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FJX type forced circulation pump (axial flow pump)
FJX type forced circulation pump is a high flow, low head axial flow pump that works by utilizing the horizontal thrust generated by the rotation of t
Product details
Introduction:FJX type forced circulation pump is a high flow, low head axial flow pump that works by utilizing the horizontal thrust generated by the rotation of the impeller along the pump shaft direction, and is therefore also known as a horizontal axial flow pump. Mainly used in industries such as diaphragm caustic soda, phosphoric acid, vacuum salt production, lactic acid, calcium lactate, alumina, titanium dioxide, calcium chloride, ammonium chloride, sodium chlorate, sugar production, molten salt production, papermaking, and wastewater for evaporation, concentration, and cooling. To improve equipment production capacity and increase the heat transfer coefficient of heat exchangers for forced circulation. Therefore, it is also known as an axial flow evaporative crystallization circulation pump.
The components of FJX forced circulation pump that come into contact with the medium are commonly made of materials such as 0Cr18Ni9, 1Cr18Ni9, 0Cr18Ni9Ti, 1Cr18Ni12Mo2Ti, 40Cr, Monel, 1Cr18Ni12Mo2Ti, Ti (titanium), 20 alloy steel, etc. The shaft seal generally adopts a double end mechanical seal, and users can choose according to their actual working conditions.
Application:Phosphate fertilizer plant: forced circulation of media for wet process phosphoric acid concentrator and ammonium phosphate slurry concentrator.
Bayer process alumina plant: forced circulation of sodium aluminate liquid evaporator medium.
Diaphragm caustic soda plant: forced circulation of NaCl containing caustic soda liquid evaporator medium.
Vacuum salt production: forced circulation pump for NaCl evaporation crystallizer medium.
Mangnitrate plant: forced circulation pump for Na2SO4 evaporator medium.
Wet metallurgical plant: forced circulation of evaporation crystallizer media such as copper sulfate and nickel sulfate.
Alkali refining plant: ammonium chloride process cold precipitation crystallizer, forced circulation of ammonia mother liquor in salt precipitation crystallizer.
Soda ash plant: ammonium waste liquid recovery process, forced circulation of CaCl2 evaporator medium.
Paper mill: forced circulation of the medium in the dark night concentrator.
Power plants: forced circulation of ammonium sulfate evaporation crystallizer media in flue gas desulfurization, coking plants, and chemical fiber plants.
Light industry: forced circulation of station media such as alcohol concentration, citric acid evaporation, and sugar evaporation.
Performance range:Flow rate Q 300~12000m3/h
Head H 2~5m
Imported diameter DN 250~1000mm
Working pressure 1.0MPa
Working temperature ≤ 170 ℃
Explanation of pump model meaning:
Structural features:
Good anti cavitation performance: suitable for low-level evaporators, significantly reducing investment in evaporation plants. It is also suitable for new evaporators with high fluid resistance heating chambers on the inlet side of the pump (reverse circulation evaporator, dual heating chamber series evaporator).
High pump efficiency and wide high-efficiency zone: By changing the blade installation angle and speed, users' requirements for flow rate and head can be met, and the energy-saving effect is significant within the high-efficiency zone of the pump operating station.
Slow type: The pump runs smoothly; The overcurrent components have light wear and long service life; Low degree of crystal damage, suitable for evaporative crystallization process.
Cantilever rotor: Compared with the double support type, the number of shaft seals is halved, the pump is lightweight, the external dimensions are small, and maintenance is convenient.
Pump body center support: Compared with the pump body foot support type, the rotor has better thermal neutrality.
Rear door structure: The rotor can be extracted without disassembling the inlet and outlet flanges of the pump body, making maintenance convenient and quick.
Advanced shaft seal: using containerized machine seal, with a lifespan of 6-12 months; Seal with a new type of liquid blocking packing for 3-6 months.
Evaporator without expansion joint: can be used for elastic pump base or suspended pump, reliable thermal compensation, reducing evaporator investment.
High overall reliability: The pump shaft has high strength, the bearing capacity is large, the bearing seat has a water-cooled sleeve, the shaft seal has a long service life, and the material performance is good, ensuring long-term operation of the single pump.
Performance parameter table
Users should pay strict attention when using it
1、 Lubricating oil should be added to the bearing box, and the oil level should be controlled at the middle level of the oil window.
2、 Before driving, manually rotate the coupling to check for any jamming during installation. If there are any scratches or abnormalities, they should be eliminated.
3、 Before starting, connect the coolant flushing solution first. When stopping, stop the vehicle first and then turn off the coolant flushing solution.
4、 The cooling flushing fluid must be clean, non scaling soft water, so newly installed pipelines and storage tanks should be flushed clean. Prevent solid substances from entering the mechanical seal and affecting the sealing effect and service life. Water that is prone to scaling can block the cooling flushing fluid pathway. It will also affect the effectiveness and lifespan of the seal.
5、 The use of condensed water as a sealing flushing solution is ideal, with a temperature below 85 ℃.
6、 The pressure of the cooling flushing liquid is 0.1~0.3 MPa, and the flow rate is 0.63 m3/h. If the flow rate is too small, it will affect the service life of the seal.
Troubleshooting methods and ordering instructions
|
Fault phenomenon |
Reason for malfunction |
Elimination methods |
|
Axis power approaches or exceeds the rated power of the motor |
1. The liquid level in the evaporation chamber decreases; 2. Heating tube crystallization or crystal block detachment blocking the heating tube; 3. The selected pump flow rate is too high, and the pump is running at a low flow rate; 4. The concentration of liquid and solid phases in the evaporator increases, and the medium degree exceeds the design value; |
1. The liquid level has risen to the normal value; 2. Clean the evaporator 3. Reduce the pump speed 4. Check the liquid-solid separation equipment and evaporation operation of the evaporation system; |
|
The operating flow is lower than the design requirements |
1. Heating tube crystallization, crystal block blocking evaporator circulation tube and heating tube; 2. Insufficient pump speed; 3. Severe blade wear; 4. The radial clearance between the impeller and the pump body is too large; 5. The resistance of the evaporator circulation is greater than the design head of the pump (unreasonable pump selection) |
1. Wash and fill the evaporator;
2. Check if the belt is slipping and tighten it; 3. Replace the blades; 4. Weld the outer edge of the blade, then process or replace the impeller; 5. Increase the blade installation angle or increase the speed. If the motor power is insufficient, replace it; |
|
Excessive leakage of shaft seal |
1. Crystals enter the friction surface of the machine seal, causing excessive wear on the dynamic and static rings. |
1. Increase the pressure of the internal flushing fluid. If the sealing surface of the dynamic and static rings is worn, they should be repaired or replaced |
|
Excessive pump vibration or noise |
1. The liquid level of the evaporator is too low; 2. The vortex in the tangential feed evaporation chamber carries steam into the downcomer circulation pipe; 3. Loose blades and unbalanced impellers; 4. The inlet side of the pump is partially blocked by crystal blocks or foreign objects. |
1. Raise the liquid level of the evaporator; 2. Add vortex eliminators or increase the diameter of vortex eliminators in the lower cone of the evaporation chamber; 3. Adjust the installation angle of each blade and fix it firmly, and perform static balance on the impeller; 4. Open the evaporator inlet for inspection and perform washing and filling operations. |
|
The bearing temperature is too high |
1. The axial clearance of the outer radial thrust bearing is too small; 2. The oil return groove on the inner side of the inner and outer bearing covers is not placed below; 3. The lubricating oil level is too high or too low; 4. Lubricating oil enters the water or deteriorates. |
1. Reduce the thickness of the gasket at the outer bearing cover. Adjust the axial clearance to the specified value; 2. The arrows on the inner and outer bearing covers should be directly above; 3. Check if the constant position oil cup is blocked; 4. Perform a pressure test to check for sand holes in the water-cooled jacket and replace the lubricating oil. |
Ordering Instructions
Properties of the conveying medium
Performance parameters of the pumpLiquid name and composition
Flow usage temperature and temperature variation range
Head viscosity
Import pressure ratio
Outlet pressure saturated steam pressure (at operating temperature)
NPSHa value concentration
PH value
pump structureName, size, specific gravity, and content of solid particles contained
Is there any precipitation or crystallization of the material in the overcurrent section of the pump
Sealing formmotor
Export direction form, speed, voltage, frequency
Caliber spare parts, special accessories
Flange specificationsspecial requirements
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