Modular limestone wet-desulphurization reaction device and desulphurization process

Abstract

The invention discloses a modular limestone wet-desulphurization reaction device and a desulphurization process, belonging to the technical field of flue gas desulphurization. The device comprises a flue gas inlet channel, a desulphurization reaction module unit arranged between and connected with an inlet and an outlet, and a flue gas outlet channel, wherein the desulphurization reaction module unit is formed by vertically arranging a plurality of groups of independent reaction module channels layer by layer, and each group of reaction module channel is of a channel structure which is formedby connecting a plurality of reaction modules that are detachably connected in pairs in series and are communicating along the flowing direction of flue gas; vertical slurry spraying pipes are arranged at four corners of an inner cavity of any reaction module, the bottom of each reaction module communicates with a reaction slurry collecting pipe, and a plurality of slurry nozzles which are vertically arranged at intervals are arranged on each slurry spraying pipe; an inlet adjusting baffle is arranged at the inlet of the device; and an outlet adjusting baffle is arranged at the outlet of the device. According to the invention, one-time construction of a desulphurization system can basically meet the requirement on the whole operation life of a set, transformation investment is reduced, andthe purification requirement of high-sulfur flue gas can be met.

Description

Technical field[0001]The present invention relates to the field of flue gas desulfurization techniques, and more particularly to a modular stone gray stone humid desulfurization reaction device and a desulfurization process.Background technique[0002]At present, my country's thermal power unit fuel quality has gradually declined, and the chances of burning highululum power coal have gradually increased, and the requirements for environmental protection equipment are constantly increasing. The mainstream desulfurization equipment and related processes in the market have shown significant shortcomings in the case of investment.[0003]The existing flue gas desulfurization equipment, such as the FGD system occupies a market share of about 90%, and its flue gas main reaction vessel is a tower body, and the equipment covers a large area and the system is complicated. Since the FGD system technology has been developing earlier, there are many defects, such as: 1. During the actual operation,...

AI Technical Summary

Problems solved by technology

[0003] Existing flue gas desulfurization equipment, such as the FGD system, occupies about 90% of the market share. The main reaction vessel for the flue gas is the tower body, and the equipment occupies a large area and the system is complex.

Due to the early development of FGD system technology, there are many defects, such as: 1. In the actual operation process, affected by the uneven flow of flue gas inside the tower body, the actual desulfurization efficiency is usually lower than the design value by 5% to 8% %, when the sulfur content in raw flue gas exceeds 1000mg / Nm 3 It will have a huge impact on the emission standards of thermal power units

2. The existing desulfurization system is relatively complex. The operation of the wet desulfurization system requires multiple equipment to assist, which consumes a lot of power for the plant. Taking a domestic 600MW unit as an example, the oxidation fan equipment accounts for about 20% of the common power rate ~30%, higher energy consumption

3. During the operation of the equipment, since it is difficult to monitor the sulfur content of the flue gas at different heights in the tower body and at different positions of the same height cross-section one by one, the working condition of the large-area nozzle can only be adjusted by adjusting the overall slurry supply, and it is difficult to fine-tune adjustment, the consumption of limestone is relatively large

[0004] In response to the above problems, many researchers have proposed improvement schemes and optimization measures, such as: 1. Optimizing the flue gas flow path in the tower body, increasing the flue gas flow time, increasing the reaction time, and improving efficiency, but the improvement is limited

2. Increase the orifice plate in the tower body, so that the flue gas passes through the orifice plate during the upward flow process, reducing the unevenness of the flue gas flow rate, but causing a large pressure difference, increasing the power consumption of the induced draft fan, and in operation, it is very easy to If the orifice plate is blocked, it will have an adverse effect on the combustion stability of the boiler equipment if the blockage is serious

3. Adding catalytic reactant materials to the limestone slurry can improve flue gas desulfurization efficiency for a period of time, but long-term operation will greatly increase the operating cost, which is not conducive to large-scale promotion

[0005] Although there are certain improvements, there is a lack of a device composed of unitized modules that can flexibly respond to changes in sulfur content in flue gas

Images