CN219265104U

CN219265104U - ORC is with integration heat exchanger

Info

Publication number: CN219265104U
Application number: CN202320251575.5U
Authority: CN
Inventors: 岳泽宇; 季瑞轩; 慕清浩
Original assignee: Beijing Huahang Shengshi Energy Technology Co ltd
Current assignee: Beijing Huahang Shengshi Energy Technology Co ltd
Priority date: 2023-02-09
Filing date: 2023-02-09
Publication date: 2023-06-27
Anticipated expiration: 2033-02-09

Abstract

The utility model discloses an ORC integrated heat exchanger, which comprises a shell, a front pipe box, a rear pipe box, a heat exchange pipe, a baffle plate group, a support plate group and a liquid distributor, wherein the front pipe box is connected with the front pipe box; the two ends of the shell are respectively fixed with a tube plate, and a baffle plate group, a support plate group, a liquid separator and a plurality of heat exchange tubes parallel to the length direction of the shell are arranged in the shell; the upper side and the lower side of the front pipe box are respectively provided with a heat source inlet and a sewage outlet; the upper side and the lower side of the rear pipe box are respectively provided with a non-condensable gas discharge port and a heat source outlet; the shell is provided with a working medium outlet and a working medium inlet. The advantages are that: the heat exchange device has the advantages that the situations that the heat exchange effect is poor due to uneven steam distribution and accumulated liquid at the bottom of heat exchange when two-stage steam in a tube side enters a heat exchanger due to the fact that a plurality of devices are connected in series, and the system deviates from the design are improved. The shell adopts sectional design, the front half section adopts countercurrent heat exchange, and the rear half section adopts boiling heat exchange in a pool, so that the heat exchange coefficient of each stage is optimal, and the heat exchange area is minimum.

Description

ORC is with integration heat exchanger

Technical Field

The utility model relates to the technical field of low-temperature power generation, in particular to an integrated heat exchanger for ORC.

Background

The heat exchanger is used as one of key components of the low-temperature organic Rankine cycle generator set, a waste heat source utilized in the design process is taken into a tube pass, an organic working medium is taken into a shell pass, the heat transfer mechanism of the organic working medium in the process from preheating to boiling is considered to be different, the configuration is that two independent heat exchangers of the evaporator and the preheater are respectively connected in series to exchange heat with the heat source, cold and hot fluid between the two heat exchangers is connected by virtue of a pipeline, however, for the project that the waste heat utilization is overheat or saturated steam condensation, the heat source is changed into a gas-liquid two-phase state after the heat exchange of the evaporator, the vapor enters a tube box of the preheater through the pipeline, and the vapor is further distributed into each heat exchange tube of the preheater through the tube box to exchange heat, however, liquid water is accumulated at the lower heat exchange tube of the preheater under the influence of gravity control, the heat exchange efficiency is low due to the change of a heat exchange model, the theoretical calculation area of the preheater is greatly different from actual requirements, and the design and theoretical deviation of the whole system are greatly increased, so that the expected effect cannot be achieved.

Disclosure of Invention

The present utility model aims to provide an integrated heat exchanger for ORC, which solves the aforementioned problems of the prior art.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

an integrated heat exchanger for ORC comprises a shell, a front pipe box, a rear pipe box, heat exchange pipes, a baffle plate group, a support plate group and a liquid distributor; the two ends of the shell are respectively and correspondingly fixed with a tube plate, a baffle plate group, a support plate group, a liquid distributor and a plurality of heat exchange tubes parallel to the length direction of the shell are arranged in the shell, the front tube box and the rear tube box are respectively and fixedly connected with the two tube plates, the heat exchange tubes correspondingly penetrate through the baffle plate group and the support plate group, and the two ends of the heat exchange tubes respectively penetrate through the two tube plates and extend into the front tube box and the rear tube box; the upper side and the lower side of the front pipe box are respectively provided with a heat source inlet and a sewage outlet which are communicated with the inside of the front pipe box; the upper side and the lower side of the rear tube box are respectively provided with a non-condensable gas discharge port and a heat source outlet which are communicated with the inside of the rear tube box; the shell is provided with the working medium export rather than inside intercommunication near the top of preceding pipe case, the shell is provided with rather than inside intercommunication's working medium import near the below of back pipe case.

Preferably, the inside of the shell is divided into a baffle area and a liquid separation area which are adjacent left and right, and the baffle area and the liquid separation area are respectively close to the rear pipe box and the front pipe box; the baffle plate group and the liquid separator are respectively arranged in the baffle area and the liquid separation area.

