chimney.

[0013] The boiler assembly includes a boiler shell, a boiler hearth is arranged in the boiler shell, a plurality of burners are installed on the boiler hearth, a boiler flue gas discharge pipe is arranged on the top of the boiler hearth, the output end of the boiler flue gas discharge pipe is communicated with the boiler flue gas inlet pipe through the boiler shell, an oxygen content detector is arranged on the side wall of the boiler hearth close to the boiler flue gas discharge pipe, and the output end of the hot air outlet main pipe and the output end of the fuel delivery main pipe all pass through the boiler shell and enter the boiler shell.

[0014] A plurality of said burners are provided with hot air inlet branch pipes and fuel delivery branch pipes, the input ends of a plurality of said hot air inlet branch pipes are communicated with said hot air outlet header, the output ends of hot air inlet branch pipes are connected with corresponding burners, the input ends of a plurality of fuel delivery branch pipes are communicated with said fuel delivery header, and the output ends of fuel delivery branch pipes are connected with corresponding burners.

[0015] An electric regulating valve is installed on the outlet pipeline of the air blower.

[0016] The low-temperature waste heat recovery section is at least three sections.

[0017] A plurality of said flue gas extraction pipelines are provided with flue gas extraction valves.

[0018] A plurality of said flue gas chimneys are provided with flue gas emission valves.

[0019] Compared with the prior art, the utility model has the following technical effects:

[0020] (I) The overall setting of the low-temperature section flue gas waste heat recovery system can effectively collect the low-temperature flue gas of the low-temperature waste heat recovery section of the sintering circular cooler without large-scale modification of the original equipment and investment in new equipment, and fully utilizes the transformation, which improves the energy recycling efficiency, reduces energy waste and environmental pollution, reduces the investment and operation cost, and realizes the sustainable development goal.

[0021] (II) In the low-temperature section flue gas waste heat recovery system, the low-temperature flue gas collected by the low-temperature waste heat recovery section can replace a part of air mixed with hot air preheated by the air preheater, and enter the boiler furnace together to burn with the boiler fuel, and the opening size of the electric regulating valve is controlled by the monitoring result of the oxygen content detector, and the air amount entering the air preheater is further controlled, which can improve the operation efficiency of the boiler and reduce the working load of the air blower, thereby saving the cost of purchasing equipment, reducing the operation and maintenance cost, and realizing the effective reduction of cost.

[0022] (III) The first dust removal chamber in the double dust removal chamber setting can purify the low-temperature flue gas collected by the low-temperature waste heat recovery section, reduce the abrasion of the subsequent equipment and pipeline, ensure the normal operation of the system, prolong the service life of the equipment and pipeline, and reduce the maintenance cost; the second dust removal chamber further purifies the flue gas to be discharged, so that the discharged flue gas meets the environmental protection requirements and reduces the pollution to the environment. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the overall schematic view of the utility model.

[0024] The meanings of the various reference numerals in the figures are as follows:

[0025] 1. High-temperature waste heat recovery section, 2. Low-temperature waste heat recovery section, 3. Hood partition, 4. First dust removal chamber, 5. Axial flow fan, 6. Air preheater, 7. Air supply assembly, 8. Boiler assembly, 9. Main stack, 10. Low-temperature flue gas air intake main pipe, 11. Axial flow fan flue gas inlet pipe, 12. Axial flow fan outlet pipe, 13. Fuel delivery main pipe, 14. Dust concentration meter, 15. First dust removal chamber valve, 16. Low-temperature flue gas bypass pipe, 17. Bypass pipe valve, 18. Dust removal induced draft assembly;

[0026] 21. Flue gas stack, 22. Sub flue gas air intake pipe, 23. Flue gas air intake valve, 24. Flue gas emission valve;

[0027] 71. Air supply fan, 72. Air intake pipe, 73. Air supply fan outlet pipe, 74. Electric regulating valve;

