CN103344351A - Digital heating pipeline monitoring system - Google Patents

Abstract

A digital heating pipeline monitoring system includes an industrial control host computer and multiple detection nodes. Each detection node includes a plurality of temperature sensors and a single-chip lower computer, wherein the industrial control upper computer and each detection node all contain a set of wireless transceiver circuits; wherein each temperature sensor is used to detect the temperature of the heating pipeline, and The detected temperature signal is sent to the lower computer of the single-chip microcomputer; the lower computer of the single-chip microcomputer preprocesses the temperature signal received, and then sends the temperature data to the upper computer of industrial control through the wireless transceiver circuit; the upper computer of industrial control The computer receives the temperature data sent by each detection node in real time, and displays it on the pipe network diagram on the screen. At the same time, it records and saves the temperature value and change value of each sensor, and generates a temperature distribution diagram within the detection node, as well as the temperature of each temperature sensor. The change comparison chart can quickly and efficiently determine the fault point.

Description

Digital heating pipeline monitoring system

technical field

The invention relates to a pipeline monitoring system, in particular to a digital heating pipeline monitoring system realized by computer technology.

Background technique

Pipeline construction is generally buried deep underground as a concealed project, and because the units undertaking the project are distributed in various places, the project implementation personnel have a high mobility, and the quality and level of personnel are different, so pipeline failures are inevitable. Once a fault occurs during pipeline operation, it is difficult to determine the fault point, so the cost of manpower and material resources will be very considerable.

During the operation of long-distance hot steam pipelines, they are usually affected by the internal and external environments, resulting in damage to the pipelines and loss of heat energy. The rupture of the inner pipe is mainly caused by the combination of high temperature and high pressure hot steam, and the internal stress of the pipeline; the corrosion of the outer pipe is usually caused by the damage and failure of the coating, as well as the acid and alkali of the groundwater. In recent years, with the mainstream requirements of energy saving, low-carbon and environmental protection, centralized gas supply and pipeline hot gas have shifted from heating to enterprise production gas. At present, the gas temperature of the steam pipe network has reached 350°C and the pressure is 1.3Mpa. Therefore, the inner pipe Welding failures occur frequently.

In recent years, with the wide application and popularization of computer technology, the detection technology at home and abroad has developed rapidly, and the single-layer pipeline detection technology has gradually formed two branches of pipeline inner and outer wall detection technology (coating detection, intelligent detection). Under normal circumstances, the coating is damaged and the pipeline below the failure is also corroded. The purpose of the single-layer pipeline external inspection technology is to detect the corrosion defects of the pipe body by digging pits on the basis of detecting the effectiveness of the coating and cathodic protection. , which is very effective for pipeline detection in most current layouts. In-pipeline inspection technology is mainly used to find defects such as internal and external corrosion, local deformation, and weld cracks in the pipeline, and can also indirectly judge the integrity of the coating.

At present, the main development direction of corrosion control of long-distance gas pipelines at home and abroad is in the aspect of external anti-corrosion, so pipeline inspection also focuses on coating defects and external pipeline defects caused by external corrosion. However, there is currently no good way to detect the inner pipeline of the double-layer hot gas pipe (see Figure 1).

At present, the common method of double-layer inner pipe detection is to install the air outlet at a unit of 50 meters. Once the inner pipe ruptures, high-temperature steam will be ejected from the air outlet through the steel protective pipe. Therefore, it can be determined that the fault is within the 50-meter unit and reported by the masses. Or full-time personnel inspect and find the faulty unit, and then organize personnel to dig a pit for inspection. Generally, it takes three or four excavations to find the fault point. For the excavation and landfill project, the cost per meter exceeds 10,000 yuan, and it also needs to go through multiple departments. Approval can be said to be a waste of money and time, and the loss of heat loss caused by the delay is also considerable.

Contents of the invention

In order to solve the above technical problems, the present invention provides a digital heating pipeline monitoring system.

The technical solution adopted by the present invention to solve its technical problems is as follows:

A digital heating pipeline monitoring system, including an industrial control upper computer and a plurality of detection nodes, characterized in that each detection node includes a plurality of temperature sensors and a single-chip lower computer, wherein the industrial control upper computer and each detection node Each contains a set of wireless transceiver circuits; wherein each temperature sensor is used to detect the temperature of the heating pipeline, and sends the detected temperature signal to the lower computer of the single-chip microcomputer; the lower computer of the single-chip microcomputer receives the temperature signal from each of the temperature sensors , then preprocess the received temperature signal, and then send the processed temperature data to the industrial control host computer through the wireless transceiver circuit; the industrial control host computer receives the data sent by each detection node in real time The temperature data is displayed on the pipe network diagram on the screen, and the temperature value and change value of each sensor are recorded and saved at the same time. According to the data, the temperature distribution diagram in the detection node and the temperature change comparison diagram of each temperature sensor are generated.

