KR101707191B1 - Heating and circulation system for engine cooling water of a ship using electric heater - Google Patents

Abstract

The present invention relates to a heating and circulation system for engine cooling water of a ship which can perform normal operation of a main engine by supplying the cooling water to the main engine during sailing of the ship, and can perform warming preventing thermal shock damage of a combustion cylinder of the main engine by heating the cooling water supplied to the main engine at a fixed temperature during mooring of the ship. More specifically, the present invention relates to the heating and circulation system for the engine cooling water of the ship which can reduce the amount of fuel oil consumed and the amount of a greenhouse gas generated maximally as compared to a prior engine warming method of generating steam by supplying the fuel oil to a boiler during mooring of the ship, by: installing an electric heater heat exchanger instead of a steam heater heat exchanger on a supply line supplying the cooling water to the main engine via a circulation pump from an expansion tank; connecting the electric heater heat exchanger and the steam heater heat exchanger in parallel; on the other hand, installing a temperature control valve on a return line discharging the cooling water to the expansion tank via the main engine; and controlling temperature of the cooling water directly by extending the return line from the temperature control valve and connecting the extended return line to an intake (entrance) side of the circulation pump or using a temperature controller installed on the electric heater heat exchanger itself. Also, the heating and circulation system of the engine cooling water of the ship can prevent energy waste due to heat loss of the cooling water by shortening a circulation path of the cooling water in a manner of supplying the cooling water to the circulation pump directly without collecting the cooling water into the expansion tank in accordance with temperature condition of the cooling water discharged via the main engine.

Description

TECHNICAL FIELD [0001] The present invention relates to a heating and circulation system for a ship engine cooling water using an electric heater,

In the present invention, cooling water is supplied to the main engine to enable normal operation of the main engine when the ship is to be operated, while cooling water is introduced into the electric heater heat exchanger before the cooling water is supplied to the main engine, To a heating and circulation system of a marine engine coolant for performing a warming operation to prevent a thermal shock damage of a main engine combustion chamber leader by allowing the main engine cylinder chamber to be heated to a predetermined temperature and then sent to the main engine.

Generally, the oil of the heavy oil used for the fuel oil of the marine engine has a lower fluidity than the diesel oil and the ignition point is very higher than that of the diesel oil. Therefore, the fuel oil for the ship is heated to a certain temperature to satisfy the viscosity (fluidity) In order to achieve this, a fuel oil heating system using steam at a high temperature is installed on a ship.

1, a high-temperature exhaust gas discharged from a main engine is supplied to a steam generator to generate steam, and the generated steam is supplied to a steam generator The fuel oil supplied to the main engine and the generator is heated to a predetermined temperature and heated in a living area such as a cabin or heated water can be supplied.

On the other hand, at the time of berthing of the ship, fuel oil is supplied from the service tank storing the engine fuel oil to the boiler to generate steam, and by heating the fuel oil supplied to the main engine and the generator using the steam thus generated, In addition, it prevents the fuel oil fixing and the fuel oil supply system from being fixed, and at the same time, the generator is operated to produce the necessary electricity during mooring. In order to quickly re-operate the ship, the heating operation of various oil tanks, The steam heating method using a boiler is applied to the heating and hot water supply necessary for a residence area such as a cabin during an anchorage as well as a warming operation of a main engine and a generator by heating.

However, when the boiler is operated using the fuel oil at the time of berthing of the ship, an excessive amount of fuel oil consumed from about 1.5 to 2 tons per day is consumed, and in addition, various kinds of air pollutants NOx, SOx, CO _2, etc.) are emitted in large quantities, causing pollution of the environment. This is because, from the point of view of the international convention on the recently enacted carbon trading scheme, .

In addition, since all the heating, engine preheating, and heating and hot water supply required for the berthing of the ship depend on the operation of the boiler, a large boiler must be installed in the narrow inner space of the ship, And the continuous operation of the boiler causes frequent breakdown and shortening of the life of the boiler equipment, and the cost of repairing and maintenance of the boiler equipment and replacement of the boiler equipment is also increased.

