CN205402696U - Circulating fluidized bed unit - Google Patents
Circulating fluidized bed unit Download PDFInfo
- Publication number
- CN205402696U CN205402696U CN201620257250.8U CN201620257250U CN205402696U CN 205402696 U CN205402696 U CN 205402696U CN 201620257250 U CN201620257250 U CN 201620257250U CN 205402696 U CN205402696 U CN 205402696U
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- Prior art keywords
- storehouse pump
- ash
- valve
- properties
- air
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- 239000002956 ash Substances 0.000 claims abstract description 41
- 239000000428 dust Substances 0.000 claims abstract description 25
- 239000010881 fly ash Substances 0.000 claims abstract description 4
- 238000005243 fluidization Methods 0.000 claims description 25
- 210000003437 trachea Anatomy 0.000 claims description 8
- 239000010882 bottom ash Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000007664 blowing Methods 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 230000008021 deposition Effects 0.000 abstract 1
- 230000009466 transformation Effects 0.000 description 7
- 230000007423 decrease Effects 0.000 description 6
- 239000003245 coal Substances 0.000 description 5
- 238000013517 stratification Methods 0.000 description 5
- 238000005273 aeration Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 239000002802 bituminous coal Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000003077 lignite Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 210000000056 organ Anatomy 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 238000006424 Flood reaction Methods 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001717 pathogenic effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
Landscapes
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The utility model discloses a circulating fluidized bed unit, including air heater and storehouse pump (2), this storehouse pump is including feed valve (21) of connecting inlet pipe (3), bleeder valve (22) of connecting ash pipeline (4) and the admission valve of connecting intake pipe (5), and inlet pipe and air heater's afterbody flue intercommunication is with the collection flying dust, the intake -tube connection air supply, and the ash pipeline is with fly ash conveying grey storehouse extremely. Add afterbody ash conveying system in this circulating fluidized bed unit's air heater's the afterbody flue, this afterbody ash conveying system passes through the storehouse pump and collects the flying dust to ash pipeline transport to grey storehouse is passed through with the air conveying mode with the flying dust to admitting air of intake pipe through connecting the air supply. During the air supply can come from the female pipe of boiler residual air or other gas transmissions, add -on system cost not, after can in time cleaing away the deposition of afterbody flue, the utility of heat exchange tube is more obvious to reduce exhaust gas temperature, equally also avoided blowing out frequently to overhaul, reduce the maintenance work volume.
Description
Technical field
This utility model belongs to recirculating fluidized bed field.
Background technology
In thermal power plant, the air preheater of Properties of CFB is after ash has been blown in per tour, and the dust stratification of the top heating surface of its back-end ductwork will be blown to back-end ductwork bottom.Flying dust is more long-pending more thick, eventually " floods " heat exchanger tube of air preheater, makes the heat exchange efficiency of air preheater reduce.After blowing out checks, it is easy to finding that the back-end ductwork dust stratification of air preheater is serious, the outlet pathogenic wind-warm of air preheater is on the low side compared with design load and exhaust gas temperature is higher.
Therefore, it is necessary in time by the defeated sky of dust stratification of the back-end ductwork of air preheater, keep air preheat organ pipe cleaning, improve air preheater heat exchange efficiency, reduce exhaust gas temperature, improve boiler efficiency.
Utility model content
The purpose of this utility model is to provide a kind of Properties of CFB, the back-end ductwork of its air preheater can ash disposal in time, to improve boiler efficiency.
For achieving the above object, this utility model provides a kind of Properties of CFB, described Properties of CFB includes air preheater and storehouse pump, this storehouse pump includes connecting the inlet valve of feed pipe, connecting the outlet valve of ash pipeline and connect the intake valve of air inlet pipe, described feed pipe connects to collect flying dust with the back-end ductwork of described air preheater, described air inlet pipe connects source of the gas, and described ash pipeline is by described fly ash carry to ash storehouse.
Preferably, described storehouse pump is arranged in the lower section of the ash bucket bottom described air preheater.
Preferably, the connection pipeline between described storehouse pump and described bottom ash bucket is provided with balanced valve.
Preferably, the top of described storehouse pump is provided with cleaner unit, and the flying dust of this cleaner unit trapping falls into the bottom of described storehouse pump.
Preferably, the bottom of described storehouse pump is provided with fluidisation cone, and described intake valve includes fluidisation intake valve, enters the fluidizing gas in the pump of described storehouse via described fluidisation intake valve and flows in described fluidisation cone to fluidize flying dust.
Preferably, it is provided with pressure transducer, this pressure transducer and described outlet valve coordinated signals so that when the air pressure in the pump of described storehouse is increased to setting air pressure in the pump of described storehouse, described pressure transducer sends opening signal and opens described outlet valve, and the described flying dust of fluidisation state flows through the output of described ash pipeline.
