A waste heat energy recovery system for converter valves based on heat pipe technology

Abstract

The present invention discloses a waste heat energy recovery system for a converter valve based on heat pipe technology. The system includes a main circulation loop, a capillary network heat recovery system, a fresh air heat recovery system, and a seawater cooling system; the main circulation loop includes an internal cooling main circulation water pump connected to the outlet of the converter valve bridge arm, a first heat exchange pipeline, a second heat exchange pipeline, and a third heat exchange pipeline that are sequentially connected in series at the outlet end of the internal cooling main circulation water pump, and the other end of the third heat exchange pipeline is connected to the inlet of the converter valve bridge arm; a branch of the first heat exchange pipeline exchanges heat with the fresh air heat recovery system through a water-air type heat pipe heat exchanger; a branch of the second heat exchange pipeline exchanges heat with the capillary network heat recovery system through a water-water type plate heat exchanger. The present invention is used when the outdoor temperature at sea is too low in winter, makes full use of the waste heat of the converter valve, reduces waste, preheats the fresh air system, and heats the office rooms by using capillaries at the same time.

Description

Technical Field

[0001] The present invention relates to a heat recovery system, and in particular to a waste heat energy recovery system for converter valves based on heat pipe technology. Background Art

[0002] As the key electrical equipment of an offshore converter station, since a large amount of heat is generated during their operation, a large number of cooling systems need to be configured to remove the heat, preventing the components on the converter valves from being damaged due to overheating. Currently, in general, an offshore converter station uses a seawater cooling system to discharge the heat of the converter valves into the seawater through two-stage plate heat exchangers to ensure the operation stability and service life.

[0003] The heat generation of the converter valve tower is very large. Currently, the heat is discharged into the seawater through cooling water. During actual operation, when the outdoor temperature in winter is too low in the valve hall and other electrical rooms, there is a need to preheat the fresh air, and at the same time, there is a heating demand in offices and other rooms in winter. How to effectively utilize the waste heat of the converter valves and reduce energy waste has become extremely urgent. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present invention proposes a waste heat energy recovery system for converter valves based on heat pipe technology, which uses the waste heat of the converter valves for preheating the fresh air in the valve hall and capillary heating in the office, realizing the recovery and utilization of energy and avoiding energy waste.

[0005] The present invention provides a waste heat energy recovery system for converter valves based on heat pipe technology, which system includes a main circulation loop, a capillary network heat recovery system, a fresh air heat recovery system, and a seawater cooling system;

[0006] The main circulation loop includes an internal cooling main circulation water pump connected to the outlet of the converter valve bridge arm, a first heat exchange pipeline, a second heat exchange pipeline, and a third heat exchange pipeline that are sequentially connected in series at the outlet end of the internal cooling main circulation water pump, and the other end of the third heat exchange pipeline is connected to the inlet of the converter valve bridge arm;

[0007] The first heat exchange pipeline includes a main path of the first heat exchange pipeline and a branch of the first heat exchange pipeline, and the branch of the first heat exchange pipeline exchanges heat with the fresh air heat recovery system through a water-air type heat pipe heat exchanger;

[0008] The second heat exchange pipeline includes a main path of the second heat exchange pipeline and a branch of the second heat exchange pipeline, and the branch of the second heat exchange pipeline exchanges heat with the capillary network heat recovery system through a water-water type plate heat exchanger;;

[0009] An internal cooling main circulation water pump is provided at the outlet of the converter valve bridge arm;

[0010] The third heat exchange pipeline exchanges heat with the seawater cooling system through a fresh water - internal cooling water plate heat exchanger.

[0011] Further, a three - way regulating valve V1 is provided at the junction of the inlet end of the first heat exchange pipeline branch, the main path of the first heat exchange pipeline, and the first heat exchange pipeline branch. A check valve and a first regulating valve V2 are provided between the outlet end of the water - air type heat pipe exchanger and the outlet end of the first heat exchange pipeline branch.

[0012] Further, the check valve is provided on one side close to the outlet end of the water - air type heat pipe exchanger, and the first regulating valve V2 is provided on one side close to the outlet end of the first heat exchange pipeline branch.

[0013] Further, the fresh air heat recovery system includes a fresh air inlet pipeline connected to the water - air type heat pipe exchanger, a combined air handling unit connected to the outlet end of the fresh air inlet pipeline, a supply air duct connected to the outlet end of the combined air handling unit, and hot air is sent out from the outlet end of the supply air duct, and the hot air is used to heat the valve hall.

[0014] Further, two second regulating valves (V3, V4) are respectively provided at the inlet and outlet ends of the second heat exchange pipeline.

