CN219037679U - Flue gas heat collector - Google Patents

Abstract

The utility model discloses a flue gas heat collector, which comprises an inlet smoke box, a shell, a heat exchange part, an outlet smoke box, an inlet main pipe, an outlet main pipe and a rotary blowing device, wherein the inlet smoke box and the outlet smoke box are positioned at two ends of the shell; the heat exchange tube assemblies of the first part of the plurality of heat exchange tube assemblies are communicated with the inlet header pipe, and the heat exchange tube assemblies of the second part of the plurality of heat exchange tube assemblies are communicated with the outlet header pipe; the rotary blowing device is positioned in the housing to disturb the deposited dust. The flue gas heat collector disclosed by the utility model improves the heat exchange efficiency of the flue gas heat exchanger.

Description

Flue gas heat collector

Technical Field

The utility model relates to the technical field of heat exchange, in particular to a flue gas heat collector.

Background

The low-temperature electric dust removal technology is widely popularized and applied in ultralow emission modification of coal-fired units and newly-built units in recent years in China, and the low-temperature economizer is used as a specific flue gas heat exchanger, so that not only can the flue gas waste heat be effectively recycled, but also the dust removal efficiency can be effectively improved and the sulfur trioxide in the flue gas can be cooperatively trapped before the electric dust remover, and the technology is a flue gas heat extraction and energy-saving environment-friendly technology which is very in line with national policies.

Because the flue gas often contains a large amount of dust, the dust is easy to accumulate on the flue gas heat exchanger, so that the heat exchange efficiency of the flue gas heat exchanger is affected.

Disclosure of Invention

In order to solve the technical problems, the utility model provides a flue gas heat collector, comprising: an inlet smoke box, a shell, a heat exchange part, an outlet smoke box, an inlet main pipe, an outlet main pipe and a rotary blowing device,

the inlet smoke box and the outlet smoke box are positioned at two ends of the shell;

the heat exchange part comprises a plurality of heat exchange tube assemblies, the lower parts of the heat exchange tube assemblies are positioned in the shell, the upper parts of the heat exchange tube assemblies are positioned outside the shell, and the upper parts of the plurality of heat exchange tube assemblies are communicated;

a first portion of the plurality of heat exchange tube assemblies is in communication with the inlet manifold, and a second portion of the plurality of heat exchange tube assemblies is in communication with the outlet manifold;

the rotary blowing device is positioned in the housing to disturb the deposited dust.

Optionally, the flue gas heat collector further includes: the dust flow uniform distribution unit,

the dust flow uniform distribution unit is positioned in a flue inside the inlet smoke box and/or in front of the inlet smoke box, and comprises a plurality of streamline current conductors.

Optionally, the heat exchange part comprises a plurality of baffles and at least one heat exchange module, the heat exchange module comprises a plurality of rows of heat exchange tube assemblies, and one row of heat exchange tube assemblies comprises a plurality of heat exchange tube assemblies which are sequentially arranged along a first direction; the heat exchange tube assembly comprises a heat tube and an outer sleeve, a part of each heat tube is inserted into the corresponding outer sleeve, the upper end of the outer sleeve is in closed connection with the heat tube, and the lower end of the outer sleeve is in closed connection with the partition plate;

the partition plate extends along the first direction, and the heat pipes of the heat exchange pipe assemblies of each row of heat exchange pipe assemblies penetrate through one partition plate;

the inlet pipes of the heat exchange modules at the forefront row are all communicated with the inlet header pipe, the outlet pipes of the heat exchange modules at the last row are all communicated with the outlet header pipe, and cooling water can flow between the inner wall of the outer sleeve pipe and the outer wall of the corresponding heat pipe; in each row of heat exchange tube assemblies, the outer sleeves are sequentially and alternately communicated up and down along the first direction through first connecting pipes.

Optionally, the rotary blowing device is located at the bottom of the heat exchange module or the bottom of the shell, and the blowing direction of the rotary blowing device faces to the top of the shell.

Optionally, the plurality of streamline flow conductors are arranged on the inner wall of the inlet smoke box and/or in a flue in front of the inlet smoke box.

Optionally, the first connecting pipe includes connecting pipe and lower connecting pipe, it is adjacent to go up connecting pipe intercommunication the upper end of outer tube, lower connecting pipe intercommunication is adjacent the lower extreme of outer tube, lower connecting pipe with the baffle is connected, forms confined pipeline.

Optionally, the flue gas heat collector further includes: and the heating device can heat working medium in the heat pipe.

Optionally, the outer wall of a portion of the heat pipe not inserted into the outer sleeve is provided with a plurality of fins.

Optionally, the fins are cogged fins or spiral fins.

Optionally, the tooth-forming fins are spirally or parallelly arranged on the heat pipe along the extending direction of the heat pipe.

The utility model relates to a flue gas heat collector, which comprises an inlet smoke box, a shell, a heat exchange part, an outlet smoke box, an inlet main pipe, an outlet main pipe and a rotary blowing device, wherein the inlet smoke box and the outlet smoke box are positioned at two ends of the shell; the heat exchange tube assemblies of the first part of the plurality of heat exchange tube assemblies are communicated with the inlet header pipe, and the heat exchange tube assemblies of the second part of the plurality of heat exchange tube assemblies are communicated with the outlet header pipe; the rotary blowing device is positioned in the housing to disturb the deposited dust. The smoke gas heat collector disclosed by the utility model sprays smoke dust through the rotary spraying device, so that the smoke dust is discharged along with the smoke gas, the accumulation of the dust on the smoke gas heat exchanger is effectively reduced, and the heat exchange efficiency of the smoke gas heat exchanger is improved.

