Issues related to the construction of 6-meter coke ovens

I. The construction progress of coke oven masonry shall be controlled in accordance with the provisions of the contract； II. The following points should be considered in terms of quality: 1. Several important control lines, such as the longitudinal center line of the coke oven, the center line of the side carbonization chambers, and the front line of the oven head; 2. Elevations: the elevation of the top of the regenerator chamber, the elevation of the bottom (top) of the carbonization chambers, and the elevation of the oven roof. 3. Linear dimensions of various parts of the coke oven. 4. The fullness of the refractory mortar in the masonry (especially in the gas duct bricks and combustion chamber walls) and the size of the grout joints. 4. The specifications of refractory materials shall comply with **relevant standards.

Impact on construction progress: the arrival time and order of fire-resistant bricks, the availability of water and electricity at the construction site, the presence of construction workers and supervisors. Bricks should be laid in a dry pattern according to the construction drawings, so as to check the bricks and joints. When constructing using the method of marking lines layer by layer, the construction sequence should be: marking lines, arranging bricks, building, grouting, cleaning, and inspection and acceptance. When arranging the bricks, a dedicated person should be assigned to check for any damaged bricks or bricks of the wrong type ； The refractory storage area needs to be protected from rain and to prevent the bricks from getting mixed up. During masonry, the mortar is required to be fully filled ； For the bricklaying sequence, generally start from the stove tip and work towards the inside of the stove. When bricklaying the walls of the regenerator, start by laying the first gas pipe bricks at the furnace head areas on both sides and the central gas pipe brick, then draw a guide line and lay the remaining gas pipe bricks. In the sloped passage area, pay attention to the type of bricks used. During the construction of the sloped passage and the vertical brick gas ducts, it should be cleaned regularly, and a thorough cleaning should be carried out once construction is complete. Before laying the bricks at the turn of the sloped passage, the inner wall of the lower half of the passage must be thoroughly cleaned. After the elevation and flatness of the carbonization chamber floor have been verified to be satisfactory, construction of the carbonization chamber can proceed ； There should be no step difference between the upper and lower layers of the carbonization chamber wall. When constructing observation holes in the roof area of the furnace, rags should be used to block them, in order to prevent mortar, bricks, and other debris from falling into the vertical flue ； The plug bricks for the drying holes must be inspected individually in advance to ensure they are suitable for those holes.

During the masonry process, inspections and verifications should primarily be carried out in accordance with the masonry regulations provided by the design institute; daily checks on the construction quality as well as partial inspections are necessary! Be strict at the beginning; rebuild if necessary, otherwise it will be difficult to get things under control later on.

The quality must be strictly controlled in accordance with the construction plan, and the **standards for furnace construction** must be followed. The dimensions of various components, the mix ratio of mortar, and the inspection requirements for refractory bricks are all clearly specified in the construction plan. There must be no leniency toward the construction team – strict quality control is essential. Be prepared to deal with disputes with the construction company! Moreover, it is necessary to do a good job in motivating the inspectors, as furnace inspection is an extremely difficult process.