CN87103800A - Enthalpy automatic measuring instrument for liquid concentration - Google Patents
Enthalpy automatic measuring instrument for liquid concentration Download PDFInfo
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- CN87103800A CN87103800A CN 87103800 CN87103800A CN87103800A CN 87103800 A CN87103800 A CN 87103800A CN 87103800 CN87103800 CN 87103800 CN 87103800 A CN87103800 A CN 87103800A CN 87103800 A CN87103800 A CN 87103800A
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- galvanostat
- sulfuric acid
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Abstract
The invention provides a kind of strength of fluid automatic analyzer, and a kind of novel concentration meter for sulfuric acid of specific design.The design concept of this instrument is: when the survey material with adminicle (as water) a certain reaction takes place when mixing and be accompanied by heat to produce, this heat (Δ H) changes the temperature of measured object, this temperature (Δ T) but transfer tracer signal (as ε) to through temperature-sensing element, note the concentration that shows measured object (as sulfuric acid) by registering instrument.Compare with other type densimeter (as conductance type, density type) with the heat content formula concentration meter for sulfuric acid that this principle is made, have advantages such as precision height, measurement range is wide, cost is lower, corrosion-resistant, easy to use.
Description
The present invention relates to the automatic recorder analyser of a kind of concentration, in order to measure strength of fluid automatically and continuously.
In the commercial production of mineral acid, need the concentration of acid is monitored.For example, in sulfuric acid industry, need carry out automatically, monitor continuously 93% dry acid and 98% concentration that absorbs acid.At present in order to the instrument design principle of measuring sulfuric acid concentration generally according to the funtcional relationship between sulfuric acid concentration and its a certain physical constant, infer the concentration of sulfuric acid by certain physical constant value of mensuration sulfuric acid, commonly used have two kinds of conductance type and density types.
The principle of conductance type concentration meter for sulfuric acid is: the conductivity of sulfuric acid changes with the difference of concentration, by both relations, can infer the concentration of sulfuric acid from the survey medium conductivity.But at normal temperatures, between the conductivity of sulfuric acid and the concentration not the single-valued function relation.As 20 ℃ the time, at 92% and 97% concentration place, extreme value appears respectively in its conductivity value.Therefore, can not utilize conductivity to measure sulfuric acid concentration at normal temperatures.The relation of conductivity and concentration raises with temperature and changes, and when sour temperature rise to the 60 ℃ left and right sides, the monotonicity of conductivity makes moderate progress.Therefore, general conductance type densimeter need heat and temperature control medium, and this not only brings the complicated of instrument, and because conductivity is bigger with the change rate of temperature, the raising of measuring accuracy is restricted.The scope of application of this class concentration meter for sulfuric acid is very narrow, and the analyser that measurement 90～94%, 96～99%, 103～105% concentration ranges are arranged commonly used generally can not be replaced each other.
The density type concentration meter for sulfuric acid only is applicable to measures concentration less than 93% sulfuric acid, and this is almost to be flat section because the pass between the density-concentration of sulfuric acid ties up to the high concentration section, even the trend of minimizing is arranged, and it concerns as shown in Figure 1.The conversion of signals of this instrument and register system be more complicated also.
Task of the present invention provides a kind of device of novel mensuration strength of fluid.The solution principle of task of the present invention is: when the material of being measured and another auxiliary substance (as water) when mixing mutually, because of interact (as diluting reaction) emitted heat or absorbed heat, this heat (being △ H) changes the temperature of measured matter, variation of temperature (△ T) can convert recordable signal (as ε) to by a temperature-sensing element (as thermoelectric pile), this signal is noted by registering instrument, just can measure the concentration of material in the liquid.This method requires a certain physical-chemical reaction of selected measured matter, makes tested composition in its thermal effect (△ H) and the liquid be the funtcional relationship of a dullness.
Measured object and adminicle cause galvanostat (1), (2) by pipeline, and each galvanostat has import and at least two outlets, and outlet provides constant liquid stream.One tested logistics mixes in mixed reactor (3) with one both subsidiary streams, in addition one tested logistics and one both subsidiary streams reference instrument (4) of flowing through.Sensing element (5) one ends link to each other with the temperature-measuring port (7) of parts (3), and the other end links to each other with the temperature-measuring port (8) of parts (4), in order to the temperature difference of sensing measured object and reference substance.The extension line of sensing element (5) links to each other with register system (6), and the display panel of registering instrument (9) directly provides the concentration of measured matter.
