Sintering ring cooling low-temperature waste heat recycling system

Abstract

The utility model discloses a sintering ring cooling low-temperature waste heat recycling system which comprises an air suction cover, a heat conveying pipeline, a heat taking fan, a soaking and gas distributing tank, a mixed material groove and a dust remover, and a hot air inlet of the air suction cover is connected with an air taking opening formed in the side wall of a diffusing chimney of a low-temperature section of a ring cooling machine. A hot air outlet of the air suction cover is connected with an air inlet of the soaking and air distributing tank through a heat conveying pipeline, the heat taking fan is installed on the heat conveying pipeline, an air outlet of the soaking and air distributing tank is connected with an air inlet in the side wall of the mixing trough through a hot air conveying pipe, and the dust remover is installed above the mixing trough. According to the utility model, hot air in the diffusion chimney at the low-temperature section of the circular cooler is used for heating the sintering mixture in the mixture tank, so that the solid fuel consumption of the circular cooler can be reduced, the pollutant emission can be reduced, the low-temperature waste heat of the circular cooler can be fully utilized, the waste of energy is reduced, a large amount of steam is prevented from corroding equipment, and the service life of the equipment is prolonged.

Description

Technical Field

[0001] The utility model relates to a recycling system for low-temperature waste heat of sintering ring cooling in a steel enterprise, which can utilize the low-temperature waste heat of the ring cooling to heat smelting raw materials and reduce the solid fuel consumption of the ring cooler, and belongs to the field of energy environmental protection and safety technology. Background Art

[0002] In steel enterprises, sintering process has always played an important role. It not only provides smelting raw materials for blast furnace ironmaking, but also directly affects the quality of blast furnace iron. It is an indispensable and important part of the entire ironmaking process. It is also a major energy consumer and polluter in the entire ironmaking process. At present, most steel mills are designed and installed with ring cooling waste heat power generation equipment to effectively utilize the high-temperature waste heat of ring cooling and convert thermal energy into electrical energy, but the utilization of low-temperature waste heat of about 200°C has always been unsatisfactory. How to make full use of this part of heat energy is something that people have been exploring in recent years. After a lot of production practice, it has been proved that appropriately increasing the temperature of sintering mixed material ore can effectively reduce the solid fuel consumption and pollutant emissions of the sintering process. The existing heating methods of various steel enterprises are generally to add steam or hot water, hot sludge, etc. to the mixture to increase the material temperature. Although these methods can effectively increase the temperature of the mixture, they also have the disadvantages of consuming a lot of steam and accelerating equipment corrosion and damage. Therefore, it is of great significance to design a device to increase the temperature of the mixture by absorbing the waste heat of ring cooling to reduce the solid fuel consumption and pollutant emissions of sintering. Utility Model Content

[0003] The utility model aims to provide a sintering ring cooling low-temperature waste heat recovery system to reduce the sintering solid fuel consumption and reduce pollutant emissions in view of the drawbacks of the prior art.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A sintering ring cooling low-temperature waste heat recovery and utilization system comprises an air suction hood, a heat transfer pipeline, a heat extraction blower, a heat equalizing gas separation tank, a mixing tank and a dust collector, the hot air inlet of the air suction hood is connected to the air intake port opened on the side wall of the emission chimney of the low-temperature section of the ring cooler, the hot air outlet of the air suction hood is connected to the air inlet of the heat equalizing gas separation tank through the heat transfer pipeline, the heat extraction blower is installed on the heat transfer pipeline, the air outlet of the heat equalizing gas separation tank is connected to the air inlet on the side wall of the mixing tank through the heat transfer air duct, and the dust collector is installed above the mixing tank.

[0006] In the above-mentioned sintering ring cooling low-temperature waste heat recovery and utilization system, the end of the heat transfer air duct connected to the heat equalization gas distribution tank is higher than the end connected to the mixing tank.

[0007] In the above-mentioned sintering ring cooling low-temperature waste heat recovery and utilization system, a plurality of heat transfer air ducts are provided, and the air outlets of the plurality of heat transfer air ducts are distributed on the side wall of the mixing tank.

[0008] In the above-mentioned sintering ring cooling low-temperature waste heat recovery and utilization system, the air suction hood is prism-shaped, and its hot air inlet is larger than the hot air outlet.

