JPH08561Y2 - Exhaust Heat Boiler Evaporator - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is directed to a natural circulation type exhaust heat boiler by removing the forced circulation pump from the plumbing pipe of the horizontal hairpin type water pipe type exhaust heat boiler. The present invention relates to a steaming device.

[Conventional technology]

In the structure of a conventional horizontal hairpin type water tube type exhaust heat boiler, as shown in FIG. 3, a forced circulation pump (20) is usually arranged in the pipe of the downcomer pipe (2).

[Problems to solve the invention]

In a conventional horizontal hairpin type water tube type exhaust heat boiler in which a forced circulation pump is installed in the pipe of a downcomer pipe, when the forced circulation pump fails, the boiler cannot operate. Further, there is a problem that power is required to operate the forced circulation pump, so that a consumer demands an exhaust heat boiler without the forced circulation pump.

However, if the water pipe structure of the exhaust heat boiler is left as it is as shown in FIG. 3 and the circulation pump is removed from the exhaust heat boiler shown in FIG. 3, the following inconvenient problems occur.

That is, in FIG. 1, at the time of initial startup, high temperature exhaust gas enters from the exhaust gas inlet duct (17) and heats the horizontal hairpin type water pipe (4) from below, and accordingly, inside the horizontal hairpin type water pipe (4). Although steam bubbles start to be generated in the water pipe (4) in the initial cold state, no subcooling occurs on the inner surface of the water pipe (4) with cold water around the cold state. Even if boiling starts and vapor bubbles are generated, they immediately encounter the surrounding cold water and the bubbles are crushed, so-called water hammer phenomenon occurs and a large impact occurs in the water pipe (4).

On the contrary, when the cold water is gradually heated in the water pipe and becomes close to the saturation temperature, the water hammer as described above does not occur. In addition, an upflow is also generated in the water pipe, and the internal water starts to rise together with the bubbles, and a smooth flow is generated so that the water circulation is normally performed.

The present invention prevents the water hammer in the water pipe at the time of cold initial start-up or cold evaporating as described above, and makes it possible to smoothly circulate and evaporate water. It is an object of the present invention to provide a steaming device effective for steaming.

[Means for solving the problem]

The present invention relates to a natural circulation type horizontal hairpin type water pipe exhaust heat boiler, in which an inner pipe (22) is provided in the header pipe (3) at the inlet of the hairpin type water pipe of the boiler, and the hairpin type of the inner pipe (22) is provided. A nozzle (23) is provided at a portion facing the inlet direction to the water pipe (4), and a three-way valve or a switching valve having the same effect as the three-way valve is provided at the outlet side of the water supply pump (8), and the three-way valve (9). ) Or a switching valve having an effect equivalent to that of the three-way valve (9) and an inner pipe (22) in the header pipe (3) at the hairpin type water pipe inlet are provided by a pipe (21) via a flange (24). The present invention relates to a steam generator for a drainage boiler, which is connected with a header pipe (3). As shown in FIG. 2, the present invention provides an inner pipe (22) inside an inlet pipe (3) of the exhaust heat boiler,
The inner pipe (22) is provided with a nozzle-like branch pipe (nozzle) (23) at each water pipe inlet, and the inner pipe (22) is formed by the pipe (21) together with the header pipe (3) through the flange (24). A three-way valve (9) provided at the outlet of the exhaust heat boiler feed water pump (8) or a switching valve having a similar effect is used as a boiler feed water pump (8).
The steam drum (1) from the boiler feed pump (8) through the economizer (11) from the cold start of the boiler until steam with a predetermined pressure is generated, for example, for about 30 minutes to 1 hour. ), The water in the hairpin type water pipe (4) is pushed through the inner pipe (22) and the nozzle (23) without passing through the economizer (11), and is blown into the water pipe so that the water can be supplied. By activating the three-way valve or the switching valve that has the same effect as the three-way valve, the water in the hairpin type water pipe is circulated upward, the water in the water pipe is heated, and the water inside the water pipe approaches the saturation temperature. The generated bubbles also flow upward and can be steamed without generating water hammer.

At this time, if the water level in the steam drum (1) rises above the normal level, it is necessary to blow it separately. Further, as a switching valve having the same effect as the three-way valve, for example, a two-way valve is used.
There are methods such as combining them individually.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is a schematic sectional view of an embodiment of an exhaust heat boiler equipped with a steam evaporating device of the present invention, and FIG. 2 is an inner pipe (22) provided in a boiler inlet pipe header pipe (3) of the present invention. FIG. 2 is a detailed sectional view of the present invention, and the present invention exerts a remarkable effect particularly as a vaporizing device at the time of initial cold state startup.

In FIG. 1, the exhaust gas enters from the exhaust gas inlet duct (17) and immediately becomes an upward flow to enter the tube group part of the boiler hairpin type water pipe (4), but in this case no equivalent action is taken. As a result, the hairpin type water pipe becomes in the state as described above, bubbles are generated in the water pipe (4), water hammer occurs, and the water pipe is troubled.

