CN216410292U

CN216410292U - Unilateral plug-in type ultrasonic flue gas flowmeter

Info

Publication number: CN216410292U
Application number: CN202122797797.0U
Authority: CN
Inventors: 付斌; 徐伟利; 吴娟; 于宽; 郭文秀
Original assignee: Beijing SDL Technology Co Ltd
Current assignee: Beijing SDL Technology Co Ltd
Priority date: 2021-11-16
Filing date: 2021-11-16
Publication date: 2022-04-29
Anticipated expiration: 2031-11-16

Abstract

This patent belongs to on-line monitoring flue gas technical field. The patent provides a bayonet ultrasonic wave flue gas flowmeter of unilateral contains: 2 ultrasonic sensors, a supporting probe rod and a detection probe rod; the 2 ultrasonic sensors are fixed at the front part and the rear part of the detection probe rod; the rear end of the detection probe rod is connected with the front end of the supporting probe rod; the supporting probe rod and the detecting probe rod form an included angle of 135 degrees. The device of this patent is favorable to measuring and keeps higher precision, and the installation is simple easy to maintain and has avoided the error that the installation brought.

Description

Unilateral plug-in type ultrasonic flue gas flowmeter

Technical Field

This patent belongs to on-line monitoring flue gas technical field.

Background

The flow rate of the discharged flue gas is an important index for on-line flue gas monitoring.

The mainstream method for monitoring the smoke discharge flow rate at present is a Pitot tube method and a small amount of ultrasonic smoke flow meters. The Pitot tube method is to use Pitot tube to measure dynamic pressure and static pressure of flue gas to react flue gas flux, the advantage is that with low costs, installation are simple, but this kind of equipment precision is not high, zero calibration is difficult, especially can not realize the problem such as little velocity measurement.

Some common to wear formula ultrasonic wave flue gas flowmeter on the market, this kind of equipment measurement accuracy is high, low wind speed measurement accuracy is still very high, characteristics such as easy to maintain, nevertheless has the installation degree of difficulty big with high costs (need open the perforation of certain contained angle in flue wall both sides, installation angle requires highly), product high price scheduling problem.

Aiming at the problems that the accuracy of a Pitot tube method flowmeter is not high, zero calibration is not easy, particularly small flow velocity measurement cannot be realized, and the like, and the problems of high product cost, high installation difficulty, high installation cost and the like of a through type ultrasonic flue gas flowmeter, the invention aims to realize a flue gas flow velocity measuring device which is high in accuracy, particularly small flow velocity, high in accuracy, lower in product cost, easy to install and low in installation cost.

Disclosure of Invention

In view of this, this patent provides a unilateral plug-in ultrasonic flue gas flowmeter, contains: 2 ultrasonic sensors, a supporting probe rod and a detection probe rod; the 2 ultrasonic sensors are fixed at the front part and the rear part of the detection probe rod; the rear end of the detection probe rod is connected with the front end of the supporting probe rod; the supporting probe rod and the detecting probe rod form an included angle of 135 degrees.

In the specific embodiment of this patent, still include the mounting flange, the mounting flange is fixed in support probe rod rear portion.

In the specific implementation mode of this patent, still include the detection case, the detection case links to each other with supporting probe rod rear end.

In a specific embodiment of this patent, the inspection box further comprises an inspection board, and the inspection board is installed inside the inspection box.

The device of this patent is favorable to measuring, has avoided processes such as to wearing formula ultrasonic wave flue gas flowmeter debugging angle, sound journey, concentricity simultaneously, and the installation is simple and the error of having avoided the installation to bring. This installation is less modified to replace the original pitot tube system. The device of this patent can still keep higher precision at low-speed cigarette speed. The device of the patent adopts a low-sound-path structure, the power requirement of the ultrasonic sensor is reduced, and the cost of the sensor is greatly reduced; by adopting the plug-in probe rod structure, only one mounting hole needs to be formed in the side wall of the flue, complex work such as punching, alignment and the like is avoided, and the installation is simple and easy to maintain.

Drawings

FIG. 1 is a schematic diagram of an ultrasonic flue gas flow meter. Wherein, 1 is the detection case, 2 is the pick-up plate, 3 is mounting flange, 4 are supporting probe rod, 5 are ultrasonic sensor.

FIG. 2 is a schematic diagram of the operation of an ultrasonic flue gas flow meter.

Detailed Description

An ultrasonic sensor: a sensor for converting an ultrasonic signal into another energy signal (usually an electrical signal), which is usually composed of a piezoelectric wafer, can transmit an ultrasonic wave and can also receive an ultrasonic wave.

