An integrated dry hot rock heat recovery screw heat pump device

Abstract

The present invention provides an integrated hot dry rock heat recovery screw heat pump device, which belongs to the technical field of heating devices. It aims to solve the problem that when the existing integrated hot dry rock heat recovery device is used for heating, the operating power of the entire heating device system cannot be adjusted according to the temperature of the heating user, and the entire heating device system is in a normally open state, which wastes a lot of energy and does not meet the contemporary energy-saving and environmental protection needs; it includes a PLC control box, a refrigerant circulation system, a heating hot water circulation system, a hot dry rock heat exchanger hot water circulation system and a heating energy-saving self-circulation system; the heating energy-saving self-circulation system is used to monitor the temperature of the heating user end of the entire integrated hot dry rock heat recovery heating device system, adjust the operating state of the entire device system in real time, and adjust the start and stop of the device according to actual use needs, so that it is more flexible to use, saves energy for system operation, and is more environmentally friendly and energy-saving.

Description

Technical Field

[0001] The present invention relates to the technical field of heating devices, and specifically to an integrated dry hot rock heat recovery screw heat pump device. Background Art

[0002] With the development of economy and the improvement of people's living standards, energy and environmental issues have become more and more the subject of human concern. Among them, hot dry rock, as a clean energy source buried deep underground, has abundant heat reserves and has received extensive attention recently. When the existing integrated hot dry rock heat recovery device is working, the entire device system is in a continuous working state, and it is unable to adjust the operating power of the entire device system in real time according to the temperature conditions of the heating user end, resulting in a large amount of energy waste, which does not meet the energy-saving and environmental protection characteristics of the current society. Summary of the invention

[0003] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide an integrated dry hot rock heat recovery screw heat pump device, which monitors the temperature of the heating user end of the entire integrated dry hot rock heat recovery heating device system through a heating energy-saving self-circulation system, adjusts the operating status of the entire device system in real time, and adjusts the start and stop of the device according to actual usage needs, making it more flexible to use, saving energy for system operation, and being more environmentally friendly and energy-saving.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] An integrated hot dry rock heat recovery screw heat pump device comprises a PLC control box, a refrigerant circulation system, a heating hot water circulation system, a hot dry rock heat exchanger hot water circulation system and a heating energy-saving self-circulation system, wherein the refrigerant circulation system comprises a screw compressor, a shell and tube condenser and a shell and tube dry evaporator; the heating hot water circulation system comprises a user circulation pump, and is characterized in that the heating energy-saving self-circulation system comprises a hot water reservoir, a cold water reservoir, a reservoir hot water inlet pipe and a reservoir hot water outlet pipe arranged on the hot water reservoir, and a reservoir cold water inlet pipe and a reservoir cold water outlet pipe arranged on the cold water reservoir; the hot water reservoir and the cold water reservoir are connected by a circulation pipe, and an energy-saving circulation pump is arranged on the circulation pipe; the reservoir hot water inlet pipe and the reservoir cold water outlet pipe are connected to one side of the shell and tube condenser; the reservoir hot water outlet pipe and the reservoir cold water inlet pipe are respectively connected to the user circulation pump.

[0006] Preferably, a first energy-saving temperature sensor is provided on the hot water outlet pipe of the water reservoir, and a second energy-saving temperature sensor is provided on the cold water inlet pipe of the water reservoir.

[0007] Preferably, a water pressure sensor and a water replenishment electromagnetic three-way valve are also provided on the cold water inlet pipe of the water reservoir.

[0008] Preferably, a water-blocking solenoid valve is provided on the cold water outlet pipe of the water reservoir.

[0009] Preferably, a heat-insulating layer and a waterproof layer are provided in the hot water storage tank.

[0010] The beneficial effects of the present invention are as follows: the present design monitors the temperature of the heating user end of the entire integrated dry hot rock heat recovery heating device system through the heating energy-saving self-circulation system, adjusts the operating status of the entire device system in real time, and adjusts the start and stop of the device according to actual use needs, making it more flexible to use, saving energy for system operation, and being more environmentally friendly and energy-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 A schematic structural diagram of an integrated dry hot rock heat recovery screw heat pump device provided in an embodiment of the present invention.

