What are the types of methylammonium pumps manufactured in China?
Thread Content
There are two main types of ammonium methane pumps: centrifugal type and plunger type. However, the centrifugal type is basically not produced in China and needs to be imported from abroad. China mainly produces triple plunger type pumps, but a major disadvantage of this type of pump is its high pulse frequency, which can easily cause vibration in its outlet pipe. If it is a five-link or seven-link plunger, its pulse frequency will drop significantly, and accordingly the vibration of the outlet pipe will be much smaller. However, is there any domestic production of five-link or seven-link plunger pumps? It is understood that there was no such pump in the past few years. In recent years, have domestic manufacturers independently developed or cooperated with foreign companies to manufacture such pumps? Friends who know the situation may wish to share their opinions.
Not as far as I know. Who would use a plunger-type ammonium methane pump with complex operation and maintenance, high failure rate, and troublesome maintenance? Even abroad, the impact of methylammonium corrosion on the sealing surface of one-way valves is a headache for manufacturers, let alone domestically. It is estimated that there is no development now, and it is neither necessary nor necessary to spend money on researching obsolete products.
In any case, except for the imported large-scale equipment, most small and medium-sized urea equipment still use plunger-type methane pumps! It is understood that even the imported devices also use the plunger type. After all, the technology is still mature and the efficiency is high.
I said to the original poster, just buy foreign ones. It has a long operating cycle and low maintenance rate and is more cost-effective in the long run. Are you right ;P ;P ;P .
The plunger type was mostly used in the past because it had few precision parts and was easy to process and manufacture. The high-speed and high-pressure ammonium methane centrifugal pump has very strict requirements on the machining accuracy and material of the rotating parts, and these core technologies are basically unavailable in China. This is why they are only imported and expensive. The plunger pumps currently used in China are basically products introduced 20 or 30 years ago, and now they are basically being patched up. Because the technology content is not high, spare parts can basically be obtained domestically. Although it is not easy to use, it is cheap, right? Plunger methylammonium pumps are generally used in small and medium-sized nitrogen fertilizers. It seems that no small and medium-sized nitrogen fertilizers have been launched in recent years, right? I have heard of some expansion and transformation projects, so the market should not be large, and domestic products can basically meet the requirements, but those shortcomings still exist.
Italian plunger pumps are the best choice for methane. Multi-stage centrifugal pumps are also available, but are not as mature as plunger pumps.
----1) There are many users of plunger pumps from domestic manufacturers such as Shanghai Dalong, so there is nothing wrong with that.； 2) After seeing a centrifugal pump, you will know its benefits. borrow some foreign reality * words from staff: I can't smell ammonia even when I lie down in front of the pump. 3) It has been used in the country for more than 20 years, how can it be said that it is immature? ----Of course, the large-scale pump has not been well solved in China and needs to be imported. Come on guys. 4) There is no best, only better. What suits you is best.
All 3/5 units in our unit are imported!! I heard that Shanghai Dalong in China is pretty good!!
Hello: Which foreign factory produces the triple or five-link plunger pump used in your factory? Which company in China is the agent for this product? Thank you!
It is understood: The high-pressure ammonium methane pump (301J/Js) of the urea plant of Sinopec Baling Petrochemical Branch is a vertical five-piston pump imported from the former West Germany in 1975. The model is VQE-H. The normal speed is 72r/min, the maximum speed is 107r/min, the crankshaft material is 40Cr, and a gear oil pump is used for forced lubrication. The crank neck diameter is 152mm, the main crankneck diameter is 315t, and the total length is 2175mm. Large-scale steam stripping urea generally uses a vertical 5-column system from the West Devoxintun plant. Lutianhua uses a vertical 5-column system from Watsonen Company in Hamburg, Germany. This post was last edited by lth on 2009-3-23 19:41 ]
The ones produced by Shanghai Dalong can basically meet the requirements. Because the plunger type was mostly used in the past because it has few precision parts and is easy to process and manufacture. The high-speed and high-pressure ammonium methane centrifugal pump has very strict requirements on the machining accuracy and material of the rotating parts. However, these core technologies are basically not authorized abroad, and the parts can only be imported at high prices. The multi-joint plunger is also from abroad. If the flow rate is small, just use a few domestic pumps and the problem will be solved.
Ammonia pumps and methane-ammonium pumps of small and medium-sized domestic nitrogen fertilizer companies are generally triple or quintuple plunger pumps, which are troublesome to maintain and pose safety risks. Especially for triple plunger pumps, the attached pipelines vibrate greatly and need to be reinforced frequently, and the alternating load causes great damage to the pump body and bolts. They need to be replaced frequently, otherwise accidents may easily occur. Our company has parked the system many times due to fatigue fractures of the bolts on the ammonia pump and methane-ammonium pump body, and there is no good solution.
I think Shanghai Dalong's pumps are quite good. Our three systems use Shanghai Dalong's plunger pumps, which are more convenient for maintenance. The general filling cycle is three months, and the cycle of the combination valve is a little longer.
Mainly produces triple plunger type in China
Our factory uses a pump: 3J1A-4-12/22 four units