PRZEDSIĘBIORSTWO TECHNIKI CIEPLNEJ

Sp z o.o. PL. 44-100 Gliwice, ul. Wrocławska 24, skr. poczt. 125A

www.piecoserwis.com.pl e-mail: piecos@piecoserwis.com.pl tel. (+48 32) 238-26-59, 230-21-37, 230-28-18, fax (+48 32) 231-48-06

PN-EN ISO 9001: 2009 PN-EN 18001:2004

PN-EN ISO 14001:2005

Certyfikat Nr PL-JBS-188/1/2011

PI-6 TUBE FURNACE

Description of the device

The subject of description concerns the tube furnace for heating the regeneration gas used for regeneration of bed adsorbers on two process lines of natural gas denitrification plant. The furnace can replace the old, worn out one taking the total functionality of process.

Furnace construction

Vertical cylindrical furnace equipped with radiation and convection part, mounted on a building on four existing concrete foundation piles (180x180mm)of the spacing of the diagonal of 2550mm.

The radiation part is the vertical cylinder equipped with four support tubes adapted to embed the heat excharger. The conventional heat excharger due to the condition of maximum flow resistance through the furnace (≤ 14kPA), is constructed as a system of 18 parallel streams with low flow velocity of several meters per second.

convectional heat excharger

Przedsiębiorstwo Techniki Cieplnej

Sp. z o.o. 44-100 Gliwice ul.Wrocławska 24

www.piecoserwis.com.pl, e-mail:piecos@piecoserwis.com.pl

2

Characteristics of heat exchangers

Description Radiation of heat echar-

ger

Convectio-nal exchar-

ger TYPE OF EX-CHANGER

Tube

Tube, external rib

HAZARD CATEGORY ACCORDING TO PED

IV

IV

HEATING SUR-FACE

20,28 m2

11,1 m2

WORKING PRES-SURE

0,7 barg

0,7 barg

Furnace operation control The furnace has been equipped with security and control and measurement instrumentation (technological blockings). The AKP instrumentation is localized outside the furnace in order to be available for any operation or maintenance from a fixed platform. Due to the furnace work in hazardous area 2 (methane)an ATEX realization has been adopted. IIB T1 zone. Air curtain is the safety margin against breaching the acceptable operating temperatures by the excharger's walls, it allows, at the same time, to set the suitable pressure in the furnace. The temperature of gas and air mixture measured behind the air curtain should not exceed 850C.

Technical parameters: • medium heat

• gas burners

• furnace operating parameters (control panel)

Name: gas for bed adsorbers regenera-tion Molar composition: CH4: 2,0 - 4,0 [mol %], N2: 96,0 – 98,0 [mol %] or natural gas composi-tion : 68,0 [mol %], nitrogen: 32,0 [mol %] combustible components Flow inlet/outlet 8 000 Nm3/h Supply pressure at the inlet: 70 kPa Gas temperature at the inlet:: 0-30˚C Diameter of the inlet pipe to the furnace: carbon steel Diameter of the inlet connection to the furnace: DN250 carbon steel Maximum pressure drop of gas heated Gas temperature at the outlet: max 320˚C Diameter of the outlet pipe to the

Instantaneous flow rate: 6778 Nm3/h Natural gas stream: 207 Nm3/h Gas temperature between radiation and

convectional exchargers: 102˚C Temperature of the heated gas:: 276˚C Gas temperature in the chimney: 649˚C Temperature at the radiative heat ex-

charger pipe wall: about 550˚C Gas temperature between the excharg-

ers: 750˚C

Burner power: 3 MW Calorific value of gas to burn: 20,4 – 31,5 MJ/Nm 3

Burner assembly: vertical from the bottom of the furnace, flame up