Heat storage type lithium bromide heat pump unit

Abstract

The invention discloses a heat storage type lithium bromide heat pump unit which is characterized by comprising a solution heat exchanger, a solution heat storage tank, a valve, a first solution pump, a second solution pump, a refrigerant pump, a generator, an absorber, a condenser and an evaporator. Solution circulation in the lithium bromide heat pump unit is reconstructed through the solution heat storage tank, decoupling of flow of a dilute solution and flow of a concentrated solution is achieved, when a high-temperature heat source is excessive compared with a low-temperature heat source, the flow of the concentrated solution in the generator is large, the high-temperature heat source is fully utilized, the redundant concentrated solution is stored in the solution heat storage tank, and when the high-temperature heat source is insufficient compared with the low-temperature heat source, the concentrated solution in the generator is stored in the solution heat storage tank. The concentrated solution stored in the solution heat storage tank flows out and enters the absorber together with the concentrated solution flowing out of the generator, so that the absorption capacity of the absorber is guaranteed, and waste of a low-temperature heat source is avoided. The solution is used as a carrier to achieve the heat storage function, the adaptability of unit operation is improved, and the heat supply efficiency is effectively improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of heat supply, and particularly relates to a heat storage type lithium bromide heat pump unit. BACKGROUND

[0002] The lithium bromide heat pump unit is widely applied in a heat supply system, but in actual application, the high-temperature heat source and the low-temperature heat source are often mismatched, that is, the high-temperature heat source is excessive or the low-temperature heat source is excessive. When the high-temperature heat source is excessive compared with the low-temperature heat source, the heat pump unit cannot be accommodated, and the flow of hot water or steam as the high-temperature heat source needs to be reduced through a valve adjustment, and when the high-temperature heat source is insufficient compared with the low-temperature heat source, the heat pump unit can only recover part of the heat of the low-temperature heat source, thereby causing energy waste. The mismatch of the high-temperature heat source and the low-temperature heat source causes the heat pump unit to need to be frequently adjusted in working conditions, thereby causing energy waste, and in addition, the heat pump unit is prone to crystallization, thereby bringing risks to stable operation of the heat pump unit.

[0003] The application provides a heat storage type lithium bromide heat pump unit, heat storage and heat release are performed through a solution, so that the mismatch of the high-temperature heat source and the low-temperature heat source in the application process of the heat pump unit is solved, and the heat supply performance of the heat pump unit is improved. SUMMARY

[0004] (I) Objectives The application aims to provide a heat storage type lithium bromide heat pump unit capable of solving the mismatch of the high-temperature heat source and the low-temperature heat source.

[0005] (II) Technical solutions To solve the above problems, the application provides a heat storage type lithium bromide heat pump unit, which comprises a solution heat exchanger, a solution heat storage tank, a valve, a first solution pump, a second solution pump, a refrigerant pump, a generator, an absorber, a condenser and an evaporator.

[0006] The solution heat exchanger comprises a solution heat exchanger concentrated solution inlet, a solution heat exchanger concentrated solution outlet, a solution heat exchanger dilute solution inlet and a solution heat exchanger dilute solution outlet. The solution heat storage tank comprises a solution heat storage tank concentrated solution inlet, a solution heat storage tank dilute solution outlet, a solution heat storage tank dilute solution inlet and a solution heat storage tank concentrated solution outlet. The generator comprises a generator heat source inlet, a generator heat source outlet, a generator solution inlet and a generator solution outlet. The condenser comprises a condenser heat source inlet, a condenser heat source outlet and a condenser refrigerant outlet. The absorber comprises an absorber heat source inlet, an absorber heat source outlet, an absorber solution inlet and an absorber solution outlet. The evaporator comprises an evaporator heat source inlet, an evaporator heat source outlet, an evaporator refrigerant first inlet, an evaporator refrigerant outlet and an evaporator refrigerant second inlet.

[0007] The high-temperature heat source inlet is communicated with the generator heat source inlet, and the high-temperature heat source outlet is communicated with the generator heat source outlet; the medium-temperature heat source inlet is communicated with the absorber heat source inlet, the absorber heat source outlet is communicated with the condenser heat source inlet, and the condenser heat source outlet is communicated with the medium-temperature heat source outlet; and the low-temperature heat source inlet is communicated with the evaporator heat source inlet, and the evaporator heat source outlet is communicated with the low-temperature heat source outlet.

[0008] The generator solution outlet is communicated with the solution heat storage tank concentrated solution inlet, the solution heat storage tank concentrated solution outlet is communicated with the solution heat exchanger concentrated solution inlet, the solution heat exchanger concentrated solution outlet is communicated with the absorber solution inlet, the absorber solution outlet is communicated with the solution heat exchanger dilute solution inlet through the second solution pump, and the solution heat exchanger dilute solution outlet is communicated with the generator solution inlet.

