MVR is the abbreviation of mechanical vapor recompression technology (mechanical vapor recompression). MVR is an energy-saving technology that reuses the energy of the secondary steam generated by itself, thereby reducing the demand for external energy.
The principle is to compress the secondary steam produced by the evaporator through a compressor to increase its pressure and temperature, and the enthalpy of the steam will increase accordingly. The steam with increased enthalpy is sent to the heating chamber of the evaporator as heating steam Use, make the material liquid maintain the boiling state, and the heating steam itself condenses into water, so that the latent heat in the secondary steam is fully utilized, thus achieving the purpose of energy saving.
In recent years, this technology has been applied to various industries such as chemical industry, pharmaceuticals, papermaking, sewage treatment, seawater desalination, etc. abroad. Its working process is to compress low-grade secondary steam through a compressor, and the temperature and pressure are increased. The enthalpy increases, and then enters the heat exchanger to heat and condense to make full use of the latent heat of steam.
2. Current operating status of steam compressors:
The ACS510 product was used before the site, and it was damaged for some reason, which caused the production line of the treatment plant to be in a state of suspension.
Three, steam compressor flow demand analysis:
The compressor is in the secondary compression pipeline, and the steam needs to be re-pressurized to 0.7mpa. Therefore, the speed of the compressor is relatively high, which needs to reach about 2650rpm. The load current when driven by ACS510 is about 530-550A. There is no one-way valve at the rear of the machine, no need to consider the balance pressure output torque, the turbine shaft has an independent oil-liquid cooling system, the motor is a three-phase 380VAC asynchronous motor, rated 50HZ/315KW/2978RPM/563A.
Third, the advantages of using easy-drive GT200 inverter
1. Large starting torque, normal starting at full load;
2. High, medium and low speeds in the whole process, stable speed;
3. No stall or no flow during acceleration and deceleration;
4. Wide speed range (0-550HZ arbitrary adjustment);
5. The low-frequency starting torque is large enough to start the fan smoothly;
6. The parameter setting is simple, the default V/F can meet the production needs;
7. Install protective cover, with strong environmental adaptability;
Four, scene pictures
Five, concluding remarks
Easydrive GT200 inverter has been successfully applied to steam turbochargers in sewage treatment plants. Its superior performance (large low-frequency torque, wide speed range, high steady-state accuracy, flexible and convenient operation, and full functional protection) and high Reliability has been praised by customers, and it fully meets the process requirements of sewage treatment plants.