Anti-solidification large-temperature-difference LNG cold energy recovery heat exchanger

Abstract

The invention discloses an anti-solidification large-temperature-difference LNG cold energy recovery heat exchanger. The recovery heat exchanger comprises a heat exchanger cavity, an intermediate medium is injected into the cavity, the upper portion of the cavity is an intermediate medium gas phase area, the lower portion of the cavity is an intermediate medium liquid phase area, an LNG coil pipe and an NG coil pipe are arranged in the gas phase area, and a heating medium coil pipe is arranged in the liquid phase area; a baffle is arranged on the upper portion of the heat exchanger and divides the upper portion of the heat exchanger into an LNG heating area and an NG heating area, the tops of the LNG heating area and the NG heating area are communicated, an LNG coil pipe is arranged in the LNG heating area, an NG coil pipe is arranged in the NG heating area, and the top of the LNG coil pipe is in communication with the bottom of the NG coil pipe; and a heat insulation baffle is arranged on the lower portion of the heat exchanger cavity and connected to a baffle, the lower portion of the heat exchanger is divided into a mixed preheating area and an evaporation area through the heat insulation baffle, the two areas are communicated at the bottom, a low-temperature heating medium coil is arranged in the mixed preheating area, and a high-temperature heating medium coil is arranged in the evaporation area. According to the recovery heat exchanger, solidification-free efficient recycling of LNG cold energy under the large temperature difference can be achieved, and a secondary refrigerant needed by ice making or air conditioning and the like can be directly prepared.

Description

technical field [0001] The invention belongs to the technical field of LNG cold energy recovery, in particular to an ultra-low temperature large temperature difference anti-solidification LNG cold energy recovery heat exchanger. Background technique [0002] The temperature of liquefied natural gas (abbreviated as LNG) is about -162°C, and it is natural gas that exists in liquid form. Usually, LNG needs to be re-gasified into gaseous natural gas (referred to as NG) before it can be used. Therefore, LNG receiving stations often use air-temperature gasification The device releases this part of the cold energy into the air, which not only wastes a lot of cold energy in vain, but also causes cold pollution to the environment; the cold energy released during LNG gasification is about 840kJ / kg, so the contained cold energy is very huge With the in-depth promotion of my country's energy-saving and emission-reduction policies, more and more attention has been paid to the recycling of ...

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Problems solved by technology

This not only leads to high initial investment, large loss of cooling capacity, large floor space, but also low heat transfer efficiency and high operating costs.

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