[0015] Further, a valve V5 for overhauling the second heat exchange pipeline branch is provided on the main path of the second heat exchange pipeline.

[0016] Further, the capillary network heat recovery system includes a capillary network heat recovery system inlet and an outlet respectively connected to both ends of the water - water type plate heat exchanger. The capillary network heat recovery system inlet is connected to a capillary network. The outlet of the capillary network is sequentially connected to a heat recovery circulating water pump and a filter, and the outlet of the filter is connected to the water - water type plate heat exchanger. A water replenishing mechanism is also provided on the pipeline at the inlet of the heat recovery circulating water pump.

[0017] Further, the water replenishing mechanism includes a water replenishing tank located at the outlet of the capillary network, a water replenishing pump located at the outlet of the water replenishing tank for adjusting the water flow rate, and an expansion tank for storing water.

[0018] Further, the material of the capillary network is PPR plastic.

[0019] Further, a fresh water cooling system for preventing seawater from entering the third heat exchange pipeline is also provided between the third heat exchange pipeline and the seawater cooling system.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. The present invention utilizes heat pipe technology to make full use of the waste heat of the converter valve and reduce waste when the outdoor temperature at sea is too low in winter. It preheats the fresh air system of the room equipped with a combined air conditioning unit, and at the same time uses capillary tubes to supply heat to rooms such as offices.

[0022] 2. The present invention sets a three-way regulating valve in front of the water-air type heat pipe heat exchanger to recover the waste heat of the converter valve in advance. At the same time, a branch of the first heat exchange pipeline is added to recover the waste heat of the converter valve in advance.

[0023] 3. Pure water is used inside the multiple heat exchange pipelines of the main circulation loop. When the heat exchanger is damaged, it will not affect the operation of the main circulation loop, which can meet the safety requirements of the internal cooling water system.

[0024] 4. The present invention considers setting a capillary network system at the end of rooms such as offices, and makes full use of low-quality heat energy of about 35°C for heating to improve the comfort of office rooms. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 - Schematic diagram of the system structure of the embodiment of the present invention;

[0026] Figure 2 - Schematic diagram of the main circulation loop structure of the embodiment of the present invention;

[0027] Figure 3 - Schematic diagram of the seawater cooling system and the fresh water cooling system of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] To further understand the content, features and effects of the present invention, the following embodiments are given and described in detail in conjunction with the attached Figures 1 to 3 drawings.

[0029] As Figures 1 to 2As shown in the figure, this embodiment discloses a waste heat energy recovery system for a converter valve based on heat pipe technology, which includes a main circulation loop, a capillary network heat recovery system, a fresh air heat recovery system, and a seawater cooling system; the main circulation loop includes an internal cooling main circulation water pump connected to the outlet of the converter valve bridge arm, a first heat exchange pipeline, a second heat exchange pipeline, and a third heat exchange pipeline that are sequentially connected in series to the outlet end of the internal cooling main circulation water pump, and the other end of the third heat exchange pipeline is connected to the converter valve bridge arm inlet; the first heat exchange pipeline includes a main path of the first heat exchange pipeline and a branch of the first heat exchange pipeline, and the branch of the first heat exchange pipeline exchanges heat with the fresh air heat recovery system through a water-air heat pipe heat exchanger; the second heat exchange pipeline includes a main path of the second heat exchange pipeline and a branch of the second heat exchange pipeline, and the branch of the second heat exchange pipeline exchanges heat with the capillary network heat recovery system through a water-water plate heat exchanger; an internal cooling main circulation water pump is arranged at the outlet of the converter valve bridge arm; the third heat exchange pipeline exchanges heat with the seawater cooling system through a fresh water-internal cooling water plate heat exchanger.

[0030] The present invention utilizes heat pipe technology. When the outdoor temperature at sea is too low in winter, it makes full use of the waste heat of the converter valve, reduces waste, preheats the fresh air system of the room where the combined air conditioning unit is set, and at the same time uses capillaries to supply heat to rooms such as offices. In addition, in this embodiment, pure water is used inside the multiple heat exchange pipelines of the main circulation loop. When the heat exchanger is damaged, it will not affect the operation of the main circulation loop, and the safety requirements of the internal cooling water system can be met.

[0031] In this embodiment, a valve V5 is arranged on the main path of the second heat exchange pipeline, which is an electric butterfly valve, facilitating the maintenance of the branch of the second heat exchange pipeline.

