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Jiangsu Hongqi Automation Equipment Co., Ltd
HQLWQ gas intelligent turbine flowmeter
NegotiableUpdate on 06/06
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Overview
Brief introduction: Gas intelligent turbine flowmeter is a new integrated intelligent flowmeter that adds temperature and pressure automatic tracking compensation and compression factor correction functions on the basis of the original LWQZ series gas turbine flowmeter. It is used in petroleum, chemical, metallurgical, and urban combustion industries
Product Details
Brief introduction:
The gas intelligent turbine flowmeter is a new integrated intelligent flowmeter that adds temperature and pressure automatic tracking compensation and compression factor correction functions on the basis of the original LWQZ series gas turbine flowmeter. It is an ideal instrument for gas measurement and natural gas trade measurement in industries such as petroleum, chemical, metallurgical, and urban gas.
HQ-LWQ gas turbine flowmeter
1、 Overview of HQ-LWQ gas turbine flowmeter
The HQLWQ gas turbine flowmeter adopts advanced microprocessing technology, which has the advantages of strong functionality, high calculation accuracy, and reliable performance. Its main technical indicators have reached the advanced level of similar foreign products. It is an ideal instrument for measuring gas in petroleum, chemical, power, metallurgy, industrial and civilian boilers, as well as for measuring urban natural gas, gas pressure regulating stations, and gas trade. Its working principle is: when gas enters the flowmeter, it is first accelerated by a special rectifier. Under the action of the fluid, the turbine overcomes the resistance torque and friction torque and begins to rotate. When the torque reaches equilibrium, the speed is stable. The speed of the turbine is proportional to the gas flow rate, and the magnetic resistance of the sensor is periodically changed by the magnet on the rotating transmission disk, so that the sensor outputs a pulse signal proportional to the flow rate. The product has the following characteristics:
1. We use precision bearings specifically designed for instruments imported from Germany, which have high accuracy, good stability, and a wide range (20:1). Small diameters can be used without refueling for five years under normal conditions, while large diameters only require occasional refueling, making it easy to use.
2. The carefully designed flow channel structure avoids the flow of air between the bearings and improves the medium adaptability of the turbine flowmeter.
3. The unique reverse thrust structure and sealing structure design ensure the long-term reliable operation of the bearing.
4. Using magneto resistive elements instead of magnetic sensitive coils not only avoids the existence of magnetic attraction, but also improves detection sensitivity, further reduces the starting flow rate, and enhances product stability and reliability.
5. Independent movement design, good interchangeability and easy maintenance.
6. Integrating temperature, pressure, and flow sensors with an intelligent flow integrator, it can automatically track and correct the temperature, pressure, and compression factor of the measured gas, directly measuring the standard volume flow rate and total amount of the gas.
7. The main performance indicators have reached the international advanced level and comply with the ISO9951 standard.
8. Adopting low-power high-tech, it can work with both internal and external power sources, and the internal battery can be used continuously for more than five years.
9. The HQ-LWQ model has powerful functions, with four compensation methods, three pulse signal outputs, three historical data recording methods, and two standard current signal output methods to choose from.
10. By using RS485 interface to form a network communication system, automated management can be easily achieved. The RS485 communication protocol complies with the MODBUS specification.
11. The header can rotate 180 degrees freely, making installation convenient.
2、 Main technical parameters of HQ-LWQ gas turbine flowmeter
2.1 Model specifications and basic parameters
2.2 Measuring medium
Various gases such as natural gas, city gas, alkanes, and industrial inert gases.
2.3 Usage conditions
◆ Environmental temperature: -30 ℃~+60 ℃; ◆ Medium temperature: -20 ℃~+80 ℃;
Atmospheric pressure: 70kPa~106kPa; Relative humidity: 5%~95%.
2.4 Electrical performance indicators
2.4.1 Working power supply and power consumption
a. External power supply:+24VDC ± 15%, suitable for 4mA~20mA output, pulse output, RS485, etc;
b. Internal power supply: 1 set of 3.6V lithium batteries, which can be used continuously for more than five years.
2.4.2 Pulse output mode (LWQ type, choose one of the following three from the set)
a. Pulse signal under working conditions, optically isolated and amplified output, with high-level amplitude ≥ 20V and low-level amplitude ≤ 1V.
b. The frequency signal proportional to the standard idle flow rate is amplified and output through photoelectric isolation, with a high-level amplitude of ≥ 20V and a low-level amplitude of ≤ 1V.
c. Calibration pulse signal (matched with IC card valve controller), high level amplitude ≥ 2.8V, low level amplitude ≤ 0.2V, unit pulse represents volume quantity, adjustable range: 0.01m~10.00m.
2.4.3 RS485 communication (using optoelectronic isolation RS485 communication module), can be directly connected to the upper microcomputer or secondary instrument network, and remotely displays current data and historical records.
2.4.4 4mA~20mA standard current signal (using optoelectronic isolation standard current module); Two wire or three wire system.
