CN103808475B - A kind of leak detection detecting head, the online leakage detection apparatus of condenser and application thereof - Google Patents

A kind of leak detection detecting head, the online leakage detection apparatus of condenser and application thereof Download PDF

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Publication number
CN103808475B
CN103808475B CN201410070808.7A CN201410070808A CN103808475B CN 103808475 B CN103808475 B CN 103808475B CN 201410070808 A CN201410070808 A CN 201410070808A CN 103808475 B CN103808475 B CN 103808475B
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plug
detecting head
housing
leak detection
condenser
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CN103808475A (en
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沈德明
刘国耀
贺赟晖
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Nanjing Electric Power Plant of Datang Group
Nanjing Sciyon Automation Group Co Ltd
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Nanjing Sciyon Automation Group Co Ltd
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Abstract

The invention discloses a kind of detecting head of hunting leak, the online leakage detection apparatus of condenser using this leak detection detecting head and leak hunting method.The present invention hunts leak the detecting head leak detection for condenser condenser pipe, including housing, pressure sensor and driving means;Housing forward end opening;Pressure sensor is located in housing, is connected with housing seal, and enclosure interior is divided into pressure detecting chamber and former and later two cavitys of pressure stabilizing cavity;Driving means is connected with housing rear end;When hunting leak, housing forward end and condenser pipe week to be measured side pipe plate gluing, sealing, or housing forward end stretch in condenser pipe to be measured with condenser pipe inwall gluing, sealing.The online leakage detection apparatus of condenser of the present invention, including above-mentioned leak detection detecting head, plug, mechanical arm and control system.The present invention can effectively realize hunting leak online the automation of process, easy to use, safe and reliable.

