JP4578437B2 - Hot water heat supply system by steam pressurization method - Google Patents

Description

  The present invention generates steam that matches the hot water temperature in the expansion tank, pressurizes the water in the system so that it does not boil even when heated to 100 ° C. or higher, and warm water of 100 ° C. or higher. The present invention relates to a hot water heat supply system for supplying heat to the outside, its use, and a method for supplying water to the hot water heat supply system.

Conventionally, hot water heated by a hot water boiler is led to an expansion tank, and the pressure in the expansion tank is held by the saturated steam pressure, and the expansion and contraction of the system is directly absorbed so that the hot water heated to 100 ° C. or higher is not boiled. A hot water heat supply system, such as a district heating system using hot water, has been developed (see Non-Patent Document 1, for example).
District Heating and Cooling Technology Manual, Japan District Heating and Cooling Association, March 1983, pp. 32-36

  However, in the above-described system, the pressure may decrease for some reason, and the hot water may evaporate. Therefore, it is necessary to replenish water by press-fitting the system with power from a high-pressure pump or the like.

  An object of the present invention is to provide a water replenishment method, a hot water heat supply system, and a use thereof that can efficiently replenish water into the system without using power such as a high-pressure pump.

  In order to solve the above-mentioned problems, a hot water heat supply system according to the present invention is a hot water heat supply system that is a closed system as a whole, and includes a hot water boiler that produces water at a predetermined temperature of 100 ° C. or higher, Cooling by providing heat in the heat supply device that supplies the heat of the supplied water to the outside, the water circulation path that circulates between the hot water boiler and the heat supply device, and the heat supply device A bypass path for mixing a part of the water with the water supplied from the hot water boiler, and for maintaining the water supplied from the hot water boiler to the heat supply device at a saturated vapor pressure at the predetermined temperature. In addition, a pressure vessel for receiving the water supplied from the hot water boiler before mixing with a part of the cooled water by supplying heat in the heat supply device, and a high water-soluble gas The vaporized water produced by vaporizing rate, and a hydrate vaporizer of injecting pressurized with the gas produced, the vaporized water to the circulation path by vaporizing the hydrate.

  The hot water heat supply system according to the present invention includes a heat exchanger that uses a part of the vaporized water, and a return means that returns the vaporized water that has provided the cold in the heat exchanger to the hydrate vaporizer. May be further provided.

  In addition, when the hydrate of the gas hardly soluble in water is a hydrate of a combustible gas, the hot water boiler is produced by vaporizing the hydrate of the combustible gas with the hydrate vaporizer. The water circulating in the circulation path may be heated using the combustible gas as fuel, and the combustible gas produced by vaporizing the hydrate of the combustible gas with the hydrate vaporizer is used as fuel. The hot water boiler may heat water circulating in the circulation path using exhaust heat obtained by the gas generator burning the combustible gas.

  The building which concerns on this invention uses the above hot water heat exchange systems, It is characterized by the above-mentioned.

  The water replenishment method according to the present invention includes a hot water boiler that produces water at a predetermined temperature of 100 ° C. or higher, a heat supply device that supplies heat of the water supplied from the hot water boiler to the outside, and the hot water boiler, The water circulation path that circulates between the heat supply device and a bypass for mixing a part of the water cooled by providing heat in the heat supply device with the water supplied from the hot water boiler Mixed with a portion of the water cooled by providing heat in the heat supply device, and in order to maintain the water supplied from the hot water boiler to the heat supply device at the saturated vapor pressure at the predetermined temperature And a pressure vessel for receiving the water supplied from the hot water boiler before supplying the water to the circulation path of the hot water heat supply system, which is a closed system as a whole, the hot water heat supply The stem includes a hydrate vaporizer that vaporizes a hydrate of a gas hardly soluble in water, and the hydrate vaporizer is pressurized with the gas produced by vaporizing the hydrate. Vaporized water produced by vaporizing the rate is injected into the circulation path.

  As the hydrate of the above-mentioned water-insoluble gas, for example, hydrate of flammable gas such as nitrogen gas hydrate, methane hydrate, ethane hydrate, propane hydrate, natural gas hydrate, etc. Alternatively, a mixture thereof can be used.

  According to the present invention, it is possible to provide a water replenishing method, a hot water heat supply system, and a use thereof, which can efficiently replenish water into the system without using power such as a high-pressure pump.

  Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a diagram showing a schematic configuration of a hot water heat supply system 100 described as an embodiment of the present invention. As shown in FIG. 1, a hot water heat supply system 100 according to the present invention includes an NGH vaporizer 10, an expansion tank 20, a pump 30, a hot water boiler 40, a heat supply device 50, and the like. The hot water heat supply system 100 according to the present invention includes a pipe (circulation path) 4 through which water can sequentially circulate through the hot water boiler 40, the expansion tank 20, and the heat supply device 50, and water discharged from the heat supply device 50. A pipe (bypass passage) 5 for mixing a part of the water with the water discharged from the expansion tank 20 is provided, and the entire system has a sealed structure.

  The hot water boiler 40 is a device that pressurizes and heats water to produce water at a predetermined temperature (100 ° C. or higher). The heat supply device 50 is a device that supplies the heat of water supplied from the hot water boiler 40 to the outside. The heat supply device 50 is, for example, a hot water supply device, a heating device, a snow melting device, or the like.

  The expansion tank 20 receives water at a predetermined temperature supplied from the hot water boiler 40 to the heat supply device 50 and mixed with a part of the cooled water by providing heat in the heat supply device 50, and the temperature of the water It is a hermetic type pressure-resistant container kept at the saturated vapor pressure in As described above, the expansion tank 20 is provided with the expansion tank 20 that holds the inside of the tank 20 at the saturated vapor pressure at the temperature of the water supplied from the hot water boiler 40 in the closed hot water heat supply system 100. When water supplied from 40 is received, water of a constant pressure (saturated vapor pressure) is discharged and supplied to the heat supply device 50, so that the entire system can be maintained at a constant pressure (saturated vapor pressure). The water flowing in the circulation path 4 and the bypass path 5 can be prevented from vaporizing. In the present embodiment, the expansion tank 20 is provided with a pressure adjustment valve 21 for adjusting the pressure in the expansion tank 20 to a predetermined pressure.

  The pump 30 supplies water supplied from the hot water boiler 40 via the expansion tank 20, that is, water discharged from the expansion tank 20 and a part of water cooled by providing heat in the heat supply device 50. It is a device for transferring the mixed water to the heat supply device 50. Thus, after the water discharged from the expansion tank 20 is cooled by mixing with a part of the water cooled by providing heat in the heat supply device 50, the cooled mixed water is supplied with heat by the pump 30. By supplying to the apparatus 50, it becomes possible to prevent the water discharged from the expansion tank 20 from evaporating due to a decrease in pressure, and to prevent the pump 30 from being broken. Note that a part of the water discharged from the heat supply device 50 by driving the pump 30 is directly supplied to the heat supply device 50 via the pipe 5 by opening the mixing valve 64, and the remaining water is supplied via the pipe 4. It is supplied again to the heat supply device 50 through the hot water boiler 40 and the expansion tank 20.

  The NGH vaporizer 10 is a device that vaporizes natural gas hydrate (NGH). The vaporization of NGH may be performed by adding water to NGH or by adding heat to NGH. The NGH vaporizer 10 produces water (vaporized water) and natural gas by vaporizing NGH introduced into the apparatus 10. The vaporized water produced in the NGH vaporizer 10 is compressed by the produced natural gas and is pressed into the circulation path 4 through the pipe 2 by opening the water supply valve 62. On the other hand, the natural gas produced in the NGH vaporizer 10 is supplied to the hot water boiler 40 via the pipe 1 by opening the gas supply valve 61 and used as fuel for the hot water boiler 40.

  In the present embodiment, a part of the water accumulated in the NGH vaporizer 10 is drained by opening the drain valve 63, but the drainage is performed after the cool heat of the drained water is effectively used in the heat exchanger. Alternatively, a septic tank may be provided to purify the drained water so that it can be used as drinking water.

  As described above, the hot water heat supply system 100 according to the present invention includes the NGH vaporizer 10 so that water can be efficiently supplied into the circulation path 4 without using power such as a pressure pump. It becomes like this.

  Further, in the hot water heat supply system 100 of the present invention, the natural gas obtained by vaporizing NGH is used only for injecting the vaporized water obtained by vaporizing NGH into the circulation path 4. And can be used as a fuel for the hot water boiler 40. Therefore, it is not necessary to separately provide a pressurizing device such as a pressurizing pump or a compressor for pressurizing water into the circulation path 4 or a fuel tank of the hot water boiler 40, so that the scale of the entire system can be reduced. Can be economical.

  As shown in FIG. 1, the hot water heat supply system 100 described above includes a heat exchanger 12 and a pump that supplies part of the vaporized water that is press-fitted into the circulation path 4 from the NGH vaporizer 10 to the heat exchanger 12. 11 and a pipe 3 for returning a part of the vaporized water from the pipe 2 to the NGH vaporizer 10 via the pump 11 and the heat exchanger 12 may be further provided. Thereby, the cold heat of the vaporized water obtained by vaporizing NGH can be used effectively, and the vaporized water provided with the cold heat can be used for vaporizing NGH in the NGH vaporizer 10.

