CN1924550A - Instrument for measuring humidity ratio of treatment media and measuring method using same - Google Patents

Abstract

This invention relates to measurement method for medium moisture content device and its method, which comprises three-way valve, vacuum generator, boiling flask, single valve, drying device and vacuum list, wherein, the drying device is laid with drying agent; the one end of three-way valve is connected with drying device and the other end with vacuum generator and with third end as testing medium entrance; the other end of drying device is connected to the flask through single valve; the flask side tube is connected to the vacuum list.

Description

Measure the instrument of humidity ratio of treatment media and utilize the assay method of this instrument

Technical field

The present invention relates to tobacco business, particularly the assay method of humidity ratio of treatment media in the tobacco processing course.

Technical background

In the current food-processing industry, it is rather extensive, especially at the tobacco manufacture field, all the more so to relate to research dry and moisture regain.Tobacco processing course need pass through some dryings and resurgence process, and the variation of treatment media character is the key factor that influences crudy in this course, and therefore, in the tobacco processing procedure, the detection of humiture and control are very necessary.

Present stage is a mensuration by Temperature Humidity Sensor and wet and dry bulb temperature to the measurement of humidity ratio of treatment media in dry and the resurgence process and control.There is certain defective in existing instrumentation and testing method, especially the measurement aspect of humidity, specifically the characteristics of Temperature Humidity Sensor are to be convenient to operation and control, but test has requirement to environment temperature, it is 180 ℃ promptly at the highest probe temperature of the Temperature Humidity Sensor that can buy, Shu Chu data are temperature and rh value or dewpoint temperature simultaneously, and when the temperature of the treatment media that test site need be tested surpasses more than 180 ℃, existing Temperature Humidity Sensor is just powerless, and wet and dry bulb temperature is measured the requirement that environment is difficult for satisfying pyrometry equally.In addition, Temperature Humidity Sensor is when normal pressure and 180 ℃ of mensuration, and the degree of accuracy of the rh value of output is 0.1, because ratio of precision is lower, particularly changing value causes bigger systematic error easily, is not easy to system is in time adjusted.

Summary of the invention

At the above-mentioned problems in the prior art, first goal of the invention of the present invention is: provide a kind of temperature limitation that is not subjected to, the convenient determining instrument of measuring humidity ratio of treatment media in the tobacco processing course.

Second purpose of the present invention is: provide a kind of and utilize described determining instrument that humidity ratio of treatment media in the tobacco processing course is carried out method for measuring.

The present invention solves this technical problem the technical scheme of being taked: a kind of instrument of measuring humidity ratio of treatment media, comprise: T-valve 1, vacuum generator 8, flask 6, retaining valve 5, exsiccator 3 and vacuum meter 7, in exsiccator 3, be placed with drying agent, one end of T-valve 1 is connected with exsiccator 3, the other end is connected with vacuum generator 8, the 3rd end is the tested media inlet, and the other end of exsiccator 3 is connected with flask 6 by retaining valve 5, and the side pipe of flask 6 is connected with vacuum meter 7.

Be provided with the distribution grid 4 that has through hole in the described exsiccator 3, distribution grid 4 is arranged on the bottom in the exsiccator 3, and drying agent is placed on the distribution grid 4, has the inlet of placing drying agent on exsiccator 3, and described inlet is by sealing-plug 2 sealings.

Utilize the method for testing of the instrument of measuring humidity ratio of treatment media, comprise the steps:

A, measure T-valve 1, exsiccator 3 and retaining valve 5 quality and, note is made w1;

B, adjustment T-valve 1, vacuum generator 8 is communicated with exsiccator 3, retaining valve 5 is opened, utilize 8 pairs of total systems of vacuum generator to vacuumize, and be extracted into vacuum meter 7 and show and adjust T-valve 1 when readings are 0.05～0.08MPa, disconnection exsiccator 3 is communicated with vacuum generator 8, vacuum generator 8 cuts out, and is in connected state between flask 6 and the vacuum meter 7 always, and vacuum tightness is designated as P1 at this moment;

C, adjustment T-valve 1 make the medium inlet end of T-valve 1 be communicated with vacuum generator 8, and the medium inlet end is connected with the measured medium outlet, open vacuum generator 8, measured medium is drawn, after 10～30 seconds, adjust T-valve 1 again, the medium inlet end is communicated with exsiccator 3, close vacuum generator 8,, make T-valve 1 and the sealing of exsiccator 3 links when vacuum meter 7 is shown as 0～0.01MPa, stop sampling, vacuum tightness is designated as P2 at this moment;

D, close retaining valve 5, disconnect exsiccator 3 and is connected with flask 6, the quality of measuring T-valve 1 exsiccator 3 and retaining valve 5 with, remember and make w2;

E, calculate H according to following formula ₂O volume content (%):

$H_{2}O\%=\frac{\frac{w2-w1}{18}}{(P2-P1)\frac{V}{\mathrm{RT}}+\frac{w2-w1}{18}}\×100\%$

W1, w2, P1, P2 are test value; Wherein as if vacuum tightness P1, the unit of P2 should be converted to crust (bar) when being MPa (MPa);

V is the volume of total system, and unit is l;

R is a gas law constant; R=0.082barl/molK

T is an ambient temperature value, and unit is K.

