CN211084515U - Flexible direct current transmission offshore platform heat recycling system - Google Patents
Flexible direct current transmission offshore platform heat recycling system Download PDFInfo
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- CN211084515U CN211084515U CN201921979023.6U CN201921979023U CN211084515U CN 211084515 U CN211084515 U CN 211084515U CN 201921979023 U CN201921979023 U CN 201921979023U CN 211084515 U CN211084515 U CN 211084515U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
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Abstract
The utility model relates to a heat recycling system of a flexible direct current power transmission offshore platform, which comprises a heat pump module and a seawater desalination module which are connected in sequence; the heat pump module is used for absorbing heat emitted by a heat source in the flexible direct current power transmission offshore platform; the seawater desalination module is used for preparing fresh water by utilizing the heat. The utility model provides a technical scheme carries out the heat energy grade to the heat loss of flexible direct current transmission offshore platform and promotes, and this energy of recycle is desalinated the sea water, reaches the energy saving and reduces capital cost's purpose.
Description
Technical Field
The utility model relates to a heat recovery field, concretely relates to flexible direct current transmission offshore platform heat recovery utilizes system.
Background
For offshore wind power and cross-sea power transmission, the power transmission end of the flexible direct current power transmission project is located on the sea, and an offshore platform needs to be built to bear power transmission devices such as a converter valve. Converter valve conversion is core equipment of direct current transmission engineering, and expected direct current voltage and power control are achieved by sequentially connecting three-phase alternating current voltage to a direct current end; converter valves are subjected to high voltage and high current surges during operation, which can generate as much as megawatts of heat.
The cooling system of the offshore platform converter valve generally adopts a three-cycle mode, and in consideration of the problem of equipment corrosion, a fresh water circulating system for isolating water circulation and deionized water cooling liquid is added in the converter valve cooling system, so that fresh water needs to be continuously supplemented in the operation process of the converter valve (the fresh water circulating system is supplemented to consume and prepare deionized water), and fresh water needs to be provided for life of operation maintenance personnel, so that the offshore platform needs to be regularly and remotely conveyed with fresh water, and the operation maintenance cost is high. In addition, the converter valve is low in heat grade (the outlet temperature is 50-60 ℃), so that the recycling difficulty is high. The existing heat recovery design scheme does not improve the heat grade of the converter valve, is only used for supplying heat, and has the defects of low utilization efficiency, single utilization mode and the like.
SUMMERY OF THE UTILITY MODEL
The utility model provides a not enough to prior art, the utility model aims at providing a flexible direct current transmission offshore platform heat recovery utilizes system carries out the heat energy grade to the converter valve loss and promotes, and this energy of recycle is desalinated the sea water, for converter valve cooling system and operation maintainer life provide the fresh water source, avoids long distance marine transport, reaches the energy saving and reduces the purpose of capital cost.
The utility model provides a heat recycling system of a flexible direct current power transmission offshore platform, which is improved in that the heat recycling system comprises a heat pump module and a seawater desalination module which are connected in sequence;
the heat pump module is used for absorbing heat emitted by a heat source in the flexible direct current power transmission offshore platform;
the seawater desalination module is used for preparing fresh water by utilizing the heat;
the heat pump modules are connected to the heat source in series or in parallel.
Preferably, the heat source includes: the system comprises a converter valve, a fresh water circulating system, a converter valve cooling system and a seawater circulating system.
Preferably, the heat pump module includes: an evaporator, a heat pump compressor, a condenser and a throttle valve;
a first input end of the evaporator is connected with a cooling medium carrying heat emitted by a heat source in the flexible direct-current power transmission offshore platform;
a first output end of the evaporator flows out of the cooling medium cooled by the refrigerant through a pipeline, and a second output end of the evaporator is connected with an input end of the heat pump compressor;
the output end of the heat pump compressor is connected with the first input end of the condenser;
the first output end of the condenser is connected with the input end of the throttle valve, and the second output end of the condenser is connected with the first input end of the evaporative condenser in the seawater desalination module;
and the output end of the throttle valve is connected with the second input end of the evaporator.
Further, the cooling medium includes: deionized water, fresh water or seawater.
