CN101676700B - Pressure measurement anti-blockage method and sampling device for anti-blockage measurement - Google Patents

Abstract

The invention relates to a method and sampling device for anti-blockage pressure measurement in dusty condition which adopts changed diameter adjusting sampling valve with adjustable section as the main part; in order to prevent the dust particles in a furnace to block a pressure measurement sampling tube, a self-operated flow adjusting valve is used to adjust a certain amount of gas to blow the pressure measurement sampling tube, the flow rate is controlled to 0.5-1.5m<3>/h, the measurement error is caused by the gas resistance which can reach 30-150 H2Omm generally of a pressure measurement extraction tube, and the measurement error can be overcome by a changed diameter adjusting valve so that the measured pressure of the sampling tube is equal to the actual pressure in the furnace and not affected by the flow change of the gas, thus the pressure in the furnace can be accurately measured. The method and device have reliable operation and convenient adjustment, the measurement accuracy is 1 H2Ommand the device can not be blocked.

Description

The tonometric sampler of anti-clogging pressure measurement method and anti-clogging

Technical field

The present invention relates to a kind of reducing by variable-area and regulate many dirt state pressure (negative pressure) measurement anti-blockage method and the device that sample valve is formed, is dividing an application of No. 99125568.2 applications for a patent for invention.

Background technology

At present many dirt, the easy obstruction in the pressure survey of measuring pipeline, as the stove that uses in chemical engineering industry, building materials industry, the petroleum industry, ebullated bed, fluidized bed, sand stove etc., because the solid particle dust in the siege is in high temperature and fluidized state about 1000 ℃, pressure test point and pipeline very easily stop up, and influence is operation normally.And in case obstruction has to use artificial the purging when stopping to measure.Sometimes adopt the method that in pipeline, feeds a small amount of gas continuously, be splashed into obstruction to prevent dust granule, but caused test error simultaneously.The big more then error of gas flow is big more, and usually error is up to 5～10%, thereby can not control the stove device exactly and move under normal operating mode, influenced the work efficiency of device and strengthened energy resource consumption.Up to the present the document patent and the product that still do not have solution.

Summary of the invention

The invention provides a kind of reliable, easy to adjust, measuring accuracy is high, nonclogging pressure-measuring system method and the tonometric sampler of anti-clogging.Be fit to the pressure survey of siege under the various severe environmental conditions.Measuring error can reduce an order of magnitude (more than 10 times).

According to an aspect of the present invention, provide a kind of anti-clogging tonometric sampler, having comprised:

Measure fairlead 2 for one, the inner of this measurement fairlead 2 passes in the stove 1 for the treatment of pressure measurement, and the outer end connects a reducing with thief hole 4 and regulates sample valve 3.

This reducing is regulated flowmeter 6 and the tensimeter 5 of sample valve 3 by pipeline and measurement gas flow and pressure, and continuous in order to the flow control valve 7 of relying on oneself of adjusting gas flow, the gas at thief hole 4 places of this reducing adjusting sample valve 3 of flowing through can be regulated sample valve 3 by reducing by the cross section and regulate;

A pressure unit is regulated the pressure at thief hole 4 places of sample valve 3 in order to flow through this reducing of measurement.

According to a further aspect in the invention, provide a kind of pressure measurement anti-blockage method, may further comprise the steps:

Measuring fairlead with one passes in the stove for the treatment of pressure measurement;

The outer end of this measurement fairlead is connected a reducing adjusting sample valve with thief hole; The gas of adjusting the thief hole place of this reducing adjusting sample valve passes through the cross section, and the gaging pressure at thief hole place is equated with the internal pressure of stove, and the pressure of measuring sampling spot is the interior pressure of stove.

To be installed in this reducing in order to the flowmeter of measurement gas flow and pressure and tensimeter and in order to the flow control valve of relying on oneself of adjusting gas flow in the pipeline and regulate on the pipeline that sample valve is connected, the gas of adjusting the thief hole place of this reducing adjusting sample valve passes through the cross section;

Adopt pressure transmitter measurement this reducing of flowing through to regulate the pressure of gas at the thief hole place of sample valve, this pressure that records is the interior pressure of this stove.

Description of drawings

Fig. 1 is the system diagram that many dirt of the present invention state downforce is measured anti-blockage method.

