广东快乐十分开奖结果Dalian Bihai Environmental Protection Equipment Co., Ltd. is specialized in research, development, design, manufacture, installation, commissioning, after-sales service and technical consultation for environmental protection and gas/fume scrubbing.

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Denitration introduction

The control method of the NOX starts from the three phases of the lifecycle of the fuel, i.e. before burning, during burning and after burning. For now, the research on denitration before burning is less that on the control of NOX during and after the burning. So internationally, all the control measurement of the NOX during the burning is generally called first treatment and after burning, second treatment, also called fuel gas denitration technology.

Generally, the control technology of NOX during the burning is low NOX burning technology, mainly including low NOX burner, air stage burning and fuel stage burning.

The mature fuel gas denitration technology applied on the coal-fired power plant is mainly as following:

 

1. Selective Catalytic Reduction, i.e. SCR

1) SCR Process principle

2) Reaction principle

The basic principle of SCR technology is to inject the ammonia (NH3) into the gas as reducing agent and revert the oxynitride (NOX) in the gas to nitrogen and water under the action of catalyzer. The efficiency of this technology is up to 90~95%. The emission concentration of Nox can be completely controlled under 100mg/Nm3.

The catalyzer during the reaction process is as below:

4NO + 4NH3 + O24N2 + 6H2O

6NO+ 8NH37N2 + 12H2O

 

2. Selective Non-Catalytic Reduction, i.e. SNCR

1) SNCR Process Principle


2) Reaction principle

The SNCR technology is to inject the reducing agent such as NH3 and carbamide etc. into the furnace to have the selective reaction. It`s found during the research that the NH3 or carbamide etc. amidogen reducing agent will selectively revert the NOx at the temperature range of 8501150in the furnace and without the catalyzer. The reducing agent (carbamide) is rapidly thermally decomposed into NH3 and has the SNCR reaction with the NOx in the gas to generate N2. This method uses the furnace as the reactor and almost not reacts with the O2 in the gas. In the range of 8501150, the main reduction reaction of NH3 or carbamide is as below:

NH3 as reducing agent:

4 NH3 + 4NO +O2 4N2 + 6H2O

Carbamide as reducing agent:

4NO2CONH22O24N22CO24H2O

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