Wenshuo Information: Venturi heat pump waste heat and waste pressure recovery technology

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With energy issues becoming increasingly prominent, the efficient use of energy has become key to sustainable development in many industrial sectors. As an innovative energy-saving solution, the venturi heat pump technology for recovering waste heat and pressure is gradually gaining prominence, providing strong support for industries to reduce energy consumption and emissions as well as lower costs. I. Technical Principle The core principle of the Venturi heat pump waste heat and pressure recovery technology is based on the Venturi effect. A venturi tube is a specially designed pipe consisting of a converging section, a throat, and a diverging section. When a high-pressure fluid moving at high speed (such as high-pressure steam) flows through the constricting section of a Venturi tube toward the throat, the flow velocity of the fluid increases sharply. According to Bernoulli’s principle, as the flow velocity increases, the pressure decreases, resulting in a region of negative pressure at the throat. This negative pressure area acts like a powerful \"suction source\" that can draw in the surrounding low-pressure fluids, such as low-temperature condensate or low-pressure steam. During the induction process, the high-pressure fluid mixes thoroughly with the low-pressure fluid; part of the energy from the high-pressure fluid is transferred to the low-pressure fluid, thereby increasing its pressure or causing it to flash and generate more steam. In this way, the waste heat and pressure that would otherwise be released directly and wasted can be recovered and reused, achieving efficient energy conversion. II. Technical Principle The core principle of the Venturi heat pump waste heat and pressure recovery technology is based on the Venturi effect. A venturi tube is a specially designed pipe consisting of a converging section, a throat, and a diverging section. When a high-pressure fluid moving at high speed (such as high-pressure steam) flows through the constricting section of a Venturi tube toward the throat, the flow velocity of the fluid increases sharply. According to Bernoulli’s principle, as the flow velocity increases, the pressure decreases, resulting in a region of negative pressure at the throat. This negative pressure area acts like a powerful \"suction source\" that can draw in the surrounding low-pressure fluids, such as low-temperature condensate or low-pressure steam. During the induction process, the high-pressure fluid mixes thoroughly with the low-pressure fluid; part of the energy from the high-pressure fluid is transferred to the low-pressure fluid, thereby increasing its pressure or causing it to flash and generate more steam. In this way, the waste heat and pressure that would otherwise be released directly and wasted can be recovered and reused, achieving efficient energy conversion. III. Application Areas 1. Petrochemical Industry: In the petrochemical production process, a large amount of steam is consumed, and simultaneously large quantities of condensate water as well as waste gases at certain pressures are generated. Shanghai Chlor-Alkali Chemical has modified the atmospheric pressure condensate hot water tanks in its vinyl chloride plant by adding Venturi devices. Low-pressure steam at 0.8 MPa is injected through a Venturi device to draw in the water vapor from the condensate tank; this not only enables steam recovery but also reduces the steam pressure to 0.2 MPa, meeting the requirements of the unit used for the oxychlorination of ethylene to produce dichloroethane. Each year, approximately 2,000 tons of low-pressure steam at 0.8 MPa can be saved, resulting in cost savings of over 300,000 yuan in terms of low-pressure steam usage, while also reducing the power consumption of the facility. A petrochemical company has applied venturi heat pump technology in its ethanolamine regeneration system, using 1.0 MPa steam as the driving force to recover the flashed steam from the wastewater at 124°C, thereby replacing the conventional temperature and pressure reduction valves. This measure reduces the use of high-pressure steam and lowers the temperature of the hot water discharged, resulting in significant energy savings and helping the company to save a large amount of energy costs each year. 2. Iron and steel industry: Steel production is a energy-intensive process; blast furnace ironmaking and sintering generate large amounts of pressurized gas as well as waste heat. In terms of recovering the residual pressure of blast furnace gas, the Venturi heat pump technology converts the energy contained in this residual pressure into electrical power or other usable forms of energy. In the recovery of waste heat from sintering, a Venturi heat pump can capture the waste heat generated during the sintering process and use it to preheat the air used for combustion or to heat water, thereby improving energy efficiency, reducing reliance on external energy sources, and minimizing the environmental impact of exhaust emissions. 3. Power industry: During thermal power generation, the waste steam discharged from turbines contains a large amount of thermal energy. The Venturi heat pump waste heat and waste pressure recovery technology can process this spent steam to recover the waste heat contained within it. The recovered waste heat is used to heat the boiler feedwater, increasing the temperature of the water entering the boiler, reducing fuel consumption, and improving the overall thermal efficiency of the power generation system. In cogeneration plants, this technology can also optimize the heating system, improve the quality and efficiency of heat supply, enable hierarchical utilization of energy, and enhance the overall economic and social benefits of the plant. IV. Technical Advantages 1. Significant energy-saving effect: It is capable of effectively recovering the waste heat and pressure generated during the production process, converting them into usable energy sources and thereby greatly reducing a company’s energy consumption. Based on practical application cases, significant energy savings have been achieved in projects across various industries, helping companies save substantial amounts on energy costs. 2. Lower equipment costs: Compared to some complex waste heat recovery systems, the Venturi heat pump system has a relatively simple structure; its main components are the Venturi tube and connecting pipes, etc. The manufacturing, installation, and maintenance costs of this equipment are relatively low. This allows companies to carry out energy-saving upgrades without having to invest excessive amounts of money, offering good cost-performance. 3. Strong adaptability: This technology can be applied to a variety of different industrial production conditions as well as various sources of waste heat and pressure. Whether in high-temperature and high-pressure steam systems or in low-temperature and low-pressure condensate recovery applications, the Venturi heat pump technology for recovering waste heat and pressure can leverage its energy-saving advantages, offering broad application prospects. 4. Outstanding environmental benefits: By recovering waste heat and pressure, the consumption of fresh energy is reduced, thereby lowering the emission of pollutants generated during energy production. At the same time, it reduces the emission of waste gas and wastewater, playing a positive role in environmental protection and helping enterprises achieve green and sustainable development. V. Key Implementation Points 1. Precise System Design It is crucial to carry out a precise system design based on the production processes of different enterprises, the characteristics of their waste heat and pressure resources, as well as their actual needs. It is necessary to accurately calculate the various parameters of the venturi tube and to plan the pipeline layout properly, so as to ensure that the system can integrate seamlessly with existing production equipment and achieve optimal energy recovery. 2. Strict equipment installation and maintenance: During the installation process, it is necessary to follow the design requirements strictly to ensure the quality of installation for the venturi tube and the connecting pipes. Regularly maintain the equipment by checking for wear and corrosion on the venturi tube, as well as any leaks in the pipes. Regularly clean the dirt and impurities inside the equipment to ensure its proper operation and extend its service life. 3. Operation in coordination with other systems: The Venturi heat pump waste heat and waste pressure recovery system does not exist in isolation; it needs to operate in coordination with other production systems within the enterprise. During the design and implementation phases, it is essential to fully consider compatibility with existing steam systems, condensate systems, power systems, etc., in order to avoid affecting the normal operation of other systems and ensure the stability and reliability of the entire production process. The venturi heat pump waste heat and waste pressure recovery technology, thanks to its unique principle, significant energy-saving effects, and broad application prospects, offers an innovative and effective solution for energy conservation and consumption reduction in the industrial sector. As technology continues to develop and improve, it is believed that it will be applied in more industries, playing a greater role in promoting the sustainable development of global energy. Intensification and Integration of Chemical Processes