Preferably, the baffle plate group comprises a plurality of baffle plates which are parallel to the tube plate and are arranged at intervals, the upper ends of the baffle plates are correspondingly attached and fixed with the inner wall of the upper side of the shell, and the lower ends of the baffle plates are at a certain distance from the inner wall of the lower side of the shell; a portion of the heat exchanger passes through the baffle.

Preferably, the supporting plate group comprises a plurality of supporting plates which are parallel to the tube plate and are arranged at intervals, the lower ends of the supporting plates are correspondingly attached and fixed with the inner wall of the lower side of the shell, and the upper ends of the supporting plates are at a certain distance from the inner wall of the upper side of the shell; a part of the heat exchanger passes through the supporting plate; the support plates in the baffle area and the baffle plates are alternately arranged at intervals.

Preferably, the liquid separator comprises a main pipe and branch pipes, one end of the main pipe is connected with a plurality of branch pipes, and the plurality of branch pipes are uniformly distributed in the liquid separation area.

Preferably, a temperature detector is arranged at the heat source inlet.

Preferably, an upper liquid level meter and a lower liquid level meter are respectively arranged on the upper side and the lower side of the shell of the liquid dividing zone.

Preferably, a pressure gauge is arranged on the upper side of the shell.

Preferably, a fixed saddle is arranged at the bottom of the shell close to one end of the rear pipe box, and a movable saddle is arranged at the bottom of the shell close to one end of the front pipe box.

The beneficial effects of the utility model are as follows: 1. the heat exchange device has the advantages that the situations that the heat exchange effect is poor due to uneven steam distribution and accumulated liquid at the bottom of heat exchange when two-stage steam in a tube side enters a heat exchanger due to the fact that a plurality of devices are connected in series, and the system deviates from the design are improved. 2. According to different heat transfer mechanisms under different states of organic working media, the shell adopts sectional design, the first half section adopts countercurrent heat exchange, the second half section adopts boiling heat exchange in a pool, so that the heat exchange coefficient of each stage is optimal, and the heat exchange area is minimum. 3. The two independent evaporators and the preheater of the conventional equipment are integrated into the independent heat exchange equipment while the heat transfer efficiency is ensured, so that various solutions can be provided for unit arrangement, system piping and the like, and meanwhile, the design and construction cost of equipment and pipelines are reduced, and considerable economic benefits are achieved.

Drawings

Fig. 1 is a schematic view of a heat exchanger according to an embodiment of the present utility model.

In the figure: 1. a front pipe box; 2. a tube sheet; 3. a housing; 4. a rear pipe box; 5. fixing the saddle; 6. a baffle plate; 7. a heat exchange tube; 8. a support plate; 9. a movable saddle; 10. a knockout; 11. a working medium inlet; 12. a working medium outlet; 13. a heat source inlet; 14. a heat source outlet; 15. a non-condensable gas discharge port; 16. a sewage outlet; 17. a thermometer; 18. a liquid level meter is arranged; 19. a lower level gauge; 20. a pressure gauge.

Detailed Description

The present utility model will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the detailed description is presented by way of example only and is not intended to limit the utility model.

As shown in fig. 1, in the present embodiment, there is provided an integrated heat exchanger for ORC, comprising a housing 3, a front tube box 1, a rear tube box 4, heat exchange tubes 7, a baffle plate group, a support plate group, and a liquid separator 10; the two ends of the shell 3 are respectively and correspondingly fixed with a tube plate 2, a baffle plate group, a support plate group, a liquid separator 10 and a plurality of heat exchange tubes 7 parallel to the length direction of the shell 3 are arranged in the shell 3, the front tube box 1 and the rear tube box 4 are respectively and fixedly connected with the two tube plates 2, the heat exchange tubes 7 correspondingly penetrate through the baffle plate group and the support plate group, and the two ends of the heat exchange tubes penetrate through the two tube plates 2 respectively and extend into the front tube box 1 and the rear tube box 4; the upper side and the lower side of the front pipe box 1 are respectively provided with a heat source inlet 13 and a sewage outlet 16 which are communicated with the inside of the front pipe box; the upper side and the lower side of the rear pipe box 4 are respectively provided with a non-condensable gas discharge port 15 and a heat source outlet 14 which are communicated with the inside of the rear pipe box; the shell 3 is provided with a working medium outlet 12 communicated with the interior of the front pipe box 1 near the upper side of the front pipe box 1, and a working medium inlet 11 communicated with the interior of the rear pipe box 4 near the lower side of the shell 3.

