Aspiration of mill grinding equipment

Contents

TASK

Introduction

1 General information about aspirable machines

1.1 Rassev ZRSh-4M No.

2 Aspiration Network Layout

2.1 Drawing up the network layout table

3 Selection of dust separator to the network

3.1 Selection of cyclone to the network

3.2 Selection of cyclone filter to the network

4 Pre-fitting the fan to the mains

5 Network Route Design

5.1 Design of Runway Transitions

5.2 Tee Design No.

5.3 Tee Design No.

6 Calculation of ventilation network

6.1 Calculation of inlet collector for EC- cyclone

6.2 Calculation of output collector for EC- cyclone

6.3 Calculation of the transition to the fan V.Ts5-35-3.55V1.

6.4 Calculation of the transition from V.Ts5-35-3.55V1 fan.

6.5 Selection of deflector

7 Final selection of fan to mains, calculation of fan drive power and selection of fan drive

8 Requirements for installation and operation of aspiration networks

Conclusion

Literature

Appendix A Table No. 2 - "Calculation of pressure losses for the main main direction of network"

Appendix B

Terms of Reference:

Design aspiration network for mill grinding equipment.

Aspirable equipment:

- Rassev ZRSH4M - No. 2 ;

Scope of work:

Calculation and explanatory note 2030 pages (calculation, operating rules, installation requirements);

Graphic part - 3 sheets of A1A2 format (plans, sections, wiring diagram);

Introduction

The purpose of the course project in the discipline "Ventilation plants and pneumatic transport" is to obtain theoretical and practical skills in the calculation and design of equipment aspiration networks at grain processing enterprises.

The grain processing industry has a special type of ventilation plant called aspiration plants. The process taking place in these plants is called aspiration.

Aspiration is the process of creating a reduced pressure in the working spaces of machines by sucking a certain volume of air from them. The vacuum in the machine localizes the dust, preventing the dusty air from entering the room. Air sucked from the machine carries away a significant amount of dust, as well as excess heat and moisture generated during the processing of grain into flour and cereal.

The most harmful component entering the air at grain processing plants is dust of organic and mineral origin. Since all transport and processing operations of grain storage and processing are accompanied by significant dust release, ventilation plants are called upon to create and maintain sanitary and hygienic standards that meet the requirements of SanPiN in the course of their work.

Depending on how the air flow moves, ventilation is generally divided into natural and artificial (mechanical). Natural ventilation occurs as a result of the difference in temperature and pressure outside and inside the building, that is, it occurs under the influence of gravitational forces, as well as due to the effect of wind force. Mechanical ventilation occurs as a result of the operation of special machines - fans.

The types of ventilation devices should also be distinguished:

- General ventilation, which shall ensure normal sanitary and hygienic conditions in the whole room;

- local ventilation, which creates normal conditions at individual workplaces, preventing the distribution of harm throughout the premises;

- exhaust ventilation, it is necessary to remove contaminated air;

- plenum ventilation, by means of which clean air is forced into the room.

Ventilation plants are a set of special equipment: fans, air ducts, dust separators, etc. This equipment is combined into systems for creating air exchange.

Thanks to ventilation plants, significant improvements in working conditions, increased safety, increased machine productivity, prevention of grain self-heating, reduced humidity, increased service life of bearings in machines and apparatuses.. The total cost of operating aspiration networks is 12... 15% of all the energy costs of the enterprise as a whole.

Designing a Network Route

To properly design a network alignment, you must first do the following:

1) to study the device and principle of operation of aspirated equipment;

2) by process equipment normals find out how many suction points this machine has and the location of aspiration points;

3) according to normals, write the dimensions of aspiration holes (if they are specified).

Conclusion

As part of the course project, the technical design of the ventilation plant was designed and calculated in the form and composition in which it is proposed for production by design organizations. The necessary aspiration equipment was selected, its specification was compiled.

The designed aspiration network meets almost all modern requirements: it is explosion-proof, operationally reliable, environmentally and technologically efficient and complies with the rules of safety and labor protection. And also this installation meets the requirements of sanitary and hygienic efficiency.

The ventilation network has a total length of 23.47 m and pressure loss in the main direction Nmag = 1750Pa.

The network includes the following ventilation equipment:

- centrifugal fan of V.Ts5353,55V1.01 brand with the following operation parameters in network:

- the volume of the air moved with the fan in Qv network =1081.4m3/h ;

- pressure developed by fan Hb = 1980 Pa.

- speed of impeller nfan = 2840 rpm;

- efficiency ηв =0.7;

Pyleotdelitel - UTs650 brand cyclone with a resistance to equal NP / about =1013.7 Pas.

The scope of the graphic part of the course project was:

Detailed drawings of the 4th floor of the plant (plans and sections), where aspiration of equipment is carried out, are depicted by process equipment, as well as the designed ventilation plant;

Planar installation diagram of the designed plant with all shaped parts, equipment and with detailed graphical dimension specification of its components.