Technical requirements for the procurement of ash elbow of pneumatic ash conveying system
1. Parameters: 31.1 Pressure: 06mpa；Temperature 120:
3.1.2. Economizer: DN100, elbow radian radius r=600mm;
3.1.3 Bag filter: DN152; Elbow radian radius r: 750mm;
3.2 Material: Q235 steel and ceramic tube components;
3.3. The elbow is lined with a whole ceramic pipe with a thickness of 10mm, and the butt of each two ceramic pipes is seamlessly connected or the ceramic pipe adopts an interlocking ceramic structure (convex and concave inlay anti-falling type), which is used for pneumatic ash conveying system, with a thickness of 10mm for steel pipes and a thickness of 10mm for ceramics;
3.4. The same inner diameter pipe is the same, and it is made according to 1mm;
3.5. The lining of ceramic blocks is tight and seamless between the blocks, the surface is smooth and smooth, and no adhesives or other substances are used to fill, and the debris in the pipe needs to be cleaned after the ceramic tube is formed, and the lining should show the natural color of the ceramic;
3.6. The ceramic pipe and outer pipe of the ash pipe shall be produced by cutting the whole ceramic pipe and seamless steel pipe, and a single straight pipe shall not be produced by multi-section splicing; Party B needs to mail the sample, and after Party A accepts the sample, Party B takes the sample process and quality as the product production standard, and the sample is 3Parametric production of ash pipelines in 18 supply lists.
3.7. The design of ash pipe and elbow should meet the requirements of anti-wear, anti-vibration, anti-shedding, anti-dust accumulation and good weldability;
3.8. The ash pipe and elbow should have sufficient strength and rigidity, and the pipe fittings will not be deformed and the ceramic sheet will not be broken or fallen off due to the local force of the pipe fittings when lifting;
3.9. In order to facilitate on-site production, the wear-resistant ceramic pipe needs to meet the requirements of on-site opening and fire welding;
3.10. Each ash pipe and elbow shall be inspected in accordance with the relevant standards and the certificate conditions that have been registered with the quality inspection department of Party B and allow the product to leave the factory;
3.11 Technical requirements for lined (seamless) steel pipes.
3.11.1. The material of the lined (seamless) steel pipe is Q235, and the wall thickness is 10mm;
3.11.2 Lined with seamless steel pipe, material Q235, seamless steel pipe for conveying fluid (GB T8163-2018) (pipes need to be pn1.)0MPa working pressure design and manufacture);
3.11.3. The inner and outer surfaces of seamless steel pipes are not allowed to have visible defects such as cracks, folding, scarring, rolling and delamination. Before leaving the factory, the steel pipe should be subjected to tensile test, bending test, impact test, flattening test and guided bending test;
3.12. Technical requirements for wear-resistant ceramics and adhesives;
3.12.1. High-quality alpha alumina powder with high purity, ultra-fine, single particle size and narrow distribution and spray drying granulation treatment is used as the original raw material, and the sintered alumina ceramic with high billet density and uniform density distribution is used to form the blank with powder dry pressing, and the ceramic thickness is 10mm;
3.12.2. Alumina ceramics should have strong anti-wear performance, good heat and corrosion resistance;
3.12.3. Performance indexes of alumina ceramics;
3.12.4. Adhesive: The inorganic adhesive synthesizer with high temperature resistance, low temperature resistance and high strength is used as the adhesive between the steel body and the ceramic sheet between the porcelain sheet and the steel body, with a thickness of 1mm, and the adhesive needs to have stable performance and strong impact resistance, and can run for a long time between -30 and +600 temperatures.
3.13 Technical requirements for wear-resistant ceramic layer.
3.13.1. Lined ceramic block type: convex and concave inlay anti-falling ceramic patch, between the porcelain block and the porcelain block in the circumferential direction through a unique sub-mother groove design concave and convex inlay to form a 360° mechanical self-supporting structure, the ceramic block is close to the inner wall of the steel pipe and pressed and attached to each other, and the porcelain tile gap is 02mm, the edge of the contact surface of all porcelain blocks adopts a tapered design to ensure that the porcelain blocks do not fall off.
3.13.2. The nozzle and the nozzle are connected with zero seams, and there can be no reserved sections. The porcelain tiles are tightly connected to each other or are made of a single ceramic tube.
3.13.3. The ceramic sheets in the pipeline are interlocked to form a whole, and the ceramic sheets are attached to the steel pipe and adhesive so that the pipeline can resist a certain impact ability, and the porcelain pieces are not easy to fall off. Ceramic patches are made according to the inner diameter of the steel pipe.
3.13.4. Each circle of adjacent ceramics should be arranged in a staggered manner, pasting longitudinal seams, and not in a line.
3.13.5. The surface of the ceramic sheet lined with ceramic should be flat and smooth, and the finish should reach 04. The conveying resistance is small, the material can pass freely, and there is no hanging and blocking of the material.
3.13.6. After the construction of the ceramic lining is completed, its surface should be smooth and flat, without convex and uneven places, and the unevenness should not exceed 02mm。Ensure that the ceramic sheets attached to the inner wall of the steel pipe are arranged tightly, without gaps, and the inner surface is smooth; In the assembly process, between the ceramic sheet and the ceramic sheet, and between the ceramic and the inner wall of the steel pipe should be coated with adhesive to ensure that the ceramic layer is tightly combined with the inner wall of the steel pipe, and the wear-resistant ceramic pipe after forming is impact-resistant and wear-resistant.
3.14 Mechanical Properties.
3.15. All structural components shall be treated and painted according to the requirements of Party A. Surface treatment and paint should meet the relevant standards.
3.16. The outer middle of all pipelines shall be marked with the specifications and models of the standard, the flow direction of the medium, etc.