Comprehensive Analysis of Energy Saving measures in Central heating and heating Network system
Source: China Energy Saving Network
Central heating is the traditional heating mode. How to take effective energy saving measures to reduce energy consumption, improve the utilization of energy and ensure the reliability of heating system is a concern of many thermal power companies. In view of the current situation of urban heating network, Shenyang Henlith Company summarized the system engineering experience of heating network heat exchanger station for many years, and optimized the control scheme of heating network heat exchange station system through the technical analysis of the heating network system. For everyone to share the specific energy-saving measures of the central heating and heating network system.
Energy-saving measures of heat network
Replace heating network
For a long time out of repair, is close to the end of life, there are potential safety risks for the replacement of the pipe network. The replacement heating network should be combined with the heat demand to consider expansion and consolidation. Through technical and economic analysis, reasonable selection of revamped pipe diameter, pipe position and laying mode. Avoid reconstruction soon and insufficient load, resulting in duplication of construction and economic losses.
For steam pipe network which is not installed or installed but not put into operation and corroded seriously which can not be used, combined with the renovation of heating network, it is added and replaced with condensate pipe and drain pipe. At the same time, the valve, compensator, water trap and other pipe accessories are repaired and maintained. Use the valve, compensator, water repellent and so on to replace the corresponding failure accessories with good anticorrosion performance. New energy-saving insulation materials are used for pipe insulation. For some heating pipe networks which do not need to be replaced but the insulation layer is seriously damaged, the new energy-saving insulation material is replaced, the waterproof and anticorrosive treatment is strengthened, and the new material is used as the pipeline protective layer. Yes, set up in air defense The heating pipe network in the cave should be removed or waterproofing, as well as the repair and waterproofing of the pipe ditch.
2, implementing networked operation
For the heating system whose heating area is more than 1 million m2, according to the design specification of urban heating pipe network, the requirement of multi-heat source network operation should be satisfied, and the heat source main lines should be connected. When the technology and economy are reasonable, the main line of thermal power network can be connected into a ring. At the same time, the pump house and plant pipe network of the related heat source are reformed while the urban central heating network is reformed.
3, change the laying method
Change the air dressing for underground laying, change the ground ditch laying for directly buried laying. A new type of directly buried vacuum insulation pipeline prefabricated by steel or PE casing and non-compensation direct buried construction technology is adopted to reduce the pipe accessories such as compensator reduce the cost and prolong the service life of the pipe network.
4. Do a good job of hydraulic balance.
On the basis of investigation, the necessary hydraulic calculation of the primary network and the larger secondary network is carried out, and measures are taken to do a good job in the hydraulic balance of the pipe network. Carry on the pipe network reform pertinently, overcome the hydraulic condition maladjustment phenomenon, reduce the blindness of the pipe network reform. In order to improve the level of automatic control and management, the automatic monitoring and control system of urban central heating network, such as remote communication control and regulation system, are added. The high-tech means are used to monitor and regulate the operation condition of the pipe network, to improve the operation efficiency of the heating network, to improve the energy utilization efficiency and the economic benefit of the heating enterprises, to reduce the incidence of accidents, to ensure the safety and economic operation of the urban heating system.
5, eliminate security risks
The pipe network water hammer analysis and calculation should be carried out for the central heating pipe network of large cities. With the reformation of the pipe network, measures are taken to prevent the occurrence of the water hammer in the heating network and eliminate the hidden danger of safety. Condition can be added pipe network leakage detection, alarm device and ground fracture zone stress change monitoring device and so on.
6, overcome the inhomogeneity of cold and heat
In order to ensure the flow balance of pipe network, the flow balance valve is installed in the inlet of the user thermal power station, and the flow rate through the valve is limited by mechanical device under the condition of the pressure difference between the inlet and outlet of the valve changing, and the flow rate of the controlled object is kept constant. Fundamentally solve the phenomenon of uneven heat, near-hot and far-cold. Furthermore, the circulating water quantity of the secondary network is reduced, the load of the motor is reduced, the operation cost of the heat exchanger station is saved, and the heating quality is improved at the same time. On this basis, the heating area can be increased and the "excess" heat can be used to develop new users and reduce the heating cost.
Energy saving measures of heat exchange station
(1) replacement of equipment. Replace old, inefficient heat exchangers, pipes and accessories, install climate compensator, self-operated temperature control valve and other flow rate, temperature control device, and add heat metering device.
(2) changing the mode. The direct connection system is changed to indirect connection system to increase the number of necessary thermal stations, or to integrate the thermal power stations at the same time as the pipe network is renovated.
(3) system optimization. Optimize the selection of circulating pump, control the energy consumption of pump according to the relevant energy-saving standards, reduce the number of parallel pumps, and improve the working efficiency of parallel pumps. Set up cascade flow pump or variable frequency pump. Add a, secondary network of water metering function. Replace the water treatment equipment, improve the treatment effect of the water treatment device, make the water quality meet the requirements. Gradually complete the thermal station automatic control system construction, realize the communication with the heating network, quantitative management function and effective control.
Energy Saving measures of Secondary Network system
In view of the problems of the secondary heating network system, some pipe networks are changed, the diameter is expanded and the insulation layer is replaced. Add a calorimeter to the thermal inlet of the user's unit or building. Do well the hydraulic balance of the secondary network, and install the flow or pressure balance device at the branch of the secondary network and the thermal inlet of the building if necessary. The energy consumption of circulating water pump in secondary network is controlled and its efficiency is improved. Set up cascade flow pump or variable frequency pump. Strengthen the secondary network replenishment measurement and control.
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