Description

A kind of leak detection detecting head, the online leakage detection apparatus of condenser and application thereof
Technical field
The present invention relates to a kind of leak detection detecting head, the leakage detection apparatus using this leak detection detecting head and concrete leak hunting method hunted leak online for condenser.
Background technology
Condenser is the important device in steam turbine of thermal power plant electricity generation system, and Main Function is in addition to being condensed into water boiler of feeding by the steam discharge of steam turbine and reusing, moreover it is possible to sets up vacuum at turbine discharge and maintains vacuum.The efficiency of steam turbine and the vacuum of condenser have much relations, and vacuum is the biggest, and efficiency is the highest.Condenser is once revealed, and vacuum will decline.The leakage of condenser mostly occurs in the junction of condenser pipe or condenser pipe with tube sheet, but condenser condenser pipe Numerous, leak detection is an industry difficult problem.
The existing leak detection to condenser mainly uses following several method:
1, gas tracing.This detection method is carried out under off-line (shutdown) state, condenser artificially produces vacuum, is passed through the gas containing certain chemical composition to each condenser pipe respectively, by the detection of condensation chamber gas componant is judged leak point.Although the method can effectively judge the condenser pipe occurring to reveal, but the method must be carried out under stopped status, have impact on production efficiency, and needs artificial generation vacuum and be constantly passed through gas, and complex, cost is high.
2, condenser water sample monitoring method.This monitoring method carries out chemical composition analysis by the water sample in collection condenser condensed water and judges whether condenser is revealed.The method on-line monitoring, although do not affect production efficiency, but whether it can only monitor and reveal, it is impossible to effectively judge concrete leak point.
3, pressure detecting method.Including positive pressure method and negative pressure; generally use and shut down detection; need to pressurize to the condensation chamber of condenser; also employing is had to vacuumize; or close after tested condenser pipe condenser pipe pressurization etc., this several method, be required for additionaling power; then manually condenser pipe pressure detecting one by one or air-flow are judged, inefficiency.At present; also there is the pressure detection method in the case of using half to shut down; this method is condenser pipe place to be detected hydroecium part to be quit work; other parts condenser pipe still works and makes to produce in condenser vacuum; although this half shutdown method is not required to additionaling power, but still it is artificial each condenser pipe to be measured to be carried out pressure detecting or air-flow judges leak point.Although these pressure detecting methods can effectively detect leak point, but is all to shut down or use manual detection, majority to need additionaling power under half shutdown, operating relatively complicated, detection efficiency is low.
Summary of the invention
The invention aims to solve defect present in prior art, it is provided that a kind of leak detection detecting head and leakage detection apparatus that can the most automatically detect leak point online.
In order to achieve the above object, the invention provides a kind of leak detection detecting head, this leak detection detecting head is for the leak detection of condenser condenser pipe, including housing, pressure sensor and driving means;Housing forward end opening;Pressure sensor is located in housing, is connected with housing seal, and enclosure interior is divided into pressure detecting chamber and former and later two cavitys of pressure stabilizing cavity;Driving means is connected with housing rear end;When hunting leak, housing forward end and condenser pipe week to be measured side pipe plate gluing, sealing, or housing forward end stretch in condenser pipe to be measured with condenser pipe inwall gluing, sealing.
Being further improvement of the present invention: above-mentioned housing is provided with voltage stabilizing through hole, this voltage stabilizing through hole is connected with above-mentioned pressure stabilizing cavity.Communicated with the condenser water box external world by voltage stabilizing through hole, make pressure in pressure stabilizing cavity maintain an atmospheric pressure, play pressure calibration purpose.
Present invention detecting head of hunting leak also includes hold down gag, and driving means is connected with housing rear end by hold down gag.
Sealing dividing plate and short axle it is provided with in above-mentioned housing;Wherein, seal dividing plate and surround above-mentioned pressure stabilizing cavity with housing, pressure sensor;Short axle is positioned at housing rear end, and is connected with sealing divider upright;Hold down gag includes stage clip and compresses axle sleeve;Stage clip and compression axle sleeve are placed on short axle successively;Compressing axle sleeve one end and be positioned at housing, the other end stretches out housing and is connected with driving means;Seal dividing plate, stage clip, compression axle sleeve and housing the most mutually to conflict.
Housing rear end is provided with opening, and opening part is fixed with ring-type end cap;When stage clip is in nature elongation state, above-mentioned compression axle sleeve is inconsistent with end cap.
