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Heat recovery device for whitening and defogging exhaust gas from paper mill drying

The exhaust gas generated by paper mills during the production process has the characteristics of high temperature, high humidity, and foul odor. If directly discharged, it not only pollutes the environment but also wastes a large amount of heat energy. To solve this problem, our company has developed a whitening and defogging heat recovery device for drying waste gas in paper mills.

Heat recovery device for whitening and defogging exhaust gas from paper mill drying
working principle:
Heat exchange principle: Using the principle of plate heat exchangers, heat is exchanged through a series of parallel metal plates. High temperature exhaust gas flows through one side of the plate, while fresh air flows through the other side, transferring heat through the plate wall to achieve waste heat recovery.
Cooling and heating process: Firstly, the high-temperature exhaust gas is cooled to a temperature close to the ambient temperature, and then heated by a reheater to make the exhaust gas temperature higher than the ambient temperature, thereby eliminating the phenomenon of white mist.
Technical advantages:
Efficient and energy-saving: By recovering waste heat from exhaust gas, energy consumption and operating costs are significantly reduced.
Environmental protection and emission reduction: effectively removing moisture and odorous components from exhaust gas, reducing pollution to the environment.
Compact structure: small size, light weight, easy installation, and occupies less space.
Application scenarios:
Paper industry: Recovering heat during the paper drying process to preheat the air entering the dryer, improve drying efficiency, and reduce fuel consumption.
Food processing industry: Recycling waste heat from the drying process of grains, vegetables, fruits, etc., to preheat fresh air and improve drying efficiency.
Chemical industry: Recycling high-temperature waste gas from the drying process of chemical products for heating other process gases or air.
Textile industry: used for the recovery of waste heat during the drying process of textiles, improving drying efficiency and energy-saving effects.

Heat pump drying heat recovery energy saving system

With the further development of China's economy, the use of green energy will be more and more extensive. Heat pump dehumidification dryers with plate type obvious heat recovery function have developed rapidly in recent years and have been widely used in the Yangtze River basin, southwest China and South China.

The unit using the inverse cano principle at the same time, combined with efficient heat recovery technology, in the whole drying dehumidifying process, through the duct the wet air within the chamber connected to the host using the sensible heat plate heat collector recovery of the sensible heat and latent heat of hot and humid air, thermal recycling, greatly improve the performance of the host, improve the drying speed and material quality. The waste heat can not only improve the performance of the unit, but also reduce the thermal pollution to the environment and alleviate the urban heat island effect.

The heat pump drying heat recovery system is not only used in the mud drying system, but also widely used in many other drying industries. It has the characteristics of good drying quality and high degree of automation, and is the best choice product for energy saving, green and environmental protection in the modern drying industry.

Heat pump dryers with and without heat recovery working principle

When the heat pump dryer dries the air, the air forms a closed cycle between the drying chamber and the equipment. The evaporator's heat absorption function is used to cool and dehumidify the hot and humid air, and the condenser's heat release function is used to heat the dry cold air, so as to achieve the effect of cycle dehumidification and drying.

The main difference between heat recovery function and heat pump dryers without heat recovery function lies in the different air circulation modes. The former is equipped with plate type sensible heat exchanger, which plays the function of pre-cooling and preheating in the air circulation process, reducing the load of compressor operation and achieving the purpose of energy saving.

Heat pump drying heat recovery energy saving system(图1)

Heat pump drying system operation mode

Heat pump drying heat recovery energy saving system(图2)

Energy saving analysis of heat recovery

Taking a heat pump dryer as an example, the air temperature of drying is designed to be 65℃, the relative humidity is 30%, the circulating air temperature is 65℃, the temperature before passing through the evaporator is 65℃, and the temperature after evaporation cooling is 35℃. The condenser needs to heat the air of 35℃ to 65℃ before it can be used.

After matching with BXB500-400-3.5 heat exchanger, 35℃ return air absorbs heat from exhaust air after passing through plate heat exchanger, and the temperature rises to 46.6℃. The condenser only needs to heat the air from 46.6℃ to 65℃ to meet the use requirements, greatly reducing the load of evaporator and condenser, thus reducing the power of the whole machine, achieving the purpose of energy saving.

Energy saving analysis of heat recovery

Heat pump drying heat recovery energy saving system(图3)

Selection and economic calculation

We are very glad to show you the calculation and selection software of plate heat exchanger jointly developed by us and Tsinghua University. If you need, please contact us!

A rapid method for eliminating white smoke

The principle of using a condenser for dehumidification to eliminate white smoke is mainly based on the physical changes of water vapor in the flue gas. The condenser cools the flue gas with low-temperature water or air, gradually reducing its temperature, and the water vapor inside begins to condense into small water droplets. These small water droplets gather inside the condenser and eventually form liquid water, which is then removed through drainage pipes. Dehumidification through a condenser is an effective technical means to eliminate white smoke. It can not only reduce visual pollution, but also help improve the operational efficiency and energy-saving effect of environmental protection equipment. We can provide you with a suitable dehumidification solution for flue gas, which is both economical and environmentally friendly. Welcome to consult us via email.

Efficient equipment for removing industrial flue gas

Industrial flue gas desulfurization equipment with heat exchange technology to reduce the water vapor content in flue gas, thereby eliminating the white smoke plume generated during chimney emissions. The following are several common methods for flue gas whitening:

Flue gas heating technology: The desulfurized wet flue gas is heat exchanged with industrial high-temperature flue gas through a heat exchanger to increase the emission temperature of the flue gas, thereby reducing the relative humidity of the flue gas and avoiding the condensation of water vapor to form white smoke. This method can effectively reduce the generation of white smoke, but it requires a certain amount of energy to heat the smoke.

