KR102286703B1 - Thermal medium process system and ship having the same - Google Patents

Abstract

A heat treatment system according to an embodiment of the present invention is a system for supplying heat to a vaporizer for vaporizing liquefied gas, comprising: a heat heater for heating the heat as a heat source; a heat source generating unit for producing a heat source and supplying it to the heat source heater, and heating the condensed water cooled by the heat source in the heat source heater to produce a heat source; and a drain cooler for cooling a heat source including at least some liquid phase by being cooled by a heat medium in the heat medium heater, wherein the heat medium heater and the drain cooler are parallel based on the flow of heat and in series based on the flow of the heat source characterized in that it is provided.

Description

Thermal medium process system and ship having the same}

The present invention relates to a heat treatment system and a ship including the same.

Recently, as environmental regulations are strengthened, the use of liquefied natural gas, which is close to an eco-friendly fuel, among various fuels is increasing. Liquefied natural gas is generally transported through LNG carriers, and at this time, the liquefied natural gas can be stored in the tank of the LNG carrier in a liquid state by lowering the temperature to -162°C or less under 1 atm. When liquefied natural gas becomes liquid, its volume is reduced to 1/600 compared to the gaseous state, so transport efficiency can be increased.

However, since liquefied natural gas is generally consumed in a gaseous state rather than in a liquid state, liquefied natural gas stored and transported in a liquid state needs to be regasified, so a regasification facility is used.

At this time, the regasification facility may be mounted on a vessel such as an LNG carrier, FLNG, FSRU, or the like, or may be provided on land, and the regasification facility implements regasification by heating the liquefied natural gas using a heat source such as seawater.

However, since liquefied natural gas is placed in a cryogenic state close to -160°C, if the temperature difference with the heat source during heat exchange is widened, problems may occur, such as the durability of the heat exchanger that heats the liquefied natural gas. In addition, when liquefied natural gas is heated using seawater, corrosion may occur in the heat exchanger.

Therefore, in recent years, in the process of regasification of liquefied natural gas stored in the liquid phase, a lot of research and development has been made in the direction of simplifying the regasification facility while stably operating various components.

The present invention was created to improve the prior art, and an object of the present invention is to provide a heat treatment system capable of increasing thermal efficiency and improving design and arrangement due to space constraints, and a ship including the same.

A heat treatment system according to an embodiment of the present invention is a system for supplying heat to a vaporizer for vaporizing liquefied gas, comprising: a heat heater for heating the heat as a heat source; a heat source generating unit for producing a heat source and supplying it to the heat source heater, and heating the condensed water cooled by the heat source in the heat source heater to produce a heat source; and a drain cooler for cooling a heat source including at least some liquid phase by being cooled by a heat medium in the heat medium heater, wherein the heat medium heater and the drain cooler are parallel based on the flow of heat and in series based on the flow of the heat source characterized in that it is provided.

A ship according to another embodiment of the present invention is characterized in that it has the heat treatment system.

Specifically, it may further include a heat pump for transferring the heat to the heat heater.

Specifically, a heat medium line provided so that heat is recovered from the heat medium heater to the vaporizer via the vaporizer and closed circulation; a first branch line branched from the heat medium line and provided so that heat heat bypasses the heat heat heater and is supplied to the vaporizer via the drain cooler; and a second branch line which is branched from the heat medium line and is provided so that heat is supplied to the vaporizer by bypassing the heat medium heater and the drain cooler.

Specifically, it may further include a heat source line provided so that the heat source is supplied from the heat source generator to the heat source generator via the heat medium heater and the drain cooler.

Specifically, it may further include a valve for controlling the flow rate of the heat medium flowing into the drain cooler according to at least one of liquefied gas flow rate, liquefied gas temperature, heat medium flow rate, heat medium temperature, heat source flow rate, and heat source temperature.

The heat treatment system and the ship including the same according to the present invention can suppress flash steam and stabilize the condensate by cooling the condensate discharged from the heat heater in the drain cooler, and can omit the condensate tank where the condensate must stay. Design and layout due to space constraints can be improved.

1 is a conceptual diagram illustrating a heat treatment system according to an embodiment of the present invention.
FIG. 2 is a conceptual diagram illustrating a flow of a heat source in FIG. 1 .
3 is a conceptual diagram illustrating the flow of fruit in FIG. 1 .
4 is a view showing the condensate line and the entire line in FIG. 1 .

The objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings. In the present specification, in adding reference numbers to the components of each drawing, it should be noted that only the same components are given the same number as possible even though they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a conceptual diagram illustrating a heat treatment system according to an embodiment of the present invention, FIG. 2 is a conceptual diagram illustrating the flow of a heat source in FIG. 1, and FIG. 3 is a conceptual diagram illustrating the flow of heat in FIG. 1, 4 is a view showing the condensate line and the entire line in FIG. 1 .

