CN202885908U - Differential pressure type non-balance container device for measuring high-temperature high-pressure container liquid level - Google Patents
Differential pressure type non-balance container device for measuring high-temperature high-pressure container liquid level Download PDFInfo
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- CN202885908U CN202885908U CN 201220352360 CN201220352360U CN202885908U CN 202885908 U CN202885908 U CN 202885908U CN 201220352360 CN201220352360 CN 201220352360 CN 201220352360 U CN201220352360 U CN 201220352360U CN 202885908 U CN202885908 U CN 202885908U
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- differential pressure
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- stopple coupon
- liquid level
- high temperature
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Abstract
The utility model provides a differential pressure type non-balance container device for measuring a high-temperature high-pressure container liquid lever. The device comprises a water side sampling pipe, a steam side sampling pipe, and a differential pressure transmitter. The water side sampling pipe comprises a first horizontal section, a vertical section, and the second horizontal section. The first horizontal section, the vertical section, and the second horizontal section are successively connected with one another. The first horizontal section is used for connecting the lower portion of a high-temperature high-pressure container. The steam side sampling pipe is used for connecting the upper portion of the high-temperature high-pressure container. The differential pressure transmitter is connected with the second horizontal section and the steam side sampling pipe, and the height of the second horizontal section is equal to the height of the steam side sampling pipe. The differential pressure type non-balance container device for measuring the high-temperature high-pressure container liquid lever has the advantages of being simple in structure, reliable in work, convenient to use, and low in cost.
Description
Technical field
The utility model relates to a kind of device and method of measuring the high temperature and high pressure containers liquid level, relates in particular to a kind of differential pressure type is measured the high temperature and high pressure containers liquid level without equalizing reservoir device and method.
Background technology
At present, in power industry, high temperature and high pressure containers is: internal pressure 〉=10MPa is high pressure vessel, and wall temperature 〉=350 ℃ are elevated temperature vessel.During to high temperature and high pressure containers (drum, Gao Jia etc.) level gauging, using the most extensively is equalizing reservoir, and its Main Function is condensing vapour, produces comparing water column.
Fuel-burning power plant Subcritical Units drum level measurement is the foundation that main protection of boiler, steam water-level are regulated automatically, but because the operating mode of drum High Temperature High Pressure, accurate, its water level of stably measured is a great problem all the time.Now widely used teletransmission steam water-level in respect of:
1, single equalizing reservoir pressure difference water gauge, it is the most widely used Level Measuring Equipment in Steam Drum, structural drawing as shown in Figure 1, its principle is as follows:
When Δ P2=0, H=[(r-r ") gL-Δ P1]/(r '-r ") g.
Δ P1 in the formula: the differential pressure value (during Δ P2=0) of water level in comparing water column that transmitter is surveyed and the drum; L: comparing water column height; R: the average density of comparing water column; Δ P2: the additional differential pressure of positive and negative pressure side instrumentation pipeline.Here the density of saturated vapour and saturation water (r ", r ') is the single value nonlinearity function of drum pressure P; can obtain by measuring drum pressure, and in the comparing water column average density r of water to have very large uncertainty be to cause the one of the main reasons of measuring error.
As shown in Figure 1, the top of single-compartment balance container is saturated vapour all the time, the water surface contacted with it be saturation water.Single-compartment balance container is except outside radiant heat transfer, it also will be along metallic walls and the downward conduction heat transfer of water, the Temperature Distribution of comparing water column as shown in Figure 2, the Temperature Distribution t=f of comparing water column (x) is the exponential function of comparing water column, its funtcional relationship is relevant with the structure of cylindrical shell, the caliber of showing pipe, environment temperature, wind direction, insulation situation etc., has very large uncertainty.Equalizing reservoir is because surface area is larger simultaneously, and heat radiation is very fast, and steam within it section condenses, and has caused certain siphonage, causes its pressure a little less than the drum internal pressure, to measuring certain influence is arranged also.
2, built-in equalizing reservoir pressure difference water gauge; as shown in Figure 3; it places drum 7 inside with single chamber container (balance tank 8); its water receptacle and comparing water column are under the saturation water temperature environment forever; overcome the deficiency that the comparing water column water temperature of traditional single-compartment balance container shown in Figure 1 is difficult to measure; avoid atmospheric temperature on the impact of comparing water column water temperature, water column density; signal is more stable, compensation formula is simpler thereby make; the additive error of measuring is less; improve the confidence level of control survey, flood and automatically regulate, protect stability.The principle of the built-in water level balance container of drum is: the built-in water level balance container of drum mainly comprises drainer 1, lateral steam tube 2, malleation stopple coupon 3, lateral water sampling tube 4, DCS (Distributed Control System (DCS)) 5, differential pressure transmitter 6, drum 7, balance tank 8, malleation stopple coupon 9 for subsequent use.Saturated steam enters into drainer 1 and is condensed into saturation water and is back to balance tank 8 in the drum operational process, the formed static pressure of comparing water column is guided to the anode of differential pressure transmitter 6 by malleation stopple coupon 3, water in the drum 7 is guided to the negative terminal of differential pressure transmitter 6 by lateral water sampling tube 4, differential pressure transmitter 6 output differential pressure signals are to DCS 5 like this, calculate water level in the drum 7 by pressure compensation in DCS 5.Doing does not like this have environment temperature to the impact of comparing water column density, and the result who calculates can really reflect the drum real water level just closer to the actual water level in the drum.
