CN211424439U - Condensate collecting system of wet chimney inner tube - Google Patents
Condensate collecting system of wet chimney inner tube Download PDFInfo
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- CN211424439U CN211424439U CN201922065019.5U CN201922065019U CN211424439U CN 211424439 U CN211424439 U CN 211424439U CN 201922065019 U CN201922065019 U CN 201922065019U CN 211424439 U CN211424439 U CN 211424439U
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Abstract
The utility model discloses a condensate collecting system of wet chimney inner tube, including throat pipe, condensate collection device. The large-caliber end of the reducing pipe is connected to the upper end of the wet chimney inner cylinder and used for collecting condensate flowing upwards on the wall surface of the wet chimney inner cylinder and secondary entrained liquid in the flue gas. The large-caliber end of the reducing pipe is welded, riveted or connected with the upper end of the wet chimney inner cylinder through a flange. The condensate collecting device is arranged on the outer wall surface of the necking pipe and is used for collecting condensate and secondary entrained liquid collected by the necking pipe. The small-caliber end of the reducing pipe is provided with a bevel slope which is used for guiding condensate and secondary entrained liquid at the upper end of the reducing pipe to flow to a condensate collecting device. The condensate generated by the inner wall of the wet chimney is effectively prevented from being discharged into the atmosphere by secondary entrainment of the flue gas flow, the acid mist settlement near the chimney or the chimney rain phenomenon is effectively relieved, and the problem that the existing wet chimney cannot collect the condensate of the saturated clean flue gas is solved.
Description
Technical Field
The invention belongs to the technical field of chimney design, and particularly relates to a condensate collecting system for an inner barrel of a wet chimney.
Background
The limestone-gypsum wet flue gas desulfurization process is the most widely applied and mature process in all countries in the world at present, is also the leading process of domestic thermal power plant desulfurization, and is used in thermal power plant, chemical industry, metallurgy and other industries. More than 90% of thermal power generating units with more than 300MW in China adopt limestone-gypsum Wet Flue Gas Desulfurization (WFGD) technology, the flue Gas temperature at the outlet of an absorption tower in a limestone-gypsum wet desulfurization system is about 50 ℃, and the 'flue Gas temperature at the inlet of a chimney after desulfurization under the design working condition' stipulates in the 'technical specification for flue Gas desulfurization design of a thermal power plant' (DL/T5196-2004) in China should generally reach more than 80 ℃ for emission, so the WFGD systems installed in the early stage are basically matched with a flue Gas heat exchanger (Gas-Gas Heater, GGH). However, in actual operation, the problems of serious corrosion, blockage of heat exchange elements and the like of GGH parts can occur, and the safe and stable operation of the WFGD system is influenced. In view of the technical rules of flue gas desulfurization design of a thermal power plant, a flue gas heat exchanger is not needed when the environmental protection requirement is met, and a chimney and a flue have perfect anti-corrosion and drainage measures and are reasonable in technical economy, the GGH is rarely installed in a WFGD system designed in the later period, and the GGH device is also cancelled in the original WFGD system.
In the actual operation process, when saturated clean smoke of the WFGD system without the GGH is directly discharged to the atmosphere through a wet chimney, the phenomenon of chimney rain or acid mist settlement is easy to generate, and a new environmental protection problem is brought.
The cause analysis of the chimney rain or acid mist sedimentation phenomenon is as follows:
(1) flue gas entrainment liquid
The original flue gas is washed by the spraying layer, demisted by the demister, and discharged along with the flue gas flow in the process of discharging from the outlet of the absorption tower to the top of the chimney through the connecting flue, wherein the liquid drops with the diameter of less than 50um are discharged.
(2) Condensate of flue gas
The original flue gas is washed by a spraying layer, demisted by a demister, and subjected to temperature drop of 0.5-1.0 ℃ in the process of being discharged from an outlet of an absorption tower to the top of a chimney lining through a connecting flue, so that the flue gas is saturated and condensed to generate small liquid drops.