The present invention can solve the problems of the conventional heating system as described above, and it is an object of the present invention to solve the problems of the conventional heating system, Wherein said oil recovery system comprises a circulation system for returning oil to said fuel tank, wherein said heat exchanger heater is a ship heavy oil service for use together with an electric heater heat exchanger using electricity generated from a ship generator and a steam heater heat exchanger using steam generated by a boiler A system for maintaining the temperature of a tank is known from Korean Patent Laid-Open Publication No. 10-2012-0039154 (published on Apr. 25, 2012).

According to the conventional temperature maintenance system for the heavy oil service tank, when the ship is operated, the fuel oil is heated by the steam generated by using the exhaust gas of the main engine as in the conventional case, The fuel oil discharged from the tank is sent to the electric heater heat exchanger to heat the fuel oil and then stored in the fuel tank to be supplied to the required use place so that the amount of consumption of the fuel oil and the amount of the air pollutant Reduce the amount of generation, shorten the operating time of the boiler, and prolong the service life of the equipment and reduce the maintenance cost.

However, the conventional temperature maintenance system of the heavy oil service tank only provides a way of heating the fuel oil stored in the fuel tank with the electric heater and circulating and storing the fuel oil back to the fuel tank, and it is necessary to warm the main engine In order to perform the warming operation of the main engine by heating and circulating the cooling water, it is necessary to generate the steam by burning the fuel oil in the boiler, and then supply the steam to the cooling water circulation pipe The existing method of sending to the installed steam heater heat exchanger was adhered to.

Accordingly, there is a problem in that the operation of the boiler for supplying steam is minimized by minimizing the consumption amount of the fuel oil and the emission amount of the air pollutant by only the temperature maintenance system of the conventional tank heavy oil service tank, In the conventional cooling water heating and circulation system using the heater heat exchanger, all the cooling water discharged from the main engine is recovered to the main engine through the circulation pump and the heat exchanger, and the entire circulation path The heat loss of the cooling water through the piping line and thus the energy waste are somewhat increased.

Korean Patent Publication No. 10-2012-0039154

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a heating and circulating system for a ship engine cooling water using an electric heater, An electric heater heat exchanger is installed in place of the conventional steam heater heat exchanger or an electric heater heat exchanger is connected and installed in parallel with the steam heater heat exchanger and on the recovery line for discharging the cooling water to the expansion tank via the main engine, A control valve is provided and a return line is extended from the temperature control valve so as to be connected to the intake (inlet) side of the circulation pump or the temperature of the cooling water is directly controlled using a temperature controller mounted on the electric heater heat exchanger itself, Conventional engine that generates steam by supplying fuel oil to the boiler at the time of berth The amount of fuel consumption and the amount of greenhouse gases generated are reduced as much as possible, and the temperature of the cooling water discharged through the main engine is directly supplied to the circulation pump without being collected in the expansion tank, The main technical problem is to reduce the energy waste due to the heat loss of the cooling water by shortening the path.

According to the present invention as a means for solving the above technical problems, a supply line of cooling water extending from a expansion tank through a circulation pump is connected to a main engine, and a recovery line extending from the main engine is expanded And a discharge line extending from the cooling device through the temperature control valve is connected to the supply line and the circulation pump at a previous position of the circulation pump, And a bypass line extending from the temperature control valve is connected to the inflow line, and each of the piping lines is provided with a circulation system for the marine engine cooling water having an on-off valve and a check valve for adjusting the flow path of the cooling water So that the corresponding supply line between the circulation pump and the main engine A heat exchanger is connected to the steam heater heat exchanger, or an electric heater heat exchanger is connected in parallel with the steam heater heat exchanger, and the inlet pipe line and the outlet pipe line of the heat exchanger are respectively provided with open / close valves, Closing valve is also provided on a corresponding supply line between the inlet-side pipeline line and the outlet-side pipeline line, and a temperature control valve is provided in the recovery line before the inflow line for the cooling device is branched, The return line extending from the control valve is connected to the supply line at a suction (inlet) side position of the circulation pump, the electric heater heat exchanger has a built-in temperature controller for controlling the heating temperature of the cooling water, And the generator is connected to the engine fuel tank main tank An electric heater heat exchanger for heating the fuel oil is connected to the steam heater heat exchanger on the piping line for supplying the fuel oil from the service tank to the generator and is operated by receiving the fuel oil stored in the service tank via the settling tank and the purifier. And is connected and installed in parallel.

