JPS5831292A - Recovering method for heat of drain - Google Patents

Abstract

PURPOSE:To enable to securely recover the thermal energy of a drain, by a method wherein a high-temperature high-pressure drain is separated into a gas and a liquid, the vapors separated are directed into a cooler, and heat exchange is conducted. CONSTITUTION:An unstable drain at a high temperature and a high pressure is directed into a closed container 1 through an intake part 2 for the unstable drain, and is separated into a gas and a liquid. The liquefied drain is accumulated in the container 1, while the vapor separated are directed into the cooler 4 provided on the top face of the container 1. In the cooler 4, heat exchange is conducted between the vapor and cooling water which flows from an inflow port 8 for the cooling water to a discharging port 10 for the cooling water through an upper-stage heat-exchanging pipe 5a, an intermediate-stage heat-exchanging pipe 5b and a lower-stage heat-exchanging pipe 5c. Accordingly, the thermal energy of the drain can be securely recovered.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for recovering thermal energy from high temperature, high pressure drains.

Generally, heat is transferred for space heating and heating by steam, but after the heat has been transferred, the steam turns into condensate, and if this condensate is not removed, the heat transfer efficiency will deteriorate.

Furthermore, condensate is generally at high temperature and high pressure, and when discharged to atmospheric pressure, a large amount of condensate vaporizes in the form of flash steam. Recently, the thermal energy of drains has been utilized, but nothing has been done about flash steam. Drain is unstable unless it reaches a temperature of 100C or less under atmospheric pressure and cannot be reused in various ways.In order to stabilize the drain, it is necessary to remove heat (generate heat), but currently it is open to the atmosphere. Condensate was stored in a drain tank, and the method of capturing thermal energy for stabilizing the drain was to dissipate the thermal energy of the generated condensate to the surrounding area. Therefore, the thermal energy could hardly be used.

In view of the above points, the present invention provides a method for recovering heat from an unstable drain that reliably recovers the thermal energy of the unstable drain, stabilizes the drain, and obtains stable high-temperature cooling water. .

Hereinafter, the method of the present invention will be explained in detail with reference to the drawings.

1 and 2, reference numeral 1 denotes a closed container for gas-liquid separation, and an unstable drain intake section 2 is provided at one upper end of this closed container 1, and a stabilized drain outlet section 3 at the other lower end.
is provided.

4 is a cooler provided on the upper surface of the closed container 1 and in contact with the atmosphere, and this cooler 4 has three stages of heat exchange pipes 5a,
The continuous parts 5b and 5c are connected in a sealed manner by a ring-shaped backing 6, and the circumferential recess is covered with a heat insulating material 7.

A cooling water inlet 8 is provided at one lower end of the upper heat exchange pipe 5a, and is connected from the other upper end to one lower end of the middle heat exchange vibe 5b by a first connecting pipe 9a. The other upper end is connected to one lower end of the lower heat exchange vibe 5c by a second connecting pipe 9b, and a cooling water outlet 10 is provided at the other upper end of the lower heat exchange vibe 5c.

Inside the sealed container 1, there is a heat exchange pipe 11 connected to the cooling water outlet 10 of the lower heat exchange vibrator 5C.
is arranged so that the water can be taken out from the high-temperature water extraction part 12 by exchanging heat with the drain and bringing the temperature to equilibrium with that of the drain.

In addition, this high temperature water outlet 12 and the lower heat exchange vibe 5
A circulating vibrator 13 of warm water is connected to the cooling water outlet 10 of c, and is guided to the upper part of the cooler 4, and is introduced into the closed container 1 while making sufficient contact with the steam. Furthermore, heat recovery is more effective if a filler 14 such as a wire mesh is housed in the cooler 4 in order to improve the contact between the liquefied steam or the cooling water from the upper part of the cooler and the flash steam.

Therefore, if the condensate heat recovery device configured as described in E is used, the unstable condensate at high temperature and high pressure is introduced into the closed container 1 from the unstable condensate collection section 2, and the condensate is separated into gas and liquid and liquefied. The drain is stored in the closed container 1, and the separated steam is guided to the cooler 4 provided on the upper surface of the closed container 1, and the upper heat exchange vibe 5a is connected to the cooler 4 through the cooling water inlet 8.
Heat exchange is performed by contacting the cooling water flowing to the cooling water outlet 10 via the middle heat exchange vibe 5b and the lower heat exchange vibe 5c.

