Heat-exchange apparatus

FIELD: heavy industry, applicable for cooling of circulating water of industrial enterprises.

SUBSTANCE: the heat-exchange apparatus has several cooling stages, each of them being made in the form of sections having a zigzag radiator, blow fan supplying the air flow directly to the zigzag supplying pipeline, and offtakes, and the rate of flow of cooling air produced by the blow fan is controlled with the aid of an induction motor fed and controlled by a frequency converter depending on the signal running from the temperature-sensitive element installed past the heater; the cooling stages are changed over with the aid of an automatic cooling water temperature control system.

EFFECT: reduced labor content of production, provided maintenance of the temperature of the heat-transfer agent within a preset range with the aid of a monitoring system.

2 dwg

 

The invention relates to heavy industry. It can be used for cooling circulating water of industrial plants and improves the efficiency of heat exchange.

Known heat exchanger /Patent SU # 1645802 A1, class F 28 D 1/047//F 28 D 15/02 "heat Exchanger", authors: Muevelo, Vaultmate, Oijoku, Net, Fiesole, Mel, Vagarosa, Assisted/, comprising a housing, inlet and outlet pipes with a cooled fluid channels for supplying and discharging the heating fluid is placed in the case of the zigzag tube matrix connected to said pipes and having spaced tiers of interconnected horizontal sections of the heat pipe with boiling intermediate heat carrier provided with horizontal sections are installed vertically between the horizontal areas with edges, while evaporative area of the pipe installed in the area downstream of the tiers, and the condensation is adjacent via the additionally installed insulation strip to the area upstream of the tier.

In the analog, there is no control of chilled water temperature, thus it is impossible to maintain the coolant at a predetermined threshold. Furthermore, the presence of vertical fin Teplov the x pipe increases the design complexity, the difficulty of manufacture.

The task of the invention is to reduce the complexity of the manufacturing process and the ability to maintain the temperature of the heat carrier in a predetermined threshold using the control system.

The invention consists in that the heat exchanger containing, with the aim of improving heat from the coolant used several cooling stages, each of which is made in the form of sections containing zigzag radiator, blower fan to provide air flow directly on the zig-zag supply line and outlet channels, and control of the flow rate of the cooling air generated by the blower fan is performed by using an asynchronous motor fed and controlled by a frequency Converter depending on a signal from a temperature sensor that is installed after the heater; switching between cooling stages is performed using an automatic system for regulating the temperature of the coolant water, whereby the temperature sensor connects relay limit current exceeds a given magnitude of current that your contacts includes an actuator opening additional stage cooling using a DC motor.

Figure 1 shows a heat exchanger system and the automatic temperature control; figure 2 - automatic control system by opening the valve.

Heat exchanger with automatic temperature control (see figure 1) consists of several stages, for example, of the two. 1 the first stage cooling, 2 the second stage of cooling. Each step of cooling is a housing 3 in which is located the inlet pipe 4 made in the form of a zigzag, between the layers of which are of the discharge channels 5. Zigzag pipeline and outlet channels form a zigzag radiator. Also in the case are blowing fan 6 and the induction motor 7. The cooling stage is connected between a direct plot 8 zigzag of the inlet pipeline. Between cooling stages is the valve 9 is opened by the DC motor 10, which is connected through current relay 11 from the temperature sensor 12. The temperature sensor 12 receives information about the technical water from the heater 14 and outputs the signal to the frequency Converter 13.

The device operates as follows. Process water from the heater 14 enters the first stage cooling 1 on zigzag radiator. The coolant passes quickly zigzag pipe 4, being a small cooling and slow the passage of downstream channels 5 gives the best cooling, the AK as area increases, contact with the stream of air coming from the blower fan 6. The coolant is forcibly cooled by the blower fan 6 driven induction motor 7 and fed from the frequency Converter 13. If the temperature of the water corresponds to the specified limit, the valve 9 remains closed, and the water, after passing the first stage cooling 1 is returned to the heater 14. Information on the coolant temperature indicates the temperature sensor 11, an outstanding standard a 4-20 mA which is located behind the heater 14. If the sensor 12 sends a signal about the water temperature, the value of which exceeds the defined limit, current relay 11, the contact SQ1 (see figure 2). After this voltage is independent of the excitation winding of the DC motor 10. In turn, the engine 10 opens the valve 9, thus, the process water is fed to the second stage cooling 2. In turn, reacting to the change of a signal from the temperature sensor 12, the frequency Converter 13 specifies the asynchronous motor 7 speed with which you want to rotate the blowing fan 6. The speed of rotation of the blower fan 6 depends on how much the water temperature exceeds the preset limit, since at small expansion is a necessity in the operation of the blower fan 6 at full capacity disappears. If the coolant temperature will increase, and the speed of rotation of the blower fan 6 will increase, increasing the speed and force of the air stream. When passing through the second stage 2 size of the impact on the coolant air flow increases. From the above it follows that the temperature change with the passage of the second stage 2 will correspond to the value below the specified limit.

Depending on the needs of the enterprise, the number of cooling stages can be increased. Thus, the water temperature will be maintained to the extent necessary.

The technical result is reflected in the fact that due to the presence of several stages of cooling and control systems receive the cooled fluid to the desired temperature. Directing the flow of air blowing fan directly on the zig-zag radiator, increases the efficiency of heat transfer. The existence in the system of the frequency Converter provides efficient cooling and reducing energy consumption by regulating the speed of rotation of the blower fan.

Industrial applicability is that the device can be easily manufactured on standard equipment for any production method: serial or mass.

Heat transfer apt the rat, comprising a housing and a supply line with a cooled fluid, characterized in that, to improve the heat from the coolant that is used by several cooling stages, each of which is made in the form of sections containing zigzag radiator, blower fan to provide air flow directly on the zig-zag lead pipe, and outlet channels, and control of the flow rate of the cooling air generated by the blower fan is performed by using an asynchronous motor fed and controlled by a frequency Converter depending on a signal from the temperature sensor installed after the heater, connect the additional step of cooling is performed using automatic systems temperature control of cooling water, the signal coming from the temperature sensor, the effect on the relay limit current exceeds a given value which relays and their contacts includes an actuator opening additional stage of cooling, the opening is performed by a DC motor.



 

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