Efficient energy-saving intelligent cold and heat source system for coastal high-salt environment

Abstract

The utility model provides an efficient energy-saving intelligent cold and heat source system for a coastal high-salt environment, which relates to the field of heat exchange, and comprises a heat exchange circulating pipeline and a water replenishing tank, a cold and hot water circulating water pump for pressurization is connected in series inside the heat exchange circulating pipeline, and the cold and hot water circulating water pump is connected in series inside the water replenishing tank. The cold and hot water circulating water pump is connected with a seawater source heat pump type screw type cold and hot water unit in series, and the seawater source heat pump type screw type cold and hot water unit is further connected with an air cooled heat pump type screw type cold and hot water unit in parallel. The seawater source heat pump type screw water chiller-heater unit arranged on the main path normally exchanges heat, and when one or more of the seawater source heat pump type screw water chiller-heater unit goes wrong, the air cooled heat pump type screw water chiller-heater unit can be switched to work, so that the running stability of the device can be ensured.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange technology, specifically a high-efficiency and energy-saving intelligent cold and heat source system for coastal high-salt environments. Background Technology

[0002] In coal-fired power generation projects, the cold and heat source system is the core facility ensuring air conditioning and ventilation in the main plant and the surrounding area. Traditional systems have the following problems: First, insufficient energy efficiency; poor part-load performance of chillers, low pump operating efficiency, and lack of dynamic adjustment logic lead to high overall energy consumption. Second, the lack of automatic switching mechanisms in case of system failure results in high maintenance costs. Third, the control is rudimentary; traditional control systems only implement start-stop functions and cannot optimize unit combinations and pump frequencies according to load changes, making it difficult to meet energy-saving and stable operation requirements. Finally, the severe salt spray corrosion in the coastal environment makes conventional materials prone to rust, affecting equipment lifespan. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a high-efficiency, energy-saving intelligent cold and heat source system for coastal high-salt environments, solving the problems of high energy consumption and instability mentioned in the background technology.

[0004] Technical solution

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a high-efficiency and energy-saving intelligent cold and heat source system for coastal high-salt environments, including a heat exchange circulation pipeline and a water supply tank. The water supply tank is connected to and penetrates a vacuum exhaust water supply and pressure stabilization device. The output end of the vacuum exhaust water supply and pressure stabilization device is connected to the heat exchange circulation pipeline. A pressurized hot and cold water circulation pump is connected in series inside the heat exchange circulation pipeline. A seawater source heat pump type screw chiller is connected in series with the hot and cold water circulation pump. In addition to the seawater source heat pump type screw chiller, an air-cooled heat pump type screw chiller is also connected in parallel. The air-cooled heat pump type screw chiller is also connected in series with a cooling water pump. Both the air-cooled heat pump type screw chiller and the seawater source heat pump type screw chiller are equipped with a semi-hermetic screw variable frequency compressor with stepless load adjustment.

[0006] Furthermore, both the hot and cold water circulating pumps and the cooling water pumps are controlled by electric butterfly valves interlocked with the unit's operating status. The system also includes a control room for installing the control system. The control room consists of a PLC controller, a touch screen, and a photoelectric switch, as well as an energy efficiency monitoring module for collecting energy consumption information. The touch screen controls the PLC controller output, and the photoelectric switch enables photoelectric signal conversion between the PLC controller, the electric butterfly valves, and the semi-hermetic screw variable frequency compressor. The hot and cold water circulating pumps and the cooling water pumps are variable frequency pumps controlled by a frequency converter. The signal acquisition end of the frequency converter includes Honeywell sensors for detecting return water temperature and pressure differences.

[0007] Furthermore, the seawater source heat pump type screw chiller unit includes a flooded evaporator and a shell and tube condenser, and its internal pipes are all made of titanium.

[0008] Furthermore, the air-cooled heat pump type screw chiller unit includes a finned tube condenser and a low-noise axial flow fan. The air-cooled heat pump type screw chiller unit uses copper tubes, and the tube sheet and shell are coated with anti-corrosion coating. The flange interface is made of stainless steel, and the air inlet end of the low-noise axial flow fan is equipped with a metal protective mesh.

[0009] Furthermore, both the seawater source heat pump type screw chiller and the air-cooled heat pump type screw chiller adopt a dual refrigeration circuit design, with each circuit independently equipped with an electronic expansion valve, pressure sensor, and temperature sensor.

