A device and method for demisting and ice-making by utilizing the cold energy of liquefied natural gas

A technology of liquefied natural gas and cold energy, applied in the direction of ice making, ice making, application, etc., can solve the problems of difficult to obtain good economic benefits, unreasonable use of equipment, high maintenance and operation costs, and achieve safe and reliable cold energy recovery process , Eliminate cold pollution, reduce the effect of cold pollution

Inactive Publication Date: 2015-09-23
GUANGZHOU HUAFENG ENERGY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] On the other hand, if the gasification capacity of the LNG gasification station is limited and the equipment cannot be used reasonably, it will lead to high equipment costs and high maintenance and operation costs for the cascade utilization of LNG cold energy. investment recovery

Method used

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  • A device and method for demisting and ice-making by utilizing the cold energy of liquefied natural gas
  • A device and method for demisting and ice-making by utilizing the cold energy of liquefied natural gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] An ice machine with an ice-making capacity of 100 tons / day is used as the terminal equipment for LNG cold energy release, and the gasification capacity of LNG is 9000m 3 / h, its cold release can just meet the demand of 100 tons of ice production per day. However, according to the statistics of the actual operation of the gasification station, the gasification volume of LNG is 9000-20000Nm 3 In the / h stage, the cooling capacity released by gasification is greater than the cooling capacity required to make 100 tons of ice. Therefore, by removing the cooling water in the ice machine, the excess cooling capacity other than ice production is released in time to ensure that the cooling capacity is reduced at the peak of gasification. The effect of fog.

[0029] -162℃, 5000m 3 The liquefied natural gas per hour is gasified by the gasifier, and then becomes normal temperature natural gas and enters the natural gas pipeline network. The visibility in the gasification station...

Embodiment 2

[0032] -162℃, 8750m 3 The liquefied natural gas per hour is gasified by the gasifier, and then becomes normal temperature natural gas and enters the natural gas pipeline network. The visibility in the gasification station was less than 8m in 60 minutes, and the staff could operate it. The cold fog spread to the surrounding residential areas, reducing the ambient temperature; the cold fog spread to the surrounding roads, and the visibility gradually decreased, affecting traffic.

[0033] -162℃, 0.4MPa, 8750m from LNG storage tank 1 3 The LNG per hour exchanges heat with the first heat exchanger 2, and the temperature drops to -32.1°C, then enters the newly added second gasifier 3, and is transported to the downstream natural gas pipeline network. After exchanging heat in the first heat exchanger 2, the gas phase R404A at -25°C and LNG becomes a low-temperature liquid phase at -32.2°C and 0.2 MPa, with a flow rate of 25.5t / h, and flows into the liquid-phase low-temperature refr...

Embodiment 3

[0035] -161℃, 12500m 3 The liquefied natural gas per hour is gasified by the gasifier, and then becomes normal temperature natural gas and enters the natural gas pipeline network. The visibility in the gasification station was less than 6m in 60 minutes, and the staff could barely operate. The cold fog spread to the surrounding residential areas, reducing the ambient temperature; the cold fog spread to the surrounding roads, greatly reducing visibility and seriously affecting traffic.

[0036] -161℃, 0.4MPa, 12500m from LNG storage tank 1 3 The LNG per hour exchanges heat with the first heat exchanger 2, and the temperature drops to -45.9°C, then enters the newly added second gasifier 3, and is transported to the downstream natural gas pipeline network. The gaseous R404A at -23°C exchanges heat with LNG in the first heat exchanger 2, and then turns into a low-temperature liquid phase at -35°C and 0.2 MPa, with a flow rate of 34.5t / h, and flows into the liquid-phase low-temper...

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Abstract

The invention discloses a demisting and ice-making apparatus and a method using liquefied natural gas cold energy. A liquefied natural gas storage tank of the apparatus is connected with a first heat exchanger by pipeline, and a first heat exchanger is connected by a pipeline gasifier; the first heat exchanger is also respectively connected with a liquid phase low temperature refrigerant storage tank and a gas phase refrigerant storage tank; the liquid phase low temperature refrigerant storage tank is connected with a first centrifugal pump, and the first centrifugal pump is connected with a second heat exchanger by pipeline, and the second heat exchanger is connected with a gas phase refrigerant storage tank by pipeline; the second heat exchanger is also respectively connected with an ice-making machine and a second centrifugal pump by pipeline, and the second centrifugal pump is connected with a glycol storage tank, and the glycol storage tank is connected with the ice-making machine, and the ice-making machine is connected with a water supply line. Two refrigerant circulating systems are designed according to the invention, and the LNG cold energy is used for ice-making, and ice-making quantity and quality are changed according to the invention, thereby saving ice-making and selling power, producing a certain economic benefit, realizing the purpose of energy saving and emission reduction, and clipping peak, demisting and reducing cold pollution in the LNG gasification process.

Description

technical field [0001] The invention relates to ice making technology, in particular to a device and method for making ice by utilizing the cold energy of liquefied natural gas for demisting. Background technique [0002] Natural gas is a clean, high-quality, and efficient energy source. At present, all countries are vigorously developing natural gas to replace the shortage of oil resources. At present, the global LNG trade volume exceeds 1×10 8 t, and continues to grow. At the LNG receiving station, LNG is generally used after being gasified through a gasifier, and a large amount of cold energy will be released during gasification, with a value of 830kJ / kg. If the cold energy of LNG can be effectively recovered and utilized, energy can be saved, pollution in the vaporization process of LNG can be reduced, the price of gas supply in the downstream market can be lowered, and the economic benefits of natural gas can be improved. Currently, there are 38 LNG receiving station...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25C1/00
CPCY02P60/85
Inventor 徐文东张辉彭国辉石磊李敬江刘铭炎张青
Owner GUANGZHOU HUAFENG ENERGY TECH
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