In order to preferably fit with condenser pipe or tube sheet, housing forward end opening part is provided with bore seal;This bore seal is in the form of annular discs or round table-like;Bore seal is provided with and the through hole of housing forward end opening in communication;When bore seal is in the form of annular discs, on it, hole size is more than condenser pipe mouth of pipe size to be measured so that this leak detection detecting head can not only detect condenser pipe, can also detect the leakage of condenser pipe and tube sheet junction simultaneously;When bore seal is round table-like, its point diameter is less than condenser pipe diameter to be measured, and rear end diameter is more than condenser pipe diameter to be measured so that leak detection detecting head preferably fits with condenser pipe inwall in can extend into condenser pipe.
The preferred B/P EGR Back Pressure Transducer EGR of above-mentioned pressure sensor.
Present invention also offers a kind of online leakage detection apparatus of condenser using above-mentioned leak detection detecting head, this leakage detection apparatus also includes plug, plug driving means, mechanical arm one, mechanical arm two and control system;Mechanical arm one is connected with the driving means of leak detection detecting head;Mechanical arm two is connected with plug rear end by plug driving means;Pressure sensor, mechanical arm one, mechanical arm two, plug driving means, the driving means of leak detection detecting head are connected with control system respectively;When hunting leak, the tube sheet gluing, sealing of plug front end and condenser pipe week to be measured side, or plug front end stretch in condenser pipe to be measured with condenser pipe inwall gluing, sealing.
Wherein, online leakage detection apparatus also includes plug hold down gag;Plug driving means is connected with plug by plug hold down gag.
Plug rear end is provided with the short axle of plug;Plug hold down gag includes that plug stage clip and plug compress axle sleeve;Plug stage clip and plug compress axle sleeve and are placed on successively on the short axle of plug;It is inconsistent that plug stage clip two ends compress axle sleeve one end with plug and plug respectively;Plug compresses the axle sleeve other end and is connected with plug driving means.
Plug also includes plug housing and plug sealing plate;Plug sealing plate is positioned at plug housing;The short axle of plug is positioned at plug housing rear end, and is vertically connected with plug sealing plate;Plug compresses axle sleeve one end and is positioned at plug housing, and the other end stretches out plug housing and is connected with plug driving means;Plug sealing plate, plug stage clip, plug compress axle sleeve and plug housing is the most mutually conflicted.
Plug housing rear end is provided with opening, and opening part is fixed with ring-type end cap;When stage clip is in nature elongation state, it is inconsistent with this end cap that plug compresses axle sleeve.
In order to preferably fit with condenser pipe or tube sheet, plug housing forward end opening part is provided with the bore seal identical with detecting head housing forward end of hunting leak.
Present invention also offers a kind of method using above-mentioned leakage detection apparatus that condenser is hunted leak online, comprise the following steps:
(1) during mechanical arm one, mechanical arm two lay respectively at two hydroeciums of condenser;Control system controls mechanical arm one, mechanical arm two and moves in the plane being parallel to condenser condenser pipe tube sheet, and is accurately positioned plug with leak detection detecting head respectively to the two ends that condenser pipe to be measured is corresponding;
(2) control system is by controlling the leak detection driving means of detecting head, plug driving means, make leak detection detecting head, plug move forward respectively, to leak detection detecting head front end, plug front end respectively with condenser pipe two ends to be measured week side pipe plate gluing, sealing or with condenser pipe two ends to be measured inwall gluing, sealing;
(3) the pressure change in the pressure sensor that sets senses region to be measured (condenser pipe to be measured or condenser pipe to be measured and with tube sheet joint) in leak detection detecting head, transmits a signal to control system, by control system record and export leak detection result;
(4) control system controls the leak detection driving means of detecting head, plug driving means returns back to the initial position in step (2).
The present invention has the advantage that compared to existing technology
(1) can be implemented in line leak detection.Due to the fact that the mechanical arm that have employed the band control system being arranged in condenser water box realizes location, and pass through leak detection detecting head on the robotic arm and plug are installed, one by one complete the closure of the tube sheet planar to tested condenser pipe or tested condenser pipe, the interference-free leak detection environment in local is formed in condenser, and by comprising the leak detection detecting head of pressure sensor, complete the leak detection work to measurand.This device can realize the online leak detection to condenser completely in the case of non-stop-machine and safeguard, and condenser is due to condenser pipe huge amount, and online leak detection is greatly prolonged condenser and runs man-hour, and the maintenance cost of leak detection is shut down in minimizing, improves the production efficiency of factory.