[0009] The solution heat storage tank dilute solution outlet is communicated with the solution heat exchanger dilute solution inlet through the first solution pump, and the solution heat storage tank dilute solution inlet is communicated with the solution heat exchanger dilute solution inlet through the valve.

[0010] The condenser refrigerant outlet is communicated with the evaporator refrigerant first inlet, and the evaporator refrigerant outlet is communicated with the evaporator refrigerant second inlet through the refrigerant pump.

[0011] Further, the high-temperature heat source inlet is communicated with the generator heat source inlet, and the high-temperature heat source outlet is communicated with the generator heat source outlet; the medium-temperature heat source inlet is communicated with the absorber heat source inlet, the absorber heat source outlet is communicated with the condenser heat source inlet, and the condenser heat source outlet is communicated with the medium-temperature heat source outlet; and the low-temperature heat source inlet is communicated with the evaporator heat source inlet, and the evaporator heat source outlet is communicated with the low-temperature heat source outlet.

[0012] The generator solution outlet is communicated with the solution heat exchanger concentrated solution inlet, the solution heat exchanger concentrated solution outlet is communicated with the solution heat storage tank concentrated solution inlet, the solution heat storage tank concentrated solution outlet is communicated with the absorber solution inlet, the absorber solution outlet is communicated with the solution heat exchanger dilute solution inlet through the second solution pump, and the solution heat exchanger dilute solution outlet is communicated with the generator solution inlet.

[0013] The solution heat storage tank dilute solution outlet is communicated with the solution heat exchanger dilute solution inlet through the first solution pump, and the solution heat storage tank dilute solution inlet is communicated with the solution heat exchanger dilute solution inlet through the valve.

