KR200255883Y1 - Electric Hot Oil Heater - Google Patents

Abstract

The present invention is an electric hot oil heater for preheating raw materials and fuel in an asphalt mixing plant, which is a kind of construction equipment, and the heat medium oil heater for preheating of raw materials and fuel. Oil Heater), or alternately operated with the heater is provided for the purpose of increasing the energy use efficiency; The structure of the present invention, there is a tube forming the outer shape and the inlet and outlet for the inlet and out of the fluid, therein an electric heater comprising a resistance coil for heating the heat medium oil therein; There is an outlet connected to the inlet pipe to the outer shape and includes a tank in which the oil stays to assist in circulation of the thermal medium oil; The electric heater part is enclosed in the tank so that heat exchange is performed between the heat medium oil heated by the electric heater part and the heat medium oil in the tank.

In the conventional thermal medium oil heater, the heat storage caused by the use of a diesel burner, the heat loss caused by the generation of high temperature flue gas (Flue Gas) and the storage tank for the smooth circulation of the thermal medium oil due to its inevitable operation of the copper storage tank Compared with the heat loss in the present invention, the present invention improves the energy utilization efficiency by reducing the production cost of the material (ascon) in the plant by making the storage tank of the thermal medium oil form an envelope having an electric heater.

Description

Electric heat medium oil heater {Electric Hot Oil Heater}

The present invention relates to a hot medium oil heater (Hot Oil Heater) in an asphalt mixing plant.

In asphalt mixing plants, a type of construction industry, a thermal medium oil heater for preheating raw materials (asphalt) and fuel (bunker C oil or heavy oil) has been used for combustion with diesel oil burners. Referring to the conventional system diagram (FIG. 1A) which is the attached drawing about the said heating system, the conveyance piping 5 of a raw material and fuel by the heat medium oil (hereinafter fruit oil) heated by the heat medium oil heater 1 is carried out. Asphalt Scale Tank (5), Asphalt Scale Tank (5), Mixer (5) of Construction Material (Ascon), and the main body (5) and connecting pipes (5) of the plant were preheated, Asphalt as a raw material in 2 and 3 and the bunker C oil in the fuel tank 4 were preheated. The conventional thermal medium oil heater shown in FIG. 4 includes a fruit oil storage tank 41 (hereinafter, a service tank) for smooth circulation of the fruit oil, a diesel oil burner 46 for heating the fruit oil, and a portion of which the fruit oil is heated. The coil 42, the oil pump 45 which circulates fruit oil, the flue 47 for discharge | emission of combustion exhaust gas, the level switch 43 which controls the oil level in a service tank, etc. are comprised.

In the conventional thermal medium oil heater as shown in FIG. 4, the operation of the service tank 41 is inevitable for smooth circulation of the fruit oil, and the surface of the service tank is kept at a high temperature due to its structure, and the insulation of the tank is avoided. Therefore, there is a problem in that the heat loss from the service tank 41 surface and the flue 47 to the atmosphere is large. In particular, the conventional heat medium oil heater generates a high temperature flue gas by using a diesel oil burner 46 to heat the fruit oil, resulting in high energy utilization efficiency due to heat loss to the atmosphere through the exhaust gas. There was a low issue.

An object of the present invention for solving the above problems is to place the electric heater unit 17 for heating oil in the electric hot oil oil tank (Electric Hot Oil Heater) tank 13, the outside of the tank 13 By insulating with the heat insulator 14, the energy utilization efficiency is increased; By simply implementing the structure of the electric heater unit 17 and the electric thermal medium oil heater 13, repair and operation are easy; It is also an object of the present invention to provide an enveloping type electric thermal medium oil heater that can reduce labor by automating the control of the heating device.

1A is a schematic conceptual diagram of a conventional heating scheme.

1B is a schematic conceptual view of a heating system to which the present invention is applied.

1C is a longitudinal and cross sectional view of a raw and fueled pipe.

Figure 2a is a schematic layout showing an electric hot oil heater (Electric Hot Oil Heater) according to the present invention.

FIG. 2B is a top view (top view) of FIG. 2A seen from above; FIG.

FIG. 2C is an external side view of FIG. 2A seen from the right side; FIG.

Figure 3a is a schematic internal layout of the electric heater (Electhc Heater Assembly) in the present invention.

