JPS622667B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a boiler used for heating a fluid to be heated such as water for hot water supply or water for heating, etc.
Specifically, a heat medium liquid reservoir section for storing a heat medium liquid, a steam chamber for storing water vapor generated from the heat medium liquid reservoir section,
The interior of a closed container equipped with a heat exchange unit for exchanging heat between the steam in the steam chamber and the fluid to be heated is maintained below atmospheric pressure, and the steam generated by heating the heat transfer liquid is condensed in the steam chamber. . A reduced pressure boiler configured to return generated condensed water to the heat medium liquid reservoir.

Conventional reduced pressure boilers of this type were configured to heat and raise the temperature of the fluid to be heated using only the generated steam, but for safety reasons, it was not possible to generate reduced pressure steam of 90°C or higher. Because I can't
For example, it cannot be used for generating heat sources that require high temperatures of 90°C to 120°C, such as heat sources for absorption chillers or heat sources for boiler feed water heating. It was hot. Moreover, when heating multiple fluids that require different temperatures, such as water for hot water supply and water for space heating, a boiler whose internal pressure is set to generate steam at a temperature commensurate with the required temperature is required. Either one must be prepared for each number of fluids to be heated, or the temperature of the fluid to be heated on the low-temperature side must be controlled by setting the internal pressure to generate steam at a temperature that matches the required temperature on the high-temperature side. , in the case of the former, boilers are required for the number of heated fluids with different required temperatures,
The latter method requires a temperature control mechanism, and either method has the disadvantage of inevitably increasing costs.

The present invention has an object to overcome such conventional drawbacks.

In the reduced pressure boiler according to the present invention, the heat medium liquid storage section includes a water storage chamber for storing water as a heat medium liquid, and a high boiling point heat medium liquid for storing a high boiling point heat medium liquid consisting of an aqueous solution in which a boiling point raising substance is dissolved. The water vapor chamber is divided into a plurality of storage chambers, and the condensed water generated in the steam chamber is returned to the water storage chamber, and excess water exceeding a certain amount is removed from the water storage chamber into the high boiling point heat transfer liquid storage chamber. It is characterized in that it is provided with a heat exchange section that heats another fluid to be heated by the high-boiling point heat medium liquid in the high-boiling point heat medium liquid storage chamber.

According to such a characteristic configuration of the present invention, although the device is operated by generating steam at a temperature of 90°C or less for safety, it is not necessary to use a high boiling point heat transfer liquid that is heated to a higher temperature than the steam temperature. Since a heat exchange section is provided that heats and raises the temperature of the fluid to be heated by heat exchange of The fluid to be heated can be heated to a plurality of different temperatures.

Moreover, the condensed water generated in the steam chamber is returned to the water storage chamber, and the surplus water generated by the return of the condensed water to the water storage chamber is supplied to the high boiling point heat transfer liquid storage chamber. Therefore, the temperature of the high boiling point heat transfer liquid can be stably maintained at a substantially constant value.

In other words, the condensed water generated by condensing water vapor is returned to the water storage chamber, but in order to keep the amount of water in the water storage chamber constant, surplus water exceeding a certain amount is transferred from the water storage chamber to the high boiling point heating medium. The liquid is supplied into the liquid storage chamber.
Since the total amount of water sealed in the airtight container is constant, the amount of water dissolving the boiling point raising substance is also the amount of water converted to steam from the total amount of water and the constant amount of water in the water storage chamber. The concentration of the substance that increases the boiling point in the high boiling point heat transfer liquid becomes almost constant, and the temperature of the high boiling point heat transfer liquid is stably maintained at an almost constant level. can be done.

Therefore, by appropriately selecting the temperature of the boiling point elevating substance in the high boiling point heat transfer liquid, the heating temperature of the fluid to be heated by the high boiling point heat transfer liquid can be arbitrarily set.

Therefore, according to the present invention, it is possible to expand the scope of use, and it is also possible to heat each of a plurality of fluids to be heated to their required temperatures without requiring a special temperature control mechanism. Ivy.

Hereinafter, an embodiment of the present invention will be described based on FIG.

In a heat medium liquid reservoir 2 of a closed container 1 whose interior is kept below atmospheric pressure and in which a heat medium liquid is sealed, there is a combustion tube 3 that heats and evaporates the heat medium liquid with combustion gas, and a heat medium that is heated and evaporated with combustion exhaust gas. Smoke pipe 4 that heats and evaporates the liquid...
A heat exchange section 5 which condenses and liquefies the steam and heats the low-temperature heated fluid a by indirectly exchanging heat between the generated steam and a low-temperature heated fluid such as water for hot water supply. The heat exchange section 5 is constructed by inserting a heat exchanger 7 into a steam chamber 6 of a closed container 1 into which a heated fluid a is supplied.

