CN208936144U - A kind of low nitrogen type circulating fluidized bed boiler based on optimization burning - Google Patents
A kind of low nitrogen type circulating fluidized bed boiler based on optimization burning Download PDFInfo
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- CN208936144U CN208936144U CN201821181330.5U CN201821181330U CN208936144U CN 208936144 U CN208936144 U CN 208936144U CN 201821181330 U CN201821181330 U CN 201821181330U CN 208936144 U CN208936144 U CN 208936144U
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- secondary air
- furnace body
- fluidized bed
- bed boiler
- circulating fluidized
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Abstract
The utility model discloses a kind of low nitrogen type circulating fluidized bed boiler based on optimization burning, it belongs to Sector of Cfb Boilers, including furnace body, an air compartment and secondary air chamber are successively arranged in furnace body, it is connected with separator at the top of furnace body, preheater is connected at the top of separator, the bottom of separator is equipped with returning charge pipeline and is connected to an air compartment, preheater is connected with deduster, and deduster is connected with chimney；Primary wind pipe is equipped between deduster and the bottom of furnace body, the side wall of furnace body is equipped with secondary air duct, and primary wind pipe and secondary air duct both pass through preheater；The utility model is imported into intracorporal first air compartment of furnace by the low oxygen-containing air that deduster is discharged, the oxidability of low oxygen-containing air is weakened, the generation of nitrogen oxides can be weakened, simultaneously, also fuel can be made to burn under oxygen debt combustion state, certain CO is generated, the NO in burner hearth can be reduced to by N by the stronger reproducibility of CO2, can also reduce the nitrogen oxides in boiler exhaust gas.
Description
Technical field
The utility model relates to Sector of Cfb Boilers, and in particular to a kind of low nitrogen type based on optimization burning
Circulating fluidized bed boiler.
Background technique
It emphasizes to put forth effort to solve prominent environmental problem in follow-up developments in the 19th Party Congress being a member of a political party, adheres to that the whole people are total
It controls, source prevention and treatment, persistently implements prevention and control of air pollution action, win blue sky defended war, and in the existing energy resource structure in China
Coal electricity occupies dominant contribution, and a large amount of coals to burn in coal fired generation process, which easily become, influences the important of air contaminant treatment
Influence element.In order to cope with the environmental problems such as nitrogen oxides, sulfide, flue dust of coal fired power generation generation, country have be directed to by
Step improves standard limit of smog release, supervises each fossil power plant to pass through technological transformation form contaminants associated dense in smoke evacuation to reduce
Degree.
For this project of discharged nitrous oxides concentration is reduced, domestic existing circulating fluidized bed boiler is usually in boiler
Denitration is carried out using selective non-catalytic reduction (SNCR) or selective catalytic reduction (SCR) mode at back-end ductwork.But
No matter which kind of above-mentioned mode is used, require additional arrangement and install many relevant devices additional, some is also needed to ciculation fluidized
The back-end ductwork heating surface arrangement of bed boiler carries out larger adjustment, and needs lasting to add into flue gas in the process of running
A large amount of denitrification reducing agent, operation and maintenance cost are higher.Meanwhile just because of the use of denitrification reducing agent easily to ciculation fluidized
The problems such as back-end surfaces of bed boiler cause burn into block, causes to seriously threaten to the operational safety of circulating fluidized bed boiler.
Utility model content
For the problems of in the prior art, a kind of low nitrogen type based on optimization burning provided by the utility model is followed
Circulation fluidized bed boiler, the characteristics of generation for nitrogen oxides during circulating fluidized bed boiler fuel combustion, to ciculation fluidized
The structure of bed boiler optimizes, and reduces the nitrous oxides concentration of circulating fluidized bed boiler tail portion smoke evacuation from the root, realizes
The purpose of circulating fluidized bed boiler low nitrogen burning.
