CN207729579U - A kind of flue gas recirculation gas fired-boiler - Google Patents
A kind of flue gas recirculation gas fired-boiler Download PDFInfo
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- CN207729579U CN207729579U CN201721732217.7U CN201721732217U CN207729579U CN 207729579 U CN207729579 U CN 207729579U CN 201721732217 U CN201721732217 U CN 201721732217U CN 207729579 U CN207729579 U CN 207729579U
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- flue
- boiler
- smoke box
- flue gas
- gas recirculation
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Abstract
A kind of flue gas recirculation gas fired-boiler, including shell, flue, combustor interface, burner, the front and back setting front smoke box of the flue and rear smoke box, the flue front connects combustor interface, and the flue rear portion connects return combustion chamber, smoke pipe is threaded between the return combustion chamber and the front smoke box, outlet flue is arranged in the front smoke box, is connected to by flue gas recirculation pipe between the outlet flue and the burner.The part of smoke of heated surface at the end of boiler lower temperature is sent into burner hearth 2 by the utility model by recirculation blower, to play the role of changing the combustion conditions and heat-transfer character of boiler.
Description
Technical field
The utility model is related to a kind of gas fired-boiler, more particularly to a kind of flue gas recirculation gas fired-boiler.
Background technology
To increase prevention and cure of air pollution dynamics, Optimization of Energy Structure effectively improves clean energy resource and utilizes ratio, and country is energetically
Promote application of the industrial combustion gas boiler in heating, industrial production.For coal-burning boiler, the particulate matter of gas fired-boiler and
SO2The problems such as discharge capacity is greatly decreased, and effectively reduces environmental pollution rate, but exceeded there are still nitrogen oxide emission.Combustion
The nitrogen oxides main component of steam stove discharge is NO, and has a small amount of NO2, in addition to except pollution environment itself and being detrimental to health,
Can also generate nitric acid mist and nitrate by a series of physical-chemical reaction in an atmosphere, and can under light illumination with nytron
Object, ozone etc. generate photochemical fog, to generate the influence of bigger to atmospheric environment.It can be seen that development low NOx combustion skill
Art is with limitation NOx emission to the place of environmental protection, the meaning of air conservation.NOx in industrial production largely comes from
In high-temperature heating process, therefore a kind of reduction ignition temperature is studied, stop of the dilution oxygen concentration with reduction flue gas in high-temperature region
The technology of time has become current imperative project.
Invention content
In view of the deficiencies of the prior art, the utility model provides a kind of flue gas recirculation gas fired-boiler.
The technical solution adopted in the utility model is：A kind of flue gas recirculation gas fired-boiler, including shell, flue, burning
Machine interface, burner, the front and back setting front smoke box of the flue and rear smoke box, the flue front connects combustor interface, described
Flue rear portion connects return combustion chamber, and smoke pipe is threaded between the return combustion chamber and the front smoke box, and smoke is arranged in the front smoke box
Mouthful, it is connected to by flue gas recirculation pipe between the outlet flue and the burner.
A kind of flue gas recirculation gas fired-boiler, it is characterized in that：The outlet flue be sequentially connected first-stage condenser and
Secondary condenser, the first-stage condenser, secondary condenser are set to above shell.
A kind of flue gas recirculation gas fired-boiler, it is characterized in that：The flue is corrugated internal furnace.
A kind of flue gas recirculation gas fired-boiler, it is characterized in that：Smoke box is enclosed construction after described.
The part of smoke of heated surface at the end of boiler lower temperature is sent into burner hearth by the utility model by recirculation blower
2, to play the role of changing the combustion conditions and heat-transfer character of boiler.When flue gas recycled is sent directly into burner hearth from burner
When 2 inside, since the temperature of flue gas recycled is much lower compared with fire box temperature（General fire box temperature at 2000 DEG C or so,
And flue gas recycled temperature is 250 DEG C~350 DEG C）, the temperature levels in burner hearth can be significantly reduced；Secondly because tail flue gas
It is gas after fuel combustion and the mixture to leak out on a small quantity, oxygen content is low, and flue gas recycled effectively reduces after entering burner hearth
Oxygen concentration in burner hearth.Therefore it is dense to further reduce oxygen while reducing fire box temperature for flue gas recirculating technique
Degree can effectively inhibit the formation of NOx in combustion process, reduce the pollution to air.For gas fired-boiler, NOx
Discharge capacity can reduce by 20%~70%, minimum reachable 30mg/m3, by the exhaust gas temperature of boiler be reduced to 60 DEG C hereinafter, boiler heat
Efficiency improves 98% or more, to achieve the purpose that efficient, energy-saving and environmental protection.
Description of the drawings
FIG. 1 is a schematic structural view of the utility model；
In figure：1- shells, 2- flues, 3- combustor interfaces, 4- burners, 5- front smoke boxs, 6- outlet flues, 7- flue gases follow again
Endless tube, 8- first-stage condensers, 9- secondary condensers, 10- return combustion chambers, smoke box after 11-, 12- manholes, 13- stay bolt bars, 14- spiral shells
Line smoke pipe.
