Technical renovation of primary air temperature for waste heat heating boiler in fixed discharge expansion vessel
Background of Technological Transformation:
Boiler # 3 ensures a certain amount of continuous and regular discharge to meet the normal operation of the boiler. These wastewater are subjected to flash evaporation expansion in the designated discharge expansion container, and the flash evaporation steam is directly discharged into the atmosphere. Resulting in steam waste, in response to issues such as low exhaust gas temperature and poor heat transfer efficiency of the air preheater during the operation of the boiler and the discharge of exhaust gas from the fixed exhaust expansion vessel, after communication between workshop technicians and multiple technical personnel in the same industry, the exhaust gas from the fixed exhaust is used to heat the inlet air temperature of the primary fan, increase the primary air temperature, reduce the temperature difference of the boiler air preheater heat exchanger, increase the boiler operating cycle, and reduce waste of exhaust gas.
Technical transformation purpose: To increase the inlet air temperature of the primary fan, reduce the heat exchange temperature difference of the air preheater, and minimize the blockage of the air preheater. Extend the operating cycle of the boiler
Technical renovation investment: The materials and equipment used are all refurbished and waste materials, and the construction is independently made to reduce production costs and maintenance expenses.
Implementation effect: The project was officially put into trial operation on March 10, 2023. After being put into operation, the temperature of the external heat exchanger reached about 90 ℃, and the difference between the primary air temperature and the secondary air temperature was 6 ℃ -10 ℃ under the same conditions. The calculation of the effect data:
Specific gravity of air: 1.85KG/m³
Specific heat of air: 1.006KJ
According to the heat formula Q=cmt,
The heat required to raise the temperature of one cubic meter of air by one degree,
Q=1.003J/(kg*K)*1.29Kg/m3*1m3*1K
=1.29387J.
Because 1 calorie equals 4.18 joules, and 1 large calorie equals 1000 calories.
So 1.29387 joules=1.29387 ÷ 4.18 calories=0.3 calories
0.3 kcal=0.3 ÷ 1000 kcal=0.0003 kcal.
A one degree temperature rise of one cubic meter of air requires 0.0003 kcal of heat.
0.0003 * 55000 (primary air intake) h/m ³ * 6 (temperature 4 ℃ -11 ℃, calculated at 4 ℃)/6200 (coal calorific value) * 1400 (coal price)=14.9 yuan
14.9 * 24 (hours) * 30 (days)=10730 yuan
According to the comprehensive data calculation, the heat recovery from exhaust gas can reach about 10730 yuan per month.
All construction materials and pipes are made of recycled materials, using old parts to the greatest extent possible to save costs and improve efficiency.
At present, the project is undergoing upgrades and renovations on its current basis, and the upgrade and renovation will be completed on May 1st
After the renovation is completed
