JPS5943300A - Evaporator of low boiling point fluid - Google Patents

Abstract

PURPOSE:To enhance evaporation capacity by providing a turbulent flow promoter in an evaporating pipe, so as to increase heat transfer quantity to low boiling point fluid to be heated. CONSTITUTION:Coiled turbulent flow promoters 22 are inserted in heat transfer pipes 20. Low boiling point fluid L such as LNG, LN2, or LPG to be supplied to a liquid header 10 enters the heat transfer pipes 20 and is heat-exchanged by a hot heat source fluid H thereby to heated and boiled. Then, such vapor in the pipes enters a vapor header 12. In this manner, the turbulent flow promoter 22 serves to form markable turnbulent flow in the liquid L in the heat transfer pipes 20, and allows the liquid to be always kept in contact with an inner wall of the pipes 20. Further, as liquid drop size is made small, the liquid may be readily evaporated and relieved of influence due to film boiling phenomenon. As a result, heat transfer quantity from the hot heat source H to the liquid L to be heated is widely increased, and accordingly evaporation quantity of the liquid L is remarkably increased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention utilizes liquefied natural gas (L N G l ), liquid nitrogen (
Evaporator f for vaporizing low boiling point fluids such as LN and l
It is related to

In recent years, the demand for LNG has been rapidly increasing due to changes in the energy supply and demand pattern, and there is a need for even higher performance and higher efficiency evaporators for vaporizing and evaporating.
It's coming.

Conventional 1. Low boiling point fluids such as G, LN, etc. 4. As an evaporator to vaporize seawater, etc., the thermal surface in the castle (there is one using sound, but the temperature between the heated I snout 1; y, 1 17. Luro thermal V
'LO-Isn't the entire device also larger? It was a good deal.

In addition, when low-boiling point liquids such as LNCi and LN2 are distributed throughout the heat transfer tube, 1. Te&i, Jh
The amount of heat generated by the so-called film boiling phenomenon is significant. Due to this film boiling phenomenon, the inner wall surface of the heat transfer tube is affected by chemical reaction 1. This phenomenon is caused by the force of being covered with a film by the gas generated.

The liquid is in direct contact with the inner wall surface I of the heat transfer tube. Therefore, if this film boiling phenomenon occurs, the amount of heat transfer will decrease significantly as described in 2. .

The present invention has been made to solve all of the problems of the prior art described above, and its objective is to provide a no-roller.

The amount of heat transferred to the low boiling point fluid that is the object to be heated is greatly increased, and the evaporation capacity of the low boiling point fluid is significantly increased.

The evaporator for low boiling point fluid of the present invention includes a high temperature heat source fluid circulation section, an evaporation tube for low boiling point fluid circulation disposed in the stream i+f1 section, and installed in the i+f1 section. Inside the evaporation tube &r-insertion turbulent flow,
A promoter is provided.

The present invention will be explained in more detail with reference to embodiments.

FIG. 1 shows a schematic diagram of an evaporator according to a practical example V of the present invention.
! '+' This is a sectional view of the installation part showing the jib. In the figure, 10.12 is a liquid header and a steam header, respectively.

Between the bars, each header I' (1, 12 tube sheets 14
゜16ff) and high temperature heat source 31f, 3tr of rest 11,
The continuous portion 18 forms a box 1. te (haru. So this style 1 mountain 1
~8 a day (vinegar (,7) is a large number of (7X fever' drunkenness 20.
20.20.・Is placed 1. The above liquid hetsushio'10 and steam ivy 12? The turbulence promoting body 22 is inserted (7'). Also, this 1-inch heat tube 20 i, + (nishi, j zo] 1, zo Jl-knee J ile shape σ) is inserted.

Liquid - Rada 10 Takumi - Supply 1,, IN (÷,
7 or a low boiling point fluid such as LPG 1. It flows into the heat exchanger tube 2 (2), is heated by heat exchange between the high-temperature heat source fluid 11 (2), becomes boiling steam, and flows into the steam header 12.