Among Fig. 3, L is that balance tank 8 upper edges are to the distance of lateral water sampling tube 4 center lines, H0 is that drum 7 designs 0 waterline is to the distance of lateral water sampling tube 4 center lines, Δ H is that present waterline is with respect to the difference of 0 waterline, γ 1 is the density of saturation water, γ 2 is the density of saturated vapor, and α is lateral steam tube 2 when folding into balance tanks 8 corresponding to the edge of balance tank 8, the bending angle of the upper surface of lateral steam tube 2.
Can list following formula thus: Δ H=L-H0-Δ P/ (γ 1-γ 2).Can find out that from formula water level is only relevant with the density of saturation water and saturated vapor, and density is relevant with pressure, just can find density as long as measure drum pressure from density meter, the substitution formula can calculate water level.
Malleation stopple coupon 9 for subsequent use prevents that malleation table pipe can be attached thereto after the accident from appearring in built-in balance tank 8.So just the external single chamber container with Fig. 1 is the same, makes provision against emergencies.
In sum, the shortcoming of single-compartment balance container is: the accuracy of measurement is affected by environment very large, probably causes the main protection tripping.The shortcoming of built-in equalizing reservoir is: structure is complicated, needs at inside steam drum balance tank to be installed, in case go wrong, can't in time overhaul, and returns to single equalizing reservoir mode.
The utility model content
The purpose of this utility model is to provide a kind of differential pressure type to measure the device of high temperature and high pressure containers liquid level without equalizing reservoir, and the measurement accuracy that prior art exists is not high to solve, complex structure, stable insecure problem.
To achieve these goals, on the one hand, the utility model provides a kind of differential pressure type to measure the device of high temperature and high pressure containers liquid level without equalizing reservoir, it comprises: lateral water sampling tube, comprise the first horizontal segment that connects successively, vertical section and the second horizontal segment, described the first horizontal segment is for be connected the bottom connection with high temperature and high pressure containers; Vapour side stopple coupon is for be connected the top connection with high temperature and high pressure containers; Differential pressure transmitter is connected in described the second horizontal segment and described vapour side stopple coupon, and described the second horizontal segment is identical with described vapour side stopple coupon height.
According to a kind of preferred implementation of above-mentioned differential pressure type without the device of equalizing reservoir measurement high temperature and high pressure containers liquid level, wherein, described vapour side stopple coupon is
The stainless steel stopple coupon.
According to a kind of preferred implementation of above-mentioned differential pressure type without the device of equalizing reservoir measurement high temperature and high pressure containers liquid level, wherein, the position of described differential pressure transmitter is concordant with described vapour side stopple coupon.
According to a kind of preferred implementation of above-mentioned differential pressure type without the device of equalizing reservoir measurement high temperature and high pressure containers liquid level, wherein, described vapour side-draw sample pipe has a degree of tilt to be used for water.
To achieve these goals, on the other hand, the utility model provides a kind of method of utilizing above-mentioned arbitrary described measurement device high temperature and high pressure containers liquid level, it may further comprise the steps: at boiler water filling, after 0.2～0.5Mpa pressure is arranged in the drum, open the sewage draining exit on the differential pressure transmitter, allow the interior water of drum fill up lateral water sampling tube, and flow out from the sewage draining exit of differential pressure transmitter; Close the differential pressure transmitter sewage draining exit; If the differential pressure △ P that differential pressure transmitter measures is with mm H
2O is unit, and then steam water-level H can obtain by following formula: H=[(r-r ") s-△ P]/(r '-r "); Wherein, s is the difference in height of water side sample tap and vapour side sample tap, r ' and r " be the single-valued function of drum pressure, obtain by compensation formula.
In the utility model, because comparing water column is not to rely on steam condensation to form, reasonably select the length of D section can make the temperature of whole comparing water column equal environment temperature.Because there is not the impact of equalizing reservoir, comparing water column does not have thermograde, does not have siphonage yet, has reduced to greatest extent the impact of measuring error and environment.Vapour side stopple coupon is concordant with sample tap, as long as enough length coolings are arranged, just can eliminate all disturbing factors.Compare with present built-in equalizing reservoir, can arrive equal measurement effect, but structure is simpler, it is more reliable, more convenient to work, and cost is cheaper.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of single equalizing reservoir pressure difference water gauge of prior art;
Fig. 2 is the structural representation of the built-in equalizing reservoir pressure difference water gauge of prior art;
Fig. 3 is the relation curve of comparing water column and its temperature among Fig. 2;
Fig. 4 is that the utility model embodiment is when using and the structural representation of drum.
