Melt Surge Tank for Ammonium Nitrate Production

Product Specifications

Technical details and manufacturing context for Melt Surge Tank

Definition

The Melt Surge Tank is a critical component within the Continuous Ammonium Nitrate Melt Production and Concentration System. It acts as an intermediate buffer vessel that receives molten ammonium nitrate from the concentration stage. Its primary function is to absorb flow variations and pressure fluctuations, providing a steady, controlled supply of melt to downstream processes such as prilling or granulation. This regulation is essential for maintaining product quality consistency, preventing system overloads, and ensuring the safety and efficiency of the continuous chemical manufacturing line. The tank is designed to handle the demanding conditions of molten ammonium nitrate, which is corrosive and requires careful temperature control. It is typically constructed from stainless steel grades such as 304L or 316L, or carbon steel with an appropriate lining, to resist corrosion. The tank's nominal capacity ranges from 5 to 50 cubic meters, with a design pressure of 1.0 to 1.6 MPa (per GB/T 150) and a design temperature of 180 to 250°C. Operating temperature is maintained between 160 and 220°C to keep the melt above its crystallization point. The tank may include heating or cooling coils with a heat transfer area of 10 to 80 square meters, and an agitator operating at 30 to 120 rpm to ensure uniform temperature and prevent stagnation. Motor power ranges from 5.5 to 45 kW, and the electrical supply is three-phase, 380 to 690 V AC (per IEC 60038). Ingress protection is rated IP54 to IP65 (per IEC 60529). The empty weight ranges from 2000 to 15000 kg, and overall dimensions are typically 2 to 4 meters in diameter, with height varying by capacity. Wall thickness is 8 to 20 mm, determined by pressure and corrosion allowance. All values are reference ranges and must be verified for the specific model and application with the legal manufacturer or supplier.

Working Principle

The tank operates by receiving a variable inflow of hot, concentrated ammonium nitrate melt. Its volume provides hydraulic capacitance, allowing the liquid level to rise and fall to dampen flow rate changes. It may be equipped with level sensors, heating jackets or coils to maintain the melt above its crystallization point, and an outlet control valve or pump. The principle is one of mass balance and pressure equalization, transforming an intermittent or variable input into a more constant, manageable output for the next stage of the process.

Common Materials

Stainless Steel (e.g., 304L, 316L), Carbon Steel (with appropriate lining)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Nominal Capacity	5–50 m³	Select based on production rate and residence time.
Design Pressure	1.0–1.6 MPa	GB/T 150
Design Temperature	180–250 °C	Must exceed operating temperature to avoid overpressure.
Operating Temperature	160–220 °C	Maintain above melting point of ammonium nitrate (170°C).
Material	316L	Corrosion-resistant to molten ammonium nitrate.ASTM A240
Wall Thickness	8–20 mm	Determined by pressure and corrosion allowance.
Heat Transfer Area	10–80 m²	For heating/cooling coils to maintain temperature.
Agitator Speed	30–120 rpm	Ensures uniform temperature and prevents stagnation.
Motor Power	5.5–45 kW	Depends on agitator size and viscosity.
Electrical Supply	380–690 V AC	Three-phase, 50/60 Hz.IEC 60038
Ingress Protection	IP54–IP65	Protects against dust and water jets.IEC 60529
Empty Weight	2000–15000 kg	Affects foundation and lifting requirements.
Overall Dimensions	2–4 m	Diameter range; height varies with capacity.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Tank Shell Part
Primary pressure-containing body of the vessel.

Material: Stainless Steel / Carbon Steel
Heating Jacket/Coils
Maintains the ammonium nitrate melt in a liquid state by providing external heat.

Material: Stainless Steel
Level Sensor/Transmitter
Measures and controls the melt level within the tank to regulate inflow/outflow.

Material: Stainless Steel (wetted parts)
Insulation Layer Part
Minimizes heat loss from the tank to improve energy efficiency and maintain safe external surface temperatures.

Material: Mineral Wool / Calcium Silicate
Outlet Control Valve
Sets the outflow so the tank can actually smooth the upstream swings.

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Frequently Asked Questions

What is the primary function of a Melt Surge Tank?

It acts as an intermediate buffer vessel that receives molten ammonium nitrate from the concentration stage, absorbing flow variations and pressure fluctuations to provide a steady, controlled supply to downstream processes like prilling or granulation.

What materials are commonly used for construction?

Stainless steel grades such as 304L or 316L, or carbon steel with an appropriate lining, are used to resist corrosion from molten ammonium nitrate. The specific material must be selected based on the application and verified with the supplier.

What are typical design parameters?

Nominal capacity ranges from 5 to 50 m³, design pressure from 1.0 to 1.6 MPa (per GB/T 150), and design temperature from 180 to 250°C. Operating temperature is maintained between 160 and 220°C. These are reference ranges and must be confirmed for the specific model.

How is temperature maintained in the tank?

Heating jackets or coils with a heat transfer area of 10 to 80 m² are used to keep the melt above its crystallization point. An agitator operating at 30 to 120 rpm ensures uniform temperature and prevents stagnation. Verify actual requirements with the manufacturer.

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pressure:	0-2 bar gauge (designed for low-pressure surge absorption)
flow rate:	Up to 50 m³/h (dependent on system configuration)
temperature:	170-200°C (typical ammonium nitrate melt temperature range)
slurry concentration:	Not applicable - designed for pure molten ammonium nitrate (100% melt)

Melt Surge Tank

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