CN101477020B - Method for measuring slurry density of desulfurizing absorption column - Google Patents
Method for measuring slurry density of desulfurizing absorption column Download PDFInfo
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- CN101477020B CN101477020B CN200910076640XA CN200910076640A CN101477020B CN 101477020 B CN101477020 B CN 101477020B CN 200910076640X A CN200910076640X A CN 200910076640XA CN 200910076640 A CN200910076640 A CN 200910076640A CN 101477020 B CN101477020 B CN 101477020B
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Abstract
The present invention relates to a method for measuring density of slurry in a desulfurization absorption tower, which comprises the following steps: firstly selecting a low-pressure side pressure sampling point and a high-pressure side pressure sampling point in the vertical direction of an absorption tower body, then leading out sampling pipe sections from the high-pressure side pressure sampling point and the low-pressure side pressure sampling point respectively, next connecting a high-pressure side capillary tube and a low-pressure side capillary tube of a double-flange diaphragm differential pressure transmitter to a sampling pipe section respectively, and finally calculating a density value by a measured value delta P of the double-flange diaphragm differential pressure transmitter according to a formula rho1=(delta P + rho2 gh)/(gh), wherein in the formula, rho1 is the density of the slurry in the absorption tower, rho2 is the density of the filling liquid in the capillary tube, g is gravitational acceleration, and h is the altitude difference between the high-pressure side pressure sampling point and the low-pressure side pressure sampling point. The method can measure more conveniently and accurately, needs no complex operation or measures, can simply maintain corresponding used measuring equipment and devices with low cost, and ensure stable and reliable running of the measuring equipment and the devices.
Description
Technical field
The present invention relates to a kind of method that is used for measuring slurry density of desulfurizing absorption column at wet method fume desulfurizing system.
Background technology
At present domestic on power plant's wet desulphurization project, basically adopt for the measurement of absorption tower gypsum slurries density and on the gypsum slurries discharge line, to carry out the on-line measurement scheme, measuring equipment adopts the coriolis force densitometer, its principle of work is: adopt to make the mode of measuring tube vibration realize the effect of coriolis force to measuring tube, and make measuring tube produce displacement under the effect of coriolis force.Because the two ends of measuring tube are fixed, the power of each point is different on the measuring tube and act on, and caused displacement also has nothing in common with each other, and therefore forms an additional distortion on measuring tube.Measure the phase differential of process on difference of this distortion, just can obtain flowing through the mass rate of the fluid of measuring tube.But owing to be subjected to the restriction of desulfurization slurry characteristic, this density measure scheme all has higher requirements for installing, debug, moving.Installing the straight length that requires assurance densitometer upstream that 5 times of process pipe diameters should be arranged at least, the downstream should have the straight length of 2 times of process pipe diameters at least; In the restriction (it is 1-2m/s that general flow restriction requires) that owing to densitometer the slurries of the measuring tube of flowing through is had flow velocity aspect debugging and the operation, bypass valve must be regulated or restriction orifice carries out limited flow rate, after valve opening diminishes, owing to what flow through is the gypsum or the lime slurry of concentration higher (about 25%), cause the obstruction of bypass valve or densimeter measurement pipe easily, when bypass valve stops up, the densitometric flow velocity of flowing through strengthens, can cause densitometric wearing and tearing, when the densitometer fouling is stopped up, must wash, therefore the operation maintenance personnel should often go to observe the variation of this measured value, frequent again washes, so that density measure can't reach continuously and be stable.From the ruuning situation most of power plant desulfurization system of this density measure scheme in recent years, measure problem such as unstable, that wearing and tearing are very fast, operation maintenance is loaded down with trivial details and constantly occur.And the measurement of absorption tower gypsum slurries density also directly affects the method for operation and the quality of gypsum and the quality of dehydrating effect of gypsum vacuum belt dewaterer simultaneously for judging that gypsum crystal generation, growth and absorption tower fouling prevention have very big effect.