FIG. 3B is a sectional view of FIG. 3A seen in the X direction. FIG.

3C is a cross-sectional view of FIG. 3A seen in the X 'direction.

4 is an exterior and interior layout of a conventional hot oil heater.

5 is a conceptual diagram of a heating scheme according to an embodiment in which an electric hot oil heater of the present disclosure is implemented.

* Description of the symbols for the main parts of the drawings *

1: conventional thermal medium oil heater

2: raw material storage tank A (large asphalt tank)

3: raw material storage tank B (medium or small asphalt tank)

4: fuel (bunker C oil or heavy oil) storage tank

5: raw material conveying piping and other equipment

6: heat medium oil circulation

7: electric heat medium oil heater of the present invention added to the conventional heating system

8, 14: heat insulating material 9: heat medium oil

10: raw material and fuel 11: inflow pipe

12: heat medium oil oil

13: electric heat medium oil heater tank in the present invention

15 discharge port 17 electric heater unit in the present invention

18: thermal medium oil flow control panel

19, 35: Thermocouple

20: inflow pipe to the main body of the electric heater in the present invention

21: Drain 22: Vent & Overflow

24: longitudinal resistance coil 25, 43: level switch

26: Level Gauge

27: Flange 28: Pulley

29: oil level upper limit limit switch

30: Float Cylinder

31: flow rate gauge weight 32: oil level recognition lower limit limit switch

33: Vent Port 34: Temperature Switch

36: radiating fins 37, 38, 39, 40: resistance coil in the transverse direction

41: service tank 42: thermal medium oil coil

44: piping line to heat medium oil circulation

45: heat medium oil pump 46: diesel burner

47: year

48: An implementation part of the present invention in a conventional heating system

49: electric heater body 50: connection piping

A feature provided by the present invention for achieving the above object is to be in the form of a shell to allow heat exchange from the fruit oil in the electric heater unit body 49 to the fruit oil in the electric heat medium oil heater tank 13, The electric heater 17 is located in the heat medium oil heater tank 13 and is connected in the form of a flange so that it can be separated from the heat medium oil heater tank.

Another feature of the present invention for achieving the above object is that the electric heater further includes a control panel for controlling the flow direction of the heat medium oil therein for smooth circulation of the heat medium oil.

In another aspect of the present invention, the electric heater unit measures the temperature of the heat medium oil inside the copper heater unit, controls the temperature of the copper medium oil, and the temperature information is a logic circuit of a predetermined automatic control panel ( A predetermined thermocouple to the outside of the copper electric heater unit 17 so as to be fed back to the control circuit) to control the on-off of the resistance coil 24 step by step. It is to control the blinking of the electric heater part according to the temperature of the heat medium oil in the heater part main body 49, and to make the temperature switch 34 for alerting off hangs outside the electric heater part main body.

Another feature of the present invention for achieving the above object, the electric heater, during the initial filling of the oil into the electric heater unit body 49, vent for discharging air and steam in the sealed space inside the electric heater unit body 49 It is intended to include a line 33 (Vent Line).

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1A is a schematic system diagram of a heating scheme in which a conventional thermal medium oil heater is implemented. FIG. 1B is a schematic system diagram of a heating scheme showing an example in which the electric thermal medium oil heater of the present invention is added to FIG. 1A, and an arrow indicates a moving direction of heat. FIG. 1C is a longitudinal and transverse cross-sectional view of a jacketed pipe to show preheating of the raw material and fuel on the raw material and fuel delivery piping.

FIG. 2A is an external and internal layout view of the electric thermal medium oil heater of the present invention, in which only a portion of the resistance coil 24 is shown, not the whole. FIG. 2B is a top view (top view) of FIG. 2A, and FIG. 2C is a right side view of FIG. 2A. 3A is a longitudinal cross-sectional view of the electric heater unit and the same heater unit body, FIG. 3B is a cross-sectional view of FIG. 3A seen in the X direction, and FIG. 3C is a sectional view of FIG. 3A seen in the X ′ direction.

4 is an inner view and an external view of the entire assembly of a conventional thermal medium oil heater in which a diesel oil burner is used as a heating device, and FIG. 5 shows an example in which the electric thermal medium oil heater of the present invention is implemented in an asphalt mixing plant. It is an embodiment.

