CN115289462A - Adjusting structure of circulating flow rate of circulating fluidized bed boiler - Google Patents
Adjusting structure of circulating flow rate of circulating fluidized bed boiler Download PDFInfo
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- CN115289462A CN115289462A CN202210877371.2A CN202210877371A CN115289462A CN 115289462 A CN115289462 A CN 115289462A CN 202210877371 A CN202210877371 A CN 202210877371A CN 115289462 A CN115289462 A CN 115289462A
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- bed boiler
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- 238000009423 ventilation Methods 0.000 claims description 77
- 238000001816 cooling Methods 0.000 claims description 7
- 238000000605 extraction Methods 0.000 claims description 7
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000004044 response Effects 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 description 11
- 239000002245 particle Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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- 229910052799 carbon Inorganic materials 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
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- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/24—Devices for removal of material from the bed
- F23C10/26—Devices for removal of material from the bed combined with devices for partial reintroduction of material into the bed, e.g. after separation of agglomerated parts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2206/00—Fluidised bed combustion
- F23C2206/10—Circulating fluidised bed
- F23C2206/102—Control of recirculation rate
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention discloses a circulating flow rate adjusting structure of a circulating fluidized bed boiler, which comprises a cyclone separator, a vent pipe and an air inlet and exhaust assembly. The ventilating pipe penetrates through the side wall of the dipleg of the cyclone separator, one end of the ventilating pipe is positioned at the upper end inside the dipleg and is provided with a ventilating opening, and the other end of the ventilating pipe is positioned outside the dipleg; the air inlet and exhaust assembly is connected with the other end of the ventilating pipe and used for introducing air to the inner upper end of the dipleg through the ventilating pipe so as to increase the pressure at the inner upper end of the dipleg and exhausting air from the inner upper end of the dipleg through the ventilating pipe so as to reduce the pressure at the inner upper end of the dipleg. The invention can adjust the circulating flow rate of the circulating fluidized bed boiler, has fast response speed, is easy to adjust and is simple to operate.
Description
Technical Field
The invention relates to the technical field of circulating fluidized bed boilers, in particular to a circulating flow rate adjusting structure of a circulating fluidized bed boiler.
Background
In order to deal with the 'double carbon' target, the power system in China faces transformation. The circulating fluidized bed boiler also plays an important role in a novel power system due to the advantages of wide fuel, low pollution emission, low-load stable operation and the like. The method releases the deep peak shaving potential and improves the operation flexibility, thereby being an important direction for the development of the circulating fluidized bed boiler unit.
The key of the load regulation of the circulating fluidized bed boiler lies in the regulation of the circulating flow rate, and in order to increase the load regulation rate of the circulating fluidized bed boiler, the regulation rate of the circulating flow rate needs to be increased on the premise of ensuring the stable and safe operation of the boiler. However, the circulating fluidized bed boiler has low capability of adapting to rapid load change due to the technical characteristics thereof, and has large improvement space. As an important component of the circulating fluidized bed boiler, the separation efficiency of the cyclone directly determines the amount of particles entering the dipleg, i.e. the magnitude of the circulation flow rate, and thus the circulation flow rate can be adjusted within a certain range by adjusting the separation efficiency of the cyclone.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a structure for adjusting the circulating flow rate of a circulating fluidized bed boiler, which can adjust the circulating flow rate of the circulating fluidized bed boiler and has the advantages of easy adjustment, fast response speed and simple operation.
The structure for adjusting the circulating flow rate of a circulating fluidized bed boiler according to an embodiment of the present invention includes:
a cyclone separator;
the ventilation pipe penetrates through the side wall of the dipleg of the cyclone separator, one end of the ventilation pipe is positioned at the upper end inside the dipleg and is provided with a ventilation opening, and the other end of the ventilation pipe is positioned outside the dipleg;
and the air inlet and air exhaust assembly is connected with the other end of the ventilating pipe and is used for introducing air to the upper inner end of the dipleg through the ventilating pipe so as to increase the pressure at the upper inner end of the dipleg and exhausting air from the upper inner end of the dipleg through the ventilating pipe so as to reduce the pressure at the upper inner end of the dipleg.
