CN218599454U - Complementary distributed energy system of multipotency of LNG receiving station - Google Patents

Abstract

The utility model discloses a complementary distributed energy system of LNG receiving station multipotency. The system comprises a BOG re-condensation system, a waste heat recovery system and a solar energy composite refrigeration system, wherein the BOG re-condensation system comprises an LNG transport ship, an LNG storage tank, a booster pump, a compressor, a heat exchanger, a condenser and a gasifier; the waste heat recovery system comprises a gas internal combustion engine, a booster pump, a heat exchanger, a waste heat boiler and a steam turbine; the solar composite refrigeration system comprises a heat storage water tank, a booster pump, a heat exchanger, a heat collector, an absorption subsystem, a compression subsystem, a subcooler and a coordination controller. The utility model discloses can utilize in the LNG storage tank evaporation gas to realize the station in power supply self-supporting, it is self-supporting to utilize high temperature cylinder liner water and flue gas waste heat to realize the station in heat supply, utilizes solar energy and high temperature cylinder liner water and flue gas waste heat to realize the station in cooling self-supporting, greatly reduces LNG receiving station operation cost, and the coordinated controller that is equipped with simultaneously still can deal with the influence of natural factor.

Description

Complementary distributed energy system of multipotency of LNG receiving station

Technical Field

The utility model relates to a complementary distributed energy system of LNG receiving station multipotency.

Background

The liquefied natural gas has the advantages of small combustion pollution, high heat productivity, convenience in transportation and the like, is an important energy form in China, and the demand of China on the aspect of liquefied petroleum gas is increased year by year. In order to meet the energy demand, china not only strengthens the cooperation with surrounding countries and ensures the stable supply of liquefied natural gas, but also constructs a large number of LNG receiving stations, and the construction level of the LNG receiving stations is directly related to the safety of the liquefied natural gas in the storage and transportation links. In the process of building the LNG receiving station, through strengthening the application of the novel energy-saving technology, redundant energy in the station can be fully and effectively recovered, and then the energy consumption of the LNG receiving station in production operation is reduced.

The distributed energy system with multi-energy complementation can utilize an internal controllable energy supply unit to enable traditional energy and new energy to be combined with each other, and cold, heat and electricity combined supply is realized nearby a load side center. The method not only makes up the defect of uncertainty in acquisition of new energy such as solar energy, wind energy and the like, but also reduces resource waste caused by wind abandonment and light abandonment, and meets the requirements of users on environment-friendly energy utilization systems. The combination of the construction of the LNG receiving station and the concept of the distributed energy system with multi-energy complementation is a new direction of current research.

The utility model discloses combine solar energy composite refrigeration technique, gas internal-combustion engine waste heat utilization technique and the complementary distributed energy system theory of multipotency, provide and can be used for the natural gas distributed energy system of refrigeration, heating, power supply in the station with Boil Off Gas (BOG) of LNG storage tank, can reduce LNG receiving station operation cost, integrate into the sustainable development theory of the low carbon green energy among the construction of natural gas station field.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at constructs the complementary distributed energy system of multipotency that can fuse gas internal-combustion engine waste heat technique and the compound refrigeration technology of solar energy in the LNG receiving station, reduces LNG receiving station operation cost.

In order to achieve the above object, the main technical solution of the present invention is to provide a multi-energy complementary distributed energy system for an LNG receiving station, which comprises a BOG recondensing system, a waste heat recovery system, and a solar composite refrigeration system, wherein the BOG recondensing system comprises an LNG carrier, an LNG storage tank, a booster pump, a compressor, a heat exchanger, a condenser, and a vaporizer; the waste heat recovery system comprises a gas internal combustion engine, a booster pump, a heat exchanger, a waste heat boiler and a steam turbine; the solar composite refrigeration system comprises a heat storage water tank, a booster pump, a heat exchanger, a heat collector, an absorption subsystem, a compression subsystem, a subcooler and a coordination controller.

Further, the absorption subsystem comprises a generator, a condenser, an evaporator and an absorber; the compression subsystem comprises a subcooler, a condenser, a compressor, an evaporator and a throttle valve.

Furthermore, an inlet of the gas internal combustion engine is connected with a BOG discharge pipe of the LNG storage tank, a high-temperature cylinder sleeve water outlet pipeline port of the gas internal combustion engine is connected with a shell side of the heat exchanger, a flue gas discharge pipe of the gas internal combustion engine is connected with the shell side of the heat exchanger, and a power generation circuit of the gas internal combustion engine is connected to an in-station power grid.

Furthermore, an inlet of the waste heat boiler is connected with a flue gas exhaust pipe of the gas turbine, and a steam exhaust pipe of the waste heat boiler is connected with an inlet of the steam turbine.