Drawings

FIG. 1 is a schematic diagram of a flue gas heat collector according to an embodiment of the present utility model;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a top view of a rotary blowing apparatus;

FIG. 4 is a schematic illustration of one of the heat exchange tube assemblies of FIG. 1;

FIG. 5 is a schematic view of the upper heat exchange portion of the housing of FIG. 1;

FIG. 6 is a schematic view of the upper portion of one of the heat exchange modules of FIG. 5;

FIG. 7 is a schematic cross-sectional view of the lower connecting tube and the baffle;

FIG. 8 is a schematic view of a trapezoidal separator;

FIG. 9 is a schematic perspective view of a heat pipe provided with U-shaped scalloped fins;

FIG. 10 is a radial cross-sectional view of a heat pipe provided with U-shaped scalloped fins;

FIG. 11 is a radial cross-sectional view of a heat pipe provided with V-shaped notched fins;

FIG. 12 is a schematic view of an notched fin on a heat pipe;

FIG. 13 is a schematic view of another notched fin on a heat pipe;

FIG. 14 is a schematic view of yet another notched fin on a heat pipe;

FIG. 15 is a schematic illustration of the flow of working fluid within a vertically disposed heat pipe;

FIG. 16 is a schematic illustration of the flow of working fluid within a diagonally disposed heat pipe.

The reference numerals in fig. 1-16 are illustrated as follows:

101-an inlet smoke box; 102-a housing; 103-outlet smoke box; 108-a heating device; 110-a rotary blowing device; 110 a-a rotary blowing unit; 110 b-a mouthpiece;

20-ash removing unit;

30-a heat exchange module; 301-an inlet pipe; 302-outlet tube; 303-a heat exchange tube assembly; 303 a-an outer sleeve; 303 b-heat pipe; 303 c-welding spots; 303 ba-liquid film; 303b 1-condensing section; 303b 2-evaporation section; 303b 3-fins; 304-a separator; 305 a-upper connection tube; 305 b-lower connection tube; 306-a water drain pipe;

40-an online temperature measurement unit;

50-an intelligent control unit;

601-an inlet header; 602-outlet header;

70-a second connecting tube;

80-dust flow uniform distribution unit.

Detailed Description

In order to make the technical solution of the present utility model better understood by those skilled in the art, the present utility model will be further described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1-2, fig. 1 is a schematic structural diagram of an embodiment of a flue gas heat collector according to the present utility model; FIG. 2 is a top view of FIG. 1; fig. 4 is a schematic view of one heat exchange tube assembly 303 of fig. 1.

As shown in fig. 1, the flue gas heat collector comprises: an inlet plenum 101, a housing 102, a heat exchange section, an outlet plenum 103, an inlet manifold 601, an outlet manifold 602, and a rotary blowing device 110.

Inlet smoke box 101 and outlet smoke box 103 are located at both ends of housing 102.

The flue gas enters the housing 102 through the inlet smoke box 101 and exits through the outlet smoke box 103.

The heat exchange part comprises a plurality of heat exchange tube assemblies 303, the lower parts of the heat exchange tube assemblies 303 are positioned in the shell 102, the upper parts of the heat exchange tube assemblies 303 are positioned outside the shell 102, and the upper parts of the plurality of heat exchange tube assemblies 303 are communicated;

a first portion of the heat exchange tube assemblies 303 of the plurality of heat exchange tube assemblies 303 are in communication with the inlet manifold 601 and a second portion of the heat exchange tube assemblies 303 of the plurality of heat exchange tube assemblies 303 are in communication with the outlet manifold 602.

Wherein the lower portion of the heat exchange tube assembly 303 is positioned within the housing 102 to absorb heat from the flue gas and conduct the heat to the upper portion of the heat exchange tube assembly 303.

In this case, since the upper portions of the plurality of heat exchange tube assemblies 303 are communicated, the cooling water can flow through the upper portions of the plurality of heat exchange tube assemblies 303. It will be appreciated that cooling water may first enter the first portion of the heat exchange tube assemblies 303 through the inlet manifold 601, then flow through the first portion of the heat exchange tube assemblies 303 to the other heat exchange tube assemblies 303, and finally flow through the second portion of the heat exchange tube assemblies 303 to the outlet manifold 602 to complete the heat extraction. Wherein the heat exchange tube assemblies 303 of the first portion may be one or more heat exchange tube assemblies 303 in direct communication with the inlet manifold 601 or in the shortest communication path with the inlet manifold 601. The second portion of the heat exchange tube assemblies 303 may be one or more heat exchange tube assemblies 303 that are in direct communication with the outlet manifold 602 or have the shortest communication path with the outlet manifold 602.

The flue gas heat collector can be arranged on a flue gas channel of flue gas waste heat and is used for recovering the flue gas waste heat.

