Semi-open high-temperature heat pump system and working method thereof

Patent metadata

Field	Value
Publication number	US-2022042717-A1
Application number	US-202017427318-A
Country	US
Kind code	A1
Filing date	Dec 24, 2020
Priority date	Mar 17, 2020
Publication date	Feb 10, 2022
Grant date	—

Abstract

A semi-open high-temperature heat pump system including a compressor, a direct-contact condenser, a heat exchanger, an evaporator, a water purifier, a cold water pump, a hot water pump, a circulating water pump, and a vacuum pump. A discharge port of the compressor is connected to the direct-contact condenser, the direct-contact condenser is connected to the evaporator via the heat exchanger, and the evaporator is connected to a gas suction port of the compressor via a gas vent on its top. An outlet of the water purifier is separately connected to the compressor, the direct-contact condenser, and the evaporator via the cold water pump. An outlet at the bottom of the evaporator is connected to the direct-contact condenser via the circulating water pump. The vacuum pump is connected above the direct-contact condenser, and the hot water pump is connected below the direct-contact condenser.

First claim

1 - 10 . (canceled)

11 . A semi-open high-temperature heat pump system, comprising: a compressor, a direct-contact condenser, a heat exchanger, an evaporator, a water purifier, a cold water pump, and a hot water pump, wherein a filter screen, a spray pipe, a packing, a steam pipe, and an electric heater are successively disposed from top to bottom in the direct-contact condenser; a twelfth valve and a vacuum pump are sequentially connected at the top of the direct-contact condenser via a pipe; an outlet a of the compressor is sequentially connected to a first valve and an inlet b of the steam pipe of the direct-contact condenser via a pipe; an outlet c at the bottom of the direct-contact condenser is sequentially connected to a second valve, the hot water pump, and a first one-way valve via a pipe to realize output to the outside; an outlet d at the bottom of the direct-contact condenser is connected to a third valve and then to an inlet e of the heat exchanger via a pipe; an outlet f of the heat exchanger is sequentially connected to a fourth valve and a first throttle valve and then to an inlet g of the evaporator via a pipe; and a steam outlet i on the top of the evaporator is connected to a sixth valve and then to an inlet j of the compressor via a pipe;
an outlet of the water purifier is sequentially connected to a seventh valve, the cold water pump, and a second one-way valve via a pipe, and is then branched into three paths, wherein one path passes through an eighth valve, a third one-way valve, and a first control valve, and is then connected to a water jet orifice k of the compressor; another path passes through a ninth valve and a fourth one-way valve and is connected to an inlet m of the heat exchanger; and an outlet n of the heat exchanger is connected to an inlet o of the spray pipe of the direct-contact condenser through a second control valve and a tenth valve; and the third path passes through an eleventh valve, a fifth one-way valve, and a second throttle valve, and is connected to an inlet p on the top of the evaporator; and an outlet q at the bottom of the evaporator is sequentially connected to a thirteenth valve, a circulating water pump, and a sixth one-way valve and then to the inlet b of the steam pipe of the direct-contact condenser via a pipe; and a right end is connected to an inlet r of the evaporator via a driving thermal source pipe successively through a filter and a fourteenth valve; and an outlet s of the evaporator outputs a driving thermal source through a fifteenth valve.

12 . The semi-open high-temperature heat pump system according to claim 11 , wherein a safety valve and a non-condensable gas vent control valve are disposed on the top of the direct-contact condenser.

13 . The semi-open high-temperature heat pump system according to claim 11 , wherein a fifth valve and a capillary tube are successively disposed between the outlet f of the heat exchanger and an inlet h of the evaporator via a pipe.

14 . The semi-open high-temperature heat pump system according to claim 11 , wherein the evaporator is a shell-and-tube flooded evaporator in which circulating working water of the system flows through a shell side; and the heat exchanger is a plate heat exchanger or a tube-fin heat exchanger.

15 . The semi-open high-temperature heat pump system according to claim 11 , wherein the first valve to the fifteenth valve are all solenoid valves, plunger type globe valves, or gate valves.