(2) present invention makes full use of the vacuum characteristic that gas trap condensation chamber operationally formed and detects, it is not necessary to apply active signal or chemical agent.The vacuum characteristic operationally formed just because of gas trap condensation chamber, so when gas trap condensation chamber occurs leakage, either at condenser condenser pipe or tube sheet joint, corresponding sealing area pressure can be less than an atmospheric pressure, and online just can the sensing of leak detection detecting head provided by the present invention blocks ambient pressure variations signal.
(3) control process and realize automation.The control system quoted due to this device and mechanical arm, it is possible to achieve the automation of online process of hunting leak, make this device easy to use, safe and reliable.
Accompanying drawing explanation
Fig. 1 is that the present invention hunts leak the structural representation of detecting head;
Fig. 2 is the structural representation of Fig. 1 middle shell;
Fig. 3 is that the present invention hunts leak the another kind of structural representation of detecting head;
Fig. 4 is the structural representation of the online leakage detection apparatus of condenser of the present invention;
Fig. 5 is the structural representation of end cap in Fig. 4;
Fig. 6 is the structural representation of plug in Fig. 5;
Fig. 7 is the another kind of structural representation of end cap in Fig. 4.
nullIn figure,1-hunts leak detecting head,2-mechanical arm one,3-end cap,4-mechanical arm two,5-control system,6-condenser pipe,7-tube sheet,1.1-housing,1.2-pressure sensor,1.3-stage clip,1.4-end cap,1.5-compresses axle sleeve,1.6-driving means,1.7-pressure detecting chamber,1.8-pressure stabilizing cavity,1.1.1-bore seal,1.1.2-voltage stabilizing through hole,1.1.3-dividing plate is sealed,The shortest axle,1.1.5-adpting flange,3.1-plug,3.3-plug stage clip,3.4-plug end cap,3.5-plug compresses axle sleeve,3.6-plug driving means,3.1.1-plug bore seal,3.1.2-plug housing,3.1.3-plug sealing plate,3.1.4-the short axle of plug,3.1.5-plug adpting flange.
Detailed description of the invention
The present invention is described in detail below in conjunction with the accompanying drawings.
As shown in Figure 4, the online leakage detection apparatus of condenser of the present invention includes: leak detection detecting head 1, mechanical arm 1, end cap 3, mechanical arm 24 and control system 5.Wherein, mechanical arm 1 and mechanical arm 24 are separately mounted in two hydroeciums of condenser, use double freedom mechanical arm, can be along district's domain action of tube sheet 7 plane being parallel to condenser.Leak detection detecting head 1, end cap 3 are separately mounted on mechanical arm 1, mechanical arm 24.Control system 5 uses PLC control system or Power Plant DCS, controls to connect mechanical arm 1, mechanical arm 24, leak detection detecting head 1 and end cap 3 by controlling circuit.
Leak detection detecting head 1 includes housing 1.1, pressure sensor 1.2, is constituted hold down gag, end cap 1.4, driving means 1.6 by stage clip 1.3 and compression axle sleeve 1.5.Wherein, housing 1.1 front end be provided with bore seal 1.1.1, middle intersegmental part be provided with seal be coaxially provided with inside dividing plate 1.1.3, rear end be fixed on the short axle 1.1.4 that seals on dividing plate 1.1.3, afterbody is provided with adpting flange 1.1.5.Hunt leak for the present invention as shown in Figure 1 and Figure 2 a kind of structure using end face gluing, sealing of detecting head 1, wherein being located at bore seal 1.1.1 of housing 1.1 front end is to be provided with coaxial through-hole and outer shape is the structure of annulus, realizes the end face seal to tube sheet 7 by this circular ring structure and fits;More than the condenser pipe mouth of pipe, (through hole can cover one or more condenser pipe mouth of pipe to this annulus endoporus (i.e. through hole), its specific size is configured according to area size to be measured), inside and outside circle diameter difference is more than condenser pipe nozzle diameter, when avoiding the tested sealing area being likely to occur to contain the mouth of pipe having part non-master survey condenser pipe, can effectively seal this mouth of pipe.It is illustrated in figure 3 the present invention to hunt leak the another kind of structure using conical surface gluing, sealing of detecting head 1, wherein it is located at bore seal 1.1.1 of housing 1.1 front end for being provided with coaxial through-hole, and outer shape is the structure of round platform, realizes the sealing with condenser pipe inwall in stretching into condenser pipe 6 by this frustum cone structure and fit.
The preferred B/P EGR Back Pressure Transducer EGR of pressure sensor 1.2, pressure sensor 1.2 is assemblied in the stage casing of housing 1.1, and housing 1.1 is divided into pressure detecting chamber 1.7, former and later two cavitys of pressure stabilizing cavity 1.8.Pressure sensor 1.2 front end seals with housing 1.1 and is connected, rear end is fixed on sealing dividing plate 1.1.3, the pressure stabilizing cavity 1.8 that pressure sensor 1.2, housing 1.1 and sealing dividing plate 1.1.3 surround is confined space, surround and voltage stabilizing through hole 1.1.2 is set on the housing of pressure stabilizing cavity 1.8, for connecting with free surrounding space, in ensureing this confined space to be 1 atmospheric pressure.Constituted hold down gag by stage clip 1.3, compression axle sleeve 1.5 to be set on the short axle 1.1.4 of the back segment sealing cavity 1.1, it is connected by end cap 1.4 is fixing with adpting flange 1.1.5, and make sealing dividing plate 1.13, stage clip 1.3, compress axle sleeve 1.5, end cap 1.4 and mutually conflict connection, and compress axle sleeve 1.5 and used electromagnet apparatus or hydraulic cylinder or pneumatic cylinder or motor driver by driving means 1.6 drive connection, driving means 1.6.
