Precision metering system and method of anti-caking oil of composite fertilizer

Abstract

The invention discloses a precision metering system and method of anti-caking oil of composite fertilizer. The precision metering system comprises a vertical centrifugal type oil supplying pump, a core metering barrel, a centrifugal type oil injection pump and an instrument control device. The vertical centrifugal type oil supplying pump, the core metering barrel and the centrifugal type oil injection pump are connected with the instrument control device. The vertical centrifugal type oil supplying pump and the centrifugal type oil injection pump are connected with the core metering barrel. The instrument control device receives oil level changing signals obtained by a flange type pressure transmitter which is used for detecting oil levels, and calculates instantaneous flow of injected oil via the oil level changing signal in real time so as to control rotation speed of the oil injection pump. The beneficial effects are that reliability and precision of metering are greatly improved; by use of the centrifugal type pump, the precision metering system is simple in structure, low in fault rate, reliable in operation and capable of timely giving an alarm when the instantaneous flow exceeds the set value and when oil paths and devices break down; precise proportioning can be achieved according to the yield of the fertilizer, so cost is reduced and anti-caking effects are improved.

Description

technical field [0001] The invention relates to the field of metering, and more specifically, to an accurate metering system and method for anti-oil accumulation of compound fertilizers. Background technique [0002] In the production of nitrogen, phosphorus and potassium compound fertilizers, preventing caking of finished products is a very important process. According to the instantaneous flow rate of the finished compound fertilizer, the anti-caking oil should be sprayed in proportion. The anti-coagulation oil is solid at room temperature. During the addition process, it needs to be heated to above 60°C to dissolve into a liquid. After being pressurized by an oil pump, it is sprayed on the finished compound fertilizer granules. At present, the amount of nitrogen, phosphorus and potassium compound fertilizer for anti-oil formation is generally between 0.8~2Kg / t, and the instantaneous oil injection amount is between 10~40Kg / h depending on the output of compound fertilize...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide an accurate metering system and method for anti-oil accumulation of compound fertilizer, which is used to solve the problem that various existing metering methods are difficult to measure accurately and display digitally, and the metering pump has many transmission parts and high failure rate. Problem: Using the metering device of the present invention can accurately display and control the fuel injection quantity, greatly improve the reliability of metering, and replace it with a centrifugal pump with simple structure and low failure rate

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