CN213748016U - High-efficient flue gas heat transfer device - Google Patents

Abstract

The utility model discloses a high-efficient flue gas heat transfer device, including the heat transfer casing, by preceding interval distribution in proper order after to have a plurality of rows of spiral flat tube heat exchange module group in the heat transfer casing, each spiral flat tube heat exchange module group makes the inside heliciform flue gas runner that forms of heat transfer casing, and every row of spiral flat tube heat exchange module group is by a plurality of range upon range of fixed spiral flat tube heat exchange module from top to bottom and constitutes, and every spiral flat tube heat exchange module's structure includes: the heat exchange device comprises a module frame, wherein a plurality of rows of spiral flat pipes are supported between end plates at two sides of the module frame, each spiral flat pipe enables the interior of the module frame to form a spiral flue gas flow channel, each two rows of spiral flat pipes form a heat exchange pipe group, a plurality of header groups positioned outside a heat exchange shell are arranged on the outer side of the end plate at one side of the module frame, and each header group consists of a drainage header and a steam inlet header; all the steam inlet headers are communicated with a steam inlet main pipe, and all the drainage headers are communicated with a drainage main pipe. The utility model has the advantages of can improve heat exchange efficiency.

Description

High-efficient flue gas heat transfer device

Technical Field

The utility model relates to a flue gas optimal utilization energy saving and emission reduction equipment technical field, concretely relates to high-efficient flue gas heat transfer device.

Background

At present, the problem of air pollution in China is very severe, the problem of composite air pollution such as dust haze, photochemical smog, acid rain and the like is still prominent, the comprehensive improvement strength of the air environment is increased, the national policy of energy conservation and emission reduction is developed continuously, and the control of the air pollutants in key industries such as coal-fired power plants, coal-fired industrial boilers and the like is strengthened. At present, most of domestic flue gas in the electric power, steel, coking and chemical industries is subjected to spray or wet desulphurization before being discharged, the temperature is reduced to 45-55 ℃, the flue gas is usually saturated wet flue gas at the moment, the flue gas contains a large amount of water vapor, and the water vapor contains more soluble salts, SO3, gel dust, micro dust and other components capable of forming haze; if the smoke is directly discharged from the chimney and enters the ambient air with lower temperature, because the saturation humidity of the ambient air is lower, water vapor in the smoke can be condensed to form colored smoke plume in the process of reducing the temperature of the smoke, and chimney rain and gypsum rain can be formed in a certain range around the chimney if the colored smoke plume is serious. In order to avoid white floc formation and chimney damage in the process of discharging low-temperature saturated flue gas into the outside through a chimney, a heat exchange device for heating the low-temperature saturated flue gas is generally required to be installed in a flue.

The structure of the heat exchange device used at present is as follows: the heat exchange device comprises two end plates which are distributed left and right, wherein a plurality of heat exchange circular pipes are supported between the two end plates from top to bottom in parallel at intervals, all the heat exchange circular pipes are connected end to end through a plurality of elbows to form a plurality of independent parallel snake-shaped heat exchange pipelines, inlets of all the snake-shaped heat exchange pipelines are communicated with a water inlet header, and outlets of all the snake-shaped heat exchange pipelines are communicated with a water outlet header. The heat exchange device has the following disadvantages: (1) because the number of the elbows is large, the welding of the elbows is long in time consumption and high in labor intensity of workers, and the welding defects of welded junctions easily exist, so that the use safety of the heat exchanger is influenced; (2) because the number of the elbows is large, the heat exchange medium in the heat exchanger is easy to generate rotational flow when flowing through each elbow in the tube pass, so that the heat exchange tube can generate violent shaking during working, and the use stability of the heat exchanger is influenced; vibration can also aggravate friction between the heat exchange tube and the bracket, leakage hidden danger exists, and the service life of the heat exchanger can be shortened; (3) the heat exchanger is only provided with one water inlet header and one water outlet header, when the water inlet header or the water outlet header fails, the heat exchanger needs to be shut down and overhauled, and the online overhaul of the heat exchanger cannot be realized; (4) and the circular heat exchange tube is adopted, so that the heat exchange efficiency is poor.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a can improve heat exchange efficiency's high-efficient flue gas heat transfer device.