As shown in Fig. 5 or Fig. 7, end cap 3 includes plug 3.1, is constituted plug hold down gag, plug driving means 3.6 by plug stage clip 3.3 and plug compression axle sleeve 3.5.The structure of this end cap 3 is similar to the structure of leak detection detecting head 1, and difference is no pressure sensor, without voltage stabilizing through-hole structure.As shown in Figure 6, plug 3.1 includes plug housing 3.1.2, plug bore seal 3.1.1 being located at plug housing 3.1.2 front end, is located at the plug sealing plate 3.1.3 of intersegmental part in plug housing 3.1.2 be fixed at the plug short axle 3.1.4 of plug sealing plate 3.1.3 rear end, be located at the plug adpting flange 3.1.5 of plug housing 3.1.2 afterbody coaxial with plug housing 3.1.2.Plug 3.1 realizes end face seal laminating (as shown in Figure 5) with tube sheet 7 by plug bore seal 3.1.1, or fits (as shown in Figure 7) with the tube wall conical surface seal of condenser pipe 6.Plug hold down gag and plug driving means 3.6 structure and hold down gag in leak detection detecting head, driving means is identical: by plug stage clip 31.3, plug compresses axle sleeve 3.5 and constitutes on the plug short axle 3.1.4 of the back segment that plug hold down gag is set in plug housing 3.1.2, it is connected by plug end cap 3.4 is fixing with plug adpting flange 3.1.5, and make plug sealing plate 3.13, plug stage clip 3.3, plug compresses axle sleeve 3.5, plug end cap 3.4 is mutually conflicted connection, and plug compresses axle sleeve 3.5 by plug driving means 3.6 drive connection, plug driving means 3.6 uses electromagnet apparatus or hydraulic cylinder or pneumatic cylinder or motor driver.
When the online leakage detection apparatus of condenser of the present invention carries out leak detection work, when the outer shape of the front end of hunt leak detecting head 1 and end cap 3 is circular ring structure, leak detection detecting head 1 this moment and end cap 3 simultaneously with the tube sheet 7 planar end gluing, sealing of tested condenser pipe 6;When the outer shape of the front end of hunt leak detecting head 1 and end cap 3 is frustum cone structure, leak detection detecting head 1 this moment and end cap 3 are fitted with tested condenser pipe 6 inner wall sealing in stretching into condenser pipe 6 simultaneously.
The online leakage detection apparatus of condenser of the present invention, as follows in its control method of the process that completes to hunt leak online:
Step one, control system 5 controls described mechanical arm 1 and described mechanical arm 24 along tube sheet 7 plane motion being parallel to condenser condenser pipe 6, it is accurately positioned leak detection detecting head 1 and end cap 3, the two ends that extremely tube sheet 7 plane of tested condenser pipe 6 or tested condenser pipe 6 is corresponding;
Step 2, control system 5 controls the leak detection detecting head 1 that is installed on mechanical arm 1 and the end cap 3 that is installed on mechanical arm 24 move forward simultaneously and fits with tested condenser pipe 6 inwall or with tube sheet 7 gluing, sealing of tested condenser pipe 6.
Concrete control mode is: control system 5 controls to be arranged on the driving means 1.6 on leak detection detecting head 1 and the plug driving means 3.6 on end cap 3 works, and driving leak detection detecting head 1 and end cap 3 move forward and compress and be arranged on the hold down gag driven on detecting head 1 and end cap 3.
Step 3, the leak detection built-in pressure sensor 1.2 of detecting head 1 senses the pressure change in tested condenser pipe 6, and is converted into pressure signal and is transferred to control system 5, and control system 5 records and export leak detection result;
Step 4, control system 5 control leak detection detecting head 1 and end cap 3 are returned to the initial position of step 2.
I.e. can complete a certain condenser pipe or the leak detection work of condenser pipe region (area size is configured by hole size in the bore seal of leak detection detecting head and end cap front end) by above-mentioned leak detection step, under control of the control system, continuously repeating above-mentioned steps, the online leakage detection apparatus of a kind of condenser of the present invention just can be fully completed the leak detection work to condenser with system.
Owing to there is vacuum characteristic when gas trap condensation chamber works, the most cool solidifying room is in the negative pressure state less than an atmospheric pressure, there is the leakage joint that mainly condenser pipe and condenser pipe are combined with tube sheet in gas trap condensation chamber, the present invention i.e. have employed and blocks condenser pipe or condenser pipe surrounding zone, form corresponding sealing area, if there being leakage, the pressure of this sealing area also can be less than an atmospheric pressure.The condenser pipe huge amount of condenser; it is heavy, a complicated and job for time-consuming length to its leak detection; shut down leak detection and also reduce production hour; and then affect business economic interests; the present invention has used control system and mechanical arm, it is achieved that automatic on-line leak detection controls, and can complete maintenance work of hunting leak in the case of non-stop-machine; can be that enterprise is cost-effective to increase economic efficiency, there is good practical value.

