Detection and control device for density of regenerative acid and method

Abstract

The invention relates to a detection and control device for the density of regenerative acid and a method; two pressure detection instruments which are connected with a PLC (programmable logic controller) are arranged on a vertical pipeline at the lower end of a regenerative acid tank; and the PLC is also connected with a hydrochloric acid control valve, a weak acid water control valve and a terminal displayer. The PLC calculates the density value of the regenerative acid according to the analog values of the altitude difference and the differential pressure of the pressure measuring instruments and controls the opening and flow of the hydrochloric acid control valve or the weak acid water control valve according to a set initial density value, so as to adjust the density of the regenerative acid. The whole system has simple structure and low cost and is reliable in running and convenient in operation; the detection value is stable and accurate; and the error of the detection value is less than 0.1%; and the device is in line with the industry safety and the environmental protection standard and eliminates the damage of ionizing radiation on a maintenance personnel. The detection and control device is suitable for detecting the density of corrosive or non-corrosive static or flowing liquid.

Description

technical field [0001] The invention belongs to the field of fluid density detection, in particular to a regenerated acid density detection and control device for corrosive fluids, especially a cold-rolled acid regeneration unit and a detection and control method thereof. Background technique [0002] In many industries such as petroleum, chemical industry, metallurgy, and building materials, it is often required to conduct on-line measurement of the density of industrial materials in airtight containers or pipelines. In many sites, the operating equipment has the characteristics of high temperature, high pressure, high viscosity, high toxicity, strong corrosion, etc., and the measurement conditions are relatively harsh. Conventional instruments are often unable to effectively measure the density of these equipment media. With its non-contact measurement characteristics, the isotope meter is used in these special environments and has unique advantages. Among them, the appli...

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Problems solved by technology

[0011] However, the source of radiation equipment has a very strong radiation effect

Whether it is storage, installation or commissioning, it constitutes the threat of radiation pollution within a certain space range, and it is not conducive to personnel repair and maintenance.

Once a leakage problem occurs, it will cause irreversible consequences to the equipment and personnel.

At the same time, the components of radiation equipment are complex and highly integrated, which is not conducive to on-site debugging and off-line maintenance

Especially in the sour gas environment, not only the corrosion resistance of equipment and spare parts has higher requirements, but also the probability of failure is increased, and it needs to be maintained by professionals with relevant skills. The maintenance cost and equipment spare parts Expensive to order, adding to the operating costs of the unit

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