Henan Red Star system upgrade dryer

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Overall upgrade of dryer system

dryer It is a necessary equipment in many large-scale processing projects. The use process of dryer is affected by many factors. Raw materials, rainfall, structural design and so on are likely to be the reasons for high consumption and low production of dryer. below Manufacturer of Red Star dryer According to the design and production experience of the dryer over the years and the feedback information from customers, the dryer is comprehensively reformed, including the structure of fluidized bed furnace, drying cylinder, electrostatic precipitator, feeding system, coal feeding system, drying furnace, dryer, dust collector, centralized control, etc.

 dryer

1. Improvement of feeding system

Remove the original feeding belt conveyor, and install a new hia00x10 meter bucket elevator at the head of the dryer. The forklift dumps the materials into the hopper. A locking bar gate is installed at the lower end of the hopper, and a speed regulating belt scale is installed under the bar brake. The materials are fed to the dryer through the belt scale. In this way, the amount of material entering the dryer is very uniform, which is conducive to the control of material drying degree. After the original belt conveyor is removed, the working site is loose and the process layout is more reasonable. The electric control system of all equipment in drying system is centralized in one operating room, and corresponding instruments are equipped, such as ammeter, voltmeter, thermometer, pressure gauge, frequency conversion tachometer, etc., for easy operation and monitoring.

2. Improvement of coal loading system

From the original manual coal loading to mechanized coal loading. According to the technical requirements of the improved drying furnace, the equipment of coal feeding system is increased accordingly. The layout of the process flow is as follows: the coal hopper is filled (the forklift tilts the raw coal into the coal hopper), the rod gate controlling the coal output is installed at the coal hopper discharge place, and the vertical hammer type coal breaker is installed under the coal hopper to crush the raw coal into 5 ~ 8mm particle size, and then it is lifted into the coal storage bunker by the bucket elevator (newly installed), and the rod brake is installed under the coal storage bunker, and the speed regulating belt scale is installed at the lower part of the holding gate, and the iron remover is set on the belt scale, The coal enters the coal pulverizer through the speed regulating belt scale, and the coal pulverizer grinds the coal into 0.02mm pulverized coal and then directly blows it into the drying furnace. The reformed coal feeding system is reasonable, compact, easy to operate and fully automatic.

3. Improvement of blanking pipe

The original blanking pipe is a round cast iron casting and extends into the central part of the drying cylinder. Because of its low melting point, easy oxidation, short service life and high consumption. Now it is transformed into a quadrilateral feeding pipe made of Q235 steel plate, which extends into the rear furnace about 200 mm and tilts at a certain angle, so that the material enters the rear furnace in a state of pouring and fully exchanges with hot gas flow. It has the advantages of easy fabrication, long service cycle and convenient maintenance.

4. Improvement of drying furnace structure

The original manual drying furnace is changed into a pulverized coal drying furnace, that is, the length of the combustion chamber of the original drying furnace is changed from 2.5 m to 3.5 m, the furnace grate is removed, and the furnace doors of 500x500mm are installed on both sides of the furnace to facilitate ash cleaning, and the coal injection pipe is installed in front of the furnace to connect with the coal pulverizer. The transformation is simple, time-saving and cost saving, and increases the thermal efficiency of the dryer.

The structure of combustion chamber of drying furnace before and after transformation is shown in Fig. 1 and Fig. 2.

 Structure diagram of combustion chamber before modification

Figure 1 Structure of combustion chamber before modification

 Structure diagram of combustion chamber after transformation

Fig. 2 structure diagram of combustion chamber after transformation

(1) Transformation of combustion chamber

The combustion chamber of drying furnace is divided into front and rear arches. We changed the former furnace top from low in front and high in back into high in front and low in back, increased the height and slope of ash retaining wall, increased the number of nozzles from 117 to 192, reduced the position of coal chute, made coal combustion fully, increased the speed of hot gas flow into dryer and accelerated heat exchange.

(2) Reconstruction of fire wall

Increase the height of annular fire wall from 50 mm to 200 mm, and make the top of ash retaining wall and the top of ring under the fire wall form an inclined rear furnace bottom, so that the furnace bottom and the lower part of the fire wall form the same inclined plane, and the inclination is generally 35 ~ 45 ° to prevent the flame from directly burning the dryer head and fire protection flange, and the other is to make the materials fall behind and slip into the dryer to speed up the materials Flow rate.

5. Improvement of lifting plate and barrel

(1) Change the structure and installation angle of the lifting plate. The length of each lifting plate in the original dryer is lengthened from 500mm to 800mm, and arc-shaped lifting plate is adopted. It is made of 6mm thick Q235 steel plate, and 14 pieces are evenly distributed in the circumference of the dryer cylinder body, and staggered at a certain angle, so that the materials are evenly dispersed in the cylinder body, and the exchange of filling and hot air flow is realized, which improves the thermal efficiency and improves the output of the dryer.

(2) External insulation of drying cylinder. In order to prevent the heat from losing through the cylinder, a cylinder of + 750x10000 is installed in the center of the dryer cylinder, and the cylinder is wrapped with rock wool for external insulation, with a thickness of 200 mm. After the transformation of the dryer, the original 14 tons were increased to 18 tons.

6. Improve dust removal process

The operation of dust removal system directly affects the output of dryer. First of all, we seal the dust removal pipeline to prevent the loss of wind; secondly, we transform the vibration system of the electrostatic precipitator. Due to its poor working environment, it is easy to be damaged due to its poor working environment. After we changed to mechanical rapping, the problem was completely solved and the rapping was very good.

7. Centralized control

Structural components of dryer Complex, centralized electric control is to centralize the electric control system of all equipment in the drying system into one operating room, which is equipped with corresponding instruments, such as ammeter, voltmeter, thermometer, pressure gauge, frequency conversion tachometer, etc., to facilitate operation and monitoring.

8. Benefit analysis

Through the comprehensive improvement of the dryer, from the power consumption, coal consumption, dust collection, labor and other aspects, can save millions of investment each year, increase economic and social benefits, but also improve the working environment and labor intensity of employees. It can be said that this transformation is a big step forward for the dryer industry.

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