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A kind of ammonia drying device and drying method based on temperature swing adsorption

A temperature swing adsorption and drying device technology, applied in chemical instruments and methods, separation methods, ammonia compounds, etc., can solve problems such as fluctuations in water content and inability to meet quality requirements, and achieve the effect of reducing energy consumption

Active Publication Date: 2021-08-17
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional AB tower drying device, the temperature of the adsorbent rises rapidly within 4-5 hours after the working tower is switched to the adsorption step. During this period, the water content of the ammonia gas at the outlet may rise to more than 35ppm. After the drop, the water content of the gas outlet can be restored again, and there will be periodic (currently about 30 hours) water content fluctuations, which cannot meet the quality requirements of the user's continuous production

Method used

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  • A kind of ammonia drying device and drying method based on temperature swing adsorption
  • A kind of ammonia drying device and drying method based on temperature swing adsorption
  • A kind of ammonia drying device and drying method based on temperature swing adsorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The ammonia gas purification unit for a certain strip steel production unit purchases raw material liquid ammonia as a superior product with an impurity content of less than 0.1%. The intermediate product ammonia gas produced after gasification by a water-bath gasifier and distillation with 7°C cooling water has a water content of Usually at the 80-160ppm level.

[0050] The ammonia gas inlet port (1) is connected with the intermediate product ammonia gas, and the product ammonia gas pressure is 0.2-0.4MPa. The ammonia gas outlet port (2) is connected to the ammonia gas user after being connected to the product ammonia gas buffer tank. The regeneration gas inlet port (3) is connected to the factory nitrogen pipeline, and the pressure of the nitrogen pipeline network is 0.2-0.7MPa. The tail gas exhaust port (4) is connected with the ammonia release tank of the factory tail gas treatment device, and the working pressure of the ammonia release tank is about 10kPa. The ad...

Embodiment 2

[0055] The raw material ammonia is a first-class product, and its impurity content is less than 0.2%. The water content of the intermediate product ammonia gas after gasification and distillation is usually in the range of 150-360ppm, and the water content fluctuates even more during a period of time after each liquid ammonia storage tank is filled.

[0056] Others are the same as embodiment 1.

[0057] The device and method shown in the examples are used to process the intermediate product ammonia, and the American Tiger Optics HALOLP water analyzer is used to conduct online detection of the ammonia water content of the product. The ammonia water content of the product is stably controlled below 5ppm, which fully meets the needs of ammonia users. Requirements.

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Abstract

The invention provides an ammonia gas drying device based on temperature swing adsorption, comprising the ammonia gas inlet port (1), the ammonia gas outlet port (2), the regeneration gas inlet port (3), the tail gas exhaust port (4), an adsorption Tower (5), heater (6), regeneration gas inlet valve (7), adsorption tower upper connection valve (8), ammonia gas outlet valve (9), tail gas discharge main valve (10), adsorption tower lower connection valve (11 ), ammonia inlet valve (12), replacement inlet valve (13) and interconnected pipelines (14). At the same time, an ammonia gas drying method based on temperature swing adsorption is provided. With the above-mentioned technical scheme, the raw material ammonia can be gasified and the distilled intermediate product ammonia gas can be stably dried to a water content below 10ppm, which can be used in continuous production by users, avoiding the fluctuation of ammonia water content in the initial stage of switching the traditional AB tower adsorption drying method Big downside.

Description

technical field [0001] The invention relates to the field of gas purification, in particular to a drying device and a production method for ammonia gas used for strip steel heat treatment. Background technique [0002] Nitriding is a common metal heat treatment process, which is a chemical heat treatment process that makes nitrogen atoms penetrate into the surface of the workpiece in a certain medium at a certain temperature. Common liquid nitriding, gas nitriding, ion nitriding. The traditional gas nitriding is to put the workpiece in a sealed container, pass it through the flowing ammonia gas and heat it. After a long time of heat preservation, the ammonia gas thermally decomposes to generate active nitrogen atoms, which are continuously adsorbed to the surface of the workpiece and diffuse into the surface layer of the workpiece. , thereby changing the chemical composition and organization of the surface, and obtaining excellent surface properties. [0003] In the existi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/04C23C8/26C01C1/02
CPCB01D53/0462B01D2257/80B01D2259/40C01C1/024C23C8/26
Inventor 倪建春殷玫婕宋艳丽吴昊张明
Owner BAOSHAN IRON & STEEL CO LTD
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