Intelligent heat-exchange machine set

[0012] An intelligent heat exchange unit includes a steam inlet 17, a shell-and-tube heat exchanger 13, a circulating water pump 12, a make-up pump 3, a make-up tank 1, a water return port 10, a water supply port 18, and a condensate water outlet 19. The steam inlet is connected to the heat exchanger through an electric regulating valve 14, and an exhaust pipe 15 and a drain valve 16 are installed on the heat exchanger. One end of the circulating pump is connected to the heat exchanger, and the other end is connected to the return pipe 7 through the check valve 8. One end of the return pipe 7 is connected to the make-up pump through the elbow 6 and the butterfly valve 4. The make-up pump is connected to the flange 2 The water supply tank is connected, and the other end is connected to the water return port 10 through a butterfly valve 9. The input end of the electric regulating valve and the input end of the make-up pump are connected with the output end of the control circuit board. The above-mentioned control circuit board adopts SDC digital servo circuit.

[0013] The working process of the present invention is: using 0.1-0.8MPa steam as a heat source, using a shell-and-tube heat exchanger to exchange steam and water, and adopting advanced control to open and close the steam to achieve the purpose of constant temperature water supply. Steam enters the shell-and-tube heat exchanger through a pipeline with an electric regulating valve. When the water temperature (feedback signal) reaches the set temperature (input signal), the thermal resistance installed on the unit will weaken 4- The 20 mA current is input to the signal processing circuit to convert the analog signal into a digital signal, and then the digital signal is sent to the digital processing system for processing, and then the processed digital signal is output to the logic signal discrimination circuit to discriminate open or closed valves The signal required by the circuit, which is processed by the anti-vibration circuit for damping, and then is driven by the drive circuit to close the electric regulating valve to prevent steam from entering the heat exchanger. When the water temperature (feedback signal) is lower than the set temperature (input signal), repeat the above process, open the electric regulating valve, so that the steam enters the heat exchanger again to work, realizing constant temperature water supply.

[0014] This unit can also achieve automatic water supply or frequency conversion water supply to ensure the normal operation of the system. At the same time, it can realize automatic alarm and automatic stop operation.