RU1783231C - Method and device for detecting leakage in stationary heat pipeline for open and closed heat supply systems - Google Patents

Abstract

SUMMARY OF THE INVENTION: the charge flow rate of the heating network, the supply and return network water, the pressure of the supply network water are measured and the difference in the measured values is determined. At regular intervals, the recharge rates of the heating system, supply and return water and the pressure of the supply water are re-measured. Compare the value of each parameter at the current time with its value at the previous moment. If the differences in the values of the feed water flow rates and in the return pipe are greater than zero, and the flow rate in the supply pipe and the pressure in the supply manifold are less than zero, a signal is generated for the protection system to be triggered. For measurement, flow sensors for the supply water, return network water, heating network supply, and supply pressure are installed network water, logic device and timer. 2 pp. F-ly, 1 ill.

Description

The invention relates to energy, in particular, to improving the safety and reliability of a heat source, for example, a combined heat and power plant (CHP), with leaks in pipelines of an open or closed heating network within it and can relate to other industries, for example, to water supply.

A known method and device for its implementation of remote detection of damaged sections of the heating network, which uses the unbalance of the flow of network water in the supply and return pipelines as an indicator of leakage.

This device is not applicable for detecting leaks in heat pipes within the heat source (station heat pipes) and is designed only for closed heat supply systems. Which significantly reduces its scope.

The closest to the invention in terms of technical nature and the achieved result is a method of protecting a thermal power plant against flooding and a device for its implementation, in which, in addition to balancing the flow rates in the supply and return heat conduits, the flow rate of the heating water and the pressure at characteristic points of the heating mains are taken into account for leak detection

The disadvantage of this method (and, as a consequence, of the device) is that it does not allow to detect fast pipeline ruptures, characterized by significant gradients of the flow determining parameters, to be detached from transients of normal modes, and does not allow the need to correct VJ

oo

from th

00

. "

trials of the settings of the operation of the protective devices when the thermal circuit changes, as well as the greater likelihood of false alarms and insufficient diagnostic accuracy when working in open heat supply circuits.

The purpose of the invention is to expand the scope of application by operating at large gradients that determine the flow of parameters while reducing the likelihood of false positives and increasing accuracy.

This goal is achieved by measuring the costs of the j-network supply, supply and return network water supplies, the pressure in the supply network water collector, and comparing the values of each of these parameters at the current time with its value at the previous time If changes in the values for each of the measured parameters simultaneously determine a certain direction of the measured parameters (feed water flow rate and in the return pipe are greater than zero, and the flow rate in the supply pipe and the pressure in the supply manifold less than zero), a signal is generated to activate the protection system. For this, a device containing a flow sensor of the supply network water, a flow sensor of the return network water, a flow sensor of the heating network supply, a pressure sensor in the supply manifold of the network water, a logic device and a timer, four a signal processing channel, the input of each of which is connected to the output of the corresponding sensor, and the output to the corresponding input of the logical device, as well as the log counts connected in series a physical device, the input of which is connected to the first output of the logic device, and the signal generation block of the protection system, wherein each signal processing channel consists of series-connected information input blocks, the first input of which is the input of the signal processing channel, the second input is connected to the first output of the timer, a delay unit, the second input of which is connected to the second output of the timer, the first switch, the memory unit, the second switch and the analysis unit, the output of which is the output of the channel signal processing, and the output of the input unit is connected to the second input of the analysis unit, the output of the analysis unit is connected to the second inputs of the first and second switches, the third inputs of which are connected to the second output of the logic device and the fourth input of the second switch is connected to the output of the delay unit, the second output the logical device is connected to the second input of the counter of the number of operations of the logical device.

The drawing shows a device that implements the method in the form of a block diagram. It contains a sensor 1 for measuring the flow rate of the network water in the supply pipe, a sensor 2 for the consumption of the network water in the return pipe, network water, a sensor 3 for the flow rate of the make-up water of the heating network, a pressure sensor 4 in the supply collector of the network water, a signal processing channel 5 of the sensor 1, a processing channel 6 signal of sensor 2, channel 7 of signal processing of sensor 3, channel 8 of signal processing of sensor 4, logic device 9, counter 10 of the number of responses of logic device 9, signal generation block of the protection system 11. Each channel 5 6,7,8 the signal processing of the sensor consists of an information input unit 12, a signal delay unit 13, switches 14, 15, a memory unit 16, an analysis unit 17, the device also includes a timer 18.

The device operates as follows

In the heating main, sensors 1, 2, 3, 4 constantly measure the flow rate of the supply water in the supply pipe and the flow rate of the supply water in the return pipe, as well as the flow rate of the heating water supply and the pressure in the supply water collector.