Fig. 2 is the structural representation that reducing shown in Figure 1 is regulated the first kind of structure-side valve type reducing sample valve of sample valve.

Fig. 3 is the structural representation that reducing shown in Figure 1 is regulated the second kind of structure-pin type reducing sample valve of sample valve.

Fig. 4 is the structural representation that reducing shown in Figure 1 is regulated the third structure-rotary valve reducing sample valve of sample valve.

Embodiment

Below in conjunction with the drawings and specific embodiments the present invention is described in further details.

As shown in Figure 1, measuring the pass through cross section of fairlead 2 outer ends, make the dynamic pressure of gas equate that with the air resistance of fairlead part the pressure of measurement sampling spot is the true pressure in the stove by reducing adjusting sample valve 3 change gases.Measure gas flow in the fairlead by factor decisions such as the grain size of dust in the stove and flowing velocities, flow control valve 7 is adjusted by relying on oneself.This flow control valve 7 of relying on oneself is used for the flow of the gas in the control survey fairlead 2, and the flow velocity in the holding tube is not subjected to the variation of gaging pressure to cause the variation of flow, prevents this line clogging.Flowmeter 6, tensimeter 5 are read the flow and the pressure of gas.

The gas that feeds is set up by the flow control valve 7 of relying on oneself and is required flow, is shown by flowmeter 6.Gas is measured the interior also while of II-II cross section inflow stove of fairlead 2 and is regulated by reducing through the I-I cross section of reducing adjusting sample valve 3 SamplingThief hole 4 is delivered to pressure transmitter measurement by the road in the valve 3.

If: reducing is regulated the cross section I-I at thief hole 4 places of sample valve 3, the area of section at measurement fairlead section II-II place of an end in stove is respectively S ₁And S ₂, pressure is respectively P ₁And P ₂, flow velocity is respectively v ₁And v ₂, highly be respectively Z ₁And Z ₂, γ is a gas severe.

Cross section I-I is ξ to the pipe resistance coefficient between section II-II, and resistance consumption can be hw.

Relation between above-mentioned each parameter satisfies Bernoulli equation:

$\frac{P_1}{\mathrm{\&gamma;}}+\frac{{v_1}^2}{2g}+Z_1=\frac{{\mathrm{<figure-callout\; id="2"\; label="P"\; filenames="H200810176766XE00011.png,H200810176766XE00012.png"\; state="\{\{state\}\}">P</figure-callout>}}_2}{\mathrm{\&gamma;}}+\frac{{v_2}^2}{2g}+{\mathrm{<figure-callout\; id="2"\; label="Z"\; filenames="H200810176766XE00011.png,H200810176766XE00012.png"\; state="\{\{state\}\}">Z</figure-callout>}}_2+\mathrm{hw}......\left(1\right)$

Referring to Fig. 1 as can be known, cross section I-I and section II-II are in the two ends of measuring fairlead 2 respectively, and it is a series pipe, so the flow of these two sections equates.

Through testing, the inventor finds, passes through area of section as long as the change reducing is regulated the gas at thief hole 4 places of sample valve 3, makes the gas flow rate v at the I-I place, this cross section that flows through ₁And the gas flow rate v at this section II-II place that flows through ₂Satisfy $v_1={\mathrm{<figure-callout\; id="2"\; label="v"\; filenames="H200810176766XE00011.png,H200810176766XE00012.png"\; state="\{\{state\}\}">v</figure-callout>}}_2\sqrt{1+\mathrm{\&xi;}}$ (formula (2)), the pressure P at I-I place, this cross section ₁Promptly equal the pressure P at section II-II place ₂, and be not subjected to the influence of gas flow in the pipeline.In other words, in the case, the P that records by pressure unit ₂It is exactly the pressure P in the stove ₁

Wherein, v ₁, v ₁, ξ can measure by known any method.

According to a preferred embodiment of the present invention, what be installed in that the reducing of measuring end outside the fairlead 2 regulates that sample valve 3 adopts is a kind of structure of guiding valve, as shown in Figure 2, this guiding valve comprises spool (9a) and nut (10a), this spool (9a) is processed with wide 3 millimeters skewed slot vertically at outside surface, by handling nut (10a), can promote this spool (9a) and move 20 millimeters vertically, the change that moves axially of spool (9a) is regulated the gas that the thief hole (4) of sample valve (3) locates through this reducing and is passed through the cross section.

