System and method for desulphurization and denitration

Abstract

The invention discloses a system for desulphurization and denitration. The system comprises a tower body. A lower part of the tower body is provided with a flue gas inlet. The interior of the tower body corresponding to a position below the flue gas inlet is provided with an oxidization section. The interior of the tower body corresponding to a position above the flue gas inlet is orderly provided with a concentration section, an absorption section, a purification washing section and a demisting section from bottom to top. The invention also discloses a method for desulphurization and denitration by the system. The system for desulphurization and denitration has an ingenious and reasonable design, effectively solves the problem of a high operation cost, has stable processes, realizes absorption and concentration crystallization combination, does not produce waste liquid, limits ammonia escape and discharge and thoroughly solves the problems of ammonia escape and aerosol. The method for desulphurization and denitration has simple processes, realizes desulphurization and denitration, has high desulphurization and denitration efficiency, saves energy, is environmentally friendly, has a low cost, can be operated safely and stably, changes wastes into valuables, and indicates a key direction for environmentally-friendly desulphurization development.

Description

technical field [0001] The invention belongs to the technical field of desulfurization and denitration, and in particular relates to a desulfurization and denitration system and a desulfurization and denitration method thereof. Background technique [0002] The integrated technology of desulfurization and denitrification widely used at home and abroad today is mainly the combination of wet flue gas desulfurization and selective catalytic reduction or selective non-catalytic reduction technology. Wet flue gas desulfurization is commonly used calcium method using lime or limestone, and the desulfurization efficiency can reach 90%. The disadvantage is that the project is huge, the initial investment and operation costs are high, and it is easy to form secondary pollution. When the selective catalytic reduction denitrification reaction temperature is 250-450°C, the denitrification rate can reach 70%-90%. This technology is mature and reliable, and is currently widely used in th...

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Problems solved by technology

[0004] The purpose of the present invention is also to provide a desulfurization and denitrification method for the above-mentioned desulfurization and denitrification system. The process steps of the method are simple, not only achieve the effect of desulfurization and denitrification, but also solve the problem of ammonia escape, and have high efficiency, energy saving and environmental protection, and low cost. Low

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