A kind of method by the differential pressure measurement slurry density of desulfurizing absorption column is disclosed among this external CN 1963449A, wherein use single pressure unit to measure the pressure at different measuring point place on the absorption tower, subtract each other acquisition pressure reduction by the force value that makes pressure unit then, and then calculate density value.In this method, the bulk density value needs the measured value of two pressure units at least, and this will make the measuring error of two differential pressure transmitters superimposed, causes the density value precision that calculates not enough.In addition, in the document, do not mention the concrete enforcement structure of sampling and device for pressure measurement fully yet, do not have to consider how to avoid the error of measuring system own to improve density accuracy yet, and how to eliminate slurries crystallization and fouling influence sampling and device for pressure measurement by suitable calculative strategy.
Equally, also mentioned a kind of method of calculating slurry density of desulfurizing absorption column by differential manometer at " magnificent power technology " article of the 3rd phase in 2008 " optimal design of wet process of FGD control system and application ", and it is the same with above-mentioned document CN 1963449A, the measuring error of two pressure units has superposeed in its computing method, do not mention the concrete enforcement structure of sampling and device for pressure measurement too fully, do not have to consider how to avoid the error of measuring system own to improve density accuracy yet, and how to eliminate slurries crystallization and fouling influence sampling and device for pressure measurement by suitable calculative strategy.
Summary of the invention
The objective of the invention is to improve the method for the measurement slurry density of desulfurizing absorption column that uses in the prior art, in the above-mentioned shortcoming that in overcoming prior art, exists, a kind of method of can be convenient and accurately measuring is provided, it need not complicated operations and measure, can be simply and safeguard the sampling and the device for pressure measurement of corresponding use inexpensively, guarantee its continual and steady and operation reliably, the error of effectively avoiding measuring system itself by the suitable layout and the calculative strategy of measuring system is to the influence of measurement result and final densities value simultaneously.
According to the present invention, above-mentioned task realizes by following scheme, it comprises following method step: at first, choose at least one low-pressure lateral pressure sampling spot and at least one high side pressure sampling spot in vertical direction along the body of the tower on absorption tower, draw the sampling pipeline section from high side pressure sampling spot and low-pressure lateral pressure sampling spot respectively then, then the high pressure side capillary tube and the low pressure side capillary tube of two flange barrier film differential pressure transmitters are received respectively on the sampling pipeline section of high side pressure sampling spot and low-pressure lateral pressure sampling spot, last measured value Δ P by two flange barrier film differential pressure transmitters is according to formula ρ
1=(Δ P+ ρ
2Gh)/(gh) calculate density value.In the above-mentioned density calculation formula, ρ
1Be absorption tower serum density, ρ
2Be the kapillary filling liquid density of two flange barrier film differential pressure transmitters, g is an acceleration of gravity, and h is the difference in height between high side pressure sampling spot and the low-pressure lateral pressure sampling spot.
Adopt two flange barrier film differential pressure transmitters to measure the pressure reduction of two pressure samples points in the present invention, systematic error mainly is present in a two flange barrier film differential pressure transmitter thus, the problem that does not have the error stack, thereby reduced the inherent error of measuring system itself, in addition in conjunction with the corresponding structure measure, use two flange barrier film differential pressure transmitters to make measuring operation easier, and convenient reliable to the cleaning of sampling pipeline section.
According to preferred version of the present invention,, be full of the deviation ρ that the liquid deadweight causes to eliminate kapillary to revising the zero point of two flange barrier film differential pressure transmitters
2Gh, and get ρ
2The above-mentioned density calculation formula of gh=0 substitution, obtain thus simplifying but still keep simultaneously the density calculation formula ρ of degree of accuracy
1=Δ P
1/ (gh), Δ P wherein
1Thereby expression is full of the deviation ρ that the liquid deadweight causes to revising the elimination kapillary zero point of two flange barrier film differential pressure transmitters
2The measured value of differential pressure transmitter behind the gh.