2.4.5 Control signal output
a. Upper and lower limit alarm signals (UP, LP): Optoelectronic isolation open collector electrode (OC) output, normal state OC gate cutoff, alarm state OC gate conduction, maximum load current 50mA, working voltage+12VC~+24VDC.
b. Valve closing alarm (BC) and battery undervoltage alarm (BL) output (for IC card controller); Logic gate circuit output, normal output low level, amplitude ≤ 0.2V; alarm output high level, amplitude ≥ 2.8V, load resistance ≥ 100k0.
2.5 Real time data storage function
a. Start stop records: The latest 1200 start stop times and total records.
b. Diary Record: Record the date, temperature, pressure, standard volume flow rate, and total amount of the past 920 days at midnight.
c. Timed interval records: 920 records of 8 periods of time, temperature, pressure, standard idle flow rate, and total amount for timed intervals.
2.6 Explosion proof grade: Explosion proof type Exd II BT4. Intrinsically safe Exia II CT4.
2.7 Protection level: IP65
3、 Selection of HQ-LWQ gas turbine flowmeter
3.1 Scope of Application
a. In situations where the flow range is required to be less than 20:1 (see Table 1) and there are high requirements for the initial flow rate.
b. There is no frequent flow fluctuation with short interval time and large flow fluctuation amplitude.
c. It can measure natural gas, city gas, compressed air, nitrogen, etc.
3.2 Determination of specifications
Calculate the flow range under working conditions based on the standard gas supply flow range, medium pressure, and temperature (refer to the selection of swirl vortex)
3.3 Pressure loss of flowmeter
Calculate the maximum pressure loss △ Pmax of the flowmeter at maximum flow rate according to formula (1). The maximum pressure loss of the flowmeter must meet condition (2) to ensure its normal use. When the pressure loss does not meet formula (2), a larger specification should be selected.
a. The pressure loss can be calculated using the following formula
In the formula: P: density of gas at standard state (20 ℃, 101.325KPa);
△ Pomax: The maximum pressure loss at high flow rate when the medium is normal dry air (density of 1.205kg/m) (as shown in Table 1);
Pa; local atmospheric pressure (kPa); Q: Operating flow rate (m2/h);
Qmax: maximum operating flow rate of the instrument (m3/h); Pg: Medium gauge pressure (kPa).
Pn: Standard atmospheric pressure (101.325kPa); Tn: Excellent temperature under standard conditions (293.15K);
Tg: Excellent temperature under medium operating conditions (273.15+t); Where t is the working temperature of the medium (℃);
Zn and Zg are the gas compression coefficients under standard and working conditions, respectively.
b. Pressure loss should meet the conditions
P1-△Pmax≥Lmin...................（2）
In the formula: P1: the lowest working pressure of the medium at maximum flow rate;
△ Pmax: The maximum pressure loss of the flowmeter at maximum flow rate during operation;
PLmin: Use the lowest inlet pressure required for gas tools.
4、 External dimensions of HQ-LWQ gas turbine flowmeter
4.1 Flow Meter Dimensions Table
5、 Installation and precautions of HQ-LWQ gas turbine flowmeter
a. For the convenience of maintenance and without affecting the normal transportation of fluids, it is recommended to set up a bypass pipeline as shown in the following figure.
b. To prevent impurities from entering the flowmeter, a filter must be installed. The filter should be installed at a distance of ≥ 2DN upstream of the flowmeter, and our company can provide matching filters.
c. Before installing the flowmeter, the debris, welding slag, dust, etc. inside the pipeline should be cleaned up.
d. The flowmeter has a specialized rectifier with superior performance, so the requirements for the straight pipe section are relatively low. However, it must be ensured that the front straight pipe section is ≥ 2DN and the rear straight pipe section is ≥ 1DN. (Installation methods such as bent pipes, reducers, and pressure regulating valves are suitable for the front straight pipe section.)
e. Install the flowmeter horizontally and ensure that the airflow direction matches the directional markings on the flowmeter housing. (When vertical installation is required, it should be registered at the time of ordering, and the product needs to be configured accordingly. When installing and using, the airflow direction should be from top to bottom.)
f. When installing the flowmeter horizontally, it is recommended to install a steel expansion joint (compensator) after the straight pipe section behind the flowmeter. The expansion joint must meet the requirements of the nominal diameter and nominal pressure of the pipeline design. (Expansion joint is used as a compensation for pipeline stress and to facilitate the installation and disassembly of flow meters)
g. When installing the flowmeter outdoors, it is recommended to add a protective cover to prevent rainwater from entering and strong sunlight from affecting the service life of the flowmeter.
h. There should be no strong external magnetic field interference around the application of the flowmeter. The flowmeter must be reliably grounded, but it must not be shared with the grounding wire of the strong electrical system.
6、 HQ-LWQ gas turbine flowmeter ordering instructions
6.1 When ordering this product, users should choose the appropriate specifications based on the nominal diameter, nominal pressure, flow range, medium temperature range, and environmental conditions of the pipeline.
6.2 Flow meters are generally of the basic type with pulse output for operating conditions. If other accessories and output functions are required, please specify them when placing an order.
6.3 When placing an order, please fill in the following format in detail and correctly.
HQ-LWQ Gas Turbine Flow Meter Selection Table