Preferably, described intake valve also includes QI invigorating intake valve, enters the QI invigorating gas in the pump of described storehouse via described QI invigorating intake valve and flows in described ash pipeline.
Preferably, described air inlet pipe also includes being connected to helping of described ash pipeline and blows into trachea, and this helps to blow into be provided with in trachea to help and blows valve.
Preferably, described storehouse pump is multiple, is equipped with type metal expansion joint in the connection pipeline connected between pipeline and described storehouse pump and described back-end ductwork between the pump of storehouse described in any two.
Preferably, described ash pipeline is additionally provided with block clearing air valve.
According in Properties of CFB of the present utility model, the back-end ductwork of its air preheater is additionally arranged afterbody ash-transmission system, this afterbody ash-transmission system collects flying dust by storehouse pump, and with pneumatic conveying mode, by ash pipeline, flying dust is delivered to ash storehouse by connecting the air inlet of the air inlet pipe of source of the gas.Source of the gas may be from, in boiler residual air or other gas transmission mother's pipe, not increasing system cost, after the dust stratification being removed back-end ductwork in time, the effectiveness of heat exchanger tube becomes apparent from, so that exhaust gas temperature is greatly reduced, it also avoid shutdown maintenance frequently equally, reduce maintenance workload.
Other features and advantages of the utility model will be described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to offer and is further appreciated by of the present utility model, and constitutes a part for description, is used for explaining this utility model, but is not intended that restriction of the present utility model together with detailed description below.In the accompanying drawings:
Fig. 1 is the schematic diagram of the afterbody ash-transmission system of the Properties of CFB according to preferred implementation of the present utility model.
Description of reference numerals
1 ash bucket 2 storehouse pump
3 feed pipe 4 ash pipelines
5 air inlet pipe 6 help and blow into trachea
21 inlet valve 22 outlet valves
23 fluidisation intake valve 24 QI invigorating intake valves
25 balanced valves 61 help and blow valve
Detailed description of the invention
Below in conjunction with accompanying drawing, detailed description of the invention of the present utility model is described in detail.It should be appreciated that detailed description of the invention described herein is merely to illustrate and explains this utility model, it is not limited to this utility model.
In this utility model, when not making contrary explanation, the noun of locality of use as " upper and lower " usually for direction shown in the drawings or for each parts mutual alignment relationship description word on vertical, vertical or gravity direction.
The air conveying important step being cleaning and producing, it is a kind of technical process replacing traditional machinery conveying material with sealed conveyance conduit, is a kind of modern logistics systems being suitable for Bulk material.The source of the gas that boiler produces is sufficient, therefore utilizing pneumatic transporting to send cleaning back-end ductwork here on the trend is a kind of feasible program, can by defeated for the dust stratification of the back-end ductwork of air preheater sky, keep air preheat organ pipe cleaning, improve air preheater heat exchange efficiency, reduce exhaust gas temperature, thus improving boiler efficiency.
Thus, as shown in Figure 1, the Properties of CFB that this utility model provides includes air preheater and storehouse pump 2, this storehouse pump 2 includes connecting the inlet valve 21 of feed pipe 3, connecting the outlet valve 22 of ash pipeline 4 and connect the intake valve of air inlet pipe 5, feed pipe 3 connects to collect flying dust with the back-end ductwork of air preheater, air inlet pipe 5 connects source of the gas, and ash pipeline 4 is by fly ash carry to ash storehouse.Wherein, conveying source of the gas may be from the defeated ash female pipe of conveying of electric precipitation etc. of correspondence.Each valve can realize automatically controlling, and instrument gas may be from fuel oil plane-table gas mother pipe.
In this afterbody ash-transmission system, storehouse pump 2 is arranged in the lower section of the ash bucket 1 bottom air preheater, storehouse pump 2 can be selected for the storehouse pump of routine, its top is provided with cleaner unit (not shown), flying dust in this cleaner unit trapping ash bucket 1, the flying dust mat free gravity of trapping or fall into the bottom of storehouse pump 2 through unloader.Connection pipeline between storehouse pump 2 and bottom ash bucket 1 also can be provided with balanced valve 25, to balance pressure.
Generally, the bottom of storehouse pump 2 is additionally provided with fluidisation cone, and intake valve includes fluidisation intake valve 23, enters the fluidizing gas in storehouse pump 2 via fluidisation intake valve 23 and can flow in fluidisation cone to fluidize flying dust.Meanwhile, being provided with pressure transducer in storehouse pump 2, this pressure transducer and outlet valve 22 coordinated signals so that when the air pressure in storehouse pump 2 is increased to setting air pressure, pressure transducer sends opening signal and opens outlet valve 22, and the flying dust of fluidisation state flows through ash pipeline 4 and exports.After charging completes, system can automatically open up fluidisation intake valve 23 (or claiming an intake valve), treated compression air can enter the fluidisation cone bottom the pump of storehouse through flow control valve (not shown), makes air uniformly be enclosed in around each flying dust after fluidisation cone.In the pump of storehouse, pressure raises simultaneously, and when pressure height is to when making pressure transducer send opening signal, system can automatically open up outlet valve 22, thus completing pressurization fluidization period.
