High temperature resistant transparent spiral quartz tube

In processes such as fluid heating, gas preheating, ultraviolet photocatalysis, and high-purity material transportation, traditional straight tube heat transfer structures are often limited by low heat transfer efficiency or large footprint. The high-temperature resistant transparent spiral quartz tube combines the excellent physical and chemical properties of high-purity quartz glass with a compact spiral structure - it can withstand high temperatures of 1200 ℃, has a light transmittance greater than 90%, and is extremely chemically inert. At the same time, the spiral shape increases the heat exchange area per unit length by 3-5 times. As a professional custom manufacturer, Luweiya Quartz provides full parameter personalized customization from tube diameter, wall thickness, number of spiral turns to pitch and port form, helping laboratory research and development and industrial scale mass production improve quality and efficiency.

Frequently Asked Questions (FAQ)

Q1: What are the core advantages of spiral quartz tubes compared to straight tubes or metal spiral tubes?  

A: ① Transparent and visible: can directly observe the fluid state, bubbles or sediment inside the tube; ② Corrosion resistance: except for hydrofluoric acid and hot phosphoric acid, it does not react with other acids and bases; ③ Purity: The total amount of metal impurities is less than 20ppm, and there is no leaching of metal ions; ④ Temperature resistance: far exceeding that of organic glass or metal tubes, and with extremely low thermal expansion.

Q2: Can the spiral tube withstand pressure? Will it deform at high temperatures?  

A: When the wall thickness is 2-4mm, it is recommended to use it under normal pressure or slightly positive pressure (<0.3MPa). We use precision annealing technology to eliminate thermal stress, and the pitch change rate is less than 0.5% under long-term operation at 1000 ℃, without collapse or distortion.

Q3: What is the minimum spiral diameter that can be made? Is there a limit to the number of laps?  

A: The minimum inner diameter of the spiral can reach 30mm, and the maximum is 300mm; the number of turns can be achieved from 1 to 30, and the long tube can be segmented and welded after spiral connection.

Q4: Can we customize double helix or variable pitch structures?  

A: Okay. Complex configurations such as double helix (coaxial inner and outer tubes or parallel dual channels), conical helix, and variable pitch in the middle are supported, and only process sketches or target heat transfer/mixing parameters need to be provided.

What core problems can transparent spiral quartz tubes solve for you?

-Low heat transfer/heating efficiency → Spiral structure generates secondary flow and Dean Vortex, with a heat transfer coefficient 2-4 times higher than that of straight tubes.  

-There are many dead zones in the tubeline, making cleaning difficult. The transparent material and seamless arc transition can be visually cleaned using solvents or brushes.  

-Corrosion/precipitation of metal tubes at high temperatures → Quartz material is completely inert in acidic and oxidizing atmospheres, without affecting material purity.  

-Due to limited equipment space, the spiral shape achieves a long flow channel design in a very small volume, saving effective space in ovens, tube furnaces, or constant temperature baths.

Material grade and key parameters

SiO ₂ purity: ≥ 99%

Total metal impurities: (Fe, Al, Ca, Na, K, Li, etc.) ≤ 20 ppm

Hydroxyl content (OH): ≤ 150 ppm

Maximum operating temperature: 1200 ℃ (long-term)

Thermal shock stability: 800 ℃ ⇔ 25 ℃ air quenching without cracks

UV visible transmittance: ≥ 90% (200-2500nm)

Analysis of Spiral Structure and Performance Advantages

1. Strengthen heat transfer and mixing

The secondary circulation (Dean vortex) driven by centrifugal force is generated when the fluid travels along the spiral channel, effectively destroying the thermal boundary layer. Experimental data shows that under the same Reynolds number, the convective heat transfer coefficient of a helical tube is 2.8-4.2 times that of a straight tube, making it particularly suitable for high viscosity fluids or low flow rate conditions.

2. Compact space design

A spiral tube with an outer diameter of 200mm and 12 turns can have an effective flow channel length of 6-8 meters, while occupying a height of only about 250mm. It can be easily placed in a small tube furnace, oil bath or constant temperature box.