One embodiment of the present of invention are heat content formula concentration meter for sulfuric acid, and it solves principle and is: sulfuric acid can be emitted a large amount of heat with after water mixes.Under adiabatic condition, this heat can improve the temperature of acid-aqueous systems.If the amount of sulfuric acid and water or flow are constant, the then temperature rise of acid-aqueous systems (△ T) is a dull funtcional relationship that rises with sulfuric acid concentration.This temperature rise (△ T) is converted to electric signal (ε) through thermoelectric pile, and is noted by recorder.Temperature rise higher (ε is bigger), concentration is higher; Temperature rise lower (ε is littler), then concentration is lower.Just can measure the concentration of sulfuric acid thus automatically, continuously.Because temperature rise (△ T) is a dull funtcional relationship (seeing accompanying drawing 3) that rises with concentration in full concentration range, do not occur and there is extreme value.Therefore the sulfuric acid concentration of concentration arbitrarily in this concentration meter for sulfuric acid energy measurement 0～100% scope, even can be used for measuring the sulfuric acid concentration of＞100% content.
This concentration meter for sulfuric acid is finished as follows, and accompanying drawing 4 is structure principle charts of heat content formula concentration automatic analyzer embodiment heat content formula concentration meter for sulfuric acid.Densimeter mainly is made up of galvanostat, mixer, reference instrument, thermoelectric pile, five parts of registering instrument.Specify as follows:
Draw the import (16) that one sulfuric acid is connected to galvanostat (10) from sulfuric acid production line; Draw the import (19) that one water is connected to galvanostat (11) after filtering from water supply system.The outlet (17) of galvanostat (10), (18) provide the equal and stable acid stream of two plume amounts respectively, and the outlet (20) of galvanostat (11), (21) provide two plume amounts respectively and equate and stable current.The interface (27) of mixer (12) is connected with the outlet (18) of galvanostat (10), and the outlet (20) of galvanostat (11) is connected with the interface (29) of mixer (12).Sour water hybrid reaction and emit heat in mixer (12) raises the temperature of acid-aqueous systems.This temperature is positioned at the probe sensing of temperature-measuring port (30) by thermoelectric pile (13).The aqueous acid that mixes is discharged from outlet (28) and is returned sulfuric acid production system.The interface (22) of reference instrument (14) is connected with the outlet (17) of galvanostat (10), and acid stream flows out from (17), through reference instrument (14), carries out discharging from outlet (24) after the heat interchange with current; The water that is flowed out by the outlet (21) of galvanostat (11) enters reference instrument (14) from interface (23), discharges from outlet (25) after heat exchange.The other end of thermoelectric pile (13) links to each other with temperature-measuring port (26) on position what galvanostat (14).Be converted to electric signal (ε) input corrector (31) by the temperature rise of thermoelectric pile (13) sensing, corrector (31) is in order to proofread and correct the influence because of the factors such as error on making, and guarantees that the data that registering instrument provides are reliable.(31) primary structure is a voltage divider or an adjustable resistance (deciding on the registering instrument type).Signal input registering instrument (15) after proofread and correct (31), the scale of index dial (32) is by △ T(ε)～funtcional relationship between the concentration directly demonstrates the concentration of sulfuric acid.
Because this device has adopted the reference circuit, thereby has eliminated most errors of being brought because of temperature rise, external interference factor etc., has improved the precision of instrument.Under the condition of gas washing in SA production continous-stable, measuring accuracy is not less than ± and 0.1～0.2%.
The measured H of this densimeter
2SO
4Concentration range unrestricted (0～100% so that＞100%), wide than other type concentration meter for sulfuric acid measurement range, only need a cover pick-up unit, need not replace.
The test section of this measuring instrument (comprising galvanostat, mixer, reference instrument) is to make with resistant material, and safe and reliable, serviceable life is longer.Dilution heat by what sulfuric acid is very little with the value that the system temperature variation changes, and this densimeter can be suitable for very wide temperature range (0～200 ℃).
The register system of this densimeter is made up of common electrical tentiometer or millivoltmeter.After putting into production, Displaying Meter is the universal product, is easy to realize standardization, the seriation of product.
The temperature-sensing element of this densimeter directly provides electric signal (ε), and just what links to each other with electronic computer system, can realize the Automatic Control of production operation.
