CN115711547A

CN115711547A - Efficient heat exchanger

Info

Publication number: CN115711547A
Application number: CN202211376299.1A
Authority: CN
Inventors: 张志华
Original assignee: Tbg Marintec Co ltd
Current assignee: Tbg Marintec Co ltd
Priority date: 2022-11-04
Filing date: 2022-11-04
Publication date: 2023-02-24

Abstract

The invention provides a high-efficiency heat exchanger, which belongs to the technical field of methanol heat exchange and comprises a shell, a heat exchange tube assembly, an end cover, a spacer ring, a first inlet tube assembly, a first outlet tube assembly, a second inlet tube assembly and a second outlet tube assembly; the heat exchange tube assembly comprises a heat exchange tube, a baffle plate, a tube plate and a distance tube assembly; the baffle plate is arranged on the heat exchange tube, the distance tube assembly is arranged on the baffle plate, one end of the heat exchange tube is connected with the tube plate, the end surface of the tube plate is vertical to the tube bundle of the heat exchange tube, the shell is sleeved outside the heat exchange tube, the spacer ring is positioned between the end cover and the tube plate, the first inlet tube assembly and the first outlet tube assembly are positioned on the end cover, the second inlet tube assembly and the second outlet tube assembly are positioned on the shell, gaps are formed in the baffle plate, the baffle plate is uniformly connected to the heat exchange tube at intervals, and the gaps of the baffle plate at two ends are opposite to the installation position of the second inlet tube assembly; the heated medium is partitioned by the baffle plate to do plug-flow S-shaped movement in the plurality of cavities, so that heat exchange between the heat source and the heated medium is realized.

Description

Efficient heat exchanger

Technical Field

The invention relates to the technical field of methanol heat exchange, in particular to a high-efficiency heat exchanger.

Background

With the increasing global concern over carbon emissions, attention is being turned to the production of a widely available alternative fuel, methanol, the use of green methanol as a fuel is becoming more and more apparent in industry and on ships. The carbon neutral and closed carbon circulation of the green methanol can be realized in the process from production to consumption, the dependence on imported fossil energy can be reduced by using locally produced methanol, so that the energy safety of the country is improved, and the emission of carbon dioxide can be reduced by 95 percent by using green methanol fuel. In addition, in combination with advanced fuel cell technology, the emission of nitrogen oxides, sulfur oxides and particulate matters can be completely eliminated even by taking green methanol as fuel, the reduction of carbon dioxide emission is important for coping with climate change, and the elimination of particulate matters can reduce air pollution, thereby improving public health. The heat exchanger using the green methanol fuel in the marine system has the advantages that the heat exchange efficiency, including the exchange aging and the energy efficiency are reflected in the excellent quality of the heat exchanger. Meanwhile, the green methanol serving as a power source can be well utilized after being heated, so that the green methanol can be converted and utilized through effective heat exchange.

At present, in domestic similar products, seamless steel pipes adopted by heat exchange pipe assemblies are large in pipe diameter and large in space, so that the heat exchange area in the same shell is reduced, the heat exchange efficiency loss is serious, and in addition, the inlet and outlet isolation design of a heat source is complex.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the efficient heat exchanger which can improve the heat exchange efficiency between the heat source and the heated medium.

The invention solves the technical problems through the following technical scheme:

a high efficiency heat exchanger comprising: the device comprises a shell, a heat exchange tube assembly, an end cover, a spacer ring, a first inlet tube assembly, a first outlet tube assembly, a second inlet tube assembly, a second outlet tube assembly and a screw rod assembly; the heat exchange tube assembly includes: the heat exchange tube, the baffle plate, the tube plate and the distance tube component are arranged on the heat exchange tube; the heat exchange tube comprises a shell, a plurality of heat exchange tubes, a plurality of baffle plates, a plurality of distance tube assemblies, a plurality of spacer tubes and a plurality of spacer rings, wherein the baffle plates are arranged on the heat exchange tubes, the distance tube assemblies are arranged on the baffle plates, one ends of the heat exchange tubes are connected with the tube plates, the end surfaces of the tube plates are vertical to tube bundles of the heat exchange tubes, one end of the shell is open, the other end of the shell is closed, the shell is sleeved outside the heat exchange tubes, the spacer rings are positioned between the end covers and the tube plates, the inlet tube assembly I and the outlet tube assembly I are both positioned on the end covers, the inlet tube assembly II and the outlet tube assembly II are both positioned on the shell, and the end covers, the tube plates and the shell are fixedly connected through the plurality of bolt assemblies; the heat exchange tube is characterized in that the baffle plates are provided with notches, the baffle plates are uniformly connected to the heat exchange tube at intervals, the notches of two adjacent baffle plates face opposite directions, and the notches of the baffle plates positioned at the two end parts of the heat exchange tube are back to the installation position of the inlet tube assembly II.

