Anti blocking type array type air flow measuring device

Productoverview:

ZW-FDS series Anti blocking type array type air flow measuring device The gas flow in the pipeline, the ideal state is a straight section of pipe wall is smooth and has long, otherwise the gas flow in the pipeline is not uniform, there are turbulence and swirl, affect the measurement accuracy. But the wind power plant boiler flue is almost impossible to have such ideal conditions, the solution is to use the grid method of arranging a plurality of measuring points in the air duct, obtained the average wind velocity in the duct.

Two, work principle:

ZW-FDS series of anti blocking type array type air flow measurement device is based on the S type pitot tube measurement principle, according to ISO3966:1997 "measurement of fluid flow in closed conduits using Pitot tube velocity - area methods of" international standards of design and manufacture. Measuring device installed in the pipeline, the probe is inserted into the pipe, when the pipe flow, the windward side by the impact of airflow, converted into kinetic energy in the air pressure here, so the windward side tube of high pressure, the pressure is called "pressure", because the leeward side air flow impact pressure the tube is the static pressure of the wind pipe, the pressure is called "static pressure, total pressure and static pressure difference is called differential pressure, wind speed and the size of the pipe, the greater the wind speed, the greater the pressure; the wind speed is small, the differential pressure is small, the relationship between velocity and pressure accords with the Bernoulli equation:

Type: V - speed unit: m/s;

K flow coefficient measuring device;

The P differential pressure, unit: Pa;

The gas density, unit: kg/m3.

Anti blocking array type air flow measurement device is composed of one or more measuring probes, each probe includes a plurality of gas flow sensor with anti blocking function, each sensor is to measure the throttle and rectifying tube coaxially mounted on the measuring tube rectifier and the corresponding pressure outlet. The whole device for the measurement of air flow is to speed the array. When the air duct is inserted into the multi branch measuring probe, the probe output total pressure and total pressure, static pressure and static pressure in parallel, can the average velocity of each measuring point accurate measurement of air duct section. This means that if as much as possible in the air duct arranged in the measuring probe, each measuring probe as much velocity sensor configuration, you can avoid the air duct due to the influence of flow field, turbulence caused by the asymmetry of the measurement, reduce the measurement error.

Three, application:

ZW-FDS series of anti blocking type array type air flow measuring device is mainly used in two times, two times the total air volume air volume, air jet pulverizer inlet primary air (horizontal duct), a cold wind, the total air volume heat wind air flow measurement occasion.

Three, main features:

1, using a specially designed pressure port, with high pressure performance;

The anti blocking element by measuring the kinetic energy of medium pressure pipeline real-time cleaning 2, specially designed; suitable for containing a large quantity of dust, dirt, medium low Reynolds number condition. Completely solve the blocking problem of signal dust airflow air flow measurement device, air flow measurement device itself has self cleaning anti blocking function using the kinetic energy of fluid, absolutely don't need any additional compressed gas purge gas containing dust, no matter how much concentration, can do long-term maintenance free operation;

3, adopting uniform multi point matrix measurement probe, ensure the accuracy of flow measurement in a short straight pipe, turbulent situation;

4, fluid resistance and sharp edge wear small, high precision measurement;

5, the discharge coefficient of stable, reliable performance;

6, the installation required a very short straight, 0 to 3D upstream, downstream demａnd of 0 to 1D; do not need to install the flow regulator in upstream; shorten the 70% straight section (the first straight section of <3D, after the straight section <1D);

7, pressure effect is good, low loss;

8, specially designed so that the pressure loss is negligible. Inserted type layout for the whole wind road, combined air flow measurement device in wind area is almost negligible, therefore, the loss of the duct fluid pressure almost no energy saving effect is very significant, and has the advantages of convenient installation, flow measurement occasions is particularly suitable for low pressure fluid;

The calibration of 9, cold and hot temperature and pressure compensation technology can effectively improve the measurement accuracy.

Four, technical parameters:

1, pipe size: 100 = D = 9000, mm;

2, nominal pressure: PN = 4Mpa;

3, working temperature: -50 degrees C = t = 8000;

4, range: 1:10, 1:15;

5, precision grade: grade 0.5, grade 1, grade 1.5;

6, the repeatability is better than 0.1%;

7, standard: GB/T2624-2006, JJG640-94 and flow measurement throttling device design manual;

8, connection: flanged, welded, threaded connection.

Seven, the selection of encoding:

Types of marking method:

ZW-FDS- - -PN - C/S/O - -DN II anti blocking air flow measurement device sensor.

ZW - - FDS - basic model; anti blocking air flow measurement device sensor.

II is a two-point arrangement.

DN - - nominal diameter (mm) such as DN1000, nominal diameter 1000 mm.

PN - - nominal pressure (Mpa) such as PN0.1, for the nominal pressure of 0.1 Mpa.

C/S/O pipe material: C steel, S stainless steel, O and other materials.

Eight, design selection and ordering information:

1, the measured medium;

2 commonly used, and the flow rate (m3/h);

3, working pressure (Mpa), temperature (c), Z (Mpa), Z high pressure high temperature (C);

4, medium density and viscosity;

5, pipe material, diameter, diameter;

6, field piping and local resistance piece.

7, you need to display instrument Zhongwei control, please refer to the corresponding instructions, the appropriate choice of models or provided by the technical personnel of our company according to your information for your selection.

8, if there are special to show, please contact our sales department.

Customer service service commitment:

1, our series of flowmeter series product quality problems within 12 months, responsible for free maintenance.

2, the warranty period if the products of our company have any quality problems, our company is responsible for free repair or replacement.

3, the warranty period if the user use undeserved, cause damage to the product, our company is responsible for the maintenance, collect the damaged parts cost.

4, the warranty period after the product quality problems, our company is responsible for the maintenance, collect the damaged parts cost.

5, if the user needs to our service, our company in the province of the user service personnel arrived at the scene within 12 hours, arrived at the scene 48 hours outside users.