Made by glass by this densimeter of what test section (comprising galvanostat, mixer, reference instrument and connecting pipe), Displaying Meter is the universal product; And the test section of conductance type and density type densimeter and Displaying Meter all need special production, and become complicated because of requirements such as temperature control make structure.Therefore, this densimeter has advantages such as simple in structure, easy to use, with low cost, corrosion-resistant.
Enthalpy automatic measuring instrument for liquid concentration is applicable to that it is liquid that mensuration has a kind of reactant at least, and reacts the concentration analysis of composition in the liquid that is attended by the thermal effect generation.
Claims (5)
1, a kind of with temperature-sensing element thermal change is converted to can be for the signal of measuring, have the enthalpy automatic measuring instrument for liquid concentration of register system, it is characterized in that it is made up of galvanostat [1], [2], mixed reactor [3], reference instrument [4], temperature-sensing element [5], register system [6];
1.1 galvanostat [1,2] respectively has import and at least two outlets, an outlet provides constant liquid stream, flows into mixed reactor [3], and another outlet provides constant liquid stream, the reference instrument of flowing through [4];
1.2 mixed reactor [3] has two imports and one outlet and at least one temperature-measuring port [7] at least;
1.3 reference instrument [4] has two imports and two outlets at least and has a temperature-measuring port [8] at least;
1.4 temperature-sensing element [5] one ends are connected with the temperature-measuring port [7] of mixed reactor [3], the other end is connected with the temperature-measuring port [8] of reference instrument [4], and extension line is connected with register system [6].
2, a kind of heat content formula concentration meter for sulfuric acid that includes registering instrument and thermoelectric pile is characterized in that densimeter contains:
2.1 galvanostat (10), (11):
2.1-1 galvanostat (10) has import (16), at least two outlets (17), (18);
2.1-2 galvanostat (11) has import (19), has two outlets (20), (21) at least;
2.2 reference instrument (14):
2.2-1 parts (14) primary structure is a heat exchanger;
2.2-2 parts (14) have two imports (22), (23) at least, two outlets (24), (25) and at least one temperature-measuring port (26);
2.3 proving installation (12):
2.3-1 parts (12) have two imports (27), (29) at least, an outlet (28) and at least one temperature-measuring port (30);
2.3-2 the primary structure of proving installation (12) is a mixer;
2.4 thermoelectric pile (13):
2.4-1 thermoelectric pile one end is connected with reference instrument temperature-measuring port (26), the other end is connected with proving installation temperature-measuring port (30), and extension line is connected with corrector (31).
2.5 register system:
2.5-1 the index dial of making according to the funtcional relationship between temperature rise △ T and the sulfuric acid concentration (%) (32);
2.5-2 means for correcting (31).
3, according to claim 1, described enthalpy automatic measuring instrument for liquid concentration is characterized in that galvanostat, reference instrument and mixed reactor make with resistant material.
4, enthalpy automatic measuring instrument for liquid concentration according to claim 1 is characterized in that being applicable to that it is liquid that mensuration has a kind of reactant at least, and reacts the analysis of constituent concentration in the liquid that is attended by the effect generation.
5, concentration meter for sulfuric acid according to claim 2 is characterized in that galvanostat, reference instrument and mixer (proving installation) make with glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87103800 CN87103800A (en) | 1987-05-22 | 1987-05-22 | Enthalpy automatic measuring instrument for liquid concentration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87103800 CN87103800A (en) | 1987-05-22 | 1987-05-22 | Enthalpy automatic measuring instrument for liquid concentration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87103800A true CN87103800A (en) | 1987-11-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87103800 Pending CN87103800A (en) | 1987-05-22 | 1987-05-22 | Enthalpy automatic measuring instrument for liquid concentration |
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| CN (1) | CN87103800A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105136851A (en) * | 2015-09-22 | 2015-12-09 | 中国石油大学(华东) | Device and method for measuring heat effect in isothermal hot reaction process of carbonaceous macromolecules |
-
1987
- 1987-05-22 CN CN 87103800 patent/CN87103800A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105136851A (en) * | 2015-09-22 | 2015-12-09 | 中国石油大学(华东) | Device and method for measuring heat effect in isothermal hot reaction process of carbonaceous macromolecules |
| CN105136851B (en) * | 2015-09-22 | 2018-06-26 | 中国石油大学(华东) | A kind of device and method for measuring fuel factor in carbonaceous macromolecular isothermal thermal process reactor |
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