[0010] Furthermore, fully automatic electric brush stainless steel filters are installed at the inlet and outlet ends of the heat exchange circulation pipeline, and the processing capacity of the fully automatic electric brush stainless steel filter 7 is 5% of the total system flow.

[0011] Furthermore, the vacuum exhaust water replenishment and pressure stabilization device uses an atmospheric pressure diaphragm tank and a water replenishment pump, with the water replenishment pump drawing water from the water replenishment tank.

[0012] The beneficial effects of this utility model are as follows:

[0013] 1. This high-efficiency, energy-saving, intelligent cold and heat source system for coastal high-salt environments uses a seawater source heat pump type screw chiller unit on the main line for normal heat exchange. When one or more of the seawater source heat pump type screw chiller units malfunction, the system can switch to an air-cooled heat pump type screw chiller unit, thereby ensuring the stability of the system's operation.

[0014] 2. This high-efficiency, energy-saving, intelligent cold and heat source system for coastal high-salt environments can automatically increase the frequency of the cooling water system according to the water temperature. In conjunction with the semi-hermetic screw inverter compressor with stepless load adjustment, it can automatically adjust the operating conditions of the device according to the actual use environment, thereby achieving energy saving.

[0015] 3. This high-efficiency, energy-saving, intelligent cold and heat source system for coastal high-salt environments includes a seawater source heat pump type screw chiller unit comprising a flooded evaporator and a shell-and-tube condenser, with all internal pipes made of titanium. The air-cooled heat pump type screw chiller unit comprises a finned tube condenser and a low-noise axial flow fan, using copper tubes. The tube sheet and shell are coated with an anti-corrosion coating, and the flange interfaces are made of stainless steel, thus achieving corrosion resistance of the device.

[0016] 4. This high-efficiency, energy-saving, intelligent cold and heat source system for coastal high-salt environments uses fully automatic electric brush stainless steel filters installed at the inlet and outlet ends of the heat exchange circulation pipeline. The fully automatic electric brush stainless steel filters are DN200 with a filtration accuracy of 50 mesh. The processing capacity of the fully automatic electric brush stainless steel filters is % of the total system flow, which can ensure pipeline cleanliness and further improve energy efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall architecture of the present invention;

[0018] Figure 2 This is a logic block diagram of the intelligent control system for the computer room of the present invention;

[0019] Figure 3 This is a schematic diagram of the internal structure of the seawater source heat pump unit of the present invention;

[0020] Figure 4 This is a schematic diagram of the external structure of the air-cooled heat pump unit of the present invention.

[0021] The components include: 1. Seawater source heat pump type screw chiller / water chiller; 2. Air-cooled heat pump type screw chiller / water chiller; 3. Hot and cold water circulating pump; 4. Cooling water pump; 5. Vacuum exhaust water replenishment and pressure stabilization device; 6. Water replenishment tank; 7. Fully automatic electric brush type stainless steel filter; 8. Touch screen; 9. Photoelectric switch; 10. Energy efficiency monitoring module; 11. Frequency converter; 12. Honeywell sensor; 13. Flooded evaporator; 14. Shell and tube condenser; 15. Semi-hermetic screw frequency converter; 16. Finned tube condenser; 17. Low-noise axial flow fan; 18. Metal protective mesh. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] See Figure 1-4 A high-efficiency, energy-saving intelligent cold and heat source system for high-salinity coastal environments is disclosed. It includes heat exchange circulation pipes, with optimized water-side flow velocity to 0.9-1.8 m / s. The pipes are made of Q235B carbon steel with an anti-corrosion coating on the seawater contact section. The main pipe is DN250, and the branch pipes are DN200. BIM optimization reduces elbows by 20%. It also includes a 10.4 m³ / h water supply tank (made of stainless steel). 3The system is equipped with a magnetic level gauge to support automatic water replenishment control. A vacuum exhaust water replenishment and pressure stabilization device 5 is connected to and runs through the water replenishment tank 6. The vacuum exhaust water replenishment and pressure stabilization device 5 uses an atmospheric pressure diaphragm tank and a water replenishment pump, which draws water from the water replenishment tank 6. Two water replenishment pumps are used, one in operation and one on standby. The water replenishment pump has a flow rate of 16 t / h and a head of 30 m. The output end of the vacuum exhaust water replenishment and pressure stabilization device 5 is connected to a heat exchange circulation pipeline. Six hot and cold water circulation pumps 3 are connected in series inside the heat exchange circulation pipeline, with a flow rate of 260 m³ / h each. 3 / h, head 43m, hot and cold water circulating pump 3 is connected in series with seawater source heat pump type screw chiller unit 1, using four TWSPV0304.2AW1S type, with a cooling capacity of about 1070kW. The evaporator and condenser use high corrosion resistant titanium pipes with a diameter ≥19.05mm and a wall thickness ≥1.2mm. In addition to the seawater source heat pump type screw chiller unit 1, there is also an air-cooled heat pump type screw chiller unit 2 connected in parallel. The air-cooled heat pump type screw chiller unit 2 has one TASF310.2AH1 type and is connected in series with cooling water pump 4. Both the air-cooled heat pump type screw chiller unit 2 and the seawater source heat pump type screw chiller unit 1 are equipped with a semi-hermetic screw variable frequency compressor 15 with stepless load adjustment.