To achieve the goals above, the technical solution adopted in the utility model is as follows:
A kind of low nitrogen type circulating fluidized bed boiler based on optimization burning, including furnace body, in the furnace body, it is bottom-up according to
Secondary to be equipped with an air compartment and secondary air chamber, the top of the furnace body is equipped with the first exhanst gas outlet, and first exhanst gas outlet passes through
Pipeline is connected with separator, and the top of the separator is equipped with the second exhanst gas outlet, and the bottom of the separator is equipped with refeed line
Road is connected to an air compartment, and second exhanst gas outlet is connected with preheater by pipeline, and the preheater passes through pipeline
It is connected with deduster, the deduster is connected with chimney by pipeline；It is equipped between the deduster and the bottom of the furnace body
Primary wind pipe on the side wall of the furnace body, is equipped with secondary air duct to be connected at the position of the secondary air chamber, described
The other end of secondary air duct is equipped with Secondary Air blower, and described primary wind pipe and the secondary air duct both pass through the preheating
Device.
As a kind of perferred technical scheme, the separator is set as cyclone separator.
As a kind of perferred technical scheme, the separator includes cylinder and the taper cone barrel set on the bottom of cylinder,
First exhanst gas outlet is connected to the cylinder, and the inner wall of the axis and the cylinder of first exhanst gas outlet is tangent.
As a kind of perferred technical scheme, second smoke outlet is equipped with comburent air duct, the combustion-supporting sky
The other end of feed channel is equipped with combustion air blower.
As a kind of perferred technical scheme, the junction of described primary wind pipe and the deduster is equipped with recycling cigarette
Gas blower, described primary wind pipe are equipped with First air blower.
As a kind of perferred technical scheme, it is equipped between the secondary air duct and the side wall of the furnace body several secondary
To be connected to, the Secondary Air branch pipe is uniformly distributed wind branch pipe around the axis of the furnace body.
As a kind of perferred technical scheme, the Secondary Air branch pipe is along the secondary air duct to the side of the furnace body
To tilting down, tilt angle is 5-10 degree.
As a kind of perferred technical scheme, the Secondary Air branch pipe is extend into the furnace body, the Secondary Air branch
It is 10-40 centimetres that pipe, which extend into the intracorporal length of the furnace,.
As a kind of perferred technical scheme, the Secondary Air branch pipe is divided into two layers of distribution on the side wall of the furnace body.
The beneficial effects of the utility model are shown:
1, the utility model is imported into intracorporal first air compartment of furnace by the low oxygen-containing air that deduster is discharged, low to contain
The oxidability of oxygen air is weakened, and the generation of nitrogen oxides can be weakened, meanwhile, also fuel can be made in oxygen debt combustion state
Lower burning, generates certain CO, the NO in burner hearth can be reduced to N by CO stronger reproducibility2, can also reduce boiler row
Nitrogen oxides in cigarette.
2, the utility model can be effectively by the combustible in flue gas by the returning charge pipeline being arranged at an air compartment
It recycles and burns, improve efficiency of combustion；Secondary air duct at secondary air chamber can disturb flue gas, enhance furnace body
Inner concentric zone it is fluidity, improve whole combustion efficiency.
3, First air can be improved in the preheater of the utility model and Secondary Air enters the intracorporal initial temperature of furnace, not
In the case where consuming additional energy source, combustion efficiency is improved.
Detailed description of the invention
Fig. 1 is a kind of overall structure signal of the low nitrogen type circulating fluidized bed boiler based on optimization burning of the utility model
Figure；
In figure: 1- furnace body, 2- secondary air chamber, air compartment of 3-, 4- secondary air duct, the first exhanst gas outlet of 5-, 6- separation
Device, 7- returning charge pipeline, the second exhanst gas outlet of 8-, 9- preheater, 10- Secondary Air blower, 11- deduster, 12- primary wind pipe,
13- First air blower, 14- flue gas recycled blower, 15- chimney.
Specific embodiment
In order to facilitate the understanding of those skilled in the art, the utility model will be further described below with reference to the accompanying drawings.
