CN207065552U - A kind of low-temperature smoke recirculation system for reducing CFBB NOx emission - Google Patents
A kind of low-temperature smoke recirculation system for reducing CFBB NOx emission Download PDFInfo
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- CN207065552U CN207065552U CN201720502265.0U CN201720502265U CN207065552U CN 207065552 U CN207065552 U CN 207065552U CN 201720502265 U CN201720502265 U CN 201720502265U CN 207065552 U CN207065552 U CN 207065552U
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Abstract
A kind of low-temperature smoke recirculation system for reducing CFBB NOx emission, including：Recirculation conduit, the low-temperature flue gas drawn by the air-introduced machine being arranged between deduster and wet desulphurization device is led to and mixed with First air；Recirculation blower, it is arranged on recirculation conduit, to low-temperature flue gas pressure-increasing unit；Valve, it is arranged on recirculation conduit, controls flow, the route of low-temperature flue gas；Flue gas flow meter, flue gas pressures measuring cell and smoke temperature measurement element, it is arranged on recirculation conduit, measure the flow of low-temperature flue gas, pressure and temperature, the utility model can reduce CFBB operation bed temperature, realize the air classification needed for low nitrogen burning, in the case where ensureing that fluidized wind total amount is constant, reduce the primary air flow for fluidisation, increase Secondary Air ratio, strengthened Secondary Air classification combustion characteristics, reduce the NOx of burning generation in stove, in addition, the system can be applied in combination with SNCR or SCR, further reduce CFBB NOx emission.
Description
Technical field
The utility model belongs to boiler environmental technology field, is related to nitrogen oxides in effluent (NOx) emission control, especially relates to
A kind of and low-temperature smoke recirculation system for reducing CFBB NOx emission.
Background technology
CFBB has the characteristics that wide fuel tolerance, high combustion efficiency, cost of investment are low, at home and abroad
Rapid development is arrived.The technology for reducing coal-fired boiler NOx discharge mainly divides three classes：Low NOx combustion, burner hearth injection reduction in stove
The SCR cigarette of SNCR denitrating flue gas (abbreviation SNCR) and stove rear pass the injection reducing agent of agent
Qi exhaustion nitre (abbreviation SCR), this three types of technology may be used alone, can also be used in combination.
At present, the SNCR or SCR denitration technology generally used in CFBB field of Environment Protection, its operation need to consume
A large amount of denitrification reducing agents, operating cost is higher, and denitrification reducing agent is chemical products, higher to power plant's fire-fighting requirements, peace be present
Full hidden danger.
Flue gas recirculation belongs to low NOx combusting technology in a kind of stove, and its operation principle is by the low-temperature flue gas of boiler tail
A part by recirculation blower be sent into burner hearth, so as to change boiler heat distribution, reduce partial combustion temperature, regulation reaction
Atmosphere.For coal-powder boiler, flue gas recirculation is usually to collect the flue gas in boiler economizer exit, passes through reduced air power traction
Enter burner hearth.Because flue gas recycled temperature is higher, particularly dust concentration is high, so recirculation blower can only short-period used；
CFBB field of Environment Protection, flue gas recirculation are exported by air-introduced machine using flue gas and drawn more, and recycled blower fan is delivered to
There are problems in the mode of existing primary air fan entrance, which, such as the viscous ash of primary air fan blade, vibrate excessive, flue gas knot
Dew corrosion etc., has a strong impact on flue gas recirculation system continuous and steady operation.
The content of the invention
It is of the present utility model in order to overcome shortcoming present in above-mentioned existing denitration technology especially flue gas recirculating technique
Purpose is to provide a kind of low-temperature smoke recirculation system for reducing CFBB NOx emission, and the system can be notable
Ground reduces CFBB operation bed temperature, and low nitrogen fractional combustion is better achieved, and reaches the effect for effectively reducing NOx emission
Fruit, while flue gas recirculation system operation cycle, the economy that develops skill and security can be extended.
