EXCHANGE RATE DESIGN: CALCULATION OF APPARATUS WITH AGITATOR

Contents

Introduction

1. Project Goals and Tasks

2. Sketched Design

2.1.Selection of structural materials

2.2. Determination of design temperature and allowable stresses

2.3. Determination of operating, design, trial and conditional pressures

2.4. Select components. Layout Sketch

2.5. Evaluation of reliability of design version of apparatus layout

3. Technical Project

3.1. Calculation of housing elements

3.1.1. Calculation of shell wall thickness from strength condition

3.1.2. Calculation of shell wall thickness from stability condition

3.1.3. Definition of as-built thickness of shell walls

3.1.4. Calculation of allowable stresses

3.1.5. Calculation of hole reinforcement

3.1.6. Flange connections

3.1.7. Calculation of supports and mounting trunnions of the apparatus

3.2.Compute mechanical agitator components

3.2.1. Stirrer shafts

3.2.2. Calculation of shaft for static strength

3.2.3. Mixers

3.2.4. Key connection of stirrer hub to shaft

3.2.5. Couplings

CONCLUSION

List of sources used

Introduction

Modern technological equipment includes a variety of machines, devices and devices. By the term apparatus in the chemical industry is meant a device in which the technological process is carried out due to physicochemical transformations. Technological processes take place at certain pressure and temperature of treated medium. Devices are usually equipped with various machines, mechanisms and devices, as well as heat exchangers.

When designing process equipment, it is necessary to take into account the following general requirements: economy and reliability. Cost effectiveness is determined by the overall cost of designing, manufacturing, erection, operation and disposal of the equipment after the end of its service life. Reliability is the property of a product to perform a given function while maintaining its performance within a given range for a given service life.

Stirrers are widely used in chemical and many other industries. In devices of this type, many hydromechanical and mass exchange processes are carried out in one- and multiphase media. Substances with various properties, including aggressive, explosive and toxic, are used as the working medium. The sets can be vertical and horizontal. The main elements of the apparatus are a body and a mechanical agitator. By the body of the apparatus is meant a hermetically closed pressure vessel in which mixing is carried out. To supply and remove heat and to maintain the specified temperature of the working medium, the apparatus housing is equipped with heat exchange devices - external ones in the form of a heat exchange jacket. Vertical apparatus housings can be of two types: WEE (vertical, elliptical bottom, elliptical cover); VRE (vertical, conical bottom, elliptical cover). Mechanical mixing devices (LCP) of all devices are structures consisting of a drive, a shaft and a stirrer. The agitator drive consists of an electric motor, a mechanical transmission in the form of a reduction gear or a belt transmission and a drive post. Electric motor converts electric energy into mechanical energy. Reduction gear transmits rotary motion from motor shaft with reduction of rotation speed and increase of torque on output shaft of drive. The drive strut, combining the drive parts into a single unit, serves to attach the LCP elements. The output shaft of the reduction gear is connected to the shaft by means of a coupling (longitudinal-detachable or flange). At the end of the shaft there is a stirrer: three-blade, vane, turbine open or frame.

Chemical devices are subject to periodic inspections and scheduled preventive repairs.

Project Goals and Objectives

The purpose of the project is to develop, in accordance with the initial data, sketched, technical designs and fragments of working design documentation for a typical apparatus with a mechanical mixing device, designed to carry out the mixing process in a liquid-phase system at a given pressure, temperature and properties of the working medium, while maintaining operability in working conditions for a given service life.

The tasks of the project at the technical assignment stage are familiarization with the purpose and device of the apparatus, as well as filling out the technical assignment form. At the sketched design stage, these are the selection of structural materials, determination of design temperature, selection of allowable stresses; determination of working, design, trial and conditional pressures. At this stage, the components are also selected, the layout is sketched and the reliability of the device is evaluated.

At the technical design stage, the elements of the apparatus housing and elements of the mechanical stirring device are calculated, technical documentation is drawn up. The stage of the work design documentation is the design of the assembly unit of the apparatus, the filling of the specification and the design of parts.