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WHICH SYNTHESIS PRESSURE FOR HIGH CAPACITY AMMONIA PLANTS

IP.com Disclosure Number: IPCOM000222013D
Publication Date: 2012-Sep-17

Publishing Venue

The IP.com Prior Art Database

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 55% of the total text.

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(2)

Incremental Fuel Cost $106,000

$212,000

$166,000

$212,000

$174,000

$244,000

Based on BHP equivalent to 8# steam per HP-Hr. using high pressure superheated steam

for turbine drives.

$ 83,000.

$106,000

$ 87,000

$122,000

Incremental

Fuel~ MMBTU/Hr.(I)

Compressor Su~.ary ,£or Alternate Process DesiRns

Based on 2 year simple payout using 20¢ and 40¢ per million BTU gas.

2,700

Alternate #I at 2,200 psia synthesis pressure serves as a basis for comparison..


31.7

2,100

2,700

This pressure level considered on the basis of 2 and 3 stages for the synthesis gas compressor.


24.7


31.7


25.9


36.5

see note (3)

d BH_____~_P

2,200

3,100

Total

BH__P

42,700

45,400

44,800

45,40~

44~900

45~800

Nominal Loop

Pressure, Psia

2,200

3,200 (4)

3,200 (4)

4,500

3,650

4,750

Alternate #I Alternate #i Alternate #I Alternate

#2

Alternate #3

Alternate #4


(1)


(2)


(3)


(4)

Notes :


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Pressure System

3~200 - 5,000 Pslg

Catalyst volume decreases as pressure is raised.

High con-

version per pass reduces re- cycle gas rate.

With increasing pressure

a portion of the product can

be

condensed with water cooling.

High

Low~

High Low ~w

ZAgLE

Ammonia Synthesis Loop Su.~.ary

(Low Pressure Versus High Pressure S~nthesis)

Low Pressure System 2~100 - 3w200 Psi~

Greater, Lower conversion per pass with LP process. ~P operation facilitates temperature control. Longer catalyst llfe because of milder temperatures. Essentially the same for LP and HP processes for a given inert concentration in loop. Reduction about i~ in going from 2~000 to 5~000 psig synthesis pressure. Greater for LP process because of

lower conversion per pass, Relatively high.

Low High High

1. Synthesis Catalyst Volume 2. Ammonia Converter Conditions

3. Synthesis Gas.Makeup Requirements

Recycle Flow

Refrigerant Requirements Compressor Horsepower Synthesis Gas

Makeup

Recycle Gas Refrigeration

~tem

5o


4.


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High Pressure System 3~200 - 5~000 PsI~

(or 4 depending on loop design and available makeup gas pressure).

(possibly 5 if makeup and re- cycle services are combined).

Greatest concentration of horse- power is in makeup gas compression service. High shaft horsepower for this machine increases mechanical problems and may necessitate split machine design.

3

2 6

-2-

Low Pressure System 2~I00 - 3,200 Psi~

Combined with makeup gas. 2 4 More balanced design with LP process.

Essentially the same for LP and HP process. Average variation is in order of 3~ with LP marginally favored. Essentially the same for LP and HP process. Higher for LP process.

Higher for LP process.

2...