In addition according to preferred version of the present invention, high pressure side capillary tube and the low pressure side capillary tube of choosing two flange barrier film differential pressure transmitters are equal length, like this when absorption tower slurries level fluctuation build-up of pressure changes, the pressure conduction time that guarantees high-pressure side and low-pressure side is suitable substantially, avoids because the kapillary filling liquid pressure conduction time difference causes measuring error.Thereby also reduced the inherent error of measuring system itself, can simplyr calculate density value exactly.
In addition, for obtaining pressure measuring value and density calculation value more accurately, high and low pressure side pressure samples point should be selected according to following principle, promptly should avoid the higher bottom section of serum density in the absorption tower and avoid the unsettled zone of slurry, and select that slurry is stable, density zone uniformly.The distance that for example preferred high side pressure sampling spot arrives the bottom, absorption tower most preferably is taken as 0.5m, to avoid discharging pumping hole more than or equal to 0.3m.For obtaining the purpose of exact value more, also can select to be provided with a plurality of pressure samples points and a plurality of pairs of flange barrier film pressure units equally, calculate a plurality of density values, get its mean value as final serum density value according to such scheme.Certainly, also can be under the situation that a plurality of sampling pipeline sections are set, select wherein two sampling pipeline sections to connect two flange barrier film pressure units targetedly and measure, be implemented under the different operating modes purpose at specific absorption tower zone bulk density.And for a plurality of pressure samples points, except make its on the vertical direction of absorption tower at a distance of, it is staggered in a circumferential direction.
According to preferred version of the present invention, in the sampling pipeline section, can use the threeway flange, help more convenient ground off-the-line measuring system when needed so on the one hand, can introduce the technology wash-down water by an opening of threeway flange on the other hand, thereby the measure that is provided with in conjunction with the pipeline section of will taking a sample with being inclined upwardly, by regularly washing away with wash-down water, the congestion affects measurement result that the pipeline section of can effectively avoiding taking a sample causes owing to reasons such as slurries foulings.
Description of drawings
Following according to preferred embodiment, the present invention will be described in conjunction with the accompanying drawings.Accompanying drawing is depicted as:
Fig. 1: the system diagram of the measurement slurry density of desulfurizing absorption column that the present invention proposes;
Embodiment
Fig. 1 shows an embodiment who implements the method for the invention.In Fig. 1, bottom and sidewall have just schematically been drawn with lines in absorption tower 5, and common this absorption tower 5 is cylindric settings.Can see by Fig. 1, on absorption tower 5, choose two pressure samples points on the short transverse, promptly be positioned at top low-pressure lateral pressure sampling spot A and be positioned at following high side pressure sampling spot B along body of the tower.Each pressure samples point A or B draw by a sampling pipeline section respectively, and in this embodiment, above-mentioned sampling pipeline section is made of fairlead 11, valve 1 and threeway flange 2.At this, fairlead 11 links to each other with an interface of threeway flange 2 by valve 1, threeway flange 12 another interfaces are taken over 4 by flange and are linked to each other with rinse water valve 3, and the 3rd interface of threeway flange 12 then is used for connecting the kapillary 8a or the 8b (shown in broken lines at Fig. 1) of pair flange barrier film differential pressure transmitters 9.In Fig. 1, two flange barrier film differential pressure transmitters 9 can be connected near platform by mounting bracket 10.
In the illustrated embodiment, the height distance of absorption tower minimum liquid level 6 at the bottom of the absorption tower is labeled as H, and the difference in height between top low-pressure lateral pressure sampling spot A and the following high side pressure sampling spot B is labeled as h.When implementing method of the present invention, for guaranteeing the accuracy of the final density value that calculates, the position of pressure samples point A and B is limited, promptly to avoid being located at the exit position and the discharge pumping hole position of the oxidation air spray gun in the absorption tower 5 as far as possible.Wherein, the distance of high side pressure sampling spot B at the bottom of the absorption tower is L, the numerical value of L is preferably selected like this, be that it can guarantee on the one hand that high side pressure sampling spot B keeps enough distances to the higher zone of serum density, bottom, absorption tower, guarantees that on the other hand high side pressure sampling spot B is on the discharge pumping hole (not shown in the accompanying drawings).For example L can be chosen for 0.5m for this reason.