The instrument of mensuration humidity ratio of treatment media of the present invention, simple in structure, can in greater than any environment of 50 degrees centigrade, test, and test process is simple, speed is fast, and the general test time can finish less than 3 minutes, and measures accurately, error is little, has overcome in the prior art Temperature Humidity Sensor and wet and dry bulb temperature and has measured the problem that exists in the moisture content.

Description of drawings

Fig. 1 is the structural representation of the instrument of mensuration humidity ratio of treatment media of the present invention.

Embodiment

As shown in Figure 1, measure the determining instrument of humidity ratio of treatment media in the tobacco processing course; T-valve 1, vacuum generator 8, flask 6, retaining valve 5, exsiccator 3 and vacuum meter 7, be provided with the distribution grid 4 that has through hole in the exsiccator 3, distribution grid 4 is arranged on the bottom in the exsiccator 3, drying agent is placed on the distribution grid 4, have the inlet of placing drying agent on exsiccator 3, inlet is by sealing-plug 2 sealings.One end of T-valve 1 is connected with exsiccator 3, and the other end is connected with vacuum generator 8, and the 3rd end is the tested media inlet, and the other end of exsiccator 3 is connected with flask 6 by retaining valve 5, and the side pipe of flask 6 is connected with vacuum meter 7.

Tested object:

The moisture content of process gas in the pipe tobacco pneumatic conveying drying process is tested the moisture content under two states, i.e. two kinds of situations of operate as normal and fictitious load.It is the analytical balance of 0.001g that the mensuration of quality needs precision.

During operate as normal:

When measuring, 1, earlier measure T-valve 1, exsiccator 3 and retaining valve 5 quality and, note is made w1, w1=260.900g;

2, adjust T-valve 1, vacuum generator 8 is communicated with exsiccator 3, retaining valve 5 is opened, utilize 8 pairs of total systems of vacuum generator to vacuumize, and be extracted into vacuum meter 7 and show and adjust T-valve 1 when readings are 0.05～0.08MPa, disconnection exsiccator 3 is communicated with vacuum generator 8, vacuum generator 8 cuts out, and is in connected state between flask 6 and the vacuum meter 7 always, and vacuum tightness is designated as P1 at this moment; P1=0.053MPa, conversion back pressure is 0.47bar.

3, adjust T-valve 1, the medium inlet end of T-valve 1 is communicated with vacuum generator 8, the medium inlet end is connected with the measured medium outlet, open vacuum generator (8), measured medium is drawn, after 10～30 seconds, adjust T-valve 1 again, the medium inlet end is communicated with exsiccator 3, close vacuum generator 8,, make T-valve 1 and the sealing of exsiccator 3 links when vacuum meter 7 is shown as 0～0.01MPa, stop sampling, vacuum tightness is designated as P2 at this moment; P2=0.0055MPa, conversion back pressure is 0.945bar.

4, close retaining valve 5, disconnect exsiccator 3 and is connected with flask 6, the quality of measuring T-valve 1 exsiccator 3 and retaining valve 5 with, remember and make w2; W2=264.400g.

5, calculate H according to following formula ₂O volume content (%):

$H_{2}O\%=\frac{\frac{w2-w1}{18}}{(P2-P1)\frac{V}{\mathrm{RT}}+\frac{w2-w1}{18}}\×100\%$

W1, w2, P1, P2 are test value; Wherein as if vacuum tightness P1, the unit of P2 should be converted to crust (bar) when being MPa (MPa);

V is the volume of total system, i.e. volume behind the following shared volume of entire portion deduction drying agent in T-valve 1 and the junction of exsiccator 3, and unit is for rising; V=2.606l

R is a gas law constant; R=0.082barl/molK;

T is an ambient temperature value, and unit is K

The process gas temperature is 320 ℃, and environment temperature is 27 ℃ of ≈ 300K

Therefore calculate and to get, calculate $H_{2}O\%=\frac{\frac{w2-w1}{18}}{(P2-P1)\frac{V}{\mathrm{RT}}+\frac{w2-w1}{18}}\×100\%=79.442\%.$

Test duration was less than 3 minutes.

During fictitious load:

When measuring, 1, earlier measure T-valve 1, exsiccator 3 and retaining valve 5 quality and, note is made w1, w1=259.272g;

2, adjust T-valve 1, vacuum generator 8 is communicated with exsiccator 3, retaining valve 5 is opened, utilize 8 pairs of total systems of vacuum generator to vacuumize, and be extracted into vacuum meter 7 and show and adjust T-valve 1 when readings are 0.05～0.08MPa, disconnection exsiccator 3 is communicated with vacuum generator 8, vacuum generator 8 cuts out, and is in connected state between flask 6 and the vacuum meter 7 always, and vacuum tightness is designated as P1 at this moment; P1=0.047MPa, conversion back pressure is 0.53bar.3, adjust T-valve 1, the medium inlet end of T-valve 1 is communicated with vacuum generator 8, the medium inlet end is connected with the measured medium outlet, open vacuum generator (8), measured medium is drawn, after 10～30 seconds, adjust T-valve 1 again, the medium inlet end is communicated with exsiccator 3, close vacuum generator 8,, make T-valve 1 and the sealing of exsiccator 3 links when vacuum meter 7 is shown as 0～0.01MPa, stop sampling, vacuum tightness is designated as P2 at this moment; P2=0.011MPa, conversion back pressure is 0.89bar.

