Steel drum post-processing equipment---painting drying curing equipment
Research on double bridge oven and curing furnace
Xi'an Machinery Research Institute Ma Rungang Hou Bin
I. Introduction:
In recent years, the state has vigorously promoted the development model of circular economy and advocated the establishment of a resource-saving society. One is to use resources efficiently and recycle as the core, with low consumption, low emission and high efficiency, in order to effectively use resources and environment. A new economic development model based on protection is on the rise. Steel drum manufacturers are also demanding energy conservation and emission reduction to reduce costs. To this end, we have strengthened the research and development of steel drum drying and curing equipment and achieved success. This year, two users in the country have used the new double-bridge oven and curing oven designed and manufactured by our company. They use coal as fuel, which is easy to use and has obvious energy-saving effect. It has been well received by all parties.
Our institute is a scientific research unit affiliated to Xi'an Science and Technology Bureau. It mainly conducts research and development of steel barrel production equipment. It is a national steel barrel manufacturing equipment manufacturer and a member of China Packaging Association. It has a whole production line of steel drums (front and middle sections). And the latter part of the design and manufacturing capabilities, long-term commitment to steel barrel equipment, technology and process research and development, a number of technologies in the industry to take the lead.
Second, the existing drying and curing equipment problems:
The post-processing of the steel drum is to be phosphatized, cleaned, then dried, sprayed, and then cured. Therefore, the oven and curing oven become the key equipment in the post-processing of steel drums.
The traditional oven has a large area of ​​the curing furnace and high equipment cost. The fuel is made of electricity, oil, natural gas, etc. The energy consumption is high, the maintenance cost is high, and the production cost is large. There are many mechanical transmission links and many fault points.
In recent years, we have studied industrial ovens in other industries, and combined with the characteristics of the steel barrel manufacturing industry, designed and developed double-bridge ovens and curing ovens. Through the use of several steel barrel factories, it has the characteristics of reliable transmission, energy saving, small floor space and low production cost.
Third, double bridge oven, curing furnace structure and production process:
The structure is shown in Figure 1 (see Figure 1):
1. Bridge body. 2. Transducer. 3. Ashing port. 4. Coal burning furnace. 5. Collecting heat dust collector. 6. Induced draft fan. 7. Suspended conveyor chain.
production process:
After the coal-fired furnace is ignited, the dry air in the heat pipe of the transducer is heated. Under the action of the induced draft fan, the heated airflow circulates in the tube, and the heat is radiated through the surface of the heat pipe, and the temperature inside the bridge box rises rapidly. A temperature control device is arranged in the bridge box, and the induced draft fan is automatically turned off when the required temperature is reached. Since the transducer is built-in, the heat it dissipates is in the furnace, maximizing the use of energy.
Fourth, the mechanism:
In the drying process, since the specific gravity of the hot gas flow is small, the air is floated, and the moisture is more important, and the sinking is automatically discharged from the outlets at both ends of the double bridge.
The temperature rises quickly, from ignition to the desired temperature in about 30 minutes. The heat preservation performance is good, because the heat flow has a small specific gravity, floats up, is stored in the bridge box, and does not overflow, so the loss is small. After the production is completed, the fire source is sealed. When the machine is turned on the next day, the temperature in the furnace is only reduced by about 20 to 30 °C.
The volume of the bridge box is determined according to the production capacity. The design thermal power is calculated according to 2500 kcal/M3 and the highest temperature is 300 °C.
Since the types of coatings used by the various steel drum manufacturers are different, the temperature setting in the furnace is also different and can only be determined during the production process. If pure drying, the northern region can be controlled at around 100 °C in summer, and the curing is 182 ° C according to the general standard, 40 minutes of baking conditions, or can be cured at 225 ° C for 10-15 minutes.
Under normal conditions (steel barrel production capacity: 4-5 pieces / minute), the total thermal power is designed to be approximately:
Drying oven: 6-10 million kcal / hour
Curing oven: 30-40 million kcal / hour
Air flow in the pipeline: 5000-7000M3/hour
Wind pressure: 700-900Pa
Transmission: Suspension conveyor chain, pitch t=200mm, single point hoisting weight 32kg, power 2.2KW (chain length 120m), frequency control. Flexible layout (if necessary, the workpiece can be transported to any station in principle, and can be turned multiple times).
As shown in Figure 2 (see Figure 2), it is a three-rail bridge type curing furnace designed for another steel drum factory. It has the characteristics of small power and long transmission distance. It is widely used in other industries such as automobile manufacturing and is a mature technology. The steel drum is hung on the hanging chain by the hanger, the opening is upward, and the steel drum runs downward at the exit, the hot air in the bucket floats up, and returns to the bridge box, which greatly reduces the steel drum running out. Heat. The traditional opening downward operation method, the hot air filled in the steel barrel can not overflow, in the case of 200L steel drum, 200L hot air is taken out every barrel, the heat loss can be imagined, the chain link adopts self Walking lubrication is simple and convenient.
Exhaust gas temperature: Generally speaking, the exhaust gas temperature is greater than the temperature inside the bridge box, reaching 200-300 °C. Otherwise, the flue gas will bring out the heat in the bridge box. For this reason, we set up a heat collecting box at the exit, and use the waste heat of the flue gas to heat the circulating water in the tank, and this part of the hot water can be used to supply the degreasing liquid tank or use Come for the workers to take a shower. This allows the flue gas to be controlled below 150 °C, making full use of energy.
Smoke and dust removal: A dust box is installed in the bridge box, a water film dust removal mechanism is installed at the exit, and no black smoke is emitted. The indicators such as Ringermann blackness meet the requirements of the environmental protection department.
Furnace body: The furnace body is built with refractory bricks, plus insulation layer. The double furnace is used, and the secondary air is added to make the coal combustion fully burnt.
V. Economic benefits:
The standard coal is calculated according to 5000 kcal/kg. A 300,000-kilometer double-bridge curing furnace consumes about 50 kg/hour of coal per hour. The price of bituminous coal in Xi'an is about 400 yuan/ton, which is about 20 yuan/hour. The fuel cost of many steel drum factories in the region is more than 200 yuan / hour, the difference between the two costs is 10 times, the economic benefits of coal-fired double-bridge curing furnace is significant.
Sixth, our recommendations:
In view of the requirements for environmental protection and energy conservation, it is recommended to invest a certain amount of capital and manpower in the enterprises of this industry to carry out the necessary transformation of the oven and the curing furnace in the steel barrel post-processing equipment to achieve energy saving and cost reduction. Newly-built enterprises pay attention to this technology when they are in the initial selection of production lines, so as to avoid the waste of energy and increase the cost of the old road.
Steel drum enterprise experts and leaders are welcome to visit our institute to discuss new processes and new technical issues in steel barrel post-processing equipment.
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