1 to 4 , a ship (not shown) according to an embodiment of the present invention may be a FSRU, an LNG carrier, etc., but is not limited thereto. can have

The heat treatment system 100 is a system that supplies heat to the vaporizer 10 that vaporizes liquefied gas, and includes a heat heater 110 , a heat source generator 120 , a drain cooler 130 , a heat pump 140 , It includes a heat-heat line 150 , a first branch line 151 , a second branch line 152 , and a heat source line 160 .

Note that the heat source is 　condensate, 　steam, and 　drain (some of the steam is condensed), and it is expressed differently depending on the state.

The heat medium heater 110 may heat the heat medium (which may be glycol water) as a heat source. For example, a heat medium heater can heat the cooled heat medium, heat-exchanging with liquefied gas. At this time, the present embodiment may use steam.

Therefore, the heat medium heater 110 uses steam to heat the heat medium. The heat medium heater 110 may be a heat exchanger of a similar type to the vaporizer 10 , and transfer the heat contained in the steam to the heat medium so that the heat medium is heated.

The heat medium heater 110 may be formed in parallel with the drain cooler 130 and the flow of the heat source, and may be provided in series based on the drain cooler 130 and the flow of the heat source.

Therefore, as shown in FIGS. 3 and 4 , the heat heater 110 is provided on the heat line 150 to be described later, and the drain cooler 130 is connected to the first branch line 151 and the heat source line 160 . Provided, the first branch line 151 is branched from the heat-heat line 150 to form a parallel structure, so that the heat-heat heater 110 and the drain cooler 130 can be made in parallel based on the heat-heat flow. And, as shown in FIG. 2 , the heat medium heater 110 may be provided in line with the drain cooler 130 on a heat source line 160 to be described later and may be formed in series.

Accordingly, the heat medium may exchange heat with the heat source in the heat medium heater 110 , and the temperature of the condensed water may be controlled while selectively passing through the drain cooler 130 through the control of the valve.

In addition, the heat source heated by the heat source in the heat medium heater 110 may be supplied to the vaporizer 10 to heat and regasify the LNG. On the other hand, the heat source (condensed state) cooled by the heat in the heat medium heater 110 may be re-introduced into the heat source generating unit 120 to be reheated with steam.

On the other hand, to prevent the condensed steam from re-evaporating, that is, for stabilizing condensate (a gas phase is prevented from occurring in the condensate to stabilize the flow), a drain cooler 130 may be provided as will be described later.

The heat source generating unit 120 (regas boiler) produces a heat source and supplies it to the heat medium heater 110 , and heats the condensed water cooled by heat in the heat medium heater 110 to produce a heat source.

For example, the heat source generator 120 may be formed of a boiler, and may be provided in series with the heat source heater 110 and the drain cooler 130 on a heat source line 160 to be described later.

In addition, a heat source line 160 is formed in the heat source generating unit 120 to supply steam as will be described later, and a valve for controlling the flow rate of the heat source may be provided on the heat source line 160 .

Here, the valve may include a main valve 167 and a warm-up valve 167A, which are provided downstream of the heat source generator 120 on the heat source line 160 , the main valve 167 controls the flow rate, and a warm-up valve 167A may branch from the heat source line 160 to preheat the heat source line 160 . At this time, the steam preheated by the heat source line 160 through the warm-up valve 167A may be discharged to the outside and discarded.

When the warm-up valve 167A is used after the heat treatment system 100 is not used for a long time, when the heat source line 160 and the main valve 167 are both lowered to room temperature, the operation is started immediately. This is to solve the problem of generating a large amount of condensate.

That is, by sufficiently preheating the heat source line 160 and the main valve 167 through the warm-up valve 167A to prevent a sudden temperature change, the thermal fatigue degree of the heat treatment system 100 can be reduced.

A known steam generating mechanism may be applied to the heat source generating unit 120 , and a detailed description thereof will be omitted in lieu of a known technique.

The drain cooler 130 is a configuration for suppressing flash steam generation, and is cooled by the heat medium in the heat medium heater 110 to cool the heat source including at least a part of the liquid phase, so that all the steam is sufficiently condensed to become condensed water. there is.

The heat source cooled by the drain cooler 130 lowers the condensed water temperature, thereby reducing flash steam generation and preventing water hammer. In addition, since the heat medium for cooling the condensed water is supplied through the drain cooler 130 and can be added as a heat medium to be originally supplied (a part of the heat medium supplied to the fruit heater 110 is bypassed and supplied), the heat medium heater 110 ) can reduce the amount of heat source supplied.

