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
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.
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.
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. convectional heat excharger
PN-EN ISO 9001: 2009 PN-EN 18001:2004 PN-EN ISO 14001:2005 Certyfikat Nr PL-JBS-188/1/2011
Przedsiębiorstwo Techniki Cieplnej Sp. z o.o. 44-100 Gliwice ul.Wrocławska 24 www.piecoserwis.com.pl, e-mail:piecos@piecoserwis.com.pl
Characteristics of heat exchangers
Description TYPE OF EXCHANGER
HAZARD CATEGORY ACCORDING TO PED
Radiation of heat echarger Tube
Convectional excharger Tube, external rib
IV
IV
HEATING SURFACE
20,28 m2
11,1 m2
WORKING PRESSURE
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 Name: gas for bed adsorbers regeneration Molar composition: CH4: 2,0 - 4,0 [mol %], N2: 96,0 – 98,0 [mol %] or natural gas composition : 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
• gas burners Burner power: 3 MW Calorific value of gas to burn: 20,4 – 31,5 MJ/Nm3 Burner assembly: vertical from the bottom of the furnace, flame up
• furnace operating parameters (control panel) 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 excharger pipe wall: about 550˚C Gas temperature between the exchargers: 750˚C
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