CN218544883U - LNG cold energy and industry waste heat utilization in coordination's cold-electricity cogeneration system - Google Patents
LNG cold energy and industry waste heat utilization in coordination's cold-electricity cogeneration system Download PDFInfo
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- CN218544883U CN218544883U CN202223047954.7U CN202223047954U CN218544883U CN 218544883 U CN218544883 U CN 218544883U CN 202223047954 U CN202223047954 U CN 202223047954U CN 218544883 U CN218544883 U CN 218544883U
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Abstract
The utility model relates to a cold and electricity cogeneration technology field, in particular to LNG cold energy and industry waste heat utilization in coordination's cold and electricity cogeneration system. The system comprises an LNG tank, an LNG pump, a condenser, a cold energy recoverer, a natural gas heater, a natural gas turbine, a propane pump, an evaporator, a propane heater and a propane turbine; after the liquefied natural gas in the LNG tank passes through the LNG pump, the condenser, the cold energy recoverer and the natural gas heater in sequence, the liquefied natural gas enters a natural gas turbine to be expanded and generate power; the propane gas sequentially passes through a condenser, a propane pump and an evaporator, enters a propane heater and then enters a propane turbine for expansion power generation; the heat sources of the natural gas heater and the propane heater are from exhaust gas of a factory or a thermal power plant, and the cold energy recoverer and the evaporator provide cold energy output. This scheme can make LNG cold energy and industry waste heat all obtain effective utilization, to the utilization ratio of lifting energy, reduces carbon and discharges and have the significance.
Description
Technical Field
The utility model relates to a cold and electricity cogeneration technology field, in particular to LNG cold energy and industry waste heat utilization in coordination's cold and electricity cogeneration system.
Background
Liquefied Natural Gas (LNG) is heated to normal temperature before use, and the low-temperature liquefied natural gas is converted into normal-temperature gas, and the gas is gasified by providing corresponding heat which can be from ambient air and water or from steam and fuel combustion. LNG regasification is a necessary link for natural gas to enter terminal consumption, and in the process, about 830kJ/kg of cold energy is released, but the cold energy is wasted in the gasification process.
Industrial waste heat is a low-grade energy source discharged by industrial process equipment in the production process, and comprises flue gas, waste water and the like. According to statistics, about 50% of industrial energy consumption in China is not utilized, but waste heat in various forms is directly wasted, for example, in the industries of power production, steel smelting and the like, medium and low temperature waste heat of about 100 ℃ generally exists, and the part of heat is directly discharged to the atmosphere, so that great energy loss is caused.
Therefore, a cogeneration system using LNG cold energy and industrial waste heat in cooperation is needed to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a LNG cold energy and industry waste heat utilization in coordination's cold-electricity cogeneration system can make LNG cold energy and industry waste heat all effectively utilized.
The embodiment of the utility model provides a cold-electricity cogeneration system of LNG cold energy and industrial waste heat utilization in coordination, including LNG jar, LNG pump, condenser, cold energy recoverer, natural gas heater, natural gas turbine, propane pump, evaporimeter, propane heater and propane turbine;
an outlet of the LNG tank is connected with an inlet of the LNG pump, an outlet of the LNG pump is connected with a cold strand inlet of the condenser, a cold strand outlet of the condenser is connected with a cold strand inlet of the cold energy recoverer, a cold strand outlet of the cold energy recoverer is connected with a cold strand inlet of the natural gas heater, and a cold strand outlet of the natural gas heater is connected with an inlet of the natural gas turbine;
an outlet of the propane turbine is connected with a hot strand inlet of the condenser, a hot strand outlet of the condenser is connected with an inlet of the propane pump, an outlet of the propane pump is connected with a cold strand inlet of the evaporator, a cold strand outlet of the evaporator is connected with a cold strand inlet of the propane heater, and a cold strand outlet of the propane heater is connected with an inlet of the propane turbine;
the liquefied natural gas in the LNG tank sequentially passes through the LNG pump, the condenser, the cold energy recoverer and the natural gas heater and then enters the natural gas turbine to be expanded and generated;
the propane gas sequentially passes through the condenser, the propane pump and the evaporator, then enters the propane heater, and then enters the propane turbine for expansion power generation; wherein the cold energy recoverer and the evaporator provide cold energy output.
