Power supply diagram of boiler house electric receivers and its design

Contents

Contents

INTRODUCTION

1. DESCRIPTION AND ANALYSIS OF BASIC INITIAL DATA FOR BOILER HOUSE POWER SUPPLY SYSTEM DESIGN

1) 22 kW feed pump

2) Mains pump 124 kW

3) Condensate pump 14 kW

4) 82 kW GM steam boiler smoke pump

5) 45 kW GM steam boiler fan

6) Bridge crane 5 kW

2. SELECTION OF POWER ELECTRICAL EQUIPMENT ACCORDING TO SPECIFIED INSTALLED POWER OF ELECTRIC RECEIVERS

3. SELECTION OF STARTING AND PROTECTIVE EQUIPMENT OF ELECTRIC RECEIVERS. CALCULATION OF BRANCHES TO ELECTRIC RECEIVERS

4. DEVELOPMENT OF POWER SUPPLY CIRCUIT OF BOILER HOUSE ELECTRIC RECEIVERS AND SELECTION OF ITS DESIGN

5. DETERMINATION OF BOILER ROOM DESIGN ELECTRICAL LOADS

CONCLUSION

LIST OF LITERATURE USED

Introduction

The supply of electricity to industrial, municipal agricultural and other facilities is carried out using power supply systems (SES), which use electrical equipment made at different voltages. In general terms, electrical equipment is a collection of electrical products used to produce, convert, transmit, distribute, store or consume electricity. These are a plurality of specialized devices having different functional purposes, available with a wide range of technical characteristics. In the SES of industrial enterprises, electrical equipment includes electrical machines, transformers, devices, measuring instruments, protection and automation devices, cable products, etc.

The design of electrical installations of any voltage is ultimately always associated with the choice of electrical equipment. Technical and economic indicators, reliability and efficiency of operation of SES production facilities depend on it. Therefore, one of the main issues of optimal design of SES of industrial enterprises is the choice of electrical equipment corresponding to the characteristics of electric networks, parameters and operation modes of electric receivers, operating conditions taking into account the state of the environment.

In this course project, calculation is carried out for electric receivers of the first category. These include installations whose interruption entails danger to life, damage to consumer equipment, violations of workflow technology with subsequent serial marriage, disruption of engineering networks and utilities. Consumers of this group must have two power supply points, independent of each other, mutually redundant.

In general, the purpose of designing the power supply system of an industrial enterprise is to select electrical equipment and develop a design of a technical system that provides electric power to the electric receiver and meets the requirements of reliability.

Characterization and analysis of basic initial data for boiler house power supply system design.

1) 22 kW feed pump

Two feed pumps of heat network are installed with closed hot water supply system.

Designed for pumping clean water, industrial and technical purposes (except marine) with a pH of 6... 9, temperature from 273 to 358K (from 0 to + 85 ° C) and from 273 to 378K (from 0 to 105 ° C), and other liquids similar to water in density, viscosity and chemical activity, containing solid inclusions up to 0.2 mm in size, the volume concentration of which does not exceed 0.1%.

• Pump shaft seal - single, double gland or single end seal.

• Maximum allowable overpressure at pump inlet, for pumps with soft gland, 0.35MPa (3.5 kgf/cm2), with end seal 0.6 MPa (6.0 kgf/cm2).

2) Mains pump 124 kW

Centrifugal horizontal single stage two-way pumps are used as mains pumps, as they have the largest supply for centrifugal pumps. Its value ranges from 200 to 800 m/h. The head generated by the pumps is used to overcome the resistances in the boiler room and in the heat networks and is in the range of 40 to 95 m of water. St.

Mains pumps are designed to supply heating networks with water up to 180 ° C, with a concentration of solid inclusions up to 5 mg/l, up to 0.2 mm in size. The main area of ​ ​ application is heating networks .

Pumped media - hot water, industrial water, clean water

3) 15 kW condensate pump

A condensate pump is a device for the operation of which it is necessary to supply a driving medium, such as steam, compressed air or inert gas. The principle of operation of the condensate pump is based on displacement of the pumped medium by the driving medium.

4) 82 kW GM steam boiler smoke pump

Discharge smoke pumps (DN) - medium or high pressure devices, one-way suction. Designed to suck flue gases from the furnaces of boiler units equipped with ash catching systems, and to draw gases from gas-gas boilers. The maximum allowable temperature of the working medium is + 200 degrees. The equipment is equipped with an impeller with 16 blades bent back. The structure consists of a snail, an impeller, a suction funnel, an installation frame and an axial guide gear. Impeller consists of hub and impeller.

5) 45 kW GM steam boiler fan

The VVN fan (Dutyeva fan with Back bent blades) is a medium or high pressure traction, one-way suction machine, which is designed to supply air to the boilers of steam boilers (with balanced thrust and steam capacity from 1 to 25 t/h) or gas-gas gas heating boilers (heat capacity from 0.5 to 16 Gcal/h). It is possible to use VDP blast fans in technological installations of various branches of the national economy for the movement of clean air, as well as as smoke removal fans on gas-gas boilers with balanced thrust. The working medium temperature shall not exceed + 80С.

6) Bridge crane 5 kW

Bridge crane is the most common type of industrial lifting equipment. In order to actuate the mechanism of bridge cranes, electric motors are installed on them.

Conclusion

During the course work, the principles of calculating the electric loads of the boiler house were studied. The equipment was selected according to the received data and a schematic diagram and its design were developed. The selected equipment is designed for a large load and possible emergency situations, to ensure continuous work, the break of which can entail: danger to people's lives, significant material damage, damage to expensive basic equipment, disorder of a complex technical process, disruption of the functioning of especially important elements of the public utilities.

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