In this embodiment, the interior of the housing 3 is divided into a baffle area and a liquid separation area which are adjacent left and right, and the baffle area and the liquid separation area are respectively close to the rear pipe box 4 and the front pipe box 1; the baffle plate group and the liquid separator 10 are respectively arranged in the baffle area and the liquid separation area.

The baffle plate group comprises a plurality of baffle plates 6 which are parallel to the tube plate 2 at intervals, the upper ends of the baffle plates 6 are correspondingly attached and fixed with the inner wall of the upper side of the shell 3, and the lower ends of the baffle plates 6 are at a certain distance from the inner wall of the lower side of the shell 3; part of the heat exchanger passes through said baffle 6.

The support plate group comprises a plurality of support plates 8 which are parallel to the tube plate 2 at intervals, the lower ends of the support plates 8 are correspondingly attached and fixed with the inner wall of the lower side of the shell 3, and the upper ends of the support plates 8 are at a certain distance from the inner wall of the upper side of the shell 3; part of the heat exchanger passes through the support plate 8; the support plates 8 in the baffle area are alternately arranged at intervals with the baffle plates 6.

The liquid separator 10 comprises a main pipe and branch pipes, wherein one end of the main pipe is connected with a plurality of branch pipes, and the plurality of branch pipes are uniformly distributed in the liquid separation area. Due to the fact that the supporting plates 8 are arranged in the liquid separation area, the quantity of working media among the adjacent supporting plates 8 is different, the arrangement of the liquid separator 10 can ensure that the quantity of working media among the adjacent supporting plates 8 in the liquid separation area is equal, and the working media are uniformly distributed in the shell 3.

In this embodiment, a thermometer 17 is disposed at the heat source inlet 13, and the thermometer 17 is used for detecting the temperature of the heat source. The upper and lower both sides of the casing 3 of division liquid district are provided with level gauge 18 and lower level gauge 19 respectively, and the level gauge is used for detecting the liquid level height in division liquid district, is convenient for send to the working medium pump and opens and stop, makes working medium pump work guarantee that casing 3 is full of working medium (full liquid state). The upper side of the housing 3 is provided with a pressure gauge 20, the pressure gauge 20 being arranged to detect the evaporation pressure in the housing 3.

In this embodiment, a fixed saddle 5 is disposed at the bottom of the end of the housing 3 near the rear pipe box 4, and a movable saddle 9 is disposed at the bottom of the end of the housing 3 near the front pipe box 1. The arrangement of the fixed saddle 5 and the movable saddle 9 facilitates the installation and maintenance of the heat exchanger.

In this embodiment, the working process of the heat exchanger is as follows:

in operation, the organic working medium enters the shell 3 of the heat exchanger through the working medium inlet 11, and is in a supercooling state, so that the organic working medium needs to exchange heat with a heat source entering the heat exchange tube 7 from the heat source inlet 13 to reach a saturated liquid state, and in order to optimize the heat exchange effect, countercurrent heat exchange is adopted, namely, the working medium entering from the working medium inlet 11 is baffled by the baffle plate 6 and then exchanges heat with a heat source in the heat exchange tube 7 flowing reversely to reach the saturated liquid state, and steam condensate flows out to the downstream through the heat source outlet 14.

The saturated liquid organic working medium is required to be heated to saturated gas in a heat exchanger, a pool boiling (namely, liquid filling) model is adopted in consideration of the phase change heat transfer coefficient of the organic working medium and the vibration failure risk of the heat exchange tube 7 in the medium flowing process, namely, the saturated liquid working medium enters the liquid separator 10 in the heat exchanger, the liquid inside the shell 3 is ensured to be uniformly and stably distributed through the liquid separator 10, other components such as a working medium pump and the like are controlled through detection data of a liquid level meter, the working medium entering the heat exchanger is ensured, the liquid level of the organic working medium completely submerges the heat exchange tube 7, the organic working medium exchanges heat with steam in the heat exchange tube 7 entering from the heat source inlet 13, the organic working medium is heated to saturated gas, enters a downstream driving turbine through the working medium outlet 12, the heat exchange is continued between the heat exchange tube 7 and the liquid organic working medium after the heat exchange is performed, and the steam flows out to the downstream through the heat source outlet 14 after the complete condensation.

In the whole process, steam flows through a single flow after being distributed by the front pipe box 1, a redistribution process is not existed, condensate aggregation is avoided, the risk of heat transfer attenuation of the heat exchanger caused by uneven gaseous distribution is avoided, and the heat transfer effect of the equipment can be ensured. The organic working medium in state adopts pure countercurrent heat exchange, and adopts a nuclear boiling heat transfer mechanism in the tank after heating to saturated liquid state, so that the heat transfer coefficient in each stage is kept optimal, the heat exchange area is smaller, and the equipment size is smaller.