Furthermore, the cooling water discharged from the cooling water outlet 10 is guided to the closed container heat exchange pipe 11 in the closed container 1 as needed, and the cooling water is exchanged with the liquefied drain to reach an equilibrium temperature with the liquefied drain. The liquefied drain is taken out from the high temperature water take-out part 12 and the liquefied drain is taken out from the stabilized drain take-out part 3 as stabilized drain.

In this way, if the method according to this embodiment is used, the cooling water path in the cooler 4 is configured in multiple stages, and the cooling water temperature is set to a low temperature atmosphere on the upper side, so that efficient heat recovery is possible. Therefore, high temperature water can be obtained. moreover,
The cooling water is passed through the cooling water outlet 10 of the cooler 4 to the closed container 1.
If the water is led to the heat exchange pipe 11 inside the closed container, hot water at a much higher temperature can be obtained.

Next, another embodiment of the drain heat recovery method according to the present invention will be explained with reference to FIG. 3. The above embodiment describes a configuration in which cooling water flows from bottom to top in each path of cooling water. However, in this embodiment, each stage of heat exchange pipe 5a
, 5b, 5c are configured in a trap-like manner, so that the inside of the pipes is filled with cooling water and the same effect as described above can be obtained. In this embodiment, the same parts as those in the previous embodiment are designated by the same reference numerals, and their explanation will be omitted.

Although it is possible to use the hot water taken out from the cooling water outlet 8 or the high temperature water outlet 12 directly, in order to make it easier to control the temperature, a hot water storage tank is provided and the temperature, flow rate, etc. are adjusted. It can be made more effective.

Experimental examples are shown below. The experimental conditions in this experiment are the first
The heat exchange pipe used in the apparatus shown in the figure was one stage and had a cooling water temperature of 190°C.

Experimental example 1 (change 3 atm to 1 atm)
In order to obtain a drain 10 at 96°C from the stabilizing drain outlet 3, hot water 5V4 at 85°C was obtained from the cooling water outlet 10.

□ Experimental Example 2 (Reducing 5 atm drain to 1 atm) In order to obtain 10 drains at 97°C from the stabilized drain outlet 3, hot water ZKo at 88°C was obtained from the cooling water outlet 10.

Experimental Example 3 (!+ATM drain to 1 ATM) To obtain 95°C drain 10 from the stabilizing drain/removal part 3, 93°C hot water 4.5 to 4 from the high temperature water take-out part 12.
I got it.

Experimental example 4 (5 atm drain to 1 atm)
In order to obtain 10 kg of 96C drain from the stabilized drain outlet 3, 94℃ hot water 6.5 to 4
I got it.

As described above, the drain heat recovery method according to the present invention is
High-temperature, high-pressure condensate is guided into a sealed container to separate gas and liquid, and the liquefied drain is stored in the sealed container, and the separated steam is led from the sealed container to a cooler, where it is separated by cooling water flowing through the cooler. By performing heat exchange with the steam and then taking out the cooling water as hot water, the thermal energy of the drain can be reliably recovered. Furthermore, the hot water taken out from the cooler can be heat-exchanged again in the sealed container to generate hot water at a higher temperature. By extracting hot water, more stable high-temperature water can be obtained, and most of the thermal energy can be recovered.

[Brief explanation of the drawing]

The drawing shows the drain heat recovery method according to the present invention.
FIG. 1 is a schematic configuration diagram showing one embodiment, FIG. 2 is a vertical sectional view showing an extracted cooler portion, and FIG. 6 is a schematic configuration diagram showing another embodiment. 1 Airtight container, 4 Cooler, 5a, 5b, Sc
Heat exchange pipe, 8...Cooling water inlet, 10...Cooling water outlet Patent applicant Kanagawa Prefecture

Claims (2)

[Claims] (1) High-temperature, high-pressure condensate is guided into a sealed container to separate gas and liquid, and the liquefied drain is stored in the sealed container, and the separated vapor is led from the sealed container to a cooler where it circulates. A drain heat recovery method characterized by performing heat exchange with cooling water. (2) High-temperature, high-pressure drain is introduced into a closed container to separate gas and liquid, and the liquefied drain is stored in the closed container, and the separated vapor is led from the closed container to a cooler, where it is circulated through the cooler. 1. A method for recovering heat from a drain, characterized in that heat exchange is performed with the cooling water contained in the drain, and the cooling water is guided into the closed container to exchange heat with the high temperature/high pressure drain.