JP3134903B2 - Absorber, condenser cooling water series condenser - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a condensing section of a heat recovery apparatus using a mixed medium comprising two or more components having different boiling points as a working fluid.

[0002]

2. Description of the Related Art A binary power generation system is an example of a heat recovery apparatus using a mixed medium. Referring to the binary power generation system shown in FIG. 3, the evaporator (2), the steam engine (4), the condenser (6) and the medium pump (8) are connected in series to form a closed loop (10). . The working fluid circulating in the closed loop (10) first evaporates by removing heat from the heat source fluid in the evaporator (2), and the generated steam is supplied to the steam engine (4). This steam expands in the steam engine (4) and serves to drive the generator (12). The steam discharged from the steam engine (4) is deprived of heat by the cooling water in the condenser (6) and condensed. The condensate is sent again to the evaporator (2) by the circulation pump (8).

When a mixed medium is used as a working fluid, the high-boiling component vapor starts to condense in the condenser (6) first, so that the concentration of the low-boiling component vapor increases near the heat transfer surface, which hinders heat transfer and mass transfer. Cheap. In order to remove the high-concentration vapor from the condenser (6), an absorber is installed on the outlet side of the condenser (6), and an unvaporized residual liquid having a low concentration of low-boiling components is led from the outlet of the evaporator (2). It has been proposed to absorb low-boiling component vapors.

[0004]

At this time, unless the pressure of the absorber is lower than the pressure of the condenser (6), the low-boiling component vapor of the condenser (6) cannot be led to the absorber. on the other hand,
Since the pressure of the mixed medium is determined by the temperature and the concentration, the concentration of the condenser (6) and the concentration of the absorber are higher in the absorber (FIG. 4), and the pressure of the absorber is higher at the same temperature. . In order to solve this, the temperature of the absorber needs to be lower than the temperature of the condenser (6).

It is an object of the present invention to create the above-mentioned temperature level to effectively remove uncondensed vapor having a high concentration of low boiling components from the condenser.

[0006]

According to the present invention, a cooling water passage is connected in series with an absorber and a condenser, and the coldest cooling water in the system is first passed through the absorber, and heat exchange is performed through the absorber. The cooling water whose temperature has been raised is passed through a condenser.

[0007]

[Function] The cooling water is first passed through the absorber, and the water heated by heat exchange through the absorber is passed through the condenser.
The absorber outlet temperature, and thus also the pressure, will be lower than the condenser. As a result, a steam flow from the condenser to the absorber is generated, the low-boiling component vapor accumulated near the outlet of the condenser is eliminated, and the concentration of the low-boiling component vapor in the condenser decreases.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG.
4) and a condenser (6) connected in series, and a cooling water pump (1
The cooling water from (6) is first transferred to the cooling water passage (14) in the absorber (14).
a), and then, through the absorber (14), the cooling water whose temperature has been raised by heat exchange passes through the cooling water passage (6) of the condenser (6).
a) Thereby, the medium passage (14) of the absorber (14) is compared with the medium passage (6b) of the condenser (6).
Since the outlet temperature of b) is lower, a steam flow from the condenser (6) toward the absorber (14) is generated, and the low temperature accumulated near the outlet of the medium passage (6b) of the condenser (6) is generated. Boiling component vapors are eliminated and the low boiling component vapor concentration in the condenser (6) is reduced.

Referring to the vapor-liquid equilibrium diagram of FIG.
Represents the condenser inlet vapor, represents the condenser outlet liquid, represents the condenser outlet vapor, represents the absorber inlet liquid, represents the absorber outlet liquid, and represents the absorber outlet vapor, and the drain pot (16) in FIG.
The vapor at the condenser outlet led from the gas phase to the absorber (14) is absorbed by the liquid at the inlet of the absorber, becomes the liquid at the inlet of the absorber and the vapor at the outlet of the absorber, and is collected in the liquid phase of the drain pot (16). The outlet liquid and the absorber outlet liquid are mixed to form a liquid represented by.

FIG. 1 simply shows the flow of the cooling water, but as shown in FIG. 2, a bypass with a valve (20) for connecting the cooling water inlet side and outlet side of the absorber (14). A pipe (18) is provided to control the proportion of cooling water going to the condenser (6) that has passed through the absorber (14) and that has not passed through the valve (20).
, The temperature of the cooling water at the inlet of the condenser can be adjusted.

[0011] When abundant cooling water is obtained,
The same effect can be obtained by setting the cooling water temperature of the absorber (14) lower than the cooling water temperature of the condenser (6) by making the cooling water systems of the condenser (6) and the absorber (14) independent of each other. Is obtained.

[0012]

According to the present invention, the cooling water passage is connected in series with the absorber and the condenser, and the coldest cooling water in the system is first passed through the absorber, and the temperature is raised by heat exchange through the absorber. Since the cooling water is passed through the condenser, the temperature at the outlet of the absorber, and hence the pressure, is lower than that of the condenser, and a steam flow from the condenser to the absorber is generated, and the vicinity of the outlet of the condenser is generated. The low-boiling component vapor accumulated in the condenser is removed, and the low-boiling component vapor concentration in the condenser is reduced. Thus, condenser performance is improved and system efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment.

FIG. 2 is a block diagram showing a modification.

FIG. 3 is a block diagram of a binary power generation system.

FIG. 4 is a vapor-liquid equilibrium diagram of a mixed medium in a condenser and an absorber.

[Explanation of symbols]

 6 Condenser 6a Cooling water passage 14 Absorber 14a Cooling water passage

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kio Yamazaki 3-4-6, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Inside Hisaka Works Co., Ltd. 1-82 Kyushu Electric Power Co., Inc. No. 82 Kyushu Electric Power Co., Inc. (56) References JP-A-5-280813 (JP, A) JP-A-5-60405 (JP, A) JP-A-3-134207 (JP, A) 5-263610 (JP, A) Japanese Utility Model 2-81366 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F01K 25/10 F01K 25/00

Claims (1)

(57) [Claims] 1. A heat recovery apparatus using a mixed medium as a working fluid, comprising an absorber for absorbing uncondensed vapor staying in the vicinity of a heat transfer surface of a condenser by liquid and removing the condensed vapor, absorbing a cooling water passage. It is connected in series with a condenser and a condenser, the coldest cooling water in the system is first passed through the absorber, and the cooling water heated by heat exchange through the absorber is passed through the condenser. Absorber, condenser cooling water series condenser.