LWGQ Gas Turbine Flowmeter

General

LWGQ gas turbine flowmeter is a new generation of high precision, high reliability gas precision measuring meter integrating temperature, pressure, flow sensor and intelligent flow totalizer developed by the advanced technology of flow meter at home and abroad, optimized by theories of gas mechanics, fluid mechanics and electromagnetics, which has excellent low pressure and high pressure metering performance.

It has a variety of signal output modes and low sensitivity to fluid disturbances, and is widely used in the measurement of natural gas, coal gas, liquefied gas, light hydrocarbon gas.

This type of turbine flowmeter is an explosion-proof product with an explosion-proof rating: ExdIICT6.

Features

• High precision, good repeatability and wide range ratio,up to 1:20 (or wider);

• Use integrated type new rectifier, the requirements for the front and rear straight pipe sections are lower (front ≥ 5DN, rear ≥3DN);

• Use a carefully designed dust-proof structure to ensure the reliability of long-term bearing operation;

• Designed with a unique fueling system to ensure reliable fueling, easy maintenance and beautiful appearance;

• The technical indicators meet the requirements of I509951-1993, the length of the body is 3DN, and the whole machine has reached the international advanced level;

• The volume corrector of the flowmeter can be rotated freely by about 350 degrees, which can be easily read in various installation modes.

• Low speed, high life, low pressure loss, high precision;

• It integrates high-precision temperature, pressure, flow sensor and volume corrector, which can detect the temperature, pressure and flow of the measured gas, and automatically track and compensate the flow and correct the compression coefficient. The meter has real-time database and communicates via RS485 interface and meter reading network to facilitate centralized data collection and real-time management;

• Use high-performance microprocessor and modern digital filtering technology, with powerful software functions and superior performance;

• Use floating point calculation and automatic correction of five-segment meter coefficient, and has fault self-diagnosis and alarm function;

• Use micro-power high-tech, with internal and external power supply, and low power consumption;

• Local display flow value with multiple signal output functions;

• Use a high-contrast three-line LCD display, it can display standard cumulative flow, standard volume flow, working volume flow, medium temperature, pressure value and battery capacity percentage with Chinese prompt;

• With real-time data storage function,  it can prevent data loss when battery is replaced or suddenly power down. In the power-off condition, internal parameters can be permanently saved.

• With explosion-proof function, the explosion-proof mark is ExdIIC6;

Basic Parameters and Technical Parameters

Working Principle

When the fluid passes through the flowmeter, it is rectified and accelerated by the action ofthe guide vane (or rectifier). Since the impeller is at an angle to the fluid flow direction, at thistime,the turbine generates a rotational moment. After overcoming the friction torque and thefluid resistance torque, the turbine starts to rotate. In a certain flow range, the angular velocity ofthe turbine rotation is proportional to the volume flow rate of the fluid. According to theprinciple of electromagnetic induction, a magnetic sensitive sensor is used to induce a pulsesignal proportional to the volume flow of the fluid from the synchronously rotatingcommunicating plate.This signal is sent to the volume corrector and is processed together withsignals such as temperature and pressure, and displayed on the LCD screen. Its structure principleis shown in Figure 1.

Figure 1 Turbine flowmeter structure principle

4.2 Volume Corrector Working Principle

The volume corrector consists of temperature, pressure detection analog channel, flow detection digital channel, micro processing unit, liquid crystal drive circuit and other auxiliary circuits, and it is equipped with an external signal interface.After converting and processing the multi-channel signals sent from each sensor, the signals is brought into the formula for operation according to the gas equation to realize the local display and remote transmission of various signals.

Performance Indicators

5.1 Implemented Standard

(1) Product Implemented standards

a.LWGQ type series gas turbine flowmeter implement JJG1037-2008 “Turbine Flowmeter” verification procedures

b.Implement GB Ding 18940-2003/IS09951: 1993 “Measurement of Gas Flowmeters in Closed Pipes - Turbine Flowmeters” National Standard

c. Implement the national standard of 28848-2012 “Intelligent Gas Flowmeter”National Standard

5.2 Typical Features Curve

The typical features curve of the flowmeter is shown in Figure 1. The Y coordinate represents the basic error of the meter, and the X coordinate represents the percentage of the meter maximum flow.

Product Classification

According to the meter function classification, the LWGQ series gas turbine flowmeter can be divided into two categories: 1. LWGQ type gas turbine flowmeter, 2. LWGZ type gas turbine flowmeter.

1.LWGQ Type Gas Turbine Flowmeter

(1)General

The LWGQ type gas turbine flowmeter integrates a turbine flow sensor and a flow totalizer.

It can measure gas temperature and pressure, working condition flow, standard condition flow and total amount,which can be used for gas flow and volume measurement and detection in industrial industries such as petroleum, chemical, electric power, metallurgy.

(2)Features

It integrates the flow sensor and the volume corrector, which can automatically track and correct the temperature, pressure and compression factor of the measured gas, and directly detect or measure the standard working condition volume flow and total amount of the gas.

Use imported meter precision bearings, high accuracy and good stability.

Well-designed flow channel structure avoids the airflow between the bearings and improves the medium adaptability of the turbine flowmeter.

Unique anti-push structure and sealing structure design ensure reliable long-term operation of bearings.

Use a magnetoresistive sensor, it has the advantages of high sensitivity, good reliability and low starting flow.

Independent movement design, good interchangeability and easy maintenance.

Well-designed rectifiers with excellent rectification performance,  low requirements for straight pipe sections.

The network communication system is formed by RS 485 communication interface, which can facilitate automatic management. The RS485 communication protocol complies with the MODBUS specification.

The correcto can rotate freely at 350 degrees and is easy to install.

2. LWGZ Type Gas Turbine Flowmeter

General

LWGZ type gas turbine flowmeter integrates gas turbine flow sensor and electronic volume corrector. It can detect and display the working condition flow and total volume. The technical performance is at the domestic advanced level,complies with GB/T18940/IS09951 standard, which is widely used in gas metering and testing in industries such as steam and compressed air.