Design of flue gas desulfurization system

Abstract

Flue gas desulfurization is the only large-scale commercial desulfurization method in the world, and it is the main technical means to control acid rain and sulfur dioxide pollution in thermal power plants. The investment of flue gas desulfurization device will cost a lot of money. Most of the flue gas desulfurization projects in domestic thermal power plants are imported from abroad, and only the domestic installation is responsible. The use of foreign technology and equipment will inevitably make the project cost very expensive. If the technology and equipment are localized, the cost of flue gas desulfurization project can be greatly reduced, thus making it possible to apply flue gas desulfurization devices on a large scale in China.

this design aims at the flue gas content and desulfurization requirements given in the graduation design task book, and combines the technical status of flue gas desulfurization in China to design a relatively complete flue gas desulfurization system. The purpose of this design is to actively prepare for the localization of flue gas desulfurization technology.

The main work of this design is as follows:

The existing flue gas desulfurization technology is introduced and analyzed, and then the wet limestone-gypsum method is determined.

Some main desulfurization devices and types are introduced, and the type and process of absorption tower are determined after comparison and selection.

each subsystem of wet limestone-gypsum flue gas desulfurization process is introduced, and the treatment process, devices and equipment of each subsystem selected in this process are roughly determined.

The pipeline ventilation diagram of the system is designed, including flue, device and chimney. Based on this, the pressure loss, flow rate and temperature drop of the pipeline are calculated step by step, and the desulfurization fan and limestone slurry recirculation pump are selected according to the above data.

The designed flue gas desulfurization process is analyzed in terms of technology and economy.

Finally, the general conclusion is drawn, and the main problems existing in the process and some suggestions are put forward.

Keywords: composition of wet limestone-gypsum flue gas desulfurization system

Abstract

FGD (Fume gas desulfurization) is only cosmically cmmercial desulfuration type in the world. It is dominating technology measure to control acid rain and sulfur dioxide pollution.F GD equipment cost huge fund. Most equipment of FGD project in fire power plants in our nation are imported. We only take charge installation.Overseas technology and equipment are too costly,If it is made in our country,FGD project's cost will be decreased consumedly, accordingly it will become possible to apply FGD equipment cosmically in our nation.

According to the composition of the Fume Gas and the desurfuri zation request,combining with existing FGD technical process in our nation, this article designed a set of adequate FGD systems.The purpose of this artical is that do some prepares for the designing process of the FGD of our ow n country.

This article's main work are:

Analyzed and compared existing FGD technology of domestic and overseas , chose the Limestone-Gypsum Wet Method Desurfurization Technology for Fume Gas.

Introduced main equipment of the desurfurization , then decided the type and the diagram flow of the absorber.

Designed the arrangment of system's popes , including chinmney、relevant equipment and so on.

Calculated the pressure loss, the Fume Gas volume and temperature decrease of these draw popes.

Carried out economic and technical analysis of the FGD system designed by wr iter.

Drawn out the conclusion of the article , pointed out some questions that existed in practical application and given my own advice.

Key words: Limestone-Gypsum Wet Method Desurfurization T Echology composition of the procurement system calculation of the draw popes technical and economic analysis

Contents

Preface of Chapter 1------------. -----------------1

1.1 current situation of flue gas desulfurization technology. Present situation-4

1.2 Introduction of foreign flue gas desulfurization technology. --------------6

1.3.2 Prospect of flue gas desulfurization technology development------7

2nd 1.1 characteristics of various types of flue gas desulfurization technologies-8

2.1.2 factors to be considered when selecting process scheme-9

2. -12

2.1.5 Comparison and selection of oxidation process-13

2.2 Principle of wet limestone-gypsum desulfurization process. -14

2.2.2 SO2 absorption------------15

2.2.3 sulfate formation. 2.5 limestone dissolution-16

2.2.6 Summary----------. Selection-17

2.3.2 Further determination of spray absorption tower process-18

2.3.3 Summary- -21

3.1 limestone slurry preparation system-21

3.2 flue gas reheating system. 24

3.2.2 Exhaust flue gas from cooling tower-24

3.2.3 By-pass flue gas method. --------------26

3.3 SO2 absorption system. -29

3.6 wastewater treatment. System-31

3.8 Summary----------------- -------------33

4.2 Design calculation. Location of reheater and chimney and arrangement of pipes -34

4.2.3 Calculation of pipe section-35

4.3 Fan, Selection of motor and circulating pump-43

4.3.1 Selection and calculation of fan and motor-43

4.3.2 Selection of circulating pump in absorption tower. 5.1 purpose and significance of technical and economic analysis-47

5.2 system technical analysis----- Influence of sulfur device on boiler and flue gas system-48

5.2.3 Floor space of flue gas desulfurization device-49

5.2.4 Process complexity of flue gas desulfurization device.