By adopting the technical scheme disclosed by the utility model, the following beneficial effects are obtained:

the utility model provides an integrated heat exchanger for ORC, which is used for improving the situation that a system deviates from design due to poor heat exchange effect caused by uneven steam distribution and accumulated liquid at the bottom of heat exchange when two-stage steam of a tube side enters the heat exchanger because a plurality of devices are connected in series. According to different heat transfer mechanisms under different states of organic working media, the shell adopts sectional design, the first half section adopts countercurrent heat exchange, the second half section adopts boiling heat exchange in a pool, so that the heat exchange coefficient of each stage is optimal, and the heat exchange area is minimum. The two independent evaporators and the preheater of the conventional equipment are integrated into the independent heat exchange equipment while the heat transfer efficiency is ensured, so that various solutions can be provided for unit arrangement, system piping and the like, and meanwhile, the design and construction cost of equipment and pipelines are reduced, and considerable economic benefits are achieved.

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 is also intended to be covered by the present utility model.

Claims

1. An integrated heat exchanger for ORC, characterized in that: comprises a shell, a front pipe box, a rear pipe box, a heat exchange pipe, a baffle plate group, a support plate group and a liquid distributor; the two ends of the shell are respectively and correspondingly fixed with a tube plate, a baffle plate group, a support plate group, a liquid distributor and a plurality of heat exchange tubes parallel to the length direction of the shell are arranged in the shell, the front tube box and the rear tube box are respectively and fixedly connected with the two tube plates, the heat exchange tubes correspondingly penetrate through the baffle plate group and the support plate group, and the two ends of the heat exchange tubes respectively penetrate through the two tube plates and extend into the front tube box and the rear tube box; the upper side and the lower side of the front pipe box are respectively provided with a heat source inlet and a sewage outlet which are communicated with the inside of the front pipe box; the upper side and the lower side of the rear tube box are respectively provided with a non-condensable gas discharge port and a heat source outlet which are communicated with the inside of the rear tube box; the shell is provided with the working medium export rather than inside intercommunication near the top of preceding pipe case, the shell is provided with rather than inside intercommunication's working medium import near the below of back pipe case.

2. The integrated heat exchanger for ORC according to claim 1, wherein: the inside of the shell is divided into a baffle area and a liquid separation area which are adjacent left and right, and the baffle area and the liquid separation area are respectively close to the rear pipe box and the front pipe box; the baffle plate group and the liquid separator are respectively arranged in the baffle area and the liquid separation area.

3. The integrated heat exchanger for ORC according to claim 2, wherein: the baffle plate group comprises a plurality of baffle plates which are parallel to the tube plate and are arranged at intervals, the upper ends of the baffle plates are correspondingly attached and fixed with the inner wall of the upper side of the shell, and the lower ends of the baffle plates are at a certain distance from the inner wall of the lower side of the shell; a portion of the heat exchanger passes through the baffle.

4. An ORC-integrated heat exchanger according to claim 3, wherein: the support plate group comprises a plurality of support plates which are parallel to the tube plate and are arranged at intervals, the lower ends of the support plates are correspondingly attached and fixed with the inner wall of the lower side of the shell, and the upper ends of the support plates are at a certain distance from the inner wall of the upper side of the shell; a part of the heat exchanger passes through the supporting plate; the support plates in the baffle area and the baffle plates are alternately arranged at intervals.

5. The integrated heat exchanger for ORC according to claim 2, wherein: the liquid distributor comprises a main pipe and branch pipes, wherein one end of the main pipe is connected with a plurality of branch pipes, and the branch pipes are uniformly distributed in the liquid distribution area.

6. The integrated heat exchanger for ORC according to claim 1, wherein: and a temperature detector is arranged at the inlet of the heat source.

7. The integrated heat exchanger for ORC according to claim 2, wherein: an upper liquid level meter and a lower liquid level meter are respectively arranged on the upper side and the lower side of the shell of the liquid dividing zone.

8. The integrated heat exchanger for ORC according to claim 1, wherein: the upper side of the shell is provided with a pressure gauge.

9. The integrated heat exchanger for ORC according to claim 1, wherein: the bottom that the casing is close to one end of back pipe case is provided with fixed saddle, the casing is close to the bottom of one end of front pipe case is provided with movable saddle.