Embodiment
Below in conjunction with accompanying drawing of the present utility model, the technical solution of the utility model is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
As shown in Figure 4, the utility model embodiment comprises vapour side stopple coupon 701, lateral water sampling tube 702 and differential pressure transmitter 6.Lateral water sampling tube 702 comprises the first horizontal segment D that connects successively, vertical section Z and the second horizontal segment L, and the water liquid of the first horizontal segment D and high temperature and high pressure containers drum 7 bottoms is communicated with.The water vapour on vapour side stopple coupon 701 and drum 7 tops is communicated with.Differential pressure transmitter 6 is connected in the second horizontal segment L and vapour side stopple coupon 701, and the second horizontal segment L is highly identical with vapour side stopple coupon 701.
The position of differential pressure transmitter 6 is concordant with vapour side stopple coupon 701, and vapour side stopple coupon 701 adopts
The stainless steel stopple coupon, and have one smallly in lower angle, avoid chilled water liquid to enter drum 7.Differential pressure transmitter 6 is away from drum 7, so that vapour side stopple coupon 701 has enough length to come cooling steam.Water column in the vapour side stopple coupon 701 is not because not highly, so can not produce additional pressures to differential pressure transmitter 6.In fact the second horizontal segment L of lateral water sampling tube is concordant (in order to show, some distance has deliberately staggered among the figure) with vapour side stopple coupon 701.
When present embodiment used, primary input step was as follows:
At boiler water filling, 0.2～0.5Mpa pressure is arranged in the drum 7 after, open the sewage draining exit on the differential pressure transmitter 6.Allow drum 7 interior water fill up lateral water sampling tube 702, and flow out from the sewage draining exit of differential pressure transmitter 6.
Close differential pressure transmitter 6 body sewage draining exits.
If the differential pressure △ P that differential pressure transmitter measures is with mm H
2O is unit, then the water level H of drum 7 can obtain by following formula: H=[(r-r ") s-△ P]/(r '-r "), wherein, s is the difference in height of water side sample tap and vapour side sample tap, r ' and r " be the single-valued function of drum pressure, can obtain by compensation formula.
To sum up, the utility model moves to transmitter concordant with vapour side sample tap, and guarantees that certain-length cools off, and this mounting means from known all transmitters is all different, changes very little but the good results are evident.Be specially, the utlity model has following advantage:
Because comparing water column is not to rely on steam condensation to form, and reasonably selects the length of the first horizontal segment can make the temperature of whole comparing water column equal environment temperature.Because there is not the impact of equalizing reservoir, comparing water column does not have thermograde, does not have siphonage, to greatest extent the impact of Reduce measurement error and environment yet.
Vapour side stopple coupon is concordant with sample tap, as long as enough length coolings are arranged, just can eliminate all disturbing factors.
Compare with at present best built-in equalizing reservoir, can arrive its measurement effect, but structure is simpler, it is more reliable to work, and transforms more conveniently, and cost is cheapest in known all modes.The above; it only is embodiment of the present utility model; but protection domain of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; can expect easily changing or replacing, all should be encompassed within the protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion by described protection domain with claim.
Claims (4)
1. a differential pressure type is measured the device of high temperature and high pressure containers liquid level without equalizing reservoir, it is characterized in that, comprising:
Lateral water sampling tube comprises the first horizontal segment that connects successively, vertical section and the second horizontal segment, and described the first horizontal segment is for be connected the bottom connection with high temperature and high pressure containers;
Vapour side stopple coupon is for be connected the top connection with high temperature and high pressure containers;
Differential pressure transmitter is connected in described the second horizontal segment and described vapour side stopple coupon, and described the second horizontal segment is identical with described vapour side stopple coupon height.
2. differential pressure type according to claim 1 is characterized in that without the device of equalizing reservoir measurement high temperature and high pressure containers liquid level described vapour side stopple coupon is the stainless steel stopple coupon of φ 16 * 3.
3. differential pressure type according to claim 1 is characterized in that without the device of equalizing reservoir measurement high temperature and high pressure containers liquid level the position of described differential pressure transmitter is concordant with described vapour side stopple coupon.
4. differential pressure type according to claim 1 is characterized in that without the device of equalizing reservoir measurement high temperature and high pressure containers liquid level, and described vapour side-draw sample pipe has a degree of tilt to be used for water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220352360 CN202885908U (en) | 2012-07-20 | 2012-07-20 | Differential pressure type non-balance container device for measuring high-temperature high-pressure container liquid level |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220352360 CN202885908U (en) | 2012-07-20 | 2012-07-20 | Differential pressure type non-balance container device for measuring high-temperature high-pressure container liquid level |
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| Publication Number | Publication Date |
|---|---|
| CN202885908U true CN202885908U (en) | 2013-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220352360 Expired - Fee Related CN202885908U (en) | 2012-07-20 | 2012-07-20 | Differential pressure type non-balance container device for measuring high-temperature high-pressure container liquid level |
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| CN (1) | CN202885908U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107870015A (en) * | 2017-12-14 | 2018-04-03 | 马跃华 | Level Measuring Equipment in Steam Drum |
-
2012
- 2012-07-20 CN CN 201220352360 patent/CN202885908U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107870015A (en) * | 2017-12-14 | 2018-04-03 | 马跃华 | Level Measuring Equipment in Steam Drum |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130417 Termination date: 20140720 |
|
| EXPY | Termination of patent right or utility model |