CN205897130U - Circulating fluidized bed boiler fly ash circulation system - Google Patents

Abstract

The utility model relates to a circulating fluidized bed boiler fly ash circulation system, including controlling means and circulating device, circulating device includes the ash bucket, and reject bin is being connected on the one hand to the lower extreme of ash bucket, and on the other hand passes through ash conveying pipe and is connecting grey storehouse, and the upper end in grey storehouse sets up the dust pelletizing system, and the dust pelletizing system is linked together with reject bin, and the lower extreme in grey storehouse is being through connecting the feeder, and the feeder passes through dust inlet pipeline and is connecting furnace, the fan is still being connected to the one end of feeder, the utility model discloses intelligent degree is higher, can play energy saving and emission reduction's effect, can not produce secondary pollution.

Description

CFBB flying dust blood circulation

Technical field

This utility model is related to a kind of CFBB flying dust blood circulation.

Background technology

CFBB some deficiency of generally existing in running:

1., due to environmental protection and the needs of itself, the commonly used high heating value of fluidized-bed combustion boiler is coal-fired.The high coal of calorific value has ash Part low feature, thus causing ash concentration in boiler furnace low, leads to heat transfer coefficient to reduce so that under boiler on-load ability Fall.

2. often do not reach fully loaded coal-supplying amount during boiler operatiopn, the concentration that will also result in ash in boiler furnace is low, Heat transfer coefficient is led to reduce so that boiler thermal output reduces.

3. the fly ash combustible material producing in boiler operatiopn, has certain phosphorus content, directly drains and causes to waste.

Mainly there are two kinds with regard to fluidized-bed combustion boiler combustion energy saving scheme at present:

First, boiler combustion system automatization is adjusted；

2nd, boiler furnace adds the slag with phosphorus content or ashes are combustion-supporting.

The first scheme shortcoming: the fluidized-bed combustion boiler automatization devoting rate that runs in the market low with the presence of it Reason, load is unstable, primary equipment technology acuracy bottom.High-precision once set if realizing automatization and adjusting to change Standby, increase very big input；Much local power plant for self-supply load is unstable, and ature of coal level is uneven, does not possess automatization and puts into bar Part；It is crucial that the regulative mode of physical property can not change the ature of coal combustion position of boiler furnace internal chemical effectively.

Second scheme defect: although high phosphorus bearing slag serves combustion-supporting effect, ash can not be effectively increased, to carrying High boiler circulating ratio, increasing productivity do not act on, and increased boiler abrasion on the contrary, and side effect is very big.Some producers are also in root Copy flyash according to my company's scheme and return burner hearth, but do not control boiler to enter coal and return grey proportioning, can not effectively coordinate stove Interior fired coal combustion, and return grey non-quantitative and control, combustion efficiency is all undesirable, and result is that dismounting equipment has recovered original state.

Although boiler combustion system automatization decreases and runs the working strength of workman, becoming more meticulous have adjusted the method for operation, But from substantially can not effectively change disadvantages mentioned above, boiler energy-saving is not had with effective effect.

In addition, existing ash bucket can not play the effect of initial gross separation slag, also lacking in whole energy-saving and emission-reduction system must The dust arrester wanted, easily causes pollution.

Utility model content

In order to solve the deficiency in above-mentioned technical problem, the purpose of this utility model is: provides a kind of recirculating fluidized bed Boiler fly ash blood circulation, intelligence degree is higher, can play the effect of energy-saving and emission-reduction.

The technical scheme that this utility model is adopted by its technical problem of solution is:

Described CFBB flying dust blood circulation, including control device and circulating device；

Circulating device includes ash bucket, and the lower end one side of ash bucket is connected to reject bin, on the other hand by ash conveying pipe even Then ash silo, the upper end setting dust pelletizing system of ash silo, dust pelletizing system is connected with reject bin, and the lower end of ash silo is passed through to be connected to supply Glassware, loader is connected to burner hearth by ash inlet tube road, and one end of described loader is also connected with blower fan；

Control device includes switch board and dcs, and be electrically connected with dcs material transfer valve, electromagnetic valve, level-sensing device and Back-flushing valve, described material transfer valve is separately positioned on ash conveying pipe and the pipeline of ash silo upper end, and electromagnetic valve is arranged on ash inlet tube On road, level-sensing device is arranged on the side of ash silo, and back-flushing valve is arranged on the lower end of ash silo；

Described ash bucket includes housing, and the downside of inner walls is provided with top board, the upper end of top board be respectively provided with primary filter screen and Finer mesh；

Described dust pelletizing system includes cyclone dust extractor, and the lower end of cyclone dust extractor arranges the first unloading valve, cyclone dust extractor Depurator is connected to by connecting line, connecting line inserts the inside of purifier shell, the right-hand member of connecting line arranges blast cap, Upper end setting injection system within depurator, the side setting gas outlet of depurator upper end, the lower end setting second of depurator Unloading valve.

