JPH0141081Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of application of the invention] This invention relates to a device for heating water for hot water supply in ships, etc. by using the surplus heating medium of the exhaust gas heating medium heater that uses the exhaust gas of the main engine. It is.

[Prior art and problems] Traditionally, from the perspective of energy conservation, the heat source for ships has mostly been the exhaust gas from the main engine, but water heating equipment requires a heat source even when the ship is at anchor and the main engine is stopped. In Japan, a system was adopted in which fuel was used separately both during the voyage and when the ship was at anchor, without using the exhaust gas from the main engine. Therefore, during a voyage, heating medium heaters that use exhaust gas from the main engine generate surplus heating medium because the amount of heat in the exhaust gas is large compared to the amount of load, while equipment that does not use exhaust gas from the main engine, such as hot water supply equipment, requires This resulted in an uneconomical increase in the amount of fuel that had to be used.

[Purpose and outline of the invention] In view of the above points, this invention connects the exhaust gas heating medium heater outlet that uses exhaust gas as a heat source and the load inlet with a heating medium supply line, and connects the exhaust gas heating medium heater return port and the load outlet. A heater using the heat medium of the exhaust gas heat medium heater as a heat source, an external burner, and a second heat medium sealed in a vacuum and heated by these are connected by a heat medium return line, and in the middle of this heat medium return line, In addition to installing a vacuum hot water boiler equipped with a hot water heater and a hot water receiver heated by this heating medium, a solenoid valve is inserted that closes when such a vacuum hot water boiler is in operation and opens when it stops. A solenoid valve is provided in a heating medium return line upstream of the vacuum hot water boiler, a temperature sensor is provided in the vacuum hot water boiler, and a signal from the temperature sensor is discriminated and the signal is detected. The surplus heat medium utilization device is characterized in that it is provided with a controller that opens and closes the solenoid valve and issues a signal to start and stop the burner according to the operation of the main engine. The second heating medium of the vacuum hot water boiler is heated using the excess heating medium of the heater and an external burner, and when the main engine is stopped, the external burner installed in the vacuum hot water boiler itself heats it by combustion. The purpose of this system is to make it possible to supply hot water regardless of whether the main engine is running or not, and to make effective use of the exhaust gas heat from the main engine.

[Example of the invention] The following will be explained based on the drawings. Fig. 1 shows the following:
This is a flow sheet showing an example of this invention. In the drawings, reference numeral 1 denotes an exhaust gas heat medium heater that utilizes exhaust gas heat from a main engine 13 used in ships and the like. 2 is the load of the exhaust gas heat medium heater,
The heat medium outlet of the exhaust gas heat medium heater 1 and the load 2 inlet are connected by a heat medium supply line 3, and the heat medium return port of the exhaust gas heat medium heater 1 and the load 2 outlet are connected by a heat medium return line 4. connected. 9 is a vacuum type hot water boiler, and this vacuum type hot water boiler includes a heater 5 using the heat medium of the exhaust gas heat medium heater 1 as a heat source.
An external burner 6, a vacuum-sealed second heating medium 7 heated by these, and a hot water supply heat receiver 8 heated by this are provided. The vacuum hot water boiler 9 is installed in the heat medium return line 4. A solenoid valve 10 is provided in the heating medium return line 4 upstream of the vacuum hot water boiler. 11 is a temperature sensor provided on one side of the vacuum hot water boiler; 12 is a controller;
1. The solenoid valve 10 and the external burner 6 are connected by a signal line, and the signal from the temperature detector 11 is discriminated, and the solenoid valve 10 is opened and closed according to the signal to operate and stop the external burner 6. It is configured to allow A solenoid valve 14 is connected to a bypass circuit 15 provided in the heat medium return line 4, and is closed when the vacuum hot water boiler is in operation and opened when the vacuum hot water boiler is stopped.

Next, the operation will be explained according to the drawings. First, during operation of the main engine 13, a heat medium is heated by the exhaust gas in the exhaust gas heat medium heater 1, and this heat medium is supplied to the load 2 through the heat medium supply line 3. A closed circuit is formed in which the heating medium that has released its retained heat on the load 2 side is recovered to the exhaust gas heating medium heater 1 through the heating medium return line 4. At this time, when the vacuum hot water boiler 9 provided in the heat medium return line 4 is operated, the controller 12 receives a signal from the temperature sensor 11, opens the solenoid valve 10, and operates the external burner 6. By operating the electromagnetic valve 10 and the external burner 6 at this time, the second heating medium 7 is heated, and the hot water supply heat receiver 8 receives heat and becomes ready for hot water supply.
Furthermore, when the temperature of the second heating medium 7 rises and reaches the set temperature after the solenoid valve 10 and the external burner 6 are stopped, the controller 12 receives a signal from the temperature sensor 11, closes the solenoid valve 10, and the burner 6 stop. When the temperature of the second heat medium 7 falls below the operating set temperature due to heat transfer to the hot water supply heat receiver 8, the solenoid valve 10 opens, the burner 6 operates, and the heating of the hot water supply heat receiver 8 continues, as described above. I will do it. Figure 2 is a graph showing an example of the operation of the vacuum hot water boiler at this time, where the horizontal axis is time, the axis is the temperature of the second heat medium, and
A is burner heating, B is heat medium heating, C is heating stop,
A ₁₁ is the heat medium heating stop setting temperature, A ₁₂ is the heat medium heating start maximum setting temperature, A ₂₁ is the burner heating stop setting temperature, A ₂₂ is the burner heating start maximum setting temperature, and t is time. The second heating medium temperature is maintained between _A21 and _A11 by discriminating the signal from the temperature detector using the controller, opening and closing the solenoid valve 10 according to the set temperature, and operating and stopping the external burner 6. Ru. h ₆ in Figure 2
The fact that the temperature of the second heating medium decreases even though the heating medium is heated during h ₈ from It's for a reason.

