1 Products Description
Esterification reaction tank is one of the important equipment in production. Due to the corrosion of weak organic acid, the surface of 16m stainless steel esterification tank has lost its luster and the weld has been corroded within less than half a year. The reaction tank is replaced every two years, and during this period, it needs to be overhauled and replaced irregularly. Due to frequent overhaul and replacement of parts, together with production suspension, a lot of manpower, material resources and financial resources are wasted every year. Titanium metal is an excellent corrosion resistant material with good corrosion resistance, high strength, small proportion and good processing performance. Moreover, the corrosion resistance of titanium is not affected by molding, heat treatment and welding. The test shows that titanium can be used instead of stainless steel.
2 Material selection of main body of esterification tank
The price of titanium is relatively expensive (about 7 times of stainless steel by weight, but the proportion of titanium is only 0.57% of stainless steel. In fact, the price of titanium is about 5 times of stainless steel). It is obviously uneconomical to use all-titanium cans.
Because the reaction tank is under external pressure, the elastic modulus of titanium is half of that of stainless steel, and the thickness of titanium required for all-titanium vessels will also be increased. In addition, titanium and carbon steel cannot be welded, and GR1 Titanium Clad Steel Plate for rectors can solve the connection problem of the reaction tank body, jacket, and other parts.
Titanium composite is a whole formed by carbon steel at high temperature and high pressure, which makes molecules at the interface penetrate into each other and melt in the lattice. Metallurgical combination is achieved between them. Therefore, titanium composite can withstand large thermal stress, vacuum suction and other loads. Table 3 lists the specifications of the main material titanium composite plate of the esterification tank.
3Manufacturing and processing characteristics of esterification tank
The processing and manufacturing of esterification tank mainly involves plate blanking, welding and forming, and the rolling of cylinder. The manufacturing and processing characteristics of titanium are determined by its easy oxidation, high hardness, high strength, small elastic modulus and easy peeling of composite plates.
1. The scribing of titanium composite plate shall be carried out on the base plate. It is forbidden to punch holes on the titanium plate.
2. The cutting of titanium composite plate is carried out by mechanical method, and cannot be processed by oxygen-acetylene flame.
3. The welding process must be carried out by reliable and good protective measures and experienced and skilled welders. See Table 5 for welding specifications.
When manufacturing the cylinder with titanium composite plate, in order to prevent the peeling of the composite layer, it is not easy to press too much at one time when rolling the plate. The principle of less pressing and more rolling should be adopted. It should be noted that when rolling, do not stay at the uncomplicated part, so as not to cause the expansion of part of the area and the peeling of the composite layer.
4 Comparison of economic benefits
After installation, the inner wall of the esterification tank has been bright after nearly one year of operation, and there is no corrosion trace on the welds, which has not been repaired once a year. The original stainless steel esterification tank is overhauled once a month and needs to be shut down for 0.5 days. The labor cost and material cost for each overhaul plus the indirect loss caused by the shutdown are equivalent to 12000 yuan. Compared with the equipment investment of titanium esterification tank and stainless steel esterification tank, the investment of a stainless steel esterification tank is 170000 yuan. Although the one-time investment of titanium is 2.4 times of that of stainless steel, the service life of the equipment is extended. It is predicted that the service life of the equipment will be more than 10 years, while the stainless steel equipment is replaced every two years, and the average annual investment of the equipment can be saved by 44000 yuan. The application of titanium composite plate in the reaction tank of esterification tank not only extends the overhaul period of the equipment, It also reduces the unnecessary trouble caused by regular maintenance of equipment to normal production, and also realizes civilized production.
Titanium equipment is widely used in reaction tank, heat exchanger, storage tank and evaporator equipment in the whole plant, and has achieved good economic benefits. However, the price of titanium is relatively high and the one-time investment is high, which restricts the application of titanium to a certain extent. Because the price of GR1 Titanium Clad Steel Plate for rectors is relatively economic, it is the direction of titanium material promotion and application in the future, and even necessary for some equipment material selection.
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