The difference between the desulphurization butterfly valve and the denitrification butterfly valve The desulphurization and denitrification process principle The flue gas denitrification butterfly valve

The 2507 desulfurization and denitrification butterfly valve must meet several requirements for corrosion, wear, flow rate, temperature, etc. All kinds of fossil fuels contain sulfur. In particular, coal produces a large amount of SO2 after combustion, which seriously pollutes the air. To control pollution, the method is flue gas desulfurization. The 2507 plate desulfurization butterfly valve has a simple structure, small size and light weight. By turning the handle 90°, the valve can be opened and closed easily, and the valve can be kept at the required opening angle.

Features:

Shaft plate without pin connection, light structure, convenient transportation, installation and maintenance

90 ° open and close, switch quickly. Low operating torque, light and effortless

Soft seal, zero leakage, long service life

Choose different parts material, suitable for a variety of media

Surface epoxy resin coating, anti-corrosion, beautiful

Drive mode selectable handle, turbine, electric, pneumatic

Including China, the currently widely used in the world is the "lime (limestone)-gypsum" wet desulfurization technology. This process system involves a variety of corrosive media and contains particulate material that produces strong corrosion and wear on the equipment. Therefore, there are special requirements for the material and structure of the valve. In the late 1980s, when China introduced large-scale desulfurization technology abroad, the valve body of the imported butterfly valve was made of EPDM rubber. The disk and valve stem were made of Hastelloy. Because of its high price, the current More and more users use duplex stainless steel discs. Duplex stainless steel combines the characteristics of austenitic stainless steel and ferritic iron stainless steel. It combines the excellent toughness and weldability of austenitic stainless steel with the high strength of ferritic stainless steel. Combined with resistance to chloride stress corrosion, and developed rapidly as a weldable structural material in the late 1980s, it has become an important category in stainless steel. Compared with other types of stainless steel, it has the following characteristics:

1. The molybdenum-containing bidirectional stainless steel has good chloride stress corrosion resistance under low stress, and can replace the austenite 18-8 stainless steel that is prone to stress corrosion cracking under this medium condition;

2. The molybdenum-containing bidirectional stainless steel has good pitting corrosion resistance. When the anti-pitting equivalent (PRE) is the same, the critical pitting potential of the bidirectional stainless steel and the austenitic stainless steel is similar. The pitting resistance of the bi-directional stainless steel containing 18% Gr is comparable to that of AISI 316L. The corrosion resistance and crevice corrosion resistance of 25% Cr, especially nitrogen-containing high-chromium bidirectional stainless steel, exceeds that of AISI 316L;

3, good corrosion resistance and wear resistance;

4, good solderability, no heat treatment after welding, welding joints have good corrosion resistance;

5. Compared with Hastelloy, its price is much lower. Steel Chrome (Cr) Nickel (Ni) Molybdenum (Mo) Nitrogen (N) Carbon (C) 254SMO 20 18

6.1 0.2 0.02 UNS N08367 20.5 20 6.2 0.22 926 (1.4529) 20 25 6.0 0.2 0.02 This is a class of low carbon high molybdenum nitrogen containing austenitic stainless steel. The outstanding characteristics of this type of steel are excellent corrosion resistance in chloride environments, including resistance to pitting, crevice corrosion, stress corrosion, and general corrosion. Corrosion resistance is also very good in many reducing acid media. In addition, because of the high nitrogen content in this type of steel, it has a higher strength than the conventional austenitic stainless steel. This type of steel is mainly used in seawater equipment, bleaching equipment in the pulp and paper industry, valve components in flue gas desulfurization systems, and containers and pipelines for handling and conveying halogen-containing compound media. These super austenitic stainless steels, in general, have similar performance. As the amount of nickel (Ni) increases, the performance slightly increases, but the price also increases.