Zinc smelting waste heat boiler

Working principle

The waste heat from the zinc smelting system flows through the flue to the inlet of the zinc smelting waste heat boiler. The flue gas flows from bottom to top, passing through the superheater, two sets of evaporators, and economizer, and finally discharged into the chimney. The exhaust temperature is about 100-220 ℃. When the exhaust temperature drops from 380/330 ℃ to the exhaust temperature, the heat released is used to turn water into steam. The feedwater entering the waste heat boiler has a temperature of about 42-126 ℃. It first enters the upper economizer, where it absorbs heat and raises the water temperature. When the water temperature reaches a saturation temperature slightly below the pressure of the steam drum, it leaves the economizer and enters the steam drum. After the water entering the steam drum mixes with the saturated water inside, it enters two sets of evaporators along the downcomers below the steam drum. The water in the evaporators absorbs heat and begins to produce steam. Usually, only a part of the water becomes steam, so the steam water mixture flows inside the evaporator tubes. The steam water mixture leaves the evaporator and enters the upper part of the steam drum. There is a steam water separation device installed inside the steam drum, which can separate steam and water. The water falls into the water space inside the steam drum, while the steam comes out from the top of the steam drum to the superheater. Absorb heat inside the superheater to convert saturated steam into superheated steam.

Performance characteristics

1. The system is simple, easy to manage, and has fewer operators;

2. It does not increase the emissions of atmospheric pollutants, but effectively reduces the emissions of carbon dioxide and other pollutants;

3. No fuel consumption, economic benefits are not affected by fluctuations in fuel prices;

4. Fully consider utilizing waste heat steam to maximize the conversion and utilization of waste heat;

5. It not only saves energy, but also meets some of the electricity needs of the enterprise, reduces energy consumption, and improves the economic benefits of the enterprise, promoting energy conservation and emission reduction.

6. The convective heating surface adopts a parallel tube bundle membrane heating surface, and the flue gas flow velocity is set at a lower value, which is very beneficial for reducing wear, reducing and clearing dust accumulation.

7. For zinc smelting superheaters with high residual heat, effective measures should be taken to reduce ash accumulation, slagging, wear, corrosion, and clean ash residue.

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