1.

Fuel

1.1.

Fuel for equipment selection

Natural gas

1.2.

  Fuel lower heating value, mJ/m3 (ckal/m3), at 20°С 

  101,325 kPa. Min.

31.8

(7600)

1.3.

Wobbe number range of values (upper). mJ/.m3 (ckal/m3)

41,2-54.5 (9850-13000)

1.4.

Permissible tolerance of Wobbe number from a rated value, %, max

±5

1.5.

Hydrogen sulphide mass concentration, g/mЗ, max.

0,02

1.6.

Mercaptan sulphur  mass concentration, g/mЗ, max.

0.036

1.7.

Oxygen volume ratio, %,  max

1.0

1.8.

Mass of mechanical impurities in 1 m3, g, max

0.001

1.9.

Natural gas composition: hydrogen content, % vol.

0

   Carbon monoxide content %, vol.

Carbon dioxide content

Methane  content , %, vol

Ethane content, %, vol .

Ethylene content, %, vol

Propane  content, %, vol

Propylene  content, %, vol

iC4 content %  vol.

nС4  content, %, vol

Isobutylene content %, vol.

t- buten -2 content, %, vol.

С- buten-2 content, %, vol.

1,3 – butadiene  content, %, vol.

Buten-1 content-1, %, vol.

 iC5 content, %  vol.

nС5 content, %  vol.

Amount of С5 and С6, %, vol.

0

0

96.8-99.3

0.5-2.2

0

0,1-0,7

0

0-0,1

0-0,1

0

0

0

0

0

0

0

0

2.

  Feed water (chemically demineralized water from TPP)

2.1.

  Temperature of feed water at the inlet of a boiler unit, °С

100±5

2.2.

Composition of feed water for boilers

2.2.1.

Ferrum,  μ/dm3

≤20.0

2.2.2.

Oil products, mg/dm3

≤0,3

2.2.3.

Dissolved oxygen,   μ/dm3

≤30,0

2.2.4.

Hardness,  uEg/dm3

≤1,0

2.2.5.

Silicic acid,  μ/dm3

≤20

2.2.6.

Transparency, cm

≥40

2.2.7.

pH at 25°С

9,1-9,5

2.2.8.

Sodium compounds,  μ/dm3

≤80

2.2.9.

Specific electrical conductivity, mmhos/cm

2

2.2.10.

Dissolved solids concentration

≤10

2.3.

Feed water pressure, MPa

1±0,2

2.4.

Boiler steam specification

2.4.1.

pH at 25°С

6.0-9.0

2.4.2.

Relative  dissolved solids concentration (expressed as NCl),  μ/kg

200

2.4.3.

Free ammonia content

Not allowed

2.4.4.

Sodium content,  μ/l

≤60

2.4.5.

Silicic acid concentration expressed as SiO2, μ/kg

≤50

2.4.6.

Electric conductivity, mmhos /cm

≤1

2.4.7.

Ferrum content, μ/kg

≤50

2.4.8.

Cuprum content, μ/kg

≤10

3.

Steam boiler

3.1.

Application

 Steam output with 3.9 MPa pressure, temperature max. 350 for the needs of the plant

3.2.

Steam boiler type

watertube

3.3.

Number of steam boilers

4

3.4.

Boiler rated output, t/h

25

3.5.

Steam pressure under rated load at the main steam stop valve, MPa

Max. 3,9

3.6.

Superheated steam temperature at the main steam stop valve, °C

Max. 350

3.7.

Efficiency

Min. 94%

3.8.

Output control range

20-100%

3.9.

Boiler automatic blowdown

yes

3.10.

Anticipate sample points

yes

3.11.

Point of utilization of flue gas heat

yes

3.12.

Provide operation under the load of 110%

yes

4.

Burner

yes

4.1.

Gas heater

yes

4.2.

Heating of air coming for burning

yes

4.3.

Cleaning of air used for burning

From mechanical impurities

4.4.

Flue gas recirculation through a burner

Yes

4.5.

Air supply

forced

4.6.

Automatic regulation of capacity by means of gas flow rate regulation depending on steam boiler pressure

yes

4.7.

Fuel-air automatic regulation

yes

4.8.

Automatic ignition

yes

4.9.

Flare stack control system

yes

4.10.

Reducing of high inlet pressure to working pressure

yes

4.11.

Control of maximum and minimum gas pressure

yes

4.12.

Fan frequency regulation

yes

4.13.

Smoke exhauster frequency  regulation

yes

4.14.

Shut-off valves leakage monitoring

yes

4.15.

Regulation by residual oxygen in flue gas

yes

5.

Deaerating plant

5.1.

Type

atmospheric

5.2.

Anticipate a damp condenser

yes

6.

Economizer

yes

7.

PRDS

2 pcs.

7.2.

Parameters at the outlet

- max. allowable

1,5 MPa, 295 °С;

- working

1,1  MPa, 270 °С

7.3.

Maximum flow rate through each PRDS 

50 t/h

7.4.

Anticipate automatic and manual valve control

yes

8.

Metering unit

yes

8.1.

Output of overheated steam from the boiler

yes

8.2.

Output of reduced steam from the plant

yes

8.3.

Feed water supply to the boiler

yes

8.4.

Gas supply to the boiler

yes