Desulfurization Circulation Pump
Application areas have expanded beyond caustic soda evaporation to include: ammonium phosphate, phosphoric acid, vacuum salt production, alcohol, lactic acid, alumina, rutile titanium dioxide, calcium chloride, ammonium chloride, refrigerants, molten salts, polyvinyl chloride, waste acid concentration, and other industries.
Installation configurations include: ground-mounted fixed installation, suspended installation, and floating installation on the surface of a tank.
This series of pumps are high-flow, low-head chemical axial flow pumps, primarily used in forced circulation systems such as evaporation, concentration, flash evaporation, and cooling.
Sealing Structure: Auxiliary impeller + composite double-ended mechanical seal / composite double-ended mechanical seal / double packing seal.
This series of pumps features three configurations: horizontal curved-tube type, rear-pull three-way type, and vertical axial-flow type. Featuring a modular double-ended mechanical seal, transmission options include direct coupling via flexible couplings, belt drives, universal joint drives with gear reducers, and hydraulic coupling drives. Wetted materials encompass 304, 316L, 2205, 2507, 904L, Hastelloy series, Monel series, and titanium series.
Scope of Application
1. Chemical Industry
Evaporation and Crystallization Systems: Used for forced circulation in evaporation crystallizers for phosphoric acid, ammonium chloride, calcium chloride, etc.
Acid and Alkali Handling: Suitable for transporting highly acidic media such as sulfuric acid, hydrochloric acid, phosphoric acid, etc.
Organochlorine Processing: Conveys corrosive chemicals in organochlorine production processes.
2. Salt and Alkali Production Industry
Vacuum Salt Production: Forced circulation in NaCl evaporation crystallizers.
Membrane Caustic Soda Production: Forced circulation in caustic soda solution evaporators containing NaCl.
3. Nonferrous Metals and Metallurgy
Hydrometallurgy: Forced circulation in evaporative crystallizers for copper sulfate, nickel sulfate, etc.
Alumina Production: Forced circulation in sodium aluminate evaporators.
4. Paper and Sugar Industries
Paper black liquor treatment: Used for forced circulation in paper black liquor concentrators.
Sugar Evaporation: Used for forced circulation in sugar syrup evaporation processes.
5. Environmental Protection and Wastewater Treatment
Advanced Wastewater Treatment: Used for advanced treatment and evaporation crystallization of saline wastewater.
Flue Gas Desulfurization: Used for slurry circulation in power plant flue gas desulfurization systems.
6. Pharmaceutical and Food Industry
Pharmaceutical Production: Used for transporting high-purity pharmaceutical solutions and chemical reagentsFood processing: Used for conveying food-grade liquids such as fruit juices and syrups.
Flow Rate Q: 300–23,000 m³/h
Head H: 1.5–7.0 m
Design pressure P: ≤0.6 MPa
Design temperature T: 200°C
Installation Methods for Forced Circulation Pumps
The installation of forced circulation pumps typically involves the following key steps:
Design and Site Selection: Before commencing installation, conduct a rational design and site selection process. Determine the pump’s location and layout based on system requirements and process specifications. Select a safe and stable area considering maintenance and operational convenience, ensuring sufficient space for pump installation and servicing.
Pump Foundation: Forced circulation pumps require a solid foundation for support. Design and construct a foundation suitable for the pump’s model and size to ensure it can withstand operational vibrations and gravitational forces. The foundation must possess sufficient strength and stability while incorporating vibration and noise reduction requirements.
Piping Connections: Connecting the forced circulation pump to the piping system is a critical installation step. Ensure appropriate pipe sizing and material selection, and correctly install fittings and seals. Pay attention to pipe layout and support to avoid excessive bends or torsional stress, thereby minimizing system resistance and pressure loss.
Electrical Wiring: Proper electrical wiring is essential for the pump’s reliable operation. Connect power and control circuits according to electrical codes and relevant standards. Ensure the safety and reliability of electrical equipment, implementing necessary grounding and insulation protection.
Operating procedures can be divided into several steps: pre-operation preparation, checking the rotation direction, starting, running, and stopping.
Preparation Before Operation
Lubrication may be performed using HD20 lubricating oil.
Oil Filling Method: Loosen the vent valve. After installing the oil level gauge, inject lubricating oil through the vent hole until the oil level reaches the connecting elbow of the gauge. Then pour oil into the oil cup and quickly return it to the operating position. Reinstall the vent plug. After a short wait, check if the oil level in the cup is dropping. The oil cup should always remain filled with oil. Note: The oil level must always remain below the upper vent groove of the coupling elbow and should be kept clean.
Before starting the circulation pump, the pump and suction piping must be vented. The pump may be primed using the conveyed medium. All valves on the suction piping must be fully opened. All auxiliary connections on the pump must be engaged. Ensure that the flow of medium within the piping remains unaffected. Open the shut-off valve on the vacuum balancing pipe.
Check Rotation Direction The rotation direction of the circulating pump must match the arrow direction on the pump. This can be verified by quickly starting and stopping the circulating pump. The coupling guard should be installed in a clockwise direction.
When the boiler forced circulation pump starts, the outlet shut-off valve must be closed. As the boiler circulation pump reaches full speed, gradually open the outlet valve to adjust the operating point.
Note: If leakage occurs after reaching operating temperature, the bolts between the intermediate bracket and pump body must only be tightened after the circulation pump has stopped.
During operation of the forced circulation pump, ensure the pump remains balanced at all times with no vibration. The pump must not operate without lubricating oil.
Do not operate with the outlet valve of the circulation pump closed for extended periods. The maximum permissible bearing temperature may exceed ambient temperature by 50 degrees, but must not exceed 90 degrees. Always ensure the oil level remains at the normal position. The shut-off valve on the auxiliary line must be open when the circulation pump is in operation.
Any standby pump should be operated briefly each week to ensure it is immediately ready for use in emergencies. Auxiliary equipment should maintain proper operational performance. After a period of use, elastic coupling components will experience wear and should be replaced at appropriate intervals.
Shutdown
If the outlet pipeline is equipped with a check valve or non-return valve and the pipeline maintains discharge pressure, the shut-off valve can remain open. Shutting down the motor will cause the circulation pump to gradually stop. For extended shutdowns, close the suction line shut-off valve. After the circulation pump cools, supply of cooling water, flushing water, seal fluid, etc., can be interrupted. The pump shaft connected to the vacuum vessel still requires cooling water even after the forced circulation pump is stopped. For long-term shutdowns or low-temperature conditions, promptly drain all water or media from the pump and cooling lines to prevent freezing and cracking. Power consumption load increases.。
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