JPH0124521B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a condensation method in which two types of vapor having different condensation temperatures are simultaneously cooled and condensed using the same cooling water by narrowing the environmental temperature (cooling water temperature).

Conventional configuration and its problems Conventionally, when condensing steam whose condensation temperature is lower than a predetermined environmental temperature and steam whose condensation temperature is higher than a predetermined environmental temperature, the condensation of the steam whose condensation temperature is lower than the predetermined environmental temperature is carried out using a dedicated refrigerator. This was done by generating low-temperature water or brine. Therefore, in addition to requiring energy to drive the refrigerator, conventional horizontal absorption refrigerators had the problem that condensate accumulated in the horizontal pipes, reducing heat transfer efficiency.

Purpose of the Invention The present invention has been made to solve the above conventional problems, and uses a dedicated refrigerator to condense steam whose condensation temperature is lower than a predetermined environmental temperature and steam whose condensation temperature is higher than a predetermined environmental temperature. It is an object of the present invention to provide a method for condensing two types of steam, which can reduce the cooling load of the entire system by condensing steam with a low condensation temperature.

Composition of the Invention In order to achieve the above object, the present invention provides a method for condensing a first vapor whose condensation temperature is lower than a predetermined environmental temperature and a second vapor whose condensation temperature is higher than a predetermined environmental temperature.
of the vapor into the heat exchanger tube of the evaporator of the other medium,
The refrigerant forming a falling liquid film on the outer peripheral surface of the heat exchanger tube is evaporated and cooled and condensed, and the refrigerant heated and evaporated by the heat of condensation at that time is guided to the absorber, and the liquid that falls on the outer peripheral surface of the heat exchanger tube of the absorber is The concentrated absorption liquid forming a film absorbs the vapor, and the absorbed heat is removed by cooling water guided into the heat transfer tube of the absorber, and the dilute absorption liquid that has absorbed the vapor is sent to the regenerator via the recovery device. and condensing the second vapor guided into the heat transfer tube of the regenerator, evaporating the refrigerant from the dilute absorption liquid with the heat of condensation to obtain a concentrated absorption liquid, and guiding the refrigerant vapor to the condenser. It is configured to be cooled by the primarily heated cooling water introduced into the heat transfer tube of the condenser, and the heat of condensation of the steam whose condensation temperature is lower than the predetermined environmental temperature is transferred to the cooling water through the refrigerant and absorption liquid. to primarily heat the cooling water,
This primary heated cooling water can be used to condense steam whose condensation temperature is higher than a predetermined environmental temperature, so there is no need to use a dedicated refrigerator to condense steam whose condensation temperature is lower than a predetermined environmental temperature. It is possible to simultaneously condense two types of vapor with different values, reducing the cooling load on the entire system.

Embodiment and Operation An embodiment of the present invention will be described below based on the drawings. FIG. 1 is a flow sheet diagram of the condensation method according to the present invention, and FIG. 2 is a diagram showing the pressure and temperature in each state of cooling water and absorption liquid. In the drawing, 1
2 is a first steam having a temperature of 29° C.; 2 is an evaporator; inside the evaporator 2, a heat exchanger tube 3 through which the first steam 1 is guided from above is disposed vertically; Water at a predetermined temperature, which is the refrigerant 5 supplied by the refrigerant pump 4, forms a falling liquid film on the outer peripheral surface of the refrigerant. Reference numeral 6 denotes an absorber, and heat transfer tubes 8 through which cooling water 7 flows are disposed vertically in the absorber 6. On the outer peripheral surface of the heat transfer tubes 8, concentrated lithium bromide (absorbing liquid) ( LiBr) solution 9 forms a falling liquid film. Reference numeral 10 denotes a communication hole for guiding the refrigerant 5 that has become vaporized in the evaporator 2 to the absorber 6. 11
is a recovery device that absorbs the refrigerant 5 that has become vapor in the absorber 6 to form a dilute lithium bromide (LiBr) solution 12.
Collect the absorbed liquid. 13 is a pump for the dilute lithium bromide (LiBr) solution 12, 14 is a regenerator, and the regenerator 14 has an internal temperature of 65
Heat exchanger tubes 16 to which the second steam 15 at temperature is guided are arranged in the vertical direction, and a dilute lithium bromide (LiBr) solution 12 supplied from the collector 11 forms a falling liquid film on the outer peripheral surface of the heat exchanger tubes 16. is formed. 1
Reference numeral 7 designates a pump for the concentrated lithium bromide (LiBr) solution 9 for sending the absorbed liquid, which has become a concentrated lithium bromide (LiBr) solution 9 by evaporation of water in the regenerator 14, to the recovery device 11. Reference numeral 18 denotes a condenser, and within the condenser 18, heat transfer tubes 19 are disposed vertically, through which the cooling water 7 whose interior has been primarily heated by the absorber 6 is guided. 20 is a communication hole for guiding the vapor evaporated from the dilute lithium bromide (LiBr) solution 12 in the regenerator 14 into the condenser 18.

Next, a cycle of the condensation method according to the present invention will be explained. For example, when the dry bulb temperature is 35°C and the wet bulb temperature is 30°C, the first vapor 1 at a temperature of 29°C falls into a liquid film on the outer peripheral surface of the heat exchanger tube 3 while flowing down inside the heat exchanger tube 3 of the evaporator 2. is condensed by the latent heat of evaporation of the refrigerant at a temperature of 26.5°C and a pressure of 26 mmHg, and is discharged from the lower side of the evaporator 2 as water 21 at a temperature of 29°C. The state of the refrigerant 5 at this time is indicated by E in FIG.

