A three-stage series internal and external ice melting ultra-low temperature cooling device and its usage method

Abstract

The present invention discloses a three-stage series internal and external ice melting ultra-low temperature district cooling equipment and its usage method, which relates to the technical field of ultra-low temperature district cooling equipment. It includes a chilled water circulation system, a base load refrigeration system, a dual-condition refrigeration system, and an ice melting system. By means of a three-stage series setting, multiple cooling conditions are provided to reduce the consumption of peak electricity during the cooling process, achieve peak shaving operation, reduce the cooling cost, and reduce the pipe network transmission and distribution energy consumption and investment. The series connection of the base load main engine and the dual-condition main engine plate heat exchanger can reduce the temperature of the chilled water below 5°C, and the ice melting plate heat exchanger can reduce the temperature of the chilled water below 2°C. Thus, when the chilled water is output through the water distributor, a larger temperature difference can be formed with the water collector, realizing rapid cooling with a large temperature difference.

Description

Technical Field

[0001] The present invention relates to the technical field of ultra-low temperature cooling equipment, and particularly to a three-stage series internal and external ice melting ultra-low temperature cooling equipment and a using method thereof. Background Art

[0002] The ice storage air-conditioning system uses off-peak electricity at night for ice making and storage, and melts ice and releases cold during the peak electricity consumption period during the day, which can cut peaks and fill valleys, balance the power grid load, reduce the construction cost of peak shaving power stations and reduce environmental pollution, and has good economic and social benefits.

[0003] However, when the existing ice storage air-conditioning system operates under some working conditions (such as when the main unit operates in a single cooling mode), the temperature difference of the chilled water is small, resulting in low cooling distribution efficiency. At the same time, the current ice storage system is generally designed as an internal ice melting system or an external ice melting system, and it cannot combine the internal ice melting and external ice melting processes to meet the goal of peak avoidance operation under peak electricity load conditions. Therefore, there is an urgent need for an ultra-low temperature cooling system that can provide a larger temperature difference and a larger ice melting speed. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a three-stage series internal and external ice melting ultra-low temperature cooling equipment and a using method thereof to improve the cooling efficiency and the power peak shaving and valley filling ratio of the ice storage air-conditioning system.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a three-stage series internal and external ice melting ultra-low temperature cooling equipment, including a chilled water circulation system, a base load refrigeration system, a dual-condition refrigeration system, and an ice melting system;

[0007] The chilled water circulation system includes a water collector, a water distributor, and a chilled water circulation pump disposed between the water collector and the water distributor; the water collector, the chilled water circulation pump, and the water distributor are connected through a chilled water circulation pipeline;

[0008] The inlet end and the outlet end of the base load refrigeration system are connected to the chilled water circulation pipeline through a base load pipeline;

[0009] The dual-condition refrigeration system includes a main unit plate heat exchanger, a dual-condition main unit, and a solution pump; the main unit plate heat exchanger, the dual-condition main unit, and the solution pump are connected through pipelines, and the cooling end of the main unit plate heat exchanger is connected to the chilled water circulation pipeline;

[0010] The ice melting system includes an ice melting pump and an ice melting plate heat exchanger; the ice melting pump and the ice melting plate heat exchanger are connected through a pipeline; the cooling end of the ice melting plate heat exchanger is connected to the chilled water circulation pipeline;

[0011] An ice storage device is provided between the dual-mode refrigeration system and the ice melting system; the ice storage device includes an ice storage tank and ice storage coils; the ice storage coils are disposed in the ice storage tank, and the ice storage tank is in communication with the ice melting system, and the coils are in communication with the dual-mode refrigeration system;

[0012] A first valve is provided in parallel with the ice storage device in the dual-mode refrigeration system.

[0013] Optionally, the base load refrigeration system includes a base load chilled water pump, a base load host, and a ninth valve sequentially arranged on the base load pipeline.

[0014] Optionally, a second valve is provided on the outlet side of the refrigeration end of the ice storage device.

