JPS6096802A - Steam generator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steam generator, and more particularly to a steam generator that utilizes metal hydrides and has excellent heat exchange performance.

It is known that certain metals and alloys exothermically absorb hydrogen to form metal hydrides, and that these metal hydrides reversibly and endothermically release hydrogen. Various devices have been proposed, such as heat pump devices that utilize the characteristics of metal hydrides. However, in general, a heat pump device is configured with metal hydride (i) filled in a closed container that also serves as an exchanger, and the object to be heated is heated by heat exchange with this heat exchanger. In order to heat steam to obtain high-temperature steam, the heat transfer coefficient of steam is extremely low, so it is necessary to provide a heat exchanger with many fins.As a result, the heat capacity of the heat exchanger increases, and heat pump equipment The coefficient of performance decreases, making it impossible to efficiently obtain high-temperature steam.

The present invention was made to solve the above-mentioned problems in steam generators using metal hydride heat pumps, and an object of the present invention is to provide a steam generator with excellent heat exchange performance.

The steam generator of the present invention is filled with a first metal hydride that has a low hydrogen decomposition pressure in the FAT operating temperature range, and also contains high-temperature pressurized water as a high-temperature heat medium from a high-temperature pressurized water container and medium-temperature heat medium. A first container capable of exchanging heat in a manner that allows for heat exchange; heat exchange between the second container and the medium-temperature heating medium to release hydrogen from the second metal hydride; a first container, exothermically occluded by the first metal hydride in the first container and heated by heat exchange with high temperature pressurized water, and then heat exchanged with a medium temperature heating medium in the first container. A cycle is performed in which hydrogen is released from a first metal hydride, the hydrogen is introduced into a second container, and is occluded in the second metal hydride, and high-temperature steam is obtained from heated high-temperature pressurized water. do.

The steam generator of the present invention will be explained below based on the drawings.

FIG. 1 shows a device configuration diagram as an embodiment of the steam generating device of the present invention.

The first container l is filled with a first metal hydride (Ml(l)) which has a low hydrogen equilibrium decomposition pressure in the operating temperature range, and the second container 2 is filled with a second metal hydride (Ml(l)) which has a high hydrogen equilibrium decomposition pressure. These containers are filled with compound (Ml2), and these containers have an on-off valve 3.
They are communicated with each other by a hydrogen communication pipe 4 equipped with.

In addition, a heat exchanger 5 is disposed in the first container so as to be able to exchange heat therewith, and this heat exchanger is connected to a high-temperature heat medium from 1 ril hot pressurized water h 4:17 so that it can be switched by a switch valve 6. It is connected to a mixed thread of a medium-temperature heating medium 8 having a temperature of '1゛M, and is circulated by pumps 9 and 10, respectively, to exchange heat with the MHI.

Similarly, the second container is equipped with a heat exchanger to enable heat exchange with it.
1 is arranged, and this E-niji exchanger has a switching valve 12 with a J
To enable moxibustion, a medium-temperature heating medium 8 and a temperature of 1゛1゜A1) Shoulder: Connected to the pipe system of the heating medium 3, each pump 14
and 15, and heat exchanged with Ml2 for one song.

A steam extraction pipe 17 equipped with an expansion valve 16 is connected to the Sansui container, and as described later, the high-temperature pressurized water stored in the high-temperature pressurized ice container is expanded under reduced pressure by the expansion valve. By doing so, high temperature steam can be obtained from the steam extraction pipe. In addition, the high temperature pressurized water container has an on-off valve 1.
8 is connected to the water supply pipe 19, and water is supplied as needed. In this case, pressurize the air to a low pressure and liquefy it.
You can supply water to +rb warm pressurized water container b).

However, the illustrated heating medium piping system and switching valve are merely examples, and any other means may be used as long as the heating medium at a predetermined temperature of each heat exchanger can be switched.

The operation of the above-mentioned device will be explained below based on FIG. 2 which shows a Seikl diagram. The horizontal axis is the reciprocal of the absolute temperature '1', and the vertical axis is the logarithm of the hydrogen equilibrium decomposition pressure P of the metal hydride.