However, in the present invention, turbulence (Y-noy (1 body 22
is inserted into the heat exchanger tube 20, the liquid fluid inside the heat exchanger tube 20 has a markedly turbulent flow. As the droplet diameter of the fluid becomes smaller, it becomes easier to evaporate, and the effects of the film boiling phenomenon described above are alleviated.

Therefore, from the high temperature heat source 11 4) heated t) 1 body I7-
The transfer of heat of ＼ significantly increases υ [1, liquid g + Ii″
One evaporator increases significantly.

Moreover, the heat source is not one in the medium temperature range such as seawater, but a high temperature heat source with a much higher temperature than seawater. The evaporation of %'r, kj further increases.

Further, the turbulence promoting body 22 can obtain a sufficient effect by inserting only the film boiling region of the heat transfer tube 20. In addition, since the turbulence promoter 22 does not need to be in close contact with the inner wall of the tube 20, the coil diameter may be less than the inner diameter of the tube 20. Therefore, the turbulence promoter 22 may be inserted into the heat transfer tube 20. It is.

In addition, random jir, promoter and l, CIr;t, , 1 record 111 examples of co-il-shaped ones 22 (12&e, turtle 21'1-)i, ne-boi-like, ribbon-shaped thing 24
．． ；Jyroiha/\'71・21'i scree:'--
-21(', r JIVSU(jritamo(h 3 (1,
The shape is for one collar.
Ann in J Noh.

The present invention (F, come, high ¥1M heat source υ, [water; steam, 'combustion gas or υ'' combustion 1$: lj, hot water, various divine products - pieces, points organic gas, 1-others , Zeng, Y Jing 1jl:
(7') Ntun (book is for +'l'i)) Otsu.

t*rl! fノ)n f, +4s thing C a/・low l point;: +lt, fl- and (, -C7f, r, L N
G.

1, - N, , L)' G song, oxidized carbon 11L navy nos j, n (Y-body oxygen, etc. 17+'n, gas 1←
It is suitable for low boiling point applications such as -1.

According to JC, J, the present invention +7) i, l (If the evaporator is made of silicon flow, there is a large temperature difference between the heat source, the heated flow, and the rest.

Since the film boiling phenomenon is also effectively prevented, the heat transfer h4 from the heat source to the heated fluid is large.・Therefore, the amount of evaporation is j';-+ large, and the mounting part can be made smaller. ■The pressure loss inside the heat transfer tube is larger than when done by one person.
The same effects as when a throttle is provided at the J section are obtained, i1, 1, preventing drifting, and increasing Q, resulting in stable operation and improved driving performance.

[Brief explanation of the drawing]

FIG. 1 is a cross section showing a schematic configuration of the main parts of an evaporator according to an embodiment of the present invention (ㅅ1. FIG. 2 is false);
Resoha. Is it in front of the turbulence promoter? It is 1. 10- Liquid header, 12... Steam header, 18
...Heat source fluid distribution section, 20...Transmission (tube). 22.24.30...Turbulent flow, promoter. Agent: Tatsuyuki Unuma (and 2 others) Figure 1 Figure 2 Figure 4 559-

Claims (3)

[Claims] (1) High-temperature heat source fluid flow] 10 parts, a low boiling point fluid commercial evaporation pipe arranged in the flow part, a turbulence promoter inserted in the evaporation pipe, An evaporator for low boiling point fluids. (2) The low-boiling point fluid evaporator according to claim 1, wherein the high-temperature heat source fluid &' is a high-volume heat medium such as steam or combustion gas. (3) The low boiling point fluid includes liquefied natural gas, liquid nitrogen,
One or two of liquid acid wood and liquefied hydrocarbon gas fIf<
Claims 1. An evaporator for a low d-point fluid according to item 2 or 2.