Has the advantages that: the plurality of heat exchange tubes are densely distributed and connected on the tube plate, a larger heat exchange area and better energy efficiency can be obtained in the shell with the same volume, the plurality of baffle plates are uniformly connected on the heat exchange tubes at intervals, a heated medium flowing through the shell is staggered and separated in the plurality of cavities by the baffle plates on the heat exchange tube assembly one above the other, a plug-flow S-shaped motion is carried out in the cavities, and meanwhile progressive heat exchange is carried out with a heat source in the heat exchange tube assembly in the flowing process, so that the heat exchange between the heat source and the heated medium is efficiently realized, the attenuation of the heat exchange effect in the long-time use process is reduced, and the cleaning is more convenient.

Furthermore, the spacer ring is of a circular ring structure, and a partition is arranged in the middle of the spacer ring.

Has the beneficial effects that: the spacer ring is of a circular ring structure, and a partition is arranged in the middle of the spacer ring, so that two chambers can be formed, the heat source inlet A and the heat source outlet B can be effectively isolated, and the isolated sealing effect can be visually checked.

Furthermore, a plurality of layers of hole sites are distributed on the tube plate by taking the transverse diameter direction as the axial symmetry direction, the distance between the circle centers of every two hole sites on each side is the same, the heat exchange tube is a U-shaped tube, and the two open ends of the U-shaped tube are respectively connected to the hole sites on the same layer on the tube plate by taking the transverse diameter of the tube plate as the symmetry axis.

Furthermore, the distance tube assembly comprises a lock rod, a plurality of distance tubes and a first nut, the distance tubes are sleeved on the lock rod, and one end of the lock rod is installed on the baffle plate through the first nut.

Furthermore, a plurality of layers of hole sites are distributed on two sides of the tube plate in an axisymmetric manner along a transverse diameter direction, eight hole sites including S1, S2, S3, S4, S5, S6, S7 and S8 are distributed on one side of the tube plate, sixteen hole sites are distributed on the S1 layer, fifteen hole sites are distributed on the S2 layer, fourteen hole sites are distributed on the S3 layer, thirteen hole sites are distributed on the S4 layer, twelve hole sites are distributed on the S5 layer, eleven hole sites are distributed on the S6 layer, eight hole sites are distributed on the S7 layer, and four hole sites are distributed on the S8 layer.

Has the beneficial effects that: the heat exchange tubes are connected to hole sites of S1, S2, S3, S4, S5, S6, S7 and S8 on the tube plate, two ends of an opening of each U-shaped tube are respectively inserted to the hole sites on the same layer on the tube plate by taking the transverse diameter of the tube plate as a symmetry axis, the openings of the U-shaped tubes on different layers are different in size, the opening of the U-shaped tube connected on the S1 layer is the smallest, and the opening of the U-shaped tube connected on the S8 layer is the largest.

Further, an angle between a horizontal line S where the notch on the baffle plate is located and a shearing line S11 at two ends of the baffle plate after shearing is 30 degrees.

Further, hole sites on the baffle plate before notch machining are respectively the same as the tube plate, a plurality of layers of hole sites are distributed on the baffle plate on two sides of the baffle plate in an axisymmetric manner along a transverse diameter direction, eight layers of hole sites including S1, S2, S3, S4, S5, S6, S7 and S8 are distributed on one side of the baffle plate, sixteen hole sites are distributed on the S1 layer, fifteen hole sites are distributed on the S2 layer, fourteen hole sites are distributed on the S3 layer, thirteen hole sites are distributed on the S4 layer, twelve hole sites are distributed on the S5 layer, eleven hole sites are distributed on the S6 layer, eight hole sites are distributed on the S7 layer, and four hole sites are distributed on the S8 layer.