[0015] Optionally, a third valve is provided in parallel with the main heat exchanger in the dual-mode refrigeration system.

[0016] Optionally, a fourth valve is provided on the inlet side of the refrigeration end of the main heat exchanger.

[0017] Optionally, a fifth valve is provided on the outlet side of the cooling supply end of the main heat exchanger.

[0018] Optionally, a sixth valve is provided in parallel with the main heat exchanger on the chilled water circulation pipeline.

[0019] Optionally, a seventh valve is provided on the outlet side of the cooling supply end of the ice melting heat exchanger.

[0020] Optionally, an eighth valve is provided in parallel with the ice melting heat exchanger on the chilled water circulation pipeline.

[0021] The present invention also provides a method for using a three-stage series internal and external ice melting ultra-low temperature cooling device, including the following working conditions:

[0022] In the first working condition, the dual-mode main machine makes ice, the dual-mode main machine, the ice storage device, and the solution pump are in operation, the second valve and the third valve are opened, the base load main machine, the main heat exchanger, the ice melting heat exchanger, the ice melting pump, the base load chilled water pump, and the chilled water circulation water pump are stopped, and the first valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, the eighth valve, and the ninth valve are closed;

[0023] In the second working condition, the dual-mode main machine makes ice and supplies cold, the dual-mode main machine, the ice storage device, the main heat exchanger, the solution pump, and the chilled water circulation pump are in operation, the second valve, the fifth valve, and the eighth valve are opened, the base load main machine, the ice melting heat exchanger, the ice melting pump, and the base load chilled water pump are stopped, the first valve, the sixth valve, the seventh valve, and the ninth valve are closed, and the third valve and the fourth valve are adjusted;

[0024] In the third operating condition, the dual-mode main unit makes ice and provides base load cooling. The dual-mode main unit, base load main unit, ice storage device, solution pump, base load chilled water pump, and chilled water circulation pump are in operation. The second valve, third valve, sixth valve, eighth valve, and ninth valve are open. The main unit plate heat exchanger, ice melting plate heat exchanger, and ice melting pump are shut down. The first valve, fourth valve, fifth valve, and seventh valve are closed.

[0025] In the fourth operating condition, the dual-mode main unit makes ice and provides ice melting cooling. The dual-mode main unit, ice storage device, ice melting plate heat exchanger, solution pump, ice melting pump, and chilled water circulation pump are in operation. The second valve, third valve, sixth valve, and seventh valve are open. The base load main unit, main unit plate heat exchanger, and base load chilled water pump are shut down. The first valve, fourth valve, fifth valve, eighth valve, and ninth valve are closed.

[0026] In the fifth operating condition, the base load main unit provides cooling. The base load main unit, base load chilled water pump, and chilled water circulation pump are in operation. The sixth valve, eighth valve, and ninth valve are open. The dual-mode main unit, ice storage device, main unit plate heat exchanger, ice melting plate heat exchanger, solution pump, and ice melting pump are shut down. The first valve, second valve, third valve, fourth valve, fifth valve, and seventh valve are closed.

[0027] In the sixth operating condition, the dual-mode main unit provides cooling. The dual-mode main unit, ice storage device, main unit plate heat exchanger, solution pump, and chilled water circulation pump are in operation. The second valve, fourth valve, fifth valve, and eighth valve are open. The base load main unit, ice melting plate heat exchanger, ice melting pump, and base load chilled water pump are shut down. The first valve, third valve, sixth valve, seventh valve, and ninth valve are closed.

[0028] In the seventh operating condition, the base load main unit and the dual-mode main unit provide cooling. The dual-mode main unit, base load main unit, ice storage device, main unit plate heat exchanger, solution pump, base load chilled water pump, and chilled water circulation pump are in operation. The first valve, fourth valve, fifth valve, eighth valve, and ninth valve are open. The ice melting plate heat exchanger and the ice melting pump are shut down. The second valve, third valve, sixth valve, and seventh valve are closed.