To achieve these goals, the technical solution adopted in the utility model is：
A kind of flue gas recirculation method for reducing CFBB NOx emission, after dust removal process, before wet desulphurization
Low-temperature flue gas, mixed with First air through supercharging and deliver to burner hearth bottom air compartment, in the case where guarantee fluidized wind total amount is constant, subtracted
Few primary air flow for fluidizing, increase Secondary Air ratio, strengthened Secondary Air classification combustion characteristics, reduce in stove and burn
The NOx of generation.
The utility model additionally provides a kind of low-temperature smoke recirculation system for reducing CFBB NOx emission,
Including：
Recirculation conduit, low-temperature flue gas is led to and mixed with First air, the low-temperature flue gas by be arranged on deduster 6 with it is wet
Air-introduced machine 7 between method desulfurizer 8 is drawn；
Recirculation blower 12, it is arranged on the recirculation conduit, pressure-increasing unit is carried out to the low-temperature flue gas；
Valve, it is arranged on the recirculation conduit, controls flow, the route of the low-temperature flue gas；
Flue gas flow meter 15, it is arranged on the recirculation conduit, measures the flow of the low-temperature flue gas；
Flue gas pressures measuring cell 16, it is arranged on the recirculation conduit, measures the pressure of the low-temperature flue gas；
Smoke temperature measurement element 17, it is arranged on the recirculation conduit, measures the temperature of the low-temperature flue gas.
One end of the recirculation conduit and the outlet of air-introduced machine 7 or inlet communication, and be provided with connecting pipeline
Bypass valve 1 or bypass valve 2 102, the other end connect with the inlets or outlets of air preheater 4, and on connecting pipeline
Bypass valve 3 103 or bypass valve 4 104 are provided with, by bypass valve 1 and bypass valve 2 102, adjustment low-temperature flue gas is by drawing
Blower fan 7 is exported or import is drawn, and by bypass valve 3 103 or bypass valve 4 104, adjustment low-temperature flue gas introduces air preheater 4
Import or export.
The inlet flue gas flow of recirculation blower 12 and temperature are adjustable, are provided with the entrance of recirculation blower 12
Manually-operated gate 1, outlet are disposed with manually-operated gate 2 13 and electrically operated valve 14, carry out low-temperature flue gas Flow-rate adjustment, and then
Realize that low-temperature flue gas accounts for the proportion adjustment of First air total amount.
The deduster 6 is that either sack cleaner or electrostatic fabric filter, low-temperature flue gas pass through deduster 6 to electric cleaner
Dust removal process, dust concentration are greatly reduced.
The utility model flue gas recirculation system can be applied in combination with SNCR or SCR, further reduce recirculating fluidized bed pot
Stove NOx emission.
Compared with prior art, the beneficial effects of the utility model are：
1st, flue gas recirculation system can substantially reduce CFBB NOx emission；
2nd, low-temperature flue gas, which introduces burner hearth, can significantly reduce CFBB operation bed temperature；
3rd, low-temperature flue gas passes through deduster dust removal process, and dust concentration is greatly reduced, and weakens the abrasion to recirculation blower,
Extend the flue gas recirculation system operation cycle；
4th, low-temperature flue gas is without primary air fan, avoids causing the viscous ash of primary air fan blade, vibration is excessive, smoke condensation is rotten
The problems such as erosion；
5th, introduce burner hearth air compartment low-temperature flue gas flow and temperature can flexible modulation, so as to improve recirculating fluidized bed pot
The flexibility of stove operation；
6th, low-temperature flue gas introduce burner hearth can reduce First air and emulsion zone oxygen amount, instead of First air oxygen amount by Secondary Air
Fill into, increase secondary air ratio, the air classification needed for low nitrogen burning is better achieved；
7th, flue gas recirculation system can be applied in combination with SNCR or SCR technology, further reduce CFBB
NOx emission.
Brief description of the drawings
Fig. 1 is the utility model structure diagram.
