CN205948674U - Ultralow discharging equipment of coal fired boiler smoke pollutants - Google Patents

Abstract

An ultra-low emission device for coal-fired boiler flue gas pollutants, which relates to the improvement of coal-fired flue gas pollutant emission equipment. The high-efficiency desulfurization, fog and dust integrated device is sealed and connected, and a wet electrostatic precipitator is added at the outlet of the high-efficiency desulfurized, fog and dust integrated device. The flue passes through the wet electrostatic precipitator and the flue gas heat exchanger to seal the chimney. The beneficial effect is: local technical transformation of a single device, and the use of multiple devices to "coordinated removal" of multiple pollutants, so that the pollutants in the chimney discharge atmosphere can reach: dust ≤ 5mg/Nm ³ ; SO ₂ ≤ 35mg /Nm ³ ; NO _X ≤50mg/Nm ³ .

Description

Coal-fired boiler flue gas pollutant ultra-low emission device

technical field

The utility model belongs to the technical field of environmental protection equipment and relates to the improvement of coal-fired flue gas pollutant discharge equipment.

Background technique

At present, the exhaust gas generated in the process of burning coal needs to be treated with dust, SO2, NOX, etc. to meet the requirements of environmental protection. However, the existing pollutant treatment equipment is a single equipment to remove a single pollutant. It has met the requirements of GB13223-2011 "Emission Standard of Air Pollutants for Thermal Power Plants" currently implemented by the country. Dust removal equipment for dust removal is ≤30mg/Nm3, SO2 removal for desulfurization equipment is ≤100mg/Nm3, and NOX removal for denitrification equipment is ≤100mg/Nm3. Simultaneous dedusting, desulfurization, and denitrification will complicate the equipment, increase maintenance and operation costs, and sometimes discharge pollution treatment is not up to standard.

In view of my country's increasingly severe air pollution situation and the country's strict requirements for "ultra-low emissions" in key areas, the solid concentration discharged from the chimney is not greater than 10mg/Nm3.

Contents of the invention

The object of the present invention is to provide an ultra-low emission device for flue gas pollutants of coal-fired boilers, which comprehensively treats pollutants discharged from chimneys by means of collaborative removal, so that the pollutants discharged from chimneys in the atmosphere can reach: dust≤5mg /Nm ³ ; SO ₂ ≤35mg/Nm ³ ; NO _X ≤50mg/Nm ³ .

The technical scheme of the utility model is: the exhaust port of the boiler is airtightly connected with the bag filter through the denitrification SCR reactor, and the bag filter is airtightly connected with the integrated device of high-efficiency desulfurization, fog removal and dust removal. Wet electrostatic precipitator, the flue passes through the wet electrostatic precipitator, the flue gas heat exchanger is sealed and connected to the chimney.

The beneficial effects of the utility model are: carry out partial technological transformation on a single device, and use multiple devices to "coordinately remove" multiple pollutants, so that the pollutants in the chimney discharge atmosphere can reach: dust≤5mg/Nm ³ ; SO ₂ ≤35mg/Nm ³ ; NO _X ≤50mg/Nm ³ .

Description of drawings

Fig. 1 is a structural diagram of the overall system of "coordinated removal" of various pollutants by various equipment of the present utility model;

Fig. 2 is a structural diagram of an integrated device for high-efficiency desulfurization, mist removal and dust removal of the utility model;

Fig. 3 is an enlarged view of two layers of special-shaped demisting and dedusting S-curved blades of the present invention;

Fig. 4 is a top structural view of the airflow distribution plate of the present invention.

detailed description

The present invention will be further described below in conjunction with accompanying drawing:

As shown in Figure 1, 1 is a boiler, 2 is a denitrification SCR reactor, 3 is a HDF bag filter, 4 is an integrated device for high-efficiency desulfurization, mist removal and dust removal, 5 is a wet electrostatic precipitator, and 6 is GGH flue gas heat exchange Device, 7 are chimneys.

As shown in Figures 2, 3 and 4, 4-1 is the main body of the desulfurization tower, 4-2 is the spray nozzle for the internal circulating fluid, 4-3 is the special-shaped S-curved blade for fog and dust removal, and 4-4 is the thorn-shaped convex object , 4-5 is an air distribution ring, 4-6 is an air distribution plate, 4-7 is a through hole, and 4-8 is an air inlet.

1. Dust removal

① Carry out technical transformation on the bag filter and develop the HDF bag filter to make the dust emission concentration ≤ 20mg/Nm ³ ;

② Carry out technical transformation on the desulfurization tower, and develop an integrated device for desulfurization, mist removal and dust removal, so that the dust emission concentration is ≤10mg/Nm ³ ;

③ Increase the wet electrostatic precipitator to make the dust emission concentration ≤ 5mg/Nm ³ ;

2. Desulfurization

① Carry out technical transformation on the desulfurization tower, and develop an integrated device for desulfurization, mist removal and dust removal, so that the SO ₂ emission concentration is ≤50mg/Nm ³ ;

②Add wet electrostatic precipitator to make SO ₂ emission concentration ≤35mg/Nm ³ ;

3. Denitrification

①Add SCR reactor to make NO _x emission concentration ≤80mg/Nm ³ ;

② Carry out technical transformation on the desulfurization tower, and develop an integrated device for desulfurization, mist removal and dust removal, so that the NO _x emission concentration is ≤65mg/Nm ³ ;

③Add wet electrostatic precipitator to make NO _x emission concentration ≤50mg/Nm ³ .

The structure of the high-efficiency desulfurization, mist and dust removal integrated device is:

An airflow distribution plate 4-6 is installed and fixed on the horizontal section above the air intake passage in the desulfurization tower body 4-1, and through holes 4-7 are distributed on the airflow distribution plate 4-6.

An annular air flow distribution ring 4-5 is installed and fixed at the blowing place of the water flow ejected from the nozzle 4-2 in the desulfurization tower body 4-1.

Two layers of special-shaped fog and dust removal S-curved blades 4-3 are installed on the upper part of the desulfurization tower body 4-5, and thorn-shaped convex objects 4-4 are fixed on the inner plate surface of the special-shaped fog and dust removal S-curved blades.

Claims (1)

1. a kind of fire coal boiler fume pollutant minimum discharge device, is characterized in that：Boiler smoke outlet passes through denitration SCR reactor With sack cleaner seal joining, sack cleaner and high-efficiency desulfurization demisting dust removal integrated plant seal joining, efficiently taking off The outlet of sulfur demisting dust removal integrated plant increases wet cottrell, and flue is through wet cottrell, flue gas heat-exchange unit Seal joining chimney.