[0029] In the eighth operating condition, the base load main unit and external ice melting provide cooling. The base load main unit, ice storage device, ice melting plate heat exchanger, ice melting pump, base load chilled water pump, and chilled water circulation pump are in operation. The first valve, second valve, third valve, fourth valve, fifth valve, and eighth valve are open. The dual-mode main unit, main unit plate heat exchanger, and solution pump are shut down. The sixth valve, seventh valve, and ninth valve are shut down.

[0030] In the ninth operating condition, with dual-condition main engine and external ice storage cooling, the dual-condition main engine, ice storage device, main engine plate heat exchanger, ice melting plate heat exchanger, solution pump, ice melting pump, and chilled water circulation pump are in operation, the base load main engine and base load chilled water pump are shut down, the first valve, fourth valve, fifth valve, and seventh valve are open, and the second valve, third valve, sixth valve, eighth valve, and ninth valve are closed.

[0031] In the tenth operating condition, with base load main engine, dual-condition main engine and external ice storage cooling, the dual-condition main engine, base load main engine, ice storage device, main engine plate heat exchanger, ice melting plate heat exchanger, solution pump, ice melting pump, base load chilled water pump, and chilled water circulation pump are in operation, the first valve, fourth valve, fifth valve, seventh valve, and ninth valve are open, and the second valve, third valve, sixth valve, and eighth valve are closed.

[0032] In the eleventh operating condition, with base load main engine and internal and external ice storage cooling, the base load main engine, ice storage device, main engine plate heat exchanger, ice melting plate heat exchanger, solution pump, ice melting pump, base load chilled water pump, and chilled water circulation pump are in operation, the dual-condition main engine is shut down, the second valve, fourth valve, fifth valve, seventh valve, and ninth valve are open, and the first valve, third valve, sixth valve, and eighth valve are closed.

[0033] In the twelfth operating condition, with dual-condition main engine and internal and external ice storage cooling, the dual-condition main engine, ice storage device, main engine plate heat exchanger, ice melting plate heat exchanger, solution pump, ice melting pump, and chilled water circulation pump are in operation, the base load main engine and base load chilled water pump are shut down, the fifth valve and seventh valve are open, the sixth valve, eighth valve, and ninth valve are closed, and the first valve, second valve, third valve, and fourth valve are adjusted.

[0034] In the thirteenth operating condition, with base load main engine, dual-condition main engine and internal and external ice storage cooling, the dual-condition main engine, base load main engine, ice storage device, main engine plate heat exchanger, ice melting plate heat exchanger, solution pump, ice melting pump, base load chilled water pump, and chilled water circulation pump are in operation, the fifth valve, seventh valve, and ninth valve are open, the sixth valve and eighth valve are closed, and the first valve, second valve, third valve, and fourth valve are adjusted.

[0035] The present invention has achieved the following technical effects compared with the prior art:

[0036] 1. By means of a three-stage series connection, a greater temperature difference of chilled water can be provided, thereby improving the refrigeration efficiency.

[0037] 2. The ice melting is faster. By jointly using internal ice melting and external ice melting, the ice melting speed is accelerated, while improving the power peak shaving and valley filling ratio, the operation energy consumption and cost of the equipment are reduced. Description of the Drawings

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0039] Figure 1 It is a schematic structural diagram of the three-stage series internal and external ice-melting ultra-low temperature cooling equipment of the present invention.

[0040] Description of reference numerals: 1, water collector; 2, base load chilled water pump; 3, base load main unit; 4, water distributor; 5, chilled water circulation pump; 6, main unit plate heat exchanger; 7, ice-melting plate heat exchanger; 8, solution pump; 9, dual-condition main unit; 10, ice storage device; 11, ice-melting pump;

[0041] V1, first valve; V2, second valve; V3, third valve; V4, fourth valve; V5, fifth valve; V6, sixth valve; V7, seventh valve; V8, eighth valve; V9, ninth valve. Specific embodiments

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

[0043] Embodiment 1:

[0044] As Figure 1As shown in the figure, this embodiment provides a three-stage series internal and external ice melting ultra-low temperature cooling equipment, including a chilled water circulation system, a base load refrigeration system, a dual-condition refrigeration system, and an ice melting system; the chilled water circulation system includes a water collector 1, a water distributor 4, and a chilled water circulation pump 5 arranged between the water collector 1 and the water distributor 4; the water collector 1, the chilled water circulation pump 5, and the water distributor 4 are connected through a chilled water circulation pipeline; the inlet end and the outlet end of the base load refrigeration system are connected to the chilled water circulation pipeline through a base load pipeline; the dual-condition refrigeration system includes a main heat exchanger 6, a dual-condition main unit 9, and a solution pump 8; the main heat exchanger 6, the dual-condition main unit 9, and the solution pump 8 are connected through pipelines, and the cooling end of the main heat exchanger 6 is connected to the chilled water circulation pipeline; the ice melting system includes an ice melting pump 11 and an ice melting plate heat exchanger 7; the ice melting pump 11 and the ice melting plate heat exchanger 7 are connected through a pipeline; the cooling end of the ice melting plate heat exchanger 7 is connected to the chilled water circulation pipeline; an ice storage device is arranged between the dual-condition refrigeration system and the ice melting system; the ice storage device 10 includes an ice storage tank and ice storage coils; the ice storage coils are arranged in the ice storage tank, and the ice storage tank is connected to the ice melting system, and the ice storage coils are connected to the dual-condition refrigeration system; a first valve V1 is arranged in parallel with the ice storage device 10 in the dual-condition refrigeration system.

[0045] In this specific embodiment, the base load refrigeration system includes a base load chilled water pump 2, a base load main unit 3, and a ninth valve V9 arranged in sequence on the base load pipeline. A second valve V2 is arranged on the outlet side of the refrigeration end of the ice storage device 10. A third valve V3 is arranged in parallel with the main heat exchanger 6 in the dual-condition refrigeration system. A fourth valve V4 is arranged on the inlet side of the refrigeration end of the main heat exchanger 6. A fifth valve V5 is arranged on the outlet side of the cooling end of the main heat exchanger 6. A sixth valve V6 is arranged in parallel with the main heat exchanger 6 on the chilled water circulation pipeline. A seventh valve V7 is arranged on the outlet side of the cooling end of the ice melting plate heat exchanger 7. An eighth valve V8 is arranged in parallel with the ice melting plate heat exchanger 7 on the chilled water circulation pipeline.

[0046] In a more specific embodiment, the solution in the dual-condition refrigeration system is an ethylene glycol solution with a mass concentration of 25%. During ice melting, the dual-condition refrigeration system adopts an internal ice melting mode; the ice melting system adopts an external ice melting mode to directly wash the outer surface of the ice coil, with a faster ice melting speed, enabling the ice melting plate heat exchanger 7 to provide a lower temperature output, thereby reducing the running time of the dual-condition main unit 9, reducing the power consumption of peak electricity, and reducing the cost of cooling.

[0047] In this embodiment, the base load host 3 and the host plate heat exchanger 6 are connected in series, which can reduce the temperature of the chilled water to below 5°C. The ice melting plate heat exchanger 7 can reduce the temperature of the chilled water to below 2°C. Therefore, when the chilled water is output through the water distributor 4, a larger temperature difference can be formed with the return water temperature of the water collector, achieving rapid cooling.

[0048] Embodiment 2:

[0049] This embodiment provides a method for using a three-stage series internal and external ice melting ultra-low temperature cooling device based on Embodiment 1, including the following operating conditions:

[0050] In the first operating condition, the dual-mode host 9 makes ice. The dual-mode host 9, the ice storage device 10, and the solution pump 8 are in operation. The second valve V2 and the third valve V3 are opened. The base load host 3, the host plate heat exchanger 6, the ice melting plate heat exchanger 7, the ice melting pump 11, the base load chilled water pump 2, and the chilled water circulation pump are shut down. The first valve V1, the fourth valve V4, the fifth valve V5, the sixth valve V6, the seventh valve V7, the eighth valve V8, and the ninth valve V9 are closed;

