Built-in bypass core-pulling type marine waste heat recovery unit

Abstract

The invention relates to a waste heat recovery unit, in particular to a built-in bypass core-pulling type marine waste heat recovery unit, and belongs to the field of marine waste heat recovery. In order to solve the problems that a waste heat recovery device in the prior art has limitation, the integration level is low due to the fact that a heat exchanger and an external bypass are adopted, installation is not facilitated, maintenance is difficult, and the economic cost and time cost of inspection and maintenance are high, the waste heat recovery device comprises an inlet flue, and a silencer used for silencing and reducing noise is arranged at an outlet of the inlet flue. An integrated waste gas baffle structure used for adjusting waste gas flow is arranged at an outlet of the silencer, a pipe box used for waste gas circulation and maintenance is arranged at an outlet of the integrated waste gas baffle structure, a core-pulling heat exchange module used for heat exchange is arranged in the pipe box, and an outlet flue is arranged at an outlet of the pipe box. The inlet flue, the silencer, the integrated waste gas baffle structure, the tube box and the outlet flue are sequentially located in the shell.

Description

TECHNICAL FIELD

[0001] The present application relates to a waste heat recovery unit, in particular to a built-in bypass core-drawing type marine waste heat recovery unit, and belongs to the field of marine waste heat recovery. BACKGROUND

[0002] Gas turbines and diesel engines are traditional ship power and power generation systems, which produce a large amount of high-temperature flue gas during operation. If not effectively recovered and utilized, it will cause energy waste and environmental damage. Marine waste heat recovery technology has gradually become a research hotspot in the current energy field. Waste heat recovery devices, such as exhaust gas boilers, are widely used to recover this part of energy for heating fuel, cabin heating or driving turbine power generation.

[0003] The existing waste heat recovery devices are roughly divided into two categories: one is a single-channel waste heat recovery device, and the other is a waste heat recovery device with an independent flue gas bypass.

[0004] Both of these two types of waste heat recovery devices have some limitations. First, the operating conditions and load changes of the gas turbine or diesel engine will affect the flow and temperature of the high-temperature flue gas. Due to the change of flue gas parameters, the single-channel waste heat recovery device does not have power regulation function, the waste heat recovery efficiency is low, and when the heat exchange tube bundle of the waste heat recovery unit is blocked or corroded and leaks, it is difficult to clean and replace, and needs to be removed as a whole, with long maintenance period, high cost, and affecting the power or power supply of the whole ship. Second, the waste heat recovery device with a heat exchanger plus an external bypass occupies a large space, is heavy, has low integration, is not conducive to installation, and is difficult to maintain, requiring a large area to disassemble the structure of the waste heat recovery device and its auxiliary equipment, with high economic and time costs for inspection and maintenance. SUMMARY

[0005] The present application is to solve the limitations of the existing waste heat recovery device, and the low integration of the heat exchanger plus the external bypass, which is not conducive to installation, difficult to maintain, and has high economic and time costs for inspection and maintenance. A built-in bypass core-drawing type marine waste heat recovery unit is provided.

[0006] The present application provides the following technical solutions to solve the above problems:

[0007] A built-in bypass core-drawing type marine waste heat recovery unit, comprising an inlet flue, an outlet of the inlet flue is provided with a silencer for sound reduction, an outlet of the silencer is provided with an integrated exhaust gas baffle structure for adjusting the flow of exhaust gas, an outlet of the integrated exhaust gas baffle structure is provided with a tube box for circulating exhaust gas and maintenance, the tube box is internally provided with a core-drawing heat exchange module for heat exchange, and an outlet of the tube box is provided with an outlet flue,

[0008] The inlet flue, the silencer, the integrated exhaust gas baffle structure, the tube box and the outlet flue are sequentially located in the shell.

[0009] Further, the integrated exhaust baffle structure comprises a baffle partition wall installed on the inner side wall of the shell and dividing the shell into a main path of exhaust gas flow and a bypass path of exhaust gas flow.

[0010] Further, the integrated exhaust baffle structure further comprises main path vanes and bypass vanes and vane connecting transmission shafts; the main path vanes are installed on the side wall of the shell at the main path of exhaust gas flow through the vane connecting transmission shafts and are used for adjusting the exhaust gas flow of the main path of exhaust gas flow; the bypass vanes are installed on the side wall of the shell at the bypass path of exhaust gas flow through the vane connecting transmission shafts and are used for adjusting the exhaust gas flow of the bypass path of exhaust gas flow.

