CN-122014984-A - Low-pressure steam pipe network drainage on-line monitoring device and method

CN122014984ACN 122014984 ACN122014984 ACN 122014984ACN-122014984-A

Abstract

The invention discloses a low-pressure steam pipe network drainage on-line monitoring device and a method, wherein the low-pressure steam pipe network drainage on-line monitoring device comprises a drainage valve group, a temperature sensing module, a signal receiving and transmitting module and a monitoring module, wherein the temperature sensing module is used for measuring the temperature before a drain valve and the temperature after the drain valve on line in real time, an expected model is built in an alarm unit in the monitoring module, and the alarm unit is used for comparing the change rule of the temperature before the drain valve, the temperature after the drain valve and the real-time temperature difference with the expected change rule to analyze the state of the drain valve continuously, on line and automatically, so that whether the drain valve of the low-pressure steam pipe network works normally can be rapidly and effectively judged.

Inventors

JIANG CHUNMING
GUO JIANHUI
LIU GUANGJIE
DU YANG
LIN JINGFENG
FANG ZHIJUN
Pan Bibo

Assignees

江西铜业股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260211

Claims (4)

1. The low-pressure steam pipe network drainage on-line monitoring device is characterized by comprising a drainage valve group, a temperature sensing module, a signal receiving and transmitting module and a monitoring module, wherein the drainage valve group is connected with the temperature sensing module; The low-pressure steam pipe network comprises a steam pipe and a condensate recovery pipe, wherein one end of the steam pipe is communicated with one end of the condensate recovery pipe, and a drain valve group is arranged at the communication position; The drain valve group comprises a front stop valve, a drain valve and a rear stop valve which are sequentially arranged along the medium flow direction in a low-pressure steam pipe network, wherein the front stop valve is arranged at the inlet of the condensate recovery pipe; The input end of the temperature sensing module comprises a first measuring point and a second measuring point, the first measuring point is connected with an inlet side pipeline of the drain valve, and the second measuring point is connected with an outlet side pipeline of the drain valve; The input end of the signal receiving and transmitting module is in communication connection with the output end of the temperature sensing module; the signal receiving and transmitting module comprises a gateway and a transparent transmission unit, wherein the temperature sensing module transmits data to the gateway, and the transparent transmission unit transmits the data to the monitoring module; The monitoring module comprises an alarm unit, wherein an expected model is built in the alarm unit, the expected model comprises expected pre-trap temperature, expected post-trap temperature and expected change rules of the pre-trap temperature and the pre-post-trap temperature difference of the steam trap in a working period, the expected change rules are saw-tooth or pulse-like periodic fluctuation curves, the expected temperature difference of the steam trap is gradually increased when the steam trap is closed, the temperature difference of the steam trap is gradually increased when the steam trap is opened, the temperature difference of the steam trap is suddenly reduced, and the alarm unit compares the change rules of the pre-trap temperature, the post-trap temperature and the real-time temperature difference with the expected change rules for analysis: If the real-time temperature difference value accords with the expected change rule, the trap works normally, if the real-time temperature difference value is lower than the expected change rule by 5-10 ℃, leakage exists in the trap, the real-time temperature difference value is higher than 60-100 ℃ and has no periodic fluctuation, blockage exists in the trap, the periodic heating characteristic of temperature data behind the trap disappears, and blockage or leakage exists in the trap; if the drain valve is blocked or leaked, the alarm unit sends out a leakage or blocking alarm signal to the user side.
2. The low-pressure steam pipe network drainage on-line monitoring device according to claim 1, wherein the temperature sensing module is a wireless double-measuring-point temperature sensor, and the wireless double-measuring-point temperature sensor is a hoop-mounted temperature sensor or a patch-mounted temperature sensor.
3. The low pressure steam pipe network drainage on-line monitoring device of claim 1, wherein the distance between the first measuring point or the second measuring point and the drainage valve is 10 cm to 20 cm along the extension direction of the steam pipe.
4. A low pressure steam pipe network drainage on-line monitoring method for the low pressure steam pipe network drainage on-line monitoring device as claimed in any one of claims 1 to 3, comprising the steps of: The alarm unit is internally provided with an expected model, wherein the expected model comprises an expected change rule of the temperature before the drain valve, the temperature after the expected drain valve and the temperature difference before and after the expected drain valve in one working period, the expected change rule is a saw-tooth or pulse-shaped periodic fluctuation curve, and the expected change rule comprises that the temperature difference before and after the expected drain valve is gradually increased when the drain valve is closed; the temperature sensing module acquires temperature data before the drain valve and temperature data after the drain valve; Transmitting the collected temperature data before the drain valve and the collected temperature data after the drain valve to the monitoring module through a signal receiving and transmitting module; In the monitoring module, the alarm unit dynamically compares the real-time temperature difference value between the real-time monitored temperature data before the trap and the real-time temperature data after the trap with the expected change rule: If the real-time temperature difference value accords with the expected change rule, the trap works normally, if the real-time temperature difference value is lower than the expected change rule by 5-10 ℃, leakage exists in the trap, the real-time temperature difference value is higher than 60-100 ℃ and has no periodic fluctuation, blockage exists in the trap, the periodic heating characteristic of temperature data behind the trap disappears, and blockage or leakage exists in the trap; if the drain valve is blocked or leaked, the alarm unit sends out a leakage or blocking alarm signal to the user side.