In order to achieve the above purpose, the utility model adopts the following technical scheme: high-efficient flue gas heat transfer device, be provided with the import including the front end, the rear end is provided with the heat transfer casing of export, by preceding interval distribution in proper order after to have a plurality of rows of spiral flat tube heat exchange module group in the heat transfer casing, each spiral flat tube heat exchange module group makes the inside heliciform flue gas runner that forms of heat transfer casing, every row of spiral flat tube heat exchange module group is by a plurality of from the top down stack gradually fixed spiral flat tube heat exchange module group together and constitute, every spiral flat tube heat exchange module's structure includes: the module frame comprises a top plate, a bottom plate, two side end plates and a middle bracket, wherein the front side and the rear side of the module frame are open, a plurality of rows of spiral flat tubes are sequentially supported between the two side end plates of the module frame from front to back, each spiral flat tube enables the inside of the module frame to form a spiral smoke gas flow channel, each two rows of spiral flat tubes form a heat exchange tube group, a plurality of header groups positioned outside a heat exchange shell are arranged on the outer side of one side end plate of the module frame, each header group comprises a drainage header and a steam inlet header, each heat exchange tube group corresponds to one header group, the pipe end of one row of spiral flat tubes in each heat exchange tube group is hermetically communicated with the steam inlet header of the corresponding header group, one side of the pipe end of the other row of spiral flat tubes in each heat exchange tube group is hermetically communicated with the drainage header of the corresponding header group, and the pipe end of the other row of spiral flat tubes in each heat exchange tube group and the pipe end of the other row of spiral flat tubes in the heat exchange tube group are communicated with the other through a plurality of spiral bends The steam inlet branch pipes are communicated in series with each other, the side wall of the upper part of the steam inlet header of each header group is provided with an inlet, the inlet of the steam inlet header of each header group is communicated with a steam inlet branch pipe positioned outside the heat exchange shell through a steam inlet connecting pipe, one end of each steam inlet branch pipe is closed, the other end of each steam inlet branch pipe is open, and the open end of each steam inlet branch pipe is provided with a steam inlet pipe flange for butting a pipeline; an outlet is arranged on the side wall of the lower part of the drainage header of each header group, the outlet of the drainage header of each header group is simultaneously communicated with a drainage branch pipe positioned outside the heat exchange shell through a drainage connecting pipe, one end of each drainage branch pipe is closed, the other end of each drainage branch pipe is open, and a drainage pipe flange for butting a pipeline is arranged at the open end of each drainage branch pipe; the steam inlet branch pipe of each spiral flat pipe heat exchange module in each row of spiral flat pipe heat exchange module groups is respectively communicated with one end of a steam inlet connecting pipe with a valve through a steam inlet pipe flange, the other ends of all the steam inlet connecting pipes are simultaneously communicated with a steam inlet main pipe positioned outside the heat exchange shell, the drain branch pipe of each spiral flat pipe heat exchange module in each row of spiral flat pipe heat exchange module groups is respectively communicated with one end of a drain connecting pipe with a valve through a drain pipe flange, and the other ends of all the drain connecting pipes are simultaneously communicated with a drain main pipe positioned outside the heat exchange shell.

Further, aforementioned high-efficient flue gas heat transfer device, wherein: an inlet horn with the caliber gradually increasing from front to back is arranged at the inlet of the heat exchange shell, and an outlet horn with the caliber gradually decreasing from front to back is arranged at the outlet of the heat exchange shell.

Further, aforementioned high-efficient flue gas heat transfer device, wherein: all the spiral flat tubes in each spiral flat tube heat exchange module are mutually supported by keeping point contact between the spiral outer edges of the spiral flat tubes and the edges of the middle bracket holes.

Further, aforementioned high-efficient flue gas heat transfer device, wherein: the structure of admission header includes: the steam inlet header comprises a steam inlet header body with a U-shaped cross section and a steam inlet header sealing plate for sealing the open end of the steam inlet header body, wherein a side plate of the steam inlet header body is provided with a first through hole for inserting a spiral flat pipe, and an inlet communicated with a steam inlet branch pipe is arranged on the upper side wall of the steam inlet header sealing plate.

