CN206786703U - A kind of depth presses down nitrogen recycle stream fluidized bed boiler - Google Patents
A kind of depth presses down nitrogen recycle stream fluidized bed boiler Download PDFInfo
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- CN206786703U CN206786703U CN201720502996.5U CN201720502996U CN206786703U CN 206786703 U CN206786703 U CN 206786703U CN 201720502996 U CN201720502996 U CN 201720502996U CN 206786703 U CN206786703 U CN 206786703U
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- fluidized bed
- recycle stream
- bed boiler
- nitrogen recycle
- stream fluidized
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Abstract
A kind of depth suppression nitrogen recycle stream fluidized bed boiler is the utility model is related to, is specifically included：More gradient fractionation blowing systems, high-efficiency turbine cyclone separation system, without ammonia catalyst coat system, Secondary Air proportioning can flexibly be adjusted, strengthen Matter Transfer in Boiler Furnace, reconstruct stove internal oxidition reduced zone is simultaneously installed efficiently without ammonia catalyst coat in reducing zone equipotential, finally realizes nitrogen oxides minimum discharge and higher efficiency of combustion；The utility model may be such that boiler operatiopn environmental protection characteristic significantly increases without newly-increased denitration device and denitrification reducing agent addition, reach minimum discharge requirement, have the advantages that cost of investment is small, and the transformation cycle is short, no operating cost, and boiler operatiopn is stable.
Description
Technical field
The utility model belongs to environmental technology field, is related to CFBB, and more particularly to a kind of depth suppression nitrogen follows
Circulation fluidized bed boiler.
Background technology
China's energy resource structure is based on coal, thus coal fired power generation also occupies main status in power industry.But coal
Charcoal burning will produce many pollutants, such as sulfur dioxide, nitrogen oxides and flue dust, and wherein nitrogen oxides is the master that acid rain is formed
Want one of source.With the fast development of China's economy, pollutant emission is more serious, is brought to people's lives greatly tired
Disturb.Therefore, to reduce pollution of the coal fired power generation to air, country proposes higher and higher standard limit of smog release, especially certainly
Coal-burning power plant's minimum discharge transformation action, existing large-sized station boiler discharged nitrous oxides limit have progressively been come into effect since 2015
It is worth for 50mg/m3。
Although domestic existing characteristic of the Properties of CFB with low-nitrogen oxide discharging, faces minimum discharge mark
Standard, all in-service units are both needed to carry out minimum discharge transformation.Traditional denitration renovation technique route includes SNCR denitration technology, SCR
Denitration technology etc., no matter which kind of technology path must install denitration device additional and be sprayed into greatly into flue gas in boiler running process
Measure denitrification reducing agent, such as urea, ammoniacal liquor.Investment for trnasforming urban land is huge and later stage operation and maintenance cost is very high, in addition, can also there is ammonia
Escape phenomenon causes back-end surfaces, deduster burn into block and form new pollution sources into air.
The content of the invention
The shortcomings that in order to overcome above-mentioned prior art, the purpose of this utility model are to provide a kind of depth suppression nitrogen recycle stream
Fluidized bed boiler, the environmental protection characteristic of CFB boiler is given full play to, nitrogen oxides raw emissions are reduced, so as to which nitrogen oxides be greatly reduced
Removing cost.
To achieve these goals, the technical solution adopted in the utility model is：
A kind of depth presses down nitrogen recycle stream fluidized bed boiler, including more gradient fractionation blowing systems (MLAS) separate with high-efficiency turbine
System (HPTSS), wherein：
More gradient fractionation blowing systems include First air (PA) and Secondary Air (SA), and First air is by pressing air compartment 1
And bell-type windshield 2 is evenly distributed in whole burner hearth emulsion zone 3, Secondary Air classification from overfiren air port 4 be sent into burner hearth emulsion zone 3 and
Burner hearth central region；
The high-efficiency turbine piece-rate system includes the horizontal flue 8 with flue gas flow guiding dummy club 9, and horizontal flue 8 connects whirlpool
Central tube 12 is taken turns, guide vane is installed inside turbine central tube 12 and strengthens gas solid separation, the bottom of turbine central tube 12, which is set, to be divided
From device 11, the material separated is sent into material returning device 13.
