CN-119660854-B - Tube-box type integrated heat pump seawater desalination system and working method thereof

CN119660854BCN 119660854 BCN119660854 BCN 119660854BCN-119660854-B

Abstract

The invention discloses a tube-box type integrated heat pump seawater desalination system and a working method thereof, belonging to the field of seawater desalination and energy power. The system mainly comprises a pipe box, a water pump, a water inlet valve, a gas distributor, an air inlet valve, a fan, a drain valve and a heat pump subsystem, wherein the pipe box also comprises a water storage tank, a water collection tank, a bent pipe, a ventilation pipe, a water collection pipe and an air outlet, the heat pump subsystem comprises a condenser, an expansion valve, a compressor and an evaporator, the condenser is arranged in the water storage tank, and the evaporator is arranged in the water collection pipe and is positioned above the water collection tank. According to the invention, the condenser of the heat pump system is arranged in the water storage tank of the pipe box, the evaporator of the heat pump system is arranged in the water collecting pipe of the pipe box, and the water storage tank of the original humidifying and dehumidifying sea water desalination system is integrated into the pipe box, so that the pipe box type integrated design of the heat pump humidifying and dehumidifying sea water desalination system is realized, the system energy is high, and the fluid flowing heat loss is small. The system has compact structure, small heat loss and high heat efficiency.

Inventors

CHEN JUNJIE
QIN JIAHAO
WANG XIAOXIAO
ZHANG TIANHUI
ZHANG ZHIHAO
ZHANG FANGFANG
LI GUOPEI
ZHANG JIAYI
ZHONG MINGSHENG

Assignees

郑州轻工业大学

Dates

Publication Date: 20260508
Application Date: 20241107

Claims (2)

1. A tube-box type integrated heat pump seawater desalination system is characterized by mainly comprising a tube box (1), a water pump (4), a water inlet valve (5), a gas distributor (6), an air inlet valve (7), a fan (8), a drain valve (11) and a heat pump subsystem (A); The pipe box (1) comprises a water storage tank (2), a water collecting tank (12), a bent pipe (14), a ventilation pipe (15), a water collecting pipe (16) and an air outlet (17), wherein the pipe box (1) adopts an integrated structure and is distributed in a right angle shape, the water collecting tank (12) consists of a groove on the lower wall of the water collecting pipe (16) and is positioned at the lower edge of the water collecting pipe (16); The gas distributor (6) is fixed at the bottom of the water storage tank (2); The heat pump subsystem (A) comprises a condenser (3), an expansion valve (9), a compressor (10) and an evaporator (13), wherein the condenser (3) is arranged in the water storage tank (2), and the evaporator (13) is arranged in the water collecting pipe (16) and is positioned above the water collecting tank (12); The outlet of the water pump (4) is connected with the inlet of the water inlet valve (5), and the outlet of the water inlet valve (5) is connected with the water side inlet of the water storage tank (2); The outlet of the fan (8) is connected with the inlet of the air inlet valve (7), the outlet of the air inlet valve (7) is connected with the air side inlet of the water storage tank (2), the air side outlet of the water storage tank (2) is connected with the air distributor (6), the outlet above the water storage tank (2) is communicated with the elbow pipe (14), the elbow pipe (14) is communicated with the ventilation pipe (15), the ventilation pipe (15) is communicated with the water collecting pipe (16), the water collecting pipe (16) is communicated with the air outlet (17), and the air outlet (17) is communicated with the atmosphere; The outlet of the water collecting tank (12) is connected with the inlet of the water discharging valve (11), and the outlet of the water discharging valve (11) is communicated with the atmosphere; the heat pump subsystem (A) is connected by internal circulation, the outlet of the condenser (3) is connected with the inlet of the expansion valve (9), the outlet of the expansion valve (9) is connected with the inlet of the evaporator (13), the outlet of the evaporator (13) is connected with the inlet of the compressor (10), and the outlet of the compressor (10) is connected with the inlet of the condenser (3); The height H1 of the water storage tank (2), the liquid level H2 of the water storage tank (2) and the pipe distribution height H3 of the condenser (3) meet the following relations that 0.7H1 is less than H2 is less than 0.85H1 and 0.6H2 is less than or equal to H3 and less than or equal to 0.8H2; seawater is driven by a water pump (4) and enters a bottom water storage tank (2) of a pipe box (1) through a water inlet valve (5), the liquid level H2 in the water storage tank (2) is controlled by the water inlet valve (5), and the height H1 of the water storage tank (2) cannot be higher than 0.85 times, and the height H1 of the water storage tank (2) cannot be lower than 0.7 times; The wet air is sent to an air inlet valve (7) through a fan (8), then enters a gas distributor (6) in a water storage tank (2) from the bottom, is uniformly distributed in sea water, is heated by a condenser (3) from bottom to top, is humidified and then is discharged from an outlet above the water storage tank (2), the high-temperature and high-humidity wet air sequentially flows through an elbow pipe (14) and a ventilation pipe (15) to enter a water collecting pipe (16), is cooled and dehumidified by an evaporator (13) in the water collecting pipe (16), water vapor in the wet air is condensed to obtain fresh water, the fresh water is collected in the water collecting tank (12), and then the wet air is discharged out of the system through an air outlet (17); The refrigerant in the heat pump subsystem (A) circularly flows, the liquid refrigerant exchanges heat with the wet air in the evaporator (13) at first, the liquid refrigerant is evaporated into gaseous refrigerant by absorbing the sensible heat of the wet air in cooling and the condensation latent heat of water vapor, the gaseous refrigerant is discharged from the outlet of the evaporator (13) and then enters the compressor (10) for compression, the liquid refrigerant is heated and pressurized and then enters the condenser (3), the liquid refrigerant is cooled and condensed by the seawater in the water storage tank (2) and then is depressurized by the expansion valve (9), and then enters the evaporator (13) for circular evaporation; fresh water collected in the water collection tank (12) can be discharged by the water discharge valve (11).
2. A tube-box type integrated heat pump seawater desalination system as claimed in claim 1, wherein said condenser (3) and said evaporator (13) are preferably formed by a single-row coil heat exchange tube.