The refrigerant 5 evaporated in the evaporator 2 flows into the absorber 6 through the flow holes 10 and is absorbed by the concentrated lithium bromide solution 9 forming a falling liquid film on the outer peripheral surface of the heat transfer tube 8 of the absorber 6. Now, as shown by A in FIG. 2, the solution 9 with a concentration of 41.5% becomes a dilute lithium bromide solution 12 with a concentration of 38.5% under a pressure of 26 mmHg, and due to the absorbed heat at this time, the heat exchanger tube 8 The cooling water 7 flowing upwardly inside the chamber facing the concentrated lithium bromide solution 9 on the outer peripheral surface is primarily heated from 30°C to 33.1°C. The dilute lithium bromide solution 12 is recovered by the recovery device 11 and then supplied to the regenerator 14 .
The temperature inside the heat transfer tube 16 of the regenerator 14 is 65°C from above.
A second steam 15 is introduced, and the second steam 15 is
The refrigerant 5 dissolved in the dilute lithium bromide solution 12 with a concentration of 38.5%, which forms a falling liquid film on the outer peripheral surface of the heat transfer tube 16, is evaporated, and the latent heat of this evaporation condenses the water 22 at a temperature of 65°C. Tonatte Regenerator 14
is discharged from the bottom of the

Dilute lithium bromide solution 12 in regenerator 14
becomes a concentrated lithium bromide solution 9 with a concentration of 41.5%, as shown by R in FIG.

In the condenser 18, the refrigerant 5 that has been turned into vapor in the regenerator 14 flows into the flow hole 20, and flows down through the heat transfer tubes 19 of the condenser 18 to a primary heated temperature 33.1.
It contacts and condenses with the cooling water 7 at 33.1°C through the heat transfer tube 19, and uses the latent heat of this condensation to secondarily heat the cooling water 7 at 33.1°C to 36°C. The state of the refrigerant 5 at this time is indicated by C in FIG.

In the illustrated example, the absorbing liquid is a lithium bromide solution, but it is not limited to this.

In addition, in the illustrated example, the heat transfer parts provided in the evaporator 2, absorber 6, regenerator 14, and condenser 18 are heat transfer tubes 3, 8, 16, and 19 which are tube bodies, but plate-shaped heat transfer parts are used. It is also possible to use so-called plate heat exchangers with surfaces.

Effects of the Invention As explained above, according to the method according to the present invention, power costs and heat sources (steam, oil, etc.) for condensing the first steam whose condensation temperature is lower than the predetermined environmental temperature are almost unnecessary. At the same time, there is no need for another indirect medium such as cold water or brine to condense the first vapor. Furthermore, the amount of heat that is finally dissipated into the environment through cooling water, etc. is determined by the heat equivalent of the power and heat source used to drive the refrigerator that condenses the first steam, in addition to the first and second steam. However, since they are not necessary, thermal pollution to the environment is reduced and the cooling load on the system can be reduced. In addition, since condensate does not accumulate inside the heat transfer tube, it has the advantage that heat transfer efficiency can be improved.

[Brief explanation of drawings]

FIG. 1 is a flow sheet diagram of the condensation method according to the present invention, and FIG. 2 is a diagram showing the pressure and temperature in each state of cooling water and absorption liquid. DESCRIPTION OF SYMBOLS 1... First steam, 2... Evaporator, 3... Heat transfer tube (heat transfer part) of evaporator, 5... Refrigerant, 6... Absorber, 7... Cooling water, 8... Absorber Heat transfer tube (heat transfer section), 9, 12... Absorption liquid, 11... Recovery device, 1
4... Regenerator, 15... Second steam, 16... Heat transfer tube (heat transfer part) of regenerator, 18... Condenser, 19
...Heat transfer tube (heat transfer section) of the condenser.

Claims (1)

[Claims] 1. When condensing a first vapor whose condensation temperature is lower than a predetermined environmental temperature and a second vapor whose condensation temperature is higher than a predetermined environmental temperature, the first vapor is transferred to a heat transfer section of an evaporator of another refrigerant. The refrigerant is condensed with the refrigerant forming a falling liquid film on the outer surface of the heat transfer part, and the refrigerant heated and evaporated by the heat of condensation is guided to the absorber, and the liquid falling on the outer surface of the heat transfer tube of the absorber is The refrigerant is absorbed into the concentrated absorption liquid forming a film, the heat of absorption at that time is cooled and removed by cooling water led to the absorber, and the diluted absorption liquid that has absorbed vapor in the absorber is passed through the recovery device. and lead it to the regenerator,
Condensing the second vapor guided into the heat transfer part of the regenerator, evaporating the refrigerant from the dilute absorption liquid with the heat of condensation to obtain a concentrated absorption liquid, and guiding the refrigerant vapor to the condenser, A method for condensing two types of steam, characterized in that the condensation is carried out by cooling water introduced into a condenser. 2. The method for condensing two types of vapors according to claim 1, characterized in that water is used as the refrigerant and lithium bromide aqueous solution is used as the absorption liquid.