This hair utility model can also further comprise no ammonia catalyst coatings system NACCS, be arranged in more gradient fractionation air distributions
System and high-efficiency turbine piece-rate system so that NO and CO boiler per se with catalyst catalytic action under that reduction occurs is anti-
Should, realize denitrating flue gas.
The bell-type windshield 2 includes outlet straight tube upward, and is arranged in the cap body of outlet top, and air distribution is from straight tube
After top exit outflow, turn back under the stop of cap body and flowed along the gap between cap body inwall and straight tube outer wall below cap body again
Go out, 80~350mm of spacing between the bell-type windshield 2.
The overfiren air port 4 arranges 1~4 layer along different height, and primary air flow accounts for the 20 of the total wind TA amounts of burning during operation
~50%, secondary air flow accounts for the 50~80% of burning total blast volume.
The turbine central tube 12 uses spiral streamlined structure, the blade rotation direction and flow rotation direction phase of turbine in cylinder
Different, cylinder is integrally cast using heat-resistance stainless steel.
The thickness of flue gas flow guiding dummy club 9 is adjustable, adjustable range 20mm~1500mm.
The castable surface of burner hearth emulsion zone 3, the heat-transfer surface surface of bottom water-cooling wall 5 of burner hearth and burner hearth screen formula are heated
The surface of face 7 is arranged with no ammonia catalyst coatings.
The bell-type windshield 2, flue gas flow guiding dummy club 9, the cylinder inboard wall of turbine central tube 12 and blade surface are respectively provided with
Whether there is ammonia catalyst coatings.
The no ammonia catalyst coatings thickness range 0.5mm~20mm.
When the no ammonia catalyst coatings are used in castable or moldable region, be attached to its surface, or with castable or can
Plastics are mixed to form wear-resisting Catalytic Layer.
Compared with prior art, the beneficial effects of the utility model are：
1.CFB boilers can significantly reduce NO after using this technologyxConcentration of emission, without using any auxiliary denitration technology,
Fume emission disclosure satisfy that the newest minimum discharge limit value of country, obvious environment benefit.
2. due to denitrification reducing agent need not be consumed in running, power plant's environmental protection operating cost can be greatly reduced.
3. without newly-increased energy consumption equipment, and to subsidiary engine power consumption without obvious negative effect.
4. it can be had a certain upgrade for boiler combustion efficiency due to Matter Transfer optimization in stove after implementing.
5. avoiding the generation of denitration accessory substance, facilitation is suffered from for environmental protection and unit operation security.
It is demonstrated experimentally that when existing unit is only with more gradient fractionation blowing systems (MLAS) and high-efficiency turbine piece-rate system
(HPTSS) when, you can NO generation is greatly reduced, and after adding without ammonia catalyst coatings system, NO in boiler emission flue gasxConcentration
Can be reduced to before transformation more than 50%~80%, raw emissions are down within minimum discharge limitation.
Brief description of the drawings
Fig. 1 is that the utility model CFBB depth presses down nitrogen minimum discharge transformation overall structure diagram.
Fig. 2 is the more gradient fractionation blowing system MLAS schematic diagrames of the utility model CFBB.
Fig. 3 is the utility model high efficiency for circulating fluidized bed boiler piece-rate system HPTSS schematic diagrames.
Embodiment
Describe embodiment of the present utility model in detail with reference to the accompanying drawings and examples.
As shown in figure 1, the utility model, which is a kind of depth, presses down nitrogen recycle stream fluidized bed boiler, including more gradient fractionation air distribution systems
Unite (MLAS), high-efficiency turbine piece-rate system (HPTSS) and without ammonia catalyst coatings system (NACCS).