Next, when the main engine 13 is stopped and the circuit of the heating medium return line 4 of the exhaust gas heating medium heater 1 is closed, heating of the heating medium is not performed in the vacuum hot water boiler 9, and only burner heating is performed. That is, if the signal from the temperature detector 11 is below the burner operation start maximum set temperature, the external burner 6 is activated by a signal from the controller, the second heating medium 7 is heated, and the heat receiving for hot water supply is accordingly heated. The vessel 8 receives heat and becomes ready to supply hot water.
When the temperature of the second heating medium 7 reaches the burner stop setting temperature, the external burner 6 is stopped by a signal from the controller that receives the signal from the temperature sensor. Hot water supply continues by repeating the above operations. Figure 3 is a graph showing an example of the operation of the vacuum hot water boiler in this case, where _a11 is the burner heating stop setting temperature, _a12 is the burner heating start maximum setting temperature, and the others are the second burner heating start temperature.
Since it is the same as the figure, the explanation will be omitted.

In addition, in the embodiment, the temperature sensor 11 is
Although an example is shown where it is provided in the heating medium section, the invention is not limited thereto, and it can be provided in the heat receiver 8 for hot water supply, the heater 5, etc. In addition, in place of the electromagnetic valve 14, a relief valve that operates to open when the pressure in the heat medium return line 4 becomes equal to or lower than a set pressure may be used.

[Effects of the invention] As detailed above, this invention uses the excess heat medium of the exhaust gas heating medium heater that utilizes the exhaust gas and burner heating to heat the hot water while the main engine is running, and when the main engine is stopped, only the burner heats the hot water. By heating, hot water can be supplied regardless of whether the main engine is running or stopped, and the excess heat medium (i.e., exhaust gas heat) can be effectively used regardless of load fluctuations on the exhaust gas heat medium heater. In addition, by using a vacuum hot water boiler as the hot water heater, the second heating medium is evaporated at a low temperature, so contact heat exchange between the hot water heater and the second heating medium is performed with steam, resulting in heat exchange. The rate is excellent. Furthermore, since the vacuum hot water boiler operates at low temperature and low pressure, it can be made very inexpensive in terms of structure.

[Brief explanation of drawings]

FIG. 1 is a flow sheet showing an embodiment of this invention. FIG. 2 is a graph showing an example of the operation of a vacuum hot water boiler when using surplus heating medium. FIG. 3 is a graph showing an example of the operation of a vacuum hot water boiler when surplus heat medium cannot be used. DESCRIPTION OF SYMBOLS 1... Exhaust gas heat heater, 2... Load, 3... Heat medium supply line, 4... Heat medium return line, 5... Heater, 6... External burner, 7... Second heat medium, 8...
... Heat receiver for hot water supply, 9 ... Vacuum hot water boiler, 1
0... Solenoid valve, 11... Temperature detector, 12... Controller, 13... Main engine, 14... Solenoid valve or relief valve, 15... Bypass circuit.

Claims (1)

[Claims for Utility Model Registration] (1) An outlet of an exhaust gas heat medium heater 1 that uses exhaust gas as a heat source and an inlet of a load 2 are connected by a heat medium supply line 3, and a return port of the exhaust gas heat medium heater 1 and an outlet of the load 2 are connected. They are connected by a heating medium return line 4, and in the middle of this heating medium return line, there are a heater 5 whose heat source is the heating medium of the exhaust gas heating medium heater 1, an external burner 6, and a vacuum-sealed heater heated by these. A vacuum type hot water boiler 9 is installed which includes a second heat medium 7 and a hot water supply heat receiver 8 heated by this heat medium, and is closed when such a vacuum type hot water boiler is in operation. A bypass circuit 15 is provided in which a solenoid valve 14 that opens when stopped is provided, a solenoid valve 10 is provided in the heating medium return line 4 upstream of the vacuum hot water boiler 9, a temperature detector 11 is provided in the vacuum hot water boiler 9, and a controller 12 that discriminates the signal from the temperature sensor 11, opens and closes the solenoid valve 10 according to the signal, and issues a signal to start and stop the burner 6.
A surplus heat medium utilization device characterized by being provided with. (2) The surplus heat medium utilization device according to claim 1, wherein the electromagnetic valve 14 is a relief valve that opens and closes depending on pressure.