Sulphur Recovery Quiz 106x6r

Sulphur Recovery Quiz 1

Which tail gas clean-up process uses a catalyst to reduce sulphur components in the tail gas to hydrogen sulphide? a. MCRC b. SCOT c. Superclaus d. Sulphreen

2

The chemical equation of the Claus reaction that takes place in the waste heat boiler and catalytic converters is: a. 3H2S + O2 → 2SO2 + H2O b. 2H2S + O2 → 2SO2 + 2H2O c. 2H2S + SO2 → 3S + 2H2O d. 2H2S + 2H2O → 2SO2 + O2

3

Which of the following tail gas clean up processes uses direct oxidation of the hydrogen sulphide in the tail gas stream? a. Sulfreen b. SCOT c. Superclaus d. MCRC

4

The main reason why H2S is converted to elemental sulphur in gas processing is to: a. protect the environment. b. make lots of money selling the elemental sulphur. c. produce steam that can be used in the gas processing plant make the plant more efficient. d. ensure a supply of elemental sulphur for industrial use.

5

To oxidize a portion of the hydrogen sulphide in the reaction furnace: a. Oxygen from an oxygen plant is flow controlled into the reaction furnace. b. Air is drawn from the surroundings into the reaction furnace burner through adjustable louvers. c. Air is forced into the reaction furnace burner by an air blower. d. Air is forced into the reaction furnace outlet by an air blower.

6

Which method of reheat can be used to remove condensed sulphur from reactor beds? a. Fuel Gas Fired Indirect Heater b. Gas-to-Gas Exchanger c. Steam Reheater d. Hot-gas by

7

What is the purpose of reheat in a sulphur plant? a. Maintain a high enough temperature for the Claus reaction to take place throughout the plant.

b. Maintain the temperature of the sulphur vapours entering the converters above the sulphur dewpoint. c. Maintain a high enough temperature so the sulphur will not solidify on the converter beds and condensers. d. Ensure there is enough heat in the sulphur vapors so that steam is generated in the sulphur condensers. 8

The thermal stage of a straight through, three converter Claus sulphur plant consists of the: a. third condenser, third converter, forth condenser and incinerator b. air blower, reaction furnace, first condenser, first converter and waste heat boiler/exchanger c. air blower, reaction furnace, first condenser and waste heat boiler/exchanger d. first converter, second condenser, second converter and second condenser

9

Which of the following tail gas clean up processes are classified as sub-dewpoint processes? a. MCRC and SCOT b. MCRC and Sulfreen c. Superclaus and Sulphreen d. SCOT and Superclaus

10

In both the straight through and split flow Claus sulphur plant what H2S:SO2 ratio must be maintained to ensure maximum sulphur recovery? a. 2:1 b. 1:1 c. 1:2 d. 3:1

11

More than half of the total sulphur recovered in a straight through sulphur plant is recovered in the: a. second condenser b. first condenser c. waste heat boiler d. first converter

12

In the petroleum industry the common acid gases found in raw sour gas are: a. H2S and CO2 b. COS and CS2 c. SO2 and CS2 d. H2S and SO2

13

What is the main difference between a split-flow and straight through sulphur plant? a. All of the claus reaction takes place in the converters of the split-flow plant whereas the Claus reaction takes place in the waste heat boiler and converters in the straight through plant.

b. All the acid gas flows through the reaction furnace of the split flow plant whereas two thirds of the acid gas is byed around the reaction furnace in the straight through plant. c. The converters are physically smaller in the split-flow plant compared to the straight through plant. d. The split flow plant doesn’t require an incinerator whereas the straight through plant requires an incinerator. 13

What is the purpose of the catalytic converters in a Claus plant? a. Increase the amount of time to allow the H2S and SO2 to completely react with each other. b. Slow the velocity of the gases containing the H2S and SO2 increasing the efficiency of the Claus chemical reaction. c. Increase the efficiency of the chemical reaction between the H2S and SO2. d. Increase the mixing of the H2S and SO2.

14

What is the minimum reaction furnace temperature required in a Claus sulphur plant? a. 1010°C b. 1000°C c. 1093°C d. 1038°C

15

What is the maximum sulphur recovery that can be achieved with a modified Claus sulphur plant? a. 96% b. 99.5% c. 98% d. 70%

16

What compounds are produced by the other side reactions that take place in the reaction furnace? a. carbon disulphide and sulphur dioxide b. carbonyl sulphide and carbon disulphide c. hydrogen and water d. carbonyl sulphide and hydrogen sulphide

17

What is the catalyst that is contained in the converters of a Claus sulphur plant? a. bauxite or activated alumina b. activated charcoal c. platinum on alumina d. cobalt-molybdenum on alumina