CN201327042Y

CN201327042Y - Device for removing nitrogen oxide and dioxin in waste gas of low ash zone of burning facility

Info

Publication number: CN201327042Y
Application number: CNU2008201693445U
Authority: CN
Inventors: 樊孝玉; 杨杭生; 陈银康; 张孝彬
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-12-02
Filing date: 2008-12-02
Publication date: 2009-10-14
Anticipated expiration: 2018-12-02

Abstract

The utility model discloses a device for removing nitrogen oxide and dioxin in waste gas of low ash zone of burning facility, which comprises a waste gas inlet section, one or a plurality of selective catalytic reaction sections and a gas outlet section, wherein a plurality of catalysis heating units which are in parallel with an axial cord are installed in the selective catalytic reaction sections, each catalysis heating unit is composed of two accelerant plates and a heating component which is clamped between the two accelerant plates, and a gap is arranged between neighboring catalysis heating units to form a waste gas channel. The device of the utility model is installed on a low ash zone behind a dust removing and acid removing device of the burning facility, the waste gas enters the selective catalytic reaction sections through the waste gas inlet section, and the nitrogen oxide and the dioxin generate catalytic reactions on the surface of the heated accelerant plates on the selective catalytic reaction sections to achieve the purpose of removing nitrogen oxide and dioxin. The device can be applied in eliminating and reducing pollutants such as nitrogen oxide and dioxin in waste gas which is generated in the high temperature processes such as waste burning, fire coal power plants, metal smelting and the like.

Description

Remove the equipment of low gray area nitrogen oxides of exhaust gas of burning facility and dioxin

Technical field

The utility model relates to a kind of equipment of removing low gray area nitrogen oxides of exhaust gas of burning facility and dioxin.

Background technology

Some factories such as garbage burning factory, metallurgical works, coal-fired power plant etc. in the high temperature incineration process, can produce two kinds of main noxious material nitrogen oxide (NO _X) and dioxin (Dioxins also claims PCDD/DFs).The former can cause multiple environmental problem to comprise photochemical fog, acid rain etc.; The latter is persistent organic pollution, comprises polychlorinated dibenzo-2 evil English class (PCDDs) and polychlorinated dibenzo (PCDFs), and these materials produce huge injury by food chain enrichment in human body to human body.Countries in the world are one after another by the rules and the in addition strict control that takes appropriate measures.

In order to reduce the discharging of nitrogen oxide, selectivity catalytic reaction technology (Selective Catalytic Reaction is called for short SCR) be use in the world at present technology the most widely, also be the catalytic denitration technology.The SCR ratio juris is: with NH ₃(or urea) injects exhaust pipe, mixes the back and utilizes the reduction of catalyst to make NO, NO on catalytic bed ₂With NH ₃At 200-450 ℃ the reduction reaction taking place down, generates harmless N ₂And H ₂O, main reduction reaction formula is:

4NO+4NH ₃+O ₂→4N ₂+6H ₂O

6NO ₂+8NH ₃→7N ₂+12H ₂O

The equipment of existing removal burning facility nitrogen oxides of exhaust gas and dioxin comprises the exhaust gas inlet section, one or more selectivity catalyst reaction section and gas outlet section.In order to reduce the discharging of dioxin in the waste gas, main employing is that active carbon adsorption is handled in early days.But it is solid-state that this method just is converted to the dioxin absorption of gaseous state, and can't decompose dioxin, active carbon to be discarded imbed underground after, the potential threat that is entered human body by plant absorbing through food chain is still arranged.New effective treating method is to adopt the appropriate catalyst system under suitable temperature (more than 250 ℃) its catalytic decomposition to be become CO ₂And H ₂The composition that O etc. are innoxious.

The a large amount of research-on-research of process and is discovered: adopt selectivity catalytic reaction technology, with Detitanium-ore-type TiO ₂Deng being load, with VO _XDeng catalyst nitrogen oxide and two kinds of toxic gases of dioxin all there is good catalytic effect for activity.For example, adopt WO _X-VO _X-TiO ₂And MoO _X-VO _X-TiO ₂Etc. system, can both effectively realize NO _XReduction of discharging with PCDD/DFs.

The selectivity catalytic reaction system mainly can use in high gray area and low gray area respectively according to its position difference of installing.The selectivity catalytic reaction system that uses is installed in high gray area mostly at present, because the sour gas such as sulfur dioxide in the waste gas cause the poisoning of catalyst and inactivation, and a large amount of flying dusts washes away performance and the service life that has a strong impact on catalyst the high speed of catalyst.For the selectivity catalytic reaction system that uses in low gray area, behind cleaner (generally adopting pocket type control of dust or electrostatic precipitator) and deacidification equipment (half dry type or wet type are removed acid tower), the temperature of waste gas is about 150 ℃, and it is temperature required to satisfy catalytic reaction.Therefore usually adopt the mode that waste gas is heated again to improve EGT, the not only construction of facility and operating cost costliness, and also energy loss is serious.

Summary of the invention

The purpose of this utility model is the low gray area nitrogen oxides of exhaust gas of removal burning facility in design a kind of low energy consumption, low cost, prolongation catalyst service life and the equipment of dioxin.