[0051] In the second operating condition, the dual-mode host 9 makes ice and supplies cold. The dual-mode host 9, the ice storage device 10, the host plate heat exchanger 6, the solution pump 8, and the chilled water circulation pump 5 are in operation. The second valve V2, the fifth valve V5, and the eighth valve V8 are opened. The base load host 3, the ice melting plate heat exchanger 7, the ice melting pump 11, and the base load chilled water pump 2 are shut down. The first valve V1, the sixth valve V6, the seventh valve V7, and the ninth valve V9 are closed. The third valve V3 and the fourth valve V4 are adjusted;

[0052] In the third operating condition, the dual-mode host 9 makes ice and the base load supplies cold. The dual-mode host 9, the base load host 3, the ice storage device 10, the solution pump 8, the base load chilled water pump 2, and the chilled water circulation pump 5 are in operation. The second valve V2, the third valve V3, the sixth valve V6, the eighth valve V8, and the ninth valve V9 are opened. The host plate heat exchanger 6, the ice melting plate heat exchanger 7, and the ice melting pump 11 are shut down. The first valve V1, the fourth valve V4, the fifth valve V5, and the seventh valve V7 are closed,

[0053] In the fourth operating condition, the dual-mode host 9 makes ice and the ice melting supplies cold. The dual-mode host 9, the ice storage device 10, the ice melting plate heat exchanger 7, the solution pump 8, the ice melting pump 11, and the chilled water circulation pump 5 are in operation. The second valve V2, the third valve V3, the sixth valve V6, and the seventh valve V7 are opened. The base load host 3, the host plate heat exchanger 6, and the base load chilled water pump 2 are shut down. The first valve V1, the fourth valve V4, the fifth valve V5, the eighth valve V8, and the ninth valve V9 are closed,

[0054] In the fifth operating condition, the base-load main chiller 3 provides cooling. The base-load main chiller 3, the base-load chilled water pump 2, and the chilled water circulation pump 5 are in operation. The sixth valve V6, the eighth valve V8, and the ninth valve V9 are open. The dual-mode main chiller 9, the ice storage device 10, the main chiller plate heat exchanger 6, the ice-melting plate heat exchanger 7, the solution pump 8, and the ice-melting pump 11 are shut down. The first valve V1, the second valve V2, the third valve V3, the fourth valve V4, the fifth valve V5, and the seventh valve V7 are closed.

[0055] In the sixth operating condition, the dual-mode main chiller 9 provides cooling. The dual-mode main chiller 9, the ice storage device 10, the main chiller plate heat exchanger 6, the solution pump 8, and the chilled water circulation pump 5 are in operation. The second valve V2, the fourth valve V4, the fifth valve V5, and the eighth valve V8 are open. The base-load main chiller 3, the ice-melting plate heat exchanger 7, the ice-melting pump 11, and the base-load chilled water pump 2 are shut down. The first valve V1, the third valve V3, the sixth valve V6, the seventh valve V7, and the ninth valve V9 are closed.

[0056] In the seventh operating condition, the base-load main chiller 3 and the dual-mode main chiller 9 provide cooling. The dual-mode main chiller 9, the base-load main chiller 3, the ice storage device 10, the main chiller plate heat exchanger 6, the solution pump 8, the base-load chilled water pump 2, and the chilled water circulation pump 5 are in operation. The first valve V1, the fourth valve V4, the fifth valve V5, the eighth valve V8, and the ninth valve V9 are open. The ice-melting plate heat exchanger 7 and the ice-melting pump 11 are shut down. The second valve V2, the third valve V3, the sixth valve V6, and the seventh valve V7 are closed.

