A comprehensive utilization system of sintering waste heat

Abstract

A comprehensive utilization system for sintering waste heat comprises a cooling tower, a fine powder separator, a waste heat boiler, an induced draft fan, an air intake peripheral pipe and a cold air negative-pressure pipe. The air intake peripheral pipe is arranged on the periphery of the middle-lower part of the cooling tower, the air intake peripheral pipe is communicated with the interior of the cooling tower through air inlets arranged along the circumference at intervals, and the air intake peripheral pipe is connected with the induced draft fan through an air intake pressurization pipe. The cold air negative-pressure pipe is arranged above a discharging port of the cooling tower, the cold air negative-pressure pipe is connected with a cooling air blower through a cold air intake pipe, the cooling air blower is simultaneously connected with a cold air pressurization pipe located below the air intake peripheral pipe, and the cold air negative-pressure pipe and the cold air pressurization pipe are both communicated with the interior of the cooling tower. A material distribution area and a cooling area located below the material distribution area are formed in the cooling tower, a feeding port is formed in the top of the cooling tower, and the discharging port is formed in the bottom of the cooling tower. A material receiving seal valve is arranged in the cooling tower and located below the feeding port. A material distribution seal valve is arranged in the cooling tower and located above the opening of the material distribution area. According to the comprehensive utilization system for the sintering waste heat, secondary hot air generated in the cooling process can be recycled, energy consumption is reduced, and environmental pollution is completely eradicated.

Description

technical field [0001] The invention relates to metallurgical cooling equipment, in particular to a waste heat comprehensive utilization system matched with sintering equipment. Background technique [0002] The sintering system is a large-scale equipment that provides high-quality raw materials for the blast furnace. Among them, the cooling of the sintered finished ore is the biggest bottleneck affecting the sintering cost. In the case of weak steel market, energy saving, high efficiency and environmental protection are the primary considerations of every steel plant. Studies have shown that the waste heat of flue gas from the main flue of the sintering machine accounts for about 13% to 23% of the energy consumption of the sintering process, and the waste heat of the exhaust gas of the cooler accounts for 19% to 35% of the energy consumption of the sintering process, and the sum of the two is as high as 50%. The production of secondary energy is 1.62GJ / ton. It can be seen...

AI Technical Summary

Problems solved by technology

For example, the Chinese invention patent application with the application number 201310419503.8 and the name of the invention as a vertical cooling kiln discloses a vertical cooling kiln. Air supply, in this way, because the air enters through the air duct and the hood, the wind resistance is large, and the air volume cannot be adjusted, so the air duct near the air inlet has a large air volume, while the air duct far away from the air inlet has a small air volume. Affects the heat replacement of sintered ore; similarly, the air outlet is on one side above the vertical kiln, and the single air outlet also forms a large local air volume and a small local air volume, resulting in differences in cooling effects at different positions

At the same time, the production and maintenance costs of the air duct and hood are high, the operating cost is high, the maintenance workload is heavy, and the kiln life is short, which is not conducive to the stable operation of the sintering machine

[0006] The patent number is 200910187381.8, and the invention name is the vertical tank type recovery device and utilization method of waste heat resources in the sintering process. The air intake also has the problem of large wind resistance and the inability to adjust the air volume, the partial air volume of the air outlet is different, and the cooling effect is inconsistent

Moreover, since there is no air volume adjustment device in the air inlet duct, the air intake volume cannot be adjusted, and the air outlet of the air duct discharges air from one side, which is easy to form a short circuit of the air flow, resulting in poor local cooling effect

Moreover, due to the accumulation of materials in the air duct, it is easy to produce pressure measurement, which will crush the air duct and affect production.

High manufacturing cost, difficult maintenance, short furnace life

[0007] The application number is 201410280340.4, and the invention name is the vertical spiral cross-flow cooling heat exchange device and its method for sintering waste heat power generation system. The Chinese invention patent application discloses a vertical cooling heat exchange device, which is designed with a pre-storage section and cooling section, and use the self-weight of the material to slide down the spiral surface to the discharge port through the spiral channel. During the sliding process, due to the high friction resistance of the sintered material, it is easy to cause damage to the spiral slideway and blockage of the material. Once such In this case, the system will be paralyzed; the air inlet and outlet are also on one side of the device, and the air volume cannot be adjusted. In the case of insufficient material filling, it is easy to form a short circuit of local air flow and directly enter the return air outlet, so the current of the fan increases. , power consumption increases, cooling effect decreases

There are many air outlets on the edge of the central air inlet pipe, forming a weak link in the air outlet main pipe. The air outlet is easy to enter small materials, and increases the impact damage of materials on the diameter of the pipe.

High production cost and high maintenance cost, which is not conducive to long-term operation

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