Here, as shown in FIG. 4 , the condensate line 160A (which may be included in the heat source line 160 ) passing through the drain cooler 130 is disposed to pass through the double bottom, and the heat medium heater 110, the drain cooler 130, etc. are provided on the deck (not shown), so that the heat source pump, which is a pump for recovering condensed water, can be omitted, so that the structure can be simplified. It may be supplied to the heat source generator 120 via the feeding tank 165 .

Here, the deck on which the drain cooler 130 is disposed may be a deck warehouse just below the bow deck as a bosun store, and at the end of the condensate line 160A provided via the double bottom, as mentioned above. A feeding tank 165 may be provided to recover steam.

In addition, when condensate re-evaporates in the condensate line 160A in which the condensate descends vertically, hammering may occur if rapid condensation of the re-evaporated steam occurs. In this embodiment, the drain cooler Condensate is formed by 130, so hammering can be reduced, as well as pressure on the condensate line 160A (Condensate Line) to prevent vacuum generation due to the vertical drop of the condensate line 160A for more stable system operation Various modifications are possible as the control valve 151B (Pressure control valve) may be provided.

In addition, the pressure control valve 151B, the feeding tank 165, the heat source generator 120, the main valve 167 in the engine room that can be located downstream of the condensate line 160A via the double bottom. ), a warm-up valve (167A) may be provided, but is not limited thereto.

The heat pump 140 (GW pump) may deliver the heat to the heat heater 110 , and the heat discharged from the heat heater 110 may be delivered to the vaporizer 10 .

However, as shown in FIGS. 3 and 4 , the heat generated by the heat pump 140 bypasses the heat heater 110 and may be directly transferred to the vaporizer 10, which is a second branch line ( 152) can be achieved.

As described above, the heat pump 140 may be provided for the flow of the heat medium, and may slightly pressurize the heat medium to increase heat exchange efficiency.

However, in the present embodiment, it is illustrated that one heat pump 140 is provided, but two heat pumps 140 are provided to be provided for standby, and two heat pump 140 can be provided in parallel, at least one of which is the main , the other can be used as an auxiliary, various modifications are possible.

This heat pump 140 is provided, for example, on the heat medium line 150, upstream of the second branch line 152, as will be described later, from the heat heat pump 140 to the heat heat heater 110 and/or It may be supplied to the drain cooler 130 and/or the vaporizer 10 .

The heat-heat line 150 is a configuration for supplying heat together with the heat-heat heater 110 and heat-heat pump 140 , and the heat-heat line 150 is returned to the heat-heat pump 140 via the heat-heat heater 110 and the vaporizer 10 . It may be provided to be pulmonary circulation.

That is, the heat-heat line 150 is connected from the heat-heat heater 110 to the vaporizer 10 and supplies heat to the vaporizer 10 . In addition, the heat medium line 150 may be provided in a closed loop form so that the heat medium delivered to the vaporizer 10 can be circulated by the heat medium line 150 , and the heat flow rate can be controlled by a valve to be described later. can

The first branch line 151 is a configuration through which the heat medium passes along with the heat medium line 150 , and is branched from the heat medium line 150 , and the heat flow bypasses the heat medium heater 110 and passes through the drain cooler 130 . It may be provided to be supplied to the vaporizer (10).

For example, the branching point of the first branch line 151 may be provided upstream of the thermal heater 110 , and the merging point of the first branch line 151 may be provided downstream of the thermal heater 110 . . A drain cooler 130 may be provided on the first branch line 151 so that heat energy may pass through the drain cooler 130 .

The second branch line 152 is branched from the heat medium line 150 similarly to the first branch line 151 , and bypasses the heat medium heater 110 and the drain cooler 130 and is supplied to the vaporizer 10 . It can be arranged so that

For example, the branching point of the second branch line 152 is provided upstream of the thermal heater 110 and the drain cooler 130 , and the merging point of the second branch line 152 is the thermal heater 110 and the drain cooler. It may be formed to be provided downstream of (130).

Through this second branch line 152 , the heat fruit may be directly supplied to the vaporizer 10 after bypassing the heat medium heater 110 and the drain cooler 130 , and as mentioned above, the second branch line 152 . ) may be provided upstream of the heat pump 140 and supplied from the heat pump 140 to the heat heat heater 110 and/or the drain cooler 130 and/or the vaporizer 10 .

The heat source line 160 may be provided such that a heat source in a state such as steam is supplied from the heat source generator 120 to the heat source generator 120 via the heat medium heater 110 and the drain cooler 130 .

