CN205537192U - Closed cooling tower automatic antifreeze crack heating cycle protection system - Google Patents

Abstract

The utility model discloses a heating cycle protection system is split to automatic preventing frostbite of closed cooling tower, including setting up the heat exchanger in the cooling tower, its end of intaking communicates the inlet tube through the water knockout drum, its water end (W. E. ) process water collector intercommunication outlet pipe, and the intercommunication is provided with the wet return between inlet tube and the outlet pipe, and the one end of returning the water piping connection inlet tube is higher than other end setting, and the lower one end of wet return is equipped with circulating water pump, and the higher one end of wet return is equipped with the stop valve for the electric heater of heating pipe water -logging, be used for temperature in the monitoring pipe temperature sensor and circulating water pump all is connected with the temperature control device electricity. The utility model provides an it is rational in infrastructure, can realize automatic preventing frostbite, save the electric energy, need not anti -icing fluid, have energy -concerving and environment -protective effect.

Description

Closed cooling tower automatic antifreeze crack heating cycle protection system

technical field

The utility model relates to an automatic antifreeze crack heating cycle protection system for a closed cooling tower, which belongs to the technical field of antifreeze for cooling towers.

Background technique

Closed cooling towers are used in many places that need to cool down. At present, they are mainly used in induction heating equipment of electric furnaces (smelting furnaces, holding furnaces, diathermy furnaces, vacuum furnaces, quenching furnaces), central air conditioning, hydraulic systems, forging, metallurgy, textiles and chemical industries. The closed cooling tower has an air inlet and a water collection tank at the bottom, a fan at the top, a heat exchanger in the middle, and a spray pipe above the heat exchanger. The heat exchange tubes are connected to the return water pump and the circulating water tank through pipelines, and some of the pipelines are located at the equipment to be cooled, and the heat of the equipment to be cooled is taken away by the water in the pipelines.

In the prior art, when the main cooling circulation pipeline is closed and the ambient temperature is low, in order to prevent the water in the heat exchanger from freezing and causing the coil to crack, antifreezing treatment must be performed on the heat exchanger. One of the existing antifreeze measures is: when the external ambient temperature is very low, heat the water in the sump at the bottom of the cooling tower and spray the heat exchanger through the spray pipe to heat the heat exchanger to avoid freezing of the liquid in the heat exchanger. During this process, the water pump needs to continue to work. The problem with the above method is that due to the large amount of water in the sump and the high power of the water pump, the energy consumption is large, which is not conducive to energy saving; the second existing antifreeze measure is: The problem of adding antifreeze to the water in the cooling circulation pipeline is that the antifreeze is volatile and pollutes the environment after discharge, which is not conducive to environmental protection.

Utility model content

In this regard, the utility model aims to provide an energy-saving and environment-friendly closed cooling tower automatic antifreeze crack heating cycle protection system.

The technical scheme that realizes the utility model purpose is:

A closed cooling tower automatic anti-freezing crack heating cycle protection system, including a heat exchanger arranged in the cooling tower, the water inlet end is connected to the water inlet pipe through the water separator, and the water outlet end is connected to the water outlet pipe through the water collector. A water return pipe is connected between the water inlet pipe and the water outlet pipe. One end of the water return pipe connected to the water inlet pipe is higher than the other end. The lower end of the water return pipe is equipped with a circulating water pump, and the return pipe is higher. A cut-off valve is installed at one end of the pipe, and the electric heater for heating the water in the pipe, the temperature sensor for monitoring the temperature in the pipe and the circulating water pump are all electrically connected to the temperature control device.

In the above technical solution, the electric heater is a plug-in electric heating tube or an external heater.

In the above technical solution, a water flow switch is provided on the water inlet pipe, and the water flow switch is connected in series with the electric heater and the control circuit of the circulating water pump.

In the above technical solution, the water inlet pipe and the water outlet pipe are provided with drain valves.

The utility model has positive effects: (1) adopting the structure in the utility model, after the main cooling circulation pipeline is closed, the heating circulation system is kept in the energized state, when the temperature sensor monitors that the temperature in the tube is lower than that of the temperature control device When the temperature T1 is set (for example, 3°C), the temperature control device controls the electric heater to start heating. The directional flow in the circuit composed of the water collector, the water collector and the outlet pipe achieves the antifreeze effect. When the temperature sensor detects that the temperature is higher than the set temperature T2 of the temperature control device (such as setting 20°C), the temperature control device controls the electric heating The heater stops heating, and the circulating water pump stops working at the same time; in the utility model, since the electric heater heats a small amount of water, and the circulating water pump can use a low-power water pump, and there is no need to add antifreeze to prevent freezing, so the effect of energy saving and environmental protection is achieved.

Description of drawings

Fig. 1 is a structural schematic diagram of the automatic anti-freezing and cracking heating cycle protection system of the centrally closed cooling tower of the present invention.