More gradient fractionation blowing systems are as shown in Fig. 2 including First air (PA) and Secondary Air (SA), and First air is by pressing
Air compartment 1 and bell-type windshield 2 evenly distribute is sent into the close phase of burner hearth in whole burner hearth emulsion zone 3, Secondary Air classification from overfiren air port 4
Area 3 and burner hearth central region.Overfiren air port 4 arranges 1~4 layer along different height, and primary air flow accounts for the total wind TA of burning during operation
The 20~50% of amount, secondary air flow account for the 50~80% of burning total blast volume.Wherein, bell-type windshield 2 includes outlet upward straight
Pipe, and the cap body of outlet top is arranged in, air distribution is turned back along cap again after the outflow of straight tube top exit under the stop of cap body
The gap between wall and straight tube outer wall is flowed out below cap body in vivo, 80~350mm of spacing between bell-type windshield 2,
Blast cap material is high temperature heat-resisting.
High-efficiency turbine piece-rate system is as shown in figure 3, convex including the horizontal flue 8 with flue gas flow guiding dummy club 9, flue gas water conservancy diversion
The thickness of platform 9 is adjustable, adjustable range 20mm~1500mm, and material uses corrosive-proof plastic material or castable.Horizontal flue 8 connects burner hearth
With turbine central tube 12, guide vane is installed inside turbine central tube 12 and strengthens gas solid separation, the bottom of turbine central tube 12 is set
Separator 11 is put, the material separated is sent into material returning device 13.Top connects tail vertical well 13, in tail vertical well 13 from top to bottom
Arrange superheater 14, economizer 15 and air preheater 16.Turbine central tube 12 uses spiral streamlined structure, the blade of turbine in cylinder
Rotation direction and flow rotation direction are different, and cylinder is integrally cast using heat-resistance stainless steel.
Without ammonia catalyst coatings system, be arranged in more gradient fractionation blowing systems and high-efficiency turbine piece-rate system so that NO and
CO boiler per se with the catalytic action of catalyst issue raw reduction reaction, realize denitrating flue gas.Specifically, in bell-jar
Blast cap 2, flue gas flow guiding dummy club 9, the castable surface of burner hearth emulsion zone 3, the heat-transfer surface surface of bottom water-cooling wall 5 of burner hearth, burner hearth screen
The surface of formula heating surface 7, the cylinder inboard wall and blade surface of turbine central tube 12, no ammonia catalysis can be adhered in whole or in part and applied
Layer.
In the utility model, no ammonia catalyst coatings be with binary or multi-element metal without ammonia catalytic performance, such as iron,
Copper, nickel, manganese, cobalt, titanium, aluminium, chromium or rare earth metal；Or metal oxide, or the mixture coating of metal and metal oxide, it is thick
Spend scope 0.5mm~20mm.During used in castable or moldable region, by the way of its surface is attached to, or and castable
Or moldable it is mixed to form wear-resisting Catalytic Layer.
According to above basic structure, it is as follows that the utility model provides embodiment：
Embodiment 1
It is related to 1 480t/h CFBB, boiler uses dry ash free basis Vdaf8% anthracite, boiler one
Secondary wind is sent into burner hearth by bell-type windshield 2 with 48% total blast volume and ensures the normal fluidisation of boiler bed and the preliminary combustion of as-fired coal
To burn, 50% point of two-stage that Secondary Air accounts for total wind TA amounts is sent into burner hearth emulsion zone 3, and lower overfiren air port is highly 1 meter apart from air distribution plate,
Upper overfiren air port is apart from lower 5 meters of overfiren air port, the surface of bell-type windshield 2, emulsion zone castable surface, water-cooling screen and overheat in stove
Water cooling wall surface more than screen and emulsion zone in 10 meters of height adheres to efficiently without ammonia catalyst coatings, furnace outlet horizontal flue
Outlet is controlled velocity of flue gas in 28m/s by installing flue gas flow guiding dummy club 9 additional, and central tube is replaced by turbine central tube 12, flue gas
Flow guiding dummy club 9, the inwall of flue gas flow guiding dummy club 9 and impeller attachment are efficiently without ammonia catalyst coatings.
