Internal circulation type clathrate hydrate-based cold storage system and method

A cold storage method using a cold storage system, wherein the cold storage system comprises:

• a chiller (1), a first solution pump (3), a first flow meter (4), a first one-way valve (5), a first two-way valve (6), a second one-way valve (7), a second solution pump (8), a heat exchanger (10), a third one-way valve (11), a fourth one-way valve (12), a second flow meter (13), a system monitor (14), a direct-current power supply and circuit controller (15), a concentration detector (21), a second gas pump (24), a second two-way valve (25), a gas distributor (28), a hydrate-based cold storage tank (29), a gas disturbance generator (31), a first branch pipeline (34), a second branch pipeline (35), a third branch pipeline (36), a fourth branch pipeline (37), a fifth branch pipeline (38), and a temperature sensor group, wherein
• an outlet end of the chiller (1) is in communication with an inlet of the heat exchanger (10) through the first branch pipeline (34), and an inlet end of the chiller (1) is in communication with an outlet of the heat exchanger (10) through the second branch pipeline (35);
• the first solution pump (3), the first flow meter (4), the first one-way valve (5), the second one-way valve (7), and the second solution pump (8) are sequentially arranged on the first branch pipeline (34) along a flow direction of a secondary refrigerant;
• the third one-way valve (11), the fourth one-way valve (12), and the second flow meter (13) are sequentially arranged on the second branch pipeline (35) along the flow direction of the secondary refrigerant;
• the hydrate-based cold storage tank (29) is a sealed container filled therein with a hydrate-based cold storage working medium, and a coil (33) is arranged in the hydrate-based cold storage tank (29) and immersed in the hydrate-based cold storage working medium;
• the temperature sensor group is arranged in the hydrate-based cold storage tank (29), and a terminal of the temperature sensor group is connected to the system monitor (14);
• the first branch pipeline (34) between the first one-way valve (5) and the second one-way valve (7) is in communication with a first end of the coil (33) through the third branch pipeline (36), and the second branch pipeline (35) between the third one-way valve (11) and the fourth one-way valve (12) is in communication with a second end of the coil (33) through the fourth branch pipeline (37);
• the first two-way valve (6) is arranged on the third branch pipeline (36), and the second two-way valve (25) is arranged on the fourth branch pipeline (37);
• the fifth branch pipeline (38) is arranged outside the hydrate-based cold storage tank (29), an upper end of the fifth branch pipeline (38) is in communication with a top of an inner wall of the hydrate-based cold storage tank (29), a lower end of the fifth branch pipeline (38) is connected to the gas distributor (28), the gas distributor (28) is connected to the gas disturbance generator (31) arranged in the hydrate-based cold storage tank (29) through a hose, the second gas pump (24) is arranged on the fifth branch pipeline (38), and the fifth branch pipeline (38) is a thermal insulation pipe;
• and
• a heat exchanger (9) is arranged in the heat exchanger (10);
• and the direct-current power supply and circuit controller (15) for controlling a system power supply is arranged in the internal circulation type clathrate hydrate-based cold storage system;
• wherein the method comprises storing cold energy at night, the chiller (1) providing the secondary refrigerant at a low temperature, and the secondary refrigerant being conveyed by the first solution pump (3) to the hydrate-based cold storage tank (29) through the first flow meter (4), the first one-way valve (5), and the first two-way valve (6), and exchanging heat with the hydrate-based cold storage working medium through the coil (33) for a heat exchange and fully absorbing the heat in the hydrate-based cold storage tank (29) for a hydrate-based phase change energy storage;
• after the heat exchange being completed, the secondary refrigerant flowing back to the chiller (1) through the second two-way valve (25), the fourth one-way valve (12), and the second flow meter (13), and being cooled again to complete a cold storage cycle;
• after the cold storage cycle starting, the crystallization promoting assembly (2) introducing hydrate particles into the hydrate-based cold storage tank (29) through the first gas pump (20) to induce a rapid nucleation of the hydrate-based cold storage working medium, and meanwhile, cold air from a top of the hydrate-based cold storage tank (29) being pumped by the second gas pump (24) to the gas distributor (28) for a gas distribution, then being conveyed to the gas disturbance generator (31) for a continuous gas disturbance, and then being pumped by the second gas pump (24) again for a gas internal circulation to reduce a loss of a cold load and accelerate an energy storage;
• the system monitor (14) monitoring a temperature change before and after absorbing the heat by the secondary refrigerant, a temperature change of the hydrate-based cold storage working medium, and a temperature change in the hydrate-based cold storage tank (29) in real time;
• and
• wherein the method further comprises supplying cold energy in daytime using one of a first mode, a second mode or a third mode, wherein:
• in the first mode, the secondary refrigerant in the hydrate-based cold storage tank (29) being pumped by the second solution pump (8) to the heat exchanger (10) through the first two-way valve (6) and the second one-way valve (7), fully absorbing heat in the heat exchanger (10) through a finned tube heat exchanger (9) with a fan, then flowing back to the hydrate-based cold storage tank (29) through the third one-way valve (11) and the second two-way valve (25), and being cooled again through a heat exchange with the hydrate-based cold storage working medium at a low temperature in the coil (33) to complete a cold energy supply cycle;
• in the second mode, the chiller (1) providing the secondary refrigerant, and the secondary refrigerant being pumped by the first solution pump (3) to the finned tube heat exchanger (9) in the heat exchanger (10) through the first flow meter (4), the first one-way valve (5), the second one-way valve (7), and the second solution pump (8) for a heat absorption, and then flowing back to the hydrate-based cold storage tank (29) through the third one-way valve (11), the fourth one-way valve (12), and the second flow meter (13) to be cooled again to complete a cold energy supply cycle;
• and
• in the third mode, the chiller (1) and the hydrate-based cold storage tank (29) simultaneously providing the secondary refrigerant, the secondary refrigerant being pumped by the first solution pump (3) and the second solution pump (8) to the heat exchanger (10), the finned tube heat exchanger (9) with the fan operating at a full load to allow the secondary refrigerant at a low temperature to fully absorb heat in the heat exchanger (10), then a part of the secondary refrigerant flowing back to the hydrate-based cold storage tank (29) and being cooled to the low temperature again through a heat exchange with the hydrate-based cold storage working medium at the low temperature via the coil (33), and the other part of the secondary refrigerant flowing back to the chiller (1) and being cooled again to complete a combined cold energy supply cycle.