CN102221509A - Method for compensating measuring concentration of oscillation balance - Google Patents

Abstract

The invention relates to an environmental protection monitoring instrument, in particular to a method for compensating the measuring concentration of an oscillation balance. The invention provides a humidity compensating method and device based on a formula, i.e., delta M=delta P-(delta W-delta D) to compensate relative humidity of the measuring concentration of the oscillation balance, wherein delta P refers to the weight increment of a sampling film; delta W refers to the mass of water carried by humid gas within a period of time t; and delta D refers to the mass of water carried away by gas within a period of time t. The method has the advantage that: the relative humidity of the measuring concentration of the oscillation balance can be compensated in time, so that a monitoring result is more accurate.

Description

A kind of method that compensates vibration balance measurement concentration

Technical field

The present invention relates to a kind of environment protection and monitoring instrument, particularly about a kind of method that compensates vibration balance measurement concentration.

Background technology

Negative value can appear in the concentration of vibration balance behind rain at present, badly influences monitoring result.And in southern area of heavy rainfull, the appearance of this negative concentration more can occur for a long time.Therefore solving this negative concentration phenomenon helps the precise monitoring result.

Summary of the invention

The present invention solves the concentration of existing in prior technology vibration balance behind rain negative value can occur, badly influences monitoring result, and in southern area of heavy rainfull, the technical matters that the appearance of this negative concentration more can occur etc. for a long time; Provide a kind of can be timely relative humidity during to vibration balance measurement concentration compensate, thereby make the more accurate a kind of method that compensates vibration balance measurement concentration of monitoring result.

Above-mentioned technical matters of the present invention is mainly solved by following technical proposals:

A kind of method that compensates vibration balance measurement concentration is characterized in that may further comprise the steps: it is t that the duration of bleeding is set, and following steps are all finished in the t duration;

Step 1 is measured the weightening finish Δ P of sampling film by sampling film weightening finish measuring appliance

Step 2 is measured industrial and mineral flow Q before the sampling film of t duration by the industrial and mineral flow measuring probe ₁And industrial and mineral flow Q behind the sampling film ₂

Step 3 is measured in the t duration saturated steam air pressure P before the sampling film by pressure transducer ₁And saturated steam air pressure P behind the sampling film ₂

Step 4 is measured the relative humidity U before the sampling film in the t duration by humidity sensor ₁And the relative humidity U behind the sampling film ₂

Step 5 is measured the scene temperature T before the sampling film in the t duration by temperature sensor ₁And the scene temperature T behind the sampling film ₂

Step 6 is obtained the quality Δ W of the water that moisture carries and the quality Δ D of the water that gas is taken away respectively by the steam measuring appliance;

Step 7 is obtained the weightening finish Δ M of airborne dust by the airborne dust measuring appliance.

In above-mentioned a kind of method that compensates vibration balance measurement concentration, in the described step 6, the method for obtaining the quality Δ W of the water that moisture carries is based on formula:

$\mathrm{\ΔW}=2.166\×Q_1\×{\∫}_0^t\frac{P_1\×U_1}{T_1}d\left(t\right).$

In above-mentioned a kind of method that compensates vibration balance measurement concentration, the quality Δ D that obtains the water that gas takes away is based on formula:

$\mathrm{\ΔD}=2.166\×Q_2\×{\∫}_0^t\frac{P_2\×U_2}{T_2}d\left(t\right).$

In above-mentioned a kind of method that compensates vibration balance measurement concentration, obtaining of described weightening finish Δ M is based on formula:

ΔM＝ΔP-(ΔW-ΔD)。

Therefore, the present invention has following advantage: can be timely relative humidity during to vibration balance measurement concentration compensate, thereby make monitoring result more accurate.

Embodiment

Below by embodiment, technical scheme of the present invention is described in further detail.

Embodiment:

The method of compensation of the present invention vibration balance measurement concentration at first, is placed on the two ends up and down of vibration balance with temperature sensor, is used for the acquisition environment temperature; Humidity sensor is placed vibration balance two ends up and down, is used for the acquisition environment temperature; Pressure transducer vibration day placing flat is two ends up and down, are used for the detection pressure value;

The present invention carries out according to following three formula:

$\mathrm{\ΔW}=2.166\×Q_1\×{\∫}_0^t\frac{P_1\×U_1}{T_1}d\left(t\right);$

$\mathrm{\ΔD}=2.166\×Q_2\×{\∫}_0^t\frac{P_2\×U_2}{T_2}d\left(t\right);$

ΔM＝ΔP-(ΔW-ΔD)；

Wherein, industrial and mineral flow Q before the sampling film of the weightening finish Δ P of sampling film, t duration ₁, industrial and mineral flow Q behind the sampling film in the t duration ₂, saturated steam air pressure P before the sampling film in the t duration ₁, saturated steam air pressure P behind the sampling film in the t duration ₂, the relative humidity U in the t duration before the sampling film ₁, the relative humidity U in the t duration behind the sampling film ₂, the scene temperature T in the t duration before the sampling film ₁, the scene temperature T in the t duration behind the sampling film ₂, moisture carries in the t duration water quality Δ W, t duration in the quality Δ D of the water taken away of gas.

