CN113108304B - Flue gas outlet device of air preheater and flue gas discharge method - Google Patents
Flue gas outlet device of air preheater and flue gas discharge method Download PDFInfo
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- CN113108304B CN113108304B CN202110588855.0A CN202110588855A CN113108304B CN 113108304 B CN113108304 B CN 113108304B CN 202110588855 A CN202110588855 A CN 202110588855A CN 113108304 B CN113108304 B CN 113108304B
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- flue gas
- flue
- dust
- air preheater
- gas outlet
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention relates to the technical field of boilers in the petrochemical industry, and provides a flue gas outlet device of an air preheater, which comprises a flue, wherein the flue comprises a flue gas input end, a flue gas output end and a flue gas dust collecting end, wherein the flue is connected with an air preheater main body; the connection part is communicated with the smoke input end, the smoke output end and the dust collecting end; the linking part is provided with a slope surface for colliding flue gas to subside dust, the flue gas dust collecting end is used for collecting the settled dust, the flue gas output end is used for outputting the flue gas after the dust is settled, the flue gas dust collecting end is arranged below the linking part, and the flue gas dust collecting end comprises a sedimentation ash bucket connected with the linking part and a closed ash discharging device connected with the sedimentation ash bucket. The invention effectively solves the problems of increased flue resistance, increased power consumption of the induced draft fan, increased exhaust gas temperature, reduced heat exchange effect of the air preheater and increased heat loss caused by dust deposition in the flue, recycles the dust, protects the environment and increases the benefit.
Description
Technical Field
The invention relates to the technical field of boilers in the petrochemical industry, in particular to a smoke outlet device of an air preheater and a smoke discharging method.
Background
In the petrochemical industry, a boiler device generally includes a boiler body, an air preheater, a dust collector, a chimney, a connecting flue assembly, and the like. The air preheater utilizes the waste heat of the boiler flue gas to heat the air required by the combustion of the boiler, and the high-temperature flue gas exchanges heat with combustion air in the air preheater main body, is discharged through a flue gas outlet device at the tail part of the air preheater main body, sequentially enters an external flue, a dust remover and a chimney, and is exhausted.
The flue gas outlet at the tail part of the existing air preheater is generally simply arranged into a horizontal flue for connecting with an external flue, and the external flue is also often arranged into a horizontal flue, an inclined flue or a climbing flue due to the arrangement of equipment. In the actual long-period production and operation process, dust in flue gas is continuously settled on a horizontal flue, and a large amount of dust and scale which are cleared off from the outer surface of a heat exchange part in the main body of the air preheater are continuously accumulated, so that the dust and scale accumulated in the flue are reduced, the circulation area is reduced, the resistance of the flue is increased, the power consumption of an induced draft fan is increased, the exhaust temperature is increased, the heat exchange effect of the air preheater is reduced, the heat loss is increased, and meanwhile, an acid medium in the dust and scale can corrode and damage the flue to influence the service life.
In view of the above-mentioned drawbacks, the inventors of the present application have conducted extensive research and practice to finally obtain a novel flue gas outlet device for an air preheater.
Disclosure of Invention
The invention provides a flue gas outlet device of an air preheater, which effectively solves the problem of dust and scale deposition at a flue gas outlet section of the air preheater.
The basic concept of the technical scheme adopted by the invention is as follows:
a flue gas outlet arrangement of an air preheater comprising a flue, the flue comprising:
the flue gas input end is connected with the air preheater main body;
a flue gas output end;
a flue gas dust collection end; and
connecting the smoke input end, the smoke output end and the dust collecting end;
the joining part is provided with a slope surface which collides with smoke to settle dust, the smoke dust collecting end is used for collecting settled dust, and the smoke output end outputs smoke subjected to dust settling;
the flue gas dust collecting end is arranged below the joint part and comprises a sedimentation ash bucket connected with the joint part and a closed ash discharging device connected with the sedimentation ash bucket.
As one mode, the joining part is provided with a first slope surface facing the flue gas outlet of the flue gas output end.
As a mode, the joining part is provided with a second slope surface facing the flue gas inlet of the flue gas input end.
As a mode, the lower end of the second slope surface is connected with the bottom of the connecting part, and the upper end of the second slope surface extends to the bottom wall of the flue gas output end.
