Flue gas emission system of circular cooler and circular cooler system

Abstract

The utility model provides a flue gas emission system of a circular cooler and a circular cooler system. The flue gas discharge system of the circular cooler comprises a first circulating pipeline, a second circulating pipeline, a third circulating pipeline and a fourth circulating pipeline; flue gas hood exhaust ports of a first high-temperature section and a second high-temperature section of the circular cooler are communicated with a blower nozzle of the second high-temperature section through the first circulating pipeline; a smoke hood exhaust port of a first low-temperature section of the circular cooler is communicated with a blower nozzle of a second low-temperature section through a second circulating pipeline; a smoke hood exhaust port of a second low-temperature section of the circular cooler is communicated with a blower nozzle of a medium-temperature section through a third circulating pipeline; and an exhaust port of the medium-temperature section of the circular cooler is communicated with an inlet of a smoke hood of the sintering machine through a fourth circulating pipeline so as to exhaust smoke into the sintering machine. According to the flue gas emission system of the circular cooler, a flue gas waste heat utilization technology is combined with a flue gas zero emission system, so that on one hand, the waste heat of flue gas is utilized, the energy consumption of production is reduced, and on the other hand, the harm of flue gas emission to the environment is reduced through multi-stage circulation of the flue gas.

Description

Technical Field

[0001] The utility model relates to the technical field of sintering pellets, in particular to a ring cooler fume exhaust system and a ring cooler system. Background Art

[0002] Sintering and pelletizing are important processes prior to metal smelting. After roasting, the material forms high-temperature sintered pellets, which must be cooled before subsequent transportation and processing. Annular coolers, as the mainstream cooling equipment, are widely used in major sintering and pelletizing plants both domestically and internationally.

[0003] Existing technologies collect and recycle flue gas from the high-temperature and medium-temperature sections of the ring cooler. While this can recover heat and reduce energy consumption, it cannot achieve zero flue gas emissions during operation and still pollutes the environment. In short, existing technologies fail to fundamentally address the environmental hazards posed by flue gas. Utility Model Content

[0004] The main purpose of the utility model is to provide a zero-emission system for flue gas from a refrigerator, aiming to reduce the emission of flue gas and thus reduce the harm caused by the flue gas to the environment.

[0005] To achieve the above-mentioned purpose, the present invention provides a zero-emission system for cold machine flue gas, comprising a first circulation pipeline, a second circulation pipeline, a third circulation pipeline and a fourth circulation pipeline, wherein:

[0006] The fume hood exhaust ports of the first high-temperature section and the second high-temperature section of the ring cooler are connected to the blast port of the second high-temperature section through the first circulation pipe; the fume hood exhaust port of the first low-temperature section of the ring cooler is connected to the blast port of the second low-temperature section through the second circulation pipe; the fume hood exhaust port of the second low-temperature section of the ring cooler is connected to the blast port of the medium-temperature section through the third circulation pipe; the exhaust port of the medium-temperature section of the ring cooler is connected to the fume hood inlet of the sintering machine through the fourth circulation pipe to discharge the flue gas into the sintering machine.

[0007] Preferably, a waste heat boiler and a boiler circulation fan are installed on the first circulation pipeline.

[0008] Preferably, a high-temperature section cooling fan is also installed on the pipeline between the boiler circulation fan and the tuyere of the second high-temperature section.

[0009] Preferably, a medium-temperature section cooling fan is also installed on the third circulation pipeline.

[0010] Preferably, a low-temperature cooling fan is also installed on the second circulation pipeline.

[0011] Preferably, a hot air circulation fan is also installed on the fourth circulation duct.

[0012] Preferably, the annular cooler flue gas exhaust system further comprises a heat exchanger installed above the medium temperature section of the annular cooler, and a smoke hood is installed above the heat exchanger to communicate with the third circulation pipeline.

[0013] Preferably, a first blast flue and a first blast fan are installed at the blast port of the first high-temperature section of the ring cooler.

[0014] Preferably, a second blast flue and a first blast fan are installed at the blast port of the first high-temperature section of the ring cooler.

[0015] The present invention also provides a ring cooler system, comprising the above-mentioned ring cooler fume exhaust system and a ring cooler.

[0016] The flue gas exhaust system of the annular cooler proposed in this utility model has the following beneficial effects:

[0017] 1. By fully combining the flue gas waste heat utilization technology with the flue gas zero emission system, on the one hand, the waste heat of the flue gas is utilized to a great extent to reduce the energy consumption of production. On the other hand, through the multi-stage circulation of flue gas, the effect of basically zero flue gas emission is achieved, thereby reducing the harm to the environment caused by the emission of flue gas;

[0018] 2. The flue gas emission system of this ring cooler is not only complete, but also equipped with corresponding emergency treatment equipment. Even if the system fails due to force majeure, it can still maintain the existing production. The performance of the entire flue gas zero emission system is extremely stable;

[0019] 3. The flue gas emission system of this ring cooler is suitable for both sintered ore and pelletized ore production processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural diagram of the first embodiment of the flue gas exhaust system of the ring cooler of the present invention.

