Distillation column MVR Heat Pump Energy Saving renovation

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Distillation column MVR Heat Pump Energy Saving renovation

Distillation column MVR Heat Pump Energy Saving renovation

Separation of components with similar boiling points; Large consumption and high price of steam and circulating water; Widely used in the recovery, separation and purification of organic solvents such as methanol, ethanol, isopropanol, acetone, acetonitrile, tetrahydrofuran, dichloromethane, ethyl acetate, toluene products.
Overall operating cost savings of more than 35%
Investment return period less than 2 years


environmental protection

Product advantage

AGT, with rich experience in pharmaceutical machinery development and production, has jointly developed with its subsidiary Leheng's MVR steam recompression core technology.
The goal of carbon neutral
This system effectively avoiding the disadvantage of traditional distillation system’s high energy consumption. This system also advantaged in better separation effect and energy-saving to help achieve the goal of carbon neutral.
Save over of total
Energy consumption
save over of steam
save over of steam

Technical principle

Heat pump distillation process

Continuous compression cycle of secondary steam as a heating source

Compressing the low-temperature gas at the outlet through the compressor without condensation, increase the temperature and pressure of the gas, increase the enthalpy value of the gas, and then use it as the heat source of the reboiler to heat the material, making full use of the latent heat of the gas and reducing the production of steam. consumption and circulating water to reduce operating costs.


Indirect steam compression type

The feed mother liquor enters the distillation column after three-stage preheating, and is separated in the distillation tower. The liquid flows from the bottom of the distillation tower into the reboiler. The reboiler is equipped with a coupled reboiler and an auxiliary reboiler. The coupled reboiler is the heat source of the boiler is the high-pressure gas at the outlet of the compressor, and the heat source of the auxiliary reboiler is raw steam. The gas at the top of the distillation tower is compressed by the compressor and becomes high-temperature and high-pressure gas. The high-temperature and high-pressure gas enters the coupled reboiler for heat exchange. After condensation, it is light. The components are partially extracted and partially refluxed, and the heavy components at the bottom of the tower reactor enter the preheater and exchange heat with the feed mother liquor before being discharged.

Tower top steam compression type

A compressor is introduced into the traditional distillation column system. The low-temperature and low-pressure steam at the top of the tower is compressed by the compressor and becomes a high-temperature and high-pressure gas. It then passes through the reboiler as a heat source to heat the material, and the light components are condensed through the reboiler. The condensate is buffered by the buffer tank and then transported by the reflux pump. Part of it is extracted and part of it is refluxed


Customized design

Based on your existing heat pump distillation equipment and operating conditions,

we provide MVR heat pump energy-saving renovation solutions to maximize its energy-saving effect;

Customize different types and pressure ratios of steam compressors according to different

operating conditions and technical requirements in different fields and specific environments.

Centrifugal Steam Compressor
Supporting compressor:Centrifugal Steam Compressor
MVR steam recompression energy-saving technology provided by Leheng, a subsidiary of AGT


we are one of the few evaporator manufacturers in China that has mastered steam power equipment technology.


Leheng with independent research and development property rights in MVR core technology.


Compressors of different categories and models can be flexibly applied to different application scenarios

Customize the design of the compressor impeller according to your requirements to meet stringent performance requirements

Over 30000 hours of operating life

Through high-strength materials, precise processing technology, and strict testing methods, we ensure that the service life of the impeller reaches 30,000 hours.

High strength titanium alloy TC4 carefully forged

The impeller material is forged from high-strength, wear-resistant, and highly corrosion-resistant titanium alloy material, and is precision milled through a five-axis linkage milling machine.

Excellent dynamic balance performance and high standard strength testing

It has passed double-sided dynamic balancing of no less than G1.0 level and an overspeed test of no less than 15% of the working speed to verify its strength.

Strict factory inspection

After each impeller is processed, it undergoes strict factory inspections such as non-destructive testing and three-dimensional testing, providing customers with products that meet quality requirements.



Energy consumption comparison between heat pump distillation and traditional distillation column

A. 2500m ³/ D Ammonia nitrogen wastewater treatment system heat pump renovation project

Renovate the existing deamination tower with a heat pump. The ammonia-containing vapor at the top of the tower enters the falling film evaporator to exchange heat with water. After the heat exchange, the vaporized low-temperature and low-pressure water vapor enters the compressor and becomes high-temperature and high-pressure gas after compression and enters the tower. The kettle coupled reboiler exchanges heat with the tower kettle wastewater to save industrial steam consumption.

Table 1: Parameters of ammonia nitrogen wastewater to be treated
No. Item Unit Value Remark
1 Amount of water m³/d 2500  
2 pH Dimensionless 12~12.8  
3 NH3 g/L 5~10 Calculated by 6
4 Na2SO4 g/L 100~150  
5 Ni、Co、Mn mg/L 100~200 Calculated by 100
6 Temperature 20~60  
7 Cl- mg/L <20  
Table 2: Deamination tower top kettle outlet parameters
Customer parameter requirements Item Unit Value Remark
Ammonia-containing steam at the top outlet of the tower Flow t/h 12.56 To evaporator
Component   Ammonia (20%), water
Temperature 95±5
Pressure kPa 101
High temperature water at the outlet of the tower kettle Flow t/h 107 Reboiler
Component   Water, sodium sulfate (100-150g/L), nickel cobalt manganese hydroxide (150-300mg/L), pH approximately 12
Temperature 105±5
Pressure kPa 101

Energy consumption comparison

Comprehensive field application, the theoretical calculation through the large-scale chemical engineering simulation software Aspen Plus is as follows
Utility Conditions Circulating water 0.2 Yuan/T
Electricity 0.7 kW.h
Steam 250 Yuan/T
 Continuous operation for one year Hour 7920 330 days
Feeding 105m³/h ammonia-containing wastewater, operating cost comparison table
Device Utilities traditional distillation Heat pump distillation
Energy consumption Yuan/H Energy consumption Yuan/H
Reboiler Steam T/H 9 t/h 2250 4 t/h 1000
Condenser Circulating water T/H 904 t/h 180.8 600 t/h 120
Pump Motor KW 20 kw/h 14 90 t/h 63
Compressor Motor KW 0 kw/h 0 670 t/h 469
Total/yuan 2445 1652
 Every 1 ton of wastewater treated Total/yuan 23.3 15.7
One year operating cost/10000 yuan 1936 1308
Annual cost savings/10000 yuan 628
From the comparison in the above table, it can be seen that heat pump distillation saves operating costs of 6.28 million per year. The operating costs are calculated based on the parameters in Table 1 and Table 2 above. Changes in actual operating data will affect the operating costs.

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