[0014] The condenser refrigerant outlet is communicated with the evaporator refrigerant first inlet, and the evaporator refrigerant outlet is communicated with the evaporator refrigerant second inlet through the refrigerant pump. (Three) beneficial effects The above technical scheme of the present application has the following beneficial technical effects: This invention utilizes a solution heat storage tank to reconstruct the solution circulation of a lithium bromide heat pump unit, decoupling the flow rates of concentrated and dilute solutions. This allows the solution to serve as a carrier for heat storage, improving the adaptability of the unit's operation. It also solves problems such as frequent adjustments and energy waste caused by mismatch between high-temperature and low-temperature heat sources, as well as the risk of crystallization, which may be encountered during the operation of the heat pump unit, effectively improving heating efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0016] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0017] Figure label: 1: Solution heat exchanger; 101: Dilute solution outlet of solution heat exchanger; 102: Dilute solution inlet of solution heat exchanger; 103: Concentrated solution inlet of solution heat exchanger; 104: Concentrated solution outlet of solution heat exchanger; 2: Solution heat storage tank; 201: Concentrated solution inlet of solution heat storage tank; 202: Dilute solution outlet of solution heat storage tank; 203: Dilute solution inlet of solution heat storage tank; 204: Concentrated solution outlet of solution heat storage tank; 3: Valve; 301: Valve inlet; 302: Valve outlet; 4: First solution pump; 401: First solution pump inlet; 402: First solution pump outlet; 5: Second solution pump; 501: Second solution pump inlet; 502: Second solution pump outlet; 6: Refrigerant pump; 601: Refrigerant pump; Refrigerant pump inlet; 602: Refrigerant pump outlet; G: Generator; G01: Generator heat source inlet; G02: Generator heat source outlet; G03: Generator solution inlet; G04: Generator solution outlet; A: Absorber; A01: Absorber heat source inlet; A02: Absorber heat source outlet; A03: Absorber solution inlet; A04: Absorber solution outlet; C: Condenser; C01: Condenser heat source inlet; C02: Condenser heat source outlet; C03: Condenser refrigerant outlet; E: Evaporator; E01: Evaporator heat source inlet; E02: Evaporator heat source outlet; E03: Evaporator first refrigerant inlet; E04: Evaporator refrigerant outlet; E05: Evaporator second refrigerant inlet; Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0019] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0020] like Figure 1 As shown, a thermal storage lithium bromide heat pump unit includes a solution heat exchanger 1, a solution storage tank 2, a valve 3, a first solution pump 4, a second solution pump 5, a refrigerant pump 6, a generator G, an absorber A, a condenser C, and an evaporator E. The solution heat exchanger 1 includes a concentrated solution inlet 103, a concentrated solution outlet 104, a dilute solution inlet 102, and a dilute solution outlet 101. The solution heat storage tank 2 includes a concentrated solution inlet 201, a dilute solution outlet 202, a dilute solution inlet 203, and a concentrated solution outlet 204. The generator G includes a generator heat source inlet G01, a generator heat source outlet G02, a generator solution inlet G03, and a generator solution outlet G04. The condenser C includes a condenser heat source inlet CO1, a condenser heat source outlet CO2, and a condenser refrigerant outlet CO3; The absorber A includes an absorber heat source inlet A01, an absorber heat source outlet A02, an absorber solution inlet A03, and an absorber solution outlet A04. The evaporator E includes an evaporator heat source inlet E01, an evaporator heat source outlet E02, an evaporator refrigerant first inlet E03, an evaporator refrigerant outlet E04, and an evaporator refrigerant second inlet E05. The high-temperature heat source inlet is connected to the heat source inlet G01 of the generator, and the high-temperature heat source outlet is connected to the heat source outlet G02 of the generator; The medium-temperature heat source inlet is connected to the heat source inlet A01 of the absorber, the heat source outlet A02 of the absorber is connected to the heat source inlet C01 of the condenser, and the heat source outlet C02 of the condenser is connected to the medium-temperature heat source outlet. The low-temperature heat source inlet is connected to the evaporator heat source inlet E01, and the evaporator heat source outlet E02 is connected to the low-temperature heat source outlet. The generator solution outlet G04 is connected to the concentrated solution inlet 201 of the solution heat storage tank, the concentrated solution outlet 204 of the solution heat storage tank is connected to the concentrated solution inlet 103 of the solution heat exchanger, the concentrated solution outlet 104 of the solution heat exchanger is connected to the absorber solution inlet A03, the absorber solution outlet A04 is connected to the dilute solution inlet 102 of the solution heat exchanger through the second solution pump 5, and the dilute solution outlet 101 of the solution heat exchanger is connected to the generator solution inlet G03; The dilute solution outlet 202 of the solution heat storage tank is connected to the dilute solution inlet 102 of the solution heat exchanger through the first solution pump 4, and the dilute solution inlet 203 of the solution heat storage tank is connected to the dilute solution inlet 102 of the solution heat exchanger through the valve 3; The condenser refrigerant outlet CO3 is connected to the evaporator refrigerant first inlet E03; The evaporator refrigerant outlet E04 is connected to the evaporator refrigerant second inlet E05 via the refrigerant pump 6. In the above embodiment, when the high-temperature heat source is in excess relative to the low-temperature heat source, the high-temperature heat source heats the solution in the generator G. The heated solution flows into the solution storage tank 2. A portion of the high-temperature concentrated solution in the solution storage tank 2 flows out, is cooled by heat exchange in the solution heat exchanger 1, and then enters the absorber A. After absorbing water vapor in the absorber A, it flows out. Simultaneously, a portion of the low-temperature dilute solution in the solution storage tank 2 flows out, passes through the first solution pump 4, and merges with the dilute solution from the absorber A. After being heated by heat exchange in the solution heat exchanger 1, it enters the generator G again. Since the flow rate of the high-temperature concentrated solution flowing out of the concentrated solution outlet 204 of the solution storage tank is lower than the flow rate of the high-temperature concentrated solution flowing in from the concentrated solution inlet 201 of the solution storage tank, a portion of the high-temperature heat is stored in the solution storage tank 2 in the form of a high-temperature concentrated solution.

[0021] When the high-temperature heat source is insufficient compared to the low-temperature heat source, valve 3 opens. A portion of the dilute solution flowing from absorber A passes through valve 3 and flows into solution storage tank 2, while the other portion passes through solution heat exchanger 1 for heat exchange and is then heated before entering generator G. In generator G, the solution is concentrated and heated before flowing back into solution storage tank 2. The high-temperature concentrated solution in solution storage tank 2 is cooled by solution heat exchanger 1 and then enters absorber A. At this time, the flow rate of the concentrated solution flowing out of the concentrated solution outlet 204 of the solution storage tank is higher than the flow rate of the high-temperature concentrated solution flowing in from the concentrated solution inlet 201 of the solution storage tank. Therefore, the heat stored in storage tank 2 is released in the form of concentrated solution. This concentrated solution, after entering absorber A, improves the recovery capacity of the low-temperature heat source, thereby avoiding waste of the low-temperature heat source. Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0022] The difference from Example 1 is that in Example 2, as... Figure 2 As shown, the solution flowing out of the generator solution outlet G04 first enters the solution heat exchanger 1 through the concentrated solution inlet 103 of the solution heat exchanger for cooling, and then flows out of the concentrated solution outlet 104 of the solution heat exchanger before entering the solution storage tank 2. Compared to Example 1, the solution stored in the solution storage tank 2 in Example 2 has a lower temperature, less heat dissipation, and higher overall efficiency.

