JPH0633863B2 - Open rack type vaporizer with underwater burner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement of a watering system of an open rack type vaporizer, and relates to a circulating water storage tank, an underwater burner tank for heating seawater,
The present invention relates to an open rack type vaporizer with a submersible burner that does not require a high load and an emergency standby machine by providing a circulation system water passage consisting of a mixing tank for raising a temperature to a predetermined temperature and a circulation pump to a sprinkler.

BACKGROUND ART As a device for vaporizing liquefied natural gas (hereinafter referred to as LNG), an open rack type vaporizer (hereinafter referred to as ORV) is often used. As shown in FIG. 6, the ORV has, for example, a large number of finned tubes and a pair of upper and lower header tanks (1).
A heat exchanger panel (3) arranged in parallel in (2) is equipped with a sprinkler (4) for flowing down seawater as a heat medium from the upper part to the lower part, and a pump for pumping seawater to sprinkle the seawater (4). It is configured to send water to and heats LNG rising in the heat exchange panel (3) and seawater to vaporize it.

When designing an ORV that uses seawater as a heat source, the LNG load of 100
%, The seawater temperature is designed under a minimum condition, and the amount of seawater to be sprayed to the heat exchange panel is controlled so that the necessary amount is constantly controlled regardless of the design conditions.

Therefore, if the seawater temperature falls below the design value, the capacity will decrease, so that the heat of LNG flowing in the water tank (6) can be used as shown in Fig. 7 during peak load when the gas supply amount is maximum or during an emergency. A submerged combustion vaporizer called so-called submerged vaporizer (SMV), which has a built-in exchange coil (8) and is vaporized by the combustion heat of the submerged burner (7), is installed as a standby unit. It was common to do.

Problems with the conventional technology Conventional ORVs have the problems of increased construction cost and large installation space due to the installation of the above-mentioned standby machine. During operation, excess water was supplied, resulting in wasted operating costs.

Because of this problem, the ORV has a higher operating cost than the configuration that uses a spare machine that requires a large amount of cost and space for installation in order to secure capacity during temporary peak loads such as during peak demand and at low seawater temperatures. There is a strong demand for a configuration that does not require a large installation space even if the number of devices increases.

Also, during normal operation, it is possible to supply an amount of water that is commensurate with the LNG load and seawater temperature, and reduce the amount of electricity used.
Is coveted.

SUMMARY OF THE INVENTION In view of the present situation, the present invention is an ORV that does not require an SMV of a standby machine, can easily cope with a temporary peak load, and can supply seawater of optimum temperature and amount during normal operation. The purpose is to provide.

SUMMARY OF THE INVENTIONThe present invention is an open rack type vaporizer that evaporates heat exchange with seawater sprinkling LNG rising in a heat exchange panel from a water sprinkler, in which pumped seawater and seawater after being sprinkled on the heat exchange panel are used. A water storage tank that stores water and has a drainage system, a burner tank that is equipped with an underwater burner to heat seawater, and a mixing tank that mixes high-temperature seawater from the burner tank and seawater from the water storage tank to raise the temperature to a predetermined temperature. , A seawater circulation system having flow control means for distributing the seawater from the water storage tank to the burner tank and the mixing tank and flowing it down, and a pump tank equipped with a circulation pump for sending the seawater from the mixing tank to the sprinkler. It is an open rack type vaporizer with an underwater burner characterized by having a water channel.

Configuration of the Invention The open rack type vaporizer with an underwater burner according to the present invention is characterized by the following configurations.

During temporary peak loads and low seawater temperatures, an underwater burner is used to raise the seawater temperature to the required temperature to ensure capacity, and the spare SMV is unnecessary.

On the other hand, if the temperature of the pumped seawater is higher than the required temperature,
A part of seawater as a heat carrier is circulated using a circulation pump. At the time of recycling, the temperature of seawater after being sprinkled on the heat exchange panel and after heat exchange is detected, the temperature is mixed with the pumped seawater to raise the temperature to a predetermined temperature, and then a required amount is supplied.

Further, the seawater temperature before heat exchange can be controlled to be constant based on the seawater temperature.

By burning the acidification of seawater due to the use of an underwater burner in a burner tank of a relatively small volume, the water temperature is maintained at a high temperature and the dissolution of combustion gas in seawater is reduced.

In the circulation system water channel, the amount of water supplemented by a pump and the water generated by the combustion of an underwater burner increases, and the water level of each tank in the system rises.However, a pump tank for storing and sending seawater at the required temperature is used. Depending on the water level, water is drained from the water tank or overflowed from the water tank, so that the heated seawater is not drained, and the amount of seawater and heat in the circulation system are controlled to a predetermined amount.