The equipment of low gray area nitrogen oxides of exhaust gas of removal burning facility of the present utility model and dioxin, comprise the exhaust gas inlet section, one or more selectivity catalyst reaction section and gas outlet section, a plurality of catalysis heating units that parallel to the axis are installed in the selectivity catalyst reaction section, each catalysis heating unit is made up of two catalyst plates heater block middle with being clipped in two catalyst plates, have the gap between adjacent catalysis heating unit, form exhaust steam passage.

In the utility model, said heater block can be heating resistor plate or resistance wire, also can be the gas heating tube, and the used thermal source of gas heating tube is hot gas or high-temperature vapor.

In the utility model, said catalyst plates can be the denitrating catalyst plate, or removes the catalyst plates of dioxin, or the mixed catalyst plate of denitration and removal dioxin.

In the utility model, when adopting a plurality of selectivity catalyst reaction section, adjacent two axial half-twists of selectivity catalyst reaction section.

During use, equipment of the present utility model is installed in the burning facility dedusting and the low gray area of the equipment that deacidifies, waste gas enters the selectivity catalyst reaction section through the exhaust gas inlet section.In the selectivity catalyst reaction section, catalytic reaction takes place on the catalyst plates surface of heating in nitrogen oxide or dioxin, reaches the purpose of removing nitrogen oxide and dioxin.

The beneficial effects of the utility model are:

The equipment of low gray area nitrogen oxides of exhaust gas of removal burning facility of the present utility model and dioxin, in the selectivity catalyst reaction section catalysis heating unit has been installed, by mode to the catalyst plates heating, reach the required temperature conditions of catalytic reaction, replace traditional passing through the mode of large quantity of exhaust gas preheating has been reached the required temperature conditions of catalytic reaction, greatly reduced energy consumption cost.Equipment of the present utility model is installed in after burning facility dedusting and the deacidification equipment, can effectively prevent the etching of high speed dust to catalyst, prevents dust and SO ₂The poisoning effect of the catalyst plates that causes Deng sour gas, thus the service life of catalyst plates prolonged, reach the effect that reduces operating cost and energy consumption.The utility model can be used for ultra-large metallurgical works, coal-fired power plant, also can be used for the waste gas cleaning system of small-sized house refuse and medical wastes incineration facility.Meet and build resource-conserving and environment friendly social requirement.

Description of drawings

Fig. 1 is the formation schematic diagram of the utility model equipment;

Fig. 2 is a kind of catalysis heating unit schematic diagram;

Fig. 3 is another kind of catalysis heating unit schematic diagram.

The specific embodiment

Further specify the utility model below in conjunction with accompanying drawing.

With reference to Fig. 1, the equipment of low gray area nitrogen oxides of exhaust gas of removal burning facility of the present utility model and dioxin, comprise exhaust gas inlet section 1, one or more selectivity catalyst reaction section 2 and gas outlet section 3, a plurality of catalysis heating units 4 that parallel to the axis are installed in selectivity catalyst reaction section 2, have the gap between adjacent catalysis heating unit, form exhaust steam passage 7.In the legend, have two selectivity catalyst reaction section, these two axial half-twists of selectivity catalyst reaction section,

Fig. 2, Fig. 3 are respectively the formation example of catalysis heating unit, and catalysis heating unit 4 is made up of two catalyst plates 5 heater block 6 middle with being clipped in two catalyst plates.Heater block 6 is the heating resistor plate among Fig. 2, and heater block 6 is the gas heating tube among Fig. 3, and gases used can be high-temp waste gas, or high-temperature water vapor.

During use, through the waste gas after dedusting and the depickling processing, enter the selectivity catalyst reaction section through the exhaust gas inlet section, in the selectivity catalyst reaction section, catalytic reaction takes place in nitrogen oxide or the dioxin catalyst plates surface after heating, reaches the purpose of removing nitrogen oxides from exhaust gas and dioxin.

Claims

1. remove the equipment of low gray area nitrogen oxides of exhaust gas of burning facility and dioxin, comprise exhaust gas inlet section (1), one or more selectivity catalyst reaction section (2) and gas outlet section (3), it is characterized in that in selectivity catalyst reaction section (2), being equipped with a plurality of catalysis heating units (4) that parallel to the axis, each catalysis heating unit is made up of two catalyst plates (5) and the heater block (6) that is clipped in the middle of two catalyst plates, have the gap between adjacent catalysis heating unit, form exhaust steam passage (7).

2. the equipment of low gray area nitrogen oxides of exhaust gas of removal burning facility according to claim 1 and dioxin is characterized in that heater block (6) is heating resistor plate or resistance wire, perhaps is the gas heating tube.

3. the equipment of low gray area nitrogen oxides of exhaust gas of removal burning facility according to claim 1 and dioxin, it is characterized in that said catalyst plates is the denitrating catalyst plate, or the catalyst plates of removal dioxin, or the mixed catalyst plate of denitration and removal dioxin.

4. removal burning facility according to claim 1 hangs down the equipment of gray area nitrogen oxides of exhaust gas and dioxin, it is characterized in that adjacent two axial half-twists of selectivity catalyst reaction section of a plurality of selectivity catalyst reaction section (2).