A stepped self-sealing waste heat recovery system

Abstract

The invention discloses a step-type self-sealing waste heat recovery system which comprises a hot air hood and a hot air pipeline system, wherein the hot air hood is internally provided with a built-in flue; the hot air hood is provided with a fume sucking port; the built-in flue, the fume sucking port and the hot air pipeline system are sequentially connected; the lower part of the built-in flue is provided with a strip-shaped air sucking port for sucking hot air; the built-in flue is divided into a plurality of built-in sub-flues by a plurality of flue partitions along the length direction of the air sucking port; each built-in sub-flue is provided with an independent air sucking sub-port; the fume sucking port is internally divided into fume sucking sub-ports corresponding to the built-in sub-flues by a plurality of fume sucking port partitions; the built-in sub-flues are communicated with the corresponding fume sucking sub-ports. The step-type self-sealing waste heat recovery system is capable of effectively preventing external environments from influencing the waste heat recovery system, preventing external cold air from being sucked, eliminating a fume turbulent condition in the hot air hood, greatly improving the fume waste heat recovery rate of a sintering cooling machine and achieving the purpose of fully utilizing waste heat resources.

Description

Technical field: [0001] The invention belongs to the field of flue gas waste heat recovery, and in particular relates to a stepped self-sealing waste heat recovery system which can improve the waste heat recovery efficiency of a sintering cooler. Background technique: [0002] Since my country introduced sinter cooler waste heat power generation technology from abroad in the late 1990s, after more than 10 years of development, many sinter cooler waste heat power stations have been built in China. But so far, most power plants have fallen far short of expected performance indicators. The root cause is that the biggest technical difficulty lies in the air leakage treatment between the hot air hood of the sintering cooler and the trolley and the flow field control of the high-temperature flue gas in the hot air hood. Based on the characteristics of the hot air hood of the cooling machine and the trolley moving and resting, there is a gap of 5cm to 10cm between the hood and the...

AI Technical Summary

Problems solved by technology

Based on the characteristics of the hot air hood of the cooling machine and the trolley moving and resting, there is a gap of 5cm to 10cm between the hood and the trolley. After the boiler induced draft fan of the waste heat power plant is turned on, a slight negative pressure is formed inside the hot air hood, which leads to A large amount of cold air outside the hot air hood is sucked into the hot air hood through this gap, which greatly reduces the taste of the waste heat flue gas and seriously affects the efficiency of the waste heat power station

At the same time, because the cooling machine can use the waste heat to gradually drop the temperature of each section from 500°C to about 200°C, the length-to-width ratio of the hot air hood in this section is too large, so that under the suction of the waste heat boiler induced fan, the flue gas in the entire hot air hood The flow field is in a state of turbulent flow and vortices are generated locally, and a large amount of high-temperature flue gas cannot enter the waste heat boiler through the hot air outlet and be recycled.

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