According to the adjusting structure of the circulating flow rate of the circulating fluidized bed boiler, the adjusting structure has the advantages that firstly, the circulating flow rate of the circulating fluidized bed boiler can be adjusted without carrying out complex change on the whole structure of the circulating fluidized bed boiler, and meanwhile, the normal operation of a hearth and a material returning system of the circulating fluidized bed boiler is not interfered, so that the adjusting structure is convenient to popularize and apply; secondly, the circulating flow rate can be flexibly adjusted according to the operation load required by the circulating fluidized bed boiler, so that the circulating fluidized bed boiler can cope with the operation conditions with different loads; thirdly, the separation efficiency of the cyclone separator can be adjusted by controlling the air inlet speed and the air exhaust speed of the ventilation pipe, so that the adjustment of the circulating flow rate of the circulating fluidized bed boiler can be quickly realized, the load changing speed in the operation of the circulating fluidized bed boiler is increased, the operation flexibility of the circulating fluidized bed boiler is increased, the deep peak shaving of a circulating fluidized bed unit is facilitated, and the cyclone separator is suitable for the reconstruction of a newly built unit and an existing unit; fourthly, the adjusting structure of the circulating flow rate of the circulating fluidized bed boiler is easy to adjust, simple to operate, longer in service life and small in interference to the combustion state in the boiler.
In some embodiments, the intake and exhaust assemblies include an intake bypass and an exhaust bypass; one end of the air inlet bypass is connected with the other end of the ventilation pipe and used for feeding air to the upper end inside the dipleg; one end of the air exhaust bypass is connected with the other end of the ventilating pipe and used for exhausting air from the upper end of the inside of the dipleg.
In some embodiments, the intake bypass comprises an intake duct and an air intake fan; one end of the air inlet pipe is connected with the other end of the ventilation pipe, the other end of the air inlet pipe is connected with the air inlet machine, the air inlet bypass further comprises an air inlet adjusting valve, and the air inlet adjusting valve is arranged on the air inlet pipe.
In some embodiments, the bleed bypass comprises a bleed tube and a bleed; one end of the air exhaust pipe is connected with the other end of the vent pipe, the other end of the air exhaust pipe is connected with the air extractor, the air exhaust bypass further comprises an air exhaust adjusting valve, the air exhaust adjusting valve is arranged on the air exhaust pipe, and the part of the vent pipe, which is located outside the dipleg, and the wall surface of the air exhaust pipe are heat insulation wall surfaces or water cooling wall surfaces.
In some embodiments, one end of the vent tube extends coaxially with the dipleg.
In some embodiments, the vent is directed upwards or downwards, or the vent is located on one end side wall of the vent tube; when the vent is upward, a hood is arranged above the vent.
In some embodiments, the vent is provided with a screen.
In some embodiments, the clearance between one end of the vent tube and the dipleg is 2 to 5 times the outer diameter of the vent tube.
In some embodiments, the vent tube includes an expansion joint located outside of and not in contact with the dipleg.
In some embodiments, the circulating fluidized bed boiler comprises one or more of the cyclones, each of which is fitted with the draft tube and the air intake and extraction assembly.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is an overall structural view of a circulating fluidized bed boiler circulation flow rate adjusting structure according to an embodiment of the present invention.
FIG. 2 is a front view of a circulating fluidized bed boiler circulation flow rate adjusting structure according to an embodiment of the present invention.
Fig. 3 is a bottom view of a circulating fluidized bed boiler circulation flow rate adjusting structure of an embodiment of the present invention with a lower seat removed.
Fig. 4 is a cross-sectional view with the vent facing upward.
Fig. 5 is a schematic view of a first structure of the vent opening in a side wall of one end of the vent tube.
Fig. 6 is a second structural view when the ventilation opening is positioned on the side wall of one end of the ventilation pipe.
Fig. 7 is a schematic structural diagram of a second connecting mechanism in the embodiment of the present invention.
Reference numerals:
adjusting structure 1000 for circulating flow rate of circulating fluidized bed boiler
Air intake and exhaust assembly 3
Bleed bypass 302 bleed line 3021 bleed regulator 3022 bleed regulator 3023
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.
The structure 1000 for adjusting the circulating flow rate of a circulating fluidized bed boiler according to the present invention will be described with reference to fig. 1 to 7.
