Online pH measurement device and method of high-temperature strong-washing neutralization solution

Abstract

The invention provides an online pH measurement device of a high-temperature strong-washing neutralization solution. The device comprises a measuring sampling tube, a pH meter, a pneumatic telescopicprotecting sleeve for fixing the pH meter and a cleaning control device, wherein a water inlet, a water outlet, a testing hole and a drain outlet are formed in the measuring sampling tube; the pH meter is fixedly arranged on a push rod of the pneumatic telescopic protecting sleeve; the pneumatic telescopic protecting sleeve is arranged at the testing hole and detachably connected with the measuring sampling tube, and a washing water inlet and a washing water outlet are formed in the pneumatic telescopic protecting sleeve; the washing water inlet is connected with clear water through a water pipe, a washing water electromagnetic valve is arranged at the washing water inlet, and the washing water outlet is connected with a trench through a water pipe; the cleaning control device comprises aDCS control system, and the DCS control system is provided with a main relay and a cleaning relay. Online measurement of the high-temperature strong-washing neutralization solution is realized, and the device is simple in structure, capable of performing automatic cleaning, convenient to operate, long in online testing time, stable in operation and accurate in measurement result, can reduce blocking and provides convenience for environment-friendly drainage.

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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