As a mode, the flue gas output end is sequentially provided with an air outlet flue and a connecting port flue along the flow direction of flue gas;
the bottom wall of the air outlet flue and the bottom wall of the connecting port flue are slope surfaces with the same slope as the second slope surface.
As a mode, the closed ash discharging device comprises a bin pump, a bin pump material level meter and a field control system, wherein a first automatic valve is arranged at the inlet of the bin pump, a second automatic valve is arranged at the outlet of the bin pump, and the first automatic valve and the second automatic valve are connected with the field control system.
As a mode, when the bin pump level indicator senses and judges that the height of dust stored in the bin pump reaches a set value, the field control system sends a control signal to interlockingly close the first automatic valve and interlockingly open the second automatic valve to unload the dust to the dust warehouse; when the bin pump level indicator senses and judges that the ash discharge is finished, the field control system sends a control signal to close the second automatic valve in an interlocking mode, and simultaneously opens the first automatic valve in an interlocking mode to collect the falling dust.
As one mode, a pressurizing power device is arranged in the bin pump, the power device of the bin pump is started to pressurize, and the dust is conveyed to the dust bin through positive pressure air force.
In one form, the first automated valve is a pneumatic rotary valve and the second automated valve is a pneumatic ash discharge valve.
As one mode, an automatic dust removing device for removing dust according to a set time interval is arranged on at least one of the first slope surface, the second slope surface, the bottom wall of the air outlet flue and the bottom wall of the connecting port flue.
As a mode, the automatic dust removal device is an automatic scraper and comprises a movable connecting rod, a movable hinge, a plate-shaped body, a driving mechanism and a control system, wherein one end of the movable connecting rod is connected with the plate-shaped body through the movable hinge, and the other end of the movable connecting rod is connected with the driving mechanism controlled by the control system through the movable hinge.
As a mode, the automatic dust removing device is a stranding cage dust scraping device, and includes a rotation center shaft, a plurality of scraping blades uniformly arranged on the circumferential direction of the rotation center shaft, a driving mechanism for driving the rotation center shaft to rotate, a control system for controlling the operation frequency of the driving mechanism, and a track arranged on the side wall of the flue for limiting the action track of the rotation center shaft.
The invention also relates to an air preheater provided with a flue gas outlet device of an air preheater according to any one of the above.
The invention also relates to a flue gas discharge method of an air preheater, which comprises the steps of enabling dust-containing flue gas to pass through the flue gas outlet device according to the above, settling dust through collision between the flue gas and a slope surface, and collecting the settled dust.
Compared with the prior art, the technical scheme of the invention has the following advantages:
1. according to the flue gas outlet device of the air preheater, the slope with a certain gradient is arranged in the flue gas outflow direction, so that dust in the flue gas collides with the slope and sinks into the dust collecting device (such as a dust hopper) along the slope of the flue under the influence of collision resistance, thereby reducing the dust deposition and scaling of the flue, effectively solving the problems of increased flue resistance, increased power consumption of a draught fan, increased smoke exhaust temperature, reduced heat exchange effect of the air preheater and increased heat loss caused by the dust deposition of the flue, and effectively avoiding the flue dust deposition from corroding and damaging the flue.
2. The invention further arranges a plurality of slopes with different slopes in the flue, for example, the arrangement of different slopes such as the joining part, the air outlet flue and the connecting port flue improves the dust collision probability, promotes the dust sedimentation, reduces the dust content of the flue gas and lightens the burden of the subsequent treatment process.
3. As a further preferable scheme, the invention adopts the conical sedimentation ash bucket and the closed ash discharging device, and the ash is conveyed to the ash storehouse through positive pressure pneumatic power, so that the escape of dust and the environmental pollution are avoided, and the recovery rate of the dust is improved. Through retrieving or transporting to cement plant, brick and tile factory, realize sealing and full-automatic unloading ash, reduce the cost of labor to environmental protection, sustainable utilization.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic view of the construction of the flue gas outlet device of the air preheater of the present invention.
Fig. 2 isbase:Sub>A viewbase:Sub>A-base:Sub>A of fig. 1.
