Tower-type sinter cooler with fixing distributing device, and sinter cooling method

Abstract

A tower-type cooler comprises a tower body constituted by a feeding section (1), a uniform distributing air-outlet section (2), a cooling section (3) and a uniform discharging blast section (4). A rotating distributing device (8) is arranged at the top end of the feeding section (1), and a discharging outlet (801) of the rotating distributing device (8) downwards extends into the feeding section (1). The uniform distributing air-outlet section (2) is connected with the lower end of the feeding section (1); a hot air annular air channel (6) is arranged on the lower portion of the feeding section (1) and the periphery of the outer side of the uniform distributing air-outlet section (2); the cooling section (3) is arranged below the uniform distributing air-outlet section (2); the uniform discharging blast section (4) is arranged below the cooling section (3); and a plurality of discharging cone hoppers (5) are annularly distributed at the lower end of the uniform discharging blast section (4) or uniformly distributed in the circumferential direction, and discharging equipment is arranged below each discharging cone hopper (5). The tower-type cooler is simple in structure, reliable insealing and high in waste heat recovery efficiency.

Description

technical field [0001] The invention relates to a tower-type sinter cooler with a fixed material distribution device and a sinter cooling method, belonging to the fields of ironmaking and environmental protection. Background technique [0002] In the modern sintering process, "cooling" is one of the most critical processes. After the sintered ore has been roasted by the sintering machine, it has formed a high-temperature finished ore. How can it be protectively cooled without affecting its quality and yield, so that it can be sent to the finished product ore bin through a belt conveyor, and at the same time The perfect recovery and utilization of the sensible heat energy it carries has always been a problem that technicians in the industry have been constantly studying. Since the 1960s, the cooling process of sinter has been developed rapidly, which is mainly divided into three categories: belt cooling, ring cooling and disk cooling. In the late market competition, the str...

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Problems solved by technology

No matter which way you choose, it will cause a high investment cost, which is not cost-effective in terms of economic indicators;

[0007] 2) The open circulation of the air flow leads to low utilization rate of waste heat and pollutes the environment: Since the air flow of the "extraction type longitudinal plate cooling technology" is an open circuit circulation, the air from the waste heat boiler is directly exhausted and not recycled, resulting in more than 100 Sensible heat of the air at a high temperature is wasted, and the discharged air contains a large amount of small particles of dust, causing a certain degree of particulate matter pollution to the atmosphere;

[0008] 3) The material at the feed inlet is severely worn: due to the "ventilated longitudinal plate cooling technology" that sets the material seal at the feed chute, there will be a friction distance between the lower part of the material seal and the upper layer of the material surface in the plate cooler box

At this time, the sintered material is easily pulverized and broken when it is rubbed under the double-layer harsh working conditions of high temperature and upper material column extrusion, thereby reducing the yield of the sintering machine;

[0009] 4) The environmental pollution is serious: due to the negative pressure ventilation technology adopted in the "ventilation type longitudinal plate cooling technology", it does not set a sealing cover device at the lower tray of the box body

In this way, when the sinter is scraped off by the scraper device, it is easy to cause a large number of fine particles and dust to splash

And once the exhaust fan breaks down and repaired, all the material dust pushed around the plate cooler will enter the atmosphere, causing extremely bad influence on the operating environment next to the machine

[0010] 5) The thermal efficiency of the waste heat boiler has not reached the highest: because the "ventilated longitudinal plate cooling technology" does not accurately classify the air passing through the material layer according to the air temperature, but mixes it all into the waste heat boiler, so when the outlet air temperature of the low temperature section is too low , it will inevitably lower the temperature of the air entering the waste heat boiler, thereby reducing the thermal efficiency value of the waste heat boiler

No matter which cooling method is used, the cooling machine has problems such as large air leakage rate, high fan power consumption, low sensible heat recovery rate, and low boiler thermal efficiency.

In other words, in the current environment where the market has increasingly stringent requirements for energy saving and green manufacturing in sinter production, the original equipment structure has been difficult to achieve efficient recovery and utilization of sinter sensible heat

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