阅读说明：本技术 一种燃气用气安全检测方法 (Gas safety detection method for gas ) 是由 何威迪 徐雯 黄华兵 方炯 于 2019-10-17 设计创作，主要内容包括：本发明提供一种燃气用气安全检测方法。本方法建立在超声波计量基础上,超声波计量一般采用时差法对流量进行测量,从而得出表内气体的瞬时流量、累积量和在不同介质中的传播速度。通过对以上得到的数据实时监控,针对特定情况进行进一步分析,获得表具在使用中具体发生的异常事件,分别进行处理,处理完成后针对不同异常事件进行有针对性的异常恢复检测,确保表具的安全使用。本发明介绍针对用户在使用燃气可能发生的各种异常事件来研究的一套解决方案,对各种情况下的异常流量进行有效控制,来确保用户用气的安全。(The invention provides a gas safety detection method for gas. The method is based on ultrasonic measurement, and the ultrasonic measurement generally adopts a time difference method to measure the flow, thereby obtaining the instantaneous flow, the cumulant and the propagation velocity of the gas in a meter in different media. The data obtained by the method are monitored in real time, further analysis is carried out aiming at specific conditions, abnormal events which specifically occur when the meter is in use are obtained and are respectively processed, and after the processing is finished, targeted abnormal recovery detection is carried out aiming at different abnormal events, so that the safe use of the meter is ensured. The invention introduces a set of solution which is researched aiming at various abnormal events which can occur when a user uses gas, and effectively controls abnormal flow under various conditions to ensure the safety of gas consumption of the user.)

1. A gas safety detection method for gas is characterized by comprising the following specific steps:

step (1), acquiring detection data:

measuring the flow by a time difference method to obtain the instantaneous flow, the cumulant and the propagation speed of the gas in the meter in different media;

step (2), judging abnormal data:

when the instantaneous flow is detected to be larger than the high flow threshold value and the duration is detected to be larger than the high flow detection time, the meter is judged to be in a high flow abnormal state; the large flow threshold value is 1.5 times of the meter measuring range Qmax, and the large flow detection time is 2 minutes;

when detecting that the instantaneous flow passing through the meter in the normal use time period of the user is greater than a constant current lower limit threshold value, less than a constant current upper limit threshold value and longer than constant current detection time; judging that the meter is in a constant current abnormal state; the normal use time period is from 5 hours to 22 hours; the lower limit threshold of the constant current of the book is 200L³H, the upper limit threshold of the constant current is 1000L³H; the constant current detection time is 4 hours;

when detecting that the instantaneous flow passing through the meter is smaller than a small flow threshold value and the continuous 3-day duration is greater than the small flow detection time in the time period when the user does not use the fuel gas frequently, judging that the meter is in a small flow abnormal state; the time period of the user not using the fuel gas is 23 hours to 4 hours; the small flow threshold is 20L³The time for detecting the small flow is 4 hours;

when the flow is detected to be reverse and the flow speed is greater than the reverse detection threshold value and lasts for 120s, determining that the air is blown reversely; the reverse detection threshold is-200L³/h；

When the ultrasonic wave propagation speed is detected to be smaller than the upper limit threshold of the air propagation speed and lasts for 10 seconds, that is, the gas in the meter is switched into air, the meter is judged to be disassembled; the upper threshold value of the air propagation speed is 380 m/s;

and (3) processing the abnormal condition:

when the abnormal condition of the meter is detected, the meter generates an alarm signal, closes a valve, records the type of the abnormal condition and informs a worker, the worker finds out the reason, eliminates the fault and opens the valve, and after the valve is opened, abnormal recovery detection is carried out;

and (3) abnormal recovery detection of a large flow abnormal state: after the meter has a large flow abnormal condition, when the instant flow is detected to be smaller than a large flow threshold value and lasts for 10s, judging that the flow is abnormally recovered;

and (3) abnormal recovery detection of a constant current abnormal state: after the meter has a constant flow abnormal condition, when the instantaneous flow is detected to be smaller than a constant flow lower limit threshold value or larger than a constant flow upper limit threshold value and lasts for 10s, judging that the flow is abnormally recovered;

and (3) abnormal recovery detection of a small flow abnormal state: when the meter has a small flow abnormal condition and a worker opens the valve, detecting that the duration of the small flow of the meter in the gas-unusual use time period of the user on the same day is less than 1 hour, judging that the flow is abnormally recovered, and judging that the period is 24 hours;

and (3) reverse air leakage abnormity recovery detection: after the meter has the condition of reverse air leakage, when the air leakage direction is detected to recover to the forward direction and the flow rate is greater than the reverse recovery threshold value and lasts for 10s, judging that the reverse recovery is carried out;

and (3) abnormal recovery detection of the disassembled table condition: and after the table is disassembled, when the ultrasonic wave propagation speed is detected to be greater than the lower limit threshold value of the natural gas propagation speed for 10 seconds, judging that the state of the table is recovered, wherein the lower limit threshold value of the natural gas propagation speed is 400 m/s.

