introduction
Thermal power plants, the plant electricity accounts for about 8% of the total generating capacity of 10%, pump and fan power consumption accounts for about 70% to 80% of plant electricity, therefore, to reduce pump and fan power consumption for increased Power plant economic benefits have a great role. The circulating pump power consumption and season and load are related to the transformation of its frequency, both to ensure its effective work, but also to ensure its low load and different seasons minimum power consumption, flexible use, energy-saving effect is obvious.
First, the pump energy-saving technology in China's development trend
At present, many domestic and international electric drive occasions have vector control of the inverter has been widely used in general machinery, textile, printing and dyeing, paper making, steel rolling, chemical industry AC motor stepless speed regulation, has achieved significant energy-saving and meet the process And automatic speed requirements. However, fan, pump applications are still not fully used. The main reason is that the fan, pump load can save a lot of energy to understand enough. Therefore, we will fan, pump energy conservation principles and application of the situation to the customer. National fans and pumps account for more than 60% of the industrial electricity consumption. If we can make full use of inverters for frequency stepless speed regulation in this field, it is a policy to rejuvenate our country where there is a serious shortage of power in the processing and manufacturing industry. Fan, is to send gas device. Pump, is to send water or other liquid devices. In terms of its structure and working principle, the two are basically the same. Fan to illustrate the first example. Natural ventilation cooling tower, circulating water pump, circulating water pipeline and pipeline attachments are important components of circulating water system in power plant. It is of great significance to study the system plan to determine the optimal system configuration in the preliminary design of power plant, which can reduce the construction cost. The most important part of the design of circulating water system is the rational choice and configuration of natural ventilation cooling tower and circulating water pump. In the construction of circulating water system, they have the highest investment cost, the most complex construction and the greatest impact on the total investment of power plant. Directly affect the unit cost of power engineering construction and plant investment recovery period. The optimal design of the water supply system is the basis for the selection of the system solution. Among them, the annual cost of the circulating pump motor is the most important factor affecting the design of the water supply system. Under the premise of ensuring the safety of turbine running at full capacity, how to reduce the annual cost of electric motor is worth every engineering designer's thinking.
Second, the pump in the course of the problem
1, pump design technology is not high
At this stage, our country's pump design is mainly followed the traditional model conversion method and speed coefficient method, these design methods to some extent is out of date, because it is based on the old pump design experience, based on the design process can not Beyond the design level of the past, there is no breakthrough in efficiency improvement. Coupled with the pump design unit of capital investment in technology and staff input inadequate, lack of innovative design of the pump motivation, lack of awareness of innovation, resulting in the technical content of pump products can not be a qualitative improvement, the pump itself can not Enhancement, energy-saving work can not be done naturally. Coupled with the one-sided emphasis on economic efficiency pump manufacturers, while neglect the energy-saving pumps, the state does not have the policy support and financial incentives in this area, resulting in pump manufacturers to pump energy efficiency and improve efficiency of the pump nor enthusiasm.
2, there are errors in energy-saving pumps
Our past understanding of the energy-saving pump is mainly to improve the efficiency of the pump index, in fact, this is a misunderstanding of energy-saving pump is a one-sided understanding. What we are talking about is not just an indicator of efficiency, but also the stability of the pump's performance, the life of the pump, the material savings, and more. Then there are specific to the use of the pump environment, we must also targeted energy-saving design, such as the sealing performance of the pump, the pump hydraulic performance, pump high temperature performance, etc., which must be for different environments, unused use Design. Therefore, energy-saving pump research is a very complex task, our understanding of energy-saving concepts can not be too one-sided, but to have a comprehensive understanding of the whole.
3, the use of units and personal factors
The use of units and everyone in the procurement of pumps, the pump is often concerned about is not meet their own needs, the price is not cheaper, and energy-saving pump on the technical indicators, but do not really care about. This demand of consumers also dispelled the enthusiasm of pump design units and manufacturing units for energy-saving technological innovation. And a large part of consumers in the choice of pump, to choose the flow and headroom is too large pump to ensure that they can meet their own needs, such a direct result of the pump in use, the actual operating efficiency is far below The maximum efficiency of the pump has not been able to operate in the high-efficiency zone. In addition, the use of the process, due to the use of units of management and inspection is not rigorous, improper operation and maintenance, maintenance is not timely, so that the pump often fails during use, resulting in a lot of energy waste.
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