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Some common sense of graphite cooler
Release time:
2022-09-23
Graphite cooler manufacturers believe that the corrosion problem is more prominent in the production of allied alkali, because the mother liquor of allied alkali is mainly a multi-component mixed mother liquor containing sodium chloride, ammonium chloride, sodium bicarbonate and other salts. It is a strong electrolyte, which is more favorable to electrochemical corrosion, especially when the free ammonia content in the solution is high and the solution has a certain flow rate. Therefore, the selection of equipment and piping for the production of soda ash is often selected after strict anti-corrosion treatment of carbon steel, cast iron, stainless steel and even titanium.
Graphite cooler manufacturers believe that the corrosion problem is more prominent in the production of allied alkali, because the mother liquor of allied alkali is mainly a multi-component mixed mother liquor containing sodium chloride, ammonium chloride, sodium bicarbonate and other salts. It is a strong electrolyte, which is more favorable to electrochemical corrosion, especially when the free ammonia content in the solution is high and the solution has a certain flow rate. Therefore, the selection of equipment and piping for the production of soda ash is often selected from carbon steel, cast iron, stainless steel and even titanium after strict anti-corrosion treatment.
Graphite cooler manufacturers believe that the feasibility of impermeable graphite equipment applied in the soda ash industry carbon steel equipment corrosion treatment is often used to protect the coating, the better coating is thermosetting phenolic resin or epoxy resin. For example, the mother heat exchanger and external cooler made of carbon steel are often used in this way of anti-corrosion, but this anti-corrosion method of construction is complicated, and another disadvantage is that the heat transfer efficiency of the corrosion-resistant heat exchanger is greatly reduced, thus increasing the heat transfer area. However, equipment made of stainless steel or titanium is quite expensive, which makes it difficult for manufacturers to afford.
Graphite cooler manufacturers believe that impermeable graphite equipment is widely used in chlor-alkali industry, pharmaceutical industry and inorganic salt industry due to its excellent corrosion resistance, such as the condenser for recovering acetic acid solvent in pharmaceutical industry, the hydrochloric acid synthesis furnace and falling film absorber in chlor-alkali industry, the reboiler for recovering methanol in aminoacetic acid industry, and the multi-effect evaporator in potassium carbonate industry. As the impermeable graphite equipment is made of graphite impregnated with resin, the potential of graphite is as high as 0.37v, and the thermal conductivity is as high as 108-124w/(m. K), which is 2.3-2.5 times higher than that of carbon steel and cast iron, and nearly 8 times higher than that of stainless steel and titanium. As far as the impermeable graphite equipment impregnated with phenolic resin is concerned, it has good corrosion resistance to non-oxidizing acids, salt solutions and weak bases, but poor corrosion resistance to oxidizing acids such as nitric acid and chromic acid, and it is a brittle material. Therefore, graphite cooler manufacturers believe that its application pressure should not be too high, generally controlled below 0.6MPa, as the mother liquor of the United Alkali industry, its ph value is about 8-10. as a weak alkaline solution. Its temperature is lower than 50.From concentrated gas alkali, its operating pressure is lower than 0.5 MPaa. Its process parameters fully meet the operating conditions of impermeable graphite equipment.
Graphite cooler manufacturers believe that graphite heat exchanger can be divided into three types according to its structure: plug hole type, shell and tube type and plate type. Block type: consists of several block graphite components with holes. Shell and tube heat exchanger: shell and tube heat exchanger occupies an important position in graphite heat exchanger, which can be divided into fixed type and floating type according to its structure. Plate type: Plate type heat exchanger is made of graphite plates bonded together. In addition, there are submerged, spray type and casing type (see coil type heat exchanger and casing type heat exchanger). Graphite heat exchanger has good corrosion resistance, the heat transfer surface is not easy to scale, good heat transfer performance. However, graphite is brittle, low flexural and tensile strength, can only be used at low pressure. Even if the pressure-bearing capacity of the better plug hole structure, its working pressure is generally only 0.3 ~ 0.5 MPa.
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BETTERS' GRAPHITE
Company Address:
No. 16, Jiangtong North Road, Gangzha District, Nantong City, Jiangsu Province
Contact: MR.He
Mobile: 86-13348070880
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