[0057] In the eighth operating condition, the base-load main chiller 3 and external ice-melting provide cooling. The base-load main chiller 3, the ice storage device 10, the ice-melting plate heat exchanger 7, the ice-melting pump 11, the base-load chilled water pump 2, and the chilled water circulation pump 5 are in operation. The first valve V1, the second valve V2, the third valve V3, the fourth valve V4, the fifth valve V5, and the eighth valve V8 are open. The dual-mode main chiller 9, the main chiller plate heat exchanger 6, and the solution pump 8 are shut down. The sixth valve V6, the seventh valve V7, and the ninth valve V9 are shut down.

[0058] In the ninth operating condition, the dual-mode main chiller 9 and external ice-melting provide cooling. The dual-mode main chiller 9, the ice storage device 10, the main chiller plate heat exchanger 6, the ice-melting plate heat exchanger 7, the solution pump 8, the ice-melting pump 11, and the chilled water circulation pump 5 are in operation. The base-load main chiller 3 and the base-load chilled water pump 2 are shut down. The first valve V1, the fourth valve V4, the fifth valve V5, and the seventh valve V7 are open. The second valve V2, the third valve V3, the sixth valve V6, the eighth valve V8, and the ninth valve V9 are closed.

[0059] Under the tenth operating condition, the base load main engine 3, the dual-mode main engine 9, and external ice storage cooling are adopted. The dual-mode main engine 9, the base load main engine 3, the ice storage device 10, the main engine plate heat exchanger 6, the ice melting plate heat exchanger 7, the solution pump 8, the ice melting pump 11, the base load chilled water pump 2, and the chilled water circulation pump 5 are in the operating state. The first valve V1, the fourth valve V4, the fifth valve V5, the seventh valve V7, and the ninth valve V9 are opened, and the second valve V2, the third valve V3, the sixth valve V6, and the eighth valve V8 are closed.

[0060] Under the eleventh operating condition, the base load main engine 3 and internal and external ice storage cooling are adopted. The base load main engine 3, the ice storage device 10, the main engine plate heat exchanger 6, the ice melting plate heat exchanger 7, the solution pump 8, the ice melting pump 11, the base load chilled water pump 2, and the chilled water circulation pump 5 are in the operating state. The dual-mode main engine 9 is shut down. The second valve V2, the fourth valve V4, the fifth valve V5, the seventh valve V7, and the ninth valve are opened, and the first valve V1, the third valve V3, the sixth valve V6, and the eighth valve V8 are closed.

[0061] Under the twelfth operating condition, the dual-mode main engine 9 and internal and external ice storage cooling are adopted. The dual-mode main engine 9, the ice storage device 10, the main engine plate heat exchanger 6, the ice melting plate heat exchanger 7, the solution pump 8, the ice melting pump 11, and the chilled water circulation pump 5 are in the operating state. The base load main engine 3 and the base load chilled water pump 2 are shut down. The fifth valve V5 and the seventh valve V7 are opened, the sixth valve V6, the eighth valve V8, and the ninth valve are closed, and the first valve V1, the second valve V2, the third valve V3, and the fourth valve V4 are adjusted.

[0062] Under the thirteenth operating condition, the base load main engine 3, the dual-mode main engine 9, and internal and external ice storage cooling are adopted. The dual-mode main engine 9, the base load main engine 3, the ice storage device 10, the main engine plate heat exchanger 6, the ice melting plate heat exchanger 7, the solution pump 8, the ice melting pump 11, the base load chilled water pump 2, and the chilled water circulation pump 5 are in the operating state. The fifth valve V5, the seventh valve V7, and the ninth valve V9 are opened, the sixth valve V6 and the eighth valve V8 are closed, and the first valve V1, the second valve V2, the third valve V3, and the fourth valve V4 are adjusted.

[0063] It should be noted that for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention, and any reference signs in the claims should not be regarded as limiting the claims involved.