[0013] Description of reference numerals:

[0014] Shell and tube condenser 1, screw compressor 2, pressure sensor 3, shell and tube dry evaporator 4, cold water outlet pipe of water reservoir 5, water blocking solenoid valve 51, second energy-saving temperature sensor 52, first energy-saving temperature sensor 53, cold water reservoir 54, hot water reservoir 55, hot water inlet pipe of water reservoir 56, energy-saving circulation pump 57, user circulation pump 6. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] like Figure 1As shown, an integrated hot dry rock heat recovery screw heat pump device includes a PLC control box, a refrigerant circulation system, a heating hot water circulation system, a hot dry rock heat exchanger hot water circulation system and a heating energy-saving self-circulation system; the PLC control box controls the operation of the entire system; the refrigerant circulation system includes a screw compressor 2, a shell and tube condenser 1 and a shell and tube dry evaporator 4; a pressure sensor 3 is connected to the top of the screw compressor 2, and the pressure sensor 3 monitors the pressure of the refrigerant. After calculation by the programmable control box, the pressure sensor 3 automatically controls the electric three-way regulating valve on the hot dry rock heat exchanger hot water pipeline to automatically control the flow of hot water from the hot dry rock heat exchanger; the screw compressor 2 is connected to the top of the shell and tube condenser 1, and the shell and tube The bottom end of the condenser 1 is connected to one end of the electromagnetic valve and electronic expansion valve parallel group; the electromagnetic valve and electronic expansion valve parallel group is composed of two groups of electromagnetic valves and electronic expansion valves connected in series in parallel, and the other end of the electromagnetic valve and electronic expansion valve parallel group is connected to the shell and tube dry evaporator 4; the shell and tube dry evaporator 4 is connected to one end of the screw compressor 2 to form a cycle, and the electronic expansion valve controls the connecting pipe between the screw compressor 2 and the shell and tube dry evaporator 4; the environmentally friendly refrigerant R134A is used in the refrigerant circulation system; the heating hot water circulation system includes a user circulation pump 6, and the heating energy-saving self-circulation system includes a hot water reservoir 55, a cold water reservoir 54, and a reservoir hot water inlet pipe arranged on the hot water reservoir 55 56 and the hot water outlet pipe of the water tank, the cold water inlet pipe of the water tank arranged on the cold water reservoir 54 and the cold water outlet pipe 5 of the water tank; the hot water reservoir 55 and the cold water reservoir 54 are connected through a circulation pipe, and an energy-saving circulation pump 57 is arranged on the circulation pipe; the hot water inlet pipe 56 of the water tank and the cold water outlet pipe 5 of the water tank are connected to one side of the shell and tube condenser; a water-blocking electromagnetic valve 51 is arranged on the cold water outlet pipe of the water tank; the hot water outlet pipe of the water tank and the cold water inlet pipe of the water tank are respectively connected to the user circulation pump 6; a first energy-saving temperature sensor 53 is arranged on the hot water outlet pipe of the water tank, and a second energy-saving temperature sensor 52 is arranged on the cold water inlet pipe of the water tank; a water pressure sensor and a water replenishment electromagnetic tee are also arranged on the cold water inlet pipe of the water tank valve; when the water pressure sensor detects that the water pressure in the pipeline is low, water is replenished through the water replenishment pipe connected to the water replenishment electromagnetic three-way valve; the hot water storage tank 55 is provided with an insulation layer and a waterproof layer; the hot dry rock heat exchanger hot water circulation system includes a hot dry rock heat source circulation pump, a hot dry rock heat exchanger outlet pipe and a hot dry rock heat exchanger inlet pipe, the hot dry rock heat exchanger outlet pipe and the hot dry rock heat exchanger inlet pipe are respectively connected to the shell and tube dry evaporator 4, the hot dry rock heat source circulation pump is arranged on the hot dry rock heat exchanger inlet pipe, and the hot dry rock heat exchanger outlet pipe is provided with an electric three-way regulating valve, the third branch pipe of the electric three-way regulating valve is connected to the hot dry rock heat exchanger inlet pipe, and is located between the hot dry rock heat source circulation pump and the hot dry rock heat exchanger.

