Multi-group composite winding pipe type heat exchanger

Abstract

The utility model discloses a multi-group composite winding pipe type heat exchanger which comprises a shell, a medium inlet and a medium outlet, and an inlet end partition plate and an outlet end partition plate are fixedly connected in the shell. An inner split-range cylinder and an outer split-range cylinder are arranged in a shell, the opposite ends of the inner split-range cylinder and the outer split-range cylinder are fixedly connected with an inlet end partition plate and an outlet end partition plate respectively, and a plurality of inlet via holes connected with an inner hole of the inner split-range cylinder are formed in the inlet end partition plate; a plurality of outlet via holes connected with an inner cavity of the shell on the radial outer side of the outer split-range cylinder are formed in the outlet end partition plate; two ends of the preheating winding tube bundle, the hair winding tube bundle and the overheating winding tube bundle in the shell are respectively connected with an inlet and an outlet which are respectively formed in the side wall of the shell; the utility model can realize three functions of preheating, evaporation and overheating, has the advantages of compact structure, large heat exchange area per unit volume, high heat transfer efficiency and capability of realizing multi-stream heat exchange, can improve the steam quality, avoids blockage, and is easy to realize large scale.

Description

Technical Field

[0001] The utility model relates to a tubular heat exchanger, in particular to a radial multi-group composite winding tubular heat exchanger for molten salt heat storage. Background Art

[0002] Molten salt heat storage is currently mainly used in large-scale heat storage systems for solar thermal power generation. It has good economic efficiency, and the evaporation system is an important component. The evaporation system consists of heat exchangers such as preheaters, evaporators, and superheaters. High-temperature molten salt is used to preheat, evaporate, and superheat high-pressure feed water before sending it to the steam turbine for power generation. The heat exchangers of the existing evaporation system mostly use three independent heat exchangers connected by pipes. The structural type of the heat exchanger generally adopts hairpin, U-tube, and serpentine heat exchangers. This type of heat exchanger is not only large in size and floor space, but also has a small heat exchange area per unit volume, resulting in low heat exchange efficiency, which limits the further large-scale solar thermal power generation units and is not conducive to the existing thermal power units combined with molten salt heat storage systems to achieve deep peak regulation. Summary of the invention

[0003] The purpose of the utility model is to provide a radial multi-group composite wound tube heat exchanger in view of the above-mentioned deficiencies in the prior art, which can realize the three functions of preheating, evaporation and superheating, has a compact structure, has the advantages of large heat exchange area per unit volume, high heat transfer efficiency, and can realize multi-stream heat exchange, and can improve steam quality, avoid blockage, and is easy to realize large-scale.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a multi-group composite wound tube heat exchanger, comprising a shell, a medium inlet and a medium outlet connected to the two ends of the shell, and an inlet end partition and an outlet end partition are fixedly connected in the shell; the characteristic is that an inner dividing cylinder and an outer dividing cylinder are arranged in the shell between the inlet end partition and the outlet end partition, one end of the inner dividing cylinder is fixedly connected to the inlet end partition, and one end thereof is arranged with a gap with the outlet end partition, and a plurality of inlet through holes connected to the inner hole of the inner dividing cylinder are arranged in the inlet end partition; the outer dividing cylinder is located radially outside the inner dividing cylinder, one end of the outer dividing cylinder is arranged with a gap with the inlet end partition, and one end thereof is fixedly connected to the outlet end partition, and the outlet end A plurality of outlet holes connected to the inner cavity of the shell radially outside the outer split-range cylinder are arranged in the partition; a preheating inlet, a preheating outlet, an evaporation inlet, an evaporation outlet, a superheating inlet and a superheating outlet are arranged on the shell side wall between the inlet end partition and the outlet end partition; a preheating winding tube bundle is arranged in the shell radially outside the outer split-range cylinder, and the two ends of the preheating winding tube bundle are respectively connected to the preheating inlet and the preheating outlet; an evaporation winding tube bundle is arranged between the outer split-range cylinder and the inner split-range cylinder, and the two ends of the evaporation winding tube bundle are respectively connected to the preevaporation inlet and the evaporation outlet; a superheating winding tube bundle is arranged in the inner split-range cylinder, and the two ends of the superheating winding tube bundle are respectively connected to the superheating inlet and the superheating outlet;

[0005] When the utility model is used, the molten salt flows on the shell side, and the steam and water flow on the tube side. The heat exchange zone in the shell is divided into a preheating section, an evaporation section, and a superheating section through the inlet end partition and the outlet end partition, the outer dividing cylinder and the inner dividing cylinder. The molten salt flows in a folded manner in the heat exchange zone, and exchanges heat with the steam and water in each wound tube bundle separately, and the obtained superheated steam is sent to the steam turbine for power generation. The utility model can realize the three functions of preheating, evaporation, and superheating in one machine, and has a compact structure, a large heat exchange area per unit volume, high heat transfer efficiency, and the advantages of realizing multi-stream heat exchange. In addition, the steam and water flow in the tube, which can withstand high pressure and improve the steam quality. The molten salt flows outside the tube, and its flow space is large, which can avoid the risk of blockage and is easy to realize large-scale, which can meet the needs of thermal power units combined with molten salt heat storage systems to achieve deep peak regulation.