1st, First air air compartment；2nd, burner hearth；3rd, back-end ductwork；4th, air preheater；5th, primary air fan；6th, deduster；7th, draw
Blower fan；8th, Wet FGD；9th, chimney；101st, bypass valve one；102nd, bypass valve two；103rd, bypass valve three；104th, it is other
Road valve four；11st, manually-operated gate one；12nd, recirculation blower；13rd, manually-operated gate two；14th, motor-driven valve；15th, flue gas flow meter；16、
Flue gas pressures measuring cell；17th, smoke temperature measurement element.
Embodiment
Describe embodiment of the present utility model in detail with reference to the accompanying drawings and examples.
A kind of as shown in figure 1, low-temperature flue gas recycling system for reducing CFBB NOx emission of the present utility model
System, including recirculation conduit, valve, the measurement apparatus etc. of recirculation blower 12 and flue gas flow, pressure and temperature.The system
In, after flue gas flake hearth-tapping 2, Wet FGD 8 is drained into through back-end ductwork 3 and deduster 6, then discharged by chimney 9.Air
Preheater 4 is arranged in back-end ductwork 3, and the flue-gas temperature of process is reduced, obtains low-temperature flue gas, low-temperature flue gas passes through deduster
6 dust removal process, dust concentration are greatly reduced.Low-temperature flue gas is drawn before Wet FGD 8 is entered, at desulfurization
Reason, therefore, recirculation conduit is not required to preservative treatment.Low-temperature flue gas can export extraction by existing air-introduced machine 7, can also be by air inducing
The import of machine 7 is drawn.It can be achieved by switching bypass valve 1 and bypass valve 2 102.
Low-temperature flue gas installs hand-operated valve respectively by the pressure-increasing unit of recirculation blower 12, the import and export of recirculation blower 12
Door 11,13 carries out flue gas flow regulation with electrically operated valve 14.Flue gas recirculation system pipeline installs flue gas flow meter 15, cigarette respectively
Atmospheric pressure measuring cell 16 and smoke temperature measurement element 17.Low-temperature flue gas can deliver to air preheater 4 and export, can also
The import of air preheater 4 is delivered to, can be achieved by switching bypass valve 4 104 and bypass valve 3 103, finally mixed with First air
Afterwards, the First air air compartment 1 of the bottom of burner hearth 2 is delivered to.
The operation principle that flue gas recirculation system of the present utility model reduces CFBB NOx emission is：Protecting
In the case that card fluidized wind total amount is constant, the low-temperature flue gas of First air air compartment is led to by air-introduced machine import or export, it is possible to reduce
For the primary air flow of fluidisation, boiler emulsion zone bed temperature and oxygen amount are reduced, increases Secondary Air ratio, makes Secondary Air fractional combustion special
Property strengthened, and then reduce stove in burning generation NOx.
Claims (5)
- A kind of 1. low-temperature smoke recirculation system for reducing CFBB NOx emission, it is characterised in that including：Recirculation conduit, low-temperature flue gas is led to and mixed with First air, the low-temperature flue gas is by being arranged on deduster (6) and wet method Air-introduced machine (7) between desulfurizer (8) is drawn；Recirculation blower (12), is arranged on the recirculation conduit, and pressure-increasing unit is carried out to the low-temperature flue gas；Valve, it is arranged on the recirculation conduit, controls flow, the route of the low-temperature flue gas；Flue gas flow meter (15), is arranged on the recirculation conduit, measures the flow of the low-temperature flue gas；Flue gas pressures measuring cell (16), is arranged on the recirculation conduit, measures the pressure of the low-temperature flue gas；Smoke temperature measurement element (17), is arranged on the recirculation conduit, measures the temperature of the low-temperature flue gas.