Has the beneficial effects that: the invention provides a design idea of a baffle plate, which is characterized in that hole positions for installing heat exchange tubes on the baffle plate are processed to be the same as the hole position distribution on a tube plate, then the positions of gaps of the baffle plate are cut, and the angle between the horizontal line of the positions of the gaps and the cutting line S11 at the two ends of the cut baffle plate is 30 degrees.

Furthermore, the side surfaces of the two ends of the shell are respectively provided with an observation hole and a nitrogen inlet, and the observation hole and the nitrogen inlet are formed by welding a seamless steel pipe and a flange.

Has the beneficial effects that: when being heated medium just got into the casing, can look over whether the intracavity is full of by heated medium through the observation hole on the casing, when the system need be maintained or be in the shutdown state at any part wherein, green methyl alcohol in the heat exchanger can insert nitrogen gas through nitrogen gas entry and wash totally, does not have green methyl alcohol in the assurance heat exchanger, guarantees environmental safety.

Furthermore, the opening end of the shell is connected with a first flange, a plurality of screw holes are uniformly distributed on the circumferences of the end cover, the tube plate and the first flange, the bolt assembly comprises a screw rod and a second nut, and the end cover, the tube plate and the first flange are fixedly connected with the second nut through a plurality of screw rods.

The spacer ring gasket is of a circular ring structure, a partition is arranged in the middle of the spacer ring gasket, at least two spacer ring gaskets are respectively positioned between the spacer ring and the tube plate and between the spacer ring and the end cover, and the gaskets are positioned between the first flange and the tube plate.

Compared with the prior art, the invention provides an efficient heat exchanger, which has the following beneficial effects:

1. the plurality of heat exchange tubes are densely distributed and connected on the tube plate, a larger heat exchange area and better energy efficiency can be obtained in the shell with the same volume, the plurality of baffle plates are uniformly connected on the heat exchange tubes at intervals, a heated medium flowing through the shell is staggered and separated in the plurality of cavities by the baffle plates on the heat exchange tube assembly from top to bottom and performs plug-flow S-shaped motion in the cavities, and the heated medium and a heat source in the heat exchange tubes in the heat exchange tube assembly perform progressive heat exchange in the flowing process, so that the heat exchange between the heat source and the heated medium is efficiently realized, the attenuation of the heat exchange effect in the long-time use process is reduced, and the cleaning is more convenient.

2. The spacer ring is of a circular ring structure, and a partition is arranged in the middle of the spacer ring, so that two chambers can be formed, the heat source inlet A and the heat source outlet B can be effectively isolated, and the isolated sealing effect can be visually checked.

3. The heat exchange tubes are connected to hole sites of S1, S2, S3, S4, S5, S6, S7 and S8 on the tube plate, two ends of an opening of each U-shaped tube are respectively inserted into hole sites of the same layer on the tube plate by taking the transverse diameter of the tube plate as a symmetry axis, the openings of the U-shaped tubes on different layers are different in size, the opening of the U-shaped tube connected on the layer S1 is the smallest, and the opening of the U-shaped tube connected on the layer S8 is the largest.

4. The invention provides a design idea of a baffle plate, which is characterized in that hole positions for installing heat exchange tubes on the baffle plate are processed to be the same as the hole position distribution on a tube plate, then the positions of gaps of the baffle plate are cut, and the angle between the horizontal line of the positions of the gaps and the cutting line S11 at the two ends of the cut baffle plate is 30 degrees.

5. When being heated medium just got into the casing, can look over whether the intracavity is full of heated medium through the observation hole on the casing, when the system need be maintained or be in the shutdown state at any part wherein, green methyl alcohol in the heat exchanger can insert nitrogen gas through the nitrogen gas entry and wash totally, does not have green methyl alcohol in the assurance heat exchanger, guarantees environmental safety.