Optionally, the flue gas heat collector may further include: the dust flow distribution unit 80, the dust flow distribution unit 80 is located in the flue inside the inlet smoke box 101 and/or before the inlet smoke box 101, and in particular, the streamline flow guide body may be welded inside the inlet smoke box 101. The dust flow uniform distribution unit 80 includes a plurality of streamline flow guide bodies; optionally, a plurality of streamlined flow conductors are arranged on the inner wall of the inlet smoke box 101 and/or in the flue before the inlet smoke box 101. Optionally, the bottom of streamlined baffle and the inner wall fixed connection of import smoke box 101, the top of streamlined baffle stretches into the inner space of import smoke box 101, and streamlined baffle is crooked form in first direction to rectify the flue gas, improve the effect of flow equalizing of flue gas. The first direction may be a flue gas flow direction.

Referring to fig. 2, the thickness of the end of the streamline flow guide body in the dust flow uniform distribution unit 80, which is close to the flue, is adjusted according to the specific flow field simulation result.

Optionally, the utility model can adopt a water drop streamline flow guide body to conform to the spatial change of the smoke box flow channel, and realize the effect of double uniform distribution of two-phase dust flow of smoke flow and dust particle flow.

In other embodiments, the dust flow uniformly distributing unit 80 may be formed by a multi-directional folded plate assembly and a water-drop streamline flow guiding body, and is combined with a plurality of triangular wings to realize the effect of dual uniform distribution of dust flow two-phase flow of the flue gas flow and the dust particle flow.

The dust flow uniform distribution unit 80 is beneficial to realizing the uniform flow of the flue gas, so that the flue gas uniformly flows to the lower part of the heat pipe 303b of the heat exchange part, and the heat exchange efficiency is improved.

Optionally, the flue gas heat extractor comprises a heat exchange section comprising a plurality of baffles 304 and at least one heat exchange module 30, the heat exchange section comprising ten heat exchange modules 30 as shown in fig. 2. The heat exchange module 30 includes a plurality of rows of heat exchange tube assemblies 303, wherein a row of heat exchange tube assemblies 303 includes a plurality of heat exchange tube assemblies 303 arranged in sequence, and the arrangement direction of the row of heat exchange tube assemblies 303 is defined herein as a first direction, which may be a left-right direction as shown in fig. 2, and the arrangement direction of the plurality of rows of heat exchange tube assemblies 303 is defined as a second direction, i.e., an up-down direction in fig. 2.

Alternatively, as shown in fig. 4, one heat exchange tube assembly 303 includes one heat pipe 303b and one outer jacket 303a, with a portion of each heat pipe 303b (e.g., a portion of the heat pipe 303b in the region a shown in fig. 1) inserted into the corresponding outer jacket 303a. As shown in fig. 4, the upper end of the outer sleeve 303a is in closed connection with the heat pipe 303b, the lower end of the outer sleeve 303a is in closed connection with the partition 304, and as shown in fig. 4, a cooling cavity is formed between the inner wall of the outer sleeve 303a and the outer wall of the corresponding heat pipe 303b, and cooling water can flow through the cooling cavity. As shown in fig. 4, the length of the heat pipe 303b is greater than the length of the outer sleeve 303a, the lower part of the heat pipe 303b is positioned in the housing 102 of the flue gas heat extractor, and the upper part of the heat pipe 303b is positioned above the housing 102. As shown in fig. 1, the heat pipe 303b in the region a is located above the housing 102.

With continued reference to fig. 4, the upper ends of the heat pipe 303b and the outer sleeve 303a are preferably sealed by airtight welding (303 c is a welding spot), and with reference to fig. 4, the lower end of the outer sleeve 303a is preferably sealed by airtight welding with the partition 304, so that the sealing connection is reliable and easy to implement. Of course, other means of achieving a sealed connection are possible, such as providing a seal or the like. As shown in fig. 4, specifically, the upper end of the outer sleeve 303a may be an extruded conical closing structure, and the inner diameter of the conical closing structure is equal to or slightly larger than the outer diameter of the heat pipe 303b, so that the upper end of the outer sleeve 303a and the heat pipe 303b are easily pre-positioned after preliminary sleeving, and the connecting position is easily welded due to the close fit or the small gap between the conical closing structure and the outer wall of the heat pipe 303b after sleeving.

Meanwhile, as shown in fig. 4, a technician can directly see the position of the welding spot 303c from above, so that the welding position can be easily determined and welded, and the welding position can be checked and maintained.

As can be further understood with reference to fig. 5 and 6, fig. 5 is a schematic view of the upper heat exchanging portion of the housing 102 in fig. 1; fig. 6 is a schematic view of an upper portion of one of the heat exchange modules 30 of fig. 5.