As shown in fig. 1 to 7, the structure 1000 for adjusting the circulation flow rate of a circulating fluidized bed boiler according to an embodiment of the present invention includes a cyclone 1, a ventilation pipe 2 and an air intake and exhaust assembly 3, the ventilation pipe 2 penetrates through a sidewall of a dipleg 101 of the cyclone 1, one end of the ventilation pipe 2 is located at an inner upper end of the dipleg 101 and has a ventilation opening 203, and the other end of the ventilation pipe 2 is located outside the dipleg 101; an air inlet and extraction assembly 3 is connected to the other end of the ventilation tube 2 for introducing air through the ventilation tube 2 at the inner upper end of the dipleg 101 to increase the pressure at the inner upper end of the dipleg 101 and extracting air through the ventilation tube 2 from the inner upper end of the dipleg 101 to decrease the pressure at the inner upper end of the dipleg 101.
Specifically, the cyclone separator 1 comprises a dipleg 101, a conical section 102, a cylinder section 103 and an exhaust pipe 104 which are sequentially connected from bottom to top, wherein the lower end of the exhaust pipe 104 extends into the cylinder section 103, an inlet flue 105 is arranged at a position on the side wall of the cylinder section 103 close to the top end, and the wall surfaces of the conical section 102 and the cylinder section 103 can adopt heat insulation wall surfaces, water cooling wall surfaces or steam cooling wall surfaces so as to reduce heat loss.
A vent pipe 2 passes through the side wall of the dipleg 101 of the cyclone 1, one end of the vent pipe 2 is positioned at the inner upper end of the dipleg 101 and is provided with a vent opening 203, and the other end of the vent pipe 2 is positioned outside the dipleg 101. One end of the ventilation pipe 2 is located at the upper end of the inside of the dipleg 101, that is, one end of the ventilation pipe 2 is close to the lower outlet of the tapered section 102, it should be noted that the part of the ventilation pipe 2 located inside the dipleg 101 comprises a vertical pipe section 201 and a horizontal pipe section 202, the vertical pipe section 201 extends in the up-down direction, the ventilation opening 203 is arranged on the vertical pipe section 201, the lower end of the vertical pipe section 201 is fixedly connected with one end of the horizontal pipe section 202, and the horizontal pipe section 202 is fixed on the dipleg 101, in this way, when the ventilation pipe 2 admits air or the ventilation pipe 2 sucks air, the airflow direction near one end of the ventilation pipe 2 is in the approximately vertical direction or in the approximately vertical direction, so that the airflow near one end of the ventilation pipe 2 cannot be disturbed or the disturbance degree is very small, thereby being beneficial to prolonging the service life of the ventilation pipe 2 and the cyclone separator 1.
The air inlet and exhaust assembly 3 is connected with the other end of the ventilation pipe 2 and is used for introducing air to the upper end of the inside of the dipleg 101 through the ventilation pipe 2 to increase the pressure at the upper end of the inside of the dipleg 101, namely, the pressure near the lower outlet of the conical section 102 is increased, so that the airflow field at the bottom of the conical section 102 is disturbed, the separation efficiency of the cyclone separator 1 can be further reduced, and the amount of fly ash escaping from the exhaust pipe 104 is increased.
The pressure at the upper end inside the dipleg 101 is reduced by pumping air from the upper end inside the dipleg 101 through the ventilation pipe 2, namely, the pressure near the lower outlet of the conical section 102 is reduced, so that the airflow field at the bottom of the conical section 102 is more orderly, the separation efficiency of the cyclone separator 1 can be improved, and the amount of fly ash escaping from the exhaust pipe 104 is reduced.
In summary, according to the adjusting structure 1000 for the circulating fluidized bed boiler circulation flow rate of the embodiment of the invention, by providing the vent pipe 2 with one end located at the inner upper end of the dipleg 101 and having the vent opening 203, and the air intake and exhaust assembly 3 arranged outside the dipleg 101 and connected with the other end of the vent pipe 2, the airflow field at the bottom of the conical section 102 can be changed by air intake to the inner upper end of the dipleg 101 and air exhaust from the inner upper end of the dipleg 101, so that the separation efficiency of the cyclone separator 1 is changed, and further the circulating fluidized bed boiler circulation flow rate is adjusted.
