CN200996055Y

CN200996055Y - Electrolyte overheat online inspecter for aluminum electrolyzer

Info

Publication number: CN200996055Y
Application number: CN200720010200.0U
Authority: CN
Inventors: 戚喜全; 马成贵
Original assignee: Northeast University Design and Research Institute Co Ltd
Current assignee: Northeast University Design and Research Institute Co Ltd
Priority date: 2007-01-17
Filing date: 2007-01-17
Publication date: 2007-12-26
Anticipated expiration: 2017-01-17

Abstract

A superheat on-line detector of electrolyte in aluminum reduction cell consists of a protective tube of temperature measurement probe, a temperature measurement probe, a signal extension line and a record detector. The utility model is characterized in that: (1) the protective tube of temperature measurement probe adopts a sandwich structure, wherein the external tube is a cooling-air compression tube and the internal tube is a sheath of the temperature measurement probe; (2) and that the protective tube of temperature measurement probe is made of electrolyte melting-proof material.

Description

A kind of aluminum cell electrolyte superheat degree on-line detector

Technical field

The utility model belongs to the automatic control of aluminium cell or the technical field of setting device, is specifically related to a kind of aluminum cell electrolyte superheat degree on-line measuring device.

Background technology

Electrolyte superheat degree is meant the difference of electrolyte temperature and its liquidus temperature.In the electrolysis production process, must keep the superheating temperature of appropriateness, to guarantee normal electrolysis production.Research and practice show that all superheating temperature is too high, are unfavorable for the formation and the maintenance of stove group in the groove; Cross low then stablize for the dissolving of alumina material and production unfavorable.Up-to-date research shows that also the current efficiency of electrolyzer mainly is to be controlled by electrolytical superheating temperature.Under certain electrolysis temperature, superheating temperature is low more, and current efficiency is high more.Therefore, aluminium industry worker more and more payes attention to for superheating temperature and control thereof.But how to obtain superheating temperature numerical value, traditional method is regularly to get bath sample, analyzes its molecular ratio, calculates liquidus temperature and calculates superheating temperature.This method is because the cycle is long, and calculation result too lags behind.Simultaneously, because this method is an Indirect Calculation Method, therefore also there is bigger error.

Chinese patent 200320128760.8,200420030787.8 and 200520091983.0 has successively proposed several electrolyte superheat degree testers.The testing method of these instruments all is to utilize dedicated probe to take out small amount of electrolyte in groove, follow the tracks of electrolytical temperature changing process by the thermopair that immerses in the ionogen, determine liquidus temperature according to the temperature jump that occurs in the ionogen phase transition process, and then calculate superheating temperature.But the measurement of these methods is step, and main is that their each measurements need to consume a dedicated probe, and expense is very high.

The utility model content

But the utility model purpose is the device that proposes a kind of continuously measured electrolyte superheat degree.The probe protection tubes of this device is made by the material that a kind of refractory melts electrolyte corrosion, but long period of soaking in fused electrolyte, the start-up control program is measured electrolytical superheating temperature as required.

The utility model proposes a kind of aluminum cell electrolyte superheat degree on-line detector, include temperature probe protective tube, temperature probe, signal extended line and record detector, it is characterized in that: (1) temperature probe protective tube is taked sandwich structure, and its outer tube is the temperature probe sleeve pipe for compression cold air pipe, interior pipe; (2) the temperature probe protective tube is made by the material that refractory melts electrolyte corrosion.

When electrolyte superheat degree on-line detector of the present utility model is installed, probe protection tubes is placed in the fused electrolyte.

