Utilization of return water from primary cooler
Thread Content
Does anyone know the return water temperature of the primary cooler? I would like to see if it can be exchanged for bath water or heating water to achieve energy saving.
Yes, many factories in the north have heating sections.
The uppermost layers of the primary cooler can be connected separately and added with circulation pumps for winter heating.
Yes, our company's design has been initially finalized. Only the top sections are used and modified separately. They are used for heating in winter and will not be affected in summer!
The vertical tube type primary cooler uses one section of water for heating in winter, while the horizontal tube type primary cooler is designed to provide heating in the upper section. When the water outlet temperature is too high, it can be mixed with the second section of water for heating.
Our plant is cooled in sections. The return water temperature in one section is 40 degrees. It should be usable. I know our plant is in the south and it is not too cold, so it is useless. It should be usable in the north.
It is completely possible to use the residual heat after the initial cooling to heat the bath water, but the quality of the circulating water may not be good. Do I need to add an extra heat exchanger? Engineering modification is very simple. Most coking enterprises in the north use one section of the primary cooler for heating in winter. The return water temperature can reach more than 60 degrees under high production conditions, which is of course related to the heating area. Can be calculated using heat balance.
Absolutely, our factory has been used for heating since 1990.
The circulating water in our unit contains too many impurities, which causes many butterfly valves along the primary cooler to not close tightly. It will be even more difficult to make bath water. Let’s take a look at everyone’s methods.~~
Generally it is best not to use it for bathing, as the heating effect is okay
Generally speaking, recycled water cannot be used directly as bath water. The water quality is indeed not very good and has many impurities. It must be heated and used to make bath water with clean water. It is very ideal for heating.
The upper end of the primary cooler uses a hot water section, which is used for heating in winter.
It can be used for heating, but not for bathing. The water quality is not good.
The circulating water in our factory is drawn from the Jinsha River. During the rainy season, the water contains heavy mud and the water quality is usually hard. It can only be used after pretreatment with chemicals and two precipitations. Circulating water is not suitable for bathing.
Our factory also uses this method for heating, which can save boiler steam in winter. This is also an energy saving project.
The law of energy conversion seems to be acceptable, such as heat recovery for coke quenching, but I think the companies that use it are not too popular. Is it because of the investment in equipment that the price-performance ratio is not very good? Is there any rough calculation in this regard?
I have never heard of it being used for bathing, but we use it for heating, saving 2 million yuan every year.
I am currently working in a coking plant in Northeast China. The upper section of the primary cooler is used as waste water, which is a common design for coking plants in the north. There is no problem. The temperature of the residual hot water can be as high as 58 degrees Celsius, but the temperature of the residual hot water also depends on the return water temperature and the loss of residual hot water (many residents drain water at night, resulting in system water loss), so industrial water with a lower temperature must be replenished.
Our unit is generally: The primary cooler is divided into three cooling stages: Used for heating during the winter. The third section uses groundwater as a preheating section for bathing water in summer.
Of course you can. Our company has been using it for more than ten years.