JPH10103602A - Steam generating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a moisture content amount of secondary steam as much as possible and to supply steam of good quality. SOLUTION: A steam generating device is formed such that an evaporator 2 employing a spiral type heat-exchanger 1 and water supply tank 3 are arranged in juxtaposition. The two devices are communicated together at respective lower parts through coupling pipes 4 and 5 and connected together at respective upper parts through a coupling pipe, and arrangement is effected such that supply water from the water supply tank is circulated by utilizing thermosiphon phenomenon, and in the evaporator 2, steam from a primary steam introduction part 6 is fed as a supply water heating source to one flow passage of the heat-exchanger and heat-exchange is effected through supply of supply water to the other flow passage, and generating secondary steam is extracted from a steam extraction part 7 situated above the water supply tank. A coupling pipe for secondary steam to connect together the evaporator 2 and the water supply tank 3 is arranged above a coupling pipe through which hot water is circulated through utilization of thermosiphon phenomenon.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam generator for generating and extracting secondary steam by exchanging heat between primary steam as a heating source and water supplied to an evaporator.

[0002]

2. Description of the Related Art Conventionally, an evaporator 2 using a spiral heat exchanger 1 and a water supply tank 3 are provided side by side, and a lower part of both is connected by a connecting pipe 4 and an upper part thereof is connected by a connecting pipe 5. In the evaporator 2, steam as a heating source is supplied from the primary steam introduction unit 6 to one flow path of the spiral heat exchanger 1. The water is discharged as drain and the other flow path is supplied with water from the water supply tank 3 to exchange heat, and the generated secondary steam passes through the connecting pipe 5 and is taken out from the steam take-out section 7 above the water supply tank 3. Steam generators configured as such are known.

[0003]

However, the steam generated by the heat exchange by the spiral heat exchanger 1 generates the same connecting pipe 5 as the hot water circulated by the thermosiphon phenomenon.
And is taken out from the steam take-out part 7 of the water supply tank 3 through the water supply tank 3, so that it becomes secondary steam containing a large amount of water entrained, resulting in energy loss and corrosion of the connected steam pipe. There is a point.

As one of the measures, a method of shifting the position of the connecting pipe 5 upward from the liquid level has been proposed. However, the apparatus becomes large and the circulation of hot water becomes difficult. There were problems that the exchange efficiency was lowered and that scale was easily attached. The object of the present invention is to solve the above problems,
A connecting pipe dedicated to secondary steam is provided in addition to a connecting pipe that circulates hot water using the thermosiphon phenomenon, so that it can be separated from the hot water circulating pipe and at a distance from the evaporation surface. An object of the present invention is to provide a steam generator in which the amount of water in the next steam is minimized.

[0005]

In order to achieve the above object, in the first invention, an evaporator using a spiral heat exchanger and a water supply tank are arranged side by side, and the two are communicated by a connecting pipe at a lower portion. The upper part is connected by a connecting pipe so as to circulate water supplied from a water supply tank by utilizing a thermosiphon phenomenon. In an evaporator, steam is supplied from a primary steam inlet as one of the heat exchangers as a water supply heating source to one of the heat exchangers. In a steam generator in which the supply water is supplied to the flow path and the supply water is supplied to the other flow path to perform heat exchange, and the generated secondary steam is taken out from the steam take-out part above the water supply tank, the thermosiphon phenomenon is caused. A steam generator was provided with a secondary steam connecting pipe connecting the evaporator and the water supply tank above the connecting pipe through which hot water was circulated by utilizing.

According to a second aspect of the present invention, there is provided a steam generator in which a baffle is provided on an evaporator side of a secondary steam connecting pipe. In the third invention, a steam generator is provided in which the secondary steam connecting pipe is tangentially mounted on the water supply tank side. (Function) In the first invention, a secondary steam connection pipe is provided above the connection pipe through which the hot water circulates by utilizing a thermosiphon phenomenon, and a secondary steam having a reduced water content is provided by using a secondary steam connection pipe. Can be taken out through the connecting pipe.

