A device and method for online measurement of pH of neutralizing liquid with high temperature and strong scour

Abstract

The invention provides an on-line pH measuring device for high-temperature strong scouring neutralizing liquid, comprising: a measuring sampling cylinder, a pH meter, a pneumatic telescopic protective cover for fixing the pH meter, and a cleaning control device; the measuring and sampling cylinder is provided with a water inlet and a water outlet , test hole, cut-off hole, sewage outlet; the pH meter is fixed on the push rod of the pneumatic telescopic protective cover; There is a washing water inlet and a washing water outlet; the washing water inlet is connected to clean water through a water pipe, the washing water inlet is provided with a washing water solenoid valve, and the washing water outlet is connected to the trench through a water pipe; the cleaning control device includes a DCS control system, The DCS control system is equipped with a main control relay and a cleaning relay. The invention realizes on-line measurement of high-temperature strong scouring neutralizing liquid, has simple structure, automatic cleaning, convenient operation, less clogging, long on-line test time, stable operation, accurate measurement results, and provides convenience for environmental protection and sewage discharge.

Description

technical field [0001] The invention relates to an on-line measuring device and method for the pH of a neutralizing liquid for high-temperature strong scouring. Background technique [0002] In the production process of soda ash by ammonia-soda method, a large amount of waste residue liquid needs to be discharged (about 10m3 of waste residue liquid is produced for every 1 ton of soda ash produced). If it is not handled properly, it will cause serious environmental pollution. Therefore, the waste residue liquid needs to be sent into the neutralization tower, and the kiln gas (that is, the CO2 gas with a concentration of 37.5%) is in parallel contact to undergo a neutralization reaction, so that the waste residue liquid is neutralized. After the neutralized waste residue liquid (neutralization liquid) is mixed in the labyrinth mixing tank and clarification tank, and settled for solid-liquid separation, the clarified liquid overflows into the clear waste liquid tank, and reache...

AI Technical Summary

Problems solved by technology

[0010] (1) The measurement and sampling method is only suitable for production liquids with low temperature, few impurities, and weak scouring strength (such as desalted water, production wastewater, etc.), and is not suitable for high-temperature and strong scouring liquids such as neutralizing liquid. If it is used, sampling will inevitably occur In the case of severe blockage of the measuring device, it cannot meet the requirements of long-term continuous and stable operation

[0011] (2) The requirements for long-term continuous and stable operation of the fully automatic cleaning function of the pH meter cannot be guaranteed

However, the components in the existing pH meter automatic cleaning system (such as air and water solenoid valves, control circuit boards and control chips, etc.) all use imported parts, which have the defects of high price and untimely delivery, which seriously affect the pH meter. continuous and stable operation

[0012] (3) The requirements for long-term continuous and stable operation of the pH composite glass electrode cannot be guaranteed

The current method of cleaning the electrode with dilute hydrochloric acid solution for more than ten seconds is ineffective

The scale layer on the electrode cannot be completely removed, resulting in poor use effect after electrode regeneration, and the reproducibility and accuracy cannot meet the requirements of pH value measurement

[0013] (4) Unobstructed drainage of the cylinder of the pH meter cannot be guaranteed

After a period of trial operation, it was found that the effect was very poor: the stainless steel pipe (or hose) would be blocked after 2 to 3 days of use, and it was extremely difficult to clean, which affected the normal cleaning and maintenance of the pH meter electrode and affected the continuous operation of the online pH meter. Extremely unfavorable

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