[0064] In this specification, specific examples are used to illustrate the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A method for using a three-stage series internal and external ice melting ultra-low temperature cooling device, characterized in that Three-stage series internal and external ice-melting ultra-low temperature cooling equipment, including a chilled water circulation system, a base load refrigeration system, a dual-condition refrigeration system, and an ice-melting system; The chilled water circulation system includes a water collector, a water distributor, and a chilled water circulation pump disposed between the water collector and the water distributor; the water collector, the chilled water circulation pump, and the water distributor are connected through a chilled water circulation pipeline; The inlet end and the outlet end of the base load refrigeration system are connected to the chilled water circulation pipeline through a base load pipeline; The dual-condition refrigeration system includes a main engine plate heat exchanger, a dual-condition main engine, and a solution pump; the main engine plate heat exchanger, the dual-condition main engine, and the solution pump are connected through pipelines, and the cooling end of the main engine plate heat exchanger is connected to the chilled water circulation pipeline; The ice-melting system includes an ice-melting pump and an ice-melting plate heat exchanger; the ice-melting pump and the ice-melting plate heat exchanger are connected through a pipeline; the cooling end of the ice-melting plate heat exchanger is connected to the chilled water circulation pipeline; An ice storage device is provided between the dual-condition refrigeration system and the ice-melting system; the ice storage device includes an ice storage tank and an ice storage coil; the ice storage coil is disposed in the ice storage tank, and the ice storage tank is connected to the ice-melting system, and the ice storage coil is connected to the dual-condition refrigeration system; A first valve is provided in parallel with the ice storage device in the dual-condition refrigeration system, The base load refrigeration system includes a base load chilled water pump, a base load main engine, and a ninth valve sequentially arranged on the base load pipeline, A second valve is provided on the outlet side of the refrigeration end of the ice storage device, A third valve is provided in parallel with the main engine plate heat exchanger in the dual-condition refrigeration system, A fourth valve is provided on the inlet side of the refrigeration end of the main engine plate heat exchanger, A fifth valve is provided on the outlet side of the cooling end of the main engine plate heat exchanger, A sixth valve is provided in parallel with the main engine plate heat exchanger on the chilled water circulation pipeline, A seventh valve is provided on the outlet side of the cooling end of the ice-melting plate heat exchanger, An eighth valve is provided in parallel with the ice-melting plate heat exchanger on the chilled water circulation pipeline; The usage method of the three-stage series internal and external ice-melting ultra-low temperature cooling equipment includes the following working conditions: The first working condition: the dual-condition main engine makes ice, the dual-condition main engine, the ice storage device, and the solution pump are in the running state, the second valve and the third valve are opened, the base load main engine, the main engine plate heat exchanger, the ice-melting plate heat exchanger, the ice-melting pump, the base load chilled water pump, and the chilled water circulation pump are shut down, and the first valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, the eighth valve, and the ninth valve are closed; The second working condition: the dual-condition main engine makes ice and supplies cooling, the dual-condition main engine, the ice storage device, the main engine plate heat exchanger, the solution pump, and the chilled water circulation pump are in the running state, the second valve, the fifth valve, and the eighth valve are opened, the base load main engine, the ice-melting plate heat exchanger, the ice-melting pump, and the base load chilled water pump are shut down, the first valve, the sixth valve, the seventh valve, and the ninth valve are closed, and the third valve and the fourth valve are adjusted; In the third operating condition, the dual-mode main unit makes ice and provides base load cooling. The dual-mode main unit, base load main unit, ice storage device, solution pump, base load chilled water pump, and chilled water circulation pump are in operation. The second valve, third valve, sixth valve, eighth valve, and ninth valve are open. The main unit plate heat exchanger, ice melting plate heat exchanger, and ice melting pump are out of operation. The first valve, fourth valve, fifth valve, and seventh valve are closed. In the fourth operating condition, the dual-mode main unit makes ice and provides ice melting cooling. The dual-mode main unit, ice storage device, ice melting plate heat exchanger, solution