For make-up gas to promote conveying air pressure, intake valve also includes QI invigorating intake valve 24, and the QI invigorating gas entered in storehouse pump 2 via QI invigorating intake valve 24 can flow directly in ash pipeline 4.It addition, air inlet pipe 5 may also include and is connected directly to helping of ash pipeline 4 and blows into trachea 6, this helps to blow into be provided with in trachea 6 to help and blows valve 61.Ash pipeline 4 is generally additionally provided with block clearing air valve.When block clearing air valve and helping blow valve 61 open, bigger discharge pressure can be tackled.
In the illustrated embodiment, have employed the form of storehouse pump group.Afterbody ash-transmission system two supply units of configuration, are formed a supply unit by the storehouse pump 2 that two capacity are 1.5 cubic metres, and front and back are arranged, are respectively designated as tail one district, tail two district.The connection pipeline connected between pipeline and storehouse pump 2 and back-end ductwork between two storehouse pumps 2 of same district all can be provided with type metal expansion joint, be beneficial to absorb swell increment.
The work process of afterbody ash-transmission system can be divided into three phases, namely charging stage → aeration phase → delivery phase.
1, the charging stage
The balanced valve 25 of storehouse pump 2 is opened, and time delay is opened the inlet valve 21 in inlet valve 21, figure and included the valve group of hand-operated valve and pneumatic operated valve after 3 seconds.While inlet valve 21 is opened, when can start feed charging meter by timer, timing is shown on system host computer, and scalable.During when feed charging meter, if certain storehouse pump level-sensing device of supply unit sends the full alarm signal of material, then can closing all inlet valves 21 of this supply unit, balanced valve 25, all storehouses pump of this supply unit all completes fill process, and the charging stage terminates.Or, when charging timing time arrives, close the inlet valve 21 of storehouse pump of supply unit, balanced valve 25, the charging stage of supply unit terminates.Following aeration phase is then entered after the charging stage of supply unit terminates.
2, aeration phase
Open the fluidisation intake valve 23 of the storehouse pump 2 of supply unit, QI invigorating intake valve 24 (being commonly called as three air valves), when starting simultaneously at aerated wort.When inflation timing time arrives, aeration phase terminates.Now the fluidisation intake valve 23 of supply unit, QI invigorating intake valve 24 continue to be held open state, and supply unit enters delivery phase.
3, delivery phase
Opening the outlet valve 22 of storehouse pump 2 in supply unit, start simultaneously at delivery phase timing, gas ash mixture is transported to ash storehouse by ash pipeline 4.In course of conveying, when discharge pressure is more than discharge pressure upper limit set value (such as 0.22MPa), opens to help and blow into helping of trachea 6 and blow valve 61；When discharge pressure is more than discharge pressure ultimate value setting value (such as 0.26MPa), block clearing air valve (not shown) can be opened, close the fluidisation intake valve 23 of supply unit；When discharge pressure drops to discharge pressure lower limit setting value (such as 0.18MPa, visual on host computer, adjustable), reopen the fluidisation intake valve 23 in supply unit, close to help and blow valve 61, block clearing air valve.Pressure (on host computer visual, adjustable) is terminated or delivery phase timing time arrives when pipeline discharge pressure drops to the conveying of setting, then delivery phase terminates, fluidisation intake valve 23, QI invigorating intake valve 24 in supply unit continue to be held open state, and supply unit enters the blowing pipeline stage.
Embodiment
The Properties of CFB of boiler is carried out Coal rank different load exhaust gas temperature contrast before and after the defeated ash transformation of above-mentioned back-end ductwork.
Table 1: boiler uses the contrast of anthracitic exhaust gas temperature
| Load (MW) | 300 | 240 | 180 |
| Before transformation | 146 | 139 | 123.5 |
| After transformation | 137.5 | 130.5 | 117.5 |
| Contrast | -8.5 | -8.5 | -6 |
Visible, when boiler uses anthracite, exhaust gas temperature declines 6～8.5 DEG C.Consumption of standard coal for power generation decline 1～1.43g/kWh is affected according to power consumption analysis.