Further, aforementioned high-efficient flue gas heat transfer device, wherein: the structure of the hydrophobic header comprises: the drainage header body with the U-shaped cross section and the drainage header sealing plate for sealing the open end of the drainage header body are provided with second through holes for inserting spiral flat pipes on a side plate of the drainage header body, and outlets communicated with the drainage branch pipes are arranged on the side wall of the lower part of the drainage header sealing plate.

Further, aforementioned high-efficient flue gas heat transfer device, wherein: the upper part of the end plate is provided with a plurality of lifting holes convenient for lifting.

Further, aforementioned high-efficient flue gas heat transfer device, wherein: and the module frame is provided with sealing plate reinforcing flat steel for reinforcing, end plate reinforcing flat steel and diagonal braces.

Further, aforementioned high-efficient flue gas heat transfer device, wherein: each steam inlet connecting pipe and each drainage connecting pipe are respectively provided with a valve for opening and closing the corresponding connecting pipe.

Further, aforementioned high-efficient flue gas heat transfer device, wherein: an elbow cover used for covering all elbows is arranged outside the module frame at the elbow side, and a header cover used for covering all headers is arranged outside the module frame at the header side.

Through the implementation of the above technical scheme, the beneficial effects of the utility model are that: (1) the headers replace the elbows, so that the number of the elbows is reduced, the heat exchange medium in the heat exchanger flows more stably in a tube pass, the shaking degree of the heat exchange tube during working is reduced, and the running stability of the heat exchanger is improved; the friction between the heat exchange tube and the bracket is reduced, the leakage hidden danger is eliminated, and the effective service life of the heat exchanger is prolonged; (2) the header replaces the elbow, so that the number of the elbows is reduced, the elbow welding operation is reduced, and the labor intensity of workers is reduced; (3) the assembly is convenient, the on-line maintenance of the faulty header group can be realized, the whole heat exchanger does not need to be shut down, and the working efficiency is improved; (4) after the spiral flat tube is adopted, the heat exchange medium spirally flows in the spiral flat tube, and the speed and the direction of the heat exchange medium are periodically changed under the action of centrifugal force during spiral flow, so that the longitudinal mixing of the heat exchange medium is enhanced, the turbulence degree of the heat exchange medium is improved, the heat transfer in the tube is enhanced, and the heat exchange efficiency of the heat exchanger is improved; (5) after the spiral flat pipe is adopted, a spiral flue gas flow channel is formed in the heat exchange module, and the speed and the direction of flue gas are periodically changed due to the inertia effect when the flue gas flows along the spiral flue gas flow channel, so that the collision contact between the flue gas and the spiral flat pipe is enhanced, and the heat exchange efficiency is improved; (6) and because no baffle plate is arranged in the spiral flue gas flow channel formed by the spiral flat tubes, the pressure drop is reduced, the operation vibration is reduced, the flowing blind area is eliminated, and the tube shell stroke is not easy to scale due to the action of scouring inertia.

Drawings

Fig. 1 is a schematic structural view of the high-efficiency flue gas heat exchange device of the present invention.

Fig. 2 is a schematic structural view in a top view of fig. 1.

Fig. 3 is a schematic structural diagram of the spiral flat tube heat exchange module group shown in fig. 1.

Fig. 4 is a schematic structural view of the spiral flat tube heat exchange module shown in fig. 1.

Fig. 5 is a schematic view of the elbow cover, header cover and bottom plate of fig. 4 shown in a bottom view.

Fig. 6 is a schematic structural view of fig. 4 with the elbow cover hidden in the left view.

Fig. 7 is a schematic structural view of fig. 4 with the header cover hidden in the right view.

FIG. 8 is a schematic view showing the connection relationship between the steam inlet header, the drain header, the steam inlet branch pipe, and the drain branch pipe shown in FIG. 7.

Fig. 9 is a structural schematic view of an intake manifold body of the intake manifold shown in fig. 8.

FIG. 10 is a schematic view of the steam intake manifold closure plate of the steam intake manifold shown in FIG. 8.