The embodiment of the utility model provides a cold-electricity cogeneration system with LNG cold energy and industrial waste heat utilization, the liquefied natural gas in the LNG tank enters a natural gas turbine for expansion power generation after sequentially passing through an LNG pump, a condenser, a cold energy recoverer and a natural gas heater; propane gas discharged by the propane turbine enters a propane heater after passing through a condenser, a propane pump and an evaporator, and then enters the propane turbine for expansion power generation; the heat sources of the natural gas heater and the propane heater are discharged from a factory or a thermal power plant, the cold energy recoverer and the evaporator provide cold energy output, so that cold energy released in the LNG regasification process and medium-low temperature waste heat at about 100 ℃ are recycled, the energy utilization rate can be improved, the energy consumption of industrial enterprises can be reduced, and the energy investment and the operating cost can be saved.
Drawings
In order to clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the description below are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a cogeneration system with cooperative utilization of LNG cold energy and industrial waste heat provided by the embodiment of the present invention.
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments, based on the embodiments in the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a cogeneration system for cooperatively utilizing LNG cold energy and industrial waste heat, which includes an LNG tank 1, an LNG pump 2, a condenser 3, a cold energy recoverer 4, a natural gas heater 5, a natural gas turbine 6, a propane pump 7, an evaporator 8, a propane heater 9, and a propane turbine 10;
an outlet of the LNG tank 1 is connected with an inlet of the LNG pump 2, an outlet of the LNG pump 2 is connected with a cold strand inlet of the condenser 3, a cold strand outlet of the condenser 3 is connected with a cold strand inlet of the cold energy recoverer 4, a cold strand outlet of the cold energy recoverer 4 is connected with a cold strand inlet of the natural gas heater 5, and a cold strand outlet of the natural gas heater 5 is connected with an inlet of the natural gas turbine 6;
an outlet of the propane turbine 7 is connected with a hot strand inlet of the condenser 3, a hot strand outlet of the condenser 3 is connected with an inlet of the propane pump 7, an outlet of the propane pump 7 is connected with a cold strand inlet of the evaporator 8, a cold strand outlet of the evaporator 8 is connected with a cold strand inlet of the propane heater 9, and a cold strand outlet of the propane heater 9 is connected with an inlet of the propane turbine 10;
after passing through an LNG pump 2, a condenser 3, a cold energy recoverer 4 and a natural gas heater 5 in sequence, liquefied natural gas in an LNG tank 1 enters a natural gas turbine 6 to be expanded and generate power;
the propane gas sequentially passes through a condenser 3, a propane pump 7 and an evaporator 8, enters a propane heater 9 and then enters a propane turbine 10 for expansion power generation; the heat sources of the natural gas heater 5 and the propane heater 9 are from exhaust gas of a factory or a thermal power plant, and the cold energy recoverer 4 and the evaporator 8 provide cold energy output.
In the embodiment, liquefied natural gas in an LNG tank sequentially passes through an LNG pump, a condenser, a cold energy recoverer and a natural gas heater, and then enters a natural gas turbine for expansion power generation; propane gas discharged by the propane turbine enters a propane heater after passing through a condenser, a propane pump and an evaporator, and then enters the propane turbine for expansion power generation; the heat sources of the natural gas heater and the propane heater are discharged from a factory or a thermal power plant, the cold energy recoverer and the evaporator provide cold energy output, so that cold energy released in the LNG regasification process and medium-low temperature waste heat at about 100 ℃ are recycled, the energy utilization rate can be improved, the energy consumption of industrial enterprises can be reduced, and the energy investment and the operating cost can be saved.
During the regasification of the liquefied natural gas in the LNG power station, the pressurized liquefied natural gas in the LNG tank is used as a cold source to exchange heat with propane in a condenser, and the propane gas is condensed into liquid propane by using cold energy; the other part of the surplus cold energy is utilized in the cold energy recoverer, the heat source of the cold energy recoverer is glycol solution, and the temperature can be reduced from the normal temperature to about-20 ℃ after receiving the cold energy; the heat source of the evaporator is air, the temperature of the air at the outlet of the evaporator is about minus 10 ℃ to 0 ℃, and the evaporator can be applied to a refrigeration house or indoor refrigeration.
The above concept is described below by way of specific embodiments.
