CN2240714Y

CN2240714Y - High-precision sampling measure tuble for steam manifold electric contact water level gauge

Info

Publication number: CN2240714Y
Application number: CN 95240275
Authority: CN
Inventors: 高维信
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-08-03
Filing date: 1995-08-03
Publication date: 1996-11-20
Anticipated expiration: 2005-08-03

Abstract

The utility model is suitable for the sampling measurement of the steam drum water levels of high pressure and superhigh pressure boilers. The importance of the measurement of the steam drum water levels is that the distortion degree of water sample can be decreased, and the sample precision of the water levels is increased. The utility model is reasonably provided with an extending condensing chamber, a heating tube, an annular collecting slot, a dispersal water pipe, and other interior means, which not only obtains the purpose that the water sample is close to the truth as much as possible, can guarantee the normal running and the equipment safety of the high pressure and superhigh pressure boilers, but also can extend the service life of electrodes in an original measuring cylinder; the utility model has the characteristics of fast dynamic response and high sensitivity, is superior to the existing measuring cylinder, and is suitable for popularizing and applying in the same industries.

Description

Drum electric contact point fluviograph high-accuracy sampling is measured tube

The utility model relates to the thermal measurement technical field, is suitable for the sampling and measuring of high pressure, superpressure boiler steam water-level especially.

The level measuring of high pressure, superpressure boiler is very important.Water level is too high, will cause the azeotropic of vapour and water to rise, and steam quality is significantly worsened, the superheater fouling, and this not only influences the thermal efficiency, and main is easily to cause the superheater booster and blowing out.Be in full water state in this way, except that harm body of heater safety, also might damage steam turbine.And water level is crossed the low water cycle of can destroying and be caused the water-cooling wall pipe explosion accident and blowing out.These all can constitute the serious catastrophic failure of loss.Be widely used in drum electric contact point fluviograph that power plant monitors boiler operatiopn, simple in structure more directly perceived at present than differential pressure type telemetering level meter, relatively accurate reliable to the demonstration of sampling water level, but owing to take out the heat radiation factor of water sample from drum, the temperature of water sample and severe all are different from the full Heshui in the drum, make the sampling distortion, form the water level sampling error, its error has surpassed the error that the minimum accuracy class of industry spot thermal meter is allowed, and this has brought hidden danger for the safe operation of high pressure, superpressure boiler.

Goal of the invention of the present utility model is to reduce to measure a degree of distortion of institute's water sampling as far as possible, promptly to make the water potential of measuring institute's water sampling in the tube accurately show the water level of drum, the reliability of flooding and reporting to the police makes the temperature of institute's water sampling can equal the interior full temperature of closing of boiler-steam dome as far as possible.Make the recovery of " distortion " water sample, guarantee high pressure, the normal operation of superpressure boiler and the safety of equipment thereby improve sampling precision.

The method that the utility model restores water sample is the heating water sample, improves its temperature and medial temperature is no more than the full Heshui temperature of drum; The 2nd, increase the share of measuring new condensate water in the tube, improve medial temperature; The 3rd, change temperature field distribution in the water sample, reduce the thickness of the floating layer in new condensate water top, so that increase the caloric receptivity of water sample.For this reason, this reality is done novel structure have been done redesign, its principal character as shown in the figure:

Accompanying drawing 1 is made novel immanent structure synoptic diagram for this reality

Accompanying drawing 2 is A-A, the B-B section of accompanying drawing 1

Accompanying drawing 3 is the D-D section of accompanying drawing 1

Accompanying drawing 4 is the structural representation of annular collection trough of the present utility model and drain pipe junction

Among the figure: 1 is that fairlead, 2 is that low head, 3 is that water sample back cover, 4 is that blow-off pipe, 5 is that lateral water sampling tube, 6 is that electrode holder, 7 is that electrode, 8 is that barrel, 9 is that drain pipe, 10 is that annular collection trough, 11 is that vapour side stopple coupon, 12 is that heating tube, 13 is that plum blossom support, 14 is a upper cover.