[0009] In the above-mentioned sintering ring cooling low-temperature waste heat recovery and utilization system, a flow detector and a temperature detector are installed on the heat transfer pipeline, and the flow detector and the temperature detector are located between the heat extraction blower and the heat equalization gas distribution tank.

[0010] In the above-mentioned sintering ring cooling low-temperature waste heat recovery and utilization system, a stop valve and an electric regulating valve are installed on the heat transfer pipeline, and the stop valve and the electric regulating valve are located between the heat extraction blower and the suction hood.

[0011] In the above-mentioned sintering ring cooling low-temperature waste heat recovery and utilization system, the heat extraction blower is a low-pressure centrifugal blower, and the heat equalization gas distribution tank is a horizontally placed cylindrical gas tank.

[0012] The utility model utilizes the hot air in the chimney of the low-temperature section of the ring cooler to heat the sintering mixture in the mixture tank, which can not only reduce the solid fuel consumption of the ring cooler and reduce the emission of pollutants, but also make full use of the low-temperature waste heat of the ring cooler, reduce energy waste, avoid corrosion of equipment by a large amount of steam, and increase the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is the front view of the heat-sparging gas distribution tank and the mixing tank;

[0016] Figure 3 It is a top view of the heat distribution tank and mixing tank.

[0017] The numbers in the figure are as follows: 1. Suction hood; 2. Stop valve; 3. Electric regulating valve; 4. Heat transfer pipeline; 5. Hot air blower; 6. Flow detector; 7. Temperature detector; 8. Heat distribution tank; 9. Mixing tank; 10. Dissipation chimney; 11. Heat transfer air duct; 12. Dust collector; 13. Circular cooler. DETAILED DESCRIPTION

[0018] In view of the problems existing in the prior art, the utility model provides a sintering ring cooling low-temperature waste heat recovery and utilization system, which can reduce the emission of ring cooling waste flue gas, effectively reduce sintering solid fuel consumption and pollutant emissions, and at the same time has the characteristics of simple equipment composition and convenient maintenance, and can meet the needs of the production site.

[0019] See also Figure 1 The utility model mainly includes an air suction hood 1, a stop valve 2, an electric regulating valve 3, a heat transfer pipeline 4, a hot air blower 5, a flow detector 6, a temperature detector 7, a heat-averaging gas distribution tank 8 and a mixing tank 9. The suction hood 1 is installed in the middle of the low-temperature section of the annular cooler chimney 10. The hot air inlet of the suction hood 1 is connected to the air intake port opened on the side wall of the discharge chimney 10. The hot air outlet of the suction hood 1 is connected to the air inlet of the heat-averaging gas separation tank 8 through the heat transfer pipeline 4. The stop valve 2, the electric regulating valve 3, the hot air blower 5, the flow detector 6, and the temperature detector 7 are installed on the heat transfer pipeline 4 in sequence along the hot air flow direction, that is, the inlet end of the stop valve 2 is connected to the hot air outlet of the suction hood 1, the inlet end of the electric regulating valve 3 is connected to the outlet end of the stop valve 2, the inlet end of the hot air blower 5 is connected to the outlet end of the electric regulating valve 3, and the outlet end of the hot air blower 5 is connected to the air inlet of the heat-averaging gas separation tank 8. The temperature detector 7 and the flow detector 6 are installed on the heat transfer pipeline 4 between the hot air blower 5 and the heat-averaging gas separation tank 8.

[0020] The air suction hood 1 provides negative pressure through the hot air blower 5 to extract hot air from the emission chimney 10, obtain the low-temperature waste heat of the ring cooling, and provide a heat source for the entire system.

[0021] The air outlet of the heat-averaging gas separation tank 8 is connected to the air inlet on the side wall of the mixing tank 9 through the heat-transfer air duct 11 , and a dust collector 12 is installed above the mixing tank 9 .

[0022] The air suction cover 1 is prism-shaped and is welded to the air intake port in the middle of the side wall of the emission chimney 10. The heat extractor 5 is a low-pressure centrifugal fan, and the heat-distributing gas tank is a horizontally placed cylindrical gas tank.

[0023] Still viewing Figure 1 The temperature of the hot air extracted by the air suction hood 1 from the emission chimney 10 is about 180-230°C. The hot air is transported to the heat-averaging gas distribution tank 8 through the heat transfer pipeline 4, and the heat-averaging gas distribution tank 8 is used for buffering and stabilizing the pressure.

