KR980010316A - Liquefied natural gas calorific control facility - Google Patents

Abstract

The present invention discloses a natural gas calorific value adjustment apparatus capable of mixing liquefied petroleum gas in the course of raising the temperature of the liquefied natural gas after the vaporization thereof in order to adjust the calorific value of the liquefied natural gas having insufficient heat.

The present invention is characterized in that seawater is circulated around a plurality of double pipes constituted by an inner pipe and an outer pipe to vaporize the vaporized natural gas and pass the vaporized natural gas through a heat transfer pipe to raise the temperature, Gas nozzles and a dispersing wall are provided to increase the time for setting the natural gas vaporized by the pivoting means to improve the heat exchange efficiency so as to rapidly raise the temperature of the gasified gas so that the liquid droplets of the liquefied petroleum gas can be evaporated smoothly, So that it is possible to control the amount of heat stably by improving the mixing efficiency.

Accordingly, it is possible to supply natural gas of stable quality by adjusting the amount of heat when the amount of heat of the liquefied natural gas is insufficient or when the amount of heat of the supply is increased, and it is easy to control the amount of heat, have.

Description

Liquefied natural gas calorific control facility

FIG. 1 is an explanatory view showing a general natural gas calorific value adjustment facility.

2 (a) and 2 (b) are explanatory views showing an open rack type LNG vaporizer heat exchanger device generally used in FIG. 1;

FIG. 3 is a general explanatory view showing a natural gas calorific value adjusting facility according to the present invention. FIG.

FIG. 4 is an explanatory view showing the turning part of the natural gas calorific value adjustment facility according to the present invention. FIG.

FIG. 5 is a vertical cross-sectional view showing the structure of the dispersion wall in the natural gas calorific capacity control equipment according to the present invention. FIG.

FIG. 6 is an explanatory view showing a turning means, a nozzle, and a dispersion wall among the natural gas heat quantity adjusting devices according to the present invention. FIG.

FIG. 7 is a vertical sectional view showing a pin formed in an inner tube and an outer tube of the double tube according to the present invention; FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

101: LNG Header 102:

103: Seawater hydropower device 104: NG Header

1: inlet 2: inner tube

3: outer tube 4: double tube

5: joining room 6: exit

7: exhaust port 8:

9: heat transfer pipe 10:

11: Baffle 12:

13: Seawater inlet 14: Seawater outlet

15: liquefied petroleum gas tank 16: pump

17: nozzle 18: spiral guide

19: turning means 20: dispersing wall

21: heating means 22: pin

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a calorific value control apparatus capable of increasing the calorific value of a natural gas which is insufficient in calories.

LNG is an abbreviation for Liquified Natural Gas. It is a colorless, odorless transparent -162 ° C ultra-low-temperature liquid which is cooled to the natural gas origin and cooled down to 1/600 in order to transport and store the natural gas extracted from underground. It says. LNG (Liquefied Natural Gas) is transported to LNG receiving bases by LNG transport in the mountains and stored in specially manufactured LNG storage tanks. LNG is vaporized in LNG vaporizer to supply to customers.

These liquefied natural gas are different from each other according to the production area of the world, and thus the caloric value ranges from 9,500 to 11,200 Kc al / Nm ³ depending on the LNG production area.

In order to supply LNG with low calorific value or to increase the reference calorific value in accordance with the diversification of LNG importing countries for stable supply of natural gas, it is necessary to inject liquefied petroleum gas (LPG), which is larger in calories than natural gas, A calorie control process is required.

Conventional techniques for adjusting the natural gas calorific value include 1) a method of injecting and mixing propane gas vaporized in a gasified natural gas (gas-liquid mixture method), 2) a method of injecting and mixing vaporized natural gas liquid propane (Gas-liquid mixture method), and 3) liquid propane is injected into liquid LNG (liquid-liquid mixture method).

Among the above three methods, the second method is widely used because it is easy to control the mixing and calorific value and is advantageous in terms of economy, stability and operation performance.

This second method process is shown in the first diagram. As can be seen, conventionally, LNG is vaporized by an open-rack type LNG vaporizer or the like, and then LPG is injected in the mixer to mix the LPG with the sensible heat of the natural gas, or the gasification temperature of the natural gas is low In case of LPG vaporization heat source, separate seawater is supplied to vaporize LPG and mix with natural gas to supply to the customer.

