CN209638993U - The flue gas recirculation system of CFB boiler NOx generation amount is reduced when underload - Google Patents
The flue gas recirculation system of CFB boiler NOx generation amount is reduced when underload Download PDFInfo
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- CN209638993U CN209638993U CN201822149894.7U CN201822149894U CN209638993U CN 209638993 U CN209638993 U CN 209638993U CN 201822149894 U CN201822149894 U CN 201822149894U CN 209638993 U CN209638993 U CN 209638993U
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- flue gas
- flue
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- gas recycled
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The flue gas recirculation system that CFB boiler NOx generation amount is reduced when underload, belongs to boiler environmental technology field.Technical solution includes air-introduced machine exhaust pass, flue gas recycled flue, volume damper etc.；The air-introduced machine exhaust pass is connect by the hole opened up in its exit with the import of flue gas recycled flue, the volume damper is located at the import of flue gas recycled flue, the insertion plate door is located at the outlet of flue gas recycled flue, the primary air fan in the hole that its air inlet opens up with the outlet of flue gas recycled flue by connecting, the air outlet of the primary air fan is connected with the air inlet in cold First air air duct, the air outlet in the cold First air air duct is connected with the cold end of air preheater, the hot end of the air preheater is connected with the air inlet in heat primary air air duct, the air outlet in the heat primary air air duct is connected with air compartment of burner hearth.The utility model have many advantages, such as it is at low cost, do not increase power consumption.
Description
Technical field
The utility model belongs to circulating fluidized bed boiler environmental technology field, and in particular to CFB boiler is reduced when underload
The flue gas recirculation system of NOx generation amount.
Background technique
2013, State Council has issued " about the opinion for accelerating development energy conservation and environmental protection industry " and " prevention and control of air pollution row
Dynamic plan ".2014, three ministries and commissions, which combine, printed and distributed " coal electricity energy-saving and emission-reduction upgrading and transformation action plan ", put into effect the severeest
Environmental protection policy and measure, for response, country is called, and thermal power plant in all parts of the country carries out gas pollution control technology to existing unit and changes
The enthusiasm made is also unprecedented surging, comes into effect " flue gas minimum discharge " advanced technology.
Circulating fluidized bed boiler denitrating flue gas generallys use selective non-catalytic reduction (SNCR), minimum discharge
After policy execution, SNCR denitration technology is relied solely on, is difficult to realize nitrogen oxides minimum discharge, therefore most of power plant is in original
On the basis of SNCR denitration, selective catalytic reduction (SCR) is increased newly, has been realized in a manner of SNCR plus SCR combined denitration
Nitrogen oxides minimum discharge, so that the consumption of denitrification reducing agent greatly increases, operating cost is consequently increased, and denitration restores
Agent is chemical products, higher to power plant's fire-fighting requirements, and there are some potential safety problemss.
Burning in circulating fluid bed boiler temperature general control can effectively inhibit heating power type in the range of 850-900 DEG C
The amount of being originally generated of nitrogen oxides, this is unique environment-friendly advantage that circulating fluidized bed boiler itself has.It is former to influence nitrogen oxides
The factor of beginning production quantity mainly uses bed temperature and burner hearth oxygen amount, and flue gas recirculation is exactly by less burner hearth oxygen amount come less nitrogen oxidation
The low NOx combusting technology of the object amount of being originally generated.Its working principle is that boiler tail part of smoke is sent into burner hearth, to reduce
Boiler oxygen amount adjusts reaction atmosphere, reduces the NOx amount of being originally generated.In circulating fluidized bed boiler environment protection field, flue gas recirculation is more
It is exported using flue gas by air-introduced machine or deduster is drawn, recycled blower is sent to the mode of existing primary air fan entrance, the party
There are problems, such as the viscous ash of recirculation blower blade, smoke condensation to corrode blade for formula, seriously affects flue gas recirculation system
Continuous and steady operation.
In view of the deficiency of existing flue gas recirculation system, need to develop a kind of be suitble under current flue gas minimum discharge situation
Flue gas recirculation system.
Utility model content
The purpose of this utility model is intended to the shortcomings that overcoming existing flue gas recirculation system, reduces CFB when providing underload
The flue gas recirculation system of boiler NOx generation amount.The system can reduce circulating fluidized bed boiler underrun significantly when
Burner hearth oxygen amount, is better achieved low nitrogen burning, achievees the effect that NOx emission is effectively reduced, while can extend flue gas recirculation
The system cycle of operation, the economy that develops skill and safety.
