Technical Measures for Construction of Boiler Superheater of 2 × 600MW Unit in Power Plant
1.1 Project overview 1.1.1 Scope of work This project is the installation of boiler superheater of 2 × 600MW supercritical air cooling unit 1 in the new project of CPI Baicheng Power Plant. 1.1.2 Project characteristics: 2 × 600MW supercritical air cooling unit 1 of Baicheng Power Plant Phase I Project of China Power Investment Corporation, the boiler is 2070t/h supercritical parameter variable pressure once through boiler, and the boiler equipment is manufactured by Harbin Boiler Works Co., Ltd. The boiler is a supercritical primary intermediate reheat once through boiler with a single furnace, front and rear wall opposite blowing combustion, balanced ventilation, tight sealing, solid slag discharge, and high-strength bolt suspension structure. 1.1.3 Technical characteristics The superheater is divided into ceiling superheater, wall wrapped superheater, horizontal flue side wall superheater, middle partition wall superheater, hanging tube superheater, low temperature superheater, platen superheater and final superheater according to the medium flow direction. 1.1.3.1 Ceiling superheater The ceiling superheater is located above the boiler furnace and the tail flue, and forms a closed flue gas flow channel together with the four side water-cooled wall and the wall enclosure superheaters on each side. The ceiling superheater is divided into front, middle and rear parts. The front part forms the top of the furnace, the middle part forms the top of the horizontal flue, and the rear part forms the top of the rear flue. The front ceiling has 2 sections, the front section has 14 tube screens, and the rear section has 45 tube screens. The middle ceiling is a section of 102 dual tube panels, and the rear ceiling is a section of 102 dual tube panels; The front pipe is (φ 63.5 × 10mm, material 15CrMoG), the middle ceiling pipe is (φ 63.5 × 10mm, material 15CrMoG), and the rear ceiling pipe is (φ 44.5 × 7mm, material 15CrMoG). 1.1.3.2 Wall enclosure superheater Wall enclosure superheater includes: front wall enclosure, middle partition wall, rear wall enclosure, left and right wall enclosure of rear flue gas shaft. The wall wrapped superheater is delivered in pieces, except the upper part of the front side wall and the middle partition wall is supplied separately. The header on the front wall is composed of two sections (φ 273 × 60mm, material SA-335P12), with an elevation of 71040mm; One upper header (φ 273 × 60mm, material SA-335P12) on the left and right of the side enclosure wall, with an elevation of 71040mm; The header on the middle partition wall is composed of two sections (φ 273 × 65mm, material SA-335P12), with an elevation of 72340mm; The header under the four side enclosure wall is a ring header (φ 457 × 98mm, material SA-335P12) with an elevation of 49660mm. The header under the middle partition wall is in two sections, and the elevation of the header is 49160mm (φ 273 × 65mm, material SA-335P12). Front wall enclosure superheater: it is divided into two sections, the upper section is 203 loose tubes, and the lower section is 10 tube panels. The tube diameter is (φ 57 × 9, material is 15CrMoG).