[0028] 61. Cold air inlet pipe, 62. Hot air outlet main pipe, 63. Boiler flue gas inlet pipe, 64. Boiler flue gas outlet pipe, 65. Hot air intake branch pipe;

[0029] 81. Boiler shell, 82. Boiler furnace, 83. Burner, 84. Boiler flue gas pipe, 85. Oxygen content detector;

[0030] 91. Main stack air intake pipe;

[0031] 131. Fuel delivery branch pipe;

[0032] 181. Second dust removal chamber, 182. Induced draft fan, 183. Second dust removal chamber inlet pipe, 184. Second dust removal chamber outlet pipe.

[0033] The specific content of the present application is further explained and described in detail in connection with the following examples. DETAILED DESCRIPTION

[0034] In accordance with the above technical solution, the following specific embodiments of the present application are given, and it should be noted that the present application is not limited to the following specific embodiments, and any equivalent transformation made on the basis of the technical solution of the present application falls within the protection scope of the present application.

[0035] In the present application, unless otherwise stated, the orientation words such as "up", "down", "left", "right" and the like are generally defined with reference to the drawing surface in the corresponding drawing, and "inner" and "outer" refer to the inner and outer contours of the corresponding components.

[0036] Embodiment:

[0037] This embodiment provides a waste heat recovery and utilization system for the low-temperature section of a sintering ring cooler, such as... Figure 1 As shown, it includes a sintering ring cooler, which includes a high-temperature waste heat recovery section 1 and multiple low-temperature waste heat recovery sections 2. A smoke collection hood partition 3 is provided between the high-temperature waste heat recovery section 1 and the low-temperature waste heat recovery section 2 connected to it. It also includes a first dust removal chamber 4 connected to the low-temperature waste heat recovery section 2. The first dust removal chamber 4 is connected to an air preheater 6 through an axial flow fan 5. An air supply assembly 7, a boiler assembly 8 and a main chimney 9 are connected to the air preheater 6.

[0038] One end of the first dust removal chamber 4 is connected to a low-temperature flue gas intake main duct 10, and the other end of the first dust removal chamber 4 is connected to an axial flow fan flue gas inlet duct 11. The axial flow fan flue gas inlet duct 11 is connected to the input end of the axial flow fan 5, and the output end of the axial flow fan 5 is connected to an axial flow fan outlet duct 12. Each of the multiple low-temperature waste heat recovery sections 2 is equipped with a flue gas chimney 21, and a sub-flue gas intake duct 22 is connected to the flue gas chimney 21. The multiple sub-flue gas intake ducts 22 are respectively connected to the low-temperature flue gas intake main duct 10.

[0039] The air supply assembly 7 includes a blower 71, with an air inlet duct 72 connected to the input end of the blower 71 and an air outlet duct 73 connected to the output end of the blower 71; the air preheater 6 is connected to a cold air inlet duct 61, a hot air outlet main duct 62, a boiler flue gas inlet duct 63, and a boiler flue gas outlet duct 64.

[0040] The cold air inlet pipe 61 is connected to the blower outlet pipe 73, the end of the axial flow fan outlet pipe 12 is connected to the hot air outlet main pipe 62, the output end of the hot air outlet main pipe 62 is connected to the boiler assembly 8, the boiler flue gas inlet pipe 63 is connected to the boiler assembly 8, and the boiler flue gas outlet pipe 64 is connected to the main chimney 9.

[0041] The boiler assembly 8 is connected to a fuel delivery main pipe 13.