In the view angle of the heat exchange module 30 in fig. 6, only the upper portion of a row of heat exchange tube assemblies 303 is shown, and the lower portion of the heat exchange tube assemblies 303b is not shown, in this embodiment, in each row of heat exchange tube assemblies 303, a plurality of outer sleeves 303a are sequentially and alternately connected up and down along the arrangement direction of the heat exchange tube assemblies 303 through first connecting tubes. As shown in fig. 5 and 6, the first connection pipe includes an upper connection pipe 305a and a lower connection pipe 305b. In each row of heat exchange tube assemblies 303, one outer tube 303a is connected at its upper end to the upper end of an adjacent outer tube 303a by an upper connection tube 305a and is connected at its lower end to the lower end of an adjacent outer tube 303a by a lower connection tube 305b. The outer sleeves 303a at two ends are connected in such a way that one end is communicated with the corresponding end of the adjacent outer sleeve 303a through a first connecting pipe, and the other end is used as an inlet or an outlet of cooling water. It can be seen that the upper connection pipe 305a communicates with the upper end of the adjacent outer sleeve 303a, and the lower connection pipe 305b communicates with the lower end of the adjacent outer sleeve 303a. In this way, the outer sleeves 303a of a row of heat exchange tube assemblies 303 are arranged side by side and are connected in series in an up-down alternating communication manner, a serpentine flow passage is formed for a row of heat exchange assemblies in fig. 6, the cooling water flow directions in the adjacent outer sleeves 303a are opposite, and arrows in fig. 6 indicate the cooling water flow directions.

Alternatively, the lower connection pipe 305b may be connected to the partition 304 to form a closed circuit. As shown in fig. 7, the cross section of the lower connection pipe 305b may be a semi-arc, and the lower connection pipe 305b is fastened to the partition 304 and is tightly connected through the welding point 303c, so that the cooling water may flow in a pipeline where the lower connection pipe 305b and the partition 304 form a closed. The lower connecting tube 305b and the adjacent outer sleeve have three advantages compared with a circular tube in this connection mode:

the advantages are 1, and the welding line is reduced by nearly 40%;

advantage 2, all welds at the bottom are male welds (top visible);

and 3, even if a weld defect occurs, the weld can be repaired on line.

So set up, heat exchange module 30 includes multirow heat exchange tube subassembly 303, and each heat exchange tube subassembly 303 forms snakelike labyrinth runner, and the cooling water flow direction is opposite in the outer tube 303a of adjacent heat exchange tube subassembly 303, improves relative difference in temperature to can effectively improve heat exchange ability.

In addition, as shown in fig. 1, the flue gas enters and leaves the flue gas heat collector from left to right, and the cooling water can flow into and out of the heat exchange part from right to left, namely the flowing direction of the flue gas is completely opposite to the overall flowing direction of the cooling water, and the cooling water is in a countercurrent state to the flue gas, so that the comprehensive heat exchange capacity is further improved.

As shown in fig. 2, the heat exchange module 30 further includes an inlet tube 301 and an outlet tube 302, each row of heat exchange tube assemblies 303 includes end heat exchange tube assemblies 303 respectively located at two ends, outer sleeves 303a of all end heat exchange tube assemblies 303 located at one end of the plurality of rows of heat exchange tube assemblies 303 are all communicated with the inlet tube 301, and outer sleeves 303a of all end heat exchange tube assemblies 303 located at the other end are all communicated with the outlet tube 302. In this way, one inlet pipe 301 supplies cooling water to all the heat exchange tube assemblies 303 of one heat exchange module 30, and the cooling water in the outer jacket 303a of all the heat exchange tube assemblies 303 flows out through one outlet pipe 302. Such a heat exchange module 30 only needs to be provided with an inlet pipe 301 and an outlet pipe 302, so that the cooling water can be conveniently controlled to enter and exit, and meanwhile, the material can be greatly saved, and of course, each row can be controlled by adopting a separate inlet pipe and outlet pipe.

As shown in fig. 6, since the heat exchange tube assemblies 303 are alternately connected up and down in turn, the lower ends of the heat exchange tube assemblies 303 are not connected at intervals, at this time, a thin tube may be provided as the drain tube 306, and two adjacent outer sleeves 303a with the lower ends not connected are connected, and the diameter of the drain tube 306 is far smaller than that of the lower connecting tube 305b at the lower end, so that the serpentine flow direction of the cooling water is not affected during operation. However, when the device stops working and water is needed to be discharged from the water stored in the heat pipes 303a, the lower ends of all the outer sleeves 303a in one row form a waterway positioned at the lower ends through the water discharge pipe 306 and the lower connecting pipe 305b, which is beneficial to thoroughly discharging the water stored in the outer sleeves 303a.

With continued reference to fig. 2, the heat exchange portion includes at least one row of heat exchange modules 30, each row of heat exchange modules 30 includes at least one heat exchange module 30, and the heat exchange modules 30 of one row are distributed along the arrangement direction of the heat exchange tube assemblies 303 of the plurality of rows in the heat exchange modules 30. In fig. 2, the heat exchange portion includes two rows of heat exchange modules 30 distributed from left to right, one row includes five heat exchange modules 30 distributed up and down, multiple rows of heat exchange tube assemblies 303 in each heat exchange module 30 are also distributed up and down, sixteen rows of heat exchange tube assemblies 303 are distributed, each row of heat exchange tube assemblies 303 may include fourteen heat exchange tube assemblies 303, these numbers are only specific examples of which, of course, specific heat exchange portion composition specifications may be determined according to factors such as specific heat exchange requirements, setting space, and the like. In fig. 2, the arrangement direction of the multiple rows of heat exchange modules 30 is consistent with the flow direction of the flue gas, the two rows of heat exchange modules 30 are distributed left and right, and the flue gas and cooling water enter and exit in the left and right directions; the arrangement direction of the heat exchange modules 30 of each row of heat exchange modules 30 is perpendicular to the flue gas flow direction, and the arrangement direction is in the horizontal plane, so that the heat exchange modules can be distributed in the vertical plane.