In the figure, there is a level switch 25 which controls the height of the fruit oil oil level in the tank 13 at the upper limit (L.H in FIG. 2A) and the lower limit (L.L) of the tank oil level; Level gauge (26) consisting of a cylindrical float (30, Float Cylinder) moving along the height of the oil level and a flow gauge weight (31) moving up and down in accordance with the movement of the buoy connected to the wire through the pulley (28) ), The height of the fruit oil oil level in the tank is visualized. Then, at the oil level limit lower limit (LLL in Fig. 2A), the oil level recognizing lower limit limit switch 32 which issues a supplemental instruction warning of the fruit oil to the tank and cuts off the power supply to the electric heater unit at the same time; The oil level (45 in FIG. 5) is stopped by operating the oil pump (45 in FIG. 5) at the oil level limit upper limit (LHH) in the drawing, and the oil level upper limit limit switch 29 is notified to the plant operator. Doing.

Meanwhile, a vent overflow line 22 to prevent the overflow of the fruit oil to the outside of the tank, which may be caused by the higher flow rate of the fruit oil inside the tank than the oil level corresponding to the oil level upper limit switch value. It includes; A drain port 21 for depositing impurities contained in the fruit oil is included at the bottom of the tank.

Located on the pipe 50 connecting the copper drain port 21 and the inlet of the electric heater, the temperature of the fruit oil in the tank is measured, and the copper circuit information of the automatic control panel is controlled. Circuit), and the temperature of the fruit oil is, for example, 140 ° C. or less (preferably this value) under the instruction of the logic circuit according to the same temperature information. Thermocouple 19 for operating two resistance coil groups 37 and 39 at the same temperature between 140 ° C. and 160 ° C., and operating one resistance coil group 37 at the same temperature above 160 ° C. It includes.

And a flange 27 for coupling the electric heater unit 17 to the electric thermal medium oil heater tank and allowing it to be detached when repairing the breakdown of the electrokinetic heater unit; While the fruit oil flowing into the electric heater unit body 49 flows along the heat medium oil flow direction control panel 18 inside the copper body, the calorific value has a constant value per unit area so that the copper fruit oil is heated without boiling. The array comprises an electric heater 17 formed at a predetermined interval, the resistance coil being a non-heating portion up to a certain distance from the flange 27 for separation and support.

In order to smoothly flow the fruit oil, upper and lower cross sections (up and down in FIG. 3B) of the electric heater part main body 49 at the site where the inflow pipe into which the fruit oil flows into the electric heater part and the outlet pipe from the heater part are located are convexly inflated. It is made of; Vent line 33, which is a pipe for discharging air in the upper sealed space when the oil is initially filled into the electric heater unit body 49, is located on the discharge port 15 through which the fruit oil exits from the electric heater unit body. ) Is included. It is installed outside the electric heater unit main body 49, measures the temperature of the heat oil in the electric heater unit main body, inputs the temperature information into another logic circuit (heating operation circuit) of the automatic panel, and the same logic circuit A thermocouple 35 for alarming the plant driver under control of a controller associated with the controller; To prevent fire or damage to the device which may occur due to overheating and overcooling of the fruit oil in the electric heater part, cut off the power to the electric heater part under the control of the controller connected to the logic circuit (heating operation circuit), And a temperature switch 34 to alert the plant operator of the situation. On the other hand, a heat sink 36 for assisting heat exchange from the electric heater unit body 49 to the heat flow path in the tank 13 is included outside the electric heater unit body 49.

Thus, the fruit oil enters the input line 11, enters the tank 13 of the electric thermal medium oil heater, and the flow rate of the inflow fruit oil is visualized by the level gauge 26. Then, the flow rate of the heat oil in the tank 13 for proper operation of the electric thermal medium oil heater of the present invention is controlled between the upper limit L.H and the lower limit L.L by the level switch 25. Impurities contained in copper fruit oil precipitate at the drain on the drain pot.

The temperature of the copper oil by the thermocouple 19 located on the pipe while the filtered fruit oil flows through the pipe 50 connecting the drain and the electric heater part main body 49 (electric heat medium oil heater). The temperature of the fruit oil in the tank) is measured, and the blinking of the resistance coil 24 groups of the electric heater unit 17 is controlled step by step in accordance with the measured temperature. Subsequently, the fruit oil is heated by the plurality of resistance coils 24 while flowing in the electric heater unit body 49.