(3) Flue gas secondary entrainment liquid
The liquid drops taken away from the demister and the liquid drops generated by condensation can be gathered on the inner surface of the inner cylinder wall of the chimney. Along with the continuous deposition of liquid drops, the liquid drops can be pulled downwards by the gravity of the liquid drops, meanwhile, the smoke can apply a pull force in the same direction as the smoke flow to the liquid, when the force from the smoke exceeds the gravity of the liquid drops, the liquid can move upwards along the inner cylinder wall of the chimney, and when the liquid drops reach the outlet of the over-wet chimney, the liquid drops leave the chimney, so that the chimney rain phenomenon is formed.
At present, most of conventional wet chimney top structures do not consider a wet environment in which the wall surface of the inner cylinder of the chimney can be dewed, and do not consider structural design of the first cylinder of the inner cylinder of the chimney and installation of a condensate collecting device.
Disclosure of Invention
The invention aims to provide a condensate collecting system for an inner cylinder of a wet chimney to solve the problem that the existing wet chimney cannot collect condensate of saturated clean flue gas.
In order to solve the problems, the technical scheme of the invention is as follows:
the invention relates to a condensate collecting system of an inner cylinder of a wet chimney, which comprises a necking pipe and a condensate collecting device;
the large-caliber end of the necking pipe is connected to the upper end of the wet chimney inner cylinder and is used for trapping condensate flowing upwards on the wall surface of the wet chimney inner cylinder and secondary entrained liquid in the flue gas;
the condensate collecting device is arranged on the outer wall surface of the necking pipe and is used for collecting the condensate and the secondary entrained liquid collected by the necking pipe;
the small-caliber end of the reducing pipe is provided with a bevel slope, and the bevel slope is used for guiding the condensate at the upper end of the reducing pipe and the secondary entrained liquid to flow to the condensate collecting device.
According to the condensate collecting system of the wet chimney inner cylinder, the condensate collecting device comprises a collecting ring plate and a guide pipe;
one end of the collecting ring plate is annularly arranged on the outer wall surface of the reducing pipe and is matched with the outer wall surface of the reducing pipe to form a collecting tank with an upward opening, and the collecting tank is used for bearing the collected condensate and the secondary entrained liquid; the guide pipe penetrates through the side wall surface of the collecting ring plate and is used for leading out the condensate and the secondary entrainment liquid in the collecting tank.
The condensate collecting system of the wet chimney inner cylinder further comprises a fixing plate, wherein the first end of the fixing plate is connected with the outer wall surface of the reducing pipe, and the second end of the fixing plate is connected with the collecting ring plate.
According to the condensate collecting system for the wet chimney inner cylinder, the included angle between the necking pipe and the horizontal direction is alpha, and the range of the included angle alpha is more than or equal to 45 degrees and less than or equal to 60 degrees.
According to the condensate collecting system of the wet chimney inner cylinder, the included angle between the bevel face of the groove and the outer wall surface of the reducing pipe is within the range of 30 degrees or less and 60 degrees or less.
According to the condensate collecting system of the wet chimney inner cylinder, the collecting ring plate is matched with the outer wall surface of the reducing pipe to form the collecting tank, and the section of the collecting tank is U-shaped, V-shaped or trapezoidal.
According to the condensate collecting system of the wet chimney inner barrel, the height range of the necking pipe is 1000-1500 mm.
According to the condensate collecting system of the wet chimney inner cylinder, the upper end of the collecting ring plate is higher than the small-caliber end of the reducing pipe, and the height difference range between the upper end of the collecting ring plate and the small-caliber end of the reducing pipe is 300-500 mm.
According to the condensate collecting system of the wet chimney inner cylinder, the horizontal distance range between the upper end of the collecting ring plate and the small-caliber end of the reducing pipe is 100-200 mm.