Accordingly, the heat source (generated by the heat source generating unit 120), at least part of it is changed to condensed water (exchange with heat in the fruit heater 110), and becomes stable condensate by additional cooling (some heat in the drain cooler 130) and heat exchange), and may be changed back to steam in the heat source generating unit 120 .

Here, the heat source line 160 may be provided in the form of a closed loop passing through the heat source generator 120 , the heat medium heater 110 , and the drain cooler 130 .

However, the heat source passing through the heat source line 160 may be in a state in which condensed water is mixed or the entire condensate state in some cases, such as a region passing through the drain cooler 130 .

The valve (not shown) may control the flow rate of the heat medium flowing into the drain cooler 130 according to at least one of heat flow rate, heat medium temperature, heat source flow rate, or heat source temperature, liquefied gas flow rate, and liquefied gas temperature. There is, as an example, by detecting whether the temperature of the heat medium is formed within a preset range, after passing through the heat medium heater 110 and/or the drain cooler 130 or the heat medium heater 110 and/or the drain cooler ( 130) can be controlled to be supplied to the vaporizer 10 after bypassing.

These valves are, for example, a heat sensor (not shown) or a flow sensor (not shown) for measuring the temperature or flow rate of the heat medium line 150, the first branch line 151, the second It may be provided in the branch line 152, it is possible to control the flow rate of the heat medium flowing into the drain cooler 130 or the like through a signal detected from the temperature sensor / flow rate sensor.

Of course, a sensor that measures the temperature or flow rate on the liquefied gas line (not shown) or the heat source line 160 through which the liquefied gas passes so that it can be controlled by the flow rate / temperature of the liquefied gas and / or the flow rate / temperature of the heat source ( (not shown) is provided, and it is also possible to control the flow rate of heat flowing into the drain cooler 130, etc. through a signal sensed from such a sensor, and to be controlled by a combination of flow/temperature of liquefied gas, heat source, and heat. Various modifications are possible as possible.

That is, the valve may allow the heat medium to pass through or bypass the drain cooler 130 according to the temperature of the condensed water coming out of the drain cooler 130 or the temperature of the liquefied gas.

In addition, the identification numbers 161 and 162, which are not described, may be an NG heater and an LNG vaporizer as two heat exchangers.

As such, in this embodiment, it is possible to improve the design and arrangement due to space constraints by omitting the condensate tank and the heat source pump, and to cool the condensate in the drain cooler 130 to suppress flash vapor and stabilize the condensate. .

Although the present invention has been described in detail through specific examples, this is for the purpose of describing the present invention in detail, and the present invention is not limited thereto, and by those of ordinary skill in the art within the technical spirit of the present invention. It will be clear that the transformation or improvement is possible.

All simple modifications and variations of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

10: vaporizer 100: fruit processing system
110: heat heater 120: heat source generating unit
130: drain cooler 140: heat pump
150: fruit line 151: first branch line
151B: pressure control valve 152: second branch line
160: heat source line 160A: condensate line
165: feeding tank 167: main valve
167A: warm-up valve

Claims (6)

A system for supplying fruit to a vaporizer that vaporizes liquefied gas,
a heat source for heating the heat source as a heat source;
a heat source generator for producing the heat source and supplying it to the heat medium heater, and heating the condensed water cooled by the heat medium in the heat medium heater to produce the heat source; and
It is cooled by the heat medium in the heat medium heater and includes a drain cooler for cooling the heat source including at least some liquid phase,
The heat medium heater and the drain cooler are provided in series based on the flow of the heat source,
The heat medium heater and the drain cooler are provided in parallel based on the flow of the heat medium, and the drain cooler reduces the amount of the heat source supplied to the heat medium heater. According to claim 1,
The heat treatment system, characterized in that it further comprises a heat pump for transferring the heat to the heat heater. According to claim 1,
a heat medium line provided so that the heat medium is recovered from the heat medium heater to the vaporizer via the vaporizer and closed circulation;
a first branch line branched from the heat medium line and provided so that the heat medium bypasses the heat medium heater and is supplied to the vaporizer via the drain cooler; and
and a second branch line branched from the heat medium line and provided so that the heat medium is supplied to the vaporizer by bypassing the heat medium heater and the drain cooler. According to claim 1,
and a heat source line provided so that the heat source is supplied from the heat source generator to the heat source generator via the heat heater and the drain cooler. According to claim 1,
Heat treatment, characterized in that it further comprises a valve for controlling the flow rate of the heat medium flowing into the drain cooler according to at least any one of liquefied gas flow rate, liquefied gas temperature, heat medium flow rate, heat medium temperature, heat source flow rate, and heat source temperature system. A ship having the heat treatment system according to any one of claims 1 to 5.

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