Be clearly shown that in Fig. 1 pressure samples point A and B are respectively two end points of difference in height h.Wherein, respectively draw a fairlead 11 from pressure samples point A and B respectively, these two fairleads 11 insert each self-corresponding threeway flange 2 by corresponding valve 1 respectively, and then by kapillary 8a or the 8b that is connected with an interface of threeway flange 12 pressure are transmitted to two flange barrier film differential pressure transmitters 9.At this, the pattern of two flange barrier film differential pressure transmitters 9 is known for a person skilled in the art, therefore repeats no more.The measured value of two flange barrier film differential pressure transmitters 9 promptly is the pressure differential deltap P between low-pressure lateral pressure sampling spot A and the high side pressure sampling spot B.According to the basic formula of P=ρ gh, provide the derivation of the computing formula (absorption tower density calculation formula) of scheme of the present invention below:
Suppose that at first this differential pressure transmitter 9 is installed between two sampling spots, known conditions comprises:
For slurries in the tower: P
1-P
2=ρ
1Gh;
Δ P is the measured value of differential pressure transmitter;
h
t＝h
1+h
2；
Because the tilt angle alpha unanimity of two pressure samples pipeline sections, and diaphragm pressure tap position is identical, so h
t=h; So
ΔP＝(P
1-ρ
2gh1)-(P
2+ρ
2gh
2)
＝(P
1-P
2)-ρ
2g(h
1+h
2)
＝ρ
1gh-ρ
2gh
t
＝ρ
1gh-ρ
2gh
Be ρ
1=(Δ P+ ρ
2Gh)/(gh)
From following formula: because the density p of kapillary filling liquid
2Be the constant relevant with differential pressure transmitter itself, h also is a constant under the situation of selected pressure samples point, so ρ
2Gh is constant and is far smaller than Δ P, so (Δ P+ ρ
2Gh) can consider to utilize revise the zero point of differential pressure transmitter, be full of the deviation ρ that the liquid deadweight causes to eliminate kapillary
2Gh, thus make the reading of two flange barrier film differential pressure transmitters 9 be (Δ P+ ρ in the following formula
2Gh).
Be ρ
1=Δ P
1/ gh
In the above-mentioned formula:
P
1: the high side pressure of differential pressure transmitter;
P
2: the low-pressure lateral pressure of differential pressure transmitter;
Δ P: the measured value of differential pressure transmitter before revising zero point;
Δ P
1: revise the measured value of back differential pressure transmitter zero point;
ρ
1: the absorption tower serum density;
ρ
2: kapillary filling liquid density;
G: gravity constant 9.807m/s
2
H: the difference in height of high side pressure sample position and low-pressure lateral pressure sample position;
h
1: the low-pressure side diaphragm pressure sampling spot of two flange barrier film differential pressure transmitters 9 and the difference in height of transmitter low-pressure side interface;
h
2: the high-pressure side diaphragm pressure sampling spot of two flange barrier film differential pressure transmitters 9 and the difference in height of transmitter high-pressure side interface;
h
t: the difference in height of the low-pressure side diaphragm pressure sampling spot of two flange barrier film differential pressure transmitters 9 and high-pressure side diaphragm pressure sampling spot;
In the solution of the present invention, for obtaining more accurately measured value and simplify and calculate, the high pressure side capillary tube 8b of two flange barrier film differential pressure transmitters 9 is got into identical length with low pressure side capillary tube 8a.The high and low pressure side two capillary length that two flange barrier film differential pressure transmitters 9 are used should equate, purpose is when absorption tower slurries level fluctuation build-up of pressure changes, the pressure conduction time that guarantees high-pressure side and low-pressure side is suitable substantially, avoids because the kapillary filling liquid pressure conduction time difference causes measuring error.
