Cooling zero-emission device and system based on sinter vertical cooler

Abstract

The utility model provides a cooling zero-emission device based on a sinter vertical cooler and a system of the cooling zero-emission device. The cooling zero-emission device comprises a first dust remover, a waste heat boiler, a second dust remover and a circulating cooling fan which are sequentially connected through a pipeline, an inlet of the first dust remover is communicated with a smoke outlet of the vertical cooler, and an outlet pipeline of the circulating cooling fan is communicated with a smoke inlet of the vertical cooler. And the waste gas outlet of the waste heat boiler is also communicated with a circulating flue gas cover on the sintering machine trolley through a thermal circulating flue gas pipeline. The cooling zero-emission device provided by the utility model not only can effectively cool and sinter finished ore and improve the cooling efficiency, but also can fully utilize waste heat of cooling flue gas, reduce fuel consumption of sinter per ton and realize near-zero emission of the cooling flue gas.

Description

Technical Field

[0001] The utility model relates to the technical field of sintering process of iron and steel metallurgy, in particular to a cooling zero-emission device based on a sintered ore vertical cooler and a system thereof. Background Art

[0002] The energy consumption of sintering process accounts for about 15% of the total energy consumption of steel enterprises, ranking second only to the ironmaking process. Therefore, the efficient recovery and utilization of waste heat resources in the sintering process has become an important direction and way to save energy and protect the environment in the sintering process.

[0003] The waste heat resources in the sintering process are mainly composed of two parts: one is the sensible heat of the tail sintered ore, which accounts for about 70% of the total waste heat resources; the other is the sensible heat of the sintering flue gas, which accounts for about 30% of the total waste heat resources. In comparison, the sensible heat of sintered ore is larger in quantity and higher in quality, while the sensible heat of sintering flue gas is smaller in quantity and lower in quality. Based on this, the efficient recovery and utilization of the sensible heat of sintered ore is the core and focus of the entire sintering waste heat recovery and utilization.

[0004] In the modern sintering process, "cooling" is one of the most critical processes. After being roasted by the sintering machine, the sintered ore has formed a high-temperature finished ore. How to protect it without affecting its quality and yield, so that it can be sent to the finished ore bin via a belt conveyor, and at the same time perfectly recycle the sensible heat energy it carries, has always been a problem that technical personnel in the industry have been studying. Based on this, some domestic technical units have proposed a vertical cooling technology for sintered ore, which overcomes the problems of large air leakage rate of the ring cooler, high power consumption of the fan, and low sensible heat recovery rate. However, there is still a phenomenon that the sintered ore cannot be effectively cooled, causing the transfer belt conveyor to burn out; or in order to minimize the temperature of the sintered ore, some flue gas discharge measures after the boiler are selected, causing new environmental pollution and heat waste. Utility Model Content

[0005] The main purpose of the utility model is to provide a cooling zero-emission device and system based on a sintered ore vertical cooler, which aims to effectively cool the sintered finished ore and improve the cooling efficiency, while making full use of the waste heat of the cooling flue gas and reducing the amount of exhaust gas.

[0006] To achieve the above-mentioned purpose, the utility model provides a cooling zero-emission device based on a sintered ore vertical cooler, comprising a first dust collector, a waste heat boiler, a second dust collector and a circulating cooling fan connected in sequence through pipelines, wherein the inlet of the first dust collector is connected to the smoke outlet of the vertical cooler, the outlet pipeline of the circulating cooling fan is connected to the smoke inlet of the vertical cooler, and the exhaust gas outlet of the waste heat boiler is also connected to the circulating smoke hood on the sintering machine trolley through a hot circulating smoke pipe.

[0007] Preferably, a first electric regulating valve is installed between the exhaust gas outlet of the waste heat boiler and the second dust collector.

[0008] Preferably, a second electric regulating valve is installed between the exhaust gas outlet of the waste heat boiler and the circulating flue gas hood.

[0009] Preferably, a hot air circulation fan is installed between the second electric regulating valve and the circulating fume hood.

[0010] Preferably, the circulating cooling fan and the hot air circulating fan are both variable frequency fans.

[0011] Preferably, a third electric regulating valve is installed on the outlet pipe of the circulating fume hood.

[0012] Preferably, a mixed cooling air valve is provided at the inlet of the circulating cooling fan.

[0013] Preferably, the first dust collector adopts gravity dust removal or cyclone dust removal.

[0014] Preferably, the second dust collector adopts double-stage multi-tube dust removal or bag dust removal.

[0015] The utility model further proposes a cooling zero-emission system based on a sintered ore vertical cooler, comprising the above-mentioned cooling zero-emission device based on a sintered ore vertical cooler, and also comprising a buffer bin and a bucket elevator located on the outlet side of a single-roll crusher of the sintering machine, wherein the bucket elevator is used to lift the sintered ore at the outlet of the buffer bin to the upper feed port of the vertical cooler.