Further, in the present invention, the flow rate control means for distributing the seawater from the water storage tank to the burner tank and the mixing tank and flowing it down is configured to use a pump and a three-way valve, and is also a water tank arrangement having a head drop structure, The amount of flow distribution to the burner tank and the mixing tank can be controlled by combining a slide weir provided on the downstream side of the water storage tank, an underwater weir provided at the water storage tank, or a floating weir.

In the present invention, the high temperature seawater in the burner tank and the low temperature seawater bypassed from the water storage tank are mixed to a predetermined temperature in the mixing tank, but the seawater can be mixed to a predetermined temperature in the pump tank for circulating water to the sprinkler. In this case, this mixing tank may be omitted.

Disclosure Based on Drawings of the Invention FIG. 1 is an explanatory view of a water tank and a pipeline showing the entire configuration of an open rack type vaporizer with an underwater burner according to the present invention.

FIG. 2 is a perspective explanatory view showing the configuration of each tank such as a water tank of the open rack type vaporizer with a submersible burner according to the present invention. FIG. 3 is a vertical cross-sectional explanatory view of the water storage tank and the slide weir showing the difference in head of overflow water in FIG.

4 and 5 are longitudinal explanatory views showing various configurations of the water storage tank and the flow-down flow rate control means.

The water tank (10) of the open rack type vaporizer with a submersible burner shown in Fig. 1 is arranged below the heat exchange panel (3), and overflows from the sprinkler (4) into the heat exchange panel (3). The seawater, which has fallen in temperature while falling, is received and stored, and a drain port is provided at the bottom thereof and a drain control valve (11) is provided.

Further, seawater supplied from the pumping pump (5) is also stored in the water storage tank (10). In addition, this seawater supply during normal operation,
It is supplied from the drain to a position where it is not drained.

A burner tank (13) provided with an underwater burner (12) is provided adjacent to this water storage tank (10), and further a burner tank (13)
A mixing tank (14) into which the overflow water flows is provided on the downstream side.

The overflow water from the mixing tank (14) enters the pump tank (15) on the downstream side and is then sent to the sprinkler (4) by the circulation pump (16).

The cold seawater that has fallen from the heat exchange panel (3) to the water storage tank (10) is heated by the seawater newly taken in by the pumping pump (5).

The inflow amount from the pumping pump (5) is controlled by the controller (20) for detecting the temperature of the falling seawater according to the temperature of the falling seawater via the valve (21), and the controller (20). Underwater burner
It also controls the opening and closing of the combustion control valve (22) of (12). Reference numeral 23 in the figure is a blower for the underwater burner (12).

The seawater in the water storage tank (10) is passed through a burner tank (13) and a mixing tank (14) via a three-way valve (17) that is controlled to open and close by a controller (19) that detects the seawater temperature in the burner tank (13). ), And the required amount is pumped. In addition, cold seawater that exceeds the storage amount is discharged from the drain port at the bottom of the tank.

The drainage control valve (11) is controlled to open / close according to the water surface level by a detector (18) that detects the water surface level of the pump tank (15).

In the above configuration, the seawater temperature after heat exchange is detected and controlled to be constant, so that the load of the pumping pump (5) is only the amount of heat necessary for the required vaporization, and the amount of power for pump power can be reduced.

Further, the distribution of seawater from the water storage tank (10) is performed by arranging the tanks in a head drop manner described below, but a method using a distribution pump may be used.

The water tank shown in FIG. 2 is provided with a movable slide weir (30) at the upper end of one wall of the water storage tank (10), and overflow water from both sides of the slide weir (30) is adjacent to the burner tank (13). ), The height of each tank wall is adjusted so that it flows into the mixing tank (14) and further into the mixing tank (14) from the burner tank (13), and finally the pump is pumped from the mixing tank (14). It is configured to flow into the tank (15).

The slide weir (30) distributes the seawater from the water storage tank (10) to the burner tank (13) and the mixing tank (14) and allows it to flow down, and controls the flow rate to each tank by the slide position. You can

Further, the water tank (10) has a slide weir (3
The water surface can be made constant by appropriately selecting the height of the wall provided with (0) and the height of the other wall at the opposite position. In other words, (h _B -h _o)
When is selected as an appropriate value, the amount of water flowing into the burner tank (13) and the mixing tank (14) becomes almost constant, and excess seawater overflows from the other wall and is discharged.

