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

An internal circulation type clathrate hydrate-based cold storage method, comprising:

• cold storage stage at night:
• the water chilling unit providing the secondary refrigerant at a low temperature, and the secondary refrigerant being conveyed by the first solution pump to the hydrate-based cold storage tank through the first flow meter, the first one-way valve, and the first two-way valve, and exchanging heat with the hydrate-based cold storage working medium through the evaporator coil for a heat exchange and fully absorbing the heat in the hydrate-based cold storage tank for a hydrate-based phase change energy storage;
• after the heat exchange being completed, the secondary refrigerant flowing back to the water chilling unit through the second two-way valve, the fourth one-way valve, and the second flow meter, and being cooled again to complete a cold storage cycle;
• after the cold storage cycle starting, the crystallization promoting device introducing hydrate particles into the hydrate-based cold storage tank through the first gas pump 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 being pumped by the second gas pump to the gas distribution device for a gas distribution, then being conveyed to the gas disturbance device for a continuous gas disturbance, and then being pumped by the second gas pump again for a gas internal circulation to reduce a loss of a cold load and accelerate an energy storage;
• the system monitoring device 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 in real time;
• and
• cold energy supply stage in daytime:
• a mode of cold energy supply by the hydrate-based cold storage tank alone:
• the secondary refrigerant in the hydrate-based cold storage tank being pumped by the second solution pump to the heat exchange system through the first two-way valve and the second one-way valve, fully absorbing heat in the heat exchange system through a finned tube heat exchanger with a fan, then flowing back to the hydrate-based cold storage tank through the third one-way valve and the second two-way valve, and being cooled again through a heat exchange with the hydrate-based cold storage working medium at a low temperature in the evaporator coil to complete a cold energy supply cycle;
• a mode of cold energy supply by the water chilling unit alone:
• the water chilling unit providing the secondary refrigerant, and the secondary refrigerant being pumped by the first solution pump to the finned tube heat exchanger in the heat exchange system through the first flow meter, the first one-way valve (5), the second one-way valve, and the second solution pump for a heat absorption, and then flowing back to the hydrate-based cold storage tank through the third one-way valve, the fourth one-way valve, and the second flow meter to be cooled again to complete a cold energy supply cycle;
• and
• a mode of cold energy supply by the hydrate-based cold storage tank in combination with the water chilling unit:
• the water chilling unit and the hydrate-based cold storage tank simultaneously providing the secondary refrigerant, the secondary refrigerant being pumped by the first solution pump and the second solution pump to the heat exchange system, the finned tube heat exchanger with the fan operating at a full load to allow the secondary refrigerant at a low temperature to fully absorb heat in the heat exchange system, then a part of the secondary refrigerant flowing back to the hydrate-based cold storage tank 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 evaporator coil, and the other part of the secondary refrigerant flowing back to the water chilling unit and being cooled again to complete a combined cold energy supply cycle.