At the same time, in order to increase energy utilization efficiency and heat exchange efficiency, the copper oil is heat-exchanged with the fruit oil in the electric heat medium oil heater tank 13 through the exterior of the electric heater unit 49. In addition, the fruit oil temperature in the electric heater part main body 49 heated by the electric heater part is measured by the thermocouple 35 and the temperature switch 34, and the same temperature information (temperature of the fruit oil in the electric heater part main body) In accordance with the above method, the blinking of the electric heater is controlled, and an alarm is issued to the driver of the present invention.

The fruit oil heated by the electric energy in the electric heater unit 17 moves to the fruit oil circulation destination 6 through the discharge port, and after heat exchange with each device, raw materials and materials, When it enters into the tank through the inflow pipe 11, the fruit oil will become a one-shot of the asphalt mixing plant for heat exchange by this invention.

As described above, if the present invention is added to the asphalt mixing plant and operated properly alternately, or if the present invention is applied to a new plant facility, the electric heater part (heating part) is inserted into the electric heat medium oil heater tank 13, thereby saving energy. As it has the effect of increasing the efficiency of use, it is possible to greatly reduce the production cost of ascon material. In addition, it is easy to repair the structure of the boiler in the asphalt mixing plant, and the labor can be reduced by automating the operation of the boiler.

Claims (9)

In the Asphalt Mixing Plant, there is a tube that forms an outer shape and forms an inlet and an outlet for entering and exiting a fluid, and an electric heater unit 17 including a resistance coil therein for heating a thermal medium oil therein. Wow; There is an outlet connected to the inlet pipe to the electric heater unit 17, and includes a tank 13 in which the oil stays to assist with circulation of the thermal medium oil; The electric heater 17 is included in the tank 13 through a connecting device so that the tank 13 is in the form of an envelope containing the electric heater, and the heater 17 is Located inside the thermal medium oil heater tank (13), but connected in a flange form so as to be separated from the thermal medium oil heater tank; The electric heat medium oil heater tank is characterized in that the level switch 25 for controlling the flow rate of the heat medium oil in the tank is included in the tank. The electric heat medium oil heater according to claim 1, wherein the electric heater part further includes a control panel for controlling a flow direction of the heat medium oil therein for smooth circulation of the heat medium oil. 2. The electric heater unit according to claim 1, wherein the electric heater unit adds a predetermined thermocouple for measuring the temperature of the heat medium oil inside the electric heater unit to the outside of the electric heater unit 17; And an electric temperature medium oil heater connected to a logic circuit (control circuit) of a predetermined automatic control panel which controls the blinking of the plurality of resistance coils 24 so as to provide feedback. 4. The electric heater according to claim 3, wherein the electric heater controls the blinking of the electric heater part in accordance with the temperature of the heat medium oil in the electric heater part main body 49, and a temperature switch 34 for alerting the electric heater is used. An electric heat medium oil heater, characterized in that it is external to the secondary body. The vent heater 33 of claim 1, wherein the electric heater part comprises a vent line 33 for discharging air and steam in an airtight space inside the electric heater part body when initial oil is filled into the electric heater part body 49. An electric thermal medium oil heater, characterized in that it is further included. The method of claim 1, wherein the electric heater, characterized in that the convexly inflated portion of the tube forming the outlet and the inlet of the oil in the heater for the smooth flow of the heat medium oil to the body of the heater. Electric heat medium oil heater. 2. The drain according to claim 1, wherein a drain (21) for sedimenting impurities contained in the copper thermal medium oil is located at the bottom of the electric thermal medium oil heater tank (13), and the oil outlet from the copper tank passes through the copper drain. An electric thermal medium oil heater, characterized in that consisting of. 8. The electric thermal medium oil heater of claim 7, wherein a thermocouple is included in the piping connected to the drain to control the temperature of the heat medium oil in the electric heat medium oil heater tank. 2. The electric heat medium oil heater tank according to claim 1, wherein the electric heating medium oil heater tank visualizes the oil level of the heat medium oil in the copper tank, and flashes the oil pump 45 and the electric heater 24 and the associated valves according to the oil oil level. An electric heat medium oil heater, characterized in that the level gauge (26) is attached to the inside and the outside of the tank to control the opening and closing.