CN117514447A - Heat exchange device, marine engine system and control method - Google Patents

Abstract

The invention belongs to the technical field of heat exchange, and particularly relates to a heat exchange device, a marine engine system and a control method. The heat exchange device includes: the heat exchange units each comprise a first inlet, a first outlet, a second inlet and a second outlet, a first passage communicated with the first inlet and the first outlet and a second passage communicated with the second inlet and the second outlet are arranged in the heat exchange units, and the first passages are in thermal coupling connection with the second passages; the seawater circulating pipeline is connected with the plurality of heat exchange units in parallel in a detachable mode; and the plurality of heat exchange units are detachably connected in parallel on the cooling liquid flow pipeline. The invention can only disassemble and maintain the abnormal heat exchange unit when the heat exchange device is abnormal, thereby effectively reducing the maintenance cost of the heat exchange device.

Description

Heat exchange device, marine engine system and control method

Technical Field

The invention belongs to the technical field of heat exchange, and particularly relates to a heat exchange device, a marine engine system and a control method.

Background

This section provides merely background information related to the present disclosure and is not necessarily prior art.

The marine engine is provided with a heat exchange device, and the heat exchange device is used for cooling the high-temperature cooling liquid by utilizing the low-temperature seawater. Because seawater contains more impurities and pollutants, the heat exchange device used by the marine engine is usually a detachable plate type heat exchange device so as to detach, clean and recycle the heat exchanger. However, since the marine engine has large volume and large cooling liquid capacity, the heat exchange device has large volume, the marine engine is required to be stopped firstly in the process of maintaining the heat exchanger, and the heat exchange device can be disassembled after the cooling liquid in the heat exchange device is discharged, the cooling liquid in the heat exchange device can reach thousands of liters, and the discharging time is long. In addition, in the case that only a few fins of the heat exchange device are blocked or damaged, all cooling liquid is required to be emptied and all fins of the heat exchange device are required to be disassembled, and all sealing parts are required to be replaced, so that huge labor and material costs are consumed in each maintenance process of the heat exchange device.

Disclosure of Invention

The invention aims to at least solve the problems that the marine engine needs to be stopped and the maintenance cost is high in the maintenance process of the heat exchange device. The aim is achieved by the following technical scheme:

a first aspect of the present invention proposes a heat exchange device for a marine engine system, the heat exchange device comprising:

a plurality of heat exchange units, each comprising a first inlet, a first outlet, a second inlet and a second outlet, wherein the interior of the heat exchange unit is provided with a first passage communicated with the first inlet and the first outlet and a second passage communicated with the second inlet and the second outlet, and the first passage is in thermal coupling connection with the second passage;

the plurality of heat exchange units are detachably connected in parallel to the seawater circulation pipeline, and the first passage of each heat exchange unit is communicated with the seawater circulation pipeline through the first inlet and the first outlet respectively;

and the plurality of heat exchange units are detachably connected in parallel to the cooling liquid flow pipeline, and the second passage of each heat exchange unit is communicated with the cooling liquid flow pipeline through the second inlet and the second outlet respectively.

According to the heat exchange device, the plurality of heat exchange units are connected in parallel on the seawater flow pipeline, when at least one heat exchange unit in the plurality of heat exchange units is blocked, the blocked heat exchange unit can be determined by detecting the seawater flow condition in each heat exchange unit, and the blocked heat exchange unit can be disassembled and maintained only by cutting off the passage between the seawater flow pipeline and the blocked heat exchange unit, so that the whole engine system is not required to be shut down after the refrigerating fluid in the whole heat exchange device is discharged, and the labor and material costs of the maintenance of the heat exchange device are effectively reduced, and the stable operation of the whole engine system is realized without shutdown.

In addition, the heat exchange device according to the present invention may further have the following additional technical features:

in some embodiments of the present invention, the seawater circulation pipeline includes a first liquid inlet pipe, a first liquid return pipe, a plurality of first branch pipelines and a plurality of second branch pipelines, the first branch pipelines and the second branch pipelines are respectively in one-to-one correspondence with the heat exchange units, the first branch pipelines communicate the first inlet with the first liquid inlet pipe, the second branch pipelines communicate the first outlet with the first liquid return pipe, and the first branch pipelines and/or the second branch pipelines are provided with first control valves.