[0016] Compared with the current vertical cooling technology, the zero-emission cooling device proposed by the utility model has the following beneficial effects:

[0017] (1) It can cool the sintered ore more effectively and reduce the temperature of the sintered ore, thereby extending the life of the conveyor belt;

[0018] (2) Excess flue gas is sent to the sintering trolley material surface, reducing the amount of exhaust flue gas and achieving near-zero emission of cooling flue gas. The waste heat in the excess flue gas is absorbed by the sintering machine material surface, thereby reducing fuel consumption per ton of sintered ore, improving the quality of sintered ore, and being more energy-saving and environmentally friendly;

[0019] (3) A fully enclosed setting is adopted, and the vertical cooler is controlled to maintain a negative pressure state to reduce smoke overflow and achieve better environmental protection performance;

[0020] (4) The zero-emission cooling device has the advantages of good cooling effect, simple structure and easy implementation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a cooling zero-emission system based on a sintered ore vertical cooler according to the utility model.

[0022] In the figure, 1. single-roll crusher; 2. buffer bin; 3. quantitative ash discharge valve; 4. bucket elevator; 5. vertical cooler; 6. first dust collector; 7. waste heat boiler; 8. first electric regulating valve; 9. second electric regulating valve; 10. second dust collector; 11. mixed cold air valve; 12. circulating cooling fan; 13. hot air circulating fan; 14. hot air circulating duct; 15. third electric regulating valve; 16. circulating fume hood.

[0023] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] It should be noted that in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] The utility model provides a cooling zero-emission device based on a sintered ore vertical cooler.

[0027] Reference Figure 1 In the preferred embodiment, a cooling zero-emission device based on a sintered ore vertical cooler includes a first dust collector 6, a waste heat boiler 7, a second dust collector 10 and a circulating cooling fan 12 which are sequentially connected through pipelines, wherein the inlet of the first dust collector 6 is connected to the flue gas outlet of the vertical cooler 5, the outlet pipe of the circulating cooling fan 12 is connected to the flue gas inlet of the vertical cooler 5, and the exhaust gas outlet of the waste heat boiler 7 is also connected to the circulating flue gas hood 16 of the sintering machine through a hot circulating flue gas pipe.

[0028] Furthermore, a first electric regulating valve 8 is installed between the exhaust gas outlet of the waste heat boiler 7 and the second dust collector 10. A second electric regulating valve 9 is installed between the exhaust gas outlet of the waste heat boiler 7 and the circulating fume hood 16. By setting the first electric regulating valve 8, it is ensured that the fume can be evenly delivered to the material surface of the sintering machine. It should be noted that it is necessary to control the circulating fume hood 16 to maintain a slight negative pressure of 15-30Pa to ensure that the circulating fume does not overflow. At the same time, the vertical cooler 5 maintains a negative pressure state to prevent dust from overflowing.

[0029] Furthermore, a hot air circulation fan 13 is installed between the second electric regulating valve 9 and the circulating fume hood 16 .

[0030] In this embodiment, both the circulating cooling fan 12 and the hot air circulating fan 13 are variable frequency fans. The circulating cooling fan 12 and the hot air circulating fan 13 are used to adjust the air volume of the system.

[0031] Furthermore, a third electric regulating valve 15 is installed on the outlet pipe of the circulating fume hood 16. Specifically, the circulating fume hood 16 is provided with a plurality of openings to respectively install a plurality of inlet pipes, and each of the plurality of inlet pipes is provided with a third electric regulating valve 15. The third electric regulating valve 15 and the second electric regulating valve 9 are provided to balance the air volume of the system and ensure stable operation of the system.

[0032] Furthermore, in order to ensure the cooling effect, a mixed cooling air valve 11 is provided at the inlet of the circulating cooling fan 12. The mixed cooling air valve 11 is interlocked with the finished ore temperature. When the ore temperature is higher than 110°C, the mixed air valve 11 is controlled to open and introduce outdoor air. Otherwise, the mixed air valve 11 is closed, thereby ensuring the cooling effect of the sintered ore.

[0033] In this embodiment, the first dust collector 6 adopts gravity dust removal or cyclone dust removal, and the second dust collector 10 adopts double-stage multi-tube dust removal or bag dust removal.

[0034] The working process of this cooling zero-emission device based on the sinter vertical cooler is as follows:

[0035] After being crushed by the single-roll crusher 1, the finished sintered ore enters the buffer bin 2, and then is lifted to the feed port at the top of the vertical cooler 5 by the quantitative ash discharge valve 3 and the bucket elevator 4. The vertical cooler 5 is blown in from the bottom, and the low-temperature circulating flue gas entering from the bottom cools the sintered ore from bottom to top. The cooled finished ore is discharged from the bottom. The high-temperature flue gas discharged from the flue gas outlet at the top of the vertical cooler 5 is dedusted by the first dust collector 6 and enters the waste heat boiler 7. The waste heat in the high-temperature flue gas is used to produce steam and generate electricity, and the waste heat is recovered. A part of the low-temperature flue gas at the outlet of the waste heat boiler 7 enters the second dust collector 10 for deep purification, and is sent to the bottom of the vertical cooler 5 for circulating cooling through the circulating cooling fan 12.

