On the characteristics of small-scale combined coo

2022-08-09
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On the characteristics of small-scale cogeneration system and the current situation of main equipment (Part 2)

its process flow is as follows:

3 characteristics of small-scale cogeneration

cogeneration is a multi cogeneration system based on the concept of cascade utilization of energy, which integrates refrigeration, heating (heating and hot water supply) and power generation, with the purpose of improving energy efficiency and reducing the emission of carbides and harmful gases. Compared with centralized power generation and remote power transmission, CCHP can greatly improve energy efficiency: the power generation efficiency of large power plants is generally 35% - 55%. After deducting the auxiliary power consumption and line loss rate, the utilization efficiency of terminals can only reach%. The energy utilization rate of small-scale CCHP can reach 90%, without transmission loss. In addition, small-scale CCHP has great potential in reducing carbon and air pollution emissions. Because of its good environmental protection performance, small-scale CCHP is not the same concept as small units

at the beginning of the 20th century, the domestic diaphragm market will develop towards high-end diaphragm products with high porosity and thin film. The popular view in the industry is that the larger the capacity of the generator set, the higher the efficiency, the lower the investment per kilowatt and the lower the invention cost. However, in many special cases, small-scale CCHP is an indispensable and important supplement to centralized power supply:

(1) small-scale CCHP can meet the needs of special occasions. For example, users with high requirements for power supply security and stability, such as hospitals, banks, etc; Users with diversified energy needs need not only electricity, but also hot or cold energy supply. The biggest advantage of this power supply mode is that it does not need long-distance transmission and distribution equipment, significantly reduces transmission losses, operates safely and reliably, and can conveniently and flexibly use exhaust heat to realize CCHP as required, so as to improve energy utilization

(2) the small-scale CCHP power supply mode can make up for the lack of safety and stability of large power. For example, in August 2003, the large-scale power outage in North America was a typical negative teaching material. The small-scale gas-fired cogeneration system is actually an interconnection of energy facilities. It improves the reliability of urban energy supply through the interconnection of honeycomb small-scale and energy supply facilities. In addition, the equipment of each manufacturer has designed automatic frequency modulation and parallel system, which can ensure the safe operation of electricity. In case of power collapse and unexpected disasters (such as earthquake, snowstorm, man-made destruction, war), the power supply of important users can be maintained

(3) the small-scale cogeneration power supply mode provides the possibility for the comprehensive cascade utilization of energy. In the conventional centralized power supply mode, the form of energy is relatively single. When users not only need electricity, but also need the supply of other energy forms, such as cold energy and heat energy, it is difficult to realize the comprehensive cascade utilization of energy only by using electricity to meet the above needs to synthesize a unique structure; while the small-scale CCHP power supply mode has the characteristics of small scale and strong flexibility, through the organic integration of different cycles, it can meet the needs of users and realize the comprehensive cascade utilization of energy at the same time, And it overcomes the difficulty that cold energy and heat energy cannot be transmitted in a long distance

(4) small gas-fired cogeneration can more effectively allocate resources, stably and continuously use natural gas, coalbed methane and other resources, reduce the regulation of gas, reduce the decline of storage production ratio and unnecessary resources such as the loss of underground gas storage due to the increase of 10 billion gas peak shaving every year in recent years, reduce labor intensity waste, reduce the construction investment of gas pipes, and improve the operation efficiency of equipment, So as to reduce the cost of gas utilization and improve the competitiveness of gas enterprises

(5) under the planned economic system, the industry is divided by products. The products and tasks of energy facilities are very single. Electricity, heat and gas are independent. The repeated investment and construction of energy facilities increases the operating cost, reduces the efficiency, and directly increases the energy cost. The small-scale combined cooling, heating and power generation breaks the traditional boundaries, takes into account the rational utilization of heating, hot water, electricity, cold, gas, water resources and environmental pollution control, and exchanges the minimum cost of capital, resources and environment for the highest investment efficiency, energy conversion efficiency and energy facility efficiency

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