Fig. 3 is a schematic view of the construction of the joint portion shown in fig. 1.
Fig. 4 is a schematic structural view of the air outlet flue shown in fig. 1.
Fig. 5 is a schematic view of the construction of the joined flue shown in fig. 1.
FIG. 6 is a schematic structural view of the automatic scraping board of the present invention.
Fig. 7 is a schematic structural view of another automatic dust removing apparatus used in the present invention.
The figures in the drawings represent:
100. the air preheater comprises an air preheater body, 11, a vertical transition flue, 12, a connecting part, 121, a first slope surface, 122, a second slope surface, 123, a first bottom part, 124, a second bottom part, 125, a right-angled waist part, 13, an air outlet flue, 131, an access manhole, 132, an A end of the air outlet flue, 133, a B end of the air outlet flue, 134, an arc transition surface, 135, an inclined slope surface H,14, a connecting port flue, 141, a horizontal transition surface, 142, a C end of the connecting port flue, 143, a D end of the connecting port flue, 144, an inclined slope surface G,15, a sedimentation ash bucket, 16, a closed ash discharging device, 161, a pneumatic rotary valve, 162, a bin pump material level meter, 163, an on-site control system, 164, a bin pump, 165, a pneumatic unloading valve, 17 angle steel, 18, an automatic ash scraping plate, 181, a plate body, a movable connecting rod, 183, a movable hinge, 184, a control system, 19, a dust scraping cage, 191, a rotary central shaft, and 200 expansion joints.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The term "connection" as used herein may refer to a direct connection or an indirect connection between mechanical structures, or may refer to a virtual connection such as an electrical connection or a signal connection.
There is provided a flue gas outlet device for an air preheater, comprising a flue, the flue comprising:
a flue gas input connected to the air preheater body 100;
a flue gas output end;
a flue gas dust collection end; and
a connection part 12 for connecting the flue gas input end, the flue gas output end and the dust collection end;
the joining part 12 is provided with a slope surface which collides with flue gas to settle dust, the flue gas dust collecting end is used for collecting settled dust, and the flue gas output end outputs flue gas after the settled dust.
In one form, the flue gas dust collecting end is provided below the engaging portion 12.
In one form, the engagement portion 12 is provided with a first sloping surface 121 facing the flue gas outlet of the flue gas outlet.
In one form, the engagement portion 12 is provided with a second ramp surface 122 facing the flue gas inlet of the flue gas input.
In one mode, the lower end of the second slope surface 122 is connected to the bottom of the joining part 12, and the upper end extends to the bottom wall of the smoke output end.
As a mode, the flue gas output end is sequentially provided with an air outlet flue 13 and a connecting port flue 14 along the flow direction of flue gas;
the bottom wall of the air outlet flue 13 and the bottom wall of the connecting port flue 14 are slopes with the same slope as the second slope 122.
Within the scope of the above general design concept, may be implemented in a variety of different specific configurations, and several embodiments are provided below as examples to facilitate a better understanding of the present invention. The structure not specifically described in the following embodiments may adopt an existing conventional structure.
Example 1
Referring to fig. 1 to 5, a flue gas outlet device of an air preheater includes a flue including a joining portion 12 provided in a flue gas outflow direction, and as a simplified structure, a flue gas inlet of the joining portion 12 may be used as a flue gas input end.
The joining part 12 is of a right-angle trapezoid-like structure, and comprises a first bottom 123 located above, a second bottom 124 located below, and a right-angle waist part 125 and an oblique waist part which are arranged between the first bottom 123 and the second bottom 124, wherein the oblique waist part forms a first slope 121, and a second slope 122 is formed between the right-angle waist part 125 and the second bottom 124;
the first bottom 123 of the joint part 12 is connected with the air preheater main body 100, the second bottom 124 of the joint part 12 is connected with the dust collecting device to form a smoke dust collecting end, and the right-angled waist part 125 of the joint part 12 outputs smoke.
The dust removal device further comprises an air outlet flue 13 and a connector flue 14, the air outlet flue 13 and the connector flue 14 form a flue gas output end, a right-angle waist portion 125 of the connection portion 12 is connected with an A end 132 of the air outlet flue, a B end 133 of the air outlet flue is connected with a C end 142 of the connector flue, and a D end 143 of the connector flue is connected with a dust removal device and a chimney through an external flue, so that the flue gas after dust removal is exhausted.