What according to another preferred embodiment of the invention, be installed in that the reducing of measuring end outside the fairlead 2 regulates that sample valve 3 adopts is a kind of structure of needle-valve.As shown in Figure 3, this needle-valve comprises spool (9b) and valve seat (10b), the external process of this spool (9b) has screw thread, by twisting spool (9b), change the awl end of spool (9b) and the distance between the valve seat (10b), pass through the cross section thereby change the gas of locating through the thief hole (4) of this reducing adjusting sample valve (3).

According to another preferred embodiment of the present invention, what be installed in that the reducing of measuring end outside the fairlead 2 regulates that sample valve 3 adopts is a kind of structure of rotary valve.As shown in Figure 4, this rotary valve comprises spool (9c) and valve body (8c), this spool (9c) is a cylinder rotatable, go up the corresponding inclined to one side circular hole that is processed with at this spool (9c) and valve body (8c), change the gas of locating through the thief hole (4) of this reducing adjusting sample valve (3) by rotational valve core (9c) and pass through the cross section.

Claims (9)

1. anti-clogging pressure measurement method may further comprise the steps:

Measuring fairlead with one passes in the stove for the treatment of pressure measurement;

The outer end of this measurement fairlead is connected a reducing adjusting sample valve with thief hole;

The gas of adjusting the thief hole place of described reducing adjusting sample valve passes through the cross section, and the gaging pressure at thief hole place is equated with the internal pressure of stove, and the pressure of measuring sampling spot is the interior pressure of stove.

2. anti-clogging pressure measurement method according to claim 1 adopts external pressure unit to measure the pressure that described reducing is regulated the thief hole place of sample valve.

3. anti-clogging pressure measurement method according to claim 1 and 2, to be installed in order to the flow control valve of relying on oneself of adjusting gas flow in the pipeline with this reducing and regulate on the pipeline that sample valve is connected, the flow of the gas in the described measurement fairlead of this Flux Valve Control of relying on oneself makes it not to be subjected to the variation of gaging pressure and changes.

4. tonometric sampler of anti-clogging comprises:

Measure fairlead for one, the inner of this measurement fairlead passes in the stove for the treatment of pressure measurement, and the outer end connects a reducing with thief hole and regulates sample valve; The gas that described reducing is regulated the thief hole place of sample valve is variable by the cross section.

5. the tonometric sampler of anti-clogging according to claim 4, it is characterized in that comprising the flow control valve of relying on oneself that is installed on the pipeline that is connected with described reducing adjusting sample valve in order to gas flow in the adjustment pipeline, the flow of the gas in the described measurement fairlead of this Flux Valve Control of relying on oneself makes it not to be subjected to the variation of gaging pressure and changes.

6. according to claim 4 or the tonometric sampler of 5 described anti-cloggings, it is characterized in that being included in the external pressure unit of thief hole place that described reducing is regulated sample valve, in order to measure the pressure at this thief hole place.

7. according to claim 4 or the tonometric sampler of 5 described anti-cloggings, it is characterized in that described reducing adjusting sample valve adopts the structure of guiding valve, this guiding valve comprises spool, valve body and the nut that is threaded with described valve body vertically, this spool is processed with wide 3 millimeters skewed slot vertically at outside surface, by handling nut, can promote this spool and move 20 millimeters vertically, the gas that moves axially the thief hole place that changes described reducing adjusting sample valve of spool passes through the cross section.

8. according to claim 4 or the tonometric sampler of 5 described anti-cloggings, it is characterized in that described reducing adjusting sample valve adopts the structure of needle-valve, this needle-valve comprises spool, valve body and valve seat, the external process of this spool has screw thread to be connected with corresponding internal thread on the valve body, make it moving axially by the twisting spool along valve body, change the awl end of spool and the distance between the valve seat, thereby the gas that changes the thief hole place of described reducing adjusting sample valve passes through the cross section.

9. according to claim 4 or the tonometric sampler of 5 described anti-cloggings, it is characterized in that described reducing adjusting sample valve adopts the structure of rotary valve, this rotary valve comprises spool and valve body, this spool is a cylinder rotatable, correspondingly on described spool and valve body be processed with inclined to one side circular hole, change described reducing by rotational valve core and regulate the gas at the thief hole place of sample valve and pass through the cross section.

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