[0021] In the figure, 1-boiler circulation fan, 2-high temperature section cooling fan, 3-medium temperature section cooling fan, 4-low temperature section cooling fan, 5-waste heat boiler, 6-heat exchanger, 7-hot air circulation fan, 8-first circulation pipeline, 9-sintering machine hood, 10-circular cooler, 11-igniter, 12-crusher.

[0022] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0023] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] It should be noted that in the description of the present invention, the terms "transverse," "longitudinal," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for the purpose of facilitating the description of the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] The utility model provides a flue gas exhaust system for an annular cooler.

[0026] The utility model proposes the first embodiment of the ring cooler flue gas exhaust system. Figure 1 In the first embodiment, a flue gas exhaust system for an annular cooler includes a first circulation pipe 8, a second circulation pipe, a third circulation pipe and a fourth circulation pipe, wherein:

[0027] The smoke hood exhaust ports of the first high-temperature section and the second high-temperature section of the ring cooler 10 are connected to the blast port of the second high-temperature section through the first circulation pipe 8; the smoke hood exhaust port of the first low-temperature section of the ring cooler 10 is connected to the blast port of the second low-temperature section through the second circulation pipe; the smoke hood exhaust port of the second low-temperature section of the ring cooler 10 is connected to the blast port of the medium-temperature section through the third circulation pipe; the exhaust port of the medium-temperature section of the ring cooler 10 is connected to the inlet of the sintering machine smoke hood 9 through the fourth circulation pipe to discharge the flue gas into the sintering machine.

[0028] Furthermore, a waste heat boiler 5 and a boiler circulation fan 1 are installed on the first circulation pipe 8. The waste heat boiler 5 recovers heat from the high temperature flue gas discharged from the first high temperature section and the second high temperature section.

[0029] Furthermore, a high-temperature section cooling fan 2 is installed on the pipe between the boiler circulation fan 1 and the tuyere of the second high-temperature section, thereby accelerating the circulation of the flue gas in the first circulation pipe 8 .

[0030] Furthermore, a medium-temperature cooling fan 3 is installed on the third circulation pipeline to accelerate the circulation of the flue gas in the third circulation pipeline.

[0031] Furthermore, a low-temperature cooling fan 4 is installed on the second circulation pipeline to accelerate the circulation of the flue gas in the second circulation pipeline.

[0032] Furthermore, a hot air circulation fan 7 is installed on the fourth circulation pipe to accelerate the circulation of the flue gas in the fourth circulation pipe.

[0033] Furthermore, the annular cooler flue gas exhaust system further includes a heat exchanger 6 installed above the medium temperature section of the annular cooler 10 , and a smoke hood is installed above the heat exchanger 6 to communicate with the third circulation pipeline.

[0034] In this embodiment, the heat exchanger 6 is provided to effectively utilize the flue gas discharged from the medium temperature section, thereby improving the energy utilization rate.

[0035] Furthermore, a first blast flue and a first blast fan are installed at the blast port of the first high temperature section of the ring cooler 10. A second blast flue and a first blast fan are installed at the blast port of the first high temperature section of the ring cooler 10, thereby improving the working efficiency of the ring cooler 10.

[0036] The working process of this annular cooler flue gas exhaust system is as follows: Flue gas at 340°C to 430°C from the high-temperature section (including the first and second high-temperature sections) of the annular cooler 10 is delivered through the first circulation pipe 8 to the waste heat boiler 5, where high- and low-temperature steam is produced. After heat exchange, the flue gas temperature is reduced to approximately 140°C. After being pressurized by the boiler circulation fan 1, it returns to the high-temperature section of the annular cooler 10. The flue gas temperature in the medium-temperature section of the annular cooler 10 is approximately 260°C. After heat exchange in the heat exchanger 6, the flue gas temperature is reduced to approximately 130°C. The hot air circulation fan 7 introduces this flue gas into the circulation flue duct 8 and conveys it to the sintering machine fume hood 9 above the trolley in the middle of the sintering machine. When the sintering machine is operating, its internal reactions absorb harmful substances in the flue gas. Finally, the gas is discharged through the sintering machine's exhaust system. The flue gas temperature in the low-temperature section of the ring cooling is about 130°C. After passing through the chimney and the first circulation pipe 8, the flue gas enters the ring cooling machine 10 again through the medium-temperature section cooling fan 3 of the ring cooling machine 10 to form a closed-loop circulation, achieving zero flue gas emissions.

