JPS6314674B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical Field of the Invention] This invention relates to a steam compression water generation device, that is, a steam compression water generation device that mechanically compresses and heats the steam generated in the device body using a compressor to obtain a water generation effect. It is related to the device. [Prior Art] Fig. 1 shows an outline of this type of conventional steam compression type fresh water generating apparatus using a block configuration. That is, in FIG. 1, reference numeral 1 denotes the main body of the fresh water generator, which includes a steam generation chamber 2 in which a demister 3 and a heat exchanger tube 4 are arranged, and a chamber 5 that is partitioned by a partition wall and has the heat exchanger tube 4 open. After the generated steam is once taken out of the main body, it is compressed by a compressor 6 driven by a driver 7 and sent into the heat exchanger tubes 4. Further, 8 is a condenser with an air extraction device 9, 10 and 11 are heat exchangers, and 12 is a heater that utilizes high-temperature waste heat from, for example, a diesel engine. As for the pipes connecting these devices, a is a raw water (seawater) pipe, b is a distilled water pipe, c is a non-condensable gas pipe, d is a brine pipe, and e is a steam pipe. It is a conduit. In this configuration, raw water is first sent to the condenser 8 at a predetermined pressure by a raw water pump (not shown), where non-condensable gas is extracted and accompanying steam is condensed, and then the heat exchanger 10 converts it into distilled water. The heat exchanger 11 performs heat exchange between the water and the brine (brine for blowdown), cools the distilled water and the brine, and preheats itself at the same time. 12 and then introduced into the apparatus main body 1, the temperature is further increased by the heat transfer tube 4 in the apparatus main body 1, and then vacuum evaporated at the inner bottom of the apparatus main body 1. The steam thus obtained is sucked, compressed, and raised in temperature by the compressor 6, and then reaches the condenser 8 via the heat transfer tube 4 and the chamber 5. It is cooled and liquefied to become distilled water, which is taken out to the outside through the aforementioned heat exchanger 10 together with the liquefied distilled water in the chamber 5, thereby achieving the desired water production effect. As can be seen from the above description of the operation, the conventional vapor compression water generator configured as described above utilizes a type of heat pump operation. It is generally known that the larger the difference between condensing pressure (temperature) and evaporation pressure (temperature), ΔP (ΔT), the worse the coefficient of performance (thermal efficiency) of this heat pump is. In the case of conventional devices that utilize heat pump action, the exhaust steam that has passed through the compressor is cooled using raw water heated by high-temperature waste heat from diesel engines or other heat sources, which naturally causes problems. However, as the condensing pressure increases, the coefficient of performance as a heat pump is not good, and the thermal efficiency of the water generator, which is usually called the water production ratio, the water production unit, the water production amount/input energy, is poor, and it is not economical. Moreover, it also caused problems in terms of energy consumption. [Summary of the Invention] In view of these drawbacks of the conventional device, the present invention
The pressurized raw water is preheated and evaporated in a reduced pressure flash inside the equipment body, and the steam after this flashing and the steam from the heating and evaporation of the brine are together drawn into a compressor and compressed. The brine is heated and evaporated using steam. [Embodiment] Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. 2. In the embodiment shown in FIG. 2, the same reference numerals as in the conventional example shown in FIG. 1 indicate the same or corresponding parts.
A heat exchanger tube 13 is introduced into the chamber 5 for preheating, and the demister 3 is disposed in the upper part and the heat exchanger tube 4 is disposed in the bottom brain in the steam generation chamber 2 of the apparatus main body 1. An evaporation tray 14 for evaporating the introduced raw water is arranged below the demister 3 and above the bottom brine evaporation surface. Therefore, in the case of this embodiment, the raw water that has passed through the condenser 8 is preheated by the heat exchanger tube 13, then heat exchanged through the heat exchangers 10 and 11, and heated by the heater 12 to produce steam in the device body 1. It is guided to an evaporation tray 14 arranged inside the generation chamber 2. Then, this raw water, that is, the raw water whose temperature has been sufficiently raised under a predetermined pressure by the raw water pump, is reduced to the internal pressure (vacuum) of this steam generation chamber 2 by suction by the compressor 6, and flash evaporates on the evaporation tray 14. This is drawn into the compressor 6 and compressed together with the steam generated by heating and evaporating the brine stored at the bottom, and the temperature rises and reaches the heat transfer tube 4, where, on the one hand, as described above, The brine is heated and evaporated at the steam temperature, and through this heat exchange, the steam itself is cooled and liquefied, and is extracted outside as distilled water. Here, the reason why the heat exchanger tube 13 is provided in the chamber 5 is to preheat the raw water, and also to preheat the compressor 6.
Depending on the compression ratio of the steam discharged from the compressor 6, there is a difference between the latent heat of vapor and the latent heat of condensation of the steam discharged from the compressor 6. In other words, the latent heat of condensation may be larger, and the steam that passes through the brine of the steam generation chamber 2 may differ. In some cases, the entire amount in the heat transfer tube 4 is not liquefied and the mixture in the chamber 5 is in a gas-liquid state, and this is completely liquefied by heat exchange with the raw water flowing into the heat transfer tube 13. It's for a reason. Incidentally, when water production is performed under the same conditions for the conventional example device and this example device, the temperature at the inlet of raw water into the steam generation chamber, the evaporation temperature of steam at the inlet of the compressor (the suction temperature of the compressor) pressure),
and the condensation temperature of the vapor at the outlet of the compressor are shown below.