In one way, the first bottom 123 is wider than the second bottom 124.
The structure of the connecting part 12 enables dust in the flue gas to settle down along the slope surface of the flue and enter the dust collecting device, thereby avoiding dust deposition and scaling at the bottom of the flue, effectively solving the problems of flue resistance increase caused by the dust deposition of the flue, power consumption increase of an induced draft fan, smoke exhaust temperature rise caused by the dust deposition of the flue, heat exchange effect reduction of an air preheater and heat loss increase, and effectively avoiding the corrosion damage of the flue.
The end a 132 of the air outlet flue has the same structure as the right-angled waist portion 125 of the joining portion 12, the end B133 of the air outlet flue is parallel to the right-angled waist portion 125 of the joining portion 12, an arc transition surface 134 (i.e., the top wall of the air outlet flue 13) is arranged at the upper portion between the end a 132 and the end B133 of the air outlet flue, and an inclined slope surface H-135 (i.e., the bottom wall of the air outlet flue 13) having a smooth surface is linearly extended from the second slope surface 122 at the lower portion.
A horizontal transition surface 141 (namely the top wall of the connecting port flue 14) is arranged at the upper part between the C end 142 and the D end 143 of the connecting port flue, and an inclined slope G-144 (namely the bottom wall of the connecting port flue 14) with a smooth surface is arranged at the lower part of the connecting port flue and extends linearly from the inclined slope H-135.
In one aspect, the angle α between the first slope surface 121 and the horizontal direction is 35 to 65 °, for example, 35 °, 38 °, 40 °, 42 °, 45 °, 48 °, 50 °, 52 °, 55 °, 60 °, 63 °, 65 °, and the like,
in one aspect, an angle β between the second slope surface 122 and the horizontal direction is 15 to 35 °, for example, 15 °,18 °,20 °, 23 °, 25 °, 28 °, 30 °, 32 °, 34 °,35 °, and the like, and the first slope surface 121 and the second slope surface 122 are smooth slope surfaces.
The arrangement of the first slope surface 121 and the second slope surface 122 can promote the dust contained in the flue gas to settle, and the settled dust is not easy to remain on the slope surface.
The dust collecting device comprises a sedimentation ash bucket 15, and the sedimentation ash bucket 15 can adopt a common ash bucket in the prior art to unload collected dust through manual operation.
Further provided is an air preheater comprising the above-described flue gas outlet device.
Example 2
Another flue gas outlet device with better effect is provided, referring to fig. 1-5, the flue gas outlet device is provided with a vertical transition flue 11 and a connecting part 12 in sequence along the flue gas outflow direction, and the structure is more optimized than that of embodiment 1, and the vertical transition flue 11 is used as a flue gas input end.
A vertical transition flue 11 with a transition function is further arranged and matched with the structural characteristics of the joint part 12, so that the flue gas can flow conveniently and dust can be settled.
The joining part 12 is of a right-angle trapezoid-like structure, and includes a first bottom 123 located above, a second bottom 124 located below, and a right-angle waist part 125 and an oblique waist part which are arranged between the two bottoms, wherein the oblique waist part forms a first slope 121, and a second slope 122 is formed between the right-angle waist part 125 and the second bottom 124;
the upper end of the vertical transition flue 11 is connected with the air preheater main body 100, the lower end of the vertical transition flue is connected with the first bottom 123 of the joint part 12, the second bottom 124 of the joint part 12 is connected with a dust collecting device to form a flue gas dust collecting end, and flue gas is output from the right-angle waist part 125 of the joint part 12.
The smoke exhaust device further comprises an air outlet flue 13 and a connecting port flue 14, the air outlet flue 13 and the connecting port flue 14 form a smoke exhaust output end, a right-angle waist portion 125 of the connecting portion 12 is connected with an A end 132 of the air outlet flue, a B end 133 of the air outlet flue is connected with a C end 142 of the connecting port flue, a D end 143 of the connecting port flue is provided with a flange and is connected with the metal expansion joint 200, then the metal expansion joint 200 is connected with an external flue, and the external flue is connected with a dust removal device and a chimney to exhaust smoke.