According to the monitoring system of the above technical solution, each detection node also includes a sensor transmitter corresponding to each temperature sensor and a signal amplification and conversion circuit, and the sensor transmitter collects sensor data and sends it to the signal amplification and conversion circuit. The circuit, the signal amplification and conversion circuit receives the temperature signal transmitted by the transmitter, processes, amplifies and converts the received signal and sends it to the lower computer of the single-chip microcomputer.

According to the monitoring system of the technical solution above, the signal amplification and conversion circuit is composed of a bridge, a low-pass filter, a differential amplification circuit, and a voltage-frequency conversion circuit.

According to the monitoring system of the above technical solution, wherein the wireless transceiver circuit works in the ISM frequency band.

According to the monitoring system of the above technical solution, the wireless transceiver circuit adopts the NORDIC nRF24E1 wireless chip.

According to the monitoring system of the above technical solution, wherein the temperature sensor is a platinum thermal resistance.

According to the monitoring system of the above technical solution, wherein the platinum thermal resistance is PT100.

According to the monitoring system of the above technical solution, the industrial control host computer can use the temperature point analysis method to determine the pipeline leakage point according to the generated temperature distribution map in the node and the temperature change comparison map of each temperature sensor.

The digital heating pipeline monitoring system of the present invention is a data information system that utilizes computer technology to realize collection, processing, storage, management, query, analysis and description of distribution of heating pipelines and working status. The digital heating pipeline monitoring system has the functions of heating pipeline information data management, distribution map, fault analysis, graphic visualization, fault data query and analysis, etc. This system can use computer to realize complex pipeline model, form high operating efficiency, determine fault point accurately, and monitor in real time. It is a powerful multimedia platform product.

Description of drawings

Fig. 1 is a schematic diagram of double-layer hot gas pipe structure;

Figure 2 is a system block diagram of the pipeline monitoring system.

The meanings of the reference signs are as follows:

1: Working steel pipe

2: Inorganic insulation layer

3: steel belt

4: protective layer

5: Steel casing

6: anti-corrosion layer

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Detailed ways

as shown in picture 2. The pipeline monitoring system includes an industrial control host computer and multiple detection nodes. The industrial control host computer and each detection node contain a set of wireless transceiver circuits, which have wireless data transmission and forwarding functions. A detection node is arranged every predetermined distance in the heating pipeline, and each detection node includes a plurality of temperature sensors and a single-chip microcomputer used as a lower computer. In addition, each detection node also includes a flyer transmitter and a signal amplification and conversion circuit for signal transmission and processing. Those skilled in the art can select the distance between each detection node and the distance between each sensor according to the actual situation, for example, a detection node can be set every 100 meters, a temperature sensor can be set every 10 meters, and each node contains 10-15 Temperature Sensor.

The temperature sensor of this system may be various commonly used temperature sensors in the field, such as a resistance temperature sensor. Platinum thermal resistance is preferred, such as platinum thermal resistance PT100. Platinum thermal resistance is a sensor with high precision and high sensitivity. Its linear temperature resistance is better than other resistance thermal sensors, with stable performance, high reliability and strong overload capacity. Among them, the measurement range of the platinum thermal resistance PT100 is 0°C to 350°C, and the measurement resolution is ±0.1°C.

The temperature signal measured by the temperature sensor is transmitted to the lower computer of the single-chip microcomputer through the sensor transmitter and the signal amplification and conversion circuit. The sensor transmitter collects sensor data and sends it to the signal amplification and conversion circuit. The signal amplification and conversion circuit receives the temperature signal transmitted by the transmitter, processes, amplifies and converts the received signal and sends it to the lower computer of the single-chip microcomputer. The signal amplification and conversion circuit is composed of a bridge, a low-pass filter, a differential amplifier circuit and a V-F (voltage-frequency) conversion circuit. Through the voltage amplification and conversion circuit, the temperature signal change of 0 ℃ ~ 350 ℃ measured by the sensor can be converted into a frequency of 0 ~ 100KHz, so that the single chip microcomputer can directly convert the temperature value. The single-chip microcomputer of each detection node converts the temperature data obtained and sends it to the industrial control host computer through the wireless transceiver circuit.

