CN202938001U

CN202938001U - Steam pipeline drain valve leakage monitoring system

Info

Publication number: CN202938001U
Application number: CN 201220668421
Authority: CN
Inventors: 薛嫣; 毕建惠; 梁柏宏
Original assignee: Northwest Electric Power Design Institute of China Power Engineering Consulting Group
Current assignee: Northwest Electric Power Design Institute of China Power Engineering Consulting Group
Priority date: 2012-12-05
Filing date: 2012-12-05
Publication date: 2013-05-15
Anticipated expiration: 2022-12-05

Abstract

The utility model discloses a steam pipeline drain valve leakage monitoring system which comprises a plurality of temperature measuring elements, wherein the plurality of temperature measuring elements are arranged on a valve rear pipeline behind corresponding steam pipeline drain valves and are connected with a display system located in a control room. According to the steam pipeline drain valve leakage monitoring system, thermocouples are adopted to measure temperature of the rear side of the steam pipeline drain valves, leakage of the drain valves can be found out fast, and a drain valve which breaks down can be positioned accurately. The steam pipeline drain valve leakage monitoring system is economical, reliable, convenient to change, low in cost and high in precision due to the adoption of ordinary thermocouples.

Description

Steam line trap leaking monitoring system

Technical field

The utility model relates to the monitoring of steam line drain valve field, particularly a kind of steam line trap leaking monitoring system.

Background technique

In plant project, energy-saving and cost-reducing, energy-saving and emission-reduction have become owner's one of important performance assessment criteria in power plant construction.And the steam heat loss is one of key factor that affects these indexs.

In unit operation, the phenomenon of steam heat loss happens occasionally, and the leakage of drain valve is one of the main reasons, so find that early the leakage of drain valve and the order of severity, the trend of leakage are to avoid, reduce the prerequisite of heat loss.But the early warning measure of trap leaking is very weak at present, when finding often to have the steam heat loss, just begins to search reason, and so is distributed in a large number the drain valve of diverse location, and wanting quickly and accurately, fixed point location is also extremely difficult! So, seek and a kind ofly find that effectively, fast, accurately, as early as possible, in time the method for trap leaking situation, position and means are task of top priority!

The model utility content

The purpose of this utility model is to provide a kind of steam line trap leaking monitoring system, to solve the problems of the technologies described above.

To achieve these goals, the utility model adopts following technological scheme:

A kind of steam line trap leaking monitoring system comprises some temperature measuring elements, and described some temperature measuring elements are arranged at after valve after corresponding steam line drain valve on pipeline, and these temperature measuring elements connect the display system that is positioned at the control room.

Preferably, described temperature measuring element is common thermocouple.

Preferably, described some temperature measuring element correspondences be arranged at main vapour in power plant, again after the valve after the drain valve of heat, high other, low other steam line on pipeline.

Preferably, described some temperature measuring element correspondences be arranged in power plant one section draw gas, two sections draw gas, after the valve after the drain valve of three sections steam lines that draw gas on pipeline.

For prior art, the utlity model has following advantage with existing:

1, temperature after the utility model employing thermocouple monitoring steam line drain valve, can find rapidly trap leaking, can accurately locate the drain valve that breaks down;

2, temperature measuring element is selected common thermocouple, economical, reliable, change convenient, cost is low, precision is high;

3, in view of in power plant, high pressure steam pipework hydrophobic pipeline heat loss is larger on the impact of unit operation and energy consumption index, and corresponding drain valve maintenance, replacing, cost are very high; Therefore measuring point is set pointedly, can play the effect that uses the best steel to make the knife's edge, realize energy-saving and emission-reduction, energy-saving and cost-reducing target.

Description of drawings

Fig. 1 is main steam, heat and reject steam system pipeline structural representation again;

Fig. 2 is steam bleeding system pipeline structure schematic diagram.

Embodiment

Describe the technical solution of the utility model in detail below in conjunction with accompanying drawing.

See also illustrated in figures 1 and 2, a kind of steam line trap leaking of the utility model monitoring system, comprise a plurality of common thermocouples (TE) 2, these thermocouples are arranged at after valve after the drain valve 1 of corresponding monitoring on pipeline, these thermocouples 2 connect the display system that is positioned at the control room, and display system shows the temperature of corresponding thermocouples 2 monitorings in real time.After the utility model adopts the steam line drain valve, temperature is monitored, and can find rapidly trap leaking, can accurately locate the drain valve that breaks down.Under normal circumstances, steam line drain valve 1 is closed condition, hydrophobic generation does not have in pipeline after valve, if the hydrophobic leakage that the reasons such as drain valve is poorly sealed, damage cause occurs, pipeline medium temperature can change at once, can monitor constantly this section drain water piping whether hydrophobic generation is arranged therefore corresponding temperature point is set after valve, find rapidly the generation of hydrophobic leakage, also can accurately locate is which drain valve goes wrong; Temperature element (TE is selected thermocouple, economical, reliable, change convenient, cost is low, precision is high.

In the power plant process system, main steam, heat and reject steam system again, steam bleeding system is the high pressure steam line, temperature is higher; If heat loss appears in these systems, larger to unit operation index, effectiveness affects, therefore it is very meaningful in these systems, the monitoring point to be set.In addition, boiler plant's body interior boiler circuit also can arrange after its steam line drain valve, and set-up mode, principle are identical, no longer accompanying drawing.

Referring to Fig. 1, main vapour, the rear set temperature measuring point of drain valve 1 of heat, high other, low other steam line again adopt the TE thermocouple element, to the control room, the operations staff are monitored constantly in a distant place, control room the signal is far passed.

Referring to Fig. 2, one section draw gas, two sections draw gas, the rear set temperature measuring point of drain valve 1 of three sections extraction lines, adopt the TE thermocouple element, to the control room, the operations staff is monitored constantly in a distant place, control room the signal is far passed.

In power plant, high pressure steam pipework hydrophobic pipeline heat loss is larger on the impact of unit operation and energy consumption index, and corresponding drain valve maintenance, replacing, cost are very high; Therefore measuring point is set pointedly, can play the effect that uses the best steel to make the knife's edge, realize the target of energy-saving and emission-reduction.

Above content is in conjunction with concrete preferred implementation further detailed description of the utility model; can not assert that embodiment of the present utility model only limits to this; for the utility model person of an ordinary skill in the technical field; without departing from the concept of the premise utility; can also make some simple deduction or replace, all should be considered as belonging to the utility model and determine scope of patent protection by claims of submitting to.

Claims

1. steam line trap leaking monitoring system is characterized in that: comprise some temperature measuring elements, described some temperature measuring elements are arranged at after valve after corresponding steam line drain valve on pipeline, and these temperature measuring elements connect the display system that is positioned at the control room.

2. a kind of steam line trap leaking monitoring system according to claim 1, it is characterized in that: described temperature measuring element is common thermocouple.

3. a kind of steam line trap leaking monitoring system according to claim 1 is characterized in that: described some temperature measuring element correspondences are arranged at main vapour in power plant, again after the valve after the drain valve of heat, high other, low other steam line on pipeline.

4. a kind of steam line trap leaking monitoring system according to claim 1 is characterized in that: described some temperature measuring element correspondences be arranged in power plant one section draw gas, two sections draw gas, after the valve after the drain valve of three sections steam lines that draw gas on pipeline.