[0024] See also Figure 1 , Figure 2 and Figure 3 After the hot air enters the heat-averaging gas separation tank 8, the hot air temperature in the tank is about 150-200°C, and is finally transported to the mixing tank 9 through the heat-transfer air pipe 11 on the heat-averaging gas separation tank 8.

[0025] After the hot air is input into the mixing tank 9, it is drawn upward by the dust collector 12 above the mixing tank 9 and then discharged. During the process of the hot air being drawn upward by the dust collector 12, convection is formed with the mixture falling due to gravity, thereby quickly and evenly increasing the material temperature by about 15-25°C. By increasing the temperature of the mixture, the sintering solid fuel consumption can be reduced by about 3-4%, thereby effectively reducing the emission of pollutants such as sulfides and nitrogen oxides during the sintering process.

[0026] A plurality of heat transfer air ducts 11 are installed at the air outlet of the heat equalizing gas separation tank 8. In the present embodiment, 27 heat transfer air ducts 11 are installed in 3 rows and 9 columns. The end of the heat transfer air duct 11 connected to the heat equalizing gas separation tank 8 is higher than the end connected to the mixing material tank 9. The heat transfer air duct 11 is at an angle of about 65° with the vertical direction to prevent the mixed material from flowing back into the heat transfer air duct 11 and clogging the heat transfer air duct 11.

[0027] The stop valve 2 and the electric regulating valve 3 are used to control the heat flow and meet the needs of daily maintenance operations.

[0028] A flow detector 6 and a temperature detector 7 are respectively installed between the hot air blower 5 and the heat-averaging gas distribution tank 8 to realize real-time monitoring of the hot air temperature and air volume.

[0029] The beneficial effect of the utility model is that the temperature of the sintering mixed material can be significantly increased by effectively utilizing the waste heat of the low-temperature section of the ring cooler, thereby effectively reducing the sintering solid fuel consumption and reducing the emission of pollutants.

[0030] The above are only preferred embodiments of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the protection scope of the present invention.

Claims

1. A sintering ring cooling low temperature waste heat recovery and utilization system, characterized in that: The invention comprises an air suction hood (1), a heat transfer pipe (4), a heat extraction blower (5), a heat equalizing gas separation tank (8), a mixing tank (9) and a dust collector (12), wherein the hot air inlet of the air suction hood (1) is connected to an air intake port provided on the side wall of a low-temperature section emission chimney (10) of a ring cooler, the hot air outlet of the air suction hood (1) is connected to an air inlet of the heat equalizing gas separation tank (8) through a heat transfer pipe (4), the heat extraction blower (5) is installed on the heat transfer pipe (4), the air outlet of the heat equalizing gas separation tank (8) is connected to an air inlet port on the side wall of the mixing tank (9) through a heat transfer pipe (11), and the dust collector (12) is installed above the mixing tank (9).

2. According to claim 1, a sintering ring cooling low temperature waste heat recovery and utilization system is characterized in that: The end of the heat transfer air pipe (11) connected to the heat equalizing gas separation tank (8) is higher than the end connected to the mixing tank (9).

3. The sintering ring cooling low temperature waste heat recovery system according to claim 2 is characterized in that: A plurality of heat delivery air pipes (11) are provided, and air outlets of the plurality of heat delivery air pipes (11) are distributed on the side wall of the mixing tank (9).

4. A sintering ring cooling low temperature waste heat recovery system according to any one of claims 1 to 3, characterized in that: The air suction hood (1) is in the shape of a prism, and its hot air inlet is larger than its hot air outlet.

5. The sintering ring cooling low temperature waste heat recovery system according to claim 4 is characterized in that: A flow detector (6) and a temperature detector (7) are installed on the heat transfer pipeline (4), and the flow detector (6) and the temperature detector (7) are located between the heat extraction blower (5) and the heat equalization gas separation tank (8).

6. The sintering ring cooling low temperature waste heat recovery system according to claim 5 is characterized in that: A stop valve (2) and an electric regulating valve (3) are installed on the heat transfer pipeline (4); the stop valve (2) and the electric regulating valve (3) are located between the heat extraction blower (5) and the air suction hood (1).

7. The sintering ring cooling low temperature waste heat recovery system according to claim 6 is characterized in that: The heat extraction blower (5) is a low-pressure centrifugal blower, and the heat equalization gas distribution tank (8) is a horizontally placed cylindrical gas tank.

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