In the second aspect of the present invention, a baffle is provided on the evaporator side of the secondary steam connecting pipe to block moisture from splashes caused by evaporation, so that secondary steam having a small moisture content can be more reliably taken out. . In the third aspect of the invention, the secondary steam connection pipe is tangentially mounted above the water supply tank, so that the entrainment amount as a spiral flow can be further reduced.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, an evaporator using a spiral heat exchanger and a water supply tank are arranged side by side, and both are connected by a connecting pipe at a lower part, and both are connected by a connecting pipe at an upper part. Provided to circulate the feedwater from the feedwater tank using the thermosiphon phenomenon, and in the evaporator, supply steam from the primary steam introduction unit to one flow path of the heat exchanger as a feedwater heating source, and to the other flow path In the steam generator which supplies the feed water and exchanges heat, and the generated secondary steam is taken out from the steam take-out part above the feed water tank, the hot water is circulated using the thermosiphon phenomenon. A steam generator was provided with a secondary steam connecting pipe connecting the evaporator and the water supply tank above the connecting pipe.

Further, since a connecting pipe for secondary steam is provided above the connecting pipe through which the hot water circulates by utilizing the thermosiphon phenomenon, the water accompanying the splash generated by heat exchange is sufficiently removed. In this state, the secondary steam can be taken out from the steam take-out section. In addition, as an embodiment, a baffle is provided on the evaporator side of the secondary steam connecting pipe, the connecting pipe is tangentially mounted on the water supply tank side, and a baffle or demister for removing droplets is provided below the steam extracting section. Or inside the connecting pipe.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments shown in the drawings will be described below. FIG.
Are the same as in the conventional example. Reference numeral 8 denotes a connecting pipe, which is provided above the connecting pipe 5 provided to utilize the thermosiphon phenomenon. Therefore, even if the water supplied by the spiral heat exchanger 1 becomes hot water and splashes, steam with a small amount of water passes through the upper connecting pipe 8 and rises, and is higher in quality than the steam extracting section 7. Removed as steam. Because the amount of entrainment is small, scale adheres to piping,
Corrosion can be prevented.

Reference numeral 9 denotes a baffle, which is provided on the side of the evaporator 2 of the connecting pipe 8 so that splashes during evaporation can be more reliably prevented from entering the connecting pipe 8. In FIG. 2, by connecting the connecting pipe 8 in the tangential direction on the water supply tank 3 side,
The water content can be removed more in the water supply tank.

[0012]

According to the first aspect of the present invention, since the connecting pipe provided at the upper part can provide secondary steam from which the amount of splashed water has been removed, the quality can be improved, and the scale can adhere to the pipe or corrode. Can also be prevented. According to the second aspect, the baffle can prevent moisture from entering the connection pipe for the secondary steam, and can further improve the quality of the steam.

In the third aspect of the present invention, it is possible to further remove water at the secondary steam outlet.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a device of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view of a main part showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spiral heat exchanger 2 Evaporator 3 Water tank 4, 5 Connecting pipe 6 Steam introduction part 7 Steam extraction part 8 Connecting pipe 9 Baffle

Claims (3)

[Claims] 1. An evaporator using a spiral heat exchanger and a water supply tank are provided side by side, and both are connected by a connecting pipe at a lower part, and both are connected by a connecting pipe at an upper part, and the water is supplied from the water supply tank. The feedwater is provided so as to circulate using the thermosiphon phenomenon.In the evaporator, steam is supplied from a primary steam introduction unit to one flow path of the heat exchanger as a feedwater heating source, and the feedwater is supplied to the other flow path. In a steam generator in which secondary steam generated by heat exchange is extracted from a steam extraction section above a water supply tank, an upper portion of a connection pipe through which hot water circulates using a thermosiphon phenomenon. A steam generator characterized in that a secondary steam connecting pipe for connecting an evaporator and a water supply tank is provided. 2. The steam generator according to claim 1, wherein a baffle is provided on an evaporator side of the secondary steam connecting pipe. 3. The steam generator according to claim 1, wherein the secondary steam connecting pipe is tangentially mounted on the water supply tank side.