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LWGQ Gas Turbine Flowmeter
application：Natural gas nitrogen compressed air medium and low velocity gas
medium：
Various gas measurements
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.
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.
Detailed introduction
Ⅰ. 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;
Ⅱ.Working Principle
When the fluid passes through the flowmeter, it is rectified and accelerated by the action of the guide vane (or rectifier). Since the impeller is at an angle to the fluid flow direction, at this time,the turbine generates a rotational moment. After overcoming the friction torque and the fluid resistance torque, the turbine starts to rotate. In a certain flow range, the angular velocity of the turbine rotation is proportional to the volume flow rate of the fluid. According to the principle of electromagnetic induction, a magnetic sensitive sensor is used to induce a pulse signal proportional to the volume flow of the fluid from the synchronously rotating communicating plate. This signal is sent to the volume corrector and is processed together with signals such as temperature and pressure, and displayed on the LCD screen. Its structure principle is shown in Figure 1.
Ⅲ.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.
Ⅳ.Product Modeling
| Model | Description | ||||||
| LWGQ- | □ | □ | □ | □ | □ | □ | Intelligent gas turbine flow meter (standard condition volume type, with temperature, pressure compensation) |
| LWGZ- | Intelligent gas turbine transmitter (working condition volume type) | ||||||
| Caliber | 25 | DN 25mm(non-standard, long order period) | |||||
| 40 | DN 40mm(non-standard, long order period) | ||||||
| 50 | DN 50mm | ||||||
| 65 | DN 65mm(non-standard, long order period) | ||||||
| 80 | DN 80mm | ||||||
| 100 | DN 100mm | ||||||
| 125 | DN 125mm(non-standard, long order period) | ||||||
| 150 | DN 150mm | ||||||
| 200 | DN 200mm | ||||||
| 250 | DN 250mm(non-standard, long order period) | ||||||
| 300 | DN 300mm | ||||||
| Range | A | Standard range | |||||
| B | Expansion range | ||||||
| C | Expansion range | ||||||
| Accuracy grade | 01 | 1.0 grade | |||||
| 02 | 1.5 grade | ||||||
| Output model | A | Pulse output, IC card pulse output, alarm output | |||||
| B | 4-20mA current, pulse output, IC card output, alarm output | ||||||
| C | 4-20mA current, pulse output, IC card output, alarm output, RS485 communication | ||||||
| Explosion-proof grade | N | Standard type, non explosion-proof | |||||
| E | Explosion-proof type, ExdⅡCT6 | ||||||
The dimensions of the flowmeter are shown in Figure 3 and Figure 4. The dimensions not marked in the figure are listed in Table 3. The flowmeter uses flange connection.
The unmarked dimensions in the figure are listed in
Ⅵ.Installation
◇There must be no strong external magnetic field interference and strong mechanical vibration near the flowmeter. Before installation, the ambient condition shall be checked according to its requirements for normal use.
◇The flowmeter shall not be used in applications where the flow rate is frequently changing and there are strong pulsating flow or pressure pulsation.
◇When the flowmeter is installed outdoors, the upper part shall be covered to prevent the rainwater from entering and the sun exposure to affect the service life of the flowmeter;
◇The helium flowmeter is applicable for horizontal installation, and the fluid flow direction is consistent with the direction indicated on the housing; and the length of the straight pipe section of 5DN and 3DN shall be ensured respectively on the upstream and downstream of the flowmeter;
◇ In order not to affect the normal fluid flow, the bypass pipe can be installed as shown in Figure 5, and the bypass pipe valve must be locked during normal use;
◇At the upstream of the flowmeter (≥5DN), it must install the filter of the corresponding specification(the company can match);
◇ When installing the flowmeter and measuring pipe, is shall consider installing telescopic pipe or bellows, and according to the actual dimension of the flowmeter, properly lay the upstream and downstream pipes to minimize the deformation of the flowmeter caused by pipe stress;
◇ The flowmeter shall be installed coaxially with the pipe and prevent the gasket and grease from entering the pipe cavity;
◇The flowmeter must be reliably grounded as specified, but it must not share the ground wire with the high-power system; when the pipe is installed or repaired, the ground wire of the welding system must not be overlapped with the flowmeter;
◇ In the process of use, the user shall not change the connection mode of the explosion-proof system and arbitrarily change the lead interface. If necessary, it shall be operated in strict accordance with the relevant requirements of GB3836.12;
◇When the flowmeter is in operation,it shall open the valve slowly(opening time is not less than 15s), and the flow rate shall be gradually increased to avoid instantaneous airflow impact and damage the turbine.
South China