Claims (5)

1. a leak detection detecting head, this leak detection detecting head is for the leak detection of condenser condenser pipe;It is characterized in that: include housing, pressure sensor and driving means;Described housing forward end opening;Described pressure sensor is located in housing, is connected with housing seal, and enclosure interior is divided into pressure detecting chamber and former and later two cavitys of pressure stabilizing cavity;Described driving means is connected with housing rear end;When hunting leak, described housing forward end and condenser pipe week to be measured side pipe plate gluing, sealing, or described housing forward end stretch in condenser pipe to be measured with condenser pipe inwall gluing, sealing;Described housing is provided with voltage stabilizing through hole;Described voltage stabilizing through hole is connected with described pressure stabilizing cavity.
Leak detection detecting head the most according to claim 1, it is characterised in that: described leak detection detecting head also includes hold down gag;Described driving means is connected with housing rear end by hold down gag.
Leak detection detecting head the most according to claim 2, it is characterised in that: it is provided with sealing dividing plate and short axle in described housing;Described sealing dividing plate and housing, pressure sensor surround described pressure stabilizing cavity;Described short axle is positioned at housing rear end, and is connected with described sealing divider upright;Described hold down gag includes stage clip and compresses axle sleeve;Described stage clip and compression axle sleeve are placed on described short axle successively;Described compression axle sleeve one end is positioned at housing, and the other end stretches out housing and is connected with described driving means;Described sealing dividing plate, stage clip, compression axle sleeve and housing are the most mutually conflicted.
Leak detection detecting head the most according to claim 1, it is characterised in that: described pressure sensor uses B/P EGR Back Pressure Transducer EGR.
5. the method that the online leakage detection apparatus of condenser carries out condenser leakage detection, the online leakage detection apparatus of described condenser includes the arbitrary described leak detection detecting head of Claims 1-4;It is characterized in that: the online leakage detection apparatus of described condenser also includes plug, plug driving means, mechanical arm one, mechanical arm two and control system;Described mechanical arm one is connected with the driving means of described leak detection detecting head;Described mechanical arm two is connected with plug rear end by plug driving means;Described pressure sensor, mechanical arm one, mechanical arm two, plug driving means, the driving means of leak detection detecting head are connected with described control system respectively;When hunting leak, the tube sheet gluing, sealing of described plug front end and condenser pipe week to be measured side, or described plug front end stretch in condenser pipe to be measured with condenser pipe inwall gluing, sealing;Comprise the following steps:
(1) during described mechanical arm one, mechanical arm two lay respectively at two hydroeciums of described condenser;Described control system controls described mechanical arm one, mechanical arm two and moves in the plane be parallel to tube sheet, and positions described plug with leak detection detecting head respectively to the two ends that condenser pipe to be measured is corresponding;
(2) described control system is by controlling the driving means of described leak detection detecting head, plug driving means, make leak detection detecting head, plug move forward respectively, to leak detection detecting head front end, plug front end and condenser pipe week to be measured side pipe plate gluing, sealing or with condenser pipe inwall gluing, sealing to be measured;
(3) pressure sensor that sets in described leak detection detecting head senses the pressure change in region to be measured, transmits a signal to described control system, by described control system record and export leak detection result;
(4) described control system controls the driving means of described leak detection detecting head, plug driving means returns back to the initial position in step (2).
CN201410070808.7A 2014-02-28 2014-02-28 A kind of leak detection detecting head, the online leakage detection apparatus of condenser and application thereof Active CN103808475B (en)

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Effective date of registration: 20170123

Address after: Water Pavilion Road Jiangning District moling street Nanjing City, Jiangsu province 211100 No. 1266

Patentee after: Nanjing Sciyon Automation Group Co., Ltd.

Patentee after: Nanjing Electric Power Plant of Datang Group

Address before: Water Pavilion Road Jiangning District moling street Nanjing City, Jiangsu province 211100 No. 1266

Patentee before: Nanjing Sciyon Automation Group Co., Ltd.