Abstract: The system of central heating pipe network is a system with strong coupling, huge input and output. It can cover many fields, including thermodynamics and fluid mechanics. The successful application and continuous development of energy-saving control system of central heating pipe network not only perfectly solved the unmanageable problem of heating pipe network, but also greatly enhanced the resource saving of central heating pipe network system. Based on this, this article discusses and studies on energy-saving monitoring of central heating network.

Since the reform and opening up, the economy of our country has started to develop rapidly. The process of urbanization is also accelerating. Some large-scale cities have built up urban heating systems and have gradually become an important infrastructure within the city. The demand for heating in our country is now constantly moving southwards. It is estimated that there will be 7 billion square meters of area in our country where heating facilities need to be built. According to the current building energy consumption level, the annual energy required for heating will increase by 1.4 It will be seen that China is facing huge energy pressure. In order to ensure heating, energy conservation, improve heating efficiency, central heating network energy saving control system came into being, for China's central heating has made a significant contribution.

1, the initial adjustment of the system

1.1 early adjustment method

The entire system can be normal operation, the initial adjustment played a very important role. In the initial stage of operation of central heating network management, uneven hot and cold flow and unbalanced flow in different places are more likely to occur. Therefore, preliminary adjustments are needed to solve these problems and maintain the system running status. The initial adjustment mainly depends on the room temperature data collected by the monitoring system. Through the collection of irrational data, traffic imbalance warning is made, and then the background of the system is calculated to estimate the location where the problem occurs so as to conduct the heating network traffic adjust.

1.2 Estimate design flow

In the process of initial adjustment, the system estimates the design flow in the background. The main method is to calculate the thermal load using the area thermal index method, and obtain the design flow value by bringing the heat load into the flow calculation formula, Flow calculation formula is as follows:

G in the above formula refers to the heating network traffic, Q refers to the estimated heating load, â–³ t refers to the water supply pipe network between the temperature difference. The relevant regulations indicate that the boiler heat source â–³ t can not be less than 20 degrees Celsius, the Q value can be estimated according to the following formula:

qf said building heating area thermal index, F said the heating building area. The value of different buildings qf is also different, taken by the energy-saving measures are also different. Table 1 shows the recommended heating value without energy saving measures and Table 2 shows the recommended heating value with energy saving measures.

1.3 traffic balance adjustment

Flow balance adjustment There are two options, one is based on the pressure of the various parts of the flow balance adjustment, the second is based on design flow estimated value,

The use of self-flow balance valve to regulate the flow of the appropriate to ensure that the system flow balance, uniform heating.

2, run regulation

2.1 heat exchanger station energy-saving monitoring

2.1.1 heat exchanger test parameters

The general monitoring system monitors the heat source is the boiler, and the boiler is a relatively complex independent system, with the second network is not relevant, so the monitoring system of the heat source monitoring system only for some safe operation of the basic The parameters are discussed. One of the key parts detected by the heating network energy-saving monitoring system is the heat exchange station, and the data to be tested by the heat exchange station is shown in Table 3.

2.1.2 Heat Exchange Station energy saving control strategy

Heat exchange station's main function is to pass the heat through a network system to the secondary network system. In order to achieve the purpose of energy-saving heat transfer station, a network through the amount of regulation to change the way the second network of water temperature, so that the secondary network to complete the quality - volume of the integrated regulation. The amount of regulation refers to the installation of electric control valve in a network to a network of water supply pipe directly into a part of the return pipe, without the heat exchanger, a network system as a constant flow system. The heat exchange station can also detect the outdoor temperature in real time, predict the outdoor temperature through the detected data, greatly avoiding the influence of system lag and system lag, thereby saving energy.

2.2 climate compensator energy-saving control

Climate compensator is a high degree of automatic energy-saving control device, according to changes in outdoor temperature, a network of water supply flow regulation, according to the preset curve rules, so as to adjust the secondary network water temperature. If the outdoor temperature suddenly decreases, the climate compensator will adjust the opening of the electric control valve according to the preset curve to raise the water temperature and maintain the indoor temperature. Similarly, when the outdoor temperature increases, the climate compensator will also reduce the water temperature by adjusting the opening of the electric control valve to keep the temperature in the room unchanged. The climate compensator's intelligent regulation of room temperature reduces system operating costs and saves energy and resources.

2.3 pump energy saving control

Heat exchange station internal make-up pumps and circulating pump frequency control by the water supply flow changes, the secondary network circulating pump fluid flow and temperature will not be a fixed value, so the use of constant pressure control method, the makeup pump The use of constant pressure control method.

2.3.1 circulating pump control method

Circulating pump pipe network in different locations of the pressure difference is not the same, the pipe network operating conditions by the pressure difference. In order to make sure the way of constant pressure, the most unfavorable pressure difference of the loop will generally be preset. There are two ways to control the circulating pump differential pressure, respectively, the pressure is fixed at the proximal and distal pressure. One of the near-end pressure is installed at the pump inlet and outlet pressure monitoring point, with a relatively short distance from the heat source, on the contrary the distal pressure will set the monitoring point at the user to play the heat entrance, far away from the heat source. The way of constant pressure is determined by the characteristics of the heating pipe network system and whether the equipment is installed conveniently. Both of these constant pressure methods have advantages and should be installed according to the actual conditions.

2.3.2 make up pump control method

Through the hot water circulation in the water supply system, thereby generating heat for heating. Recycling process will certainly produce loss of hot water, so the system replenishment is necessary to enable the normal flow of water within the system to ensure the normal operation of the system. The system can reduce the internal water pressure through the performance of the pump variable frequency equipment through the constant pressure point pressure changes

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