Drawings

FIG. 1 is a perspective view of a high efficiency heat exchanger of the present invention;

FIG. 2 is a front view of the high efficiency heat exchanger of the present invention;

FIG. 3 is a side view of a high efficiency heat exchanger of the present invention;

FIG. 4 is a perspective view of a heat exchange tube assembly of the high efficiency heat exchanger of the present invention;

FIG. 5 is a front view of the heat exchange tube assembly of the high efficiency heat exchanger of the present invention;

FIG. 6 is a side view of a heat exchange tube assembly of a high efficiency heat exchanger of the present invention;

FIG. 7 is a front view of a baffle of a high efficiency heat exchanger of the present invention;

FIG. 8 is a front view of a spacer assembly of a high efficiency heat exchanger of the present invention;

FIG. 9 is a front view of the housing of the high efficiency heat exchanger of the present invention;

FIG. 10 is a side view of the housing of the high efficiency heat exchanger of the present invention;

FIG. 11 is a front view of a spacer ring of the high efficiency heat exchanger of the present invention;

FIG. 12 is a front view of a spacer washer of the high efficiency heat exchanger of the present invention;

in the figure: 11 shell, 12 flange I, 21 heat exchange tube, 22 baffle plate, 23 tube plate, 24 distance tube component, 241 lock rod, 242 distance tube, 243 nut I, 30 end cover, 40 spacer ring, 41 spacer ring gasket, 51 inlet tube component I, 52 outlet tube component I, 61 inlet tube component II, 62 outlet tube component II, 71 observation hole, 72 nitrogen inlet, 80 bracket, 91 screw and 92 nut II; a is a heat source inlet, B is a heat source outlet, C is a heated medium inlet, and D is a heated medium outlet.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The technical scheme of the invention is further described by combining the drawings and the specific embodiments in the specification:

1-2, a high efficiency heat exchanger, comprising: the shell 11, the heat exchange tube assembly, the end cover 30, the spacer ring 40, the first inlet tube assembly 51, the first outlet tube assembly 52, the second inlet tube assembly 61, the second outlet tube assembly 62 and the screw assembly; referring to fig. 4-5, the heat exchange tube assembly comprises: the heat exchange tube 21, the baffle 22, the tube plate 23, the distance tube assembly 24, the first inlet tube assembly 51, the first outlet tube assembly 52, the second inlet tube assembly 61 and the second outlet tube assembly 62 are all formed by welding seamless steel tubes and flanges, and the screw assembly comprises a screw 91 and a nut 92.

With continuing reference to fig. 1-5, a plurality of baffle plates 22 are mounted on a plurality of heat exchange tubes 21, a plurality of distance tube assemblies 24 are mounted on the baffle plates 22, one end of each heat exchange tube 21 is connected with a tube plate 23, the end surface of the tube plate 23 is perpendicular to the tube bundle of the heat exchange tube 21, the shell 11 is sleeved outside the heat exchange tube 21, a spacer ring 40 is positioned between an end cover 30 and the tube plate 23, the spacer ring 40 effectively isolates a heat source inlet a and a heat source outlet B, referring to fig. 11-12, the spacer ring 40 is of a circular ring structure, a partition is arranged in the middle, so that two chambers can be formed, the heat source inlet a and the heat source outlet B can be effectively isolated, the isolated sealing effect can be visually checked, a spacer ring gasket 41 is respectively arranged between the spacer ring 40 and the tube plate 23, between the spacer ring 40 and the end cover 30, the spacer ring gasket 41 is also of a circular ring structure, and a partition is arranged in the middle. The first inlet pipe assembly 51 and the first outlet pipe assembly 52 are welded on the end cover 30 at a certain distance, a plurality of screw holes are uniformly distributed on the circumferences of the end cover 30, the tube plate 23 and the first flange 12, the end cover 30, the tube plate 23 and the first flange 12 on the shell 11 are fixedly connected through a plurality of screws 91 and second nuts 92, and a gasket is arranged between the first flange 12 and the tube plate 23.

As shown in fig. 9 to 10, one end of the shell 11 is open, the other end is closed by an elliptical head, the first flange 12 is welded to the open end of the shell 11, the second inlet pipe assembly 61 and the second outlet pipe assembly 62 are welded to the side of the shell 11 at a certain distance, and a horizontal line connecting the second inlet pipe assembly 61 and the second outlet pipe assembly 62 is parallel to the central axis of the shell 11.