The air preheater body 100 and the metal expansion joint 200 may be of conventional construction.
In specific implementation, the air preheater main body 100, the vertical transition flue 11, the joining portion 1212, the air outlet flue 13, the connection port flue 14, and the sedimentation ash hopper 15 are welded into a whole.
The connecting port flue 14 and the expansion joint 200 are connected and fastened through a flange, a bolt, a nut and a high-temperature-resistant ceramic fiber gasket, the flange is arranged on the periphery of the butt joint part, and the outer edge of the flange is welded in a sealing mode to guarantee sealing performance.
As one mode, the flange may specifically be an angle iron flange.
The A end 132 of the air outlet flue has the same structure with the right-angle waist part 125 of the joining part 12, the two can be overlapped and butted, the B end 133 is parallel to the right-angle waist part 125 of the joining part 12, the upper part between the A end 132 and the B end 133 of the air outlet flue is provided with an arc transition surface 134 (namely the top wall of the air outlet flue 13), the lower part is provided with an inclined slope surface H-135 with a smooth surface (namely the bottom wall of the air outlet flue 13) by the linear extension of the second slope surface 122, and one side surface of the air outlet flue 13 is provided with an inspection manhole 131.
The flue is internally provided with auxiliary elements such as ladders and handrails which are matched with the maintenance manhole 131 for use, and the auxiliary elements enter the flue through the maintenance manhole 131, so that the automatic dust removal device can be maintained, a flue wall plate can be inspected, dust can be cleaned in an auxiliary mode, and the like.
A horizontal transition surface 141 (namely the top wall of the connecting port flue 14) is arranged at the upper part between the C end 142 and the D end 143 of the connecting port flue, and an inclined slope G-144 (namely the bottom wall of the connecting port flue 14) with a smooth surface is arranged at the lower part of the connecting port flue and extends linearly from the inclined slope H-135.
In one aspect, the angle α between the first slope surface 121 and the horizontal direction is 35 to 65 °, for example, 35 °, 38 °, 40 °, 42 °, 45 °, 48 °, 50 °, 52 °, 55 °, 60 °, 63 °, 65 °.
In one aspect, the angle β between the second slope surface 122 and the horizontal direction is 15 to 35 °, for example, 15 °,18 °,20 °, 23 °, 25 °, 28 °, 30 °, 32 °, 34 °,35 °, and the like.
The slope of the first slope surface 121 and the second slope surface 122 is set to facilitate dust to slide to the dust bin.
The first slope surface 121 and the second slope surface 122 are smooth slope surfaces.
The included angles between the inclined slope surfaces H-135 and G-144 and the horizontal direction are the same as the included angle beta between the second slope surface 122 and the horizontal direction.
The dust collecting device can adopt a common dust hopper in the prior art, and the collected dust is unloaded through manual operation.
Further provided is an air preheater comprising the above-described flue gas outlet device.
Example 3
The dust collecting device in the embodiment 1-2 is optimized and improved, automatic collection and closed dust unloading are realized, the problem of pollution caused by dust escape is avoided, and the dust collecting device is more environment-friendly and intelligent.
The dust collecting device comprises a sedimentation ash bucket 15 and a closed ash discharging device 16; the inlet of the sedimentation ash bucket 15 is connected with the second bottom 124 of the connecting part 12, the outlet is connected with the inlet of the closed ash discharging device 16, and the closed ash discharging device 16 comprises a sealed cavity provided with an inlet and an outlet and a valve for controlling the opening and closing of the inlet and the outlet.
The inlet of the sedimentation hopper 15 is welded at the outlet of the joint 1212 and is kept normally open.
The closed type dust discharging device 16 is flange-connected to the sedimentation hopper 15, and internal components of the closed type dust discharging device 16, such as a pneumatic rotary valve 161, a bin pump level gauge 162, a bin pump 164, and a pneumatic dust discharging valve 165, are also flange-connected.
Specifically, the closed ash discharging device 16 comprises a bin pump 164 (having a sealed cavity), a bin pump level gauge 162 and an on-site control system 163, wherein a first automatic valve is arranged at an inlet of the bin pump 164, a second automatic valve is arranged at an outlet of the bin pump 164, and the first automatic valve and the second automatic valve are connected with the on-site control system.