Further preferably, primary filter screen and finer mesh are attached by the connecting shaft at middle part, and the upper end of connecting shaft sets There is link, the upper end of finer mesh is provided with change, and change is socketed in the outside of connecting shaft.

Further preferably, primary filter screen and finer mesh are in funnel-form.

Further preferably, injection system includes being blown pipeline, and the lower end of injection pipeline arranges multiple injection mouths.

Compared with prior art, this utility model has the advantages that

1st, after fluidized-bed combustion boiler installs this energy conserving system, boiler bed temperature is decreased obviously, boiler export temperature, high-pressure superheater Temperature substantially rises, and boiler internal combustion position is clearly better.By accurately comparing calculating, using saving coals from boiler rate after the present invention Guard and reach more than 2%, what effect was good can reach 3-5%；

2nd, in addition to effect of coal saving, the system is also reduced the effect of environmental pollution；One is that coal quantity of boiler reduces, pollution Thing reduces therewith；Two is the desulfurized effect that improve desulfuration in furnace agent, saves desulphurization cost；

3rd, system operation is safe and reliable, easy to maintenance；

4th, the system meets environmental requirement, will not produce secondary pollution；

5th, the system small investment, instant effect, high through Exact calculation return rate；

6th, the system economical rationality, the expense once invested and run is low, comprehensive benefit is high；

7th, can play the effect of initial gross separation, slag is carried out separating；

8th, dust pelletizing system can play preferable dust removing effects, is conducive to environmental protection, prevents secondary pollution.

Brief description

Fig. 1 this utility model structural representation；

Fig. 2 this utility model ash bucket structural representation；

Fig. 3 this utility model dust pelletizing system structural representation.

In figure: 1, ash bucket；2nd, ash conveying pipe；3rd, material transfer valve；4th, level-sensing device；5、dcs；6th, switch board；7th, blower fan；8、 Loader；9th, back-flushing valve；10th, electromagnetic valve；11st, reject bin；12nd, dust pelletizing system；13rd, burner hearth；14th, housing；15th, primary filter screen； 16th, pressure transducer；17th, top board；18th, finer mesh；19th, link；20th, cyclone dust extractor；21st, connecting line；22nd, purify Device；23rd, gas outlet；24th, it is blown pipeline；25th, it is blown mouth；26th, the second unloading valve；27th, the first unloading valve.

Specific embodiment

Below in conjunction with the accompanying drawings this utility model embodiment is described further:

As Figure 1-3, CFBB flying dust blood circulation described in the utility model, including control device and following Loop device；

Circulating device includes ash bucket 1, and the lower end one side of ash bucket 1 is connected to reject bin 11, on the other hand passes through ash pipeline Road 2 is connected to ash silo, and the outside of ash silo is provided with heat-insulation layer, between heat-insulation layer and ash silo housing 14 add heat-preservation cotton, ash silo upper End setting dust pelletizing system 12, dust pelletizing system 12 is connected with reject bin 11, and the lower end of ash silo is by being connected to loader 8, feed Device 8 is connected to burner hearth 13 by ash inlet tube road, and one end of described loader 8 is also connected with blower fan 7, and coal ash is appropriate through loader 8 Entrance gas-solid mixing accelerating chamber, the compressed air then being produced by blower fan 7 passes through ash inlet tube road overfiren air port under boiler Place enters burning in burner hearth 13；

In addition, enter to draw a pipeline at fire door in ash inlet tube road being connected with secondary air channel, in pipeline, a butterfly valve is installed, During system operation, butterfly valve cuts out, and when system is stopped using, can open butterfly valve, the feeding secondary wind into burner hearth 13；

Control device includes switch board 6 and dcs5, and the material transfer valve 3 with dcs5 electric connection, electromagnetic valve 10, material Position meter 4 and back-flushing valve 9, described material transfer valve 3 is separately positioned on ash conveying pipe 2 and the pipeline of ash silo upper end, electromagnetic valve 10 It is arranged on ash inlet tube road, level-sensing device 4 is arranged on the side of ash silo, back-flushing valve 9 is arranged on the lower end of ash silo；Dcs5 passes through boiler The change of burner hearth 13 differential pressure, to realize back ash quantity regulation, makes to come back to the participation burning of the ash appropriateness of burner hearth 13；Meanwhile, dcs5 Remote control can be realized to each valve, blower fan 7 and loader 8.