[0032] As Figure 1 shown, the branch of the first heat exchange pipeline exchanges heat with the fresh air heat recovery system through a water-air heat pipe heat exchanger. A three-way regulating valve V1 is arranged at the inlet end of the branch of the first heat exchange pipeline and the junction of the main path and the branch of the first heat exchange pipeline. The three-way regulating valve V1 recovers the waste heat of the converter valve in advance, and at the same time adds a branch of the first heat exchange pipeline, which can recover the waste heat of the converter valve in advance.

[0033] As Figure 1 shown, in this embodiment, a check valve and a first regulating valve V2 are sequentially arranged between the outlet end of the water-air heat pipe heat exchanger and the outlet end of the branch of the first heat exchange pipeline, which is convenient for maintenance, that is, the first regulating valve V2 can be closed for maintenance. The first regulating valve is realized by an electric butterfly valve, and of course, other forms of regulating valves can also be adopted. In addition, a first temperature sensor TT01 and a second temperature sensor TT02 are respectively installed at the inlet end and the outlet end of the branch of the first heat exchange pipeline for detecting the water temperature to ensure the final cooling effect.

[0034] In this embodiment, the fresh air heat recovery system includes a fresh air inlet duct connected to a water-air heat pipe heat exchanger, a combined air handling unit connected to the outlet end of the fresh air inlet duct, a supply air duct connected to the outlet end of the combined air handling unit, and hot air is sent out from the outlet end of the supply air duct for heating the valve hall. The preheated fresh air system is subjected to temperature and humidity treatment by the combined air handling unit and then sent to rooms such as the valve hall through the air duct to meet the room temperature and humidity requirements. In this embodiment, a second regulating valve V3 and a second regulating valve V4 are respectively arranged at the inlet and outlet ends of the second heat exchange pipeline. In this embodiment, the second regulating valve V4 is an electric butterfly valve, which is convenient for overhauling the second heat exchange pipeline.

[0035] As Figure 1 shown, in this embodiment, the capillary network heat recovery system includes a capillary network heat recovery system inlet and an outlet connected to both ends of a water-water plate heat exchanger. The capillary network heat recovery system inlet is connected to a capillary network located in the office. At the outlet of the capillary network, a heat recovery circulating water pump and a filter are connected in sequence. The outlet of the filter is connected to the water-water plate heat exchanger, and a water replenishing mechanism is also arranged on the pipeline at the inlet of the heat recovery circulating water pump.

[0036] As Figure 1 and 2 shown, in this embodiment, a third temperature sensor TT03 and a fourth temperature sensor TT04 are respectively installed at the inlet end and the outlet end of the second heat exchange pipeline branch for detecting the water temperature to ensure the final cooling effect.

[0037] Preferably, the material of the capillary network is PPR plastic. It is like the capillaries in the human body, which has the function of distributing and transporting fluids. At the same time, like the human body, it successfully conducts heat exchange with the surrounding environment to achieve the function of regulating the room temperature. The capillary radiation air-conditioning system only needs 32 - 30 degrees in winter, and fully utilizes the low-quality heat energy of about 35 °C for heating to improve the comfort of office rooms. In the capillary network heat recovery system, after the fresh water absorbs the heat of the water-water heat pipe heat exchanger, the temperature rises. The heated hot water is driven by the heat recovery circulating water pump into the capillary network in the room for comfortable heating of office rooms.

[0038] In this embodiment, as Figure 1 shown, the capillary network heat recovery system is provided with a water replenishing tank, a fresh water replenishing pump and an expansion tank for water replenishing and pressure stabilization. The water replenishing mechanism includes a water replenishing tank located at the outlet of the capillary network, a replenishing pump located at the outlet of the water replenishing tank for regulating the water flow size, and an expansion tank for storing water. The water replenishing mechanism can realize functions such as stabilizing the pressure of the system, automatically replenishing water, automatically exhausting air, automatically draining water and automatically overpressure protection.

[0039] As Figure 1 and 2As shown, in this embodiment, a fifth temperature sensor TT05 and a sixth temperature sensor TT06 are respectively installed at the inlet end and the outlet end of the third heat exchange pipeline for detecting the water temperature to ensure the final cooling effect. The temperature of the water finally flowing back to the converter valve bridge arm is about 25 degrees Celsius.

[0040] As Figure 3 shown, a fresh water cooling system for preventing sea water from entering the third heat exchange pipeline is further provided between the third heat exchange pipeline and the sea water cooling system. The fresh water cooling system is a closed cycle. After the fresh water absorbs the heat of the converter valve, its temperature rises. The heated hot water is driven by a fresh water circulation pump into the sea water-fresh water plate heat exchanger, where it exchanges heat with the sea water in a non-contact manner. The cooled fresh water returns to the fresh water-inner cooling water plate heat exchanger to cool the cold water in the valve, and this cycle repeats. At the same time, a makeup water tank and a fresh water makeup pump are provided in the fresh water cooling system for water replenishment, and a fresh water filter is provided to treat the water. The sea water cooling system is an open cycle. After the sea water is lifted by a sea water lift pump, it passes through an anti-marine organism device and a sea water filter, and then passes through the sea water-fresh water plate heat exchanger. After absorbing the heat of the sea water-fresh water heat exchanger, its temperature rises, and the heated sea water is discharged into the sea water, and this cycle repeats.

