System for comprehensive synergetic treatment on titanium dioxide rotary kiln calining tail gas and method of system

Abstract

The invention discloses a system for comprehensive synergetic treatment on a titanium dioxide rotary kiln calining tail gas and a method of the system. The system comprises a high-temperature bag-typedust collector, wherein a calcining tail gas pipeline is externally connected with the side wall of the high-temperature bag-type dust collector; the high-temperature bag-type dust collector is connected with a flue gas cooler through a pipeline; the flue gas cooler communicates with the top of a Venturi acid liquid concentrator; a pre-concentrator acid liquid storage tank is arranged at the bottom of the Venturi acid liquid concentrator; a primary flue gas desulfurization tower and a secondary flue gas desulfurization tower are sequentially connected with the side wall of the pre-concentrator acid liquid storage tank through pipelines; the secondary flue gas desulfurization tower is connected with a flue gas condenser, a demister and a flue gas reheater in parallel through pipelines; andthe flue gas reheater is connected with a low-temperature SCR (selective catalytic reduction) denitration reactor and a chimney through pipelines in sequence. By adopting the system, up-to-standard emission of pollutants such as acid mist, SO3, SO2, dust, NOx and dioxin in a titanium dioxide calining tail gas can be achieved.

Description

technical field [0001] The invention relates to the field of calcination tail gas treatment, in particular to a system and method for comprehensive and coordinated treatment of calcination tail gas of a titanium dioxide rotary kiln. Background technique [0002] Titanium dioxide is the most important white pigment widely used at present. It is widely used in coatings, papermaking, ink and other fields. Its demand is in direct proportion to GDP. At present, the annual production capacity of titanium dioxide in the world is more than 5 million tons, and the annual production capacity of titanium dioxide in China is more than 2 million tons. The price is about 15,000-22,000 yuan / ton. In terms of production methods, except for a small number of domestic production plants that use the chlorination method, most of the rest of the production plants use the sulfuric acid method for production. A prominent problem in the current sulfuric acid titanium dioxide production process is e...

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Problems solved by technology

[0019] The invention provides a system and method for comprehensive and coordinated treatment of titanium dioxide rotary kiln calcination tail gas. The system comprehensively solves the pollutants such as acid mist, sulfur dioxide, sulfur trioxide, NOx, dust, and dioxin in the titanium dioxide calcination tail gas. It can also solve important issues and problems such as wet plume emission

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