The cooling water can flow between the inner wall of the outer sleeve 303a and the outer wall of the corresponding heat pipe 303 b; in each row of heat exchange tube assemblies 303, the plurality of outer jackets 303a are sequentially and alternately connected up and down in the first direction through the first connecting tubes.

As shown in fig. 2, the flue gas heat collector in this embodiment may further include an inlet manifold 601 and an outlet manifold 602, where the inlet pipes 301 of the heat exchange modules 30 of the forefront row are all connected to the inlet manifold 601, and the outlet pipes 302 of the heat exchange modules 30 of the final row are all connected to the outlet manifold 602, where the forefront and final refer to the heat exchange module rows at both ends of the heat exchange portion. In addition, in the adjacent rows of heat exchange modules 30, the inlet pipe 301 of one and the outlet pipe 302 of the other are in one-to-one correspondence, and may specifically be directly connected through the second connection pipe 70 shown in fig. 2, and of course, when only one row of heat exchange modules 30 is provided, all the inlet pipes 301 and the outlet pipes 302 at two ends of the row of heat exchange modules 30 may be respectively connected to the inlet manifold 601 and the outlet manifold 602.

By the arrangement, the whole heat exchange part can realize the inflow and outflow of cooling water through the inlet manifold 601 and the outlet manifold 602, and although a plurality of outer sleeves 303a of the end part of one row of heat exchange modules 30 can be simultaneously connected to the inlet manifold 601 and the outlet manifold 602, the arrangement mode of the embodiment is beneficial to the increase and decrease, maintenance and cooling water inlet and outlet control of each heat exchange module 30. For example, when any one of the two heat exchange modules 30 connected in series below in fig. 2 fails, the inlet manifold 601, the outlet manifold 602 and the passages of the two heat exchange modules 30 can be shut down, and the remaining heat exchange modules 30 can still work normally.

As shown in fig. 1, at least one of the inlet smoke box 101, the housing 102, and the outlet smoke box 103 may be provided with a dust removing unit 20 to clean the deposition of particulate matters in the smoke inside the smoke heater. The ash removal mode of the ash removal unit 20 may be sonic ash removal, compressed air ash removal and steam ash removal. When the ash removal unit 20 is provided on the housing 102, not only the ash deposit on the housing 102 but also the ash deposit on the heat pipe 303b can be removed.

Referring again to fig. 4, the upper portion of the heat pipe 303b is almost entirely inserted into the outer sleeve 303a. Fig. 8 is an enlarged schematic view of the region B in fig. 1, as shown in fig. 8, a portion of the heat pipe 303B inserted into the outer sleeve 303a may be defined as a condensation section 303B1, a portion located in the housing 102 for exchanging heat with the high temperature flue gas may be defined as an evaporation section 303B2, and as shown in fig. 4, a plurality of fins 303B3 are further disposed on an outer wall of the evaporation section 303B2 in order to improve the heat exchange efficiency of the evaporation section 303B2.

Alternatively, the partition 304 of the present utility model may be of any form and shape as long as it can function to separate the evaporation section 303b2 and the condensation section 303b1. For example: the separator 304 may be a plate-like separator as shown in fig. 4, or the separator 304 may be a groove-like separator (opening up), or the separator 304 may be a trapezoid-like separator as shown in fig. 8. As shown in fig. 8, the flue gas below the partition 304 can be isolated from the space above the partition 304 by the partition 304, so that the damage of the flue gas to the outer sleeve 303a is avoided, and the service life of the outer sleeve 303a is effectively prolonged. Meanwhile, if the outer sleeve 303a is damaged, the cooling water flows out, and the cooling water does not flow below the partition plate 304, so that the phenomenon that smoke dust particles are quickly condensed into blocks due to contact of the cooling water and smoke gas is avoided.

Alternatively, the trapezoidal separator shown in fig. 8 may be a hollow tube separator or a solid separator. The hollow tubular partition can effectively reduce the weight.

The partition 304 extends in the first direction, the heat pipes 303b of the plurality of heat exchange pipe assemblies 303 of each row of heat exchange pipe assemblies 303 penetrate through one partition 304, and the plurality of partitions 304 are distributed in the second direction. One separator 304 assembles the heat exchange tube assemblies 303 of one row together such that the heat exchange tube assemblies 303 of one row are integrated. Meanwhile, the adjacent partition boards 304 can be connected in a sealing manner, such as airtight welding, as shown in fig. 8, and the side walls of the adjacent partition boards 304 are bonded and welded, so that all the partition boards 304 are connected into a whole, the whole heat exchange module 30 can be divided up and down, flue gas can flow below the partition boards 304, all the outer sleeves 303a of the heat exchange module 30 are positioned above the partition boards 304, and as shown in fig. 8, the part of the heat pipe 303b above the partition boards 304 is basically the condensation section 303b1.

At this time, the flue gas can only pass under the partition 304, but cannot pass over the partition 304, and the cooling water above the flue gas cannot pass under the partition 304, i.e. the flue gas side. Therefore, the gas-water separation of the heat exchange part of the flue gas heat collector is safer, the heat exchange part has an isolation function, and cooling water is easier to ensure not to leak into flue gas during normal operation.