As shown in fig. 4-6, the heat exchange tube 21 is a U-shaped tube, and is made of seamless steel tubes with an outer diameter of 10mm and a space of 12.5mm, so that the heat exchange area can be greatly increased, and the heat exchange efficiency can be improved. The plurality of heat exchange tubes 21 are connected to hole sites of S1, S2, S3, S4, S5, S6, S7 and S8 on the tube plate 23, two ends of an opening of each U-shaped tube are respectively inserted into the hole sites on the same layer on the tube plate 23 by taking the transverse diameter of the tube plate 23 as a symmetry axis, the openings of the U-shaped tubes on different layers are different in size, the opening of the U-shaped tube connected on the S1 layer is the smallest, and the opening of the U-shaped tube connected on the S8 layer is the largest. The heat exchange tube 21 and the tube plate 23 are connected by a tube expansion process, and in the tube expansion process, the end surface of the tube plate 23 is ensured to be vertical to the tube bundle of the heat exchange tube 21. The heat exchange tubes 21 of the present invention are more dense than the heat exchange tube assemblies of tubes of diameter 14 x 1 or diameter 16 x 1 typically employed in the same volume of the shell 11, enabling a greater heat exchange area and better energy efficiency to be achieved in the same volume of the shell.

Referring to fig. 6, a plurality of layers of hole sites are distributed on two sides of the tube plate 23 symmetrically with respect to the transverse diameter direction, and the distribution of the hole sites on one side is described, and the distribution of the hole sites on the other side is the same. Eight hole sites of S1, S2, S3, S4, S5, S6, S7 and S8 are distributed on one side of the tube plate 23, wherein sixteen hole sites are distributed on the S1 layer, fifteen hole sites are distributed on the S2 layer, fourteen hole sites are distributed on the S3 layer, thirteen hole sites are distributed on the S4 layer, twelve hole sites are distributed on the S5 layer, eleven hole sites are distributed on the S6 layer, eight hole sites are distributed on the S7 layer, four hole sites are distributed on the S8 layer, the distance between the circle centers of every two hole sites is the same, the hole sites on the S1, S2, S3, S4, S5, S6, S7 and S8 layers are all used for installing the heat exchange tubes 21, and a round hole is distributed on each of the tube plate 23 in the transverse and vertical diameter directions and used for installing and positioning the distance tube assembly 24. The tube plate 23 is also provided with a plurality of screw holes on the circumference, and the screw holes are matched with the screw holes on the end cover 30 and the flange I12 and used for positioning and installing the shell 11, the tube plate 23 and the end cover 30.

The diameter of the baffle plate 22 is smaller than the inner diameter of the shell 11, specifically, the unilateral clearance between the outer edge of the baffle plate 22 and the inner diameter of the shell 11 is 1mm, and before processing, the inner diameter of the shell 11 needs to be carefully checked. As shown in fig. 7, the hole locations on the baffle 22 before the notch is machined are distributed the same as those on the tube sheet 23, specifically, a plurality of hole locations are distributed on both sides of the baffle 22, which are axisymmetrical with respect to the transverse diameter direction, so as to introduce the hole location distribution on one side, and the hole location distribution on the other side is completely the same. Eight hole sites of S1, S2, S3, S4, S5, S6, S7 and S8 are distributed on one side of the baffle plate 22, wherein sixteen hole sites are distributed on the S1 layer, fifteen hole sites are distributed on the S2 layer, fourteen hole sites are distributed on the S3 layer, thirteen hole sites are distributed on the S4 layer, twelve hole sites are distributed on the S5 layer, eleven hole sites are distributed on the S6 layer, eight hole sites are distributed on the S7 layer, four hole sites are distributed on the S8 layer, the distance between the circle centers of every two hole sites is the same, the reference is continuously made to the figure 7, a gap is formed in the S layer on the baffle plate 22, and the angle between the horizontal line of the S layer and the shearing line S11 at the two ends of the sheared baffle plate 22 is 30 degrees. Referring to fig. 4-5, a plurality of baffles 22 are uniformly inserted into the heat exchange tube 21 at intervals, the notches of two adjacent baffles 22 face opposite directions, and the notches of the baffles 22 at the two ends of the heat exchange tube 21 are both opposite to the installation position of the second inlet tube assembly 61 or the second outlet tube assembly 62. The heated medium flowing through the shell 11 is partitioned in a plurality of cavities in a staggered way one above the other by the baffle plates 22 on the heat exchange tube assembly, and performs plug flow type S-shaped movement in the cavities, and simultaneously performs progressive heat exchange with a heat source in the heat exchange tube 21 in the heat exchange tube assembly in the flowing process, so that the heat exchange between the heat source and the heated medium is efficiently realized, the attenuation of the heat exchange effect in the long-time use process is reduced, and the cleaning is more convenient.