Further, the seawater desalination module comprises: the system comprises a first water pump, a second water pump, a third water pump, a first preheater, a second preheater, an evaporative condenser and a compressor;
the first water pump inputs seawater to a first input end of the first preheater and a first input end of the second preheater respectively;
the first output end of the first preheater is connected with the second input end of the condenser;
the first output end of the second preheater is connected with the second input end of the condenser;
the first output port of the evaporative condenser is connected with the input port of the compressor;
the output port of the compressor is connected with the second input port of the evaporative condenser;
a first output port of the evaporative condenser is connected with a second input port of the first preheater;
a second output port of the first preheater is connected with the second water pump;
a second output port of the evaporative condenser is connected with a second input port of the second preheater;
and a second output port of the second preheater is connected with the third water pump.
Compared with the closest prior art, the utility model discloses beneficial effect who has:
the utility model discloses a flexible direct current transmission offshore platform heat recovery utilizes system improves its heat energy grade with the heat of converter valve (or fresh water circulation system, converter valve cooling system, sea water circulation system) through heat pump system, then utilizes its drive sea water desalination system work, provides fresh water for the life of production. The heat recycling system provided by the utility model solves the problem of heat utilization of the converter valve on one hand, avoids the converter valve from being directly discharged into the atmosphere, saves energy, and reduces the heat load of the converter valve cooling system and the capital investment of related equipment; on the other hand, the problem of fresh water required by the offshore platform for production and life is solved, the original long-distance offshore transportation is avoided, and the cost is saved. In addition, the heat pump system and the seawater desalination system are conventional products, do not need special design and customization, and are beneficial to popularization and application in engineering.
Drawings
Fig. 1 is a schematic structural diagram of a heat recycling system of a flexible direct current power transmission offshore platform provided by the present invention;
fig. 2 is the embodiment of the utility model provides an add three circulation circuit converter valve cooling system schematic diagrams for offshore platform of flexible direct current transmission offshore platform heat recovery system.
Detailed Description
The following describes the present invention in further detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Direct outside environment emission's design technical shortcoming to the loss (heat) that traditional flexible direct current offshore platform converter valve (or fresh water circulation system, converter valve cooling system, sea water circulation system) produced, the utility model relates to a flexible direct current offshore platform converter valve loss is retrieved and is absorbed sea water desalination system carries out the heat energy grade to the converter valve loss and promotes, and recycle carries out sea water desalination. The system mainly comprises the following two parts: a heat pump system and a seawater desalination system. An evaporator in the heat pump system absorbs heat exhausted by the converter valve, works on the heat, improves the heat energy grade of the heat, and then drives the seawater desalination system to operate by the high-grade heat so as to provide fresh water for life of a converter valve cooling system and an offshore platform. The utility model effectively utilizes the heat of the converter valve, recycles the heat, reduces the heat load of the cooling system of the converter valve and achieves the effect of seawater desalination; the utility model discloses can avoid long distance marine transport for converter valve cooling system and operation maintainer life provide the fresh water source, reach the energy saving and reduce capital cost purpose. The heat pump system and the seawater desalination system are conventional products, do not need special design and customization, and are beneficial to popularization and application in engineering.
Specifically, as shown in fig. 1, the heat recycling system includes a heat pump module and a seawater desalination module which are connected in sequence;
the heat pump module is used for absorbing heat emitted by a heat source in the flexible direct current power transmission offshore platform;
the seawater desalination module is used for preparing fresh water by utilizing the heat.
Wherein the heat pump modules are connected to the heat source in series or in parallel, the heat source comprising: the system comprises a converter valve, a fresh water circulating system, a converter valve cooling system and a seawater circulating system.
The utility model provides an in the best embodiment, add three circulation system schematic diagrams of offshore platform heat recovery system as shown in figure 2, offshore platform heat recovery system can absorb a part of heat of converter valve, is used for preparing fresh water, can provide fresh water for fresh water circulation system and converter valve cooling system among the three circulation system on the one hand for cooling cycle and deionized water preparation, on the other hand can reduce three circulation heat loads to reduce three circulation economic cost. The offshore platform heat recovery device can be placed in any circulation of the three-circulation system in a serial or parallel mode, the heat recovery device is only connected in series to the converter valve cooling system in the mode shown in figure 2, and the specific position can be adjusted according to the actual environment of the offshore platform.