[0011] Further, the integrated exhaust baffle structure further comprises a mechanical interlocking mechanism and an actuator;

[0012] The vane connecting transmission shafts on the main path vanes and the vane connecting transmission shafts on the bypass vanes are connected with the mechanical interlocking mechanism, and the actuator is connected with the mechanical interlocking mechanism and controls the mechanical interlocking mechanism to drive the vane connecting transmission shafts to rotate.

[0013] Further, the tube box comprises a tube box partition wall, a pin shaft and a top hanging beam; the tube box partition wall is installed on the inner side wall of the shell and divides the shell into a main path channel of exhaust gas flow and a bypass path channel of exhaust gas flow; the top hanging beam is arranged on the shell near the outlet flue; and the core-drawable heat exchange module is installed on the hanging beam through the pin shaft.

[0014] Further, the tube box further comprises a front access door and a rear access door; the front access door and the rear access door are oppositely arranged and installed on the shell on both sides of the core-drawable heat exchange module and are used for replacing and maintaining the core-drawable heat exchange module.

[0015] Further, the core-drawable heat exchange module comprises a tube sheet frame and a heat exchange tube bundle fixed on the tube sheet frame; the heat exchange tube bundle is arranged in a serpentine shape; and the serpentine arrangement of the heat exchange tube bundle improves the heat exchange efficiency between the medium in the heat exchange tube bundle and the exhaust gas.

[0016] Further, the muffler comprises a plurality of rows of sound-absorbing sheets; the rows of sound-absorbing sheets are arranged in parallel; the sound-absorbing sheets are of a porous structure; sound-absorbing material is arranged in the sound-absorbing sheets; and the sound-absorbing sheet shell adopts an internal thermal insulation and external reinforcement structure.

[0017] Further, the baffle partition wall in the shell and the tube box partition wall are arranged in a straight line direction.

[0018] Further, the actuator controls the operation of the mechanical interlocking mechanism; the mechanical interlocking mechanism drives the vane connecting transmission shafts in the main path of exhaust gas flow and the vane connecting transmission shafts in the bypass path of exhaust gas flow to rotate, so as to realize a heat exchange mode of the main path of exhaust gas flow, a heat exchange mode of the bypass path of exhaust gas flow and a mixed mode of the heat exchange of the main path of exhaust gas flow and the heat exchange of the bypass path of exhaust gas flow.

[0019] The technical effect of the present application compared with the prior art is:

[0020] 1. The high compactness and integration of the present application: the bypass channel is built-in in the shell 7, and the integrated exhaust baffle structure 3 is used to eliminate the bulky external bypass flue and damper, greatly reducing the volume and occupied space of the entire system. Compared with the traditional structure, the system has the advantages of convenient maintenance, more flexible waste heat recovery, smaller occupied space, and lighter total weight. The technical solution of the present application has important application value in the fields of waste heat energy recovery of narrow space ships, oil production platforms, and floating power generation ships.

[0021] 2. The present application is more convenient to clean or maintain: the core-pullable design is adopted, when the heat exchange tube bundle needs to be cleaned, inspected or replaced, the core component can be pulled out as a whole by opening the maintenance door, the maintenance work is simple and fast, and the downtime and maintenance cost are greatly reduced.

[0022] 3. The present application runs flexibly and reliably: the built-in integrated damper adjusting mechanism can realize the adjustment of exhaust gas flow and heat exchange capacity, can quickly respond to the change of main engine working condition, protect the safety of equipment, and optimize the efficiency of the entire energy system. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a cross-sectional structure schematic diagram of the waste heat recovery unit of the present application.

[0024] Figure 2 is a side view of the core-pullable heat exchange module 5.

[0025] Figure 3 is a schematic diagram of the integrated flue gas baffle mechanism in the full heat exchange mode in the present application.

[0026] Figure 4 is a schematic diagram of the integrated flue gas baffle mechanism in the mixed mode in the present application.

[0027] Figure 5 is a schematic diagram of the integrated flue gas baffle mechanism in the full bypass mode in the present application. DETAILED DESCRIPTION

[0028] In combination Figure 1 Explain this embodiment, a built-in bypass core-pullable marine waste heat recovery unit, which includes an inlet flue 1, the outlet of the inlet flue 1 is provided with a silencer 2 for noise reduction, the outlet of the silencer 2 is provided with an integrated exhaust baffle structure 3 for adjusting the exhaust gas flow, the outlet of the integrated exhaust baffle structure 3 is provided with a pipe box 4 for circulating exhaust gas and maintenance, the inside of the pipe box 4 is provided with a core-pullable heat exchange module 5 for heat exchange, the outlet of the pipe box 4 is provided with an outlet flue 6,

[0029] The inlet flue 1, silencer 2, integrated exhaust gas baffle structure 3, pipe box 4, and outlet flue 6 are located inside the outer shell 7 in sequence.

