1, flue gas volume to confirm the fuel is natural gas, according to the reaction equation CH4 + 2O2 = CO2 + 2H2O complete combustion 1molCH4 need 2mol O2 O2 accounted for 1/5 of the air required for complete combustion 1molCH4 10mol actual combustion air intake air excess coefficient 1.1 1molCH4 11mol After air-flue gas composition reaction was: 1mol CO2 8.3% 2mol H2O 17% 0.2mol O2 1.7% 8.8mol N2 73% accordingly: 1mol CH4 12mol products of combustion flue gas, natural gas per hour, burning 250 square produce smoke per hour the amount of 250 * 12 = 3000Nm? CO2, H2O, O2, N2 molecular weights were 44,18,32,28 located above the gas is ideal gas, then the gas density is marked at state ρ = 2, flue gas temperature Make sure the smoke temperature 450 ℃, take seasonal average user area temperature 20 ℃, flue gas dew point temperature 100 ℃, the flue gas recovery temperature 120 ℃. ? Heat demand calculation according to the customer, to be heated 150 tons fluxing pool 1, according to the most unfavorable conditions in winter, heated from 5 ℃ to 75 ℃, a total of 10.5 million kcal heat is required. Workpiece carry heat provided by the user, taking 10 tons per hour. 10 tons of steel increased from 5 ℃ to 75 ℃, the heat required for the 10000 × (75-5) × 0.46 × 10? J / (kg * C) = 89.44 kilowatts = 76,900 kcal. Conservative calculation, taking 80,000 kcal. Pool heat, most adverse environmental conditions calculated at 5 ℃ in winter, surface heat about 40,000 calories, peripheral heat about 30,000 calories, total 70 000 kcal. According to calculations, the workpiece fluxing pool heated to 75 ℃ for the first time requires heat 10.5 million kcal per hour during normal operation heat required approximately 150,000 kcal. Domestic water: bathe staff of 60 people, the daily water consumption per person is 50 ℃ hot water 100Kg, of 6 tons of hot water. Then meet bathing water heat is: 6 × (50-5) ÷ 10 = 27 million kcal meet these general terms, operation days heat equipment: (1050 + 27) ÷ (31-15) ÷ 24≈3 days. Third, the design claim 1, in the tail of the installation of hot-dip galvanizing furnace waste heat recovery to maximize heat recovery. 2, the use of heat recovery plus help crossing the pool. 3, through the use of heat after heating the water twice for workers bath. Fourth, the solution 1, the combined heat hot water heat recovery steam boiler furnace flue galvanized heat recovery steam boiler after about 0.2MPa ~ 0.3MPa steam, delivered to help the plating tank heat exchanger. Waste heat boiler to produce hot water for the hot water heat recovery steam boiler feed water, hot dip galvanizing furnace flue gas down to about 120 ℃. Energy saving analysis of heat recovery 310 000 kcal per hour, 24 hours, 7,440,000 kcal heat recovery takes natural gas calorific value 8500 kcal / square every day, the combustion efficiency of 95%, the absorption efficiency of 85%, the savings of natural gas to 7,440,000 / (8500 * 95% * 85%) = 1084 square take natural gas price 3.5 yuan / square, the daily saving of 3794 yuan. At this monthly savings 3794 * 30 = 113,820 yuan this way run, an estimated 1-3 months to recover the full investment. Shanghai Qingpu dawn hot-dip galvanizing plant in Taiwan 0.4T / H heat recovery steam generators Shanghai Xiang Xin metal surface treatment Co., Ltd. Taiwan 0.4T / H heat recovery steam boiler hot dip galvanizing plant in Taixing Hualong Taiwan 0.6T / H heat recovery steam Changshu Rong Sheng galvanized Ltd. Taiwan 0.4T / H heat recovery steam Tower Co., Ltd. Changshu style 2 0.4T / H heat recovery steam boiler hot galvanized Ltd. Zhangjiagang Hualin 2 0.4T / H heat recovery steam boiler Linyi Terumasa Tower Manufacturing Ltd. Taiwan 0.4T / H heat recovery steam Venus galvanizing Ltd. Kunshan Taiwan 0.6T / H heat recovery steam generators