Today, I will introduce a national invention authorized patent-ultrasonic gas flowmeter with biogas identification function. The patent was applied for by Wuhan Yineng Kechuang Environmental Technology Co., Ltd., and the authorization was announced on January 18, 2017.
Content descriptionThe utility model relates to the field of gas flow measurement, in particular to an ultrasonic gas flow meter with a biogas identification function.
Background of the inventionAt present, my country is vigorously promoting biogas as a green energy source. At the same time, the state subsidizes the use of biogas. Therefore, there must be an economical method that can measure the composition and flow of biogas at the same time, and can reliably distinguish whether the gas is biogas or air. In this way, it is possible to avoid fraudulent use of biogas subsidies.
In the patent CN103454344, a method for identifying whether the gas passed is biogas or air is proposed. Since the size of the ultrasonic signal is related to the gas pressure, the greater the pressure, the greater the signal. For biogas meters without pressure measuring devices, biogas pressure may appear. When it is larger, the signal is considered to be larger and the measured gas is judged to be air. Therefore, this method is prone to misjudgment due to the influence of gas pressure fluctuations, sensor aging, sensor contamination, etc., and the biogas recognition function of the flowmeter will cause errors.
In the prior art, data such as the flow rate and composition of biogas are measured separately, which is complicated in measurement, low in equipment utilization, and low in measurement accuracy, and it is impossible to accurately identify biogas.
Summary of the inventionBased on this, it is necessary to provide an ultrasonic gas flow meter with biogas recognition function that has diversified functions, can simultaneously perform biogas identification, flow measurement, composition determination, and calorific value determination, and has high measurement accuracy and high recognition accuracy.
The purpose of the utility model can be achieved by the following technical solutions: an ultrasonic gas flow meter with biogas recognition function, including a measuring pipeline for gas to pass through, a first ultrasonic sensor and a second ultrasonic sensor installed in the measuring pipeline for transmitting and receiving ultrasonic waves 2. Ultrasonic sensors, a human-computer interaction system installed on the measuring pipeline, and also include a control system for controlling to calculate gas flow, composition, calorific value and biogas identification; the control system includes a single-chip microcomputer for controlling, A drive module used to drive the first ultrasonic sensor and the second ultrasonic sensor to emit ultrasonic signals, a signal processing module used to process the ultrasonic signals received by the first ultrasonic sensor and the second ultrasonic sensor to obtain electrical signals, and used to measure the propagation of ultrasonic waves Time measurement module, flow calculation module for calculating gas flow, composition calculation module for calculating gas composition, calorific value calculation module for technical biogas calorific value, identification module for biogas identification, the single-chip microcomputer controls The driving module transmits the ultrasonic signal, the signal processing module transmits the electrical signal to the single-chip microcomputer, the time measurement module transmits the time signal to the single-chip microcomputer, and the single-chip microcomputer controls the flow calculation module to calculate the gas flow according to the electrical signal and the time signal. The calculation module calculates the composition according to the gas flow, and the recognition module judges whether the gas is biogas based on the biogas concentration calculated by the composition calculation module. The human-computer interaction system displays the gas flow information, composition information and recognition results.
A further improvement to the above technical solution is that the connection length between the first ultrasonic sensor and the second ultrasonic sensor is L, and the angles between the axis of the first ultrasonic sensor and the axis of the second ultrasonic sensor and the axis of the measuring pipe are both Is θ, and the diameter of the measuring pipe is D. The identification module includes a judging unit and a concentration measuring unit connected to the judging unit for determining the concentration of CH4 in the biogas, and the judging unit judges whether the passed gas is biogas according to the CH4 concentration measured by the concentration measuring unit. The identification module includes a judging unit and a storage unit storing several types of gas usage models. The judging unit compares the gas usage behavior with the gas usage model in the storage unit to determine whether the ventilated gas is biogas. The identification module is an infrared CH4 sensor.
The beneficial effects of the utility model are: in the utility model, under the action of the control system, the first ultrasonic sensor emits ultrasonic signals, the second ultrasonic sensor receives the ultrasonic signals, and the control system converts these ultrasonic signals into electrical signals and calculates the gas Flow rate, composition, calorific value, judge whether the gas is biogas, and then display it in real time through the human-computer interaction system. On the one hand, the utility model can measure the flow rate and composition in real time at the same time for biogas identification, with diversified functions and high equipment utilization. On the other hand, the ultrasonic sensor is used to transmit and receive signals, and the signals are processed for measurement, and the cost is low. The measurement accuracy is high.
