Mechanical steam recompression system and control method

Abstract

The invention provides a mechanical steam recompression system comprising an evaporative condenser, a centrifugal compressor, a screw compressor, an electric water heater, a vapor-liquid separator and a fresh water box. The evaporative condenser communicates with the centrifugal compressor and the screw compressor; a first valve and a drain separator are arranged between the evaporative condenser and the centrifugal compressor; a second valve is arranged between the evaporative condenser and the screw compressor; the centrifugal compressor communicates with the screw compressor; an outlet of the screw compressor communicates with the an inlet of the screw compressor; and the screw compressor communicates with a condensing tube of the evaporative condenser through the vapor-liquid separator. The mechanical steam recompressing system provided by the invention is a mechanical steam recompressing system which has no need to start heat-source steam, can realize a high vapor pressure ratio (Saturated temperature rise of compressed steam) and high vapor flow, and has higher energy efficiency. In addition the mechanical steam recompression system has functions of expanding the application range of conventional mechanical steam recompression systems and realizing industrial energy conservation.

Description

technical field [0001] The invention relates to a mechanical steam recompression system and a control method, belonging to the field of recovery and utilization of low-temperature steam waste heat in industrial distillation concentration and heating engineering. Background technique [0002] The global energy problem is becoming more and more prominent. my country's energy consumption is high but the energy utilization rate is low. It is urgent to carry out energy-saving transformation in energy-intensive industrial fields. Mechanical steam recompression technology uses the principle of heat pump to recover the waste heat of low-temperature steam, and uses mechanical compressor to compress steam, which can provide heat source steam that can replace boiler steam, and can be widely used in printing and dyeing, sewage treatment, seawater desalination, chemical distillation and other industries field. Studies have shown that the energy consumption of using a compressor to incre...

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Problems solved by technology

Generally, the heat source steam used for start-up is boiler steam, which consumes a lot of energy and increases the cost of the system.

[0005] Generally, the centrifugal compressor can achieve a large volume flow, but because of its sensitivity to liquid droplets and the surge problem of small flow, the adaptability is poor, and the operating pressure ratio should not be too high

The screw compressor, because of its liquid resistance, can realize the high pressure ratio and low exhaust temperature of vapor compression through the way of water spray cooling of the working volume, but it is only suitable for medium and low volume flow

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