As shown in fig. 8, a plurality of spacer assemblies 24 are located in the tube side of the heat exchange tube assembly and between the plurality of heat exchange tubes 21, the spacer assemblies 24 comprising: the baffle plate comprises a locking rod 241, distance pipes 242 and nuts 243, wherein the distance pipes 242 are sleeved on the locking rod 241, and one end of the locking rod 241 is installed on the baffle plate 22 through the nuts 243.

With reference to fig. 1-3, the upper side surfaces of the two ends of the housing 11 are provided with an observation hole 71 and a nitrogen inlet 72, the observation hole 71 and the nitrogen inlet 72 are both formed by welding a seamless steel tube and a flange, and when a heated medium just enters the housing 11, whether the cavity is filled with the heated medium can be checked through the observation hole 71 on the housing 11. When any part of the system needs to be maintained or is in a shutdown state, the green methanol in the heat exchanger can be flushed by introducing nitrogen through the nitrogen inlet 72, so that the environment safety is ensured and no green methanol is generated in the heat exchanger. Two brackets 80 are welded to the side of the housing 11 at a distance from each other, and the horizontal line connecting the two brackets 80 is parallel to the central axis of the housing 11.

The working principle is as follows: referring to fig. 2, the heat source may be water or an ethylene glycol aqueous solution, the heat source flows into the tube side of the heat exchange tube 21 from the heat source inlet a, the heated medium flows into the shell side of the housing 11 from the medium inlet C, the heated medium flowing through the shell side is partitioned by the baffle plate 22 on the heat exchange tube assembly to form a plurality of chambers, the heated medium performs plug-flow S-shaped movement therein, and performs progressive heat exchange with the heat source in the heat exchange tube assembly during the flowing process, thereby efficiently achieving heat exchange between the heat source and the heated medium. The heat source is kept apart through spacer ring 40 in heat source import A and heat source export B department, the heat source after accomplishing the heat exchange flows out by heat source export B, by heating medium by medium export D outflow, whether can look over in the casing 11 through observation hole 71 and be full of by heating medium, before system maintenance operation, when the host computer standby, in order to avoid methanol to reveal and cause poisoning and pollution accident, must clean discharge work to the heat exchanger, open nitrogen gas entry 72 this moment, with the methanol in the nitrogen gas flushing discharge heat exchanger, before the host computer starts, methanol gets into the pipeline, and discharge nitrogen gas through the degasification valve, can watch whether the methanol state in the heat exchanger is normal through observation hole 71, guarantee that the methanol of appropriate temperature supplies the host computer to use.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A high efficiency heat exchanger, comprising: the heat exchange tube heat exchanger comprises a shell (11), a heat exchange tube assembly, an end cover (30), a spacer ring (40), a first inlet tube assembly (51), a first outlet tube assembly (52), a second inlet tube assembly (61), a second outlet tube assembly (62) and a screw rod assembly; the heat exchange tube assembly includes: the heat exchange tube (21), the baffle plate (22), the tube plate (23) and the distance tube component (24); the heat exchanger comprises a plurality of heat exchange tubes (21), a plurality of baffle plates (22), a plurality of distance tube assemblies (24), a plurality of heat exchange tubes (21), a tube plate (23), an end face of the tube plate (23), a tube bundle of the heat exchange tubes (21), an opening at one end of the shell (11), a closed end of the shell, a heat exchange tube (21), a spacer ring (40), an inlet tube assembly I (51) and an outlet tube assembly I (52), an inlet tube assembly II (61) and an outlet tube assembly II (62), wherein the inlet tube assembly II (61) and the outlet tube assembly II (62) are arranged on the shell (11), and the end cover (30), the tube plate (23) and the shell (11) are fixedly connected through a plurality of bolt assemblies; the baffle plates (22) are provided with notches, the baffle plates (22) are uniformly connected to the heat exchange tube (21) at intervals, the notches of the two adjacent baffle plates (22) face opposite directions, and the notches of the baffle plates (22) positioned at the two end parts of the heat exchange tube (21) are back to the installation position of the inlet tube assembly II (61).