4, close retaining valve 5, disconnect exsiccator 3 and is connected with flask 6, the quality of measuring T-valve 1 exsiccator 3 and retaining valve 5 with, remember and make w2; W2=261.268g

5, calculate H according to following formula ₂O volume content (%):

$H_{2}O\%=\frac{\frac{w2-w1}{18}}{(P2-P1)\frac{V}{\mathrm{RT}}+\frac{w2-w1}{18}}\×100\%$

W1, w2, P1, P2 are test value; Wherein if vacuum tightness P1, the unit of P2 is MPa (MPa), the time should be converted to crust (bar);

V is the volume of total system, i.e. volume behind the following shared volume of entire portion deduction drying agent in T-valve 1 and the junction of exsiccator 3, and unit is for rising; V=2.606l

R is a gas law constant; R=0.082barl/molK;

T is an ambient temperature value, and unit is K;

The process gas temperature is 312 ℃, and environment temperature is 27 ℃ of ≈ 300K

Therefore calculate and to get, calculate $H_{2}O\%=\frac{\frac{w2-w1}{18}}{(P2-P1)\frac{V}{\mathrm{RT}}+\frac{w2-w1}{18}}\×100\%=74.409\%.$

Test duration was less than 3 minutes.

In the present invention, P1, P2 are test value, are unit if vacuum meter is direct Israel and Palestine (bar), then do not need conversion to calculate.

As can be seen, the test duration of the present invention is shorter from the foregoing description, and test mode is convenient to operation, and test accuracy is higher.

Claims (3)

1. instrument of measuring humidity ratio of treatment media, it is characterized in that: comprising: T-valve (1), vacuum generator (8), flask (6), retaining valve (5), exsiccator (3) and vacuum meter (7), in exsiccator (3), be placed with drying agent, one end of T-valve (1) is connected with exsiccator (3), the other end is connected with vacuum generator (8), the 3rd end is the tested media inlet, the other end of exsiccator (3) is connected with flask (6) by retaining valve (5), and the side pipe of flask (6) is connected with vacuum meter (7).

2. the instrument of mensuration humidity ratio of treatment media according to claim 1, it is characterized in that: be provided with the distribution grid (4) that has through hole in the described exsiccator (3), distribution grid (4) is arranged on the bottom in the exsiccator (3), drying agent is placed on the distribution grid (4), have the inlet of placing drying agent on exsiccator (3), described inlet is by sealing-plug (2) sealing.

3. utilize the assay method of the instrument of claim 1 or 2 described mensuration humidity ratio of treatment media, it is characterized in that: comprise the steps:

A, measure T-valve (1), exsiccator (3) and retaining valve (5) quality and, remember and make w1;

B, adjustment T-valve (1), vacuum generator (8) is communicated with exsiccator (3), retaining valve (5) is opened, utilize vacuum generator (8) that total system is vacuumized, and be extracted into vacuum meter (7) and show and to adjust T-valve (1) when reading is 0.05～0.08MPa, disconnection exsiccator (3) is communicated with vacuum generator (8), vacuum generator (8) cuts out, and is in connected state between flask (6) and the vacuum meter (7) always, and vacuum tightness is designated as P1 at this moment;

C, adjustment T-valve (1), the medium inlet end of T-valve (1) is communicated with vacuum generator (8), the medium inlet end is connected with the measured medium outlet, open vacuum generator (8), measured medium is drawn, after 10～30 seconds, adjust T-valve (1) again, the medium inlet end is communicated with exsiccator (3), close vacuum generator (8),, make T-valve (1) and the sealing of exsiccator (3) link when vacuum meter (7) is shown as 0～0.01MPa, stop sampling, vacuum tightness is designated as P2 at this moment;

D, close retaining valve (5), disconnect exsiccator (3) and is connected with flask (6), the quality of measuring T-valve (1) exsiccator (3) and retaining valve (5) with, remember and make w2;

E, calculate H according to following formula ₂O volume content (%):

$H_{2}O\%=\frac{\frac{w2-w1}{18}}{(P2-P1)\frac{V}{\mathrm{RT}}+\frac{w2-w1}{18}}\×100\%$

W1, w2, P1, P2 are test value; If wherein vacuum tightness P1, the unit of P2 should be converted to bar during for MPa;

V is the volume of total system, and unit is 1;

R is a gas law constant; R=0.082barl/molK

T is an ambient temperature value, and unit is K.