According to the adjusting structure 1000 of the circulating flow rate of the circulating fluidized bed boiler, the adjusting structure has the advantages that firstly, the circulating flow rate of the circulating fluidized bed boiler can be adjusted without performing complex change on the whole structure of the circulating fluidized bed boiler, and meanwhile, the normal operation of a hearth and a material returning system of the circulating fluidized bed boiler is not interfered, so that the adjusting structure is convenient to popularize and apply; secondly, the circulating flow rate can be flexibly adjusted according to the operation load required by the circulating fluidized bed boiler, so that the circulating fluidized bed boiler can cope with the operation conditions with different loads; thirdly, the separation efficiency of the cyclone separator 1 can be adjusted by controlling the air inlet speed and the air exhaust speed of the vent pipe 2, so that the adjustment of the circulating flow rate of the circulating fluidized bed boiler can be quickly realized, the load changing speed in the operation of the circulating fluidized bed boiler is improved, the operation flexibility of the circulating fluidized bed boiler is increased, the deep peak shaving of a circulating fluidized bed unit is facilitated, and the cyclone separator is suitable for the reconstruction of a newly built unit and an existing unit; fourthly, the adjusting structure 1000 of the circulating flow rate of the circulating fluidized bed boiler is easy to adjust, simple to operate, longer in service life and small in interference to the combustion state in the boiler.
In some embodiments, as shown in fig. 1 and 2, the intake and extraction assembly 3 comprises an intake bypass 301 and an extraction bypass 302; one end of the air inlet bypass 301 is connected with the other end of the ventilation pipe 2 and is used for feeding air to the upper end inside the dipleg 101; one end of the suction bypass 302 is connected to the other end of the ventilation pipe 2 for sucking air from the inner upper end of the dipleg 101. That is, the air inlet bypass 301 and the air exhaust bypass 302 are separated independently, and when the load of the circulating fluidized bed boiler needs to be reduced and the circulating flow rate of the circulating fluidized bed boiler needs to be reduced, the air inlet bypass 301 is opened, the air inlet rate of the air inlet bypass 301 is increased, and the air exhaust bypass 302 is closed, so that the pressure near the lower outlet of the conical section 102 is increased, and the separation efficiency of the cyclone separator 1 is reduced; when the load of the circulating fluidized bed boiler needs to be increased and the circulating flow rate of the circulating fluidized bed boiler needs to be increased, the air intake speed of the air exhaust bypass 302 can be increased by opening the air exhaust bypass 302, and the air intake bypass 301 is closed, so that the pressure near the lower outlet of the conical section 102 is reduced, and the separation efficiency of the cyclone separator 1 is increased. The adoption of the independent and separate intake bypass 301 and bleed bypass 302 can make the response speed of the intake and bleed control faster, thereby being beneficial to improving the regulation rate of the circulation flow rate.
In some embodiments, the intake bypass 301 includes an intake duct 3011 and an intake fan 3012; one end of the air inlet pipe 3011 is connected to the other end of the ventilation pipe 2, and the other end of the air inlet pipe 3011 is connected to the air inlet machine 3012, so that the start and stop of air inlet can be controlled by controlling the opening and closing of the air inlet machine 3012, and the air inlet size can be adjusted by controlling the frequency of the air inlet machine 3012. Specifically, the air inlet 3012 may be an induced draft fan, and the induced draft fan here may be an induced draft fan in the original circulating fluidized bed boiler, so as to reduce the implementation cost of the present invention, and facilitate the popularization and implementation of the present invention.
In some embodiments, the intake bypass 301 further includes an intake adjusting valve 3013, and the intake adjusting valve 3013 is provided on the intake pipe 3011. It can be understood that the adjustment of the air intake rate of the air intake bypass 301 can be realized by adjusting the opening degree of the air intake adjusting valve 3013, when the opening degree of the air intake adjusting valve 3013 is increased, the pressure increase amplitude near the lower outlet of the conical section 102 is increased, so that the separation efficiency of the cyclone separator 1 is greatly reduced, and further, the adjustment of the circulating flow rate of the circulating fluidized bed boiler in operation within a certain range can be realized to cope with the operation conditions of different loads.
