Structural characteristics
The equipment of the heat recovery device is the primary steam - gas heat recovery, the structural type of the primary steam - gas heat recovery is indirect tubular heat exchanger, the frame is carbon steel skeleton, the tube plate is stainless steel plate, the tube is Φ38 rust-proof aluminum tube or stainless steel tube (when the temperature is high), the tube plate and the vertical tube are connected by expanding tube structure, and the built-in automatic timing spray device. The equipment has the characteristics of anti-corrosion, anti-long-term operation of paper wool clogging, easy maintenance and cleaning, etc. : The equipment wet and hot air pipeline, fresh air shell, coupled with fresh air transverse scouring heat exchange tube, has the characteristics of high heat recovery efficiency.
Installation requirements
1. In order to ensure the normal operation of the equipment, it is necessary to ensure the levelness of the equipment installation, which should generally be controlled within 1%, in order to ensure the equilibrium of the force at the connection between the primary steam and gas heat recovery heat exchange tube and the tube plate, and not to local force damage; The second is to ensure the uniform distribution of spray water; The third is to prevent the drift of condensate in the condensation process, which affects the heat transfer efficiency.
2. Ensure that the sealing of each flange connection surface is reliable to avoid leakage at the connection with the system pipeline.
3. Do a good job of external insulation. According to the local climate, select the insulation material, calculate and determine the thickness of the insulation layer to prevent heat loss or freezing equipment, such as the local temperature is high can not use insulation.
4. During the installation of the spray pipe, foreign matter should be prevented from entering the pipe to avoid blocking the spray nozzle and the control valve body.
5. Spray automatic control equipment should be installed in the part that is not damp and anti-freezing to ensure long-term normal operation.
6. A fresh air filter needs to be installed for steam and gas heat recovery, and the filter should be a filter with higher filtration efficiency to prevent pollution of the surface of the heat exchange tube and ensure the cleanliness of the air supply.
7. When the weight of the pipe connected with the heat recovery is greater than 300Kg, it shall not be directly borne by the heat recovery to prevent deformation.
Use requirement
1. The primary steam - gas heat recovery should use cleaner tap water as spray water to prevent pollution of the pipe and blockage of the nozzle. The water pressure should be about 0.3MPa to ensure the spray flushing effect. It is usually sprayed every 8 hours.
2. Primary steam - gas heat recovery fresh air filter according to the local environmental conditions, regular cleaning or replacement, generally no more than seven days should be cleaned once, to reduce air inlet resistance, purify the air.
3. The spray system should have reliable insulation measures, when the temperature is below 0 ° C and the paper machine stops running, it is necessary to do a good job of anti-freezing work, and often check the integrity of the automatic water discharge solenoid valve.
4. When the heat recovery is used normally, it should be inspected once every quarter.
Shandong Fengxin Technology Development Co., Ltd. is a company specializing in the development, research and production of paper ventilation, drying, energy saving technology and equipment, and has achieved good results in the field of paper ventilation, drying and energy saving for many years. Fengxin closed air hood system design mainly includes the drying part closed air hood, air hood in various functions of the blower, waste heat recovery device, paper machine mesh moisture, high-speed Yanke hot air hood, all kinds of coating drying boxes, workshop ventilation system and supporting equipment.