CN205747964U - Fluidized-bed combustion boiler Load Regulation and low nitrogen combustion apparatus - Google Patents
Fluidized-bed combustion boiler Load Regulation and low nitrogen combustion apparatus Download PDFInfo
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- CN205747964U CN205747964U CN201620421899.9U CN201620421899U CN205747964U CN 205747964 U CN205747964 U CN 205747964U CN 201620421899 U CN201620421899 U CN 201620421899U CN 205747964 U CN205747964 U CN 205747964U
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- fluidized
- bed combustion
- combustion boiler
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Abstract
A kind of fluidized-bed combustion boiler Load Regulation and low nitrogen combustion apparatus, set up a shunt conduit on flue between sack cleaner and air-introduced machine and connect back to the input port of flow fan, the output channel of backflow blower fan connects the entrance to aerator, and the output airduct of aerator connects the air inlet to fluidized-bed combustion boiler after air preheater；Set up reducing equipment and the charging system of a set of coal of a coal in the burner hearth side of fluidized-bed combustion boiler, the reducing equipment output of coal is connected to the burner hearth of fluidized-bed combustion boiler by screw(-type) feeder, and the charging system of coal is also connected to the burner hearth of fluidized-bed combustion boiler；Secondary air inlet is installed in the middle part of the burner hearth of fluidized-bed combustion boiler.This utility model also has oxygen content table or amount of nitrogen oxides table and automaton.This utility model can realize the regulation of ultra-low load especially and run, and low nitrogen burning, the environment protecting of minimum discharge.
Description
Technical field
This utility model belongs to combustion method and technical field of combustion equipment, is specifically related to a kind of fluidized-bed combustion boiler Load Regulation and low nitrogen combustion apparatus.
Background technology
CFBB can obtain the higher thermal efficiency and preferable discharge index under declared working condition, but when underload, owing to fire box temperature field is uneven, furnace exit temperature is low, not only have impact on the thermal efficiency, steam parameter also affects existence and the denitration in the stove effect of nitrogen oxides.Therefore, current CFBB does not simply fail to accomplish Ultra-low load operation, more can not accomplish minimum discharge.
Summary of the invention
Technical problem to be solved in the utility model is: solve the problem that above-mentioned prior art exists, and a kind of fluidized-bed combustion boiler Load Regulation and low nitrogen combustion apparatus are provided, both the high load capacity of CFBB and the operation of normal duty can have been realized, underload and the regulation of ultra-low load and operation can be realized again, particularly can also realize the environment protecting of low nitrogen burning, minimum discharge.
The technical solution adopted in the utility model is: a kind of fluidized-bed combustion boiler Load Regulation and low nitrogen combustion apparatus, burner hearth including fluidized-bed combustion boiler, the drum at fluidized-bed combustion boiler top, the separator that fluidized-bed combustion boiler afterbody is sequentially connected with, superheater, economizer, the prefabricated device of air, sack cleaner, air-introduced machine and chimney, set up a shunt conduit on flue between sack cleaner and air-introduced machine and connect back to the input port of flow fan, the output channel of backflow blower fan connects the entrance to aerator, the output airduct of aerator connects the air inlet to fluidized-bed combustion boiler after air preheater；Set up reducing equipment and the charging system of a set of coal of a coal in the burner hearth side of fluidized-bed combustion boiler, the reducing equipment output of coal is connected to the burner hearth of fluidized-bed combustion boiler by screw(-type) feeder, and the charging system of coal is also connected to the burner hearth of fluidized-bed combustion boiler；Secondary air inlet is installed in the middle part of the burner hearth of fluidized-bed combustion boiler.
In technique scheme, oxygen content or the oxygen content table of amount of nitrogen oxides or amount of nitrogen oxides table in measurement flue gas is installed on the flue between superheater and economizer, oxygen content table or the output of amount of nitrogen oxides table are measured signal and are connected to automaton, and automaton output control signal connects and controls the blower fan that refluxes.
In technique scheme, the reducing equipment of described coal is disintegrating machine；The charging system of described coal is that stokehold increases feed hopper, and through bucket elevator, coal bed material is entered feed hopper, and feed hopper output connects screw(-type) feeder, and screw(-type) feeder output connects the burner hearth of fluidized-bed combustion boiler.