The result of each measurement, for example, the flow rate of water in the supply pipe by the sensor 1, is supplied to the information input unit 12. The output of the information input unit 12 is fed to the input of the delay unit 13, where the signal is delayed for one step of the operation of the device. The output signal of the delay unit 13 is supplied simultaneously through the switch 14 to the memory unit 16 and through the switch 15 to the analysis unit 17, where the simultaneously received signals of the previous (delayed in the delay unit 13) step I are compared with the subsequent step 1 + 1. The time interval between steps is not more than 1s.

If the result of comparing the signals of step 1 + 1 with step I is zero or corresponds to the permissible direction of the parameter, then there is no signal at the output of analysis block 17, and the block itself is prepared for analysis of the signals of the next step, that is, to compare the signals of step 1 + 2 with the step signal 1 + 1, etc.

When comparing the signals of the next step with the previous one (in + 1 s in) reveals

the presence of a signal in the emergency direction of the parameter, at the output of the analysis block 17, a signal appears that simultaneously switches the switches 14, 15 and enters the input of the logic device 9, made according to scheme I.

When the analysis unit 17 commands to switch the switches, the switch 14 closes the access of new information from the delay unit 13 to the memory unit 16. After switching the switches 14 and 15 at the next steps of the device, the signals of each subsequent step will be compared with the last one in which there was no signal at the output of analysis block 17 (for example, if the output of the analysis block 17 was a fork when comparing the signals of steps i + 3 with i + 2, then the signals of steps i + 4, 1 + 5, i + 6 and etc. will be compared with the signal w stored in the memory unit 16 - n + 1 2)

Simultaneously with the switching of switches 14 and 15, the output signal of the analysis unit 17 of the channel 5 for processing the signal of the sensor 1 is fed to the input of the logic device 9. Similar signals from the channels 6,7,8 of the signal processing of the sensors 2,3,4 are also received. In the event that all four signals from channels 5, 6, 7, 8 of sensor signal processing 1,2, 3, 4 simultaneously arrive at the input of logic device 9, then its output device is triggered, the signal of which is supplied to the input of counter 12 of the number of operations of the logical device 9. The presence of the counter is due to the fact that the technological parameter goes beyond the norm (that is, the signal value at (in + 1) -in does not correspond to the permissible direction of the parameter) can be random and short-term, and the protection should only occur in case of an accident If the counter 10 detects the presence of a signal at the input for 4 consecutive steps (it may be more or less depending on the specific protection circuit), then a signal appears at its output which, having passed the block for generating the response signal of the protection system 11, is supplied to the executive part of the protection circuit.

In the event that at least one of the four signals from the sensor signal processing channels 5,6,7,8 is not input to the logic device 9 (at any step of the device), the other output device of the logical device 9 is triggered, the signal of which switches 14 and 15 to the initial position, reset counter 10. and the device continues to work according to the described algorithm from the initial state.

The proposed invention minimizes the likelihood of false triggering or failure of the protection, has high sensitivity and accuracy, allows you to programmatically and algorithmically disregard the process history, identify quick pipeline ruptures characterized by significant gradients of the determining parameters, to be removed from transient processes of normal modes, to refuse from the need to adjust the settings of the operation of the protection devices when changing the thermal circuit or mode work.

This technical solution is applicable to any heat supply schemes.

Claims (1)

1. A method for detecting leaks in station heat pipes for open and closed heat supply systems, the method comprising: measuring the feed rate of the heating network, the supply and return network water and the pressure of the supply network water, and determining a difference in the measured flow rates, which is equal to the time intervals re-measure the recharge costs of the heating network, supply and return network water and the pressure of the supply network water, compare the value of each parameter at the current time with its value in the previous the th moment and if the difference in the values of the feed water flow rates and in the return pipe is more than zero, and the flow rate in the supply pipe and the pressure in the supply manifold is less than zero, form a signal for the protection system to operate. 2 A leak detection device in station heat pipes for open and closed heat supply systems, comprising a flow meter of a supply network water, a flow sensor of a return network water, a flow sensor of a heating network supply, a pressure sensor of a network water supply, a logic device and a timer, characterized in that four signal processing channels, the input of each of which is connected to the output of the corresponding sensor, and the output to the corresponding input of the logic device, as well as the counter connected in series to the number of responses of the logical device, the input of which is connected to the first output of the logical device, and the signal generation block of the protection system, wherein each signal processing channel consists of series-connected information input blocks, the first input of which is the input of the signal processing channel, the second input is connected to the first output of the timer, the delay unit, the second input of which is connected to the second output of the timer, the first switch, the memory unit, the second switch and the analysis unit, the output of which is the output of the signal processing channel, the output of the information input unit being connected to the second input of the analysis unit, the output of the analysis unit is connected to the second inputs of the first and second switches, the third inputs of which are connected to the second output of the logic device, and the fourth input of the second switch is connected to the output of the delay unit, while the second output of the logical device is connected to the second input of the quantity counter logical device triggers. v S L H // In the performance part scheme zaatsl / pm.