Table 2: boiler uses temperature comparisons during bituminous coal smoke evacuation
| Load (MW) | 300 | 240 | 180 |
| Before transformation | 151 | 141 | 128.5 |
| After transformation | 125.5 | 113.5 | 108.5 |
| Contrast | -25.5 | -27.5 | -19.5 |
Visible, when boiler uses bituminous coal smoke evacuation, temperature declines 19.5～27.5 DEG C.Consumption of standard coal for power generation decline 3.36～4.62g/kWh is affected according to power consumption analysis.
Table 3: boiler uses the contrast of brown coal exhaust gas temperature
| Load (MW) | 300 | 240 | 180 |
| Before transformation | 149.5 | 136 | 117 |
| After transformation | 124 | 112 | 107 |
| Contrast | -25.5 | -24 | -10 |
Visible, boiler uses brown coal exhaust gas temperature and declines 10～25.5 DEG C.Consumption of standard coal for power generation decline 1.68～4.28g/kWh is affected according to power consumption analysis.
To sum up, by setting up above-mentioned afterbody ash-transmission system, exhaust gas temperature can be made to decline to a great extent.Through the improved the highest decline of smoke evacuation degree 27.5 DEG C, the highest decline 4.62g/kWh of consumption of standard coal for power generation.
Preferred implementation of the present utility model is described in detail above in association with accompanying drawing; but; this utility model is not limited to the detail in above-mentioned embodiment; in technology concept of the present utility model; the technical solution of the utility model can being carried out multiple simple variant, these simple variant belong to protection domain of the present utility model.
It is further to note that, each concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, it is possible to be combined by any suitable mode, in order to avoid unnecessary repetition, various possible compound modes are no longer illustrated by this utility model separately.
Additionally, can also carry out combination in any between various different embodiment of the present utility model, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.
Claims (10)
1. a Properties of CFB, it is characterized in that, described Properties of CFB includes air preheater and storehouse pump (2), this storehouse pump (2) includes connecting the inlet valve (21) of feed pipe (3), connecting the outlet valve (22) of ash pipeline (4) and connect the intake valve of air inlet pipe (5), described feed pipe (3) connects to collect flying dust with the back-end ductwork of described air preheater, described air inlet pipe (5) connects source of the gas, and described ash pipeline (4) is by described fly ash carry to ash storehouse.
2. Properties of CFB according to claim 1, it is characterised in that described storehouse pump (2) is arranged in the lower section of the ash bucket (1) bottom described air preheater.
3. Properties of CFB according to claim 2, it is characterised in that be provided with balanced valve (25) in the connection pipeline between described storehouse pump (2) and described bottom ash bucket (1).
4. Properties of CFB according to claim 2, it is characterised in that the top in described storehouse pump (2) is provided with cleaner unit, the flying dust of this cleaner unit trapping falls into the bottom in described storehouse pump (2).
5. Properties of CFB according to claim 4, it is characterized in that, the bottom in described storehouse pump (2) is provided with fluidisation cone, described intake valve includes fluidisation intake valve (23), enters the fluidizing gas in described storehouse pump (2) via described fluidisation intake valve (23) and flows in described fluidisation cone to fluidize flying dust.
6. Properties of CFB according to claim 5, it is characterized in that, it is provided with pressure transducer in described storehouse pump (2), this pressure transducer and described outlet valve (22) coordinated signals, when making the air pressure in described storehouse pump (2) be increased to setting air pressure, described pressure transducer sends opening signal and opens described outlet valve (22), and the described flying dust of fluidisation state flows through described ash pipeline (4) output.
7. Properties of CFB according to claim 5, it is characterized in that, described intake valve also includes QI invigorating intake valve (24), enters the QI invigorating gas in described storehouse pump (2) via described QI invigorating intake valve (24) and flows in described ash pipeline (4).
8. Properties of CFB according to claim 1, it is characterized in that, described air inlet pipe (5) also includes being connected to helping of described ash pipeline (4) and blows into trachea (6), and this helps to blow into be provided with in trachea (6) to help and blows valve (61).
9. Properties of CFB according to claim 1, it is characterized in that, described storehouse pump (2), for multiple, is equipped with type metal expansion joint in the connection pipeline between connection pipeline and described storehouse pump (2) and described back-end ductwork between storehouse pump (2) described in any two.
10. Properties of CFB according to claim 1, it is characterised in that described ash pipeline is additionally provided with block clearing air valve in (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620257250.8U CN205402696U (en) | 2016-03-30 | 2016-03-30 | Circulating fluidized bed unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620257250.8U CN205402696U (en) | 2016-03-30 | 2016-03-30 | Circulating fluidized bed unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205402696U true CN205402696U (en) | 2016-07-27 |
Family
ID=56419458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620257250.8U Active CN205402696U (en) | 2016-03-30 | 2016-03-30 | Circulating fluidized bed unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205402696U (en) |
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2016
- 2016-03-30 CN CN201620257250.8U patent/CN205402696U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |