Deaerator exhaust heat recovery device
1、 Overview
Deaerator exhaust steam is mostly directly discharged into the atmosphere in most power plants and stations across the country. On the one hand, it causes heat loss, affects economic benefits, and on the other hand, it also causes environmental problems such as air pollution and excessive exhaust noise. At the same time, it also occurs in northern China. In the winter when the temperature is low, phenomena such as hanging ice edges at the exhaust outlet of the deaerator and large-scale icing on the top of the machine room occur. (Due to the mixed condensation of saturated steam and cold air into water, ice edges falling and hitting people have occurred, and machine room pressure damage has occurred.) In order to solve the above problems, improve economic benefits, save energy, and eliminate environmental problems caused by this, our company has cooperated with scientific research departments to launch the deaerator exhaust steam recycling and utilization project. The device has been used by dozens of power plants, power stations, and chemical units, The effect is very good and has received high praise from users (this device is suitable for waste heat recovery of heat exchange equipment such as continuous discharge expansion vessels and periodic discharge expansion vessels).
2、 Advantages
1. The structure is simple and does not require maintenance for long-term use.
2. Good heat and mass transfer effect, significant energy-saving effect.
3. Safe and reliable operation with no adverse effects.
4. Eliminating air pollution and noise pollution caused by exhaust, optimizing the environment.
5. Improved the inlet water temperature of the deaerator's desalinated water, reduced the dissolved oxygen content, and played a role in energy conservation and consumption reduction.
3、 Working principle and installation diagram
The desalinated water (or condensed water) and exhaust steam from the deaerator enter the recovery device, which uses a surface heater to transfer the heat of the heated steam to the water inside the tube bundle through a metal heating surface, thereby raising the temperature of the desalinated water (or condensed water) and achieving the purpose of residual steam recovery and utilization.
4、 Quality standards
1. This equipment is designed, manufactured, and accepted in accordance with GB151-1999 "Shell and Tube Heat Exchanger" and "Technical Specification for Construction and Acceptance of Electric Power Construction".
2. Implement the Safety Technical Supervision Regulations for Pressure Vessels
3. Adopting the GB150-1998 standard for steel pressure vessels.
5、 Ordering Notice
The purchaser shall provide the relevant parameters of the deaerator (output, pressure, temperature, exhaust volume) and the on-site installation location of the recovery device.
6、 Outline dimension table
|
Model H |
D1 |
D2 |
D3 |
D4 |
D4 |
D5 |
D6 |
DN |
|
CYH-75 |
1800 |
65 |
65 |
40 |
40 |
40 |
40 |
350 |
|
CYH-100 |
1950 |
80 |
80 |
50 |
50 |
40 |
40 |
400 |
|
CYH-150 |
2200 |
100 |
100 |
65 |
60 |
65 |
40 |
450 |
|
CYH-220 |
2300 |
125 |
125 |
80 |
65 |
80 |
50 |
500 |
|
CYH-300 |
2400 |
125 |
125 |
100 |
65 |
100 |
50 |
550 |
|
CYH-420 |
2500 |
150 |
150 |
100 |
80 |
100 |
65 |
600 |
|
CYH-680 |
2600 |
150 |
150 |
100 |
80 |
100 |
65 |
650 |
|
CYH-1100 |
2800 |
200 |
200 |
125 |
100 |
125 |
80 |
700 |
7、 Comprehensive benefit analysis
1. Environmental benefits
After the operation of the residual steam recovery device, the environmental problems caused by the exhaust of the deaerator, such as exhaust pollution and excessive noise, have been completely solved.
2. Recovery of exhaust heat and exhaust drainage
Taking the 100T/H low-pressure deaerator as an example for analysis:
Output 100T/H, working pressure 0.025MPa, working temperature 104 ℃
Saturated steam enthalpy value i=2684kJ/Kg
The exhaust steam volume is calculated at 3kg/ton of water (Kg/h), resulting in 300Kg of saturated steam being discharged per hour.
Year (calculated based on 7200 hours)
Recycled hydrophobic material approximately 300 × 7200=2160000Kg=2160T
Calculated at 6 yuan per ton of hydrophobic (saltwater free), equivalent to RMB 12960
The annual heat emission of the 100T/H low-pressure deaerator is calculated based on 7200 hours per year
300×7200×2684=5797440000KJ
The calorific value of standard coal is 29271KJ/Kg
5797440000÷29271=198090.9Kg=198.061T
After the 100T/H low-pressure deaerator is put into the exhaust steam recovery device, the annual coal savings are 198.00T
According to the market coal price of 700 yuan/T, equivalent to RMB 138600.00
Overall total: 138600+12960=151560.00 yuan.
Based on the above single case analysis, one 100t/h low-pressure deaerator, after being put into the deaerator exhaust heat recovery device, plays a significant role in energy conservation and consumption reduction, improving economic benefits (saving about 150000 yuan per year), optimizing the environment, and other aspects. It is a product with dual energy conservation and environmental protection.
