1. Introduction to boiler structure
Zhongrui steam boiler is an electromechanical integration equipment, which consists of boiler body, burner, electric control cabinet, feed water pump and pipeline valve instrument. The unit is equipped with imported European burners. The unit body adopts the horizontal internal combustion three-return wet-back type of mature structure. The fuel (oil/gas) is sprayed from the burner through the pressure atomization at high speed, and it is slightly positive in the furnace. Compressed combustion, the high-temperature flue gas after combustion is turned into the second return pipe to the front smoke box after the radiation heat exchange in the furnace, and then turned 180o degrees into the third return pipe, and then discharged through the rear smoke box and the condenser. The chimney enters the atmosphere.
2. Boiler body technology advantages
In the layout of the convective heat transfer pipe area, the traditional two- and three-return "equal flow rate" design viewpoint was abandoned, and the "equal resistance" design new idea was used to arrange the convective heat transfer surface, which broke through the design of the furnace The traditional design idea of the diameter of the flame to determine the diameter of the furnace is to use a large corrugated furnace structure, greatly increase the radiation heat transfer area, and reduce the NOx emissions. The threaded pipe technology is applied in the convective heat transfer pipe section, and the boiler efficiency reaches over 96.2%, which greatly improves the boiler efficiency. The smoke box adopts a double-sealed small smoke chamber structure to prevent smoke leakage, which is convenient for the user to repair. The heat preservation adopts aluminum silicate fiber felt, and the heat preservation effect is good. Since we have done a lot of work in combustion and heat transfer, we have adopted some new structures and new technologies, which have greatly reduced the size of the product, reduced the space occupied by the machine room, and reduced the weight.
3. Introduction to the characteristics of the boiler
High security and reliability
The boiler combustion chamber adopts corrugated furnace and has good thermal expansion performance. The combustion chamber is equipped with an explosion-proof door. The furnace body is equipped with high-sensitivity temperature, pressure and water level sensor components. The controller constitutes a high-reliability multiple safety protection control system. Ensure the safe operation of the boiler; the boiler has a large volume of water, stable and reliable operation, and high heat supply quality.
The boiler adopts a large furnace and a corrugated furnace structure, which increases the radiation heat transfer area and facilitates the full combustion of the fuel. The artificial neural network-based fuzzy control technology and the world famous brand burner are used to realize the automatic adjustment of combustion according to temperature and pressure, so that the boiler can operate efficiently and economically under different conditions, and the fuel consumption is minimized. .
Conducive to environmental protection
The low NOX combustion technology is used to optimize the boiler structure design, and the boiler combustion condition is automatically adjusted through the flue gas detection, thereby ensuring that the boiler flue gas emission meets the requirements of environmental protection in China and the world, and the running noise is low.
Easy installation and maintenance
The front and rear smoke boxes of the boiler adopt movable double sealing structure, which is convenient for inspection, maintenance and cleaning of the boiler interior. The whole boiler is fast installed, no vibration is running, and the installation is convenient and quick. The boiler computer controller can automatically record the time and cause of the fault, which is convenient. Maintenance personnel perform maintenance.
In a conventional boiler, after the fuel is burned in the boiler, the exhaust gas temperature is relatively high, and the water vapor in the flue gas is still in a gaseous state, which will take away a large amount of heat. Among all kinds of fossil fuels, natural gas has the highest hydrogen content, and the mass percentage of hydrogen is about 20% to 25%. Therefore, the exhaust gas contains a large amount of water vapor. It is estimated that the steam generated by burning 1m3 of natural gas should be taken away. The heat is about 4000KJ, which is about 10% of its high calorific value.
The flue gas condensation waste heat recovery device uses the lower temperature water or air to cool the flue gas to reduce the flue gas temperature, close to the heat exchange surface area, and the water vapor in the flue gas condenses, and at the same time realize the sensible heat release of the flue gas and the latent heat of steam condensation. Released, while the water or air in the heat exchanger absorbs heat and is heated to achieve heat recovery and improve boiler thermal efficiency.
Increased boiler thermal efficiency: The theoretical flue gas production of 1NM3 gas combustion is about 10.3 NM3 (about 12.5KG). Taking the excess air ratio of 1.3 as an example, a flue gas of 14 NM3 (about 16.6 KG) is produced. Take the flue gas temperature 200 ° C to 70 ° C, release physical sensible heat about 1600KJ, water vapor condensation rate of 50%, release vaporization latent heat of about 1850 KJ, a total exotherm 3450 KJ, about 10% of the natural gas low heat. If 80% of the flue gas enters the heat recovery unit, the heat energy utilization rate can be increased by 8% or more, and the natural gas fuel can be saved by nearly 10%.
Separate layout, various installation forms, flexible and reliable.
As a hot surface, the spiral finned tube has high heat exchange efficiency, sufficient heating surface, and low resistance of the flue gas side system, which meets the requirements of ordinary burners.
Comparison of operating costs:
Compared with other types of boilers, horizontal steam boilers equipped with flue gas economizers provide the same heat supply because of their high thermal efficiency, which is very economical. When comparing with a conventional horizontal steam boiler (smokeless energy saver), the energy saving of the entire system should be considered. The thermal efficiency of a horizontal steam boiler includes an economizer. The efficiency of a common horizontal steam boiler is 90%, and the gas consumption of a 600,000 kcal/h (commonly known as lt) boiler is:
The horizontal steam boiler installation economizer is installed at the tail of the boiler flue, fully absorbing the heat loss of the flue gas, the system is simple, and the exhaust gas temperature can be reduced to less than 100 °C. The air consumption of a horizontal steam boiler with a 600,000-calorie installation of energy-saving devices is: 600000/8500/96%=73 (m3/h)
It consumes less gas (m3/h) than ordinary horizontal steam boilers, such as using 2400h per year to save gas:
If the gas price is 2.5 yuan / m3, the annual savings:
12000m3 × 2.5 yuan / m3 = 30,000 yuan.
It provides production steam for food processing, printing and dyeing, pharmaceutical and other industries, provides disinfection steam for medical institutions, provides steam for heating of other enterprises and hotels, and provides domestic water through water tank heating.