[0042] In this embodiment, the high-temperature flue gas and the low-temperature flue gas discharged from the sintering ring cooler are separated by the hood partition 3 to avoid heat exchange caused by convection between the low-temperature flue gas in the low-temperature waste heat recovery section 2 and the high-temperature flue gas in the high-temperature waste heat recovery section 1, thereby affecting the sintering ring cooler high-temperature section flue gas waste heat recovery efficiency, improving the energy utilization rate of the entire system, achieving the purpose of energy saving and emission reduction, and different temperature low-temperature flue gas is collected into the corresponding flue gas chimney 21 by multiple low-temperature waste heat recovery sections 2, and the collected different low-temperature flue gas is further collected into the low-temperature flue gas air intake main pipe 10 through the corresponding sub-flue gas air intake pipe 22, and after mixing together in the low-temperature flue gas air intake main pipe 10, it enters the first dust removal chamber 4 for purification treatment, and the treated low-temperature mixed flue gas is pressurized by the axial flow fan 5 and enters the hot air outlet main pipe 62 of the air preheater 6; the air supply assembly 1 The air supply fan 71 draws the air outside through the air inlet pipe 72 into the air supply fan outlet pipe 73, and the air is further sent to the air preheater 6 through the cold air inlet pipe 61 for preheating, and the hot air after preheating flows into the boiler assembly together with the low-temperature mixed flue gas in the hot air outlet main pipe 62, and at the same time, the boiler fuel is transported to the boiler assembly 8 through the fuel delivery main pipe 13, and the mixed hot air and boiler fuel are burned in the boiler assembly 8, and the flue gas after combustion is discharged to the outside in turn through the boiler flue gas inlet pipe 63, the air preheater 6, the boiler flue gas outlet pipe 64 and the main chimney 9. The first dust removal chamber 4 can purify the collected mixed low-temperature flue gas, reduce the wear and tear on the subsequent equipment and pipes, ensure the normal operation of the system, prolong the service life, reduce the maintenance cost, and the air supply fan 71 can be provided with two, one for use and one for standby, which is convenient for maintenance without affecting the operation of the system.

[0043] In a preferred embodiment, a dust concentration meter 14 and a first dust removal chamber valve 15 are installed on the low-temperature flue gas intake main duct 10. A low-temperature flue gas bypass duct 16 connects the low-temperature flue gas intake main duct 10 and the axial flow fan flue gas inlet duct 11. The input end of the low-temperature flue gas bypass duct 16 is located between the dust concentration meter 14 and the first dust removal chamber valve 15, and the output end of the low-temperature flue gas bypass duct 16 is located on the axial flow fan flue gas inlet duct 11. A bypass duct valve 17 is installed on the low-temperature flue gas bypass duct 16. The dust concentration meter 14 can detect the dust concentration of the mixed low-temperature flue gas in the low-temperature flue gas intake main duct 10. The detection results are interlocked with the first dust removal chamber valve 15 and the bypass pipeline valve 17. If the detected results have a serious impact on the use of subsequent equipment and pipelines, the first dust removal chamber valve 15 is opened and the bypass pipeline valve 17 is closed. The mixed low-temperature flue gas is introduced into the first dust removal chamber 4 for purification before use. If the detected results have a minor impact on the use of subsequent equipment and pipelines, the bypass pipeline valve 17 is opened and the first dust removal chamber valve 15 is closed. The mixed low-temperature flue gas is directly led from the low-temperature flue gas bypass pipeline 16 to the axial flow fan 5. The subsequent operation is selected based on the detection results of the dust concentration meter 14, which can save operating costs to a certain extent.

[0044] As a preferred embodiment, this embodiment also includes a dust removal and induced draft assembly 18. The dust removal and induced draft assembly 18 includes a second dust removal chamber 181 and an induced draft fan 182. One end of the second dust removal chamber 181 is connected to the boiler flue gas outlet pipe 64 through the second dust removal chamber inlet pipe 183, and the other end of the second dust removal chamber 181 is connected to the input end of the induced draft fan 182 through the second dust removal chamber outlet pipe 184. The output end of the induced draft fan 182 is connected to the main chimney 9 through the main chimney inlet pipe 91. The flue gas discharged from the boiler assembly 8 is introduced into the second dust removal chamber 181 through the second dust removal chamber inlet pipe 183 for further purification. After the purified flue gas meets the environmental protection requirements, it is introduced into the induced draft fan 182. After being pressurized by the induced draft fan 182, it is discharged to the outside through the main chimney inlet pipe 91 and the main chimney 9, reducing environmental pollution. In this embodiment, two induced draft fans 182 can be set up, one for use and one for standby, so that the operation of the system is not affected during maintenance.