[0030] In this embodiment, the heat exchange module and the exhaust gas flow regulation are integrated, which realizes the miniaturization of the equipment, the convenience of maintenance and the flexible switching of the operating mode. The outer shell 7 is a square cylindrical structure.

[0031] Combination Figure 2 As shown, the integrated exhaust gas baffle structure 3 includes a baffle partition wall 31, which is installed on the inner side wall of the housing 7 and divides the exhaust gas flow into a main baffle path 32 and an exhaust gas bypass path 33.

[0032] The baffle wall 31 is used to distribute the flow of exhaust gas entering the heat exchange module.

[0033] Combination Figure 1 , Figures 3 to 5 As shown, the integrated exhaust gas baffle structure 3 also includes a main path blade 34, a bypass blade 35, and a blade connecting drive shaft 36. The main path blade 34 is installed on the side wall of the housing 7 at the main path of the baffle 32 via the blade connecting drive shaft 36, and is used to adjust the exhaust gas flow rate of the main path of the baffle 32. The bypass blade 35 is installed on the side wall of the housing 7 at the bypass path of the baffle 33 via the blade connecting drive shaft 36, and is used to adjust the exhaust gas flow rate of the bypass path of the baffle 33.

[0034] The main blade 34 and the bypass blade 35 are rotatable rectangular damper plates, which are connected to the drive shaft 36 for rotation. There are two or three main blades 34 and one or two bypass blades 35.

[0035] Combination Figure 1 , Figures 3 to 5 As shown, the integrated exhaust gas baffle structure 3 also includes a mechanical interlock mechanism 37 and an actuator 38;

[0036] Both the blade connecting drive shaft 36 on the main blade 34 and the blade connecting drive shaft 36 on the bypass blade 35 are connected to the mechanical interlocking mechanism 37. The actuator 38 is connected to the mechanical interlocking mechanism 37 and controls the mechanical interlocking mechanism 37 to drive the blade connecting drive shaft 36 to rotate.

[0037] In this embodiment, the actuator 38 is an electric, pneumatic, or hydraulic actuator, fixed to the integrated flue gas damper frame. The two ends of the blade connecting drive shaft 36 are respectively connected to an external mechanical interlocking mechanism 37, which performs interlocking control to simultaneously close the main path and open the bypass path.

[0038] Combination Figures 1 to 5As shown, the tube box 4 comprises a tube box partition wall 41, a pin shaft 44 and a top hanging beam 45, the tube box partition wall 41 is installed on the inner side wall of the shell 7 and divides the shell 7 into a main passage 42 for waste gas flow and a bypass passage 43 for waste gas flow, and the top hanging beam 45 is arranged on the shell 7 near the outlet flue 6, and the core pullable heat exchange module 5 is installed on the hanging beam 45 through the pin shaft 44.

[0039] In combination Figures 1 to 2 As shown, the tube box 4 further comprises a front access door 46 and a rear access door 47, the front access door 46 and the rear access door 47 are oppositely arranged on the shell 7 on both sides of the core pullable heat exchange module 5, and are used for replacement and maintenance of the core pullable heat exchange module 5. When maintenance is needed, the core pullable heat exchange module 5 can be pulled out along the length direction of the tube bundle from the shell by opening the access door, without the need of disassembling the whole device or cutting the pipeline.

[0040] In combination Figures 2 to 5 As shown, the core pullable heat exchange module 5 comprises a tube plate frame 51 and a heat exchange tube bundle 52 fixed on the tube plate frame 51, and the heat exchange tube bundle 52 is arranged in a serpentine shape, and the serpentine arrangement of the heat exchange tube bundle 52 improves the heat exchange efficiency between the medium in the heat exchange tube bundle 52 and the waste gas.

[0041] In the embodiment, the tube plate frame 51 is suspended in the main passage 42, heat exchange is performed on the medium in the heat exchange tube bundle 52, and heat is recovered through the medium in the heat exchange tube bundle 52, and when cleaning or maintenance is needed, the tube plate frame 51 can be pulled out by disconnecting the heat exchange tube bundle 52 from the external pipeline, so that the cleaning or maintenance can be performed, thereby realizing the core pullable function.

