Factors affecting the steam quality of steam boilers
The steam pollution of steam boilers is caused by mechanical carrying and dissolving. There are water droplets in the saturated steam, and the water droplets contain impurities, that is, mechanically carried. Some impurities can be dissolved directly by steam, ie dissolved. The root cause of steam pollution is that the boiler feed water contains impurities. The main factor affecting the steam quality of steam boilers is the pot water concentration, followed by boiler load, drum water level and boiler pressure. There are many bubbles in the boiling water in the boiler. When the bubbles rise and fall out of the water level, they will break down many small and scattered small water droplets. When the pot water concentration is low and the boiler water level, load, and pressure are normal and stable, these small water droplets are not easily taken away by the steam. Because the water droplets themselves have a certain weight, they will sway back into the water when they splash out of the water and rise to a certain height. When the pot water is continuously evaporated and concentrated, the salt concentration of the pot water gradually increases. The surface tension of the pot water is also increasing, and a large amount of foam layer is generated on the surface of the pot boiling water. As the pot water concentration increases, the thickness of the bubbles also increases. The effective space of the drum is reduced, and the fine water droplets splashed when the bubble bursts are easily carried out by the upward flowing steam, which deteriorates the quality of the steam. In severe cases, the steam and water coexist, and a large amount of Pot of water. If the steam boiler load increases, that is, the amount of steam per hour through the unit steam space in the boiler increases, the rising speed of the steam in the drum increases, and there is enough energy to bring out the highly dispersed water droplets on the water surface. To deteriorate the steam quality, especially when the load is fluctuating or overloaded, even if the salt concentration of the pot water is not large, the serious consequences of the soda water will occur. When the water level of the steam boiler is too high, the steam space of the drum will shrink, and the amount of steam passing through the corresponding unit volume will increase. The steam flow rate will increase, and the free separation space of the water droplets will shrink, which will cause the water droplets to be carried out with the steam. It will also deteriorate the steam quality, and the fluctuation of the water level will cause the steam to bring water instantaneously. When the pressure of the steam boiler drops suddenly, the volume of steam of the same mass increases, and the volume of steam passing through the volume per unit volume increases. In this way, fine water droplets are also easily taken out, which affects the quality of the steam. * p; ily: '宋体'; background: rgb(255,255,255); mso-shading:rgb(255,255,255); " >Boiler explosion accident prevention When designing the boiler, the thermal calculation and strength calculation shall be carried out in strict accordance with the requirements of GB50041-1992 "Boiler House Design Code". The structural arrangement shall be reasonable and the material selection shall be qualified. When manufacturing the boiler, it shall be constructed according to the drawings to ensure that the boiler quality meets the national standard. The safety accessories on the boiler shall be complete, sensitive and reliable, and shall be inspected regularly and frequently. The accessories that fail shall be replaced in time. The boiler inspection department shall inspect the inside and outside of the boiler regularly, and repair and modify the existing problems in time. Ensure the quality of maintenance. The user should strictly abide by the boiler management system, supervision and inspection system and safety operation procedures. Strengthen the training and training of staff to ensure safe operation. The boiler users should have records of boiler operation, water quality testing, maintenance, inspection, etc. The personnel strictly abide by the post responsibility system and safe operation procedures, and strive to improve the level of operation technology and troubleshooting. Before the boiler is in the furnace, carefully check whether the gas path and oil path are tight (leakage), whether the pressure is normal, and the newly installed and modified oil and gas pipeline must be cleaned. Check whether the blasting fan has been ventilated for 5-10 minutes before ignition. After the analysis of the reasons, and then according to the ignition program ventilation and ignition. For boilers that have not been used for boiler use certificates and annual inspection certificates, the furnace workers have the right to refuse to order furnaces. Enterprises should arrange experienced furnaces with furnace operation certificates. The inspection should be strengthened, and problems should be dealt with in a timely manner to prevent flameout. Once the flameout is found, the fuel should be cut off immediately. The boiler should be equipped with self-control protection devices, including automatic ignition, flameout protection, automatic combustion adjustment and necessary interlocking alarm protection devices. Fully relying on the automatic control device, we must also strictly monitor various instruments and combustion conditions, comprehensive analysis and timely detection of problems, timely processing, in order to avoid accidents.
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