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Deep microwave drying method for metal storage tank

A drying method and storage tank technology, which are applied in the directions of drying solid materials, drying gas arrangement, heating to dry solid materials, etc., can solve the problems of large quantity demand, scrapped storage tanks, complicated structure, etc., and achieve the effect of convenient operation.

Inactive Publication Date: 2017-06-20
NANJING MCRWAVE TECH CO LTD
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  • Claims
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AI Technical Summary

Problems solved by technology

If liquid nitrogen is used for drying, the quantity demand is also very large, and the temperature is lower after liquid nitrogen is vaporized, so long-term drying is unavoidable
[0005] Taking a large LNG storage tank as an example, it has a large volume and a complex structure. The drying and nitrogen replacement process of the storage tank generally takes a long time, and special attention must be paid to the fluctuation of the tank pressure during the entire drying and nitrogen replacement process. Improper operation may cause large pressure fluctuations in the storage tank, which may cause deformation of the storage tank and affect the normal and safe use of the storage tank. If the deformation of the storage tank is too large, the storage tank may be completely scrapped, and the achievements of several years of hard work will be in vain. , there is a purging method to avoid pressure fluctuations, which is a topic worth studying

Method used

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  • Deep microwave drying method for metal storage tank

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Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1 (traditional purging)

[0025] A low-temperature propylene storage tank with a total volume of 21,200m3 must be dried after the hydrostatic test before being put into operation, and the dew point must be ≤ -40°C. The method of purging with dry nitrogen is used for continuous purging and drying. The actual operation takes nearly 52 hours to meet the technical requirements, and the use of nitrogen is 70000Nm3 (about 87.5 tons).

experiment example 2

[0026] Experimental example 2 (method of the present invention)

[0027] A small steel container with a diameter of 1.2 meters and a height of 1.5 meters is used for the test.

[0028] The first step is to fully spray water on the inner wall of the container, and then blow it with absolutely dry compressed air. The Celsius water analyzer, blowing air flow rate is 1.5 cubic meters per minute, and the dew point is reduced from 15 degrees to -30 degrees for 167 minutes.

[0029] In the second step, after fully spraying water on the inner wall of the container, blow it with absolutely dry compressed air. For the water analyzer in Celsius, a microwave feeding port is opened on the side of the container near the bottom. The microwave uses 2450MHz microwave power of 1000 watts, and a microwave uniform distributor is installed. The blowing flow rate is also 1.5 cubic meters per minute, and the dew point has dropped from 15 degrees to -30 degrees, and it has been used for 73 minutes....

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Abstract

In the microwave deep drying method for metal storage tanks described in the present invention, microwaves are fed into the metal storage tank through the microwave generation and control device, and a microwave uniform distributor is added to make the cavity inside the metal storage tank form a microwave resonant cavity. Microwaves of different modes resonate in this cavity, and the water adsorbed on the inner wall and dead corner of the metal storage tank will absorb the microwave energy, move rapidly, collide, and rub against each other. When the water molecules have enough kinetic energy, they will get rid of the adsorption effect of the tank wall , so as to diffuse into the space, and then these water molecules are taken out by the drying gas. Not only can achieve deep drying, but also greatly reduce the drying time and save energy. Moreover, the pressure is stable throughout the process and will not deform the storage tank.

Description

technical field [0001] The invention belongs to the technical field of chemical equipment purging, and in particular relates to a microwave deep drying method for metal storage tanks. Background technique [0002] In the chemical and petrochemical industries, there are many storage tank systems that strictly prohibit residual moisture, (such as: LNG storage tanks, propylene storage tanks, ethylene storage tanks, etc.), these moisture is usually adsorbed on the inner surface of the storage tank, even a very small amount of water It can also cause process failure, unqualified product quality, and lead to major safety accidents. For example, a small amount of moisture can accelerate the corrosion of storage tank equipment, block valves, reduce gas delivery efficiency, and cause compressor damage. [0003] According to the requirements of the specification, petrochemical storage tanks must undergo corresponding tests after construction to check the construction quality (mainly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B21/00F26B23/08F26B3/347F26B25/00
CPCF26B21/00F26B3/347F26B23/04F26B25/00
Inventor 公维生王锦勇王英军邹俊良
Owner NANJING MCRWAVE TECH CO LTD
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