An electromagnetic oscillation heating type Kjeldahl nitrogen measurement method distillation device

Abstract

The invention relates to an electromagnetic oscillation heating type Kjeldahl nitrogen measuring method distilling apparatus. The electromagnetic oscillation heating type Kjeldahl nitrogen measuring method distilling apparatus comprises a distilling flask, a heating funnel, a steam lintel and a condensation pipe, wherein a heating element, an arc-shaped coil, a cross-flow fan, a pulse generator and a switch power supply are arranged below the distilling flask; after the switch power supply is turned on, the cross-flow fan and the pulse generator work, and the pulse generator transmits high-frequency current to the arc-shaped coil for generating electromagnetic oscillation; the electromagnetic oscillation acts on the heating element to form eddy current; the eddy current overcomes internalresistance flowing and finishes conversion from electric energy to heat energy; the heating element transmits heat to the distilling flask, and the cross-flow fan takes away the heat, so that the phenomenon that the arc-shaped coil is burnt down due to overheat is prevented. Compared with a resistance wire heating type Kjeldahl nitrogen measuring method distilling apparatus, the electromagnetic oscillation heating type Kjeldahl nitrogen measuring method distilling apparatus disclosed by the invention has the advantages of liquid leakage damage prevention, quick heat dissipation, simple structure and the like as well as has double safe protection functions of preventing dry burning and failure of condensate water.

Description

technical field [0001] The invention belongs to the field of chemical fertilizer detection, in particular to an electromagnetic oscillation heating type Kjeldahl nitrogen measuring method distillation device. Background technique [0002] The Kjeldahl method is a standard method adopted by my country's national standard to detect the nitrogen content in fertilizers. That is, in the presence of a catalyst, the sample is digested with concentrated sulfuric acid to convert the organic nitrogen into inorganic ammonium salts, and then the ammonium salts are converted into ammonia under alkaline conditions, distilled out with water vapor and absorbed by the excess acid solution, and then Titration with standard lye can calculate the nitrogen content in the sample. [0003] At present, the heating principle of the heating device used in the Kjeldahl nitrogen measurement method is the resistance wire type. That is, the iron-chromium-aluminum and nickel-chromium electrothermal allo...

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Problems solved by technology

However, the heat on the inner surface of the resistance wire in this nitrogen fixing device is conducted to the flask, and most of the external heat is lost to the air, resulting in a waste of electric energy; due to the large amount of heat lost, the temperature of the surrounding environment rises, especially in summer. The temperature in the working room exceeds 42°C, which is not conducive to the health of the staff; the heating temperature of the resistance wire is generally as high as about 300°C, and the material is easily burned due to high temperature aging, and the service life is only about half a year

Moreover, due to the long-term use of the nitrogen-fixed flask, in the case of bottom rupture and liquid leakage, it is very easy to cause the local resistance of the resistance wire to decrease, and the resistance wire is short-circuited and burned.

[0004] Since the retort is curved, the general induction cooker is a flat coil, which cannot evenly heat the curved retort, and is not suitable for heating the retort; in addition, the induction cooker coil has no hollow bottom design, which cannot cope with the frequent occurrence of distillation experiments. Leakage problem, so easy to burn the coil

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