The connection mode of the valve and the field control system can be electric connection, signal connection, bluetooth connection and the like, and the control system can automatically adjust the valve.
When the bin pump level indicator 162 senses that the height of the dust stored in the bin pump 164 reaches a set value, the field control system 163 sends a control signal to interlockingly close the first automatic valve and interlockingly open the second automatic valve to unload the dust to the dust warehouse; when the bin pump level indicator 162 senses that the ash discharge is finished, the field control system 163 sends a control signal to interlockingly close the second automatic valve and interlockingly open the first automatic valve to collect the falling dust.
As a specific mode, a pressurizing power device is arranged in the bin pump 164, the power device of the bin pump 164 is started to pressurize, and dust is conveyed to the dust bin through positive pressure air force, so that the bin pump 164 and a pipeline can be purged while the dust is conveyed, and dust deposition is prevented.
Specifically, the power device includes a compressed air source and a control valve, when conveying dust, the control valve feeds compressed air into the bin pump 164, and the pressure of the compressed air is used to provide conveying power to convey the dust to the dust bin.
In one embodiment, the first automatic valve is a pneumatic rotary valve 161 and the second automatic valve is a pneumatic ash discharge valve 165, which are configured to facilitate use with a pressurized power plant, simplifying system setup.
Further provided is an air preheater comprising the above-described flue gas outlet device.
Example 4
The arrangement of the internal structure of the flue in the embodiments 1-3 is optimized, and an automatic ash scraping plate 18 is further arranged, and referring to fig. 2 and 6, the automatic ash scraping plate 18 comprises: the device comprises a movable connecting rod 182, a movable hinge 183, a plate-shaped body 181, a driving mechanism and a control system, wherein one end of the movable connecting rod 182 is connected with the plate-shaped body 181 through the movable hinge 183, and the other end of the movable connecting rod 182 is connected with the driving mechanism controlled by the control system through the movable hinge 183.
By one approach, the movable connecting rod 182 includes a first link and a second link connected by a movable hinge 183.
During concrete implementation, a plurality of groups of dust scraping plates can be arranged on one side or two sides of the flue according to the size of the transverse dimension in the flue, the total length of the connecting rod meets the requirement design of the width of the flue, the connecting rod and the plate body are movably hinged, and the action frequency of the dust scraping plates can be set according to the dust content in the flue gas.
Dust can be better prevented from being attached to the inner surface of the flue, and the cleanliness in the flue is further improved.
At least one of the first slope surface 121, the inclined slope surface H-135 and the inclined slope surface G-144 is provided with an automatic ash scraping plate 18.
Referring to fig. 2, as a specific mode, the first slope surface 121, the inclined slope surface H-135 and the inclined slope surface G-144 are all provided with the automatic ash scraping plates 18.
The control system corresponding to the automatic dust scraping plate 18 can regulate and control the automatic dust scraping plate 18 to automatically scrape off dust accumulated on the surface of the flue at set time intervals according to the dust content of flue gas entering the flue.
Aiming at the situation of modification on the basis of the embodiment 3, a control system for regulating and controlling the operation of the automatic dust scraping plate 18 can be integrated with the field control system 163 into a whole for use, so that the system setting is simplified.
The automatic scraper 18 can be serviced through the service manhole 131.
Further provided is an air preheater comprising the above-described flue gas outlet device.
Example 5
Referring to fig. 7, another automatic dust removing apparatus, i.e., a stranding cage dust scraping apparatus 19, is provided, including: the device comprises a plurality of scraping blades 191, a rotating central shaft 192, a driving motor, a control system and a track, wherein the scraping blades 191 are uniformly arranged on the circumference of the rotating central shaft 192, the track is arranged on the side wall in a flue and limits the action track of the rotating central shaft 192, the rotating central shaft 192 is connected with the driving motor, and the control system is connected with the driving motor and regulates and controls the running frequency of the driving motor.
The rotation center shaft 192 drives the scraper 191 to remove dust by rotation, and on the other hand, the dust is removed by reciprocating along the first slope 121, the second slope 122, the bottom wall of the air outlet flue 13 or the bottom wall of the connecting port flue 14 by the rail.