In some embodiments of the present invention, the cooling liquid flow pipeline includes a second liquid inlet pipe, a second liquid return pipe, a plurality of third branch pipelines and a plurality of fourth branch pipelines, the third branch pipelines and the fourth branch pipelines are respectively in one-to-one correspondence with the heat exchange units, the third branch pipelines communicate the second inlet with the second liquid inlet pipe, the fourth branch pipelines communicate the second outlet with the second liquid return pipe, and the third branch pipelines and/or the fourth branch pipelines are provided with second control valves.

In some embodiments of the invention, the inlet of the first liquid inlet pipe and/or the outlet of the first liquid return pipe is provided with a flow meter.

In some embodiments of the present invention, the inlet of the first liquid inlet pipe and the outlet of the first liquid return pipe are respectively provided with a water pressure sensor.

A second aspect of the present invention proposes a marine engine system comprising:

an engine including a cooling passage including a coolant inlet and a coolant outlet;

in the first aspect of the invention, any heat exchange device is provided, the second liquid inlet pipe of the heat exchange device is communicated with the cooling liquid outlet, and the second liquid return pipe of the heat exchange device is communicated with the cooling liquid inlet.

A third aspect of the present invention proposes a control method of a heat exchange device for controlling any one of the heat exchange devices proposed in the first aspect of the present invention, the control method comprising:

determining whether the heat exchange device is in an abnormal state;

according to the abnormal state of the heat exchange device, controlling the seawater to flow independently in each heat exchange unit;

and determining the heat exchange unit in an abnormal state according to the condition that the seawater independently circulates in each heat exchange unit.

In some embodiments of the invention, the determining whether the heat exchange device is in an abnormal state includes:

acquiring the liquid inlet flow of the seawater circulating pipeline;

and determining that the heat exchange device is in an abnormal state according to the fact that the inflow flow rate is higher than the maximum value of the preset flow rate range or lower than the minimum value of the preset flow rate range.

In some embodiments of the invention, the control seawater is circulated separately in each of the heat exchange units, comprising:

and controlling seawater to flow in each heat exchange unit independently at a preset flow rate.

In some embodiments of the present invention, the heat exchange unit in an abnormal state according to the case that seawater separately circulates in each of the heat exchange units includes:

the method comprises the steps of obtaining the liquid inlet pressure and the liquid outlet pressure of seawater when the seawater independently circulates in each heat exchange unit;

and determining that the heat exchange unit corresponding to the liquid inlet pressure and the liquid outlet pressure is in an abnormal state according to the fact that the pressure difference between the liquid inlet pressure and the liquid outlet pressure is larger than a preset pressure difference.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

fig. 1 schematically shows a view from the inlet and outlet side of a seawater circulation line of a heat exchange device according to an embodiment of the present invention;

fig. 2 schematically illustrates a view of a heat exchange device according to an embodiment of the present invention at an inlet and outlet side of a coolant circulation pipe;

fig. 3 schematically shows a schematic view of a heat exchange device according to another embodiment of the invention.

Fig. 4 schematically shows a control flow diagram of a heat exchange device according to an embodiment of the invention.

Fig. 5 schematically shows a control flow diagram of a specific example of a heat exchange device according to an embodiment of the invention.

The reference numerals are as follows: 1. a heat exchange unit; 21. a first liquid inlet pipe; 22. a first liquid return pipe; 23. a first branch pipe; 24. a second branch pipe; 31. a second liquid inlet pipe; 32. a second liquid return pipe; 33. a third pipeline; 34. a fourth pipeline; 4. a cooling liquid recovery pipeline; 41. a recycling branch pipeline; 5. a cooling liquid recovery tank; 6. a first control valve; 7. a second control valve; 8. a flow meter; 9. a water pressure sensor; 10. a second pumping means; 11. and a third control valve.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For ease of description, spatially relative terms, such as "inner," "outer," "lower," "below," "upper," "above," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.

The following detailed description of the technical solutions of the present embodiment is given with reference to the accompanying drawings, and the following embodiments and examples may be combined with each other without conflict.