Description

Tube-box type integrated heat pump seawater desalination system and working method thereof Technical Field The invention designs a tube-box type integrated heat pump seawater desalination system and a working method thereof, belonging to the field of seawater desalination and thermodynamic cycle. Background With the rapid development of social economy, the global fresh water crisis is becoming more serious, and the energy utilization is becoming exhausted, so that the reasonable utilization of fresh water and energy becomes one of the difficulties faced by the new century worldwide. Sea water desalination is still one of the most promising schemes for solving the fresh water crisis, and a heat pump circulation system is also a recognized efficient waste heat recovery and utilization technology, and the two schemes are coupled and utilized to become potential schemes for solving the crisis. The patent number CN202110101839.4, the cooling dehumidification type sea water desalination system with heat pump circulation and the working method thereof and the CN201811416715, the air heating type heat pump humidifying dehumidification type sea water desalination system and the working method thereof respectively disclose two possible schemes of heat pump and humidifying dehumidification type sea water desalination coupling development, in the scheme, the heat pump system is coupled with the humidifying dehumidification type sea water desalination system through a double-row pipe condenser or an evaporator, the occupied space of equipment is greatly increased for the original humidifying dehumidification type sea water desalination system, the heat loss of the system is also increased due to the arrangement of a long pipe, and the advantages of how to integrate the heat pump waste heat recovery in a smaller space are the current problems to be solved. Disclosure of Invention The invention provides a compact and high-efficiency tube-box type integrated heat pump sea water desalination system and a working method thereof, aiming at the problems of large occupied space, low heat transfer efficiency and the like of the conventional heat pump humidifying and dehumidifying sea water desalination system. A pipe box type integrated heat pump sea water desalination system is characterized by mainly comprising a pipe box, a water pump, a water inlet valve, a gas distributor, an air inlet valve, a fan, a drain valve and a heat pump subsystem; the pipe box comprises a water storage tank, a water collecting tank, a bent pipe, a ventilation pipe, a water collecting pipe and an air outlet, wherein the pipe box adopts an integrated structure and is distributed in a right angle shape; the gas distributor is fixed at the bottom of the water storage tank; the heat pump subsystem comprises a condenser, an expansion valve, a compressor and an evaporator, wherein the condenser is arranged in the water storage tank; The outlet of the water pump is connected with the inlet of the water inlet valve, the outlet of the water inlet valve is connected with the water side inlet of the water storage tank; The outlet of the fan is connected with the inlet of the air inlet valve, the outlet of the air inlet valve is connected with the air side inlet of the water storage tank, the air side outlet of the water storage tank is connected with the air distributor, the outlet above the water storage tank is communicated with the bent pipe, the bent pipe is communicated with the ventilation pipe, the ventilation pipe is communicated with the water collecting pipe, the water collecting pipe is communicated with the air outlet, and the air outlet is communicated with the atmosphere; the water collecting tank outlet is connected with the inlet of a drain valve, and the drain valve outlet is communicated with the atmosphere; The heat pump subsystem is connected by internal circulation, the condenser outlet is connected with the expansion valve inlet, the expansion valve outlet is connected with the evaporator inlet, the evaporator outlet is connected with the compressor inlet, and the compressor outlet is connected with the condenser inlet. The tube-box type integrated heat pump sea water desalination system is characterized in that a condenser and an evaporator are respectively arranged in sea water and air flow in order to improve heat exchange efficiency and reduce heat loss, so that the condenser and the evaporator are preferably formed by a single-row coil tube type heat exchange tube. The tube box type integrated heat pump seawater desalination system is characterized in that in order to ensure that the humidification and dehumidification seawater desalination process is orderly carried out and seawater and fresh water are not mixed, the height H1 of the water storage tank, the liquid level height H2 of the water storage tank and the height H3 of the condenser tube arrangement meet the following relations that H1 is 0.7H1< H2<0.85H1 and H3 is 0.6H2 to 0