Specific implementation mode
As shown in Figure 1, a kind of condensation integrated gas boiler, including furnace shell 1, furnace shell sets gradually front smoke box from front to back
5, flue 2, return combustion chamber 10, rear smoke box 11, flue side is threaded smoke pipe 14, shell front end setting burner 4 and combustor
Interface 3, combustor interface 3 be connected to flue 2, shell rear end be arranged manhole 12 be connected to return combustion chamber 10,2 rear end of flue with strile-back
Room 10 is connected to, and return combustion chamber 10 is connected to front smoke box 5 by threaded flue 14, setting outlet flue 6 at the top of shell, first-stage condenser 8,
Secondary condenser 9, outlet flue 6 connect front smoke box, first-stage condenser 8, secondary condenser 9, outlet flue 6 are sequentially connected after outlet flue
It is connected to by flue gas recirculation pipe 7 between burner 4, stay bolt bar 13, rear smoke box 9 is set between return combustion chamber 10 and rear smoke box 11
For enclosed construction.
Burner, which is sprayed by combustor interface in flue, to burn, and the flue gas for generation of burning enters screw thread by return combustion chamber 10
Smoke pipe 14 enters front smoke box 5 after threaded flue heat convection, cold into first order condenser 8, the second level by outlet flue 6
Condenser 9 is discharged into air.Water heat convection of the flue gas in I and II condenser and finned tube, heat in flue gas is made full use of,
The latent heat that obvious heat of smoke also flue gas is not only utilized also makes full use of, and greatly reduces the exhaust gas temperature of boiler, improves boiler
The thermal efficiency.The rear smoke box 9 of boiler is enclosed construction, and smokeless passes through, and the radiation loss of rear smoke box is greatly reduced, to carry
The high thermal efficiency of boiler.The low-temperature flue gas of front smoke box is by outlet flue, and flue gas recirculation pipe is sent into burner, then again by firing
Burner is sent into burner hearth, to not only reduce temperature levels in burner hearth, and is the gas after fuel combustion due to tail flue gas
Body and the mixture to leak out on a small quantity, oxygen content is low, and it is dense that flue gas recycled enters the oxygen effectively reduced in burner hearth after burner hearth
Degree, therefore flue gas recirculating technique further reduces oxygen concentration while reducing fire box temperature, can effectively inhibit to fire
The formation of NOx during burning reduces the pollution to air.Smoke pipe uses threaded flue, enhances the disturbance of flue gas itself, improves
The heat-exchange time and the coefficient of heat transfer of flue gas, make the thermal efficiency of boiler improve.Flue space is big, and Net long wave radiation heating surface area is big,
The heating surface area of boiler is set to be optimised utilization；Gas stream in the stove even tissue, and the volume of reflux is inhaled due to high-speed flame and is made
With, reduce the temperature levels of flame region, effectively inhibit the generation of NOx, simultaneously because reflux action of turbulent flow, increase
The heat convection of air-flow and wall surface, smoke pipe are single backhaul, effectively reduce the flue gas resistance of ontology.Structure and manufacturing process letter
List, characteristics of compact layout, maintenance cost are low.One, two condensers are arranged in the top of boiler, with boiler body whole Transporting, subtract significantly
The installation procedure for having lacked scene, has saved boiler room space.
Claims (4)
1. a kind of flue gas recirculation gas fired-boiler, including shell（1）, flue（2）, combustor interface（3）, burner（4）, special
Sign is：The flue is front and back to be arranged front smoke box（5）With rear smoke box（11）, the flue front connects combustor interface（3）, described
Flue rear portion connects return combustion chamber（10）, smoke pipe is threaded between the return combustion chamber and the front smoke box（14）, the front smoke box
Outlet flue is set（6）, pass through flue gas recirculation pipe between the outlet flue and the burner（7）Connection.
2. a kind of flue gas recirculation gas fired-boiler according to claim 1, it is characterized in that：The outlet flue is sequentially connected one
Grade condenser（8）And secondary condenser（9）, the first-stage condenser, secondary condenser are set to above shell.
3. a kind of flue gas recirculation gas fired-boiler according to claim 1 or 2, it is characterized in that：The flue is ripple stove
Courage.
4. a kind of flue gas recirculation gas fired-boiler according to claim 1 or 2, it is characterized in that：Smoke box is closing after described
Structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721732217.7U CN207729579U (en) | 2017-12-13 | 2017-12-13 | A kind of flue gas recirculation gas fired-boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721732217.7U CN207729579U (en) | 2017-12-13 | 2017-12-13 | A kind of flue gas recirculation gas fired-boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207729579U true CN207729579U (en) | 2018-08-14 |
Family
ID=63098355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721732217.7U Active CN207729579U (en) | 2017-12-13 | 2017-12-13 | A kind of flue gas recirculation gas fired-boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207729579U (en) |
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2017
- 2017-12-13 CN CN201721732217.7U patent/CN207729579U/en active Active
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