According to an embodiment of the present invention, as shown in fig. 1 and 2, a heat exchange device for a marine engine system is provided, the heat exchange device including a plurality of heat exchange units 1, a seawater circulation line and a coolant circulation line, the heat exchange units 1 including a first inlet (not shown), a first outlet (not shown), a second inlet (not shown) and a second outlet (not shown), the heat exchange units 1 having a first passage (not shown) communicating the first inlet and the first outlet, and a second passage (not shown) communicating the second inlet and the second outlet, the first passage being thermally coupled to the second passage. Each heat exchange unit 1 comprises a plurality of fins which are arranged in a stacked manner, and four corner holes, namely a first inlet, a first outlet, a second inlet and a second outlet, are formed in the fins so as to allow two liquids for heat transfer to pass through. The fins are installed in a frame having a fixed plate and a movable hold-down plate on one side and are clamped by clamping bolts. The plates are provided with sealing gaskets which seal the fluid channels and guide the fluid to flow alternately into the respective flow channels to form heat exchange.

The seawater circulation pipeline is used for circulating seawater, the seawater circulation pipeline is communicated with the first passage of each heat exchange unit 1, the plurality of heat exchange units 1 are detachably connected in parallel on the seawater circulation pipeline, the first passage of each heat exchange unit 1 is respectively communicated with the seawater circulation pipeline through the first inlet and the first outlet, that is, an independent seawater flow path is formed between the seawater circulation pipeline and each heat exchange unit 1, and the seawater in the seawater circulation pipeline can circulate in the first passage of the corresponding heat exchange unit 1 through the independent seawater flow path. The cooling liquid flow pipeline is used for circulating cooling liquid, the plurality of heat exchange units 1 are connected in parallel on the cooling liquid flow pipeline in a detachable mode, and the second passage of each heat exchange unit 1 is respectively communicated with the cooling liquid flow pipeline through the second inlet and the second outlet, namely an independent cooling liquid flow path is formed between the cooling liquid flow pipeline and each heat exchange unit 1, and cooling liquid in the cooling liquid flow pipeline can circulate in the second passage of the corresponding heat exchange unit 1 through the independent cooling liquid flow path. In an example, the seawater flow line and the coolant flow line are further provided with first pumping means (not shown in the figure), respectively, by means of which seawater or coolant is pumped into the plurality of heat exchange units 1, for example mechanical pumps or electric seawater pumps.

The number of the heat exchange units 1 is not limited in this embodiment, and the number of the heat exchange units 1 can be flexibly designed according to the heat exchange performance and the production cost of the heat exchange device, for example, 3, 4, 6 or other numbers of the heat exchange units 1.

According to the embodiment, the plurality of heat exchange units 1 are connected in parallel on the seawater flow pipeline, when at least one heat exchange unit 1 in the plurality of heat exchange units 1 is blocked, the blocked heat exchange units 1 are determined by detecting the seawater flow condition in each heat exchange unit 1, and the abnormal heat exchange units 1 can be detached and maintained only by disconnecting the passage between the seawater flow pipeline and the blocked heat exchange units 1, so that the cooling liquid in the whole heat exchange device is not required to be discharged, all the heat exchange units 1 are detached, and an engine system arranged by the heat exchange device is not required to be stopped, so that the labor cost and the material cost for maintaining the heat exchange device are effectively reduced, and the non-stop stable operation of the whole engine system is realized.

In some embodiments, as shown in fig. 1 and 2, the seawater circulation pipeline includes a first liquid inlet pipe 21, a first liquid return pipe 22, a plurality of first branch pipelines 23 and a plurality of second branch pipelines 24, where the first branch pipelines 23 and the second branch pipelines 24 are respectively in one-to-one correspondence with the heat exchange unit 1, the first branch pipelines 23 communicate the first inlet with the first liquid inlet pipe 21, the second branch pipelines 24 communicate the first outlet with the first liquid return pipe 22, the first control valve 6 is disposed on the first branch pipelines 23, or the first control valve 6 is disposed on the second branch pipelines 24, or the first control valves 6 are disposed on the first branch pipelines 23 and the second branch pipelines 24. When the heat exchange device is abnormal such as blockage or leakage, the first control valve 6 can control the seawater to flow independently in each heat exchange unit 1, and the abnormal heat exchange unit 1 can be determined according to the flow condition of the seawater in each heat exchange unit 1. The first control valve 6 is for example a mechanical valve or an electrically controlled valve. The first branch pipeline 23, the second branch pipeline 24 and the heat exchange unit 1 can be detachably connected in a plug connection or flange connection mode.