Ultrasonic time difference method: the speed difference of ultrasonic waves in the forward flow direction and the backward flow direction in the pipeline is utilized, the forward flow propagation time and the backward flow propagation time have time difference on the same propagation distance (sound path), and the time difference is related to the speed of the fluid in the pipeline, so that the flow speed of the fluid can be obtained only by measuring the time difference.

Example 1

As shown in fig. 1, the single-sided insertion type ultrasonic flue gas flowmeter comprises: 2 ultrasonic sensor, support probe rod, detection probe rod, mounting flange, pick-up plate, detection case part constitute.

The supporting probe rod is used for adapting to the working condition of the flue, the length of the probe rod with the thick flue wall is longer by 60cm for example according to the change of the environmental length of different flues, the length of the flue with the thin flue wall is shorter by 30cm for example, and the front end of the supporting probe rod is connected with the detecting probe rod and plays a role in fixing and supporting.

The rear end of the detection probe rod is connected with the front end of the supporting probe rod and used for fixing the ultrasonic sensor. The detection probe rod is used for installing and fixing the ultrasonic sensor and realizing an included angle between the sound path of the ultrasonic sensor and the smoke. The probe rod is made of 316L stainless steel, and has high temperature resistance, corrosion resistance and prolonged service life.

The supporting probe rod and the detecting probe rod form an included angle of 135 degrees, so that the ultrasonic wave propagation direction and the smoke flowing direction form an angle of 45 degrees.

The 2 ultrasonic sensors are fixed on the front part and the rear part of the detection probe rod at a certain distance and respectively used as a reverse flow ultrasonic sensor and a forward flow ultrasonic sensor for alternately sending and receiving ultrasonic signals and converting received echo signals into electric signals.

The mounting flange is fixed at the rear part of the supporting probe rod and is used for connecting and fixing the supporting probe rod and the flue wall, so that the supporting probe rod is firm and stable.

The detection box is fixed at the rear end of the supporting probe rod, a detection plate is arranged in the detection box, and the detection box is used for protecting the detection plate.

The detection board is arranged in the detection box and used for controlling and collecting the receiving and transmitting signals of the ultrasonic sensor, converting the collected signals into flow velocity results and uploading the flow velocity results to the monitoring system.

As shown in fig. 2, the structure of the unilateral insertion type ultrasonic flue gas flowmeter mainly comprises a supporting probe rod, a mounting flange and a detection box, the unilateral insertion type ultrasonic flue gas flowmeter is mounted on the side wall of a flue, only one lateral side of the flue wall needs to be horizontally provided with a hole during mounting, the unilateral insertion type ultrasonic flue gas flowmeter is inserted into the flue, and the mounting flange is used for being fixed on the side wall. The interval of two ultrasonic sensors fixed on the detection probe rod is a fixed distance, and the support probe rod and the detection probe rod form a 135-degree angle, so that the two ultrasonic sensors form a fixed sound path after installation, and form a certain angle included angle with the flow direction of flue gas, thereby being beneficial to measurement, simultaneously avoiding the processes of debugging angles, sound paths, concentricity and the like of a cross-through ultrasonic flue gas flowmeter, and having simple installation and avoiding errors caused by installation. This installation is less modified to replace the original pitot tube system.

The device of this patent can still keep higher precision at low-speed cigarette speed. The device of the patent adopts a low-sound-path structure, the power requirement of the ultrasonic sensor is reduced, and the cost of the sensor is greatly reduced; by adopting the plug-in probe rod structure, only one mounting hole needs to be formed in the side wall of the flue, complex work such as punching, alignment and the like is avoided, and the installation is simple and easy to maintain.

Claims

1. Bayonet ultrasonic wave flue gas flowmeter of unilateral, its characterized in that contains: 2 ultrasonic sensors, a supporting probe rod and a detection probe rod;

the 2 ultrasonic sensors are fixed at the front part and the rear part of the detection probe rod;

the rear end of the detection probe rod is connected with the front end of the supporting probe rod;

the supporting probe rod and the detecting probe rod form an included angle of 135 degrees.

2. The single-sided insertion ultrasonic flue gas flow meter of claim 1, further comprising a mounting flange secured to the rear of the support probe.

3. The single-sided insertion ultrasonic smoke flow meter of claim 1, further comprising a detection box connected to the back end of the support probe.

4. The single sided insertion ultrasonic smoke flow meter of claim 3 further comprising a sensing board, said sensing board mounted inside the sensing box.