JPH0410529Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an absorption type water chiller/heater, and is used to reduce the power consumption of the electric heater required for preheating heavy oil, which is the fuel, and to extend the life of the electric heater. The present invention relates to a fuel preheating device for a suitable absorption type water chiller/heater.

[Conventional technology]

FIG. 2 shows an example of a fuel preheating device 21 of a conventional absorption type water chiller/heater. Heavy oil, which is the fuel supplied to an oil tank 22, is supplied into a combustion device 23 from the lower part of the oil tank 22. Inside this combustion device 23, there is an oil pump 25 for feeding heavy hydraulic pressure,
Preheater 26 that heats heavy oil and turns combustion on and off
An ON-OFF solenoid valve 28 and a spray nozzle 29 that spray heavy oil are arranged in series. Combustion air regulated by a damper 32 is supplied to the burner 30 from a blower 31 . Inside the preheater 26,
An electric heater 33 for heating heavy oil is provided, and a temperature sensor 35 detects the temperature of the heavy oil in the preheater 26.
The ON-OFF switch 36 controls power supply to the electric heater 33. Further, the ON-OFF solenoid valve 28 and the blower 31 are controlled by a controller 38 electrically connected to the ON-OFF switch 36.

By the way, in the absorption type water cooler/heater, when the outside temperature drops to 0° C. or lower in winter, the viscosity of the heavy oil increases, making it difficult to atomize the heavy oil with the spray nozzle 29.
Therefore, the combustion condition deteriorates, resulting in incomplete combustion, resulting in drawbacks such as reduced efficiency and non-ignition. Therefore, in the above conventional technology, in order to heat heavy oil to an appropriate temperature and lower its viscosity in winter, an electric heater 3 is used.
3 is provided to preheat and raise the temperature of heavy oil supplied to the burner 30. As mentioned above, this electric heater 33 is controlled by the ON-OFF switch 36, and when the temperature sensor 35 detects that the heavy oil temperature has risen to 20 to 40°C, the ON-OFF switch 36 is opened. The power supply to the electric heater 33 is stopped.

[Problem that the invention attempts to solve]

However, according to the above-mentioned conventional technology, during winter operation, the electric heater 33
There was a problem that it was uneconomical because it required electricity to be applied to the terminal. In addition, electric heater 3 is installed to adjust the temperature of heavy oil.
Since the electric heater 33 is constantly controlled to be turned on and off, there is a problem in that the life of the electric heater 33 is shortened.

The purpose of the present invention is to solve the above-mentioned problems and provide a fuel preheating device for an absorption type water chiller/heater in which heavy oil, which is a fuel, can be preheated using the heat of hot water generated in a heating cycle. That's true.

[Means for solving problems]

To achieve this objective, the present invention includes a regenerator that heats an absorption solution using heavy oil as fuel, an evaporator that heats load circulating water with the latent heat of condensation of refrigerant vapor from the regenerator, and a A heating cycle is formed by a cooling/heating switching valve that guides refrigerant vapor and absorption solution from the regenerator, and a solution pump that pumps the absorption solution and condensed refrigerant to the regenerator, and the load circulating water heated in the heating cycle is The system is equipped with a hot water heater that uses the heat from the hot water as a heating source for heavy oil.

[Effect]

According to the above configuration, the absorption solution in the regenerator is
It is heated using heavy oil as fuel and generates refrigerant vapor.
This refrigerant vapor, accompanied by the absorption solution, passes through the cooling/heating switching valve and is led to the evaporator. Then, the load water flowing in the evaporator is heated by the latent heat of condensation of the refrigerant vapor, and is led to the indoor load. The condensed refrigerant flows together with the absorption solution into the regenerator again by the solution pump to form a heating cycle. The hot water generated by this heating cycle circulates within the hot water heater, thereby heating the heavy oil passing through the hot water heater.

〔Example〕

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

FIG. 1 shows a fuel preheating device 1 for an absorption type water chiller/heater according to the present invention, and the same parts as those shown in FIG. 2 will be described with the same reference numerals.

The fuel preheating device 1 of the absorption type water chiller/heater includes a regenerator 2 that is heated using heavy oil as fuel;
and a separator 5 that is connected in communication with the liquid lift pipe 3 and separates the refrigerant vapor generated in the regenerator 2 from the absorption solution;
A cooling/heating switching valve 8 is provided to guide this refrigerant vapor and absorption solution to the evaporator 6. Also, combustion device 2
3, an oil pump 25, a hot water heater 9, a preheater 26, an ON-OFF solenoid valve 28, and a spray nozzle 29 are arranged in series. Inside the coil 6a of the evaporator 6, load water for transferring heat to a load, for example, an indoor load, is circulated, and a part of it is introduced into a hot water heater 9 connected by a hot water introduction pipe 10.
The water is circulated within the hot water heater 9.