CFB boiler NOx is reduced when in order to achieve the above purposes, the technical solution adopted by the utility model is: underload to generate
The flue gas recirculation system of amount, including air-introduced machine exhaust pass, flue gas recycled flue, volume damper, insertion plate door, First air
Machine, cold First air air duct, air preheater, heat primary air air duct, burner hearth air compartment；The air-introduced machine exhaust pass by
The hole that its exit opens up is connect with the import of flue gas recycled flue, and the volume damper is located at flue gas recycled flue
Import, the insertion plate door are located at the outlet of flue gas recycled flue, the primary air fan by the hole that its air inlet opens up with
The outlet of flue gas recycled flue connects, and the air outlet of the primary air fan is connected with the air inlet in cold First air air duct, described
The air outlet in cold First air air duct is connected with the cold end of air preheater, the hot end and heat primary air air duct of the air preheater
Air inlet connection, the air outlet in the heat primary air air duct connects with air compartment of burner hearth.
Compared with prior art, the utility model has the following advantages that and effect:
1, the flue gas recirculation system increases circulating fan without additional, by flue gas recycled chimney intake end and outlet
Side pressure is poor, and flue gas recycled can be sent into boiler, and system does not increase power consumption；
2, the flue gas recirculation system circulation flue gas is exported quoted from air-introduced machine, and dustiness very little can mitigate circulating flue gas
Abrasion to flue gas recycled flue；
3, the flue gas recirculation system one-time investment is less, and denitration changes when being suitable for circulating fluidized bed boiler underload
It makes, so that NOx meets minimum discharge when boiler at low load；
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
Specific embodiment
As shown in Figure 1, the flue gas recirculation system of CFB boiler NOx generation amount is reduced described in the present embodiment when underload, packet
Include air-introduced machine exhaust pass 1, flue gas recycled flue 2, volume damper 3, insertion plate door 4, primary air fan 5, cold First air air duct
6, air preheater 7, heat primary air air duct 8, burner hearth air compartment 9；The air-introduced machine exhaust pass 1 in its exit by opening
If hole connect with the import of flue gas recycled flue 2, the volume damper 3 is located at the import of flue gas recycled flue 2, institute
The outlet that insertion plate door 4 is located at flue gas recycled flue 2 is stated, the primary air fan 5 is followed by the Kong Yuzai opened up in its air inlet
The outlet of ring flue gases duct 2 connects, and the air outlet of the primary air fan 5 is connected with the air inlet in cold First air air duct 6, described cold
The air outlet in First air air duct 6 is connected with the cold end of air preheater 7, the hot end of the air preheater 7 and heat primary air wind
The air inlet in road 8 connects, and air compartment 9 of air outlet and burner hearth in the heat primary air air duct 8 connects.
Claims (1)
1. reducing the flue gas recirculation system of CFB boiler NOx generation amount when underload, it is characterised in that: exported including air-introduced machine
Flue (1), flue gas recycled flue (2), volume damper (3), insertion plate door (4), primary air fan (5), cold First air air duct
(6), air preheater (7), heat primary air air duct (8), burner hearth air compartment (9)；The air-introduced machine exhaust pass (1) by
The hole that its exit opens up is connect with the import of flue gas recycled flue (2), and the volume damper (3) is located at flue gas recycled
The import of flue (2), the insertion plate door (4) are located at the outlet of flue gas recycled flue (2), the primary air fan (5) by
The hole that its air inlet opens up is connect with the outlet of flue gas recycled flue (2), the air outlet of the primary air fan (5) and cold primary
The air inlet in wind air duct (6) connects, and the air outlet of the cold First air air duct (6) is connected with the cold end of air preheater (7), institute
The hot end for stating air preheater (7) is connected with the air inlet of heat primary air air duct (8), the outlet air of the heat primary air air duct (8)
Air compartment (9) connection of mouth and burner hearth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822149894.7U CN209638993U (en) | 2018-12-20 | 2018-12-20 | The flue gas recirculation system of CFB boiler NOx generation amount is reduced when underload |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822149894.7U CN209638993U (en) | 2018-12-20 | 2018-12-20 | The flue gas recirculation system of CFB boiler NOx generation amount is reduced when underload |
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| Publication Number | Publication Date |
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| CN209638993U true CN209638993U (en) | 2019-11-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201822149894.7U Active CN209638993U (en) | 2018-12-20 | 2018-12-20 | The flue gas recirculation system of CFB boiler NOx generation amount is reduced when underload |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113007698A (en) * | 2021-02-07 | 2021-06-22 | 哈尔滨工业大学 | Combustion system for lower layer of opposed combustion boiler and use method |
-
2018
- 2018-12-20 CN CN201822149894.7U patent/CN209638993U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113007698A (en) * | 2021-02-07 | 2021-06-22 | 哈尔滨工业大学 | Combustion system for lower layer of opposed combustion boiler and use method |
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