(a) Interpretation: The flowchart for the process needs to be drawn. The composition of the gas existing the furnace, the heat Q ˙ ( kJ/h ) and the rate of steam produced in the boiler needs to be determined. Concept introduction: From the block diagram of the process, we can elaborate composition of each molecule in gas. Steam generation rate can be calculated by energy balance on boiler and rate of heat generation can be found by total energy balance.

Question

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Answer 1

Question

Chapter 9, Problem 9.71P

Interpretation Introduction

(a)

Interpretation:

The flowchart for the process needs to be drawn. The composition of the gas existing the furnace, the heat Q˙(kJ/h) and the rate of steam produced in the boiler needs to be determined.

Concept introduction:

From the block diagram of the process, we can elaborate composition of each molecule in gas. Steam generation rate can be calculated by energy balance on boiler and rate of heat generation can be found by total energy balance.

Interpretation Introduction

(b)

Interpretation:

The temperature of the entered air in the furnace and the rate of production of steam (kg/h) needs to be determined.

Concept introduction:

In this part, first we have to calculate total enthalpy balance or steam generation rate. Then energy balance on air preheater.By comparing both the quantites we can calculate the temperature of the air entering into the furnace.

Interpretation Introduction

(c)

Interpretation:

Write the significance of air preheahing and reason for using combustion gases as heating media in boiler.

Concept introduction:

In this question we have to describe about working of air preheater and its effect on overall system performance.Air preheater eliminates heat loss of exhaust gases and increases efficiency.

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1. Liquid heptane is stored in a 100,000-L storage vessel that is vented directly to air. The heptane is stored at 25°C and 1 atm pressure. The liquid is drained from the storage vessel and all that remains in the vessel is the air saturated with heptane vapor. a. Is the vapor in the storage vessel flammable? b. What is the TNT equivalent for the vapor remaining in the vessel? c. If the vapor explodes, what is the overpressure 50 m from the vessel? d. What damage can be expected at 50 m?

2. You have decided to use a vacuum purging technique to purge oxygen from a reactor vessel to reduce the concentration to 2.0% (mol). The reactor is 18 ft diameter and 40 ft tall. The temperature is 80°F. Assume that the vacuum purge goes from atmospheric pressure to 10.0 psia. How many purge cycles are required and how many total moles of nitrogen must be used? Assume the purge is done with pure nitrogen. 3. If the purging described in problem 2 takes place using nitrogen that has 1% (mol) oxygen in it, how many vacuum purge cycles are required? How many total moles of the inert gas must be used? 4. If the purging described in problem 2 is done by way of a "sweep-through" purge instead of a vacuum purge, for how long (in minutes) must the inert gas flow through the vessel if there is a 20 psig supply of pure nitrogen available at 150 CFM (ft³/min)? How much nitrogen must be used (lbm)?

5. Look at Figure 7-14. Determine the voltage developed between the steel nozzle and the grounded vessel, and how much energy is stored in the nozzle. Explain the potential hazards for cases A and B from the following table: Case A Case B Hose length (ft) 75 75 Hose diameter (in) 2.0 2.0 Flow rate (gpm) 30 30 Liquid conductivity (mho/cm) 2x10-8 1x10-14 Dielectric constant 2.3 25 Density (g/cm³) 0.8 0.9 6. In Problem 5, case B, what would be the most effective way to reduce the potential hazards in this situation?

Answer 2

Question

Chapter 9, Problem 9.71P

Interpretation Introduction

(a)

Interpretation:

The flowchart for the process needs to be drawn. The composition of the gas existing the furnace, the heat Q˙(kJ/h) and the rate of steam produced in the boiler needs to be determined.

Concept introduction:

From the block diagram of the process, we can elaborate composition of each molecule in gas. Steam generation rate can be calculated by energy balance on boiler and rate of heat generation can be found by total energy balance.

Interpretation Introduction

(b)

Interpretation:

The temperature of the entered air in the furnace and the rate of production of steam (kg/h) needs to be determined.

Concept introduction:

In this part, first we have to calculate total enthalpy balance or steam generation rate. Then energy balance on air preheater.By comparing both the quantites we can calculate the temperature of the air entering into the furnace.

Interpretation Introduction

(c)

Interpretation:

Write the significance of air preheahing and reason for using combustion gases as heating media in boiler.

Concept introduction:

In this question we have to describe about working of air preheater and its effect on overall system performance.Air preheater eliminates heat loss of exhaust gases and increases efficiency.

Expert Solution & Answer

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Check out a sample textbook solution

See solution

Answer 3

Question

Chapter 9, Problem 9.71P

Interpretation Introduction

(a)

Interpretation:

The flowchart for the process needs to be drawn. The composition of the gas existing the furnace, the heat Q˙(kJ/h) and the rate of steam produced in the boiler needs to be determined.

Concept introduction:

From the block diagram of the process, we can elaborate composition of each molecule in gas. Steam generation rate can be calculated by energy balance on boiler and rate of heat generation can be found by total energy balance.

Interpretation Introduction

(b)

Interpretation:

The temperature of the entered air in the furnace and the rate of production of steam (kg/h) needs to be determined.

Concept introduction:

In this part, first we have to calculate total enthalpy balance or steam generation rate. Then energy balance on air preheater.By comparing both the quantites we can calculate the temperature of the air entering into the furnace.

Interpretation Introduction

(c)

Interpretation:

Write the significance of air preheahing and reason for using combustion gases as heating media in boiler.