In some embodiments, the bleed bypass 302 includes a bleed duct 3021 and a bleed 3022; one end of the exhaust pipe 3021 is connected to the other end of the ventilation pipe 2, and the other end of the exhaust pipe 3021 is connected to the air exhauster 3022, so that the start and stop of air exhaust can be controlled by controlling the opening and closing of the air exhauster 3022, and the air exhaust rate can be adjusted by controlling the frequency of the air exhauster 3022. Specifically, the air extractor 3022 may be a roots blower, and the roots blower therein may be a roots blower in the original circulating fluidized bed boiler, so as to reduce the implementation cost of the present invention, and facilitate the popularization and implementation of the present invention.
In some embodiments, the bleed air bypass 302 further includes a bleed air regulator valve 3023, the bleed air regulator valve 3023 being disposed on the bleed air duct 3021. It can be understood that the adjustment of the air exhaust speed of the air exhaust bypass 302 can be realized by adjusting the opening degree of the air exhaust adjusting valve 3023, when the opening degree of the air exhaust adjusting valve 3023 is increased, the pressure reduction range near the lower outlet of the conical section 102 is increased, the separation efficiency of the cyclone separator 1 is greatly improved, and then the operation of the circulating fluidized bed boiler can be adjusted within a certain range to meet the operation conditions of different loads.
In some embodiments, the portion of the ventilation pipe 2 outside the dipleg 101 and the wall surface of the suction pipe 3021 are heat-insulating wall surfaces or water-cooling wall surfaces. The reason is that the temperature in the cyclone separator 1 is high, the ventilation pipe 2 is generally a metal pipe, and the heat conductivity is good, so that the temperature of the part of the ventilation pipe 2 outside the dipleg 101 is usually high, and the part of the ventilation pipe 2 outside the dipleg 101 is set to be a heat insulation wall surface or a water cooling wall surface, so that the heat loss can be reduced, and the site safety can be ensured; when the cyclone 1 is exhausted, the high-temperature gas in the cyclone 1 is exhausted through the exhaust pipe 3021, and thus the temperature of the exhaust pipe 3021 is high, so that the wall surface of the exhaust pipe 3021 is formed into a heat-insulating wall surface or a water-cooling wall surface, which can reduce heat loss and ensure safety in the field.
In some embodiments, one end of the vent tube 2 extends coaxially with the dipleg 101. That is to say, the extending direction of dipleg 101 is the upper and lower direction to the extending direction of the one end of ventilation pipe 2 is also the upper and lower direction, and the extending direction of the vertical pipe section 201 of ventilation pipe 2 is the upper and lower direction, and like this, when intaking to the vicinity of the lower outlet of conical section 102 or drawing air from the vicinity of the lower outlet of conical section 102 through ventilation pipe 2, can make the air current in the vicinity of one end of ventilation pipe 2 ordered and can not take place the disorder or the disorder degree is very low, thereby is favorable to improving the life of ventilation pipe 2 and cyclone 1. And the vertical pipe section 201 of the vent pipe 2 and the dipleg 101 are coaxially arranged, so that the vertical pipe section 201 of the vent pipe 2 can avoid a high-concentration particle area near the inner wall surface of the dipleg 101 as much as possible, the abrasion is reduced, and the service life of the vent pipe 2 is prolonged.
In some embodiments, the vent 203 is directed upward (as shown in fig. 1, 3, 4, and 7) or downward (as shown in fig. 2), or the vent 203 is located on one end sidewall of the vent 2 (as shown in fig. 5 and 6). That is to say, one end of the vertical pipe section 201 of the ventilation pipe 2 is designed to be open, and the opening faces upward or downward, or the vent opening 203 is located on the sidewall of the vertical pipe section 201, it can be understood that, when the vent opening 203 is located on the sidewall of the vertical pipe section 201, one vent opening 203 may be arranged on the sidewall of the vertical pipe section 201, or a plurality of vent openings 203 may also be arranged on the sidewall of the vertical pipe section 201, and when the vent opening 203 is located on the sidewall of the vertical pipe section 201, the diameter of the vent opening 203 may be set to be smaller, so that the air flow near one end of the ventilation pipe 2 is not subjected to larger impact during air intake or air exhaust, thereby the air flow near one end of the ventilation pipe 2 is not disturbed by a large area, and the service life of the ventilation pipe 2 and the cyclone separator 1 is ensured. When the vent 203 is located on the side wall of the riser section 201, one end of the vent tube 2 is closed.