[0045] As a preferred scheme of the embodiment, the boiler assembly 8 in the embodiment comprises a boiler shell 81, a boiler furnace 82 is arranged in the boiler shell 81, a plurality of burners 83 are arranged on the boiler furnace 82, a boiler flue gas duct 84 is arranged at the top of the boiler furnace 82, the output end of the boiler flue gas duct 84 penetrates through the boiler shell 81 and is communicated with the boiler flue gas inlet duct 63, an oxygen content detector 85 is arranged on the side wall of the boiler furnace 82 close to the boiler flue gas duct 84, and the output end of the hot air outlet main pipe 62 and the output end of the fuel delivery main pipe 13 both penetrate through the boiler shell 81 and enter into the boiler shell 81;

[0046] The plurality of burners 83 are respectively provided with hot air inlet branch pipes 65 and fuel delivery branch pipes 131, the input ends of the plurality of hot air inlet branch pipes 65 are communicated with the hot air outlet main pipe 62, the output ends of the hot air inlet branch pipes 65 are connected with the corresponding burners 83, and the input ends of the plurality of fuel delivery branch pipes 131 are communicated with the fuel delivery main pipe 13, and the output ends of the fuel delivery branch pipes 131 are connected with the corresponding burners 83.

[0047] The mixed hot air in the hot air outlet main pipe 62 enters into the corresponding burners 83 through the plurality of hot air inlet branch pipes 65, at the same time, the boiler fuel enters into the corresponding burners 83 through the plurality of fuel delivery branch pipes 131, and the boiler fuel and the mixed hot air enter into the boiler furnace 82 through the burners 83 to be combusted. In the operation process of the boiler assembly 8, the high-temperature flue gas generated by the combustion flows along the flue gas channel inside the boiler assembly 8, is converted after energy conversion, and is finally discharged through the boiler flue gas duct 84 and communicated with the subsequent equipment. The oxygen content detector 85 is arranged to monitor the oxygen content in the flue gas generated after the combustion in the boiler furnace 82 in real time, and the air quantity entering into the boiler furnace 82 is adjusted according to the monitored value to be greater than the air quantity required by the boiler fuel, so as to realize the full combustion of the boiler fuel, improve the operation efficiency of the boiler assembly 8, and reduce the pollution to the environment.

[0048] Further, the electric regulating valve 74 is arranged on the air supply fan outlet duct 73. According to the monitoring result fed back by the oxygen content detector 85, the air quantity entering into the air preheater 6 is automatically adjusted through the electric regulating valve 74. Since the flue gas quantity of the sintering circular cooler low-temperature section is fluctuant, the mixed hot air entering into the hot air outlet main pipe 62 is also unstable. In order to ensure the full combustion of the boiler fuel in the boiler furnace 82, the electric regulating valve 74 is connected with the oxygen content detector 85 in a interlocking manner. If the value measured by the oxygen content detector 85 is less than the set value, the opening of the electric regulating valve 74 is increased to increase the air quantity. If the value measured by the oxygen content detector 85 is greater than the set value, the opening of the electric regulating valve 74 is reduced to reduce the air quantity. The air quantity entering into the air preheater 6 is dynamically adjusted, the normal operation of the boiler assembly 8 is effectively ensured, and the operation efficiency of the boiler assembly 8 is improved.

[0049] Since part of the mixed hot air in the boiler furnace 82 is replaced by low-temperature mixed flue gas, which replaces part of the air originally required to be obtained from the external air, the amount of air extracted from the external air by the air blower 71 is reduced, the working load of the air blower 71 is correspondingly reduced, the equipment selection of the air blower 71 is optimized, the purchase cost of the equipment is saved, the subsequent operation and maintenance cost is saved, and the cost is effectively reduced.