As shown in Figure 1, the utility model includes furnace body 1, in furnace body 1, bottom-up air compartment 3 and secondary of being successively arranged
Air compartment 2, an air compartment 3 and secondary air chamber 2 carry out the primary combustion and second-time burning of fuel respectively；The top of furnace body 1 is equipped with the
One exhanst gas outlet 5, the first exhanst gas outlet 5 are connected with separator 6 by pipeline, and the top of separator 6 is equipped with the second exhanst gas outlet
8, the bottom of separator 6 is equipped with returning charge pipeline 7 and is connected to an air compartment 3, and separator 6 is for isolating the particle in flue gas
Come, particle is returned in an air compartment 3 by returning charge pipeline 7 to burn again, and the flue gas after separation passes through 8 row of the second exhanst gas outlet
Out；Second exhanst gas outlet 8 is connected with preheater 9 by pipeline, and preheater 9 is connected with deduster 11, deduster 11 by pipeline
For the dust in further separating flue, deduster 11 is connected with chimney 15 by pipeline, and chimney 15 is by the flue gas after separation
Discharge；Primary wind pipe 12 is equipped between deduster 11 and the bottom of furnace body 1 to be connected to, primary wind pipe 12 is used for deduster
Flue gas after 11 dedustings is transported in a bottom i.e. air compartment 3 for furnace body 1, and oxygen content is lower in the flue gas, and oxidability is
Weaken, the generation of nitrogen oxides can be weakened, meanwhile, it so that fuel is burnt under oxygen debt combustion state in an air compartment 3, produce
Raw certain CO, can be reduced to N for the NO in burner hearth by the stronger reproducibility of CO2, can also reduce the nitrogen in boiler exhaust gas
Oxide；On the side wall of furnace body 1, secondary air duct 4, the other end of secondary air duct 4 are equipped at the position of secondary air chamber 2
Equipped with Secondary Air blower 10, primary wind pipe 12 and secondary air duct 4 both pass through preheater 9, and secondary air duct 4 is by outside air
It is introduced into secondary air chamber 2, the flue gas in secondary air chamber 2 can be disturbed, enhance the stream of 1 inner concentric zone of furnace body
The property changed improves integral combustion effect.
Wherein, separator 6 is set as cyclone separator, cyclone separator be using solid particle in centrifugal force separate air-flow or
The equipment of drop；Separator 6 includes cylinder and the taper cone barrel set on bottom of cylinder, and the first exhanst gas outlet 5 is connected to cylinder, and first
The axis of exhanst gas outlet 5 and the inner wall of cylinder are tangent, and flue gas enters separator 6 with the tangential direction of cylinder inner wall and has more greatly
Centrifugal force, particle can separate preferably from flue gas.
Comburent air duct (not shown) is equipped at second exhanst gas outlet 8, the other end of comburent air duct is equipped with
Outside air can be transported to the pipe at the second exhanst gas outlet 8 by combustion air blower (not shown), combustion air blower
In road, so that the combustible component in flue gas is burnt at the second exhanst gas outlet 8 completely, reduce unburnt heat loss, guarantees
Efficiency of combustion；The junction of primary wind pipe 12 and deduster 11 is equipped with flue gas recycled blower 14, flue gas recycled blower 14
For the flue gas after 11 dedusting of deduster to be transported in furnace body 1；Primary wind pipe 12 is equipped with First air blower 13, First air
Partial air can be transported in primary wind pipe 12 and mix with flue gas by blower 13, be transported in furnace body 1 so as to adjust
Flue gas in oxygen content.
Several Secondary Air branch pipes are equipped between secondary air duct 4 and the side wall of furnace body 1 to be connected to, Secondary Air branch pipe is around furnace body
1 axis is uniformly distributed, and 4 inner second air of secondary air duct can be improved to the disturbance effect of the flue gas in secondary air chamber 2；It is secondary
Direction of the wind branch pipe along secondary air duct 4 to furnace body 1 tilts down, and tilt angle is 5-10 degree, and Secondary Air branch pipe protrudes into
Into furnace body 1, it is 10-40 centimetres that Secondary Air branch pipe, which extend into the length in the furnace body 1, so that Secondary Air enters in furnace body 1
When can biggish rigidity can form good jeting effect, penetrability of the Secondary Air in furnace body 1 is improved, so that Secondary Air base
This range can increase, and will not comparatively fast be upset by the air-flow in furnace body 1；Secondary Air branch pipe is divided into two layers on the side wall of furnace body 1
Distribution, can increase the region of secondary wind disturbance in vertical direction, further increase combustion efficiency.
