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Residence Time Calculation

This document provides calculations for furnace residence time for a 2x500 MW steam generator package at NTECL/Vallur TPP project. It includes calculations for furnace volume, mean gas temperature, gas quantity, gas volume, and residence time for design coal, worst coal, and best coal cases. The residence time is calculated to be in the range of 1.75 to 1.90 seconds for different coal cases. The calculations are presented in a table format with headings like 'Load', 'Furnace Volume', 'Mean gas Temperature', 'Gas quantity', 'Gas Volume', and 'Residence Time'.

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anil perala
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883 views3 pages

Residence Time Calculation

This document provides calculations for furnace residence time for a 2x500 MW steam generator package at NTECL/Vallur TPP project. It includes calculations for furnace volume, mean gas temperature, gas quantity, gas volume, and residence time for design coal, worst coal, and best coal cases. The residence time is calculated to be in the range of 1.75 to 1.90 seconds for different coal cases. The calculations are presented in a table format with headings like 'Load', 'Furnace Volume', 'Mean gas Temperature', 'Gas quantity', 'Gas Volume', and 'Residence Time'.

Uploaded by

anil perala
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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CAT-I

Digitally signed by
goutam
DN: cn=goutam, c=IN,
o=NTPC, ou=CC/EOC,
email=gkhalder@ntpce
oc.co.in
Date: 2008.10.15
14:26:48 +05'30'

CERTIFIED TRUE COPY BASED ON APPROVAL


NTPC / SIMHADRI STPP - STAGE-II (2 x 500 MW)
NTPC DRG. No.: 3530-101-01-TR-PVM-U-007 / REV.00

NTPC DRG. No.: 0260-101-01-TR-PVM-U-007


JOB NO: 288 NTPC TAMILNADU ENERGY COMPANY LTD.
STATUS: VALLUR THERMAL POWER PROJECT
DISTRIBUTION 2 x 500 MW
STEAM GENERATOR WITH ESP PACKAGE
TO Dept Name Sign Date
Code
No. of BHARAT HEAVY ELECTRICALS LTD. DRN
REV. Date ALTD CHD APPD UNIT : HIGH PRESSURE BOILER PLANT DESN AVR 26.02.08
TIRUCHIRAPPALLI – 620 014 CHD MA 26.02.08
APPD MA/SCS 26.02.08
TITLE
FURNACE RESIDENCE TIME CALCULATION
DEPT. SCALE DRAWING NO.
SIGN.
DATE. SHEET 1 OF 2 REV 00 A
CAUTION: THIS DRAWING IS THE PROPERTY OF BHARAT HEAVY ELECTRICALS LTD., AND IS NOT TO BE REPRODUCED OR USED TO FURNISH
ANY INFORMATION FOR MAKING OF DRAWINGS OR APPARATUS EXCEPT WHERE PROVIDE FOR AGREEMENT WITH SAID COMPANY.
FURNACE RESIDENCE TIME CALCULATION

Load BMCR

Design
COAL coal
Worst coal Best coal

UNIT

Furnace Volume from top


fuel nozzle to horizontal m3 5598
plane at furnace nose tip

Mean gas Temperature °C 1464 1465 1467

Gas quantity t / hr 2245 2334 2179

Gas Volume m3 / s 3049.5 3191.4 2953.9

Residence Time = Sec 1.84 1.75 1.90


Furnace volume / Gas volume

PROJECT : NTECL / VALLUR TPP – 2 x 500 MW


Engineer AVR TITLE: FURNACE RESIDENCE TIME CALCULATION
Rev. with MA DWG :
Approved by MA/SCS Sheet : 2 of 2 Rev.00
NTECL/ Vallur TPP Stage-I, Phase-II (2 x 500 MW)
BHEL Point wise replies to NTPC Comments on Furnace performance & sizing calculations and
Furnace Residence Time Calculation

S.
NTPC Comments BHEL Reply
No.
NTPC DRAWING NO:0260-101-01-TR-PVM-U-020
Vendor Drawing No: TP-DC-288-100-0034
Revision: 02
Drawing Title: Furnace performance & sizing calculations
Category:II
1 BHEL to correct the marked values in line The losses furnished are due to latent heat
with losses given in performance data(i.e. of vaporization of H2 & H2O combustion, in
for DC calculation sheet- losses due to H2O line with earlier NTPC projects. Revised
in fuel,surf. & inherent- 2.598% and due to document (Rev.03) attached.
H2O from comb. of H2-5.472%. hence loss
due to moisture and H2 combustion is =
(2.598+5.472)x1233.6/100= 99.55
Mkcal/hr).Further, values of moisture loss
indicated here does not match with values
mentioned in predicted performance data
and needs to be corrected. This comment is
also applicable for WC/BC calculations.
2 Approval will be subject to approval of Noted
performance data by NTPC. Any change in
performance data shall be incorporated in
this document.
3 Other comments marked on the document. Revised document (Rev.03) attached.

NTPC DRAWING NO:0260-101-01-TR-PVM-U-007


Vendor Drawing No: TP-DC-288-100-0032
Revision: 00
Drawing Title: FURNACE RESIDENCE TIME CALCULATION
Category:II
1 BHEL to furnish the basis of arriving at Furnished information is in line with earlier
mean gas temperature NTPC projects
2 BHEL to submit performance data to check Predicted Performance Data submitted
the gas flows. already
3 BHEL to furnish the gas density at mean Furnished information is in line with earlier
gas temperature along with its back-up NTPC projects
calculation.

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