The determination of the clogging situation of the heat exchange unit 1 will be described in detail below in connection with specific examples.

In an example, as shown in fig. 1 and 2, the heat exchange device includes three heat exchange units 1, and referring to the orientation shown in fig. 1, the heat exchange unit 1 located at the left side is the first heat exchange unit 1, the heat exchange unit 1 located at the middle is the second heat exchange unit 1, and the heat exchange unit 1 located at the right side is the third heat exchange unit 1. When the engine system is in normal operation, all the first control valves 6 are in an open state, and after the seawater in the first liquid inlet pipe 21 enters the first passage through the first inlet of each heat exchange unit 1, heat exchange is performed between the seawater in the first liquid inlet pipe and the cooling liquid in the second passage in the heat exchange units 1, and then the seawater enters the first liquid return pipe 22 through the first outlet. When the abnormal condition of the heat exchange device is judged by monitoring the circulation conditions such as the pressure, the flow rate and the like of the first liquid inlet and/or the first liquid return pipe 22, the first control valve 6 corresponding to the first heat exchange unit 1 is kept open, the first control valves 6 corresponding to the second heat exchange unit 1 and the third heat exchange unit 1 are closed, at this time, the seawater circulates in the first heat exchange unit 1 only, and whether the first heat exchange unit 1 is abnormal or not can be determined according to the change conditions such as the pressure, the flow rate and the like when the seawater circulates in the first heat exchange unit 1. After the abnormal condition of the first heat exchange unit 1 is determined, the first control valves 6 corresponding to the first heat exchange unit 1 and the third heat exchange unit 1 are closed, the first control valves 6 corresponding to the second heat exchange unit 1 are opened, the abnormal condition of the second heat exchange unit 1 is determined in the same manner as the abnormal condition of the first heat exchange unit 1 is determined, after the abnormal condition of the second heat exchange unit 1 is determined, the first control valves 6 corresponding to the first heat exchange unit 1 and the second heat exchange unit 1 are closed, the first control valves 6 corresponding to the third heat exchange unit 1 are opened, and the abnormal condition of the third heat exchange unit 1 is determined in the same manner as the abnormal condition of the first heat exchange unit 1 is determined, so that whether the abnormal condition of blockage or leakage occurs in all the heat exchange units 1 can be determined. Of course, the opening and closing of the corresponding first control valve 6 may also be controlled according to the determined sequence of the abnormal conditions of the third heat exchange unit 1, the second heat exchange unit 1 and the first heat exchange unit 1, and will not be described herein.

In other realizable manners, the first control valve 6 may also be disposed on the first liquid outlet pipe and/or the first liquid return pipe 22 and located between the two heat exchange units 1, when determining the blocking condition of the plurality of heat exchange units 1, the first control valve 6 between the first heat exchange unit 1 and the second heat exchange unit 1 and between the second heat exchange unit 1 and the third heat exchange unit 1 may be controlled to be closed first, and the seawater separately circulates in the first heat exchange unit 1, so that the abnormal condition of the first heat exchange unit 1 may be determined. After the abnormal condition of the first heat exchange unit 1 is determined, the first control valve 6 between the first heat exchange unit 1 and the second heat exchange unit 1 is opened, and seawater flows between the first heat exchange unit 1 and the second heat exchange unit 1 at the same time, so that the abnormal condition of the second heat exchange unit 1 can be determined. After the abnormal condition of the second heat exchange unit 1 is determined, the first control valve 6 between the second heat exchange unit 1 and the third heat exchange unit 1 is controlled to be opened, and at this time, the abnormal condition of the third heat exchange unit 1 can be determined.