The Load Regulation of fluidized-bed combustion boiler and low nitrogen burning method, change the equivalent diameter of as-fired coal when Load Regulation is underload, reduce critical flow velocity, make load minimize value, is equipped with a charging system when high load capacity regulates；Described low nitrogen burning is for controlling oxygen amount, in the pre-burning stage anoxycausis of coal, generates CO, reduces NOx with CO, generates N and CO2, add secondary wind, in the after-flame stage, CO fully burnt, reduce incomplete combustion loss.
In technique scheme, the equivalent diameter of described change as-fired coal is to increase the reducing equipment of a coal, and the as-fired coal on belt is after reducing equipment, then sends into burner hearth by screw(-type) feeder；Described be equipped with charging system when high load capacity regulates be to increase feed hopper and screw(-type) feeder in stokehold, in advance through bucket elevator, qualified coal bed material is entered feed hopper, then enters burner hearth through screw(-type) feeder.
In technique scheme, above-mentioned reducing equipment is disintegrating machine, and the coal grain that particle diameter is 8-10mm is broken into the coal grain that particle diameter is below 5mm.
In technique scheme, the described pre-burning stage anoxycausis at coal is: being connected by backflow blower fan and pipeline by the flue gas of boiler tail sack cleaner and be delivered to blower inlet, this flue gas is delivered to the air inlet of burner hearth bottom together with natural air after air preheater preheats by aerator；Described addition secondary wind is to be provided with secondary air inlet in the middle part of burner hearth.
In technique scheme, described control oxygen amount is: is provided with oxygen content or the oxygen content table of amount of nitrogen oxides or amount of nitrogen oxides epoxy in measurement flue gas between the superheater and economizer of boiler tail and contains scale or amount of nitrogen oxides table, on the one hand oxygen content or amount of nitrogen oxides instruction are carried out, on the other hand oxygen content is measured in output or amount of nitrogen oxides signal is connected to automaton, automaton exports control signal after carrying out signal processing and connects back to flow fan, controls the uninterrupted of backflow blower fan.
Former combustion apparatus (air distribution plate and blast cap) irrational part also needs improve and optimize design.
Operation principle and remarkable result:
The Load Regulation of CFBB must wind, coal, bed material three sample regulate simultaneously, CFBB is for flameholding, its air quantity must be greater than critical air blast, owing to air quantity is restricted, so the underload regulatory function of CFBB is also restricted, critical flow velocity becomes three cubed relation with the equivalent diameter of as-fired coal, and the equivalent diameter changing as-fired coal just can reduce critical flow velocity, makes load minimize value.
Owing to decreasing critical flow velocity, decreasing the thickness of bed material, fluid height also decreases, and the caloric receptivity of such pipe laying is also greatly reduced, although the temperature of burner hearth maintains certain value, and load but can keep certain minuent.The effect of denitration is not interfered with the most yet.
Owing to changing the equivalent diameter of as-fired coal, introduce backflow wind, it is possible not only to Ultra-low load operation, and uniform temperature fields stared at by stove when ultra-low load, keep preferable furnace exit temperature and excess air coefficient, ensure that steam parameter and the raw emissions of nitrogen oxides and denitration effect, ensure that when ultra-low load steam parameter can accomplish minimum discharge.
That is, when underload, change the equivalent diameter of as-fired coal, both can ensure that underrun, and can ensure that again low nitrogen burning.
When needs high load capacity, bed material increases therewith, and the bed material accumulating rate by self is the slowest, it is impossible to tackles flexibly, meets technological requirement, so a charging system need to be equipped with.It is re-introduced into smoke backflow during underload, reduces the excess air coefficient in burner hearth, reduce the discharge of nitrogen oxides.
Its load regulation range of the fluidized-bed combustion boiler of prior art is at 50-110%, general boiler load on daytime is high, and evening, load was low, the most even as low as 20-30%, and the fluidized-bed combustion boiler of prior art just cannot run when load is less than 50%, because furnace bottom air compartment air intake is little, blow motionless fire coal, it is impossible to fluidized bed combustion, furnace bottom air compartment air intake is big, coal temperature is blown low, easily extinguishes, so existing fluidized-bed combustion boiler is most afraid of underrun at night.This utility model uses the equivalent diameter changing as-fired coal, namely by broken for the particle diameter of as-fired coal less after be re-fed into burner hearth, reduce air quantity, because coal particle size is little, the air intake that furnace bottom air compartment is the least, it is possible to blown afloat by fire coal, it is achieved fluidized bed combustion.This technological break-through of this utility model, can be down to 20% by fluidized-bed combustion boiler minimum load operation value from 50%, greatly improve technical performance and the serviceability of fluidized-bed combustion boiler.And when needs heavy-duty service, as long as recovering coal bed material to send into burner hearth through feed hopper and screw(-type) feeder.