In the time will measuring electrolyte superheat degree, to compress freezing air feeds in the compression cold air pipe, meet cold just can the cooling with the contacted liquid electrolyte of compression cold air pipe outer wall and slowly solidify, crystallization, at this moment, temperature probe just can be noted electrolytical whole temperature-fall period, promptly draws an electrolytical temperature lowering curve on the record detector.Occur owing to have tangible platform and flex point on the electrolytical temperature lowering curve, just electrolytical liquidus temperature and superheating temperature can be measured in view of the above.When stopping to compress freezing air and send into, be set in the outer ionogen of the tube wall secondary fusion that just can heat up, the electrolytical heating curve that temperature probe write down, its form is opposite fully with temperature lowering curve, detector detects electrolytical liquidus temperature again, and can check primary detected result.

The temperature probe that electrolyte superheat degree on-line detector of the present utility model is adopted can be the temperature difference heat galvanic couple; It also can be platinum-resistance thermometer.

Characteristics of the present utility model are that detection probe is positioned in the liquid electrolyte continuously, can detect electrolyte superheat degree as required at any time, improve greatly superheating temperature in linearity, for electrolyte temperature control provides real time data.Adopt this device, electrolyte temperature, superheating temperature control accuracy will be improved greatly, significantly improve current efficiency and the index that cuts down the consumption of energy.

Description of drawings

Fig. 1 is the utility model electrolyte superheat degree on-line detector device synoptic diagram;

Fig. 2 is the time-temperature curve in the electrolyte coagulation process.

Among Fig. 1,1 is probe protection tubes; 2 compression cold air pipes; 3 temperature probe sleeve pipes; 4 temperature probes; 5 signal extended lines; 6 record detectors.

Embodiment

As shown in Figure 1, aluminum cell electrolyte superheat degree on-line detector of the present utility model comprises probe protection tubes 1, signal extended line 5, record detector 6 and temperature probe 4.Probe protection tubes 1 adopts sandwich structure, and its outer tube is compression cold air pipe 2, and interior pipe is a temperature probe sleeve pipe 3.Probe protection tubes is immersed in the ionogen all the time, during measurement, feeds the compression freezing air in compression cold air pipe 2, at this moment, can meet coldly with the contacted ionogen of probe protection tubes 1 outer wall, and temperature descends and slowly solidifies.In the electrolyte coagulation process, but use the just electrolytical temperature whole variation process of perception of temperature probe 4, and signal passed in the record detector 6 by signal extended line 5, just can draw A-B-C time-temperature curve in as shown in Figure 2 the ionogen temperature-fall period on the detector at record.Like this, electrolyte primary crystal temperature and superheating temperature just can be at once by respective record with calculate.Stop logical freezing air, being set in the outer ionogen of probe protection tubes wall again can secondary fusion, and its heating curve becomes the C-B-A curve, and the record detector can detect liquidus temperature again, and can check primary detected result.

Aluminum cell electrolyte superheat degree on-line detector of the present utility model, in specific implementation process, its temperature probe can adopt temperature difference thermocouple, as platinum-platinum rhodium thermocouple or nickel chromium triangle-nickel aluminothermy galvanic couple; Also can adopt platinum-resistance thermometer.

The utility model can detect electrolyte superheat degree as required at any time because its probe is positioned in the liquid electrolyte continuously, improve greatly superheating temperature in linearity, controlling for the temperature of electrolyzer provides real time data accurately.In addition, because protective tube is to adopt special electrolyte-resistant corrosion material to make, what each measurement consumed only is a spot of pressurized air, can not damage temperature probe, and therefore the cost of measuring is also very low.

Claims

1. an aluminum cell electrolyte superheat degree on-line detector includes temperature probe protective tube, temperature probe, signal extended line and record detector, it is characterized in that:

(1) the temperature probe protective tube is taked sandwich structure, and its outer tube is the temperature probe sleeve pipe for compression cold air pipe, interior pipe;

(2) the temperature probe protective tube is made by the material that refractory melts electrolyte corrosion.

2. by the described aluminum cell electrolyte superheat degree on-line detector of claim 1, it is characterized in that the temperature probe in the said temperature probe sleeve pipe can adopt the temperature difference heat galvanic couple; Also can adopt platinum-resistance thermometer.