The above separator 304 is a specific example, and it is understood that a single-layer integral separator may be directly provided, and a plurality of heat pipes 303b may penetrate the separator and be connected in a sealing manner. It is apparent that the provision of the plurality of spacers 304, on the one hand, improves the structural strength thereof and also facilitates the connection with the heat exchange tube assemblies 303, by first forming a row of integral heat exchange tube assemblies 303 and then fixing the plurality of rows of heat exchange tube assemblies 303 into one module, i.e., the heat exchange module 30, by welding the spacers 304.

Alternatively, as shown in fig. 4, the outer wall of a portion of the heat pipe 303b not inserted into the outer sleeve 303a in the present utility model is provided with a plurality of fins 303b3.

Of course, in other embodiments, the outer wall of a portion of the heat pipe 303b that is not inserted into the outer sleeve 303a may be a light pipe.

Alternatively, the fins 303b3 may be notched fins, helical fins, or H-fins.

Further, the scalloped fins may be: a U-shaped cogged fin as shown in fig. 10 or a V-shaped cogged fin as shown in fig. 11.

As shown in fig. 12 to 14, the notched fins may be arranged spirally on the heat pipe 303b in the extending direction of the heat pipe 303 b. Of course, the notched fins may be arranged in parallel on the heat pipe 303b along the extending direction of the heat pipe 303 b.

Alternatively, as shown in fig. 12 to 13, the notched fin may be a curved fin. The twist sense of each of the scalloped fins may be the same as shown in fig. 12, although the twist sense of adjacent scalloped fins may be opposite as shown in fig. 13.

Of course, as shown in fig. 14, the notched fin may be a planar fin. As shown in fig. 14, the tooth-forming fins may have a certain inclination angle, and the inclination directions or inclination angles of adjacent tooth-forming fins are different, for example: one inclined upward and one inclined downward, thereby forming the effect of the staggered ends of adjacent cogged fins as shown in fig. 14.

It can be understood that by means of the toothed fins or the curved fins with the inclined angles, the utility model can destroy the dust accumulation rooting points of the adjacent fins by increasing the included angles between the adjacent fins, and can strengthen the heat transfer performance of the fins.

Fig. 9 and 10 are a perspective view and a radial cross-sectional view, respectively, of a heat pipe 303b provided with a U-shaped notched fin. The width of the tooth top of the U-shaped tooth-forming fin is smaller than that of the tooth bottom, the tooth top and the groove bottom are arc-shaped, the stress distribution is uniform, and the fin can be effectively prevented from being torn when the fin is wound. It can be seen from fig. 10 that after the U-shaped tooth-forming fin is wound, the notch formed between adjacent teeth at the top of the fin is large in size, and the ash accumulation area of dust is greatly reduced, so that the dust is not easy to deposit and adhere to the U-shaped tooth-forming fin, and further the ash accumulation bridging phenomenon is not easy to generate, and the problem of easy ash accumulation of the existing tooth-forming fin is effectively solved.

Fig. 11 is a radial cross-sectional view of a heat pipe 303b provided with V-shaped scalloped fins, where the V-shaped scalloped fins are wound such that the tops of the V-shaped scalloped fins are spread to form triangular notches, but the angle of spread of the notches is limited, and the heat pipe is suitable for heat exchange applications with a small amount of dust.

In order to further improve the heat exchange performance and the adaptability of the fins to different heat exchange environments, adjacent sawteeth on the fin belt can be inclined or twisted by a certain angle, the included angle between the adjacent fins is increased, the dust accumulation rooting points are damaged, and meanwhile, the heat transfer performance of the fins can be enhanced. The specific modes are as follows:

mode one: the fins take the form of the arrangement shown in fig. 12. At this time, the fins formed by equally cutting the fin strip are twisted in such a manner that all the adjacent fins are twisted in the same direction in the radial direction of the heat pipe 303b by an angle of 0 ° to 45 °.

Mode two: the fins take the form of the arrangement shown in fig. 13. At this time, the fins formed by equally cutting the fin strip are twisted in such a manner that all the adjacent fins are twisted in the opposite direction to the radial direction of the heat pipe 303b by an angle of 0 ° to 45 °.

Mode three: the fins take the form of the arrangement shown in fig. 14. At this time, the fins formed by equally cutting the fin strip are twisted in such a manner that all the adjacent fins are twisted in opposite directions along the axial direction of the heat pipe 303b, the twisting angle is 0 ° to 45 °, and after twisting, all the adjacent fins form an included angle of 0 ° to 90 °.

Alternatively, each heat exchange tube assembly 303 may be disposed vertically or obliquely.

With continued reference to fig. 5 and 6, and in combination with fig. 15 and 16, fig. 15 is a schematic illustration of the flow of working medium within vertically disposed heat pipes 303 b; fig. 16 is a schematic diagram showing the flow of working fluid in obliquely arranged heat pipes 303 b. The heat pipe 303b shown in fig. 15 is arranged vertically, and the heat pipe 303b shown in fig. 16 is arranged obliquely.