[0042] In combination Figure 1 As shown, the silencer 2 comprises a plurality of rows of sound-absorbing sheets 21, the plurality of rows of sound-absorbing sheets 21 are arranged in parallel, the sound-absorbing sheet 21 has a porous structure, and the sound-absorbing sheet 21 is internally lined with sound-absorbing material 22, and the shell of the sound-absorbing sheet 21 adopts an internal thermal insulation and external reinforcement structure.

[0043] In combination Figure 1 As shown, the baffle partition wall 31 in the shell 7 and the tube box partition wall 41 are arranged in a linear direction.

[0044] In combination Figures 3 to 5 As shown, the actuator 38 controls the operation of the mechanical interlocking mechanism 37, the mechanical interlocking mechanism 37 drives the rotation of the blade connection transmission shaft 36 in the baffle main passage 32 and the blade connection transmission shaft 36 in the waste gas flow bypass passage 33, so as to realize the working mode of the baffle main passage 32 heat exchange, the working mode of the baffle bypass passage 33 and the mixed mode of the baffle main passage 32 heat exchange and the baffle bypass passage 33 working.

[0045] In this embodiment, when the main baffle 32 is in heat exchange mode, the damper plate of the bypass blade 35 is completely closed, and the damper plate of the main baffle 34 is open, so that all the exhaust gas flows through the main baffle 32 and undergoes full heat exchange through the heat exchange module 5 that can be extracted.

[0046] In the working mode of the baffle bypass 33, the damper plate of the bypass blade 35 is fully open, the damper plate of the main blade 34 is closed, the exhaust gas of the baffle bypass 33 flows through the inlet of the baffle bypass 33 channel, and the heat exchange module 5 can be pulled out without heat exchange.

[0047] In the mixed mode of heat exchange in the main baffle 32 and the bypass baffle 33, the damper plate of the main baffle blade 34 and the damper plate of the bypass baffle blade 35 are adjusted by the actuator 38 to make the exhaust gas flow proportionally. Part of it flows through the bypass baffle 33 and part of it enters the main baffle 32 to exchange heat with the heat exchange tube bundle 52 of the heat exchange module 5, so that the waste heat recovery unit always operates within the power range required by the user.

[0048] Working principle:

[0049] The high-temperature exhaust gas emitted by the gas turbine or diesel engine enters the waste heat recovery unit from the inlet flue 1, and flows sequentially through the silencer 2, the integrated exhaust gas baffle structure 3, the pipe box 4, the heat exchange module with extractable core 5, and the outlet flue 6 before being discharged into the atmosphere.

[0050] When maximum heat recovery is required, such as Figure 3 As shown, the actuator 38 controls the mechanical interlock mechanism 37 to rotate the blades connected to the drive shaft 36 to bring the main blade 34 to a vertical position, while simultaneously bringing the bypass blade 35 to a horizontal position to completely block the entrance of the bypass channel 43. All the high-temperature exhaust gas is forced to flow through the main blade 34 and over the outside of the serpentine heat exchange tube bundle 52, transferring heat to the medium inside the heat exchange tube bundle 52, such as water or oil. The exhaust gas at the end of the heat exchange is discharged from the main channel 42.

[0051] When some calories are needed, such as Figure 4 As shown, the actuator 38 controls the mechanical interlock mechanism 37 to rotate the blades connected to the transmission shaft 36 so that the main blade 34 is at a certain angle, such as 30°, and at the same time, the bypass blade 35 is at a corresponding angle, such as 60°, so that part of the waste gas enters the bypass channel 43, and the other part of the waste gas flows through the heat exchange tube bundle 52 for heat exchange. The waste gas at the end of the heat exchange is discharged from the main channel 42, realizing precise adjustment of the waste heat recovery.

[0052] When the waste heat recovery unit is shut down or requires isolation for maintenance, such as Figure 5As shown, the actuator 38 controls the mechanical interlocking mechanism 37 to rotate the blade connection drive shaft 36 to make the main passage blade 34 to the horizontal position to completely block the entrance of the main passage 42, while making the bypass blade 35 to the vertical horizontal position to completely open, the exhaust gas directly passes through the built-in bypass passage 43, without heat exchange, directly to the outlet flue 6.