According to the condensate collecting system of the wet chimney inner cylinder, the large-caliber end of the reducing pipe is connected with the upper end of the wet chimney inner cylinder through welding, riveting or flange connection.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
in one embodiment of the invention, the upper end of the wet chimney is provided with the necking pipe with the opening facing to the central axis of the wet chimney, so that condensate flowing upwards from the inner cylinder wall of the wet chimney and secondary entrained liquid in the flue gas are collected; a condensate collecting device is arranged on the outer wall surface of the necking pipe to collect condensate; and a bevel slope is arranged at the small-caliber end, namely the upper end, of the reducing pipe to form a downward slope for guiding condensate at the upper end of the reducing pipe, so that the trapped condensate can more easily turn over the small-caliber end of the reducing pipe and flow into the condensate collecting device. The condensate generated by the inner wall of the wet chimney is effectively prevented from being discharged into the atmosphere by secondary entrainment of the flue gas flow, the acid mist settlement near the chimney or the chimney rain phenomenon is effectively relieved, and the problem that the existing wet chimney cannot collect the condensate of the saturated clean flue gas is solved.
Drawings
FIG. 1 is a schematic view of a condensate collection system for a wet stack inner barrel of the present invention;
FIG. 2 is a top view of the wet stack inner barrel condensate collection system of the present invention;
FIG. 3 is a cross-sectional view of a condensate collection system of the wet stack inner barrel of the present invention;
FIG. 4 is another cross-sectional view of the wet stack inner barrel condensate collection system of the present invention;
FIG. 5 is an enlarged view of the beveled slope of the condensate collection system of the wet stack inner barrel of the present invention.
Description of reference numerals: 1: an inner cylinder of a wet chimney; 2: a necking pipe; 3: a collecting ring plate; 4: a fixing plate; 5: a flow guide pipe; 6: bevel slope.
Detailed Description
The following describes in detail a condensate collecting system for a wet chimney inner barrel according to the present invention with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims.
Referring to fig. 1, in one embodiment, a condensate collection system for a wet stack inner barrel includes a choke tube 2, a condensate collection device. The large-caliber end of the reducing pipe 2 is connected to the upper end of the wet chimney inner cylinder 1 and is used for collecting condensate flowing upwards on the wall surface of the wet chimney inner cylinder 1 and secondary entrained liquid in the flue gas. The large-caliber end of the reducing pipe 2 is connected with the upper end of the wet chimney inner cylinder 1 through welding, riveting or flange connection. The condensate collecting device is arranged on the outer wall surface of the necking pipe 2 and is used for collecting the condensate and the secondary entrained liquid collected by the necking pipe 2. The small-caliber end of the reducing pipe 2 is provided with a bevel slope 6, and the bevel slope 6 is used for guiding condensate and secondary entrained liquid at the upper end of the reducing pipe 2 to flow to a condensate collecting device.
The upper end of the wet chimney is provided with a necking pipe 2 with an opening facing to the central axis of the wet chimney, so that condensate flowing upwards on the wall surface of the inner cylinder 1 of the wet chimney and secondary entrained liquid in the flue gas are collected; a condensate collecting device is arranged on the outer wall surface of the necking pipe 2 to collect condensate; and a bevel slope 6 is arranged at the small-caliber end, i.e. the upper end, of the reducing pipe 2 to form a downward slope for guiding condensate at the upper end of the reducing pipe 2, so that the trapped condensate can more easily turn over the small-caliber end of the reducing pipe 2 and flow into a condensate collecting device. The condensate generated by the inner wall of the wet chimney is effectively prevented from being discharged into the atmosphere by secondary entrainment of the flue gas flow, the acid mist settlement near the chimney or the chimney rain phenomenon is effectively relieved, and the problem that the existing wet chimney cannot collect the condensate of the saturated clean flue gas is solved.
Meanwhile, by arranging the necking pipe 2, the smoke speed at the position of the necking pipe 2 can be improved, the smoke plume height is lifted, and the phenomenon of downward washing of the smoke plume is effectively avoided. And the condensate collecting system of the embodiment has the advantages of simple structure, reliability, high efficiency, economy, practicability and easy realization.