Flue gas condensation technology: First, partially condense the water vapor in the saturated flue gas, and then heat the flue gas. This method reduces the formation of white smoke by lowering the moisture content in the flue gas, while also recovering some water resources.

MGGH technology: Install flue gas cooling heat exchangers before and after electrostatic precipitator, install flue gas heating heat exchangers after desulfurization, and set up a heat medium water circulation system. This technology extracts the heat from the original smoke to heat the clean smoke, which usually needs to be raised to 75-80 ℃ to avoid the production of white smoke.

In summary, these methods each have their own advantages and disadvantages, and are suitable for different industrial environments and needs. When selecting specific flue gas desulfurization technologies, factors such as process conditions, waste heat resources, and investment requirements need to be considered. Welcome to consult us via email.

Smoke Scrubber :Efficient removal of white smoke with physical methods

The smoke scrubber condenses water vapor in the flue gas into liquid through a condenser, and gas pollutants adhere to the condensed liquid before being discharged through exhaust gas. This technology does not require a collector, but relies on the precipitated liquid to carry away pollutants, thereby reducing operating costs and minimizing the environmental pollution caused by white smoke.

The white smoke removal equipment produced by our company has a compact design layout, flexible installation, and easy operation, which can efficiently and quickly solve the white smoke generated in industrial production. Mainly used for desulfurization and whitening of flue gas from coal-fired boilers, gas-fired boilers, power plants, metallurgy and other industries.

Energy saving devices for heat dissipation in computer rooms

The heat exchange core of the computer room's heat dissipation energy-saving device is an efficient heat dissipation solution specifically designed for data centers or server rooms. By optimizing heat exchange efficiency, energy consumption can be reduced and system performance can be improved. The heat exchanger produced by our company uses hydrophilic aluminum foil as the heat exchange material, and the surface has been specially treated to have excellent hydrophilicity, which can promote the rapid formation and removal of condensed water. During the heat exchange process, the hydrophilic layer can effectively increase the heat exchange area and improve the heat exchange efficiency. Adopting a multi-layer microchannel design increases the contact area between the fluid and the metal wall, thereby improving the heat transfer efficiency. Greatly improved the energy efficiency ratio of data centers and reduced operating costs.

Comparison of PUE for Data Center Cooling Technologies

PUE (Power Usage Effectiveness) is an important indicator for measuring energy efficiency in data centers. Ideally, the closer the PUE value is to 1, the higher the energy utilization efficiency. The following are typical PUE value ranges for various cooling technologies:

冷却技术	典型PUE值	适用场景

传统风冷

1.7 - 2.5

中小型数据中心、气候炎热地区

热/冷通道隔离

1.3 - 1.6

大型数据中心

间接蒸发冷却

1.1 - 1.3

干燥地区、节能要求高的数据中心

冷冻水系统

1.2 - 1.5

高密度负载

浸没式液冷

1.05 - 1.2

高性能计算（HPC）、超高热密度场景

自由冷却

1.1 - 1.3

寒冷地区

热回收冷却

1.2 - 1.4

热能循环利用需求高的数据中心

AI智能温控

1.1 - 1.2

超大规模数据中心

Design of Drying, Dehumidification and Heat Recovery System

With the rapid development of manufacturing industry, many products require drying and dehumidification treatment during the production process. These processes not only require efficient moisture removal, but also require maintaining the characteristics and quality of the material. Traditional drying and dehumidification methods often consume high energy and may have adverse effects on the environment, such as emitting greenhouse gases and other pollutants.

By adopting efficient heat recovery technology, waste heat can be maximally recovered and reused to reduce energy consumption. Heat recovery technology has been widely applied in multiple industries to improve energy efficiency and reduce operating costs. But in the field of drying and dehumidification, the potential of this technology has not been fully tapped. We customize and develop a heat recovery system that suits your specific production needs and on-site conditions. We carefully design the system layout for you to ensure minimal loss of thermal energy during conversion and transmission. Welcome to inquire via email.

Heat recovery technology for air conditioning systems in shopping malls

In today's pursuit of high-quality shopping experience, we not only focus on the richness and diversity of products, but also care about the comfort and sustainability of the shopping environment.
The core of our company's air conditioning system heat recovery technology lies in the perfect combination of high-efficiency heat exchanger design and intelligent control system. It can efficiently collect the waste heat generated during the operation of air conditioning and convert it into valuable energy for winter heating, domestic hot water, and even pre cooling fresh air in shopping malls.
This process does not require additional energy consumption and can achieve internal energy recycling, significantly reducing the overall energy consumption cost of the mall. And it can automatically adjust the operating status and heat recovery intensity of the air conditioner. This means that whether it's scorching summer or cold winter, the mall can ensure constant temperature and humidity, providing customers with the most comfortable shopping environment while achieving the best energy-saving effect. Welcome to consult via email.

Energy saving scheme for heat recovery of central air conditioning system

In the operation of central air conditioning systems, we can adopt high-efficiency heat exchangers for energy-saving renovation plans, and can choose plate heat exchangers or microchannel heat exchangers with high heat transfer efficiency and low fluid resistance. Our heat exchanger has a larger heat transfer area and more efficient heat transfer performance, which can reduce energy consumption under the same heat transfer conditions. Install a waste heat recovery device in the central air conditioning system to recover and reuse the emitted heat. It can also be combined with heat pump technology, which is an efficient way of transferring heat energy by consuming a small amount of electricity or fuel energy to transfer the heat from a low-temperature heat source to a high-temperature heat source. The application of heat pump technology in central air conditioning systems can improve the coefficient of performance (COP) of the system and reduce energy consumption.

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