SU567164A1 - Method of controlling the heat output a group of hot-water boilers - Google Patents

Description

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The invention relates to the field of heat supply and can be used in heating boilers equipped with hot water heating boilers, in particular, to control the heat output of a group of hot water boilers.

There is a known method of controlling the heat and water productivity of a group of boilers by recirculating hot water and bypassing cold (O) from the return pipeline to the direct 1. The basis of this method is the regulation of fuel consumption depending on the required heat load.

The disadvantage of this method is that when regulating the heat output of the boiler house, factors such as wind strength and direction, solar radiation, building layouts, differences in the thermal insulation properties of the walls of heated buildings, etc. are not taken into account.

Due to the need to adjust the heat output from the boiler house, taking into account these factors, the heat output of the boilers is practically manually controlled according to the heat schedule set by the dispatcher.

Another method of controlling the heat output of a group of boilers is known by adjusting the temperature of the hot water behind each boiler by changing

fuel consumption, recycling hot water and controlling the temperature of the direct water flow 2.

This method is the most important to the invention according to the technical essence and the achieved result.

Its disadvantage is the complexity of control, due to the presence in the control system of a special main controller, temperature sensors of ambient air and direct supply water, as well as an electrically conductive connection of the main controller with sensors and fuel regulators on each boiler. In addition, the regulation of the heating capacity of boilers according to the outdoor air temperature in powerful heat supply systems does not ensure full compliance with the heat supply to each heat consumer, taking into account the climatic conditions of the microdistrict.

The purpose of the invention is to simplify and increase the reliability of the automatic control of the heat production of the group of boilers included in the total heating network.

This is achieved by regulating the temperature of the direct water flow by means of bypassing the return flow, and the rate of recirculation of the hot water is controlled by the water flow in each boiler.

The drawing shows a diagram of the device that implements this method.

It contains boilers 1, jumper 2 recycling, bypass line 3, direct water temperature sensor 4, bypass regulator 5, water consumption sensor b, recirculation regulator 7, water temperature behind the boiler 8 (in front of the boiler), regulator Torus 9 fuel consumption.

Performance Management

groups of boilers 1 with recirculation of hot water over bridge 2 are performed by changing the bypass of a part of the return water through line 3 by impulse exposure to direct water temperature from sensor 4 to regulator 5 of bypass (or manually by setting). In this case, any change in the bypass corresponds to a reverse change in the flow rate of the return water in the line after the bypass line. This change in water changes the flow of water through sensor 6, the pulse from which is fed to regulator 7 for recycling. The consumption of water for recovery is varied in such a way that the flow of water through each boiler is kept constant. The change in the ratio of hot and cold water in front of the boilers leads to a change in the temperature of the water in front of and behind each boiler. The impulse on the water temperature from the sensor 8 is supplied to the regulator 9, which changes the fuel consumption in such a way that the water temperature behind (or in front of) each boiler is maintained and maintained. The newly installed heating capacity of all boilers corresponds to the heat load of the heating system.

Thus, this method eliminates the need to regulate the heat output of each boiler separately, provides an opportunity for economical operation of the boiler in the boiler room, simplifies and improves the quality of control of the heat output of hot water boilers.

Claims (2)

1. Zhirnov M. I. Peak hot-water boilers of high power. M. “Energie, 1964, p. 134-151. 2. Buznikov, EF. Water boilers and their use in power plants and boiler houses; M. “Energie, 1965, p. 222-227.