In addition, in order to prevent the system from being affected and damaged due to excessive fault temperature, the signal line used in this system is preferably a high-temperature signal line, and it is placed outside the trachea sheath tube, and anti-corrosion measures are taken at the same time.

With the development of wireless networks and the expansion of application fields, working in the 2.4GHz free frequency band of the ISM (Industry, Science and Medicine) standard has become the focus of research. For example, wireless transmission protocols such as Wi-Fi, BlueTooth, and Zigbee are all applied in the 2.4GHz frequency band, and are widely used in various fields such as scientific research, family, industry, and military due to their high data rate and wide node distribution. The wireless transceiver circuit module in the present invention is based on the NORDIC nRF24E1 wireless chip. It is a wireless transceiver module with an enhanced 8051 core. It is suitable for various wireless device interconnection applications. It works in the ISM frequency band and has 125 frequency bands. It can realize point-to-point and point-to-multipoint wireless communication, and at the same time, frequency changing and frequency hopping can be used to avoid interference. The system has been widely used in the collection and processing of wireless environment parameters. Of course, the wireless transceiver circuit module in the present invention can also use other types of commonly used wireless chips.

The main function of the industrial control upper computer in the present invention is to receive the temperature data from the detection nodes of the lower computer in real time and display it on the pipe network diagram on the screen. At the same time, record and save the temperature value and change value of each sensor, generate a temperature distribution map in the detection node according to the data, and a comparison map of the temperature change of each temperature sensor, and analyze and infer the fault point from this, and print the maintenance position dispatch order of the detection node .

The monitoring system of the present invention adopts the temperature analysis method to analyze and deduce the fault point, and the specific process is as follows:

When a sudden leak occurs somewhere on the pipeline, a transient temperature rise will occur in the insulation chamber at the leak, forming a high temperature point. The temperature propagates from the leakage point to the air outlets at both ends at a certain speed, and the temperature decays with a normal distribution. The leakage detection can be carried out according to the specific transient temperature distribution captured by the temperature sensors distributed in the insulation chamber. The leakage point can be determined according to the time difference and temperature distribution of each temperature sensor receiving the temperature signal.

The above-mentioned embodiments are only one of the preferred specific implementations of the present invention, and ordinary changes and substitutions made by those skilled in the art within the scope of the technical solutions of the present invention shall be included in the protection scope of the present invention.

Claims (8)

1. digitizing heat supply pipeline supervisory system, comprise Industry Control host computer and a plurality of probe node, it is characterized in that: each probe node comprises a plurality of temperature sensors and single-chip microcomputer slave computer, and wherein said Industry Control host computer and each probe node all contain a cover wireless transceiver circuit; Wherein

Each temperature sensor is for detection of the temperature of heat supply pipeline, and detected temperature signal is sent to the single-chip microcomputer slave computer;

Described single-chip microcomputer slave computer receives the temperature signal from each described temperature sensor, then the temperature signal that receives is carried out pre-service, and the temperature data that will obtain after then will handling sends to described Industry Control host computer by described wireless transceiver circuit;

Described Industry Control host computer receives the temperature data that each probe node is sent in real time, and be presented on the pipe network figure of screen, temperature value and the changing value of each sensor preserved in record simultaneously, generate temperature profile in the probe node according to these data, and each temperature sensor temperature variation comparison diagram.

2. supervisory system according to claim 1, wherein each probe node comprises that also the sensor transducer corresponding with each temperature sensor and signal amplify and change-over circuit, described sensor transducer collecting sensor data also send to signal amplification and change-over circuit, signal amplifies the temperature signal that transmits with change-over circuit reception transmitter, sends to the single-chip microcomputer slave computer after handling to the received signal, amplify and changing.

3. supervisory system according to claim 2, wherein said signal are amplified with change-over circuit and are made up of electric bridge, low-pass filter, differential amplifier circuit, voltage-frequency converting circuit.

4. according to any one described supervisory system among the claim 1-3, wherein said wireless transceiver circuit is operated in ISM band.

5. supervisory system according to claim 4, wherein wireless transceiver circuit adopts NORDIC nRF24E1 wireless chip.

6. supervisory system according to claim 1, wherein said temperature sensor is platinum resistance thermometer sensor.

7. supervisory system according to claim 4, wherein said platinum resistance thermometer sensor, is PT100.

8. according to any one described supervisory system among the claim 1-3, wherein the upper function of Industry Control utilizes the temperature spot analytic approach to determine the pipe leakage point according to the intranodal temperature profile and each the temperature sensor temperature variation comparison diagram that generate.

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