Mechanical settling tank ammonia water and tar oil interface detector and measurement control method

Abstract

The invention discloses a mechanical settling tank ammonia water and tar oil interface detector and a measurement control method. A display (1) is arranged above a base (2), a circuit board (5) is arranged in the base (2), a measurement pipe (3) is arranged below the base (2) and is internally provided with a plurality of temperature sensors (4) according to the position height, the display (1) and the temperature sensors (4) are connected to the circuit board (5) through signal lines; the part of the center of a settling tank (6), which is 300 mm apart from an oil outlet, is provided with the interface detector through a thread or flange, the high oil position and the low oil position of the settling tank (6) are respectively provided with an oil pressure valve (7) and an adjusting valve(8) which are connected with the interface detector through signal lines. The interface detector can make a temperature-tar oil purity-tar oil height coordinate graph by using software programming according to a heat radiation measurement principle, thereby controlling the discharge of tar oil and realizing the zero consumption of tar oil dehydration.

Description

technical field [0001] The invention relates to an ammonia water tar interface instrument and a measurement control method, in particular to a mechanized clarification tank ammonia water tar interface instrument and a measurement control method. Background technique [0002] As we all know, the mechanized ammonia water settling tank is the equipment used by the gas company or coking plant to purify tar. The separation of tar, ammonia water and tar residue is mainly based on the density difference of ammonia water, tar and tar residue and the physical properties of oil-water incompatibility. Dynamic static separation. The dynamic and static separation process is actually a process of temperature change. Before the ammonia tar enters the mechanized clarifier, the two liquids are mixed and dissolved at high temperature and flow into the clarifier with the pipeline. Due to the density difference of ammonia water tar and the physical characteristics of oil-water immiscibility, t...

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Problems solved by technology

[0004] The method of pressure measurement interface is feasible in theory, but in the actual measurement process, the thickness of ammonia water and tar emulsification layer, the purity of tar precipitation, ammonia water entrained in the tar layer, and the viscosity and carbonization of tar often affect the pressure part. Influence, finally lead to too high content of ammonia water in the tar that is pressed out, so this method is not feasible

[0005] Floating ball interface instrument is the product of people's idealization of working conditions. This method can be used when there is no viscosity, no emulsified layer, and the interface is very clear. However, there are viscous tar and uneven height in the mechanized clarifier. The emulsified layer, the tar carbonized layer that is easy to carbonize and scale, when the carbonized layer adheres to the sphere, the weight of the originally calculated specific gravity sphere gradually becomes heavier and sinks

[0006] The radio frequency admittance interface instrument is an ideal interface instrument in the environment where the two media are completely separated, there is no interlayer and inclusion solution, and the emulsified layer is small. The medium is not clearly separated, and the tar purity is stepped from bottom to top, while the measurement parameters of the RF interface instrument are related to the dielectric constant of the measured medium. The dielectric constants of the two media of tar and ammonia are very different. The amount of the amount directly leads to the true and false of the measured signal, making it difficult to distinguish the level of tar from the signal measured by the RF interface instrument

[0007] In the case that the above-mentioned measuring instruments are ineffective, the pressure oil is all manually adjusted, and the band pressure oil is used. However, due to the unstable ammonia water-tar interface in the clarifier, the water content of the tar at the outlet and the oil content of the effluent exceed the standard, which seriously affects the tar and circulation. The quality of ammonia water will increase the energy consumption in the tar dehydration process and affect the normal production of the tar workshop and coke oven. This method has frequent adjustments, heavy workload, harsh environment, poor stability, large error fluctuations, and adjustment lag

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