Furthermore, in the solar refrigeration system, a water inlet of a heat storage water tank is respectively connected with an outlet of a booster pump of the solar heating circulating water pipeline and a water outlet of a generator of the circulating water pipeline of the absorption subsystem, and a water outlet of the heat storage water tank is respectively connected with an inlet of a heat collector of the solar heating circulating water pipeline and an inlet of a booster pump of the circulating water pipeline of the absorption subsystem; in the waste heat recovery system, a water inlet of a heat storage water tank is connected with an outlet of a booster pump, and a water outlet of the heat storage water tank is connected with a tube side of a heat exchanger.

Furthermore, in the absorption subsystem, an inlet of an evaporator is connected with an outlet of a booster pump, a water outlet pipe of a condenser is connected with an in-station hot water pipe network, and the evaporator and a subcooler of the absorption subsystem are connected through a circulating water pipeline; in the compression subsystem, an evaporator outlet is arranged in places such as a machine room and a dormitory, and a condenser water outlet is connected to an indoor hot water pipe network.

Furthermore, the coordination controller is connected with a booster pump of the solar heating circulating water pipeline and a booster pump in the waste heat recovery system, so that the booster pump of the waste heat recovery system is automatically started to adapt to the influence of weather change when the solar illumination is short and the heating of the heat storage water tank cannot be met.

The utility model has the positive effects that: the LNG storage tank is used for evaporating gas to achieve self-supply of power in the station, high-temperature cylinder sleeve water and flue gas waste heat are used for achieving self-supply of heat in the station, solar energy and the high-temperature cylinder sleeve water and flue gas waste heat are used for achieving self-supply of cold in the station, the operation cost of the LNG receiving station is greatly reduced, the LNG receiving station is low-carbon, efficient, green and energy-saving, a coordination controller which is equipped with the LNG storage tank can also cope with the influence of natural factors, and the LNG receiving station is safe, reliable and high in innovation.

Drawings

Fig. 1 is a schematic structural diagram of a multi-energy complementary distributed energy system of an LNG receiving station according to an embodiment of the present invention.

Description of the reference numerals: s1 is an LNG transport ship, V1 is an LNG storage tank, P1-P7 are booster pumps, E1-E4 are heat exchangers, C1 is a compressor, A1 is a condenser, G1 is a gasifier, I1 is a gas internal combustion engine, B1 is a waste heat boiler, T1 is a steam turbine, W1 is a heat storage water tank, H1 is a heat collector, K1 is an absorption subsystem, K2 is a compression subsystem, J1 is a subcooler, and M1 is a coordination controller.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.

Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. The features in the embodiments described below may be combined with each other without conflict.

Fig. 1 is a schematic structural diagram of a complementary distributed energy system of multiple energy of an LNG receiving station according to an embodiment of the present invention.

As shown in fig. 1, the present embodiment provides a multi-energy complementary distributed energy system for an LNG receiving station, which includes a BOG recondensing system, a waste heat recovery system, and a solar hybrid refrigeration system.

The BOG recondensing system comprises an LNG transport ship S1, an LNG storage tank V1, booster pumps P1-P3, a heat exchanger E2, a compressor C1, a condenser A1 and a gasifier G1; the waste heat recovery system comprises a gas internal combustion engine I1, a waste heat boiler B1, a steam turbine T1, a heat exchanger E3, a heat exchanger E4, a booster pump P4 and a booster pump P5; the solar composite refrigeration system comprises a heat storage water tank W1, a heat collector H1, an absorption subsystem K1, a compression subsystem K2, a subcooler J1, a coordination controller M1, a booster pump P6 and a booster pump P7.

In LNG transport ship S1 passes through the LNG storage tank V1 of unloading arm with the LNG receiving station, the partly BOG that the storage tank produced steps up the back through compressor C1, in the heat exchanger with the indirect heat transfer of LNG that is drawn forth by booster pump P1 and P2, then get into condenser A1 liquefaction, get into low pressure LNG pipeline system, after booster pump P3 pressure boost to the outer defeated pressure with high temperature cylinder liner water heat transfer, absorb partial heat, and then reduce the vaporizer load, get into the outer defeated pipe network of importing after the vaporizer gasification at last.

