JPS5980600A - Nitrogen gas enclosing device - Google Patents

Abstract

PURPOSE:To prevent gas temperature from drop due to drop of the atmospheric temperature or the like in the beginning of use or during use to ensure the supply of nitrogen gas of at least 10 deg.C by arranging a water flow nozzle on the upper portion of a gasifying and heating sections to controllably open and close an automatic valve with electric signals obtained from exit temperature. CONSTITUTION:On the upper portions of a fine tube of gasifying and heating sections of a carbureter is installed a water flow nozzle 16, and a water pipe 17 communicating to this nozzle is connected to a water source through a controlling valve 18. The controlling valve obtains signals from a temperature regulator provided on an exit header 8 of gas for control. That is, in operation, it flows water from the upper portion of the fin tube according to the signal obtained from a gas temperature exit in the reduction of the atmospheric temperature to extinguish frost on the surface of the fin tube and obtain heat from water flow in the heating section so that gas is produced continuously stably even in the // coldest season and exit temperature can be maintained at least -10 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a nitrogen gas filling device used in thermal power generation equipment using a liquefied nitrogen low-temperature storage tank method.

[Prior art]

Conventional nitrogen gas filling devices for power generation equipment have generally been of the high-pressure gas cylinder type. On the other hand, the present invention
Although liquefied nitrogen low-temperature storage tank type systems have come into use in recent years, liquefied nitrogen low-temperature storage tank type nitrogen gas supply equipment has originally been widely used for bar sinks in chemical plants and other applications.

However, these methods reduce the nitrogen gas to the desired pressure,
The main focus was on supply, and there was no temperature control. For this reason, even in the cylinder method, there is a drop in gas temperature due to depressurization, and the side receiving the gas supply has peace of mind that consideration should be given to damage caused by low-temperature brittleness, low-temperature thermal shock, and the like. However, this problem also occurs in the liquefied nitrogen low-temperature storage tank system, in which liquefied nitrogen around -196U is gasified through a vaporizer, and the gas is depressurized and sent directly.

In other words, it is difficult for liquefied nitrogen of -19611' to gasify through a vaporizer and then reach atmospheric temperature through a heating section.Especially in severe cold, due to the heat absorbed by vaporization, J9 questions 2 to 10 are difficult to reach. As a result, the heat exchange of the fin duplex in both the vaporization section and the heating section is significantly hindered.
The gas outlet temperature will be below -IOC. This temperature exceeds the operational limit temperature of commonly used piping materials and high-pressure vessels, and is unfavorable in terms of low-temperature brittleness and low-temperature thermal shock, which shortens the lifespan. Depending on the Nyoki, there was a drawback that it became impossible to drive.

That is, as shown in FIG. 1, the gas flowing from the liquefied cryogenic storage tank 2 through the conduit 3 into the vaporizer 4 absorbs heat in the air through the fin tube 10, and transfers the heat to liquid nitrogen. It gains latent heat of vaporization and evaporates to become nitrogen gas. This gas passes through the heating section 5 in the latter stage, where it similarly absorbs the heat of the outside air with the fin tube, and the temperature gradually rises from the evaporation point of about -160C to the pressure reducing device installed at the outlet of the vaporizer. It communicates with the regulating valve 6 and with the outlet header 8 . A signal of this header outlet pressure is transmitted to a regulating valve 6 by a pressure regulator 7 provided in the header, and gas is supplied at a constant pressure.

The fin tube 10 of this conventional equipment has a sheath 11 as shown in FIG. 2 during cold weather. Since this sheath 11 contains a sufficient air layer, heat conduction is almost cut off, and furthermore,
As the gas continues to be released, the range of target 6 will expand, and the gas temperature will eventually fall below the operating limit temperature of the monthly charge by 1 OCf. This gas is introduced through conduit 12 to the equipment 13 and 14 of the power plant, as shown on the third side.

[Purpose of the invention]

An object of the present invention is to provide a nitrogen side inlet gas supply device that can supply nitrogen gas to a plant in a sufficiently safe manner even during the severe cold of winter.

[Summary of the invention]

In the nitrogen gas supply equipment for the low-temperature storage tank system for liquefied nitrogen, since the liquefied gas vaporizes with endothermic absorption, a number of fin tubes are arranged in parallel, and they are collected and fed through a single fin tube. A structure that heats the outlet gas is generally used.

In this conventional method, the heating medium of the fin tube is the outside air, and it is an air-heated type.1, This/Hime, has the disadvantage that frost forms during severe cold weather in cold regions, and after frost formation, The heating effect is also drastically reduced, and when the outside air temperature is below 110C, even lower temperature gas is supplied.

In the present invention, a running water nozzle is arranged above the vaporizing part and the heating part of a vaporizer, an automatic valve is arranged in the middle of the piping connected to this, and the opening and closing of this valve is controlled by an electric signal obtained from the gas outlet temperature. controlled by. If the outside air temperature decreases at the beginning of use or during use, the gas temperature decreases during use due to frosting, or low-temperature gas in severe cold, the gas is preheated to a temperature close to the water temperature of -10111' or higher, and nitrogen gas of -10111' or higher is used. supply will be ensured.

[Embodiments of the invention]

An embodiment of the present invention will be explained with reference to FIG.

The structure of the gas supply equipment using the liquefied nitrogen low temperature storage tank system of the present invention will be explained with reference to FIG.

That is, the running water nozzle 1 is installed at the top of the fin tube of the vaporizing section of the vaporizer, and similarly at the top of the fin tube of the heating section of the vaporizer.
6 is installed, and a water pipe 17 that connects to this nozzle is connected to a water source via a control valve 18.

This control valve is controlled by receiving a signal from the temperature adjustment side provided on the ladder 8 to the gas outlet.

〔Effect of the invention〕

With this gas supply equipment for power generation equipment, during operation, a signal obtained from the gas temperature outlet due to a drop in outside air temperature causes water to flow from the top of the fin tube to eliminate frost on the surface of the fin tube. By obtaining heat from running water in the warm part, it continues to generate gas stably even in severe cold when the outside air is about -10C, and the outlet temperature can be raised to -10tl? It can be kept as follows.

[Brief explanation of the drawing]

FIG. 1 is a conventional system diagram, FIG. 2 is a fin tube, and FIG. 4 is a system diagram of the present invention. 16...Flowing water nozzle, 17...Water pipe, 18 Control valve. Agent Patent Attorney Akio Takahashi

Claims (1)

[Claims] 1. In the nitrogen gas system, a water heater, a vaporizer, and a heat exchanger placed downstream of the vaporizer,
A nitrogen gas filling device characterized in that a water sprinkling nozzle is disposed above the heat exchanger, and a means for sprinkling heating water using an automatic valve is provided.