Iron and steel industry is an important part of our country's industry engineering and government is imposing more strict environmental request on it. Studies show that the total amount of Nox emitted by various equipments in steelworks occupies the second place in the fixed source. Among this, Nox emitted during sintering process accounts for about half of total Nox emitted by steelworks. Therefore, strict controls on Nox emission from sintering flue gas will effectively reduce the Nox emission from steelworks.
In denitrification system, as an important and effective heat transfer equipment, sintering flue gas heat exchanger (GGH) is able to effectively recover the waste heat, lift the flue gas temperature that enters into the denitrification reactor and improve the efficiency of denitrification catalyst.
The sintering flue gas has large flow and fluctuates greatly. The dust has high concentration and viscosity. Content of flue gas is complicated. Due to the rotation movement of the traditional rotary regenerative GGH, the leakage problem in principle is caused by the unreliability of axial and radial mechanical seals, and the leakage rate deteriorates seriously after operation. The adhesion of ammonium bisulfate to the surface of the whole heat exchanger element results in serious ash accumulation.
Considering this, Wintech developed the all welded plate type. Operation with zero leakage is ensured by adopting the all welded interwall heat transfer mechanism. The plate surface is smooth and the flue gas channel is straight. It is not easy to accumulate dust and precipitation and the resistance lost is less. Meanwhile the nozzle with high-pressure water or steam is designed and deployed on plate side to form an impact flow up to 1.0 Mpa to wash the ash clean.
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