As a means for stabilizing the flow rate, as shown in FIG. 4, an underwater weir (31) can be provided in the water storage tank (10), which is highly stable against changes in the liquid level and can be used from the water storage tank (10) to the burner tank. (13)
And the amount of water flowing into the mixing tank (14) becomes more stable.

Further, in FIG. 4, the underwater weir (31) may be slid.

Further, as shown in FIG. 5, the water storage tank (10) is divided into two parts by a partition wall (32), and a pair of floats (33) and a weir held by the float (33) are provided upstream of the partition wall (32). By providing the float type weir consisting of 34), the float type weir moves according to the water surface of the main water storage tank (10), h _B becomes constant regardless of the absolute level of the water surface, and the flow rate becomes constant.

In addition, the float type weir slides without a partition wall (3
It can be placed just before (0).

Effects of the Invention The open rack type vaporizer with a submersible burner according to the present invention has the following effects.

It can cope with temporary overload and low seawater temperature, does not require the SMV of the standby machine, and can reduce the installation space.

Since the seawater temperature after heat exchange is detected and controlled constantly, the load on the circulation pump is limited to the amount of heat required for the required vaporization, and the amount of power for pump power can be reduced.

In addition, other than the method of controlling the seawater temperature after heat exchange to be constant,
The seawater temperature in the pump tank can be controlled to be constant, and similarly, the amount of power for pump power can be reduced.

When the seawater delivery system fails, it can be operated only by the underwater burner and the circulating seawater system.

Circulating seawater when using an underwater burner is split into a burner tank and a tank that bypasses it, and then combined and mixed to reach the required temperature, so acidification of water can be prevented without excessive heating, which saves energy and equipment. Corrosion protection can be achieved.

[Brief description of drawings]

FIG. 1 is an explanatory view of a water tank and a pipeline showing the overall configuration of an open rack type vaporizer with an underwater burner according to the present invention. FIG. 2 is a perspective explanatory view showing the configuration of each tank such as a water tank of the open rack type vaporizer with a submersible burner according to the present invention. FIG. 3 is a vertical cross-sectional explanatory view of the water storage tank and the slide weir showing the difference in head of overflow water in FIG. 4 and 5 are longitudinal explanatory views showing various configurations of the water storage tank and the flow-down flow rate control means. FIG. 6 is an explanatory diagram showing the configuration of a conventional open rack type vaporizer, and FIG. 7 is an explanatory diagram showing the configuration of a submerged vaporizer to be installed side by side. 1,2 …… Header tank, 3 …… Heat exchange panel, 4 ……
Sprinkler, 5 ... Pumping pump, 10 ... Water tank, 11 ... Drainage control valve, 12 ... Underwater burner, 13 ... Burner tank, 14 ...
… Mixing tank, 15 …… Pump tank, 16 …… Circulation pump, 17 ……
Three-way valve, 18 ... Detector, 19,20 ... Controller, 21 ... Valve, 22 ... Fuel control valve, 23 ... Blower.

Front page continuation (72) Kensuke Koike 3-4 Fukuodai, Sodegaura-cho, Kimitsu-gun, Chiba Prefecture Minoru Nishiki Minoru 48 Sasage, Futtsu-shi, Chiba Prefecture (72) Yoji Sato Nishi-Nagamoto-dori, Amagasaki-shi, Hyogo Prefecture 2-6, Sumitomo Precision Industries Ltd. (72) Inventor, Hitonobu Shoya 2-6, Nishi-Nagasuhondori, Amagasaki City, Hyogo Prefecture Sumitomo Precision Industries Ltd.

Claims (2)

[Claims] 1. An open rack type vaporizer for heat-vaporizing and liquefying liquefied natural gas rising in a heat exchange panel with seawater sprinkled from a sprinkler, wherein the pumped seawater and the sprinkled seawater are heat-exchanged on the heat exchange panel. A water storage tank that stores water and has a drainage system, a burner tank that is provided with an underwater burner to heat seawater, and a mixing tank that mixes high-temperature seawater from the burner tank and seawater from the water storage tank and raises the temperature to a predetermined temperature. , A seawater circulation system having a flow rate control means for distributing the seawater from the water storage tank to the burner tank and the mixing tank and flowing it down, and a pump tank provided with a circulation pump for sending the seawater from the mixing tank to the sprinkler An open rack type vaporizer with an underwater burner, which is equipped with a water channel. 2. Sea water from a water tank is used as a burner tank and / or
Or, it flows down to the mixing tank and the pump tank one by one with a head difference,
The open rack type vaporizer with an underwater burner according to claim 1, characterized in that unnecessary seawater overflows from the water storage tank.