2. The high efficiency heat exchanger of claim 1 wherein the spacer ring (40) is of annular configuration with a partition therebetween.

3. The efficient heat exchanger according to claim 2, wherein a plurality of layers of hole sites are distributed on the tube plate (23) at two sides of the tube plate symmetrically taking the transverse diameter direction as an axis, the distance between the centers of every two hole sites on each side is the same, the heat exchange tube (21) is a U-shaped tube, and two open ends of the U-shaped tube are respectively connected to the hole sites on the same layer on the tube plate (23) by taking the transverse diameter of the tube plate (23) as a symmetric axis.

4. The high efficiency heat exchanger of claim 3, wherein the distance tube assembly (24) comprises a locking rod (241), distance tubes (242) and a first nut (243), a plurality of the distance tubes (242) are sleeved on the locking rod (241), and one end of the locking rod (241) is mounted on the baffle plate (22) through the first nut (243).

5. The efficient heat exchanger of claim 4, wherein the tube sheet (23) has a plurality of holes distributed thereon in a plurality of layers symmetrically on both sides with respect to a transverse diameter direction, and eight holes S1, S2, S3, S4, S5, S6, S7, and S8 are distributed on one side of the tube sheet (23), wherein the S1 layer has sixteen holes, the S2 layer has fifteen holes, the S3 layer has fourteen holes, the S4 layer has thirteen holes, the S5 layer has twelve holes, the S6 layer has eleven holes, the S7 layer has eight holes, and the S8 layer has four holes.

6. The high efficiency heat exchanger of claim 5, wherein the angle between the horizontal line S of the notches of the baffle plate (22) and the cut line S11 of the two ends of the baffle plate (22) after cutting is 30 degrees.

7. The efficient heat exchanger of claim 6, wherein the hole sites on the baffle plate (22) before the notch is machined are respectively the same as those on the tube plate (23), a plurality of layers of hole sites are distributed on the baffle plate (22) in a manner of axial symmetry in the transverse diameter direction, and eight layers of hole sites are distributed on two sides of the baffle plate (22), wherein eight layers of hole sites including S1, S2, S3, S4, S5, S6, S7 and S8 are distributed on one side of the baffle plate (22), wherein sixteen hole sites are arranged on the S1 layer, fifteen hole sites are arranged on the S2 layer, fourteen hole sites are arranged on the S3 layer, thirteen hole sites are arranged on the S4 layer, twelve hole sites are arranged on the S5 layer, eleven hole sites are arranged on the S6 layer, eight hole sites are arranged on the S7 layer, and four hole sites are arranged on the S8 layer.

8. The high-efficiency heat exchanger of claim 1, wherein the shell (11) is provided with an observation hole (71) and a nitrogen inlet (72) on the upper side surfaces of two ends, and the observation hole (71) and the nitrogen inlet (72) are both welded by a seamless steel pipe and a flange.

9. The efficient heat exchanger of claim 1, wherein a first flange (12) is connected to the open end of the shell (11), a plurality of screw holes are uniformly distributed on the circumferences of the end cover (30), the tube plate (23) and the first flange (12), the bolt assembly comprises a screw rod (91) and a second nut (92), and the end cover (30), the tube plate (23) and the first flange (12) are fixedly connected through the plurality of screw rods (91) and the second nut (92).

10. The high efficiency heat exchanger of claim 9 further comprising spacer ring spacers (41) and spacers, wherein the spacer ring spacers (41) are of a circular ring structure with a partition therebetween, at least two spacer ring spacers (41) are respectively located between the spacer ring (40) and the tube plate (23) and between the spacer ring (40) and the end cover (30), and the spacers are located between the first flange (12) and the tube plate (23).