Concept introduction:

In this question we have to describe about working of air preheater and its effect on overall system performance.Air preheater eliminates heat loss of exhaust gases and increases efficiency.

Expert Solution & Answer

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Check out a sample textbook solution

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Answer 4

Question

Chapter 9, Problem 9.71P

Interpretation Introduction

(a)

Interpretation:

The flowchart for the process needs to be drawn. The composition of the gas existing the furnace, the heat Q˙(kJ/h) and the rate of steam produced in the boiler needs to be determined.

Concept introduction:

From the block diagram of the process, we can elaborate composition of each molecule in gas. Steam generation rate can be calculated by energy balance on boiler and rate of heat generation can be found by total energy balance.

Interpretation Introduction

(b)

Interpretation:

The temperature of the entered air in the furnace and the rate of production of steam (kg/h) needs to be determined.

Concept introduction:

In this part, first we have to calculate total enthalpy balance or steam generation rate. Then energy balance on air preheater.By comparing both the quantites we can calculate the temperature of the air entering into the furnace.

Interpretation Introduction

(c)

Interpretation:

Write the significance of air preheahing and reason for using combustion gases as heating media in boiler.

Concept introduction:

In this question we have to describe about working of air preheater and its effect on overall system performance.Air preheater eliminates heat loss of exhaust gases and increases efficiency.

Expert Solution & Answer

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See solution

Answer 5

Chapter 9, Problem 9.71P

Interpretation Introduction

(a)

Interpretation:

The flowchart for the process needs to be drawn. The composition of the gas existing the furnace, the heat Q˙(kJ/h) and the rate of steam produced in the boiler needs to be determined.

Concept introduction:

From the block diagram of the process, we can elaborate composition of each molecule in gas. Steam generation rate can be calculated by energy balance on boiler and rate of heat generation can be found by total energy balance.

Interpretation Introduction

(b)

Interpretation:

The temperature of the entered air in the furnace and the rate of production of steam (kg/h) needs to be determined.

Concept introduction:

In this part, first we have to calculate total enthalpy balance or steam generation rate. Then energy balance on air preheater.By comparing both the quantites we can calculate the temperature of the air entering into the furnace.

Interpretation Introduction

(c)

Interpretation:

Write the significance of air preheahing and reason for using combustion gases as heating media in boiler.

Concept introduction:

In this question we have to describe about working of air preheater and its effect on overall system performance.Air preheater eliminates heat loss of exhaust gases and increases efficiency.

Answer 6

Chapter 9, Problem 9.71P

Interpretation Introduction

(a)

Interpretation:

The flowchart for the process needs to be drawn. The composition of the gas existing the furnace, the heat Q˙(kJ/h) and the rate of steam produced in the boiler needs to be determined.

Concept introduction:

From the block diagram of the process, we can elaborate composition of each molecule in gas. Steam generation rate can be calculated by energy balance on boiler and rate of heat generation can be found by total energy balance.

Answer 7

Chapter 9, Problem 9.71P

Interpretation Introduction

(a)

Interpretation:

The flowchart for the process needs to be drawn. The composition of the gas existing the furnace, the heat Q˙(kJ/h) and the rate of steam produced in the boiler needs to be determined.

Concept introduction:

From the block diagram of the process, we can elaborate composition of each molecule in gas. Steam generation rate can be calculated by energy balance on boiler and rate of heat generation can be found by total energy balance.

Answer 8

Interpretation Introduction

(b)

Interpretation:

The temperature of the entered air in the furnace and the rate of production of steam (kg/h) needs to be determined.

Concept introduction:

In this part, first we have to calculate total enthalpy balance or steam generation rate. Then energy balance on air preheater.By comparing both the quantites we can calculate the temperature of the air entering into the furnace.

Answer 9

Interpretation Introduction

(b)

Interpretation:

The temperature of the entered air in the furnace and the rate of production of steam (kg/h) needs to be determined.

Concept introduction:

In this part, first we have to calculate total enthalpy balance or steam generation rate. Then energy balance on air preheater.By comparing both the quantites we can calculate the temperature of the air entering into the furnace.

Answer 10

Interpretation Introduction

(c)

Interpretation:

Write the significance of air preheahing and reason for using combustion gases as heating media in boiler.

Concept introduction:

In this question we have to describe about working of air preheater and its effect on overall system performance.Air preheater eliminates heat loss of exhaust gases and increases efficiency.

Answer 11

Interpretation Introduction

(c)

Interpretation:

Write the significance of air preheahing and reason for using combustion gases as heating media in boiler.

Concept introduction:

In this question we have to describe about working of air preheater and its effect on overall system performance.Air preheater eliminates heat loss of exhaust gases and increases efficiency.

Answer 12

Expert Solution & Answer

Answer 13

Expert Solution & Answer

Answer 14

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Answer 15

Ch. 9 - The standard heat of the reaction...Ch. 9 - Prob. 9.2P Ch. 9 - Prob. 9.3P Ch. 9 - The standard heat of the reaction...Ch. 9 - Prob. 9.5P Ch. 9 - Prob. 9.6P Ch. 9 - Prob. 9.7P Ch. 9 - Prob. 9.8P Ch. 9 - The standard heat of combustion of gaseous ethane...Ch. 9 - The standard heat of combustion (AH°) of liquid...

Solution Summary: The author explains the flowchart for the process. The composition of the gas existing the furnace, the heat and the rate of steam produced in the boiler needs to be determined.

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Chapter 9 Solutions