In some embodiments, as shown in fig. 1 and 2, the cooling liquid flow pipeline includes a second liquid inlet pipe 31, a second liquid return pipe 32, a plurality of third branch pipelines 33 and a plurality of fourth branch pipelines 34, the third branch pipelines 33 and the fourth branch pipelines 34 are respectively in one-to-one correspondence with the heat exchange unit 1, the third branch pipelines 33 communicate the second inlet with the second liquid inlet pipe 31, the fourth branch pipelines 34 communicate the second outlet with the second liquid return pipe 32, the second control valve 7 is arranged on the third branch pipelines 33, or the second control valve 7 is arranged on the fourth branch pipelines 34, or the second control valve 7 is arranged on each of the third branch pipelines 33 and the fourth branch pipelines 34. After determining the abnormal heat exchange unit 1, the second control valve 7 corresponding to the blocked heat exchange unit 1 can be closed to cut off the cooling liquid circulation flow path between the cooling liquid circulation pipeline and the abnormal heat exchange unit 1, so that only the abnormal heat exchange unit 1 is required to be disassembled and maintained, and the engine system is not required to be stopped and the cooling liquid in the whole heat exchange device is not required to be discharged. The second control valve 7 is, for example, a mechanical valve or an electric control valve, and the third branch pipeline 33, the fourth branch pipeline 34 and the heat exchange unit 1 can be detachably connected in a plug connection or flange connection mode.

In some embodiments, as shown in fig. 1 and 2, the flow meter 8 is disposed at the inlet of the first liquid inlet pipe 21 and/or the outlet of the first liquid return pipe 22, and whether the heat exchange device is blocked or leaked or not may be determined according to the flow value detected by the flow meter 8.

In some embodiments, as shown in fig. 1 and 2, the water pressure sensors 9 are respectively arranged at the inlet of the first liquid inlet pipe 21 and the outlet of the first liquid return pipe 22, and when the seawater is controlled to flow to one of the heat exchange units 1 independently, the abnormal heat exchange unit 1 is determined by monitoring the pressure difference data of the first liquid inlet pipe 21 and the first liquid return pipe 22. In other possible ways, it is also possible to provide the water pressure sensor 9 on the first branch line 23 and the second branch line 24 respectively corresponding to each heat exchange unit 1 in order to determine the clogging situation of the corresponding heat exchange unit 1,

in some embodiments, as shown in fig. 3, the heat exchange device of the present embodiment includes a cooling liquid recovery tank 5, a cooling liquid recovery line 4, and a recovery branch line 41, where the cooling liquid recovery line 4 is connected to the cooling liquid recovery tank 5, the recovery branch line 41 is in one-to-one correspondence with the third branch line 33 or the fourth branch line 34, one end of the recovery branch line 41 is connected to the third branch line 33, the other end is connected to the cooling liquid recovery line 4, or one end of the recovery branch line 41 is connected to the fourth branch line 34, and the other end is connected to the cooling liquid recovery line 4. The third control valve 11 is arranged on the recovery branch pipeline 41, the second pumping device 10 is further arranged on the cooling liquid recovery pipeline 4, when the heat exchange unit 1 with abnormal conditions needs to be disassembled and maintained, the third control valve 11 on the recovery branch pipeline 41 of the heat exchange unit 1 with abnormal conditions is opened, and under the action of the second pumping device 10, cooling liquid in the heat exchange unit 1 with abnormal conditions flows into the cooling liquid recovery pipeline 4 through the corresponding recovery branch pipeline 41 and is finally collected into a recovery tank. After the heat exchange unit 1 is reassembled, the refrigerant can be pumped into the newly assembled heat exchange unit 1 again through the pumping device, the normal operation of other heat exchange units 1 is not affected in the whole refrigerant recovery process and the refrigerant reinjection process of the refrigerant into the heat exchange unit 1, on one hand, the discharge efficiency of the refrigerant in the abnormal heat exchange unit 1 is improved, the discharged refrigerant is recovered and reused, on the other hand, the heat exchange of the heat exchange device is ensured, and the stable operation of the whole engine system without stopping is realized.