The reference signs shown in the figure are: 1-cooling tower; 2-heat exchanger; 3-water separator; 4-water inlet pipe; 5-water collector; 6-water outlet pipe; 7-water flow switch; Valve; 9-return pipe; 10-stop valve; 11-electric heater; 12-temperature sensor; 13-circulating water pump.

detailed description

The concrete structure in the utility model is described below in conjunction with accompanying drawing of description:

A closed cooling tower automatic anti-freezing crack heating cycle protection system, as shown in Figure 1, includes a heat exchanger 2 arranged in the cooling tower 1, its water inlet is connected to the water inlet pipe 4 through the water separator 3, and its water outlet The water outlet pipe 6 is communicated with through the water collector 5, and a water return pipe 9 is communicated between the water inlet pipe 4 and the water outlet pipe 6. One end near the water outlet pipe 6) is provided, the lower end of the return pipe 9 is equipped with a circulating water pump 13 near the end of the water outlet pipe 6, and the higher end of the return pipe 9 is equipped with a shut-off valve 10 near the end of the water inlet pipe 4 (The function of setting the shut-off valve 10 here is to ensure that the water flow cannot flow into the return pipe 9 by the water inlet pipe 4 but can flow into the water inlet pipe 4 by the return pipe 9, thereby preventing the water flow from bypassing the replacement pipe when the main cooling circulation line is working. The heater 2 directly flows from the water inlet pipe 4 through the return pipe 9 and enters the outlet pipe 6), the electric heater 11 for heating the water in the pipe, the temperature sensor 12 for monitoring the temperature in the pipe and the circulating water pump 13 are all connected with the temperature control The device is electrically connected. With the structure in this embodiment, after the main cooling circulation pipeline is closed, the heating circulation system is turned on. When the temperature sensor 12 monitors that the temperature in the tube is lower than the set temperature T1 (such as setting 3° C.) of the temperature control device, the temperature The control device controls the heating of the electric heater 11, and the circulating water pump 13 works to drive the water in the pipe to flow through the circulating water pump 13, the return pipe 9, the stop valve 10, the water inlet pipe 4, the water separator 3, the heat exchanger 2, the water collector 5 and The directional flow in the circuit formed by the outlet pipe 6 achieves the anti-freezing effect. When the temperature sensor 12 detects that the temperature is higher than the set temperature T2 (such as setting 20°C) of the temperature control device, the temperature control device controls the electric heater 11 to stop heating , while the circulating water pump 13 stops working; in the utility model, because the electric heater 11 heats a small amount of water, and the circulating water pump 13 can use a low-power water pump, and it is not necessary to add antifreeze to prevent freezing, so the effect of energy saving and environmental protection is achieved.

The electric heater 11 in this embodiment is a plug-in electric heating tube or an external heater.

Further, the water inlet pipe 4 is provided with a water flow switch 7, the water flow switch 7 is connected in series with the control circuit of the electric heater 11 and the circulating water pump 13, and the water flow switch 7 is in the normally open state, that is, in the main cooling When the water in the circulation pipeline flows directionally (that is, the main cooling circulation pipeline is working), the water flow switch 7 is always in the off state due to the water flow in the main cooling circulation pipeline. At this time, the control circuit of the electric heater 11 and the circulating water pump 13 It is not connected, so as to avoid the possible malfunction of the electric heater 11 and the circulating water pump 13 when the main cooling circulation pipeline is working, and when the water in the main cooling circulation pipeline does not flow (that is, the main cooling circulation pipeline is closed), the water flow The switch 7 will be closed due to losing the effect of the water flow in the main cooling circulation pipeline so as to connect the control lines of the electric heater 11 and the circulating water pump 13. state, when the temperature control device sends an action signal, the electric heater 11 and the circulating water pump 13 start to work, so it has a good protective effect.

In this embodiment, the water inlet pipe 4 and the water outlet pipe 6 are provided with a drain valve 8, and this structure facilitates the discharge of water in the pipeline after the drain valve 8 is opened.

Apparently, the above-mentioned embodiments of the present utility model are only examples for clearly illustrating the present utility model, rather than limiting the implementation manner of the present utility model. For those of ordinary skill in the art, on the basis of the above description, other changes or changes in different forms can also be made. It is not necessary and impossible to exhaustively list all the implementation manners here. And these obvious changes or changes derived from the essential spirit of the present utility model still belong to the protection scope of the present utility model.

Claims (4)

1. A closed cooling tower automatic antifreeze crack heating cycle protection system, including a heat exchanger (2) arranged in the cooling tower (1), the water inlet end of which is connected to the water inlet pipe (4) through the water separator (3) , the water outlet is connected to the water outlet pipe (6) through the water collector (5), and it is characterized in that a return pipe (9) is connected between the water inlet pipe (4) and the water outlet pipe (6), and the One end of the return pipe (9) connected to the water inlet pipe (4) is set higher than the other end, the lower end of the return pipe (9) is equipped with a circulating water pump (13), and the higher end of the return pipe (9) A stop valve (10), an electric heater (11) for heating the water in the pipe, a temperature sensor (12) for monitoring the temperature in the pipe and the circulating water pump (13) are all electrically connected to the temperature control device. 2. The closed cooling tower automatic anti-freezing crack heating cycle protection system according to claim 1, characterized in that, the electric heater (11) is a plug-in electric heating tube or an external heater. 3. The closed cooling tower automatic antifreeze crack heating cycle protection system according to claim 1 or 2, characterized in that, the water inlet pipe (4) is provided with a water flow switch (7), and the water flow switch (7) It is connected in series on the control circuit of the electric heater (11) and the circulating water pump (13). 4. The closed cooling tower automatic anti-freeze crack heating cycle protection system according to claim 1, characterized in that, the water inlet pipe (4) and the water outlet pipe (6) are provided with a drain valve (8).