Further, in FIG. 1, 11 is a condenser connected to the separator 5, 12 is an absorber connected to the condenser 11 and placed opposite the evaporator 6, and 13 is connected to the controller 38. , a hot water thermostat that controls the combustion of the absorption type water chiller/heater based on the temperature of the load water in the coil 6a of the evaporator 6; 15 is a solution pump disposed in the pipe 16 connecting the regenerator 2 and the evaporator 6; be.

Next, the operation of the embodiment of the present invention will be explained.

When heating is performed in winter when the outside temperature is below 0° C., when the temperature sensor 35 detects a low temperature of heavy oil, the ON-OFF switch 36 is closed and the electric heater 33 is energized. When the heavy oil temperature rises to a set temperature (generally 20 to 40°C), combustion operation is started by a signal from the controller 38, pre-purging is performed by the blower 31, and the oil pump 25 is started. ON−
Combustion begins by opening the OFF solenoid valve 28.

Then, the absorbed dilute solution in the regenerator 2 is heated by the heavy oil spray sprayed from the spray nozzle 29,
Refrigerant vapor is generated, and the heated absorption solution and refrigerant vapor eventually ascend the liquid lift pipe 3 and reach the separator 5, but since cooling water is not circulated to the absorber 12 and condenser 11, The separated refrigerant vapor passes through the cooling/heating switching valve 8 and is guided to the evaporator 6 together with the absorption solution.

The load water flowing through the coil 6a of the evaporator 6 is heated by the latent heat of condensation of the refrigerant vapor, and is led to the indoor load in the direction of arrow A. Here, the condensed refrigerant flows together with the absorption solution into the regenerator 2 again by the solution pump 15 to continue the heating cycle. Therefore, over time, the load water flowing through the coil 6a of the evaporator 6 becomes hot water at a typical heating temperature of 50 to 55°C. As the temperature of this hot water rises, the temperature of the hot water in the hot water heater 9 that circulates hot water through the hot water introduction pipe 10 also rises, and begins to heat the heavy oil that is the fuel that passes through the hot water heater 9. . The heating degree in this hot water heater 9 is
The heat transfer area and the amount of hot water circulation are adjusted so that the temperature of the heavy oil is approximately 30°C at which the hot water thermometer 13 stops the fuel of the absorption chiller/heater (approximately 55°C). Therefore, since the heavy oil that has passed through the hot water heater 9 has been sufficiently heated, reheating in the preheater 26 is unnecessary, and the electric heater 33 is in a non-energized state. Suddenly, the absorption type water cooler/heater is turned on.
Even if it is turned off, the load water flowing through the evaporator 6 continues to be circulated to the hot water heater 9, so the heavy oil continues to be heated, and when the next combustion restarts,
Preheating by the electric heater 33 becomes unnecessary. In addition, even when the absorption type water cooler/heater is in a state where combustion is stopped, the hot water is adjusted to 50° to 55°C by the hot water thermometer 13, so the temperature does not rise above 60°C, which is the flash point of heavy oil. do not have. That is, as long as the absorption refrigerating machine continues heating operation, it is not necessary to energize the electric heater 33. In addition, when operating at a temperature below the assumed outside temperature, both the hot water heater 9 and the preheater 26 will operate, and when the heavy oil reaches the set temperature, it will be transferred to the electric heater 33 of the preheater 26. energization is stopped. That is, it becomes a two-stage heating system, and an appropriate heavy oil temperature can be obtained.

[Effect of idea]

As mentioned above, according to the present invention, a small portion of the heating output is used as a heating source, but the heavy oil used as fuel is significantly cheaper than the electricity bill, and the heating of the heavy oil by the electric heater is required at the start of operation. Since the power consumption can be reduced significantly, power consumption can be significantly reduced. Furthermore, since the energization time and the number of ON/OFF times of the electric heater are reduced, the life of the electric heater is extended. Furthermore, even if the absorption type water chiller/heater is operated at a temperature below the assumed outside temperature, 2.
Since it is a staged heating system, appropriate heavy oil temperature can be obtained. Additionally, the device of the present invention greatly facilitates maintenance of the preheater system, which is prone to corrosion due to heavy oil.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a fuel preheating device for an absorption type water chiller/heater according to the present invention, and FIG. 2 is a system diagram of a fuel preheating device for an absorption type chiller/heater according to a conventional example. 1...Fuel preheating device for absorption type water chiller/heater, 2...
Regenerator, 6... Evaporator, 8... Cooling/heating switching valve, 9...
...Hot water heater, 15...Solution pump.

Claims (1)

[Scope of utility model registration request] a regenerator that heats an absorption solution using heavy oil as fuel; an evaporator that heats load circulation water with latent heat of condensation of refrigerant vapor from the regenerator; and a refrigerant vapor and absorption solution from the regenerator that are introduced to the evaporator. A heating cycle is formed by a cooling/heating switching valve and a solution pump that pumps the absorption solution and condensed refrigerant to the regenerator, and a part of the load circulating water heated in the heating cycle is introduced, and the hot water is A fuel residual heat device for an absorption type water chiller/heater equipped with a hot water heater that uses heat as the heating source for heavy oil.