In the present embodiment, the condensate collecting device comprises a collecting ring plate 3 and a draft tube 5. One end of the collecting ring plate 3 is annularly arranged on the outer wall surface of the reducing pipe 2, and is matched with the outer wall surface of the reducing pipe 2 to form a collecting tank with an upward opening, and the collecting tank is used for bearing collected condensate and secondary entrained liquid. The collection trough is an annular groove arranged around the choke tube 2. And the guide pipe 5 penetrates through the side wall surface of the collecting ring plate 3 and is used for leading out condensate and secondary entrained liquid in the collecting tank. The collecting ring plate 3 can be fixed on the outer wall surface of the reducing pipe 2 by riveting, welding, bonding and the like. The flow guide pipe 5 may be disposed at the bottom of the collecting ring plate 3 to discharge the condensate in the collecting tank, and the opening direction of the other end of the flow guide pipe 5 is mainly determined according to the arrangement and running direction of the flow guide pipe 5, and is not particularly limited herein. The collecting ring plate 3 can be made of glass Fiber Reinforced Plastic (FRP) or Polypropylene Plastic (PP) or alloy material. The draft tube 5 is made of FRP or PP or alloy material, and the wet chimney inner cylinder 1 can be made of concrete, brick or metal material. The nominal diameter of the flow-guiding tube 5 ranges from DN80 to DN300, preferably DN 150.
Wherein, the condensate collection device includes fixed plate 4, and the first end of fixed plate 4 links to each other with the outer wall surface of throat pipe 2, and the second end of fixed plate 4 links to each other with collection crown plate 3. Mode such as fixed plate 4 accessible riveting, welding, bonding set up between throat pipe 2 and collection crown plate 3 for the structural strength of strengthening the throat pipe 2 and collecting crown plate 3 junction makes the collecting vat that the cooperation formed difficult fracture. The material of the fixing plate 4 corresponds to the material of the collecting trough.
In other embodiments, the cross-sectional shape of the collecting tank formed by the collecting ring plate 3 and the outer wall surface of the reducing pipe 2 may also be U-shaped, V-shaped or trapezoidal, and the specific shape only needs to be satisfied to be able to carry condensate, which is not limited herein.
In this embodiment, the included angle between the necking pipe 2 and the horizontal direction is α, and the included angle α is in the range of 45 ° to 60 °. The material of the necking pipe 2 can be the same as that of the wet chimney inner cylinder 1, and the wall thickness of the necking pipe 2 is generally 12-20 mm.
In the embodiment, the included angle between the bevel 6 and the outer wall surface of the reducing pipe 2 is not less than 30 degrees and not more than 60 degrees.
In the present embodiment, the height W1 of the throat pipe 2 is in the range of 1000 to 1500 mm. The upper end of the collecting ring plate 3 is higher than the small-caliber end of the reducing pipe 2, and the height difference W2 between the upper end of the collecting ring plate 3 and the small-caliber end of the reducing pipe 2 ranges from 300 mm to 500 mm. The horizontal distance W3 between the upper end of the collecting ring plate 3 and the small-caliber end of the reducing pipe 2 is 100-200 mm.
When condensed liquid drops are gathered in the first area of the wet chimney inner cylinder 1, along with the continuous deposition of the liquid drops, the condensed liquid drops are subjected to downward gravity of the condensed liquid drops and upward smoke shearing force applied by smoke to the condensed liquid drops, and when the smoke shearing force is equal to or exceeds the gravity of the liquid drops, the liquid drops can be peeled off the wall surface and enter the smoke again, so that secondary entrained liquid is formed, the particle size of the secondary entrained liquid drops is large, and the secondary entrained liquid drops are a main source for forming chimney rain.