According to the present invention, the amount of consumption of the fuel oil and the amount of air pollutants discharged can be greatly reduced by replacing the warming operation of the main engine, which was entirely dependent on the operation of the boiler when the ship is docked, with the electric heater heating method. It is possible to efficiently utilize the space inside the ship and to reduce the cost for repairing and maintenance of the boiler facility.

Particularly, by adopting the flow control method of feeding the cooling water to the intake (inlet) side of the circulation pump in accordance with the temperature condition of the cooling water discharged through the main engine, the circulation path of the cooling water is shortened and the heat loss of unnecessary cooling water And the heating load of the electric heater heat exchanger is reduced, so that the warming operation of the main engine can be stabilized within a shorter time.

Ultimately, by making it possible to utilize the electric heater heating system in a reasonable and economical way throughout the heating system used at the time of berthing of the ship, it is possible to maintain the berth more stable and to re- It is very beneficial to obtain sufficient external competitiveness both in terms of national and enterprise from the point of view of the international agreement on the emission trading system.

FIG. 1 is an explanatory diagram of an existing heating system used when a ship is in operation and at a berth. FIG.
2 is a detailed piping diagram of a heating and circulation system for a ship engine cooling water using an electric heater according to the present invention.
3 is an explanatory view showing a state in which the system of the present invention is associated with a marine fuel oil circulation system;

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 2, the heating and circulating system for the ship engine cooling water using the electric heater according to the present invention comprises an expansion valve 1 (V: ball valve is preferred) from the expansion tank 1 connected to the water supply line 1a, A supply line 1b for supplying cooling water extending through the circulation pump 2 is connected to the main engine 5 and a recovery line 5a for cooling water extending from the main engine 5 is connected to the on- And the circulation route is connected to the expansion tank 1 via the circulation route.

The expansion tank 1 recovers the high temperature cooling water discharged from the main engine 5 and removes the expansion pressure of the cooling water so that the internal pressure of the closed piping line constituting the cooling water circulation system 10 is maintained at a constant level, Thereby preventing leakage of the water through the connection portion of the line and breakage of the piping line while separating the gas component or foreign matter which is dissolved in the cooling water causing corrosion and scale of the piping line from the cooling water.

The circulation pump 2 uses a product having a discharge pressure of about 2 to 3 kgf, and a total of two pumps including one spare pump are connected in parallel on the supply line 1b Closing valve V for replacement use of the circulation pump 2 is provided in the piping line on the suction side of each circulation pump 2 so that the discharge of the circulation pump 2 Outlet) side piping line is provided with a check valve (CV) for preventing the reverse flow of the cooling water.

In addition, the inflow line 6a is branched from the recovery line 5a, and the inflow line 6a is connected to the inlet of the cooling device 6 via the on-off valve V. The cooling device 6 Is connected to the supply line 1b at the previous position of the circulation pump 2 so that the high temperature cooling water discharged from the main engine 5 at the time of operation of the ship is cooled by the cooling device (6) to form low-temperature cooling water, which is then re-supplied to the main engine (5).

The above configuration also corresponds to the basic route applied to the ship cooling water circulation system 10. A temperature control valve TCV is additionally installed in the discharge line 6b at a position past the opening / closing valve V, The bypass line 6c extending from the temperature control valve TCV is connected to the inlet line 6a at the previous position of the valve V so that the temperature of the cooling water discharged through the cooling device 6 becomes If the required level is not satisfied, the cooling water is supplied to the cooling device 6 via the bypass line 6c and the inflow line 6a according to the operation of the temperature control valve TCV.

The electric heater heat exchanger 4 is connected to the steam heater heat exchanger 3 and the steam heater heat exchanger 3 in the corresponding supply line 1b between the circulation pump 2 and the main engine 5, The conventional steam heater heat exchanger 3 may be installed in the same manner as the conventional steam heater heat exchanger 3 as described above and the existing steam heater heat exchanger 3 may be installed in the electric heater It is also possible to replace (replace) the heat exchanger 4.

In the former case, the installation space of the heat exchanger is increased. However, it is advantageous that the steam heater heat exchanger 3 is temporarily activated when the electric heater fails or malfunctions to perform the warming operation of the main engine 5 In the latter case, however, the installation space of the heat exchanger can be reduced. However, if a failure or malfunction of the electric heater occurs, it is difficult to perform the warming operation of the main engine 5 until the repair is performed have.