The other part of BOG generated by the LNG storage tank V1 enters the gas internal combustion engine I1 to do work for power generation, daily power consumption requirements in a station are met, backwater in the heat storage water tank W1 absorbs heat energy of high-temperature cylinder liner water generated by the gas internal combustion engine I1 in the heat exchanger E3, then heat energy of high-temperature flue gas generated by the gas internal combustion engine I1 is absorbed in the heat exchanger E4 and returns to the heat storage water tank through the booster pump P4, the high-temperature cylinder liner water generated after power generation of the gas internal combustion engine I1 is cooled through the heat exchanger E3 and then is conveyed to the heat exchanger E1 through the booster pump P5 to absorb cold energy of LNG to be cooled again, then the cold energy returns to the gas internal combustion engine I1, the high-temperature flue gas generated after power generation of the gas internal combustion engine I1 enters the waste heat boiler B1 after heat exchange and cooling through the heat exchanger E4, and generated steam enters a main steam port and a steam supplementing port of a steam turbine to do work for power generation, and daily power generation in the station is met.

The gas engine can be replaced by a gas turbine, but a high-temperature cylinder sleeve water waste heat utilization loop needs to be cancelled correspondingly; the type of power generation equipment is usually selected according to the correspondence between the demand-side thermoelectric ratio and the supply-side thermoelectric ratio, and it is preferable to use a gas turbine for the high demand-side thermoelectric ratio and a gas internal combustion engine for the low demand-side thermoelectric ratio.

Water in a heat storage water tank W1 enters a heat collector H1 under the power provided by a booster pump P6, the water is heated under the action of solar radiation and then enters the heat storage water tank W1, when the temperature of the top layer reaches the starting temperature of an absorption subsystem, the booster pump P7 starts to operate, hot water enters an absorption subsystem K1, then cold energy generated by the absorption subsystem is used for supercooling a refrigerant at the outlet of a condenser in a compression subsystem K2 through a subcooler J1, so that enthalpy in an evaporator is increased, further the power consumption of a compressor is saved, the compression subsystem K2 is used for cooling places such as an in-station machine room, an office building and the like, hot cooling water generated in the absorption subsystem K1 and the compression subsystem K2 is used for in-station heat supply and heating, and when the temperature of the heat storage water tank does not reach the standard due to insufficient sunlight or the influence of other weather factors, a coordinating controller M1 starts a P4 which is in a shutdown state under the ordinary condition, and heats the heat storage water tank to the designated temperature.

The absorption subsystem K1 is a single-effect lithium bromide absorption refrigeration system and consists of a generator, an absorber, a condenser, an evaporator and a solution heat exchanger; the compression subsystem K2 is a traditional vapor compression refrigeration system and consists of a subcooler, a condenser, a compressor and an evaporator, and the refrigerant is R717 (liquid ammonia); the heat collector can be a vacuum tube (ETC) heat collector.

Claims (3)

1. The utility model provides a complementary distributed energy system of LNG receiving station multipotency which characterized in that, includes BOG recondensing system, waste heat recovery system and the compound refrigerating system of solar energy:

the BOG re-condensation system comprises an LNG transport ship, an LNG storage tank, a booster pump, a compressor, a heat exchanger, a condenser and a gasifier;

the waste heat recovery system comprises a gas internal combustion engine, a booster pump, a heat exchanger, a waste heat boiler and a steam turbine;

the solar composite refrigeration system comprises a heat storage water tank, a booster pump, a heat exchanger, a heat collector, an absorption subsystem, a compression subsystem, a subcooler and a coordination controller;

the inlet of the gas internal combustion engine is connected with a BOG discharge pipe of the LNG storage tank, the mouth of a high-temperature cylinder sleeve water outlet pipeline of the gas internal combustion engine is connected with a tube side of a heat exchanger, a flue gas exhaust pipe of the gas internal combustion engine is connected with a shell side of the heat exchanger, a power generation circuit of the gas internal combustion engine is connected to an in-station power grid, the water inlet of the heat storage water tank is respectively connected with the outlet of a booster pump of the solar heating circulating water pipeline and the water outlet of a generator of the circulating water pipeline of the absorption subsystem, and the water outlet of the heat storage water tank is respectively connected with the inlet of a heat collector of the solar heating circulating water pipeline and the inlet of a booster pump of the circulating water pipeline of the absorption subsystem.

2. The LNG receiving station multi-energy complementary distributed energy system of claim 1, wherein: in the absorption subsystem, an inlet of an evaporator is connected with an outlet of a booster pump, a water outlet pipe of a condenser is connected with an in-station hot water pipe network, and the evaporator and a subcooler of the absorption subsystem are connected through a circulating water pipeline; in the compression subsystem, an evaporator outlet is arranged in a machine room or a dormitory, and a condenser water outlet is connected to an indoor hot water pipe network.

3. The LNG receiving station multi-energy complementary distributed energy system of claim 1, wherein: the coordination controller is connected with a booster pump of the solar heating circulating water pipeline and a booster pump in the waste heat recovery system, the solar illumination time is short, and when the heating of the heat storage water tank cannot be met, the booster pump of the waste heat recovery system is automatically started to adapt to the influence of weather change.

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