Fig. 11 is a schematic structural view of a hydrophobic header body of the hydrophobic header shown in fig. 8.

Fig. 12 is a schematic view of the hydrophobic header closure plate of the hydrophobic header shown in fig. 8.

Fig. 13 is a schematic perspective view of fig. 4.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, and a particular orientation configuration and operation, and thus should not be construed as limiting the present invention.

As shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8, fig. 9, fig. 10, fig. 11, fig. 12, and fig. 13, the high-efficiency flue gas heat exchange device includes a heat exchange housing 111 having an inlet at the front end and an outlet at the rear end, wherein a plurality of rows of spiral flat tube heat exchange module groups 112 are sequentially distributed in the heat exchange housing 111 from front to back at intervals, and in this embodiment, two rows of spiral flat tube heat exchange module groups 112 are sequentially distributed in the heat exchange housing 111 from front to back at intervals; each spiral flat tube heat exchange module group 112 makes the inside heliciform flue gas runner that forms of heat transfer casing, every row of spiral flat tube heat exchange module group 112 by a plurality of from the top down stack gradually fixed spiral flat tube heat exchange module 113 together and constitute, in this embodiment, every row of spiral flat tube heat exchange module group 112 by three from the top down stack gradually fixed spiral flat tube heat exchange module 113 together and constitute, every spiral flat tube heat exchange module 113's structure includes: a module frame which is enclosed by a top plate 1, a bottom plate 2, two side end plates 3 and a middle bracket 31 and is opened at the front and the back sides, a plurality of rows of spiral flat tubes 4 are sequentially supported between the two side end plates 3 of the module frame from front to back, each spiral flat tube 4 enables the interior of the module frame to form a spiral smoke gas flow passage, each two rows of spiral flat tubes 4 form a heat exchange tube group, a plurality of header groups which are positioned outside a heat exchange shell 111 are arranged outside the end plate 3 at one side of the module frame, each header group comprises a drainage header 5 and a steam inlet header 6, each heat exchange tube group corresponds to one header group, the pipe end at one side of one row of spiral flat tubes 4 in each heat exchange tube group is hermetically communicated with the steam inlet header 6 of the corresponding header group, and the pipe end at one side of the other row of spiral flat tubes 4 in each heat exchange tube group is hermetically communicated with the drainage header 5 of the corresponding header group, the other side pipe end of one row of spiral flat pipes 4 in each heat exchange pipe set is connected in series with the other side pipe end of the other row of spiral flat pipes in the heat exchange pipe set in pairs through a plurality of bends 7, an inlet 8 is arranged on the side wall of the upper part of a steam inlet header 6 of each header set, the inlet 8 of the steam inlet header 6 of each header set is respectively communicated with a steam inlet branch pipe 10 positioned outside a heat exchange shell 111 through a steam inlet connecting pipe 9, one end of the steam inlet branch pipe 10 is closed, the other end of the steam inlet branch pipe 10 is open, and a steam inlet pipe flange 11 for butting a pipeline is arranged at the open end of the steam inlet branch pipe 10; an outlet 12 is arranged on the side wall of the lower part of the drainage header 5 of each header group, the outlet 12 of the drainage header 5 of each header group is respectively communicated with a drainage branch pipe 14 positioned outside the heat exchange shell 111 through a drainage connecting pipe 13, one end of each drainage branch pipe 14 is closed, the other end of each drainage branch pipe is open, and a drainage pipe flange 15 for butting a pipeline is arranged at the open end of each drainage branch pipe 14; the steam inlet branch pipe 10 of each spiral flat pipe heat exchange module 113 in each row of spiral flat pipe heat exchange module group 112 is respectively communicated with one end of a steam inlet connecting pipe 115 with a first valve 114 through a steam inlet pipe flange 11, the other ends of all the steam inlet connecting pipes 115 are simultaneously communicated with a steam inlet header pipe 116 positioned outside the heat exchange shell 111, the drain branch pipe 14 of each spiral flat pipe heat exchange module 113 in each row of spiral flat pipe heat exchange module group 112 is respectively communicated with one end of a drain connecting pipe 118 with a second valve 117 through a drain pipe flange 15, and the other ends of all the drain connecting pipes 118 are simultaneously communicated with a drain header pipe 119 positioned outside the heat exchange shell 111;

