Waste gas heat recovery system for biological processors — Application of gas-to-gas heat exchangers
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I. Project Overview: A biological treatment unit is a specialized device that uses aerobic microorganisms for waste treatment. It takes advantage of these microorganisms to rapidly decompose food waste, which is of great significance for environmental protection in cities; it belongs to the category of environmental protection equipment. Microorganisms require a suitable living environment, and proper control of the temperature is an important condition for their viability. The objectives of this project are: 1. To design appropriate heating equipment. 2. Recover the waste heat emitted to reduce heat loss. 3. Condense some of the moisture to reduce its release into the air. 4. Make better use of waste heat recovery to achieve energy savings and temperature control. II. Design Scheme 1. Data Collection (1) The heating temperature of the U-shaped channel must reach 80°C. (2) The air intake and exhaust volume of the equipment is 1680 m3/h. The exhaust temperature is around 30°C, with a variation of 5°C depending on the inlet air temperature. (3) Ambient temperature, 15°C~25°C. 2. Process principle: Based on calculations, for an air flow rate of 1680 m3/h, an increase in temperature from the fresh air temperature to the exhaust air temperature of 5°C results in a heat removal rate of approximately 1.63 KW. It can be seen that exhaust ventilation is the key pathway for heat loss. Recovering the residual heat from the exhaust air, as well as cooling and dehumidifying it, is the core of the design. The exhaust heat recovery device utilizing new technology directly uses exhaust gas to heat fresh air, featuring high heat exchange efficiency and complete heat recovery, with no additional energy consumption. 3. Process flow diagram III. Performance curves of high-efficiency gas-to-gas heat exchangers IV. Analysis of energy-saving effects V. Equipment appearance VI. Equipment on-site
The promoter post was posted more than once by the original poster. I had doubts as soon as I read it before. 1. Air-source heat pumps see a significant change in their energy efficiency ratio as the ambient temperature changes; it is much worse at night than during the day. The lower the ambient temperature, the relatively lower the heating efficiency, which can even drop to 1/4. The current testing relies only on the periods during the day when the temperature is higher, namely from 9:00 to 16:00, in order to calculate an average for the entire 24-hour day; this approach doesn’t seem very convincing. 2. The odor from kitchen waste should be treated using adsorption or photolytic oxidation, as shown in the diagram; the odor contains large amounts of NH3, H2S, CH3SH, VFAs, and VOCs, of which only a portion can be absorbed or decomposed. So are the remaining harmful gases released directly? How are the environmental testing results? 3. The wastewater generated from kitchen waste is a more serious pollutant; it contains a high amount of organic matter, which fosters the growth of various viruses. The oily portion inside has a more pronounced impact on the pipes and heat exchange. Direct sequencing is also not allowed. Float it again later? 4. Is it 25-30°C in Wuhan in April? It still relates to the ambient temperature; how is it applicable in the north?
5. Piled-up kitchen waste easily produces methane, and there have been many similar explosion accidents across the country. It is recommended to implement additional safety measures for the equipment. 6. In this mode of operation, kitchen waste is generally disposed of on-site where it is generated. In such cases, **strict regulations apply; it’s not possible to dispose of the waste just as one wishes. Approval procedures must be carried out step by step, from the local district level up to the city level, and a person responsible for ensuring safety must be designated, with reports to be submitted on a monthly basis.
It is possible to display the hot air temperature corresponding to the energy-saving effect analysis chart
Thank you very much for your reply and for asking these questions. I’m sorry, but I’m unable to answer them; what we manufacture are only heat recovery devices that exchange heat between the exhaust gases produced by biological treatment units and air. We don’t know much about anything else, and there is room for improvement on our part
Thank you for your reply; we will provide more detailed data statistics in the future