It is understood that the wiper blade 191 should have at least a dust-scraping portion capable of contacting the dust-deposited portion, and referring to fig. 7, the wiper blade 191 includes connecting portions uniformly distributed in each radial direction along the rotation center axis 192, and dust-scraping portions bent and extended from the connecting portions.
In the specific implementation, the structure of the scraping blade 191 can be adjusted according to the setting condition of the flue, but the structure setting is more suitable for the setting characteristics of the flue, and has better ash scraping effect and simple structure.
Aiming at the situation of improvement on the basis of the embodiment 3, a control system for regulating and controlling the operation of the winch cage ash scraping device 19 can be integrated with the field control system 163 for use, so that the system setting is simplified.
Example 6
The structure of the sedimentation hopper 15 in example 3 was optimized.
The sedimentation ash bucket 15 has a cone-like structure, one end of the sedimentation ash bucket 15, which is connected with the second bottom 124 of the connecting part 12, is provided with a rectangular cross section, one end of the sedimentation ash bucket 15, which is connected with the inlet of the closed ash discharging device 16, is provided with a circular cross section, the upper part of the sedimentation ash bucket is circular, so that the dust in the flue can smoothly descend, the dust is prevented from remaining, the collected dust can be collected in the central part of the bin pump 164, and the automatic ash discharging is facilitated.
Further provided is an air preheater comprising the above-described flue gas outlet device.
Example 7
As one mode, the flue is made of steel.
As one mode, a reinforcing structure is provided on the outer surface of the flue, for example, angle steel 17 is provided on the outer surface, and it can be installed by welding for reinforcing the whole formed by welding the vertical transition flue 11, the joining part 12, the air outlet flue 13, the connection port flue 14, and the sedimentation ash hopper 15.
Example 8
A smoke discharging method of an air preheater comprises the steps of enabling dust-containing smoke to pass through a smoke outlet device according to any one of the smoke outlet devices, settling dust through collision of the smoke and a slope surface, and recycling the settled dust.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (11)
1. A flue gas outlet arrangement of an air preheater comprising a flue, the flue comprising:
the flue gas input end is connected with the air preheater main body;
a flue gas output end;
a flue gas dust collection end; and
connecting the smoke input end, the smoke output end and the dust collecting end;
the joining part is provided with a slope surface which collides with the flue gas to settle dust, the flue gas dust collecting end is used for collecting settled dust, and the flue gas output end is used for outputting the flue gas after the settled dust;
the smoke dust collecting end is arranged below the connecting part and comprises a sedimentation ash bucket connected with the connecting part and a closed ash discharging device connected with the sedimentation ash bucket;
the flue gas output end is sequentially provided with an air outlet flue and a connecting port flue along the flow direction of flue gas;
the joint part is of a right-angle trapezoid-like structure and comprises a first bottom part positioned above, a second bottom part positioned below, a right-angle waist part and an oblique waist part, wherein the right-angle waist part and the oblique waist part are arranged between the first bottom part and the second bottom part, the oblique waist part forms a first slope surface, and a second slope surface is formed between the right-angle waist part and the second bottom part; the first base is wider than the second base;
the bottom wall of the air outlet flue and the bottom wall of the connecting port flue are slopes with the same gradient as the second slope;
the first bottom of the joint part is connected with the air preheater main body, the second bottom of the joint part is connected with the dust collecting device to form a smoke dust collecting end, and smoke is output from the joined right-angled waist part;
the right-angle waist part of the joining part is connected with one end of the air outlet flue, the other end of the air outlet flue is connected with one end of the connecting port flue, and the other end of the connecting port flue is connected with a dust removal device and a chimney through an external flue so as to empty the dust-removed flue gas;
the included angle alpha between the first slope surface and the horizontal direction is 35-65;
the included angle beta between the second slope surface and the horizontal direction is 15-35 degrees, and the first slope surface and the second slope surface are smooth slope surfaces.
2. The flue gas outlet device of an air preheater according to claim 1, wherein said closed ash discharger comprises a bin pump, a bin pump level gauge and an on-site control system, wherein a first automatic valve is arranged at an inlet of said bin pump, a second automatic valve is arranged at an outlet of said bin pump, and said first automatic valve and said second automatic valve are connected to said on-site control system.
