Special heat recovery device for sewage discharge

The energy-saving continuous sewage collector is a device that effectively uses the sewage heat loss and is used to heat the boiler or deoxygenate the water supply, and its use can increase the boiler water supply temperature by 10%-15%, which brings considerable economic benefits for the boiler energy utilization.

1. The continuous blowdown expander is connected to the continuous sewage outlet of the boiler, and the drainage is discharged after expansion and reducing the release of latent heat in the expander, and the secondary steam generated can be used (led to the deaerator, etc.).

2, regular sewage outlet connection, a certain pressure of higher temperature sewage by expansion, cooling and pressure relief after the release of latent heat discharge.

Sewage discharge energy collector device features:

a, water separation and expansion container: high pressure and high temperature sewage first water separation, two steam into the heat deaerator. A pressure gauge, a glass level gauge and a safety valve are arranged on the expanding vessel.

b, automatic level control valve: automatically control the level height of the sewage expansion container, effectively realize the separation of water and water. High temperature water is recycled into boiler or deaerator.

c, waste heat recovery and utilization: the use of high-efficiency heat exchanger to heat the boiler feed water, improve the boiler water temperature, and further reduce the boiler sewage temperature.

d, auxiliary equipment: control cabinet, safety valve, temperature meter, pressure gauge.

e, can recover 85% of continuous sewage heat energy;

f, safe can withstand high load operation, easy installation, reliable operation, easy maintenance and management.

Value of waste water recovery equipment (20t/h boiler blowdown)

1, secondary steam evaporation rate

The enthalpy of water in boiler drum is 177Kcal/Kg, the constant pressure of blowdown expansion vessel is 0.1MPa, the enthalpy of water in expansion vessel is 120Kcal/Kg, the enthalpy of secondary steam is 646Kcal/Kg, and the evaporation rate of secondary steam is X, and X=0.11 is determined

2, the amount of steam saved (sewage rate is calculated according to 5%, boiler efficiency: 70%, coal heating value: 5000Kcal/Kg, coal price: 1000 yuan /T)

D=20×5%×0.11×24 × 300D ≈800t/ year;

3, the value of heat conversion is

D x 646 / (0.7 x 5000 x 1000 = 800 x 646 / (0.7 x 5000 x 1000 = 6.77 per year

4, waste heat utilization value of sewage (sewage discharge temperature is about 40%)

20×5%×(120-40)×24×300/(0.7×5000)×1000= 60,800 / year

5. Total energy saving value: 67,700 + 60,800 = 128,500 yuan/year

6. Environmental benefits

1) Eliminate white pollution and thermal pollution of waste steam.

2) After the sewage temperature is reduced to about 40%, the thermal pollution is reduced; Waste water can be used for dust removal or sanitary cleaning.

Equipment technical parameter

1. Continuous blowdown expander

2, regular blowdown expander