The multi-stage decarbonization pump is required for the purification and decarbonization of MDEA amine liquid decarbonization unit. The natural gas decarbonization pump is not only the ideal equipment for decarbonization in the purification process of raw steam of synthetic ammonia industry, but also the best choice for other chemical process pumps.
MDEA is also known as N-methyldiethanolamine. MDEA decarburization device is a process for removing acid gas from natural gas with high carbon dioxide content. MDEA decarburization technology uses activated MDEA aqueous solution to absorb carbon dioxide (CO2) in natural gas or synthetic gas at high pressure and normal temperature. Under the condition of pressure reduction and temperature rise, carbon dioxide (CO2) is desorbed from the solution, and the solution is re absorbed Life.
As carbon dioxide dissolves in water, it will form carbonic acid to improve the acidity of water, which will produce certain corrosiveness to steel. Natural gas will not be treated. In civil gas transmission pipeline, it may produce carbonic acid with residual water in the pipeline, corrode the pipeline, causing leakage and accident. The multi-stage decarbonization pump is required for the purification and decarbonization of MDEA amine liquid decarbonization unit. The natural gas decarbonization pump is not only the ideal equipment for the special decarbonization pump in the purification process of raw steam of synthetic ammonia industry, but also the best choice for other chemical process pumps.
Natural gas decarbonization vacuum pump model, parameters and structure :
The corrosion-resistant multi-stage natural gas decarbonization pump is a single suction, multi-stage, section type corrosion-resistant chemical centrifugal pump, which adopts the national high-efficiency energy-saving water conservancy model, with corrosion resistance and no leakage. The requirements for the use of flow passage parts are divided into cast steel and cast stainless steel, and the material is determined according to the temperature and corrosiveness of the transmission medium. The shaft is a fully sealed structure, ensuring no contact with the medium, no corrosion and long service life. It is mainly used to transport – 20 ℃ ~ 105 ℃ corrosive liquid, low temperature or high temperature liquid, neutral or corrosive liquid in petroleum, chemical industry, synthetic fiber, chemical fertilizer, power station, metallurgy, food and medicine and other industrial sectors. Most customers in petrochemical industry choose it as high-pressure decarbonizing amine liquid circulating pump.
Natural gas decarbonization vacuum pump main parameters:
Flow: 3.7-1350m ³ / h head: 49-1800m efficiency: 32% – 84%
Pump weight: 78-3750kg motor power: 3-1120kw NPSH: 2.0-7.0m
Natural gas decarbonization vacuum pump structure features:
The outlet and inlet of MDEA solution pump are all vertical upward. The suction section, the middle section and the discharge section of the pump are connected into a whole with the tension bolt. The pump rotor is composed of impeller, balance plate and other parts installed on the shaft. Both ends of the rotor are supported by the rolling shaft pump or sliding bearing, and the rolling bearing is lubricated with grease. The axial force of the rotor is balanced by the balance plate.
1. Stator part: it is mainly composed of water inlet section, middle section, water outlet section and guide vane. Each section is tensioned with a through bar to form a working room. The export is vertical and the import is generally horizontal. According to the demand, the import and export can also be vertical and upward.
2. Rotor part: mainly composed of shaft, impeller, balance plate, shaft sleeve, etc. The shaft transmits the power to the impeller to make it work; the balance plate is used to balance the axial force; the shaft is equipped with a replaceable shaft sleeve to protect the shaft.
3. Bearing part: mainly composed of bearing body, bearing and bearing gland. The pump is lubricated by sliding bearing and thin oil, and the other pumps are lubricated by rolling bearing and grease. Rolling bearing structure can also be used.
4. Shaft seal: it is generally sealed with soft packing, mainly composed of the sealing box body, packing and water retaining ring on the water inlet section and tail cover. There is a certain pressure of water in the sealing cavity, which plays the role of water sealing, water cooling and lubrication. The water seal water of MDEA solution pump generally comes from the high-pressure water in the pump, the pressure water in the pump or the external water supply. Mechanical seal is widely used.
Transmission: the pump is directly driven by the prime mover through the elastic coupling. Viewed from the prime mover end, the pump rotates clockwise.
Stainless steel corrosion-resistant multi-stage natural gas decarbonization pump is a horizontal wear-resistant single suction, multi-stage, section type corrosion-resistant centrifugal pump, which is used to transport corrosive liquid without solid particles and temperature lower than 80 ° C. It is made of stainless steel, with strong corrosion resistance, practical safety, economic performance, trouble free operation ability and low maintenance cost.
The impeller of MDEA natural gas decarbonization pump is arranged symmetrically, which can basically eliminate the axial force. The residual axial force is borne by a pair of back-to-back angular contact ball bearings. Because there is no balance device, that is, there is no balance disc friction loss and no balance reflux loss, the efficiency of the pump is 5-14% higher than that of the same type of multistage pump. At the same time, all kinds of faults caused by the failure of the balance device are completely solved, and the service life of the pump is greatly extended.
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