Claims

1. A thermal storage type lithium bromide heat pump unit, characterized in that, Includes a solution heat exchanger (1), a solution heat storage tank (2), valves (3), a first solution pump (4), a second solution pump (5), a refrigerant pump (6), a generator (G), an absorber (A), a condenser (C), and an evaporator (E); The solution heat exchanger (1) includes a concentrated solution inlet (103), a concentrated solution outlet (104), a dilute solution inlet (102), and a dilute solution outlet (101). The solution heat storage tank (2) includes a concentrated solution inlet (201), a dilute solution outlet (202), a dilute solution inlet (203), and a concentrated solution outlet (204). The generator (G) includes a generator heat source inlet (G01), a generator heat source outlet (G02), a generator solution inlet (G03), and a generator solution outlet (G04). The condenser (C) includes a condenser heat source inlet (C01), a condenser heat source outlet (C02), and a condenser refrigerant outlet (C03). The absorber (A) includes an absorber heat source inlet (A01), an absorber heat source outlet (A02), an absorber solution inlet (A03), and an absorber solution outlet (A04). The evaporator (E) includes an evaporator heat source inlet (E01), an evaporator heat source outlet (E02), an evaporator refrigerant first inlet (E03), an evaporator refrigerant outlet (E04), and an evaporator refrigerant second inlet (E05). The high-temperature heat source inlet is connected to the heat source inlet (G01) of the generator, and the high-temperature heat source outlet is connected to the heat source outlet (G02) of the generator; The medium-temperature heat source inlet is connected to the heat source inlet (A01) of the absorber, the heat source outlet (A02) of the absorber is connected to the heat source inlet (C01) of the condenser, and the heat source outlet (C02) of the condenser is connected to the medium-temperature heat source outlet. The low-temperature heat source inlet is connected to the evaporator heat source inlet (E01), and the evaporator heat source outlet (E02) is connected to the low-temperature heat source outlet; The generator solution outlet (G04) is connected to the concentrated solution inlet (201) of the solution heat storage tank, the concentrated solution outlet (204) of the solution heat storage tank is connected to the concentrated solution inlet (103) of the solution heat exchanger, the concentrated solution outlet (104) of the solution heat exchanger is connected to the absorber solution inlet (A03), the absorber solution outlet (A04) is connected to the dilute solution inlet (102) of the solution heat exchanger through the second solution pump (5), and the dilute solution outlet (101) of the solution heat exchanger is connected to the generator solution inlet (G03). The dilute solution outlet (202) of the solution heat storage tank is connected to the dilute solution inlet (102) of the solution heat exchanger through the first solution pump (4), and the dilute solution inlet (203) of the solution heat storage tank is connected to the dilute solution inlet (102) of the solution heat exchanger through the valve (3); The condenser refrigerant outlet (CO3) is connected to the evaporator refrigerant first inlet (E03); The evaporator refrigerant outlet (E04) is connected to the evaporator refrigerant second inlet (E05) via the refrigerant pump (6).

2. A thermal storage type lithium bromide heat pump unit, characterized in that: The high-temperature heat source inlet is connected to the heat source inlet (G01) of the generator, and the high-temperature heat source outlet is connected to the heat source outlet (G02) of the generator; The medium-temperature heat source inlet is connected to the heat source inlet (A01) of the absorber, the heat source outlet (A02) of the absorber is connected to the heat source inlet (C01) of the condenser, and the heat source outlet (C02) of the condenser is connected to the medium-temperature heat source outlet. The low-temperature heat source inlet is connected to the evaporator heat source inlet (E01), and the evaporator heat source outlet (E02) is connected to the low-temperature heat source outlet; The generator solution outlet (G04) is connected to the concentrated solution inlet (103) of the solution heat exchanger, the concentrated solution outlet (104) of the solution heat exchanger is connected to the concentrated solution inlet (201) of the solution heat storage tank, the concentrated solution outlet (204) of the solution heat storage tank is connected to the absorber solution inlet (A03), the absorber solution outlet (A04) is connected to the dilute solution inlet (102) of the solution heat exchanger through the second solution pump (5), and the dilute solution outlet (101) of the solution heat exchanger is connected to the generator solution inlet (G03). The dilute solution outlet (202) of the solution heat storage tank is connected to the dilute solution inlet (102) of the solution heat exchanger through the first solution pump (4), and the dilute solution inlet (203) of the solution heat storage tank is connected to the dilute solution inlet (102) of the solution heat exchanger through the valve (3); The condenser refrigerant outlet (CO3) is connected to the evaporator refrigerant first inlet (E03); The evaporator refrigerant outlet (E04) is connected to the evaporator refrigerant second inlet (E05) via the refrigerant pump (6).

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