Belt type roasting machine technology wind circulation system

Abstract

The invention discloses a belt type roasting machine technology wind circulation system. The system comprises a first fan and a second fan for leading to-be- desulfurized and denitrated smoke out, anair inlet of the second fan is communicated with a rear flue of a desulfurizer or the rear flue of a smoke dedusting condensation system, an air outlet of the second fan is communicated with a front flue of the first fan or the rear flue of the first fan; a temperature sensor for detecting smoke temperature is arranged in the front flue of the desulfurizer, and the system further comprises a controller respectively connected with the second fan and the temperature sensor, and when temperature of the smoke in the front flue of the desulfurizer is greater than first preset temperature, the controller controls the second fan to increase revolving speed. With the second fan, low-temperature smoke flowing out from the desulfurizer is lead into high-temperature smoke which is not in the desulfurizer, thus, temperature of the high-temperature smoke which is not in the desulfurizer is reduced, cooling effect of the smoke can be guaranteed without increase of oxygen content of the smoke of a belt type roasting machine, moreover, load of a follow-up smoke treatment system can be reduced, and production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of desulfurization and denitrification, and more specifically relates to a process air circulation system of a belt roaster. Background technique [0002] In the "Opinions on Promoting the Implementation of Ultra-Low Emissions in the Iron and Steel Industry" document issued by the state in 2019, it is stipulated that the benchmark oxygen content for the flue gas of the grate rotary kiln and the belt roaster to reach the target is 18%. [0003] The air system of the belt roaster is a relatively complex sealed circulation system. The flue gas drawn by the main induced draft fan has high content of particulate matter, sulfur dioxide and nitrogen oxides, and needs to be further purified before it can be discharged into the atmosphere. The air temperature is usually 100-180°C, and may exceed 200°C under extreme conditions. In order to ensure the normal operation of the process equipment during design, it is neces...

AI Technical Summary

Problems solved by technology

The oxygen content of desulfurization and denitrification flue gas after temperature adjustment increases by 0.6 to 1.5 percentage points, and the higher the flue temperature that needs to be reduced, the higher the oxygen content increases, resulting in the oxygen content of the flue gas exceeding the benchmark oxygen content stipulated by environmental protection, and also increasing Increased the load of subsequent flue gas dust removal, desulfurization and denitrification systems, and increased operation and equipment maintenance costs

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