Meanwhile, the discharged nitrous oxides of boiler combustion, national standard is 200mg/m3, minimum discharge area is 50 mg/m3, and its discharged nitrous oxides of existing fluidized-bed combustion boiler is at 250 mg/m3Above, therefore, the discharged nitrous oxides difficulty reducing boiler is the biggest.To this end, the out of stock method that some fluidized-bed combustion boilers use stove interior spray ammonia reduces discharged nitrous oxides, investment is big, and operating cost is high, and denitration rate also only has about 50%, and ammonia is very big to boiler tail corrosion simultaneously, affects boiler life.As a example by 130T fluidized-bed combustion boiler, investment reaches 2,000,000, additional operating cost.Also the fluidized-bed combustion boiler having uses stove external oxidation reducing process out of stock, reduces discharged nitrous oxides with this, and investment is bigger, reaches 5,000,000.This utility model uses in pre-burning stage anoxycausis, in burner hearth, the addition clean-burning method of secondary wind reduces the discharge of nitrogen oxides again, and this technological break-through of the present utility model makes the discharged nitrous oxides of fluidized-bed combustion boiler be down to ＜ 50 mg/m3, reach minimum discharge standard, simultaneously steam parameter deviation ＜ 5%, thermal efficiency ＞ 90%.
Accompanying drawing illustrates:
Fig. 1 is this utility model structure principle chart.
Description of reference numerals: 1 automaton, 2 charging systems, 3 reducing equipment, 4 screw(-type) feeders,
5 burner hearths, 6 oxygen content tables, 7 sack cleaners, 8 chimneys, 9 air-introduced machines, 10 backflow blower fans,
11 aerators, 12 separators, 13 drums, l4 superheater, 15 economizers, 16 air preheaters,
17 secondary air inlets.
Detailed description of the invention:
See Fig. 1, a kind of fluidized-bed combustion boiler Load Regulation of the present utility model and low nitrogen combustion apparatus, burner hearth including fluidized-bed combustion boiler, the drum at fluidized-bed combustion boiler top, the separator that fluidized-bed combustion boiler afterbody is sequentially connected with, superheater, economizer, the prefabricated device of air, sack cleaner, air-introduced machine and chimney, set up a shunt conduit on flue between sack cleaner and air-introduced machine and connect back to the input port of flow fan, the output channel of backflow blower fan connects the entrance to aerator, the output airduct of aerator connects the air inlet to fluidized-bed combustion boiler after air preheater；Set up reducing equipment and the charging system of a set of coal of a coal in the burner hearth side of fluidized-bed combustion boiler, the reducing equipment output of coal is connected to the burner hearth of fluidized-bed combustion boiler by screw(-type) feeder, and the charging system of coal is also connected to the burner hearth of fluidized-bed combustion boiler；Secondary air inlet is installed in the middle part of the burner hearth of fluidized-bed combustion boiler；Oxygen content or the oxygen content table of amount of nitrogen oxides or amount of nitrogen oxides table in measurement flue gas is installed on the flue between superheater and economizer, oxygen content table or nitrogen oxides is defeated goes out to measure signal containing scale and be connected to automaton, automaton output control signal connects and controls backflow blower fan；The reducing equipment of described coal is disintegrating machine；The charging system of described coal is that stokehold increases feed hopper, through bucket elevator, coal bed material is entered the output of feed hopper feed hopper and connects screw(-type) feeder, and screw(-type) feeder output connects the burner hearth of fluidized-bed combustion boiler.