Due to air stage feeding so that boiler emulsion zone 3 is reducing atmosphere, so as to inhibit NO generation, simultaneously because coal
, there is the CO of high concentration in the region in imperfect combustion, CO is applied by the catalysis on bell-type windshield 2 and emulsion zone pouring material surface
Layer reduce further the concentration of nitrogen oxides with NO reactions, and with the rising of flue gas, Secondary Air is sent from different height blower fan
Enter burner hearth so that so that coal-burning particle further burns, because Secondary Air penetration power is limited, burner hearth center has anoxic zones, thus
The region remains as reducing atmosphere, thus NO further can be reduced to N by the catalyst coat on pendant superheater surface2.It is high
The presence of effect piece-rate system can greatly improve boiler solid circulating rate, and efficient hardening heat transfer controls combustion temperature in hearth to press down
The generation of thermal NO is made, and the catalyst coatings on the surface of turbine central tube 12 are as by the CO participated in flue gas and stove
The NO that thorax outlet ultimately generates does further catalytic reaction, finally to realize the purpose of depth suppression nitrogen, a variety of hands more than
The synergy of section, the NOx emission concentration during boiler operatiopn is 38mg/m3。
Embodiment 2
It is related to 1 1024t/h CFBB, boiler uses dry ash free basis Vdaf 25% bituminous coal, boiler one
Secondary wind is sent into burner hearth by bell-type windshield 2 with 40% total blast volume and ensures the normal fluidisation of boiler bed and the preliminary combustion of as-fired coal
Burn, 58% point of three-level that Secondary Air accounts for total wind TA amounts is sent into burner hearth emulsion zone 3, and lower overfiren air port is highly 1.5 apart from air distribution plate
Rice, middle overfiren air port 6 meters of overfiren air port in lower 5.5 meters of overfiren air port, upper overfiren air port distance.The surface of bell-type windshield 2,
Water-cooling screen in emulsion zone castable surface, stove, cross the more than heat shielding and again heat shielding and emulsion zone water-cooling wall table in 15 meters of height
Face is adhered to efficiently to be exported by installing flue gas flow guiding dummy club 9 additional by velocity of flue gas without ammonia catalyst coatings, furnace outlet horizontal flue
In 30m/s, central tube is replaced by turbine central tube 12, flue gas flow guiding dummy club 9, the inwall of turbine central tube 12 and impeller attachment for control
Efficiently without ammonia catalyst coatings.
Due to air stage feeding so that boiler emulsion zone 3 is reducing atmosphere, so as to inhibit NO generation, simultaneously because coal
, there is the CO of high concentration in the region in imperfect combustion, CO is applied by the catalysis on bell-type windshield 2 and emulsion zone pouring material surface
Layer reduce further the concentration of nitrogen oxides with NO reactions, and with the rising of flue gas, Secondary Air is sent from different height blower fan
Enter burner hearth so that so that coal-burning particle further burns, because Secondary Air penetration power is limited, burner hearth center has anoxic zones, thus
The region remains as reducing atmosphere, thus NO further can be reduced to N by the catalyst coat on pendant superheater surface2.It is high
The presence of effect piece-rate system can greatly improve boiler solid circulating rate, and efficient hardening heat transfer controls combustion temperature in hearth to press down
The generation of thermal NO is made, and the catalyst coatings on the surface of turbine central tube 12 are as by the CO participated in flue gas and stove
The NO that thorax outlet ultimately generates does further catalytic reaction, finally to realize the purpose of depth suppression nitrogen, a variety of hands more than
The synergy of section, the NOx emission concentration during boiler operatiopn is 42mg/m3。
The description of above example is more specific, but therefore can not be interpreted as the limitation to this patent scope, for
For one of ordinary skill in the art, without departing from the concept of the premise utility, the several modifications and improvements made,
These belong to the scope of protection of the utility model.