Now be described in detail by reference to the accompanying drawings:

The utility model is except the vapour side-draw sample that includes former drum electric contact point fluviograph Pipe 11, lateral water sampling tube 5, blow-off pipe 4, electrode 7 and electrode holder 6 thereof, Beyond the barrel 8, also include heating tube 12, drain pipe 9 and stretch high condensation chamber, Lower steam chest and annular collection trough 10, fairlead 1, and by water sample back cover and low head Consist of lower steam chest, between the above and upper cover of vapour side probe tube for stretching high condensation chamber, Heating tube 12 is vertical bundle pipe type garden week shape and distributes, and top is fixed on plum blossom and props up On the frame, suitable for reading lead to stretch high condensation chamber, end opening leads to lower steam chest. In addition: in the tube The stage casing also be horizontally installed with annular collection trough 10 and with vertically arranged drain pipe 9 Communicate. Heating tube 12, centre have one, and all the other can distribute by garden week, can be The 5-7 root, drain pipe 9 is 3.

As seen from the figure, it is the full gas that closes of measuring vapour side in the tube that the utility model 3 adopts the hot vapour source that adds of cluster type heating tube, and saturated steam enters heating tube bundle, comes together in down steam chest by the water sample back cover after tube wall is to the water sample heat release, is discharged by fairlead.Heating tube bundle and electrode tip holder are equal angular alternative arrangement, and electrode tip holder is as pressing 120 ° of layouts, and then heating tube is 7, if by 90 ° of layouts, heating tube is 5.The utility model is set stretches the condensation that high formula condensation chamber can be strengthened saturated steam in the steam chest, increases the condensing water flow that flows into water sample, has just increased new share of coagulating water in the water sample.Annular collection trough of the present utility model and drain pipe can the new condensate water that temperature is high be transported to the low bottom of TWS, can reduce the thickness of the floating layer in condensate water top, reduce the thermal resistance of conducting heat to the water sample bottom.

The utility model requires to make according to said structure and finishes and can come into operation, its using method and program are advisable for 13-15 rice but will note drawing the mouth of pipe to distance between the drum downtake stub (tube) of (belonging to the proprietary parts of boiler plant) with former drum contact water level gauge sampling and measuring tube.All the other partly also all are same as former measuring system as secondary instruments such as steam water-level demonstration, warnings.

The utility model has reduced sampling " degree of distortion " really through actual measurement, calculating, contrast, and owing to a TWS in the measurement tube is evenly distributed, make electrode be subjected to the thermal shock of alternation little, prolonged electrode life, and the medial temperature of this sampling and measuring tube water sample, average severe changes than very fast, when drum pressure changes, cause when the drum water sample changes, it is fast that it measures dynamic response, improved sensitivity, is better than existing steam pocket water level sampling and measures tube, reached the expection goal of the invention, can in the same industry, be applicable.

Claims

1, a kind of vapour side stopple coupon 11 that includes, lateral water sampling tube 5, blow-off pipe 4, the drum electric contact point fluviograph high-accuracy sampling of electrode 7 and electrode holder 6 is measured tube, it is characterized in that: it also includes heating tube 12, drain pipe 9 and stretch high condensation chamber, following steam chest and annular collection trough 10, fairlead 1, and constitute steam chest down by water sample back cover and low head, between the above and upper cover of vapour side stopple coupon for stretching high condensation chamber, heating tube is vertically to the shape distribution of boundling tubular type garden week, top is fixed on the plum blossom support, suitable for reading leading to stretched high condensation chamber, and end opening leads to steam chest down.

2, drum electric contact point fluviograph high-accuracy sampling according to claim 1 is measured tube, it is characterized in that: the stage casing is horizontally installed with annular collection trough 10 in the tube, and communicates with vertically arranged drain pipe 9.

3, measure tube according to claim 1 and 2 described drum electric contact point fluviograph high-accuracy samplings, it is characterized in that: its heating tube 12 can be the 5-7 root, drain pipe 9 can be 3, the height of stretching high condensation chamber be between vapour, the lateral water sampling tube height about 2/3rds.