Fluidized-bed combustion boiler Load Regulation of the present utility model and low nitrogen burning method, change the equivalent diameter of as-fired coal when Load Regulation is underload, reduce critical flow velocity, make load minimize value, is equipped with a charging system when high load capacity regulates；Described low nitrogen burning is for controlling oxygen amount, in the pre-burning stage anoxycausis of coal, generates CO, reduces NOx with CO, generates N and CO2, add secondary wind, in the after-flame stage, CO fully burnt, reduce incomplete combustion loss；The equivalent diameter of described change as-fired coal is to increase the reducing equipment of a coal, and the as-fired coal on belt is after reducing equipment, then sends into burner hearth by screw(-type) feeder.Described be equipped with charging system when high load capacity regulates be to increase feed hopper and screw(-type) feeder in stokehold, in advance through bucket elevator, qualified coal bed material is entered feed hopper, then enters burner hearth through screw(-type) feeder；Described reducing equipment is disintegrating machine, and the coal grain that particle diameter is 8-10mm is broken into the coal grain that particle diameter is below 5mm；The described pre-burning stage anoxycausis at coal is: being connected by backflow blower fan and pipeline by the flue gas of boiler tail sack cleaner and be delivered to blower inlet, this flue gas is delivered to the air inlet of burner hearth bottom together with natural air after air preheater preheats by aerator；Described addition secondary wind is to be provided with secondary air inlet in the middle part of burner hearth；Described control oxygen amount is: is provided with oxygen content or the oxygen content table of amount of nitrogen oxides or amount of nitrogen oxides epoxy in measurement flue gas between the superheater and economizer of boiler tail and contains scale or amount of nitrogen oxides table, on the one hand oxygen content or amount of nitrogen oxides instruction are carried out, on the other hand oxygen content is measured in output or amount of nitrogen oxides signal is connected to automaton, automaton exports control signal after carrying out signal processing and connects back to flow fan, controls the uninterrupted of backflow blower fan.
Claims (3)
1. a fluidized-bed combustion boiler Load Regulation and low nitrogen combustion apparatus, it is characterized in that: include the burner hearth of fluidized-bed combustion boiler, the drum at fluidized-bed combustion boiler top, the separator that fluidized-bed combustion boiler afterbody is sequentially connected with, superheater, economizer, the prefabricated device of air, sack cleaner, air-introduced machine and chimney, set up a shunt conduit on flue between sack cleaner and air-introduced machine and connect back to the input port of flow fan, the output channel of backflow blower fan connects the entrance to aerator, the output airduct of aerator connects the air inlet to fluidized-bed combustion boiler after air preheater；Set up reducing equipment and the charging system of a set of coal of a coal in the burner hearth side of fluidized-bed combustion boiler, the reducing equipment output of coal is connected to the burner hearth of fluidized-bed combustion boiler by screw(-type) feeder, and the charging system of coal is also connected to the burner hearth of fluidized-bed combustion boiler；Secondary air inlet is installed in the middle part of the burner hearth of fluidized-bed combustion boiler.
Fluidized-bed combustion boiler Load Regulation the most according to claim 1 and low nitrogen combustion apparatus, it is characterized in that: oxygen content or the oxygen content table of amount of nitrogen oxides or amount of nitrogen oxides table in measurement flue gas is installed on the flue between superheater and economizer, oxygen content table or the output of amount of nitrogen oxides table are measured signal and are connected to automaton, and automaton output control signal connects and controls the blower fan that refluxes.
Fluidized-bed combustion boiler Load Regulation the most according to claim 1 and low nitrogen combustion apparatus, it is characterised in that: the reducing equipment of described coal is disintegrating machine；The charging system of described coal is that stokehold increases feed hopper, carries into feed hopper by coal bed material through bucket elevator, and feed hopper output connects screw(-type) feeder, and screw(-type) feeder output connects the burner hearth of fluidized-bed combustion boiler.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620421899.9U CN205747964U (en) | 2016-05-11 | 2016-05-11 | Fluidized-bed combustion boiler Load Regulation and low nitrogen combustion apparatus |
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| CN201620421899.9U CN205747964U (en) | 2016-05-11 | 2016-05-11 | Fluidized-bed combustion boiler Load Regulation and low nitrogen combustion apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105841488A (en) * | 2016-05-11 | 2016-08-10 | 何相助 | Load adjustment and low-nitrogen combustion method and device for fluidized bed boiler |
-
2016
- 2016-05-11 CN CN201620421899.9U patent/CN205747964U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105841488A (en) * | 2016-05-11 | 2016-08-10 | 何相助 | Load adjustment and low-nitrogen combustion method and device for fluidized bed boiler |
| CN105841488B (en) * | 2016-05-11 | 2018-10-02 | 何相助 | Fluidized-bed combustion boiler Load Regulation and low nitrogen burning method and apparatus |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20161130 Effective date of abandoning: 20181002 |