In some embodiments, a hood 2031 is disposed above the vent 203 when the vent 203 is facing upward. As shown in fig. 7, the hood 2031 covers the upward ventilation opening 203, so that particles are prevented from directly falling into the ventilation pipe 2 and blocking the ventilation pipe 2.
In some embodiments, the vent 203 is provided with a screen (not shown). It will be appreciated that the screen may filter gas entering the vent tube 2, and may prevent larger particles from entering the vent tube 2, thereby preventing particles from blocking the vent tube 2.
In some embodiments, the gap between one end of the ventilation pipe 2 and the dipleg 101 is 2 to 5 times of the outer diameter of the ventilation pipe 2, that is, the gap between one end of the ventilation pipe 2 and the dipleg 101 may be 2 times, 3 times, 4 times, 5 times, etc. of the outer diameter of the ventilation pipe 2, so that the ventilation pipe 2 may well avoid a high-concentration particle area near the inner wall surface of the dipleg 101, reduce the wear of the ventilation pipe 2, and prolong the service life of the ventilation pipe 2.
In some embodiments, as shown in fig. 3, the vent tube 2 includes an expansion joint 204, the expansion joint 204 being located outside the dipleg 101 and not in contact with the dipleg 101. It can be understood that the expansion joint 204 is arranged to make the ventilation pipe 2 adapt to the deformation caused by the thermal expansion and contraction of the ventilation pipe 2 and the cyclone separator 1, and avoid the deformation and damage of the ventilation pipe 2. It will be appreciated that the expansion joint 204 is provided on the portion of the transverse section 202 that is outside the dipleg 101.
In some embodiments, the vent tube 2 is a heat-resistant stainless steel tube with a wall thickness of 8-20mm and a maximum withstand temperature of 1050 ℃, thereby ensuring normal use of the vent tube 2.
In some embodiments, the circulating fluidized bed boiler comprises one or more cyclones 1, each cyclone 1 is provided with a ventilation duct 2 and an air intake and exhaust assembly 3, and when the circulating fluidized bed boiler comprises a plurality of cyclones 1, the air intake and exhaust assemblies 3 of the plurality of cyclones 1 can be adjusted simultaneously, so that the circulating flow rate of the circulating fluidized bed boiler can be adjusted in a wider range. Wherein a plurality of cyclone separators 1 are connected in parallel with each other.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like are intended to mean that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A circulating flow rate adjusting structure of a circulating fluidized bed boiler, comprising:
a cyclone separator;
the ventilation pipe penetrates through the side wall of the dipleg of the cyclone separator, one end of the ventilation pipe is positioned at the upper end inside the dipleg and is provided with a ventilation opening, and the other end of the ventilation pipe is positioned outside the dipleg;
and the air inlet and exhaust assembly is connected with the other end of the ventilation pipe and is used for introducing air to the inner upper end of the dipleg through the ventilation pipe to increase the pressure at the inner upper end of the dipleg and exhausting air from the inner upper end of the dipleg through the ventilation pipe to reduce the pressure at the inner upper end of the dipleg.
2. The circulating fluidized bed boiler circulation flow rate adjusting structure according to claim 1, wherein the intake and extraction assembly includes an intake bypass and an extraction bypass; one end of the air inlet bypass is connected with the other end of the ventilation pipe and used for feeding air to the upper end inside the dipleg; one end of the air exhaust bypass is connected with the other end of the ventilating pipe and used for exhausting air from the upper end of the inside of the dipleg.
3. The circulating fluidized bed boiler circulation flow rate adjusting structure according to claim 2, wherein the intake bypass includes an intake duct and an intake fan; one end of the air inlet pipe is connected with the other end of the ventilation pipe, the other end of the air inlet pipe is connected with the air inlet machine, the air inlet bypass further comprises an air inlet adjusting valve, and the air inlet adjusting valve is arranged on the air inlet pipe.