- 2. reducing the low-temperature smoke recirculation system of CFBB NOx emission according to claim 1, its feature exists In, one end of the recirculation conduit and the outlet of air-introduced machine (7) or inlet communication, and bypass is provided with connecting pipeline Valve one (101) or bypass valve two (102), the other end connect with the inlets or outlets of air preheater (4), and in connecting pipeline On be provided with bypass valve three (103) or bypass valve four (104), by bypass valve one (101) and bypass valve two (102), adjustment is low Warm flue gas is exported by air-introduced machine (7) or import is drawn, and by bypass valve three (103) or bypass valve four (104), adjusts low-temperature flue gas Introduce air preheater (4) import or export.
- 3. reducing the low-temperature smoke recirculation system of CFBB NOx emission according to claim 1, its feature exists In the entrance of the recirculation blower (12) is provided with manually-operated gate one (11), and outlet is disposed with manually-operated gate two (13) With electrically operated valve (14), low-temperature flue gas Flow-rate adjustment is carried out, and then realize that low-temperature flue gas accounts for the proportion adjustment of First air total amount.
- 4. reducing the low-temperature smoke recirculation system of CFBB NOx emission according to claim 1, its feature exists In the deduster (6) is electric cleaner either sack cleaner or electrostatic fabric filter.
- 5. reducing the low-temperature smoke recirculation system of CFBB NOx emission according to claim 1, its feature exists In, it is applied in combination with SNCR or SCR, it is further to reduce CFBB NOx emission.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720502265.0U CN207065552U (en) | 2017-05-08 | 2017-05-08 | A kind of low-temperature smoke recirculation system for reducing CFBB NOx emission |
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| CN201720502265.0U CN207065552U (en) | 2017-05-08 | 2017-05-08 | A kind of low-temperature smoke recirculation system for reducing CFBB NOx emission |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106969351A (en) * | 2017-05-08 | 2017-07-21 | 中国华能集团清洁能源技术研究院有限公司 | It is a kind of to reduce the flue gas recirculation method and system of CFBB NOx emission |
| CN108759492A (en) * | 2018-06-15 | 2018-11-06 | 内蒙古君正化工有限责任公司 | A kind of control method of solid caustic soda molten salt furnace flue gas oxygen content |
| CN109340738A (en) * | 2018-08-31 | 2019-02-15 | 上海锅炉厂有限公司 | A kind of micro- oxygen-enriched combustion boiler system |
| CN110410771A (en) * | 2019-09-03 | 2019-11-05 | 上海锅炉厂有限公司 | A kind of flue gas recirculation system |
| CN114061317A (en) * | 2021-10-15 | 2022-02-18 | 辽宁中石新亚能源发展有限公司 | Low-nitrogen combustion transformation method and system for medium-grade kiln |
-
2017
- 2017-05-08 CN CN201720502265.0U patent/CN207065552U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106969351A (en) * | 2017-05-08 | 2017-07-21 | 中国华能集团清洁能源技术研究院有限公司 | It is a kind of to reduce the flue gas recirculation method and system of CFBB NOx emission |
| CN108759492A (en) * | 2018-06-15 | 2018-11-06 | 内蒙古君正化工有限责任公司 | A kind of control method of solid caustic soda molten salt furnace flue gas oxygen content |
| CN109340738A (en) * | 2018-08-31 | 2019-02-15 | 上海锅炉厂有限公司 | A kind of micro- oxygen-enriched combustion boiler system |
| CN110410771A (en) * | 2019-09-03 | 2019-11-05 | 上海锅炉厂有限公司 | A kind of flue gas recirculation system |
| CN110410771B (en) * | 2019-09-03 | 2024-04-26 | 上海锅炉厂有限公司 | Flue gas recirculation system |
| CN114061317A (en) * | 2021-10-15 | 2022-02-18 | 辽宁中石新亚能源发展有限公司 | Low-nitrogen combustion transformation method and system for medium-grade kiln |
| CN114061317B (en) * | 2021-10-15 | 2024-01-09 | 辽宁中石新亚能源发展有限公司 | Low-nitrogen combustion transformation method and system for medium-grade kiln |
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