Above-mentioned example supposition differential pressure transmitter 9 is installed between two sampling spots, if but differential pressure transmitter 9 is installed in sampling spot below, high-pressure side or low-pressure side sampling spot top, also can draw same result, but the fine difference of considering different length capillary pressure conduction time can impact the accuracy of differential pressure measurement, during therefore preferred the measurement differential pressure transmitter 9 is located between two sampling spots, the kapillary of high and low pressure side is got identical length with convenient.
Because two flange barrier film differential pressure transmitter 9 measuring error own can cause a deviation to the calculated value of density, therefore behind the measuring accuracy of having considered differential pressure transmitter ± 0.1%, also preferably dwindle the range of two flange barrier film differential pressure transmitters 9, though to guarantee that measured value exists certain deviation deviate in tolerance interval as far as possible.In addition, do not recommend to bring the density value that calculates into the absorbing tower liquid-level computing formula and calculate liquid level, in order to avoid cause differential pressure transmitter off-the-line when flushing, the false fluctuation of liquid level causes the wet method fume desulfurizing system emergency outage.
In addition, slurries in the absorption tower may be in a period of time operation back crystal or fouling in the sampling pipeline section, this can influence the accuracy of pressure measurements, for avoiding above-mentioned situation, and make a whole set of measuring system can reliability service and maintain easily, the present invention takes such measure, be about to technology wash-down water inlet tube 7 and pass to rinse water valve 3, preferably regularly open rinse water valve 3, to introduce the technology wash-down waters by flange adapter 4 and threeway flange 12, wash away the fouling that may exist, make the sampling pipeline section angle α that is arranged to be inclined upwardly in addition, not only help avoiding in the sampling pipeline section, depositing, improve the lasting reliability service time of measuring system, also more help simultaneously by the contingent obstruction of flushing mediation.When two flange barrier film differential pressure transmitters 9 are washed, preferred two flange barrier film differential pressure transmitter 9 off-the-lines that will put into operation earlier.Equally, carry out accident when flushing, consider influence, also can be about to two flange barrier film differential pressure transmitter 9 off-the-lines of putting into operation earlier density at absorption tower gas approach overtemperature.
The technical characterictic that proposes among the present invention can individually use, and also can use in conjunction with concrete application combination, and this is all in design scope of the present invention.In addition,, can be applied to other field equally although the present invention is an example to measure slurry density of desulfurizing absorption column in the wet method fume desulfurizing system, with the fluid in the measuring vessel, the density of liquid or gas for example.
Claims (8)
1. method of measuring slurry density of desulfurizing absorption column, it comprises the steps:
A) body of the tower of (5) is chosen low-pressure lateral pressure sampling spot (A) and high side pressure sampling spot (B) in vertical direction along the absorption tower;
B) draw the sampling pipeline section respectively from high side pressure sampling spot (B) and low-pressure lateral pressure sampling spot (A), the angle of inclination of two pressure samples pipeline sections (α) unanimity;
C) high pressure side capillary tube (8b) and the low pressure side capillary tube (8a) of choosing two flange barrier film differential pressure transmitters (9) is equal length;
D) on the sampling pipeline section of the high pressure side capillary tube (8b) of two flange barrier film differential pressure transmitters (9) and low pressure side capillary tube (8a) being received respectively on the sampling pipeline section of drawing from high side pressure sampling spot (B) and drawing from low-pressure lateral pressure sampling spot (A), and described high pressure side capillary tube (8b) is identical with the pressure tap position of low pressure side capillary tube (8a);
E) by the measured value Δ P of two flange barrier film differential pressure transmitters (9), according to density calculation formula ρ
1=(Δ P+ ρ
2Gh)/(gh) calculate the absorption tower serum density,
ρ in the above-mentioned density calculation formula
1Be absorption tower serum density, ρ
2Be the kapillary filling liquid density of two flange barrier film differential pressure transmitters, g is an acceleration of gravity, and h is the difference in height between high side pressure sampling spot (B) and the low-pressure lateral pressure sampling spot (A);
F) to revising the zero point of two flange barrier film differential pressure transmitters (9), be full of the deviation ρ that the liquid deadweight causes to eliminate kapillary
2Gh, and get ρ
2The above-mentioned density calculation formula of gh=0 substitution.