in this embodiment, an inlet horn 120 with an aperture gradually increasing from front to back is arranged at an inlet of the heat exchange shell 111, and after the flue gas enters the heat exchange shell 111 through the inlet horn 120, the flue gas flow velocity of the flue gas is reduced, so that the heat exchange time between the flue gas and each spiral flat tube is prolonged, and further the heat exchange efficiency is improved; in this embodiment, all the spiral flat tubes in each spiral flat tube heat exchange module 113 are supported by maintaining point contact between the spiral outer edge of the spiral flat tube and the edge of the middle bracket hole, so that fluid induced vibration can be effectively reduced, pressure drop can be effectively reduced, and heat exchange efficiency of the heat exchanger can be improved;

in the present embodiment, the structure of the steam intake header 6 includes: the steam inlet header comprises a steam inlet header body 61 with a U-shaped cross section and a steam inlet header sealing plate 62 for sealing the open end of the steam inlet header body 61, wherein a side plate of the steam inlet header body 61 is provided with a first through hole 63 for inserting the spiral flat pipe 4, and an inlet 8 communicated with the steam inlet branch pipe 10 is arranged on the upper side wall of the steam inlet header sealing plate 62; in the present embodiment, the structure of the drain header 5 includes: the drainage header comprises a drainage header body 51 with a U-shaped cross section and a drainage header sealing plate 52 for sealing the open end of the drainage header body 51, wherein a second through hole 53 for inserting the spiral flat tube 4 is formed in a side plate of the drainage header body 51, and an outlet communicated with the drainage branch tube 14 is formed in the side wall of the lower part of the drainage header sealing plate 52;

in the embodiment, a plurality of lifting holes 16 convenient for lifting are arranged at the upper part of the end plate 3; in this embodiment, the module frame is provided with a sealing plate reinforcing flat steel 17, an end plate reinforcing flat steel 18 and an inclined strut 19 for reinforcement, so that the overall strength of the spiral flat tube heat exchange module can be increased, and the use safety of the heat exchanger is further improved; in this embodiment, each of the steam inlet connection pipes 9 and each of the drain connection pipes 13 is provided with a third valve 20 for opening and closing the corresponding connection pipe,

thus, when a certain one of the header groups of a certain spiral flat tube heat exchange module 113 in a certain row of spiral flat tube heat exchange module group 112 fails, by closing the third valve 20 on the steam inlet connection pipe 9 communicating with the steam inlet header 6 in the faulty header group and simultaneously closing the third valve 20 on the water drain connection pipe 13 communicating with the water drain header 5 in the faulty header group, therefore, the on-line maintenance of the faulty header group is realized, the whole heat exchanger does not need to be shut down, the working efficiency is improved, the first valve 114 on the steam inlet connecting pipe 115 corresponding to the faulty spiral flat tube heat exchange module 113 can be closed, and the second valve 117 on the drain connecting pipe 118 corresponding to the faulty spiral flat tube heat exchange module 113 can be closed at the same time, therefore, the on-line maintenance of the faulty header group is realized, the whole heat exchanger does not need to be shut down, and the working efficiency is improved;

in the embodiment, the elbow cover 21 for covering all the elbows 7 is arranged outside the module frame at the elbow side, and the header cover 22 for covering all the headers is arranged outside the module frame at the header side, so that the elbows and all the headers can be better protected, and the service life of the heat exchanger is prolonged;