[0050] As a preferred scheme of the embodiment, the low-temperature waste heat recovery section 2 in the embodiment is at least three sections, and the low-temperature flue gas discharged by the sintering cooling machine can be recovered in sections, the sintering flue gas discharge pressure of the sintering circular cooling machine is reduced, the cooling effect of the low-temperature section of the sintering circular cooling machine is ensured, and stable operation is realized.

[0051] As a preferred scheme of the embodiment, the low-temperature waste heat recovery section 2 in the embodiment is at least three sections, and the low-temperature flue gas discharged by the sintering cooling machine can be recovered in sections, the sintering flue gas discharge pressure of the sintering circular cooling machine is reduced, the cooling effect of the low-temperature section of the sintering circular cooling machine is ensured, and stable operation is realized.

[0052] Further, the plurality of flue gas chimneys 21 are each provided with a flue gas emission valve 24, the installation position of the flue gas emission valve 24 is higher than that of the flue gas air intake valve 23, when the boiler assembly 8 has an accident or needs to be overhauled, each flue gas air intake valve 23 is closed, and each flue gas emission valve 24 is opened, the low-temperature flue gas discharged by the sintering circular cooling machine is emitted through each flue gas chimney 21, and the normal operation of the sintering circular cooling machine is ensured. When the boiler assembly 8 is normally operated, each flue gas emission valve 24 is closed, and each flue gas air intake valve 23 is opened, the low-temperature flue gas discharged by the sintering circular cooling machine is introduced into the low-temperature flue gas air intake main pipe 10, and subsequent waste heat utilization work is performed.

[0053] The type of the boiler assembly 8 in the embodiment includes but is not limited to a conventional pulverized coal boiler, a circulating fluidized bed boiler, a gas-fired boiler, and the like.

[0054] The first dust removal chamber 4 and the second dust removal chamber 181 in the embodiment include but are not limited to an electrostatic dust removal chamber, a bag-type dust removal chamber, a wet dust removal chamber, and the like.

Claims

1. A waste heat recovery system for the low-temperature section of a sintering ring cooler, comprising a sintering ring cooler, wherein the sintering ring cooler includes a high-temperature waste heat recovery section (1) and multiple low-temperature waste heat recovery sections (2), wherein a fume hood baffle (3) is provided between the high-temperature waste heat recovery section (1) and the low-temperature waste heat recovery section (2) connected thereto, characterized in that, It also includes a first dust removal chamber (4) connected to the low-temperature waste heat recovery section (2), the first dust removal chamber (4) is connected to an air preheater (6) via an axial flow fan (5), and the air preheater (6) is connected to an air supply assembly (7), a boiler assembly (8) and a main chimney (9); One end of the first dust removal chamber (4) is connected to a low-temperature flue gas intake main pipe (10), and the other end of the first dust removal chamber (4) is connected to an axial flow fan flue gas inlet pipe (11). The axial flow fan flue gas inlet pipe (11) is connected to the input end of the axial flow fan (5), and the output end of the axial flow fan (5) is connected to an axial flow fan outlet pipe (12). Each of the multiple low-temperature waste heat recovery sections (2) is equipped with a flue gas chimney (21), and a sub-flue gas intake pipe (22) is connected to the flue gas chimney (21). The multiple sub-flue gas intake pipes (22) are respectively connected to the low-temperature flue gas intake main pipe (10). The air supply assembly (7) includes a blower (71), the input end of which is connected to an air inlet duct (72), and the output end of which is connected to a blower outlet duct (73); the air preheater (6) is connected to a cold air inlet duct (61), a hot air outlet main duct (62), a boiler flue gas inlet duct (63), and a boiler flue gas outlet duct (64); The cold air inlet pipe (61) is connected to the blower outlet pipe (73), the end of the axial flow fan outlet pipe (12) is connected to the hot air outlet main pipe (62), the output end of the hot air outlet main pipe (62) is connected to the boiler assembly (8), the boiler flue gas inlet pipe (63) is connected to the boiler assembly (8), and the boiler flue gas outlet pipe (64) is connected to the main chimney (9). The boiler assembly (8) is connected to a fuel delivery main (13).

