Product name: NJGC belt type weighing coal feeder

Summary:

Njgc-30 belt type weighing coal feeder is the main coal feeding equipment for boiler pulverizing system in coal-fired power plants. With continuous feeding of coal, accurate dynamic measurement, high precision, automatic control of sealing wind back channeling, making the system run more safely and reliably. Dynamic measurement error is greater than ± 0.50%.

Equipment composition:

It is mainly composed of closed shell, conveying system, cleaning system, metering system, temperature control and other protection systems, electric gate and electrical control system, and can be expanded according to user requirements.

Working principle:

Tape type weighing coal feeder use tape drive, the raw coal as the raw coal from coal bunker is tape after pulling, under the drive of adhesive tape, on the balance of gravity and the friction between belt to move forward, on the belt material by weighing area, installed in the weighing bridge at the bottom of the two high precision real-time strain sensors detect the instantaneous weight of coal.

A speed sensor mounted on the tail drum provides a series of pulses whose frequency is proportional to the belt speed. The speed signal and weight signal are amplified, shaped, A/D conversion processing and integral operation of the weighing instrument, and the output control signal of the instrument PID is adjusted to the inverter to dynamically adjust the belt speed, so as to ensure the continuous, uniform and quantitative coal feeding of the coal feeder.

Main technical performance:

1. Technical parameters of this series of products

(1) measurement accuracy: ±0.5%(optional ±1.0%)

(2) tape width: 400 ~ 1800mm

(3) conveying capacity: 1 ~ 250t/h

(4) length of conveyor: 1600mm to 15000mm (distance from inlet to outlet center)

(5) speed control range: 0~0.2m/s(stepless speed control with frequency conversion)

(6) temperature control: less than 120℃

(7) state and alarm signals: passive and switching signals

(8) current output: 4-20ma current signal

(9) communication interface: RS232 or RS485C,

2. Main features

◆ fully closed pressure-resistant cylindrical structure, the suburbs to prevent dust overflow, to ensure on-site civilized production;

◆ all shaft outlet points shall be sealed by packing root to meet the equipment pressure requirements;

◆ the coal feeder is of flat roller structure, and the belt is made of ring-shaped flame retardant tape without joint skirt edge, and the skirt edge height is 40mm;

◆ the perfect alarm system can timely find and eliminate the faults of coal blocking, coal breaking, coal crossing, ultra-mild belt running off track, etc.;

◆ the bottom of the coal feeder adopts the chain scraper conveyor to clean the fly ash;

◆ with deviation adjustment and anti-deviation structure to ensure the normal and stable operation of the transmission;

◆ the return trip belt is equipped with gravity type automatic deviation correction device to ensure the belt does not deviate during normal operation;

◆ the main and driven roller supports are supported by pedestal bearings, with lubrication outside the shell;

◆ both ends of the coal feeder are provided with convenient access doors, with observation Windows;

◆ the coal feeder body is equipped with a number of lights, the bulb in the case of no shutdown can be easily replaced;

◆ the optional variable frequency stepless speed regulation runs smoothly, not only saving energy and reducing consumption, but also meeting the requirements of on-site open-loop or closed-loop regulation of different flow rates;

◆ the tail of the speed sensor is installed to reduce the error caused by belt slip and increase the reliability of the speed sensor;

Optional equipment

◆ optional online load zero adjustment function, effectively ensure the accuracy of the coal feeder;

◆ optional tension measuring system, effectively guarantee the weighing accuracy and belt break detection;

◆ optional feed gate gate, manual/electric drive;

◆ optional discharge gate gate valve, the gate type adopts quick closing type, driven by pneumatic or electric;

◆ the feed inlet is designed according to the needs of the site to meet the special requirements of users.