How to do chemical process design?

D. Plate heat exchanger

Plate fin type: compact, high efficiency, can be multiple strands of material heat transfer at the same time. The operating temperature is not more than 150℃.

Spiral plate: can be used with granular materials, good level utilization. Not easy to repair.

Umbrella plate: simple, compact, easy to clean, the use of temperature is not more than 150℃, the use of pressure is not more than 0.12MPa.

Corrugated plate: compact, high efficiency, easy to clean, the use temperature is not more than 150℃, the use pressure is not more than 0.15MPa.

E. Selection basis of air cooler

a. The air inlet temperature (i.e. the design temperature) is lower than 38℃.

b. The outlet temperature of the hot fluid is higher than 50 ~ 65 ° C, and a certain fluctuation range (3 ~ 5 ° C) is allowed.

c. The logarithmic mean temperature difference is greater than 40℃.

d. The fluid approach temperature (that is, the difference between the exit temperature of the hot fluid and the entrance temperature of the cold fluid) is at least 15 ° C.

e. The heat transfer coefficient in the pipe is less than 2325.6W/(m2.K).

f. The fouling coefficient of cooling water is greater than 0.0002(m2.K)/W.

g. The water source is far away, and the cost of water collection is large.

h. The freezing point of hot fluids is low (less than 0℃).

▲ Chemical pump

According to the nature of the material, the corrosiveness of the material, flammable and explosive, toxic, high temperature, high pressure, low temperature, viscosity, volatility, solid particles and other factors, in addition to considering the safety, reliability and sealing requirements of the pump.

▲ Container (storage tank)

According to the nature of the material, corrosiveness of the material, inflammable and explosive, toxic, high temperature, high pressure, low temperature, viscosity, volatility, solid particles and other factors.

Storage tanks can be roughly divided into two categories according to use, one is for storage, generally refers to the storage of raw materials, intermediate products or finished products, raw materials and finished products storage generally has a great relationship with the external transport of the factory, intermediate product storage and the production of the intermediate product before and after the device has a great relationship. For example, it is necessary to consider the production cycle of the front and rear devices, the normal start and stop and the accident stop situation to determine the amount of storage. This type of tank farm is generally set up separately. The other is the storage tank required for the process process in the device, which usually has a return tank (residence time takes 5 to 10 minutes), a receiving tank and a buffer tank (usually takes 20 minutes), a gas-liquid separation tank (usually takes 2 to 3 minutes), a liquid-liquid separation tank, etc.