The heat exchange tube assembly 303 is disposed obliquely, i.e., both the heat pipes 303b and the outer jacket 303a are disposed obliquely. As described above, the heat pipe 303b of the heat exchange pipe assembly 303 in this embodiment includes the condensation section 303b1 and the evaporation section 303b2, the condensation section 303b1 is located in the outer sleeve 303a, the flue gas contacts with the evaporation section 303b2 below, the working medium is located in the heat pipe 303b and the heat pipe 303b maintains vacuum, the evaporation section 303b2 transfers heat to the working medium after contacting with the high-temperature flue gas, the working medium absorbs heat and rapidly evaporates and changes phase into steam in vacuum atmosphere, the condensation section 303b1 automatically rises upwards under the action of the upper and lower pressure difference, after flowing to the condensation section 303b1 above, the heat is continuously transferred to the cooling water through the pipe wall to release heat, and the working medium is condensed into liquid state and then returns to the evaporation section 303b2. Each heat pipe 303b is independently arranged, the evaporation section 303b2 of the heat pipe 303b is positioned in the flue gas, the situation that particles in the flue gas are worn exists, when a certain evaporation section 303b2 is worn by the particles in the flue gas, working medium in the heat pipe 303b can leak into the flue gas, but cooling water is isolated outside the pipe by the condensation section 303b1 positioned above the flue gas, so that the cooling water can not continuously leak into the flue gas, the leakage of the cooling water can be reduced or even avoided, and zero leakage is realized. In addition, the cooling water after absorbing heat can be conveyed to the occasion where the cooling water is needed, so that the purposes of reducing the smoke temperature and recovering the smoke waste heat are achieved, and the cooled smoke finally flows out of the outlet smoke box 103 to downstream equipment.

As shown in fig. 15, when the heat pipe 303b and the outer jacket 303a are vertically disposed, the liquid film 303ba formed in the heat pipe 303b is relatively uniformly distributed in the ring Zhou Nabi of the heat pipe 303b when the working fluid in the heat pipe 303b flows back from the condensing section 303b1, resulting in a large thermal resistance. As shown in fig. 16, when the heat pipe 303b and the outer sleeve 303a are both obliquely arranged, the liquid film 303ba is more concentrated on one inclined side, i.e. flows against the inner wall on the lower inclined side, based on the action of gravity in the downward flow process of the working medium after condensation, as shown in fig. 16, i.e. the liquid film 303ba is more concentrated on the inner wall of the condensation section 303b1 near the right side, and occupies smaller inner wall area, so that the thermal resistance is reduced and the heat exchange effect is better.

Of course, the inclination angle is not required to be too large, and the inclination angle can be preferably 0-15 degrees, namely, more than 0 degrees and less than or equal to 15 degrees, and the inclination angle is an included angle with a vertical plane. Therefore, the purpose of reducing the thermal resistance can be achieved, and the rising capability of steam formed after the working medium is evaporated is considered. Of course, the inclination angle is not particularly limited herein, and can be flexibly adjusted according to the site conditions of the actual engineering project. In addition, the heat exchange tube assembly 303 shown in fig. 16 is inclined rightward, and it is understood that the inclination may be in any direction, such as leftward, or inward or outward from the plane of the paper.

As shown in fig. 1, a rotary blowing device 110 is positioned within the housing 102 to disturb the deposited dust.

The flue gas heat collector disclosed by the utility model has the advantages that the flue gas distribution is more uniform through the dust flow uniform distribution unit, so that dust in the flue gas is more uniformly dispersed. Meanwhile, the smoke gas heat collector sprays smoke dust through the rotary spraying device 110, so that the smoke dust is discharged along with the smoke gas, the accumulation of the smoke dust on the smoke gas heat exchanger is effectively reduced, and the heat exchange efficiency of the smoke gas heat exchanger is improved.

Optionally, the rotary blowing device 110 is located at the bottom of the heat exchange module 30 or the bottom of the housing 102, and the blowing direction of the rotary blowing device 110 is toward the top of the housing 102.

As shown in fig. 3, one rotary jetting tool 110 may include a plurality of rotary jetting units 110a, and each rotary jetting unit 110a may have a plurality of jetting ports 110b. Alternatively, the rotary blowing unit 110a may rotate along its center axis to rotate the blowing port 110b, thereby improving the blowing effect. Further, the rotary blowing device 110 may rotate along its central axis to drive each rotary blowing unit 110a to rotate, thereby improving blowing effect.

Optionally, as shown in fig. 1, the flue gas heat collector further includes: heating device 108 for heating the working fluid inside heat pipe 303 b. The heating device 108 can prevent the working medium from freezing, and the heating mode of the heating device 108 can be electric tracing, steam heating, hot air heating and the like.

As shown in fig. 1, the flue gas heat collector in this embodiment is further provided with an intelligent control unit 50, which can collect the operation data of the flue gas heat collector in real time, and compare and analyze the operation data with the set reference data, and when it is determined that the current operation data deviate from the preset reference data greatly after intelligent calculation, an equipment fault early warning is sent, and early warning information can be sent to operation and maintenance personnel in a mobile manner such as a short message or a WeChat to be processed in time. The operation data may include boiler load, flue gas amount, soot blowing frequency of the SCR/air preheater/flue gas heater, inlet and outlet flue gas temperature of the flue gas heater, inlet and outlet water temperature of cooling water, inlet and outlet pressure difference, wall temperature of the end part of the condensation section 303b1 of the heat pipe 303b, and the like. The intelligent control unit 50 can be in butt joint with a whole plant monitoring management system to realize the control of the whole life cycle management of the flue gas heat collector. It can be seen that the intelligent control unit 50 and the corresponding data monitoring unit combine big data, internet+, internet of things with on-line monitoring and fault diagnosis technologies to realize deep energy-saving operation and health management of the device.