First, a heat medium is passed through the heat exchanger of the second container, and M
l2 inside/! The ATM is heated to release hydrogen, and this hydrogen is introduced into the first container through the hydrogen communication pipe, where MHI and Ml
Hydrogen is exothermically occluded by the MHI due to the pressure difference between the two hydrogen equilibrium decomposition pressures, and the high temperature pressurized water flowing through the heat exchanger is heated by the exothermic reaction. Next, by operating the switching valves in each pipe system, the first container is maintained at the medium temperature TM with the medium temperature heating medium, and the second container is cooled with the low temperature heating medium, and the MHI
A metal hydride pressure difference is created between MHI and Ml2 to release hydrogen from MHI and store it in Ml-12.

After this, the medium temperature heat medium is passed through the heat exchanger of the second container.
M 1+ 2 is set to medium temperature 'rM, and high y2A P,! is applied to the heat exchanger of the first container. ';iT'b ti as a medium!
? If pressurized water is passed through it, it will return to its original state and complete the cycle. Gonoyo) nishi-(lt11〆l
! High 6 heated to lit! ! As mentioned above, if pressurized water is expanded under reduced pressure through an expansion valve, high-temperature steam can be obtained.

In the following, we have explained the case where a single actuation pair consisting of the first and second vessels is used, but it is also possible to provide a plurality of actuation sequences and each react to the exothermic reaction of the first vessel that enters j. The hot pressurized water may be heated alternately or sequentially.

According to the shiso device of the present invention, as shown in below-1-, high-temperature pressurized water is passed through the first container (heat exchange) Therefore, unlike when heating steam directly, the temperature of the first container!
: By reducing the heat capacity of the N1 exchanger, it is possible to heat high-temperature pressurized water with the same heat exchange performance, and with this high n1, steam at a higher temperature than heated water can be obtained more easily. By storing heated, high-temperature, pressurized water in a container, its temperature changes are moderated, and it is possible to produce 1q of high-temperature steam in a stable manner.

To explain an example of the operation of the device of the present invention based on an experiment, M HI is set to 10 +r, Mit
2 and M ) (2 as L a N i 4.7
In a so-called 4-phone type device that uses s^'0.2F10kg to constitute a working pair, and has two such working pairs,
When the high temperature pressurized water temperature is 150°C (pressure 5kg/c+d), the medium temperature heating medium temperature is +00°C, and the low temperature heating medium temperature is 30°C, the output is 2400Kcal with a coefficient of performance of the device of 0.40.
/ I was able to find time.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an apparatus showing an embodiment of the present invention, and FIG. 2 is a Seikle diagram for explaining the operation of the apparatus. DESCRIPTION OF SYMBOLS 1... First container, 2... Second container, 4... Hydrogen communication pipe, 5... Heat exchanger, 7... High temperature pressurized water container, 8... Medium temperature heat medium, 11... Heat exchanger, 13...
Low temperature heating medium, I6... expansion valve, 17... steam extraction pipe.

Claims (1)

[Claims] ill (11) filled with a first metal hydride having a low hydrogen equilibrium decomposition pressure in the a1 operating temperature range, and with high temperature pressurized water as a high temperature heat medium from a high temperature pressurized water container.
a first container capable of switchably exchanging heat with a hot heating medium; (b) a second metal hydride communicated with the first container and filled with a high hydrogen equilibrium decomposition pressure; fd) The second container is heat exchanged with a medium-temperature heating medium to release hydrogen from the second metal hydride, and this hydrogen is introduced into the first container. 1st container of
The metal hydride is exothermically occluded and heated by heat exchange with high temperature pressurized water, and then the first container is heat exchanged with a medium temperature heating medium to release hydrogen from the first metal hydride. A steam generator characterized in that high-temperature steam is obtained from heated high-temperature pressurized water by conducting a cycle in which hydrogen is introduced into a second container and stored in a second metal hydride.