when the heat exchanger works, low-temperature flue gas enters the heat exchange shell 111 through the inlet trumpet 120, the flue gas entering the heat exchange shell 111 passes through each spiral flat tube heat exchange module group 112 to form a spiral flue gas flow channel and then is discharged into the outlet trumpet 121, then is discharged out of the heat exchange shell 111 through the outlet trumpet 121, high-temperature steam is introduced into the steam inlet main pipe 116 in the process that the flue gas spirally flows through each spiral flat tube 4 in the flue gas flow channel, the high-temperature steam in the steam inlet main pipe 116 is distributed to each steam inlet branch pipe 10 through each steam inlet connecting pipe 115 and the steam inlet pipe flange 11, the high-temperature steam entering the steam inlet branch pipes 10 is distributed into each steam inlet header 6 through each steam inlet connecting pipe 9 and the inlet 8, the high-temperature steam in each steam inlet header 6 enters the corresponding spiral flat tube 4, the high-temperature flue gas spirally flows in the spiral flat tubes 4, and the high-temperature steam and the low-temperature flue gas which also spirally flows in the spiral flow channel can exchange heat when flowing through each spiral flat tube 4, therefore, the flue gas is heated, the heat exchange of the flue gas is carried out to form high-temperature flue gas, condensed water formed after the heat exchange of the high-temperature flue gas enters each drainage header 5, the condensed water in each drainage header 5 is converged into the drainage branch pipes 14 through each drainage connecting pipe 13, is discharged into the drainage main pipe 119 through each drainage pipe flange 15 and the drainage connecting pipe 118, and is discharged through the drainage main pipe.

The utility model has the advantages that: (1) the headers replace the elbows, so that the number of the elbows is reduced, the heat exchange medium in the heat exchanger flows more stably in a tube pass, the shaking degree of the heat exchange tube during working is reduced, and the running stability of the heat exchanger is improved; the friction between the heat exchange tube and the bracket is reduced, the leakage hidden danger is eliminated, and the effective service life of the heat exchanger is prolonged; (2) the header replaces the elbow, so that the number of the elbows is reduced, the elbow welding operation is reduced, and the labor intensity of workers is reduced; (3) the assembly is convenient, the on-line maintenance of the faulty header group can be realized, the whole heat exchanger does not need to be shut down, and the working efficiency is improved; (4) after the spiral flat tube is adopted, the heat exchange medium spirally flows in the spiral flat tube, and the speed and the direction of the heat exchange medium are periodically changed under the action of centrifugal force during spiral flow, so that the longitudinal mixing of the heat exchange medium is enhanced, the turbulence degree of the heat exchange medium is improved, the heat transfer in the tube is enhanced, and the heat exchange efficiency of the heat exchanger is improved; (5) after the spiral flat pipe is adopted, a spiral flue gas flow channel is formed in the heat exchange module, and the speed and the direction of flue gas are periodically changed due to the inertia effect when the flue gas flows along the spiral flue gas flow channel, so that the collision contact between the flue gas and the spiral flat pipe is enhanced, and the heat exchange efficiency is improved; (6) and because no baffle plate is arranged in the spiral flue gas flow channel formed by the spiral flat tubes, the pressure drop is reduced, the operation vibration is reduced, the flowing blind area is eliminated, and the tube shell stroke is not easy to scale due to the action of scouring inertia.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any modifications or equivalent changes made in accordance with the technical spirit of the present invention are also within the scope of the present invention.

Claims (9)