[0037] The flue gas exhaust system of the annular cooler proposed in this embodiment has the following beneficial effects:

[0038] 1. By fully combining the flue gas waste heat utilization technology with the flue gas zero emission system, on the one hand, the waste heat of the flue gas is utilized to a great extent to reduce the energy consumption of production. On the other hand, through the multi-stage circulation of flue gas, the effect of basically zero flue gas emission is achieved, thereby reducing the harm to the environment caused by the emission of flue gas;

[0039] 2. The flue gas emission system of this ring cooler is not only complete, but also equipped with corresponding emergency treatment equipment. Even if the system fails due to force majeure, it can still maintain the existing production. The performance of the entire flue gas zero emission system is extremely stable;

[0040] 3. The flue gas emission system of this ring cooler can also be applied to the production process of sintered ore and pelletized ore.

[0041] The present invention also proposes a second embodiment of the flue gas emission system of the ring cooler. This embodiment differs from the first embodiment in that some temperature controls are different. The flue gas at the high temperature section of the ring cooler 10, which is 350°C to 430°C, is sent to the waste heat boiler 5 through the first circulation pipe 8 to prepare high- and low-temperature steam. After heat exchange, the flue gas temperature is reduced to about 150°C, and then pressurized by the boiler circulation fan 1 before returning to the high-temperature section material surface of the ring cooler 10. The flue gas temperature in the medium temperature section of the ring cooler 10 is about 260°C. After heat exchange in the heat exchanger 66, the flue gas temperature is reduced to about 140°C. The hot air circulation fan 77 introduces the flue gas into the circulation flue 8 and transports it to the smoke hood 9 above the trolley in the middle of the sintering machine. The flue gas temperature in the low temperature section of the ring cooler is about 140°C. After passing through the chimney and the first circulation pipe 8, the flue gas enters the ring cooler 10 again through the cooling fan 3 of the medium temperature section of the ring cooler to form a closed loop, achieving zero flue gas emissions.

[0042] The utility model also provides a ring cooling machine system.

[0043] In this preferred embodiment, a ring cooler system includes the above-mentioned ring cooler flue gas exhaust system and the ring cooler 10. The specific structure and beneficial effects of the ring cooler flue gas exhaust system refer to the above-mentioned embodiment and will not be repeated here.

[0044] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A flue gas exhaust system for an annular cooler, characterized in that: It includes a first circulation pipeline, a second circulation pipeline, a third circulation pipeline and a fourth circulation pipeline, wherein: The fume hood exhaust ports of the first high-temperature section and the second high-temperature section of the ring cooler are connected to the blast port of the second high-temperature section through the first circulation pipe; the fume hood exhaust port of the first low-temperature section of the ring cooler is connected to the blast port of the second low-temperature section through the second circulation pipe; the fume hood exhaust port of the second low-temperature section of the ring cooler is connected to the blast port of the medium-temperature section through the third circulation pipe; the exhaust port of the medium-temperature section of the ring cooler is connected to the fume hood inlet of the sintering machine through the fourth circulation pipe to discharge the flue gas into the sintering machine.

2. The flue gas exhaust system of the ring cooler according to claim 1, characterized in that: A waste heat boiler and a boiler circulation fan are installed on the first circulation pipeline.

3. The flue gas exhaust system of the ring cooler according to claim 2, characterized in that: A high-temperature section cooling fan is also installed on the pipeline between the boiler circulation fan and the tuyere of the second high-temperature section.

4. The flue gas exhaust system of the annular cooler according to claim 1, characterized in that: A medium-temperature section cooling fan is also installed on the third circulation pipeline.

5. The flue gas exhaust system of the ring cooler according to claim 1, characterized in that: The second circulation pipeline is also equipped with a low-temperature cooling fan.

6. The flue gas exhaust system of the annular cooler according to claim 1, characterized in that: A hot air circulation fan is also installed on the fourth circulation pipeline.

7. The flue gas exhaust system of the ring cooler according to claim 1, characterized in that: It also includes a heat exchanger installed above the medium-temperature section of the ring cooler, and a smoke hood is installed above the heat exchanger to communicate with the third circulation pipeline.

8. The flue gas exhaust system of the ring cooler according to claim 1, characterized in that: A first blast flue and a first blast fan are installed at the blast port of the first high-temperature section of the ring cooler.

9. The flue gas exhaust system of an annular cooler according to any one of claims 1 to 8, characterized in that: A second blast flue and a first blast fan are installed at the blast port of the first high-temperature section of the ring cooler.

10. A ring cooler system, characterized in that: The invention comprises the ring cooler flue gas exhaust system according to any one of claims 1 to 9, and also comprises a ring cooler.

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