I. Introduction to ammonia desulfurization

The ammonia desulfurization process is a mature desulfurization process that absorbs SO2 with ammonia water. Different ammonia processes differ only in the method of removing sulfur dioxide from the absorption solution. The ammonia process mainly includes ammonia flow downstream absorption method, empty tower spray absorption method, and ammonium sulfate column internal crystallization method.

Second, the principle of desulfurization

The process utilizes ammonia solution to absorb SO2 in the flue gas to form an ammonium sulfite solution, and oxidizes ammonium sulfite to ammonium sulfate under oxygen-rich conditions, and then crystallizes and precipitates ammonium sulfate by evaporation, and then filters and dried to obtain a fertilizer product. It mainly includes absorption process, oxidation process and crystallization process.

1) Absorption process

2NH3+H2O+SO2=(NH4)2SO3

(NH4)2SO3+H2O+SO2=2NH4HSO3

2) Oxidation process

NH4HSO4+NH3=(NH4)2SO4

2(NH4)2SO3+O2=2(NH4)2SO4

System composition: Sulfur ammonia desulfurization system includes six major systems, namely flue gas system, SO2 absorption system,

Absorbent system, ammonium sulfate post-treatment system, process water system, compressed air system.

Third, ammonia desulfurization technology features

1. Advanced reaction principle, making the equipment less occupied and simple in process:

2. The system is adapted to the sulfur content of coal from 1% to 3%:

3. Absorbent sources are abundant and easy to store;

4. Select ammonia water and ammonia water to make desulfurizer, which can reduce the freight rate to a minimum.

5. The equipment and system are internally divided by high temperature resistant special anticorrosive coating. The equipment is corrosion resistant, wear resistant, non-blocking, and durable for a long time.

6. The system equipment has low resistance, no need to replace the induced draft fan (the original induced draft fan needs to verify the wind pressure margin);

7. Desulfurization efficiency can reach over 95%