According to an embodiment of the present invention, a marine engine system (not shown in the drawings) is provided, the engine system includes an engine, the engine includes a cooling channel, the cooling channel includes a cooling liquid inlet and a cooling liquid outlet, the cooling channel is used for circulating cooling liquid, so as to absorb heat generated in an engine operation process, and ensure stable operation of the engine. The engine system further comprises any one of the heat exchange devices provided in the above embodiment, the second liquid inlet pipe 31 of the heat exchange device is communicated with the cooling liquid outlet, the second liquid return pipe 32 of the heat exchange device is communicated with the cooling liquid inlet, so that the cooling liquid in the engine flows into the heat exchange device, heat exchange is carried out between the heat exchange device and the seawater entering the heat exchange device, the seawater absorbing the heat of the cooling liquid flows into the sea again, and the cooling liquid absorbed by the seawater flows into the cooling channel of the engine again, and the cooling liquid is reciprocated to form a cooling liquid circulation loop.

The heat exchange device in the engine system of the present embodiment combines a plurality of fins into one heat exchange unit 1, and a plurality of heat exchange units 1 into a heat exchange device. Each heat exchange unit 1 is connected in parallel, the first control valve 6 is arranged on the first branch pipeline 23 and/or the second branch pipeline 24 corresponding to each heat exchange unit 1, the second control valve 7 is arranged on the third branch pipeline 33 and/or the fourth branch pipeline 34, and when maintenance is needed, the first control valve 6 and the second control valve 7 corresponding to the heat exchange unit 1 which needs to be maintained are closed independently, and then the heat exchange units are disassembled, so that the engine stop is not needed. The first liquid outlet pipe and/or the first liquid return pipe 22 of the seawater circulation pipeline are/is provided with the flowmeter 8, and when the flow value detected by the flowmeter 8 is abnormal, the occurrence of the abnormality such as blockage or leakage in the heat exchange device can be judged. According to the control strategy and the flow and pressure data of the first pumping device on the whole machine, the specific heat exchange unit 1 can be judged to be abnormal, all cooling liquid in the engine system is not required to be discharged, all fins are not required to be replaced, only the faulty heat exchange unit 1 is required to be replaced, the engine system is not required to be stopped, and a large amount of labor and material cost is saved.

According to an embodiment of the present invention, a control method of a heat exchange device is provided, where the control method is used to control any one of the heat exchange devices provided in the first aspect of the present invention, fig. 4 schematically illustrates a control flow chart of the heat exchange device according to the embodiment of the present invention, and referring to fig. 4, the control method includes the following steps:

s41, determining whether the heat exchange device is in an abnormal state;

s42, controlling the seawater to flow independently in each heat exchange unit 1 according to the abnormal state of the heat exchange device;

s43, determining the heat exchange unit 1 in an abnormal state according to the condition that the seawater independently flows in each heat exchange unit 1.

In the present embodiment, the abnormal state of the heat exchange device is, for example, a clogged state or a leaking state. When the heat exchange device is in an abnormal state, the flow rate and the pressure of the seawater flowing into the heat exchange device are changed. In an example, the flow meter 8 is disposed at the inlet of the seawater circulation line, and the heat exchange device is determined to be in an abnormal state by acquiring the inflow flow rate of the seawater circulation line detected by the flow meter 8, and then determining that the heat exchange device is in an abnormal state according to whether the inflow flow rate is higher than the maximum value of the preset flow rate range or lower than the minimum value of the preset flow rate range. Specifically, when the inlet flow rate is higher than the maximum value of the preset flow rate range, the heat exchange device is indicated to be in abnormal blockage, and when the inlet flow rate is lower than the minimum value of the preset flow rate range, the heat exchange device is indicated to be in abnormal leakage. When the inflow flow is in the preset flow range, the heat exchange device is in a normal state.

After determining that the heat exchange device is in an abnormal state, it is necessary to further determine the heat exchange unit 1 in an abnormal state in the heat exchange device. At this time, the first control valve 6 corresponding to each heat exchange unit 1 may be controlled to allow the seawater to flow in each heat exchange unit 1 alone, and the heat exchange unit 1 in an abnormal state may be determined according to the flow of the seawater in each heat exchange unit 1. The circulation of the seawater in the heat exchange units 1 is, for example, a flow rate change or a pressure change of the seawater flowing in each heat exchange unit 1. In an example, the water pressure sensors 9 are respectively arranged at the inlet of the first liquid inlet pipe 21 and the outlet of the first liquid return pipe 22, when the seawater is controlled to flow independently in each heat exchange unit 1, the liquid inlet pressure and the liquid outlet pressure of the seawater when the seawater flows independently in each heat exchange unit 1 are obtained, and the abnormal condition of the heat exchange units 1 is determined according to the pressure difference of the liquid inlet pressure and the liquid outlet pressure. For example, according to the fact that the pressure difference between the liquid inlet pressure and the liquid outlet pressure is larger than the preset pressure difference, it is indicated that the heat exchange unit 1 is blocked or leaked abnormally at the moment, and it can be determined that the heat exchange unit 1 corresponding to the liquid inlet pressure and the liquid outlet pressure is in an abnormal state. When the pressure difference between the inlet pressure and the outlet pressure is smaller than or equal to the preset pressure difference, it indicates that the external pipeline or the monitoring device, such as the flow sensor or the water pressure sensor 9, is abnormal, and at this time, the abnormal condition of the external pipeline or the monitoring device needs to be checked.

