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CS Electronic Weighing Feeder

key word:Heat exchange element

Category:


Product description

CS electronic weighing coal feeder

 

1. Introduction

1.1. Purpose

Electronic weighing coal feeder is a kind of belt type coal feeder with microcomputer control, electronic weighing and automatic speed regulation. It is the main auxiliary equipment of coal pulverizing system of power station boiler. It can automatically and accurately adjust the coal feeding amount according to the requirements of the boiler combustion control system, so as to ensure the good combustion of the boiler. It is mainly used for the coal feeding of the coal pulverizing system of the power plant boiler, and also can be used for the conveying and batching in the fields of metallurgy, chemical industry, cement, etc.

1.2. Model meaning

CS ** 24 – #P

CS -- character code of manufacturer

**----Design number

24 -- specification code

#P --- withstand voltage type (HP for pressure type, LP for non pressure type)

1.3. Structural features

The electronic weighing coal feeder is mainly composed of body, feeding belt mechanism, chain cleaning scraper mechanism, microcomputer control cabinet, weighing mechanism, coal breaking signal device and coal blocking signal device. Its structure is shown in Fig. 17-1.

1.3.1. The engine body is a sealed welded shell, which can withstand 0.35Mpa explosion pressure and meet the requirements of NFPA85F.

1.3.2. The feeding belt mechanism is composed of motor, reducer, belt drive drum, tension drum, belt support plate and feeding belt. The feeding belt has skirt on both sides and V-shaped guide rib in the middle of the inner side. There are corresponding V-shaped grooves in each drum, which makes the belt have good guiding performance in the actual operation process. The tension roller keeps the constant tension of the feeding belt to ensure the stable metering accuracy of the coal feeder.

1.3.3. Chain cleaning scraper mechanism is used to clean coal ash at the bottom of coal feeder. The motor drives the chain with wings through the reducer to scrape the coal ash to the outlet of the coal feeder to discharge. The driving motor adopts electronic over-current relay for overload protection.

1.3.4. The microcomputer control cabinet is installed on the machine body and is designed with control and power integrated cabinet, which has the functions of fault self diagnosis and fault memory

1.3.5. The weighing mechanism is located between the coal feeder inlet and the driving drum, which is composed of two weighing supporting rods, one weighing rod and a pair of weighing sensors. Two weighing idlers fixed on the body constitute the weighing span, and a pair of weighing sensors are hung at both ends of the weighing roller in the middle of the two weighing idlers.

1.3.6. The coal breaking signal device is installed above the feeding belt. When the belt conveyor has no coal, it will send out the coal breaking alarm signal.

1.3.7. The coal blocking signal device is installed at the outlet of the coal feeder. When the coal flow at the outlet of the coal feeder is blocked, the coal blocking alarm signal will be sent out

1.4. Working principle

When the electronic weighing coal feeder works, the raw coal enters the coal feeder from the outlet of the raw coal bunker, and then it is transported by the feeding belt to the coal mill through the outlet of the coal feeder. Its working principle is shown in Fig. 17-2.

Under the feeding belt, two weighing pallets with accurate size are installed to form the weighing measurement span. There is a weighing mixer in the middle of the weighing span, and the two ends of the weighing wheel are respectively suspended under a pair of dust-proof, explosion-proof and high-precision weighing sensors, thus forming the so-called weighing platform.

When the raw coal to be transported passes through the weighing platform, the weighing sensor will generate an electrical signal which is directly proportional to the material mass on the belt between the skin weighing spans. At the same time, the shaft end of the belt drive motor is equipped with a speed sensor to output the belt speed in the form of pulse. These two signals can display instantaneous coal feeding rate and cumulative coal feeding quantity of weighing coal feeder after calculation by microcomputer processing system. The accuracy of coal measurement is ±0.5%.

The microcomputer processing system calculates the coal feeding rate, and compares the coal feeding rate signal with the preset coal feeding rate signal or the coal feeding rate signal required by the boiler combustion control system. According to the comparison results, the speed of the belt driving motor is adjusted, so as to change the speed of the belt, so that the actual coal feeding rate is consistent with the required coal feeding rate, so as to meet the requirements of the boiler combustion system need.

1.5. Product series

According to the diameter of coal feeder inlet, electronic weighing coal feeder has three specifications: CS2018, CS2024 and CS2036.

 

2. Main technical parameters

The main technical parameters of CS electronic weighing coal feeder are shown in table 17-1.

Table 17-1 main technical parameters of CS electronic weighing coal feeder

No. Items Specification parameters
CS2018 CS2024 CS2036
1 output/capacity (t/h) 2~30 10~100 25~250
2 Inlet dimensions (diameter) (mm) 556 609 914
3 Feeding distance (standard one) (mm)  1829 2134 2743
4 Belt driving motor power (kW) 2.2~5.5 3~5.5 4~7.5
5 Weighing accuracy (%) ± 0.5 ± 0.5 ± 0.5
6 Controlling accuracy (%) ± 1.0 ± 1.0 ± 1.0

Note: the coal feeding distance can be designed according to the use requirements.

 

3. Equipment appearance and structural dimensions

3.1. The appearance of CS electronic weighing coal feeder is shown in figure 17-3, and the structural dimensions in the figure are shown in table 17-2.

Table 17-2    Structural dimensions of CS electronic weighing coal feeder   (mm)

Model A B C D E F
CS2018 1829 556 2952 1580 1620 1276
CS2024 2134 609 3360 1700 1620 1372
CS2036 2743 914 4174 2030 1710 1651

Note: the above is the standard size, A,C size can be designed according to the actual coal feeding distance.

3.2. The maintenance space of CS electronic weighing coal feeder is shown in Figure 17-4, and the dimensions in the drawing are shown in table 17-3

Table 17-3

Model A B C D
CS2018 1100 2000 600 220
CS2024 1184 2000 680 100
CS2036 2210 2300 940 100

3.3. The foundation of CS electronic weighing coal feeder is shown in figure 17-5, and the dimensions in the drawing are shown in table 17-4.

Tabel 17-4

Model A B C D E F G H J K L
CS2018 1829 2756 596.7 210 855 850 920 1020 60 30 25
CS2024 2134 3135 596.7 284.3 860 1010 1168 1270 60 30 25
CS2036 2743 4211 832 519 1230 1474 1626 1727 60 34 32

Note: the above is the standard size, A,C size can be designed according to the actual coal feeding distance.

 

4. Selection method

For the unit equipped with medium speed pulverizer, each pulverizer is equipped with one coal feeder, and one set is for standby; for the unit equipped with double inlet and double outlet ball mills, each pulverizer is equipped with two coal feeders, which is generally not used for equipment.

The coal feeder is generally selected according to the required output, and its maximum output shall not be less than 110% of the calculated output of the grinding machine.

 

5. Scope of supply

The standard supply scope of coal feeder is from raw coal bunker outlet to coal mill population. The flow layout of the electronic weighing coal feeder is shown in figure 17-6, and the special tools are shown in table 17-5.

Table 17-5

 

No. Name Quantity Remark
1 Horizontal calibration bar (piece) 1 Special tools for measurement
2 Calibration detector and cable (piece) 2
3 Reflective sheet (piece) 5
4 Calibration weight (piece) 2
5 Roller removal seat (piece) 1 Special tools for maintenance
6 Roller lifting rod (piece) 1
7 Roller extension bar (piece) 1