2. The sintering ring cooler low-temperature section flue gas waste heat recovery and utilization system as described in claim 1, characterized in that, A dust concentration meter (14) and a first dust removal chamber valve (15) are installed on the low-temperature flue gas intake main pipe (10). A low-temperature flue gas bypass pipe (16) is connected between the low-temperature flue gas intake main pipe (10) and the axial flow fan flue gas inlet pipe (11). The input end of the low-temperature flue gas bypass pipe (16) is located between the dust concentration meter (14) and the first dust removal chamber valve (15). The output end of the low-temperature flue gas bypass pipe (16) is located on the axial flow fan flue gas inlet pipe (11). A bypass pipe valve (17) is installed on the low-temperature flue gas bypass pipe (16).

3. The sintering ring cooler low-temperature section flue gas waste heat recovery and utilization system as described in claim 2, characterized in that, It also includes a dust removal and induced draft assembly (18), which includes a second dust removal chamber (181) and an induced draft fan (182). One end of the second dust removal chamber (181) is connected to the boiler flue gas outlet pipe (64) through the second dust removal chamber inlet pipe (183), and the other end of the second dust removal chamber (181) is connected to the input end of the induced draft fan (182) through the second dust removal chamber outlet pipe (184). The output end of the induced draft fan (182) is connected to the main chimney (9) through the main chimney inlet pipe (91).

4. The sintering ring cooler low-temperature section flue gas waste heat recovery and utilization system as described in claim 2, characterized in that, The boiler assembly (8) includes a boiler shell (81), a boiler furnace (82) is provided inside the boiler shell (81), a plurality of burners (83) are installed on the boiler furnace (82), a boiler exhaust pipe (84) is provided at the top of the boiler furnace (82), the output end of the boiler exhaust pipe (84) passes through the boiler shell (81) and is connected to the boiler flue gas inlet pipe (63), an oxygen content detector (85) is provided on the side wall of the boiler furnace (82) near the boiler exhaust pipe (84), and the output end of the hot air outlet main pipe (62) and the output end of the fuel delivery main pipe (13) both pass through the boiler shell (81) and enter the boiler shell (81); Each of the burners (83) is provided with a hot air inlet branch pipe (65) and a fuel delivery branch pipe (131). The input end of each of the hot air inlet branch pipes (65) is connected to the hot air outlet main pipe (62), and the output end of each of the hot air inlet branch pipes (65) is connected to its corresponding burner (83). The input end of each of the fuel delivery branch pipes (131) is connected to the fuel delivery main pipe (13), and the output end of each of the fuel delivery branch pipes (131) is connected to its corresponding burner (83).

5. The sintering ring cooler low-temperature section flue gas waste heat recovery and utilization system as described in claim 4, characterized in that, An electric regulating valve (74) is installed on the outlet pipe (73) of the blower.

6. The sintering ring cooler low-temperature section flue gas waste heat recovery and utilization system as described in claim 2, characterized in that, The low-temperature waste heat recovery section (2) consists of at least three sections.

7. The sintering ring cooler low-temperature section flue gas waste heat recovery and utilization system as described in claim 2, characterized in that, Each of the aforementioned sub-flue gas intake ducts (22) is equipped with a flue gas intake valve (23).

8. The sintering ring cooler low-temperature section flue gas waste heat recovery and utilization system as described in claim 2, characterized in that, Each of the aforementioned flue gas chimneys (21) is equipped with a flue gas vent valve (24).

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