[0024] Both the hot and cold water circulating pump 3 and the cooling water pump 4 are controlled by DN200 electric butterfly valves interlocked with the unit's operating status. The system also includes a control room for installing the control system. The control room consists of a PLC controller (Siemens S7-1513 PLC), a 15-inch Kunlun Tongtai touch screen 8, and a photoelectric switch 9, as well as an energy efficiency monitoring module 10 for collecting energy consumption information. The touch screen 8 is used to control the PLC controller output. The photoelectric switch 9 realizes the photoelectric signal conversion between the PLC controller, the electric butterfly valve, and the semi-hermetic screw variable frequency compressor 15. The hot and cold water circulating pump 3 and the cooling water pump 4 are variable frequency pumps and are controlled by a frequency converter 11. The signal acquisition end of the frequency converter 11 includes Honeywell sensors 12 such as Rosemount electromagnetic flow meters and temperature sensors for detecting return water temperature difference and pressure difference, as well as pressure gauges. The cooling water system adjusts the frequency according to the water temperature. It automatically adds units when the unit load is ≥80% and reduces units when it is ≤30%. It supports the ModBus TCP protocol to interface with the power plant's DCS, with data refresh ≤1 second and fault switching ≤30 seconds.

[0025] The seawater source heat pump type screw chiller unit 1 includes a flooded evaporator 13 and a shell and tube condenser 14, and its internal pipes are all made of titanium.

[0026] The air-cooled heat pump type screw chiller unit 2 includes a finned tube condenser 16 and a low-noise axial flow fan 17. The air-cooled heat pump type screw chiller unit 2 uses copper tubes, and the tube sheet and shell are coated with anti-corrosion coating. The flange interface is made of stainless steel. The air inlet end of the low-noise axial flow fan 17 is equipped with a metal protective mesh 18.

[0027] Both the seawater source heat pump type screw chiller unit 1 and the air-cooled heat pump type screw chiller unit 2 adopt a dual refrigeration circuit design. Each circuit is independently equipped with an electronic expansion valve, pressure sensor and temperature sensor to support single-circuit fault isolation without affecting the operation of the other circuit.

[0028] The inlet and outlet ends of the heat exchange circulation pipeline are equipped with fully automatic electric brush stainless steel filters 7. The fully automatic electric brush stainless steel filters 7 are DN200 with a filtration accuracy of 50 mesh. The processing capacity of the fully automatic electric brush stainless steel filters 7 is 5% of the total system flow.

[0029] Seawater contact components are made of titanium tubing and duplex stainless steel 022Cr22Ni5Mo3N. Non-contact components are made of carbon steel brackets 22, which are sandblasted for corrosion protection. The total coating thickness is ≥220μm. The air-cooled unit casing has a salt spray test of ≥1000 hours. The unit is fixed with chemical anchors, and the pipeline is equipped with seismic supports and hangers, which can withstand a seismic force of 0.15g. The compressor vibration is ≤25μm and the fan vibration is ≤30μm. During single-unit trial operation, the vibration is ≤30μm and the bearing temperature rise is ≤40K. The system commissioning load response is ≤5 minutes. The SCOP of the third-party testing room is ≥5.0.