4. The circulating fluidized bed boiler circulation flow rate adjusting structure according to claim 3, wherein the suction bypass includes a suction pipe and a suction machine; one end of the air exhaust pipe is connected with the other end of the ventilation pipe, the other end of the air exhaust pipe is connected with the air extractor, the air exhaust bypass further comprises an air exhaust adjusting valve, the air exhaust adjusting valve is arranged on the air exhaust pipe, and the part, outside the dipleg, of the ventilation pipe and the wall surface of the air exhaust pipe are heat insulation wall surfaces or water cooling wall surfaces.
5. The circulating fluidized bed boiler circulation flow rate adjusting structure according to any one of claims 1 to 4, wherein one end of the ventilating pipe extends coaxially with the dipleg.
6. The circulating fluidized bed boiler circulation flow rate adjusting structure according to claim 5, wherein the ventilation opening is directed upward or downward, or the ventilation opening is located on one end side wall of the ventilation duct; when the vent is upward, a hood is arranged above the vent.
7. The circulating fluidized bed boiler circulation flow rate adjusting structure according to claim 6, wherein the ventilation opening is provided with a strainer.
8. The circulating fluidized bed boiler circulation flow rate adjusting structure according to claim 5, wherein a gap between one end of the ventilating pipe and the dipleg is 2 to 5 times an outer diameter of the ventilating pipe.
9. The circulating fluidized bed boiler circulation flow rate adjusting structure according to any one of claims 1 to 4, wherein the draft tube includes an expansion joint that is located outside the dipleg and does not contact the dipleg.
10. The circulating fluidized bed boiler circulation flow rate adjusting structure according to any one of claims 1 to 4, wherein the circulating fluidized bed boiler includes one or more of the cyclones, each of which is equipped with the draft tube and the air intake and extraction assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210877371.2A CN115289462A (en) | 2022-07-25 | 2022-07-25 | Adjusting structure of circulating flow rate of circulating fluidized bed boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210877371.2A CN115289462A (en) | 2022-07-25 | 2022-07-25 | Adjusting structure of circulating flow rate of circulating fluidized bed boiler |
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| CN115289462A true CN115289462A (en) | 2022-11-04 |
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| CN202210877371.2A Pending CN115289462A (en) | 2022-07-25 | 2022-07-25 | Adjusting structure of circulating flow rate of circulating fluidized bed boiler |
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|---|---|
| CN (1) | CN115289462A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002286216A (en) * | 2001-03-28 | 2002-10-03 | Chugai Ro Co Ltd | Operation method for circulated fluidized bed |
| CN102353042A (en) * | 2011-09-09 | 2012-02-15 | 北京交通大学 | Adjusting method for circulating ash quantity, separator and combustion system |
| CN207815302U (en) * | 2017-12-20 | 2018-09-04 | 东莞理文造纸厂有限公司 | A kind of cycles, economized fluidized-bed combustion boiler |
| CN109746130A (en) * | 2019-03-23 | 2019-05-14 | 湖北华电襄阳发电有限公司 | Gasification of biomass recirculating fluidized bed whirlwind separator |
| CN112275458A (en) * | 2020-08-18 | 2021-01-29 | 华电电力科学研究院有限公司 | Axial flow combination reversal type cyclone separator is cut to efficiency adjustable |
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2022
- 2022-07-25 CN CN202210877371.2A patent/CN115289462A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002286216A (en) * | 2001-03-28 | 2002-10-03 | Chugai Ro Co Ltd | Operation method for circulated fluidized bed |
| CN102353042A (en) * | 2011-09-09 | 2012-02-15 | 北京交通大学 | Adjusting method for circulating ash quantity, separator and combustion system |
| CN207815302U (en) * | 2017-12-20 | 2018-09-04 | 东莞理文造纸厂有限公司 | A kind of cycles, economized fluidized-bed combustion boiler |
| CN109746130A (en) * | 2019-03-23 | 2019-05-14 | 湖北华电襄阳发电有限公司 | Gasification of biomass recirculating fluidized bed whirlwind separator |
| CN112275458A (en) * | 2020-08-18 | 2021-01-29 | 华电电力科学研究院有限公司 | Axial flow combination reversal type cyclone separator is cut to efficiency adjustable |
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