When the steam heater heat exchanger 3 and the electric heater heat exchanger 4 are connected in parallel to each other as shown in Fig. 2, the heat exchanger 3 and the heat exchanger 3 Closing valve (V) for the replacement use of the heat exchangers (3) and (4), and a corresponding supply line (V) is provided between the inlet piping line and the outlet piping connection of the heat exchangers 1b are provided with an on-off valve V for selecting and adjusting the flow path of the cooling water to the main engine 5 or the heat exchangers 3, 4 side.

The steam heater heat exchanger 3 is a multi-tube heat exchanger in which a plurality of heat exchange pipes, in which steam flows, are inserted into a heat exchange tank having an inlet port and a discharge port for cooling water, A typical example is a shell & tube type heat exchanger or a shell & fin-tube type heat exchanger. The electric heater heat exchanger 4 includes a heat exchange tank having an inlet port for cooling water and an outlet port And a plurality of electric heater rods, preferably a sheath heater, are inserted in parallel at regular intervals.

However, it is clear that any type of electric heater heat exchanger 4 can be applied as long as the cooling water can be heated by the electric heating method. The electric heater heat exchanger 4 is connected to the generator , The generator can supply the fuel oil even during berths of the ship to produce the required power separately.

A temperature control valve TCV is provided in the recovery line 5a before the inflow line 6a for the cooling device 6 is branched, A return line 5b extending from the valve TCV is connected to the supply line 1b at the suction (inlet) side position of the circulation pump 2 and a temperature capable of controlling the heating temperature of the cooling water It is also possible to embed the controller in the electric heater heat exchanger 4 itself.

In other words, until the temperature of the cooling water discharged from the main engine 5 rises above the set value and the expansion pressure needs to be removed, that is, before the point at which the warming is performed to the level required by the main engine 5, To the circulation pump 2 without returning to the expansion tank 1 to shorten the heating and circulation path of the cooling water so as to prevent unnecessary heat loss in the piping line and thus waste of energy, , The heating load of the electric heater heat exchanger (4) is reduced, and the warming operation of the main engine (5) can be stabilized as quickly as possible.

Hereinafter, the operation of the cooling water circulation system 10 according to the present invention will be described in detail as follows.

First, during operation of the ship, cooling water is supplied from the expansion tank 1 to the main engine 5 through the circulation pump 2 to enable normal operation of the main engine 5, Temperature cooling water is recovered to the expansion tank 1 to remove the expansion pressure and gas components while the remaining high temperature cooling water is sent to the cooling device 6 to cool the expansion tank 1 and the cooling device 6, The cooling water is supplied to the main engine 5 via the circulation pump 2 again.

When the main engine 5 is normally operated during the operation of the ship according to the circulation of the cooling water as described above, the temperature of the high temperature cooling water discharged from the main engine 5 becomes at least 80 ° C, And the temperature control valve TCV to the return line 5b does not occur and the entire amount thereof flows through the temperature control valve TCV to the cooling device 6 and the expansion tank 1 side Respectively.

On the other hand, at the time of berthing of the ship, the cooling water supplied from the expansion tank 1 through the circulation pump 2 is introduced into the electric heater heat exchanger 4 through the flow adjusting work using the opening / closing valve V and heated The main cooling water is supplied to the main engine 5 to perform a warming operation to prevent thermal shock damage to the combustion cylinder of the main engine 5. The heating cooling water discharged from the main engine 5, Is supplied to the circulation pump 2 at the beginning of the operation and then to the expansion tank 1 side and the temperature of the cooling water can be maintained at all times when the temperature controller is incorporated in the electric heater heat exchanger 4 itself

By replacing the warming operation of the main engine 5, which relied solely on the operation of the boiler at the time of berthing of the ship, with the electric heater heating method in the above-described manner, the consumption amount of the fuel oil and the discharge amount of the air pollutant can be greatly reduced, As the facility is miniaturized, it is possible to utilize the space inside the vessel efficiently, and the cost for repairing and maintenance of boiler facilities can be reduced.

