Flue gas desulfurization reactor for descending circulating fluidized bed

Abstract

The invention relates to a flue gas desulfurization technique for a descending circulating fluidized bed. The core equipment of the reactor is a reactor structure, which comprises a straight-flow streamline inlet flue, an absorbent distributor, a sound-wave soot blower, a static mixer, a reaction shell, a humidifying and activating nozzle, a tapered swirl-board gas-solid separator, a gas-solid separation guide cylinder, a desulphurized-gas outlet flue and a hyperbolic ash hopper. The reactor has a rational configuration which enables the smoke in the reactor to be fully collided and mixed with the absorbent so as to obtain a stable and even flow field, a temperature field and a pressure field. Besides, the reactor enables the absorbent to obtain with higher circulation ratio and use ratio. The invention is out of any problems such as sticking wall, scaling and bed collapsing; meanwhile, the reactor reduces the dust load of the exit flue gas obviously and also lowers the load of the bag-type dust remover at the back part greatly, thereby guaranteeing the safe, reliable and long-term operation and solving the technical problem in the semidry method flue gas desulfurization effectively.

Description

technical field [0001] The invention relates to flue gas desulfurization technology and equipment, in particular to a semi-dry flue gas desulfurization technology suitable for sintering machines in the iron and steel industry, coal-fired power plants and waste incineration power plants. Background technique [0002] Semi-dry flue gas desulfurization technology has low investment, less land occupation, no waste water discharge, no secondary pollution, high desulfurization efficiency, low operating cost, basically no corrosion in the system, and can be made of general carbon steel, which is in line with my country's national conditions, so Favored. At present, the semi-dry flue gas desulfurization technologies with relatively mature technology at home and abroad include: rotary spray drying method (SDA method), humidified ash circulation semi-dry method (NID method), suspended circulating fluidized bed method and dense phase dry tower method. But they all have their own weakne...

AI Technical Summary

Problems solved by technology

[0004] ① The rotary nozzle is expensive and the pulping system is complicated;

[0005] ② The flue gas flow rate in the absorption tower is very low, the tower diameter is large, and the floor area is large;

[0006] ③The Ca / S molar ratio is as high as 1.5, and higher quality lime is required, and the utilization rate of the absorbent is only about 50%;

[0007] ④ The slurry carries water and needs to be adjusted by adding water, which complicates the adjustment of the waterway caused by the temperature signal;

[0008] ⑤ The purified flue gas will corrode the rear dust removal equipment;

[0009] ⑥ During the operation of the device, the tower wall is easy to accumulate ash, and the bottom of the tower is easy to be blocked;

[0010] ⑦ Higher investment and higher operating costs (power consumption);

[0011] ⑧ Most of the by-products are CaSO 3 , is difficult to handle, and the use value is not high

The two move almost synchronously, with low chance of mutual friction and collision, and poor reaction effect;

[0014] ②The resistance drop of the reactor is relatively large, and the wear is serious (need to be made of wear-resistant steel);

[0016] ④ Absorbent (humidifying ash) has limited water addition (≤5%), low cycle rate (about 25), low utilization rate, and low desulfurization efficiency

[0018] ①The flow field is not uniform, even severe bias or partial eddy current;

[0019] ②The resistance drop of the reactor is relatively large (above 1500pa);

[0020] ③ Desulfurization ash sticks to the wall, agglomerates, collapses the bed, and tower blockage often occurs, making it difficult for the device to maintain long-term and stable operation

[0022] ① Lack of operating experience and low technical maturity;

[0024] ③The desulfurization efficiency is low

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