Claims (10)
1. a kind of depth presses down nitrogen recycle stream fluidized bed boiler, it is characterised in that including more gradient fractionation blowing systems (MLAS) and height
Turbine piece-rate system (HPTSS) is imitated, wherein：
More gradient fractionation blowing systems include First air (PA) and Secondary Air (SA), First air by press air compartment (1) and
Bell-type windshield (2) evenly distributes is sent into the close phase of burner hearth in whole burner hearth emulsion zone (3), Secondary Air classification from overfiren air port (4)
Area (3) and burner hearth central region；
The high-efficiency turbine piece-rate system includes the horizontal flue (8) with flue gas flow guiding dummy club (9), horizontal flue (8) connection
Turbine central tube (12), guide vane is installed inside turbine central tube (12) and strengthens gas solid separation, under turbine central tube (12)
Portion sets separator (11), and the material separated is sent into material returning device (13).
2. depth suppression nitrogen recycle stream fluidized bed boiler according to claim 1, it is characterised in that also include：Without ammonia catalyst coatings
System (NACCS), it is arranged in more gradient fractionation blowing systems and high-efficiency turbine piece-rate system so that NO and CO is in boiler band in itself
The catalytic action of some catalyst issues raw reduction reaction, realizes denitrating flue gas.
3. depth suppression nitrogen recycle stream fluidized bed boiler according to claim 1, it is characterised in that bell-type windshield (2) bag
The straight tube of mouth upward is included, and is arranged in the cap body of outlet top, air distribution is after the outflow of straight tube top exit, in the resistance of cap body
Lower turn back again below along the gap between cap body inwall and straight tube outer wall from cap body of gear is flowed out, and the bell-type windshield (2) is each other
Between 80~350mm of spacing.
4. depth suppression nitrogen recycle stream fluidized bed boiler according to claim 1, it is characterised in that the overfiren air port (4) is not along
With 1~4 layer of height placement, primary air flow accounts for the 20~50% of total wind (TA) amount of burning during operation, and it is total that secondary air flow accounts for burning
The 50~80% of air quantity.
5. depth suppression nitrogen recycle stream fluidized bed boiler according to claim 1, it is characterised in that the turbine central tube (12) is adopted
With spiral streamlined structure, the blade rotation direction of turbine and flow rotation direction are different in cylinder, and cylinder is overall using heat-resistance stainless steel
Casting forms.
6. depth suppression nitrogen recycle stream fluidized bed boiler according to claim 1, it is characterised in that the flue gas flow guiding dummy club (9)
Thickness is adjustable, adjustable range 20mm~1500mm.
7. depth suppression nitrogen recycle stream fluidized bed boiler according to claim 1, it is characterised in that the burner hearth emulsion zone (3) is poured
Material feeding surface, bottom water-cooling wall (5) the heat-transfer surface surface of burner hearth and burner hearth curtain wall (7) surface are arranged with no ammonia and urged
Change coating.
8. depth suppression nitrogen recycle stream fluidized bed boiler according to claim 1, it is characterised in that the bell-type windshield (2), cigarette
Gas flow guiding dummy club (9), the cylinder inboard wall of turbine central tube (12) and blade surface are provided with no ammonia catalyst coatings.
9. nitrogen recycle stream fluidized bed boiler is pressed down according to the depth of claim 7 or 8, it is characterised in that the no ammonia catalyst coatings
Thickness range 0.5mm~20mm.
10. depth suppression nitrogen recycle stream fluidized bed boiler according to claim 7, it is characterised in that the no ammonia catalyst coatings are used
In castable or moldable region, its surface is attached to, or with castable or moldable being mixed to form wear-resisting Catalytic Layer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720502996.5U CN206786703U (en) | 2017-05-08 | 2017-05-08 | A kind of depth presses down nitrogen recycle stream fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720502996.5U CN206786703U (en) | 2017-05-08 | 2017-05-08 | A kind of depth presses down nitrogen recycle stream fluidized bed boiler |
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| Publication Number | Publication Date |
|---|---|
| CN206786703U true CN206786703U (en) | 2017-12-22 |
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| CN201720502996.5U Active CN206786703U (en) | 2017-05-08 | 2017-05-08 | A kind of depth presses down nitrogen recycle stream fluidized bed boiler |
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2017
- 2017-05-08 CN CN201720502996.5U patent/CN206786703U/en active Active
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