A typical calorie control system is shown in a first view, and a heat exchanger of an open rack type LNG vaporizer used at this time is shown in FIG. This is because LNG of -162 캜 introduced from the LNG header 101 is vaporized while passing through the heat transfer pipe 102 and discharged to the natural gas supply pipe through the NG header 104. At this time, So that the LNG is vaporized to 0 DEG C or higher while the temperature of the LNG rises due to the heat input from the seawater.

As can be seen from the above, in the related art, the natural gas vaporized through the open rack type LNG vaporization heat exchanger is mixed with the LPG supplied from the LPG tank to be mixed and sent out.

Accordingly, when the natural gas temperature before mixing is low, the evaporation of LPG is not smooth, the LNG vaporization is dispersed, and the mixing system is dispersed to complicate the control system configuration. Since the LPG gasification rate depends on the natural gas temperature at the inlet of the gasifier, And in particular, in winter, the temperature of the natural gas is lowered due to the low temperature of the seawater, which is the reason for heating the LNG vaporizer, so that the range of increasing the calorific value is reduced.

Further, according to this conventional method, the mixer must be separately manufactured and installed, which requires a large installation area and high investment cost.

SUMMARY OF THE INVENTION In view of the above-described problems, it is an object of the present invention to provide a method and apparatus for controlling LNG vaporization and calorific value simultaneously in one casing, unlike the conventional method of separately installing an LNG vaporizer and a calorific value adjustment facility Equipment.

According to an aspect of the present invention, there is provided a liquefied natural gas heat exchanger device for a liquefied natural gas (LPG) gas, comprising: a gasification section composed of a plurality of double tubes composed of an inner tube and an outer tube and a heat transfer section connected to an outlet and an outlet of a confluence chamber; , And a natural gas heat quantity regulating device having a spray nozzle connected to the LPG pressure sending means and a mixing means is provided on the heat transfer pipe (9) of the temperature rising portion.

According to the present invention, since the liquefied natural gas is vaporized and heated, the liquefied natural gas can be injected and mixed with the liquefied petroleum gas at the same time, so that a separate mixer is unnecessary, thereby reducing the facility investment cost and the occupied area.

In addition, since LNG vaporization, LPG mixing, and mixed gas heating are simultaneously performed in one apparatus, the application of the calorimetric control technology becomes easy.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 3 shows a liquefied natural gas calorific value control system according to the present invention.

As can be seen from the above description, the present invention is characterized in that a plurality of double pipes 4 and a confluence chamber 5 each having an injection port 1 for injecting liquefied natural gas, an internal pipe 2 and an external pipe 3, And a heat transfer pipe 9 connected to the outlet 6 and the discharge port 7 of the confluence chamber 5. The gasification unit 8 and the temperature rise unit The baffle 11 is installed between the sea water inlet 13 and the seawater outlet 14 so that a circulation path 12 is formed between the sea water inlet 13 and the seawater outlet 14. The liquefied petroleum gas tank 15 constituted by a spiral guide 18 and a heating wall 20 constituted by a dispersing wall 20 are arranged before and after the nozzle 17 and the nozzles 17 connected to the pump 16, (21).

In the present invention as described above, the liquefied natural gas flows in through the inlet port and returns to the outer pipe 3 via the inner pipe 2 to join in the confluence chamber 5.

Accordingly, the liquefied natural gas is vaporized in the inner pipe 2, heated in the outer pipe 3, merged in the confluence chamber 5, heated in the heat transfer pipe 9 of the temperature-rising portion 10, .

In the present invention, in particular, the liquefied natural gas differs in the amount of heat from the source to the liquefied natural gas, and thus the liquefied petroleum gas is injected in order to adjust the amount of heat to be supplied or the amount of heat to be supplied is increased. This LPG mixing means is provided with an LPG injection nozzle 17 as a liquid to inject and spray liquid, so that liquid LPG in a spray state is vaporized by the sensible heat of the natural gas and mixed with the natural gas, and at the same time, The temperature of the mixed gas is raised. At this time, in the present invention, heat exchange with seawater is actively performed by the pivoting means 19 and the dispersion wall 20 as listed below, so that the vaporizing gas temperature for LPG evaporation is rapidly raised, So that it is possible to control the amount of heat stably.

