Biphase rectification flue gas desulfurization technique

Abstract

The invention discloses a dual-phase rectification flue gas desulfurization technology, which comprises a plurality of steps that (1) an absorption tower is arranged, (2) the flue gas is injected, (3) the limestone slurry is pumped in, and (4) the reaction product is collected. The dual-phase rectification flue gas desulfurization technology is characterized in that (1) the nonuniformity of flow field inside the spray tower is utilized, (2) the even rectification of liquidoid and gas phase is not processed on account of the design of rectifying plate and spray layer intentionally, (3) the resistance of flue gas is decreased and the velocity of flow of flue gas is uninfluenced, and (4) the liquidoid and the gas phase are kept turbulent state consistently because of the nonuniformity of liquidoid and gas phase. The dual-phase rectification flue gas desulfurization technology has the advantages of fierce collision, intense reaction, enough absorption, good performance of desulfurization, high efficiency, fast reaction rate, good performance of counter-current reaction, optimization of flow field, low system pressure drop, energy-saving, low device cost and maintenance cost, and direct maintenance and shift of inner parts without building temporary maintenance platform in the process of maintenance of absorption tower inner parts.

Description

technical field [0001] The invention belongs to the technical field of desulfurization, in particular to a two-phase rectification flue gas desulfurization process of a thermal power plant. Background technique [0002] With the rapid and continuous development of the economy, the serious pollution of the atmosphere by SO2 is becoming more and more obvious. Flue gas desulfurization (FGD) of coal-fired boilers is currently the only way to reduce SO2 emissions on a large scale. In this technology, limestone / gypsum wet flue gas desulfurization (WFGD) occupies a dominant position. In WFGD, there are currently two main technologies, one is liquid column technology and the other is spray tower technology. The two technologies are distinguished by different types of desulfurization towers. [0003] At present, the most widely used flue gas desulfurization tower in the world is the spray tower. This tower type has low investment cost and good desulfurization effect. Large, uneven ...

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Problems solved by technology

[0003] At present, the most widely used flue gas desulfurization tower in the world is the spray tower. This tower type has low investment cost and good desulfurization effect. Large, uneven flow field in the tower, etc., these problems will have a negative impact on the absorption of SO2

[0004] At present, most of the absorption towers are not equipped with a flue gas uniform device, the flue gas entering the absorption tower from the air inlet cannot be divided, and the flue gas cannot be well diffused in the absorption tower, resulting in the distribution of the flue gas in the absorption tower. Uneven, so that it cannot fully contact with the slurry sprayed from the nozzle, the effective contact area is reduced, and the desulfurization efficiency is affected

[0005] Chinese Patent Publication No. CN 200310102918.9 discloses a "flue gas desulfurization system with stepped trays". The system is equipped with multi-hole trays connected by Z-shaped brackets in the absorption tower cavity, step by step from the flue gas inlet end to the reverse end. The step-down step tray device has a better effect on the uniform distribution of smoke, but because of the step design, the flow rate of the smoke after passing through the step tray is greatly reduced, which brings great difficulties to the later defogging; Moreover, the stepped tray is easy to cause fouling and blockage of the absorption tower, thereby increasing the resistance of the system

[0006] Chinese Patent Publication No. CN 200520074267.1 discloses a "flue gas distribution device in the absorption tower". The system is equipped with more than three deflectors in the absorption tower. Distributed in the air inlet flow direction of the air inlet, the balance of the smoke flow velocity of the utility model is not affected, but due to the limitation of the number of deflectors, the uniform distribution effect of the smoke is not obvious

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