Description

Low-pressure steam pipe network drainage on-line monitoring device and method Technical Field The invention relates to the technical field of industrial equipment state monitoring, in particular to a low-pressure steam pipe network drainage on-line monitoring device and method. Background In the industrial fields of chemical industry, textile industry, food industry and the like, a steam pipe network is a core energy source conveying system. The steam releases latent heat and condenses into water during use. This condensate must be drained out of the system through the trap in a timely and efficient manner. If the drain valve fails (such as blockage can not drain water or leakage leads to direct steam discharge), a 'water hammer' phenomenon can be caused, pipeline equipment is damaged by impact, and energy waste and steam quality reduction are caused. The low-pressure steam pipe network (usually the pressure is lower than 1.0 MPa) is more prone to failure due to the fact that the operating pressure of the low-pressure steam pipe network fluctuates greatly. Currently, the monitoring of the state of a trap mainly depends on manual regular inspection, and judgment is performed through a sound, touch or portable detector. The method has the obvious defects of untimely monitoring, incapability of capturing sudden faults, long inspection period, lag fault discovery, difficulty in ensuring judgment accuracy depending on personnel experience, high labor cost and low efficiency. In the prior art 1 (application number: 202021884778.0, application day: 2020.09.01), a steam trap leakage and blockage on-line monitoring system is disclosed, wherein three temperature detectors are specifically installed outside a steam pipeline, a condensate tank and a trap, the temperature sensor outside the trap is not connected with a drain inlet and a drain outlet, temperature data are analyzed through a distributed control system, and if leakage occurs, an audible and visual alarm can be triggered, and in actual use, whether the trap fails can not be accurately judged because the actual temperature of the drain inlet and the drain outlet can not be measured, meanwhile, the fault condition can not be distinguished until the audible and visual alarm needs to be checked by staff in actual, and real-time automatic monitoring can not be completely realized. In the prior art 2 (application number: 202411936738.9, application day: 2024.12.26), an internet-based steam pipe network drainage monitoring and diagnosing system is disclosed, data are transmitted to a cloud diagnosis module through the internet by collecting pipe network pressure, temperature, water quality hardness, drainage port water flow images and scale images, drainage probability is calculated by combining pressure and temperature influence values, whether drainage is needed or not is judged, the calculation process is complex, and the temperature and the pressure at any position in the pipe network are not acquired, data acquisition is possibly needed due to shutdown or fire movement, the operation is complex, and automatic online monitoring cannot be realized. Therefore, the technical problems to be solved in the field are urgent to be solved in 1 how to realize real-time, online and automatic monitoring of the working state of the drain valve, 2 how to accurately diagnose the fault type of the drain valve, and 3 how to realize the acquisition of the temperature data of the drain valve without shutdown. Disclosure of Invention In view of the above, the invention provides a low-pressure steam pipe network drainage on-line monitoring device and a low-pressure steam pipe network drainage on-line monitoring method, which are used for solving the problems of 1, how to realize real-time on-line and automatic monitoring of the working state of a drain valve, 2, how to accurately diagnose the fault type of the drain valve, and 3, how to realize the acquisition of temperature data of the drain valve without shutdown. The invention provides a low-pressure steam pipe network drainage on-line monitoring device which is used for a low-pressure steam pipe network and comprises a drainage valve group, a temperature sensing module, a signal receiving and transmitting module and a monitoring module; The low-pressure steam pipe network comprises a steam pipe and a condensate recovery pipe, wherein one end of the steam pipe is communicated with one end of the condensate recovery pipe, and a drain valve group is arranged at the communication position; The drain valve group comprises a front stop valve, a drain valve and a rear stop valve which are sequentially arranged along the medium flow direction in a low-pressure steam pipe network, wherein the front stop valve is arranged at the inlet of the condensate recovery pipe; The input end of the temperature sensing module comprises a first measuring point and a second measuring point, the first measuring point is connected with an inlet side pi