In-furnace deep denitration process, denitration agent and preparation method of denitration agent

Abstract

The invention belongs to the technical field of denitration, and particularly relates to an in-furnace deep denitration process, a denitration agent and a preparation method of the denitration agent.The in-furnace deep denitration process comprises the following steps that a denitration agent is added into a heated hearth, so that the denitration agent is subjected to high-temperature cracking reaction to generate a gaseous denitration reducing agent; and the gaseous denitration reducing agent and nitrogen oxide in the hearth are subjected to in-situ reduction reaction so as to carry out deepdenitration. By utilizing the good diffusivity of the gaseous denitration reducing agent in a denitrification environment, the gaseous denitration reducing agent can be fully and efficiently mixed with gaseous nitric oxide, so that an in-situ reduction reaction is facilitated, and the effect of deep denitrification is achieved; and meanwhile, the concentration of nitric oxide in the hearth does not need to be limited, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of denitrification, and in particular relates to an in-furnace deep denitrification process, a denitrification agent and a preparation method of the denitrification agent. Background technique [0002] With the country's increasingly stringent requirements for environmental protection, there are higher and higher new standards for industrial flue gas, especially for the emission of nitrogen oxides. In the process of incineration, solid substances are burned into gaseous substances or other forms, which may cause greater harm to the environment. NO produced during waste incineration x Nitric oxide (NO) and nitrogen dioxide (NO 2 ), where NO is generated at higher temperatures, and NO 2 It is relatively stable at low temperature, and NO can combine with O in the air 2 or O 3 reaction to produce NO 2 . In the incinerator, the temperature and the chemical composition of the burning waste are the main fact...

AI Technical Summary

Problems solved by technology

At present, the existing flue gas denitrification treatment system in China, such as the ammonia water denitrification process, requires that the nitrogen oxides (NOx) in the denitrification furnace X ) concentration is less than 100 mg / standard square, resulting in low ammonia denitrification efficiency and heavy pollution, which cannot meet environmental protection requirements

Another example is the Selective Catalytic Reduction (SCR) technology. Although the denitrification efficiency is high, the process is complex, the equipment is expensive, the equipment operation and maintenance costs are high, and the service life is short. It is difficult to be widely used in the denitrification industry, especially in the domestic environmental protection industry. The use of thermal power plants has great limitations

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