The following derivation of above-mentioned formula down of setting forth earlier:

1, the computing formula of the quality of water is derived in the gas:

The definition of relative humidity: the number percent of the molal quantity of saturated steam or be the ratio of the water vapor pressure in the gas and the Saturated water vapor pressure of its gas/represent under the molal quantity of water vapor and uniform temp and the pressure condition in the moisture with number percent.

Get:

Therefore: M _{The actual mol of T}=U _RH* M _{The saturated mol of T}

And the quality of water: M _g=M _{Actual mol}* 18g/mol=U _RH* M _{The saturated mol of T}* 18g/mol;

Irrelevant because Saturated water vapor pressure just has relation with temperature with air pressure, therefore need measure field temperature and relative humidity.Under standard state:

Calculating under mark condition condition:

Know that by equation of gaseous state under off-rating, the volume of 1mol gas is:

Therefore under off-rating, the computing formula of the quality of the water in the gas is as follows:

Here, the approximate value 2.166 that we get in the actual mechanical process, can be got more high-order fractional value according to user's requirement.

2, the Mass Calculation derivation of equation of residuary water on the sampling film:

Duration is t if bleed, and the weightening finish of vibration balance measurement film is Δ P.At this moment film weightening finish Δ P derives from three aspects, and one is the weightening finish Δ M of dirt, and one is the water Δ W that moisture carries, and another is the water Δ D that gas is taken away.Be: Δ P=Δ M+ Δ W-Δ D, i.e. Δ M=Δ P-(Δ W-Δ D); Concrete account form is as follows:

The present invention is by the characteristics of the above-mentioned derivation of equation and combination vibration balance, by respectively install a relative Temperature Humidity Sensor additional before film with behind the film, measure before the film and relative humidity and temperature behind the film, and instrument itself can be measured flow.Therefore can calculate the quality weightening finish of the dirt of realization by above-mentioned formula.

We can see that the weightening finish of dirt does not equal the weightening finish of film when having this compensation, i.e. negative concentration appears in Δ P=Δ M when Δ P＜0.Be analyzed as follows by humidity compensate:

Because Δ P=Δ M+ Δ W-Δ D;

Again because of dirt weightening finish Δ M＞0, because Δ P＜0, i.e. Δ D＞Δ M+ Δ W;

Because Δ W＞0 in surrounding air obtains Δ D＞Δ M, Δ D＞Δ W;

Therefore when the moisture content number of dropouts on film surface during greater than the weightening finish sum of the dirt on the diaphragm and the water that enters diaphragm increase weight and show as negative value, so the weightening finish that instrument records when not having this compensation is a negative value, then concentration also is negative value, but actual value is not a negative value.

The situation of the negative concentration of this appearance will occur when must be in the relative humidity variations of environment big, when particularly raining, also has when the diaphragm of changing relatively during humidity, also can occur.But can both obtain correcting by this compensation.

Specific embodiment described herein only is that the present invention's spirit is illustrated.The technician of the technical field of the invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.

Although this paper has used terms such as sampling film weightening finish measuring appliance, industrial and mineral flow measuring probe, pressure transducer, humidity sensor, temperature sensor, steam measuring appliance, airborne dust measuring appliance morely, do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain essence of the present invention more easily; They are construed to any additional restriction all is contrary with spirit of the present invention.

Claims (4)

1. a method that compensates vibration balance measurement concentration is characterized in that, may further comprise the steps: it is t that the duration of bleeding is set, and following steps are all finished in the t duration:

Step 1 is measured the weightening finish Δ P of sampling film by sampling film weightening finish measuring appliance;

Step 2 is measured industrial and mineral flow Q before the sampling film in the t duration by the industrial and mineral flow measuring probe ₁And industrial and mineral flow Q behind the sampling film ₂

Step 3 is measured in the t duration saturated steam air pressure P before the sampling film by pressure transducer ₁And saturated steam air pressure P behind the sampling film ₂

Step 4 is measured the relative humidity U before the sampling film in the t duration by humidity sensor ₁And the relative humidity U behind the sampling film ₂

Step 5 is measured the scene temperature T before the sampling film in the t duration by temperature sensor ₁And the scene temperature T behind the sampling film ₂

Step 6 is obtained the quality Δ D of the quality Δ W of the water that moisture carries in the t duration and the water that gas is taken away respectively by the steam measuring appliance;

Step 7 is obtained the weightening finish Δ M of airborne dust in the t duration by the airborne dust measuring appliance.

2. a kind of method that compensates vibration balance measurement concentration according to claim 1 is characterized in that, in the described step 6, the method for obtaining the quality Δ W of the water that moisture carries is based on formula:

$\mathrm{\ΔW}=2.166\×Q_1\×{\∫}_0^t\frac{P_1\×U_1}{T_1}d\left(t\right).$

3. a kind of method that compensates vibration balance measurement concentration according to claim 1 is characterized in that, the quality Δ D that obtains the water that gas takes away is based on formula:

$\mathrm{\ΔD}=2.166\×Q_2\×{\∫}_0^t\frac{P_2\×U_2}{T_2}d\left(t\right).$

4. a kind of method that compensates vibration balance measurement concentration according to claim 1 is characterized in that obtaining of described weightening finish Δ M is based on formula:

ΔM＝ΔP-(ΔW-ΔD)。