[0017] Working principle of the present invention:

[0018] (1) Circulation of environmentally friendly refrigerant R134A: The high-temperature and high-pressure gas refrigerant from the screw compressor 2 enters the shell-and-tube condenser 1, undergoes heat exchange with the heating circulation water in the shell-and-tube condenser 1, becomes a medium-temperature and high-pressure refrigerant liquid, passes through the electronic expansion valve, enters the shell-and-tube dry evaporator 4, undergoes heat exchange with the hot water from the hot dry rock heat exchanger in the shell-and-tube dry evaporator 4, absorbs heat, becomes a low-temperature and low-pressure refrigerant gas, and returns to the screw compressor 2;

[0019] (2) Circulation of heating hot water: After the user releases heat, the heating hot water enters the cold water reservoir 54, returns from the cold water reservoir 54 to the unit shell and tube condenser 1, absorbs heat and heats up in the shell and tube condenser 1, and then is sent to the hot water reservoir 55, and then is sent to the user end from the hot water reservoir 55; when the temperature sensors on the hot water outlet pipe of the reservoir and the cold water inlet pipe of the reservoir detect that the temperature difference of the heating hot water is within the set judgment range, it is judged that the temperature at the user has reached a stable state. At this time, the PLC control box controls the entire refrigerant circulation system and the hot dry rock heat exchanger hot water circulation system to the standby state, reducing the system The power is turned on, the heating energy-saving self-circulation system starts to work, the water-blocking solenoid valve 51 on the cold water outlet pipe 5 of the water tank cuts off the water path, and the energy-saving circulation pump 57 starts to work to send the water in the cold water reservoir 54 to the hot water reservoir 55, and through the user circulation pump 6, the user-end self-circulation of the heating hot water is realized; when the temperature sensors on the hot water outlet pipe of the water tank and the cold water inlet pipe of the water tank detect that the temperature difference of the heating hot water exceeds the set range, the water-blocking solenoid valve 51 is turned on, the energy-saving circulation pump 57 stops working, and the PLC control box controls the entire refrigerant circulation system and the hot dry rock heat exchanger hot water circulation system to work normally.

[0020] (3) The hot water from the hot dry rock heat exchanger returns to the hot dry rock heat exchanger after releasing heat in the shell and tube dry evaporator 4, and returns to the shell and tube dry evaporator 4 after absorbing heat;

[0021] (4) The comprehensive COP value of the dry hot rock heat recovery screw heat pump device reaches above 6 under standard operating conditions, and the peak value reaches above 10.

[0022] The design of the present invention monitors the temperature of the heating user end of the entire integrated dry hot rock heat recovery heating device system through the heating energy-saving self-circulation system, adjusts the operating status of the entire device system in real time, and adjusts the start and stop of the device according to actual usage needs. It is more flexible to use, saves energy for system operation, and is more environmentally friendly and energy-saving.

[0023] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An integrated hot dry rock heat recovery screw heat pump device, comprising a PLC control box, a refrigerant circulation system, a heating hot water circulation system, a hot dry rock heat exchanger hot water circulation system and a heating energy-saving self-circulation system, the refrigerant circulation system comprising a screw compressor, a shell and tube condenser and a shell and tube dry evaporator; the heating hot water circulation system comprises a user circulation pump, characterized in that, The heating energy-saving self-circulation system includes a hot water reservoir, a cold water reservoir, a reservoir hot water inlet pipe and a reservoir hot water outlet pipe arranged on the hot water reservoir, and a reservoir cold water inlet pipe and a reservoir cold water outlet pipe arranged on the cold water reservoir; the hot water reservoir and the cold water reservoir are connected by a circulation pipe, and an energy-saving circulation pump is provided on the circulation pipe; the reservoir hot water inlet pipe and the reservoir cold water outlet pipe are connected to one side of the shell and tube condenser; the reservoir hot water outlet pipe and the reservoir cold water inlet pipe are respectively connected to the user circulation pump; the reservoir hot water outlet pipe is provided with a first energy-saving temperature sensor, the reservoir cold water inlet pipe is provided with a second energy-saving temperature sensor, and the reservoir cold water outlet pipe is provided with a water-blocking solenoid valve.

2. The integrated dry hot rock heat recovery screw heat pump device according to claim 1, characterized in that: The cold water inlet pipe of the water storage tank is also provided with a water pressure sensor and a water replenishment electromagnetic three-way valve.

3. The integrated dry hot rock heat recovery screw heat pump device according to claim 1, characterized in that: A heat-insulating layer and a waterproof layer are arranged in the hot water storage tank.

Images