Further, in the heat recovery system as shown in fig. 1, the heat pump module includes: an evaporator, a heat pump compressor, a condenser and a throttle valve;
a first input end of the evaporator is connected with a cooling medium carrying heat emitted by a heat source in the flexible direct-current power transmission offshore platform;
the first output end of the evaporator flows out of the cooling medium cooled by the refrigerant through a pipeline, and the second output end of the evaporator outputs the refrigerant absorbing heat to the input end of the heat pump compressor;
the output end of the heat pump compressor compresses the refrigerant accessed from the input end of the heat pump compressor and outputs the compressed refrigerant to the first input end of the condenser;
the condenser condenses and liquefies the refrigerant accessed by the first input end of the condenser through the seawater accessed by the second input end of the condenser, outputs the condensed and liquefied refrigerant to the input end of the throttling valve through the first output end of the condenser, and outputs the seawater used for condensing and liquefying to the first input end of the evaporation condenser in the seawater desalination module through the second output end of the condenser;
and the output end of the throttle valve throttles the refrigerant expansion valve connected to the input end of the throttle valve and outputs the throttled refrigerant expansion valve to the second input end of the evaporator.
Wherein the cooling medium includes: deionized water, fresh water or seawater.
The seawater desalination module comprises: the system comprises a first water pump, a second water pump, a third water pump, a first preheater, a second preheater, an evaporative condenser and a compressor;
the first water pump inputs seawater to a first input end of the first preheater and a first input end of the second preheater respectively;
the first output end of the first preheater heats the seawater accessed from the first input end and outputs the heated seawater to the second input end of the condenser;
the first output end of the second preheater heats the seawater accessed from the first input end and outputs the heated seawater to the second input end of the condenser;
the evaporative condenser evaporates the seawater accessed from the first input end into steam, and inputs the steam to the input port of the compressor through the first output port of the evaporative condenser;
the compressor returns the pressurized vapor to a second input port of the evaporative condenser through an output port thereof;
the evaporative condenser exchanges heat between the steam accessed by the second input port of the evaporative condenser and the seawater and condenses the steam into fresh water, and the fresh water is output to the second input port of the first preheater through the first output port;
the first preheater exchanges heat between the fresh water accessed by the second input port of the first preheater and the seawater accessed by the first input port, cools the fresh water, and outputs the cooled fresh water to the second water pump through the second output port of the first preheater;
the evaporative condenser outputs the seawater which is not evaporated in the evaporation chamber of the evaporative condenser to a second input port of the second preheater through a second output port of the evaporative condenser;
the second preheater exchanges heat between the unevaporated seawater accessed by the second input port and the seawater accessed by the first input port, reduces the temperature and outputs the seawater to the third water pump through the second output port.
Wherein the temperature of the seawater is raised to 50-80 ℃ after passing through the first preheater, the second preheater and the condenser.
The working principle of the heat recycling system is as follows:
in the application scenario as shown in fig. 1, the heat pump system adopts a vapor compression refrigeration cycle principle, that is, a low-pressure refrigerant gas at the outlet of an evaporator is compressed by a compressor and then becomes a high-temperature high-pressure refrigerant gas, then enters a condenser to be condensed and liquefied into a high-pressure low-temperature liquid, then is throttled and decompressed by an expansion valve into a low-temperature low-pressure gas-liquid mixture, enters an evaporator, and then is evaporated to absorb heat of a cooling circuit in a converter valve, and becomes a low-temperature low-pressure gas, which enters the compressor, thereby completing a thermodynamic cycle. Because the condensation temperature at the condenser end is high, the high-temperature heat source of the condenser can be used for driving the seawater desalination system.
In the application scenario shown in fig. 1, the feed seawater of the seawater desalination system enters the evaporation-condenser after being preheated by the first preheater and the second preheater (the temperature is raised to 50 ℃) and the heat pump condenser (the temperature is raised to 60 ℃), part of the seawater is evaporated into steam, the steam passes through the filtering device and is pressurized by the compressor, the pressure is increased, the steam enters the condensation pipeline, the steam exchanges heat with the seawater outside the pipe wall and is condensed into liquid water, and the released latent heat and sensible heat are used for heating the seawater outside the pipe. The condensed water is output as product fresh water after part of sensible heat is recovered by the first preheater; the concentrated seawater which is not evaporated in the evaporation chamber is recycled by the second preheater and then is discharged.