〔Effect of the invention〕

As described in detail above, according to the present invention, in a steam compression type water generation apparatus that mechanically compresses and heats the steam generated in the apparatus main body using a compressor to obtain a water generation effect, pressurization is performed. The raw water is preheated and heated, and is guided into the device main body which is in a reduced pressure state by the suction of the compressor, and is evaporated in a reduced pressure flash using an evaporation tray placed inside the device main body. The steam and the steam generated by heating and evaporating the brine are both sucked into a compressor and compressed, and the discharged pressurized steam is passed through a heat transfer tube placed inside the brine to heat and evaporate the brine, Since distilled water is obtained by cooling and liquefying the steam itself, it is possible to reduce the driving force of the compressor or to lower the condensation pressure of the steam discharged from the compressor, which reduces the amount of energy input relative to the amount of water produced. It has the advantage that the amount can be reduced, and the device configuration can be relatively small and simplified compared to conventional devices.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an outline of a conventional steam compression type fresh water generator, and Figure 2 is a block diagram showing an outline of a vapor compression type fresh water generator to which an embodiment of the present invention is applied. be. 1... Water generator main body, 2... Steam generation chamber, 4...
...Heat transfer tube for passing discharged steam, 5...Chamber, 6
... Compressor, 8 ... Condenser, 10 and 1
1... Heat exchanger between raw water, distilled water, and brine, 12... Heater, 13... Heat exchanger tube through which raw water passes, 14... Tray for evaporation.

Claims (1)

[Scope of Claims] 1. A device main body that forms a steam generation chamber, has a heat transfer tube for discharged steam at the bottom of the steam generation chamber, and an evaporation tray at the top, and sucks the steam generated in the steam generation chamber. , comprising at least a compressor for compressing and discharging it into the heat transfer tube, and means for preheating and heating pressurized raw water and guiding it onto the evaporation tray, and for preheating and heating the pressurized raw water. After that, the vapor is guided onto the evaporation tray inside the device main body which is in a reduced pressure state by suction by a compressor, and is evaporated in a reduced pressure flash. 1. A steam compression type fresh water generator, characterized in that the brine is compressed and the discharged steam is passed through a heat transfer tube to heat and evaporate the brine, and to cool and liquefy the steam itself. 2. The vapor compression type fresh water generator according to claim 1, wherein the evaporation tray in the steam generation chamber is arranged above the brine liquid level. 3. The vapor compression type water generating apparatus according to claim 1, further comprising a chamber for receiving the discharged steam that has passed through the heat transfer tube, and a means for preheating raw water disposed within the chamber.