LNG receiving station energy saving new process and energy saving system

An energy-saving system and receiving station technology, applied in the direction of steam engine devices, gas turbine devices, machines/engines, etc., can solve the problems of power consumption and cold energy throwing away, so as to save power consumption, save maintenance costs, and improve economic benefits Effect

Pending Publication Date: 2019-11-29
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AI-Extracted Technical Summary

Problems solved by technology

Not only is the cold energy we bought with money thrown ...
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Method used

2) The power generation links of the triple combination are put into the receiving station process, the first stage is to utilize the evaporated gas of LNG to generate electricity, which reduces the energy consumption cost of receiving station to process the evaporated gas, and changes the consumption into value-added, and the gas-fired power generation The waste heat heats water to generate high-pressure steam; the second stage is to use high-pressure steam to drive the steam turbine to generate electricity; the third stage, the steam after steam power generation is used as the heat source of the evaporator for cold power generation, and the remaining heat is sent to the vaporizer, and the heat is multi-stage Utilization improves the energy utilization rate of natural gas.
[0109] 3) Put cold energy power generation in...
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The invention provides a LNG receiving station energy saving new process; and the new process changes an idea of only using natural gas as goods for reception, storage and conveying in a LNG receivingstation traditional process, but uses the natural gas as a LNG energy receiving station for comprehensively receiving and conveying LNG energy, including cold energy carried by LNG. The new process changes a traditional gasifying process, cancels all seawater heat exchange equipment facilities, and feeds no cold energy into the sea. An IFV intermediate gasifier set is used for replacing an ORV open shelf type seawater gasifier set; and LNG cold energy is collected by intermediate mediums and conveyed to each cold energy utilization project. The invention further provides a LNG evaporation gastreatment system. Evaporation gas is used for triple power generation; and power generation afterheat is used for LNG gasifiers. New paths are developed for energy conservation, consumption reductionand benefit increment of receiving stations.

Application Domain

Gas turbine plantsSteam engine plants

Technology Topic

SeawaterProcess engineering +5


  • LNG receiving station energy saving new process and energy saving system
  • LNG receiving station energy saving new process and energy saving system
  • LNG receiving station energy saving new process and energy saving system


  • Experimental program(1)
  • Comparison scheme(1)

Example Embodiment

[0115] Instance
[0116] Take Huaying Chaozhou LNG receiving terminal as an example,
[0117] The receiving capacity of the station is 6 million tons of LNG per year. The receiving station is designed with 7 LNG storage tanks, each with 200,000 cubic meters.
[0118] The in-tank pump pumps LNG out of the tank, and the LNG is transported to the gasification zone through the high-pressure pump, and then enters the intermediate vaporizer IFV, where it exchanges heat with the intermediate medium. (The intermediate medium can be selected according to the specific needs of the cold energy utilization project ) The heat exchange makes the LNG gasify, after being collected, the calorific value, dyeing and metering are adjusted, and then transported to the high-pressure pipe network for supply to users. And IFV transfers cold energy to industrial projects for cold energy utilization through an intermediate medium for use.
[0119] Before reaching the IFV, a part of LNG will pass through cooler 1 to cool the nitrogen to -150~-140℃. The nitrogen is used as the working medium to transfer the cold energy to the cold energy air separation station, cool the air, and then carry out cryogenic separation of the air. . After passing through cooler 1, LNG enters IFV for gasification.
[0120] The boil-off gas is sent to the gas-fired power generation unit through a pipeline, and another pipeline sends part of the gasified natural gas to the gas-fired power generation unit. When the amount of vaporized gas is insufficient, the automatic control system and the controllable valve adjust the natural gas to supplement it to meet the needs of gas-fired power generation. The gas is mixed with air and burned in the combustion chamber. The rapidly expanding gas drives the gas turbine to generate electricity. A 50MW gas generator is installed in the first phase, and the efficiency of gas turbine power generation is 28%. In order to make full use of the waste heat of the gas, an industrial water evaporator (boiler) is installed behind the gas turbine. The high-temperature exhaust gas after combustion heats industrial water into high-pressure steam (about 600°C).
[0121] High-pressure steam at 600°C is sent to the steam power generation unit to drive the steam turbine to generate electricity. The power generation capacity of the steam turbine is about 1/4 of that of gas-fired power generation. However, it is the two reuses that increase the power generation efficiency to 57%. The steam after the steam turbine is pushed, the pressure drops and the temperature decreases (about 200°C) to become low-pressure steam from the steam turbine and preheat the industrial water.
[0122] The low-pressure steam after steam power generation continues to be sent to the cold energy power generation unit, enters the evaporator, exchanges heat with the working medium into warm water (about 60°C), and flows out of the evaporator. It is sent to the next level of utilization (warm water waste heat vaporizer). The industrial medium (selected as the mixed medium of ethane) is gasified by low-pressure steam in the evaporator and rapidly expands to drive the turbine to generate electricity. Then it enters the condenser, is cooled by LNG and becomes liquid, and then sent back to the evaporator, cyclically, continuously generating electricity. The cold power generation capacity is 8MW, which can meet 1/3 of the power consumption of the receiving station.
[0123] After the cold power generation, the low-pressure steam becomes warm water, and the warm water is used as an LNG vaporizer, that is, a warm water waste heat vaporizer, to vaporize the LNG from the cold energy power generation unit.
[0124] In addition, the low pressure steam from the steam power generation unit goes to the emergency vaporizer along another branch. Gasification of LNG. After passing through the emergency vaporizer, the low-pressure steam becomes cold water and returns to the industrial water tank for recycling.
[0125] In the whole process, the boil-off gas no longer passes through the compressor and the recondenser, and is no longer reliquefied, thus saving the electric energy consumed by the reliquefaction. The torch is usually closed, and no longer emits and burns to the air, unless an accident is dealt with. However, the new process still retains the recondenser and torch, so that when the triple power unit is overhauled, it can still handle the boil-off gas.


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Description & Claims & Application Information

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