In some embodiments, the pressure difference data of each heat exchange unit 1 under the preset flow rate can be calibrated in advance as a reference basis, then after the heat exchange device is determined to be in an abnormal state, seawater can be controlled to flow in each heat exchange unit 1 independently at the preset flow rate, and then the pressure difference of the determined inlet pressure and the determined outlet pressure is compared with the calibrated pressure difference data of the preset flow rate, so that the accuracy of judging the abnormal condition of the heat exchange units 1 is improved.

The flow of confirming the heat exchange unit 1 in which an abnormal situation occurs of the present embodiment is explained in detail below with reference to a specific example.

In combination with the heat exchange device of fig. 1, the heat exchange device comprises three heat exchange units 1, referring to the orientation shown in fig. 1, the heat exchange unit 1 located at the left side is the first heat exchange unit 1, the heat exchange unit 1 located in the middle is the second heat exchange unit 1, the heat exchange unit 1 located at the right side is the third heat exchange unit 1, and when the engine system is in normal operation, all the first control valves 6 are in an open state. Fig. 5 schematically shows a control flow diagram of a specific example of a heat exchange device according to an embodiment of the invention, with reference to fig. 5, comprising the steps of:

s51, acquiring the liquid inlet flow of a seawater circulating pipeline;

s52, judging whether the flow rate of the inlet fluid is higher than the maximum value of a preset flow rate range, if yes, entering S53, and if no, enabling the heat exchange unit 1 to be free of abnormality and not required to be processed;

s53, controlling the circulation of the seawater at a preset flow rate, closing a first control valve 6 corresponding to the second heat exchange unit 1 and the third heat exchange unit 1, acquiring the liquid inlet pressure and the liquid outlet pressure of the seawater when the seawater singly circulates in the first heat exchange unit 1, determining the first pressure difference between the liquid inlet pressure and the liquid outlet pressure, and entering S54;

s54, judging whether the first pressure difference is larger than the pressure difference under the preset flow, if so, determining that the first heat exchange unit 1 is abnormal, if not, entering S55;

s56, controlling the circulation of the seawater at a preset flow rate, closing a first control valve 6 corresponding to the first heat exchange unit 1 and the third heat exchange unit 1, acquiring the liquid inlet pressure and the liquid outlet pressure of the seawater when the seawater singly circulates in the second heat exchange unit 1, determining the second pressure difference between the liquid inlet pressure and the liquid outlet pressure, and entering S56;

s56, judging whether the second pressure difference is larger than the pressure difference under the preset flow, if so, determining that the second heat exchange unit 1 is abnormal, if not, entering S57;

s57, controlling the circulation of the seawater at a preset flow rate, closing a first control valve 6 corresponding to the first heat exchange unit 1 and the second heat exchange unit 1, acquiring the liquid inlet pressure and the liquid outlet pressure of the seawater when the seawater singly circulates in the third heat exchange unit 1, determining the third pressure difference between the liquid inlet pressure and the liquid outlet pressure, and entering S58;

s58, judging whether the third pressure difference is larger than the pressure difference under the preset flow, if so, determining that the third heat exchange unit 1 is abnormal, if not, entering S59;

s59, checking the abnormality of the external pipeline or the monitoring equipment.

