Frequency mixing ultrasonic pipeline descaling structure

Abstract

The invention provides a frequency mixing ultrasonic pipeline descaling structure. The device is composed of three ultrasonic transducers with the frequencies of 25 kHz, 35 kHz and 45 kHz, a corresponding band-pass filter and a notch filter. Through respective descaling in three stages, mixed dirt in the petroleum pipeline can be effectively cleaned in a targeted manner. The band-pass filter and the notch filter can effectively block harmonic interference and other interference signals generated by electromagnetic coupling in a circuit, it is guaranteed that equipment is not interfered during cleaning at all stages, and the descaling effect is guaranteed to the maximum extent.

Description

Technical Field

[0001] The present invention belongs to the field of ultrasonic descaling structures, and particularly relates to ultrasonic transducers and filters. Background Art

[0002] Oil is one of the most important energy sources globally and is widely used in various fields of industry, transportation, and daily life. To meet people's daily needs for oil, it needs to be transported from production sites to various processing plants through pipelines for further serving people's lives. Therefore, the safety, efficiency, and economy of oil pipeline transportation are crucial for ensuring energy supply and maintaining economic development.

[0003] In oil pipeline transportation, pipeline fouling deteriorates the oil transportation conditions, and it is prone to adsorb and accumulate on bends and pipeline walls. During long-term use, scale substances are likely to accumulate inside the pipeline, resulting in a reduction in the effective cross-sectional area of the pipeline, hindering oil transportation in the pipeline, polluting the transported liquid, corroding the pipeline wall, and even threatening people's lives. Therefore, solutions for descaling and anti-scaling of oil pipelines are even more important.

[0004] As a new type of environmentally friendly acoustic application that meets the development needs of domestic and international industries, ultrasonic pipeline descaling and anti-scaling technology uses cavitation effects, shear effects, and inhibition effects to achieve efficient and environmentally friendly descaling and anti-scaling, contributing to oil and gas pipeline networks and national environmental protection.

[0005] However, it has been found during the ultrasonic descaling process that there are various types of oil pipeline fouling. The scale samples collected from the pipeline include various inorganic substances and organic substances mainly composed of oil and asphalt. Among them, inorganic scale is the most typical and is collectively referred to as oilfield scale. The oilfield scale that appears in large quantities in the pipeline can generally be divided into salt scale, corrosion scale, and sediment scale such as sand and mud from a compositional perspective. Among them, it can be classified into hard fouling (such as asphaltene, thick wax, rust), medium-hard fouling (such as wax, colloid, salt, sulfide), and soft fouling (such as loose wax, biofilm, and fine particles). Traditional ultrasonic descaling only removes one type of fouling and does not consider the diversity of fouling types, resulting in incomplete descaling. Therefore, in order to make ultrasonic descaling more thorough, it is necessary to design a new type of mixed-frequency ultrasonic descaling structure according to the characteristics of various types of fouling. Summary of the Invention

[0006] In view of this, the present mixed-frequency ultrasonic descaling structure based on ultrasonic descaling technology provides a solution to the above deficiencies existing in traditional ultrasonic descaling equipment.

[0007] To achieve the above object, the technical solution of the present invention is realized as follows.

[0008] The present invention provides a new structure for removing scale from oil pipelines using multiple ultrasonic frequencies. It consists of ultrasonic transducers with three frequencies of 25 kHz, 35 kHz, and 45 kHz respectively, as well as corresponding band-pass filters and notch filters. Through scale removal in three separate stages, various types of dirt in the oil pipeline can be effectively and specifically cleaned. The band-pass filters and notch filters can effectively block harmonic interference and other interference signals generated by electromagnetic coupling in the circuit, ensuring that the structure is not interfered with during the operation of each stage and maximizing the scale removal effect.

[0009] Furthermore, the 25 kHz ultrasonic transducer is used to specifically clean hard dirt. Hard dirt has the characteristics of high hardness and a dense structure, and strong impact force is required to break it. The cavitation effect of low-frequency ultrasonic waves is more significant compared to other frequencies of ultrasonic waves, and the high-pressure shock waves and microjets generated by it can be used to break hard dirt. The 35 kHz ultrasonic transducer is used to specifically clean medium-hard dirt. Medium-hard dirt is a viscoelastic substance and requires shear force for peeling. For the medium-frequency ultrasonic transducer to maintain the ultrasonic energy density, its amplitude increases, so the vibration speed of the particles increases, the shear force increases, and the shear effect is more significant. The 45 kHz ultrasonic transducer is used to specifically clean soft dirt. The acoustic streaming effect of high-frequency ultrasonic waves is more significant, and through processes such as micro-flow flushing, penetration, and structural destruction, soft dirt can be efficiently cleaned.

[0010] Furthermore, in order to avoid the mutual influence of ultrasonic waves in different operating stages, the corresponding band-pass filters and notch filters for each frequency are innovatively used, which can effectively block harmonic interference and other interference signals generated by electromagnetic coupling in the circuit.

[0011] Furthermore, considering the precipitation sequence and overall distribution of different types of dirt in oil dirt, hard dirt is close to the pipeline, medium-hard dirt is in the middle, and soft dirt is on the top. Scale removal from the oil pipeline is carried out by ultrasonic waves in stages. In the first stage, 25 kHz ultrasonic waves act; in the second stage, 35 kHz ultrasonic waves act; in the third stage, 45 kHz ultrasonic waves act.