[0036] Another part of the flue gas at the outlet of the waste heat boiler 7 is sent to the circulating flue gas hood 16 of the sintering machine through the hot air circulation fan 13 and the hot air circulation duct 14 for hot air sintering, thereby reducing the energy consumption of sintering production and improving the quality of sintered ore. Each air supply branch pipe is equipped with a corresponding electric regulating valve to ensure that the flue gas is evenly delivered to the material surface of the sintering machine. The hot air return duct and the cooling flue gas duct are equipped with electric regulating valves to balance the system air volume and ensure stable operation of the system.

[0037] Compared with the current vertical cooling technology, the zero-emission cooling device proposed in this embodiment has the following beneficial effects:

[0038] (1) It can cool the sintered ore more effectively and reduce the temperature of the sintered ore, thereby extending the life of the conveyor belt;

[0039] (2) Excess flue gas is sent to the sintering trolley material surface, reducing the amount of exhaust gas and achieving near-zero emission of cooling flue gas. The waste heat in the excess flue gas is absorbed by the sintering machine material surface, thereby reducing fuel consumption per ton of sintered ore and improving the quality of sintered ore. At the same time, near-zero emission of cooling flue gas is achieved, which is more energy-saving and environmentally friendly.

[0040] (3) A fully enclosed setting is adopted, and the vertical cooler 5 is controlled to maintain a negative pressure state to reduce smoke overflow and achieve better environmental protection performance;

[0041] (4) The zero-emission cooling device has the advantages of good cooling effect, simple structure and easy implementation.

[0042] The utility model further proposes a cooling zero-emission system based on the sintered ore vertical cooler 5 .

[0043] In this preferred embodiment, a cooling zero-emission system based on a sintered ore vertical cooler 5 includes a cooling zero-emission device based on a sintered ore vertical cooler, and also includes a buffer bin 2 and a bucket elevator 4 located at the outlet side of a single-roll crusher 1. The bucket elevator 4 is used to lift the sintered ore at the outlet of the buffer bin 2 to the upper feed port of the vertical cooler 5. The specific structure and beneficial effects of the cooling zero-emission device refer to the above embodiment and will not be repeated here.

[0044] The working process of this cooling zero-emission system is as follows: the finished sintered ore enters the buffer bin 2 after being crushed by the single-roll crusher 1, and the ash discharge valve 3 is set below the buffer bin 2. The finished ore is lifted into the vertical cooler 5 by the bucket elevator 4. The cooled finished ore is discharged from the bottom of the vertical cooler 5. The high-temperature flue gas from the cooling of the sintered ore enters the waste heat boiler 7 for waste heat utilization after dust removal by the first dust collector 6, which is used to produce steam and generate electricity.

[0045] 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 specification and drawings of the present invention, 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 cooling zero-emission device based on a sintered ore vertical cooler, characterized in that: It includes a first dust collector, a waste heat boiler, a second dust collector and a circulating cooling fan which are connected in sequence through pipelines, wherein the inlet of the first dust collector is connected to the smoke outlet of the vertical cooler, the outlet pipeline of the circulating cooling fan is connected to the smoke inlet of the vertical cooler, and the exhaust gas outlet of the waste heat boiler is also connected to the circulating smoke hood on the sintering machine trolley through the hot circulating smoke pipeline.

2. The cooling zero-emission device based on the sintered ore vertical cooler according to claim 1 is characterized in that: A first electric regulating valve is installed between the exhaust gas outlet of the waste heat boiler and the second dust collector.

3. The cooling zero-emission device based on the sintered ore vertical cooler according to claim 1, characterized in that: A second electric regulating valve is installed between the exhaust gas outlet of the waste heat boiler and the circulating fume hood.

4. The cooling zero-emission device based on the sintered ore vertical cooler according to claim 3 is characterized in that: A hot air circulation fan is installed between the second electric regulating valve and the circulating fume hood.

5. The cooling zero-emission device based on the sintered ore vertical cooler according to claim 4, characterized in that: The circulating cooling fan and the hot air circulating fan both adopt variable frequency fans.

6. The cooling zero-emission device based on the sintered ore vertical cooler according to claim 1, characterized in that: A third electric regulating valve is installed on the outlet pipe of the circulating fume hood.

7. The cooling zero-emission device based on the sintered ore vertical cooler according to claim 1, characterized in that: The inlet of the circulating cooling fan is provided with a mixed cooling air valve.

8. The cooling zero-emission device based on the sintered ore vertical cooler according to claim 1, characterized in that: The first dust collector adopts gravity dust removal or cyclone dust removal.

9. The cooling zero-emission device based on the sintered ore vertical cooler according to any one of claims 1 to 8, characterized in that: The second dust collector adopts double-stage multi-tube dust removal or bag dust removal.

10. A cooling zero-emission system based on a sintered ore vertical cooler, characterized in that: It comprises a cooling zero-emission device based on a sintered ore vertical cooler as described in any one of claims 1 to 9, and also comprises a buffer bin and a bucket elevator located on the outlet side of a single-roll crusher of the sintering machine, wherein the bucket elevator is used to lift the sintered ore at the outlet of the buffer bin to the upper feed port of the vertical cooler.

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