Claims

1. A marine waste heat recovery unit with built-in bypass and core-extractable design, characterized in that: It includes an inlet flue (1), the outlet of the inlet flue (1) is provided with a silencer (2) for noise reduction, the outlet of the silencer (2) is provided with an integrated exhaust gas baffle structure (3) for regulating the exhaust gas flow, the outlet of the integrated exhaust gas baffle structure (3) is provided with a pipe box (4) for circulating exhaust gas and maintenance, the inside of the pipe box (4) is provided with a heat exchange module (5) for heat exchange, and the outlet of the pipe box (4) is provided with an outlet flue (6). The inlet flue (1), silencer (2), integrated exhaust gas baffle structure (3), pipe box (4) and outlet flue (6) are located inside the outer shell (7) in sequence.

2. The marine waste heat recovery unit with built-in bypass and core-extractable design according to claim 1, characterized in that: The integrated exhaust gas baffle structure (3) includes a baffle partition wall (31), which is installed on the inner side wall of the outer shell (7) and divides the exhaust gas flow into a baffle main path (32) and an exhaust gas bypass path (33).

3. The marine waste heat recovery unit with built-in bypass and core-extractable design according to claim 2, characterized in that: The integrated exhaust gas baffle structure (3) also includes a main path blade (34), a bypass blade (35), and a blade connecting drive shaft (36). The main path blade (34) is installed on the side wall of the housing (7) at the main path (32) of the baffle through the blade connecting drive shaft (36) to regulate the exhaust gas flow of the main path (32). The bypass blade (35) is installed on the side wall of the housing (7) at the bypass path (33) of the baffle through the blade connecting drive shaft (36) to regulate the exhaust gas flow of the bypass path (33).

4. The marine waste heat recovery unit with built-in bypass and core-extractable design according to claim 3, characterized in that: The integrated exhaust gas baffle structure (3) also includes a mechanical interlock mechanism (37) and an actuator (38); The blade connecting drive shaft (36) on the main blade (34) and the blade connecting drive shaft (36) on the bypass blade (35) are both connected to the mechanical interlocking mechanism (37). The actuator (38) is connected to the mechanical interlocking mechanism (37) and controls the mechanical interlocking mechanism (37) to drive the blade connecting drive shaft (36) to rotate.

5. The marine waste heat recovery unit with built-in bypass and core-extractable design according to claim 1, characterized in that: The tube box (4) includes a tube box partition wall (41), a pin shaft (44) and a top hanging beam (45). The tube box partition wall (41) is installed on the inner side wall of the outer shell (7) and divides the flow inside the outer shell (7) to form the main channel (42) for the flow of exhaust gas and the bypass channel (43) for the flow of exhaust gas. The top hanging beam (45) is on the outer shell (7) near the outlet flue (6). The heat exchange module (5) that can be extracted is installed on the hanging beam (45) through the pin shaft (44).

6. The marine waste heat recovery unit with built-in bypass and core-extractable design according to claim 5, characterized in that: The tube box (4) also includes a front inspection door (46) and a rear inspection door (47). The front inspection door (46) and the rear inspection door (47) are installed opposite to each other on the outer shell (7) on both sides of the heat exchange module (5) for the replacement and maintenance of the heat exchange module (5).

7. A marine waste heat recovery unit with built-in bypass and core-extractable design according to claim 1 or 6, characterized in that: The heat exchange module (5) with removable core includes a tube sheet frame (51) and a heat exchange tube bundle (52) fixed on the tube sheet frame (51). The heat exchange tube bundle (52) is arranged in a serpentine pattern, which improves the heat exchange efficiency between the medium and the exhaust gas in the heat exchange tube bundle (52).

8. A marine waste heat recovery unit with built-in bypass and core-extractable design according to claim 1 or 6, characterized in that: The silencer (2) includes multiple rows of sound-absorbing plates (21), which are arranged in parallel. The sound-absorbing plates (21) have a porous structure and are lined with sound-absorbing material (22). The shell of the sound-absorbing plates (21) adopts an internal insulation and external reinforcement structure.

9. A marine waste heat recovery unit with built-in bypass and core-extractable design according to claim 2 or 5, characterized in that: The inner baffle partition (31) of the outer shell (7) and the partition wall (41) of the pipe box are extended in a straight line.

10. A marine waste heat recovery unit with built-in bypass and core-extractable design according to claim 4, characterized in that: The actuator (38) controls the mechanical interlock mechanism (37) to work. The mechanical interlock mechanism (37) drives the blades in the main baffle (32) connected to the drive shaft (36) and the blades in the bypass baffle (33) for the flow of exhaust gas to rotate, thereby realizing the working mode of heat exchange in the main baffle (32), the working mode of the bypass baffle (33), and the mixed mode of heat exchange in the main baffle (32) and the working mode of the bypass baffle (33).

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