LNG cold energy gradient utilization method for conducting power generation by adopting cold energy
A cold energy and cascade technology, applied in the field of cascaded utilization of LNG cold energy using cold energy to generate electricity, can solve the problems of unreasonable utilization of cold energy, reduced effect of cold energy utilization, and large losses, so as to improve energy utilization efficiency and improve Cooling recovery rate, effect of reducing vaporization cost
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Embodiment 1
[0068] like Figure 10 Shown, adopt the LNG cold energy cascade utilization method of cold energy power generation, it comprises the following steps:
[0069] S1. Use LNG cold energy to generate electricity through direct expansion method, secondary media method or combined method;
[0070] S2. Use the cold energy of LNG after power generation to crush waste rubber at low temperature;
[0071] S3. Utilize the cold energy of LNG after the waste rubber is pulverized at low temperature to cool the warehouse.
[0072] According to the thermodynamic calculation method, the process The loss calculation process is as follows:
[0073] ①Cold power generation
[0074] It can be seen from the above process that: T 0 =193K; R=0.520kJ / (kmol·K);
[0075] T=111K; c p =2.16kJ / (kg·K);
[0076] p=0.1MPa; p 0 =0.5MPa; r=505kJ / kg.
[0077] ex stands for single stage process ; EX stands for total plan .
[0078] pressure :
[0079] ex p =T 0 RIn(p / p 0 )=193×0.520×In(0.1 / 0.5)...
Embodiment 2
[0092] like Figure 11 Shown, adopt the LNG cold energy cascade utilization method of cold energy power generation, it comprises the following steps:
[0093] S1. Use LNG cold energy to generate electricity through direct expansion method, secondary media method or combined method;
[0094] S2. Use the cold energy of LNG after power generation to crush waste rubber at low temperature;
[0095] S3. Seawater desalination is carried out by utilizing the cold energy of LNG after the waste rubber is pulverized at low temperature.
[0096] ①Cold power generation
[0097] ex p =-161.5kJ / kg; ex c,s =53.5kJ / kg; ex c,l =373.1kJ / kg; ex=265.0kJ / kg
[0098] ②Low temperature crushing and shredding of waste
[0099] ex p =-101.5kJ / kg; ex c,s =4.8kJ / kg; ex c,l =78.8kJ / kg; ex=-18.2kJ / kg
[0100] ③ Sea water desalination
[0101] ex p =131.1kJ / kg; ex c,s =18.7kJ / kg; ex c,l =147.2kJ / kg; ex=297.0kJ / kg
[0102] EX=543.8kJ / kg.
Embodiment 3
[0104] like Figure 12 Shown, adopt the LNG cold energy cascade utilization method of cold energy power generation, it comprises the following steps:
[0105] S1. Use LNG cold energy to generate electricity through direct expansion method, secondary media method or combined method;
[0106] S2. Using the cold energy of LNG after power generation to produce liquefied CO 2 and dry ice;
[0107] S3. Utilization is completed to produce liquefied CO 2 And LNG cold energy after dry ice for warehouse refrigeration.
[0108] ①Cold power generation
[0109] ex p =-197.7kJ / kg; ex c,s =31.9kJ / kg; ex c,l =282.1kJ / kg; ex=116.3kJ / kg
[0110] ② Preparation of liquefied CO 2 and dry ice
[0111] ex p =28.4kJ / kg; ex c,s =11.2kJ / kg; ex c,l =128.4kJ / kg; ex=168.0kJ / kg
[0112] ③Frozen warehouse
[0113] ex p =50.4kJ / kg; ex c,s =22.7kJ / kg; ex c,l =165.2kJ / kg; ex=238.3kJ / kg
[0114] EX=522.6kJ / kg
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