[0006] As a further improvement of the utility model, a central tube is provided in the inner-stage cylinder, and the two ends of the central tube are respectively fixedly connected to the inlet end baffle and the outlet end baffle, and the inlet through hole is radially located between the inner circle of the inner-stage cylinder and the outer circle of the central tube; the central tube can not only increase the strength and bearing pressure of the inlet end baffle and the outlet end baffle, but also prevent the medium in the inner-stage cylinder from colliding in the radial direction, enhance the heat transfer with the overheated winding tube bundle, and further improve the heat exchange effect;

[0007] As a further improvement of the utility model, the inlet through-hole and the outlet through-hole are both flow-averaging holes, which can improve the uniformity of the medium inflow and outflow and improve the heat exchange effect;

[0008] As a further improvement of the utility model, the preheating inlet, the preheating outlet, the evaporation inlet, the evaporation outlet, the superheating inlet and the superheating outlet are all fixedly connected with orifice plates, and the two ends of the preheating winding tube bundle, the evaporation winding tube bundle and the superheating winding tube bundle are respectively fixedly connected with their own orifice plates; it is convenient to realize the diversion and confluence of steam and water;

[0009] As a further improvement of the utility model, each outlet is closer to the inlet end partition relative to each inlet, so that the steam and the molten salt are in countercurrent heat exchange as a whole, thereby improving the heat exchange efficiency;

[0010] In summary, the utility model can realize the three functions of preheating, evaporation and superheating. It has a compact structure, a large heat exchange area per unit volume, high heat transfer efficiency, and can realize multi-stream heat exchange. It can also improve steam quality, avoid blockage, and is easy to realize large-scale. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is the front view of the embodiment of the utility model. DETAILED DESCRIPTION

[0012] The utility model is further described below in conjunction with the accompanying drawings.

[0013] like Figure 1As shown, a multi-group composite wound tube heat exchanger of this embodiment comprises a shell 1, a medium inlet 2 and a medium outlet 3 welded to both ends of the shell, an inlet end baffle 4 and an outlet end baffle 5 are welded and fixedly connected in the shell 1; an inner dividing cylinder 6 and an outer dividing cylinder 7 are arranged in the shell 1 between the inlet end baffle 4 and the outlet end baffle 5, a center cylinder 8 is arranged in the inner dividing cylinder 6, and both ends of the center cylinder 8 are welded and fixedly connected to the inlet end baffle 4 and the outlet end baffle 5 respectively, one end of the inner dividing cylinder 6 is welded and fixedly connected to the inlet end baffle 4, and the other end is spaced from the outlet end baffle 5. The inlet end partition plate 4 is provided with a plurality of equal flow holes 9 connected to the inner hole of the inner step cylinder 6, and the equal flow holes 9 are radially located between the inner circle of the inner step cylinder 6 and the outer circle of the center cylinder 8; the outer step cylinder 7 is located radially outside the inner step cylinder 6, one end of the outer step cylinder 7 is provided with a gap with the inlet end partition plate 4, and one end thereof is welded and fixedly connected with the outlet end partition plate 5, and the outlet end partition plate 5 is provided with a plurality of equal flow holes 10 connected to the shell cavity radially outside the outer step cylinder 7; a preheating inlet 1 is provided on the shell side wall between the inlet end partition plate 4 and the outlet end partition plate 5. 1. preheating outlet 12, evaporation inlet 13, evaporation outlet 14, superheating inlet 15 and superheating outlet 16. The preheating outlet 12, evaporation outlet 14 and superheating outlet 16 are closer to the inlet end partition plate 4 than the preheating inlet 11, evaporation inlet 13 and superheating inlet 15. A perforated plate 17 is welded and fixedly connected in each inlet and each outlet. A preheating winding tube bundle 18 is arranged in the shell 1 on the radial outer side of the outer dividing cylinder 7. The two ends of the preheating winding tube bundle 18 are respectively welded and connected to the perforated plates 17 in the preheating inlet 11 and the preheating outlet 12. An evaporation winding tube bundle 19 is provided between the pre-evaporation cylinders 6, and the two ends of the evaporation winding tube bundle 19 are respectively connected to the orifice plates in the pre-evaporation inlet 13 and the evaporation outlet 14, and the inlet section of the evaporation winding tube bundle 19 passes through one end of the outer sub-pass cylinder 7 close to the outlet end partition 5; an overheating winding tube bundle 20 is provided in the inner sub-pass cylinder 6, and the overheating winding tube bundle 20 is wound outside the central cylinder 8, and the two ends of the overheating winding tube bundle 20 are respectively connected to the orifice plates in the overheating inlet 15 and the overheating outlet 16, and the outlet section of the overheating winding tube bundle 20 passes through one end of the inner sub-pass cylinder 6 close to the inlet end partition 4;

