BKZ 220-100 longitudinal boiler unit design

Contents

Introduction

1. Design characteristics of fuel. Selection of slag removal type

Hot Air Temperature and Heating Tail Surface Layout Selection

1.1 Calculation of assigned fuel characteristic

1.2 Selection of slag removal type

1.3 Hot air temperature selection and layout

heating tail surfaces

2. Excess air ratio at the outlet of the furnace and suction

air on separate parts of gas duct

3. Volumes and enthalpy of air and combustion products

3.1 Volumes of theoretical air quantity and

combustion products at excess air ratio

3.2 Actual volumes of combustion products by gas ducts

if excess air ratio is more than one

3.3 Enthalpy of combustion products by gas ducts

3.4 Heat balance, efficiency and

fuel consumption of boiler unit

4. Thermal calculation of the furnace chamber

4.1 Structural and thermal characteristics of the furnace

cameras

4.2 Calculation of heat exchange in the furnace

5. Calculation of radiation superheater

6. Calculation of screen superheater

7. Calculation of convective superheater

8. Calculation of air heater

9. Water economizer calculation

10. Direct Boiler Balance

11. Boiler unit aerodynamic calculation

11.1 Gas Path Calculation

11.1.1 Initial data

11.1.2 Resistance of screen superheater

11.1.3 Resistance of convective superheater

11.1.4 Resistance of water economizer

11.1.5 Calculation of air heater resistance

11.1.6 Calculation of gas duct resistance

11.1.7 Calculation of ash trap resistance

11.1.8 Calculation of stack resistance

11.1.9 Calculation of gravity

11.1.10 Calculation of the full pressure drop along the gas path

11.1.11Selection of smoke pump grade. Definition

its capacity, head and power

drive

Conclusion

List of sources used

Introduction

A steam boiler is the main unit of a thermal power plant (TPP). Working medium in it for steam production is water, and combustion products of various organic fuels serve as heat carrier. The required thermal capacity of the steam boiler is determined by its steam performance while ensuring the established temperature and operating pressure of superheated steam. At the same time, the estimated amount of fuel is burned in the boiler furnace.

The nominal steam capacity is the highest steam capacity that the boiler unit must provide in long-term operation at the nominal parameters of steam and feedwater, with deviations from these values permissible according to GOST.

Rated steam pressure is the highest steam pressure to be provided directly behind the boiler superheater.

Rated temperatures of high pressure steam (fresh steam) and intermediate overheating steam (secondary-superheated steam) - steam temperatures that should be provided directly behind the superheater, with GOST tolerances while maintaining rated steam pressures, feed water temperature and steam performance.

Nominal feed water temperature - the temperature of water before entering the economizer, adopted during the design of the boiler to ensure nominal steam efficiency.

When the boiler load changes, the rated steam temperatures (fresh and secondary-superheated) and, as a rule, the pressure must be maintained (in a given load range), and the remaining parameters will change.

Conclusion

I calculated the BKZ220100 boiler unit according to the given initial data. During this calculation, a number of design solutions were made, the main geometric and thermal characteristics of this boiler were obtained, and a number of boiler auxiliary equipment were selected.

A solid slag removal method was chosen, due to the high temperature of the liquid melting state of the given fuel t3 = > 1500. In this regard, a decision was made on a single-stage design of air heaters for lower air heating at secondary air temperature tg. = 260.

A calculation was made of the economy of the steam boiler, that is, an item was determined. the boiler on the reverse balance, which was approximately 91%, and the fuel consumption per boiler.

The type of fuel and its characteristics also influenced the selection of the drying agent in the dust preparation system. Flue gas drying [%,%] is used for this fuel. The hammer mill MM was chosen as the grinding device, and the dust preparation scheme - with direct injection, with drying of the fuel with flue gases and air.

Boiler furnace chamber of open type, prismatic. The furnace is completely shielded with gas-tight membrane panels made of smooth pipes. It is equipped with six pulverized-angle vortex burners installed opposite to each side wall. The furnace chamber screens are suspended from the ceiling frames of the frame and are freely expandable downwards. Front and rear screens of lower part form cold funnel slabs through which falling slag is continuously removed. Economizer and air heater are arranged in convective shaft along gas flow into section.

The economizer consists of two packages, each 1.45 high.

Air heater along air and gas channels is made two-flow three-way.

For radiation heating surfaces, coolant temperatures and heat loads are determined, and for convective ones, the geometry and layout of the packages, as well as the temperature of the gases behind each package .

As a result of the aerodynamic calculation of the boiler unit, all resistances for the gas and air medium were determined, a smoke pump of the "" brand was selected, which provides the specified discharge in the furnace. From the discharge branch pipe of the smoke pumps through the boron gases enter the chimney with a height of 200, after which they are dispersed in the atmosphere.

БКЗ 220-100 поперечный.cdw

БКЗ 220-100 продольный.cdw