Therefore, in the present invention, as a steaming countermeasure at the time of initial startup, an inner pipe (22) is provided in the inlet header pipe (3) of the boiler water pipe, and as shown in FIG. A nozzle-like branch pipe (nozzle) (23) is provided, and a three-way valve (9) provided at the outlet of the boiler feed water pump (8) via a flange (24) or a switching valve having the same effect as this is provided. The boiler feed water pump (8) is connected to the boiler feed water pump (8), and the feed water supplied from the boiler feed water pump (8) is supplied to the three-way valve (9) or similar until steam at a predetermined pressure is generated from the cold start of the boiler. The switching valve having the above effect is switched to the inner pipe (22) and nozzle (23) sides. The water supply from the water supply pump (8) is extruded into the hairpin type water pipe (4) through the nozzle (23), and the water in the hairpin type water pipe is circulated upward, and the internal water is heated to approach the saturation temperature and the hairpin type water is reached. The bubbles generated in the tube are made to flow upward. Therefore, it is possible to safely steam the so-called water hammer without causing it.

[Effect of device]

According to the present invention, since it is not necessary to dispose a forced circulation pump in the plumbing pipe of the conventional exhaust heat boiler, the trouble caused by the failure of the conventional forced circulation pump is completely solved. Further, since the forced circulation pump is not provided, the energy cost for its operation becomes unnecessary. Further, in the present invention, by providing a three-way valve (9) on the outlet side of the water supply pump (8), the boiler water supply pump (8) is provided with a three-way valve (9) through the three-way valve (9). Since the inner pipe (22) in 3) and the pipe (21) from the three-way valve (9) are directly connected, from the cold start of the boiler until steam of a predetermined pressure is generated Allows the water supplied from the water supply pump (8) to flow into the hairpin type water pipe through the pipe (21) from the three-way valve (9) without passing through the economizer (11). The water is circulated from the lower side to the upper side, and the water in the hairpin type water pipe is heated and approaches the saturation temperature, and the bubbles generated in the water pipe also flow upward, during the cold initial steaming of the horizontal hairpin type water pipe type waste heat boiler. A great shocking wow Without generating a hammer, smoothly provide an advantage that it becomes possible to Okoshi蒸, a marked effect especially as an initial cold Okoshi蒸 device at startup. In addition, since a forced circulation pump is not required, it is possible to save energy as compared with the conventional exhaust heat boiler, and to significantly reduce the maintenance and maintenance of the exhaust heat boiler, which is economical and economical in operating the exhaust heat boiler. Is also extremely advantageous.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of an embodiment of an exhaust heat boiler equipped with a steam evaporating device of the present invention, and FIG. 2 is a detailed cross-sectional view of an inner pipe provided in a boiler inlet pipe header of the present invention. The figure shows a schematic cross-sectional view of a horizontal hairpin type water tube type exhaust heat boiler in which a forced circulation pump is arranged in a conventional downcomer pipe. 1 ... Steam drum, 2 ... Precipitation pipe, 3 ... Boiler water pipe inlet pipe alignment, 4 ... Hairpin type water pipe, 7,21 ... Water supply pipe, 8 ... Water supply pump, 9 ... Three-way valve, 11 ... Economizer 17 …… Exhaust gas inlet duct, 18 …… Exhaust gas outlet duct 14 …… Main steam pipe, 20 …… Forced circulation pump 22 …… Inner pipe inside the boiler water pipe inlet 23 …… Nozzle, 24 …… Flange

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Ikuo Tsuchiyama 1-9-36 Oyodokita, Oyodo-ku, Osaka-shi, Osaka Prefecture Hirakawa Iron Works Co., Ltd. (72) Kei Kyoshi, 1 Oyodo-kita, Oyodo-ku, Osaka-shi, Osaka 9-36 Hirakawa Iron Works Co., Ltd. (72) Inventor Masanari Kinoshita 1-9-36 Oyodo Kita, Oyodo-ku, Osaka City, Osaka Prefecture (56) Hirakawa Iron Works Co., Ltd. (56) Reference JP-A-58-106303 (JP, A) Actually developed 60-76706 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. In a natural circulation type hairpin type water pipe waste heat boiler, an inner pipe (22) is provided in a header pipe (3) at an inlet of the hairpin type water pipe of the boiler, and the hairpin type of the inner pipe (22) is provided. A nozzle (23) is provided in a portion facing the inlet direction to the water pipe (4), and a three-way valve (9) or a switching valve having the same effect as the three-way valve (9) is provided on the outlet side of the water supply pump (8) A three-way valve) is provided, and the three-way valve and the inner pipe (22) provided in the header pipe (3) at the hairpin type water pipe inlet are connected by a pipe (21) via a flange (24). , Normally, the three-way valve is configured so that the water supply from the water supply pump (8) is supplied to the steam drum through the economizer (11),
A steam evaporating apparatus for a waste heat boiler, wherein the three-way valve is switched so that water is supplied through a pipe (21) during cold initial steaming or cold steaming.