Described ash bucket 1 includes housing 14, and the downside of housing 14 inwall is provided with top board 17, and the upper end of top board 17 is respectively provided with just Level filter screen 15 and finer mesh 18, primary filter screen 15 is tentatively filtered to slag, leaches sub-standard, finer mesh 18 Carry out finer filtration；

Described dust pelletizing system 12 includes cyclone dust extractor 20, and the lower end of cyclone dust extractor 20 arranges the first unloading valve 27, rotation Wind cleaner unit 20 is connected to depurator 22 by connecting line 21, and connecting line 21 inserts the inside of depurator 22 housing 14, even The right-hand member setting blast cap on adapter road 21, blast cap is fixed on connecting line 21 by brace rod, and the upper end within depurator 22 sets Put injection system, the side setting gas outlet 23 of depurator 22 upper end, the lower end of depurator 22 arranges the second unloading valve 26.

Primary filter screen 15 and finer mesh 18 are attached by the connecting shaft at middle part, and the upper end of connecting shaft is provided with link 19, the upper end of finer mesh 18 is provided with change, and change is socketed in the outside of connecting shaft, primary filter screen 15, finer mesh 18 and top Between plate 17, pressure transducer 16 is set, when pressure value reaches setting value, is reported to the police, now can catch on extension using crane Ring 19, primary filter screen 15 and finer mesh 18 are triggered, and slag is discharged from the bottom of housing 14.

Primary filter screen 15 and finer mesh 18 are in funnel-form, and filter screen tilts horizontal by 30-60 degree, and filter effect is relatively Good, also filter screen will not be damaged.

Injection system includes being blown pipeline 24, lower end setting multiple injection mouth 25 of injection pipeline 24, and injection mouth 25 passes through On injection pipeline 24, angle can be adjusted hinge.

Claims (4)

1. a kind of CFBB flying dust blood circulation, including control device and circulating device it is characterised in that

Circulating device includes ash bucket (1), and the lower end one side of ash bucket (1) is connected to reject bin (11), on the other hand passes through defeated ash Pipeline (2) is connected to ash silo, upper end setting dust pelletizing system (12) of ash silo, and dust pelletizing system (12) is connected with reject bin (11), The lower end of ash silo is connected to burner hearth (13), described loader by being connected to loader (8), loader (8) by ash inlet tube road (8) one end is also connected with blower fan (7)；

Control device includes switch board (6) and dcs (5), and be electrically connected with dcs (5) material transfer valve (3), electromagnetic valve (10), level-sensing device (4) and back-flushing valve (9), described material transfer valve (3) is separately positioned on ash conveying pipe (2) and ash silo upper end On pipeline, electromagnetic valve (10) is arranged on ash inlet tube road, and level-sensing device (4) is arranged on the side of ash silo, and back-flushing valve (9) is arranged on ash The lower end in storehouse；

Described ash bucket (1) includes housing (14), and the downside of housing (14) inwall is provided with top board (17), and the upper end of top board (17) is respectively The primary filter screen (15) of setting and finer mesh (18)；

Described dust pelletizing system (12) includes cyclone dust extractor (20), and the lower end of cyclone dust extractor (20) arranges the first unloading valve (27), cyclone dust extractor (20) is connected to depurator (22) by connecting line (21), and connecting line (21) inserts depurator (22) inside of housing (14), the right-hand member setting blast cap of connecting line (21), the internal upper end setting injection system of depurator (22) System, the side setting gas outlet (23) of depurator (22) upper end, the lower end of depurator (22) arranges the second unloading valve (26).

2. CFBB flying dust blood circulation according to claim 1 it is characterised in that primary filter screen (15) and Finer mesh (18) is attached by the connecting shaft at middle part, and the upper end of connecting shaft is provided with link (19), finer mesh (18) Upper end is provided with change, and change is socketed in the outside of connecting shaft.

3. CFBB flying dust blood circulation according to claim 1 it is characterised in that primary filter screen (15) and Finer mesh (18) is in funnel-form.

4. CFBB flying dust blood circulation according to claim 1 is it is characterised in that injection system includes spraying Blowpipe road (24), lower end setting multiple injection mouth (25) of injection pipeline (24).