Technical Field

The invention relates to a solution for carrying out real-time anomaly detection on gas use conditions, which is used for ensuring daily and safe gas use of a user.

Background

With the development of city construction, fuel gas is widely applied to daily production and life of cities as a clean energy source. However, the gas is flammable, explosive and toxic, and accidents caused by the gas are characterized by being sudden, unpredictable, large in influence range and serious in consequences, so that the importance of safety detection of gas utilization is warned all the time.

The invention discloses a gas accident statistical analysis method for a gas stove, which is characterized in that the causes of accident discovery mainly comprise ① gas leakage caused by serious aging corrosion and illegal installation of gas pipeline equipment, ② gas leakage caused by pipeline leakage due to the fact that a switching rubber pipe is too short and a pipeline joint is not screwed down, ③ gas leakage caused by the fact that a user leaves a kitchen and forgets to close the kitchen for a long time and the stove is abnormally used for a long time, and the like.

Disclosure of Invention

The invention aims to overcome the defects of the conventional gas safety detection method. The method is based on ultrasonic measurement, and the ultrasonic measurement generally adopts a time difference method to measure the flow, thereby obtaining the instantaneous flow, the cumulant and the propagation velocity of the gas in a meter in different media. And further analyzing abnormal events which may be generated by the meter in use through the obtained data, and respectively processing the abnormal events.

A gas safety detection method for gas comprises the following steps:

step (1), acquiring detection data:

the flow is measured by a time difference method, and the instantaneous flow, the cumulant and the propagation speed of the gas in different media are obtained.

Step (2), judging abnormal data:

and when the instantaneous flow is detected to be larger than the large flow threshold value and the duration is detected to be larger than the large flow detection time, judging that the meter is in a large flow abnormal state. The large flow threshold is 1.5 times of the meter measuring range Qmax, and the large flow detection time is 2 minutes.

When detecting that the instantaneous flow passing through the meter in the normal use time period of the user is larger than the constant current lower limit threshold value, smaller than the constant current upper limit threshold value and longer than the constant current detection time. Then the meter is judged to be in a constant current abnormal state. The normal use time period is from 5 hours to 22 hours; the lower limit threshold of the constant current of the book is 200L³H, the upper limit threshold of the constant current is 1000L³H; the constant current detection time is 4 hours.

When the fact that the instantaneous flow passing through the meter in the time period when the user does not use the fuel gas is smaller than the small flow threshold value and the continuous 3-day duration is larger than the small flow detection time is detected, the meter is judged to be in the small flow abnormal state. The time period of the user not using the fuel gas is 23 hours to 4 hours; the small flow threshold is 20L³And h, the small flow detection time is 4 hours.

And when the flow is detected to be in the reverse direction and the flow speed is greater than the reverse detection threshold value and lasts for 120s, determining that the air is blown reversely. The reverse detection threshold is-200L³/h。

And when the ultrasonic wave propagation speed is detected to be less than the upper limit threshold value of the air propagation speed and lasts for 10s, that is, the gas in the meter is switched to air, the meter is judged to be detached. The upper threshold value of the air propagation speed is 380 m/s.

And (3) processing the abnormal condition:

when the abnormal condition of the meter is detected, the meter generates an alarm signal, closes the valve, records the type of the abnormal condition and informs a worker, the worker finds the reason, eliminates the fault, opens the valve and detects the abnormal recovery after opening the valve.

And (3) abnormal recovery detection of a large flow abnormal state: and after the meter has a large flow abnormal condition, when the fact that the instantaneous flow is smaller than the large flow threshold value and lasts for 10s is detected, judging that the flow is abnormally recovered.

And (3) abnormal recovery detection of a constant current abnormal state: and after the meter has the constant flow abnormal condition, when the instantaneous flow is detected to be smaller than the constant flow lower limit threshold or larger than the constant flow upper limit threshold for 10s, judging that the flow is abnormally recovered.