2. the method for measurement slurry density of desulfurizing absorption column as claimed in claim 1 is characterized in that, described sampling pipeline section of drawing respectively from high side pressure sampling spot (B) and low-pressure lateral pressure sampling spot (A) all is arranged to be inclined upwardly.
3. the method for measurement slurry density of desulfurizing absorption column as claimed in claim 1 is characterized in that, described sampling pipeline section of drawing respectively from high side pressure sampling spot (B) and low-pressure lateral pressure sampling spot (A) also is provided with technology wash-down water inlet tube (7).
4. the method for measurement slurry density of desulfurizing absorption column as claimed in claim 3, it is characterized in that, from the sampling pipeline section that high side pressure sampling spot (B) is drawn, be connected with threeway flange (2) described, its three interfaces connect respectively fairlead (11), two flange barrier film differential pressure transmitters (9) high pressure side capillary tube (8a, 8b) and the flange of technology wash-down water take over (4); From the sampling pipeline section that low-pressure lateral pressure sampling spot (A) is drawn, be connected with threeway flange (2) described, its three interfaces connect respectively fairlead (11), two flange barrier film differential pressure transmitters (9) low pressure side capillary tube (8a, 8b) and the flange of technology wash-down water take over (4).
5. the method for measurement slurry density of desulfurizing absorption column as claimed in claim 3 is characterized in that, when introducing technology wash-down water flushing sampling pipeline section, with two flange barrier film differential pressure transmitters (9) off-the-line that puts into operation.
6. as the method for each described measurement slurry density of desulfurizing absorption column in the claim 1 to 5, it is characterized in that, when absorption tower gas approach overtemperature carries out the accident flushing, two flange barrier film differential pressure transmitters (9) off-the-line that puts into operation.
7. as the method for each described measurement slurry density of desulfurizing absorption column in the claim 1 to 5, it is characterized in that described high side pressure sampling spot (B) and low-pressure lateral pressure sampling spot (A) should be avoided the outlet of oxidation air spray gun and avoid the higher zone of serum density, bottom, absorption tower.
8. the method for measurement slurry density of desulfurizing absorption column as claimed in claim 1 is characterized in that, described high side pressure sampling spot (B) is chosen in discharges more than the residing height of pumping hole.
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| CN102393346A (en) * | 2011-11-09 | 2012-03-28 | 田志刚 | Online density analyzing instrument |
| CN102759494A (en) * | 2012-07-25 | 2012-10-31 | 北京中新国能环保科技有限公司 | Source obtaining device and method in slurry density measurement of desulfurization tower |
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| CN109813630A (en) * | 2017-11-21 | 2019-05-28 | 中蓝连海设计研究院 | A kind of sampling type gradiomanometer and its density measuring method |
| CN108801852A (en) * | 2018-06-14 | 2018-11-13 | 中国三峡建设管理有限公司 | Be in the milk cell density calibration device and method |
| CN110567635A (en) * | 2019-08-27 | 2019-12-13 | 北京国电龙源环保工程有限公司 | Differential pressure measuring device and differential pressure measuring method for limestone wet desulphurization demister |
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| CN115436223A (en) * | 2022-08-24 | 2022-12-06 | 武汉润达中控自动化工程有限公司 | Method and device for detecting density of feed liquid in container and solid content in feed liquid |
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| CN101477020A (en) | 2009-07-08 |
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