16 . A working method of a semi-open high-temperature heat pump system, comprising:
1) system evacuation and filling process simultaneously opening a first valve, a third valve, a fourth valve, a sixth valve, and a twelfth valve, and turning on a vacuum pump to evacuate the system to a negative pressure therein; and when the pressure in a direct-contact condenser meets the requirement, turning off the vacuum pump and closing the twelfth valve, to maintain a stable internal pressure of the system; and turning on a cold water pump, and opening a seventh valve and an eleventh valve, so that circulating working water treated by a water purifier flows through the seventh valve and the eleventh valve, then is throttled and depressurized by a second throttle valve, and is finally charged to an evaporator from an inlet p on the top of the evaporator; and turning off the cold water pump and closing the seventh valve and the eleventh valve when the circulating working fluid is sufficient, thus completing filling the system with the circulating working fluid; 2) system startup and normal operation after completion of system evacuation and filling, opening a fourteenth valve and a fifteenth valve, so that industrial waste heat passes through a filter and the fourteenth valve and enters the evaporator from an inlet r of the evaporator, and is discharged through the fifteenth valve from an outlet s of the evaporator after heat exchange with the circulating working fluid; turning on a compressor, so that water vapor flows from an outlet i on the top of the evaporator, passes through the sixth valve, and enters the compressor from a gas suction port j of the compressor to be compressed; discharging the compressed water vapor from a gas vent a of the compressor, which then passes through the first valve, enters the direct-contact condenser from an inlet b of the steam pipe, and is ejected into the direct-contact condenser via gas vents at the two sides of the steam pipe; after the pressure in the direct-contact condenser reaches a required value, turning on the cold water pump and a hot water pump, and opening a second valve, a seventh valve, an eighth valve, a ninth valve, and a tenth valve; after the working water treated by the water purifier passes through the seventh valve and the cold water pump, ejecting part of the water into the compressor from a water jet orifice k of the compressor through the eighth valve and a first control valve; another part of the water entering a heat exchanger from an inlet m of the heat exchanger through the ninth valve and then flowing out from an outlet n of the heat exchanger; then ejecting this part of water from an inlet o of the spray pipe into the direct-contact condenser through a second control valve and the tenth valve to conduct contact heat-mass exchange with the high-temperature water vapor discharged from the steam pipe, to finally form high-temperature water; part of the high-temperature water in the direct-contact condenser providing heat to a user through the second valve and the hot water pump via an outlet c at the bottom of the direct-contact condenser; and discharging another part of the high-temperature water from an outlet d at the bottom of the direct-contact condenser, which then passes through the third valve, the heat exchanger, and the fourth valve, is throttled and depressurized by a first throttle valve, and finally enters the evaporator from an inlet g on the top of the evaporator, to realize circulation; 3) system shutdown turning off the compressor; closing the first valve, the third valve, the fourth valve, the sixth valve, the eighth valve, the fourteenth valve, and the fifteenth valve, so that the working fluid does not circulate in the system, and a low-temperature thermal source is no longer provided; the cold water pump and the hot water pump continuously working and absorbing the waste heat in the direct-contact condenser; and after the temperature in the direct-contact condenser is reduced to a required temperature, turning off the cold water pump and the hot water pump, and closing the second valve, the seventh valve, the ninth valve, and the tenth valve, so that the system stops operation; and 4) system freeze prevention when the system shuts down and the ambient temperature is too low, turning on an electric heater in the direct-co

Assignees

• Univ Jiangsu Science & Tech

Inventors

• Shen Jiubing
• Li Zhichao
• Chen Yuping
• Yan Siyuan
• Xu Jinjin

Classifications

• Y02P80/15

  On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply · CPC title

• F25B39/04

  Condensers · CPC title

• F25B2400/13

  Economisers · CPC title

• F25B41/22

  between evaporator and compressor · CPC title

• F25B25/005

  using primary and secondary systems · CPC title