According to the embodiment, the abnormal condition of the heating unit in the heat exchange device can be identified independently, when the heat exchange unit 1 is abnormal, the abnormal heat exchange unit 1 is only required to be disassembled for maintenance, the engine is not required to be stopped, and the cooling liquid of the whole heat exchange device is not required to be discharged, so that the maintenance cost of the heat exchange device can be reduced effectively, and the stable operation of the whole engine system without stopping is realized.

The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims (10)

1. A heat exchange device for a marine engine system, the heat exchange device comprising:

a plurality of heat exchange units, each comprising a first inlet, a first outlet, a second inlet and a second outlet, wherein the interior of the heat exchange unit is provided with a first passage communicated with the first inlet and the first outlet and a second passage communicated with the second inlet and the second outlet, and the first passage is in thermal coupling connection with the second passage;

the plurality of heat exchange units are detachably connected in parallel to the seawater circulation pipeline, and the first passage of each heat exchange unit is communicated with the seawater circulation pipeline through the first inlet and the first outlet respectively;

and the plurality of heat exchange units are detachably connected in parallel to the cooling liquid flow pipeline, and the second passage of each heat exchange unit is communicated with the cooling liquid flow pipeline through the second inlet and the second outlet respectively.

2. The heat exchange device according to claim 1, wherein the seawater circulation line comprises a first liquid inlet pipe, a first liquid return pipe, a plurality of first branch lines and a plurality of second branch lines, the first branch lines and the second branch lines are respectively in one-to-one correspondence with the heat exchange units, the first branch lines communicate the first inlet with the first liquid inlet pipe, the second branch lines communicate the first outlet with the first liquid return pipe, and the first branch lines and/or the second branch lines are provided with first control valves.

3. The heat exchange device according to claim 1, wherein the coolant flow line includes a second liquid inlet pipe, a second liquid return pipe, a plurality of third branch pipes and a plurality of fourth branch pipes, the third branch pipes and the fourth branch pipes are respectively in one-to-one correspondence with the heat exchange units, the third branch pipes communicate the second inlet with the second liquid inlet pipe, the fourth branch pipes communicate the second outlet with the second liquid return pipe, and the third branch pipes and/or the fourth branch pipes are provided with second control valves.

4. The heat exchange device according to claim 2, wherein the inlet of the first feed pipe and/or the outlet of the first return pipe is provided with a flow meter.

5. The heat exchange device of claim 4, wherein water pressure sensors are respectively disposed at the inlet of the first liquid inlet pipe and the outlet of the first liquid return pipe.

6. A marine engine system, the engine system comprising:

an engine including a cooling passage including a coolant inlet and a coolant outlet;

the heat exchange device of any one of claims 1-5, wherein a second feed pipe of the heat exchange device is in communication with the cooling fluid outlet, and a second return pipe of the heat exchange device is in communication with the cooling fluid inlet.

7. A control method of a heat exchange device, characterized in that the control method is for controlling the heat exchange device according to any one of claims 1 to 5, the control method comprising:

determining whether the heat exchange device is in an abnormal state;

according to the abnormal state of the heat exchange device, controlling the seawater to flow independently in each heat exchange unit;

and determining the heat exchange unit in an abnormal state according to the condition that the seawater independently circulates in each heat exchange unit.

8. The method of controlling a heat exchange device according to claim 7, wherein the determining whether the heat exchange device is in an abnormal state includes:

acquiring the liquid inlet flow of the seawater circulating pipeline;

and determining that the heat exchange device is in an abnormal state according to the fact that the inflow flow rate is higher than the maximum value of the preset flow rate range or lower than the minimum value of the preset flow rate range.

9. The control method of a heat exchange device according to claim 7, wherein the control seawater individually circulates in each of the heat exchange units, respectively, comprising:

and controlling seawater to flow in each heat exchange unit independently at a preset flow rate.

10. The control method of a heat exchange apparatus according to claim 7, wherein the determining the heat exchange unit in an abnormal state according to the case where seawater separately circulates in each of the heat exchange units, respectively, comprises:

the method comprises the steps of obtaining the liquid inlet pressure and the liquid outlet pressure of seawater when the seawater independently circulates in each heat exchange unit;

and determining that the heat exchange unit corresponding to the liquid inlet pressure and the liquid outlet pressure is in an abnormal state according to the fact that the pressure difference between the liquid inlet pressure and the liquid outlet pressure is larger than a preset pressure difference.