[0030] In use, the seawater source heat pump type screw chiller unit 1 on the main line is set to exchange heat normally. When one or more of the seawater source heat pump type screw chiller units 1 have a problem, the air-cooled heat pump type screw chiller unit 2 can be switched to work, thereby ensuring the stability of the device operation. The operating conditions of the unit can be controlled by monitoring the return water temperature difference and pressure difference, thereby achieving the effect of reducing energy consumption.

[0031] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A high-efficiency, energy-saving intelligent cold and heat source system for coastal high-salinity environments, comprising heat exchange circulation pipes and a water supply tank (6), characterized in that: The water supply tank (6) is connected to and penetrates a vacuum exhaust water supply and pressure stabilization device (5). The output end of the vacuum exhaust water supply and pressure stabilization device (5) is connected to a heat exchange circulation pipe. A hot and cold water circulation pump (3) for pressurization is connected in series inside the heat exchange circulation pipe. A seawater source heat pump type screw chiller unit (1) is connected in series with the hot and cold water circulation pump (3). A wind-cooled heat pump type screw chiller unit (2) is also connected in parallel with the seawater source heat pump type screw chiller unit (1). A cooling water pump (4) is also connected in series with the wind-cooled heat pump type screw chiller unit (2) and the seawater source heat pump type screw chiller unit (1). Both the wind-cooled heat pump type screw chiller unit (2) and the seawater source heat pump type screw chiller unit (1) are equipped with a semi-enclosed screw variable frequency compressor (15) with stepless load regulation.

2. The high-efficiency energy-saving intelligent cold and heat source system for coastal high-salinity environments according to claim 1, characterized in that: The hot and cold water circulating pump (3) and the cooling water pump (4) are both controlled by electric butterfly valves that are interlocked with the unit's operating status. The system also includes a control room for installing the control system. The control room consists of a PLC controller, a touch screen (8) and a photoelectric switch (9), as well as an energy efficiency monitoring module (10) for collecting energy consumption information of the collection device. The touch screen (8) is used to control the output of the PLC controller. The photoelectric switch (9) realizes the photoelectric signal conversion between the PLC controller, the electric butterfly valve and the semi-hermetic screw frequency converter (15). The hot and cold water circulating pump (3) and the cooling water pump (4) are variable frequency pumps and are controlled by a frequency converter (11). The signal acquisition terminal of the frequency converter (11) includes a Honeywell sensor (12) for detecting the return water temperature difference and pressure difference.

3. The high-efficiency energy-saving intelligent cold and heat source system for coastal high-salinity environments according to claim 2, characterized in that: The seawater source heat pump type screw chiller (1) includes a flooded evaporator (13) and a shell and tube condenser (14), and the internal pipes are all made of titanium.

4. The high-efficiency energy-saving intelligent cold and heat source system for coastal high-salinity environments according to claim 2, characterized in that: The air-cooled heat pump type screw chiller (2) includes a finned tube condenser (16) and a low-noise axial flow fan (17). The air-cooled heat pump type screw chiller (2) uses copper tubes, and the tube sheet and shell are coated with anti-corrosion coating. The flange interface is made of stainless steel. The air inlet end of the low-noise axial flow fan (17) is equipped with a metal protective net (18).

5. A high-efficiency, energy-saving intelligent cold and heat source system for coastal high-salinity environments according to claim 3 or 4, characterized in that: Both the seawater source heat pump type screw chiller (1) and the air-cooled heat pump type screw chiller (2) adopt a dual refrigeration circuit design, with each circuit independently equipped with an electronic expansion valve, pressure sensor and temperature sensor.

6. A high-efficiency, energy-saving intelligent cold and heat source system for coastal high-salinity environments according to claim 5, characterized in that: The inlet and outlet ends of the heat exchange circulation pipeline are equipped with fully automatic electric brush stainless steel filters (7), and the processing capacity of the fully automatic electric brush stainless steel filters (7) is 5% of the total system flow.

7. A high-efficiency, energy-saving intelligent cold and heat source system for coastal high-salinity environments according to claim 6, characterized in that: The vacuum exhaust water replenishment and pressure stabilization device (5) uses an atmospheric pressure diaphragm tank and a water replenishment pump, which draws water from the water replenishment tank (6).

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