pump, ice melting pump, and chilled water circulation pump are in operation. The second valve, third valve, sixth valve, and seventh valve are open. The base load main unit, main unit plate heat exchanger, and base load chilled water pump are out of operation. The first valve, fourth valve, fifth valve, eighth valve, and ninth valve are closed. In the fifth operating condition, the base load main unit provides cooling. The base load main unit, base load chilled water pump, and chilled water circulation pump are in operation. The sixth valve, eighth valve, and ninth valve are open. The dual-mode main unit, ice storage device, main unit plate heat exchanger, ice melting plate heat exchanger, solution pump, and ice melting pump are out of operation. The first valve, second valve, third valve, fourth valve, fifth valve, and seventh valve are closed. In the sixth operating condition, the dual-mode main unit provides cooling. The dual-mode main unit, ice storage device, main unit plate heat exchanger, solution pump, and chilled water circulation pump are in operation. The second valve, fourth valve, fifth valve, and eighth valve are open. The base load main unit, ice melting plate heat exchanger, ice melting pump, and base load chilled water pump are out of operation. The first valve, third valve, sixth valve, seventh valve, and ninth valve are closed. In the seventh operating condition, the base load main unit and the dual-mode main unit provide cooling. The dual-mode main unit, base load main unit, ice storage device, main unit plate heat exchanger, solution pump, base load chilled water pump, and chilled water circulation pump are in operation. The first valve, fourth valve, fifth valve, eighth valve, and ninth valve are open. The ice melting plate heat exchanger and ice melting pump are out of operation. The second valve, third valve, sixth valve, and seventh valve are closed. In the eighth operating condition, the base load main unit and external ice melting provide cooling. The base load main unit, ice storage device, ice melting plate heat exchanger, ice melting pump, base load chilled water pump, and chilled water circulation pump are in operation. The first valve, second valve, third valve, fourth valve, fifth valve, and eighth valve are open. The dual-mode main unit, main unit plate heat exchanger, and solution pump are out of operation. The sixth valve, seventh valve, and ninth valve are out of operation. In the ninth operating condition, the dual-mode main unit and external ice melting provide cooling. The dual-mode main unit, ice storage device, main unit plate heat exchanger, ice melting plate heat exchanger, solution pump, ice melting pump, and chilled water circulation pump are in operation. The base load main unit and base load chilled water pump are out of operation. The first valve, fourth valve, fifth valve, and seventh valve are open. The second valve, third valve, sixth valve, eighth valve, and ninth valve are closed. The tenth operating condition: base load main engine, dual-mode main engine and external melt ice cooling. The dual-mode main engine, base load main engine, ice storage device, main engine plate heat exchanger, melt ice plate heat exchanger, solution pump, melt ice pump, base load chilled water pump and chilled water circulation pump are in operation. The first valve, fourth valve, fifth valve, seventh valve and ninth valve are open, and the second valve, third valve, sixth valve and eighth valve are closed. The eleventh operating condition: base load main engine and internal and external melt ice cooling. The base load main engine, ice storage device, main engine plate heat exchanger, melt ice plate heat exchanger, solution pump, melt ice pump, base load chilled water pump and chilled water circulation pump are in operation. The dual-mode main engine is shut down. The second valve, fourth valve, fifth valve, seventh valve and ninth valve are open, and the first valve, third valve, sixth valve and eighth valve are closed. The twelfth operating condition: dual-mode main engine and internal and external melt ice cooling. The dual-mode main engine, ice storage device, main engine plate heat exchanger, melt ice plate heat exchanger, solution pump, melt ice pump and chilled water circulation pump are in operation. The base load main engine and base load chilled water pump are shut down. The fifth valve and seventh valve are open, and the sixth valve, eighth valve and ninth valve are closed. The first valve, second valve, third valve and fourth valve are adjusted. The thirteenth operating condition: base load main engine, dual-mode main engine and internal and external melt ice cooling. The dual-mode main engine, base load main engine, ice storage device, main engine plate heat exchanger, melt ice plate heat exchanger, solution pump, melt ice pump, base load chilled water pump and chilled water circulation pump are in operation. The fifth valve, seventh valve and ninth valve are open, and the sixth valve and eighth valve are closed. The first valve, second valve, third valve and fourth valve are adjusted.

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