1. High-efficient flue gas heat transfer device, its characterized in that: be provided with the import including the front end, the rear end is provided with the heat transfer casing of export, by preceding interval distribution in proper order after to in the heat transfer casing have a plurality of rows of spiral flat tube heat exchange module group, each spiral flat tube heat exchange module group makes the inside heliciform flue gas runner that forms of heat transfer casing, every row of spiral flat tube heat exchange module group is by a plurality of from the top down range upon range of fixed spiral flat tube heat exchange module group together in proper order, every spiral flat tube heat exchange module's structure includes: the module frame comprises a top plate, a bottom plate, two side end plates and a middle bracket, wherein the front side and the rear side of the module frame are open, a plurality of rows of spiral flat tubes are sequentially supported between the two side end plates of the module frame from front to back, each spiral flat tube enables the inside of the module frame to form a spiral smoke gas flow channel, each two rows of spiral flat tubes form a heat exchange tube group, a plurality of header groups positioned outside a heat exchange shell are arranged on the outer side of one side end plate of the module frame, each header group comprises a drainage header and a steam inlet header, each heat exchange tube group corresponds to one header group, the pipe end of one row of spiral flat tubes in each heat exchange tube group is hermetically communicated with the steam inlet header of the corresponding header group, one side of the pipe end of the other row of spiral flat tubes in each heat exchange tube group is hermetically communicated with the drainage header of the corresponding header group, and the pipe end of the other row of spiral flat tubes in each heat exchange tube group and the pipe end of the other row of spiral flat tubes in the heat exchange tube group are communicated with the other through a plurality of spiral bends The steam inlet branch pipes are communicated in series with each other, the side wall of the upper part of the steam inlet header of each header group is provided with an inlet, the inlet of the steam inlet header of each header group is communicated with a steam inlet branch pipe positioned outside the heat exchange shell through a steam inlet connecting pipe, one end of each steam inlet branch pipe is closed, the other end of each steam inlet branch pipe is open, and the open end of each steam inlet branch pipe is provided with a steam inlet pipe flange for butting a pipeline; an outlet is arranged on the side wall of the lower part of the drainage header of each header group, the outlet of the drainage header of each header group is simultaneously communicated with a drainage branch pipe positioned outside the heat exchange shell through a drainage connecting pipe, one end of each drainage branch pipe is closed, the other end of each drainage branch pipe is open, and a drainage pipe flange for butting a pipeline is arranged at the open end of each drainage branch pipe; the steam inlet branch pipe of each spiral flat pipe heat exchange module in each row of spiral flat pipe heat exchange module groups is respectively communicated with one end of a steam inlet connecting pipe with a valve through a steam inlet pipe flange, the other ends of all the steam inlet connecting pipes are simultaneously communicated with a steam inlet main pipe positioned outside the heat exchange shell, the drain branch pipe of each spiral flat pipe heat exchange module in each row of spiral flat pipe heat exchange module groups is respectively communicated with one end of a drain connecting pipe with a valve through a drain pipe flange, and the other ends of all the drain connecting pipes are simultaneously communicated with a drain main pipe positioned outside the heat exchange shell.

2. The high-efficiency flue gas heat exchange device of claim 1, wherein: an inlet horn with the caliber gradually increasing from front to back is arranged at the inlet of the heat exchange shell, and an outlet horn with the caliber gradually decreasing from front to back is arranged at the outlet of the heat exchange shell.

3. The high-efficiency flue gas heat exchange device of claim 1 or 2, wherein: all the spiral flat tubes in each spiral flat tube heat exchange module are mutually supported by keeping point contact between the spiral outer edges of the spiral flat tubes and the edges of the middle bracket holes.

4. The high-efficiency flue gas heat exchange device of claim 1 or 2, wherein: the structure of admission header includes: the steam inlet header comprises a steam inlet header body with a U-shaped cross section and a steam inlet header sealing plate for sealing the open end of the steam inlet header body, wherein a side plate of the steam inlet header body is provided with a first through hole for inserting a spiral flat pipe, and an inlet communicated with a steam inlet branch pipe is arranged on the upper side wall of the steam inlet header sealing plate.

5. The high-efficiency flue gas heat exchange device of claim 1 or 2, wherein: the structure of the hydrophobic header comprises: the drainage header body with the U-shaped cross section and the drainage header sealing plate for sealing the open end of the drainage header body are provided with second through holes for inserting spiral flat pipes on a side plate of the drainage header body, and outlets communicated with the drainage branch pipes are arranged on the side wall of the lower part of the drainage header sealing plate.

6. The high-efficiency flue gas heat exchange device of claim 1 or 2, wherein: the upper part of the end plate is provided with a plurality of lifting holes convenient for lifting.

7. The high-efficiency flue gas heat exchange device of claim 1 or 2, wherein: and the module frame is provided with sealing plate reinforcing flat steel for reinforcing, end plate reinforcing flat steel and diagonal braces.

8. The high-efficiency flue gas heat exchange device of claim 1 or 2, wherein: each steam inlet connecting pipe and each drainage connecting pipe are respectively provided with a valve for opening and closing the corresponding connecting pipe.

9. The high-efficiency flue gas heat exchange device of claim 1 or 2, wherein: an elbow cover used for covering all elbows is arranged outside the module frame at the elbow side, and a header cover used for covering all headers is arranged outside the module frame at the header side.

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