The heating medium liquid storage section 2 supplies an aqueous solution (an example of a high boiling point heating medium liquid) whose boiling point is higher than that of water by dissolving lithium bromide or calcium chloride as a boiling point elevating substance to a part of the smoke pipes 4... It is divided into a chamber 8A that accommodates water in a state where it is heated through the group, and a chamber 8B that accommodates water in a state where it is heated through the combustion tube 3 and the remaining smoke pipes 4... group. Both chambers 8A,
8B both have a steam chamber 6 so as to guide the steam generated therein to the heat exchange section 5, that is, the steam chamber 6.
The water storage chamber 8B is connected to the water storage chamber 8B, and is arranged to receive dripping condensed water from the steam chamber 6 only in the water storage chamber 8B.

The lithium bromide aqueous solution is stored in such a state that its liquid level L ₁ is located lower than the liquid level L ₂ of the water storage chamber 8B at a set concentration, and a partition plate 9 partitions the two chambers 8A and 8B. is configured to overflow from the water storage chamber 8B in an amount corresponding to the amount of water evaporated from the lithium bromide aqueous solution storage chamber 8A in the normal operating state. Therefore, under normal operating conditions, the concentration of the lithium bromide aqueous solution is maintained within the set range.

In addition, in the lithium bromide aqueous solution storage chamber 8A, the lithium bromide aqueous solution and the heated fluid b different from the above are subjected to indirect heat exchange to bring the different heated fluid b to a higher temperature than the heated fluid a. A heat exchanger 10A forming a heat exchange section 10 for heating and raising the temperature is inserted.

Reference numeral 11 denotes a heat exchanger that preheats the separate heating fluid b by heat exchange with generated steam.

The present invention may be implemented as follows.

As shown in FIG. 2, the high boiling point heat transfer liquid storage chamber 8
A is provided with a partition plate 12 that forms an ascending passage A and a descending passage B for convection circulation of heat medium liquid. In this case, heat exchange in the heat exchange section 10 can be performed efficiently.

As shown in FIG. 2, a plurality of heat exchangers 7, 7' are inserted in the steam chamber 6 to heat and raise the temperature of two or more heated fluids a, a' with generated steam. do.

As shown in FIG. 2, the heat transfer liquid is heated only by the smoke pipes 4.

The high boiling point heat transfer fluid storage chamber 3A is divided into chambers that separately accommodate two or more types of high boiling point heat transfer fluids.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing an embodiment, and FIG.
The figure is a schematic sectional view showing another embodiment. 1... Airtight container, 2... Heat medium liquid reservoir, 5, 10
... Heat exchange section, 8A, 8B ... Chamber, 12 ... Partition plate.

Claims (1)

[Scope of Claims] 1. A heat medium liquid reservoir 2 for storing a heat medium liquid, a steam chamber 6 for storing water vapor generated from the heat medium liquid reservoir 2,
The inside of the closed container 1, which is equipped with a heat exchange section 5 for exchanging heat between the water vapor in the steam chamber 6 and the fluid to be heated, is kept below atmospheric pressure, and the water vapor generated by heating the heat transfer liquid is transferred to the vapor. In a reduced pressure boiler configured to condense water in the chamber 6 and return the generated condensed water to the heat medium liquid reservoir 2, the heat medium liquid reservoir 2 is configured to contain water as a heat medium liquid. The condensed water generated in the steam chamber 6 is divided into a plurality of compartments: a water storage chamber 8B for storing water and a high-boiling heating medium storage chamber 8A for storing a high-boiling heating medium liquid made of an aqueous solution containing a substance that increases the boiling point. is returned to the water storage chamber 8B, and surplus water exceeding a certain amount is returned to the water storage chamber 8B.
is supplied into the high boiling point heat medium liquid storage chamber 8A, and by the high boiling point heat medium liquid in the high boiling point heat medium liquid storage chamber 8A,
A reduced pressure boiler characterized by being provided with a heat exchange section 10 for heating another fluid to be heated. 2. The reduced pressure boiler according to claim 1, wherein the boiling point raising substance is lithium bromide or calcium chloride. 3. Claim 1 or 2, wherein the high boiling point heat medium liquid storage chamber 8A is provided with a partition plate 12 that forms an ascending path A and a descending path B for convection circulation of the high boiling point heating medium liquid. The reduced pressure boiler described in .