The gap causes the high-temperature flue gas in the furnace to pass through the gap to the surface of the furnace shell, so that the surface temperature of the furnace rises and the heat loss increases, resulting in a decrease in the efficiency of the whole furnace.
2. The fiber felt is made of aluminum silicate fiber, which has low surface erosion resistance and easily causes the aluminum silicate fiber felt to fall off during the long-term high temperature scouring process.
3. Due to the rough surface of the aluminum silicate fiber felt, the heat reflectivity is only 50%, the radiant heat of the furnace tube is low, and most of the heat is taken away by the flue gas, which causes the boiler to have a high exhaust gas temperature and a low thermal efficiency.
Through analysis, the key problems to be solved are the shrinkage joints, the insulation layer falling off and the heat reflection rate of the insulation layer are low. The following new processes are adopted for this purpose.
1. The aluminum silicate fiber felt is used to compress the folded block by the human body. The heat-insulating structure fixed by the nail frame and the far-infrared radiation coating is applied on the surface. The folding block is pre-compressed by 30% and then fixed and fixed. When the shrinkage creates a gap, the compression folded block expands under the release of the pre-compression force to compensate the gap. The longitudinal contraction of the heat-insulating folding block is compensated by the expansion of the longitudinal compression compensation strip, thereby eliminating the shrinkage gap.
The oil field steam injection boiler is designed for oil field thermal oil recovery and is the key design for oil field heavy oil exploitation. China's heavy oil production using oilfield steam injection boilers began to be introduced in the United States, Canada and other countries. With the gradual expansion of oilfield thermal mining scale, the number of steam injection boilers in the oilfield is increasing. At present, the oilfield steam injection boilers used in various oilfields in China are basically manufactured by Shanghai Sifang Boiler Factory, Fushun Eight Company and Xinjiang Petroleum Administration Bureau. The head office manufactures, the oil field steam injection boiler and the auxiliary sound are imported technology, with high degree of automation, many imported parts and high sound quality.
The traditional heat preservation process of the boiler is a flat rivet process structure), which has the following defects: 1 The heat insulation layer uses the rivet nail to splicing and shrinking the seam during the process of shrinking due to frequent shutdown of the furnace (including longitudinal, lateral direction and thickness), so that the original spell The joint creates a large gap, and the flat boiler shell layup also produces shrinkage 01 surface coating HTEE far infrared radiation coating. Because of the small thermal conductivity of the coating, the thermal resistance is large, the heat conduction loss of the refractory material can be reduced, and the coating is In case of high temperature, it can be sintered into a hard shell with dense structure, anti-oxidation and anti-airflow, and protect the aluminum silicate fiber felt insulation layer, thereby solving the problem that the original insulation layer is detached due to smoke flushing. In addition, the far-infrared radiation coating has a heat reflectivity of up to 94%, so that more radiant heat is reflected to the furnace tube, so that the thermal efficiency of the boiler is greatly improved.
Firstly, on the two steel plates, the old process of flat staking and the new technology of folding block nailing are used to make the thermal insulation sample to simulate the boiler insulation structure, and then burned with high temperature acetylene oxygen flame, and heated to 1100% of the actual furnace temperature after 3 minutes. 950C) After cooling, after cooling, it was found that the old process test piece produced shrinkage joint, the outer surface temperature of the steel plate was 95C, the new process test piece did not produce shrinkage joint, and the outer surface temperature of the steel plate was 55C. Many tests proved that the new process can not only solve the shrinkage crack problem. It can also reduce the surface temperature of the boiler and improve the thermal efficiency of the boiler. The effect is obvious.
After the simulation test, the new process was applied to the overhaul of the insulation layer of two 23t/h oilfield steam injection boilers. After 6 months of use, the insulation effect of the old and new processes was compared. The main project was: measuring the furnace under the approximate working conditions. The surface temperature of the shell and the thermal efficiency of the whole furnace are measured. After the furnace is cooled, the integrity of the boiler insulation layer is checked.
The surface temperature measurement is carried out in the same part of the boiler (1, the boiler is the old process insulation, 3, the boiler is the new process insulation layer), and the surface temperature is measured under the approximate working conditions. The results are as follows: the average surface temperature of the boiler 1, for 83C, 3, for 63.2C, the surface temperature of the boiler with the new process has dropped by 19.8C. (down 29 pages) Technical transformation equipment management and maintenance 2006 10 and turntable, reducing many links, easy to maintain and maintain .
The frame adopts a frame structure, and in the process, no matter which direction the six rods are subjected to a part of the load, the stiffness-to-weight ratio is higher than that of the conventional CNC machine.
