I. Heat supply in mixed water heat exchanger area The mixed water direct supply heat supply method is slow to develop in centralized heating, mainly due to the lack of input of heat network monitoring equipment in the early stage and high requirements for water quality due to high temperature water in the primary net. Major aspects. With the development of heating technology and the application of advanced monitoring equipment in heating systems, when the water temperature of a primary net is not high (that is, the transition period between direct supply and interphase supply of the pipeline network), the direct supply of mixed water heat exchangers is also slow. Slowly find its own control method, at the same time it embodies its unique secondary net system constant pressure method - the return valve constant pressure, to achieve its economic and energy saving advantages. In view of the current status of the heating market, Jinan Yonglitai Electric Equipment Co., Ltd. and Siemens Building Technology Co., Ltd., which is renowned in the world, aim to complement each other and work closely together with professional technical support and high-quality pre-sales and after-sales services. Provide users with efficient, energy-efficient heating solutions:
☆ Data acquisition and monitoring system for heating network ☆ Unattended control system for heat exchange stations ☆ Better thermal network thermal balance ☆ Reasonable heat distribution ☆ Increased heat transfer efficiency ☆ Heat metering and charging Solutions ☆ Flexible and diverse communication systems
II. Prospects for Heat Supply in Mixed Water Heat Exchange Districts The market status of heat companies and heat consumers is undergoing drastic changes.
First of all, the privatization process of heat companies changed ownership and management methods. In an increasingly fierce competitive environment, improving user satisfaction, increasing system operating efficiency, and effectively reducing operating costs should become the dominant principle of its operations.
Second, national policy adjustments and environmental protection requirements have far-reaching implications for thermal companies. Thousands of low-efficiency small-boiler heating methods are being replaced by clean and environmentally friendly cogeneration plants; the waste heat generated in cogeneration is being used to increase the heating and hot water in the room, which also increases the The comprehensive utilization efficiency of fuel.
Third, the common people want a cleaner environment and a comfortable life. More people realize that heating is a kind of tasteful service, especially in the new heating regulations to be promulgated and implemented. The standard for heating charges will be based on the actual amount of heat and will not be charged according to the construction area. Under this condition, the heating company must change the original operation mode: users will be able to decide when to use heat energy and its quantity, and the heating company will have to respond to the heat source and heating network distribution system according to the user's heat consumption at any time. Adjustments.
The heating control and billing system will meet the following requirements:
☆ User side:
â—‹ The independence of each user's heating, metering and billing: Realize “on-demand heating, charge by quantityâ€;
â—‹ In extreme operating conditions (low return temperature or high return temperature), the control system can quickly adapt and increase efficiency.
☆ Heat exchange station side:
â—‹ Under the premise of ensuring the provision of sufficient heat for users, the automatic control system will realize highly efficient unattended operation;
○ The “small flow rate, large temperature difference†operation in the heat exchange station under the guidance of the automatic control system will help balance the overall heat network transmission and distribution system, improve the heat exchange capacity and reduce the operating costs.
III. Overview of Automatic Control System for Heat Supply in Districts with Mixed Water Heater The overall solution provided by our company gives users the entire heating control system; meanwhile, the system and product are highly compatible and will be easily integrated together. The technical requirements for the district heating automatic control system are obvious. The establishment, development and operation of the district heating network must satisfy the specific requirements of the heating system in terms of hardware, software, products and services. Therefore, the planning and definition of the automation system is very important. It will affect the scalability of the system and the effective handling of the heating network. In particular, when investing in a new automatic control system for decision-making, the following factors should be considered by decision-makers:
☆ System scalability:
The SCADA has the ability to increase or expand to the ideal size of the heating system. In other words, it will be able to increase the number of connected controllers and stations as needed as the project progresses.
☆ Communication diversity:
The SCADA system needs sufficient open functionality so that different communication methods can be selected. Usually thermal companies will adopt multiple communication methods at different stages of development.
☆ The standard of the system:
Universal standards in architectures (such as software platforms) and communications (such as TCP/IP) improve compatibility with other systems (data exchange or system integration)
☆ The openness of the system:
The automatic control of heat source and heating network transmission and distribution systems needs to be coordinated and unified.
☆ The advanced nature of the system:
The adoption of advanced self-controlled products and systems is a guarantee for the company's profitability and customer satisfaction. For example, heat exchange stations are usually unattended and when some abnormality occurs, the nearest service personnel can be notified by SMS. So that it can reach the scene in the shortest time and quickly make remedies. All this needs to be completed in a short period of time so that the user will not feel the interruption of the heating. A reliable heating system will increase the user's satisfaction and be more willing to pay for the heat.
☆ The long-term nature of the system:
This system will be used and expanded for a long time, so ensuring its availability and applicability is crucial to protecting the interests of investors.
☆ System Reliability:
The reliability and effectiveness of self-controlled products and systems are critical to the safety and efficiency of heating companies.
☆ Expertise of the system:
Heat source and heating network transmission and distribution systems should operate efficiently under the guidance of automatic control systems. By controlling the heat and flow of the heating system, or reducing the heat supply for unmanned buildings, the entire system can be operated efficiently.
A network water supply regulating valve is mainly adjusted by the ratio of the secondary water supply temperature adjustment opening to the mixed water; the mixed water circulating pump is controlled by the flow of the secondary water supply; and the primary return control valve is adjusted by the secondary return pressure.
Fourth, regional heating automatic control system program
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