3. Full process visualization

The transparent properties of quartz glass allow researchers to monitor in real-time:

-Two phase flow pattern (slug flow, annular flow, bubbly flow)

-Starting position of crystallization or precipitation

-Color change reaction process

-Bubble generation and coalescence behavior

4. Chemical inertness and pollution-free

After third-party testing, soaking in 90 ℃ aqua regia, concentrated sulfuric acid, and 50% NaOH solution for 72 hours showed no corrosion marks on the surface, and the increase in metal ions in the solution was less than 0.1ppm. Suitable for harsh scenarios such as biopharmaceuticals and electronic grade chemical preparation.

Customizable specification range (supports any combination)

We offer "part level" size customization without mold fees or minimum order quantity restrictions:

Outer diameter of quartz tube: Φ 6mm~Φ 80mm (conventional); Φ 80~Φ 120mm (requires splicing)

Wall thickness: 1.0mm/1.5mm/2.0mm/2.5mm/3.0mm/4.0mm

Spiral outer diameter: Φ 30mm~Φ 300mm

Pitch: equal pitch (10mm~100mm) or variable pitch, customized distribution

Number of turns: 1~30 turns (integral molding); More than 30 circles can be docked

Port types: straight mouth, flared mouth, flanged mouth, ground mouth, threaded joint, flange, pagoda joint

Additional structures: inserted temperature measuring sleeve, jacket insulation layer, branch sampling port, mirror bulge

Customer Application Case (Anonymous)

Case 1: Optimization of Photochemical Reactor in a Biomedical CDMO Enterprise

-Problem: Using a straight tube photoreactor for vitamin D3 photoisomerization reaction results in a short light path, non adjustable residence time, a conversion rate of only 62%, and high by-products.  

-Solution: We customize a Φ 10 × 12mm outer diameter, 15 spiral turns, 18mm pitch, UV high transparency quartz spiral tube, wound around the periphery of a 254nm low-pressure mercury lamp, and the material circulates through the spiral channel.  

-Effect: The residence time was extended from 30 seconds to 7 minutes (with no change in volume), the conversion rate increased to 89%, and the by-products were reduced by 2/3.

Case 2: Thermal Engineering Laboratory of a certain university - Supercritical Water Oxidation Experimental Device

-Problem: The original stainless steel coil suffered severe corrosion in supercritical water at 500 ℃ and 25MPa. Leakage occurred after three experiments, and sediment inside the tube could not be observed.  

-Solution: Provide a transparent quartz spiral tube with a wall thickness of 3.5mm, a spiral outer diameter of 150mm, 7 turns, and enhanced pressure resistance design, equipped with a metal sleeve sealing joint.  

-Effect: Running continuously for 60 batches without leakage, the starting position of NaCl crystallization was clearly observed visually, and the water injection point was optimized accordingly.

Case 3: Gas Absorption in the Preparation of High Purity Hydrochloric Acid by a Semiconductor Wet Electronic Chemical Manufacturer

-Problem: During the absorption of HCl gas by ultrapure water, the gas-liquid contact in the straight tube absorption tower is insufficient, resulting in a high HCl concentration of 800ppm in the outlet tail gas, which is wasteful and environmentally unfriendly.  

-Solution: Adopting a double helix quartz tube absorber - the inner helix carries gas (downwards), and the outer helix jacket carries cooling water; The inner side of the tube wall forms a liquid film due to the spiral centrifugal force, which enhances absorption.  

-Effect: The absorption efficiency increased from 71% to 96.5%, and the tail gas HCl decreased to 28ppm.

Customize your spiral quartz tube immediately

Whether you are using it for photochemistry, heat exchange, gas purification, high-purity material transportation, or require special variable pitch, dual channel, or conical spiral structures - we can achieve it.  

Contact us now and provide any of the following information to initiate the plan:

Required diameter, spiral outer diameter, number of turns/total length

Target heat exchange/mixing/reaction process parameters (temperature, flow rate, material properties)

Hand drawn sketches or photos (we convert them into engineering drawings)

Luverre Quartz is a manufacturer specializing in quartz tubes and other quartz items.We have over 18 years experience with the production of quartz tubes, we will be your reliable partner on quartz tubes and other quartz items.

Luverre Quartz can manufacture customized quartz tubes in various shapes, such as spiral, square, round, with processing including cutting, bending, welding, etc., and available in different colors, such as transparent quartz tubes, opaque quartz tubes, milky white quartz tubes, red quartz tubes, and so on.