The environment-friendly denitration technology of Harbin Boiler Corporation (HBC) mainly includes low nitrogen burner (LNB) technology, selective non catalytic reduction (SNCR) technology and selective catalytic reduction (SCR) technology. The LNB and SNCR technologies have lower denitration efficiency (<50%), thus being very difficult to meet the increasingly stringent requirements of environmental protection. While SCR’s denitration efficiency can reach more than 90%.Being introduced from Mitsubishi Electric Corporation, SCR technology is widely used in international and domestic thermal power plants.

1. HBC Patented Technology — rectification grid
· Sufficient height to ensure the rectification effect
· Special neck structure to make installation and maintenance convenient
2. Optimized design of supporting beam of catalyst
· Take multi-supporting and hanging structure of catalyst to ensure the smoothness of catalyst surface and prevent the catalyst extrusion deformation caused by the support beam deformation after long-term operation
3. Catalyst layout
· Catalyst is normally laid out in 2+1 layers, with two layers being preliminarily installed and 1 layer being reserved.
4. Catalyst flue gas sealing structure
· Use the lower seal structure to prevent the flue gas sneakage.
5. Ammonia injection grid
· Inject the ammonia in a combination of long and short tubes and reduce static header pressures to ensure a uniform ammonia ejection in the depth direction of the flue.

Electrostatic-fabric filter precipitator:
· It is the combination of electric precipitator and bag filter. The front electrostatic precipitation area features high-efficiency dust removal. It can collect most dust in the flue gas and reduce the density of the dust that will go into the back bag filter. The dust leftover goes into the filter bag to remove tiny dust particles. In general, it can reach more than 99.9% efficiency, with perfect performance.

Wet electrostatic precipitator (WESP) technology of Mitsubishi
(1) Corona discharge to cause ionization of gas molecules
(2) Dust particle charging
(3) Dust collected by collecting plate
(4) Using flushing water to remove dust

Features

Selection of appropriate electrode material according to engineering experiences
· The optimization of the nozzle structure and layout
· The optimization of inner flow field
· Simple ash water system is simple, and reduction of water consumption by sending wastewater into the desulfurization water system
· An installation way of fixing at the top and limiting the position at the bottom