The six rods and the CNC turntable form a seven-axis linkage CNC system that can realize the functions of a six-axis CNC linkage machine, especially for machining complex surfaces such as blades, impellers, propellers and complex mold cavities.
Since there is no physical coordinate system, the machine tool and workpiece coordinate conversion is completely realized by software. It is not necessary to find the workpiece like a traditional machine tool. The operator can easily establish the workpiece coordinate system, which saves a lot compared with the existing blade processing and setting. time.
High efficiency and high machining accuracy. Because of the function of linkage of more than five axes, the machining attitude can be kept optimal during the machining process. The efficiency is much higher than that of the four-axis CNC machine. At the same time, the machining accuracy is much higher than that of the four. The axis-linked machine tool has been tested. The profile of the machine tool blade is the highest machining precision of all CNC machine tools of Harbin Steam Turbine Works Co., Ltd.
High-performance open CNC system can realize real-time multi-task scheduling, such as off-line simulation and online detection of machining process, data exchange with various CAD/CAM systems and network multiplication, Chinese interface display, convenient for users.
With automatic tool change function, the sound-disc type tool magazine realizes automatic tool change, further improves the automation degree and processing efficiency, can reduce the labor intensity of the operator and reduce the unconsciousness. The technical characteristics of the machine tool The processing range The machine tool is different in the main axis. In the attitude, the processing range is different. When the angle between the main shaft and the Z axis is 27.00, it is 00mmX250mm; when the angle between the main shaft and the Z axis is 10. Main technical parameters: Maximum spindle speed: Spindle fast moving speed: 15000mm/min. Bidirectional positioning accuracy: A=0.022mm; Repeatability positioning accuracy: B = electric spindle: rated power 14kW; rated speed 1000000r / min; rated torque 110Nm; spindle gauge æŽ BT40. CNC turntable: center height chuck diameter 250mm. Tool magazine: hobbing cam type tool change structure With a maximum tool diameter of 76mm (full library), a tool diameter of about 150mm; the maximum tool weight CNC system consists of: industrial computer, MC card, servo motor drive, PLC. At present, the blade and impeller work line The design is more and more complicated, and it is difficult to realize the machining with three-axis and four-axis linkage. The five-axis or more linkages that are especially suitable for processing blades in the country are not much set up, and the foreign products are expensive. The machine is most suitable for use. For processing complex surface workpieces such as blades and impellers. In view of the simple mechanical structure of the machine tool, its cost performance is higher than that of the general five-axis or more linkage machine tool. Therefore, the machine tool will certainly attract more customers' attention. W06.10-16 Power Zone Peace Road No. 44 150040 Table 1 通å€åè®® Online configuration Network access LODAL communication protocol DH+ Connection device 1784-KT Baud rate 115.2KB/S Connection mode MULTI-DROP terminal LINE-2PLC address 3 Commercial Microcomputer communication slot ISA/EISAKT address 101011 site 002 table 2 pass-through channel configuration channel 2 baud rate 56.7KB / S site 003 excellent power level 1 connection identification 0 and channel configuration, configuration as shown in Table 2. Localization transformation For more than two years, the sound has been running smoothly.
The problem: to ensure the stability of commercial microcomputer power supply, UPS can be used to isolate power supply, to prevent power supply interference, and high-frequency electromagnetic interference.
The pass-through cable between PLCs is shielded and twisted communication cable, and the length is in accordance with the requirements of AB company.
The processor settings should match the operating conditions used.
After the transformation, the remote pass-through and monitoring were realized, the fault query speed was increased by 40 times, the network function between the programmers was increased, and the dual-machine hot sounds greatly improved the reliability of the set sound. More than 2 years of operation has shown that the expected results have been achieved, saving money (up to 25 pages). The boiler is tested for thermal efficiency under approximate conditions (boiler burning time is 40 min, fuel consumption is 0.355 t), and boiler average thermal efficiency is 1 76.2%, 3, 4 is 84.3%, and the thermal efficiency is increased by 8.1% after adopting the new process.
(Finish)
Stay Roller bottom guide comes equipped with an adjustable roller to prevent sliding door from swinging out away from the wall. The guide is both interior and exterior grade and offers a noiseless roll and smooth surface for the door to slide against for years. The stay roller guide provides a smooth, quiet roll and works with doors up to 3" thick. The stay roller guide comes with an adjustable wheel and in a Black or oil rubbed bronze powder coat finish and galvanized for a sleek look. It is optimal for larger doors and doors on exterior applications, and can also be used to attain a certain aesthetic style by adding bulk to the bottom of the door along with the Barn Door Hardware along the top.
Material: Iron
Sizes: 4.5inches etc
Usage: Barn doors control hardware.
Color: Powder coating black ,electroplating nickel,nickel plated and other customization
Stay Roller
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