A Method for Predicting and Measuring Ice Layer in Heat Transfer Tubes of Submerged Combustion Gasifier

Abstract

The present invention proposes a method for predicting and measuring the ice layer of the heat transfer tube of the submerged combustion gasifier. Firstly, the numerical calculation model of the LNG heat transfer tube is constructed, and the UDF is compiled during the numerical calculation process to obtain the corresponding ice layer thermal resistance added in On the outer wall of LNG, the fluid-solid coupling numerical calculations inside and outside the LNG heat transfer tube are carried out, and the location of ice formation is predicted according to the numerical calculation results. Secondly, using the ice layer information obtained by numerical calculation as a reference, an icing measurement device is installed in the suspected icing area of ​​the SCV heat transfer tube. The icing measurement device is embedded with a thermocouple to measure the temperature at the outer wall of the heat transfer tube. To obtain the temperature difference between the outer wall of the heat transfer tube and the inner wall of the ice layer, and then calculate the corresponding thickness of the ice layer according to the basic heat transfer equation, so as to obtain the freezing position and thickness of the heat transfer tube, and then use it to evaluate the exchange between LNG and the water bath. thermal performance.

Description

A method for predicting and measuring ice layer in heat transfer tube of submerged combustion gasifier technical field The invention belongs to the technical field of LNG gasifier, and relates to a kind of heat transfer tube ice layer for submerged combustion type gasifier Prediction and measurement methods. Background technique Submerged combustion vaporizer (Submerged Combustion Vaporizer, referred to as SCV) is a submerged combustion The multiphase flow heat exchange device developed on the basis of technology is used to realize liquefied natural gas (Liquefied Natural Gas, simplified The controllable conversion of LNG) to natural gas (NG for short) has the advantages of rapid start-up, high thermal efficiency and power regulation range. It has the characteristics of wide enclosure, compact volume, and low investment cost of equipment at one time. Due to seasonal fluctuations in natural gas demand, winter is often Therefore, the SCV is often used as a special p...

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Problems solved by technology

[0004] In order to overcome the fact that the existing SCV heat transfer tubes freeze during operation, and under the interference of the "turbulence" of the "pseudo-static" water bath, the location and thickness of the ice layer cannot be directly observed, which makes it difficult to predict the heat transfer performance between LNG and the water bath Problem, the present invention proposes a method and device for predicting and measuring the ice layer of the heat transfer tube of the submerged combustion gasifier

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