In the embodiment, the inclined necking pipe 2 is arranged at the head of the original inner cylinder, so that condensate flowing upwards on the wall surface of the inner cylinder and secondary entrained liquid in smoke are effectively collected; secondly, a bevel slope 6 is arranged at the top of the reducing pipe 2, so that the trapped liquid drops can easily turn over the reducing pipe 2 and enter a collecting tank arranged along the circumference of the reducing pipe 2; and then discharged through the draft tube 5. Finally, condensate is effectively prevented from being discharged to the atmosphere by secondary entrainment of flue gas, and the phenomenon of acid mist settlement or chimney rain near a chimney is effectively relieved.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.
Claims (10)
1. A condensate collecting system of a wet chimney inner cylinder is characterized by comprising a necking pipe and a condensate collecting device;
the large-caliber end of the necking pipe is connected to the upper end of the wet chimney inner cylinder and is used for trapping condensate flowing upwards on the wall surface of the wet chimney inner cylinder and secondary entrained liquid in the flue gas;
the condensate collecting device is arranged on the outer wall surface of the necking pipe and is used for collecting the condensate and the secondary entrained liquid collected by the necking pipe;
the small-caliber end of the reducing pipe is provided with a bevel slope, and the bevel slope is used for guiding the condensate at the upper end of the reducing pipe and the secondary entrained liquid to flow to the condensate collecting device.
2. The wet stack inner drum condensate collection system of claim 1, wherein the condensate collection device comprises a collection ring plate, a draft tube;
one end of the collecting ring plate is annularly arranged on the outer wall surface of the reducing pipe and is matched with the outer wall surface of the reducing pipe to form a collecting tank with an upward opening, and the collecting tank is used for bearing the collected condensate and the secondary entrained liquid; the guide pipe penetrates through the side wall surface of the collecting ring plate and is used for leading out the condensate and the secondary entrainment liquid in the collecting tank.
3. The wet stack inner barrel condensate collection system of claim 2, further comprising a retaining plate, a first end of the retaining plate coupled to the outer wall surface of the throat tube and a second end of the retaining plate coupled to the collection ring plate.
4. The wet chimney inner barrel condensate collection system of claim 1, wherein the angle α of the throat tube to the horizontal is in the range of 45 ° α to 60 °.
5. The condensate collection system for an inner tube of a wet chimney according to claim 1, wherein the included angle between the bevel slope and the outer wall surface of the throat tube is in a range of 30 ° to 60 °.
6. The wet stack inner drum condensate collection system of claim 2, wherein the collection trough formed by the collection ring plate in cooperation with the outer wall surface of the throat pipe has a U-shaped, V-shaped, or trapezoidal cross-sectional shape.
7. The wet stack inner barrel condensate collection system of claim 1, wherein the height of the throat tube ranges from 1000 mm to 1500 mm.
8. The wet stack inner drum condensate collection system of claim 2, wherein the upper end of the collector ring plate is higher than the small bore end of the throat pipe, and wherein the difference in height between the upper end of the collector ring plate and the small bore end of the throat pipe is in the range of 300-500 mm.
9. The wet stack drum condensate collection system of claim 2, wherein the upper end of the collector ring plate is horizontally spaced from the small bore end of the throat pipe by a distance in the range of 100 mm to 200 mm.
10. The wet stack inner barrel condensate collection system of claim 1, wherein the large bore end of the reducer pipe is welded, riveted, or flanged to the upper end of the wet stack inner barrel.
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| CN201922065019.5U CN211424439U (en) | 2019-11-26 | 2019-11-26 | Condensate collecting system of wet chimney inner tube |
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| CN201922065019.5U CN211424439U (en) | 2019-11-26 | 2019-11-26 | Condensate collecting system of wet chimney inner tube |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110762547A (en) * | 2019-11-26 | 2020-02-07 | 上海迪夫格环境科技有限公司 | Condensate collecting system of wet chimney inner tube |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110762547A (en) * | 2019-11-26 | 2020-02-07 | 上海迪夫格环境科技有限公司 | Condensate collecting system of wet chimney inner tube |
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