That is, in the present invention, the natural gas is rotated by the pivot means 19 provided before the nozzle 17.

That is, the spiral guide 18 rotates the passing natural gas. In order to enable sufficient rotation, the spiral guide 18 is provided on the heat transfer pipe 9 of the temperature-rising portion 10 as shown in the third figure. I have installed.

Therefore, heat exchange efficiency with the seawater is improved, so that heat can be provided to smoothly evaporate the droplets of the LPG injected from the nozzles 17. Further, as shown in the sixth aspect, in the present invention, The liquefied petroleum gas injected by the nozzle 17 is effectively mixed by the rotating natural gas and dispersed by being dispersed on the dispersion wall 20 so that the liquefied petroleum gas injected by the nozzle 17 can be effectively mixed again. The temperature of the natural gas can be further increased, so that the temperature can be maintained at 0 ° C or more in the winter even when the season changes.

As a result, the calorific value of the vaporized natural gas can be adjusted upward by effectively mixing the liquefied petroleum gas and the natural gas.

Accordingly, the present invention can function as an LPG mixer in which natural gas is heated to 0 ° C or higher by the heat transfer pipe 9, and at the same time, liquefied petroleum gas (LPG) is injected and mixed.

In addition, the heat exchanger for LNG vaporization used in the present invention is structurally disadvantageous in that stress due to high pressure LNG inflow of more than 40 bar, vibration generated by vaporization, and internal part of the inner tube (2) The pipe inside the dual pipe 4 is longer than necessary due to the difference in the heat transfer rate between the LNG which is the liquid and the natural gas which is the gas outside the dual pipe 4. To solve this problem, The use of the heat transfer pipe 9 with the pin 22 on the outside allows the support 22 to suppress the vibration of the heat transfer pipe 9 due to the contact between the fin 22 and the outer pipe 3 and the heat transfer rate difference between the inside and the outside of the LNG evaporation pipe It is possible to satisfy both the heat transfer area and the heat transfer area.

As described above, according to the present invention, it is possible to reduce the facility investment cost, reduce the installation area, and adjust the calorific value in comparison with the conventional technology in which the carburetor and the calorific value adjustment facility are separately provided.

In addition, the present invention enables smooth heat exchange by seawater circulating around the circulation means 19 and the dispersion means while the vaporized natural gas passes through the temperature increase portion 10, The liquid droplets of the LPG injected upwardly are rapidly evaporated, and the calorific value of the natural gas is adjusted in a stable state.

Although the spiral guide 18 is used as the pivoting means 19 in the present invention, a similar effect can be obtained by providing a spiral groove on the inner wall of the tubular body. However, it is needless to say that a jaw having various cross-sectional shapes may be formed and used.

Claims (4)

A vaporizing portion 8 provided with a plurality of double tubes 4 and a confluence chamber 5 provided with an injection port 1 for injecting liquefied natural gas and an internal tube 2 and an external tube 3, A heating section 10 composed of a heat transfer pipe 9 connected to an outlet 6 and an outlet 7 of the chamber 5 and a baffle 11 provided between the gasification section 8 and the temperature rising section 10, 12 connected to the liquefied petroleum gas tank 15 and the pump 16 at one side of the heat transfer pipe 9 of the temperature raising section 10 so that the seawater inflow port 13 and the seawater discharge port 14 are connected to each other. Wherein a nozzle (17) is provided and a pivot means (19) and a heating means (21) are provided before and after the nozzle (17). 2. The natural gas calorie regulating apparatus according to claim 1, wherein the pivot means (19) comprises a spiral guide (18). 2. The natural gas calorie regulating apparatus according to claim 1, wherein the heating means (21) comprises a dispersion wall (20). 2. The natural gas calorie control system according to claim 1, characterized in that the fins (22) are attached to the inner tube (2) and the outer tube (3) of the dual tube (4). ※ Note: It is disclosed by the contents of the first application.