Above content is only the structure example and explanation to the utility model, the technologies of affiliated the art
Personnel make various modifications or additions to the described embodiments or are substituted in a similar manner, without departing from
The structure of utility model or beyond the scope defined by this claim, all should belong to the protection range of the utility model.
Claims (9)
1. a kind of low nitrogen type circulating fluidized bed boiler based on optimization burning, characterized in that including furnace body, in the furnace body, certainly
It is successively arranged an air compartment and secondary air chamber upwards down, the top of the furnace body is equipped with the first exhanst gas outlet, first flue gas
Outlet is connected with separator by pipeline, and the top of the separator is equipped with the second exhanst gas outlet, and the bottom of the separator is set
There is returning charge pipeline to be connected to an air compartment, second exhanst gas outlet is connected with preheater, the preheater by pipeline
It is connected with deduster by pipeline, the deduster is connected with chimney by pipeline；The bottom of the deduster and the furnace body
Between be equipped with primary wind pipe to be connected to, on the side wall of the furnace body, at the position of the secondary air chamber be equipped with Secondary Air
The other end of pipeline, the secondary air duct is equipped with Secondary Air blower, and described primary wind pipe and the secondary air duct are worn
Cross the preheater.
2. a kind of low nitrogen type circulating fluidized bed boiler based on optimization burning according to claim 1, characterized in that described
Separator is set as cyclone separator.
3. a kind of low nitrogen type circulating fluidized bed boiler based on optimization burning according to claim 1, characterized in that described
Separator includes cylinder and the taper cone barrel set on the bottom of cylinder, and first exhanst gas outlet is connected to the cylinder, described
The axis of first exhanst gas outlet and the inner wall of the cylinder are tangent.
4. a kind of low nitrogen type circulating fluidized bed boiler based on optimization burning according to claim 1, characterized in that described
Second smoke outlet is equipped with comburent air duct, and the other end of the comburent air duct is equipped with combustion air blower.
5. a kind of low nitrogen type circulating fluidized bed boiler based on optimization burning according to claim 1, characterized in that described
The junction of primary wind pipe and the deduster is equipped with flue gas recycled blower, and described primary wind pipe is equipped with First air wind
Machine.
6. a kind of low nitrogen type circulating fluidized bed boiler based on optimization burning according to claim 1, characterized in that described
Several Secondary Air branch pipes are equipped between secondary air duct and the side wall of the furnace body to be connected to, the Secondary Air branch pipe is around the furnace
The axis of body is uniformly distributed.
7. a kind of low nitrogen type circulating fluidized bed boiler based on optimization burning according to claim 6, characterized in that described
Direction of the Secondary Air branch pipe along the secondary air duct to the furnace body tilts down, and tilt angle is 5-10 degree.
8. a kind of low nitrogen type circulating fluidized bed boiler based on optimization burning according to claim 6, characterized in that described
Secondary Air branch pipe is extend into the furnace body, and it is 10-40 centimetres that the Secondary Air branch pipe, which extend into the intracorporal length of the furnace,.
9. a kind of low nitrogen type circulating fluidized bed boiler based on optimization burning according to claim 6, characterized in that described
Secondary Air branch pipe is divided into two layers of distribution on the side wall of the furnace body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821181330.5U CN208936144U (en) | 2018-07-25 | 2018-07-25 | A kind of low nitrogen type circulating fluidized bed boiler based on optimization burning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821181330.5U CN208936144U (en) | 2018-07-25 | 2018-07-25 | A kind of low nitrogen type circulating fluidized bed boiler based on optimization burning |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208936144U true CN208936144U (en) | 2019-06-04 |
Family
ID=66716496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821181330.5U Active CN208936144U (en) | 2018-07-25 | 2018-07-25 | A kind of low nitrogen type circulating fluidized bed boiler based on optimization burning |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208936144U (en) |
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2018
- 2018-07-25 CN CN201821181330.5U patent/CN208936144U/en active Active
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