With continued reference to fig. 1, the flue gas heat collector is further provided with an online temperature measurement unit 40, which can perform online detection and data analysis on the operating temperature of the heat pipe 303b, specifically, can detect the temperature of the end of the condensation section 303b1 of the heat pipe 303b, and when the temperature is greatly changed, the temperature of the end of the heat pipe 303b changes to a certain degree under a certain degree of vacuum, which indicates that the degree of vacuum changes, so as to monitor whether the heat pipe 303b has a fault. Therefore, the on-line temperature measuring unit 40 can master the working condition of the heat pipe 303b at any time, and guide the operation management and maintenance of the equipment in time, so as to ensure the normal use effect of the equipment.

The foregoing is merely a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model, which are intended to be comprehended within the scope of the present utility model.

Claims (10)

1. A flue gas heat extractor, comprising: an inlet smoke box (101), a shell (102), a heat exchange part, an outlet smoke box (103), an inlet main pipe (601), an outlet main pipe (602) and a rotary blowing device (110),

the inlet smoke box (101) and the outlet smoke box (103) are positioned at two ends of the shell (102);

the heat exchange part comprises a plurality of heat exchange tube assemblies (303), the lower parts of the heat exchange tube assemblies (303) are positioned in the shell (102), the upper parts of the heat exchange tube assemblies (303) are positioned outside the shell (102), and the upper parts of the plurality of heat exchange tube assemblies (303) are communicated;

a first portion of the heat exchange tube assemblies (303) of the plurality of heat exchange tube assemblies (303) is in communication with the inlet manifold (601), and a second portion of the heat exchange tube assemblies (303) of the plurality of heat exchange tube assemblies (303) is in communication with the outlet manifold (602);

the rotary blowing device (110) is located within the housing (102) to disturb the deposited dust.

2. The flue gas extractor of claim 1 wherein the flue gas extractor further comprises: a dust flow uniform distribution unit (80),

the dust flow uniform distribution unit (80) is positioned in a flue inside the inlet smoke box (101) and/or in front of the inlet smoke box (101), and the dust flow uniform distribution unit (80) comprises a plurality of streamline current conductors.

3. A flue gas heat extractor according to claim 1, wherein the heat exchange section comprises a plurality of baffles (304) and at least one heat exchange module (30), the heat exchange module (30) comprising a plurality of rows of heat exchange tube assemblies (303), a row of the heat exchange tube assemblies (303) comprising a plurality of heat exchange tube assemblies (303) arranged in sequence along a first direction; one heat exchange tube assembly (303) comprises a heat tube (303 b) and an outer sleeve (303 a), a part of each heat tube (303 b) is inserted into the corresponding outer sleeve (303 a), the upper end of the outer sleeve (303 a) is in closed connection with the heat tube (303 b), and the lower end of the outer sleeve (303 a) is in closed connection with the partition plate (304);

the partition plates (304) extend along the first direction, and the heat pipes (303 b) of the plurality of heat exchange pipe assemblies (303) of each row of the heat exchange pipe assemblies (303) penetrate through one partition plate (304);

the inlet pipes (301) of the foremost heat exchange module (30) are all communicated with the inlet header pipe (601), the outlet pipes (302) of the last heat exchange module (30) are all communicated with the outlet header pipe (602), and cooling water can flow between the inner wall of the outer sleeve (303 a) and the outer wall of the corresponding heat pipe (303 b); in each row of heat exchange tube assemblies (303), a plurality of outer sleeves (303 a) are sequentially and alternately communicated up and down along the first direction through first connecting tubes.

4. A flue gas heat extractor according to claim 3, characterized in that the rotary blowing device (110) is located at the bottom of the heat exchange module (30) or at the bottom of the housing (102), and that the blowing direction of the rotary blowing device (110) is towards the top of the housing (102).

5. The flue gas extractor according to claim 2, characterized in that the plurality of streamlined flow conductors are arranged on the inner wall of the inlet smoke box (101) and/or in the flue before the inlet smoke box (101).

6. A flue gas heat extractor according to claim 3, wherein the first connecting pipe comprises an upper connecting pipe (305 a) and a lower connecting pipe (305 b), the upper connecting pipe (305 a) is communicated with the upper end of the adjacent outer sleeve (303 a), the lower connecting pipe (305 b) is communicated with the lower end of the adjacent outer sleeve (303 a), and the lower connecting pipe (305 b) is connected with the partition plate (304) to form a closed pipeline.

7. The flue gas extractor of claim 3 wherein the flue gas extractor further comprises: and the heating device (108) can heat the working medium in the heat pipe (303 b).

8. A flue gas extractor according to claim 3, characterized in that the outer wall of a portion of the heat pipe (303 b) not inserted into the outer sleeve (303 a) is provided with a plurality of fins (303 b 3).

9. The flue gas heat extractor according to claim 8, characterized in that the fins (303 b 3) are cogged fins or spiral fins.

10. The flue gas extractor according to claim 9, characterized in that the notched fins are arranged on the heat pipe (303 b) in a spiral or parallel manner along the direction of extension of the heat pipe (303 b).

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