[0041] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A waste heat energy recovery system for a converter valve based on heat pipe technology, characterized in that, The system includes a main circulation loop, a capillary network heat recovery system, a fresh air heat recovery system, and a seawater cooling system; The main circulation loop includes an internal cooling main circulation water pump connected to the outlet of the converter valve bridge arm, a first heat exchange pipeline, a second heat exchange pipeline, and a third heat exchange pipeline serially arranged in sequence at the outlet end of the internal cooling main circulation water pump, and the other end of the third heat exchange pipeline is connected to the converter valve bridge arm inlet; The first heat exchange pipeline includes a main path of the first heat exchange pipeline and a branch of the first heat exchange pipeline, and the branch of the first heat exchange pipeline exchanges heat with the fresh air heat recovery system through a water-air type heat pipe heat exchanger; The second heat exchange pipeline includes a main path of the second heat exchange pipeline and a branch of the second heat exchange pipeline, and the branch of the second heat exchange pipeline exchanges heat with the capillary network heat recovery system through a water-water type plate heat exchanger; An internal cooling main circulation water pump is provided at the outlet of the converter valve bridge arm; The third heat exchange pipeline exchanges heat with the seawater cooling system through a fresh water-internal cooling water plate heat exchanger.

2. The waste heat energy recovery system for a converter valve based on heat pipe technology according to claim 1, wherein: A three-way regulating valve (V1) is provided at the inlet end of the branch of the first heat exchange pipeline, at the junction of the main path of the first heat exchange pipeline and the branch of the first heat exchange pipeline, and a check valve and a first regulating valve (V2) are provided between the outlet end of the water-air type heat pipe heat exchanger and the outlet end of the branch of the first heat exchange pipeline.

3. A waste heat energy recovery system for a converter valve based on heat pipe technology according to claim 2, characterized in that: The check valve is provided on one side close to the outlet end of the water-air type heat pipe heat exchanger, and the first regulating valve (V2) is provided on one side close to the outlet end of the branch of the first heat exchange pipeline.

4. The waste heat energy recovery system for a converter valve based on heat pipe technology according to claim 1, wherein: The fresh air heat recovery system includes a fresh air inlet pipeline connected to the water-air type heat pipe heat exchanger, a combined air handling unit connected to the outlet end of the fresh air inlet pipeline, a supply air duct connected to the outlet end of the combined air handling unit, and hot air is sent out from the outlet end of the supply air duct, and the hot air is used to heat the valve hall.

5. A waste heat energy recovery system for a converter valve based on heat pipe technology according to claim 1, characterized in that: Two second regulating valves (V3, V4) are respectively provided at the inlet and outlet ends of the second heat exchange pipeline.

6. The waste heat energy recovery system for a converter valve based on heat pipe technology according to claim 1, wherein: A valve (V5) for overhauling the branch of the second heat exchange pipeline is provided on the main path of the second heat exchange pipeline.

7. A waste heat energy recovery system for a converter valve based on heat pipe technology according to claim 1, characterized in that: The capillary network heat recovery system includes a capillary network heat recovery system inlet and an outlet respectively connected to both ends of the water-water type plate heat exchanger, a capillary network is connected to the capillary network heat recovery system inlet, a heat recovery circulation water pump and a filter are sequentially connected at the outlet of the capillary network, the outlet of the filter is connected to the water-water type plate heat exchanger, and a water replenishing mechanism is further provided on the pipeline at the inlet of the heat recovery circulation water pump.

8. The waste heat energy recovery system of a converter valve based on heat pipe technology according to claim 7, characterized in that: The water replenishing mechanism includes a water replenishing tank located at the outlet of the capillary network, a water replenishing pump located at the outlet of the water replenishing tank for regulating the water flow size, and an expansion tank for storing water.

9. The waste heat energy recovery system for a converter valve based on heat pipe technology according to claim 7, characterized in that: The material of the capillary network is PPR plastic.

10. A waste heat energy recovery system for a converter valve based on heat pipe technology according to claim 1, characterized in that, A fresh water cooling system for preventing seawater from entering the third heat exchange pipeline is further provided between the third heat exchange pipeline and the seawater cooling system.

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