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CHEM ENG REVIEWER (wag kayong ano) > DAY 2- ChE CALCULATIONS > Flashcards

DAY 2- ChE CALCULATIONS Flashcards

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1
Q

Material or energy stream that leaves a downstream process unit and returned to the same process unit or upstream unit

A

Recycle

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2
Q

Material or enery stream bled off from a process to prevent accumulation of inert materials that may buildup in the recycle streams

A

purge

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3
Q

material or energy stream that skips one or more unit of the process and goes directly to a downstream unit

A

Bypass

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4
Q

Type of Reaction where the reactant is consumed by two different reaction pathways to form different products

A

Parallel or competing reactions

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5
Q

Reaction where the reactant forms an intermediate product which reacts further to form another product

A

Series or consecutice reactions

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6
Q

Sequence of chemical reactions between a fuel and an oxidant accompanied by the production of heat (exothermic) and conversion of chemical species

A

combustion

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7
Q

Product gas that leaves a combustion furnace

A

Stack gas or flue gas

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8
Q

Compostion in dry basis

A

Orsat analysis

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9
Q

Used to analyze gas samples for its oxygen, carbononoxide and carbon dioxide content.

A

Orsat gas analyzer

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10
Q

Absorbents used in orsat gas analyzer

A

Potassium hydroxide (for CO2), alkaline solution of pyrogallol or benzene-1,2,3- triol (for O2) and ammoniaflq cuprous chloride (for CO)

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11
Q

mole of exygen necessary for the complete combustion of all the fuel fed to the reactor

A

theoretical oxygen

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12
Q

amount by which the air fed to the reactor exceeds the theo air

A

excess air

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13
Q

Imporanr factor to consider in choosing fuel source

A 
*low cost
moderate ignition temp
low moisture content
clean combustion products
high calorific value
minimal amount or non combustible materials
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14
Q

Total heat liberated from the complete combustion of a certain amount of fuel

A

Calorific/Heating Value

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15
Q

1 BTU= 1055 J

1 kcal= ____CHU

A

2.2

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16
Q

Heat relased when the product is liquid water

A

Gross/higher calorific value

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17
Q

Heat released when the product is water vapor

A

Net/Lower calorific Value

18
Q

Analysis of solid Fuel.

Loss in weight of the dample when heated for 1 hour at 104 C to 110 C

A

Moisture

19
Q

Analysis of solid fuels

Loss in weight of the dried sample when heated for 7 min at 950 C in a covered crucible

A

Volatile combustible Matter

20
Q

Weight of the sample after complete combustion or the sample in air at 725 C

A

Ash

21
Q

Classification of solid fuel that originated from the decay of biomass which is converted to peat by bacterial and chemical action and under the influence of time, pressure and temp

A

Coal

22
Q

highest rank of coal

A

anthracite

23
Q

most abundant and widely used rank of coal which is usually black or dark brown in color

A

bituminous

24
Q

lesser grade of coal with more moisture and less FC than bituminous coal

A

Sub-bituminous coal

25
Q

lowest grade of coal

A

lignite or brown coal

26
Q

non agglomerated and non fusible residue from thermal treatment of coal

A

Coal char

27
Q

solid remains from the carbonization of coal, petroleum residues and other carbonaceous materials

A

coke

28
Q

residue from the destructive distillation of wood usually containing 10-15% moisture

A

charcoal

29
Q

Dulong Equation

A

GCV= 0.338(C) + 1.44(H-O/8)+0.094(S)

NCV= GCV-0.212(H)-0.0245(M)-0.0008(O)

30
Q

Usually obtained in elemental form as contaminant of natural gaa and petroleum industry

A

Free Sulfur or Raw Sulfur

31
Q

Common sulfide minerals

A 
Chalcocite
Galena
Pyrite
Chalcopyrite
Cinnabar
32
Q

occurs in primary evaporite depositional environmenta, as secondary minerals in oxidizing sulfide mineral deposits and as gangue minerals in hydrothermal veins

A

Sulfate minerals

33
Q

Lowest temp at which a fuel will flow when cooled and a rough indication of the lowest temperature at which liquid fuel can be pumped

A

Pour point

34
Q

Minimum temp at which fuel will rapidly catch fire when exposed to an open flame located above the liquid

A

Flash point

35
Q

minimum temp required for the fuel to initiate self sustained combustion in a standard container in atmpsphere air in the absence of a spark or flame

A

Auto-ignition temp

36
Q

Measures the tendency of the fuel to form soot

A

Smoke point

37
Q

Type of gaseous fuel that is found compressed in porous rocks and shale formations and composed of mixture of hydrocarbons like methane, ethane, propane, butane, pentane, hexane and some traces of sulfur and organic nitrogen

A

Natural gas

38
Q

consists of ethane, propane and butane

A

LPG

39
Q

Consists of CO2, H2, about 55% N2 and trace amounts of CO2 obtained by passing small amount of air through a hot bed of coal and peat wood and other biomass

A

Producer gas

40
Q

Consists of CO and H2, with small amounts of N2 generated similar to a producer gas but blown with steam thereby decreasing the N2 content and doubling the heating value

A

Water gas

41
Q

Heat released when the fuel initiallt at 25 C reacts completelt wirh oxygen and the products are returned to 25 C

A

Heating Value

CHEM ENG REVIEWER (wag kayong ano) (13 decks)

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