[0012] Furthermore, considering that the beam divergence angles of ultrasonic waves with different frequencies are different, and the higher the frequency, the smaller the beam divergence angle. In order to ensure good scale removal effect and full-scale removal of the oil pipeline, different ultrasonic transducer array designs are adopted. In the first stage, the ultrasonic transducer array is designed with four in the circumferential direction; in the second stage, the ultrasonic transducer array is designed with five in the circumferential direction; in the third stage, the ultrasonic transducer array is designed with six in the circumferential direction.

[0013] Compared with the existing traditional technologies, the mixed-frequency ultrasonic scale removal structure described in the present invention has the following advantages.

[0014] Compared with using a single ultrasonic frequency for scale removal, the present invention innovatively establishes the use of multiple ultrasonic frequencies for scale removal, solving the drawback of only being able to monotonously clean one type of dirt in the past. Considering the characteristics of various types of dirt in oil pipelines and the applicable scenarios of ultrasonic waves with different frequencies, low-frequency, medium-frequency, and high-frequency ultrasonic waves are specifically selected to clean hard dirt, medium-hard dirt, and soft dirt respectively, thereby making the ultrasonic scale removal more thorough.

[0015] Compared with ultrasonic scale removal without a filtering device, the present invention proposes the use of band-pass filters and notch filters that match multiple ultrasonic frequencies, which can effectively block harmonic interference and other interference signals generated by electromagnetic coupling in the circuit.

[0016] Compared with ultrasonic scale removal that does not consider the sound beam divergence angle, the present invention proposes a design for the array arrangement of ultrasonic waves with different frequencies, ensuring that the ultrasonic waves cover the entire cross-section of the oil pipeline, and can comprehensively and thoroughly clean the dirt in the oil pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings that form a part of the present invention are provided to further understand the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0018] Figure 1 It is a schematic diagram of the combined structure of an ultrasonic transducer, a band-pass filter, and a notch filter.

[0019] Figure 2 It is a schematic diagram of the array arrangement of 25 kHz ultrasonic transducers.

[0020] Figure 3 It is a schematic diagram of the array arrangement of 35 kHz ultrasonic transducers.

[0021] Figure 4 It is a schematic diagram of the array arrangement of 45 kHz ultrasonic transducers.

[0022] Figure 5 It is a schematic diagram of the structure of mixed-frequency ultrasonic waves.

[0023] The accompanying drawings are sequentially marked as: band-pass filter and notch filter 1, ultrasonic transducer 2, 25 kHz ultrasonic transducer 3, 35 kHz ultrasonic transducer 4, 45 kHz ultrasonic transducer 5, oil pipeline 6.

Claims

1. A mixed frequency ultrasonic descaling structure, comprising an ultrasonic transducer, a bandpass filter, a notch filter, and a high-power adjustable frequency power supply. It is characterized in that: Ultrasonic transducers of three frequencies are used in stages; each ultrasonic transducer is matched with its corresponding bandpass filter; each ultrasonic transducer is matched with its corresponding notch filter; three ultrasonic transducers are integrated in one device; and one frequency-adjustable high-power power supply is used uniformly.

2. According to the mixed-frequency ultrasonic descaling structure described in claim 1, the three frequencies of the ultrasonic transducers are 25kHz, 35kHz, and 45kHz respectively; the maximum ultrasonic output power of the ultrasonic transducer is 100kW, and the ultrasonic duty cycle is 50%.

3. According to the mixed frequency ultrasonic descaling structure described in claim 1, the center frequency of the bandpass filter of the 25kHz ultrasonic transducer is 25kHz, and the bandwidth is ±5kHz; the center frequency of the bandpass filter of the 35kHz ultrasonic transducer is 35kHz, and the bandwidth is ±5kHz; the center frequency of the bandpass filter of the 45kHz ultrasonic transducer is 45kHz, and the bandwidth is ±5kHz.

4. According to the mixed frequency ultrasonic descaling structure described in claim 1, the notch frequency of the notch filter of the 25kHz ultrasonic transducer is 50kHz, and the bandwidth is ±5kHz; the notch frequency of the notch filter of the 35kHz ultrasonic transducer is 70kHz, and the bandwidth is ±5kHz; the notch frequency of the notch filter of the 45kHz ultrasonic transducer is 90kHz, and the bandwidth is ±5kHz.

5. According to the mixed-frequency ultrasonic descaling structure described in claim 1, the three frequencies of ultrasonic transducers are used in stages and have requirements for installation positions; the 25kHz ultrasonic transducer operates in the first stage and is at the front end of the oil pipeline; the 35kHz ultrasonic transducer operates in the second stage and is in the middle section of the oil pipeline; the 45kHz ultrasonic transducer operates in the third stage and is at the rear section of the oil pipeline.

6. According to the mixed frequency ultrasonic descaling structure described in claim 1, the first stage ultrasonic transducer array is designed to be four in the circumferential direction; the second stage ultrasonic transducer array is designed to be five in the circumferential direction; and the third stage ultrasonic transducer array is designed to be six in the circumferential direction.

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