[0014] When the utility model is used, molten salt is introduced from the medium inlet 2, flows through the shell side, and is discharged through the medium outlet 3; steam and water flow through the pipe side, high-pressure feed water, high-temperature feed water and steam are introduced from the preheating inlet 11, the evaporation inlet 13, and the superheating inlet 15 respectively, and the heat exchange zone in the shell is divided into a preheating section, an evaporation section, and a superheating section through the inlet end partition 4 and the outlet end partition 5, the outer dividing cylinder 7 and the inner dividing cylinder 6. The molten salt folds in the heat exchange zone and flows in the opposite direction to the steam and water, and exchanges heat with the steam and water in each winding tube bundle separately, and the obtained superheated steam is sent to the turbine generator Electricity; The utility model can realize three functions of preheating, evaporation and superheating in one machine. It has a compact structure, a large heat exchange area per unit volume, high heat transfer efficiency, and can realize multi-stream heat exchange. In addition, steam and water go in each winding tube bundle, which can withstand high pressure and improve steam quality. Molten salt goes outside the tube, and its flow space is large, which can avoid the risk of blockage and is easy to realize large-scale, which can meet the needs of thermal power units combined with molten salt heat storage systems to realize deep peak regulation; each outlet is closer to the inlet end partition 4 than each inlet, and the overall heat exchange is countercurrent, which can improve the heat exchange efficiency;

[0015] The central tube 8 can not only increase the strength and bearing pressure of the inlet end baffle 4 and the outlet end baffle 5, but also prevent the molten salt in the inner step cylinder 6 from radially colliding, enhance the heat transfer with the overheated winding tube bundle 20, and further improve the heat exchange effect;

[0016] The flow-averaging holes 9 and 10 are uniformly distributed holes of equal diameter, which can improve the uniformity of the medium inflow and outflow and improve the heat exchange effect;

[0017] The orifice plate 17 facilitates the flow separation and confluence of the soda and water;

[0018] The above embodiments are used for illustration, but it should be understood that the above embodiments are only used for the purpose of example and description, and are not intended to limit the present invention to the scope of the described embodiments.

Claims

1. A multi-group composite wound tube heat exchanger, comprising a shell, a medium inlet and a medium outlet connected to both ends of the shell, and an inlet end baffle and an outlet end baffle fixedly connected to the shell; characterized in that: An inner dividing cylinder and an outer dividing cylinder are arranged in the shell between the inlet end partition and the outlet end partition. One end of the inner dividing cylinder is fixedly connected to the inlet end partition, and one end thereof is arranged with a gap with the outlet end partition. The inlet end partition is provided with a plurality of inlet through holes connected with the inner hole of the inner dividing cylinder; the outer dividing cylinder is located radially outside the inner dividing cylinder, and one end of the outer dividing cylinder is arranged with a gap with the inlet end partition, and one end thereof is fixedly connected to the outlet end partition. The outlet end partition is provided with a plurality of outlet through holes connected with the shell cavity radially outside the outer dividing cylinder; at the inlet end partition A preheating inlet, a preheating outlet, an evaporation inlet, an evaporation outlet, a superheating inlet and a superheating outlet are arranged on the side wall of the shell between the outer and outlet end partitions; a preheating winding tube bundle is arranged in the shell on the radially outer side of the outer split-range cylinder, and the two ends of the preheating winding tube bundle are respectively connected to the preheating inlet and the preheating outlet; an evaporation winding tube bundle is arranged between the outer split-range cylinder and the inner split-range cylinder, and the two ends of the evaporation winding tube bundle are respectively connected to the pre-evaporation inlet and the evaporation outlet; a superheating winding tube bundle is arranged in the inner split-range cylinder, and the two ends of the superheating winding tube bundle are respectively connected to the superheating inlet and the superheating outlet.

2. The multi-group composite wound tube heat exchanger according to claim 1, characterized in that: The inner dividing cylinder is provided with a central cylinder, the two ends of which are respectively fixedly connected to the inlet end partition and the outlet end partition, and the inlet through hole is radially located between the inner circle of the inner dividing cylinder and the outer circle of the central cylinder.

3. The multi-group composite wound tube heat exchanger according to claim 1 or 2, characterized in that: The inlet through hole and the outlet through hole are both flow-sharing holes.

4. The multiple-group composite wound tube heat exchanger according to claim 3, characterized in that: The preheating inlet, preheating outlet, evaporation inlet, evaporation outlet, superheating inlet and superheating outlet are all fixedly connected with orifice plates, and both ends of the preheating winding tube bundle, the evaporation winding tube bundle and the superheating winding tube bundle are respectively fixedly connected with their own orifice plates.

5. The multiple-group composite wound tube heat exchanger according to claim 4, characterized in that: Each outlet is closer to the inlet end partition than each inlet.

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