In the application scenario shown in fig. 2, high-temperature liquid in the three-circulation system of the offshore platform enters the hot side of the evaporator, is cooled to the required liquid supply temperature, and then enters the three-circulation system through the driving of the water pump to realize one circulation. At this time, part of the heat generated by the heat exchange valve is absorbed by the evaporator in the heat pump system.
The utility model has the characteristics of provide to the thermal recycle technique of offshore platform converter valve (or fresh water circulating system, converter valve cooling system, sea water circulating system), pass through heat pump system with the heat of converter valve (or fresh water circulating system, converter valve cooling system, sea water circulating system) and improve its heat energy grade, then utilize its drive sea water desalination work, provide fresh water for the life of production. The heat recovery absorption refrigeration system provided by the utility model solves the problem of utilizing the heat of the converter valve, avoids the converter valve from being directly discharged into the atmosphere, saves energy, and reduces the heat load of the cooling system of the converter valve (or a fresh water circulating system, a converter valve cooling system and a seawater circulating system) and the capital investment of related equipment; on the other hand, the problem of fresh water required by the offshore platform for production and life is solved, the original long-distance offshore transportation is avoided, and the cost is saved. In addition, the heat pump system and the seawater desalination system are conventional products, do not need special design and customization, and are beneficial to popularization and application in engineering.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents of the embodiments of the invention may be made without departing from the spirit and scope of the invention, which should be construed as falling within the scope of the claims of the invention.
Claims (5)
1. A heat recycling system of a flexible direct current power transmission offshore platform is characterized by comprising a heat pump module and a seawater desalination module which are sequentially connected;
the heat pump module is used for absorbing heat emitted by a heat source in the flexible direct current power transmission offshore platform;
the seawater desalination module is used for preparing fresh water by utilizing the heat;
the heat pump modules are connected to the heat source in series or in parallel.
2. The system of claim 1, wherein the heat source comprises: the system comprises a converter valve, a fresh water circulating system, a converter valve cooling system and a seawater circulating system.
3. The system of claim 1, wherein the heat pump module comprises: an evaporator, a heat pump compressor, a condenser and a throttle valve;
a first input end of the evaporator is connected with a cooling medium carrying heat emitted by a heat source in the flexible direct-current power transmission offshore platform;
a first output end of the evaporator flows out of the cooling medium cooled by the refrigerant through a pipeline, and a second output end of the evaporator is connected with an input end of the heat pump compressor;
the output end of the heat pump compressor is connected with the first input end of the condenser;
the first output end of the condenser is connected with the input end of the throttle valve, and the second output end of the condenser is connected with the first input end of the evaporative condenser in the seawater desalination module;
and the output end of the throttle valve is connected with the second input end of the evaporator.
4. The system of claim 3, wherein the cooling medium comprises: deionized water, fresh water or seawater.
5. The system of claim 3, wherein the seawater desalination module comprises: the system comprises a first water pump, a second water pump, a third water pump, a first preheater, a second preheater, an evaporative condenser and a compressor;
the first water pump inputs seawater to a first input end of the first preheater and a first input end of the second preheater respectively;
the first output end of the first preheater is connected with the second input end of the condenser;
the first output end of the second preheater is connected with the second input end of the condenser;
the first output port of the evaporative condenser is connected with the input port of the compressor;
the output port of the compressor is connected with the second input port of the evaporative condenser;
a first output port of the evaporative condenser is connected with a second input port of the first preheater;
a second output port of the first preheater is connected with the second water pump;
a second output port of the evaporative condenser is connected with a second input port of the second preheater;
and a second output port of the second preheater is connected with the third water pump.
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| CN201921979023.6U CN211084515U (en) | 2019-11-15 | 2019-11-15 | Flexible direct current transmission offshore platform heat recycling system |
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| CN201921979023.6U CN211084515U (en) | 2019-11-15 | 2019-11-15 | Flexible direct current transmission offshore platform heat recycling system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112759011A (en) * | 2020-12-31 | 2021-05-07 | 中谷宏(海南)实业有限公司 | Low-temperature evaporation seawater desalination device without vacuum pump |
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- 2019-11-15 CN CN201921979023.6U patent/CN211084515U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112759011A (en) * | 2020-12-31 | 2021-05-07 | 中谷宏(海南)实业有限公司 | Low-temperature evaporation seawater desalination device without vacuum pump |
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