The control system includes a single-chip microcomputer for controlling, a driving module for driving the first ultrasonic sensor and the second ultrasonic sensor to emit ultrasonic signals, and an electrical signal for processing the ultrasonic signals received by the first ultrasonic sensor and the second ultrasonic sensor. The signal processing module for measuring the ultrasonic propagation time, the flow calculation module for calculating the gas flow, the composition calculation module for calculating the gas composition, the calorific value calculation module for the calorific value of technical biogas, An identification module for identifying biogas, the single-chip microcomputer controls the drive module to emit ultrasonic signals, the signal processing module transmits the electrical signal to the single-chip microcomputer, the time measurement module transmits the time signal to the single-chip microcomputer, and the single-chip microcomputer transmits the electrical signal and the time signal according to the electrical signal and the time signal. , Control the flow calculation module to calculate the gas flow, the composition calculation module calculates the composition according to the gas flow, the identification module judges whether the gas is biogas based on the biogas concentration calculated by the composition calculation module, and the human-computer interaction system displays the gas flow information, composition information, Calorific value information and recognition results. Under the action of the driving module, when the first ultrasonic sensor transmits ultrasonic waves, the second ultrasonic sensor receives ultrasonic waves, and when the second ultrasonic sensor transmits ultrasonic waves, the first ultrasonic sensor receives ultrasonic waves, and the first ultrasonic sensor and the second ultrasonic sensor will receive ultrasonic signals Transmitted to the signal processing module, after amplification, the ultrasonic signal is converted into an electrical signal, and then fed back to the single-chip microcomputer. At the same time, the time measurement module transmits the time signal to the single-chip microcomputer. The single-chip microcomputer controls the flow calculation module to calculate the gas flow according to the electrical signal and the time signal. The control system has high processing efficiency for the ultrasonic signals received by the first ultrasonic sensor and the second ultrasonic sensor, so that the measured gas parameters have high accuracy, and the use of this control system makes it possible to obtain gas at the same time by using only two ultrasonic sensors. The flow rate and composition reduce the overall measurement cost.
The connecting length of the first ultrasonic sensor and the second ultrasonic sensor is L, the angle between the axis of the first ultrasonic sensor and the axis of the second ultrasonic sensor and the axis of the measuring pipe is θ, and the diameter of the measuring pipe is D.
In addition, the identification module includes a judging unit and a concentration measuring unit connected to the judging unit for determining the concentration of CH4 in the biogas. The judging unit judges whether the gas passed through is biogas according to the CH4 concentration measured by the concentration measuring unit, which is preset, When the CH4 concentration measured by the concentration measuring unit is 50%-70%, the judging unit judges the gas as biogas. When the CH4 concentration measured by the concentration measuring unit is outside the range of 50%-70%, the judging unit uses the gas. It is judged that the air structure is simple and the recognition accuracy is high.
The identification module includes a judging unit and a storage unit storing several types of gas usage models. The judging unit compares the gas usage behavior with the gas usage model in the storage unit to determine whether the ventilated gas is biogas. There are several gas consumption models stored in the storage unit. For example, a gas consumption model is that the user uses gas during cooking. Therefore, it is concentrated in three time periods. The gas consumption behavior in these three time periods will be judged by the unit. It is judged as biogas, and the gas consumption behavior outside these three time periods is judged as air by the judging unit. Another gas consumption model is that due to the large fluctuation range of the gas flow rate during normal gas use, when the gas flow rate is continuously fixed or the gas flow rate changes within several fixed flow values, it is not the normal gas consumption behavior at this time. When the gas consumption behavior is that the gas consumption flow is continuously fixed or the gas consumption flow changes within several fixed flow values, the judgment unit judges it as air, and the rest is judged as biogas. In this embodiment, a software algorithm is used to realize the correct identification of biogas without increasing the hardware cost.
The identification module is an infrared CH4 sensor. The infrared CH4 sensor can directly sense the presence of CH4, and directly distinguish the gas passing through it as CH4 or air, with low cost and accurate identification.
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