Cold Box Air Separation Unit

Name: China Cold Box Air Separation Unit Suppliers Factory - Custom Cold Box Air Separation Unit - NEWTEK INDUSTRY
Brand: NEWTEK
SKU: 273696465

The cold box air separation unit is a key system in air separation equipment with cryogenic distillation technology as its core. Its core component, the "cold box", is a highly integrated cryogenic insulated container that encapsulates key equipment such as distillation towers, heat exchangers, and pipelines. It achieves efficient separation of oxygen, nitrogen, argon and other components in the air by precisely controlling the low-temperature environment. It is widely used in steel, chemical, energy, medical and other fields with strong demand for high-purity gases.

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Description

Technical Parameters

Core composition and features

●Cold box structure
The cold box is the "heart" of the device. It is usually filled with materials with strong thermal insulation properties (such as pearl sand and thermal insulation foam) to form a closed low-temperature environment (temperature as low as -196℃ or below), which can minimize the loss of cold and ensure that the distillation process is carried out at a stable low temperature. The main distillation tower, crude argon tower, condenser evaporator, plate heat exchanger and other core equipment are integrated inside. The pipeline is made of low-temperature alloy materials (such as stainless steel) to avoid embrittlement at low temperatures.
●Core process
Based on the principle of low-temperature distillation: the pre-treated clean air (after compression, dehydration and decarbonization) enters the cold box, is cooled to the liquefaction temperature through the heat exchanger, and then enters the distillation tower. Taking advantage of the boiling point differences of components such as oxygen (boiling point - 183°C) and nitrogen (boiling point - 195.8°C), multiple gas-liquid exchanges are performed in the tower. The low-boiling-point nitrogen rises to the top of the tower, and the high-boiling-point oxygen sinks to the bottom of the tower, ultimately producing high-purity (99.5%~99.999%) oxygen, nitrogen, argon and other rare gases.

cold box air separation unit

advantage

High-purity output

can stably produce ultra-high purity gas (such as electronic-grade nitrogen with a purity of 99.9999%), meeting high-end needs such as precision manufacturing and medical treatment;

Scaled production capacity

a single set of equipment can produce tens of thousands of cubic meters of gas per hour, suitable for large-scale industrial scenarios;

Energy efficiency optimization

the efficient insulation design of the cold box combined with waste heat recovery technology reduces unit gas energy consumption;

Strong stability

the low temperature environment is constant, reducing interference from external factors, and the equipment has a long continuous operation cycle (usually up to 1~2 years without stopping)

application

Industrial manufacturing: providing gas source for steel smelting (oxygen combustion support) and chemical synthesis (nitrogen protection);
Energy field: supplying high-purity gas for natural gas liquefaction and fuel cell support;
Medical and scientific research: providing medical oxygen and ultra-high purity inert gas for laboratory use;
Environmental protection industry: assisting in the denitrification of flue gas from waste incineration (nitrogen as carrier gas), etc.

FAQ

1. How long can the insulation performance of the cold box last? Is it necessary to replenish insulation materials regularly?
The cold box uses high-density pearlescent sand and a sealed structure. Under normal maintenance, the insulation performance can be maintained stably for 8-10 years. The pressure of the insulation layer will be checked during the annual routine inspection. If there is a slight leak, only a small amount of pearlescent sand needs to be replenished. No large-scale replacement is required, and the maintenance cost is low.

2. Can the purity of the gas produced by the device be adjusted according to demand? For example, from 99.9% to 99.999%?
Yes. The gas purity can be flexibly adjusted by adjusting the reflux ratio of the distillation tower, the number of tower plates and other parameters. However, it should be noted that ultra-high purity (such as above 99.999%) requires customization of related components during the equipment design stage. It is recommended to clarify the requirements in the early stage, and we will match the corresponding process plan.

3. What is the service life of the low-temperature equipment in the cold box? Are the core components (such as distillation towers and heat exchangers) easily damaged?
The equipment in the cold box is made of low-temperature stainless steel with excellent anti-embrittlement performance and a designed service life of 15-20 years. Core components such as plate heat exchangers have been verified through pressure tests and low-temperature fatigue tests. The failure rate under normal operation is less than 0.5%/year, and we provide lifelong maintenance support.

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