The system was designed to operate at 30 deg.C, 101.3kPa ambient conditions. The LNG transport pressure is 10MPa, and the upper limit of the design pressure of the high-pressure natural gas pipeline in China city is 4MPa as the outlet pressure of the natural gas turbine. The LNG mass flow rate was 4.35kg/s, and the propane mass flow rate was 4.38kg/s.
The method comprises the steps that 0.15MPa of liquefied natural gas in an LNG tank 1 is pressurized in an LNG pump 2, the pressure of the pressurized liquefied natural gas reaches 10MPa, the pressurized liquefied natural gas enters a condenser 3 to be exhausted to exchange heat with a propane turbine 10, the liquefied natural gas is gasified into natural gas, a part of LNG cold energy is recycled to condense the propane gas, then the liquefied natural gas enters a cold energy recoverer 4, surplus cold energy is transferred to an ethylene glycol solution with the mass fraction of 55%, the temperature of the ethylene glycol solution at 10 ℃ can be reduced to-20 ℃, then the natural gas enters a natural gas heater 5, the heat source of the natural gas heater 5 is 120 ℃ middle-low temperature waste heat, the natural gas enters a natural gas turbine 6 under the pressure of 10MPa after being heated to expand and generate power, and the exhaust pressure of the natural gas turbine 6 is 4MPa. The propane gas at the outlet of the propane turbine 10, which is at the temperature of 45 ℃ below zero and 0.056MPa, is condensed into liquid propane at the temperature of 55 ℃ below zero and 0.056MPa in a condenser 3, then the liquid propane enters a propane pump 7 to be pressurized to 0.3MPa, and then enters an evaporator 8 to exchange heat with air at the temperature of 30 ℃ and 0.101MPa, the hot outlet of the evaporator 8 is air at the temperature of 1 ℃ below zero and 0.101MPa, the cold outlet is propane gas at the temperature of 11 ℃ below zero and 0.3MPa, and the propane gas is heated by a propane heater 16 which takes middle and low temperature waste heat at the temperature of 120 ℃ as a heat source and then enters the propane turbine 10 to be expanded for power generation.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a" \8230; "does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (1)
1. A combined cooling and power generation system for cooperatively utilizing LNG cold energy and industrial waste heat is characterized by comprising an LNG tank, an LNG pump, a condenser, a cold energy recoverer, a natural gas heater, a natural gas turbine, a propane pump, an evaporator, a propane heater and a propane turbine;
an outlet of the LNG tank is connected with an inlet of the LNG pump, an outlet of the LNG pump is connected with a cold strand inlet of the condenser, a cold strand outlet of the condenser is connected with a cold strand inlet of the cold energy recoverer, a cold strand outlet of the cold energy recoverer is connected with a cold strand inlet of the natural gas heater, and a cold strand outlet of the natural gas heater is connected with an inlet of the natural gas turbine;
an outlet of the propane turbine is connected with a hot strand inlet of the condenser, a hot strand outlet of the condenser is connected with an inlet of the propane pump, an outlet of the propane pump is connected with a cold strand inlet of the evaporator, a cold strand outlet of the evaporator is connected with a cold strand inlet of the propane heater, and a cold strand outlet of the propane heater is connected with an inlet of the propane turbine;
the liquefied natural gas of the LNG tank sequentially passes through the LNG pump, the condenser, the cold energy recoverer and the natural gas heater and then enters the natural gas turbine to be expanded and generate power;
the propane gas sequentially passes through the condenser, the propane pump and the evaporator, then enters the propane heater, and then enters the propane turbine for expansion power generation; wherein the heat sources of the natural gas heater and the propane heater are from exhaust gas of a factory or a thermal power plant, and the cold energy recoverer and the evaporator provide cold energy output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223047954.7U CN218544883U (en) | 2022-11-16 | 2022-11-16 | LNG cold energy and industry waste heat utilization in coordination's cold-electricity cogeneration system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223047954.7U CN218544883U (en) | 2022-11-16 | 2022-11-16 | LNG cold energy and industry waste heat utilization in coordination's cold-electricity cogeneration system |
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| CN218544883U true CN218544883U (en) | 2023-02-28 |
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| CN202223047954.7U Active CN218544883U (en) | 2022-11-16 | 2022-11-16 | LNG cold energy and industry waste heat utilization in coordination's cold-electricity cogeneration system |
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| CN (1) | CN218544883U (en) |
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