And (3) abnormal recovery detection of a small flow abnormal state: when the meter has a small flow abnormal condition and a worker opens the valve, detecting that the duration of the small flow of the meter in the gas-unusual use time period of the user on the same day is less than 1 hour, judging that the flow is abnormally recovered, and judging that the period is 24 hours.

And (3) reverse air leakage abnormity recovery detection: and after the meter has the condition of reverse air leakage, judging that the reverse recovery is carried out when the air leakage direction is detected to recover to the forward direction and the flow rate is greater than the reverse recovery threshold value and continues for 10 s.

And (3) abnormal recovery detection of the disassembled table condition: and after the meter is disassembled, when the ultrasonic wave propagation speed is detected to be greater than the natural gas propagation speed lower limit threshold value and lasts for 10s, judging that the meter state is recovered. The lower threshold value of the natural gas propagation speed is 400 m/s.

The invention has the following beneficial effects:

the invention introduces a set of solution which is researched aiming at various abnormal events which can occur when a user uses gas, and effectively controls abnormal flow under various conditions to ensure the safety of gas consumption of the user.

Detailed Description

A gas safety detection method for gas comprises the following steps:

step (1), acquiring detection data:

the flow is measured by a time difference method, and the instantaneous flow, the cumulant and the propagation speed of the gas in different media are obtained.

Step (2), judging abnormal data:

and when the instantaneous flow is detected to be larger than the large flow threshold value and the duration is detected to be larger than the large flow detection time, judging that the meter is in a large flow abnormal state. The large flow threshold is 1.5 times of the meter measuring range Qmax, and the large flow detection time is 2 minutes.

When detecting that the instantaneous flow passing through the meter in the normal use time period of the user is larger than the constant current lower limit threshold value, smaller than the constant current upper limit threshold value and longer than the constant current detection time. The meter is determined to be in a constant current abnormal state. The normal use time period is from 5 hours to 22 hours; the lower limit threshold of the constant current of the book is 200L³H, the upper limit threshold of the constant current is 1000L³H; the constant current detection time is 4 hours.

When the fact that the instantaneous flow passing through the meter in the time period when the user does not use the fuel gas is smaller than the small flow threshold value and the continuous 3-day duration is larger than the small flow detection time is detected, the meter is judged to be in the small flow abnormal state. The time period of the user not using the fuel gas is 23 hours to 4 hours; the small flow threshold is 20L3/h, and the small flow detection time is 4 hours.

And when the flow is detected to be in the reverse direction and the flow speed is greater than the reverse detection threshold value and lasts for 10s, determining that the air is blown reversely. The reverse detection threshold is-200L 3/h.

And when the ultrasonic wave propagation speed is detected to be less than the upper limit threshold value of the air propagation speed and lasts for 10s, that is, the gas in the meter is switched to air, the meter is judged to be detached. The upper threshold value of the air propagation speed is 380 m/s.

And (3) processing the abnormal condition:

when the abnormal condition of the meter is detected, the meter generates an alarm signal, closes the valve, records the type of the abnormal condition and informs a worker, the worker finds the reason, eliminates the fault, opens the valve and detects the abnormal recovery after opening the valve.

And (3) abnormal recovery detection of a large flow abnormal state: and after the meter has a large flow abnormal condition, when the fact that the instantaneous flow is smaller than the large flow threshold value and lasts for 10s is detected, judging that the flow is abnormally recovered.

And (3) abnormal recovery detection of a constant current abnormal state: and after the meter has the constant flow abnormal condition, when the instantaneous flow is detected to be smaller than the constant flow lower limit threshold or larger than the constant flow upper limit threshold for 10s, judging that the flow is abnormally recovered.

And (3) abnormal recovery detection of a small flow abnormal state: when the meter has a small flow abnormal condition and a worker opens the valve, detecting that the duration of the small flow of the meter in the gas-unusual use time period of the user on the same day is less than 1 hour, judging that the flow is abnormally recovered, and judging that the period is 24 hours.

And (3) reverse air leakage abnormity recovery detection: and after the meter has the condition of reverse air leakage, judging that the reverse recovery is carried out when the air leakage direction is detected to recover to the forward direction and the flow rate is greater than the reverse recovery threshold value and continues for 10 s.

And (3) abnormal recovery detection of the disassembled table condition: and after the meter is disassembled, when the ultrasonic wave propagation speed is detected to be greater than the natural gas propagation speed lower limit threshold value and lasts for 10s, judging that the meter state is recovered. The lower threshold value of the natural gas propagation speed is 400 m/s.