Particularly, by applying the flow regulation system that sends the cooling water to the intake (inlet) side of the circulation pump 2 in accordance with the temperature condition of the heating cooling water discharged through the main engine 5, the circulation path of the cooling water is shortened, It is possible to prevent unnecessary heat loss of the cooling water and energy waste associated therewith and reduce the heating load of the electric heater heat exchanger 4 so that the warming operation of the main engine 5 can be stabilized in a shorter time .

As described above, a method of operating the generator in the manner of supplying electric power to the electric heater heat exchanger 4 used for the warming operation of the main engine 5 must be linked to the marine fuel oil circulation system, The fuel oil circulation system 20 corresponds to a system for supplying the fuel oil stored in the service tank from the engine fuel main tank to the main engine 5 and the generator via a settling tank and a purifier, In FIG. 3, it is to be noted that the illustration of the line for supplying the fuel oil from the service tank to the main engine 5 is omitted in order to avoid the complexity and cross-talk of the drawings.

Needless to say, even when fuel oil is supplied to the marine generator, it is necessary to heat the fuel oil to a predetermined temperature to satisfy the viscosity and ignition point required for the generator. Therefore, the existing fuel oil circulation system is also supplied with fuel oil from the service tank to the generator A steam heater heat exchanger is installed on the piping line, and an electric heater heat exchanger is connected in parallel with the steam heater heat exchanger on the pipeline line and connected to the generator by a cable (dotted line in the figure) It is advantageous to apply the electric heating method.

Even more preferably, the settling tank is provided with an electric heater so as to use electricity generated by the generator, so that the temperature required for refining the fuel oil can be maintained without using the boiler and the steam heater heat exchanger, This is so that even if the fuel oil of the service tank is consumed by anchoring, the precipitation and refining operation of the fuel oil can be performed quickly and smoothly without operating the boiler.

Ultimately, it is possible to utilize the electric heater heating system throughout the heating system used at the berthing of the ship, from the warming operation of the main engine 5 to the refining and heating and circulation operations of the fuel oil, It is necessary to maintain anchoring and quicker re-operation, and at the same time, to ensure sufficient external competitiveness both nationally and businessly in terms of the international agreement on carbon trading.

1: expansion tank 1a: supply line
1b: supply line 2: circulation pump
3: Steam heater heat exchanger 4: Electric heater heat exchanger
5: main engine 5a: recovery line
5b: return line 6: cooling device
6a: inlet line 6b: exhaust line
6c: Bypass line 10: Coolant circulation system
20: fuel oil circulation system V: opening / closing valve
CV: Check valve TCV: Temperature control valve

Claims (4)

delete delete delete A supply line 1b of cooling water extending from the expansion tank 1 through the circulation pump 2 connected to the supply water line 1a is connected to the main engine 5 and extends from the main engine 5 The recovery line 5a is connected to the expansion tank 1 and the inflow line 6a is branched from the recovery line 5a and the inflow line 6a is connected to the cooling device 6, A discharge line 6b extending from the cooling device 6 via the temperature control valve TCV is connected to the supply line 1b at the previous position of the circulation pump 2 and extends from the temperature control valve TCV The bypass line 6c is connected to the inflow line 6a and circulation of the engine cooling water for ships having the on-off valve V and the check valve CV for adjusting the flow path of the cooling water, In the system,
The electric heater heat exchanger 4 is connected to the supply line 1b between the circulation pump 2 and the main engine 5 alone or the electric heater heat exchanger 4 is connected to the steam heater heat exchanger 4, (3) in parallel,
An on-off valve V is provided on the inlet-side piping line and the outlet-side piping line of the heat exchangers 3 and 4, An on / off valve (V) is also provided on the corresponding supply line (1b) between the connection parts,
A temperature control valve TCV is installed in the recovery line 5a before the inflow line 6a for the cooling device 6 is branched and a return line 5b extending from the temperature control valve TCV (Inlet) side of the circulation pump 2 and connected to the supply line 1b,
The electric heater heat exchanger (4) is provided with a temperature controller for controlling the heating temperature of the cooling water, while the generator is connected to a generator provided in the marine fuel oil circulation system (20) And is supplied with fuel oil stored in the service tank via the settling tank and the purifier from the main tank,
And an electric heater heat exchanger for heating the fuel oil is connected in parallel with the steam heater heat exchanger on the piping line for supplying the fuel oil from the service tank to the generator. system.

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