A kind of method that urea ammonium nitrate solution carries out turbidity removal and filling simultaneously

Abstract

The invention relates to a method for simultaneous turbidity removing and filling of a urea ammonium nitrate solution. According to the method, a urea ammonium nitrate solution filling system is adopted. The system comprises a turbidity removing device, a storage tank, a filtering tank, a conveying pump and a filling hose, wherein the storage tank, the filtering tank, the conveying pump and the filling hose communicate in sequence through pipelines. The filling hose is connected to an inlet short pipe of the turbidity removing device; a filling valve and a flow meter are further installed on the pipeline between the conveying pump and the filling hose; the conveying pump and the filtering tank further communicate through a backflow pipeline; and a pressure gauge and a backflow valve are installed on the backflow pipeline. In the filling process, the flow-integrating value of the flow meter is set, the flow meter is interlocked with a power source switch of the conveying pump, and when the flow-integrating value of the flow meter reaches the set flow-integrating value, the switch of the conveying pump is switched off, so that the accident of filled-tank overflowing caused by desertion of an operator is prevented; and the high-limit pressure value of the pressure gauge is set, the pressure gauge is interlocked with the power source switch of the conveying pump, and when the pressure of the pressure gauge reaches the set high-limit pressure value, the switch of the conveying pump is switched off, so that the burst-open accident of a filter bag due to the large resistance is prevented.

Description

Technical field [0001] The invention relates to a method for simultaneously removing turbidity and filling of a urea ammonium nitrate solution. Background technique [0002] Urea ammonium nitrate solution, also called nitrogen solution, or UAN for short, is a stable, colorless and transparent liquid nitrogen fertilizer prepared from urea, ammonium nitrate and water. It is widely used for mechanical spraying of field crops or through pipelines. Drip irrigation. [0003] The urea solution or ammonium nitrate solution used to prepare UAN sometimes causes solid impurities to be brought into the UAN product due to the return of materials or equipment maintenance. The soft water added in the production may also carry rust into the product. [0004] Solid impurities will affect the transparency of the product, and rust will also cause the product to be colored, turbid, and the appearance of colored products is not good, customers do not like it, and affect product sales. In use, the solid...

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Problems solved by technology

[0005] Due to the large specific gravity of UAN (about 1.3), it is difficult to precipitate the impurities by standing still, and the separation effect is not good when the impurities are precipitated by centrifugation, and there are problems of high energy consumption and complicated equipment; because the impurity particles are extremely small, Generally, metal filter screen and filter cloth cannot remove solid particles below 10 μm. Filtering with a filter press has the disadvantages of low production capacity and poor filtering effect; using activated carbon filtration or chemical precipitation for separation, there are complex devices and secondary pollution. question

[0006] Small particles can be removed by membrane filtration. The rated pore size range of microporous membrane (MF) is 0.02-10 μm, but the processing capacity is small (30 tons / day for a single membrane), and the pressure difference is required as the driving force, which requires a large investment. The treatment cost is high, and it is often used in drinking water treatment or wine purification treatment with low turbidity and small output. It is not suitable for large-scale (1,000 tons per day) UAN industrial production with high turbidity

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