3. The flue gas outlet device of the air preheater as claimed in claim 2, wherein when the bin pump level indicator senses and judges that the height of the dust stored in the bin pump reaches a set value, the field control system sends a control signal to interlockingly close the first automatic valve and interlockingly open the second automatic valve to unload the dust to the dust bin; when the bin pump level indicator senses and judges that the ash discharge is finished, the field control system sends a control signal to close the second automatic valve in an interlocking mode, and simultaneously opens the first automatic valve in an interlocking mode to collect the falling dust.
4. A flue gas outlet device of an air preheater according to claim 2, wherein a pressurizing power device is arranged in the bin pump, the power device of the bin pump is started to pressurize, and dust is conveyed to the dust warehouse through positive pressure air force.
5. A flue gas outlet device for an air preheater as recited in claim 2, wherein said first automatic valve is a pneumatic rotary valve and said second automatic valve is a pneumatic dust discharge valve.
6. A flue gas outlet device of an air preheater according to claim 1, wherein at least one of the first sloping surface, the second sloping surface, the bottom wall of the air outlet flue and the bottom wall of the connecting port flue is provided with an automatic dust removing device.
7. A flue gas outlet device of an air preheater according to claim 6, wherein said automatic dust removing means removes dust at set time intervals.
8. A flue gas outlet device of an air preheater according to claim 6 or 7, wherein the automatic dust removal device is an automatic scraper, and comprises a movable connecting rod, a movable hinge, a plate-shaped body, a driving mechanism and a control system, wherein one end of the movable connecting rod is connected with the plate-shaped body through the movable hinge, and the other end of the movable connecting rod is connected with the driving mechanism controlled by the control system through the movable hinge.
9. A flue gas outlet device of an air preheater according to claim 6 or 7, wherein the automatic dust removing device is a stranding cage dust scraping device, and comprises a rotating central shaft, a plurality of scraping blades uniformly arranged on the circumference of the rotating central shaft, a driving mechanism for driving the rotating central shaft to operate, a control system for controlling the operating frequency of the driving mechanism, and a track arranged on the side wall of the flue for limiting the action track of the rotating central shaft.
10. An air preheater provided with a flue gas outlet arrangement of an air preheater according to any one of claims 1 to 9.
11. A method of exhausting flue gas from an air preheater comprising passing dusty flue gas through the flue gas outlet device of claim 1, settling the dust by collision of the flue gas with a ramp while collecting the settled dust.
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| JPH08117559A (en) * | 1994-10-25 | 1996-05-14 | Mitsubishi Heavy Ind Ltd | Denitration apparatus of coal burning boiler |
| WO2002020128A1 (en) * | 2000-09-06 | 2002-03-14 | Nkk Corporation | Method and device for cooling and collecting dust from exhaust gas containing soot and dust |
| JP4197289B2 (en) * | 2003-11-06 | 2008-12-17 | 三菱重工環境エンジニアリング株式会社 | Ash processing equipment |
| SE527104C2 (en) * | 2004-05-21 | 2005-12-20 | Alstom Technology Ltd | Method and apparatus for separating dust particles |
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| CN103047667B (en) * | 2013-01-23 | 2015-12-23 | 国核电力规划设计研究院 | Front horizontal flue collapse prevention device of thermal power plant deduster |
| JP6005015B2 (en) * | 2013-09-04 | 2016-10-12 | 三菱日立パワーシステムズ株式会社 | Duct wall structure |
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| CN206771399U (en) * | 2017-05-18 | 2017-12-19 | 龙净科杰环保技术（上海）有限公司 | For solving the problems, such as the SCR denitration device of denitration gas approach dust stratification |
| CN109028121A (en) * | 2018-05-15 | 2018-12-18 | 许昌龙岗发电有限责任公司 | A kind of dust-removing flue reducing coal unit catalyst abrasion |
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| JP7191642B2 (en) * | 2018-10-23 | 2022-12-19 | 三菱重工業株式会社 | Boiler, ash processing equipment, method of operating boiler and method of operating ash processing equipment |
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