  In the present embodiment, the natural gas generated in the NGH vaporizer 10 is supplied as fuel to the hot water boiler 40 via the pipe 1 to heat the water circulating in the circulation path 4. The hot water boiler 40 supplies water as a fuel for a gas generator such as a turbine or a gas engine, and heats the water circulating in the circulation path 4 by using the exhaust heat obtained by the gas generator burning natural gas. Also good. As a result, electricity generated by the gas generator can be used, and energy can be used effectively.

  Furthermore, in the present embodiment, the NGH vaporizer 10 that vaporizes NGH is provided in the hot water heat supply system 100 according to the present invention, but combustible materials such as methane hydrate, ethane hydrate, and propane hydrate other than NGH are provided. A hydrate vaporizer that vaporizes the hydrate of the natural gas may be provided, and when the gas generated by vaporizing the hydrate is not used as fuel for a boiler or the like, it is difficult to use water such as nitrogen gas hydrate. A hydrate vaporizer for vaporizing soluble, preferably insoluble gas hydrates may be provided.

  The hot water heat supply system 100 as described above is useful as a hot water supply system, a heating system, an air conditioning system, and the like in a building such as an apartment, and is also useful as a snow melting system such as a road or a railway.

It is a figure showing the whole hot water heat supply system composition explained as one embodiment of the present invention.

Explanation of symbols

1-5 Piping 10 NGH vaporizer 11 Pump 12 Heat exchanger 20 Expansion tank 21 Pressure control valve 30 Pump 40 Hot water boiler 50 Heat supply device 61 Gas supply valve 62 Water supply valve 63 Drain valve 64 Mixing valve 100 Hot water heat supply device

Claims (6)

In the hot water heat supply system, which is a closed system as a whole,
A hot water boiler that produces water at a predetermined temperature of 100 ° C. or higher;
A heat supply device for supplying heat of the water supplied from the hot water boiler to the outside;
The water circulation path circulating between the hot water boiler and the heat supply device;
A bypass for mixing part of the water cooled by providing heat in the heat supply device with the water supplied from the hot water boiler;
In order to maintain the water supplied from the hot water boiler to the heat supply device at the saturated vapor pressure at the predetermined temperature, before mixing with a part of the water cooled by providing heat in the heat supply device A pressure vessel for receiving the water supplied from the hot water boiler;
A hydrate that pressurizes vaporized water produced by vaporizing a hydrate of a gas that is sparingly soluble in water with the gas produced by vaporizing the hydrate, and pressurizes the vaporized water into the circulation path. A vaporizer;
A hot water heat supply system comprising: The hydrate of a gas hardly soluble in water is a hydrate of a combustible gas,
2. The hot water heat supply system according to claim 1, wherein the hot water boiler uses the combustible gas produced by vaporizing the hydrate of the combustible gas with the hydrate vaporizer. The hydrate of a gas hardly soluble in water is a hydrate of a combustible gas,
A gas generator that uses the combustible gas produced by vaporizing the hydrate of the combustible gas in the hydrate vaporizer;
2. The hot water according to claim 1, wherein the hot water boiler heats water circulating in the circulation path using exhaust heat obtained when the gas generator burns the combustible gas. Heat supply system. A heat exchanger that utilizes the cold of a portion of the vaporized water;
A return means for returning the vaporized water that has provided cold energy in the heat exchanger to the hydrate vaporizer;
The hot water heat supply system according to claim 1, further comprising:   The building using the warm water heat supply system in any one of Claims 1-4. A hot water boiler that produces water at a predetermined temperature of 100 ° C. or higher;
A heat supply device for supplying heat of the water supplied from the hot water boiler to the outside;
The water circulation path circulating between the hot water boiler and the heat supply device;
A bypass for mixing part of the water cooled by providing heat in the heat supply device with the water supplied from the hot water boiler;
In order to maintain the water supplied from the hot water boiler to the heat supply device at the saturated vapor pressure at the predetermined temperature, before mixing with a part of the water cooled by providing heat in the heat supply device A pressure vessel for receiving the water supplied from the hot water boiler;
A method of replenishing water to the circulation path of the hot water heat supply system, which is a closed system as a whole,
The hot water heat supply system includes a hydrate vaporizer that vaporizes a hydrate of a gas that is hardly soluble in water,
The hydrate vaporizer presses vaporized water produced by vaporizing the hydrate pressurized with the gas produced by vaporizing the hydrate into the circulation path. How to replenish water.

Images